Adding upstream version 1:2.6.4.upstream/1%2.6.4upstream

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

13 files changed, 6189 insertions, 0 deletions

diff --git a/support/export/Makefile.am b/support/export/Makefile.am
new file mode 100644
index 0000000..7338e1c
--- /dev/null
+++ b/support/export/Makefile.am
@@ -0,0 +1,52 @@
+## Process this file with automake to produce Makefile.in
+
+
+GENFILES_CLNT	= mount_clnt.c
+GENFILES_XDR	= mount_xdr.c
+GENFILES_H	= mount.h
+
+GENFILES	= $(GENFILES_CLNT) $(GENFILES_SVC) $(GENFILES_XDR) $(GENFILES_H)
+
+EXTRA_DIST	= mount.x
+
+noinst_LIBRARIES = libexport.a
+libexport_a_SOURCES = client.c export.c hostname.c \
+		      xtab.c mount_clnt.c mount_xdr.c \
+		      cache.c auth.c v4root.c fsloc.c \
+		      v4clients.c
+libexport_a_CPPFLAGS = $(AM_CPPFLAGS) $(CPPFLAGS) -I$(top_srcdir)/support/reexport
+
+BUILT_SOURCES 	= $(GENFILES)
+
+noinst_HEADERS = mount.h
+
+dist-hook:
+	for f in $(GENFILES); do \
+	  rm ${distdir}/$$f; \
+	done
+
+if CONFIG_RPCGEN
+RPCGEN		= $(top_builddir)/tools/rpcgen/rpcgen
+$(RPCGEN):
+	make -C $(top_srcdir)/tools/rpcgen all
+else
+RPCGEN = @RPCGEN_PATH@
+endif
+
+$(GENFILES_CLNT): %_clnt.c: %.x $(RPCGEN)
+	test -f $@ && rm -rf $@ || true
+	$(RPCGEN) -l -o $@ $<
+
+$(GENFILES_XDR): %_xdr.c: %.x $(RPCGEN)
+	test -f $@ && rm -rf $@ || true
+	$(RPCGEN) -c -i 0 -o $@ $<
+
+$(GENFILES_H): %.h: %.x $(RPCGEN)
+	test -f $@ && rm -rf $@ || true
+	$(RPCGEN) -h -o $@ $<
+	rm -f $(top_builddir)/support/include/mount.h
+	$(LN_S) ../export/mount.h $(top_builddir)/support/include/mount.h
+
+MAINTAINERCLEANFILES = Makefile.in
+
+CLEANFILES = $(GENFILES) $(top_builddir)/support/include/mount.h
diff --git a/support/export/Makefile.in b/support/export/Makefile.in
new file mode 100644
index 0000000..6d8a25a
--- /dev/null
+++ b/support/export/Makefile.in
@@ -0,0 +1,934 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in 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.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
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+  fi; \
+}
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+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
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+host_triplet = @host@
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+am__aclocal_m4_deps = $(top_srcdir)/aclocal/ax_gcc_func_attribute.m4 \
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+	$(top_srcdir)/aclocal/libsqlite3.m4 \
+	$(top_srcdir)/aclocal/libtirpc.m4 \
+	$(top_srcdir)/aclocal/libxml2.m4 \
+	$(top_srcdir)/aclocal/nfs-utils.m4 \
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+	$(am__DIST_COMMON)
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+CONFIG_CLEAN_FILES =
+CONFIG_CLEAN_VPATH_FILES =
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+	libexport_a-export.$(OBJEXT) libexport_a-hostname.$(OBJEXT) \
+	libexport_a-xtab.$(OBJEXT) libexport_a-mount_clnt.$(OBJEXT) \
+	libexport_a-mount_xdr.$(OBJEXT) libexport_a-cache.$(OBJEXT) \
+	libexport_a-auth.$(OBJEXT) libexport_a-v4root.$(OBJEXT) \
+	libexport_a-fsloc.$(OBJEXT) libexport_a-v4clients.$(OBJEXT)
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+am__maybe_remake_depfiles = depfiles
+am__depfiles_remade = ./$(DEPDIR)/libexport_a-auth.Po \
+	./$(DEPDIR)/libexport_a-cache.Po \
+	./$(DEPDIR)/libexport_a-client.Po \
+	./$(DEPDIR)/libexport_a-export.Po \
+	./$(DEPDIR)/libexport_a-fsloc.Po \
+	./$(DEPDIR)/libexport_a-hostname.Po \
+	./$(DEPDIR)/libexport_a-mount_clnt.Po \
+	./$(DEPDIR)/libexport_a-mount_xdr.Po \
+	./$(DEPDIR)/libexport_a-v4clients.Po \
+	./$(DEPDIR)/libexport_a-v4root.Po \
+	./$(DEPDIR)/libexport_a-xtab.Po
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+EXTRA_DIST = mount.x
+noinst_LIBRARIES = libexport.a
+libexport_a_SOURCES = client.c export.c hostname.c \
+		      xtab.c mount_clnt.c mount_xdr.c \
+		      cache.c auth.c v4root.c fsloc.c \
+		      v4clients.c
+
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+@CONFIG_RPCGEN_TRUE@RPCGEN = $(top_builddir)/tools/rpcgen/rpcgen
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+	    *$$dep*) \
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu support/export/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu support/export/Makefile
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+	  *config.status*) \
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+clean-noinstLIBRARIES:
+	-test -z "$(noinst_LIBRARIES)" || rm -f $(noinst_LIBRARIES)
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+	$(AM_V_at)-rm -f libexport.a
+	$(AM_V_AR)$(libexport_a_AR) libexport.a $(libexport_a_OBJECTS) $(libexport_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libexport.a
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
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+distclean-compile:
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+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libexport_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libexport_a-v4root.o -MD -MP -MF $(DEPDIR)/libexport_a-v4root.Tpo -c -o libexport_a-v4root.o `test -f 'v4root.c' || echo '$(srcdir)/'`v4root.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libexport_a-v4root.Tpo $(DEPDIR)/libexport_a-v4root.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='v4root.c' object='libexport_a-v4root.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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+
+libexport_a-v4root.obj: v4root.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libexport_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libexport_a-v4root.obj -MD -MP -MF $(DEPDIR)/libexport_a-v4root.Tpo -c -o libexport_a-v4root.obj `if test -f 'v4root.c'; then $(CYGPATH_W) 'v4root.c'; else $(CYGPATH_W) '$(srcdir)/v4root.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libexport_a-v4root.Tpo $(DEPDIR)/libexport_a-v4root.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='v4root.c' object='libexport_a-v4root.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libexport_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libexport_a-v4root.obj `if test -f 'v4root.c'; then $(CYGPATH_W) 'v4root.c'; else $(CYGPATH_W) '$(srcdir)/v4root.c'; fi`
+
+libexport_a-fsloc.o: fsloc.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libexport_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libexport_a-fsloc.o -MD -MP -MF $(DEPDIR)/libexport_a-fsloc.Tpo -c -o libexport_a-fsloc.o `test -f 'fsloc.c' || echo '$(srcdir)/'`fsloc.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libexport_a-fsloc.Tpo $(DEPDIR)/libexport_a-fsloc.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='fsloc.c' object='libexport_a-fsloc.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libexport_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libexport_a-fsloc.o `test -f 'fsloc.c' || echo '$(srcdir)/'`fsloc.c
+
+libexport_a-fsloc.obj: fsloc.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libexport_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libexport_a-fsloc.obj -MD -MP -MF $(DEPDIR)/libexport_a-fsloc.Tpo -c -o libexport_a-fsloc.obj `if test -f 'fsloc.c'; then $(CYGPATH_W) 'fsloc.c'; else $(CYGPATH_W) '$(srcdir)/fsloc.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libexport_a-fsloc.Tpo $(DEPDIR)/libexport_a-fsloc.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='fsloc.c' object='libexport_a-fsloc.obj' libtool=no @AMDEPBACKSLASH@
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+
+libexport_a-v4clients.o: v4clients.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libexport_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libexport_a-v4clients.o -MD -MP -MF $(DEPDIR)/libexport_a-v4clients.Tpo -c -o libexport_a-v4clients.o `test -f 'v4clients.c' || echo '$(srcdir)/'`v4clients.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libexport_a-v4clients.Tpo $(DEPDIR)/libexport_a-v4clients.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='v4clients.c' object='libexport_a-v4clients.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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+
+libexport_a-v4clients.obj: v4clients.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libexport_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libexport_a-v4clients.obj -MD -MP -MF $(DEPDIR)/libexport_a-v4clients.Tpo -c -o libexport_a-v4clients.obj `if test -f 'v4clients.c'; then $(CYGPATH_W) 'v4clients.c'; else $(CYGPATH_W) '$(srcdir)/v4clients.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libexport_a-v4clients.Tpo $(DEPDIR)/libexport_a-v4clients.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='v4clients.c' object='libexport_a-v4clients.obj' libtool=no @AMDEPBACKSLASH@
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+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	$(am__define_uniq_tagged_files); \
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+	  if test $$# -gt 0; then \
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+	      $$unique; \
+	  fi; \
+	fi
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+	     $$unique
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+GTAGS:
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	$(MAKE) $(AM_MAKEFLAGS) \
+	  top_distdir="$(top_distdir)" distdir="$(distdir)" \
+	  dist-hook
+check-am: all-am
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+	$(MAKE) $(AM_MAKEFLAGS) check-am
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(BUILT_SOURCES)" || rm -f $(BUILT_SOURCES)
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
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+
+clean-am: clean-generic clean-libtool clean-noinstLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/libexport_a-auth.Po
+	-rm -f ./$(DEPDIR)/libexport_a-cache.Po
+	-rm -f ./$(DEPDIR)/libexport_a-client.Po
+	-rm -f ./$(DEPDIR)/libexport_a-export.Po
+	-rm -f ./$(DEPDIR)/libexport_a-fsloc.Po
+	-rm -f ./$(DEPDIR)/libexport_a-hostname.Po
+	-rm -f ./$(DEPDIR)/libexport_a-mount_clnt.Po
+	-rm -f ./$(DEPDIR)/libexport_a-mount_xdr.Po
+	-rm -f ./$(DEPDIR)/libexport_a-v4clients.Po
+	-rm -f ./$(DEPDIR)/libexport_a-v4root.Po
+	-rm -f ./$(DEPDIR)/libexport_a-xtab.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
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+
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+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/libexport_a-auth.Po
+	-rm -f ./$(DEPDIR)/libexport_a-cache.Po
+	-rm -f ./$(DEPDIR)/libexport_a-client.Po
+	-rm -f ./$(DEPDIR)/libexport_a-export.Po
+	-rm -f ./$(DEPDIR)/libexport_a-fsloc.Po
+	-rm -f ./$(DEPDIR)/libexport_a-hostname.Po
+	-rm -f ./$(DEPDIR)/libexport_a-mount_clnt.Po
+	-rm -f ./$(DEPDIR)/libexport_a-mount_xdr.Po
+	-rm -f ./$(DEPDIR)/libexport_a-v4clients.Po
+	-rm -f ./$(DEPDIR)/libexport_a-v4root.Po
+	-rm -f ./$(DEPDIR)/libexport_a-xtab.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
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+	mostlyclean-libtool
+
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+
+.MAKE: all check install install-am install-exec install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLIBRARIES \
+	cscopelist-am ctags ctags-am dist-hook distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+dist-hook:
+	for f in $(GENFILES); do \
+	  rm ${distdir}/$$f; \
+	done
+@CONFIG_RPCGEN_TRUE@$(RPCGEN):
+@CONFIG_RPCGEN_TRUE@	make -C $(top_srcdir)/tools/rpcgen all
+
+$(GENFILES_CLNT): %_clnt.c: %.x $(RPCGEN)
+	test -f $@ && rm -rf $@ || true
+	$(RPCGEN) -l -o $@ $<
+
+$(GENFILES_XDR): %_xdr.c: %.x $(RPCGEN)
+	test -f $@ && rm -rf $@ || true
+	$(RPCGEN) -c -i 0 -o $@ $<
+
+$(GENFILES_H): %.h: %.x $(RPCGEN)
+	test -f $@ && rm -rf $@ || true
+	$(RPCGEN) -h -o $@ $<
+	rm -f $(top_builddir)/support/include/mount.h
+	$(LN_S) ../export/mount.h $(top_builddir)/support/include/mount.h
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/support/export/auth.c b/support/export/auth.c
new file mode 100644
index 0000000..2d7960f
--- /dev/null
+++ b/support/export/auth.c
@@ -0,0 +1,320 @@
+/*
+ * utils/mountd/auth.c
+ *
+ * Authentication procedures for mountd.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "sockaddr.h"
+#include "misc.h"
+#include "nfslib.h"
+#include "exportfs.h"
+#include "export.h"
+#include "v4root.h"
+
+enum auth_error
+{
+  bad_path,
+  unknown_host,
+  no_entry,
+  not_exported,
+  illegal_port,
+  success
+};
+
+static void		auth_fixpath(char *path);
+static nfs_export my_exp;
+static nfs_client my_client;
+
+extern int use_ipaddr;
+
+/*
+void
+auth_init(void)
+{
+	auth_reload();
+}
+*/
+
+/*
+ * A client can match many different netgroups and it's tough to know
+ * beforehand whether it will. If the concatenated string of netgroup
+ * m_hostnames is >512 bytes, then enable the "use_ipaddr" mode. This
+ * makes mountd change how it matches a client ip address when a mount
+ * request comes in. It's more efficient at handling netgroups at the
+ * expense of larger kernel caches.
+ */
+static void
+check_useipaddr(void)
+{
+	nfs_client *clp;
+	int old_use_ipaddr = use_ipaddr;
+	unsigned int len = 0;
+
+	if (use_ipaddr > 1)
+		/* fixed - don't check */
+		return;
+
+	/* add length of m_hostname + 1 for the comma */
+	for (clp = clientlist[MCL_NETGROUP]; clp; clp = clp->m_next)
+		len += (strlen(clp->m_hostname) + 1);
+
+	if (len > (NFSCLNT_IDMAX / 2))
+		use_ipaddr = 1;
+	else
+		use_ipaddr = 0;
+
+	if (use_ipaddr != old_use_ipaddr)
+		cache_flush();
+}
+
+unsigned int
+auth_reload(void)
+{
+	struct stat		stb;
+	static ino_t		last_inode;
+	static int		last_fd = -1;
+	static unsigned int	counter;
+	int			fd;
+
+	if ((fd = open(etab.statefn, O_RDONLY)) < 0) {
+		xlog(L_FATAL, "couldn't open %s", etab.statefn);
+	} else if (fstat(fd, &stb) < 0) {
+		xlog(L_FATAL, "couldn't stat %s", etab.statefn);
+		close(fd);
+	} else if (last_fd != -1 && stb.st_ino == last_inode) {
+		/* We opened the etab file before, and its inode
+		 * number hasn't changed since then.
+		 */
+		close(fd);
+		return counter;
+	} else {
+		/* Need to process entries from the etab file.  Close
+		 * the file descriptor from the previous open (last_fd),
+		 * and keep the current file descriptor open to prevent
+		 * the file system reusing the current inode number
+		 * (last_inode).
+		 */
+		if (last_fd != -1)
+			close(last_fd);
+		last_fd = fd;
+		last_inode = stb.st_ino;
+	}
+
+	export_freeall();
+	memset(&my_client, 0, sizeof(my_client));
+	xtab_export_read();
+	check_useipaddr();
+	v4root_set();
+
+	++counter;
+
+	return counter;
+}
+
+static char *get_client_ipaddr_name(const struct sockaddr *caller)
+{
+	char buf[INET6_ADDRSTRLEN + 1];
+
+	buf[0] = '$';
+	host_ntop(caller, buf + 1, sizeof(buf) - 1);
+	return strdup(buf);
+}
+
+static char *
+get_client_hostname(const struct sockaddr *caller, struct addrinfo *ai,
+		enum auth_error *error)
+{
+	char *n;
+
+	if (use_ipaddr)
+		return get_client_ipaddr_name(caller);
+	n = client_compose(ai);
+	*error = unknown_host;
+	if (!n)
+		return NULL;
+	if (*n)
+		return n;
+	free(n);
+	return strdup("DEFAULT");
+}
+
+bool ipaddr_client_matches(nfs_export *exp, struct addrinfo *ai)
+{
+	return client_check(exp->m_client, ai);
+}
+
+bool namelist_client_matches(nfs_export *exp, char *dom)
+{
+	return client_member(dom, exp->m_client->m_hostname);
+}
+
+bool client_matches(nfs_export *exp, char *dom, struct addrinfo *ai)
+{
+	if (is_ipaddr_client(dom))
+		return ipaddr_client_matches(exp, ai);
+	return namelist_client_matches(exp, dom);
+}
+
+/* return static nfs_export with details filled in */
+static nfs_export *
+auth_authenticate_newcache(const struct sockaddr *caller,
+			   const char *path, struct addrinfo *ai,
+			   enum auth_error *error)
+{
+	nfs_export *exp;
+	int i;
+
+	free(my_client.m_hostname);
+
+	my_client.m_hostname = get_client_hostname(caller, ai, error);
+	if (my_client.m_hostname == NULL)
+		return NULL;
+
+	my_client.m_naddr = 1;
+	set_addrlist(&my_client, 0, caller);
+	my_exp.m_client = &my_client;
+
+	exp = NULL;
+	for (i = 0; !exp && i < MCL_MAXTYPES; i++)
+		for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+			if (strcmp(path, exp->m_export.e_path))
+				continue;
+			if (!client_matches(exp, my_client.m_hostname, ai))
+				continue;
+			if (exp->m_export.e_flags & NFSEXP_V4ROOT)
+				/* not acceptable for v[23] export */
+				continue;
+			break;
+		}
+	*error = not_exported;
+	if (!exp)
+		return NULL;
+
+	my_exp.m_export = exp->m_export;
+	exp = &my_exp;
+	return exp;
+}
+
+static nfs_export *
+auth_authenticate_internal(const struct sockaddr *caller, const char *path,
+		struct addrinfo *ai, enum auth_error *error)
+{
+	nfs_export *exp;
+
+	exp = auth_authenticate_newcache(caller, path, ai, error);
+	if (!exp)
+		return NULL;
+	if (!(exp->m_export.e_flags & NFSEXP_INSECURE_PORT) &&
+		     nfs_get_port(caller) >= IPPORT_RESERVED) {
+		*error = illegal_port;
+		return NULL;
+	}
+	*error = success;
+
+	return exp;
+}
+
+nfs_export *
+auth_authenticate(const char *what, const struct sockaddr *caller,
+		const char *path)
+{
+	nfs_export	*exp = NULL;
+	char		epath[MAXPATHLEN+1];
+	char		*p = NULL;
+	char		buf[INET6_ADDRSTRLEN];
+	struct addrinfo *ai = NULL;
+	enum auth_error	error = bad_path;
+
+	if (path[0] != '/') {
+		xlog(L_WARNING, "Bad path in %s request from %s: \"%s\"",
+			     what, host_ntop(caller, buf, sizeof(buf)), path);
+		return exp;
+	}
+
+	strncpy(epath, path, sizeof (epath) - 1);
+	epath[sizeof (epath) - 1] = '\0';
+	auth_fixpath(epath); /* strip duplicate '/' etc */
+
+	ai = client_resolve(caller);
+	if (ai == NULL)
+		return exp;
+
+	/* Try the longest matching exported pathname. */
+	while (1) {
+		exp = auth_authenticate_internal(caller, epath, ai, &error);
+		if (exp || (error != not_exported && error != no_entry))
+			break;
+		/* We have to treat the root, "/", specially. */
+		if (p == &epath[1]) break;
+		p = strrchr(epath, '/');
+		if (p == epath) p++;
+		*p = '\0';
+	}
+
+	host_ntop(caller, buf, sizeof(buf));
+	switch (error) {
+	case bad_path:
+		xlog(L_WARNING, "bad path in %s request from %s: \"%s\"",
+		     what, buf, path);
+		break;
+
+	case unknown_host:
+		xlog(L_WARNING, "refused %s request from %s for %s (%s): unmatched host",
+		     what, buf, path, epath);
+		break;
+
+	case no_entry:
+		xlog(L_WARNING, "refused %s request from %s for %s (%s): no export entry",
+		     what, buf, path, epath);
+		break;
+
+	case not_exported:
+		xlog(L_WARNING, "refused %s request from %s for %s (%s): not exported",
+		     what, buf, path, epath);
+		break;
+
+	case illegal_port:
+		xlog(L_WARNING, "refused %s request from %s for %s (%s): illegal port %u",
+		     what, buf, path, epath, nfs_get_port(caller));
+		break;
+
+	case success:
+		xlog(L_NOTICE, "authenticated %s request from %s:%u for %s (%s)",
+		     what, buf, nfs_get_port(caller), path, epath);
+		break;
+	default:
+		xlog(L_NOTICE, "%s request from %s:%u for %s (%s) gave %d",
+		     what, buf, nfs_get_port(caller), path, epath, error);
+	}
+
+	nfs_freeaddrinfo(ai);
+	return exp;
+}
+
+static void
+auth_fixpath(char *path)
+{
+	char	*sp, *cp;
+
+	for (sp = cp = path; *sp; sp++) {
+		if (*sp != '/' || sp[1] != '/')
+			*cp++ = *sp;
+	}
+	while (cp > path+1 && cp[-1] == '/')
+		cp--;
+	*cp = '\0';
+}
diff --git a/support/export/cache.c b/support/export/cache.c
new file mode 100644
index 0000000..6c0a44a
--- /dev/null
+++ b/support/export/cache.c
@@ -0,0 +1,1934 @@
+/*
+ * Handle communication with knfsd internal cache
+ *
+ * We open /proc/net/rpc/{auth.unix.ip,nfsd.export,nfsd.fh}/channel
+ * and listen for requests (using my_svc_run)
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/sysmacros.h>
+#include <sys/types.h>
+#include <sys/select.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <pwd.h>
+#include <grp.h>
+#include <mntent.h>
+#include "misc.h"
+#include "nfsd_path.h"
+#include "nfslib.h"
+#include "exportfs.h"
+#include "export.h"
+#include "pseudoflavors.h"
+#include "xcommon.h"
+#include "reexport.h"
+
+#ifdef HAVE_JUNCTION_SUPPORT
+#include "fsloc.h"
+#endif
+
+#ifdef USE_BLKID
+#include "blkid/blkid.h"
+#endif
+
+enum nfsd_fsid {
+	FSID_DEV = 0,
+	FSID_NUM,
+	FSID_MAJOR_MINOR,
+	FSID_ENCODE_DEV,
+	FSID_UUID4_INUM,
+	FSID_UUID8,
+	FSID_UUID16,
+	FSID_UUID16_INUM,
+};
+
+#undef is_mountpoint
+static int is_mountpoint(const char *path)
+{
+	return check_is_mountpoint(path, nfsd_path_lstat);
+}
+
+static ssize_t cache_read(int fd, char *buf, size_t len)
+{
+	return nfsd_path_read(fd, buf, len);
+}
+
+static ssize_t cache_write(int fd, const char *buf, size_t len)
+{
+	return nfsd_path_write(fd, buf, len);
+}
+
+static bool path_lookup_error(int err)
+{
+	switch (err) {
+	case ELOOP:
+	case ENAMETOOLONG:
+	case ENOENT:
+	case ENOTDIR:
+	case EACCES:
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * Support routines for text-based upcalls.
