422 lines
13 KiB
C++
422 lines
13 KiB
C++
/*
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* =============================================================================
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* Connect Extension
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* Copyright (C) 2011 Asher Baker (asherkin). All rights reserved.
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* =============================================================================
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, version 3.0, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "extension.hpp"
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#include "CDetour/detours.h"
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#include "steam/steamclientpublic.h"
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Connect g_connect;
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SMEXT_LINK(&g_connect);
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ConVar connectVersion("connect_version", SMEXT_CONF_VERSION, FCVAR_SPONLY|FCVAR_REPLICATED|FCVAR_NOTIFY, SMEXT_CONF_DESCRIPTION " Version");
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IGameConfig *g_pGameConf = NULL;
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IForward *g_pConnectForward = NULL;
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class IClient;
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class CBaseClient;
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class CBaseServer;
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typedef enum EAuthProtocol
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{
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k_EAuthProtocolWONCertificate = 1,
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k_EAuthProtocolHashedCDKey = 2,
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k_EAuthProtocolSteam = 3,
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} EAuthProtocol;
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typedef enum EBeginAuthSessionResult
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{
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k_EBeginAuthSessionResultOK = 0, // Ticket is valid for this game and this steamID.
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k_EBeginAuthSessionResultInvalidTicket = 1, // Ticket is not valid.
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k_EBeginAuthSessionResultDuplicateRequest = 2, // A ticket has already been submitted for this steamID
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k_EBeginAuthSessionResultInvalidVersion = 3, // Ticket is from an incompatible interface version
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k_EBeginAuthSessionResultGameMismatch = 4, // Ticket is not for this game
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k_EBeginAuthSessionResultExpiredTicket = 5, // Ticket has expired
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} EBeginAuthSessionResult;
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typedef struct netadr_s
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{
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private:
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typedef enum
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{
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NA_NULL = 0,
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NA_LOOPBACK,
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NA_BROADCAST,
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NA_IP,
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} netadrtype_t;
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public:
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netadrtype_t type;
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unsigned char ip[4];
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unsigned short port;
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} netadr_t;
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char *CSteamID::Render() const
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{
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static char szSteamID[64];
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V_snprintf(szSteamID, sizeof(szSteamID), "STEAM_0:%u:%u", (m_unAccountID % 2) ? 1 : 0, (int32)m_unAccountID/2);
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return szSteamID;
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}
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class CSteam3Server
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{
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public:
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void *m_pSteamClient;
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void *m_pSteamGameServer;
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void *m_pSteamGameServerUtils;
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void *m_pSteamGameServerNetworking;
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void *m_pSteamGameServerStats;
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void *m_pSteamHTTP;
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void *m_pSteamInventory;
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void *m_pSteamUGC;
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void *m_pSteamApps;
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} *g_pSteam3Server;
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CBaseServer *g_pBaseServer = NULL;
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typedef CSteam3Server *(*Steam3ServerFunc)();
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#ifndef WIN32
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typedef void (*RejectConnectionFunc)(CBaseServer *, const netadr_t &address, int iClientChallenge, const char *pchReason);
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#else
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typedef void (__fastcall *RejectConnectionFunc)(CBaseServer *, void *, const netadr_t &address, int iClientChallenge, const char *pchReason);
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#endif
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#ifndef WIN32
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typedef void (*SetSteamIDFunc)(CBaseClient *, const CSteamID &steamID);
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#else
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typedef void (__fastcall *SetSteamIDFunc)(CBaseClient *, void *, const CSteamID &steamID);
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#endif
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Steam3ServerFunc g_pSteam3ServerFunc = NULL;
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RejectConnectionFunc g_pRejectConnectionFunc = NULL;
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SetSteamIDFunc g_pSetSteamIDFunc = NULL;
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CSteam3Server *Steam3Server()
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{
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if (!g_pSteam3ServerFunc)
