751 lines
17 KiB
C
751 lines
17 KiB
C
/* $NetBSD: mount.c,v 1.78 2005/06/27 01:00:05 christos Exp $ */
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/*
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* Copyright (c) 1980, 1989, 1993, 1994
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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. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1989, 1993, 1994\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[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95";
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#else
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__RCSID("$NetBSD: mount.c,v 1.78 2005/06/27 01:00:05 christos Exp $");
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#endif
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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/wait.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 <pwd.h>
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#include <signal.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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#define MOUNTNAMES
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#include <fcntl.h>
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#include <sys/disk.h>
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#include <sys/disklabel.h>
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#include <sys/ioctl.h>
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#include "pathnames.h"
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#include "vfslist.h"
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static int debug, verbose;
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static void catopt(char **, const char *);
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static const char *
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getfslab(const char *str);
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static struct statvfs *
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getmntpt(const char *);
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static int getmntargs(struct statvfs *, char *, size_t);
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static int hasopt(const char *, const char *);
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static void mangle(char *, int *, const char ***, int *);
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static int mountfs(const char *, const char *, const char *,
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int, const char *, const char *, int, char *, size_t);
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static void prmount(struct statvfs *);
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static void usage(void);
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/* Map from mount otions to printable formats. */
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static const struct opt {
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int o_opt;
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int o_silent;
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const char *o_name;
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} optnames[] = {
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__MNT_FLAGS
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};
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static char ffs_fstype[] = "ffs";
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int
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main(int argc, char *argv[])
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{
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const char *mntfromname, *mntonname, **vfslist, *vfstype;
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struct fstab *fs;
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struct statvfs *mntbuf;
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FILE *mountdfp;
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int all, ch, forceall, i, init_flags, mntsize, rval;
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char *options;
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const char *mountopts, *fstypename;
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char canonical_path_buf[MAXPATHLEN];
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char *canonical_path;
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/* started as "mount" */
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all = forceall = init_flags = 0;
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options = NULL;
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vfslist = NULL;
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vfstype = ffs_fstype;
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while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1)
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switch (ch) {
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case 'A':
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all = forceall = 1;
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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 'd':
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debug = 1;
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break;
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case 'f':
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init_flags |= MNT_FORCE;
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break;
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case 'o':
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if (*optarg)
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catopt(&options, optarg);
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break;
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case 'r':
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init_flags |= MNT_RDONLY;
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break;
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case 't':
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if (vfslist != NULL)
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errx(1,
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"only one -t option may be specified.");
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vfslist = makevfslist(optarg);
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vfstype = optarg;
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break;
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case 'u':
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init_flags |= MNT_UPDATE;
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break;
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case 'v':
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verbose++;
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break;
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case 'w':
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init_flags &= ~MNT_RDONLY;
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break;
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case '?':
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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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#define BADTYPE(type) \
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(strcmp(type, FSTAB_RO) && \
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strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
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rval = 0;
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switch (argc) {
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case 0:
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if (all)
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while ((fs = getfsent()) != NULL) {
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if (BADTYPE(fs->fs_type))
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continue;
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if (checkvfsname(fs->fs_vfstype, vfslist))
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continue;
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if (hasopt(fs->fs_mntops, "noauto"))
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continue;
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if (strcmp(fs->fs_spec, "from_mount") == 0) {
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if ((mntbuf = getmntpt(fs->fs_file)) == NULL)
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errx(1,
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"unknown file system %s.",
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fs->fs_file);
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mntfromname = mntbuf->f_mntfromname;
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} else
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mntfromname = fs->fs_spec;
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if (mountfs(fs->fs_vfstype, mntfromname,
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fs->fs_file, init_flags, options,
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fs->fs_mntops, !forceall, NULL, 0))
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rval = 1;
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}
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else {
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if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0)
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err(1, "getmntinfo");
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for (i = 0; i < mntsize; i++) {
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if (checkvfsname(mntbuf[i].f_fstypename,
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vfslist))
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continue;
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prmount(&mntbuf[i]);
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}
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}
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exit(rval);
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/* NOTREACHED */
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case 1:
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if (vfslist != NULL) {
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usage();
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/* NOTREACHED */
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}
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/*
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* Create a canonical version of the device or mount path
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* passed to us. It's ok for this to fail. It's also ok
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* for the result to be exactly the same as the original.
