configure: Add check for libpcap

libpcap is used to compile tcpdump-like filters in netsniff-ng, so check
for it in configure.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 24 insertions, 0 deletions

diff --git a/configure b/configure
index 2c9142d..4ebe013 100755
--- a/configure
+++ b/configure
@@ -272,6 +272,29 @@ EOF
 	fi
 }
 
+check_libpcap()
+{
+	echo -n "[*] Checking libpcap ... "
+
+	cat > $TMPDIR/pcaptest.c << EOF
+#include <pcap.h>
+
+void main(void)
+{
+	struct bpf_program bpf;
+	int ret = pcap_compile_nopcap(65535, 1, &bpf, "foo.bpf", 1, 0xffffffff);
+}
+EOF
+
+	$CC -o $TMPDIR/pcaptest $TMPDIR/pcaptest.c -lpcap >> $TMPDIR/config.log 2>&1
+	if [ ! -x $TMPDIR/pcaptest ] ; then
+		echo "[NO]"
+		MISSING_DEFS=1
+	else
+		echo "[YES]"
+	fi
+}
+
 echo "# This file is autogenerated by the configure script" > Config
 check_pkg_config
 
@@ -289,6 +312,7 @@ check_ncurses
 check_libgeoip
 check_zlib
 check_urcu
+check_libpcap
 
 if [ "$MISSING_DEFS" == "1" ] ; then
 	echo "[!] Some libraries or header definitions are missing or too old."