/* * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1987, 1990, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/types.h> #include <sys/stat.h> #include <capsicum_helpers.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <getopt.h> #include <nl_types.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <libutil.h> #include "extern.h" bool bflag, lflag, sflag, xflag, zflag; static const struct option long_opts[] = { {"print-bytes", no_argument, NULL, 'b'}, {"ignore-initial", required_argument, NULL, 'i'}, {"verbose", no_argument, NULL, 'l'}, {"bytes", required_argument, NULL, 'n'}, {"silent", no_argument, NULL, 's'}, {"quiet", no_argument, NULL, 's'}, {NULL, no_argument, NULL, 0} }; #ifdef SIGINFO volatile sig_atomic_t info; static void siginfo(int signo) { info = signo; } #endif static void usage(void) __dead2; static bool parse_iskipspec(char *spec, off_t *skip1, off_t *skip2) { char *colon; colon = strchr(spec, ':'); if (colon != NULL) *colon++ = '\0'; if (expand_number(spec, skip1) < 0) return (false); if (colon != NULL) return (expand_number(colon, skip2) == 0); *skip2 = *skip1; return (true); } int main(int argc, char *argv[]) { struct stat sb1, sb2; off_t skip1, skip2, limit; int ch, fd1, fd2, oflag; bool special; const char *file1, *file2; limit = skip1 = skip2 = 0; oflag = O_RDONLY; while ((ch = getopt_long(argc, argv, "+bhi:ln:sxz", long_opts, NULL)) != -1) switch (ch) { case 'b': /* Print bytes */ bflag = true; break; case 'h': /* Don't follow symlinks */ oflag |= O_NOFOLLOW; break; case 'i': if (!parse_iskipspec(optarg, &skip1, &skip2)) { fprintf(stderr, "Invalid --ignore-initial: %s\n", optarg); usage(); } break; case 'l': /* print all differences */ lflag = true; break; case 'n': /* Limit */ if (expand_number(optarg, &limit) < 0 || limit < 0) { fprintf(stderr, "Invalid --bytes: %s\n", optarg); usage(); } break; case 's': /* silent run */ sflag = true; break; case 'x': /* hex output */ lflag = true; xflag = true; break; case 'z': /* compare size first */ zflag = true; break; case '?': default: usage(); } argv += optind; argc -= optind; if (lflag && sflag) errx(ERR_EXIT, "specifying -s with -l or -x is not permitted"); if (argc < 2 || argc > 4) usage(); /* Don't limit rights on stdin since it may be one of the inputs. */ if (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF)) err(ERR_EXIT, "unable to limit rights on stdout"); if (caph_limit_stream(STDERR_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF)) err(ERR_EXIT, "unable to limit rights on stderr"); /* Backward compatibility -- handle "-" meaning stdin. */ special = false; if (strcmp(file1 = argv[0], "-") == 0) { special = true; fd1 = STDIN_FILENO; file1 = "stdin"; } else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) { if (!sflag) err(ERR_EXIT, "%s", file1); else exit(ERR_EXIT); } if (strcmp(file2 = argv[1], "-") == 0) { if (special) errx(ERR_EXIT, "standard input may only be specified once"); special = true; fd2 = STDIN_FILENO; file2 = "stdin"; } else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) { if (!sflag) err(ERR_EXIT, "%s", file2); else exit(ERR_EXIT); } if (argc > 2 && expand_number(argv[2], &skip1) < 0) { fprintf(stderr, "Invalid skip1: %s\n", argv[2]); usage(); } if (argc == 4 && expand_number(argv[3], &skip2) < 0) { fprintf(stderr, "Invalid skip2: %s\n", argv[3]); usage(); } if (sflag && skip1 == 0 && skip2 == 0) zflag = true; if (fd1 == -1) { if (fd2 == -1) { c_link(file1, skip1, file2, skip2, limit); exit(0); } else if (!sflag) errx(ERR_EXIT, "%s: Not a symbolic link", file2); else exit(ERR_EXIT); } else if (fd2 == -1) { if (!sflag) errx(ERR_EXIT, "%s: Not a symbolic link", file1); else exit(ERR_EXIT); } /* FD rights are limited in c_special() and c_regular(). */ caph_cache_catpages(); if (!special) { if (fstat(fd1, &sb1)) { if (!sflag) err(ERR_EXIT, "%s", file1); else exit(ERR_EXIT); } if (!S_ISREG(sb1.st_mode)) special = true; else { if (fstat(fd2, &sb2)) { if (!sflag) err(ERR_EXIT, "%s", file2); else exit(ERR_EXIT); } if (!S_ISREG(sb2.st_mode)) special = true; } } #ifdef SIGINFO (void)signal(SIGINFO, siginfo); #endif if (special) c_special(fd1, file1, skip1, fd2, file2, skip2, limit); else { if (zflag && sb1.st_size != sb2.st_size) { if (!sflag) (void) printf("%s %s differ: size\n", file1, file2); exit(DIFF_EXIT); } c_regular(fd1, file1, skip1, sb1.st_size, fd2, file2, skip2, sb2.st_size, limit); } exit(0); } static void usage(void) { (void)fprintf(stderr, "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n"); exit(ERR_EXIT); }