openvpn/configure.ac

dnl  OpenVPN -- An application to securely tunnel IP networks
dnl             over a single UDP port, with support for SSL/TLS-based
dnl             session authentication and key exchange,
dnl             packet encryption, packet authentication, and
dnl             packet compression.
dnl
dnl  Copyright (C) 2002-2017 OpenVPN Technologies, Inc. <sales@openvpn.net>
dnl  Copyright (C) 2006-2012 Alon Bar-Lev <alon.barlev@gmail.com>
dnl
dnl  This program is free software; you can redistribute it and/or modify
dnl  it under the terms of the GNU General Public License as published by
dnl  the Free Software Foundation; either version 2 of the License, or
dnl  (at your option) any later version.
dnl
dnl  This program is distributed in the hope that it will be useful,
dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl  GNU General Public License for more details.
dnl
dnl  You should have received a copy of the GNU General Public License
dnl  along with this program (see the file COPYING included with this
dnl  distribution); if not, write to the Free Software Foundation, Inc.,
dnl  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.59)

m4_include(version.m4)
AC_INIT([PRODUCT_NAME], [PRODUCT_VERSION], [PRODUCT_BUGREPORT], [PRODUCT_TARNAME])
m4_include(compat.m4)
AC_DEFINE([OPENVPN_VERSION_RESOURCE], [PRODUCT_VERSION_RESOURCE], [Version in windows resource format])

AC_CONFIG_AUX_DIR([.])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_SRCDIR([src/openvpn/syshead.h])
AC_CONFIG_MACRO_DIR([m4])

dnl Initialize automake.  automake < 1.12 didn't have serial-tests and
dnl gives an error if it sees this, but for automake >= 1.13
dnl serial-tests is required so we have to include it.  Solution is to
dnl test for the version of automake (by running an external command)
dnl and provide it if necessary.  Note we have to do this entirely using
dnl m4 macros since automake queries this macro by running
dnl 'autoconf --trace ...'.
m4_define([serial_tests], [
    m4_esyscmd([automake --version |
                head -1 |
                awk '{split ($NF,a,"."); if (a[1] == 1 && a[2] >= 12) { print "serial-tests" }}'
    ])
])
AM_INIT_AUTOMAKE(foreign serial_tests) dnl NB: Do not [quote] this parameter.
AC_CANONICAL_HOST
AC_USE_SYSTEM_EXTENSIONS

AC_ARG_ENABLE(
	[lzo],
	[AS_HELP_STRING([--disable-lzo], [disable LZO compression support @<:@default=yes@:>@])],
	,
	[enable_lzo="yes"]
)

AC_ARG_ENABLE(
	[lzo-stub],
	[AS_HELP_STRING([--enable-lzo-stub], [don't compile LZO compression support but still allow limited interoperability with LZO-enabled peers @<:@default=no@:>@])],
	,
	[enable_lzo_stub="no"]
)

AC_ARG_ENABLE(
	[crypto],
	[AS_HELP_STRING([--disable-crypto], [disable crypto support @<:@default=yes@:>@])],
	,
	[enable_crypto="yes"]
)

AC_ARG_ENABLE(
	[ofb-cfb],
	[AS_HELP_STRING([--disable-ofb-cfb], [disable support for OFB and CFB cipher modes @<:@default=yes@:>@])],
	,
	[enable_crypto_ofb_cfb="yes"]
)

AC_ARG_ENABLE(
	[ssl],
	[AS_HELP_STRING([--disable-ssl], [disable SSL support for TLS-based key exchange @<:@default=yes@:>@])],
	,
	[enable_ssl="yes"]
)

AC_ARG_ENABLE(
	[x509-alt-username],
	[AS_HELP_STRING([--enable-x509-alt-username], [enable the --x509-username-field feature @<:@default=no@:>@])],
	,
	[enable_x509_alt_username="no"]
)

AC_ARG_ENABLE(
	[multi],
	[AS_HELP_STRING([--disable-multi], [disable client/server support (--mode server + client mode) @<:@default=yes@:>@])],
	,
	[enable_multi="yes"]
)

AC_ARG_ENABLE(
	[server],
	[AS_HELP_STRING([--disable-server], [disable server support only (but retain client support) @<:@default=yes@:>@])],
	,
	[enable_server="yes"]
)

AC_ARG_ENABLE(
	[plugins],
	[AS_HELP_STRING([--disable-plugins], [disable plug-in support @<:@default=yes@:>@])],
	,
	[enable_plugins="yes"]
)

AC_ARG_ENABLE(
	[management],
	[AS_HELP_STRING([--disable-management], [disable management server support @<:@default=yes@:>@])],
	,
	[enable_management="yes"]
)

AC_ARG_ENABLE(
	[pkcs11],
	[AS_HELP_STRING([--enable-pkcs11], [enable pkcs11 support @<:@default=no@:>@])],
	,
	[enable_pkcs11="no"]
)

AC_ARG_ENABLE(
	[socks],
	[AS_HELP_STRING([--disable-socks], [disable Socks support @<:@default=yes@:>@])],
	,
	[enable_socks="yes"]
)

AC_ARG_ENABLE(
	[http-proxy],
	[AS_HELP_STRING([--disable-http-proxy], [disable HTTP proxy support @<:@default=yes@:>@])],
	,
	[enable_http_proxy="yes"]
)

AC_ARG_ENABLE(
	[fragment],
	[AS_HELP_STRING([--disable-fragment], [disable internal fragmentation support (--fragment) @<:@default=yes@:>@])],
	,
	[enable_fragment="yes"]
)

AC_ARG_ENABLE(
	[multihome],
	[AS_HELP_STRING([--disable-multihome], [disable multi-homed UDP server support (--multihome) @<:@default=yes@:>@])],
	,
	[enable_multihome="yes"]
)

AC_ARG_ENABLE(
	[port-share],
	[AS_HELP_STRING([--disable-port-share], [disable TCP server port-share support (--port-share) @<:@default=yes@:>@])],
	,
	[enable_port_share="yes"]
)

