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. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #ifndef lint
  39 static const char rcsid[] =
  40         "$Id: rmt.c,v 1.27 2003/10/26 16:05:49 stelian Exp $";
  41 #endif /* not linux */
  42
  43 /*
  44  * rmt
  45  */
  46 #include <config.h>
  47 #include <compatlfs.h>
  48 #include <rmtflags.h>
  49 #include <sys/types.h>
  50 #include <sys/socket.h>
  51 #include <sys/mtio.h>
  52 #include <errno.h>
  53 #include <fcntl.h>
  54 #ifndef __linux__
  55 #include <sgtty.h>
  56 #endif
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <unistd.h>
  61
  62 static int      tape = -1;
  63
  64 static char     *record;
  65 static int      maxrecsize = -1;
  66
  67 #define SSIZE   64
  68 static char     device[SSIZE];
  69 static char     count[SSIZE], filemode[SSIZE], pos[SSIZE], op[SSIZE];
  70
  71 static char     resp[BUFSIZ];
  72
  73 static FILE     *debug;
  74 #define DEBUG(f)        if (debug) fprintf(debug, f)
  75 #define DEBUG1(f,a)     if (debug) fprintf(debug, f, a)
  76 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
  77
  78 /*
  79  * Support for Sun's extended RMT protocol
  80  *      code originally written by Jörg Schilling <schilling@fokus.gmd.de>
  81  *      and relicensed by his permission from GPL to BSD for use in dump.
  82  *
  83  *      rmt_version is 0 for regular clients (Linux included)
  84  *      rmt_version is 1 for extended clients (Sun especially). In this case
  85  *              we support some extended commands (see below) and we remap
  86  *              the ioctl commands to the UNIX "standard", as per:
  87  *                      ftp://ftp.fokus.gmd.de/pub/unix/star/README.mtio
  88  *
  89  *      In order to use rmt version 1, a client must send "I-1\n0\n"
  90  *      before issuing the other I commands.
  91  */
  92 static int      rmt_version = 0;
  93 #define RMTI_VERSION    -1
  94 #define RMT_VERSION     1
  95
  96 /* Extended 'i' commands */
  97 #define RMTI_CACHE      0
  98 #define RMTI_NOCACHE    1
  99 #define RMTI_RETEN      2
 100 #define RMTI_ERASE      3
 101 #define RMTI_EOM        4
 102 #define RMTI_NBSF       5
 103
 104 /* Extended 's' comands */
 105 #define MTS_TYPE        'T'
 106 #define MTS_DSREG       'D'
 107 #define MTS_ERREG       'E'
 108 #define MTS_RESID       'R'
 109 #define MTS_FILENO      'F'
 110 #define MTS_BLKNO       'B'
 111 #define MTS_FLAGS       'f'
 112 #define MTS_BF          'b'
 113
 114 static char     *checkbuf __P((char *, int));
 115 static void      error __P((int));
 116 static void      getstring __P((char *));
 117 static unsigned long swaplong __P((unsigned long inv));
 118 #ifdef ERMT
 119 char    *cipher __P((char *, int, int));
 120 void    decrypt __P((void));
 121 #endif
 122
 123 int
 124 main(int argc, char *argv[])
 125 {
 126         OFF_T rval = 0;
 127         char c;
 128         int n, i, cc, oflags;
 129         unsigned long block = 0;
 130         char *cp;
 131
 132         int magtape = 0;
 133
 134 #ifdef ERMT
 135         if (argc > 1 && strcmp(argv[1], "-d") == 0)
 136                 decrypt(); /* decrypt stdin to stdout, and exit() */
 137 #endif
 138         /* Skip "-c /etc/rmt", which appears when rmt is used as a shell */
 139         if (argc > 2 && strcmp(argv[1], "-c") == 0)
 140                 argc -= 2, argv += 2;
 141         argc--, argv++;
 142         if (argc > 0) {
 143                 debug = fopen(*argv, "w");
 144                 if (debug == 0)
 145                         exit(1);
 146                 (void)setbuf(debug, (char *)0);
 147         }
 148 top:
 149         errno = 0;
 150         rval = 0;
 151         if (read(0, &c, 1) != 1)
 152                 exit(0);
 153         switch (c) {
 154
 155         case 'O':
 156                 if (tape >= 0)
 157                         (void) close(tape);
 158                 getstring(device);
 159                 getstring(filemode);
 160                 DEBUG2("rmtd: O %s %s\n", device, filemode);
 161                 /*
 162                  * Translate extended GNU syntax into its numeric platform equivalent
 163                  */
 164                 oflags = rmtflags_toint(filemode);
 165 #ifdef  O_TEXT
 166                 /*
 167                  * Default to O_BINARY the client may not know that we need it.
