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Textractor/vnrhook/src/hijack/texthook.cc
Akash Mozumdar 11d75c2987 notify hook removal via pipe - fix hook rewrite bug
2018-08-02 17:16:49 -04:00

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// texthook.cc
// 8/24/2013 jichi
// Branch: ITH_DLL/texthook.cpp, rev 128
// 8/24/2013 TODO: Clean up this file
#ifdef _MSC_VER
# pragma warning (disable:4100) // C4100: unreference formal parameter
# pragma warning (disable:4018) // C4018: sign/unsigned mismatch
//# pragma warning (disable:4733) // C4733: Inline asm assigning to 'FS:0' : handler not registered as safe handler
#endif // _MSC_VER
#include "src/hijack/texthook.h"
#include "src/engine/match.h"
#include "src/except.h"
#include "src/main.h"
#include "include/const.h"
#include "ithsys/ithsys.h"
#include "disasm/disasm.h"
//#include "winseh/winseh.h"
//#define ConsoleOutput(...) (void)0 // jichi 9/17/2013: I don't need this ><
// - Global variables -
// 10/14/2014 jichi: disable GDI hooks
static bool gdi_hook_enabled_ = true; // enable GDI by default
static bool gdiplus_hook_enabled_ = false; // disable GDIPlus by default
bool GDIHooksEnabled() { return ::gdi_hook_enabled_; }
bool GDIPlusHooksEnabled() { return ::gdiplus_hook_enabled_; }
void EnableGDIHooks() { ::gdi_hook_enabled_ = true; }
void EnableGDIPlusHooks() { ::gdiplus_hook_enabled_ = true; }
void DisableGDIHooks() { ::gdi_hook_enabled_ = false; }
void DisableGDIPlusHooks() { ::gdiplus_hook_enabled_ = false; }
static bool IsGDIFunction(LPCVOID addr)
{
static LPVOID funcs[] = { HOOK_GDI_FUNCTION_LIST };
for (size_t i = 0; i < sizeof(funcs)/sizeof(*funcs); i++)
if (addr == funcs[i])
return true;
return false;
}
//FilterRange filter[8];
DWORD flag,
enter_count;
TextHook *hookman,
*current_available;
// - Unnamed helpers -
namespace { // unnamed
//provide const time hook entry.
int userhook_count;
#if 0 // 3/6/2015 jichi: this hook is not used and hence disabled
const byte common_hook2[] = {
0x89, 0x3c,0xe4, // mov [esp],edi
0x60, // pushad
0x9c, // pushfd
0x8d,0x54,0x24,0x28, // lea edx,[esp+0x28] ; esp value
0x8b,0x32, // mov esi,[edx] ; return address
0xb9, 0,0,0,0, // mov ecx, $ ; pointer to TextHook
0xe8, 0,0,0,0, // call @hook
0x9d, // popfd
0x61, // popad
0x5f, // pop edi ; skip return address on stack
}; //...
#endif // 0
const BYTE common_hook[] = {
0x9c, // pushfd
0x60, // pushad
0x9c, // pushfd
0x8d,0x54,0x24,0x28, // lea edx,[esp+0x28] ; esp value
0x8b,0x32, // mov esi,[edx] ; return address
0xb9, 0,0,0,0, // mov ecx, $ ; pointer to TextHook
0xe8, 0,0,0,0, // call @hook
0x9d, // popfd
0x61, // popad
0x9d // popfd
};
/**
* jichi 7/19/2014
*
* @param original_addr
* @param new_addr
* @param hook_len
* @param original_len
* @return -1 if failed, else 0 if ?, else ?
*/
int MapInstruction(DWORD original_addr, DWORD new_addr, BYTE &hook_len, BYTE &original_len)
{
int flag = 0;
DWORD l = 0;
const BYTE *r = (const BYTE *)original_addr; // 7/19/2014 jichi: original address is not modified
BYTE *c = (BYTE *)new_addr; // 7/19/2014 jichi: but new address might be modified
while((r - (BYTE *) original_addr) < 5) {
l = ::disasm(r);
if (l == 0) {
ConsoleOutput("vnrcli:MapInstruction: FAILED: failed to disasm");
return -1;
}
::memcpy(c, r, l);
if (*r >= 0x70 && *r < 0x80) {
c[0] = 0xf;
c[1] = *r + 0x10;
c += 6;
__asm
{
mov eax,r
add eax,2
movsx edx,byte ptr [eax-1]
add edx,eax
mov eax,c
sub edx,eax
mov [eax-4],edx
}
} else if (*r == 0xeb) {
c[0] = 0xe9;
c += 5;
__asm
{
mov eax,r
add eax,2
movsx edx,[eax-1]
add edx,eax
mov eax,c
sub edx,eax
mov [eax-4],edx
}
if (r - (BYTE *)original_addr < 5 - l) {
ConsoleOutput("vnrcli:MapInstruction: not safe to move instruction right after short jmp");
return -1; // Not safe to move instruction right after short jmp.
