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 */ 37 38 #include <sys/param.h> 39 #include <sys/file.h> 40 #include <sys/mtio.h> 41 #include <sys/stat.h> 42 #include <sys/time.h> 43 44 #include <vfs/ufs/dinode.h> 45 #include <protocols/dumprestore.h> 46 47 #include <errno.h> 48 #include <paths.h> 49 #include <setjmp.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <time.h> 54 #include <unistd.h> 55 56 #include "restore.h" 57 #include "extern.h" 58 59 static long fssize = MAXBSIZE; 60 static int mt = -1; 61 static int pipein = 0; 62 static char *magtape; 63 static int blkcnt; 64 static int numtrec; 65 static char *tapebuf; 66 static union u_spcl endoftapemark; 67 static long blksread; /* blocks read since last header */ 68 static long tapeaddr = 0; /* current TP_BSIZE tape record */ 69 static long tapesread; 70 static jmp_buf restart; 71 static int gettingfile = 0; /* restart has a valid frame */ 72 static char *host = NULL; 73 74 static int ofile; 75 static char *map; 76 static char lnkbuf[MAXPATHLEN + 1]; 77 static int pathlen; 78 79 int oldinofmt; /* old inode format conversion required */ 80 int Bcvt; /* Swap Bytes (for CCI or sun) */ 81 static int Qcvt; /* Swap quads (for sun) */ 82 83 #define FLUSHTAPEBUF() blkcnt = ntrec + 1 84 85 static void accthdr(struct s_spcl *); 86 static int checksum(int *); 87 static void findinode(struct s_spcl *); 88 static void findtapeblksize(void); 89 static int gethead(struct s_spcl *); 90 static void readtape(char *); 91 static void setdumpnum(void); 92 static u_long swabl(u_long); 93 static u_char *swablong(u_char *, int); 94 static u_char *swabshort(u_char *, int); 95 static void terminateinput(void); 96 static void xtrfile(char *, size_t); 97 static void xtrlnkfile(char *, size_t); 98 static void xtrlnkskip(char *, size_t); 99 static void xtrmap(char *, size_t); 100 static void xtrmapskip(char *, size_t); 101 static void xtrskip(char *, size_t); 102 103 static int readmapflag; 104 105 /* 106 * Set up an input source 107 */ 108 void 109 setinput(char *source) 110 { 111 FLUSHTAPEBUF(); 112 if (bflag) 113 newtapebuf(ntrec); 114 else 115 newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC); 116 terminal = stdin; 117 118 #ifdef RRESTORE 119 if (strchr(source, ':')) { 120 host = source; 121 source = strchr(host, ':'); 122 *source++ = '\0'; 123 if (rmthost(host) == 0) 124 done(1); 125 } else 126 #endif 127 if (strcmp(source, "-") == 0) { 128 /* 129 * Since input is coming from a pipe we must establish 130 * our own connection to the terminal. 131 */ 132 terminal = fopen(_PATH_TTY, "r"); 133 if (terminal == NULL) { 134 fprintf(stderr, "cannot open %s: %s\n", 135 _PATH_TTY, strerror(errno)); 136 terminal = fopen(_PATH_DEVNULL, "r"); 137 if (terminal == NULL) { 138 fprintf(stderr, "cannot open %s: %s\n", 139 _PATH_DEVNULL, strerror(errno)); 140 done(1); 141 } 142 } 143 pipein++; 144 } 145 setuid(getuid()); /* no longer need or want root privileges */ 146 magtape = strdup(source); 147 if (magtape == NULL) { 148 fprintf(stderr, "Cannot allocate space for magtape buffer\n"); 149 done(1); 150 } 151 } 152 153 void 154 newtapebuf(long size) 155 { 156 static long tapebufsize = -1; 157 158 ntrec = size; 159 if (size <= tapebufsize) 160 return; 161 if (tapebuf != NULL) 162 free(tapebuf); 163 tapebuf = malloc(size * TP_BSIZE); 164 if (tapebuf == NULL) { 165 fprintf(stderr, "Cannot allocate space for tape buffer\n"); 166 done(1); 167 } 168 tapebufsize = size; 169 } 170 171 /* 172 * Verify that the tape drive can be accessed and 173 * that it actually is a dump tape. 174 */ 175 void 176 setup(void) 177 { 178 int i, j, *ip; 179 struct stat stbuf; 180 181 vprintf(stdout, "Verify tape and initialize maps\n"); 182 #ifdef RRESTORE 183 if (host) 184 mt = rmtopen(magtape, 0); 185 else 186 #endif 187 if (pipein) 188 mt = 0; 189 else 190 mt = open(magtape, O_RDONLY, 0); 191 if (mt < 0) { 192 fprintf(stderr, "%s: %s\n", magtape, strerror(errno)); 193 done(1); 194 } 195 volno = 1; 196 setdumpnum(); 197 FLUSHTAPEBUF(); 198 if (!pipein && !bflag) 199 findtapeblksize(); 200 if (gethead(&spcl) == FAIL) { 201 blkcnt--; /* push back this block */ 202 blksread--; 203 cvtflag++; 204 if (gethead(&spcl) == FAIL) { 205 fprintf(stderr, "Tape is not a dump tape\n"); 206 done(1); 207 } 208 fprintf(stderr, "Converting to new file system format.