sbin/restore/tape.c

   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  * 4. 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
  35 #ifndef lint
  36 #if 0
  37 static char sccsid[] = "@(#)tape.c      8.9 (Berkeley) 5/1/95";
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  43
  44 #include <sys/param.h>
  45 #include <sys/file.h>
  46 #include <sys/mtio.h>
  47 #include <sys/stat.h>
  48 #include <sys/time.h>
  49 #include <sys/extattr.h>
  50 #include <sys/acl.h>
  51
  52 #include <ufs/ufs/extattr.h>
  53 #include <ufs/ufs/dinode.h>
  54 #include <protocols/dumprestore.h>
  55
  56 #include <errno.h>
  57 #include <limits.h>
  58 #include <paths.h>
  59 #include <setjmp.h>
  60 #include <stdint.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <time.h>
  65 #include <timeconv.h>
  66 #include <unistd.h>
  67
  68 #include "restore.h"
  69 #include "extern.h"
  70
  71 static long     fssize = MAXBSIZE;
  72 static int      mt = -1;
  73 static int      pipein = 0;
  74 static int      pipecmdin = 0;
  75 static FILE     *popenfp = NULL;
  76 static char     *magtape;
  77 static int      blkcnt;
  78 static int      numtrec;
  79 static char     *tapebuf;
  80 static union    u_spcl endoftapemark;
  81 static long     byteslide = 0;
  82 static long     blksread;               /* blocks read since last header */
  83 static int64_t  tapeaddr = 0;           /* current TP_BSIZE tape record */
  84 static long     tapesread;
  85 static jmp_buf  restart;
  86 static int      gettingfile = 0;        /* restart has a valid frame */
  87 static char     *host = NULL;
  88 static int      readmapflag;
  89
  90 static int      ofile;
  91 static char     *map;
  92 static char     lnkbuf[MAXPATHLEN + 1];
  93 static int      pathlen;
  94
  95 int             Bcvt;           /* Swap Bytes */
  96 int             oldinofmt;      /* FreeBSD 1 inode format needs cvt */
  97
  98 #define FLUSHTAPEBUF()  blkcnt = ntrec + 1
  99
 100 char *namespace_names[] = EXTATTR_NAMESPACE_NAMES;
 101
 102 static void      accthdr(struct s_spcl *);
 103 static int       checksum(int *);
 104 static void      findinode(struct s_spcl *);
 105 static void      findtapeblksize(void);
 106 static char     *setupextattr(int);
 107 static void      xtrattr(char *, size_t);
 108 static void      set_extattr_link(char *, void *, int);
 109 static void      set_extattr_fd(int, char *, void *, int);
 110 static void      skiphole(void (*)(char *, size_t), size_t *);
 111 static int       gethead(struct s_spcl *);
 112 static void      readtape(char *);
 113 static void      setdumpnum(void);
 114 static u_long    swabl(u_long);
 115 static u_char   *swablong(u_char *, int);
 116 static u_char   *swabshort(u_char *, int);
 117 static void      terminateinput(void);
 118 static void      xtrfile(char *, size_t);
 119 static void      xtrlnkfile(char *, size_t);
 120 static void      xtrlnkskip(char *, size_t);
 121 static void      xtrmap(char *, size_t);
 122 static void      xtrmapskip(char *, size_t);
 123 static void      xtrskip(char *, size_t);
 124
 125 /*
 126  * Set up an input source
 127  */
 128 void
 129 setinput(char *source, int ispipecommand)
 130 {
 131         FLUSHTAPEBUF();
 132         if (bflag)
 133                 newtapebuf(ntrec);
 134         else
 135                 newtapebuf(MAX(NTREC, HIGHDENSITYTREC));
 136         terminal = stdin;
 137
 138         if (ispipecommand)
 139                 pipecmdin++;
 140         else
 141 #ifdef RRESTORE
 142         if (strchr(source, ':')) {
 143                 host = source;
 144                 source = strchr(host, ':');
 145                 *source++ = '\0';
 146                 if (rmthost(host) == 0)
 147                         done(1);
 148         } else
 149 #endif
 150         if (strcmp(source, "-") == 0) {
 151                 /*
 152                  * Since input is coming from a pipe we must establish
 153                  * our own connection to the terminal.
