rmt/rmt.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <stelian@popies.net>, 1999-2000
   6  *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
   7  */
   8
   9 /*
  10  * Copyright (c) 1983, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] =
  44         "$Id: rmt.c,v 1.23 2003/02/12 11:02:31 stelian Exp $";
  45 #endif /* not linux */
  46
  47 /*
  48  * rmt
  49  */
  50 #include <config.h>
  51 #include <compatlfs.h>
  52 #include <rmtflags.h>
  53 #include <sys/types.h>
  54 #include <sys/socket.h>
  55 #include <sys/mtio.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #ifndef __linux__
  59 #include <sgtty.h>
  60 #endif
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65
  66 static int      tape = -1;
  67
  68 static char     *record;
  69 static int      maxrecsize = -1;
  70
  71 #define SSIZE   64
  72 static char     device[SSIZE];
  73 static char     count[SSIZE], filemode[SSIZE], pos[SSIZE], op[SSIZE];
  74
  75 static char     resp[BUFSIZ];
  76
  77 static FILE     *debug;
  78 #define DEBUG(f)        if (debug) fprintf(debug, f)
  79 #define DEBUG1(f,a)     if (debug) fprintf(debug, f, a)
  80 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
  81
  82 /*
  83  * Support for Sun's extended RMT protocol
  84  *      code originally written by Jörg Schilling <schilling@fokus.gmd.de>
  85  *      and relicensed by his permission from GPL to BSD for use in dump.
  86  *
  87  *      rmt_version is 0 for regular clients (Linux included)
  88  *      rmt_version is 1 for extended clients (Sun especially). In this case
  89  *              we support some extended commands (see below) and we remap
  90  *              the ioctl commands to the UNIX "standard", as per:
  91  *                      ftp://ftp.fokus.gmd.de/pub/unix/star/README.mtio
  92  *
  93  *      In order to use rmt version 1, a client must send "I-1\n0\n"
  94  *      before issuing the other I commands.
  95  */
  96 static int      rmt_version = 0;
  97 #define RMTI_VERSION    -1
  98 #define RMT_VERSION     1
  99
 100 /* Extended 'i' commands */
 101 #define RMTI_CACHE      0
 102 #define RMTI_NOCACHE    1
 103 #define RMTI_RETEN      2
 104 #define RMTI_ERASE      3
 105 #define RMTI_EOM        4
 106 #define RMTI_NBSF       5
 107
 108 /* Extended 's' comands */
 109 #define MTS_TYPE        'T'
 110 #define MTS_DSREG       'D'
 111 #define MTS_ERREG       'E'
 112 #define MTS_RESID       'R'
 113 #define MTS_FILENO      'F'
 114 #define MTS_BLKNO       'B'
 115 #define MTS_FLAGS       'f'
 116 #define MTS_BF          'b'
 117
 118 char    *checkbuf __P((char *, int));
 119 void     error __P((int));
 120 void     getstring __P((char *));
 121
 122 int
 123 main(int argc, char *argv[])
 124 {
 125         OFF_T rval = 0;
 126         char c;
 127         int n, i, cc, oflags;
 128         unsigned long block = 0;
 129
 130         argc--, argv++;
 131         if (argc > 0) {
 132                 debug = fopen(*argv, "w");
 133                 if (debug == 0)
 134                         exit(1);
 135                 (void)setbuf(debug, (char *)0);
 136         }
 137 top:
 138         errno = 0;
 139         rval = 0;
 140         if (read(0, &c, 1) != 1)
 141                 exit(0);
 142         switch (c) {
 143
 144         case 'O':
 145                 if (tape >= 0)
 146                         (void) close(tape);
 147                 getstring(device);
 148                 getstring(filemode);
 149                 DEBUG2("rmtd: O %s %s\n", device, filemode);
 150                 /*
 151                  * Translate extended GNU syntax into its numeric platform equivalent
 152                  */
 153                 oflags = rmtflags_toint(filemode);
 154 #ifdef  O_TEXT
 155                 /*
 156                  * Default to O_BINARY the client may not know that we need it.