\n"); 209 } 210 if (pipein) { 211 endoftapemark.s_spcl.c_magic = cvtflag ? OFS_MAGIC : NFS_MAGIC; 212 endoftapemark.s_spcl.c_type = TS_END; 213 ip = (int *)&endoftapemark; 214 j = sizeof(union u_spcl) / sizeof(int); 215 i = 0; 216 do 217 i += *ip++; 218 while (--j); 219 endoftapemark.s_spcl.c_checksum = CHECKSUM - i; 220 } 221 if (vflag || command == 't') 222 printdumpinfo(); 223 dumptime = spcl.c_ddate; 224 dumpdate = spcl.c_date; 225 if (stat(".", &stbuf) < 0) { 226 fprintf(stderr, "cannot stat .: %s\n", strerror(errno)); 227 done(1); 228 } 229 if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE ) 230 fssize = TP_BSIZE; 231 if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE) 232 fssize = stbuf.st_blksize; 233 if (((fssize - 1) & fssize) != 0) { 234 fprintf(stderr, "bad block size %ld\n", fssize); 235 done(1); 236 } 237 if (spcl.c_volume != 1) { 238 fprintf(stderr, "Tape is not volume 1 of the dump\n"); 239 done(1); 240 } 241 if (gethead(&spcl) == FAIL) { 242 dprintf(stdout, "header read failed at %ld blocks\n", blksread); 243 panic("no header after volume mark!\n"); 244 } 245 findinode(&spcl); 246 if (spcl.c_type != TS_CLRI) { 247 fprintf(stderr, "Cannot find file removal list\n"); 248 done(1); 249 } 250 maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1; 251 dprintf(stdout, "maxino = %d\n", maxino); 252 map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY)); 253 if (map == NULL) 254 panic("no memory for active inode map\n"); 255 usedinomap = map; 256 curfile.action = USING; 257 getfile(xtrmap, xtrmapskip); 258 if (spcl.c_type != TS_BITS) { 259 fprintf(stderr, "Cannot find file dump list\n"); 260 done(1); 261 } 262 map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY)); 263 if (map == NULL) 264 panic("no memory for file dump list\n"); 265 dumpmap = map; 266 curfile.action = USING; 267 getfile(xtrmap, xtrmapskip); 268 /* 269 * If there may be whiteout entries on the tape, pretend that the 270 * whiteout inode exists, so that the whiteout entries can be 271 * extracted. 272 */ 273 if (oldinofmt == 0) 274 SETINO(UFS_WINO, dumpmap); 275 /* 'r' restores don't call getvol() for tape 1, so mark it as read. */ 276 if (command == 'r') 277 tapesread = 1; 278 } 279 280 /* 281 * Prompt user to load a new dump volume. 282 * "Nextvol" is the next suggested volume to use. 283 * This suggested volume is enforced when doing full 284 * or incremental restores, but can be overridden by 285 * the user when only extracting a subset of the files. 286 */ 287 void 288 getvol(long nextvol) 289 { 290 long newvol = 0, prevtapea, savecnt, i; 291 union u_spcl tmpspcl; 292 # define tmpbuf tmpspcl.s_spcl 293 char buf[TP_BSIZE]; 294 295 if (nextvol == 1) { 296 tapesread = 0; 297 gettingfile = 0; 298 } 299 prevtapea = tapeaddr; 300 savecnt = blksread; 301 if (pipein) { 302 if (nextvol != 1) { 303 panic("Changing volumes on pipe input?\n"); 304 /* Avoid looping if we couldn't ask the user. */ 305 if (yflag || ferror(terminal) || feof(terminal)) 306 done(1); 307 } 308 if (volno == 1) 309 return; 310 goto gethdr; 311 } 312 again: 313 if (pipein) 314 done(1); /* pipes do not get a second chance */ 315 if (command == 'R' || command == 'r' || curfile.action != SKIP) 316 newvol = nextvol; 317 else 318 newvol = 0; 319 while (newvol <= 0) { 320 if (tapesread == 0) { 321 fprintf(stderr, "%s%s%s%s%s%s%s", 322 "You have not read any tapes yet.\n", 323 "If you are extracting just a few files,", 324 " start with the last volume\n", 325 "and work towards the first; restore", 326 " can quickly skip tapes that\n", 327 "have no further files to extract.", 328 " Otherwise, begin with volume 1.