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# Copyright (C) 2004-2013  Internet Systems Consortium, Inc. ("ISC")
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# Copyright (C) 1998-2003  Internet Software Consortium.
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
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dnl
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AC_DIVERT_PUSH(1)dnl
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esyscmd([sed "s/^/# /" COPYRIGHT])dnl
AC_DIVERT_POP()dnl
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AC_REVISION($Revision: 1.533.34.1 $)
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AC_INIT(lib/dns/name.c)
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AC_PREREQ(2.59)
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AC_CONFIG_HEADER(config.h)
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AC_CONFIG_MACRO_DIR([libtool.m4])
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AC_CANONICAL_HOST

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AC_PROG_MAKE_SET
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#
# GNU libtool support
#
case $build_os in
sunos*)
    # Just set the maximum command line length for sunos as it otherwise
    # takes a exceptionally long time to work it out. Required for libtool.
     
    lt_cv_sys_max_cmd_len=4096;
    ;;
esac

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AC_PROG_LIBTOOL
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AC_PROG_INSTALL
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AC_PROG_LN_S
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AC_SUBST(STD_CINCLUDES)
AC_SUBST(STD_CDEFINES)
AC_SUBST(STD_CWARNINGS)
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AC_SUBST(CCOPT)
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# Warn if the user specified libbind, which is now deprecated
AC_ARG_ENABLE(libbind, [  --enable-libbind	  deprecated])

case "$enable_libbind" in
	yes)
		AC_MSG_ERROR(['libbind' is no longer part of the BIND 9 distribution.
It is available from http://www.isc.org as a separate download.])
		;;
	no|'')
		;;
esac

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AC_ARG_ENABLE(developer, [  --enable-developer      enable developer build settings])
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case "$enable_developer" in
yes)
	test "${enable_fixed_rrset+set}" = set || enable_fixed_rrset=yes
	test "${with_atf+set}" = set || with_atf=yes
	test "${enable_filter_aaaa+set}" = set || enable_filter_aaaa=yes
	test "${enable_rpz_nsip+set}" = set || enable_rpz_nsip=yes
	test "${enable_rpz_nsdname+set}" = set || enable_rpz_nsdname=yes
	test "${with_dlz_filesystem+set}" = set || with_dlz_filesystem=yes
	case "$host" in
	*-darwin*)
		test "${enable_exportlib+set}" = set || enable_exportlib=yes
		;;
	*-linux*)
		test "${enable_exportlib+set}" = set || enable_exportlib=yes
		;;
	esac
	;;
esac
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#
# Make very sure that these are the first files processed by
# config.status, since we use the processed output as the input for
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# AC_SUBST_FILE() substitutions in other files.
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#
AC_CONFIG_FILES([make/rules make/includes])

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AC_PATH_PROG(AR, ar)
ARFLAGS="cruv"
AC_SUBST(AR)
AC_SUBST(ARFLAGS)

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# The POSIX ln(1) program.  Non-POSIX systems may substitute
# "copy" or something.
LN=ln
AC_SUBST(LN)

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case "$AR" in
	"")
		AC_MSG_ERROR([
ar program not found.  Please fix your PATH to include the directory in
which ar resides, or set AR in the environment with the full path to ar.
])

		;;
esac

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#
# Etags.
#
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AC_PATH_PROGS(ETAGS, etags emacs-etags)
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#
# Some systems, e.g. RH7, have the Exuberant Ctags etags instead of
# GNU emacs etags, and it requires the -L flag.
#
if test "X$ETAGS" != "X"; then
	AC_MSG_CHECKING(for Exuberant Ctags etags)
	if $ETAGS --version 2>&1 | grep 'Exuberant Ctags' >/dev/null 2>&1; then
		AC_MSG_RESULT(yes)
		ETAGS="$ETAGS -L"
	else
		AC_MSG_RESULT(no)
	fi
fi
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AC_SUBST(ETAGS)

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#
# Perl is optional; it is used only by some of the system test scripts.
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# Note: the backtrace feature (see below) uses perl to build the symbol table,
# but it still compiles without perl, in which case an empty table will be used.
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#
AC_PATH_PROGS(PERL, perl5 perl)
AC_SUBST(PERL)

