1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)tape.c 8.9 (Berkeley) 5/1/95 39 * $FreeBSD: src/sbin/restore/tape.c,v 1.16.2.8 2002/06/30 22:57:52 iedowse Exp $ 40 * $DragonFly: src/sbin/restore/tape.c,v 1.6 2004/02/04 17:40:01 joerg Exp $ 41 */ 42 43 #include <sys/param.h> 44 #include <sys/file.h> 45 #include <sys/mtio.h> 46 #include <sys/stat.h> 47 #include <sys/time.h> 48 49 #include <vfs/ufs/dinode.h> 50 #include <protocols/dumprestore.h> 51 52 #include <errno.h> 53 #include <paths.h> 54 #include <setjmp.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <unistd.h> 60 61 #include "restore.h" 62 #include "extern.h" 63 64 static long fssize = MAXBSIZE; 65 static int mt = -1; 66 static int pipein = 0; 67 static char *magtape; 68 static int blkcnt; 69 static int numtrec; 70 static char *tapebuf; 71 static union u_spcl endoftapemark; 72 static long blksread; /* blocks read since last header */ 73 static long tapeaddr = 0; /* current TP_BSIZE tape record */ 74 static long tapesread; 75 static jmp_buf restart; 76 static int gettingfile = 0; /* restart has a valid frame */ 77 static char *host = NULL; 78 79 static int ofile; 80 static char *map; 81 static char lnkbuf[MAXPATHLEN + 1]; 82 static int pathlen; 83 84 int oldinofmt; /* old inode format conversion required */ 85 int Bcvt; /* Swap Bytes (for CCI or sun) */ 86 static int Qcvt; /* Swap quads (for sun) */ 87 88 #define FLUSHTAPEBUF() blkcnt = ntrec + 1 89 90 static void accthdr(struct s_spcl *); 91 static int checksum(int *); 92 static void findinode(struct s_spcl *); 93 static void findtapeblksize(void); 94 static int gethead(struct s_spcl *); 95 static void readtape(char *); 96 static void setdumpnum(void); 97 static u_long swabl(u_long); 98 static u_char *swablong(u_char *, int); 99 static u_char *swabshort(u_char *, int); 100 static void terminateinput(void); 101 static void xtrfile(char *, long); 102 static void xtrlnkfile(char *, long); 103 static void xtrlnkskip(char *, long); 104 static void xtrmap(char *, long); 105 static void xtrmapskip(char *, long); 106 static void xtrskip(char *, long); 107 108 static int readmapflag; 109 110 /* 111 * Set up an input source 112 */ 113 void 114 setinput(char *source) 115 { 116 FLUSHTAPEBUF(); 117 if (bflag) 118 newtapebuf(ntrec); 119 else 120 newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC); 121 terminal = stdin; 122 123 #ifdef RRESTORE 124 if (strchr(source, ':')) { 125 host = source; 126 source = strchr(host, ':'); 127 *source++ = '\0'; 128 if (rmthost(host) == 0) 129 done(1); 130 } else 131 #endif 132 if (strcmp(source, "-") == 0) { 133 /* 134 * Since input is coming from a pipe we must establish 135 * our own connection to the terminal. 136 */ 137 terminal = fopen(_PATH_TTY, "r"); 138 if (terminal == NULL) { 139 (void)fprintf(stderr, "cannot open %s: %s\n", 140 _PATH_TTY, strerror(errno)); 141 terminal = fopen(_PATH_DEVNULL, "r"); 142 if (terminal == NULL) { 143 (void)fprintf(stderr, "cannot open %s: %s\n", 144 _PATH_DEVNULL, strerror(errno)); 145 done(1); 146 } 147 } 148 pipein++; 149 } 150 setuid(getuid()); /* no longer need or want root privileges */ 151 magtape = strdup(source); 152 if (magtape == NULL) { 153 fprintf(stderr, "Cannot allocate space for magtape buffer\n"); 154 done(1); 155 } 156 } 157 158 void 159 newtapebuf(long size) 160 { 161 static long tapebufsize = -1; 162 163 ntrec = size; 164 if (size <= tapebufsize) 165 return; 166 if (tapebuf != NULL) 167 free(tapebuf); 168 tapebuf = malloc(size * TP_BSIZE); 169 if (tapebuf == NULL) { 170 fprintf(stderr, "Cannot allocate space for tape buffer\n"); 171 done(1); 172 } 173 tapebufsize = size; 174 } 175 176 /* 177 * Verify that the tape drive can be accessed and 178 * that it actually is a dump tape. 179 */ 180 void 181 setup(void) 182 { 183 int i, j, *ip; 184 struct stat stbuf; 185 186 vprintf(stdout, "Verify tape and initialize maps\n"); 187 #ifdef RRESTORE 188 if (host) 189 mt = rmtopen(magtape, 0); 190 else 191 #endif 192 if (pipein) 193 mt = 0; 194 else 195 mt = open(magtape, O_RDONLY, 0); 196 if (mt < 0) { 197 fprintf(stderr, "%s: %s\n", magtape, strerror(errno)); 198 done(1); 199 } 200 volno = 1; 201 setdumpnum(); 202 FLUSHTAPEBUF(); 203 if (!pipein && !bflag) 204 findtapeblksize(); 205 if (gethead(&spcl) == FAIL) { 206 blkcnt--; /* push back this block */ 207 blksread--; 208 cvtflag++; 209 if (gethead(&spcl) == FAIL) { 210 fprintf(stderr, "Tape is not a dump tape\n"); 211 done(1); 212 } 213 fprintf(stderr, "Converting to new file system format.