mirror of https://github.com/NekoX-Dev/NekoX.git
439 lines
16 KiB
C++
439 lines
16 KiB
C++
/*
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* This is the source code of tgnet library v. 1.0
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* It is licensed under GNU GPL v. 2 or later.
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* You should have received a copy of the license in this archive (see LICENSE).
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*
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* Copyright Nikolai Kudashov, 2015.
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*/
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#include <openssl/rand.h>
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#include <stdlib.h>
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#include "Connection.h"
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#include "ConnectionsManager.h"
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#include "BuffersStorage.h"
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#include "FileLog.h"
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#include "Timer.h"
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#include "Datacenter.h"
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#include "NativeByteBuffer.h"
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static uint32_t lastConnectionToken = 1;
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Connection::Connection(Datacenter *datacenter, ConnectionType type) {
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currentDatacenter = datacenter;
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connectionType = type;
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genereateNewSessionId();
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connectionState = TcpConnectionStageIdle;
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reconnectTimer = new Timer([&] {
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reconnectTimer->stop();
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connect();
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});
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}
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Connection::~Connection() {
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if (reconnectTimer != nullptr) {
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reconnectTimer->stop();
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delete reconnectTimer;
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reconnectTimer = nullptr;
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}
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}
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void Connection::suspendConnection() {
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reconnectTimer->stop();
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if (connectionState == TcpConnectionStageIdle || connectionState == TcpConnectionStageSuspended) {
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return;
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}
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DEBUG_D("connection(%p, dc%u, type %d) suspend", this, currentDatacenter->getDatacenterId(), connectionType);
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connectionState = TcpConnectionStageSuspended;
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dropConnection();
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ConnectionsManager::getInstance().onConnectionClosed(this);
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firstPacketSent = false;
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if (restOfTheData != nullptr) {
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restOfTheData->reuse();
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restOfTheData = nullptr;
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}
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lastPacketLength = 0;
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connectionToken = 0;
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wasConnected = false;
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}
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void Connection::onReceivedData(NativeByteBuffer *buffer) {
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AES_ctr128_encrypt(buffer->bytes(), buffer->bytes(), buffer->limit(), &decryptKey, decryptIv, decryptCount, &decryptNum);
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failedConnectionCount = 0;
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NativeByteBuffer *parseLaterBuffer = nullptr;
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if (restOfTheData != nullptr) {
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if (lastPacketLength == 0) {
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if (restOfTheData->capacity() - restOfTheData->position() >= buffer->limit()) {
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restOfTheData->limit(restOfTheData->position() + buffer->limit());
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restOfTheData->writeBytes(buffer);
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buffer = restOfTheData;
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} else {
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NativeByteBuffer *newBuffer = BuffersStorage::getInstance().getFreeBuffer(restOfTheData->limit() + buffer->limit());
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restOfTheData->rewind();
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newBuffer->writeBytes(restOfTheData);
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newBuffer->writeBytes(buffer);
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buffer = newBuffer;
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restOfTheData->reuse();
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restOfTheData = newBuffer;
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}
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} else {
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uint32_t len;
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if (lastPacketLength - restOfTheData->position() <= buffer->limit()) {
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len = lastPacketLength - restOfTheData->position();
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} else {
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len = buffer->limit();
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}
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uint32_t oldLimit = buffer->limit();
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buffer->limit(len);
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restOfTheData->writeBytes(buffer);
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buffer->limit(oldLimit);
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if (restOfTheData->position() == lastPacketLength) {
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parseLaterBuffer = buffer->hasRemaining() ? buffer : nullptr;
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buffer = restOfTheData;
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} else {
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return;
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}
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}
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}
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buffer->rewind();
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while (buffer->hasRemaining()) {
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if (!hasSomeDataSinceLastConnect) {
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currentDatacenter->storeCurrentAddressAndPortNum();
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isTryingNextPort = false;
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if (connectionType == ConnectionTypePush) {
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setTimeout(60 * 15);
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} else {
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setTimeout(25);
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}
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}
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hasSomeDataSinceLastConnect = true;
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uint32_t currentPacketLength = 0;
