Hi Guix,
libpcap comes with a couple of backends that are disabled by default.
Among those available backends is “pcap-linux”. By default the only
backends are
pcap-null
pcap-usb-linux
pcap-can-linux
pcap-netfilter-linux
pcap-common
‘netfilter-linux’ doesn’t work out of the box and I think it requires
loading iptables/netfilter kernel modules (I have not yet found the
correct modules to load, so I can only guess). When “--with-pcap=linux”
is passed “pcap-linux.c” is compiled as well, which makes tcpdump work
out of the box without the need to load any further modules.
Thanks to Ludovic for providing a crucial bit of information!
~~ Ricardo
>From 7ca2d0dc5cc1232605e2b78167ea3ae5c92be531 Mon Sep 17 00:00:00 2001
From: Ricardo Wurmus <rek...@elephly.net>
Date: Wed, 15 Jul 2015 16:11:50 +0200
Subject: [PATCH] gnu: libpcap: Enable plain "linux" backend.
* gnu/packages/admin.scm (libpcap)[arguments]: Add "--with-pcap=linux"
configure flag.
---
gnu/packages/admin.scm | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gnu/packages/admin.scm b/gnu/packages/admin.scm
index c96e116..5b56599 100644
--- a/gnu/packages/admin.scm
+++ b/gnu/packages/admin.scm
@@ -476,7 +476,8 @@ tools: server, client, and relay agent.")
"14wyjywrdi1ikaj6yc9c72m6m2r64z94lb0gm7k1a3q6q5cj3scs"))))
(build-system gnu-build-system)
(native-inputs `(("bison" ,bison) ("flex" ,flex)))
- (arguments '(#:tests? #f)) ; no 'check' target
+ (arguments '(#:configure-flags '("--with-pcap=linux")
+ #:tests? #f)) ; no 'check' target
(home-page "http://www.tcpdump.org";)
(synopsis "Network packet capture library")
(description
--
2.4.3
