Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 1 | /* |
| 2 | FUSE: Filesystem in Userspace |
Miklos Szeredi | 149f607 | 2005-01-10 12:29:28 +0000 | [diff] [blame] | 3 | Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 4 | |
| 5 | This program can be distributed under the terms of the GNU LGPL. |
| 6 | See the file COPYING.LIB. |
| 7 | */ |
| 8 | |
| 9 | #include "fuse.h" |
Miklos Szeredi | 0b6a0ad | 2004-12-04 00:40:50 +0000 | [diff] [blame] | 10 | #include "fuse_compat.h" |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | #include <unistd.h> |
| 15 | #include <fcntl.h> |
| 16 | #include <errno.h> |
| 17 | #include <sys/socket.h> |
| 18 | #include <sys/un.h> |
| 19 | #include <sys/wait.h> |
| 20 | |
| 21 | #define FUSERMOUNT_PROG "fusermount" |
| 22 | #define FUSE_COMMFD_ENV "_FUSE_COMMFD" |
| 23 | |
| 24 | |
| 25 | /* return value: |
| 26 | * >= 0 => fd |
| 27 | * -1 => error |
| 28 | */ |
| 29 | static int receive_fd(int fd) |
| 30 | { |
| 31 | struct msghdr msg; |
| 32 | struct iovec iov; |
| 33 | char buf[1]; |
| 34 | int rv; |
| 35 | int connfd = -1; |
| 36 | char ccmsg[CMSG_SPACE(sizeof(connfd))]; |
| 37 | struct cmsghdr *cmsg; |
| 38 | |
| 39 | iov.iov_base = buf; |
| 40 | iov.iov_len = 1; |
| 41 | |
| 42 | msg.msg_name = 0; |
| 43 | msg.msg_namelen = 0; |
| 44 | msg.msg_iov = &iov; |
| 45 | msg.msg_iovlen = 1; |
| 46 | /* old BSD implementations should use msg_accrights instead of |
| 47 | * msg_control; the interface is different. */ |
| 48 | msg.msg_control = ccmsg; |
| 49 | msg.msg_controllen = sizeof(ccmsg); |
| 50 | |
| 51 | while(((rv = recvmsg(fd, &msg, 0)) == -1) && errno == EINTR); |
| 52 | if (rv == -1) { |
| 53 | perror("recvmsg"); |
| 54 | return -1; |
| 55 | } |
| 56 | if(!rv) { |
| 57 | /* EOF */ |
| 58 | return -1; |
| 59 | } |
Miklos Szeredi | e518374 | 2005-02-02 11:14:04 +0000 | [diff] [blame] | 60 | |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 61 | cmsg = CMSG_FIRSTHDR(&msg); |
| 62 | if (!cmsg->cmsg_type == SCM_RIGHTS) { |
| 63 | fprintf(stderr, "got control message of unknown type %d\n", |
| 64 | cmsg->cmsg_type); |
| 65 | return -1; |
| 66 | } |
| 67 | return *(int*)CMSG_DATA(cmsg); |
| 68 | } |
| 69 | |
| 70 | void fuse_unmount(const char *mountpoint) |
| 71 | { |
| 72 | const char *mountprog = FUSERMOUNT_PROG; |
| 73 | char umount_cmd[1024]; |
Miklos Szeredi | e518374 | 2005-02-02 11:14:04 +0000 | [diff] [blame] | 74 | |
Miklos Szeredi | 9b813af | 2005-07-21 07:59:37 +0000 | [diff] [blame] | 75 | snprintf(umount_cmd, sizeof(umount_cmd) - 1, "%s -u -q -z -- %s", |
| 76 | mountprog, mountpoint); |
Miklos Szeredi | e518374 | 2005-02-02 11:14:04 +0000 | [diff] [blame] | 77 | |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 78 | umount_cmd[sizeof(umount_cmd) - 1] = '\0'; |
| 79 | system(umount_cmd); |
| 80 | } |
| 81 | |
Miklos Szeredi | bd7661b | 2004-07-23 17:16:29 +0000 | [diff] [blame] | 82 | int fuse_mount(const char *mountpoint, const char *opts) |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 83 | { |
| 84 | const char *mountprog = FUSERMOUNT_PROG; |
| 85 | int fds[2], pid; |
| 86 | int res; |
| 87 | int rv; |
| 88 | |
| 89 | res = socketpair(PF_UNIX, SOCK_STREAM, 0, fds); |
| 90 | if(res == -1) { |
| 91 | perror("fuse: socketpair() failed"); |
| 92 | return -1; |
| 93 | } |
| 94 | |
Miklos Szeredi | 3520093 | 2005-09-28 14:50:49 +0000 | [diff] [blame] | 95 | #ifdef HAVE_FORK |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 96 | pid = fork(); |
Miklos Szeredi | a25d4c2 | 2004-11-23 22:32:16 +0000 | [diff] [blame] | 97 | #else |
| 98 | pid = vfork(); |
| 99 | #endif |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 100 | if(pid == -1) { |
| 101 | perror("fuse: fork() failed"); |
| 102 | close(fds[0]); |
| 103 | close(fds[1]); |
| 104 | return -1; |
| 105 | } |
| 106 | |
| 107 | if(pid == 0) { |
| 108 | char env[10]; |
Miklos Szeredi | 9b813af | 2005-07-21 07:59:37 +0000 | [diff] [blame] | 109 | const char *argv[32]; |
| 110 | int a = 0; |
Miklos Szeredi | f6e0ec6 | 2005-08-03 09:11:06 +0000 | [diff] [blame] | 111 | |
Miklos Szeredi | 9b813af | 2005-07-21 07:59:37 +0000 | [diff] [blame] | 112 | argv[a++] = mountprog; |
| 113 | if (opts) { |
| 114 | argv[a++] = "-o"; |
| 115 | argv[a++] = opts; |
| 116 | } |
| 117 | argv[a++] = "--"; |
| 118 | argv[a++] = mountpoint; |
| 119 | argv[a++] = NULL; |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 120 | |
| 121 | close(fds[1]); |
| 122 | fcntl(fds[0], F_SETFD, 0); |
| 123 | snprintf(env, sizeof(env), "%i", fds[0]); |
| 124 | setenv(FUSE_COMMFD_ENV, env, 1); |
Miklos Szeredi | bd7661b | 2004-07-23 17:16:29 +0000 | [diff] [blame] | 125 | execvp(mountprog, (char **) argv); |
Miklos Szeredi | 0f48a26 | 2002-12-05 14:23:01 +0000 | [diff] [blame] | 126 | perror("fuse: failed to exec fusermount"); |
| 127 | exit(1); |
| 128 | } |
| 129 | |
| 130 | close(fds[0]); |
| 131 | rv = receive_fd(fds[1]); |
| 132 | close(fds[1]); |
| 133 | waitpid(pid, NULL, 0); /* bury zombie */ |
| 134 | |
| 135 | return rv; |
| 136 | } |
Miklos Szeredi | 0b6a0ad | 2004-12-04 00:40:50 +0000 | [diff] [blame] | 137 | |
Miklos Szeredi | f458b8c | 2004-12-07 16:46:42 +0000 | [diff] [blame] | 138 | int fuse_mount_compat1(const char *mountpoint, const char *args[]) |
Miklos Szeredi | 0b6a0ad | 2004-12-04 00:40:50 +0000 | [diff] [blame] | 139 | { |
| 140 | /* just ignore mount args for now */ |
| 141 | (void) args; |
| 142 | return fuse_mount(mountpoint, NULL); |
| 143 | } |