HardenedBSD/usr.sbin/vnconfig/vnconfig.c

/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 <stdio.h>
#include <errno.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/vnioctl.h>

#define MAXVNDISK	16
#define LINESIZE	1024

struct vndisk {
	char	*dev;
	char	*file;
	int	flags;
	char	*oarg;
} vndisks[MAXVNDISK];

#define VN_CONFIG	0x01
#define VN_UNCONFIG	0x02
#define VN_ENABLE	0x04
#define VN_DISABLE	0x08
#define	VN_SWAP		0x10
#define VN_MOUNTRO	0x20
#define VN_MOUNTRW	0x40
#define VN_IGNORE	0x80

int nvndisks;

int all = 0;
int verbose = 0;
char *configfile;
char *pname;

char *malloc(), *rawdevice(), *rindex();

main(argc, argv)
	char **argv;
{
	extern int optind, optopt, opterr;
	extern char *optarg;
	register int i, rv;
	int flags = 0;

	pname = argv[0];
	configfile = _PATH_VNTAB;
	while ((i = getopt(argc, argv, "acdef:uv")) != EOF)
		switch (i) {

		/* all -- use config file */
		case 'a':
			all++;
			break;

		/* configure */
		case 'c':
			flags |= VN_CONFIG;
			flags &= ~VN_UNCONFIG;
			break;

		/* disable */
		case 'd':
			flags |= VN_DISABLE;
			flags &= ~VN_ENABLE;
			break;

		/* enable */
		case 'e':
			flags |= (VN_ENABLE|VN_CONFIG);
			flags &= ~(VN_DISABLE|VN_UNCONFIG);
			break;

		/* alternate config file */
		case 'f':
			configfile = optarg;
			break;

		/* unconfigure */
		case 'u':
			flags |= (VN_DISABLE|VN_UNCONFIG);
			flags &= ~(VN_ENABLE|VN_CONFIG);
			break;

		/* verbose */
		case 'v':
			verbose++;
			break;

		default:
			fprintf(stderr, "invalid option '%c'\n", optopt);
			usage();
		}

	if (flags == 0)
		flags = VN_CONFIG;
	if (all)
		readconfig(flags);
	else {
		if (argc < optind + 1)
			usage();
		vndisks[0].dev = argv[optind++];
		vndisks[0].file = argv[optind++];
		vndisks[0].flags = flags;
		if (optind < argc)
			getoptions(&vndisks[0], argv[optind]);
		nvndisks = 1;
	}
	rv = 0;
	for (i = 0; i < nvndisks; i++)
		rv += config(&vndisks[i]);
	exit(rv);
}

config(vnp)
	struct vndisk *vnp;
{
	char *dev, *file, *oarg;
	int flags;
	struct vn_ioctl vnio;
	register int rv;
	char *rdev;
	FILE *f;
	extern int errno;

	dev = vnp->dev;
	file = vnp->file;
	flags = vnp->flags;
	oarg = vnp->oarg;

	if (flags & VN_IGNORE)
		return(0);

	rdev = rawdevice(dev);
	f = fopen(rdev, "rw");
	if (f == NULL) {
		perror("open");
		return(1);
	}
	vnio.vn_file = file;

	/*
	 * Disable the device
	 */
	if (flags & VN_DISABLE) {
		if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
			rv = unmount(oarg, 0);
			if (rv) {
				if (errno == EBUSY)
					flags &= ~VN_UNCONFIG;
				if ((flags & VN_UNCONFIG) == 0)
					perror("umount");
			} else if (verbose)
				printf("%s: unmounted\n", dev);
		}
	}
	/*
	 * Clear (un-configure) the device
	 */
	if (flags & VN_UNCONFIG) {
		rv = ioctl(fileno(f), VNIOCCLR, &vnio);
		if (rv) {
			if (errno == ENODEV) {
				if (verbose)
					printf("%s: not configured\n", dev);
				rv = 0;
			} else
				perror("VNIOCCLR");
		} else if (verbose)
			printf("%s: cleared\n", dev);
	}
	/*
	 * Configure the device
	 */
	if (flags & VN_CONFIG) {
		rv = ioctl(fileno(f), VNIOCSET, &vnio);
		if (rv) {
			perror("VNIOCSET");
			flags &= ~VN_ENABLE;
		} else if (verbose)
			printf("%s: %d bytes on %s\n",
			       dev, vnio.vn_size, file);
	}
	/*
	 * Enable special functions on the device
	 */
	if (flags & VN_ENABLE) {
		if (flags & VN_SWAP) {
			rv = swapon(dev);
			if (rv)
				perror("swapon");
			else if (verbose)
				printf("%s: swapping enabled\n", dev);
		}
		if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
			struct ufs_args args;
			int mflags;

