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         {
"dirsync", MS_DIRSYNC,     1, 1},
   601 static int find_mount_flag(
const char *s, 
unsigned len, 
int *on, 
int *flag)
   605         for (i = 0; mount_flags[i].opt != NULL; i++) {
   606                 const char *opt = mount_flags[i].opt;
   607                 if (strlen(opt) == len && strncmp(opt, s, len) == 0) {
   608                         *on = mount_flags[i].on;
   609                         *flag = mount_flags[i].flag;
   610                         if (!mount_flags[i].safe && getuid() != 0) {
   613                                         "%s: unsafe option %s ignored\n",
   622 static int add_option(
char **optsp, 
const char *opt, 
unsigned expand)
   626                 newopts = strdup(opt);
   628                 unsigned oldsize = strlen(*optsp);
   629                 unsigned newsize = oldsize + 1 + strlen(opt) + expand + 1;
   630                 newopts = (
char *) realloc(*optsp, newsize);
   632                         sprintf(newopts + oldsize, 
",%s", opt);
   634         if (newopts == NULL) {
   635                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
   642 static int get_mnt_opts(
int flags, 
char *opts, 
char **mnt_optsp)
   647         if (!(flags & MS_RDONLY) && add_option(mnt_optsp, 
"rw", 0) == -1)
   650         for (i = 0; mount_flags[i].opt != NULL; i++) {
   651                 if (mount_flags[i].on && (flags & mount_flags[i].flag) &&
   652                     add_option(mnt_optsp, mount_flags[i].opt, 0) == -1)
   656         if (add_option(mnt_optsp, opts, 0) == -1)
   659         l = strlen(*mnt_optsp);
   660         if ((*mnt_optsp)[l-1] == 
',')
   661                 (*mnt_optsp)[l-1] = 
'\0';
   663                 const char *user = get_user_name();
   667                 if (add_option(mnt_optsp, 
"user=", strlen(user)) == -1)
   669                 strcat(*mnt_optsp, user);
   674 static int opt_eq(
const char *s, 
unsigned len, 
const char *opt)
   676         if(strlen(opt) == len && strncmp(s, opt, len) == 0)
   682 static int get_string_opt(
const char *s, 
unsigned len, 
const char *opt,
   686         unsigned opt_len = strlen(opt);
   691         *val = (
char *) malloc(len - opt_len + 1);
   693                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
   700         for (i = 0; i < len; i++) {
   701                 if (s[i] == 
'\\' && i + 1 < len)
   714 static int mount_notrunc(
const char *source, 
const char *target,
   715                          const char *filesystemtype, 
unsigned long mountflags,
   717         if (strlen(data) > sysconf(_SC_PAGESIZE) - 1) {
   718                 fprintf(stderr, 
"%s: mount options too long\n", progname);
   722         return mount(source, target, filesystemtype, mountflags, data);
   726 static int do_mount(
const char *mnt, 
const char **typep, mode_t rootmode,
   727                     int fd, 
const char *opts, 
const char *dev, 
char **sourcep,
   731         int flags = MS_NOSUID | MS_NODEV;
   733         char *mnt_opts = NULL;
   737         char *subtype = NULL;
   742         optbuf = (
char *) malloc(strlen(opts) + 128);
   744                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
   748         for (s = opts, d = optbuf; *s;) {
   750                 const char *fsname_str = 
"fsname=";
   751                 const char *subtype_str = 
"subtype=";
   752                 bool escape_ok = begins_with(s, fsname_str) ||
   753                                  begins_with(s, subtype_str);
   754                 for (len = 0; s[len]; len++) {
   755                         if (escape_ok && s[len] == 
'\\' && s[len + 1])
   757                         else if (s[len] == 
',')
   760                 if (begins_with(s, fsname_str)) {
   761                         if (!get_string_opt(s, len, fsname_str, &fsname))
   763                 } 
else if (begins_with(s, subtype_str)) {
   764                         if (!get_string_opt(s, len, subtype_str, &subtype))
   766                 } 
else if (opt_eq(s, len, 
