static int do_mount(const char *mnt, char **typep, mode_t rootmode,
int fd, const char *opts, const char *dev, char **sourcep,
char **mnt_optsp, off_t rootsize)
{
int res;
int flags = MS_NOSUID | MS_NODEV;
char *optbuf;
char *mnt_opts = NULL;
const char *s;
char *d;
char *fsname = NULL;
char *subtype = NULL;
char *source = NULL;
char *type = NULL;
int check_empty = 1;
int blkdev = 0;
optbuf = (char *) malloc(strlen(opts) + 128);
if (!optbuf) {
fprintf(stderr, "%s: failed to allocate memory\n", progname);
return -1;
}
for (s = opts, d = optbuf; *s;) {
unsigned len;
const char *fsname_str = "fsname=";
const char *subtype_str = "subtype=";
for (len = 0; s[len]; len++) {
if (s[len] == '\\' && s[len + 1])
len++;
else if (s[len] == ',')
break;
}
if (begins_with(s, fsname_str)) {
if (!get_string_opt(s, len, fsname_str, &fsname))
goto err;
} else if (begins_with(s, subtype_str)) {
if (!get_string_opt(s, len, subtype_str, &subtype))
goto err;
} else if (opt_eq(s, len, "blkdev")) {
if (getuid() != 0) {
fprintf(stderr,
"%s: option blkdev is privileged\n",
progname);
goto err;
}
blkdev = 1;
} else if (opt_eq(s, len, "nonempty")) {
check_empty = 0;
} else if (!begins_with(s, "fd=") &&
!begins_with(s, "rootmode=") &&
!begins_with(s, "user_id=") &&
!begins_with(s, "group_id=")) {
int on;
int flag;
int skip_option = 0;
if (opt_eq(s, len, "large_read")) {
struct utsname utsname;
unsigned kmaj, kmin;
res = uname(&utsname);
if (res == 0 &&
sscanf(utsname.release, "%u.%u",
&kmaj, &kmin) == 2 &&
(kmaj > 2 || (kmaj == 2 && kmin > 4))) {
fprintf(stderr, "%s: note: 'large_read' mount option is deprecated for %i.%i kernels\n", progname, kmaj, kmin);
skip_option = 1;
}
}
if (getuid() != 0 && !user_allow_other &&
(opt_eq(s, len, "allow_other") ||
opt_eq(s, len, "allow_root"))) {
fprintf(stderr, "%s: option %.*s only allowed if 'user_allow_other' is set in /etc/fuse.conf\n", progname, len, s);
goto err;
}
if (!skip_option) {
if (find_mount_flag(s, len, &on, &flag)) {
if (on)
flags |= flag;
else
flags &= ~flag;
} else {
memcpy(d, s, len);
d += len;
*d++ = ',';
}
}
}
s += len;
if (*s)
s++;
}
*d = '\0';
res = get_mnt_opts(flags, optbuf, &mnt_opts);
if (res == -1)
goto err;
sprintf(d, "fd=%i,rootmode=%o,user_id=%i,group_id=%i",
fd, rootmode, getuid(), getgid());
if (check_empty &&
fuse_mnt_check_empty(progname, mnt, rootmode, rootsize) == -1)
goto err;
source = malloc((fsname ? strlen(fsname) : 0) +
(subtype ? strlen(subtype) : 0) + strlen(dev) + 32);
type = malloc((subtype ? strlen(subtype) : 0) + 32);
if (!type || !source) {
fprintf(stderr, "%s: failed to allocate memory\n", progname);
goto err;
}
if (subtype)
sprintf(type, "%s.%s", blkdev ? "fuseblk" : "fuse", subtype);
else
strcpy(type, blkdev ? "fuseblk" : "fuse");
if (fsname)
strcpy(source, fsname);
else
strcpy(source, subtype ? subtype : dev);
res = mount(source, mnt, type, flags, optbuf);
if (res == -1 && errno == ENODEV && subtype) {
/* Probably missing subtype support */
strcpy(type, blkdev ? "fuseblk" : "fuse");
if (fsname) {
if (!blkdev)
sprintf(source, "%s#%s", subtype, fsname);
} else {
