ws2_32: Ensure default route IP addresses are returned first in gethostbyname

[Bruno Jesus]

Store an ID for each default route found and use it to help sorting
the IP list. This patch has been in Staging for 6 months, I believe it
to be safe.

Fixes:
https://bugs.winehq.org/show_bug.cgi?id=37271
https://bugs.winehq.org/show_bug.cgi?id=22819

Signed-off-by: Bruno Jesus <00cpxxx at gmail.com>
-------------- next part --------------
diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index d31f0b4..6877063 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -596,7 +596,7 @@ struct per_thread_data
 struct route {
     struct in_addr addr;
     IF_INDEX interface;
-    DWORD metric;
+    DWORD metric, default_route;
 };
 
 static INT num_startup;          /* reference counter */
@@ -5931,7 +5931,14 @@ struct WS_hostent* WINAPI WS_gethostbyaddr(const char *addr, int len, int type)
  */
 static int WS_compare_routes_by_metric_asc(const void *left, const void *right)
 {
-    return ((const struct route*)left)->metric - ((const struct route*)right)->metric;
+    const struct route *a = left, *b = right;
+    if (a->default_route && b->default_route)
+        return a->default_route - b->default_route;
+    if (a->default_route && !b->default_route)
+        return -1;
+    if (b->default_route && !a->default_route)
+        return 1;
+    return a->metric - b->metric;
 }
 
 /***********************************************************************
@@ -5948,7 +5955,7 @@ static int WS_compare_routes_by_metric_asc(const void *left, const void *right)
  */
 static struct WS_hostent* WS_get_local_ips( char *hostname )
 {
-    int numroutes = 0, i, j;
+    int numroutes = 0, i, j, default_routes = 0;
     DWORD n;
     PIP_ADAPTER_INFO adapters = NULL, k;
     struct WS_hostent *hostlist = NULL;
@@ -5975,10 +5982,13 @@ static struct WS_hostent* WS_get_local_ips( char *hostname )
     for (n = 0; n < routes->dwNumEntries; n++)
     {
         IF_INDEX ifindex;
-        DWORD ifmetric;
+        DWORD ifmetric, ifdefault = 0;
         BOOL exists = FALSE;
 
-        if (routes->table[n].u1.ForwardType != MIB_IPROUTE_TYPE_DIRECT)
+        /* Check if this is a default route (there may be more than one) */
+        if (!routes->table[n].dwForwardDest)
+            ifdefault = ++default_routes;
+        else if (routes->table[n].u1.ForwardType != MIB_IPROUTE_TYPE_DIRECT)
             continue;
         ifindex = routes->table[n].dwForwardIfIndex;
         ifmetric = routes->table[n].dwForwardMetric1;
@@ -5999,13 +6009,14 @@ static struct WS_hostent* WS_get_local_ips( char *hostname )
             goto cleanup; /* Memory allocation error, fail gracefully */
         route_addrs[numroutes].interface = ifindex;
         route_addrs[numroutes].metric = ifmetric;
+        route_addrs[numroutes].default_route = ifdefault;
         /* If no IP is found in the next step (for whatever reason)
          * then fall back to the magic loopback address.
          */
         memcpy(&(route_addrs[numroutes].addr.s_addr), magic_loopback_addr, 4);
         numroutes++;
     }
-   if (numroutes == 0)
+    if (numroutes == 0)
        goto cleanup; /* No routes, fall back to the Magic IP */
     /* Find the IP address associated with each found interface */
     for (i = 0; i < numroutes; i++)
diff --git a/dlls/ws2_32/tests/sock.c b/dlls/ws2_32/tests/sock.c
index 00fac77..ce09053 100644
--- a/dlls/ws2_32/tests/sock.c
+++ b/dlls/ws2_32/tests/sock.c
@@ -4545,7 +4545,6 @@ static void test_gethostbyname(void)
             }
         }
     }
-todo_wine
     ok (found_default, "failed to find the first IP from gethostbyname!\n");
 
 cleanup:
-- 
2.6.2