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 1.9 2005/11/06 12:49:25 swildner 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 fprintf(stderr, "cannot open %s: %s\n", 140 _PATH_TTY, strerror(errno)); 141 terminal = fopen(_PATH_DEVNULL, "r"); 142 if (terminal == NULL) { 143 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 == 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 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 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 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 time_t c_date = tmpbuf.c_date; 404 fprintf(stderr, "Wrong dump date\n\tgot: %s", ctime(&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 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 time_t c_date = spcl.c_date; 511 time_t c_ddate = spcl.c_ddate; 512 513 fprintf(stdout, "Dump date: %s", ctime(&c_date)); 514 fprintf(stdout, "Dumped from: %s", 515 (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&c_ddate)); 516 if (spcl.c_host[0] == '\0') 517 return; 518 fprintf(stderr, "Level %ld dump of %s on %s:%s\n", 519 (long)spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev); 520 fprintf(stderr, "Label: %s\n", spcl.c_label); 521 } 522 523 int 524 extractfile(char *name) 525 { 526 int flags; 527 uid_t uid; 528 gid_t gid; 529 mode_t mode; 530 struct timeval timep[2]; 531 struct entry *ep; 532 533 curfile.name = name; 534 curfile.action = USING; 535 timep[0].tv_sec = curfile.dip->di_atime; 536 timep[0].tv_usec = curfile.dip->di_atimensec / 1000; 537 timep[1].tv_sec = curfile.dip->di_mtime; 538 timep[1].tv_usec = curfile.dip->di_mtimensec / 1000; 539 uid = curfile.dip->di_uid; 540 gid = curfile.dip->di_gid; 541 mode = curfile.dip->di_mode; 542 flags = curfile.dip->di_flags; 543 switch (mode & IFMT) { 544 545 default: 546 fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode); 547 skipfile(); 548 return (FAIL); 549 550 case IFSOCK: 551 vprintf(stdout, "skipped socket %s\n", name); 552 skipfile(); 553 return (GOOD); 554 555 case IFDIR: 556 if (mflag) { 557 ep = lookupname(name); 558 if (ep == NULL || ep->e_flags & EXTRACT) 559 panic("unextracted directory %s\n", name); 560 skipfile(); 561 return (GOOD); 562 } 563 vprintf(stdout, "extract file %s\n", name); 564 return (genliteraldir(name, curfile.ino)); 565 566 case IFLNK: 567 lnkbuf[0] = '\0'; 568 pathlen = 0; 569 getfile(xtrlnkfile, xtrlnkskip); 570 if (pathlen == 0) { 571 vprintf(stdout, 572 "%s: zero length symbolic link (ignored)\n", name); 573 return (GOOD); 574 } 575 if (linkit(lnkbuf, name, SYMLINK) == GOOD) { 576 lchown(name, uid, gid); 577 lchmod(name, mode); 578 lutimes(name, timep); 579 return (GOOD); 580 } 581 return (FAIL); 582 583 case IFIFO: 584 vprintf(stdout, "extract fifo %s\n", name); 585 if (Nflag) { 586 skipfile(); 587 return (GOOD); 588 } 589 if (uflag && !Nflag) 590 unlink(name); 591 if (mkfifo(name, mode) < 0) { 592 fprintf(stderr, "%s: cannot create fifo: %s\n", 593 name, strerror(errno)); 594 skipfile(); 595 return (FAIL); 596 } 597 chown(name, uid, gid); 