 168                  */
 169                 if ((oflags & O_TEXT) == 0)
 170                         oflags |= O_BINARY;
 171 #endif
 172                 DEBUG2("rmtd: O %s %d\n", device, oflags);
 173                 /*
 174                  * XXX the rmt protocol does not provide a means to
 175                  * specify the permission bits; allow rw for everyone,
 176                  * as modified by the users umask
 177                  */
 178                 tape = OPEN(device, oflags, 0666);
 179                 if (tape < 0)
 180                         goto ioerror;
 181                 block = 0;
 182                 {
 183                 struct mtget mt_stat;
 184                 magtape = ioctl(tape, MTIOCGET, (char *)&mt_stat) == 0;
 185                 }
 186                 goto respond;
 187
 188         case 'C':
 189                 DEBUG1("rmtd: C  (%lu blocks)\n", block);
 190                 getstring(device);              /* discard */
 191                 if (close(tape) < 0)
 192                         goto ioerror;
 193                 tape = -1;
 194                 block = 0;
 195                 goto respond;
 196
 197 #ifdef USE_QFA
 198 #define LSEEK_GET_TAPEPOS       10
 199 #define LSEEK_GO2_TAPEPOS       11
 200 #endif
 201
 202         case 'L':
 203                 getstring(count);
 204                 getstring(pos);
 205                 DEBUG2("rmtd: L %s %s\n", count, pos);
 206                 if (!magtape) { /* traditional */
 207                         rval = LSEEK(tape, (OFF_T)atoll(count), atoi(pos));
 208                 }
 209                 else {
 210                         switch (atoi(pos)) {
 211                         case SEEK_SET:
 212                         case SEEK_CUR:
 213                         case SEEK_END:
 214                                 rval = LSEEK(tape, (OFF_T)atoll(count), atoi(pos));
 215                                 break;
 216 #ifdef USE_QFA
 217                         case LSEEK_GET_TAPEPOS: /* QFA */
 218                         case LSEEK_GO2_TAPEPOS:
 219                                 {
 220                                 struct mtop buf;
 221                                 long mtpos;
 222
 223                                 buf.mt_op = MTSETDRVBUFFER;
 224                                 buf.mt_count = MT_ST_BOOLEANS | MT_ST_SCSI2LOGICAL;
 225                                 if (ioctl(tape, MTIOCTOP, &buf) < 0) {
 226                                         goto ioerror;
 227                                 }
 228
 229                                 if (atoi(pos) == LSEEK_GET_TAPEPOS) { /* get tapepos */
 230                                         if (ioctl(tape, MTIOCPOS, &mtpos) < 0) {
 231                                                 goto ioerror;
 232                                         }
 233                                         rval = (OFF_T)mtpos;
 234                                 } else {
 235                                         buf.mt_op = MTSEEK;
 236                                         buf.mt_count = atoi(count);
 237                                         if (ioctl(tape, MTIOCTOP, &buf) < 0) {
 238                                                 goto ioerror;
 239                                         }
 240                                         rval = (OFF_T)buf.mt_count;
 241                                 }
 242                                 }
 243                                 break;
 244 #endif /* USE_QFA */
 245                         default:
 246                                 errno = EINVAL;
 247                                 goto ioerror;
 248                         }
 249                 }
 250                 if (rval < 0)
 251                         goto ioerror;
 252                 goto respond;
 253
 254         case 'W':
 255                 getstring(count);
 256                 n = atoi(count);
 257                 if (n < 1)
 258                         exit(2);
 259                 DEBUG2("rmtd: W %s (block = %lu)\n", count, block);
 260                 record = checkbuf(record, n);
 261                 for (i = 0; i < n; i += cc) {
 262                         cc = read(0, &record[i], n - i);
