d4f2c120c0
Found by: clang static analyzer Reviewed by: ed Differential Revision: https://reviews.freebsd.org/D4722
616 lines
15 KiB
C
616 lines
15 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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* 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 const 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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#if 0
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static char sccsid[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netdb.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/mount.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.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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#include "mounttab.h"
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typedef enum { FIND, REMOVE, CHECKUNIQUE } dowhat;
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static struct addrinfo *nfshost_ai = NULL;
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static int fflag, vflag;
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static char *nfshost;
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struct statfs *checkmntlist(char *);
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int checkvfsname (const char *, char **);
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struct statfs *getmntentry(const char *fromname, const char *onname,
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fsid_t *fsid, dowhat what);
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char **makevfslist (const char *);
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size_t mntinfo (struct statfs **);
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int namematch (struct addrinfo *);
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int parsehexfsid(const char *hex, fsid_t *fsid);
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int sacmp (void *, void *);
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int umountall (char **);
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int checkname (char *, char **);
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int umountfs(struct statfs *sfs);
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void usage (void);
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int xdr_dir (XDR *, char *);
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int
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main(int argc, char *argv[])
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{
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int all, errs, ch, mntsize, error;
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char **typelist = NULL;
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struct statfs *mntbuf, *sfs;
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struct addrinfo hints;
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all = errs = 0;
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while ((ch = getopt(argc, argv, "AaF:fh: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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setfstab(optarg);
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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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err(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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/* Start disks transferring immediately. */
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if ((fflag & MNT_FORCE) == 0)
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sync();
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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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if (nfshost != NULL) {
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memset(&hints, 0, sizeof hints);
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error = getaddrinfo(nfshost, NULL, &hints, &nfshost_ai);
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if (error)
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errx(1, "%s: %s", nfshost, gai_strerror(error));
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}
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switch (all) {
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case 2:
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if ((mntsize = mntinfo(&mntbuf)) <= 0)
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break;
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/*
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* We unmount the nfs-mounts in the reverse order
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* that they were mounted.
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*/
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for (errs = 0, mntsize--; mntsize > 0; mntsize--) {
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sfs = &mntbuf[mntsize];
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if (checkvfsname(sfs->f_fstypename, typelist))
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continue;
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if (strcmp(sfs->f_mntonname, "/dev") == 0)
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continue;
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if (umountfs(sfs) != 0)
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errs = 1;
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}
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free(mntbuf);
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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", getfstab());
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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 (checkname(*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(char **typelist)
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{
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struct xvfsconf vfc;
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struct fstab *fs;
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int rval;
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char *cp;
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static int firstcall = 1;
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if ((fs = getfsent()) != NULL)
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firstcall = 0;
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else if (firstcall)
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errx(1, "fstab reading failure");
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else
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return (0);
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do {
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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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/* Ignore unknown file system types. */
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if (getvfsbyname(fs->fs_vfstype, &vfc) == -1)
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continue;
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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, "malloc failed");
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(void)strcpy(cp, fs->fs_file);
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rval = umountall(typelist);
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rval = checkname(cp, typelist) || rval;
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free(cp);
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return (rval);
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} while ((fs = getfsent()) != NULL);
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return (0);
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}
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/*
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* Do magic checks on mountpoint/device/fsid, and then call unmount(2).
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*/
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int
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checkname(char *mntname, char **typelist)
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{
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char buf[MAXPATHLEN];
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struct statfs sfsbuf;
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struct stat sb;
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struct statfs *sfs;
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char *delimp;
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dev_t dev;
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int len;
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/*
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* 1. Check if the name exists in the mounttable.
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*/
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sfs = checkmntlist(mntname);
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/*
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* 2. Remove trailing slashes if there are any. After that
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* we look up the name in the mounttable again.
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*/
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if (sfs == NULL) {
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len = strlen(mntname);
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while (len > 1 && mntname[len - 1] == '/')
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mntname[--len] = '\0';
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sfs = checkmntlist(mntname);
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}
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/*
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* 3. Check if the deprecated NFS syntax with an '@' has been used
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* and translate it to the ':' syntax. Look up the name in the
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* mount table again.
