+/*

+ * Copyright (c) 2011 Tobias Markmann

+ * Licensed under the simplified BSD license.

+ * See Documentation/Licenses/BSD-simplified.txt for more information.

+ */

+

+#include "SOCKS5BytestreamClientSession.h"

+

+#include <boost/bind.hpp>

+

+#include <Swiften/Base/Algorithm.h>

+#include <Swiften/Base/SafeByteArray.h>

+#include <Swiften/Base/Concat.h>

+#include <Swiften/Base/Log.h>

+#include <Swiften/StringCodecs/SHA1.h>

+#include <Swiften/StringCodecs/Hexify.h>

+#include <Swiften/FileTransfer/BytestreamException.h>

+#include <Swiften/Network/TimerFactory.h>

+

+namespace Swift {

+

+SOCKS5BytestreamClientSession::SOCKS5BytestreamClientSession(boost::shared_ptr<Connection> connection, const HostAddressPort& addressPort, const std::string& destination, TimerFactory* timerFactory) :

+ connection(connection), addressPort(addressPort), destination(destination), state(Initial), chunkSize(131072) {

+ connection->onConnectFinished.connect(boost::bind(&SOCKS5BytestreamClientSession::handleConnectFinished, this, _1));

+ connection->onDisconnected.connect(boost::bind(&SOCKS5BytestreamClientSession::handleDisconnected, this, _1));

+ weFailedTimeout = timerFactory->createTimer(2000);

+ weFailedTimeout->onTick.connect(boost::bind(&SOCKS5BytestreamClientSession::handleWeFailedTimeout, this));

+}

+

+void SOCKS5BytestreamClientSession::start() {

+ assert(state == Initial);

+ SWIFT_LOG(debug) << "Trying to connect via TCP to " << addressPort.toString() << "." << std::endl;

+ weFailedTimeout->start();

+ connection->connect(addressPort);

+}

+

+void SOCKS5BytestreamClientSession::stop() {

+ connection->disconnect();

+ connection->onDataWritten.disconnect(boost::bind(&SOCKS5BytestreamClientSession::sendData, this));

+ connection->onDataRead.disconnect(boost::bind(&SOCKS5BytestreamClientSession::handleDataRead, this, _1));

+ readBytestream.reset();

+ state = Finished;

+}

+

+void SOCKS5BytestreamClientSession::process() {

+ SWIFT_LOG(debug) << "unprocessedData.size(): " << unprocessedData.size() << std::endl;

+ ByteArray bndAddress;

+ switch(state) {

+ case Initial:

+ hello();

+ break;

+ case Hello:

+ if (unprocessedData.size() > 1) {

+ unsigned char version = unprocessedData[0];

+ unsigned char authMethod = unprocessedData[1];

+ if (version != 5 || authMethod != 0) {

+ // signal failure to upper level

+ finish(true);

+ return;

+ }

+ unprocessedData.clear();

+ authenticate();

+ }

+ break;

+ case Authenticating:

+ if (unprocessedData.size() < 5) {

+ // need more data to start progressing

+ break;

+ }

+ if (unprocessedData[0] != '\x05') {

+ // wrong version

+ // disconnect & signal failure

+ finish(true);

+ break;

+ }

+ if (unprocessedData[1] != '\x00') {

+ // no success

+ // disconnect & signal failure

+ finish(true);

+ break;

+ }

+ if (unprocessedData[3] != '\x03') {

+ // we expect x'03' = DOMAINNAME here

+ // discconect & signal failure

+ finish(true);

+ break;

+ }

+ if (static_cast<size_t>(unprocessedData[4]) + 1 > unprocessedData.size() + 5) {

+ // complete domainname and port not available yet

+ break;

+ }

+ bndAddress = createByteArray(&(unprocessedData.data()[5]), unprocessedData[4]);

+ if (unprocessedData[unprocessedData[4] + 5] != 0 && bndAddress == createByteArray(destination)) {

+ // we expect a 0 as port

+ // disconnect and fail

+ finish(true);

+ }

+ unprocessedData.clear();

+ state = Ready;

+ SWIFT_LOG(debug) << "session ready" << std::endl;

+ // issue ready signal so the bytestream can be used for reading or writing

+ weFailedTimeout->stop();

+ onSessionReady(false);

+ break;

+ case Ready:

+ SWIFT_LOG(debug) << "Received further data in Ready state." << std::endl;

+ break;

+ case Reading:

+ case Writing:

+ case Finished:

+ SWIFT_LOG(debug) << "Unexpected receive of data. Current state: " << state << std::endl;

+ SWIFT_LOG(debug) << "Data: " << Hexify::hexify(unprocessedData) << std::endl;