598 chmod(name, mode); 599 utimes(name, timep); 600 chflags(name, flags); 601 skipfile(); 602 return (GOOD); 603 604 case IFCHR: 605 case IFBLK: 606 vprintf(stdout, "extract special file %s\n", name); 607 if (Nflag) { 608 skipfile(); 609 return (GOOD); 610 } 611 if (uflag) 612 unlink(name); 613 if (mknod(name, mode, (int)curfile.dip->di_rdev) < 0) { 614 fprintf(stderr, "%s: cannot create special file: %s\n", 615 name, strerror(errno)); 616 skipfile(); 617 return (FAIL); 618 } 619 chown(name, uid, gid); 620 chmod(name, mode); 621 utimes(name, timep); 622 chflags(name, flags); 623 skipfile(); 624 return (GOOD); 625 626 case IFREG: 627 vprintf(stdout, "extract file %s\n", name); 628 if (Nflag) { 629 skipfile(); 630 return (GOOD); 631 } 632 if (uflag) 633 unlink(name); 634 if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC, 635 0666)) < 0) { 636 fprintf(stderr, "%s: cannot create file: %s\n", 637 name, strerror(errno)); 638 skipfile(); 639 return (FAIL); 640 } 641 fchown(ofile, uid, gid); 642 fchmod(ofile, mode); 643 getfile(xtrfile, xtrskip); 644 close(ofile); 645 utimes(name, timep); 646 chflags(name, flags); 647 return (GOOD); 648 } 649 /* NOTREACHED */ 650 } 651 652 /* 653 * skip over bit maps on the tape 654 */ 655 void 656 skipmaps(void) 657 { 658 659 while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI) 660 skipfile(); 661 } 662 663 /* 664 * skip over a file on the tape 665 */ 666 void 667 skipfile(void) 668 { 669 670 curfile.action = SKIP; 671 getfile(xtrnull, xtrnull); 672 } 673 674 /* 675 * Extract a file from the tape. 676 * When an allocated block is found it is passed to the fill function; 677 * when an unallocated block (hole) is found, a zeroed buffer is passed 678 * to the skip function. 679 */ 680 void 681 getfile(void (*fill) (char *, long), void (*skip) (char *, long)) 682 { 683 int i; 684 int curblk = 0; 685 quad_t size = spcl.c_dinode.di_size; 686 static char clearedbuf[MAXBSIZE]; 687 char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE]; 688 char junk[TP_BSIZE]; 689 690 if (spcl.c_type == TS_END) 691 panic("ran off end of tape\n"); 692 if (spcl.c_magic != NFS_MAGIC) 693 panic("not at beginning of a file\n"); 694 if (!gettingfile && setjmp(restart) != 0) 695 return; 696 gettingfile++; 697 loop: 698 for (i = 0; i < spcl.c_count; i++) { 699 if (readmapflag || spcl.c_addr[i]) { 700 readtape(&buf[curblk++][0]); 701 if (curblk == fssize / TP_BSIZE) { 702 (*fill)((char *)buf, (long)(size > TP_BSIZE ? 703 fssize : (curblk - 1) * TP_BSIZE + size)); 704 curblk = 0; 705 } 706 } else { 707 if (curblk > 0) { 708 (*fill)((char *)buf, (long)(size > TP_BSIZE ? 709 curblk * TP_BSIZE : 710 (curblk - 1) * TP_BSIZE + size)); 711 curblk = 0; 712 } 713 (*skip)(clearedbuf, (long)(size > TP_BSIZE ? 