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return NULL;
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return g_pSteam3ServerFunc();
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}
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void RejectConnection(const netadr_t &address, int iClientChallenge, const char *pchReason)
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{
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if (!g_pRejectConnectionFunc || !g_pBaseServer)
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return;
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#ifndef WIN32
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g_pRejectConnectionFunc(g_pBaseServer, address, iClientChallenge, pchReason);
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#else
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g_pRejectConnectionFunc(g_pBaseServer, NULL, address, iClientChallenge, pchReason);
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#endif
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}
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void SetSteamID(CBaseClient *pClient, const CSteamID &steamID)
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{
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if (!pClient || !g_pSetSteamIDFunc)
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return;
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#ifndef WIN32
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g_pSetSteamIDFunc(pClient, steamID);
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#else
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g_pSetSteamIDFunc(pClient, NULL, steamID);
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#endif
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}
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class VFuncEmptyClass{};
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int g_nBeginAuthSessionOffset = 0;
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int g_nEndAuthSessionOffset = 0;
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EBeginAuthSessionResult BeginAuthSession(const void *pAuthTicket, int cbAuthTicket, CSteamID steamID)
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{
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if (!g_pSteam3Server || !g_pSteam3Server->m_pSteamGameServer || g_nBeginAuthSessionOffset == 0)
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return k_EBeginAuthSessionResultOK;
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void **this_ptr = *(void ***)&g_pSteam3Server->m_pSteamGameServer;
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void **vtable = *(void ***)g_pSteam3Server->m_pSteamGameServer;
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void *func = vtable[g_nBeginAuthSessionOffset];
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union {
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EBeginAuthSessionResult (VFuncEmptyClass::*mfpnew)(const void *, int, CSteamID);
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#ifndef WIN32
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struct {
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void *addr;
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intptr_t adjustor;
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} s;
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} u;
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u.s.addr = func;
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u.s.adjustor = 0;
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#else
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void *addr;
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} u;
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u.addr = func;
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#endif
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return (EBeginAuthSessionResult)(reinterpret_cast<VFuncEmptyClass*>(this_ptr)->*u.mfpnew)(pAuthTicket, cbAuthTicket, steamID);
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}
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void EndAuthSession(CSteamID steamID)
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{
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if (!g_pSteam3Server || !g_pSteam3Server->m_pSteamGameServer || g_nEndAuthSessionOffset == 0)
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return;
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void **this_ptr = *(void ***)&g_pSteam3Server->m_pSteamGameServer;
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void **vtable = *(void ***)g_pSteam3Server->m_pSteamGameServer;
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void *func = vtable[g_nEndAuthSessionOffset];
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union {
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void (VFuncEmptyClass::*mfpnew)(CSteamID);
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#ifndef WIN32
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struct {
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void *addr;
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intptr_t adjustor;
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} s;
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} u;
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u.s.addr = func;
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u.s.adjustor = 0;
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#else
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void *addr;
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} u;
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u.addr = func;
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#endif
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return (void)(reinterpret_cast<VFuncEmptyClass*>(this_ptr)->*u.mfpnew)(steamID);
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}
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DECL_DETOUR(CBaseServer__ConnectClient);
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DECL_DETOUR(CBaseServer__RejectConnection)
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DECL_DETOUR(CBaseServer__CheckChallengeType);
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bool g_bEndAuthSessionOnRejectConnection = false;
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CSteamID g_lastClientSteamID;
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bool g_bSuppressCheckChallengeType = false;
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char passwordBuffer[255];
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DETOUR_DECL_MEMBER9(CBaseServer__ConnectClient, IClient *, netadr_t &, address, int, nProtocol, int, iChallenge, int, iClientChallenge, int, nAuthProtocol, const char *, pchName, const char *, pchPassword, const char *, pCookie, int, cbCookie)
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{
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if (nAuthProtocol != k_EAuthProtocolSteam)
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{
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// This is likely a SourceTV client, we don't want to interfere here.
