dnl Process this file with autoconf to produce a configure script.
AC_INIT(ndpmon.c)

CFLAGS="-O2"

dnl find and test the C compiler
AC_PROG_CC
AC_LANG_C
        
AC_PROG_MAKE_SET

dnl #####################################################
dnl Set the directory for variable data
dnl #####################################################
case $prefix in
	/usr )
		VARDATADIR="/var"
		;;
	*)
		VARDATADIR="/var/local"
		;;
esac

dnl Possible to modify it with --with-var-datadir
found_var=no
AC_MSG_CHECKING(for custom variable data directory)
AC_ARG_WITH([var-datadir], [--with-var-datadir=DIR	Put Variable Data in DIR], [VARDATADIR=$withval])

for testdir in $xml2_dir /usr/local /usr ; do
    if test -x "${testdir}/include/libxml2" -a $found_xml2 = no ; then
       CFLAGS="$CFLAGS -I${testdir}/include"
       LIBS="$LIBS -L${testdir}/lib -lxml2"
       found_xml2=$testdir
    fi
done

dnl #####################################################
dnl OS Type
dnl #####################################################

AC_MSG_CHECKING(OS Type)
case $OSTYPE in
	linux-gnu | linux-gnueabi | linux | Linux )
		AC_MSG_RESULT($OSTYPE)
		OPTIONS="$OPTIONS -D_LINUX_"
		MAKEDIR="make -C ./plugins/mac_resolv"
		;;

	FreeBSD* | freebsd* | Darwin* | darwin* )
		AC_MSG_RESULT($OSTYPE)
		CFLAGS="$CFLAGS -fno-strict-aliasing -pipe "
		OPTIONS="$OPTIONS -D_FREEBSD_"
		MAKEDIR="make -C ./plugins/mac_resolv"
		;;

	openbsd4.1* | openbsd* | OpenBSD* )
		dnl Does not seem to work, dunno why.....
		AC_MSG_RESULT($OSTYPE)
		CFLAGS="$CFLAGS -fno-strict-aliasing -pipe "
		OPTIONS="$OPTIONS -D_OPENBSD_"
		MAKEDIR="make -I"
		;;

	netbsd* | NetBSD* )
		AC_MSG_RESULT($OSTYPE)
		CFLAGS="$CFLAGS -fno-strict-aliasing -pipe "
		OPTIONS="$OPTIONS -D_OPENBSD_"
		MAKEDIR="cd ./plugins/mac_resolv;make;cd -"
		;;

	*)
		dnl Recheck for OpenBSD with uname
		os=`uname`
		case $os in
			OpenBSD* | openbsd* )
				AC_MSG_RESULT($os)
				CFLAGS="$CFLAGS -fno-strict-aliasing -pipe "
				OPTIONS="$OPTIONS -D_OPENBSD_"
				MAKEDIR="cd ./plugins/mac_resolv;make;cd -"
				;;

			NetBSD* | netbsd* )
				AC_MSG_RESULT($OSTYPE)
				CFLAGS="$CFLAGS -fno-strict-aliasing -pipe "
				OPTIONS="$OPTIONS -D_OPENBSD_"
				MAKEDIR="cd ./plugins/mac_resolv;make;cd -"
				;;

			*)
				AC_MSG_ERROR([Only Linux, Mac Os X, FreeBSD, NetBSD  and OpenBSD are supported. Please contact the author to know how you can add more OS types.])
				;;
		esac
esac

dnl #####################################################
dnl Checks for libxml2
dnl #####################################################

found_xml2=no
xml2_dir=/usr/local
AC_MSG_CHECKING(for libxml2)
AC_ARG_WITH([libxml2], [--with-libxml2=DIR	Use libxml2 in DIR], [xml2_dir=$withval])

for testdir in $xml2_dir /usr/local /usr ; do
    if test -x "${testdir}/include/libxml2" -a $found_xml2 = no ; then
       CFLAGS="$CFLAGS -I${testdir}/include"
       LIBS="$LIBS -L${testdir}/lib -lxml2"
       found_xml2=$testdir
    fi
done

if test $found_xml2 = no ; then
   AC_MSG_RESULT(no)
   AC_ERROR(Please install libxml2-dev) 
else
   AC_MSG_RESULT($found_xml2)
fi


dnl #####################################################
dnl Checks for libpcap
dnl #####################################################

found_pcap=no
pcap_dir=/usr/local
AC_MSG_CHECKING(for libpcap)
AC_ARG_WITH([libpcap], [--with-libpcap=DIR	Use libpcap in DIR], [pcap_dir=$withval])

for testdir in $pcap_dir /usr/local /usr ; do
    if test -f "${testdir}/include/pcap.h" -a $found_pcap = no ; then
       CFLAGS="$CFLAGS -I${testdir}/include"
       LIBS="$LIBS -L${testdir}/lib -lpcap"
       found_pcap=$testdir
    fi
done

if test $found_pcap = no ; then
   AC_MSG_RESULT(no)
   AC_ERROR(Please install libpcap-dev) 
else
   AC_MSG_RESULT($found_pcap)
fi


dnl #####################################################
dnl Enable the debugging
dnl #####################################################

debug_enable=no
AC_ARG_ENABLE(debug, [--enable-debug		enable use of extra debugging information [default=no]],debug_enable=yes)
AC_MSG_CHECKING(for -g during building)
if test "$debug_enable" = "yes"; then
	CFLAGS="$CFLAGS -g"
	AC_MSG_RESULT("Extra debugging information activated")
else
	AC_MSG_RESULT("Extra debugging information NOT activated")
fi

dnl #####################################################
dnl Enable the mac_resolv plugin
dnl #####################################################
AC_ARG_ENABLE(mac-resolv, [--enable-mac-resolv	enable MAC Manufacturer Resolution [default=no]],enable_mac_resolv=yes)
AC_MSG_CHECKING(for MAC Resolution)
if test "$enable_mac_resolv" = "yes"; then
	OBJ="$OBJ plugins/mac_resolv/mac_resolv.o"
	CFLAGS="$CFLAGS -I./plugins/mac_resolv"
	OPTIONS="$OPTIONS -D_MACRESOLUTION_"
	AC_MSG_RESULT("MAC Manufacturer Resolution activated")
else
	AC_MSG_RESULT("MAC Manufacturer Resolution NOT activated")
fi

AC_HEADER_STDC
AC_HAVE_HEADERS(stdlib.h errno.h signal.h stdio.h string.h sys/stat.h sys/wait.h unistd.h syslog.h) 
AC_HAVE_HEADERS(stdio.h time.h netinet/in.h netinet/ether.h  netinet/ip6.h netinet/icmp6.h pcap.h time.h arpa/inet.h)
dnl AC_HAVE_HEADERS(libxml/parser.h libxml/tree.h libxml/xpath.h libxml/encoding.h libxml/xmlwriter.h)
AC_CHECK_FUNCS(getaddrinfo socket ntohs inet_pton inet_ntop,,AC_MSG_ERROR([Required standard library function missing]))

AC_SUBST(CFLAGS)
AC_SUBST(LIBS)
AC_SUBST(OBJ)
AC_SUBST(OPTIONS)
AC_SUBST(MAKEDIR)
AC_SUBST(VARDATADIR)
dnl read Makefile.in and write Makefile
AC_OUTPUT([Makefile ndpmon.sh plugins/mac_resolv/Makefile ndpmon_defs.h config_ndpmon.xml neighbor_list.xml])