h4sard/sm-ext-CSSFixes
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fix signatures for cs:s update (thanks to Neon)

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add new function call scanning/patching feature + multiple signature patching
This commit is contained in:
BotoX 2021-07-03 23:04:06 +02:00
parent 7b7821f65b
commit 2147cab2f4
1 changed files with 133 additions and 81 deletions
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214
extension.cpp
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@ -91,15 +91,26 @@ public:
static struct SrcdsPatch
{
const char *pSignature;
const unsigned char *pPatchSignature;
const char *pPatchPattern;
const unsigned char *pPatch;
const char *pSignature; // function symbol
const unsigned char *pPatchSignature; // original opcode signature | function symbol for functionCall = true
const char *pPatchPattern; // pattern = x/?, ? = ignore signature
const unsigned char *pPatch; // replace with bytes
const char *pLibrary; // library of function symbol pSignature
unsigned char *pOriginal;
uintptr_t pAddress;
uintptr_t pPatchAddress;
bool engine;
int range = 0x400; // search range: scan up to this many bytes for the signature
int occurrences = 1; // maximum(!) number of occurences to patch
bool functionCall = false; // true = FindFunctionCall (pPatchSignature = function symbol) | false = FindPattern
const char *pFunctionLibrary = ""; // library of function symbol pPatchSignature for functionCall = true
struct Restore
{
unsigned char *pOriginal = NULL;
uintptr_t pPatchAddress = 0;
struct Restore *pNext = NULL;
} *pRestore = NULL;
uintptr_t pAddress = 0;
uintptr_t pSignatureAddress = 0;
} gs_Patches[] = {
// 0: game_ui should not apply FL_ONTRAIN flag, else client prediction turns off
{
@ -107,23 +118,23 @@ static struct SrcdsPatch
(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, false
"cstrike/bin/server_srv.so"
},
// 1: player_speedmod should not turn off flashlight
{
"_ZN17CMovementSpeedMod13InputSpeedModER11inputdata_t",
(unsigned char *)"\xFF\x90\x8C\x05\x00\x00\x85\xC0\x0F\x85\x75\x02\x00\x00",
(unsigned char *)"\xFF\x90\x8C\x05\x00\x00\x85\xC0\x0F\x85\x85\x02\x00\x00",
"xxxxxxxxxxxxxx",
(unsigned char *)"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90",
0, 0, 0, false
"cstrike/bin/server_srv.so"
},
// 2: only select CT spawnpoints
{
"_ZN9CCSPlayer19EntSelectSpawnPointEv",
(unsigned char *)"\x89\x1C\x24\xE8\x00\x00\x00\x00\x83\xF8\x03\x74\x4B",
(unsigned char *)"\x89\x1C\x24\xE8\x00\x00\x00\x00\x83\xF8\x03\x74\x6B",
"xxxx????xxxxx",
(unsigned char *)"\x89\x1C\x24\x90\x90\x90\x90\x90\x90\x90\x90\xEB\x4B",
0, 0, 0, false
(unsigned char *)"\x89\x1C\x24\x90\x90\x90\x90\x90\x90\x90\x90\xEB\x6B",
"cstrike/bin/server_srv.so"
},
// 3: don't check if we have T spawns
{
@ -131,7 +142,7 @@ static struct SrcdsPatch
(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, false
"cstrike/bin/server_srv.so"
},
// 5: disable alive check in point_viewcontrol->Disable
{
@ -139,23 +150,23 @@ static struct SrcdsPatch
(unsigned char *)"\x8B\x10\x89\x04\x24\xFF\x92\x08\x01\x00\x00\x84\xC0\x0F\x84\x58\xFF\xFF\xFF",
"xxxxxxx??xxxxxx?xxx",
(unsigned char *)"\x8B\x10\x89\x04\x24\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90",
0, 0, 0, false
"cstrike/bin/server_srv.so"
},
// 6: disable player->m_takedamage = DAMAGE_NO in point_viewcontrol->Enable
{
"_ZN14CTriggerCamera6EnableEv",
(unsigned char *)"\x31\xFF\x80\xBF\xFD\x00\x00\x00\x00\x0F\x85\x96\x03\x00\x00",
