xref: /openbsd/bin/mt/mt.c (revision 73471bf0) 
1 /*	$OpenBSD: mt.c,v 1.41 2019/06/28 13:34:59 deraadt Exp $	*/
2 /*	$NetBSD: mt.c,v 1.14.2.1 1996/05/27 15:12:11 mrg Exp $	*/
3 
4 /*
5  * Copyright (c) 1980, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 /*
34  * mt --
35  *   magnetic tape manipulation program
36  */
37 #include <sys/types.h>
38 #include <sys/ioctl.h>
39 #include <sys/mtio.h>
40 #include <sys/stat.h>
41 #include <sys/disklabel.h>
42 
43 #include <ctype.h>
44 #include <err.h>
45 #include <errno.h>
46 #include <fcntl.h>
47 #include <paths.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include <util.h>
53 #include <limits.h>
54 
55 #include "mt.h"
56 
57 struct commands {
58 	char *c_name;
59 	int c_code;
60 	int c_ronly;
61 	int c_mincount;
62 } com[] = {
63 	{ "blocksize",	MTSETBSIZ,  1, 0 },
64 	{ "bsf",	MTBSF,      1, 1 },
65 	{ "bsr",	MTBSR,      1, 1 },
66 	{ "density",	MTSETDNSTY, 1, 1 },
67 	{ "eof",	MTWEOF,     0, 1 },
68 	{ "eom",	MTEOM,      1, 1 },
69 	{ "erase",	MTERASE,    0, 1 },
70 	{ "fsf",	MTFSF,      1, 1 },
71 	{ "fsr",	MTFSR,      1, 1 },
72 	{ "offline",	MTOFFL,     1, 1 },
73 #define COM_EJECT	9	/* element in the above array */
74 	{ "rewind",	MTREW,      1, 1 },
75 	{ "rewoffl",	MTOFFL,     1, 1 },
76 	{ "status",	MTNOP,      1, 1 },
77 	{ "retension",	MTRETEN,    1, 1 },
78 #define COM_RETEN	13	/* element in the above array */
79 	{ "weof",	MTWEOF,     0, 1 },
80 	{ NULL }
81 };
82 
83 void printreg(char *, u_int, char *);
84 void status(struct mtget *);
85 void usage(void);
86 
87 int		_rmtopendev(char *path, int oflags, int dflags, char **realp);
88 int		_rmtmtioctop(int fd, struct mtop *cmd);
89 struct mtget	*_rmtstatus(int fd);
90 void		_rmtclose(void);
91 
92 extern char	*__progname;
93 
94 char	*host = NULL;	/* remote host (if any) */
95 
96 int
97 _rmtopendev(char *path, int oflags, int dflags, char **realp)
98 {
99 #ifdef RMT
100 	if (host)
101 		return rmtopen(path, oflags);
102 #endif
103 	return opendev(path, oflags, dflags, realp);
104 }
105 
106 int
107 _rmtmtioctop(int fd, struct mtop *cmd)
108 {
109 #ifdef RMT
110 	if (host)
111 		return rmtioctl(cmd->mt_op, cmd->mt_count);
112 #endif
113 	return ioctl(fd, MTIOCTOP, cmd);
114 }
115 
116 struct mtget *
117 _rmtstatus(int fd)
118 {
119 	static struct mtget mt_status;
120 
121 #ifdef RMT
122 	if (host)
123 		return rmtstatus();
124 #endif
125 	if (ioctl(fd, MTIOCGET, &mt_status) == -1)
126 		err(2, "ioctl MTIOCGET");
127 	return &mt_status;
128 }
129 
130 void
131 _rmtclose(void)
132 {
133 #ifdef RMT
134 	if (host)
135 		rmtclose();
136 #endif
137 }
138 
139 int	eject = 0;
140 
141 int
142 main(int argc, char *argv[])
143 {
144 	struct commands *comp;
145 	struct mtop mt_com;
146 	int ch, mtfd, flags, insert = 0;
147 	char *p, *tape, *realtape, *opts;
148 	size_t len;
149 
150 	if (strcmp(__progname, "eject") == 0) {
151 		opts = "t";
152 		eject = 1;
153 		tape = NULL;
154 	} else {
155 		opts = "f:";
156 		if ((tape = getenv("TAPE")) == NULL)
157 			tape = _PATH_DEFTAPE;
158 	}
159 
160 	while ((ch = getopt(argc, argv, opts)) != -1) {
161 		switch (ch) {
162 		case 't':
163 			insert = 1;
164 			break;
165 		case 'f':
166 			tape = optarg;
167 			break;
168 		default:
169 			usage();
170 		}
171 	}
172 	argc -= optind;
173 	argv += optind;
174 
175 	if (eject) {
176 		if (argc == 1) {
177 			tape = *argv++;
178 			argc--;
179 		}
180 		if (argc != 0)
181 			usage();
182 	} else if (argc < 1 || argc > 2)
183 		usage();
184 
185 	if (tape == NULL)
186 		usage();
187 
188 	if (strchr(tape, ':')) {
189 #ifdef RMT