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#
# Python is also optional; it is used by the tools in bin/python.
# If python is unavailable, we simply don't build those.
#
AC_ARG_WITH(python,
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[  --with-python=PATH      Specify path to python interpreter],
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    use_python="$withval", use_python="unspec")

case "$use_python" in
	no)
		AC_MSG_RESULT(disabled)
		;;
	unspec|yes|*)
		case "$use_python" in
		unspec|yes|'')
			AC_PATH_PROGS(PYTHON, python)
			;;
		*)
			AC_PATH_PROGS(PYTHON, $use_python)
			;;
		esac
		if test "X$PYTHON" == "X"
		then
			case "$use_python" in
			unspec)
				AC_MSG_RESULT(disabled)
				;;
			yes|*)
				AC_MSG_ERROR([missing python])
				;;
			esac
			break
		fi
                testscript='try: import argparse
except: exit(1)'
		AC_MSG_CHECKING([python module 'argparse'])
                if $PYTHON -c "$testscript"; then
                        AC_MSG_RESULT([found, using $PYTHON])
                else
			case "$use_python" in
			unspec)
				PYTHON=""
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				AC_SUBST(CHECKDS)
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				AC_MSG_RESULT([not found, python disabled])
				;;
			yes)
                        AC_MSG_RESULT([no found])
                        AC_MSG_ERROR([python 'argparse' module not supported])
				;;
			esac
                fi
		;;
esac

PYTHON_TOOLS=''
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CHECKDS=''
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if test "X$PYTHON" != "X"; then
        PYTHON_TOOLS=python
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	CHECKDS=checkds
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fi
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AC_SUBST(CHECKDS)
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AC_SUBST(PYTHON_TOOLS)

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#
# Special processing of paths depending on whether --prefix,
# --sysconfdir or --localstatedir arguments were given.  What's
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# desired is some compatibility with the way previous versions
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# of BIND built; they defaulted to /usr/local for most parts of
# the installation, but named.boot/named.conf was in /etc
# and named.pid was in /var/run.
#
# So ... if none of --prefix, --sysconfdir or --localstatedir are
# specified, set things up that way.  If --prefix is given, use
# it for sysconfdir and localstatedir the way configure normally
# would.  To change the prefix for everything but leave named.conf
# in /etc or named.pid in /var/run, then do this the usual configure way:
# ./configure --prefix=/somewhere --sysconfdir=/etc
# ./configure --prefix=/somewhere --localstatedir=/var
#
# To put named.conf and named.pid in /usr/local with everything else,
# set the prefix explicitly to /usr/local even though that's the default:
# ./configure --prefix=/usr/local
#
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case "$prefix" in
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	NONE)
		case "$sysconfdir" in
			'${prefix}/etc')
				sysconfdir=/etc
				;;
		esac
		case "$localstatedir" in
			'${prefix}/var')
				localstatedir=/var
				;;
		esac
		;;
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esac

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#
# Make sure INSTALL uses an absolute path, else it will be wrong in all
# Makefiles, since they use make/rules.in and INSTALL will be adjusted by
# configure based on the location of the file where it is substituted.
# Since in BIND9 INSTALL is only substituted into make/rules.in, an immediate
# subdirectory of install-sh, This relative path will be wrong for all
# directories more than one level down from install-sh.
#
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case "$INSTALL" in
	/*)
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		;;
	*)
		#
		# Not all systems have dirname.
		#
		changequote({, })
		ac_dir="`echo $INSTALL | sed 's%/[^/]*$%%'`"
		changequote([, ])

		ac_prog="`echo $INSTALL | sed 's%.*/%%'`"
		test "$ac_dir" = "$ac_prog" && ac_dir=.
		test -d "$ac_dir" && ac_dir="`(cd \"$ac_dir\" && pwd)`"
		INSTALL="$ac_dir/$ac_prog"
		;;
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esac

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#
# On these hosts, we really want to use cc, not gcc, even if it is
# found.  The gcc that these systems have will not correctly handle
# pthreads.
#
# However, if the user sets $CC to be something, let that override
# our change.
#
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if test "X$CC" = "X" ; then
	case "$host" in
		*-dec-osf*)
			CC="cc"
			;;
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		*-solaris*)
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			# Use Sun's cc if it is available, but watch
			# out for /usr/ucb/cc; it will never be the right
			# compiler to use.
			#
			# If setting CC here fails, the AC_PROG_CC done
			# below might still find gcc.
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			IFS="${IFS=	}"; ac_save_ifs="$IFS"; IFS=":"
			for ac_dir in $PATH; do
				test -z "$ac_dir" && ac_dir=.
				case "$ac_dir" in
				/usr/ucb)
					# exclude
					;;
				*)
					if test -f "$ac_dir/cc"; then
						CC="$ac_dir/cc"
						break
					fi
					;;
				esac
			done
			IFS="$ac_save_ifs"
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			;;
		*-hp-hpux*)
			CC="cc"
			;;
		mips-sgi-irix*)
			CC="cc"
			;;
	esac
fi

