144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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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) 1992, 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_null.c 8.6 (Berkeley) 4/26/95";
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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/uio.h>
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#include <err.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 <sysexits.h>
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#include <unistd.h>
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#include "mntopts.h"
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struct mntopt mopts[] = {
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MOPT_STDOPTS,
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{ NULL }
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};
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int subdir(const char *, const char *);
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static void usage(void) __dead2;
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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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struct iovec iov[6];
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int ch, mntflags;
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char source[MAXPATHLEN];
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char target[MAXPATHLEN];
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mntflags = 0;
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while ((ch = getopt(argc, argv, "o:")) != -1)
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switch(ch) {
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case 'o':
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getmntopts(optarg, mopts, &mntflags, 0);
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 2)
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usage();
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/* resolve target and source with realpath(3) */
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(void)checkpath(argv[0], target);
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(void)checkpath(argv[1], source);
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if (subdir(target, source) || subdir(source, target))
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errx(EX_USAGE, "%s (%s) and %s are not distinct paths",
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argv[0], target, argv[1]);
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iov[0].iov_base = "fstype";
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iov[0].iov_len = sizeof("fstype");
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iov[1].iov_base = "nullfs";
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iov[1].iov_len = strlen(iov[1].iov_base) + 1;
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iov[2].iov_base = "fspath";
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iov[2].iov_len = sizeof("fspath");
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iov[3].iov_base = source;
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iov[3].iov_len = strlen(source) + 1;
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iov[4].iov_base = "target";
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iov[4].iov_len = sizeof("target");
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iov[5].iov_base = target;
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iov[5].iov_len = strlen(target) + 1;
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if (nmount(iov, 6, mntflags))
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err(1, NULL);
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exit(0);
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}
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int
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subdir(p, dir)
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const char *p;
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const char *dir;
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{
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int l;
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l = strlen(dir);
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if (l <= 1)
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return (1);
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if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
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return (1);
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return (0);
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}
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static void
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usage()
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{
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(void)fprintf(stderr,
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"usage: mount_nullfs [-o options] target_fs mount_point\n");
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exit(1);
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}
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