714 TP_BSIZE : size)); 715 } 716 if ((size -= TP_BSIZE) <= 0) { 717 for (i++; i < spcl.c_count; i++) 718 if (readmapflag || spcl.c_addr[i]) 719 readtape(junk); 720 break; 721 } 722 } 723 if (gethead(&spcl) == GOOD && size > 0) { 724 if (spcl.c_type == TS_ADDR) 725 goto loop; 726 dprintf(stdout, 727 "Missing address (header) block for %s at %ld blocks\n", 728 curfile.name, blksread); 729 } 730 if (curblk > 0) 731 (*fill)((char *)buf, (long)((curblk * TP_BSIZE) + size)); 732 findinode(&spcl); 733 gettingfile = 0; 734 } 735 736 /* 737 * Write out the next block of a file. 738 */ 739 static void 740 xtrfile(char *buf, long size) 741 { 742 743 if (Nflag) 744 return; 745 if (write(ofile, buf, (int) size) == -1) { 746 fprintf(stderr, 747 "write error extracting inode %d, name %s\nwrite: %s\n", 748 curfile.ino, curfile.name, strerror(errno)); 749 } 750 } 751 752 /* 753 * Skip over a hole in a file. 754 */ 755 /* ARGSUSED */ 756 static void 757 xtrskip(char *buf, long size) 758 { 759 760 if (lseek(ofile, size, SEEK_CUR) == -1) { 761 fprintf(stderr, 762 "seek error extracting inode %d, name %s\nlseek: %s\n", 763 curfile.ino, curfile.name, strerror(errno)); 764 done(1); 765 } 766 } 767 768 /* 769 * Collect the next block of a symbolic link. 770 */ 771 static void 772 xtrlnkfile(char *buf, long size) 773 { 774 775 pathlen += size; 776 if (pathlen > MAXPATHLEN) { 777 fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n", 778 curfile.name, lnkbuf, buf, pathlen); 779 done(1); 780 } 781 strcat(lnkbuf, buf); 782 } 783 784 /* 785 * Skip over a hole in a symbolic link (should never happen). 786 */ 787 /* ARGSUSED */ 788 static void 789 xtrlnkskip(char *buf, long size) 790 { 791 792 fprintf(stderr, "unallocated block in symbolic link %s\n", 793 curfile.name); 794 done(1); 795 } 796 797 /* 798 * Collect the next block of a bit map. 799 */ 800 static void 801 xtrmap(char *buf, long size) 802 { 803 804 memmove(map, buf, size); 805 map += size; 806 } 807 808 /* 809 * Skip over a hole in a bit map (should never happen). 810 */ 811 /* ARGSUSED */ 812 static void 813 xtrmapskip(char *buf, long size) 814 { 815 816 panic("hole in map\n"); 817 map += size; 818 } 819 820 /* 821 * Noop, when an extraction function is not needed. 822 */ 823 /* ARGSUSED */ 824 void 825 xtrnull(char *buf, long size) 826 { 827 828 return; 829 } 830 831 /* 832 * Read TP_BSIZE blocks from the input. 833 * Handle read errors, and end of media. 834 */ 835 static void 836 readtape(char *buf) 837 { 838 long rd, newvol, i; 839 int cnt, seek_failed; 840 841 if (blkcnt < numtrec) { 842 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE); 843 blksread++; 844 tapeaddr++; 845 return; 846 } 847 for (i = 0; i < ntrec; i++) 848 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0; 849 if (numtrec == 0) 850 numtrec = ntrec; 851 cnt = ntrec * TP_BSIZE; 852 rd = 0; 853 getmore: 854 #ifdef RRESTORE 855 if (host) 856 i = rmtread(&tapebuf[rd], cnt); 857 else 858 #endif 859 i = read(mt, &tapebuf[rd], cnt); 860 /* 861 * Check for mid-tape short read error. 862 * If found, skip rest of buffer and start with the next. 863 */ 864 if (!pipein && numtrec < ntrec && i > 0) { 865 dprintf(stdout, "mid-media short read error.