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/**
* vim: set ts=4 :
* =============================================================================
* SourceMod Sample Extension
* Copyright (C) 2004-2008 AlliedModders LLC. All rights reserved.
* =============================================================================
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 3.0, as published by the
* Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, AlliedModders LLC gives you permission to link the
* code of this program (as well as its derivative works) to "Half-Life 2," the
* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
* by the Valve Corporation. You must obey the GNU General Public License in
* all respects for all other code used. Additionally, AlliedModders LLC grants
* this exception to all derivative works. AlliedModders LLC defines further
* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
* or <http://www.sourcemod.net/license.php>.
*
* Version: $Id$
*/
#include "extension.h"
#include "CDetour/detours.h"
#include "steam/steamclientpublic.h"
#include "steam/isteamuser.h"
#include <sm_stringhashmap.h>
/**
* @file extension.cpp
* @brief Implement extension code here.
*/
Connect g_Connect; /**< Global singleton for extension's main interface */
SMEXT_LINK(&g_Connect);
ConVar g_ConnectVersion("connect_version", SMEXT_CONF_VERSION, FCVAR_REPLICATED|FCVAR_NOTIFY, SMEXT_CONF_DESCRIPTION " Version");
IGameConfig *g_pGameConf = NULL;
IForward *g_pConnectForward = NULL;
class IClient;
class CBaseClient;
class CBaseServer;
typedef enum EAuthProtocol
{
k_EAuthProtocolWONCertificate = 1,
k_EAuthProtocolHashedCDKey = 2,
k_EAuthProtocolSteam = 3,
} EAuthProtocol;
typedef enum EBeginAuthSessionResult
{
k_EBeginAuthSessionResultOK = 0, // Ticket is valid for this game and this steamID.
k_EBeginAuthSessionResultInvalidTicket = 1, // Ticket is not valid.
k_EBeginAuthSessionResultDuplicateRequest = 2, // A ticket has already been submitted for this steamID
k_EBeginAuthSessionResultInvalidVersion = 3, // Ticket is from an incompatible interface version
k_EBeginAuthSessionResultGameMismatch = 4, // Ticket is not for this game
k_EBeginAuthSessionResultExpiredTicket = 5, // Ticket has expired
} EBeginAuthSessionResult;
typedef struct netadr_s
{
private:
typedef enum
{
NA_NULL = 0,
NA_LOOPBACK,
NA_BROADCAST,
NA_IP,
} netadrtype_t;
public:
netadrtype_t type;
unsigned char ip[4];
unsigned short port;
} netadr_t;
const char *CSteamID::Render() const
{
static char szSteamID[64];
V_snprintf(szSteamID, sizeof(szSteamID), "STEAM_0:%u:%u", (m_unAccountID % 2) ? 1 : 0, (int32)m_unAccountID/2);
return szSteamID;
}
class CSteam3Server
{
public:
void *m_pSteamGameServer;
void *m_pSteamGameServerUtils;
void *m_pSteamGameServerNetworking;
void *m_pSteamGameServerStats;
void *m_pSteamHTTP;
} *g_pSteam3Server;
CBaseServer *g_pBaseServer = NULL;
typedef CSteam3Server *(*Steam3ServerFunc)();
#ifndef WIN32
typedef void (*RejectConnectionFunc)(CBaseServer *, const netadr_t &address, int iClientChallenge, const char *pchReason);
#else
typedef void (__fastcall *RejectConnectionFunc)(CBaseServer *, void *, const netadr_t &address, int iClientChallenge, const char *pchReason);
#endif
#ifndef WIN32
typedef void (*SetSteamIDFunc)(CBaseClient *, const CSteamID &steamID);
#else
typedef void (__fastcall *SetSteamIDFunc)(CBaseClient *, void *, const CSteamID &steamID);
#endif
Steam3ServerFunc g_pSteam3ServerFunc = NULL;
RejectConnectionFunc g_pRejectConnectionFunc = NULL;
SetSteamIDFunc g_pSetSteamIDFunc = NULL;
CSteam3Server *Steam3Server()
