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sm-ext-CSSFixes/extension.cpp

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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 "iplayerinfo.h"
#include <sourcehook.h>
#include <sh_memory.h>
#include <IEngineTrace.h>
class CTraceFilterSimple : public CTraceFilter
{
public:
virtual bool ShouldHitEntity( IHandleEntity *pHandleEntity, int contentsMask ) = 0;
virtual void SetPassEntity( const IHandleEntity *pPassEntity ) = 0;
virtual void SetCollisionGroup( int iCollisionGroup ) = 0;
};
class CTraceFilterSkipTwoEntities : public CTraceFilterSimple
{
public:
virtual bool ShouldHitEntity( IHandleEntity *pHandleEntity, int contentsMask ) = 0;
virtual void SetPassEntity2( const IHandleEntity *pPassEntity2 ) = 0;
};
static struct SrcdsPatch
{
const char *pSignature;
const unsigned char *pPatchSignature;
const char *pPatchPattern;
const unsigned char *pPatch;
unsigned char *pOriginal;
uintptr_t pAddress;
uintptr_t pPatchAddress;
} gs_Patches[] = {
{
"_ZN7CGameUI5ThinkEv",
(unsigned char *)"\xC7\x44\x24\x04\x10\x00\x00\x00\x89\x34\x24\xE8\x00\x00\x00\x00",
"xxxxxxxxxxxx????",
(unsigned char *)"\xC7\x44\x24\x04\x10\x00\x00\x00\x89\x34\x24\x90\x90\x90\x90\x90",
0, 0, 0
},
{
"_ZN17CMovementSpeedMod13InputSpeedModER11inputdata_t",
(unsigned char *)"\xFF\x90\x8C\x05\x00\x00\x85\xC0\x0F\x85\x75\x02\x00\x00",
"xxxxxxxxxxxxxx",
(unsigned char *)"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90",
0, 0, 0
},
{
"_ZN9CCSPlayer19EntSelectSpawnPointEv",
(unsigned char *)"\x89\x1C\x24\xE8\x00\x00\x00\x00\x83\xF8\x03\x74\x4B",
"xxxx????xxxxx",
(unsigned char *)"\x89\x1C\x24\x90\x90\x90\x90\x90\x90\x90\x90\xEB\x4B",
0, 0, 0
},
{
"_ZN12CCSGameRules18NeededPlayersCheckERb",
(unsigned char *)"\x74\x0E\x8B\x83\x80\x02\x00\x00\x85\xC0\x0F\x85\x9E\x00\x00\x00\xC7\x04\x24\xAC\xF7\x87\x00\xE8\xC2\x82\x91\x00",
"xxxxxxxxxxxxxxxx????????????",
(unsigned char *)"\x0F\x85\xA8\x00\x00\x00\x8B\x83\x80\x02\x00\x00\x85\xC0\x0F\x85\x9A\x00\x00\x00\x90\x90\x90\x90\x90\x90\x90\x90",
0, 0, 0
}
};
class CBaseEntity;
struct variant_hax
{
const char *pszValue;
};
struct inputdata_t
{
// The entity that initially caused this chain of output events.
CBaseEntity *pActivator;
// The entity that fired this particular output.
CBaseEntity *pCaller;
// The data parameter for this output.
variant_hax value;
// The unique ID of the output that was fired.
int nOutputID;
};
typedef bool (*ShouldHitFunc_t)( IHandleEntity *pHandleEntity, int contentsMask );
uintptr_t FindPattern(uintptr_t BaseAddr, const unsigned char *pData, const char *pPattern, size_t MaxSize);
/**
* @file extension.cpp
* @brief Implement extension code here.
*/
CSSFixes g_Interface;
SMEXT_LINK(&g_Interface);
IGameConfig *g_pGameConf = NULL;
IForward *g_pOnRunThinkFunctions = NULL;
IForward *g_pOnRunThinkFunctionsPost = NULL;
CDetour *g_pDetour_InputTestActivator = NULL;
CDetour *g_pDetour_PostConstructor = NULL;
CDetour *g_pDetour_FindUseEntity = NULL;
CDetour *g_pDetour_CTraceFilterSimple = NULL;
CDetour *g_pDetour_MultiWaitOver = NULL;
CDetour *g_pDetour_RunThinkFunctions = NULL;
CDetour *g_pDetour_KeyValue = NULL;
CDetour *g_pDetour_FireBullets = NULL;
int g_SH_ShouldHitEntity = 0;
uintptr_t g_CTraceFilterNoNPCsOrPlayer = 0;
CTraceFilterSkipTwoEntities *g_CTraceFilterSkipTwoEntities = NULL;
DETOUR_DECL_MEMBER1(DETOUR_InputTestActivator, void, inputdata_t *, inputdata)
{
if(!inputdata || !inputdata->pActivator || !inputdata->pCaller)
return;
DETOUR_MEMBER_CALL(DETOUR_InputTestActivator)(inputdata);
}
DETOUR_DECL_MEMBER1(DETOUR_PostConstructor, void, const char *, szClassname)
{
if(strncasecmp(szClassname, "info_player_", 12) == 0)
{
CBaseEntity *pEntity = (CBaseEntity *)this;
datamap_t *pMap = gamehelpers->GetDataMap(pEntity);
typedescription_t *td = gamehelpers->FindInDataMap(pMap, "m_iEFlags");
// Spawnpoints don't need edicts...