"blkdev")) {
   769                                         "%s: option blkdev is privileged\n",
   774                 } 
else if (opt_eq(s, len, 
"auto_unmount")) {
   776                 } 
else if (!opt_eq(s, len, 
"nonempty") &&
   777                            !begins_with(s, 
"fd=") &&
   778                            !begins_with(s, 
"rootmode=") &&
   779                            !begins_with(s, 
"user_id=") &&
   780                            !begins_with(s, 
"group_id=")) {
   784                         if (opt_eq(s, len, 
"large_read")) {
   785                                 struct utsname utsname;
   787                                 res = uname(&utsname);
   789                                     sscanf(utsname.release, 
"%u.%u",
   790                                            &kmaj, &kmin) == 2 &&
   791                                     (kmaj > 2 || (kmaj == 2 && kmin > 4))) {
   792                                         fprintf(stderr, 
"%s: note: 'large_read' mount option is deprecated for %i.%i kernels\n", progname, kmaj, kmin);
   796                         if (getuid() != 0 && !user_allow_other &&
   797                             (opt_eq(s, len, 
"allow_other") ||
   798                              opt_eq(s, len, 
"allow_root"))) {
   799                                 fprintf(stderr, 
"%s: option %.*s only allowed if 'user_allow_other' is set in %s\n", progname, len, s, FUSE_CONF);
   803                                 if (find_mount_flag(s, len, &on, &flag)) {
   808                                 } 
else if (opt_eq(s, len, 
"default_permissions") ||
   809                                            opt_eq(s, len, 
"allow_other") ||
   810                                            begins_with(s, 
"max_read=") ||
   811                                            begins_with(s, 
"blksize=")) {
   816                                         fprintf(stderr, 
"%s: unknown option '%.*s'\n", progname, len, s);
   826         res = get_mnt_opts(flags, optbuf, &mnt_opts);
   830         sprintf(d, 
"fd=%i,rootmode=%o,user_id=%u,group_id=%u",
   831                 fd, rootmode, getuid(), getgid());
   833         source = malloc((fsname ? strlen(fsname) : 0) +
   834                         (subtype ? strlen(subtype) : 0) + strlen(dev) + 32);
   836         type = malloc((subtype ? strlen(subtype) : 0) + 32);
   837         if (!type || !source) {
   838                 fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
   843                 sprintf(type, 
"%s.%s", blkdev ? 
"fuseblk" : 
"fuse", subtype);
   845                 strcpy(type, blkdev ? 
"fuseblk" : 
"fuse");
   848                 strcpy(source, fsname);
   850                 strcpy(source, subtype ? subtype : dev);
   852         res = mount_notrunc(source, mnt, type, flags, optbuf);
   853         if (res == -1 && errno == ENODEV && subtype) {
   855                 strcpy(type, blkdev ? 
"fuseblk" : 
"fuse");
   858                                 sprintf(source, 
"%s#%s", subtype, fsname);
   860                         strcpy(source, type);
   863                 res = mount_notrunc(source, mnt, type, flags, optbuf);
   865         if (res == -1 && errno == EINVAL) {
   867                 sprintf(d, 
"fd=%i,rootmode=%o,user_id=%u",
   868                         fd, rootmode, getuid());
   869                 res = mount_notrunc(source, mnt, type, flags, optbuf);
   872                 int errno_save = errno;
   873                 if (blkdev && errno == ENODEV && !fuse_mnt_check_fuseblk())
   874                         fprintf(stderr, 
"%s: 'fuseblk' support missing\n",
   877                         fprintf(stderr, 
"%s: mount failed: %s\n", progname,
   878                                 strerror(errno_save));
   883         *mnt_optsp = mnt_opts;
   899 static int check_perm(
const char **mntp, 
struct stat *stbuf, 
int *mountpoint_fd)
   902         const char *mnt = *mntp;
   903         const char *origmnt = mnt;
   904         struct statfs fs_buf;
   907         res = lstat(mnt, stbuf);
