156 lines
3.9 KiB
C++
156 lines
3.9 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "mtproto/details/mtproto_serialized_request.h"
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#include "base/openssl_help.h"
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namespace MTP::details {
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namespace {
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uint32 CountPaddingPrimesCount(
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uint32 requestSize,
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bool forAuthKeyInner) {
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if (forAuthKeyInner) {
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return ((8 + requestSize) & 0x03)
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? (4 - ((8 + requestSize) & 0x03))
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: 0;
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}
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auto result = ((8 + requestSize) & 0x03)
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? (4 - ((8 + requestSize) & 0x03))
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: 0;
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// At least 12 bytes of random padding.
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if (result < 3) {
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result += 4;
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}
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// Some more random padding.
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return result + ((openssl::RandomValue<uchar>() & 0x0F) << 2);
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}
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} // namespace
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SerializedRequest::SerializedRequest(const RequestConstructHider::Tag &tag)
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: _data(std::make_shared<RequestData>(tag)) {
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}
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SerializedRequest SerializedRequest::Prepare(
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uint32 size,
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uint32 reserveSize) {
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Expects(size > 0);
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const auto finalSize = std::max(size, reserveSize);
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auto result = SerializedRequest(RequestConstructHider::Tag{});
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result->reserve(kMessageBodyPosition + finalSize);
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result->resize(kMessageBodyPosition);
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result->back() = (size << 2);
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result->lastSentTime = crl::now();
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return result;
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}
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RequestData *SerializedRequest::operator->() const {
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Expects(_data != nullptr);
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return _data.get();
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}
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RequestData &SerializedRequest::operator*() const {
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Expects(_data != nullptr);
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return *_data;
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}
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SerializedRequest::operator bool() const {
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return (_data != nullptr);
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}
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void SerializedRequest::setMsgId(mtpMsgId msgId) {
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Expects(_data != nullptr);
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Expects(_data->size() > kMessageBodyPosition);
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memcpy(_data->data() + kMessageIdPosition, &msgId, sizeof(mtpMsgId));
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}
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mtpMsgId SerializedRequest::getMsgId() const {
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Expects(_data != nullptr);
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Expects(_data->size() > kMessageBodyPosition);
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return *(mtpMsgId*)(_data->constData() + kMessageIdPosition);
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}
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void SerializedRequest::setSeqNo(uint32 seqNo) {
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Expects(_data != nullptr);
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Expects(_data->size() > kMessageBodyPosition);
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(*_data)[kSeqNoPosition] = mtpPrime(seqNo);
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}
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uint32 SerializedRequest::getSeqNo() const {
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Expects(_data != nullptr);
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Expects(_data->size() > kMessageBodyPosition);
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return uint32((*_data)[kSeqNoPosition]);
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}
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void SerializedRequest::addPadding(bool forAuthKeyInner) {
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Expects(_data != nullptr);
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Expects(_data->size() > kMessageBodyPosition);
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const auto requestSize = (tl::count_length(*this) >> 2);
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const auto padding = CountPaddingPrimesCount(
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requestSize,
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forAuthKeyInner);
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const auto fullSize = kMessageBodyPosition + requestSize + padding;
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if (uint32(_data->size()) != fullSize) {
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_data->resize(fullSize);
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if (padding > 0) {
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bytes::set_random(bytes::make_span(*_data).subspan(
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(fullSize - padding) * sizeof(mtpPrime)));
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}
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}
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}
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uint32 SerializedRequest::messageSize() const {
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Expects(_data != nullptr);
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Expects(_data->size() > kMessageBodyPosition);
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const auto ints = (tl::count_length(*this) >> 2);
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return kMessageIdInts + kSeqNoInts + kMessageLengthInts + ints;
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}
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bool SerializedRequest::needAck() const {
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Expects(_data != nullptr);
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Expects(_data->size() > kMessageBodyPosition);
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const auto type = mtpTypeId((*_data)[kMessageBodyPosition]);
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switch (type) {
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case mtpc_msg_container:
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case mtpc_msgs_ack:
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case mtpc_http_wait:
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case mtpc_bad_msg_notification:
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case mtpc_msgs_all_info:
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case mtpc_msgs_state_info:
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case mtpc_msg_detailed_info:
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case mtpc_msg_new_detailed_info:
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return false;
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}
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return true;
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}
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size_t SerializedRequest::sizeInBytes() const {
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Expects(!_data || _data->size() > kMessageBodyPosition);
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return _data ? (*_data)[kMessageLengthPosition] : 0;
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}
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const void *SerializedRequest::dataInBytes() const {
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Expects(!_data || _data->size() > kMessageBodyPosition);
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return _data ? (_data->constData() + kMessageBodyPosition) : nullptr;
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}
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} // namespace MTP
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