gresolv: Bind socket to the right interface

diff --git a/gweb/gresolv.c b/gweb/gresolv.c
index 6bfc20a..7c4c0bc 100644 (file)
--- a/gweb/gresolv.c
+++ b/gweb/gresolv.c
@@ -34,6 +34,7 @@
 #include <netdb.h>
 #include <arpa/inet.h>
 #include <arpa/nameser.h>
+#include <net/if.h>
 
 #include "gresolv.h"
 
@@ -760,6 +761,26 @@ static int connect_udp_channel(struct resolv_nameserver *nameserver)
                return -EIO;
        }
 
+       /*
+        * If nameserver points to localhost ip, their is no need to
+        * bind the socket on any interface.
+        */
+       if (nameserver->resolv->index > 0 &&
+                       strncmp(nameserver->address, "127.0.0.1", 9) != 0) {
+               char interface[IF_NAMESIZE];
+
+               memset(interface, 0, IF_NAMESIZE);
+               if (if_indextoname(nameserver->resolv->index,
+                                               interface) != NULL) {
+                       if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
+                                               interface, IF_NAMESIZE) < 0) {
+                               close(sk);
+                               freeaddrinfo(rp);
+                               return -EIO;
+                       }
+               }
+       }
+
        if (connect(sk, rp->ai_addr, rp->ai_addrlen) < 0) {
                close(sk);
                freeaddrinfo(rp);
@@ -879,14 +900,13 @@ gboolean g_resolv_add_nameserver(GResolv *resolv, const char *address,
        nameserver->address = g_strdup(address);
        nameserver->port = port;
        nameserver->flags = flags;
+       nameserver->resolv = resolv;
 
        if (connect_udp_channel(nameserver) < 0) {
                free_nameserver(nameserver);
                return FALSE;
        }
 
-       nameserver->resolv = resolv;
-
        resolv->nameserver_list = g_list_append(resolv->nameserver_list,
                                                                nameserver);