util.cc
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// util/util.cc
// 8/23/2013 jichi
// Branch: ITH_Engine/engine.cpp, revision 133
// See: http://ja.wikipedia.org/wiki/プロジェクト:美少女ゲーム系/ゲームエンジン
#include "src/util/util.h"
#include "ithsys/ithsys.h"
namespace { // unnamed
// jichi 4/19/2014: Return the integer that can mask the signature
DWORD SigMask(DWORD sig)
{
__asm
{
xor ecx,ecx
mov eax,sig
_mask:
shr eax,8
inc ecx
test eax,eax
jnz _mask
sub ecx,4
neg ecx
or eax,-1
shl ecx,3
shr eax,cl
}
}
} // namespace unnamed
// jichi 8/24/2013: binary search?
DWORD Util::GetCodeRange(DWORD hModule,DWORD *low, DWORD *high)
{
IMAGE_DOS_HEADER *DosHdr;
IMAGE_NT_HEADERS *NtHdr;
DWORD dwReadAddr;
IMAGE_SECTION_HEADER *shdr;
DosHdr = (IMAGE_DOS_HEADER *)hModule;
if (IMAGE_DOS_SIGNATURE == DosHdr->e_magic) {
dwReadAddr = hModule + DosHdr->e_lfanew;
NtHdr = (IMAGE_NT_HEADERS *)dwReadAddr;
if (IMAGE_NT_SIGNATURE == NtHdr->Signature) {
shdr = (PIMAGE_SECTION_HEADER)((DWORD)(&NtHdr->OptionalHeader) + NtHdr->FileHeader.SizeOfOptionalHeader);
while ((shdr->Characteristics & IMAGE_SCN_CNT_CODE) == 0)
shdr++;
*low = hModule + shdr->VirtualAddress;
*high = *low + (shdr->Misc.VirtualSize & 0xfffff000) + 0x1000;
}
}
return 0;
}
DWORD Util::FindCallAndEntryBoth(DWORD fun, DWORD size, DWORD pt, DWORD sig)
{
//WCHAR str[0x40];
enum { reverse_length = 0x800 };
DWORD t, l;
DWORD mask = SigMask(sig);
bool flag2;
for (DWORD i = 0x1000; i < size-4; i++) {
bool flag1 = false;
if (*(BYTE *)(pt + i) == 0xe8) {
flag1 = flag2 = true;
t = *(DWORD *)(pt + i + 1);
} else if (*(WORD *)(pt + i) == 0x15ff) {
flag1 = true;
flag2 = false;
t = *(DWORD *)(pt + i + 2);
}
if (flag1) {
if (flag2) {
flag1 = (pt + i + 5 + t == fun);
l = 5;
} else if (t >= pt && t <= pt + size - 4) {
flag1 = fun == *(DWORD *)t;
l = 6;
} else
flag1 = false;
if (flag1)
//swprintf(str,L"CALL addr: 0x%.8X",pt + i);
//OutputConsole(str);
for (DWORD j = i; j > i - reverse_length; j--)
if ((*(WORD *)(pt + j)) == (sig & mask)) //Fun entry 1.
//swprintf(str,L"Entry: 0x%.8X",pt + j);
//OutputConsole(str);
return pt + j;
else
i += l;
}
}
//OutputConsole(L"Find call and entry failed.");
return 0;
}
DWORD Util::FindCallOrJmpRel(DWORD fun, DWORD size, DWORD pt, bool jmp)
{
BYTE sig = (jmp) ? 0xe9 : 0xe8;
for (DWORD i = 0x1000; i < size - 4; i++)
if (sig == *(BYTE *)(pt + i)) {
DWORD t = *(DWORD *)(pt + i + 1);
if(fun == pt + i + 5 + t)
//OutputDWORD(pt + i);
return pt + i;
else
i += 5;
}
return 0;
}
DWORD Util::FindCallOrJmpAbs(DWORD fun, DWORD size, DWORD pt, bool jmp)
{
WORD sig = jmp ? 0x25ff : 0x15ff;
for (DWORD i = 0x1000; i < size - 4; i++)
if (sig == *(WORD *)(pt + i)) {
DWORD t = *(DWORD *)(pt + i + 2);
if (t > pt && t < pt + size) {
if (fun == *(DWORD *)t)
return pt + i;
else
i += 5;
}
}
return 0;
}
DWORD Util::FindCallBoth(DWORD fun, DWORD size, DWORD pt)
{
for (DWORD i = 0x1000; i < size - 4; i++) {
if (*(BYTE *)(pt + i) == 0xe8) {
DWORD t = *(DWORD *)(pt + i + 1) + pt + i + 5;
if (t == fun)
return i;
}
if (*(WORD *)(pt + i) == 0x15ff) {
DWORD t = *(DWORD *)(pt + i + 2);
if (t >= pt && t <= pt + size - 4) {
if (*(DWORD *)t == fun)
return i;
else
i += 6;
}
}
}
return 0;
}
DWORD Util::FindCallAndEntryAbs(DWORD fun, DWORD size, DWORD pt, DWORD sig)
{
//WCHAR str[0x40];
enum { reverse_length = 0x800 };
DWORD mask = SigMask(sig);
for (DWORD i = 0x1000; i < size - 4; i++)
if (*(WORD *)(pt + i) == 0x15ff) {
DWORD t = *(DWORD *)(pt + i + 2);
if (t >= pt && t <= pt + size - 4) {
if (*(DWORD *)t == fun)
//swprintf(str,L"CALL addr: 0x%.8X",pt + i);
//OutputConsole(str);
for (DWORD j = i ; j > i - reverse_length; j--)
if ((*(DWORD *)(pt + j) & mask) == sig) // Fun entry 1.
