295 lines
7.3 KiB
C++
295 lines
7.3 KiB
C++
#include "hookcode.h"
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#include "module.h"
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namespace
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{
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std::optional<HookParam> ParseRCode(std::wstring RCode)
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{
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std::wsmatch match;
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HookParam hp = {};
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hp.type |= DIRECT_READ;
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// {S|Q|V|M}
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switch (RCode[0])
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{
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case L'S':
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break;
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case L'Q':
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hp.type |= USING_UNICODE;
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break;
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case L'V':
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hp.type |= USING_UTF8;
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break;
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case L'M':
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hp.type |= USING_UNICODE | HEX_DUMP;
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break;
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default:
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return {};
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}
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RCode.erase(0, 1);
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// [null_length<]
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if (std::regex_search(RCode, match, std::wregex(L"^([0-9]+)<")))
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{
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hp.null_length = std::stoi(match[1]);
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RCode.erase(0, match[0].length());
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}
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// [codepage#]
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if (std::regex_search(RCode, match, std::wregex(L"^([0-9]+)#")))
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{
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hp.codepage = std::stoi(match[1]);
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RCode.erase(0, match[0].length());
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}
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// @addr
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if (!std::regex_match(RCode, match, std::wregex(L"@([[:xdigit:]]+)"))) return {};
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hp.address = std::stoull(match[1], nullptr, 16);
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return hp;
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}
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std::optional<HookParam> ParseHCode(std::wstring HCode)
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{
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std::wsmatch match;
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HookParam hp = {};
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// {A|B|W|H|S|Q|V|M}
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switch (HCode[0])
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{
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case L'A':
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hp.type |= BIG_ENDIAN;
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hp.length_offset = 1;
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break;
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case L'B':
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hp.length_offset = 1;
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break;
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case L'W':
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hp.type |= USING_UNICODE;
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hp.length_offset = 1;
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break;
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case L'H':
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hp.type |= USING_UNICODE | HEX_DUMP;
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hp.length_offset = 1;
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break;
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case L'S':
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hp.type |= USING_STRING;
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break;
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case L'Q':
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hp.type |= USING_STRING | USING_UNICODE;
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break;
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case L'V':
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hp.type |= USING_STRING | USING_UTF8;
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break;
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case L'M':
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hp.type |= USING_STRING | USING_UNICODE | HEX_DUMP;
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break;
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default:
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return {};
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}
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HCode.erase(0, 1);
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if ((hp.type & USING_STRING))
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{
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if (HCode[0] == L'F')
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{
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hp.type |= FULL_STRING;
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HCode.erase(0, 1);
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}
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// [null_length<]
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if (std::regex_search(HCode, match, std::wregex(L"^([0-9]+)<")))
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{
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hp.null_length = std::stoi(match[1]);
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HCode.erase(0, match[0].length());
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}
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}
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// [N]
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if (HCode[0] == L'N')
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{
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hp.type |= NO_CONTEXT;
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HCode.erase(0, 1);
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}
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// [codepage#]
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if (std::regex_search(HCode, match, std::wregex(L"^([0-9]+)#")))
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{
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hp.codepage = std::stoi(match[1]);
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HCode.erase(0, match[0].length());
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}
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// [padding+]
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if (std::regex_search(HCode, match, std::wregex(L"^([[:xdigit:]]+)\\+")))
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{
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hp.padding = std::stoull(match[1], nullptr, 16);
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HCode.erase(0, match[0].length());
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}
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// data_offset
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if (!std::regex_search(HCode, match, std::wregex(L"^-?[[:xdigit:]]+"))) return {};
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hp.offset = std::stoi(match[0], nullptr, 16);
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HCode.erase(0, match[0].length());
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// [*deref_offset1]
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if (std::regex_search(HCode, match, std::wregex(L"^\\*(-?[[:xdigit:]]+)")))
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{
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hp.type |= DATA_INDIRECT;
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hp.index = std::stoi(match[1], nullptr, 16);
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HCode.erase(0, match[0].length());
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}
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// [:split_offset[*deref_offset2]]
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if (std::regex_search(HCode, match, std::wregex(L"^:(-?[[:xdigit:]]+)")))
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{
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hp.type |= USING_SPLIT;
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hp.split = std::stoi(match[1], nullptr, 16);
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HCode.erase(0, match[0].length());
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if (std::regex_search(HCode, match, std::wregex(L"^\\*(-?[[:xdigit:]]+)")))
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{
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hp.type |= SPLIT_INDIRECT;
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hp.split_index = std::stoi(match[1], nullptr, 16);
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HCode.erase(0, match[0].length());
