Adding upstream version 7.94+git20230807.3be01efb1+dfsg.upstream/7.94+git20230807.3be01efb1+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

39 files changed, 17390 insertions, 0 deletions

diff --git a/nsock/src/Makefile.in b/nsock/src/Makefile.in
new file mode 100644
index 0000000..569d999
--- /dev/null
+++ b/nsock/src/Makefile.in
@@ -0,0 +1,97 @@
+NSOCK_VERSION = 0.02
+prefix = @prefix@
+exec_prefix = @exec_prefix@
+bindir = @bindir@
+sbindir = @sbindir@
+mandir = @mandir@
+srcdir = @srcdir@
+datarootdir = @datarootdir@
+
+CC = @CC@
+AR = ar
+RANLIB = @RANLIB@
+CCOPT =
+DEFS = @DEFS@ -DNSOCK_VERSION=\"$(NSOCK_VERSION)\"
+# With GCC, add extra security checks to source code.
+DEFS += -D_FORTIFY_SOURCE=2
+INCLS = -I../include
+CFLAGS = @CFLAGS@ $(CCOPT)
+# CFLAGS = -g -Wall $(DEFS) $(INCLS)
+CPPFLAGS = @CPPFLAGS@ $(DEFS) $(INCLS)
+STATIC =
+SHTOOL = ./shtool
+INSTALL = $(SHTOOL) install
+MAKEDEPEND = @MAKEDEPEND@
+RPMTDIR=$(HOME)/rpmdir
+NBASEDIR=@NBASEDIR@
+NSOCKTESTDIR=@NSOCKTESTDIR@
+
+TARGET = libnsock.a
+
+SRCS = 	error.c filespace.c gh_heap.c nsock_connect.c nsock_core.c \
+	nsock_iod.c nsock_read.c nsock_timers.c nsock_write.c \
+	nsock_ssl.c nsock_event.c nsock_pool.c netutils.c nsock_pcap.c \
+	nsock_engines.c engine_select.c engine_epoll.c engine_kqueue.c \
+	engine_poll.c nsock_proxy.c nsock_log.c proxy_http.c proxy_socks4.c
+
+OBJS =	error.o filespace.o gh_heap.o nsock_connect.o nsock_core.o \
+	nsock_iod.o nsock_read.o nsock_timers.o nsock_write.o \
+	nsock_ssl.o nsock_event.o nsock_pool.o netutils.o nsock_pcap.o \
+	nsock_engines.o engine_select.o engine_epoll.o engine_kqueue.o \
+	engine_poll.o nsock_proxy.o nsock_log.o proxy_http.o proxy_socks4.o
+
+DEPS =	error.h filespace.h gh_list.h nsock_internal.h netutils.h nsock_pcap.h \
+	nsock_log.h nsock_proxy.h gh_heap.h ../include/nsock.h \
+	$(NBASEDIR)/libnbase.a
+
+.c.o:
+	$(CC) -c $(CPPFLAGS) $(CFLAGS) $< -o $@
+
+all: $(TARGET)
+
+$(TARGET): $(DEPS) $(OBJS)
+	rm -f $@
+	$(AR) cr $@ $(OBJS)
+	$(RANLIB) $@
+
+$(NBASEDIR)/libnbase.a: $(NBASEDIR)/Makefile
+	cd $(NBASEDIR) && $(MAKE)
+
+clean-test:
+	cd $(NSOCKTESTDIR) && $(MAKE) clean
+
+clean: clean-test
+	rm -f $(OBJS) $(TARGET)
+
+distclean: clean
+	rm -f Makefile makefile.dep config.log config.status ../include/nsock_config.h $(NSOCKTESTDIR)/Makefile
+
+depend:
+	$(MAKEDEPEND) $(INCLS) -s "# DO NOT DELETE" -- $(DEFS) -- $(SRCS)
+
+check:
+	cd $(NSOCKTESTDIR) && $(MAKE) && ./run_tests.sh
+
+${srcdir}/configure: configure.ac
+	cd ${srcdir} && autoconf
+
+# autoheader might not change config.h.in, so touch a stamp file.
+${srcdir}/config.h.in: stamp-h.in
+${srcdir}/stamp-h.in: configure.ac acconfig.h \
+	config.h.top config.h.bot
+	cd ${srcdir} && autoheader
+	echo timestamp > ${srcdir}/stamp-h.in
+
+config.h: stamp-h
+stamp-h: config.h.in config.status
+	./config.status
+
+Makefile: Makefile.in config.status
+	./config.status
+
+config.status: configure
+	./config.status --recheck
+
+makefile.dep:
+	$(CC) -MM $(CPPFLAGS) $(SRCS) > $@
+-include makefile.dep
diff --git a/nsock/src/acinclude.m4 b/nsock/src/acinclude.m4
new file mode 100644
index 0000000..fc09664
--- /dev/null
+++ b/nsock/src/acinclude.m4
@@ -0,0 +1,119 @@
+# ===========================================================================
+#       http://www.gnu.org/software/autoconf-archive/ax_have_epoll.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_HAVE_EPOLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+#   AX_HAVE_EPOLL_PWAIT([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+#
+# DESCRIPTION
+#
+#   This macro determines whether the system supports the epoll I/O event
+#   interface. A neat usage example would be:
+#
+#     AX_HAVE_EPOLL(
+#       [AX_CONFIG_FEATURE_ENABLE(epoll)],
+#       [AX_CONFIG_FEATURE_DISABLE(epoll)])
+#     AX_CONFIG_FEATURE(
+#       [epoll], [This platform supports epoll(7)],
+#       [HAVE_EPOLL], [This platform supports epoll(7).])
+#
+#   The epoll interface was added to the Linux kernel in version 2.5.45, and
+#   the macro verifies that a kernel newer than this is installed. This
+#   check is somewhat unreliable if <linux/version.h> doesn't match the
+#   running kernel, but it is necessary regardless, because glibc comes with
+#   stubs for the epoll_create(), epoll_wait(), etc. that allow programs to
+#   compile and link even if the kernel is too old; the problem would then
+#   be detected only at runtime.
+#
+#   Linux kernel version 2.6.19 adds the epoll_pwait() call in addition to
+#   epoll_wait(). The availability of that function can be tested with the
+#   second macro. Generally speaking, it is safe to assume that
+#   AX_HAVE_EPOLL would succeed if AX_HAVE_EPOLL_PWAIT has, but not the
+#   other way round.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Peter Simons <simons@cryp.to>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 10
+
+AC_DEFUN([AX_HAVE_EPOLL], [dnl
+  ax_have_epoll_cppflags="${CPPFLAGS}"
+  AC_CHECK_HEADER([linux/version.h], [CPPFLAGS="${CPPFLAGS} -DHAVE_LINUX_VERSION_H"])
+  AC_MSG_CHECKING([for Linux epoll(7) interface])
+  AC_CACHE_VAL([ax_cv_have_epoll], [dnl
+    AC_LINK_IFELSE([dnl
+      AC_LANG_PROGRAM([dnl
+#include <sys/epoll.h>
+#ifdef HAVE_LINUX_VERSION_H
+#  include <linux/version.h>
+#  if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,45)
+#    error linux kernel version is too old to have epoll
+#  endif
+#endif
+], [dnl
+int fd, rc;
+struct epoll_event ev;
+fd = epoll_create(128);
+rc = epoll_wait(fd, &ev, 1, 0);])],
+      [ax_cv_have_epoll=yes],
+      [ax_cv_have_epoll=no])])
+  CPPFLAGS="${ax_have_epoll_cppflags}"
+  AS_IF([test "${ax_cv_have_epoll}" = "yes"],
+    [AC_MSG_RESULT([yes])
+$1],[AC_MSG_RESULT([no])
+$2])
+])dnl
+
+AC_DEFUN([AX_HAVE_EPOLL_PWAIT], [dnl
+  ax_have_epoll_cppflags="${CPPFLAGS}"
+  AC_CHECK_HEADER([linux/version.h],
+    [CPPFLAGS="${CPPFLAGS} -DHAVE_LINUX_VERSION_H"])
+  AC_MSG_CHECKING([for Linux epoll(7) interface with signals extension])
+  AC_CACHE_VAL([ax_cv_have_epoll_pwait], [dnl
+    AC_LINK_IFELSE([dnl
+      AC_LANG_PROGRAM([dnl
+#ifdef HAVE_LINUX_VERSION_H
+#  include <linux/version.h>
+#  if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+#    error linux kernel version is too old to have epoll_pwait
+#  endif
+#endif
+#include <sys/epoll.h>
+#include <signal.h>
+], [dnl
+int fd, rc;
+struct epoll_event ev;
+fd = epoll_create(128);
+rc = epoll_wait(fd, &ev, 1, 0);
+rc = epoll_pwait(fd, &ev, 1, 0, (sigset_t const *)(0));])],
+      [ax_cv_have_epoll_pwait=yes],
+      [ax_cv_have_epoll_pwait=no])])
+  CPPFLAGS="${ax_have_epoll_cppflags}"
+  AS_IF([test "${ax_cv_have_epoll_pwait}" = "yes"],
+    [AC_MSG_RESULT([yes])
+$1],[AC_MSG_RESULT([no])
+$2])
+])dnl
+
+AC_DEFUN([AX_HAVE_POLL], [dnl
+  AC_MSG_CHECKING([for poll(2)])
+  AC_CACHE_VAL([ax_cv_have_poll], [dnl
+    AC_LINK_IFELSE([dnl
+      AC_LANG_PROGRAM(
+        [#include <poll.h>],
+        [int rc; rc = poll((struct pollfd *)(0), 0, 0);])],
+      [ax_cv_have_poll=yes],
+      [ax_cv_have_poll=no])])
+  AS_IF([test "${ax_cv_have_poll}" = "yes"],
+    [AC_MSG_RESULT([yes])
+$1],[AC_MSG_RESULT([no])
+$2])
+])dnl
diff --git a/nsock/src/aclocal.m4 b/nsock/src/aclocal.m4
new file mode 100644
index 0000000..e798741
--- /dev/null
+++ b/nsock/src/aclocal.m4
@@ -0,0 +1,15 @@
+# generated automatically by aclocal 1.11.6 -*- Autoconf -*-
+
+# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+# 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation,
+# Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+m4_include([acinclude.m4])
diff --git a/nsock/src/configure b/nsock/src/configure
new file mode 100755
index 0000000..2bf7194
--- /dev/null
+++ b/nsock/src/configure
@@ -0,0 +1,6298 @@
+#! /bin/sh
+# Guess values for system-dependent variables and create Makefiles.
+# Generated by GNU Autoconf 2.69.
+#
+#
+# Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
+#
+#
+# This configure script is free software; the Free Software Foundation
+# gives unlimited permission to copy, distribute and modify it.
+## -------------------- ##
+## M4sh Initialization. ##
+## -------------------- ##
+
+# Be more Bourne compatible
+DUALCASE=1; export DUALCASE # for MKS sh
+if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then :
+  emulate sh
+  NULLCMD=:
+  # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which
+  # is contrary to our usage.  Disable this feature.
+  alias -g '${1+"$@"}'='"$@"'
+  setopt NO_GLOB_SUBST
+else
+  case `(set -o) 2>/dev/null` in #(
+  *posix*) :
+    set -o posix ;; #(
+  *) :
+     ;;
+esac
+fi
+
+
+as_nl='
+'
+export as_nl
+# Printing a long string crashes Solaris 7 /usr/bin/printf.
+as_echo='\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'
+as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo
+as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo$as_echo
+# Prefer a ksh shell builtin over an external printf program on Solaris,
+# but without wasting forks for bash or zsh.
+if test -z "$BASH_VERSION$ZSH_VERSION" \
+    && (test "X`print -r -- $as_echo`" = "X$as_echo") 2>/dev/null; then
+  as_echo='print -r --'
+  as_echo_n='print -rn --'
+elif (test "X`printf %s $as_echo`" = "X$as_echo") 2>/dev/null; then
+  as_echo='printf %s\n'
+  as_echo_n='printf %s'
+else
+  if test "X`(/usr/ucb/echo -n -n $as_echo) 2>/dev/null`" = "X-n $as_echo"; then
+    as_echo_body='eval /usr/ucb/echo -n "$1$as_nl"'
+    as_echo_n='/usr/ucb/echo -n'
+  else
+    as_echo_body='eval expr "X$1" : "X\\(.*\\)"'
+    as_echo_n_body='eval
+      arg=$1;
+      case $arg in #(
+      *"$as_nl"*)
+	expr "X$arg" : "X\\(.*\\)$as_nl";
+	arg=`expr "X$arg" : ".*$as_nl\\(.*\\)"`;;
+      esac;
+      expr "X$arg" : "X\\(.*\\)" | tr -d "$as_nl"
+    '
+    export as_echo_n_body
+    as_echo_n='sh -c $as_echo_n_body as_echo'
+  fi
+  export as_echo_body
+  as_echo='sh -c $as_echo_body as_echo'
+fi
+
+# The user is always right.
+if test "${PATH_SEPARATOR+set}" != set; then
+  PATH_SEPARATOR=:
+  (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 && {
+    (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 ||
+      PATH_SEPARATOR=';'
+  }
+fi
+
+
+# IFS
+# We need space, tab and new line, in precisely that order.  Quoting is
+# there to prevent editors from complaining about space-tab.
+# (If _AS_PATH_WALK were called with IFS unset, it would disable word
+# splitting by setting IFS to empty value.)
+IFS=" ""	$as_nl"
+
+# Find who we are.  Look in the path if we contain no directory separator.
+as_myself=
+case $0 in #((
+  *[\\/]* ) as_myself=$0 ;;
+  *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    test -r "$as_dir/$0" && as_myself=$as_dir/$0 && break
+  done
+IFS=$as_save_IFS
+
+     ;;
+esac
+# We did not find ourselves, most probably we were run as `sh COMMAND'
+# in which case we are not to be found in the path.
+if test "x$as_myself" = x; then
+  as_myself=$0
+fi
+if test ! -f "$as_myself"; then
+  $as_echo "$as_myself: error: cannot find myself; rerun with an absolute file name" >&2
+  exit 1
+fi
+
+# Unset variables that we do not need and which cause bugs (e.g. in
+# pre-3.0 UWIN ksh).  But do not cause bugs in bash 2.01; the "|| exit 1"
+# suppresses any "Segmentation fault" message there.  '((' could
+# trigger a bug in pdksh 5.2.14.
+for as_var in BASH_ENV ENV MAIL MAILPATH
+do eval test x\${$as_var+set} = xset \
+  && ( (unset $as_var) || exit 1) >/dev/null 2>&1 && unset $as_var || :
+done
+PS1='$ '
+PS2='> '
+PS4='+ '
+
+# NLS nuisances.
+LC_ALL=C
+export LC_ALL
+LANGUAGE=C
+export LANGUAGE
+
+# CDPATH.
+(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
+
+# Use a proper internal environment variable to ensure we don't fall
+  # into an infinite loop, continuously re-executing ourselves.
+  if test x"${_as_can_reexec}" != xno && test "x$CONFIG_SHELL" != x; then
+    _as_can_reexec=no; export _as_can_reexec;
+    # We cannot yet assume a decent shell, so we have to provide a
+# neutralization value for shells without unset; and this also
+# works around shells that cannot unset nonexistent variables.
+# Preserve -v and -x to the replacement shell.
+BASH_ENV=/dev/null
+ENV=/dev/null
+(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
+case $- in # ((((
+  *v*x* | *x*v* ) as_opts=-vx ;;
+  *v* ) as_opts=-v ;;
+  *x* ) as_opts=-x ;;
+  * ) as_opts= ;;
+esac
+exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
+# Admittedly, this is quite paranoid, since all the known shells bail
+# out after a failed `exec'.
+$as_echo "$0: could not re-execute with $CONFIG_SHELL" >&2
+as_fn_exit 255
+  fi
+  # We don't want this to propagate to other subprocesses.
+          { _as_can_reexec=; unset _as_can_reexec;}
+if test "x$CONFIG_SHELL" = x; then
+  as_bourne_compatible="if test -n \"\${ZSH_VERSION+set}\" && (emulate sh) >/dev/null 2>&1; then :
+  emulate sh
+  NULLCMD=:
+  # Pre-4.2 versions of Zsh do word splitting on \${1+\"\$@\"}, which
+  # is contrary to our usage.  Disable this feature.
+  alias -g '\${1+\"\$@\"}'='\"\$@\"'
+  setopt NO_GLOB_SUBST
+else
+  case \`(set -o) 2>/dev/null\` in #(
+  *posix*) :
+    set -o posix ;; #(
+  *) :
+     ;;
+esac
+fi
+"
+  as_required="as_fn_return () { (exit \$1); }
+as_fn_success () { as_fn_return 0; }
+as_fn_failure () { as_fn_return 1; }
+as_fn_ret_success () { return 0; }
+as_fn_ret_failure () { return 1; }
+
+exitcode=0
+as_fn_success || { exitcode=1; echo as_fn_success failed.; }
+as_fn_failure && { exitcode=1; echo as_fn_failure succeeded.; }
+as_fn_ret_success || { exitcode=1; echo as_fn_ret_success failed.; }
+as_fn_ret_failure && { exitcode=1; echo as_fn_ret_failure succeeded.; }
+if ( set x; as_fn_ret_success y && test x = \"\$1\" ); then :
+
+else
+  exitcode=1; echo positional parameters were not saved.
+fi
+test x\$exitcode = x0 || exit 1
+test -x / || exit 1"
+  as_suggested="  as_lineno_1=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" as_lineno_1a=\$LINENO
+  as_lineno_2=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" as_lineno_2a=\$LINENO
+  eval 'test \"x\$as_lineno_1'\$as_run'\" != \"x\$as_lineno_2'\$as_run'\" &&
+  test \"x\`expr \$as_lineno_1'\$as_run' + 1\`\" = \"x\$as_lineno_2'\$as_run'\"' || exit 1
+test \$(( 1 + 1 )) = 2 || exit 1"
+  if (eval "$as_required") 2>/dev/null; then :
+  as_have_required=yes
+else
+  as_have_required=no
+fi
+  if test x$as_have_required = xyes && (eval "$as_suggested") 2>/dev/null; then :
+
+else
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+as_found=false
+for as_dir in /bin$PATH_SEPARATOR/usr/bin$PATH_SEPARATOR$PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+  as_found=:
+  case $as_dir in #(
+	 /*)
+	   for as_base in sh bash ksh sh5; do
+	     # Try only shells that exist, to save several forks.
+	     as_shell=$as_dir/$as_base
+	     if { test -f "$as_shell" || test -f "$as_shell.exe"; } &&
+		    { $as_echo "$as_bourne_compatible""$as_required" | as_run=a "$as_shell"; } 2>/dev/null; then :
+  CONFIG_SHELL=$as_shell as_have_required=yes
+		   if { $as_echo "$as_bourne_compatible""$as_suggested" | as_run=a "$as_shell"; } 2>/dev/null; then :
+  break 2
+fi
+fi
+	   done;;
+       esac
+  as_found=false
+done
+$as_found || { if { test -f "$SHELL" || test -f "$SHELL.exe"; } &&
+	      { $as_echo "$as_bourne_compatible""$as_required" | as_run=a "$SHELL"; } 2>/dev/null; then :
+  CONFIG_SHELL=$SHELL as_have_required=yes
+fi; }
+IFS=$as_save_IFS
+
+
+      if test "x$CONFIG_SHELL" != x; then :
+  export CONFIG_SHELL
+             # We cannot yet assume a decent shell, so we have to provide a
+# neutralization value for shells without unset; and this also
+# works around shells that cannot unset nonexistent variables.
+# Preserve -v and -x to the replacement shell.
+BASH_ENV=/dev/null
+ENV=/dev/null
+(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
+case $- in # ((((
+  *v*x* | *x*v* ) as_opts=-vx ;;
+  *v* ) as_opts=-v ;;
+  *x* ) as_opts=-x ;;
+  * ) as_opts= ;;
+esac
+exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
+# Admittedly, this is quite paranoid, since all the known shells bail
+# out after a failed `exec'.
+$as_echo "$0: could not re-execute with $CONFIG_SHELL" >&2
+exit 255
+fi
+
+    if test x$as_have_required = xno; then :
+  $as_echo "$0: This script requires a shell more modern than all"
+  $as_echo "$0: the shells that I found on your system."
+  if test x${ZSH_VERSION+set} = xset ; then
+    $as_echo "$0: In particular, zsh $ZSH_VERSION has bugs and should"
+    $as_echo "$0: be upgraded to zsh 4.3.4 or later."
+  else
+    $as_echo "$0: Please tell bug-autoconf@gnu.org about your system,
+$0: including any error possibly output before this
+$0: message. Then install a modern shell, or manually run
+$0: the script under such a shell if you do have one."
+  fi
+  exit 1
+fi
+fi
+fi
+SHELL=${CONFIG_SHELL-/bin/sh}
+export SHELL
+# Unset more variables known to interfere with behavior of common tools.
+CLICOLOR_FORCE= GREP_OPTIONS=
+unset CLICOLOR_FORCE GREP_OPTIONS
+
+## --------------------- ##
+## M4sh Shell Functions. ##
+## --------------------- ##
+# as_fn_unset VAR
+# ---------------
+# Portably unset VAR.
+as_fn_unset ()
+{
+  { eval $1=; unset $1;}
+}
+as_unset=as_fn_unset
+
+# as_fn_set_status STATUS
+# -----------------------
+# Set $? to STATUS, without forking.
+as_fn_set_status ()
+{
+  return $1
+} # as_fn_set_status
+
+# as_fn_exit STATUS
+# -----------------
+# Exit the shell with STATUS, even in a "trap 0" or "set -e" context.
+as_fn_exit ()
+{
+  set +e
+  as_fn_set_status $1
+  exit $1
+} # as_fn_exit
+
+# as_fn_mkdir_p
+# -------------
+# Create "$as_dir" as a directory, including parents if necessary.
+as_fn_mkdir_p ()
+{
+
+  case $as_dir in #(
+  -*) as_dir=./$as_dir;;
+  esac
+  test -d "$as_dir" || eval $as_mkdir_p || {
+    as_dirs=
+    while :; do
+      case $as_dir in #(
+      *\'*) as_qdir=`$as_echo "$as_dir" | sed "s/'/'\\\\\\\\''/g"`;; #'(
+      *) as_qdir=$as_dir;;
+      esac
+      as_dirs="'$as_qdir' $as_dirs"
+      as_dir=`$as_dirname -- "$as_dir" ||
+$as_expr X"$as_dir" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$as_dir" : 'X\(//\)[^/]' \| \
+	 X"$as_dir" : 'X\(//\)$' \| \
+	 X"$as_dir" : 'X\(/\)' \| . 2>/dev/null ||
+$as_echo X"$as_dir" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+      test -d "$as_dir" && break
+    done
+    test -z "$as_dirs" || eval "mkdir $as_dirs"
+  } || test -d "$as_dir" || as_fn_error $? "cannot create directory $as_dir"
+
+
+} # as_fn_mkdir_p
+
+# as_fn_executable_p FILE
+# -----------------------
+# Test if FILE is an executable regular file.
+as_fn_executable_p ()
+{
+  test -f "$1" && test -x "$1"
+} # as_fn_executable_p
+# as_fn_append VAR VALUE
+# ----------------------
+# Append the text in VALUE to the end of the definition contained in VAR. Take
+# advantage of any shell optimizations that allow amortized linear growth over
+# repeated appends, instead of the typical quadratic growth present in naive
+# implementations.
+if (eval "as_var=1; as_var+=2; test x\$as_var = x12") 2>/dev/null; then :
+  eval 'as_fn_append ()
+  {
+    eval $1+=\$2
+  }'
+else
+  as_fn_append ()
+  {
+    eval $1=\$$1\$2
+  }
+fi # as_fn_append
+
+# as_fn_arith ARG...
+# ------------------
+# Perform arithmetic evaluation on the ARGs, and store the result in the
+# global $as_val. Take advantage of shells that can avoid forks. The arguments
+# must be portable across $(()) and expr.
+if (eval "test \$(( 1 + 1 )) = 2") 2>/dev/null; then :
+  eval 'as_fn_arith ()
+  {
+    as_val=$(( $* ))
+  }'
+else
+  as_fn_arith ()
+  {
+    as_val=`expr "$@" || test $? -eq 1`
+  }
+fi # as_fn_arith
+
+
+# as_fn_error STATUS ERROR [LINENO LOG_FD]
+# ----------------------------------------
+# Output "`basename $0`: error: ERROR" to stderr. If LINENO and LOG_FD are
+# provided, also output the error to LOG_FD, referencing LINENO. Then exit the
+# script with STATUS, using 1 if that was 0.
+as_fn_error ()
+{
+  as_status=$1; test $as_status -eq 0 && as_status=1
+  if test "$4"; then
+    as_lineno=${as_lineno-"$3"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+    $as_echo "$as_me:${as_lineno-$LINENO}: error: $2" >&$4
+  fi
+  $as_echo "$as_me: error: $2" >&2
+  as_fn_exit $as_status
+} # as_fn_error
+
+if expr a : '\(a\)' >/dev/null 2>&1 &&
+   test "X`expr 00001 : '.*\(...\)'`" = X001; then
+  as_expr=expr
+else
+  as_expr=false
+fi
+
+if (basename -- /) >/dev/null 2>&1 && test "X`basename -- / 2>&1`" = "X/"; then
+  as_basename=basename
+else
+  as_basename=false
+fi
+
+if (as_dir=`dirname -- /` && test "X$as_dir" = X/) >/dev/null 2>&1; then
+  as_dirname=dirname
+else
+  as_dirname=false
+fi
+
+as_me=`$as_basename -- "$0" ||
+$as_expr X/"$0" : '.*/\([^/][^/]*\)/*$' \| \
+	 X"$0" : 'X\(//\)$' \| \
+	 X"$0" : 'X\(/\)' \| . 2>/dev/null ||
+$as_echo X/"$0" |
+    sed '/^.*\/\([^/][^/]*\)\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+
+# Avoid depending upon Character Ranges.
+as_cr_letters='abcdefghijklmnopqrstuvwxyz'
+as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+as_cr_Letters=$as_cr_letters$as_cr_LETTERS
+as_cr_digits='0123456789'
+as_cr_alnum=$as_cr_Letters$as_cr_digits
+
+
+  as_lineno_1=$LINENO as_lineno_1a=$LINENO
+  as_lineno_2=$LINENO as_lineno_2a=$LINENO
+  eval 'test "x$as_lineno_1'$as_run'" != "x$as_lineno_2'$as_run'" &&
+  test "x`expr $as_lineno_1'$as_run' + 1`" = "x$as_lineno_2'$as_run'"' || {
+  # Blame Lee E. McMahon (1931-1989) for sed's syntax.  :-)
+  sed -n '
+    p
+    /[$]LINENO/=
+  ' <$as_myself |
+    sed '
+      s/[$]LINENO.*/&-/
+      t lineno
+      b
+      :lineno
+      N
+      :loop
+      s/[$]LINENO\([^'$as_cr_alnum'_].*\n\)\(.*\)/\2\1\2/
+      t loop
+      s/-\n.*//
+    ' >$as_me.lineno &&
+  chmod +x "$as_me.lineno" ||
+    { $as_echo "$as_me: error: cannot create $as_me.lineno; rerun with a POSIX shell" >&2; as_fn_exit 1; }
+
+  # If we had to re-execute with $CONFIG_SHELL, we're ensured to have
+  # already done that, so ensure we don't try to do so again and fall
+  # in an infinite loop.  This has already happened in practice.
+  _as_can_reexec=no; export _as_can_reexec
+  # Don't try to exec as it changes $[0], causing all sort of problems
+  # (the dirname of $[0] is not the place where we might find the
+  # original and so on.  Autoconf is especially sensitive to this).
+  . "./$as_me.lineno"
+  # Exit status is that of the last command.
+  exit
+}
+
+ECHO_C= ECHO_N= ECHO_T=
+case `echo -n x` in #(((((
+-n*)
+  case `echo 'xy\c'` in
+  *c*) ECHO_T='	';;	# ECHO_T is single tab character.
+  xy)  ECHO_C='\c';;
+  *)   echo `echo ksh88 bug on AIX 6.1` > /dev/null
+       ECHO_T='	';;
+  esac;;
+*)
+  ECHO_N='-n';;
+esac
+
+rm -f conf$$ conf$$.exe conf$$.file
+if test -d conf$$.dir; then
+  rm -f conf$$.dir/conf$$.file
+else
+  rm -f conf$$.dir
+  mkdir conf$$.dir 2>/dev/null
+fi
+if (echo >conf$$.file) 2>/dev/null; then
+  if ln -s conf$$.file conf$$ 2>/dev/null; then
+    as_ln_s='ln -s'
+    # ... but there are two gotchas:
+    # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
+    # 2) DJGPP < 2.04 has no symlinks; `ln -s' creates a wrapper executable.
+    # In both cases, we have to default to `cp -pR'.
+    ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
+      as_ln_s='cp -pR'
+  elif ln conf$$.file conf$$ 2>/dev/null; then
+    as_ln_s=ln
+  else
+    as_ln_s='cp -pR'
+  fi
+else
+  as_ln_s='cp -pR'
+fi
+rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
+rmdir conf$$.dir 2>/dev/null
+
+if mkdir -p . 2>/dev/null; then
+  as_mkdir_p='mkdir -p "$as_dir"'
+else
+  test -d ./-p && rmdir ./-p
+  as_mkdir_p=false
+fi
+
+as_test_x='test -x'
+as_executable_p=as_fn_executable_p
+
+# Sed expression to map a string onto a valid CPP name.
+as_tr_cpp="eval sed 'y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g'"
+
+# Sed expression to map a string onto a valid variable name.
+as_tr_sh="eval sed 'y%*+%pp%;s%[^_$as_cr_alnum]%_%g'"
+
+
+test -n "$DJDIR" || exec 7<&0 </dev/null
+exec 6>&1
+
+# Name of the host.
+# hostname on some systems (SVR3.2, old GNU/Linux) returns a bogus exit status,
+# so uname gets run too.
+ac_hostname=`(hostname || uname -n) 2>/dev/null | sed 1q`
+
+#
+# Initializations.
+#
+ac_default_prefix=/usr/local
+ac_clean_files=
+ac_config_libobj_dir=.
+LIBOBJS=
+cross_compiling=no
+subdirs=
+MFLAGS=
+MAKEFLAGS=
+
+# Identity of this package.
+PACKAGE_NAME=
+PACKAGE_TARNAME=
+PACKAGE_VERSION=
+PACKAGE_STRING=
+PACKAGE_BUGREPORT=
+PACKAGE_URL=
+
+ac_unique_file="nsock_core.c"
+# Factoring default headers for most tests.
+ac_includes_default="\
+#include <stdio.h>
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_STRING_H
+# if !defined STDC_HEADERS && defined HAVE_MEMORY_H
+#  include <memory.h>
+# endif
+# include <string.h>
+#endif
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif
+#ifdef HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif"
+
+ac_subst_vars='LTLIBOBJS
+LIBOBJS
+NSOCKTESTDIR
+NBASEDIR
+LIBNBASE_LIBS
+OPENSSL_LIBS
+RANLIB
+LIBPCAP_LIBS
+EGREP
+GREP
+CPP
+OBJEXT
+EXEEXT
+ac_ct_CC
+CPPFLAGS
+LDFLAGS
+CFLAGS
+CC
+host_os
+host_vendor
+host_cpu
+host
+build_os
+build_vendor
+build_cpu
+build
+target_alias
+host_alias
+build_alias
+LIBS
+ECHO_T
+ECHO_N
+ECHO_C
+DEFS
+mandir
+localedir
+libdir
+psdir
+pdfdir
+dvidir
+htmldir
+infodir
+docdir
+oldincludedir
+includedir
+runstatedir
+localstatedir
+sharedstatedir
+sysconfdir
+datadir
+datarootdir
+libexecdir
+sbindir
+bindir
+program_transform_name
+prefix
+exec_prefix
+PACKAGE_URL
+PACKAGE_BUGREPORT
+PACKAGE_STRING
+PACKAGE_VERSION
+PACKAGE_TARNAME
+PACKAGE_NAME
+PATH_SEPARATOR
+SHELL'
+ac_subst_files=''
+ac_user_opts='
+enable_option_checking
+with_localdirs
+with_libpcap
+with_openssl
+with_libnbase
+'
+      ac_precious_vars='build_alias
+host_alias
+target_alias
+CC
+CFLAGS
+LDFLAGS
+LIBS
+CPPFLAGS
+CPP'
+
+
+# Initialize some variables set by options.
+ac_init_help=
+ac_init_version=false
+ac_unrecognized_opts=
+ac_unrecognized_sep=
+# The variables have the same names as the options, with
+# dashes changed to underlines.
+cache_file=/dev/null
+exec_prefix=NONE
+no_create=
+no_recursion=
+prefix=NONE
+program_prefix=NONE
+program_suffix=NONE
+program_transform_name=s,x,x,
+silent=
+site=
+srcdir=
+verbose=
+x_includes=NONE
+x_libraries=NONE
+
+# Installation directory options.
+# These are left unexpanded so users can "make install exec_prefix=/foo"
+# and all the variables that are supposed to be based on exec_prefix
+# by default will actually change.
+# Use braces instead of parens because sh, perl, etc. also accept them.
+# (The list follows the same order as the GNU Coding Standards.)
+bindir='${exec_prefix}/bin'
+sbindir='${exec_prefix}/sbin'
+libexecdir='${exec_prefix}/libexec'
+datarootdir='${prefix}/share'
+datadir='${datarootdir}'
+sysconfdir='${prefix}/etc'
+sharedstatedir='${prefix}/com'
+localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
+includedir='${prefix}/include'
+oldincludedir='/usr/include'
+docdir='${datarootdir}/doc/${PACKAGE}'
+infodir='${datarootdir}/info'
+htmldir='${docdir}'
+dvidir='${docdir}'
+pdfdir='${docdir}'
+psdir='${docdir}'
+libdir='${exec_prefix}/lib'
+localedir='${datarootdir}/locale'
+mandir='${datarootdir}/man'
+
+ac_prev=
+ac_dashdash=
+for ac_option
+do
+  # If the previous option needs an argument, assign it.
+  if test -n "$ac_prev"; then
+    eval $ac_prev=\$ac_option
+    ac_prev=
+    continue
+  fi
+
+  case $ac_option in
+  *=?*) ac_optarg=`expr "X$ac_option" : '[^=]*=\(.*\)'` ;;
+  *=)   ac_optarg= ;;
+  *)    ac_optarg=yes ;;
+  esac
+
+  # Accept the important Cygnus configure options, so we can diagnose typos.
+
+  case $ac_dashdash$ac_option in
+  --)
+    ac_dashdash=yes ;;
+
+  -bindir | --bindir | --bindi | --bind | --bin | --bi)
+    ac_prev=bindir ;;
+  -bindir=* | --bindir=* | --bindi=* | --bind=* | --bin=* | --bi=*)
+    bindir=$ac_optarg ;;
+
+  -build | --build | --buil | --bui | --bu)
+    ac_prev=build_alias ;;
+  -build=* | --build=* | --buil=* | --bui=* | --bu=*)
+    build_alias=$ac_optarg ;;
+
+  -cache-file | --cache-file | --cache-fil | --cache-fi \
+  | --cache-f | --cache- | --cache | --cach | --cac | --ca | --c)
+    ac_prev=cache_file ;;
+  -cache-file=* | --cache-file=* | --cache-fil=* | --cache-fi=* \
+  | --cache-f=* | --cache-=* | --cache=* | --cach=* | --cac=* | --ca=* | --c=*)
+    cache_file=$ac_optarg ;;
+
+  --config-cache | -C)
+    cache_file=config.cache ;;
+
+  -datadir | --datadir | --datadi | --datad)
+    ac_prev=datadir ;;
+  -datadir=* | --datadir=* | --datadi=* | --datad=*)
+    datadir=$ac_optarg ;;
+
+  -datarootdir | --datarootdir | --datarootdi | --datarootd | --dataroot \
+  | --dataroo | --dataro | --datar)
+    ac_prev=datarootdir ;;
+  -datarootdir=* | --datarootdir=* | --datarootdi=* | --datarootd=* \
+  | --dataroot=* | --dataroo=* | --dataro=* | --datar=*)
+    datarootdir=$ac_optarg ;;
+
+  -disable-* | --disable-*)
+    ac_useropt=`expr "x$ac_option" : 'x-*disable-\(.*\)'`
+    # Reject names that are not valid shell variable names.
+    expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
+      as_fn_error $? "invalid feature name: $ac_useropt"
+    ac_useropt_orig=$ac_useropt
+    ac_useropt=`$as_echo "$ac_useropt" | sed 's/[-+.]/_/g'`
+    case $ac_user_opts in
+      *"
+"enable_$ac_useropt"
+"*) ;;
+      *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--disable-$ac_useropt_orig"
+	 ac_unrecognized_sep=', ';;
+    esac
+    eval enable_$ac_useropt=no ;;
+
+  -docdir | --docdir | --docdi | --doc | --do)
+    ac_prev=docdir ;;
+  -docdir=* | --docdir=* | --docdi=* | --doc=* | --do=*)
+    docdir=$ac_optarg ;;
+
+  -dvidir | --dvidir | --dvidi | --dvid | --dvi | --dv)
+    ac_prev=dvidir ;;
+  -dvidir=* | --dvidir=* | --dvidi=* | --dvid=* | --dvi=* | --dv=*)
+    dvidir=$ac_optarg ;;
+
+  -enable-* | --enable-*)
+    ac_useropt=`expr "x$ac_option" : 'x-*enable-\([^=]*\)'`
+    # Reject names that are not valid shell variable names.
+    expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
+      as_fn_error $? "invalid feature name: $ac_useropt"
+    ac_useropt_orig=$ac_useropt
+    ac_useropt=`$as_echo "$ac_useropt" | sed 's/[-+.]/_/g'`
+    case $ac_user_opts in
+      *"
+"enable_$ac_useropt"
+"*) ;;
+      *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--enable-$ac_useropt_orig"
+	 ac_unrecognized_sep=', ';;
+    esac
+    eval enable_$ac_useropt=\$ac_optarg ;;
+
+  -exec-prefix | --exec_prefix | --exec-prefix | --exec-prefi \
+  | --exec-pref | --exec-pre | --exec-pr | --exec-p | --exec- \
+  | --exec | --exe | --ex)
+    ac_prev=exec_prefix ;;
+  -exec-prefix=* | --exec_prefix=* | --exec-prefix=* | --exec-prefi=* \
+  | --exec-pref=* | --exec-pre=* | --exec-pr=* | --exec-p=* | --exec-=* \
+  | --exec=* | --exe=* | --ex=*)
+    exec_prefix=$ac_optarg ;;
+
+  -gas | --gas | --ga | --g)
+    # Obsolete; use --with-gas.
+    with_gas=yes ;;
+
+  -help | --help | --hel | --he | -h)
+    ac_init_help=long ;;
+  -help=r* | --help=r* | --hel=r* | --he=r* | -hr*)
+    ac_init_help=recursive ;;
+  -help=s* | --help=s* | --hel=s* | --he=s* | -hs*)
+    ac_init_help=short ;;
+
+  -host | --host | --hos | --ho)
+    ac_prev=host_alias ;;
+  -host=* | --host=* | --hos=* | --ho=*)
+    host_alias=$ac_optarg ;;
+
+  -htmldir | --htmldir | --htmldi | --htmld | --html | --htm | --ht)
+    ac_prev=htmldir ;;
+  -htmldir=* | --htmldir=* | --htmldi=* | --htmld=* | --html=* | --htm=* \
+  | --ht=*)
+    htmldir=$ac_optarg ;;
+
+  -includedir | --includedir | --includedi | --included | --include \
+  | --includ | --inclu | --incl | --inc)
+    ac_prev=includedir ;;
+  -includedir=* | --includedir=* | --includedi=* | --included=* | --include=* \
+  | --includ=* | --inclu=* | --incl=* | --inc=*)
+    includedir=$ac_optarg ;;
+
+  -infodir | --infodir | --infodi | --infod | --info | --inf)
+    ac_prev=infodir ;;
+  -infodir=* | --infodir=* | --infodi=* | --infod=* | --info=* | --inf=*)
+    infodir=$ac_optarg ;;
+
+  -libdir | --libdir | --libdi | --libd)
+    ac_prev=libdir ;;
+  -libdir=* | --libdir=* | --libdi=* | --libd=*)
+    libdir=$ac_optarg ;;
+
+  -libexecdir | --libexecdir | --libexecdi | --libexecd | --libexec \
+  | --libexe | --libex | --libe)
+    ac_prev=libexecdir ;;
+  -libexecdir=* | --libexecdir=* | --libexecdi=* | --libexecd=* | --libexec=* \
+  | --libexe=* | --libex=* | --libe=*)
+    libexecdir=$ac_optarg ;;
+
+  -localedir | --localedir | --localedi | --localed | --locale)
+    ac_prev=localedir ;;
+  -localedir=* | --localedir=* | --localedi=* | --localed=* | --locale=*)
+    localedir=$ac_optarg ;;
+
+  -localstatedir | --localstatedir | --localstatedi | --localstated \
+  | --localstate | --localstat | --localsta | --localst | --locals)
+    ac_prev=localstatedir ;;
+  -localstatedir=* | --localstatedir=* | --localstatedi=* | --localstated=* \
+  | --localstate=* | --localstat=* | --localsta=* | --localst=* | --locals=*)
+    localstatedir=$ac_optarg ;;
+
+  -mandir | --mandir | --mandi | --mand | --man | --ma | --m)
+    ac_prev=mandir ;;
+  -mandir=* | --mandir=* | --mandi=* | --mand=* | --man=* | --ma=* | --m=*)
+    mandir=$ac_optarg ;;
+
+  -nfp | --nfp | --nf)
+    # Obsolete; use --without-fp.
+    with_fp=no ;;
+
+  -no-create | --no-create | --no-creat | --no-crea | --no-cre \
+  | --no-cr | --no-c | -n)
+    no_create=yes ;;
+
+  -no-recursion | --no-recursion | --no-recursio | --no-recursi \
+  | --no-recurs | --no-recur | --no-recu | --no-rec | --no-re | --no-r)
+    no_recursion=yes ;;
+
+  -oldincludedir | --oldincludedir | --oldincludedi | --oldincluded \
+  | --oldinclude | --oldinclud | --oldinclu | --oldincl | --oldinc \
+  | --oldin | --oldi | --old | --ol | --o)
+    ac_prev=oldincludedir ;;
+  -oldincludedir=* | --oldincludedir=* | --oldincludedi=* | --oldincluded=* \
+  | --oldinclude=* | --oldinclud=* | --oldinclu=* | --oldincl=* | --oldinc=* \
+  | --oldin=* | --oldi=* | --old=* | --ol=* | --o=*)
+    oldincludedir=$ac_optarg ;;
+
+  -prefix | --prefix | --prefi | --pref | --pre | --pr | --p)
+    ac_prev=prefix ;;
+  -prefix=* | --prefix=* | --prefi=* | --pref=* | --pre=* | --pr=* | --p=*)
+    prefix=$ac_optarg ;;
+
+  -program-prefix | --program-prefix | --program-prefi | --program-pref \
+  | --program-pre | --program-pr | --program-p)
+    ac_prev=program_prefix ;;
+  -program-prefix=* | --program-prefix=* | --program-prefi=* \
+  | --program-pref=* | --program-pre=* | --program-pr=* | --program-p=*)
+    program_prefix=$ac_optarg ;;
+
+  -program-suffix | --program-suffix | --program-suffi | --program-suff \
+  | --program-suf | --program-su | --program-s)
+    ac_prev=program_suffix ;;
+  -program-suffix=* | --program-suffix=* | --program-suffi=* \
+  | --program-suff=* | --program-suf=* | --program-su=* | --program-s=*)
+    program_suffix=$ac_optarg ;;
+
+  -program-transform-name | --program-transform-name \
+  | --program-transform-nam | --program-transform-na \
+  | --program-transform-n | --program-transform- \
+  | --program-transform | --program-transfor \
+  | --program-transfo | --program-transf \
+  | --program-trans | --program-tran \
+  | --progr-tra | --program-tr | --program-t)
+    ac_prev=program_transform_name ;;
+  -program-transform-name=* | --program-transform-name=* \
+  | --program-transform-nam=* | --program-transform-na=* \
+  | --program-transform-n=* | --program-transform-=* \
+  | --program-transform=* | --program-transfor=* \
+  | --program-transfo=* | --program-transf=* \
+  | --program-trans=* | --program-tran=* \
+  | --progr-tra=* | --program-tr=* | --program-t=*)
+    program_transform_name=$ac_optarg ;;
+
+  -pdfdir | --pdfdir | --pdfdi | --pdfd | --pdf | --pd)
+    ac_prev=pdfdir ;;
+  -pdfdir=* | --pdfdir=* | --pdfdi=* | --pdfd=* | --pdf=* | --pd=*)
+    pdfdir=$ac_optarg ;;
+
+  -psdir | --psdir | --psdi | --psd | --ps)
+    ac_prev=psdir ;;
+  -psdir=* | --psdir=* | --psdi=* | --psd=* | --ps=*)
+    psdir=$ac_optarg ;;
+
+  -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+  | -silent | --silent | --silen | --sile | --sil)
+    silent=yes ;;
+
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
+  -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
+    ac_prev=sbindir ;;
+  -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
+  | --sbi=* | --sb=*)
+    sbindir=$ac_optarg ;;
+
+  -sharedstatedir | --sharedstatedir | --sharedstatedi \
+  | --sharedstated | --sharedstate | --sharedstat | --sharedsta \
+  | --sharedst | --shareds | --shared | --share | --shar \
+  | --sha | --sh)
+    ac_prev=sharedstatedir ;;
+  -sharedstatedir=* | --sharedstatedir=* | --sharedstatedi=* \
+  | --sharedstated=* | --sharedstate=* | --sharedstat=* | --sharedsta=* \
+  | --sharedst=* | --shareds=* | --shared=* | --share=* | --shar=* \
+  | --sha=* | --sh=*)
+    sharedstatedir=$ac_optarg ;;
+
+  -site | --site | --sit)
+    ac_prev=site ;;
+  -site=* | --site=* | --sit=*)
+    site=$ac_optarg ;;
+
+  -srcdir | --srcdir | --srcdi | --srcd | --src | --sr)
+    ac_prev=srcdir ;;
+  -srcdir=* | --srcdir=* | --srcdi=* | --srcd=* | --src=* | --sr=*)
+    srcdir=$ac_optarg ;;
+
+  -sysconfdir | --sysconfdir | --sysconfdi | --sysconfd | --sysconf \
+  | --syscon | --sysco | --sysc | --sys | --sy)
+    ac_prev=sysconfdir ;;
+  -sysconfdir=* | --sysconfdir=* | --sysconfdi=* | --sysconfd=* | --sysconf=* \
+  | --syscon=* | --sysco=* | --sysc=* | --sys=* | --sy=*)
+    sysconfdir=$ac_optarg ;;
+
+  -target | --target | --targe | --targ | --tar | --ta | --t)
+    ac_prev=target_alias ;;
+  -target=* | --target=* | --targe=* | --targ=* | --tar=* | --ta=* | --t=*)
+    target_alias=$ac_optarg ;;
+
+  -v | -verbose | --verbose | --verbos | --verbo | --verb)
+    verbose=yes ;;
+
+  -version | --version | --versio | --versi | --vers | -V)
+    ac_init_version=: ;;
+
+  -with-* | --with-*)
+    ac_useropt=`expr "x$ac_option" : 'x-*with-\([^=]*\)'`
+    # Reject names that are not valid shell variable names.
+    expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
+      as_fn_error $? "invalid package name: $ac_useropt"
+    ac_useropt_orig=$ac_useropt
+    ac_useropt=`$as_echo "$ac_useropt" | sed 's/[-+.]/_/g'`
+    case $ac_user_opts in
+      *"
+"with_$ac_useropt"
+"*) ;;
+      *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--with-$ac_useropt_orig"
+	 ac_unrecognized_sep=', ';;
+    esac
+    eval with_$ac_useropt=\$ac_optarg ;;
+
+  -without-* | --without-*)
+    ac_useropt=`expr "x$ac_option" : 'x-*without-\(.*\)'`
+    # Reject names that are not valid shell variable names.
+    expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
+      as_fn_error $? "invalid package name: $ac_useropt"
+    ac_useropt_orig=$ac_useropt
+    ac_useropt=`$as_echo "$ac_useropt" | sed 's/[-+.]/_/g'`
+    case $ac_user_opts in
+      *"
+"with_$ac_useropt"
+"*) ;;
+      *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--without-$ac_useropt_orig"
+	 ac_unrecognized_sep=', ';;
+    esac
+    eval with_$ac_useropt=no ;;
+
+  --x)
+    # Obsolete; use --with-x.
+    with_x=yes ;;
+
+  -x-includes | --x-includes | --x-include | --x-includ | --x-inclu \
+  | --x-incl | --x-inc | --x-in | --x-i)
+    ac_prev=x_includes ;;
+  -x-includes=* | --x-includes=* | --x-include=* | --x-includ=* | --x-inclu=* \
+  | --x-incl=* | --x-inc=* | --x-in=* | --x-i=*)
+    x_includes=$ac_optarg ;;
+
+  -x-libraries | --x-libraries | --x-librarie | --x-librari \
+  | --x-librar | --x-libra | --x-libr | --x-lib | --x-li | --x-l)
+    ac_prev=x_libraries ;;
+  -x-libraries=* | --x-libraries=* | --x-librarie=* | --x-librari=* \
+  | --x-librar=* | --x-libra=* | --x-libr=* | --x-lib=* | --x-li=* | --x-l=*)
+    x_libraries=$ac_optarg ;;
+
+  -*) as_fn_error $? "unrecognized option: \`$ac_option'
+Try \`$0 --help' for more information"
+    ;;
+
+  *=*)
+    ac_envvar=`expr "x$ac_option" : 'x\([^=]*\)='`
+    # Reject names that are not valid shell variable names.
+    case $ac_envvar in #(
+      '' | [0-9]* | *[!_$as_cr_alnum]* )
+      as_fn_error $? "invalid variable name: \`$ac_envvar'" ;;
+    esac
+    eval $ac_envvar=\$ac_optarg
+    export $ac_envvar ;;
+
+  *)
+    # FIXME: should be removed in autoconf 3.0.
+    $as_echo "$as_me: WARNING: you should use --build, --host, --target" >&2
+    expr "x$ac_option" : ".*[^-._$as_cr_alnum]" >/dev/null &&
+      $as_echo "$as_me: WARNING: invalid host type: $ac_option" >&2
+    : "${build_alias=$ac_option} ${host_alias=$ac_option} ${target_alias=$ac_option}"
+    ;;
+
+  esac
+done
+
+if test -n "$ac_prev"; then
+  ac_option=--`echo $ac_prev | sed 's/_/-/g'`
+  as_fn_error $? "missing argument to $ac_option"
+fi
+
+if test -n "$ac_unrecognized_opts"; then
+  case $enable_option_checking in
+    no) ;;
+    fatal) as_fn_error $? "unrecognized options: $ac_unrecognized_opts" ;;
+    *)     $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2 ;;
+  esac
+fi
+
+# Check all directory arguments for consistency.
+for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
+		datadir sysconfdir sharedstatedir localstatedir includedir \
+		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
+		libdir localedir mandir runstatedir
+do
+  eval ac_val=\$$ac_var
+  # Remove trailing slashes.
+  case $ac_val in
+    */ )
+      ac_val=`expr "X$ac_val" : 'X\(.*[^/]\)' \| "X$ac_val" : 'X\(.*\)'`
+      eval $ac_var=\$ac_val;;
+  esac
+  # Be sure to have absolute directory names.
+  case $ac_val in
+    [\\/$]* | ?:[\\/]* )  continue;;
+    NONE | '' ) case $ac_var in *prefix ) continue;; esac;;
+  esac
+  as_fn_error $? "expected an absolute directory name for --$ac_var: $ac_val"
+done
+
+# There might be people who depend on the old broken behavior: `$host'
+# used to hold the argument of --host etc.
+# FIXME: To remove some day.
+build=$build_alias
+host=$host_alias
+target=$target_alias
+
+# FIXME: To remove some day.
+if test "x$host_alias" != x; then
+  if test "x$build_alias" = x; then
+    cross_compiling=maybe
+  elif test "x$build_alias" != "x$host_alias"; then
+    cross_compiling=yes
+  fi
+fi
+
+ac_tool_prefix=
+test -n "$host_alias" && ac_tool_prefix=$host_alias-
+
+test "$silent" = yes && exec 6>/dev/null
+
+
+ac_pwd=`pwd` && test -n "$ac_pwd" &&
+ac_ls_di=`ls -di .` &&
+ac_pwd_ls_di=`cd "$ac_pwd" && ls -di .` ||
+  as_fn_error $? "working directory cannot be determined"
+test "X$ac_ls_di" = "X$ac_pwd_ls_di" ||
+  as_fn_error $? "pwd does not report name of working directory"
+
+
+# Find the source files, if location was not specified.
+if test -z "$srcdir"; then
+  ac_srcdir_defaulted=yes
+  # Try the directory containing this script, then the parent directory.
+  ac_confdir=`$as_dirname -- "$as_myself" ||
+$as_expr X"$as_myself" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$as_myself" : 'X\(//\)[^/]' \| \
+	 X"$as_myself" : 'X\(//\)$' \| \
+	 X"$as_myself" : 'X\(/\)' \| . 2>/dev/null ||
+$as_echo X"$as_myself" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+  srcdir=$ac_confdir
+  if test ! -r "$srcdir/$ac_unique_file"; then
+    srcdir=..
+  fi
+else
+  ac_srcdir_defaulted=no
+fi
+if test ! -r "$srcdir/$ac_unique_file"; then
+  test "$ac_srcdir_defaulted" = yes && srcdir="$ac_confdir or .."
+  as_fn_error $? "cannot find sources ($ac_unique_file) in $srcdir"
+fi
+ac_msg="sources are in $srcdir, but \`cd $srcdir' does not work"
+ac_abs_confdir=`(
+	cd "$srcdir" && test -r "./$ac_unique_file" || as_fn_error $? "$ac_msg"
+	pwd)`
+# When building in place, set srcdir=.
+if test "$ac_abs_confdir" = "$ac_pwd"; then
+  srcdir=.
+fi
+# Remove unnecessary trailing slashes from srcdir.
+# Double slashes in file names in object file debugging info
+# mess up M-x gdb in Emacs.
+case $srcdir in
+*/) srcdir=`expr "X$srcdir" : 'X\(.*[^/]\)' \| "X$srcdir" : 'X\(.*\)'`;;
+esac
+for ac_var in $ac_precious_vars; do
+  eval ac_env_${ac_var}_set=\${${ac_var}+set}
+  eval ac_env_${ac_var}_value=\$${ac_var}
+  eval ac_cv_env_${ac_var}_set=\${${ac_var}+set}
+  eval ac_cv_env_${ac_var}_value=\$${ac_var}
+done
+
+#
+# Report the --help message.
+#
+if test "$ac_init_help" = "long"; then
+  # Omit some internal or obsolete options to make the list less imposing.
+  # This message is too long to be a string in the A/UX 3.1 sh.
+  cat <<_ACEOF
+\`configure' configures this package to adapt to many kinds of systems.
+
+Usage: $0 [OPTION]... [VAR=VALUE]...
+
+To assign environment variables (e.g., CC, CFLAGS...), specify them as
+VAR=VALUE.  See below for descriptions of some of the useful variables.
+
+Defaults for the options are specified in brackets.
+
+Configuration:
+  -h, --help              display this help and exit
+      --help=short        display options specific to this package
+      --help=recursive    display the short help of all the included packages
+  -V, --version           display version information and exit
+  -q, --quiet, --silent   do not print \`checking ...' messages
+      --cache-file=FILE   cache test results in FILE [disabled]
+  -C, --config-cache      alias for \`--cache-file=config.cache'
+  -n, --no-create         do not create output files
+      --srcdir=DIR        find the sources in DIR [configure dir or \`..']
+
+Installation directories:
+  --prefix=PREFIX         install architecture-independent files in PREFIX
+                          [$ac_default_prefix]
+  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
+                          [PREFIX]
+
+By default, \`make install' will install all the files in
+\`$ac_default_prefix/bin', \`$ac_default_prefix/lib' etc.  You can specify
+an installation prefix other than \`$ac_default_prefix' using \`--prefix',
+for instance \`--prefix=\$HOME'.
+
+For better control, use the options below.
+
+Fine tuning of the installation directories:
+  --bindir=DIR            user executables [EPREFIX/bin]
+  --sbindir=DIR           system admin executables [EPREFIX/sbin]
+  --libexecdir=DIR        program executables [EPREFIX/libexec]
+  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
+  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
+  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
+  --libdir=DIR            object code libraries [EPREFIX/lib]
+  --includedir=DIR        C header files [PREFIX/include]
+  --oldincludedir=DIR     C header files for non-gcc [/usr/include]
+  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
+  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
+  --infodir=DIR           info documentation [DATAROOTDIR/info]
+  --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
+  --mandir=DIR            man documentation [DATAROOTDIR/man]
+  --docdir=DIR            documentation root [DATAROOTDIR/doc/PACKAGE]
+  --htmldir=DIR           html documentation [DOCDIR]
+  --dvidir=DIR            dvi documentation [DOCDIR]
+  --pdfdir=DIR            pdf documentation [DOCDIR]
+  --psdir=DIR             ps documentation [DOCDIR]
+_ACEOF
+
+  cat <<\_ACEOF
+
+System types:
+  --build=BUILD     configure for building on BUILD [guessed]
+  --host=HOST       cross-compile to build programs to run on HOST [BUILD]
+_ACEOF
+fi
+
+if test -n "$ac_init_help"; then
+
+  cat <<\_ACEOF
+
+Optional Packages:
+  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
+  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
+  --with-localdirs        Explicitly ask compiler to use /usr/local/{include,libs} if they exist
+  --with-libpcap=DIR      Look for pcap headers in DIR/include.
+  --with-libpcap=included Always use version included with Nmap
+  --without-libpcap       Disable pcap functions.
+  --with-openssl=DIR      Use optional openssl libs and includes from
+                          [DIR]/lib/ and [DIR]/include/openssl/)
+  --with-libnbase=DIR     Look for nbase include/libs in DIR
+
+Some influential environment variables:
+  CC          C compiler command
+  CFLAGS      C compiler flags
+  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
+              nonstandard directory <lib dir>
+  LIBS        libraries to pass to the linker, e.g. -l<library>
+  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
+              you have headers in a nonstandard directory <include dir>
+  CPP         C preprocessor
+
+Use these variables to override the choices made by `configure' or to help
+it to find libraries and programs with nonstandard names/locations.
+
+Report bugs to the package provider.
+_ACEOF
+ac_status=$?
+fi
+
+if test "$ac_init_help" = "recursive"; then
+  # If there are subdirs, report their specific --help.
+  for ac_dir in : $ac_subdirs_all; do test "x$ac_dir" = x: && continue
+    test -d "$ac_dir" ||
+      { cd "$srcdir" && ac_pwd=`pwd` && srcdir=. && test -d "$ac_dir"; } ||
+      continue
+    ac_builddir=.
+
+case "$ac_dir" in
+.) ac_dir_suffix= ac_top_builddir_sub=. ac_top_build_prefix= ;;
+*)
+  ac_dir_suffix=/`$as_echo "$ac_dir" | sed 's|^\.[\\/]||'`
+  # A ".." for each directory in $ac_dir_suffix.
+  ac_top_builddir_sub=`$as_echo "$ac_dir_suffix" | sed 's|/[^\\/]*|/..|g;s|/||'`
+  case $ac_top_builddir_sub in
+  "") ac_top_builddir_sub=. ac_top_build_prefix= ;;
+  *)  ac_top_build_prefix=$ac_top_builddir_sub/ ;;
+  esac ;;
+esac
+ac_abs_top_builddir=$ac_pwd
+ac_abs_builddir=$ac_pwd$ac_dir_suffix
+# for backward compatibility:
+ac_top_builddir=$ac_top_build_prefix
+
+case $srcdir in
+  .)  # We are building in place.
+    ac_srcdir=.
+    ac_top_srcdir=$ac_top_builddir_sub
+    ac_abs_top_srcdir=$ac_pwd ;;
+  [\\/]* | ?:[\\/]* )  # Absolute name.
+    ac_srcdir=$srcdir$ac_dir_suffix;
+    ac_top_srcdir=$srcdir
+    ac_abs_top_srcdir=$srcdir ;;
+  *) # Relative name.
+    ac_srcdir=$ac_top_build_prefix$srcdir$ac_dir_suffix
+    ac_top_srcdir=$ac_top_build_prefix$srcdir
+    ac_abs_top_srcdir=$ac_pwd/$srcdir ;;
+esac
+ac_abs_srcdir=$ac_abs_top_srcdir$ac_dir_suffix
+
+    cd "$ac_dir" || { ac_status=$?; continue; }
+    # Check for guested configure.
+    if test -f "$ac_srcdir/configure.gnu"; then
+      echo &&
+      $SHELL "$ac_srcdir/configure.gnu" --help=recursive
+    elif test -f "$ac_srcdir/configure"; then
+      echo &&
+      $SHELL "$ac_srcdir/configure" --help=recursive
+    else
+      $as_echo "$as_me: WARNING: no configuration information is in $ac_dir" >&2
+    fi || ac_status=$?
+    cd "$ac_pwd" || { ac_status=$?; break; }
+  done
+fi
+
+test -n "$ac_init_help" && exit $ac_status
+if $ac_init_version; then
+  cat <<\_ACEOF
+configure
+generated by GNU Autoconf 2.69
+
+Copyright (C) 2012 Free Software Foundation, Inc.
+This configure script is free software; the Free Software Foundation
+gives unlimited permission to copy, distribute and modify it.
+_ACEOF
+  exit
+fi
+
+## ------------------------ ##
+## Autoconf initialization. ##
+## ------------------------ ##
+
+# ac_fn_c_try_compile LINENO
+# --------------------------
+# Try to compile conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_compile ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  rm -f conftest.$ac_objext
+  if { { ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_compile") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_retval=1
+fi
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_compile
+
+# ac_fn_c_try_cpp LINENO
+# ----------------------
+# Try to preprocess conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_cpp ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if { { ac_try="$ac_cpp conftest.$ac_ext"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } > conftest.i && {
+	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+    ac_retval=1
+fi
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_cpp
+
+# ac_fn_c_check_header_mongrel LINENO HEADER VAR INCLUDES
+# -------------------------------------------------------
+# Tests whether HEADER exists, giving a warning if it cannot be compiled using
+# the include files in INCLUDES and setting the cache variable VAR
+# accordingly.
