aboutsummaryrefslogtreecommitdiff
path: root/src/rmt.c
blob: d616b9e136a4fbe593bb0165e3f7c19b56e4a561 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

/*
 * rmt
 */
#if defined(HAVE_CONFIG_H)
# include <config.h>
#endif

#include <stdio.h>
#ifndef __linux
/* Kludge alert:  We should really fix this by having configure figure
   out if we need sgtty.h or not, so it can define HAVE_SGGTY_H and
   also add rmt to the build targets.  For now we'll just add this
   ifndef so make rmt will work on Linux.  */
#include <sgtty.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_GENTAPE_H	/* e.g., ISC UNIX */
#include <sys/gentape.h>
#else
#ifdef M_UNIX
#include <sys/tape.h>
#else
#include <sys/mtio.h>
#endif
#endif
#include <errno.h>

/* Debian hack: gcc has exhibited problems loading fcntl.h.  Therefore,
   I removed the preprocessor conditionals here - BEM */
#include <fcntl.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#else
long lseek ();
#endif

#ifdef STDC_HEADERS
#include <string.h>
#include <stdlib.h>
#else
extern char *malloc ();
#endif

#include <errno.h>
#if !HAVE_DECL_STRERROR
extern const char *strerror (int en);
#endif

int tape = -1;

char *record;
int maxrecsize = -1;
char *checkbuf ();
void getstring ();
void error ();

#define	SSIZE	64
char device[SSIZE];
char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];

char resp[BUFSIZ];

FILE *debug;
#define	DEBUG(f)	if (debug) fprintf(debug, f)
#define	DEBUG1(f,a)	if (debug) fprintf(debug, f, a)
#define	DEBUG2(f,a1,a2)	if (debug) fprintf(debug, f, a1, a2)

#ifdef EXTENDED_RMT_PROTOCOL
/*
 * Support for Sun's extended RMT protocol
 */
#define RMTI_VERSION	-1
#define RMT_VERSION	1

/* Extended 'i' commands */
#define RMTI_CACHE	0
#define RMTI_NOCACHE	1
#define RMTI_RETEN	2
#define RMTI_ERASE	3
#define RMTI_EOM	4
#define RMTI_NBSF	5

/* Extended 's' comands */
#define MTS_TYPE	'T'
#define MTS_DSREG	'D'
#define MTS_ERREG	'E'
#define MTS_RESID	'R'
#define MTS_FILENO	'F'
#define MTS_BLKNO	'B'
#define MTS_FLAGS	'f'
#define MTS_BF		'b'
#endif /* EXTENDED_RMT_PROTOCOL */

static struct option gnu_options[] =
  {
    {"version",     no_argument,       0, 'v'},
    {"help",        no_argument,       0, 'h'},
    {0, 0, 0, 0}
  };

void
rmt_help ()
{
  printf ("GNU rmt: remote magtape protocol module\n");
  printf ("usage: rmt [debug_file]\n");
}

int
main (argc, argv)
     int argc;
     char **argv;
{
  int rval;
  char c;
  int n, i, cc;

  while ((c = getopt_long (argc, argv, "vh", gnu_options, &n)) != EOF)
    switch (c) {
    case 'v':
      printf ("rmt (%s)\n", PACKAGE_STRING);
      return 0;

    case 'h':
      rmt_help ();
      return 0;
    }
  
  argc -= optind;
  argv += optind;
  
  if (argc > 0)
    {
      debug = fopen (*argv, "w");
      if (debug == 0)
	exit (1);
      (void) setbuf (debug, (char *) 0);
    }
top:
  errno = 0;
  rval = 0;
  if (read (0, &c, 1) != 1)
    exit (0);
  switch (c)
    {

