New upstream version 2.5~rc2upstream/2.5_rc2

18 files changed, 1958 insertions, 92 deletions

diff --git a/sample/sample-plugins/Makefile b/sample/sample-plugins/Makefile
new file mode 100644
index 0000000..9967d2f
--- /dev/null
+++ b/sample/sample-plugins/Makefile
@@ -0,0 +1,584 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# sample/sample-plugins/Makefile.  Generated from Makefile.in by configure.
+
+# Copyright (C) 1994-2018 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.
+
+
+
+#
+#  OpenVPN -- An application to securely tunnel IP networks
+#             over a single UDP port, with support for SSL/TLS-based
+#             session authentication and key exchange,
+#             packet encryption, packet authentication, and
+#             packet compression.
+#
+#  Copyright (C) 2002-2020 OpenVPN Inc <sales@openvpn.net>
+#
+
+#  SPDX-License-Identifier: GPL-2.0-only
+#
+#  Copyright (C) 2020 OpenVPN Inc <sales@openvpn.net>
+#
+
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
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+    true; \
+  else \
+    false; \
+  fi; \
+}
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+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
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+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
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+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
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+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
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+        -*O) strip_trailopt 'O'; skip_next=yes;; \
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+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
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+pkgincludedir = $(includedir)/openvpn
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+pkglibexecdir = $(libexecdir)/openvpn
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = x86_64-pc-linux-gnu
+host_triplet = x86_64-pc-linux-gnu
+subdir = sample/sample-plugins
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+am__aclocal_m4_deps = $(top_srcdir)/m4/ax_emptyarray.m4 \
+	$(top_srcdir)/m4/ax_socklen_t.m4 \
+	$(top_srcdir)/m4/ax_varargs.m4 $(top_srcdir)/m4/libtool.m4 \
+	$(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \
+	$(top_srcdir)/m4/ltversion.m4 $(top_srcdir)/m4/lt~obsolete.m4 \
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+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/config.h \
+	$(top_builddir)/include/openvpn-plugin.h
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+am__DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.plugins \
+	README
+DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
+ACLOCAL = ${SHELL} /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn/missing aclocal-1.16
+AMTAR = $${TAR-tar}
+AM_DEFAULT_VERBOSITY = 1
+AR = ar
+AS = as
+AUTOCONF = ${SHELL} /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn/missing autoconf
+AUTOHEADER = ${SHELL} /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn/missing autoheader
+AUTOMAKE = ${SHELL} /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn/missing automake-1.16
+AWK = gawk
+CC = gcc
+CCDEPMODE = depmode=gcc3
+CFLAGS = -Wall -Wno-unused-parameter -Wno-unused-function -Wno-stringop-truncation -g -O2 -std=c99
+CMOCKA_CFLAGS = 
+CMOCKA_LIBS = 
+CPP = gcc -E
+CPPFLAGS = 
+CYGPATH_W = echo
+DEFS = -DHAVE_CONFIG_H
+DEPDIR = .deps
+DLLTOOL = false
+DL_LIBS = -ldl
+DSYMUTIL = 
+DUMPBIN = 
+ECHO_C = 
+ECHO_N = -n
+ECHO_T = 
+EGREP = /usr/bin/grep -E
+ENABLE_UNITTESTS = 
+EXEEXT = 
+FGREP = /usr/bin/grep -F
+GIT = git
+GREP = /usr/bin/grep
+IFCONFIG = /usr/sbin/ifconfig
+INSTALL = /usr/bin/install -c
+INSTALL_DATA = ${INSTALL} -m 644
+INSTALL_PROGRAM = ${INSTALL}
+INSTALL_SCRIPT = ${INSTALL}
+INSTALL_STRIP_PROGRAM = $(install_sh) -c -s
+IPROUTE = /usr/sbin/ip
+LD = /usr/bin/ld -m elf_x86_64
+LDFLAGS = 
+LIBOBJS = 
+LIBPAM_CFLAGS = 
+LIBPAM_LIBS = -lpam
+LIBS = 
+LIBTOOL = $(SHELL) $(top_builddir)/libtool
+LIPO = 
+LN_S = ln -s
+LTLIBOBJS = 
+LT_SYS_LIBRARY_PATH = 
+LZ4_CFLAGS = 
+LZ4_LIBS = 
+LZO_CFLAGS = 
+LZO_LIBS = -llzo2
+MAKEINFO = ${SHELL} /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn/missing makeinfo
+MANIFEST_TOOL = :
+MBEDTLS_CFLAGS = 
+MBEDTLS_LIBS = 
+MKDIR_P = /usr/bin/mkdir -p
+NETSTAT = netstat
+NM = /usr/bin/nm -B
+NMEDIT = 
+OBJDUMP = objdump
+OBJEXT = o
+OPENSSL_CFLAGS = 
+OPENSSL_LIBS = -lssl -lcrypto 
+OPENVPN_VERSION_MAJOR = 2
+OPENVPN_VERSION_MINOR = 5
+OPENVPN_VERSION_PATCH = _rc2
+OPTIONAL_CRYPTO_CFLAGS =  
+OPTIONAL_CRYPTO_LIBS =  -lssl -lcrypto 
+OPTIONAL_DL_LIBS = -ldl
+OPTIONAL_INOTIFY_CFLAGS = 
+OPTIONAL_INOTIFY_LIBS = 
+OPTIONAL_LZ4_CFLAGS = 
+OPTIONAL_LZ4_LIBS = 
+OPTIONAL_LZO_CFLAGS = 
+OPTIONAL_LZO_LIBS = -llzo2
+OPTIONAL_PKCS11_HELPER_CFLAGS = 
+OPTIONAL_PKCS11_HELPER_LIBS = 
+OPTIONAL_SELINUX_LIBS = 
+OPTIONAL_SYSTEMD_LIBS = 
+OTOOL = 
+OTOOL64 = 
+P11KIT_CFLAGS = 
+P11KIT_LIBS = 
+PACKAGE = openvpn
+PACKAGE_BUGREPORT = openvpn-users@lists.sourceforge.net
+PACKAGE_NAME = OpenVPN
+PACKAGE_STRING = OpenVPN 2.5_rc2
+PACKAGE_TARNAME = openvpn
+PACKAGE_URL = 
+PACKAGE_VERSION = 2.5_rc2
+PATH_SEPARATOR = :
+PKCS11_HELPER_CFLAGS = 
+PKCS11_HELPER_LIBS = -lpthread -ldl -lcrypto -lpkcs11-helper 
+PKG_CONFIG = /usr/bin/pkg-config
+PKG_CONFIG_LIBDIR = 
+PKG_CONFIG_PATH = 
+PLUGINDIR = 
+PLUGIN_AUTH_PAM_CFLAGS = 
+PLUGIN_AUTH_PAM_LIBS = -lpam
+RANLIB = ranlib
+RC = 
+ROUTE = /usr/sbin/route
+RST2HTML = rst2html
+RST2MAN = rst2man
+SED = /usr/bin/sed
+SELINUX_LIBS = -lselinux
+SET_MAKE = 
+SHELL = /bin/sh
+SOCKETS_LIBS =  -lresolv
+STRIP = strip
+SYSTEMD_ASK_PASSWORD = /usr/bin/systemd-ask-password
+SYSTEMD_UNIT_DIR = 
+TAP_CFLAGS = 
+TAP_WIN_COMPONENT_ID = tap0901
+TAP_WIN_MIN_MAJOR = 9
+TAP_WIN_MIN_MINOR = 9
+TEST_CFLAGS =     -I$(top_srcdir)/include 
+TEST_LDFLAGS =  -lssl -lcrypto   -llzo2 
+TMPFILES_DIR = 
+VERSION = 2.5_rc2
+abs_builddir = /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn/sample/sample-plugins
+abs_srcdir = /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn/sample/sample-plugins
+abs_top_builddir = /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn
+abs_top_srcdir = /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn
+ac_ct_AR = ar
+ac_ct_CC = gcc
+ac_ct_DUMPBIN = 
+am__include = include
+am__leading_dot = .