+ac_fn_c_check_header_mongrel ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if eval \${$3+:} false; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+else
+  # Is the header compilable?
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking $2 usability" >&5
+$as_echo_n "checking $2 usability... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_header_compiler=yes
+else
+  ac_header_compiler=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_header_compiler" >&5
+$as_echo "$ac_header_compiler" >&6; }
+
+# Is the header present?
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking $2 presence" >&5
+$as_echo_n "checking $2 presence... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <$2>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  ac_header_preproc=yes
+else
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_header_preproc" >&5
+$as_echo "$ac_header_preproc" >&6; }
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in #((
+  yes:no: )
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: accepted by the compiler, rejected by the preprocessor!" >&5
+$as_echo "$as_me: WARNING: $2: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: proceeding with the compiler's result" >&5
+$as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
+    ;;
+  no:yes:* )
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: present but cannot be compiled" >&5
+$as_echo "$as_me: WARNING: $2: present but cannot be compiled" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2:     check for missing prerequisite headers?" >&5
+$as_echo "$as_me: WARNING: $2:     check for missing prerequisite headers?" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: see the Autoconf documentation" >&5
+$as_echo "$as_me: WARNING: $2: see the Autoconf documentation" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2:     section \"Present But Cannot Be Compiled\"" >&5
+$as_echo "$as_me: WARNING: $2:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: proceeding with the compiler's result" >&5
+$as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
+    ;;
+esac
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  eval "$3=\$ac_header_compiler"
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+fi
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_header_mongrel
+
+# ac_fn_c_try_run LINENO
+# ----------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded. Assumes
+# that executables *can* be run.
+ac_fn_c_try_run ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && { ac_try='./conftest$ac_exeext'
+  { { case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: program exited with status $ac_status" >&5
+       $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+       ac_retval=$ac_status
+fi
+  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_run
+
+# ac_fn_c_check_header_compile LINENO HEADER VAR INCLUDES
+# -------------------------------------------------------
+# Tests whether HEADER exists and can be compiled using the include files in
+# INCLUDES, setting the cache variable VAR accordingly.
+ac_fn_c_check_header_compile ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_header_compile
+
+# ac_fn_c_try_link LINENO
+# -----------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_link ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  rm -f conftest.$ac_objext conftest$ac_exeext
+  if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 test -x conftest$ac_exeext
+       }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_retval=1
+fi
+  # Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
+  # created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
+  # interfere with the next link command; also delete a directory that is
+  # left behind by Apple's compiler.  We do this before executing the actions.
+  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_link
+
+# ac_fn_c_check_func LINENO FUNC VAR
+# ----------------------------------
+# Tests whether FUNC exists, setting the cache variable VAR accordingly
+ac_fn_c_check_func ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+/* Define $2 to an innocuous variant, in case <limits.h> declares $2.
+   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
+#define $2 innocuous_$2
+
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $2 (); below.
+    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+    <limits.h> exists even on freestanding compilers.  */
+
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+
+#undef $2
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char $2 ();
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined __stub_$2 || defined __stub___$2
+choke me
+#endif
+
+int
+main ()
+{
+return $2 ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_func
+cat >config.log <<_ACEOF
+This file contains any messages produced by compilers while
+running configure, to aid debugging if configure makes a mistake.
+
+It was created by $as_me, which was
+generated by GNU Autoconf 2.69.  Invocation command line was
+
+  $ $0 $@
+
+_ACEOF
+exec 5>>config.log
+{
+cat <<_ASUNAME
+## --------- ##
+## Platform. ##
+## --------- ##
+
+hostname = `(hostname || uname -n) 2>/dev/null | sed 1q`
+uname -m = `(uname -m) 2>/dev/null || echo unknown`
+uname -r = `(uname -r) 2>/dev/null || echo unknown`
+uname -s = `(uname -s) 2>/dev/null || echo unknown`
+uname -v = `(uname -v) 2>/dev/null || echo unknown`
+
+/usr/bin/uname -p = `(/usr/bin/uname -p) 2>/dev/null || echo unknown`
+/bin/uname -X     = `(/bin/uname -X) 2>/dev/null     || echo unknown`
+
+/bin/arch              = `(/bin/arch) 2>/dev/null              || echo unknown`
+/usr/bin/arch -k       = `(/usr/bin/arch -k) 2>/dev/null       || echo unknown`
+/usr/convex/getsysinfo = `(/usr/convex/getsysinfo) 2>/dev/null || echo unknown`
+/usr/bin/hostinfo      = `(/usr/bin/hostinfo) 2>/dev/null      || echo unknown`
+/bin/machine           = `(/bin/machine) 2>/dev/null           || echo unknown`
+/usr/bin/oslevel       = `(/usr/bin/oslevel) 2>/dev/null       || echo unknown`
+/bin/universe          = `(/bin/universe) 2>/dev/null          || echo unknown`
+
+_ASUNAME
+
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    $as_echo "PATH: $as_dir"
+  done
+IFS=$as_save_IFS
+
+} >&5
+
+cat >&5 <<_ACEOF
+
+
+## ----------- ##
+## Core tests. ##
+## ----------- ##
+
+_ACEOF
+
+
+# Keep a trace of the command line.
+# Strip out --no-create and --no-recursion so they do not pile up.
+# Strip out --silent because we don't want to record it for future runs.
+# Also quote any args containing shell meta-characters.
+# Make two passes to allow for proper duplicate-argument suppression.
+ac_configure_args=
+ac_configure_args0=
+ac_configure_args1=
+ac_must_keep_next=false
+for ac_pass in 1 2
+do
+  for ac_arg
+  do
+    case $ac_arg in
+    -no-create | --no-c* | -n | -no-recursion | --no-r*) continue ;;
+    -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+    | -silent | --silent | --silen | --sile | --sil)
+      continue ;;
+    *\'*)
+      ac_arg=`$as_echo "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;
+    esac
+    case $ac_pass in
+    1) as_fn_append ac_configure_args0 " '$ac_arg'" ;;
+    2)
+      as_fn_append ac_configure_args1 " '$ac_arg'"
+      if test $ac_must_keep_next = true; then
+	ac_must_keep_next=false # Got value, back to normal.
+      else
+	case $ac_arg in
+	  *=* | --config-cache | -C | -disable-* | --disable-* \
+	  | -enable-* | --enable-* | -gas | --g* | -nfp | --nf* \
+	  | -q | -quiet | --q* | -silent | --sil* | -v | -verb* \
+	  | -with-* | --with-* | -without-* | --without-* | --x)
+	    case "$ac_configure_args0 " in
+	      "$ac_configure_args1"*" '$ac_arg' "* ) continue ;;
+	    esac
+	    ;;
+	  -* ) ac_must_keep_next=true ;;
+	esac
+      fi
+      as_fn_append ac_configure_args " '$ac_arg'"
+      ;;
+    esac
+  done
+done
+{ ac_configure_args0=; unset ac_configure_args0;}
+{ ac_configure_args1=; unset ac_configure_args1;}
+
+# When interrupted or exit'd, cleanup temporary files, and complete
+# config.log.  We remove comments because anyway the quotes in there
+# would cause problems or look ugly.
+# WARNING: Use '\'' to represent an apostrophe within the trap.
+# WARNING: Do not start the trap code with a newline, due to a FreeBSD 4.0 bug.
+trap 'exit_status=$?
+  # Save into config.log some information that might help in debugging.
+  {
+    echo
+
+    $as_echo "## ---------------- ##
+## Cache variables. ##
+## ---------------- ##"
+    echo
+    # The following way of writing the cache mishandles newlines in values,
+(
+  for ac_var in `(set) 2>&1 | sed -n '\''s/^\([a-zA-Z_][a-zA-Z0-9_]*\)=.*/\1/p'\''`; do
+    eval ac_val=\$$ac_var
+    case $ac_val in #(
+    *${as_nl}*)
+      case $ac_var in #(
+      *_cv_*) { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: cache variable $ac_var contains a newline" >&5
+$as_echo "$as_me: WARNING: cache variable $ac_var contains a newline" >&2;} ;;
+      esac
+      case $ac_var in #(
+      _ | IFS | as_nl) ;; #(
+      BASH_ARGV | BASH_SOURCE) eval $ac_var= ;; #(
+      *) { eval $ac_var=; unset $ac_var;} ;;
+      esac ;;
+    esac
+  done
+  (set) 2>&1 |
+    case $as_nl`(ac_space='\'' '\''; set) 2>&1` in #(
+    *${as_nl}ac_space=\ *)
+      sed -n \
+	"s/'\''/'\''\\\\'\'''\''/g;
+	  s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1='\''\\2'\''/p"
+      ;; #(
+    *)
+      sed -n "/^[_$as_cr_alnum]*_cv_[_$as_cr_alnum]*=/p"
+      ;;
+    esac |
+    sort
+)
+    echo
+
+    $as_echo "## ----------------- ##
+## Output variables. ##
+## ----------------- ##"
+    echo
+    for ac_var in $ac_subst_vars
+    do
+      eval ac_val=\$$ac_var
+      case $ac_val in
+      *\'\''*) ac_val=`$as_echo "$ac_val" | sed "s/'\''/'\''\\\\\\\\'\'''\''/g"`;;
+      esac
+      $as_echo "$ac_var='\''$ac_val'\''"
+    done | sort
+    echo
+
+    if test -n "$ac_subst_files"; then
+      $as_echo "## ------------------- ##
+## File substitutions. ##
+## ------------------- ##"
+      echo
+      for ac_var in $ac_subst_files
+      do
+	eval ac_val=\$$ac_var
+	case $ac_val in
+	*\'\''*) ac_val=`$as_echo "$ac_val" | sed "s/'\''/'\''\\\\\\\\'\'''\''/g"`;;
+	esac
+	$as_echo "$ac_var='\''$ac_val'\''"
+      done | sort
+      echo
+    fi
+
+    if test -s confdefs.h; then
+      $as_echo "## ----------- ##
+## confdefs.h. ##
+## ----------- ##"
+      echo
+      cat confdefs.h
+      echo
+    fi
+    test "$ac_signal" != 0 &&
+      $as_echo "$as_me: caught signal $ac_signal"
+    $as_echo "$as_me: exit $exit_status"
+  } >&5
+  rm -f core *.core core.conftest.* &&
+    rm -f -r conftest* confdefs* conf$$* $ac_clean_files &&
+    exit $exit_status
+' 0
+for ac_signal in 1 2 13 15; do
+  trap 'ac_signal='$ac_signal'; as_fn_exit 1' $ac_signal
+done
+ac_signal=0
+
+# confdefs.h avoids OS command line length limits that DEFS can exceed.
+rm -f -r conftest* confdefs.h
+
+$as_echo "/* confdefs.h */" > confdefs.h
+
+# Predefined preprocessor variables.
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_NAME "$PACKAGE_NAME"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_TARNAME "$PACKAGE_TARNAME"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_VERSION "$PACKAGE_VERSION"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_STRING "$PACKAGE_STRING"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_BUGREPORT "$PACKAGE_BUGREPORT"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_URL "$PACKAGE_URL"
+_ACEOF
+
+
+# Let the site file select an alternate cache file if it wants to.
+# Prefer an explicitly selected file to automatically selected ones.
+ac_site_file1=NONE
+ac_site_file2=NONE
+if test -n "$CONFIG_SITE"; then
+  # We do not want a PATH search for config.site.
+  case $CONFIG_SITE in #((
+    -*)  ac_site_file1=./$CONFIG_SITE;;
+    */*) ac_site_file1=$CONFIG_SITE;;
+    *)   ac_site_file1=./$CONFIG_SITE;;
+  esac
+elif test "x$prefix" != xNONE; then
+  ac_site_file1=$prefix/share/config.site
+  ac_site_file2=$prefix/etc/config.site
+else
+  ac_site_file1=$ac_default_prefix/share/config.site
+  ac_site_file2=$ac_default_prefix/etc/config.site
+fi
+for ac_site_file in "$ac_site_file1" "$ac_site_file2"
+do
+  test "x$ac_site_file" = xNONE && continue
+  if test /dev/null != "$ac_site_file" && test -r "$ac_site_file"; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: loading site script $ac_site_file" >&5
+$as_echo "$as_me: loading site script $ac_site_file" >&6;}
+    sed 's/^/| /' "$ac_site_file" >&5
+    . "$ac_site_file" \
+      || { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "failed to load site script $ac_site_file
+See \`config.log' for more details" "$LINENO" 5; }
+  fi
+done
+
+if test -r "$cache_file"; then
+  # Some versions of bash will fail to source /dev/null (special files
+  # actually), so we avoid doing that.  DJGPP emulates it as a regular file.
+  if test /dev/null != "$cache_file" && test -f "$cache_file"; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: loading cache $cache_file" >&5
+$as_echo "$as_me: loading cache $cache_file" >&6;}
+    case $cache_file in
+      [\\/]* | ?:[\\/]* ) . "$cache_file";;
+      *)                      . "./$cache_file";;
+    esac
+  fi
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: creating cache $cache_file" >&5
+$as_echo "$as_me: creating cache $cache_file" >&6;}
+  >$cache_file
+fi
+
+# Check that the precious variables saved in the cache have kept the same
+# value.
+ac_cache_corrupted=false
+for ac_var in $ac_precious_vars; do
+  eval ac_old_set=\$ac_cv_env_${ac_var}_set
+  eval ac_new_set=\$ac_env_${ac_var}_set
+  eval ac_old_val=\$ac_cv_env_${ac_var}_value
+  eval ac_new_val=\$ac_env_${ac_var}_value
+  case $ac_old_set,$ac_new_set in
+    set,)
+      { $as_echo "$as_me:${as_lineno-$LINENO}: error: \`$ac_var' was set to \`$ac_old_val' in the previous run" >&5
+$as_echo "$as_me: error: \`$ac_var' was set to \`$ac_old_val' in the previous run" >&2;}
+      ac_cache_corrupted=: ;;
+    ,set)
+      { $as_echo "$as_me:${as_lineno-$LINENO}: error: \`$ac_var' was not set in the previous run" >&5
+$as_echo "$as_me: error: \`$ac_var' was not set in the previous run" >&2;}
+      ac_cache_corrupted=: ;;
+    ,);;
+    *)
+      if test "x$ac_old_val" != "x$ac_new_val"; then
+	# differences in whitespace do not lead to failure.
+	ac_old_val_w=`echo x $ac_old_val`
+	ac_new_val_w=`echo x $ac_new_val`
+	if test "$ac_old_val_w" != "$ac_new_val_w"; then
+	  { $as_echo "$as_me:${as_lineno-$LINENO}: error: \`$ac_var' has changed since the previous run:" >&5
+$as_echo "$as_me: error: \`$ac_var' has changed since the previous run:" >&2;}
+	  ac_cache_corrupted=:
+	else
+	  { $as_echo "$as_me:${as_lineno-$LINENO}: warning: ignoring whitespace changes in \`$ac_var' since the previous run:" >&5
+$as_echo "$as_me: warning: ignoring whitespace changes in \`$ac_var' since the previous run:" >&2;}
+	  eval $ac_var=\$ac_old_val
+	fi
+	{ $as_echo "$as_me:${as_lineno-$LINENO}:   former value:  \`$ac_old_val'" >&5
+$as_echo "$as_me:   former value:  \`$ac_old_val'" >&2;}
+	{ $as_echo "$as_me:${as_lineno-$LINENO}:   current value: \`$ac_new_val'" >&5
+$as_echo "$as_me:   current value: \`$ac_new_val'" >&2;}
+      fi;;
+  esac
+  # Pass precious variables to config.status.
+  if test "$ac_new_set" = set; then
+    case $ac_new_val in
+    *\'*) ac_arg=$ac_var=`$as_echo "$ac_new_val" | sed "s/'/'\\\\\\\\''/g"` ;;
+    *) ac_arg=$ac_var=$ac_new_val ;;
+    esac
+    case " $ac_configure_args " in
+      *" '$ac_arg' "*) ;; # Avoid dups.  Use of quotes ensures accuracy.
+      *) as_fn_append ac_configure_args " '$ac_arg'" ;;
+    esac
+  fi
+done
+if $ac_cache_corrupted; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+  { $as_echo "$as_me:${as_lineno-$LINENO}: error: changes in the environment can compromise the build" >&5
+$as_echo "$as_me: error: changes in the environment can compromise the build" >&2;}
+  as_fn_error $? "run \`make distclean' and/or \`rm $cache_file' and start over" "$LINENO" 5
+fi
+## -------------------- ##
+## Main body of script. ##
+## -------------------- ##
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+
+if test "${top_nmap_srcdir+set}" != set; then
+  top_nmap_srcdir=../..
+  export top_nmap_srcdir
+fi
+
+ac_config_files="$ac_config_files Makefile ../tests/Makefile"
+
+
+ac_config_headers="$ac_config_headers ../include/nsock_config.h"
+
+
+ac_aux_dir=
+for ac_dir in "$srcdir" "$srcdir/.." "$srcdir/../.."; do
+  if test -f "$ac_dir/install-sh"; then
+    ac_aux_dir=$ac_dir
+    ac_install_sh="$ac_aux_dir/install-sh -c"
+    break
+  elif test -f "$ac_dir/install.sh"; then
+    ac_aux_dir=$ac_dir
+    ac_install_sh="$ac_aux_dir/install.sh -c"
+    break
+  elif test -f "$ac_dir/shtool"; then
+    ac_aux_dir=$ac_dir
+    ac_install_sh="$ac_aux_dir/shtool install -c"
+    break
+  fi
+done
+if test -z "$ac_aux_dir"; then
+  as_fn_error $? "cannot find install-sh, install.sh, or shtool in \"$srcdir\" \"$srcdir/..\" \"$srcdir/../..\"" "$LINENO" 5
+fi
+
+# These three variables are undocumented and unsupported,
+# and are intended to be withdrawn in a future Autoconf release.
+# They can cause serious problems if a builder's source tree is in a directory
+# whose full name contains unusual characters.
+ac_config_guess="$SHELL $ac_aux_dir/config.guess"  # Please don't use this var.
+ac_config_sub="$SHELL $ac_aux_dir/config.sub"  # Please don't use this var.
+ac_configure="$SHELL $ac_aux_dir/configure"  # Please don't use this var.
+
+
+# Make sure we can run config.sub.
+$SHELL "$ac_aux_dir/config.sub" sun4 >/dev/null 2>&1 ||
+  as_fn_error $? "cannot run $SHELL $ac_aux_dir/config.sub" "$LINENO" 5
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking build system type" >&5
+$as_echo_n "checking build system type... " >&6; }
+if ${ac_cv_build+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_build_alias=$build_alias
+test "x$ac_build_alias" = x &&
+  ac_build_alias=`$SHELL "$ac_aux_dir/config.guess"`
+test "x$ac_build_alias" = x &&
+  as_fn_error $? "cannot guess build type; you must specify one" "$LINENO" 5
+ac_cv_build=`$SHELL "$ac_aux_dir/config.sub" $ac_build_alias` ||
+  as_fn_error $? "$SHELL $ac_aux_dir/config.sub $ac_build_alias failed" "$LINENO" 5
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_build" >&5
+$as_echo "$ac_cv_build" >&6; }
+case $ac_cv_build in
+*-*-*) ;;
+*) as_fn_error $? "invalid value of canonical build" "$LINENO" 5;;
+esac
+build=$ac_cv_build
+ac_save_IFS=$IFS; IFS='-'
+set x $ac_cv_build
+shift
+build_cpu=$1
+build_vendor=$2
+shift; shift
+# Remember, the first character of IFS is used to create $*,
+# except with old shells:
+build_os=$*
+IFS=$ac_save_IFS
+case $build_os in *\ *) build_os=`echo "$build_os" | sed 's/ /-/g'`;; esac
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking host system type" >&5
+$as_echo_n "checking host system type... " >&6; }
+if ${ac_cv_host+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test "x$host_alias" = x; then
+  ac_cv_host=$ac_cv_build
+else
+  ac_cv_host=`$SHELL "$ac_aux_dir/config.sub" $host_alias` ||
+    as_fn_error $? "$SHELL $ac_aux_dir/config.sub $host_alias failed" "$LINENO" 5
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_host" >&5
+$as_echo "$ac_cv_host" >&6; }
+case $ac_cv_host in
+*-*-*) ;;
+*) as_fn_error $? "invalid value of canonical host" "$LINENO" 5;;
+esac
+host=$ac_cv_host
+ac_save_IFS=$IFS; IFS='-'
+set x $ac_cv_host
+shift
+host_cpu=$1
+host_vendor=$2
+shift; shift
+# Remember, the first character of IFS is used to create $*,
+# except with old shells:
+host_os=$*
+IFS=$ac_save_IFS
+case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac
+
+
+
+
+
+
+case "$host" in
+  *alpha-dec-osf*)
+
+$as_echo "#define DEC 1" >>confdefs.h
+
+    ;;
+  *-netbsd* | *-knetbsd*-gnu)
+
+$as_echo "#define NETBSD 1" >>confdefs.h
+
+    ;;
+  *-openbsd*)
+
+$as_echo "#define OPENBSD 1" >>confdefs.h
+
+    ;;
+  *-sgi-irix5*)
+    $as_echo "#define IRIX 1" >>confdefs.h
+
+    ;;
+  *-sgi-irix6*)
+    $as_echo "#define IRIX 1" >>confdefs.h
+
+    ;;
+  *-hpux*)
+
+$as_echo "#define HPUX 1" >>confdefs.h
+
+    ;;
+  *-solaris2.1[1-9]*)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    # Solaris 11 and later use BPF packet capture rather than DLPI.
+
+$as_echo "#define SOLARIS_BPF_PCAP_CAPTURE 1" >>confdefs.h
+
+    ;;
+  *-solaris2.0*)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    ;;
+  *-solaris2.[1-9][0-9]*)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    ;;
+  *-solaris2.1*)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    ;;
+  *-solaris2.2*)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    ;;
+  *-solaris2.3*)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    ;;
+  *-solaris2.4*)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    ;;
+  *-solaris2.5.1)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    ;;
+  *-solaris*)
+    $as_echo "#define SOLARIS 1" >>confdefs.h
+
+    ;;
+  *-sunos4*)
+
+$as_echo "#define SUNOS 1" >>confdefs.h
+
+    ;;
+  *-linux*)
+
+$as_echo "#define LINUX 1" >>confdefs.h
+
+    ;;
+  *-freebsd* | *-kfreebsd*-gnu | *-dragonfly*)
+
+$as_echo "#define FREEBSD 1" >>confdefs.h
+
+    ;;
+  *-bsdi*)
+
+$as_echo "#define BSDI 1" >>confdefs.h
+
+    ;;
+  *-apple-darwin*)
+
+$as_echo "#define MACOSX 1" >>confdefs.h
+
+    ;;
+esac
+
+
+
+# Check whether --with-localdirs was given.
+if test "${with_localdirs+set}" = set; then :
+  withval=$with_localdirs;  case "$with_localdirs" in
+      yes)
+        user_localdirs=1
+        ;;
+      no)
+        user_localdirs=0
+        ;;
+    esac
+
+else
+   user_localdirs=0
+fi
+
+
+if test "$user_localdirs" = 1; then
+   if test -d /usr/local/lib; then
+     LDFLAGS="$LDFLAGS -L/usr/local/lib"
+     fi
+   if test -d /usr/local/include; then
+     CPPFLAGS="$CPPFLAGS -I/usr/local/include"
+   fi
+fi
+
+have_libpcap=no
+
+# By default, search for pcap library
+test "${with_libpcap+set}" != "set" && with_libpcap=yes
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}gcc", so it can be a program name with args.
+set dummy ${ac_tool_prefix}gcc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="${ac_tool_prefix}gcc"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_prog_CC"; then
+  ac_ct_CC=$CC
+  # Extract the first word of "gcc", so it can be a program name with args.
+set dummy gcc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$ac_ct_CC"; then
+  ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ac_ct_CC="gcc"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+$as_echo "$ac_ct_CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CC=$ac_ct_CC
+  fi
+else
+  CC="$ac_cv_prog_CC"
+fi
+
+if test -z "$CC"; then
+          if test -n "$ac_tool_prefix"; then
+    # Extract the first word of "${ac_tool_prefix}cc", so it can be a program name with args.
+set dummy ${ac_tool_prefix}cc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="${ac_tool_prefix}cc"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  fi
+fi
+if test -z "$CC"; then
+  # Extract the first word of "cc", so it can be a program name with args.
+set dummy cc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+  ac_prog_rejected=no
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    if test "$as_dir/$ac_word$ac_exec_ext" = "/usr/ucb/cc"; then
+       ac_prog_rejected=yes
+       continue
+     fi
+    ac_cv_prog_CC="cc"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+if test $ac_prog_rejected = yes; then
+  # We found a bogon in the path, so make sure we never use it.
+  set dummy $ac_cv_prog_CC
+  shift
+  if test $# != 0; then
+    # We chose a different compiler from the bogus one.
+    # However, it has the same basename, so the bogon will be chosen
+    # first if we set CC to just the basename; use the full file name.
+    shift
+    ac_cv_prog_CC="$as_dir/$ac_word${1+' '}$@"
+  fi
+fi
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$CC"; then
+  if test -n "$ac_tool_prefix"; then
+  for ac_prog in cl.exe
+  do
+    # Extract the first word of "$ac_tool_prefix$ac_prog", so it can be a program name with args.
+set dummy $ac_tool_prefix$ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="$ac_tool_prefix$ac_prog"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    test -n "$CC" && break
+  done
+fi
+if test -z "$CC"; then
+  ac_ct_CC=$CC
+  for ac_prog in cl.exe
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$ac_ct_CC"; then
+  ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ac_ct_CC="$ac_prog"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+$as_echo "$ac_ct_CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$ac_ct_CC" && break
+done
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CC=$ac_ct_CC
+  fi
+fi
+
+fi
+
+
+test -z "$CC" && { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "no acceptable C compiler found in \$PATH
+See \`config.log' for more details" "$LINENO" 5; }
+
+# Provide some information about the compiler.
+$as_echo "$as_me:${as_lineno-$LINENO}: checking for C compiler version" >&5
+set X $ac_compile
+ac_compiler=$2
+for ac_option in --version -v -V -qversion; do
+  { { ac_try="$ac_compiler $ac_option >&5"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_compiler $ac_option >&5") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    sed '10a\
+... rest of stderr output deleted ...
+         10q' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+  fi
+  rm -f conftest.er1 conftest.err
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+done
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+ac_clean_files_save=$ac_clean_files
+ac_clean_files="$ac_clean_files a.out a.out.dSYM a.exe b.out"
+# Try to create an executable without -o first, disregard a.out.
+# It will help us diagnose broken compilers, and finding out an intuition
+# of exeext.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the C compiler works" >&5
+$as_echo_n "checking whether the C compiler works... " >&6; }
+ac_link_default=`$as_echo "$ac_link" | sed 's/ -o *conftest[^ ]*//'`
+
+# The possible output files:
+ac_files="a.out conftest.exe conftest a.exe a_out.exe b.out conftest.*"
+
+ac_rmfiles=
+for ac_file in $ac_files
+do
+  case $ac_file in
+    *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj ) ;;
+    * ) ac_rmfiles="$ac_rmfiles $ac_file";;
+  esac
+done
+rm -f $ac_rmfiles
+
+if { { ac_try="$ac_link_default"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link_default") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then :
+  # Autoconf-2.13 could set the ac_cv_exeext variable to `no'.
+# So ignore a value of `no', otherwise this would lead to `EXEEXT = no'
+# in a Makefile.  We should not override ac_cv_exeext if it was cached,
+# so that the user can short-circuit this test for compilers unknown to
+# Autoconf.
+for ac_file in $ac_files ''
+do
+  test -f "$ac_file" || continue
+  case $ac_file in
+    *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj )
+	;;
+    [ab].out )
+	# We found the default executable, but exeext='' is most
+	# certainly right.
+	break;;
+    *.* )
+	if test "${ac_cv_exeext+set}" = set && test "$ac_cv_exeext" != no;
+	then :; else
+	   ac_cv_exeext=`expr "$ac_file" : '[^.]*\(\..*\)'`
+	fi
+	# We set ac_cv_exeext here because the later test for it is not
+	# safe: cross compilers may not add the suffix if given an `-o'
+	# argument, so we may need to know it at that point already.
+	# Even if this section looks crufty: it has the advantage of
+	# actually working.
+	break;;
+    * )
+	break;;
+  esac
+done
+test "$ac_cv_exeext" = no && ac_cv_exeext=
+
+else
+  ac_file=''
+fi
+if test -z "$ac_file"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+$as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error 77 "C compiler cannot create executables
+See \`config.log' for more details" "$LINENO" 5; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for C compiler default output file name" >&5
+$as_echo_n "checking for C compiler default output file name... " >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_file" >&5
+$as_echo "$ac_file" >&6; }
+ac_exeext=$ac_cv_exeext
+
+rm -f -r a.out a.out.dSYM a.exe conftest$ac_cv_exeext b.out
+ac_clean_files=$ac_clean_files_save
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for suffix of executables" >&5
+$as_echo_n "checking for suffix of executables... " >&6; }
+if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then :
+  # If both `conftest.exe' and `conftest' are `present' (well, observable)
+# catch `conftest.exe'.  For instance with Cygwin, `ls conftest' will
+# work properly (i.e., refer to `conftest.exe'), while it won't with
+# `rm'.
+for ac_file in conftest.exe conftest conftest.*; do
+  test -f "$ac_file" || continue
+  case $ac_file in
+    *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj ) ;;
+    *.* ) ac_cv_exeext=`expr "$ac_file" : '[^.]*\(\..*\)'`
+	  break;;
+    * ) break;;
+  esac
+done
+else
+  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot compute suffix of executables: cannot compile and link
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+rm -f conftest conftest$ac_cv_exeext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_exeext" >&5
+$as_echo "$ac_cv_exeext" >&6; }
+
+rm -f conftest.$ac_ext
+EXEEXT=$ac_cv_exeext
+ac_exeext=$EXEEXT
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdio.h>
+int
+main ()
+{
+FILE *f = fopen ("conftest.out", "w");
+ return ferror (f) || fclose (f) != 0;
+
+  ;
+  return 0;
+}
+_ACEOF
+ac_clean_files="$ac_clean_files conftest.out"
+# Check that the compiler produces executables we can run.  If not, either
+# the compiler is broken, or we cross compile.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are cross compiling" >&5
+$as_echo_n "checking whether we are cross compiling... " >&6; }
+if test "$cross_compiling" != yes; then
+  { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+  if { ac_try='./conftest$ac_cv_exeext'
+  { { case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+    cross_compiling=no
+  else
+    if test "$cross_compiling" = maybe; then
+	cross_compiling=yes
+    else
+	{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot run C compiled programs.
+If you meant to cross compile, use \`--host'.
+See \`config.log' for more details" "$LINENO" 5; }
+    fi
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $cross_compiling" >&5
+$as_echo "$cross_compiling" >&6; }
+
+rm -f conftest.$ac_ext conftest$ac_cv_exeext conftest.out
+ac_clean_files=$ac_clean_files_save
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for suffix of object files" >&5
+$as_echo_n "checking for suffix of object files... " >&6; }
+if ${ac_cv_objext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.o conftest.obj
+if { { ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_compile") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then :
+  for ac_file in conftest.o conftest.obj conftest.*; do
+  test -f "$ac_file" || continue;
+  case $ac_file in
+    *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM ) ;;
+    *) ac_cv_objext=`expr "$ac_file" : '.*\.\(.*\)'`
+       break;;
+  esac
+done
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot compute suffix of object files: cannot compile
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+rm -f conftest.$ac_cv_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_objext" >&5
+$as_echo "$ac_cv_objext" >&6; }
+OBJEXT=$ac_cv_objext
+ac_objext=$OBJEXT
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the GNU C compiler" >&5
+$as_echo_n "checking whether we are using the GNU C compiler... " >&6; }
+if ${ac_cv_c_compiler_gnu+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+#ifndef __GNUC__
+       choke me
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_compiler_gnu=yes
+else
+  ac_compiler_gnu=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ac_cv_c_compiler_gnu=$ac_compiler_gnu
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_compiler_gnu" >&5
+$as_echo "$ac_cv_c_compiler_gnu" >&6; }
+if test $ac_compiler_gnu = yes; then
+  GCC=yes
+else
+  GCC=
+fi
+ac_test_CFLAGS=${CFLAGS+set}
+ac_save_CFLAGS=$CFLAGS
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
+$as_echo_n "checking whether $CC accepts -g... " >&6; }
+if ${ac_cv_prog_cc_g+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_save_c_werror_flag=$ac_c_werror_flag
+   ac_c_werror_flag=yes
+   ac_cv_prog_cc_g=no
+   CFLAGS="-g"
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_prog_cc_g=yes
+else
+  CFLAGS=""
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+else
+  ac_c_werror_flag=$ac_save_c_werror_flag
+	 CFLAGS="-g"
+	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_prog_cc_g=yes
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+   ac_c_werror_flag=$ac_save_c_werror_flag
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_g" >&5
+$as_echo "$ac_cv_prog_cc_g" >&6; }
+if test "$ac_test_CFLAGS" = set; then
+  CFLAGS=$ac_save_CFLAGS
+elif test $ac_cv_prog_cc_g = yes; then
+  if test "$GCC" = yes; then
+    CFLAGS="-g -O2"
+  else
+    CFLAGS="-g"
+  fi
+else
+  if test "$GCC" = yes; then
+    CFLAGS="-O2"
+  else
+    CFLAGS=
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO C89" >&5
+$as_echo_n "checking for $CC option to accept ISO C89... " >&6; }
+if ${ac_cv_prog_cc_c89+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_cv_prog_cc_c89=no
+ac_save_CC=$CC
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdarg.h>
+#include <stdio.h>
+struct stat;
+/* Most of the following tests are stolen from RCS 5.7's src/conf.sh.  */
+struct buf { int x; };
+FILE * (*rcsopen) (struct buf *, struct stat *, int);
+static char *e (p, i)
+     char **p;
+     int i;
+{
+  return p[i];
+}
+static char *f (char * (*g) (char **, int), char **p, ...)
+{
+  char *s;
+  va_list v;
+  va_start (v,p);
+  s = g (p, va_arg (v,int));
+  va_end (v);
+  return s;
+}
+
+/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default.  It has
+   function prototypes and stuff, but not '\xHH' hex character constants.
+   These don't provoke an error unfortunately, instead are silently treated
+   as 'x'.  The following induces an error, until -std is added to get
+   proper ANSI mode.  Curiously '\x00'!='x' always comes out true, for an
+   array size at least.  It's necessary to write '\x00'==0 to get something
+   that's true only with -std.  */
+int osf4_cc_array ['\x00' == 0 ? 1 : -1];
+
+/* IBM C 6 for AIX is almost-ANSI by default, but it replaces macro parameters
+   inside strings and character constants.  */
+#define FOO(x) 'x'
+int xlc6_cc_array[FOO(a) == 'x' ? 1 : -1];
+
+int test (int i, double x);
+struct s1 {int (*f) (int a);};
+struct s2 {int (*f) (double a);};
+int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
+int argc;
+char **argv;
+int
+main ()
+{
+return f (e, argv, 0) != argv[0]  ||  f (e, argv, 1) != argv[1];
+  ;
+  return 0;
+}
+_ACEOF
+for ac_arg in '' -qlanglvl=extc89 -qlanglvl=ansi -std \
+	-Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
+do
+  CC="$ac_save_CC $ac_arg"
+  if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_prog_cc_c89=$ac_arg
+fi
+rm -f core conftest.err conftest.$ac_objext
+  test "x$ac_cv_prog_cc_c89" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC
+
+fi
+# AC_CACHE_VAL
+case "x$ac_cv_prog_cc_c89" in
+  x)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+$as_echo "none needed" >&6; } ;;
+  xno)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+$as_echo "unsupported" >&6; } ;;
+  *)
+    CC="$CC $ac_cv_prog_cc_c89"
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c89" >&5
+$as_echo "$ac_cv_prog_cc_c89" >&6; } ;;
+esac
+if test "x$ac_cv_prog_cc_c89" != xno; then :
+
+fi
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking how to run the C preprocessor" >&5
+$as_echo_n "checking how to run the C preprocessor... " >&6; }
+# On Suns, sometimes $CPP names a directory.
+if test -n "$CPP" && test -d "$CPP"; then
+  CPP=
+fi
+if test -z "$CPP"; then
+  if ${ac_cv_prog_CPP+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+      # Double quotes because CPP needs to be expanded
+    for CPP in "$CC -E" "$CC -E -traditional-cpp" "/lib/cpp"
+    do
+      ac_preproc_ok=false
+for ac_c_preproc_warn_flag in '' yes
+do
+  # Use a header file that comes with gcc, so configuring glibc
+  # with a fresh cross-compiler works.
+  # Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+  # <limits.h> exists even on freestanding compilers.
+  # On the NeXT, cc -E runs the code through the compiler's parser,
+  # not just through cpp. "Syntax error" is here to catch this case.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+		     Syntax error
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+
+else
+  # Broken: fails on valid input.
+continue
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+
+  # OK, works on sane cases.  Now check whether nonexistent headers
+  # can be detected and how.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ac_nonexistent.h>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  # Broken: success on invalid input.
+continue
+else
+  # Passes both tests.
+ac_preproc_ok=:
+break
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+
+done
+# Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
+rm -f conftest.i conftest.err conftest.$ac_ext
+if $ac_preproc_ok; then :
+  break
+fi
+
+    done
+    ac_cv_prog_CPP=$CPP
+
+fi
+  CPP=$ac_cv_prog_CPP
+else
+  ac_cv_prog_CPP=$CPP
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $CPP" >&5
+$as_echo "$CPP" >&6; }
+ac_preproc_ok=false
+for ac_c_preproc_warn_flag in '' yes
+do
+  # Use a header file that comes with gcc, so configuring glibc
+  # with a fresh cross-compiler works.
+  # Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+  # <limits.h> exists even on freestanding compilers.
+  # On the NeXT, cc -E runs the code through the compiler's parser,
+  # not just through cpp. "Syntax error" is here to catch this case.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+		     Syntax error
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+
+else
+  # Broken: fails on valid input.
+continue
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+
+  # OK, works on sane cases.  Now check whether nonexistent headers
+  # can be detected and how.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ac_nonexistent.h>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  # Broken: success on invalid input.
+continue
+else
+  # Passes both tests.
+ac_preproc_ok=:
+break
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+
+done
+# Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
+rm -f conftest.i conftest.err conftest.$ac_ext
+if $ac_preproc_ok; then :
+
+else
+  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "C preprocessor \"$CPP\" fails sanity check
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
+$as_echo_n "checking for grep that handles long lines and -e... " >&6; }
+if ${ac_cv_path_GREP+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -z "$GREP"; then
+  ac_path_GREP_found=false
+  # Loop through the user's path and test for each of PROGNAME-LIST
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_prog in grep ggrep; do
+    for ac_exec_ext in '' $ac_executable_extensions; do
+      ac_path_GREP="$as_dir/$ac_prog$ac_exec_ext"
+      as_fn_executable_p "$ac_path_GREP" || continue
+# Check for GNU ac_path_GREP and select it if it is found.
+  # Check for GNU $ac_path_GREP
+case `"$ac_path_GREP" --version 2>&1` in
+*GNU*)
+  ac_cv_path_GREP="$ac_path_GREP" ac_path_GREP_found=:;;
+*)
+  ac_count=0
+  $as_echo_n 0123456789 >"conftest.in"
+  while :
+  do
+    cat "conftest.in" "conftest.in" >"conftest.tmp"
+    mv "conftest.tmp" "conftest.in"
+    cp "conftest.in" "conftest.nl"
+    $as_echo 'GREP' >> "conftest.nl"
+    "$ac_path_GREP" -e 'GREP$' -e '-(cannot match)-' < "conftest.nl" >"conftest.out" 2>/dev/null || break
+    diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
+    as_fn_arith $ac_count + 1 && ac_count=$as_val
+    if test $ac_count -gt ${ac_path_GREP_max-0}; then
+      # Best one so far, save it but keep looking for a better one
+      ac_cv_path_GREP="$ac_path_GREP"
+      ac_path_GREP_max=$ac_count
+    fi
+    # 10*(2^10) chars as input seems more than enough
+    test $ac_count -gt 10 && break
+  done
+  rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
+esac
+
+      $ac_path_GREP_found && break 3
+    done
+  done
+  done
+IFS=$as_save_IFS
+  if test -z "$ac_cv_path_GREP"; then
+    as_fn_error $? "no acceptable grep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
+  fi
+else
+  ac_cv_path_GREP=$GREP
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5
+$as_echo "$ac_cv_path_GREP" >&6; }
+ GREP="$ac_cv_path_GREP"
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
+$as_echo_n "checking for egrep... " >&6; }
+if ${ac_cv_path_EGREP+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if echo a | $GREP -E '(a|b)' >/dev/null 2>&1
+   then ac_cv_path_EGREP="$GREP -E"
+   else
+     if test -z "$EGREP"; then
+  ac_path_EGREP_found=false
+  # Loop through the user's path and test for each of PROGNAME-LIST
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_prog in egrep; do
+    for ac_exec_ext in '' $ac_executable_extensions; do
+      ac_path_EGREP="$as_dir/$ac_prog$ac_exec_ext"
+      as_fn_executable_p "$ac_path_EGREP" || continue
+# Check for GNU ac_path_EGREP and select it if it is found.
+  # Check for GNU $ac_path_EGREP
+case `"$ac_path_EGREP" --version 2>&1` in
+*GNU*)
+  ac_cv_path_EGREP="$ac_path_EGREP" ac_path_EGREP_found=:;;
+*)
+  ac_count=0
+  $as_echo_n 0123456789 >"conftest.in"
+  while :
+  do
+    cat "conftest.in" "conftest.in" >"conftest.tmp"
+    mv "conftest.tmp" "conftest.in"
+    cp "conftest.in" "conftest.nl"
+    $as_echo 'EGREP' >> "conftest.nl"
+    "$ac_path_EGREP" 'EGREP$' < "conftest.nl" >"conftest.out" 2>/dev/null || break
+    diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
+    as_fn_arith $ac_count + 1 && ac_count=$as_val
+    if test $ac_count -gt ${ac_path_EGREP_max-0}; then
+      # Best one so far, save it but keep looking for a better one
+      ac_cv_path_EGREP="$ac_path_EGREP"
+      ac_path_EGREP_max=$ac_count
+    fi
+    # 10*(2^10) chars as input seems more than enough
+    test $ac_count -gt 10 && break
+  done
+  rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
+esac
+
+      $ac_path_EGREP_found && break 3
+    done
+  done
+  done
+IFS=$as_save_IFS
+  if test -z "$ac_cv_path_EGREP"; then
+    as_fn_error $? "no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
+  fi
+else
+  ac_cv_path_EGREP=$EGREP
+fi
+
+   fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5
+$as_echo "$ac_cv_path_EGREP" >&6; }
+ EGREP="$ac_cv_path_EGREP"
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
+$as_echo_n "checking for ANSI C header files... " >&6; }
+if ${ac_cv_header_stdc+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <float.h>
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_header_stdc=yes
+else
+  ac_cv_header_stdc=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+if test $ac_cv_header_stdc = yes; then
+  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <string.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "memchr" >/dev/null 2>&1; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "free" >/dev/null 2>&1; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
+  if test "$cross_compiling" = yes; then :
+  :
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ctype.h>
+#include <stdlib.h>
+#if ((' ' & 0x0FF) == 0x020)
+# define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+#else
+# define ISLOWER(c) \
+		   (('a' <= (c) && (c) <= 'i') \
+		     || ('j' <= (c) && (c) <= 'r') \
+		     || ('s' <= (c) && (c) <= 'z'))
+# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
+#endif
+
+#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+int
+main ()
+{
+  int i;
+  for (i = 0; i < 256; i++)
+    if (XOR (islower (i), ISLOWER (i))
+	|| toupper (i) != TOUPPER (i))
+      return 2;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_stdc" >&5
+$as_echo "$ac_cv_header_stdc" >&6; }
+if test $ac_cv_header_stdc = yes; then
+
+$as_echo "#define STDC_HEADERS 1" >>confdefs.h
+
+fi
+
+# On IRIX 5.3, sys/types and inttypes.h are conflicting.
+for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \
+		  inttypes.h stdint.h unistd.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default
+"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+
+
+# Check whether --with-libpcap was given.
+if test "${with_libpcap+set}" = set; then :
+  withval=$with_libpcap;   case "$with_libpcap" in
+  yes)
+    ac_fn_c_check_header_mongrel "$LINENO" "pcap.h" "ac_cv_header_pcap_h" "$ac_includes_default"
+if test "x$ac_cv_header_pcap_h" = xyes; then :
+
+      have_libpcap=yes
+      LIBPCAP_LIBS=-lpcap
+fi
+
+
+    ;;
+  included)
+    have_libpcap=no
+   ;;
+  no)
+    ;;
+  *)
+    _cppflags=$CPPFLAGS
+    _ldflags=$LDFLAGS
+
+    CPPFLAGS="-I$with_libpcap/include $CPPFLAGS"
+    LDFLAGS="-L$with_libpcap/lib $LDFLAGS"
+
+    ac_fn_c_check_header_mongrel "$LINENO" "pcap.h" "ac_cv_header_pcap_h" "$ac_includes_default"
+if test "x$ac_cv_header_pcap_h" = xyes; then :
+
+      { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pcap_create in -lpcap" >&5
+$as_echo_n "checking for pcap_create in -lpcap... " >&6; }
+if ${ac_cv_lib_pcap_pcap_create+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lpcap  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char pcap_create ();
+int
+main ()
+{
+return pcap_create ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_pcap_pcap_create=yes
+else
+  ac_cv_lib_pcap_pcap_create=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_pcap_pcap_create" >&5
+$as_echo "$ac_cv_lib_pcap_pcap_create" >&6; }
+if test "x$ac_cv_lib_pcap_pcap_create" = xyes; then :
+  have_libpcap=yes
+        LIBPCAP_LIBS=-lpcap
+        LIBPCAP_INC=$with_libpcap/include
+        LIBPCAP_LIB=$with_libpcap/lib
+fi
+
+fi
+
+
+
+    LDFLAGS=$_ldflags
+    CPPFLAGS=$_cppflags
+    ;;
+  esac
+
+fi
+
+
+if test "$with_libpcap" != "no" -a "$have_libpcap" = "no"; then
+  LIBPCAP_INC=${top_nmap_srcdir}/libpcap
+  LIBPCAP_LIB=${top_nmap_srcdir}/libpcap
+  LIBPCAP_LIBS=${LIBPCAP_LIB}/libpcap.a
+  have_libpcap=yes
+
+$as_echo "#define HAVE_PCAP_SET_IMMEDIATE_MODE 1" >>confdefs.h
+
+else
+  # link with -lpcap for the purposes of this test
+  LIBS_OLD="$LIBS"
+  LIBS="$LIBS -lpcap"
+  for ac_func in pcap_set_immediate_mode
+do :
+  ac_fn_c_check_func "$LINENO" "pcap_set_immediate_mode" "ac_cv_func_pcap_set_immediate_mode"
+if test "x$ac_cv_func_pcap_set_immediate_mode" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_PCAP_SET_IMMEDIATE_MODE 1
+_ACEOF
+
+fi
+done
+
+  # Restore libs
+  LIBS="$LIBS_OLD"
+fi
+
+if test "$have_libpcap" != "no"; then
+
+$as_echo "#define HAVE_PCAP 1" >>confdefs.h
+
+  if test "${LIBPCAP_INC+set}" = "set"; then
+    CPPFLAGS="-I$LIBPCAP_INC $CPPFLAGS"
+    LDFLAGS="-L$LIBPCAP_LIB $LDFLAGS"
+  fi
+fi
+
+
+  ax_have_epoll_cppflags="${CPPFLAGS}"
+  ac_fn_c_check_header_mongrel "$LINENO" "linux/version.h" "ac_cv_header_linux_version_h" "$ac_includes_default"
+if test "x$ac_cv_header_linux_version_h" = xyes; then :
+  CPPFLAGS="${CPPFLAGS} -DHAVE_LINUX_VERSION_H"
+fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for Linux epoll(7) interface" >&5
+$as_echo_n "checking for Linux epoll(7) interface... " >&6; }
+  if ${ax_cv_have_epoll+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+      #include <sys/epoll.h>
+#ifdef HAVE_LINUX_VERSION_H
+#  include <linux/version.h>
+#  if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,45)
+#    error linux kernel version is too old to have epoll
+#  endif
+#endif
+
+int
+main ()
+{
+int fd, rc;
+struct epoll_event ev;
+fd = epoll_create(128);
+rc = epoll_wait(fd, &ev, 1, 0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ax_cv_have_epoll=yes
+else
+  ax_cv_have_epoll=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+
+  CPPFLAGS="${ax_have_epoll_cppflags}"
+  if test "${ax_cv_have_epoll}" = "yes"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+
+$as_echo "#define HAVE_EPOLL 1" >>confdefs.h
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for poll(2)" >&5
+$as_echo_n "checking for poll(2)... " >&6; }
+  if ${ax_cv_have_poll+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+      #include <poll.h>
+int
+main ()
+{
+int rc; rc = poll((struct pollfd *)(0), 0, 0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ax_cv_have_poll=yes
+else
+  ax_cv_have_poll=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+
+  if test "${ax_cv_have_poll}" = "yes"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+
+$as_echo "#define HAVE_POLL 1" >>confdefs.h
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+
+for ac_func in kqueue kevent
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+ $as_echo "#define HAVE_KQUEUE 1" >>confdefs.h
+
+fi
+done
+
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}gcc", so it can be a program name with args.
+set dummy ${ac_tool_prefix}gcc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="${ac_tool_prefix}gcc"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_prog_CC"; then
+  ac_ct_CC=$CC
+  # Extract the first word of "gcc", so it can be a program name with args.
+set dummy gcc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$ac_ct_CC"; then
+  ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ac_ct_CC="gcc"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+$as_echo "$ac_ct_CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CC=$ac_ct_CC
+  fi
+else
+  CC="$ac_cv_prog_CC"
+fi
+
+if test -z "$CC"; then
+          if test -n "$ac_tool_prefix"; then
+    # Extract the first word of "${ac_tool_prefix}cc", so it can be a program name with args.
+set dummy ${ac_tool_prefix}cc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="${ac_tool_prefix}cc"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  fi
+fi
+if test -z "$CC"; then
+  # Extract the first word of "cc", so it can be a program name with args.
+set dummy cc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+  ac_prog_rejected=no
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    if test "$as_dir/$ac_word$ac_exec_ext" = "/usr/ucb/cc"; then
+       ac_prog_rejected=yes
+       continue
+     fi
+    ac_cv_prog_CC="cc"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+if test $ac_prog_rejected = yes; then
+  # We found a bogon in the path, so make sure we never use it.
+  set dummy $ac_cv_prog_CC
+  shift
+  if test $# != 0; then
+    # We chose a different compiler from the bogus one.
+    # However, it has the same basename, so the bogon will be chosen
+    # first if we set CC to just the basename; use the full file name.
+    shift
+    ac_cv_prog_CC="$as_dir/$ac_word${1+' '}$@"
+  fi
+fi
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$CC"; then
+  if test -n "$ac_tool_prefix"; then
+  for ac_prog in cl.exe
+  do
+    # Extract the first word of "$ac_tool_prefix$ac_prog", so it can be a program name with args.
+set dummy $ac_tool_prefix$ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="$ac_tool_prefix$ac_prog"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    test -n "$CC" && break
+  done
+fi
+if test -z "$CC"; then
+  ac_ct_CC=$CC
+  for ac_prog in cl.exe
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$ac_ct_CC"; then
+  ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ac_ct_CC="$ac_prog"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+$as_echo "$ac_ct_CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$ac_ct_CC" && break
+done
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CC=$ac_ct_CC
+  fi
+fi
+
+fi
+
+
+test -z "$CC" && { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "no acceptable C compiler found in \$PATH
+See \`config.log' for more details" "$LINENO" 5; }
+
+# Provide some information about the compiler.
+$as_echo "$as_me:${as_lineno-$LINENO}: checking for C compiler version" >&5
+set X $ac_compile
+ac_compiler=$2
+for ac_option in --version -v -V -qversion; do
+  { { ac_try="$ac_compiler $ac_option >&5"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_compiler $ac_option >&5") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    sed '10a\
+... rest of stderr output deleted ...
+         10q' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+  fi
+  rm -f conftest.er1 conftest.err
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+done
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the GNU C compiler" >&5
+$as_echo_n "checking whether we are using the GNU C compiler... " >&6; }
+if ${ac_cv_c_compiler_gnu+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+#ifndef __GNUC__
+       choke me
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_compiler_gnu=yes
+else
+  ac_compiler_gnu=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ac_cv_c_compiler_gnu=$ac_compiler_gnu
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_compiler_gnu" >&5
+$as_echo "$ac_cv_c_compiler_gnu" >&6; }
+if test $ac_compiler_gnu = yes; then
+  GCC=yes
+else
+  GCC=
+fi
+ac_test_CFLAGS=${CFLAGS+set}
+ac_save_CFLAGS=$CFLAGS
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
+$as_echo_n "checking whether $CC accepts -g... " >&6; }
+if ${ac_cv_prog_cc_g+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_save_c_werror_flag=$ac_c_werror_flag
+   ac_c_werror_flag=yes
+   ac_cv_prog_cc_g=no
+   CFLAGS="-g"
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_prog_cc_g=yes
+else
+  CFLAGS=""
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+else
+  ac_c_werror_flag=$ac_save_c_werror_flag
+	 CFLAGS="-g"
+	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_prog_cc_g=yes
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+   ac_c_werror_flag=$ac_save_c_werror_flag
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_g" >&5
+$as_echo "$ac_cv_prog_cc_g" >&6; }
+if test "$ac_test_CFLAGS" = set; then
+  CFLAGS=$ac_save_CFLAGS
+elif test $ac_cv_prog_cc_g = yes; then
+  if test "$GCC" = yes; then
+    CFLAGS="-g -O2"
+  else
+    CFLAGS="-g"
+  fi
+else
+  if test "$GCC" = yes; then
+    CFLAGS="-O2"
+  else
+    CFLAGS=
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO C89" >&5
+$as_echo_n "checking for $CC option to accept ISO C89... " >&6; }
+if ${ac_cv_prog_cc_c89+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_cv_prog_cc_c89=no
+ac_save_CC=$CC
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdarg.h>
+#include <stdio.h>
+struct stat;
+/* Most of the following tests are stolen from RCS 5.7's src/conf.sh.  */
+struct buf { int x; };
+FILE * (*rcsopen) (struct buf *, struct stat *, int);
+static char *e (p, i)
+     char **p;
+     int i;
+{
+  return p[i];
+}
+static char *f (char * (*g) (char **, int), char **p, ...)
+{
+  char *s;
+  va_list v;
+  va_start (v,p);
+  s = g (p, va_arg (v,int));
+  va_end (v);
+  return s;
+}
+
+/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default.  It has
+   function prototypes and stuff, but not '\xHH' hex character constants.
+   These don't provoke an error unfortunately, instead are silently treated
+   as 'x'.  The following induces an error, until -std is added to get
+   proper ANSI mode.  Curiously '\x00'!='x' always comes out true, for an
+   array size at least.  It's necessary to write '\x00'==0 to get something
+   that's true only with -std.  */
+int osf4_cc_array ['\x00' == 0 ? 1 : -1];
+
+/* IBM C 6 for AIX is almost-ANSI by default, but it replaces macro parameters
+   inside strings and character constants.  */
+#define FOO(x) 'x'
+int xlc6_cc_array[FOO(a) == 'x' ? 1 : -1];
+
+int test (int i, double x);
+struct s1 {int (*f) (int a);};
+struct s2 {int (*f) (double a);};
+int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
+int argc;
+char **argv;
+int
+main ()
+{
+return f (e, argv, 0) != argv[0]  ||  f (e, argv, 1) != argv[1];
+  ;
+  return 0;
+}
+_ACEOF
+for ac_arg in '' -qlanglvl=extc89 -qlanglvl=ansi -std \
+	-Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
+do
+  CC="$ac_save_CC $ac_arg"
+  if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_prog_cc_c89=$ac_arg
+fi
+rm -f core conftest.err conftest.$ac_objext
+  test "x$ac_cv_prog_cc_c89" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC
+
+fi
+# AC_CACHE_VAL
+case "x$ac_cv_prog_cc_c89" in
+  x)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+$as_echo "none needed" >&6; } ;;
+  xno)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+$as_echo "unsupported" >&6; } ;;
+  *)
+    CC="$CC $ac_cv_prog_cc_c89"
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c89" >&5
+$as_echo "$ac_cv_prog_cc_c89" >&6; } ;;
+esac
+if test "x$ac_cv_prog_cc_c89" != xno; then :
+
+fi
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+ if test -n "$GCC"; then
+      CFLAGS="$CFLAGS -Wall "
+ fi
+if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}ranlib", so it can be a program name with args.
+set dummy ${ac_tool_prefix}ranlib; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_RANLIB+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$RANLIB"; then
+  ac_cv_prog_RANLIB="$RANLIB" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_RANLIB="${ac_tool_prefix}ranlib"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+RANLIB=$ac_cv_prog_RANLIB
+if test -n "$RANLIB"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $RANLIB" >&5
+$as_echo "$RANLIB" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_prog_RANLIB"; then
+  ac_ct_RANLIB=$RANLIB
+  # Extract the first word of "ranlib", so it can be a program name with args.
