NetBSD/usr.bin/eject/eject.c

/*	$NetBSD: eject.c,v 1.20 2006/09/24 08:42:55 xtraeme Exp $	*/

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Chris Jones.
 *
 * 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 NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1999 The NetBSD Foundation, Inc.\n\
	All rights reserved.\n");
#endif				/* not lint */

#ifndef lint
__RCSID("$NetBSD: eject.c,v 1.20 2006/09/24 08:42:55 xtraeme Exp $");
#endif				/* not lint */

#include <sys/types.h>
#include <sys/cdio.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <sys/mtio.h>

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

struct nicknames_s {
	char *name;		/* The name given on the command line. */
	char *devname;		/* The base name of the device */
	int type;		/* The type of device, for determining what
				 * ioctl to use. */
#define TAPE 0x10
#define DISK 0x20
	/* OR one of the above with one of the below: */
#define NOTLOADABLE 0x00
#define LOADABLE 0x01
#define FLOPPY 0x2
#define TYPEMASK ((int)~0x01)
}           nicknames[] = {
	{ "diskette", "fd", DISK | FLOPPY | NOTLOADABLE },
	{ "floppy", "fd", DISK | FLOPPY | NOTLOADABLE },
	{ "fd", "fd", DISK | FLOPPY | NOTLOADABLE },
	{ "sd", "sd", DISK | NOTLOADABLE },
	{ "cdrom", "cd", DISK | LOADABLE },
	{ "cd", "cd", DISK | LOADABLE },
	{ "cdr", "cd", DISK | LOADABLE },
	{ "cdrw", "cd", DISK | LOADABLE },
	{ "dvdrom", "cd", DISK | LOADABLE },
	{ "dvd", "cd", DISK | LOADABLE },
	{ "dvdr", "cd", DISK | LOADABLE },
	{ "dvdrw", "cd", DISK | LOADABLE },
	{ "mcd", "mcd", DISK | LOADABLE },	/* XXX Is this true? */
	{ "tape", "st", TAPE | NOTLOADABLE },
	{ "st", "st", TAPE | NOTLOADABLE },
	{ "dat", "st", TAPE | NOTLOADABLE },
	{ "exabyte", "st", TAPE | NOTLOADABLE },
};
#define MAXNICKLEN 12		/* at least enough room for the longest
				 * nickname */
#define MAXDEVLEN (MAXNICKLEN + 7)	/* "/dev/r" ... "a" */

struct devtypes_s {
	char *name;
	int type;
}          devtypes[] = {
	{ "diskette", DISK | NOTLOADABLE },
	{ "floppy", DISK | NOTLOADABLE },
	{ "cdrom", DISK | LOADABLE },
	{ "disk", DISK | NOTLOADABLE },
	{ "tape", TAPE | NOTLOADABLE },
};

enum eject_op {
	OP_EJECT, OP_LOAD, OP_LOCK, OP_UNLOCK
};

int verbose_f = 0;
int umount_f = 1;

int main(int, char *[]);
void usage(void);
char *nick2dev(char *);
char *nick2rdev(char *);
int guess_devtype(char *);
char *guess_nickname(char *);
void eject_tape(char *, enum eject_op);
void eject_disk(char *, enum eject_op);
void unmount_dev(char *);

int
main(int argc, char *argv[])
{
	int ch;
	int devtype = -1;
	int n, i;
	char *devname = NULL;
	enum eject_op op = OP_EJECT;

	while ((ch = getopt(argc, argv, "d:flLnt:Uv")) != -1) {
		switch (ch) {
		case 'd':
			devname = optarg;
			break;
		case 'f':
			umount_f = 0;
			break;
		case 'l':
			if (op != OP_EJECT)
				usage();
			op = OP_LOAD;
			break;
		case 'L':
			if (op != OP_EJECT)
				usage();
			op = OP_LOCK;
			break;
		case 'n':
			for (n = 0; n < sizeof(nicknames) / sizeof(nicknames[0]);
			    n++) {
				struct nicknames_s *np = &nicknames[n];