\n"); 329 } else { 330 fprintf(stderr, "You have read volumes"); 331 strcpy(buf, ": "); 332 for (i = 0; i < 32; i++) 333 if (tapesread & (1 << i)) { 334 fprintf(stderr, "%s%ld", buf, i + 1); 335 strcpy(buf, ", "); 336 } 337 fprintf(stderr, "\n"); 338 } 339 do { 340 fprintf(stderr, "Specify next volume #: "); 341 fflush(stderr); 342 if (fgets(buf, BUFSIZ, terminal) == NULL) 343 done(1); 344 } while (buf[0] == '\n'); 345 newvol = atoi(buf); 346 if (newvol <= 0) { 347 fprintf(stderr, 348 "Volume numbers are positive numerics\n"); 349 } 350 } 351 if (newvol == volno) { 352 tapesread |= 1 << (volno - 1); 353 return; 354 } 355 closemt(); 356 fprintf(stderr, "Mount tape volume %ld\n", newvol); 357 fprintf(stderr, "Enter ``none'' if there are no more tapes\n"); 358 fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape); 359 fflush(stderr); 360 if (fgets(buf, BUFSIZ, terminal) == NULL) 361 done(1); 362 if (!strcmp(buf, "none\n")) { 363 terminateinput(); 364 return; 365 } 366 if (buf[0] != '\n') { 367 strcpy(magtape, buf); 368 magtape[strlen(magtape) - 1] = '\0'; 369 } 370 #ifdef RRESTORE 371 if (host) 372 mt = rmtopen(magtape, 0); 373 else 374 #endif 375 mt = open(magtape, O_RDONLY, 0); 376 377 if (mt == -1) { 378 fprintf(stderr, "Cannot open %s\n", magtape); 379 volno = -1; 380 goto again; 381 } 382 gethdr: 383 volno = newvol; 384 setdumpnum(); 385 FLUSHTAPEBUF(); 386 if (gethead(&tmpbuf) == FAIL) { 387 dprintf(stdout, "header read failed at %ld blocks\n", blksread); 388 fprintf(stderr, "tape is not dump tape\n"); 389 volno = 0; 390 goto again; 391 } 392 if (tmpbuf.c_volume != volno) { 393 fprintf(stderr, "Wrong volume (%ld)\n", (long)tmpbuf.c_volume); 394 volno = 0; 395 goto again; 396 } 397 if (tmpbuf.c_date != dumpdate || tmpbuf.c_ddate != dumptime) { 398 time_t c_date = tmpbuf.c_date; 399 fprintf(stderr, "Wrong dump date\n\tgot: %s", ctime(&c_date)); 400 fprintf(stderr, "\twanted: %s", ctime(&dumpdate)); 401 volno = 0; 402 goto again; 403 } 404 tapesread |= 1 << (volno - 1); 405 blksread = savecnt; 406 /* 407 * If continuing from the previous volume, skip over any 408 * blocks read already at the end of the previous volume. 409 * 410 * If coming to this volume at random, skip to the beginning 411 * of the next record. 412 */ 413 dprintf(stdout, "last rec %ld, tape starts with %ld\n", prevtapea, 414 (long)tmpbuf.c_tapea); 415 if (tmpbuf.c_type == TS_TAPE && (tmpbuf.c_flags & DR_NEWHEADER)) { 416 if (curfile.action != USING) { 417 /* 418 * XXX Dump incorrectly sets c_count to 1 in the 419 * volume header of the first tape, so ignore 420 * c_count when volno == 1. 421 */ 422 if (volno != 1) 423 for (i = tmpbuf.c_count; i > 0; i--) 424 readtape(buf); 425 } else if (tmpbuf.c_tapea <= prevtapea) { 426 /* 427 * Normally the value of c_tapea in the volume 428 * header is the record number of the header itself. 429 * However in the volume header following an EOT- 430 * terminated tape, it is the record number of the 431 * first continuation data block (dump bug?). 432 * 433 * The next record we want is `prevtapea + 1'. 434 */ 435 i = prevtapea + 1 - tmpbuf.c_tapea; 436 dprintf(stderr, "Skipping %ld duplicate record%s.\n", 437 i, i > 1 ? "s" : ""); 438 while (--i >= 0) 439 readtape(buf); 440 } 441 } 442 if (curfile.action == USING) { 443 if (volno == 1) 444 panic("active file into volume 1\n"); 445 return; 446 } 447 gethead(&spcl); 448 findinode(&spcl); 449 if (gettingfile) { 450 gettingfile = 0; 451 longjmp(restart, 1); 452 } 453 } 454 455 /* 456 * Handle unexpected EOF. 457 */ 458 static void 459 terminateinput(void) 460 { 461 462 if (gettingfile && curfile.action == USING) { 463 printf("Warning: %s %s\n", 464 "End-of-input encountered while extracting", curfile.name); 465 } 466 curfile.name = "<name unknown>"; 467 curfile.action = UNKNOWN; 468 curfile.dip = NULL; 469 curfile.ino = maxino; 470 if (gettingfile) { 471 