*(uint32 *)((intptr_t)pEntity + td->fieldOffset[TD_OFFSET_NORMAL]) |= (1<<9); // EFL_SERVER_ONLY
// Only CT spawnpoints
if(strcasecmp(szClassname, "info_player_terrorist") == 0)
szClassname = "info_player_counterterrorist";
}
DETOUR_MEMBER_CALL(DETOUR_PostConstructor)(szClassname);
}
DETOUR_DECL_MEMBER2(DETOUR_KeyValue, bool, const char *, szKeyName, const char *, szValue)
{
// Fix crash bug in engine
if(strcasecmp(szKeyName, "angle") == 0)
szKeyName = "angles";
else if(strcasecmp(szKeyName, "classname") == 0 &&
strcasecmp(szValue, "info_player_terrorist") == 0)
{
// Only CT spawnpoints
szValue = "info_player_counterterrorist";
}
else if(strcasecmp(szKeyName, "teamnum") == 0 || strcasecmp(szKeyName, "teamnum") == 0 )
{
CBaseEntity *pEntity = (CBaseEntity *)this;
const char *pClassname = gamehelpers->GetEntityClassname(pEntity);
// All buyzones should be CT buyzones
if(pClassname && strcasecmp(pClassname, "func_buyzone") == 0)
szValue = "3";
}
return DETOUR_MEMBER_CALL(DETOUR_KeyValue)(szKeyName, szValue);
}
volatile bool gv_InFindUseEntity = false;
DETOUR_DECL_MEMBER0(DETOUR_FindUseEntity, CBaseEntity *)
{
// Signal CTraceFilterSimple that we are in FindUseEntity
gv_InFindUseEntity = true;
CBaseEntity *pEntity = DETOUR_MEMBER_CALL(DETOUR_FindUseEntity)();
gv_InFindUseEntity = false;
return pEntity;
}
SH_DECL_HOOK2(CTraceFilterSkipTwoEntities, ShouldHitEntity, SH_NOATTRIB, 0, bool, IHandleEntity *, int);
volatile bool gv_InFireBullets = false;
volatile int gv_FireBulletPlayerTeam = 0;
bool ShouldHitEntity(IHandleEntity *pHandleEntity, int contentsMask)
{
if(!gv_InFireBullets)
return true;
if(META_RESULT_ORIG_RET(bool) == false)
return false;
IServerUnknown *pUnk = (IServerUnknown *)pHandleEntity;
IServerNetworkable *pNetworkAble = pUnk->GetNetworkable();
if(!pNetworkAble)
RETURN_META_VALUE(MRES_IGNORED, true);
edict_t *pEdict = pNetworkAble->GetEdict();
if(!pEdict)
RETURN_META_VALUE(MRES_IGNORED, true);
IGamePlayer *pPlayer = playerhelpers->GetGamePlayer(pEdict);
if(!pPlayer)
RETURN_META_VALUE(MRES_IGNORED, true);
IPlayerInfo *pInfo = pPlayer->GetPlayerInfo();
if(!pInfo)
RETURN_META_VALUE(MRES_IGNORED, true);
int iTeam = pInfo->GetTeamIndex();
if(iTeam == gv_FireBulletPlayerTeam)
RETURN_META_VALUE(MRES_SUPERCEDE, false);
RETURN_META_VALUE(MRES_IGNORED, true);
}
DETOUR_DECL_STATIC7(DETOUR_FireBullets, void, int, iPlayerIndex, const Vector *, vOrigin, const QAngle *, vAngles, int, iWeaponID, int, iMode, int, iSeed, float, flSpread)
{
if(iPlayerIndex <= 0 || iPlayerIndex > playerhelpers->GetMaxClients())
return DETOUR_STATIC_CALL(DETOUR_FireBullets)(iPlayerIndex, vOrigin, vAngles, iWeaponID, iMode, iSeed, flSpread);
IGamePlayer *pPlayer = playerhelpers->GetGamePlayer(iPlayerIndex);
if(!pPlayer)
return DETOUR_STATIC_CALL(DETOUR_FireBullets)(iPlayerIndex, vOrigin, vAngles, iWeaponID, iMode, iSeed, flSpread);
IPlayerInfo *pInfo = pPlayer->GetPlayerInfo();
if(!pInfo)
return DETOUR_STATIC_CALL(DETOUR_FireBullets)(iPlayerIndex, vOrigin, vAngles, iWeaponID, iMode, iSeed, flSpread);
gv_FireBulletPlayerTeam = pInfo->GetTeamIndex();