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AC_PROG_CC

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#
# gcc's optimiser is broken at -02 for ultrasparc
#
if test "$ac_env_CFLAGS_set" != set -a "X$GCC" = "Xyes"; then
	case "$host" in
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	sparc-*)
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		CCFLAGS="-g -O1"
		;;
	esac
fi

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#
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# OS dependent CC flags
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#
case "$host" in
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	# OSF 5.0: recv/send are only available with -D_POSIX_PII_SOCKET or
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	# -D_XOPEN_SOURCE_EXTENDED.
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	*-dec-osf*)
		STD_CDEFINES="$STD_CDEFINES -D_POSIX_PII_SOCKET"
		CPPFLAGS="$CPPFLAGS -D_POSIX_PII_SOCKET"
		;;
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	#HP-UX: need -D_XOPEN_SOURCE_EXTENDED and -lxnet for CMSG macros
	*-hp-hpux*)
		STD_CDEFINES="$STD_CDEFINES -D_XOPEN_SOURCE_EXTENDED"
		CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE_EXTENDED"
		LIBS="-lxnet $LIBS"
		;;
	# Solaris: need -D_XPG4_2 and -D__EXTENSIONS__ for CMSG macros
	*-solaris*)
		STD_CDEFINES="$STD_CDEFINES -D_XPG4_2 -D__EXTENSIONS__"
		CPPFLAGS="$CPPFLAGS -D_XPG4_2 -D__EXTENSIONS__"
		;;
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	# POSIX doesn't include the IPv6 Advanced Socket API and glibc hides
	# parts of the IPv6 Advanced Socket API as a result.  This is stupid
	# as it breaks how the two halves (Basic and Advanced) of the IPv6
	# Socket API were designed to be used but we have to live with it.
	# Define _GNU_SOURCE to pull in the IPv6 Advanced Socket API.
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	*-linux* | *-kfreebsd*-gnu)
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		STD_CDEFINES="$STD_CDEFINES -D_GNU_SOURCE"
		CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
		;;
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	#
	# Starting with OSX 10.7 (Lion) we must choose which IPv6 API to use.
	# Setting this is sufficient to select the correct behavior for BIND 9.
	#
	*-darwin*)
	  STD_CDEFINES="$STD_CDEFINES -D__APPLE_USE_RFC_3542"
	  CPPFLAGS="$CPPFLAGS -D__APPLE_USE_RFC_3542"
	  ;;
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esac

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AC_HEADER_STDC

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AC_CHECK_HEADERS(fcntl.h regex.h sys/time.h unistd.h sys/mman.h sys/sockio.h sys/select.h sys/param.h sys/sysctl.h net/if6.h,,,
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[$ac_includes_default
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
])
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AC_C_CONST
AC_C_INLINE
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AC_C_VOLATILE
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AC_CHECK_FUNC(sysctlbyname, AC_DEFINE(HAVE_SYSCTLBYNAME))
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AC_C_FLEXIBLE_ARRAY_MEMBER
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#
# Check for the existence of mmap to enable the fast format zones
#
AC_CHECK_FUNCS(mmap)

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#
# Older versions of HP/UX don't define seteuid() and setegid()
#
AC_CHECK_FUNCS(seteuid setresuid)
AC_CHECK_FUNCS(setegid setresgid)

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#
# UnixWare 7.1.1 with the feature supplement to the UDK compiler
# is reported to not support "static inline" (RT #1212).
#
AC_MSG_CHECKING(for static inline breakage)
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AC_TRY_COMPILE([
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	static inline int foo1() {
		return 0;
	}

