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 1.16 2002/01/16 09:32:14 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  */
  84 #define RMTI_VERSION    -1
  85 #define RMT_VERSION 1
  86
  87 /* Extended 'i' commands */
  88 #define RMTI_CACHE  0
  89 #define RMTI_NOCACHE    1
  90 #define RMTI_RETEN  2
  91 #define RMTI_ERASE  3
  92 #define RMTI_EOM    4
  93 #define RMTI_NBSF   5
  94
  95 /* Extended 's' comands */
  96 #define MTS_TYPE    'T'
  97 #define MTS_DSREG   'D'
  98 #define MTS_ERREG   'E'
  99 #define MTS_RESID   'R'
 100 #define MTS_FILENO  'F'
 101 #define MTS_BLKNO   'B'
 102 #define MTS_FLAGS   'f'
 103 #define MTS_BF      'b'
 104
 105 char    *checkbuf __P((char *, int));
 106 void     error __P((int));
 107 void     getstring __P((char *));
 108
 109 int
 110 main(int argc, char *argv[])
 111 {
 112         int rval = 0;
 113         char c;
 114         int n, i, cc;
 115         unsigned long block = 0;
 116
 117         argc--, argv++;
 118         if (argc > 0) {
 119                 debug = fopen(*argv, "w");
 120                 if (debug == 0)
 121                         exit(1);
 122                 (void)setbuf(debug, (char *)0);
 123         }
 124 top:
 125         errno = 0;
 126         rval = 0;
 127         if (read(0, &c, 1) != 1)
 128                 exit(0);
 129         switch (c) {
 130
 131         case 'O':
 132                 if (tape >= 0)
 133                         (void) close(tape);
 134                 getstring(device);
 135                 getstring(filemode);
 136                 DEBUG2("rmtd: O %s %s\n", device, filemode);
 137                 /*
 138                  * XXX the rmt protocol does not provide a means to
 139                  * specify the permission bits; allow rw for everyone,
 140                  * as modified by the users umask
 141                  */
 142                 tape = OPEN(device, atoi(filemode), 0666);
 143                 if (tape < 0)
 144                         goto ioerror;
 145                 block = 0;
 146                 goto respond;
 147
 148         case 'C':
 149                 DEBUG1("rmtd: C  (%lu blocks)\n", block);
 150                 getstring(device);              /* discard */
 151                 if (close(tape) < 0)
 152                         goto ioerror;
 153                 tape = -1;
 154                 block = 0;
 155                 goto respond;
 156
 157         case 'L':
 158                 getstring(count);
 159                 getstring(pos);
 160                 DEBUG2("rmtd: L %s %s\n", count, pos);
 161                 rval = LSEEK(tape, (off_t)atol(count), atoi(pos));
 162                 if (rval < 0)
 163                         goto ioerror;
 164                 goto respond;
 165
 166         case 'W':
 167                 getstring(count);
 168                 n = atoi(count);
 169                 DEBUG2("rmtd: W %s (block = %lu)\n", count, block);
 170                 record = checkbuf(record, n);
 171                 for (i = 0; i < n; i += cc) {
 172                         cc = read(0, &record[i], n - i);
 173                         if (cc <= 0) {
 174                                 DEBUG("rmtd: premature eof\n");
 175                                 exit(2);
 176                         }
 177                 }
 178                 rval = write(tape, record, n);
 179                 if (rval < 0)
 180                         goto ioerror;
 181                 block += n >> 10;
 182                 goto respond;
 183
 184         case 'R':
 185                 getstring(count);
 186                 DEBUG2("rmtd: R %s (block %lu)\n", count, block);
 187                 n = atoi(count);
 188                 record = checkbuf(record, n);
 189                 rval = read(tape, record, n);
 190                 if (rval < 0)
 191                         goto ioerror;
 192                 (void)sprintf(resp, "A%d\n", rval);
 193                 (void)write(1, resp, strlen(resp));
 194                 (void)write(1, record, rval);
 195                 block += n >> 10;
 196                 goto top;
 197
 198         case 'I':
 199                 getstring(op);
 200                 getstring(count);
 201                 DEBUG2("rmtd: I %s %s\n", op, count);
 202                 if (atoi(op) == RMTI_VERSION) {
 203                         rval = RMT_VERSION;
 204                 } else {
 205                   struct mtop mtop;
 206                   mtop.mt_op = atoi(op);
 207                   mtop.mt_count = atoi(count);
 208                   if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
 209                         goto ioerror;
 210                   rval = mtop.mt_count;
 211                 }
 212                 goto respond;
 213
 214         case 'i':
 215         {       struct mtop mtop;
 216
 217                 getstring (op);
 218                 getstring (count);
 219                 DEBUG2 ("rmtd: i %s %s\n", op, count);
 220                 switch (atoi(op)) {
 221 #ifdef MTCACHE
 222                         case RMTI_CACHE:
 223                                 mtop.mt_op = MTCACHE;
 224                                 break;
 225 #endif
 226 #ifdef MTNOCACHE
 227                         case RMTI_NOCACHE:
