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 1.17 2002/04/12 13:02:16 stelian Exp $";
  45 #endif /* not linux */
  46
  47 /*
  48  * rmt
  49  */
  50 #include <config.h>
  51 #include <compatlfs.h>
  52 #include <sys/types.h>
  53 #include <sys/socket.h>
  54 #include <sys/mtio.h>
  55 #include <errno.h>
  56 #include <fcntl.h>
  57 #ifndef __linux__
  58 #include <sgtty.h>
  59 #endif
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 int     tape = -1;
  66
  67 char    *record;
  68 int     maxrecsize = -1;
  69
  70 #define SSIZE   64
  71 char    device[SSIZE];
  72 char    count[SSIZE], filemode[SSIZE], pos[SSIZE], op[SSIZE];
  73
  74 char    resp[BUFSIZ];
  75
  76 FILE    *debug;
  77 #define DEBUG(f)        if (debug) fprintf(debug, f)
  78 #define DEBUG1(f,a)     if (debug) fprintf(debug, f, a)
  79 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
  80
  81 /*
  82  * Support for Sun's extended RMT protocol
  83  *      code originally written by Jörg Schilling <schilling@fokus.gmd.de>
  84  *      and relicensed by his permission from GPL to BSD for use in dump.
  85  */
  86 #define RMTI_VERSION    -1
  87 #define RMT_VERSION 1
  88
  89 /* Extended 'i' commands */
  90 #define RMTI_CACHE  0
  91 #define RMTI_NOCACHE    1
  92 #define RMTI_RETEN  2
  93 #define RMTI_ERASE  3
  94 #define RMTI_EOM    4
  95 #define RMTI_NBSF   5
  96
  97 /* Extended 's' comands */
  98 #define MTS_TYPE    'T'
  99 #define MTS_DSREG   'D'
 100 #define MTS_ERREG   'E'
 101 #define MTS_RESID   'R'
 102 #define MTS_FILENO  'F'
 103 #define MTS_BLKNO   'B'
 104 #define MTS_FLAGS   'f'
 105 #define MTS_BF      'b'
 106
 107 char    *checkbuf __P((char *, int));
 108 void     error __P((int));
 109 void     getstring __P((char *));
 110
 111 int
 112 main(int argc, char *argv[])
 113 {
 114         int rval = 0;
 115         char c;
 116         int n, i, cc;
 117         unsigned long block = 0;
 118
 119         argc--, argv++;
 120         if (argc > 0) {
 121                 debug = fopen(*argv, "w");
 122                 if (debug == 0)
 123                         exit(1);
 124                 (void)setbuf(debug, (char *)0);
 125         }
 126 top:
 127         errno = 0;
 128         rval = 0;
 129         if (read(0, &c, 1) != 1)
 130                 exit(0);
 131         switch (c) {
 132
 133         case 'O':
 134                 if (tape >= 0)
 135                         (void) close(tape);
 136                 getstring(device);
 137                 getstring(filemode);
 138                 DEBUG2("rmtd: O %s %s\n", device, filemode);
 139                 /*
 140                  * XXX the rmt protocol does not provide a means to
 141                  * specify the permission bits; allow rw for everyone,
 142                  * as modified by the users umask
 143                  */
 144                 tape = OPEN(device, atoi(filemode), 0666);
 145                 if (tape < 0)
 146                         goto ioerror;
 147                 block = 0;
 148                 goto respond;
 149
 150         case 'C':
 151                 DEBUG1("rmtd: C  (%lu blocks)\n", block);
 152                 getstring(device);              /* discard */
 153                 if (close(tape) < 0)
 154                         goto ioerror;
 155                 tape = -1;
 156                 block = 0;
 157                 goto respond;
 158
 159         case 'L':
 160                 getstring(count);
 161                 getstring(pos);
 162                 DEBUG2("rmtd: L %s %s\n", count, pos);
 163                 rval = LSEEK(tape, (off_t)atol(count), atoi(pos));
 164                 if (rval < 0)
 165                         goto ioerror;
 166                 goto respond;
 167
 168         case 'W':
 169                 getstring(count);
 170                 n = atoi(count);
 171                 DEBUG2("rmtd: W %s (block = %lu)\n", count, block);
 172                 record = checkbuf(record, n);
 173                 for (i = 0; i < n; i += cc) {
 174                         cc = read(0, &record[i], n - i);
 175                         if (cc <= 0) {
 176                                 DEBUG("rmtd: premature eof\n");
 177                                 exit(2);
 178                         }
 179                 }
 180                 rval = write(tape, record, n);
 181                 if (rval < 0)
 182                         goto ioerror;
 183                 block += n >> 10;
 184                 goto respond;
 185
 186         case 'R':
 187                 getstring(count);
 188                 DEBUG2("rmtd: R %s (block %lu)\n", count, block);
 189                 n = atoi(count);
 190                 record = checkbuf(record, n);
 191                 rval = read(tape, record, n);
 192                 if (rval < 0)
 193                         goto ioerror;
 194                 (void)sprintf(resp, "A%d\n", rval);
 195                 (void)write(1, resp, strlen(resp));
 196                 (void)write(1, record, rval);
 197                 block += n >> 10;
 198                 goto top;
 199
 200         case 'I':
 201                 getstring(op);
 202                 getstring(count);
 203                 DEBUG2("rmtd: I %s %s\n", op, count);
 204                 if (atoi(op) == RMTI_VERSION) {
 205                         rval = RMT_VERSION;
 206                 } else {
 207                   struct mtop mtop;
 208                   mtop.mt_op = atoi(op);
 209                   mtop.mt_count = atoi(count);
 210                   if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
 211                         goto ioerror;
 212                   rval = mtop.mt_count;
 213                 }
 214                 goto respond;
 215
 216         case 'i':
