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tgtransport.cpp
1260 lines (988 loc) · 35 KB
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tgtransport.cpp
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#include "tgtransport.h"
#include "tgclient.h"
#include <QDateTime>
#include "mtschema.h"
#include "crypto.h"
#include <QtEndian>
#include <QList>
#include <cstdlib>
#include "tlschema.h"
#include "apisecrets.h"
#include "systemname.h"
#include <QCoreApplication>
#include <QLocale>
#include <QStringList>
#include <qcompressor.h>
#include <QSettings>
TgTransport::TgTransport(TgClient *parent, QString sessionName, qint32 dcId)
: QObject(parent)
, _client(parent)
, _socket(0)
, _timer()
, testMode(false) //Change it for debugging or whatever
, mediaOnly(false) //Change it for debugging or whatever
, currentDc(dcId)
, currentPort(0)
, currentHost()
, isMain(dcId == 0)
, tgConfig()
, nonce()
, serverNonce()
, newNonce()
, authKey()
, serverSalt(0)
, authKeyId(0)
, timeOffset(0)
, sequence(0)
, lastMessageId(0)
, sessionId(0)
, pingId(0)
, userId(0)
, pendingMessages()
, migrationMessages()
, floodMessages()
, _sessionName(sessionName)
, msgsToAck()
, authCheckMsgId(0)
, initialized(false)
{
if (_sessionName.isEmpty()) {
_sessionName = "user_session";
}
_socket = new QTcpSocket(this);
_socket->setSocketOption(QTcpSocket::LowDelayOption, 1);
_socket->setSocketOption(QTcpSocket::KeepAliveOption, 1);
connect(_socket, SIGNAL(connected()), this, SLOT(_connected()));
connect(_socket, SIGNAL(disconnected()), this, SLOT(_disconnected()));
connect(_socket, SIGNAL(readyRead()), this, SLOT(_readyRead()));
connect(_socket, SIGNAL(bytesWritten(qint64)), this, SLOT(_bytesSent(qint64)));
connect(_socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(_error(QAbstractSocket::SocketError)));
loadSession();
}
TgTransport::~TgTransport()
{
stop();
}
void TgTransport::resetSession()
{
kgDebug() << "Resetting session";
stop();
authKey = QByteArray();
sessionId = 0;
userId = 0;
saveSession(true);
pendingMessages.clear();
migrationMessages.clear();
msgsToAck.clear();
initialized = false;
_client->handleDisconnected();
}
bool TgTransport::hasSession()
{
return userId && sessionId && serverSalt && authKeyId && !authKey.isEmpty();
}
bool TgTransport::hasUserId()
{
return userId != 0;
}
TgLong TgTransport::getUserId()
{
return userId;
}
qint32 TgTransport::dcId()
{
return currentDc;
}
void TgTransport::saveSession(bool reset)
{
if (currentDc == 0) {
return;
}
kgDebug() << "Saving session" << _sessionName;
//TODO: password encryption
QSettings settings(QSettings::IniFormat, QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName() + "_" + _sessionName);
if (reset) {
settings.clear();
}
if (isMain) {
settings.beginGroup("Transport");
settings.setValue("MainDc", currentDc);
settings.endGroup();
}
settings.beginGroup("DcSession" + QString::number((currentDc + (testMode ? 10000 : 0)) * (mediaOnly ? -1 : 1)));
settings.setValue("CurrentHost", currentHost);
settings.setValue("CurrentPort", currentPort);
settings.setValue("AuthKey", authKey);
settings.setValue("ServerSalt", serverSalt);
settings.setValue("AuthKeyId", authKeyId);
settings.setValue("TimeOffset", timeOffset);
settings.setValue("Sequence", sequence);
settings.setValue("LastMessageId", lastMessageId);
settings.setValue("SessionId", sessionId);
settings.setValue("PingId", pingId);