 263                         if (cc <= 0) {
 264                                 DEBUG("rmtd: premature eof\n");
 265                                 exit(2);
 266                         }
 267                 }
 268 #ifdef ERMT
 269                 if ((cp = cipher(record, n, 1)) == NULL)
 270                         goto ioerror;
 271 #else
 272                 cp = record;
 273 #endif
 274                 rval = write(tape, cp, n);
 275                 if (rval < 0)
 276                         goto ioerror;
 277                 block += n >> 10;
 278                 goto respond;
 279
 280         case 'R':
 281                 getstring(count);
 282                 DEBUG2("rmtd: R %s (block %lu)\n", count, block);
 283                 n = atoi(count);
 284                 record = checkbuf(record, n);
 285                 rval = read(tape, record, n);
 286                 if (rval < 0)
 287                         goto ioerror;
 288 #ifdef ERMT
 289                 if ((cp = cipher(record, rval, 0)) == NULL)
 290                         goto ioerror;
 291 #else
 292                 cp = record;
 293 #endif
 294                 (void)sprintf(resp, "A%lld\n", (long long)rval);
 295                 (void)write(1, resp, strlen(resp));
 296                 (void)write(1, cp, rval);
 297                 block += n >> 10;
 298                 goto top;
 299
 300         case 'I':
 301                 getstring(op);
 302                 getstring(count);
 303                 DEBUG2("rmtd: I %s %s\n", op, count);
 304                 if (atoi(op) == RMTI_VERSION) {
 305                         rval = RMT_VERSION;
 306                         rmt_version = 1;
 307                 }
 308                 else {
 309                         struct mtop mtop;
 310                         mtop.mt_op = -1;
 311                         if (rmt_version) {
 312                                 /* rmt version 1, assume UNIX/Solaris/Mac OS X client */
 313                                 switch (atoi(op)) {
 314 #ifdef  MTWEOF
 315                                         case 0:
 316                                                 mtop.mt_op = MTWEOF;
 317                                                 break;
 318 #endif
 319 #ifdef  MTFSF
 320                                         case 1:
 321                                                 mtop.mt_op = MTFSF;
 322                                                 break;
 323 #endif
 324 #ifdef  MTBSF
 325                                         case 2:
 326                                                 mtop.mt_op = MTBSF;
 327                                                 break;
 328 #endif
 329 #ifdef  MTFSR
 330                                         case 3:
 331                                                 mtop.mt_op = MTFSR;
 332                                                 break;
 333 #endif
 334 #ifdef  MTBSR
 335                                         case 4:
 336                                                 mtop.mt_op = MTBSR;
 337                                                 break;
 338 #endif
 339 #ifdef  MTREW
 340                                         case 5:
 341                                                 mtop.mt_op = MTREW;
 342                                                 break;
 343 #endif
 344 #ifdef  MTOFFL
 345                                         case 6:
 346                                                 mtop.mt_op = MTOFFL;
 347                                                 break;
 348 #endif
 349 #ifdef  MTNOP
 350                                         case 7:
 351                                                 mtop.mt_op = MTNOP;
 352                                                 break;
 353 #endif
 354 #ifdef  MTRETEN
 355                     case 8:
 356                         mtop.mt_op = MTRETEN;
 357                         break;
 358 #endif
 359 #ifdef  MTERASE
 360                     case 9:
 361                         mtop.mt_op = MTERASE;
 362                         break;
 363 #endif
 364 #ifdef  MTEOM
 365                     case 10:
 366                         mtop.mt_op = MTEOM;
 367                         break;
 368 #endif
 369                                 }
