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 fuse_helper_opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs)
{
struct helper_opts *hopts = data;
switch (key) {
case KEY_HELP:
usage(outargs->argv[0]);
/* fall through */
case KEY_HELP_NOHEADER:
helper_help();
return fuse_opt_add_arg(outargs, "-h");
case KEY_VERSION:
helper_version();
return 1;
case FUSE_OPT_KEY_NONOPT:
if (!hopts->mountpoint) {
char mountpoint[PATH_MAX];
if (realpath(arg, mountpoint) == NULL) {
fprintf(stderr, "fuse: bad mount point `%s': %s\n", arg, strerror(errno));
return -1;
}
return fuse_opt_add_opt(&hopts->mountpoint, mountpoint);
} else {
fprintf(stderr, "fuse: invalid argument `%s'\n", arg);
return -1;
}
default:
return 1;
}
}
int fuse_kern_mount(const char *mountpoint, struct fuse_args *args)
{
struct mount_opts mo;
int res = -1;
char *mnt_opts = NULL;
memset(&mo, 0, sizeof(mo));
if (getuid())
mo.flags = MS_NOSUID | MS_NODEV;
if (args &&
fuse_opt_parse(args, &mo, fuse_mount_opts, fuse_mount_opt_proc) == -1)
return -1;
if (mo.allow_other && mo.allow_root) {
fprintf(stderr, "fuse: 'allow_other' and 'allow_root' options are mutually exclusive\n");
goto out;
}
res = 0;
if (mo.ishelp)
goto out;
res = -1;
if (get_mnt_flag_opts(&mnt_opts, mo.flags) == -1)
goto out;
if (!(mo.flags & MS_NODEV) && fuse_opt_add_opt(&mnt_opts, "dev") == -1)
goto out;
if (!(mo.flags & MS_NOSUID) && fuse_opt_add_opt(&mnt_opts, "suid") == -1)
goto out;
if (mo.kernel_opts && fuse_opt_add_opt(&mnt_opts, mo.kernel_opts) == -1)
goto out;
if (mo.mtab_opts && fuse_opt_add_opt(&mnt_opts, mo.mtab_opts) == -1)
goto out;
if (mo.fusermount_opts && fuse_opt_add_opt(&mnt_opts, mo.fusermount_opts) < 0)
goto out;
res = fusermount(0, 0, 0, mnt_opts ? mnt_opts : "", mountpoint);
out:
free(mnt_opts);
free(mo.fsname);
free(mo.fusermount_opts);
free(mo.kernel_opts);
free(mo.mtab_opts);
return res;
}
static int fuse_mount_opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs)
{
struct mount_opts *mo = data;
switch (key) {
case KEY_ALLOW_ROOT:
if (fuse_opt_add_opt(&mo->kernel_opts, "allow_other") == -1 ||
fuse_opt_add_arg(outargs, "-oallow_root") == -1)
return -1;
return 0;
case KEY_RO:
arg = "ro";
/* fall through */
case KEY_KERN_FLAG:
set_mount_flag(arg, &mo->flags);
return 0;
case KEY_KERN_OPT:
return fuse_opt_add_opt(&mo->kernel_opts, arg);
case KEY_FUSERMOUNT_OPT:
return fuse_opt_add_opt(&mo->fusermount_opts, arg);
case KEY_SUBTYPE_OPT:
return fuse_opt_add_opt(&mo->subtype_opt, arg);
case KEY_MTAB_OPT:
return fuse_opt_add_opt(&mo->mtab_opts, arg);
case KEY_HELP:
mount_help();
mo->ishelp = 1;
break;
case KEY_VERSION:
mount_version();
mo->ishelp = 1;
break;
}
return 1;
}
int SMTPFileSystem::SMTPFileSystemOptions::opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs)
{
SMTPFileSystemOptions *options = static_cast<SMTPFileSystemOptions*>(data);
if (key == FUSE_OPT_KEY_NONOPT) {
if (options->m_mount_point && options->m_device_file) {
// Unknown positional argument supplied
return -1;
}
if (options->m_device_file) {
fuse_opt_add_opt(&options->m_mount_point, arg);
return 0;
}
fuse_opt_add_opt(&options->m_device_file, arg);
return 0;
}
return 1;
}
static int fuse_helper_opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs)
{
struct helper_opts *hopts = data;
switch (key) {
case KEY_HELP:
usage(outargs->argv[0]);
/* fall through */
case KEY_HELP_NOHEADER:
helper_help();
return fuse_opt_add_arg(outargs, "-h");
case KEY_VERSION:
helper_version();
return 1;
case FUSE_OPT_KEY_NONOPT:
if (!hopts->mountpoint) {
char mountpoint[PATH_MAX];
if (realpath(arg, mountpoint) == NULL) {
fprintf(stderr,
"fuse: bad mount point `%s': %s\n",
arg, strerror(errno));
return -1;
}
#ifdef __APPLE__
else {
struct stat sb;
if (stat(mountpoint, &sb) != 0) {
fprintf(stderr,
"fuse: failed to stat mount point `%s': %s\n",
mountpoint, strerror(errno));
return -1;
}
if ((sb.st_mode & S_IFMT) != S_IFDIR) {
fprintf(stderr,
"fuse: mount point is not a directory `%s'\n",
mountpoint);
return -1;
}
}
#endif
return fuse_opt_add_opt(&hopts->mountpoint, mountpoint);
} else {
fprintf(stderr, "fuse: invalid argument `%s'\n", arg);
return -1;
}
default:
return 1;
}
}
static int add_opt(struct fuse_opt_context *ctx, const char *opt)
{
return fuse_opt_add_opt(&ctx->opts, opt);
}
int fuse_kern_mount(const char *mountpoint, struct fuse_args *args)
{
struct mount_opts mo;
int res = -1;
char *mnt_opts = NULL;
#ifdef __SOLARIS__
struct solaris_mount_opts smo;
struct fuse_args sa = FUSE_ARGS_INIT(0, NULL);
#endif /* __SOLARIS__ */
memset(&mo, 0, sizeof(mo));
#ifdef __SOLARIS__
mo.flags = 0;
memset(&smo, 0, sizeof(smo));
if (args != NULL) {
while (args->argv[sa.argc] != NULL)
fuse_opt_add_arg(&sa, args->argv[sa.argc]);
}
#else
mo.flags = MS_NOSUID | MS_NODEV;
#endif /* __SOLARIS__ */
if (args &&
fuse_opt_parse(args, &mo, fuse_mount_opts, fuse_mount_opt_proc) == -1)
goto out; /* if SOLARIS, clean up 'sa' */
#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. So we parse the existing options, then
* add restrictive defaults if needed.