settings.setValue("UserId", userId);
settings.endGroup();
}
void TgTransport::loadSession()
{
kgDebug() << "Loading session" << _sessionName;
QSettings settings(QSettings::IniFormat, QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName() + "_" + _sessionName);
if (isMain) {
settings.beginGroup("Transport");
currentDc = settings.value("MainDc").toInt();
settings.endGroup();
}
settings.beginGroup("DcSession" + QString::number((currentDc + (testMode ? 10000 : 0)) * (mediaOnly ? -1 : 1)));
currentHost = settings.value("CurrentHost").toString();
currentPort = settings.value("CurrentPort").toInt();
authKey = settings.value("AuthKey").toByteArray();
serverSalt = settings.value("ServerSalt").toLongLong();
authKeyId = settings.value("AuthKeyId").toLongLong();
timeOffset = settings.value("TimeOffset").toInt();
sequence = settings.value("Sequence").toInt();
lastMessageId = settings.value("LastMessageId").toLongLong();
sessionId = settings.value("SessionId").toLongLong();
pingId = settings.value("PingId").toLongLong();
userId = settings.value("UserId").toLongLong();
settings.endGroup();
}
void TgTransport::setDc(QString host, quint16 port, qint32 dcId)
{
stop();
currentDc = dcId;
loadSession();
currentDc = dcId;
currentHost = host;
currentPort = port;
tgConfig = TgObject();
saveSession();
}
void TgTransport::resetDc()
{
setDc(testMode ? "149.154.167.40" : "149.154.167.50", 443, 2);
}
TgObject TgTransport::config()
{
return tgConfig;
}
void TgTransport::setConfig(TgObject config)
{
if (!tgConfig.isEmpty()) {
return;
}
tgConfig = config;
}
void TgTransport::migrateTo(qint32 dcId)
{
if (dcId == currentDc) {
kgDebug() << "Already on" << currentDc << ", migration not needed";
return;
}
kgDebug() << "Migrating to DC" << dcId;
stop();
TgList dcOptions = tgConfig["dc_options"].toList();
QString targetHost;
quint16 targetPort = 0;
for (qint32 i = 0; i < dcOptions.size(); ++i) {
TgObject option = dcOptions[i].toMap();
if (option["id"].toInt() != dcId
|| option["ipv6"].toBool()
|| option["media_only"].toBool() != mediaOnly
|| option["tcpo_only"].toBool()
|| option["cdn"].toBool())
continue;
targetHost = option["ip_address"].toString();
targetPort = option["port"].toInt();
break;
}
if (targetHost.isEmpty()) {
kgDebug() << "DC" << dcId << "not found. Resetting to default DC.";
resetDc();
start();
return;
}
currentDc = dcId;
currentHost = targetHost;
if (targetPort) {
currentPort = targetPort;
}
saveSession();
start();
}
void TgTransport::start()
{
if (_socket->state() != 0)
return;
loadSession();
if (currentHost.isEmpty() || !currentPort || !currentDc) {
resetDc();
saveSession();
}
kgDebug() << "Starting transport, DC" << currentDc;
_socket->connectToHost(currentHost, currentPort);
_timer.start(60000, this);
}
void TgTransport::stop(bool sendMsgsAckBool)
{
saveSession();
if (_socket->state() == 0)
return;
kgDebug() << "Stopping transport";
if (sendMsgsAckBool)
sendMsgsAck();
_timer.stop();
_socket->flush();
_socket->disconnectFromHost();
if (_socket->state() == QTcpSocket::ClosingState)
_socket->waitForBytesWritten();
}
void TgTransport::_error(QAbstractSocket::SocketError socketError)
{
kgDebug() << "Socket errored:" << socketError << "/" << _socket->errorString();
_disconnected();
_client->handleSocketError(socketError, _socket->errorString());
}
void TgTransport::_connected()
{
kgDebug() << "Socket connected";
TgPacket packet;
