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Implement signature based hooking and small code cleanup

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Better signatures have to be created in the future to support roughly all retail r5apex modules. Maybe also load a file from the disk containing offsets for instant hooking before falling back to sigscan
This commit is contained in:
Kawe Mazidjatari 2021-04-16 14:12:39 +02:00
parent 0550d053ec
commit 4439f513d0
8 changed files with 148 additions and 54 deletions
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19
r5dev/console.cpp
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@ -5,22 +5,30 @@
#include <detours.h>
// Build 313 R5PC_J1624A_CL394493_2019_02_24_09_29_PM
void (*CommandExecute)(void * self, const char* cmd) = (void (*)(void*, const char*))0x140244900; /*48 89 5C 24 ? 57 48 83 EC 20 48 8D 0D ? ? ? ? 41 8B D8*/
#include "patterns.h"
DWORD __stdcall ProcessConsoleWorker(LPVOID);
FILE* sBuildTxt;
CHAR sBuildStr[1024];
void SetupConsole()
{
// Create the console window
if (AllocConsole() == FALSE)
{
OutputDebugString("Failed to create console window!\n");
OutputDebugStr("Failed to create console window!\n");
return;
}
// Set the window title
SetConsoleTitle("R5PC_J1624A_CL394493_2019_02_24_09_29_PM");
#pragma warning(suppress : 4996)
sBuildTxt = fopen("build.txt", "r");
if (sBuildTxt)
{
while (fgets(sBuildStr, sizeof(sBuildStr), sBuildTxt) != NULL)
fclose(sBuildTxt);
}
SetConsoleTitle(sBuildStr);
// Open input/output streams
FILE* fDummy;
@ -33,8 +41,7 @@ void SetupConsole()
CloseHandle(hThread);
}
bool (*Cvar_IsFlagSet)(int ** cvar, int flag) = (bool (*)(int**, int))0x1404C87C0;
bool Hook_Cvar_IsFlagSet(int ** cvar, int flag); /*48 8B 41 48 85 50 38*/
bool Hook_Cvar_IsFlagSet(int ** cvar, int flag);
bool Hook_Cvar_IsFlagSet(int ** cvar, int flag)
{

33
r5dev/hooks.cpp
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@ -6,34 +6,12 @@
#include "utilities.h"
#include "hooks.h"
#include "patterns.h"
// TODO pretty sloppy, all hooks / eng offets or patterns should probably go in their own header..
void* SQVM_Print = (void*)0x1410A4330; /*48 8B C4 48 89 50 10 4C 89 40 18 4C 89 48 20 53 56 57 48 81 EC ? ? ? ? 48 8B DA 48 8D 70 18 48 8B F9 E8 ? ? ? ? 48 89 74 24 ? 48 8D 54 24 ? 33 F6 4C 8B CB 41 B8 ? ? ? ? 48 89 74 24 ? 48 8B 08 48 83 C9 01 E8 ? ? ? ? 85 C0 B9 ? ? ? ? 0F 48 C1 0F B6 8C 24 ? ? ? ? 3D ? ? ? ? 48 8B 47 50*/
void* Hook_SQVM_Print(void* sqvm, char* fmt, ...);
bool (*SQVM_LoadScript)(void* sqvm, const char* script_path, const char* script_name, int flag) = (bool (*)(void*, const char*, const char*, int))0x1410A1510;
bool Hook_SQVM_LoadScript(void* sqvm, const char* script_path, const char* script_name, int flag); /*E8 ? ? ? ? 84 C0 74 1C 41 B9 ? ? ? ?*/
bool (*NET_ReceiveDatagram)(int, void*, bool) = (bool (*)(int, void*, bool))0x1402B46B0;
bool Hook_NET_ReceiveDatagram(int sock, void* inpacket, bool raw); /*E8 ? ? ? ? 84 C0 75 35 48 8B D3*/
unsigned int (*NET_SendDatagram)(SOCKET s, const char* ptxt, int len, void* netchan_maybe, bool raw) = (unsigned int (*)(SOCKET, const char*, int, void*, bool))0x1402B2C90;
unsigned int Hook_NET_SendDatagram(SOCKET s, const char* ptxt, int len, void* netchan_maybe, bool raw); /*E8 ? ? ? ? 40 88 6B 18*/
//
// TODO move to utils
//
typedef unsigned __int64 QWORD;
BOOL FileExists(LPCTSTR szPath)
{
DWORD dwAttrib = GetFileAttributes(szPath);
return (dwAttrib != INVALID_FILE_ATTRIBUTES &&
!(dwAttrib & FILE_ATTRIBUTE_DIRECTORY));
}
bool Hook_SQVM_LoadScript(void* sqvm, const char* script_path, const char* script_name, int flag);
bool Hook_NET_ReceiveDatagram(int sock, void* inpacket, bool raw);
unsigned int Hook_NET_SendDatagram(SOCKET s, const char* ptxt, int len, void* netchan_maybe, bool raw);
//
// Engine Hooks
@ -111,7 +89,7 @@ bool Hook_SQVM_LoadScript(void* sqvm, const char* script_path, const char* scrip
printf(" + Loading SQVM Script '%s' ...\n", filepath);
if (FileExists(filepath) && SQVM_LoadScript(sqvm, filepath, script_name, flag))
{
return true; // rediret to disk worked / script exists on disk..
return true; // redirect to disk worked / script exists on disk..
}
printf(" |- FAILED, loading normally / from VPK...\n");
@ -142,7 +120,6 @@ void InstallHooks()
// Failed to hook into the process, terminate
TerminateProcess(GetCurrentProcess(), 0xBAD0C0DE);
}
}
void RemoveHooks()