{
if(!g_pSteam3ServerFunc)
return NULL;
return g_pSteam3ServerFunc();
}
void RejectConnection(const netadr_t &address, int iClientChallenge, const char *pchReason)
{
if(!g_pRejectConnectionFunc || !g_pBaseServer)
return;
#ifndef WIN32
g_pRejectConnectionFunc(g_pBaseServer, address, iClientChallenge, pchReason);
#else
g_pRejectConnectionFunc(g_pBaseServer, NULL, address, iClientChallenge, pchReason);
#endif
}
void SetSteamID(CBaseClient *pClient, const CSteamID &steamID)
{
if(!pClient || !g_pSetSteamIDFunc)
return;
#ifndef WIN32
g_pSetSteamIDFunc(pClient, steamID);
#else
g_pSetSteamIDFunc(pClient, NULL, steamID);
#endif
}
class VFuncEmptyClass{};
int g_nBeginAuthSessionOffset = 0;
int g_nEndAuthSessionOffset = 0;
EBeginAuthSessionResult BeginAuthSession(const void *pAuthTicket, int cbAuthTicket, CSteamID steamID)
{
if(!g_pSteam3Server || !g_pSteam3Server->m_pSteamGameServer || g_nBeginAuthSessionOffset == 0)
return k_EBeginAuthSessionResultOK;
void **this_ptr = *(void ***)&g_pSteam3Server->m_pSteamGameServer;
void **vtable = *(void ***)g_pSteam3Server->m_pSteamGameServer;
void *func = vtable[g_nBeginAuthSessionOffset];
union {
EBeginAuthSessionResult (VFuncEmptyClass::*mfpnew)(const void *, int, CSteamID);
#ifndef WIN32
struct {
void *addr;
intptr_t adjustor;
} s;
} u;
u.s.addr = func;
u.s.adjustor = 0;
#else
void *addr;
} u;
u.addr = func;
#endif
return (EBeginAuthSessionResult)(reinterpret_cast<VFuncEmptyClass*>(this_ptr)->*u.mfpnew)(pAuthTicket, cbAuthTicket, steamID);
}
void EndAuthSession(CSteamID steamID)
{
if(!g_pSteam3Server || !g_pSteam3Server->m_pSteamGameServer || g_nEndAuthSessionOffset == 0)
return;
void **this_ptr = *(void ***)&g_pSteam3Server->m_pSteamGameServer;
void **vtable = *(void ***)g_pSteam3Server->m_pSteamGameServer;
void *func = vtable[g_nEndAuthSessionOffset];
union {
void (VFuncEmptyClass::*mfpnew)(CSteamID);
#ifndef WIN32
struct {
void *addr;
intptr_t adjustor;
} s;
} u;
u.s.addr = func;
u.s.adjustor = 0;
#else
void *addr;
} u;
u.addr = func;
#endif
return (void)(reinterpret_cast<VFuncEmptyClass*>(this_ptr)->*u.mfpnew)(steamID);
}
CDetour *g_Detour_CBaseServer__ConnectClient = NULL;
CDetour *g_Detour_CBaseServer__RejectConnection = NULL;
CDetour *g_Detour_CBaseServer__CheckChallengeType = NULL;
CDetour *g_Detour_CSteam3Server__OnValidateAuthTicketResponse = NULL;
class ConnectClientStorage
{
public:
void* pThis;
netadr_t address;
int nProtocol;
int iChallenge;
int iClientChallenge;
int nAuthProtocol;
char pchName[255];
char pchPassword[255];
char pCookie[255];
int cbCookie;
uint64 ullSteamID;
bool Validated;
ConnectClientStorage() { }
ConnectClientStorage(netadr_t address, int nProtocol, int iChallenge, int iClientChallenge, int nAuthProtocol, const char *pchName, const char *pchPassword, const char *pCookie, int cbCookie)
{
this->address = address;
this->nProtocol = nProtocol;
this->iChallenge = iChallenge;
this->iClientChallenge = iClientChallenge;
this->nAuthProtocol = nAuthProtocol;
strncpy(this->pchName, pchName, sizeof(this->pchName));
strncpy(this->pchPassword, pchPassword, sizeof(this->pchPassword));
strncpy(this->pCookie, pCookie, sizeof(this->pCookie));
this->cbCookie = cbCookie;
this->Validated = false;
}
};
StringHashMap<ConnectClientStorage> g_ConnectClientStorage;
bool g_bEndAuthSessionOnRejectConnection = false;
CSteamID g_lastClientSteamID;
bool g_bSuppressCheckChallengeType = false;
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)
{
if(nAuthProtocol != k_EAuthProtocolSteam)
{
// This is likely a SourceTV client, we don't want to interfere here.
