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 * $FreeBSD: src/usr.bin/pathchk/pathchk.c,v 1.2.2.1 2002/11/08 04:20:33 tjr Exp $ 27 * $DragonFly: src/usr.bin/pathchk/pathchk.c,v 1.2 2003/06/17 04:29:30 dillon Exp $ 28 */ 29 30 /* 31 * pathchk -- check pathnames 32 * 33 * Check whether files could be created with the names specified on the 34 * command line. If -p is specified, check whether the pathname is portable 35 * to all POSIX systems. 36 */ 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 55 int 56 main(int argc, char *argv[]) 57 { 58 int ch, rval; 59 const char *arg; 60 61 while ((ch = getopt(argc, argv, "p")) > 0) { 62 switch (ch) { 63 case 'p': 64 pflag = 1; 65 break; 66 default: 67 usage(); 68 /*NOTREACHED*/ 69 } 70 } 71 argc -= optind; 72 argv += optind; 73 74 if (argc == 0) 75 usage(); 76 77 rval = 0; 78 while ((arg = *argv++) != NULL) 79 rval |= check(arg); 80 81 exit(rval); 82 } 83 84 static void 85 usage(void) 86 { 87 88 fprintf(stderr, "usage: pathchk [-p] pathname...\n"); 89 exit(1); 90 } 91 92 static int 93 check(const char *path) 94 { 95 struct stat sb; 96 long complen, namemax, pathmax, svnamemax; 97 int badch, last; 98 char *end, *p, *pathd; 99 100 if ((pathd = strdup(path)) == NULL) 101 err(1, "strdup"); 102 103 p = pathd; 104 105 if (!pflag) { 106 errno = 0; 107 namemax = pathconf(*p == '/' ? "/" : ".", _PC_NAME_MAX); 108 if (namemax == -1 && errno != 0) 109 namemax = NAME_MAX; 110 } else 111 namemax = _POSIX_NAME_MAX; 112 113 for (;;) { 114 p += strspn(p, "/"); 115 complen = (long)strcspn(p, "/"); 116 end = p + complen; 117 last = *end == '\0'; 118 *end = '\0'; 119 120 if (namemax != -1 && complen > namemax) { 121 warnx("%s: %s: component too long (limit %ld)", path, 122 p, namemax); 123 goto bad; 124 } 125 126 if (!pflag && stat(pathd, &sb) == -1 && errno != ENOENT) { 127 warn("%s: %.*s", path, (int)(strlen(pathd) - 128 complen - 1), pathd); 129 goto bad; 130 } 131 132 if (pflag && (badch = portable(p)) >= 0) { 133 warnx("%s: %s: component contains non-portable " 134 "character `%c'", path, p, badch); 135 goto bad; 136 } 137 138 if (last) 139 break; 140 141 if (!pflag) { 142 errno = 0; 143 svnamemax = namemax; 144 namemax = pathconf(pathd, _PC_NAME_MAX); 145 if (namemax == -1 && errno != 0) 146 namemax = svnamemax; 147 } 148 149 *end = '/'; 150 p = end + 1; 151 } 152 153 if (!pflag) { 154 errno = 0; 155 pathmax = pathconf(path, _PC_PATH_MAX); 156 if (pathmax == -1 && errno != 0) 157 pathmax = PATH_MAX; 158 } else 159 pathmax = _POSIX_PATH_MAX; 160 if (pathmax != -1 && strlen(path) > (size_t)pathmax) { 161 warnx("%s: path too long (limit %ld)", path, pathmax); 162 goto bad; 163 } 164 165 free(pathd); 166 return (0); 167 168 bad: free(pathd); 169 return (1); 170 } 171 172 /* 173 * Check whether a path component contains only portable characters. Return 174 * the first non-portable character found. 175 */ 176 static int 177 portable(const char *path) 178 { 179 static const char charset[] = 180 "abcdefghijklmnopqrstuvwxyz" 181 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 182 "0123456789._-"; 183 long s; 184 185 if (*path == '-') 186 return (*path); 187 188 s = strspn(path, charset); 189 if (path[s] != '\0') 190 return (path[s]); 191 192 return (-1); 193 } 194