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719 lines
22 KiB
719 lines
22 KiB
/*
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* Copyright (c) 2020 Bitdefender
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <iostream>
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#include <fstream>
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#include <memory>
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#include <limits>
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#include <cmath>
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#include "external/argparse.h"
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#include "disasm.hpp"
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static const long NSEC_PER_SEC = (1000ULL * 1000ULL * 1000ULL);
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static const char *gSpaces[16] =
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{
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"",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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};
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struct options {
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size_t rip;
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size_t offset;
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size_t size;
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size_t count;
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uint8_t bits;
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uint8_t vendor;
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bool no_color;
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bool verbose;
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bool dump_stats;
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bool interactive;
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bool comm;
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bool json_output;
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bool extended;
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std::string in_file;
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std::string hex_string;
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std::string hex_file;
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// From here on, these are set internally
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std::unique_ptr<uint8_t[]> bytes;
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size_t actual_size;
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int address_size;
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bool output_redirected;
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};
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extern "C"
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{
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int nd_vsnprintf_s(char *buffer, size_t sizeOfBuffer, [[maybe_unused]] size_t count, const char *format, va_list argptr)
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{
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return vsnprintf(buffer, sizeOfBuffer, format, argptr);
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}
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void *
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nd_memset(void *s, int c, size_t n)
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{
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return memset(s, c, n);
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}
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}
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static bool _hexstring_to_bytes(options &opts)
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{
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if (!opts.hex_file.empty()) {
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auto f = std::ifstream(opts.hex_file, std::ios::in);
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if (!f.is_open()) {
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std::cerr << "Failed to open file " << opts.hex_file << std::endl;
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return false;
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}
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f.seekg(0, std::ios::end);
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opts.hex_string.reserve(f.tellg());
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f.seekg(0, std::ios::beg);
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opts.hex_string.assign((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
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}
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if (opts.hex_string.empty())
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return false;
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opts.actual_size = 0;
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opts.hex_string.erase(std::remove_if(opts.hex_string.begin(), opts.hex_string.end(), isspace), opts.hex_string.end());
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// This is the maximum size, not the actual size
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auto initial_size = opts.hex_string.length() / 2;
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opts.bytes = std::make_unique<uint8_t[]>(initial_size);
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auto bytes = opts.bytes.get();
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for (size_t i = 0; i < opts.hex_string.length(); i += 2) {
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auto pair = opts.hex_string.substr(i, 2);
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char *end_ptr;
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if (pair == "0x" || pair == "0X" || pair == "\\x")
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continue;
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auto b = static_cast<uint8_t>(std::strtoul(pair.c_str(), &end_ptr, 16));
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size_t conv_size = static_cast<size_t>(end_ptr - pair.c_str());
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if (conv_size != pair.length()) {