	static inline int foo2() {
		return foo1();
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	}
	], [foo1();],
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	[AC_MSG_RESULT(no)],
	[AC_MSG_RESULT(yes)
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	 AC_DEFINE(inline, ,[Define to empty if your compiler does not support "static inline".])])
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AC_TYPE_SIZE_T
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AC_CHECK_TYPE(ssize_t, int)
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AC_CHECK_TYPE(uintptr_t,unsigned long)
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AC_CHECK_TYPE(socklen_t,
[AC_DEFINE(ISC_SOCKADDR_LEN_T, socklen_t)],
[
AC_TRY_COMPILE(
[
#include <sys/types.h>
#include <sys/socket.h>
int getsockname(int, struct sockaddr *, size_t *);
],[],
[AC_DEFINE(ISC_SOCKADDR_LEN_T, size_t)],
[AC_DEFINE(ISC_SOCKADDR_LEN_T, int)])
],
[
#include <sys/types.h>
#include <sys/socket.h>
])
AC_SUBST(ISC_SOCKADDR_LEN_T)
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AC_HEADER_TIME
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AC_MSG_CHECKING(for long long)
AC_TRY_COMPILE([],[long long i = 0; return (0);],
	[AC_MSG_RESULT(yes)
		ISC_PLATFORM_HAVELONGLONG="#define ISC_PLATFORM_HAVELONGLONG 1"],
	[AC_MSG_RESULT(no)
		ISC_PLATFORM_HAVELONGLONG="#undef ISC_PLATFORM_HAVELONGLONG"])
AC_SUBST(ISC_PLATFORM_HAVELONGLONG)
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#
# check for GCC noreturn attribute
#
AC_MSG_CHECKING(for GCC noreturn attribute)
AC_TRY_COMPILE([],[void foo() __attribute__((noreturn));],
	[AC_MSG_RESULT(yes)
		ISC_PLATFORM_NORETURN_PRE="#define ISC_PLATFORM_NORETURN_PRE"
		ISC_PLATFORM_NORETURN_POST="#define ISC_PLATFORM_NORETURN_POST __attribute__((noreturn))"],
	[AC_MSG_RESULT(no)
		ISC_PLATFORM_NORETURN_PRE="#define ISC_PLATFORM_NORETURN_PRE"
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		ISC_PLATFORM_NORETURN_POST="#define ISC_PLATFORM_NORETURN_POST"])
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AC_SUBST(ISC_PLATFORM_NORETURN_PRE)
AC_SUBST(ISC_PLATFORM_NORETURN_POST)

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#
# check if we have lifconf
#
AC_MSG_CHECKING(for struct lifconf)
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
],
[
struct lifconf lifconf;
lifconf.lifc_len = 0;
]
,
	[AC_MSG_RESULT(yes)
		ISC_PLATFORM_HAVELIFCONF="#define ISC_PLATFORM_HAVELIFCONF 1"],
	[AC_MSG_RESULT(no)
		ISC_PLATFORM_HAVELIFCONF="#undef ISC_PLATFORM_HAVELIFCONF"])
AC_SUBST(ISC_PLATFORM_HAVELIFCONF)

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#
# check if we have kqueue
#
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AC_ARG_ENABLE(kqueue,
	[  --enable-kqueue         use BSD kqueue when available [[default=yes]]],
	      want_kqueue="$enableval",  want_kqueue="yes")
case $want_kqueue in
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yes)
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	AC_CHECK_FUNC(kqueue, ac_cv_have_kqueue=yes, ac_cv_have_kqueue=no)
	case $ac_cv_have_kqueue in
	yes)
		ISC_PLATFORM_HAVEKQUEUE="#define ISC_PLATFORM_HAVEKQUEUE 1"
		;;
	*)
		ISC_PLATFORM_HAVEKQUEUE="#undef ISC_PLATFORM_HAVEKQUEUE"
		;;
	esac
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	;;
*)
	ISC_PLATFORM_HAVEKQUEUE="#undef ISC_PLATFORM_HAVEKQUEUE"
	;;
esac
AC_SUBST(ISC_PLATFORM_HAVEKQUEUE)

#
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# check if we have epoll.  Linux kernel 2.4 has epoll_create() which fails,
# so we need to try running the code, not just test its existence.
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#
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AC_ARG_ENABLE(epoll,
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[  --enable-epoll          use Linux epoll when available [[default=auto]]],
	      want_epoll="$enableval",  want_epoll="auto")
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case $want_epoll in
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auto)
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	AC_MSG_CHECKING(epoll support)
	AC_TRY_RUN([
#include <sys/epoll.h>
int main() {
	if (epoll_create(1) < 0)
		return (1);
	return (0);
}
],
	[AC_MSG_RESULT(yes)
	ISC_PLATFORM_HAVEEPOLL="#define ISC_PLATFORM_HAVEEPOLL 1"],
	[AC_MSG_RESULT(no)
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	ISC_PLATFORM_HAVEEPOLL="#undef ISC_PLATFORM_HAVEEPOLL"],
	[AC_MSG_RESULT(no)
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	ISC_PLATFORM_HAVEEPOLL="#undef ISC_PLATFORM_HAVEEPOLL"])
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	;;
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yes)
	ISC_PLATFORM_HAVEEPOLL="#define ISC_PLATFORM_HAVEEPOLL 1"
	;;
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*)
	ISC_PLATFORM_HAVEEPOLL="#undef ISC_PLATFORM_HAVEEPOLL"
	;;
esac
AC_SUBST(ISC_PLATFORM_HAVEEPOLL)

