346 lines
9.3 KiB
C++
346 lines
9.3 KiB
C++
// texthook.cc
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// 8/24/2013 jichi
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// Branch: ITH_DLL/texthook.cpp, rev 128
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// 8/24/2013 TODO: Clean up this file
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#ifdef _MSC_VER
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# pragma warning (disable:4100) // C4100: unreference formal parameter
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# pragma warning (disable:4018) // C4018: sign/unsigned mismatch
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//# pragma warning (disable:4733) // C4733: Inline asm assigning to 'FS:0' : handler not registered as safe handler
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#endif // _MSC_VER
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#include "texthook.h"
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#include "MinHook.h"
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#include "engine/match.h"
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#include "main.h"
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#include "const.h"
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#include "text.h"
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#include "ithsys/ithsys.h"
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#include "growl.h"
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#include <Psapi.h>
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extern std::unique_ptr<WinMutex> viewMutex;
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// - Unnamed helpers -
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namespace { // unnamed
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#ifndef _WIN64
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BYTE common_hook[] = {
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0x9c, // pushfd
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0x60, // pushad
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0x9c, // pushfd ; Artikash 11/4/2018: not sure why pushfd happens twice. Anyway, after this a total of 0x28 bytes are pushed
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0x8d, 0x44, 0x24, 0x28, // lea eax,[esp+0x28]
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0x50, // push eax ; dwDatabase
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0xb9, 0,0,0,0, // mov ecx,@this
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0xbb, 0,0,0,0, // mov ebx,@TextHook::Send
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0xff, 0xd3, // call ebx
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0x9d, // popfd
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0x61, // popad
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0x9d, // popfd
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0x68, 0,0,0,0, // push @original
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0xc3 // ret ; basically absolute jmp to @original
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};
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#else
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const BYTE common_hook[] = {
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0x9c, // push rflags
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0x50, // push rax
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0x53, // push rbx
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0x51, // push rcx
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0x52, // push rdx
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0x54, // push rsp
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0x55, // push rbp
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0x56, // push rsi
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0x57, // push rdi
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0x41, 0x50, // push r8
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0x41, 0x51, // push r9
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0x41, 0x52, // push r10
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0x41, 0x53, // push r11
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0x41, 0x54, // push r12
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0x41, 0x55, // push r13
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0x41, 0x56, // push r14
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0x41, 0x57, // push r15
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0x48, 0x8b, 0xd4, // mov rdx,rsp
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0x48, 0xb9, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, // mov rcx, ?? ; pointer to TextHook
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0xff, 0x15, 0x02, 0x0, 0x0, 0x0, 0xeb, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, // call TextHook::Send
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0x41, 0x5f, // pop r15
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0x41, 0x5e, // pop r14
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0x41, 0x5d, // pop r13
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0x41, 0x5c, // pop r12
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0x41, 0x5b, // pop r11
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0x41, 0x5a, // pop r10
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0x41, 0x59, // pop r9
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0x41, 0x58, // pop r8
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0x5f, // pop rdi
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0x5e, // pop rsi
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0x5d, // pop rbp
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0x5c, // pop rsp
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0x5a, // pop rdx
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0x59, // pop rcx
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0x5b, // pop rbx
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0x58, // pop rax
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0x9d, // pop rflags
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0xff, 0x25, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 // jmp @original
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};
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#endif
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bool trigger = false;
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} // unnamed namespace
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void SetTrigger()
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{
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trigger = true;
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}
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// - TextHook methods -
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bool TextHook::Insert(HookParam h, DWORD set_flag)
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{
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LOCK(*viewMutex);
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hp = h;
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hp.insertion_address = hp.address;
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hp.type |= set_flag;
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if (hp.type & USING_UTF8) hp.codepage = CP_UTF8;
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if (hp.type & DIRECT_READ) return InsertReadCode();
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#ifndef _WIN64