+am__quote = 
+am__tar = $${TAR-tar} chof - "$$tardir"
+am__untar = $${TAR-tar} xf -
+bindir = ${exec_prefix}/bin
+build = x86_64-pc-linux-gnu
+build_alias = 
+build_cpu = x86_64
+build_os = linux-gnu
+build_vendor = pc
+builddir = .
+datadir = ${datarootdir}
+datarootdir = ${prefix}/share
+docdir = ${datarootdir}/doc/${PACKAGE_TARNAME}
+dvidir = ${docdir}
+exec_prefix = ${prefix}
+host = x86_64-pc-linux-gnu
+host_alias = 
+host_cpu = x86_64
+host_os = linux-gnu
+host_vendor = pc
+htmldir = ${docdir}
+includedir = ${prefix}/include
+infodir = ${datarootdir}/info
+install_sh = ${SHELL} /home/samuli/opt/openvpninc/openvpn-release-scripts/release/openvpn/install-sh
+libdir = ${exec_prefix}/lib
+libexecdir = ${exec_prefix}/libexec
+libsystemd_CFLAGS = 
+libsystemd_LIBS = 
+localedir = ${datarootdir}/locale
+localstatedir = ${prefix}/var
+mandir = ${datarootdir}/man
+mkdir_p = $(MKDIR_P)
+oldincludedir = /usr/include
+pdfdir = ${docdir}
+plugindir = ${libdir}/openvpn/plugins
+prefix = /usr/local
+program_transform_name = s,x,x,
+psdir = ${docdir}
+sampledir = $(docdir)/sample
+sbindir = ${exec_prefix}/sbin
+sharedstatedir = ${prefix}/com
+srcdir = .
+sysconfdir = ${prefix}/etc
+systemdunitdir = 
+target_alias = 
+tmpfilesdir = 
+top_build_prefix = ../../
+top_builddir = ../..
+top_srcdir = ../..
+MAINTAINERCLEANFILES = \
+	$(srcdir)/Makefile.in
+
+AM_CPPFLAGS = -I$(top_srcdir) -I$(top_builddir) \
+	-I$(top_srcdir)/include -I$(top_builddir)/include
+
+
+#
+# Plug-ins to build - listed entries should not carry any extensions
+#
+PLUGINS = \
+	defer/simple \
+	keying-material-exporter-demo/keyingmaterialexporter \
+	log/log log/log_v3 \
+	simple/base64 \
+	simple/simple \
+	client-connect/sample-client-connect
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .o
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am $(srcdir)/Makefile.plugins $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign sample/sample-plugins/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign sample/sample-plugins/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+$(srcdir)/Makefile.plugins $(am__empty):
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+tags TAGS:
+
+ctags CTAGS:
+
+cscope cscopelist:
+
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	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="$(distdir)" \
+	  dist-hook
+check-am: all-am
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(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:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
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+uninstall-am:
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+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	cscopelist-am ctags-am dist-hook distclean distclean-generic \
+	distclean-libtool 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-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# All the plugins to build - rewritten with .so extension
+all : $(foreach var, $(PLUGINS), $(var).so)
+
+# Do not automatically remove object files
+# This is a special Make setting, to avoid adding an implicit
+# 'rm' command on object files - due to the .c.o/%.so rules below
+.PRECIOUS: %.o
+
+# Compile step
+.c.o :
+	test -d `dirname $@` || $(MKDIR_P) `dirname $@`; \
+	$(CC) -c -o $@ $(CFLAGS) $(AM_CPPFLAGS) -fPIC $<
+
+# Link step
+%.so : %.o
+	$(CC) $(LDFLAGS) -shared -fPIC -o $@ $<
+
+# Clean up all build object and shared object files
+clean :
+	rm -f $(foreach var, $(PLUGINS), $(var).o) \
+	$(foreach var, $(PLUGINS), $(var).so)
+
+# We don't want automake to pull in libtool for building these
+# sample-plugins.  Even though this breaks the conceptual ideas
+# around autoconf/automake/libtools ... these sample plug-ins
+# are just sample code, not to be installed or distributed outside
+# of the source tarball.  Not even built by default, by design.
+#
+# We only add this as a simple and convenient way to build all
+# these plug-ins with the same build parameters as the rest
+# of the OpenVPN code.
+#
+# All the plugins which will be built are processed in this
+# separate Makefile, which disconnects everything just enough
+# to achieve our goal.
+
+dist-hook :
+	make -f Makefile.plugins clean
+
+# 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/sample/sample-plugins/Makefile.am b/sample/sample-plugins/Makefile.am
new file mode 100644
index 0000000..b903a6f
--- /dev/null
+++ b/sample/sample-plugins/Makefile.am
@@ -0,0 +1,34 @@
+#
+#  OpenVPN -- An application to securely tunnel IP networks
+#             over a single UDP port, with support for SSL/TLS-based
+#             session authentication and key exchange,
+#             packet encryption, packet authentication, and
+#             packet compression.
+#
+#  Copyright (C) 2002-2020 OpenVPN Inc <sales@openvpn.net>
+#
+
+MAINTAINERCLEANFILES = \
+	$(srcdir)/Makefile.in
+
+AM_CPPFLAGS = -I$(top_srcdir) -I$(top_builddir) \
+	-I$(top_srcdir)/include -I$(top_builddir)/include
+
+# We don't want automake to pull in libtool for building these
+# sample-plugins.  Even though this breaks the conceptual ideas
+# around autoconf/automake/libtools ... these sample plug-ins
+# are just sample code, not to be installed or distributed outside
+# of the source tarball.  Not even built by default, by design.
+#
+# We only add this as a simple and convenient way to build all
+# these plug-ins with the same build parameters as the rest
+# of the OpenVPN code.
+#
+# All the plugins which will be built are processed in this
+# separate Makefile, which disconnects everything just enough
+# to achieve our goal.
+include Makefile.plugins
+
+
+dist-hook :
+	make -f Makefile.plugins clean
diff --git a/sample/sample-plugins/Makefile.in b/sample/sample-plugins/Makefile.in
new file mode 100644
index 0000000..ae3eef3
--- /dev/null
+++ b/sample/sample-plugins/Makefile.in
@@ -0,0 +1,584 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2018 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@
+
+#
+#  OpenVPN -- An application to securely tunnel IP networks
+#             over a single UDP port, with support for SSL/TLS-based
+#             session authentication and key exchange,
+#             packet encryption, packet authentication, and
+#             packet compression.
