#!/bin/bash
# This isn't a configure generated by autoconf!

MISSING_DEFS=0
MISSING_NACL=0

[ -z $CC ] && CC=cc

TMPDIR=$(mktemp -d config.XXXXXX)
trap 'status=$?; rm -rf $TMPDIR; exit $status' EXIT HUP INT QUIT TERM

check_nacl()
{
	echo -n "[*] Checking nacl ... "

	cat > $TMPDIR/nacltest.c << EOF
#include "crypto_hash_sha512.h"
#include "crypto_verify_32.h"
#include "crypto_hash_sha512.h"
#include "crypto_box_curve25519xsalsa20poly1305.h"
#include "crypto_scalarmult_curve25519.h"
#include "crypto_auth_hmacsha512256.h"

int main(void) { }
EOF

	if [ -z $NACL_INC_DIR ] ; then
		NACL_INC_DIR="/usr/include/nacl"
	fi

	if [ -z $NACL_LIB_DIR ] ; then
		NACL_LIB_DIR="/usr/lib"
	fi

	LDFLAGS="-L $NACL_LIB_DIR"
	CFLAGS="-I $NACL_INC_DIR"

	$CC $CFLAGS $LDFLAGS -o $TMPDIR/nacltest $TMPDIR/nacltest.c >> $TMPDIR/config.log 2>&1
	if [ ! -x $TMPDIR/nacltest ] ; then
		echo "[NO]"
		MISSING_NACL=1
	else
		echo "[YES]"
		echo "CONFIG_NACL_INC_DIR:=$NACL_INC_DIR" >> Config
		echo "CONFIG_NACL_LIB_DIR:=$NACL_LIB_DIR" >> Config
	fi

}

check_libnl()
{
	echo -n "[*] Checking libnl ... "

	cat > $TMPDIR/libnltest.c << EOF
#include <libnl3/netlink/genl/genl.h>
#include <libnl3/netlink/genl/family.h>
#include <libnl3/netlink/genl/ctrl.h>
#include <libnl3/netlink/msg.h>
#include <libnl3/netlink/attr.h>
#include <libnl3/netlink/version.h>

#if LIBNL_VER_NUM < LIBNL_VER(3,0)
# error incompatible libnl version
#endif

int main(void) { }
EOF

	$CC $(pkg-config --cflags libnl-3.0) -o $TMPDIR/libnltest $TMPDIR/libnltest.c >> $TMPDIR/config.log 2>&1
	if [ ! -x $TMPDIR/libnltest ] ; then
		echo "[NO]"
		MISSING_DEFS=1
	else
		echo "[YES]"
	fi
}

echo "# This file is autogenerated by the configure script" > Config
check_nacl
check_libnl

if [ "$MISSING_DEFS" == "1" ] ; then
	echo "[!] Some libraries or header definitions are missing or too old."
	echo "    Please refer to the INSTALL file for the libraries needed to"
	echo "    build netsniff-ng."
	exit 1
fi

if [ "$MISSING_NACL" == "1" ] ; then
	echo "[!] The NaCl crypto library is currently not present on your"
	echo "    system or could not be found. Either install it from your"
	echo "    distro or build it manually using 'make nacl' and make sure"
	echo "    that the NACL_INC_DIR and NACL_LIB_DIR variables are set"
	echo "    appropriately."
	exit 1
fi

exit 0