AC_INIT([tlsdate],[0.0.13],[jacob at appelbaum.net])
AC_CONFIG_AUX_DIR([config])
AC_CONFIG_MACRO_DIR([m4])

AC_CANONICAL_TARGET
AC_ARG_PROGRAM
AC_USE_SYSTEM_EXTENSIONS

AM_INIT_AUTOMAKE([-Wall -Werror -Wno-portability subdir-objects foreign tar-ustar])

AC_PREREQ([2.63])

AC_CONFIG_HEADERS([config.h:config.in])dnl Keep filename to 8.3 for MS-DOS.

PKG_PROG_PKG_CONFIG
LT_PREREQ([2.2])
LT_INIT
LT_LANG([C])
gl_VISIBILITY
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

CONFIG_EXTRA
AX_PLATFORM

dnl Here we should build a small program to fetch the build system time in a portable
dnl manner. We have no Win32 users, we can fix this if we ever find one that
dnl cares.
dnl
dnl In Debian GNU/Linux and other Debian GNU/* systems, we wish to make this a
dnl deterministic build process. There is only one part of the build process that
dnl is entropic and that is this COMPILE_DATE value. We want to check to see if
dnl COMPILE_DATE is defined by the debian/rules file and if it is - we want to use
dnl the value provided by the environment. If it isn't we'll use one that we
dnl generate here.
dnl
echo "checking for \$COMPILE_DATE in the environment..."
if test "${COMPILE_DATE+set}" = set; then
  echo "...we've found \$COMPILE_DATE in the environment."
  echo "...\$COMPILE_DATE is set to: $COMPILE_DATE"
else
  echo "...no \$COMPILE_DATE found in our build environment. Generating now..."
  COMPILE_DATE=`date +%s`
  echo "...\$COMPILE_DATE is set to: $COMPILE_DATE"
fi

AC_SUBST([COMPILE_DATE])
AC_DEFINE_UNQUOTED([RECENT_COMPILE_DATE],
                   [${COMPILE_DATE}L],
                   [Time in seconds since the Disco epoch at build time])

dnl Build up the directory we will use to install certs
TLSDATE_CA_ROOTS="${sysconfdir}/$PACKAGE_NAME/ca-roots"
AC_SUBST([TLSDATE_CA_ROOTS])

dnl Place we install our config file
TLSDATE_CONF_DIR="${sysconfdir}/$PACKAGE_NAME/"
AC_SUBST([TLSDATE_CONF_DIR])

dnl HTTPS User-agent
AC_ARG_WITH([https-user-agent],
	    [AS_HELP_STRING([--with-https-user-agent=AGENT],
	                    [a User-Agent value to send when running in HTTPS mode])],
	    [],
	    [with_https_user_agent="TLSDate/$VERSION"])
AC_DEFINE_UNQUOTED([HTTPS_USER_AGENT],
	           ["${with_https_user_agent}"],
		   [User-Agent value to send when running as an HTTPS client])

dnl check for PolarSSL
OPT_POLARSSL=yes

AC_MSG_CHECKING([PolarSSL])
AC_ARG_WITH([polarssl],
            [AS_HELP_STRING([--with-polarssl=DIR],
                            [where to look for PolarSSL, DIR points to the installation root])])

AS_CASE([$with_polarssl],
        [""|yes|no], [POLARSSL_DIR=""],
        [*], [POLARSSL_DIR=$with_polarssl])
OPT_POLARSSL=$with_polarssl

SSL_FLAGS=""
SSL_LDFLAGS=""
SSL_LIBS="-lssl -lcrypto"

AS_IF([test "x${OPT_POLARSSL}" != "xno"], [
  AS_IF([test -z "${POLARSSL_DIR}"], [
    dnl check for lib first without setting any new path
    AC_CHECK_LIB(polarssl, ssl_init,
    dnl libpolarssl found, set the variable
     [
       AC_DEFINE(USE_POLARSSL, 1, [if PolarSSL is enabled])
       AC_SUBST(USE_POLARSSL, [1])
       POLARSSL_ENABLED=1
       USE_POLARSSL="yes"
     ])
  ])

  addld=""
  addlib=""
  addcflags=""
  polarssllib=""