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*/
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canonical_path = realpath(*argv, canonical_path_buf);
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if (init_flags & MNT_UPDATE) {
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/*
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* Try looking up the canonical path first,
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* then try exactly what the user entered.
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*/
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if ((canonical_path == NULL ||
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(mntbuf = getmntpt(canonical_path)) == NULL) &&
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(mntbuf = getmntpt(*argv)) == NULL
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)
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{
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errx(1,
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"unknown special file or file system %s.",
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*argv);
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}
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mntfromname = mntbuf->f_mntfromname;
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if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) {
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if (strcmp(fs->fs_spec, "from_mount") != 0)
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mntfromname = fs->fs_spec;
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/* ignore the fstab file options. */
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fs->fs_mntops = NULL;
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}
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mntonname = mntbuf->f_mntonname;
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fstypename = mntbuf->f_fstypename;
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mountopts = NULL;
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} else {
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/*
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* Try looking up the canonical path first,
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* then try exactly what the user entered.
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*/
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if (canonical_path == NULL ||
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((fs = getfsfile(canonical_path)) == NULL &&
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(fs = getfsspec(canonical_path)) == NULL))
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{
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if ((fs = getfsfile(*argv)) == NULL &&
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(fs = getfsspec(*argv)) == NULL)
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{
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errx(1,
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"%s: unknown special file or file system.",
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*argv);
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}
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}
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if (BADTYPE(fs->fs_type))
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errx(1, "%s has unknown file system type.",
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*argv);
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if (strcmp(fs->fs_spec, "from_mount") == 0) {
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if ((canonical_path == NULL ||
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(mntbuf = getmntpt(canonical_path)) == NULL) &&
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(mntbuf = getmntpt(*argv)) == NULL
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)
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{
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errx(1,
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"unknown special file or file system %s.",
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*argv);
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}
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mntfromname = mntbuf->f_mntfromname;
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} else
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mntfromname = fs->fs_spec;
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mntonname = fs->fs_file;
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fstypename = fs->fs_vfstype;
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mountopts = fs->fs_mntops;
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}
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rval = mountfs(fstypename, mntfromname,
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mntonname, init_flags, options, mountopts, 0, NULL, 0);
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break;
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case 2:
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/*
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* If -t flag has not been specified, and spec contains either
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* a ':' or a '@' then assume that an NFS filesystem is being
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* specified ala Sun.
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*/
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if (vfslist == NULL) {
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if (strpbrk(argv[0], ":@") != NULL)
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vfstype = "nfs";
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else {
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vfstype = getfslab(argv[0]);
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if (vfstype == NULL)
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vfstype = ffs_fstype;
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}
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}
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rval = mountfs(vfstype,
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argv[0], argv[1], init_flags, options, NULL, 0, NULL, 0);
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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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/*
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* If the mount was successfully, and done by root, tell mountd the
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* good news. Pid checks are probably unnecessary, but don't hurt.
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*/
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if (rval == 0 && getuid() == 0 &&
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(mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) {
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int pid;
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if (fscanf(mountdfp, "%d", &pid) == 1 &&
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pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH)
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err(1, "signal mountd");
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(void)fclose(mountdfp);
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}
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exit(rval);
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/* NOTREACHED */
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}
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int
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hasopt(const char *mntopts, const char *option)
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{
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int negative, found;
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char *opt, *optbuf;
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if (option[0] == 'n' && option[1] == 'o') {
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negative = 1;
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option += 2;
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} else
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negative = 0;
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optbuf = strdup(mntopts);
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found = 0;
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for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
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if (opt[0] == 'n' && opt[1] == 'o') {
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if (!strcasecmp(opt + 2, option))
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found = negative;
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} else if (!strcasecmp(opt, option))
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found = !negative;
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}
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free(optbuf);
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return (found);
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}
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static int
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mountfs(const char *vfstype, const char *spec, const char *name,
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int flags, const char *options, const char *mntopts,
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int skipmounted, char *buf, size_t buflen)
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{
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/* List of directories containing mount_xxx subcommands. */
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static const char *edirs[] = {
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#ifdef RESCUEDIR
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RESCUEDIR,
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#endif
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_PATH_SBIN,
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_PATH_USRSBIN,
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NULL
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};
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const char **argv, **edir;
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struct statvfs *sfp, sf;
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pid_t pid;
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int pfd[2];
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int argc, numfs, i, status, maxargc;
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char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN],
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mntpath[MAXPATHLEN];
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#ifdef __GNUC__
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(void) &name;
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(void) &optbuf;
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(void) &vfstype;
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#endif
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if (realpath(name, mntpath) == NULL) {
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warn("realpath %s", name);
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return (1);
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}
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name = mntpath;
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optbuf = NULL;
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if (mntopts)
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catopt(&optbuf, mntopts);
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if (options)
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catopt(&optbuf, options);
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if (!mntopts && !options)
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catopt(&optbuf, "rw");
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if (!strcmp(name, "/"))
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flags |= MNT_UPDATE;
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else if (skipmounted) {
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if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) {
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warn("getmntinfo");
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return (1);
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}
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for(i = 0; i < numfs; i++) {
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/*
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* XXX can't check f_mntfromname,
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* thanks to mfs, union, etc.
