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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)tape.c 8.9 (Berkeley) 5/1/95 35 * $FreeBSD: src/sbin/restore/tape.c,v 1.16.2.8 2002/06/30 22:57:52 iedowse Exp $ 36 * $DragonFly: src/sbin/restore/tape.c,v 1.9 2005/11/06 12:49:25 swildner Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/file.h> 41 #include <sys/mtio.h> 42 #include <sys/stat.h> 43 #include <sys/time.h> 44 45 #include <vfs/ufs/dinode.h> 46 #include <protocols/dumprestore.h> 47 48 #include <errno.h> 49 #include <paths.h> 50 #include <setjmp.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <time.h> 55 #include <unistd.h> 56 57 #include "restore.h" 58 #include "extern.h" 59 60 static long fssize = MAXBSIZE; 61 static int mt = -1; 62 static int pipein = 0; 63 static char *magtape; 64 static int blkcnt; 65 static int numtrec; 66 static char *tapebuf; 67 static union u_spcl endoftapemark; 68 static long blksread; /* blocks read since last header */ 69 static long tapeaddr = 0; /* current TP_BSIZE tape record */ 70 static long tapesread; 71 static jmp_buf restart; 72 static int gettingfile = 0; /* restart has a valid frame */ 73 static char *host = NULL; 74 75 static int ofile; 76 static char *map; 77 static char lnkbuf[MAXPATHLEN + 1]; 78 static int pathlen; 79 80 int oldinofmt; /* old inode format conversion required */ 81 int Bcvt; /* Swap Bytes (for CCI or sun) */ 82 static int Qcvt; /* Swap quads (for sun) */ 83 84 #define FLUSHTAPEBUF() blkcnt = ntrec + 1 85 86 static void accthdr(struct s_spcl *); 87 static int checksum(int *); 88 static void findinode(struct s_spcl *); 89 static void findtapeblksize(void); 90 static int gethead(struct s_spcl *); 91 static void readtape(char *); 92 static void setdumpnum(void); 93 static u_long swabl(u_long); 94 static u_char *swablong(u_char *, int); 95 static u_char *swabshort(u_char *, int); 96 static void terminateinput(void); 97 static void xtrfile(char *, long); 98 static void xtrlnkfile(char *, long); 99 static void xtrlnkskip(char *, long); 100 static void xtrmap(char *, long); 101 static void xtrmapskip(char *, long); 102 static void xtrskip(char *, long); 103 104 static int readmapflag; 105 106 /* 107 * Set up an input source 108 */ 109 void 110 setinput(char *source) 111 { 112 FLUSHTAPEBUF(); 113 if (bflag) 114 newtapebuf(ntrec); 115 else 116 newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC); 117 terminal = stdin; 118 119 #ifdef RRESTORE 120 if (strchr(source, ':')) { 121 host = source; 122 source = strchr(host, ':'); 123 *source++ = '\0'; 124 if (rmthost(host) == 0) 125 done(1); 126 } else 127 #endif 128 if (strcmp(source, "-") == 0) { 129 /* 130 * Since input is coming from a pipe we must establish 131 * our own connection to the terminal. 132 */ 133 terminal = fopen(_PATH_TTY, "r"); 134 if (terminal == NULL) { 135 fprintf(stderr, "cannot open %s: %s\n", 136 _PATH_TTY, strerror(errno)); 137 terminal = fopen(_PATH_DEVNULL, "r"); 138 if (terminal == NULL) { 139 fprintf(stderr, "cannot open %s: %s\n", 140 _PATH_DEVNULL, strerror(errno)); 141 done(1); 142 } 143 } 144 pipein++; 145 } 146 setuid(getuid()); /* no longer need or want root privileges */ 147 magtape = strdup(source); 148 if (magtape == NULL) { 149 fprintf(stderr, "Cannot allocate space for magtape buffer\n"); 150 done(1); 151 } 152 } 153 154 void 155 newtapebuf(long size) 156 { 157 static long tapebufsize = -1; 158 159 ntrec = size; 160 if (size <= tapebufsize) 161 return; 162 if (tapebuf != NULL) 163 free(tapebuf); 164 tapebuf = malloc(size * TP_BSIZE); 165 if (tapebuf == NULL) { 166 fprintf(stderr, "Cannot allocate space for tape buffer\n"); 167 done(1); 168 } 169 tapebufsize = size; 170 } 171 172 /* 173 * Verify that the tape drive can be accessed and 174 * that it actually is a dump tape. 175 */ 176 void 177 setup(void) 178 { 179 int i, j, *ip; 180 struct stat stbuf; 181 182 vprintf(stdout, "Verify tape and initialize maps\n"); 183 #ifdef RRESTORE 184 if (host) 185 mt = rmtopen(magtape, 0); 186 else 187 #endif 188 if (pipein) 189 mt = 0; 190 else 191 mt = open(magtape, O_RDONLY, 0); 192 if (mt < 0) { 193 fprintf(stderr, "%s: %s\n", magtape, strerror(errno)); 194 done(1); 195 } 196 volno = 1; 197 setdumpnum(); 198 FLUSHTAPEBUF(); 199 if (!pipein && !bflag) 200 findtapeblksize(); 201 if (gethead(&spcl) == FAIL) { 202 blkcnt--; /* push back this block */ 203 blksread--; 204 cvtflag++; 205 if (gethead(&spcl) == FAIL) { 206 fprintf(stderr, "Tape is not a dump tape\n"); 207 done(1); 208 } 209 fprintf(stderr, "Converting to new file system format.