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// Copyright 2005-2019 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#include "Connection.h"
#include "Message.h"
#include "SSL.h"
#include "Mumble.pb.h"
#include <QtCore/QtEndian>
#include <QtNetwork/QHostAddress>
#ifdef Q_OS_WIN
# include <qos2.h>
#else
# include <sys/socket.h>
# include <sys/types.h>
# include <netinet/in.h>
# include <netinet/tcp.h>
#endif
#ifdef Q_OS_WIN
HANDLE Connection::hQoS = NULL;
#endif
Connection::Connection(QObject *p, QSslSocket *qtsSock) : QObject(p) {
qtsSocket = qtsSock;
qtsSocket->setParent(this);
iPacketLength = -1;
bDisconnectedEmitted = false;
static bool bDeclared = false;
if (! bDeclared) {
bDeclared = true;
qRegisterMetaType<QAbstractSocket::SocketError>("QAbstractSocket::SocketError");
}
connect(qtsSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(socketError(QAbstractSocket::SocketError)));
connect(qtsSocket, SIGNAL(encrypted()), this, SIGNAL(encrypted()));
connect(qtsSocket, SIGNAL(readyRead()), this, SLOT(socketRead()));
connect(qtsSocket, SIGNAL(disconnected()), this, SLOT(socketDisconnected()));
connect(qtsSocket, SIGNAL(sslErrors(const QList<QSslError> &)), this, SLOT(socketSslErrors(const QList<QSslError> &)));
qtLastPacket.restart();
#ifdef Q_OS_WIN
dwFlow = 0;
#endif
}
Connection::~Connection() {
#ifdef Q_OS_WIN
if (dwFlow && hQoS) {
if (! QOSRemoveSocketFromFlow(hQoS, 0, dwFlow, 0))
qWarning("Connection: Failed to remove flow from QoS");
}
#endif
}
void Connection::setToS() {
#if defined(Q_OS_WIN)
if (dwFlow || ! hQoS)
return;
dwFlow = 0;
if (! QOSAddSocketToFlow(hQoS, qtsSocket->socketDescriptor(), NULL, QOSTrafficTypeAudioVideo, QOS_NON_ADAPTIVE_FLOW, reinterpret_cast<PQOS_FLOWID>(&dwFlow)))
qWarning("Connection: Failed to add flow to QOS");
#elif defined(Q_OS_UNIX)
int val = 0xa0;
if (setsockopt(static_cast<int>(qtsSocket->socketDescriptor()), IPPROTO_IP, IP_TOS, &val, sizeof(val))) {
val = 0x60;
if (setsockopt(static_cast<int>(qtsSocket->socketDescriptor()), IPPROTO_IP, IP_TOS, &val, sizeof(val)))
qWarning("Connection: Failed to set TOS for TCP Socket");
}
#if defined(SO_PRIORITY)
socklen_t optlen = sizeof(val);
if (getsockopt(static_cast<int>(qtsSocket->socketDescriptor()), SOL_SOCKET, SO_PRIORITY, &val, &optlen) == 0) {
if (val == 0) {
val = 6;
setsockopt(static_cast<int>(qtsSocket->socketDescriptor()), SOL_SOCKET, SO_PRIORITY, &val, sizeof(val));
}
}
#endif
#endif
}
qint64 Connection::activityTime() const {
return qtLastPacket.elapsed();
}
void Connection::resetActivityTime() {
qtLastPacket.restart();
}
/**
* This function waits until a complete package is received and then emits it as a message.
* It gets called everytime new data is available and interprets the message prefix header
* to figure out the type and length. It then waits until the complete message is buffered
* and emits it as a message so it can be handled by the corresponding message handler
* routine.