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*/
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if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 &&
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strncmp(vfstype, sfp[i].f_fstypename,
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MFSNAMELEN) == 0) {
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if (verbose)
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(void)printf("%s on %s type %.*s: "
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"%s\n",
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sfp[i].f_mntfromname,
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sfp[i].f_mntonname,
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MFSNAMELEN,
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sfp[i].f_fstypename,
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"already mounted");
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return (0);
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}
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}
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}
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if (flags & MNT_FORCE)
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catopt(&optbuf, "force");
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if (flags & MNT_RDONLY)
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catopt(&optbuf, "ro");
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if (flags & MNT_UPDATE) {
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catopt(&optbuf, "update");
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/* Figure out the fstype only if we defaulted to ffs */
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if (vfstype == ffs_fstype && statvfs(name, &sf) != -1)
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vfstype = sf.f_fstypename;
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}
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maxargc = 64;
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argv = malloc(sizeof(char *) * maxargc);
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(void) snprintf(execbase, sizeof(execbase), "mount_%s", vfstype);
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argc = 0;
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argv[argc++] = execbase;
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if (optbuf)
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mangle(optbuf, &argc, &argv, &maxargc);
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argv[argc++] = spec;
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argv[argc++] = name;
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argv[argc] = NULL;
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if (verbose && buf == NULL) {
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(void)printf("exec:");
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for (i = 0; i < argc; i++)
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(void)printf(" %s", argv[i]);
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(void)printf("\n");
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}
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if (buf) {
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if (pipe(pfd) == -1)
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warn("Cannot create pipe");
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}
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switch (pid = vfork()) {
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case -1: /* Error. */
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warn("vfork");
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if (optbuf)
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free(optbuf);
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return (1);
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case 0: /* Child. */
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if (debug)
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_exit(0);
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if (buf) {
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(void)close(pfd[0]);
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(void)close(STDOUT_FILENO);
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if (dup2(pfd[1], STDOUT_FILENO) == -1)
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warn("Cannot open fd to mount program");
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}
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/* Go find an executable. */
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edir = edirs;
