cheat-engine/DBKKernel/threads.c

#pragma warning( disable: 4103)

#include "threads.h"
#include "processlist.h"
#include "memscan.h"

struct ThreadData* GetThreaddata(ULONG threadid)
{
	struct ProcessData *tempProcessData;
	struct ThreadData *tempThreadData;

	//PRE: Lock the list before calling this routine
	tempProcessData=processlist;
	while (tempProcessData)
	{
		tempThreadData=tempProcessData->Threads;
		while (tempThreadData)
		{
			if (tempThreadData->ThreadID==(HANDLE)(UINT_PTR)threadid)
				return tempThreadData;
			
			tempThreadData=tempThreadData->next;
		}
        
		tempProcessData=tempProcessData->next;
	}

	return NULL;
}

void Ignore(PKAPC Apc, PKNORMAL_ROUTINE NormalRoutine, PVOID NormalContext, PVOID SystemArgument1, PVOID SystemArgument2)
{
	//ignore
	return;
}

void SuspendThreadAPCRoutine(PVOID arg1, PVOID arg2, PVOID arg3)
{
	LARGE_INTEGER Timeout;
	struct ThreadData *x;
	//DbgPrint("Inside SuspendThreadAPCRoutine\n");
	   
	
	x=arg1;

	//DbgPrint("x=%p",x);
	DbgPrint("Waiting...\n");
	Timeout.QuadPart = -999999999999999;	

		
	KeWaitForSingleObject(&(x->SuspendSemaphore), Suspended, KernelMode, FALSE, NULL);
	//KeDelayExecutionThread(KernelMode, FALSE, &Timeout);
	DbgPrint("Resuming...\n");
}

void DBKSuspendThread(ULONG ThreadID)
{
	KIRQL OldIrql;
	
	struct ThreadData *t_data;


	if (ExAcquireResourceSharedLite(&ProcesslistR, TRUE))
	{
		DbgPrint("Going to suspend this thread\n");

		//find the thread in the threadlist


		//find the threadid in the processlist
		t_data = GetThreaddata(ThreadID);
		if (t_data)
		{
			DbgPrint("Suspending thread....\n");



			if (!t_data->PEThread)
			{
				//not yet initialized
				t_data->PEThread = (PETHREAD)getPEThread(ThreadID);
				KeInitializeApc(&t_data->SuspendApc,
					(PKTHREAD)t_data->PEThread,
					0,
					(PKKERNEL_ROUTINE)Ignore,
					(PKRUNDOWN_ROUTINE)NULL,
					(PKNORMAL_ROUTINE)SuspendThreadAPCRoutine,
					KernelMode,
					t_data);

			}
			DbgPrint("x should be %p", t_data);
			t_data->suspendcount++;

			if (t_data->suspendcount == 1) //not yet suspended so suspend it
				KeInsertQueueApc(&t_data->SuspendApc, t_data, t_data, 0);
		}
		else
			DbgPrint("Thread not found in the list\n");
	}
	ExReleaseResourceLite(&ProcesslistR);
}

void DBKResumeThread(ULONG ThreadID)
{
	KIRQL OldIrql;
	
	struct ThreadData *t_data;


	if (ExAcquireResourceSharedLite(&ProcesslistR, TRUE))
	{

		DbgPrint("Going to resume this thread\n");

		//find the thread in the threadlist


		//find the threadid in the processlist
		t_data = GetThreaddata(ThreadID);
		if (t_data)
		{
			if (t_data->suspendcount)
			{
				t_data->suspendcount--;
				if (!t_data->suspendcount) //suspendcount=0 so resume
					KeReleaseSemaphore(&t_data->SuspendSemaphore, 0, 1, FALSE);
			}
		}
		else
			DbgPrint("Thread not found in the list\n");
	}
	ExReleaseResourceLite(&ProcesslistR);

}

void DBKSuspendProcess(ULONG ProcessID)
{
	KIRQL OldIrql;
	
	struct ThreadData *t_data=NULL;
	struct ProcessData *tempProcessData=NULL;


	if (ExAcquireResourceSharedLite(&ProcesslistR, TRUE))
	{


		DbgPrint("Going to suspend this process\n");

		//find the process in the threadlist

		tempProcessData = processlist;
		while (tempProcessData)
		{
			if (tempProcessData->ProcessID == (HANDLE)(UINT_PTR)ProcessID)
			{
				t_data = tempProcessData->Threads;
				break;
			}
			tempProcessData = tempProcessData->next;
		}

		if (!t_data)
		{
			DbgPrint("This process was not found\n");
			ExReleaseResourceLite(&ProcesslistR);
			return; //no process found
		}


		while (t_data)
		{
			DbgPrint("Suspending thread....\n");

			if (!t_data->PEThread)
			{
				//not yet initialized
				t_data->PEThread = (PETHREAD)getPEThread((UINT_PTR)t_data->ThreadID);
				KeInitializeApc(&t_data->SuspendApc,
					(PKTHREAD)t_data->PEThread,
					0,
					(PKKERNEL_ROUTINE)Ignore,
					(PKRUNDOWN_ROUTINE)NULL,
					(PKNORMAL_ROUTINE)SuspendThreadAPCRoutine,
					KernelMode,
					t_data);

			}
			DbgPrint("x should be %p", t_data);
			t_data->suspendcount++;

			if (t_data->suspendcount == 1) //not yet suspended so suspend it
				KeInsertQueueApc(&t_data->SuspendApc, t_data, t_data, 0);

			t_data = t_data->next; //next thread
		}
	}
	ExReleaseResourceLite(&ProcesslistR);

}

void DBKResumeProcess(ULONG ProcessID)
{
	KIRQL OldIrql;
	
	struct ThreadData *t_data=NULL;
	struct ProcessData *tempProcessData=NULL;


	if (ExAcquireResourceSharedLite(&ProcesslistR, TRUE))
	{

		DbgPrint("Going to suspend this process\n");

		//find the process in the threadlist

		tempProcessData = processlist;
		while (tempProcessData)
		{
			if (tempProcessData->ProcessID == (HANDLE)(UINT_PTR)ProcessID)
			{
				t_data = tempProcessData->Threads;
				break;
			}
			tempProcessData = tempProcessData->next;
		}

		if (!t_data)
		{
			DbgPrint("This process was not found\n");
			ExReleaseResourceLite(&ProcesslistR);
			return; //no process found
		}


		while (t_data)
		{
			DbgPrint("Resuming thread....\n");

			if (t_data->suspendcount)
			{
				t_data->suspendcount--;
				if (!t_data->suspendcount) //suspendcount=0 so resume
					KeReleaseSemaphore(&t_data->SuspendSemaphore, 0, 1, FALSE);
			}


			t_data = t_data->next; //next thread
		}
	}
	ExReleaseResourceLite(&ProcesslistR);
}