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std::cerr << "Trying to convert invalid hex number: " << pair << std::endl;
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return false;
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}
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bytes[opts.actual_size++] = b;
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}
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return true;
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}
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static bool _file_to_bytes(options &opts)
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{
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auto f = std::ifstream(opts.in_file, std::ios::in | std::ios::binary);
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if (!f.is_open()) {
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std::cerr << "Failed to open file " << opts.in_file << std::endl;
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return false;
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}
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f.seekg(0, std::ios::end);
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opts.actual_size = f.tellg();
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if (opts.offset >= opts.actual_size) {
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std::cerr << "Offset bigger than file size" << std::endl;
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return false;
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}
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f.seekg(0, std::ios::beg);
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opts.bytes = std::make_unique<uint8_t[]>(opts.actual_size);
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f.read(reinterpret_cast<char*>(opts.bytes.get()), opts.actual_size);
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return true;
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}
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// Don't change the order (on linux these values are color codes)
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enum Colors {
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Reset = 0,
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#if defined(_WIN32)
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Red = FOREGROUND_INTENSITY | FOREGROUND_RED,
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Green = FOREGROUND_INTENSITY | FOREGROUND_GREEN,
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Yellow = FOREGROUND_INTENSITY | FOREGROUND_RED | FOREGROUND_GREEN,
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Blue = FOREGROUND_INTENSITY | FOREGROUND_BLUE,
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Magenta = FOREGROUND_INTENSITY | FOREGROUND_BLUE | FOREGROUND_RED,
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Cyan = FOREGROUND_INTENSITY | FOREGROUND_BLUE | FOREGROUND_GREEN,
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White = FOREGROUND_INTENSITY | FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED,
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#elif defined(__unix__)
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Red,
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Green,
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Yellow,
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Blue,
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Magenta,
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Cyan,
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White,
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#endif
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};
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static void _set_text_color(Colors color)
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{
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#if defined(_WIN32)
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static WORD old_attrs = -1;
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if (old_attrs == -1) {
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CONSOLE_SCREEN_BUFFER_INFO buffer_info;
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GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &buffer_info);
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old_attrs = buffer_info.wAttributes;
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}
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if (color == Reset)
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SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), old_attrs);
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else
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SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), color);
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#elif defined(__unix__)
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if (color == Reset)
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std::cout << "\033[m";
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else
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std::cout << "\033[0;3" << color << "m";
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#endif
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}
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static struct timespec diff_time(struct timespec &end, struct timespec &start)
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{
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struct timespec result;
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if (end.tv_nsec > start.tv_nsec) {
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result.tv_sec = end.tv_sec - start.tv_sec;
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result.tv_nsec = end.tv_nsec - start.tv_nsec;
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} else {
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result.tv_sec = end.tv_sec - start.tv_sec - 1;
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result.tv_nsec = NSEC_PER_SEC + end.tv_nsec - start.tv_nsec;
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}
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return result;
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}
