[OpenWrt-Devel] [PATCH] mdnsd: interface: enable looped back messages

[Eyal Birger]

When the IP_MULTICAST_LOOP/IPV6_MULTICAST_LOOP socket options are not enabled,
locally generated queries are ignored by mdnsd; This prevents local
applications from being able to discover locally published services.

Signed-off-by: Eyal Birger <eyal.birger at gmail.com>
---
 interface.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/interface.c b/interface.c
index c8d8972..9ca85e1 100644
--- a/interface.c
+++ b/interface.c
@@ -315,7 +315,7 @@ interface_mcast_setup4(struct interface *iface)
 {
 	struct ip_mreqn mreq;
 	uint8_t ttl = 255;
-	int no = 0;
+	int yes = 1;
 	struct sockaddr_in sa = { 0 };
 	int fd = iface->fd.fd;
 
@@ -345,7 +345,7 @@ interface_mcast_setup4(struct interface *iface)
 		return -1;
 	}
 
-	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &no, sizeof(no)) < 0)
+	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0)
 		fprintf(stderr, "ioctl failed: IP_MULTICAST_LOOP\n");
 
 	return 0;
@@ -356,7 +356,7 @@ interface_socket_setup6(struct interface *iface)
 {
 	struct ipv6_mreq mreq;
 	int ttl = 255;
-	int no = 0;
+	int yes = 1;
 	struct sockaddr_in6 sa = { 0 };
 	int fd = iface->fd.fd;
 
@@ -379,7 +379,7 @@ interface_socket_setup6(struct interface *iface)
 		return -1;
 	}
 
-	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &no, sizeof(no)) < 0)
+	if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &yes, sizeof(yes)) < 0)
 		fprintf(stderr, "ioctl failed: IPV6_MULTICAST_LOOP\n");
 
 	return 0;
-- 
1.9.1
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