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do {
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(void)snprintf(execname,
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sizeof(execname), "%s/%s", *edir, execbase);
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(void)execv(execname, __UNCONST(argv));
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if (errno != ENOENT)
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warn("exec %s for %s", execname, name);
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} while (*++edir != NULL);
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if (errno == ENOENT)
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warnx("%s not found for %s", execbase, name);
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_exit(1);
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/* NOTREACHED */
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default: /* Parent. */
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if (optbuf)
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free(optbuf);
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if (buf || (options != NULL &&
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strstr(options, "getargs") != NULL)) {
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char tbuf[1024], *ptr;
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int nread;
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if (buf == NULL) {
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ptr = tbuf;
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buflen = sizeof(tbuf) - 1;
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} else {
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ptr = buf;
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buflen--;
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}
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(void)close(pfd[1]);
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(void)signal(SIGPIPE, SIG_IGN);
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while ((nread = read(pfd[0], ptr, buflen)) > 0) {
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buflen -= nread;
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ptr += nread;
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}
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*ptr = '\0';
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if (buflen == 0) {
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while (read(pfd[0], &nread, sizeof(nread)) > 0)
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continue;
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}
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if (buf == NULL)
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(void)fprintf(stdout, "%s", tbuf);
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}
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if (waitpid(pid, &status, 0) < 0) {
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warn("waitpid");
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return (1);
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}
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if (WIFEXITED(status)) {
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if (WEXITSTATUS(status) != 0)
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return (WEXITSTATUS(status));
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} else if (WIFSIGNALED(status)) {
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warnx("%s: %s", name, strsignal(WTERMSIG(status)));
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return (1);
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}
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if (buf == NULL) {
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if (verbose) {
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if (statvfs(name, &sf) < 0) {
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warn("statvfs %s", name);
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return (1);
|
|
}
|
|
prmount(&sf);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
prmount(struct statvfs *sfp)
|
|
{
|
|
int flags;
|
|
const struct opt *o;
|
|
struct passwd *pw;
|
|
int f;
|
|
|
|
(void)printf("%s on %s type %.*s", sfp->f_mntfromname,
|
|
sfp->f_mntonname, MFSNAMELEN, sfp->f_fstypename);
|
|
|
|
flags = sfp->f_flag & MNT_VISFLAGMASK;
|
|
for (f = 0, o = optnames; flags && o <
|
|
&optnames[sizeof(optnames)/sizeof(optnames[0])]; o++)
|
|
if (flags & o->o_opt) {
|
|
if (!o->o_silent || verbose)
|
|
(void)printf("%s%s", !f++ ? " (" : ", ",
|
|
o->o_name);
