mirror of
https://github.com/samba-team/samba.git
synced 2024-12-23 17:34:34 +03:00
5e54558c6d
(This used to be commit b0132e94fc
)
380 lines
8.9 KiB
C
380 lines
8.9 KiB
C
/*
|
|
Unmount utility program for Linux CIFS VFS (virtual filesystem) client
|
|
Copyright (C) 2005 Steve French (sfrench@us.ibm.com)
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <ctype.h>
|
|
#include <sys/types.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/vfs.h>
|
|
#include <fcntl.h>
|
|
#include <getopt.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <mntent.h>
|
|
|
|
#define UNMOUNT_CIFS_VERSION_MAJOR "0"
|
|
#define UNMOUNT_CIFS_VERSION_MINOR "5"
|
|
|
|
#ifndef UNMOUNT_CIFS_VENDOR_SUFFIX
|
|
#ifdef _SAMBA_BUILD_
|
|
#include "include/version.h"
|
|
#ifdef SAMBA_VERSION_VENDOR_SUFFIX
|
|
#define UNMOUNT_CIFS_VENDOR_SUFFIX "-"SAMBA_VERSION_OFFICIAL_STRING"-"SAMBA_VERSION_VENDOR_SUFFIX
|
|
#else
|
|
#define UNMOUNT_CIFS_VENDOR_SUFFIX "-"SAMBA_VERSION_OFFICIAL_STRING
|
|
#endif /* SAMBA_VERSION_OFFICIAL_STRING and SAMBA_VERSION_VENDOR_SUFFIX */
|
|
#else
|
|
#define UNMOUNT_CIFS_VENDOR_SUFFIX ""
|
|
#endif /* _SAMBA_BUILD_ */
|
|
#endif /* UNMOUNT_CIFS_VENDOR_SUFFIX */
|
|
|
|
#ifndef MNT_DETACH
|
|
#define MNT_DETACH 0x02
|
|
#endif
|
|
|
|
#ifndef MNT_EXPIRE
|
|
#define MNT_EXPIRE 0x04
|
|
#endif
|
|
|
|
#ifndef MOUNTED_LOCK
|
|
#define MOUNTED_LOCK "/etc/mtab~"
|
|
#endif
|
|
#ifndef MOUNTED_TEMP
|
|
#define MOUNTED_TEMP "/etc/mtab.tmp"
|
|
#endif
|
|
|
|
#define CIFS_IOC_CHECKUMOUNT _IO(0xCF, 2)
|
|
#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDU */
|
|
|
|
static struct option longopts[] = {
|
|
{ "all", 0, NULL, 'a' },
|
|
{ "help",0, NULL, 'h' },
|
|
{ "read-only", 0, NULL, 'r' },
|
|
{ "ro", 0, NULL, 'r' },
|
|
{ "verbose", 0, NULL, 'v' },
|
|
{ "version", 0, NULL, 'V' },
|
|
{ "expire", 0, NULL, 'e' },
|
|
{ "force", 0, 0, 'f' },
|
|
{ "lazy", 0, 0, 'l' },
|
|
{ "no-mtab", 0, 0, 'n' },
|
|
{ NULL, 0, NULL, 0 }
|
|
};
|
|
|
|
const char * thisprogram;
|
|
int verboseflg = 0;
|
|
|
|
static void umount_cifs_usage(void)
|
|
{
|
|
printf("\nUsage: %s <remotetarget> <dir>\n", thisprogram);
|
|
printf("\nUnmount the specified directory\n");
|
|
printf("\nLess commonly used options:");
|
|
printf("\n\t-r\tIf mount fails, retry with readonly remount.");
|
|
printf("\n\t-n\tDo not write to mtab.");
|
|
printf("\n\t-f\tAttempt a forced unmount, even if the fs is busy.");
|
|
printf("\n\t-l\tAttempt lazy unmount, Unmount now, cleanup later.");
|
|
printf("\n\t-v\tEnable verbose mode (may be useful for debugging).");
|
|
printf("\n\t-h\tDisplay this help.");
|
|
printf("\n\nOptions are described in more detail in the manual page");
|
|
printf("\n\tman 8 umount.cifs\n");
|
|
printf("\nTo display the version number of the cifs umount utility:");
|
|
printf("\n\t%s -V\n",thisprogram);
|
|
printf("\nInvoking the umount utility on cifs mounts, can execute");
|
|
printf(" /sbin/umount.cifs (if present and umount -i is not specified.\n");
|
|
}
|
|
|
|
static int umount_check_perm(char * dir)
|
|
{
|
|
int fileid;
|
|
int rc;
|
|
|
|
/* allow root to unmount, no matter what */
|
|
if(getuid() == 0)
|
|
return 0;
|
|
|
|