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*/
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if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
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snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
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(int)(delimp - mntname), mntname);
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len = strlen(buf);
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while (len > 1 && buf[len - 1] == '/')
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buf[--len] = '\0';
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sfs = checkmntlist(buf);
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}
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/*
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* 4. Resort to a statfs(2) call. This is the last check so that
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* hung NFS filesystems for example can be unmounted without
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* potentially blocking forever in statfs() as long as the
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* filesystem is specified unambiguously. This covers all the
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* hard cases such as symlinks and mismatches between the
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* mount list and reality.
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* We also do this if an ambiguous mount point was specified.
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*/
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if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
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getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
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if (statfs(mntname, &sfsbuf) != 0) {
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warn("%s: statfs", mntname);
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} else if (stat(mntname, &sb) != 0) {
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warn("%s: stat", mntname);
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} else if (S_ISDIR(sb.st_mode)) {
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/* Check that `mntname' is the root directory. */
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dev = sb.st_dev;
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snprintf(buf, sizeof(buf), "%s/..", mntname);
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if (stat(buf, &sb) != 0) {
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warn("%s: stat", buf);
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} else if (sb.st_dev == dev) {
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warnx("%s: not a file system root directory",
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mntname);
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return (1);
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} else
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sfs = &sfsbuf;
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}
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}
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if (sfs == NULL) {
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warnx("%s: unknown file system", mntname);
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return (1);
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}
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if (checkvfsname(sfs->f_fstypename, typelist))
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return (1);
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return (umountfs(sfs));
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}
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/*
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* NFS stuff and unmount(2) call
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*/
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int
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umountfs(struct statfs *sfs)
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{
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char fsidbuf[64];
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enum clnt_stat clnt_stat;
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struct timeval try;
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struct addrinfo *ai, hints;
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int do_rpc;
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CLIENT *clp;
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char *nfsdirname, *orignfsdirname;
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char *hostp, *delimp;
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ai = NULL;
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do_rpc = 0;
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hostp = NULL;
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nfsdirname = delimp = orignfsdirname = NULL;
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memset(&hints, 0, sizeof hints);
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if (strcmp(sfs->f_fstypename, "nfs") == 0) {
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if ((nfsdirname = strdup(sfs->f_mntfromname)) == NULL)
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err(1, "strdup");
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orignfsdirname = nfsdirname;
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if (*nfsdirname == '[' &&
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(delimp = strchr(nfsdirname + 1, ']')) != NULL &&
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*(delimp + 1) == ':') {
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hostp = nfsdirname + 1;
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nfsdirname = delimp + 2;
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} else if ((delimp = strrchr(nfsdirname, ':')) != NULL) {
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hostp = nfsdirname;
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nfsdirname = delimp + 1;
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}
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if (hostp != NULL) {
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*delimp = '\0';
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getaddrinfo(hostp, NULL, &hints, &ai);
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if (ai == NULL) {
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warnx("can't get net id for host");
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}
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}
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/*
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* Check if we have to start the rpc-call later.
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* If there are still identical nfs-names mounted,
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* we skip the rpc-call. Obviously this has to
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* happen before unmount(2), but it should happen
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* after the previous namecheck.
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* A non-NULL return means that this is the last
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* mount from mntfromname that is still mounted.
