mksnap_ffs.c revision 111725 
138032Speter/*
238032Speter * Copyright (c) 2003 Networks Associates Technology, Inc.
338032Speter * All rights reserved.
438032Speter *
538032Speter * This software was developed for the FreeBSD Project by Marshall
638032Speter * Kirk McKusick and Network Associates Laboratories, the Security
7 * Research Division of Network Associates, Inc. under DARPA/SPAWAR
8 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
9 * research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD: head/sbin/mksnap_ffs/mksnap_ffs.c 111725 2003-03-02 08:07:57Z mckusick $
36 */
37
38#include <sys/param.h>
39#include <sys/mount.h>
40#include <sys/stat.h>
41#include <ufs/ufs/ufsmount.h>
42#include <err.h>
43#include <errno.h>
44#include <fcntl.h>
45#include <grp.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <sysexits.h>
50#include <unistd.h>
51
52void
53usage()
54{
55
56	fprintf(stderr, "usage: mksnap_ffs mountpoint file\n");
57	exit(EX_USAGE);
58}
59
60int
61main(int argc, char **argv)
62{
63	const char *dir;
64	struct ufs_args args;
65	struct group *grp;
66	struct stat stbuf;
67	int fd;
68
69	if (argc != 3)
70		usage();
71
72	dir = argv[1];
73	args.fspec = argv[2];
74
75	if ((grp = getgrnam("operator")) == NULL)
76		errx(1, "Cannot retrieve operator gid");
77	if (mount("ffs", dir, MNT_UPDATE | MNT_SNAPSHOT, &args) < 0)
78		err(1, "Cannot create %s", args.fspec);
79	if ((fd = open(args.fspec, O_RDONLY)) < 0)
80		err(1, "Cannot open %s", args.fspec);
81	if (fstat(fd, &stbuf) != 0)
82		err(1, "Cannot stat %s", args.fspec);
83	if ((stbuf.st_flags & SF_SNAPSHOT) == 0)
84		errx(1, "File %s is not a snapshot", args.fspec);
85	if (fchown(fd, -1, grp->gr_gid) != 0)
86		err(1, "Cannot chown %s", args.fspec);
87	if (fchmod(fd, S_IRUSR | S_IRGRP) != 0)
88		err(1, "Cannot chmod %s", args.fspec);
89
90	exit(EXIT_SUCCESS);
91}
92