330 lines
10 KiB
C++
330 lines
10 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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#include "texthook.h"
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#include "main.h"
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#include "ithsys/ithsys.h"
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extern const char* FUNC_MISSING;
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extern const char* MODULE_MISSING;
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extern const char* GARBAGE_MEMORY;
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extern const char* SEND_ERROR;
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extern const char* READ_ERROR;
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extern 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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int this_offset = 9, send_offset = 14, original_offset = 24;
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#else
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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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// https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention
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// https://stackoverflow.com/questions/43358429/save-value-of-xmm-registers
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0x48, 0x83, 0xec, 0x20, // sub rsp,0x20
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0xc5, 0xfa, 0x7f, 0x24, 0x24, // vmovdqu [rsp],xmm4
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0xc5, 0xfa, 0x7f, 0x6c, 0x24, 0x10, // vmovdqu [rsp+0x10],xmm5
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0x48, 0x8d, 0x94, 0x24, 0xa8, 0x00, 0x00, 0x00, // lea rdx,[rsp+0xa8]
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0x48, 0xb9, 0,0,0,0,0,0,0,0, // mov rcx,@this
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0x48, 0xb8, 0,0,0,0,0,0,0,0, // mov rax,@TextHook::Send
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0x48, 0x89, 0xe3, // mov rbx,rsp
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0x48, 0x83, 0xe4, 0xf0, // and rsp,0xfffffffffffffff0 ; align stack
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0xff, 0xd0, // call rax
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0x48, 0x89, 0xdc, // mov rsp,rbx
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0xc5, 0xfa, 0x6f, 0x6c, 0x24, 0x10, // vmovdqu xmm5,XMMWORD PTR[rsp + 0x10]
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0xc5, 0xfa, 0x6f, 0x24, 0x24, // vmovdqu xmm4,XMMWORD PTR[rsp]
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0x48, 0x83, 0xc4, 0x20, // add rsp,0x20
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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, 0x00, 0x00, 0x00, 0x00, // jmp qword ptr [rip] ; relative to next instruction (i.e. jmp @original)
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0,0,0,0,0,0,0,0 // @original
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};
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int this_offset = 50, send_offset = 60, original_offset = 126;
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#endif
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thread_local BYTE buffer[PIPE_BUFFER_SIZE];
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enum { TEXT_BUFFER_SIZE = PIPE_BUFFER_SIZE - sizeof(ThreadParam) };
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} // unnamed namespace
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// - TextHook methods -
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bool TextHook::Insert(HookParam hp, DWORD set_flag)
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{
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{
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std::scoped_lock lock(viewMutex);
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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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this->hp = hp;
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address = hp.address;
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}
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if (hp.type & DIRECT_READ) return InsertReadCode();
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return InsertHookCode();
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}
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// jichi 5/11/2014:
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// - dwDataBase: the stack address
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void TextHook::Send(uintptr_t dwDataBase)
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{
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BYTE(*buffer)[PIPE_BUFFER_SIZE] = &::buffer, *pbData = *buffer + sizeof(ThreadParam);
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_InterlockedIncrement(&useCount);
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__try
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{
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if (auto current_trigger_fun = trigger_fun.exchange(nullptr))
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if (!current_trigger_fun(location, *(DWORD*)(dwDataBase - 0x1c), *(DWORD*)(dwDataBase - 0x18))) trigger_fun = current_trigger_fun;
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#ifndef _WIN64
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DWORD dwCount = 0,
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dwSplit = 0,
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dwDataIn = *(DWORD*)(dwDataBase + hp.offset), // default values
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dwRetn = *(DWORD*)dwDataBase; // first value on stack (if hooked start of function, this is return address)
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// jichi 10/24/2014: generic hook function
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if (hp.hook_fun && !hp.hook_fun(dwDataBase, &hp)) hp.hook_fun = nullptr;
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if (hp.type & HOOK_EMPTY) goto done; // jichi 10/24/2014: dummy hook only for dynamic hook
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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 (hp.type & FIXING_SPLIT) dwSplit = FIXED_SPLIT_VALUE; // fuse all threads, and prevent floating
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else if (hp.type & USING_SPLIT) {
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dwSplit = *(DWORD *)(dwDataBase + hp.split);
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if (hp.type & SPLIT_INDIRECT) dwSplit = *(DWORD *)(dwSplit + hp.split_index);
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}
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if (hp.type & DATA_INDIRECT) dwDataIn = *(DWORD *)(dwDataIn + hp.index);
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dwDataIn += hp.padding;
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dwCount = GetLength(dwDataBase, dwDataIn);
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}
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if (dwCount <= 0) goto done;
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if (dwCount > TEXT_BUFFER_SIZE) dwCount = TEXT_BUFFER_SIZE;
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if (hp.length_offset == 1) {
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dwDataIn &= 0xffff;
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if ((hp.type & BIG_ENDIAN) && (dwDataIn >> 8)) dwDataIn = _byteswap_ushort(dwDataIn & 0xffff);
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if (dwCount == 1) dwDataIn &= 0xff;
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*(WORD*)pbData = dwDataIn & 0xffff;
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}
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else ::memcpy(pbData, (void*)dwDataIn, dwCount);
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if (hp.filter_fun && !hp.filter_fun(pbData, &dwCount, &hp, 0) || dwCount <= 0) goto done;
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if (hp.type & (NO_CONTEXT | FIXING_SPLIT)) dwRetn = 0;
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TextOutput({ GetCurrentProcessId(), address, dwRetn, dwSplit }, buffer, dwCount);
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#else // _WIN32
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if (hp.type & HOOK_EMPTY) goto done; // jichi 10/24/2014: dummy hook only for dynamic hook