writeInt32(packet, 0xeeeeeeee);
_socket->write(packet.toByteArray());
_client->handleConnected();
if (hasSession()) {
initConnection();
} else {
authorize();
}
}
void TgTransport::_disconnected()
{
kgDebug() << "Socket disconnected";
initialized = false;
_client->handleDisconnected();
}
void TgTransport::timerEvent(QTimerEvent *event)
{
kgDebug() << "Sending ping";
if (pendingMessages.size() >= 40) {
kgDebug() << "TOO MANY pending messages," << pendingMessages.size() << "items, clearing";
pendingMessages.clear();
}
QList<qint64> keys = floodMessages.keys();
kgDebug() << "Flood Pending:" << keys;
for (qint32 i = 0; i < keys.size(); ++i) {
sendMTMessage(floodMessages.take(keys[i]), keys[i], false);
}
sendMsgsAck();
saveSession();
TGOBJECT(MTType::PingDelayDisconnectMethod, ping);
ping["ping_id"] = pingId++;
ping["disconnect_delay"] = 75;
sendMTObject<&writeMTMethodPingDelayDisconnect>(ping);
}
qint64 TgTransport::sendPlainMessage(QByteArray data, qint64 oldMid)
{
//TODO: lock
if (data.isEmpty())
return 0;
TgPacket packet;
writeInt64(packet, 0);
qint64 messageId = getNewMessageId();
writeInt64(packet, messageId);
writeInt32(packet, data.length());
if (oldMid)
broadcastMessageChange(oldMid, messageId);
sendIntermediate(packet.toByteArray() + data);
return messageId;
}
void TgTransport::sendIntermediate(QByteArray data)
{
TgPacket packet;
writeInt32(packet, data.length());
_socket->write(packet.toByteArray() + data);
}
void TgTransport::authorize()
{
kgDebug() << "DH exchange: step 1";
newNonce.clear();
serverNonce.clear();
TGOBJECT(MTType::ReqPqMultiMethod, reqPq);
reqPq["nonce"] = nonce = randomBytes(INT128_BYTES);
sendPlainObject<&writeMTMethodReqPqMulti>(reqPq);
}
void TgTransport::_readyRead()
{
//kgDebug() << "Ready to read";
while (_socket->bytesAvailable()) {
processMessage(readIntermediate());
}
}
QByteArray TgTransport::readIntermediate()
{
QByteArray buffer = readFully(*_socket, 4);
if (buffer.isEmpty()) {
return QByteArray();
}
TgPacket packet(buffer);
QVariant var;
readInt32(packet, var);
return readFully(*_socket, var.toInt());
}
void TgTransport::processMessage(QByteArray message)
{
//TODO: lock
TgPacket packet(message);
if (message.length() <= 4) {
QVariant error;
readInt32(packet, error);
kgCritical() << "Got MTProto error:" << error.toInt();
return;
}
QVariant var;
readInt64(packet, var); //auth_key_id
qint64 messageId;
QByteArray data;
if (var.toLongLong() == 0) {
readInt64(packet, var); //message_id
messageId = var.toLongLong();
readInt32(packet, var); //message_length
readRawBytes(packet, data, var.toInt());
} else {
//TODO: Important checks
//TODO: check auth key id
//TODO: check msg_key correctness
//TODO: NB: after decryption, msg_key must be equal to SHA-256 of data thus obtained.
QByteArray messageKey;
readRawBytes(packet, messageKey, 16);
QByteArray keyIv;
QByteArray keyData = calcEncryptionKey(authKey, messageKey, keyIv, false);
TgPacket plainMessage(decryptAES256IGE(message.mid(24), keyIv, keyData));
readUInt64(plainMessage, var); //remoteSalt
readUInt64(plainMessage, var); //remoteId
readInt64(plainMessage, var); //remoteMessageId
messageId = var.toLongLong();
readInt32(plainMessage, var); //remoteSequence
readInt32(plainMessage, var); //messageLength
readRawBytes(plainMessage, data, var.toInt());
}
handleObject(data, messageId);
}
void TgTransport::handleObject(QByteArray data, qint64 messageId)
{
TgPacket packet(data);