\n"); 214 } 215 if (pipein) { 216 endoftapemark.s_spcl.c_magic = cvtflag ? OFS_MAGIC : NFS_MAGIC; 217 endoftapemark.s_spcl.c_type = TS_END; 218 ip = (int *)&endoftapemark; 219 j = sizeof(union u_spcl) / sizeof(int); 220 i = 0; 221 do 222 i += *ip++; 223 while (--j); 224 endoftapemark.s_spcl.c_checksum = CHECKSUM - i; 225 } 226 if (vflag || command == 't') 227 printdumpinfo(); 228 dumptime = spcl.c_ddate; 229 dumpdate = spcl.c_date; 230 if (stat(".", &stbuf) < 0) { 231 fprintf(stderr, "cannot stat .: %s\n", strerror(errno)); 232 done(1); 233 } 234 if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE ) 235 fssize = TP_BSIZE; 236 if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE) 237 fssize = stbuf.st_blksize; 238 if (((fssize - 1) & fssize) != 0) { 239 fprintf(stderr, "bad block size %ld\n", fssize); 240 done(1); 241 } 242 if (spcl.c_volume != 1) { 243 fprintf(stderr, "Tape is not volume 1 of the dump\n"); 244 done(1); 245 } 246 if (gethead(&spcl) == FAIL) { 247 dprintf(stdout, "header read failed at %ld blocks\n", blksread); 248 panic("no header after volume mark!\n"); 249 } 250 findinode(&spcl); 251 if (spcl.c_type != TS_CLRI) { 252 fprintf(stderr, "Cannot find file removal list\n"); 253 done(1); 254 } 255 maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1; 256 dprintf(stdout, "maxino = %d\n", maxino); 257 map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY)); 258 if (map == NULL) 259 panic("no memory for active inode map\n"); 260 usedinomap = map; 261 curfile.action = USING; 262 getfile(xtrmap, xtrmapskip); 263 if (spcl.c_type != TS_BITS) { 264 fprintf(stderr, "Cannot find file dump list\n"); 265 done(1); 266 } 267 map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY)); 268 if (map == (char *)NULL) 269 panic("no memory for file dump list\n"); 270 dumpmap = map; 271 curfile.action = USING; 272 getfile(xtrmap, xtrmapskip); 273 /* 274 * If there may be whiteout entries on the tape, pretend that the 275 * whiteout inode exists, so that the whiteout entries can be 276 * extracted. 277 */ 278 if (oldinofmt == 0) 279 SETINO(WINO, dumpmap); 280 /* 'r' restores don't call getvol() for tape 1, so mark it as read. */ 281 if (command == 'r') 282 tapesread = 1; 283 } 284 285 /* 286 * Prompt user to load a new dump volume. 287 * "Nextvol" is the next suggested volume to use. 288 * This suggested volume is enforced when doing full 289 * or incremental restores, but can be overridden by 290 * the user when only extracting a subset of the files. 291 */ 292 void 293 getvol(long nextvol) 294 { 295 long newvol = 0, prevtapea, savecnt, i; 296 union u_spcl tmpspcl; 297 # define tmpbuf tmpspcl.s_spcl 298 char buf[TP_BSIZE]; 299 300 if (nextvol == 1) { 301 tapesread = 0; 302 gettingfile = 0; 303 } 304 prevtapea = tapeaddr; 305 savecnt = blksread; 306 if (pipein) { 307 if (nextvol != 1) { 308 panic("Changing volumes on pipe input?\n"); 309 /* Avoid looping if we couldn't ask the user. */ 310 if (yflag || ferror(terminal) || feof(terminal)) 311 done(1); 312 } 313 if (volno == 1) 314 return; 315 goto gethdr; 316 } 317 again: 318 if (pipein) 319 done(1); /* pipes do not get a second chance */ 320 if (command == 'R' || command == 'r' || curfile.action != SKIP) 321 newvol = nextvol; 322 else 323 newvol = 0; 324 while (newvol <= 0) { 325 if (tapesread == 0) { 326 fprintf(stderr, "%s%s%s%s%s%s%s", 327 "You have not read any tapes yet.\n", 328 "If you are extracting just a few files,", 329 " start with the last volume\n", 330 "and work towards the first; restore", 331 " can quickly skip tapes that\n", 332 "have no further files to extract.", 333 " Otherwise, begin with volume 1.