} else
flag = 1;
} else if (*r == 0xe8 || *r == 0xe9) {
c[0]=*r;
c += 5;
flag = (*r == 0xe9);
__asm
{
mov eax,r
add eax,5
mov edx,[eax-4]
add edx,eax
mov eax,c
sub edx,eax
mov [eax-4],edx
}
} else if (*r == 0xf && (*(r + 1) >> 4) == 0x8) {
c += 6;
__asm
{
mov eax,r
mov edx,dword ptr [eax+2]
add eax,6
add eax,edx
mov edx,c
sub eax,edx
mov [edx-4],eax
}
}
else
c += l;
r += l;
}
original_len = r - (BYTE *)original_addr;
hook_len = c - (BYTE *)new_addr;
return flag;
}
//copy original instruction
//jmp back
DWORD GetModuleBase(DWORD hash)
{
__asm
{
mov eax,fs:[0x30]
mov eax,[eax+0xc]
mov esi,[eax+0x14]
mov edi,_wcslwr
listfind:
mov edx,[esi+0x28]
test edx,edx
jz notfound
push edx
call edi
pop edx
xor eax,eax
calc:
movzx ecx, word ptr [edx]
test cl,cl
jz fin
ror eax,7
add eax,ecx
add edx,2
jmp calc
fin:
cmp eax,[hash]
je found
mov esi,[esi]
jmp listfind
notfound:
xor eax,eax
jmp termin
found:
mov eax,[esi+0x10]
termin:
}
}
DWORD GetModuleBase()
{
__asm
{
mov eax, fs:[0x18]
mov eax, [eax + 0x30]
mov eax, [eax + 0xc]
mov eax, [eax + 0xc]
mov eax, [eax + 0x18]
}
}
//void NotifyHookInsert()
//{
// if (live)
// {
// BYTE buffer[0x10];
// *(DWORD*)buffer=-1;
// *(DWORD*)(buffer+4)=1;
// IO_STATUS_BLOCK ios;
// NtWriteFile(hookPipe,0,0,0,&ios,buffer,0x10,0,0);
// }
//}
__declspec(naked) void SafeExit() // Return to eax
{
__asm
{
mov [esp+0x24], eax
popfd
popad
retn
}
}
#if 0
// jichi 12/2/2013: This function mostly return 0.
// But sometimes return the hook address from TextHook::Send
__declspec(naked) // jichi 10/2/2013: No prolog and epilog
int ProcessHook(DWORD dwDataBase, DWORD dwRetn, TextHook *hook) // Use SEH to ensure normal execution even bad hook inserted.
{
//with_seh(hook->Send(dwDataBase, dwRetn));
seh_push_(seh_exit, 0, eax, ebx) // jichi 12/13/2013: only eax and ebx are available. ecx and edx are used.
__asm
{
push esi
push edx
call TextHook::UnsafeSend
test eax, eax
jz seh_exit // label in seh_pop
mov ecx, SafeExit
mov [esp + 8], ecx // jichi 12/13/2013: change exit point if Send returns non-zero, not + 8 beause two elements has been pused
}
seh_pop_(seh_exit)
__asm retn // jichi 12/13/2013: return near, see: http://stackoverflow.com/questions/1396909/ret-retn-retf-how-to-use-them
}
#endif // 0
#if 1
__declspec(naked) // jichi 10/2/2013: No prolog and epilog
int ProcessHook(DWORD dwDataBase, DWORD dwRetn, TextHook *hook) // Use SEH to ensure normal execution even bad hook inserted.