AC_ARG_ENABLE(
	[debug],
	[AS_HELP_STRING([--disable-debug], [disable debugging support (disable gremlin and verb 7+ messages) @<:@default=yes@:>@])],
	,
	[enable_debug="yes"]
)

AC_ARG_ENABLE(
	[small],
	[AS_HELP_STRING([--enable-small], [enable smaller executable size (disable OCC, usage message, and verb 4 parm list) @<:@default=no@:>@])],
	,
	[enable_small="no"]
)

AC_ARG_ENABLE(
	[iproute2],
	[AS_HELP_STRING([--enable-iproute2], [enable support for iproute2 @<:@default=no@:>@])],
	,
	[enable_iproute2="no"]
)

AC_ARG_ENABLE(
	[def-auth],
	[AS_HELP_STRING([--disable-def-auth], [disable deferred authentication @<:@default=yes@:>@])],
	,
	[enable_def_auth="yes"]
)

AC_ARG_ENABLE(
	[pf],
	[AS_HELP_STRING([--disable-pf], [disable internal packet filter @<:@default=yes@:>@])],
	,
	[enable_pf="yes"]
)

AC_ARG_ENABLE(
	[plugin-auth-pam],
	[AS_HELP_STRING([--disable-plugin-auth-pam], [disable auth-pam plugin @<:@default=platform specific@:>@])],
	,
	[
		case "$host" in
			*-*-openbsd*) enable_plugin_auth_pam="no";;
			*-mingw*) enable_plugin_auth_pam="no";;
			*) enable_plugin_auth_pam="yes";;
		esac
	]
)

AC_ARG_ENABLE(
	[plugin-down-root],
	[AS_HELP_STRING([--disable-plugin-down-root], [disable down-root plugin @<:@default=platform specific@:>@])],
	,
	[
		case "$host" in
			*-mingw*) enable_plugin_down_root="no";;
			*) enable_plugin_down_root="yes";;
		esac
	]
)

AC_ARG_ENABLE(
	[pam-dlopen],
	[AS_HELP_STRING([--enable-pam-dlopen], [dlopen libpam @<:@default=no@:>@])],
	,
	[enable_pam_dlopen="no"]
)

AC_ARG_ENABLE(
	[strict],
	[AS_HELP_STRING([--enable-strict], [enable strict compiler warnings (debugging option) @<:@default=no@:>@])],
	,
	[enable_strict="no"]
)

AC_ARG_ENABLE(
	[pedantic],
	[AS_HELP_STRING([--enable-pedantic], [enable pedantic compiler warnings, will not generate a working executable (debugging option) @<:@default=no@:>@])],
	,
	[enable_pedantic="no"]
)

AC_ARG_ENABLE(
	[strict-options],
	[AS_HELP_STRING([--enable-strict-options], [enable strict options check between peers (debugging option) @<:@default=no@:>@])],
	,
	[enable_strict_options="no"]
)

AC_ARG_ENABLE(
	[selinux],
	[AS_HELP_STRING([--enable-selinux], [enable SELinux support @<:@default=no@:>@])],
	,
	[enable_selinux="no"]
)

AC_ARG_ENABLE(
	[systemd],
	[AS_HELP_STRING([--enable-systemd], [enable systemd suppport @<:@default=no@:>@])],
	,
	[enable_systemd="no"]
)

AC_ARG_WITH(
	[special-build],
	[AS_HELP_STRING([--with-special-build=STRING], [specify special build string])],
	[test -n "${withval}" && AC_DEFINE_UNQUOTED([CONFIGURE_SPECIAL_BUILD], ["${withval}"], [special build string])]
)

AC_ARG_WITH(
	[mem-check],
	[AS_HELP_STRING([--with-mem-check=TYPE], [build with debug memory checking, TYPE=no|dmalloc|valgrind|ssl @<:@default=no@:>@])],
	[
		case "${withval}" in
			dmalloc|valgrind|ssl|no) ;;
			*) AC_MSG_ERROR([bad value ${withval} for --mem-check]) ;;
		esac
	],
	[with_mem_check="no"]
)

AC_ARG_WITH(
	[crypto-library],
	[AS_HELP_STRING([--with-crypto-library=library], [build with the given crypto library, TYPE=openssl|polarssl @<:@default=openssl@:>@])],
	[
		case "${withval}" in 
			openssl|polarssl) ;;
			*) AC_MSG_ERROR([bad value ${withval} for --with-crypto-library]) ;;
		esac
	],
	[with_crypto_library="openssl"]
)

AC_ARG_WITH(
	[plugindir],
	[AS_HELP_STRING([--with-plugindir], [plugin directory @<:@default=LIBDIR/openvpn@:>@])],
	,
	[with_plugindir="\$(libdir)/openvpn/plugins"]
)


AC_DEFINE_UNQUOTED([TARGET_ALIAS], ["${host}"], [A string representing our host])
case "$host" in
	*-*-linux*)
		AC_DEFINE([TARGET_LINUX], [1], [Are we running on Linux?])
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["L"], [Target prefix])
		;;
	*-*-solaris*)
		AC_DEFINE([TARGET_SOLARIS], [1], [Are we running on Solaris?])
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["S"], [Target prefix])
		;;
	*-*-openbsd*)
		AC_DEFINE([TARGET_OPENBSD], [1], [Are we running on OpenBSD?])
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["O"], [Target prefix])
		;;
	*-*-freebsd*)
		AC_DEFINE([TARGET_FREEBSD], [1], [Are we running on FreeBSD?])
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["F"], [Target prefix])
		;;
	*-*-netbsd*)
		AC_DEFINE([TARGET_NETBSD], [1], [Are we running NetBSD?])
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["N"], [Target prefix])
		;;
	*-*-darwin*)
		AC_DEFINE([TARGET_DARWIN], [1], [Are we running on Mac OS X?])
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["M"], [Target prefix])
		have_tap_header="yes"
		dnl some Mac OS X tendering (we use vararg macros...)
		CPPFLAGS="$CPPFLAGS -no-cpp-precomp"
		;;
	*-mingw*)
		AC_DEFINE([TARGET_WIN32], [1], [Are we running WIN32?])
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["W"], [Target prefix])
		CPPFLAGS="${CPPFLAGS} -DWIN32_LEAN_AND_MEAN"
		CPPFLAGS="${CPPFLAGS} -DNTDDI_VERSION=NTDDI_WINXP -D_WIN32_WINNT=_WIN32_WINNT_WINXP"
		WIN32=yes
		;;
	*-*-dragonfly*)
		AC_DEFINE([TARGET_DRAGONFLY], [1], [Are we running on DragonFlyBSD?])
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["D"], [Target prefix])
		;;
	*)
		AC_DEFINE_UNQUOTED([TARGET_PREFIX], ["X"], [Target prefix])
		have_tap_header="yes"
		;;
esac