+#
+#  Copyright (C) 2002-2020 OpenVPN Inc <sales@openvpn.net>
+#
+
+#  SPDX-License-Identifier: GPL-2.0-only
+#
+#  Copyright (C) 2020 OpenVPN Inc <sales@openvpn.net>
+#
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
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+    true; \
+  else \
+    false; \
+  fi; \
+}
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+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
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+  esac; \
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+  if $(am__is_gnu_make); then \
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+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
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+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
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+  test $$has_opt = yes
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+	$(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \
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+mkinstalldirs = $(install_sh) -d
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+	$(top_builddir)/include/openvpn-plugin.h
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+am__DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.plugins \
+	README
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+CC = @CC@
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+CFLAGS = @CFLAGS@
+CMOCKA_CFLAGS = @CMOCKA_CFLAGS@
+CMOCKA_LIBS = @CMOCKA_LIBS@
+CPP = @CPP@
+CPPFLAGS = @CPPFLAGS@
+CYGPATH_W = @CYGPATH_W@
+DEFS = @DEFS@
+DEPDIR = @DEPDIR@
+DLLTOOL = @DLLTOOL@
+DL_LIBS = @DL_LIBS@
+DSYMUTIL = @DSYMUTIL@
+DUMPBIN = @DUMPBIN@
+ECHO_C = @ECHO_C@
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+ENABLE_UNITTESTS = @ENABLE_UNITTESTS@
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+INSTALL_DATA = @INSTALL_DATA@
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+INSTALL_SCRIPT = @INSTALL_SCRIPT@
+INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
+IPROUTE = @IPROUTE@
+LD = @LD@
+LDFLAGS = @LDFLAGS@
+LIBOBJS = @LIBOBJS@
+LIBPAM_CFLAGS = @LIBPAM_CFLAGS@
+LIBPAM_LIBS = @LIBPAM_LIBS@
+LIBS = @LIBS@
+LIBTOOL = @LIBTOOL@
+LIPO = @LIPO@
+LN_S = @LN_S@
+LTLIBOBJS = @LTLIBOBJS@
+LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
+LZ4_CFLAGS = @LZ4_CFLAGS@
+LZ4_LIBS = @LZ4_LIBS@
+LZO_CFLAGS = @LZO_CFLAGS@
+LZO_LIBS = @LZO_LIBS@
+MAKEINFO = @MAKEINFO@
+MANIFEST_TOOL = @MANIFEST_TOOL@
+MBEDTLS_CFLAGS = @MBEDTLS_CFLAGS@
+MBEDTLS_LIBS = @MBEDTLS_LIBS@
+MKDIR_P = @MKDIR_P@
+NETSTAT = @NETSTAT@
+NM = @NM@
+NMEDIT = @NMEDIT@
+OBJDUMP = @OBJDUMP@
+OBJEXT = @OBJEXT@
+OPENSSL_CFLAGS = @OPENSSL_CFLAGS@
+OPENSSL_LIBS = @OPENSSL_LIBS@
+OPENVPN_VERSION_MAJOR = @OPENVPN_VERSION_MAJOR@
+OPENVPN_VERSION_MINOR = @OPENVPN_VERSION_MINOR@
+OPENVPN_VERSION_PATCH = @OPENVPN_VERSION_PATCH@
+OPTIONAL_CRYPTO_CFLAGS = @OPTIONAL_CRYPTO_CFLAGS@
+OPTIONAL_CRYPTO_LIBS = @OPTIONAL_CRYPTO_LIBS@
+OPTIONAL_DL_LIBS = @OPTIONAL_DL_LIBS@
+OPTIONAL_INOTIFY_CFLAGS = @OPTIONAL_INOTIFY_CFLAGS@
+OPTIONAL_INOTIFY_LIBS = @OPTIONAL_INOTIFY_LIBS@
+OPTIONAL_LZ4_CFLAGS = @OPTIONAL_LZ4_CFLAGS@
+OPTIONAL_LZ4_LIBS = @OPTIONAL_LZ4_LIBS@
+OPTIONAL_LZO_CFLAGS = @OPTIONAL_LZO_CFLAGS@
+OPTIONAL_LZO_LIBS = @OPTIONAL_LZO_LIBS@
+OPTIONAL_PKCS11_HELPER_CFLAGS = @OPTIONAL_PKCS11_HELPER_CFLAGS@
+OPTIONAL_PKCS11_HELPER_LIBS = @OPTIONAL_PKCS11_HELPER_LIBS@
+OPTIONAL_SELINUX_LIBS = @OPTIONAL_SELINUX_LIBS@
+OPTIONAL_SYSTEMD_LIBS = @OPTIONAL_SYSTEMD_LIBS@
+OTOOL = @OTOOL@
+OTOOL64 = @OTOOL64@
+P11KIT_CFLAGS = @P11KIT_CFLAGS@
+P11KIT_LIBS = @P11KIT_LIBS@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
+PACKAGE_VERSION = @PACKAGE_VERSION@
+PATH_SEPARATOR = @PATH_SEPARATOR@
+PKCS11_HELPER_CFLAGS = @PKCS11_HELPER_CFLAGS@
+PKCS11_HELPER_LIBS = @PKCS11_HELPER_LIBS@
+PKG_CONFIG = @PKG_CONFIG@
+PKG_CONFIG_LIBDIR = @PKG_CONFIG_LIBDIR@
+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+PLUGINDIR = @PLUGINDIR@
+PLUGIN_AUTH_PAM_CFLAGS = @PLUGIN_AUTH_PAM_CFLAGS@
+PLUGIN_AUTH_PAM_LIBS = @PLUGIN_AUTH_PAM_LIBS@
+RANLIB = @RANLIB@
+RC = @RC@
+ROUTE = @ROUTE@
+RST2HTML = @RST2HTML@
+RST2MAN = @RST2MAN@
+SED = @SED@
+SELINUX_LIBS = @SELINUX_LIBS@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+SOCKETS_LIBS = @SOCKETS_LIBS@
+STRIP = @STRIP@
+SYSTEMD_ASK_PASSWORD = @SYSTEMD_ASK_PASSWORD@
+SYSTEMD_UNIT_DIR = @SYSTEMD_UNIT_DIR@
+TAP_CFLAGS = @TAP_CFLAGS@
+TAP_WIN_COMPONENT_ID = @TAP_WIN_COMPONENT_ID@
+TAP_WIN_MIN_MAJOR = @TAP_WIN_MIN_MAJOR@
+TAP_WIN_MIN_MINOR = @TAP_WIN_MIN_MINOR@
+TEST_CFLAGS = @TEST_CFLAGS@
+TEST_LDFLAGS = @TEST_LDFLAGS@
+TMPFILES_DIR = @TMPFILES_DIR@
+VERSION = @VERSION@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
+abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
+ac_ct_CC = @ac_ct_CC@
+ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
+am__include = @am__include@
+am__leading_dot = @am__leading_dot@
+am__quote = @am__quote@
+am__tar = @am__tar@
+am__untar = @am__untar@
+bindir = @bindir@
+build = @build@
+build_alias = @build_alias@
+build_cpu = @build_cpu@
+build_os = @build_os@
+build_vendor = @build_vendor@
+builddir = @builddir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+docdir = @docdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libdir = @libdir@
+libexecdir = @libexecdir@
+libsystemd_CFLAGS = @libsystemd_CFLAGS@
+libsystemd_LIBS = @libsystemd_LIBS@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+plugindir = @plugindir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+sampledir = @sampledir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+systemdunitdir = @systemdunitdir@
+target_alias = @target_alias@
+tmpfilesdir = @tmpfilesdir@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+MAINTAINERCLEANFILES = \
+	$(srcdir)/Makefile.in
+
+AM_CPPFLAGS = -I$(top_srcdir) -I$(top_builddir) \
+	-I$(top_srcdir)/include -I$(top_builddir)/include
+
+
+#
+# Plug-ins to build - listed entries should not carry any extensions
+#
