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inlinehook.cpp
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inlinehook.cpp
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#include <windows.h>
#ifdef WIN32
#define RING3
#endif
#ifdef RING3
#include <windows.h>
#else
#include <windef.h>
#endif
#include "inlinehook.h"
#ifdef RING3
#define __malloc(_s) VirtualAlloc(NULL, _s, MEM_COMMIT, PAGE_EXECUTE_READWRITE)
#define __free(_p) VirtualFree(_p, 0, MEM_RELEASE)
#define JMP_SIZE 5
#else
#define __malloc(_s) ExAllocatePool(NonPagedPool, _s)
#define __free(_p) ExFreePool(_p)
#define JMP_SIZE 7
#endif
#ifdef RING3
BOOL
WriteReadOnlyMemory(
LPBYTE lpDest,
LPBYTE lpSource,
ULONG Length
)
{
BOOL bRet;
DWORD dwOldProtect;
bRet = FALSE;
if (!VirtualProtect(lpDest, Length, PAGE_EXECUTE_READWRITE, &dwOldProtect))
{
return bRet;
}
memcpy(lpDest, lpSource, Length);
bRet = VirtualProtect(lpDest, Length, dwOldProtect, &dwOldProtect);
return bRet;
}
#else
NTSTATUS
WriteReadOnlyMemory(
LPBYTE lpDest,
LPBYTE lpSource,
ULONG Length
)
{
NTSTATUS status;
KSPIN_LOCK spinLock;
KIRQL oldIrql;
PMDL pMdlMemory;
LPBYTE lpWritableAddress;
status = STATUS_UNSUCCESSFUL;
pMdlMemory = IoAllocateMdl(lpDest, Length, FALSE, FALSE, NULL);
if (NULL == pMdlMemory)
return status;
MmBuildMdlForNonPagedPool(pMdlMemory);
MmProbeAndLockPages(pMdlMemory, KernelMode, IoWriteAccess);
lpWritableAddress = MmMapLockedPages(pMdlMemory, KernelMode);
if (NULL != lpWritableAddress)
{
oldIrql = 0;
KeInitializeSpinLock(&spinLock);
KeAcquireSpinLock(&spinLock, &oldIrql);
memcpy(lpWritableAddress, lpSource, Length);
KeReleaseSpinLock(&spinLock, oldIrql);
MmUnmapLockedPages(lpWritableAddress, pMdlMemory);
status = STATUS_SUCCESS;
}
MmUnlockPages(pMdlMemory);
IoFreeMdl(pMdlMemory);
return status;
}
#endif
BOOL
GetPatchSize2(
IN void *Proc, /* 需要Hook的函数地址 */
IN DWORD dwNeedSize, /* Hook函数头部占用的字节大小 */
OUT LPDWORD lpPatchSize /* 返回根据函数头分析需要修补的大小 */
)
{
DWORD Length;
PUCHAR pOpcode;
DWORD PatchSize = 0;
if (!Proc || !lpPatchSize)
{
return FALSE;
}
do
{
Length = SizeOfCode(Proc, &pOpcode);
if ((Length == 1) && (*pOpcode == 0xC3))
break;
if ((Length == 3) && (*pOpcode == 0xC2))
break;
Proc = (PVOID)((DWORD)Proc + Length);
PatchSize += Length;
if (PatchSize >= dwNeedSize)
{
break;
}
}while(Length);
*lpPatchSize = PatchSize;
return TRUE;
}
BOOL
InlineHook(
IN void *OrgProc, /* 需要Hook的函数地址 */
IN void *NewProc, /* 代替被Hook函数的地址 */
OUT void **RealProc /* 返回原始函数的入口地址 */