+ * Fields are separated by spaces.
+ * Fields are either mangled to quote space tab newline slosh with slosh
+ * or a hexified with a leading \x
+ * Record is terminated with newline.
+ *
+ */
+
+#define INITIAL_MANAGED_GROUPS 100
+
+extern int use_ipaddr;
+
+static void auth_unix_ip(int f)
+{
+	/* requests are
+	 *  class IP-ADDR
+	 * Ignore if class != "nfsd"
+	 * Otherwise find domainname and write back:
+	 *
+	 *  "nfsd" IP-ADDR expiry domainname
+	 */
+	char class[20];
+	char ipaddr[INET6_ADDRSTRLEN + 1];
+	char *client = NULL;
+	struct addrinfo *ai = NULL;
+	struct addrinfo *tmp = NULL;
+	char buf[RPC_CHAN_BUF_SIZE], *bp;
+	int blen;
+
+	blen = read(f, buf, sizeof(buf));
+	if (blen <= 0 || buf[blen-1] != '\n') return;
+	buf[blen-1] = 0;
+
+	xlog(D_CALL, "auth_unix_ip: inbuf '%s'", buf);
+
+	bp = buf;
+
+	if (qword_get(&bp, class, 20) <= 0 ||
+	    strcmp(class, "nfsd") != 0)
+		return;
+
+	if (qword_get(&bp, ipaddr, sizeof(ipaddr) - 1) <= 0)
+		return;
+
+	tmp = host_pton(ipaddr);
+	if (tmp == NULL)
+		return;
+
+	auth_reload();
+
+	/* addr is a valid address, find the domain name... */
+	ai = client_resolve(tmp->ai_addr);
+	if (ai) {
+		client = client_compose(ai);
+		nfs_freeaddrinfo(ai);
+	}
+	if (!client)
+		xlog(D_AUTH, "failed authentication for IP %s", ipaddr);
+	else if	(!use_ipaddr)
+		xlog(D_AUTH, "successful authentication for IP %s as %s",
+		     ipaddr, *client ? client : "DEFAULT");
+	else
+		xlog(D_AUTH, "successful authentication for IP %s",
+			     ipaddr);
+
+	bp = buf; blen = sizeof(buf);
+	qword_add(&bp, &blen, "nfsd");
+	qword_add(&bp, &blen, ipaddr);
+	qword_adduint(&bp, &blen, time(0) + default_ttl);
+	if (use_ipaddr && client) {
+		memmove(ipaddr + 1, ipaddr, strlen(ipaddr) + 1);
+		ipaddr[0] = '$';
+		qword_add(&bp, &blen, ipaddr);
+	} else if (client)
+		qword_add(&bp, &blen, *client?client:"DEFAULT");
+	qword_addeol(&bp, &blen);
+	if (blen <= 0 || write(f, buf, bp - buf) != bp - buf)
+		xlog(L_ERROR, "auth_unix_ip: error writing reply");
+
+	xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, client?client: "DEFAULT");
+
+	free(client);
+	nfs_freeaddrinfo(tmp);
+
+}
+
+static void auth_unix_gid(int f)
+{
+	/* Request are
+	 *  uid
+	 * reply is
+	 *  uid expiry count list of group ids
+	 */
+	uid_t uid;
+	struct passwd *pw;
+	static gid_t *groups = NULL;
+	static int groups_len = 0;
+	gid_t *more_groups;
+	int ngroups;
+	int rv, i;
+	char buf[RPC_CHAN_BUF_SIZE], *bp;
+	int blen;
+
+	if (groups_len == 0) {
+		groups = malloc(sizeof(gid_t) * INITIAL_MANAGED_GROUPS);
+		if (!groups)
+			return;
+
+		groups_len = INITIAL_MANAGED_GROUPS;
+	}
+
+	ngroups = groups_len;
+
+	blen = read(f, buf, sizeof(buf));
+	if (blen <= 0 || buf[blen-1] != '\n') return;
+	buf[blen-1] = 0;
+
+	bp = buf;
+	if (qword_get_uint(&bp, &uid) != 0)
+		return;
+
+	pw = getpwuid(uid);
+	if (!pw)
+		rv = -1;
+	else {
+		rv = getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
+		if (rv == -1 && ngroups >= groups_len) {
+			more_groups = realloc(groups, sizeof(gid_t)*ngroups);
+			if (!more_groups)
+				rv = -1;
+			else {
+				groups = more_groups;
+				groups_len = ngroups;
+				rv = getgrouplist(pw->pw_name, pw->pw_gid,
+						  groups, &ngroups);
+			}
+		}
+	}
+
+	bp = buf; blen = sizeof(buf);
+	qword_adduint(&bp, &blen, uid);
+	qword_adduint(&bp, &blen, time(0) + default_ttl);
+	if (rv >= 0) {
+		qword_adduint(&bp, &blen, ngroups);
+		for (i=0; i<ngroups; i++)
+			qword_adduint(&bp, &blen, groups[i]);
+	} else
+		qword_adduint(&bp, &blen, 0);
+	qword_addeol(&bp, &blen);
+	if (blen <= 0 || write(f, buf, bp - buf) != bp - buf)
+		xlog(L_ERROR, "auth_unix_gid: error writing reply");
+}
+
+static int match_crossmnt_fsidnum(uint32_t parsed_fsidnum, char *path)
+{
+	uint32_t fsidnum;
+
+	if (reexpdb_fsidnum_by_path(path, &fsidnum, 0) == 0)
+		return 0;
+
+	return fsidnum == parsed_fsidnum;
+}
+
+#ifdef USE_BLKID
+static const char *get_uuid_blkdev(char *path)
+{
+	/* We set *safe if we know that we need the
+	 * fsid from statfs too.
+	 */
+	static blkid_cache cache = NULL;
+	struct stat stb;
+	char *devname;
+	blkid_tag_iterate iter;
+	blkid_dev dev;
+	const char *type;
+	const char *val, *uuid = NULL;
+
+	if (cache == NULL)
+		blkid_get_cache(&cache, NULL);
+
+	if (nfsd_path_stat(path, &stb) != 0)
+		return NULL;
+	devname = blkid_devno_to_devname(stb.st_dev);
+	if (!devname)
+		return NULL;
+	dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
+	free(devname);
+	if (!dev)
+		return NULL;
+	iter = blkid_tag_iterate_begin(dev);
+	if (!iter)
+		return NULL;
+	while (blkid_tag_next(iter, &type, &val) == 0) {
+		if (strcmp(type, "UUID") == 0)
+			uuid = val;
+		if (strcmp(type, "TYPE") == 0 &&
+		    strcmp(val, "btrfs") == 0) {
+			uuid = NULL;
+			break;
+		}
+	}
+	blkid_tag_iterate_end(iter);
+	return uuid;
+}
+#else
+#define get_uuid_blkdev(path) (NULL)
+#endif
+
+static int get_uuid(const char *val, size_t uuidlen, char *u)
+{
+	/* extract hex digits from uuidstr and compose a uuid
+	 * of the given length (max 16), xoring bytes to make
+	 * a smaller uuid.
+	 */
+	size_t i = 0;
+	
+	memset(u, 0, uuidlen);
+	for ( ; *val ; val++) {
+		int c = *val;
+		if (!isxdigit(c))
+			continue;
+		if (isalpha(c)) {
+			if (isupper(c))
+				c = c - 'A' + 10;
+			else
+				c = c - 'a' + 10;
+		} else
+			c = c - '0' + 0;
+		if ((i&1) == 0)
+			c <<= 4;
+		u[i/2] ^= (char)c;
+		i++;
+		if (i == uuidlen*2)
+			i = 0;
+	}
+	return 1;
+}
+
+
+/*
+ * Don't ask libblkid for these filesystems. Note that BTRF is ignored, because
+ * we generate the identifier from statfs->f_fsid. The rest are network or
+ * pseudo filesystems. (See <linux/magic.h> for the basic IDs.)
+ */
+static const unsigned long nonblkid_filesystems[] = {
+    0x2fc12fc1,    /* ZFS_SUPER_MAGIC */
+    0x9123683E,    /* BTRFS_SUPER_MAGIC */
+    0xFF534D42,    /* CIFS_MAGIC_NUMBER */
+    0x1373,        /* DEVFS_SUPER_MAGIC */
+    0x73757245,    /* CODA_SUPER_MAGIC */
+    0x564C,        /* NCP_SUPER_MAGIC */
+    0x6969,        /* NFS_SUPER_MAGIC */
+    0x9FA0,        /* PROC_SUPER_MAGIC */
+    0x62656572,    /* SYSFS_MAGIC */
+    0x517B,        /* SMB_SUPER_MAGIC */
+    0x01021994,    /* TMPFS_SUPER_MAGIC */
+    0        /* last */
+};
+
+static int uuid_by_path(char *path, int type, size_t uuidlen, char *uuid)
+{
+	/* get a uuid for the filesystem found at 'path'.
+	 * There are several possible ways of generating the
+	 * uuids (types).
+	 * Type 0 is used for new filehandles, while other types
+	 * may be used to interpret old filehandle - to ensure smooth
+	 * forward migration.
+	 * We return 1 if a uuid was found (and it might be worth 
+	 * trying the next type) or 0 if no more uuid types can be
+	 * extracted.
+	 */
+
+	/* Possible sources of uuid are
+	 * - blkid uuid
+	 * - statfs uuid
+	 *
+	 * On some filesystems (e.g. vfat) the statfs uuid is simply an
+	 * encoding of the device that the filesystem is mounted from, so
+	 * it we be very bad to use that (as device numbers change).  blkid
+	 * must be preferred.
+	 * On other filesystems (e.g. btrfs) the statfs uuid contains
+	 * important info that the blkid uuid cannot contain:  This happens
+	 * when multiple subvolumes are exported (they have the same
+	 * blkid uuid but different statfs uuids).
+	 * We rely on get_uuid_blkdev *knowing* which is which and not returning
+	 * a uuid for filesystems where the statfs uuid is better.
+	 *
+	 */
+	struct statfs st;
+	char fsid_val[17];
+	const char *blkid_val = NULL;
+	const char *val;
+	int rc;
+
+	rc = nfsd_path_statfs(path, &st);
+
+	if (type == 0 && rc == 0) {
+		const unsigned long *bad;
+		for (bad = nonblkid_filesystems; *bad; bad++) {
+			if (*bad == (unsigned long)st.f_type)
+				break;
+		}
+		if (*bad == 0)
+			blkid_val = get_uuid_blkdev(path);
+	}
+
+	if (rc == 0 &&
+	    (st.f_fsid.__val[0] || st.f_fsid.__val[1]))
+		snprintf(fsid_val, 17, "%08x%08x",
+			 st.f_fsid.__val[0], st.f_fsid.__val[1]);
+	else
+		fsid_val[0] = 0;
+
+	if (blkid_val && (type--) == 0)
+		val = blkid_val;
+	else if (fsid_val[0] && (type--) == 0)
+		val = fsid_val;
+	else
+		return 0;
+
+	get_uuid(val, uuidlen, uuid);
+	return 1;
+}
+
+/* Iterate through /etc/mtab, finding mountpoints
+ * at or below a given path
+ */
+static char *next_mnt(void **v, char *p)
+{
+	FILE *f;
+	struct mntent *me;
+	size_t l = strlen(p);
+
+	if (*v == NULL) {
+		f = setmntent("/etc/mtab", "r");
+		*v = f;
+	} else
+		f = *v;
+	while ((me = getmntent(f)) != NULL && l >= 1) {
+		char *mnt_dir = nfsd_path_strip_root(me->mnt_dir);
+
+		if (!mnt_dir)
+			continue;
+
+		/* Everything below "/" is a proper sub-mount */
+		if (strcmp(p, "/") == 0)
+			return mnt_dir;
+
+		if (strncmp(mnt_dir, p, l) == 0 && mnt_dir[l] == '/')
+			return mnt_dir;
+	}
+	endmntent(f);
+	*v = NULL;
+	return NULL;
+}
+
+/* same_path() check is two paths refer to the same directory.
+ * We don't rely on 'strcmp()' as some filesystems support case-insensitive
+ * names and we might have two different names for the one directory.
+ * Theoretically the lengths of the names could be different, but the
+ * number of components must be the same.
+ * So if the paths have the same number of components (but aren't identical)
+ * we ask the kernel if they are the same thing.
+ * By preference we use name_to_handle_at(), as the mntid it returns
+ * will distinguish between bind-mount points.  If that isn't available
+ * we fall back on lstat, which is usually good enough.
+ */
+static inline int count_slashes(char *p)
+{
+	int cnt = 0;
+	while (*p)
+		if (*p++ == '/')
+			cnt++;
+	return cnt;
+}
+
+#if defined(HAVE_STRUCT_FILE_HANDLE)
+static int check_same_path_by_handle(const char *child, const char *parent)
+{
+	struct {
+		struct file_handle fh;
+		unsigned char handle[128];
+	} fchild, fparent;
+	int mnt_child, mnt_parent;
+
+	fchild.fh.handle_bytes = 128;
+	fparent.fh.handle_bytes = 128;
+
+	/* This process should have the CAP_DAC_READ_SEARCH capability */
+	if (nfsd_name_to_handle_at(AT_FDCWD, child, &fchild.fh, &mnt_child, 0) < 0)
+		return -1;
+	if (nfsd_name_to_handle_at(AT_FDCWD, parent, &fparent.fh, &mnt_parent, 0) < 0) {
+		/* If the child resolved, but the parent did not, they differ */
+		if (path_lookup_error(errno))
+			return 0;
+		/* Otherwise, we just don't know */
+		return -1;
+	}
+
+	if (mnt_child != mnt_parent ||
+	    fchild.fh.handle_bytes != fparent.fh.handle_bytes ||
+	    fchild.fh.handle_type != fparent.fh.handle_type ||
+	    memcmp(fchild.handle, fparent.handle,
+		   fchild.fh.handle_bytes) != 0)
+		return 0;
+
+	return 1;
+}
+#else
+static int check_same_path_by_handle(const char *child, const char *parent)
+{
+	errno = ENOSYS;
+	return -1;
+}
+#endif
+
+static int check_same_path_by_inode(const char *child, const char *parent)
+{
+	struct stat sc, sp;
+
+	/* This is nearly good enough.  However if a directory is
+	 * bind-mounted in two places and both are exported, it
+	 * could give a false positive
+	 */
+	if (nfsd_path_lstat(child, &sc) != 0)
+		return 0;
+	if (nfsd_path_lstat(parent, &sp) != 0)
+		return 0;
+	if (sc.st_dev != sp.st_dev)
+		return 0;
+	if (sc.st_ino != sp.st_ino)
+		return 0;
+
+	return 1;
+}
+
+static int same_path(char *child, char *parent, int len)
+{
+	static char p[PATH_MAX];
+	int err;
+
+	if (len <= 0)
+		len = strlen(child);
+	strncpy(p, child, len);
+	p[len] = 0;
+	if (strcmp(p, parent) == 0)
+		return 1;
+
+	/* If number of '/' are different, they must be different */
+	if (count_slashes(p) != count_slashes(parent))
+		return 0;
+
+	/* Try to use filehandle approach before falling back to stat() */
+	err = check_same_path_by_handle(p, parent);
+	if (err != -1)
+		return err;
+	return check_same_path_by_inode(p, parent);
+}
+
+static int is_subdirectory(char *child, char *parent)
+{
+	/* Check is child is strictly a subdirectory of
+	 * parent or a more distant descendant.
+	 */
+	size_t l = strlen(parent);
+
+	if (strcmp(parent, "/") == 0 && child[1] != 0)
+		return 1;
+
+	return (same_path(child, parent, l) && child[l] == '/');
+}
+
+static int path_matches(nfs_export *exp, char *path)
+{
+	/* Does the path match the export?  I.e. is it an
+	 * exact match, or does the export have CROSSMOUNT, and path
+	 * is a descendant?
