static int mount_fuse(const char *mnt, const char *opts, char *devfd)
{
int res;
int fd;
char *dev;
struct stat stbuf;
char *type = NULL;
char *source = NULL;
char *mnt_opts = NULL;
const char *real_mnt = mnt;
int mountpoint_fd = -1;
fd = devfd ? check_fuse_device(devfd, &dev) : open_fuse_device(&dev);
if (fd == -1)
return -1;
drop_privs();
read_conf();
if (getuid() != 0 && mount_max != -1) {
int mount_count = count_fuse_fs();
if (mount_count >= mount_max) {
fprintf(stderr, "%s: too many FUSE filesystems mounted; mount_max=N can be set in /etc/fuse.conf\n", progname);
goto fail_close_fd;
}
}
res = check_version(dev);
if (res != -1) {
res = check_perm(&real_mnt, &stbuf, &mountpoint_fd);
restore_privs();
if (res != -1)
res = do_mount(real_mnt, &type, stbuf.st_mode & S_IFMT,
fd, opts, dev, &source, &mnt_opts,
stbuf.st_size);
} else
restore_privs();
if (mountpoint_fd != -1)
close(mountpoint_fd);
if (res == -1)
goto fail_close_fd;
res = chdir("/");
if (res == -1) {
fprintf(stderr, "%s: failed to chdir to '/'\n", progname);
goto fail_close_fd;
}
if (geteuid() == 0) {
res = add_mount(source, mnt, type, mnt_opts);
if (res == -1) {
/* Can't clean up mount in a non-racy way */
goto fail_close_fd;
}
}
out_free:
free(source);
free(type);
free(mnt_opts);
free(dev);
return fd;
fail_close_fd:
close(fd);
fd = -1;
goto out_free;
}
static int mount_fuse(const char *mnt, const char *opts, char *devfd)
{
int res;
int fd;
char *dev;
struct stat stbuf;
char *type = NULL;
char *source = NULL;
char *mnt_opts = NULL;
const char *real_mnt = mnt;
int currdir_fd = -1;
int mountpoint_fd = -1;
fd = devfd ? check_fuse_device(devfd, &dev) : open_fuse_device(&dev);
if (fd == -1)
return -1;
drop_privs();
read_conf();
if (getuid() != 0 && mount_max != -1) {
int mount_count = count_fuse_fs();
if (mount_count >= mount_max) {
fprintf(stderr, "%s: too many FUSE filesystems mounted; mount_max=N can be set in /etc/fuse.conf\n", progname);
close(fd);
return -1;
}
}
res = check_version(dev);
if (res != -1) {
res = check_perm(&real_mnt, &stbuf, &currdir_fd,
&mountpoint_fd);
restore_privs();
if (res != -1)
res = do_mount(real_mnt, &type, stbuf.st_mode & S_IFMT,
fd, opts, dev, &source, &mnt_opts,
stbuf.st_size);
} else
restore_privs();
if (currdir_fd != -1) {
fchdir(currdir_fd);
close(currdir_fd);
}
if (mountpoint_fd != -1)
close(mountpoint_fd);
if (res == -1) {
close(fd);
return -1;
}
if (geteuid() == 0) {
res = add_mount(source, mnt, type, mnt_opts);
if (res == -1) {
umount2(mnt, 2); /* lazy umount */
close(fd);
return -1;
}
}
free(source);
free(type);
free(mnt_opts);
free(dev);
return fd;
}