PKG_PROG_PKG_CONFIG
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_SED
AC_PROG_MAKE_SET

AC_ARG_VAR([IFCONFIG], [full path to ipconfig utility])
AC_ARG_VAR([ROUTE], [full path to route utility])
AC_ARG_VAR([IPROUTE], [full path to ip utility])
AC_ARG_VAR([NETSTAT], [path to netstat utility]) # tests
AC_ARG_VAR([MAN2HTML], [path to man2html utility])
AC_ARG_VAR([GIT], [path to git utility])
AC_ARG_VAR([SYSTEMD_ASK_PASSWORD], [path to systemd-ask-password utility])
AC_PATH_PROGS([IFCONFIG], [ifconfig],, [$PATH:/usr/local/sbin:/usr/sbin:/sbin])
AC_PATH_PROGS([ROUTE], [route],, [$PATH:/usr/local/sbin:/usr/sbin:/sbin])
AC_PATH_PROGS([IPROUTE], [ip],, [$PATH:/usr/local/sbin:/usr/sbin:/sbin])
AC_PATH_PROGS([SYSTEMD_ASK_PASSWORD], [systemd-ask-password],, [$PATH:/usr/local/bin:/usr/bin:/bin])
AC_CHECK_PROGS([NETSTAT], [netstat], [netstat], [$PATH:/usr/local/sbin:/usr/sbin:/sbin:/etc]) # tests
AC_CHECK_PROGS([MAN2HTML], [man2html])
AC_CHECK_PROGS([GIT], [git]) # optional
AC_DEFINE_UNQUOTED([IFCONFIG_PATH], ["$IFCONFIG"], [Path to ifconfig tool])
AC_DEFINE_UNQUOTED([IPROUTE_PATH], ["$IPROUTE"], [Path to iproute tool])
AC_DEFINE_UNQUOTED([ROUTE_PATH], ["$ROUTE"], [Path to route tool])
AC_DEFINE_UNQUOTED([SYSTEMD_ASK_PASSWORD_PATH], ["$SYSTEMD_ASK_PASSWORD"], [Path to systemd-ask-password tool])

#
# Libtool
#
ifdef(
	[LT_INIT],
	[
		LT_INIT([win32-dll])
		LT_LANG([Windows Resource])
	],
	[
		AC_LIBTOOL_WIN32_DLL
		AC_LIBTOOL_RC
		AC_PROG_LIBTOOL
	]
)

AC_C_CONST
AC_C_INLINE
AC_C_VOLATILE
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_UID_T
AC_TYPE_INT8_T
AC_TYPE_INT16_T
AC_TYPE_INT32_T
AC_TYPE_INT64_T
AC_TYPE_UINT8_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AC_TYPE_SIGNAL
AX_CPP_VARARG_MACRO_ISO
AX_CPP_VARARG_MACRO_GCC
AX_TYPE_SOCKLEN_T
AX_EMPTY_ARRAY
AC_CHECK_SIZEOF([unsigned int])
AC_CHECK_SIZEOF([unsigned long])
AC_CHECK_HEADERS([ \
	stdio.h stdarg.h stdbool.h limits.h \
	time.h errno.h fcntl.h io.h direct.h \
	ctype.h sys/types.h sys/socket.h \
	signal.h unistd.h dlfcn.h \
	netinet/in.h netinet/in_systm.h \
	netinet/tcp.h arpa/inet.h netdb.h \
	windows.h winsock2.h ws2tcpip.h \
	versionhelpers.h \
])
AC_CHECK_HEADERS([ \
	sys/time.h sys/ioctl.h sys/stat.h \
	sys/mman.h sys/file.h sys/wait.h \
	unistd.h signal.h libgen.h stropts.h \
	syslog.h pwd.h grp.h \
	sys/sockio.h sys/uio.h linux/sockios.h \
	linux/types.h sys/poll.h sys/epoll.h err.h \
])

SOCKET_INCLUDES="
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
#ifdef HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#ifdef HAVE_NETINET_IN_SYSTM_H
#include <netinet/in_systm.h>
#endif
#ifdef HAVE_NETINET_IP_H
#include <netinet/ip.h>
#endif
"

AC_CHECK_HEADERS(
	[net/if.h netinet/ip.h resolv.h sys/un.h net/if_utun.h sys/kern_control.h],
	,
	,
	[[${SOCKET_INCLUDES}]]
)

