428fb2dd11
umount() was trying to stat() the mountpoint, this would fail if the mountpoint was a NFS mountpoint, and the fallback code would try and pass a hostname:/dir path as the mountpoint to unmount(2), which would fail. This whole stat() of the name supplied on the command line business is trouble as it'll wedge on a hung NFS mount. I'm not entirely sure why we are not simply looking up both arguments in the mount table and doing the right thing without accessing the filesystem. It seems that we're going to a lot of trouble to allow mountpoints on symlinks and other wierd things. PR: 1607
387 lines
9.1 KiB
C
387 lines
9.1 KiB
C
/*-
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* Copyright (c) 1980, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1980, 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <netdb.h>
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#include <rpc/rpc.h>
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#include <rpc/pmap_clnt.h>
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#include <rpc/pmap_prot.h>
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#include <nfs/rpcv2.h>
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#include <err.h>
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#include <fstab.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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typedef enum { MNTON, MNTFROM } mntwhat;
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int fake, fflag, vflag;
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char *nfshost;
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int checkvfsname __P((const char *, char **));
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char *getmntname __P((char *, mntwhat, char **));
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char **makevfslist __P((char *));
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int selected __P((int));
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int namematch __P((struct hostent *));
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int umountall __P((char **));
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int umountfs __P((char *, char **));
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void usage __P((void));
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int xdr_dir __P((XDR *, char *));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int all, ch, errs, mnts;
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char **typelist = NULL;
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struct statfs *mntbuf;
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/* Start disks transferring immediately. */
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sync();
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all = 0;
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while ((ch = getopt(argc, argv, "AaFfh:t:v")) != -1)
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switch (ch) {
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case 'A':
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all = 2;
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break;
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case 'a':
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all = 1;
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break;
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case 'F':
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fake = 1;
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break;
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case 'f':
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fflag = MNT_FORCE;
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break;
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case 'h': /* -h implies -A. */
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all = 2;
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nfshost = optarg;
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break;
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case 't':
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if (typelist != NULL)
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errx(1, "only one -t option may be specified.");
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typelist = makevfslist(optarg);
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break;
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case 'v':
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vflag = 1;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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argc -= optind;
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argv += optind;
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if (argc == 0 && !all || argc != 0 && all)
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usage();
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/* -h implies "-t nfs" if no -t flag. */
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if ((nfshost != NULL) && (typelist == NULL))
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typelist = makevfslist("nfs");
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switch (all) {
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case 2:
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if ((mnts = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
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warn("getmntinfo");
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errs = 1;
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break;
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}
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for (errs = 0, mnts--; mnts > 0; mnts--) {
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if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
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continue;
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if (umountfs(mntbuf[mnts].f_mntonname, typelist) != 0)
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errs = 1;
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}
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break;
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case 1:
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if (setfsent() == 0)
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err(1, "%s", _PATH_FSTAB);
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errs = umountall(typelist);
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break;
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case 0:
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for (errs = 0; *argv != NULL; ++argv)
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if (umountfs(*argv, typelist) != 0)
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errs = 1;
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break;
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}
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exit(errs);
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}
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int
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umountall(typelist)
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char **typelist;
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{
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struct fstab *fs;
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int rval, type;
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char *cp;
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struct vfsconf vfc;
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while ((fs = getfsent()) != NULL) {
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/* Ignore the root. */
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if (strcmp(fs->fs_file, "/") == 0)
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continue;
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/*
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* !!!
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* Historic practice: ignore unknown FSTAB_* fields.
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*/
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if (strcmp(fs->fs_type, FSTAB_RW) &&
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strcmp(fs->fs_type, FSTAB_RO) &&
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strcmp(fs->fs_type, FSTAB_RQ))
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continue;
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/* If an unknown file system type, complain. */
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if (getvfsbyname(fs->fs_vfstype, &vfc) < 0) {
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warnx("%s: unknown mount type", fs->fs_vfstype);
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continue;
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}
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if (checkvfsname(fs->fs_vfstype, typelist))
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continue;
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/*
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* We want to unmount the file systems in the reverse order
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* that they were mounted. So, we save off the file name
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* in some allocated memory, and then call recursively.