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else return InsertHookCode();
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#endif
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return false;
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}
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#ifndef _WIN64
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// jichi 5/11/2014:
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// - dwDataBase: the stack address
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void TextHook::Send(DWORD dwDataBase)
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{
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__try
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{
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DWORD dwCount,
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dwAddr,
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dwDataIn,
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dwRetn,
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dwSplit;
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BYTE pbData[PIPE_BUFFER_SIZE];
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DWORD dwType = hp.type;
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dwAddr = hp.insertion_address;
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dwRetn = *(DWORD*)dwDataBase; // first value on stack (if hooked start of function, this is return address)
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if (trigger)
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trigger = Engine::InsertDynamicHook((LPVOID)dwAddr, *(DWORD *)(dwDataBase - 0x1c), *(DWORD *)(dwDataBase - 0x18));
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// jichi 10/24/2014: generic hook function
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if (hp.hook_fun && !hp.hook_fun(dwDataBase, &hp))
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hp.hook_fun = nullptr;
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if (dwType & HOOK_EMPTY) return; // jichi 10/24/2014: dummy hook only for dynamic hook
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dwCount = 0;
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dwSplit = 0;
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dwDataIn = *(DWORD *)(dwDataBase + hp.offset); // default value
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if (hp.text_fun) {
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hp.text_fun(dwDataBase, &hp, 0, &dwDataIn, &dwSplit, &dwCount);
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}
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else {
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if (dwDataIn == 0)
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return;
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if (dwType & FIXING_SPLIT)
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dwSplit = FIXED_SPLIT_VALUE; // fuse all threads, and prevent floating
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else if (dwType & USING_SPLIT) {
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dwSplit = *(DWORD *)(dwDataBase + hp.split);
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if (dwType & SPLIT_INDIRECT) {
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if (IthGetMemoryRange((LPVOID)(dwSplit + hp.split_index), 0, 0)) dwSplit = *(DWORD *)(dwSplit + hp.split_index);
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else return;
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}
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}
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if (dwType & DATA_INDIRECT) {
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if (IthGetMemoryRange((LPVOID)(dwDataIn + hp.index), 0, 0)) dwDataIn = *(DWORD *)(dwDataIn + hp.index);
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else return;
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}
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dwCount = GetLength(dwDataBase, dwDataIn);
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}
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if (dwCount == 0 || dwCount > PIPE_BUFFER_SIZE - sizeof(ThreadParam)) return;
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if (hp.length_offset == 1) {
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dwDataIn &= 0xffff;
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if ((dwType & BIG_ENDIAN) && (dwDataIn >> 8))
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dwDataIn = _byteswap_ushort(dwDataIn & 0xffff);
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if (dwCount == 1)
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dwDataIn &= 0xff;
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*(WORD*)pbData = dwDataIn & 0xffff;
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}
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else
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::memcpy(pbData, (void*)dwDataIn, dwCount);
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if (hp.filter_fun && !hp.filter_fun(pbData, &dwCount, &hp, 0) || dwCount <= 0) return;
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if (dwType & (NO_CONTEXT | FIXING_SPLIT))
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dwRetn = 0;
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TextOutput({ GetCurrentProcessId(), dwAddr, dwRetn, dwSplit }, pbData, dwCount);
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}
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__except (EXCEPTION_EXECUTE_HANDLER)
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{
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ConsoleOutput("Textractor: Send ERROR (likely an incorrect H-code)");
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}
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}
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bool TextHook::InsertHookCode()
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{
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// jichi 9/17/2013: might raise 0xC0000005 AccessViolationException on win7
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// Artikash 10/30/2018: No, I think that's impossible now that I moved to minhook
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if (hp.type & MODULE_OFFSET) // Map hook offset to real address
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if (hp.type & FUNCTION_OFFSET)
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if (FARPROC function = GetProcAddress(GetModuleHandleW(hp.module), hp.function)) hp.insertion_address += (uint64_t)function;
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else return ConsoleOutput(FUNC_MISSING), false;
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else if (HMODULE moduleBase = GetModuleHandleW(hp.module)) hp.insertion_address += (uint64_t)moduleBase;
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else return ConsoleOutput(MODULE_MISSING), false;
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void* original;
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insert:
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if (MH_STATUS err = MH_CreateHook((void*)hp.insertion_address, (void*)trampoline, &original))
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if (err == MH_ERROR_ALREADY_CREATED)
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{
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RemoveHook(hp.insertion_address);
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goto insert; // FIXME: i'm too lazy to do this properly right now...