+	 */
+	return same_path(path, exp->m_export.e_path, 0)
+		|| ((exp->m_export.e_flags & NFSEXP_CROSSMOUNT)
+		    && is_subdirectory(path, exp->m_export.e_path));
+}
+
+static int
+export_matches(nfs_export *exp, char *dom, char *path, struct addrinfo *ai)
+{
+	return path_matches(exp, path) && client_matches(exp, dom, ai);
+}
+
+/* True iff e1 is a child of e2 (or descendant) and e2 has crossmnt set: */
+static bool subexport(struct exportent *e1, struct exportent *e2)
+{
+	char *p1 = e1->e_path, *p2 = e2->e_path;
+
+	return e2->e_flags & NFSEXP_CROSSMOUNT
+		&& is_subdirectory(p1, p2);
+}
+
+struct parsed_fsid {
+	int fsidtype;
+	/* We could use a union for this, but it would be more
+	 * complicated; why bother? */
+	uint64_t inode;
+	unsigned int minor;
+	unsigned int major;
+	uint32_t fsidnum;
+	size_t uuidlen;
+	char *fhuuid;
+};
+
+static int parse_fsid(int fsidtype, int fsidlen, char *fsid,
+		struct parsed_fsid *parsed)
+{
+	uint32_t dev;
+	uint32_t inode32;
+
+	memset(parsed, 0, sizeof(*parsed));
+	parsed->fsidtype = fsidtype;
+	switch(fsidtype) {
+	case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */
+		if (fsidlen != 8)
+			return -1;
+		memcpy(&dev, fsid, 4);
+		memcpy(&inode32, fsid+4, 4);
+		parsed->inode = inode32;
+		parsed->major = ntohl(dev)>>16;
+		parsed->minor = ntohl(dev) & 0xFFFF;
+		break;
+
+	case FSID_NUM: /* 4 bytes - fsid */
+		if (fsidlen != 4)
+			return -1;
+		memcpy(&parsed->fsidnum, fsid, 4);
+		break;
+
+	case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode
+		 * This format is never actually used but was
+		 * an historical accident
+		 */
+		if (fsidlen != 12)
+			return -1;
+		memcpy(&dev, fsid, 4);
+		parsed->major = ntohl(dev);
+		memcpy(&dev, fsid+4, 4);
+		parsed->minor = ntohl(dev);
+		memcpy(&inode32, fsid+8, 4);
+		parsed->inode = inode32;
+		break;
+
+	case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */
+		/* This is *host* endian, not net-byte-order, because
+		 * no-one outside this host has any business interpreting it
+		 */
+		if (fsidlen != 8)
+			return -1;
+		memcpy(&dev, fsid, 4);
+		memcpy(&inode32, fsid+4, 4);
+		parsed->inode = inode32;
+		parsed->major = (dev & 0xfff00) >> 8;
+		parsed->minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
+		break;
+
+	case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */
+		if (fsidlen != 8)
+			return -1;
+		memcpy(&inode32, fsid, 4);
+		parsed->inode = inode32;
+		parsed->uuidlen = 4;
+		parsed->fhuuid = fsid+4;
+		break;
+	case FSID_UUID8: /* 8 byte uuid */
+		if (fsidlen != 8)
+			return -1;
+		parsed->uuidlen = 8;
+		parsed->fhuuid = fsid;
+		break;
+	case FSID_UUID16: /* 16 byte uuid */
+		if (fsidlen != 16)
+			return -1;
+		parsed->uuidlen = 16;
+		parsed->fhuuid = fsid;
+		break;
+	case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */
+		if (fsidlen != 24)
+			return -1;
+		memcpy(&parsed->inode, fsid, 8);
+		parsed->uuidlen = 16;
+		parsed->fhuuid = fsid+8;
+		break;
+	}
+	return 0;
+}
+
+static int match_fsid(struct parsed_fsid *parsed, nfs_export *exp, char *path)
+{
+	struct stat stb;
+	int type;
+	char u[16];
+
+	if (nfsd_path_stat(path, &stb) != 0)
+		goto path_error;
+	if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode))
+		goto nomatch;
+
+	switch (parsed->fsidtype) {
+	case FSID_DEV:
+	case FSID_MAJOR_MINOR:
+	case FSID_ENCODE_DEV:
+		if (stb.st_ino != parsed->inode)
+			goto nomatch;
+		if (parsed->major != major(stb.st_dev) ||
+		    parsed->minor != minor(stb.st_dev))
+			goto nomatch;
+		goto match;
+	case FSID_NUM:
+		if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
+		     exp->m_export.e_fsid != parsed->fsidnum)) {
+			if ((exp->m_export.e_flags & NFSEXP_CROSSMOUNT) && exp->m_export.e_reexport != REEXP_NONE &&
+			    match_crossmnt_fsidnum(parsed->fsidnum, path))
+				goto match;
+
+			goto nomatch;
+		}
+		goto match;
+	case FSID_UUID4_INUM:
+	case FSID_UUID16_INUM:
+		if (stb.st_ino != parsed->inode)
+			goto nomatch;
+		goto check_uuid;
+	case FSID_UUID8:
+	case FSID_UUID16:
+		errno = 0;
+		if (!is_mountpoint(path)) {
+			if (!errno)
+				goto nomatch;
+			goto path_error;
+		}
+	check_uuid:
+		if (exp->m_export.e_uuid) {
+			get_uuid(exp->m_export.e_uuid, parsed->uuidlen, u);
+			if (memcmp(u, parsed->fhuuid, parsed->uuidlen) == 0)
+				goto match;
+		}
+		else
+			for (type = 0;
+			     uuid_by_path(path, type, parsed->uuidlen, u);
+			     type++)
+				if (memcmp(u, parsed->fhuuid, parsed->uuidlen) == 0)
+					goto match;
+	}
+nomatch:
+	return 0;
+match:
+	return 1;
+path_error:
+	if (path_lookup_error(errno))
+		goto nomatch;
+	return -1;
+}
+
+static struct addrinfo *lookup_client_addr(char *dom)
+{
+	struct addrinfo *ret;
+	struct addrinfo *tmp;
+
+	dom++; /* skip initial "$" */
+
+	tmp = host_pton(dom);
+	if (tmp == NULL)
+		return NULL;
+	ret = client_resolve(tmp->ai_addr);
+	nfs_freeaddrinfo(tmp);
+	return ret;
+}
+
+#define RETRY_SEC 120
+struct delayed {
+	char *message;
+	time_t last_attempt;
+	int f;
+	struct delayed *next;
+} *delayed;
+
+static int nfsd_handle_fh(int f, char *bp, int blen)
+{
+	/* request are:
+	 *  domain fsidtype fsid
+	 * interpret fsid, find export point and options, and write:
+	 *  domain fsidtype fsid expiry path
+	 */
+	char *dom;
+	int fsidtype;
+	int fsidlen;
+	char fsid[32];
+	struct parsed_fsid parsed;
+	struct exportent *found = NULL;
+	struct addrinfo *ai = NULL;
+	char *found_path = NULL;
+	nfs_export *exp;
+	int i;
+	int dev_missing = 0;
+	char buf[RPC_CHAN_BUF_SIZE];
+	int did_uncover = 0;
+	int ret = 0;
+
+	dom = malloc(blen);
+	if (dom == NULL)
+		return ret;
+	if (qword_get(&bp, dom, blen) <= 0)
+		goto out;
+	if (qword_get_int(&bp, &fsidtype) != 0)
+		goto out;
+	if (fsidtype < 0 || fsidtype > 7)
+		goto out; /* unknown type */
+	if ((fsidlen = qword_get(&bp, fsid, 32)) <= 0)
+		goto out;
+	if (parse_fsid(fsidtype, fsidlen, fsid, &parsed))
+		goto out;
+
+	auth_reload();
+
+	if (is_ipaddr_client(dom)) {
+		ai = lookup_client_addr(dom);
+		if (!ai)
+			goto out;
+	}
+
+	/* Now determine export point for this fsid/domain */
+	for (i=0 ; i < MCL_MAXTYPES; i++) {
+		nfs_export *next_exp;
+		for (exp = exportlist[i].p_head; exp; exp = next_exp) {
+			char *path;
+
+			if (!did_uncover && parsed.fsidnum && parsed.fsidtype == FSID_NUM && exp->m_export.e_reexport != REEXP_NONE) {
+				reexpdb_uncover_subvolume(parsed.fsidnum);
+				did_uncover = 1;
+			}
+
+			if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
+				static nfs_export *prev = NULL;
+				static void *mnt = NULL;
+				
+				if (prev == exp) {
+					/* try a submount */
+					path = next_mnt(&mnt, exp->m_export.e_path);
+					if (!path) {
+						next_exp = exp->m_next;
+						prev = NULL;
+						continue;
+					}
+					next_exp = exp;
+				} else {
+					prev = exp;
+					mnt = NULL;
+					path = exp->m_export.e_path;
+					next_exp = exp;
+				}
+			} else {
+				path = exp->m_export.e_path;
+				next_exp = exp->m_next;
+			}
+
+			if (!is_ipaddr_client(dom)
+					&& !namelist_client_matches(exp, dom))
+				continue;
+			if (exp->m_export.e_mountpoint &&
+			    !is_mountpoint(exp->m_export.e_mountpoint[0]?
+					   exp->m_export.e_mountpoint:
+					   exp->m_export.e_path))
+				dev_missing ++;
+
+			switch(match_fsid(&parsed, exp, path)) {
+			case 0:
+				continue;
+			case -1:
+				dev_missing ++;
+				continue;
+			}
+			if (is_ipaddr_client(dom)
+					&& !ipaddr_client_matches(exp, ai))
+				continue;
+			if (!found || subexport(&exp->m_export, found)) {
+				found = &exp->m_export;
+				free(found_path);
+				found_path = strdup(path);
+				if (found_path == NULL)
+					goto out;
+			} else if (strcmp(found->e_path, exp->m_export.e_path) != 0
+				   && !subexport(found, &exp->m_export))
+			{
+				xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
+				     found_path, path, dom);
+			} else {
+				/* same path, if one is V4ROOT, choose the other */
+				if (found->e_flags & NFSEXP_V4ROOT) {
+					found = &exp->m_export;
+					free(found_path);
+					found_path = strdup(path);
+					if (found_path == NULL)
+						goto out;
+				}
+			}
+		}
+	}
+
+	if (!found) {
+		/* The missing dev could be what we want, so just be
+		 * quiet rather than returning stale yet
+		 */
+		if (dev_missing) {
+			ret = 1;
+			goto out;
+		}
+	} else if (found->e_mountpoint &&
+	    !is_mountpoint(found->e_mountpoint[0]?
+			   found->e_mountpoint:
+			   found->e_path)) {
+		/* Cannot export this yet
+		 * should log a warning, but need to rate limit
+		   xlog(L_WARNING, "%s not exported as %d not a mountpoint",
+		   found->e_path, found->e_mountpoint);
+		 */
+		ret = 1;
+		goto out;
+	}
+
+	bp = buf; blen = sizeof(buf);
+	qword_add(&bp, &blen, dom);
+	qword_addint(&bp, &blen, fsidtype);
+	qword_addhex(&bp, &blen, fsid, fsidlen);
+	/* The fsid -> path lookup can be quite expensive as it
+	 * potentially stats and reads lots of devices, and some of those
+	 * might have spun-down.  The Answer is not likely to
+	 * change underneath us, and an 'exportfs -f' can always
+	 * remove this from the kernel, so use a really log
+	 * timeout.  Maybe this should be configurable on the command
+	 * line.
+	 */
+	qword_addint(&bp, &blen, 0x7fffffff);
+	if (found)
+		qword_add(&bp, &blen, found_path);
+	qword_addeol(&bp, &blen);
+	if (blen <= 0 || cache_write(f, buf, bp - buf) != bp - buf)
+		xlog(L_ERROR, "nfsd_fh: error writing reply");
+	if (!found)
+		xlog(D_AUTH, "denied access to %s", *dom == '$' ? dom+1 : dom);
+out:
+	if (found_path)
+		free(found_path);
+	nfs_freeaddrinfo(ai);
+	free(dom);
+	if (!ret)
+		xlog(D_CALL, "nfsd_fh: found %p path %s",
+		     found, found ? found->e_path : NULL);
+	return ret;
+}
+
+static void nfsd_fh(int f)
+{
+	struct delayed *d, **dp;
+	char inbuf[RPC_CHAN_BUF_SIZE];
+	int blen;
+
+	blen = cache_read(f, inbuf, sizeof(inbuf));
+	if (blen <= 0 || inbuf[blen-1] != '\n') return;
+	inbuf[blen-1] = 0;
+
+	xlog(D_CALL, "nfsd_fh: inbuf '%s'", inbuf);
+
+	if (nfsd_handle_fh(f, inbuf, blen) == 0)
+		return;
+	/* We don't have a definitive answer to give the kernel.
+	 * This is because an export marked "mountpoint" isn't a
+	 * mountpoint, or because a stat of a mountpoint fails with
+	 * a strange error like ETIMEDOUT as is possible with an
+	 * NFS mount marked "softerr" which is being re-exported.
+	 *
+	 * We cannot tell the kernel to retry, so we have to
+	 * retry ourselves.
+	 */
+	d = malloc(sizeof(*d));
+
+	if (!d)
+		return;
+	d->message = strndup(inbuf, blen);
+	if (!d->message) {
+		free(d);
+		return;
+	}
+	d->f = f;
+	d->last_attempt = time(NULL);
+	d->next = NULL;
+	dp = &delayed;
+	while (*dp)
+		dp = &(*dp)->next;
+	*dp = d;
+}
+
+static void nfsd_retry_fh(struct delayed *d)
+{
+	struct delayed **dp;
+
+	if (nfsd_handle_fh(d->f, d->message, strlen(d->message)+1) == 0) {
+		free(d->message);
+		free(d);
+		return;
+	}
+	d->last_attempt = time(NULL);
+	d->next = NULL;
+	dp = &delayed;
+	while (*dp)
+		dp = &(*dp)->next;
+	*dp = d;
+}
+
+#ifdef HAVE_JUNCTION_SUPPORT
+static void write_fsloc(char **bp, int *blen, struct exportent *ep)
+{
+	struct servers *servers;
+
+	if (ep->e_fslocmethod == FSLOC_NONE)
+		return;
+
+	servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata);
+	if (!servers)
+		return;
+	qword_add(bp, blen, "fsloc");
+	qword_addint(bp, blen, servers->h_num);
+	if (servers->h_num >= 0) {
+		int i;
+		for (i=0; i<servers->h_num; i++) {
+			qword_add(bp, blen, servers->h_mp[i]->h_host);
+			qword_add(bp, blen, servers->h_mp[i]->h_path);
+		}
+	}
+	qword_addint(bp, blen, servers->h_referral);
+	release_replicas(servers);
+}
+#endif
+
+static void write_secinfo(char **bp, int *blen, struct exportent *ep, int flag_mask, int extra_flag)
+{
+	struct sec_entry *p;
+
+	for (p = ep->e_secinfo; p->flav; p++)
+		; /* Do nothing */
+	if (p == ep->e_secinfo) {
+		/* There was no sec= option */
+		return;
+	}
+	fix_pseudoflavor_flags(ep);
+	qword_add(bp, blen, "secinfo");
+	qword_addint(bp, blen, p - ep->e_secinfo);
+	for (p = ep->e_secinfo; p->flav; p++) {
+		qword_addint(bp, blen, p->flav->fnum);
+		qword_addint(bp, blen, (p->flags | extra_flag) & flag_mask);
+	}
+}
+
+static void write_xprtsec(char **bp, int *blen, struct exportent *ep)
+{
+	struct xprtsec_entry *p;
+
+	for (p = ep->e_xprtsec; p->info; p++);
+	if (p == ep->e_xprtsec)
+		return;
+
+	qword_add(bp, blen, "xprtsec");
+	qword_addint(bp, blen, p - ep->e_xprtsec);
+	for (p = ep->e_xprtsec; p->info; p++)
+		qword_addint(bp, blen, p->info->number);
+}
+
+static int can_reexport_via_fsidnum(struct exportent *exp, struct statfs *st)
+{
+	if (st->f_type != 0x6969 /* NFS_SUPER_MAGIC */)
+		return 0;
+
+	return exp->e_reexport == REEXP_PREDEFINED_FSIDNUM ||
+	       exp->e_reexport == REEXP_AUTO_FSIDNUM;
+}
+
+static int dump_to_cache(int f, char *buf, int blen, char *domain,
+			 char *path, struct exportent *exp, int ttl)
+{
+	char *bp = buf;
+	time_t now = time(0);
+	size_t buflen;
+	ssize_t err;
+
+	if (ttl <= 1)
+		ttl = default_ttl;
+
+	qword_add(&bp, &blen, domain);
+	qword_add(&bp, &blen, path);
+	if (exp) {
+		int different_fs = strcmp(path, exp->e_path) != 0;
+		int flag_mask = different_fs ? ~NFSEXP_FSID : ~0;
+		int rc, do_fsidnum = 0;
+		uint32_t fsidnum = exp->e_fsid;
+
+		if (different_fs) {
+			struct statfs st;
+
+			rc = nfsd_path_statfs(path, &st);
+			if (rc) {
+				xlog(L_WARNING, "unable to statfs %s", path);
+				errno = EINVAL;
+				return -1;
+			}
+
+			if (can_reexport_via_fsidnum(exp, &st)) {
+				do_fsidnum = 1;
+				flag_mask = ~0;
+			}
+		}
+
+		qword_adduint(&bp, &blen, now + exp->e_ttl);
+
+		if (do_fsidnum) {
+			uint32_t search_fsidnum = 0;
+			if (exp->e_reexport != REEXP_NONE && reexpdb_fsidnum_by_path(path, &search_fsidnum,
+			    exp->e_reexport == REEXP_AUTO_FSIDNUM) == 0) {
+				errno = EINVAL;
+				return -1;
+			}
+			fsidnum = search_fsidnum;
+			qword_addint(&bp, &blen, exp->e_flags | NFSEXP_FSID);
+		} else {
+			qword_addint(&bp, &blen, exp->e_flags & flag_mask);
+		}
+
+		qword_addint(&bp, &blen, exp->e_anonuid);
+		qword_addint(&bp, &blen, exp->e_anongid);
+		qword_addint(&bp, &blen, fsidnum);
+
+#ifdef HAVE_JUNCTION_SUPPORT
+		write_fsloc(&bp, &blen, exp);
+#endif
+		write_secinfo(&bp, &blen, exp, flag_mask, do_fsidnum ? NFSEXP_FSID : 0);
+		if (exp->e_uuid == NULL || different_fs) {
+			char u[16];
+			if ((exp->e_flags & flag_mask & NFSEXP_FSID) == 0 &&
+			    uuid_by_path(path, 0, 16, u)) {
+				qword_add(&bp, &blen, "uuid");
+				qword_addhex(&bp, &blen, u, 16);
+			}
+		} else {
+			char u[16];
+			get_uuid(exp->e_uuid, 16, u);
+			qword_add(&bp, &blen, "uuid");
+			qword_addhex(&bp, &blen, u, 16);
+		}
+		write_xprtsec(&bp, &blen, exp);
+		xlog(D_AUTH, "granted access to %s for %s",
+		     path, *domain == '$' ? domain+1 : domain);
+	} else {
+		qword_adduint(&bp, &blen, now + ttl);
+		xlog(D_AUTH, "denied access to %s for %s",
+		     path, *domain == '$' ? domain+1 : domain);
+	}
+	qword_addeol(&bp, &blen);
+	if (blen <= 0) {
+		errno = ENOBUFS;
+		return -1;
+	}
+	buflen = bp - buf;
+	err = cache_write(f, buf, buflen);
+	if (err < 0)
+		return err;
+	if ((size_t)err != buflen) {
+		errno = ENOSPC;
+		return -1;
+	}
+	return 0;
+}
+
+static nfs_export *
+lookup_export(char *dom, char *path, struct addrinfo *ai)
+{
+	nfs_export *exp;
+	nfs_export *found = NULL;
+	int found_type = 0;
+	int i;
+
+	for (i=0 ; i < MCL_MAXTYPES; i++) {
+		for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+			if (!export_matches(exp, dom, path, ai))
+				continue;
+			if (!found) {
+				found = exp;
+				found_type = i;
+				continue;
+			}
+			/* Always prefer non-V4ROOT exports */
+			if (exp->m_export.e_flags & NFSEXP_V4ROOT)
+				continue;
+			if (found->m_export.e_flags & NFSEXP_V4ROOT) {
+				found = exp;
+				found_type = i;
+				continue;
+			}
+
+			/* If one is a CROSSMOUNT, then prefer the longest path */
+			if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
+			     (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) &&
+			    strlen(found->m_export.e_path) !=
+			    strlen(exp->m_export.e_path)) {
+
+				if (strlen(exp->m_export.e_path) >
+				    strlen(found->m_export.e_path)) {
+					found = exp;
+					found_type = i;
+				}
+				continue;
+
+			} else if (found_type == i && found->m_warned == 0) {
+				xlog(L_WARNING, "%s exported to both %s and %s, "
+				     "arbitrarily choosing options from first",
+				     path, found->m_client->m_hostname, exp->m_client->m_hostname);
+				found->m_warned = 1;
+			}
+		}
+	}
+	return found;
+}
+
+#ifdef HAVE_JUNCTION_SUPPORT
+
+#include <libxml/parser.h>
+#include "junction.h"
+
+struct nfs_fsloc_set {
+	int			 ns_ttl;
+	struct nfs_fsloc	*ns_current;
+	struct nfs_fsloc	*ns_list;
+};
+
+/*
+ * Find the export entry for the parent of "pathname".
+ * Caller must not free returned exportent.
+ */
+static struct exportent *lookup_parent_export(char *dom,
+		const char *pathname, struct addrinfo *ai)
+{
+	char *parent, *slash;
+	nfs_export *result;
+
+	parent = strdup(pathname);
+	if (parent == NULL) {
+		xlog(D_GENERAL, "%s: failed to allocate parent path buffer",
+			__func__);
+		goto out_default;
+	}
+	xlog(D_CALL, "%s: pathname = '%s'", __func__, pathname);
+
+again:
+	/* shorten pathname by one component */
+	slash = strrchr(parent, '/');
+	if (slash == NULL) {
+		xlog(D_GENERAL, "%s: no slash found in pathname",
+			__func__);
+		goto out_default;
+	}
+	*slash = '\0';
+
+	if (strlen(parent) == 0) {
+		result = lookup_export(dom, "/", ai);
+		if (result == NULL) {
+			xlog(L_ERROR, "%s: no root export found.", __func__);
+			goto out_default;
+		}
+		goto out;
+	}
+
+	result = lookup_export(dom, parent, ai);
+	if (result == NULL) {
+		xlog(D_GENERAL, "%s: lookup_export(%s) found nothing",
+			__func__, parent);
+		goto again;
+	}
+
+out:
+	xlog(D_CALL, "%s: found export for %s", __func__, parent);
+	free(parent);
+	return &result->m_export;
+
+out_default:
+	free(parent);
+	return mkexportent("*", "/", "insecure");
+}
+
+static int get_next_location(struct nfs_fsloc_set *locset,
+		char **hostname, char **export_path, int *ttl)
+{
+	char *hostname_tmp, *export_path_tmp;
+	struct nfs_fsloc *fsloc;
+
+	if (locset->ns_current == NULL)
+		return ENOENT;
+	fsloc = locset->ns_current;
+
+	hostname_tmp = strdup(fsloc->nfl_hostname);
+	if (hostname_tmp == NULL)
+		return ENOMEM;
+
+	if (nsdb_path_array_to_posix(fsloc->nfl_rootpath,
+					&export_path_tmp)) {
+		free(hostname_tmp);
+		return EINVAL;
+	}
+
+	*hostname = hostname_tmp;
+	*export_path = export_path_tmp;
+	*ttl = locset->ns_ttl;
+	locset->ns_current = locset->ns_current->nfl_next;
+	return 0;
+}
+
+/*
+ * Walk through a set of FS locations and build an e_fslocdata string.
+ * Returns true if all went to plan; otherwise, false.
