Add the mksnap_ffs command to the sbin directory. This setuid root

program allows users in the operator group to take filesystem
snapshots. Its first use will be in support of `dump -L'.

Approved by:	Technical Review Board <trb@FreeBSD.org>
Sponsored by:   DARPA & NAI Labs.

4 files changed, 172 insertions, 0 deletions

diff --git a/sbin/Makefile b/sbin/Makefile
index 3a656fca4d3e..17ecce4037ed 100644
--- a/sbin/Makefile
+++ b/sbin/Makefile
@@ -38,6 +38,7 @@ SUBDIR=	adjkerntz \
 	mdconfig \
 	mdmfs \
 	mknod \
+	mksnap_ffs \
 	mount \
 	mount_cd9660 \
 	mount_ext2fs \
diff --git a/sbin/mksnap_ffs/Makefile b/sbin/mksnap_ffs/Makefile
new file mode 100644
index 000000000000..3c08f565225d
--- /dev/null
+++ b/sbin/mksnap_ffs/Makefile
@@ -0,0 +1,14 @@
+# $FreeBSD$
+
+PROG=	mksnap_ffs
+MAN=	mksnap_ffs.8
+
+.if defined(NOSUID)
+BINMODE=550
+.else
+BINMODE=4550
+BINOWN=	root
+.endif
+BINGRP=	operator
+
+.include <bsd.prog.mk>
diff --git a/sbin/mksnap_ffs/mksnap_ffs.8 b/sbin/mksnap_ffs/mksnap_ffs.8
new file mode 100644
index 000000000000..b20e435a0791
--- /dev/null
+++ b/sbin/mksnap_ffs/mksnap_ffs.8
@@ -0,0 +1,75 @@
+.\"
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 19, 2003
+.Dt MKSNAP_FFS 8
+.Os
+.Sh NAME
+.Nm mksnap_ffs
+.Nd take a filesystem snapshot
+.Sh SYNOPSIS
+.Nm
+.Ar mountpoint
+.Ar snapshot_name
+.Sh DESCRIPTION
+The
+.Nm
+command creates a snapshot named
+.Ar snapshot_name
+on the filesystem mounted at
+.Ar mountpoint .
+The
+.Ar snapshot_name
+argument must be contained within the filesystem mounted at
+.Ar mountpoint .
+.Pp
+The group ownership of the file is set to
+.Dq operator ;
+the owner of the file remains
+.Dq root .
+The mode of the snapshot is set to be readable by the owner
+or members of the
+.Dq operator
+group.
+.Sh SEE ALSO
+.Xr chmod 2 ,
+.Xr chown 8 ,
+.Xr mount_ffs 8
+.Sh HISTORY
+A
+.Nm
+command first appeared in
+.Fx 5.0 .
diff --git a/sbin/mksnap_ffs/mksnap_ffs.c b/sbin/mksnap_ffs/mksnap_ffs.c
new file mode 100644
index 000000000000..8f33cde47471
--- /dev/null
+++ b/sbin/mksnap_ffs/mksnap_ffs.c
@@ -0,0 +1,82 @@
+/*
+ * 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 <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+void
+usage()
+{
+
+	fprintf(stderr, "usage: mksnap_ffs mountpoint file\n");
+	exit(EX_USAGE);
+}
+
+int
+main(int argc, char **argv)
+{
+	const char *dir;
+	struct ufs_args args;
+	struct group *grp;
+
+	if (argc != 3)
+		usage();
+
+	dir = argv[1];
+	args.fspec = argv[2];
+
+	if ((grp = getgrnam("operator")) == NULL)
+		errx(1, "Cannot retrieve operator gid");
+	if (mount("ffs", dir, MNT_UPDATE | MNT_SNAPSHOT, &args) < 0)
+		err(1, "Cannot create %s", args.fspec);
+	if (chown(args.fspec, -1, grp->gr_gid) != 0)
+		err(1, "Cannot chown %s", args.fspec);
+	if (chmod(args.fspec, S_IRUSR | S_IRGRP) != 0)
+		err(1, "Cannot chmod %s", args.fspec);
+
+	exit(EXIT_SUCCESS);
+}