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# SYNOPSIS
#
# PDNS_CHECK_LIBCRYPTO([action-if-found[, action-if-not-found]])
#
# DESCRIPTION
#
# Look for OpenSSL's libcrypto in a number of default spots, or in a
# user-selected spot (via --with-libcrypto). Sets
#
# LIBCRYPTO_INCLUDES to the include directives required
# LIBCRYPTO_LIBS to the -l directives required
# LIBCRYPTO_LDFLAGS to the -L or -R flags required
#
# and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
#
# This macro sets LIBCRYPTO_INCLUDES such that source files should use the
# openssl/ directory in include directives:
#
# #include <openssl/hmac.h>
#
# LICENSE
#
# Taken and modified from AX_CHECK_OPENSSL by:
# Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
# Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
#
# 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 1
AU_ALIAS([CHECK_LIBCRYPTO], [PDNS_CHECK_LIBCRYPTO])
AC_DEFUN([PDNS_CHECK_LIBCRYPTO], [
found=false
AC_ARG_WITH([libcrypto],
[AS_HELP_STRING([--with-libcrypto=DIR],
[root of the OpenSSL directory])],
[
case "$withval" in
"" | y | ye | yes | n | no)
AC_MSG_ERROR([Invalid --with-libcrypto value])
;;
*) ssldirs="$withval"
;;
esac
], [
# if pkg-config is installed and openssl has installed a .pc file,
# then use that information and don't search ssldirs
AC_CHECK_TOOL([PKG_CONFIG], [pkg-config])
if test x"$PKG_CONFIG" != x""; then
LIBCRYPTO_LDFLAGS=`$PKG_CONFIG libcrypto --libs-only-L 2>/dev/null`
if test $? = 0; then
LIBCRYPTO_LIBS=`$PKG_CONFIG libcrypto --libs-only-l 2>/dev/null`
LIBCRYPTO_INCLUDES=`$PKG_CONFIG libcrypto --cflags-only-I 2>/dev/null`
ssldir=`$PKG_CONFIG libcrypto --variable=prefix 2>/dev/null`
found=true
fi
fi
# no such luck; use some default ssldirs
if ! $found; then
ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
fi
]
)
# note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
# an 'openssl' subdirectory
if ! $found; then
LIBCRYPTO_INCLUDES=
for ssldir in $ssldirs; do
AC_MSG_CHECKING([for openssl/crypto.h in $ssldir])
if test -f "$ssldir/include/openssl/crypto.h"; then
LIBCRYPTO_INCLUDES="-I$ssldir/include"
LIBCRYPTO_LDFLAGS="-L$ssldir/lib"
LIBCRYPTO_LIBS="-lcrypto"
found=true
AC_MSG_RESULT([yes])
break
else
AC_MSG_RESULT([no])
fi
done
# if the file wasn't found, well, go ahead and try the link anyway -- maybe
# it will just work!
fi
if $found; then
AC_DEFINE([HAVE_LIBCRYPTO], [1], [Define to 1 if you have OpenSSL libcrypto])
fi
# try the preprocessor and linker with our new flags,
# being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
AC_MSG_CHECKING([whether compiling and linking against OpenSSL's libcrypto works])
echo "Trying link with LIBCRYPTO_LDFLAGS=$LIBCRYPTO_LDFLAGS;" \
"LIBCRYPTO_LIBS=$LIBCRYPTO_LIBS; LIBCRYPTO_INCLUDES=$LIBCRYPTO_INCLUDES" >&AS_MESSAGE_LOG_FD
save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
save_CPPFLAGS="$CPPFLAGS"
LDFLAGS="$LDFLAGS $LIBCRYPTO_LDFLAGS"
LIBS="$LIBCRYPTO_LIBS $LIBS"
CPPFLAGS="$LIBCRYPTO_INCLUDES $CPPFLAGS"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <openssl/bn.h>], [BN_new()])],
[
AC_MSG_RESULT([yes])
AC_CHECK_FUNCS([RAND_bytes RAND_pseudo_bytes CRYPTO_memcmp OPENSSL_init_crypto EVP_MD_CTX_new EVP_MD_CTX_free RSA_get0_key])
# you might be wondering why the stdarg.h and stddef.h includes,
# in which case please have a look at https://github.com/PowerDNS/pdns/issues/12926
# and weep, yelling at Red Hat
AC_CHECK_DECL(EVP_PKEY_CTX_set1_scrypt_salt,
[AC_DEFINE([HAVE_EVP_PKEY_CTX_SET1_SCRYPT_SALT], [1], [Define to 1 if you have EVP_PKEY_CTX_set1_scrypt_salt])],
[],
[#include <stdarg.h>
#include <stddef.h>
#include <openssl/kdf.h>])
$1
], [
AC_MSG_RESULT([no])
$2
])
CPPFLAGS="$save_CPPFLAGS"
LDFLAGS="$save_LDFLAGS"
LIBS="$save_LIBS"
AC_SUBST([LIBCRYPTO_INCLUDES])
AC_SUBST([LIBCRYPTO_LIBS])
AC_SUBST([LIBCRYPTO_LDFLAGS])
AM_CONDITIONAL([HAVE_LIBCRYPTO], [test "x$LIBCRYPTO_LIBS" != "x"])
])
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