+set dummy ranlib; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_ac_ct_RANLIB+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$ac_ct_RANLIB"; then
+  ac_cv_prog_ac_ct_RANLIB="$ac_ct_RANLIB" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ac_ct_RANLIB="ranlib"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+ac_ct_RANLIB=$ac_cv_prog_ac_ct_RANLIB
+if test -n "$ac_ct_RANLIB"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_RANLIB" >&5
+$as_echo "$ac_ct_RANLIB" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+  if test "x$ac_ct_RANLIB" = x; then
+    RANLIB=":"
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    RANLIB=$ac_ct_RANLIB
+  fi
+else
+  RANLIB="$ac_cv_prog_RANLIB"
+fi
+
+
+
+ac_fn_c_check_func "$LINENO" "gethostent" "ac_cv_func_gethostent"
+if test "x$ac_cv_func_gethostent" = xyes; then :
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gethostent in -lnsl" >&5
+$as_echo_n "checking for gethostent in -lnsl... " >&6; }
+if ${ac_cv_lib_nsl_gethostent+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnsl  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char gethostent ();
+int
+main ()
+{
+return gethostent ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nsl_gethostent=yes
+else
+  ac_cv_lib_nsl_gethostent=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nsl_gethostent" >&5
+$as_echo "$ac_cv_lib_nsl_gethostent" >&6; }
+if test "x$ac_cv_lib_nsl_gethostent" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSL 1
+_ACEOF
+
+  LIBS="-lnsl $LIBS"
+
+fi
+
+fi
+
+ac_fn_c_check_func "$LINENO" "setsockopt" "ac_cv_func_setsockopt"
+if test "x$ac_cv_func_setsockopt" = xyes; then :
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for setsockopt in -lsocket" >&5
+$as_echo_n "checking for setsockopt in -lsocket... " >&6; }
+if ${ac_cv_lib_socket_setsockopt+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lsocket  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char setsockopt ();
+int
+main ()
+{
+return setsockopt ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_socket_setsockopt=yes
+else
+  ac_cv_lib_socket_setsockopt=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_socket_setsockopt" >&5
+$as_echo "$ac_cv_lib_socket_setsockopt" >&6; }
+if test "x$ac_cv_lib_socket_setsockopt" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSOCKET 1
+_ACEOF
+
+  LIBS="-lsocket $LIBS"
+
+fi
+
+fi
+
+
+ac_fn_c_check_func "$LINENO" "nanosleep" "ac_cv_func_nanosleep"
+if test "x$ac_cv_func_nanosleep" = xyes; then :
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for nanosleep in -lposix4" >&5
+$as_echo_n "checking for nanosleep in -lposix4... " >&6; }
+if ${ac_cv_lib_posix4_nanosleep+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lposix4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char nanosleep ();
+int
+main ()
+{
+return nanosleep ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_posix4_nanosleep=yes
+else
+  ac_cv_lib_posix4_nanosleep=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_posix4_nanosleep" >&5
+$as_echo "$ac_cv_lib_posix4_nanosleep" >&6; }
+if test "x$ac_cv_lib_posix4_nanosleep" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBPOSIX4 1
+_ACEOF
+
+  LIBS="-lposix4 $LIBS"
+
+fi
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
+$as_echo_n "checking for ANSI C header files... " >&6; }
+if ${ac_cv_header_stdc+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <float.h>
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_header_stdc=yes
+else
+  ac_cv_header_stdc=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+if test $ac_cv_header_stdc = yes; then
+  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <string.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "memchr" >/dev/null 2>&1; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "free" >/dev/null 2>&1; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
+  if test "$cross_compiling" = yes; then :
+  :
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ctype.h>
+#include <stdlib.h>
+#if ((' ' & 0x0FF) == 0x020)
+# define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+#else
+# define ISLOWER(c) \
+		   (('a' <= (c) && (c) <= 'i') \
+		     || ('j' <= (c) && (c) <= 'r') \
+		     || ('s' <= (c) && (c) <= 'z'))
+# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
+#endif
+
+#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+int
+main ()
+{
+  int i;
+  for (i = 0; i < 256; i++)
+    if (XOR (islower (i), ISLOWER (i))
+	|| toupper (i) != TOUPPER (i))
+      return 2;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_stdc" >&5
+$as_echo "$ac_cv_header_stdc" >&6; }
+if test $ac_cv_header_stdc = yes; then
+
+$as_echo "#define STDC_HEADERS 1" >>confdefs.h
+
+fi
+
+for ac_header in net/bpf.h sys/ioctl.h sys/un.h netdb.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+for ac_header in linux/vm_sockets.h
+do :
+  ac_fn_c_check_header_compile "$LINENO" "linux/vm_sockets.h" "ac_cv_header_linux_vm_sockets_h" "#include <sys/socket.h>
+"
+if test "x$ac_cv_header_linux_vm_sockets_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LINUX_VM_SOCKETS_H 1
+_ACEOF
+
+fi
+
+done
+
+
+# We test whether they specified openssl desires explicitly
+use_openssl="yes"
+specialssldir=""
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;   case "$with_openssl" in
+  yes)
+    ;;
+  no)
+    use_openssl="no"
+    ;;
+  *)
+    specialssldir="$with_openssl"
+    CPPFLAGS="$CPPFLAGS -I$with_openssl/include"
+    LDFLAGS="$LDFLAGS -L$with_openssl/lib"
+    ;;
+  esac
+
+fi
+
+
+# If they didn't specify it, we try to find it
+if test "$use_openssl" = "yes" -a -z "$specialssldir"; then
+  ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
+
+else
+   use_openssl="no"
+    if test "$with_openssl" = "yes"; then
+      as_fn_error $? "OpenSSL was explicitly requested but openssl/ssl.h was not found. Try the --with-openssl=DIR argument to give the location of OpenSSL or run configure with --without-openssl." "$LINENO" 5
+    fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Failed to find openssl/ssl.h so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument" >&5
+$as_echo "$as_me: WARNING: Failed to find openssl/ssl.h so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument" >&2;}
+
+fi
+
+
+
+# use_openssl="yes" given explicitly in next 2 rules to avoid adding lib to $LIBS
+ if test "$use_openssl" = "yes"; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for BIO_int_ctrl in -lcrypto" >&5
+$as_echo_n "checking for BIO_int_ctrl in -lcrypto... " >&6; }
+if ${ac_cv_lib_crypto_BIO_int_ctrl+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lcrypto  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char BIO_int_ctrl ();
+int
+main ()
+{
+return BIO_int_ctrl ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_crypto_BIO_int_ctrl=yes
+else
+  ac_cv_lib_crypto_BIO_int_ctrl=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_crypto_BIO_int_ctrl" >&5
+$as_echo "$ac_cv_lib_crypto_BIO_int_ctrl" >&6; }
+if test "x$ac_cv_lib_crypto_BIO_int_ctrl" = xyes; then :
+   use_openssl="yes"
+else
+   use_openssl="no"
+    if test "$with_openssl" = "yes"; then
+      as_fn_error $? "OpenSSL was explicitly requested but libcrypto was not found. Try the --with-openssl=DIR argument to give the location of OpenSSL or run configure with --without-openssl." "$LINENO" 5
+    fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Failed to find libcrypto so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument" >&5
+$as_echo "$as_me: WARNING: Failed to find libcrypto so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument" >&2;}
+
+fi
+
+ fi
+
+ if test "$use_openssl" = "yes"; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_new in -lssl" >&5
+$as_echo_n "checking for SSL_new in -lssl... " >&6; }
+if ${ac_cv_lib_ssl_SSL_new+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl  -lcrypto  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_new ();
+int
+main ()
+{
+return SSL_new ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl_SSL_new=yes
+else
+  ac_cv_lib_ssl_SSL_new=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl_SSL_new" >&5
+$as_echo "$ac_cv_lib_ssl_SSL_new" >&6; }
+if test "x$ac_cv_lib_ssl_SSL_new" = xyes; then :
+   use_openssl="yes"
+else
+   use_openssl="no"
+    if test "$with_openssl" = "yes"; then
+      as_fn_error $? "OpenSSL was explicitly requested but libssl was not found. Try the --with-openssl=DIR argument to give the location of OpenSSL or run configure with --without-openssl." "$LINENO" 5
+    fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Failed to find libssl so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument" >&5
+$as_echo "$as_me: WARNING: Failed to find libssl so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument" >&2;}
+fi
+
+ fi
+fi
+
+# OpenSSL requires dlopen on some platforms
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing dlopen" >&5
+$as_echo_n "checking for library containing dlopen... " >&6; }
+if ${ac_cv_search_dlopen+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char dlopen ();
+int
+main ()
+{
+return dlopen ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' dl; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_dlopen=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_dlopen+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_dlopen+:} false; then :
+
+else
+  ac_cv_search_dlopen=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_dlopen" >&5
+$as_echo "$ac_cv_search_dlopen" >&6; }
+ac_res=$ac_cv_search_dlopen
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+fi
+
+
+OPENSSL_LIBS=
+if test "$use_openssl" = "yes"; then
+
+$as_echo "#define HAVE_OPENSSL 1" >>confdefs.h
+
+  OPENSSL_LIBS="-lssl -lcrypto"
+  LIBS_TMP="$LIBS"
+  LIBS="$OPENSSL_LIBS $LIBS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_set_tlsext_host_name" >&5
+$as_echo_n "checking for SSL_set_tlsext_host_name... " >&6; }
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <openssl/ssl.h>
+int
+main ()
+{
+SSL_set_tlsext_host_name(NULL, NULL)
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+$as_echo "#define HAVE_SSL_SET_TLSEXT_HOST_NAME 1" >>confdefs.h
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for DTLS_client_method" >&5
+$as_echo_n "checking for DTLS_client_method... " >&6; }
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <openssl/ssl.h>
+int
+main ()
+{
+DTLS_client_method()
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+$as_echo "#define HAVE_DTLS_CLIENT_METHOD 1" >>confdefs.h
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_set_alpn_protos" >&5
+$as_echo_n "checking for SSL_set_alpn_protos... " >&6; }
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <openssl/ssl.h>
+int
+main ()
+{
+SSL_set_alpn_protos(NULL, NULL, 0)
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+$as_echo "#define HAVE_ALPN_SUPPORT 1" >>confdefs.h
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+  LIBS="$LIBS_TMP"
+
+fi
+
+
+
+
+
+# Check whether --with-libnbase was given.
+if test "${with_libnbase+set}" = set; then :
+  withval=$with_libnbase;   case "$with_libnbase" in
+  yes)
+    ;;
+  *)
+    NBASEDIR="$with_libnbase"
+    ;;
+  esac
+else
+  NBASEDIR="${top_nmap_srcdir}/nbase"
+
+fi
+
+
+NSOCKTESTDIR="../tests"
+
+LDFLAGS="$LDFLAGS -L$NBASEDIR"
+CPPFLAGS="$CPPFLAGS -I$NBASEDIR"
+LIBNBASE_LIBS="$LIBS -lnbase"
+
+
+
+
+
+
+
+cat >confcache <<\_ACEOF
+# This file is a shell script that caches the results of configure
+# tests run on this system so they can be shared between configure
+# scripts and configure runs, see configure's option --config-cache.
+# It is not useful on other systems.  If it contains results you don't
+# want to keep, you may remove or edit it.
+#
+# config.status only pays attention to the cache file if you give it
+# the --recheck option to rerun configure.
+#
+# `ac_cv_env_foo' variables (set or unset) will be overridden when
+# loading this file, other *unset* `ac_cv_foo' will be assigned the
+# following values.
+
+_ACEOF
+
+# The following way of writing the cache mishandles newlines in values,
+# but we know of no workaround that is simple, portable, and efficient.
+# So, we kill variables containing newlines.
+# Ultrix sh set writes to stderr and can't be redirected directly,
+# and sets the high bit in the cache file unless we assign to the vars.
+(
+  for ac_var in `(set) 2>&1 | sed -n 's/^\([a-zA-Z_][a-zA-Z0-9_]*\)=.*/\1/p'`; do
+    eval ac_val=\$$ac_var
+    case $ac_val in #(
+    *${as_nl}*)
+      case $ac_var in #(
+      *_cv_*) { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: cache variable $ac_var contains a newline" >&5
+$as_echo "$as_me: WARNING: cache variable $ac_var contains a newline" >&2;} ;;
+      esac
+      case $ac_var in #(
+      _ | IFS | as_nl) ;; #(
+      BASH_ARGV | BASH_SOURCE) eval $ac_var= ;; #(
+      *) { eval $ac_var=; unset $ac_var;} ;;
+      esac ;;
+    esac
+  done
+
+  (set) 2>&1 |
+    case $as_nl`(ac_space=' '; set) 2>&1` in #(
+    *${as_nl}ac_space=\ *)
+      # `set' does not quote correctly, so add quotes: double-quote
+      # substitution turns \\\\ into \\, and sed turns \\ into \.
+      sed -n \
+	"s/'/'\\\\''/g;
+	  s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1='\\2'/p"
+      ;; #(
+    *)
+      # `set' quotes correctly as required by POSIX, so do not add quotes.
+      sed -n "/^[_$as_cr_alnum]*_cv_[_$as_cr_alnum]*=/p"
+      ;;
+    esac |
+    sort
+) |
+  sed '
+     /^ac_cv_env_/b end
+     t clear
+     :clear
+     s/^\([^=]*\)=\(.*[{}].*\)$/test "${\1+set}" = set || &/
+     t end
+     s/^\([^=]*\)=\(.*\)$/\1=${\1=\2}/
+     :end' >>confcache
+if diff "$cache_file" confcache >/dev/null 2>&1; then :; else
+  if test -w "$cache_file"; then
+    if test "x$cache_file" != "x/dev/null"; then
+      { $as_echo "$as_me:${as_lineno-$LINENO}: updating cache $cache_file" >&5
+$as_echo "$as_me: updating cache $cache_file" >&6;}
+      if test ! -f "$cache_file" || test -h "$cache_file"; then
+	cat confcache >"$cache_file"
+      else
+        case $cache_file in #(
+        */* | ?:*)
+	  mv -f confcache "$cache_file"$$ &&
+	  mv -f "$cache_file"$$ "$cache_file" ;; #(
+        *)
+	  mv -f confcache "$cache_file" ;;
+	esac
+      fi
+    fi
+  else
+    { $as_echo "$as_me:${as_lineno-$LINENO}: not updating unwritable cache $cache_file" >&5
+$as_echo "$as_me: not updating unwritable cache $cache_file" >&6;}
+  fi
+fi
+rm -f confcache
+
+test "x$prefix" = xNONE && prefix=$ac_default_prefix
+# Let make expand exec_prefix.
+test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
+
+DEFS=-DHAVE_CONFIG_H
+
+ac_libobjs=
+ac_ltlibobjs=
+U=
+for ac_i in : $LIBOBJS; do test "x$ac_i" = x: && continue
+  # 1. Remove the extension, and $U if already installed.
+  ac_script='s/\$U\././;s/\.o$//;s/\.obj$//'
+  ac_i=`$as_echo "$ac_i" | sed "$ac_script"`
+  # 2. Prepend LIBOBJDIR.  When used with automake>=1.10 LIBOBJDIR
+  #    will be set to the directory where LIBOBJS objects are built.
+  as_fn_append ac_libobjs " \${LIBOBJDIR}$ac_i\$U.$ac_objext"
+  as_fn_append ac_ltlibobjs " \${LIBOBJDIR}$ac_i"'$U.lo'
+done
+LIBOBJS=$ac_libobjs
+
+LTLIBOBJS=$ac_ltlibobjs
+
+
+
+: "${CONFIG_STATUS=./config.status}"
+ac_write_fail=0
+ac_clean_files_save=$ac_clean_files
+ac_clean_files="$ac_clean_files $CONFIG_STATUS"
+{ $as_echo "$as_me:${as_lineno-$LINENO}: creating $CONFIG_STATUS" >&5
+$as_echo "$as_me: creating $CONFIG_STATUS" >&6;}
+as_write_fail=0
+cat >$CONFIG_STATUS <<_ASEOF || as_write_fail=1
+#! $SHELL
+# Generated by $as_me.
+# Run this file to recreate the current configuration.
+# Compiler output produced by configure, useful for debugging
+# configure, is in config.log if it exists.
+
+debug=false
+ac_cs_recheck=false
+ac_cs_silent=false
+
+SHELL=\${CONFIG_SHELL-$SHELL}
+export SHELL
+_ASEOF
+cat >>$CONFIG_STATUS <<\_ASEOF || as_write_fail=1
+## -------------------- ##
+## M4sh Initialization. ##
+## -------------------- ##
+
+# Be more Bourne compatible
+DUALCASE=1; export DUALCASE # for MKS sh
+if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then :
+  emulate sh
+  NULLCMD=:
+  # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which
+  # is contrary to our usage.  Disable this feature.
+  alias -g '${1+"$@"}'='"$@"'
+  setopt NO_GLOB_SUBST
+else
+  case `(set -o) 2>/dev/null` in #(
+  *posix*) :
+    set -o posix ;; #(
+  *) :
+     ;;
+esac
+fi
+
+
+as_nl='
+'
+export as_nl
+# Printing a long string crashes Solaris 7 /usr/bin/printf.
+as_echo='\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'
+as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo
+as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo$as_echo
+# Prefer a ksh shell builtin over an external printf program on Solaris,
+# but without wasting forks for bash or zsh.
+if test -z "$BASH_VERSION$ZSH_VERSION" \
+    && (test "X`print -r -- $as_echo`" = "X$as_echo") 2>/dev/null; then
+  as_echo='print -r --'
+  as_echo_n='print -rn --'
+elif (test "X`printf %s $as_echo`" = "X$as_echo") 2>/dev/null; then
+  as_echo='printf %s\n'
+  as_echo_n='printf %s'
+else
+  if test "X`(/usr/ucb/echo -n -n $as_echo) 2>/dev/null`" = "X-n $as_echo"; then
+    as_echo_body='eval /usr/ucb/echo -n "$1$as_nl"'
+    as_echo_n='/usr/ucb/echo -n'
+  else
+    as_echo_body='eval expr "X$1" : "X\\(.*\\)"'
+    as_echo_n_body='eval
+      arg=$1;
+      case $arg in #(
+      *"$as_nl"*)
+	expr "X$arg" : "X\\(.*\\)$as_nl";
+	arg=`expr "X$arg" : ".*$as_nl\\(.*\\)"`;;
+      esac;
+      expr "X$arg" : "X\\(.*\\)" | tr -d "$as_nl"
+    '
+    export as_echo_n_body
+    as_echo_n='sh -c $as_echo_n_body as_echo'
+  fi
+  export as_echo_body
+  as_echo='sh -c $as_echo_body as_echo'
+fi
+
+# The user is always right.
+if test "${PATH_SEPARATOR+set}" != set; then
+  PATH_SEPARATOR=:
+  (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 && {
+    (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 ||
+      PATH_SEPARATOR=';'
+  }
+fi
+
+
+# IFS
+# We need space, tab and new line, in precisely that order.  Quoting is
+# there to prevent editors from complaining about space-tab.
+# (If _AS_PATH_WALK were called with IFS unset, it would disable word
+# splitting by setting IFS to empty value.)
+IFS=" ""	$as_nl"
+
+# Find who we are.  Look in the path if we contain no directory separator.
+as_myself=
+case $0 in #((
+  *[\\/]* ) as_myself=$0 ;;
+  *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    test -r "$as_dir/$0" && as_myself=$as_dir/$0 && break
+  done
+IFS=$as_save_IFS
+
+     ;;
+esac
+# We did not find ourselves, most probably we were run as `sh COMMAND'
+# in which case we are not to be found in the path.
+if test "x$as_myself" = x; then
+  as_myself=$0
+fi
+if test ! -f "$as_myself"; then
+  $as_echo "$as_myself: error: cannot find myself; rerun with an absolute file name" >&2
+  exit 1
+fi
+
+# Unset variables that we do not need and which cause bugs (e.g. in
+# pre-3.0 UWIN ksh).  But do not cause bugs in bash 2.01; the "|| exit 1"
+# suppresses any "Segmentation fault" message there.  '((' could
+# trigger a bug in pdksh 5.2.14.
+for as_var in BASH_ENV ENV MAIL MAILPATH
+do eval test x\${$as_var+set} = xset \
+  && ( (unset $as_var) || exit 1) >/dev/null 2>&1 && unset $as_var || :
+done
+PS1='$ '
+PS2='> '
+PS4='+ '
+
+# NLS nuisances.
+LC_ALL=C
+export LC_ALL
+LANGUAGE=C
+export LANGUAGE
+
+# CDPATH.
+(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
+
+
+# as_fn_error STATUS ERROR [LINENO LOG_FD]
+# ----------------------------------------
+# Output "`basename $0`: error: ERROR" to stderr. If LINENO and LOG_FD are
+# provided, also output the error to LOG_FD, referencing LINENO. Then exit the
+# script with STATUS, using 1 if that was 0.
+as_fn_error ()
+{
+  as_status=$1; test $as_status -eq 0 && as_status=1
+  if test "$4"; then
+    as_lineno=${as_lineno-"$3"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+    $as_echo "$as_me:${as_lineno-$LINENO}: error: $2" >&$4
+  fi
+  $as_echo "$as_me: error: $2" >&2
+  as_fn_exit $as_status
+} # as_fn_error
+
+
+# as_fn_set_status STATUS
+# -----------------------
+# Set $? to STATUS, without forking.
+as_fn_set_status ()
+{
+  return $1
+} # as_fn_set_status
+
+# as_fn_exit STATUS
+# -----------------
+# Exit the shell with STATUS, even in a "trap 0" or "set -e" context.
+as_fn_exit ()
+{
+  set +e
+  as_fn_set_status $1
+  exit $1
+} # as_fn_exit
+
+# as_fn_unset VAR
+# ---------------
+# Portably unset VAR.
+as_fn_unset ()
+{
+  { eval $1=; unset $1;}
+}
+as_unset=as_fn_unset
+# as_fn_append VAR VALUE
+# ----------------------
+# Append the text in VALUE to the end of the definition contained in VAR. Take
+# advantage of any shell optimizations that allow amortized linear growth over
+# repeated appends, instead of the typical quadratic growth present in naive
+# implementations.
+if (eval "as_var=1; as_var+=2; test x\$as_var = x12") 2>/dev/null; then :
+  eval 'as_fn_append ()
+  {
+    eval $1+=\$2
+  }'
+else
+  as_fn_append ()
+  {
+    eval $1=\$$1\$2
+  }
+fi # as_fn_append
+
+# as_fn_arith ARG...
+# ------------------
+# Perform arithmetic evaluation on the ARGs, and store the result in the
+# global $as_val. Take advantage of shells that can avoid forks. The arguments
+# must be portable across $(()) and expr.
+if (eval "test \$(( 1 + 1 )) = 2") 2>/dev/null; then :
+  eval 'as_fn_arith ()
+  {
+    as_val=$(( $* ))
+  }'
+else
+  as_fn_arith ()
+  {
+    as_val=`expr "$@" || test $? -eq 1`
+  }
+fi # as_fn_arith
+
+
+if expr a : '\(a\)' >/dev/null 2>&1 &&
+   test "X`expr 00001 : '.*\(...\)'`" = X001; then
+  as_expr=expr
+else
+  as_expr=false
+fi
+
+if (basename -- /) >/dev/null 2>&1 && test "X`basename -- / 2>&1`" = "X/"; then
+  as_basename=basename
+else
+  as_basename=false
+fi
+
+if (as_dir=`dirname -- /` && test "X$as_dir" = X/) >/dev/null 2>&1; then
+  as_dirname=dirname
+else
+  as_dirname=false
+fi
+
+as_me=`$as_basename -- "$0" ||
+$as_expr X/"$0" : '.*/\([^/][^/]*\)/*$' \| \
+	 X"$0" : 'X\(//\)$' \| \
+	 X"$0" : 'X\(/\)' \| . 2>/dev/null ||
+$as_echo X/"$0" |
+    sed '/^.*\/\([^/][^/]*\)\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+
+# Avoid depending upon Character Ranges.
+as_cr_letters='abcdefghijklmnopqrstuvwxyz'
+as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+as_cr_Letters=$as_cr_letters$as_cr_LETTERS
+as_cr_digits='0123456789'
+as_cr_alnum=$as_cr_Letters$as_cr_digits
+
+ECHO_C= ECHO_N= ECHO_T=
+case `echo -n x` in #(((((
+-n*)
+  case `echo 'xy\c'` in
+  *c*) ECHO_T='	';;	# ECHO_T is single tab character.
+  xy)  ECHO_C='\c';;
+  *)   echo `echo ksh88 bug on AIX 6.1` > /dev/null
+       ECHO_T='	';;
+  esac;;
+*)
+  ECHO_N='-n';;
+esac
+
+rm -f conf$$ conf$$.exe conf$$.file
+if test -d conf$$.dir; then
+  rm -f conf$$.dir/conf$$.file
+else
+  rm -f conf$$.dir
+  mkdir conf$$.dir 2>/dev/null
+fi
+if (echo >conf$$.file) 2>/dev/null; then
+  if ln -s conf$$.file conf$$ 2>/dev/null; then
+    as_ln_s='ln -s'
+    # ... but there are two gotchas:
+    # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
+    # 2) DJGPP < 2.04 has no symlinks; `ln -s' creates a wrapper executable.
+    # In both cases, we have to default to `cp -pR'.
+    ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
+      as_ln_s='cp -pR'
+  elif ln conf$$.file conf$$ 2>/dev/null; then
+    as_ln_s=ln
+  else
+    as_ln_s='cp -pR'
+  fi
+else
+  as_ln_s='cp -pR'
+fi
+rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
+rmdir conf$$.dir 2>/dev/null
+
+
+# as_fn_mkdir_p
+# -------------
+# Create "$as_dir" as a directory, including parents if necessary.
+as_fn_mkdir_p ()
+{
+
+  case $as_dir in #(
+  -*) as_dir=./$as_dir;;
+  esac
+  test -d "$as_dir" || eval $as_mkdir_p || {
+    as_dirs=
+    while :; do
+      case $as_dir in #(
+      *\'*) as_qdir=`$as_echo "$as_dir" | sed "s/'/'\\\\\\\\''/g"`;; #'(
+      *) as_qdir=$as_dir;;
+      esac
+      as_dirs="'$as_qdir' $as_dirs"
+      as_dir=`$as_dirname -- "$as_dir" ||
+$as_expr X"$as_dir" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$as_dir" : 'X\(//\)[^/]' \| \
+	 X"$as_dir" : 'X\(//\)$' \| \
+	 X"$as_dir" : 'X\(/\)' \| . 2>/dev/null ||
+$as_echo X"$as_dir" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+      test -d "$as_dir" && break
+    done
+    test -z "$as_dirs" || eval "mkdir $as_dirs"
+  } || test -d "$as_dir" || as_fn_error $? "cannot create directory $as_dir"
+
+
+} # as_fn_mkdir_p
+if mkdir -p . 2>/dev/null; then
+  as_mkdir_p='mkdir -p "$as_dir"'
+else
+  test -d ./-p && rmdir ./-p
+  as_mkdir_p=false
+fi
+
+
+# as_fn_executable_p FILE
+# -----------------------
+# Test if FILE is an executable regular file.
+as_fn_executable_p ()
+{
+  test -f "$1" && test -x "$1"
+} # as_fn_executable_p
+as_test_x='test -x'
+as_executable_p=as_fn_executable_p
+
+# Sed expression to map a string onto a valid CPP name.
+as_tr_cpp="eval sed 'y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g'"
+
+# Sed expression to map a string onto a valid variable name.
+as_tr_sh="eval sed 'y%*+%pp%;s%[^_$as_cr_alnum]%_%g'"
+
+
+exec 6>&1
+## ----------------------------------- ##
+## Main body of $CONFIG_STATUS script. ##
+## ----------------------------------- ##
+_ASEOF
+test $as_write_fail = 0 && chmod +x $CONFIG_STATUS || ac_write_fail=1
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+# Save the log message, to keep $0 and so on meaningful, and to
+# report actual input values of CONFIG_FILES etc. instead of their
+# values after options handling.
+ac_log="
+This file was extended by $as_me, which was
+generated by GNU Autoconf 2.69.  Invocation command line was
+
+  CONFIG_FILES    = $CONFIG_FILES
+  CONFIG_HEADERS  = $CONFIG_HEADERS
+  CONFIG_LINKS    = $CONFIG_LINKS
+  CONFIG_COMMANDS = $CONFIG_COMMANDS
+  $ $0 $@
+
+on `(hostname || uname -n) 2>/dev/null | sed 1q`
+"
+
+_ACEOF
+
+case $ac_config_files in *"
+"*) set x $ac_config_files; shift; ac_config_files=$*;;
+esac
+
+case $ac_config_headers in *"
+"*) set x $ac_config_headers; shift; ac_config_headers=$*;;
+esac
+
+
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+# Files that config.status was made for.
+config_files="$ac_config_files"
+config_headers="$ac_config_headers"
+
+_ACEOF
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+ac_cs_usage="\
+\`$as_me' instantiates files and other configuration actions
+from templates according to the current configuration.  Unless the files
+and actions are specified as TAGs, all are instantiated by default.
+
+Usage: $0 [OPTION]... [TAG]...
+
+  -h, --help       print this help, then exit
+  -V, --version    print version number and configuration settings, then exit
+      --config     print configuration, then exit
+  -q, --quiet, --silent
+                   do not print progress messages
+  -d, --debug      don't remove temporary files
+      --recheck    update $as_me by reconfiguring in the same conditions
+      --file=FILE[:TEMPLATE]
+                   instantiate the configuration file FILE
+      --header=FILE[:TEMPLATE]
+                   instantiate the configuration header FILE
+
+Configuration files:
+$config_files
+
+Configuration headers:
+$config_headers
+
+Report bugs to the package provider."
+
+_ACEOF
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
+ac_cs_version="\\
+config.status
+configured by $0, generated by GNU Autoconf 2.69,
+  with options \\"\$ac_cs_config\\"
+
+Copyright (C) 2012 Free Software Foundation, Inc.
+This config.status script is free software; the Free Software Foundation
+gives unlimited permission to copy, distribute and modify it."
+
+ac_pwd='$ac_pwd'
+srcdir='$srcdir'
+test -n "\$AWK" || AWK=awk
+_ACEOF
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+# The default lists apply if the user does not specify any file.
+ac_need_defaults=:
+while test $# != 0
+do
+  case $1 in
+  --*=?*)
+    ac_option=`expr "X$1" : 'X\([^=]*\)='`
+    ac_optarg=`expr "X$1" : 'X[^=]*=\(.*\)'`
+    ac_shift=:
+    ;;
+  --*=)
+    ac_option=`expr "X$1" : 'X\([^=]*\)='`
+    ac_optarg=
+    ac_shift=:
+    ;;
+  *)
+    ac_option=$1
+    ac_optarg=$2
+    ac_shift=shift
+    ;;
+  esac
+
+  case $ac_option in
+  # Handling of the options.
+  -recheck | --recheck | --rechec | --reche | --rech | --rec | --re | --r)
+    ac_cs_recheck=: ;;
+  --version | --versio | --versi | --vers | --ver | --ve | --v | -V )
+    $as_echo "$ac_cs_version"; exit ;;
+  --config | --confi | --conf | --con | --co | --c )
+    $as_echo "$ac_cs_config"; exit ;;
+  --debug | --debu | --deb | --de | --d | -d )
+    debug=: ;;
+  --file | --fil | --fi | --f )
+    $ac_shift
+    case $ac_optarg in
+    *\'*) ac_optarg=`$as_echo "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"` ;;
+    '') as_fn_error $? "missing file argument" ;;
+    esac
+    as_fn_append CONFIG_FILES " '$ac_optarg'"
+    ac_need_defaults=false;;
+  --header | --heade | --head | --hea )
+    $ac_shift
+    case $ac_optarg in
+    *\'*) ac_optarg=`$as_echo "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"` ;;
+    esac
+    as_fn_append CONFIG_HEADERS " '$ac_optarg'"
+    ac_need_defaults=false;;
+  --he | --h)
+    # Conflict between --help and --header
+    as_fn_error $? "ambiguous option: \`$1'
+Try \`$0 --help' for more information.";;
+  --help | --hel | -h )
+    $as_echo "$ac_cs_usage"; exit ;;
+  -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+  | -silent | --silent | --silen | --sile | --sil | --si | --s)
+    ac_cs_silent=: ;;
+
+  # This is an error.
+  -*) as_fn_error $? "unrecognized option: \`$1'
+Try \`$0 --help' for more information." ;;
+
+  *) as_fn_append ac_config_targets " $1"
+     ac_need_defaults=false ;;
+
+  esac
+  shift
+done
+
+ac_configure_extra_args=
+
+if $ac_cs_silent; then
+  exec 6>/dev/null
+  ac_configure_extra_args="$ac_configure_extra_args --silent"
+fi
+
+_ACEOF
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+if \$ac_cs_recheck; then
+  set X $SHELL '$0' $ac_configure_args \$ac_configure_extra_args --no-create --no-recursion
+  shift
+  \$as_echo "running CONFIG_SHELL=$SHELL \$*" >&6
+  CONFIG_SHELL='$SHELL'
+  export CONFIG_SHELL
+  exec "\$@"
+fi
+
+_ACEOF
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+exec 5>>config.log
+{
+  echo
+  sed 'h;s/./-/g;s/^.../## /;s/...$/ ##/;p;x;p;x' <<_ASBOX
+## Running $as_me. ##
+_ASBOX
+  $as_echo "$ac_log"
+} >&5
+
+_ACEOF
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+_ACEOF
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+
+# Handling of arguments.
+for ac_config_target in $ac_config_targets
+do
+  case $ac_config_target in
+    "Makefile") CONFIG_FILES="$CONFIG_FILES Makefile" ;;
+    "../tests/Makefile") CONFIG_FILES="$CONFIG_FILES ../tests/Makefile" ;;
+    "../include/nsock_config.h") CONFIG_HEADERS="$CONFIG_HEADERS ../include/nsock_config.h" ;;
+
+  *) as_fn_error $? "invalid argument: \`$ac_config_target'" "$LINENO" 5;;
+  esac
+done
+
+
+# If the user did not use the arguments to specify the items to instantiate,
+# then the envvar interface is used.  Set only those that are not.
+# We use the long form for the default assignment because of an extremely
+# bizarre bug on SunOS 4.1.3.
+if $ac_need_defaults; then
+  test "${CONFIG_FILES+set}" = set || CONFIG_FILES=$config_files
+  test "${CONFIG_HEADERS+set}" = set || CONFIG_HEADERS=$config_headers
+fi
+
+# Have a temporary directory for convenience.  Make it in the build tree
+# simply because there is no reason against having it here, and in addition,
+# creating and moving files from /tmp can sometimes cause problems.
+# Hook for its removal unless debugging.
+# Note that there is a small window in which the directory will not be cleaned:
+# after its creation but before its name has been assigned to `$tmp'.
+$debug ||
+{
+  tmp= ac_tmp=
+  trap 'exit_status=$?
+  : "${ac_tmp:=$tmp}"
+  { test ! -d "$ac_tmp" || rm -fr "$ac_tmp"; } && exit $exit_status
+' 0
+  trap 'as_fn_exit 1' 1 2 13 15
+}
+# Create a (secure) tmp directory for tmp files.
+
+{
+  tmp=`(umask 077 && mktemp -d "./confXXXXXX") 2>/dev/null` &&
+  test -d "$tmp"
+}  ||
+{
+  tmp=./conf$$-$RANDOM
+  (umask 077 && mkdir "$tmp")
+} || as_fn_error $? "cannot create a temporary directory in ." "$LINENO" 5
+ac_tmp=$tmp
+
+# Set up the scripts for CONFIG_FILES section.
+# No need to generate them if there are no CONFIG_FILES.
+# This happens for instance with `./config.status config.h'.
+if test -n "$CONFIG_FILES"; then
+
+
+ac_cr=`echo X | tr X '\015'`
+# On cygwin, bash can eat \r inside `` if the user requested igncr.
+# But we know of no other shell where ac_cr would be empty at this
+# point, so we can use a bashism as a fallback.
+if test "x$ac_cr" = x; then
+  eval ac_cr=\$\'\\r\'
+fi
+ac_cs_awk_cr=`$AWK 'BEGIN { print "a\rb" }' </dev/null 2>/dev/null`
+if test "$ac_cs_awk_cr" = "a${ac_cr}b"; then
+  ac_cs_awk_cr='\\r'
+else
+  ac_cs_awk_cr=$ac_cr
+fi
+
+echo 'BEGIN {' >"$ac_tmp/subs1.awk" &&
+_ACEOF
+
+
+{
+  echo "cat >conf$$subs.awk <<_ACEOF" &&
+  echo "$ac_subst_vars" | sed 's/.*/&!$&$ac_delim/' &&
+  echo "_ACEOF"
+} >conf$$subs.sh ||
+  as_fn_error $? "could not make $CONFIG_STATUS" "$LINENO" 5
+ac_delim_num=`echo "$ac_subst_vars" | grep -c '^'`
+ac_delim='%!_!# '
+for ac_last_try in false false false false false :; do
+  . ./conf$$subs.sh ||
+    as_fn_error $? "could not make $CONFIG_STATUS" "$LINENO" 5
+
+  ac_delim_n=`sed -n "s/.*$ac_delim\$/X/p" conf$$subs.awk | grep -c X`
+  if test $ac_delim_n = $ac_delim_num; then
+    break
+  elif $ac_last_try; then
+    as_fn_error $? "could not make $CONFIG_STATUS" "$LINENO" 5
+  else
+    ac_delim="$ac_delim!$ac_delim _$ac_delim!! "
+  fi
+done
+rm -f conf$$subs.sh
+
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+cat >>"\$ac_tmp/subs1.awk" <<\\_ACAWK &&
+_ACEOF
+sed -n '
+h
+s/^/S["/; s/!.*/"]=/
+p
+g
+s/^[^!]*!//
+:repl
+t repl
+s/'"$ac_delim"'$//
+t delim
+:nl
+h
+s/\(.\{148\}\)..*/\1/
+t more1
+s/["\\]/\\&/g; s/^/"/; s/$/\\n"\\/
+p
+n
+b repl
+:more1
+s/["\\]/\\&/g; s/^/"/; s/$/"\\/
+p
+g
+s/.\{148\}//
+t nl
+:delim
+h
+s/\(.\{148\}\)..*/\1/
+t more2
+s/["\\]/\\&/g; s/^/"/; s/$/"/
+p
+b
+:more2
+s/["\\]/\\&/g; s/^/"/; s/$/"\\/
+p
+g
+s/.\{148\}//
+t delim
+' <conf$$subs.awk | sed '
+/^[^""]/{
+  N
+  s/\n//
+}
+' >>$CONFIG_STATUS || ac_write_fail=1
+rm -f conf$$subs.awk
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+_ACAWK
+cat >>"\$ac_tmp/subs1.awk" <<_ACAWK &&
+  for (key in S) S_is_set[key] = 1
+  FS = ""
+
+}
+{
+  line = $ 0
+  nfields = split(line, field, "@")
+  substed = 0
+  len = length(field[1])
+  for (i = 2; i < nfields; i++) {
+    key = field[i]
+    keylen = length(key)
+    if (S_is_set[key]) {
+      value = S[key]
+      line = substr(line, 1, len) "" value "" substr(line, len + keylen + 3)
+      len += length(value) + length(field[++i])
+      substed = 1
+    } else
+      len += 1 + keylen
+  }
+
+  print line
+}
+
+_ACAWK
+_ACEOF
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+if sed "s/$ac_cr//" < /dev/null > /dev/null 2>&1; then
+  sed "s/$ac_cr\$//; s/$ac_cr/$ac_cs_awk_cr/g"
+else
+  cat
+fi < "$ac_tmp/subs1.awk" > "$ac_tmp/subs.awk" \
+  || as_fn_error $? "could not setup config files machinery" "$LINENO" 5
+_ACEOF
+
+# VPATH may cause trouble with some makes, so we remove sole $(srcdir),
+# ${srcdir} and @srcdir@ entries from VPATH if srcdir is ".", strip leading and
+# trailing colons and then remove the whole line if VPATH becomes empty
+# (actually we leave an empty line to preserve line numbers).
+if test "x$srcdir" = x.; then
+  ac_vpsub='/^[	 ]*VPATH[	 ]*=[	 ]*/{
+h
+s///
+s/^/:/
+s/[	 ]*$/:/
+s/:\$(srcdir):/:/g
+s/:\${srcdir}:/:/g
+s/:@srcdir@:/:/g
+s/^:*//
+s/:*$//
+x
+s/\(=[	 ]*\).*/\1/
+G
+s/\n//
+s/^[^=]*=[	 ]*$//
+}'
+fi
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+fi # test -n "$CONFIG_FILES"
+
+# Set up the scripts for CONFIG_HEADERS section.
+# No need to generate them if there are no CONFIG_HEADERS.
+# This happens for instance with `./config.status Makefile'.
+if test -n "$CONFIG_HEADERS"; then
+cat >"$ac_tmp/defines.awk" <<\_ACAWK ||
+BEGIN {
+_ACEOF
+
+# Transform confdefs.h into an awk script `defines.awk', embedded as
+# here-document in config.status, that substitutes the proper values into
+# config.h.in to produce config.h.
+
+# Create a delimiter string that does not exist in confdefs.h, to ease
+# handling of long lines.
+ac_delim='%!_!# '
+for ac_last_try in false false :; do
+  ac_tt=`sed -n "/$ac_delim/p" confdefs.h`
+  if test -z "$ac_tt"; then
+    break
+  elif $ac_last_try; then
+    as_fn_error $? "could not make $CONFIG_HEADERS" "$LINENO" 5
+  else
+    ac_delim="$ac_delim!$ac_delim _$ac_delim!! "
+  fi
+done
+
+# For the awk script, D is an array of macro values keyed by name,
+# likewise P contains macro parameters if any.  Preserve backslash
+# newline sequences.
+
+ac_word_re=[_$as_cr_Letters][_$as_cr_alnum]*
+sed -n '
+s/.\{148\}/&'"$ac_delim"'/g
+t rset
+:rset
+s/^[	 ]*#[	 ]*define[	 ][	 ]*/ /
+t def
+d
+:def
+s/\\$//
+t bsnl
+s/["\\]/\\&/g
+s/^ \('"$ac_word_re"'\)\(([^()]*)\)[	 ]*\(.*\)/P["\1"]="\2"\
+D["\1"]=" \3"/p
+s/^ \('"$ac_word_re"'\)[	 ]*\(.*\)/D["\1"]=" \2"/p
+d
+:bsnl
+s/["\\]/\\&/g
+s/^ \('"$ac_word_re"'\)\(([^()]*)\)[	 ]*\(.*\)/P["\1"]="\2"\
+D["\1"]=" \3\\\\\\n"\\/p
+t cont
+s/^ \('"$ac_word_re"'\)[	 ]*\(.*\)/D["\1"]=" \2\\\\\\n"\\/p
+t cont
+d
+:cont
+n
+s/.\{148\}/&'"$ac_delim"'/g
+t clear
+:clear
+s/\\$//
+t bsnlc
+s/["\\]/\\&/g; s/^/"/; s/$/"/p
+d
+:bsnlc
+s/["\\]/\\&/g; s/^/"/; s/$/\\\\\\n"\\/p
+b cont
+' <confdefs.h | sed '
+s/'"$ac_delim"'/"\\\
+"/g' >>$CONFIG_STATUS || ac_write_fail=1
+
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+  for (key in D) D_is_set[key] = 1
+  FS = ""
+}
+/^[\t ]*#[\t ]*(define|undef)[\t ]+$ac_word_re([\t (]|\$)/ {
+  line = \$ 0
+  split(line, arg, " ")
+  if (arg[1] == "#") {
+    defundef = arg[2]
+    mac1 = arg[3]
+  } else {
+    defundef = substr(arg[1], 2)
+    mac1 = arg[2]
+  }
+  split(mac1, mac2, "(") #)
+  macro = mac2[1]
+  prefix = substr(line, 1, index(line, defundef) - 1)
+  if (D_is_set[macro]) {
+    # Preserve the white space surrounding the "#".
+    print prefix "define", macro P[macro] D[macro]
+    next
+  } else {
+    # Replace #undef with comments.  This is necessary, for example,
+    # in the case of _POSIX_SOURCE, which is predefined and required
+    # on some systems where configure will not decide to define it.
+    if (defundef == "undef") {
+      print "/*", prefix defundef, macro, "*/"
+      next
+    }
+  }
+}
+{ print }
+_ACAWK
+_ACEOF
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+  as_fn_error $? "could not setup config headers machinery" "$LINENO" 5
+fi # test -n "$CONFIG_HEADERS"
+
+
+eval set X "  :F $CONFIG_FILES  :H $CONFIG_HEADERS    "
+shift
+for ac_tag
+do
+  case $ac_tag in
+  :[FHLC]) ac_mode=$ac_tag; continue;;
+  esac
+  case $ac_mode$ac_tag in
+  :[FHL]*:*);;
+  :L* | :C*:*) as_fn_error $? "invalid tag \`$ac_tag'" "$LINENO" 5;;
+  :[FH]-) ac_tag=-:-;;
+  :[FH]*) ac_tag=$ac_tag:$ac_tag.in;;
+  esac
+  ac_save_IFS=$IFS
+  IFS=:
+  set x $ac_tag
+  IFS=$ac_save_IFS
+  shift
+  ac_file=$1
+  shift
+
+  case $ac_mode in
+  :L) ac_source=$1;;
+  :[FH])
+    ac_file_inputs=
+    for ac_f
+    do
+      case $ac_f in
+      -) ac_f="$ac_tmp/stdin";;
+      *) # Look for the file first in the build tree, then in the source tree
+	 # (if the path is not absolute).  The absolute path cannot be DOS-style,
+	 # because $ac_f cannot contain `:'.
+	 test -f "$ac_f" ||
+	   case $ac_f in
+	   [\\/$]*) false;;
+	   *) test -f "$srcdir/$ac_f" && ac_f="$srcdir/$ac_f";;
+	   esac ||
+	   as_fn_error 1 "cannot find input file: \`$ac_f'" "$LINENO" 5;;
+      esac
+      case $ac_f in *\'*) ac_f=`$as_echo "$ac_f" | sed "s/'/'\\\\\\\\''/g"`;; esac
+      as_fn_append ac_file_inputs " '$ac_f'"
+    done
+
+    # Let's still pretend it is `configure' which instantiates (i.e., don't
+    # use $as_me), people would be surprised to read:
+    #    /* config.h.  Generated by config.status.  */
+    configure_input='Generated from '`
+	  $as_echo "$*" | sed 's|^[^:]*/||;s|:[^:]*/|, |g'
+	`' by configure.'
+    if test x"$ac_file" != x-; then
+      configure_input="$ac_file.  $configure_input"
+      { $as_echo "$as_me:${as_lineno-$LINENO}: creating $ac_file" >&5
+$as_echo "$as_me: creating $ac_file" >&6;}
+    fi
+    # Neutralize special characters interpreted by sed in replacement strings.
+    case $configure_input in #(
+    *\&* | *\|* | *\\* )
+       ac_sed_conf_input=`$as_echo "$configure_input" |
+       sed 's/[\\\\&|]/\\\\&/g'`;; #(
+    *) ac_sed_conf_input=$configure_input;;
+    esac
+
+    case $ac_tag in
+    *:-:* | *:-) cat >"$ac_tmp/stdin" \
+      || as_fn_error $? "could not create $ac_file" "$LINENO" 5 ;;
+    esac
+    ;;
+  esac
+
+  ac_dir=`$as_dirname -- "$ac_file" ||
+$as_expr X"$ac_file" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$ac_file" : 'X\(//\)[^/]' \| \
+	 X"$ac_file" : 'X\(//\)$' \| \
+	 X"$ac_file" : 'X\(/\)' \| . 2>/dev/null ||
+$as_echo X"$ac_file" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+  as_dir="$ac_dir"; as_fn_mkdir_p
+  ac_builddir=.
+
+case "$ac_dir" in
+.) ac_dir_suffix= ac_top_builddir_sub=. ac_top_build_prefix= ;;
+*)
+  ac_dir_suffix=/`$as_echo "$ac_dir" | sed 's|^\.[\\/]||'`
+  # A ".." for each directory in $ac_dir_suffix.
+  ac_top_builddir_sub=`$as_echo "$ac_dir_suffix" | sed 's|/[^\\/]*|/..|g;s|/||'`
+  case $ac_top_builddir_sub in
+  "") ac_top_builddir_sub=. ac_top_build_prefix= ;;
+  *)  ac_top_build_prefix=$ac_top_builddir_sub/ ;;
+  esac ;;
+esac
+ac_abs_top_builddir=$ac_pwd
+ac_abs_builddir=$ac_pwd$ac_dir_suffix
+# for backward compatibility:
+ac_top_builddir=$ac_top_build_prefix
+
+case $srcdir in
+  .)  # We are building in place.
+    ac_srcdir=.
+    ac_top_srcdir=$ac_top_builddir_sub
+    ac_abs_top_srcdir=$ac_pwd ;;
+  [\\/]* | ?:[\\/]* )  # Absolute name.
+    ac_srcdir=$srcdir$ac_dir_suffix;
+    ac_top_srcdir=$srcdir
+    ac_abs_top_srcdir=$srcdir ;;
+  *) # Relative name.
+    ac_srcdir=$ac_top_build_prefix$srcdir$ac_dir_suffix
+    ac_top_srcdir=$ac_top_build_prefix$srcdir
+    ac_abs_top_srcdir=$ac_pwd/$srcdir ;;
+esac
+ac_abs_srcdir=$ac_abs_top_srcdir$ac_dir_suffix
+
+
+  case $ac_mode in
+  :F)
+  #
+  # CONFIG_FILE
+  #
+
+_ACEOF
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+# If the template does not know about datarootdir, expand it.
+# FIXME: This hack should be removed a few years after 2.60.
+ac_datarootdir_hack=; ac_datarootdir_seen=
+ac_sed_dataroot='
+/datarootdir/ {
+  p
+  q
+}
+/@datadir@/p
+/@docdir@/p
+/@infodir@/p
+/@localedir@/p
+/@mandir@/p'
+case `eval "sed -n \"\$ac_sed_dataroot\" $ac_file_inputs"` in
+*datarootdir*) ac_datarootdir_seen=yes;;
+*@datadir@*|*@docdir@*|*@infodir@*|*@localedir@*|*@mandir@*)
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $ac_file_inputs seems to ignore the --datarootdir setting" >&5
+$as_echo "$as_me: WARNING: $ac_file_inputs seems to ignore the --datarootdir setting" >&2;}
+_ACEOF
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+  ac_datarootdir_hack='
+  s&@datadir@&$datadir&g
+  s&@docdir@&$docdir&g
+  s&@infodir@&$infodir&g
+  s&@localedir@&$localedir&g
+  s&@mandir@&$mandir&g
+  s&\\\${datarootdir}&$datarootdir&g' ;;
+esac
+_ACEOF
+
+# Neutralize VPATH when `$srcdir' = `.'.
+# Shell code in configure.ac might set extrasub.
+# FIXME: do we really want to maintain this feature?
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+ac_sed_extra="$ac_vpsub
+$extrasub
+_ACEOF
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+:t
+/@[a-zA-Z_][a-zA-Z_0-9]*@/!b
+s|@configure_input@|$ac_sed_conf_input|;t t
+s&@top_builddir@&$ac_top_builddir_sub&;t t
+s&@top_build_prefix@&$ac_top_build_prefix&;t t
+s&@srcdir@&$ac_srcdir&;t t
+s&@abs_srcdir@&$ac_abs_srcdir&;t t
+s&@top_srcdir@&$ac_top_srcdir&;t t
+s&@abs_top_srcdir@&$ac_abs_top_srcdir&;t t
+s&@builddir@&$ac_builddir&;t t
+s&@abs_builddir@&$ac_abs_builddir&;t t
+s&@abs_top_builddir@&$ac_abs_top_builddir&;t t
+$ac_datarootdir_hack
+"
+eval sed \"\$ac_sed_extra\" "$ac_file_inputs" | $AWK -f "$ac_tmp/subs.awk" \
+  >$ac_tmp/out || as_fn_error $? "could not create $ac_file" "$LINENO" 5
+
+test -z "$ac_datarootdir_hack$ac_datarootdir_seen" &&
+  { ac_out=`sed -n '/\${datarootdir}/p' "$ac_tmp/out"`; test -n "$ac_out"; } &&
+  { ac_out=`sed -n '/^[	 ]*datarootdir[	 ]*:*=/p' \
+      "$ac_tmp/out"`; test -z "$ac_out"; } &&
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $ac_file contains a reference to the variable \`datarootdir'
+which seems to be undefined.  Please make sure it is defined" >&5
+$as_echo "$as_me: WARNING: $ac_file contains a reference to the variable \`datarootdir'
+which seems to be undefined.  Please make sure it is defined" >&2;}
+
+  rm -f "$ac_tmp/stdin"
+  case $ac_file in
+  -) cat "$ac_tmp/out" && rm -f "$ac_tmp/out";;
+  *) rm -f "$ac_file" && mv "$ac_tmp/out" "$ac_file";;
+  esac \
+  || as_fn_error $? "could not create $ac_file" "$LINENO" 5
+ ;;
+  :H)
+  #
+  # CONFIG_HEADER
+  #
+  if test x"$ac_file" != x-; then
+    {
+      $as_echo "/* $configure_input  */" \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs"
+    } >"$ac_tmp/config.h" \
+      || as_fn_error $? "could not create $ac_file" "$LINENO" 5
+    if diff "$ac_file" "$ac_tmp/config.h" >/dev/null 2>&1; then
+      { $as_echo "$as_me:${as_lineno-$LINENO}: $ac_file is unchanged" >&5
+$as_echo "$as_me: $ac_file is unchanged" >&6;}
+    else
+      rm -f "$ac_file"
+      mv "$ac_tmp/config.h" "$ac_file" \
+	|| as_fn_error $? "could not create $ac_file" "$LINENO" 5
+    fi
+  else
+    $as_echo "/* $configure_input  */" \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs" \
+      || as_fn_error $? "could not create -" "$LINENO" 5
+  fi
+ ;;
+
+
+  esac
+
+done # for ac_tag
+
+
+as_fn_exit 0
+_ACEOF
+ac_clean_files=$ac_clean_files_save
+
+test $ac_write_fail = 0 ||
+  as_fn_error $? "write failure creating $CONFIG_STATUS" "$LINENO" 5
+
+
+# configure is writing to config.log, and then calls config.status.
+# config.status does its own redirection, appending to config.log.
+# Unfortunately, on DOS this fails, as config.log is still kept open
+# by configure, so config.status won't be able to write to it; its
+# output is simply discarded.  So we exec the FD to /dev/null,
+# effectively closing config.log, so it can be properly (re)opened and
+# appended to by config.status.  When coming back to configure, we
+# need to make the FD available again.
+if test "$no_create" != yes; then
+  ac_cs_success=:
+  ac_config_status_args=
+  test "$silent" = yes &&
+    ac_config_status_args="$ac_config_status_args --quiet"
+  exec 5>/dev/null
+  $SHELL $CONFIG_STATUS $ac_config_status_args || ac_cs_success=false
+  exec 5>>config.log
+  # Use ||, not &&, to avoid exiting from the if with $? = 1, which
+  # would make configure fail if this is the last instruction.
+  $ac_cs_success || as_fn_exit 1
+fi
+if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: unrecognized options: $ac_unrecognized_opts" >&5
+$as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
+fi
+
diff --git a/nsock/src/configure.ac b/nsock/src/configure.ac
new file mode 100644
index 0000000..1f035cf
--- /dev/null
+++ b/nsock/src/configure.ac
@@ -0,0 +1,317 @@
+# Require autoconf 2.13 -*- mode: fundamental; -*-
+
+# Because nsock is usually distributed with Nmap, the necessary files
+# config.guess, config.guess, and install-sh are not distributed with
+# nbase. Rather they are gotten from Nmap.
+
+AC_PREREQ(2.13)
+
+dnl Process this file with autoconf to produce a configure script.
+AC_INIT(nsock_core.c)
+
+dnl Find the Nmap source for nbase, etc.
+if test "${top_nmap_srcdir+set}" != set; then
+  top_nmap_srcdir=../..
+  export top_nmap_srcdir
+fi
+
+dnl Generate these files
+AC_CONFIG_FILES([Makefile ../tests/Makefile])
+
+dnl use nsock_config.h instad of -D macros
+AC_CONFIG_HEADER(../include/nsock_config.h)
+
+dnl Host specific hacks
+AC_CANONICAL_HOST
+
+AH_TEMPLATE(SOLARIS, [Sun/Oracle Solaris])
+AH_TEMPLATE(IRIX, [IRIX])
+
+case "$host" in
+  *alpha-dec-osf*)
+    AC_DEFINE(DEC, 1, [DEC Alpha])
+    ;;
+  *-netbsd* | *-knetbsd*-gnu)
+    AC_DEFINE(NETBSD, 1, [NetBSD])
+    ;;
+  *-openbsd*)
+    AC_DEFINE(OPENBSD, 1, [OpenBSD])
+    ;;
+  *-sgi-irix5*)
+    AC_DEFINE(IRIX)
+    ;;
+  *-sgi-irix6*)
+    AC_DEFINE(IRIX)
+    ;;
+  *-hpux*)
+    AC_DEFINE(HPUX, 1, [HP-UX])
+    ;;
+  *-solaris2.1[[1-9]]*)
+    AC_DEFINE(SOLARIS)
+    # Solaris 11 and later use BPF packet capture rather than DLPI.
+    AC_DEFINE(SOLARIS_BPF_PCAP_CAPTURE, 1, [BPF packet capture on Solaris])
+    ;;
+  *-solaris2.0*)
+    AC_DEFINE(SOLARIS)
+    ;;
+  *-solaris2.[[1-9]][[0-9]]*)
+    AC_DEFINE(SOLARIS)
+    ;;
+  *-solaris2.1*)
+    AC_DEFINE(SOLARIS)
+    ;;
+  *-solaris2.2*)
+    AC_DEFINE(SOLARIS)
+    ;;
+  *-solaris2.3*)
+    AC_DEFINE(SOLARIS)
+    ;;
+  *-solaris2.4*)
+    AC_DEFINE(SOLARIS)
+    ;;
+  *-solaris2.5.1)
+    AC_DEFINE(SOLARIS)
+    ;;
+  *-solaris*)
+    AC_DEFINE(SOLARIS)
+    ;;
+  *-sunos4*)
+    AC_DEFINE(SUNOS, 1, [SunOS 4])
+    ;;
+  *-linux*)
+    AC_DEFINE(LINUX, 1, [Linux])
+    ;;
+  *-freebsd* | *-kfreebsd*-gnu | *-dragonfly*)
+    AC_DEFINE(FREEBSD, 1, [FreeBSD])
+    ;;
+  *-bsdi*)
+    AC_DEFINE(BSDI, 1, [BSD/OS])
+    ;;
+  *-apple-darwin*)
+    AC_DEFINE(MACOSX, 1, [Apple OS X])
+    ;;
+esac
+
+
+AC_ARG_WITH(localdirs,
+  [  --with-localdirs        Explicitly ask compiler to use /usr/local/{include,libs} if they exist ],
+  [ case "$with_localdirs" in
+      yes)
+        user_localdirs=1
+        ;;
+      no)
+        user_localdirs=0
+        ;;
+    esac
+    ],
+  [ user_localdirs=0 ] )
+
+if test "$user_localdirs" = 1; then
+   if test -d /usr/local/lib; then
+     LDFLAGS="$LDFLAGS -L/usr/local/lib"
+     fi
+   if test -d /usr/local/include; then
+     CPPFLAGS="$CPPFLAGS -I/usr/local/include"
+   fi
+fi
+
+dnl Check whether libpcap is already available
+have_libpcap=no
+
+# By default, search for pcap library
+test "${with_libpcap+set}" != "set" && with_libpcap=yes
+
+AC_ARG_WITH(libpcap,
+AC_HELP_STRING([--with-libpcap=DIR], [Look for pcap headers in DIR/include.])
+AC_HELP_STRING([--with-libpcap=included], [Always use version included with Nmap])
+AC_HELP_STRING([--without-libpcap], [Disable pcap functions.]),
+[  case "$with_libpcap" in
+  yes)
+    AC_CHECK_HEADER(pcap.h,[
+      have_libpcap=yes
+      LIBPCAP_LIBS=-lpcap ])
+    ;;
+  included)
+    have_libpcap=no
+   ;;
+  no)
+    ;;
+  *)
+    _cppflags=$CPPFLAGS
+    _ldflags=$LDFLAGS
+
+    CPPFLAGS="-I$with_libpcap/include $CPPFLAGS"
+    LDFLAGS="-L$with_libpcap/lib $LDFLAGS"
+
+    AC_CHECK_HEADER(pcap.h,[
+      AC_CHECK_LIB(pcap, pcap_create,
+        [have_libpcap=yes
+        LIBPCAP_LIBS=-lpcap
+        LIBPCAP_INC=$with_libpcap/include
+        LIBPCAP_LIB=$with_libpcap/lib])])
+
+    LDFLAGS=$_ldflags
+    CPPFLAGS=$_cppflags
+    ;;
+  esac]
+)
+
+if test "$with_libpcap" != "no" -a "$have_libpcap" = "no"; then
+  LIBPCAP_INC=${top_nmap_srcdir}/libpcap
+  LIBPCAP_LIB=${top_nmap_srcdir}/libpcap
+  LIBPCAP_LIBS=${LIBPCAP_LIB}/libpcap.a
+  have_libpcap=yes
+  AC_DEFINE(HAVE_PCAP_SET_IMMEDIATE_MODE, 1, [Included libpcap has pcap_set_immediate_mode])
+else
+  # link with -lpcap for the purposes of this test
+  LIBS_OLD="$LIBS"
+  LIBS="$LIBS -lpcap"
+  AC_CHECK_FUNCS([pcap_set_immediate_mode])
+  # Restore libs
+  LIBS="$LIBS_OLD"
+fi
+
+if test "$have_libpcap" != "no"; then
+  AC_DEFINE(HAVE_PCAP, 1, [libpcap is available])
+  if test "${LIBPCAP_INC+set}" = "set"; then
+    CPPFLAGS="-I$LIBPCAP_INC $CPPFLAGS"
+    LDFLAGS="-L$LIBPCAP_LIB $LDFLAGS"
+  fi
+fi
+AC_SUBST(LIBPCAP_LIBS)
+
+AX_HAVE_EPOLL([AC_DEFINE(HAVE_EPOLL, 1, [epoll is available])], )
+AX_HAVE_POLL([AC_DEFINE(HAVE_POLL, 1, [poll is available])], )
+AC_CHECK_FUNCS(kqueue kevent, [AC_DEFINE(HAVE_KQUEUE)], )
+
+dnl Checks for programs.
+AC_PROG_CC
+ if test -n "$GCC"; then
+      CFLAGS="$CFLAGS -Wall "
+ fi
+AC_PROG_RANLIB
+dnl AC_PROG_INSTALL
+dnl AC_PATH_PROG(MAKEDEPEND, makedepend)
+
+dnl Checks for libraries.
+dnl AC_CHECK_LIB(m, pow)
+
+dnl If any socket libraries needed
+AC_CHECK_FUNC(gethostent, , AC_CHECK_LIB(nsl, gethostent))
+AC_CHECK_FUNC(setsockopt, , AC_CHECK_LIB(socket, setsockopt))
+
+dnl need posix4/nanosleep for solaris 2.4
+AC_CHECK_FUNC(nanosleep, , AC_CHECK_LIB(posix4, nanosleep))
+
+dnl Checks for header files.
+AC_HEADER_STDC
+AC_CHECK_HEADERS(net/bpf.h sys/ioctl.h sys/un.h netdb.h)
+AC_CHECK_HEADERS([linux/vm_sockets.h], , , [#include <sys/socket.h>])
+
+# We test whether they specified openssl desires explicitly
+use_openssl="yes"
+specialssldir=""
+AC_ARG_WITH(openssl,
+AC_HELP_STRING([--with-openssl=DIR],[Use optional openssl libs and includes from [DIR]/lib/ and [DIR]/include/openssl/)]),
+[  case "$with_openssl" in
+  yes)
+    ;;
+  no)
+    use_openssl="no"
+    ;;
+  *)
+    specialssldir="$with_openssl"
+    CPPFLAGS="$CPPFLAGS -I$with_openssl/include"
+    LDFLAGS="$LDFLAGS -L$with_openssl/lib"
+    ;;
+  esac]
+)
+
+# If they didn't specify it, we try to find it
+if test "$use_openssl" = "yes" -a -z "$specialssldir"; then
+  AC_CHECK_HEADER(openssl/ssl.h,,
+  [ use_openssl="no"
+    if test "$with_openssl" = "yes"; then
+      AC_MSG_ERROR([OpenSSL was explicitly requested but openssl/ssl.h was not found. Try the --with-openssl=DIR argument to give the location of OpenSSL or run configure with --without-openssl.])
+    fi
+    AC_MSG_WARN([Failed to find openssl/ssl.h so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument])
+  ])
+
+# use_openssl="yes" given explicitly in next 2 rules to avoid adding lib to $LIBS
+ if test "$use_openssl" = "yes"; then
+   AC_CHECK_LIB(crypto, BIO_int_ctrl,
+    [ use_openssl="yes"],
+    [ use_openssl="no"
+    if test "$with_openssl" = "yes"; then
+      AC_MSG_ERROR([OpenSSL was explicitly requested but libcrypto was not found. Try the --with-openssl=DIR argument to give the location of OpenSSL or run configure with --without-openssl.])
+    fi
+    AC_MSG_WARN([Failed to find libcrypto so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument])
+   ])
+ fi
+
+ if test "$use_openssl" = "yes"; then
+   AC_CHECK_LIB(ssl, SSL_new,
+    [ use_openssl="yes" ],
+    [ use_openssl="no"
+    if test "$with_openssl" = "yes"; then
+      AC_MSG_ERROR([OpenSSL was explicitly requested but libssl was not found. Try the --with-openssl=DIR argument to give the location of OpenSSL or run configure with --without-openssl.])