#
# check if we support /dev/poll
#
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AC_ARG_ENABLE(devpoll,
	[  --enable-devpoll        use /dev/poll when available [[default=yes]]],
	      want_devpoll="$enableval",  want_devpoll="yes")
case $want_devpoll in
yes)
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	AC_CHECK_HEADERS(sys/devpoll.h devpoll.h,
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	ISC_PLATFORM_HAVEDEVPOLL="#define ISC_PLATFORM_HAVEDEVPOLL 1"
	,
	ISC_PLATFORM_HAVEDEVPOLL="#undef ISC_PLATFORM_HAVEDEVPOLL"
	)
	;;
*)
	ISC_PLATFORM_HAVEDEVPOLL="#undef ISC_PLATFORM_HAVEDEVPOLL"
	;;
esac
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AC_SUBST(ISC_PLATFORM_HAVEDEVPOLL)
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#
# check if we need to #include sys/select.h explicitly
#
case $ac_cv_header_unistd_h in
yes)
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AC_MSG_CHECKING(if unistd.h or sys/types.h defines fd_set)
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AC_TRY_COMPILE([
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#include <sys/types.h> /* Ultrix */
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#include <unistd.h>],
[fd_set read_set; return (0);],
	[AC_MSG_RESULT(yes)
	 ISC_PLATFORM_NEEDSYSSELECTH="#undef ISC_PLATFORM_NEEDSYSSELECTH"
	 LWRES_PLATFORM_NEEDSYSSELECTH="#undef LWRES_PLATFORM_NEEDSYSSELECTH"],
	[AC_MSG_RESULT(no)
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	case $ac_cv_header_sys_select_h in
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	yes)
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	 ISC_PLATFORM_NEEDSYSSELECTH="#define ISC_PLATFORM_NEEDSYSSELECTH 1"
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	 LWRES_PLATFORM_NEEDSYSSELECTH="#define LWRES_PLATFORM_NEEDSYSSELECTH 1"
		;;
	no)
		AC_MSG_ERROR([need either working unistd.h or sys/select.h])
		;;
	esac
	])
	;;
no)
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	case $ac_cv_header_sys_select_h in
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	yes)
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	     ISC_PLATFORM_NEEDSYSSELECTH="#define ISC_PLATFORM_NEEDSYSSELECTH 1"
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	     LWRES_PLATFORM_NEEDSYSSELECTH="#define LWRES_PLATFORM_NEEDSYSSELECTH 1"
		;;
	no)
		AC_MSG_ERROR([need either unistd.h or sys/select.h])
		;;
	esac
	;;
esac
AC_SUBST(ISC_PLATFORM_NEEDSYSSELECTH)
AC_SUBST(LWRES_PLATFORM_NEEDSYSSELECTH)

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#
# Find the machine's endian flavor.
#
AC_C_BIGENDIAN

