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