+++ /dev/null
-/*
- 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>
-#include <limits.h>
-#include "mount.h"
-
-#define UNMOUNT_CIFS_VERSION_MAJOR "0"
-#define UNMOUNT_CIFS_VERSION_MINOR "6"
-
-#ifndef UNMOUNT_CIFS_VENDOR_SUFFIX
- #ifdef _SAMBA_BUILD_
- #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 remove_from_mtab(char * mountpoint)
-{
- int rc;
- int num_matches;
- FILE * org_fd;
- FILE * new_fd;
- struct mntent * mount_entry;
- struct stat statbuf;
-
- /* If it is a symlink, e.g. to /proc/mounts, no need to update it. */
- if ((lstat(MOUNTED, &statbuf) == 0) && (S_ISLNK(statbuf.st_mode)))
- return 0;
-
- /* Do we first need to check if it is writable? */
-
- atexit(unlock_mtab);
- 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;
-}
-
-/* Make a canonical pathname from PATH. Returns a freshly malloced string.
- It is up the *caller* to ensure that the PATH is sensible. i.e.
- canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.''
- is not a legal pathname for ``/dev/fd0'' Anything we cannot parse
- we return unmodified. */
-static char *
-canonicalize(char *path)
-{
- char *canonical;
-
- if (path == NULL) {
- return NULL;
- }
-
- if (strlen(path) > PATH_MAX) {
- fprintf(stderr, "Mount point string too long\n");
- return NULL;
- }
-
- canonical = (char *)malloc (PATH_MAX + 1);
-
- if (!canonical) {
- fprintf(stderr, "Error! Not enough memory!\n");
- return NULL;
- }
-
- if (realpath (path, canonical))
- return canonical;
-
- strncpy (canonical, path, PATH_MAX);
- canonical[PATH_MAX] = '\0';
- return canonical;
-}
-
-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 = canonicalize(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 */
-
- /* Trim any trailing slashes */
- while ((strlen(mountpoint) > 1) &&
- (mountpoint[strlen(mountpoint)-1] == '/'))
- {
- mountpoint[strlen(mountpoint)-1] = '\0';
- }
-
- /* 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;
-}
-
git.samba.org / sfrench / samba-autobuild / .git / blobdiff