\n"); 210 } 211 if (pipein) { 212 endoftapemark.s_spcl.c_magic = cvtflag ? OFS_MAGIC : NFS_MAGIC; 213 endoftapemark.s_spcl.c_type = TS_END; 214 ip = (int *)&endoftapemark; 215 j = sizeof(union u_spcl) / sizeof(int); 216 i = 0; 217 do 218 i += *ip++; 219 while (--j); 220 endoftapemark.s_spcl.c_checksum = CHECKSUM - i; 221 } 222 if (vflag || command == 't') 223 printdumpinfo(); 224 dumptime = spcl.c_ddate; 225 dumpdate = spcl.c_date; 226 if (stat(".", &stbuf) < 0) { 227 fprintf(stderr, "cannot stat .: %s\n", strerror(errno)); 228 done(1); 229 } 230 if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE ) 231 fssize = TP_BSIZE; 232 if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE) 233 fssize = stbuf.st_blksize; 234 if (((fssize - 1) & fssize) != 0) { 235 fprintf(stderr, "bad block size %ld\n", fssize); 236 done(1); 237 } 238 if (spcl.c_volume != 1) { 239 fprintf(stderr, "Tape is not volume 1 of the dump\n"); 240 done(1); 241 } 242 if (gethead(&spcl) == FAIL) { 243 dprintf(stdout, "header read failed at %ld blocks\n", blksread); 244 panic("no header after volume mark!\n"); 245 } 246 findinode(&spcl); 247 if (spcl.c_type != TS_CLRI) { 248 fprintf(stderr, "Cannot find file removal list\n"); 249 done(1); 250 } 251 maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1; 252 dprintf(stdout, "maxino = %d\n", maxino); 253 map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY)); 254 if (map == NULL) 255 panic("no memory for active inode map\n"); 256 usedinomap = map; 257 curfile.action = USING; 258 getfile(xtrmap, xtrmapskip); 259 if (spcl.c_type != TS_BITS) { 260 fprintf(stderr, "Cannot find file dump list\n"); 261 done(1); 262 } 263 map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY)); 264 if (map == NULL) 265 panic("no memory for file dump list\n"); 266 dumpmap = map; 267 curfile.action = USING; 268 getfile(xtrmap, xtrmapskip); 269 /* 270 * If there may be whiteout entries on the tape, pretend that the 271 * whiteout inode exists, so that the whiteout entries can be 272 * extracted. 273 */ 274 if (oldinofmt == 0) 275 SETINO(WINO, dumpmap); 276 /* 'r' restores don't call getvol() for tape 1, so mark it as read. */ 277 if (command == 'r') 278 tapesread = 1; 279 } 280 281 /* 282 * Prompt user to load a new dump volume. 283 * "Nextvol" is the next suggested volume to use. 284 * This suggested volume is enforced when doing full 285 * or incremental restores, but can be overridden by 286 * the user when only extracting a subset of the files. 287 */ 288 void 289 getvol(long nextvol) 290 { 291 long newvol = 0, prevtapea, savecnt, i; 292 union u_spcl tmpspcl; 293 # define tmpbuf tmpspcl.s_spcl 294 char buf[TP_BSIZE]; 295 296 if (nextvol == 1) { 297 tapesread = 0; 298 gettingfile = 0; 299 } 300 prevtapea = tapeaddr; 301 savecnt = blksread; 302 if (pipein) { 303 if (nextvol != 1) { 304 panic("Changing volumes on pipe input?\n"); 305 /* Avoid looping if we couldn't ask the user. */ 306 if (yflag || ferror(terminal) || feof(terminal)) 307 done(1); 308 } 309 if (volno == 1) 310 return; 311 goto gethdr; 312 } 313 again: 314 if (pipein) 315 done(1); /* pipes do not get a second chance */ 316 if (command == 'R' || command == 'r' || curfile.action != SKIP) 317 newvol = nextvol; 318 else 319 newvol = 0; 320 while (newvol <= 0) { 321 if (tapesread == 0) { 322 fprintf(stderr, "%s%s%s%s%s%s%s", 323 "You have not read any tapes yet.\n", 324 "If you are extracting just a few files,", 325 " start with the last volume\n", 326 "and work towards the first; restore", 327 " can quickly skip tapes that\n", 328 "have no further files to extract.", 329 " Otherwise, begin with volume 1.