\n"); 334 } else { 335 fprintf(stderr, "You have read volumes"); 336 strcpy(buf, ": "); 337 for (i = 0; i < 32; i++) 338 if (tapesread & (1 << i)) { 339 fprintf(stderr, "%s%ld", buf, i + 1); 340 strcpy(buf, ", "); 341 } 342 fprintf(stderr, "\n"); 343 } 344 do { 345 fprintf(stderr, "Specify next volume #: "); 346 (void) fflush(stderr); 347 if (fgets(buf, BUFSIZ, terminal) == NULL) 348 done(1); 349 } while (buf[0] == '\n'); 350 newvol = atoi(buf); 351 if (newvol <= 0) { 352 fprintf(stderr, 353 "Volume numbers are positive numerics\n"); 354 } 355 } 356 if (newvol == volno) { 357 tapesread |= 1 << (volno - 1); 358 return; 359 } 360 closemt(); 361 fprintf(stderr, "Mount tape volume %ld\n", newvol); 362 fprintf(stderr, "Enter ``none'' if there are no more tapes\n"); 363 fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape); 364 (void) fflush(stderr); 365 if (fgets(buf, BUFSIZ, terminal) == NULL) 366 done(1); 367 if (!strcmp(buf, "none\n")) { 368 terminateinput(); 369 return; 370 } 371 if (buf[0] != '\n') { 372 (void) strcpy(magtape, buf); 373 magtape[strlen(magtape) - 1] = '\0'; 374 } 375 #ifdef RRESTORE 376 if (host) 377 mt = rmtopen(magtape, 0); 378 else 379 #endif 380 mt = open(magtape, O_RDONLY, 0); 381 382 if (mt == -1) { 383 fprintf(stderr, "Cannot open %s\n", magtape); 384 volno = -1; 385 goto again; 386 } 387 gethdr: 388 volno = newvol; 389 setdumpnum(); 390 FLUSHTAPEBUF(); 391 if (gethead(&tmpbuf) == FAIL) { 392 dprintf(stdout, "header read failed at %ld blocks\n", blksread); 393 fprintf(stderr, "tape is not dump tape\n"); 394 volno = 0; 395 goto again; 396 } 397 if (tmpbuf.c_volume != volno) { 398 fprintf(stderr, "Wrong volume (%ld)\n", (long)tmpbuf.c_volume); 399 volno = 0; 400 goto again; 401 } 402 if (tmpbuf.c_date != dumpdate || tmpbuf.c_ddate != dumptime) { 403 fprintf(stderr, "Wrong dump date\n\tgot: %s", 404 ctime(&tmpbuf.c_date)); 405 fprintf(stderr, "\twanted: %s", ctime(&dumpdate)); 406 volno = 0; 407 goto again; 408 } 409 tapesread |= 1 << (volno - 1); 410 blksread = savecnt; 411 /* 412 * If continuing from the previous volume, skip over any 413 * blocks read already at the end of the previous volume. 414 * 415 * If coming to this volume at random, skip to the beginning 416 * of the next record. 417 */ 418 dprintf(stdout, "last rec %ld, tape starts with %ld\n", prevtapea, 419 (long)tmpbuf.c_tapea); 420 if (tmpbuf.c_type == TS_TAPE && (tmpbuf.c_flags & DR_NEWHEADER)) { 421 if (curfile.action != USING) { 422 /* 423 * XXX Dump incorrectly sets c_count to 1 in the 424 * volume header of the first tape, so ignore 425 * c_count when volno == 1. 426 */ 427 if (volno != 1) 428 for (i = tmpbuf.c_count; i > 0; i--) 429 readtape(buf); 430 } else if (tmpbuf.c_tapea <= prevtapea) { 431 /* 432 * Normally the value of c_tapea in the volume 433 * header is the record number of the header itself. 434 * However in the volume header following an EOT- 435 * terminated tape, it is the record number of the 436 * first continuation data block (dump bug?). 437 * 438 * The next record we want is `prevtapea + 1'. 439 */ 440 i = prevtapea + 1 - tmpbuf.c_tapea; 441 dprintf(stderr, "Skipping %ld duplicate record%s.\n", 442 i, i > 1 ? "s" : ""); 443 while (--i >= 0) 444 readtape(buf); 445 } 446 } 447 if (curfile.action == USING) { 448 if (volno == 1) 449 panic("active file into volume 1\n"); 450 return; 451 } 452 (void) gethead(&spcl); 453 findinode(&spcl); 454 if (gettingfile) { 455 gettingfile = 0; 456 longjmp(restart, 1); 457 } 458 } 459 460 /* 461 * Handle unexpected EOF. 462 */ 463 static void 464 terminateinput(void) 465 { 466 467 if (gettingfile && curfile.action == USING) { 468 printf("Warning: %s %s\n", 469 "End-of-input encountered while extracting", curfile.name); 470 } 471 curfile.name = "<name unknown>"; 472 curfile.action = UNKNOWN; 473 curfile.dip = NULL; 474 curfile.ino = maxino; 475 if (gettingfile) { 476 gettingfile = 0; 477 longjmp(restart, 1); 478 } 479 } 480 481 /* 482 * handle multiple dumps per tape by skipping forward to the 483 * appropriate one. 484 */ 485 static void 486 setdumpnum(void) 487 { 488 struct mtop tcom; 489 490 if (dumpnum == 1 || volno != 1) 491 return; 492 if (pipein) { 493 fprintf(stderr, "Cannot have multiple dumps on pipe input\n"); 494 done(1); 495 } 496 tcom.mt_op = MTFSF; 497 tcom.mt_count = dumpnum - 1; 498 #ifdef RRESTORE 499 if (host) 500 