gweb: workaround for setsockopt failure

Setting socket option BINDTODEVICE requires CAP_NET_RAW capability.

diff --git a/gweb/gweb.c b/gweb/gweb.c
index 365f67c..5ec4fb1 100644 (file)
--- a/gweb/gweb.c
+++ b/gweb/gweb.c
@@ -37,6 +37,7 @@
 #include <netdb.h>
 #include <net/if.h>
 #include <netinet/tcp.h>
+#include <ifaddrs.h>
 
 #include "giognutls.h"
 #include "gresolv.h"
@@ -954,6 +955,57 @@ static gboolean received_data(GIOChannel *channel, GIOCondition cond,
        return TRUE;
 }
 
+static int bind_to_address(int sk, const char *interface, int family)
+{
+       struct ifaddrs *ifaddr_list, *ifaddr;
+       int size, err = -1;
+
+       if (getifaddrs(&ifaddr_list) < 0)
+               return err;
+
+       for (ifaddr = ifaddr_list; ifaddr != NULL; ifaddr = ifaddr->ifa_next) {
+               if (g_strcmp0(ifaddr->ifa_name, interface) != 0)
+                       continue;
+
+               if (ifaddr->ifa_addr == NULL ||
+                               ifaddr->ifa_addr->sa_family != family)
+                       continue;
+
+               switch (family) {
+               case AF_INET:
+                       size = sizeof(struct sockaddr_in);
+                       break;
+               case AF_INET6:
+                       size = sizeof(struct sockaddr_in6);
+                       break;
+               default:
+                       continue;
+               }
+
+               err = bind(sk, (struct sockaddr *) ifaddr->ifa_addr, size);
+               break;
+       }
+
+       freeifaddrs(ifaddr_list);
+       return err;
+}
+
+static inline int bind_socket(int sk, int index, int family)
+{
+       char interface[IF_NAMESIZE];
+       int err;
+
+       if (if_indextoname(index, interface) == NULL)
+               return -1;
+
+       err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
+                                       interface, IF_NAMESIZE);
+       if (err < 0)
+               err = bind_to_address(sk, interface, family);
+
+       return err;
+}
+
 static int connect_session_transport(struct web_session *session)
 {
        GIOFlags flags;
@@ -965,18 +1017,10 @@ static int connect_session_transport(struct web_session *session)
                return -EIO;
 
        if (session->web->index > 0) {
-               char interface[IF_NAMESIZE];
-
-               memset(interface, 0, IF_NAMESIZE);
-
-               if (if_indextoname(session->web->index, interface) != NULL) {
-                       if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
-                                               interface, IF_NAMESIZE) < 0) {
-                               close(sk);
-                               return -EIO;
-                       }
-
-                       debug(session->web, "Use interface %s", interface);
+               if (bind_socket(sk, session->web->index,
+                                       session->addr->ai_family) < 0) {
+                       close(sk);
+                       return -EIO;
                }
        }