\n"); 866 numtrec = ntrec; 867 } 868 /* 869 * Handle partial block read. 870 */ 871 if (pipein && i == 0 && rd > 0) 872 i = rd; 873 else if (i > 0 && i != ntrec * TP_BSIZE) { 874 if (pipein) { 875 rd += i; 876 cnt -= i; 877 if (cnt > 0) 878 goto getmore; 879 i = rd; 880 } else { 881 /* 882 * Short read. Process the blocks read. 883 */ 884 if (i % TP_BSIZE != 0) 885 vprintf(stdout, 886 "partial block read: %ld should be %ld\n", 887 i, ntrec * TP_BSIZE); 888 numtrec = i / TP_BSIZE; 889 } 890 } 891 /* 892 * Handle read error. 893 */ 894 if (i < 0) { 895 fprintf(stderr, "Tape read error while "); 896 switch (curfile.action) { 897 default: 898 fprintf(stderr, "trying to set up tape\n"); 899 break; 900 case UNKNOWN: 901 fprintf(stderr, "trying to resynchronize\n"); 902 break; 903 case USING: 904 fprintf(stderr, "restoring %s\n", curfile.name); 905 break; 906 case SKIP: 907 fprintf(stderr, "skipping over inode %d\n", 908 curfile.ino); 909 break; 910 } 911 if (!yflag && !reply("continue")) 912 done(1); 913 i = ntrec * TP_BSIZE; 914 memset(tapebuf, 0, i); 915 #ifdef RRESTORE 916 if (host) 917 seek_failed = (rmtseek(i, 1) < 0); 918 else 919 #endif 920 seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1); 921 922 if (seek_failed) { 923 fprintf(stderr, 924 "continuation failed: %s\n", strerror(errno)); 925 done(1); 926 } 927 } 928 /* 929 * Handle end of tape. 930 */ 931 if (i == 0) { 932 vprintf(stdout, "End-of-tape encountered\n"); 933 if (!pipein) { 934 newvol = volno + 1; 935 volno = 0; 936 numtrec = 0; 937 getvol(newvol); 938 readtape(buf); 939 return; 940 } 941 if (rd % TP_BSIZE != 0) 942 panic("partial block read: %d should be %d\n", 943 rd, ntrec * TP_BSIZE); 944 terminateinput(); 945 memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE); 946 } 947 blkcnt = 0; 948 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE); 949 blksread++; 950 tapeaddr++; 951 } 952 953 static void 954 findtapeblksize(void) 955 { 956 long i; 957 958 for (i = 0; i < ntrec; i++) 959 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0; 960 blkcnt = 0; 961 #ifdef RRESTORE 962 if (host) 963 i = rmtread(tapebuf, ntrec * TP_BSIZE); 964 else 965 #endif 966 i = read(mt, tapebuf, ntrec * TP_BSIZE); 967 968 if (i <= 0) { 969 fprintf(stderr, "tape read error: %s\n", strerror(errno)); 970 done(1); 971 } 972 if (i % TP_BSIZE != 0) { 973 fprintf(stderr, "Tape block size (%ld) %s (%d)\n", 974 i, "is not a multiple of dump block size", TP_BSIZE); 975 done(1); 976 } 977 ntrec = i / TP_BSIZE; 978 numtrec = ntrec; 979 vprintf(stdout, "Tape block size is %ld\n", ntrec); 980 } 981 982 void 983 closemt(void) 984 { 985 986 if (mt < 0) 987 return; 988 #ifdef RRESTORE 989 if (host) 990 rmtclose(); 991 else 992 #endif 993 close(mt); 994 } 995 996 /* 997 * Read the next block from the tape. 998 * Check to see if it is one of several vintage headers. 999 * If it is an old style header, convert it to a new style header. 1000 * If it is not any valid header, return an error. 