gettingfile = 0; 472 longjmp(restart, 1); 473 } 474 } 475 476 /* 477 * handle multiple dumps per tape by skipping forward to the 478 * appropriate one. 479 */ 480 static void 481 setdumpnum(void) 482 { 483 struct mtop tcom; 484 485 if (dumpnum == 1 || volno != 1) 486 return; 487 if (pipein) { 488 fprintf(stderr, "Cannot have multiple dumps on pipe input\n"); 489 done(1); 490 } 491 tcom.mt_op = MTFSF; 492 tcom.mt_count = dumpnum - 1; 493 #ifdef RRESTORE 494 if (host) 495 rmtioctl(MTFSF, dumpnum - 1); 496 else 497 #endif 498 if (ioctl(mt, MTIOCTOP, (char *)&tcom) < 0) 499 fprintf(stderr, "ioctl MTFSF: %s\n", strerror(errno)); 500 } 501 502 void 503 printdumpinfo(void) 504 { 505 time_t c_date = spcl.c_date; 506 time_t c_ddate = spcl.c_ddate; 507 508 fprintf(stdout, "Dump date: %s", ctime(&c_date)); 509 fprintf(stdout, "Dumped from: %s", 510 (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&c_ddate)); 511 if (spcl.c_host[0] == '\0') 512 return; 513 fprintf(stderr, "Level %ld dump of %s on %s:%s\n", 514 (long)spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev); 515 fprintf(stderr, "Label: %s\n", spcl.c_label); 516 } 517 518 int 519 extractfile(char *name) 520 { 521 int flags; 522 uid_t uid; 523 gid_t gid; 524 mode_t mode; 525 struct timeval timep[2]; 526 struct entry *ep; 527 528 curfile.name = name; 529 curfile.action = USING; 530 timep[0].tv_sec = curfile.dip->di_atime; 531 timep[0].tv_usec = curfile.dip->di_atimensec / 1000; 532 timep[1].tv_sec = curfile.dip->di_mtime; 533 timep[1].tv_usec = curfile.dip->di_mtimensec / 1000; 534 uid = curfile.dip->di_uid; 535 gid = curfile.dip->di_gid; 536 mode = curfile.dip->di_mode; 537 flags = curfile.dip->di_flags; 538 switch (mode & IFMT) { 539 540 default: 541 fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode); 542 skipfile(); 543 return (FAIL); 544 545 case IFSOCK: 546 vprintf(stdout, "skipped socket %s\n", name); 547 skipfile(); 548 return (GOOD); 549 550 case IFDIR: 551 if (mflag) { 552 ep = lookupname(name); 553 if (ep == NULL || ep->e_flags & EXTRACT) 554 panic("unextracted directory %s\n", name); 555 skipfile(); 556 return (GOOD); 557 } 558 vprintf(stdout, "extract file %s\n", name); 559 return (genliteraldir(name, curfile.ino)); 560 561 case IFLNK: 562 lnkbuf[0] = '\0'; 563 pathlen = 0; 564 getfile(xtrlnkfile, xtrlnkskip); 565 if (pathlen == 0) { 566 vprintf(stdout, 567 "%s: zero length symbolic link (ignored)\n", name); 568 return (GOOD); 569 } 570 if (linkit(lnkbuf, name, SYMLINK) == GOOD) { 571 lchown(name, uid, gid); 572 lchmod(name, mode); 573 lutimes(name, timep); 574 return (GOOD); 575 } 576 return (FAIL); 577 578 case IFIFO: 579 vprintf(stdout, "extract fifo %s\n", name); 580 if (Nflag) { 581 skipfile(); 582 return (GOOD); 583 } 584 if (uflag && !Nflag) 585 unlink(name); 586 if (mkfifo(name, mode) < 0) { 587 fprintf(stderr, "%s: cannot create fifo: %s\n", 588 name, strerror(errno)); 589 skipfile(); 590 return (FAIL); 591 } 592 chown(name, uid, gid); 593 chmod(name, mode); 594 utimes(name, timep); 595 chflags(name, flags); 596 skipfile(); 597 return (GOOD); 598 599 case IFCHR: 600 case IFBLK: 601 vprintf(stdout, "extract special file %s\n", name); 602 if (Nflag) { 603 skipfile(); 604 return (GOOD); 605 } 606 if (uflag) 607 unlink(name); 608 if (mknod(name, mode, (int)curfile.dip->di_rdev) < 0) { 609 fprintf(stderr, "%s: cannot create special file: %s\n", 610 name, strerror(errno)); 611 skipfile(); 612 return (FAIL); 613 } 614 chown(name, uid, gid); 615 chmod(name, mode); 616 utimes(name, timep); 617 chflags(name, flags); 618 skipfile(); 619 return (GOOD); 620 621 case IFREG: 622 vprintf(stdout, "extract file %s\n", name); 623 if (Nflag) { 624 skipfile(); 625 return (GOOD); 626 } 627 if (uflag) 628 unlink(name); 629 if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC, 630 0666)) < 0) { 631 fprintf(stderr, "%s: cannot create file: %s\n", 632 name, strerror(errno)); 633 skipfile(); 634 return (FAIL); 