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*/
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if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
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err(1, NULL);
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(void)strcpy(cp, fs->fs_file);
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rval = umountall(typelist);
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return (umountfs(cp, typelist) || rval);
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}
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return (0);
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}
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int
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umountfs(name, typelist)
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char *name;
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char **typelist;
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{
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enum clnt_stat clnt_stat;
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struct hostent *hp;
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struct sockaddr_in saddr;
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struct stat sb;
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struct timeval pertry, try;
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CLIENT *clp;
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int so;
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char *type, *delimp, *hostp, *mntpt, *origname, rname[MAXPATHLEN];
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if (realpath(name, rname) == NULL) {
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/* Continue and let the system call check it... */
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strcpy(rname, name);
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}
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origname = name;
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if (stat(name, &sb) < 0) {
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mntpt = rname;
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if ((getmntname(rname, MNTFROM, &type) == NULL) &&
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((mntpt = getmntname(name, MNTON, &type)) == NULL)) {
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warnx("%s: not currently mounted", name);
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return (1);
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}
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} else if (S_ISBLK(sb.st_mode)) {
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if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
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warnx("%s: not currently mounted", name);
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return (1);
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}
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} else if (S_ISDIR(sb.st_mode)) {
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mntpt = rname;
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if (getmntname(mntpt, MNTFROM, &type) == NULL) {
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warnx("%s: not currently mounted", name);
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return (1);
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}
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} else {
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warnx("%s: not a directory or special device", name);
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return (1);
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}
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name = rname;
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if (checkvfsname(type, typelist))
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return (1);
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hp = NULL;
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if (!strcmp(type, "nfs")) {
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if ((delimp = strchr(name, '@')) != NULL) {
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hostp = delimp + 1;
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*delimp = '\0';
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hp = gethostbyname(hostp);
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*delimp = '@';
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} else if ((delimp = strchr(name, ':')) != NULL) {
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*delimp = '\0';
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hostp = name;
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hp = gethostbyname(hostp);
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name = delimp + 1;
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*delimp = ':';
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}
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}
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if (!namematch(hp))
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return (1);
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if (vflag)
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(void)printf("%s: unmount from %s\n", origname, mntpt);
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if (fake)
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return (0);
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if (unmount(mntpt, fflag) < 0) {
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warn("%s", mntpt);
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return (1);
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}
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if ((hp != NULL) && !(fflag & MNT_FORCE)) {
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*delimp = '\0';
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memset(&saddr, 0, sizeof(saddr));
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saddr.sin_family = AF_INET;
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saddr.sin_port = 0;
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memmove(&saddr.sin_addr, hp->h_addr,
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MIN(hp->h_length, sizeof(saddr.sin_addr)));
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pertry.tv_sec = 3;
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pertry.tv_usec = 0;
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so = RPC_ANYSOCK;
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if ((clp = clntudp_create(&saddr,
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RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
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clnt_pcreateerror("Cannot MNT PRC");
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return (1);
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}
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clp->cl_auth = authunix_create_default();
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try.tv_sec = 20;
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try.tv_usec = 0;
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clnt_stat = clnt_call(clp,
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RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try);
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if (clnt_stat != RPC_SUCCESS) {
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clnt_perror(clp, "Bad MNT RPC");
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return (1);
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}
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auth_destroy(clp->cl_auth);
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clnt_destroy(clp);
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}
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return (0);
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}
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char *
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getmntname(name, what, type)
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char *name;
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mntwhat what;
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char **type;
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{
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static struct statfs *mntbuf;
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static int mntsize;
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int i;
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if (mntbuf == NULL &&
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(mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
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warn("getmntinfo");
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return (NULL);
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}
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for (i = 0; i < mntsize; i++) {
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if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
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if (type)
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*type = mntbuf[i].f_fstypename;
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return (mntbuf[i].f_mntonname);
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}
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if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
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if (type)
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*type = mntbuf[i].f_fstypename;
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return (mntbuf[i].f_mntfromname);
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}
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}
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return (NULL);
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}
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int
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namematch(hp)
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struct hostent *hp;
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{
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char *cp, **np;
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if ((hp == NULL) || (nfshost == NULL))
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return (1);
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if (strcasecmp(nfshost, hp->h_name) == 0)
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return (1);
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if ((cp = strchr(hp->h_name, '.')) != NULL) {
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*cp = '\0';
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if (strcasecmp(nfshost, hp->h_name) == 0)
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return (1);
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}
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for (np = hp->h_aliases; *np; np++) {
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if (strcasecmp(nfshost, *np) == 0)
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return (1);
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if ((cp = strchr(*np, '.')) != NULL) {
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*cp = '\0';
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if (strcasecmp(nfshost, *np) == 0)
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return (1);
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}
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}
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return (0);
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}
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/*
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* xdr routines for mount rpc's
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*/
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int
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xdr_dir(xdrsp, dirp)
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XDR *xdrsp;
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char *dirp;
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{
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return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
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}
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void
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usage()
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{
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(void)fprintf(stderr, "%s\n%s\n",
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"usage: umount [-fv] special | node",
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" umount -a | -A [-fv] [-h host] [-t type]");
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exit(1);
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}
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