+    fi
+    AC_MSG_WARN([Failed to find libssl so OpenSSL will not be used. If it is installed you can try the --with-openssl=DIR argument]) ],
+    [ -lcrypto ])
+ fi
+fi
+
+# OpenSSL requires dlopen on some platforms
+AC_SEARCH_LIBS(dlopen, dl)
+
+OPENSSL_LIBS=
+if test "$use_openssl" = "yes"; then
+  AC_DEFINE(HAVE_OPENSSL, 1, [openssl is available])
+  OPENSSL_LIBS="-lssl -lcrypto"
+  LIBS_TMP="$LIBS"
+  LIBS="$OPENSSL_LIBS $LIBS"
+  AC_MSG_CHECKING([for SSL_set_tlsext_host_name])
+  AC_TRY_LINK([#include <openssl/ssl.h>], [SSL_set_tlsext_host_name(NULL, NULL)],
+    [AC_MSG_RESULT([yes]); AC_DEFINE(HAVE_SSL_SET_TLSEXT_HOST_NAME, 1, [SSL_set_tlsext_host_name available])],
+    [AC_MSG_RESULT([no])])
+  AC_MSG_CHECKING([for DTLS_client_method])
+  AC_TRY_LINK([#include <openssl/ssl.h>], [DTLS_client_method()],
+    [AC_MSG_RESULT([yes]); AC_DEFINE(HAVE_DTLS_CLIENT_METHOD, 1, [DTLS_client_method available])],
+    [AC_MSG_RESULT([no])])
+  AC_MSG_CHECKING([for SSL_set_alpn_protos])
+  AC_TRY_LINK([#include <openssl/ssl.h>], [SSL_set_alpn_protos(NULL, NULL, 0)],
+    [AC_MSG_RESULT([yes]); AC_DEFINE(HAVE_ALPN_SUPPORT, 1, [SSL ALPN protos support])],
+    [AC_MSG_RESULT([no])])
+  LIBS="$LIBS_TMP"
+
+fi
+
+AC_SUBST(OPENSSL_LIBS)
+
+dnl Checks for typedefs, structures, and compiler characteristics.
+
+AC_ARG_WITH(libnbase,
+[  --with-libnbase=DIR     Look for nbase include/libs in DIR],
+[  case "$with_libnbase" in
+  yes)
+    ;;
+  *)
+    NBASEDIR="$with_libnbase"
+    ;;
+  esac],
+NBASEDIR="${top_nmap_srcdir}/nbase"
+)
+
+NSOCKTESTDIR="../tests"
+
+LDFLAGS="$LDFLAGS -L$NBASEDIR"
+CPPFLAGS="$CPPFLAGS -I$NBASEDIR"
+LIBNBASE_LIBS="$LIBS -lnbase"
+
+AC_SUBST(LIBNBASE_LIBS)
+AC_SUBST(NBASEDIR)
+AC_SUBST(NSOCKTESTDIR)
+
+AC_SUBST(CFLAGS)
+
+AC_OUTPUT()
diff --git a/nsock/src/engine_epoll.c b/nsock/src/engine_epoll.c
new file mode 100644
index 0000000..1bc285c
--- /dev/null
+++ b/nsock/src/engine_epoll.c
@@ -0,0 +1,354 @@
+/***************************************************************************
+ * engine_epoll.c -- epoll(7) based IO engine.                             *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#endif
+
+#if HAVE_EPOLL
+
+#include <sys/epoll.h>
+#include <errno.h>
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+#if HAVE_PCAP
+#include "nsock_pcap.h"
+#endif
+
+#define INITIAL_EV_COUNT  128
+
+#define EPOLL_R_FLAGS (EPOLLIN | EPOLLPRI)
+#define EPOLL_W_FLAGS EPOLLOUT
+
+/* EPOLLRDHUP was introduced later and might be unavailable on older systems. */
+#ifndef EPOLLRDHUP
+  #define EPOLLRDHUP 0
+#endif
+#define EPOLL_X_FLAGS (EPOLLERR | EPOLLRDHUP| EPOLLHUP)
+
+
+/* --- ENGINE INTERFACE PROTOTYPES --- */
+static int epoll_init(struct npool *nsp);
+static void epoll_destroy(struct npool *nsp);
+static int epoll_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev);
+static int epoll_iod_unregister(struct npool *nsp, struct niod *iod);
+static int epoll_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr);
+static int epoll_loop(struct npool *nsp, int msec_timeout);
+
+extern struct io_operations posix_io_operations;
+
+/* ---- ENGINE DEFINITION ---- */
+struct io_engine engine_epoll = {
+  "epoll",
+  epoll_init,
+  epoll_destroy,
+  epoll_iod_register,
+  epoll_iod_unregister,
+  epoll_iod_modify,
+  epoll_loop,
+  &posix_io_operations
+};
+
+
+/* --- INTERNAL PROTOTYPES --- */
+static void iterate_through_event_lists(struct npool *nsp, int evcount);
+
+/* defined in nsock_core.c */
+void process_iod_events(struct npool *nsp, struct niod *nsi, int ev);
+void process_event(struct npool *nsp, gh_list_t *evlist, struct nevent *nse, int ev);
+void process_expired_events(struct npool *nsp);
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+int pcap_read_on_nonselect(struct npool *nsp);
+#endif
+#endif
+
+/* defined in nsock_event.c */
+void update_first_events(struct nevent *nse);
+
+
+extern struct timeval nsock_tod;
+
+
+/*
+ * Engine specific data structure
+ */
+struct epoll_engine_info {
+  /* file descriptor corresponding to our epoll instance */
+  int epfd;
+  /* number of epoll_events we can deal with */
+  int evlen;
+  /* list of epoll events, resized if necessary (when polling over large numbers of IODs) */
+  struct epoll_event *events;
+};
+
+
+int epoll_init(struct npool *nsp) {
+  struct epoll_engine_info *einfo;
+
+  einfo = (struct epoll_engine_info *)safe_malloc(sizeof(struct epoll_engine_info));
+
+  einfo->epfd = epoll_create(10); /* argument is ignored */
+  einfo->evlen = INITIAL_EV_COUNT;
+  einfo->events = (struct epoll_event *)safe_malloc(einfo->evlen * sizeof(struct epoll_event));
+
+  nsp->engine_data = (void *)einfo;
+
+  return 1;
+}
+
+void epoll_destroy(struct npool *nsp) {
+  struct epoll_engine_info *einfo = (struct epoll_engine_info *)nsp->engine_data;
+
+  assert(einfo != NULL);
+  close(einfo->epfd);
+  free(einfo->events);
+  free(einfo);
+}
+
+int epoll_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev) {
+  int sd;
+  struct epoll_event epev;
+  struct epoll_engine_info *einfo = (struct epoll_engine_info *)nsp->engine_data;
+
+  assert(!IOD_PROPGET(iod, IOD_REGISTERED));
+
+  iod->watched_events = ev;
+
+  memset(&epev, 0x00, sizeof(struct epoll_event));
+  epev.events = EPOLLET;
+  epev.data.ptr = (void *)iod;
+
+  if (ev & EV_READ)
+    epev.events |= EPOLL_R_FLAGS;
+  if (ev & EV_WRITE)
+    epev.events |= EPOLL_W_FLAGS;
+
+  sd = nsock_iod_get_sd(iod);
+  if (epoll_ctl(einfo->epfd, EPOLL_CTL_ADD, sd, &epev) < 0)
+    fatal("Unable to register IOD #%lu: %s", iod->id, strerror(errno));
+
+  IOD_PROPSET(iod, IOD_REGISTERED);
+  return 1;
+}
+
+int epoll_iod_unregister(struct npool *nsp, struct niod *iod) {
+  iod->watched_events = EV_NONE;
+
+  /* some IODs can be unregistered here if they're associated to an event that was
+   * immediately completed */
+  if (IOD_PROPGET(iod, IOD_REGISTERED)) {
+    struct epoll_engine_info *einfo = (struct epoll_engine_info *)nsp->engine_data;
+    int sd;
+
+    sd = nsock_iod_get_sd(iod);
+    epoll_ctl(einfo->epfd, EPOLL_CTL_DEL, sd, NULL);
+
+    IOD_PROPCLR(iod, IOD_REGISTERED);
+  }
+  return 1;
+}
+
+int epoll_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr) {
+  int sd;
+  struct epoll_event epev;
+  int new_events;
+  struct epoll_engine_info *einfo = (struct epoll_engine_info *)nsp->engine_data;
+
+  assert((ev_set & ev_clr) == 0);
+  assert(IOD_PROPGET(iod, IOD_REGISTERED));
+
+  memset(&epev, 0x00, sizeof(struct epoll_event));
+  epev.events = EPOLLET;
+  epev.data.ptr = (void *)iod;
+
+  new_events = iod->watched_events;
+  new_events |= ev_set;
+  new_events &= ~ev_clr;
+
+  if (new_events == iod->watched_events)
+    return 1; /* nothing to do */
+
+  iod->watched_events = new_events;
+
+  /* regenerate the current set of events for this IOD */
+  if (iod->watched_events & EV_READ)
+    epev.events |= EPOLL_R_FLAGS;
+  if (iod->watched_events & EV_WRITE)
+    epev.events |= EPOLL_W_FLAGS;
+
+  sd = nsock_iod_get_sd(iod);
+
+  if (epoll_ctl(einfo->epfd, EPOLL_CTL_MOD, sd, &epev) < 0)
+    fatal("Unable to update events for IOD #%lu: %s", iod->id, strerror(errno));
+
+  return 1;
+}
+
+int epoll_loop(struct npool *nsp, int msec_timeout) {
+  int results_left = 0;
+  int event_msecs; /* msecs before an event goes off */
+  int combined_msecs;
+  int sock_err = 0;
+  unsigned int iod_count;
+  struct epoll_engine_info *einfo = (struct epoll_engine_info *)nsp->engine_data;
+
+  assert(msec_timeout >= -1);
+
+  if (nsp->events_pending == 0)
+    return 0; /* No need to wait on 0 events ... */
+
+
+  iod_count = gh_list_count(&nsp->active_iods);
+  if (iod_count > einfo->evlen) {
+    einfo->evlen = iod_count * 2;
+    einfo->events = (struct epoll_event *)safe_realloc(einfo->events, einfo->evlen * sizeof(struct epoll_event));
+  }
+
+  do {
+    struct nevent *nse;
+
+    nsock_log_debug_all("wait for events");
+
+    nse = next_expirable_event(nsp);
+    if (!nse)
+      event_msecs = -1; /* None of the events specified a timeout */
+    else
+      event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+    /* Force a low timeout when capturing packets on systems where
+     * the pcap descriptor is not select()able. */
+    if (gh_list_count(&nsp->pcap_read_events) > 0)
+      if (event_msecs > PCAP_POLL_INTERVAL)
+        event_msecs = PCAP_POLL_INTERVAL;
+#endif
+#endif
+
+    /* We cast to unsigned because we want -1 to be very high (since it means no
+     * timeout) */
+    combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+    /* do non-blocking read on pcap devices that doesn't support select()
+     * If there is anything read, just leave this loop. */
+    if (pcap_read_on_nonselect(nsp)) {
+      /* okay, something was read. */
+    } else
+#endif
+#endif
+    {
+      results_left = epoll_wait(einfo->epfd, einfo->events, einfo->evlen, combined_msecs);
+      if (results_left == -1)
+        sock_err = socket_errno();
+    }
+
+    gettimeofday(&nsock_tod, NULL); /* Due to epoll delay */
+  } while (results_left == -1 && sock_err == EINTR); /* repeat only if signal occurred */
+
+  if (results_left == -1 && sock_err != EINTR) {
+    nsock_log_error("nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
+    nsp->errnum = sock_err;
+    return -1;
+  }
+
+  iterate_through_event_lists(nsp, results_left);
+
+  return 1;
+}
+
+
+/* ---- INTERNAL FUNCTIONS ---- */
+static inline int get_evmask(struct epoll_engine_info *einfo, int n) {
+  int evmask = EV_NONE;
+
+  if (einfo->events[n].events & EPOLL_R_FLAGS)
+    evmask |= EV_READ;
+  if (einfo->events[n].events & EPOLL_W_FLAGS)
+    evmask |= EV_WRITE;
+  if (einfo->events[n].events & EPOLL_X_FLAGS)
+    evmask |= EV_EXCEPT;
+
+  return evmask;
+}
+
+/* Iterate through all the event lists (such as connect_events, read_events,
+ * timer_events, etc) and take action for those that have completed (due to
+ * timeout, i/o, etc) */
+void iterate_through_event_lists(struct npool *nsp, int evcount) {
+  struct epoll_engine_info *einfo = (struct epoll_engine_info *)nsp->engine_data;
+  int n;
+
+  for (n = 0; n < evcount; n++) {
+    struct niod *nsi = (struct niod *)einfo->events[n].data.ptr;
+
+    assert(nsi);
+
+    /* process all the pending events for this IOD */
+    process_iod_events(nsp, nsi, get_evmask(einfo, n));
+
+    if (nsi->state == NSIOD_STATE_DELETED) {
+      gh_list_remove(&nsp->active_iods, &nsi->nodeq);
+      gh_list_prepend(&nsp->free_iods, &nsi->nodeq);
+    }
+  }
+
+  /* iterate through timers and expired events */
+  process_expired_events(nsp);
+}
+
+#endif /* HAVE_EPOLL */
+
diff --git a/nsock/src/engine_iocp.c b/nsock/src/engine_iocp.c
new file mode 100644
index 0000000..b1d4302
--- /dev/null
+++ b/nsock/src/engine_iocp.c
@@ -0,0 +1,788 @@
+/***************************************************************************
+ * engine_iocp.c -- I/O Completion Ports based IO engine.                  *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#if WIN32
+#include "nsock_winconfig.h"
+#endif
+
+#if HAVE_IOCP
+
+#include <Winsock2.h>
+#include <Mswsock.h>
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+#if HAVE_PCAP
+#include "nsock_pcap.h"
+#endif
+
+
+/* --- ENGINE INTERFACE PROTOTYPES --- */
+static int iocp_init(struct npool *nsp);
+static void iocp_destroy(struct npool *nsp);
+static int iocp_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev);
+static int iocp_iod_unregister(struct npool *nsp, struct niod *iod);
+static int iocp_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr);
+static int iocp_loop(struct npool *nsp, int msec_timeout);
+
+int iocp_iod_connect(struct npool *nsp, int sockfd, const struct sockaddr *addr, socklen_t addrlen);
+int iocp_iod_read(struct npool *nsp, int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen);
+int iocp_iod_write(struct npool *nsp, int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen);
+
+struct io_operations iocp_io_operations = {
+  iocp_iod_connect,
+  iocp_iod_read,
+  iocp_iod_write
+};
+
+/* ---- ENGINE DEFINITION ---- */
+struct io_engine engine_iocp = {
+  "iocp",
+  iocp_init,
+  iocp_destroy,
+  iocp_iod_register,
+  iocp_iod_unregister,
+  iocp_iod_modify,
+  iocp_loop,
+  &iocp_io_operations
+};
+
+/*
+* Engine specific data structure
+*/
+struct iocp_engine_info {
+  /* The handle to the Completion Port*/
+  HANDLE iocp;
+
+  /* We put the current eov to be processed here in order to be retrieved by nsock_core */
+  struct extended_overlapped *eov;
+
+  /* The overlapped_entry list used to retrieve completed packets from the port */
+  OVERLAPPED_ENTRY *eov_list;
+  unsigned long capacity;
+
+  /* How many Completion Packets we actually retreieved */
+  unsigned long entries_removed;
+
+  gh_list_t active_eovs;
+  gh_list_t free_eovs;
+};
+
+struct extended_overlapped {
+  /* Overlapped structure used for overlapped operations */
+  OVERLAPPED ov;
+
+  /* Did we get an error when we initiated the operation?
+  Put the error code here and post it to the main loop */
+  int err;
+
+  /* The event may have expired and was recycled, we can't trust
+  a pointer to the nevent structure to tell us the real nevent */
+  nsock_event_id nse_id;
+
+  /* A pointer to the event */
+  struct nevent *nse;
+
+  /* Needed for WSARecv/WSASend */
+  WSABUF wsabuf;
+
+  /* This is the buffer we will read data in */
+  char *readbuf;
+
+  /* The struct npool keeps track of EOVs that have been allocated so that it
+  * can destroy them if the msp is deleted.  This pointer makes it easy to
+  * remove this struct extended_overlapped from the allocated list when necessary */
+  gh_lnode_t nodeq;
+};
+
+/* --- INTERNAL PROTOTYPES --- */
+static void iterate_through_event_lists(struct npool *nsp);
+static void iterate_through_pcap_events(struct npool *nsp);
+static void terminate_overlapped_event(struct npool *nsp, struct nevent *nse);
+static void initiate_overlapped_event(struct npool *nsp, struct nevent *nse);
+static int get_overlapped_result(struct npool *nsp, int fd, const void *buffer, size_t count);
+static void force_operation(struct npool *nsp, struct nevent *nse);
+static void free_eov(struct npool *nsp, struct extended_overlapped *eov);
+static int map_faulty_errors(int err);
+
+/* defined in nsock_core.c */
+void process_iod_events(struct npool *nsp, struct niod *nsi, int ev);
+void process_event(struct npool *nsp, gh_list_t *evlist, struct nevent *nse, int ev);
+void process_expired_events(struct npool *nsp);
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+int pcap_read_on_nonselect(struct npool *nsp);
+#endif
+#endif
+
+/* defined in nsock_event.c */
+void update_first_events(struct nevent *nse);
+
+
+extern struct timeval nsock_tod;
+
+int iocp_init(struct npool *nsp) {
+  struct iocp_engine_info *iinfo;
+
+  iinfo = (struct iocp_engine_info *)safe_malloc(sizeof(struct iocp_engine_info));
+
+  gh_list_init(&iinfo->active_eovs);
+  gh_list_init(&iinfo->free_eovs);
+
+  iinfo->iocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, NULL, 0);
+  iinfo->capacity = 10;
+  iinfo->eov = NULL;
+  iinfo->entries_removed = 0;
+  iinfo->eov_list = (OVERLAPPED_ENTRY *)safe_malloc(iinfo->capacity * sizeof(OVERLAPPED_ENTRY));
+  nsp->engine_data = (void *)iinfo;
+
+  return 1;
+}
+
+void iocp_destroy(struct npool *nsp) {
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+
+  assert(iinfo != NULL);
+
+  struct extended_overlapped *eov;
+  gh_lnode_t *current;
+
+  while ((current = gh_list_pop(&iinfo->active_eovs))) {
+    eov = container_of(current, struct extended_overlapped, nodeq);
+    if (eov->readbuf) {
+      free(eov->readbuf);
+      eov->readbuf = NULL;
+    }
+    free(eov);
+  }
+
+  while ((current = gh_list_pop(&iinfo->free_eovs))) {
+    eov = container_of(current, struct extended_overlapped, nodeq);
+    free(eov);
+  }
+
+  gh_list_free(&iinfo->active_eovs);
+  gh_list_free(&iinfo->free_eovs);
+
+  CloseHandle(iinfo->iocp);
+  free(iinfo->eov_list);
+
+  free(iinfo);
+}
+
+int iocp_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev) {
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+  HANDLE result;
+
+  assert(!IOD_PROPGET(iod, IOD_REGISTERED));
+  iod->watched_events = ev;
+  result = CreateIoCompletionPort((HANDLE)iod->sd, iinfo->iocp, NULL, 0);
+  assert(result);
+
+  IOD_PROPSET(iod, IOD_REGISTERED);
+
+  initiate_overlapped_event(nsp, nse);
+
+  return 1;
+}
+
+/* Sadly a socket can't be unassociated with a completion port */
+int iocp_iod_unregister(struct npool *nsp, struct niod *iod) {
+
+  if (IOD_PROPGET(iod, IOD_REGISTERED)) {
+    /* Nuke all uncompleted operations on that iod */
+    CancelIo((HANDLE)iod->sd);
+    IOD_PROPCLR(iod, IOD_REGISTERED);
+  }
+
+  return 1;
+}
+
+int iocp_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr) {
+  int new_events;
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+
+  assert((ev_set & ev_clr) == 0);
+  assert(IOD_PROPGET(iod, IOD_REGISTERED));
+
+  new_events = iod->watched_events;
+  new_events |= ev_set;
+  new_events &= ~ev_clr;
+
+  if (ev_set != EV_NONE)
+    initiate_overlapped_event(nsp, nse);
+  else if (ev_clr != EV_NONE)
+    terminate_overlapped_event(nsp, nse);
+
+  if (new_events == iod->watched_events)
+    return 1; /* nothing to do */
+
+  iod->watched_events = new_events;
+
+  return 1;
+}
+
+int iocp_loop(struct npool *nsp, int msec_timeout) {
+  int event_msecs; /* msecs before an event goes off */
+  int combined_msecs;
+  int sock_err = 0;
+  BOOL bRet;
+  unsigned long total_events;
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+
+  assert(msec_timeout >= -1);
+
+  if (nsp->events_pending == 0)
+    return 0; /* No need to wait on 0 events ... */
+
+
+  struct nevent *nse;
+
+  /* Make sure the preallocated space for the retrieved events is big enough */
+  total_events = gh_list_count(&nsp->connect_events) + gh_list_count(&nsp->read_events) + gh_list_count(&nsp->write_events);
+  if (iinfo->capacity < total_events) {
+    iinfo->capacity *= 2;
+    iinfo->eov_list = (OVERLAPPED_ENTRY *)safe_realloc(iinfo->eov_list, iinfo->capacity * sizeof(OVERLAPPED_ENTRY));
+  }
+
+  nsock_log_debug_all("wait for events");
+
+  nse = next_expirable_event(nsp);
+  if (!nse)
+    event_msecs = -1; /* None of the events specified a timeout */
+  else
+    event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+  /* Force a low timeout when capturing packets on systems where
+  * the pcap descriptor is not select()able. */
+  if (gh_list_count(&nsp->pcap_read_events) > 0)
+  if (event_msecs > PCAP_POLL_INTERVAL)
+    event_msecs = PCAP_POLL_INTERVAL;
+#endif
+#endif
+
+  /* We cast to unsigned because we want -1 to be very high (since it means no
+  * timeout) */
+  combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+  /* do non-blocking read on pcap devices that doesn't support select()
+  * If there is anything read, just leave this loop. */
+  if (pcap_read_on_nonselect(nsp)) {
+    /* okay, something was read. */
+    gettimeofday(&nsock_tod, NULL);
+    iterate_through_pcap_events(nsp);
+  }
+  else
+#endif
+#endif
+  {
+    /* It is mandatory these values are reset before calling GetQueuedCompletionStatusEx */
+    iinfo->entries_removed = 0;
+    memset(iinfo->eov_list, 0, iinfo->capacity * sizeof(OVERLAPPED_ENTRY));
+    bRet = GetQueuedCompletionStatusEx(iinfo->iocp, iinfo->eov_list, iinfo->capacity, &iinfo->entries_removed, combined_msecs, FALSE);
+
+    gettimeofday(&nsock_tod, NULL); /* Due to iocp delay */
+    if (!bRet) {
+      sock_err = socket_errno();
+      if (!iinfo->eov && sock_err != WAIT_TIMEOUT) {
+        nsock_log_error("nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
+        nsp->errnum = sock_err;
+        return -1;
+      }
+    }
+  }
+
+  iterate_through_event_lists(nsp);
+
+  return 1;
+}
+
+
+/* ---- INTERNAL FUNCTIONS ---- */
+
+#if HAVE_PCAP
+/* Iterate through pcap events separately, since these are not tracked in iocp_engine_info */
+void iterate_through_pcap_events(struct npool *nsp) {
+  gh_lnode_t *current, *next, *last;
+
+  last = gh_list_last_elem(&nsp->active_iods);
+
+  for (current = gh_list_first_elem(&nsp->active_iods);
+       current != NULL && gh_lnode_prev(current) != last;
+       current = next) {
+    struct niod *nsi = container_of(current, struct niod, nodeq);
+
+    if (nsi->pcap && nsi->state != NSIOD_STATE_DELETED && nsi->events_pending)
+    {
+      process_iod_events(nsp, nsi, EV_READ);
+    }
+
+    next = gh_lnode_next(current);
+    if (nsi->state == NSIOD_STATE_DELETED) {
+      gh_list_remove(&nsp->active_iods, current);
+      gh_list_prepend(&nsp->free_iods, current);
+    }
+  }
+}
+#endif
+
+/* Iterate through all the event lists (such as connect_events, read_events,
+* timer_events, etc) and take action for those that have completed (due to
+* timeout, i/o, etc) */
+void iterate_through_event_lists(struct npool *nsp) {
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+
+  for (unsigned long i = 0; i < iinfo->entries_removed; i++) {
+
+    iinfo->eov = (struct extended_overlapped *)iinfo->eov_list[i].lpOverlapped;
+    /* We can't rely on iinfo->entries_removed to tell us the real number of
+     * events to process */
+    if (!iinfo->eov || !iinfo->eov->nse)
+      continue;
+
+    /* We check if this is from a cancelled operation */
+    if (iinfo->eov->nse->id != iinfo->eov->nse_id ||
+        iinfo->eov->nse->event_done) {
+      free_eov(nsp, iinfo->eov);
+      iinfo->eov = NULL;
+      continue;
+    }
+
+    if (!HasOverlappedIoCompleted((OVERLAPPED *)iinfo->eov))
+      continue;
+
+    struct niod *nsi = iinfo->eov->nse->iod;
+    struct nevent *nse = iinfo->eov->nse;
+    gh_list_t *evlist = NULL;
+    int ev = 0;
+
+    switch (nse->type) {
+      case NSE_TYPE_CONNECT:
+      case NSE_TYPE_CONNECT_SSL:
+        ev = EV_READ;
+        evlist = &nsp->connect_events;
+        break;
+      case NSE_TYPE_READ:
+        ev = EV_READ;
+        evlist = &nsp->read_events;
+        break;
+      case NSE_TYPE_WRITE:
+        ev = EV_WRITE;
+        evlist = &nsp->write_events;
+        break;
+    }
+
+    /* Setting the connect error for nsock_core to get in handle_connect_result */
+    if (nse->type == NSE_TYPE_CONNECT || nse->type == NSE_TYPE_CONNECT_SSL) {
+      setsockopt(nse->iod->sd, SOL_SOCKET, SO_UPDATE_CONNECT_CONTEXT, NULL, 0);
+      DWORD dwRes;
+      if (!GetOverlappedResult((HANDLE)nse->iod->sd, (LPOVERLAPPED)iinfo->eov, &dwRes, FALSE)) {

+        int err = map_faulty_errors(socket_errno());
+        if (err)
+          setsockopt(nse->iod->sd, SOL_SOCKET, SO_ERROR, (char *)&err, sizeof(err));
+      }
+    }
+
+    process_event(nsp, evlist, nse, ev);
+
+    if (nse->event_done) {
+      /* event is done, remove it from the event list and update IOD pointers
+      * to the first events of each kind */
+      update_first_events(nse);
+      gh_list_remove(evlist, &nse->nodeq_io);
+      gh_list_append(&nsp->free_events, &nse->nodeq_io);
+
+      if (nse->timeout.tv_sec)
+        gh_heap_remove(&nsp->expirables, &nse->expire);
+    } else
+      initiate_overlapped_event(nsp, nse);
+
+    if (nsi->state == NSIOD_STATE_DELETED) {
+      gh_list_remove(&nsp->active_iods, &nsi->nodeq);
+      gh_list_prepend(&nsp->free_iods, &nsi->nodeq);
+    }
+
+    iinfo->eov = NULL;
+  }
+
+  /* iterate through timers and expired events */
+  process_expired_events(nsp);
+}
+
+static int errcode_is_failure(int err) {
+#ifndef WIN32
+  return err != EINTR && err != EAGAIN && err != EBUSY;
+#else
+  return err != EINTR && err != EAGAIN && err != WSA_IO_PENDING && err != ERROR_NETNAME_DELETED;
+#endif
+}
+
+static int map_faulty_errors(int err) {
+  /* This actually happens https://svn.boost.org/trac/boost/ticket/10744 */
+  switch (err) {
+    case ERROR_NETWORK_UNREACHABLE: return WSAENETUNREACH;
+    case ERROR_HOST_UNREACHABLE: return WSAEHOSTUNREACH;
+    case ERROR_CONNECTION_REFUSED: return WSAECONNREFUSED;
+    case ERROR_SEM_TIMEOUT: return WSAETIMEDOUT;
+  }
+  return err;
+}
+
+static struct extended_overlapped *new_eov(struct npool *nsp, struct nevent *nse) {
+  struct extended_overlapped *eov;
+  gh_lnode_t *lnode;
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+
+  lnode = gh_list_pop(&iinfo->free_eovs);

+  if (!lnode)
+    eov = (struct extended_overlapped *)safe_malloc(sizeof(struct extended_overlapped));
+  else
+    eov = container_of(lnode, struct extended_overlapped, nodeq);
+
+  memset(eov, 0, sizeof(struct extended_overlapped));
+  nse->eov = eov;
+  eov->nse = nse;
+  eov->nse_id = nse->id;
+  eov->err = 0;
+  gh_list_prepend(&iinfo->active_eovs, &eov->nodeq);
+
+  /* Make the read buffer equal to the size of the buffer in do_actual_read() */
+  if (nse->type == NSE_TYPE_READ && !eov->readbuf && !nse->iod->ssl)
+    eov->readbuf = (char*)safe_malloc(READ_BUFFER_SZ * sizeof(char));
+
+  return eov;
+}
+
+/* This needs to be called after getting the overlapped event in */
+static void free_eov(struct npool *nsp, struct extended_overlapped *eov) {
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+  struct nevent *nse = eov->nse;
+
+  gh_list_remove(&iinfo->active_eovs, &eov->nodeq);
+
+  if (eov->readbuf) {
+    free(eov->readbuf);
+    eov->readbuf = NULL;
+  }
+
+  gh_list_prepend(&iinfo->free_eovs, &eov->nodeq);
+
+  eov->nse = NULL;
+  if (nse)
+    nse->eov = NULL;
+}
+
+
+static void call_connect_overlapped(struct npool *nsp, struct nevent *nse) {
+  BOOL ok;
+  DWORD numBytes = 0;
+  int one = 1;
+  SOCKET sock = nse->iod->sd;
+  GUID guid = WSAID_CONNECTEX;
+  struct sockaddr_in addr;
+  LPFN_CONNECTEX ConnectExPtr = NULL;
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nse->iod->nsp->engine_data;
+  struct extended_overlapped *eov = new_eov(nsp, nse);
+  int ret;
+  struct sockaddr_storage *ss = &nse->iod->peer;
+  size_t sslen = nse->iod->peerlen;
+
+  if (nse->iod->lastproto != IPPROTO_TCP) {
+    if (connect(sock, (struct sockaddr *)ss, sslen) == -1) {
+      int err = socket_errno();
+      nse->event_done = 1;
+      nse->status = NSE_STATUS_ERROR;
+      nse->errnum = err;
+    } else {
+      force_operation(nsp, nse);
+    }
+    return;
+  }
+
+  ret = WSAIoctl(sock, SIO_GET_EXTENSION_FUNCTION_POINTER,
+    (void*)&guid, sizeof(guid), (void*)&ConnectExPtr, sizeof(ConnectExPtr),
+    &numBytes, NULL, NULL);
+  if (ret)
+    fatal("Error initiating event type(%d)", nse->type);
+
+  ret = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&one, sizeof(one));

+  if (ret == -1) {

+    int err = socket_errno();
+    nse->event_done = 1;
+    nse->status = NSE_STATUS_ERROR;
+    nse->errnum = err;
+    return;
+  }
+
+  /* ConnectEx doesn't automatically bind the socket */
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_addr.s_addr = INADDR_ANY;
+  addr.sin_port = 0;
+  if (!nse->iod->locallen) {
+    ret = bind(sock, (SOCKADDR*)&addr, sizeof(addr));
+    if (ret) {
+      int err = socket_errno();
+      nse->event_done = 1;
+      nse->status = NSE_STATUS_ERROR;
+      nse->errnum = err;
+      return;
+    }
+  }
+
+  ok = ConnectExPtr(sock, (SOCKADDR*)ss, sslen, NULL, 0, NULL, (LPOVERLAPPED)eov);
+  if (!ok) {
+    int err = socket_errno();
+    if (err != ERROR_IO_PENDING) {
+      nse->event_done = 1;
+      nse->status = NSE_STATUS_ERROR;
+      nse->errnum = err;
+    }
+  }
+}
+
+static void call_read_overlapped(struct nevent *nse) {
+  DWORD flags = 0;
+  int err = 0;
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nse->iod->nsp->engine_data;
+
+  struct extended_overlapped *eov = new_eov(nse->iod->nsp, nse);
+
+  eov->wsabuf.buf = eov->readbuf;
+  eov->wsabuf.len = READ_BUFFER_SZ;
+
+  err = WSARecvFrom(nse->iod->sd, &eov->wsabuf, 1, NULL, &flags,
+    (struct sockaddr *)&nse->iod->peer, (LPINT)&nse->iod->peerlen, (LPOVERLAPPED)eov, NULL);
+  if (err) {
+    err = socket_errno();
+    if (errcode_is_failure(err)) {
+      // WSARecvFrom with overlapped I/O may generate ERROR_PORT_UNREACHABLE on ICMP error.
+      // We'll translate that so Nsock-using software doesn't have to know about it.
+      eov->err = (err == ERROR_PORT_UNREACHABLE ? ECONNREFUSED : err);
+      /* Send the error to the main loop to be picked up by the appropriate handler */
+      BOOL bRet = PostQueuedCompletionStatus(iinfo->iocp, -1, (ULONG_PTR)nse->iod, (LPOVERLAPPED)eov);
+      if (!bRet)
+        fatal("Error initiating event type(%d)", nse->type);
+    }
+  }
+}
+
+static void call_write_overlapped(struct nevent *nse) {
+  int err;
+  char *str;
+  int bytesleft;
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nse->iod->nsp->engine_data;
+
+  struct extended_overlapped *eov = new_eov(nse->iod->nsp, nse);
+
+  str = fs_str(&nse->iobuf) + nse->writeinfo.written_so_far;
+  bytesleft = fs_length(&nse->iobuf) - nse->writeinfo.written_so_far;
+
+  eov->wsabuf.buf = str;
+  eov->wsabuf.len = bytesleft;
+
+  if (nse->writeinfo.dest.ss_family == AF_UNSPEC)
+    err = WSASend(nse->iod->sd, &eov->wsabuf, 1, NULL, 0, (LPWSAOVERLAPPED)eov, NULL);
+  else
+    err = WSASendTo(nse->iod->sd, &eov->wsabuf, 1, NULL, 0,
+    (struct sockaddr *)&nse->writeinfo.dest, (int)nse->writeinfo.destlen,
+    (LPWSAOVERLAPPED)eov, NULL);
+  if (err) {
+    err = socket_errno();
+    if (errcode_is_failure(err)) {
+      eov->err = err;
+      /* Send the error to the main loop to be picked up by the appropriate handler */
+      BOOL bRet = PostQueuedCompletionStatus(iinfo->iocp, -1, (ULONG_PTR)nse->iod, (LPOVERLAPPED)eov);
+      if (!bRet)
+        fatal("Error initiating event type(%d)", nse->type);
+    }
+  }
+}
+
+/* Anything that isn't an overlapped operation uses this to get processed by the main loop */
+static void force_operation(struct npool *nsp, struct nevent *nse) {
+  BOOL bRet;
+  struct extended_overlapped *eov;
+
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+  eov = new_eov(nse->iod->nsp, nse);
+
+  bRet = PostQueuedCompletionStatus(iinfo->iocp, 0, (ULONG_PTR)nse->iod, (LPOVERLAPPED)eov);
+  if (!bRet)
+    fatal("Error initiating event type(%d)", nse->type);
+}
+
+/* Either initiate a I/O read or force a SSL_read */
+static void initiate_read(struct npool *nsp, struct nevent *nse) {
+  if (!nse->iod->ssl)
+    call_read_overlapped(nse);
+  else
+    force_operation(nsp, nse);
+}
+
+/* Either initiate a I/O write or force a SSL_write */
+static void initiate_write(struct npool *nsp, struct nevent *nse) {
+  if (!nse->iod->ssl)
+    call_write_overlapped(nse);
+  else
+    force_operation(nsp, nse);
+}
+
+/* Force a PCAP read */
+static void initiate_pcap_read(struct npool *nsp, struct nevent *nse) {
+  force_operation(nsp, nse);
+}
+
+static void initiate_connect(struct npool *nsp, struct nevent *nse) {
+  int sslconnect_inprogress = 0;
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+
+#if HAVE_OPENSSL
+  sslconnect_inprogress = nse->type == NSE_TYPE_CONNECT_SSL && nse->iod &&
+    (nse->sslinfo.ssl_desire == SSL_ERROR_WANT_READ ||
+    nse->sslinfo.ssl_desire == SSL_ERROR_WANT_WRITE);
+#endif
+
+  if (sslconnect_inprogress)
+    force_operation(nsp, nse);
+  else
+    call_connect_overlapped(nsp, nse);
+}
+
+/* Start the overlapped I/O operation */
+static void initiate_overlapped_event(struct npool *nsp, struct nevent *nse) {
+  if (nse->eov)
+    terminate_overlapped_event(nsp, nse);
+
+  switch (nse->type) {
+  case NSE_TYPE_CONNECT:
+  case NSE_TYPE_CONNECT_SSL:
+    initiate_connect(nsp, nse);
+    break;
+  case NSE_TYPE_READ:
+    initiate_read(nsp, nse);
+    break;
+  case NSE_TYPE_WRITE:
+    initiate_write(nsp, nse);
+    break;
+#if HAVE_PCAP
+  case NSE_TYPE_PCAP_READ:
+    initiate_pcap_read(nsp, nse);
+    break;
+#endif
+  default: fatal("Event type(%d) not supported by engine IOCP\n", nse->type);
+  }
+}
+
+/* Terminate an overlapped I/O operation that expired */
+static void terminate_overlapped_event(struct npool *nsp, struct nevent *nse) {
+  bool eov_done = true;
+
+  if (nse->eov) {
+    if (!HasOverlappedIoCompleted((LPOVERLAPPED)nse->eov)) {
+      CancelIoEx((HANDLE)nse->iod->sd, (LPOVERLAPPED)nse->eov);
+      eov_done = false;
+    }
+
+    if (eov_done)
+      free_eov(nsp, nse->eov);
+  }
+}
+
+/* Retrieve the amount of bytes transferred or set the appropriate error */
+static int get_overlapped_result(struct npool *nsp, int fd, const void *buffer, size_t count) {
+  char *buf = (char *)buffer;
+  DWORD dwRes = 0;
+  int err;
+  struct iocp_engine_info *iinfo = (struct iocp_engine_info *)nsp->engine_data;
+
+  struct extended_overlapped *eov = iinfo->eov;
+  struct nevent *nse = eov->nse;
+
+  /* If the operation failed at initialization, set the error for nsock_core.c to see */
+  if (eov->err) {
+    SetLastError(map_faulty_errors(eov->err));
+    return -1;
+  }
+
+  if (!GetOverlappedResult((HANDLE)fd, (LPOVERLAPPED)eov, &dwRes, FALSE)) {
+    err = socket_errno();
+    if (errcode_is_failure(err)) {
+      SetLastError(map_faulty_errors(err));
+      return -1;
+    }
+  }
+
+  if (nse->type == NSE_TYPE_READ && buf)
+    memcpy(buf, eov->wsabuf.buf, dwRes);
+
+  return dwRes;
+}
+
+int iocp_iod_connect(struct npool *nsp, int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
+  return 0;
+}
+
+int iocp_iod_read(struct npool *nsp, int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen) {
+  return get_overlapped_result(nsp, sockfd, buf, len);
+}
+
+int iocp_iod_write(struct npool *nsp, int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen) {
+  return get_overlapped_result(nsp, sockfd, buf, len);
+}
+
+#endif /* HAVE_IOCP */
diff --git a/nsock/src/engine_kqueue.c b/nsock/src/engine_kqueue.c
new file mode 100644
index 0000000..aa992bb
--- /dev/null
+++ b/nsock/src/engine_kqueue.c
@@ -0,0 +1,368 @@
+/***************************************************************************
+ * engine_kqueue.c -- BSD kqueue(2) based IO engine.                       *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#endif
+
+#if HAVE_KQUEUE
+
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/time.h>
+#include <errno.h>
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+#if HAVE_PCAP
+#include "nsock_pcap.h"
+#endif
+
+#define INITIAL_EV_COUNT  128
+
+
+/* --- ENGINE INTERFACE PROTOTYPES --- */
+static int kqueue_init(struct npool *nsp);
+static void kqueue_destroy(struct npool *nsp);
+static int kqueue_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev);
+static int kqueue_iod_unregister(struct npool *nsp, struct niod *iod);
+static int kqueue_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr);
+static int kqueue_loop(struct npool *nsp, int msec_timeout);
+
+extern struct io_operations posix_io_operations;
+
+/* ---- ENGINE DEFINITION ---- */
+struct io_engine engine_kqueue = {
+  "kqueue",
+  kqueue_init,
+  kqueue_destroy,
+  kqueue_iod_register,
+  kqueue_iod_unregister,
+  kqueue_iod_modify,
+  kqueue_loop,
+  &posix_io_operations
+};
+
+
+/* --- INTERNAL PROTOTYPES --- */
+static void iterate_through_event_lists(struct npool *nsp, int evcount);
+
+/* defined in nsock_core.c */
+void process_iod_events(struct npool *nsp, struct niod *nsi, int ev);
+void process_event(struct npool *nsp, gh_list_t *evlist, struct nevent *nse, int ev);
+void process_expired_events(struct npool *nsp);
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+int pcap_read_on_nonselect(struct npool *nsp);
+#endif
+#endif
+
+/* defined in nsock_event.c */
+void update_first_events(struct nevent *nse);
+
+
+extern struct timeval nsock_tod;
+
+
+/*
+ * Engine specific data structure
+ */
+struct kqueue_engine_info {
+  int kqfd;
+  int maxfd;
+  size_t evlen;
+  struct kevent *events;
+};
+
+
+int kqueue_init(struct npool *nsp) {
+  struct kqueue_engine_info *kinfo;
+
+  kinfo = (struct kqueue_engine_info *)safe_malloc(sizeof(struct kqueue_engine_info));
+
+  kinfo->kqfd = kqueue();
+  kinfo->maxfd = -1;
+  kinfo->evlen = INITIAL_EV_COUNT;
+  kinfo->events = (struct kevent *)safe_malloc(INITIAL_EV_COUNT * sizeof(struct kevent));
+
+  nsp->engine_data = (void *)kinfo;
+
+  return 1;
+}
+
+void kqueue_destroy(struct npool *nsp) {
+  struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
+
+  assert(kinfo != NULL);
+  close(kinfo->kqfd);
+  free(kinfo->events);
+  free(kinfo);
+}
+
+int kqueue_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev) {
+  struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
+
+  assert(!IOD_PROPGET(iod, IOD_REGISTERED));
+
+  IOD_PROPSET(iod, IOD_REGISTERED);
+  iod->watched_events = EV_NONE;
+
+  kqueue_iod_modify(nsp, iod, nse, ev, EV_NONE);
+
+  if (nsock_iod_get_sd(iod) > kinfo->maxfd)
+    kinfo->maxfd = nsock_iod_get_sd(iod);
+
+  return 1;
+}
+
+int kqueue_iod_unregister(struct npool *nsp, struct niod *iod) {
+  struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
+
+  /* some IODs can be unregistered here if they're associated to an event that was
+   * immediately completed */
+  if (IOD_PROPGET(iod, IOD_REGISTERED)) {
+    kqueue_iod_modify(nsp, iod, NULL, EV_NONE, EV_READ|EV_WRITE);
+    IOD_PROPCLR(iod, IOD_REGISTERED);
+
+    if (nsock_iod_get_sd(iod) == kinfo->maxfd)
+      kinfo->maxfd--;
+  }
+  iod->watched_events = EV_NONE;
+  return 1;
+}
+
+#define EV_SETFLAG(_set, _ev) (((_set) & (_ev)) ? (EV_ADD|EV_ENABLE) : (EV_ADD|EV_DISABLE))
+
+int kqueue_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr) {
+  struct kevent kev[2];
+  int new_events, i;
+  struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
+
+  assert((ev_set & ev_clr) == 0);
+  assert(IOD_PROPGET(iod, IOD_REGISTERED));
+
+  new_events = iod->watched_events;
+  new_events |= ev_set;
+  new_events &= ~ev_clr;
+
+  if (new_events == iod->watched_events)
+    return 1; /* nothing to do */
+
+  i = 0;
+  if ((ev_set ^ ev_clr) & EV_READ) {
+    EV_SET(&kev[i], nsock_iod_get_sd(iod), EVFILT_READ, EV_SETFLAG(ev_set, EV_READ), 0, 0, (void *)iod);
+    i++;
+  }
+  if ((ev_set ^ ev_clr) & EV_WRITE) {
+    EV_SET(&kev[i], nsock_iod_get_sd(iod), EVFILT_WRITE, EV_SETFLAG(ev_set, EV_WRITE), 0, 0, (void *)iod);
+    i++;
+  }
+
+  if (i > 0 && kevent(kinfo->kqfd, kev, i, NULL, 0, NULL) < 0)
+    fatal("Unable to update events for IOD #%lu: %s", iod->id, strerror(errno));
+
+  iod->watched_events = new_events;
+  return 1;
+}
+
+int kqueue_loop(struct npool *nsp, int msec_timeout) {
+  int results_left = 0;
+  int event_msecs; /* msecs before an event goes off */
+  int combined_msecs;
+  struct timespec ts, *ts_p;
+  int sock_err = 0;
+  struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
+
+  assert(msec_timeout >= -1);
+
+  if (nsp->events_pending == 0)
+    return 0; /* No need to wait on 0 events ... */
+
+
+  if (gh_list_count(&nsp->active_iods) > kinfo->evlen) {
+    kinfo->evlen = gh_list_count(&nsp->active_iods) * 2;
+    kinfo->events = (struct kevent *)safe_realloc(kinfo->events, kinfo->evlen * sizeof(struct kevent));
+  }
+
+  do {
+    struct nevent *nse;
+
+    nsock_log_debug_all("wait for events");
+
+    nse = next_expirable_event(nsp);
+    if (!nse)
+      event_msecs = -1; /* None of the events specified a timeout */
+    else
+      event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+    /* Force a low timeout when capturing packets on systems where
+     * the pcap descriptor is not select()able. */
+    if (gh_list_count(&nsp->pcap_read_events) > 0)
+      if (event_msecs > PCAP_POLL_INTERVAL)
+        event_msecs = PCAP_POLL_INTERVAL;
+#endif
+#endif
+
+    /* We cast to unsigned because we want -1 to be very high (since it means no
+     * timeout) */
+    combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
+
+    /* Set up the timeval pointer we will give to kevent() */
+    memset(&ts, 0, sizeof(struct timespec));
+    if (combined_msecs >= 0) {
+      ts.tv_sec = combined_msecs / 1000;
+      ts.tv_nsec = (combined_msecs % 1000) * 1000000L;
+      ts_p = &ts;
+    } else {
+      ts_p = NULL;
+    }
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+    /* do non-blocking read on pcap devices that doesn't support select()
+     * If there is anything read, just leave this loop. */
+    if (pcap_read_on_nonselect(nsp)) {
+      /* okay, something was read. */
+    } else
+#endif
+#endif
+    {
+      results_left = kevent(kinfo->kqfd, NULL, 0, kinfo->events, kinfo->evlen, ts_p);
+      if (results_left == -1)
+        sock_err = socket_errno();
+    }
+
+    gettimeofday(&nsock_tod, NULL); /* Due to kevent delay */
+  } while (results_left == -1 && sock_err == EINTR); /* repeat only if signal occurred */
+
+  if (results_left == -1 && sock_err != EINTR) {
+    nsock_log_error("nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
+    nsp->errnum = sock_err;
+    return -1;
+  }
+
+  iterate_through_event_lists(nsp, results_left);
+
+  return 1;
+}
+
+
+/* ---- INTERNAL FUNCTIONS ---- */
+
+static inline int get_evmask(struct niod *nsi, const struct kevent *kev) {
+  int evmask = EV_NONE;
+
+  /* generate the corresponding event mask with nsock event flags */
+  if (kev->flags & EV_ERROR) {
+    evmask |= EV_EXCEPT;
+
+    if (kev->data == EPIPE && (nsi->watched_events & EV_READ))
+      evmask |= EV_READ;
+  } else {
+    switch (kev->filter) {
+      case EVFILT_READ:
+        evmask |= EV_READ;
+        break;
+
+      case EVFILT_WRITE:
+        evmask |= EV_WRITE;
+        break;
+
+      default:
+        fatal("Unsupported filter value: %d\n", (int)kev->filter);
+    }
+  }
+  return evmask;
+}
+
+/* Iterate through all the event lists (such as connect_events, read_events,
+ * timer_events, etc) and take action for those that have completed (due to
+ * timeout, i/o, etc) */
+void iterate_through_event_lists(struct npool *nsp, int evcount) {
+  int n;
+  struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
+  struct niod *nsi;
+
+  for (n = 0; n < evcount; n++) {
+    struct kevent *kev = &kinfo->events[n];
+
+    nsi = (struct niod *)kev->udata;
+
+    /* process all the pending events for this IOD */
+    process_iod_events(nsp, nsi, get_evmask(nsi, kev));
+
+    IOD_PROPSET(nsi, IOD_PROCESSED);
+  }
+
+  for (n = 0; n < evcount; n++) {
+    struct kevent *kev = &kinfo->events[n];
+
+    nsi = (struct niod *)kev->udata;
+
+    if (nsi->state == NSIOD_STATE_DELETED) {
+      if (IOD_PROPGET(nsi, IOD_PROCESSED)) {
+        IOD_PROPCLR(nsi, IOD_PROCESSED);
+        gh_list_remove(&nsp->active_iods, &nsi->nodeq);
+        gh_list_prepend(&nsp->free_iods, &nsi->nodeq);
+      }
+    }
+  }
+
+  /* iterate through timers and expired events */
+  process_expired_events(nsp);
+}
+
+#endif /* HAVE_KQUEUE */
+
diff --git a/nsock/src/engine_poll.c b/nsock/src/engine_poll.c
new file mode 100644
index 0000000..5a2262a
--- /dev/null
+++ b/nsock/src/engine_poll.c
@@ -0,0 +1,429 @@
+/***************************************************************************
+ * engine_poll.c -- poll(2) based IO engine.                               *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef WIN32
+/* Allow the use of POLLRDHUP, if available. */
+#define _GNU_SOURCE
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#elif WIN32
+#include "nsock_winconfig.h"
+#endif
+
+#if HAVE_POLL
+
+#include <errno.h>
+
+#ifndef WIN32
+#include <poll.h>
+#else
+#include <Winsock2.h>
+#endif /* ^WIN32 */
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+#if HAVE_PCAP
+#include "nsock_pcap.h"
+#endif
+
+#define EV_LIST_INIT_SIZE 1024
+
+#ifdef WIN32
+  #define Poll    WSAPoll
+  #define POLLFD  WSAPOLLFD
+#else
+  #define Poll    poll
+  #define POLLFD  struct pollfd
+#endif
+
+#ifdef WIN32
+  #define POLL_R_FLAGS (POLLIN)
+#else
+  #define POLL_R_FLAGS (POLLIN | POLLPRI)
+#endif /* WIN32 */
+
+#define POLL_W_FLAGS POLLOUT
+#ifdef POLLRDHUP
+  #define POLL_X_FLAGS (POLLERR | POLLHUP | POLLRDHUP)
+#else
+  /* POLLRDHUP was introduced later and might be unavailable on older systems. */
+  #define POLL_X_FLAGS (POLLERR | POLLHUP)
+#endif /* POLLRDHUP */
+
+extern struct io_operations posix_io_operations;
+
+/* --- ENGINE INTERFACE PROTOTYPES --- */
+static int poll_init(struct npool *nsp);
+static void poll_destroy(struct npool *nsp);
+static int poll_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev);
+static int poll_iod_unregister(struct npool *nsp, struct niod *iod);
+static int poll_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr);
+static int poll_loop(struct npool *nsp, int msec_timeout);
+
+
+/* ---- ENGINE DEFINITION ---- */
+struct io_engine engine_poll = {
+  "poll",
+  poll_init,
+  poll_destroy,
+  poll_iod_register,
+  poll_iod_unregister,
+  poll_iod_modify,
+  poll_loop,
+  &posix_io_operations
+};
+
+
+/* --- INTERNAL PROTOTYPES --- */
+static void iterate_through_event_lists(struct npool *nsp);
+
+/* defined in nsock_core.c */
+void process_iod_events(struct npool *nsp, struct niod *nsi, int ev);
+void process_event(struct npool *nsp, gh_list_t *evlist, struct nevent *nse, int ev);
+void process_expired_events(struct npool *nsp);
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+int pcap_read_on_nonselect(struct npool *nsp);
+#endif
+#endif
+
+/* defined in nsock_event.c */
+void update_first_events(struct nevent *nse);
+
+
+extern struct timeval nsock_tod;
+
+
+/*
+ * Engine specific data structure
+ */
+struct poll_engine_info {
+  int capacity;
+  int max_fd;
+  /* index of the highest poll event */
+  POLLFD *events;
+};
+
+
+
+static inline int lower_max_fd(struct poll_engine_info *pinfo) {
+  do {
+    pinfo->max_fd--;
+  } while (pinfo->max_fd >= 0 && pinfo->events[pinfo->max_fd].fd == -1);
+
+  return pinfo->max_fd;
+}
+
+static inline int evlist_grow(struct poll_engine_info *pinfo) {
+  int i;
+
+  i = pinfo->capacity;
+
+  if (pinfo->capacity == 0) {
+    pinfo->capacity = EV_LIST_INIT_SIZE;
+    pinfo->events = (POLLFD *)safe_malloc(sizeof(POLLFD) * pinfo->capacity);
+  } else {
+    pinfo->capacity *= 2;
+    pinfo->events = (POLLFD *)safe_realloc(pinfo->events, sizeof(POLLFD) * pinfo->capacity);
+  }
+
+  while (i < pinfo->capacity) {
+    pinfo->events[i].fd = -1;
+    pinfo->events[i].events = 0;
+    pinfo->events[i].revents = 0;
+    i++;
+  }
+  return pinfo->capacity;
+}
+
+
+int poll_init(struct npool *nsp) {
+  struct poll_engine_info *pinfo;
+
+  pinfo = (struct poll_engine_info *)safe_malloc(sizeof(struct poll_engine_info));
+  pinfo->capacity = 0;
+  pinfo->max_fd = -1;
+  evlist_grow(pinfo);
+
+  nsp->engine_data = (void *)pinfo;
+
+  return 1;
+}
+
+void poll_destroy(struct npool *nsp) {
+  struct poll_engine_info *pinfo = (struct poll_engine_info *)nsp->engine_data;
+
+  assert(pinfo != NULL);
+  free(pinfo->events);
+  free(pinfo);
+}
+
+int poll_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev) {
+  struct poll_engine_info *pinfo = (struct poll_engine_info *)nsp->engine_data;
+  int sd;
+
+  assert(!IOD_PROPGET(iod, IOD_REGISTERED));
+
+  iod->watched_events = ev;
+
+  sd = nsock_iod_get_sd(iod);
+  while (pinfo->capacity < sd + 1)
+    evlist_grow(pinfo);
+
+  pinfo->events[sd].fd = sd;
+  pinfo->events[sd].events = 0;
+  pinfo->events[sd].revents = 0;
+
+  pinfo->max_fd = MAX(pinfo->max_fd, sd);
+
+  if (ev & EV_READ)
+    pinfo->events[sd].events |= POLL_R_FLAGS;
+  if (ev & EV_WRITE)
+    pinfo->events[sd].events |= POLL_W_FLAGS;
+#ifndef WIN32
+  if (ev & EV_EXCEPT)
+    pinfo->events[sd].events |= POLL_X_FLAGS;
+#endif
+
+  IOD_PROPSET(iod, IOD_REGISTERED);
+  return 1;
+}
+
+int poll_iod_unregister(struct npool *nsp, struct niod *iod) {
+  iod->watched_events = EV_NONE;
+
+  /* some IODs can be unregistered here if they're associated to an event that was
+   * immediately completed */
+  if (IOD_PROPGET(iod, IOD_REGISTERED)) {
+    struct poll_engine_info *pinfo = (struct poll_engine_info *)nsp->engine_data;
+    int sd;
+
+    sd = nsock_iod_get_sd(iod);
+    pinfo->events[sd].fd = -1;
+    pinfo->events[sd].events = 0;
+    pinfo->events[sd].revents = 0;
+
+    if (pinfo->max_fd == sd)
+      lower_max_fd(pinfo);
+
+    IOD_PROPCLR(iod, IOD_REGISTERED);
+  }
+  return 1;
+}
+
+int poll_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr) {
+  int sd;
+  int new_events;
+  struct poll_engine_info *pinfo = (struct poll_engine_info *)nsp->engine_data;
+
+  assert((ev_set & ev_clr) == 0);
+  assert(IOD_PROPGET(iod, IOD_REGISTERED));
+
+  new_events = iod->watched_events;
+  new_events |= ev_set;
+  new_events &= ~ev_clr;
+
+  if (new_events == iod->watched_events)
+    return 1; /* nothing to do */
+
+  iod->watched_events = new_events;
+
+  sd = nsock_iod_get_sd(iod);
+
+  pinfo->events[sd].fd = sd;
+  pinfo->events[sd].events = 0;
+
+  /* regenerate the current set of events for this IOD */
+  if (iod->watched_events & EV_READ)
+    pinfo->events[sd].events |= POLL_R_FLAGS;
+  if (iod->watched_events & EV_WRITE)
+    pinfo->events[sd].events |= POLL_W_FLAGS;
+
+  return 1;
+}
+
+int poll_loop(struct npool *nsp, int msec_timeout) {
+  int results_left = 0;
+  int event_msecs; /* msecs before an event goes off */
+  int combined_msecs;
+  int sock_err = 0;
+  struct poll_engine_info *pinfo = (struct poll_engine_info *)nsp->engine_data;
+
+  assert(msec_timeout >= -1);
+
+  if (nsp->events_pending == 0)
+    return 0; /* No need to wait on 0 events ... */
+
+  do {
+    struct nevent *nse;
+
+    nsock_log_debug_all("wait for events");
+
+    nse = next_expirable_event(nsp);
+    if (!nse)
+      event_msecs = -1; /* None of the events specified a timeout */
+    else
+      event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+    /* Force a low timeout when capturing packets on systems where
+     * the pcap descriptor is not select()able. */
+    if (gh_list_count(&nsp->pcap_read_events) > 0)
+      if (event_msecs > PCAP_POLL_INTERVAL)
+        event_msecs = PCAP_POLL_INTERVAL;
+#endif
+#endif
+
+    /* We cast to unsigned because we want -1 to be very high (since it means no
+     * timeout) */
+    combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+    /* do non-blocking read on pcap devices that doesn't support select()
+     * If there is anything read, just leave this loop. */
+    if (pcap_read_on_nonselect(nsp)) {
+      /* okay, something was read. */
+    } else
+#endif
+#endif
+    {
+      results_left = Poll(pinfo->events, pinfo->max_fd + 1, combined_msecs);
+      if (results_left == -1)
+        sock_err = socket_errno();
+    }
+
+    gettimeofday(&nsock_tod, NULL); /* Due to poll delay */
+  } while (results_left == -1 && sock_err == EINTR); /* repeat only if signal occurred */
+
+  if (results_left == -1 && sock_err != EINTR) {
+#ifdef WIN32
+    for (int i = 0; sock_err != EINVAL || i <= pinfo->max_fd; i++) {
+      if (sock_err != EINVAL || pinfo->events[i].fd != -1) {
+#endif
+        nsock_log_error("nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
+        nsp->errnum = sock_err;
+        return -1;
+#ifdef WIN32
+      }
+    }
+#endif
+  }
+
+  iterate_through_event_lists(nsp);
+
+  return 1;
+}
+
+
+/* ---- INTERNAL FUNCTIONS ---- */
+
+static inline int get_evmask(struct npool *nsp, struct niod *nsi) {
+  struct poll_engine_info *pinfo = (struct poll_engine_info *)nsp->engine_data;
+  int sd, evmask = EV_NONE;
+  POLLFD *pev;
+
+  if (nsi->state != NSIOD_STATE_DELETED
+      && nsi->events_pending
+      && IOD_PROPGET(nsi, IOD_REGISTERED)) {
+
+#if HAVE_PCAP
+      if (nsi->pcap)
+        sd = ((mspcap *)nsi->pcap)->pcap_desc;
+      else
+#endif
+        sd = nsi->sd;
+
+      assert(sd < pinfo->capacity);
+      pev = &pinfo->events[sd];
+
+      if (pev->revents & POLL_R_FLAGS)
+        evmask |= EV_READ;
+      if (pev->revents & POLL_W_FLAGS)
+        evmask |= EV_WRITE;
+      if (pev->events && (pev->revents & POLL_X_FLAGS))
+        evmask |= EV_EXCEPT;
+  }
+  return evmask;
+}
+
+/* Iterate through all the event lists (such as connect_events, read_events,
+ * timer_events, etc) and take action for those that have completed (due to
+ * timeout, i/o, etc) */
+void iterate_through_event_lists(struct npool *nsp) {
+  gh_lnode_t *current, *next, *last;
+
+  last = gh_list_last_elem(&nsp->active_iods);
+
+  for (current = gh_list_first_elem(&nsp->active_iods);
+       current != NULL && gh_lnode_prev(current) != last;
+       current = next) {
+    struct niod *nsi = container_of(current, struct niod, nodeq);
+
+    process_iod_events(nsp, nsi, get_evmask(nsp, nsi));
+
+    next = gh_lnode_next(current);
+    if (nsi->state == NSIOD_STATE_DELETED) {
+      gh_list_remove(&nsp->active_iods, current);
+      gh_list_prepend(&nsp->free_iods, current);
+    }
+  }
+
+  /* iterate through timers and expired events */
+  process_expired_events(nsp);
+}
+
+#endif /* HAVE_POLL */
diff --git a/nsock/src/engine_select.c b/nsock/src/engine_select.c
new file mode 100644
index 0000000..edf1b3d
--- /dev/null
+++ b/nsock/src/engine_select.c
@@ -0,0 +1,395 @@
+/***************************************************************************
+ * engine_select.c -- select(2) based IO engine.                           *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef WIN32
+#include <sys/select.h>
+#endif
+
+#include <errno.h>
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+#if HAVE_PCAP
+#include "nsock_pcap.h"
+#endif
+
+extern struct io_operations posix_io_operations;
+
+
+/* --- ENGINE INTERFACE PROTOTYPES --- */
+static int select_init(struct npool *nsp);
+static void select_destroy(struct npool *nsp);
+static int select_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev);
+static int select_iod_unregister(struct npool *nsp, struct niod *iod);
+static int select_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr);
+static int select_loop(struct npool *nsp, int msec_timeout);
+
+
+/* ---- ENGINE DEFINITION ---- */
+struct io_engine engine_select = {
+  "select",
+  select_init,
+  select_destroy,
+  select_iod_register,
+  select_iod_unregister,
+  select_iod_modify,
+  select_loop,
+  &posix_io_operations
+};
+
+
+/* --- INTERNAL PROTOTYPES --- */
+static void iterate_through_event_lists(struct npool *nsp);
+
+/* defined in nsock_core.c */
+void process_event(struct npool *nsp, gh_list_t *evlist, struct nevent *nse, int ev);
+void process_iod_events(struct npool *nsp, struct niod *nsi, int ev);
+void process_expired_events(struct npool *nsp);
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+int pcap_read_on_nonselect(struct npool *nsp);
+#endif
+#endif
+
+/* defined in nsock_event.c */
+void update_first_events(struct nevent *nse);
+
+
+extern struct timeval nsock_tod;
+
+
+/*
+ * Engine specific data structure
+ */
+struct select_engine_info {
+  /* Descriptors which have pending READ events */
+  fd_set fds_master_r;
+
+  /* Descriptors we are trying to WRITE to */
+  fd_set fds_master_w;
+
+  /* Looking for exceptional events -- used with connect */
+  fd_set fds_master_x;
+
+  /* For keeping track of the select results */
+  fd_set fds_results_r, fds_results_w, fds_results_x;
+
+  /* The highest sd we have set in any of our fd_set's (max_sd + 1 is used in
+   * select() calls).  Note that it can be -1, when there are no valid sockets */
+  int max_sd;
+};
+
+
+int select_init(struct npool *nsp) {
+  struct select_engine_info *sinfo;
+
+  sinfo = (struct select_engine_info *)safe_malloc(sizeof(struct select_engine_info));
+
+  FD_ZERO(&sinfo->fds_master_r);
+  FD_ZERO(&sinfo->fds_master_w);
+  FD_ZERO(&sinfo->fds_master_x);
+
+  sinfo->max_sd = -1;
+
+  nsp->engine_data = (void *)sinfo;
+
+  return 1;
+}
+
+void select_destroy(struct npool *nsp) {
+  assert(nsp->engine_data != NULL);
+  free(nsp->engine_data);
+}
+
+int select_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev) {
+  assert(!IOD_PROPGET(iod, IOD_REGISTERED));
+
+  iod->watched_events = ev;
+  select_iod_modify(nsp, iod, nse, ev, EV_NONE);
+  IOD_PROPSET(iod, IOD_REGISTERED);
+  return 1;
+}
+
+int select_iod_unregister(struct npool *nsp, struct niod *iod) {
+  struct select_engine_info *sinfo = (struct select_engine_info *)nsp->engine_data;
+
+  iod->watched_events = EV_NONE;
+
+  /* some IODs can be unregistered here if they're associated to an event that was
+   * immediately completed */
+  if (IOD_PROPGET(iod, IOD_REGISTERED)) {
+#if HAVE_PCAP
+    if (iod->pcap) {
+      int sd = ((mspcap *)iod->pcap)->pcap_desc;
+      if (sd >= 0) {
+        checked_fd_clr(sd, &sinfo->fds_master_r);
+        checked_fd_clr(sd, &sinfo->fds_results_r);
+      }
+    } else
+#endif
+    {
+      checked_fd_clr(iod->sd, &sinfo->fds_master_r);
+      checked_fd_clr(iod->sd, &sinfo->fds_master_w);
+      checked_fd_clr(iod->sd, &sinfo->fds_master_x);
+      checked_fd_clr(iod->sd, &sinfo->fds_results_r);
+      checked_fd_clr(iod->sd, &sinfo->fds_results_w);
+      checked_fd_clr(iod->sd, &sinfo->fds_results_x);
+    }
+
+    if (sinfo->max_sd == iod->sd)
+      sinfo->max_sd--;
+
+    IOD_PROPCLR(iod, IOD_REGISTERED);
+  }
+  return 1;
+}
+
+int select_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr) {
+  int sd;
+  struct select_engine_info *sinfo = (struct select_engine_info *)nsp->engine_data;
+
+  assert((ev_set & ev_clr) == 0);
+
+  iod->watched_events |= ev_set;
+  iod->watched_events &= ~ev_clr;
+
+  ev_set |= EV_EXCEPT;
+  ev_clr &= ~EV_EXCEPT;
+
+  sd = nsock_iod_get_sd(iod);
+
+  /* -- set events -- */
+  if (ev_set & EV_READ)
+    checked_fd_set(sd, &sinfo->fds_master_r);
+
+  if (ev_set & EV_WRITE)
+    checked_fd_set(sd, &sinfo->fds_master_w);
+
+  if (ev_set & EV_EXCEPT)
+    checked_fd_set(sd, &sinfo->fds_master_x);
+
+  /* -- clear events -- */
+  if (ev_clr & EV_READ)
+    checked_fd_clr(sd, &sinfo->fds_master_r);
+
+  if (ev_clr & EV_WRITE)
+    checked_fd_clr(sd, &sinfo->fds_master_w);
+
+  if (ev_clr & EV_EXCEPT)
+    checked_fd_clr(sd, &sinfo->fds_master_x);
+
+
+  /* -- update max_sd -- */
+  if (ev_set != EV_NONE)
+    sinfo->max_sd = MAX(sinfo->max_sd, sd);
+  else if (ev_clr != EV_NONE && iod->events_pending == 1 && (sinfo->max_sd == sd))
+    sinfo->max_sd--;
+
+  return 1;
+}
+
+int select_loop(struct npool *nsp, int msec_timeout) {
+  int results_left = 0;
+  int event_msecs; /* msecs before an event goes off */
+  int combined_msecs;
+  int sock_err = 0;
+  struct timeval select_tv;
+  struct timeval *select_tv_p;
+  struct select_engine_info *sinfo = (struct select_engine_info *)nsp->engine_data;
+
+  assert(msec_timeout >= -1);
+
+  if (nsp->events_pending == 0)
+    return 0; /* No need to wait on 0 events ... */
+
+  do {
+    struct nevent *nse;
+
+    nsock_log_debug_all("wait for events");
+
+    nse = next_expirable_event(nsp);
+    if (!nse)
+      event_msecs = -1; /* None of the events specified a timeout */
+    else
+      event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+    /* Force a low timeout when capturing packets on systems where
+     * the pcap descriptor is not select()able. */
+    if (gh_list_count(&nsp->pcap_read_events))
+      if (event_msecs > PCAP_POLL_INTERVAL)
+        event_msecs = PCAP_POLL_INTERVAL;
+#endif
+#endif
+
+    /* We cast to unsigned because we want -1 to be very high (since it means no
+     * timeout) */
+    combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
+
+    /* Set up the timeval pointer we will give to select() */
+    memset(&select_tv, 0, sizeof(select_tv));
+    if (combined_msecs > 0) {
+      select_tv.tv_sec = combined_msecs / 1000;
+      select_tv.tv_usec = (combined_msecs % 1000) * 1000;
+      select_tv_p = &select_tv;
+    } else if (combined_msecs == 0) {
+      /* we want the tv_sec and tv_usec to be zero but they already are from bzero */
+      select_tv_p = &select_tv;
+    } else {
+      assert(combined_msecs == -1);
+      select_tv_p = NULL;
+    }
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+    /* do non-blocking read on pcap devices that doesn't support select()
+     * If there is anything read, just leave this loop. */
+    if (pcap_read_on_nonselect(nsp)) {
+      /* okay, something was read. */
+    } else
+#endif
+#endif
+    {
+      /* Set up the descriptors for select */
+      sinfo->fds_results_r = sinfo->fds_master_r;
+      sinfo->fds_results_w = sinfo->fds_master_w;
+      sinfo->fds_results_x = sinfo->fds_master_x;
+
+      results_left = fselect(sinfo->max_sd + 1, &sinfo->fds_results_r,
+                             &sinfo->fds_results_w, &sinfo->fds_results_x, select_tv_p);
+
+      if (results_left == -1)
+        sock_err = socket_errno();
+    }
+
+    gettimeofday(&nsock_tod, NULL); /* Due to select delay */
+  } while (results_left == -1 && sock_err == EINTR); /* repeat only if signal occurred */
+
+  if (results_left == -1 && sock_err != EINTR) {
+    nsock_log_error("nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
+    nsp->errnum = sock_err;
+    return -1;
+  }
+
+  iterate_through_event_lists(nsp);
+
+  return 1;
+}
+
+
+/* ---- INTERNAL FUNCTIONS ---- */
+
+static inline int get_evmask(const struct npool *nsp, const struct niod *nsi) {
+  struct select_engine_info *sinfo = (struct select_engine_info *)nsp->engine_data;
+  int sd, evmask;
+
+  evmask = EV_NONE;
+
+#if HAVE_PCAP
+#ifndef PCAP_CAN_DO_SELECT
+  if (nsi->pcap) {
+    /* Always assume readable for a non-blocking read. We can't check checked_fd_isset
+       because we don't have a pcap_desc. */
+    evmask |= EV_READ;
+    return evmask;
+  }
+#endif
+#endif
+
+#if HAVE_PCAP
+  if (nsi->pcap)
+    sd = ((mspcap *)nsi->pcap)->pcap_desc;
+  else
+#endif
+    sd = nsi->sd;
+
+  assert(sd >= 0);
+
+  if (checked_fd_isset(sd, &sinfo->fds_results_r))
+    evmask |= EV_READ;
+  if (checked_fd_isset(sd, &sinfo->fds_results_w))
+    evmask |= EV_WRITE;
+  if (checked_fd_isset(sd, &sinfo->fds_results_x))
+    evmask |= EV_EXCEPT;
+
+  return evmask;
+}
+
+/* Iterate through all the event lists (such as connect_events, read_events,
+ * timer_events, etc) and take action for those that have completed (due to
+ * timeout, i/o, etc) */
+void iterate_through_event_lists(struct npool *nsp) {
+  gh_lnode_t *current, *next, *last;
+
+  last = gh_list_last_elem(&nsp->active_iods);
+
+  for (current = gh_list_first_elem(&nsp->active_iods);
+       current != NULL && gh_lnode_prev(current) != last;
+       current = next) {
+    struct niod *nsi = container_of(current, struct niod, nodeq);
+
+    if (nsi->state != NSIOD_STATE_DELETED && nsi->events_pending)
+      process_iod_events(nsp, nsi, get_evmask(nsp, nsi));
+
+    next = gh_lnode_next(current);
+    if (nsi->state == NSIOD_STATE_DELETED) {
+      gh_list_remove(&nsp->active_iods, current);
+      gh_list_prepend(&nsp->free_iods, current);
+    }
+  }
+
+  /* iterate through timers and expired events */
+  process_expired_events(nsp);
+}
diff --git a/nsock/src/error.c b/nsock/src/error.c
new file mode 100644
index 0000000..c7ecf98
--- /dev/null
+++ b/nsock/src/error.c
@@ -0,0 +1,85 @@
+/***************************************************************************
+ * error.c -- a few simple routines for dealing with errors (quitting,     *
+ * printing error messages, etc.                                           *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "error.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+void fatal(char *fmt, ...) {
+  va_list ap;
+
+  va_start(ap, fmt);
+  fflush(stdout);
+  vfprintf(stderr, fmt, ap);
+  fprintf(stderr, "\n");
+  va_end(ap);
+
+  exit(1);
+}
+
+void pfatal(char *fmt, ...) {
+  va_list ap;
+
+  va_start(ap, fmt);
+  fflush(stdout);
+  vfprintf(stderr, fmt, ap);
+  fprintf(stderr, ": ");
+  perror("");
+  fprintf(stderr, "\n");
+  va_end(ap);
+
+  exit(1);
+}
+
diff --git a/nsock/src/error.h b/nsock/src/error.h
new file mode 100644
index 0000000..48a7684
--- /dev/null
+++ b/nsock/src/error.h
@@ -0,0 +1,87 @@
+/***************************************************************************
+ * error.h -- a few simple routines for dealing with errors (quitting,     *
+ * printing error messages, etc.                                           *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef ERROR_H
+#define ERROR_H
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#include "nbase_config.h"
+#endif
+
+#ifdef WIN32
+#include "nbase_winconfig.h"
+#endif
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#if defined(__GNUC__)
+#define NORETURN __attribute__((noreturn))
+#elif defined(_MSC_VER)
+#define NORETURN __declspec(noreturn)
+#else
+#define NORETURN
+#endif
+
+NORETURN void fatal(char *fmt, ...)
