11 #include "fuse_config.h" 
   12 #include "mount_util.h" 
   27 #include <sys/mount.h> 
   28 #include <sys/fsuid.h> 
   29 #include <sys/socket.h> 
   30 #include <sys/utsname.h> 
   35 #define FUSE_COMMFD_ENV         "_FUSE_COMMFD" 
   37 #define FUSE_DEV "/dev/fuse" 
   40 #define MS_DIRSYNC 128 
   46 #define MS_PRIVATE (1<<18) 
   50 #define UMOUNT_DETACH   0x00000002       
   52 #ifndef UMOUNT_NOFOLLOW 
   53 #define UMOUNT_NOFOLLOW 0x00000008       
   56 #define UMOUNT_UNUSED   0x80000000       
   59 static const char *progname;
 
   61 static int user_allow_other = 0;
 
   62 static int mount_max = 1000;
 
   64 static int auto_unmount = 0;
 
   66 static const char *get_user_name(
void)
 
   68         struct passwd *pw = getpwuid(getuid());
 
   69         if (pw != NULL && pw->pw_name != NULL)
 
   72                 fprintf(stderr, 
"%s: could not determine username\n", progname);
 
   77 static uid_t oldfsuid;
 
   78 static gid_t oldfsgid;
 
   80 static void drop_privs(
void)
 
   83                 oldfsuid = setfsuid(getuid());
 
   84                 oldfsgid = setfsgid(getgid());
 
   88 static void restore_privs(
void)
 
  100 static int lock_umount(
void)
 
  102         const char *mtab_lock = _PATH_MOUNTED 
".fuselock";
 
  105         struct stat mtab_stat;
 
  108         if (lstat(_PATH_MOUNTED, &mtab_stat) == 0 && S_ISLNK(mtab_stat.st_mode))
 
  111         mtablock = open(mtab_lock, O_RDWR | O_CREAT, 0600);
 
  112         if (mtablock == -1) {
 
  113                 fprintf(stderr, 
"%s: unable to open fuse lock file: %s\n",
 
  114                         progname, strerror(errno));
 
  117         res = lockf(mtablock, F_LOCK, 0);
 
  119                 fprintf(stderr, 
"%s: error getting lock: %s\n", progname,
 
  128 static void unlock_umount(
int mtablock)
 
  133                 res = lockf(mtablock, F_ULOCK, 0);
 
  135                         fprintf(stderr, 
"%s: error releasing lock: %s\n",
 
  136                                 progname, strerror(errno));
 
  142 static int add_mount(
const char *source, 
const char *mnt, 
const char *type,
 
  145         return fuse_mnt_add_mount(progname, source, mnt, type, opts);
 
  148 static int may_unmount(
const char *mnt, 
int quiet)
 
  152         const char *user = NULL;
 
  156         const char *mtab = _PATH_MOUNTED;
 
  158         user = get_user_name();
 
  162         fp = setmntent(mtab, 
"r");
 
  164                 fprintf(stderr, 
"%s: failed to open %s: %s\n", progname, mtab,
 
  169         uidlen = sprintf(uidstr, 
"%u", getuid());
 
  172         while ((entp = getmntent(fp)) != NULL) {
 
  173                 if (!found && strcmp(entp->mnt_dir, mnt) == 0 &&
 
  174                     (strcmp(entp->mnt_type, 
"fuse") == 0 ||
 
  175                      strcmp(entp->mnt_type, 
"fuseblk") == 0 ||
 
  176                      strncmp(entp->mnt_type, 
"fuse.", 5) == 0 ||
 
  177                      strncmp(entp->mnt_type, 
"fuseblk.", 8) == 0)) {
 
  178                         char *p = strstr(entp->mnt_opts, 
"user=");
 
