1 /* $NetBSD: rmt.c,v 1.17 2018/01/23 21:06:25 sevan 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. 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 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93";
41 #else
42 __RCSID("$NetBSD: rmt.c,v 1.17 2018/01/23 21:06:25 sevan Exp $");
43 #endif
44 #endif /* not lint */
45
46 /*
47 * rmt
48 */
49 #include <sys/types.h>
50 #include <sys/ioctl.h>
51 #include <sys/mtio.h>
52 #include <sys/socket.h>
53 #include <sys/stat.h>
54
55 #include <errno.h>
56 #include <fcntl.h>
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <string.h>
60 #include <unistd.h>
61
62 int tape = -1;
63
64 int maxrecsize = -1;
65
66 #define SSIZE 64
67 char device[SSIZE];
68 char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
69
70 char resp[BUFSIZ];
71
72 FILE *debug;
73 #define DEBUG(f) if (debug) fprintf(debug, f)
74 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a)
75 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
76
77 char *checkbuf(char *, int);
78 void error(int);
79 void getstring(char *, size_t);
80
81 int
main(int argc,char * argv[])82 main(int argc, char *argv[])
83 {
84 char *record = NULL;
85 int rval;
86 char c;
87 int n, i, cc;
88
89 argc--, argv++;
90 if (argc > 0) {
91 debug = fopen(*argv, "w");
92 if (debug == 0)
93 exit(1);
94 (void)setbuf(debug, (char *)0);
95 }
96 top:
97 errno = 0;
98 rval = 0;
99 if (read(STDIN_FILENO, &c, 1) != 1)
100 exit(0);
101 switch (c) {
102
103 case 'O':
104 if (tape >= 0)
105 (void) close(tape);
106 getstring(device, sizeof(device));
107 getstring(mode, sizeof(mode));
108 DEBUG2("rmtd: O %s %s\n", device, mode);
109 tape = open(device, atoi(mode),
110 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
111 if (tape < 0)
112 goto ioerror;
113 goto respond;
114
115 case 'C':
116 DEBUG("rmtd: C\n");
117 getstring(device, sizeof(device)); /* discard */
118 if (close(tape) < 0)
119 goto ioerror;
120 tape = -1;
121 goto respond;
122
123 case 'L':
124 getstring(count, sizeof(count));
125 getstring(pos, sizeof(pos));
126 DEBUG2("rmtd: L %s %s\n", count, pos);
127 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos));
128 if (rval < 0)
129 goto ioerror;
130 goto respond;
131
132 case 'W':
133 getstring(count, sizeof(count));
134 n = atoi(count);
135 DEBUG1("rmtd: W %s\n", count);
136 record = checkbuf(record, n);
137 for (i = 0; i < n; i += cc) {
138 cc = read(STDIN_FILENO, &record[i], n - i);
139 if (cc <= 0) {
140 DEBUG("rmtd: premature eof\n");
141 exit(2);
142 }
143 }
144 rval = write(tape, record, n);
145 if (rval < 0)
146 goto ioerror;
147 goto respond;
148
149 case 'R':
150 getstring(count, sizeof(count));
151 DEBUG1("rmtd: R %s\n", count);
152 n = atoi(count);
153 record = checkbuf(record, n);
154 rval = read(tape, record, n);
155 if (rval < 0)
156 goto ioerror;
157 (void)snprintf(resp, sizeof(resp), "A%d\n", rval);
158 (void)write(STDOUT_FILENO, resp, strlen(resp));
159 (void)write(STDOUT_FILENO, record, rval);
160 goto top;
161
162 case 'I':
163 getstring(op, sizeof(op));
164 getstring(count, sizeof(count));
165 DEBUG2("rmtd: I %s %s\n", op, count);
166 {
167 struct mtop mtop;
168
169 mtop.mt_op = atoi(op);
170 mtop.mt_count = atoi(count);
171 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
172 goto ioerror;
173 rval = mtop.mt_count;
174 }
175 goto respond;
176
177 case 'S': /* status */
178 DEBUG("rmtd: S\n");
179 {
180 struct mtget mtget;
181
182 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
183 goto ioerror;
184 rval = sizeof (mtget);
185 /* limit size to 'original' mtget size */
186 if (rval > 24)
187 rval = 24;
188 (void)snprintf(resp, sizeof(resp), "A%d\n", rval);
189 (void)write(STDOUT_FILENO, resp, strlen(resp));
190 (void)write(STDOUT_FILENO, (char *)&mtget, rval);
191 goto top;
192 }
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)snprintf(resp, sizeof(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
getstring(char * bp,size_t size)209 getstring(char *bp, size_t size)
210 {
211 char *cp = bp;
212 char *ep = bp + size - 1;
213
214 do {
215 if (read(STDIN_FILENO, cp, 1) != 1)
216 exit(0);
217 } while (*cp != '\n' && ++cp < ep);
218 *cp = '\0';
219 }
220
221 char *
checkbuf(char * record,int size)222 checkbuf(char *record, int size)
223 {
224
225 if (size <= maxrecsize)
226 return (record);
227 if (record != 0)
228 free(record);
229 record = malloc(size);
230 if (record == 0) {
231 DEBUG("rmtd: cannot allocate buffer space\n");
232 exit(4);
233 }
234 maxrecsize = size;
235 while (size > 1024 &&
236 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
237 size -= 1024;
238 return (record);
239 }
240
241 void
error(int num)242 error(int num)
243 {
244
245 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
246 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
247 (void)write(STDOUT_FILENO, resp, strlen(resp));
248 }
249