  AS_IF([test "x${USE_POLARSSL}" != "xyes"], [
    dnl add the path and test again
    addld=-L${POLARSSL_DIR}/lib$libsuff
    addcflags=-I${POLARSSL_DIR}/include
    polarssllib=${POLARSSL_DIR}/lib$libsuff

    LDFLAGS="$LDFLAGS $addld"
    AS_IF([test "$addcflags" != "-I/usr/include"], [
        AX_APPEND_COMPILE_FLAGS(["$addcflags"])
       CPPFLAGS="$CPPFLAGS $addcflags"
    ])

    AC_CHECK_LIB(polarssl, ssl_init,
     [
       AC_DEFINE(USE_POLARSSL, 1, [if PolarSSL is enabled])
       AC_SUBST(USE_POLARSSL, [1])
       POLARSSL_ENABLED=1
       USE_POLARSSL="yes"
       SSL_CFLAGS=$addcflags
       SSL_LDFLAGS=$addld
     ])
  ])

  AS_IF([test "x${USE_POLARSSL}" = "xyes"], [
    AC_MSG_NOTICE([detected PolarSSL])
    SSL_LIBS="-lpolarssl"

    AS_IF([test -n "$polarssllib"], [
      dnl when shared libs were found in a path that the run-time
      dnl linker doesn't search through, we need to add it to
      dnl LD_LIBRARY_PATH to prevent further configure tests to fail
      dnl due to this
      AS_IF([test "x$cross_compiling" != "xyes"], [
        LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$polarssllib"
        export LD_LIBRARY_PATH
        AC_MSG_NOTICE([Added $polarssllib to LD_LIBRARY_PATH])
      ])
    ])
  ])
])
AC_SUBST(SSL_CFLAGS)
AC_SUBST(SSL_LDFLAGS)
AC_SUBST(SSL_LIBS)
AM_CONDITIONAL(POLARSSL, test "x${USE_POLARSSL}" = "xyes")

dnl Required headers
AS_IF([test "x${USE_POLARSSL}" != "xyes"], [
  dnl First check to see if openssl is installed
  AC_CHECK_HEADERS([openssl/ssl.h], ,[AC_MSG_ERROR([OpenSSL is not installed, openssl/sslh is missing])])
  AC_CHECK_HEADERS([openssl/bio.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
  AC_CHECK_HEADERS([openssl/err.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
  AC_CHECK_HEADERS([openssl/evp.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
])

AC_CHECK_HEADERS([arpa/inet.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([getopt.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([grp.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([pwd.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([stdint.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([stdio.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([stdlib.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([sys/mman.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([sys/socket.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([sys/time.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([sys/types.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([sys/wait.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([time.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
AC_CHECK_HEADERS([unistd.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])

AC_CHECK_HEADERS([linux/rtc.h])
AC_CHECK_TYPES([struct rtc_time], [], [], [
#ifdef HAVE_LINUX_RTC_H
#include <linux/rtc.h>
#endif
])

AC_CHECK_FUNCS([strchrnul])
AM_CONDITIONAL(HAVE_STRCHRNUL, [test "x${ac_cv_func_strchrnul}" = xyes])

AC_CHECK_FUNCS([strnlen])
AM_CONDITIONAL(HAVE_STRNLEN, [test "x${ac_cv_func_strnlen}" = xyes])

AC_CHECK_FUNCS_ONCE(m4_flatten([
    gettimeofday
    prctl
    preadv
    pwritev
    setresuid
]))