  180                             (p == entp->mnt_opts || *(p-1) == 
',') &&
 
  181                             strcmp(p + 5, user) == 0) {
 
  188                                   strstr(entp->mnt_opts, 
"user_id=")) &&
 
  189                                  (p == entp->mnt_opts ||
 
  191                                  strncmp(p + 8, uidstr, uidlen) == 0 &&
 
  192                                  (*(p+8+uidlen) == 
',' ||
 
  193                                   *(p+8+uidlen) == 
'\0')) {
 
  204                                 "%s: entry for %s not found in %s\n",
 
  205                                 progname, mnt, mtab);
 
  236 static int check_is_mount_child(
void *p)
 
  239         const char *last = a[0];
 
  240         const char *mnt = a[1];
 
  241         const char *type = a[2];
 
  243         const char *procmounts = 
"/proc/mounts";
 
  249         res = mount(
"", 
"/", 
"", MS_PRIVATE | MS_REC, NULL);
 
  251                 fprintf(stderr, 
"%s: failed to mark mounts private: %s\n",
 
  252                         progname, strerror(errno));
 
  256         fp = setmntent(procmounts, 
"r");
 
  258                 fprintf(stderr, 
"%s: failed to open %s: %s\n", progname,
 
  259                         procmounts, strerror(errno));
 
  264         while (getmntent(fp) != NULL)
 
  268         fp = setmntent(procmounts, 
"r");
 
  270                 fprintf(stderr, 
"%s: failed to open %s: %s\n", progname,
 
  271                         procmounts, strerror(errno));
 
  275         res = mount(
".", 
"/", 
"", MS_BIND | MS_REC, NULL);
 
  277                 fprintf(stderr, 
"%s: failed to bind parent to /: %s\n",
 
  278                         progname, strerror(errno));
 
  283         while ((entp = getmntent(fp)) != NULL) {
 
  288                 if (entp->mnt_dir[0] == 
'/' &&
 
  289                     strcmp(entp->mnt_dir + 1, last) == 0 &&
 
  290                     (!type || strcmp(entp->mnt_type, type) == 0)) {
 
  298                 fprintf(stderr, 
"%s: %s not mounted\n", progname, mnt);
 
  305 static pid_t clone_newns(
void *a)
 
  308         char *stack = buf + (
sizeof(buf) / 2 - ((
size_t) buf & 15));
 
  311         extern int __clone2(
int (*fn)(
void *),
 
  312                             void *child_stack_base, 
size_t stack_size,
 
  313                             int flags, 
void *arg, pid_t *ptid,
 
  314                             void *tls, pid_t *ctid);
 
  316         return __clone2(check_is_mount_child, stack, 
sizeof(buf) / 2,
 
  317                         CLONE_NEWNS, a, NULL, NULL, NULL);
 
  319         return clone(check_is_mount_child, stack, CLONE_NEWNS, a);
 
  323 static int check_is_mount(
const char *last, 
const char *mnt, 
const char *type)
 
  327         const char *a[3] = { last, mnt, type };
 
  329         pid = clone_newns((
void *) a);
 
  330         if (pid == (pid_t) -1) {
 
  331                 fprintf(stderr, 
"%s: failed to clone namespace: %s\n",
 
  332                         progname, strerror(errno));
 
  335         p = waitpid(pid, &status, __WCLONE);
 
  336         if (p == (pid_t) -1) {
 
  337                 fprintf(stderr, 
"%s: waitpid failed: %s\n",
 
  338                         progname, strerror(errno));
 
  341         if (!WIFEXITED(status)) {
 
  342                 fprintf(stderr, 
"%s: child terminated abnormally (status %i)\n",
 
  346         if (WEXITSTATUS(status) != 0)
 
  352 static int chdir_to_parent(
char *copy, 
const char **lastp)
 
  359         tmp = strrchr(copy, 
'/');
 
  360         if (tmp == NULL || tmp[1] == 
'\0') {
 
  361                 fprintf(stderr, 
"%s: internal error: invalid abs path: <%s>\n",
 
  369         } 
else if (tmp[1] != 
'\0') {
 
  379                 fprintf(stderr, 
"%s: failed to chdir to %s: %s\n",
 
  380                         progname, parent, strerror(errno));
 