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#
# was --with-openssl specified?
#
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OPENSSL_WARNING=
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AC_MSG_CHECKING(for OpenSSL library)
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AC_ARG_WITH(openssl,
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[  --with-openssl[=PATH]     Build with OpenSSL [yes|no|path].
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			  (Required for DNSSEC)],
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    use_openssl="$withval", use_openssl="auto")
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openssldirs="/usr /usr/local /usr/local/ssl /usr/pkg /usr/sfw"
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if test "$use_openssl" = "auto"
then
	for d in $openssldirs
	do
		if test -f $d/include/openssl/opensslv.h
		then
			use_openssl=$d
			break
		fi
	done
fi
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OPENSSL_ECDSA=""
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OPENSSL_GOST=""
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case "$use_openssl" in
	no)
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		AC_MSG_RESULT(no)
		DST_OPENSSL_INC=""
		USE_OPENSSL=""
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		OPENSSLLINKOBJS=""
		OPENSSLLINKSRCS=""
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		;;
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	auto)
		DST_OPENSSL_INC=""
		USE_OPENSSL=""
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		OPENSSLLINKOBJS=""
		OPENSSLLINKSRCS=""
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		AC_MSG_ERROR(
[OpenSSL was not found in any of $openssldirs; use --with-openssl=/path
If you don't want OpenSSL, use --without-openssl])
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		;;
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	*)
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		if test "$use_openssl" = "yes"
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		then
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			# User did not specify a path - guess it
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			for d in $openssldirs
			do
				if test -f $d/include/openssl/opensslv.h
				then
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					use_openssl=$d
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					break
				fi
			done
			if test "$use_openssl" = "yes"
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			then
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				AC_MSG_RESULT(not found)
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				AC_MSG_ERROR(
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[OpenSSL was not found in any of $openssldirs; use --with-openssl=/path])
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			fi
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		elif ! test -f "$use_openssl"/include/openssl/opensslv.h
		then
			AC_MSG_ERROR(["$use_openssl/include/openssl/opensslv.h" not found])
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		fi
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		USE_OPENSSL='-DOPENSSL'
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		if test "$use_openssl" = "/usr"
		then
			DST_OPENSSL_INC=""
			DNS_OPENSSL_LIBS="-lcrypto"
		else
			DST_OPENSSL_INC="-I$use_openssl/include"
			case $host in
			*-solaris*)
				DNS_OPENSSL_LIBS="-L$use_openssl/lib -R$use_openssl/lib -lcrypto"
				;;
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			*-hp-hpux*)
				DNS_OPENSSL_LIBS="-L$use_openssl/lib -Wl,+b: -lcrypto"
				;;
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			*-apple-darwin*)
				#
				# Apple's ld seaches for serially for dynamic
				# then static libraries.  This means you can't
				# use -L to override dynamic system libraries
				# with static ones when linking.  Instead
				# we specify a absolute path.
				#
				if test -f "$use_openssl/lib/libcrypto.dylib"
				then
					DNS_OPENSSL_LIBS="-L$use_openssl/lib -lcrypto"
				else
					DNS_OPENSSL_LIBS="$use_openssl/lib/libcrypto.a"
				fi
				;;
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			*)
				DNS_OPENSSL_LIBS="-L$use_openssl/lib -lcrypto"
				;;
			esac
		fi
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		AC_MSG_RESULT(using OpenSSL from $use_openssl/lib and $use_openssl/include)
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		saved_cflags="$CFLAGS"
		saved_libs="$LIBS"
		CFLAGS="$CFLAGS $DST_OPENSSL_INC"
		LIBS="$LIBS $DNS_OPENSSL_LIBS"
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		AC_MSG_CHECKING(whether linking with OpenSSL works)
		AC_TRY_RUN([
#include <openssl/err.h>
int main() {
	ERR_clear_error();
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	return (0);
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}
],
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		[AC_MSG_RESULT(yes)],
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		[AC_MSG_RESULT(no)
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		 AC_MSG_ERROR(Could not run test program using OpenSSL from
$use_openssl/lib and $use_openssl/include.
Please check the argument to --with-openssl and your
shared library configuration (e.g., LD_LIBRARY_PATH).)],
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		[AC_MSG_RESULT(assuming it does work on target platform)])
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		AC_MSG_CHECKING(whether linking with OpenSSL requires -ldl)
		AC_TRY_LINK([
#include <openssl/err.h>],
[ DSO_METHOD_dlfcn(); ],
		[AC_MSG_RESULT(no)],
		[LIBS="$LIBS -ldl"
		AC_TRY_LINK([
#include <openssl/err.h>
],[ DSO_METHOD_dlfcn(); ],
		[AC_MSG_RESULT(yes)
		DNS_OPENSSL_LIBS="$DNS_OPENSSL_LIBS -ldl"
		],
		 [AC_MSG_RESULT(unknown)
		 AC_MSG_ERROR(OpenSSL has unsupported dynamic loading)],
		[AC_MSG_RESULT(assuming it does work on target platform)])
		],
		[AC_MSG_RESULT(assuming it does work on target platform)]
		)
		 
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AC_ARG_ENABLE(openssl-version-check,
[AC_HELP_STRING([--enable-openssl-version-check],
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	[Check OpenSSL Version @<:@default=yes@:>@])])
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case "$enable_openssl_version_check" in
yes|'')
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		AC_MSG_CHECKING(OpenSSL library version)
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		AC_TRY_RUN([
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#include <stdio.h>
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#include <openssl/opensslv.h>
int main() {
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	if ((OPENSSL_VERSION_NUMBER >= 0x009070cfL &&
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	     OPENSSL_VERSION_NUMBER < 0x00908000L) ||
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	     OPENSSL_VERSION_NUMBER >= 0x0090804fL)
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		return (0);
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	printf("\n\nFound   OPENSSL_VERSION_NUMBER %#010x\n",
		OPENSSL_VERSION_NUMBER);
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	printf("Require OPENSSL_VERSION_NUMBER 0x009070cf or greater (0.9.7l)\n"
	       "Require OPENSSL_VERSION_NUMBER 0x0090804f or greater (0.9.8d)\n\n");
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	return (1);
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}
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		],
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		[AC_MSG_RESULT(ok)],
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		[AC_MSG_RESULT(not compatible)
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		 OPENSSL_WARNING=yes
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		],
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		[AC_MSG_RESULT(assuming target platform has compatible version)])
;;
no)
	AC_MSG_RESULT(Skipped OpenSSL version check)
;;
esac