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}
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else
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{
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ConsoleOutput(MH_StatusToString(err));
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return false;
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}
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#ifndef _WIN64
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*(TextHook**)(common_hook + 9) = this;
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*(void(TextHook::**)(DWORD))(common_hook + 14) = &TextHook::Send;
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*(void**)(common_hook + 24) = original;
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memcpy(trampoline, common_hook, sizeof(common_hook));
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#else // _WIN32
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BYTE* original;
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MH_CreateHook((void*)hp.address, (void*)trampoline, (void**)&original);
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memcpy(trampoline, common_hook, sizeof(common_hook));
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void* thisPtr = (void*)this;
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memcpy(trampoline + 30, &thisPtr, sizeof(void*));
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auto sendPtr = (void(TextHook::*)(void*))&TextHook::Send;
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memcpy(trampoline + 46, &sendPtr, sizeof(sendPtr));
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memcpy(trampoline + sizeof(common_hook) - 8, &original, sizeof(void*));
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#endif // _WIN64
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return MH_EnableHook((void*)hp.insertion_address) == MH_OK;
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}
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#endif // _WIN32
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DWORD WINAPI Reader(LPVOID hookPtr)
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{
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TextHook* hook = (TextHook*)hookPtr;
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BYTE buffer[PIPE_BUFFER_SIZE] = {};
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unsigned int changeCount = 0;
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int dataLen = 0;
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__try
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{
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const void* currentAddress = (void*)hook->hp.insertion_address;
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while (WaitForSingleObject(hook->readerEvent, 500) == WAIT_TIMEOUT)
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{
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if (hook->hp.type & DATA_INDIRECT) currentAddress = *((char**)hook->hp.insertion_address + hook->hp.index);
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if (memcmp(buffer, currentAddress, dataLen + 1) == 0)
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{
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changeCount = 0;
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continue;
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}
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if (++changeCount > 10)
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{
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ConsoleOutput(GARBAGE_MEMORY);
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hook->Clear();
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break;
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}
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if (hook->hp.type & USING_UNICODE)
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dataLen = wcslen((const wchar_t*)currentAddress) * 2;
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else
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dataLen = strlen((const char*)currentAddress);
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memcpy(buffer, currentAddress, dataLen + 1);
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TextOutput({ GetCurrentProcessId(), hook->hp.insertion_address, 0, 0 }, buffer, dataLen);
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}
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}
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__except (EXCEPTION_EXECUTE_HANDLER)
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{
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ConsoleOutput("Textractor: Reader ERROR (likely an incorrect R-code)");
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hook->Clear();
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}
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return 0;
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}
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bool TextHook::InsertReadCode()
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{
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readerThread = CreateThread(nullptr, 0, Reader, this, 0, nullptr);
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readerEvent = CreateEventW(nullptr, FALSE, FALSE, NULL);
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return true;
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}
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void TextHook::RemoveHookCode()
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{
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MH_DisableHook((void*)hp.insertion_address);
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MH_RemoveHook((void*)hp.insertion_address);
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}
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void TextHook::RemoveReadCode()
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{
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SetEvent(readerEvent);
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if (GetThreadId(readerThread) != GetCurrentThreadId()) WaitForSingleObject(readerThread, 1000);
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CloseHandle(readerEvent);
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CloseHandle(readerThread);
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}
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void TextHook::Clear()
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{
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LOCK(*viewMutex);
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ConsoleOutput(REMOVING_HOOK, hp.name);
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if (hp.type & DIRECT_READ) RemoveReadCode();
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else RemoveHookCode();
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NotifyHookRemove(hp.insertion_address);
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memset(this, 0, sizeof(TextHook)); // jichi 11/30/2013: This is the original code of ITH
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}
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int TextHook::GetLength(DWORD base, DWORD in)
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{
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if (base == 0)
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return 0;
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int len;
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switch (hp.length_offset) {
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default: // jichi 12/26/2013: I should not put this default branch to the end
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len = *((int *)base + hp.length_offset);
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if (len >= 0) {
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if (hp.type & USING_UNICODE)
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len <<= 1;
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break;
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}
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else if (len != -1)
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break;
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//len == -1 then continue to case 0.
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case 0:
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if (hp.type & USING_UNICODE)
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len = wcslen((const wchar_t *)in) << 1;
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else
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len = strlen((const char *)in);
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break;
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case 1:
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if (hp.type & USING_UNICODE)
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len = 2;
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else {
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if (hp.type & BIG_ENDIAN)
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in >>= 8;
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len = LeadByteTable[in & 0xff]; //Slightly faster than IsDBCSLeadByte
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}
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break;
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}
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// jichi 12/25/2013: This function originally return -1 if failed
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//return len;
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return max(0, len);
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}
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// EOF
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