usr.bin/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  * $FreeBSD: head/usr.bin/pathchk/pathchk.c 256800 2013-10-20 20:10:31Z jilles $
  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 }