private static void Create(Hook <TFunction> hook, ReverseWrapper <TFunction> reverseWrapper, long functionAddress, int minHookLength = -1)
{
Mutex.MakeHookMutex.WaitOne();
/* Create Convention => CDECL Wrapper. */
List <byte> jumpOpcodes = Utilities.AssembleAbsoluteJump(reverseWrapper.WrapperPointer, true).ToList();
/* Calculate Hook Length (Unless Explicit) */
if (minHookLength == -1)
{
minHookLength = Utilities.GetHookLength((IntPtr)functionAddress, jumpOpcodes.Count, ArchitectureMode.x86_64);
}
// Sometimes our hook can be larger than the amount of bytes taken by the jmp opcode.
// We need to fill the remaining bytes with NOPs.
if (minHookLength > jumpOpcodes.Count)
{
int nopBytes = minHookLength - jumpOpcodes.Count;
for (int x = 0; x < nopBytes; x++)
{
jumpOpcodes.Add(0x90);
}
}
/* Get bytes from original function prologue and patch them. */
CurrentProcess.SafeReadRaw((IntPtr)functionAddress, out byte[] originalFunction, minHookLength);
var functionPatcher = new FunctionPatcher(ArchitectureMode.x86_64);
var functionPatch = functionPatcher.Patch(originalFunction.ToList(), (IntPtr)functionAddress);
IntPtr hookEndAddress = (IntPtr)(functionAddress + minHookLength);
functionPatch.NewFunction.AddRange(Utilities.AssembleAbsoluteJump(hookEndAddress, true));
/* Second wave of patching. */
var icedPatcher = new IcedPatcher(true, functionPatch.NewFunction.ToArray(), (IntPtr)functionAddress);
/* Create Hook instance. */
hook.OriginalFunctionAddress = icedPatcher.GetFunctionAddress();
hook.OriginalFunction = Wrapper.Create <TFunction>((long)icedPatcher.GetFunctionAddress(), out IntPtr originalFunctionWrapperAddress);
hook.OriginalFunctionWrapperAddress = originalFunctionWrapperAddress;
hook.ReverseWrapper = reverseWrapper;
hook._otherHookPatches = functionPatch.Patches;
hook._hookPatch = new Patch((IntPtr)functionAddress, jumpOpcodes.ToArray());
Mutex.MakeHookMutex.ReleaseMutex();
}
private static void Create(Hook <TFunction> hook, ReverseWrapper <TFunction> reverseWrapper, long functionAddress, int minHookLength = -1)
{
/*
* === Hook Summary ===
*
* A. Insert Absolute Jump to ReverseWrapper (Convention => CDECL Marshaller)
* A1. Backup original bytes and patch between start and end of JMP for (B).
*
* B. Setup Wrapper to call original function (CDECL => Convention Marshaller)
* B1. Take bytes backed up from A, and create stub function with those
* bytes and JMP to end of hook.
* B2. Assign OriginalFunction to that function stub.
*/
Mutex.MakeHookMutex.WaitOne();
/* Create Convention => CDECL Wrapper. */
List <byte> jumpOpcodes = Utilities.AssembleAbsoluteJump(reverseWrapper.WrapperPointer, false).ToList();
/* Calculate Hook Length (Unless Explicit) */
if (minHookLength == -1)
{
minHookLength = Utilities.GetHookLength((IntPtr)functionAddress, jumpOpcodes.Count, ArchitectureMode.x86_32);
}
// Sometimes our hook can be larger than the amount of bytes taken by the jmp opcode.
// We need to fill the remaining bytes with NOPs.
if (minHookLength > jumpOpcodes.Count)
{
int nopBytes = minHookLength - jumpOpcodes.Count;
for (int x = 0; x < nopBytes; x++)
{
jumpOpcodes.Add(0x90);
}
}
/* Get bytes from original function prologue and patch them. */
CurrentProcess.SafeReadRaw((IntPtr)functionAddress, out byte[] originalFunction, minHookLength);
var functionPatcher = new FunctionPatcher(ArchitectureMode.x86_32);
var functionPatch = functionPatcher.Patch(originalFunction.ToList(), (IntPtr)functionAddress);
IntPtr hookEndAddress = (IntPtr)(functionAddress + minHookLength);
functionPatch.NewFunction.AddRange(Utilities.AssembleAbsoluteJump(hookEndAddress, false));
/* Second wave of patching. */
var icedPatcher = new IcedPatcher(false, functionPatch.NewFunction.ToArray(), (IntPtr)functionAddress);
/* Create Hook instance. */
hook.OriginalFunctionAddress = icedPatcher.GetFunctionAddress();
hook.OriginalFunction = Wrapper.Create <TFunction>((long)icedPatcher.GetFunctionAddress(), out IntPtr originalFunctionWrapperAddress);
hook.OriginalFunctionWrapperAddress = originalFunctionWrapperAddress;
hook.ReverseWrapper = reverseWrapper;
hook._otherHookPatches = functionPatch.Patches;
hook._hookPatch = new Patch((IntPtr)functionAddress, jumpOpcodes.ToArray());
Mutex.MakeHookMutex.ReleaseMutex();
}