)
{
DWORD dwPatchSize; // 得到需要patch的字节大小
//DWORD dwOldProtect;
LPVOID lpHookFunc; // 分配的Hook函数的内存
DWORD dwBytesNeed; // 分配的Hook函数的大小
LPBYTE lpPatchBuffer; // jmp 指令的临时缓冲区
if (!OrgProc || !NewProc || !RealProc)
{
return FALSE;
}
// 得到需要patch的字节大小
if (!GetPatchSize2(OrgProc, JMP_SIZE, &dwPatchSize))
{
return FALSE;
}
/*
0x00000800 0x00000800 sizeof(DWORD) // dwPatchSize
JMP / FAR 0xAABBCCDD E9 DDCCBBAA JMP_SIZE
... ... dwPatchSize // Backup instruction
JMP / FAR 0xAABBCCDD E9 DDCCBBAA JMP_SIZE
*/
dwBytesNeed = sizeof(DWORD) + JMP_SIZE + dwPatchSize + JMP_SIZE;
lpHookFunc = __malloc(dwBytesNeed);
//备份dwPatchSize到lpHookFunc
*(DWORD *)lpHookFunc = dwPatchSize;
//跳过开头的4个字节
lpHookFunc = (LPVOID)((DWORD)lpHookFunc + sizeof(DWORD));
//开始backup函数开头的字
memcpy((BYTE *)lpHookFunc + JMP_SIZE, OrgProc, dwPatchSize);
lpPatchBuffer = (LPBYTE)__malloc(dwPatchSize);
//NOP填充
memset(lpPatchBuffer, 0x90, dwPatchSize);
#ifdef RING3
//jmp到Hook
*(BYTE *)lpHookFunc = 0xE9;
*(DWORD*)((DWORD)lpHookFunc + 1) = (DWORD)NewProc - (DWORD)lpHookFunc - JMP_SIZE;
//跳回原始
*(BYTE *)((DWORD)lpHookFunc + 5 + dwPatchSize) = 0xE9;
*(DWORD*)((DWORD)lpHookFunc + 5 + dwPatchSize + 1) = ((DWORD)OrgProc + dwPatchSize) - ((DWORD)lpHookFunc + JMP_SIZE + dwPatchSize) - JMP_SIZE;
//jmp
*(BYTE *)lpPatchBuffer = 0xE9;
//注意计算长度的时候得用OrgProc
*(DWORD*)(lpPatchBuffer + 1) = (DWORD)lpHookFunc - (DWORD)OrgProc - JMP_SIZE;
#else
//jmp到Hook
*(BYTE *)lpHookFunc = 0xEA;
*(DWORD*)((DWORD)lpHookFunc + 1) = (DWORD)NewProc;
*(WORD*)((DWORD)lpHookFunc + 5) = 0x08;
//跳回原始
*(BYTE *)((DWORD)lpHookFunc + JMP_SIZE + dwPatchSize) = 0xEA;
*(DWORD*)((DWORD)lpHookFunc + JMP_SIZE + dwPatchSize + 1) = ((DWORD)OrgProc + dwPatchSize);
*(WORD*)((DWORD)lpHookFunc + JMP_SIZE + dwPatchSize + 5) = 0x08;
//jmp far
*(BYTE *)lpPatchBuffer = 0xEA;
//跳到lpHookFunc函数
*(DWORD*)(lpPatchBuffer + 1) = (DWORD)lpHookFunc;
*(WORD*)(lpPatchBuffer + 5) = 0x08;
#endif
WriteReadOnlyMemory((LPBYTE)OrgProc, lpPatchBuffer, dwPatchSize);
__free(lpPatchBuffer);
*RealProc = (void *)((DWORD)lpHookFunc + JMP_SIZE);
return TRUE;
}
void UnInlineHook(
void *OrgProc, /* 需要恢复Hook的函数地址 */
void *RealProc /* 原始函数的入口地址 */
)
{
DWORD dwPatchSize;
//DWORD dwOldProtect;
LPBYTE lpBuffer;
//找到分配的空间
lpBuffer = (LPBYTE)((DWORD)RealProc - (sizeof(DWORD) + JMP_SIZE));
//得到dwPatchSize
dwPatchSize = *(DWORD *)lpBuffer;
WriteReadOnlyMemory((LPBYTE)OrgProc, (LPBYTE)RealProc, dwPatchSize);
//释放分配的跳转函数的空间
__free(lpBuffer);
return;
}