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