 370                                 if (mtop.mt_op == -1) {
 371                                         errno = EINVAL;
 372                                         goto ioerror;
 373                                 }
 374                         }
 375                         else {
 376                                 /* rmt version 0, assume linux client */
 377                                 mtop.mt_op = atoi(op);
 378                         }
 379                         mtop.mt_count = atoi(count);
 380                         if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) {
 381                                 goto ioerror;
 382                         }
 383                         rval = mtop.mt_count;
 384                 }
 385                 goto respond;
 386
 387         case 'i':
 388         {       struct mtop mtop;
 389
 390                 getstring (op);
 391                 getstring (count);
 392                 DEBUG2 ("rmtd: i %s %s\n", op, count);
 393                 switch (atoi(op)) {
 394 #ifdef MTCACHE
 395                         case RMTI_CACHE:
 396                                 mtop.mt_op = MTCACHE;
 397                                 break;
 398 #endif
 399 #ifdef MTNOCACHE
 400                         case RMTI_NOCACHE:
 401                                 mtop.mt_op = MTNOCACHE;
 402                                 break;
 403 #endif
 404 #ifdef MTRETEN
 405                         case RMTI_RETEN:
 406                                 mtop.mt_op = MTRETEN;
 407                                 break;
 408 #endif
 409 #ifdef MTERASE
 410                         case RMTI_ERASE:
 411                                 mtop.mt_op = MTERASE;
 412                                 break;
 413 #endif
 414 #ifdef MTEOM
 415                         case RMTI_EOM:
 416                                 mtop.mt_op = MTEOM;
 417                                 break;
 418 #endif
 419 #ifdef MTNBSF
 420                         case RMTI_NBSF:
 421                                 mtop.mt_op = MTNBSF;
 422                                 break;
 423 #endif
 424                         default:
 425                                 errno = EINVAL;
 426                                 goto ioerror;
 427                 }
 428                 mtop.mt_count = atoi (count);
 429                 if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0) {
 430                         goto ioerror;
 431                 }
 432
 433                 rval = mtop.mt_count;
 434
 435                 goto respond;
 436         }
 437
 438         case 'S':               /* status */
 439                 DEBUG("rmtd: S\n");
 440                 { struct mtget mtget;
 441
 442                   if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) {
 443                         goto ioerror;
 444                   }
 445
 446                   if (rmt_version) {
 447                         rval = sizeof(mtget);
 448                         /* assume byte order:
 449                         Linux on Intel (little), Solaris on SPARC (big), Mac OS X on PPC (big)
 450                         thus need byte swapping from little to big
 451                         */
 452                         mtget.mt_type = swaplong(mtget.mt_type);
 453                         mtget.mt_resid = swaplong(mtget.mt_resid);
 454                         mtget.mt_dsreg = swaplong(mtget.mt_dsreg);
 455                         mtget.mt_gstat = swaplong(mtget.mt_gstat);
 456                         mtget.mt_erreg = swaplong(mtget.mt_erreg);
 457                         mtget.mt_fileno = swaplong(mtget.mt_fileno);
 458                         mtget.mt_blkno = swaplong(mtget.mt_blkno);
 459                         (void)sprintf(resp, "A%lld\n", (long long)rval);
 460                         (void)write(1, resp, strlen(resp));
 461                         (void)write(1, (char *)&mtget, sizeof (mtget));
 462                   } else {
 463                         rval = sizeof (mtget);
 464                         (void)sprintf(resp, "A%lld\n", (long long)rval);
 465                         (void)write(1, resp, strlen(resp));
 466                         (void)write(1, (char *)&mtget, sizeof (mtget));
