iftable: fix incomplete list of interfaces via nlif_query

RTM_GETLINK with NLM_F_DUMP returns a multi-part netlink message.
The existing code only handled the first message of it, thus,
ignoring the remaining interfaces.

This is the cause of the following bug in conntrackd:

[Thu Aug  9 14:14:23 2012] (pid=3819) [notice] -- starting in daemon mode --
[Thu Aug  9 14:14:23 2012] (pid=3819) [ERROR] no dedicated links available!
[Thu Aug  9 14:14:23 2012] (pid=3819) [ERROR] no dedicated links available!
[Thu Aug  9 14:14:23 2012] (pid=3819) [ERROR] no dedicated links available!
[Thu Aug  9 14:19:54 2012] (pid=3819) [notice] ---- shutdown received ----

Thanks to Jan Engelhardt for providing useful pointer to address the
problem.

Reported-by: Arturo Borrero <aborrero@cica.es>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/rtnl.h b/src/rtnl.h
index bf018d4..0c403dc 100644
--- a/src/rtnl.h
+++ b/src/rtnl.h
@@ -32,5 +32,6 @@ int rtnl_dump_type(struct rtnl_handle *rtnl_handle, unsigned int type);
 struct rtnl_handle *rtnl_open(void);
 void rtnl_close(struct rtnl_handle *rtnl_handle);
 int rtnl_receive(struct rtnl_handle *rtnl_handle);
+int rtnl_receive_multi(struct rtnl_handle *rtnl_handle);
 
 #endif