 154                  */
 155                 terminal = fopen(_PATH_TTY, "r");
 156                 if (terminal == NULL) {
 157                         (void)fprintf(stderr, "cannot open %s: %s\n",
 158                             _PATH_TTY, strerror(errno));
 159                         terminal = fopen(_PATH_DEVNULL, "r");
 160                         if (terminal == NULL) {
 161                                 (void)fprintf(stderr, "cannot open %s: %s\n",
 162                                     _PATH_DEVNULL, strerror(errno));
 163                                 done(1);
 164                         }
 165                 }
 166                 pipein++;
 167         }
 168         /* no longer need or want root privileges */
 169         if (setuid(getuid()) != 0) {
 170                 fprintf(stderr, "setuid failed\n");
 171                 done(1);
 172         }
 173         magtape = strdup(source);
 174         if (magtape == NULL) {
 175                 fprintf(stderr, "Cannot allocate space for magtape buffer\n");
 176                 done(1);
 177         }
 178 }
 179
 180 void
 181 newtapebuf(long size)
 182 {
 183         static int tapebufsize = -1;
 184
 185         ntrec = size;
 186         if (size <= tapebufsize)
 187                 return;
 188         if (tapebuf != NULL)
 189                 free(tapebuf - TP_BSIZE);
 190         tapebuf = malloc((size+1) * TP_BSIZE);
 191         if (tapebuf == NULL) {
 192                 fprintf(stderr, "Cannot allocate space for tape buffer\n");
 193                 done(1);
 194         }
 195         tapebuf += TP_BSIZE;
 196         tapebufsize = size;
 197 }
 198
 199 /*
 200  * Verify that the tape drive can be accessed and
 201  * that it actually is a dump tape.
 202  */
 203 void
 204 setup(void)
 205 {
 206         int i, j, *ip;
 207         struct stat stbuf;
 208
 209         vprintf(stdout, "Verify tape and initialize maps\n");
 210         if (pipecmdin) {
 211                 if (setenv("RESTORE_VOLUME", "1", 1) == -1) {
 212                         fprintf(stderr, "Cannot set $RESTORE_VOLUME: %s\n",
 213                             strerror(errno));
 214                         done(1);
 215                 }
 216                 popenfp = popen(magtape, "r");
 217                 mt = popenfp ? fileno(popenfp) : -1;
 218         } else
 219 #ifdef RRESTORE
 220         if (host)
 221                 mt = rmtopen(magtape, 0);
 222         else
 223 #endif
 224         if (pipein)
 225                 mt = 0;
 226         else
 227                 mt = open(magtape, O_RDONLY, 0);
 228         if (mt < 0) {
 229                 fprintf(stderr, "%s: %s\n", magtape, strerror(errno));
 230                 done(1);
 231         }
 232         volno = 1;
 233         setdumpnum();
 234         FLUSHTAPEBUF();
 235         if (!pipein && !pipecmdin && !bflag)
 236                 findtapeblksize();
 237         if (gethead(&spcl) == FAIL) {
 238                 fprintf(stderr, "Tape is not a dump tape\n");
 239                 done(1);
 240         }
 241         if (pipein) {
 242                 endoftapemark.s_spcl.c_magic = FS_UFS2_MAGIC;
 243                 endoftapemark.s_spcl.c_type = TS_END;
 244                 ip = (int *)&endoftapemark;
 245                 j = sizeof(union u_spcl) / sizeof(int);
 246                 i = 0;
 247                 do
 248                         i += *ip++;
 249                 while (--j);
 250                 endoftapemark.s_spcl.c_checksum = CHECKSUM - i;
 251         }
 252         if (vflag || command == 't')
 253                 printdumpinfo();
 254         dumptime = _time64_to_time(spcl.c_ddate);
 255         dumpdate = _time64_to_time(spcl.c_date);
 256         if (stat(".", &stbuf) < 0) {
 257                 fprintf(stderr, "cannot stat .: %s\n", strerror(errno));
 258                 done(1);
 259         }
 260         if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE )
 261                 fssize = TP_BSIZE;
 262         if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE)
 263                 fssize = stbuf.st_blksize;
 264         if (((TP_BSIZE - 1) & stbuf.st_blksize) != 0) {
 265                 fprintf(stderr, "Warning: filesystem with non-multiple-of-%d "
 266                     "blocksize (%d);\n", TP_BSIZE, stbuf.st_blksize);
