winrt: Add support for Windows Information Protection

Windows Information Protection is used for splitting corporate and
personal data, requiring connections to be established in a different
way instantiating ThreadNetworkContext.

Usage is enabled via the QT_WINRT_USE_THREAD_NETWORK_CONTEXT environment
variable.

Change-Id: I3aaa097b66fc616d42cd05a1e20bbcb004f6e467
Reviewed-by: James Tong
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 9 insertions, 4 deletions

diff --git a/src/network/socket/qabstractsocket.cpp b/src/network/socket/qabstractsocket.cpp
index 02bba2d293..57c40194a3 100644
--- a/src/network/socket/qabstractsocket.cpp
+++ b/src/network/socket/qabstractsocket.cpp
@@ -1113,10 +1113,15 @@ void QAbstractSocketPrivate::_q_connectToNextAddress()
         // Tries to connect to the address. If it succeeds immediately
         // (localhost address on BSD or any UDP connect), emit
         // connected() and return.
-        if (socketEngine->connectToHost(host, port)) {
-            //_q_testConnection();
-            fetchConnectionParameters();
-            return;
+        if (
+#if defined(Q_OS_WINRT) && _MSC_VER >= 1900
+            !qEnvironmentVariableIsEmpty("QT_WINRT_USE_THREAD_NETWORK_CONTEXT") ?
+                socketEngine->connectToHostByName(hostName, port) :
+#endif
+            socketEngine->connectToHost(host, port)) {
+                //_q_testConnection();
+                fetchConnectionParameters();
+                return;
         }
 
         // Check that we're in delayed connection state. If not, try