return DETOUR_MEMBER_CALL(CBaseServer__ConnectClient)(address, nProtocol, iChallenge, iClientChallenge, nAuthProtocol, pchName, pchPassword, pCookie, cbCookie);
}
g_pBaseServer = (CBaseServer *)this;
if(pCookie == NULL || (size_t)cbCookie < sizeof(uint64))
{
RejectConnection(address, iClientChallenge, "#GameUI_ServerRejectInvalidSteamCertLen");
return NULL;
}
char ipString[32];
V_snprintf(ipString, sizeof(ipString), "%u.%u.%u.%u", address.ip[0], address.ip[1], address.ip[2], address.ip[3]);
char passwordBuffer[255];
V_strncpy(passwordBuffer, pchPassword, sizeof(passwordBuffer));
uint64 ullSteamID = *(uint64 *)pCookie;
void *pvTicket = (void *)((intptr_t)pCookie + sizeof(uint64));
int cbTicket = cbCookie - sizeof(uint64);
g_bEndAuthSessionOnRejectConnection = true;
g_lastClientSteamID = CSteamID(ullSteamID);
char aSteamID[32];
V_strncpy(aSteamID, g_lastClientSteamID.Render(), sizeof(aSteamID));
// If client is in async state remove the old object and fake an async retVal
// This can happen if the async ClientPreConnectEx takes too long to be called
// and the client auto-retries.
bool AsyncWaiting = false;
ConnectClientStorage Storage;
if(g_ConnectClientStorage.retrieve(aSteamID, &Storage))
{
g_ConnectClientStorage.remove(aSteamID);
EndAuthSession(g_lastClientSteamID);
// Only wait for async on auto-retry, manual retries should go through the full chain
// Don't want to leave the client waiting forever if something breaks in the async forward
if(Storage.iClientChallenge == iClientChallenge)
AsyncWaiting = true;
}
EBeginAuthSessionResult result = BeginAuthSession(pvTicket, cbTicket, g_lastClientSteamID);
if(result != k_EBeginAuthSessionResultOK)
{
RejectConnection(address, iClientChallenge, "#GameUI_ServerRejectSteam");
return NULL;
}
char rejectReason[255];
cell_t retVal = 1;
if(AsyncWaiting)
retVal = -1; // Fake async return code when waiting for async call
else
{
g_pConnectForward->PushString(pchName);
g_pConnectForward->PushStringEx(passwordBuffer, sizeof(passwordBuffer), SM_PARAM_STRING_UTF8 | SM_PARAM_STRING_COPY, SM_PARAM_COPYBACK);
g_pConnectForward->PushString(ipString);
g_pConnectForward->PushString(aSteamID);
g_pConnectForward->PushStringEx(rejectReason, sizeof(rejectReason), SM_PARAM_STRING_UTF8 | SM_PARAM_STRING_COPY, SM_PARAM_COPYBACK);
g_pConnectForward->Execute(&retVal);
pchPassword = passwordBuffer;
}
// k_OnClientPreConnectEx_Reject
if(retVal == 0)
{
RejectConnection(address, iClientChallenge, rejectReason);
return NULL;
}
// k_OnClientPreConnectEx_Async
if(retVal == -1)
{
ConnectClientStorage Storage(address, nProtocol, iChallenge, iClientChallenge, nAuthProtocol, pchName, pchPassword, pCookie, cbCookie);
Storage.pThis = this;
Storage.ullSteamID = ullSteamID;
if(!g_ConnectClientStorage.replace(aSteamID, Storage))
{
RejectConnection(address, iClientChallenge, "Internal error.");
return NULL;
}
return NULL;
}
// k_OnClientPreConnectEx_Accept
g_bSuppressCheckChallengeType = true;
return DETOUR_MEMBER_CALL(CBaseServer__ConnectClient)(address, nProtocol, iChallenge, iClientChallenge, nAuthProtocol, pchName, pchPassword, pCookie, cbCookie);
}
DETOUR_DECL_MEMBER3(CBaseServer__RejectConnection, void, netadr_t &, address, int, iClientChallenge, const char *, pchReason)
{
if(g_bEndAuthSessionOnRejectConnection)
{
EndAuthSession(g_lastClientSteamID);
g_bEndAuthSessionOnRejectConnection = false;
}
return DETOUR_MEMBER_CALL(CBaseServer__RejectConnection)(address, iClientChallenge, pchReason);
}
DETOUR_DECL_MEMBER7(CBaseServer__CheckChallengeType, bool, CBaseClient *, pClient, int, nUserID, netadr_t &, address, int, nAuthProtocol, const char *, pCookie, int, cbCookie, int, iClientChallenge)