+ */
+static bool locations_to_fslocdata(struct nfs_fsloc_set *locations,
+		char *fslocdata, size_t remaining, int *ttl)
+{
+	char *server, *last_path, *rootpath, *ptr;
+	_Bool seen = false;
+
+	last_path = NULL;
+	rootpath = NULL;
+	server = NULL;
+	ptr = fslocdata;
+	*ttl = 0;
+
+	for (;;) {
+		int len, status;
+
+		status = get_next_location(locations, &server,
+							&rootpath, ttl);
+		if (status == ENOENT)
+			break;
+		if (status) {
+			xlog(D_GENERAL, "%s: failed to parse location: %s",
+				__func__, strerror(status));
+			goto out_false;
+		}
+		xlog(D_GENERAL, "%s: Location: %s:%s",
+			__func__, server, rootpath);
+
+		if (last_path && strcmp(rootpath, last_path) == 0) {
+			len = snprintf(ptr, remaining, "+%s", server);
+			if (len < 0) {
+				xlog(D_GENERAL, "%s: snprintf: %m", __func__);
+				goto out_false;
+			}
+			if ((size_t)len >= remaining) {
+				xlog(D_GENERAL, "%s: fslocdata buffer overflow", __func__);
+				goto out_false;
+			}
+			remaining -= (size_t)len;
+			ptr += len;
+		} else {
+			if (last_path == NULL)
+				len = snprintf(ptr, remaining, "%s@%s",
+							rootpath, server);
+			else
+				len = snprintf(ptr, remaining, ":%s@%s",
+							rootpath, server);
+			if (len < 0) {
+				xlog(D_GENERAL, "%s: snprintf: %m", __func__);
+				goto out_false;
+			}
+			if ((size_t)len >= remaining) {
+				xlog(D_GENERAL, "%s: fslocdata buffer overflow",
+					__func__);
+				goto out_false;
+			}
+			remaining -= (size_t)len;
+			ptr += len;
+			last_path = rootpath;
+		}
+
+		seen = true;
+		free(rootpath);
+		free(server);
+	}
+
+	xlog(D_CALL, "%s: fslocdata='%s', ttl=%d",
+		__func__, fslocdata, *ttl);
+	return seen;
+
+out_false:
+	free(rootpath);
+	free(server);
+	return false;
+}
+
+/*
+ * Duplicate the junction's parent's export options and graft in
+ * the fslocdata we constructed from the locations list.
+ */
+static struct exportent *create_junction_exportent(struct exportent *parent,
+		const char *junction, const char *fslocdata, int ttl)
+{
+	static struct exportent *eep;
+
+	eep = (struct exportent *)malloc(sizeof(*eep));
+	if (eep == NULL)
+		goto out_nomem;
+
+	dupexportent(eep, parent);
+	strcpy(eep->e_path, junction);
+	eep->e_hostname = strdup(parent->e_hostname);
+	if (eep->e_hostname == NULL) {
+		free(eep);
+		goto out_nomem;
+	}
+	free(eep->e_uuid);
+	eep->e_uuid = NULL;
+	eep->e_ttl = (unsigned int)ttl;
+
+	free(eep->e_fslocdata);
+	eep->e_fslocdata = strdup(fslocdata);
+	if (eep->e_fslocdata == NULL) {
+		free(eep->e_hostname);
+		free(eep);
+		goto out_nomem;
+	}
+	eep->e_fslocmethod = FSLOC_REFER;
+	return eep;
+
+out_nomem:
+	xlog(L_ERROR, "%s: No memory", __func__);
+	return NULL;
+}
+
+/*
+ * Walk through the set of FS locations and build an exportent.
+ * Returns pointer to an exportent if "junction" refers to a junction.
+ */
+static struct exportent *locations_to_export(struct nfs_fsloc_set *locations,
+		const char *junction, struct exportent *parent)
+{
+	static char fslocdata[BUFSIZ];
+	int ttl;
+
+	fslocdata[0] = '\0';
+	if (!locations_to_fslocdata(locations, fslocdata, sizeof(fslocdata), &ttl))
+		return NULL;
+	return create_junction_exportent(parent, junction, fslocdata, ttl);
+}
+
+static int
+nfs_get_basic_junction(const char *junct_path, struct nfs_fsloc_set **locset)
+{
+	struct nfs_fsloc_set *new;
+	FedFsStatus retval;
+
+	new = calloc(1, sizeof(struct nfs_fsloc_set));
+	if (new == NULL)
+		return ENOMEM;
+
+	retval = nfs_get_locations(junct_path, &new->ns_list);
+	if (retval) {
+		nfs_free_locations(new->ns_list);
+		free(new);
+		return EINVAL;
+	}
+
+	new->ns_current = new->ns_list;
+	new->ns_ttl = 300;
+	*locset = new;
+	return 0;
+}
+
+static struct exportent *lookup_junction(char *dom, const char *pathname,
+		struct addrinfo *ai)
+{
+	struct exportent *parent, *exp = NULL;
+	struct nfs_fsloc_set *locations;
+	int status;
+
+	xmlInitParser();
+
+	if (nfs_is_junction(pathname)) {
+		xlog(D_GENERAL, "%s: %s is not a junction",
+			__func__, pathname);
+		goto out;
+	}
+	status = nfs_get_basic_junction(pathname, &locations);
+	if (status) {
+		xlog(L_WARNING, "Dangling junction %s: %s",
+			pathname, strerror(status));
+		goto out;
+	}
+
+	parent = lookup_parent_export(dom, pathname, ai);
+	if (parent == NULL)
+		goto free_locations;
+
+	exp = locations_to_export(locations, pathname, parent);
+
+free_locations:
+	nfs_free_locations(locations->ns_list);
+	free(locations);
+
+out:
+	xmlCleanupParser();
+	return exp;
+}
+
+static void lookup_nonexport(int f, char *buf, int buflen, char *dom, char *path,
+		struct addrinfo *ai)
+{
+	struct exportent *eep;
+
+	eep = lookup_junction(dom, path, ai);
+	dump_to_cache(f, buf, buflen, dom, path, eep, 0);
+	if (eep == NULL)
+		return;
+	exportent_release(eep);
+	free(eep);
+}
+
+#else	/* !HAVE_JUNCTION_SUPPORT */
+
+static void lookup_nonexport(int f, char *buf, int buflen, char *dom, char *path,
+		struct addrinfo *UNUSED(ai))
+{
+	dump_to_cache(f, buf, buflen, dom, path, NULL, 0);
+}
+
+#endif	/* !HAVE_JUNCTION_SUPPORT */
+
+static void nfsd_export(int f)
+{
+	/* requests are:
+	 *  domain path
+	 * determine export options and return:
+	 *  domain path expiry flags anonuid anongid fsid
+	 */
+
+	char *dom, *path;
+	nfs_export *found = NULL;
+	struct addrinfo *ai = NULL;
+	char buf[RPC_CHAN_BUF_SIZE], *bp;
+	int blen;
+
+	blen = cache_read(f, buf, sizeof(buf));
+	if (blen <= 0 || buf[blen-1] != '\n') return;
+	buf[blen-1] = 0;
+
+	xlog(D_CALL, "nfsd_export: inbuf '%s'", buf);
+
+	bp = buf;
+	dom = malloc(blen);
+	path = malloc(blen);
+
+	if (!dom || !path)
+		goto out;
+
+	if (qword_get(&bp, dom, blen) <= 0)
+		goto out;
+	if (qword_get(&bp, path, blen) <= 0)
+		goto out;
+
+	auth_reload();
+
+	if (is_ipaddr_client(dom)) {
+		ai = lookup_client_addr(dom);
+		if (!ai)
+			goto out;
+	}
+
+	found = lookup_export(dom, path, ai);
+
+	if (found) {
+		char *mp = found->m_export.e_mountpoint;
+
+		if (mp && !*mp)
+			mp = found->m_export.e_path;
+		errno = 0;
+		if (mp && !is_mountpoint(mp)) {
+			if (errno != 0 && !path_lookup_error(errno))
+				goto out;
+			/* Exportpoint is not mounted, so tell kernel it is
+			 * not available.
+			 * This will cause it not to appear in the V4 Pseudo-root
+			 * and so a "mount" of this path will fail, just like with
+			 * V3.
+			 * Any filehandle for this mountpoint from an earlier
+			 * mount will block in nfsd.fh lookup.
+			 */
+			xlog(L_WARNING,
+			     "Cannot export path '%s': not a mountpoint",
+			     path);
+			dump_to_cache(f, buf, sizeof(buf), dom, path,
+				      NULL, 60);
+		} else if (dump_to_cache(f, buf, sizeof(buf), dom, path,
+					 &found->m_export, 0) < 0) {
+			xlog(L_WARNING,
+			     "Cannot export %s, possibly unsupported filesystem"
+			     " or fsid= required", path);
+			dump_to_cache(f, buf, sizeof(buf), dom, path, NULL, 0);
+		}
+	} else
+		lookup_nonexport(f, buf, sizeof(buf), dom, path, ai);
+
+ out:
+	xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
+	if (dom) free(dom);
+	if (path) free(path);
+	nfs_freeaddrinfo(ai);
+}
+
+
+struct {
+	char *cache_name;
+	void (*cache_handle)(int f);
+	int f;
+} cachelist[] = {
+	{ "auth.unix.ip", auth_unix_ip, -1 },
+	{ "auth.unix.gid", auth_unix_gid, -1 },
+	{ "nfsd.export", nfsd_export, -1 },
+	{ "nfsd.fh", nfsd_fh, -1 },
+	{ NULL, NULL, -1 }
+};
+
+extern int manage_gids;
+
+/**
+ * cache_open - prepare communications channels with kernel RPC caches
+ *
+ */
+void cache_open(void) 
+{
+	int i;
+
+	for (i=0; cachelist[i].cache_name; i++ ) {
+		char path[100];
+		if (!manage_gids && cachelist[i].cache_handle == auth_unix_gid)
+			continue;
+		sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
+		cachelist[i].f = open(path, O_RDWR);
+	}
+}
+
+/**
+ * cache_set_fds - prepare cache file descriptors for one iteration of the service loop
+ * @fdset: pointer to fd_set to prepare
+ */
+void cache_set_fds(fd_set *fdset)
+{
+	int i;
+	for (i=0; cachelist[i].cache_name; i++) {
+		if (cachelist[i].f >= 0)
+			FD_SET(cachelist[i].f, fdset);
+	}
+}
+
+/**
+ * cache_process_req - process any active cache file descriptors during service loop iteration
+ * @fdset: pointer to fd_set to examine for activity
+ */
+int cache_process_req(fd_set *readfds) 
+{
+	int i;
+	int cnt = 0;
+	for (i=0; cachelist[i].cache_name; i++) {
+		if (cachelist[i].f >= 0 &&
+		    FD_ISSET(cachelist[i].f, readfds)) {
+			cnt++;
+			cachelist[i].cache_handle(cachelist[i].f);
+			FD_CLR(cachelist[i].f, readfds);
+		}
+	}
+	return cnt;
+}
+
+/**
+ * cache_process - process incoming upcalls
+ * Returns -ve on error, or number of fds in svc_fds
+ * that might need processing.
+ */
+int cache_process(fd_set *readfds)
+{
+	fd_set fdset;
+	int	selret;
+	struct timeval tv = { 24*3600, 0 };
+
+	if (!readfds) {
+		FD_ZERO(&fdset);
+		readfds = &fdset;
+	}
+	cache_set_fds(readfds);
+	v4clients_set_fds(readfds);
+
+	if (delayed) {
+		time_t now = time(NULL);
+		time_t delay;
+		if (delayed->last_attempt > now)
+			/* Clock updated - retry immediately */
+			delayed->last_attempt = now - RETRY_SEC;
+		delay = delayed->last_attempt + RETRY_SEC - now;
+		if (delay < 0)
+			delay = 0;
+		tv.tv_sec = delay;
+	}
+	selret = select(FD_SETSIZE, readfds, NULL, NULL, &tv);
+
+	if (delayed) {
+		time_t now = time(NULL);
+		struct delayed *d = delayed;
+
+		if (d->last_attempt + RETRY_SEC <= now) {
+			delayed = d->next;
+			d->next = NULL;
+			nfsd_retry_fh(d);
+		}
+	}
+
+	switch (selret) {
+	case -1:
+		if (errno == EINTR || errno == ECONNREFUSED
+		    || errno == ENETUNREACH || errno == EHOSTUNREACH)
+			return 0;
+		return -1;
+
+	default:
+		selret -= cache_process_req(readfds);
+		selret -= v4clients_process(readfds);
+		if (selret < 0)
+			selret = 0;
+	}
+	return selret;
+}
+
+/*
+ * Give IP->domain and domain+path->options to kernel
+ * % echo nfsd $IP  $[now+DEFAULT_TTL] $domain > /proc/net/rpc/auth.unix.ip/channel
+ * % echo $domain $path $[now+DEFAULT_TTL] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
+ */
+
+static int cache_export_ent(char *buf, int buflen, char *domain, struct exportent *exp, char *path)
+{
+	int f, err;
+
+	f = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
+	if (f < 0) return -1;
+
+	err = dump_to_cache(f, buf, buflen, domain, exp->e_path, exp, 0);
+	if (err) {
+		xlog(L_WARNING,
+		     "Cannot export %s, possibly unsupported filesystem or"
+		     " fsid= required", exp->e_path);
+	}
+
+	while (err == 0 && (exp->e_flags & NFSEXP_CROSSMOUNT) && path) {
+		/* really an 'if', but we can break out of
+		 * a 'while' more easily */
+		/* Look along 'path' for other filesystems
+		 * and export them with the same options
+		 */
+		struct stat stb;
+		size_t l = strlen(exp->e_path);
+		dev_t dev;
+
+		if (strlen(path) <= l || path[l] != '/' ||
+		    strncmp(exp->e_path, path, l) != 0)
+			break;
+		if (nfsd_path_stat(exp->e_path, &stb) != 0)
+			break;
+		dev = stb.st_dev;
+		while(path[l] == '/') {
+			char c;
+			/* errors for submount should fail whole filesystem */
+			int err2;
+
+			l++;
+			while (path[l] != '/' && path[l])
+				l++;
+			c = path[l];
+			path[l] = 0;
+			err2 = nfsd_path_lstat(path, &stb);
+			path[l] = c;
+			if (err2 < 0)
+				break;
+			if (stb.st_dev == dev)
+				continue;
+			dev = stb.st_dev;
+			path[l] = 0;
+			dump_to_cache(f, buf, buflen, domain, path, exp, 0);
+			path[l] = c;
+		}
+		break;
+	}
+
+	close(f);
+	return err;
+}
+
+/**
+ * cache_export - Inform kernel of a new nfs_export
+ * @exp: target nfs_export
+ * @path: NUL-terminated C string containing export path
+ */
+int cache_export(nfs_export *exp, char *path)
+{
+	char ip[INET6_ADDRSTRLEN];
+	char buf[RPC_CHAN_BUF_SIZE], *bp;
+	int blen, f;
+
+	f = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
+	if (f < 0)
+		return -1;
+
+	bp = buf, blen = sizeof(buf);
+	qword_add(&bp, &blen, "nfsd");
+	qword_add(&bp, &blen, host_ntop(get_addrlist(exp->m_client, 0), ip, sizeof(ip)));
+	qword_adduint(&bp, &blen, time(0) + exp->m_export.e_ttl);
+	qword_add(&bp, &blen, exp->m_client->m_hostname);
+	qword_addeol(&bp, &blen);
+	if (blen <= 0 || cache_write(f, buf, bp - buf) != bp - buf) blen = -1;
+	close(f);
+	if (blen < 0) return -1;
+
+	return cache_export_ent(buf, sizeof(buf), exp->m_client->m_hostname, &exp->m_export, path);
+}
+
+/**
+ * cache_get_filehandle - given an nfs_export, get its root filehandle
+ * @exp: target nfs_export
+ * @len: length of requested file handle
+ * @p: NUL-terminated C string containing export path
+ *
+ * Returns pointer to NFS file handle of root directory of export
+ *
+ * { 
+ *   echo $domain $path $length 
+ *   read filehandle <&0
+ * } <> /proc/fs/nfsd/filehandle
+ */
+struct nfs_fh_len *
+cache_get_filehandle(nfs_export *exp, int len, char *p)
+{
+	static struct nfs_fh_len fh;
+	char buf[RPC_CHAN_BUF_SIZE], *bp;
+	int blen, f;
+
+	f = open("/proc/fs/nfsd/filehandle", O_RDWR);
+	if (f < 0) {
+		f = open("/proc/fs/nfs/filehandle", O_RDWR);
+		if (f < 0) return NULL;
+	}
+
+	bp = buf, blen = sizeof(buf);
+	qword_add(&bp, &blen, exp->m_client->m_hostname);
+	qword_add(&bp, &blen, p);
+	qword_addint(&bp, &blen, len);
+	qword_addeol(&bp, &blen);
+	if (blen <= 0 || cache_write(f, buf, bp - buf) != bp - buf) {
+		close(f);
+		return NULL;
+	}
+	bp = buf;
+	blen = cache_read(f, buf, sizeof(buf));
+	close(f);
+
+	if (blen <= 0 || buf[blen-1] != '\n')
+		return NULL;
+	buf[blen-1] = 0;
+
+	memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
+	fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE);
+	return &fh;
+}
+
+/* Wait for all worker child processes to exit and reap them */
+void
+cache_wait_for_workers(char *prog)
+{
+	int status;
+	pid_t pid;
+
+	for (;;) {
+
+		pid = waitpid(0, &status, 0);
+
+		if (pid < 0) {
+			if (errno == ECHILD)
+				return; /* no more children */
+			xlog(L_FATAL, "%s: can't wait: %s\n", prog,
+					strerror(errno));
+		}
+
+		/* Note: because we SIG_IGN'd SIGCHLD earlier, this
+		 * does not happen on 2.6 kernels, and waitpid() blocks
+		 * until all the children are dead then returns with
+		 * -ECHILD.  But, we don't need to do anything on the
+		 * death of individual workers, so we don't care. */
+		xlog(L_NOTICE, "%s: reaped child %d, status %d\n",
+		     prog, (int)pid, status);
+	}
+}
+
+/* Fork num_threads worker children and wait for them */
+int
+cache_fork_workers(char *prog, int num_threads)
+{
+	int i;
+	pid_t pid;
+
+	if (num_threads <= 1)
+		return 1;
+
+	xlog(L_NOTICE, "%s: starting %d threads\n", prog, num_threads);
+
+	for (i = 0 ; i < num_threads ; i++) {
+		pid = fork();
+		if (pid < 0) {
+			xlog(L_FATAL, "%s: cannot fork: %s\n", prog,
+					strerror(errno));
+		}
+		if (pid == 0) {
+			/* worker child */
+
+			/* Re-enable the default action on SIGTERM et al
+			 * so that workers die naturally when sent them.
+			 * Only the parent unregisters with pmap and
+			 * hence needs to do special SIGTERM handling. */
+			struct sigaction sa;
+			sa.sa_handler = SIG_DFL;
+			sa.sa_flags = 0;
+			sigemptyset(&sa.sa_mask);
+			sigaction(SIGHUP, &sa, NULL);
+			sigaction(SIGINT, &sa, NULL);
+			sigaction(SIGTERM, &sa, NULL);
+
+			/* fall into my_svc_run in caller */
+			return 1;
+		}
+	}
+
+	/* in parent */
+	cache_wait_for_workers(prog);
+	return 0;
+}
diff --git a/support/export/client.c b/support/export/client.c
new file mode 100644
index 0000000..79164fe
--- /dev/null
+++ b/support/export/client.c
@@ -0,0 +1,800 @@
+/*
+ * support/export/client.c
+ *
+ * Maintain list of nfsd clients.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <netdb.h>
+#include <errno.h>
+
+#include "sockaddr.h"
+#include "misc.h"
+#include "nfslib.h"
+#include "exportfs.h"
+
+/* netgroup stuff never seems to be defined in any header file. Linux is
+ * not alone in this.
+ */
+#if !defined(__GLIBC__) || __GLIBC__ < 2
+extern int	innetgr(char *netgr, char *host, char *, char *);
+#endif
+
+static char	*add_name(char *old, const char *add);
+
+nfs_client	*clientlist[MCL_MAXTYPES] = { NULL, };
+
+
+static void
+init_addrlist(nfs_client *clp, const struct addrinfo *ai)
+{
+	int i;
+
+	if (ai == NULL)
+		return;
+
+	for (i = 0; (ai != NULL) && (i < NFSCLNT_ADDRMAX); i++) {
+		set_addrlist(clp, i, ai->ai_addr);
+		ai = ai->ai_next;
+	}
+
+	clp->m_naddr = i;
+}
+
+static void
+client_free(nfs_client *clp)
+{
+	free(clp->m_hostname);
+	free(clp);
+}
+
+static int
+init_netmask4(nfs_client *clp, const char *slash)
+{
+	struct sockaddr_in sin = {
+		.sin_family		= AF_INET,
+	};
+	uint32_t shift;
+
+	/*
+	 * Decide what kind of netmask was specified.  If there's
+	 * no '/' present, assume the netmask is all ones.  If
+	 * there is a '/' and at least one '.', look for a spelled-
+	 * out netmask.  Otherwise, assume it was a prefixlen.
+	 */
+	if (slash == NULL)
+		shift = 0;
+	else {
+		unsigned long prefixlen;
+
+		if (strchr(slash + 1, '.') != NULL) {
+			if (inet_pton(AF_INET, slash + 1,
+						&sin.sin_addr.s_addr) == 0)
+				goto out_badmask;
+			set_addrlist_in(clp, 1, &sin);
+			return 1;
+		} else {
+			char *endptr;
+
+			prefixlen = strtoul(slash + 1, &endptr, 10);
+			if (*endptr != '\0' && prefixlen != ULONG_MAX &&
+			    errno != ERANGE)
+				goto out_badprefix;
+		}
+		if (prefixlen > 32)
+			goto out_badprefix;
+		shift = 32 - (uint32_t)prefixlen;
+	}
+
+	/*
+	 * Now construct the full netmask bitmask in a sockaddr_in,
+	 * and plant it in the nfs_client record.