  384         if (getcwd(buf, 
sizeof(buf)) == NULL) {
 
  385                 fprintf(stderr, 
"%s: failed to obtain current directory: %s\n",
 
  386                         progname, strerror(errno));
 
  389         if (strcmp(buf, parent) != 0) {
 
  390                 fprintf(stderr, 
"%s: mountpoint moved (%s -> %s)\n", progname,
 
  400 static int unmount_fuse_locked(
const char *mnt, 
int quiet, 
int lazy)
 
  405         int umount_flags = (lazy ? UMOUNT_DETACH : 0) | UMOUNT_NOFOLLOW;
 
  408                 res = may_unmount(mnt, quiet);
 
  415                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
 
  420         res = chdir_to_parent(copy, &last);
 
  425         res = umount2(last, umount_flags);
 
  426         if (res == -1 && !quiet) {
 
  427                 fprintf(stderr, 
"%s: failed to unmount %s: %s\n",
 
  428                         progname, mnt, strerror(errno));
 
  438                 fprintf(stderr, 
"%s: failed to chdir to '/'\n", progname);
 
  442         return fuse_mnt_remove_mount(progname, mnt);
 
  445 static int unmount_fuse(
const char *mnt, 
int quiet, 
int lazy)
 
  448         int mtablock = lock_umount();
 
  450         res = unmount_fuse_locked(mnt, quiet, lazy);
 
  451         unlock_umount(mtablock);
 
  456 static int count_fuse_fs(
void)
 
  460         const char *mtab = _PATH_MOUNTED;
 
  461         FILE *fp = setmntent(mtab, 
"r");
 
  463                 fprintf(stderr, 
"%s: failed to open %s: %s\n", progname, mtab,
 
  467         while ((entp = getmntent(fp)) != NULL) {
 
  468                 if (strcmp(entp->mnt_type, 
"fuse") == 0 ||
 
  469                     strncmp(entp->mnt_type, 
"fuse.", 5) == 0)
 
  478 static int count_fuse_fs(
void)
 
  483 static int add_mount(
const char *source, 
const char *mnt, 
const char *type,
 
  493 static int unmount_fuse(
const char *mnt, 
int quiet, 
int lazy)
 
  496         return fuse_mnt_umount(progname, mnt, mnt, lazy);
 
  500 static void strip_line(
char *line)
 
  502         char *s = strchr(line, 
'#');
 
  505         for (s = line + strlen(line) - 1;
 
  506              s >= line && isspace((
unsigned char) *s); s--);
 
  508         for (s = line; isspace((
unsigned char) *s); s++);
 
  510                 memmove(line, s, strlen(s)+1);
 
  513 static void parse_line(
char *line, 
int linenum)
 
  516         if (strcmp(line, 
"user_allow_other") == 0)
 
  517                 user_allow_other = 1;
 
  518         else if (sscanf(line, 
"mount_max = %i", &tmp) == 1)
 
  522                         "%s: unknown parameter in %s at line %i: '%s'\n",
 
  523                         progname, FUSE_CONF, linenum, line);
 
  526 static void read_conf(
void)
 
  528         FILE *fp = fopen(FUSE_CONF, 
"r");
 
  533                 while (fgets(line, 
sizeof(line), fp) != NULL) {
 
  535                                 if (line[strlen(line)-1] == 
'\n') {
 
  537                                         parse_line(line, linenum);
 
  541                         } 
else if(line[strlen(line)-1] == 
'\n') {
 
  542                                 fprintf(stderr, 
"%s: reading %s: line %i too long\n", progname, FUSE_CONF, linenum);
 
  550                         fprintf(stderr, 
"%s: reading %s: missing newline at end of file\n", progname, FUSE_CONF);
 
  554                         fprintf(stderr, 
"%s: reading %s: read failed\n", progname, FUSE_CONF);
 
  558         } 
else if (errno != ENOENT) {
 
  559                 bool fatal = (errno != EACCES && errno != ELOOP &&
 
  560                               errno != ENAMETOOLONG && errno != ENOTDIR &&
 
  562                 fprintf(stderr, 
"%s: failed to open %s: %s\n",
 
  563                         progname, FUSE_CONF, strerror(errno));
 