{
// jichi 12/17/2013: The function parameters here are meaning leass. The parameters are in esi and edi
__asm
{
push esi
push edx
call TextHook::Send
test eax, eax
jz ok // label in seh_pop
mov ecx, SafeExit
mov [esp], ecx // jichi 12/13/2013: change exit point if Send returns non-zero
ok:
retn // jichi 12/13/2013: return near, see: http://stackoverflow.com/questions/1396909/ret-retn-retf-how-to-use-them
}
}
#endif // 1
// Return false if all text are ascii
bool NoAsciiFilter(LPVOID data, DWORD *size, HookParam *, BYTE)
{
auto text = reinterpret_cast<LPBYTE>(data);
if (text)
for (size_t i = 0; i < *size; i++)
if (text[i] > 127)
return true;
return false;
}
} // unnamed namespace
// - TextHook methods -
// jichi 12/2/2013: This function mostly return 0.
// It return the hook address only for auxiliary case.
// However, because no known hooks are auxiliary, this function always return 0.
//
// jichi 5/11/2014:
// - dwDataBase: the stack address
// - dwRetn: the return address of the hook
DWORD TextHook::Send(DWORD dwDataBase, DWORD dwRetn)
{
// jich: 6/17/2015: do not send when ctrl/shift are controlled
//if (WinKey::isKeyControlPressed() || WinKey::isKeyShiftPressed() && !WinKey::isKeyReturnPressed())
// return 0;
DWORD ret = 0;
//char b[0x100];
//::wcstombs(b, hook_name, 0x100);
//ConsoleOutput(b);
ITH_WITH_SEH(ret = UnsafeSend(dwDataBase, dwRetn));
return ret;
}
DWORD TextHook::UnsafeSend(DWORD dwDataBase, DWORD dwRetn)
{
enum { SMALL_BUFF_SIZE = 0x80 };
enum { MAX_DATA_SIZE = 0x10000 }; // jichi 12/25/2013: The same as the original ITH
DWORD dwCount,
dwAddr,
dwDataIn,
dwSplit;
BYTE *pbData,
pbSmallBuff[SMALL_BUFF_SIZE];
DWORD dwType = hp.type;
//if ((dwType & NO_CONTEXT) == 0 && HookFilter(dwRetn))
// return 0;
if ((dwType & NO_ASCII) && !hp.filter_fun)
hp.filter_fun = NoAsciiFilter;
// jichi 10/24/2014: Skip GDI functions
// Artikash 6/3/2018: ^ why??
// Artikash 6/3/2018: Reenable GDI functions
//if (!::gdi_hook_enabled_ && ::IsGDIFunction((LPCVOID)hp.address))
// return 0;
dwAddr = hp.address;
/** jichi 12/24/2014
* @param addr function address
* @param frame real address of the function, supposed to be the same as addr
* @param stack address of current stack - 4
* @return If success, which is reverted
*/
if (::trigger)
::trigger = Engine::InsertDynamicHook((LPVOID)dwAddr, *(DWORD *)(dwDataBase - 0x1c), *(DWORD *)(dwDataBase-0x18));
// jichi 10/21/2014: Directly invoke engine functions.
//if (trigger) {
// if (InsertDynamicHook)
// trigger = InsertDynamicHook((LPVOID)dwAddr, *(DWORD *)(dwDataBase - 0x1c), *(DWORD *)(dwDataBase-0x18));
// else
// trigger = 0;
//}
#if 0 // diasble HOOK_AUXILIARY
// jichi 12/13/2013: None of known hooks are auxiliary
if (dwType & HOOK_AUXILIARY) {
//Clean hook when dynamic hook finished.
//AUX hook is only used for a foothold of dynamic hook.
