xref: /freebsd/usr.sbin/rmt/rmt.c (revision 13014ca04aad1931d41958b56f71a2c65b9a7a2c)
1 /*
2  * Copyright (c) 1983, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #if 0
31 #ifndef lint
32 static const char copyright[] =
33 "@(#) Copyright (c) 1983, 1993\n\
34 	The Regents of the University of California.  All rights reserved.\n";
35 #endif /* not lint */
36 
37 #ifndef lint
38 static char sccsid[] = "@(#)rmt.c	8.1 (Berkeley) 6/6/93";
39 #endif /* not lint */
40 #endif
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43 
44 /*
45  * rmt
46  */
47 #include <sys/types.h>
48 #include <sys/socket.h>
49 #include <sys/mtio.h>
50 #include <errno.h>
51 #include <fcntl.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <unistd.h>
56 
57 int	tape = -1;
58 
59 char	*record;
60 int	maxrecsize = -1;
61 
62 #define	SSIZE	64
63 char	device[SSIZE];
64 char	count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
65 
66 char	resp[BUFSIZ];
67 
68 FILE	*debug;
69 #define	DEBUG(f)	if (debug) fprintf(debug, f)
70 #define	DEBUG1(f,a)	if (debug) fprintf(debug, f, a)
71 #define	DEBUG2(f,a1,a2)	if (debug) fprintf(debug, f, a1, a2)
72 
73 char	*checkbuf(char *, int);
74 void	 error(int);
75 void	 getstring(char *);
76 
77 int
78 main(int argc, char **argv)
79 {
80 	int rval;
81 	char c;
82 	int n, i, cc;
83 
84 	argc--, argv++;
85 	if (argc > 0) {
86 		debug = fopen(*argv, "w");
87 		if (debug == 0)
88 			exit(1);
89 		(void)setbuf(debug, (char *)0);
90 	}
91 top:
92 	errno = 0;
93 	rval = 0;
94 	if (read(STDIN_FILENO, &c, 1) != 1)
95 		exit(0);
96 	switch (c) {
97 
98 	case 'O':
99 		if (tape >= 0)
100 			(void) close(tape);
101 		getstring(device);
102 		getstring(mode);
103 		DEBUG2("rmtd: O %s %s\n", device, mode);
104 		/*
105 		 * XXX the rmt protocol does not provide a means to
106 		 * specify the permission bits; allow rw for everyone,
107 		 * as modified by the users umask
108 		 */
109 		tape = open(device, atoi(mode), 0666);
110 		if (tape < 0)
111 			goto ioerror;
112 		goto respond;
113 
114 	case 'C':
115 		DEBUG("rmtd: C\n");
116 		getstring(device);		/* discard */
117 		if (close(tape) < 0)
118 			goto ioerror;
119 		tape = -1;
120 		goto respond;
121 
122 	case 'L':
123 		getstring(count);
124 		getstring(pos);
125 		DEBUG2("rmtd: L %s %s\n", count, pos);
126 		rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos));
127 		if (rval < 0)
128 			goto ioerror;
129 		goto respond;
130 
131 	case 'W':
132 		getstring(count);
133 		n = atoi(count);
134 		DEBUG1("rmtd: W %s\n", count);
135 		record = checkbuf(record, n);
136 		for (i = 0; i < n; i += cc) {
137 			cc = read(STDIN_FILENO, &record[i], n - i);
138 			if (cc <= 0) {
139 				DEBUG("rmtd: premature eof\n");
140 				exit(2);
141 			}
142 		}
143 		rval = write(tape, record, n);
144 		if (rval < 0)
145 			goto ioerror;
146 		goto respond;
147 
148 	case 'R':
149 		getstring(count);
150 		DEBUG1("rmtd: R %s\n", count);
151 		n = atoi(count);
152 		record = checkbuf(record, n);
153 		rval = read(tape, record, n);
154 		if (rval < 0)
155 			goto ioerror;
156 		(void)sprintf(resp, "A%d\n", rval);
157 		(void)write(STDOUT_FILENO, resp, strlen(resp));
158 		(void)write(STDOUT_FILENO, record, rval);
159 		goto top;
160 
161 	case 'I':
162 		getstring(op);
163 		getstring(count);
164 		DEBUG2("rmtd: I %s %s\n", op, count);
165 		{ struct mtop mtop;
166 		  mtop.mt_op = atoi(op);
167 		  mtop.mt_count = atoi(count);
168 		  if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
169 			goto ioerror;
170 		  rval = mtop.mt_count;
171 		}
172 		goto respond;
173 
174 	case 'S':		/* status */
175 		DEBUG("rmtd: S\n");
176 		{ struct mtget mtget;
177 		  if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
178 			goto ioerror;
179 		  rval = sizeof (mtget);
180 		  if (rval > 24)	/* original mtget structure size */
181 			rval = 24;
182 		  (void)sprintf(resp, "A%d\n", rval);
183 		  (void)write(STDOUT_FILENO, resp, strlen(resp));
184 		  (void)write(STDOUT_FILENO, (char *)&mtget, rval);
185 		  goto top;
186 		}
187 
188         case 'V':               /* version */
189                 getstring(op);
190                 DEBUG1("rmtd: V %s\n", op);
191                 rval = 2;
192                 goto respond;
193 
194 	default:
195 		DEBUG1("rmtd: garbage command %c\n", c);
196 		exit(3);
197 	}
198 respond:
199 	DEBUG1("rmtd: A %d\n", rval);
200 	(void)sprintf(resp, "A%d\n", rval);
201 	(void)write(STDOUT_FILENO, resp, strlen(resp));
202 	goto top;
203 ioerror:
204 	error(errno);
205 	goto top;
206 }
207 
208 void
209 getstring(bp)
210 	char *bp;
211 {
212 	int i;
213 	char *cp = bp;
214 
215 	for (i = 0; i < SSIZE; i++) {
216 		if (read(STDIN_FILENO, cp+i, 1) != 1)
217 			exit(0);
218 		if (cp[i] == '\n')
219 			break;
220 	}
221 	cp[i] = '\0';
222 }
223 
224 char *
225 checkbuf(rec, size)
226 	char *rec;
227 	int size;
228 {
229 
230 	if (size <= maxrecsize)
231 		return (rec);
232 	if (rec != 0)
233 		free(rec);
234 	rec = malloc(size);
235 	if (rec == 0) {
236 		DEBUG("rmtd: cannot allocate buffer space\n");
237 		exit(4);
238 	}
239 	maxrecsize = size;
240 	while (size > 1024 &&
241 	       setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
242 		size -= 1024;
243 	return (rec);
244 }
245 
246 void
247 error(num)
248 	int num;
249 {
250 
251 	DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
252 	(void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
253 	(void)write(STDOUT_FILENO, resp, strlen(resp));
254 }
255