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 /*
33 * rmt
34 */
35 #include <sys/types.h>
36 #include <sys/socket.h>
37 #include <sys/mtio.h>
38 #include <errno.h>
39 #include <fcntl.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 static int tape = -1;
46
47 static char *record;
48 static int maxrecsize = -1;
49
50 #define SSIZE 64
51 static char device[SSIZE];
52 static char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
53
54 static char resp[BUFSIZ];
55
56 static FILE *debug;
57 #define DEBUG(f) if (debug) fprintf(debug, f)
58 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a)
59 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
60
61 static char *checkbuf(char *, int);
62 static void error(int);
63 static void getstring(char *);
64
65 int
main(int argc,char ** argv)66 main(int argc, char **argv)
67 {
68 int rval;
69 char c;
70 int n, i, cc;
71
72 argc--, argv++;
73 if (argc > 0) {
74 debug = fopen(*argv, "w");
75 if (debug == NULL) {
76 DEBUG1("rmtd: error to open %s\n", *argv);
77 exit(1);
78 }
79 (void)setbuf(debug, (char *)0);
80 }
81 top:
82 errno = 0;
83 rval = 0;
84 if (read(STDIN_FILENO, &c, 1) != 1)
85 exit(0);
86 switch (c) {
87
88 case 'O':
89 if (tape >= 0)
90 (void) close(tape);
91 getstring(device);
92 getstring(mode);
93 DEBUG2("rmtd: O %s %s\n", device, mode);
94 /*
95 * XXX the rmt protocol does not provide a means to
96 * specify the permission bits; allow rw for everyone,
97 * as modified by the users umask
98 */
99 tape = open(device, atoi(mode), 0666);
100 if (tape < 0)
101 goto ioerror;
102 goto respond;
103
104 case 'C':
105 DEBUG("rmtd: C\n");
106 getstring(device); /* discard */
107 if (close(tape) < 0)
108 goto ioerror;
109 tape = -1;
110 goto respond;
111
112 case 'L':
113 getstring(count);
114 getstring(pos);
115 DEBUG2("rmtd: L %s %s\n", count, pos);
116 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos));
117 if (rval < 0)
118 goto ioerror;
119 goto respond;
120
121 case 'W':
122 getstring(count);
123 n = atoi(count);
124 DEBUG1("rmtd: W %s\n", count);
125 record = checkbuf(record, n);
126 for (i = 0; i < n; i += cc) {
127 cc = read(STDIN_FILENO, &record[i], n - i);
128 if (cc <= 0) {
129 DEBUG("rmtd: premature eof\n");
130 exit(2);
131 }
132 }
133 rval = write(tape, record, n);
134 if (rval < 0)
135 goto ioerror;
136 goto respond;
137
138 case 'R':
139 getstring(count);
140 DEBUG1("rmtd: R %s\n", count);
141 n = atoi(count);
142 record = checkbuf(record, n);
143 rval = read(tape, record, n);
144 if (rval < 0)
145 goto ioerror;
146 (void)sprintf(resp, "A%d\n", rval);
147 (void)write(STDOUT_FILENO, resp, strlen(resp));
148 (void)write(STDOUT_FILENO, record, rval);
149 goto top;
150
151 case 'I':
152 getstring(op);
153 getstring(count);
154 DEBUG2("rmtd: I %s %s\n", op, count);
155 { struct mtop mtop;
156 mtop.mt_op = atoi(op);
157 mtop.mt_count = atoi(count);
158 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
159 goto ioerror;
160 rval = mtop.mt_count;
161 }
162 goto respond;
163
164 case 'S': /* status */
165 DEBUG("rmtd: S\n");
166 { struct mtget mtget;
167 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
168 goto ioerror;
169 rval = sizeof (mtget);
170 if (rval > 24) /* original mtget structure size */
171 rval = 24;
172 (void)sprintf(resp, "A%d\n", rval);
173 (void)write(STDOUT_FILENO, resp, strlen(resp));
174 (void)write(STDOUT_FILENO, (char *)&mtget, rval);
175 goto top;
176 }
177
178 case 'V': /* version */
179 getstring(op);
180 DEBUG1("rmtd: V %s\n", op);
181 rval = 2;
182 goto respond;
183
184 default:
185 DEBUG1("rmtd: garbage command %c\n", c);
186 exit(3);
187 }
188 respond:
189 DEBUG1("rmtd: A %d\n", rval);
190 (void)sprintf(resp, "A%d\n", rval);
191 (void)write(STDOUT_FILENO, resp, strlen(resp));
192 goto top;
193 ioerror:
194 error(errno);
195 goto top;
196 }
197
198 void
getstring(char * bp)199 getstring(char *bp)
200 {
201 int i;
202 char *cp = bp;
203
204 for (i = 0; i < SSIZE; i++) {
205 if (read(STDIN_FILENO, cp+i, 1) != 1)
206 exit(0);
207 if (cp[i] == '\n')
208 break;
209 }
210 cp[i] = '\0';
211 }
212
213 static char *
checkbuf(char * rec,int size)214 checkbuf(char *rec, int size)
215 {
216
217 if (size <= maxrecsize)
218 return (rec);
219 if (rec != NULL)
220 free(rec);
221 rec = malloc(size);
222 if (rec == NULL) {
223 DEBUG("rmtd: cannot allocate buffer space\n");
224 exit(4);
225 }
226 maxrecsize = size;
227 while (size > 1024 &&
228 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
229 size -= 1024;
230 return (rec);
231 }
232
233 static void
error(int num)234 error(int num)
235 {
236
237 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
238 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
239 (void)write(STDOUT_FILENO, resp, strlen(resp));
240 }
241