rmtioctl(MTFSF, dumpnum - 1); 501 else 502 #endif 503 if (ioctl(mt, MTIOCTOP, (char *)&tcom) < 0) 504 fprintf(stderr, "ioctl MTFSF: %s\n", strerror(errno)); 505 } 506 507 void 508 printdumpinfo(void) 509 { 510 fprintf(stdout, "Dump date: %s", ctime(&spcl.c_date)); 511 fprintf(stdout, "Dumped from: %s", 512 (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&spcl.c_ddate)); 513 if (spcl.c_host[0] == '\0') 514 return; 515 fprintf(stderr, "Level %ld dump of %s on %s:%s\n", 516 (long)spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev); 517 fprintf(stderr, "Label: %s\n", spcl.c_label); 518 } 519 520 int 521 extractfile(char *name) 522 { 523 int flags; 524 uid_t uid; 525 gid_t gid; 526 mode_t mode; 527 struct timeval timep[2]; 528 struct entry *ep; 529 530 curfile.name = name; 531 curfile.action = USING; 532 timep[0].tv_sec = curfile.dip->di_atime; 533 timep[0].tv_usec = curfile.dip->di_atimensec / 1000; 534 timep[1].tv_sec = curfile.dip->di_mtime; 535 timep[1].tv_usec = curfile.dip->di_mtimensec / 1000; 536 uid = curfile.dip->di_uid; 537 gid = curfile.dip->di_gid; 538 mode = curfile.dip->di_mode; 539 flags = curfile.dip->di_flags; 540 switch (mode & IFMT) { 541 542 default: 543 fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode); 544 skipfile(); 545 return (FAIL); 546 547 case IFSOCK: 548 vprintf(stdout, "skipped socket %s\n", name); 549 skipfile(); 550 return (GOOD); 551 552 case IFDIR: 553 if (mflag) { 554 ep = lookupname(name); 555 if (ep == NULL || ep->e_flags & EXTRACT) 556 panic("unextracted directory %s\n", name); 557 skipfile(); 558 return (GOOD); 559 } 560 vprintf(stdout, "extract file %s\n", name); 561 return (genliteraldir(name, curfile.ino)); 562 563 case IFLNK: 564 lnkbuf[0] = '\0'; 565 pathlen = 0; 566 getfile(xtrlnkfile, xtrlnkskip); 567 if (pathlen == 0) { 568 vprintf(stdout, 569 "%s: zero length symbolic link (ignored)\n", name); 570 return (GOOD); 571 } 572 if (linkit(lnkbuf, name, SYMLINK) == GOOD) { 573 (void) lchown(name, uid, gid); 574 (void) lchmod(name, mode); 575 (void) lutimes(name, timep); 576 return (GOOD); 577 } 578 return (FAIL); 579 580 case IFIFO: 581 vprintf(stdout, "extract fifo %s\n", name); 582 if (Nflag) { 583 skipfile(); 584 return (GOOD); 585 } 586 if (uflag && !Nflag) 587 (void)unlink(name); 588 if (mkfifo(name, mode) < 0) { 589 fprintf(stderr, "%s: cannot create fifo: %s\n", 590 name, strerror(errno)); 591 skipfile(); 592 return (FAIL); 593 } 594 (void) chown(name, uid, gid); 595 (void) chmod(name, mode); 596 (void) utimes(name, timep); 597 (void) chflags(name, flags); 598 skipfile(); 599 return (GOOD); 600 601 case IFCHR: 602 case IFBLK: 603 vprintf(stdout, "extract special file %s\n", name); 604 if (Nflag) { 605 skipfile(); 606 return (GOOD); 607 } 608 if (uflag) 609 (void)unlink(name); 610 if (mknod(name, mode, (int)curfile.dip->di_rdev) < 0) { 611 fprintf(stderr, "%s: cannot create special file: %s\n", 612 name, strerror(errno)); 613 skipfile(); 614 return (FAIL); 615 } 616 (void) chown(name, uid, gid); 617 (void) chmod(name, mode); 618 (void) utimes(name, timep); 619 (void) chflags(name, flags); 620 skipfile(); 621 return (GOOD); 622 623 case IFREG: 624 vprintf(stdout, "extract file %s\n", name); 625 if (Nflag) { 626 skipfile(); 627 return (GOOD); 628 } 629 if (uflag) 630 (void)unlink(name); 631 if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC, 632 0666)) < 0) { 633 fprintf(stderr, "%s: cannot create file: %s\n", 634 name, strerror(errno)); 635 skipfile(); 636 return (FAIL); 637 } 638 (void) fchown(ofile, uid, gid); 639 (void) fchmod(ofile, mode); 640 getfile(xtrfile, xtrskip); 641 (void) close(ofile); 642 utimes(name, timep); 643 (void) chflags(name, flags); 644 return (GOOD); 645 } 646 /* NOTREACHED */ 647 } 648 649 /* 650 * skip over bit maps on the tape 651 */ 652 void 653 skipmaps(void) 654 { 655 656 while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI) 657 skipfile(); 658 } 659 660 /* 661 * skip over a file on the tape 662 */ 663 void 664 skipfile(void) 665 { 666 667 curfile.action = SKIP; 668 getfile(xtrnull, xtrnull); 669 } 670 671 /* 672 * Extract a file from the tape. 673 * When an allocated block is found it is passed to the fill function; 674 * when an unallocated block (hole) is found, a zeroed buffer is passed 675 * to the skip function. 