+  __attribute__ ((format (printf, 1, 2)));
+
+NORETURN void pfatal(char *fmt, ...)
+  __attribute__ ((format (printf, 1, 2)));
+
+#endif /* ERROR_H */
diff --git a/nsock/src/filespace.c b/nsock/src/filespace.c
new file mode 100644
index 0000000..f4d5638
--- /dev/null
+++ b/nsock/src/filespace.c
@@ -0,0 +1,114 @@
+/***************************************************************************
+ * filespace.c -- a simple mechanism for storing dynamic amounts of data   *
+ * in a simple to use, and quick to append-to structure.                   *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock_internal.h"
+#include "filespace.h"
+
+#include <string.h>
+
+#define FS_INITSIZE_DEFAULT 1024
+
+
+/* Assumes space for fs has already been allocated */
+int filespace_init(struct filespace *fs, int initial_size) {
+  memset(fs, 0, sizeof(struct filespace));
+  if (initial_size == 0)
+    initial_size = FS_INITSIZE_DEFAULT;
+
+  fs->current_alloc = initial_size;
+  fs->str = (char *)safe_malloc(fs->current_alloc);
+  fs->str[0] = '\0';
+  fs->pos = fs->str;
+  return 0;
+}
+
+int fs_free(struct filespace *fs) {
+  if (fs->str)
+    free(fs->str);
+
+  fs->current_alloc = fs->current_size = 0;
+  fs->pos = fs->str = NULL;
+  return 0;
+}
+
+/* Concatenate a string to the end of a filespace */
+int fs_cat(struct filespace *fs, const char *str, int len) {
+  if (len < 0)
+    return -1;
+
+  if (len == 0)
+    return 0;
+
+  if (fs->current_alloc - fs->current_size < len + 2) {
+    char *tmpstr;
+
+    fs->current_alloc = (int)(fs->current_alloc * 1.4 + 1);
+    fs->current_alloc += 100 + len;
+
+    tmpstr = (char *)safe_malloc(fs->current_alloc);
+    memcpy(tmpstr, fs->str, fs->current_size);
+
+    fs->pos = (fs->pos - fs->str) + tmpstr;
+
+    if (fs->str)
+      free(fs->str);
+
+    fs->str = tmpstr;
+  }
+  memcpy(fs->str + fs->current_size, str, len);
+
+  fs->current_size += len;
+  fs->str[fs->current_size] = '\0';
+  return 0;
+}
+
diff --git a/nsock/src/filespace.h b/nsock/src/filespace.h
new file mode 100644
index 0000000..cc44a9a
--- /dev/null
+++ b/nsock/src/filespace.h
@@ -0,0 +1,102 @@
+/***************************************************************************
+ * filespace.h -- a simple mechanism for storing dynamic amounts of data   *
+ * in a simple to use, and quick to append-to structure.                   *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef FILESPACE_H
+#define FILESPACE_H
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#include "nbase_config.h"
+#endif
+
+#ifdef WIN32
+#include "nbase_winconfig.h"
+#endif
+
+#include <stdlib.h>
+#include <stdarg.h>
+#if HAVE_STRING_H
+#include <string.h>
+#endif
+#if HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
+
+struct filespace {
+  int current_size;
+  int current_alloc;
+
+  /* Current position in the filespace */
+  char *pos;
+  char *str;
+};
+
+
+static inline int fs_length(const struct filespace *fs) {
+  return fs->current_size;
+}
+
+static inline char *fs_str(const struct filespace *fs) {
+  return fs->str;
+}
+
+
+int filespace_init(struct filespace *fs, int initial_size);
+
+int fs_free(struct filespace *fs);
+
+int fs_cat(struct filespace *fs, const char *str, int len);
+
+#endif /* FILESPACE_H */
+
diff --git a/nsock/src/gh_heap.c b/nsock/src/gh_heap.c
new file mode 100644
index 0000000..2176574
--- /dev/null
+++ b/nsock/src/gh_heap.c
@@ -0,0 +1,250 @@
+/***************************************************************************
+ * gh_heap.c -- heap based priority queue.                                 *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#include "nbase_config.h"
+#endif
+
+#ifdef WIN32
+#include "nbase_winconfig.h"
+#endif
+
+#include <nbase.h>
+#include "gh_heap.h"
+
+#define GH_SLOTS   128
+
+
+static gh_hnode_t **hnode_ptr(gh_heap_t *heap, unsigned int index) {
+  assert(index <= heap->count);
+  gh_hnode_t **ptr = &(heap->slots[index]);
+  assert(index == heap->count || (*ptr)->index == index);
+  return ptr;
+}
+
+gh_hnode_t *gh_heap_find(gh_heap_t *heap, unsigned int index) {
+  if (index >= heap->count)
+    return NULL;
+
+  return *hnode_ptr(heap, index);
+}
+
+static int hnode_up(gh_heap_t *heap, gh_hnode_t *hnode)
+{
+  unsigned int cur_idx = hnode->index;
+  gh_hnode_t **cur_ptr = hnode_ptr(heap, cur_idx);
+  unsigned int parent_idx;
+  gh_hnode_t **parent_ptr;
+  int action = 0;
+
+  assert(*cur_ptr == hnode);
+
+  while (cur_idx > 0) {
+    parent_idx = (cur_idx - 1) >> 1;
+
+    parent_ptr = hnode_ptr(heap, parent_idx);
+
+    if (heap->cmp_op(*parent_ptr, hnode))
+      break;
+
+    (*parent_ptr)->index = cur_idx;
+    *cur_ptr = *parent_ptr;
+    cur_ptr = parent_ptr;
+    cur_idx = parent_idx;
+    action = 1;
+  }
+
+  hnode->index = cur_idx;
+  *cur_ptr = hnode;
+
+  return action;
+}
+
+static int hnode_down(gh_heap_t *heap, gh_hnode_t *hnode)
+{
+  unsigned int count = heap->count;
+  unsigned int ch1_idx, ch2_idx, cur_idx;
+  gh_hnode_t **ch1_ptr, **ch2_ptr, **cur_ptr;
+  gh_hnode_t  *ch1, *ch2;
+  int action = 0;
+
+  cur_idx = hnode->index;
+  cur_ptr = hnode_ptr(heap, cur_idx);
+  assert(*cur_ptr == hnode);
+
+  while (cur_idx < count) {
+    ch1_idx = (cur_idx << 1) + 1;
+    if (ch1_idx >= count)
+      break;
+
+    ch1_ptr = hnode_ptr(heap, ch1_idx);
+    ch1 = *ch1_ptr;
+
+    ch2_idx = ch1_idx + 1;
+    if (ch2_idx < count) {
+      ch2_ptr = hnode_ptr(heap, ch2_idx);
+      ch2 = *ch2_ptr;
+
+      if (heap->cmp_op(ch2, ch1)) {
+        ch1_idx = ch2_idx;
+        ch1_ptr = ch2_ptr;
+        ch1 = ch2;
+      }
+    }
+
+    assert(ch1->index == ch1_idx);
+
+    if (heap->cmp_op(hnode, ch1))
+      break;
+
+    ch1->index = cur_idx;
+    *cur_ptr = ch1;
+    cur_ptr = ch1_ptr;
+    cur_idx = ch1_idx;
+    action = 1;
+  }
+
+  hnode->index = cur_idx;
+  *cur_ptr = hnode;
+
+  return action;
+}
+
+static int heap_grow(gh_heap_t *heap) {
+  int newsize;
+
+  /* Do we really need to grow? */
+  assert(heap->count == heap->highwm);
+
+  newsize = heap->count + GH_SLOTS;
+  heap->slots = (gh_hnode_t **)safe_realloc(heap->slots,
+                                            newsize * sizeof(gh_hnode_t *));
+  heap->highwm += GH_SLOTS;
+  memset(heap->slots + heap->count, 0, GH_SLOTS * sizeof(gh_hnode_t *));
+  return 0;
+}
+
+int gh_heap_init(gh_heap_t *heap, gh_heap_cmp_t cmp_op) {
+  int rc;
+
+  if (!cmp_op)
+      return -1;
+
+  heap->cmp_op = cmp_op;
+  heap->count  = 0;
+  heap->highwm = 0;
+  heap->slots  = NULL;
+
+  rc = heap_grow(heap);
+  if (rc)
+    gh_heap_free(heap);
+
+  return rc;
+}
+
+void gh_heap_free(gh_heap_t *heap) {
+  if (heap->highwm) {
+    assert(heap->slots);
+    free(heap->slots);
+  }
+  memset(heap, 0, sizeof(gh_heap_t));
+}
+
+int gh_heap_push(gh_heap_t *heap, gh_hnode_t *hnode) {
+  gh_hnode_t **new_ptr;
+  unsigned int new_index = heap->count;
+
+  assert(!gh_hnode_is_valid(hnode));
+
+  if (new_index == heap->highwm)
+    heap_grow(heap);
+
+  hnode->index = new_index;
+  new_ptr = hnode_ptr(heap, new_index);
+  assert(*new_ptr == NULL);
+  heap->count++;
+  *new_ptr = hnode;
+
+  hnode_up(heap, hnode);
+  return 0;
+}
+
+int gh_heap_remove(gh_heap_t *heap, gh_hnode_t *hnode)
+{
+  unsigned int count = heap->count;
+  unsigned int cur_idx = hnode->index;
+  gh_hnode_t **cur_ptr;
+  gh_hnode_t *last;
+
+  assert(gh_hnode_is_valid(hnode));
+  assert(cur_idx < count);
+
+  cur_ptr = hnode_ptr(heap, cur_idx);
+  assert(*cur_ptr == hnode);
+
+  count--;
+  last = *hnode_ptr(heap, count);
+  heap->count = count;
+  if (last != hnode)
+  {
+    last->index = cur_idx;
+    *cur_ptr = last;
+    if (!hnode_up(heap, *cur_ptr))
+      hnode_down(heap, *cur_ptr);
+  }
+
+  gh_hnode_invalidate(hnode);
+  cur_ptr = hnode_ptr(heap, count);
+  *cur_ptr = NULL;
+  return 0;
+}
diff --git a/nsock/src/gh_heap.h b/nsock/src/gh_heap.h
new file mode 100644
index 0000000..0e67d9c
--- /dev/null
+++ b/nsock/src/gh_heap.h
@@ -0,0 +1,143 @@
+/***************************************************************************
+ * gh_heap.h -- heap based priority queues.                                *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef GH_HEAP_H
+#define GH_HEAP_H
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#include "nbase_config.h"
+#endif
+
+#ifdef WIN32
+#include "nbase_winconfig.h"
+#endif
+
+#include "error.h"
+#include <assert.h>
+
+
+#if !defined(container_of)
+#include <stddef.h>
+
+#define container_of(ptr, type, member) \
+        ((type *)((char *)(ptr) - offsetof(type, member)))
+#endif
+
+
+typedef struct {
+  unsigned int index;
+} gh_hnode_t;
+
+/* POISON value, set heap node index to this value to indicate that the node is
+ * inactive (not part of a heap) */
+#define GH_HEAP_GUARD  0x19890721
+
+/* Node comparison function.
+ * Here lies all the intelligence of the tree.
+ * Return 1 if hnode1 < hnode2, 0 otherwise. */
+typedef int (*gh_heap_cmp_t)(gh_hnode_t *hnode1, gh_hnode_t *hnode2);
+
+
+typedef struct gh_heap {
+  gh_heap_cmp_t cmp_op;
+  unsigned int count;
+  unsigned int highwm;
+  gh_hnode_t **slots;
+} gh_heap_t;
+
+
+int gh_heap_init(gh_heap_t *heap, gh_heap_cmp_t cmp_op);
+
+void gh_heap_free(gh_heap_t *heap);
+
+int gh_heap_push(gh_heap_t *heap, gh_hnode_t *node);
+
+int gh_heap_remove(gh_heap_t *heap, gh_hnode_t *node);
+
+gh_hnode_t *gh_heap_find(gh_heap_t *heap, unsigned int index);
+
+
+static inline gh_hnode_t *gh_heap_min(gh_heap_t *heap) {
+  if (heap->count == 0)
+    return NULL;
+
+  return gh_heap_find(heap, 0);
+}
+
+static inline gh_hnode_t *gh_heap_pop(gh_heap_t *heap) {
+  gh_hnode_t *hnode;
+
+  hnode = gh_heap_find(heap, 0);
+  if (hnode != NULL)
+    gh_heap_remove(heap, hnode);
+
+  return hnode;
+}
+
+static inline size_t gh_heap_count(gh_heap_t *heap) {
+  return heap->count;
+}
+
+static inline int gh_heap_is_empty(gh_heap_t *heap) {
+  return heap->count == 0;
+}
+
+static inline void gh_hnode_invalidate(gh_hnode_t *node) {
+  node->index = GH_HEAP_GUARD;
+}
+
+static inline int gh_hnode_is_valid(const gh_hnode_t *node) {
+  return (node && node->index != GH_HEAP_GUARD);
+}
+
+#endif /* GH_HEAP_H */
diff --git a/nsock/src/gh_list.h b/nsock/src/gh_list.h
new file mode 100644
index 0000000..32f383e
--- /dev/null
+++ b/nsock/src/gh_list.h
@@ -0,0 +1,296 @@
+/***************************************************************************
+ * gh_list.h -- a simple doubly-linked list implementation.                *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef GH_LIST_H
+#define GH_LIST_H
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#include "nbase_config.h"
+#endif
+
+#ifdef WIN32
+#include "nbase_winconfig.h"
+#endif
+
+#include "error.h"
+#include <assert.h>
+
+#define GH_LIST_MAGIC       0xBADFACE
+#ifndef GH_LIST_PARANOID
+#define GH_LIST_PARANOID    0
+#endif
+
+
+typedef struct gh_list_node {
+  struct gh_list_node *next;
+  struct gh_list_node *prev;
+} gh_lnode_t;
+
+typedef struct gh_list {
+  /* Number of elements in the list */
+  unsigned int count;
+  gh_lnode_t *first;
+  gh_lnode_t *last;
+} gh_list_t;
+
+
+/* That one's an efficiency killer but it should reveal
+ * any inconsistency in nsock's lists management. To be
+ * called on every list we get and return. */
+static inline void paranoid_list_check(gh_list_t *list) {
+#if GH_LIST_PARANOID
+  switch (list->count) {
+    case 0:
+      assert(list->first == NULL);
+      assert(list->last == NULL);
+      break;
+
+    case 1:
+      assert(list->first);
+      assert(list->last);
+      assert(list->first == list->last);
+      break;
+
+    default:
+      assert(list->first);
+      assert(list->last);
+      assert(list->first != list->last);
+      break;
+  }
+#endif
+}
+
+static inline int gh_list_init(gh_list_t *newlist) {
+  newlist->count = 0;
+  newlist->first = NULL;
+  newlist->last  = NULL;
+  return 0;
+}
+
+static inline int gh_list_append(gh_list_t *list, gh_lnode_t *lnode) {
+  gh_lnode_t *oldlast;
+
+  paranoid_list_check(list);
+
+  oldlast = list->last;
+  if (oldlast)
+    oldlast->next = lnode;
+
+  lnode->prev = oldlast;
+  lnode->next = NULL;
+
+  list->count++;
+  list->last = lnode;
+
+  if (list->count == 1)
+    list->first = lnode;
+
+  paranoid_list_check(list);
+  return 0;
+}
+
+static inline int gh_list_prepend(gh_list_t *list, gh_lnode_t *lnode) {
+  gh_lnode_t *oldfirst;
+
+  paranoid_list_check(list);
+
+  oldfirst = list->first;
+  if (oldfirst)
+    oldfirst->prev = lnode;
+
+  lnode->next = oldfirst;
+  lnode->prev = NULL;
+
+  list->count++;
+  list->first = lnode;
+
+  if (list->count == 1)
+    list->last = lnode;
+
+  paranoid_list_check(list);
+  return 0;
+}
+
+static inline int gh_list_insert_before(gh_list_t *list, gh_lnode_t *before,
+                                        gh_lnode_t *lnode) {
+  paranoid_list_check(list);
+
+  lnode->prev = before->prev;
+  lnode->next = before;
+
+  if (before->prev)
+    before->prev->next = lnode;
+  else
+    list->first = lnode;
+
+  before->prev = lnode;
+  list->count++;
+
+  paranoid_list_check(list);
+  return 0;
+}
+
+static inline gh_lnode_t *gh_list_pop(gh_list_t *list) {
+  gh_lnode_t *elem;
+
+  paranoid_list_check(list);
+
+  elem = list->first;
+  if (!elem) {
+    paranoid_list_check(list);
+    return NULL;
+  }
+
+  list->first = list->first->next;
+  if (list->first)
+    list->first->prev = NULL;
+
+  list->count--;
+
+  if (list->count < 2)
+    list->last = list->first;
+
+  elem->prev = NULL;
+  elem->next = NULL;
+
+  paranoid_list_check(list);
+  return elem;
+}
+
+static inline int gh_list_remove(gh_list_t *list, gh_lnode_t *lnode) {
+  paranoid_list_check(list);
+
+  if (lnode->prev) {
+    lnode->prev->next = lnode->next;
+  } else {
+    assert(list->first == lnode);
+    list->first = lnode->next;
+  }
+
+  if (lnode->next) {
+    lnode->next->prev = lnode->prev;
+  } else {
+    assert(list->last == lnode);
+    list->last = lnode->prev;
+  }
+
+  lnode->prev = NULL;
+  lnode->next = NULL;
+
+  list->count--;
+
+  paranoid_list_check(list);
+  return 0;
+}
+
+static inline int gh_list_free(gh_list_t *list) {
+  paranoid_list_check(list);
+
+  while (list->count > 0)
+    gh_list_pop(list);
+
+  paranoid_list_check(list);
+  memset(list, 0, sizeof(gh_list_t));
+  return 0;
+}
+
+static inline int gh_list_move_front(gh_list_t *list, gh_lnode_t *lnode) {
+  paranoid_list_check(list);
+  if (list->first == lnode)
+    return 0;
+
+  /* remove element from its current position */
+  lnode->prev->next = lnode->next;
+
+  if (lnode->next) {
+    lnode->next->prev = lnode->prev;
+  } else {
+    assert(list->last == lnode);
+    list->last = lnode->prev;
+  }
+
+  /* add element to the beginning of the list */
+  list->first->prev = lnode;
+  lnode->next = list->first;
+  lnode->prev = NULL;
+  list->first = lnode;
+
+  paranoid_list_check(list);
+  return 0;
+}
+
+/* Take a LIST ELEMENT (not just the data) and return the next one */
+static inline gh_lnode_t *gh_lnode_next(gh_lnode_t *elem) {
+  return elem->next;
+}
+
+/* Same as above but return the previous element */
+static inline gh_lnode_t *gh_lnode_prev(gh_lnode_t *elem) {
+  return elem->prev;
+}
+
+/* Take a LIST (not a list element) and return the first element */
+static inline gh_lnode_t *gh_list_first_elem(gh_list_t *list) {
+  return list->first;
+}
+
+/* Same as above but return the last element */
+static inline gh_lnode_t *gh_list_last_elem(gh_list_t *list) {
+  return list->last;
+}
+
+static inline unsigned int gh_list_count(gh_list_t *list) {
+  return list->count;
+}
+
+#endif /* GH_LIST_H */
diff --git a/nsock/src/netutils.c b/nsock/src/netutils.c
new file mode 100644
index 0000000..4523203
--- /dev/null
+++ b/nsock/src/netutils.c
@@ -0,0 +1,183 @@
+/***************************************************************************
+ * netutils.c -- This contains some useful little network/socket related   *
+ * utility functions.                                                      *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "netutils.h"
+#include "error.h"
+
+#if WIN32
+#include "Winsock2.h"
+#endif
+
+#if HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#if HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#if HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#if HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+
+static int netutils_debugging = 0;
+
+/* maximize the number of file descriptors (including sockets) allowed for this
+ * process and return that maximum value (note -- you better not actually open
+ * this many -- stdin, stdout, other files opened by libraries you use, etc. all
+ * count toward this limit.  Leave a little slack */
+rlim_t maximize_fdlimit(void) {
+
+#ifndef WIN32
+  struct rlimit r;
+  static int maxfds_set = 0;
+  static rlim_t maxfds = 0;
+
+  if (maxfds_set)
+    return maxfds;
+
+#ifndef RLIMIT_NOFILE
+ #ifdef RLIMIT_OFILE
+  #define RLIMIT_NOFILE RLIMIT_OFILE
+ #else
+  #error Neither RLIMIT_NOFILE nor RLIMIT_OFILE defined
+ #endif
+#endif
+  if (!getrlimit(RLIMIT_NOFILE, &r)) {
+    maxfds = r.rlim_cur;
+    r.rlim_cur = r.rlim_max;
+    if (!setrlimit(RLIMIT_NOFILE, &r))
+      if (netutils_debugging)
+        perror("setrlimit RLIMIT_NOFILE failed");
+
+    if (!getrlimit(RLIMIT_NOFILE, &r)) {
+      maxfds = r.rlim_cur;
+    }
+    maxfds_set = 1;
+    return maxfds;
+  }
+#endif /* !WIN32 */
+  return 0;
+}
+
+#if HAVE_SYS_UN_H
+  #define PEER_STR_LEN sizeof(((struct sockaddr_un *) 0)->sun_path)
+#else
+  #define PEER_STR_LEN sizeof("[ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255]:xxxxx")
+#endif
+
+#if HAVE_SYS_UN_H
+/* Get the UNIX domain socket path or empty string if the address family != AF_UNIX. */
+const char *get_unixsock_path(const struct sockaddr_storage *addr) {
+  struct sockaddr_un *su = (struct sockaddr_un *)addr;
+
+  if (!addr || addr->ss_family != AF_UNIX)
+    return "";
+
+  return (const char *)su->sun_path;
+}
+#endif
+
+static int get_port(const struct sockaddr_storage *ss) {
+  if (ss->ss_family == AF_INET)
+    return ntohs(((struct sockaddr_in *) ss)->sin_port);
+#if HAVE_IPV6
+  else if (ss->ss_family == AF_INET6)
+    return ntohs(((struct sockaddr_in6 *) ss)->sin6_port);
+#endif
+
+  return -1;
+}
+
+static char *get_addr_string(const struct sockaddr_storage *ss, size_t sslen) {
+  static char buffer[PEER_STR_LEN];
+
+#if HAVE_SYS_UN_H
+  if (ss->ss_family == AF_UNIX) {
+    sprintf(buffer, "%s", get_unixsock_path(ss));
+    return buffer;
+  }
+#endif
+
+  sprintf(buffer, "%s:%d", inet_ntop_ez(ss, sslen), get_port(ss));
+  return buffer;
+}
+
+/* Get the peer/host address string.
+ * In case we have support for UNIX domain sockets, function returns
+ * string containing path to UNIX socket if the address family is AF_UNIX,
+ * otherwise it returns string containing "<address>:<port>". */
+char *get_peeraddr_string(const struct niod *iod) {
+  if (iod->peerlen > 0)
+    return get_addr_string(&iod->peer, iod->peerlen);
+  else
+    return "peer unspecified";
+}
+
+/* Get the local bind address string. */
+char *get_localaddr_string(const struct niod *iod) {
+  return get_addr_string(&iod->local, iod->locallen);
+}
diff --git a/nsock/src/netutils.h b/nsock/src/netutils.h
new file mode 100644
index 0000000..893a9f6
--- /dev/null
+++ b/nsock/src/netutils.h
@@ -0,0 +1,103 @@
+/***************************************************************************
+ * netutils.h -- This contains some useful little network/socket related   *
+ * utility functions.                                                      *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef NETUTILS_H
+#define NETUTILS_H
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#include "nbase_config.h"
+#endif
+
+#if HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+
+#include "nsock_internal.h"
+
+#ifdef WIN32
+#include "nbase_winconfig.h"
+/* nbase_winunix.h somehow reason.h to get included */
+#include "nbase_winunix.h"
+#endif
+
+#if HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+
+#if HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#else
+#ifndef rlim_t
+#define rlim_t int
+#endif
+#endif
+/* Maximize the number of file descriptors (including sockets) allowed for this
+ * process and return that maximum value (note -- you better not actually open
+ * this many -- stdin, stdout, other files opened by libraries you use, etc. all
+ * count toward this limit.  Leave a little slack */
+rlim_t maximize_fdlimit(void);
+
+/* Get the UNIX domain socket path or empty string if the address family != AF_UNIX. */
+const char *get_unixsock_path(const struct sockaddr_storage *addr);
+
+/* Get the peer address string. In case of a Unix domain socket, returns the
+ * path to UNIX socket, otherwise it returns string containing
+ * "<address>:<port>". */
+char *get_peeraddr_string(const struct niod *iod);
+
+/* Get the local bind address string. */
+char *get_localaddr_string(const struct niod *iod);
+
+#endif /* NETUTILS_H */
+
diff --git a/nsock/src/nsock_connect.c b/nsock/src/nsock_connect.c
new file mode 100644
index 0000000..7d2b523
--- /dev/null
+++ b/nsock/src/nsock_connect.c
@@ -0,0 +1,652 @@
+/***************************************************************************
+ * nsock_connect.c -- This contains the functions for requesting TCP       *
+ * connections from the nsock parallel socket event library                *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include "nsock_proxy.h"
+#include "netutils.h"
+
+#include <sys/types.h>
+#include <errno.h>
+#include <string.h>
+
+
+static int mksock_bind_addr(struct npool *ms, struct niod *iod) {
+  int rc;
+  int one = 1;
+
+  rc = setsockopt(iod->sd, SOL_SOCKET, SO_REUSEADDR, (const char *)&one, sizeof(one));
+  if (rc == -1) {
+    int err = socket_errno();
+
+    nsock_log_error("Setting of SO_REUSEADDR failed (#%li): %s (%d)", iod->id,
+                    socket_strerror(err), err);
+  }
+
+  nsock_log_info("Binding to %s (IOD #%li)", get_localaddr_string(iod), iod->id);
+  rc = bind(iod->sd, (struct sockaddr *)&iod->local, (int) iod->locallen);
+  if (rc == -1) {
+    int err = socket_errno();
+
+    nsock_log_error("Bind to %s failed (IOD #%li): %s (%d)",
+                    get_localaddr_string(iod), iod->id,
+                    socket_strerror(err), err);
+  }
+  return 0;
+}
+
+static int mksock_set_ipopts(struct npool *ms, struct niod *iod) {
+  int rc;
+
+  errno = 0;
+  rc = setsockopt(iod->sd, IPPROTO_IP, IP_OPTIONS, (const char *)iod->ipopts,
+                  iod->ipoptslen);
+  if (rc == -1) {
+    int err = socket_errno();
+
+    nsock_log_error("Setting of IP options failed (IOD #%li): %s (%d)",
+                    iod->id, socket_strerror(err), err);
+  }
+  return 0;
+}
+
+static int mksock_bind_device(struct npool *ms, struct niod *iod) {
+  int rc;
+
+  rc = socket_bindtodevice(iod->sd, ms->device);
+  if (!rc) {
+    int err = socket_errno();
+
+    if (err != EPERM)
+      nsock_log_error("Setting of SO_BINDTODEVICE failed (IOD #%li): %s (%d)",
+                      iod->id, socket_strerror(err), err);
+    else
+      nsock_log_debug_all("Setting of SO_BINDTODEVICE failed (IOD #%li): %s (%d)",
+                          iod->id, socket_strerror(err), err);
+  }
+  return 0;
+}
+
+static int mksock_set_broadcast(struct npool *ms, struct niod *iod) {
+  int rc;
+  int one = 1;
+
+  rc = setsockopt(iod->sd, SOL_SOCKET, SO_BROADCAST,
+                  (const char *)&one, sizeof(one));
+  if (rc == -1) {
+    int err = socket_errno();
+
+    nsock_log_error("Setting of SO_BROADCAST failed (IOD #%li): %s (%d)",
+                    iod->id, socket_strerror(err), err);
+  }
+  return 0;
+}
+/* Create the actual socket (nse->iod->sd) underlying the iod. This unblocks the
+ * socket, binds to the localaddr address, sets IP options, and sets the
+ * broadcast flag. Trying to change these functions after making this call will
+ * not have an effect. This function needs to be called before you try to read
+ * or write on the iod. */
+static int nsock_make_socket(struct npool *ms, struct niod *iod, int family, int type, int proto) {
+
+  /* inheritable_socket is from nbase */
+  iod->sd = (int)inheritable_socket(family, type, proto);
+  if (iod->sd == -1) {
+    nsock_log_error("Socket trouble: %s", socket_strerror(socket_errno()));
+    return -1;
+  }
+
+  unblock_socket(iod->sd);
+
+  iod->lastproto = proto;
+
+  if (iod->locallen)
+    mksock_bind_addr(ms, iod);
+
+  if (iod->ipoptslen && family == AF_INET)
+    mksock_set_ipopts(ms, iod);
+
+  if (ms->device)
+    mksock_bind_device(ms, iod);
+
+  if (ms->broadcast && type != SOCK_STREAM)
+    mksock_set_broadcast(ms, iod);
+
+  /* mksock_* functions can raise warnings/errors
+   * but we don't let them stop us for now. */
+  return iod->sd;
+}
+
+int nsock_setup_udp(nsock_pool nsp, nsock_iod ms_iod, int af) {
+  struct npool *ms = (struct npool *)nsp;
+  struct niod *nsi = (struct niod *)ms_iod;
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nsock_log_info("UDP unconnected socket (IOD #%li)", nsi->id);
+
+  if (nsock_make_socket(ms, nsi, af, SOCK_DGRAM, IPPROTO_UDP) == -1)
+    return -1;
+
+  return nsi->sd;
+}
+
+/* This does the actual logistics of requesting a connection.  It is shared
+ * by nsock_connect_tcp and nsock_connect_ssl, among others */
+void nsock_connect_internal(struct npool *ms, struct nevent *nse, int type, int proto, struct sockaddr_storage *ss, size_t sslen,
+                            unsigned int port) {
+
+  struct sockaddr_in *sin;
+#if HAVE_IPV6
+  struct sockaddr_in6 *sin6;
+#endif
+  struct niod *iod = nse->iod;
+
+  if (iod->px_ctx   /* proxy enabled */
+      && proto == IPPROTO_TCP   /* restrict proxying to TCP connections */
+      && (nse->handler != nsock_proxy_ev_dispatch)) {   /* for reentrancy */
+    struct proxy_node *current;
+
+    nsock_log_debug_all("TCP connection request (EID %lu) redirected through proxy chain",
+                        (long)nse->id);
+
+    current = iod->px_ctx->px_current;
+    assert(current != NULL);
+
+    memcpy(&iod->px_ctx->target_ss, ss, sslen);
+    iod->px_ctx->target_sslen = sslen;
+    iod->px_ctx->target_port  = port;
+
+    ss    = &current->ss;
+    sslen = current->sslen;
+    port  = current->port;
+
+    iod->px_ctx->target_handler = nse->handler;
+    nse->handler = nsock_proxy_ev_dispatch;
+
+    iod->px_ctx->target_ev_type = nse->type;
+    nse->type = NSE_TYPE_CONNECT;
+  }
+
+  sin = (struct sockaddr_in *)ss;
+#if HAVE_IPV6
+  sin6 = (struct sockaddr_in6 *)ss;
+#endif
+
+  /* Now it is time to actually attempt the connection */
+  if (nsock_make_socket(ms, iod, ss->ss_family, type, proto) == -1) {
+    nse->event_done = 1;
+    nse->status = NSE_STATUS_ERROR;
+    nse->errnum = socket_errno();
+  } else {
+    if (ss->ss_family == AF_INET) {
+      sin->sin_port = htons(port);
+    }
+#if HAVE_IPV6
+    else if (ss->ss_family == AF_INET6) {
+      sin6->sin6_port = htons(port);
+    }
+#endif
+#if HAVE_SYS_UN_H
+    else if (ss->ss_family == AF_UNIX) {
+      /* Nothing more to do for Unix socket */
+    }
+#endif
+#if HAVE_LINUX_VM_SOCKETS_H
+    else if (ss->ss_family == AF_VSOCK) {
+      struct sockaddr_vm *svm = (struct sockaddr_vm *)ss;
+
+      svm->svm_port = port;
+    }
+#endif
+    else {
+      fatal("Unknown address family %d\n", ss->ss_family);
+    }
+
+    assert(sslen <= sizeof(iod->peer));
+    if (&iod->peer != ss)
+      memcpy(&iod->peer, ss, sslen);
+    iod->peerlen = sslen;
+
+    if (ms->engine->io_operations->iod_connect(ms, iod->sd, (struct sockaddr *)ss, sslen) == -1) {
+      int err = socket_errno();
+
+      if ((proto == IPPROTO_UDP) || (err != EINPROGRESS && err != EAGAIN)) {
+        nse->event_done = 1;
+        nse->status = NSE_STATUS_ERROR;
+        nse->errnum = err;
+      }
+    }
+    /* The callback handle_connect_result handles the connection once it completes. */
+  }
+}
+
+#if HAVE_SYS_UN_H
+
+/* Request a UNIX domain sockets connection to the same system (by path to socket).
+ * This function connects to the socket of type SOCK_STREAM.  ss should be a
+ * sockaddr_storage, sockaddr_un as appropriate (just like what you would pass to
+ * connect).  sslen should be the sizeof the structure you are passing in. */
+nsock_event_id nsock_connect_unixsock_stream(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler, int timeout_msecs,
+                                             void *userdata, struct sockaddr *saddr, size_t sslen) {
+  struct niod *nsi = (struct niod *)nsiod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+  struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("UNIX domain socket (STREAM) connection requested to %s (IOD #%li) EID %li",
+                 get_unixsock_path(ss), nsi->id, nse->id);
+
+  nsock_connect_internal(ms, nse, SOCK_STREAM, 0, ss, sslen, 0);
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+
+}
+
+/* Request a UNIX domain sockets connection to the same system (by path to socket).
+ * This function connects to the socket of type SOCK_DGRAM.  ss should be a
+ * sockaddr_storage, sockaddr_un as appropriate (just like what you would pass to
+ * connect).  sslen should be the sizeof the structure you are passing in. */
+nsock_event_id nsock_connect_unixsock_datagram(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler,
+                                               void *userdata, struct sockaddr *saddr, size_t sslen) {
+  struct niod *nsi = (struct niod *)nsiod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+  struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT, nsi, -1, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("UNIX domain socket (DGRAM) connection requested to %s (IOD #%li) EID %li",
+                 get_unixsock_path(ss), nsi->id, nse->id);
+
+  nsock_connect_internal(ms, nse, SOCK_DGRAM, 0, ss, sslen, 0);
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
+#endif  /* HAVE_SYS_UN_H */
+
+#if HAVE_LINUX_VM_SOCKETS_H
+/* Request a vsock stream connection to another system.  ss should be a
+ * sockaddr_storage or sockaddr_vm, as appropriate (just like what you would
+ * pass to connect).  sslen should be the sizeof the structure you are passing
+ * in. */
+nsock_event_id nsock_connect_vsock_stream(nsock_pool nsp, nsock_iod ms_iod,
+                                          nsock_ev_handler handler,
+                                          int timeout_msecs, void *userdata,
+                                          struct sockaddr *saddr, size_t sslen,
+                                          unsigned int port) {
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+  struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+  struct sockaddr_vm *svm = (struct sockaddr_vm *)saddr;
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("vsock stream connection requested to %u:%u (IOD #%li) EID %li",
+                 svm->svm_cid, port, nsi->id, nse->id);
+
+  /* Do the actual connect() */
+  nsock_connect_internal(ms, nse, SOCK_STREAM, 0, ss, sslen, port);
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
+/* Request a vsock datagram "connection" to another system.  Since this is a
+ * datagram socket, no packets are actually sent.  The destination CID and port
+ * are just associated with the nsiod (an actual OS connect() call is made).
+ * You can then use the normal nsock write calls on the socket.  There is no
+ * timeout since this call always calls your callback at the next opportunity.
+ * The advantages to having a connected datagram socket (as opposed to just
+ * specifying an address with sendto() are that we can now use a consistent set
+ * of write/read calls for stream and datagram sockets, received packets from
+ * the non-partner are automatically dropped by the OS, and the OS can provide
+ * asynchronous errors (see Unix Network Programming pp224).  ss should be a
+ * sockaddr_storage or sockaddr_vm, as appropriate (just like what you would
+ * pass to connect).  sslen should be the sizeof the structure you are passing
+ * in. */
+nsock_event_id nsock_connect_vsock_datagram(nsock_pool nsp, nsock_iod nsiod,
+                                            nsock_ev_handler handler,
+                                            void *userdata,
+                                            struct sockaddr *saddr,
+                                            size_t sslen, unsigned int port) {
+  struct niod *nsi = (struct niod *)nsiod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+  struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+  struct sockaddr_vm *svm = (struct sockaddr_vm *)saddr;
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT, nsi, -1, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("vsock dgram connection requested to %u:%u (IOD #%li) EID %li",
+                 svm->svm_cid, port, nsi->id, nse->id);
+
+  nsock_connect_internal(ms, nse, SOCK_DGRAM, 0, ss, sslen, port);
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+#endif  /* HAVE_LINUX_VM_SOCKETS_H */
+
+/* Request a TCP connection to another system (by IP address).  The in_addr is
+ * normal network byte order, but the port number should be given in HOST BYTE
+ * ORDER.  ss should be a sockaddr_storage, sockaddr_in6, or sockaddr_in as
+ * appropriate (just like what you would pass to connect).  sslen should be the
+ * sizeof the structure you are passing in. */
+nsock_event_id nsock_connect_tcp(nsock_pool nsp, nsock_iod ms_iod, nsock_ev_handler handler, int timeout_msecs,
+                                 void *userdata, struct sockaddr *saddr, size_t sslen, unsigned short port) {
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+  struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("TCP connection requested to %s:%hu (IOD #%li) EID %li",
+                 inet_ntop_ez(ss, sslen), port, nsi->id, nse->id);
+
+  /* Do the actual connect() */
+  nsock_connect_internal(ms, nse, SOCK_STREAM, IPPROTO_TCP, ss, sslen, port);
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
+/* Request an SCTP association to another system (by IP address).  The in_addr
+ * is normal network byte order, but the port number should be given in HOST
+ * BYTE ORDER.  ss should be a sockaddr_storage, sockaddr_in6, or sockaddr_in as
+ * appropriate (just like what you would pass to connect).  sslen should be the
+ * sizeof the structure you are passing in. */
+nsock_event_id nsock_connect_sctp(nsock_pool nsp, nsock_iod ms_iod, nsock_ev_handler handler, int timeout_msecs,
+                                  void *userdata, struct sockaddr *saddr, size_t sslen, unsigned short port) {
+
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+  struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("SCTP association requested to %s:%hu (IOD #%li) EID %li",
+                 inet_ntop_ez(ss, sslen), port, nsi->id, nse->id);
+
+  /* Do the actual connect() */
+  nsock_connect_internal(ms, nse, SOCK_STREAM, IPPROTO_SCTP, ss, sslen, port);
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
+/* Request an SSL over TCP/SCTP/UDP connection to another system (by IP address).
+ * The in_addr is normal network byte order, but the port number should be given
+ * in HOST BYTE ORDER.  This function will call back only after it has made the
+ * connection AND done the initial SSL negotiation.  From that point on, you use
+ * the normal read/write calls and decryption will happen transparently. ss
+ * should be a sockaddr_storage, sockaddr_in6, or sockaddr_in as appropriate
+ * (just like what you would pass to connect).  sslen should be the sizeof the
+ * structure you are passing in. */
+nsock_event_id nsock_connect_ssl(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler, int timeout_msecs,
+                                 void *userdata, struct sockaddr *saddr, size_t sslen, int proto, unsigned short port, nsock_ssl_session ssl_session) {
+
+#ifndef HAVE_OPENSSL
+  fatal("nsock_connect_ssl called - but nsock was built w/o SSL support.  QUITTING");
+  return (nsock_event_id)0; /* UNREACHED */
+#else
+  struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+  struct niod *nsi = (struct niod *)nsiod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+
+  if (proto == IPPROTO_UDP)
+  {
+    if (!ms->dtlsctx)
+      nsock_pool_dtls_init(ms, 0);
+  }
+  else
+  {
+    if (!ms->sslctx)
+      nsock_pool_ssl_init(ms, 0);
+  }
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT_SSL, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  /* Set our SSL_SESSION so we can benefit from session-id reuse. */
+  /* but not with DTLS; save space in ClientHello message */
+  if (proto != IPPROTO_UDP)
+    nsi_set_ssl_session(nsi, (SSL_SESSION *)ssl_session);
+
+  if (proto == IPPROTO_UDP)
+    nsock_log_info("DTLS connection requested to %s:%hu/udp (IOD #%li) EID %li",
+
+                 inet_ntop_ez(ss, sslen), port, nsi->id, nse->id);
+  else
+    nsock_log_info("SSL connection requested to %s:%hu/%s (IOD #%li) EID %li",
+                 inet_ntop_ez(ss, sslen), port, (proto == IPPROTO_TCP ? "tcp" : "sctp"),
+                 nsi->id, nse->id);
+
+  /* Do the actual connect() */
+  nsock_connect_internal(ms, nse, (proto == IPPROTO_UDP ? SOCK_DGRAM : SOCK_STREAM), proto, ss, sslen, port);
+
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+#endif /* HAVE_OPENSSL */
+}
+
+/* Request ssl connection over already established connection.  nsiod must be
+ * socket that is already connected to target using nsock_connect_tcp or
+ * nsock_connect_sctp.  All parameters have the same meaning as in
+ * 'nsock_connect_ssl' */
+nsock_event_id nsock_reconnect_ssl(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler, int timeout_msecs,
+                                   void *userdata, nsock_ssl_session ssl_session) {
+
+#ifndef HAVE_OPENSSL
+  fatal("nsock_reconnect_ssl called - but nsock was built w/o SSL support.  QUITTING");
+  return (nsock_event_id) 0; /* UNREACHED */
+#else
+  struct niod *nsi = (struct niod *)nsiod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+  /* nsock_reconnect_ssl not supported for DTLS (yet?) */
+  assert(nsi->lastproto != IPPROTO_UDP);
+
+  if (!ms->sslctx)
+    nsock_pool_ssl_init(ms, 0);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT_SSL, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  /* Set our SSL_SESSION so we can benefit from session-id reuse. */
+  nsi_set_ssl_session(nsi, (SSL_SESSION *)ssl_session);
+
+  nsock_log_info("SSL reconnection requested (IOD #%li) EID %li",
+                 nsi->id, nse->id);
+
+  /* Do the actual connect() */
+  nse->event_done = 0;
+  nse->status = NSE_STATUS_SUCCESS;
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+#endif /* HAVE_OPENSSL */
+}
+
+/* Request a UDP "connection" to another system (by IP address).  The in_addr is
+ * normal network byte order, but the port number should be given in HOST BYTE
+ * ORDER.  Since this is UDP, no packets are actually sent.  The destination IP
+ * and port are just associated with the nsiod (an actual OS connect() call is
+ * made).  You can then use the normal nsock write calls on the socket.  There
+ * is no timeout since this call always calls your callback at the next
+ * opportunity.  The advantages to having a connected UDP socket (as opposed to
+ * just specifying an address with sendto() are that we can now use a consistent
+ * set of write/read calls for TCP/UDP, received packets from the non-partner
+ * are automatically dropped by the OS, and the OS can provide asynchronous
+ * errors (see Unix Network Programming pp224).  ss should be a
+ * sockaddr_storage, sockaddr_in6, or sockaddr_in as appropriate (just like what
+ * you would pass to connect).  sslen should be the sizeof the structure you are
+ * passing in. */
+nsock_event_id nsock_connect_udp(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler, void *userdata,
+                                 struct sockaddr *saddr, size_t sslen, unsigned short port) {
+
+  struct niod *nsi = (struct niod *)nsiod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+  struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+  assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+  nse = event_new(ms, NSE_TYPE_CONNECT, nsi, -1, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("UDP connection requested to %s:%hu (IOD #%li) EID %li",
+                 inet_ntop_ez(ss, sslen), port, nsi->id, nse->id);
+
+  nsock_connect_internal(ms, nse, SOCK_DGRAM, IPPROTO_UDP, ss, sslen, port);
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
+/* Returns that host/port/protocol information for the last communication (or
+ * comm. attempt) this nsi has been involved with.  By "involved" with I mean
+ * interactions like establishing (or trying to) a connection or sending a UDP
+ * datagram through an unconnected nsock_iod.  AF is the address family (AF_INET
+ * or AF_INET6), Protocl is IPPROTO_TCP or IPPROTO_UDP.  Pass NULL for
+ * information you do not need.  If ANY of the information you requested is not
+ * available, 0 will be returned and the unavailable sockets are zeroed.  If
+ * protocol or af is requested but not available, it will be set to -1 (and 0
+ * returned).  The pointers you pass in must be NULL or point to allocated
+ * address space.  The sockaddr members should actually be sockaddr_storage,
+ * sockaddr_in6, or sockaddr_in with the socklen of them set appropriately (eg
+ * sizeof(sockaddr_storage) if that is what you are passing). */
+int nsock_iod_get_communication_info(nsock_iod iod, int *protocol, int *af,
+                                     struct sockaddr *local,
+                                     struct sockaddr *remote, size_t socklen) {
+  struct niod *nsi = (struct niod *)iod;
+  int ret = 1;
+  struct sockaddr_storage ss;
+  socklen_t slen = sizeof(ss);
+  int res;
+
+  assert(socklen > 0);
+
+  if (nsi->peerlen > 0) {
+    if (remote)
+      memcpy(remote, &(nsi->peer), MIN((unsigned)socklen, nsi->peerlen));
+    if (protocol) {
+      *protocol = nsi->lastproto;
+      if (*protocol == -1) res = 0;
+    }
+    if (af) {
+      *af = nsi->peer.ss_family;
+    }
+    if (local) {
+      if (nsi->sd >= 0) {
+        res = getsockname(nsi->sd, (struct sockaddr *)&ss, &slen);
+        if (res == -1) {
+          memset(local, 0, socklen);
+          ret = 0;
+        } else {
+          assert(slen > 0);
+          memcpy(local, &ss, MIN((unsigned)slen, socklen));
+        }
+      } else {
+        memset(local, 0, socklen);
+        ret = 0;
+      }
+    }
+  } else {
+    if (local || remote || protocol || af)
+      ret = 0;
+
+    if (remote)
+      memset(remote, 0, socklen);
+
+    if (local)
+      memset(local, 0, socklen);
+
+    if (protocol)
+      *protocol = -1;
+
+    if (af)
+      *af = -1;
+  }
+  return ret;
+}
+
diff --git a/nsock/src/nsock_core.c b/nsock/src/nsock_core.c
new file mode 100644
index 0000000..fa2aef6
--- /dev/null
+++ b/nsock/src/nsock_core.c
@@ -0,0 +1,1415 @@
+/***************************************************************************
+ * nsock_core.c -- This contains the core engine routines for the nsock    *
+ * parallel socket event library.                                          *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock_internal.h"
+#include "gh_list.h"
+#include "filespace.h"
+#include "nsock_log.h"
+
+#include <assert.h>
+#if HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#if HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#if HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#if HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#if HAVE_STRING_H
+#include <string.h>
+#endif
+
+#include "netutils.h"
+
+#if HAVE_PCAP
+#include "nsock_pcap.h"
+#endif
+
+/* Nsock time of day -- we update this at least once per nsock_loop round (and
+ * after most calls that are likely to block).  Other nsock files should grab
+ * this */
+struct timeval nsock_tod;
+
+/* Internal function defined in nsock_event.c
+ * Update the nse->iod first events, assuming nse is about to be deleted */
+void update_first_events(struct nevent *nse);
+
+
+
+/* Each iod has a count of pending socket reads, socket writes, and pcap reads.
+ * When a descriptor's count is nonzero, its bit must be set in the appropriate
+ * master fd_set, and when the count is zero the bit must be cleared. What we
+ * are simulating is an fd_set with a counter for each socket instead of just an
+ * on/off switch. The fd_set's bits aren't enough by itself because a descriptor
+ * may for example have two reads pending at once, and the bit must not be
+ * cleared after the first is completed.
+ * The socket_count_* functions return the event to transmit to update_events()
+ */
+int socket_count_zero(struct niod *iod, struct npool *ms) {
+  iod->readsd_count = 0;
+  iod->writesd_count = 0;
+#if HAVE_PCAP
+  iod->readpcapsd_count = 0;
+#endif
+  return nsock_engine_iod_unregister(ms, iod);
+}
+
+static int socket_count_read_inc(struct niod *iod) {
+  assert(iod->readsd_count >= 0);
+  iod->readsd_count++;
+  return EV_READ;
+}
+
+static int socket_count_read_dec(struct niod *iod) {
+  assert(iod->readsd_count > 0);
+  iod->readsd_count--;
+  return (iod->readsd_count == 0) ? EV_READ : EV_NONE;
+}
+
+static int socket_count_write_inc(struct niod *iod) {
+  assert(iod->writesd_count >= 0);
+  iod->writesd_count++;
+  return EV_WRITE;
+}
+
+static int socket_count_write_dec(struct niod *iod) {
+  assert(iod->writesd_count > 0);
+  iod->writesd_count--;
+  return (iod->writesd_count == 0) ? EV_WRITE : EV_NONE;
+}
+
+#if HAVE_PCAP
+static int socket_count_readpcap_inc(struct niod *iod) {
+  assert(iod->readpcapsd_count >= 0);
+  iod->readpcapsd_count++;
+  return EV_READ;
+}
+
+static int socket_count_readpcap_dec(struct niod *iod) {
+  assert(iod->readpcapsd_count > 0);
+  iod->readpcapsd_count--;
+  return (iod->readpcapsd_count == 0) ? EV_READ : EV_NONE;
+}
+#endif
+
+#if HAVE_OPENSSL
+/* Call socket_count_read_dec or socket_count_write_dec on nse->iod depending on
+ * the current value of nse->sslinfo.ssl_desire. */
+static int socket_count_dec_ssl_desire(struct nevent *nse) {
+  assert(nse->iod->ssl != NULL);
+  assert(nse->sslinfo.ssl_desire == SSL_ERROR_WANT_READ ||
+         nse->sslinfo.ssl_desire == SSL_ERROR_WANT_WRITE);
+
+  if (nse->sslinfo.ssl_desire == SSL_ERROR_WANT_READ)
+    return socket_count_read_dec(nse->iod);
+  else
+    return socket_count_write_dec(nse->iod);
+}
+#endif
+
+static int should_clear_ev_read(const struct niod *iod, int ev_set) {
+  return (ev_set & EV_READ) &&
+#if HAVE_PCAP
+         !iod->readpcapsd_count &&
+#endif
+         !iod->readsd_count;
+}
+
+static int should_clear_ev_write(const struct niod *iod, int ev_set) {
+  return (ev_set & EV_WRITE) && !iod->writesd_count;
+}
+
+/* Update the events that the IO engine should watch for a given IOD.