gv_InFireBullets = true;
DETOUR_STATIC_CALL(DETOUR_FireBullets)(iPlayerIndex, vOrigin, vAngles, iWeaponID, iMode, iSeed, flSpread);
gv_InFireBullets = false;
}
DETOUR_DECL_MEMBER3(DETOUR_CTraceFilterSimple, void, const IHandleEntity *, passedict, int, collisionGroup, ShouldHitFunc_t, pExtraShouldHitFunc)
{
DETOUR_MEMBER_CALL(DETOUR_CTraceFilterSimple)(passedict, collisionGroup, pExtraShouldHitFunc);
// If we're in FindUseEntity right now then switch out the VTable
if(gv_InFindUseEntity)
*(uintptr_t *)this = g_CTraceFilterNoNPCsOrPlayer;
}
DETOUR_DECL_MEMBER0(DETOUR_MultiWaitOver, void)
{
CBaseEntity *pEntity = (CBaseEntity *)this;
edict_t *pEdict = gamehelpers->EdictOfIndex(gamehelpers->EntityToBCompatRef(pEntity));
if(pEdict)
engine->TriggerMoved(pEdict, true);
DETOUR_MEMBER_CALL(DETOUR_MultiWaitOver)();
}
DETOUR_DECL_STATIC1(DETOUR_RunThinkFunctions, void, bool, simulating)
{
g_pOnRunThinkFunctions->PushCell(simulating);
g_pOnRunThinkFunctions->Execute();
DETOUR_STATIC_CALL(DETOUR_RunThinkFunctions)(simulating);
g_pOnRunThinkFunctionsPost->PushCell(simulating);
g_pOnRunThinkFunctionsPost->Execute();
}
bool CSSFixes::SDK_OnLoad(char *error, size_t maxlength, bool late)
{
char conf_error[255] = "";
if(!gameconfs->LoadGameConfigFile("CSSFixes", &g_pGameConf, conf_error, sizeof(conf_error)))
{
if(conf_error[0])
snprintf(error, maxlength, "Could not read CSSFixes.txt: %s", conf_error);
return false;
}
CDetourManager::Init(g_pSM->GetScriptingEngine(), g_pGameConf);
g_pDetour_InputTestActivator = DETOUR_CREATE_MEMBER(DETOUR_InputTestActivator, "CBaseFilter_InputTestActivator");
if(g_pDetour_InputTestActivator == NULL)
{
snprintf(error, maxlength, "Could not create detour for CBaseFilter_InputTestActivator");
SDK_OnUnload();
return false;
}
g_pDetour_PostConstructor = DETOUR_CREATE_MEMBER(DETOUR_PostConstructor, "CBaseEntity_PostConstructor");
if(g_pDetour_PostConstructor == NULL)
{
snprintf(error, maxlength, "Could not create detour for CBaseEntity_PostConstructor");
SDK_OnUnload();
return false;
}
g_pDetour_FindUseEntity = DETOUR_CREATE_MEMBER(DETOUR_FindUseEntity, "CBasePlayer_FindUseEntity");
if(g_pDetour_FindUseEntity == NULL)
{
snprintf(error, maxlength, "Could not create detour for CBasePlayer_FindUseEntity");
SDK_OnUnload();
return false;
}
g_pDetour_CTraceFilterSimple = DETOUR_CREATE_MEMBER(DETOUR_CTraceFilterSimple, "CTraceFilterSimple_CTraceFilterSimple");
if(g_pDetour_CTraceFilterSimple == NULL)
{
snprintf(error, maxlength, "Could not create detour for CTraceFilterSimple_CTraceFilterSimple");
SDK_OnUnload();
return false;
}
g_pDetour_MultiWaitOver = DETOUR_CREATE_MEMBER(DETOUR_MultiWaitOver, "CTriggerMultiple_MultiWaitOver");
if(g_pDetour_MultiWaitOver == NULL)
{
snprintf(error, maxlength, "Could not create detour for CTriggerMultiple_MultiWaitOver");
SDK_OnUnload();
return false;
}
g_pDetour_RunThinkFunctions = DETOUR_CREATE_STATIC(DETOUR_RunThinkFunctions, "Physics_RunThinkFunctions");
if(g_pDetour_RunThinkFunctions == NULL)
{
snprintf(error, maxlength, "Could not create detour for Physics_RunThinkFunctions");
