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* Copyright (C) 1995-1998 by Volker Lendecke
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#include <asm/types.h>
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#include <asm/posix_types.h>
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#include <linux/smb.h>
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#include <linux/smb_mount.h>
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#include <linux/smb_fs.h>
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/* This is a (hopefully) temporary hack due to the fact that
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sizeof( uid_t ) != sizeof( __kernel_uid_t ) under glibc.
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This may change in the future and smb.h may get fixed in the
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future. In the mean time, it's ugly hack time - get over it.
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#undef SMB_IOC_GETMOUNTUID
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#define SMB_IOC_GETMOUNTUID _IOR('u', 1, __kernel_uid_t)
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#define O_NOFOLLOW 0400000
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printf("usage: smbumount mountpoint\n");
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umount_ok(const char *mount_point)
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/* we set O_NOFOLLOW to prevent users playing games with symlinks to
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umount filesystems they don't own */
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int fid = open(mount_point, O_RDONLY|O_NOFOLLOW, 0);
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__kernel_uid_t mount_uid;
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fprintf(stderr, "Could not open %s: %s\n",
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mount_point, strerror(errno));
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if (ioctl(fid, SMB_IOC_GETMOUNTUID, &mount_uid) != 0) {
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fprintf(stderr, "%s probably not smb-filesystem\n",
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&& (mount_uid != getuid())) {
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fprintf(stderr, "You are not allowed to umount %s\n",
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/* Make a canonical pathname from PATH. Returns a freshly malloced string.
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It is up the *caller* to ensure that the PATH is sensible. i.e.
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canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.''
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is not a legal pathname for ``/dev/fd0'' Anything we cannot parse
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we return unmodified. */
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canonicalize (char *path)
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char *canonical = malloc (PATH_MAX + 1);
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fprintf(stderr, "Error! Not enough memory!\n");
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if (strlen(path) > PATH_MAX) {
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fprintf(stderr, "Mount point string too long\n");
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if (realpath (path, canonical))
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strncpy (canonical, path, PATH_MAX);
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canonical[PATH_MAX] = '\0';
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main(int argc, char *argv[])
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if (geteuid() != 0) {
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fprintf(stderr, "smbumount must be installed suid root\n");
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mount_point = canonicalize(argv[1]);
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if (mount_point == NULL)
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if (umount_ok(mount_point) != 0) {
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if (umount(mount_point) != 0) {
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fprintf(stderr, "Could not umount %s: %s\n",
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mount_point, strerror(errno));
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if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
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fprintf(stderr, "Can't get "MOUNTED"~ lock file");
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if ((mtab = setmntent(MOUNTED, "r")) == NULL) {
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fprintf(stderr, "Can't open " MOUNTED ": %s\n",
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#define MOUNTED_TMP MOUNTED".tmp"
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if ((new_mtab = setmntent(MOUNTED_TMP, "w")) == NULL) {
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fprintf(stderr, "Can't open " MOUNTED_TMP ": %s\n",
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while ((mnt = getmntent(mtab)) != NULL) {
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if (strcmp(mnt->mnt_dir, mount_point) != 0) {
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addmntent(new_mtab, mnt);
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if (fchmod (fileno (new_mtab), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) < 0) {
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fprintf(stderr, "Error changing mode of %s: %s\n",
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MOUNTED_TMP, strerror(errno));
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if (rename(MOUNTED_TMP, MOUNTED) < 0) {
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fprintf(stderr, "Cannot rename %s to %s: %s\n",
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MOUNTED, MOUNTED_TMP, strerror(errno));
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if (unlink(MOUNTED"~") == -1)
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fprintf(stderr, "Can't remove "MOUNTED"~");