[dump.git] / rmt / rmt.c

/*
 *	Ported to Linux's Second Extended File System as part of the
 *	dump and restore backup suit
 *	Remy Card <card@Linux.EU.Org>, 1994-1997
 *      Stelian Pop <pop@cybercable.fr>, 1999 
 *
 */

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)rmt.c	8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
	"$Id: rmt.c,v 1.2 1999/10/11 12:53:25 stelian Exp $";
#endif /* not lint */

/*
 * rmt
 */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/mtio.h>
#include <errno.h>
#include <fcntl.h>
#include <sgtty.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int	tape = -1;

char	*record;
int	maxrecsize = -1;

#define	SSIZE	64
char	device[SSIZE];
char	count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];

char	resp[BUFSIZ];

FILE	*debug;
#define	DEBUG(f)	if (debug) fprintf(debug, f)
#define	DEBUG1(f,a)	if (debug) fprintf(debug, f, a)
#define	DEBUG2(f,a1,a2)	if (debug) fprintf(debug, f, a1, a2)

char	*checkbuf __P((char *, int));
void	 error __P((int));
void	 getstring __P((char *));

int
main(argc, argv)
	int argc;
	char **argv;
{
	int rval;
	char c;
	int n, i, cc;

	argc--, argv++;
	if (argc > 0) {
		debug = fopen(*argv, "w");
		if (debug == 0)
			exit(1);
		(void)setbuf(debug, (char *)0);
	}
top:
	errno = 0;
	rval = 0;
	if (read(0, &c, 1) != 1)
		exit(0);
	switch (c) {

	case 'O':
		if (tape >= 0)
			(void) close(tape);
		getstring(device);
		getstring(mode);
		DEBUG2("rmtd: O %s %s\n", device, mode);
		/*
		 * XXX the rmt protocol does not provide a means to
		 * specify the permission bits; allow rw for everyone,
		 * as modified by the users umask
		 */
		tape = open(device, atoi(mode), 0666);
		if (tape < 0)
			goto ioerror;
		goto respond;

	case 'C':
		DEBUG("rmtd: C\n");
		getstring(device);		/* discard */
		if (close(tape) < 0)
			goto ioerror;
		tape = -1;
		goto respond;

	case 'L':
		getstring(count);
		getstring(pos);
		DEBUG2("rmtd: L %s %s\n", count, pos);
		rval = lseek(tape, (off_t)atol(count), atoi(pos));
		if (rval < 0)
			goto ioerror;
		goto respond;

	case 'W':
		getstring(count);
		n = atoi(count);
		DEBUG1("rmtd: W %s\n", count);
		record = checkbuf(record, n);
		for (i = 0; i < n; i += cc) {
			cc = read(0, &record[i], n - i);
			if (cc <= 0) {
				DEBUG("rmtd: premature eof\n");
				exit(2);
			}
		}
		rval = write(tape, record, n);
		if (rval < 0)
			goto ioerror;
		goto respond;

	case 'R':
		getstring(count);
		DEBUG1("rmtd: R %s\n", count);
		n = atoi(count);
		record = checkbuf(record, n);
		rval = read(tape, record, n);
		if (rval < 0)
			goto ioerror;
		(void)sprintf(resp, "A%d\n", rval);
		(void)write(1, resp, strlen(resp));
		(void)write(1, record, rval);
		goto top;

	case 'I':
		getstring(op);
		getstring(count);
		DEBUG2("rmtd: I %s %s\n", op, count);
		{ struct mtop mtop;
		  mtop.mt_op = atoi(op);
		  mtop.mt_count = atoi(count);
		  if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
			goto ioerror;
		  rval = mtop.mt_count;
		}
		goto respond;

	case 'S':		/* status */
		DEBUG("rmtd: S\n");
		{ struct mtget mtget;
		  if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
			goto ioerror;
		  rval = sizeof (mtget);
		  (void)sprintf(resp, "A%d\n", rval);
		  (void)write(1, resp, strlen(resp));
		  (void)write(1, (char *)&mtget, sizeof (mtget));
		  goto top;
		}

        case 'V':               /* version */
                getstring(op);
                DEBUG1("rmtd: V %s\n", op);
                rval = 2;
                goto respond;

	default:
		DEBUG1("rmtd: garbage command %c\n", c);
		exit(3);
	}
respond:
	DEBUG1("rmtd: A %d\n", rval);
	(void)sprintf(resp, "A%d\n", rval);
	(void)write(1, resp, strlen(resp));
	goto top;
ioerror:
	error(errno);
	goto top;
}