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void print_instruction(const size_t rip, INSTRUX *instrux, const options &opts)
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{
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char instruxText[ND_MIN_BUF_SIZE];
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uint32_t k = 0;
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printf("%*zx ", opts.address_size, rip);
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if (!opts.no_color)
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{
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_set_text_color(Magenta);
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for (uint32_t idx = 0; idx < instrux->PrefLength; idx++, k++)
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{
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printf("%02x", instrux->InstructionBytes[k]);
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}
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_set_text_color(Green);
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for (uint32_t idx = 0; idx < (DWORD)(ND_IS_3DNOW(instrux) ? instrux->OpLength - 1 : instrux->OpLength); idx++, k++)
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{
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printf("%02x", instrux->InstructionBytes[k]);
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}
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_set_text_color(Yellow);
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for (uint32_t idx = 0; idx < (DWORD)(instrux->HasModRm + instrux->HasSib); idx++, k++)
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{
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printf("%02x", instrux->InstructionBytes[k]);
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}
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_set_text_color(Blue);
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for (uint32_t idx = 0; idx < (DWORD)(instrux->DispLength); idx++, k++)
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{
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printf("%02x", instrux->InstructionBytes[k]);
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}
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_set_text_color(Red);
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for (uint32_t idx = 0; idx < (DWORD)(instrux->Imm1Length + instrux->Imm2Length +
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instrux->RelOffsLength + instrux->MoffsetLength +
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instrux->HasSseImm + instrux->AddrLength); idx++, k++)
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{
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printf("%02x", instrux->InstructionBytes[k]);
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}
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if (ND_IS_3DNOW(instrux))
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{
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_set_text_color(Green);
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for (; k < instrux->Length; k++)
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{
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printf("%02x", instrux->InstructionBytes[k]);
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}
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}
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_set_text_color(Reset);
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}
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for (; k < instrux->Length; k++)
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{
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printf("%02x", instrux->InstructionBytes[k]);
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}
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std::cout << gSpaces[16 - instrux->Length];
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NdToText(instrux, rip, sizeof(instruxText), instruxText);
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std::cout << instruxText << std::endl;
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if (opts.extended) {
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const uint8_t opsize[3] = { 2, 4, 8 };
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const uint8_t adsize[3] = { 2, 4, 8 };
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const uint8_t veclen[3] = { 16, 32, 64 };
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printf(" DSIZE: %2d, ASIZE: %2d, VLEN: ",
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opsize[instrux->EfOpMode] * 8, adsize[instrux->AddrMode] * 8);
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if (ND_HAS_VECTOR(instrux)) {
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printf("%2d\n", veclen[instrux->VecMode] * 8);
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} else {
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printf("-\n");
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}
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printf(" ISA Set: %s, Ins cat: %s, Ins class: %d, CET tracked: %s\n",
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ins_set_to_str(instrux->IsaSet).c_str(), ins_cat_to_str(instrux->Category).c_str(), instrux->Instruction,
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instrux->IsCetTracked ? "yes" : "no");
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if (0 != instrux->CpuidFlag.Flag) {
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const char *regs[4] = { "eax", "ecx", "edx", "ebx" };
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printf(" CPUID leaf: 0x%08x", instrux->CpuidFlag.Leaf);
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if (instrux->CpuidFlag.SubLeaf != ND_CFF_NO_SUBLEAF)
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{
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printf(", sub-leaf: 0x%08x", instrux->CpuidFlag.SubLeaf);
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}
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printf(", reg: %s, bit %d\n", regs[instrux->CpuidFlag.Reg], instrux->CpuidFlag.Bit);
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}
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printf(" FLAGS access: ");