   909                 fprintf(stderr, 
"%s: failed to access mountpoint %s: %s\n",
   910                         progname, mnt, strerror(errno));
   918         if (S_ISDIR(stbuf->st_mode)) {
   922                                 "%s: failed to chdir to mountpoint: %s\n",
   923                                 progname, strerror(errno));
   927                 res = lstat(mnt, stbuf);
   930                                 "%s: failed to access mountpoint %s: %s\n",
   931                                 progname, origmnt, strerror(errno));
   935                 if ((stbuf->st_mode & S_ISVTX) && stbuf->st_uid != getuid()) {
   936                         fprintf(stderr, 
"%s: mountpoint %s not owned by user\n",
   941                 res = access(mnt, W_OK);
   943                         fprintf(stderr, 
"%s: user has no write access to mountpoint %s\n",
   947         } 
else if (S_ISREG(stbuf->st_mode)) {
   948                 static char procfile[256];
   949                 *mountpoint_fd = open(mnt, O_WRONLY);
   950                 if (*mountpoint_fd == -1) {
   951                         fprintf(stderr, 
"%s: failed to open %s: %s\n",
   952                                 progname, mnt, strerror(errno));
   955                 res = fstat(*mountpoint_fd, stbuf);
   958                                 "%s: failed to access mountpoint %s: %s\n",
   959                                 progname, mnt, strerror(errno));
   962                 if (!S_ISREG(stbuf->st_mode)) {
   964                                 "%s: mountpoint %s is no longer a regular file\n",
   969                 sprintf(procfile, 
"/proc/self/fd/%i", *mountpoint_fd);
   973                         "%s: mountpoint %s is not a directory or a regular file\n",
   984         if (statfs(*mntp, &fs_buf)) {
   985                 fprintf(stderr, 
"%s: failed to access mountpoint %s: %s\n",
   986                         progname, mnt, strerror(errno));
   995         typeof(fs_buf.f_type) f_type_whitelist[] = {
  1025                 0x736675005346544e ,
  1029         for (i = 0; i < 
sizeof(f_type_whitelist)/
sizeof(f_type_whitelist[0]); i++) {
  1030                 if (f_type_whitelist[i] == fs_buf.f_type)
  1034         fprintf(stderr, 
"%s: mounting over filesystem type %#010lx is forbidden\n",
  1035                 progname, (
unsigned long)fs_buf.f_type);
  1039 static int try_open(
const char *dev, 
char **devp, 
int silent)
  1041         int fd = open(dev, O_RDWR);
  1043                 *devp = strdup(dev);
  1044                 if (*devp == NULL) {
  1045                         fprintf(stderr, 
"%s: failed to allocate memory\n",
  1050         } 
else if (errno == ENODEV ||
  1054                 fprintf(stderr, 
"%s: failed to open %s: %s\n", progname, dev,
  1060 static int try_open_fuse_device(
char **devp)
  1065         fd = try_open(FUSE_DEV, devp, 0);
  1070 static int open_fuse_device(
char **devp)
  1072         int fd = try_open_fuse_device(devp);
  1077                 "%s: fuse device not found, try 'modprobe fuse' first\n",
  1084 static int mount_fuse(
const char *mnt, 
const char *opts, 
const char **type)
  1090         char *source = NULL;
  1091         char *mnt_opts = NULL;
  1092         const char *real_mnt = mnt;
  1093         int mountpoint_fd = -1;
  1095         fd = open_fuse_device(&dev);
  1102         if (getuid() != 0 && mount_max != -1) {
  1103                 int mount_count = count_fuse_fs();
  1104                 if (mount_count >= mount_max) {
  1105                         fprintf(stderr, 
"%s: too many FUSE filesystems mounted; mount_max=N can be set in %s\n", progname, FUSE_CONF);
  1110         res = check_perm(&real_mnt, &stbuf, &mountpoint_fd);
  1113                 res = do_mount(real_mnt, type, stbuf.st_mode & S_IFMT,
  1114                                fd, opts, dev, &source, &mnt_opts);
  1116         if (mountpoint_fd != -1)
  1117                 close(mountpoint_fd);
  1124                 fprintf(stderr, 
"%s: failed to chdir to '/'\n", progname);