  569 static int begins_with(
const char *s, 
const char *beg)
 
  571         if (strncmp(s, beg, strlen(beg)) == 0)
 
  584 static struct mount_flags mount_flags[] = {
 
  585         {
"rw",      MS_RDONLY,      0, 1},
 
  586         {
"ro",      MS_RDONLY,      1, 1},
 
  587         {
"suid",    MS_NOSUID,      0, 0},
 
  588         {
"nosuid",  MS_NOSUID,      1, 1},
 
  589         {
"dev",     MS_NODEV,       0, 0},
 
  590         {
"nodev",   MS_NODEV,       1, 1},
 
  591         {
"exec",    MS_NOEXEC,      0, 1},
 
  592         {
"noexec",  MS_NOEXEC,      1, 1},
 
  593         {
"async",   MS_SYNCHRONOUS, 0, 1},
 
  594         {
"sync",    MS_SYNCHRONOUS, 1, 1},
 
  595         {
"atime",   MS_NOATIME,     0, 1},
 
  596         {
"noatime", MS_NOATIME,     1, 1},
 
  597         {
"diratime",        MS_NODIRATIME,  0, 1},
 
  598         {
"nodiratime",      MS_NODIRATIME,  1, 1},
 
  599         {
"lazytime",        MS_LAZYTIME,    1, 1},
 
  600         {
"nolazytime",      MS_LAZYTIME,    0, 1},
 
  601         {
"relatime",        MS_RELATIME,    1, 1},
 
  602         {
"norelatime",      MS_RELATIME,    0, 1},
 
  603         {
"strictatime",     MS_STRICTATIME, 1, 1},
 
  604         {
"nostrictatime",   MS_STRICTATIME, 0, 1},
 
  605         {
"dirsync", MS_DIRSYNC,     1, 1},
 
  609 static int find_mount_flag(
const char *s, 
unsigned len, 
int *on, 
int *flag)
 
  613         for (i = 0; mount_flags[i].opt != NULL; i++) {
 
  614                 const char *opt = mount_flags[i].opt;
 
  615                 if (strlen(opt) == len && strncmp(opt, s, len) == 0) {
 
  616                         *on = mount_flags[i].on;
 
  617                         *flag = mount_flags[i].flag;
 
  618                         if (!mount_flags[i].safe && getuid() != 0) {
 
  621                                         "%s: unsafe option %s ignored\n",
 
  630 static int add_option(
char **optsp, 
const char *opt, 
unsigned expand)
 
  634                 newopts = strdup(opt);
 
  636                 unsigned oldsize = strlen(*optsp);
 
  637                 unsigned newsize = oldsize + 1 + strlen(opt) + expand + 1;
 
  638                 newopts = (
char *) realloc(*optsp, newsize);
 
  640                         sprintf(newopts + oldsize, 
",%s", opt);
 
  642         if (newopts == NULL) {
 
  643                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
 
  650 static int get_mnt_opts(
int flags, 
char *opts, 
char **mnt_optsp)
 
  655         if (!(flags & MS_RDONLY) && add_option(mnt_optsp, 
"rw", 0) == -1)
 
  658         for (i = 0; mount_flags[i].opt != NULL; i++) {
 
  659                 if (mount_flags[i].on && (flags & mount_flags[i].flag) &&
 
  660                     add_option(mnt_optsp, mount_flags[i].opt, 0) == -1)
 
  664         if (add_option(mnt_optsp, opts, 0) == -1)
 
  667         l = strlen(*mnt_optsp);
 
  668         if ((*mnt_optsp)[l-1] == 
',')
 
  669                 (*mnt_optsp)[l-1] = 
'\0';
 
  671                 const char *user = get_user_name();
 
  675                 if (add_option(mnt_optsp, 
"user=", strlen(user)) == -1)
 
  677                 strcat(*mnt_optsp, user);
 
