Netif (Haiku): add preferred source addr

Author: CarterLi

src/common/netif/netif_haiku.c

@@ -41,9 +41,11 @@ bool ffNetifGetDefaultRouteImplV4(FFNetifDefaultRouteResult* result)
 
     while (interface < end) {
         if (interface->ifr_route.flags & RTF_DEFAULT) {
+            // interface->ifr_metric?
             strlcpy(result->ifName, interface->ifr_name, IF_NAMESIZE);
             result->ifIndex = if_nametoindex(interface->ifr_name);
-            // TODO: Get the preferred source address
+            if (interface->ifr_route.source)
+                result->preferredSourceAddrV4 = ((struct sockaddr_in*)interface->ifr_route.source)->sin_addr.s_addr;
             return true;
         }
 
@@ -55,15 +57,56 @@ bool ffNetifGetDefaultRouteImplV4(FFNetifDefaultRouteResult* result)
         if (interface->ifr_route.gateway != NULL)
             addressSize += interface->ifr_route.gateway->sa_len;
 
-        interface = (struct ifreq*)((addr_t)interface + IF_NAMESIZE
-            + sizeof(struct route_entry) + addressSize);
+        interface = (struct ifreq*)((addr_t)interface + IF_NAMESIZE + sizeof(struct route_entry) + addressSize);
     }
 
     return false;
 }
 
 bool ffNetifGetDefaultRouteImplV6(FFNetifDefaultRouteResult* result)
 {
-    // TODO: AF_INET6
+    FF_AUTO_CLOSE_FD int pfRoute = socket(AF_INET, SOCK_RAW, AF_INET6);
+    if (pfRoute < 0)
+        return false;
+
+    struct ifconf config;
+    config.ifc_len = sizeof(config.ifc_value);
+    if (ioctl(pfRoute, SIOCGRTSIZE, &config, sizeof(struct ifconf)) < 0)
+        return false;
+
+    int size = config.ifc_value;
+    if (size <= 0)
+        return false;
+
+    FF_AUTO_FREE void *buffer = malloc((size_t) size);
+    if (buffer == NULL) {
+        return false;
+    }
+
+    config.ifc_len = size;
+    config.ifc_buf = buffer;
+    if (ioctl(pfRoute, SIOCGRTTABLE, &config, sizeof(struct ifconf)) < 0)
+        return false;
+
+    struct ifreq *interface = (struct ifreq*)buffer;
+    struct ifreq *end = (struct ifreq*)((uint8_t*)buffer + size);
+
+    while (interface < end) {
+        if (interface->ifr_route.flags & RTF_DEFAULT) {
+            strlcpy(result->ifName, interface->ifr_name, IF_NAMESIZE);
+            result->ifIndex = if_nametoindex(interface->ifr_name);
+            return true;
+        }
+
+        size_t addressSize = 0;
+        if (interface->ifr_route.destination != NULL)
+            addressSize += interface->ifr_route.destination->sa_len;
+        if (interface->ifr_route.mask != NULL)
+            addressSize += interface->ifr_route.mask->sa_len;
+        if (interface->ifr_route.gateway != NULL)
+            addressSize += interface->ifr_route.gateway->sa_len;
+
+        interface = (struct ifreq*)((addr_t)interface + IF_NAMESIZE + sizeof(struct route_entry) + addressSize);
+    }
     return false;
 }