pathchk/pathchk.c

   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
  37 /* Commenting __FBSDID, as it is not needed n OSX ......
  38 __FBSDID("$FreeBSD: src/usr.bin/pathchk/pathchk.c,v 1.4 2002/12/15 00:40:47 tjr Exp $");
  39 */
  40
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <limits.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 static int       check(const char *);
  53 static int       portable(const char *);
  54 static void      usage(void);
  55
  56 static int       pflag;                 /* Perform portability checks */
  57
  58 int
  59 main(int argc, char *argv[])
  60 {
  61         int ch, rval;
  62         const char *arg;
  63
  64         while ((ch = getopt(argc, argv, "p")) > 0) {
  65                 switch (ch) {
  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 [-p] 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 badch, 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) {
 109                 errno = 0;
 110                 namemax = pathconf(*p == '/' ? "/" : ".", _PC_NAME_MAX);
 111                 if (namemax == -1 && errno != 0)
 112                         namemax = NAME_MAX;
 113         } else
 114                 namemax = _POSIX_NAME_MAX;
 115
 116         for (;;) {
 117                 p += strspn(p, "/");
 118                 complen = (long)strcspn(p, "/");
 119                 end = p + complen;
 120                 last = *end == '\0';
 121                 *end = '\0';
 122
 123                 if (namemax != -1 && complen > namemax) {
 124                         warnx("%s: %s: component too long (limit %ld)", path,
 125                             p, namemax);
 126                         goto bad;
 127                 }
 128
 129                 if (!pflag && stat(pathd, &sb) == -1 && errno != ENOENT) {
 130                         warn("%s: %.*s", path, (int)(strlen(pathd) -
 131                             complen - 1), pathd);
 132                         goto bad;
 133                 }
 134
 135                 if (pflag && (badch = portable(p)) >= 0) {
 136                         warnx("%s: %s: component contains non-portable "
 137                             "character `%c'", path, p, badch);
 138                         goto bad;
 139                 }
 140
 141                 if (last)
 142                         break;
 143
 144                 if (!pflag) {
 145                         errno = 0;
 146                         svnamemax = namemax;
 147                         namemax = pathconf(pathd, _PC_NAME_MAX);
 148                         if (namemax == -1 && errno != 0)
 149                                 namemax = svnamemax;
 150                 }
 151
 152                 *end = '/';
 153                 p = end + 1;
 154         }
 155
 156         if (!pflag) {
 157                 errno = 0;
 158                 pathmax = pathconf(path, _PC_PATH_MAX);
 159                 if (pathmax == -1 && errno != 0)
 160                         pathmax = PATH_MAX;
 161         } else
 162                 pathmax = _POSIX_PATH_MAX;
 163         if (pathmax != -1 && strlen(path) >= (size_t)pathmax) {
 164                 warnx("%s: path too long (limit %ld)", path, pathmax - 1);
 165                 goto bad;
 166         }
 167
 168         free(pathd);
 169         return (0);
 170
 171 bad:    free(pathd);
 172         return (1);
 173 }
 174
 175 /*
 176  * Check whether a path component contains only portable characters. Return
 177  * the first non-portable character found.
 178  */
 179 static int
 180 portable(const char *path)
 181 {
 182         static const char charset[] =
 183             "abcdefghijklmnopqrstuvwxyz"
 184             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 185             "0123456789._-";
 186         long s;
 187
 188         if (*path == '-')
 189                 return (*path);
 190
 191         s = strspn(path, charset);
 192         if (path[s] != '\0')
 193                 return (path[s]);
 194
 195         return (-1);
 196 }