*/
if (fuse_opt_parse(&sa, &smo, solaris_mnt_opts, NULL) == -1)
goto out;
if (smo.nosuid || (!smo.nodevices && !smo.devices
&& !smo.nosetuid && !smo.setuid)) {
mo.flags |= MS_NOSUID;
} else {
/*
* Defaults; if neither nodevices|devices,nosetuid|setuid has
* been specified, add the default negative option string. If
* both have been specified (i.e., -osuid,nosuid), leave them
* alone; the last option will have precedence.
*/
if (!smo.nodevices && !smo.devices)
if (fuse_opt_add_opt(&mo.kernel_opts, "nodevices") == -1)
goto out;
if (!smo.nosetuid && !smo.setuid)
if (fuse_opt_add_opt(&mo.kernel_opts, "nosetuid") == -1)
goto out;
}
#endif /* __SOLARIS__ */
if (mo.allow_other && mo.allow_root) {
fprintf(stderr, "fuse: 'allow_other' and 'allow_root' options are mutually exclusive\n");
goto out;
}
res = 0;
if (mo.ishelp)
goto out;
res = -1;
if (get_mnt_flag_opts(&mnt_opts, mo.flags) == -1)
goto out;
if (mo.kernel_opts && fuse_opt_add_opt(&mnt_opts, mo.kernel_opts) == -1)
goto out;
if (mo.mtab_opts && fuse_opt_add_opt(&mnt_opts, mo.mtab_opts) == -1)
goto out;
res = fuse_mount_sys(mountpoint, &mo, mnt_opts);
if (res == -2) {
if (mo.fusermount_opts &&
fuse_opt_add_opt(&mnt_opts, mo.fusermount_opts) == -1)
goto out;
if (mo.subtype) {
char *tmp_opts = NULL;
res = -1;
if (fuse_opt_add_opt(&tmp_opts, mnt_opts) == -1 ||
fuse_opt_add_opt(&tmp_opts, mo.subtype_opt) == -1) {
free(tmp_opts);
goto out;
}
res = fuse_mount_fusermount(mountpoint, tmp_opts, 1);
free(tmp_opts);
if (res == -1)
res = fuse_mount_fusermount(mountpoint, mnt_opts, 0);
} else {
res = fuse_mount_fusermount(mountpoint, mnt_opts, 0);
}
}
out:
#ifdef __SOLARIS__
fuse_opt_free_args(&sa);
#endif /* __SOLARIS__ */
free(mnt_opts);
free(mo.fsname);
free(mo.subtype);
free(mo.fusermount_opts);
free(mo.subtype_opt);
free(mo.kernel_opts);
free(mo.mtab_opts);
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;
}
int fuse_kern_mount(const char *mountpoint, struct fuse_args *args)
{
struct mount_opts mo;
int res = -1;
char *mnt_opts = NULL;
memset(&mo, 0, sizeof(mo));
mo.flags = MS_NOSUID | MS_NODEV;
if (args &&
fuse_opt_parse(args, &mo, fuse_mount_opts, fuse_mount_opt_proc) == -1)
return -1;
if (mo.allow_other && mo.allow_root) {
fprintf(stderr, "fuse: 'allow_other' and 'allow_root' options are mutually exclusive\n");
goto out;
}
res = 0;
if (mo.ishelp)
goto out;
res = -1;
if (get_mnt_flag_opts(&mnt_opts, mo.flags) == -1)
goto out;
if (mo.kernel_opts && fuse_opt_add_opt(&mnt_opts, mo.kernel_opts) == -1)
goto out;
if (mo.mtab_opts && fuse_opt_add_opt(&mnt_opts, mo.mtab_opts) == -1)
goto out;
res = fuse_mount_sys(mountpoint, &mo, mnt_opts);
if (res == -2) {
if (mo.fusermount_opts &&
fuse_opt_add_opt(&mnt_opts, mo.fusermount_opts) == -1)
goto out;
if (mo.subtype) {
char *tmp_opts = NULL;
res = -1;
if (fuse_opt_add_opt(&tmp_opts, mnt_opts) == -1 ||
fuse_opt_add_opt(&tmp_opts, mo.subtype_opt) == -1) {
free(tmp_opts);
goto out;
}
res = fuse_mount_fusermount(mountpoint, &mo, tmp_opts, 1);
free(tmp_opts);
if (res == -1)
res = fuse_mount_fusermount(mountpoint, &mo,
mnt_opts, 0);
} else {
res = fuse_mount_fusermount(mountpoint, &mo, mnt_opts, 0);
}
}
out:
free(mnt_opts);
free(mo.fsname);
free(mo.subtype);
free(mo.fusermount_opts);
free(mo.subtype_opt);
free(mo.kernel_opts);
free(mo.mtab_opts);
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 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;
}