+PLUGINS = \
+	defer/simple \
+	keying-material-exporter-demo/keyingmaterialexporter \
+	log/log log/log_v3 \
+	simple/base64 \
+	simple/simple \
+	client-connect/sample-client-connect
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .o
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am $(srcdir)/Makefile.plugins $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign sample/sample-plugins/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign sample/sample-plugins/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+$(srcdir)/Makefile.plugins $(am__empty):
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+tags TAGS:
+
+ctags CTAGS:
+
+cscope cscopelist:
+
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	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="$(distdir)" \
+	  dist-hook
+check-am: all-am
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(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:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	cscopelist-am ctags-am dist-hook distclean distclean-generic \
+	distclean-libtool 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-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# All the plugins to build - rewritten with .so extension
+all : $(foreach var, $(PLUGINS), $(var).so)
+
+# Do not automatically remove object files
+# This is a special Make setting, to avoid adding an implicit
+# 'rm' command on object files - due to the .c.o/%.so rules below
+.PRECIOUS: %.o
+
+# Compile step
+.c.o :
+	test -d `dirname $@` || $(MKDIR_P) `dirname $@`; \
+	$(CC) -c -o $@ $(CFLAGS) $(AM_CPPFLAGS) -fPIC $<
+
+# Link step
+%.so : %.o
+	$(CC) $(LDFLAGS) -shared -fPIC -o $@ $<
+
+# Clean up all build object and shared object files
+clean :
+	rm -f $(foreach var, $(PLUGINS), $(var).o) \
+	$(foreach var, $(PLUGINS), $(var).so)
+
+# We don't want automake to pull in libtool for building these
+# sample-plugins.  Even though this breaks the conceptual ideas
+# around autoconf/automake/libtools ... these sample plug-ins
+# are just sample code, not to be installed or distributed outside
+# of the source tarball.  Not even built by default, by design.
+#
+# We only add this as a simple and convenient way to build all
+# these plug-ins with the same build parameters as the rest
+# of the OpenVPN code.
+#
+# All the plugins which will be built are processed in this
+# separate Makefile, which disconnects everything just enough
+# to achieve our goal.
+
+dist-hook :
+	make -f Makefile.plugins clean
+
+# 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/sample/sample-plugins/Makefile.plugins b/sample/sample-plugins/Makefile.plugins
new file mode 100644
index 0000000..37559a8
--- /dev/null
+++ b/sample/sample-plugins/Makefile.plugins
@@ -0,0 +1,37 @@
+#  SPDX-License-Identifier: GPL-2.0-only
+#
+#  Copyright (C) 2020 OpenVPN Inc <sales@openvpn.net>
+#
+
+#
+# Plug-ins to build - listed entries should not carry any extensions
+#
+PLUGINS = \
+	defer/simple \
+	keying-material-exporter-demo/keyingmaterialexporter \
+	log/log log/log_v3 \
+	simple/base64 \
+	simple/simple \
+	client-connect/sample-client-connect
+
+# All the plugins to build - rewritten with .so extension
+all : $(foreach var, $(PLUGINS), $(var).so)
+
+# Do not automatically remove object files
+# This is a special Make setting, to avoid adding an implicit
+# 'rm' command on object files - due to the .c.o/%.so rules below
+.PRECIOUS: %.o
+
+# Compile step
+.c.o :
+	test -d `dirname $@` || $(MKDIR_P) `dirname $@`; \
+	$(CC) -c -o $@ $(CFLAGS) $(AM_CPPFLAGS) -fPIC $<
+
+# Link step
+%.so : %.o
+	$(CC) $(LDFLAGS) -shared -fPIC -o $@ $<
+
+# Clean up all build object and shared object files
+clean :
+	rm -f $(foreach var, $(PLUGINS), $(var).o) \
+	$(foreach var, $(PLUGINS), $(var).so)
diff --git a/sample/sample-plugins/README b/sample/sample-plugins/README
new file mode 100644
index 0000000..cf1b355
--- /dev/null
+++ b/sample/sample-plugins/README
@@ -0,0 +1,43 @@
+OpenVPN plug-in examples.
+
+Examples provided:
+
+* authentication and logging
+simple/simple.c -- using the --auth-user-pass-verify callback, verify
+                   that the username/password is "foo"/"bar".
+defer/simple.c  -- using the --auth-user-pass-verify callback,
+                   test deferred authentication.
+log/log.c       -- Extended variant of simple/simple.c which adds more
+                   logging of what is happening inside the plug-in
+log/log_v3.c    -- A variant of log/log.c, which makes use of the
+                   OpenVPN plug-in v3 API.  This will also log even more
+                   information related to certificates in use.
+
+* client-connect (and logging)
+client-connect/sample-client-connect -- demonstrate how to use the
+                   CLIENT_CONNECT and CLIENT_CONNECT_V2 hooks to achieve
+                   "per client configuration / logging / ..." actions,
+                   both in synchronous and async/deferred mode
+
+* cryptography related
+simple/base64.c -- Example using the OpenVPN exported base64 encode/decode
+                   functions
+keying-material-exporter-demo/keyingmaterialexporter.c
+                -- Example based on TLS Keying Material Exporters over HTTP [RFC-5705]
+                   (openvpn/doc/keying-material-exporter.txt).  For more details, see
+                   keying-material-exporter-demo/README
+
+
+To build on *BSD/Linux platforms (requires GNU Make):
+
+   gmake                   (builds a default set of plug-ins)
+   gmake simple/simple.so
+
+To build on Windows platform (MinGW):
+
+   cd simple; ./winbuild simple.so
+
+To use in OpenVPN, add to config file:
+
+  plugin simple.so (Linux/BSD/etc.)
+  plugin simple.dll
diff --git a/sample/sample-plugins/client-connect/README b/sample/sample-plugins/client-connect/README
new file mode 100644
index 0000000..cb3e0f3
--- /dev/null
+++ b/sample/sample-plugins/client-connect/README
@@ -0,0 +1,38 @@
+OpenVPN plugin examples.