if (!trigger) {
ClearHook();
// jichi 12/13/2013: This is the only place where this function could return non-zero value
// However, I non of the known hooks are auxiliary
return dwAddr;
}
return 0;
}
#endif // 0
// jichi 10/24/2014: generic hook function
if (hp.hook_fun && !hp.hook_fun(dwDataBase, &hp))
hp.hook_fun = nullptr;
if (dwType & HOOK_EMPTY) // jichi 10/24/2014: dummy hook only for dynamic hook
return 0;
// jichi 2/2/2015: Send multiple texts
for (BYTE textIndex = 0; textIndex <= hp.extra_text_count; textIndex++) {
dwCount = 0;
dwSplit = 0;
dwDataIn = *(DWORD *)(dwDataBase + hp.offset); // default value
//if (dwType & EXTERN_HOOK) {
if (hp.text_fun) { // jichi 10/24/2014: remove EXTERN_HOOK
//DataFun fun=(DataFun)hp.text_fun;
//auto fun = hp.text_fun;
hp.text_fun(dwDataBase, &hp, textIndex, &dwDataIn, &dwSplit, &dwCount);
//if (dwCount == 0 || dwCount > MAX_DATA_SIZE)
// return 0;
if (dwSplit && (dwType & RELATIVE_SPLIT) && dwSplit > ::processStartAddress)
dwSplit -= ::processStartAddress;
} else {
if (dwDataIn == 0)
return 0;
if (dwType & FIXING_SPLIT)
dwSplit = FIXED_SPLIT_VALUE; // fuse all threads, and prevent floating
else if (dwType & USING_SPLIT) {
dwSplit = *(DWORD *)(dwDataBase + hp.split);
if (dwType & SPLIT_INDIRECT) {
if (IthGetMemoryRange((LPVOID)(dwSplit + hp.split_index), 0, 0))
dwSplit = *(DWORD *)(dwSplit + hp.split_index);
else
return 0;
}
if (dwSplit && (dwType & RELATIVE_SPLIT) && dwSplit > ::processStartAddress)
dwSplit -= ::processStartAddress;
}
if (dwType & DATA_INDIRECT) {
if (IthGetMemoryRange((LPVOID)(dwDataIn + hp.index), 0, 0))
dwDataIn = *(DWORD *)(dwDataIn + hp.index);
else
return 0;
}
//if (dwType & PRINT_DWORD) {
// swprintf((WCHAR *)(pbSmallBuff + HEADER_SIZE), L"%.8X ", dwDataIn);
// dwDataIn = (DWORD)pbSmallBuff + HEADER_SIZE;
//}
dwCount = GetLength(dwDataBase, dwDataIn);
}
// jichi 12/25/2013: validate data size
if (dwCount == 0 || dwCount > MAX_DATA_SIZE)
return 0;
size_t sz = dwCount + HEADER_SIZE;
if (sz >= SMALL_BUFF_SIZE)
pbData = new BYTE[sz];
//ITH_MEMSET_HEAP(pbData, 0, sz * sizeof(BYTE)); // jichi 9/26/2013: zero memory
else
pbData = pbSmallBuff;
if (hp.length_offset == 1) {
if (dwType & STRING_LAST_CHAR) {
LPWSTR ts = (LPWSTR)dwDataIn;
dwDataIn = ts[::wcslen(ts) -1];
}
dwDataIn &= 0xffff;
if ((dwType & BIG_ENDIAN) && (dwDataIn >> 8))
dwDataIn = _byteswap_ushort(dwDataIn & 0xffff);
if (dwCount == 1)
dwDataIn &= 0xff;
*(WORD *)(pbData + HEADER_SIZE) = dwDataIn & 0xffff;
}
else
::memcpy(pbData + HEADER_SIZE, (void *)dwDataIn, dwCount);
// jichi 10/14/2014: Add filter function
if (hp.filter_fun && !hp.filter_fun(pbData + HEADER_SIZE, &dwCount, &hp, textIndex) || dwCount <= 0) {
if (pbData != pbSmallBuff)
delete[] pbData;
return 0;
}
*(DWORD *)pbData = dwAddr;
if (dwType & (NO_CONTEXT|FIXING_SPLIT))
dwRetn = 0;
else if (dwRetn && (dwType & RELATIVE_SPLIT))
dwRetn -= ::processStartAddress;
*((DWORD *)pbData + 1) = dwRetn;
*((DWORD *)pbData + 2) = dwSplit;
if (dwCount) {
DWORD unused;
//CliLockPipe();
WriteFile(::hookPipe, pbData, dwCount + HEADER_SIZE, &unused, nullptr);
//CliUnlockPipe();
}
if (pbData != pbSmallBuff)
delete[] pbData;
}
return 0;
}
int TextHook::InsertHook()
{
//ConsoleOutput("vnrcli:InsertHook: enter");
WaitForSingleObject(hmMutex, 0);
int ok = InsertHookCode();
ReleaseMutex(hmMutex);
//ConsoleOutput("vnrcli:InsertHook: leave");
return ok;
}
int TextHook::InsertHookCode()
{
enum : int { yes = 0, no = 1 };
DWORD ret = no;
// jichi 9/17/2013: might raise 0xC0000005 AccessViolationException on win7
ITH_WITH_SEH(ret = UnsafeInsertHookCode());
//if (ret == no)
// ITH_WARN(L"Failed to insert hook");
return ret;
}
int TextHook::UnsafeInsertHookCode()
{
//ConsoleOutput("vnrcli:UnsafeInsertHookCode: enter");
enum : int { yes = 0, no = 1 };
// MODULE_OFFSET is set, but there's no module address
// this means that this is an absolute address found on Windows 2000/XP
// we make the address relative to the process base
// we also store the original address in the function field because normally there can not
// exist a function address without a module address
if (hp.type & MODULE_OFFSET && !hp.module) {
DWORD base = GetModuleBase();
hp.function = hp.address;
hp.address -= 0x400000;
hp.address += base;
hp.type &= ~MODULE_OFFSET;
}
else if (hp.module && (hp.type & MODULE_OFFSET)) { // Map hook offset to real address.