\n"); 330 } else { 331 fprintf(stderr, "You have read volumes"); 332 strcpy(buf, ": "); 333 for (i = 0; i < 32; i++) 334 if (tapesread & (1 << i)) { 335 fprintf(stderr, "%s%ld", buf, i + 1); 336 strcpy(buf, ", "); 337 } 338 fprintf(stderr, "\n"); 339 } 340 do { 341 fprintf(stderr, "Specify next volume #: "); 342 fflush(stderr); 343 if (fgets(buf, BUFSIZ, terminal) == NULL) 344 done(1); 345 } while (buf[0] == '\n'); 346 newvol = atoi(buf); 347 if (newvol <= 0) { 348 fprintf(stderr, 349 "Volume numbers are positive numerics\n"); 350 } 351 } 352 if (newvol == volno) { 353 tapesread |= 1 << (volno - 1); 354 return; 355 } 356 closemt(); 357 fprintf(stderr, "Mount tape volume %ld\n", newvol); 358 fprintf(stderr, "Enter ``none'' if there are no more tapes\n"); 359 fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape); 360 fflush(stderr); 361 if (fgets(buf, BUFSIZ, terminal) == NULL) 362 done(1); 363 if (!strcmp(buf, "none\n")) { 364 terminateinput(); 365 return; 366 } 367 if (buf[0] != '\n') { 368 strcpy(magtape, buf); 369 magtape[strlen(magtape) - 1] = '\0'; 370 } 371 #ifdef RRESTORE 372 if (host) 373 mt = rmtopen(magtape, 0); 374 else 375 #endif 376 mt = open(magtape, O_RDONLY, 0); 377 378 if (mt == -1) { 379 fprintf(stderr, "Cannot open %s\n", magtape); 380 volno = -1; 381 goto again; 382 } 383 gethdr: 384 volno = newvol; 385 setdumpnum(); 386 FLUSHTAPEBUF(); 387 if (gethead(&tmpbuf) == FAIL) { 388 dprintf(stdout, "header read failed at %ld blocks\n", blksread); 389 fprintf(stderr, "tape is not dump tape\n"); 390 volno = 0; 391 goto again; 392 } 393 if (tmpbuf.c_volume != volno) { 394 fprintf(stderr, "Wrong volume (%ld)\n", (long)tmpbuf.c_volume); 395 volno = 0; 396 goto again; 397 } 398 if (tmpbuf.c_date != dumpdate || tmpbuf.c_ddate != dumptime) { 399 time_t c_date = tmpbuf.c_date; 400 fprintf(stderr, "Wrong dump date\n\tgot: %s", ctime(&c_date)); 401 fprintf(stderr, "\twanted: %s", ctime(&dumpdate)); 402 volno = 0; 403 goto again; 404 } 405 tapesread |= 1 << (volno - 1); 406 blksread = savecnt; 407 /* 408 * If continuing from the previous volume, skip over any 409 * blocks read already at the end of the previous volume. 410 * 411 * If coming to this volume at random, skip to the beginning 412 * of the next record. 413 */ 414 dprintf(stdout, "last rec %ld, tape starts with %ld\n", prevtapea, 415 (long)tmpbuf.c_tapea); 416 if (tmpbuf.c_type == TS_TAPE && (tmpbuf.c_flags & DR_NEWHEADER)) { 417 if (curfile.action != USING) { 418 /* 419 * XXX Dump incorrectly sets c_count to 1 in the 420 * volume header of the first tape, so ignore 421 * c_count when volno == 1. 422 */ 423 if (volno != 1) 424 for (i = tmpbuf.c_count; i > 0; i--) 425 readtape(buf); 426 } else if (tmpbuf.c_tapea <= prevtapea) { 427 /* 428 * Normally the value of c_tapea in the volume 429 * header is the record number of the header itself. 430 * However in the volume header following an EOT- 431 * terminated tape, it is the record number of the 432 * first continuation data block (dump bug?). 433 * 434 * The next record we want is `prevtapea + 1'. 435 */ 436 i = prevtapea + 1 - tmpbuf.c_tapea; 437 dprintf(stderr, "Skipping %ld duplicate record%s.\n", 438 i, i > 1 ? "s" : ""); 439 while (--i >= 0) 440 readtape(buf); 441 } 442 } 443 if (curfile.action == USING) { 444 if (volno == 1) 445 panic("active file into volume 1\n"); 446 return; 447 } 448 gethead(&spcl); 449 findinode(&spcl); 450 if (gettingfile) { 451 gettingfile = 0; 452 longjmp(restart, 1); 453 } 454 } 455 456 /* 457 * Handle unexpected EOF. 458 */ 459 static void 460 terminateinput(void) 461 { 462 463 if (gettingfile && curfile.action == USING) { 464 printf("Warning: %s %s\n", 465 "End-of-input encountered while extracting", curfile.name); 466 } 467 curfile.name = "<name unknown>"; 468 curfile.action = UNKNOWN; 469 curfile.dip = NULL; 470 curfile.ino = maxino; 471 if (gettingfile) { 472 gettingfile = 0; 473 longjmp(restart, 1); 474 } 475 } 476 477 /* 478 * handle multiple dumps per tape by skipping forward to the 479 * appropriate one. 480 */ 481 static void 482 setdumpnum(void) 483 { 484 struct mtop tcom; 485 486 if (dumpnum == 1 || volno != 1) 487 return; 488 if (pipein) { 489 fprintf(stderr, "Cannot have multiple dumps on pipe input\n"); 490 done(1); 491 } 492 tcom.mt_op = MTFSF; 493 tcom.mt_count = dumpnum - 1; 494 #ifdef RRESTORE 495 if (host) 496 rmtioctl(MTFSF, dumpnum - 1); 497 else 498 #endif 499 if (ioctl(mt, MTIOCTOP, (char *)&tcom) < 0) 500 fprintf(stderr, "ioctl MTFSF: %s\n", strerror(errno)); 501 } 502 503 void 504 printdumpinfo(void) 505 { 506 time_t c_date = spcl.c_date; 507 time_t c_ddate = spcl.c_ddate; 508 509 fprintf(stdout, "Dump date: %s", ctime(&c_date)); 510 fprintf(stdout, "Dumped from: %s", 511 (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&c_ddate)); 512 if (spcl.c_host[0] == '\0') 513 return; 514 fprintf(stderr, "Level %ld dump of %s on %s:%s\n", 515 (long)spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev); 516 fprintf(stderr, "Label: %s\n", spcl.c_label); 517 } 518 519 int 520 extractfile(char *name) 521 { 522 int flags; 523 uid_t uid; 524 gid_t gid; 525 mode_t mode; 526 struct timeval timep[2]; 527 struct entry *ep; 528 529 curfile.name = name; 530 curfile.action = USING; 531 timep[0].tv_sec = curfile.dip->di_atime; 532 timep[0].tv_usec = curfile.dip->di_atimensec / 1000; 533 timep[1].tv_sec = curfile.dip->di_mtime; 534 timep[1].tv_usec = curfile.dip->di_mtimensec / 1000; 535 uid = curfile.dip->di_uid; 536 gid = curfile.dip->di_gid; 537 mode = curfile.dip->di_mode; 538 flags = curfile.dip->di_flags; 539 switch (mode & IFMT) { 540 541 default: 542 fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode); 543 skipfile(); 544 return (FAIL); 545 546 case IFSOCK: 547 vprintf(stdout, "skipped socket %s\n", name); 548 skipfile(); 549 return (GOOD); 550 551 case IFDIR: 552 if (mflag) { 553 ep = lookupname(name); 554 if (ep == NULL || ep->e_flags & EXTRACT) 555 panic("unextracted directory %s\n", name); 556 skipfile(); 557 return (GOOD); 558 } 559 vprintf(stdout, "extract file %s\n", name); 560 return (genliteraldir(name, curfile.ino)); 561 562 case IFLNK: 563 lnkbuf[0] = '\0'; 564 pathlen = 0; 565 getfile(xtrlnkfile, xtrlnkskip); 566 if (pathlen == 0) { 567 vprintf(stdout, 568 "%s: zero length symbolic link (ignored)\n", name); 569 return (GOOD); 570 } 571 if (linkit(lnkbuf, name, SYMLINK) == GOOD) { 572 lchown(name, uid, gid); 573 lchmod(name, mode); 574 lutimes(name, timep); 575 return (GOOD); 576 } 577 return (FAIL); 578 579 case IFIFO: 580 vprintf(stdout, "extract fifo %s\n", name); 581 if (Nflag) { 582 skipfile(); 583 return (GOOD); 584 } 585 if (uflag && !Nflag) 586 unlink(name); 587 if (mkfifo(name, mode) < 0) { 588 fprintf(stderr, "%s: cannot create fifo: %s\n", 589 name, strerror(errno)); 590 skipfile(); 591 return (FAIL); 592 } 593 chown(name, uid, gid); 594 chmod(name, mode); 595 utimes(name, timep); 596 chflags(name, flags); 597 skipfile(); 598 return (GOOD); 599 600 case IFCHR: 601 case IFBLK: 602 vprintf(stdout, "extract special file %s\n", name); 603 if (Nflag) { 604 skipfile(); 605 return (GOOD); 606 } 607 if (uflag) 608 unlink(name); 609 if (mknod(name, mode, (int)curfile.dip->di_rdev) < 0) { 610 fprintf(stderr, "%s: cannot create special file: %s\n", 611 name, strerror(errno)); 612 skipfile(); 613 return (FAIL); 614 } 615 chown(name, uid, gid); 616 chmod(name, mode); 617 utimes(name, timep); 618 chflags(name, flags); 619 skipfile(); 620 return (GOOD); 621 622 case IFREG: 623 vprintf(stdout, "extract file %s\n", name); 624 if (Nflag) { 625 skipfile(); 626 return (GOOD); 627 } 628 if (uflag) 629 unlink(name); 630 if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC, 631 0666)) < 0) { 632 fprintf(stderr, "%s: cannot create file: %s\n", 633 name, strerror(errno)); 634 skipfile(); 635 return (FAIL); 636 } 637 fchown(ofile, uid, gid); 638 fchmod(ofile, mode); 639 getfile(xtrfile, xtrskip); 640 close(ofile); 641 utimes(name, timep); 642 chflags(name, flags); 643 return (GOOD); 644 } 645 /* NOTREACHED */ 646 } 647 648 /* 649 * skip over bit maps on the tape 650 */ 651 void 652 skipmaps(void) 653 { 654 655 while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI) 656 skipfile(); 657 } 658 659 /* 660 * skip over a file on the tape 661 */ 662 void 663 skipfile(void) 664 { 665 666 curfile.action = SKIP; 667 getfile(xtrnull, xtrnull); 668 } 669 670 /* 671 * Extract a file from the tape. 672 * When an allocated block is found it is passed to the fill function; 673 * when an unallocated block (hole) is found, a zeroed buffer is passed 674 * to the skip function. 