AC_CHECK_FUNCS([fmemopen funopen])
AM_CONDITIONAL(HAVE_FMEMOPEN, [test "x${ac_cv_func_fmemopen}" = xyes])
AM_CONDITIONAL(HAVE_FUNOPEN, [test "x${ac_cv_func_funopen}" = xyes])

case "$host" in
  *-darwin*)
    dnl This is for Mac OS X (10.8.2)
    AC_CHECK_HEADERS([mach/clock.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
    AC_CHECK_HEADERS([mach/mach.h], ,[AC_MSG_ERROR([Required headers missing; compilation will not succeed])])
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                                [Group to drop privs to @<:@default: nogroup@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nobody"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *-freebsd*)
    dnl This is for FreeBSD
    dnl clock_gettime is either part of libc or unavailable.
    AC_CHECK_FUNC([clock_gettime], ,
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])
    dnl If the autoconf goo picks up a compiler that runs in pre-POSIX mode,
    dnl the fmemopen prototype is hidden causing the unit tests to segfault.
    dnl This can happen if gcc is a symlink to gcc46 and is preferred to clang.
    AC_CHECK_FUNC([fmemopen], ,
                  [AC_MSG_WARN([Missing fmemopen, unit tests are likely to segfault. Try CC=clang.])])
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nobody@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nobody"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *kfreebsd*-gnu*)
    dnl This is for Debian GNU/kFreeBSD
    dnl clock_gettime is either part of libc or unavailable.
    dnl Check for clock_gettime.  Some systems put it into -lc, while
    dnl others use -lrt.  Try the first and fallback to the latter.
    RT_LIB=
    AC_CHECK_FUNC([clock_gettime], [:],
                  [AC_CHECK_LIB([rt], [clock_gettime], [RT_LIB="-lrt"],
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])])
    AC_SUBST(RT_LIB)
    dnl If the autoconf goo picks up a compiler that runs in pre-POSIX mode,
    dnl the fmemopen prototype is hidden causing the unit tests to segfault.
    dnl This can happen if gcc is a symlink to gcc46 and is preferred to clang.
    AC_CHECK_FUNC([fmemopen], ,
                  [AC_MSG_ERROR([Missing fmemopen, unit tests are likely to segfault. Try CC=clang.])])
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nobody@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nobody"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *-netbsd*)
    dnl This is for NetBSD
    dnl clock_gettime is either part of libc or unavailable.
    AC_CHECK_FUNC([clock_gettime], ,
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])
    if test "x${ac_cv_func_fmemopen}" != xyes; then
        if test "x${ac_cv_func_funopen}" != xyes; then
            AC_MSG_ERROR([We need fmemopen or funopen for unit tests.])
        fi
    fi
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nobody@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nobody"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *-openbsd*)
    dnl This is for OpenBSD
    dnl clock_gettime is either part of libc or unavailable.
    AC_CHECK_FUNC([clock_gettime], ,
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])
    dnl If the autoconf goo picks up a compiler that runs in pre-POSIX mode,
    dnl the fmemopen prototype is hidden causing the unit tests to segfault.
    dnl This can happen if gcc is a symlink to gcc46 and is preferred to clang.
    AC_CHECK_FUNC([fmemopen], ,
                  [AC_MSG_WARN([Missing fmemopen, unit tests are likely to segfault. Try CC=clang.])])
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nobody@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nobody"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *dragonfly*)
    dnl This is for DragonFly BSD
    dnl clock_gettime is either part of libc or unavailable.
    AC_CHECK_FUNC([clock_gettime], ,
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])
    dnl If the autoconf goo picks up a compiler that runs in pre-POSIX mode,
    dnl the fmemopen prototype is hidden causing the unit tests to segfault.
    dnl This can happen if gcc is a symlink to gcc46 and is preferred to clang.
    AC_CHECK_FUNC([fmemopen], ,
                  [AC_MSG_WARN([Missing fmemopen, unit tests are likely to segfault. Try CC=clang.])])
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nobody@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nobody"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *-bsd*)
    dnl This is a generic catch for BSD variants
    dnl This likely needs to be tuned to catch all
    dnl clock_gettime is either part of libc or unavailable.
    AC_CHECK_FUNC([clock_gettime], ,
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])
    dnl If the autoconf goo picks up a compiler that runs in pre-POSIX mode,