  1128         if (geteuid() == 0) {
  1129                 res = add_mount(source, mnt, *type, mnt_opts);
  1149 static int send_fd(
int sock_fd, 
int fd)
  1153         struct cmsghdr *p_cmsg;
  1155         size_t cmsgbuf[CMSG_SPACE(
sizeof(fd)) / 
sizeof(size_t)];
  1159         msg.msg_control = cmsgbuf;
  1160         msg.msg_controllen = 
sizeof(cmsgbuf);
  1161         p_cmsg = CMSG_FIRSTHDR(&msg);
  1162         p_cmsg->cmsg_level = SOL_SOCKET;
  1163         p_cmsg->cmsg_type = SCM_RIGHTS;
  1164         p_cmsg->cmsg_len = CMSG_LEN(
sizeof(fd));
  1165         p_fds = (
int *) CMSG_DATA(p_cmsg);
  1167         msg.msg_controllen = p_cmsg->cmsg_len;
  1168         msg.msg_name = NULL;
  1169         msg.msg_namelen = 0;
  1175         vec.iov_base = &sendchar;
  1176         vec.iov_len = 
sizeof(sendchar);
  1177         while ((retval = sendmsg(sock_fd, &msg, 0)) == -1 && errno == EINTR);
  1179                 perror(
"sending file descriptor");
  1201 static int should_auto_unmount(
const char *mnt, 
const char *type)
  1210         fprintf(stderr, 
"%s: failed to allocate memory\n", progname);
  1214         if (chdir_to_parent(copy, &last) == -1)
  1216         if (check_is_mount(last, mnt, type) == -1)
  1219         fd = open(mnt, O_RDONLY);
  1223                 result = errno == ENOTCONN;
  1230 static void usage(
void)
  1232         printf(
"%s: [options] mountpoint\n"  1235                " -V                 print version\n"  1236                " -o opt[,opt...]    mount options\n"  1239                " -z                 lazy unmount\n",
  1244 static void show_version(
void)
  1246         printf(
"fusermount3 version: %s\n", PACKAGE_VERSION);
  1250 int main(
int argc, 
char *argv[])
  1258         static int unmount = 0;
  1259         static int lazy = 0;
  1260         static int quiet = 0;
  1263         const char *opts = 
"";
  1264         const char *type = NULL;
  1266         static const struct option long_opts[] = {
  1267                 {
"unmount", no_argument, NULL, 
'u'},
  1268                 {
"lazy",    no_argument, NULL, 
'z'},
  1269                 {
"quiet",   no_argument, NULL, 
'q'},
  1270                 {
"help",    no_argument, NULL, 
'h'},
  1271                 {
"version", no_argument, NULL, 
'V'},
  1274         progname = strdup(argc > 0 ? argv[0] : 
"fusermount");
  1275         if (progname == NULL) {
  1276                 fprintf(stderr, 
"%s: failed to allocate memory\n", argv[0]);
  1280         while ((ch = getopt_long(argc, argv, 
"hVo:uzq", long_opts,
  1312         if (lazy && !unmount) {
  1313                 fprintf(stderr, 
"%s: -z can only be used with -u\n", progname);
  1317         if (optind >= argc) {
  1318                 fprintf(stderr, 
"%s: missing mountpoint argument\n", progname);
  1320         } 
else if (argc > optind + 1) {
  1321                 fprintf(stderr, 
"%s: extra arguments after the mountpoint\n",
  1326         origmnt = argv[optind];
  1329         mnt = fuse_mnt_resolve_path(progname, origmnt);
  1333                         fprintf(stderr, 
"%s: failed to chdir to '/'\n", progname);
  1345         commfd = getenv(FUSE_COMMFD_ENV);
  1346         if (commfd == NULL) {
  1347                 fprintf(stderr, 
"%s: old style mounting not supported\n",
  1352         fd = mount_fuse(mnt, opts, &type);
  1357         res = send_fd(cfd, fd);
  1362         if (!auto_unmount) {
  1374                 fprintf(stderr, 
"%s: failed to chdir to '/'\n", progname);
  1378         sigfillset(&sigset);
  1379         sigprocmask(SIG_BLOCK, &sigset, NULL);
  1385                 unsigned char buf[16];
  1386                 int n = recv(cfd, buf, 
sizeof(buf), 0);
  1397         if (!should_auto_unmount(mnt, type)) {
  1403                 res = unmount_fuse(mnt, quiet, lazy);
  1405                 res = umount2(mnt, lazy ? UMOUNT_DETACH : 0);
  1406                 if (res == -1 && !quiet)
  1408                                 "%s: failed to unmount %s: %s\n",
  1409                                 progname, mnt, strerror(errno));