void
getstring(bp)
	char *bp;
{
	int i;
	char *cp = bp;

	for (i = 0; i < SSIZE; i++) {
		if (read(0, cp+i, 1) != 1)
			exit(0);
		if (cp[i] == '\n')
			break;
	}
	cp[i] = '\0';
}

char *
checkbuf(record, size)
	char *record;
	int size;
{

	if (size <= maxrecsize)
		return (record);
	if (record != 0)
		free(record);
	record = malloc(size);
	if (record == 0) {
		DEBUG("rmtd: cannot allocate buffer space\n");
		exit(4);
	}
	maxrecsize = size;
	while (size > 1024 &&
	       setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
		size -= 1024;
	return (record);
}

void
error(num)
	int num;
{

	DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
	(void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
	(void)write(1, resp, strlen(resp));
}
Commit	Line	Data
1227625a SP	1	/*
	2	* Ported to Linux's Second Extended File System as part of the
	3	* dump and restore backup suit
b45f51d6 SP	4	* Remy Card <card@Linux.EU.Org>, 1994-1997
b45f51d6 SP	5	* Stelian Pop <pop@cybercable.fr>, 1999
1227625a SP	6	*
	7	*/
	8
	9	/*
	10	* Copyright (c) 1983, 1993
	11	* The Regents of the University of California. All rights reserved.
	12	*
	13	* Redistribution and use in source and binary forms, with or without
	14	* modification, are permitted provided that the following conditions
	15	* are met:
	16	* 1. Redistributions of source code must retain the above copyright
	17	* notice, this list of conditions and the following disclaimer.
	18	* 2. Redistributions in binary form must reproduce the above copyright
	19	* notice, this list of conditions and the following disclaimer in the
	20	* documentation and/or other materials provided with the distribution.
	21	* 3. All advertising materials mentioning features or use of this software
	22	* must display the following acknowledgement:
	23	* This product includes software developed by the University of
	24	* California, Berkeley and its contributors.
	25	* 4. Neither the name of the University nor the names of its contributors
	26	* may be used to endorse or promote products derived from this software
	27	* without specific prior written permission.
	28	*
	29	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	30	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	31	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	32	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	33	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	34	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	35	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	36	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	37	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	38	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	39	* SUCH DAMAGE.
	40	*/
	41
	42	#ifndef lint
b45f51d6	43	static const char copyright[] =
1227625a SP	44	"@(#) Copyright (c) 1983, 1993\n\
	45	The Regents of the University of California. All rights reserved.\n";
	46	#endif /* not lint */
	47
	48	#ifndef lint
b45f51d6	49	#if 0
1227625a	50	static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93";
b45f51d6 SP	51	#endif
	52	static const char rcsid[] =
	53	"$Id: rmt.c,v 1.2 1999/10/11 12:53:25 stelian Exp $";
1227625a SP	54	#endif /* not lint */
	55
	56	/*
	57	* rmt
	58	*/
	59	#include <sys/types.h>
	60	#include <sys/socket.h>
	61	#include <sys/mtio.h>
	62	#include <errno.h>
	63	#include <fcntl.h>
	64	#include <sgtty.h>
	65	#include <stdio.h>
	66	#include <stdlib.h>
	67	#include <string.h>
	68	#include <unistd.h>
	69
	70	int tape = -1;
	71
	72	char *record;
	73	int maxrecsize = -1;
	74
	75	#define SSIZE 64
	76	char device[SSIZE];
	77	char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
	78
	79	char resp[BUFSIZ];
	80
	81	FILE *debug;
	82	#define DEBUG(f) if (debug) fprintf(debug, f)
	83	#define DEBUG1(f,a) if (debug) fprintf(debug, f, a)
	84	#define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
	85
	86	char checkbuf __P((char , int));
	87	void error __P((int));
	88	void getstring __P((char *));
	89
	90	int