if (DWORD base = GetModuleBase(hp.module)) {
if (hp.function && (hp.type & FUNCTION_OFFSET)) {
base = GetExportAddress(base, hp.function);
if (base)
hp.address += base;
else {
currentHook--;
ConsoleOutput("vnrcli:UnsafeInsertHookCode: FAILED: function not found in the export table");
return no;
}
}
else {
hp.address += base;
}
hp.type &= ~(MODULE_OFFSET | FUNCTION_OFFSET);
}
else {
currentHook--;
ConsoleOutput("vnrcli:UnsafeInsertHookCode: FAILED: module not present");
return no;
}
}
{
TextHook *it = hookman;
for (int i = 0; (i < currentHook) && it; it++) { // Check if there is a collision.
if (it->Address())
i++;
//it = hookman + i;
if (it == this)
continue;
if (it->Address() <= hp.address &&
it->Address() + it->Length() > hp.address) {
it->ClearHook();
break;
}
}
}
// Verify hp.address.
MEMORY_BASIC_INFORMATION info = {};
NtQueryVirtualMemory(GetCurrentProcess(), (LPVOID)hp.address, MemoryBasicInformation, &info, sizeof(info), nullptr);
if (info.Type & PAGE_NOACCESS) {
ConsoleOutput("vnrcli:UnsafeInsertHookCode: FAILED: page no access");
return no;
}
// Initialize common routine.
memcpy(recover, common_hook, sizeof(common_hook));
BYTE *c = (BYTE *)hp.address,
*r = recover;
BYTE inst[8]; // jichi 9/27/2013: Why 8? Only 5 bytes will be written using NtWriteVirtualMemory
inst[0] = 0xe9; // jichi 9/27/2013: 0xe9 is jump, see: http://code.google.com/p/sexyhook/wiki/SEXYHOOK_Hackers_Manual
__asm
{
mov edx,r // r = recover
mov eax,this
mov [edx+0xa],eax // push TextHook*, resolve to correspond hook.
lea eax,[edx+0x13]
mov edx,ProcessHook
sub edx,eax
mov [eax-4],edx // call ProcessHook
mov eax,c
add eax,5
mov edx,r
sub edx,eax
lea eax,inst+1
mov [eax],edx // jichi 12/17/2013: the parameter of jmp is in edx. So, ProcessHook must be naked.
}
r += sizeof(common_hook);
hp.hook_len = 5;
//bool jmpflag=false; // jichi 9/28/2013: nto used
// Copy original code.
switch (MapInstruction(hp.address, (DWORD)r, hp.hook_len, hp.recover_len)) {
case -1:
ConsoleOutput("vnrcli:UnsafeInsertHookCode: FAILED: failed to map instruction");
return no;
case 0:
__asm
{
mov ecx,this
movzx eax,[ecx]hp.hook_len
movzx edx,[ecx]hp.recover_len
add edx,[ecx]hp.address
add eax,r
add eax,5
sub edx,eax
mov [eax-5],0xe9 // jichi 9/27/2013: 0xe9 is jump
mov [eax-4],edx
}
}
// jichi 9/27/2013: Save the original instructions in the memory
memcpy(original, (LPVOID)hp.address, hp.recover_len);
//Check if the new hook range conflict with existing ones. Clear older if conflict.