AC_CHECK_TYPES(
	[in_addr_t],
	,
	[AC_DEFINE([in_addr_t], [uint32_t], [Workaround missing in_addr_t])],
	[[${SOCKET_INCLUDES}]]
)
AC_CHECK_TYPE(
	[struct iphdr],
	[AC_DEFINE([HAVE_IPHDR], [1], [struct iphdr needed for IPv6 support])],
	,
	[[${SOCKET_INCLUDES}]]
)
AC_CHECK_TYPE(
	[struct sock_extended_err],
	[AC_DEFINE([HAVE_SOCK_EXTENDED_ERR], [1], [struct sock_extended_err needed for extended socket error support])],
	,
	[[${SOCKET_INCLUDES}]]
)
AC_CHECK_TYPE(
	[struct msghdr],
	[AC_DEFINE([HAVE_MSGHDR], [1], [struct msghdr needed for extended socket error support])],
	,
	[[${SOCKET_INCLUDES}]]
)
AC_CHECK_TYPE(
	[struct cmsghdr],
	[AC_DEFINE([HAVE_CMSGHDR], [1], [struct cmsghdr needed for extended socket error support])],
	,
	[[${SOCKET_INCLUDES}]]
)
AC_CHECK_TYPE(
	[struct in_pktinfo],
	[AC_DEFINE([HAVE_IN_PKTINFO], [1], [struct in_pktinfo needed for IP_PKTINFO support])],
	,
	[[${SOCKET_INCLUDES}]]
)
AC_CHECK_TYPE(
	[struct sockaddr_in6],
	,
	[AC_MSG_ERROR([struct sockaddr_in6 not found, needed for ipv6 transport support.])],
	[[${SOCKET_INCLUDES}]]
)
AC_CHECK_DECLS(
	[SO_MARK],
	,
	,
	[[${SOCKET_INCLUDES}]]
)

dnl We emulate signals in Windows
AC_CHECK_DECLS(
	[SIGHUP],
	,
	[AC_DEFINE([SIGHUP], [1], [SIGHUP replacement])],
	[[
		#ifdef HAVE_SIGNAL_H
		#include <signal.h>
		#endif
	]]
)
AC_CHECK_DECLS(
	[SIGINT],
	,
	[AC_DEFINE([SIGINT], [2], [SIGINT replacement])],
	[[
		#ifdef HAVE_SIGNAL_H
		#include <signal.h>
		#endif
	]]
)
AC_CHECK_DECLS(
	[SIGUSR1],
	,
	[AC_DEFINE([SIGUSR1], [10], [SIGUSR1 replacement])],
	[[
		#ifdef HAVE_SIGNAL_H
		#include <signal.h>
		#endif
	]]
)
AC_CHECK_DECLS(
	[SIGUSR2],
	,
	[AC_DEFINE([SIGUSR2], [12], [SIGUSR2 replacement])],
	[[
		#ifdef HAVE_SIGNAL_H
		#include <signal.h>
		#endif
	]]
)
AC_CHECK_DECLS(
	[SIGTERM],
	,
	[AC_DEFINE([SIGTERM], [15], [SIGTERM replacement])],
	[[
		#ifdef HAVE_SIGNAL_H
		#include <signal.h>
		#endif
	]]
)

AC_FUNC_FORK

AC_CHECK_FUNCS([ \
	daemon chroot getpwnam setuid nice system getpid dup dup2 \
	getpass strerror syslog openlog mlockall getgrnam setgid \
	setgroups stat flock readv writev time gettimeofday \
	ctime memset vsnprintf strdup \
	setsid chdir putenv getpeername unlink \
	chsize ftruncate execve getpeereid umask basename dirname access \
	epoll_create \
])

AC_CHECK_LIB(
	[dl],
	[dlopen],
	[DL_LIBS="-ldl"]
)
AC_SUBST([DL_LIBS])

AC_CHECK_LIB(
	[nsl],
	[inet_ntoa],
	[SOCKETS_LIBS="${SOCKETS_LIBS} -lnsl"]
)
AC_CHECK_LIB(
	[socket],
	[socket],
	[SOCKETS_LIBS="${SOCKETS_LIBS} -lsocket"]
)
AC_CHECK_LIB(
	[resolv],
	[gethostbyname],
	[SOCKETS_LIBS="${SOCKETS_LIBS} -lresolv"]
)
AC_SUBST([SOCKETS_LIBS])

old_LIBS="${LIBS}"
LIBS="${LIBS} ${SOCKETS_LIBS}"
AC_CHECK_FUNCS([sendmsg recvmsg inet_ntop inet_pton])
# Windows use stdcall for winsock so we cannot auto detect these
m4_define(
	[SOCKET_FUNCS],
[socket recv recvfrom send sendto listen dnl
accept connect bind select gethostbyname inet_ntoa]dnl
)
m4_define(
	[SOCKET_OPT_FUNCS],
	[setsockopt getsockopt getsockname poll]dnl
)
if test "${WIN32}" = "yes"; then
	m4_foreach(
		[F],
		m4_split(SOCKET_FUNCS SOCKET_OPT_FUNCS),
			m4_define([UF], [[m4_join([_], [HAVE], m4_toupper(F))]])
			AC_DEFINE([UF], [1], [Win32 builtin])
	)
else
	AC_CHECK_FUNCS(
		SOCKET_FUNCS,
		,
		[AC_MSG_ERROR([Required library function not found])]
	)
	AC_CHECK_FUNCS(SOCKET_OPT_FUNCS)
fi
LIBS="${old_LIBS}"

# we assume res_init() always exist, but need to find out *where*...
AC_SEARCH_LIBS(__res_init, resolv bind, ,
    AC_SEARCH_LIBS(res_9_init, resolv bind, ,
	AC_SEARCH_LIBS(res_init, resolv bind, , )))

AC_ARG_VAR([TAP_CFLAGS], [C compiler flags for tap])
old_CFLAGS="${CFLAGS}"
CFLAGS="${CFLAGS} ${TAP_CFLAGS}"
AC_CHECK_HEADERS(
	[ \
		net/if_tun.h net/tun/if_tun.h \
		linux/if_tun.h \
		tap-windows.h \
	],
	[have_tap_header="yes"]
)
AC_CHECK_DECLS(
	[TUNSETPERSIST],
	[AC_DEFINE([ENABLE_FEATURE_TUN_PERSIST], [1], [We have persist tun capability])],
	,
	[[
		#ifdef HAVE_LINUX_IF_TUN_H
		#include <linux/if_tun.h>
		#endif
	]]
)
CFLAGS="${old_CFLAGS}"
test "${have_tap_header}" = "yes" || AC_MSG_ERROR([no tap header could be found])

AC_CHECK_LIB(
	[selinux],
	[setcon],
	[SELINUX_LIBS="-lselinux"]
)
AC_SUBST([SELINUX_LIBS])

