public void Uninstall()
{
fixed(byte *p = OriginalTargetFunctionInstructions)
DetourEngine.MemCpy(TargetFunctionAddress, (nint)p, OriginalTargetFunctionInstructions.Length);
Console.WriteLine($"Successfully uninstalled hook at: 0x{TargetFunctionAddress:X}");
}
public void Install()
{
fixed(byte *p = RelativeJmpInstructions)
DetourEngine.MemCpy(TargetFunctionAddress, (nint)p, RelativeJmpInstructions.Length);
Console.WriteLine($"Successfully installed hook at: 0x{TargetFunctionAddress:X}");
}
public X86EngineProvider(nint targetFuncAddr, nint hookedFuncAddr)
{
TargetFunctionAddress = targetFuncAddr;
HookedFunctionAddress = hookedFuncAddr;
OriginalTargetFunctionInstructions = new byte[5];
fixed(byte *p = OriginalTargetFunctionInstructions)
DetourEngine.MemCpy((nint)p, targetFuncAddr, OriginalTargetFunctionInstructions.Length);
BuildHook();
}
private unsafe nuint CreateGatewayStub(nint gatewayStubAddr, nint addrToJmpTo)
{
X64AbsoluteJmpInstructions = new byte[]
{
0x49, 0xBA, //movabs r10
0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, //[QWORD]
0x41, 0xFF, 0xE2 //jmp r10
};
fixed(byte *allocInstructions = &X64AbsoluteJmpInstructions[0])
{
*(nint *)((nint)allocInstructions + 2) = addrToJmpTo; //Write hooked QWORD function address to third byte/second instruction
DetourEngine.MemCpy(gatewayStubAddr, (nint)allocInstructions, X64AbsoluteJmpInstructions.Length); //Write instructions to the gateway stub address
}
return((nuint)X64AbsoluteJmpInstructions.Length);
}
public X64EngineProvider(nint targetFuncAddr, nint hookedFuncAddr)
{
nint gatewayStubAddr = AllocateSinglePageNearAddress(targetFuncAddr);
if (CreateGatewayStub(gatewayStubAddr, hookedFuncAddr) == 0)
{
throw new Exception($"Failed to create gateway stub at: 0x{gatewayStubAddr:X}");
}
else
{
TargetFunctionAddress = targetFuncAddr;
HookedFunctionAddress = hookedFuncAddr;
OriginalTargetFunctionInstructions = new byte[5];
fixed(byte *p = OriginalTargetFunctionInstructions)
DetourEngine.MemCpy((nint)p, targetFuncAddr, OriginalTargetFunctionInstructions.Length);
BuildHook(gatewayStubAddr);
}
}