 228                                 mtop.mt_op = MTNOCACHE;
 229                                 break;
 230 #endif
 231 #ifdef MTRETEN
 232                         case RMTI_RETEN:
 233                                 mtop.mt_op = MTRETEN;
 234                                 break;
 235 #endif
 236 #ifdef MTERASE
 237                         case RMTI_ERASE:
 238                                 mtop.mt_op = MTERASE;
 239                                 break;
 240 #endif
 241 #ifdef MTEOM
 242                         case RMTI_EOM:
 243                                 mtop.mt_op = MTEOM;
 244                                 break;
 245 #endif
 246 #ifdef MTNBSF
 247                         case RMTI_NBSF:
 248                                 mtop.mt_op = MTNBSF;
 249                                 break;
 250 #endif
 251                         default:
 252                                 errno = EINVAL;
 253                                 goto ioerror;
 254                 }
 255                 mtop.mt_count = atoi (count);
 256                 if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0)
 257                         goto ioerror;
 258
 259                 rval = mtop.mt_count;
 260
 261                 goto respond;
 262         }
 263
 264         case 'S':               /* status */
 265                 DEBUG("rmtd: S\n");
 266                 { struct mtget mtget;
 267                   if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
 268                         goto ioerror;
 269                   rval = sizeof (mtget);
 270                   (void)sprintf(resp, "A%d\n", rval);
 271                   (void)write(1, resp, strlen(resp));
 272                   (void)write(1, (char *)&mtget, sizeof (mtget));
 273                   goto top;
 274                 }
 275
 276         case 's':
 277         {       char s;
 278                 struct mtget mtget;
 279
 280                 if (read (0, &s, 1) != 1)
 281                         goto top;
 282
 283                 if (ioctl (tape, MTIOCGET, (char *) &mtget) < 0)
 284                         goto ioerror;
 285
 286                 switch (s) {
 287                         case MTS_TYPE:
 288                                 rval = mtget.mt_type;
 289                                 break;
 290                         case MTS_DSREG:
 291                                 rval = mtget.mt_dsreg;
 292                                 break;
 293                         case MTS_ERREG:
 294                                 rval = mtget.mt_erreg;
 295                                 break;
 296                         case MTS_RESID:
 297                                 rval = mtget.mt_resid;
 298                                 break;
 299                         case MTS_FILENO:
 300                                 rval = mtget.mt_fileno;
 301                                 break;
 302                         case MTS_BLKNO:
 303                                 rval = mtget.mt_blkno;
 304                                 break;
 305                         case MTS_FLAGS:
 306                                 rval = mtget.mt_gstat;
 307                                 break;
 308                         case MTS_BF:
 309                                 rval = 0;
 310                                 break;
 311                         default:
 312                                 errno = EINVAL;
 313                                 goto ioerror;
 314                 }
 315
 316                 goto respond;
 317         }
 318
 319         case 'V':               /* version */
 320                 getstring(op);
 321                 DEBUG1("rmtd: V %s\n", op);
 322                 rval = 2;
 323                 goto respond;
 324
 325         default:
 326                 DEBUG1("rmtd: garbage command %c\n", c);
 327                 exit(3);
 328         }
 329 respond:
 330         DEBUG1("rmtd: A %d\n", rval);
 331         (void)sprintf(resp, "A%d\n", rval);
 332         (void)write(1, resp, strlen(resp));
 333         goto top;
 334 ioerror:
 335         error(errno);
 336         goto top;
 337 }
 338
 339 void getstring(char *bp)
 340 {
 341         int i;
 342         char *cp = bp;
 343
 344         for (i = 0; i < SSIZE; i++) {
 345                 if (read(0, cp+i, 1) != 1)
 346                         exit(0);
 347                 if (cp[i] == '\n')
 348                         break;
 349         }
 350         cp[i] = '\0';
 351 }
 352
 353 char *
 354 checkbuf(char *record, int size)
 355 {
 356
 357         if (size <= maxrecsize)
 358                 return (record);
 359         if (record != 0)
 360                 free(record);
 361         record = malloc(size);
 362         if (record == 0) {
 363                 DEBUG("rmtd: cannot allocate buffer space\n");
 364                 exit(4);
 365         }
 366         maxrecsize = size;
 367         while (size > 1024 &&
 368                setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 369                 size -= 1024;
 370         return (record);
 371 }
 372
 373 void
 374 error(int num)
 375 {
 376
 377         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 378         (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
 379         (void)write(1, resp, strlen(resp));
 380 }