+
+Examples provided:
+
+sample-client-connect.c
+
+  - hook to all plugin hooks that openvpn offers
+  - log which hook got called
+  - on CLIENT_CONNECT or CLIENT_CONNECT_V2 set some config variables
+    (controlled by "setenv plugin_cc_config ..." and "plugin_cc2_config"
+    in openvpn's config)
+
+  - if the environment variable UV_WANT_CC_FAIL is set, fail
+  - if the environment variable UV_WANT_CC_DISABLE is set, reject ("disable")
+  - if the environment variable UV_WANT_CC_ASYNC is set, go to
+    asynchronous/deferred mode on CLIENT_CONNECT, and sleep for
+    ${UV_WANT_CC_ASYNC} seconds
+
+  - if the environment variable UV_WANT_CC2_FAIL is set, fail CC2
+  - if the environment variable UV_WANT_CC2_DISABLE is set, reject ("disable")
+  - if the environment variable UV_WANT_CC2_ASYNC is set, go to
+    asynchronous/deferred mode on CLIENT_CONNECT_V2, and sleep for
+    ${UV_WANT_CC2_ASYNC} seconds
+
+    (this can be client-controlled with --setenv UV_WANT_CC_ASYNC nnn
+     etc. --> for easy testing server code paths)
+
+To build for unixy platforms (not very sophisticated right now, needs gmake):
+
+  .../sample-plugins$ gmake client-connect/sample-client-connect.so
+
+(This plugin has not been tested on Windows, and might not even work due
+to its use of fork() and wait().  Let us know if it does or needs patches)
+
+
+To use in OpenVPN, add to config file:
+
+  plugin sample-client-connect.so (Linux/BSD/etc.)
diff --git a/sample/sample-plugins/client-connect/sample-client-connect.c b/sample/sample-plugins/client-connect/sample-client-connect.c
new file mode 100644
index 0000000..6168076
--- /dev/null
+++ b/sample/sample-plugins/client-connect/sample-client-connect.c
@@ -0,0 +1,612 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * This file implements a simple OpenVPN plugin module which
+ * will log the calls made, and send back some config statements
+ * when called on the CLIENT_CONNECT and CLIENT_CONNECT_V2 hooks.
+ *
+ * it can be asked to fail or go to async/deferred mode by setting
+ * environment variables (UV_WANT_CC_FAIL, UV_WANT_CC_ASYNC,
+ * UV_WANT_CC2_ASYNC) - mostly used as a testing vehicle for the
+ * server side code to handle these cases
+ *
+ * See the README file for build instructions and env control variables.
+ */
+
+/* strdup() might need special defines to be visible in <string.h> */
+#include "config.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+
+#include "openvpn-plugin.h"
+
+/* Pointers to functions exported from openvpn */
+static plugin_log_t plugin_log = NULL;
+static plugin_secure_memzero_t plugin_secure_memzero = NULL;
+static plugin_base64_decode_t plugin_base64_decode = NULL;
+
+/* module name for plugin_log() */
+static char *MODULE = "sample-cc";
+
+/*
+ * Our context, where we keep our state.
+ */
+
+struct plugin_context {
+    int verb;                           /* logging verbosity */
+};
+
+/* this is used for the CLIENT_CONNECT_V2 async/deferred handler
+ *
+ * the "CLIENT_CONNECT_V2" handler puts per-client information into
+ * this, and the "CLIENT_CONNECT_DEFER_V2" handler looks at it to see
+ * if it's time yet to succeed/fail
+ */
+struct plugin_per_client_context {
+    time_t sleep_until;                 /* wakeup time (time() + sleep) */
+    bool want_fail;
+    bool want_disable;
+    const char *client_config;
+};
+
+/*
+ * Given an environmental variable name, search
+ * the envp array for its value, returning it
+ * if found or NULL otherwise.
+ */
+static const char *
+get_env(const char *name, const char *envp[])
+{
+    if (envp)
+    {
+        int i;
+        const int namelen = strlen(name);
+        for (i = 0; envp[i]; ++i)
+        {
+            if (!strncmp(envp[i], name, namelen))
+            {
+                const char *cp = envp[i] + namelen;
+                if (*cp == '=')
+                {
+                    return cp + 1;
+                }
+            }
+        }
+    }
+    return NULL;
+}
+
+
+static int
+atoi_null0(const char *str)
+{
+    if (str)
+    {
+        return atoi(str);
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+/* use v3 functions so we can use openvpn's logging and base64 etc. */
+OPENVPN_EXPORT int
+openvpn_plugin_open_v3(const int v3structver,
+                       struct openvpn_plugin_args_open_in const *args,
+                       struct openvpn_plugin_args_open_return *ret)
+{
+    /* const char **argv = args->argv; */ /* command line arguments (unused) */
+    const char **envp = args->envp;       /* environment variables */
+
+    /* Check API compatibility -- struct version 5 or higher needed */
+    if (v3structver < 5)
+    {
+        fprintf(stderr, "sample-client-connect: this plugin is incompatible with the running version of OpenVPN\n");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    /*
+     * Allocate our context
+     */
+    struct plugin_context *context = calloc(1, sizeof(struct plugin_context));
+    if (!context)
+    {
+        goto error;
+    }
+
+    /*
+     * Intercept just about everything...
+     */
+    ret->type_mask =
+        OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_UP)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_DOWN)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_ROUTE_UP)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_IPCHANGE)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_TLS_VERIFY)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_CLIENT_CONNECT)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_CLIENT_CONNECT_V2)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_CLIENT_CONNECT_DEFER_V2)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_CLIENT_DISCONNECT)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_LEARN_ADDRESS)
+        |OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_TLS_FINAL);
+
+    /* Save global pointers to functions exported from openvpn */
+    plugin_log = args->callbacks->plugin_log;
+    plugin_secure_memzero = args->callbacks->plugin_secure_memzero;
+    plugin_base64_decode = args->callbacks->plugin_base64_decode;
+
+    /*
+     * Get verbosity level from environment
+     */
+    context->verb = atoi_null0(get_env("verb", envp));
+
+    ret->handle = (openvpn_plugin_handle_t *) context;
+    plugin_log(PLOG_NOTE, MODULE, "initialization succeeded");
+    return OPENVPN_PLUGIN_FUNC_SUCCESS;
+
+error:
+    if (context)
+    {
+        free(context);
+    }
+    return OPENVPN_PLUGIN_FUNC_ERROR;
+}
+
+
+/* there are two possible interfaces for an openvpn plugin how
+ * to be called on "client connect", which primarily differ in the
+ * way config options are handed back to the client instance
+ * (see openvpn/multi.c, multi_client_connect_call_plugin_{v1,v2}())
+ *
+ * OPENVPN_PLUGIN_CLIENT_CONNECT
+ *   openvpn creates a temp file and passes the name to the plugin
+ *    (via argv[1] variable, argv[0] is the name of the plugin)
+ *   the plugin can write config statements to that file, and openvpn
+ *    reads it in like a "ccd/$cn" per-client config file
+ *
+ * OPENVPN_PLUGIN_CLIENT_CONNECT_V2
+ *   the caller passes in a pointer to an "openvpn_plugin_string_list"
+ *   (openvpn-plugin.h), which is a linked list of (name,value) pairs
+ *
+ *   we fill in one node with name="config" and value="our config"
+ *
+ *   both "l" and "l->name" and "l->value" are malloc()ed by the plugin
+ *   and free()ed by the caller (openvpn_plugin_string_list_free())
+ */
+
+/* helper function to write actual "here are your options" file,
+ * called from sync and sync handler
+ */
+int
+write_cc_options_file(const char *name, const char **envp)
+{
+    if (!name)
+    {
+        return OPENVPN_PLUGIN_FUNC_SUCCESS;
+    }
+
+    FILE *fp = fopen(name,"w");
+    if (!fp)
+    {
+        plugin_log(PLOG_ERR, MODULE, "fopen('%s') failed", name);
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    /* config to-be-sent can come from "setenv plugin_cc_config" in openvpn */
+    const char *p = get_env("plugin_cc_config", envp);
+    if (p)
+    {
+        fprintf(fp, "%s\n", p);
+    }
+
+    /* some generic config snippets so we know it worked */
+    fprintf(fp, "push \"echo sample-cc plugin 1 called\"\n");
+
+    /* if the caller wants, reject client by means of "disable" option */
+    if (get_env("UV_WANT_CC_DISABLE", envp))
+    {
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC_DISABLE, reject");
+        fprintf(fp, "disable\n");
+    }
+    fclose(fp);
+
+    return OPENVPN_PLUGIN_FUNC_SUCCESS;
+}
+
+int
+cc_handle_deferred_v1(int seconds, const char *name, const char **envp)
+{
+    const char *ccd_file = get_env("client_connect_deferred_file", envp);
+    if (!ccd_file)
+    {
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC_ASYNC=%d, but "
+                   "'client_connect_deferred_file' not set -> fail", seconds);
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    /* the CLIENT_CONNECT (v1) API is a bit tricky to work with, because
+     * completition can be signalled both by the "deferred_file" and by
+     * the new ...CLIENT_CONNECT_DEFER API - which is optional.