QVariant var;
readInt32(packet, var);
qint32 conId = var.toInt();
//kgDebug() << "Got an object" << conId << ", msg id" << messageId;
if (!msgsToAck.contains(messageId))
msgsToAck.append(messageId);
if (conId != MTType::RpcError && conId != MTType::BadMsgNotification && conId != MTType::BadServerSalt)
pendingMessages.remove(messageId);
switch (conId) {
case TLType::BoolTrue:
case TLType::BoolFalse:
handleBool(data, messageId);
break;
case MTType::ResPQ:
handleResPQ(data, messageId);
break;
case MTType::ServerDHParamsOk:
handleServerDHParamsOk(data, messageId);
break;
case MTType::DhGenOk:
handleDhGenOk(data, messageId);
break;
case MTType::MsgContainer:
handleMsgContainer(data, messageId);
break;
case MTType::MsgCopy:
handleMsgCopy(data, messageId);
break;
case MTType::RpcResult:
handleRpcResult(data, messageId);
break;
case MTType::GzipPacked:
handleGzipPacked(data, messageId);
break;
case MTType::RpcError:
handleRpcError(data, messageId);
break;
case MTType::BadMsgNotification:
handleBadMsgNotification(data, messageId);
break;
case MTType::BadServerSalt:
handleBadServerSalt(data, messageId);
break;
case MTType::PingMethod:
handlePingMethod(data, messageId);
break;
case TLType::Config:
handleConfig(data, messageId);
break;
case TLType::AuthAuthorization:
handleAuthorization(data, messageId);
break;
case MTType::Vector:
handleVector(data, messageId);
break;
case MTType::MsgDetailedInfo:
handleMsgDetailedInfo(data, messageId);
break;
case MTType::MsgNewDetailedInfo:
handleMsgNewDetailedInfo(data, messageId);
break;
case MTType::NewSessionCreated:
case MTType::MsgsAck:
case MTType::Pong:
case MTType::RpcAnswerUnknown:
case MTType::RpcAnswerDroppedRunning:
case MTType::RpcAnswerDropped:
case MTType::FutureSalt:
case MTType::FutureSalts:
kgDebug() << "INFO: Ignoring" << conId;
break;
default:
_client->handleObject(data, messageId);
break;
}
}
//TODO: handle NewSessionCreated?
void TgTransport::handleResPQ(QByteArray data, qint64 messageId)
{
TgPacket packet(data);
QVariant var;
readMTResPQ(packet, var);
TgObject obj = var.toMap();
kgDebug() << "DH exchange: step 2";
if (obj["nonce"].toByteArray() != nonce) {
kgCritical() << "SECURITY ERROR: nonces are different";
return;
}
serverNonce = obj["server_nonce"].toByteArray();
kgDebug() << "DH exchange: step 3";
QByteArray pqBytes = obj["pq"].toByteArray();
quint64 pq = qFromBigEndian<quint64>((const uchar*) pqBytes.constData());
quint32 p = findDivider(pq);
quint32 q = pq / p;
if (p > q) qSwap(p, q);
QByteArray pBytes(INT32_BYTES, 0);
qToBigEndian(p, (uchar*) pBytes.data());
QByteArray qBytes(INT32_BYTES, 0);
qToBigEndian(q, (uchar*) qBytes.data());
QList<DHKey> keychain = QList<DHKey>()
<< DHKey("00e8bb3305c0b52c6cf2afdf763731"
"3489e63e05268e5badb601af417786"
"472e5f93b85438968e20e6729a301c"
"0afc121bf7151f834436f7fda68084"
"7a66bf64accec78ee21c0b316f0eda"
"fe2f41908da7bd1f4a5107638eeb67"
"040ace472a14f90d9f7c2b7def9968"
"8ba3073adb5750bb02964902a359fe"
"745d8170e36876d4fd8a5d41b2a76c"
"bff9a13267eb9580b2d06d10357448"
"d20d9da2191cb5d8c93982961cdfde"
"da629e37f1fb09a0722027696032fe"
"61ed663db7a37f6f263d370f69db53"
"a0dc0a1748bdaaff6209d5645485e6"
"e001d1953255757e4b8e42813347b1"
"1da6ab500fd0ace7e6dfa3736199cc"
"af9397ed0745a427dcfa6cd67bcb1a"
"cff3", -3414540481677951611LL)
<< DHKey("00c8c11d635691fac091dd9489aedc"
"ed2932aa8a0bcefef05fa800892d9b"
"52ed03200865c9e97211cb2ee6c7ae"