675 */ 676 void 677 getfile(void (*fill) (char *, long), void (*skip) (char *, long)) 678 { 679 int i; 680 int curblk = 0; 681 quad_t size = spcl.c_dinode.di_size; 682 static char clearedbuf[MAXBSIZE]; 683 char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE]; 684 char junk[TP_BSIZE]; 685 686 if (spcl.c_type == TS_END) 687 panic("ran off end of tape\n"); 688 if (spcl.c_magic != NFS_MAGIC) 689 panic("not at beginning of a file\n"); 690 if (!gettingfile && setjmp(restart) != 0) 691 return; 692 gettingfile++; 693 loop: 694 for (i = 0; i < spcl.c_count; i++) { 695 if (readmapflag || spcl.c_addr[i]) { 696 readtape(&buf[curblk++][0]); 697 if (curblk == fssize / TP_BSIZE) { 698 (*fill)((char *)buf, (long)(size > TP_BSIZE ? 699 fssize : (curblk - 1) * TP_BSIZE + size)); 700 curblk = 0; 701 } 702 } else { 703 if (curblk > 0) { 704 (*fill)((char *)buf, (long)(size > TP_BSIZE ? 705 curblk * TP_BSIZE : 706 (curblk - 1) * TP_BSIZE + size)); 707 curblk = 0; 708 } 709 (*skip)(clearedbuf, (long)(size > TP_BSIZE ? 710 TP_BSIZE : size)); 711 } 712 if ((size -= TP_BSIZE) <= 0) { 713 for (i++; i < spcl.c_count; i++) 714 if (readmapflag || spcl.c_addr[i]) 715 readtape(junk); 716 break; 717 } 718 } 719 if (gethead(&spcl) == GOOD && size > 0) { 720 if (spcl.c_type == TS_ADDR) 721 goto loop; 722 dprintf(stdout, 723 "Missing address (header) block for %s at %ld blocks\n", 724 curfile.name, blksread); 725 } 726 if (curblk > 0) 727 (*fill)((char *)buf, (long)((curblk * TP_BSIZE) + size)); 728 findinode(&spcl); 729 gettingfile = 0; 730 } 731 732 /* 733 * Write out the next block of a file. 734 */ 735 static void 736 xtrfile(char *buf, long size) 737 { 738 739 if (Nflag) 740 return; 741 if (write(ofile, buf, (int) size) == -1) { 742 fprintf(stderr, 743 "write error extracting inode %d, name %s\nwrite: %s\n", 744 curfile.ino, curfile.name, strerror(errno)); 745 } 746 } 747 748 /* 749 * Skip over a hole in a file. 750 */ 751 /* ARGSUSED */ 752 static void 753 xtrskip(char *buf, long size) 754 { 755 756 if (lseek(ofile, size, SEEK_CUR) == -1) { 757 fprintf(stderr, 758 "seek error extracting inode %d, name %s\nlseek: %s\n", 759 curfile.ino, curfile.name, strerror(errno)); 760 done(1); 761 } 762 } 763 764 /* 765 * Collect the next block of a symbolic link. 766 */ 767 static void 768 xtrlnkfile(char *buf, long size) 769 { 770 771 pathlen += size; 772 if (pathlen > MAXPATHLEN) { 773 fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n", 774 curfile.name, lnkbuf, buf, pathlen); 775 done(1); 776 } 777 strcat(lnkbuf, buf); 778 } 779 780 /* 781 * Skip over a hole in a symbolic link (should never happen). 782 */ 783 /* ARGSUSED */ 784 static void 785 xtrlnkskip(char *buf, long size) 786 { 787 788 fprintf(stderr, "unallocated block in symbolic link %s\n", 789 curfile.name); 790 done(1); 791 } 792 793 /* 794 * Collect the next block of a bit map. 795 */ 796 static void 797 xtrmap(char *buf, long size) 798 { 799 800 memmove(map, buf, size); 801 map += size; 802 } 803 804 /* 805 * Skip over a hole in a bit map (should never happen). 806 */ 807 /* ARGSUSED */ 808 static void 809 xtrmapskip(char *buf, long size) 810 { 811 812 panic("hole in map\n"); 813 map += size; 814 } 815 816 /* 817 * Noop, when an extraction function is not needed. 818 */ 819 /* ARGSUSED */ 820 void 821 xtrnull(char *buf, long size) 822 { 823 824 return; 825 } 826 827 /* 828 * Read TP_BSIZE blocks from the input. 829 * Handle read errors, and end of media. 830 */ 831 static void 832 readtape(char *buf) 833 { 834 long rd, newvol, i; 835 int cnt, seek_failed; 836 837 if (blkcnt < numtrec) { 838 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE); 839 blksread++; 840 tapeaddr++; 841 return; 842 } 843 for (i = 0; i < ntrec; i++) 844 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0; 845 if (numtrec == 0) 846 numtrec = ntrec; 847 cnt = ntrec * TP_BSIZE; 848 rd = 0; 849 getmore: 850 #ifdef RRESTORE 851 if (host) 852 i = rmtread(&tapebuf[rd], cnt); 853 else 854 #endif 855 i = read(mt, &tapebuf[rd], cnt); 856 /* 857 * Check for mid-tape short read error. 