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        AC_MSG_CHECKING(for OpenSSL DSA support)
        if test -f $use_openssl/include/openssl/dsa.h
        then
                AC_DEFINE(HAVE_OPENSSL_DSA)
                AC_MSG_RESULT(yes)
        else
                AC_MSG_RESULT(no)
        fi
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        AC_CHECK_FUNCS(EVP_sha256 EVP_sha384 EVP_sha512)
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        AC_MSG_CHECKING(for OpenSSL ECDSA support)
        have_ecdsa=""
        AC_TRY_RUN([
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#include <stdio.h>
#include <openssl/ecdsa.h>
#include <openssl/objects.h>
int main() {
	EC_KEY *ec256, *ec384;

#if !defined(HAVE_EVP_SHA256) || !defined(HAVE_EVP_SHA384)
	return (1);
#endif
	ec256 = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
	ec384 = EC_KEY_new_by_curve_name(NID_secp384r1);
	if (ec256 == NULL || ec384 == NULL)
		return (2);
	return (0);
}
],
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        [AC_MSG_RESULT(yes)
        have_ecdsa="yes"],
        [AC_MSG_RESULT(no)
        have_ecdsa="no"],
        [AC_MSG_RESULT(using --with-ecdsa)])
        AC_ARG_WITH(ecdsa, [  --with-ecdsa            OpenSSL ECDSA],
	            with_ecdsa="$withval", with_ecdsa="auto")
        case "$with_ecdsa" in
        yes)
            case "$have_ecdsa" in
            no)  AC_MSG_ERROR([ecdsa not supported]) ;;
            *)  have_ecdsa=yes ;;
            esac
            ;;
        no)
            have_ecdsa=no ;;
        *)
            case "$have_ecdsa" in
            yes|no) ;;
            *) AC_MSG_ERROR([need --with-ecdsa=[[yes or no]]]) ;;
            esac
            ;;
        esac
        case $have_ecdsa in
        yes)
                OPENSSL_ECDSA="yes"
                AC_DEFINE(HAVE_OPENSSL_ECDSA, 1,
                          [Define if your OpenSSL version supports ECDSA.])
                ;;
        *)
                ;;
        esac

        AC_MSG_CHECKING(for OpenSSL GOST support)
        have_gost=""
        AC_TRY_RUN([
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#include <openssl/conf.h>
#include <openssl/engine.h>
int main() {
#if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
	ENGINE *e;
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	EC_KEY *ek;
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	ek = NULL;
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	OPENSSL_config(NULL);

	e = ENGINE_by_id("gost");
	if (e == NULL)
		return (1);
	if (ENGINE_init(e) <= 0)
		return (1);
	return (0);
#else
	return (1);
#endif
}
],
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        [AC_MSG_RESULT(yes)
        have_gost="yes"],
        [AC_MSG_RESULT(no)
        have_gost="no"],
        [AC_MSG_RESULT(using --with-gost)])
        AC_ARG_WITH(gost, [  --with-gost             OpenSSL GOST],
                    with_gost="$withval", with_gost="auto")
        case "$with_gost" in
        yes)
            case "$have_gost" in
            no)  AC_MSG_ERROR([gost not supported]) ;;
            *)  have_gost=yes ;;
            esac
            ;;
        no)
            have_gost=no ;;
        *)
            case "$have_gost" in
            yes|no) ;;
            *) AC_MSG_ERROR([need --with-gost=[[yes or no]]]) ;;
            esac
            ;;
        esac
        case $have_gost in
        yes)
                OPENSSL_GOST="yes"
                AC_DEFINE(HAVE_OPENSSL_GOST, 1,
                          [Define if your OpenSSL version supports GOST.])
                ;;
        *)
                ;;
        esac
        CFLAGS="$saved_cflags"
        LIBS="$saved_libs"
        OPENSSLLINKOBJS='${OPENSSLLINKOBJS}'
        OPENSSLLINKSRCS='${OPENSSLLINKSRCS}'
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        ;;
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esac
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#
# This would include the system openssl path (and linker options to use
# it as needed) if it is found.
#