strcpy(source, type);
}
res = mount(source, mnt, type, flags, optbuf);
}
if (res == -1 && errno == EINVAL) {
/* It could be an old version not supporting group_id */
sprintf(d, "fd=%i,rootmode=%o,user_id=%i",
fd, rootmode, getuid());
res = mount(source, mnt, type, flags, optbuf);
}
if (res == -1) {
int errno_save = errno;
if (blkdev && errno == ENODEV && !fuse_mnt_check_fuseblk())
fprintf(stderr, "%s: 'fuseblk' support missing\n",
progname);
else
fprintf(stderr, "%s: mount failed: %s\n", progname,
strerror(errno_save));
goto err;
}
*sourcep = source;
*typep = type;
*mnt_optsp = mnt_opts;
free(fsname);
free(optbuf);
return 0;
err:
free(fsname);
free(subtype);
free(source);
free(type);
free(mnt_opts);
free(optbuf);
return -1;
}
static int fuse_mount_sys(const char *mnt, struct mount_opts *mo,
const char *mnt_opts)
{
char tmp[128];
const char *devname = "/dev/fuse";
char *source = NULL;
char *type = NULL;
struct stat stbuf;
int fd;
int res;
if (!mnt) {
fprintf(stderr, "fuse: missing mountpoint parameter\n");
return -1;
}
res = stat(mnt, &stbuf);
if (res == -1) {
fprintf(stderr ,"fuse: failed to access mountpoint %s: %s\n",
mnt, strerror(errno));
return -1;
}
if (!mo->nonempty) {
res = fuse_mnt_check_empty("fuse", mnt, stbuf.st_mode,
stbuf.st_size);
if (res == -1)
return -1;
}
if (mo->auto_unmount) {
/* Tell the caller to fallback to fusermount because
auto-unmount does not work otherwise. */
return -2;
}
fd = open(devname, O_RDWR);
if (fd == -1) {
if (errno == ENODEV || errno == ENOENT)
fprintf(stderr, "fuse: device not found, try 'modprobe fuse' first\n");
else
fprintf(stderr, "fuse: failed to open %s: %s\n",
devname, strerror(errno));
return -1;
}
snprintf(tmp, sizeof(tmp), "fd=%i,rootmode=%o,user_id=%i,group_id=%i",
fd, stbuf.st_mode & S_IFMT, getuid(), getgid());
res = fuse_opt_add_opt(&mo->kernel_opts, tmp);
if (res == -1)
goto out_close;
source = malloc((mo->fsname ? strlen(mo->fsname) : 0) +
(mo->subtype ? strlen(mo->subtype) : 0) +
strlen(devname) + 32);
type = malloc((mo->subtype ? strlen(mo->subtype) : 0) + 32);
if (!type || !source) {
fprintf(stderr, "fuse: failed to allocate memory\n");
goto out_close;
}
strcpy(type, mo->blkdev ? "fuseblk" : "fuse");
if (mo->subtype) {
strcat(type, ".");
strcat(type, mo->subtype);
}
strcpy(source,
mo->fsname ? mo->fsname : (mo->subtype ? mo->subtype : devname));
res = mount(source, mnt, type, mo->flags, mo->kernel_opts);
if (res == -1 && errno == ENODEV && mo->subtype) {
/* Probably missing subtype support */
strcpy(type, mo->blkdev ? "fuseblk" : "fuse");
if (mo->fsname) {
if (!mo->blkdev)
sprintf(source, "%s#%s", mo->subtype,
mo->fsname);
} else {
strcpy(source, type);
}
res = mount(source, mnt, type, mo->flags, mo->kernel_opts);
}
if (res == -1) {
/*
* Maybe kernel doesn't support unprivileged mounts, in this
* case try falling back to fusermount
*/
if (errno == EPERM) {
res = -2;
} else {
int errno_save = errno;
if (mo->blkdev && errno == ENODEV &&
!fuse_mnt_check_fuseblk())
fprintf(stderr,
"fuse: 'fuseblk' support missing\n");
else
fprintf(stderr, "fuse: mount failed: %s\n",
