1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002 Tim J. Robbins. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * pathchk -- check pathnames 31 * 32 * Check whether files could be created with the names specified on the 33 * command line. If -p is specified, check whether the pathname is portable 34 * to all POSIX systems. 35 */ 36 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <limits.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 static int check(const char *); 49 static int portable(const char *); 50 static void usage(void); 51 52 static int pflag; /* Perform portability checks */ 53 static int Pflag; /* Check for empty paths, leading '-' */ 54 55 int 56 main(int argc, char *argv[]) 57 { 58 int ch, rval; 59 const char *arg; 60 61 while ((ch = getopt(argc, argv, "pP")) > 0) { 62 switch (ch) { 63 case 'p': 64 pflag = 1; 65 break; 66 case 'P': 67 Pflag = 1; 68 break; 69 default: 70 usage(); 71 /*NOTREACHED*/ 72 } 73 } 74 argc -= optind; 75 argv += optind; 76 77 if (argc == 0) 78 usage(); 79 80 rval = 0; 81 while ((arg = *argv++) != NULL) 82 rval |= check(arg); 83 84 exit(rval); 85 } 86 87 static void 88 usage(void) 89 { 90 91 fprintf(stderr, "usage: pathchk [-Pp] pathname ...\n"); 92 exit(1); 93 } 94 95 static int 96 check(const char *path) 97 { 98 struct stat sb; 99 long complen, namemax, pathmax, svnamemax; 100 int last; 101 char *end, *p, *pathd; 102 103 if ((pathd = strdup(path)) == NULL) 104 err(1, "strdup"); 105 106 p = pathd; 107 108 if (Pflag && *p == '\0') { 109 warnx("%s: empty pathname", path); 110 goto bad; 111 } 112 if ((Pflag || pflag) && (*p == '-' || strstr(p, "/-") != NULL)) { 113 warnx("%s: contains a component starting with '-'", path); 114 goto bad; 115 } 116 117 if (!pflag) { 118 errno = 0; 119 namemax = pathconf(*p == '/' ? "/" : ".", _PC_NAME_MAX); 120 if (namemax == -1 && errno != 0) 121 namemax = NAME_MAX; 122 } else 123 namemax = _POSIX_NAME_MAX; 124 125 for (;;) { 126 p += strspn(p, "/"); 127 complen = (long)strcspn(p, "/"); 128 end = p + complen; 129 last = *end == '\0'; 130 *end = '\0'; 131 132 if (namemax != -1 && complen > namemax) { 133 warnx("%s: %s: component too long (limit %ld)", path, 134 p, namemax); 135 goto bad; 136 } 137 138 if (!pflag && stat(pathd, &sb) == -1 && errno != ENOENT) { 139 warn("%s: %.*s", path, (int)(strlen(pathd) - 140 complen - 1), pathd); 141 goto bad; 142 } 143 144 if (pflag && !portable(p)) { 145 warnx("%s: %s: component contains non-portable " 146 "character", path, p); 147 goto bad; 148 } 149 150 if (last) 151 break; 152 153 if (!pflag) { 154 errno = 0; 155 svnamemax = namemax; 156 namemax = pathconf(pathd, _PC_NAME_MAX); 157 if (namemax == -1 && errno != 0) 158 namemax = svnamemax; 159 } 160 161 *end = '/'; 162 p = end + 1; 163 } 164 165 if (!pflag) { 166 errno = 0; 167 pathmax = pathconf(path, _PC_PATH_MAX); 168 if (pathmax == -1 && errno != 0) 169 pathmax = PATH_MAX; 170 } else 171 pathmax = _POSIX_PATH_MAX; 172 if (pathmax != -1 && strlen(path) >= (size_t)pathmax) { 173 warnx("%s: path too long (limit %ld)", path, pathmax - 1); 174 goto bad; 175 } 176 177 free(pathd); 178 return (0); 179 180 bad: free(pathd); 181 return (1); 182 } 183 184 /* 185 * Check whether a path component contains only portable characters. 186 */ 187 static int 188 portable(const char *path) 189 { 190 static const char charset[] = 191 "abcdefghijklmnopqrstuvwxyz" 192 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 193 "0123456789._-"; 194 long s; 195 196 s = strspn(path, charset); 197 if (path[s] != '\0') 198 return (0); 199 200 return (1); 201 } 202