 267                 fssize = roundup(fssize, TP_BSIZE);
 268                 fprintf(stderr, "\twriting using blocksize %ld\n", fssize);
 269         }
 270         if (spcl.c_volume != 1) {
 271                 fprintf(stderr, "Tape is not volume 1 of the dump\n");
 272                 done(1);
 273         }
 274         if (gethead(&spcl) == FAIL) {
 275                 dprintf(stdout, "header read failed at %ld blocks\n", blksread);
 276                 panic("no header after volume mark!\n");
 277         }
 278         findinode(&spcl);
 279         if (spcl.c_type != TS_CLRI) {
 280                 fprintf(stderr, "Cannot find file removal list\n");
 281                 done(1);
 282         }
 283         maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
 284         dprintf(stdout, "maxino = %ju\n", (uintmax_t)maxino);
 285         map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
 286         if (map == NULL)
 287                 panic("no memory for active inode map\n");
 288         usedinomap = map;
 289         curfile.action = USING;
 290         getfile(xtrmap, xtrmapskip, xtrmapskip);
 291         if (spcl.c_type != TS_BITS) {
 292                 fprintf(stderr, "Cannot find file dump list\n");
 293                 done(1);
 294         }
 295         map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
 296         if (map == (char *)NULL)
 297                 panic("no memory for file dump list\n");
 298         dumpmap = map;
 299         curfile.action = USING;
 300         getfile(xtrmap, xtrmapskip, xtrmapskip);
 301         /*
 302          * If there may be whiteout entries on the tape, pretend that the
 303          * whiteout inode exists, so that the whiteout entries can be
 304          * extracted.
 305          */
 306         SETINO(WINO, dumpmap);
 307         /* 'r' restores don't call getvol() for tape 1, so mark it as read. */
 308         if (command == 'r')
 309                 tapesread = 1;
 310 }
 311
 312 /*
 313  * Prompt user to load a new dump volume.
 314  * "Nextvol" is the next suggested volume to use.
 315  * This suggested volume is enforced when doing full
 316  * or incremental restores, but can be overridden by
 317  * the user when only extracting a subset of the files.
 318  */
 319 void
 320 getvol(long nextvol)
 321 {
 322         int64_t prevtapea;
 323         long i, newvol, savecnt;
 324         union u_spcl tmpspcl;
 325 #       define tmpbuf tmpspcl.s_spcl
 326         char buf[TP_BSIZE];
 327
 328         if (nextvol == 1) {
 329                 tapesread = 0;
 330                 gettingfile = 0;
 331         }
 332         prevtapea = tapeaddr;
 333         savecnt = blksread;
 334         if (pipein) {
 335                 if (nextvol != 1) {
 336                         panic("Changing volumes on pipe input?\n");
 337                         /* Avoid looping if we couldn't ask the user. */
 338                         if (yflag || ferror(terminal) || feof(terminal))
 339                                 done(1);
 340                 }
 341                 if (volno == 1)
 342                         return;
 343                 newvol = 0;
 344                 goto gethdr;
 345         }
 346 again:
 347         if (pipein)
 348                 done(1); /* pipes do not get a second chance */
 349         if (command == 'R' || command == 'r' || curfile.action != SKIP)
 350                 newvol = nextvol;
 351         else
 352                 newvol = 0;
 353         while (newvol <= 0) {
 354                 if (tapesread == 0) {
 355                         fprintf(stderr, "%s%s%s%s%s%s%s",
 356                             "You have not read any tapes yet.\n",
 357                             "If you are extracting just a few files,",
 358                             " start with the last volume\n",
 359                             "and work towards the first; restore",
 360                             " can quickly skip tapes that\n",
 361                             "have no further files to extract.",
 362                             " Otherwise, begin with volume 1.\n");
 363                 } else {
 364                         fprintf(stderr, "You have read volumes");
 365                         strcpy(buf, ": ");
 366                         for (i = 0; i < 32; i++)
 367                                 if (tapesread & (1 << i)) {
