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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "mcpu-archive.h"
#include "mcpu-melf.h"
#include "mcpu-object-edit.h"
#include "mcpu-version.h"
static void
usage( FILE *fp, const char *name )
{
fprintf( fp,
"usage: %s [options] MELF-file\n\n"
"Strip non-runtime symbol metadata from LibMCPU MELF files and archives.\n\n"
"The current safe policy removes ordinary SHT_SYMTAB/SHT_STRTAB metadata\n"
"from ET_EXEC/ET_DYN only when no retained section depends on it. ET_REL\n"
"symbol tables, dynamic-linking tables, relocations and MCPU metadata are\n"
"always preserved.\n\n"
"Options:\n"
" -o, --output=FILE - write result to FILE instead of replacing input\n"
" --help - show this help\n"
" --version - show program version\n"
" --dump-version - show version number only\n",
name );
} /* End of usage() */
static int
make_temp_name( const char *path, char **name, char *err, size_t errsz )
{
size_t n = strlen( path );
char *p;
if( n > SIZE_MAX - 32 )
{
snprintf( err, errsz, "output path is too long" );
return( -1 );
}
p = (char *)malloc( n + 32 );
if( !p )
{
snprintf( err, errsz, "out of memory" );
return( -1 );
}
snprintf( p, n + 32, "%s.mcpu-strip-XXXXXX", path );
*name = p;
return( 0 );
} /* End of make_temp_name() */
static int
commit_bytes( const char *input, const char *output,
const unsigned char *data, size_t size,
char *err, size_t errsz )
{
struct stat st;
char *tmp = NULL;
int fd = -1;
int rc = -1;
if( stat( input, &st ) )
{
snprintf( err, errsz, "%s: %s", input, strerror( errno ) );
return( -1 );
}
if( make_temp_name( output, &tmp, err, errsz ) )
return( -1 );
fd = mkstemp( tmp );
if( fd < 0 )
{
snprintf( err, errsz, "%s: %s", tmp, strerror( errno ) );
goto out;
}
if( close( fd ) )
{
fd = -1;
snprintf( err, errsz, "%s: %s", tmp, strerror( errno ) );
goto out;
}
fd = -1;
if( cpu_melf_writeall( tmp, data, size, err, errsz ) )
goto out;
if( chmod( tmp, st.st_mode & 07777 ) )
{
snprintf( err, errsz, "%s: %s", tmp, strerror( errno ) );
goto out;
}
if( rename( tmp, output ) )
{
snprintf( err, errsz, "%s: %s", output, strerror( errno ) );
goto out;
}
rc = 0;
out:
if( fd >= 0 )
close( fd );
if( rc && tmp )
unlink( tmp );
free( tmp );
return( rc );
} /* End of commit_bytes() */
static int
commit_archive( const char *input, const char *output,
const mcpu_archive *archive, int index,
char *err, size_t errsz )
{
struct stat st;
char *tmp = NULL;
int fd = -1;
int rc = -1;
if( stat( input, &st ) )
{
snprintf( err, errsz, "%s: %s", input, strerror( errno ) );
return( -1 );
}
if( make_temp_name( output, &tmp, err, errsz ) )
return( -1 );
fd = mkstemp( tmp );
if( fd < 0 )
{
snprintf( err, errsz, "%s: %s", tmp, strerror( errno ) );
goto out;
}
if( close( fd ) )
{
fd = -1;
snprintf( err, errsz, "%s: %s", tmp, strerror( errno ) );
goto out;
}
fd = -1;
if( mcpu_archive_write( tmp, archive, index, err, errsz ) )
goto out;
if( chmod( tmp, st.st_mode & 07777 ) )
{
snprintf( err, errsz, "%s: %s", tmp, strerror( errno ) );
goto out;
}
if( rename( tmp, output ) )
{
snprintf( err, errsz, "%s: %s", output, strerror( errno ) );
goto out;
}
rc = 0;
out:
if( fd >= 0 )