    case 'O':
      if (tape >= 0)
	(void) close (tape);
      getstring (device);
      getstring (mode);
      DEBUG2 ("rmtd: O %s %s\n", device, mode);
#if defined (i386) && defined (AIX)
      /* This is alleged to fix a byte ordering problem. */
      /* I'm quite suspicious if it's right. -- mib */
      {
	int oflag = atoi (mode);
	int nflag = 0;
	if ((oflag & 3) == 0)
	  nflag |= O_RDONLY;
	if (oflag & 1)
	  nflag |= O_WRONLY;
	if (oflag & 2)
	  nflag |= O_RDWR;
	if (oflag & 0x0008)
	  nflag |= O_APPEND;
	if (oflag & 0x0200)
	  nflag |= O_CREAT;
	if (oflag & 0x0400)
	  nflag |= O_TRUNC;
	if (oflag & 0x0800)
	  nflag |= O_EXCL;
	tape = open (device, nflag, 0666);
      }
#else
      tape = open (device, atoi (mode), 0666);
#endif
      if (tape < 0)
	goto ioerror;
      goto respond;

    case 'C':
      DEBUG ("rmtd: C\n");
      getstring (device);	/* discard */
      if (close (tape) < 0)
	goto ioerror;
      tape = -1;
      goto respond;

    case 'L':
      getstring (count);
      getstring (pos);
      DEBUG2 ("rmtd: L %s %s\n", count, pos);
      rval = lseek (tape, (long) atoi (count), atoi (pos));
      if (rval < 0)
	goto ioerror;
      goto respond;

    case 'W':
      getstring (count);
      n = atoi (count);
      DEBUG1 ("rmtd: W %s\n", count);
      record = checkbuf (record, n);
      for (i = 0; i < n; i += cc)
	{
	  cc = read (0, &record[i], n - i);
	  if (cc <= 0)
	    {
	      DEBUG ("rmtd: premature eof\n");
	      exit (2);
	    }
	}
      rval = write (tape, record, n);
      if (rval < 0)
	goto ioerror;
      goto respond;

    case 'R':
      getstring (count);
      DEBUG1 ("rmtd: R %s\n", count);
      n = atoi (count);
      record = checkbuf (record, n);
      rval = read (tape, record, n);
      if (rval < 0)
	goto ioerror;
      (void) sprintf (resp, "A%d\n", rval);
      (void) write (1, resp, strlen (resp));
      (void) write (1, record, rval);
      goto top;

    case 'I':
      getstring (op);
      getstring (count);
      DEBUG2 ("rmtd: I %s %s\n", op, count);
#ifdef EXTENDED_RMT_PROTOCOL
      if (atoi(op) == RMTI_VERSION)
      {
	  rval = RMT_VERSION;
      }
#endif /* EXTENDED_RMT_PROTOCOL */
#ifdef MTIOCTOP
#ifdef EXTENDED_RMT_PROTOCOL
      else
#endif /* EXTENDED_RMT_PROTOCOL */
      {
	struct mtop mtop;
	mtop.mt_op = atoi (op);
	mtop.mt_count = atoi (count);
	if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0)
	  goto ioerror;
	rval = mtop.mt_count;
      }
#endif
      goto respond;

#ifdef EXTENDED_RMT_PROTOCOL
    case 'i':
      {
	struct mtop mtop;
	
	getstring (op);
	getstring (count);
	DEBUG2 ("rmtd: i %s %s\n", op, count);
	switch (atoi(op))
	{
#ifdef MTCACHE
	  case RMTI_CACHE:
	    mtop.mt_op = MTCACHE;
	    break;
#endif
#ifdef MTNOCACHE
	  case RMTI_NOCACHE:
	    mtop.mt_op = MTNOCACHE;
	    break;
#endif
#ifdef MTRETEN
	  case RMTI_RETEN:
	    mtop.mt_op = MTRETEN;
	    break;
#endif
#ifdef MTERASE
	  case RMTI_ERASE:
	    mtop.mt_op = MTERASE;
	    break;
#endif
#ifdef MTEOM
	  case RMTI_EOM:
	    mtop.mt_op = MTEOM;
	    break;
#endif
#ifdef MTNBSF
	  case RMTI_NBSF:
	    mtop.mt_op = MTNBSF;
	    break;
#endif
	  default:
	    errno = EINVAL;
	    goto ioerror;
	}
#ifdef MTIOCTOP
	mtop.mt_count = atoi (count);
	if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0)
	  goto ioerror;
	rval = mtop.mt_count;
      }
#endif
      goto respond;
#endif /* EXTENDED_RMT_PROTOCOL */