635 } 636 fchown(ofile, uid, gid); 637 fchmod(ofile, mode); 638 getfile(xtrfile, xtrskip); 639 close(ofile); 640 utimes(name, timep); 641 chflags(name, flags); 642 return (GOOD); 643 } 644 /* NOTREACHED */ 645 } 646 647 /* 648 * skip over bit maps on the tape 649 */ 650 void 651 skipmaps(void) 652 { 653 654 while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI) 655 skipfile(); 656 } 657 658 /* 659 * skip over a file on the tape 660 */ 661 void 662 skipfile(void) 663 { 664 665 curfile.action = SKIP; 666 getfile(xtrnull, xtrnull); 667 } 668 669 /* 670 * Extract a file from the tape. 671 * When an allocated block is found it is passed to the fill function; 672 * when an unallocated block (hole) is found, a zeroed buffer is passed 673 * to the skip function. 674 */ 675 void 676 getfile(void (*fill)(char *, size_t), void (*skip)(char *, size_t)) 677 { 678 int i; 679 volatile int curblk = 0; /* avoid -Wclobbered */ 680 volatile quad_t size = spcl.c_dinode.di_size; 681 static char clearedbuf[MAXBSIZE]; 682 char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE]; 683 char junk[TP_BSIZE]; 684 685 if (spcl.c_type == TS_END) 686 panic("ran off end of tape\n"); 687 if (spcl.c_magic != NFS_MAGIC) 688 panic("not at beginning of a file\n"); 689 if (!gettingfile && setjmp(restart) != 0) 690 return; 691 gettingfile++; 692 loop: 693 for (i = 0; i < spcl.c_count; i++) { 694 if (readmapflag || spcl.c_addr[i]) { 695 readtape(&buf[curblk++][0]); 696 if (curblk == fssize / TP_BSIZE) { 697 (*fill)((char *)buf, (long)(size > TP_BSIZE ? 698 fssize : (curblk - 1) * TP_BSIZE + size)); 699 curblk = 0; 700 } 701 } else { 702 if (curblk > 0) { 703 (*fill)((char *)buf, (long)(size > TP_BSIZE ? 704 curblk * TP_BSIZE : 705 (curblk - 1) * TP_BSIZE + size)); 706 curblk = 0; 707 } 708 (*skip)(clearedbuf, (long)(size > TP_BSIZE ? 709 TP_BSIZE : size)); 710 } 711 if ((size -= TP_BSIZE) <= 0) { 712 for (i++; i < spcl.c_count; i++) 713 if (readmapflag || spcl.c_addr[i]) 714 readtape(junk); 715 break; 716 } 717 } 718 if (gethead(&spcl) == GOOD && size > 0) { 719 if (spcl.c_type == TS_ADDR) 720 goto loop; 721 dprintf(stdout, 722 "Missing address (header) block for %s at %ld blocks\n", 723 curfile.name, blksread); 724 } 725 if (curblk > 0) 726 (*fill)((char *)buf, (long)((curblk * TP_BSIZE) + size)); 727 findinode(&spcl); 728 gettingfile = 0; 729 } 730 731 /* 732 * Write out the next block of a file. 733 */ 734 static void 735 xtrfile(char *buf, size_t size) 736 { 737 738 if (Nflag) 739 return; 740 if (write(ofile, buf, (int) size) == -1) { 741 fprintf(stderr, 742 "write error extracting inode %ju, name %s\nwrite: %s\n", 743 (uintmax_t)curfile.ino, curfile.name, strerror(errno)); 744 } 745 } 746 747 /* 748 * Skip over a hole in a file. 749 */ 750 /* ARGSUSED */ 751 static void 752 xtrskip(char *buf __unused, size_t size) 753 { 754 755 if (lseek(ofile, size, SEEK_CUR) == -1) { 756 fprintf(stderr, 757 "seek error extracting inode %ju, name %s\nlseek: %s\n", 758 (uintmax_t)curfile.ino, curfile.name, strerror(errno)); 759 done(1); 760 } 761 } 762 763 /* 764 * Collect the next block of a symbolic link. 765 */ 766 static void 767 xtrlnkfile(char *buf, size_t size) 768 { 769 770 pathlen += size; 771 if (pathlen > MAXPATHLEN) { 772 fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n", 773 curfile.name, lnkbuf, buf, pathlen); 774 done(1); 775 } 776 strcat(lnkbuf, buf); 777 } 778 779 /* 780 * Skip over a hole in a symbolic link (should never happen). 781 */ 782 /* ARGSUSED */ 783 static void 784 xtrlnkskip(char *buf __unused, size_t size __unused) 785 { 786 787 fprintf(stderr, "unallocated block in symbolic link %s\n", 788 curfile.name); 789 done(1); 790 } 791 792 /* 793 * Collect the next block of a bit map. 794 */ 795 static void 796 xtrmap(char *buf, size_t size) 797 { 798 799 memmove(map, buf, size); 800 map += size; 801 } 802 803 /* 804 * Skip over a hole in a bit map (should never happen). 