close( fd );
if( rc && tmp )
unlink( tmp );
free( tmp );
return( rc );
} /* End of commit_archive() */
static int
strip_archive( const char *input, const char *output,
const unsigned char *original, size_t original_size,
char *err, size_t errsz )
{
mcpu_archive archive;
size_t i;
int any = 0;
int rc = -1;
mcpu_archive_init( &archive );
if( mcpu_archive_read( input, &archive, err, errsz ) )
return( -1 );
for( i = 0; i < archive.member_count; ++i )
{
unsigned char *p = NULL;
size_t n = 0;
int changed = 0;
if( mcpu_object_strip_data( archive.members[i].data,
archive.members[i].size,
&p, &n, &changed, err, errsz ) )
goto out;
if( changed )
{
free( archive.members[i].data );
archive.members[i].data = p;
archive.members[i].size = n;
any = 1;
}
else
free( p );
}
if( !any )
rc = commit_bytes( input, output, original, original_size, err, errsz );
else
rc = commit_archive( input, output, &archive, archive.had_symbol_index,
err, errsz );
out:
mcpu_archive_free( &archive );
return( rc );
} /* End of strip_archive() */
int
main( int argc, char **argv )
{
const char *prog = argv[0];
const char *input = NULL;
const char *output = NULL;
unsigned char *data = NULL;
size_t size = 0;
int i;
char err[512];
int rc = EXIT_FAILURE;
for( i = 1; i < argc; ++i )
{
const char *arg = argv[i];
if( !strcmp( arg, "--help" ) )
{
usage( stdout, prog );
return( EXIT_SUCCESS );
}
if( !strcmp( arg, "--version" ) ||
!strcmp( arg, "--dump-version" ) )
{
mcpu_version_action version_action;
mcpu_version_parse_option( arg, &version_action );
return( mcpu_version_print(prog, version_action) == 0 ?
EXIT_SUCCESS : EXIT_FAILURE );
}
if( !strcmp( arg, "-o" ) )
{
if( ++i >= argc || output )
{
usage( stderr, prog );
return( EXIT_FAILURE );
}
output = argv[i];
continue;
}
if( !strncmp( arg, "--output=", 9 ) )
{
if( output || !arg[9] )
{
usage( stderr, prog );
return( EXIT_FAILURE );
}
output = arg + 9;
continue;
}
if( arg[0] == '-' && arg[1] )
{
fprintf( stderr, "%s: unknown option: %s\n", prog, arg );
usage( stderr, prog );
return( EXIT_FAILURE );
}
if( input )
{
fprintf( stderr, "%s: exactly one input file is required\n", prog );
usage( stderr, prog );
return( EXIT_FAILURE );
}
input = arg;
}
if( !input )
{
usage( stderr, prog );
return( EXIT_FAILURE );
}
if( !output )
output = input;
if( cpu_melf_readall( input, &data, &size, err, sizeof( err ) ) )
{
fprintf( stderr, "%s: %s\n", prog, err );
return( EXIT_FAILURE );
}
if( size >= 8 && !memcmp( data, "!<arch>\n", 8 ) )
{
if( strip_archive( input, output, data, size, err, sizeof( err ) ) )
fprintf( stderr, "%s: %s: %s\n", prog, input, err );
else
rc = EXIT_SUCCESS;
}
else
{
unsigned char *stripped = NULL;
size_t stripped_size = 0;
int changed = 0;
if( mcpu_object_strip_data( data, size, &stripped, &stripped_size,
&changed, err, sizeof( err ) ) )
fprintf( stderr, "%s: %s: %s\n", prog, input, err );
else if( commit_bytes( input, output, stripped, stripped_size,
err, sizeof( err ) ) )
fprintf( stderr, "%s: %s\n", prog, err );
else
rc = EXIT_SUCCESS;
free( stripped );
(void)changed;
}
free( data );
return( rc );
} /* End of main() */
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