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/*
* Copyright (c) 2010-2018 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swiften/FileTransfer/SOCKS5BytestreamServerSession.h>
#include <boost/bind.hpp>
#include <boost/numeric/conversion/cast.hpp>
#include <Swiften/Base/Algorithm.h>
#include <Swiften/Base/ByteArray.h>
#include <Swiften/Base/Concat.h>
#include <Swiften/Base/Log.h>
#include <Swiften/Base/SafeByteArray.h>
#include <Swiften/FileTransfer/BytestreamException.h>
#include <Swiften/FileTransfer/SOCKS5BytestreamRegistry.h>
#include <Swiften/Network/HostAddressPort.h>
namespace Swift {
SOCKS5BytestreamServerSession::SOCKS5BytestreamServerSession(
std::shared_ptr<Connection> connection,
SOCKS5BytestreamRegistry* bytestreams) :
connection(connection),
bytestreams(bytestreams),
state(Initial),
chunkSize(131072),
waitingForData(false) {
disconnectedConnection = connection->onDisconnected.connect(boost::bind(&SOCKS5BytestreamServerSession::handleDisconnected, this, _1));
}
SOCKS5BytestreamServerSession::~SOCKS5BytestreamServerSession() {
if (state != Finished && state != Initial) {
SWIFT_LOG(warning) << "SOCKS5BytestreamServerSession unfinished" << std::endl;
finish();
}
}
void SOCKS5BytestreamServerSession::start() {
SWIFT_LOG(debug) << std::endl;
dataReadConnection = connection->onDataRead.connect(
boost::bind(&SOCKS5BytestreamServerSession::handleDataRead, this, _1));
state = WaitingForAuthentication;
}
void SOCKS5BytestreamServerSession::stop() {
finish();
}
void SOCKS5BytestreamServerSession::startSending(std::shared_ptr<ReadBytestream> stream) {
if (state != ReadyForTransfer) { SWIFT_LOG(debug) << "Not ready for transfer!" << std::endl; return; }
readBytestream = stream;
state = WritingData;
dataAvailableConnection = readBytestream->onDataAvailable.connect(
boost::bind(&SOCKS5BytestreamServerSession::handleDataAvailable, this));
dataWrittenConnection = connection->onDataWritten.connect(
boost::bind(&SOCKS5BytestreamServerSession::sendData, this));
sendData();
}
void SOCKS5BytestreamServerSession::startReceiving(std::shared_ptr<WriteBytestream> stream) {
if (state != ReadyForTransfer) { SWIFT_LOG(debug) << "Not ready for transfer!" << std::endl; return; }
writeBytestream = stream;
state = ReadingData;
writeBytestream->write(unprocessedData);
// onBytesReceived(unprocessedData.size());
unprocessedData.clear();
}
HostAddressPort SOCKS5BytestreamServerSession::getAddressPort() const {
return connection->getLocalAddress();
}
void SOCKS5BytestreamServerSession::handleDataRead(std::shared_ptr<SafeByteArray> data) {
if (state != ReadingData) {
append(unprocessedData, *data);
process();
} else {
if (!writeBytestream->write(createByteArray(vecptr(*data), data->size()))) {
finish(boost::optional<FileTransferError>(FileTransferError::WriteError));
}
}
}
void SOCKS5BytestreamServerSession::handleDataAvailable() {
if (waitingForData) {
sendData();
}
}
void SOCKS5BytestreamServerSession::handleDisconnected(const boost::optional<Connection::Error>& error) {
SWIFT_LOG(debug) << (error ? (error == Connection::ReadError ? "Read Error" : "Write Error") : "No Error") << std::endl;
finish(error ? boost::optional<FileTransferError>(FileTransferError::PeerError) : boost::optional<FileTransferError>());
}
void SOCKS5BytestreamServerSession::process() {
if (state == WaitingForAuthentication) {
if (unprocessedData.size() >= 2) {
size_t authCount = unprocessedData[1];
size_t i = 2;
while (i < 2 + authCount && i < unprocessedData.size()) {
// Skip authentication mechanism
++i;
}
if (i == 2 + authCount) {
// Authentication message is complete
if (i != unprocessedData.size()) {
SWIFT_LOG(debug) << "Junk after authentication mechanism" << std::endl;
}
unprocessedData.clear();
connection->write(createSafeByteArray("\x05\x00", 2));
state = WaitingForRequest;
}
}
}
else if (state == WaitingForRequest) {
if (unprocessedData.size() >= 5) {
ByteArray requestID;
size_t i = 5;
size_t hostnameSize = unprocessedData[4];
while (i < 5 + hostnameSize && i < unprocessedData.size()) {
requestID.push_back(unprocessedData[i]);
++i;
}
// Skip the port: 2 byte large, one already skipped. Add one for comparison with size
i += 2;
if (i <= unprocessedData.size()) {
if (i != unprocessedData.size()) {
SWIFT_LOG(debug) << "Junk after authentication mechanism" << std::endl;
}
unprocessedData.clear();
streamID = byteArrayToString(requestID);
bool hasBytestream = bytestreams->hasBytestream(streamID);
SafeByteArray result = createSafeByteArray("\x05", 1);
result.push_back(hasBytestream ? 0x0 : 0x4);
append(result, createByteArray("\x00\x03", 2));
try {
result.push_back(boost::numeric_cast<unsigned char>(requestID.size()));
}
catch (const boost::numeric::bad_numeric_cast& e) {
SWIFT_LOG(warning) << "SOCKS5 request ID is too long (" << requestID.size() << "): " << e.what() << std::endl;
finish();
return;
}
append(result, concat(requestID, createByteArray("\x00\x00", 2)));
if (!hasBytestream) {
SWIFT_LOG(debug) << "Readstream or Wrtiestream with ID " << streamID << " not found!" << std::endl;
connection->write(result);
finish(boost::optional<FileTransferError>(FileTransferError::PeerError));
}
else {
SWIFT_LOG(debug) << "Found stream. Sent OK." << std::endl;
connection->write(result);
state = ReadyForTransfer;
}
}
}
}
}
void SOCKS5BytestreamServerSession::sendData() {
if (!readBytestream->isFinished()) {
try {
SafeByteArray dataToSend = createSafeByteArray(*readBytestream->read(boost::numeric_cast<size_t>(chunkSize)));
if (!dataToSend.empty()) {
connection->write(dataToSend);
onBytesSent(dataToSend.size());
waitingForData = false;
}
else {
waitingForData = true;
}
}
catch (const BytestreamException&) {
finish(boost::optional<FileTransferError>(FileTransferError::PeerError));
}
}
else {
finish();
}
}
void SOCKS5BytestreamServerSession::finish(const boost::optional<FileTransferError>& error) {
SWIFT_LOG(debug) << "state: " << state << std::endl;
if (state == Finished) {
return;
}
disconnectedConnection.disconnect();
dataReadConnection.disconnect();
dataWrittenConnection.disconnect();
dataAvailableConnection.disconnect();
readBytestream.reset();
state = Finished;
onFinished(error);
}
}
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Swift