+	 */
+	sin.sin_addr.s_addr = htonl((uint32_t)~0 << shift);
+	set_addrlist_in(clp, 1, &sin);
+
+	return 1;
+
+out_badmask:
+	xlog(L_ERROR, "Invalid netmask `%s' for %s", slash + 1, clp->m_hostname);
+	return 0;
+
+out_badprefix:
+	xlog(L_ERROR, "Invalid prefix `%s' for %s", slash + 1, clp->m_hostname);
+	return 0;
+}
+
+#ifdef IPV6_SUPPORTED
+static int
+init_netmask6(nfs_client *clp, const char *slash)
+{
+	struct sockaddr_in6 sin6 = {
+		.sin6_family		= AF_INET6,
+	};
+	unsigned long prefixlen;
+	uint32_t shift;
+	int i;
+
+	/*
+	 * Decide what kind of netmask was specified.  If there's
+	 * no '/' present, assume the netmask is all ones.  If
+	 * there is a '/' and at least one ':', look for a spelled-
+	 * out netmask.  Otherwise, assume it was a prefixlen.
+	 */
+	if (slash == NULL)
+		prefixlen = 128;
+	else {
+		if (strchr(slash + 1, ':') != NULL) {
+			if (!inet_pton(AF_INET6, slash + 1, &sin6.sin6_addr))
+				goto out_badmask;
+			set_addrlist_in6(clp, 1, &sin6);
+			return 1;
+		} else {
+			char *endptr;
+
+			prefixlen = strtoul(slash + 1, &endptr, 10);
+			if (*endptr != '\0' && prefixlen != ULONG_MAX &&
+			    errno != ERANGE)
+				goto out_badprefix;
+		}
+		if (prefixlen > 128)
+			goto out_badprefix;
+	}
+
+	/*
+	 * Now construct the full netmask bitmask in a sockaddr_in6,
+	 * and plant it in the nfs_client record.
+	 */
+	for (i = 0; prefixlen > 32; i++) {
+		sin6.sin6_addr.s6_addr32[i] = 0xffffffff;
+		prefixlen -= 32;
+	}
+	shift = 32 - (uint32_t)prefixlen;
+	sin6.sin6_addr.s6_addr32[i] = htonl((uint32_t)~0 << shift);
+	set_addrlist_in6(clp, 1, &sin6);
+
+	return 1;
+
+out_badmask:
+	xlog(L_ERROR, "Invalid netmask `%s' for %s", slash + 1, clp->m_hostname);
+	return 0;
+
+out_badprefix:
+	xlog(L_ERROR, "Invalid prefix `%s' for %s", slash + 1, clp->m_hostname);
+	return 0;
+}
+#else	/* IPV6_SUPPORTED */
+static int
+init_netmask6(nfs_client *UNUSED(clp), const char *UNUSED(slash))
+{
+	return 0;
+}
+#endif	/* IPV6_SUPPORTED */
+
+/*
+ * Parse the network mask for M_SUBNETWORK type clients.
+ *
+ * Return TRUE if successful, or FALSE if some error occurred.
+ */
+static int
+init_subnetwork(nfs_client *clp)
+{
+	struct addrinfo *ai;
+	sa_family_t family;
+	int result = 0;
+	char *slash;
+
+	slash = strchr(clp->m_hostname, '/');
+	if (slash != NULL) {
+		*slash = '\0';
+		ai = host_pton(clp->m_hostname);
+		*slash = '/';
+	} else
+		ai = host_pton(clp->m_hostname);
+	if (ai == NULL) {
+		xlog(L_ERROR, "Invalid IP address %s", clp->m_hostname);
+		return result;
+	}
+
+	set_addrlist(clp, 0, ai->ai_addr);
+	family = ai->ai_addr->sa_family;
+
+	nfs_freeaddrinfo(ai);
+
+	switch (family) {
+	case AF_INET:
+		result = init_netmask4(clp, slash);
+		break;
+	case AF_INET6:
+		result = init_netmask6(clp, slash);
+		break;
+	default:
+		xlog(L_ERROR, "Unsupported address family for %s",
+			clp->m_hostname);
+	}
+
+	return result;
+}
+
+static int
+client_init(nfs_client *clp, const char *hname, const struct addrinfo *ai)
+{
+	clp->m_hostname = strdup(hname);
+	if (clp->m_hostname == NULL)
+		return 0;
+
+	clp->m_exported = 0;
+	clp->m_count = 0;
+	clp->m_naddr = 0;
+
+	if (clp->m_type == MCL_SUBNETWORK)
+		return init_subnetwork(clp);
+
+	init_addrlist(clp, ai);
+	return 1;
+}
+
+static void
+client_add(nfs_client *clp)
+{
+	nfs_client **cpp;
+
+	cpp = &clientlist[clp->m_type];
+	while (*cpp != NULL)
+		cpp = &((*cpp)->m_next);
+	clp->m_next = NULL;
+	*cpp = clp;
+}
+
+/**
+ * client_lookup - look for @hname in our list of cached nfs_clients
+ * @hname: '\0'-terminated ASCII string containing hostname to look for
+ * @canonical: if set, @hname is known to be canonical DNS name
+ *
+ * Returns pointer to a matching or freshly created nfs_client.  NULL
+ * is returned if some problem occurs.
+ */
+nfs_client *
+client_lookup(char *hname, int canonical)
+{
+	nfs_client	*clp = NULL;
+	int		htype;
+	struct addrinfo	*ai = NULL;
+
+	htype = client_gettype(hname);
+
+	if (htype == MCL_FQDN && !canonical) {
+		ai = host_addrinfo(hname);
+		if (!ai) {
+			xlog(L_WARNING, "Failed to resolve %s", hname);
+			goto out;
+		}
+		hname = ai->ai_canonname;
+
+		for (clp = clientlist[htype]; clp; clp = clp->m_next)
+			if (client_check(clp, ai))
+				break;
+	} else {
+		for (clp = clientlist[htype]; clp; clp = clp->m_next) {
+			if (strcasecmp(hname, clp->m_hostname)==0)
+				break;
+		}
+	}
+
+	if (clp == NULL) {
+		clp = calloc(1, sizeof(*clp));
+		if (clp == NULL)
+			goto out;
+		clp->m_type = htype;
+		if (!client_init(clp, hname, NULL)) {
+			client_free(clp);
+			clp = NULL;
+			goto out;
+		}
+		client_add(clp);
+	}
+
+	if (htype == MCL_FQDN && clp->m_naddr == 0)
+		init_addrlist(clp, ai);
+
+out:
+	nfs_freeaddrinfo(ai);
+	return clp;
+}
+
+/**
+ * client_dup - create a copy of an nfs_client
+ * @clp: pointer to nfs_client to copy
+ * @ai: pointer to addrinfo used to initialize the new client's addrlist
+ *
+ * Returns a dynamically allocated nfs_client if successful, or
+ * NULL if some problem occurs.  Caller must free the returned
+ * nfs_client with free(3).
+ */
+nfs_client *
+client_dup(const nfs_client *clp, const struct addrinfo *ai)
+{
+	nfs_client		*new;
+
+	new = (nfs_client *)malloc(sizeof(*new));
+	if (new == NULL)
+		return NULL;
+	memcpy(new, clp, sizeof(*new));
+	new->m_type = MCL_FQDN;
+	new->m_hostname = NULL;
+
+	if (!client_init(new, ai->ai_canonname, ai)) {
+		client_free(new);
+		return NULL;
+	}
+	client_add(new);
+	return new;
+}
+
+/**
+ * client_release - drop a reference to an nfs_client record
+ *
+ */
+void
+client_release(nfs_client *clp)
+{
+	if (clp->m_count <= 0)
+		xlog(L_FATAL, "client_free: m_count <= 0!");
+	clp->m_count--;
+}
+
+/**
+ * client_freeall - deallocate all nfs_client records
+ *
+ */
+void
+client_freeall(void)
+{
+	nfs_client	*clp, **head;
+	int		i;
+
+	for (i = 0; i < MCL_MAXTYPES; i++) {
+		head = clientlist + i;
+		while (*head) {
+			*head = (clp = *head)->m_next;
+			client_free(clp);
+		}
+	}
+}
+
+/**
+ * client_resolve - look up an IP address
+ * @sap: pointer to socket address to resolve
+ *
+ * Returns an addrinfo structure, or NULL if some problem occurred.
+ * Caller must free the result with freeaddrinfo(3).
+ */
+struct addrinfo *
+client_resolve(const struct sockaddr *sap)
+{
+	struct addrinfo *ai = NULL;
+
+	if (clientlist[MCL_WILDCARD] || clientlist[MCL_NETGROUP])
+		ai = host_reliable_addrinfo(sap);
+	if (ai == NULL)
+		ai = host_numeric_addrinfo(sap);
+
+	return ai;
+}
+
+/**
+ * client_compose - Make a list of cached hostnames that match an IP address
+ * @ai: pointer to addrinfo containing IP address information to match
+ *
+ * Gather all known client hostnames that match the IP address, and sort
+ * the result into a comma-separated list.
+ *
+ * Returns a '\0'-terminated ASCII string containing a comma-separated
+ * sorted list of client hostnames, or NULL if no client records matched
+ * the IP address or memory could not be allocated.  Caller must free the
+ * returned string with free(3).
+ */
+char *
+client_compose(const struct addrinfo *ai)
+{
+	char *name = NULL;
+	int i;
+
+	for (i = 0 ; i < MCL_MAXTYPES; i++) {
+		nfs_client	*clp;
+		for (clp = clientlist[i]; clp ; clp = clp->m_next) {
+			if (!client_check(clp, ai))
+				continue;
+			name = add_name(name, clp->m_hostname);
+		}
+	}
+	return name;
+}
+
+/**
+ * client_member - check if @name is contained in the list @client
+ * @client: '\0'-terminated ASCII string containing
+ *		comma-separated list of hostnames
+ * @name: '\0'-terminated ASCII string containing hostname to look for
+ *
+ * Returns 1 if @name was found in @client, otherwise zero is returned.
+ */
+int
+client_member(const char *client, const char *name)
+{
+	size_t l = strlen(name);
+
+	while (*client) {
+		if (strncmp(client, name, l) == 0 &&
+		    (client[l] == ',' || client[l] == '\0'))
+			return 1;
+		client = strchr(client, ',');
+		if (client == NULL)
+			return 0;
+		client++;
+	}
+	return 0;
+}
+
+static int
+name_cmp(const char *a, const char *b)
+{
+	/* compare strings a and b, but only upto ',' in a */
+	while (*a && *b && *a != ',' && *a == *b)
+		a++, b++;
+	if (!*b && (!*a || *a == ','))
+		return 0;
+	if (!*b) return 1;
+	if (!*a || *a == ',') return -1;
+	return *a - *b;
+}
+
+static char *
+add_name(char *old, const char *add)
+{
+	size_t len = strlen(add) + 2;
+	char *new;
+	char *cp;
+	if (old) len += strlen(old);
+	
+	new = malloc(len);
+	if (!new) {
+		free(old);
+		return NULL;
+	}
+	cp = old;
+	while (cp && *cp && name_cmp(cp, add) < 0) {
+		/* step cp forward over a name */
+		char *e = strchr(cp, ',');
+		if (e)
+			cp = e+1;
+		else
+			cp = cp + strlen(cp);
+	}
+	len = cp-old;
+	if (old && len > 0) {
+		strncpy(new, old, len);
+		new[cp-old] = 0;
+	} else {
+		new[0] = 0;
+	}
+	if (cp != old && !*cp)
+		strcat(new, ",");
+	strcat(new, add);
+	if (cp && *cp) {
+		strcat(new, ",");
+		strcat(new, cp);
+	}
+	free(old);
+	return new;
+}
+
+/*
+ * Check each address listed in @ai against each address
+ * stored in @clp.  Return 1 if a match is found, otherwise
+ * zero.
+ */
+static int
+check_fqdn(const nfs_client *clp, const struct addrinfo *ai)
+{
+	int i;
+
+	for (; ai; ai = ai->ai_next)
+		for (i = 0; i < clp->m_naddr; i++)
+			if (nfs_compare_sockaddr(ai->ai_addr,
+							get_addrlist(clp, i)))
+				return 1;
+
+	return 0;
+}
+
+static _Bool
+mask_match(const uint32_t a, const uint32_t b, const uint32_t m)
+{
+	return ((a ^ b) & m) == 0;
+}
+
+static int
+check_subnet_v4(const struct sockaddr_in *address,
+		const struct sockaddr_in *mask, const struct addrinfo *ai)
+{
+	for (; ai; ai = ai->ai_next) {
+		struct sockaddr_in *sin = (struct sockaddr_in *)ai->ai_addr;
+
+		if (sin->sin_family != AF_INET)
+			continue;
+
+		if (mask_match(address->sin_addr.s_addr,
+				sin->sin_addr.s_addr,
+				mask->sin_addr.s_addr))
+			return 1;
+	}
+	return 0;
+}
+
+#ifdef IPV6_SUPPORTED
+static int
+check_subnet_v6(const struct sockaddr_in6 *address,
+		const struct sockaddr_in6 *mask, const struct addrinfo *ai)
+{
+	for (; ai; ai = ai->ai_next) {
+		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai->ai_addr;
+
+		if (sin6->sin6_family != AF_INET6)
+			continue;
+
+		if (mask_match(address->sin6_addr.s6_addr32[0],
+				sin6->sin6_addr.s6_addr32[0],
+				mask->sin6_addr.s6_addr32[0]) &&
+		    mask_match(address->sin6_addr.s6_addr32[1],
+				sin6->sin6_addr.s6_addr32[1],
+				mask->sin6_addr.s6_addr32[1]) &&
+		    mask_match(address->sin6_addr.s6_addr32[2],
+				sin6->sin6_addr.s6_addr32[2],
+				mask->sin6_addr.s6_addr32[2]) &&
+		    mask_match(address->sin6_addr.s6_addr32[3],
+				sin6->sin6_addr.s6_addr32[3],
+				mask->sin6_addr.s6_addr32[3]))
+			return 1;
+	}
+	return 0;
+}
+#else	/* !IPV6_SUPPORTED */
+static int
+check_subnet_v6(const struct sockaddr_in6 *UNUSED(address),
+		const struct sockaddr_in6 *UNUSED(mask),
+		const struct addrinfo *UNUSED(ai))
+{
+	return 0;
+}
+#endif	/* !IPV6_SUPPORTED */
+
+/*
+ * Check each address listed in @ai against the subnetwork or
+ * host address stored in @clp.  Return 1 if an address in @hp
+ * matches the host address stored in @clp, otherwise zero.
+ */
+static int
+check_subnetwork(const nfs_client *clp, const struct addrinfo *ai)
+{
+	switch (get_addrlist(clp, 0)->sa_family) {
+	case AF_INET:
+		return check_subnet_v4(get_addrlist_in(clp, 0),
+				get_addrlist_in(clp, 1), ai);
+	case AF_INET6:
+		return check_subnet_v6(get_addrlist_in6(clp, 0),
+				get_addrlist_in6(clp, 1), ai);
+	}
+
+	return 0;
+}
+
+/*
+ * Check if a wildcard nfs_client record matches the canonical name
+ * or the aliases of a host.  Return 1 if a match is found, otherwise
+ * zero.
+ */
+static int
+check_wildcard(const nfs_client *clp, const struct addrinfo *ai)
+{
+	char *hname, *cname = clp->m_hostname;
+	struct hostent *hp;
+	char **ap;
+	int match;
+
+	match = 0;
+
+	hname = host_canonname(ai->ai_addr);
+	if (hname == NULL)
+		goto out;
+
+	if (wildmat(hname, cname)) {
+		match = 1;
+		goto out;
+	}
+
+	/* See if hname aliases listed in /etc/hosts or nis[+]
+	 * match the requested wildcard */
+	hp = gethostbyname(hname);
+	if (hp != NULL) {
+		for (ap = hp->h_aliases; *ap; ap++)
+			if (wildmat(*ap, cname)) {
+				match = 1;
+				goto out;
+			}
+	}
+
+out:
+	free(hname);
+	return match;
+}
+
+/*
+ * Check if @ai's hostname or aliases fall in a given netgroup.
+ * Return 1 if @ai represents a host in the netgroup, otherwise
+ * zero.
+ */
+#ifdef HAVE_INNETGR
+static int
+check_netgroup(const nfs_client *clp, const struct addrinfo *ai)
+{
+	const char *netgroup = clp->m_hostname + 1;
+	struct addrinfo *tmp = NULL;
+	struct hostent *hp;
+	char *dot, *hname, *ip;
+	int i, match;
+
+	match = 0;
+
+	hname = host_canonname(ai->ai_addr);
+	if (hname == NULL)
+		goto out;
+
+	/* First, try to match the hostname without
+	 * splitting off the domain */
+	if (innetgr(netgroup, hname, NULL, NULL)) {
+		match = 1;
+		goto out;
+	}
+
+	/* See if hname aliases listed in /etc/hosts or nis[+]
+	 * match the requested netgroup */
+	hp = gethostbyname(hname);
+	if (hp != NULL) {
+		for (i = 0; hp->h_aliases[i]; i++)
+			if (innetgr(netgroup, hp->h_aliases[i], NULL, NULL)) {
+				match = 1;
+				goto out;
+			}
+	}
+
+	/* If hname happens to be an IP address, convert it
+	 * to a the canonical DNS name bound to this address. */
+	tmp = host_pton(hname);
+	if (tmp != NULL) {
+		char *cname = host_canonname(tmp->ai_addr);
+		nfs_freeaddrinfo(tmp);
+
+		/* The resulting FQDN may be in our netgroup. */
+		if (cname != NULL) {
+			free(hname);
+			hname = cname;
+			if (innetgr(netgroup, hname, NULL, NULL)) {
+				match = 1;
+				goto out;
+			}
+		}
+	}
+
+	/* check whether the IP itself is in the netgroup */
+	ip = calloc(INET6_ADDRSTRLEN, 1);
+	if (ip == NULL)
+		goto out;
+
+	if (inet_ntop(ai->ai_family, &(((struct sockaddr_in *)ai->ai_addr)->sin_addr), ip, INET6_ADDRSTRLEN) == ip) {
+		if (innetgr(netgroup, ip, NULL, NULL)) {
+			free(hname);
+			hname = ip;
+			match = 1;
+			goto out;
+		}
+	}
+	free(ip);
+
+	/* Okay, strip off the domain (if we have one) */
+	dot = strchr(hname, '.');
+	if (dot == NULL)
+		goto out;
+
+	*dot = '\0';
+	match = innetgr(netgroup, hname, NULL, NULL);
+
+out:
+	free(hname);
+	return match;
+}
+#else	/* !HAVE_INNETGR */
+static int
+check_netgroup(__attribute__((unused)) const nfs_client *clp,
+		__attribute__((unused)) const struct addrinfo *ai)
+{
+	return 0;
+}
+#endif	/* !HAVE_INNETGR */
+
+/**
+ * client_check - check if IP address information matches a cached nfs_client
+ * @clp: pointer to a cached nfs_client record
+ * @ai: pointer to addrinfo to compare it with
+ *
+ * Returns 1 if the address information matches the cached nfs_client,
+ * otherwise zero.
+ */
+int
+client_check(const nfs_client *clp, const struct addrinfo *ai)
+{
+	switch (clp->m_type) {
+	case MCL_FQDN:
+		return check_fqdn(clp, ai);
+	case MCL_SUBNETWORK:
+		return check_subnetwork(clp, ai);
+	case MCL_WILDCARD:
+		return check_wildcard(clp, ai);
+	case MCL_NETGROUP:
+		return check_netgroup(clp, ai);
+	case MCL_ANONYMOUS:
+		return 1;
+	case MCL_GSS:
+		return 0;
+	default:
+		xlog(D_GENERAL, "%s: unrecognized client type: %d",
+				__func__, clp->m_type);
+	}
+
+	return 0;
+}
+
+/**
+ * client_gettype - determine type of nfs_client given an identifier
+ * @ident: '\0'-terminated ASCII string containing a client identifier
+ *
+ * Returns the type of nfs_client record that would be used for
+ * this client.