 368                                         fprintf(stderr, "%s%ld", buf, i + 1);
 369                                         strcpy(buf, ", ");
 370                                 }
 371                         fprintf(stderr, "\n");
 372                 }
 373                 do      {
 374                         fprintf(stderr, "Specify next volume #: ");
 375                         (void) fflush(stderr);
 376                         if (fgets(buf, BUFSIZ, terminal) == NULL)
 377                                 done(1);
 378                 } while (buf[0] == '\n');
 379                 newvol = atoi(buf);
 380                 if (newvol <= 0) {
 381                         fprintf(stderr,
 382                             "Volume numbers are positive numerics\n");
 383                 }
 384         }
 385         if (newvol == volno) {
 386                 tapesread |= 1 << (volno - 1);
 387                 return;
 388         }
 389         closemt();
 390         fprintf(stderr, "Mount tape volume %ld\n", newvol);
 391         fprintf(stderr, "Enter ``none'' if there are no more tapes\n");
 392         fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape);
 393         (void) fflush(stderr);
 394         if (fgets(buf, BUFSIZ, terminal) == NULL)
 395                 done(1);
 396         if (!strcmp(buf, "none\n")) {
 397                 terminateinput();
 398                 return;
 399         }
 400         if (buf[0] != '\n') {
 401                 (void) strcpy(magtape, buf);
 402                 magtape[strlen(magtape) - 1] = '\0';
 403         }
 404         if (pipecmdin) {
 405                 char volno[sizeof("2147483647")];
 406
 407                 (void)sprintf(volno, "%ld", newvol);
 408                 if (setenv("RESTORE_VOLUME", volno, 1) == -1) {
 409                         fprintf(stderr, "Cannot set $RESTORE_VOLUME: %s\n",
 410                             strerror(errno));
 411                         done(1);
 412                 }
 413                 popenfp = popen(magtape, "r");
 414                 mt = popenfp ? fileno(popenfp) : -1;
 415         } else
 416 #ifdef RRESTORE
 417         if (host)
 418                 mt = rmtopen(magtape, 0);
 419         else
 420 #endif
 421                 mt = open(magtape, O_RDONLY, 0);
 422
 423         if (mt == -1) {
 424                 fprintf(stderr, "Cannot open %s\n", magtape);
 425                 volno = -1;
 426                 goto again;
 427         }
 428 gethdr:
 429         volno = newvol;
 430         setdumpnum();
 431         FLUSHTAPEBUF();
 432         if (gethead(&tmpbuf) == FAIL) {
 433                 dprintf(stdout, "header read failed at %ld blocks\n", blksread);
 434                 fprintf(stderr, "tape is not dump tape\n");
 435                 volno = 0;
 436                 goto again;
 437         }
 438         if (tmpbuf.c_volume != volno) {
 439                 fprintf(stderr, "Wrong volume (%jd)\n",
 440                     (intmax_t)tmpbuf.c_volume);
 441                 volno = 0;
 442                 goto again;
 443         }
 444         if (_time64_to_time(tmpbuf.c_date) != dumpdate ||
 445             _time64_to_time(tmpbuf.c_ddate) != dumptime) {
 446                 time_t t = _time64_to_time(tmpbuf.c_date);
 447                 fprintf(stderr, "Wrong dump date\n\tgot: %s", ctime(&t));
 448                 fprintf(stderr, "\twanted: %s", ctime(&dumpdate));
 449                 volno = 0;
 450                 goto again;
 451         }
 452         tapesread |= 1 << (volno - 1);
 453         blksread = savecnt;
 454         /*
 455          * If continuing from the previous volume, skip over any
 456          * blocks read already at the end of the previous volume.
 457          *
 458          * If coming to this volume at random, skip to the beginning
 459          * of the next record.
 460          */
 461         dprintf(stdout, "last rec %jd, tape starts with %jd\n",
 462             (intmax_t)prevtapea, (intmax_t)tmpbuf.c_tapea);
 463         if (tmpbuf.c_type == TS_TAPE) {
 464                 if (curfile.action != USING) {
 465                         /*
 466                          * XXX Dump incorrectly sets c_count to 1 in the
 467                          * volume header of the first tape, so ignore
 468                          * c_count when volno == 1.
