Merge branch 'bug18105'

src/common/address.c

@@ -1697,7 +1697,7 @@ get_interface_address6_via_udp_socket_hack,(int severity,
                                             sa_family_t family,
                                             tor_addr_t *addr))
 {
-  struct sockaddr_storage my_addr, target_addr;
+  struct sockaddr_storage target_addr;
   int sock=-1, r=-1;
   socklen_t addr_len;
 
@@ -1740,21 +1740,19 @@ get_interface_address6_via_udp_socket_hack,(int severity,
     goto err;
   }
 
-  if (tor_getsockname(sock,(struct sockaddr*)&my_addr, &addr_len)) {
+  if (tor_addr_from_getsockname(addr, sock) < 0) {
     int e = tor_socket_errno(sock);
     log_fn(severity, LD_NET, "getsockname() to determine interface failed: %s",
            tor_socket_strerror(e));
     goto err;
   }
 
- if (tor_addr_from_sockaddr(addr, (struct sockaddr*)&my_addr, NULL) == 0) {
-    if (tor_addr_is_loopback(addr) || tor_addr_is_multicast(addr)) {
-      log_fn(severity, LD_NET, "Address that we determined via UDP socket"
-                               " magic is unsuitable for public comms.");
-    } else {
-      r=0;
-    }
- }
+  if (tor_addr_is_loopback(addr) || tor_addr_is_multicast(addr)) {
+    log_fn(severity, LD_NET, "Address that we determined via UDP socket"
+           " magic is unsuitable for public comms.");
+  } else {
+    r=0;
+  }
 
  err:
   if (sock >= 0)

src/common/compat.c

@@ -1392,6 +1392,24 @@ tor_getsockname,(tor_socket_t sock, struct sockaddr *address,
    return getsockname(sock, address, address_len);
 }
 
+/**
+ * Find the local address associated with the socket <b>sock</b>, and
+ * place it in *<b>addr_out</b>.  Return 0 on success, -1 on failure.
+ *
+ * (As tor_getsockname, but instead places the result in a tor_addr_t.) */
+int
+tor_addr_from_getsockname(tor_addr_t *addr_out, tor_socket_t sock)
+{
+  struct sockaddr_storage ss;
+  socklen_t ss_len = sizeof(ss);
+  memset(&ss, 0, sizeof(ss));
+
+  if (tor_getsockname(sock, (struct sockaddr *) &ss, &ss_len) < 0)
+    return -1;
+
+  return tor_addr_from_sockaddr(addr_out, (struct sockaddr *)&ss, NULL);
+}
+
 /** Turn <b>socket</b> into a nonblocking socket. Return 0 on success, -1
  * on failure.
  */

src/common/compat.h

@@ -510,6 +510,8 @@ int get_n_open_sockets(void);
 MOCK_DECL(int,
 tor_getsockname,(tor_socket_t socket, struct sockaddr *address,
                  socklen_t *address_len));
+struct tor_addr_t;
+int tor_addr_from_getsockname(struct tor_addr_t *addr_out, tor_socket_t sock);
 
 #define tor_socket_send(s, buf, len, flags) send(s, buf, len, flags)
 #define tor_socket_recv(s, buf, len, flags) recv(s, buf, len, flags)