AC_ARG_VAR([LIBPAM_CFLAGS], [C compiler flags for libpam])
AC_ARG_VAR([LIBPAM_LIBS], [linker flags for libpam])
if test -z "${LIBPAM_LIBS}"; then
	AC_CHECK_LIB(
		[pam],
		[pam_start],
		[LIBPAM_LIBS="-lpam"]
	)
fi

case "${with_mem_check}" in
	valgrind)
		AC_CHECK_HEADER(
			[valgrind/memcheck.h],
			[
				CFLAGS="${CFLAGS} -g -fno-inline"
				AC_DEFINE(
					[USE_VALGRIND],
					[1],
					[Use valgrind memory debugging library]
				)
			],
			[AC_MSG_ERROR([valgrind headers not found.])]
		)
		;;
	dmalloc)
		AC_CHECK_HEADER(
			[dmalloc.h],
			[AC_CHECK_LIB(
				[dmalloc],
				[malloc],
				[
					LIBS="${LIBS} -ldmalloc"
					AC_DEFINE(
						[DMALLOC],
						[1],
						[Use dmalloc memory debugging library]
					)
				],
				[AC_MSG_ERROR([dmalloc library not found.])]
			)],
			[AC_MSG_ERROR([dmalloc headers not found.])]
		)
		;;
	ssl)
		AC_CHECK_LIB(
			[ssl],
			[CRYPTO_mem_ctrl],
			[
				AC_DEFINE(
					[CRYPTO_MDEBUG],
					[1],
					[Use memory debugging function in OpenSSL]
				)
				AC_MSG_NOTICE([NOTE: OpenSSL library must be compiled with CRYPTO_MDEBUG])
			],
			[AC_MSG_ERROR([Memory Debugging function in OpenSSL library not found.])]
		)
		;;
esac

PKG_CHECK_MODULES(
	[PKCS11_HELPER],
	[libpkcs11-helper-1 >= 1.11],
	[have_pkcs11_helper="yes"],
	[]
)

PKG_CHECK_MODULES(
	[OPENSSL_CRYPTO],
	[libcrypto >= 0.9.6],
	[have_openssl_crypto="yes"],
	[AC_CHECK_LIB(
		[crypto],
		[RSA_new],
		[
			have_openssl_crypto="yes"
			OPENSSL_CRYPTO_LIBS="-lcrypto"
		]
	)]
)

PKG_CHECK_MODULES(
	[OPENSSL_SSL],
	[libssl >= 0.9.6],
	[have_openssl_ssl="yes"],
	[AC_CHECK_LIB(
		[ssl],
		[SSL_CTX_new],
		[
			have_openssl_ssl="yes"
			OPENSSL_SSL_LIBS="-lssl"
		],
		[],
		[-lcrypto]
	)]
)

if test "${have_openssl_crypto}" = "yes"; then
	saved_CFLAGS="${CFLAGS}"
	saved_LIBS="${LIBS}"
	CFLAGS="${CFLAGS} ${OPENSSL_CRYPTO_CFLAGS}"
	LIBS="${LIBS} ${OPENSSL_CRYPTO_LIBS}"
	AC_CHECK_FUNCS([EVP_CIPHER_CTX_set_key_length])
	have_openssl_engine="yes"
	AC_CHECK_FUNCS(
		[ \
			ENGINE_load_builtin_engines \
			ENGINE_register_all_complete \
			ENGINE_cleanup \
		],
		,
		[have_openssl_engine="no"; break]
	)

	CFLAGS="${saved_CFLAGS}"
	LIBS="${saved_LIBS}"
fi

AC_ARG_VAR([POLARSSL_CFLAGS], [C compiler flags for polarssl])
AC_ARG_VAR([POLARSSL_LIBS], [linker flags for polarssl])
have_polarssl_ssl="yes"
have_polarssl_crypto="yes"
if test -z "${POLARSSL_LIBS}"; then
	AC_CHECK_LIB(
		[polarssl],
		[ssl_init],
		[POLARSSL_LIBS="-lpolarssl"],
		[
			have_polarssl_ssl="no"
			AC_CHECK_LIB(
				[polarssl],
				[aes_crypt_cbc],
				,
				[have_polarssl_crypto="no"],
				[${PKCS11_HELPER_LIBS}]
			)
		],
		[${PKCS11_HELPER_LIBS}]
	)
fi

if test "${with_crypto_library}" = "polarssl" ; then
	AC_MSG_CHECKING([polarssl version])
	old_CFLAGS="${CFLAGS}"
	CFLAGS="${POLARSSL_CFLAGS} ${CFLAGS}"
	AC_COMPILE_IFELSE(
		[AC_LANG_PROGRAM(
			[[
#include <polarssl/version.h>
			]],
			[[
#if POLARSSL_VERSION_NUMBER < 0x01030800 || POLARSSL_VERSION_NUMBER >= 0x01040000
#error invalid version
#endif
			]]
		)],
		[AC_MSG_RESULT([ok])],
		[AC_MSG_ERROR([PolarSSL 1.3.x required and must be 1.3.8 or later])]
	)

	polarssl_with_pkcs11="no"
	AC_COMPILE_IFELSE(
		[AC_LANG_PROGRAM(
			[[
#include <polarssl/config.h>
			]],
			[[
#ifndef POLARSSL_PKCS11_C
#error pkcs11 wrapper missing
#endif
			]]
		)],
		polarssl_with_pkcs11="yes")
	CFLAGS="${old_CFLAGS}"

