QNativeSocketEngine: use sendmsg/recvmsg instead of sendto/recvfrom

We'll need to use these functions instead of the ones we're currently
using in order to access the ancillary data.

Note that on Windows the two functions aren't globals, but must be
obtained via ioctl, which means they can fail. If they do, we fall back
to using WSARecvFrom/WSASendTo

Change-Id: Iee8cbc07c4434ce9b560ffff13ca4284acd24132
Reviewed-by: Richard J. Moore <rich@kde.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/src/network/socket/qnativesocketengine_p.h b/src/network/socket/qnativesocketengine_p.h
index fb36ce6204..29063b3a85 100644
--- a/src/network/socket/qnativesocketengine_p.h
+++ b/src/network/socket/qnativesocketengine_p.h
@@ -51,6 +51,7 @@
 #  include <netinet/in.h>
 #else
 #  include <winsock2.h>
+#  include <mswsock.h>
 #endif
 
 QT_BEGIN_NAMESPACE
@@ -70,6 +71,36 @@ struct qt_sockaddr_storage {
 #ifdef Q_OS_WIN
 #define QT_SOCKLEN_T int
 #define QT_SOCKOPTLEN_T int
+
+// The following definitions are copied from the MinGW header mswsock.h which
+// was placed in the public domain. The WSASendMsg and WSARecvMsg functions
+// were introduced with Windows Vista, so some Win32 headers are lacking them.
+// There are no known versions of Windows CE or Embedded that contain them.
+#ifndef Q_OS_WINCE
+#  ifndef WSAID_WSARECVMSG
+typedef INT (WINAPI *LPFN_WSARECVMSG)(SOCKET s, LPWSAMSG lpMsg,
+                                      LPDWORD lpdwNumberOfBytesRecvd,
+                                      LPWSAOVERLAPPED lpOverlapped,
+                                      LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine);
+#    define WSAID_WSARECVMSG {0xf689d7c8,0x6f1f,0x436b,{0x8a,0x53,0xe5,0x4f,0xe3,0x51,0xc3,0x22}}
+#  endif
+#  ifndef WSAID_WSASENDMSG
+typedef struct {
+  LPWSAMSG lpMsg;
+  DWORD dwFlags;
+  LPDWORD lpNumberOfBytesSent;
+  LPWSAOVERLAPPED lpOverlapped;
+  LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine;
+} WSASENDMSG, *LPWSASENDMSG;
+
+typedef INT (WSAAPI *LPFN_WSASENDMSG)(SOCKET s, LPWSAMSG lpMsg, DWORD dwFlags,
+                                      LPDWORD lpNumberOfBytesSent,
+                                      LPWSAOVERLAPPED lpOverlapped,
+                                      LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine);
+
+#    define WSAID_WSASENDMSG {0xa441e712,0x754f,0x43ca,{0x84,0xa7,0x0d,0xee,0x44,0xcf,0x60,0x6d}}
+#  endif
+#endif
 #endif
 
 // sockaddr_in6 size changed between old and new SDK
@@ -185,6 +216,10 @@ public:
 
     QSocketNotifier *readNotifier, *writeNotifier, *exceptNotifier;
 
+#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE)
+    LPFN_WSASENDMSG sendmsg;
+    LPFN_WSARECVMSG recvmsg;
+#  endif
     enum ErrorString {
         NonBlockingInitFailedErrorString,
         BroadcastingInitFailedErrorString,