/* presumably can not chdir into the target as we do on mount */
|
|
fileid = open(dir, O_RDONLY | O_DIRECTORY | O_NOFOLLOW, 0);
|
|
if(fileid == -1) {
|
|
if(verboseflg)
|
|
printf("error opening mountpoint %d %s",errno,strerror(errno));
|
|
return errno;
|
|
}
|
|
|
|
rc = ioctl(fileid, CIFS_IOC_CHECKUMOUNT, NULL);
|
|
|
|
if(verboseflg)
|
|
printf("ioctl returned %d with errno %d %s\n",rc,errno,strerror(errno));
|
|
|
|
if(rc == ENOTTY) {
|
|
printf("user unmounting via %s is an optional feature of",thisprogram);
|
|
printf(" the cifs filesystem driver (cifs.ko)");
|
|
printf("\n\tand requires cifs.ko version 1.32 or later\n");
|
|
} else if (rc > 0)
|
|
printf("user unmount of %s failed with %d %s\n",dir,errno,strerror(errno));
|
|
close(fileid);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int lock_mtab(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = mknod(MOUNTED_LOCK , 0600, 0);
|
|
if(rc == -1)
|
|
printf("\ngetting lock file %s failed with %s\n",MOUNTED_LOCK,
|
|
strerror(errno));
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
static void unlock_mtab(void)
|
|
{
|
|
unlink(MOUNTED_LOCK);
|
|
}
|
|
|
|
static int remove_from_mtab(char * mountpoint)
|
|
{
|
|
int rc;
|
|
int num_matches;
|
|
FILE * org_fd;
|
|
FILE * new_fd;
|
|
struct mntent * mount_entry;
|
|
|
|
/* Do we need to check if it is a symlink to e.g. /proc/mounts
|
|
in which case we probably do not want to update it? */
|
|
|
|
/* Do we first need to check if it is writable? */
|
|
|
|
if (lock_mtab()) {
|
|
printf("Mount table locked\n");
|
|
return -EACCES;
|
|
}
|
|
|
|
if(verboseflg)
|
|
printf("attempting to remove from mtab\n");
|
|
|
|
org_fd = setmntent(MOUNTED, "r");
|
|
|
|
if(org_fd == NULL) {
|
|
printf("Can not open %s\n",MOUNTED);
|
|
unlock_mtab();
|
|
return -EIO;
|
|
}
|
|
|
|
new_fd = setmntent(MOUNTED_TEMP,"w");
|
|
if(new_fd == NULL) {
|
|
printf("Can not open temp file %s", MOUNTED_TEMP);
|
|
endmntent(org_fd);
|
|
unlock_mtab();
|
|
return -EIO;
|
|
}
|
|
|
|
/* BB fix so we only remove the last entry that matches BB */
|
|
num_matches = 0;
|
|
while((mount_entry = getmntent(org_fd)) != NULL) {
|
|
if(strcmp(mount_entry->mnt_dir, mountpoint) == 0) {
|
|
num_matches++;
|
|
}
|
|
}
|
|
if(verboseflg)
|
|
printf("%d matching entries in mount table\n", num_matches);
|
|
|
|
/* Is there a better way to seek back to the first entry in mtab? */
|
|
endmntent(org_fd);
|
|
org_fd = setmntent(MOUNTED, "r");
|
|
|
|
if(org_fd == NULL) {
|
|
printf("Can not open %s\n",MOUNTED);
|
|
unlock_mtab();
|
|
return -EIO;
|
|
}
|
|
|
|
while((mount_entry = getmntent(org_fd)) != NULL) {
|
|
if(strcmp(mount_entry->mnt_dir, mountpoint) != 0) {
|
|
addmntent(new_fd, mount_entry);
|
|
} else {
|
|
if(num_matches != 1) {
|
|
addmntent(new_fd, mount_entry);
|
|
num_matches--;
|
|
} else if(verboseflg)
|
|
printf("entry not copied (ie entry is removed)\n");
|
|
}
|
|
}
|
|
|
|
if(verboseflg)
|
|
printf("done updating tmp file\n");
|
|
rc = fchmod (fileno (new_fd), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
|
|
if(rc < 0) {
|
|
printf("error %s changing mode of %s\n", strerror(errno),
|
|
MOUNTED_TEMP);
|
|
}
|
|
endmntent(new_fd);
|
|
|
|