  682 static int opt_eq(
const char *s, 
unsigned len, 
const char *opt)
 
  684         if(strlen(opt) == len && strncmp(s, opt, len) == 0)
 
  690 static int get_string_opt(
const char *s, 
unsigned len, 
const char *opt,
 
  694         unsigned opt_len = strlen(opt);
 
  699         *val = (
char *) malloc(len - opt_len + 1);
 
  701                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
 
  708         for (i = 0; i < len; i++) {
 
  709                 if (s[i] == 
'\\' && i + 1 < len)
 
  722 static int mount_notrunc(
const char *source, 
const char *target,
 
  723                          const char *filesystemtype, 
unsigned long mountflags,
 
  725         if (strlen(data) > sysconf(_SC_PAGESIZE) - 1) {
 
  726                 fprintf(stderr, 
"%s: mount options too long\n", progname);
 
  730         return mount(source, target, filesystemtype, mountflags, data);
 
  734 static int do_mount(
const char *mnt, 
const char **typep, mode_t rootmode,
 
  735                     int fd, 
const char *opts, 
const char *dev, 
char **sourcep,
 
  739         int flags = MS_NOSUID | MS_NODEV;
 
  741         char *mnt_opts = NULL;
 
  745         char *subtype = NULL;
 
  750         optbuf = (
char *) malloc(strlen(opts) + 128);
 
  752                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
 
  756         for (s = opts, d = optbuf; *s;) {
 
  758                 const char *fsname_str = 
"fsname=";
 
  759                 const char *subtype_str = 
"subtype=";
 
  760                 bool escape_ok = begins_with(s, fsname_str) ||
 
  761                                  begins_with(s, subtype_str);
 
  762                 for (len = 0; s[len]; len++) {
 
  763                         if (escape_ok && s[len] == 
'\\' && s[len + 1])
 
  765                         else if (s[len] == 
',')
 
  768                 if (begins_with(s, fsname_str)) {
 
  769                         if (!get_string_opt(s, len, fsname_str, &fsname))
 
  771                 } 
else if (begins_with(s, subtype_str)) {
 
  772                         if (!get_string_opt(s, len, subtype_str, &subtype))
 
  774                 } 
else if (opt_eq(s, len, 
"blkdev")) {
 
  777                                         "%s: option blkdev is privileged\n",
 
  782                 } 
else if (opt_eq(s, len, 
"auto_unmount")) {
 
  784                 } 
else if (!opt_eq(s, len, 
"nonempty") &&
 
  785                            !begins_with(s, 
"fd=") &&
 
  786                            !begins_with(s, 
"rootmode=") &&
 
  787                            !begins_with(s, 
"user_id=") &&
 
  788                            !begins_with(s, 
"group_id=")) {
 
  792                         if (opt_eq(s, len, 
"large_read")) {
 
  793                                 struct utsname utsname;
 
  795                                 res = uname(&utsname);
 
  797                                     sscanf(utsname.release, 
"%u.%u",
 
  798                                            &kmaj, &kmin) == 2 &&
 
  799                                     (kmaj > 2 || (kmaj == 2 && kmin > 4))) {
 
  800                                         fprintf(stderr, 
"%s: note: 'large_read' mount option is deprecated for %i.%i kernels\n", progname, kmaj, kmin);
 
  804                         if (getuid() != 0 && !user_allow_other &&
 
  805                             (opt_eq(s, len, 
"allow_other") ||
 
  806                              opt_eq(s, len, 
"allow_root"))) {
 
  807                                 fprintf(stderr, 
"%s: option %.*s only allowed if 'user_allow_other' is set in %s\n", progname, len, s, FUSE_CONF);
 
  811                                 if (find_mount_flag(s, len, &on, &flag)) {
 
  816                                 } 
else if (opt_eq(s, len, 
"default_permissions") ||
 
  817                                            opt_eq(s, len, 
"allow_other") ||
 
  818                                            begins_with(s, 
"max_read=") ||
 
  819                                            begins_with(s, 
"blksize=")) {
 
  824                                         fprintf(stderr, 
"%s: unknown option '%.*s'\n", progname, len, s);
 