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uint32_t mark = buffer->position();
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uint8_t fByte = buffer->readByte(nullptr);
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if ((fByte & (1 << 7)) != 0) {
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buffer->position(mark);
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if (buffer->remaining() < 4) {
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NativeByteBuffer *reuseLater = restOfTheData;
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restOfTheData = BuffersStorage::getInstance().getFreeBuffer(16384);
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restOfTheData->writeBytes(buffer);
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restOfTheData->limit(restOfTheData->position());
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lastPacketLength = 0;
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if (reuseLater != nullptr) {
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reuseLater->reuse();
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}
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break;
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}
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int32_t ackId = buffer->readBigInt32(nullptr) & (~(1 << 31));
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ConnectionsManager::getInstance().onConnectionQuickAckReceived(this, ackId);
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continue;
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}
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if (fByte != 0x7f) {
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currentPacketLength = ((uint32_t) fByte) * 4;
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} else {
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buffer->position(mark);
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if (buffer->remaining() < 4) {
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if (restOfTheData == nullptr || (restOfTheData != nullptr && restOfTheData->position() != 0)) {
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NativeByteBuffer *reuseLater = restOfTheData;
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restOfTheData = BuffersStorage::getInstance().getFreeBuffer(16384);
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restOfTheData->writeBytes(buffer);
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restOfTheData->limit(restOfTheData->position());
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lastPacketLength = 0;
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if (reuseLater != nullptr) {
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reuseLater->reuse();
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}
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} else {
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restOfTheData->position(restOfTheData->limit());
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}
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break;
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}
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currentPacketLength = ((uint32_t) buffer->readInt32(nullptr) >> 8) * 4;
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}
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if (currentPacketLength % 4 != 0 || currentPacketLength > 2 * 1024 * 1024) {
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DEBUG_E("connection(%p, dc%u, type %d) received invalid packet length", this, currentDatacenter->getDatacenterId(), connectionType);
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reconnect();
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return;
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}
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if (currentPacketLength < buffer->remaining()) {
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DEBUG_E("connection(%p, dc%u, type %d) received message len %u but packet larger %u", this, currentDatacenter->getDatacenterId(), connectionType, currentPacketLength, buffer->remaining());
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} else if (currentPacketLength == buffer->remaining()) {
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DEBUG_E("connection(%p, dc%u, type %d) received message len %u equal to packet size", this, currentDatacenter->getDatacenterId(), connectionType, currentPacketLength);
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} else {
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DEBUG_E("connection(%p, dc%u, type %d) received packet size less(%u) then message size(%u)", this, currentDatacenter->getDatacenterId(), connectionType, buffer->remaining(), currentPacketLength);
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NativeByteBuffer *reuseLater = nullptr;
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uint32_t len = currentPacketLength + (fByte != 0x7f ? 1 : 4);
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if (restOfTheData != nullptr && restOfTheData->capacity() < len) {
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reuseLater = restOfTheData;
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restOfTheData = nullptr;
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}
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if (restOfTheData == nullptr) {
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buffer->position(mark);
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restOfTheData = BuffersStorage::getInstance().getFreeBuffer(len);
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restOfTheData->writeBytes(buffer);
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} else {
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restOfTheData->position(restOfTheData->limit());
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restOfTheData->limit(len);
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}
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lastPacketLength = len;
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if (reuseLater != nullptr) {
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reuseLater->reuse();
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}
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return;
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}
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uint32_t old = buffer->limit();
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buffer->limit(buffer->position() + currentPacketLength);
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ConnectionsManager::getInstance().onConnectionDataReceived(this, buffer, currentPacketLength);
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buffer->position(buffer->limit());
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buffer->limit(old);
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if (restOfTheData != nullptr) {
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if ((lastPacketLength != 0 && restOfTheData->position() == lastPacketLength) || (lastPacketLength == 0 && !restOfTheData->hasRemaining())) {
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restOfTheData->reuse();
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restOfTheData = nullptr;
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} else {
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DEBUG_E("compact occured");
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restOfTheData->compact();
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restOfTheData->limit(restOfTheData->position());
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restOfTheData->position(0);
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}
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}
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if (parseLaterBuffer != nullptr) {
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buffer = parseLaterBuffer;
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parseLaterBuffer = nullptr;
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}
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}
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}
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void Connection::connect() {
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if (!ConnectionsManager::getInstance().isNetworkAvailable()) {
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ConnectionsManager::getInstance().onConnectionClosed(this);
