#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <windows.h>
#include <winnt.h>
#define MAX_PROGRAM_SIZE 0x10000 // 64KB
#define SECTION_SIZE 512
#define MEMORY_START 0
#define MEMORY_END 1
#define CODE 2
#define DATA 3
#define STACK 4
typedef struct _command
{
const unsigned char *ucpCommand;
void( *fp )();
} COMMAND;
typedef struct _CONTEXT_INFO
{
int efl;
int eip;
int edi;
int esi;
int ebp;
int esp;
int ebx;
int edx;
int ecx;
int eax;
} CONTEXT_INFO;
void ChaseAddress( unsigned char * _uCp, int _iSize );
void DrawHeader();
void STST( CONTEXT_INFO *stpReg ); // CPU의 정보를 메모리에 저장
void LDST( CONTEXT_INFO *stpReg ); // 메모리에 저장된 CPU 정보를 재등록
unsigned char MD( int * ); // Memory Display Function By Assembly
void MM( int *, char); // Memory Modify Function By Assembly
void PrintRegister( CONTEXT_INFO *stpReg );
void ClearMemory();
void Command();
void ViewCode();
void ViewData();
void ViewStack();
void OpenExcutable();
void Exit();
void ViewRegister();
unsigned char ucMemory[MAX_PROGRAM_SIZE * 2];
static unsigned char *ucpPoint[5]; // 메모리 공간을 구분하는 변수. 이곳에서만 쓰이기 때문에 static
COMMAND stCommand[] =
{
{ "CODE", ViewCode },
{ "DATA", ViewData },
{ "STACK", ViewStack },
{ "REGISTER", ViewRegister },
{ "LOAD", OpenExcutable },
{ "CLEAR", ClearMemory },
{ "EXIT", Exit },
{ 0, 0 }
};
int main()
{
int a = 0x12345678;
CONTEXT_INFO stReg = { 0, };
ucpPoint[MEMORY_START] = ucMemory;
ucpPoint[MEMORY_END] = ucMemory + sizeof( ucMemory );
ucpPoint[CODE] = ( unsigned char * )( ( int )( ucMemory+MAX_PROGRAM_SIZE ) & 0xFFFF0000 );
ucpPoint[DATA] = ucpPoint[CODE] + 0x2000;
ucpPoint[STACK] = ucMemory+0x10000;
printf( "Start of memory\t: 0x%08X\n", ucpPoint[MEMORY_START] );
printf( "End of memory\t: 0x%08X\n", ucpPoint[MEMORY_END] );
printf( "CODE\t: 0x%08X\n", ucpPoint[CODE] );
printf( "DATA\t: 0x%08X\n", ucpPoint[DATA] );
printf( "STACK\t: 0x%08X\n", ucpPoint[STACK] );
STST( ( CONTEXT_INFO * )ucpPoint[CODE] );
while( 1 )
{
Command();
}
printf( "0x%08X : %02X\n", &a, MD( &a ) );
MM( &a, 0xFF );
printf( "0x%08X : %02X\n", &a, MD( &a ) );
printf( "0x%08X : %08X\n", &a, a );
ChaseAddress( ( unsigned char * )&a, 4 );
PrintRegister( &stReg );
STST( &stReg );
PrintRegister( &stReg );
LDST( &stReg );
printf( "Kernel Panic\n" );
return 0;
}
void PrintRegister( CONTEXT_INFO *stpReg )
{
printf( "┌──────RegisterStatus──────┐\n" );
printf( "│EAX : 0x%08X\t", stpReg->eax );
printf( "ECX : 0x%08X│\n", stpReg->ecx );
printf( "│EDX : 0x%08X\t", stpReg->edx );
printf( "EBX : 0x%08X│\n", stpReg->ebx );
printf( "│ESP : 0x%08X\t", stpReg->esp );
printf( "EBP : 0x%08X│\n", stpReg->ebp );
printf( "│ESI : 0x%08X\t", stpReg->esi );
printf( "EDI : 0x%08X│\n", stpReg->edi );
printf( "│EIP : 0x%08X\t", stpReg->eip );
printf( "EFL : 0x%08X│\n", stpReg->efl );
printf( "└───────────────────┘\n\n" );
}
void ChaseAddress( unsigned char * _uCp, int _iSize )
{
unsigned char *m_uCp = _uCp;
int m_count=0;
int i=0;
int m_bytes = 0;
printf( "\n" );
DrawHeader();
while( 1 )
{
if( ( i % 22 == 0 )&&( i != 0 ) )
{
printf( "<Press any key to view more... <q> to exit>" );
if( getch() == 'q' )
{
break;
}
putchar( '\n' );
DrawHeader();
}
printf( " %08X ", m_uCp );
for( m_count=0; m_count<=15; m_count++ )
{
if( m_bytes < _iSize )
{
printf( "%02X", MD( ( int * )(m_uCp + m_count) ) );
if( m_count != 15 )
{
putchar(' ');
}
m_bytes = m_bytes + 1;