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return DETOUR_MEMBER_CALL(CBaseServer__ConnectClient)(address, nProtocol, iChallenge, iClientChallenge, nAuthProtocol, pchName, pchPassword, pCookie, cbCookie);
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}
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g_pBaseServer = (CBaseServer *)this;
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if (pCookie == NULL || (size_t)cbCookie < sizeof(uint64))
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{
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RejectConnection(address, iClientChallenge, "#GameUI_ServerRejectInvalidSteamCertLen");
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return NULL;
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}
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char ipString[30];
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V_snprintf(ipString, sizeof(ipString), "%u.%u.%u.%u", address.ip[0], address.ip[1], address.ip[2], address.ip[3]);
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V_strncpy(passwordBuffer, pchPassword, 255);
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uint64 ullSteamID = *(uint64 *)pCookie;
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void *pvTicket = (void *)((intptr_t)pCookie + sizeof(uint64));
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int cbTicket = cbCookie - sizeof(uint64);
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g_bEndAuthSessionOnRejectConnection = true;
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g_lastClientSteamID = CSteamID(ullSteamID);
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EBeginAuthSessionResult result = BeginAuthSession(pvTicket, cbTicket, g_lastClientSteamID);
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if (result != k_EBeginAuthSessionResultOK)
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{
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RejectConnection(address, iClientChallenge, "#GameUI_ServerRejectSteam");
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return NULL;
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}
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char rejectReason[255];
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g_pConnectForward->PushString(pchName);
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g_pConnectForward->PushStringEx(passwordBuffer, 255, SM_PARAM_STRING_UTF8 | SM_PARAM_STRING_COPY, SM_PARAM_COPYBACK);
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g_pConnectForward->PushString(ipString);
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g_pConnectForward->PushString(g_lastClientSteamID.Render());
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g_pConnectForward->PushStringEx(rejectReason, 255, SM_PARAM_STRING_UTF8 | SM_PARAM_STRING_COPY, SM_PARAM_COPYBACK);
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cell_t retVal = 1;
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g_pConnectForward->Execute(&retVal);
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if (retVal == 0)
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{
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RejectConnection(address, iClientChallenge, rejectReason);
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return NULL;
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}
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pchPassword = passwordBuffer;
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g_bSuppressCheckChallengeType = true;
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return DETOUR_MEMBER_CALL(CBaseServer__ConnectClient)(address, nProtocol, iChallenge, iClientChallenge, nAuthProtocol, pchName, pchPassword, pCookie, cbCookie);
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}
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DETOUR_DECL_MEMBER3(CBaseServer__RejectConnection, void, netadr_t &, address, int, iClientChallenge, const char *, pchReason)
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{
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if (g_bEndAuthSessionOnRejectConnection)
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{
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EndAuthSession(g_lastClientSteamID);
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g_bEndAuthSessionOnRejectConnection = false;
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}
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return DETOUR_MEMBER_CALL(CBaseServer__RejectConnection)(address, iClientChallenge, pchReason);
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}
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DETOUR_DECL_MEMBER7(CBaseServer__CheckChallengeType, bool, CBaseClient *, pClient, int, nUserID, netadr_t &, address, int, nAuthProtocol, const char *, pCookie, int, cbCookie, int, iClientChallenge)
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{
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if (g_bSuppressCheckChallengeType)
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{
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g_bEndAuthSessionOnRejectConnection = false;
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SetSteamID(pClient, g_lastClientSteamID);
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g_bSuppressCheckChallengeType = false;
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return true;
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} else {
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return DETOUR_MEMBER_CALL(CBaseServer__CheckChallengeType)(pClient, nUserID, address, nAuthProtocol, pCookie, cbCookie, iClientChallenge);
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}
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}
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bool Connect::SDK_OnLoad(char *error, size_t maxlen, bool late)
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{
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char conf_error[255] = "";
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if (!gameconfs->LoadGameConfigFile("connect.games", &g_pGameConf, conf_error, sizeof(conf_error)))
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{
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if (conf_error[0])
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{
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snprintf(error, maxlen, "Could not read connect.games.txt: %s\n", conf_error);
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}
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return false;
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}
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if (!g_pGameConf->GetMemSig("CBaseServer__RejectConnection", (void **)(&g_pRejectConnectionFunc)) || !g_pRejectConnectionFunc)
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{
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snprintf(error, maxlen, "Failed to find CBaseServer__RejectConnection function.\n");
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return false;
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}