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return;
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}
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if ((connectionState == TcpConnectionStageConnected || connectionState == TcpConnectionStageConnecting)) {
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return;
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}
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connectionState = TcpConnectionStageConnecting;
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bool ipv6 = ConnectionsManager::getInstance().isIpv6Enabled();
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if (connectionType == ConnectionTypeDownload) {
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currentAddressFlags = 2;
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hostAddress = currentDatacenter->getCurrentAddress(currentAddressFlags | (ipv6 ? 1 : 0));
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if (hostAddress.empty()) {
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currentAddressFlags = 0;
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hostAddress = currentDatacenter->getCurrentAddress(currentAddressFlags | (ipv6 ? 1 : 0));
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}
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if (hostAddress.empty() && ipv6) {
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currentAddressFlags = 2;
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hostAddress = currentDatacenter->getCurrentAddress(currentAddressFlags);
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if (hostAddress.empty()) {
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currentAddressFlags = 0;
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hostAddress = currentDatacenter->getCurrentAddress(currentAddressFlags);
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}
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}
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} else {
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currentAddressFlags = 0;
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hostAddress = currentDatacenter->getCurrentAddress(currentAddressFlags | (ipv6 ? 1 : 0));
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if (ipv6 && hostAddress.empty()) {
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hostAddress = currentDatacenter->getCurrentAddress(currentAddressFlags);
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}
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}
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hostPort = (uint16_t) currentDatacenter->getCurrentPort(currentAddressFlags);
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reconnectTimer->stop();
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DEBUG_D("connection(%p, dc%u, type %d) connecting (%s:%hu)", this, currentDatacenter->getDatacenterId(), connectionType, hostAddress.c_str(), hostPort);
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firstPacketSent = false;
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if (restOfTheData != nullptr) {
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restOfTheData->reuse();
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restOfTheData = nullptr;
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}
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lastPacketLength = 0;
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wasConnected = false;
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hasSomeDataSinceLastConnect = false;
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openConnection(hostAddress, hostPort, ipv6);
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if (connectionType == ConnectionTypePush) {
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if (isTryingNextPort) {
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setTimeout(20);
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} else {
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setTimeout(30);
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}
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} else {
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if (isTryingNextPort) {
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setTimeout(8);
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} else {
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if (connectionType == ConnectionTypeUpload) {
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setTimeout(25);
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} else {
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setTimeout(15);
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}
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}
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}
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}
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void Connection::reconnect() {
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suspendConnection();
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connectionState = TcpConnectionStageReconnecting;
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connect();
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}
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void Connection::sendData(NativeByteBuffer *buff, bool reportAck) {
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if (buff == nullptr) {
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return;
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}
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buff->rewind();
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if (connectionState == TcpConnectionStageIdle || connectionState == TcpConnectionStageReconnecting || connectionState == TcpConnectionStageSuspended) {
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connect();
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}
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if (isDisconnected()) {
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buff->reuse();
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DEBUG_D("connection(%p, dc%u, type %d) disconnected, don't send data", this, currentDatacenter->getDatacenterId(), connectionType);
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return;
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}
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uint32_t bufferLen = 0;
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uint32_t packetLength = buff->limit() / 4;
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if (packetLength < 0x7f) {
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bufferLen++;
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} else {
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bufferLen += 4;
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}
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if (!firstPacketSent) {
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bufferLen += 64;
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}
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NativeByteBuffer *buffer = BuffersStorage::getInstance().getFreeBuffer(bufferLen);
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uint8_t *bytes = buffer->bytes();
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if (!firstPacketSent) {
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buffer->position(64);
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static uint8_t temp[64];
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while (true) {
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RAND_bytes(bytes, 64);
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uint32_t val = (bytes[3] << 24) | (bytes[2] << 16) | (bytes[1] << 8) | (bytes[0]);
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uint32_t val2 = (bytes[7] << 24) | (bytes[6] << 16) | (bytes[5] << 8) | (bytes[4]);
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if (bytes[0] != 0xef && val != 0x44414548 && val != 0x54534f50 && val != 0x20544547 && val != 0x4954504f && val != 0xeeeeeeee && val2 != 0x00000000) {
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bytes[56] = bytes[57] = bytes[58] = bytes[59] = 0xef;
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break;
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}
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}
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for (int a = 0; a < 48; a++) {