+ unprocessedData.clear();

+ //assert(false);

+ }

+}

+

+void SOCKS5BytestreamClientSession::hello() {

+ // Version 5, 1 auth method, No authentication

+ const SafeByteArray hello = createSafeByteArray("\x05\x01\x00", 3);

+ connection->write(hello);

+ state = Hello;

+}

+

+void SOCKS5BytestreamClientSession::authenticate() {

+ SWIFT_LOG(debug) << std::endl;

+ SafeByteArray header = createSafeByteArray("\x05\x01\x00\x03", 4);

+ SafeByteArray message = header;

+ append(message, createSafeByteArray(destination.size()));

+ authenticateAddress = createByteArray(destination);

+ append(message, authenticateAddress);

+ append(message, createSafeByteArray("\x00\x00", 2)); // 2 byte for port

+ connection->write(message);

+ state = Authenticating;

+}

+

+void SOCKS5BytestreamClientSession::startReceiving(boost::shared_ptr<WriteBytestream> writeStream) {

+ if (state == Ready) {

+ state = Reading;

+ writeBytestream = writeStream;

+ writeBytestream->write(unprocessedData);

+ onBytesReceived(unprocessedData.size());

+ unprocessedData.clear();

+ } else {

+ SWIFT_LOG(debug) << "Session isn't ready for transfer yet!" << std::endl;

+ }

+}

+

+void SOCKS5BytestreamClientSession::startSending(boost::shared_ptr<ReadBytestream> readStream) {

+ if (state == Ready) {

+ state = Writing;

+ readBytestream = readStream;

+ connection->onDataWritten.connect(boost::bind(&SOCKS5BytestreamClientSession::sendData, this));

+ sendData();

+ } else {

+ SWIFT_LOG(debug) << "Session isn't ready for transfer yet!" << std::endl;

+ }

+}

+

+HostAddressPort SOCKS5BytestreamClientSession::getAddressPort() const {

+ return addressPort;

+}

+

+void SOCKS5BytestreamClientSession::sendData() {

+ if (!readBytestream->isFinished()) {

+ try {

+ SafeByteArray dataToSend = createSafeByteArray(readBytestream->read(chunkSize));

+ connection->write(dataToSend);

+ onBytesSent(dataToSend.size());

+ }

+ catch (const BytestreamException&) {

+ finish(true);

+ }

+ }

+ else {

+ finish(false);

+ }

+}

+

+void SOCKS5BytestreamClientSession::finish(bool error) {

+ weFailedTimeout->stop();

+ connection->disconnect();

+ connection->onDataWritten.disconnect(boost::bind(&SOCKS5BytestreamClientSession::sendData, this));

+ connection->onDataRead.disconnect(boost::bind(&SOCKS5BytestreamClientSession::handleDataRead, this, _1));

+ readBytestream.reset();

+ if (state == Initial || state == Hello || state == Authenticating) {

+ onSessionReady(true);

+ }

+ else {

+ state = Finished;

+ if (error) {

+ onFinished(boost::optional<FileTransferError>(FileTransferError::ReadError));

+ } else {

+ onFinished(boost::optional<FileTransferError>());

+ }

+ }

+}

+

+void SOCKS5BytestreamClientSession::handleConnectFinished(bool error) {

+ if (error) {

+ SWIFT_LOG(debug) << "Failed to connect via TCP to " << addressPort.toString() << "." << std::endl;

+ finish(true);

+ } else {

+ SWIFT_LOG(debug) << "Successfully connected via TCP" << addressPort.toString() << "." << std::endl;

+ weFailedTimeout->start();

+ connection->onDataRead.connect(boost::bind(&SOCKS5BytestreamClientSession::handleDataRead, this, _1));

+ process();

+ }

+}

+

+void SOCKS5BytestreamClientSession::handleDataRead(const SafeByteArray& data) {

+ SWIFT_LOG(debug) << "state: " << state << " data.size() = " << data.size() << std::endl;

+ if (state != Reading) {

+ append(unprocessedData, data);

+ process();

+ }

+ else {

+ writeBytestream->write(createByteArray(data.data(), data.size()));

+ onBytesReceived(data.size());

+ }

+}

+

+void SOCKS5BytestreamClientSession::handleDisconnected(const boost::optional<Connection::Error>& error) {

+ SWIFT_LOG(debug) << (error ? (error == Connection::ReadError ? "Read Error" : "Write Error") : "No Error") << std::endl;

+ if (error) {

+ finish(true);

+ }

+}

+

+void SOCKS5BytestreamClientSession::handleWeFailedTimeout() {

+ SWIFT_LOG(debug) << "Failed due to timeout!" << std::endl;

+ finish(true);

+}

+

+}