mirror of
https://github.com/serge1/ELFIO.git
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103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
/*
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anonymizer.cpp - Overwrites string table for a function name.
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Copyright (C) 2017 by Martin Bickel
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Copyright (C) 2020 by Serge Lamikhov-Center
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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/*
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To run the example, you may use the following script:
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#!/usr/bin/bash
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make
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cp anonymizer temp.elf
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readelf -a temp.elf > before.txt
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./anonymizer temp.elf
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readelf -a temp.elf > after.txt
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diff before.txt after.txt
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*/
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#ifdef _MSC_VER
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#define _SCL_SECURE_NO_WARNINGS
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#define ELFIO_NO_INTTYPES
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#endif
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#include <string>
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#include <iostream>
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#include <fstream>
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#include <elfio/elfio.hpp>
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using namespace ELFIO;
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void overwrite_data( const std::string& filename,
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Elf64_Off offset,
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const std::string& str )
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{
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std::ofstream file( filename,
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std::ios::in | std::ios::out | std::ios::binary );
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if ( !file )
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throw "Error opening file" + filename;
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std::string data( str.length(), '-' );
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file.seekp( (std::streampos)offset );
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file.write( data.c_str(), data.length() + 1 );
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}
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void process_string_table( const section* s, const std::string& filename )
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{
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std::cout << "Info: processing string table section" << std::endl;
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size_t index = 1;
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while ( index < s->get_size() ) {
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auto str = std::string( s->get_data() + index );
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// For the example purpose, we rename main function name only
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if ( str == "main" )
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overwrite_data( filename, s->get_offset() + index, str );
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index += str.length() + 1;
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}
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}
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int main( int argc, char** argv )
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{
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if ( argc != 2 ) {
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std::cout << "Usage: anonymizer <file_name>\n";
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return 1;
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}
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std::string filename = argv[1];
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elfio reader;
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if ( !reader.load( filename ) ) {
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std::cerr << "File " << filename
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<< " is not found or it is not an ELF file\n";
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return 1;
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}
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for ( const auto& section : reader.sections ) {
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if ( section->get_type() == SHT_STRTAB &&
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std::string( section->get_name() ) == std::string( ".strtab" ) ) {
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process_string_table( section.get(), filename );
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}
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}
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return 0;
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}
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