#include "pch.h" #include "limits.h" #include "hoststate.h" #include "r2client.h" #include "r2engine.h" #include "tier0.h" #include "serverauthentication.h" AUTOHOOK_INIT() ServerLimitsManager* g_pServerLimits; ConVar* Cvar_net_datablock_enabled; void ServerLimitsManager::AddPlayer(R2::CBaseClient* player) { PlayerLimitData limitData; m_PlayerLimitData.insert(std::make_pair(player, limitData)); } bool ServerLimitsManager::CheckStringCommandLimits(R2::CBaseClient* player) { if (CVar_sv_quota_stringcmdspersecond->GetInt() != -1) { // note: this isn't super perfect, legit clients can trigger it in lobby if they try, mostly good enough tho imo if (Tier0::Plat_FloatTime() - m_PlayerLimitData[player].lastClientCommandQuotaStart >= 1.0) { // reset quota m_PlayerLimitData[player].lastClientCommandQuotaStart = Tier0::Plat_FloatTime(); m_PlayerLimitData[player].numClientCommandsInQuota = 0; } m_PlayerLimitData[player].numClientCommandsInQuota++; if (m_PlayerLimitData[player].numClientCommandsInQuota > CVar_sv_quota_stringcmdspersecond->GetInt()) { // too many stringcmds, dc player return false; } } return true; } bool ServerLimitsManager::CheckChatLimits(R2::CBaseClient* player) { if (Tier0::Plat_FloatTime() - m_PlayerLimitData[player].lastSayTextLimitStart >= 1.0) { m_PlayerLimitData[player].lastSayTextLimitStart = Tier0::Plat_FloatTime(); m_PlayerLimitData[player].sayTextLimitCount = 0; } if (m_PlayerLimitData[player].sayTextLimitCount >= Cvar_sv_max_chat_messages_per_sec->GetInt()) return false; m_PlayerLimitData[player].sayTextLimitCount++; return true; } AUTOHOOK(CNetChan__ProcessMessages, engine.dll + 0x2140A0, char, __fastcall, (void* self, void* buf)) { enum eNetChanLimitMode { NETCHANLIMIT_WARN, NETCHANLIMIT_KICK }; double startTime = Tier0::Plat_FloatTime(); char ret = CNetChan__ProcessMessages(self, buf); // check processing limits, unless we're in a level transition if (R2::g_pHostState->m_iCurrentState == R2::HostState_t::HS_RUN && Tier0::ThreadInServerFrameThread()) { // player that sent the message R2::CBaseClient* sender = *(R2::CBaseClient**)((char*)self + 368); // if no sender, return // relatively certain this is fine? if (!sender || !g_pServerLimits->m_PlayerLimitData.count(sender)) return ret; // reset every second if (startTime - g_pServerLimits->m_PlayerLimitData[sender].lastNetChanProcessingLimitStart >= 1.0 || g_pServerLimits->m_PlayerLimitData[sender].lastNetChanProcessingLimitStart == -1.0) { g_pServerLimits->m_PlayerLimitData[sender].lastNetChanProcessingLimitStart = startTime; g_pServerLimits->m_PlayerLimitData[sender].netChanProcessingLimitTime = 0.0; } g_pServerLimits->m_PlayerLimitData[sender].netChanProcessingLimitTime += (Tier0::Plat_FloatTime() * 1000) - (startTime * 1000); if (g_pServerLimits->m_PlayerLimitData[sender].netChanProcessingLimitTime >= g_pServerLimits->Cvar_net_chan_limit_msec_per_sec->GetInt()) { spdlog::warn( "Client {} hit netchan processing limit with {}ms of processing time this second (max is {})", (char*)sender + 0x16, g_pServerLimits->m_PlayerLimitData[sender].netChanProcessingLimitTime, g_pServerLimits->Cvar_net_chan_limit_msec_per_sec->GetInt()); // never kick local player if (g_pServerLimits->Cvar_net_chan_limit_mode->GetInt() != NETCHANLIMIT_WARN && strcmp(R2::g_pLocalPlayerUserID, sender->m_UID)) { R2::CBaseClient__Disconnect(sender, 1, "Exceeded net channel processing limit"); return false; } } } return ret; } AUTOHOOK(ProcessConnectionlessPacket, engine.dll + 0x117800, bool, , (void* a1, R2::netpacket_t* packet)) { if (packet->adr.type == R2::NA_IP && (!(packet->data[4] == 'N' && Cvar_net_datablock_enabled->GetBool()) || !Cvar_net_datablock_enabled->GetBool())) { // bad lookup: optimise later tm UnconnectedPlayerLimitData* sendData = nullptr; for (UnconnectedPlayerLimitData& foundSendData : g_pServerLimits->m_UnconnectedPlayerLimitData) { if (!memcmp(packet->adr.ip, foundSendData.ip, 16)) { sendData = &foundSendData; break; } } if (!sendData) { sendData = &g_pServerLimits->m_UnconnectedPlayerLimitData.emplace_back(); memcpy(sendData->ip, packet->adr.ip, 16); } if (Tier0::Plat_FloatTime() < sendData->timeoutEnd) return false; if (Tier0::Plat_FloatTime() - sendData->lastQuotaStart >= 1.0) { sendData->lastQuotaStart = Tier0::Plat_FloatTime(); sendData->packetCount = 0; } sendData->packetCount++; if (sendData->packetCount >= g_pServerLimits->Cvar_sv_querylimit_per_sec->GetInt()) { spdlog::warn( "Client went over connectionless ratelimit of {} per sec with packet of type {}", g_pServerLimits->Cvar_sv_querylimit_per_sec->GetInt(), packet->data[4]); // timeout for a minute sendData->timeoutEnd = Tier0::Plat_FloatTime() + 60.0; return false; } } return ProcessConnectionlessPacket(a1, packet); } ON_DLL_LOAD_RELIESON("engine.dll", ServerLimits, ConVar, (CModule module)) { AUTOHOOK_DISPATCH() g_pServerLimits = new ServerLimitsManager; g_pServerLimits->CVar_sv_quota_stringcmdspersecond = new ConVar( "sv_quota_stringcmdspersecond", "60", FCVAR_GAMEDLL, "How many string commands per second clients are allowed to submit, 0 to disallow all string commands, -1 to disable"); g_pServerLimits->Cvar_net_chan_limit_mode = new ConVar("net_chan_limit_mode", "0", FCVAR_GAMEDLL, "The mode for netchan processing limits: 0 = warn, 1 = kick"); g_pServerLimits->Cvar_net_chan_limit_msec_per_sec = new ConVar( "net_chan_limit_msec_per_sec", "0", FCVAR_GAMEDLL, "Netchannel processing is limited to so many milliseconds, abort connection if exceeding budget"); g_pServerLimits->Cvar_sv_querylimit_per_sec = new ConVar("sv_querylimit_per_sec", "15", FCVAR_GAMEDLL, ""); g_pServerLimits->Cvar_sv_max_chat_messages_per_sec = new ConVar("sv_max_chat_messages_per_sec", "5", FCVAR_GAMEDLL, ""); Cvar_net_datablock_enabled = R2::g_pCVar->FindVar("net_datablock_enabled"); }