{
if(g_bSuppressCheckChallengeType)
{
g_bEndAuthSessionOnRejectConnection = false;
SetSteamID(pClient, g_lastClientSteamID);
g_bSuppressCheckChallengeType = false;
return true;
}
return DETOUR_MEMBER_CALL(CBaseServer__CheckChallengeType)(pClient, nUserID, address, nAuthProtocol, pCookie, cbCookie, iClientChallenge);
}
DETOUR_DECL_MEMBER1(CSteam3Server__OnValidateAuthTicketResponse, int, CSteamID *, steamID)
{
char aSteamID[32];
V_strncpy(aSteamID, steamID->Render(), sizeof(aSteamID));
ConnectClientStorage Storage;
if(g_ConnectClientStorage.retrieve(aSteamID, &Storage))
{
Storage.Validated = true;
g_ConnectClientStorage.replace(aSteamID, Storage);
}
return DETOUR_MEMBER_CALL(CSteam3Server__OnValidateAuthTicketResponse)(steamID);
}
bool Connect::SDK_OnLoad(char *error, size_t maxlen, bool late)
{
char conf_error[255] = "";
if(!gameconfs->LoadGameConfigFile("connect2.games", &g_pGameConf, conf_error, sizeof(conf_error)))
{
if(conf_error[0])
{
snprintf(error, maxlen, "Could not read connect2.games.txt: %s\n", conf_error);
}
return false;
}
if(!g_pGameConf->GetMemSig("CBaseServer__RejectConnection", (void **)(&g_pRejectConnectionFunc)) || !g_pRejectConnectionFunc)
{
snprintf(error, maxlen, "Failed to find CBaseServer__RejectConnection function.\n");
return false;
}
if(!g_pGameConf->GetMemSig("CBaseClient__SetSteamID", (void **)(&g_pSetSteamIDFunc)) || !g_pSetSteamIDFunc)
{
snprintf(error, maxlen, "Failed to find CBaseClient__SetSteamID function.\n");
return false;
}
#ifndef WIN32
if(!g_pGameConf->GetMemSig("Steam3Server", (void **)(&g_pSteam3ServerFunc)) || !g_pSteam3ServerFunc)
{
snprintf(error, maxlen, "Failed to find Steam3Server function.\n");
return false;
}
#else
void *address;
if(!g_pGameConf->GetMemSig("CBaseServer__CheckMasterServerRequestRestart", &address) || !address)
{
snprintf(error, maxlen, "Failed to find CBaseServer__CheckMasterServerRequestRestart function.\n");
return false;
}
//META_CONPRINTF("CheckMasterServerRequestRestart: %p\n", address);
address = (void *)((intptr_t)address + 1); // Skip CALL opcode
intptr_t offset = (intptr_t)(*(void **)address); // Get offset
g_pSteam3ServerFunc = (Steam3ServerFunc)((intptr_t)address + offset + sizeof(intptr_t));
//META_CONPRINTF("Steam3Server: %p\n", g_pSteam3ServerFunc);
#endif
g_pSteam3Server = Steam3Server();
if(!g_pSteam3Server)
{
snprintf(error, maxlen, "Unable to get Steam3Server singleton.\n");
return false;
}
/*
META_CONPRINTF("ISteamGameServer: %p\n", g_pSteam3Server->m_pSteamGameServer);
META_CONPRINTF("ISteamUtils: %p\n", g_pSteam3Server->m_pSteamGameServerUtils);
META_CONPRINTF("ISteamMasterServerUpdater: %p\n", g_pSteam3Server->m_pSteamMasterServerUpdater);
META_CONPRINTF("ISteamNetworking: %p\n", g_pSteam3Server->m_pSteamGameServerNetworking);
META_CONPRINTF("ISteamGameServerStats: %p\n", g_pSteam3Server->m_pSteamGameServerStats);
*/
if(!g_pGameConf->GetOffset("ISteamGameServer__BeginAuthSession", &g_nBeginAuthSessionOffset) || g_nBeginAuthSessionOffset == 0)
{
snprintf(error, maxlen, "Failed to find ISteamGameServer__BeginAuthSession offset.\n");
return false;
}
if(!g_pGameConf->GetOffset("ISteamGameServer__EndAuthSession", &g_nEndAuthSessionOffset) || g_nEndAuthSessionOffset == 0)
{
snprintf(error, maxlen, "Failed to find ISteamGameServer__EndAuthSession offset.\n");
return false;
}
CDetourManager::Init(g_pSM->GetScriptingEngine(), g_pGameConf);
g_Detour_CBaseServer__ConnectClient = DETOUR_CREATE_MEMBER(CBaseServer__ConnectClient, "CBaseServer__ConnectClient");
if(!g_Detour_CBaseServer__ConnectClient)
{
snprintf(error, maxlen, "Failed to detour CBaseServer__ConnectClient.\n");
return false;
}
