1 /* $OpenBSD: unveil-chdir.c,v 1.1 2019/08/04 09:00:17 bluhm Exp $ */
2 /*
3 * Copyright (c) 2019 Alexander Bluhm <bluhm@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <err.h>
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <stdio.h>
22 #include <unistd.h>
23
24 int
main(int argc,char * argv[])25 main(int argc, char *argv[])
26 {
27 char *cwd, *dir, *file, *path = NULL;
28
29 if (argc != 3 && argc != 4)
30 errx(2, "usage: unveil-chdir cwd dir [file]");
31
32 cwd = argv[1];
33 dir = argv[2];
34 file = argv[3];
35 if (file != NULL) {
36 if (asprintf(&path, "%s/%s", dir, file) == -1)
37 err(1, "asprintf");
38 }
39
40 if (chdir(cwd) == -1)
41 err(1, "chdir %s", cwd);
42
43 if (unveil(dir, "") == -1)
44 err(1, "unveil %s", dir);
45 if (file != NULL) {
46 if (open(path, O_RDONLY) != -1)
47 errx(1, "open %s succeeded", path);
48 if (errno != ENOENT)
49 err(1, "open %s error", path);
50 }
51
52 return 0;
53 }
54