strerror(errno_save));
}
goto out_close;
}
#ifndef __NetBSD__
#ifndef IGNORE_MTAB
if (geteuid() == 0) {
char *newmnt = fuse_mnt_resolve_path("fuse", mnt);
res = -1;
if (!newmnt)
goto out_umount;
res = fuse_mnt_add_mount("fuse", source, newmnt, type,
mnt_opts);
free(newmnt);
if (res == -1)
goto out_umount;
}
#endif /* IGNORE_MTAB */
#endif /* __NetBSD__ */
free(type);
free(source);
return fd;
out_umount:
umount2(mnt, 2); /* lazy umount */
out_close:
free(type);
free(source);
close(fd);
return res;
}
static int fuse_mount_sys(const char *mnt, struct mount_opts *mo,
const char *mnt_opts)
{
char tmp[128];
const char *devname = "/dev/fuse";
char *source = NULL;
char *type = NULL;
struct stat stbuf;
int fd;
int res;
if (!mnt) {
fprintf(stderr, "fuse: missing mountpoint\n");
return -1;
}
res = lstat(mnt, &stbuf);
if (res == -1) {
fprintf(stderr ,"fuse: failed to access mountpoint %s: %s\n",
mnt, strerror(errno));
return -1;
}
if (!mo->nonempty) {
res = fuse_mnt_check_empty("fuse", mnt, stbuf.st_mode, stbuf.st_size);
if (res == -1)
return -1;
}
fd = open(devname, O_RDWR);
if (fd == -1) {
if (errno == ENODEV || errno == ENOENT)
fprintf(stderr,
"fuse: device not found, try 'modprobe fuse' first\n");
else
fprintf(stderr, "fuse: failed to open %s: %s\n", devname,
strerror(errno));
return -1;
}
snprintf(tmp, sizeof(tmp), "fd=%i,rootmode=%o,user_id=%i,group_id=%i", fd,
stbuf.st_mode & S_IFMT, getuid(), getgid());
res = fuse_opt_add_opt(&mo->kernel_opts, tmp);
if (res == -1)
goto out_close;
source = malloc((mo->fsname ? strlen(mo->fsname) : 0) +
(mo->subtype ? strlen(mo->subtype) : 0) +
strlen(devname) + 32);
type = malloc((mo->subtype ? strlen(mo->subtype) : 0) + 32);
if (!type || !source) {
fprintf(stderr, "fuse: failed to allocate memory\n");
goto out_close;
}
strcpy(type, mo->blkdev ? "fuseblk" : "fuse");
if (mo->subtype) {
strcat(type, ".");
strcat(type, mo->subtype);
}
strcpy(source,
mo->fsname ? mo->fsname : (mo->subtype ? mo->subtype : devname));
#ifdef __SOLARIS__
res = mount(source, mnt, MS_OPTIONSTR|mo->flags, type, NULL, 0,
mo->kernel_opts, MAX_MNTOPT_STR);
#else
res = mount(source, mnt, type, mo->flags, mo->kernel_opts);
#endif /* __SOLARIS__ */
#ifdef __SOLARIS__
if (res == -1 && errno == EINVAL && mo->subtype) {
#else
if (res == -1 && errno == ENODEV && mo->subtype) {
#endif
/* Probably missing subtype support */
strcpy(type, mo->blkdev ? "fuseblk" : "fuse");
if (mo->fsname) {
if (!mo->blkdev)
sprintf(source, "%s#%s", mo->subtype, mo->fsname);
} else {
strcpy(source, type);
}
#ifdef __SOLARIS__
res = mount(source, mnt, MS_OPTIONSTR|mo->flags, type, NULL, 0,
mo->kernel_opts, MAX_MNTOPT_STR);
#else
res = mount(source, mnt, type, mo->flags, mo->kernel_opts);
#endif /* __SOLARIS__ */
}
if (res == -1) {
/*
* Maybe kernel doesn't support unprivileged mounts, in this
* case try falling back to fusermount
*/
if (errno == EPERM) {
res = -2;
} else {
int errno_save = errno;
if (mo->blkdev && errno == ENODEV && !fuse_mnt_check_fuseblk())
fprintf(stderr, "fuse: 'fuseblk' support missing\n");
else
fprintf(stderr, "fuse: mount failed: %s\n",