858 * If found, skip rest of buffer and start with the next. 859 */ 860 if (!pipein && numtrec < ntrec && i > 0) { 861 dprintf(stdout, "mid-media short read error.\n"); 862 numtrec = ntrec; 863 } 864 /* 865 * Handle partial block read. 866 */ 867 if (pipein && i == 0 && rd > 0) 868 i = rd; 869 else if (i > 0 && i != ntrec * TP_BSIZE) { 870 if (pipein) { 871 rd += i; 872 cnt -= i; 873 if (cnt > 0) 874 goto getmore; 875 i = rd; 876 } else { 877 /* 878 * Short read. Process the blocks read. 879 */ 880 if (i % TP_BSIZE != 0) 881 vprintf(stdout, 882 "partial block read: %ld should be %ld\n", 883 i, ntrec * TP_BSIZE); 884 numtrec = i / TP_BSIZE; 885 } 886 } 887 /* 888 * Handle read error. 889 */ 890 if (i < 0) { 891 fprintf(stderr, "Tape read error while "); 892 switch (curfile.action) { 893 default: 894 fprintf(stderr, "trying to set up tape\n"); 895 break; 896 case UNKNOWN: 897 fprintf(stderr, "trying to resynchronize\n"); 898 break; 899 case USING: 900 fprintf(stderr, "restoring %s\n", curfile.name); 901 break; 902 case SKIP: 903 fprintf(stderr, "skipping over inode %d\n", 904 curfile.ino); 905 break; 906 } 907 if (!yflag && !reply("continue")) 908 done(1); 909 i = ntrec * TP_BSIZE; 910 memset(tapebuf, 0, i); 911 #ifdef RRESTORE 912 if (host) 913 seek_failed = (rmtseek(i, 1) < 0); 914 else 915 #endif 916 seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1); 917 918 if (seek_failed) { 919 fprintf(stderr, 920 "continuation failed: %s\n", strerror(errno)); 921 done(1); 922 } 923 } 924 /* 925 * Handle end of tape. 926 */ 927 if (i == 0) { 928 vprintf(stdout, "End-of-tape encountered\n"); 929 if (!pipein) { 930 newvol = volno + 1; 931 volno = 0; 932 numtrec = 0; 933 getvol(newvol); 934 readtape(buf); 935 return; 936 } 937 if (rd % TP_BSIZE != 0) 938 panic("partial block read: %d should be %d\n", 939 rd, ntrec * TP_BSIZE); 940 terminateinput(); 941 memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE); 942 } 943 blkcnt = 0; 944 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE); 945 blksread++; 946 tapeaddr++; 947 } 948 949 static void 950 findtapeblksize(void) 951 { 952 long i; 953 954 for (i = 0; i < ntrec; i++) 955 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0; 956 blkcnt = 0; 957 #ifdef RRESTORE 958 if (host) 959 i = rmtread(tapebuf, ntrec * TP_BSIZE); 960 else 961 #endif 962 i = read(mt, tapebuf, ntrec * TP_BSIZE); 963 964 if (i <= 0) { 965 fprintf(stderr, "tape read error: %s\n", strerror(errno)); 966 done(1); 967 } 968 if (i % TP_BSIZE != 0) { 969 fprintf(stderr, "Tape block size (%ld) %s (%d)\n", 970 i, "is not a multiple of dump block size", TP_BSIZE); 971 done(1); 972 } 973 ntrec = i / TP_BSIZE; 974 numtrec = ntrec; 975 vprintf(stdout, "Tape block size is %ld\n", ntrec); 976 } 977 978 void 979 closemt(void) 980 { 981 982 if (mt < 0) 983 return; 984 #ifdef RRESTORE 985 if (host) 986 rmtclose(); 987 else 988 #endif 989 close(mt); 990 } 991 992 /* 993 * Read the next block from the tape. 994 * Check to see if it is one of several vintage headers. 995 * If it is an old style header, convert it to a new style header. 996 * If it is not any valid header, return an error. 997 */ 998 static int 999 gethead(struct s_spcl *buf) 1000 { 1001 long i; 1002 union { 1003 quad_t qval; 1004 int32_t val[2]; 1005 } qcvt; 1006 union u_ospcl { 1007 char dummy[TP_BSIZE]; 1008 struct s_ospcl { 1009 int32_t c_type; 1010 int32_t c_date; 1011 int32_t c_ddate; 1012 int32_t c_volume; 1013 int32_t c_tapea; 1014 u_short c_inumber; 1015 int32_t c_magic; 1016 int32_t c_checksum; 1017 struct odinode { 1018 unsigned short odi_mode; 1019 u_short odi_nlink; 1020 u_short odi_uid; 1021 u_short odi_gid; 1022 int32_t odi_size; 1023 int32_t odi_rdev; 1024 char odi_addr[36]; 1025 int32_t odi_atime; 1026 int32_t odi_mtime; 1027 int32_t odi_ctime; 1028 } c_dinode; 1029 int32_t c_count; 1030 char c_addr[256]; 1031 } s_ospcl; 1032 } u_ospcl; 1033 1034 if (!cvtflag) { 1035 readtape((char *)buf); 1036 if (buf->c_magic != NFS_MAGIC) { 1037 if (swabl(buf->c_magic) != NFS_MAGIC) 1038 return (FAIL); 1039 if (!Bcvt) { 1040 vprintf(stdout, "Note: Doing Byte swapping\n"); 1041 Bcvt = 1; 1042 } 1043 } 1044 if (checksum((int *)buf) == FAIL) 1045 return (FAIL); 1046 if (Bcvt) { 1047 swabst((u_char *)"8l4s31l", (u_char *)buf); 1048 swabst((u_char *)"l",(u_char *) &buf->c_level); 1049 swabst((u_char *)"2l",(u_char *) &buf->c_flags); 1050 } 1051 goto good; 1052 } 1053 readtape((char *)(&u_ospcl.s_ospcl)); 1054 memset(buf, 0, (long)TP_BSIZE); 1055 buf->c_type = u_ospcl.s_ospcl.c_type; 1056 buf->c_date = u_ospcl.s_ospcl.c_date; 1057 buf->c_ddate = u_ospcl.s_ospcl.c_ddate; 1058 buf->c_volume = u_ospcl.s_ospcl.c_volume; 1059 buf->c_tapea = u_ospcl.s_ospcl.c_tapea; 1060 buf->c_inumber = u_ospcl.s_ospcl.c_inumber; 1061 buf->c_checksum = u_ospcl.s_ospcl.c_checksum; 1062 buf->c_magic = u_ospcl.s_ospcl.c_magic; 1063 buf->c_dinode.di_mode = u_ospcl.s_ospcl.c_dinode.odi_mode; 1064 buf->c_dinode.di_nlink = u_ospcl.s_ospcl.c_dinode.odi_nlink; 1065 buf->c_dinode.di_uid = u_ospcl.s_ospcl.c_dinode.odi_uid; 1066 buf->c_dinode.di_gid = u_ospcl.s_ospcl.c_dinode.odi_gid; 1067 buf->c_dinode.di_size = u_ospcl.s_ospcl.c_dinode.odi_size; 1068 buf->c_dinode.di_rdev = u_ospcl.s_ospcl.c_dinode.odi_rdev; 1069 buf->c_dinode.di_atime = u_ospcl.s_ospcl.c_dinode.odi_atime; 1070 buf->c_dinode.di_mtime = u_ospcl.s_ospcl.c_dinode.odi_mtime; 1071 buf->c_dinode.di_ctime = u_ospcl.s_ospcl.c_dinode.odi_ctime; 1072 buf->c_count = u_ospcl.s_ospcl.c_count; 1073 memmove(buf->c_addr, u_ospcl.s_ospcl.c_addr, (long)256); 1074 if (u_ospcl.s_ospcl.c_magic != OFS_MAGIC || 1075 checksum((int *)(&u_ospcl.s_ospcl)) == FAIL) 1076 return(FAIL); 1077 buf->c_magic = NFS_MAGIC; 1078 1079 good: 1080 if ((buf->c_dinode.di_size == 0 || buf->c_dinode.di_size > 0xfffffff) && 1081 (buf->c_dinode.di_mode & IFMT) == IFDIR && Qcvt == 0) { 1082 qcvt.qval = buf->c_dinode.di_size; 1083 if (qcvt.val[0] || qcvt.val[1]) { 1084 printf("Note: Doing Quad swapping\n"); 1085 Qcvt = 1; 1086 } 1087 } 1088 if (Qcvt) { 1089 qcvt.qval = buf->c_dinode.di_size; 1090 i = qcvt.val[1]; 1091 qcvt.val[1] = qcvt.val[0]; 1092 qcvt.val[0] = i; 1093 buf->c_dinode.di_size = qcvt.qval; 1094 } 1095 readmapflag = 0; 1096 1097 switch (buf->c_type) { 1098 1099 case TS_CLRI: 1100 case TS_BITS: 1101 /* 1102 * Have to patch up missing information in bit map headers 1103 */ 1104 buf->c_inumber = 0; 1105 buf->c_dinode.di_size = buf->c_count * TP_BSIZE; 1106 if (buf->c_count > TP_NINDIR) 1107 readmapflag = 1; 1108 else 1109 for (i = 0; i < buf->c_count; i++) 1110 buf->c_addr[i]++; 1111 break; 1112 1113 case TS_TAPE: 1114 if ((buf->c_flags & DR_NEWINODEFMT) == 0) 1115 oldinofmt = 1; 1116 /* fall through */ 1117 case TS_END: 1118 buf->c_inumber = 0; 1119 break; 1120 1121 case TS_INODE: 1122 case TS_ADDR: 1123 break; 1124 1125 default: 1126 panic("gethead: unknown inode type %d\n", buf->c_type); 1127 break; 1128 } 1129 /* 1130 * If we are restoring a filesystem with old format inodes, 1131 * copy the uid/gid to the new location. 1132 */ 1133 if (oldinofmt) { 1134 buf->c_dinode.di_uid = buf->c_dinode.di_ouid; 1135 buf->c_dinode.di_gid = buf->c_dinode.di_ogid; 1136 } 1137 tapeaddr = buf->c_tapea; 1138 if (dflag) 1139 accthdr(buf); 1140 return(GOOD); 1141 } 1142 1143 /* 1144 * Check that a header is where it belongs and predict the next header 1145 */ 1146 static void 1147 accthdr(struct s_spcl *header) 1148 { 1149 static ufs1_ino_t previno = 0x7fffffff; 1150 static int prevtype; 1151 static long predict; 1152 long blks, i; 1153 1154 if (header->c_type == TS_TAPE) { 1155 fprintf(stderr, "Volume header (%s inode format) ", 1156 oldinofmt ? "old" : "new"); 1157 if (header->c_firstrec) 1158 fprintf(stderr, "begins with record %ld", 1159 (long)header->c_firstrec); 1160 fprintf(stderr, "\n"); 1161 previno = 0x7fffffff; 1162 return; 1163 } 1164 if (previno == 0x7fffffff) 1165 goto newcalc; 1166 switch (prevtype) { 1167 case TS_BITS: 1168 fprintf(stderr, "Dumped inodes map header"); 1169 break; 1170 case TS_CLRI: 1171 fprintf(stderr, "Used inodes map header"); 1172 break; 1173 case TS_INODE: 1174 fprintf(stderr, "File header, ino %d", previno); 1175 break; 1176 case TS_ADDR: 1177 fprintf(stderr, "File continuation header, ino %d", previno); 1178 break; 1179 case TS_END: 1180 fprintf(stderr, "End of tape header"); 1181 break; 1182 } 1183 if (predict != blksread - 1) 1184 fprintf(stderr, "; predicted %ld blocks, got %ld blocks", 1185 predict, blksread - 1); 1186 fprintf(stderr, "\n"); 1187 newcalc: 1188 blks = 0; 1189 if (header->c_type != TS_END) 1190 for (i = 0; i < header->c_count; i++) 1191 if (readmapflag || header->c_addr[i] != 0) 1192 blks++; 1193 predict = blks; 1194 blksread = 0; 1195 prevtype = header->c_type; 1196 previno = header->c_inumber; 1197 } 1198 1199 /* 1200 * Find an inode header. 