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uint32_t all = instrux->FlagsAccess.Tested.Raw | instrux->FlagsAccess.Modified.Raw | instrux->FlagsAccess.Set.Raw
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| instrux->FlagsAccess.Cleared.Raw | instrux->FlagsAccess.Undefined.Raw;
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const char *flags[22] = { "CF", nullptr, "PF", nullptr, "AF", nullptr, "ZF", "SF", "TF", "IF", "DF", "OF", "IOPL", nullptr, "NT", nullptr, "RF", "VM", "AC", "VIF", "VIP", "ID" };
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for (uint32_t fidx = 0; fidx < 21; fidx++) {
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if (flags[fidx] != nullptr) {
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if (0 == (all & (1ULL << fidx))) {
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continue;
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}
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printf("%s: ", flags[fidx]);
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if (instrux->FlagsAccess.Tested.Raw & (1ULL << fidx)) {
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printf("t");
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}
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if (instrux->FlagsAccess.Modified.Raw & (1ULL << fidx)) {
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printf("m");
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}
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if (instrux->FlagsAccess.Set.Raw & (1ULL << fidx)) {
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printf("1");
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}
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if (instrux->FlagsAccess.Cleared.Raw & (1ULL << fidx)) {
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printf("0");
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}
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if (instrux->FlagsAccess.Undefined.Raw & (1ULL << fidx)) {
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printf("u");
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}
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printf("; ");
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}
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}
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printf("\n");
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printf(" Valid modes: R0: %s, R1: %s, R2: %s, R3: %s, Real: %s, V8086: %s, Prot: %s, Compat: %s, Long: %s, SMM: %s, SGX: %s, TSX: %s, VMXRoot: %s, VMXNonRoot: %s\n",
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instrux->ValidModes.Ring0 ? "yes" : "no",
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instrux->ValidModes.Ring1 ? "yes" : "no",
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instrux->ValidModes.Ring2 ? "yes" : "no",
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instrux->ValidModes.Ring3 ? "yes" : "no",
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instrux->ValidModes.Real ? "yes" : "no",
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instrux->ValidModes.V8086 ? "yes" : "no",
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instrux->ValidModes.Protected ? "yes" : "no",
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instrux->ValidModes.Compat ? "yes" : "no",
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instrux->ValidModes.Long ? "yes" : "no",
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instrux->ValidModes.Smm ? "yes" : "no",
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instrux->ValidModes.Sgx ? "yes" : "no",
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instrux->ValidModes.Tsx ? "yes" : "no",
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instrux->ValidModes.VmxRoot ? "yes" : "no",
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instrux->ValidModes.VmxNonRoot ? "yes" : "no");
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for (uint8_t i = 0; i < instrux->OperandsCount; i++) {
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printf(" Operand %d %s Type: %10s, Size: %2d, RawSize: %2d, Encoding: %s", i,
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instrux->Operands[i].Access.Read && instrux->Operands[i].Access.Write ? "RW" :
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instrux->Operands[i].Access.Write ? "-W" : instrux->Operands[i].Access.Read ? "R-" : "--",
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op_type_to_str(instrux->Operands[i].Type).c_str(), instrux->Operands[i].Size,
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instrux->Operands[i].RawSize, op_enc_to_str(instrux->Operands[i].Encoding).c_str());
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if (ND_OP_MEM == instrux->Operands[i].Type) {
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printf(", ");
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if (instrux->Operands[i].Info.Memory.IsAG) {
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printf("Address Generator, ");
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}
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if (instrux->Operands[i].Info.Memory.IsBitbase) {
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printf("Bitbase Addressing, ");
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}
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if (instrux->Operands[i].Info.Memory.IsMib) {
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printf("MIB Addressing, ");
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}
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if (instrux->Operands[i].Info.Memory.IsVsib) {
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printf("VSIB Addressing, ");
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}
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if (instrux->Operands[i].Info.Memory.IsStack) {
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printf("Stack, ");
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}
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if (instrux->Operands[i].Info.Memory.IsShadowStack) {
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printf("Shadow Stack, ");
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}
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}