805 */ 806 /* ARGSUSED */ 807 static void 808 xtrmapskip(char *buf __unused, size_t size) 809 { 810 811 panic("hole in map\n"); 812 map += size; 813 } 814 815 /* 816 * Noop, when an extraction function is not needed. 817 */ 818 /* ARGSUSED */ 819 void 820 xtrnull(char *buf __unused, size_t size __unused) 821 { 822 823 return; 824 } 825 826 /* 827 * Read TP_BSIZE blocks from the input. 828 * Handle read errors, and end of media. 829 */ 830 static void 831 readtape(char *buf) 832 { 833 long rd, newvol, i; 834 int cnt, seek_failed; 835 836 if (blkcnt < numtrec) { 837 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE); 838 blksread++; 839 tapeaddr++; 840 return; 841 } 842 for (i = 0; i < ntrec; i++) 843 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0; 844 if (numtrec == 0) 845 numtrec = ntrec; 846 cnt = ntrec * TP_BSIZE; 847 rd = 0; 848 getmore: 849 #ifdef RRESTORE 850 if (host) 851 i = rmtread(&tapebuf[rd], cnt); 852 else 853 #endif 854 i = read(mt, &tapebuf[rd], cnt); 855 /* 856 * Check for mid-tape short read error. 857 * If found, skip rest of buffer and start with the next. 858 */ 859 if (!pipein && numtrec < ntrec && i > 0) { 860 dprintf(stdout, "mid-media short read error.\n"); 861 numtrec = ntrec; 862 } 863 /* 864 * Handle partial block read. 865 */ 866 if (pipein && i == 0 && rd > 0) 867 i = rd; 868 else if (i > 0 && i != ntrec * TP_BSIZE) { 869 if (pipein) { 870 rd += i; 871 cnt -= i; 872 if (cnt > 0) 873 goto getmore; 874 i = rd; 875 } else { 876 /* 877 * Short read. Process the blocks read. 878 */ 879 if (i % TP_BSIZE != 0) 880 vprintf(stdout, 881 "partial block read: %ld should be %ld\n", 882 i, ntrec * TP_BSIZE); 883 numtrec = i / TP_BSIZE; 884 } 885 } 886 /* 887 * Handle read error. 888 */ 889 if (i < 0) { 890 fprintf(stderr, "Tape read error while "); 891 switch (curfile.action) { 892 default: 893 fprintf(stderr, "trying to set up tape\n"); 894 break; 895 case UNKNOWN: 896 fprintf(stderr, "trying to resynchronize\n"); 897 break; 898 case USING: 899 fprintf(stderr, "restoring %s\n", curfile.name); 900 break; 901 case SKIP: 902 fprintf(stderr, "skipping over inode %ju\n", 903 (uintmax_t)curfile.ino); 904 break; 905 } 906 if (!yflag && !reply("continue")) 907 done(1); 908 i = ntrec * TP_BSIZE; 909 memset(tapebuf, 0, i); 910 #ifdef RRESTORE 911 if (host) 912 seek_failed = (rmtseek(i, 1) < 0); 913 else 914 #endif 915 seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1); 916 917 if (seek_failed) { 918 fprintf(stderr, 919 "continuation failed: %s\n", strerror(errno)); 920 done(1); 921 } 922 } 923 /* 924 * Handle end of tape. 925 */ 926 if (i == 0) { 927 vprintf(stdout, "End-of-tape encountered\n"); 928 if (!pipein) { 929 newvol = volno + 1; 930 volno = 0; 931 numtrec = 0; 932 getvol(newvol); 933 readtape(buf); 934 return; 935 } 936 if (rd % TP_BSIZE != 0) 937 panic("partial block read: %ld should be %ld\n", 938 rd, ntrec * TP_BSIZE); 939 terminateinput(); 940 memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE); 941 } 942 blkcnt = 0; 943 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE); 944 blksread++; 945 tapeaddr++; 946 } 947 948 static void 949 findtapeblksize(void) 950 { 951 long i; 952 953 for (i = 0; i < ntrec; i++) 954 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0; 955 blkcnt = 0; 956 #ifdef RRESTORE 957 if (host) 958 i = rmtread(tapebuf, ntrec * TP_BSIZE); 959 else 960 #endif 961 i = read(mt, tapebuf, ntrec * TP_BSIZE); 962 963 if (i <= 0) { 964 fprintf(stderr, "tape read error: %s\n", strerror(errno)); 965 done(1); 966 } 967 if (i % TP_BSIZE != 0) { 968 fprintf(stderr, "Tape block size (%ld) %s (%d)\n", 969 i, "is not a multiple of dump block size", TP_BSIZE); 970 done(1); 971 } 972 ntrec = i / TP_BSIZE; 973 numtrec = ntrec; 974 vprintf(stdout, "Tape block size is %ld\n", ntrec); 975 } 976 977 void 978 closemt(void) 979 { 980 981 if (mt < 0) 982 return; 983 #ifdef RRESTORE 984 if (host) 985 rmtclose(); 986 else 987 #endif 988 close(mt); 989 } 990 991 /* 992 * Read the next block from the tape. 993 * Check to see if it is one of several vintage headers. 