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libfuse
passthrough_helpers.h
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  */
30 static 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 }