50
r5dev/patterns.h Normal file
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@ -0,0 +1,50 @@
#pragma once
#include <Windows.h>
#include <string>
#include "sigscan.h"
// Define the signatures or offsets to be searched and hooked
namespace
{
SigScan fScanner;
// TODO create better signatures
LONGLONG hGameConsole = fScanner.FindPattern("r5apex.exe", "\x48\x89\x5C\x24\x08\x57\x48\x83\xEC\x20\x48\x8D\x0D\x27\x61\xa5\x1e\x41\x8B\xD8", "xxxx?xxxxxxxx????xxx");
LONGLONG hGameConsoleFlag = fScanner.FindPattern("r5apex.exe", "\x48\x8B\x41\x48\x85\x50\x38", "xxxxxxx");
LONGLONG hSquirrelVMPrint = fScanner.FindPattern("r5apex.exe", "\x48\x8B\xC4\x48\x89\x50\x10\x4C\x89\x40\x18\x4C\x89\x48\x20\x53\x56\x57\x48\x81\xEC\x30\x08\x00\x00\x48\x8B\xDA\x48\x8D\x70\x18\x48\x8B\xF9\xE8\xa8", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
LONGLONG hSquirrelVMScript = fScanner.FindPattern("r5apex.exe", "\x48\x89\x5C\x24\x10\x48\x89\x74\x24\x18\x48\x89\x7C\x24\x20\x48\x89\x4C\x24\x08\x55\x41\x54\x41\x55\x41\x56\x41\x57\x48\x8D\x6C", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
LONGLONG hNetRXDatagram = fScanner.FindPattern("r5apex.exe", "\x48\x89\x74\x24\x18\x48\x89\x7C\x24\x20\x55\x41\x54\x41\x55\x41\x56\x41\x57\x48\x8D\xAC\x24\x50", "xxxxxxxxxxxxxxxxxxxxxxxx");
LONGLONG hNetTXDatagram = fScanner.FindPattern("r5apex.exe", "\x48\x89\x5C\x24\x08\x48\x89\x6C\x24\x10\x48\x89\x74\x24\x18\x57\x48\x83\xEC\x20\x48\x8B\xF9\x41\xb8\x2d", "xxxxxxxxxxxxxxxxxxxxxxxxxx");
void (*CommandExecute)(void* self, const char* cmd) = (void (*)(void*, const char*))hGameConsole; //0x140244900
/*48 89 5C 24 ? 57 48 83 EC 20 48 8D 0D ? ? ? ? 41 8B D8*/
bool (*Cvar_IsFlagSet)(int** cvar, int flag) = (bool (*)(int**, int))hGameConsoleFlag; //0x1404C87C0
/*48 8B 41 48 85 50 38*/
void* SQVM_Print = (void*)hSquirrelVMPrint; //0x1410A4330
/*48 8B C4 48 89 50 10 4C 89 40 18 4C 89 48 20 53 56 57 48 81 EC ? ? ? ? 48 8B DA 48 8D 70 18 48 8B F9 E8 ? ? ? ? 48 89 74 24 ? 48 8D 54 24 ? 33 F6 4C 8B CB 41 B8 ? ? ? ? 48 89 74 24 ? 48 8B 08 48 83 C9 01 E8 ? ? ? ? 85 C0 B9 ? ? ? ? 0F 48 C1 0F B6 8C 24 ? ? ? ? 3D ? ? ? ? 48 8B 47 50*/
bool (*SQVM_LoadScript)(void* sqvm, const char* script_path, const char* script_name, int flag) = (bool (*)(void*, const char*, const char*, int))hSquirrelVMScript; //0x1410A1510
/*E8 ? ? ? ? 84 C0 74 1C 41 B9 ? ? ? ?*/
bool (*NET_ReceiveDatagram)(int, void*, bool) = (bool (*)(int, void*, bool))hNetRXDatagram; //0x1402B46B0
/*E8 ? ? ? ? 84 C0 75 35 48 8B D3*/
unsigned int (*NET_SendDatagram)(SOCKET s, const char* ptxt, int len, void* netchan_maybe, bool raw) = (unsigned int (*)(SOCKET, const char*, int, void*, bool))hNetTXDatagram; //0x1402B2C90
/*E8 ? ? ? ? 40 88 6B 18*/
void PrintHAddress() // Test the sigscan results
{
printf("%lld\n", hGameConsole);
printf("%lld\n", hGameConsoleFlag);
printf("%lld\n", hSquirrelVMPrint);
printf("%lld\n", hSquirrelVMScript);
printf("%lld\n", hNetRXDatagram);
printf("%lld\n", hNetTXDatagram);
// TODO implement error handling when sigscan fails/result is 0
}
}