 217         {       struct mtop mtop;
 218
 219                 getstring (op);
 220                 getstring (count);
 221                 DEBUG2 ("rmtd: i %s %s\n", op, count);
 222                 switch (atoi(op)) {
 223 #ifdef MTCACHE
 224                         case RMTI_CACHE:
 225                                 mtop.mt_op = MTCACHE;
 226                                 break;
 227 #endif
 228 #ifdef MTNOCACHE
 229                         case RMTI_NOCACHE:
 230                                 mtop.mt_op = MTNOCACHE;
 231                                 break;
 232 #endif
 233 #ifdef MTRETEN
 234                         case RMTI_RETEN:
 235                                 mtop.mt_op = MTRETEN;
 236                                 break;
 237 #endif
 238 #ifdef MTERASE
 239                         case RMTI_ERASE:
 240                                 mtop.mt_op = MTERASE;
 241                                 break;
 242 #endif
 243 #ifdef MTEOM
 244                         case RMTI_EOM:
 245                                 mtop.mt_op = MTEOM;
 246                                 break;
 247 #endif
 248 #ifdef MTNBSF
 249                         case RMTI_NBSF:
 250                                 mtop.mt_op = MTNBSF;
 251                                 break;
 252 #endif
 253                         default:
 254                                 errno = EINVAL;
 255                                 goto ioerror;
 256                 }
 257                 mtop.mt_count = atoi (count);
 258                 if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0)
 259                         goto ioerror;
 260
 261                 rval = mtop.mt_count;
 262
 263                 goto respond;
 264         }
 265
 266         case 'S':               /* status */
 267                 DEBUG("rmtd: S\n");
 268                 { struct mtget mtget;
 269                   if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
 270                         goto ioerror;
 271                   rval = sizeof (mtget);
 272                   (void)sprintf(resp, "A%d\n", rval);
 273                   (void)write(1, resp, strlen(resp));
 274                   (void)write(1, (char *)&mtget, sizeof (mtget));
 275                   goto top;
 276                 }
 277
 278         case 's':
 279         {       char s;
 280                 struct mtget mtget;
 281
 282                 if (read (0, &s, 1) != 1)
 283                         goto top;
 284
 285                 if (ioctl (tape, MTIOCGET, (char *) &mtget) < 0)
 286                         goto ioerror;
 287
 288                 switch (s) {
 289                         case MTS_TYPE:
 290                                 rval = mtget.mt_type;
 291                                 break;
 292                         case MTS_DSREG:
 293                                 rval = mtget.mt_dsreg;
 294                                 break;
 295                         case MTS_ERREG:
 296                                 rval = mtget.mt_erreg;
 297                                 break;
 298                         case MTS_RESID:
 299                                 rval = mtget.mt_resid;
 300                                 break;
 301                         case MTS_FILENO:
 302                                 rval = mtget.mt_fileno;
 303                                 break;
 304                         case MTS_BLKNO:
 305                                 rval = mtget.mt_blkno;
 306                                 break;
 307                         case MTS_FLAGS:
 308                                 rval = mtget.mt_gstat;
 309                                 break;
 310                         case MTS_BF:
 311                                 rval = 0;
 312                                 break;
 313                         default:
 314                                 errno = EINVAL;
 315                                 goto ioerror;
 316                 }
 317
 318                 goto respond;
 319         }
 320
 321         case 'V':               /* version */
 322                 getstring(op);
 323                 DEBUG1("rmtd: V %s\n", op);
 324                 rval = 2;
 325                 goto respond;
 326
 327         default:
 328                 DEBUG1("rmtd: garbage command %c\n", c);
 329                 exit(3);
 330         }
 331 respond:
 332         DEBUG1("rmtd: A %d\n", rval);
 333         (void)sprintf(resp, "A%d\n", rval);
 334         (void)write(1, resp, strlen(resp));
 335         goto top;
 336 ioerror:
 337         error(errno);
 338         goto top;
 339 }
 340
 341 void getstring(char *bp)
 342 {
 343         int i;
 344         char *cp = bp;
 345
 346         for (i = 0; i < SSIZE; i++) {
 347                 if (read(0, cp+i, 1) != 1)
 348                         exit(0);
 349                 if (cp[i] == '\n')
 350                         break;
 351         }
 352         cp[i] = '\0';
 353 }
 354
 355 char *
 356 checkbuf(char *record, int size)
 357 {
 358
 359         if (size <= maxrecsize)
 360                 return (record);
 361         if (record != 0)
 362                 free(record);
 363         record = malloc(size);
 364         if (record == 0) {
 365                 DEBUG("rmtd: cannot allocate buffer space\n");
 366                 exit(4);
 367         }
 368         maxrecsize = size;
 369         while (size > 1024 &&
 370                setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 371                 size -= 1024;
 372         return (record);
 373 }
 374
 375 void
 376 error(int num)
 377 {
 378
 379         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 380         (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
 381         (void)write(1, resp, strlen(resp));
 382 }