 469                          */
 470                         if (volno != 1)
 471                                 for (i = tmpbuf.c_count; i > 0; i--)
 472                                         readtape(buf);
 473                 } else if (tmpbuf.c_tapea <= prevtapea) {
 474                         /*
 475                          * Normally the value of c_tapea in the volume
 476                          * header is the record number of the header itself.
 477                          * However in the volume header following an EOT-
 478                          * terminated tape, it is the record number of the
 479                          * first continuation data block (dump bug?).
 480                          *
 481                          * The next record we want is `prevtapea + 1'.
 482                          */
 483                         i = prevtapea + 1 - tmpbuf.c_tapea;
 484                         dprintf(stderr, "Skipping %ld duplicate record%s.\n",
 485                                 i, i > 1 ? "s" : "");
 486                         while (--i >= 0)
 487                                 readtape(buf);
 488                 }
 489         }
 490         if (curfile.action == USING) {
 491                 if (volno == 1)
 492                         panic("active file into volume 1\n");
 493                 return;
 494         }
 495         (void) gethead(&spcl);
 496         findinode(&spcl);
 497         if (gettingfile) {
 498                 gettingfile = 0;
 499                 longjmp(restart, 1);
 500         }
 501 }
 502
 503 /*
 504  * Handle unexpected EOF.
 505  */
 506 static void
 507 terminateinput(void)
 508 {
 509
 510         if (gettingfile && curfile.action == USING) {
 511                 printf("Warning: %s %s\n",
 512                     "End-of-input encountered while extracting", curfile.name);
 513         }
 514         curfile.name = "<name unknown>";
 515         curfile.action = UNKNOWN;
 516         curfile.mode = 0;
 517         curfile.ino = maxino;
 518         if (gettingfile) {
 519                 gettingfile = 0;
 520                 longjmp(restart, 1);
 521         }
 522 }
 523
 524 /*
 525  * handle multiple dumps per tape by skipping forward to the
 526  * appropriate one.
 527  */
 528 static void
 529 setdumpnum(void)
 530 {
 531         struct mtop tcom;
 532
 533         if (dumpnum == 1 || volno != 1)
 534                 return;
 535         if (pipein) {
 536                 fprintf(stderr, "Cannot have multiple dumps on pipe input\n");
 537                 done(1);
 538         }
 539         tcom.mt_op = MTFSF;
 540         tcom.mt_count = dumpnum - 1;
 541 #ifdef RRESTORE
 542         if (host)
 543                 rmtioctl(MTFSF, dumpnum - 1);
 544         else
 545 #endif
 546                 if (!pipecmdin && ioctl(mt, MTIOCTOP, (char *)&tcom) < 0)
 547                         fprintf(stderr, "ioctl MTFSF: %s\n", strerror(errno));
 548 }
 549
 550 void
 551 printdumpinfo(void)
 552 {
 553         time_t t;
 554         t = _time64_to_time(spcl.c_date);
 555         fprintf(stdout, "Dump   date: %s", ctime(&t));
 556         t = _time64_to_time(spcl.c_ddate);
 557         fprintf(stdout, "Dumped from: %s",
 558             (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&t));
 559         if (spcl.c_host[0] == '\0')
 560                 return;
 561         fprintf(stderr, "Level %jd dump of %s on %s:%s\n",
 562             (intmax_t)spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev);
 563         fprintf(stderr, "Label: %s\n", spcl.c_label);
 564 }
 565
 566 int
 567 extractfile(char *name)
 568 {
 569         u_int flags;
 570         uid_t uid;
 571         gid_t gid;
 572         mode_t mode;
 573         int extsize;
 574         struct timespec mtimep[2], ctimep[2];
 575         struct entry *ep;
 576         char *buf;
 577
 578         curfile.name = name;
 579         curfile.action = USING;
 580         mtimep[0].tv_sec = curfile.atime_sec;
 581         mtimep[0].tv_nsec = curfile.atime_nsec;
 582         mtimep[1].tv_sec = curfile.mtime_sec;
 583         mtimep[1].tv_nsec = curfile.mtime_nsec;
 584         ctimep[0].tv_sec = curfile.atime_sec;
 585         ctimep[0].tv_nsec = curfile.atime_nsec;
 586         ctimep[1].tv_sec = curfile.birthtime_sec;
 587         ctimep[1].tv_nsec = curfile.birthtime_nsec;
 588         extsize = curfile.extsize;
 589         uid = getuid();
 590         if (uid == 0)
 591                 uid = curfile.uid;
 592         gid = curfile.gid;
 593         mode = curfile.mode;
 594         flags = curfile.file_flags;
 595         switch (mode & IFMT) {
 596
 597         default:
 598                 fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode);
 599                 skipfile();
