diff options
Diffstat (limited to 'src/network/socket/qnativesocketengine_win.cpp')
| -rw-r--r-- | src/network/socket/qnativesocketengine_win.cpp | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/src/network/socket/qnativesocketengine_win.cpp b/src/network/socket/qnativesocketengine_win.cpp index a1f7f36700..6a091209be 100644 --- a/src/network/socket/qnativesocketengine_win.cpp +++ b/src/network/socket/qnativesocketengine_win.cpp @@ -944,9 +944,7 @@ static bool multicastMembershipHelper(QNativeSocketEnginePrivate *d, Q_IPV6ADDR ip6 = groupAddress.toIPv6Address(); memcpy(&mreq6.ipv6mr_multiaddr, &ip6, sizeof(ip6)); mreq6.ipv6mr_interface = iface.index(); - } else - - if (groupAddress.protocol() == QAbstractSocket::IPv4Protocol) { + } else if (groupAddress.protocol() == QAbstractSocket::IPv4Protocol) { level = IPPROTO_IP; sockOpt = how4; sockArg = reinterpret_cast<char *>(&mreq4); @@ -1148,10 +1146,10 @@ qint64 QNativeSocketEnginePrivate::nativePendingDatagramSize() const DWORD bufferCount = 5; WSABUF * buf = 0; for (;;) { - // the data written to udpMessagePeekBuffer is discarded, so - // this function is still reentrant although it might not look - // so. - static char udpMessagePeekBuffer[8192]; + // We start at 1500 bytes (the MTU for Ethernet V2), which should catch + // almost all uses (effective MTU for UDP under IPv4 is 1468), except + // for localhost datagrams and those reassembled by the IP layer. + char udpMessagePeekBuffer[1500]; buf = new WSABUF[bufferCount]; for (DWORD i=0; i<bufferCount; i++) { @@ -1321,6 +1319,9 @@ qint64 QNativeSocketEnginePrivate::nativeSendDatagram(const char *data, qint64 l setPortAndAddress(header.destinationPort, header.destinationAddress, &aa, &msg.namelen); + uint oldIfIndex = 0; + bool mustSetIpv6MulticastIf = false; + if (msg.namelen == sizeof(aa.a6)) { // sending IPv6 if (header.hopLimit != -1) { @@ -1332,7 +1333,7 @@ qint64 QNativeSocketEnginePrivate::nativeSendDatagram(const char *data, qint64 l cmsgptr = reinterpret_cast<WSACMSGHDR *>(reinterpret_cast<char *>(cmsgptr) + WSA_CMSG_SPACE(sizeof(int))); } - if (header.ifindex != 0 || !header.senderAddress.isNull()) { + if (!header.senderAddress.isNull()) { struct in6_pktinfo *data = reinterpret_cast<in6_pktinfo *>(WSA_CMSG_DATA(cmsgptr)); memset(data, 0, sizeof(*data)); msg.Control.len += WSA_CMSG_SPACE(sizeof(*data)); @@ -1345,6 +1346,21 @@ qint64 QNativeSocketEnginePrivate::nativeSendDatagram(const char *data, qint64 l memcpy(&data->ipi6_addr, &tmp, sizeof(tmp)); cmsgptr = reinterpret_cast<WSACMSGHDR *>(reinterpret_cast<char *>(cmsgptr) + WSA_CMSG_SPACE(sizeof(*data))); + } else if (header.ifindex != 0) { + // Unlike other operating systems, setting the interface index in the in6_pktinfo + // structure above and leaving the ipi6_addr set to :: will cause the packets to be + // sent with source address ::. So we have to use IPV6_MULTICAST_IF, which MSDN is + // quite clear that "This option does not change the default interface for receiving + // IPv6 multicast traffic." + QT_SOCKOPTLEN_T len = sizeof(oldIfIndex); + if (::getsockopt(socketDescriptor, IPPROTO_IPV6, IPV6_MULTICAST_IF, + reinterpret_cast<char *>(&oldIfIndex), &len) == -1 + || ::setsockopt(socketDescriptor, IPPROTO_IPV6, IPV6_MULTICAST_IF, + reinterpret_cast<const char *>(&header.ifindex), sizeof(header.ifindex)) == -1) { + setError(QAbstractSocket::NetworkError, SendDatagramErrorString); + return -1; + } + mustSetIpv6MulticastIf = true; } } else { // sending IPv4 @@ -1398,6 +1414,12 @@ qint64 QNativeSocketEnginePrivate::nativeSendDatagram(const char *data, qint64 l ret = qint64(bytesSent); } + if (mustSetIpv6MulticastIf) { + // undo what we did above + ::setsockopt(socketDescriptor, IPPROTO_IPV6, IPV6_MULTICAST_IF, + reinterpret_cast<char *>(&oldIfIndex), sizeof(oldIfIndex)); + } + #if defined (QNATIVESOCKETENGINE_DEBUG) qDebug("QNativeSocketEnginePrivate::nativeSendDatagram(%p \"%s\", %lli, \"%s\", %i) == %lli", data, qt_prettyDebug(data, qMin<qint64>(len, 16), len).data(), len, |