SDK_OnUnload();
return false;
}
g_pDetour_KeyValue = DETOUR_CREATE_MEMBER(DETOUR_KeyValue, "CBaseEntity_KeyValue");
if(g_pDetour_KeyValue == NULL)
{
snprintf(error, maxlength, "Could not create detour for CBaseEntity_KeyValue");
SDK_OnUnload();
return false;
}
g_pDetour_FireBullets = DETOUR_CREATE_STATIC(DETOUR_FireBullets, "FX_FireBullets");
if(g_pDetour_FireBullets == NULL)
{
snprintf(error, maxlength, "Could not create detour for FX_FireBullets");
SDK_OnUnload();
return false;
}
g_pDetour_InputTestActivator->EnableDetour();
g_pDetour_PostConstructor->EnableDetour();
g_pDetour_FindUseEntity->EnableDetour();
g_pDetour_CTraceFilterSimple->EnableDetour();
g_pDetour_MultiWaitOver->EnableDetour();
g_pDetour_RunThinkFunctions->EnableDetour();
g_pDetour_KeyValue->EnableDetour();
g_pDetour_FireBullets->EnableDetour();
// Find VTable for CTraceFilterSkipTwoEntities
uintptr_t pCTraceFilterSkipTwoEntities;
if(!g_pGameConf->GetMemSig("CTraceFilterSkipTwoEntities", (void **)(&pCTraceFilterSkipTwoEntities)) || !pCTraceFilterSkipTwoEntities)
{
snprintf(error, maxlength, "Failed to find CTraceFilterSkipTwoEntities.\n");
SDK_OnUnload();
return false;
}
// First function in VTable
g_CTraceFilterSkipTwoEntities = (CTraceFilterSkipTwoEntities *)(pCTraceFilterSkipTwoEntities + 8);
// Find VTable for CTraceFilterNoNPCsOrPlayer
uintptr_t pCTraceFilterNoNPCsOrPlayer;
if(!g_pGameConf->GetMemSig("CTraceFilterNoNPCsOrPlayer", (void **)(&pCTraceFilterNoNPCsOrPlayer)) || !pCTraceFilterNoNPCsOrPlayer)
{
snprintf(error, maxlength, "Failed to find CTraceFilterNoNPCsOrPlayer.\n");
SDK_OnUnload();
return false;
}
// First function in VTable
g_CTraceFilterNoNPCsOrPlayer = pCTraceFilterNoNPCsOrPlayer + 8;
g_SH_ShouldHitEntity = SH_ADD_DVPHOOK(CTraceFilterSkipTwoEntities, ShouldHitEntity, g_CTraceFilterSkipTwoEntities, SH_STATIC(ShouldHitEntity), true);
void *pServerSo = dlopen("cstrike/bin/server_srv.so", RTLD_NOW);
if(!pServerSo)
{
snprintf(error, maxlength, "Could not dlopen server_srv.so");
SDK_OnUnload();
return false;
}
// Apply all patches
for(size_t i = 0; i < sizeof(gs_Patches) / sizeof(*gs_Patches); i++)
{
struct SrcdsPatch *pPatch = &gs_Patches[i];
int PatchLen = strlen(pPatch->pPatchPattern);
pPatch->pAddress = (uintptr_t)memutils->ResolveSymbol(pServerSo, pPatch->pSignature);
if(!pPatch->pAddress)
{
snprintf(error, maxlength, "Could not find symbol: %s", pPatch->pSignature);
dlclose(pServerSo);
SDK_OnUnload();
return false;
}
pPatch->pPatchAddress = FindPattern(pPatch->pAddress, pPatch->pPatchSignature, pPatch->pPatchPattern, 1024);
if(!pPatch->pPatchAddress)
{
snprintf(error, maxlength, "Could not find patch signature for symbol: %s", pPatch->pSignature);
dlclose(pServerSo);
SDK_OnUnload();
return false;
}
pPatch->pOriginal = (unsigned char *)malloc(PatchLen * sizeof(unsigned char));
SourceHook::SetMemAccess((void *)pPatch->pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_WRITE|SH_MEM_EXEC);
for(int j = 0; j < PatchLen; j++)
{
pPatch->pOriginal[j] = *(unsigned char *)(pPatch->pPatchAddress + j);