"96d3fb0e15aeffd66019b44a08a240"
"cfdd2868a85e1f54d6fa5deaa041f6"
"941ddf302690d61dc476385c2fa655"
"142353cb4e4b59f6e5b6584db76fe8"
"b1370263246c010c93d011014113eb"
"df987d093f9d37c2be48352d69a168"
"3f8f6e6c2167983c761e3ab169fde5"
"daaa12123fa1beab621e4da5935e9c"
"198f82f35eae583a99386d8110ea6b"
"d1abb0f568759f62694419ea5f6984"
"7c43462abef858b4cb5edc84e7b922"
"6cd7bd7e183aa974a712c079dde85b"
"9dc063b8a5c08e8f859c0ee5dcd824"
"c7807f20153361a7f63cfd2a433a1b"
"e7f5", -5595554452916591101LL);
TgVector serverKeyFingerprints = obj["server_public_key_fingerprints"].toList();
QList<DHKey> matched;
for (qint32 i = 0; i < serverKeyFingerprints.length(); ++i) {
for (qint32 j = 0; j < keychain.length(); ++j) {
if (serverKeyFingerprints[i].toLongLong() == keychain[j].fingerprint) {
matched << keychain[j];
kgDebug() << "Matched fingerprint: " << keychain[j].fingerprint;
break;
}
}
if (!matched.isEmpty()) {
break;
}
}
if (matched.isEmpty()) {
kgCritical() << "SECURITY ERROR: no suitable keys are found";
return;
}
TGOBJECT(MTType::PQInnerDataDc, pqInnerData);
pqInnerData["pq"] = pqBytes;
pqInnerData["p"] = pBytes;
pqInnerData["q"] = qBytes;
pqInnerData["nonce"] = nonce;
pqInnerData["server_nonce"] = serverNonce;
pqInnerData["new_nonce"] = newNonce = randomBytes(INT256_BYTES);
//it works without DC ID lol
pqInnerData["dc"] = (currentDc + (testMode ? 10000 : 0)) * (mediaOnly ? -1 : 1);
TgPacket pidPacket;
writeMTPQInnerData(pidPacket, pqInnerData);
QByteArray pidData = pidPacket.toByteArray();
if (pidData.length() > 144) {
kgCritical() << "SECURITY ERROR: pqInnerData is longer that 144 bytes";
return;
}
QByteArray encryptedData = rsaPad(pidData, matched[0]);
encryptedData.insert(0, QByteArray(256 - encryptedData.size(), 0));
TGOBJECT(MTType::ReqDHParamsMethod, reqDH);
reqDH["nonce"] = nonce;
reqDH["server_nonce"] = serverNonce;
reqDH["p"] = pBytes;
reqDH["q"] = qBytes;
reqDH["public_key_fingerprint"] = matched[0].fingerprint;
reqDH["encrypted_data"] = encryptedData;
sendPlainObject<&writeMTMethodReqDHParams>(reqDH);
kgDebug() << "DH exchange: step 4";
}
void TgTransport::handleServerDHParamsOk(QByteArray data, qint64 messageId)
{
qint32 localTime = QDateTime::currentDateTimeUtc().toTime_t();
TgPacket packet(data);
QVariant var;
readMTServerDHParams(packet, var);
TgObject obj = var.toMap();
kgDebug() << "DH exchange: step 5";
if (obj["nonce"].toByteArray() != nonce) {
kgCritical() << "SECURITY ERROR: nonces are different";
return;
}
if (obj["server_nonce"].toByteArray() != serverNonce) {
kgCritical() << "SECURITY ERROR: server nonces are different";
return;
}
QByteArray encryptedAnswer = obj["encrypted_answer"].toByteArray();
QByteArray tempAesKey = hashSHA1(newNonce + serverNonce) + hashSHA1(serverNonce + newNonce).mid(0, 12);
QByteArray tempAesIv = hashSHA1(serverNonce + newNonce).mid(12, 8) + hashSHA1(newNonce + newNonce) + newNonce.mid(0, 4);
TgPacket answerPacket(decryptAES256IGE(encryptedAnswer, tempAesIv, tempAesKey));
QByteArray answerHash;
readRawBytes(answerPacket, answerHash, 20);
//TODO: verify SHA1
readMTServerDHInnerData(answerPacket, var);
TgObject innerData = var.toMap();
QByteArray bBytes = randomBytes(256);
qint32 gValue = innerData["g"].toInt();
QByteArray gBytes(4, 0);
qToBigEndian(gValue, (uchar*) gBytes.data());
QByteArray dhPrime = innerData["dh_prime"].toByteArray();
//TODO: check dh prime (cpu expensive!)