//swprintf(str,L"Entry: 0x%.8X",pt + j);
//OutputConsole(str);
return pt + j;
} else
i += 6;
}
//OutputConsole(L"Find call and entry failed.");
return 0;
}
DWORD Util::FindCallAndEntryRel(DWORD fun, DWORD size, DWORD pt, DWORD sig)
{
//WCHAR str[0x40];
enum { reverse_length = 0x800 };
if (DWORD i = FindCallOrJmpRel(fun, size, pt, false)) {
DWORD mask = SigMask(sig);
for (DWORD j = i; j > i - reverse_length; j--)
if (((*(DWORD *)j) & mask) == sig) //Fun entry 1.
//swprintf(str,L"Entry: 0x%.8X",j);
//OutputConsole(str);
return j;
//OutputConsole(L"Find call and entry failed.");
}
return 0;
}
DWORD Util::FindEntryAligned(DWORD start, DWORD back_range)
{
start &= ~0xf;
for (DWORD i = start, j = start - back_range; i > j; i-=0x10) {
DWORD k = *(DWORD *)(i-4);
if (k == 0xcccccccc
|| k == 0x90909090
|| k == 0xccccccc3
|| k == 0x909090c3
)
return i;
DWORD t = k & 0xff0000ff;
if (t == 0xcc0000c2 || t == 0x900000c2)
return i;
k >>= 8;
if (k == 0xccccc3 || k == 0x9090c3)
return i;
t = k & 0xff;
if (t == 0xc2)
return i;
k >>= 8;
if (k == 0xccc3 || k == 0x90c3)
return i;
k >>= 8;
if (k == 0xc3)
return i;
}
return 0;
}
DWORD Util::FindImportEntry(DWORD hModule, DWORD fun)
{
IMAGE_DOS_HEADER *DosHdr;
IMAGE_NT_HEADERS *NtHdr;
DWORD IAT, end, pt, addr;
DosHdr = (IMAGE_DOS_HEADER *)hModule;
if (IMAGE_DOS_SIGNATURE == DosHdr->e_magic) {
NtHdr = (IMAGE_NT_HEADERS *)(hModule + DosHdr->e_lfanew);
if (IMAGE_NT_SIGNATURE == NtHdr->Signature) {
IAT = NtHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress;
end = NtHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].Size;
IAT += hModule;
end += IAT;
for (pt = IAT; pt < end; pt += 4) {
addr = *(DWORD *)pt;
if (addr == fun)
return pt;
}
}
}
return 0;
}
// Search string in rsrc section. This section usually contains version and copyright info.
bool Util::SearchResourceString(LPCWSTR str)
{
DWORD hModule = Util::GetModuleBase();
IMAGE_DOS_HEADER *DosHdr;
IMAGE_NT_HEADERS *NtHdr;
DosHdr = (IMAGE_DOS_HEADER *)hModule;
DWORD rsrc, size;
//__asm int 3
if (IMAGE_DOS_SIGNATURE == DosHdr->e_magic) {
NtHdr = (IMAGE_NT_HEADERS *)(hModule + DosHdr->e_lfanew);
if (IMAGE_NT_SIGNATURE == NtHdr->Signature) {
rsrc = NtHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress;
if (rsrc) {
rsrc += hModule;
if (IthGetMemoryRange((LPVOID)rsrc, &rsrc ,&size) &&
SearchPattern(rsrc, size - 4, str, wcslen(str) << 1))
return true;
}
}
}
return false;
}
// jichi 4/15/2014: Copied from GetModuleBase in ITH CLI, for debugging purpose
DWORD Util::FindModuleBase(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:
}
}
EXTERN_C IMAGE_DOS_HEADER __ImageBase;
// See: http://stackoverflow.com/questions/3410130/dll-unloading-itself
bool Util::unloadCurrentModule()
{
auto fun = ::FreeLibrary;
//auto fun = ::LdrUnloadDll;
if (HANDLE h = ::IthCreateThread(fun, (DWORD)&__ImageBase)) {
//const LONGLONG timeout = -50000000; // in nanoseconds = 5 seconds
//NtWaitForSingleObject(h, 0, (PLARGE_INTEGER)&timeout);
NtClose(h);
return true;
}
// CreateThread does not always work on Windows XP. Use IthCreateThread (i.e. CreateRemoteThread under the water) instead.
//if (HANDLE h = ::CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)fun, &__ImageBase, 0, NULL)) {
// ::CloseHandle(h);
// return true;
//}
return false;
}
// EOF