 600                 return (FAIL);
 601
 602         case IFSOCK:
 603                 vprintf(stdout, "skipped socket %s\n", name);
 604                 skipfile();
 605                 return (GOOD);
 606
 607         case IFDIR:
 608                 if (mflag) {
 609                         ep = lookupname(name);
 610                         if (ep == NULL || ep->e_flags & EXTRACT)
 611                                 panic("unextracted directory %s\n", name);
 612                         skipfile();
 613                         return (GOOD);
 614                 }
 615                 vprintf(stdout, "extract file %s\n", name);
 616                 return (genliteraldir(name, curfile.ino));
 617
 618         case IFLNK:
 619                 lnkbuf[0] = '\0';
 620                 pathlen = 0;
 621                 buf = setupextattr(extsize);
 622                 getfile(xtrlnkfile, xtrattr, xtrlnkskip);
 623                 if (pathlen == 0) {
 624                         vprintf(stdout,
 625                             "%s: zero length symbolic link (ignored)\n", name);
 626                         return (GOOD);
 627                 }
 628                 if (linkit(lnkbuf, name, SYMLINK) == GOOD) {
 629                         if (extsize > 0)
 630                                 set_extattr_link(name, buf, extsize);
 631                         (void) lchown(name, uid, gid);
 632                         (void) lchmod(name, mode);
 633                         (void) utimensat(AT_FDCWD, name, ctimep,
 634                             AT_SYMLINK_NOFOLLOW);
 635                         (void) utimensat(AT_FDCWD, name, mtimep,
 636                             AT_SYMLINK_NOFOLLOW);
 637                         (void) lchflags(name, flags);
 638                         return (GOOD);
 639                 }
 640                 return (FAIL);
 641
 642         case IFIFO:
 643                 vprintf(stdout, "extract fifo %s\n", name);
 644                 if (Nflag) {
 645                         skipfile();
 646                         return (GOOD);
 647                 }
 648                 if (uflag)
 649                         (void) unlink(name);
 650                 if (mkfifo(name, 0600) < 0) {
 651                         fprintf(stderr, "%s: cannot create fifo: %s\n",
 652                             name, strerror(errno));
 653                         skipfile();
 654                         return (FAIL);
 655                 }
 656                 if (extsize == 0) {
 657                         skipfile();
 658                 } else {
 659                         buf = setupextattr(extsize);
 660                         getfile(xtrnull, xtrattr, xtrnull);
 661                         set_extattr_file(name, buf, extsize);
 662                 }
 663                 (void) chown(name, uid, gid);
 664                 (void) chmod(name, mode);
 665                 (void) utimensat(AT_FDCWD, name, ctimep, 0);
 666                 (void) utimensat(AT_FDCWD, name, mtimep, 0);
 667                 (void) chflags(name, flags);
 668                 return (GOOD);
 669
 670         case IFCHR:
 671         case IFBLK:
 672                 vprintf(stdout, "extract special file %s\n", name);
 673                 if (Nflag) {
 674                         skipfile();
 675                         return (GOOD);
 676                 }
 677                 if (uflag)
 678                         (void) unlink(name);
 679                 if (mknod(name, (mode & (IFCHR | IFBLK)) | 0600,
 680                     (int)curfile.rdev) < 0) {
 681                         fprintf(stderr, "%s: cannot create special file: %s\n",
 682                             name, strerror(errno));
 683                         skipfile();
 684                         return (FAIL);
 685                 }
 686                 if (extsize == 0) {
 687                         skipfile();
 688                 } else {
 689                         buf = setupextattr(extsize);
 690                         getfile(xtrnull, xtrattr, xtrnull);
 691                         set_extattr_file(name, buf, extsize);
 692                 }
 693                 (void) chown(name, uid, gid);
 694                 (void) chmod(name, mode);
 695                 (void) utimensat(AT_FDCWD, name, ctimep, 0);
 696                 (void) utimensat(AT_FDCWD, name, mtimep, 0);
 697                 (void) chflags(name, flags);
 698                 return (GOOD);
 699
 700         case IFREG:
 701                 vprintf(stdout, "extract file %s\n", name);
 702                 if (Nflag) {
 703                         skipfile();
 704                         return (GOOD);
 705                 }
 706                 if (uflag)
 707                         (void) unlink(name);