    case 'S':			/* status */
      DEBUG ("rmtd: S\n");
      {
#ifdef MTIOCGET
	struct mtget mtget;
	if (ioctl (tape, MTIOCGET, (char *) &mtget) < 0)
	  goto ioerror;
	rval = sizeof (mtget);
	(void) sprintf (resp, "A%d\n", rval);
	(void) write (1, resp, strlen (resp));
	(void) write (1, (char *) &mtget, sizeof (mtget));
#endif
	goto top;
      }

#ifdef EXTENDED_RMT_PROTOCOL
    case 's':
      {
	char s;
	struct mtget mtget;

	if (read (0, &s, 1) != 1)
	  goto top;
	
#ifdef MTIOCGET
	if (ioctl (tape, MTIOCGET, (char *) &mtget) < 0)
	  goto ioerror;
#endif
	switch (s)
	{
	  case MTS_TYPE:
	    rval = mtget.mt_type;
	    break;

	  case MTS_DSREG:
	    rval = mtget.mt_dsreg;
	    break;

	  case MTS_ERREG:
	    rval = mtget.mt_erreg;
	    break;

	  case MTS_RESID:
	    rval = mtget.mt_resid;
	    break;

	  case MTS_FILENO:
	    rval = mtget.mt_fileno;
	    break;

	  case MTS_BLKNO:
	    rval = mtget.mt_blkno;
	    break;

	  case MTS_FLAGS:
	    rval = mtget.mt_gstat;
	    break;

	  case MTS_BF:
	    rval = 0;
	    break;

	  default:
	    errno = EINVAL;
	    goto ioerror;
	}
	goto respond;
      }
#endif /* EXTENDED_RMT_PROTOCOL */

    default:
      DEBUG1 ("rmtd: garbage command %c\n", c);
      exit (3);
    }
respond:
  DEBUG1 ("rmtd: A %d\n", rval);
  (void) sprintf (resp, "A%d\n", rval);
  (void) write (1, resp, strlen (resp));
  goto top;
ioerror:
  error (errno);
  goto top;
}

void
getstring (bp)
     char *bp;
{
  int i;
  char *cp = bp;

  for (i = 0; i < SSIZE; i++)
    {
      if (read (0, cp + i, 1) != 1)
	exit (0);
      if (cp[i] == '\n')
	break;
    }
  cp[i] = '\0';
}

char *
checkbuf (record, size)
     char *record;
     int size;
{
  if (size <= maxrecsize)
    return (record);
  if (record != 0)
    free (record);
  record = malloc (size);
  if (record == 0)
    {
      DEBUG ("rmtd: cannot allocate buffer space\n");
      exit (4);
    }
  maxrecsize = size;
#ifdef SO_RCVBUF
  while (size > 1024 &&
   setsockopt (0, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof (size)) < 0)
    size -= 1024;
#else
  size = 1 + ((size - 1) % 1024);
#endif
  return (record);
}

void
error (num)
     int num;
{

/* Debian hack: rmt has problems on systems (such as the Hurd) where
   sys_errlist is not available therefore I borrowed some code from
   error.c to fix this problem.  This has been reported to the upstream
   maintainers.  (7/22/99) - BEM */
  DEBUG2 ("rmtd: E %d (%s)\n", num, strerror (num));
  (void) sprintf (resp, "E%d\n%s\n", num, strerror (num));
  (void) write (1, resp, strlen (resp));
}

Return to:

Send suggestions and report system problems to the System administrator.