    dnl the fmemopen prototype is hidden causing the unit tests to segfault.
    dnl This can happen if gcc is a symlink to gcc46 and is preferred to clang.
    AC_CHECK_FUNC([fmemopen], ,
                  [AC_MSG_ERROR([Missing fmemopen, unit tests are likely to segfault. Try CC=clang.])])
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nobody@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nobody"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *-linux*)
    dnl This is for GNU/Linux
    dnl Check for clock_gettime.  Some systems put it into -lc, while
    dnl others use -lrt.  Try the first and fallback to the latter.
    RT_LIB=
    AC_CHECK_FUNC([clock_gettime], [:],
                  [AC_CHECK_LIB([rt], [clock_gettime], [RT_LIB="-lrt"],
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])])
    AC_SUBST(RT_LIB)
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nogroup@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nogroup"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    case "$host" in
      *-linux-androideabi)
        dnl This is for Android NDK as it is a special case of linux
        AC_DEFINE(HAVE_ANDROID,1, [Defined if we are to build for an Android system])
        AC_SUBST(HAVE_ANDROID, [1])
        HAVE_ANDROID="yes"
        ;;
    esac
    ;;
  *-gnu0.*)
    dnl This is a generic catch for GNU/Hurd variants
    dnl Check for clock_gettime.  Some systems put it into -lc, while
    dnl others use -lrt.  Try the first and fallback to the latter.
    RT_LIB=
    AC_CHECK_FUNC([clock_gettime], [:],
                  [AC_CHECK_LIB([rt], [clock_gettime], [RT_LIB="-lrt"],
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])])
    AC_SUBST(RT_LIB)
    dnl If the autoconf goo picks up a compiler that runs in pre-POSIX mode,
    dnl the fmemopen prototype is hidden causing the unit tests to segfault.
    dnl This can happen if gcc is a symlink to gcc46 and is preferred to clang.
    AC_CHECK_FUNC([fmemopen], ,
                  [AC_MSG_ERROR([Missing fmemopen, unit tests are likely to segfault. Try CC=clang.])])
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nobody@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nogroup"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *-cygwin*)
    dnl This is for Cygwin
    dnl Check for clock_gettime.  Some systems put it into -lc, while
    dnl others use -lrt.  Try the first and fallback to the latter.
    RT_LIB=
    AC_CHECK_FUNC([clock_gettime], [:],
                  [AC_CHECK_LIB([rt], [clock_gettime], [RT_LIB="-lrt"],
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])])
    AC_SUBST(RT_LIB)
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nogroup@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nogroup"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *-mingw32*)
    dnl This is for MINGW32_NT
    dnl Check for clock_gettime.  Some systems put it into -lc, while
    dnl others use -lrt.  Try the first and fallback to the latter.
    RT_LIB=
    AC_CHECK_FUNC([clock_gettime], [:],
                  [AC_CHECK_LIB([rt], [clock_gettime], [RT_LIB="-lrt"],
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])])
    AC_SUBST(RT_LIB)
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nogroup@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nogroup"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    ;;
  *-beos*|*-haiku*)
    dnl This is for BeOS and Haiku; we probably only support Haiku with gcc4
    dnl Check for clock_gettime.  Some systems put it into -lc, while
    dnl others use -lrt.  Try the first and fallback to the latter.
    dnl on Haiku we require the bsd library for strsep
    RT_LIB=
    AC_CHECK_FUNC([clock_gettime], [:],
                  [AC_CHECK_LIB([rt], [clock_gettime], [RT_LIB="-lrt"],
                  [AC_MSG_ERROR([Your system lacks clock_gettime])])])
    AC_SUBST(RT_LIB)
    AC_ARG_WITH([unpriv-group],
                [AS_HELP_STRING([--with-unpriv-group=<group>],
                [Group to drop privs to @<:@default: nogroup@:>@])])
    AS_CASE([$with_unpriv_group],
            [""|yes|no], [UNPRIV_GROUP="nogroup"],
            [*], [UNPRIV_GROUP=$with_unpriv_group])
    AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
    LDFLAGS="$LDFLAGS -lbsd"
    CC="/boot/develop/abi/x86/gcc4/tools/gcc-4.6.3-haiku-121101/bin/gcc"
    ;;
  *)
   AC_ARG_WITH([unpriv-group],
               [AS_HELP_STRING([--with-unpriv-group=<group>],
               [Group to drop privs to @<:@default: nogroup@:>@])])
   AS_CASE([$with_unpriv_group],
           [""|yes|no], [UNPRIV_GROUP="nogroup"],
           [*], [UNPRIV_GROUP=$with_unpriv_group])
   AC_DEFINE_UNQUOTED([UNPRIV_GROUP], ["${UNPRIV_GROUP}"], [Unprivileged group])
   ;;
esac

dnl Android conditional
AM_CONDITIONAL(HAVE_ANDROID, test "x${HAVE_ANDROID}" = "xyes")