|
|
flags &= ~o->o_opt;
|
|
}
|
|
if (flags)
|
|
(void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ",
|
|
flags & (flags - 1) ? "s" : "", flags);
|
|
if (sfp->f_owner) {
|
|
(void)printf("%smounted by ", !f++ ? " (" : ", ");
|
|
if ((pw = getpwuid(sfp->f_owner)) != NULL)
|
|
(void)printf("%s", pw->pw_name);
|
|
else
|
|
(void)printf("%d", sfp->f_owner);
|
|
}
|
|
if (verbose)
|
|
(void)printf("%sfsid: 0x%x/0x%x",
|
|
!f++ ? " (" /* ) */: ", ",
|
|
sfp->f_fsidx.__fsid_val[0], sfp->f_fsidx.__fsid_val[1]);
|
|
|
|
if (verbose) {
|
|
(void)printf("%s", !f++ ? " (" : ", ");
|
|
(void)printf("reads: sync %" PRIu64 " async %" PRIu64 "",
|
|
sfp->f_syncreads, sfp->f_asyncreads);
|
|
(void)printf(", writes: sync %" PRIu64 " async %" PRIu64 "",
|
|
sfp->f_syncwrites, sfp->f_asyncwrites);
|
|
if (verbose > 1) {
|
|
char buf[2048];
|
|
|
|
if (getmntargs(sfp, buf, sizeof(buf)))
|
|
printf(", [%s: %s]", sfp->f_fstypename, buf);
|
|
}
|
|
printf(")\n");
|
|
} else
|
|
(void)printf("%s", f ? ")\n" : "\n");
|
|
}
|
|
|
|
static int
|
|
getmntargs(struct statvfs *sfs, char *buf, size_t buflen)
|
|
{
|
|
|
|
if (mountfs(sfs->f_fstypename, sfs->f_mntfromname, sfs->f_mntonname, 0,
|
|
"getargs", NULL, 0, buf, buflen))
|
|
return (0);
|
|
else {
|
|
if (*buf == '\0')
|
|
return (0);
|
|
if ((buf = strchr(buf, '\n')) != NULL)
|
|
*buf = '\0';
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
static struct statvfs *
|
|
getmntpt(const char *name)
|
|
{
|
|
struct statvfs *mntbuf;
|
|
int i, mntsize;
|
|
|
|
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
|
|
for (i = 0; i < mntsize; i++)
|
|
if (strcmp(mntbuf[i].f_mntfromname, name) == 0 ||
|
|
strcmp(mntbuf[i].f_mntonname, name) == 0)
|
|
return (&mntbuf[i]);
|
|
return (NULL);
|
|
}
|
|
|
|
static void
|
|
catopt(char **sp, const char *o)
|
|
{
|
|
char *s, *n;
|
|
|
|
s = *sp;
|
|
if (s) {
|
|
if (asprintf(&n, "%s,%s", s, o) < 0)
|
|
err(1, "asprintf");
|
|
free(s);
|
|
s = n;
|
|
} else
|
|
s = strdup(o);
|
|
*sp = s;
|
|
}
|
|
|
|
static void
|
|
mangle(char *options, int *argcp, const char ***argvp, int *maxargcp)
|
|
{
|
|
char *p, *s;
|
|
int argc, maxargc;
|
|
const char **argv, **nargv;
|
|
|
|
argc = *argcp;
|
|
argv = *argvp;
|
|
maxargc = *maxargcp;
|
|
|
|
for (s = options; (p = strsep(&s, ",")) != NULL;) {
|
|
/* Always leave space for one more argument and the NULL. */
|
|
if (argc >= maxargc - 4) {
|
|
nargv = realloc(argv, (maxargc << 1) * sizeof(char *));
|
|
if (!nargv)
|
|
err(1, "realloc");
|
|
argv = nargv;
|
|
maxargc <<= 1;
|
|
}
|
|
if (*p != '\0') {
|
|
if (*p == '-') {
|
|
argv[argc++] = p;
|
|
p = strchr(p, '=');
|
|
if (p) {
|
|
*p = '\0';
|
|
argv[argc++] = p+1;
|
|
}
|
|
} else if (strcmp(p, "rw") != 0) {
|
|
argv[argc++] = "-o";
|
|
argv[argc++] = p;
|
|
}
|
|
}
|
|
}
|
|
|
|
*argcp = argc;
|
|
*argvp = argv;
|
|
*maxargcp = maxargc;
|
|
}
|
|
|
|
/* Deduce the filesystem type from the disk label. */
|
|
static const char *
|
|
getfslab(const char *str)
|
|
{
|
|
static struct dkwedge_info dkw;
|
|
struct disklabel dl;
|
|
int fd;
|
|
int part;
|
|
const char *vfstype;
|
|
u_char fstype;
|
|
char buf[MAXPATHLEN + 1];
|
|
char *sp, *ep;
|
|
|
|
if ((fd = open(str, O_RDONLY)) == -1) {
|
|
/*
|
|
* Iff we get EBUSY try the raw device. Since mount always uses
|
|
* the block device we know we are never passed a raw device.
|
|
*/
|
|
if (errno != EBUSY)
|
|
err(1, "cannot open `%s'", str);
|
|
strlcpy(buf, str, MAXPATHLEN);
|
|
if ((sp = strrchr(buf, '/')) != NULL)
|
|
++sp;
|
|
else
|
|
sp = buf;
|
|
for (ep = sp + strlen(sp) + 1; ep > sp; ep--)
|
|
*ep = *(ep - 1);
|
|
*sp = 'r';
|
|
|
|
/* Silently fail here - mount call can display error */
|
|
if ((fd = open(buf, O_RDONLY)) == -1)
|
|
return (NULL);
|
|
}
|
|
|
|
/* Check to see if this is a wedge. */
|
|
if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) {
|
|
/* Yup, this is easy. */
|
|
(void) close(fd);
|
|
return (dkw.dkw_ptype);
|
|
}
|
|
|
|
if (ioctl(fd, DIOCGDINFO, &dl) == -1) {
|
|
(void) close(fd);
|
|
return (NULL);
|
|
}
|
|
|
|
(void) close(fd);
|
|
|
|
part = str[strlen(str) - 1] - 'a';
|
|
|
|
if (part < 0 || part >= dl.d_npartitions)
|
|
return (NULL);
|
|
|
|
/* Return NULL for unknown types - caller can fall back to ffs */
|
|
if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES)
|
|
vfstype = NULL;
|
|
else
|
|
vfstype = mountnames[fstype];
|
|
|
|
return (vfstype);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
(void)fprintf(stderr,
|
|
"usage: mount %s\n mount %s\n mount %s\n",
|
|
"[-Aadfruvw] [-t type]",
|
|
"[-dfruvw] special | node",
|
|
"[-dfruvw] [-o options] [-t type] special node");
|
|
exit(1);
|
|
/* NOTREACHED */
|
|
}
|