*
* @see QSslSocket::readyRead()
* @see void ServerHandler::message(unsigned int msgType, const QByteArray &qbaMsg)
* @see void Server::message(unsigned int uiType, const QByteArray &qbaMsg, ServerUser *u)
*/
void Connection::socketRead() {
while (true) {
qint64 iAvailable = qtsSocket->bytesAvailable();
if (iPacketLength == -1) {
if (iAvailable < 6)
return;
unsigned char a_ucBuffer[6];
qtsSocket->read(reinterpret_cast<char *>(a_ucBuffer), 6);
uiType = qFromBigEndian<quint16>(&a_ucBuffer[0]);
iPacketLength = qFromBigEndian<quint32>(&a_ucBuffer[2]);
iAvailable -= 6;
}
if ((iPacketLength == -1) || (iAvailable < iPacketLength))
return;
if (iPacketLength > 0x7fffff) {
qWarning() << "Host tried to send huge packet";
disconnectSocket(true);
return;
}
QByteArray qbaBuffer = qtsSocket->read(iPacketLength);
iPacketLength = -1;
iAvailable -= iPacketLength;
emit message(uiType, qbaBuffer);
}
}
void Connection::socketError(QAbstractSocket::SocketError err) {
emit connectionClosed(err, qtsSocket->errorString());
}
void Connection::socketSslErrors(const QList<QSslError> &qlErr) {
emit handleSslErrors(qlErr);
}
void Connection::proceedAnyway() {
qtsSocket->ignoreSslErrors();
}
void Connection::socketDisconnected() {
emit connectionClosed(QAbstractSocket::UnknownSocketError, QString());
}
void Connection::messageToNetwork(const ::google::protobuf::Message &msg, unsigned int msgType, QByteArray &cache) {
int len = msg.ByteSize();
if (len > 0x7fffff)
return;
cache.resize(len + 6);
unsigned char *uc = reinterpret_cast<unsigned char *>(cache.data());
qToBigEndian<quint16>(static_cast<quint16>(msgType), & uc[0]);
qToBigEndian<quint32>(len, & uc[2]);
msg.SerializeToArray(uc + 6, len);
}
void Connection::sendMessage(const ::google::protobuf::Message &msg, unsigned int msgType, QByteArray &cache) {
if (cache.isEmpty()) {
messageToNetwork(msg, msgType, cache);
}
sendMessage(cache);
}
void Connection::sendMessage(const QByteArray &qbaMsg) {
if (! qbaMsg.isEmpty())
qtsSocket->write(qbaMsg);
}
void Connection::forceFlush() {
if (qtsSocket->state() != QAbstractSocket::ConnectedState)
return;
if (! qtsSocket->isEncrypted())
return;
int nodelay;
qtsSocket->flush();
nodelay = 1;
setsockopt(static_cast<int>(qtsSocket->socketDescriptor()), IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char *>(&nodelay), static_cast<socklen_t>(sizeof(nodelay)));
nodelay = 0;
setsockopt(static_cast<int>(qtsSocket->socketDescriptor()), IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char *>(&nodelay), static_cast<socklen_t>(sizeof(nodelay)));
}
void Connection::disconnectSocket(bool force) {
if (qtsSocket->state() == QAbstractSocket::UnconnectedState) {
emit connectionClosed(QAbstractSocket::UnknownSocketError, QString());
return;
}
if (force)
qtsSocket->abort();
else
qtsSocket->disconnectFromHost();
}
QHostAddress Connection::peerAddress() const {
return qtsSocket->peerAddress();
}
quint16 Connection::peerPort() const {
return qtsSocket->peerPort();
}
QHostAddress Connection::localAddress() const {
return qtsSocket->localAddress();
}
quint16 Connection::localPort() const {
return qtsSocket->localPort();
}
QList<QSslCertificate> Connection::peerCertificateChain() const {
const QSslCertificate cert = qtsSocket->peerCertificate();
if (cert.isNull())
return QList<QSslCertificate>();
else
return qtsSocket->peerCertificateChain() << cert;
}
QSslCipher Connection::sessionCipher() const {
return qtsSocket->sessionCipher();
}
QSsl::SslProtocol Connection::sessionProtocol() const {
#if QT_VERSION >= 0x050400
return qtsSocket->sessionProtocol();
#else
return QSsl::UnknownProtocol; // Cannot determine session cipher. We only know it's some TLS variant
#endif
}
QString Connection::sessionProtocolString() const {
#if QT_VERSION >= 0x050400
return MumbleSSL::protocolToString(sessionProtocol());
#else
return QLatin1String("TLS"); // Cannot determine session cipher. We only know it's some TLS variant
#endif
}
#ifdef Q_OS_WIN
void Connection::setQoS(HANDLE hParentQoS) {
hQoS = hParentQoS;
}
#endif
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