676 */ 677 void 678 getfile(void (*fill) (char *, long), void (*skip) (char *, long)) 679 { 680 register int i; 681 int curblk = 0; 682 quad_t size = spcl.c_dinode.di_size; 683 static char clearedbuf[MAXBSIZE]; 684 char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE]; 685 char junk[TP_BSIZE]; 686 687 if (spcl.c_type == TS_END) 688 panic("ran off end of tape\n"); 689 if (spcl.c_magic != NFS_MAGIC) 690 panic("not at beginning of a file\n"); 691 if (!gettingfile && setjmp(restart) != 0) 692 return; 693 gettingfile++; 694 loop: 695 for (i = 0; i < spcl.c_count; i++) { 696 if (readmapflag || spcl.c_addr[i]) { 697 readtape(&buf[curblk++][0]); 698 if (curblk == fssize / TP_BSIZE) { 699 (*fill)((char *)buf, (long)(size > TP_BSIZE ? 700 fssize : (curblk - 1) * TP_BSIZE + size)); 701 curblk = 0; 702 } 703 } else { 704 if (curblk > 0) { 705 (*fill)((char *)buf, (long)(size > TP_BSIZE ? 706 curblk * TP_BSIZE : 707 (curblk - 1) * TP_BSIZE + size)); 708 curblk = 0; 709 } 710 (*skip)(clearedbuf, (long)(size > TP_BSIZE ? 711 TP_BSIZE : size)); 712 } 713 if ((size -= TP_BSIZE) <= 0) { 714 for (i++; i < spcl.c_count; i++) 715 if (readmapflag || spcl.c_addr[i]) 716 readtape(junk); 717 break; 718 } 719 } 720 if (gethead(&spcl) == GOOD && size > 0) { 721 if (spcl.c_type == TS_ADDR) 722 goto loop; 723 dprintf(stdout, 724 "Missing address (header) block for %s at %ld blocks\n", 725 curfile.name, blksread); 726 } 727 if (curblk > 0) 728 (*fill)((char *)buf, (long)((curblk * TP_BSIZE) + size)); 729 findinode(&spcl); 730 gettingfile = 0; 731 } 732 733 /* 734 * Write out the next block of a file. 735 */ 736 static void 737 xtrfile(char *buf, long size) 738 { 739 740 if (Nflag) 741 return; 742 if (write(ofile, buf, (int) size) == -1) { 743 fprintf(stderr, 744 "write error extracting inode %d, name %s\nwrite: %s\n", 745 curfile.ino, curfile.name, strerror(errno)); 746 } 747 } 748 749 /* 750 * Skip over a hole in a file. 751 */ 752 /* ARGSUSED */ 753 static void 754 xtrskip(char *buf, long size) 755 { 756 757 if (lseek(ofile, size, SEEK_CUR) == -1) { 758 fprintf(stderr, 759 "seek error extracting inode %d, name %s\nlseek: %s\n", 760 curfile.ino, curfile.name, strerror(errno)); 761 done(1); 762 } 763 } 764 765 /* 766 * Collect the next block of a symbolic link. 767 */ 768 static void 769 xtrlnkfile(char *buf, long size) 770 { 771 772 pathlen += size; 773 if (pathlen > MAXPATHLEN) { 774 fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n", 775 curfile.name, lnkbuf, buf, pathlen); 776 done(1); 777 } 778 (void) strcat(lnkbuf, buf); 779 } 780 781 /* 782 * Skip over a hole in a symbolic link (should never happen). 783 */ 784 /* ARGSUSED */ 785 static void 786 xtrlnkskip(char *buf, long size) 787 { 788 789 fprintf(stderr, "unallocated block in symbolic link %s\n", 790 curfile.name); 791 done(1); 792 } 793 794 /* 795 * Collect the next block of a bit map. 796 */ 797 static void 798 xtrmap(char *buf, long size) 799 { 800 801 memmove(map, buf, size); 802 map += size; 803 } 804 805 /* 806 * Skip over a hole in a bit map (should never happen). 807 */ 808 /* ARGSUSED */ 809 static void 810 xtrmapskip(char *buf, long size) 811 { 812 813 panic("hole in map\n"); 814 map += size; 815 } 816 817 /* 818 * Noop, when an extraction function is not needed. 819 */ 820 /* ARGSUSED */ 821 void 822 xtrnull(char *buf, long size) 823 { 824 825 return; 826 } 827 828 /* 829 * Read TP_BSIZE blocks from the input. 830 * Handle read errors, and end of media. 831 */ 832 static void 833 readtape(char *buf) 834 { 835 long rd, newvol, i; 836 int cnt, seek_failed; 837 838 if (blkcnt < numtrec) { 839 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE); 840 blksread++; 841 tapeaddr++; 842 return; 843 } 844 for (i = 0; i < ntrec; i++) 845 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0; 846 if (numtrec == 0) 847 numtrec = ntrec; 848 cnt = ntrec * TP_BSIZE; 849 rd = 0; 850 getmore: 851 #ifdef RRESTORE 852 if (host) 853 i = rmtread(&tapebuf[rd], cnt); 854 else 855 #endif 856 i = read(mt, &tapebuf[rd], cnt); 857 /* 858 * Check for mid-tape short read error. 