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7f79e870d2
- Ensure that the error message is NUL-terminated before printing it. PR: bin/147482 MFC after: 2 weeks
143 lines
4.6 KiB
C
143 lines
4.6 KiB
C
/*
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* Copyright (c) 2003 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Marshall
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* Kirk McKusick and Network Associates Laboratories, the Security
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* Research Division of Network Associates, Inc. under DARPA/SPAWAR
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* contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
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* research program.
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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. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <ufs/ufs/ufsmount.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <limits.h>
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#include <mntopts.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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static void
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usage(void)
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{
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errx(EX_USAGE, "usage: mksnap_ffs snapshot_name");
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}
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int
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main(int argc, char **argv)
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{
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char errmsg[255], path[PATH_MAX];
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char *cp, *snapname;
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struct statfs stfsbuf;
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struct group *grp;
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struct stat stbuf;
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struct iovec *iov;
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int fd, iovlen;
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if (argc == 2)
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snapname = argv[1];
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else if (argc == 3)
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snapname = argv[2]; /* Old usage. */
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else
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usage();
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/*
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* Check that the user running this program has permission
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* to create and remove a snapshot file from the directory
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* in which they have requested to have it made. If the
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* directory is sticky and not owned by the user, then they
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* will not be able to remove the snapshot when they are
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* done with it.
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*/
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if (strlen(snapname) >= PATH_MAX)
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errx(1, "pathname too long %s", snapname);
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cp = strrchr(snapname, '/');
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if (cp == NULL) {
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strlcpy(path, ".", PATH_MAX);
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} else if (cp == snapname) {
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strlcpy(path, "/", PATH_MAX);
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} else {
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strlcpy(path, snapname, cp - snapname + 1);
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}
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if (statfs(path, &stfsbuf) < 0)
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err(1, "%s", path);
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if (stat(path, &stbuf) < 0)
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err(1, "%s", path);
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if (!S_ISDIR(stbuf.st_mode))
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errx(1, "%s: Not a directory", path);
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if (access(path, W_OK) < 0)
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err(1, "Lack write permission in %s", path);
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if ((stbuf.st_mode & S_ISTXT) && stbuf.st_uid != getuid())
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errx(1, "Lack write permission in %s: Sticky bit set", path);
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/*
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* Having verified access to the directory in which the
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* snapshot is to be built, proceed with creating it.
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*/
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if ((grp = getgrnam("operator")) == NULL)
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errx(1, "Cannot retrieve operator gid");
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iov = NULL;
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iovlen = 0;
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build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
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build_iovec(&iov, &iovlen, "from", snapname, (size_t)-1);
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build_iovec(&iov, &iovlen, "fspath", stfsbuf.f_mntonname, (size_t)-1);
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build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
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build_iovec(&iov, &iovlen, "update", NULL, 0);
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build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
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*errmsg = '\0';
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if (nmount(iov, iovlen, stfsbuf.f_flags) < 0) {
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errmsg[sizeof(errmsg) - 1] = '\0';
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err(1, "Cannot create snapshot %s%s%s", snapname,
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*errmsg != '\0' ? ": " : "", errmsg);
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}
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if ((fd = open(snapname, O_RDONLY)) < 0)
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err(1, "Cannot open %s", snapname);
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if (fstat(fd, &stbuf) != 0)
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err(1, "Cannot stat %s", snapname);
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if ((stbuf.st_flags & SF_SNAPSHOT) == 0)
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errx(1, "File %s is not a snapshot", snapname);
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if (fchown(fd, -1, grp->gr_gid) != 0)
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err(1, "Cannot chown %s", snapname);
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if (fchmod(fd, S_IRUSR | S_IRGRP) != 0)
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err(1, "Cannot chmod %s", snapname);
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exit(EXIT_SUCCESS);
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}
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