/*************************************************************************** * binoffset.c * (C) 2002 Randy Dunlap <rddunlap@osdl.org> #   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, write to the Free Software#   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. # binoffset.c:# - searches a (binary) file for a specified (binary) pattern# - returns the offset of the located pattern or ~0 if not found# - exits with exit status 0 normally or non-0 if pattern is not found#   or any other error occurs. ****************************************************************/ #include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <unistd.h>#include <fcntl.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/mman.h> #define VERSION		"0.1"#define BUF_SIZE	(16 * 1024)#define PAT_SIZE	100 char		*progname;char		*inputname;int		inputfd;unsigned int	bix;			/* buf index */unsigned char	patterns [PAT_SIZE] = {0}; /* byte-sized pattern array */int		pat_len;		/* actual number of pattern bytes */unsigned char	*madr;			/* mmap address */size_t		filesize;int		num_matches = 0;off_t		firstloc = 0; void usage (void){	fprintf (stderr, "%s ver. %s\n", progname, VERSION);	fprintf (stderr, "usage:  %s filename pattern_bytes\n",			progname);	fprintf (stderr, "        [prints location of pattern_bytes in file]\n");	exit (1);} void get_pattern (int pat_count, char *pats []){	int ix, err, tmp; #ifdef DEBUG	fprintf (stderr,"get_pattern: count = %d\n", pat_count);	for (ix = 0; ix < pat_count; ix++)		fprintf (stderr, "  pat # %d:  [%s]\n", ix, pats[ix]);#endif 	for (ix = 0; ix < pat_count; ix++) {		tmp = 0;		err = sscanf (pats[ix], "%5i", &tmp);		if (err != 1 || tmp > 0xff) {			fprintf (stderr, "pattern or value error in pattern # %d [%s]\n",					ix, pats[ix]);			usage ();		}		patterns [ix] = tmp;	}	pat_len = pat_count;} void search_pattern (void){	for (bix = 0; bix < filesize; bix++) {		if (madr[bix] == patterns[0]) {			if (memcmp (&madr[bix], patterns, pat_len) == 0) {				if (num_matches == 0)					firstloc = bix;				num_matches++;			}		}	}} #ifdef NOTDEFsize_t get_filesize (int fd){	off_t end_off = lseek (fd, 0, SEEK_END);	lseek (fd, 0, SEEK_SET);	return (size_t) end_off;}#endif size_t get_filesize (int fd){	int err;	struct stat stat; 	err = fstat (fd, &stat);	fprintf (stderr, "filesize: %ld\n", err < 0 ? (long)err : stat.st_size);	if (err < 0)		return err;	return (size_t) stat.st_size;} int main (int argc, char *argv []){	progname = argv[0]; 	if (argc < 3)		usage (); 	get_pattern (argc - 2, argv + 2); 	inputname = argv[1]; 	inputfd = open (inputname, O_RDONLY);	if (inputfd == -1) {		fprintf (stderr, "%s: cannot open '%s'\n",				progname, inputname);		exit (3);	} 	filesize = get_filesize (inputfd); 	madr = mmap (0, filesize, PROT_READ, MAP_PRIVATE, inputfd, 0);	if (madr == MAP_FAILED) {		fprintf (stderr, "mmap error = %d\n", errno);		close (inputfd);		exit (4);	} 	search_pattern (); 	if (munmap (madr, filesize))		fprintf (stderr, "munmap error = %d\n", errno); 	if (close (inputfd))		fprintf (stderr, "%s: error %d closing '%s'\n",				progname, errno, inputname); 	fprintf (stderr, "number of pattern matches = %d\n", num_matches);	if (num_matches == 0)		firstloc = ~0;	printf ("%ld\n", firstloc);	fprintf (stderr, "%ld\n", firstloc); 	exit (num_matches ? 0 : 2);} /* end binoffset.c */