  834         res = get_mnt_opts(flags, optbuf, &mnt_opts);
 
  838         sprintf(d, 
"fd=%i,rootmode=%o,user_id=%u,group_id=%u",
 
  839                 fd, rootmode, getuid(), getgid());
 
  841         source = malloc((fsname ? strlen(fsname) : 0) +
 
  842                         (subtype ? strlen(subtype) : 0) + strlen(dev) + 32);
 
  844         type = malloc((subtype ? strlen(subtype) : 0) + 32);
 
  845         if (!type || !source) {
 
  846                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
 
  851                 sprintf(type, 
"%s.%s", blkdev ? 
"fuseblk" : 
"fuse", subtype);
 
  853                 strcpy(type, blkdev ? 
"fuseblk" : 
"fuse");
 
  856                 strcpy(source, fsname);
 
  858                 strcpy(source, subtype ? subtype : dev);
 
  860         res = mount_notrunc(source, mnt, type, flags, optbuf);
 
  861         if (res == -1 && errno == ENODEV && subtype) {
 
  863                 strcpy(type, blkdev ? 
"fuseblk" : 
"fuse");
 
  866                                 sprintf(source, 
"%s#%s", subtype, fsname);
 
  868                         strcpy(source, type);
 
  871                 res = mount_notrunc(source, mnt, type, flags, optbuf);
 
  873         if (res == -1 && errno == EINVAL) {
 
  875                 sprintf(d, 
"fd=%i,rootmode=%o,user_id=%u",
 
  876                         fd, rootmode, getuid());
 
  877                 res = mount_notrunc(source, mnt, type, flags, optbuf);
 
  880                 int errno_save = errno;
 
  881                 if (blkdev && errno == ENODEV && !fuse_mnt_check_fuseblk())
 
  882                         fprintf(stderr, 
"%s: 'fuseblk' support missing\n",
 
  885                         fprintf(stderr, 
"%s: mount failed: %s\n", progname,
 
  886                                 strerror(errno_save));
 
  891         *mnt_optsp = mnt_opts;
 
  907 static int check_perm(
const char **mntp, 
struct stat *stbuf, 
int *mountpoint_fd)
 
  910         const char *mnt = *mntp;
 
  911         const char *origmnt = mnt;
 
  912         struct statfs fs_buf;
 
  915         res = lstat(mnt, stbuf);
 
  917                 fprintf(stderr, 
"%s: failed to access mountpoint %s: %s\n",
 
  918                         progname, mnt, strerror(errno));
 
  926         if (S_ISDIR(stbuf->st_mode)) {
 
  930                                 "%s: failed to chdir to mountpoint: %s\n",
 
  931                                 progname, strerror(errno));
 
  935                 res = lstat(mnt, stbuf);
 
  938                                 "%s: failed to access mountpoint %s: %s\n",
 
  939                                 progname, origmnt, strerror(errno));
 
  943                 if ((stbuf->st_mode & S_ISVTX) && stbuf->st_uid != getuid()) {
 
  944                         fprintf(stderr, 
"%s: mountpoint %s not owned by user\n",
 
  949                 res = access(mnt, W_OK);
 
  951                         fprintf(stderr, 
"%s: user has no write access to mountpoint %s\n",
 
  955         } 
else if (S_ISREG(stbuf->st_mode)) {
 
  956                 static char procfile[256];
 
  957                 *mountpoint_fd = open(mnt, O_WRONLY);
 
  958                 if (*mountpoint_fd == -1) {
 
  959                         fprintf(stderr, 
"%s: failed to open %s: %s\n",
 
  960                                 progname, mnt, strerror(errno));
 
  963                 res = fstat(*mountpoint_fd, stbuf);
 
  966                                 "%s: failed to access mountpoint %s: %s\n",
 
  967                                 progname, mnt, strerror(errno));
 