+ *
+ * ev_inc is a set of events for which the event counters should be increased.
+ * These events will therefore be watched by the IO engine for this IOD.
+ *
+ * ev_dec is a set of events for which the event counters should be decreased.
+ * If this counter reaches zero, the event won't be watched anymore by the
+ * IO engine for this IOD.
+ */
+static void update_events(struct niod * iod, struct npool *ms, struct nevent *nse, int ev_inc, int ev_dec) {
+  int setmask, clrmask, ev_temp;
+
+  /* Filter out events that belong to both sets. */
+  ev_temp = ev_inc ^ ev_dec;
+  ev_inc = ev_inc & ev_temp;
+  ev_dec = ev_dec & ev_temp;
+
+  setmask = ev_inc;
+  clrmask = EV_NONE;
+
+  if (should_clear_ev_read(iod, ev_dec))
+    clrmask |= EV_READ;
+
+  if (should_clear_ev_write(iod, ev_dec))
+    clrmask |= EV_WRITE;
+
+  /* EV_EXCEPT is systematically set and cannot be removed */
+  if (ev_inc & EV_EXCEPT)
+    nsock_log_info("Invalid event set, no need to specify EV_EXCEPT");
+
+  if (ev_dec & EV_EXCEPT)
+    nsock_log_info("Invalid event set, refusing to clear EV_EXCEPT");
+
+  if (!IOD_PROPGET(iod, IOD_REGISTERED)) {
+    assert(clrmask == EV_NONE);
+    nsock_engine_iod_register(ms, iod, nse, setmask);
+  } else {
+    nsock_engine_iod_modify(ms, iod, nse, setmask, clrmask);
+  }
+}
+
+/* Add a new event for a given IOD. nevents are stored in separate event lists
+ * (in the nsock pool) and are grouped by IOD within each list.
+ *
+ * This function appends the event _before_ the first similar event we have for
+ * the given IOD, or append it to the end of the list if no similar event is
+ * already present.
+ *
+ * Note that adding the event before the similar ones is important for
+ * reentrancy, as it will prevent the new event to be processed in the event
+ * loop just after its addition.
+ */
+static int iod_add_event(struct niod *iod, struct nevent *nse) {
+  struct npool *nsp = iod->nsp;
+
+  switch (nse->type) {
+    case NSE_TYPE_CONNECT:
+    case NSE_TYPE_CONNECT_SSL:
+      if (iod->first_connect)
+        gh_list_insert_before(&nsp->connect_events,
+                              iod->first_connect, &nse->nodeq_io);
+      else
+        gh_list_append(&nsp->connect_events, &nse->nodeq_io);
+      iod->first_connect = &nse->nodeq_io;
+      break;
+
+    case NSE_TYPE_READ:
+      if (iod->first_read)
+        gh_list_insert_before(&nsp->read_events, iod->first_read, &nse->nodeq_io);
+      else
+        gh_list_append(&nsp->read_events, &nse->nodeq_io);
+      iod->first_read = &nse->nodeq_io;
+      break;
+
+    case NSE_TYPE_WRITE:
+      if (iod->first_write)
+        gh_list_insert_before(&nsp->write_events, iod->first_write, &nse->nodeq_io);
+      else
+        gh_list_append(&nsp->write_events, &nse->nodeq_io);
+      iod->first_write = &nse->nodeq_io;
+      break;
+
+#if HAVE_PCAP
+    case NSE_TYPE_PCAP_READ: {
+      char add_read = 0, add_pcap_read = 0;
+
+#if PCAP_BSD_SELECT_HACK
+      /* BSD hack mode: add event to both read and pcap_read lists */
+      add_read = add_pcap_read = 1;
+#else
+      if (((mspcap *)iod->pcap)->pcap_desc >= 0) {
+        add_read = 1;
+      } else {
+        add_pcap_read = 1;
+      }
+#endif
+      if (add_read) {
+        if (iod->first_read)
+          gh_list_insert_before(&nsp->read_events, iod->first_read, &nse->nodeq_io);
+        else
+          gh_list_append(&nsp->read_events, &nse->nodeq_io);
+        iod->first_read = &nse->nodeq_io;
+      }
+      if (add_pcap_read) {
+        if (iod->first_pcap_read)
+          gh_list_insert_before(&nsp->pcap_read_events, iod->first_pcap_read,
+                                &nse->nodeq_pcap);
+        else
+          gh_list_append(&nsp->pcap_read_events, &nse->nodeq_pcap);
+        iod->first_pcap_read = &nse->nodeq_pcap;
+      }
+      break;
+    }
+#endif
+
+    default:
+      fatal("Unknown event type (%d) for IOD #%lu\n", nse->type, iod->id);
+  }
+
+  return 0;
+}
+
+/* A handler function is defined for each of the main event types (read, write,
+ * connect, timer, etc) -- the handler is called when new information is
+ * available for the event.  The handler makes any necessary updates to the
+ * event based on any new information available.  If the event becomes ready for
+ * delivery, the handler sets nse->event_done and fills out the relevant event
+ * fields (status, errnum) as applicable.  The handlers also take care of event
+ * type specific teardown (such as clearing socket descriptors from select/poll
+ * lists).  If event_done is not set, the handler will be called again in the
+ * case of more information or an event timeout */
+
+/* The event type handlers -- the first three arguments of each are the same:
+ * struct npool *ms struct nevent *nse -- the event we have new info on enum nse_status --
+ * The reason for the call, usually NSE_STATUS_SUCCESS (which generally means a
+ * successful I/O call or NSE_STATUS_TIMEOUT or NSE_STATUS_CANCELLED
+ *
+ *  Some of the event type handlers have other parameters, specific to their
+ *  needs.  All the handlers can assume that the calling function has checked
+ *  that select or poll said their descriptors were readable/writeable (as
+ *  appropriate).
+ *
+ *  The idea is that each handler will take care of the stuff that is specific
+ *  to it and the calling function will handle the stuff that can be generalized
+ *  to dispatching/deleting/etc. all events.  But the calling function may use
+ *  type-specific info to determine whether the handler should be called at all
+ *  (to save CPU time). */
+
+/* handle_connect_results assumes that select or poll have already shown the
+ * descriptor to be active */
+void handle_connect_result(struct npool *ms, struct nevent *nse, enum nse_status status) {
+  int optval;
+  socklen_t optlen = sizeof(int);
+  struct niod *iod = nse->iod;
+  assert(iod != NULL);
+#if HAVE_OPENSSL
+  int sslerr;
+  int rc = 0;
+  int sslconnect_inprogress = nse->type == NSE_TYPE_CONNECT_SSL && nse->iod &&
+    (nse->sslinfo.ssl_desire == SSL_ERROR_WANT_READ ||
+     nse->sslinfo.ssl_desire == SSL_ERROR_WANT_WRITE);
+  SSL_CTX *sslctx = NULL;
+#else
+  int sslconnect_inprogress = 0;
+#endif
+
+  if (status == NSE_STATUS_TIMEOUT || status == NSE_STATUS_CANCELLED) {
+    nse->status = status;
+    nse->event_done = 1;
+  } else if (sslconnect_inprogress) {
+    /* Do nothing */
+  } else if (status == NSE_STATUS_SUCCESS) {
+    /* First we want to determine whether the socket really is connected */
+    if (getsockopt(iod->sd, SOL_SOCKET, SO_ERROR, (char *)&optval, &optlen) != 0)
+      optval = socket_errno(); /* Stupid Solaris */
+
+    if (optval == 0) {
+        nse->status = NSE_STATUS_SUCCESS;
+    }
+    else {
+        nse->status = NSE_STATUS_ERROR;
+        nse->errnum = optval;
+    }
+
+    /* Now special code for the SSL case where the TCP connection was successful. */
+    if (nse->type == NSE_TYPE_CONNECT_SSL &&
+        nse->status == NSE_STATUS_SUCCESS) {
+#if HAVE_OPENSSL
+      sslctx = iod->lastproto == IPPROTO_UDP ? ms->dtlsctx : ms->sslctx;
+      assert(sslctx != NULL);
+      /* Reuse iod->ssl if present. If set, this is the second try at connection
+         without the SSL_OP_NO_SSLv2 option set. */
+      if (iod->ssl == NULL) {
+        iod->ssl = SSL_new(sslctx);
+        if (!iod->ssl)
+          fatal("SSL_new failed: %s", ERR_error_string(ERR_get_error(), NULL));
+      }
+
+#if HAVE_SSL_SET_TLSEXT_HOST_NAME
+      /* Avoid sending SNI extension with DTLS because many servers don't allow
+       * fragmented ClientHello messages. */
+      if (iod->hostname != NULL && iod->lastproto != IPPROTO_UDP) {
+        if (SSL_set_tlsext_host_name(iod->ssl, iod->hostname) != 1)
+          fatal("SSL_set_tlsext_host_name failed: %s", ERR_error_string(ERR_get_error(), NULL));
+      }
+#endif
+
+      /* Associate our new SSL with the connected socket.  It will inherit the
+       * non-blocking nature of the sd */
+      if (SSL_set_fd(iod->ssl, iod->sd) != 1)
+        fatal("SSL_set_fd failed: %s", ERR_error_string(ERR_get_error(), NULL));
+
+      /* Event not done -- need to do SSL connect below */
+      nse->sslinfo.ssl_desire = SSL_ERROR_WANT_CONNECT;
+#endif
+    } else {
+      /* This is not an SSL connect (in which case we are always done), or the
+       * TCP connect() underlying the SSL failed (in which case we are also done */
+      nse->event_done = 1;
+    }
+  } else {
+    fatal("Unknown status (%d)", status);
+  }
+
+  /* At this point the TCP connection is done, whether successful or not.
+   * Therefore decrease the read/write listen counts that were incremented in
+   * nsock_pool_add_event. In the SSL case, we may increase one of the counts depending
+   * on whether SSL_connect returns an error of SSL_ERROR_WANT_READ or
+   * SSL_ERROR_WANT_WRITE. In that case we will re-enter this function, but we
+   * don't want to execute this block again. */
+  if (iod->sd != -1 && !sslconnect_inprogress) {
+    int ev = EV_NONE;
+
+    ev |= socket_count_read_dec(iod);
+    ev |= socket_count_write_dec(iod);
+    update_events(iod, ms, nse, EV_NONE, ev);
+  }
+
+#if HAVE_OPENSSL
+  if (nse->type == NSE_TYPE_CONNECT_SSL && !nse->event_done) {
+    /* Lets now start/continue/finish the connect! */
+    if (iod->ssl_session) {
+      rc = SSL_set_session(iod->ssl, iod->ssl_session);
+      if (rc == 0)
+        nsock_log_error("Uh-oh: SSL_set_session() failed - please tell dev@nmap.org");
+      iod->ssl_session = NULL; /* No need for this any more */
+    }
+
+    /* If this is a reinvocation of handle_connect_result, clear out the listen
+     * bits that caused it, based on the previous SSL desire. */
+    if (sslconnect_inprogress) {
+      int ev;
+
+      ev = socket_count_dec_ssl_desire(nse);
+      update_events(iod, ms, nse, EV_NONE, ev);
+    }
+
+    rc = SSL_connect(iod->ssl);
+    if (rc == 1) {
+      /* Woop!  Connect is done! */
+      nse->event_done = 1;
+      /* Check that certificate verification was okay, if requested. */
+      if (nsi_ssl_post_connect_verify(iod)) {
+        nse->status = NSE_STATUS_SUCCESS;
+      } else {
+        nsock_log_error("certificate verification error for EID %li: %s",
+                        nse->id, ERR_error_string(ERR_get_error(), NULL));
+        nse->status = NSE_STATUS_ERROR;
+      }
+    } else {
+#if SSL_OP_NO_SSLv2 != 0
+      long options = SSL_get_options(iod->ssl);
+#endif
+
+      sslerr = SSL_get_error(iod->ssl, rc);
+      if (sslerr == SSL_ERROR_WANT_READ) {
+        nse->sslinfo.ssl_desire = sslerr;
+        socket_count_read_inc(iod);
+        update_events(iod, ms, nse, EV_READ, EV_NONE);
+      } else if (sslerr == SSL_ERROR_WANT_WRITE) {
+        nse->sslinfo.ssl_desire = sslerr;
+        socket_count_write_inc(iod);
+        update_events(iod, ms, nse, EV_WRITE, EV_NONE);
+#if SSL_OP_NO_SSLv2 != 0
+      } else if (iod->lastproto != IPPROTO_UDP && !(options & SSL_OP_NO_SSLv2)) {
+        /* SSLv2 does not apply to DTLS, so ensure lastproto was not UDP. */
+        int saved_ev;
+
+        /* SSLv3-only and TLSv1-only servers can't be connected to when the
+         * SSL_OP_NO_SSLv2 option is not set, which is the case when the pool
+         * was initialized with nsock_pool_ssl_init_max_speed. Try reconnecting
+         * with SSL_OP_NO_SSLv2. Never downgrade a NO_SSLv2 connection to one
+         * that might use SSLv2. */
+        nsock_log_info("EID %li reconnecting with SSL_OP_NO_SSLv2", nse->id);
+
+        saved_ev = iod->watched_events;
+        nsock_engine_iod_unregister(ms, iod);
+        close(iod->sd);
+        nsock_connect_internal(ms, nse, SOCK_STREAM, iod->lastproto, &iod->peer,
+                               iod->peerlen, nsock_iod_get_peerport(iod));
+        nsock_engine_iod_register(ms, iod, nse, saved_ev);
+
+        /* Use SSL_free here because SSL_clear keeps session info, which
+         * doesn't work when changing SSL versions (as we're clearly trying to
+         * do by adding SSL_OP_NO_SSLv2). */
+        SSL_free(iod->ssl);
+        iod->ssl = SSL_new(ms->sslctx);
+        if (!iod->ssl)
+          fatal("SSL_new failed: %s", ERR_error_string(ERR_get_error(), NULL));
+
+        SSL_set_options(iod->ssl, options | SSL_OP_NO_SSLv2);
+        socket_count_read_inc(nse->iod);
+        socket_count_write_inc(nse->iod);
+        update_events(iod, ms, nse, EV_READ|EV_WRITE, EV_NONE);
+        nse->sslinfo.ssl_desire = SSL_ERROR_WANT_CONNECT;
+#endif
+      } else {
+        nsock_log_info("EID %li %s",
+                       nse->id, ERR_error_string(ERR_get_error(), NULL));
+        nse->event_done = 1;
+        nse->status = NSE_STATUS_ERROR;
+        nse->errnum = EIO;
+      }
+    }
+  }
+#endif
+}
+
+static int errcode_is_failure(int err) {
+#ifndef WIN32
+  return err != EINTR && err != EAGAIN && err != EBUSY;
+#else
+  return err != EINTR && err != EAGAIN;
+#endif
+}
+
+void handle_write_result(struct npool *ms, struct nevent *nse, enum nse_status status) {
+  int bytesleft;
+  char *str;
+  int res;
+  int err;
+  struct niod *iod = nse->iod;
+
+  if (status == NSE_STATUS_TIMEOUT || status == NSE_STATUS_CANCELLED) {
+    nse->event_done = 1;
+    nse->status = status;
+  } else if (status == NSE_STATUS_SUCCESS) {
+    str = fs_str(&nse->iobuf) + nse->writeinfo.written_so_far;
+    bytesleft = fs_length(&nse->iobuf) - nse->writeinfo.written_so_far;
+    if (nse->writeinfo.written_so_far > 0)
+      assert(bytesleft > 0);
+#if HAVE_OPENSSL
+    if (iod->ssl)
+      res = SSL_write(iod->ssl, str, bytesleft);
+    else
+#endif
+      res = ms->engine->io_operations->iod_write(ms, nse->iod->sd, str, bytesleft, 0, (struct sockaddr *)&nse->writeinfo.dest, (int)nse->writeinfo.destlen);
+    if (res == bytesleft) {
+      nse->event_done = 1;
+      nse->status = NSE_STATUS_SUCCESS;
+    } else if (res >= 0) {
+      nse->writeinfo.written_so_far += res;
+    } else {
+      assert(res == -1);
+      if (iod->ssl) {
+#if HAVE_OPENSSL
+        err = SSL_get_error(iod->ssl, res);
+        if (err == SSL_ERROR_WANT_READ) {
+          int evclr;
+
+          evclr = socket_count_dec_ssl_desire(nse);
+          socket_count_read_inc(iod);
+          update_events(iod, ms, nse, EV_READ, evclr);
+          nse->sslinfo.ssl_desire = err;
+        } else if (err == SSL_ERROR_WANT_WRITE) {
+          int evclr;
+
+          evclr = socket_count_dec_ssl_desire(nse);
+          socket_count_write_inc(iod);
+          update_events(iod, ms, nse, EV_WRITE, evclr);
+          nse->sslinfo.ssl_desire = err;
+        } else {
+          /* Unexpected error */
+          nse->event_done = 1;
+          nse->status = NSE_STATUS_ERROR;
+          nse->errnum = EIO;
+        }
+#endif
+      } else {
+        err = socket_errno();
+        if (errcode_is_failure(err)) {
+          nse->event_done = 1;
+          nse->status = NSE_STATUS_ERROR;
+          nse->errnum = err;
+        }
+      }
+    }
+
+    if (res >= 0)
+      nse->iod->write_count += res;
+  }
+
+  if (nse->event_done && nse->iod->sd != -1) {
+    int ev = EV_NONE;
+
+#if HAVE_OPENSSL
+    if (nse->iod->ssl != NULL)
+      ev |= socket_count_dec_ssl_desire(nse);
+    else
+#endif
+      ev |= socket_count_write_dec(nse->iod);
+    update_events(nse->iod, ms, nse, EV_NONE, ev);
+  }
+}
+
+void handle_timer_result(struct npool *ms, struct nevent *nse, enum nse_status status) {
+  /* Ooh this is a hard job :) */
+  nse->event_done = 1;
+  nse->status = status;
+}
+
+/* Returns -1 if an error, otherwise the number of newly written bytes */
+static int do_actual_read(struct npool *ms, struct nevent *nse) {
+  char buf[READ_BUFFER_SZ];
+  int buflen = 0;
+  struct niod *iod = nse->iod;
+  int err = 0;
+  int max_chunk = NSOCK_READ_CHUNK_SIZE;
+  int startlen = fs_length(&nse->iobuf);
+  int enotsock = 0;  /* Did we get ENOTSOCK once? */
+
+  if (nse->readinfo.read_type == NSOCK_READBYTES)
+    max_chunk = nse->readinfo.num;
+
+  if (!iod->ssl) {
+    do {
+      struct sockaddr_storage peer;
+      socklen_t peerlen;
+      peerlen = sizeof(peer);
+
+      if (enotsock) {
+        peer.ss_family = AF_UNSPEC;
+        peerlen = 0;
+        buflen = read(iod->sd, buf, sizeof(buf));
+      }
+      else {
+        buflen = ms->engine->io_operations->iod_read(ms, iod->sd, buf, sizeof(buf), 0, (struct sockaddr *)&peer, &peerlen);
+
+        /* Using recv() was failing, at least on UNIX, for non-network sockets
+         * (i.e. stdin) in this case, a read() is done - as on ENOTSOCK we may
+         * have a non-network socket */
+        if (buflen == -1) {
+          if (socket_errno() == ENOTSOCK) {
+            enotsock = 1;
+            peer.ss_family = AF_UNSPEC;
+            peerlen = 0;
+            buflen = read(iod->sd, buf, sizeof(buf));
+          }
+        }
+      }
+      if (buflen == -1) {
+        err = socket_errno();
+      }
+      else {
+        /* Windows will ignore src_addr and addrlen arguments to recvfrom on TCP
+         * sockets, so peerlen is still sizeof(peer) and peer is junk. Instead,
+         * only set this if it's not already set.
+         */
+        if (peerlen > 0 && iod->peerlen == 0) {
+          assert(peerlen <= sizeof(iod->peer));
+          memcpy(&iod->peer, &peer, peerlen);
+          iod->peerlen = peerlen;
+        }
+        if (buflen > 0) {
+          if (fs_cat(&nse->iobuf, buf, buflen) == -1) {
+            nse->event_done = 1;
+            nse->status = NSE_STATUS_ERROR;
+            nse->errnum = ENOMEM;
+            return -1;
+          }
+
+          /* Sometimes a service just spews and spews data.  So we return after a
+           * somewhat large amount to avoid monopolizing resources and avoid DOS
+           * attacks. */
+          if (fs_length(&nse->iobuf) > max_chunk)
+            return fs_length(&nse->iobuf) - startlen;
+
+          /* No good reason to read again if we we were successful in the read but
+           * didn't fill up the buffer.  Especially for UDP, where we want to
+           * return only one datagram at a time. The consistency of the above
+           * assignment of iod->peer depends on not consolidating more than one
+           * UDP read buffer. */
+          if (buflen < sizeof(buf))
+            return fs_length(&nse->iobuf) - startlen;
+        }
+      }
+    } while (buflen > 0 || (buflen == -1 && err == EINTR));
+
+    if (buflen == -1) {
+      if (err != EINTR && err != EAGAIN) {
+        nse->event_done = 1;
+        nse->status = NSE_STATUS_ERROR;
+        nse->errnum = err;
+        return -1;
+      }
+    }
+  } else {
+#if HAVE_OPENSSL
+    /* OpenSSL read */
+    while ((buflen = SSL_read(iod->ssl, buf, sizeof(buf))) > 0) {
+
+      if (fs_cat(&nse->iobuf, buf, buflen) == -1) {
+        nse->event_done = 1;
+        nse->status = NSE_STATUS_ERROR;
+        nse->errnum = ENOMEM;
+        return -1;
+      }
+
+      /* Sometimes a service just spews and spews data.  So we return
+       * after a somewhat large amount to avoid monopolizing resources
+       * and avoid DOS attacks. */
+      if (fs_length(&nse->iobuf) > max_chunk)
+        return fs_length(&nse->iobuf) - startlen;
+    }
+
+    if (buflen == -1) {
+      err = SSL_get_error(iod->ssl, buflen);
+      if (err == SSL_ERROR_WANT_READ) {
+        int evclr;
+
+        evclr = socket_count_dec_ssl_desire(nse);
+        socket_count_read_inc(iod);
+        update_events(iod, ms, nse, EV_READ, evclr);
+        nse->sslinfo.ssl_desire = err;
+      } else if (err == SSL_ERROR_WANT_WRITE) {
+        int evclr;
+
+        evclr = socket_count_dec_ssl_desire(nse);
+        socket_count_write_inc(iod);
+        update_events(iod, ms, nse, EV_WRITE, evclr);
+        nse->sslinfo.ssl_desire = err;
+      } else {
+        /* Unexpected error */
+        nse->event_done = 1;
+        nse->status = NSE_STATUS_ERROR;
+        nse->errnum = EIO;
+        nsock_log_info("SSL_read() failed for reason %s on NSI %li",
+                       ERR_error_string(err, NULL), iod->id);
+        return -1;
+      }
+    }
+#endif /* HAVE_OPENSSL */
+  }
+
+  if (buflen == 0) {
+    nse->event_done = 1;
+    nse->eof = 1;
+    if (fs_length(&nse->iobuf) > 0) {
+      nse->status = NSE_STATUS_SUCCESS;
+      return fs_length(&nse->iobuf) - startlen;
+    } else {
+      nse->status = NSE_STATUS_EOF;
+      return 0;
+    }
+  }
+
+  return fs_length(&nse->iobuf) - startlen;
+}
+
+
+void handle_read_result(struct npool *ms, struct nevent *nse, enum nse_status status) {
+  unsigned int count;
+  char *str;
+  int rc, len;
+  struct niod *iod = nse->iod;
+
+  if (status == NSE_STATUS_TIMEOUT) {
+    nse->event_done = 1;
+    if (fs_length(&nse->iobuf) > 0)
+      nse->status = NSE_STATUS_SUCCESS;
+    else
+      nse->status = NSE_STATUS_TIMEOUT;
+  } else if (status == NSE_STATUS_CANCELLED) {
+    nse->status = status;
+    nse->event_done = 1;
+  } else if (status == NSE_STATUS_SUCCESS) {
+    rc = do_actual_read(ms, nse);
+    /* printf("DBG: Just read %d new bytes%s.\n", rc, iod->ssl? "( SSL!)" : ""); */
+    if (rc > 0) {
+      nse->iod->read_count += rc;
+      /* We decide whether we have read enough to return */
+      switch (nse->readinfo.read_type) {
+        case NSOCK_READ:
+          nse->status = NSE_STATUS_SUCCESS;
+          nse->event_done = 1;
+          break;
+        case NSOCK_READBYTES:
+          if (fs_length(&nse->iobuf) >= nse->readinfo.num) {
+            nse->status = NSE_STATUS_SUCCESS;
+            nse->event_done = 1;
+          }
+          /* else we are not done */
+          break;
+        case NSOCK_READLINES:
+          /* Lets count the number of lines we have ... */
+          count = 0;
+          len = fs_length(&nse->iobuf) -1;
+          str = fs_str(&nse->iobuf);
+          for (count=0; len >= 0; len--) {
+            if (str[len] == '\n') {
+              count++;
+              if ((int)count >= nse->readinfo.num)
+                break;
+            }
+          }
+          if ((int) count >= nse->readinfo.num) {
+            nse->event_done = 1;
+            nse->status = NSE_STATUS_SUCCESS;
+          }
+          /* Else we are not done */
+          break;
+        default:
+          fatal("Unknown operation type (%d)", (int)nse->readinfo.read_type);
+      }
+    }
+  } else {
+    fatal("Unknown status (%d)", status);
+  }
+
+  /* If there are no more reads for this IOD, we are done reading on the socket
+   * so we can take it off the descriptor list ... */
+  if (nse->event_done && iod->sd >= 0) {
+    int ev = EV_NONE;
+
+#if HAVE_OPENSSL
+    if (nse->iod->ssl != NULL)
+      ev |= socket_count_dec_ssl_desire(nse);
+    else
+#endif
+      ev |= socket_count_read_dec(nse->iod);
+    update_events(nse->iod, ms, nse, EV_NONE, ev);
+  }
+}
+
+#if HAVE_PCAP
+void handle_pcap_read_result(struct npool *ms, struct nevent *nse, enum nse_status status) {
+  struct niod *iod = nse->iod;
+  mspcap *mp = (mspcap *)iod->pcap;
+
+  switch (status) {
+    case NSE_STATUS_TIMEOUT:
+      nse->status = NSE_STATUS_TIMEOUT;
+      nse->event_done = 1;
+      break;
+
+    case NSE_STATUS_CANCELLED:
+      nse->status = NSE_STATUS_CANCELLED;
+      nse->event_done = 1;
+      break;
+
+    case NSE_STATUS_SUCCESS:
+      /* check if we already have something read */
+      if (fs_length(&(nse->iobuf)) == 0) {
+        nse->status = NSE_STATUS_TIMEOUT;
+        nse->event_done = 0;
+      } else {
+        nse->status = NSE_STATUS_SUCCESS; /* we have full buffer */
+        nse->event_done = 1;
+      }
+      break;
+
+    default:
+      fatal("Unknown status (%d) for nsock event #%lu", status, nse->id);
+  }
+
+  /* If there are no more read events, we are done reading on the socket so we
+   * can take it off the descriptor list... */
+  if (nse->event_done && mp->pcap_desc >= 0) {
+    int ev;
+
+    ev = socket_count_readpcap_dec(iod);
+    update_events(iod, ms, nse, EV_NONE, ev);
+  }
+}
+
+/* Returns whether something was read */
+int pcap_read_on_nonselect(struct npool *nsp) {
+  gh_lnode_t *current, *next;
+  struct nevent *nse;
+  int ret = 0;
+
+  for (current = gh_list_first_elem(&nsp->pcap_read_events);
+       current != NULL;
+       current = next) {
+    nse = lnode_nevent2(current);
+    if (do_actual_pcap_read(nse) == 1) {
+      /* something received */
+      ret++;
+      break;
+    }
+    next = gh_lnode_next(current);
+  }
+  return ret;
+}
+#endif /* HAVE_PCAP */
+
+/* Here is the all important looping function that tells the event engine to
+ * start up and begin processing events.  It will continue until all events have
+ * been delivered (including new ones started from event handlers), or the
+ * msec_timeout is reached, or a major error has occurred.  Use -1 if you don't
+ * want to set a maximum time for it to run.  A timeout of 0 will return after 1
+ * non-blocking loop.  The nsock loop can be restarted again after it returns.
+ * For example you could do a series of 15 second runs, allowing you to do other
+ * stuff between them */
+enum nsock_loopstatus nsock_loop(nsock_pool nsp, int msec_timeout) {
+  struct npool *ms = (struct npool *)nsp;
+  struct timeval loop_timeout;
+  int msecs_left;
+  unsigned long loopnum = 0;
+  enum nsock_loopstatus quitstatus = NSOCK_LOOP_ERROR;
+
+  gettimeofday(&nsock_tod, NULL);
+
+  if (msec_timeout < -1) {
+    ms->errnum = EINVAL;
+    return NSOCK_LOOP_ERROR;
+  }
+  TIMEVAL_MSEC_ADD(loop_timeout, nsock_tod, msec_timeout);
+  msecs_left = msec_timeout;
+
+  if (msec_timeout >= 0)
+    nsock_log_debug("nsock_loop() started (timeout=%dms). %d events pending",
+                    msec_timeout, ms->events_pending);
+  else
+    nsock_log_debug("nsock_loop() started (no timeout). %d events pending",
+                    ms->events_pending);
+
+  while (1) {
+    if (ms->quit) {
+      /* We've been asked to quit the loop through nsock_loop_quit. */
+      ms->quit = 0;
+      quitstatus = NSOCK_LOOP_QUIT;
+      break;
+    }
+
+    if (ms->events_pending == 0) {
+      /* if no events at all are pending, then none can be created until
+       * we quit nsock_loop() -- so we do that now. */
+      quitstatus = NSOCK_LOOP_NOEVENTS;
+      break;
+    }
+
+    if (msec_timeout >= 0) {
+      msecs_left = MAX(0, TIMEVAL_MSEC_SUBTRACT(loop_timeout, nsock_tod));
+      if (msecs_left == 0 && loopnum > 0) {
+        quitstatus = NSOCK_LOOP_TIMEOUT;
+        break;
+      }
+    }
+
+    if (nsock_engine_loop(ms, msecs_left) == -1) {
+      quitstatus = NSOCK_LOOP_ERROR;
+      break;
+    }
+
+    gettimeofday(&nsock_tod, NULL); /* we do this at end because there is one
+                                     * at beginning of function */
+    loopnum++;
+  }
+
+  return quitstatus;
+}
+
+void process_event(struct npool *nsp, gh_list_t *evlist, struct nevent *nse, int ev) {
+  int match_r = ev & EV_READ;
+  int match_w = ev & EV_WRITE;
+  int match_x = ev & EV_EXCEPT;
+#if HAVE_OPENSSL
+  int desire_r = 0, desire_w = 0;
+#endif
+
+  nsock_log_debug_all("Processing event %lu (timeout in %ldms, done=%d)",
+                      nse->id,
+                      (long)TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod),
+                      nse->event_done);
+
+  if (!nse->event_done) {
+    switch (nse->type) {
+      case NSE_TYPE_CONNECT:
+      case NSE_TYPE_CONNECT_SSL:
+        if (ev != EV_NONE)
+          handle_connect_result(nsp, nse, NSE_STATUS_SUCCESS);
+        if (event_timedout(nse))
+          handle_connect_result(nsp, nse, NSE_STATUS_TIMEOUT);
+        break;
+
+      case NSE_TYPE_READ:
+#if HAVE_OPENSSL
+        desire_r = nse->sslinfo.ssl_desire == SSL_ERROR_WANT_READ;
+        desire_w = nse->sslinfo.ssl_desire == SSL_ERROR_WANT_WRITE;
+        if (nse->iod->ssl && ((desire_r && match_r) || (desire_w && match_w)))
+          handle_read_result(nsp, nse, NSE_STATUS_SUCCESS);
+        else
+#endif
+        if ((!nse->iod->ssl && match_r) || match_x)
+          handle_read_result(nsp, nse, NSE_STATUS_SUCCESS);
+
+        if (event_timedout(nse))
+          handle_read_result(nsp, nse, NSE_STATUS_TIMEOUT);
+
+        break;
+
+      case NSE_TYPE_WRITE:
+#if HAVE_OPENSSL
+        desire_r = nse->sslinfo.ssl_desire == SSL_ERROR_WANT_READ;
+        desire_w = nse->sslinfo.ssl_desire == SSL_ERROR_WANT_WRITE;
+        if (nse->iod->ssl && ((desire_r && match_r) || (desire_w && match_w)))
+          handle_write_result(nsp, nse, NSE_STATUS_SUCCESS);
+        else
+#endif
+          if ((!nse->iod->ssl && match_w) || match_x)
+            handle_write_result(nsp, nse, NSE_STATUS_SUCCESS);
+
+        if (event_timedout(nse))
+          handle_write_result(nsp, nse, NSE_STATUS_TIMEOUT);
+        break;
+
+      case NSE_TYPE_TIMER:
+        if (event_timedout(nse))
+          handle_timer_result(nsp, nse, NSE_STATUS_SUCCESS);
+        break;
+
+#if HAVE_PCAP
+      case NSE_TYPE_PCAP_READ:{
+        nsock_log_debug_all("PCAP iterating %lu", nse->id);
+
+        if (ev & EV_READ) {
+          /* buffer empty? check it! */
+          if (fs_length(&(nse->iobuf)) == 0)
+            do_actual_pcap_read(nse);
+        }
+
+        /* if already received something */
+        if (fs_length(&(nse->iobuf)) > 0)
+          handle_pcap_read_result(nsp, nse, NSE_STATUS_SUCCESS);
+
+        if (event_timedout(nse))
+          handle_pcap_read_result(nsp, nse, NSE_STATUS_TIMEOUT);
+
+        #if PCAP_BSD_SELECT_HACK
+        /* If event occurred, and we're in BSD_HACK mode, then this event was added
+         * to two queues. read_event and pcap_read_event
+         * Of course we should destroy it only once.
+         * I assume we're now in read_event, so just unlink this event from
+         * pcap_read_event */
+        if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0
+            && nse->event_done
+            && evlist == &nsp->read_events) {
+          /* event is done, list is read_events and we're in BSD_HACK mode.
+           * So unlink event from pcap_read_events */
+          update_first_events(nse);
+          gh_list_remove(&nsp->pcap_read_events, &nse->nodeq_pcap);
+
+          nsock_log_debug_all("PCAP NSE #%lu: Removing event from PCAP_READ_EVENTS",
+                              nse->id);
+        }
+        if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0
+            && nse->event_done
+            && evlist == &nsp->pcap_read_events) {
+          update_first_events(nse);
+          gh_list_remove(&nsp->read_events, &nse->nodeq_io);
+          nsock_log_debug_all("PCAP NSE #%lu: Removing event from READ_EVENTS",
+                              nse->id);
+        }
+        #endif
+        break;
+      }
+#endif
+      default:
+        fatal("Event has unknown type (%d)", nse->type);
+    }
+  }
+
+  if (nse->event_done) {
+    /* Security sanity check: don't return a functional SSL iod without
+     * setting an SSL data structure. */
+    if (nse->type == NSE_TYPE_CONNECT_SSL && nse->status == NSE_STATUS_SUCCESS)
+      assert(nse->iod->ssl != NULL);
+
+    nsock_log_debug_all("NSE #%lu: Sending event", nse->id);
+
+    /* WooHoo!  The event is ready to be sent */
+    event_dispatch_and_delete(nsp, nse, 1);
+  }
+}
+
+void process_iod_events(struct npool *nsp, struct niod *nsi, int ev) {
+  int i = 0;
+  /* store addresses of the pointers to the first elements of each kind instead
+   * of storing the values, as a connect can add a read for instance */
+  gh_lnode_t **start_elems[] = {
+    &nsi->first_connect,
+    &nsi->first_read,
+    &nsi->first_write,
+#if HAVE_PCAP
+    &nsi->first_pcap_read,
+#endif
+    NULL
+  };
+  gh_list_t *evlists[] = {
+    &nsp->connect_events,
+    &nsp->read_events,
+    &nsp->write_events,
+#if HAVE_PCAP
+    &nsp->pcap_read_events,
+#endif
+    NULL
+  };
+
+  assert(nsp == nsi->nsp);
+  nsock_log_debug_all("Processing events on IOD %lu (ev=%d)", nsi->id, ev);
+
+  /* We keep the events separate because we want to handle them in the
+   * order: connect => read => write => timer for several reasons:
+   *
+   *  1) Makes sure we have gone through all the net i/o events before
+   *     a timer expires (would be a shame to timeout after the data was
+   *     available but before we delivered the events
+   *
+   *  2) The connect() results often lead to a read or write that can be
+   *     processed in the same cycle.  In the same way, read() often
+   *     leads to write().
+   */
+  for (i = 0; evlists[i] != NULL; i++) {
+    gh_lnode_t *current, *next, *last;
+
+    /* for each list, get the last event and don't look past it as an event
+     * could add another event in the same list and so on... */
+    last = gh_list_last_elem(evlists[i]);
+
+    for (current = *start_elems[i];
+         current != NULL && gh_lnode_prev(current) != last;
+         current = next) {
+      struct nevent *nse;
+
+#if HAVE_PCAP
+      if (evlists[i] == &nsi->nsp->pcap_read_events)
+        nse = lnode_nevent2(current);
+      else
+#endif
+        nse = lnode_nevent(current);
+
+      /* events are grouped by IOD. Break if we're done with the events for the
+       * current IOD */
+      if (nse->iod != nsi)
+        break;
+
+      process_event(nsp, evlists[i], nse, ev);
+      next = gh_lnode_next(current);
+
+      if (nse->event_done) {
+        /* event is done, remove it from the event list and update IOD pointers
+         * to the first events of each kind */
+        update_first_events(nse);
+        gh_list_remove(evlists[i], current);
+        gh_list_append(&nsp->free_events, &nse->nodeq_io);
+
+        if (nse->timeout.tv_sec)
+          gh_heap_remove(&nsp->expirables, &nse->expire);
+      }
+    }
+  }
+}
+
+static int nevent_unref(struct npool *nsp, struct nevent *nse) {
+  switch (nse->type) {
+    case NSE_TYPE_CONNECT:
+    case NSE_TYPE_CONNECT_SSL:
+      gh_list_remove(&nsp->connect_events, &nse->nodeq_io);
+      break;
+
+    case NSE_TYPE_READ:
+      gh_list_remove(&nsp->read_events, &nse->nodeq_io);
+      break;
+
+    case NSE_TYPE_WRITE:
+      gh_list_remove(&nsp->write_events, &nse->nodeq_io);
+      break;
+
+#if HAVE_PCAP
+    case NSE_TYPE_PCAP_READ: {
+      char read = 0;
+      char pcap = 0;
+
+#if PCAP_BSD_SELECT_HACK
+      read = pcap = 1;
+#else
+      if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0)
+        read = 1;
+      else
+        pcap = 1;
+#endif /* PCAP_BSD_SELECT_HACK */
+
+      if (read)
+        gh_list_remove(&nsp->read_events, &nse->nodeq_io);
+      if (pcap)
+        gh_list_remove(&nsp->pcap_read_events, &nse->nodeq_pcap);
+
+      break;
+    }
+#endif /* HAVE_PCAP */
+
+    case NSE_TYPE_TIMER:
+      /* Nothing to do */
+      break;
+
+    default:
+      fatal("Unknown event type %d", nse->type);
+  }
+  gh_list_append(&nsp->free_events, &nse->nodeq_io);
+  return 0;
+}
+
+void process_expired_events(struct npool *nsp) {
+  for (;;) {
+    gh_hnode_t *hnode;
+    struct nevent *nse;
+
+    hnode = gh_heap_min(&nsp->expirables);
+    if (!hnode)
+      break;
+
+    nse = container_of(hnode, struct nevent, expire);
+    if (!event_timedout(nse))
+      break;
+
+    gh_heap_remove(&nsp->expirables, hnode);
+    process_event(nsp, NULL, nse, EV_NONE);
+    assert(nse->event_done);
+    update_first_events(nse);
+    nevent_unref(nsp, nse);
+  }
+}
+
+/* Calling this function will cause nsock_loop to quit on its next iteration
+ * with a return value of NSOCK_LOOP_QUIT. */
+void nsock_loop_quit(nsock_pool nsp) {
+  struct npool *ms = (struct npool *)nsp;
+  ms->quit = 1;
+}
+
+/* Grab the latest time as recorded by the nsock library, which does so at least
+ * once per event loop (in main_loop).  Not only does this function (generally)
+ * avoid a system call, but in many circumstances it is better to use nsock's
+ * time rather than the system time.  If nsock has never obtained the time when
+ * you call it, it will do so before returning */
+const struct timeval *nsock_gettimeofday() {
+  if (nsock_tod.tv_sec == 0)
+    gettimeofday(&nsock_tod, NULL);
+  return &nsock_tod;
+}
+
+/* Adds an event to the appropriate nsp event list, handles housekeeping such as
+ * adjusting the descriptor select/poll lists, registering the timeout value,
+ * etc. */
+void nsock_pool_add_event(struct npool *nsp, struct nevent *nse) {
+  nsock_log_debug("NSE #%lu: Adding event (timeout in %ldms)",
+                  nse->id,
+                  (long)TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
+
+  nsp->events_pending++;
+
+  if (!nse->event_done && nse->timeout.tv_sec) {
+    /* This event is expirable, add it to the queue */
+    gh_heap_push(&nsp->expirables, &nse->expire);
+  }
+
+  /* Now we do the event type specific actions */
+  switch (nse->type) {
+    case NSE_TYPE_CONNECT:
+    case NSE_TYPE_CONNECT_SSL:
+      if (!nse->event_done) {
+        assert(nse->iod->sd >= 0);
+        socket_count_read_inc(nse->iod);
+        socket_count_write_inc(nse->iod);
+        update_events(nse->iod, nsp, nse, EV_READ|EV_WRITE, EV_NONE);
+      }
+      iod_add_event(nse->iod, nse);
+      break;
+
+    case NSE_TYPE_READ:
+      if (!nse->event_done) {
+        assert(nse->iod->sd >= 0);
+        socket_count_read_inc(nse->iod);
+        update_events(nse->iod, nsp, nse, EV_READ, EV_NONE);
+#if HAVE_OPENSSL
+        if (nse->iod->ssl)
+          nse->sslinfo.ssl_desire = SSL_ERROR_WANT_READ;
+#endif
+      }
+      iod_add_event(nse->iod, nse);
+      break;
+
+    case NSE_TYPE_WRITE:
+      if (!nse->event_done) {
+        assert(nse->iod->sd >= 0);
+        socket_count_write_inc(nse->iod);
+        update_events(nse->iod, nsp, nse, EV_WRITE, EV_NONE);
+#if HAVE_OPENSSL
+        if (nse->iod->ssl)
+          nse->sslinfo.ssl_desire = SSL_ERROR_WANT_WRITE;
+#endif
+      }
+      iod_add_event(nse->iod, nse);
+      break;
+
+    case NSE_TYPE_TIMER:
+      /* nothing to do */
+      break;
+
+#if HAVE_PCAP
+    case NSE_TYPE_PCAP_READ: {
+      mspcap *mp = (mspcap *)nse->iod->pcap;
+
+      assert(mp);
+      if (mp->pcap_desc >= 0) { /* pcap descriptor present */
+        if (!nse->event_done) {
+          socket_count_readpcap_inc(nse->iod);
+          update_events(nse->iod, nsp, nse, EV_READ, EV_NONE);
+        }
+        nsock_log_debug_all("PCAP NSE #%lu: Adding event to READ_EVENTS", nse->id);
+
+        #if PCAP_BSD_SELECT_HACK
+        /* when using BSD hack we must do pcap_next() after select().
+         * Let's insert this pcap to bot queues, to selectable and nonselectable.
+         * This will result in doing pcap_next_ex() just before select() */
+        nsock_log_debug_all("PCAP NSE #%lu: Adding event to PCAP_READ_EVENTS", nse->id);
+        #endif
+      } else {
+        /* pcap isn't selectable. Add it to pcap-specific queue. */
+        nsock_log_debug_all("PCAP NSE #%lu: Adding event to PCAP_READ_EVENTS", nse->id);
+      }
+      iod_add_event(nse->iod, nse);
+      break;
+    }
+#endif
+
+    default:
+      fatal("Unknown nsock event type (%d)", nse->type);
+  }
+
+  /* It can happen that the event already completed. In which case we can
+   * already deliver it, even though we're probably not inside nsock_loop(). */
+  if (nse->event_done) {
+    event_dispatch_and_delete(nsp, nse, 1);
+    update_first_events(nse);
+    nevent_unref(nsp, nse);
+  }
+}
+
+/* An event has been completed and the handler is about to be called. This
+ * function writes out tracing data about the event if necessary */
+void nsock_trace_handler_callback(struct npool *ms, struct nevent *nse) {
+  struct niod *nsi;
+  char *str;
+  int strlength = 0;
+  char displaystr[256];
+  char errstr[256];
+
+  if (NsockLogLevel > NSOCK_LOG_INFO)
+    return;
+
+  nsi = nse->iod;
+
+  if (nse->status == NSE_STATUS_ERROR)
+    Snprintf(errstr, sizeof(errstr), "[%s (%d)] ", socket_strerror(nse->errnum),
+             nse->errnum);
+  else
+    errstr[0] = '\0';
+
+  /* Some types have special tracing treatment */
+  switch (nse->type) {
+    case NSE_TYPE_CONNECT:
+    case NSE_TYPE_CONNECT_SSL:
+      nsock_log_info("Callback: %s %s %sfor EID %li [%s]",
+                     nse_type2str(nse->type), nse_status2str(nse->status),
+                     errstr, nse->id, get_peeraddr_string(nsi));
+      break;
+
+    case NSE_TYPE_READ:
+      if (nse->status != NSE_STATUS_SUCCESS) {
+        nsock_log_info("Callback: %s %s %sfor EID %li [%s]",
+                       nse_type2str(nse->type), nse_status2str(nse->status),
+                       errstr, nse->id, get_peeraddr_string(nsi));
+      } else {
+        str = nse_readbuf(nse, &strlength);
+        if (strlength < 80) {
+          memcpy(displaystr, ": ", 2);
+          memcpy(displaystr + 2, str, strlength);
+          displaystr[2 + strlength] = '\0';
+          replacenonprintable(displaystr + 2, strlength, '.');
+        } else {
+          displaystr[0] = '\0';
+        }
+        nsock_log_info("Callback: %s %s for EID %li [%s] %s(%d bytes)%s",
+                       nse_type2str(nse->type), nse_status2str(nse->status),
+                       nse->id,
+                       get_peeraddr_string(nsi),
+                       nse_eof(nse) ? "[EOF]" : "", strlength, displaystr);
+      }
+      break;
+
+    case NSE_TYPE_WRITE:
+      nsock_log_info("Callback: %s %s %sfor EID %li [%s]",
+                     nse_type2str(nse->type), nse_status2str(nse->status),
+                     errstr, nse->id, get_peeraddr_string(nsi));
+      break;
+
+    case NSE_TYPE_TIMER:
+      nsock_log_info("Callback: %s %s %sfor EID %li",
+                     nse_type2str(nse->type), nse_status2str(nse->status),
+                     errstr, nse->id);
+      break;
+
+#if HAVE_PCAP
+    case NSE_TYPE_PCAP_READ:
+      nsock_log_info("Callback: %s %s %sfor EID %li ",
+                     nse_type2str(nse->type), nse_status2str(nse->status),
+                     errstr, nse->id);
+      break;
+#endif
+
+    default:
+      fatal("Invalid nsock event type (%d)", nse->type);
+  }
+}
+
diff --git a/nsock/src/nsock_engines.c b/nsock/src/nsock_engines.c
new file mode 100644
index 0000000..de9d44e
--- /dev/null
+++ b/nsock/src/nsock_engines.c
@@ -0,0 +1,187 @@
+/***************************************************************************
+ * nsock_engines.c -- This contains the functions and definitions to       *
+ * manage the list of available IO engines.  Each IO engine leverages a    *
+ * specific IO notification function to wait for events.  Nsock will try   *
+ * to use the most efficient engine for your system.                       *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#endif
+
+#include "nsock_internal.h"
+
+#if HAVE_IOCP
+  extern struct io_engine engine_iocp;
+  #define ENGINE_IOCP &engine_iocp,
+#else
+  #define ENGINE_IOCP
+#endif /* HAVE_IOCP */
+
+#if HAVE_EPOLL
+  extern struct io_engine engine_epoll;
+  #define ENGINE_EPOLL &engine_epoll,
+#else
+  #define ENGINE_EPOLL
+#endif /* HAVE_EPOLL */
+
+#if HAVE_KQUEUE
+  extern struct io_engine engine_kqueue;
+  #define ENGINE_KQUEUE &engine_kqueue,
+#else
+  #define ENGINE_KQUEUE
+#endif /* HAVE_KQUEUE */
+
+#if HAVE_POLL
+  extern struct io_engine engine_poll;
+  #define ENGINE_POLL &engine_poll,
+#else
+  #define ENGINE_POLL
+#endif /* HAVE_POLL */
+
+/* select() based engine is the fallback engine, we assume it's always available */
+extern struct io_engine engine_select;
+#define ENGINE_SELECT &engine_select,
+
+/* Available IO engines. This depends on which IO management interfaces are
+ * available on your system. Engines must be sorted by order of preference */
+static struct io_engine *available_engines[] = {
+  ENGINE_EPOLL
+  ENGINE_KQUEUE
+  ENGINE_POLL
+  ENGINE_IOCP
+  ENGINE_SELECT
+  NULL
+};
+
+static char *engine_hint;
+
+int posix_iod_connect(struct npool *nsp, int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
+  return connect(sockfd, addr, addrlen);
+}
+
+int posix_iod_read(struct npool *nsp, int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen) {
+  return recvfrom(sockfd, (char *)buf, len, flags, src_addr, addrlen);
+}
+
+int posix_iod_write(struct npool *nsp, int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen) {
+  struct sockaddr_storage *dest = (struct sockaddr_storage *)dest_addr;
+  if (dest->ss_family == AF_UNSPEC)
+    return send(sockfd, (char *)buf, len, flags);
+  else
+    return sendto(sockfd, (char *)buf, len, flags, dest_addr, addrlen);
+}
+
+struct io_operations posix_io_operations = {
+  posix_iod_connect,
+  posix_iod_read,
+  posix_iod_write
+};
+
+struct io_engine *get_io_engine(void) {
+  struct io_engine *engine = NULL;
+  int i;
+
+  if (!engine_hint) {
+    engine = available_engines[0];
+  } else {
+    for (i = 0; available_engines[i] != NULL; i++)
+      if (strcmp(engine_hint, available_engines[i]->name) == 0) {
+        engine = available_engines[i];
+        break;
+      }
+  }
+
+  if (!engine)
+    fatal("No suitable IO engine found! (%s)\n",
+          engine_hint ? engine_hint : "no hint");
+
+  return engine;
+}
+
+int nsock_set_default_engine(char *engine) {
+  if (engine_hint)
+    free(engine_hint);
+
+  if (engine) {
+    int i;
+
+    for (i = 0; available_engines[i] != NULL; i++) {
+      if (strcmp(engine, available_engines[i]->name) == 0) {
+        engine_hint = strdup(engine);
+        return 0;
+      }
+    }
+    return -1;
+  }
+  /* having engine = NULL is fine. This is actually the
+   * way to tell nsock to use the default engine again. */
+  engine_hint = NULL;
+  return 0;
+}
+
+const char *nsock_list_engines(void) {
+  return
+#if HAVE_IOCP
+  "iocp "
+#endif
+#if HAVE_EPOLL
+  "epoll "
+#endif
+#if HAVE_KQUEUE
+  "kqueue "
+#endif
+#if HAVE_POLL
+  "poll "
+#endif
+  "select";
+}
+
diff --git a/nsock/src/nsock_event.c b/nsock/src/nsock_event.c
new file mode 100644
index 0000000..bfc489b
--- /dev/null
+++ b/nsock/src/nsock_event.c
@@ -0,0 +1,538 @@
+/***************************************************************************
+ * nsock_event.c -- Functions dealing with nsock_events (and their         *
+ * struct nevent internal representation.  An event is created when you do       *
+ * various calls (for reading, writing, connecting, timers, etc) and is    *
+ * provided back to you in the callback when the call completes or         *
+ * fails. It is automatically destroyed after the callback returns         *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include "gh_list.h"
+
+#if HAVE_PCAP
+#include "nsock_pcap.h"
+#endif
+
+#include <string.h>
+
+extern struct timeval nsock_tod;
+
+/* Find the type of an event that spawned a callback */
+enum nse_type nse_type(nsock_event nse) {
+  struct nevent *me = (struct nevent *)nse;
+  return me->type;
+}
+
+enum nse_status nse_status(nsock_event nse) {
+  struct nevent *me = (struct nevent *)nse;
+  return me->status;
+}
+
+int nse_eof(nsock_event nse) {
+  struct nevent *me = (struct nevent *)nse;
+  return me->eof;
+}
+
+/* Obtains the nsock_iod (see below) associated with the event.  Note that
+ * some events (such as timers) don't have an nsock_iod associated with them */
+nsock_iod nse_iod(nsock_event ms_event) {
+  struct nevent *nse = (struct nevent *)ms_event;
+  return (nsock_iod) nse->iod;
+}
+
+/* This next function returns the errno style error code -- which is only valid
+ * if the status is NSE_STATUS_ERROR */
+int nse_errorcode(nsock_event nse) {
+  struct nevent *me = (struct nevent *)nse;
+  return me->errnum;
+}
+
+/* Every event has an ID which will be unique throughout the program's execution
+ * unless you use (literally) billions of them */
+nsock_event_id nse_id(nsock_event nse) {
+  struct nevent *me = (struct nevent *)nse;
+  return me->id;
+}
+
+/* If you did a read request, and the result was STATUS_SUCCESS, this function
+ * provides the buffer that was read in as well as the number of chars read.
+ * The buffer should not be modified or free'd */
+char *nse_readbuf(nsock_event nse, int *nbytes) {
+  struct nevent *me = (struct nevent *)nse;
+
+  if (nbytes)
+    *nbytes = fs_length(&(me->iobuf));
+  return fs_str(&(me->iobuf));
+}
+
+static void first_ev_next(struct nevent *nse, gh_lnode_t **first, int nodeq2) {
+  if (!first || !*first)
+    return;
+
+  if (&nse->nodeq_io == *first || &nse->nodeq_pcap == *first) {
+    gh_lnode_t *next;
+
+    next = gh_lnode_next(*first);
+    if (next) {
+      struct nevent *newevent;
+
+      if (nodeq2)
+        newevent = lnode_nevent2(next);
+      else
+        newevent = lnode_nevent(next);
+
+      if (newevent->iod == nse->iod)
+        *first = next;
+      else
+        *first = NULL;
+    } else {
+      *first = NULL;
+    }
+  }
+}
+
+void update_first_events(struct nevent *nse) {
+  switch (get_event_id_type(nse->id)) {
+    case NSE_TYPE_CONNECT:
+    case NSE_TYPE_CONNECT_SSL:
+      first_ev_next(nse, &nse->iod->first_connect, 0);
+      break;
+
+    case NSE_TYPE_READ:
+      first_ev_next(nse, &nse->iod->first_read, 0);
+      break;
+
+    case NSE_TYPE_WRITE:
+      first_ev_next(nse, &nse->iod->first_write, 0);
+      break;
+
+#if HAVE_PCAP
+    case NSE_TYPE_PCAP_READ:
+      first_ev_next(nse, &nse->iod->first_read, 0);
+      first_ev_next(nse, &nse->iod->first_pcap_read, 1);
+      break;
+#endif
+
+    case NSE_TYPE_TIMER:
+      /* nothing to do */
+      break;
+
+    default:
+      fatal("Bogus event type in update_first_events");
+      break;
+  }
+}
+
+/* Cancel an event (such as a timer or read request).  If notify is nonzero, the
+ * requester will be sent an event CANCELLED status back to the given handler.
+ * But in some cases there is no need to do this (like if the function deleting
+ * it is the one which created it), in which case 0 can be passed to skip the
+ * step.  This function returns zero if the event is not found, nonzero
+ * otherwise. */
+int nsock_event_cancel(nsock_pool ms_pool, nsock_event_id id, int notify) {
+  struct npool *nsp = (struct npool *)ms_pool;
+  enum nse_type type;
+  unsigned int i;
+  gh_list_t *event_list = NULL, *event_list2 = NULL;
+  gh_lnode_t *current, *next;
+  struct nevent *nse = NULL;
+
+  assert(nsp);
+
+  type = get_event_id_type(id);
+  nsock_log_info("Event #%li (type %s) cancelled", id, nse_type2str(type));
+
+  /* First we figure out what list it is in */
+  switch (type) {
+    case NSE_TYPE_CONNECT:
+    case NSE_TYPE_CONNECT_SSL:
+      event_list = &nsp->connect_events;
+      break;
+
+    case NSE_TYPE_READ:
+      event_list = &nsp->read_events;
+      break;
+
+    case NSE_TYPE_WRITE:
+      event_list = &nsp->write_events;
+      break;
+
+    case NSE_TYPE_TIMER:
+      for (i = 0; i < gh_heap_count(&nsp->expirables); i++) {
+        gh_hnode_t *hnode;
+
+        hnode = gh_heap_find(&nsp->expirables, i);
+        nse = container_of(hnode, struct nevent, expire);
+        if (nse->id == id)
+          return nevent_delete(nsp, nse, NULL, NULL, notify);
+      }
+      return 0;
+
+#if HAVE_PCAP
+    case NSE_TYPE_PCAP_READ:
+      event_list  = &nsp->read_events;
+      event_list2 = &nsp->pcap_read_events;
+      break;
+#endif
+
+    default:
+      fatal("Bogus event type in nsock_event_cancel"); break;
+  }
+
+  /* Now we try to find the event in the list */
+  for (current = gh_list_first_elem(event_list); current != NULL; current = next) {
+    next = gh_lnode_next(current);
+    nse = lnode_nevent(current);
+    if (nse->id == id)
+      break;
+  }
+
+  if (current == NULL && event_list2) {
+    event_list = event_list2;
+    for (current = gh_list_first_elem(event_list); current != NULL; current = next) {
+      next = gh_lnode_next(current);
+      nse = lnode_nevent2(current);
+      if (nse->id == id)
+        break;
+    }
+  }
+  if (current == NULL)
+    return 0;
+
+  return nevent_delete(nsp, nse, event_list, current, notify);
+}
+
+/* An internal function for cancelling an event when you already have a pointer
+ * to the struct nevent (use nsock_event_cancel if you just have an ID). The
+ * event_list passed in should correspond to the type of the event. For example,
+ * with NSE_TYPE_READ, you would pass in &nsp->read_events;. elem is the list
+ * element in event_list which holds the event.  Pass a nonzero for notify if
+ * you want the program owning the event to be notified that it has been
+ * cancelled */
+int nevent_delete(struct npool *nsp, struct nevent *nse, gh_list_t *event_list,
+                   gh_lnode_t *elem, int notify) {
+  if (nse->event_done) {
+    /* This event has already been marked for death somewhere else -- it will be
+     * gone soon (and if we try to kill it now all hell will break loose due to
+     * reentrancy. */
+    return 0;
+  }
+
+  nsock_log_info("%s on event #%li (type %s)", __func__, nse->id,
+                 nse_type2str(nse->type));
+
+  /* Now that we found the event... we go through the motions of cleanly
+   * cancelling it */
+  switch (nse->type) {
+    case NSE_TYPE_CONNECT:
+    case NSE_TYPE_CONNECT_SSL:
+      handle_connect_result(nsp, nse, NSE_STATUS_CANCELLED);
+      break;
+
+    case NSE_TYPE_READ:
+      handle_read_result(nsp, nse, NSE_STATUS_CANCELLED);
+      break;
+
+    case NSE_TYPE_WRITE:
+      handle_write_result(nsp, nse, NSE_STATUS_CANCELLED);
+      break;
+
+    case NSE_TYPE_TIMER:
+      handle_timer_result(nsp, nse, NSE_STATUS_CANCELLED);
+      break;
+
+#if HAVE_PCAP
+    case NSE_TYPE_PCAP_READ:
+      handle_pcap_read_result(nsp, nse, NSE_STATUS_CANCELLED);
+      break;
+#endif
+
+    default:
+      fatal("Invalid nsock event type (%d)", nse->type);
+  }
+
+  assert(nse->event_done);
+
+  if (nse->timeout.tv_sec)
+    gh_heap_remove(&nsp->expirables, &nse->expire);
+
+  if (event_list) {
+    update_first_events(nse);
+    gh_list_remove(event_list, elem);
+  }
+
+  gh_list_append(&nsp->free_events, &nse->nodeq_io);
+
+  nsock_log_debug_all("NSE #%lu: Removing event from list", nse->id);
+
+#if HAVE_PCAP
+#if PCAP_BSD_SELECT_HACK
+  if (nse->type == NSE_TYPE_PCAP_READ) {
+    nsock_log_debug_all("PCAP NSE #%lu: CANCEL TEST pcap=%p read=%p curr=%p sd=%i",
+                        nse->id, &nsp->pcap_read_events, &nsp->read_events,
+                        event_list,((mspcap *)nse->iod->pcap)->pcap_desc);
+
+    /* If event occurred, and we're in BSD_HACK mode, then this event was added to
+     * two queues. read_event and pcap_read_event Of course we should
+     * destroy it only once.  I assume we're now in read_event, so just unlink
+     * this event from pcap_read_event */
+    if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0 && event_list == &nsp->read_events) {
+      /* event is done, list is read_events and we're in BSD_HACK mode. So unlink
+       * event from pcap_read_events */
+      gh_list_remove(&nsp->pcap_read_events, &nse->nodeq_pcap);
+      nsock_log_debug_all("PCAP NSE #%lu: Removing event from PCAP_READ_EVENTS", nse->id);
+    }
+
+    if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0 && event_list == &nsp->pcap_read_events) {
+      /* event is done, list is read_events and we're in BSD_HACK mode.
