zebra: fix sockaddr_dl length assumptions (BZ#737)
Quagga makes bad assumptions about sockaddr_dl (on NetBSD, but possibly
on other systems as well). Particularly, sizeof(struct sockaddr_dl)
returns a size that does not include the full sdl_data field, leading to
not enough data being copied. This breaks IPv6 RAs in particular, as
a broken mac address from sockaddr_dl will be included in the packets.
From: Matthias-Christian Ott <ott@mirix.org>
Tested-by: Uwe Toenjes <6bone@6bone.informatik.uni-leipzig.de>
[further simplified + more comments]
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/lib/zclient.c b/lib/zclient.c
index 61c6f73..d316596 100644
--- a/lib/zclient.c
+++ b/lib/zclient.c
@@ -734,7 +734,7 @@
ifp->mtu6 = stream_getl (s);
ifp->bandwidth = stream_getl (s);
#ifdef HAVE_STRUCT_SOCKADDR_DL
- stream_get (&ifp->sdl, s, sizeof (ifp->sdl));
+ stream_get (&ifp->sdl, s, sizeof (ifp->sdl_storage));
#else
ifp->hw_addr_len = stream_getl (s);
if (ifp->hw_addr_len)