Add MulticastTtlOption and MulticastLoopbackOption to QAbstractSocket

These options only make sense and work in QUdpSocket when using
multicasting. Previously, the loopback was set when joining a multicast
group, but the loopback flag is not a per-group flag, it's per socket,
hence this change.

The ability to set the multicast TTL is needed as well, so this is added
as a socket option as well.

Autotest updated to test both.

1 files changed, 17 insertions, 2 deletions

diff --git a/src/network/socket/qnativesocketengine_win.cpp b/src/network/socket/qnativesocketengine_win.cpp
index d222fd1..d2479f3 100644
--- a/src/network/socket/qnativesocketengine_win.cpp
+++ b/src/network/socket/qnativesocketengine_win.cpp
@@ -401,7 +401,14 @@ int QNativeSocketEnginePrivate::option(QNativeSocketEngine::SocketOption opt) co
     case QNativeSocketEngine::KeepAliveOption:
         n = SO_KEEPALIVE;
         break;
-    case QNativeSocketEngine::MulticastLoopback:
+    case QNativeSocketEngine::MulticastTtlOption:
+        {
+            unsigned long val = 0;
+            if (WSAIoctl(socketDescriptor, SIO_MULTICAST_SCOPE, 0, 0, &val, sizeof(val), 0, 0 ,0) == 0)
+                return val;
+            return -1;
+        }
+    case QNativeSocketEngine::MulticastLoopbackOption:
         {
             unsigned long val = 0;
             if (WSAIoctl(socketDescriptor, SIO_MULTIPOINT_LOOPBACK, 0, 0, &val, sizeof(val), 0, 0, 0) == 0)
@@ -468,7 +475,15 @@ bool QNativeSocketEnginePrivate::setOption(QNativeSocketEngine::SocketOption opt
     case QNativeSocketEngine::KeepAliveOption:
         n = SO_KEEPALIVE;
         break;
-    case QNativeSocketEngine::MulticastLoopback:
+    case QNativeSocketEngine::MulticastTtlOption:
+        {
+            unsigned long val = v, outval;
+            if (WSAIoctl(socketDescriptor, SIO_MULTICAST_SCOPE, &val, sizeof(val), &outval, sizeof(outval), 0, 0, 0) == 0)
+                return true;
+            WS_ERROR_DEBUG(WSAGetLastError());
+            return false;
+        }
+    case QNativeSocketEngine::MulticastLoopbackOption:
         {
             unsigned long val = v, outval;
             if (WSAIoctl(socketDescriptor, SIO_MULTIPOINT_LOOPBACK, &val, sizeof(val), &outval, sizeof(outval), 0, 0, 0) == 0)