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}
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}
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// @addr[:module[:func]]
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if (!std::regex_match(HCode, match, std::wregex(L"@([[:xdigit:]]+)(:.+?)?(:.+)?"))) return {};
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hp.address = std::stoull(match[1], nullptr, 16);
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if (match[2].matched)
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{
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hp.type |= MODULE_OFFSET;
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wcsncpy_s(hp.module, match[2].str().erase(0, 1).c_str(), MAX_MODULE_SIZE - 1);
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}
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if (match[3].matched)
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{
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hp.type |= FUNCTION_OFFSET;
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std::wstring func = match[3];
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strncpy_s(hp.function, std::string(func.begin(), func.end()).erase(0, 1).c_str(), MAX_MODULE_SIZE - 1);
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}
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// ITH has registers offset by 4 vs AGTH: need this to correct
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if (hp.offset < 0) hp.offset -= 4;
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if (hp.split < 0) hp.split -= 4;
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return hp;
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}
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std::wstring HexString(int64_t num)
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{
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if (num < 0) return FormatString(L"-%I64X", -num);
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return FormatString(L"%I64X", num);
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}
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std::wstring GenerateRCode(HookParam hp)
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{
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std::wstring RCode = L"R";
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if (hp.type & USING_UNICODE)
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{
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if (hp.type & HEX_DUMP) RCode += L'M';
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else RCode += L'Q';
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if (hp.null_length != 0) RCode += std::to_wstring(hp.null_length) + L'<';
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}
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else
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{
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RCode += L'S';
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if (hp.null_length != 0) RCode += std::to_wstring(hp.null_length) + L'<';
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if (hp.codepage != 0) RCode += std::to_wstring(hp.codepage) + L'#';
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}
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RCode += L'@' + HexString(hp.address);
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return RCode;
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}
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std::wstring GenerateHCode(HookParam hp, DWORD processId)
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{
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std::wstring HCode = L"H";
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if (hp.type & USING_UNICODE)
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{
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if (hp.type & HEX_DUMP)
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{
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if (hp.type & USING_STRING) HCode += L'M';
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else HCode += L'H';
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}
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else
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{
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if (hp.type & USING_STRING) HCode += L'Q';
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else HCode += L'W';
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}
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}
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else
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{
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if (hp.type & USING_STRING) HCode += L'S';
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else if (hp.type & BIG_ENDIAN) HCode += L'A';
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else HCode += L'B';
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}
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if (hp.type & FULL_STRING) HCode += L'F';
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if (hp.null_length != 0) HCode += std::to_wstring(hp.null_length) + L'<';
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if (hp.type & NO_CONTEXT) HCode += L'N';
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if (hp.text_fun || hp.filter_fun || hp.hook_fun || hp.length_fun) HCode += L'X'; // no AGTH equivalent
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if (hp.codepage != 0 && !(hp.type & USING_UNICODE)) HCode += std::to_wstring(hp.codepage) + L'#';
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if (hp.padding) HCode += HexString(hp.padding) + L'+';
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if (hp.offset < 0) hp.offset += 4;
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if (hp.split < 0) hp.split += 4;
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HCode += HexString(hp.offset);
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if (hp.type & DATA_INDIRECT) HCode += L'*' + HexString(hp.index);
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if (hp.type & USING_SPLIT) HCode += L':' + HexString(hp.split);
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if (hp.type & SPLIT_INDIRECT) HCode += L'*' + HexString(hp.split_index);
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// Attempt to make the address relative
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if (processId && !(hp.type & MODULE_OFFSET))
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if (AutoHandle<> process = OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, FALSE, processId))
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if (MEMORY_BASIC_INFORMATION info = {}; VirtualQueryEx(process, (LPCVOID)hp.address, &info, sizeof(info)))
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if (auto moduleName = GetModuleFilename(processId, (HMODULE)info.AllocationBase))
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{
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hp.type |= MODULE_OFFSET;
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hp.address -= (uint64_t)info.AllocationBase;
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wcsncpy_s(hp.module, moduleName->c_str() + moduleName->rfind(L'\\') + 1, MAX_MODULE_SIZE - 1);
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}
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HCode += L'@' + HexString(hp.address);
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if (hp.type & MODULE_OFFSET) HCode += L':' + std::wstring(hp.module);
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if (hp.type & FUNCTION_OFFSET) HCode += L':' + StringToWideString(hp.function);
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return HCode;
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}
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}
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namespace HookCode
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{
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std::optional<HookParam> Parse(std::wstring code)
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{
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if (code[0] == L'/') code.erase(0, 1); // legacy/AGTH compatibility
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if (code[0] == L'R') return ParseRCode(code.erase(0, 1));
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else if (code[0] == L'H') return ParseHCode(code.erase(0, 1));
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return {};
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}
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std::wstring Generate(HookParam hp, DWORD processId)
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{
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return hp.type & DIRECT_READ ? GenerateRCode(hp) : GenerateHCode(hp, processId);
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}
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TEST(
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assert(StringToWideString(u8"こんにちは").value() == L"こんにちは"),
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assert(HexString(-12) == L"-C"),
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assert(HexString(12) == L"C"),
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assert(ParseCode(L"/HQN936#-c*C:C*1C@4AA:gdi.dll:GetTextOutA")),
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assert(ParseCode(L"HB4@0")),
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assert(ParseCode(L"/RS65001#@44")),
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assert(!ParseCode(L"HQ@4")),
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assert(!ParseCode(L"/RW@44")),
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assert(!ParseCode(L"/HWG@33"))
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);
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}
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