}
else
{
printf( " " );
if( m_count != 15 )
{
putchar(' ');
}
}
}
printf( " " );
for( m_count=0; m_count<=15; m_count++ )
{
if( m_uCp + m_count < _uCp+_iSize )
{
if( 0 == *( m_uCp + m_count ) )
{
printf( "." );
}
else if( 32 > *( m_uCp + m_count ) )
{
printf( "*" );
}
else if( 127 < *( m_uCp + m_count ) )
{
printf( "*" );
}
else
{
printf( "%c", MD( ( int * )(m_uCp + m_count) ) );
}
}
else
{
printf( " " );
}
}
if( m_bytes == _iSize )
{
printf( "\n\n<End of memory.>\n" );
break;
}
putchar( '\n' );
i = i + 1;
m_uCp = m_uCp + 16;
}
printf( "\n\n" );
}
void DrawHeader()
{
int i;
printf( " Address HEX ASCII\n" );
printf( " " );
for( i=0; i<=15; i++ )
{
printf( "%02X", i );
if( i != 15 )
{ putchar(' ');
}
}
printf( " " );
for( i=0; i<=15; i++ )
{
printf( "%1X", i );
}
printf( "\n" );
}
void Command()
{
int i;
int iRet;
unsigned char ucCommand[30];
printf( "COMMAND> " );
iRet = read( 0, ucCommand, 30 );
ucCommand[iRet-1] = 0;
for( i=0; i<strlen(ucCommand); i++ )
{
ucCommand[i] = toupper( ucCommand[i] );
}
i = 0;
while( 1 )
{
if( stCommand[i].fp == 0 )
{
printf( "오류 : 없는 명령어 입니다!\n\n<명령어 목록>\n" );
for( i=0; stCommand[i].fp!=0; i++ )
{
printf( "%s\n", stCommand[i].ucpCommand );
}
putchar( '\n' );
break;
}
if( strcmp( stCommand[i].ucpCommand, ucCommand ) == 0 )
{
(stCommand[i].fp)();
break;
}
i++;
}
}
void ViewCode()
{
ChaseAddress( ucpPoint[CODE], ucpPoint[DATA]-ucpPoint[CODE] );
return;
}
void ViewData()
{
ChaseAddress( ucpPoint[DATA], ucpPoint[DATA]-ucpPoint[CODE] );
return;
}
void ViewStack()
{
ChaseAddress( ucpPoint[STACK], ucpPoint[MEMORY_END]-ucpPoint[STACK] );
return;
}
void ViewRegister()
{
CONTEXT_INFO stCONTEXT_INFO;
STST( &stCONTEXT_INFO );
PrintRegister( &stCONTEXT_INFO );
return;
}
void Exit()
{
exit( 0 );
return;
}
void OpenExcutable()
{
int iFd = 0; // File descripter
int iRet;
unsigned int uiTotalCount = 0;
unsigned int iCount = 0;
unsigned char *ucpCursor;
unsigned char *ucpCodeStart;
unsigned char ucFileName[30];
IMAGE_DOS_HEADER *stpDOSHeader;
IMAGE_NT_HEADERS *stpNTHeader;
printf( "파일 이름<실행파일> : " );
iRet = read( 0, ucFileName, 30 );
ucFileName[iRet-1] = 0;
iFd = open( ucFileName, O_RDONLY );
if( iFd < 0 )
{
printf( "\n파일을 열 수 없습니다...\n\n" );
return;
}
ClearMemory();
iRet = read( iFd, ucMemory, MAX_PROGRAM_SIZE );
if( iRet < 0 )
{
printf( "\n파일을 읽을 수 없습니다...\n\n" );
close( iFd );
return;
}
stpDOSHeader = ( IMAGE_DOS_HEADER* )ucMemory;
printf( "파일을 열었습니다.\n" );
if( stpDOSHeader->e_magic != 0x5A4D )
{
printf( "올바른 파일 형식이 아닙니다. 실행 파일을 입력해 주시기 바랍니다.\n\n" );
close( iFd );
return;
}
stpNTHeader = ( IMAGE_NT_HEADERS* )( ucMemory + stpDOSHeader->e_lfanew -1 );
uiTotalCount = stpNTHeader->OptionalHeader.SizeOfHeaders;
iRet = lseek( iFd, stpNTHeader->OptionalHeader.SizeOfHeaders, SEEK_SET );
ClearMemory();
if( iRet < 0 )
{
printf( "파일 적재 오류!\n" );
close( iFd );
return;
}
iRet = read( iFd, ucpPoint[CODE], SECTION_SIZE );
if( iRet < 0 )
{
printf( "코드 영역 적재 오류!\n" );
close( iFd );
return;
}
uiTotalCount = uiTotalCount + iRet;
iRet = read( iFd, ucpPoint[DATA], SECTION_SIZE );
if( iRet < 0 )
{
printf( "데이터 영역 적재 오류!\n" );
close( iFd );
return;
}
uiTotalCount = uiTotalCount + iRet;
printf( "총 읽어들인 바이트 수 : %d bytes\n", uiTotalCount );
close( iFd );
return;
}
void ClearMemory()
{
printf( "메모리를 초기화합니다...\n" );
memset( ucpPoint[CODE], 0, ucpPoint[MEMORY_END]-ucpPoint[CODE] );
} |