				printf("%s -> %s\n", np->name, nick2dev(np->name));
			}
			return (0);
		case 't':
			for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]);
			    i++) {
				if (strcasecmp(devtypes[i].name, optarg) == 0) {
					devtype = devtypes[i].type;
					break;
				}
			}
			if (devtype == -1)
				errx(1, "%s: unknown device type", optarg);
			break;
		case 'U':
			if (op != OP_EJECT)
				usage();
			op = OP_UNLOCK;
			break;
		case 'v':
			verbose_f = 1;
			break;
		default:
			usage();
			/* NOTREACHED */
		}
	}
	argc -= optind;
	argv += optind;

	if (devname == NULL) {
		if (argc == 0) {
			usage();
			/* NOTREACHED */
		} else
			devname = argv[0];
	}
	if (devtype == -1)
		devtype = guess_devtype(devname);
	if (devtype == -1)
		errx(1, "%s: unable to determine type of device",
		    devname);
	if (verbose_f) {
		printf("device type == ");
		if ((devtype & TYPEMASK) == TAPE)
			printf("tape\n");
		else
			printf("disk, floppy, or cdrom\n");
	}
	if (umount_f)
		unmount_dev(devname);

	/* XXX Tapes and disks have different ioctl's: */
	if ((devtype & TYPEMASK) == TAPE)
		eject_tape(devname, op);
	else
		eject_disk(devname, op);

	if (verbose_f)
		printf("done.\n");

	return (0);
}

void
usage(void)
{

	fprintf(stderr, "usage: eject [-fv] [-l | -L | -U] "
	    "[-t device-type] [-d] device\n");
	fprintf(stderr, "       eject -n\n");
	exit(1);
}

int
guess_devtype(char *devname)
{
	int n;

	/* Nickname match: */
	for (n = 0; n < sizeof(nicknames) / sizeof(nicknames[0]);
	    n++) {
		if (strncasecmp(nicknames[n].name, devname,
			strlen(nicknames[n].name)) == 0)
			return (nicknames[n].type);
	}

	/*
         * If we still don't know it, then try to compare vs. dev
         * and rdev names that we know.
         */
	/* dev first: */
	for (n = 0; n < sizeof(nicknames) / sizeof(nicknames[0]); n++) {
		char *name;
		name = nick2dev(nicknames[n].name);
		/*
		 * Assume that the part of the name that distinguishes the
		 * instance of this device begins with a 0.
		 */
		*(strchr(name, '0')) = '\0';
		if (strncmp(name, devname, strlen(name)) == 0)
			return (nicknames[n].type);
	}

	/* Now rdev: */
	for (n = 0; n < sizeof(nicknames) / sizeof(nicknames[0]); n++) {
		char *name = nick2rdev(nicknames[n].name);
		*(strchr(name, '0')) = '\0';
		if (strncmp(name, devname, strlen(name)) == 0)
			return (nicknames[n].type);
	}

	/* Not found. */
	return (-1);
}
/* "floppy5" -> "/dev/fd5a".  Yep, this uses a static buffer. */
char *
nick2dev(char *nn)
{
	int n;
	static char devname[MAXDEVLEN];
	int devnum = 0;

	for (n = 0; n < sizeof(nicknames) / sizeof(nicknames[0]); n++) {
		if (strncasecmp(nicknames[n].name, nn,
			strlen(nicknames[n].name)) == 0) {
			sscanf(nn, "%*[^0-9]%d", &devnum);
			sprintf(devname, "/dev/%s%d", nicknames[n].devname,
			    devnum);
			if ((nicknames[n].type & TYPEMASK) != TAPE)
				strcat(devname, "a");
			return (devname);
		}
	}

	return (NULL);
}
/* "floppy5" -> "/dev/rfd5c".  Static buffer. */
char *
nick2rdev(char *nn)
{
	int n;
	static char devname[MAXDEVLEN];
	int devnum = 0;

	for (n = 0; n < sizeof(nicknames) / sizeof(nicknames[0]); n++) {
		if (strncasecmp(nicknames[n].name, nn,
			strlen(nicknames[n].name)) == 0) {
			sscanf(nn, "%*[^0-9]%d", &devnum);
			sprintf(devname, "/dev/r%s%d", nicknames[n].devname,
			    devnum);
			if ((nicknames[n].type & TYPEMASK) != TAPE) {
				strcat(devname, "a");
				if ((nicknames[n].type & FLOPPY) != FLOPPY)
					devname[strlen(devname) - 1] += getrawpartition();
			}
			return (devname);
		}
	}