1201 * Complain if had to skip. 1202 */ 1203 static void 1204 findinode(struct s_spcl *header) 1205 { 1206 static long skipcnt = 0; 1207 long i; 1208 char buf[TP_BSIZE]; 1209 int htype; 1210 1211 curfile.name = "<name unknown>"; 1212 curfile.action = UNKNOWN; 1213 curfile.dip = NULL; 1214 curfile.ino = 0; 1215 do { 1216 if (header->c_magic != NFS_MAGIC) { 1217 skipcnt++; 1218 while (gethead(header) == FAIL || 1219 header->c_date != dumpdate) 1220 skipcnt++; 1221 } 1222 htype = header->c_type; 1223 switch (htype) { 1224 1225 case TS_ADDR: 1226 /* 1227 * Skip up to the beginning of the next record 1228 */ 1229 for (i = 0; i < header->c_count; i++) 1230 if (header->c_addr[i]) 1231 readtape(buf); 1232 while (gethead(header) == FAIL || 1233 header->c_date != dumpdate) 1234 skipcnt++; 1235 break; 1236 1237 case TS_INODE: 1238 curfile.dip = &header->c_dinode; 1239 curfile.ino = header->c_inumber; 1240 break; 1241 1242 case TS_END: 1243 /* If we missed some tapes, get another volume. */ 1244 if (tapesread & (tapesread + 1)) { 1245 getvol(0); 1246 continue; 1247 } 1248 curfile.ino = maxino; 1249 break; 1250 1251 case TS_CLRI: 1252 curfile.name = "<file removal list>"; 1253 break; 1254 1255 case TS_BITS: 1256 curfile.name = "<file dump list>"; 1257 break; 1258 1259 case TS_TAPE: 1260 panic("unexpected tape header\n"); 1261 /* NOTREACHED */ 1262 1263 default: 1264 panic("unknown tape header type %d\n", spcl.c_type); 1265 /* NOTREACHED */ 1266 1267 } 1268 } while (htype == TS_ADDR); 1269 if (skipcnt > 0) 1270 fprintf(stderr, "resync restore, skipped %ld blocks\n", 1271 skipcnt); 1272 skipcnt = 0; 1273 } 1274 1275 static int 1276 checksum(int *buf) 1277 { 1278 int i, j; 1279 1280 j = sizeof(union u_spcl) / sizeof(int); 1281 i = 0; 1282 if(!Bcvt) { 1283 do 1284 i += *buf++; 1285 while (--j); 1286 } else { 1287 /* What happens if we want to read restore tapes 1288 for a 16bit int machine??? */ 1289 do 1290 i += swabl(*buf++); 1291 while (--j); 1292 } 1293 1294 if (i != CHECKSUM) { 1295 fprintf(stderr, "Checksum error %o, inode %d file %s\n", i, 1296 curfile.ino, curfile.name); 1297 return(FAIL); 1298 } 1299 return(GOOD); 1300 } 1301 1302 #ifdef RRESTORE 1303 #include <stdarg.h> 1304 1305 void 1306 msg(const char *fmt, ...) 1307 { 1308 va_list ap; 1309 va_start(ap, fmt); 1310 vfprintf(stderr, fmt, ap); 1311 va_end(ap); 1312 } 1313 #endif /* RRESTORE */ 1314 1315 static u_char * 1316 swabshort(u_char *sp, int n) 1317 { 1318 char c; 1319 1320 while (--n >= 0) { 1321 c = sp[0]; sp[0] = sp[1]; sp[1] = c; 1322 sp += 2; 1323 } 1324 return (sp); 1325 } 1326 1327 static u_char * 1328 swablong(u_char *sp, int n) 1329 { 1330 char c; 1331 1332 while (--n >= 0) { 1333 c = sp[0]; sp[0] = sp[3]; sp[3] = c; 1334 c = sp[2]; sp[2] = sp[1]; sp[1] = c; 1335 sp += 4; 1336 } 1337 return (sp); 1338 } 1339 1340 void 1341 swabst(u_char *cp, u_char *sp) 1342 { 1343 int n = 0; 1344 1345 while (*cp) { 1346 switch (*cp) { 1347 case '0': case '1': case '2': case '3': case '4': 1348 case '5': case '6': case '7': case '8': case '9': 1349 n = (n * 10) + (*cp++ - '0'); 1350 continue; 1351 1352 case 's': case 'w': case 'h': 1353 if (n == 0) 1354 n = 1; 1355 sp = swabshort(sp, n); 1356 break; 1357 1358 case 'l': 1359 if (n == 0) 1360 n = 1; 1361 sp = swablong(sp, n); 1362 break; 1363 1364 default: /* Any other character, like 'b' counts as byte. */ 1365 if (n == 0) 1366 n = 1; 1367 sp += n; 1368 break; 1369 } 1370 cp++; 1371 n = 0; 1372 } 1373 } 1374 1375 static u_long 1376 swabl(u_long x) 1377 { 1378 swabst((u_char *)"l", (u_char *)&x); 1379 return (x); 1380 } 1381