AC_MSG_CHECKING([user/group to drop privs to])

AC_ARG_WITH([unpriv-user],
            [AS_HELP_STRING([--with-unpriv-user=<user>],
                            [User to drop privs to @<:@default: nobody@:>@])])
AS_CASE([$with_unpriv_user],
        [""|yes|no], [UNPRIV_USER="nobody"],
        [*], [UNPRIV_USER=$with_unpriv_user])
AC_DEFINE_UNQUOTED([UNPRIV_USER], ["${UNPRIV_USER}"], [Unprivileged user])
AC_SUBST([UNPRIV_USER])

AC_MSG_RESULT(${UNPRIV_USER}:${UNPRIV_GROUP})

AC_MSG_CHECKING([group to allow DBus calls from])
AC_ARG_WITH([dbus-client-group],
            [AS_HELP_STRING([--with-dbus-client-group=<group>],
                [Allow dbus method calls from group @<:@default: root@:>@])])
AS_CASE([$with_dbus_client_group],
        [""|yes|no], [DBUS_CLIENT_GROUP="root"],
        [*], [DBUS_CLIENT_GROUP=$with_dbus_client_group])
AC_DEFINE_UNQUOTED([DBUS_CLIENT_GROUP], ["${DBUS_CLIENT_GROUP}"], [DBus client group])
AC_MSG_RESULT(${DBUS_CLIENT_GROUP})
AC_SUBST([DBUS_CLIENT_GROUP])

dnl Check for clock_gettime.  Some systems put it into -lc, while
dnl others use -lrt.  Try the first and fallback to the latter.
RT_LIB=
AC_CHECK_FUNC([clock_gettime], [:],
              [AC_CHECK_LIB([rt], [clock_gettime], [RT_LIB="-lrt"],
                            [AC_MSG_ERROR([Your system lacks clock_gettime])])])
AC_SUBST(RT_LIB)

PKG_CHECK_MODULES([LIBEVENT], [libevent >= 2.0])

have_dbus=false
AC_ARG_ENABLE([dbus],
	      [AS_HELP_STRING([--disable-dbus],
			      [Disable automatically dbus support])])
AS_IF([test "x$enable_dbus" = xyes], [
    PKG_CHECK_MODULES([DBUS], [dbus-1], [
            have_dbus=true
            AC_DEFINE([HAVE_DBUS], [1], [dbus enabled])
        ], [
            AS_IF([test "x$enable_dbus" = xyes],
                  [AC_MSG_ERROR([dbus requested but not found])])
        ])
    ])
AM_CONDITIONAL([HAVE_DBUS], ${have_dbus})

AC_SUBST(DBUS_CFLAGS)
AC_SUBST(DBUS_LIBS)
AC_SUBST(LIBEVENT_CFLAGS)
AC_SUBST(LIBEVENT_LIBS)

have_seccomp_filter=false
AC_ARG_ENABLE([seccomp_filter],
              [AS_HELP_STRING([--enable-seccomp-filter],
                              [Require seccomp filter])])

AC_MSG_CHECKING([kernel for seccomp_filter support])
AS_IF([test "x$enable_seccomp_filter" = xyes], [
    dnl Force seccomp filter use
    have_seccomp_filter=true
    AC_MSG_RESULT([forced])
  ], [
  AS_IF([test "x$enable_seccomp_filter" = xno], [
      have_seccomp_filter=no
      AC_MSG_RESULT([disabled])
  ], [
  dnl Detect seccomp filter support.
  AC_RUN_IFELSE([AC_LANG_PROGRAM([[
      #include <errno.h>
      #include <linux/audit.h>
      #include <linux/filter.h>
      #include <stdlib.h>
      #include <sys/prctl.h>
      #include "src/seccomp-compat.h"
    ]],
    [[ errno = 0;
       if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0))
         exit(1);
       prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, 0, 0);
       exit(errno == EFAULT ? 0 : 1); ]])],
    [ AC_MSG_RESULT([yes])
      have_seccomp_filter=true
    ], [
      AC_MSG_RESULT([no])
    ],
    [ AC_MSG_RESULT([cross-compiling, assuming yes])
      have_seccomp_filter=true
    ]
  )
])])