	AC_MSG_CHECKING([polarssl pkcs11 support])
	if test "${enable_pkcs11}" = "yes"; then
		if test "${polarssl_with_pkcs11}" = "yes"; then
			AC_MSG_RESULT([ok])
		else
			AC_MSG_ERROR([polarssl has no pkcs11 wrapper compiled in])
		fi
	else
		if test "${polarssl_with_pkcs11}" != "yes"; then
			AC_MSG_RESULT([ok])
		else
			AC_MSG_ERROR([PolarSSL compiled with PKCS11, while OpenVPN is not])
		fi
	fi

fi

AC_ARG_VAR([LZO_CFLAGS], [C compiler flags for lzo])
AC_ARG_VAR([LZO_LIBS], [linker flags for lzo])
have_lzo="yes"
if test -z "${LZO_LIBS}"; then
	AC_CHECK_LIB(
		[lzo2],
		[lzo1x_1_15_compress],
		[LZO_LIBS="-llzo2"],
		[AC_CHECK_LIB(
			[lzo],
			[lzo1x_1_15_compress],
			[LZO_LIBS="-llzo"],
			[have_lzo="no"]
		)]
	)
fi
if test "${have_lzo}" = "yes"; then
	saved_CFLAGS="${CFLAGS}"
	CFLAGS="${CFLAGS} ${LZO_CFLAGS}"
	AC_CHECK_HEADERS(
		[lzo/lzoutil.h],
		,
		[AC_CHECK_HEADERS(
			[lzoutil.h],
			,
			[AC_MSG_ERROR([lzoutil.h is missing])]
		)]
	)
	AC_CHECK_HEADERS(
		[lzo/lzo1x.h],
		,
		[AC_CHECK_HEADERS(
			[lzo1x.h],
			,
			[AC_MSG_ERROR([lzo1x.h is missing])]
		)]
	)
	CFLAGS="${saved_CFLAGS}"
fi


dnl
dnl Check for systemd
dnl

if test "$enable_systemd" = "yes" ; then
    PKG_CHECK_MODULES([libsystemd], [systemd libsystemd],
                      [],
                      [PKG_CHECK_MODULES([libsystemd], [libsystemd-daemon])]
                      )
    AC_CHECK_HEADERS(systemd/sd-daemon.h,
       ,
       [
	   AC_MSG_ERROR([systemd development headers not found.])
       ])

    saved_LIBS="${LIBS}"
    LIBS="${LIBS} ${libsystemd_LIBS}"
    AC_CHECK_FUNCS([sd_booted], [], [AC_MSG_ERROR([systemd library is missing sd_booted()])])
    OPTIONAL_SYSTEMD_LIBS="${libsystemd_LIBS}"
    AC_DEFINE(ENABLE_SYSTEMD, 1, [Enable systemd integration])
    LIBS="${saved_LIBS}"
fi


AC_MSG_CHECKING([git checkout])
GIT_CHECKOUT="no"
if test -n "${GIT}" -a -d "${srcdir}/.git"; then
	AC_DEFINE([HAVE_CONFIG_VERSION_H], [1], [extra version available in config-version.h])
	GIT_CHECKOUT="yes"
fi
AC_MSG_RESULT([${GIT_CHECKOUT}])

if test -n "${SP_PLATFORM_WINDOWS}"; then
	AC_DEFINE_UNQUOTED([PATH_SEPARATOR], ['\\\\'], [Path separator]) #"
	AC_DEFINE_UNQUOTED([PATH_SEPARATOR_STR], ["\\\\"], [Path separator]) #"
else
	AC_DEFINE_UNQUOTED([PATH_SEPARATOR], ['/'], [Path separator])
	AC_DEFINE_UNQUOTED([PATH_SEPARATOR_STR], ["/"], [Path separator])
fi

dnl enable --x509-username-field feature if requested
if test "${enable_x509_alt_username}" = "yes"; then
	if test "${with_crypto_library}" = "polarssl" ; then
		AC_MSG_ERROR([PolarSSL does not support the --x509-username-field feature])
	fi

	AC_DEFINE([ENABLE_X509ALTUSERNAME], [1], [Enable --x509-username-field feature])
fi

test "${ac_cv_header_sys_uio_h}" = "yes" && AC_DEFINE([HAVE_IOVEC], [1], [struct iovec needed for IPv6 support])
test "${enable_multi}" = "yes" && AC_DEFINE([ENABLE_CLIENT_SERVER], [1], [Enable client/server capability])
test "${enable_server}" = "no" && AC_DEFINE([ENABLE_CLIENT_ONLY], [1], [Enable client capability only])
test "${enable_management}" = "yes" && AC_DEFINE([ENABLE_MANAGEMENT], [1], [Enable management server capability])
test "${enable_socks}" = "yes" && AC_DEFINE([ENABLE_SOCKS], [1], [Enable Socks proxy support])
test "${enable_http_proxy}" = "yes" && AC_DEFINE([ENABLE_HTTP_PROXY], [1], [Enable HTTP proxy support])
test "${enable_multihome}" = "yes" && AC_DEFINE([ENABLE_MULTIHOME], [1], [Enable multi-homed UDP server capability])
test "${enable_debug}" = "yes" && AC_DEFINE([ENABLE_DEBUG], [1], [Enable debugging support])
test "${enable_small}" = "yes" && AC_DEFINE([ENABLE_SMALL], [1], [Enable smaller executable size])
test "${enable_fragment}" = "yes" && AC_DEFINE([ENABLE_FRAGMENT], [1], [Enable internal fragmentation support])
test "${enable_port_share}" = "yes" && AC_DEFINE([ENABLE_PORT_SHARE], [1], [Enable TCP Server port sharing])
test "${enable_def_auth}" = "yes" && AC_DEFINE([ENABLE_DEF_AUTH], [1], [Enable deferred authentication])
test "${enable_pf}" = "yes" && AC_DEFINE([ENABLE_PF], [1], [Enable internal packet filter])
test "${enable_strict_options}" = "yes" && AC_DEFINE([ENABLE_STRICT_OPTIONS_CHECK], [1], [Enable strict options check between peers])