  970                 if (!S_ISREG(stbuf->st_mode)) {
 
  972                                 "%s: mountpoint %s is no longer a regular file\n",
 
  977                 sprintf(procfile, 
"/proc/self/fd/%i", *mountpoint_fd);
 
  981                         "%s: mountpoint %s is not a directory or a regular file\n",
 
  992         if (statfs(*mntp, &fs_buf)) {
 
  993                 fprintf(stderr, 
"%s: failed to access mountpoint %s: %s\n",
 
  994                         progname, mnt, strerror(errno));
 
 1003         typeof(fs_buf.f_type) f_type_whitelist[] = {
 
 1033                 0x736675005346544e ,
 
 1037         for (i = 0; i < 
sizeof(f_type_whitelist)/
sizeof(f_type_whitelist[0]); i++) {
 
 1038                 if (f_type_whitelist[i] == fs_buf.f_type)
 
 1042         fprintf(stderr, 
"%s: mounting over filesystem type %#010lx is forbidden\n",
 
 1043                 progname, (
unsigned long)fs_buf.f_type);
 
 1047 static int try_open(
const char *dev, 
char **devp, 
int silent)
 
 1049         int fd = open(dev, O_RDWR);
 
 1051                 *devp = strdup(dev);
 
 1052                 if (*devp == NULL) {
 
 1053                         fprintf(stderr, 
"%s: failed to allocate memory\n",
 
 1058         } 
else if (errno == ENODEV ||
 
 1062                 fprintf(stderr, 
"%s: failed to open %s: %s\n", progname, dev,
 
 1068 static int try_open_fuse_device(
char **devp)
 
 1073         fd = try_open(FUSE_DEV, devp, 0);
 
 1078 static int open_fuse_device(
char **devp)
 
 1080         int fd = try_open_fuse_device(devp);
 
 1085                 "%s: fuse device not found, try 'modprobe fuse' first\n",
 
 1092 static int mount_fuse(
const char *mnt, 
const char *opts, 
const char **type)
 
 1098         char *source = NULL;
 
 1099         char *mnt_opts = NULL;
 
 1100         const char *real_mnt = mnt;
 
 1101         int mountpoint_fd = -1;
 
 1103         fd = open_fuse_device(&dev);
 
 1110         if (getuid() != 0 && mount_max != -1) {
 
 1111                 int mount_count = count_fuse_fs();
 
 1112                 if (mount_count >= mount_max) {
 
 1113                         fprintf(stderr, 
"%s: too many FUSE filesystems mounted; mount_max=N can be set in %s\n", progname, FUSE_CONF);
 
 1118         res = check_perm(&real_mnt, &stbuf, &mountpoint_fd);
 
 1121                 res = do_mount(real_mnt, type, stbuf.st_mode & S_IFMT,
 
 1122                                fd, opts, dev, &source, &mnt_opts);
 
 1124         if (mountpoint_fd != -1)
 
 1125                 close(mountpoint_fd);
 
 1132                 fprintf(stderr, 
"%s: failed to chdir to '/'\n", progname);
 
 1136         if (geteuid() == 0) {
 
 1137                 res = add_mount(source, mnt, *type, mnt_opts);
 
 1157 static int send_fd(
int sock_fd, 
int fd)
 
 1161         struct cmsghdr *p_cmsg;
 
 1163         size_t cmsgbuf[CMSG_SPACE(
sizeof(fd)) / 
sizeof(size_t)];
 
 1167         msg.msg_control = cmsgbuf;
 
 1168         msg.msg_controllen = 
sizeof(cmsgbuf);
 
 1169         p_cmsg = CMSG_FIRSTHDR(&msg);
 
 1170         p_cmsg->cmsg_level = SOL_SOCKET;
 
 1171         p_cmsg->cmsg_type = SCM_RIGHTS;
 
 1172         p_cmsg->cmsg_len = CMSG_LEN(
sizeof(fd));
 
 1173         p_fds = (
int *) CMSG_DATA(p_cmsg);
 
 1175         msg.msg_controllen = p_cmsg->cmsg_len;
 