 157                  */
 158                 if ((oflags & O_TEXT) == 0)
 159                         oflags |= O_BINARY;
 160 #endif
 161                 DEBUG2("rmtd: O %s %d\n", device, oflags);
 162                 /*
 163                  * XXX the rmt protocol does not provide a means to
 164                  * specify the permission bits; allow rw for everyone,
 165                  * as modified by the users umask
 166                  */
 167                 tape = OPEN(device, oflags, 0666);
 168                 if (tape < 0)
 169                         goto ioerror;
 170                 block = 0;
 171                 goto respond;
 172
 173         case 'C':
 174                 DEBUG1("rmtd: C  (%lu blocks)\n", block);
 175                 getstring(device);              /* discard */
 176                 if (close(tape) < 0)
 177                         goto ioerror;
 178                 tape = -1;
 179                 block = 0;
 180                 goto respond;
 181
 182         case 'L':
 183                 getstring(count);
 184                 getstring(pos);
 185                 DEBUG2("rmtd: L %s %s\n", count, pos);
 186                 rval = LSEEK(tape, (OFF_T)atoll(count), atoi(pos));
 187                 if (rval < 0)
 188                         goto ioerror;
 189                 goto respond;
 190
 191         case 'W':
 192                 getstring(count);
 193                 n = atoi(count);
 194                 DEBUG2("rmtd: W %s (block = %lu)\n", count, block);
 195                 record = checkbuf(record, n);
 196                 for (i = 0; i < n; i += cc) {
 197                         cc = read(0, &record[i], n - i);
 198                         if (cc <= 0) {
 199                                 DEBUG("rmtd: premature eof\n");
 200                                 exit(2);
 201                         }
 202                 }
 203                 rval = write(tape, record, n);
 204                 if (rval < 0)
 205                         goto ioerror;
 206                 block += n >> 10;
 207                 goto respond;
 208
 209         case 'R':
 210                 getstring(count);
 211                 DEBUG2("rmtd: R %s (block %lu)\n", count, block);
 212                 n = atoi(count);
 213                 record = checkbuf(record, n);
 214                 rval = read(tape, record, n);
 215                 if (rval < 0)
 216                         goto ioerror;
 217                 (void)sprintf(resp, "A%lld\n", (long long)rval);
 218                 (void)write(1, resp, strlen(resp));
 219                 (void)write(1, record, rval);
 220                 block += n >> 10;
 221                 goto top;
 222
 223         case 'I':
 224                 getstring(op);
 225                 getstring(count);
 226                 DEBUG2("rmtd: I %s %s\n", op, count);
 227                 if (atoi(op) == RMTI_VERSION) {
 228                         rval = RMT_VERSION;
 229                         rmt_version = 1;
 230                 }
 231                 else {
 232                         struct mtop mtop;
 233                         mtop.mt_op = -1;
 234                         if (rmt_version) {
 235                                 /* rmt version 1, assume UNIX client */
 236                                 switch (atoi(op)) {
 237 #ifdef  MTWEOF
 238                                         case 0:
 239                                                 mtop.mt_op = MTWEOF;
 240                                                 break;
 241 #endif
 242 #ifdef  MTFSF
 243                                         case 1:
 244                                                 mtop.mt_op = MTFSF;
 245                                                 break;
 246 #endif
 247 #ifdef  MTBSF
 248                                         case 2:
 249                                                 mtop.mt_op = MTBSF;
 250                                                 break;
 251 #endif
 252 #ifdef  MTFSR
 253                                         case 3:
 254                                                 mtop.mt_op = MTFSR;
 255                                                 break;
 256 #endif
 257 #ifdef  MTBSR
 258                                         case 4:
 259                                                 mtop.mt_op = MTBSR;
 260                                                 break;
 261 #endif
 262 #ifdef  MTREW
 263                                         case 5:
 264                                                 mtop.mt_op = MTREW;
 265                                                 break;
 266 #endif
 267 #ifdef  MTOFFL
 268                                         case 6:
 269                                                 mtop.mt_op = MTOFFL;
 270                                                 break;
 271 #endif
 272 #ifdef  MTNOP
 273                                         case 7:
 274                                                 mtop.mt_op = MTNOP;
 275                                                 break;
 276 #endif
 277                                 }
 278                                 if (mtop.mt_op == -1) {
 279                                         errno = EINVAL;
 280                                         goto ioerror;
 281                                 }
 282                         }
 283                         else {
 284                                 /* rmt version 0, assume linux client */
 285                                 mtop.mt_op = atoi(op);
 286                         }
 287                         mtop.mt_count = atoi(count);
 288                         if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
 289                                 goto ioerror;
 290                         rval = mtop.mt_count;
 291                 }
 292                 goto respond;
