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-/* Unzcrash - Tests robustness of decompressors to corrupted data.
- Inspired by unzcrash.c from Julian Seward's bzip2.
- Copyright (C) 2008-2014 Antonio Diaz Diaz.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-/*
- Exit status: 0 for a normal exit, 1 for environmental problems
- (file not found, invalid flags, I/O errors, etc), 2 to indicate a
- corrupt or invalid input file, 3 for an internal consistency error
- (eg, bug) which caused unzcrash to panic.
-*/
-
-#include <cerrno>
-#include <climits>
-#include <csignal>
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
-#include <string>
-#include <vector>
-#include <stdint.h>
-#include <unistd.h>
-
-#include "../arg_parser.h"
-
-#if CHAR_BIT != 8
-#error "Environments where CHAR_BIT != 8 are not supported."
-#endif
-
-
-namespace {
-
-const char * const Program_name = "Unzcrash";
-const char * const program_name = "unzcrash";
-const char * const program_year = "2014";
-const char * invocation_name = 0;
-
-int verbosity = 0;
-
-
-void show_help()
- {
- std::printf( "%s - Tests robustness of decompressors to corrupted data.\n", Program_name );
- std::printf( "\nUsage: %s [options] \"lzip -tv\" filename.lz\n", invocation_name );
- std::printf( "\nThis program reads the specified file and then repeatedly decompresses\n"
- "it, increasing 256 times each byte of the compressed data, so as to test\n"
- "all possible one-byte errors. This should not cause any invalid memory\n"
- "accesses. If it does, please, report it as a bug.\n"
- "\nOptions:\n"
- " -h, --help display this help and exit\n"
- " -V, --version output version information and exit\n"
- " -b, --bits=<range> test N-bit errors instead of full byte\n"
- " -p, --position=<bytes> first byte position to test [default 0]\n"
- " -q, --quiet suppress all messages\n"
- " -s, --size=<bytes> number of byte positions to test [all]\n"
- " -v, --verbose be verbose (a 2nd -v gives more)\n"
- "Examples of <range>: 1 1,2,3 1-4 1,3-5,8 1-3,5-8\n"
- "\nExit status: 0 for a normal exit, 1 for environmental problems (file\n"
- "not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or\n"
- "invalid input file, 3 for an internal consistency error (eg, bug) which\n"
- "caused unzcrash to panic.\n"
- "\nReport bugs to lzip-bug@nongnu.org\n"
- "Lziprecover home page: http://www.nongnu.org/lzip/lziprecover.html\n" );
- }
-
-
-void show_version()
- {
- std::printf( "%s %s\n", program_name, PROGVERSION );
- std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
- std::printf( "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
- "This is free software: you are free to change and redistribute it.\n"
- "There is NO WARRANTY, to the extent permitted by law.\n" );
- }
-
-
-void show_error( const char * const msg, const int errcode = 0,
- const bool help = false )
- {
- if( verbosity >= 0 )
- {
- if( msg && msg[0] )
- {
- std::fprintf( stderr, "%s: %s", program_name, msg );
- if( errcode > 0 )
- std::fprintf( stderr, ": %s", std::strerror( errcode ) );
- std::fprintf( stderr, "\n" );
- }
- if( help )
- std::fprintf( stderr, "Try '%s --help' for more information.\n",
- invocation_name );
- }
- }
-
-
-void internal_error( const char * const msg )
- {
- if( verbosity >= 0 )
- std::fprintf( stderr, "%s: internal error: %s\n", program_name, msg );
- std::exit( 3 );
- }
-
-
-unsigned long long getnum( const char * const ptr,
- const unsigned long long llimit,
- const unsigned long long ulimit )
- {
- char * tail;
- errno = 0;
- unsigned long long result = strtoull( ptr, &tail, 0 );
- if( tail == ptr )
- {
- show_error( "Bad or missing numerical argument.", 0, true );
- std::exit( 1 );
- }
-
- if( !errno && tail[0] )
- {
- int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
- int exponent = 0;
- bool bad_multiplier = false;
- switch( tail[0] )
- {
- case ' ': break;
- case 'Y': exponent = 8; break;
- case 'Z': exponent = 7; break;
- case 'E': exponent = 6; break;
- case 'P': exponent = 5; break;
- case 'T': exponent = 4; break;
- case 'G': exponent = 3; break;
- case 'M': exponent = 2; break;
- case 'K': if( factor == 1024 ) exponent = 1; else bad_multiplier = true;
- break;
- case 'k': if( factor == 1000 ) exponent = 1; else bad_multiplier = true;
- break;
- default : bad_multiplier = true;
- }
- if( bad_multiplier )
- {
- show_error( "Bad multiplier in numerical argument.", 0, true );
- std::exit( 1 );
- }
- for( int i = 0; i < exponent; ++i )
- {
- if( ulimit / factor >= result ) result *= factor;
- else { errno = ERANGE; break; }
- }
- }
- if( !errno && ( result < llimit || result > ulimit ) ) errno = ERANGE;
- if( errno )
- {
- show_error( "Numerical argument out of limits." );
- std::exit( 1 );
- }
- return result;
- }
-
-
-class Bitset8 // 8 value bitset (1 to 8)
- {
- bool data[8];