strerror(errno_save));
}
goto out_close;
}
#ifndef __SOLARIS__
if (geteuid() == 0) {
char *newmnt = fuse_mnt_resolve_path("fuse", mnt);
res = -1;
if (!newmnt)
goto out_umount;
res = fuse_mnt_add_mount("fuse", source, newmnt, type, mnt_opts);
free(newmnt);
if (res == -1)
goto out_umount;
}
#endif /* __SOLARIS__ */
return fd;
out_umount:
umount2(mnt, 2); /* lazy umount */
out_close:
free(type);
free(source);
close(fd);
return res;
}
static int get_mnt_flag_opts(char **mnt_optsp, int flags)
{
int i;
if (!(flags & MS_RDONLY) && fuse_opt_add_opt(mnt_optsp, "rw") == -1)
return -1;
for (i = 0; mount_flags[i].opt != NULL; i++) {
if (mount_flags[i].on && (flags & mount_flags[i].flag) &&
fuse_opt_add_opt(mnt_optsp, mount_flags[i].opt) == -1)
return -1;
}
return 0;
}
static int do_mount(const char *mnt, char **typep, mode_t rootmode,
int fd, const char *opts, const char *dev, char **sourcep,
char **mnt_optsp, off_t rootsize)
{
int res;
#ifdef __SOLARIS__
/*
* In Solaris, nosuid is equivalent to nosetuid + nodevices. We only
* have MS_NOSUID for mount flags (no MS_(NO)SETUID, etc.). But if
* we set that as a default, it restricts specifying just nosetuid
* or nodevices; there is no way for the user to specify setuid +
* nodevices or vice-verse.
* On the chance that this is being run from root, we won't try
* to add nosetuid or nodevices restrictions; this program must
* be exec'd from the library, where we've already sanitized the
* options.
*/
int flags = 0;
#else
int flags = MS_NOSUID | MS_NODEV;
#endif /* __SOLARIS__ */
char *optbuf;
char *mnt_opts = NULL;
const char *s;
char *d;
char *fsname = NULL;
char *subtype = NULL;
char *source = NULL;
char *type = NULL;
int check_empty = 1;
int blkdev = 0;
optbuf = (char *) malloc(strlen(opts) + 128);
if (!optbuf) {
fprintf(stderr, "%s: failed to allocate memory\n", progname);
return -1;
}
for (s = opts, d = optbuf; *s;) {
unsigned len;
const char *fsname_str = "fsname=";
const char *subtype_str = "subtype=";
for (len = 0; s[len] && s[len] != ','; len++);
if (begins_with(s, fsname_str)) {
if (!get_string_opt(s, len, fsname_str, &fsname))
goto err;
} else if (begins_with(s, subtype_str)) {
if (!get_string_opt(s, len, subtype_str, &subtype))
goto err;
} else if (opt_eq(s, len, "blkdev")) {
if (getuid() != 0) {
fprintf(stderr, "%s: option blkdev is privileged\n", progname);
goto err;
}
blkdev = 1;
} else if (opt_eq(s, len, "nonempty")) {
check_empty = 0;
} else if (!begins_with(s, "fd=") &&
!begins_with(s, "rootmode=") &&
!begins_with(s, "user_id=") &&
!begins_with(s, "group_id=")) {
int on;
int flag;
int skip_option = 0;
if (opt_eq(s, len, "large_read")) {
struct utsname utsname;
unsigned kmaj, kmin;
res = uname(&utsname);
if (res == 0 &&
sscanf(utsname.release, "%u.%u", &kmaj, &kmin) == 2 &&
(kmaj > 2 || (kmaj == 2 && kmin > 4))) {
fprintf(stderr, "%s: note: 'large_read' mount option is deprecated for %i.%i kernels\n", progname, kmaj, kmin);
skip_option = 1;
}
}
if (getuid() != 0 && !user_allow_other &&
(opt_eq(s, len, "allow_other") ||
opt_eq(s, len, "allow_root"))) {