859 * If found, skip rest of buffer and start with the next. 860 */ 861 if (!pipein && numtrec < ntrec && i > 0) { 862 dprintf(stdout, "mid-media short read error.\n"); 863 numtrec = ntrec; 864 } 865 /* 866 * Handle partial block read. 867 */ 868 if (pipein && i == 0 && rd > 0) 869 i = rd; 870 else if (i > 0 && i != ntrec * TP_BSIZE) { 871 if (pipein) { 872 rd += i; 873 cnt -= i; 874 if (cnt > 0) 875 goto getmore; 876 i = rd; 877 } else { 878 /* 879 * Short read. Process the blocks read. 880 */ 881 if (i % TP_BSIZE != 0) 882 vprintf(stdout, 883 "partial block read: %ld should be %ld\n", 884 i, ntrec * TP_BSIZE); 885 numtrec = i / TP_BSIZE; 886 } 887 } 888 /* 889 * Handle read error. 890 */ 891 if (i < 0) { 892 fprintf(stderr, "Tape read error while "); 893 switch (curfile.action) { 894 default: 895 fprintf(stderr, "trying to set up tape\n"); 896 break; 897 case UNKNOWN: 898 fprintf(stderr, "trying to resynchronize\n"); 899 break; 900 case USING: 901 fprintf(stderr, "restoring %s\n", curfile.name); 902 break; 903 case SKIP: 904 fprintf(stderr, "skipping over inode %d\n", 905 curfile.ino); 906 break; 907 } 908 if (!yflag && !reply("continue")) 909 done(1); 910 i = ntrec * TP_BSIZE; 911 memset(tapebuf, 0, i); 912 #ifdef RRESTORE 913 if (host) 914 seek_failed = (rmtseek(i, 1) < 0); 915 else 916 #endif 917 seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1); 918 919 if (seek_failed) { 920 fprintf(stderr, 921 "continuation failed: %s\n", strerror(errno)); 922 done(1); 923 } 924 } 925 /* 926 * Handle end of tape. 927 */ 928 if (i == 0) { 929 vprintf(stdout, "End-of-tape encountered\n"); 930 if (!pipein) { 931 newvol = volno + 1; 932 volno = 0; 933 numtrec = 0; 934 getvol(newvol); 935 readtape(buf); 936 return; 937 } 938 if (rd % TP_BSIZE != 0) 939 panic("partial block read: %d should be %d\n", 940 rd, ntrec * TP_BSIZE); 941 terminateinput(); 942 memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE); 943 } 944 blkcnt = 0; 945 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE); 946 blksread++; 947 tapeaddr++; 948 } 949 950 static void 951 findtapeblksize(void) 952 { 953 register long i; 954 955 for (i = 0; i < ntrec; i++) 956 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0; 957 blkcnt = 0; 958 #ifdef RRESTORE 959 if (host) 960 i = rmtread(tapebuf, ntrec * TP_BSIZE); 961 else 962 #endif 963 i = read(mt, tapebuf, ntrec * TP_BSIZE); 964 965 if (i <= 0) { 966 fprintf(stderr, "tape read error: %s\n", strerror(errno)); 967 done(1); 968 } 969 if (i % TP_BSIZE != 0) { 970 fprintf(stderr, "Tape block size (%ld) %s (%d)\n", 971 i, "is not a multiple of dump block size", TP_BSIZE); 972 done(1); 973 } 974 ntrec = i / TP_BSIZE; 975 numtrec = ntrec; 976 vprintf(stdout, "Tape block size is %ld\n", ntrec); 977 } 978 979 void 980 closemt(void) 981 { 982 983 if (mt < 0) 984 return; 985 #ifdef RRESTORE 986 if (host) 987 rmtclose(); 988 else 989 #endif 990 (void) close(mt); 991 } 992 993 /* 994 * Read the next block from the tape. 995 * Check to see if it is one of several vintage headers. 996 * If it is an old style header, convert it to a new style header. 997 * If it is not any valid header, return an error. 998 */ 999 static int 1000 gethead(struct s_spcl *buf) 1001 { 1002 long i; 1003 union { 1004 quad_t qval; 1005 int32_t val[2]; 1006 } qcvt; 1007 union u_ospcl { 1008 char dummy[TP_BSIZE]; 1009 struct s_ospcl { 1010 int32_t c_type; 1011 int32_t c_date; 1012 int32_t c_ddate; 1013 int32_t c_volume; 1014 int32_t c_tapea; 1015 u_short c_inumber; 1016 int32_t c_magic; 1017 int32_t c_checksum; 1018 struct odinode { 1019 unsigned short odi_mode; 1020 u_short odi_nlink; 1021 u_short odi_uid; 1022 u_short odi_gid; 1023 int32_t odi_size; 1024 int32_t odi_rdev; 1025 char odi_addr[36]; 1026 int32_t odi_atime; 1027 int32_t odi_mtime; 1028 int32_t odi_ctime; 1029 } c_dinode; 1030 int32_t c_count; 1031 char c_addr[256]; 1032 } s_ospcl; 1033 } u_ospcl; 1034 1035 if (!cvtflag) { 1036 readtape((char *)buf); 1037 if (buf->c_magic != NFS_MAGIC) { 1038 if (swabl(buf->c_magic) != NFS_MAGIC) 1039 return (FAIL); 1040 if (!Bcvt) { 1041 vprintf(stdout, "Note: Doing Byte swapping\n"); 1042 