131 lines
4.2 KiB
C
131 lines
4.2 KiB
C
/*
|
|
* Copyright (c) 2003 Networks Associates Technology, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed for the FreeBSD Project by Marshall
|
|
* Kirk McKusick and Network Associates Laboratories, the Security
|
|
* Research Division of Network Associates, Inc. under DARPA/SPAWAR
|
|
* contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
|
|
* research program.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The names of the authors may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/stat.h>
|
|
#include <ufs/ufs/ufsmount.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <grp.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sysexits.h>
|
|
#include <unistd.h>
|
|
|
|
void usage(void);
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
char *dir, *cp, path[PATH_MAX];
|
|
struct statfs stfsbuf;
|
|
struct ufs_args args;
|
|
struct group *grp;
|
|
struct stat stbuf;
|
|
int fd;
|
|
|
|
if (argc != 3)
|
|
usage();
|
|
|
|
dir = argv[1];
|
|
memset(&args, 0, sizeof args);
|
|
args.fspec = argv[2];
|
|
|
|
/*
|
|
* Check that the user running this program has permission
|
|
* to create and remove a snapshot file from the directory
|
|
* in which they have requested to have it made. If the
|
|
* directory is sticky and not owned by the user, then they
|
|
* will not be able to remove the snapshot when they are
|
|
* done with it.
|
|
*/
|
|
if (strlen(args.fspec) >= PATH_MAX)
|
|
errx(1, "pathname too long %s", args.fspec);
|
|
cp = strrchr(args.fspec, '/');
|
|
if (cp == NULL) {
|
|
strlcpy(path, ".", PATH_MAX);
|
|
} else if (cp == args.fspec) {
|
|
strlcpy(path, "/", PATH_MAX);
|
|
} else {
|
|
strlcpy(path, args.fspec, cp - args.fspec + 1);
|
|
}
|
|
if (statfs(path, &stfsbuf) < 0)
|
|
err(1, "%s", path);
|
|
if (stat(path, &stbuf) < 0)
|
|
err(1, "%s", path);
|
|
if (!S_ISDIR(stbuf.st_mode))
|
|
errx(1, "%s: Not a directory", path);
|
|
if (access(path, W_OK) < 0)
|
|
err(1, "Lack write permission in %s", path);
|
|
if ((stbuf.st_mode & S_ISTXT) && stbuf.st_uid != getuid())
|
|
errx(1, "Lack write permission in %s: Sticky bit set", path);
|
|
|
|
/*
|
|
* Having verified access to the directory in which the
|
|
* snapshot is to be built, proceed with creating it.
|
|
*/
|
|
if ((grp = getgrnam("operator")) == NULL)
|
|
errx(1, "Cannot retrieve operator gid");
|
|
if (mount("ufs", dir, MNT_UPDATE | MNT_SNAPSHOT | stfsbuf.f_flags,
|
|
&args) < 0)
|
|
err(1, "Cannot create %s", args.fspec);
|
|
if ((fd = open(args.fspec, O_RDONLY)) < 0)
|
|
err(1, "Cannot open %s", args.fspec);
|
|
if (fstat(fd, &stbuf) != 0)
|
|
err(1, "Cannot stat %s", args.fspec);
|
|
if ((stbuf.st_flags & SF_SNAPSHOT) == 0)
|
|
errx(1, "File %s is not a snapshot", args.fspec);
|
|
if (fchown(fd, -1, grp->gr_gid) != 0)
|
|
err(1, "Cannot chown %s", args.fspec);
|
|
if (fchmod(fd, S_IRUSR | S_IRGRP) != 0)
|
|
err(1, "Cannot chmod %s", args.fspec);
|
|
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
|
|
fprintf(stderr, "usage: mksnap_ffs mountpoint snapshot_name\n");
|
|
exit(EX_USAGE);
|
|
}
|