1001 */ 1002 static int 1003 gethead(struct s_spcl *buf) 1004 { 1005 long i; 1006 union { 1007 quad_t qval; 1008 int32_t val[2]; 1009 } qcvt; 1010 union u_ospcl { 1011 char dummy[TP_BSIZE]; 1012 struct s_ospcl { 1013 int32_t c_type; 1014 int32_t c_date; 1015 int32_t c_ddate; 1016 int32_t c_volume; 1017 int32_t c_tapea; 1018 u_short c_inumber; 1019 int32_t c_magic; 1020 int32_t c_checksum; 1021 struct odinode { 1022 unsigned short odi_mode; 1023 u_short odi_nlink; 1024 u_short odi_uid; 1025 u_short odi_gid; 1026 int32_t odi_size; 1027 int32_t odi_rdev; 1028 char odi_addr[36]; 1029 int32_t odi_atime; 1030 int32_t odi_mtime; 1031 int32_t odi_ctime; 1032 } c_dinode; 1033 int32_t c_count; 1034 char c_addr[256]; 1035 } s_ospcl; 1036 } u_ospcl; 1037 1038 if (!cvtflag) { 1039 readtape((char *)buf); 1040 if (buf->c_magic != NFS_MAGIC) { 1041 if (swabl(buf->c_magic) != NFS_MAGIC) 1042 return (FAIL); 1043 if (!Bcvt) { 1044 vprintf(stdout, "Note: Doing Byte swapping\n"); 1045 Bcvt = 1; 1046 } 1047 } 1048 if (checksum((int *)buf) == FAIL) 1049 return (FAIL); 1050 if (Bcvt) { 1051 swabst((u_char *)"8l4s31l", (u_char *)buf); 1052 swabst((u_char *)"l",(u_char *) &buf->c_level); 1053 swabst((u_char *)"2l",(u_char *) &buf->c_flags); 1054 } 1055 goto good; 1056 } 1057 readtape((char *)(&u_ospcl.s_ospcl)); 1058 memset(buf, 0, (long)TP_BSIZE); 1059 buf->c_type = u_ospcl.s_ospcl.c_type; 1060 buf->c_date = u_ospcl.s_ospcl.c_date; 1061 buf->c_ddate = u_ospcl.s_ospcl.c_ddate; 1062 buf->c_volume = u_ospcl.s_ospcl.c_volume; 1063 buf->c_tapea = u_ospcl.s_ospcl.c_tapea; 1064 buf->c_inumber = u_ospcl.s_ospcl.c_inumber; 1065 buf->c_checksum = u_ospcl.s_ospcl.c_checksum; 1066 buf->c_magic = u_ospcl.s_ospcl.c_magic; 1067 buf->c_dinode.di_mode = u_ospcl.s_ospcl.c_dinode.odi_mode; 1068 buf->c_dinode.di_nlink = u_ospcl.s_ospcl.c_dinode.odi_nlink; 1069 buf->c_dinode.di_uid = u_ospcl.s_ospcl.c_dinode.odi_uid; 1070 buf->c_dinode.di_gid = u_ospcl.s_ospcl.c_dinode.odi_gid; 1071 buf->c_dinode.di_size = u_ospcl.s_ospcl.c_dinode.odi_size; 1072 buf->c_dinode.di_rdev = u_ospcl.s_ospcl.c_dinode.odi_rdev; 1073 buf->c_dinode.di_atime = u_ospcl.s_ospcl.c_dinode.odi_atime; 1074 buf->c_dinode.di_mtime = u_ospcl.s_ospcl.c_dinode.odi_mtime; 1075 buf->c_dinode.di_ctime = u_ospcl.s_ospcl.c_dinode.odi_ctime; 1076 buf->c_count = u_ospcl.s_ospcl.c_count; 1077 memmove(buf->c_addr, u_ospcl.s_ospcl.c_addr, (long)256); 1078 if (u_ospcl.s_ospcl.c_magic != OFS_MAGIC || 1079 checksum((int *)(&u_ospcl.s_ospcl)) == FAIL) 1080 return(FAIL); 1081 buf->c_magic = NFS_MAGIC; 1082 1083 good: 1084 if ((buf->c_dinode.di_size == 0 || buf->c_dinode.di_size > 0xfffffff) && 1085 (buf->c_dinode.di_mode & IFMT) == IFDIR && Qcvt == 0) { 1086 qcvt.qval = buf->c_dinode.di_size; 1087 if (qcvt.val[0] || qcvt.val[1]) { 1088 printf("Note: Doing Quad swapping\n"); 1089 Qcvt = 1; 1090 } 1091 } 1092 if (Qcvt) { 1093 qcvt.qval = buf->c_dinode.di_size; 1094 i = qcvt.val[1]; 1095 qcvt.val[1] = qcvt.val[0]; 1096 qcvt.val[0] = i; 1097 buf->c_dinode.di_size = qcvt.qval; 1098 } 1099 readmapflag = 0; 1100 1101 switch (buf->c_type) { 1102 1103 case TS_CLRI: 1104 case TS_BITS: 1105 /* 1106 * Have to patch up missing information