QByteArray gbBytes = encryptRSA(gBytes, dhPrime, bBytes);
TGOBJECT(MTType::ClientDHInnerData, clientInnerData);
clientInnerData["nonce"] = nonce;
clientInnerData["server_nonce"] = serverNonce;
clientInnerData["retry_id"] = 0;
//TODO: retry ID support
clientInnerData["g_b"] = gbBytes;
TgPacket clientInnerDataPacket;
writeMTClientDHInnerData(clientInnerDataPacket, clientInnerData);
QByteArray cidBytes = clientInnerDataPacket.toByteArray();
QByteArray dataWithHash = hashSHA1(cidBytes) + cidBytes;
dataWithHash += randomBytes(16 - dataWithHash.size() % 16);
QByteArray encryptedData = encryptAES256IGE(dataWithHash, tempAesIv, tempAesKey);
TGOBJECT(MTType::SetClientDHParamsMethod, setParams);
setParams["nonce"] = nonce;
setParams["server_nonce"] = serverNonce;
setParams["encrypted_data"] = encryptedData;
sessionId = randomLong();
QByteArray gaBytes = innerData["g_a"].toByteArray();
authKey = encryptRSA(gaBytes, dhPrime, bBytes);
authKey.insert(0, QByteArray(256 - authKey.size(), 0));
serverSalt = qFromLittleEndian<qint64>((const uchar*) xorArray(newNonce.mid(0, 8), serverNonce.mid(0, 8)).constData());
authKeyId = qFromLittleEndian<qint64>((const uchar*) hashSHA1(authKey).mid(12, 8).constData());
timeOffset = innerData["server_time"].toInt() - localTime;
sequence = 0;
lastMessageId = 0;
sendPlainObject<&writeMTMethodSetClientDHParams>(setParams);
}
void TgTransport::handleDhGenOk(QByteArray data, qint64 messageId)
{
TgPacket packet(data);
QVariant var;
readMTSetClientDHParamsAnswer(packet, var);
TgObject obj = var.toMap();
if (obj["nonce"].toByteArray() != nonce) {
kgCritical() << "SECURITY ERROR: nonces are different";
return;
}
if (obj["server_nonce"].toByteArray() != serverNonce) {
kgCritical() << "SECURITY ERROR: server nonces are different";
return;
}
QByteArray newNonceHash1 = hashSHA1(newNonce + QByteArray(1, 1) + hashSHA1(authKey).mid(0, 8)).mid(4);
if (obj["new_nonce_hash1"].toByteArray() != newNonceHash1) {
kgCritical() << "SECURITY ERROR: new nonce hashes are different";
return;
}
//TODO: important checks
kgDebug() << "DH completed";
saveSession();
initConnection();
}
void TgTransport::initConnection()
{
kgDebug() << "Initializing connection";
TGOBJECT(TLType::HelpGetConfigMethod, getConfig);
TGOBJECT(TLType::InitConnectionMethod, initConnection);
initConnection["api_id"] = KUTEGRAM_API_ID;
initConnection["device_model"] = QString(systemName() + "-based device");
initConnection["system_version"] = systemName();
QString appVersion = QCoreApplication::applicationVersion();
if (appVersion.isEmpty())
appVersion = "1.0.0";
initConnection["app_version"] = appVersion;
initConnection["system_lang_code"] = QLocale::system().name().split("_")[0];
initConnection["lang_pack"] = "";
initConnection["lang_code"] = QLocale::system().name().split("_")[0];
initConnection["query"] = getConfig;
TGOBJECT(TLType::InvokeWithLayerMethod, invokeWithLayer);
invokeWithLayer["layer"] = API_LAYER;
invokeWithLayer["query"] = initConnection;
sendMTObject< &writeTLMethodInvokeWithLayer
< &readTLMethodInitConnection
< &readTLMethodHelpGetConfig ,
&writeTLMethodHelpGetConfig > ,
&writeTLMethodInitConnection
< &readTLMethodHelpGetConfig ,
&writeTLMethodHelpGetConfig > > >(invokeWithLayer);
}
QByteArray TgTransport::gzipPacket(QByteArray data)
{
QByteArray packedData;
if (!QCompressor::gzipCompress(data, packedData)) {
kgCritical() << "ERROR: Gzip compression error.";
return data;
}
TGOBJECT(MTType::GzipPacked, zipped);
zipped["packed_data"] = packedData;
TgPacket packet;
writeMTObject(packet, zipped);
return packet.toByteArray();
}
TgLong TgTransport::sendMsgsAck()