+     *
+     * For OpenVPN to be able to differenciate, we must create the file
+     * right away if we want to use that for signalling.
+     */
+    int fd = open(ccd_file, O_WRONLY);
+    if (fd < 0)
+    {
+        plugin_log(PLOG_ERR|PLOG_ERRNO, MODULE, "open('%s') failed", ccd_file);
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    if (write(fd, "2", 1) != 1)
+    {
+        plugin_log(PLOG_ERR|PLOG_ERRNO, MODULE, "write to '%s' failed", ccd_file );
+        close(fd);
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+    close(fd);
+
+    /* we do not want to complicate our lives with having to wait()
+     * for child processes (so they are not zombiefied) *and* we MUST NOT
+     * fiddle with signal handlers (= shared with openvpn main), so
+     * we use double-fork() trick.
+     */
+
+    /* fork, sleep, succeed/fail according to env vars */
+    pid_t p1 = fork();
+    if (p1 < 0)                 /* Fork failed */
+    {
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+    if (p1 > 0)                 /* parent process */
+    {
+        waitpid(p1, NULL, 0);
+        return OPENVPN_PLUGIN_FUNC_DEFERRED;
+    }
+
+    /* first gen child process, fork() again and exit() right away */
+    pid_t p2 = fork();
+    if (p2 < 0)
+    {
+        plugin_log(PLOG_ERR|PLOG_ERRNO, MODULE, "BACKGROUND: fork(2) failed");
+        exit(1);
+    }
+    if (p2 > 0)                 /* new parent: exit right away */
+    {
+        exit(0);
+    }
+
+    /* (grand-)child process
+     *  - never call "return" now (would mess up openvpn)
+     *  - return status is communicated by file
+     *  - then exit()
+     */
+
+    /* do mighty complicated work that will really take time here... */
+    plugin_log(PLOG_NOTE, MODULE, "in async/deferred handler, sleep(%d)", seconds);
+    sleep(seconds);
+
+    /* write config options to openvpn */
+    int ret = write_cc_options_file(name, envp);
+
+    /* by setting "UV_WANT_CC_FAIL" we can be triggered to fail */
+    const char *p = get_env("UV_WANT_CC_FAIL", envp);
+    if (p)
+    {
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC_FAIL=%s -> fail", p);
+        ret = OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    /* now signal success/failure state to openvpn */
+    fd = open(ccd_file, O_WRONLY);
+    if (fd < 0)
+    {
+        plugin_log(PLOG_ERR|PLOG_ERRNO, MODULE, "open('%s') failed", ccd_file);
+        exit(1);
+    }
+
+    plugin_log(PLOG_NOTE, MODULE, "cc_handle_deferred_v1: done, signalling %s",
+               (ret == OPENVPN_PLUGIN_FUNC_SUCCESS) ? "success" : "fail" );
+
+    if (write(fd, (ret == OPENVPN_PLUGIN_FUNC_SUCCESS) ? "1" : "0", 1) != 1)
+    {
+        plugin_log(PLOG_ERR|PLOG_ERRNO, MODULE, "write to '%s' failed", ccd_file );
+    }
+    close(fd);
+
+    exit(0);
+}
+
+int
+openvpn_plugin_client_connect(struct plugin_context *context,
+                              const char **argv,
+                              const char **envp)
+{
+    /* log environment variables handed to us by OpenVPN, but
+     * only if "setenv verb" is 3 or higher (arbitrary number)
+     */
+    if (context->verb>=3)
+    {
+        for (int i = 0; argv[i]; i++)
+        {
+            plugin_log(PLOG_NOTE, MODULE, "per-client argv: %s", argv[i]);
+        }
+        for (int i = 0; envp[i]; i++)
+        {
+            plugin_log(PLOG_NOTE, MODULE, "per-client env: %s", envp[i]);
+        }
+    }
+
+    /* by setting "UV_WANT_CC_ASYNC" we go to async/deferred mode */
+    const char *p = get_env("UV_WANT_CC_ASYNC", envp);
+    if (p)
+    {
+        /* the return value will usually be OPENVPN_PLUGIN_FUNC_DEFERRED
+         * ("I will do my job in the background, check the status file!")
