1/*
2 * FUSE: Filesystem in Userspace
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE
24 */
25
26/*
27 * Creates files on the underlying file system in response to a FUSE_MKNOD
28 * operation
29 */
30static int mknod_wrapper(int dirfd, const char *path, const char *link,
31	int mode, dev_t rdev)
32{
33	int res;
34
35	if (S_ISREG(mode)) {
36		res = openat(dirfd, path, O_CREAT | O_EXCL | O_WRONLY, mode);
37		if (res >= 0)
38			res = close(res);
39	} else if (S_ISDIR(mode)) {
40		res = mkdirat(dirfd, path, mode);
41	} else if (S_ISLNK(mode) && link != NULL) {
42		res = symlinkat(link, dirfd, path);
43	} else if (S_ISFIFO(mode)) {
44		res = mkfifoat(dirfd, path, mode);
45#ifdef __FreeBSD__
46	} else if (S_ISSOCK(mode)) {
47		struct sockaddr_un su;
48		int fd;
49
50		if (strlen(path) >= sizeof(su.sun_path)) {
51			errno = ENAMETOOLONG;
52			return -1;
53		}
54		fd = socket(AF_UNIX, SOCK_STREAM, 0);
55		if (fd >= 0) {
56			/*
57			 * We must bind the socket to the underlying file
58			 * system to create the socket file, even though
59			 * we'll never listen on this socket.
60			 */
61			su.sun_family = AF_UNIX;
62			strncpy(su.sun_path, path, sizeof(su.sun_path));
63			res = bindat(dirfd, fd, (struct sockaddr*)&su,
64				sizeof(su));
65			if (res == 0)
66				close(fd);
67		} else {
68			res = -1;
69		}
70#endif
71	} else {
72		res = mknodat(dirfd, path, mode, rdev);
73	}
74
75	return res;
76}
77