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*/
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if (getmntentry(sfs->f_mntfromname, NULL, NULL,
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CHECKUNIQUE) != NULL)
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do_rpc = 1;
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}
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if (!namematch(ai)) {
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free(orignfsdirname);
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return (1);
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}
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/* First try to unmount using the file system ID. */
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snprintf(fsidbuf, sizeof(fsidbuf), "FSID:%d:%d", sfs->f_fsid.val[0],
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sfs->f_fsid.val[1]);
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if (unmount(fsidbuf, fflag | MNT_BYFSID) != 0) {
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/* XXX, non-root users get a zero fsid, so don't warn. */
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if (errno != ENOENT || sfs->f_fsid.val[0] != 0 ||
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sfs->f_fsid.val[1] != 0)
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warn("unmount of %s failed", sfs->f_mntonname);
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if (errno != ENOENT) {
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free(orignfsdirname);
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return (1);
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}
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/* Compatibility for old kernels. */
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if (sfs->f_fsid.val[0] != 0 || sfs->f_fsid.val[1] != 0)
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warnx("retrying using path instead of file system ID");
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if (unmount(sfs->f_mntonname, fflag) != 0) {
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warn("unmount of %s failed", sfs->f_mntonname);
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free(orignfsdirname);
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return (1);
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}
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}
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/* Mark this this file system as unmounted. */
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getmntentry(NULL, NULL, &sfs->f_fsid, REMOVE);
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if (vflag)
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(void)printf("%s: unmount from %s\n", sfs->f_mntfromname,
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sfs->f_mntonname);
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/*
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* Report to mountd-server which nfsname
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* has been unmounted.
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*/
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if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
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clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS3, "udp");
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if (clp == NULL) {
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warnx("%s: %s", hostp,
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clnt_spcreateerror("MOUNTPROG"));
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free(orignfsdirname);
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return (1);
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}
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clp->cl_auth = authsys_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, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir,
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nfsdirname, (xdrproc_t)xdr_void, (caddr_t)0, try);
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if (clnt_stat != RPC_SUCCESS) {
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warnx("%s: %s", hostp,
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clnt_sperror(clp, "RPCMNT_UMOUNT"));
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free(orignfsdirname);
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return (1);
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}
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/*
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* Remove the unmounted entry from /var/db/mounttab.
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*/
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if (read_mtab()) {
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clean_mtab(hostp, nfsdirname, vflag);
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if(!write_mtab(vflag))
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warnx("cannot remove mounttab entry %s:%s",
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hostp, nfsdirname);
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free_mtab();
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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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free(orignfsdirname);
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return (0);
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}
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struct statfs *
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getmntentry(const char *fromname, const char *onname, fsid_t *fsid, dowhat what)
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{
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static struct statfs *mntbuf;
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static size_t mntsize = 0;
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static int *mntcheck = NULL;
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struct statfs *sfs, *foundsfs;
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int i, count;
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if (mntsize <= 0) {
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if ((mntsize = mntinfo(&mntbuf)) <= 0)
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return (NULL);
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}
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if (mntcheck == NULL) {
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if ((mntcheck = calloc(mntsize + 1, sizeof(int))) == NULL)
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err(1, "calloc");
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}
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/*
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* We want to get the file systems in the reverse order
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* that they were mounted. Unmounted file systems are marked
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* in a table called 'mntcheck'.
