1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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
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/cdefs.h>
38 __FBSDID("$FreeBSD$");
39
40 #include <sys/types.h>
41 #include <sys/stat.h>
42
43 #include <err.h>
44 #include <errno.h>
45 #include <limits.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50
51 static int check(const char *);
52 static int portable(const char *);
53 static void usage(void);
54
55 static int pflag; /* Perform portability checks */
56 static int Pflag; /* Check for empty paths, leading '-' */
57
58 int
main(int argc,char * argv[])59 main(int argc, char *argv[])
60 {
61 int ch, rval;
62 const char *arg;
63
64 while ((ch = getopt(argc, argv, "pP")) > 0) {
65 switch (ch) {
66 case 'p':
67 pflag = 1;
68 break;
69 case 'P':
70 Pflag = 1;
71 break;
72 default:
73 usage();
74 /*NOTREACHED*/
75 }
76 }
77 argc -= optind;
78 argv += optind;
79
80 if (argc == 0)
81 usage();
82
83 rval = 0;
84 while ((arg = *argv++) != NULL)
85 rval |= check(arg);
86
87 exit(rval);
88 }
89
90 static void
usage(void)91 usage(void)
92 {
93
94 fprintf(stderr, "usage: pathchk [-Pp] pathname ...\n");
95 exit(1);
96 }
97
98 static int
check(const char * path)99 check(const char *path)
100 {
101 struct stat sb;
102 long complen, namemax, pathmax, svnamemax;
103 int last;
104 char *end, *p, *pathd;
105
106 if ((pathd = strdup(path)) == NULL)
107 err(1, "strdup");
108
109 p = pathd;
110
111 if (Pflag && *p == '\0') {
112 warnx("%s: empty pathname", path);
113 goto bad;
114 }
115 if ((Pflag || pflag) && (*p == '-' || strstr(p, "/-") != NULL)) {
116 warnx("%s: contains a component starting with '-'", path);
117 goto bad;
118 }
119
120 if (!pflag) {
121 errno = 0;
122 namemax = pathconf(*p == '/' ? "/" : ".", _PC_NAME_MAX);
123 if (namemax == -1 && errno != 0)
124 namemax = NAME_MAX;
125 } else
126 namemax = _POSIX_NAME_MAX;
127
128 for (;;) {
129 p += strspn(p, "/");
130 complen = (long)strcspn(p, "/");
131 end = p + complen;
132 last = *end == '\0';
133 *end = '\0';
134
135 if (namemax != -1 && complen > namemax) {
136 warnx("%s: %s: component too long (limit %ld)", path,
137 p, namemax);
138 goto bad;
139 }
140
141 if (!pflag && stat(pathd, &sb) == -1 && errno != ENOENT) {
142 warn("%s: %.*s", path, (int)(strlen(pathd) -
143 complen - 1), pathd);
144 goto bad;
145 }
146
147 if (pflag && !portable(p)) {
148 warnx("%s: %s: component contains non-portable "
149 "character", path, p);
150 goto bad;
151 }
152
153 if (last)
154 break;
155
156 if (!pflag) {
157 errno = 0;
158 svnamemax = namemax;
159 namemax = pathconf(pathd, _PC_NAME_MAX);
160 if (namemax == -1 && errno != 0)
161 namemax = svnamemax;
162 }
163
164 *end = '/';
165 p = end + 1;
166 }
167
168 if (!pflag) {
169 errno = 0;
170 pathmax = pathconf(path, _PC_PATH_MAX);
171 if (pathmax == -1 && errno != 0)
172 pathmax = PATH_MAX;
173 } else
174 pathmax = _POSIX_PATH_MAX;
175 if (pathmax != -1 && strlen(path) >= (size_t)pathmax) {
176 warnx("%s: path too long (limit %ld)", path, pathmax - 1);
177 goto bad;
178 }
179
180 free(pathd);
181 return (0);
182
183 bad: free(pathd);
184 return (1);
185 }
186
187 /*
188 * Check whether a path component contains only portable characters.
189 */
190 static int
portable(const char * path)191 portable(const char *path)
192 {
193 static const char charset[] =
194 "abcdefghijklmnopqrstuvwxyz"
195 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
196 "0123456789._-";
197 long s;
198
199 s = strspn(path, charset);
200 if (path[s] != '\0')
201 return (0);
202
203 return (1);
204 }
205