/*	$OpenBSD: vnconfig.c,v 1.16 2004/09/14 22:35:51 deraadt Exp $	*/
/*
 * Copyright (c) 1993 University of Utah.
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 * from: Utah $Hdr: vnconfig.c 1.1 93/12/15$
 *
 *	@(#)vnconfig.c	8.1 (Berkeley) 12/15/93
 */

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>

#include <dev/vndioctl.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

#define DEFAULT_VND	"vnd0"

#define VND_CONFIG	1
#define VND_UNCONFIG	2
#define VND_GET		3

int verbose = 0;

__dead void usage(void);
int config(char *, char *, int, char *);
int getinfo(const char *);

int
main(int argc, char **argv)
{
	int ch, rv, action = VND_CONFIG;
	char *key = NULL;

	while ((ch = getopt(argc, argv, "cluvk")) != -1) {
		switch (ch) {
		case 'c':
			action = VND_CONFIG;
			break;
		case 'l':
			action = VND_GET;
			break;
		case 'u':
			action = VND_UNCONFIG;
			break;
		case 'v':
			verbose = 1;
			break;
		case 'k':
			key = getpass("Encryption key: ");
			break;
		default:
			usage();
			/* NOTREACHED */
		}
	}

	argc -= optind;
	argv += optind;

	if (action == VND_CONFIG && argc == 2)
		rv = config(argv[0], argv[1], action, key);
	else if (action == VND_UNCONFIG && argc == 1)
		rv = config(argv[0], NULL, action, key);
	else if (action == VND_GET)
		rv = getinfo(argc ? argv[0] : NULL);
	else
		usage();

	exit(rv);
}

int
getinfo(const char *vname)
{
	int vd, print_all = 0;
	struct vnd_user vnu;

	if (vname == NULL) {
		vname = DEFAULT_VND;
		print_all = 1;
	}

	vd = opendev((char *)vname, O_RDONLY, OPENDEV_PART, NULL);
	if (vd < 0)
		err(1, "open: %s", vname);

	vnu.vnu_unit = -1;

query:
	if (ioctl(vd, VNDIOCGET, &vnu) == -1) {
		close(vd);
		return (!(errno == ENXIO && print_all));
	}

	fprintf(stdout, "vnd%d: ", vnu.vnu_unit);

	if (!vnu.vnu_ino)
		fprintf(stdout, "not in use\n");
	else
		fprintf(stdout, "covering %s on %s, inode %d\n", vnu.vnu_file,
		    devname(vnu.vnu_dev, S_IFBLK), vnu.vnu_ino);

	if (print_all) {
		vnu.vnu_unit++;
		goto query;
	}

	close(vd);

	return (0);
}

int
config(char *dev, char *file, int action, char *key)
{
	struct vnd_ioctl vndio;
	FILE *f;
	char *rdev;
	int rv;

	if (opendev(dev, O_RDWR, OPENDEV_PART, &rdev) < 0)
		err(4, "%s", rdev);
	f = fopen(rdev, "rw");
	if (f == NULL) {
		warn("%s", rdev);
		rv = -1;
		goto out;
	}
	vndio.vnd_file = file;
	vndio.vnd_key = (u_char *)key;
	vndio.vnd_keylen = key == NULL ? 0 : strlen(key);

	/*
	 * Clear (un-configure) the device
	 */
	if (action == VND_UNCONFIG) {
		rv = ioctl(fileno(f), VNDIOCCLR, &vndio);
		if (rv)
			warn("VNDIOCCLR");
		else if (verbose)
			printf("%s: cleared\n", dev);
	}
	/*
	 * Configure the device
	 */
	if (action == VND_CONFIG) {
		rv = ioctl(fileno(f), VNDIOCSET, &vndio);
		if (rv)
			warn("VNDIOCSET");
		else if (verbose)
			printf("%s: %llu bytes on %s\n", dev, vndio.vnd_size,
			    file);
	}

	fclose(f);
	fflush(stdout);
 out:
	if (key)
		memset(key, 0, strlen(key));
	return (rv < 0);
}

__dead void
usage(void)
{
	extern char *__progname;

	(void)fprintf(stderr,
	    "usage: %s [-c] [-vk] rawdev regular-file\n"
	    "       %s -u [-v] rawdev\n"
	    "       %s -l [rawdev]\n", __progname, __progname, __progname);
	exit(1);
}