*(unsigned char *)(pPatch->pPatchAddress + j) = pPatch->pPatch[j];
}
SourceHook::SetMemAccess((void *)pPatch->pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_EXEC);
}
dlclose(pServerSo);
g_pOnRunThinkFunctions = forwards->CreateForward("OnRunThinkFunctions", ET_Ignore, 1, NULL, Param_Cell);
g_pOnRunThinkFunctionsPost = forwards->CreateForward("OnRunThinkFunctionsPost", ET_Ignore, 1, NULL, Param_Cell);
return true;
}
void CSSFixes::SDK_OnUnload()
{
if(g_pDetour_InputTestActivator != NULL)
{
g_pDetour_InputTestActivator->Destroy();
g_pDetour_InputTestActivator = NULL;
}
if(g_pDetour_PostConstructor != NULL)
{
g_pDetour_PostConstructor->Destroy();
g_pDetour_PostConstructor = NULL;
}
if(g_pDetour_FindUseEntity != NULL)
{
g_pDetour_FindUseEntity->Destroy();
g_pDetour_FindUseEntity = NULL;
}
if(g_pDetour_CTraceFilterSimple != NULL)
{
g_pDetour_CTraceFilterSimple->Destroy();
g_pDetour_CTraceFilterSimple = NULL;
}
if(g_pDetour_MultiWaitOver != NULL)
{
g_pDetour_MultiWaitOver->Destroy();
g_pDetour_MultiWaitOver = NULL;
}
if(g_pDetour_RunThinkFunctions != NULL)
{
g_pDetour_RunThinkFunctions->Destroy();
g_pDetour_RunThinkFunctions = NULL;
}
if(g_pDetour_KeyValue != NULL)
{
g_pDetour_KeyValue->Destroy();
g_pDetour_KeyValue = NULL;
}
if(g_pDetour_FireBullets != NULL)
{
g_pDetour_FireBullets->Destroy();
g_pDetour_FireBullets = NULL;
}
if(g_pOnRunThinkFunctions != NULL)
{
forwards->ReleaseForward(g_pOnRunThinkFunctions);
g_pOnRunThinkFunctions = NULL;
}
if(g_pOnRunThinkFunctionsPost != NULL)
{
forwards->ReleaseForward(g_pOnRunThinkFunctionsPost);
g_pOnRunThinkFunctionsPost = NULL;
}
if(g_SH_ShouldHitEntity)
SH_REMOVE_HOOK_ID(g_SH_ShouldHitEntity);
gameconfs->CloseGameConfigFile(g_pGameConf);
// Revert all applied patches
for(size_t i = 0; i < sizeof(gs_Patches) / sizeof(*gs_Patches); i++)
{
struct SrcdsPatch *pPatch = &gs_Patches[i];
int PatchLen = strlen(pPatch->pPatchPattern);
if(!pPatch->pOriginal)
continue;
SourceHook::SetMemAccess((void *)pPatch->pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_WRITE|SH_MEM_EXEC);
for(int j = 0; j < PatchLen; j++)
{
*(unsigned char *)(pPatch->pPatchAddress + j) = pPatch->pOriginal[j];
}
SourceHook::SetMemAccess((void *)pPatch->pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_EXEC);
free(pPatch->pOriginal);
pPatch->pOriginal = NULL;
}
}
bool CSSFixes::SDK_OnMetamodLoad(ISmmAPI *ismm, char *error, size_t maxlen, bool late)
{
GET_V_IFACE_CURRENT(GetEngineFactory, engine, IVEngineServer, INTERFACEVERSION_VENGINESERVER);
return true;
}
uintptr_t FindPattern(uintptr_t BaseAddr, const unsigned char *pData, const char *pPattern, size_t MaxSize)
{
unsigned char *pMemory;
uintptr_t PatternLen = strlen(pPattern);
pMemory = reinterpret_cast<unsigned char *>(BaseAddr);
for(uintptr_t i = 0; i < MaxSize; i++)
{
uintptr_t Matches = 0;
while(*(pMemory + i + Matches) == pData[Matches] || pPattern[Matches] != 'x')
{
Matches++;
if(Matches == PatternLen)
return (uintptr_t)(pMemory + i);
}
}
return 0x00;
}
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