1 /* $NetBSD: pathchk.c,v 1.1 2003/04/15 19:46:40 jdolecek Exp $ */ 2 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 * from FreeBSD: pathchk.c,v 1.4 2002/12/15 00:40:47 tjr Exp 29 */ 30 31 #include <sys/cdefs.h> 32 #ifndef lint 33 __RCSID("$NetBSD: pathchk.c,v 1.1 2003/04/15 19:46:40 jdolecek Exp $"); 34 #endif /* !lint */ 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 static int check(const char *); 48 static int portable(const char *); 49 static void usage(void); 50 51 static int pflag; /* Perform portability checks */ 52 53 int 54 main(int argc, char *argv[]) 55 { 56 int ch, rval; 57 const char *arg; 58 59 while ((ch = getopt(argc, argv, "p")) > 0) { 60 switch (ch) { 61 case 'p': 62 pflag = 1; 63 break; 64 default: 65 usage(); 66 /*NOTREACHED*/ 67 } 68 } 69 argc -= optind; 70 argv += optind; 71 72 if (argc == 0) 73 usage(); 74 75 rval = 0; 76 while ((arg = *argv++) != NULL) 77 rval |= check(arg); 78 79 exit(rval); 80 } 81 82 static void 83 usage(void) 84 { 85 86 fprintf(stderr, "usage: pathchk [-p] pathname...\n"); 87 exit(1); 88 } 89 90 static int 91 check(const char *path) 92 { 93 struct stat sb; 94 long complen, namemax, pathmax, svnamemax; 95 int badch, last; 96 char *end, *p, *pathd; 97 98 if ((pathd = strdup(path)) == NULL) 99 err(1, "strdup"); 100 101 p = pathd; 102 103 if (!pflag) { 104 errno = 0; 105 namemax = pathconf(*p == '/' ? "/" : ".", _PC_NAME_MAX); 106 if (namemax == -1 && errno != 0) 107 namemax = NAME_MAX; 108 } else 109 namemax = _POSIX_NAME_MAX; 110 111 for (;;) { 112 p += strspn(p, "/"); 113 complen = (long)strcspn(p, "/"); 114 end = p + complen; 115 last = *end == '\0'; 116 *end = '\0'; 117 118 if (namemax != -1 && complen > namemax) { 119 warnx("%s: %s: component too long (limit %ld)", path, 120 p, namemax); 121 goto bad; 122 } 123 124 if (!pflag && stat(pathd, &sb) == -1 && errno != ENOENT) { 125 warn("%s: %.*s", path, (int)(strlen(pathd) - 126 complen - 1), pathd); 127 goto bad; 128 } 129 130 if (pflag && (badch = portable(p)) >= 0) { 131 warnx("%s: %s: component contains non-portable " 132 "character `%c'", path, p, badch); 133 goto bad; 134 } 135 136 if (last) 137 break; 138 139 if (!pflag) { 140 errno = 0; 141 svnamemax = namemax; 142 namemax = pathconf(pathd, _PC_NAME_MAX); 143 if (namemax == -1 && errno != 0) 144 namemax = svnamemax; 145 } 146 147 *end = '/'; 148 p = end + 1; 149 } 150 151 if (!pflag) { 152 errno = 0; 153 pathmax = pathconf(path, _PC_PATH_MAX); 154 if (pathmax == -1 && errno != 0) 155 pathmax = PATH_MAX; 156 } else 157 pathmax = _POSIX_PATH_MAX; 158 if (pathmax != -1 && strlen(path) >= (size_t)pathmax) { 159 warnx("%s: path too long (limit %ld)", path, pathmax - 1); 160 goto bad; 161 } 162 163 free(pathd); 164 return (0); 165 166 bad: free(pathd); 167 return (1); 168 } 169 170 /* 171 * Check whether a path component contains only portable characters. Return 172 * the first non-portable character found. 173 */ 174 static int 175 portable(const char *path) 176 { 177 static const char charset[] = 178 "abcdefghijklmnopqrstuvwxyz" 179 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 180 "0123456789._-"; 181 long s; 182 183 if (*path == '-') 184 return (*path); 185 186 s = strspn(path, charset); 187 if (path[s] != '\0') 188 return (path[s]); 189 190 return (-1); 191 } 192