 467                   }
 468                   goto top;
 469                 }
 470
 471         case 's':
 472         {       char s;
 473                 struct mtget mtget;
 474
 475                 DEBUG ("rmtd: s\n");
 476
 477                 if (read (0, &s, 1) != 1)
 478                         goto top;
 479                 DEBUG1 ("rmtd: s %d\n", s);
 480
 481                 if (ioctl (tape, MTIOCGET, (char *) &mtget) < 0) {
 482                         goto ioerror;
 483                 }
 484
 485                 switch (s) {
 486                         case MTS_TYPE:
 487                                 rval = mtget.mt_type;
 488                                 break;
 489                         case MTS_DSREG:
 490                                 rval = mtget.mt_dsreg;
 491                                 break;
 492                         case MTS_ERREG:
 493                                 rval = mtget.mt_erreg;
 494                                 break;
 495                         case MTS_RESID:
 496                                 rval = mtget.mt_resid;
 497                                 break;
 498                         case MTS_FILENO:
 499                                 rval = mtget.mt_fileno;
 500                                 break;
 501                         case MTS_BLKNO:
 502                                 rval = mtget.mt_blkno;
 503                                 break;
 504                         case MTS_FLAGS:
 505                                 rval = mtget.mt_gstat;
 506                                 break;
 507                         case MTS_BF:
 508                                 rval = 0;
 509                                 break;
 510                         default:
 511                                 errno = EINVAL;
 512                                 goto ioerror;
 513                 }
 514
 515                 goto respond;
 516         }
 517
 518         case 'V':       /* version */
 519                 getstring(op);
 520                 DEBUG1("rmtd: V %s\n", op);
 521                 rval = 2;
 522                 goto respond;
 523
 524         default:
 525                 DEBUG1("rmtd: garbage command %c\n", c);
 526                 exit(3);
 527         }
 528 respond:
 529         DEBUG1("rmtd: A %lld\n", (long long)rval);
 530         (void)sprintf(resp, "A%lld\n", (long long)rval);
 531         (void)write(1, resp, strlen(resp));
 532         goto top;
 533 ioerror:
 534         error(errno);
 535         goto top;
 536 }
 537
 538 static void getstring(char *bp)
 539 {
 540         int i;
 541         char *cp = bp;
 542
 543         for (i = 0; i < SSIZE - 1; i++) {
 544                 if (read(0, cp+i, 1) != 1)
 545                         exit(0);
 546                 if (cp[i] == '\n')
 547                         break;
 548         }
 549         cp[i] = '\0';
 550 }
 551
 552 static char *
 553 checkbuf(char *record, int size)
 554 {
 555
 556         if (size <= maxrecsize)
 557                 return (record);
 558         if (record != 0)
 559                 free(record);
 560         record = malloc(size);
 561         if (record == 0) {
 562                 DEBUG("rmtd: cannot allocate buffer space\n");
 563                 exit(4);
 564         }
 565         maxrecsize = size;
 566         while (size > 1024 &&
 567                setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 568                 size -= 1024;
 569         return (record);
 570 }
 571
 572 static void
 573 error(int num)
 574 {
 575
 576         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 577         (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
 578         (void)write(1, resp, strlen(resp));
 579 }
 580
 581 static unsigned long
 582 swaplong(unsigned long inv)
 583 {
 584          union lconv {
 585                 unsigned long   ul;
 586                 unsigned char   uc[4];
 587         } *inp, outv;
 588
 589         inp = (union lconv *)&inv;
 590
 591         outv.uc[0] = inp->uc[3];
 592         outv.uc[1] = inp->uc[2];
 593         outv.uc[2] = inp->uc[1];
 594         outv.uc[3] = inp->uc[0];
 595
 596         return (outv.ul);
 597 }