From: John Crispin <blogic@openwrt.org>
Date: Sat, 30 Aug 2014 11:17:02 +0000 (+0200)
Subject: validate incoming interface
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=46e580b2eff6c60837bbbfd55e4a0178d0c9b10b;p=oweals%2Fmdnsd.git

validate incoming interface

Signed-off-by: John Crispin <blogic@openwrt.org>
---

diff --git a/interface.c b/interface.c
index 0d34e72..b875fd4 100644
--- a/interface.c
+++ b/interface.c
@@ -174,10 +174,10 @@ read_socket(struct uloop_fd *u, unsigned int events)
 		else if (cmsgptr->cmsg_level == IPPROTO_IPV6 && cmsgptr->cmsg_type == IPV6_PKTINFO)
 			ifindex = ((struct in6_pktinfo *) c)->ipi6_ifindex;
 	}
-	if (ifindex)
+	if (ifindex != iface->ifindex)
+		fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
+	else
 		dns_handle_packet(iface, buffer, len);
-
-	printf("%d\n", ifindex);
 }
 
 static int