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r6255: Initial checkin of cifs umount utility
(This used to be commit 8f7c36a6c442ce5030be546b761f807fd2fa8087)
This commit is contained in:
Steve French
Gerald (Jerry) Carter
parent
8abd17fe1c
commit
f168ebafb3
266
source3/client/umount.cifs.c
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266
source3/client/umount.cifs.c
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/*
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Unmount utility program for Linux CIFS VFS (virtual filesystem) client
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Copyright (C) 2005 Steve French (sfrench@us.ibm.com)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <errno.h>
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#include <string.h>
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#include <mntent.h>
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#define UNMOUNT_CIFS_VERSION_MAJOR "0"
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#define UNMOUNT_CIFS_VERSION_MINOR "1"
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#ifndef UNMOUNT_CIFS_VENDOR_SUFFIX
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#define UNMOUNT_CIFS_VENDOR_SUFFIX ""
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#endif
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#ifndef MNT_DETACH
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#define MNT_DETACH 0x02
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#endif
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#ifndef MNT_EXPIRE
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#define MNT_EXPIRE 0x04
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#endif
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#define CIFS_IOC_CHECKUMOUNT _IOR('u', 2, int)
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static struct option longopts[] = {
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{ "all", 0, NULL, 'a' },
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{ "help",0, NULL, 'h' },
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{ "read-only", 0, NULL, 'r' },
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{ "ro", 0, NULL, 'r' },
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{ "verbose", 0, NULL, 'v' },
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{ "version", 0, NULL, 'V' },
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{ "expire", 0, NULL, 'e' },
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{ "force", 0, 0, 'f' },
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{ "lazy", 0, 0, 'l' },
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{ "no-mtab", 0, 0, 'n' },
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{ NULL, 0, NULL, 0 }
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};
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char * thisprogram;
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int verboseflg = 0;
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static void umount_cifs_usage(void)
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{
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printf("\nUsage: %s <remotetarget> <dir>\n", thisprogram);
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printf("\nUnmount the specified directory\n");
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printf("\nLess commonly used options:");
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printf("\n\t-r\tIf mount fails, retry with readonly remount.");
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printf("\n\t-n\tDo not write to mtab.");
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printf("\n\t-f\tAttempt a forced unmount, even if the fs is busy.");
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printf("\n\t-l\tAttempt lazy unmount, Unmount now, cleanup later.");
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printf("\n\t-v\tEnable verbose mode (may be useful for debugging).");
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printf("\n\t-h\tDisplay this help.");
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printf("\n\nOptions are described in more detail in the manual page");
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printf("\n\tman 8 umount.cifs\n");
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printf("\nTo display the version number of the cifs umount utility:");
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printf("\n\t%s -V\n",thisprogram);
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}
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static int umount_check_perm(char * dir)
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{
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int fileid;
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int rc;
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/* presumably can not chdir into the target as we do on mount */
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fileid = open(dir, O_RDONLY | O_DIRECTORY | O_NOFOLLOW, 0);
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/* check if fileid valid if fileid == -1 BB FIXME */
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rc = ioctl(fileid, CIFS_IOC_CHECKUMOUNT, NULL);
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if(verboseflg)
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printf("ioctl returned %d with errno %d\n",rc,errno);
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close(fileid);
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return rc;
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}
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int main(int argc, char ** argv)
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{
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int c;
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int rc;
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int flags = 0;
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int nomtab = 0;
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int retry_remount = 0;
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struct mntent mountent;
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char * mountpoint;
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FILE * pmntfile;
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if(argc && argv) {
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thisprogram = argv[0];
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} else {
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umount_cifs_usage();
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return -EINVAL;
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}
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if(argc < 2) {
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umount_cifs_usage();
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return -EINVAL;
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}
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if(thisprogram == NULL)
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thisprogram = "umount.cifs";
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/* add sharename in opts string as unc= parm */
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while ((c = getopt_long (argc, argv, "afhilnrvV",
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longopts, NULL)) != -1) {
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switch (c) {
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/* No code to do the following option yet */
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/* case 'a':
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++umount_all;
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break; */
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case '?':
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case 'h': /* help */
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umount_cifs_usage();
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exit(1);
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case 'n':
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++nomtab;
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break;
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case 'f':
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flags |= MNT_FORCE;
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break;
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case 'l':
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flags |= MNT_DETACH; /* lazy unmount */
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break;
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case 'e':
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flags |= MNT_EXPIRE; /* gradually timeout */
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break;
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case 'r':
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++retry_remount;
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break;
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case 'v':
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++verboseflg;
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break;
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case 'V':
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printf ("umount.cifs version: %s.%s%s\n",
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UNMOUNT_CIFS_VERSION_MAJOR,
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UNMOUNT_CIFS_VERSION_MINOR,
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UNMOUNT_CIFS_VENDOR_SUFFIX);
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exit (0);
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default:
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printf("unknown unmount option %c\n",c);
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umount_cifs_usage();
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exit(1);
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}
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}
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/* move past the umount options */
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argv += optind;
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argc -= optind;
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mountpoint = argv[0];
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if((argc < 1) || (argv[0] == NULL)) {
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printf("\nMissing name of unmount directory\n");
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umount_cifs_usage();
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return -EINVAL;
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}
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if(verboseflg)
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printf("optind %d unmount dir %s\n",optind, mountpoint);
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/* check if running effectively root */
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if(geteuid() != 0)
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printf("Trying to unmount when %s not installed suid\n",thisprogram);
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/* fixup path if needed */
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/* check if our uid was the one who mounted */
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rc = umount_check_perm(mountpoint);
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if (rc) {
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return rc;
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}
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if(umount2(mountpoint, flags)) {
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/* remember to kill daemon on error */
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switch (errno) {
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case 0:
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printf("mount failed but no error number set\n");
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break;
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default:
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printf("mount error %d = %s\n",errno,strerror(errno));
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}
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printf("Refer to the umount.cifs(8) manual page (e.g.man 8 umount.cifs)\n");
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return -1;
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} else {
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pmntfile = setmntent(MOUNTED, "a+");
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if(pmntfile) {
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/* mountent.mnt_fsname = share_name;
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mountent.mnt_dir = mountpoint;
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mountent.mnt_type = "cifs";
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mountent.mnt_opts = malloc(220);
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if(mountent.mnt_opts) {
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char * mount_user = getusername();
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memset(mountent.mnt_opts,0,200);
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if(flags & MS_RDONLY)
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strcat(mountent.mnt_opts,"ro");
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else
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strcat(mountent.mnt_opts,"rw");
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if(flags & MS_MANDLOCK)
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strcat(mountent.mnt_opts,",mand");
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else
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strcat(mountent.mnt_opts,",nomand");
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if(flags & MS_NOEXEC)
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strcat(mountent.mnt_opts,",noexec");
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if(flags & MS_NOSUID)
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strcat(mountent.mnt_opts,",nosuid");
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if(flags & MS_NODEV)
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strcat(mountent.mnt_opts,",nodev");
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if(flags & MS_SYNCHRONOUS)
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strcat(mountent.mnt_opts,",synch");
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if(mount_user) {
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if(getuid() != 0) {
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strcat(mountent.mnt_opts,",user=");
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strcat(mountent.mnt_opts,mount_user);
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}
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free(mount_user);
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}
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}
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mountent.mnt_freq = 0;
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mountent.mnt_passno = 0;
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rc = addmntent(pmntfile,&mountent);
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endmntent(pmntfile);
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if(mountent.mnt_opts)
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free(mountent.mnt_opts);*/
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} else {
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printf("could not update mount table\n");
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}
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}
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return 0;
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}
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