+       * So unlink event from read_events */
+      gh_list_remove(&nsp->read_events, &nse->nodeq_io);
+
+      nsock_log_debug_all("PCAP NSE #%lu: Removing event from READ_EVENTS", nse->id);
+    }
+  }
+#endif
+#endif
+  event_dispatch_and_delete(nsp, nse, notify);
+  return 1;
+}
+
+/* Adjust various statistics, dispatches the event handler (if notify is
+ * nonzero) and then deletes the event.  This function does NOT delete the event
+ * from any lists it might be on (eg nsp->read_list etc.) nse->event_done
+ * MUST be true when you call this */
+void event_dispatch_and_delete(struct npool *nsp, struct nevent *nse, int notify) {
+  assert(nsp);
+  assert(nse);
+
+  assert(nse->event_done);
+
+  nsp->events_pending--;
+  assert(nsp->events_pending >= 0);
+
+  if (nse->iod) {
+    nse->iod->events_pending--;
+    assert(nse->iod->events_pending >= 0);
+  }
+
+  if (notify) {
+    nsock_trace_handler_callback(nsp, nse);
+    nse->handler(nsp, nse, nse->userdata);
+  }
+
+  /* FIXME: We should be updating stats here ... */
+
+  /* Now we clobber the event ... */
+  event_delete(nsp, nse);
+}
+
+/* OK -- the idea is that we want the type included in the rightmost two bits
+ * and the serial number in the leftmost 30 or 62.  But we also want to insure a
+ * correct wrap-around in the case of an obscene number of event.  One
+ * definition of a "correct" wraparound is that it goes from the highest number
+ * back to one (not zero) because we don't want event numbers to ever be zero.
+ * */
+nsock_event_id get_new_event_id(struct npool *ms, enum nse_type type) {
+  int type_code = (int)type;
+  unsigned long serial = ms->next_event_serial++;
+  unsigned long max_serial_allowed;
+  int shiftbits;
+
+  assert(type < NSE_TYPE_MAX);
+
+  shiftbits = sizeof(nsock_event_id) * 8 - TYPE_CODE_NUM_BITS;
+  max_serial_allowed = ((unsigned long)1 << shiftbits) - 1;
+  if (serial == max_serial_allowed) {
+    /* then the next serial will be one because 0 is forbidden */
+    ms->next_event_serial = 1;
+  }
+
+  return (serial << TYPE_CODE_NUM_BITS) | type_code;
+}
+
+/* Take an event ID and return the type (NSE_TYPE_CONNECT, etc */
+enum nse_type get_event_id_type(nsock_event_id event_id) {
+  return (enum nse_type)((event_id & ((1 << TYPE_CODE_NUM_BITS) - 1)));
+}
+
+/* Create a new event structure -- must be deleted later with event_delete,
+ * unless it returns NULL (failure).  NULL can be passed in for the struct niod
+ * and the userdata if not available */
+struct nevent *event_new(struct npool *nsp, enum nse_type type,
+                           struct niod *iod, int timeout_msecs,
+                           nsock_ev_handler handler, void *userdata) {
+  struct nevent *nse;
+  gh_lnode_t *lnode;
+
+  /* Bring us up to date for the timeout calculation. */
+  gettimeofday(&nsock_tod, NULL);
+
+  if (iod) {
+    iod->events_pending++;
+    assert(iod->state != NSIOD_STATE_DELETED);
+  }
+
+  /* First we check if one is available from the free list ... */
+  lnode = gh_list_pop(&nsp->free_events);
+  if (!lnode)
+    nse = (struct nevent *)safe_malloc(sizeof(*nse));
+  else
+    nse = lnode_nevent(lnode);
+
+  memset(nse, 0, sizeof(*nse));
+
+  nse->id = get_new_event_id(nsp, type);
+  nse->type = type;
+  nse->status = NSE_STATUS_NONE;
+  gh_hnode_invalidate(&nse->expire);
+#if HAVE_OPENSSL
+  nse->sslinfo.ssl_desire = SSL_ERROR_NONE;
+#endif
+
+  if (type == NSE_TYPE_READ || type ==  NSE_TYPE_WRITE)
+    filespace_init(&(nse->iobuf), 1024);
+
+#if HAVE_PCAP
+  if (type == NSE_TYPE_PCAP_READ) {
+    mspcap *mp;
+    int sz;
+
+    assert(iod != NULL);
+    mp = (mspcap *)iod->pcap;
+    assert(mp);
+
+    sz = mp->snaplen+1 + sizeof(nsock_pcap);
+    filespace_init(&(nse->iobuf), sz);
+  }
+#endif
+
+  if (timeout_msecs != -1) {
+    assert(timeout_msecs >= 0);
+    TIMEVAL_MSEC_ADD(nse->timeout, nsock_tod, timeout_msecs);
+  }
+
+  nse->iod = iod;
+  nse->handler = handler;
+  nse->userdata = userdata;
+
+  if (nse->iod == NULL)
+    nsock_log_debug("%s (IOD #NULL) (EID #%li)", __func__, nse->id);
+  else
+    nsock_log_debug("%s (IOD #%li) (EID #%li)", __func__, nse->iod->id,
+                    nse->id);
+  return nse;
+}
+
+/* Free an struct nevent which was allocated with event_new, including all internal
+ * resources.  Note -- we assume that nse->iod->events_pending (if it exists)
+ * has ALREADY been decremented (done during event_dispatch_and_delete) -- so
+ * remember to do this if you call event_delete() directly */
+void event_delete(struct npool *nsp, struct nevent *nse) {
+  if (nse->iod == NULL)
+    nsock_log_debug("%s (IOD #NULL) (EID #%li)", __func__, nse->id);
+  else
+    nsock_log_debug("%s (IOD #%li) (EID #%li)", __func__, nse->iod->id, nse->id);
+
+  /* First free the IOBuf inside it if necessary */
+  if (nse->type == NSE_TYPE_READ || nse->type ==  NSE_TYPE_WRITE) {
+    fs_free(&nse->iobuf);
+  }
+  #if HAVE_PCAP
+  if (nse->type == NSE_TYPE_PCAP_READ) {
+    fs_free(&nse->iobuf);
+    nsock_log_debug_all("PCAP removed %lu", nse->id);
+  }
+  #endif
+
+  /* Now we add the event back into the free pool */
+  nse->event_done = 1;
+}
+
+
+/* Takes an nse_type (as returned by nse_type() and returns a static string name
+ * that you can use for printing, etc. */
+const char *nse_type2str(enum nse_type type) {
+  switch (type) {
+    case NSE_TYPE_CONNECT: return "CONNECT";
+    case NSE_TYPE_CONNECT_SSL: return "SSL-CONNECT";
+    case NSE_TYPE_READ: return "READ";
+    case NSE_TYPE_WRITE: return "WRITE";
+    case NSE_TYPE_TIMER: return "TIMER";
+    case NSE_TYPE_PCAP_READ: return "READ-PCAP";
+    default:
+      return "UNKNOWN!";
+  }
+}
+
+/* Takes an nse_status (as returned by nse_status() and returns a static string
+ * name that you can use for printing, etc. */
+const char *nse_status2str(enum nse_status status) {
+  switch (status) {
+    case NSE_STATUS_NONE: return "NONE";
+    case NSE_STATUS_SUCCESS: return "SUCCESS";
+    case NSE_STATUS_ERROR: return "ERROR";
+    case NSE_STATUS_TIMEOUT: return "TIMEOUT";
+    case NSE_STATUS_CANCELLED: return "CANCELLED";
+    case NSE_STATUS_KILL: return "KILL";
+    case NSE_STATUS_EOF: return "EOF";
+    case NSE_STATUS_PROXYERROR: return "PROXY ERROR";
+    default:
+      return "UNKNOWN!";
+  }
+}
+
+int event_timedout(struct nevent *nse) {
+  if (nse->event_done)
+    return 0;
+
+  return (nse->timeout.tv_sec && !TIMEVAL_AFTER(nse->timeout, nsock_tod));
+}
diff --git a/nsock/src/nsock_internal.h b/nsock/src/nsock_internal.h
new file mode 100644
index 0000000..dc47c3f
--- /dev/null
+++ b/nsock/src/nsock_internal.h
@@ -0,0 +1,522 @@
+/***************************************************************************
+ * nsock_internal.h -- PRIVATE interface definitions for the guts of the   *
+ * nsock parallel socket event library. Applications calling this library  *
+ * should NOT include this. even LOOK at these :).                         *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef NSOCK_INTERNAL_H
+#define NSOCK_INTERNAL_H
+
+#include <nbase.h>
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#include "nbase_config.h"
+#endif
+
+#ifdef WIN32
+#include "nbase_winconfig.h"
+#include <Winsock2.h>
+#endif
+
+#include "gh_list.h"
+#include "gh_heap.h"
+#include "filespace.h"
+#include "nsock.h" /* The public interface -- I need it for some enum defs */
+#include "nsock_ssl.h"
+#include "nsock_proxy.h"
+
+#if HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#if HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#if HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#if HAVE_STRING_H
+#include <string.h>
+#endif
+#if HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#if HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+
+#ifndef IPPROTO_SCTP
+#define IPPROTO_SCTP 132
+#endif
+
+
+/* ------------------- CONSTANTS ------------------- */
+#define READ_BUFFER_SZ 8192
+
+enum nsock_read_types {
+  NSOCK_READLINES,
+  NSOCK_READBYTES,
+  NSOCK_READ
+};
+
+enum iod_state {
+  NSIOD_STATE_DELETED,
+  NSIOD_STATE_INITIAL,
+
+  /* sd was provided to us in nsock_iod_new2 (see nsock_iod.c) */
+  NSIOD_STATE_UNKNOWN,
+
+  NSIOD_STATE_CONNECTED_TCP,
+  NSIOD_STATE_CONNECTED_UDP
+};
+
+/* XXX: ensure that these values can be OR'ed when adding new ones */
+#define EV_NONE   0x00
+#define EV_READ   0x01
+#define EV_WRITE  0x02
+#define EV_EXCEPT 0x04
+
+
+/* ------------------- STRUCTURES ------------------- */
+
+struct readinfo {
+  enum nsock_read_types read_type;
+  /* num lines; num bytes; whatever (depends on read_type) */
+  int num;
+};
+
+struct writeinfo {
+  struct sockaddr_storage dest;
+  size_t destlen;
+  /* Number of bytes successfully written */
+  int written_so_far;
+};
+
+/* Remember that callers of this library should NOT be accessing these
+ * fields directly */
+struct npool {
+  /* User data, NULL if unset */
+  void *userdata;
+
+  /* IO Engine vtable */
+  struct io_engine *engine;
+  /* IO Engine internal data */
+  void *engine_data;
+
+  /* Active network events */
+  gh_list_t connect_events;
+  gh_list_t read_events;
+  gh_list_t write_events;
+#if HAVE_PCAP
+  gh_list_t pcap_read_events;
+#endif
+  gh_heap_t expirables;
+
+  /* Active iods and related lists of events */
+  gh_list_t active_iods;
+
+  /* struct niod structures that have been freed for reuse */
+  gh_list_t free_iods;
+  /* When an event is deleted, we stick it here for later reuse */
+  gh_list_t free_events;
+
+  /* Number of events pending (total) on all lists */
+  int events_pending;
+
+  /* Serial # of next event (used to create next nsock_event_id */
+  unsigned long next_event_serial;
+  /* Serial # of next iod to be created */
+  unsigned long next_iod_serial;
+
+  /* If nsock_loop() returns NSOCK_LOOP_ERROR, this is where we describe the
+   * error (errnum fashion) */
+  int errnum;
+
+  /* If true, new sockets will have SO_BROADCAST set */
+  int broadcast;
+
+  /* Interface to bind to; only supported on Linux with SO_BINDTODEVICE sockopt. */
+  const char *device;
+
+  /* If true, exit the next iteration of nsock_loop with a status of
+   * NSOCK_LOOP_QUIT. */
+  int quit;
+
+#if HAVE_OPENSSL
+  /* The SSL Context (options and such) */
+  SSL_CTX *sslctx;
+#ifdef HAVE_DTLS_CLIENT_METHOD
+  SSL_CTX *dtlsctx;
+#endif
+#endif
+
+  /* Optional proxy chain (NULL is not set). Can only be set once per NSP (using
+   * nsock_proxychain_new() or nsock_pool_set_proxychain(). */
+  struct proxy_chain *px_chain;
+
+};
+
+
+/* nsock_iod is like a "file descriptor" for the nsock library.  You use it to
+ * request events. */
+struct niod {
+  /* The socket descriptor related to the event */
+  int sd;
+
+  /* Number of pending events on this iod */
+  int events_pending;
+
+  /* Pending events */
+  gh_lnode_t *first_connect;
+  gh_lnode_t *first_read;
+  gh_lnode_t *first_write;
+#if HAVE_PCAP
+  gh_lnode_t *first_pcap_read;
+#endif
+
+  int readsd_count;
+  int writesd_count;
+#if HAVE_PCAP
+  int readpcapsd_count;
+#endif
+
+  int watched_events;
+
+  /* The struct npool used to create the iod (used for deletion) */
+  struct npool *nsp;
+
+  enum iod_state state;
+
+  /* The host and port we are connected to using sd (saves a call to getpeername) */
+  struct sockaddr_storage peer;
+  /* The host and port to bind to with sd */
+  struct sockaddr_storage local;
+
+  /* The length of peer/local actually used (sizeof(sockaddr_in) or
+   * sizeof(sockaddr_in6), SUN_LEN(sockaddr_un), or 0 if peer/local
+   * has not been filled in */
+  size_t locallen;
+  size_t peerlen;
+
+  /* -1 if none yet, otherwise IPPROTO_TCP, etc. */
+  int lastproto;
+
+  /* The struct npool keeps track of NIODs that have been allocated so that it
+   * can destroy them if the msp is deleted.  This pointer makes it easy to
+   * remove this struct niod from the allocated list when necessary */
+  gh_lnode_t nodeq;
+
+#define IOD_REGISTERED  0x01
+#define IOD_PROCESSED   0x02    /* internally used by engine_kqueue.c */
+
+#define IOD_PROPSET(iod, flag)  ((iod)->_flags |= (flag))
+#define IOD_PROPCLR(iod, flag)  ((iod)->_flags &= ~(flag))
+#define IOD_PROPGET(iod, flag)  (((iod)->_flags & (flag)) != 0)
+  char _flags;
+
+  /* Used for SSL Server Name Indication. */
+  char *hostname;
+
+#if HAVE_OPENSSL
+  /* An SSL connection (or NULL if none) */
+  SSL *ssl;
+  /* SSL SESSION ID (or NULL if none) */
+  SSL_SESSION *ssl_session;
+#else
+  /* Because there are many if (nsi->ssl) cases in the code */
+  char *ssl;
+#endif
+  /* Every iod has an id which is always unique for the same nspool (unless you
+   * create billions of them) */
+  unsigned long id;
+
+  /* No. of bytes read from the sd*/
+  unsigned long read_count;
+  /* No. of bytes written to the sd */
+  unsigned long write_count;
+
+  void *userdata;
+
+  /* IP options to set on socket before connect() */
+  void *ipopts;
+  int ipoptslen;
+
+  /* Pointer to mspcap struct (used only if pcap support is included) */
+  void *pcap;
+
+  struct proxy_chain_context *px_ctx;
+
+};
+
+
+/* nsock_event_t handles a single event.  Its ID is generally returned when the
+ * event is created, and the event is included in callbacks */
+struct nevent {
+  /* Every event has an ID which is unique for a given nsock unless you blow
+   * through more than 500,000,000 events */
+  nsock_event_id id;
+
+  enum nse_type type;
+  enum nse_status status;
+
+  /* For write events, this is the data to be written, for read events, this is
+   * what we will read into */
+  struct filespace iobuf;
+
+  /* The timeout of the event -- absolute time
+   * except that tv_sec == 0 means no timeout */
+  struct timeval timeout;
+
+  /* Info pertaining to READ requests */
+  struct readinfo readinfo;
+  /* Info pertaining to WRITE requests */
+  struct writeinfo writeinfo;
+
+#if HAVE_OPENSSL
+  struct sslinfo sslinfo;
+#endif
+
+  /* If we return a status of NSE_STATUS_ERROR, this must be set */
+  int errnum;
+
+  /* The nsock I/O descriptor related to event (if applicable) */
+  struct niod *iod;
+
+  /* The handler to call when event is complete */
+  nsock_ev_handler handler;
+
+  /* slot in the expirable binheap */
+  gh_hnode_t expire;
+
+  /* For some reasons (see nsock_pcap.c) we register pcap events as both read
+   * and pcap_read events when in PCAP_BSD_SELECT_HACK mode. We then need two
+   * gh_lnode_t handles. To make code simpler, we _always_ use _nodeq_pcap for
+   * pcap_read events and _nodeq_io for the other ones.
+   * When not in PCAP_BSD_SELECT_HACK mode we define both handles as members
+   * of an union to optimize memory footprint. */
+  gh_lnode_t nodeq_io;
+  gh_lnode_t nodeq_pcap;
+
+  /* Optional (NULL if unset) pointer to pass to the handler */
+  void *userdata;
+
+  /* If this event is all filled out and ready for immediate delivery,
+   * event_done is nonzero.  Used when event is finished at unexpected time and
+   * we want to dispatch it later to avoid duplicating stat update code and all
+   * that other crap */
+  unsigned int event_done: 1;
+  unsigned int eof: 1;
+
+#if HAVE_IOCP
+  struct extended_overlapped *eov;
+#endif
+};
+
+struct io_operations {
+  int(*iod_connect)(struct npool *nsp, int sockfd, const struct sockaddr *addr, socklen_t addrlen);
+
+  int(*iod_read)(struct npool *nsp, int sockfd, void *buf, size_t len, int flags,
+    struct sockaddr *src_addr, socklen_t *addrlen);
+
+  int(*iod_write)(struct npool *nsp, int sockfd, const void *buf, size_t len, int flags,
+    const struct sockaddr *dest_addr, socklen_t addrlen);
+};
+
+struct io_engine {
+  /* Human readable identifier for this engine. */
+  const char *name;
+
+  /* Engine constructor */
+  int (*init)(struct npool *nsp);
+
+  /* Engine destructor */
+  void (*destroy)(struct npool *nsp);
+
+  /* Register a new IOD to the engine */
+  int(*iod_register)(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev);
+
+  /* Remove a registered IOD */
+  int(*iod_unregister)(struct npool *nsp, struct niod *iod);
+
+  /* Modify events for a registered IOD.
+   *  - ev_set represent the events to add
+   *  - ev_clr represent the events to delete (if set) */
+  int (*iod_modify)(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr);
+
+  /* Main engine loop */
+  int (*loop)(struct npool *nsp, int msec_timeout);
+
+  /* I/O operations */
+  struct io_operations *io_operations;
+};
+
+/* ----------- NSOCK I/O ENGINE CONVENIENCE WRAPPERS ------------ */
+static inline int nsock_engine_init(struct npool *nsp) {
+  return nsp->engine->init(nsp);
+}
+
+static inline void nsock_engine_destroy(struct npool *nsp) {
+  nsp->engine->destroy(nsp);
+  return;
+}
+
+static inline int nsock_engine_iod_register(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev) {
+  return nsp->engine->iod_register(nsp, iod, nse, ev);
+}
+
+static inline int nsock_engine_iod_unregister(struct npool *nsp, struct niod *iod) {
+  return nsp->engine->iod_unregister(nsp, iod);
+}
+
+static inline int nsock_engine_iod_modify(struct npool *nsp, struct niod *iod, struct nevent *nse, int ev_set, int ev_clr) {
+  return nsp->engine->iod_modify(nsp, iod, nse, ev_set, ev_clr);
+}
+
+static inline int nsock_engine_loop(struct npool *nsp, int msec_timeout) {
+  return nsp->engine->loop(nsp, msec_timeout);
+}
+
+/* ------------------- PROTOTYPES ------------------- */
+
+int event_timedout(struct nevent *nse);
+
+/* Get a new nsock_event_id, given a type */
+nsock_event_id get_new_event_id(struct npool *nsp, enum nse_type type);
+
+/* Take an event ID and return the type (NSE_TYPE_CONNECT, etc */
+enum nse_type get_event_id_type(nsock_event_id event_id);
+
+/* Create a new event structure -- must be deleted later with event_delete,
+ * unless it returns NULL (failure).  NULL can be passed in for the struct niod and
+ * the userdata if not available. */
+struct nevent *event_new(struct npool *nsp, enum nse_type type, struct niod *iod,
+                           int timeout_msecs, nsock_ev_handler handler, void *userdata);
+
+/* An internal function for cancelling an event when you already have a pointer
+ * to the struct nevent (use nsock_event_cancel if you just have an ID).  The
+ * event_list passed in should correspond to the type of the event.  For
+ * example, with NSE_TYPE_READ, you would pass in &iod->read_events;.  elem
+ * is the list element in event_list which holds the event.  Pass a nonzero for
+ * notify if you want the program owning the event to be notified that it has
+ * been cancelled */
+int nevent_delete(struct npool *nsp, struct nevent *nse, gh_list_t *event_list, gh_lnode_t *elem, int notify);
+
+/* Adjust various statistics, dispatches the event handler (if notify is
+ * nonzero) and then deletes the event.  This function does NOT delete the event
+ * from any lists it might be on (eg nsp->read_list etc.) nse->event_done
+ * MUST be true when you call this */
+void event_dispatch_and_delete(struct npool *nsp, struct nevent *nse, int notify);
+
+/* Free an struct nevent which was allocated with event_new, including all internal
+ * resources.  Note -- we assume that nse->iod->events_pending (if it exists)
+ * has ALREADY been decremented (done during event_dispatch_and_delete) -- so
+ * remember to do this if you call event_delete() directly */
+void event_delete(struct npool *nsp, struct nevent *nse);
+
+/* Add an event to the appropriate nsp event list, handles housekeeping such as
+ * adjusting the descriptor select/poll lists, registering the timeout value,
+ * etc. */
+void nsock_pool_add_event(struct npool *nsp, struct nevent *nse);
+
+void nsock_connect_internal(struct npool *ms, struct nevent *nse, int type, int proto, struct sockaddr_storage *ss, size_t sslen, unsigned int port);
+
+/* Comments on using the following handle_*_result functions are available in nsock_core.c */
+
+/* handle_connect_results assumes that select or poll have already shown the
+ * descriptor to be active */
+void handle_connect_result(struct npool *ms, struct nevent *nse, enum nse_status status);
+
+void handle_read_result(struct npool *ms, struct nevent *nse, enum nse_status status);
+
+void handle_write_result(struct npool *ms, struct nevent *nse, enum nse_status status);
+
+void handle_timer_result(struct npool *ms, struct nevent *nse, enum nse_status status);
+
+#if HAVE_PCAP
+void handle_pcap_read_result(struct npool *ms, struct nevent *nse, enum nse_status status);
+#endif
+
+/* An event has been completed and the handler is about to be called.  This
+ * function writes out tracing data about the event if necessary */
+void nsock_trace_handler_callback(struct npool *ms, struct nevent *nse);
+
+#if HAVE_OPENSSL
+/* Sets the ssl session of an nsock_iod, increments usage count.  The session
+ * should not have been set yet (as no freeing is done) */
+void nsi_set_ssl_session(struct niod *iod, SSL_SESSION *sessid);
+#endif
+
+static inline struct nevent *next_expirable_event(struct npool *nsp) {
+  gh_hnode_t *hnode;
+
+  hnode = gh_heap_min(&nsp->expirables);
+  if (!hnode)
+    return NULL;
+
+  return container_of(hnode, struct nevent, expire);
+}
+
+static inline struct nevent *lnode_nevent(gh_lnode_t *lnode) {
+  return container_of(lnode, struct nevent, nodeq_io);
+}
+
+static inline struct nevent *lnode_nevent2(gh_lnode_t *lnode) {
+  return container_of(lnode, struct nevent, nodeq_pcap);
+}
+
+#endif /* NSOCK_INTERNAL_H */
+
diff --git a/nsock/src/nsock_iod.c b/nsock/src/nsock_iod.c
new file mode 100644
index 0000000..d74ab5e
--- /dev/null
+++ b/nsock/src/nsock_iod.c
@@ -0,0 +1,455 @@
+/***************************************************************************
+ * nsock_iod.c -- This contains the functions relating to nsock_iod (and   *
+ * its nsock internal manifestation -- nsockiod.  This is is similar to a  *
+ * file descriptor in that you create it and then use it to initiate       *
+ * connections, read/write data, etc.                                      *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include "gh_list.h"
+#include "netutils.h"
+
+#if HAVE_PCAP
+#include "nsock_pcap.h"
+#endif
+
+#include <string.h>
+
+
+/* nsock_iod is like a "file descriptor" for the nsock library. You use it to
+ * request events. And here is how you create an nsock_iod. nsock_iod_new returns
+ * NULL if the iod cannot be allocated. Pass NULL as userdata if you don't want
+ * to immediately associate any user data with the iod. */
+nsock_iod nsock_iod_new(nsock_pool nsockp, void *userdata) {
+  return nsock_iod_new2(nsockp, -1, userdata);
+}
+
+/* This version allows you to associate an existing sd with the msi so that you
+ * can read/write it using the nsock infrastructure.  For example, you may want
+ * to watch for data from STDIN_FILENO at the same time as you read/write
+ * various sockets.  STDIN_FILENO is a special case, however. Any other sd is
+ * dup()ed, so you may close or otherwise manipulate your copy.  The duped copy
+ * will be destroyed when the nsi is destroyed. */
+nsock_iod nsock_iod_new2(nsock_pool nsockp, int sd, void *userdata) {
+  struct npool *nsp = (struct npool *)nsockp;
+  gh_lnode_t *lnode;
+  struct niod *nsi;
+
+  lnode = gh_list_pop(&nsp->free_iods);
+  if (!lnode) {
+    nsi = (struct niod *)safe_malloc(sizeof(*nsi));
+    memset(nsi, 0, sizeof(*nsi));
+  } else {
+    nsi = container_of(lnode, struct niod, nodeq);
+  }
+
+  if (sd == -1) {
+    nsi->sd = -1;
+    nsi->state = NSIOD_STATE_INITIAL;
+  } else if (sd == STDIN_FILENO) {
+    nsi->sd = STDIN_FILENO;
+    nsi->state = NSIOD_STATE_UNKNOWN;
+  } else {
+    nsi->sd = dup_socket(sd);
+    if (nsi->sd == -1) {
+      free(nsi);
+      return NULL;
+    }
+    unblock_socket(nsi->sd);
+    nsi->state = NSIOD_STATE_UNKNOWN;
+  }
+
+  nsi->first_connect = NULL;
+  nsi->first_read = NULL;
+  nsi->first_write = NULL;
+#if HAVE_PCAP
+  nsi->first_pcap_read = NULL;
+  nsi->readpcapsd_count = 0;
+#endif
+  nsi->readsd_count = 0;
+  nsi->write_count = 0;
+
+  nsi->userdata = userdata;
+  nsi->nsp = (struct npool *)nsockp;
+
+  nsi->_flags = 0;
+
+  nsi->read_count = 0;
+  nsi->write_count = 0;
+
+  nsi->hostname = NULL;
+
+  nsi->ipopts = NULL;
+  nsi->ipoptslen = 0;
+
+#if HAVE_OPENSSL
+  nsi->ssl_session = NULL;
+#endif
+
+  if (nsp->px_chain) {
+    nsi->px_ctx = proxy_chain_context_new(nsp);
+  } else {
+    nsi->px_ctx = NULL;
+  }
+
+  nsi->id = nsp->next_iod_serial++;
+  if (nsi->id == 0)
+    nsi->id = nsp->next_iod_serial++;
+
+  /* The nsp keeps track of active iods so it can delete them if it is deleted */
+  gh_list_append(&nsp->active_iods, &nsi->nodeq);
+
+  nsock_log_info("nsock_iod_new (IOD #%lu)", nsi->id);
+
+  return (nsock_iod)nsi;
+}
+
+/* Defined in nsock_core.c. */
+int socket_count_zero(struct niod *iod, struct npool *ms);
+
+/* If nsock_iod_new returned success, you must free the iod when you are done with
+ * it to conserve memory (and in some cases, sockets).  After this call,
+ * nsockiod may no longer be used -- you need to create a new one with
+ * nsock_iod_new().  pending_response tells what to do with any events that are
+ * pending on this nsock_iod.  This can be NSOCK_PENDING_NOTIFY (send a KILL
+ * notification to each event), NSOCK_PENDING_SILENT (do not send notification
+ * to the killed events), or NSOCK_PENDING_ERROR (print an error message and
+ * quit the program) */
+void nsock_iod_delete(nsock_iod nsockiod, enum nsock_del_mode pending_response) {
+#if HAVE_PCAP
+#define NUM_EVT_TYPES 4
+#else
+#define NUM_EVT_TYPES 3
+#endif
+  struct niod *nsi = (struct niod *)nsockiod;
+  gh_lnode_t *evlist_ar[NUM_EVT_TYPES];
+  gh_list_t *corresp_list[NUM_EVT_TYPES];
+  int i;
+  gh_lnode_t *current, *next;
+
+  assert(nsi);
+
+  if (nsi->state == NSIOD_STATE_DELETED) {
+    /* This nsi is already marked as deleted, will probably be removed from the
+     * list very soon. Just return to avoid breaking reentrancy. */
+    return;
+  }
+
+  nsock_log_info("nsock_iod_delete (IOD #%lu)", nsi->id);
+
+  if (nsi->events_pending > 0) {
+    /* shit -- they killed the struct niod while an event was still pending on it.
+     * Maybe I should store the pending events in the iod.  On the other hand,
+     * this should be a pretty rare occurrence and so I'll save space and hassle
+     * by just locating the events here by searching through the active events
+     * list */
+    if (pending_response == NSOCK_PENDING_ERROR)
+      fatal("nsock_iod_delete called with argument NSOCK_PENDING_ERROR on a nsock_iod that has %d pending event(s) associated with it", nsi->events_pending);
+
+    assert(pending_response == NSOCK_PENDING_NOTIFY || pending_response == NSOCK_PENDING_SILENT);
+
+    evlist_ar[0] = nsi->first_connect;
+    evlist_ar[1] = nsi->first_read;
+    evlist_ar[2] = nsi->first_write;
+#if HAVE_PCAP
+    evlist_ar[3] = nsi->first_pcap_read;
+#endif
+
+    corresp_list[0] = &nsi->nsp->connect_events;
+    corresp_list[1] = &nsi->nsp->read_events;
+    corresp_list[2] = &nsi->nsp->write_events;
+#if HAVE_PCAP
+    corresp_list[3] = &nsi->nsp->pcap_read_events;
+#endif
+
+    for (i = 0; i < NUM_EVT_TYPES && nsi->events_pending > 0; i++) {
+      for (current = evlist_ar[i]; current != NULL; current = next) {
+        struct nevent *nse;
+
+        next = gh_lnode_next(current);
+        nse = lnode_nevent(current);
+
+        /* we're done with this list of events for the current IOD */
+        if (nse->iod != nsi)
+          break;
+
+        nevent_delete(nsi->nsp, nse, corresp_list[i], current, pending_response == NSOCK_PENDING_NOTIFY);
+      }
+    }
+  }
+
+  if (nsi->events_pending != 0)
+    fatal("Trying to delete NSI, but could not find %d of the purportedly pending events on that IOD.\n", nsi->events_pending);
+
+  /* Make sure we no longer select on this socket, in case the socket counts
+   * weren't already decremented to zero. */
+  if (nsi->sd >= 0)
+    socket_count_zero(nsi, nsi->nsp);
+
+  free(nsi->hostname);
+
+#if HAVE_OPENSSL
+  /* Close any SSL resources */
+  if (nsi->ssl) {
+    /* No longer free session because copy nsi stores is not reference counted */
+#if 0
+    if (nsi->ssl_session)
+    SSL_SESSION_free(nsi->ssl_session);
+    nsi->ssl_session = NULL;
+#endif
+
+    if (SSL_shutdown(nsi->ssl) == -1) {
+      nsock_log_info("nsock_iod_delete: SSL shutdown failed (%s) on NSI %li",
+                     ERR_reason_error_string(SSL_get_error(nsi->ssl, -1)), nsi->id);
+    }
+
+    /* I don't really care if the SSL_shutdown() succeeded politely. I could
+     * make the SD blocking temporarily for this, but I'm hoping it will succeed
+     * 95% of the time because we can usually write to a socket. */
+    SSL_free(nsi->ssl);
+    nsi->ssl = NULL;
+  }
+#endif
+
+  if (nsi->sd >= 0 && nsi->sd != STDIN_FILENO) {
+    close(nsi->sd);
+    nsi->sd = -1;
+  }
+
+  nsi->state = NSIOD_STATE_DELETED;
+  nsi->userdata = NULL;
+
+  if (nsi->ipoptslen)
+    free(nsi->ipopts);
+
+#if HAVE_PCAP
+  if (nsi->pcap){
+    mspcap *mp = (mspcap *)nsi->pcap;
+
+    if (mp->pt){
+      pcap_close(mp->pt);
+      mp->pt = NULL;
+    }
+    if (mp->pcap_desc) {
+      /* pcap_close() will close the associated pcap descriptor */
+      mp->pcap_desc = -1;
+    }
+    if (mp->pcap_device) {
+      free(mp->pcap_device);
+      mp->pcap_device = NULL;
+    }
+    free(mp);
+    nsi->pcap = NULL;
+  }
+#endif
+
+  if (nsi->px_ctx)
+    proxy_chain_context_delete(nsi->px_ctx);
+}
+
+/* Returns the ID of an nsock_iod . This ID is always unique amongst ids for a
+ * given nspool (unless you blow through billions of them). */
+unsigned long nsock_iod_id(nsock_iod nsockiod) {
+  assert(nsockiod);
+  return ((struct niod *)nsockiod)->id;
+}
+
+/* Returns the SSL object inside an nsock_iod, or NULL if unset. */
+nsock_ssl nsock_iod_get_ssl(nsock_iod iod) {
+#if HAVE_OPENSSL
+  return ((struct niod *)iod)->ssl;
+#else
+  return NULL;
+#endif
+}
+
+/* Returns the SSL_SESSION of an nsock_iod.
+ * Increments its usage count if inc_ref is not zero. */
+nsock_ssl_session nsock_iod_get_ssl_session(nsock_iod iod, int inc_ref) {
+#if HAVE_OPENSSL
+  if (inc_ref)
+    return SSL_get1_session(((struct niod *)iod)->ssl);
+  else
+    return SSL_get0_session(((struct niod *)iod)->ssl);
+#else
+  return NULL;
+#endif
+}
+
+/* sets the ssl session of an nsock_iod, increments usage count. The session
+ * should not have been set yet (as no freeing is done) */
+#if HAVE_OPENSSL
+void nsi_set_ssl_session(struct niod *iod, SSL_SESSION *sessid) {
+  if (sessid) {
+    iod->ssl_session = sessid;
+    /* No reference counting for the copy stored briefly in nsiod */
+  }
+}
+#endif
+
+/* Sometimes it is useful to store a pointer to information inside the struct niod so
+ * you can retrieve it during a callback. */
+void nsock_iod_set_udata(nsock_iod iod, void *udata) {
+  assert(iod);
+  ((struct niod *)iod)->userdata = udata;
+}
+
+/* And the function above wouldn't make much sense if we didn't have a way to
+ * retrieve that data... */
+void *nsock_iod_get_udata(nsock_iod iod) {
+  assert(iod);
+  return ((struct niod *)iod)->userdata;
+}
+
+/* Returns 1 if an NSI is communicating via SSL, 0 otherwise. */
+int nsock_iod_check_ssl(nsock_iod iod) {
+  return (((struct niod *)iod)->ssl) ? 1 : 0;
+}
+
+/* Returns the remote peer port (or -1 if unavailable).  Note the return value
+ * is a whole int so that -1 can be distinguished from 65535.  Port is returned
+ * in host byte order. */
+int nsock_iod_get_peerport(nsock_iod iod) {
+  struct niod *nsi = (struct niod *)iod;
+  int fam;
+
+  if (nsi->peerlen <= 0)
+    return -1;
+
+  fam = ((struct sockaddr_in *)&nsi->peer)->sin_family;
+
+  if (fam == AF_INET)
+    return ntohs(((struct sockaddr_in *)&nsi->peer)->sin_port);
+#if HAVE_IPV6
+  else if (fam == AF_INET6)
+    return ntohs(((struct sockaddr_in6 *)&nsi->peer)->sin6_port);
+#endif
+
+  return -1;
+}
+
+/* Sets the local address to bind to before connect() */
+int nsock_iod_set_localaddr(nsock_iod iod, struct sockaddr_storage *ss,
+                            size_t sslen) {
+  struct niod *nsi = (struct niod *)iod;
+
+  assert(nsi);
+
+  if (sslen > sizeof(nsi->local))
+    return -1;
+
+  memcpy(&nsi->local, ss, sslen);
+  nsi->locallen = sslen;
+  return 0;
+}
+
+/* Sets IPv4 options to apply before connect(). It makes a copy of the options,
+ * so you can free() yours if necessary. This copy is freed when the iod is
+ * destroyed. */
+int nsock_iod_set_ipoptions(nsock_iod iod, void *opts, size_t optslen) {
+  struct niod *nsi = (struct niod *)iod;
+
+  assert(nsi);
+
+  if (optslen > 44)
+    return -1;
+
+  nsi->ipopts = safe_malloc(optslen);
+  memcpy(nsi->ipopts, opts, optslen);
+  nsi->ipoptslen = optslen;
+  return 0;
+}
+
+/* I didn't want to do this.  Its an ugly hack, but I suspect it will be
+ * necessary.  I certainly can't reproduce in nsock EVERYTHING you might want
+ * to do with a socket.  So I'm offering you this function to obtain the socket
+ * descriptor which is (usually) wrapped in a nsock_iod).  You can do
+ * "reasonable" things with it, like setting socket receive buffers.  But don't
+ * create havok by closing the descriptor!  If the descriptor you get back is
+ * -1, the iod does not currently possess a valid descriptor */
+int nsock_iod_get_sd(nsock_iod iod) {
+  struct niod *nsi = (struct niod *)iod;
+
+  assert(nsi);
+
+#if HAVE_PCAP
+  if (nsi->pcap)
+    return ((mspcap *)nsi->pcap)->pcap_desc;
+  else
+#endif
+    return nsi->sd;
+}
+
+unsigned long nsock_iod_get_read_count(nsock_iod iod){
+  assert(iod);
+  return ((struct niod *)iod)->read_count;
+}
+
+unsigned long nsock_iod_get_write_count(nsock_iod iod){
+  assert(iod);
+  return ((struct niod *)iod)->write_count;
+}
+
+int nsock_iod_set_hostname(nsock_iod iod, const char *hostname) {
+  struct niod *nsi = (struct niod *)iod;
+
+  if (nsi->hostname != NULL)
+    free(nsi->hostname);
+
+  nsi->hostname = strdup(hostname);
+  if (nsi->hostname == NULL)
+    return -1;
+
+  return 0;
+}
+
diff --git a/nsock/src/nsock_log.c b/nsock/src/nsock_log.c
new file mode 100644
index 0000000..5ef033c
--- /dev/null
+++ b/nsock/src/nsock_log.c
@@ -0,0 +1,116 @@
+/***************************************************************************
+ * nsock_log.c -- nsock logging infrastructure.                            *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+
+#define _GNU_SOURCE
+#include <stdio.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+static void nsock_stderr_logger(const struct nsock_log_rec *rec);
+
+extern struct timeval nsock_tod;
+
+nsock_loglevel_t    NsockLogLevel = NSOCK_LOG_ERROR;
+nsock_logger_t      NsockLogger   = nsock_stderr_logger;
+
+
+void nsock_set_log_function(nsock_logger_t logger) {
+  if (logger != NULL)
+    NsockLogger = logger;
+  else
+    NsockLogger = nsock_stderr_logger;
+
+  nsock_log_debug("Registered external logging function: %p", NsockLogger);
+}
+
+nsock_loglevel_t nsock_get_loglevel(void) {
+  return NsockLogLevel;
+}
+
+void nsock_set_loglevel(nsock_loglevel_t loglevel) {
+  NsockLogLevel = loglevel;
+  nsock_log_debug("Set log level to %s", nsock_loglevel2str(loglevel));
+}
+
+void nsock_stderr_logger(const struct nsock_log_rec *rec) {
+  fprintf(stderr, "libnsock %s(): %s\n", rec->func, rec->msg);
+}
+
+void __nsock_log_internal(nsock_loglevel_t loglevel, const char *file, int line,
+                          const char *func, const char *format, ...) {
+  struct nsock_log_rec rec;
+  va_list args;
+  int rc;
+
+  va_start(args, format);
+
+  rec.level = loglevel;
+  rec.time = nsock_tod;
+  rec.file = file;
+  rec.line = line;
+  rec.func = func;
+
+  rc = vasprintf(&rec.msg, format, args);
+  if (rc >= 0) {
+    NsockLogger(&rec);
+    free(rec.msg);
+  }
+  va_end(args);
+}
+
diff --git a/nsock/src/nsock_log.h b/nsock/src/nsock_log.h
new file mode 100644
index 0000000..49b0dea
--- /dev/null
+++ b/nsock/src/nsock_log.h
@@ -0,0 +1,115 @@
+/***************************************************************************
+ * nsock_log.c -- nsock logging infrastructure.                            *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+
+#ifndef NSOCK_LOG_H
+#define NSOCK_LOG_H
+
+#include "nsock.h"
+
+extern nsock_loglevel_t NsockLogLevel;
+extern nsock_logger_t   NsockLogger;
+
+
+#define NSOCK_LOG_WRAP(lvl, ...)  \
+    do { \
+        if (NsockLogger && (lvl) >= NsockLogLevel) { \
+            __nsock_log_internal((lvl), __FILE__, __LINE__, __func__, __VA_ARGS__); \
+        } \
+    } while (0)
+
+
+static inline const char *nsock_loglevel2str(nsock_loglevel_t level)
+{
+  switch (level) {
+    case NSOCK_LOG_DBG_ALL:
+      return "FULL DEBUG";
+    case NSOCK_LOG_DBG:
+      return "DEBUG";
+    case NSOCK_LOG_INFO:
+      return "INFO";
+    case NSOCK_LOG_ERROR:
+      return "ERROR";
+    default:
+      return "???";
+  }
+}
+
+/* -- Internal logging macros -- */
+/**
+ * Most detailed debug messages, like allocating or moving objects.
+ */
+#define nsock_log_debug_all(...) NSOCK_LOG_WRAP(NSOCK_LOG_DBG_ALL, __VA_ARGS__)
+
+/**
+ * Detailed debug messages, describing internal operations.
+ */
+#define nsock_log_debug(...)     NSOCK_LOG_WRAP(NSOCK_LOG_DBG, __VA_ARGS__)
+
+/**
+ * High level debug messages, describing top level operations and external
+ * requests.
+ */
+#define nsock_log_info(...)      NSOCK_LOG_WRAP(NSOCK_LOG_INFO, __VA_ARGS__)
+
+/**
+ * Error messages.
+ */
+#define nsock_log_error(...)     NSOCK_LOG_WRAP(NSOCK_LOG_ERROR, __VA_ARGS__)
+
+
+void __nsock_log_internal(nsock_loglevel_t loglevel, const char *file, int line,
+                          const char *func, const char *format, ...)
+                          __attribute__((format (printf, 5, 6)));
+
+#endif /* NSOCK_LOG_H */
+
diff --git a/nsock/src/nsock_pcap.c b/nsock/src/nsock_pcap.c
new file mode 100644
index 0000000..c9e43d4
--- /dev/null
+++ b/nsock/src/nsock_pcap.c
@@ -0,0 +1,516 @@
+/***************************************************************************
+ * nsock_pcap.c -- This contains pcap operations functions from            *
+ * the nsock parallel socket event library                                 *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+#include <limits.h>
+#if HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+#if HAVE_NET_BPF_H
+#ifdef _AIX
+/* Prevent bpf.h from redefining the DLT_ values to their IFT_ values. (See
+ * similar comment in libpcap/pcap-bpf.c.) */
+#undef _AIX
+#include <net/bpf.h>
+#define _AIX
+#else
+#include <net/bpf.h>
+#endif
+#endif
+
+#include "nsock_pcap.h"
+
+extern struct timeval nsock_tod;
+
+#if HAVE_PCAP
+
+#ifndef PCAP_NETMASK_UNKNOWN
+/* libpcap before 1.1.1 (e.g. WinPcap) doesn't handle this specially, so just use 0 netmask */
+#define PCAP_NETMASK_UNKNOWN 0
+#endif
+
+#define PCAP_OPEN_MAX_RETRIES   3
+
+#define PCAP_FAILURE_EXPL_MESSAGE  \
+    "There are several possible reasons for this, " \
+    "depending on your operating system:\n" \
+    "LINUX: If you are getting Socket type not supported, " \
+    "try modprobe af_packet or recompile your kernel with PACKET enabled.\n" \
+    "*BSD:  If you are getting device not configured, you need to recompile " \
+    "your kernel with Berkeley Packet Filter support." \
+    "If you are getting No such file or directory, try creating the device " \
+    "(eg cd /dev; MAKEDEV <device>; or use mknod).\n" \
+    "*WINDOWS:  Nmap only supports ethernet interfaces on Windows for most " \
+    "operations because Microsoft disabled raw sockets as of Windows XP SP2. " \
+    "Depending on the reason for this error, it is possible that the " \
+    "--unprivileged command-line argument will help.\n" \
+    "SOLARIS:  If you are trying to scan localhost and getting "\
+    "'/dev/lo0: No such file or directory', complain to Sun.  "\
+    "I don't think Solaris can support advanced localhost scans.  "\
+    "You can probably use \"-PN -sT localhost\" though.\n\n"
+
+
+static int nsock_pcap_set_filter(struct npool *nsp, pcap_t *pt, const char *device,
+                                 const char *bpf) {
+  struct bpf_program fcode;
+  int rc;
+
+  rc = pcap_compile(pt, &fcode, (char *)bpf, 1, PCAP_NETMASK_UNKNOWN);
+  if (rc) {
+    nsock_log_error("Error compiling pcap filter: %s", pcap_geterr(pt));
+    return rc;
+  }
+
+  rc = pcap_setfilter(pt, &fcode);
+  if (rc) {
+    nsock_log_error("Failed to set the pcap filter: %s", pcap_geterr(pt));
+    return rc;
+  }
+
+  pcap_freecode(&fcode);
+  return 0;
+}
+
+static int nsock_pcap_get_l3_offset(pcap_t *pt, int *dl) {
+  int datalink;
+  unsigned int offset = 0;
+
+  /* New packet capture device, need to recompute offset */
+  if ((datalink = pcap_datalink(pt)) < 0)
+    fatal("Cannot obtain datalink information: %s", pcap_geterr(pt));
+
+  /* XXX NOTE:
+   * if a new offset ever exceeds the current max (24),
+   * adjust MAX_LINK_HEADERSZ in libnetutil/netutil.h
+   */
+  switch (datalink) {
+    case DLT_EN10MB: offset = 14; break;
+    case DLT_IEEE802: offset = 22; break;
+    #ifdef __amigaos__
+    case DLT_MIAMI: offset = 16; break;
+    #endif
+    #ifdef DLT_LOOP
+    case DLT_LOOP:
+    #endif
+    case DLT_NULL: offset = 4; break;
+
+    case DLT_SLIP:
+    #ifdef DLT_SLIP_BSDOS
+    case DLT_SLIP_BSDOS:
+    #endif
+    #if (FREEBSD || OPENBSD || NETBSD || BSDI || MACOSX)
+    offset = 16;break;
+    #else
+    offset = 24;break; /* Anyone use this??? */
+    #endif
+
+    case DLT_PPP:
+    #ifdef DLT_PPP_BSDOS
+    case DLT_PPP_BSDOS:
+    #endif
+    #ifdef DLT_PPP_SERIAL
+    case DLT_PPP_SERIAL:
+    #endif
+    #ifdef DLT_PPP_ETHER
+    case DLT_PPP_ETHER:
+    #endif
+    #if (FREEBSD || OPENBSD || NETBSD || BSDI || MACOSX)
+    offset = 4;break;
+    #else
+      #ifdef SOLARIS
+        offset = 8;break;
+      #else
+        offset = 24;break; /* Anyone use this? */
+      #endif /* ifdef solaris */
+    #endif /* if freebsd || openbsd || netbsd || bsdi */
+    #ifdef DLT_RAW
+    case DLT_RAW: offset = 0; break;
+    #endif /* DLT_RAW */
+    case DLT_FDDI: offset = 21; break;
+    #ifdef DLT_ENC
+    case DLT_ENC: offset = 12; break;
+    #endif /* DLT_ENC */
+    #ifdef DLT_LINUX_SLL
+    case DLT_LINUX_SLL: offset = 16; break;
+    #endif
+    #ifdef DLT_IPNET
+    case DLT_IPNET: offset = 24; break;
+    #endif /* DLT_IPNET */
+
+    default: /* Sorry, link type is unknown. */
+      fatal("Unknown datalink type %d.\n", datalink);
+  }
+  if (dl)
+    *dl = datalink;
+  return (offset);
+}
+
+/* Convert new nsiod to pcap descriptor. Other parameters have
+ * the same meaning as for pcap_open_live in pcap(3).
+ *   device   : pcap-style device name
+ *   snaplen  : size of packet to be copied to handler
+ *   promisc  : whether to open device in promiscuous mode
+ *   bpf_fmt   : berkeley filter
+ * return value: NULL if everything was okay, or error string
+ * if error occurred. */
+int nsock_pcap_open(nsock_pool nsp, nsock_iod nsiod, const char *pcap_device,
+                    int snaplen, int promisc, const char *bpf_fmt, ...) {
+  struct niod *nsi = (struct niod *)nsiod;
+  struct npool *ms = (struct npool *)nsp;
+  mspcap *mp = (mspcap *)nsi->pcap;
+  char errbuf[PCAP_ERRBUF_SIZE];
+  char bpf[4096];
+  va_list ap;
+  int failed, datalink;
+  int rc;
+
+#ifdef PCAP_CAN_DO_SELECT
+#if PCAP_BSD_SELECT_HACK
+  /* MacOsX reports error if to_ms is too big (like INT_MAX) with error
+   * FAILED. Reported error: BIOCSRTIMEOUT: Invalid argument
+   * INT_MAX/6 (=357913941) seems to be working... */
+  int to_ms = 357913941;
+#else
+  int to_ms = 200;
+#endif /* PCAP_BSD_SELECT_HACK */
+
+#else
+  int to_ms = 1;
+#endif
+
+  gettimeofday(&nsock_tod, NULL);
+
+  if (mp) {
+    nsock_log_error("This nsi already has pcap device opened");
+    return -1;
+  }
+
+  mp = (mspcap *)safe_zalloc(sizeof(mspcap));
+  nsi->pcap = (void *)mp;
+
+  va_start(ap, bpf_fmt);
+  rc = Vsnprintf(bpf, sizeof(bpf), bpf_fmt, ap);
+  va_end(ap);
+
+  if (rc >= (int)sizeof(bpf)) {
+    nsock_log_error("Too-large bpf filter argument");
+    return -1;
+  }
+
+  nsock_log_info("PCAP requested on device '%s' with berkeley filter '%s' "
+                 "(promisc=%i snaplen=%i to_ms=%i) (IOD #%li)",
+                 pcap_device,bpf, promisc, snaplen, to_ms, nsi->id);
+
+#ifdef __amigaos__
+  // Amiga doesn't have pcap_create
+  // TODO: Does Nmap still work on Amiga?
+  mp->pt = pcap_open_live(pcap_device, snaplen, promisc, to_ms, errbuf);
+  if (!mp->pt) {
+    nsock_log_error("pcap_open_live(%s, %d, %d, %d) failed with error: %s",
+        pcap_device, snaplen, promisc, to_ms, errbuf);
+    nsock_log_error(PCAP_FAILURE_EXPL_MESSAGE);
+    nsock_log_error("Can't open pcap! Are you root?");
+    return -1;
+  }
+#else
+  mp->pt = pcap_create(pcap_device, errbuf);
+  if (!mp->pt) {
+    nsock_log_error("pcap_create(%s) failed with error: %s", pcap_device, errbuf);
+    nsock_log_error(PCAP_FAILURE_EXPL_MESSAGE);
+    nsock_log_error("Can't open pcap! Are you root?");
+    return -1;
+  }
+
+#define MY_PCAP_SET(func, p_t, val) do {\
+  failed = func(p_t, val);\
+  if (failed) {\
+    nsock_log_error(#func "(%d) FAILED: %d.", val, failed);\
+    pcap_close(p_t);\
+    return -1;\
+  }\
+} while(0);
+
+  MY_PCAP_SET(pcap_set_snaplen, mp->pt, snaplen);
+  MY_PCAP_SET(pcap_set_promisc, mp->pt, promisc);
+  MY_PCAP_SET(pcap_set_timeout, mp->pt, to_ms);
+#ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
+  MY_PCAP_SET(pcap_set_immediate_mode, mp->pt, 1);
+#endif
+
+  failed = pcap_activate(mp->pt);
+  if (failed < 0) {
+    // PCAP error
+    nsock_log_error("pcap_activate(%s) FAILED: %s.", pcap_device, pcap_geterr(mp->pt));
+    pcap_close(mp->pt);
+    mp->pt = NULL;
+    return -1;
+  }
+  else if (failed > 0) {
+    // PCAP warning, report but assume it'll still work
+    nsock_log_error("pcap_activate(%s) WARNING: %s.", pcap_device, pcap_geterr(mp->pt));
+  }
+#endif /* not __amigaos__ */
+
+  rc = nsock_pcap_set_filter(ms, mp->pt, pcap_device, bpf);
+  if (rc)
+    return rc;
+
+  mp->l3_offset = nsock_pcap_get_l3_offset(mp->pt, &datalink);
+  mp->snaplen = snaplen;
+  mp->datalink = datalink;
+  mp->pcap_device = strdup(pcap_device);
+#ifdef PCAP_CAN_DO_SELECT
+  mp->pcap_desc = pcap_get_selectable_fd(mp->pt);
+#else
+  mp->pcap_desc = -1;
+#endif
+  mp->readsd_count = 0;
+
+#ifndef HAVE_PCAP_SET_IMMEDIATE_MODE
+  /* This is already handled by pcap_set_immediate_mode if available */
+#ifdef BIOCIMMEDIATE
+  /* Without setting this ioctl, some systems (BSDs, though it depends on the
+   * release) will buffer packets in non-blocking mode and only return them in a
+   * bunch when the buffer is full. Setting the ioctl makes each one be
+   * delivered immediately. This is how Linux works by default. See the comments
+   * surrounding the setting of BIOCIMMEDIATE in libpcap/pcap-bpf.c. */
+  if (mp->pcap_desc != -1) {
+    int immediate = 1;
+
+    if (ioctl(mp->pcap_desc, BIOCIMMEDIATE, &immediate) < 0)
+      fatal("Cannot set BIOCIMMEDIATE on pcap descriptor");
+  }
+#elif defined WIN32
+  /* We want any responses back ASAP */
+  pcap_setmintocopy(mp->pt, 0);
+#endif
+#endif
+
+  /* Set device non-blocking */
+  rc = pcap_setnonblock(mp->pt, 1, errbuf);
+  if (rc) {
+
+    /* I can't do select() on pcap!
+     * blocking + no_select is fatal */
+#ifndef PCAP_BSD_SELECT_HACK
+    if (mp->pcap_desc < 0)
+#endif
+    {
+      nsock_log_error("Failed to set pcap descriptor on device %s "
+                      "to nonblocking mode: %s", pcap_device, errbuf);
+      return -1;
+    }
+    /* in other case, we can accept blocking pcap */
+    nsock_log_info("Failed to set pcap descriptor on device %s "
+                   "to nonblocking state: %s", pcap_device, errbuf);
+  }
+
+  if (NsockLogLevel <= NSOCK_LOG_INFO) {
+    #if PCAP_BSD_SELECT_HACK
+      int bsd_select_hack = 1;
+    #else
+      int bsd_select_hack = 0;
+    #endif
+
+    #if PCAP_RECV_TIMEVAL_VALID
+      int recv_timeval_valid = 1;
+    #else
+      int recv_timeval_valid = 0;
+    #endif
+
+    nsock_log_info("PCAP created successfully on device '%s' "
+                   "(pcap_desc=%i bsd_hack=%i to_valid=%i l3_offset=%i) (IOD #%li)",
+                   pcap_device, mp->pcap_desc, bsd_select_hack,
+                   recv_timeval_valid, mp->l3_offset, nsi->id);
+  }
+  return 0;
+}
+
+/* Requests exactly one packet to be captured. */
+nsock_event_id nsock_pcap_read_packet(nsock_pool nsp, nsock_iod nsiod,
+                                      nsock_ev_handler handler,
+                                      int timeout_msecs, void *userdata) {
+  struct niod *nsi = (struct niod *)nsiod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+
+  nse = event_new(ms, NSE_TYPE_PCAP_READ, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("Pcap read request from IOD #%li  EID %li", nsi->id, nse->id);
+
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
+/* Remember that pcap descriptor is in nonblocking state. */
+int do_actual_pcap_read(struct nevent *nse) {
+  mspcap *mp = (mspcap *)nse->iod->pcap;
+  nsock_pcap npp;
+  nsock_pcap *n;
+  struct pcap_pkthdr *pkt_header;
+  const unsigned char *pkt_data = NULL;
+  int rc;
+
+  memset(&npp, 0, sizeof(nsock_pcap));
+
+  nsock_log_debug_all("PCAP %s TEST (IOD #%li) (EID #%li)",
+                      __func__, nse->iod->id, nse->id);
+
+  assert(fs_length(&(nse->iobuf)) == 0);
+
+  rc = pcap_next_ex(mp->pt, &pkt_header, &pkt_data);
+  switch (rc) {
+    case 1: /* read good packet  */
+#ifdef PCAP_RECV_TIMEVAL_VALID
+      npp.ts     = pkt_header->ts;
+#else
+      /* On these platforms time received from pcap is invalid.
+       * It's better to set current time */
+      memcpy(&npp.ts, nsock_gettimeofday(), sizeof(struct timeval));
+#endif
+      npp.len    = pkt_header->len;
+      npp.caplen = pkt_header->caplen;
+      npp.packet = pkt_data;
+
+      fs_cat(&(nse->iobuf), (char *)&npp, sizeof(npp));
+      fs_cat(&(nse->iobuf), (char *)pkt_data, npp.caplen);
+      n = (nsock_pcap *)fs_str(&(nse->iobuf));
+      n->packet = (unsigned char *)fs_str(&(nse->iobuf)) + sizeof(npp);
+
+      nsock_log_debug_all("PCAP %s READ (IOD #%li) (EID #%li) size=%i",
+                          __func__, nse->iod->id, nse->id, pkt_header->caplen);
+      rc = 1;
+      break;
+
+    case 0: /* timeout */
+      rc = 0;
+      break;
+
+    case -1: /* error */
+      fatal("pcap_next_ex() fatal error while reading from pcap: %s\n",
+            pcap_geterr(mp->pt));
+      break;
+
+    case -2: /* no more packets in savefile (if reading from one) */
+    default:
+      fatal("Unexpected return code from pcap_next_ex! (%d)\n", rc);
+  }
+
+  return rc;
+}
+
+void nse_readpcap(nsock_event nsev, const unsigned char **l2_data, size_t *l2_len,
+                  const unsigned char **l3_data, size_t *l3_len,
+                  size_t *packet_len, struct timeval *ts) {
+  struct nevent *nse = (struct nevent *)nsev;
+  struct niod  *iod = nse->iod;
+  mspcap *mp = (mspcap *)iod->pcap;
+  nsock_pcap *n;
+  size_t l2l;
+  size_t l3l;
+
+  n = (nsock_pcap *)fs_str(&(nse->iobuf));
+  if (fs_length(&(nse->iobuf)) < sizeof(nsock_pcap)) {
+    if (l2_data)
+      *l2_data = NULL;
+    if (l2_len)
+      *l2_len = 0;
+    if (l3_data)
+      *l3_data = NULL;
+    if (l3_len)
+      *l3_len = 0;
+    if (packet_len)
+      *packet_len = 0;
+    return;
+  }
+
+  l2l = MIN(mp->l3_offset, n->caplen);
+  l3l = MAX(0, n->caplen-mp->l3_offset);
+
+  if (l2_data)
+    *l2_data = n->packet;
+  if (l2_len)
+    *l2_len = l2l;
+  if (l3_data)
+    *l3_data = (l3l > 0) ? n->packet+l2l : NULL;
+  if (l3_len)
+    *l3_len = l3l;
+  if (packet_len)
+    *packet_len = n->len;
+  if (ts)
+    *ts = n->ts;
+  return;
+}
+
+int nsock_iod_linktype(nsock_iod iod) {
+  struct niod *nsi = (struct niod *)iod;
+  mspcap *mp = (mspcap *)nsi->pcap;
+
+  assert(mp);
+  return (mp->datalink);
+}
+
+int nsock_iod_is_pcap(nsock_iod iod) {
+  struct niod *nsi = (struct niod *)iod;
+  mspcap *mp = (mspcap *)nsi->pcap;
+
+  return (mp != NULL);
+}
+
+#endif /* HAVE_PCAP */
+
diff --git a/nsock/src/nsock_pcap.h b/nsock/src/nsock_pcap.h
new file mode 100644
index 0000000..ca667db
--- /dev/null
+++ b/nsock/src/nsock_pcap.h
@@ -0,0 +1,152 @@
+/***************************************************************************
+ * nsock_pcap.h -- Header for pcap operations functions from               *
+ * the nsock parallel socket event library                                 *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef NSOCK_PCAP_H
+#define NSOCK_PCAP_H
+
+#include "nsock_internal.h"
+#ifdef HAVE_PCAP
+
+#include "pcap.h"
+
+#include <string.h>
+#include <stdarg.h>
+
+/*
+ * There are three possible ways to read packets from pcap descriptor:
+ *  - select() on descriptor:
+ *      this one is of course the best, but there are systems that
+ *      don't support this like WIN32. This works perfectly for Linux.