- static bool valid_digit( const unsigned char ch )
- { return ( ch >= '1' && ch <= '8' ); }
-
-public:
- Bitset8() { for( int i = 0; i < 8; ++i ) data[i] = true; }
-
- bool includes( const int i ) const
- { return ( i >= 1 && i <= 8 && data[i-1] ); }
-
- // Recognized formats: 1 1,2,3 1-4 1,3-5,8 1-3,5-8
- bool parse( const char * p )
- {
- for( int i = 0; i < 8; ++i ) data[i] = false;
- while( true )
- {
- const unsigned char ch1 = *p++;
- if( !valid_digit( ch1 ) ) break;
- if( *p != '-' ) data[ch1-'1'] = true;
- else
- {
- ++p;
- if( !valid_digit( *p ) || ch1 > *p ) break;
- for( int c = ch1; c <= *p; ++c ) data[c-'1'] = true;
- ++p;
- }
- if( *p == 0 ) return true;
- if( *p == ',' ) ++p; else break;
- }
- show_error( "Invalid value or range." );
- return false;
- }
-
- // number of N-bit errors per byte (N=0 to 8): 1 8 28 56 70 56 28 8 1
- void print() const
- {
- std::fflush( stderr );
- int c = 0;
- for( int i = 0; i < 8; ++i ) if( data[i] ) ++c;
- if( c == 8 ) std::printf( "Testing full byte.\n" );
- else if( c == 0 ) std::printf( "Nothing to test.\n" );
- else
- {
- std::printf( "Testing " );
- for( int i = 0; i < 8; ++i )
- if( data[i] )
- {
- std::printf( "%d", i + 1 );
- if( --c ) std::printf( "," );
- }
- std::printf( " bit errors.\n" );
- }
- std::fflush( stdout );
- }
- };
-
-
-int differing_bits( const uint8_t byte1, const uint8_t byte2 )
- {
- int count = 0;
- uint8_t dif = byte1 ^ byte2;
- while( dif )
- { count += ( dif & 1 ); dif >>= 1; }
- return count;
- }
-
-} // end namespace
-
-
-int main( const int argc, const char * const argv[] )
- {
- enum { buffer_size = 3 << 20 };
- Bitset8 bits; // if Bitset8::parse not called test full byte
- int pos = 0;
- int max_size = buffer_size;
- invocation_name = argv[0];
-
- const Arg_parser::Option options[] =
- {
- { 'h', "help", Arg_parser::no },
- { 'b', "bits", Arg_parser::yes },
- { 'p', "position", Arg_parser::yes },
- { 'q', "quiet", Arg_parser::no },
- { 's', "size", Arg_parser::yes },
- { 'v', "verbose", Arg_parser::no },
- { 'V', "version", Arg_parser::no },
- { 0 , 0, Arg_parser::no } };
-
- const Arg_parser parser( argc, argv, options );
- if( parser.error().size() ) // bad option
- { show_error( parser.error().c_str(), 0, true ); return 1; }
-
- int argind = 0;
- for( ; argind < parser.arguments(); ++argind )
- {
- const int code = parser.code( argind );
- if( !code ) break; // no more options
- const char * const arg = parser.argument( argind ).c_str();
- switch( code )
- {
- case 'h': show_help(); return 0;
- case 'b': if( !bits.parse( arg ) ) return 1; break;
- case 'p': pos = getnum( arg, 0, buffer_size - 1 ); break;
- case 'q': verbosity = -1; break;
- case 's': max_size = getnum( arg, 1, buffer_size ); break;
- case 'v': if( verbosity < 4 ) ++verbosity; break;
- case 'V': show_version(); return 0;
- default : internal_error( "uncaught option." );
- }
- } // end process options
-
- if( argind + 2 != parser.arguments() )
- {
- if( verbosity >= 0 )
- std::fprintf( stderr, "Usage: %s \"lzip -tv\" filename.lz\n",
- invocation_name );
- return 1;
- }
-
- FILE *f = std::fopen( parser.argument( argind + 1 ).c_str(), "rb" );
- if( !f )
- {
- if( verbosity >= 0 )
- std::fprintf( stderr, "Can't open file '%s' for reading\n",
- parser.argument( argind + 1 ).c_str() );
- return 1;
- }
-
- uint8_t * const buffer = new uint8_t[buffer_size];
- const int size = std::fread( buffer, 1, buffer_size, f );
- if( size >= buffer_size )
- {
- if( verbosity >= 0 )
- std::fprintf( stderr, "input file '%s' is too large.\n",
- parser.argument( argind + 1 ).c_str() );
- return 2;
- }
- std::fclose( f );
-
- f = popen( parser.argument( argind ).c_str(), "w" );
- if( !f )
- { show_error( "Can't open pipe", errno ); return 1; }
- const int wr = std::fwrite( buffer, 1, size, f );
- if( wr != size || pclose( f ) != 0 )
- {
- if( verbosity >= 0 )
- std::fprintf( stderr, "Could not run '%s' : %s.\n",
- parser.argument( argind ).c_str(), std::strerror( errno ) );
- return 1;
- }
-
- std::signal( SIGPIPE, SIG_IGN );
- if( verbosity >= 1 ) bits.print();
-
- const int end = ( ( pos + max_size < size ) ? pos + max_size : size );
- for( int i = pos; i < end; ++i )
- {
- if( verbosity >= 0 )
- std::fprintf( stderr, "byte %d\n", i );
- const uint8_t byte = buffer[i];
- for( int j = 0; j < 255; ++j )
- {
- ++buffer[i];
- if( bits.includes( differing_bits( byte, buffer[i] ) ) )
- {
- f = popen( parser.argument( argind ).c_str(), "w" );
- if( !f )
- { show_error( "Can't open pipe", errno ); return 1; }
- std::fwrite( buffer, 1, size, f );
- if( pclose( f ) == 0 && verbosity >= 0 )
- std::fprintf( stderr, "0x%02X (0x%02X+0x%02X) passed the test\n",
- buffer[i], byte, j + 1 );
- }
- }
- buffer[i] = byte;
- }
-
- delete[] buffer;
- return 0;
- }
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