{
TextHook *it = hookman;
for (int i = 0; i < currentHook; it++) {
if (it->Address())
i++;
if (it == this)
continue;
if (it->Address() >= hp.address &&
it->Address() < hp.hook_len + hp.address) {
it->ClearHook();
break;
}
}
}
// Insert hook and flush instruction cache.
enum {c8 = 0xcccccccc};
DWORD int3[] = {c8, c8};
DWORD t = 0x100,
old,
len;
// jichi 9/27/2013: Overwrite the memory with inst
// See: http://undocumented.ntinternals.net/UserMode/Undocumented%20Functions/Memory%20Management/Virtual%20Memory/NtProtectVirtualMemory.html
// See: http://doxygen.reactos.org/d8/d6b/ndk_2mmfuncs_8h_af942709e0c57981d84586e74621912cd.html
DWORD addr = hp.address;
NtProtectVirtualMemory(GetCurrentProcess(), (PVOID *)&addr, &t, PAGE_EXECUTE_READWRITE, &old);
NtWriteVirtualMemory(GetCurrentProcess(), (BYTE *)hp.address, inst, 5, &t);
len = hp.recover_len - 5;
if (len)
NtWriteVirtualMemory(GetCurrentProcess(), (BYTE *)hp.address + 5, int3, len, &t);
NtFlushInstructionCache(GetCurrentProcess(), (LPVOID)hp.address, hp.recover_len);
NtFlushInstructionCache(GetCurrentProcess(), (LPVOID)::hookman, 0x1000);
//ConsoleOutput("vnrcli:UnsafeInsertHookCode: leave: succeed");
return 0;
}
int TextHook::InitHook(LPVOID addr, DWORD data, DWORD data_ind,
DWORD split_off, DWORD split_ind, WORD type, DWORD len_off)
{
WaitForSingleObject(hmMutex, 0);
hp.address = (DWORD)addr;
hp.offset = data;
hp.index = data_ind;
hp.split = split_off;
hp.split_index = split_ind;
hp.type = type;
hp.hook_len = 0;
hp.module = 0;
hp.length_offset = len_off & 0xffff;
currentHook++;
if (current_available >= this)
for (current_available = this + 1; current_available->Address(); current_available++);
ReleaseMutex(hmMutex);
return this - hookman;
}
int TextHook::InitHook(const HookParam &h, LPCSTR name, WORD set_flag)
{
WaitForSingleObject(hmMutex, 0);
hp = h;
hp.type |= set_flag;
if (name && name != hook_name) {
SetHookName(name);
}
currentHook++;
current_available = this+1;
while (current_available->Address())
current_available++;
ReleaseMutex(hmMutex);
return 1;
}
int TextHook::RemoveHook()
{
enum : int { yes = 1, no = 0 };
if (!hp.address)
return no;
ConsoleOutput("vnrcli:RemoveHook: enter");
WaitForSingleObject(hmMutex, TIMEOUT); // jichi 9/28/2012: wait at most for 5 seconds
DWORD l = hp.hook_len;
//with_seh({ // jichi 9/17/2013: might crash ><
// jichi 12/25/2013: Actually, __try cannot catch such kind of exception
ITH_TRY {
NtWriteVirtualMemory(GetCurrentProcess(), (LPVOID)hp.address, original, hp.recover_len, &l);
NtFlushInstructionCache(GetCurrentProcess(), (LPVOID)hp.address, hp.recover_len);
} ITH_EXCEPT {}
//});
hp.hook_len = 0;
ReleaseMutex(hmMutex);
ConsoleOutput("vnrcli:RemoveHook: leave");
return yes;
}
int TextHook::ClearHook()
{
WaitForSingleObject(hmMutex, 0);
int err = RemoveHook();
if (hook_name) {
delete[] hook_name;
hook_name = nullptr;
}
memset(this, 0, sizeof(TextHook)); // jichi 11/30/2013: This is the original code of ITH
//if (current_available>this)
// current_available = this;
currentHook--;
ReleaseMutex(hmMutex);
NotifyHookRemove(hp.address);
return err;
}
int TextHook::SetHookName(LPCSTR name)
{
name_length = strlen(name) + 1;
if (hook_name)
delete[] hook_name;
hook_name = new char[name_length];
//ITH_MEMSET_HEAP(hook_name, 0, sizeof(wchar_t) * name_length); // jichi 9/26/2013: zero memory
strcpy(hook_name, name);
return 0;
}
int TextHook::GetLength(DWORD base, DWORD in)
{
if (base == 0)
return 0;
int len;
switch (hp.length_offset) {
default: // jichi 12/26/2013: I should not put this default branch to the end
len = *((int *)base + hp.length_offset);
if (len >= 0) {
if (hp.type & USING_UNICODE)
len <<= 1;
break;
}
else if (len != -1)
break;
//len == -1 then continue to case 0.