+ */
+int
+client_gettype(char *ident)
+{
+	char *sp;
+
+	if (ident[0] == '\0' || strcmp(ident, "*")==0)
+		return MCL_ANONYMOUS;
+	if (strncmp(ident, "gss/", 4) == 0)
+		return MCL_GSS;
+	if (ident[0] == '@') {
+#ifndef HAVE_INNETGR
+		xlog(L_WARNING, "netgroup support not compiled in");
+#endif
+		return MCL_NETGROUP;
+	}
+	for (sp = ident; *sp; sp++) {
+		if (*sp == '*' || *sp == '?' || *sp == '[')
+			return MCL_WILDCARD;
+		if (*sp == '/')
+			return MCL_SUBNETWORK;
+		if (*sp == '\\' && sp[1])
+			sp++;
+	}
+
+	return MCL_FQDN;
+}
diff --git a/support/export/export.c b/support/export/export.c
new file mode 100644
index 0000000..3e48c42
--- /dev/null
+++ b/support/export/export.c
@@ -0,0 +1,471 @@
+/*
+ * support/export/export.c
+ *
+ * Maintain list of exported file systems.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <errno.h>
+#include "xmalloc.h"
+#include "nfslib.h"
+#include "exportfs.h"
+#include "nfsd_path.h"
+#include "xlog.h"
+#include "reexport.h"
+
+exp_hash_table exportlist[MCL_MAXTYPES] = {{NULL, {{NULL,NULL}, }}, }; 
+static int export_hash(char *);
+
+static void	export_init(nfs_export *exp, nfs_client *clp,
+					struct exportent *nep);
+static void	export_add(nfs_export *exp);
+static int	export_check(const nfs_export *exp, const struct addrinfo *ai,
+				const char *path);
+
+/* Return a real path for the export. */
+static void
+exportent_mkrealpath(struct exportent *eep)
+{
+	const char *chroot = nfsd_path_nfsd_rootdir();
+	char *ret = NULL;
+
+	if (chroot) {
+		char buffer[PATH_MAX];
+		if (realpath(chroot, buffer))
+			ret = nfsd_path_prepend_dir(buffer, eep->e_path);
+		else
+			xlog(D_GENERAL, "%s: failed to resolve path %s: %m",
+					__func__, chroot);
+	}
+	if (!ret)
+		ret = xstrdup(eep->e_path);
+	eep->e_realpath = ret;
+}
+
+char *
+exportent_realpath(struct exportent *eep)
+{
+	if (!eep->e_realpath)
+		exportent_mkrealpath(eep);
+	return eep->e_realpath;
+}
+
+void
+exportent_release(struct exportent *eep)
+{
+	xfree(eep->e_squids);
+	xfree(eep->e_sqgids);
+	free(eep->e_mountpoint);
+	free(eep->e_fslocdata);
+	free(eep->e_uuid);
+	xfree(eep->e_hostname);
+	xfree(eep->e_realpath);
+}
+
+static void
+export_free(nfs_export *exp)
+{
+	exportent_release(&exp->m_export);
+	xfree(exp);
+}
+
+static void warn_duplicated_exports(nfs_export *exp, struct exportent *eep)
+{
+	if (exp->m_export.e_flags != eep->e_flags) {
+		xlog(L_ERROR, "incompatible duplicated export entries:");
+		xlog(L_ERROR, "\t%s:%s (0x%x) [IGNORED]", eep->e_hostname,
+				eep->e_path, eep->e_flags);
+		xlog(L_ERROR, "\t%s:%s (0x%x)", exp->m_export.e_hostname,
+				exp->m_export.e_path, exp->m_export.e_flags);
+	} else {
+		xlog(L_ERROR, "duplicated export entries:");
+		xlog(L_ERROR, "\t%s:%s", eep->e_hostname, eep->e_path);
+		xlog(L_ERROR, "\t%s:%s", exp->m_export.e_hostname,
+				exp->m_export.e_path);
+	}
+}
+
+/**
+ * export_read - read entries from /etc/exports
+ * @fname: name of file to read from
+ * @ignore_hosts: don't check validity of host names
+ *
+ * Returns number of read entries.
+ * @ignore_hosts can be set when the host names won't be used
+ * and when getting delays or errors due to problems with
+ * hostname looking is not acceptable.
+ */
+int
+export_read(char *fname, int ignore_hosts)
+{
+	struct exportent	*eep;
+	nfs_export		*exp;
+
+	int volumes = 0;
+	int reexport_found = 0;
+
+	setexportent(fname, "r");
+	while ((eep = getexportent(0,1)) != NULL) {
+		exp = export_lookup(eep->e_hostname, eep->e_path, ignore_hosts);
+		if (!exp) {
+			if (export_create(eep, 0))
+				/* possible complaints already logged */
+				volumes++;
+		}
+		else
+			warn_duplicated_exports(exp, eep);
+
+		if (eep->e_reexport)
+			reexport_found = 1;
+	}
+
+	if (reexport_found) {
+		for (int i = 0; i < MCL_MAXTYPES; i++) {
+			for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+				if (exp->m_export.e_reexport)
+					continue;
+
+				if (exp->m_export.e_flags & NFSEXP_FSID) {
+					xlog(L_ERROR, "When a reexport= option is present no manully assigned numerical fsid= options are allowed");
+					return -1;
+				}
+			}
+		}
+	}
+
+	endexportent();
+
+	return volumes;
+}
+
+/**
+ * export_d_read - read entries from /etc/exports.
+ * @fname: name of directory to read from
+ * @ignore_hosts: don't check validity of host names
+ *
+ * Returns number of read entries.
+ * Based on mnt_table_parse_dir() in
+ *  util-linux-ng/shlibs/mount/src/tab_parse.c
+ */
+int
+export_d_read(const char *dname, int ignore_hosts)
+{
+	int n = 0, i;
+	struct dirent **namelist = NULL;
+	int volumes = 0;
+
+
+	n = scandir(dname, &namelist, NULL, versionsort);
+	if (n < 0) {
+		if (errno == ENOENT)
+			/* Silently return */
+			return volumes;
+		xlog(L_NOTICE, "scandir %s: %s", dname, strerror(errno));
+	} else if (n == 0)
+		return volumes;
+
+	for (i = 0; i < n; i++) {
+		struct dirent *d = namelist[i];
+		size_t namesz;
+		char fname[PATH_MAX + 1];
+		int fname_len;
+
+
+		if (d->d_type != DT_UNKNOWN
+		    && d->d_type != DT_REG
+		    && d->d_type != DT_LNK)
+			continue;
+		if (*d->d_name == '.')
+			continue;
+
+#define _EXT_EXPORT_SIZ   (sizeof(_EXT_EXPORT) - 1)
+		namesz = strlen(d->d_name);
+		if (!namesz
+		    || namesz < _EXT_EXPORT_SIZ + 1
+		    || strcmp(d->d_name + (namesz - _EXT_EXPORT_SIZ),
+			      _EXT_EXPORT))
+			continue;
+
+		fname_len = snprintf(fname, PATH_MAX +1, "%s/%s", dname, d->d_name);
+		if (fname_len > PATH_MAX) {
+			xlog(L_WARNING, "Too long file name: %s in %s", d->d_name, dname);
+			continue;
+		}
+
+		volumes += export_read(fname, ignore_hosts);
+	}
+
+	for (i = 0; i < n; i++)
+		free(namelist[i]);
+	free(namelist);
+
+	return volumes;
+}
+
+/**
+ * export_create - create an in-core nfs_export record from an export entry
+ * @xep: export entry to lookup
+ * @canonical: if set, e_hostname is known to be canonical DNS name
+ *
+ * Returns a freshly instantiated export record, or NULL if
+ * a problem occurred.
+ */
+nfs_export *
+export_create(struct exportent *xep, int canonical)
+{
+	nfs_client	*clp;
+	nfs_export	*exp;
+
+	if (!(clp = client_lookup(xep->e_hostname, canonical))) {
+		/* bad export entry; complaint already logged */
+		return NULL;
+	}
+	exp = (nfs_export *) xmalloc(sizeof(*exp));
+	export_init(exp, clp, xep);
+	export_add(exp);
+
+	return exp;
+}
+
+static void
+export_init(nfs_export *exp, nfs_client *clp, struct exportent *nep)
+{
+	struct exportent	*e = &exp->m_export;
+
+	dupexportent(e, nep);
+	if (nep->e_hostname)
+		e->e_hostname = xstrdup(nep->e_hostname);
+
+	exp->m_exported = 0;
+	exp->m_xtabent = 0;
+	exp->m_mayexport = 0;
+	exp->m_changed = 0;
+	exp->m_warned = 0;
+	exp->m_client = clp;
+	clp->m_count++;
+}
+
+/*
+ * Duplicate exports data. The in-core export struct retains the
+ * original hostname from /etc/exports, while the in-core client struct
+ * gets the newly found FQDN.
+ */
+static nfs_export *
+export_dup(nfs_export *exp, const struct addrinfo *ai)
+{
+	nfs_export		*new;
+	nfs_client		*clp;
+
+	new = (nfs_export *) xmalloc(sizeof(*new));
+	memcpy(new, exp, sizeof(*new));
+	dupexportent(&new->m_export, &exp->m_export);
+	if (exp->m_export.e_hostname)
+		new->m_export.e_hostname = xstrdup(exp->m_export.e_hostname);
+	clp = client_dup(exp->m_client, ai);
+	if (clp == NULL) {
+		export_free(new);
+		return NULL;
+	}
+	clp->m_count++;
+	new->m_client = clp;
+	new->m_mayexport = exp->m_mayexport;
+	new->m_exported = 0;
+	new->m_xtabent = 0;
+	new->m_changed = 0;
+	new->m_warned = 0;
+	export_add(new);
+
+	return new;
+}
+
+static void
+export_add(nfs_export *exp)
+{
+	exp_hash_table *p_tbl;
+	exp_hash_entry *p_hen;
+	nfs_export *p_next;
+
+	int type = exp->m_client->m_type;
+	int pos;
+
+	pos = export_hash(exp->m_export.e_path);
+	p_tbl = &(exportlist[type]); /* pointer to hash table */
+	p_hen = &(p_tbl->entries[pos]); /* pointer to hash table entry */
+
+	if (!(p_hen->p_first)) { /* hash table entry is empty */ 
+ 		p_hen->p_first = exp;
+ 		p_hen->p_last  = exp;
+
+ 		exp->m_next = p_tbl->p_head;
+ 		p_tbl->p_head = exp;
+	} else { /* hash table entry is NOT empty */
+		p_next = p_hen->p_last->m_next;
+		p_hen->p_last->m_next = exp;
+		exp->m_next = p_next;
+		p_hen->p_last = exp;
+	}
+}
+
+/**
+ * export_find - find or create a suitable nfs_export for @ai and @path
+ * @ai: pointer to addrinfo for client
+ * @path: '\0'-terminated ASCII string containing export path
+ *
+ * Returns a pointer to nfs_export data matching @ai and @path,
+ * or NULL if an error occurs.
+ */
+nfs_export *
+export_find(const struct addrinfo *ai, const char *path)
+{
+	nfs_export	*exp;
+	int		i;
+
+	for (i = 0; i < MCL_MAXTYPES; i++) {
+		for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+			if (!export_check(exp, ai, path))
+				continue;
+			if (exp->m_client->m_type == MCL_FQDN)
+				return exp;
+			return export_dup(exp, ai);
+		}
+	}
+
+	return NULL;
+}
+
+/**
+ * export_lookup - search hash table for export entry
+ * @hname: '\0'-terminated ASCII string containing client hostname to look for
+ * @path: '\0'-terminated ASCII string containing export path to look for
+ * @canonical: if set, @hname is known to be canonical DNS name
+ *
+ * Returns a pointer to nfs_export record matching @hname and @path,
+ * or NULL if the export was not found.
+ */
+nfs_export *
+export_lookup(char *hname, char *path, int canonical)
+{
+	nfs_client *clp;
+	nfs_export *exp;
+	exp_hash_entry *p_hen;
+
+	int pos;
+
+	clp = client_lookup(hname, canonical);
+	if(clp == NULL)
+		return NULL;
+
+	pos = export_hash(path);
+	p_hen = &(exportlist[clp->m_type].entries[pos]); 
+	for(exp = p_hen->p_first; exp && (exp != p_hen->p_last->m_next); 
+  			exp = exp->m_next) {
+		if (exp->m_client == clp && !strcmp(exp->m_export.e_path, path)) {
+  			return exp;
+		}
+	}
+	return NULL;
+}
+
+static int
+export_check(const nfs_export *exp, const struct addrinfo *ai, const char *path)
+{
+	if (strcmp(path, exp->m_export.e_path))
+		return 0;
+
+	return client_check(exp->m_client, ai);
+}
+
+/**
+ * export_freeall - deallocate all nfs_export records
+ *
+ */
+void
+export_freeall(void)
+{
+	nfs_export	*exp, *nxt;
+	int		i, j;
+
+	for (i = 0; i < MCL_MAXTYPES; i++) {
+		for (exp = exportlist[i].p_head; exp; exp = nxt) {
+			nxt = exp->m_next;
+			client_release(exp->m_client);
+			export_free(exp);
+		}
+		for (j = 0; j < HASH_TABLE_SIZE; j++) {
+			exportlist[i].entries[j].p_first = NULL;
+			exportlist[i].entries[j].p_last = NULL;
+		}
+		exportlist[i].p_head = NULL;
+	}
+	client_freeall();
+}
+
+/*
+ * Compute and returns integer from string. 
+ * Note: Its understood the smae integers can be same for 
+ *       different strings, but it should not matter.
+ */
+static unsigned int 
+strtoint(char *str)
+{
+	int i = 0;
+	unsigned int n = 0;
+
+	while ( str[i] != '\0') {
+		n+=((int)str[i])*i;
+		i++;
+	}
+	return n;
+}
+
+/*
+ * Hash function
+ */
+static int 
+export_hash(char *str)
+{
+	unsigned int num = strtoint(str);
+
+	return num % HASH_TABLE_SIZE;
+}
+
+int export_test(struct exportent *eep, int with_fsid)
+{
+	char *path = eep->e_path;
+	int flags = eep->e_flags | (with_fsid ? NFSEXP_FSID : 0);
+	/* beside max path, buf size should take protocol str into account */
+	char buf[NFS_MAXPATHLEN+1+64] = { 0 };
+	char *bp = buf;
+	int len = sizeof(buf);
+	int fd, n;
+
+	n = snprintf(buf, len, "-test-client- ");
+	bp += n;
+	len -= n;
+	qword_add(&bp, &len, path);
+	if (len < 1)
+		return 0;
+	snprintf(bp, len, " 3 %d 65534 65534 0\n", flags);
+	fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
+	if (fd < 0)
+		return 0;
+	n = nfsd_path_write(fd, buf, strlen(buf));
+	close(fd);
+	if (n < 0)
+		return 0;
+	return 1;
+}
diff --git a/support/export/export.h b/support/export/export.h
new file mode 100644
index 0000000..e2009cc
--- /dev/null
+++ b/support/export/export.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2021 Red Hat <nfs@redhat.com>
+ *
+ * support/export/export.h
+ *
+ * Declarations for export support
+ */
+
+#ifndef EXPORT_H
+#define EXPORT_H
+
+#include "nfslib.h"
+#include "exportfs.h"
+
+unsigned int	auth_reload(void);
+nfs_export *	auth_authenticate(const char *what,
+					const struct sockaddr *caller,
+					const char *path);
+
+void		cache_open(void);
+void		cache_set_fds(fd_set *fdset);
+int		cache_process_req(fd_set *readfds);
+void		cache_process_loop(void);
+
+void		v4clients_init(void);
+void		v4clients_set_fds(fd_set *fdset);
+int		v4clients_process(fd_set *fdset);
+
+struct nfs_fh_len *
+		cache_get_filehandle(nfs_export *exp, int len, char *p);
+int		cache_export(nfs_export *exp, char *path);
+int		cache_fork_workers(char *prog, int num_threads);
+void		cache_wait_for_workers(char *prog);
+int		cache_process(fd_set *readfds);
+
+bool ipaddr_client_matches(nfs_export *exp, struct addrinfo *ai);
+bool namelist_client_matches(nfs_export *exp, char *dom);
+bool client_matches(nfs_export *exp, char *dom, struct addrinfo *ai);
+
+static inline bool is_ipaddr_client(char *dom)
+{
+	return dom[0] == '$';
+}
+#endif /* EXPORT__H */
diff --git a/support/export/fsloc.c b/support/export/fsloc.c
new file mode 100644
index 0000000..1b869b6
--- /dev/null
+++ b/support/export/fsloc.c
@@ -0,0 +1,203 @@
+/*
+ * COPYRIGHT (c) 2006
+ * THE REGENTS OF THE UNIVERSITY OF MICHIGAN
+ * ALL RIGHTS RESERVED
+ *
+ * Permission is granted to use, copy, create derivative works
+ * and redistribute this software and such derivative works
+ * for any purpose, so long as the name of The University of
+ * Michigan is not used in any advertising or publicity
+ * pertaining to the use of distribution of this software
+ * without specific, written prior authorization.  If the
+ * above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any
+ * portion of this software, then the disclaimer below must
+ * also be included.
+ *
+ * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
+ * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
+ * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
+ * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
+ * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+ * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
+ * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
+ * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
+ * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGES.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+
+#include "fsloc.h"
+#include "exportfs.h"
+
+/* Debugging tool: prints out @servers info to syslog */
+static void replicas_print(struct servers *sp)
+{
+	int i;
+	if (!sp) {
+		xlog(L_NOTICE, "NULL replicas pointer");
+		return;
+	}
+	xlog(L_NOTICE, "replicas listsize=%i", sp->h_num);
+	for (i=0; i<sp->h_num; i++) {
+		xlog(L_NOTICE, "    %s:%s",
+		       sp->h_mp[i]->h_host, sp->h_mp[i]->h_path);
+	}
+}
+
+#ifdef DEBUG
+/* Called by setting 'Method = stub' in config file.  Just returns
+ * some syntactically correct gibberish for testing purposes.
+ */
+static struct servers *method_stub(char *key)
+{
+	struct servers *sp;
+	struct mount_point *mp;
+
+	xlog(L_NOTICE, "called method_stub\n");
+	sp = malloc(sizeof(struct servers));
+	if (!sp)
+		return NULL;
+	mp = calloc(1, sizeof(struct mount_point));
+	if (!mp) {
+		free(sp);
+		return NULL;
+	}
+	sp->h_num = 1;
+	sp->h_mp[0] = mp;
+	mp->h_host = strdup("stub_server");
+	mp->h_path = strdup("/my/test/path");
+	sp->h_referral = 1;
+	return sp;
+}
+#endif	/* DEBUG */
+
+/* Scan @list, which is a NULL-terminated array of strings of the
+ * form path@host[+host], and return corresponding servers structure.
+ */
+static struct servers *parse_list(char **list)
+{
+	int i;
+	struct servers *res;
+	struct mount_point *mp;
+	char *cp;
+
+	res = malloc(sizeof(struct servers));
+	if (!res)
+		return NULL;
+	res->h_num = 0;
+
+	/* parse each of the answers in sucession. */
+	for (i=0; list[i] && i<FSLOC_MAX_LIST; i++) {
+		mp = calloc(1, sizeof(struct mount_point));
+		if (!mp) {
+			release_replicas(res);
+			return NULL;
+		}
+		cp = strchr(list[i], '@');
+		if ((!cp) || list[i][0] != '/') {
+			xlog(L_WARNING, "invalid entry '%s'", list[i]);
+			free(mp);
+			continue; /* XXX Need better error handling */
+		}
+		res->h_mp[i] = mp;
+		res->h_num++;
+		mp->h_path = strndup(list[i], cp - list[i]);
+		cp++;
+		mp->h_host = strdup(cp);
+		/* hosts are '+' separated, kernel expects ':' separated */
+		while ( (cp = strchr(mp->h_host, '+')) )
+		       *cp = ':';
+	}
+	return res;
+}
+
+/* @data is a string of form path@host[+host][:path@host[+host]]
+ */
+static struct servers *method_list(char *data)
+{
+	char *copy, *ptr=data, *p;
+	char **list;
+	int i, listsize;
+	struct servers *rv=NULL;
+	bool v6esc = false;
+
+	xlog(L_NOTICE, "method_list(%s)", data);
+	for (ptr--, listsize=1; ptr; ptr=strchr(ptr, ':'), listsize++)
+		ptr++;
+	list = malloc(listsize * sizeof(char *));
+	copy = strdup(data);
+	if (copy)
+		xlog(L_NOTICE, "converted to %s", copy);
+	if (list && copy) {
+		ptr = copy;
+		for (p = ptr, i = 0; *p && i < listsize; p++) {
+			if (*p == '[')
+				v6esc = true;
+			else if (*p == ']')
+				v6esc = false;
+
+			if (!v6esc && *p == ':') {
+				*p = '\0';
+				if (*ptr)
+					list[i++] = ptr;
+				ptr = p + 1;
+			}
+		}
+		if (*ptr)
+			list[i++] = ptr;
+		list[i] = NULL;
+		rv = parse_list(list);
+	}
+	free(copy);
+	free(list);
+	replicas_print(rv);
+	return rv;
+}
+
+/* Returns appropriately filled struct servers, or NULL if had a problem */
+struct servers *replicas_lookup(int method, char *data)
+{
+	struct servers *sp=NULL;
+	switch(method) {
+	case FSLOC_NONE:
+		break;
+	case FSLOC_REFER:
+		sp = method_list(data);
+		if (sp)
+			sp->h_referral = 1;
+		break;
+	case FSLOC_REPLICA:
+		sp = method_list(data);
+		if (sp)
+			sp->h_referral = 0;
+		break;
+#ifdef DEBUG
+	case FSLOC_STUB:
+		sp = method_stub(data);
+		break;
+#endif
+	default:
+		xlog(L_WARNING, "Unknown method = %i", method);
+	}
+	replicas_print(sp);
+	return sp;
+}
+
+void release_replicas(struct servers *server)
+{
+	int i;
+
+	if (!server) return;
+	for (i = 0; i < server->h_num; i++) {
+		free(server->h_mp[i]->h_host);
+		free(server->h_mp[i]->h_path);
+		free(server->h_mp[i]);
+	}
+	free(server);
+}
diff --git a/support/export/hostname.c b/support/export/hostname.c
new file mode 100644
index 0000000..be4d7f6
--- /dev/null
+++ b/support/export/hostname.c
@@ -0,0 +1,366 @@
+/*
+ * Copyright 2010 Oracle.  All rights reserved.