(unsigned char *)"\x31\xF6\x80\xBE\xFD\x00\x00\x00\x00\x0F\x85\x8D\x03\x00\x00",
"xxxx?xxxxxx??xx",
(unsigned char *)"\x31\xFF\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90",
0, 0, 0, false
(unsigned char *)"\x31\xF6\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90",
"cstrike/bin/server_srv.so"
},
// 7: disable player->m_takedamage = m_nOldTakeDamage in point_viewcontrol->Disable
{
"_ZN14CTriggerCamera7DisableEv",
(unsigned char *)"\x89\xF9\x38\x8E\xFD\x00\x00\x00\x0F\x84\xAC\xFD\xFF\xFF",
(unsigned char *)"\x89\xF9\x38\x8E\xFD\x00\x00\x00\x0F\x84\xCA\xFD\xFF\xFF",
"xxxx?xxxxxxxxx",
(unsigned char *)"\x89\xF9\x38\x8E\xFD\x00\x00\x00\x90\xE9\xAC\xFD\xFF\xFF",
0, 0, 0, false
(unsigned char *)"\x89\xF9\x38\x8E\xFD\x00\x00\x00\x90\xE9\xCA\xFD\xFF\xFF",
"cstrike/bin/server_srv.so"
},
// 8: userinfo stringtable don't write fakeclient field
{
@ -163,24 +174,28 @@ static struct SrcdsPatch
(unsigned char *)"\xFF\x50\x70\x88\x46\x6C",
"xxxxxx",
(unsigned char *)"\x90\x90\x90\x90\x90\x90",
0, 0, 0, true
"bin/engine_srv.so"
},
// 10: fix server lagging resulting from too many ConMsgs due to packet spam ("%s:corrupted packet %i at %i\n")
// 9: fix server lagging resulting from too many ConMsgs due to packet spam
{
"_ZN8CNetChan19ProcessPacketHeaderEP11netpacket_s",
(unsigned char *)"\x89\x44\x24\x04\x89\x5C\x24\x0C\x89\x54\x24\x08\xE8\xE0\xAB\x22\x00",
"xxxxxxxxxxxxx????",
(unsigned char *)"\x89\x44\x24\x04\x89\x5C\x24\x0C\x89\x54\x24\x08\x90\x90\x90\x90\x90",
0, 0, 0, true
(unsigned char *)"_Z6ConMsgPKcz",
"xxxxx",
(unsigned char *)"\x90\x90\x90\x90\x90",
"bin/engine_srv.so",
0x7d1, 100,
true, "bin/libtier0_srv.so"
},
// 11: fix server lagging resulting from too many ConMsgs due to packet spam ("Invalid split packet length %i\n")
// 10: fix server lagging resulting from too many ConMsgs due to packet spam
{
"_Z11NET_GetLongiP11netpacket_s",
(unsigned char *)"\x89\x44\x24\x04\xC7\x04\x24\x98\x64\x24\x00\xE8\xFE\x20\x22\x00\x89\xF8\x8B\x5D\xF4\x8B\x75\xF8\x8B\x7D\xFC",
"xxxx???????x????xxxxxxxxxxx",
(unsigned char *)"\x89\x44\x24\x04\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x89\xF8\x8B\x5D\xF4\x8B\x75\xF8\x8B\x7D\xFC",
0, 0, 0, true
}
(unsigned char *)"Msg",
"xxxxx",
(unsigned char *)"\x90\x90\x90\x90\x90",
"bin/engine_srv.so",
0x800, 100,
true, "bin/libtier0_srv.so"
},
};
class CBaseEntity;
@ -542,63 +557,92 @@ bool CSSFixes::SDK_OnLoad(char *error, size_t maxlength, bool late)
g_SH_SkipTwoEntitiesShouldHitEntity = SH_ADD_DVPHOOK(CTraceFilterSkipTwoEntities, ShouldHitEntity, g_CTraceFilterSkipTwoEntities, SH_STATIC(ShouldHitEntity), true);
g_SH_SimpleShouldHitEntity = SH_ADD_DVPHOOK(CTraceFilterSimple, ShouldHitEntity, g_CTraceFilterSimple, 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;
}
void *pEngineSo = dlopen("bin/engine_srv.so", RTLD_NOW);
if(!pEngineSo)
{
snprintf(error, maxlength, "Could not dlopen engine_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);
void *pBinary = pPatch->engine ? pEngineSo : pServerSo;
void *pBinary = dlopen(pPatch->pLibrary, RTLD_NOW);
if(!pBinary)
{
snprintf(error, maxlength, "Could not dlopen %s", pPatch->pLibrary);
SDK_OnUnload();
return false;
}
pPatch->pAddress = (uintptr_t)memutils->ResolveSymbol(pBinary, pPatch->pSignature);
dlclose(pBinary);
if(!pPatch->pAddress)
{
snprintf(error, maxlength, "Could not find symbol: %s", pPatch->pSignature);
dlclose(pServerSo);
dlclose(pEngineSo);
snprintf(error, maxlength, "Could not find symbol: %s in %s (%p)",