Bcvt = 1; 1043 } 1044 } 1045 if (checksum((int *)buf) == FAIL) 1046 return (FAIL); 1047 if (Bcvt) { 1048 swabst((u_char *)"8l4s31l", (u_char *)buf); 1049 swabst((u_char *)"l",(u_char *) &buf->c_level); 1050 swabst((u_char *)"2l",(u_char *) &buf->c_flags); 1051 } 1052 goto good; 1053 } 1054 readtape((char *)(&u_ospcl.s_ospcl)); 1055 memset(buf, 0, (long)TP_BSIZE); 1056 buf->c_type = u_ospcl.s_ospcl.c_type; 1057 buf->c_date = u_ospcl.s_ospcl.c_date; 1058 buf->c_ddate = u_ospcl.s_ospcl.c_ddate; 1059 buf->c_volume = u_ospcl.s_ospcl.c_volume; 1060 buf->c_tapea = u_ospcl.s_ospcl.c_tapea; 1061 buf->c_inumber = u_ospcl.s_ospcl.c_inumber; 1062 buf->c_checksum = u_ospcl.s_ospcl.c_checksum; 1063 buf->c_magic = u_ospcl.s_ospcl.c_magic; 1064 buf->c_dinode.di_mode = u_ospcl.s_ospcl.c_dinode.odi_mode; 1065 buf->c_dinode.di_nlink = u_ospcl.s_ospcl.c_dinode.odi_nlink; 1066 buf->c_dinode.di_uid = u_ospcl.s_ospcl.c_dinode.odi_uid; 1067 buf->c_dinode.di_gid = u_ospcl.s_ospcl.c_dinode.odi_gid; 1068 buf->c_dinode.di_size = u_ospcl.s_ospcl.c_dinode.odi_size; 1069 buf->c_dinode.di_rdev = u_ospcl.s_ospcl.c_dinode.odi_rdev; 1070 buf->c_dinode.di_atime = u_ospcl.s_ospcl.c_dinode.odi_atime; 1071 buf->c_dinode.di_mtime = u_ospcl.s_ospcl.c_dinode.odi_mtime; 1072 buf->c_dinode.di_ctime = u_ospcl.s_ospcl.c_dinode.odi_ctime; 1073 buf->c_count = u_ospcl.s_ospcl.c_count; 1074 memmove(buf->c_addr, u_ospcl.s_ospcl.c_addr, (long)256); 1075 if (u_ospcl.s_ospcl.c_magic != OFS_MAGIC || 1076 checksum((int *)(&u_ospcl.s_ospcl)) == FAIL) 1077 return(FAIL); 1078 buf->c_magic = NFS_MAGIC; 1079 1080 good: 1081 if ((buf->c_dinode.di_size == 0 || buf->c_dinode.di_size > 0xfffffff) && 1082 (buf->c_dinode.di_mode & IFMT) == IFDIR && Qcvt == 0) { 1083 qcvt.qval = buf->c_dinode.di_size; 1084 if (qcvt.val[0] || qcvt.val[1]) { 1085 printf("Note: Doing Quad swapping\n"); 1086 Qcvt = 1; 1087 } 1088 } 1089 if (Qcvt) { 1090 qcvt.qval = buf->c_dinode.di_size; 1091 i = qcvt.val[1]; 1092 qcvt.val[1] = qcvt.val[0]; 1093 qcvt.val[0] = i; 1094 buf->c_dinode.di_size = qcvt.qval; 1095 } 1096 readmapflag = 0; 1097 1098 switch (buf->c_type) { 1099 1100 case TS_CLRI: 1101 case TS_BITS: 1102 /* 1103 * Have to patch up missing information in bit map headers 1104 */ 1105 buf->c_inumber = 0; 1106 buf->c_dinode.di_size = buf->c_count * TP_BSIZE; 1107 if (buf->c_count > TP_NINDIR) 1108 readmapflag = 1; 1109 else 1110 for (i = 0; i < buf->c_count; i++) 1111 buf->c_addr[i]++; 1112 break; 1113 1114 case TS_TAPE: 1115 if ((buf->c_flags & DR_NEWINODEFMT) == 0) 1116 oldinofmt = 1; 1117 /* fall through */ 1118 case TS_END: 1119 buf->c_inumber = 0; 1120 break; 1121 1122 case TS_INODE: 1123 case TS_ADDR: 1124 break; 1125 1126 default: 1127 panic("gethead: unknown inode type %d\n", buf->c_type); 1128 break; 1129 } 1130 /* 1131 * If we are restoring a filesystem with old format inodes, 1132 * copy the uid/gid to the new location. 1133 */ 1134 if (oldinofmt) { 1135 buf->c_dinode.di_uid = buf->c_dinode.di_ouid; 1136 buf->c_dinode.di_gid = buf->c_dinode.di_ogid; 1137 } 1138 tapeaddr = buf->c_tapea; 1139 if (dflag) 1140 accthdr(buf); 1141 return(GOOD); 1142 } 1143 1144 /* 1145 * Check that a header is where it belongs and predict the next header 1146 */ 1147 static void 1148 accthdr(struct s_spcl *header) 1149 { 1150 static ino_t previno = 0x7fffffff; 1151 static int prevtype; 1152 static long predict; 1153 long blks, i; 1154 1155 if (header->c_type == TS_TAPE) { 1156 fprintf(stderr, "Volume header (%s inode format) ", 1157 oldinofmt ? "old" : "new"); 1158 if (header->c_firstrec) 1159 fprintf(stderr, "begins with record %ld", 1160 (long)header->c_firstrec); 1161 fprintf(stderr, "\n"); 1162 previno = 0x7fffffff; 1163 return; 1164 } 1165 if (previno == 0x7fffffff) 1166 goto newcalc; 1167 switch (prevtype) { 1168 case TS_BITS: 1169 fprintf(stderr, "Dumped inodes map header"); 1170 break; 1171 case TS_CLRI: 1172 fprintf(stderr, "Used inodes map header"); 1173 break; 1174 case TS_INODE: 1175 fprintf(stderr, "File header, ino %d", previno); 1176 break; 1177 case TS_ADDR: 1178 fprintf(stderr, "File continuation header, ino %d", previno); 1179 break; 1180 case TS_END: 1181 fprintf(stderr, "End of tape header"); 1182 break; 1183 } 1184 if (predict != blksread - 1) 1185 fprintf(stderr, "; predicted %ld blocks, got %ld blocks", 1186 predict, blksread - 1); 1187 fprintf(stderr, "\n"); 1188 newcalc: 1189 blks = 0; 1190 if (header->c_type != TS_END) 1191 for (i = 0; i < header->c_count; i++) 1192 if (readmapflag || header->c_addr[i] != 0) 1193 blks++; 1194 predict = blks; 1195 blksread = 0; 1196 prevtype = header->c_type; 1197 previno = header->c_inumber; 1198 } 1199 1200 /* 1201 * Find an inode header. 