llmnrd: don't exit on SO_BINDTODEVICE failure

The -i option requires running llmnrd as root for SO_BINDTODEVICE to
work. Packets are still filtered based on interface because only rtnl
messages for addresses of the specified interface are considered in
iface_nlmsg_change_addr. Instead log a warning only if SO_BINDTODEVICE
fails.

Signed-off-by: Jon Franklin <jvfranklin@gmail.com>
[tk: small adjustments to commit message, check return value of iface_init]
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 4 insertions, 1 deletions

diff --git a/llmnrd.c b/llmnrd.c
index d076484..ba5023c 100644
--- a/llmnrd.c
+++ b/llmnrd.c
@@ -236,7 +236,10 @@ int main(int argc, char **argv)
 		goto out;
 
 	llmnr_init(hostname, ipv6);
-	iface_init(llmnrd_sock_rtnl, iface, ipv6, &iface_event_handle);
+
+	ret = iface_init(llmnrd_sock_rtnl, iface, ipv6, &iface_event_handle);
+	if (ret < 0)
+		goto out;
 
 	nfds = max(llmnrd_sock_ipv4, llmnrd_sock_rtnl);
 	if (llmnrd_sock_ipv6 >= 0)