pPatch->pSignature, pPatch->pLibrary, pBinary);
SDK_OnUnload();
return false;
}
pPatch->pPatchAddress = FindPattern(pPatch->pAddress, pPatch->pPatchSignature, pPatch->pPatchPattern, 0x1000);
if(!pPatch->pPatchAddress)
SrcdsPatch::Restore **ppRestore = &pPatch->pRestore;
if(pPatch->functionCall)
{
snprintf(error, maxlength, "Could not find patch signature for symbol: %s", pPatch->pSignature);
dlclose(pServerSo);
dlclose(pEngineSo);
SDK_OnUnload();
return false;
void *pFunctionBinary = dlopen(pPatch->pFunctionLibrary, RTLD_NOW);
if(!pFunctionBinary)
{
snprintf(error, maxlength, "Could not dlopen %s", pPatch->pFunctionLibrary);
SDK_OnUnload();
return false;
}
pPatch->pSignatureAddress = (uintptr_t)memutils->ResolveSymbol(pFunctionBinary, (char *)pPatch->pPatchSignature);
dlclose(pFunctionBinary);
if(!pPatch->pSignatureAddress)
{
snprintf(error, maxlength, "Could not find patch signature symbol: %s in %s (%p)",
(char *)pPatch->pPatchSignature, pPatch->pFunctionLibrary, pFunctionBinary);
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++)
uintptr_t ofs = 0;
int found;
for(found = 0; found < pPatch->occurrences; found++)
{
pPatch->pOriginal[j] = *(unsigned char *)(pPatch->pPatchAddress + j);
*(unsigned char *)(pPatch->pPatchAddress + j) = pPatch->pPatch[j];
uintptr_t pPatchAddress;
if(pPatch->functionCall)
pPatchAddress = FindFunctionCall(pPatch->pAddress + ofs, pPatch->pSignatureAddress, pPatch->range - ofs);
else
pPatchAddress = FindPattern(pPatch->pAddress + ofs, pPatch->pPatchSignature, pPatch->pPatchPattern, pPatch->range - ofs);
if(!pPatchAddress)
{
if(found)
break;
snprintf(error, maxlength, "Could not find patch signature for symbol: %s", pPatch->pSignature);
SDK_OnUnload();
return false;
}
ofs = pPatchAddress - pPatch->pAddress + PatchLen;
// Create restore object
*ppRestore = (SrcdsPatch::Restore *)new SrcdsPatch::Restore();
SrcdsPatch::Restore *pRestore = *ppRestore;
pRestore->pPatchAddress = pPatchAddress;
pRestore->pOriginal = (unsigned char *)malloc(PatchLen * sizeof(unsigned char));
SourceHook::SetMemAccess((void *)pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_WRITE|SH_MEM_EXEC);
for(int j = 0; j < PatchLen; j++)
{
pRestore->pOriginal[j] = *(unsigned char *)(pPatchAddress + j);
*(unsigned char *)(pPatchAddress + j) = pPatch->pPatch[j];
}
SourceHook::SetMemAccess((void *)pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_EXEC);
ppRestore = &((*ppRestore)->pNext);
}
SourceHook::SetMemAccess((void *)pPatch->pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_EXEC);
}
dlclose(pServerSo);
dlclose(pEngineSo);
return true;
}
@ -672,18 +716,26 @@ void CSSFixes::SDK_OnUnload()
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++)
SrcdsPatch::Restore *pRestore = pPatch->pRestore;
while(pRestore)
{
*(unsigned char *)(pPatch->pPatchAddress + j) = pPatch->pOriginal[j];
}
SourceHook::SetMemAccess((void *)pPatch->pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_EXEC);
if(!pRestore->pOriginal)
break;
free(pPatch->pOriginal);
pPatch->pOriginal = NULL;
SourceHook::SetMemAccess((void *)pRestore->pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_WRITE|SH_MEM_EXEC);
for(int j = 0; j < PatchLen; j++)
{
*(unsigned char *)(pRestore->pPatchAddress + j) = pRestore->pOriginal[j];
}
SourceHook::SetMemAccess((void *)pRestore->pPatchAddress, PatchLen, SH_MEM_READ|SH_MEM_EXEC);
free(pRestore->pOriginal);
pRestore->pOriginal = NULL;
void *freeMe = pRestore;
pRestore = pRestore->pNext;
free(freeMe);
}
}
}