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int count = 0;
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ThreadParam tp = { GetCurrentProcessId(), address, *(uintptr_t*)dwDataBase, 0 }; // first value on stack (if hooked start of function, this is return address)
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uintptr_t data = *(uintptr_t*)(dwDataBase + hp.offset); // default value
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if (hp.type & USING_SPLIT)
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{
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tp.ctx2 = *(uintptr_t*)(dwDataBase + hp.split);
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if (hp.type & SPLIT_INDIRECT) tp.ctx2 = *(uintptr_t*)(tp.ctx2 + hp.split_index);
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}
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if (hp.type & DATA_INDIRECT) data = *(uintptr_t*)(data + hp.index);
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data += hp.padding;
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count = GetLength(dwDataBase, data);
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if (count <= 0) goto done;
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if (count > TEXT_BUFFER_SIZE) count = TEXT_BUFFER_SIZE;
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if (hp.length_offset == 1)
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{
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data &= 0xffff;
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if ((hp.type & BIG_ENDIAN) && (data >> 8)) data = _byteswap_ushort(data & 0xffff);
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if (count == 1) data &= 0xff;
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*(WORD*)pbData = data & 0xffff;
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}
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else ::memcpy(pbData, (void*)data, count);
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if (hp.type & (NO_CONTEXT | FIXING_SPLIT)) tp.ctx = 0;
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TextOutput(tp, buffer, count);
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#endif // _WIN64
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}
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__except (EXCEPTION_EXECUTE_HANDLER)
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{
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if (!err && !(hp.type & KNOWN_UNSTABLE))
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{
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err = true;
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ConsoleOutput("%s in %s", SEND_ERROR, hp.name);
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}
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}
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done:
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_InterlockedDecrement(&useCount);
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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)) 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)) address += (uint64_t)moduleBase;
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else return ConsoleOutput(MODULE_MISSING), false;
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VirtualProtect(location, 10, PAGE_EXECUTE_READWRITE, DUMMY);
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void* original;
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MH_STATUS error;
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while ((error = MH_CreateHook(location, trampoline, &original)) != MH_OK)
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if (error == MH_ERROR_ALREADY_CREATED) RemoveHook(address);
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else return ConsoleOutput(MH_StatusToString(error)), false;
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*(TextHook**)(common_hook + this_offset) = this;
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*(void(TextHook::**)(uintptr_t))(common_hook + send_offset) = &TextHook::Send;
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*(void**)(common_hook + original_offset) = original;
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memcpy(trampoline, common_hook, sizeof(common_hook));
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return MH_EnableHook(location) == MH_OK;
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}
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void TextHook::Read()
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{
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int dataLen = 1;
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BYTE(*buffer)[PIPE_BUFFER_SIZE] = &::buffer, *pbData = *buffer + sizeof(ThreadParam);
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__try
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{
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while (WaitForSingleObject(readerEvent, 500) == WAIT_TIMEOUT) if (memcmp(pbData, location, dataLen) != 0) if (int currentLen = HookStrlen((BYTE*)location))
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{
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dataLen = min(currentLen, TEXT_BUFFER_SIZE);
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memcpy(pbData, location, dataLen);
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TextOutput({ GetCurrentProcessId(), 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("%s in %s", READ_ERROR, hp.name);
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Clear();
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}
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}
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bool TextHook::InsertReadCode()
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{
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readerThread = CreateThread(nullptr, 0, [](void* This) { ((TextHook*)This)->Read(); return 0UL; }, 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(location);
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while (useCount != 0);
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MH_RemoveHook(location);
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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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if (address == 0) return;
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if (hp.type & DIRECT_READ) RemoveReadCode();
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else RemoveHookCode();
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NotifyHookRemove(address, hp.name);
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std::scoped_lock lock(viewMutex);
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memset(&hp, 0, sizeof(HookParam));
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address = 0;
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}
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int TextHook::GetLength(uintptr_t base, uintptr_t in)
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{
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int len;
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if (hp.length_fun) return hp.length_fun(base, in);
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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 = *((uintptr_t*)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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len = HookStrlen((BYTE*)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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int TextHook::HookStrlen(BYTE* data)
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{
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if (!hp.null_length) return hp.type & USING_UNICODE ? wcslen((wchar_t*)data) * 2 : strlen((char*)data);
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BYTE* orig = data;
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for (int nullsRemaining = hp.null_length; nullsRemaining > 0; ++data)
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if (*data == 0) nullsRemaining -= 1;
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else nullsRemaining = hp.null_length;
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return data - orig;
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}
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// EOF
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