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
52static int	 check(const char *);
53static int	 portable(const char *);
54static void	 usage(void);
55
56static int	 pflag;			/* Perform portability checks */
57
58int
59main(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
87static void
88usage(void)
89{
90
91	fprintf(stderr, "usage: pathchk [-p] pathname...\n");
92	exit(1);
93}
94
95static int
96check(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
171bad:	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 */
179static int
180portable(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}
197