 1176         msg.msg_name = NULL;
 
 1177         msg.msg_namelen = 0;
 
 1183         vec.iov_base = &sendchar;
 
 1184         vec.iov_len = 
sizeof(sendchar);
 
 1185         while ((retval = sendmsg(sock_fd, &msg, 0)) == -1 && errno == EINTR);
 
 1187                 perror(
"sending file descriptor");
 
 1209 static int should_auto_unmount(
const char *mnt, 
const char *type)
 
 1218         fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
 
 1222         if (chdir_to_parent(copy, &last) == -1)
 
 1224         if (check_is_mount(last, mnt, type) == -1)
 
 1227         fd = open(mnt, O_RDONLY);
 
 1231                 result = errno == ENOTCONN;
 
 1238 static void usage(
void)
 
 1240         printf(
"%s: [options] mountpoint\n" 
 1243                " -V                 print version\n" 
 1244                " -o opt[,opt...]    mount options\n" 
 1247                " -z                 lazy unmount\n",
 
 1252 static void show_version(
void)
 
 1254         printf(
"fusermount3 version: %s\n", PACKAGE_VERSION);
 
 1258 int main(
int argc, 
char *argv[])
 
 1266         static int unmount = 0;
 
 1267         static int lazy = 0;
 
 1268         static int quiet = 0;
 
 1271         const char *opts = 
"";
 
 1272         const char *type = NULL;
 
 1274         static const struct option long_opts[] = {
 
 1275                 {
"unmount", no_argument, NULL, 
'u'},
 
 1276                 {
"lazy",    no_argument, NULL, 
'z'},
 
 1277                 {
"quiet",   no_argument, NULL, 
'q'},
 
 1278                 {
"help",    no_argument, NULL, 
'h'},
 
 1279                 {
"version", no_argument, NULL, 
'V'},
 
 1282         progname = strdup(argc > 0 ? argv[0] : 
"fusermount");
 
 1283         if (progname == NULL) {
 
 1284                 fprintf(stderr, 
"%s: failed to allocate memory\n", argv[0]);
 
 1288         while ((ch = getopt_long(argc, argv, 
"hVo:uzq", long_opts,
 
 1320         if (lazy && !unmount) {
 
 1321                 fprintf(stderr, 
"%s: -z can only be used with -u\n", progname);
 
 1325         if (optind >= argc) {
 
 1326                 fprintf(stderr, 
"%s: missing mountpoint argument\n", progname);
 
 1328         } 
else if (argc > optind + 1) {
 
 1329                 fprintf(stderr, 
"%s: extra arguments after the mountpoint\n",
 
 1334         origmnt = argv[optind];
 
 1337         mnt = fuse_mnt_resolve_path(progname, origmnt);
 
 1341                         fprintf(stderr, 
"%s: failed to chdir to '/'\n", progname);
 
 1353         commfd = getenv(FUSE_COMMFD_ENV);
 
 1354         if (commfd == NULL) {
 
 1355                 fprintf(stderr, 
"%s: old style mounting not supported\n",
 
 1360         fd = mount_fuse(mnt, opts, &type);
 
 1365         res = send_fd(cfd, fd);
 
 1370         if (!auto_unmount) {
 
 1382                 fprintf(stderr, 
"%s: failed to chdir to '/'\n", progname);
 
 1386         sigfillset(&sigset);
 
 1387         sigprocmask(SIG_BLOCK, &sigset, NULL);
 
 1393                 unsigned char buf[16];
 
 1394                 int n = recv(cfd, buf, 
sizeof(buf), 0);
 
 1405         if (!should_auto_unmount(mnt, type)) {
 
 1411                 res = unmount_fuse(mnt, quiet, lazy);
 
 1413                 res = umount2(mnt, lazy ? UMOUNT_DETACH : 0);
 
 1414                 if (res == -1 && !quiet)
 
 1416                                 "%s: failed to unmount %s: %s\n",
 
 1417                                 progname, mnt, strerror(errno));