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      1 /*	$NetBSD: pathchk.c,v 1.2 2011/09/16 15:39:28 joerg 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 1.2 2011/09/16 15:39:28 joerg 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 __dead 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