	return (NULL);
}
/* Unmount all filesystems attached to dev. */
void
unmount_dev(char *name)
{
	struct statvfs *mounts;
	int i, nmnts, len;
	char *dn;

	nmnts = getmntinfo(&mounts, MNT_NOWAIT);
	if (nmnts == 0) {
		err(1, "getmntinfo");
	}
	/* Make sure we have a device name: */
	dn = nick2dev(name);
	if (dn == NULL)
		dn = name;

	/* Set len to strip off the partition name: */
	len = strlen(dn);
	if (!isdigit((unsigned char)dn[len - 1]))
		len--;
	if (!isdigit((unsigned char)dn[len - 1])) {
		errx(1, "Can't figure out base name for dev name %s", dn);
	}
	for (i = 0; i < nmnts; i++) {
		if (strncmp(mounts[i].f_mntfromname, dn, len) == 0) {
			if (verbose_f)
				printf("Unmounting %s from %s...\n",
				    mounts[i].f_mntfromname,
				    mounts[i].f_mntonname);

			if (unmount(mounts[i].f_mntonname, 0) == -1) {
				err(1, "unmount: %s", mounts[i].f_mntonname);
			}
		}
	}

	return;
}

void
eject_tape(char *name, enum eject_op op)
{
	struct mtop m;
	int fd;
	char *dn;

	dn = nick2rdev(name);
	if (dn == NULL)
		dn = name;	/* Hope for the best. */
	fd = open(dn, O_RDONLY);
	if (fd == -1)
		err(1, "open: %s", dn);
	switch (op) {
	case OP_EJECT:
		if (verbose_f)
			printf("Ejecting %s...\n", dn);

		m.mt_op = MTOFFL;
		m.mt_count = 0;
		if (ioctl(fd, MTIOCTOP, &m) == -1)
			err(1, "ioctl: MTIOCTOP: %s", dn);
		break;
	case OP_LOAD:
		errx(1, "cannot load tapes");
		/* NOTREACHED */
	case OP_LOCK:
		errx(1, "cannot lock tapes");
		/* NOTREACHED */
	case OP_UNLOCK:
		errx(1, "cannot unlock tapes");
		/* NOTREACHED */
	}
	close(fd);
	return;
}

void
eject_disk(char *name, enum eject_op op)
{
	int fd;
	char *dn;
	int arg;

	dn = nick2rdev(name);
	if (dn == NULL)
		dn = name;	/* Hope for the best. */
	fd = open(dn, O_RDONLY);
	if (fd == -1)
		err(1, "open: %s", dn);
	switch (op) {
	case OP_LOAD:
		if (verbose_f)
			printf("Closing %s...\n", dn);

		if (ioctl(fd, CDIOCCLOSE, NULL) == -1)
			err(1, "ioctl: CDIOCCLOSE: %s", dn);
		break;
	case OP_EJECT:
		if (verbose_f)
			printf("Ejecting %s...\n", dn);

		arg = 0;
		if (umount_f == 0) {
			/* force eject, unlock the device first */
			if (ioctl(fd, DIOCLOCK, &arg) == -1)
				err(1, "ioctl: DIOCLOCK: %s", dn);
			arg = 1;
		}
		if (ioctl(fd, DIOCEJECT, &arg) == -1)
			err(1, "ioctl: DIOCEJECT: %s", dn);
		break;
	case OP_LOCK:
		if (verbose_f)
			printf("Locking %s...\n", dn);

		arg = 1;
		if (ioctl(fd, DIOCLOCK, &arg) == -1)
			err(1, "ioctl: DIOCLOCK: %s", dn);
		break;
	case OP_UNLOCK:
		if (verbose_f)
			printf("Unlocking %s...\n", dn);

		arg = 0;
		if (ioctl(fd, DIOCLOCK, &arg) == -1)
			err(1, "ioctl: DIOCLOCK: %s", dn);
		break;
	}

	close(fd);
	return;
}