+ *
+ * This file is part of nfs-utils.
+ *
+ * nfs-utils is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * nfs-utils 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with nfs-utils.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <errno.h>
+
+#include "sockaddr.h"
+#include "exportfs.h"
+
+/**
+ * host_ntop - generate presentation address given a sockaddr
+ * @sap: pointer to socket address
+ * @buf: working storage
+ * @buflen: size of @buf in bytes
+ *
+ * Returns a pointer to a @buf.
+ */
+#ifdef HAVE_GETNAMEINFO
+char *
+host_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
+{
+	socklen_t salen = nfs_sockaddr_length(sap);
+	int error;
+
+	memset(buf, 0, buflen);
+
+	if (salen == 0) {
+		(void)strncpy(buf, "bad family", buflen - 1);
+		return buf;
+	}
+
+	error = getnameinfo(sap, salen, buf, (socklen_t)buflen,
+						NULL, 0, NI_NUMERICHOST);
+	if (error != 0) {
+		buf[0] = '\0';
+		(void)strncpy(buf, "bad address", buflen - 1);
+	}
+
+	return buf;
+}
+#else	/* !HAVE_GETNAMEINFO */
+char *
+host_ntop(const struct sockaddr *sap, char *buf, const size_t buflen)
+{
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)(char *)sap;
+
+	memset(buf, 0, buflen);
+
+	if (sin->sin_family != AF_INET) {
+		(void)strncpy(buf, "bad family", buflen - 1);
+		return buf;
+	}
+
+	if (inet_ntop(AF_INET, &sin->sin_addr.s_addr, buf, buflen) != NULL)
+		return buf;
+
+	buf[0] = '\0';
+	(void)strncpy(buf, "bad address", buflen - 1);
+	return buf;
+}
+#endif	/* !HAVE_GETNAMEINFO */
+
+/**
+ * host_pton - return addrinfo for a given presentation address
+ * @paddr: pointer to a '\0'-terminated ASCII string containing an
+ *		IP presentation address
+ *
+ * Returns address info structure, or NULL if an error occurs.  Caller
+ * must free the returned structure with freeaddrinfo(3).
+ */
+__attribute__((__malloc__))
+struct addrinfo *
+host_pton(const char *paddr)
+{
+	struct addrinfo *ai = NULL;
+	struct addrinfo hint = {
+		/* don't return duplicates */
+		.ai_protocol	= (int)IPPROTO_UDP,
+		.ai_flags	= AI_NUMERICHOST,
+		.ai_family	= AF_UNSPEC,
+	};
+	struct sockaddr_in sin;
+	int error, inet4;
+
+	/*
+	 * Although getaddrinfo(3) is easier to use and supports
+	 * IPv6, it recognizes incomplete addresses like "10.4"
+	 * as valid AF_INET addresses.  It also accepts presentation
+	 * addresses that end with a blank.
+	 *
+	 * inet_pton(3) is much stricter.  Use it to be certain we
+	 * have a real AF_INET presentation address, before invoking
+	 * getaddrinfo(3) to generate the full addrinfo list.
+	 */
+	if (paddr == NULL) {
+		xlog(D_GENERAL, "%s: passed a NULL presentation address",
+			__func__);
+		return NULL;
+	}
+	inet4 = 1;
+	if (inet_pton(AF_INET, paddr, &sin.sin_addr) == 0)
+		inet4 = 0;
+
+	error = getaddrinfo(paddr, NULL, &hint, &ai);
+	switch (error) {
+	case 0:
+		if (!inet4 && ai->ai_addr->sa_family == AF_INET) {
+			xlog(D_GENERAL, "%s: failed to convert %s",
+					__func__, paddr);
+			nfs_freeaddrinfo(ai);
+			break;
+		}
+		return ai;
+	case EAI_NONAME:
+		break;
+	case EAI_SYSTEM:
+		xlog(L_WARNING, "%s: failed to convert %s: (%d) %m",
+				__func__, paddr, errno);
+		break;
+	default:
+		xlog(L_WARNING, "%s: failed to convert %s: %s",
+				__func__, paddr, gai_strerror(error));
+		break;
+	}
+
+	return NULL;
+}
+
+/**
+ * host_addrinfo - return addrinfo for a given hostname
+ * @hostname: pointer to a '\0'-terminated ASCII string containing a hostname
+ *
+ * Returns address info structure with ai_canonname filled in, or NULL
+ * if no information is available for @hostname.  Caller must free the
+ * returned structure with freeaddrinfo(3).
+ */
+__attribute__((__malloc__))
+struct addrinfo *
+host_addrinfo(const char *hostname)
+{
+	struct addrinfo *ai = NULL;
+	struct addrinfo hint = {
+#ifdef IPV6_SUPPORTED
+		.ai_family	= AF_UNSPEC,
+#else
+		.ai_family	= AF_INET,
+#endif
+		/* don't return duplicates */
+		.ai_protocol	= (int)IPPROTO_UDP,
+		.ai_flags	= AI_CANONNAME,
+	};
+	int error;
+
+	error = getaddrinfo(hostname, NULL, &hint, &ai);
+	switch (error) {
+	case 0:
+		return ai;
+	case EAI_SYSTEM:
+		xlog(D_PARSE, "%s: failed to resolve %s: (%d) %m",
+				__func__, hostname, errno);
+		break;
+	default:
+		xlog(D_PARSE, "%s: failed to resolve %s: %s",
+				__func__, hostname, gai_strerror(error));
+		break;
+	}
+
+	return NULL;
+}
+
+/**
+ * host_canonname - return canonical hostname bound to an address
+ * @sap: pointer to socket address to look up
+ *
+ * Discover the canonical hostname associated with the given socket
+ * address.  The host's reverse mapping is verified in the process.
+ *
+ * Returns a '\0'-terminated ASCII string containing a hostname, or
+ * NULL if no hostname can be found for @sap.  Caller must free
+ * the string.
+ */
+#ifdef HAVE_GETNAMEINFO
+__attribute__((__malloc__))
+char *
+host_canonname(const struct sockaddr *sap)
+{
+	socklen_t salen = nfs_sockaddr_length(sap);
+	char buf[NI_MAXHOST];
+	int error;
+
+	if (salen == 0) {
+		xlog(D_GENERAL, "%s: unsupported address family %d",
+				__func__, sap->sa_family);
+		return NULL;
+	}
+
+	memset(buf, 0, sizeof(buf));
+	error = getnameinfo(sap, salen, buf, (socklen_t)sizeof(buf),
+							NULL, 0, NI_NAMEREQD);
+	switch (error) {
+	case 0:
+		break;
+	case EAI_SYSTEM:
+		xlog(D_GENERAL, "%s: getnameinfo(3) failed: (%d) %m",
+				__func__, errno);
+		return NULL;
+	default:
+		(void)getnameinfo(sap, salen, buf, (socklen_t)sizeof(buf),
+							NULL, 0, NI_NUMERICHOST);
+		xlog(D_PARSE, "%s: failed to resolve %s: %s",
+				__func__, buf, gai_strerror(error));
+		return NULL;
+	}
+
+	return strdup(buf);
+}
+#else	/* !HAVE_GETNAMEINFO */
+__attribute__((__malloc__))
+char *
+host_canonname(const struct sockaddr *sap)
+{
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)(char *)sap;
+	const struct in_addr *addr = &sin->sin_addr;
+	struct hostent *hp;
+
+	if (sap->sa_family != AF_INET)
+		return NULL;
+
+	hp = gethostbyaddr(addr, (socklen_t)sizeof(addr), AF_INET);
+	if (hp == NULL)
+		return NULL;
+
+	return strdup(hp->h_name);
+}
+#endif	/* !HAVE_GETNAMEINFO */
+
+/**
+ * host_reliable_addrinfo - return addrinfo for a given address
+ * @sap: pointer to socket address to look up
+ *
+ * Reverse and forward lookups are performed to ensure the address has
+ * matching forward and reverse mappings.
+ *
+ * Returns addrinfo structure with just the provided address. If there
+ * is a problem with resolution or the resolved records don't match up
+ * properly then returns NULL.
+ *
+ * Caller must free the returned structure with freeaddrinfo(3).
+ */
+__attribute__((__malloc__))
+struct addrinfo *
+host_reliable_addrinfo(const struct sockaddr *sap)
+{
+	struct addrinfo *ai, *a;
+	char *hostname;
+
+	ai = NULL;
+	hostname = host_canonname(sap);
+	if (hostname == NULL)
+		goto out;
+
+	ai = host_addrinfo(hostname);
+	free(hostname);
+	if (!ai)
+		goto out;
+
+	/* make sure there's a matching address in the list */
+	for (a = ai; a; a = a->ai_next)
+		if (nfs_compare_sockaddr(a->ai_addr, sap))
+			break;
+
+	nfs_freeaddrinfo(ai);
+	ai = NULL;
+	if (!a)
+		goto out;
+
+	/* get addrinfo with just the original address */
+	ai = host_numeric_addrinfo(sap);
+
+out:
+	return ai;
+}
+
+/**
+ * host_numeric_addrinfo - return addrinfo without doing DNS queries
+ * @sap: pointer to socket address
+ *
+ * Returns address info structure, or NULL if an error occurred.
+ * Caller must free the returned structure with freeaddrinfo(3).
+ */
+#ifdef HAVE_GETNAMEINFO
+__attribute__((__malloc__))
+struct addrinfo *
+host_numeric_addrinfo(const struct sockaddr *sap)
+{
+	socklen_t salen = nfs_sockaddr_length(sap);
+	char buf[INET6_ADDRSTRLEN];
+	int error;
+
+	if (salen == 0) {
+		xlog(D_GENERAL, "%s: unsupported address family %d",
+				__func__, sap->sa_family);
+		return NULL;
+	}
+
+	memset(buf, 0, sizeof(buf));
+	error = getnameinfo(sap, salen, buf, (socklen_t)sizeof(buf),
+						NULL, 0, NI_NUMERICHOST);
+	switch (error) {
+	case 0:
+		break;
+	case EAI_SYSTEM:
+		xlog(D_GENERAL, "%s: getnameinfo(3) failed: (%d) %m",
+				__func__, errno);
+		return NULL;
+	default:
+		xlog(D_GENERAL, "%s: getnameinfo(3) failed: %s",
+				__func__, gai_strerror(error));
+		return NULL;
+	}
+
+	return host_pton(buf);
+}
+#else	/* !HAVE_GETNAMEINFO */
+__attribute__((__malloc__))
+struct addrinfo *
+host_numeric_addrinfo(const struct sockaddr *sap)
+{
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
+	const struct in_addr *addr = &sin->sin_addr;
+	char buf[INET_ADDRSTRLEN];
+
+	if (sap->sa_family != AF_INET)
+		return NULL;
+
+	memset(buf, 0, sizeof(buf));
+	if (inet_ntop(AF_INET, (char *)addr, buf,
+					(socklen_t)sizeof(buf)) == NULL)
+		return NULL;
+
+	return host_pton(buf);
+}
+#endif	/* !HAVE_GETNAMEINFO */
diff --git a/support/export/mount.x b/support/export/mount.x
new file mode 100644
index 0000000..12fd841
--- /dev/null
+++ b/support/export/mount.x
@@ -0,0 +1,343 @@
+%/*
+% * Copyright (c) 2009, Sun Microsystems, Inc.
+% * All rights reserved.
+% *
+% * Redistribution and use in source and binary forms, with or without
+% * modification, are permitted provided that the following conditions are met:
+% * - Redistributions of source code must retain the above copyright notice,
+% *   this list of conditions and the following disclaimer.
+% * - Redistributions in binary form must reproduce the above copyright notice,
+% *   this list of conditions and the following disclaimer in the documentation
+% *   and/or other materials provided with the distribution.
+% * - Neither the name of Sun Microsystems, Inc. nor the names of its
+% *   contributors may be used to endorse or promote products derived
+% *   from this software without specific prior written permission.
+% *
+% * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+% * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+% * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+% * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+% * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+% * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+% * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+% * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+% * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+% * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+% * POSSIBILITY OF SUCH DAMAGE.
+% */
+
+%/*
+% * Copyright (c) 1985, 1990 by Sun Microsystems, Inc.
+% */
+%
+%/* from @(#)mount.x	1.3 91/03/11 TIRPC 1.0 */
+
+/*
+ * Protocol description for the mount program
+ */
+
+#ifdef RPC_HDR
+%#ifndef _rpcsvc_mount_h
+%#define _rpcsvc_mount_h
+%#include <memory.h>
+#endif
+
+const MNTPATHLEN = 1024;	/* maximum bytes in a pathname argument */
+const MNTNAMLEN = 255;		/* maximum bytes in a name argument */
+const FHSIZE = 32;		/* size in bytes of a file handle */
+
+/*
+ * The fhandle is the file handle that the server passes to the client.
+ * All file operations are done using the file handles to refer to a file
+ * or a directory. The file handle can contain whatever information the
+ * server needs to distinguish an individual file.
+ */
+typedef opaque fhandle[FHSIZE];	
+
+/*
+ * If a status of zero is returned, the call completed successfully, and 
+ * a file handle for the directory follows. A non-zero status indicates
+ * some sort of error. The status corresponds with UNIX error numbers.
+ */
+union fhstatus switch (unsigned fhs_status) {
+case 0:
+	fhandle fhs_fhandle;
+default:
+	void;
+};
+
+/*
+ * The type dirpath is the pathname of a directory
+ */
+typedef string dirpath<MNTPATHLEN>;
+
+/*
+ * The type name is used for arbitrary names (hostnames, groupnames)
+ */
+typedef string name<MNTNAMLEN>;
+
+/*
+ * A list of who has what mounted
+ */
+typedef struct mountbody *mountlist;
+struct mountbody {
+	name ml_hostname;
+	dirpath ml_directory;
+	mountlist ml_next;
+};
+
+/*
+ * A list of netgroups
+ */
+typedef struct groupnode *groups;
+struct groupnode {
+	name gr_name;
+	groups gr_next;
+};
+
+/*
+ * A list of what is exported and to whom
+ */
+typedef struct exportnode *exports;
+struct exportnode {
+	dirpath ex_dir;
+	groups ex_groups;
+	exports ex_next;
+};
+
+/*
+ * POSIX pathconf information
+ */
+struct ppathcnf {
+	int	pc_link_max;	/* max links allowed */
+	short	pc_max_canon;	/* max line len for a tty */
+	short	pc_max_input;	/* input a tty can eat all at once */
+	short	pc_name_max;	/* max file name length (dir entry) */
+	short	pc_path_max;	/* max path name length (/x/y/x/.. ) */
+	short	pc_pipe_buf;	/* size of a pipe (bytes) */
+	u_char	pc_vdisable;	/* safe char to turn off c_cc[i] */
+	char	pc_xxx;		/* alignment padding; cc_t == char */
+	short	pc_mask[2];	/* validity and boolean bits */
+};
+
+/*
+ * NFSv3 file handle
+ */
+const FHSIZE3 =	64;		/* max size of NFSv3 file handle in bytes */
+typedef opaque		fhandle3<FHSIZE3>;
+
+/*
+ * NFSv3 mount status
+ */
+enum mountstat3 {
+	MNT_OK			= 0,	/* no error */
+	MNT3ERR_PERM		= 1,	/* not owner */
+	MNT3ERR_NOENT		= 2,	/* no such file or directory */
+	MNT3ERR_IO		= 5,	/* I/O error */
+	MNT3ERR_ACCES		= 13,	/* Permission denied */
+	MNT3ERR_NOTDIR		= 20,	/* Not a directory */
+	MNT3ERR_INVAL		= 22,	/* Invalid argument */
+	MNT3ERR_NAMETOOLONG	= 63,	/* File name too long */
+	MNT3ERR_NOTSUPP		= 10004,/* Operation not supported */
+	MNT3ERR_SERVERFAULT	= 10006	/* A failure on the server */
+};
+
+/*
+ * NFSv3 mount result
+ */
+struct mountres3_ok {
+	fhandle3	fhandle;
+	int		auth_flavors<>;
+};
+
+union mountres3 switch (mountstat3 fhs_status) {
+case MNT_OK:
+	mountres3_ok	mountinfo; /* File handle and supported flavors */
+default:
+	void;
+};
+
+program MOUNTPROG {
+	/*
+	 * Version one of the mount protocol communicates with version two
+	 * of the NFS protocol. The only connecting point is the fhandle 
+	 * structure, which is the same for both protocols.
+	 */
+	version MOUNTVERS {
+		/*
+		 * Does no work. It is made available in all RPC services
+		 * to allow server reponse testing and timing
+		 */
+		void
+		MOUNTPROC_NULL(void) = 0;
+
+		/*	
+		 * If fhs_status is 0, then fhs_fhandle contains the
+	 	 * file handle for the directory. This file handle may
+		 * be used in the NFS protocol. This procedure also adds
+		 * a new entry to the mount list for this client mounting
+		 * the directory.
+		 * Unix authentication required.
+		 */
+		fhstatus 
+		MOUNTPROC_MNT(dirpath) = 1;
+
+		/*
+		 * Returns the list of remotely mounted filesystems. The 
+		 * mountlist contains one entry for each hostname and 
+		 * directory pair.
+		 */
+		mountlist
+		MOUNTPROC_DUMP(void) = 2;
+
+		/*
+		 * Removes the mount list entry for the directory
+		 * Unix authentication required.
+		 */
+		void
+		MOUNTPROC_UMNT(dirpath) = 3;
+
+		/*
+		 * Removes all of the mount list entries for this client
+		 * Unix authentication required.
+		 */
+		void
+		MOUNTPROC_UMNTALL(void) = 4;
+
+		/*
+		 * Returns a list of all the exported filesystems, and which
+		 * machines are allowed to import it.
+		 */
+		exports
+		MOUNTPROC_EXPORT(void)  = 5;
+
+		/*
+		 * Identical to MOUNTPROC_EXPORT above
+		 */
+		exports
+		MOUNTPROC_EXPORTALL(void) = 6;
+	} = 1;
+
+	/*
+	 * Version two of the mount protocol communicates with version two
+	 * of the NFS protocol.
+	 * The only difference from version one is the addition of a POSIX
+	 * pathconf call.
+	 */
+	version MOUNTVERS_POSIX {
+		/*
+		 * Does no work. It is made available in all RPC services
+		 * to allow server reponse testing and timing
+		 */
+		void
+		MOUNTPROC_NULL(void) = 0;
+
+		/*	
+		 * If fhs_status is 0, then fhs_fhandle contains the
+	 	 * file handle for the directory. This file handle may
+		 * be used in the NFS protocol. This procedure also adds
+		 * a new entry to the mount list for this client mounting
+		 * the directory.
+		 * Unix authentication required.
+		 */
+		fhstatus 
+		MOUNTPROC_MNT(dirpath) = 1;
+
+		/*
+		 * Returns the list of remotely mounted filesystems. The 
+		 * mountlist contains one entry for each hostname and 
+		 * directory pair.
+		 */
+		mountlist
+		MOUNTPROC_DUMP(void) = 2;
+
+		/*
+		 * Removes the mount list entry for the directory
+		 * Unix authentication required.
+		 */
+		void
+		MOUNTPROC_UMNT(dirpath) = 3;
+
+		/*
+		 * Removes all of the mount list entries for this client
+		 * Unix authentication required.
+		 */
+		void
+		MOUNTPROC_UMNTALL(void) = 4;
+
+		/*
+		 * Returns a list of all the exported filesystems, and which
+		 * machines are allowed to import it.
+		 */
+		exports
+		MOUNTPROC_EXPORT(void)  = 5;
+
+		/*
+		 * Identical to MOUNTPROC_EXPORT above
+		 */
+		exports
+		MOUNTPROC_EXPORTALL(void) = 6;
+
+		/*
+		 * POSIX pathconf info (Sun hack)
+		 */
+		ppathcnf
+		MOUNTPROC_PATHCONF(dirpath) = 7;
+	} = 2;
+
+	/*
+	 * Version 3 of the protocol is for NFSv3
+	 */
+	version MOUNTVERS_NFSV3 {
+		/*
+		 * Does no work. It is made available in all RPC services
+		 * to allow server reponse testing and timing
+		 */
+		void
+		MOUNTPROC3_NULL(void) = 0;
+
+		/*	
+		 * If fhs_status is 0, then fhs_fhandle contains the
+	 	 * file handle for the directory. This file handle may
+		 * be used in the NFS protocol. This procedure also adds
+		 * a new entry to the mount list for this client mounting
+		 * the directory.
+		 * Unix authentication required.
+		 */
+		mountres3 
+		MOUNTPROC3_MNT(dirpath) = 1;
+
+		/*
+		 * Returns the list of remotely mounted filesystems. The 
+		 * mountlist contains one entry for each hostname and 
+		 * directory pair.
+		 */
+		mountlist
+		MOUNTPROC3_DUMP(void) = 2;
+
+		/*
+		 * Removes the mount list entry for the directory
+		 * Unix authentication required.
+		 */
+		void
+		MOUNTPROC3_UMNT(dirpath) = 3;
+
+		/*
+		 * Removes all of the mount list entries for this client
+		 * Unix authentication required.