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temp[a] = bytes[55 - a];
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}
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encryptNum = decryptNum = 0;
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memset(encryptCount, 0, 16);
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memset(decryptCount, 0, 16);
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if (AES_set_encrypt_key(bytes + 8, 256, &encryptKey) < 0) {
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DEBUG_E("unable to set encryptKey");
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exit(1);
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}
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memcpy(encryptIv, bytes + 40, 16);
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if (AES_set_encrypt_key(temp, 256, &decryptKey) < 0) {
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DEBUG_E("unable to set decryptKey");
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exit(1);
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}
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memcpy(decryptIv, temp + 32, 16);
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AES_ctr128_encrypt(bytes, temp, 64, &encryptKey, encryptIv, encryptCount, &encryptNum);
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memcpy(bytes + 56, temp + 56, 8);
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firstPacketSent = true;
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}
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if (packetLength < 0x7f) {
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if (reportAck) {
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packetLength |= (1 << 7);
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}
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buffer->writeByte((uint8_t) packetLength);
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bytes += (buffer->limit() - 1);
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AES_ctr128_encrypt(bytes, bytes, 1, &encryptKey, encryptIv, encryptCount, &encryptNum);
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} else {
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packetLength = (packetLength << 8) + 0x7f;
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if (reportAck) {
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packetLength |= (1 << 7);
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}
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buffer->writeInt32(packetLength);
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bytes += (buffer->limit() - 4);
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AES_ctr128_encrypt(bytes, bytes, 4, &encryptKey, encryptIv, encryptCount, &encryptNum);
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}
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buffer->rewind();
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writeBuffer(buffer);
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buff->rewind();
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AES_ctr128_encrypt(buff->bytes(), buff->bytes(), buff->limit(), &encryptKey, encryptIv, encryptCount, &encryptNum);
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writeBuffer(buff);
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}
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void Connection::onDisconnected(int reason) {
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reconnectTimer->stop();
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DEBUG_D("connection(%p, dc%u, type %d) disconnected with reason %d", this, currentDatacenter->getDatacenterId(), connectionType, reason);
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bool switchToNextPort = wasConnected && !hasSomeDataSinceLastConnect && reason == 2;
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firstPacketSent = false;
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if (restOfTheData != nullptr) {
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restOfTheData->reuse();
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restOfTheData = nullptr;
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}
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connectionToken = 0;
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lastPacketLength = 0;
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wasConnected = false;
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if (connectionState != TcpConnectionStageSuspended && connectionState != TcpConnectionStageIdle) {
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connectionState = TcpConnectionStageIdle;
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}
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ConnectionsManager::getInstance().onConnectionClosed(this);
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uint32_t datacenterId = currentDatacenter->getDatacenterId();
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if (connectionState == TcpConnectionStageIdle && connectionType == ConnectionTypeGeneric && (datacenterId == ConnectionsManager::getInstance().currentDatacenterId || datacenterId == ConnectionsManager::getInstance().movingToDatacenterId)) {
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connectionState = TcpConnectionStageReconnecting;
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failedConnectionCount++;
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if (failedConnectionCount == 1) {
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if (hasSomeDataSinceLastConnect) {
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willRetryConnectCount = 5;
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} else {
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willRetryConnectCount = 1;
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}
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}
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if (ConnectionsManager::getInstance().isNetworkAvailable()) {
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isTryingNextPort = true;
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if (failedConnectionCount > willRetryConnectCount || switchToNextPort) {
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currentDatacenter->nextAddressOrPort(currentAddressFlags);
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failedConnectionCount = 0;
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}
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}
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DEBUG_D("connection(%p, dc%u, type %d) reconnect %s:%hu", this, currentDatacenter->getDatacenterId(), connectionType, hostAddress.c_str(), hostPort);
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reconnectTimer->setTimeout(1000, false);
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reconnectTimer->start();
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}
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}
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void Connection::onConnected() {
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connectionState = TcpConnectionStageConnected;
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connectionToken = lastConnectionToken++;
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wasConnected = true;
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DEBUG_D("connection(%p, dc%u, type %d) connected to %s:%hu", this, currentDatacenter->getDatacenterId(), connectionType, hostAddress.c_str(), hostPort);
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ConnectionsManager::getInstance().onConnectionConnected(this);
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}
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Datacenter *Connection::getDatacenter() {
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return currentDatacenter;
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}
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ConnectionType Connection::getConnectionType() {
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return connectionType;
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}
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uint32_t Connection::getConnectionToken() {
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return connectionToken;
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}
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