+         * but depending on env setup it might be "..._ERRROR"
+         */
+        return cc_handle_deferred_v1(atoi(p), argv[1], envp);
+    }
+
+    /* -- this is synchronous mode (openvpn waits for us) -- */
+
+    /* by setting "UV_WANT_CC_FAIL" we can be triggered to fail */
+    p = get_env("UV_WANT_CC_FAIL", envp);
+    if (p)
+    {
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC_FAIL=%s -> fail", p);
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    /* does the caller want options?  give them some */
+    int ret = write_cc_options_file(argv[1], envp);
+
+    return ret;
+}
+
+int
+openvpn_plugin_client_connect_v2(struct plugin_context *context,
+                                 struct plugin_per_client_context *pcc,
+                                 const char **envp,
+                                 struct openvpn_plugin_string_list **return_list)
+{
+    /* by setting "UV_WANT_CC2_ASYNC" we go to async/deferred mode */
+    const char *want_async = get_env("UV_WANT_CC2_ASYNC", envp);
+    const char *want_fail = get_env("UV_WANT_CC2_FAIL", envp);
+    const char *want_disable = get_env("UV_WANT_CC2_DISABLE", envp);
+
+    /* config to push towards client - can be controlled by OpenVPN
+     * config ("setenv plugin_cc2_config ...") - mostly useful in a
+     * regression test environment to push stuff like routes which are
+     * then verified by t_client ping tests
+     */
+    const char *client_config = get_env("plugin_cc2_config", envp);
+    if (!client_config)
+    {
+        /* pick something meaningless which can be verified in client log */
+        client_config = "push \"setenv CC2 MOOH\"\n";
+    }
+
+    if (want_async)
+    {
+        /* we do no really useful work here, so we just tell the
+         * "CLIENT_CONNECT_DEFER_V2" handler that it should sleep
+         * and then "do things" via the per-client-context
+         */
+        pcc->sleep_until = time(NULL) + atoi(want_async);
+        pcc->want_fail = (want_fail != NULL);
+        pcc->want_disable = (want_disable != NULL);
+        pcc->client_config = client_config;
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC2_ASYNC=%s -> set up deferred handler", want_async);
+        return OPENVPN_PLUGIN_FUNC_DEFERRED;
+    }
+
+    /* by setting "UV_WANT_CC2_FAIL" we can be triggered to fail here */
+    if (want_fail)
+    {
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC2_FAIL=%s -> fail", want_fail);
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    struct openvpn_plugin_string_list *rl =
+        calloc(1, sizeof(struct openvpn_plugin_string_list));
+    if (!rl)
+    {
+        plugin_log(PLOG_ERR, MODULE, "malloc(return_list) failed");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+    rl->name = strdup("config");
+    if (want_disable)
+    {
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC2_DISABLE, reject");
+        rl->value = strdup("disable\n");
+    }
+    else
+    {
+        rl->value = strdup(client_config);
+    }
+
+    if (!rl->name || !rl->value)
+    {
+        plugin_log(PLOG_ERR, MODULE, "malloc(return_list->xx) failed");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    *return_list = rl;
+
+    return OPENVPN_PLUGIN_FUNC_SUCCESS;
+}
+
+int
+openvpn_plugin_client_connect_defer_v2(struct plugin_context *context,
+                                       struct plugin_per_client_context *pcc,
+                                       struct openvpn_plugin_string_list
+                                       **return_list)
+{
+    time_t time_left = pcc->sleep_until - time(NULL);
+    plugin_log(PLOG_NOTE, MODULE, "defer_v2: seconds left=%d",
+               (int) time_left);
+
+    /* not yet due? */
+    if (time_left > 0)
+    {
+        return OPENVPN_PLUGIN_FUNC_DEFERRED;
+    }
+
+    /* client wants fail? */
+    if (pcc->want_fail)
+    {
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC2_FAIL -> fail" );
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    /* fill in RL according to with-disable / without-disable */
+
+    /* TODO: unify this with non-deferred case */
+    struct openvpn_plugin_string_list *rl =
+        calloc(1, sizeof(struct openvpn_plugin_string_list));
+    if (!rl)
+    {
+        plugin_log(PLOG_ERR, MODULE, "malloc(return_list) failed");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+    rl->name = strdup("config");
+    if (pcc->want_disable)
+    {
+        plugin_log(PLOG_NOTE, MODULE, "env has UV_WANT_CC2_DISABLE, reject");
+        rl->value = strdup("disable\n");
+    }
+    else
+    {
+        rl->value = strdup(pcc->client_config);
+    }
+
+    if (!rl->name || !rl->value)
+    {
+        plugin_log(PLOG_ERR, MODULE, "malloc(return_list->xx) failed");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
+    *return_list = rl;
+
+    return OPENVPN_PLUGIN_FUNC_SUCCESS;
+}
+
+OPENVPN_EXPORT int
+openvpn_plugin_func_v2(openvpn_plugin_handle_t handle,
+                       const int type,
+                       const char *argv[],
+                       const char *envp[],
+                       void *per_client_context,
+                       struct openvpn_plugin_string_list **return_list)
+{
+    struct plugin_context *context = (struct plugin_context *) handle;
+    struct plugin_per_client_context *pcc = (struct plugin_per_client_context *) per_client_context;
+
+    /* for most functions, we just "don't do anything" but log the
+     * event received (so one can follow it in the log and understand
+     * the sequence of events).  CONNECT and CONNECT_V2 are handled
+     */
+    switch (type)
+    {
+        case OPENVPN_PLUGIN_UP:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_UP");
+            break;
+
+        case OPENVPN_PLUGIN_DOWN:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_DOWN");
+            break;
+
+        case OPENVPN_PLUGIN_ROUTE_UP:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_ROUTE_UP");
+            break;
+
+        case OPENVPN_PLUGIN_IPCHANGE:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_IPCHANGE");
+            break;
+
+        case OPENVPN_PLUGIN_TLS_VERIFY:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_TLS_VERIFY");
+            break;
+
+        case OPENVPN_PLUGIN_CLIENT_CONNECT:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_CLIENT_CONNECT");
+            return openvpn_plugin_client_connect(context, argv, envp);
+
+        case OPENVPN_PLUGIN_CLIENT_CONNECT_V2:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_CLIENT_CONNECT_V2");
+            return openvpn_plugin_client_connect_v2(context, pcc, envp,
+                                                    return_list);
+
+        case OPENVPN_PLUGIN_CLIENT_CONNECT_DEFER_V2:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_CLIENT_CONNECT_DEFER_V2");
+            return openvpn_plugin_client_connect_defer_v2(context, pcc,
+                                                          return_list);
+
+        case OPENVPN_PLUGIN_CLIENT_DISCONNECT:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_CLIENT_DISCONNECT");
+            break;
+
+        case OPENVPN_PLUGIN_LEARN_ADDRESS:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_LEARN_ADDRESS");
+            break;
+
+        case OPENVPN_PLUGIN_TLS_FINAL:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_TLS_FINAL");
+            break;
+
+        default:
+            plugin_log(PLOG_NOTE, MODULE, "OPENVPN_PLUGIN_? type=%d\n", type);
+    }
+    return OPENVPN_PLUGIN_FUNC_SUCCESS;
+}
+
+OPENVPN_EXPORT void *
+openvpn_plugin_client_constructor_v1(openvpn_plugin_handle_t handle)
+{
+    printf("FUNC: openvpn_plugin_client_constructor_v1\n");
+    return calloc(1, sizeof(struct plugin_per_client_context));
+}
+
+OPENVPN_EXPORT void
+openvpn_plugin_client_destructor_v1(openvpn_plugin_handle_t handle, void *per_client_context)
+{
+    printf("FUNC: openvpn_plugin_client_destructor_v1\n");
+    free(per_client_context);
+}
+
+OPENVPN_EXPORT void
+openvpn_plugin_close_v1(openvpn_plugin_handle_t handle)
+{
+    struct plugin_context *context = (struct plugin_context *) handle;
+    printf("FUNC: openvpn_plugin_close_v1\n");
+    free(context);
+}
diff --git a/sample/sample-plugins/defer/README b/sample/sample-plugins/defer/README
deleted file mode 100644
index d8990f8..0000000
--- a/sample/sample-plugins/defer/README
+++ /dev/null
@@ -1,16 +0,0 @@
-OpenVPN plugin examples.
-
-Examples provided:
-
-simple.c -- using the --auth-user-pass-verify callback,
-            test deferred authentication.
