146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*-
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* Copyright (c) 1996 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <elf.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <err.h>
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static int iselftype(const char *);
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static void usage __P((void));
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int
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main(int argc, char **argv)
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{
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const char *type = "FreeBSD";
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int retval = 0;
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int ch, change = 0, verbose = 0, force = 0;
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while ((ch = getopt(argc, argv, "ft:v")) != -1)
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switch (ch) {
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case 'f':
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force = 1;
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break;
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case 'v':
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verbose = 1;
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break;
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case 't':
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change = 1;
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type = optarg;
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (!argc)
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errx(1, "no file(s) specified");
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if (!force && !iselftype(type))
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errx(1, "invalid ELF type '%s'", type);
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while (argc) {
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int fd;
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char buffer[EI_NIDENT];
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char string[(EI_NIDENT-EI_BRAND)+1];
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if ((fd = open(argv[0], change? O_RDWR: O_RDONLY, 0)) < 0) {
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warn("error opening file %s", argv[0]);
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retval = 1;
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goto fail;
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}
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if (read(fd, buffer, EI_NIDENT) < EI_NIDENT) {
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warnx("file '%s' too short", argv[0]);
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retval = 1;
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goto fail;
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}
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if (buffer[0] != ELFMAG0 || buffer[1] != ELFMAG1 ||
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buffer[2] != ELFMAG2 || buffer[3] != ELFMAG3) {
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warnx("file '%s' is not ELF format", argv[0]);
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retval = 1;
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goto fail;
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}
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if (!change) {
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bzero(string, sizeof(string));
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strncpy(string, &buffer[EI_BRAND], EI_NIDENT-EI_BRAND);
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if (strlen(string)) {
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fprintf(stdout,
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"File '%s' is of brand '%s'.\n",
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argv[0], string);
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if (!force && !iselftype(string))
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warnx("Brand '%s' is unknown",
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string);
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}
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else
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fprintf(stdout, "File '%s' has no branding.\n",
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argv[0]);
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}
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else {
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strncpy(&buffer[EI_BRAND], type, EI_NIDENT-EI_BRAND);
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lseek(fd, 0, SEEK_SET);
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if (write(fd, buffer, EI_NIDENT) != EI_NIDENT) {
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warnx("error writing %s", argv[0]);
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retval = 1;
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goto fail;
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}
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}
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fail:
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argc--;
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argv++;
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}
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return retval;
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}
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static void
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usage()
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{
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fprintf(stderr, "usage: brandelf [-f] [-v] [-t string] file ...\n");
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exit(1);
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}
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static int
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iselftype(const char *elftype) {
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/* XXX - any more types? */
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const char *elftypes[] = { "FreeBSD", "Linux", "SVR4" };
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int elfwalk;
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for (elfwalk = 0;
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elfwalk < sizeof(elftypes)/sizeof(elftypes[0]);
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elfwalk++)
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if (strcmp(elftype, elftypes[elfwalk]) == 0)
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return 1;
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return 0;
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}
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