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AC_SUBST(USE_OPENSSL)
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AC_SUBST(DST_OPENSSL_INC)
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AC_SUBST(OPENSSLLINKOBJS)
AC_SUBST(OPENSSLLINKSRCS)
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AC_SUBST(OPENSSL_ECDSA)
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AC_SUBST(OPENSSL_GOST)
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DNS_CRYPTO_LIBS="$DNS_CRYPTO_LIBS $DNS_OPENSSL_LIBS"
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#
# Use OpenSSL for hash functions
#

AC_ARG_ENABLE(openssl-hash,
	[  --enable-openssl-hash   use OpenSSL for hash functions [[default=no]]],
	want_openssl_hash="$enableval", want_openssl_hash="no")
case $want_openssl_hash in
	yes)
		if test "$USE_OPENSSL" = ""
		then
			AC_MSG_ERROR([No OpenSSL for hash functions])
		fi
		ISC_PLATFORM_OPENSSLHASH="#define ISC_PLATFORM_OPENSSLHASH 1"
		ISC_OPENSSL_INC="$DST_OPENSSL_INC"
		;;
	no)
		ISC_PLATFORM_OPENSSLHASH="#undef ISC_PLATFORM_OPENSSLHASH"
		ISC_OPENSSL_INC=""
		;;
esac
AC_SUBST(ISC_PLATFORM_OPENSSLHASH)
AC_SUBST(ISC_OPENSSL_INC)

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#
# PKCS11 (aka crypto hardware) support
#
# This works only with the right OpenSSL with PKCS11 engine!
#

AC_MSG_CHECKING(for PKCS11 support)
AC_ARG_WITH(pkcs11,
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[  --with-pkcs11[=PATH]      Build with PKCS11 support [yes|no|path]
                          (PATH is for the PKCS11 provider)],
   use_pkcs11="$withval", use_pkcs11="no")
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case "$use_pkcs11" in
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	no|'')
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		AC_MSG_RESULT(disabled)
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		USE_PKCS11=''
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		PKCS11_TOOLS=''
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		;;
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	yes|*)
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		AC_MSG_RESULT(using OpenSSL with PKCS11 support)
		USE_PKCS11='-DUSE_PKCS11'
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		PKCS11_TOOLS=pkcs11
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		;;
esac
AC_SUBST(USE_PKCS11)
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AC_SUBST(PKCS11_TOOLS)
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AC_MSG_CHECKING(for PKCS11 tools)
case "$use_pkcs11" in
	no|yes|'')
		AC_MSG_RESULT(disabled)
		PKCS11_PROVIDER="undefined"
		;;
       *)
		AC_MSG_RESULT(PKCS11 provider is "$use_pkcs11")
		PKCS11_PROVIDER="$use_pkcs11"
		;;
esac
AC_SUBST(PKCS11_PROVIDER)

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AC_MSG_CHECKING(for GSSAPI library)
AC_ARG_WITH(gssapi,
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[  --with-gssapi=PATH      Specify path for system-supplied GSSAPI [[default=yes]]],
    use_gssapi="$withval", use_gssapi="yes")
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# gssapi is just the framework, we really require kerberos v5, so
# look for those headers (the gssapi headers must be there, too)
# The problem with this implementation is that it doesn't allow
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# for the specification of gssapi and krb5 headers in different locations,
# which probably ought to be fixed although fixing might raise the issue of
# trying to build with incompatible versions of gssapi and krb5.
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if test "$use_gssapi" = "yes"
then
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	# first, deal with the obvious
	if test \( -f /usr/include/kerberosv5/krb5.h -o \
		   -f /usr/include/krb5/krb5.h -o \
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		   -f /usr/include/krb5.h \)   -a \
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		\( -f /usr/include/gssapi.h -o \
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		   -f /usr/include/gssapi/gssapi.h \)
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	then
		use_gssapi=/usr
	else
	    krb5dirs="/usr/local /usr/local/krb5 /usr/local/kerberosv5 /usr/local/kerberos /usr/pkg /usr/krb5 /usr/kerberosv5 /usr/kerberos /usr"
	    for d in $krb5dirs
	    do
		if test -f $d/include/gssapi/gssapi_krb5.h -o \
		        -f $d/include/krb5.h
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		then
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			if test -f $d/include/gssapi/gssapi.h -o \
			        -f $d/include/gssapi.h
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			then
				use_gssapi=$d
				break