exceptanti.cpp

来自「此为本书的配套光盘.本书不但由浅入深地讲解了软件保护技术」· C++ 代码 · 共 176 行

/********************************************************************

	Copyright (c) Beijing Feitian Technologies
	http://www.FTSafe.com

	File :		ExceptAnti.cpp	

	Created:	2003/11/05

	Author:		yihai
	
	Purpose:	?

	Revision:	?

*********************************************************************/
// ExceptAnti.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <Windows.h>

void Branch2_Func1();
void Branch2_Func2();
void Branch2_Func3();

void Branch1_Func1();
void Branch1_Func2();
void Branch1_Func3();

void FuncEntry();

#pragma optimize( "", off ) 	
void Throw_Div0()
{
	printf("(Throw_Div0)\n");
	int i=0;	
	i /=i;
}
#pragma optimize( "", on ) 

void Throw_ErrIns()
{	 
	printf("(Throw_ErrIns)\n");
	__asm  _emit 0x8d
	__asm  _emit 0xc0
}

void Throw_Addr0()
{
	printf("(Throw_Addr0)\n");
	char* p = (char*)NULL;
	*p = (char)GetTickCount();
}

void Throw_Addr0_asm()
{
	printf("(Throw_Addr0_asm)\n");
	__asm  xor eax,eax
	__asm  mov eax,[eax]
}

void Branch1_Func1()
{
	printf("Branch1_Func1\n");
	__try
	{
		Branch1_Func2();
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		printf("catch exception Branch1_Func1\n");
		Throw_Div0();
	}	
}

void Branch1_Func2()
{
	printf("\tBranch1_Func2\n");
	__try
	{
		Branch1_Func3();		
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		printf("\tcatch exception Branch1_Func2\n");
		Throw_Addr0();
	}
}

void Branch1_Func3()
{
	printf("\t\tBranch1_Func3\n");
	__try
	{
		Throw_ErrIns();
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		printf("\t\tcatch exception Branch1_Func3\n");
		Throw_Addr0_asm();
	}
}


void Branch2_Func1()
{
	printf("Branch2_Func1\n");
	__try
	{
		Branch2_Func2();
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		printf("catch exception Branch2_Func1\n");
		Throw_Div0();
	}	
}

void Branch2_Func2()
{
	printf("\tBranch2_Func2\n");
	__try
	{
		Branch2_Func3();		
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		printf("\tcatch exception Branch2_Func2\n");
		Throw_Addr0();
	}
}

void Branch2_Func3()
{
	printf("\t\tBranch2_Func3\n");
	__try
	{
		Throw_ErrIns();
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		printf("\t\tcatch exception Branch2_Func3\n");
		printf("\t\tcall FuncEntry now\n");
		FuncEntry();
	}
}

void FuncEntry()
{
	MessageBox(NULL,"Function is Normal",NULL,MB_OK);
}

int main(int argc, char* argv[])
{
	__try
	{
		Branch1_Func1();
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		Branch2_Func1();
	}
	
	return 0;
}

int APIENTRY WinMain(
					 IN HINSTANCE hInstance,
					 IN HINSTANCE hPrevInstance,
					 IN LPSTR lpCmdLine,
					 IN int nShowCmd
					 )
{
	return main(0,0);
}