rc = rename(MOUNTED_TEMP, MOUNTED);
|
|
|
|
if(rc < 0) {
|
|
printf("failure %s renaming %s to %s\n",strerror(errno),
|
|
MOUNTED_TEMP, MOUNTED);
|
|
unlock_mtab();
|
|
return -EIO;
|
|
}
|
|
|
|
unlock_mtab();
|
|
|
|
return rc;
|
|
}
|
|
|
|
int main(int argc, char ** argv)
|
|
{
|
|
int c;
|
|
int rc;
|
|
int flags = 0;
|
|
int nomtab = 0;
|
|
int retry_remount = 0;
|
|
struct statfs statbuf;
|
|
char * mountpoint;
|
|
|
|
if(argc && argv) {
|
|
thisprogram = argv[0];
|
|
} else {
|
|
umount_cifs_usage();
|
|
return -EINVAL;
|
|
}
|
|
|
|
if(argc < 2) {
|
|
umount_cifs_usage();
|
|
return -EINVAL;
|
|
}
|
|
|
|
if(thisprogram == NULL)
|
|
thisprogram = "umount.cifs";
|
|
|
|
/* add sharename in opts string as unc= parm */
|
|
|
|
while ((c = getopt_long (argc, argv, "afhilnrvV",
|
|
longopts, NULL)) != -1) {
|
|
switch (c) {
|
|
/* No code to do the following option yet */
|
|
/* case 'a':
|
|
++umount_all;
|
|
break; */
|
|
case '?':
|
|
case 'h': /* help */
|
|
umount_cifs_usage();
|
|
exit(1);
|
|
case 'n':
|
|
++nomtab;
|
|
break;
|
|
case 'f':
|
|
flags |= MNT_FORCE;
|
|
break;
|
|
case 'l':
|
|
flags |= MNT_DETACH; /* lazy unmount */
|
|
break;
|
|
case 'e':
|
|
flags |= MNT_EXPIRE; /* gradually timeout */
|
|
break;
|
|
case 'r':
|
|
++retry_remount;
|
|
break;
|
|
case 'v':
|
|
++verboseflg;
|
|
break;
|
|
case 'V':
|
|
printf ("umount.cifs version: %s.%s%s\n",
|
|
UNMOUNT_CIFS_VERSION_MAJOR,
|
|
UNMOUNT_CIFS_VERSION_MINOR,
|
|
UNMOUNT_CIFS_VENDOR_SUFFIX);
|
|
exit (0);
|
|
default:
|
|
printf("unknown unmount option %c\n",c);
|
|
umount_cifs_usage();
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/* move past the umount options */
|
|
argv += optind;
|
|
argc -= optind;
|
|
|
|
mountpoint = argv[0];
|
|
|
|
if((argc < 1) || (argv[0] == NULL)) {
|
|
printf("\nMissing name of unmount directory\n");
|
|
umount_cifs_usage();
|
|
return -EINVAL;
|
|
}
|
|
|
|
if(verboseflg)
|
|
printf("optind %d unmount dir %s\n",optind, mountpoint);
|
|
|
|
/* check if running effectively root */
|
|
if(geteuid() != 0) {
|
|
printf("Trying to unmount when %s not installed suid\n",thisprogram);
|
|
if(verboseflg)
|
|
printf("euid = %d\n",geteuid());
|
|
return -EACCES;
|
|
}
|
|
|
|
/* fixup path if needed */
|
|
|
|
/* make sure that this is a cifs filesystem */
|
|
rc = statfs(mountpoint, &statbuf);
|
|
|
|
if(rc || (statbuf.f_type != CIFS_MAGIC_NUMBER)) {
|
|
printf("This utility only unmounts cifs filesystems.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* check if our uid was the one who mounted */
|
|
rc = umount_check_perm(mountpoint);
|
|
if (rc) {
|
|
printf("Not permitted to unmount\n");
|
|
return rc;
|
|
}
|
|
|
|
if(umount2(mountpoint, flags)) {
|
|
/* remember to kill daemon on error */
|
|
switch (errno) {
|
|
case 0:
|
|
printf("unmount failed but no error number set\n");
|
|
break;
|
|
default:
|
|
printf("unmount error %d = %s\n",errno,strerror(errno));
|
|
}
|
|
printf("Refer to the umount.cifs(8) manual page (man 8 umount.cifs)\n");
|
|
return -1;
|
|
} else {
|
|
if(verboseflg)
|
|
printf("umount2 succeeded\n");
|
|
if(nomtab == 0)
|
|
remove_from_mtab(mountpoint);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|