in bit map headers 1107 */ 1108 buf->c_inumber = 0; 1109 buf->c_dinode.di_size = buf->c_count * TP_BSIZE; 1110 if (buf->c_count > TP_NINDIR) 1111 readmapflag = 1; 1112 else 1113 for (i = 0; i < buf->c_count; i++) 1114 buf->c_addr[i]++; 1115 break; 1116 1117 case TS_TAPE: 1118 if ((buf->c_flags & DR_NEWINODEFMT) == 0) 1119 oldinofmt = 1; 1120 /* fall through */ 1121 case TS_END: 1122 buf->c_inumber = 0; 1123 break; 1124 1125 case TS_INODE: 1126 case TS_ADDR: 1127 break; 1128 1129 default: 1130 panic("gethead: unknown inode type %d\n", buf->c_type); 1131 break; 1132 } 1133 /* 1134 * If we are restoring a filesystem with old format inodes, 1135 * copy the uid/gid to the new location. 1136 */ 1137 if (oldinofmt) { 1138 buf->c_dinode.di_uid = buf->c_dinode.di_ouid; 1139 buf->c_dinode.di_gid = buf->c_dinode.di_ogid; 1140 } 1141 tapeaddr = buf->c_tapea; 1142 if (dflag) 1143 accthdr(buf); 1144 return(GOOD); 1145 } 1146 1147 /* 1148 * Check that a header is where it belongs and predict the next header 1149 */ 1150 static void 1151 accthdr(struct s_spcl *header) 1152 { 1153 static ufs1_ino_t previno = 0x7fffffff; 1154 static int prevtype; 1155 static long predict; 1156 long blks, i; 1157 1158 if (header->c_type == TS_TAPE) { 1159 fprintf(stderr, "Volume header (%s inode format) ", 1160 oldinofmt ? "old" : "new"); 1161 if (header->c_firstrec) 1162 fprintf(stderr, "begins with record %ld", 1163 (long)header->c_firstrec); 1164 fprintf(stderr, "\n"); 1165 previno = 0x7fffffff; 1166 return; 1167 } 1168 if (previno == 0x7fffffff) 1169 goto newcalc; 1170 switch (prevtype) { 1171 case TS_BITS: 1172 fprintf(stderr, "Dumped inodes map header"); 1173 break; 1174 case TS_CLRI: 1175 fprintf(stderr, "Used inodes map header"); 1176 break; 1177 case TS_INODE: 1178 fprintf(stderr, "File header, ino %d", previno); 1179 break; 1180 case TS_ADDR: 1181 fprintf(stderr, "File continuation header, ino %d", previno); 1182 break; 1183 case TS_END: 1184 fprintf(stderr, "End of tape header"); 1185 break; 1186 } 1187 if (predict != blksread - 1) 1188 fprintf(stderr, "; predicted %ld blocks, got %ld blocks", 1189 predict, blksread - 1); 1190 fprintf(stderr, "\n"); 1191 newcalc: 1192 blks = 0; 1193 if (header->c_type != TS_END) 1194 for (i = 0; i < header->c_count; i++) 1195 if (readmapflag || header->c_addr[i] != 0) 1196 blks++; 1197 predict = blks; 1198 blksread = 0; 1199 prevtype = header->c_type; 1200 previno = header->c_inumber; 1201 } 1202 1203 /* 1204 * Find an inode header. 1205 * Complain if had to skip. 1206 */ 1207 static void 1208 findinode(struct s_spcl *header) 1209 { 1210 static long skipcnt = 0; 1211 long i; 1212 char buf[TP_BSIZE]; 1213 int htype; 1214 1215 curfile.name = "<name unknown>"; 1216 curfile.action = UNKNOWN; 1217 curfile.dip = NULL; 1218 curfile.ino = 0; 1219 do { 1220 if (header->c_magic != NFS_MAGIC) { 1221 skipcnt++; 1222 while (gethead(header) == FAIL || 1223 header->c_date != dumpdate) 1224 skipcnt++; 1225 } 1226 htype = header->c_type; 1227 switch (htype) { 1228 1229 case TS_ADDR: 