mirror of
https://gitea.wildfiregames.com/0ad/0ad
synced 2026-06-16 05:13:58 -07:00
98 lines
3 KiB
C++
98 lines
3 KiB
C++
/* Copyright (C) 2026 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "NetProtocol.h"
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#include "ps/CLogger.h"
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#include "ps/CStr.h"
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#include <algorithm>
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#include <chrono>
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#include <cstdint>
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#include <ngtcp2/ngtcp2.h>
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#include <gnutls/crypto.h>
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namespace
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{
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template <typename ModType>
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std::string GetModName(const ModType& mod)
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{
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return mod.m_Name + "-" + mod.m_Version;
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}
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}
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std::optional<HandshakeError> CheckHandshake(const CSrvHandshakeMessage& serverMessage, const CCliHandshakeMessage& clientMessage)
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{
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if (serverMessage.m_EngineVersion != clientMessage.m_EngineVersion)
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return HandshakeError{"engine", clientMessage.m_EngineVersion, serverMessage.m_EngineVersion};
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const auto& serverMods = serverMessage.m_EnabledMods;
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const auto& clientMods = clientMessage.m_EnabledMods;
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for (uint32_t i = 0; i < std::max(clientMods.size(), serverMods.size()); ++i)
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{
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if (i >= serverMods.size())
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return HandshakeError{"mod", GetModName(clientMods[i]), ""};
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if (i >= clientMods.size())
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return HandshakeError{"mod", "", GetModName(serverMods[i])};
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const std::string serverMod = GetModName(serverMods[i]);
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const std::string clientMod = GetModName(clientMods[i]);
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// Client and server have different mods enabled, or mods enabled in a different order
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if (clientMod != serverMod)
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return HandshakeError{"mod", clientMod, serverMod};
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}
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return {};
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}
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uint64_t timestamp()
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{
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return std::chrono::duration_cast<std::chrono::nanoseconds>(
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std::chrono::steady_clock::now().time_since_epoch()).count();
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}
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void increaseWindow(ngtcp2_conn* conn, const std::uint64_t streamId, const std::uint64_t size)
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{
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ngtcp2_conn_extend_max_offset(conn, size);
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ngtcp2_conn_extend_max_stream_offset(conn, streamId, size);
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}
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void OnRandomRequest(std::uint8_t* destination, const std::size_t destinationLength, const ngtcp2_rand_ctx*)
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{
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const int ret{gnutls_rnd(GNUTLS_RND_RANDOM, destination, destinationLength)};
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if (ret < 0)
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LOGERROR("gnutls_rnd: %s", gnutls_strerror(ret));
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}
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int OnNewConnectionIdRequest(ngtcp2_conn*, ngtcp2_cid* cid, std::uint8_t* token, const std::size_t cidlen,
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void* /*userData*/)
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{
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if (gnutls_rnd(GNUTLS_RND_RANDOM, cid->data, cidlen))
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return NGTCP2_ERR_CALLBACK_FAILURE;
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cid->datalen = cidlen;
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if (gnutls_rnd (GNUTLS_RND_RANDOM, token, NGTCP2_STATELESS_RESET_TOKENLEN))
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return NGTCP2_ERR_CALLBACK_FAILURE;
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return 0;
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}
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