2
r5dev/r5dev.vcxproj
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@ -173,7 +173,9 @@
<ItemGroup>
<ClInclude Include="console.h" />
<ClInclude Include="hooks.h" />
<ClInclude Include="patterns.h" />
<ClInclude Include="r5dev.h" />
<ClInclude Include="sigscan.h" />
<ClInclude Include="utilities.h" />
</ItemGroup>
<ItemGroup>

6
r5dev/r5dev.vcxproj.filters
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@ -38,6 +38,12 @@
<ClInclude Include="hooks.h">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="patterns.h">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="sigscan.h">
<Filter>Header Files</Filter>
</ClInclude>
</ItemGroup>
<ItemGroup>
<None Include="r5dev.def">

41
r5dev/sigscan.h Normal file
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@ -0,0 +1,41 @@
#pragma once
#include <Psapi.h>
class SigScan
{
public:
// For getting information about the executing module
MODULEINFO GetModuleInfo(const char *szModule)
{
MODULEINFO modinfo = { 0 };
HMODULE hModule = GetModuleHandle(szModule);
if (hModule == 0)
return modinfo;
GetModuleInformation(GetCurrentProcess(), hModule, &modinfo, sizeof(MODULEINFO));
return modinfo;
}
// For finding a signature/pattern in memory of the game process
LONGLONG FindPattern(const char *module, const char *pattern, const char *mask)
{
MODULEINFO mInfo = GetModuleInfo(module);
LONGLONG base = (LONGLONG)mInfo.lpBaseOfDll;
LONGLONG size = (LONGLONG)mInfo.SizeOfImage;
LONGLONG patternLength = (LONGLONG)strlen(mask);
for (LONGLONG i = 0; i < size - patternLength; i++)
{
bool found = true;
for (LONGLONG j = 0; j < patternLength; j++)
{
found &= mask[j] == '?' || pattern[j] == *(const char*)(base + i + j);
}
if (found)
{
return base + i;
}
}
return NULL;
}
};

43
r5dev/utilities.h
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@ -3,23 +3,36 @@
#include <stdio.h>
#include <string>
static void DbgPrint(LPCSTR Format, ...)
namespace
{
CHAR Buffer[512] = { 0 };
va_list Args;
static void DbgPrint(LPCSTR Format, ...)
{
CHAR Buffer[512] = { 0 };
va_list Args;
// Get the variable arg pointer.
va_start(Args, Format);
// Get the variable arg pointer.
va_start(Args, Format);
// Format print the string.
int length = vsnprintf(Buffer, sizeof(Buffer), Format, Args);
va_end(Args);
// Format print the string.
int length = vsnprintf(Buffer, sizeof(Buffer), Format, Args);
va_end(Args);
// Output the string to the debugger.
OutputDebugString(Buffer);
}
// Output the string to the debugger.
OutputDebugString(Buffer);
}
static void HexDump(char* data, int len)
{
// todo..
}
typedef unsigned __int64 QWORD;
BOOL FileExists(LPCTSTR szPath)
{
DWORD dwAttrib = GetFileAttributes(szPath);
return (dwAttrib != INVALID_FILE_ATTRIBUTES &&
!(dwAttrib & FILE_ATTRIBUTE_DIRECTORY));
}
static void HexDump(char* data, int len)
{
// todo..
}
}

8
r5launcher/main.cpp
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@ -18,8 +18,6 @@ void PrintLastError()
LocalFree(messageBuffer);
}
// "C:\\Program Files (x86)\\Origin Games\\Apex"
bool LaunchR5Apex()
{
FILE* sLaunchParams;
@ -27,7 +25,7 @@ bool LaunchR5Apex()
CHAR sCommandDirectory[MAX_PATH];
LPSTR sCommandLine = sCommandDirectory;
#pragma warning(suppress : 4996) // Temp since fopen_s() does not parse the arguments over for some reason.
#pragma warning(suppress : 4996)
sLaunchParams = fopen("launchparams.txt", "r"); // "+exec autoexec -dev -fnf -noplatform"
BOOL result;
@ -45,7 +43,7 @@ bool LaunchR5Apex()
// Load command line arguments from a file on the disk.
if (sLaunchParams)
{
while (fgets(sArgumentSize, 1024, sLaunchParams) != NULL)
while (fgets(sArgumentSize, sizeof(sArgumentSize), sLaunchParams) != NULL)
fclose(sLaunchParams);
}
@ -104,6 +102,6 @@ bool LaunchR5Apex()
int main(int argc, char* argv[], char* envp[])
{
LaunchR5Apex();
Sleep(1000);
return 0;
}