126 lines
4.0 KiB
C++
126 lines
4.0 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/mtproto/PacketInfo.h"
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#include "td/mtproto/utils.h"
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#include "td/utils/common.h"
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#include "td/utils/logging.h"
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#include "td/utils/Slice.h"
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#include "td/utils/Status.h"
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#include "td/utils/UInt.h"
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#include <utility>
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namespace td {
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namespace mtproto {
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class AuthKey;
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class Transport {
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public:
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class ReadResult {
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public:
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enum Type { Packet, Nop, Error, Quickack };
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static ReadResult make_nop() {
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return {};
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}
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static ReadResult make_error(int32 error_code) {
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ReadResult res;
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res.type_ = Error;
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res.error_code_ = error_code;
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return res;
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}
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static ReadResult make_packet(MutableSlice packet) {
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CHECK(!packet.empty());
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ReadResult res;
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res.type_ = Packet;
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res.packet_ = packet;
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return res;
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}
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static ReadResult make_quick_ack(uint32 quick_ack) {
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ReadResult res;
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res.type_ = Quickack;
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res.quick_ack_ = quick_ack;
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return res;
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}
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Type type() const {
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return type_;
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}
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MutableSlice packet() const {
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CHECK(type_ == Packet);
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return packet_;
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}
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uint32 quick_ack() const {
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CHECK(type_ == Quickack);
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return quick_ack_;
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}
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int32 error() const {
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CHECK(type_ == Error);
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return error_code_;
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}
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private:
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Type type_ = Nop;
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MutableSlice packet_;
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int32 error_code_ = 0;
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uint32 quick_ack_ = 0;
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};
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static Result<uint64> read_auth_key_id(Slice message);
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// Reads mtproto packet from [message] and saves into [data].
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// If message is encrypted, [auth_key] is used.
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// Decryption and unpacking is made inplace, so [data] will be subslice of [message].
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// Returns size of mtproto packet.
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// If dest.size() >= size, the packet is also written into [dest].
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// If auth_key is nonempty, encryption will be used.
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static Result<ReadResult> read(MutableSlice message, const AuthKey &auth_key, PacketInfo *info) TD_WARN_UNUSED_RESULT;
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static size_t write(const Storer &storer, const AuthKey &auth_key, PacketInfo *info,
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MutableSlice dest = MutableSlice());
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private:
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template <class HeaderT>
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static std::pair<uint32, UInt128> calc_message_ack_and_key(const HeaderT &head, size_t data_size);
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static std::pair<uint32, UInt128> calc_message_key2(const AuthKey &auth_key, int X, Slice to_encrypt);
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template <class HeaderT>
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static size_t calc_crypto_size(size_t data_size);
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template <class HeaderT>
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static size_t calc_crypto_size2(size_t data_size);
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static size_t calc_no_crypto_size(size_t data_size);
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static Status read_no_crypto(MutableSlice message, PacketInfo *info, MutableSlice *data) TD_WARN_UNUSED_RESULT;
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static Status read_crypto(MutableSlice message, const AuthKey &auth_key, PacketInfo *info,
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MutableSlice *data) TD_WARN_UNUSED_RESULT;
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static Status read_e2e_crypto(MutableSlice message, const AuthKey &auth_key, PacketInfo *info,
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MutableSlice *data) TD_WARN_UNUSED_RESULT;
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template <class HeaderT, class PrefixT>
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static Status read_crypto_impl(int X, MutableSlice message, const AuthKey &auth_key, HeaderT **header_ptr,
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PrefixT **prefix_ptr, MutableSlice *data, PacketInfo *info) TD_WARN_UNUSED_RESULT;
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static size_t write_no_crypto(const Storer &storer, PacketInfo *info, MutableSlice dest);
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static size_t write_crypto(const Storer &storer, const AuthKey &auth_key, PacketInfo *info, MutableSlice dest);
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static size_t write_e2e_crypto(const Storer &storer, const AuthKey &auth_key, PacketInfo *info, MutableSlice dest);
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template <class HeaderT>
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static void write_crypto_impl(int X, const Storer &storer, const AuthKey &auth_key, PacketInfo *info, HeaderT *header,
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size_t data_size);
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};
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} // namespace mtproto
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} // namespace td
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