1 /*- 2 * Copyright (c) 2002 Tim J. Robbins. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * pathchk -- check pathnames 29 * 30 * Check whether files could be created with the names specified on the 31 * command line. If -p is specified, check whether the pathname is portable 32 * to all POSIX systems. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <limits.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 static int check(const char *); 50 static int portable(const char *); 51 static void usage(void); 52 53 static int pflag; /* Perform portability checks */ 54 static int Pflag; /* Check for empty paths, leading '-' */ 55 56 int 57 main(int argc, char *argv[]) 58 { 59 int ch, rval; 60 const char *arg; 61 62 while ((ch = getopt(argc, argv, "pP")) > 0) { 63 switch (ch) { 64 case 'p': 65 pflag = 1; 66 break; 67 case 'P': 68 Pflag = 1; 69 break; 70 default: 71 usage(); 72 /*NOTREACHED*/ 73 } 74 } 75 argc -= optind; 76 argv += optind; 77 78 if (argc == 0) 79 usage(); 80 81 rval = 0; 82 while ((arg = *argv++) != NULL) 83 rval |= check(arg); 84 85 exit(rval); 86 } 87 88 static void 89 usage(void) 90 { 91 92 fprintf(stderr, "usage: pathchk [-Pp] pathname ...\n"); 93 exit(1); 94 } 95 96 static int 97 check(const char *path) 98 { 99 struct stat sb; 100 long complen, namemax, pathmax, svnamemax; 101 int last; 102 char *end, *p, *pathd; 103 104 if ((pathd = strdup(path)) == NULL) 105 err(1, "strdup"); 106 107 p = pathd; 108 109 if (Pflag && *p == '\0') { 110 warnx("%s: empty pathname", path); 111 goto bad; 112 } 113 if ((Pflag || pflag) && (*p == '-' || strstr(p, "/-") != NULL)) { 114 warnx("%s: contains a component starting with '-'", path); 115 goto bad; 116 } 117 118 if (!pflag) { 119 errno = 0; 120 namemax = pathconf(*p == '/' ? "/" : ".", _PC_NAME_MAX); 121 if (namemax == -1 && errno != 0) 122 namemax = NAME_MAX; 123 } else 124 namemax = _POSIX_NAME_MAX; 125 126 for (;;) { 127 p += strspn(p, "/"); 128 complen = (long)strcspn(p, "/"); 129 end = p + complen; 130 last = *end == '\0'; 131 *end = '\0'; 132 133 if (namemax != -1 && complen > namemax) { 134 warnx("%s: %s: component too long (limit %ld)", path, 135 p, namemax); 136 goto bad; 137 } 138 139 if (!pflag && stat(pathd, &sb) == -1 && errno != ENOENT) { 140 warn("%s: %.*s", path, (int)(strlen(pathd) - 141 complen - 1), pathd); 142 goto bad; 143 } 144 145 if (pflag && !portable(p)) { 146 warnx("%s: %s: component contains non-portable " 147 "character", path, p); 148 goto bad; 149 } 150 151 if (last) 152 break; 153 154 if (!pflag) { 155 errno = 0; 156 svnamemax = namemax; 157 namemax = pathconf(pathd, _PC_NAME_MAX); 158 if (namemax == -1 && errno != 0) 159 namemax = svnamemax; 160 } 161 162 *end = '/'; 163 p = end + 1; 164 } 165 166 if (!pflag) { 167 errno = 0; 168 pathmax = pathconf(path, _PC_PATH_MAX); 169 if (pathmax == -1 && errno != 0) 170 pathmax = PATH_MAX; 171 } else 172 pathmax = _POSIX_PATH_MAX; 173 if (pathmax != -1 && strlen(path) >= (size_t)pathmax) { 174 warnx("%s: path too long (limit %ld)", path, pathmax - 1); 175 goto bad; 176 } 177 178 free(pathd); 179 return (0); 180 181 bad: free(pathd); 182 return (1); 183 } 184 185 /* 186 * Check whether a path component contains only portable characters. 187 */ 188 static int 189 portable(const char *path) 190 { 191 static const char charset[] = 192 "abcdefghijklmnopqrstuvwxyz" 193 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 194 "0123456789._-"; 195 long s; 196 197 s = strspn(path, charset); 198 if (path[s] != '\0') 199 return (0); 200 201 return (1); 202 } 203