brandelf.c revision 18962
152419Sjulian/*- 252419Sjulian * Copyright (c) 1996 S�ren Schmidt 352419Sjulian * All rights reserved. 452419Sjulian * 552419Sjulian * Redistribution and use in source and binary forms, with or without 670700Sjulian * modification, are permitted provided that the following conditions 752419Sjulian * are met: 852419Sjulian * 1. Redistributions of source code must retain the above copyright 952419Sjulian * notice, this list of conditions and the following disclaimer 1052419Sjulian * in this position and unchanged. 1152419Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1252419Sjulian * notice, this list of conditions and the following disclaimer in the 1352419Sjulian * documentation and/or other materials provided with the distribution. 1452419Sjulian * 3. The name of the author may not be used to endorse or promote products 1552419Sjulian * derived from this software withough specific prior written permission 1652419Sjulian * 1770700Sjulian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1852419Sjulian * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1952419Sjulian * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2052419Sjulian * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2152419Sjulian * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2252419Sjulian * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2352419Sjulian * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2452419Sjulian * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2552419Sjulian * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2652419Sjulian * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2752419Sjulian * 2852419Sjulian * $Id$ 2952419Sjulian */ 3052419Sjulian 3152419Sjulian#include <stdlib.h> 3252419Sjulian#include <stdio.h> 3352419Sjulian#include <fcntl.h> 3452419Sjulian#include <sys/imgact_elf.h> 3552419Sjulian 3667506Sjulianint usage(); 3767506Sjulian 3852419Sjulianmain(int argc, char **argv) 3952419Sjulian{ 4052419Sjulian extern char *optarg; 4152419Sjulian extern int optind; 4252419Sjulian 4352419Sjulian char type[10] = "FreeBSD"; 4452419Sjulian int ch, change = 0, verbose = 0; 4552419Sjulian 4652419Sjulian while ((ch = getopt(argc, argv, "t:v")) != EOF) 4752419Sjulian switch (ch) { 4852419Sjulian case 'v': 4952419Sjulian verbose = 1; 5052419Sjulian break; 5152419Sjulian case 't': 5252419Sjulian change = 1; 5370700Sjulian strcpy(type, optarg); 5452419Sjulian break; 5552419Sjulian default: 5652419Sjulian usage(); 5752843Sphk } 5852816Sarchie argc -= optind; 5952419Sjulian argv += optind; 6052419Sjulian if (!argc) { 6152419Sjulian fprintf(stderr, "No file(s) specified.\n"); 6252419Sjulian exit(1); 6352419Sjulian } 6453913Sarchie while (argc) { 6552419Sjulian int fd; 6659756Speter char buffer[EI_NINDENT]; 6759756Speter char string[(EI_NINDENT-EI_SPARE)+1]; 6870784Sjulian 6970700Sjulian if ((fd = open(argv[0], O_RDWR, 0)) < 0) { 7070700Sjulian fprintf(stderr, "No such file %s.\n", argv[0]); 7152419Sjulian goto fail; 7270784Sjulian 7370784Sjulian } 7470784Sjulian if (read(fd, buffer, EI_NINDENT) < EI_NINDENT) { 7570784Sjulian fprintf(stderr, "File '%s' too short.\n", argv[0]); 7670784Sjulian goto fail; 7770784Sjulian } 7870784Sjulian if (buffer[0] != ELFMAG0 || buffer[1] != ELFMAG1 || 7970784Sjulian buffer[2] != ELFMAG2 || buffer[3] != ELFMAG3) { 8070784Sjulian fprintf(stderr, "File '%s' is not ELF format.\n", 8170784Sjulian argv[0]); 8270784Sjulian goto fail; 8370784Sjulian } 8470784Sjulian if (!change) { 8570700Sjulian bzero(string, sizeof(string)); 8670700Sjulian strncpy(string, &buffer[EI_SPARE], EI_NINDENT-EI_SPARE); 8770700Sjulian if (strlen(string)) { 8870700Sjulian fprintf(stdout, "File '%s' is of brand '%s'.\n", 8952419Sjulian argv[0], string); 9070700Sjulian } 9170700Sjulian else 9252419Sjulian fprintf(stdout, "File '%s' has no branding.\n", 9370700Sjulian argv[0]); 9470700Sjulian } 9552722Sjulian else { 9670700Sjulian strncpy(&buffer[EI_SPARE], type, EI_NINDENT-EI_SPARE); 9770700Sjulian lseek(fd, 0, SEEK_SET); 9852722Sjulian if (write(fd, buffer, EI_NINDENT) != EI_NINDENT) { 9970700Sjulian fprintf(stderr, "Error writing %s\n", argv[0]); 10070700Sjulian goto fail; 10170700Sjulian } 10270700Sjulian } 10352419Sjulianfail: 10452419Sjulian argc--; 10552419Sjulian argv++; 10652419Sjulian } 10770700Sjulian} 10852722Sjulian 10952419Sjulianint 11070700Sjulianusage() 11152419Sjulian{ 11270700Sjulian fprintf(stderr, "Usage: brandelf [-t string] file ...\n"); 11370700Sjulian} 11470700Sjulian