Reported by: ci.freebsd.org (8 times so far) MFC after: 3 weeks MFC with: r346315 Sponsored by: The FreeBSD Foundation
235 lines
5.6 KiB
C
235 lines
5.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2000, 2001 David O'Brien
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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 without 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/elf_common.h>
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#include <sys/errno.h>
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#include <capsicum_helpers.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdbool.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 <libcasper.h>
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#include <casper/cap_fileargs.h>
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static int elftype(const char *);
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static const char *iselftype(int);
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static void printelftypes(void);
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static void usage(void);
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struct ELFtypes {
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const char *str;
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int value;
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};
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/* XXX - any more types? */
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static struct ELFtypes elftypes[] = {
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{ "FreeBSD", ELFOSABI_FREEBSD },
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{ "Linux", ELFOSABI_LINUX },
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{ "Solaris", ELFOSABI_SOLARIS },
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{ "SVR4", ELFOSABI_SYSV }
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};
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int
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main(int argc, char **argv)
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{
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const char *strtype = "FreeBSD";
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int ch, flags, retval, type;
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bool change, force, listed;
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fileargs_t *fa;
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cap_rights_t rights;
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type = ELFOSABI_FREEBSD;
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retval = 0;
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change = false;
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force = false;
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listed = false;
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while ((ch = getopt(argc, argv, "f:lt:v")) != -1)
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switch (ch) {
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case 'f':
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if (change)
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errx(1, "f option incompatible with t option");
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force = true;
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type = atoi(optarg);
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if (errno == ERANGE || type < 0 || type > 255) {
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warnx("invalid argument to option f: %s",
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optarg);
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usage();
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}
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break;
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case 'l':
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printelftypes();
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listed = true;
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break;
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case 'v':
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/* does nothing */
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break;
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case 't':
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if (force)
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errx(1, "t option incompatible with f option");
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change = true;
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strtype = 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 == 0) {
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if (listed)
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exit(0);
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else {
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warnx("no file(s) specified");
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usage();
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}
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}
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if (!force && (type = elftype(strtype)) == -1) {
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warnx("invalid ELF type '%s'", strtype);
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printelftypes();
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usage();
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}
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flags = change || force ? O_RDWR : O_RDONLY;
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cap_rights_init(&rights, CAP_READ, CAP_SEEK);
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if (flags == O_RDWR)
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cap_rights_set(&rights, CAP_WRITE);
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fa = fileargs_init(argc, argv, flags, 0, &rights, FA_OPEN);
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if (fa == NULL)
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errx(1, "unable to init casper");
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caph_cache_catpages();
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if (caph_limit_stdio() < 0 || caph_enter_casper() < 0)
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err(1, "unable to enter capability mode");
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while (argc != 0) {
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int fd;
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char buffer[EI_NIDENT];
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if ((fd = fileargs_open(fa, argv[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 && !force) {
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fprintf(stdout,
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"File '%s' is of brand '%s' (%u).\n",
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argv[0], iselftype(buffer[EI_OSABI]),
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buffer[EI_OSABI]);
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if (!iselftype(type)) {
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warnx("ELF ABI Brand '%u' is unknown",
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type);
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printelftypes();
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}
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}
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else {
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buffer[EI_OSABI] = type;
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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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warn("error writing %s %d", argv[0], fd);
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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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close(fd);
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argc--;
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argv++;
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}
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fileargs_free(fa);
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return (retval);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: brandelf [-lv] [-f ELF_ABI_number] [-t string] file ...\n");
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exit(1);
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}
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static const char *
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iselftype(int etype)
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{
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size_t elfwalk;
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for (elfwalk = 0; elfwalk < nitems(elftypes); elfwalk++)
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if (etype == elftypes[elfwalk].value)
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return (elftypes[elfwalk].str);
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return (0);
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}
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static int
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elftype(const char *elfstrtype)
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{
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size_t elfwalk;
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for (elfwalk = 0; elfwalk < nitems(elftypes); elfwalk++)
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if (strcasecmp(elfstrtype, elftypes[elfwalk].str) == 0)
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return (elftypes[elfwalk].value);
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return (-1);
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}
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static void
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printelftypes(void)
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{
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size_t elfwalk;
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fprintf(stderr, "known ELF types are: ");
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for (elfwalk = 0; elfwalk < nitems(elftypes); elfwalk++)
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fprintf(stderr, "%s(%u) ", elftypes[elfwalk].str,
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elftypes[elfwalk].value);
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fprintf(stderr, "\n");
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}
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