-
-To build:
-
-  ./build simple (Linux/BSD/etc.)
-  ./winbuild simple (MinGW on Windows)
-
-To use in OpenVPN, add to config file:
-
-  plugin simple.so (Linux/BSD/etc.)
-  plugin simple.dll (MinGW on Windows)
diff --git a/sample/sample-plugins/defer/build b/sample/sample-plugins/defer/build
deleted file mode 100755
index ba41a39..0000000
--- a/sample/sample-plugins/defer/build
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/sh
-
-#
-# Build an OpenVPN plugin module on *nix.  The argument should
-# be the base name of the C source file (without the .c).
-#
-
-# This directory is where we will look for openvpn-plugin.h
-CPPFLAGS="${CPPFLAGS:--I../../../include}"
-
-CC="${CC:-gcc}"
-CFLAGS="${CFLAGS:--O2 -Wall -g}"
-
-$CC $CPPFLAGS $CFLAGS -fPIC -c $1.c && \
-$CC $CFLAGS -fPIC -shared ${LDFLAGS} -Wl,-soname,$1.so -o $1.so $1.o -lc
diff --git a/sample/sample-plugins/defer/simple.c b/sample/sample-plugins/defer/simple.c
index d18695b..64338b4 100644
--- a/sample/sample-plugins/defer/simple.c
+++ b/sample/sample-plugins/defer/simple.c
@@ -141,6 +141,11 @@ openvpn_plugin_open_v1(unsigned int *type_mask, const char *argv[], const char *
      * Allocate our context
      */
     context = (struct plugin_context *) calloc(1, sizeof(struct plugin_context));
+    if (context == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return NULL;
+    }
 
     context->test_deferred_auth = atoi_null0(get_env("test_deferred_auth", envp));
     printf("TEST_DEFERRED_AUTH %d\n", context->test_deferred_auth);
diff --git a/sample/sample-plugins/keying-material-exporter-demo/build b/sample/sample-plugins/keying-material-exporter-demo/build
deleted file mode 100755
index bbb05f7..0000000
--- a/sample/sample-plugins/keying-material-exporter-demo/build
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/sh
-
-#
-# Build an OpenVPN plugin module on *nix.  The argument should
-# be the base name of the C source file (without the .c).
-#
-
-# This directory is where we will look for openvpn-plugin.h
-CPPFLAGS="${CPPFLAGS:--I../../..}"
-
-CC="${CC:-gcc}"
-CFLAGS="${CFLAGS:--O2 -Wall -g}"
-
-$CC $CPPFLAGS $CFLAGS -fPIC -c $1.c && \
-$CC $CFLAGS -fPIC -shared $LDFLAGS -Wl,-soname,$1.so -o $1.so $1.o -lc
diff --git a/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c b/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
index b53f13f..27275f3 100644
--- a/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
+++ b/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
@@ -92,6 +92,12 @@ openvpn_plugin_open_v3(const int version,
 {
     struct plugin *plugin = calloc(1, sizeof(*plugin));
 
+    if (plugin == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
     plugin->type = get_env("remote_1", args->envp) ? CLIENT : SERVER;
     plugin->log  = args->callbacks->plugin_log;
 
diff --git a/sample/sample-plugins/log/build b/sample/sample-plugins/log/build
deleted file mode 100755
index c07ec40..0000000
--- a/sample/sample-plugins/log/build
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/sh
-
-#
-# Build an OpenVPN plugin module on *nix.  The argument should
-# be the base name of the C source file (without the .c).
-#
-
-# This directory is where we will look for openvpn-plugin.h
-CPPFLAGS="${CPPFLAGS:--I../../../include}"
-
-CC="${CC:-gcc}"
-CFLAGS="${CFLAGS:--O2 -Wall -g}"
-
-$CC $CPPFLAGS $CFLAGS -fPIC -c $1.c && \
-$CC $CFLAGS -fPIC -shared $LDFLAGS -Wl,-soname,$1.so -o $1.so $1.o -lc
diff --git a/sample/sample-plugins/log/log.c b/sample/sample-plugins/log/log.c
index b5c1c3b..a782aa9 100644
--- a/sample/sample-plugins/log/log.c
+++ b/sample/sample-plugins/log/log.c
@@ -78,6 +78,11 @@ openvpn_plugin_open_v1(unsigned int *type_mask, const char *argv[], const char *
      * Allocate our context
      */
     context = (struct plugin_context *) calloc(1, sizeof(struct plugin_context));
+    if (context == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return NULL;
+    }
 
     /*
      * Set the username/password we will require.
diff --git a/sample/sample-plugins/log/log_v3.c b/sample/sample-plugins/log/log_v3.c
index 17b83f3..1344499 100644
--- a/sample/sample-plugins/log/log_v3.c
+++ b/sample/sample-plugins/log/log_v3.c
@@ -113,6 +113,11 @@ openvpn_plugin_open_v3(const int v3structver,
 
     /* Allocate our context */
     context = (struct plugin_context *) calloc(1, sizeof(struct plugin_context));
+    if (context == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
 
     /* Set the username/password we will require. */
     context->username = "foo";
diff --git a/sample/sample-plugins/simple/README b/sample/sample-plugins/simple/README
deleted file mode 100644
index 4400cd3..0000000
--- a/sample/sample-plugins/simple/README
+++ /dev/null
@@ -1,16 +0,0 @@
-OpenVPN plugin examples.
-
-Examples provided:
-
-simple.c -- using the --auth-user-pass-verify callback, verify
-            that the username/password is "foo"/"bar".
-
-To build:
-
-  ./build simple (Linux/BSD/etc.)
-  ./winbuild simple (MinGW on Windows)
-
-To use in OpenVPN, add to config file:
-
-  plugin simple.so (Linux/BSD/etc.)
-  plugin simple.dll (MinGW on Windows)
diff --git a/sample/sample-plugins/simple/build b/sample/sample-plugins/simple/build
deleted file mode 100755
index bbb05f7..0000000
--- a/sample/sample-plugins/simple/build
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/sh
-
-#
-# Build an OpenVPN plugin module on *nix.  The argument should
-# be the base name of the C source file (without the .c).
-#
-
-# This directory is where we will look for openvpn-plugin.h
-CPPFLAGS="${CPPFLAGS:--I../../..}"
-
-CC="${CC:-gcc}"
-CFLAGS="${CFLAGS:--O2 -Wall -g}"
-
-$CC $CPPFLAGS $CFLAGS -fPIC -c $1.c && \
-$CC $CFLAGS -fPIC -shared $LDFLAGS -Wl,-soname,$1.so -o $1.so $1.o -lc
diff --git a/sample/sample-plugins/simple/simple.c b/sample/sample-plugins/simple/simple.c
index 950c547..60cfea4 100644
--- a/sample/sample-plugins/simple/simple.c
+++ b/sample/sample-plugins/simple/simple.c
@@ -80,6 +80,11 @@ openvpn_plugin_open_v1(unsigned int *type_mask, const char *argv[], const char *
      * Allocate our context
      */
     context = (struct plugin_context *) calloc(1, sizeof(struct plugin_context));
+    if (context == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return NULL;
+    }
 
     /*
      * Set the username/password we will require.