 293
 294         case 'i':
 295         {       struct mtop mtop;
 296
 297                 getstring (op);
 298                 getstring (count);
 299                 DEBUG2 ("rmtd: i %s %s\n", op, count);
 300                 switch (atoi(op)) {
 301 #ifdef MTCACHE
 302                         case RMTI_CACHE:
 303                                 mtop.mt_op = MTCACHE;
 304                                 break;
 305 #endif
 306 #ifdef MTNOCACHE
 307                         case RMTI_NOCACHE:
 308                                 mtop.mt_op = MTNOCACHE;
 309                                 break;
 310 #endif
 311 #ifdef MTRETEN
 312                         case RMTI_RETEN:
 313                                 mtop.mt_op = MTRETEN;
 314                                 break;
 315 #endif
 316 #ifdef MTERASE
 317                         case RMTI_ERASE:
 318                                 mtop.mt_op = MTERASE;
 319                                 break;
 320 #endif
 321 #ifdef MTEOM
 322                         case RMTI_EOM:
 323                                 mtop.mt_op = MTEOM;
 324                                 break;
 325 #endif
 326 #ifdef MTNBSF
 327                         case RMTI_NBSF:
 328                                 mtop.mt_op = MTNBSF;
 329                                 break;
 330 #endif
 331                         default:
 332                                 errno = EINVAL;
 333                                 goto ioerror;
 334                 }
 335                 mtop.mt_count = atoi (count);
 336                 if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0)
 337                         goto ioerror;
 338
 339                 rval = mtop.mt_count;
 340
 341                 goto respond;
 342         }
 343
 344         case 'S':               /* status */
 345                 DEBUG("rmtd: S\n");
 346                 { struct mtget mtget;
 347                   if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
 348                         goto ioerror;
 349                   rval = sizeof (mtget);
 350                   (void)sprintf(resp, "A%lld\n", (long long)rval);
 351                   (void)write(1, resp, strlen(resp));
 352                   (void)write(1, (char *)&mtget, sizeof (mtget));
 353                   goto top;
 354                 }
 355
 356         case 's':
 357         {       char s;
 358                 struct mtget mtget;
 359
 360                 if (read (0, &s, 1) != 1)
 361                         goto top;
 362
 363                 if (ioctl (tape, MTIOCGET, (char *) &mtget) < 0)
 364                         goto ioerror;
 365
 366                 switch (s) {
 367                         case MTS_TYPE:
 368                                 rval = mtget.mt_type;
 369                                 break;
 370                         case MTS_DSREG:
 371                                 rval = mtget.mt_dsreg;
 372                                 break;
 373                         case MTS_ERREG:
 374                                 rval = mtget.mt_erreg;
 375                                 break;
 376                         case MTS_RESID:
 377                                 rval = mtget.mt_resid;
 378                                 break;
 379                         case MTS_FILENO:
 380                                 rval = mtget.mt_fileno;
 381                                 break;
 382                         case MTS_BLKNO:
 383                                 rval = mtget.mt_blkno;
 384                                 break;
 385                         case MTS_FLAGS:
 386                                 rval = mtget.mt_gstat;
 387                                 break;
 388                         case MTS_BF:
 389                                 rval = 0;
 390                                 break;
 391                         default:
 392                                 errno = EINVAL;
 393                                 goto ioerror;
 394                 }
 395
 396                 goto respond;
 397         }
 398
 399         case 'V':               /* version */
 400                 getstring(op);
 401                 DEBUG1("rmtd: V %s\n", op);
 402                 rval = 2;
 403                 goto respond;
 404
 405         default:
 406                 DEBUG1("rmtd: garbage command %c\n", c);
 407                 exit(3);
 408         }
 409 respond:
 410         DEBUG1("rmtd: A %lld\n", (long long)rval);
 411         (void)sprintf(resp, "A%lld\n", (long long)rval);
 412         (void)write(1, resp, strlen(resp));
 413         goto top;
 414 ioerror:
 415         error(errno);
 416         goto top;
 417 }
 418
 419 void getstring(char *bp)
 420 {
 421         int i;
 422         char *cp = bp;
 423
 424         for (i = 0; i < SSIZE; i++) {
 425                 if (read(0, cp+i, 1) != 1)
 426                         exit(0);
 427                 if (cp[i] == '\n')
 428                         break;
 429         }
 430         cp[i] = '\0';
 431 }
 432
 433 char *
 434 checkbuf(char *record, int size)
 435 {
 436
 437         if (size <= maxrecsize)
 438                 return (record);
 439         if (record != 0)
 440                 free(record);
 441         record = malloc(size);
 442         if (record == 0) {
 443                 DEBUG("rmtd: cannot allocate buffer space\n");
 444                 exit(4);
 445         }
 446         maxrecsize = size;
 447         while (size > 1024 &&
 448                setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 449                 size -= 1024;
 450         return (record);
 451 }
 452
 453 void
 454 error(int num)
 455 {
 456
 457         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 458         (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
 459         (void)write(1, resp, strlen(resp));
 460 }