netsniff-ng: Restore tpacket v2 capturing

Some older systems (e.g. RHEL 6) don't have tpacket v3 available, but
only tpacket v2. However, since commit d8cdc6a ("ring: netsniff-ng:
migrate capture only to TPACKET_V3") we solely rely on tpacket v3 for
capturing packets.

This patch restores the possibility to capture using tpacket v2. For now
this is just a fallback if the configure script doesn't detect tpacket
v3 (and thus HAVE_TPACKET3 isn't set). Thus, on most modern systems this
shouldn't change anything and they will continue using tpacket v3.

For now this fix contains quite a bit of ugly #ifdefery which should be
cleaned up in the future.

Fixes #76

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

1 files changed, 0 insertions, 1 deletions

diff --git a/configure b/configure
index d9cebff..1ac21be 100755
--- a/configure
+++ b/configure
@@ -206,7 +206,6 @@ EOF
 	if [ ! -x $TMPDIR/tpacketv3test ] ; then
 		echo "[NO]"
 		MISSING_DEFS=1
-		tools_remove "netsniff-ng"
 	else
 		echo "[YES]"
 		HAVE_TPACKET3=1