fprintf(stderr, "%s: option %.*s only allowed if 'user_allow_other' is set in /etc/fuse.conf\n", progname, len, s);
goto err;
}
if (!skip_option) {
if (find_mount_flag(s, len, &on, &flag)) {
if (on)
flags |= flag;
else
flags &= ~flag;
} else {
memcpy(d, s, len);
d += len;
*d++ = ',';
}
}
}
s += len;
if (*s)
s++;
}
*d = '\0';
res = get_mnt_opts(flags, optbuf, &mnt_opts);
if (res == -1)
goto err;
sprintf(d, "fd=%i,rootmode=%o,user_id=%i,group_id=%i",
fd, rootmode, getuid(), getgid());
if (check_empty &&
fuse_mnt_check_empty(progname, mnt, rootmode, rootsize) == -1)
goto err;
source = malloc((fsname ? strlen(fsname) : 0) +
(subtype ? strlen(subtype) : 0) + strlen(dev) + 32);
type = malloc((subtype ? strlen(subtype) : 0) + 32);
if (!type || !source) {
fprintf(stderr, "%s: failed to allocate memory\n", progname);
goto err;
}
if (subtype)
sprintf(type, "%s.%s", blkdev ? "fuseblk" : "fuse", subtype);
else
strcpy(type, blkdev ? "fuseblk" : "fuse");
if (fsname)
strcpy(source, fsname);
else
strcpy(source, subtype ? subtype : dev);
#ifdef __SOLARIS__
res = mount(source, mnt, MS_OPTIONSTR|flags, type, NULL, 0,
optbuf, MAX_MNTOPT_STR);
#else
res = mount(source, mnt, type, flags, optbuf);
#endif /* __SOLARIS__ */
#ifdef __SOLARIS__
if (res == -1 && errno == EINVAL && subtype) {
#else
if (res == -1 && errno == ENODEV && subtype) {
#endif
/* Probably missing subtype support */
strcpy(type, blkdev ? "fuseblk" : "fuse");
if (fsname) {
if (!blkdev)
sprintf(source, "%s#%s", subtype, fsname);
} else {
strcpy(source, type);
}
#ifdef __SOLARIS__
res = mount(source, mnt, MS_OPTIONSTR|flags, type, NULL, 0,
optbuf, MAX_MNTOPT_STR);
#else
res = mount(source, mnt, type, flags, optbuf);
#endif /* __SOLARIS__ */
}
if (res == -1 && errno == EINVAL) {
/* It could be an old version not supporting group_id */
sprintf(d, "fd=%i,rootmode=%o,user_id=%i", fd, rootmode, getuid());
#ifdef __SOLARIS__
res = mount(dev, mnt, MS_OPTIONSTR|flags, type, NULL, 0,
optbuf, MAX_MNTOPT_STR);
#else
res = mount(source, mnt, type, flags, optbuf);
#endif /* __SOLARIS__ */
}
if (res == -1) {
int errno_save = errno;
if (blkdev && errno == ENODEV && !fuse_mnt_check_fuseblk())
fprintf(stderr, "%s: 'fuseblk' support missing\n", progname);
else
fprintf(stderr, "%s: mount failed: %s\n", progname, strerror(errno_save));
goto err;
} else {
*sourcep = source;
*typep = type;
*mnt_optsp = mnt_opts;
}
free(optbuf);
return res;
err:
free(fsname);
free(subtype);
free(source);
free(type);
free(mnt_opts);
free(optbuf);
return -1;
}
static int check_version(const char *dev)
{
int res;
int majorver;
int minorver;
const char *version_file;
FILE *vf;
if (strcmp(dev, FUSE_DEV_OLD) != 0)
return 0;
version_file = FUSE_VERSION_FILE_OLD;
vf = fopen(version_file, "r");
if (vf == NULL) {
fprintf(stderr, "%s: kernel interface too old\n", progname);
return -1;
}
res = fscanf(vf, "%i.%i", &majorver, &minorver);
fclose(vf);
if (res != 2) {
fprintf(stderr, "%s: error reading %s\n", progname, version_file);
return -1;
}
if (majorver < 3) {
fprintf(stderr, "%s: kernel interface too old\n", progname);
return -1;
}
return 0;
}