994 * If it is an old style header, convert it to a new style header. 995 * If it is not any valid header, return an error. 996 */ 997 static int 998 gethead(struct s_spcl *buf) 999 { 1000 long i; 1001 union { 1002 quad_t qval; 1003 int32_t val[2]; 1004 } qcvt; 1005 union u_ospcl { 1006 char dummy[TP_BSIZE]; 1007 struct s_ospcl { 1008 int32_t c_type; 1009 int32_t c_date; 1010 int32_t c_ddate; 1011 int32_t c_volume; 1012 int32_t c_tapea; 1013 u_short c_inumber; 1014 int32_t c_magic; 1015 int32_t c_checksum; 1016 struct odinode { 1017 unsigned short odi_mode; 1018 u_short odi_nlink; 1019 u_short odi_uid; 1020 u_short odi_gid; 1021 int32_t odi_size; 1022 int32_t odi_rdev; 1023 char odi_addr[36]; 1024 int32_t odi_atime; 1025 int32_t odi_mtime; 1026 int32_t odi_ctime; 1027 } c_dinode; 1028 int32_t c_count; 1029 char c_addr[256]; 1030 } s_ospcl; 1031 } u_ospcl; 1032 1033 if (!cvtflag) { 1034 readtape((char *)buf); 1035 if (buf->c_magic != NFS_MAGIC) { 1036 if (swabl(buf->c_magic) != NFS_MAGIC) 1037 return (FAIL); 1038 if (!Bcvt) { 1039 vprintf(stdout, "Note: Doing Byte swapping\n"); 1040 Bcvt = 1; 1041 } 1042 } 1043 if (checksum((int *)buf) == FAIL) 1044 return (FAIL); 1045 if (Bcvt) { 1046 swabst("8l4s31l", (u_char *)buf); 1047 swabst("l",(u_char *) &buf->c_level); 1048 swabst("2l",(u_char *) &buf->c_flags); 1049 } 1050 goto good; 1051 } 1052 readtape((char *)(&u_ospcl.s_ospcl)); 1053 memset(buf, 0, (long)TP_BSIZE); 1054 buf->c_type = u_ospcl.s_ospcl.c_type; 1055 buf->c_date = u_ospcl.s_ospcl.c_date; 1056 buf->c_ddate = u_ospcl.s_ospcl.c_ddate; 1057 buf->c_volume = u_ospcl.s_ospcl.c_volume; 1058 buf->c_tapea = u_ospcl.s_ospcl.c_tapea; 1059 buf->c_inumber = u_ospcl.s_ospcl.c_inumber; 1060 buf->c_checksum = u_ospcl.s_ospcl.c_checksum; 1061 buf->c_magic = u_ospcl.s_ospcl.c_magic; 1062 buf->c_dinode.di_mode = u_ospcl.s_ospcl.c_dinode.odi_mode; 1063 buf->c_dinode.di_nlink = u_ospcl.s_ospcl.c_dinode.odi_nlink; 1064 buf->c_dinode.di_uid = u_ospcl.s_ospcl.c_dinode.odi_uid; 1065 buf->c_dinode.di_gid = u_ospcl.s_ospcl.c_dinode.odi_gid; 1066 buf->c_dinode.di_size = u_ospcl.s_ospcl.c_dinode.odi_size; 1067 buf->c_dinode.di_rdev = u_ospcl.s_ospcl.c_dinode.odi_rdev; 1068 buf->c_dinode.di_atime = u_ospcl.s_ospcl.c_dinode.odi_atime; 1069 buf->c_dinode.di_mtime = u_ospcl.s_ospcl.c_dinode.odi_mtime; 1070 buf->c_dinode.di_ctime = u_ospcl.s_ospcl.c_dinode.odi_ctime; 1071 buf->c_count = u_ospcl.s_ospcl.c_count; 1072 memmove(buf->c_addr, u_ospcl.s_ospcl.c_addr, (long)256); 1073 if (u_ospcl.s_ospcl.c_magic != OFS_MAGIC || 1074 checksum((int *)(&u_ospcl.s_ospcl)) == FAIL) 1075 return(FAIL); 1076 buf->c_magic = NFS_MAGIC; 1077 1078 good: 1079 if ((buf->c_dinode.di_size == 0 || buf->c_dinode.di_size > 0xfffffff) && 1080 (buf->c_dinode.di_mode & IFMT) == IFDIR && Qcvt == 0) { 1081 qcvt.qval = buf->c_dinode.di_size; 1082 if (qcvt.val[0] || qcvt.val[1]) { 1083 printf("Note: Doing Quad swapping\n"); 1084 Qcvt = 1; 1085 } 1086 } 1087 if (Qcvt) { 1088 qcvt.qval = buf->c_dinode.di_size; 1089 i = qcvt.val[1]; 1090 qcvt.val[1] = qcvt.val[0]; 1091 qcvt.val[0] = i; 1092 buf->c_dinode.di_size = qcvt.qval; 1093 } 1094 readmapflag = 0; 1095 1096 switch (buf->c_type) { 1097 1098 case TS_CLRI: 1099 case TS_BITS: 1100 /* 1101 * Have to patch up missing information in bit map headers 1102 */ 1103 buf->c_inumber = 0; 1104 buf->c_dinode.di_size = buf->c_count * TP_BSIZE; 1105 if (buf->c_count > TP_NINDIR) 1106 readmapflag = 1; 1107 else 1108 for (i = 0; i < buf->c_count; i++) 1109 buf->c_addr[i]++; 1110 break; 1111 1112 case TS_TAPE: 1113 if ((buf->c_flags & DR_NEWINODEFMT) == 0) 1114 oldinofmt = 1; 1115 /* fall through */ 1116 case TS_END: 1117 buf->c_inumber = 0; 1118 break; 1119 1120 case TS_INODE: 1121 case TS_ADDR: 1122 break; 1123 1124 default: 1125 panic("gethead: unknown inode type %d\n", buf->c_type); 1126 break; 1127 } 1128 /* 1129 * If we are restoring a filesystem with old format inodes, 1130 * copy the uid/gid to the new location. 