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if (ND_OP_REG == instrux->Operands[i].Type) {
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printf(", Type: %16s, Size: %2d, Reg: %d, Count: %d",
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reg_type_to_str(instrux->Operands[i].Info.Register.Type).c_str(),
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instrux->Operands[i].Info.Register.Size,
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instrux->Operands[i].Info.Register.Reg,
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instrux->Operands[i].Info.Register.Count);
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}
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printf("\n");
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if (instrux->Operands[i].Decorator.HasBroadcast) {
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printf(" Decorator: Broadcast %d bytes element %d times\n",
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instrux->Operands[i].Decorator.Broadcast.Size,
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instrux->Operands[i].Decorator.Broadcast.Count);
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}
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if (instrux->Operands[i].Decorator.HasMask) {
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printf(" Decorator: Mask k%d\n", instrux->Operands[i].Decorator.Mask.Msk);
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}
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if (instrux->Operands[i].Decorator.HasZero) {
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printf(" Decorator: Zero (no merging)\n");
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}
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}
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printf("\n");
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}
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}
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StringBuffer disassemble_one(uint8_t *bytes, size_t size, size_t rip, uint8_t bits, uint8_t vendor /* = ND_VEND_INTEL */)
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{
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INSTRUX instrux;
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auto status = NdDecodeEx2(&instrux, bytes, size, bits, bits, bits, vendor);
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if (!ND_SUCCESS(status))
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return byte_to_json(bytes[0], rip);
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else
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return instrux_to_json(&instrux, rip);
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}
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|
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size_t disassemble(options &opts)
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{
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struct timespec start;
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &start);
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size_t icount = 0, miss_count = 0, ibytes = 0;
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size_t rel_rip = opts.offset;
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size_t total_disasm = 0;
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auto bytes = opts.bytes.get();
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auto disasm_size = std::min(opts.actual_size - opts.offset, opts.size);
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opts.address_size = int(std::ceil(((8 * sizeof(opts.actual_size)) - __builtin_clzll(opts.actual_size)) / 4.0));
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while ((total_disasm < disasm_size) && (icount < opts.count)) {
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INSTRUX instrux;
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auto status = NdDecodeEx2(&instrux,
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&bytes[rel_rip],
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opts.actual_size - rel_rip,
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opts.bits,
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opts.bits,
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opts.bits,
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opts.vendor);
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|
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if (!ND_SUCCESS(status)) {
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if (!opts.dump_stats) {
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if (opts.json_output) {
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auto j = byte_to_json(bytes[rel_rip], rel_rip + opts.rip);
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std::cout << j.GetString() << std::endl;
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} else {
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printf("%*zx ", opts.address_size, rel_rip + opts.rip);
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printf("%02x", bytes[rel_rip]);
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printf("%s", gSpaces[16 - opts.address_size]);
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printf("db 0x%02x\n", bytes[rel_rip]);
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}
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}
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rel_rip++;
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total_disasm++;
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|
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miss_count++;
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} else {
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icount++;
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ibytes += instrux.Length;
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|
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if (!opts.dump_stats) {
|
|
if (opts.json_output) {
|
|
auto j = instrux_to_json(&instrux, rel_rip + opts.rip);
|
|
std::cout << j.GetString() << std::endl;
|
|
} else
|
|
print_instruction(rel_rip + opts.rip, &instrux, opts);
|
|
} else if (opts.json_output)
|
|
instrux_to_json(&instrux, rel_rip + opts.rip);
|
|
|
|
rel_rip += instrux.Length;
|
|