190 		host = tape;
191 		tape = strchr(host, ':');
192 		*tape++ = '\0';
193 		if (rmthost(host) == 0)
194 			exit(X_ABORT);
195 #else
196 		err(1, "no remote support");
197 #endif
198 	}
199 
200 	if (strlen(tape) >= PATH_MAX)
201 		err(1, "tape name too long for protocol");
202 
203 	if (eject) {
204 		if (insert)
205 			comp = &com[COM_RETEN];
206 		else
207 			comp = &com[COM_EJECT];
208 	} else {
209 		len = strlen(p = *argv++);
210 		for (comp = com;; comp++) {
211 			if (comp->c_name == NULL)
212 				errx(1, "%s: unknown command", p);
213 			if (strncmp(p, comp->c_name, len) == 0)
214 				break;
215 		}
216 	}
217 
218 	flags = comp->c_ronly ? O_RDONLY : O_WRONLY | O_CREAT;
219 	/* NOTE: OPENDEV_PART required since cd(4) devices go through here. */
220 	if ((mtfd = _rmtopendev(tape, flags, OPENDEV_PART, &realtape)) == -1) {
221 		if (errno != 0)
222 			warn("%s", host ? tape : realtape);
223 		exit(2);
224 	}
225 	if (comp->c_code != MTNOP) {
226 		mt_com.mt_op = comp->c_code;
227 		if (*argv) {
228 			mt_com.mt_count = strtol(*argv, &p, 10);
229 			if (mt_com.mt_count < comp->c_mincount || *p)
230 				errx(2, "%s: illegal count", *argv);
231 		}
232 		else
233 			mt_com.mt_count = 1;
234 		if (_rmtmtioctop(mtfd, &mt_com) == -1) {
235 			if (eject)
236 				err(2, "%s", tape);
237 			else
238 				err(2, "%s: %s", tape, comp->c_name);
239 		}
240 	} else {
241 		status(_rmtstatus(mtfd));
242 	}
243 
244 	_rmtclose();
245 
246 	exit(X_FINOK);
247 	/* NOTREACHED */
248 }
249 
250 struct tape_desc {
251 	short	t_type;		/* type of magtape device */
252 	char	*t_name;	/* printing name */
253 	char	*t_dsbits;	/* "drive status" register */
254 	char	*t_erbits;	/* "error" register */
255 } tapes[] = {
256 #define SCSI_DS_BITS	"\20\5WriteProtect\2Mounted"
257 	{ 0x7,		"SCSI",		SCSI_DS_BITS,	"76543210" },
258 	{ 0 }
259 };
260 
261 /*
262  * Interpret the status buffer returned
263  */
264 void
265 status(struct mtget *bp)
266 {
267 	struct tape_desc *mt;
268 
269 	for (mt = tapes;; mt++) {
270 		if (mt->t_type == 0) {
271 			(void)printf("%d: unknown tape drive type\n",
272 			    bp->mt_type);
273 			return;
274 		}
275 		if (mt->t_type == bp->mt_type)
276 			break;
277 	}
278 	(void)printf("%s tape drive, residual=%d\n", mt->t_name, bp->mt_resid);
279 	printreg("ds", bp->mt_dsreg, mt->t_dsbits);
280 	printreg("\ner", bp->mt_erreg, mt->t_erbits);
281 	(void)putchar('\n');
282 	(void)printf("blocksize: %d (%d)\n", bp->mt_blksiz, bp->mt_mblksiz);
283 	(void)printf("density: %d (%d)\n", bp->mt_density, bp->mt_mdensity);
284 	(void)printf("current file number: %d\n", bp->mt_fileno);
285 	(void)printf("current block number: %d\n", bp->mt_blkno);
286 }
287 
288 /*
289  * Print a register a la the %b format of the kernel's printf.
290  */
291 void
292 printreg(char *s, u_int v, char *bits)
293 {
294 	int i, any = 0;
295 	char c;
296 
297 	if (bits && *bits == 8)
298 		printf("%s=%o", s, v);
299 	else
300 		printf("%s=%x", s, v);
301 	if (!bits)
302 		return;
303 	bits++;
304 	if (v && *bits) {
305 		putchar('<');
306 		while ((i = *bits++)) {
307 			if (v & (1 << (i-1))) {
308 				if (any)
309 					putchar(',');
310 				any = 1;
311 				for (; (c = *bits) > 32; bits++)
312 					putchar(c);
313 			} else
314 				for (; *bits > 32; bits++)
315 					;
316 		}
317 		putchar('>');
318 	}
319 }
320 
321 void
322 usage(void)
323 {
324 	if (eject)
325 		(void)fprintf(stderr, "usage: %s [-t] device\n", __progname);
326 	else
327 		(void)fprintf(stderr,
328 		    "usage: %s [-f device] command [count]\n", __progname);
329 	exit(X_USAGE);
330 }
331