g_Detour_CBaseServer__ConnectClient->EnableDetour();
g_Detour_CBaseServer__RejectConnection = DETOUR_CREATE_MEMBER(CBaseServer__RejectConnection, "CBaseServer__RejectConnection");
if(!g_Detour_CBaseServer__RejectConnection)
{
snprintf(error, maxlen, "Failed to detour CBaseServer__RejectConnection.\n");
return false;
}
g_Detour_CBaseServer__RejectConnection->EnableDetour();
g_Detour_CBaseServer__CheckChallengeType = DETOUR_CREATE_MEMBER(CBaseServer__CheckChallengeType, "CBaseServer__CheckChallengeType");
if(!g_Detour_CBaseServer__CheckChallengeType)
{
snprintf(error, maxlen, "Failed to detour CBaseServer__CheckChallengeType.\n");
return false;
}
g_Detour_CBaseServer__CheckChallengeType->EnableDetour();
g_Detour_CSteam3Server__OnValidateAuthTicketResponse = DETOUR_CREATE_MEMBER(CSteam3Server__OnValidateAuthTicketResponse, "CSteam3Server__OnValidateAuthTicketResponse");
if(!g_Detour_CSteam3Server__OnValidateAuthTicketResponse)
{
snprintf(error, maxlen, "Failed to detour CSteam3Server__OnValidateAuthTicketResponse.\n");
return false;
}
g_Detour_CSteam3Server__OnValidateAuthTicketResponse->EnableDetour();
g_pConnectForward = g_pForwards->CreateForward("OnClientPreConnectEx", ET_LowEvent, 5, NULL, Param_String, Param_String, Param_String, Param_String, Param_String);
return true;
}
bool Connect::SDK_OnMetamodLoad(ISmmAPI *ismm, char *error, size_t maxlen, bool late)
{
GET_V_IFACE_CURRENT(GetEngineFactory, g_pCVar, ICvar, CVAR_INTERFACE_VERSION);
ConVar_Register(0, this);
return true;
}
void Connect::SDK_OnUnload()
{
if(g_pConnectForward)
g_pForwards->ReleaseForward(g_pConnectForward);
if(g_Detour_CBaseServer__ConnectClient)
{
g_Detour_CBaseServer__ConnectClient->Destroy();
g_Detour_CBaseServer__ConnectClient = NULL;
}
if(g_Detour_CBaseServer__RejectConnection)
{
g_Detour_CBaseServer__RejectConnection->Destroy();
g_Detour_CBaseServer__RejectConnection = NULL;
}
if(g_Detour_CBaseServer__CheckChallengeType)
{
g_Detour_CBaseServer__CheckChallengeType->Destroy();
g_Detour_CBaseServer__CheckChallengeType = NULL;
}
if(g_Detour_CSteam3Server__OnValidateAuthTicketResponse)
{
g_Detour_CSteam3Server__OnValidateAuthTicketResponse->Destroy();
g_Detour_CSteam3Server__OnValidateAuthTicketResponse = NULL;
}
gameconfs->CloseGameConfigFile(g_pGameConf);
}
bool Connect::RegisterConCommandBase(ConCommandBase *pVar)
{
/* Always call META_REGCVAR instead of going through the engine. */
return META_REGCVAR(pVar);
}
cell_t ClientPreConnectEx(IPluginContext *pContext, const cell_t *params)
{
char *pSteamID;
pContext->LocalToString(params[1], &pSteamID);
int retVal = params[2];
char *rejectReason;
pContext->LocalToString(params[3], &rejectReason);
ConnectClientStorage Storage;
if(!g_ConnectClientStorage.retrieve(pSteamID, &Storage))
return 1;
g_ConnectClientStorage.remove(pSteamID);
g_lastClientSteamID = CSteamID(Storage.ullSteamID);
if(retVal == 0)
{
RejectConnection(Storage.address, Storage.iClientChallenge, rejectReason);
return 0;
}
g_bSuppressCheckChallengeType = true;
DETOUR_MEMBER_MCALL_ORIGINAL(CBaseServer__ConnectClient, Storage.pThis)(Storage.address, Storage.nProtocol, Storage.iChallenge, Storage.iClientChallenge,
Storage.nAuthProtocol, Storage.pchName, Storage.pchPassword, Storage.pCookie, Storage.cbCookie);
// Make sure this is always called in order to verify the client on the server
if(Storage.Validated)
DETOUR_MEMBER_MCALL_ORIGINAL(CSteam3Server__OnValidateAuthTicketResponse, g_pSteam3Server)(&g_lastClientSteamID);
return 0;
}
const sp_nativeinfo_t MyNatives[] =
{
{ "ClientPreConnectEx", ClientPreConnectEx },
{ NULL, NULL }
};
void Connect::SDK_OnAllLoaded()
{
sharesys->AddNatives(myself, MyNatives);
}