+ *
+ *  - select() + some hacks:
+ *      this one is hack for older bsd systems,
+ *      Descriptor *must* be set in nonblocking mode.
+ *
+ *   - never do select():
+ *      this one is for WIN32 and other systems that return descriptor -1
+ *      from pcap_get_selectable_fd().
+ *      In this case descriptor *must* be set in nonblocking mode.
+ *      If that fails than we can't do any sniffing from that box.
+ *
+ * In any case we try to set descriptor to non-blocking mode.
+ */
+
+/* Returns whether the system supports pcap_get_selectable_fd() properly */
+#if !defined(WIN32) && !defined(SOLARIS_BPF_PCAP_CAPTURE)
+#define PCAP_CAN_DO_SELECT 1
+#endif
+
+/* In some systems (like Windows), the pcap descriptor is not selectable.
+ * Therefore, we cannot just select() on it and expect it to wake us up and
+ * deliver a packet, but we need to poll it continuously. This define sets the
+ * frequency, in milliseconds, at which the pcap handle is polled to determine
+ * if there are any captured packets.  Note that this is only used when
+ * PCAP_CAN_DO_SELECT is not defined and therefore it has no effect on systems
+ * like Linux.
+ */
+#define PCAP_POLL_INTERVAL 2
+
+/* Note that on most versions of most BSDs (including Mac OS X) select() and
+ * poll() do not work correctly on BPF devices; pcap_get_selectable_fd() will
+ * return a file descriptor on most of those versions (the exceptions being
+ * FreeBSD 4.3 and 4.4), a simple select() or poll() will not return even after
+ * a timeout specified in pcap_open_live() expires. To work around this, an
+ * application that uses select() or poll() to wait for packets to arrive must
+ * put the pcap_t in non-blocking mode, and must arrange that the select() or
+ * poll() have a timeout less than or equal to the timeout specified in
+ * pcap_open_live(), and must try to read packets after that timeout expires,
+ * regardless of whether select() or poll() indicated that the file descriptor
+ * for the pcap_t is ready to be read or not. (That workaround will not work in
+ * FreeBSD 4.3 and later; however, in FreeBSD 4.6 and later, select() and poll()
+ * work correctly on BPF devices, so the workaround isn't necessary, although it
+ * does no harm.)
+ */
+#if defined(MACOSX) || defined(FREEBSD) || defined(OPENBSD)
+/* Well, now select() is not receiving any pcap events on MACOSX, but maybe it
+ * will someday :) in both cases. It never hurts to enable this feature. It just
+ * has performance penalty. */
+#define PCAP_BSD_SELECT_HACK 1
+#endif
+
+/* Returns whether the packet receive time value obtained from libpcap
+ * (and thus by readip_pcap()) should be considered valid.  When
+ * invalid (Windows and Amiga), readip_pcap returns the time you called it. */
+#if !defined(WIN32) && !defined(__amigaos__)
+#define PCAP_RECV_TIMEVAL_VALID 1
+#endif
+
+
+typedef struct{
+  pcap_t *pt;
+  int pcap_desc;
+  /* Like the corresponding member in iod, when this reaches 0 we stop
+   * watching the socket for readability. */
+  int readsd_count;
+  int datalink;
+  int l3_offset;
+  int snaplen;
+  char *pcap_device;
+} mspcap;
+
+typedef struct{
+  struct timeval ts;
+  int caplen;
+  int len;
+  const unsigned char *packet;  /* caplen bytes */
+} nsock_pcap;
+
+int do_actual_pcap_read(struct nevent *nse);
+
+#endif /* HAVE_PCAP */
+#endif /* NSOCK_PCAP_H */
+
diff --git a/nsock/src/nsock_pool.c b/nsock/src/nsock_pool.c
new file mode 100644
index 0000000..485a68b
--- /dev/null
+++ b/nsock/src/nsock_pool.c
@@ -0,0 +1,308 @@
+/***************************************************************************
+ * nsock_pool.c -- This contains the functions that deal with creating,    *
+ * destroying, and otherwise manipulating nsock_pools (and their internal  *
+ * struct npool representation).  An nsock_pool aggregates and manages events    *
+ * and i/o descriptors                                                     *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include "gh_list.h"
+#include "netutils.h"
+
+#include <string.h>
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <signal.h>
+
+#if HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+
+extern struct timeval nsock_tod;
+
+/* To use this library, the first thing they must do is create a pool
+ * so we do the initialization during the first pool creation */
+static int nsocklib_initialized = 0;
+
+
+/* defined in nsock_engines.h */
+struct io_engine *get_io_engine(void);
+
+/* ---- INTERNAL FUNCTIONS PROTOTYPES ---- */
+static void nsock_library_initialize(void);
+/* --------------------------------------- */
+
+
+/* This next function returns the errno style error code -- which is only
+ * valid if the status NSOCK_LOOP_ERROR was returned by nsock_loop() */
+int nsock_pool_get_error(nsock_pool nsp) {
+  struct npool *mt = (struct npool *)nsp;
+  return mt->errnum;
+}
+
+/* Sometimes it is useful to store a pointer to information inside
+ * the NSP so you can retrieve it during a callback. */
+void nsock_pool_set_udata(nsock_pool nsp, void *data) {
+  struct npool *mt = (struct npool *)nsp;
+  mt->userdata = data;
+}
+
+/* And the define above wouldn't make much sense if we didn't have a way
+ * to retrieve that data ... */
+void *nsock_pool_get_udata(nsock_pool nsp) {
+  struct npool *mt = (struct npool *)nsp;
+  return mt->userdata;
+}
+
+/* Turns on or off broadcast support on new sockets. Default is off (0, false)
+ * set in nsock_pool_new(). Any non-zero (true) value sets SO_BROADCAST on all new
+ * sockets (value of optval will be used directly in the setsockopt() call */
+void nsock_pool_set_broadcast(nsock_pool nsp, int optval) {
+  struct npool *mt = (struct npool *)nsp;
+  mt->broadcast = optval;
+}
+
+/* Sets the name of the interface for new sockets to bind to. */
+void nsock_pool_set_device(nsock_pool nsp, const char *device) {
+  struct npool *mt = (struct npool *)nsp;
+  mt->device = device;
+}
+
+static int expirable_cmp(gh_hnode_t *n1, gh_hnode_t *n2) {
+  struct nevent *nse1;
+  struct nevent *nse2;
+
+  nse1 = container_of(n1, struct nevent, expire);
+  nse2 = container_of(n2, struct nevent, expire);
+
+  return (TIMEVAL_BEFORE(nse1->timeout, nse2->timeout)) ? 1 : 0;
+}
+
+/* And here is how you create an nsock_pool.  This allocates, initializes, and
+ * returns an nsock_pool event aggregator.  In the case of error, NULL will be
+ * returned.  If you do not wish to immediately associate any userdata, pass in
+ * NULL. */
+nsock_pool nsock_pool_new(void *userdata) {
+  struct npool *nsp;
+
+  /* initialize the library in not already done */
+  if (!nsocklib_initialized) {
+    nsock_library_initialize();
+    nsocklib_initialized = 1;
+  }
+
+  nsp = (struct npool *)safe_malloc(sizeof(*nsp));
+  memset(nsp, 0, sizeof(*nsp));
+
+  gettimeofday(&nsock_tod, NULL);
+
+  nsp->userdata = userdata;
+
+  nsp->engine = get_io_engine();
+  nsock_engine_init(nsp);
+
+  /* initialize IO events lists */
+  gh_list_init(&nsp->connect_events);
+  gh_list_init(&nsp->read_events);
+  gh_list_init(&nsp->write_events);
+#if HAVE_PCAP
+  gh_list_init(&nsp->pcap_read_events);
+#endif
+
+  /* initialize timer heap */
+  gh_heap_init(&nsp->expirables, expirable_cmp);
+
+  /* initialize the list of IODs */
+  gh_list_init(&nsp->active_iods);
+
+  /* initialize caches */
+  gh_list_init(&nsp->free_iods);
+  gh_list_init(&nsp->free_events);
+
+  nsp->next_event_serial = 1;
+
+  nsp->device = NULL;
+
+#if HAVE_OPENSSL
+  nsp->sslctx = NULL;
+  nsp->dtlsctx = NULL;
+#endif
+
+  nsp->px_chain = NULL;
+
+  return (nsock_pool)nsp;
+}
+
+/* If nsock_pool_new returned success, you must free the nsp when you are done with it
+ * to conserve memory (and in some cases, sockets).  After this call, nsp may no
+ * longer be used.  Any pending events are sent an NSE_STATUS_KILL callback and
+ * all outstanding iods are deleted. */
+void nsock_pool_delete(nsock_pool ms_pool) {
+  struct npool *nsp = (struct npool *)ms_pool;
+  struct nevent *nse;
+  struct niod *nsi;
+  int i;
+  gh_lnode_t *current, *next;
+  gh_list_t *event_lists[] = {
+    &nsp->connect_events,
+    &nsp->read_events,
+    &nsp->write_events,
+#if HAVE_PCAP
+    &nsp->pcap_read_events,
+#endif
+    NULL
+  };
+
+  assert(nsp);
+
+  /* First I go through all the events sending NSE_STATUS_KILL */
+  for (i = 0; event_lists[i] != NULL; i++) {
+    while (gh_list_count(event_lists[i]) > 0) {
+      gh_lnode_t *lnode = gh_list_pop(event_lists[i]);
+
+      assert(lnode);
+
+#if HAVE_PCAP
+      if (event_lists[i] == &nsp->pcap_read_events)
+        nse = lnode_nevent2(lnode);
+      else
+#endif
+        nse = lnode_nevent(lnode);
+
+      assert(nse);
+
+      nse->status = NSE_STATUS_KILL;
+      nsock_trace_handler_callback(nsp, nse);
+      nse->handler(nsp, nse, nse->userdata);
+
+      if (nse->iod) {
+        nse->iod->events_pending--;
+        assert(nse->iod->events_pending >= 0);
+      }
+      event_delete(nsp, nse);
+    }
+    gh_list_free(event_lists[i]);
+  }
+
+  /* Kill timers too, they're not in event lists */
+  while (gh_heap_count(&nsp->expirables) > 0) {
+    gh_hnode_t *hnode;
+
+    hnode = gh_heap_pop(&nsp->expirables);
+    nse = container_of(hnode, struct nevent, expire);
+
+    if (nse->type == NSE_TYPE_TIMER) {
+      nse->status = NSE_STATUS_KILL;
+      nsock_trace_handler_callback(nsp, nse);
+      nse->handler(nsp, nse, nse->userdata);
+      event_delete(nsp, nse);
+      gh_list_append(&nsp->free_events, &nse->nodeq_io);
+    }
+  }
+
+  gh_heap_free(&nsp->expirables);
+
+  /* foreach struct niod */
+  for (current = gh_list_first_elem(&nsp->active_iods);
+       current != NULL;
+       current = next) {
+    next = gh_lnode_next(current);
+    nsi = container_of(current, struct niod, nodeq);
+
+    nsock_iod_delete(nsi, NSOCK_PENDING_ERROR);
+
+    gh_list_remove(&nsp->active_iods, current);
+    gh_list_prepend(&nsp->free_iods, &nsi->nodeq);
+  }
+
+  /* Now we free all the memory in the free iod list */
+  while ((current = gh_list_pop(&nsp->free_iods))) {
+    nsi = container_of(current, struct niod, nodeq);
+    free(nsi);
+  }
+
+  while ((current = gh_list_pop(&nsp->free_events))) {
+    nse = lnode_nevent(current);
+    free(nse);
+  }
+
+  gh_list_free(&nsp->active_iods);
+  gh_list_free(&nsp->free_iods);
+  gh_list_free(&nsp->free_events);
+
+  nsock_engine_destroy(nsp);
+
+#if HAVE_OPENSSL
+  nsp_ssl_cleanup(nsp);
+#endif
+
+  free(nsp);
+}
+
+void nsock_library_initialize(void) {
+#ifndef WIN32
+  rlim_t res;
+
+  /* We want to make darn sure the evil SIGPIPE is ignored */
+  signal(SIGPIPE, SIG_IGN);
+
+  /* And we're gonna need sockets -- LOTS of sockets ... */
+  res = maximize_fdlimit();
+  assert(res > 7);
+#endif
+  return;
+}
+
diff --git a/nsock/src/nsock_proxy.c b/nsock/src/nsock_proxy.c
new file mode 100644
index 0000000..29a1f3d
--- /dev/null
+++ b/nsock/src/nsock_proxy.c
@@ -0,0 +1,439 @@
+/***************************************************************************
+ * nsock_proxy.c -- This contains the functions relating to proxies.       *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include <string.h>
+
+#define IN_RANGE(x, min, max) ((x) >= (min) && (x) <= (max))
+
+static struct proxy_node *proxy_node_new(const char *proxystr, const char *end);
+
+/* --- Implemented proxy backends --- */
+extern const struct proxy_spec ProxySpecHttp;
+extern const struct proxy_spec ProxySpecSocks4;
+
+
+static const struct proxy_spec *ProxyBackends[] = {
+  &ProxySpecHttp,
+  &ProxySpecSocks4,
+  NULL
+};
+
+
+/* A proxy chain is a comma-separated list of proxy specification strings:
+ * proto://[user:pass@]host[:port] */
+int nsock_proxychain_new(const char *proxystr, nsock_proxychain *chain, nsock_pool nspool) {
+  struct npool *nsp = (struct npool *)nspool;
+  struct proxy_chain *pxc, **pchain = (struct proxy_chain **)chain;
+
+  *pchain = NULL;
+
+  pxc = (struct proxy_chain *)safe_malloc(sizeof(struct proxy_chain));
+  gh_list_init(&pxc->nodes);
+
+  if (proxystr) {
+    const char *next = proxystr;
+    const char *end = strchr(proxystr, ',');
+    struct proxy_node *proxy;
+
+    while (end != NULL) {
+      proxy = proxy_node_new(next, end);
+      if (!proxy)
+        return -1;
+      gh_list_append(&pxc->nodes, &proxy->nodeq);
+      next = end + 1;
+      end = strchr(next, ',');
+    }
+    proxy = proxy_node_new(next, strchr(next, '\0'));
+    if (!proxy)
+      return -1;
+    gh_list_append(&pxc->nodes, &proxy->nodeq);
+  }
+
+  if (nsp) {
+    if (nsock_pool_set_proxychain(nspool, pxc) < 0) {
+      nsock_proxychain_delete(pxc);
+      return -1;
+    }
+  }
+
+  *pchain = pxc;
+  return 1;
+}
+
+void nsock_proxychain_delete(nsock_proxychain chain) {
+  struct proxy_chain *pchain = (struct proxy_chain *)chain;
+  gh_lnode_t *lnode;
+
+  if (!pchain)
+    return;
+
+  while ((lnode = gh_list_pop(&pchain->nodes)) != NULL) {
+    struct proxy_node *node;
+
+    node = container_of(lnode, struct proxy_node, nodeq);
+    node->spec->ops->node_delete(node);
+  }
+
+  gh_list_free(&pchain->nodes);
+  free(pchain);
+}
+
+int nsock_pool_set_proxychain(nsock_pool nspool, nsock_proxychain chain) {
+  struct npool *nsp = (struct npool *)nspool;
+  assert(nsp != NULL);
+
+  if (nsp && nsp->px_chain) {
+    nsock_log_error("Invalid call. Existing proxychain on this nsock_pool");
+    return -1;
+  }
+
+  if (gh_list_count(&chain->nodes) < 1) {
+    nsock_log_error("Invalid call. No proxies in chain");
+    return -1;
+  }
+
+  nsp->px_chain = (struct proxy_chain *)chain;
+  return 1;
+}
+
+struct proxy_chain_context *proxy_chain_context_new(nsock_pool nspool) {
+  struct npool *nsp = (struct npool *)nspool;
+  struct proxy_chain_context *ctx;
+
+  ctx = (struct proxy_chain_context *)safe_malloc(sizeof(struct proxy_chain_context));
+  ctx->px_chain = nsp->px_chain;
+  ctx->px_state = PROXY_STATE_INITIAL;
+  ctx->px_current = container_of(gh_list_first_elem(&nsp->px_chain->nodes),
+                                 struct proxy_node,
+                                 nodeq);
+  return ctx;
+}
+
+void proxy_chain_context_delete(struct proxy_chain_context *ctx) {
+  free(ctx);
+}
+
+static void uri_free(struct uri *uri) {
+  free(uri->scheme);
+  free(uri->user);
+  free(uri->pass);
+  free(uri->host);
+  free(uri->path);
+}
+
+static int lowercase(char *s) {
+  char *p;
+
+  for (p = s; *p != '\0'; p++)
+    *p = tolower((int) (unsigned char) *p);
+
+  return p - s;
+}
+
+static int hex_digit_value(char digit) {
+  static const char DIGITS[] = "0123456789abcdef";
+  const char *p;
+
+  if ((unsigned char)digit == '\0')
+    return -1;
+
+  p = strchr(DIGITS, tolower((int)(unsigned char)digit));
+  if (p == NULL)
+    return -1;
+
+  return p - DIGITS;
+}
+
+static int percent_decode(char *s) {
+  char *p, *q;
+
+  /* Skip to the first '%'. If there are no percent escapes, this lets us
+   * return without doing any copying. */
+  q = s;
+  while (*q != '\0' && *q != '%')
+    q++;
+
+  p = q;
+  while (*q != '\0') {
+    if (*q == '%') {
+      int c, d;
+
+      q++;
+      c = hex_digit_value(*q);
+      if (c == -1)
+        return -1;
+      q++;
+      d = hex_digit_value(*q);
+      if (d == -1)
+        return -1;
+
+      *p++ = c * 16 + d;
+      q++;
+      } else {
+        *p++ = *q++;
+      }
+  }
+  *p = '\0';
+
+  return p - s;
+}
+
+static int uri_parse_authority(const char *authority, const char *end, struct uri *uri) {
+  const char *portsep;
+  const char *host_start, *host_end;
+  const char *tail;
+
+  /* We do not support "user:pass@" userinfo. The proxy has no use for it. */
+  if (strchr_p(authority, end, '@') != NULL)
+    return -1;
+
+  /* Find the beginning and end of the host. */
+  host_start = authority;
+
+  if (*host_start == '[') {
+    /* IPv6 address in brackets. */
+    host_start++;
+    if (host_start >= end ||
+        NULL == (host_end = strchr_p(host_start, end, ']'))
+       ) {
+      nsock_log_error("Invalid IPv6 address: %s", authority);
+      return -1;
+    }
+
+    portsep = host_end + 1;
+
+  } else {
+    for (portsep = end; portsep > host_start && *portsep != ':'; portsep--);
+
+    if (portsep == host_start)
+      portsep = end;
+    host_end = portsep;
+  }
+
+  /* Get the port number. */
+  if (portsep + 1 < end && *portsep == ':') {
+    long n;
+
+    errno = 0;
+    n = parse_long(portsep + 1, &tail);
+    if (errno || tail != end || !IN_RANGE(n, 1, 65535)) {
+      nsock_log_error("Invalid port number (%ld), errno = %d", n, errno);
+      return -1;
+    }
+    uri->port = n;
+  } else {
+    uri->port = -1;
+  }
+
+  /* Get the host. */
+  uri->host = mkstr(host_start, host_end);
+  if (percent_decode(uri->host) < 0) {
+    nsock_log_error("Invalid URL encoding in host: %s", uri->host);
+    free(uri->host);
+    uri->host = NULL;
+    return -1;
+  }
+
+  return 1;
+}
+
+static int parse_uri(const char *proxystr, const char *end, struct uri *uri) {
+  const char *p, *q;
+
+  /* Scheme, section 3.1. */
+  p = proxystr;
+  if (!isalpha(*p))
+    goto fail;
+
+  q = p;
+  while (isalpha(*q) || isdigit(*q) || *q == '+' || *q == '-' || *q == '.') {
+    q++;
+    if (q >= end)
+      goto fail;
+  }
+
+  if (*q != ':')
+      goto fail;
+
+  uri->scheme = mkstr(p, q);
+
+  /* "An implementation should accept uppercase letters as equivalent to
+   * lowercase in scheme names (e.g., allow "HTTP" as well as "http") for the
+   * sake of robustness..." */
+  lowercase(uri->scheme);
+
+  /* Authority, section 3.2. */
+  p = q + 1;
+  if (p >= end)
+    goto fail;
+  if (p + 1 < end && *p == '/' && *(p + 1) == '/') {
+
+    p += 2;
+    q = p;
+    while (q < end && !(*q == '/' || *q == '?' || *q == '#' || *q == '\0'))
+      q++;
+
+    if (uri_parse_authority(p, q, uri) < 0) {
+      goto fail;
+    }
+
+    p = q;
+  }
+
+  /* Path, section 3.3. We include the query and fragment in the path. The
+   * path is also not percent-decoded because we just pass it on to the origin
+   * server. */
+
+  uri->path = mkstr(p, end);
+
+  return 1;
+
+fail:
+  uri_free(uri);
+  return -1;
+}
+
+static struct proxy_node *proxy_node_new(const char *proxystr, const char *end) {
+  int i;
+
+  for (i = 0; ProxyBackends[i] != NULL; i++) {
+    const struct proxy_spec *pspec;
+    size_t prefix_len;
+
+    pspec = ProxyBackends[i];
+    prefix_len = strlen(pspec->prefix);
+    if (end - proxystr > prefix_len && strncasecmp(proxystr, pspec->prefix, prefix_len) == 0) {
+      struct proxy_node *proxy = NULL;
+      struct uri uri;
+
+      memset(&uri, 0x00, sizeof(struct uri));
+
+      if (parse_uri(proxystr, end, &uri) < 0)
+        break;
+
+      if (pspec->ops->node_new(&proxy, &uri) < 0) {
+        nsock_log_error("Cannot initialize proxy node %s", proxystr);
+        uri_free(&uri);
+        break;
+      }
+
+      uri_free(&uri);
+
+      return proxy;
+    }
+  }
+  nsock_log_error("Invalid protocol in proxy specification string: %s", proxystr);
+  return NULL;
+}
+
+void forward_event(nsock_pool nspool, nsock_event nsevent, void *udata) {
+  struct npool *nsp = (struct npool *)nspool;
+  struct nevent *nse = (struct nevent *)nsevent;
+  enum nse_type cached_type;
+  enum nse_status cached_status;
+
+  cached_type = nse->type;
+  cached_status = nse->status;
+
+  nse->type = nse->iod->px_ctx->target_ev_type;
+
+  if (nse->status != NSE_STATUS_SUCCESS)
+    nse->status = NSE_STATUS_PROXYERROR;
+
+  nsock_log_info("Forwarding event upstream: TCP connect %s (IOD #%li) EID %li",
+                 nse_status2str(nse->status), nse->iod->id, nse->id);
+
+  nse->iod->px_ctx->target_handler(nsp, nse, udata);
+
+  nse->type = cached_type;
+  nse->status = cached_status;
+}
+
+void nsock_proxy_ev_dispatch(nsock_pool nspool, nsock_event nsevent, void *udata) {
+  struct nevent *nse = (struct nevent *)nsevent;
+
+  if (nse->status == NSE_STATUS_SUCCESS) {
+    struct proxy_node *current;
+
+    current = nse->iod->px_ctx->px_current;
+    assert(current);
+    current->spec->ops->handler(nspool, nsevent, udata);
+  } else {
+    forward_event(nspool, nsevent, udata);
+  }
+}
+
+int proxy_resolve(const char *host, struct sockaddr *addr, size_t *addrlen, int ai_family) {
+  struct addrinfo hints;
+  struct addrinfo *res;
+  int rc;
+
+  memset(&hints, 0, sizeof(hints));
+  hints.ai_family = ai_family;
+  /* All proxy types are TCP-only at the moment */
+  hints.ai_socktype = SOCK_STREAM;
+
+  rc = getaddrinfo(host, NULL, &hints, &res);
+  if (rc) {
+    nsock_log_info("getaddrinfo error: %s", gai_strerror(rc));
+    return -abs(rc);
+  }
+
+  *addr = *res->ai_addr;
+  *addrlen = res->ai_addrlen;
+  freeaddrinfo(res);
+  return 1;
+}
+
diff --git a/nsock/src/nsock_proxy.h b/nsock/src/nsock_proxy.h
new file mode 100644
index 0000000..57d8b12
--- /dev/null
+++ b/nsock/src/nsock_proxy.h
@@ -0,0 +1,176 @@
+/***************************************************************************
+ * nsock_proxy.h -- PRIVATE interface definitions for proxy handling.      *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef NSOCK_PROXY_H
+#define NSOCK_PROXY_H
+
+#include "gh_list.h"
+
+#if HAVE_NETDB_H
+#include <netdb.h>
+#endif
+
+#include <nsock.h>
+#include <errno.h>
+
+
+/* ------------------- CONSTANTS ------------------- */
+enum nsock_proxy_type {
+  PROXY_TYPE_HTTP = 0,
+  PROXY_TYPE_SOCKS4,
+  PROXY_TYPE_COUNT,
+};
+
+enum nsock_proxy_state {
+  /* Common initial state for all proxy types. */
+  PROXY_STATE_INITIAL,
+
+  /* HTTP proxy states. */
+  PROXY_STATE_HTTP_TCP_CONNECTED,
+  PROXY_STATE_HTTP_TUNNEL_ESTABLISHED,
+
+  /* SOCKS 4 proxy states. */
+  PROXY_STATE_SOCKS4_TCP_CONNECTED,
+  PROXY_STATE_SOCKS4_TUNNEL_ESTABLISHED,
+};
+
+
+/* ------------------- STRUCTURES ------------------- */
+
+struct uri {
+  char *scheme;
+  char *user;
+  char *pass;
+  char *host;
+  char *path;
+  int port;
+};
+
+/* Static information about a proxy node in the chain. This is generated by
+ * parsing the proxy specification string given by user. Those structures are
+ * then read-only and stored in the nsock_pool. */
+struct proxy_node {
+  const struct proxy_spec *spec;
+
+  struct sockaddr_storage ss;
+  size_t sslen;
+  unsigned short port;
+  char *nodestr; /* used for log messages */
+  gh_lnode_t nodeq;
+};
+
+/* Ordered list of proxy nodes, as specified in the proxy specification string. */
+struct proxy_chain {
+  gh_list_t nodes;
+};
+
+/* IOD-specific context. For each IOD we establish a tunnel through the chain of
+ * proxies. This structure stores all the related information. */
+struct proxy_chain_context {
+  const struct proxy_chain *px_chain;
+
+  /* Nodes iterator in px_chain->nodes */
+  struct proxy_node *px_current;
+
+  /* Current node connection state. */
+  enum nsock_proxy_state px_state;
+
+  /* Those fields are used to store information about the final target
+   * to reach. */
+  enum nse_type target_ev_type;
+  struct sockaddr_storage target_ss;
+  size_t target_sslen;
+  unsigned short target_port;
+  nsock_ev_handler target_handler;
+};
+
+struct proxy_op {
+  int (*node_new)(struct proxy_node **node, const struct uri *uri);
+  void (*node_delete)(struct proxy_node *node);
+  void (*handler)(nsock_pool nspool, nsock_event nsevent, void *udata);
+};
+
+struct proxy_spec {
+  const char *prefix;
+  enum nsock_proxy_type type;
+  const struct proxy_op *ops;
+};
+
+
+/* ------------------- UTIL FUNCTIONS ------------------- */
+int proxy_resolve(const char *host, struct sockaddr *addr, size_t *addrlen, int ai_family);
+
+static inline struct proxy_node *proxy_ctx_node_next(struct proxy_chain_context *ctx) {
+  gh_lnode_t *next;
+
+  assert(ctx);
+  assert(ctx->px_current);
+
+  next = gh_lnode_next(&ctx->px_current->nodeq);
+  if (!next)
+    return NULL;
+
+  return container_of(next, struct proxy_node, nodeq);
+}
+
+
+/* ------------------- PROTOTYPES ------------------- */
+
+struct proxy_chain_context *proxy_chain_context_new(nsock_pool nspool);
+void proxy_chain_context_delete(struct proxy_chain_context *ctx);
+
+void nsock_proxy_ev_dispatch(nsock_pool nspool, nsock_event nsevent, void *udata);
+void forward_event(nsock_pool nspool, nsock_event nse, void *udata);
+
+
+#endif /* NSOCK_PROXY_H */
+
diff --git a/nsock/src/nsock_read.c b/nsock/src/nsock_read.c
new file mode 100644
index 0000000..27f874f
--- /dev/null
+++ b/nsock/src/nsock_read.c
@@ -0,0 +1,130 @@
+/***************************************************************************
+ * nsock_read.c -- This contains the functions for requesting various read *
+ * events from the nsock parallel socket event library                     *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include "netutils.h"
+
+
+/* Read up to nlines lines (terminated with \n, which of course includes \r\n),
+ * or until EOF, or until the timeout, whichever comes first.  Note that
+ * NSE_STATUS_SUCCESS will be returned in the case of EOF or timeout if at least
+ * 1 char has been read.  Also note that you may get more than 'nlines' back --
+ * we just stop once "at least" 'nlines' is read */
+nsock_event_id nsock_readlines(nsock_pool nsp, nsock_iod ms_iod,
+                               nsock_ev_handler handler, int timeout_msecs,
+                               void *userdata, int nlines) {
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+
+  nse = event_new(ms, NSE_TYPE_READ, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("Read request for %d lines from IOD #%li [%s] EID %li",
+                 nlines, nsi->id, get_peeraddr_string(nsi), nse->id);
+
+  nse->readinfo.read_type = NSOCK_READLINES;
+  nse->readinfo.num = nlines;
+
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
+/* Same as above, except it tries to read at least 'nbytes' instead of 'nlines'. */
+nsock_event_id nsock_readbytes(nsock_pool nsp, nsock_iod ms_iod,
+                               nsock_ev_handler handler, int timeout_msecs,
+                               void *userdata, int nbytes) {
+
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+
+  nse = event_new(ms, NSE_TYPE_READ, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("Read request for %d bytes from IOD #%li [%s] EID %li",
+                 nbytes, nsi->id, get_peeraddr_string(nsi), nse->id);
+
+  nse->readinfo.read_type = NSOCK_READBYTES;
+  nse->readinfo.num = nbytes;
+
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
+
+/* The simplest read function -- returns NSE_STATUS_SUCCESS when it
+ * reads anything, otherwise it returns timeout, eof, or error as appropriate */
+nsock_event_id nsock_read(nsock_pool nsp, nsock_iod ms_iod,
+                          nsock_ev_handler handler, int timeout_msecs,
+                          void *userdata) {
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct npool *ms = (struct npool *)nsp;
+  struct nevent *nse;
+
+  nse = event_new(ms, NSE_TYPE_READ, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("Read request from IOD #%li [%s] (timeout: %dms) EID %li",
+                 nsi->id, get_peeraddr_string(nsi), timeout_msecs, nse->id);
+
+  nse->readinfo.read_type = NSOCK_READ;
+
+  nsock_pool_add_event(ms, nse);
+
+  return nse->id;
+}
+
diff --git a/nsock/src/nsock_ssl.c b/nsock/src/nsock_ssl.c
new file mode 100644
index 0000000..096ce72
--- /dev/null
+++ b/nsock/src/nsock_ssl.c
@@ -0,0 +1,278 @@
+/***************************************************************************
+ * nsock_ssl.c -- This contains functions that relate somewhat exclusively *
+ * to SSL (over TCP) support in nsock.  Where SSL support is incidental,   *
+ * it is often in other files where code can be more easily shared between *
+ * the SSL and NonSSL paths.                                               *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include "nsock_ssl.h"
+#include "netutils.h"
+
+#if HAVE_OPENSSL
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+#include <openssl/provider.h>
+#endif
+
+/* Disallow anonymous ciphers (Diffie-Hellman key agreement), low bit-strength
+ * ciphers, export-crippled ciphers, and MD5. Prefer ciphers in decreasing order
+ * of key size. The cipher list is taken from the book Network Security with
+ *  OpenSSL. To see exactly what ciphers are enabled, use the command
+ *   openssl ciphers -v '...'
+ * where ... is the string below. */
+#define CIPHERS_SECURE "ALL:!aNULL:!eNULL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"
+
+/* This list of ciphers is for speed and compatibility, not security. Any cipher
+ *  is accepted, and the list is sorted by speed based on Brian Hatch's
+ *  (bri@ifokr.org) tests on an Pentium 686 against the ciphers listed. */
+#define CIPHERS_FAST "RC4-SHA:RC4-MD5:NULL-SHA:EXP-DES-CBC-SHA:EXP-EDH-RSA-DES-CBC-SHA:EXP-RC4-MD5:NULL-MD5:EDH-RSA-DES-CBC-SHA:EXP-RC2-CBC-MD5:EDH-RSA-DES-CBC3-SHA:EXP-ADH-RC4-MD5:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA:EXP-ADH-DES-CBC-SHA:ADH-AES256-SHA:ADH-DES-CBC-SHA:ADH-RC4-MD5:AES256-SHA:DES-CBC-SHA:DES-CBC3-SHA:ADH-DES-CBC3-SHA:AES128-SHA:ADH-AES128-SHA:eNULL:ALL"
+
+extern struct timeval nsock_tod;
+#define NSOCK_SSL_STATE_UNINITIALIZED -1
+#define NSOCK_SSL_STATE_INITIALIZED 1
+#define NSOCK_SSL_STATE_ATEXIT 0
+static int nsock_ssl_state = NSOCK_SSL_STATE_UNINITIALIZED;
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined LIBRESSL_VERSION_NUMBER
+static void nsock_ssl_atexit(void)
+{
+  nsock_ssl_state = NSOCK_SSL_STATE_ATEXIT;
+}
+#endif
+void nsp_ssl_cleanup(struct npool *nsp)
+{
+  if (nsock_ssl_state != NSOCK_SSL_STATE_ATEXIT)
+  {
+    if (nsp->sslctx != NULL)
+      SSL_CTX_free(nsp->sslctx);
+#ifdef HAVE_DTLS_CLIENT_METHOD
+    if (nsp->dtlsctx != NULL)
+      SSL_CTX_free(nsp->dtlsctx);
+#endif
+  }
+  nsp->sslctx = NULL;
+#ifdef HAVE_DTLS_CLIENT_METHOD
+  nsp->dtlsctx = NULL;
+#endif
+}
+
+static SSL_CTX *ssl_init_helper(const SSL_METHOD *method) {
+  SSL_CTX *ctx;
+
+  if (nsock_ssl_state == NSOCK_SSL_STATE_UNINITIALIZED)
+  {
+    nsock_ssl_state = NSOCK_SSL_STATE_INITIALIZED;
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined LIBRESSL_VERSION_NUMBER
+    SSL_load_error_strings();
+    SSL_library_init();
+#else
+    OPENSSL_atexit(nsock_ssl_atexit);
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+    if (NULL == OSSL_PROVIDER_load(NULL, "legacy"))
+    {
+      nsock_log_info("OpenSSL legacy provider failed to load: %s",
+          ERR_error_string(ERR_get_error(), NULL));
+    }
+    if (NULL == OSSL_PROVIDER_load(NULL, "default"))
+    {
+      nsock_log_error("OpenSSL default provider failed to load: %s",
+          ERR_error_string(ERR_get_error(), NULL));
+    }
+#endif
+#endif
+  }
+
+  ctx = SSL_CTX_new(method);
+  if (!ctx) {
+    fatal("OpenSSL failed to create a new SSL_CTX: %s",
+          ERR_error_string(ERR_get_error(), NULL));
+  }
+
+  /* Our SSL* will always have the SSL_SESSION* inside it, so we neither need to
+   * use nor waste memory for the session cache.  (Use '1' because '0' means
+   * 'infinite'.)   */
+  SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF|SSL_SESS_CACHE_NO_AUTO_CLEAR);
+  SSL_CTX_sess_set_cache_size(ctx, 1);
+  SSL_CTX_set_timeout(ctx, 3600); /* pretty unnecessary */
+
+  return ctx;
+}
+
+/* Create an SSL_CTX and do initialization that is common to all init modes. */
+static SSL_CTX *ssl_init_common() {
+  return ssl_init_helper(SSLv23_client_method());
+}
+
+/* Initializes an Nsock pool to create SSL connections. This sets an internal
+ * SSL_CTX, which is like a template that sets options for all connections that
+ * are made from it. The connections made from this context will use only secure
+ * ciphers but no server certificate verification is done. Returns the SSL_CTX
+ * so you can set your own options. */
+static nsock_ssl_ctx nsock_pool_ssl_init_helper(SSL_CTX *ctx, int flags) {
+  char rndbuf[128];
+
+  /* Get_random_bytes may or may not provide high-quality randomness. Add it to
+   * the entropy pool without increasing the entropy estimate (third argument of
+   * RAND_add is 0). We rely on OpenSSL's entropy gathering, called implicitly
+   * by RAND_status, to give us what we need, or else bail out if it fails. */
+  get_random_bytes(rndbuf, sizeof(rndbuf));
+  RAND_add(rndbuf, sizeof(rndbuf), 0);
+
+  if (!(flags & NSOCK_SSL_MAX_SPEED)) {
+    if (!RAND_status())
+      fatal("%s: Failed to seed OpenSSL PRNG"
+            " (RAND_status returned false).", __func__);
+  }
+
+  /* SSL_OP_ALL sets bug-compatibility for pretty much everything.
+   * SSL_OP_NO_SSLv2 disables the less-secure SSLv2 while allowing us to use the
+   * SSLv2-compatible SSLv23_client_method. */
+  SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
+  SSL_CTX_clear_options(ctx, SSL_OP_NO_SSLv2);
+  SSL_CTX_set_options(ctx, flags & NSOCK_SSL_MAX_SPEED ?
+                                  SSL_OP_ALL : SSL_OP_ALL|SSL_OP_NO_SSLv2);
+
+  if (!SSL_CTX_set_cipher_list(ctx, flags & NSOCK_SSL_MAX_SPEED ?
+                                           CIPHERS_FAST : CIPHERS_SECURE))
+    fatal("Unable to set OpenSSL cipher list: %s",
+          ERR_error_string(ERR_get_error(), NULL));
+
+  return ctx;
+}
+
+nsock_ssl_ctx nsock_pool_ssl_init(nsock_pool ms_pool, int flags) {
+  struct npool *ms = (struct npool *)ms_pool;
+
+  if (ms->sslctx == NULL)
+    ms->sslctx = ssl_init_common();
+  return nsock_pool_ssl_init_helper(ms->sslctx, flags);
+}
+
+#ifdef HAVE_DTLS_CLIENT_METHOD
+
+/* Create an SSL_CTX and do initialisation, creating a DTLS client */
+static SSL_CTX *dtls_init_common() {
+  return ssl_init_helper(DTLS_client_method());
+}
+
+/* Initializes an Nsock pool to create DTLS connections. Very much similar to
+ * nsock_pool_ssl_init, just with DTLS. */
+nsock_ssl_ctx nsock_pool_dtls_init(nsock_pool ms_pool, int flags) {
+  SSL_CTX *dtls_ctx = NULL;
+  struct npool *ms = (struct npool *)ms_pool;
+
+  if (ms->dtlsctx == NULL)
+    ms->dtlsctx = dtls_init_common();
+  dtls_ctx = (SSL_CTX *) nsock_pool_ssl_init_helper(ms->dtlsctx, flags);
+
+  /* Don't add padding or the ClientHello will fragment and not connect properly. */
+  SSL_CTX_clear_options(dtls_ctx, SSL_OP_TLSEXT_PADDING);
+
+  if (!SSL_CTX_set_cipher_list(dtls_ctx, "DEFAULT"))
+    fatal("Unable to set OpenSSL cipher list: %s",
+          ERR_error_string(ERR_get_error(), NULL));
+
+  return dtls_ctx;
+}
+
+#else /* OpenSSL Version does not support DTLS */
+
+nsock_ssl_ctx nsock_pool_dtls_init(nsock_pool ms_pool, int flags) {
+  fatal("%s called with no OpenSSL DTLS support", __func__);
+}
+
+#endif
+
+/* Check server certificate verification, after a connection is established. We
+ * check first that a certificate was even offered, then call
+ * SSL_get_verify_result to get the overall status of verification. (Just
+ * calling SSL_get_verify_result is not enough because that function returns
+ * X509_V_OK when 0 certificates are presented.) If the verification mode of the
+ * SSL object is SSL_VERIFY_NONE, or if OpenSSL is disabled, this function
+ * always returns true. */
+int nsi_ssl_post_connect_verify(const nsock_iod nsockiod) {
+  struct niod *iod = (struct niod *)nsockiod;
+
+  assert(iod->ssl != NULL);
+  if (SSL_get_verify_mode(iod->ssl) != SSL_VERIFY_NONE) {
+    X509 *cert;
+
+    cert = SSL_get_peer_certificate(iod->ssl);
+    if (cert == NULL)
+      /* No certificate presented. */
+      return 0;
+
+    X509_free(cert);
+
+    if (SSL_get_verify_result(iod->ssl) != X509_V_OK)
+      /* Something wrong with verification. */
+      return 0;
+  }
+  return 1;
+}
+
+#else /* NOT HAVE_OPENSSL */
+
+nsock_ssl_ctx nsock_pool_ssl_init(nsock_pool ms_pool, int flags) {
+  fatal("%s called with no OpenSSL support", __func__);
+}
+
+nsock_ssl_ctx nsock_pool_dtls_init(nsock_pool ms_pool, int flags) {
+  fatal("%s called with no OpenSSL support", __func__);
+}
+
+int nsi_ssl_post_connect_verify(const nsock_iod nsockiod) {
+  return 1;
+}
+
+#endif
diff --git a/nsock/src/nsock_ssl.h b/nsock/src/nsock_ssl.h
new file mode 100644
index 0000000..f23f615
--- /dev/null
+++ b/nsock/src/nsock_ssl.h
@@ -0,0 +1,85 @@
+/***************************************************************************
+ * nsock_ssl.c -- This contains functions that relate somewhat exclusively *
+ * to SSL (over TCP) support in nsock.  Where SSL support is incidental,   *
+ * it is often in other files where code can be more easily shared between *
+ * the SSL and NonSSL paths.                                               *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef NSOCK_SSL_H
+#define NSOCK_SSL_H
+
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#endif
+#include "nsock_internal.h"
+
+#if HAVE_OPENSSL
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+/* Deprecated in OpenSSL 3.0 */
+#define SSL_get_peer_certificate SSL_get1_peer_certificate
+#endif
+
+struct sslinfo {
+  /* SSL_ERROR_NONE, SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_READ, or
+   * SSL_ERROR_WANT_WRITE */
+  int ssl_desire;
+};
+
+int nsi_ssl_post_connect_verify(const nsock_iod nsockiod);
+
+void nsp_ssl_cleanup(struct npool *nsp);
+#endif /* HAVE_OPENSSL */
+#endif /* NSOCK_SSL_H */
+
diff --git a/nsock/src/nsock_timers.c b/nsock/src/nsock_timers.c
new file mode 100644
index 0000000..c36fd0b
--- /dev/null
+++ b/nsock/src/nsock_timers.c
@@ -0,0 +1,76 @@
+/***************************************************************************
+ * nsock_timers.c -- This contains the functions for requesting timers     *
+ * from the nsock parallel socket event library                            *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+extern struct timeval nsock_tod;
+
+/* Send back an NSE_TYPE_TIMER after the number of milliseconds specified.  Of
+ * course it can also return due to error, cancellation, etc. */
+nsock_event_id nsock_timer_create(nsock_pool ms_pool, nsock_ev_handler handler,
+                                  int timeout_msecs, void *userdata) {
+  struct npool *nsp = (struct npool *)ms_pool;
+  struct nevent *nse;
+
+  nse = event_new(nsp, NSE_TYPE_TIMER, NULL, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nsock_log_info("Timer created - %dms from now.  EID %li", timeout_msecs,
+                 nse->id);
+
+  nsock_pool_add_event(nsp, nse);
+
+  return nse->id;
+}
+
diff --git a/nsock/src/nsock_write.c b/nsock/src/nsock_write.c
new file mode 100644
index 0000000..03b82b8
--- /dev/null
+++ b/nsock/src/nsock_write.c
@@ -0,0 +1,236 @@
+/***************************************************************************
+ * nsock_write.c -- This contains the functions relating to writing to     *
+ * sockets using the nsock parallel socket event library                   *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include "netutils.h"
+
+#include <nbase.h>
+#include <stdarg.h>
+#include <errno.h>
+
+nsock_event_id nsock_sendto(nsock_pool ms_pool, nsock_iod ms_iod, nsock_ev_handler handler, int timeout_msecs,
+                            void *userdata, struct sockaddr *saddr, size_t sslen, unsigned short port, const char *data, int datalen) {
+  struct npool *nsp = (struct npool *)ms_pool;
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct nevent *nse;
+  char displaystr[256];
+  struct sockaddr_in *sin = (struct sockaddr_in *)saddr;
+#if HAVE_IPV6
+  struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)saddr;
+#endif
+
+  nse = event_new(nsp, NSE_TYPE_WRITE, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  if (saddr->sa_family == AF_INET) {
+    sin->sin_port = htons(port);
+#if HAVE_SYS_UN_H
+  } else if (saddr->sa_family == AF_INET6) {
+#else
+  } else {
+#endif
+    assert(saddr->sa_family == AF_INET6);
+#if HAVE_IPV6
+    sin6->sin6_port = htons(port);
+#else
+    fatal("IPv6 address passed to %s call, but nsock was not compiled w/IPv6 support", __func__);
+#endif
+  }
+
+  assert(sslen <= sizeof(nse->writeinfo.dest));
+  memcpy(&nse->writeinfo.dest, saddr, sslen);
+  nse->writeinfo.destlen = sslen;
+
+  assert(sslen <= sizeof(nse->iod->peer));
+  memcpy(&nse->iod->peer, saddr, sslen);
+  nse->iod->peerlen = sslen;
+
+  if (datalen < 0)
+    datalen = (int) strlen(data);
+
+  if (NsockLogLevel == NSOCK_LOG_DBG_ALL && datalen < 80) {
+    memcpy(displaystr, ": ", 2);
+    memcpy(displaystr + 2, data, datalen);
+    displaystr[2 + datalen] = '\0';
+    replacenonprintable(displaystr + 2, datalen, '.');
+  } else {
+    displaystr[0] = '\0';
+  }
+  nsock_log_info("Sendto request for %d bytes to IOD #%li EID %li [%s]%s",
+                 datalen, nsi->id, nse->id, get_peeraddr_string(nse->iod),
+                 displaystr);
+
+  fs_cat(&nse->iobuf, data, datalen);
+
+  nsock_pool_add_event(nsp, nse);
+
+  return nse->id;
+}
+
+/* Write some data to the socket.  If the write is not COMPLETED within
+ * timeout_msecs , NSE_STATUS_TIMEOUT will be returned.  If you are supplying
+ * NUL-terminated data, you can optionally pass -1 for datalen and nsock_write
+ * will figure out the length itself */
+nsock_event_id nsock_write(nsock_pool ms_pool, nsock_iod ms_iod,
+          nsock_ev_handler handler, int timeout_msecs, void *userdata, const char *data, int datalen) {
+  struct npool *nsp = (struct npool *)ms_pool;
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct nevent *nse;
+  char displaystr[256];
+
+  nse = event_new(nsp, NSE_TYPE_WRITE, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  nse->writeinfo.dest.ss_family = AF_UNSPEC;
+
+  if (datalen < 0)
+    datalen = (int)strlen(data);
+
+  if (NsockLogLevel == NSOCK_LOG_DBG_ALL && datalen < 80) {
+    memcpy(displaystr, ": ", 2);
+    memcpy(displaystr + 2, data, datalen);
+    displaystr[2 + datalen] = '\0';
+    replacenonprintable(displaystr + 2, datalen, '.');
+  } else {
+    displaystr[0] = '\0';
+  }
+
+  nsock_log_info("Write request for %d bytes to IOD #%li EID %li [%s]%s",
+      datalen, nsi->id, nse->id, get_peeraddr_string(nsi),
+      displaystr);
+
+  fs_cat(&nse->iobuf, data, datalen);
+
+  nsock_pool_add_event(nsp, nse);
+
+  return nse->id;
+}
+
+/* Same as nsock_write except you can use a printf-style format and you can only use this for ASCII strings */
+nsock_event_id nsock_printf(nsock_pool ms_pool, nsock_iod ms_iod,
+          nsock_ev_handler handler, int timeout_msecs, void *userdata, char *format, ...) {
+  struct npool *nsp = (struct npool *)ms_pool;
+  struct niod *nsi = (struct niod *)ms_iod;
+  struct nevent *nse;
+  char buf[4096];
+  char *buf2 = NULL;
+  size_t buf2size;
+  int res, res2;
+  int strlength = 0;
+  char displaystr[256];
+
+  va_list ap;
+
+  nse = event_new(nsp, NSE_TYPE_WRITE, nsi, timeout_msecs, handler, userdata);
+  assert(nse);
+
+  va_start(ap,format);
+  res = Vsnprintf(buf, sizeof(buf), format, ap);
+  va_end(ap);
+
+  if (res >= 0) {
+    if (res >= sizeof(buf)) {
+      buf2size = res + 16;
+      buf2 = (char * )safe_malloc(buf2size);
+      va_start(ap,format);
+      res2 = Vsnprintf(buf2, buf2size, format, ap);
+      va_end(ap);
+      if (res2 < 0 || (size_t) res2 >= buf2size) {
+        free(buf2);
+        buf2 = NULL;
+      } else
+        strlength = res2;
+    } else {
+      buf2 = buf;
+      strlength = res;
+    }
+  }
+
+  if (!buf2) {
+    nse->event_done = 1;
+    nse->status = NSE_STATUS_ERROR;
+    nse->errnum = EMSGSIZE;
+  } else {
+    if (strlength == 0) {
+      nse->event_done = 1;
+      nse->status = NSE_STATUS_SUCCESS;
+    } else {
+      fs_cat(&nse->iobuf, buf2, strlength);
+    }
+  }
+
+  if (NsockLogLevel == NSOCK_LOG_DBG_ALL &&
+      nse->status != NSE_STATUS_ERROR &&
+      strlength < 80) {
+    memcpy(displaystr, ": ", 2);
+    memcpy(displaystr + 2, buf2, strlength);
+    displaystr[2 + strlength] = '\0';
+    replacenonprintable(displaystr + 2, strlength, '.');
+  } else {
+    displaystr[0] = '\0';
+  }
+
+  nsock_log_info("Write request for %d bytes to IOD #%li EID %li [%s]%s",
+                 strlength, nsi->id, nse->id, get_peeraddr_string(nsi),
+                 displaystr);
+
+  if (buf2 != buf)
+    free(buf2);
+
+  nsock_pool_add_event(nsp, nse);
+
+  return nse->id;
+}
+
diff --git a/nsock/src/proxy_http.c b/nsock/src/proxy_http.c
new file mode 100644
index 0000000..a6831d4
--- /dev/null
+++ b/nsock/src/proxy_http.c
@@ -0,0 +1,210 @@
+/***************************************************************************
+ * proxy_http.c -- HTTP Connect proxying.                                  *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id $ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include <string.h>
+
+#define DEFAULT_PROXY_PORT_HTTP 8080
+
+
+extern struct timeval nsock_tod;
+extern const struct proxy_spec ProxySpecHttp;
+
+
+static int proxy_http_node_new(struct proxy_node **node, const struct uri *uri) {
+  int rc;
+  struct proxy_node *proxy;
+
+  proxy = (struct proxy_node *)safe_zalloc(sizeof(struct proxy_node));
+  proxy->spec = &ProxySpecHttp;
+
+  rc = proxy_resolve(uri->host, (struct sockaddr *)&proxy->ss, &proxy->sslen, AF_UNSPEC);
+  if (rc < 0) {
+    free(proxy);
+    *node = NULL;
+    return -1;
+  }
+
+  if (uri->port == -1)
+    proxy->port = DEFAULT_PROXY_PORT_HTTP;
+  else
+    proxy->port = (unsigned short)uri->port;
+
+  rc = asprintf(&proxy->nodestr, "http://%s:%d", uri->host, proxy->port);
+  if (rc < 0) {
+    /* asprintf() failed for some reason but this is not a disaster (yet).
+     * Set nodestr to NULL and try to keep on going. */
+    proxy->nodestr = NULL;
+  }
+
+  *node = proxy;
+
+  return 1;
+}
+
+static void proxy_http_node_delete(struct proxy_node *node) {
+  if (!node)
+    return;
+
+  free(node->nodestr);
+
+  free(node);
+}
+
+static int handle_state_initial(struct npool *nsp, struct nevent *nse, void *udata) {
+  struct proxy_chain_context *px_ctx = nse->iod->px_ctx;
+  struct sockaddr_storage *ss;
+  size_t sslen;
+  unsigned short port;
+  struct proxy_node *next;
+  int timeout;
+
+  px_ctx->px_state = PROXY_STATE_HTTP_TCP_CONNECTED;
+
+  next = proxy_ctx_node_next(px_ctx);
+  if (next) {
+    ss    = &next->ss;
+    sslen = next->sslen;
+    port  = next->port;
+  } else {
+    ss    = &px_ctx->target_ss;
+    sslen = px_ctx->target_sslen;
+    port  = px_ctx->target_port;
+  }
+
+  timeout = TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod);
+
+  nsock_printf(nsp, (nsock_iod)nse->iod, nsock_proxy_ev_dispatch,
+               timeout, udata, "CONNECT %s:%d HTTP/1.1\r\n\r\n",
+               inet_ntop_ez(ss, sslen), (int)port);
+
+  nsock_readlines(nsp, (nsock_iod)nse->iod, nsock_proxy_ev_dispatch,
+                  timeout, udata, 1);
+
+  return 0;
+}
+
+static int handle_state_tcp_connected(struct npool *nsp, struct nevent *nse, void *udata) {
+  struct proxy_chain_context *px_ctx = nse->iod->px_ctx;
+  char *res;
+  int reslen;
+
+  res = nse_readbuf(nse, &reslen);
+
+  /* TODO string check!! */
+  if (!((reslen >= 15) && strstr(res, "200 OK"))) {
+    struct proxy_node *node = px_ctx->px_current;
+
+    nsock_log_debug("Connection refused from proxy %s", node->nodestr);
+    return -EINVAL;
+  }
+
+  px_ctx->px_state = PROXY_STATE_HTTP_TUNNEL_ESTABLISHED;
+
+  if (proxy_ctx_node_next(px_ctx) == NULL) {
+    forward_event(nsp, nse, udata);
+  } else {
+    px_ctx->px_current = proxy_ctx_node_next(px_ctx);
+    px_ctx->px_state   = PROXY_STATE_INITIAL;
+    nsock_proxy_ev_dispatch(nsp, nse, udata);
+  }
+  return 0;
+}
+
+static void proxy_http_handler(nsock_pool nspool, nsock_event nsevent, void *udata) {
+  int rc = 0;
+  struct npool *nsp = (struct npool *)nspool;
+  struct nevent *nse = (struct nevent *)nsevent;
+
+  switch (nse->iod->px_ctx->px_state) {
+    case PROXY_STATE_INITIAL:
+      rc = handle_state_initial(nsp, nse, udata);
+      break;
+
+    case PROXY_STATE_HTTP_TCP_CONNECTED:
+      if (nse->type == NSE_TYPE_READ)
+        rc = handle_state_tcp_connected(nsp, nse, udata);
+      break;
+
+    case PROXY_STATE_HTTP_TUNNEL_ESTABLISHED:
+      forward_event(nsp, nse, udata);
+      break;
+
+    default:
+      fatal("Invalid proxy state!");
+  }
+
+  if (rc) {
+    nse->status = NSE_STATUS_PROXYERROR;
+    forward_event(nsp, nse, udata);
+  }
+}
+
+
+/* ---- PROXY DEFINITION ---- */
+static const struct proxy_op ProxyOpsHttp = {
+  proxy_http_node_new,
+  proxy_http_node_delete,
+  proxy_http_handler,
+};
+
+const struct proxy_spec ProxySpecHttp = {
+  "http://",
+  PROXY_TYPE_HTTP,
+  &ProxyOpsHttp,
+};
+
diff --git a/nsock/src/proxy_socks4.c b/nsock/src/proxy_socks4.c
new file mode 100644
index 0000000..c88ca38
--- /dev/null
+++ b/nsock/src/proxy_socks4.c
@@ -0,0 +1,241 @@
+/***************************************************************************
+ * proxy_socks4.c -- SOCKS4 proxying.                                      *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id $ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+
+#include <string.h>
+
+#define DEFAULT_PROXY_PORT_SOCKS4 1080
+
+
+extern struct timeval nsock_tod;
+extern const struct proxy_spec ProxySpecSocks4;
+
+
+struct socks4_data {
+    uint8_t  version;
+    uint8_t  type;
+    uint16_t port;
+    uint32_t address;
+    uint8_t  null;
+} __attribute__((packed));
+
+
+static int proxy_socks4_node_new(struct proxy_node **node, const struct uri *uri) {
+  int rc;
+  struct proxy_node *proxy;
+
+  proxy = (struct proxy_node *)safe_zalloc(sizeof(struct proxy_node));
+  proxy->spec = &ProxySpecSocks4;
+
+  rc = proxy_resolve(uri->host, (struct sockaddr *)&proxy->ss, &proxy->sslen, AF_INET);
+  if (rc < 0)
+    goto err_out;
+
+  if (proxy->ss.ss_family != AF_INET) {
+    rc = -1;
+    goto err_out;
+  }
+
+  if (uri->port == -1)
+    proxy->port = DEFAULT_PROXY_PORT_SOCKS4;
+  else
+    proxy->port = (unsigned short)uri->port;
+
+  rc = asprintf(&proxy->nodestr, "socks4://%s:%d", uri->host, proxy->port);
+  if (rc < 0) {
+    /* asprintf() failed for some reason but this is not a disaster (yet).
+     * Set nodestr to NULL and try to keep on going. */
+    proxy->nodestr = NULL;
+  }
+
+  rc = 1;
+
+err_out:
+  if (rc < 0) {
+    free(proxy);
+    proxy = NULL;
+  }
+  *node = proxy;
+  return rc;
+}
+
+static void proxy_socks4_node_delete(struct proxy_node *node) {
+  if (!node)
+    return;
+
+  free(node->nodestr);
+
+  free(node);
+}
+
+static inline void socks4_data_init(struct socks4_data *socks4,
+                                    struct sockaddr_storage *ss, size_t sslen,
+                                    unsigned short port) {
+  struct sockaddr_in *sin = (struct sockaddr_in *)ss;
+
+  memset(socks4, 0x00, sizeof(struct socks4_data));
+  socks4->version = 4;
+  socks4->type = 1;
+  socks4->port = htons(port);
+  assert(ss->ss_family == AF_INET);
+  socks4->address = sin->sin_addr.s_addr;
+}
+
+static int handle_state_initial(struct npool *nsp, struct nevent *nse, void *udata) {
+  struct proxy_chain_context *px_ctx = nse->iod->px_ctx;
+  struct sockaddr_storage *ss;
+  size_t sslen;
+  unsigned short port;
+  struct proxy_node *next;
+  struct socks4_data socks4;
+  int timeout;
+
+  px_ctx->px_state = PROXY_STATE_SOCKS4_TCP_CONNECTED;
+
+  next = proxy_ctx_node_next(px_ctx);
+  if (next) {
+    ss    = &next->ss;
+    sslen = next->sslen;
+    port  = next->port;
+  } else {
+    ss    = &px_ctx->target_ss;
+    sslen = px_ctx->target_sslen;
+    port  = px_ctx->target_port;
+  }
+
+  socks4_data_init(&socks4, ss, sslen, port);
+
+  timeout = TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod);
+
+  nsock_write(nsp, (nsock_iod)nse->iod, nsock_proxy_ev_dispatch, timeout, udata,
+              (char *)&socks4, sizeof(socks4));
+
+  nsock_readbytes(nsp, (nsock_iod)nse->iod, nsock_proxy_ev_dispatch, timeout,
+                  udata, 8);
+  return 0;
+}
+
+static int handle_state_tcp_connected(struct npool *nsp, struct nevent *nse, void *udata) {
+  struct proxy_chain_context *px_ctx = nse->iod->px_ctx;
+  char *res;
+  int reslen;
+
+  res = nse_readbuf(nse, &reslen);
+
+  if (!(reslen == 8 && res[1] == 90)) {
+    struct proxy_node *node = px_ctx->px_current;
+
+    nsock_log_debug("Ignoring invalid socks4 reply from proxy %s",
+                    node->nodestr);
+    return -EINVAL;
+  }
+
+  px_ctx->px_state = PROXY_STATE_SOCKS4_TUNNEL_ESTABLISHED;
+
+  if (proxy_ctx_node_next(px_ctx) == NULL) {
+    forward_event(nsp, nse, udata);
+  } else {
+    px_ctx->px_current = proxy_ctx_node_next(px_ctx);
+    px_ctx->px_state   = PROXY_STATE_INITIAL;
+    nsock_proxy_ev_dispatch(nsp, nse, udata);
+  }
+  return 0;
+}
+
+static void proxy_socks4_handler(nsock_pool nspool, nsock_event nsevent, void *udata) {
+  int rc = 0;
+  struct npool *nsp = (struct npool *)nspool;
+  struct nevent *nse = (struct nevent *)nsevent;
+
+  switch (nse->iod->px_ctx->px_state) {
+    case PROXY_STATE_INITIAL:
+      rc = handle_state_initial(nsp, nse, udata);
+      break;
+
+    case PROXY_STATE_SOCKS4_TCP_CONNECTED:
+      if (nse->type == NSE_TYPE_READ)
+        rc = handle_state_tcp_connected(nsp, nse, udata);
+      break;
+
+    case PROXY_STATE_SOCKS4_TUNNEL_ESTABLISHED:
+      forward_event(nsp, nse, udata);
+      break;
+
+    default:
+      fatal("Invalid proxy state!");
+  }
+
+  if (rc) {
+    nse->status = NSE_STATUS_PROXYERROR;
+    forward_event(nsp, nse, udata);
+  }
+}
+
+/* ---- PROXY DEFINITION ---- */
+static const struct proxy_op ProxyOpsSocks4 = {
+  proxy_socks4_node_new,
+  proxy_socks4_node_delete,
+  proxy_socks4_handler,
+};
+
+const struct proxy_spec ProxySpecSocks4 = {
+  "socks4://",
+  PROXY_TYPE_SOCKS4,
+  &ProxyOpsSocks4,
+};
+