1230 /* 1231 * Skip up to the beginning of the next record 1232 */ 1233 for (i = 0; i < header->c_count; i++) 1234 if (header->c_addr[i]) 1235 readtape(buf); 1236 while (gethead(header) == FAIL || 1237 header->c_date != dumpdate) 1238 skipcnt++; 1239 break; 1240 1241 case TS_INODE: 1242 curfile.dip = &header->c_dinode; 1243 curfile.ino = header->c_inumber; 1244 break; 1245 1246 case TS_END: 1247 /* If we missed some tapes, get another volume. */ 1248 if (tapesread & (tapesread + 1)) { 1249 getvol(0); 1250 continue; 1251 } 1252 curfile.ino = maxino; 1253 break; 1254 1255 case TS_CLRI: 1256 curfile.name = "<file removal list>"; 1257 break; 1258 1259 case TS_BITS: 1260 curfile.name = "<file dump list>"; 1261 break; 1262 1263 case TS_TAPE: 1264 panic("unexpected tape header\n"); 1265 /* NOTREACHED */ 1266 1267 default: 1268 panic("unknown tape header type %d\n", spcl.c_type); 1269 /* NOTREACHED */ 1270 1271 } 1272 } while (htype == TS_ADDR); 1273 if (skipcnt > 0) 1274 fprintf(stderr, "resync restore, skipped %ld blocks\n", 1275 skipcnt); 1276 skipcnt = 0; 1277 } 1278 1279 static int 1280 checksum(int *buf) 1281 { 1282 int i, j; 1283 1284 j = sizeof(union u_spcl) / sizeof(int); 1285 i = 0; 1286 if(!Bcvt) { 1287 do 1288 i += *buf++; 1289 while (--j); 1290 } else { 1291 /* What happens if we want to read restore tapes 1292 for a 16bit int machine??? */ 1293 do 1294 i += swabl(*buf++); 1295 while (--j); 1296 } 1297 1298 if (i != CHECKSUM) { 1299 fprintf(stderr, "Checksum error %o, inode %d file %s\n", i, 1300 curfile.ino, curfile.name); 1301 return(FAIL); 1302 } 1303 return(GOOD); 1304 } 1305 1306 #ifdef RRESTORE 1307 #include <stdarg.h> 1308 1309 void 1310 msg(const char *fmt, ...) 1311 { 1312 va_list ap; 1313 va_start(ap, fmt); 1314 vfprintf(stderr, fmt, ap); 1315 va_end(ap); 1316 } 1317 #endif /* RRESTORE */ 1318 1319 static u_char * 1320 swabshort(u_char *sp, int n) 1321 { 1322 char c; 1323 1324 while (--n >= 0) { 1325 c = sp[0]; sp[0] = sp[1]; sp[1] = c; 1326 sp += 2; 1327 } 1328 return (sp); 1329 } 1330 1331 static u_char * 1332 swablong(u_char *sp, int n) 1333 { 1334 char c; 1335 1336 while (--n >= 0) { 1337 c = sp[0]; sp[0] = sp[3]; sp[3] = c; 1338 c = sp[2]; sp[2] = sp[1]; sp[1] = c; 1339 sp += 4; 1340 } 1341 return (sp); 1342 } 1343 1344 void 1345 swabst(u_char *cp, u_char *sp) 1346 { 1347 int n = 0; 1348 1349 while (*cp) { 1350 switch (*cp) { 1351 case '0': case '1': case '2': case '3': case '4': 1352 case '5': case '6': case '7': case '8': case '9': 1353 n = (n * 10) + (*cp++ - '0'); 1354 continue; 1355 1356 case 's': case 'w': case 'h': 1357 if (n == 0) 1358 n = 1; 1359 sp = swabshort(sp, n); 1360 break; 1361 1362 case 'l': 1363 if (n == 0) 1364 n = 1; 1365 sp = swablong(sp, n); 1366 break; 1367 1368 default: /* Any other character, like 'b' counts as byte. */ 1369 if (n == 0) 1370 n = 1; 1371 sp += n; 1372 break; 1373 } 1374 cp++; 1375 n = 0; 1376 } 1377 } 1378 1379 static u_long 1380 swabl(u_long x) 1381 { 1382 swabst((u_char *)"l", (u_char *)&x); 1383 return (x); 1384 } 1385