total_disasm += instrux.Length;
|
|
}
|
|
}
|
|
|
|
struct timespec end;
|
|
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end);
|
|
|
|
if (opts.dump_stats)
|
|
{
|
|
auto result = diff_time(end, start);
|
|
|
|
long total_ns = result.tv_sec * NSEC_PER_SEC + result.tv_nsec;
|
|
|
|
printf("Disassembled %zu instructions took %ld.%09ld seconds, %ld ns / instr.\n",
|
|
icount, result.tv_sec, result.tv_nsec, total_ns / icount);
|
|
printf("Invalid: %zu/%zu (%.2f) bytes\n", miss_count, ibytes,
|
|
(static_cast<double>(miss_count) / static_cast<double>(disasm_size)) * 100.0);
|
|
}
|
|
|
|
opts.rip += rel_rip;
|
|
|
|
return icount;
|
|
}
|
|
|
|
|
|
static bool _validate_and_fix_args(options& opts)
|
|
{
|
|
if (!opts.interactive && !opts.comm) {
|
|
int total = 0;
|
|
|
|
if (!opts.hex_string.empty())
|
|
total++;
|
|
|
|
if (!opts.hex_file.empty())
|
|
total++;
|
|
|
|
if (!opts.in_file.empty())
|
|
total++;
|
|
|
|
if (total == 0) {
|
|
std::cerr << "Give hex, file or hex-file..." << std::endl;
|
|
return false;
|
|
} else if (total > 1) {
|
|
std::cerr << "Only one of hex, file or hex-file can be present..." << std::endl;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (opts.interactive || opts.comm) {
|
|
if (!opts.in_file.empty() || !opts.hex_string.empty() || !opts.hex_file.empty()) {
|
|
std::cerr << "Interactive mode doesn't work with file, hex-string or hex-file" << std::endl;
|
|
return false;
|
|
}
|
|
|
|
if (opts.size || opts.count || opts.offset) {
|
|
std::cerr << "Interactive mode doesn't work with size, count or offset" << std::endl;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
switch (opts.bits) {
|
|
case 64:
|
|
opts.bits = ND_DATA_64;
|
|
break;
|
|
|
|
case 32:
|
|
opts.bits = ND_DATA_32;
|
|
break;
|
|
|
|
case 16:
|
|
opts.bits = ND_DATA_16;
|
|
break;
|
|
|
|
default:
|
|
std::cerr << "Please give --bits [64,32,16]" << std::endl;
|
|
return false;
|
|
}
|
|
|
|
if (0 == opts.size)
|
|
opts.size = std::numeric_limits<std::size_t>::max();
|
|
|
|
if (0 == opts.count)
|
|
opts.count = std::numeric_limits<std::size_t>::max();
|
|
|
|
if (!isatty(fileno(stdout)))
|
|
opts.output_redirected = true;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
static size_t _get_hex_opt(argparse::ArgumentParser &parser, const std::string &field)
|
|
{
|
|
return std::strtoul(parser.get<std::string>(field).c_str(), nullptr, 0);
|
|
}
|
|
|
|
|
|
int main(int argc, const char **argv)
|
|
{
|
|
auto opts = options{};
|
|
|
|
auto parser = argparse::ArgumentParser(argv[0], "Disassembler tool for Linux");
|
|
|
|
parser.add_argument("-i", "--interactive", "Interactive mode", false);
|
|
parser.add_argument("-c", "--comm", "Comm mode", false);
|
|
parser.add_argument("-r", "--rip", "Use this rip to disassemble", false);
|
|
parser.add_argument("-f", "--file", "Use this input file", false);
|
|
parser.add_argument("-x", "--hex", "Use this hex-string", false);
|
|
parser.add_argument("--hexfile", "Use this input file as a hex-string", false);
|
|
parser.add_argument("--no-color", "Don't use colors", false);
|
|
parser.add_argument("--offset", "Use this offset in file/hex-string", false);
|
|
parser.add_argument("--size", "Only disasemble this size from file/hex-string", false);
|
|
parser.add_argument("--count", "Only disasemble this many instructions", false);
|
|
parser.add_argument("--stats", "Dump statistics (time, count, etc.)", false);
|
|
parser.add_argument("-b", "--bits", "Use the arch [16, 32, 64]", false);
|
|
parser.add_argument("--verbose", "Verbose mode", false);
|
|
parser.add_argument("--json", "Output to json", false);
|
|
parser.add_argument("--extended", "Extended instruction info", false);
|
|
|
|
parser.enable_help();
|
|
|
|
auto err = parser.parse(argc, argv);
|
|
if (err) {
|
|
std::cout << err << std::endl;
|
|
return -1;
|
|
}
|
|
|
|
if (parser.exists("help")) {
|
|
parser.print_help();
|
|
return 0;
|
|
}
|
|
|
|
opts.bits = parser.get<uint64_t>("bits");
|
|
opts.interactive = parser.exists("interactive");
|
|
opts.comm = parser.exists("comm");
|
|
opts.offset = _get_hex_opt(parser, "offset");
|
|
opts.size = _get_hex_opt(parser, "size");
|
|
opts.count = _get_hex_opt(parser, "count");
|
|
opts.rip = _get_hex_opt(parser, "rip");
|
|
opts.in_file = parser.get<std::string>("file");
|
|
opts.hex_string = parser.get<std::string>("hex");
|
|
opts.hex_file = parser.get<std::string>("hexfile");
|
|
opts.no_color = parser.exists("no-color");
|
|
opts.dump_stats = parser.exists("stats");
|
|
opts.verbose = parser.exists("verbose");
|
|
opts.json_output = parser.exists("json");
|
|
opts.extended = parser.exists("extended");
|
|
|
|
if (opts.verbose) {
|
|
std::cout << "interactive: " << opts.interactive << std::endl;
|
|
std::cout << "comm: " << opts.comm << std::endl;
|
|
std::cout << "rip: " << opts.rip << std::endl;
|
|
std::cout << "bits: " << static_cast<uint16_t>(opts.bits) << std::endl;
|
|
std::cout << "offset: " << opts.offset << std::endl;
|
|
std::cout << "size: " << opts.offset << std::endl;
|
|
std::cout << "count: " << opts.count << std::endl;
|
|
std::cout << "in_file: " << opts.in_file << std::endl;
|
|
std::cout << "no-color: " << opts.no_color << std::endl;
|
|
std::cout << "stats: " << opts.dump_stats << std::endl;
|
|
std::cout << "hex: " << opts.hex_string << std::endl;
|
|
std::cout << "json: " << opts.json_output << std::endl;
|
|
std::cout << "extended: " << opts.extended << std::endl;
|
|
}
|
|
|
|
if (!_validate_and_fix_args(opts)) {
|
|
return 1;
|
|
}
|
|
|
|
if (!opts.interactive && !opts.comm) {
|
|
if (!opts.hex_string.empty() || !opts.hex_file.empty()) {
|
|
if (!_hexstring_to_bytes(opts))
|
|
return 1;
|
|
} else if (!opts.in_file.empty()) {
|
|
if (!_file_to_bytes(opts))
|
|
return 1;
|
|
}
|
|
|
|
if (opts.offset >= opts.actual_size)
|
|
return 1;
|
|
|
|
disassemble(opts);
|
|
} else {
|
|
while (true) {
|
|
opts.hex_string.clear();
|
|
|
|
if (!opts.comm)
|
|
std::cout << ">> ";
|
|
|
|
std::getline(std::cin, opts.hex_string);
|
|
|
|
if (opts.hex_string == "q"
|
|
|| opts.hex_string == "quit"
|
|
|| opts.hex_string == "exit"
|
|
|| opts.hex_string.empty()) {
|
|
|
|
if (!opts.comm)
|
|
std::cout << "Bye!" << std::endl;
|
|
|
|
break;
|
|
}
|
|
|
|
_hexstring_to_bytes(opts);
|
|
|
|
disassemble(opts);
|
|
|
|
std::cout.flush();
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|