+		 */
+		void
+		MOUNTPROC3_UMNTALL(void) = 4;
+
+		/*
+		 * Returns a list of all the exported filesystems, and which
+		 * machines are allowed to import it.
+		 */
+		exports
+		MOUNTPROC3_EXPORT(void)  = 5;
+	} = 3;
+} = 100005;
+
+#ifdef RPC_HDR
+%#endif /*!_rpcsvc_mount_h*/
+#endif
diff --git a/support/export/v4clients.c b/support/export/v4clients.c
new file mode 100644
index 0000000..3230251
--- /dev/null
+++ b/support/export/v4clients.c
@@ -0,0 +1,233 @@
+/*
+ * support/export/v4clients.c
+ *
+ * Montior clients appearing in, and disappearing from, /proc/fs/nfsd/clients
+ * and log relevant information.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/inotify.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include "export.h"
+
+/* search.h declares 'struct entry' and nfs_prot.h
+ * does too.  Easiest fix is to trick search.h into
+ * calling its struct "struct Entry".
+ */
+#define entry Entry
+#include <search.h>
+#undef entry
+
+static int clients_fd = -1;
+
+void v4clients_init(void)
+{
+	struct stat sb;
+
+	if (stat("/proc/fs/nfsd/clients", &sb) != 0 ||
+	    !S_ISDIR(sb.st_mode))
+		return;
+	if (clients_fd >= 0)
+		return;
+	clients_fd = inotify_init1(IN_NONBLOCK);
+	if (clients_fd < 0) {
+		xlog_err("Unable to initialise v4clients watcher: %s\n",
+			 strerror(errno));
+		return;
+	}
+	if (inotify_add_watch(clients_fd, "/proc/fs/nfsd/clients",
+			      IN_CREATE | IN_DELETE) < 0) {
+		xlog_err("Unable to watch /proc/fs/nfsd/clients: %s\n",
+			 strerror(errno));
+		close(clients_fd);
+		clients_fd = -1;
+		return;
+	}
+}
+
+void v4clients_set_fds(fd_set *fdset)
+{
+	if (clients_fd >= 0)
+		FD_SET(clients_fd, fdset);
+}
+
+static void *tree_root;
+static int have_unconfirmed;
+
+struct ent {
+	unsigned long num;
+	char *clientid;
+	char *addr;
+	int vers;
+	int unconfirmed;
+	int wid;
+};
+
+static int ent_cmp(const void *av, const void *bv)
+{
+	const struct ent *a = av;
+	const struct ent *b = bv;
+
+	if (a->num < b->num)
+		return -1;
+	if (a->num > b->num)
+		return 1;
+	return 0;
+}
+
+static void free_ent(struct ent *ent)
+{
+	free(ent->clientid);
+	free(ent->addr);
+	free(ent);
+}
+
+static char *dup_line(char *line)
+{
+	char *ret;
+	char *e = strchr(line, '\n');
+	if (!e)
+		e = line + strlen(line);
+	ret = malloc(e - line + 1);
+	if (ret) {
+		memcpy(ret, line, e - line);
+		ret[e-line] = 0;
+	}
+	return ret;
+}
+
+static void read_info(struct ent *key)
+{
+	char buf[2048];
+	char *path;
+	int was_unconfirmed = key->unconfirmed;
+	FILE *f;
+
+	if (asprintf(&path, "/proc/fs/nfsd/clients/%lu/info", key->num) < 0)
+		return;
+
+	f = fopen(path, "r");
+	if (!f) {
+		free(path);
+		return;
+	}
+	if (key->wid < 0)
+		key->wid = inotify_add_watch(clients_fd, path, IN_MODIFY);
+
+	while (fgets(buf, sizeof(buf), f)) {
+		if (strncmp(buf, "clientid: ", 10) == 0) {
+			free(key->clientid);
+			key->clientid = dup_line(buf+10);
+		}
+		if (strncmp(buf, "address: ", 9) == 0) {
+			free(key->addr);
+			key->addr = dup_line(buf+9);
+		}
+		if (strncmp(buf, "minor version: ", 15) == 0)
+			key->vers = atoi(buf+15);
+		if (strncmp(buf, "status: ", 8) == 0 &&
+		    strstr(buf, " unconfirmed") != NULL) {
+			key->unconfirmed = 1;
+			have_unconfirmed = 1;
+		}
+		if (strncmp(buf, "status: ", 8) == 0 &&
+		    strstr(buf, " confirmed") != NULL)
+			key->unconfirmed = 0;
+	}
+	fclose(f);
+	free(path);
+
+	if (was_unconfirmed && !key->unconfirmed)
+		xlog(L_NOTICE, "v4.%d client attached: %s from %s",
+		     key->vers, key->clientid ?: "-none-",
+		     key->addr ?: "-none-");
+	if (!key->unconfirmed && key->wid >= 0) {
+		inotify_rm_watch(clients_fd, key->wid);
+		key->wid = -1;
+	}
+}
+
+static void add_id(int id)
+{
+	struct ent **ent;
+	struct ent *key;
+
+	key = calloc(1, sizeof(*key));
+	if (!key) {
+		return;
+	}
+	key->num = id;
+	key->wid = -1;
+
+	ent = tsearch(key, &tree_root, ent_cmp);
+
+	if (!ent || *ent != key)
+		/* Already existed, or insertion failed */
+		free_ent(key);
+	else
+		read_info(key);
+}
+
+static void del_id(unsigned long id)
+{
+	struct ent key = {.num = id};
+	struct ent **e, *ent;
+
+	e = tfind(&key, &tree_root, ent_cmp);
+	if (!e || !*e)
+		return;
+	ent = *e;
+	tdelete(ent, &tree_root, ent_cmp);
+	if (!ent->unconfirmed)
+		xlog(L_NOTICE, "v4.%d client detached: %s from %s",
+		     ent->vers, ent->clientid, ent->addr);
+	if (ent->wid >= 0)
+		inotify_rm_watch(clients_fd, ent->wid);
+	free_ent(ent);
+}
+
+static void check_id(unsigned long id)
+{
+	struct ent key = {.num = id};
+	struct ent **e, *ent;
+
+	e = tfind(&key, &tree_root, ent_cmp);
+	if (!e || !*e)
+		return;
+	ent = *e;
+	if (ent->unconfirmed)
+		read_info(ent);
+}
+
+int v4clients_process(fd_set *fdset)
+{
+	char buf[4096] __attribute__((aligned(__alignof__(struct inotify_event))));
+	const struct inotify_event *ev;
+	ssize_t len;
+	char *ptr;
+
+	if (clients_fd < 0 ||
+	    !FD_ISSET(clients_fd, fdset))
+		return 0;
+
+	while ((len = read(clients_fd, buf, sizeof(buf))) > 0) {
+		for (ptr = buf; ptr < buf + len;
+		     ptr += sizeof(struct inotify_event) + ev->len) {
+			int id;
+			ev = (const struct inotify_event *)ptr;
+
+			id = atoi(ev->name);
+			if (id <= 0)
+				continue;
+			if (ev->mask & IN_CREATE)
+				add_id(id);
+			if (ev->mask & IN_DELETE)
+				del_id(id);
+			if (ev->mask & IN_MODIFY)
+				check_id(id);
+		}
+	}
+	return 1;
+}
diff --git a/support/export/v4root.c b/support/export/v4root.c
new file mode 100644
index 0000000..03805dc
--- /dev/null
+++ b/support/export/v4root.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright (C) 2009 Red Hat <nfs@redhat.com>
+ *
+ * support/export/v4root.c
+ *
+ * Routines used to support NFSv4 pseudo roots
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/queue.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include <unistd.h>
+#include <errno.h>
+#include <uuid/uuid.h>
+
+#include "xlog.h"
+#include "exportfs.h"
+#include "nfslib.h"
+#include "misc.h"
+#include "v4root.h"
+#include "pseudoflavors.h"
+
+static nfs_export pseudo_root = {
+	.m_next = NULL,
+	.m_client = NULL,
+	.m_export = {
+		.e_hostname = "*",
+		.e_path = "/",
+		.e_flags = NFSEXP_READONLY
+				| NFSEXP_NOSUBTREECHECK | NFSEXP_FSID
+				| NFSEXP_V4ROOT | NFSEXP_INSECURE_PORT,
+		.e_anonuid = 65534,
+		.e_anongid = 65534,
+		.e_squids = NULL,
+		.e_nsquids = 0,
+		.e_sqgids = NULL,
+		.e_nsqgids = 0,
+		.e_fsid = 0,
+		.e_mountpoint = NULL,
+		.e_ttl = 0,
+	},
+	.m_exported = 0,
+	.m_xtabent = 1,
+	.m_mayexport = 1,
+	.m_changed = 0,
+	.m_warned = 0,
+};
+
+static void
+set_pseudofs_security(struct exportent *pseudo)
+{
+	struct flav_info *flav;
+	int i;
+
+	for (flav = flav_map; flav < flav_map + flav_map_size; flav++) {
+		struct sec_entry *new;
+
+		if (!flav->fnum)
+			continue;
+		if (flav->need_krb5 && access("/etc/krb5.keytab", F_OK) != 0)
+			continue;
+
+		i = secinfo_addflavor(flav, pseudo);
+		new = &pseudo->e_secinfo[i];
+
+		new->flags |= NFSEXP_INSECURE_PORT;
+	}
+}
+
+/*
+ * Create a pseudo export
+ */
+static struct exportent *
+v4root_create(char *path, nfs_export *export)
+{
+	nfs_export *exp;
+	struct exportent eep;
+	struct exportent *curexp = &export->m_export;
+
+	dupexportent(&eep, &pseudo_root.m_export);
+	eep.e_ttl = default_ttl;
+	eep.e_hostname = curexp->e_hostname;
+	strncpy(eep.e_path, path, sizeof(eep.e_path)-1);
+	if (strcmp(path, "/") != 0)
+		eep.e_flags &= ~NFSEXP_FSID;
+
+	if (strcmp(path, "/") != 0 &&
+	    !export_test(&eep, 0)) {
+		/* Need a uuid - base it on path using a fixed seed that
+		 * was generated randomly.
+		 */
+		const char seed_s[] = "39c6b5c1-3f24-4f4e-977c-7fe6546b8a25";
+		uuid_t seed, uuid;
+		char uuid_s[UUID_STR_LEN];
+		unsigned int i, j;
+
+		uuid_parse(seed_s, seed);
+		uuid_generate_sha1(uuid, seed, path, strlen(path));
+		uuid_unparse_upper(uuid, uuid_s);
+		/* strip hyhens */
+		for (i = j = 0; uuid_s[i]; i++)
+			if (uuid_s[i] != '-')
+				uuid_s[j++] = uuid_s[i];
+		eep.e_uuid = uuid_s;
+	}
+	set_pseudofs_security(&eep);
+	exp = export_create(&eep, 0);
+	if (exp == NULL)
+		return NULL;
+	xlog(D_CALL, "v4root_create: path '%s' flags 0x%x",
+		exp->m_export.e_path, exp->m_export.e_flags);
+	return &exp->m_export;
+}
+
+/*
+ * Make sure the kernel has pseudo root support.
+ */
+static int
+v4root_support(void)
+{
+	struct export_features *ef;
+	static int warned = 0;
+
+	ef = get_export_features();
+
+	if (ef->flags & NFSEXP_V4ROOT)
+		return 1;
+	if (!warned) {
+		xlog(L_WARNING, "Kernel does not have pseudo root support.");
+		xlog(L_WARNING, "NFS v4 mounts will be disabled unless fsid=0");
+		xlog(L_WARNING, "is specfied in /etc/exports file.");
+		warned++;
+	}
+	return 0;
+}
+
+static int
+pseudofs_update(char *hostname, char *path, nfs_export *source)
+{
+	nfs_export *exp;
+
+	exp = export_lookup(hostname, path, 0);
+	if (exp && !(exp->m_export.e_flags & NFSEXP_V4ROOT))
+		return 0;
+	if (!exp) {
+		if (v4root_create(path, source) == NULL) {
+			xlog(L_WARNING, "v4root_set: Unable to create "
+					"pseudo export for '%s'", path);
+			return -ENOMEM;
+		}
+		return 0;
+	}
+	/* Update an existing V4ROOT export: */
+	set_pseudofs_security(&exp->m_export);
+	return 0;
+}
+
+static int v4root_add_parents(nfs_export *exp)
+{
+	char *hostname = exp->m_export.e_hostname;
+	char *path;
+	char *ptr;
+	int ret = 0;
+
+	path = strdup(exp->m_export.e_path);
+	if (!path) {
+		xlog(L_WARNING, "v4root_add_parents: Unable to create "
+				"pseudo export for '%s'", exp->m_export.e_path);
+		return -ENOMEM;
+	}
+	for (ptr = path; ptr; ptr = strchr(ptr, '/')) {
+		char saved;
+
+		saved = *ptr;
+		*ptr = '\0';
+		ret = pseudofs_update(hostname, *path ? path : "/", exp);
+		if (ret)
+			break;
+		*ptr = saved;
+		ptr++;
+	}
+	free(path);
+	return ret;
+}
+
+/*
+ * Create pseudo exports by running through the real export
+ * looking at the components of the path that make up the export.
+ * Those path components, if not exported, will become pseudo
+ * exports allowing them to be found when the kernel does an upcall
+ * looking for components of the v4 mount.
+ */
+void
+v4root_set(void)
+{
+	nfs_export	*exp;
+	int	i;
+
+	if (!v4root_needed)
+		return;
+	if (!v4root_support())
+		return;
+
+	for (i = 0; i < MCL_MAXTYPES; i++) {
+		for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+			if (exp->m_export.e_flags & NFSEXP_V4ROOT)
+				/*
+				 * We just added this one, so its
+				 * parents are already dealt with!
+				 */
+				continue;
+
+			if (strcmp(exp->m_export.e_path, "/") == 0 &&
+			    !(exp->m_export.e_flags & NFSEXP_FSID)) {
+				/* Force '/' to be exported as fsid == 0*/
+				exp->m_export.e_flags |= NFSEXP_FSID;
+				exp->m_export.e_fsid = 0;
+			}
+
+			v4root_add_parents(exp);
+			/* XXX: error handling! */
+		}
+	}
+}
diff --git a/support/export/xtab.c b/support/export/xtab.c
new file mode 100644
index 0000000..e210ca9
--- /dev/null
+++ b/support/export/xtab.c
@@ -0,0 +1,256 @@
+/*
+ * support/export/xtab.c
+ *
+ * Interface to the etab/exports file.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <libgen.h>
+
+#include "nfslib.h"
+#include "exportfs.h"
+#include "xio.h"
+#include "xlog.h"
+#include "v4root.h"
+#include "misc.h"
+
+static char state_base_dirname[PATH_MAX] = NFS_STATEDIR;
+struct state_paths etab;
+
+int v4root_needed;
+static void cond_rename(char *newfile, char *oldfile);
+
+static int
+xtab_read(char *xtab, char *lockfn, int is_export)
+{
+    /* is_export == 0  => reading /proc/fs/nfs/exports - we know these things are exported to kernel
+     * is_export == 1  => reading /var/lib/nfs/etab - these things are allowed to be exported
+     */
+	struct exportent	*xp;
+	nfs_export		*exp;
+	int			lockid;
+
+	if ((lockid = xflock(lockfn, "r")) < 0)
+		return 0;
+	setexportent(xtab, "r");
+	if (is_export == 1)
+		v4root_needed = 1;
+	while ((xp = getexportent(is_export==0, 0)) != NULL) {
+		if (!(exp = export_lookup(xp->e_hostname, xp->e_path, is_export != 1)) &&
+		    !(exp = export_create(xp, is_export!=1))) {
+                        if(xp->e_hostname) {
+                            free(xp->e_hostname);
+                            xp->e_hostname=NULL;
+                        }
+                        if(xp->e_uuid) {
+                            free(xp->e_uuid);
+                            xp->e_uuid=NULL;
+                        }
+			continue;
+		}
+		switch (is_export) {
+		case 0:
+			exp->m_exported = 1;
+			break;
+		case 1:
+			exp->m_xtabent = 1;
+			exp->m_mayexport = 1;
+			if ((xp->e_flags & NFSEXP_FSID) && xp->e_fsid == 0)
+				v4root_needed = 0;
+			break;
+		}  
+                if(xp->e_hostname) {
+                    free(xp->e_hostname);
+                    xp->e_hostname=NULL;
+                }
+                if(xp->e_uuid) {
+                    free(xp->e_uuid);
+                    xp->e_uuid=NULL;
+                }
+
+	}
+	endexportent();
+	xfunlock(lockid);
+
+	return 0;
+}
+
+int
+xtab_export_read(void)
+{
+	return xtab_read(etab.statefn, etab.lockfn, 1);
+}
+
+/*
+ * mountd now keeps an open fd for the etab at all times to make sure that the
+ * inode number changes when the xtab_export_write is done. If you change the
+ * routine below such that the files are edited in place, then you'll need to
+ * fix the auth_reload logic as well...
+ */
+static int
+xtab_write(char *xtab, char *xtabtmp, char *lockfn, int is_export)
+{
+	struct exportent	xe;
+	nfs_export		*exp;
+	int			lockid, i;
+
+	if ((lockid = xflock(lockfn, "w")) < 0) {
+		xlog(L_ERROR, "can't lock %s for writing", xtab);
+		return 0;
+	}
+	setexportent(xtabtmp, "w");
+
+	for (i = 0; i < MCL_MAXTYPES; i++) {
+		for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
+			if (is_export && !exp->m_xtabent)
+				continue;
+			if (!is_export && ! exp->m_exported)
+				continue;
+
+			/* write out the export entry using the FQDN */
+			xe = exp->m_export;
+			xe.e_hostname = exp->m_client->m_hostname;
+			putexportent(&xe);
+		}
+	}
+	endexportent();
+
+	cond_rename(xtabtmp, xtab);
+
+	xfunlock(lockid);
+
+	return 1;
+}
+
+int
+xtab_export_write(void)
+{
+	return xtab_write(etab.statefn, etab.tmpfn, etab.lockfn, 1);
+}
+
+/*
+ * rename newfile onto oldfile unless
+ * they are identical
+ */
+static void cond_rename(char *newfile, char *oldfile)
+{
+	int nfd, ofd;
+	char nbuf[4096], obuf[4096];
+	int ncnt, ocnt;
+
+	nfd = open(newfile, 0);
+	if (nfd < 0)
+		return;
+	ofd = open(oldfile, 0);
+	if (ofd < 0) {
+		close(nfd);
+		rename(newfile, oldfile);
+		return;
+	}
+
+	do {
+		ncnt = read(nfd, nbuf, sizeof(nbuf));
+		if (ncnt < 0)
+			break;
+		ocnt = read(ofd, obuf, sizeof(obuf));
+		if (ocnt < 0)
+			break;
+		if (ncnt != ocnt)
+			break;
+		if (ncnt == 0) {
+			close(nfd);
+			close(ofd);
+			unlink(newfile);
+			return;
+		}
+	} while (memcmp(obuf, nbuf, ncnt) == 0);
+
+	/* some mis-match */
+	close(nfd);
+	close(ofd);
+	rename(newfile, oldfile);
+	return;
+}
+
+/*
+ * Returns a dynamically allocated, '\0'-terminated buffer
+ * containing an appropriate pathname, or NULL if an error
+ * occurs.  Caller must free the returned result with free(3).
+ */
+static char *
+state_make_pathname(const char *tabname)
+{
+	return generic_make_pathname(state_base_dirname, tabname);
+}
+
+/**
+ * state_setup_basedir - set up basedir
+ * @progname: C string containing name of program, for error messages
+ * @parentdir: C string containing pathname to on-disk state, or NULL
+ *
+ * This runs before logging is set up, so error messages are directed
+ * to stderr.
+ *
+ * Returns true and sets up our basedir, if @parentdir was valid
+ * and usable; otherwise false is returned.
+ */
+_Bool
+state_setup_basedir(const char *progname, const char *parentdir)
+{
+	return generic_setup_basedir(progname, parentdir, state_base_dirname,
+				     PATH_MAX);
+}
+
+int
+setup_state_path_names(const char *progname, const char *statefn,
+		      const char *tmpfn, const char *lockfn,
+		      struct state_paths *paths)
+{
+	paths->statefn = state_make_pathname(statefn);
+	if (!paths->statefn) {
+		fprintf(stderr, "%s: state_make_pathname(%s) failed\n",
+			progname, statefn);
+		goto out_err;
+	}
+	paths->tmpfn = state_make_pathname(tmpfn);
+	if (!paths->tmpfn) {
+		fprintf(stderr, "%s: state_make_pathname(%s) failed\n",
+			progname, tmpfn);
+		goto out_free_statefn;
+	}
+	paths->lockfn = state_make_pathname(lockfn);
+	if (!paths->lockfn) {
+		fprintf(stderr, "%s: state_make_pathname(%s) failed\n",
+			progname, lockfn);
+		goto out_free_tmpfn;
+	}
+	return 1;
+
+out_free_tmpfn:
+	free(paths->tmpfn);
+out_free_statefn:
+	free(paths->statefn);
+out_err:
+	return 0;
+
+}
+
+void
+free_state_path_names(struct state_paths *paths)
+{
+	free(paths->statefn);
+	free(paths->tmpfn);
+	free(paths->lockfn);
+}