case 0:
if (hp.type & USING_UNICODE)
len = wcslen((const wchar_t *)in) << 1;
else
len = strlen((const char *)in);
break;
case 1:
if (hp.type & USING_UNICODE)
len = 2;
else {
if (hp.type & BIG_ENDIAN)
in >>= 8;
len = LeadByteTable[in & 0xff]; //Slightly faster than IsDBCSLeadByte
}
break;
}
// jichi 12/25/2013: This function originally return -1 if failed
//return len;
return max(0, len);
}
// EOF
//typedef void (*DataFun)(DWORD, const HookParam*, DWORD*, DWORD*, DWORD*);
/*
DWORD recv_esp, recv_addr;
EXCEPTION_DISPOSITION ExceptHandler(EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame, CONTEXT *ContextRecord, void *DispatcherContext)
{
//WCHAR str[0x40],
// name[0x100];
//ConsoleOutput(L"Exception raised during hook processing.");
//swprintf(str, L"Exception code: 0x%.8X", ExceptionRecord->ExceptionCode);
//ConsoleOutput(str);
//MEMORY_BASIC_INFORMATION info;
//if (NT_SUCCESS(NtQueryVirtualMemory(GetCurrentProcess(),(PVOID)ContextRecord->Eip,
// MemoryBasicInformation,&info,sizeof(info),0)) &&
// NT_SUCCESS(NtQueryVirtualMemory(GetCurrentProcess(),(PVOID)ContextRecord->Eip,
// MemorySectionName,name,0x200,0))) {
// swprintf(str, L"Exception offset: 0x%.8X:%s",
// ContextRecord->Eip-(DWORD)info.AllocationBase,
// wcsrchr(name,L'\\')+1);
// ConsoleOutput(str);
//}
ContextRecord->Esp = recv_esp;
ContextRecord->Eip = recv_addr;
return ExceptionContinueExecution;
}
//typedef void (*DataFun)(DWORD, const HookParam*, DWORD*, DWORD*, DWORD*);
DWORD recv_esp, recv_addr;
EXCEPTION_DISPOSITION ExceptHandler(EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame, CONTEXT *ContextRecord, void *DispatcherContext)
{
//WCHAR str[0x40],
// name[0x100];
//ConsoleOutput(L"Exception raised during hook processing.");
//swprintf(str, L"Exception code: 0x%.8X", ExceptionRecord->ExceptionCode);
//ConsoleOutput(str);
//MEMORY_BASIC_INFORMATION info;
//if (NT_SUCCESS(NtQueryVirtualMemory(GetCurrentProcess(),(PVOID)ContextRecord->Eip,
// MemoryBasicInformation,&info,sizeof(info),0)) &&
// NT_SUCCESS(NtQueryVirtualMemory(GetCurrentProcess(),(PVOID)ContextRecord->Eip,
// MemorySectionName,name,0x200,0))) {
// swprintf(str, L"Exception offset: 0x%.8X:%s",
// ContextRecord->Eip-(DWORD)info.AllocationBase,
// wcsrchr(name,L'\\')+1);
// ConsoleOutput(str);
//}
ContextRecord->Esp = recv_esp;
ContextRecord->Eip = recv_addr;
return ExceptionContinueExecution;
}
__declspec(naked) // jichi 10/2/2013: No prolog and epilog
int ProcessHook(DWORD dwDataBase, DWORD dwRetn, TextHook *hook) // Use SEH to ensure normal execution even bad hook inserted.
{
__asm
{
mov eax,seh_recover
mov recv_addr,eax
push ExceptHandler
push fs:[0]
mov recv_esp,esp
mov fs:[0],esp
push esi
push edx
call TextHook::Send
test eax,eax
jz seh_recover
mov ecx,SafeExit
mov [esp + 0x8], ecx // change exit point
seh_recover:
pop dword ptr fs:[0]
pop ecx
retn
}
}
*/
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