{
if (msgsToAck.isEmpty())
return 0;
if (!initialized)
return 0;
kgDebug() << "Sending MsgsAck," << msgsToAck.size() << "items";
//if (msgsToAck.size() <= 20) kgDebug() << msgsToAck;
//TODO: max 8192 ids
TGOBJECT(MTType::MsgsAck, msgsAck);
msgsAck["msg_ids"] = TgList(msgsToAck);
msgsToAck.clear();
return sendMTMessage(tlSerialize<&writeMTMsgsAck>(msgsAck), 0, true);
}
qint64 TgTransport::sendMTMessage(QByteArray originalData, qint64 oldMid, bool isMsgsAck)
{
//TODO: lock
if (authKey.isEmpty())
return sendPlainMessage(originalData, oldMid);
if (originalData.isEmpty())
return 0;
if (!isMsgsAck)
sendMsgsAck();
QByteArray data = originalData;
if (data.size() > 255)
data = gzipPacket(data);
TgPacket packet;
writeInt64(packet, serverSalt);
writeInt64(packet, sessionId);
qint64 messageId = getNewMessageId();
writeInt64(packet, messageId);
writeInt32(packet, generateSequence(!isMsgsAck));
writeInt32(packet, data.length());
writeRawBytes(packet, data);
writeRawBytes(packet, randomBytes((0x7FFFFFF0 - data.length()) % 16 + (randomInt(14) + 2) * 16));
QByteArray packetBytes = packet.toByteArray();
QByteArray messageKey = calcMessageKey(authKey, packetBytes);
QByteArray keyIv;
QByteArray keyData = calcEncryptionKey(authKey, messageKey, keyIv, true);
QByteArray cipherText = encryptAES256IGE(packetBytes, keyIv, keyData);
TgPacket cipherPacket;
writeInt64(cipherPacket, authKeyId);
writeRawBytes(cipherPacket, messageKey);
writeRawBytes(cipherPacket, cipherText);
if (!isMsgsAck)
pendingMessages.insert(messageId, originalData);
if (oldMid)
broadcastMessageChange(oldMid, messageId);
sendIntermediate(cipherPacket.toByteArray());
return messageId;
}
qint64 TgTransport::getNewMessageId()
{
//TODO: lock
qint64 time = QDateTime::currentDateTime().toUTC().toTime_t();
qint64 newMessageId = ((time + timeOffset) << 32) | (((time + timeOffset) % 1000) << 22);
if (lastMessageId >= newMessageId) newMessageId = lastMessageId + 4;
lastMessageId = newMessageId;
return newMessageId;
}
qint32 TgTransport::generateSequence(bool isContent)
{
//TODO: lock
qint32 result = isContent ? sequence++ * 2 + 1 : sequence++ * 2;
return result;
}
void TgTransport::_bytesSent(qint64 count)
{
//kgDebug() << "Sent" << count << "bytes";
}
void TgTransport::handleMsgContainer(QByteArray data, qint64 messageId)
{
TgPacket packet(data);
QVariant var;
readInt32(packet, var); //conId
readInt32(packet, var); //size
qint32 size = var.toInt();
for (qint32 i = 0; i < size; ++i) {
readInt64(packet, var); //msgId
qint64 newMessageId = var.toLongLong();
readInt32(packet, var); //seqNo
readInt32(packet, var); //size
QByteArray array;
readRawBytes(packet, array, var.toInt());
handleObject(array, newMessageId);
}
}
void TgTransport::handleRpcResult(QByteArray data, qint64 messageId)
{
TgPacket packet(data);
QVariant var;
readInt32(packet, var); //conId
readInt64(packet, var); //req_msg_id
handleObject(data.mid(12), var.toLongLong());
}
void TgTransport::handleGzipPacked(QByteArray data, qint64 messageId)
{
TgPacket packet(data);
QVariant var;
readInt32(packet, var); //conId
readByteArray(packet, var); //gzippedData
if (!QCompressor::gzipDecompress(var.toByteArray(), data)) {
kgCritical() << "ERROR: Gzip decompression error.";
return;
}
handleObject(data, messageId);
}
void TgTransport::handleRpcError(QByteArray data, qint64 messageId)
{
TgPacket packet(data);
QVariant errorCodeVariant;
readInt32(packet, errorCodeVariant); //conId
readInt32(packet, errorCodeVariant);
qint32 errorCode = errorCodeVariant.toInt();
QVariant errorMessageVariant;
readString(packet, errorMessageVariant);