			args.fspec = dev;
			mflags = (flags & VN_MOUNTRO) ? MNT_RDONLY : 0;
			rv = mount(MOUNT_UFS, oarg, mflags, &args);
			if (rv)
				perror("mount");
			else if (verbose)
				printf("%s: mounted on %s\n", dev, oarg);
		}
	}
done:
	fclose(f);
	fflush(stdout);
	return(rv < 0);
}

#define EOL(c)		((c) == '\0' || (c) == '\n')
#define WHITE(c)	((c) == ' ' || (c) == '\t' || (c) == '\n')

readconfig(flags)
	int flags;
{
	char buf[LINESIZE];
	FILE *f;
	register char *cp, *sp;
	register int ix;

	f = fopen(configfile, "r");
	if (f == NULL) {
		perror(configfile);
		exit(1);
	}
	ix = 0;
	while (fgets(buf, LINESIZE, f) != NULL) {
		cp = buf;
		if (*cp == '#')
			continue;
		while (!EOL(*cp) && WHITE(*cp))
			cp++;
		if (EOL(*cp))
			continue;
		sp = cp;
		while (!EOL(*cp) && !WHITE(*cp))
			cp++;
		if (EOL(*cp))
			continue;
		*cp++ = '\0';
		vndisks[ix].dev = malloc(cp - sp);
		strcpy(vndisks[ix].dev, sp);
		while (!EOL(*cp) && WHITE(*cp))
			cp++;
		if (EOL(*cp))
			continue;
		sp = cp;
		while (!EOL(*cp) && !WHITE(*cp))
			cp++;
		*cp++ = '\0';
		vndisks[ix].file = malloc(cp - sp);
		strcpy(vndisks[ix].file, sp);
		while (!EOL(*cp) && WHITE(*cp))
			cp++;
		vndisks[ix].flags = flags;
		if (!EOL(*cp)) {
			sp = cp;
			while (!EOL(*cp) && !WHITE(*cp))
				cp++;
			*cp++ = '\0';
			getoptions(&vndisks[ix], sp);
		}
		nvndisks++;
		ix++;
	}
}

getoptions(vnp, fstr)
	struct vndisk *vnp;
	char *fstr;
{
	int flags = 0;
	char *oarg = NULL;

	if (strcmp(fstr, "swap") == 0)
		flags |= VN_SWAP;
	else if (strncmp(fstr, "mount=", 6) == 0) {
		flags |= VN_MOUNTRW;
		oarg = &fstr[6];
	} else if (strncmp(fstr, "mountrw=", 8) == 0) {
		flags |= VN_MOUNTRW;
		oarg = &fstr[8];
	} else if (strncmp(fstr, "mountro=", 8) == 0) {
		flags |= VN_MOUNTRO;
		oarg = &fstr[8];
	} else if (strcmp(fstr, "ignore") == 0)
		flags |= VN_IGNORE;
	vnp->flags |= flags;
	if (oarg) {
		vnp->oarg = malloc(strlen(oarg) + 1);
		strcpy(vnp->oarg, oarg);
	} else
		vnp->oarg = NULL;
}

char *
rawdevice(dev)
	char *dev;
{
	register char *rawbuf, *dp, *ep;
	struct stat sb;
	int len;

	len = strlen(dev);
	rawbuf = malloc(len + 2);
	strcpy(rawbuf, dev);
	if (stat(rawbuf, &sb) != 0 || !S_ISCHR(sb.st_mode)) {
		dp = rindex(rawbuf, '/');
		if (dp) {
			for (ep = &rawbuf[len]; ep > dp; --ep)
				*(ep+1) = *ep;
			*++ep = 'r';
		}
	}
	return (rawbuf);
}

usage()
{
	fprintf(stderr, "usage: %s [-acdefuv] [special-device file]\n",
		pname);
	exit(1);
}