1/*	$NetBSD: rmt.c,v 1.9 1997/10/17 13:03:25 lukem Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n");
40#endif /* not lint */
41
42#ifndef lint
43#if 0
44static char sccsid[] = "@(#)rmt.c	8.1 (Berkeley) 6/6/93";
45#else
46__RCSID("$NetBSD: rmt.c,v 1.9 1997/10/17 13:03:25 lukem Exp $");
47#endif
48#endif /* not lint */
49
50/*
51 * rmt
52 */
53#include <sys/types.h>
54#include <sys/ioctl.h>
55#include <sys/mtio.h>
56#include <sys/socket.h>
57#include <sys/stat.h>
58
59#include <errno.h>
60#include <fcntl.h>
61#include <stdio.h>
62#include <stdlib.h>
63#include <string.h>
64#include <unistd.h>
65
66int	tape = -1;
67
68char	*record;
69int	maxrecsize = -1;
70
71#define	SSIZE	64
72char	device[SSIZE];
73char	count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
74
75char	resp[BUFSIZ];
76
77FILE	*debug;
78#define	DEBUG(f)	if (debug) fprintf(debug, f)
79#define	DEBUG1(f,a)	if (debug) fprintf(debug, f, a)
80#define	DEBUG2(f,a1,a2)	if (debug) fprintf(debug, f, a1, a2)
81
82char	*checkbuf __P((char *, int));
83void	 error __P((int));
84int	 main __P((int, char **));
85void	 getstring __P((char *));
86
87int
88main(argc, argv)
89	int argc;
90	char **argv;
91{
92	int rval;
93	char c;
94	int n, i, cc;
95
96	argc--, argv++;
97	if (argc > 0) {
98		debug = fopen(*argv, "w");
99		if (debug == 0)
100			exit(1);
101		(void)setbuf(debug, (char *)0);
102	}
103top:
104	errno = 0;
105	rval = 0;
106	if (read(STDIN_FILENO, &c, 1) != 1)
107		exit(0);
108	switch (c) {
109
110	case 'O':
111		if (tape >= 0)
112			(void) close(tape);
113		getstring(device);
114		getstring(mode);
115		DEBUG2("rmtd: O %s %s\n", device, mode);
116		tape = open(device, atoi(mode),
117		    S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
118		if (tape < 0)
119			goto ioerror;
120		goto respond;
121
122	case 'C':
123		DEBUG("rmtd: C\n");
124		getstring(device);		/* discard */
125		if (close(tape) < 0)
126			goto ioerror;
127		tape = -1;
128		goto respond;
129
130	case 'L':
131		getstring(count);
132		getstring(pos);
133		DEBUG2("rmtd: L %s %s\n", count, pos);
134		rval = lseek(tape, (off_t)strtoq(count, NULL, 10), atoi(pos));
135		if (rval < 0)
136			goto ioerror;
137		goto respond;
138
139	case 'W':
140		getstring(count);
141		n = atoi(count);
142		DEBUG1("rmtd: W %s\n", count);
143		record = checkbuf(record, n);
144		for (i = 0; i < n; i += cc) {
145			cc = read(STDIN_FILENO, &record[i], n - i);
146			if (cc <= 0) {
147				DEBUG("rmtd: premature eof\n");
148				exit(2);
149			}
150		}
151		rval = write(tape, record, n);
152		if (rval < 0)
153			goto ioerror;
154		goto respond;
155
156	case 'R':
157		getstring(count);
158		DEBUG1("rmtd: R %s\n", count);
159		n = atoi(count);
160		record = checkbuf(record, n);
161		rval = read(tape, record, n);
162		if (rval < 0)
163			goto ioerror;
164		(void)sprintf(resp, "A%d\n", rval);
165		(void)write(STDOUT_FILENO, resp, strlen(resp));
166		(void)write(STDOUT_FILENO, record, rval);
167		goto top;
168
169	case 'I':
170		getstring(op);
171		getstring(count);
172		DEBUG2("rmtd: I %s %s\n", op, count);
173		{
174			struct mtop mtop;
175
176			mtop.mt_op = atoi(op);
177			mtop.mt_count = atoi(count);
178			if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
179				goto ioerror;
180			rval = mtop.mt_count;
181		}
182		goto respond;
183
184	case 'S':		/* status */
185		DEBUG("rmtd: S\n");
186		{
187			struct mtget mtget;
188
189			if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
190				goto ioerror;
191			rval = sizeof (mtget);
192			(void)sprintf(resp, "A%d\n", rval);
193			(void)write(STDOUT_FILENO, resp, strlen(resp));
194			(void)write(STDOUT_FILENO, (char *)&mtget,
195			    sizeof (mtget));
196			goto top;
197		}
198
199	default:
200		DEBUG1("rmtd: garbage command %c\n", c);
201		exit(3);
202	}
203respond:
204	DEBUG1("rmtd: A %d\n", rval);
205	(void)sprintf(resp, "A%d\n", rval);
206	(void)write(STDOUT_FILENO, resp, strlen(resp));
207	goto top;
208ioerror:
209	error(errno);
210	goto top;
211}
212
213void
214getstring(bp)
215	char *bp;
216{
217	int i;
218	char *cp = bp;
219
220	for (i = 0; i < SSIZE - 1; i++) {
221		if (read(STDIN_FILENO, cp+i, 1) != 1)
222			exit(0);
223		if (cp[i] == '\n')
224			break;
225	}
226	cp[i] = '\0';
227}
228
229char *
230checkbuf(record, size)
231	char *record;
232	int size;
233{
234
235	if (size <= maxrecsize)
236		return (record);
237	if (record != 0)
238		free(record);
239	record = malloc(size);
240	if (record == 0) {
241		DEBUG("rmtd: cannot allocate buffer space\n");
242		exit(4);
243	}
244	maxrecsize = size;
245	while (size > 1024 &&
246	    setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
247		size -= 1024;
248	return (record);
249}
250
251void
252error(num)
253	int num;
254{
255
256	DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
257	(void)sprintf(resp, "E%d\n%s\n", num, strerror(num));
258	(void)write(STDOUT_FILENO, resp, strlen(resp));
259}
260