dnl intro
dnl AC_PREREQ(2.50)
AC_INIT(libipt_SIGN.c)
AC_PROG_CC
AC_PROG_MAKE_SET
AC_PROG_RANLIB

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_INLINE
AC_TYPE_SIZE_T

dnl ########################################
dnl Checks for kernel includes

KERNEL_inc_check="/usr/src/linux $HOME/linux $HOME/download/linux"

AC_ARG_WITH(kernel,
    [  --with-kernel-source=<path>
                          directory path of kernel source],
    [KERNEL_inc_check="$withval/ $withval/../"])


AC_MSG_CHECKING([for kernel include directory])
KERNEL_incdir=
for m in $KERNEL_inc_check; do
        if test -d "$m" && test -f "$m/include/linux/netfilter_ipv4/ip_tables.h"
        then
                KERNEL_incdir=$m/include
                break
        fi
done

case "$KERNEL_incdir" in
	/*) ;;
	.*) ;;
	* ) AC_MSG_ERROR([Didn't find kernel ip_tables.h header, use --with-kernel-source]) ;;
esac


AC_MSG_RESULT([$KERNEL_incdir])

AC_MSG_CHECKING([if kernel headers are of the right version])

KERNEL_DISK_VERSION=$(grep UTS_RELEASE $KERNEL_incdir/linux/version.h | 
	cut -f3 -d" " | sed s/\"//g)

if test $KERNEL_DISK_VERSION \!= $(uname -r)
then
	AC_MSG_ERROR([No. Use --with-kernel-source])
fi
AC_MSG_RESULT([yes - $KERNEL_DISK_VERSION==$(uname -r)])

CFLAGS="$CFLAGS -I$KERNEL_incdir"



dnl #############################################3
dnl Check for iptables directory

# ~/cvs/netfilter/userspace/include/
IPTABLES_dir_check="$HOME/cvs/netfilter/userspace/ $HOME/netfilter/userspace/ /usr/local/netfilter/"

AC_ARG_WITH(iptables,
    [  --with-iptables-source=<path>
                          directory path of iptables source],
    [IPTABLES_dir_check="$withval/ $withval/../"])


AC_MSG_CHECKING([for iptables directory])
IPTABLES_dir=
for m in $IPTABLES_dir_check; do
        if test -d "$m" && test -f "$m/include/iptables.h"
        then
                IPTABLES_dir=$m
                break
        fi
done

case "$IPTABLES_dir" in
	/*) ;;
	.*) ;;
	* ) AC_MSG_ERROR([Didn't find iptables iptables.h header, use --with-iptables-source]) ;;
esac



AC_MSG_RESULT([$IPTABLES_dir])
CFLAGS="$CFLAGS -I$IPTABLES_dir/include/"

IPTABLES_lib_dir=""

AC_ARG_WITH(iptables-modules,
    [  --with-iptables-modules=<path>
                          directory of iptables installed modules],
    [IPTABLES_lib_dir="$withval/"])

AC_MSG_CHECKING([for iptables module install directory])
if test "-z $IPTABLES_lib_dir" -a "-f $IPTABLES_dir/iptables"
then
	IPTABLES_lib_dir=$(strings $IPTABLES_dir/iptables | grep libipt_%s.so | 
	sed s/libipt_%s.so//)
fi

if test -z $IPTABLES_lib_dir
then
	AC_MSG_ERROR([Could not find iptables binary, specify iptables modules install directory\nwith --with-iptables-modules])
fi

AC_MSG_RESULT([$IPTABLES_lib_dir])

AC_MSG_CHECKING([netfilter version we are building against])

NETFILTER_VERSION=$($IPTABLES_dir/iptables --version | cut -f2 -dv)

AC_MSG_RESULT([$NETFILTER_VERSION])

CFLAGS="$CFLAGS -DNETFILTER_VERSION=\\\"$NETFILTER_VERSION\\\""
libexecdir=$IPTABLES_lib_dir


AC_OUTPUT(Makefile)