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*/
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count = 0;
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foundsfs = NULL;
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for (i = mntsize - 1; i >= 0; i--) {
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if (mntcheck[i])
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continue;
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sfs = &mntbuf[i];
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if (fromname != NULL && strcmp(sfs->f_mntfromname,
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fromname) != 0)
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continue;
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if (onname != NULL && strcmp(sfs->f_mntonname, onname) != 0)
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continue;
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if (fsid != NULL && bcmp(&sfs->f_fsid, fsid,
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sizeof(*fsid)) != 0)
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continue;
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switch (what) {
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case CHECKUNIQUE:
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foundsfs = sfs;
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count++;
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continue;
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case REMOVE:
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mntcheck[i] = 1;
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break;
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default:
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break;
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}
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return (sfs);
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}
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if (what == CHECKUNIQUE && count == 1)
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return (foundsfs);
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return (NULL);
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}
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int
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sacmp(void *sa1, void *sa2)
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{
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void *p1, *p2;
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int len;
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if (((struct sockaddr *)sa1)->sa_family !=
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((struct sockaddr *)sa2)->sa_family)
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return (1);
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switch (((struct sockaddr *)sa1)->sa_family) {
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case AF_INET:
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p1 = &((struct sockaddr_in *)sa1)->sin_addr;
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p2 = &((struct sockaddr_in *)sa2)->sin_addr;
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len = 4;
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break;
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case AF_INET6:
|
|
p1 = &((struct sockaddr_in6 *)sa1)->sin6_addr;
|
|
p2 = &((struct sockaddr_in6 *)sa2)->sin6_addr;
|
|
len = 16;
|
|
if (((struct sockaddr_in6 *)sa1)->sin6_scope_id !=
|
|
((struct sockaddr_in6 *)sa2)->sin6_scope_id)
|
|
return (1);
|
|
break;
|
|
default:
|
|
return (1);
|
|
}
|
|
|
|
return memcmp(p1, p2, len);
|
|
}
|
|
|
|
int
|
|
namematch(struct addrinfo *ai)
|
|
{
|
|
struct addrinfo *aip;
|
|
|
|
if (nfshost == NULL || nfshost_ai == NULL)
|
|
return (1);
|
|
|
|
while (ai != NULL) {
|
|
aip = nfshost_ai;
|
|
while (aip != NULL) {
|
|
if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
|
|
return (1);
|
|
aip = aip->ai_next;
|
|
}
|
|
ai = ai->ai_next;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
struct statfs *
|
|
checkmntlist(char *mntname)
|
|
{
|
|
struct statfs *sfs;
|
|
fsid_t fsid;
|
|
|
|
sfs = NULL;
|
|
if (parsehexfsid(mntname, &fsid) == 0)
|
|
sfs = getmntentry(NULL, NULL, &fsid, FIND);
|
|
if (sfs == NULL)
|
|
sfs = getmntentry(NULL, mntname, NULL, FIND);
|
|
if (sfs == NULL)
|
|
sfs = getmntentry(mntname, NULL, NULL, FIND);
|
|
return (sfs);
|
|
}
|
|
|
|
size_t
|
|
mntinfo(struct statfs **mntbuf)
|
|
{
|
|
static struct statfs *origbuf;
|
|
size_t bufsize;
|
|
int mntsize;
|
|
|
|
mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
|
|
if (mntsize <= 0)
|
|
return (0);
|
|
bufsize = (mntsize + 1) * sizeof(struct statfs);
|
|
if ((origbuf = malloc(bufsize)) == NULL)
|
|
err(1, "malloc");
|
|
mntsize = getfsstat(origbuf, (long)bufsize, MNT_NOWAIT);
|
|
*mntbuf = origbuf;
|
|
return (mntsize);
|
|
}
|
|
|
|
/*
|
|
* Convert a hexadecimal filesystem ID to an fsid_t.
|
|
* Returns 0 on success.
|
|
*/
|
|
int
|
|
parsehexfsid(const char *hex, fsid_t *fsid)
|
|
{
|
|
char hexbuf[3];
|
|
int i;
|
|
|
|
if (strlen(hex) != sizeof(*fsid) * 2)
|
|
return (-1);
|
|
hexbuf[2] = '\0';
|
|
for (i = 0; i < (int)sizeof(*fsid); i++) {
|
|
hexbuf[0] = hex[i * 2];
|
|
hexbuf[1] = hex[i * 2 + 1];
|
|
if (!isxdigit(hexbuf[0]) || !isxdigit(hexbuf[1]))
|
|
return (-1);
|
|
((u_char *)fsid)[i] = strtol(hexbuf, NULL, 16);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* xdr routines for mount rpc's
|
|
*/
|
|
int
|
|
xdr_dir(XDR *xdrsp, char *dirp)
|
|
{
|
|
|
|
return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
|
|
}
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
|
|
(void)fprintf(stderr, "%s\n%s\n",
|
|
"usage: umount [-fv] special ... | node ... | fsid ...",
|
|
" umount -a | -A [-F fstab] [-fv] [-h host] [-t type]");
|
|
exit(1);
|
|
}
|