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if (!g_pGameConf->GetMemSig("CBaseClient__SetSteamID", (void **)(&g_pSetSteamIDFunc)) || !g_pSetSteamIDFunc)
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{
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snprintf(error, maxlen, "Failed to find CBaseClient__SetSteamID function.\n");
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return false;
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}
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#ifndef WIN32
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if (!g_pGameConf->GetMemSig("Steam3Server", (void **)(&g_pSteam3ServerFunc)) || !g_pSteam3ServerFunc)
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{
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snprintf(error, maxlen, "Failed to find Steam3Server function.\n");
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return false;
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}
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#else
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void *address;
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if (!g_pGameConf->GetMemSig("CBaseServer__CheckMasterServerRequestRestart", &address) || !address)
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{
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snprintf(error, maxlen, "Failed to find CBaseServer__CheckMasterServerRequestRestart function.\n");
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return false;
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}
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//META_CONPRINTF("CheckMasterServerRequestRestart: %p\n", address);
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address = (void *)((intptr_t)address + 1); // Skip CALL opcode
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intptr_t offset = (intptr_t)(*(void **)address); // Get offset
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g_pSteam3ServerFunc = (Steam3ServerFunc)((intptr_t)address + offset + sizeof(intptr_t));
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//META_CONPRINTF("Steam3Server: %p\n", g_pSteam3ServerFunc);
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#endif
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g_pSteam3Server = Steam3Server();
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if (!g_pSteam3Server)
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{
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snprintf(error, maxlen, "Unable to get Steam3Server singleton.\n");
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return false;
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}
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/*
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META_CONPRINTF("ISteamGameServer: %p\n", g_pSteam3Server->m_pSteamGameServer);
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META_CONPRINTF("ISteamUtils: %p\n", g_pSteam3Server->m_pSteamGameServerUtils);
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META_CONPRINTF("ISteamMasterServerUpdater: %p\n", g_pSteam3Server->m_pSteamMasterServerUpdater);
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META_CONPRINTF("ISteamNetworking: %p\n", g_pSteam3Server->m_pSteamGameServerNetworking);
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META_CONPRINTF("ISteamGameServerStats: %p\n", g_pSteam3Server->m_pSteamGameServerStats);
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*/
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if (!g_pGameConf->GetOffset("ISteamGameServer__BeginAuthSession", &g_nBeginAuthSessionOffset) || g_nBeginAuthSessionOffset == 0)
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{
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snprintf(error, maxlen, "Failed to find ISteamGameServer__BeginAuthSession offset.\n");
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return false;
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}
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if (!g_pGameConf->GetOffset("ISteamGameServer__EndAuthSession", &g_nEndAuthSessionOffset) || g_nEndAuthSessionOffset == 0)
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{
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snprintf(error, maxlen, "Failed to find ISteamGameServer__EndAuthSession offset.\n");
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return false;
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}
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CDetourManager::Init(g_pSM->GetScriptingEngine(), g_pGameConf);
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CREATE_DETOUR(CBaseServer__ConnectClient);
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CREATE_DETOUR(CBaseServer__RejectConnection);
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CREATE_DETOUR(CBaseServer__CheckChallengeType);
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g_pConnectForward = g_pForwards->CreateForward("OnClientPreConnectEx", ET_LowEvent, 5, NULL, Param_String, Param_String, Param_String, Param_String, Param_String);
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return true;
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}
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bool Connect::SDK_OnMetamodLoad(ISmmAPI *ismm, char *error, size_t maxlen, bool late)
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{
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GET_V_IFACE_CURRENT(GetEngineFactory, g_pCVar, ICvar, CVAR_INTERFACE_VERSION);
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ConVar_Register(0, this);
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return true;
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}
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void Connect::SDK_OnUnload()
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{
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g_pForwards->ReleaseForward(g_pConnectForward);
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gameconfs->CloseGameConfigFile(g_pGameConf);
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}
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bool Connect::SDK_OnMetamodUnload(char *error, size_t maxlen)
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{
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DESTROY_DETOUR(CBaseServer__ConnectClient);
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DESTROY_DETOUR(CBaseServer__RejectConnection);
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DESTROY_DETOUR(CBaseServer__CheckChallengeType);
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return true;
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}
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bool Connect::RegisterConCommandBase(ConCommandBase *pCommand)
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{
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META_REGCVAR(pCommand);
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return true;
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}
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