1202 * Complain if had to skip. 1203 */ 1204 static void 1205 findinode(struct s_spcl *header) 1206 { 1207 static long skipcnt = 0; 1208 long i; 1209 char buf[TP_BSIZE]; 1210 int htype; 1211 1212 curfile.name = "<name unknown>"; 1213 curfile.action = UNKNOWN; 1214 curfile.dip = NULL; 1215 curfile.ino = 0; 1216 do { 1217 if (header->c_magic != NFS_MAGIC) { 1218 skipcnt++; 1219 while (gethead(header) == FAIL || 1220 header->c_date != dumpdate) 1221 skipcnt++; 1222 } 1223 htype = header->c_type; 1224 switch (htype) { 1225 1226 case TS_ADDR: 1227 /* 1228 * Skip up to the beginning of the next record 1229 */ 1230 for (i = 0; i < header->c_count; i++) 1231 if (header->c_addr[i]) 1232 readtape(buf); 1233 while (gethead(header) == FAIL || 1234 header->c_date != dumpdate) 1235 skipcnt++; 1236 break; 1237 1238 case TS_INODE: 1239 curfile.dip = &header->c_dinode; 1240 curfile.ino = header->c_inumber; 1241 break; 1242 1243 case TS_END: 1244 /* If we missed some tapes, get another volume. */ 1245 if (tapesread & (tapesread + 1)) { 1246 getvol(0); 1247 continue; 1248 } 1249 curfile.ino = maxino; 1250 break; 1251 1252 case TS_CLRI: 1253 curfile.name = "<file removal list>"; 1254 break; 1255 1256 case TS_BITS: 1257 curfile.name = "<file dump list>"; 1258 break; 1259 1260 case TS_TAPE: 1261 panic("unexpected tape header\n"); 1262 /* NOTREACHED */ 1263 1264 default: 1265 panic("unknown tape header type %d\n", spcl.c_type); 1266 /* NOTREACHED */ 1267 1268 } 1269 } while (htype == TS_ADDR); 1270 if (skipcnt > 0) 1271 fprintf(stderr, "resync restore, skipped %ld blocks\n", 1272 skipcnt); 1273 skipcnt = 0; 1274 } 1275 1276 static int 1277 checksum(register int *buf) 1278 { 1279 register int i, j; 1280 1281 j = sizeof(union u_spcl) / sizeof(int); 1282 i = 0; 1283 if(!Bcvt) { 1284 do 1285 i += *buf++; 1286 while (--j); 1287 } else { 1288 /* What happens if we want to read restore tapes 1289 for a 16bit int machine??? */ 1290 do 1291 i += swabl(*buf++); 1292 while (--j); 1293 } 1294 1295 if (i != CHECKSUM) { 1296 fprintf(stderr, "Checksum error %o, inode %d file %s\n", i, 1297 curfile.ino, curfile.name); 1298 return(FAIL); 1299 } 1300 return(GOOD); 1301 } 1302 1303 #ifdef RRESTORE 1304 #include <stdarg.h> 1305 1306 void 1307 msg(const char *fmt, ...) 1308 { 1309 va_list ap; 1310 va_start(ap, fmt); 1311 (void)vfprintf(stderr, fmt, ap); 1312 va_end(ap); 1313 } 1314 #endif /* RRESTORE */ 1315 1316 static u_char * 1317 swabshort(register u_char *sp, register int n) 1318 { 1319 char c; 1320 1321 while (--n >= 0) { 1322 c = sp[0]; sp[0] = sp[1]; sp[1] = c; 1323 sp += 2; 1324 } 1325 return (sp); 1326 } 1327 1328 static u_char * 1329 swablong(register u_char *sp, register int n) 1330 { 1331 char c; 1332 1333 while (--n >= 0) { 1334 c = sp[0]; sp[0] = sp[3]; sp[3] = c; 1335 c = sp[2]; sp[2] = sp[1]; sp[1] = c; 1336 sp += 4; 1337 } 1338 return (sp); 1339 } 1340 1341 void 1342 swabst(register u_char *cp, register u_char *sp) 1343 { 1344 int n = 0; 1345 1346 while (*cp) { 1347 switch (*cp) { 1348 case '0': case '1': case '2': case '3': case '4': 1349 case '5': case '6': case '7': case '8': case '9': 1350 n = (n * 10) + (*cp++ - '0'); 1351 continue; 1352 1353 case 's': case 'w': case 'h': 1354 if (n == 0) 1355 n = 1; 1356 sp = swabshort(sp, n); 1357 break; 1358 1359 case 'l': 1360 if (n == 0) 1361 n = 1; 1362 sp = swablong(sp, n); 1363 break; 1364 1365 default: /* Any other character, like 'b' counts as byte. */ 1366 if (n == 0) 1367 n = 1; 1368 sp += n; 1369 break; 1370 } 1371 cp++; 1372 n = 0; 1373 } 1374 } 1375 1376 static u_long 1377 swabl(u_long x) 1378 { 1379 swabst((u_char *)"l", (u_char *)&x); 1380 return (x); 1381 } 1382