case "${with_crypto_library}" in
	openssl)
		have_crypto_crypto="${have_openssl_crypto}"
		have_crypto_ssl="${have_openssl_ssl}"
		CRYPTO_CRYPTO_CFLAGS="${OPENSSL_CRYPTO_CFLAGS}"
		CRYPTO_CRYPTO_LIBS="${OPENSSL_CRYPTO_LIBS}"
		CRYPTO_SSL_CFLAGS="${OPENSSL_SSL_CFLAGS}"
		CRYPTO_SSL_LIBS="${OPENSSL_SSL_LIBS}"
		AC_DEFINE([ENABLE_CRYPTO_OPENSSL], [1], [Use OpenSSL library])
		test "${have_openssl_engine}" = "yes" && AC_DEFINE([HAVE_OPENSSL_ENGINE], [1], [Use crypto library])
		;;
	polarssl)
		have_crypto_crypto="${have_polarssl_crypto}"
		have_crypto_ssl="${have_polarssl_ssl}"
		CRYPTO_CRYPTO_CFLAGS="${POLARSSL_CFLAGS}"
		CRYPTO_CRYPTO_LIBS="${POLARSSL_LIBS}"
		AC_DEFINE([ENABLE_CRYPTO_POLARSSL], [1], [Use PolarSSL library])
		;;
esac

if test "${enable_ssl}" = "yes"; then
	test "${enable_crypto}" != "yes" && AC_MSG_ERROR([crypto must be enabled for ssl])
	test "${have_crypto_ssl}" != "yes" && AC_MSG_ERROR([${with_ssl_library} ssl is required but missing])
	OPTIONAL_CRYPTO_CFLAGS="${OPTIONAL_CRYPTO_CFLAGS} ${CRYPTO_SSL_CFLAGS}"
	OPTIONAL_CRYPTO_LIBS="${OPTIONAL_CRYPTO_LIBS} ${CRYPTO_SSL_LIBS}"
	AC_DEFINE([ENABLE_SSL], [1], [Enable ssl library])
fi

if test "${enable_crypto}" = "yes"; then
	test "${have_crypto_crypto}" != "yes" && AC_MSG_ERROR([${with_crypto_library} crypto is required but missing])
	test "${enable_crypto_ofb_cfb}" = "yes" && AC_DEFINE([ENABLE_OFB_CFB_MODE], [1], [Enable OFB and CFB cipher modes])
	OPTIONAL_CRYPTO_CFLAGS="${OPTIONAL_CRYPTO_CFLAGS} ${CRYPTO_CRYPTO_CFLAGS}"
	OPTIONAL_CRYPTO_LIBS="${OPTIONAL_CRYPTO_LIBS} ${CRYPTO_CRYPTO_LIBS}"
	AC_DEFINE([ENABLE_CRYPTO], [1], [Enable crypto library])
fi

if test "${enable_plugins}" = "yes"; then
	OPTIONAL_DL_LIBS="${DL_LIBS}"
	AC_DEFINE([ENABLE_PLUGIN], [1], [Enable plug-in support])
else
	enable_plugin_auth_pam="no"
	enable_plugin_down_root="no"
fi

if test "${enable_iproute2}" = "yes"; then
	test -z "${IPROUTE}" && AC_MSG_ERROR([ip utility is required but missing])
	AC_DEFINE([ENABLE_IPROUTE], [1], [enable iproute2 support])
else
	if test "${WIN32}" != "yes"; then
		test -z "${ROUTE}" && AC_MSG_ERROR([route utility is required but missing])
		test -z "${IFCONFIG}" && AC_MSG_ERROR([ifconfig utility is required but missing])
	fi
fi

if test "${enable_selinux}" = "yes"; then
	test -z "${SELINUX_LIBS}" && AC_MSG_ERROR([libselinux required but missing])
	OPTIONAL_SELINUX_LIBS="${SELINUX_LIBS}"
	AC_DEFINE([ENABLE_SELINUX], [1], [SELinux support])
fi

if test "${enable_lzo}" = "yes"; then
	test "${have_lzo}" != "yes" && AC_MSG_ERROR([lzo enabled but missing])
	OPTIONAL_LZO_CFLAGS="${LZO_CFLAGS}"
	OPTIONAL_LZO_LIBS="${LZO_LIBS}"
	AC_DEFINE([ENABLE_LZO], [1], [Enable LZO compression library])
fi
if test "${enable_lzo_stub}" = "yes"; then
	test "${enable_lzo}" = "yes" && AC_MSG_ERROR([Cannot have both lzo stub and lzo enabled])
	AC_DEFINE([ENABLE_LZO_STUB], [1], [Enable LZO stub capability])
	AC_DEFINE([ENABLE_LZO], [1], [Enable LZO compression library])
fi

if test "${enable_pkcs11}" = "yes"; then
	test "${have_pkcs11_helper}" != "yes" && AC_MSG_ERROR([PKCS11 enabled but libpkcs11-helper is missing])
	test "${enable_ssl}" != "yes" && AC_MSG_ERROR([PKCS11 can be enabled only if SSL is enabled])
	OPTIONAL_PKCS11_HELPER_CFLAGS="${PKCS11_HELPER_CFLAGS}"
	OPTIONAL_PKCS11_HELPER_LIBS="${PKCS11_HELPER_LIBS}"
	AC_DEFINE([ENABLE_PKCS11], [1], [Enable PKCS11])
	PKG_CHECK_MODULES(
		[P11KIT],
		[p11-kit-1],
		[proxy_module="`$PKG_CONFIG --variable=proxy_module p11-kit-1`"
		 AC_DEFINE_UNQUOTED([DEFAULT_PKCS11_MODULE], "${proxy_module}", [p11-kit proxy])],
		[]
	)
fi

# Set -std=gnu89 unless user already specified a -std=
case "${CFLAGS}" in
  *-std=*) ;;
  *)       CFLAGS="${CFLAGS} -std=gnu89" ;;
esac

if test "${enable_pedantic}" = "yes"; then
	enable_strict="yes"
	CFLAGS="${CFLAGS} -pedantic"
	test "${WIN32}" != "yes" && CFLAGS="${CFLAGS} -ansi"
fi
if test "${enable_strict}" = "yes"; then
	CFLAGS="${CFLAGS} -Wall -Wno-unused-parameter -Wno-unused-function"
fi

if test "${WIN32}" = "yes"; then
	test -z "${MAN2HTML}" && AC_MSG_ERROR([man2html is required for win32])
fi

if test "${enable_plugin_auth_pam}" = "yes"; then
	PLUGIN_AUTH_PAM_CFLAGS="${LIBPAM_CFLAGS}"
	if test "${enable_pam_dlopen}" = "yes"; then
		AC_DEFINE([USE_PAM_DLOPEN], [1], [dlopen libpam])
		PLUGIN_AUTH_PAM_LIBS="${DL_LIBS}"
	else
		test -z "${LIBPAM_LIBS}" && AC_MSG_ERROR([libpam required but missing])
		PLUGIN_AUTH_PAM_LIBS="${LIBPAM_LIBS}"
	fi
fi