AS_IF([${have_seccomp_filter}], [
    AC_DEFINE([HAVE_SECCOMP_FILTER], [1], [Enable seccomp filter])
  ])
AM_CONDITIONAL([HAVE_SECCOMP_FILTER], ${have_seccomp_filter})


have_seccomp_debug=false
AC_ARG_ENABLE([seccomp_debugging],
              [AS_HELP_STRING([--enable-seccomp-debugging],
                [Enable seccomp filter debugging])])
AS_IF([test "x$enable_seccomp_debugging" = xyes], [
    AC_DEFINE([SECCOMP_FILTER_DEBUG], [1], [Enable seccomp filter debugging])
    have_seccomp_debug=true
  ])
AM_CONDITIONAL([SECCOMP_FILTER_DEBUG], ${have_seccomp_debug})


AC_MSG_CHECKING([for CrOS-specific platform wake event support])
AC_ARG_ENABLE([cros],
              [AS_HELP_STRING([--disable-cros],
                              [Disable CrOS platform support])])

AS_IF([test "x$enable_cros" = xyes -a "x$enable_dbus" != xyes ], [
    AC_MSG_ERROR([--enable-dbus is required for --enable-cros])
  ])

have_cros=false
AS_IF([test "x$enable_cros" = xyes], [
    have_cros=true
    AC_DEFINE([HAVE_CROS], [1], [Enable CrOS support])
    AC_MSG_RESULT([yes])
  ], [
    AC_MSG_RESULT([no])
  ])
AM_CONDITIONAL([HAVE_CROS], ${have_cros})

dnl Debug and hardening flags all in one shot
dnl Always do this at the end, otherwise you end up filtering system/other libraries
AC_ARG_ENABLE([hardened-checks],
              [AS_HELP_STRING([--disable-hardened-checks],
                              [Disable automatically enabling hardened toolchain options])])
AC_DEFUN([LOCAL_CHECK_FLAGS],[
          AC_REQUIRE([AX_CHECK_LINK_FLAG])
          AC_REQUIRE([AX_APPEND_COMPILE_FLAGS])
          AC_LANG_PUSH([C])
          AS_IF([test "x$enable_hardened_checks" != xno], [
              AX_APPEND_COMPILE_FLAGS([-g -O1])
          ], [
              AC_MSG_WARN([using hardened flags is HIGHLY RECOMMENDED and disabling them is a BAD IDEA])
          ])
          AX_APPEND_COMPILE_FLAGS([-Wall -fno-strict-aliasing])
          AS_IF([test "x$enable_hardened_checks" != xno], [
              AX_APPEND_COMPILE_FLAGS([-D_FORTIFY_SOURCE=2 -fstack-protector-all])
              AX_APPEND_COMPILE_FLAGS([-fwrapv -fPIE -Wstack-protector])
              AX_APPEND_COMPILE_FLAGS([--param=ssp-buffer-size=1])
              AX_CHECK_LINK_FLAG([-z relro -z now])
              AX_CHECK_LINK_FLAG([-pie])
          ])
          AC_LANG_POP
          ])
LOCAL_CHECK_FLAGS

AC_ARG_ENABLE([code-coverage-checks],
              [AS_HELP_STRING([--enable-code-coverage-checks],
                              [Enable gcov/lcov compile time options])],
              [AX_APPEND_COMPILE_FLAGS([-ftest-coverage -fprofile-arcs])])

AC_CONFIG_FILES([dbus/org.torproject.tlsdate.conf])
AC_CONFIG_FILES([Makefile])
AC_OUTPUT