	91	main(argc, argv)
	92	int argc;
	93	char **argv;
	94	{
	95	int rval;
	96	char c;
	97	int n, i, cc;
	98
	99	argc--, argv++;
	100	if (argc > 0) {
	101	debug = fopen(*argv, "w");
	102	if (debug == 0)
	103	exit(1);
	104	(void)setbuf(debug, (char *)0);
	105	}
	106	top:
	107	errno = 0;
	108	rval = 0;
	109	if (read(0, &c, 1) != 1)
	110	exit(0);
	111	switch (c) {
	112
	113	case 'O':
	114	if (tape >= 0)
	115	(void) close(tape);
	116	getstring(device);
	117	getstring(mode);
118	DEBUG2("rmtd: O %s %s\n", device, mode);
b45f51d6 SP	119	/*
	120	* XXX the rmt protocol does not provide a means to
	121	* specify the permission bits; allow rw for everyone,
	122	* as modified by the users umask
	123	*/
	124	tape = open(device, atoi(mode), 0666);
1227625a SP	125	if (tape < 0)
	126	goto ioerror;
	127	goto respond;
	128
	129	case 'C':
	130	DEBUG("rmtd: C\n");
	131	getstring(device); /* discard */
	132	if (close(tape) < 0)
	133	goto ioerror;
	134	tape = -1;
	135	goto respond;
	136
	137	case 'L':
	138	getstring(count);
	139	getstring(pos);
	140	DEBUG2("rmtd: L %s %s\n", count, pos);
	141	rval = lseek(tape, (off_t)atol(count), atoi(pos));
	142	if (rval < 0)
	143	goto ioerror;
	144	goto respond;
	145
	146	case 'W':
	147	getstring(count);
	148	n = atoi(count);
	149	DEBUG1("rmtd: W %s\n", count);
	150	record = checkbuf(record, n);
	151	for (i = 0; i < n; i += cc) {
	152	cc = read(0, &record[i], n - i);
	153	if (cc <= 0) {
	154	DEBUG("rmtd: premature eof\n");
	155	exit(2);
	156	}
	157	}
	158	rval = write(tape, record, n);
	159	if (rval < 0)
	160	goto ioerror;
	161	goto respond;
	162
	163	case 'R':
	164	getstring(count);
	165	DEBUG1("rmtd: R %s\n", count);
	166	n = atoi(count);
	167	record = checkbuf(record, n);
	168	rval = read(tape, record, n);
	169	if (rval < 0)
	170	goto ioerror;
	171	(void)sprintf(resp, "A%d\n", rval);
	172	(void)write(1, resp, strlen(resp));
	173	(void)write(1, record, rval);
	174	goto top;
	175
	176	case 'I':
	177	getstring(op);
	178	getstring(count);
	179	DEBUG2("rmtd: I %s %s\n", op, count);
	180	{ struct mtop mtop;
	181	mtop.mt_op = atoi(op);
	182	mtop.mt_count = atoi(count);
	183	if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
	184	goto ioerror;
	185	rval = mtop.mt_count;
	186	}
	187	goto respond;
	188
189	case 'S': /* status */
190	DEBUG("rmtd: S\n");
191	{ struct mtget mtget;
192	if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
193	goto ioerror;
194	rval = sizeof (mtget);
195	(void)sprintf(resp, "A%d\n", rval);
196	(void)write(1, resp, strlen(resp));
197	(void)write(1, (char *)&mtget, sizeof (mtget));
198	goto top;
199	}
200
b45f51d6 SP	201	case 'V': /* version */
	202	getstring(op);
	203	DEBUG1("rmtd: V %s\n", op);
	204	rval = 2;
	205	goto respond;
	206
1227625a SP	207	default:
	208	DEBUG1("rmtd: garbage command %c\n", c);
	209	exit(3);
	210	}
	211	respond:
	212	DEBUG1("rmtd: A %d\n", rval);
	213	(void)sprintf(resp, "A%d\n", rval);
	214	(void)write(1, resp, strlen(resp));
	215	goto top;
	216	ioerror:
	217	error(errno);
	218	goto top;
	219	}
	220
	221	void
	222	getstring(bp)
	223	char *bp;
	224	{
	225	int i;
	226	char *cp = bp;
	227
	228	for (i = 0; i < SSIZE; i++) {
	229	if (read(0, cp+i, 1) != 1)
	230	exit(0);
	231	if (cp[i] == '\n')
	232	break;
	233	}
	234	cp[i] = '\0';
	235	}
	236
	237	char *
	238	checkbuf(record, size)
	239	char *record;
	240	int size;
	241	{
	242
	243	if (size <= maxrecsize)
	244	return (record);
	245	if (record != 0)
	246	free(record);
	247	record = malloc(size);
	248	if (record == 0) {
	249	DEBUG("rmtd: cannot allocate buffer space\n");
	250	exit(4);
	251	}
	252	maxrecsize = size;
	253	while (size > 1024 &&
	254	setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
	255	size -= 1024;
	256	return (record);
	257	}
	258
	259	void
	260	error(num)
	261	int num;
	262	{
	263
	264	DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
b45f51d6	265	(void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
1227625a SP	266	(void)write(1, resp, strlen(resp));
1227625a SP	267	}