CONFIGURE_DEFINES="`set | grep '^enable_.*=' ; set | grep '^with_.*='`"
AC_DEFINE_UNQUOTED([CONFIGURE_DEFINES], ["`echo ${CONFIGURE_DEFINES}`"], [Configuration settings])

TAP_WIN_COMPONENT_ID="PRODUCT_TAP_WIN_COMPONENT_ID"
TAP_WIN_MIN_MAJOR="PRODUCT_TAP_WIN_MIN_MAJOR"
TAP_WIN_MIN_MINOR="PRODUCT_TAP_WIN_MIN_MINOR"
AC_DEFINE_UNQUOTED([TAP_WIN_COMPONENT_ID], ["${TAP_WIN_COMPONENT_ID}"], [The tap-windows id])
AC_DEFINE_UNQUOTED([TAP_WIN_MIN_MAJOR], [${TAP_WIN_MIN_MAJOR}], [The tap-windows version number is required for OpenVPN])
AC_DEFINE_UNQUOTED([TAP_WIN_MIN_MINOR], [${TAP_WIN_MIN_MINOR}], [The tap-windows version number is required for OpenVPN])
AC_SUBST([TAP_WIN_COMPONENT_ID])
AC_SUBST([TAP_WIN_MIN_MAJOR])
AC_SUBST([TAP_WIN_MIN_MINOR])

AC_SUBST([OPTIONAL_DL_LIBS])
AC_SUBST([OPTIONAL_SELINUX_LIBS])
AC_SUBST([OPTIONAL_CRYPTO_CFLAGS])
AC_SUBST([OPTIONAL_CRYPTO_LIBS])
AC_SUBST([OPTIONAL_LZO_CFLAGS])
AC_SUBST([OPTIONAL_LZO_LIBS])
AC_SUBST([OPTIONAL_SYSTEMD_LIBS])
AC_SUBST([OPTIONAL_PKCS11_HELPER_CFLAGS])
AC_SUBST([OPTIONAL_PKCS11_HELPER_LIBS])

AC_SUBST([PLUGIN_AUTH_PAM_CFLAGS])
AC_SUBST([PLUGIN_AUTH_PAM_LIBS])

AM_CONDITIONAL([WIN32], [test "${WIN32}" = "yes"])
AM_CONDITIONAL([GIT_CHECKOUT], [test "${GIT_CHECKOUT}" = "yes"])
AM_CONDITIONAL([ENABLE_PLUGIN_AUTH_PAM], [test "${enable_plugin_auth_pam}" = "yes"])
AM_CONDITIONAL([ENABLE_PLUGIN_DOWN_ROOT], [test "${enable_plugin_down_root}" = "yes"])
AM_CONDITIONAL([ENABLE_CRYPTO], [test "${enable_crypto}" = "yes"])

plugindir="${with_plugindir}"
sampledir="\$(docdir)/sample"
AC_SUBST([plugindir])
AC_SUBST([sampledir])

VENDOR_SRC_ROOT="\$(abs_top_srcdir)/vendor/"
VENDOR_DIST_ROOT="\$(abs_top_builddir)/vendor/dist"
VENDOR_BUILD_ROOT="\$(abs_top_builddir)/vendor/.build"
AC_SUBST([VENDOR_SRC_ROOT])
AC_SUBST([VENDOR_BUILD_ROOT])
AC_SUBST([VENDOR_DIST_ROOT])

TEST_LDFLAGS="-lcmocka -L\$(abs_top_builddir)/vendor/dist/lib -Wl,-rpath,\$(abs_top_builddir)/vendor/dist/lib"
TEST_CFLAGS="-I\$(top_srcdir)/include -I\$(abs_top_builddir)/vendor/dist/include"

AC_SUBST([TEST_LDFLAGS])
AC_SUBST([TEST_CFLAGS])

# Check if cmake is available and cmocka git submodule is initialized,
# needed for unit testing
AC_CHECK_PROGS([CMAKE], [cmake])
if test -n "${CMAKE}"; then
   if test -f "${srcdir}/vendor/cmocka/CMakeLists.txt"; then
      AM_CONDITIONAL([CMOCKA_INITIALIZED], [true])
   else
      AM_CONDITIONAL([CMOCKA_INITIALIZED], [false])
      AC_MSG_RESULT([!! WARNING !! The cmoka git submodule has not been initialized or updated.  Unit testing cannot be performed.])
   fi
else
   AC_MSG_RESULT([!! WARNING !! CMake is NOT available.  Unit testing cannot be performed.])
   AM_CONDITIONAL([CMOCKA_INITIALIZED], [false])
fi


AC_CONFIG_FILES([
	version.sh
	Makefile
	build/Makefile
	build/msvc/Makefile
	build/msvc/msvc-generate/Makefile
	distro/Makefile
	distro/rpm/Makefile
	distro/rpm/openvpn.spec
	include/Makefile
	src/Makefile
	src/compat/Makefile
	src/openvpn/Makefile
	src/openvpnserv/Makefile
	src/plugins/Makefile
	src/plugins/auth-pam/Makefile
	src/plugins/down-root/Makefile
	tests/Makefile
        tests/unit_tests/Makefile
        tests/unit_tests/openvpn/Makefile
        tests/unit_tests/plugins/Makefile
        tests/unit_tests/plugins/auth-pam/Makefile
        tests/unit_tests/example_test/Makefile
        vendor/Makefile
	sample/Makefile
	doc/Makefile
])
AC_CONFIG_FILES([tests/t_client.sh], [chmod +x tests/t_client.sh])
AC_OUTPUT