1131 */ 1132 if (oldinofmt) { 1133 buf->c_dinode.di_uid = buf->c_dinode.di_ouid; 1134 buf->c_dinode.di_gid = buf->c_dinode.di_ogid; 1135 } 1136 tapeaddr = buf->c_tapea; 1137 if (dflag) 1138 accthdr(buf); 1139 return(GOOD); 1140 } 1141 1142 /* 1143 * Check that a header is where it belongs and predict the next header 1144 */ 1145 static void 1146 accthdr(struct s_spcl *header) 1147 { 1148 static ufs1_ino_t previno = 0x7fffffff; 1149 static int prevtype; 1150 static long predict; 1151 long blks, i; 1152 1153 if (header->c_type == TS_TAPE) { 1154 fprintf(stderr, "Volume header (%s inode format) ", 1155 oldinofmt ? "old" : "new"); 1156 if (header->c_firstrec) 1157 fprintf(stderr, "begins with record %ld", 1158 (long)header->c_firstrec); 1159 fprintf(stderr, "\n"); 1160 previno = 0x7fffffff; 1161 return; 1162 } 1163 if (previno == 0x7fffffff) 1164 goto newcalc; 1165 switch (prevtype) { 1166 case TS_BITS: 1167 fprintf(stderr, "Dumped inodes map header"); 1168 break; 1169 case TS_CLRI: 1170 fprintf(stderr, "Used inodes map header"); 1171 break; 1172 case TS_INODE: 1173 fprintf(stderr, "File header, ino %d", previno); 1174 break; 1175 case TS_ADDR: 1176 fprintf(stderr, "File continuation header, ino %d", previno); 1177 break; 1178 case TS_END: 1179 fprintf(stderr, "End of tape header"); 1180 break; 1181 } 1182 if (predict != blksread - 1) 1183 fprintf(stderr, "; predicted %ld blocks, got %ld blocks", 1184 predict, blksread - 1); 1185 fprintf(stderr, "\n"); 1186 newcalc: 1187 blks = 0; 1188 if (header->c_type != TS_END) 1189 for (i = 0; i < header->c_count; i++) 1190 if (readmapflag || header->c_addr[i] != 0) 1191 blks++; 1192 predict = blks; 1193 blksread = 0; 1194 prevtype = header->c_type; 1195 previno = header->c_inumber; 1196 } 1197 1198 /* 1199 * Find an inode header. 1200 * Complain if had to skip. 1201 */ 1202 static void 1203 findinode(struct s_spcl *header) 1204 { 1205 static long skipcnt = 0; 1206 long i; 1207 char buf[TP_BSIZE]; 1208 int htype; 1209 1210 curfile.name = "<name unknown>"; 1211 curfile.action = UNKNOWN; 1212 curfile.dip = NULL; 1213 curfile.ino = 0; 1214 do { 1215 if (header->c_magic != NFS_MAGIC) { 1216 skipcnt++; 1217 while (gethead(header) == FAIL || 1218 header->c_date != dumpdate) 1219 skipcnt++; 1220 } 1221 htype = header->c_type; 1222 switch (htype) { 1223 1224 case TS_ADDR: 1225 /* 1226 * Skip up to the beginning of the next record 1227 */ 1228 for (i = 0; i < header->c_count; i++) 1229 if (header->c_addr[i]) 1230 readtape(buf); 1231 while (gethead(header) == FAIL || 1232 header->c_date != dumpdate) 1233 skipcnt++; 1234 break; 1235 1236 case TS_INODE: 1237 curfile.dip = &header->c_dinode; 1238 curfile.ino = header->c_inumber; 1239 break; 1240 1241 case TS_END: 1242 /* If we missed some tapes, get another volume. */ 1243 if (tapesread & (tapesread + 1)) { 1244 getvol(0); 1245 continue; 1246 } 1247 curfile.ino = maxino; 1248 break; 1249 1250 case TS_CLRI: 1251 curfile.name = "<file removal list>"; 1252 break; 1253 1254 case TS_BITS: 1255 curfile.name = "<file dump list>"; 1256 break; 1257 1258 case TS_TAPE: 1259 panic("unexpected tape header\n"); 1260 /* NOTREACHED */ 1261 exit(1); /* hint for a compiler */ 1262 1263 default: 1264 panic("unknown tape header type %d\n", spcl.c_type); 1265 /* NOTREACHED */ 1266 exit(1); /* hint for a compiler */ 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(int *buf) 1278 { 1279 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 vfprintf(stderr, fmt, ap); 1312 va_end(ap); 1313 } 1314 #endif /* RRESTORE */ 1315 1316 static u_char * 1317 swabshort(u_char *sp, 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(u_char *sp, 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(const char *cp, 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("l", (u_char *)&x); 1380 return (x); 1381 } 1382