 708                 if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC,
 709                     0600)) < 0) {
 710                         fprintf(stderr, "%s: cannot create file: %s\n",
 711                             name, strerror(errno));
 712                         skipfile();
 713                         return (FAIL);
 714                 }
 715                 buf = setupextattr(extsize);
 716                 getfile(xtrfile, xtrattr, xtrskip);
 717                 if (extsize > 0)
 718                         set_extattr_fd(ofile, name, buf, extsize);
 719                 (void) fchown(ofile, uid, gid);
 720                 (void) fchmod(ofile, mode);
 721                 (void) futimens(ofile, ctimep);
 722                 (void) futimens(ofile, mtimep);
 723                 (void) fchflags(ofile, flags);
 724                 (void) close(ofile);
 725                 return (GOOD);
 726         }
 727         /* NOTREACHED */
 728 }
 729
 730 /*
 731  * Set attributes for a file.
 732  */
 733 void
 734 set_extattr_file(char *name, void *buf, int size)
 735 {
 736         struct extattr *eap, *eaend;
 737
 738         vprintf(stdout, "Set attributes for %s:", name);
 739         eaend = buf + size;
 740         for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
 741                 /*
 742                  * Make sure this entry is complete.
 743                  */
 744                 if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
 745                         dprintf(stdout, "\n\t%scorrupted",
 746                                 eap == buf ? "" : "remainder ");
 747                         break;
 748                 }
 749                 if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
 750                         continue;
 751                 vprintf(stdout, "\n\t%s, (%d bytes), %*s",
 752                         namespace_names[eap->ea_namespace], eap->ea_length,
 753                         eap->ea_namelength, eap->ea_name);
 754                 /*
 755                  * First we try the general attribute setting interface.
 756                  * However, some attributes can only be set by root or
 757                  * by using special interfaces (for example, ACLs).
 758                  */
 759                 if (extattr_set_file(name, eap->ea_namespace, eap->ea_name,
 760                     EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
 761                         dprintf(stdout, " (set using extattr_set_file)");
 762                         continue;
 763                 }
 764                 /*
 765                  * If the general interface refuses to set the attribute,
 766                  * then we try all the specialized interfaces that we
 767                  * know about.
 768                  */
 769                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 770                     !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
 771                         if (acl_set_file(name, ACL_TYPE_ACCESS,
 772                             EXTATTR_CONTENT(eap)) != -1) {
 773                                 dprintf(stdout, " (set using acl_set_file)");
 774                                 continue;
 775                         }
 776                 }
 777                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 778                     !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
 779                         if (acl_set_file(name, ACL_TYPE_DEFAULT,
 780                             EXTATTR_CONTENT(eap)) != -1) {
 781                                 dprintf(stdout, " (set using acl_set_file)");
 782                                 continue;
 783                         }
 784                 }
 785                 vprintf(stdout, " (unable to set)");
 786         }
 787         vprintf(stdout, "\n");
 788 }
 789
 790 /*
 791  * Set attributes for a symbolic link.
 792  */
 793 static void
 794 set_extattr_link(char *name, void *buf, int size)
 795 {
 796         struct extattr *eap, *eaend;
 797
 798         vprintf(stdout, "Set attributes for %s:", name);
 799         eaend = buf + size;
 800         for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
 801                 /*
 802                  * Make sure this entry is complete.
 803                  */
 804                 if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
 805                         dprintf(stdout, "\n\t%scorrupted",
 806                                 eap == buf ? "" : "remainder ");
 807                         break;
 808                 }
 809                 if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
 810                         continue;
 811                 vprintf(stdout, "\n\t%s, (%d bytes), %*s",
 812                         namespace_names[eap->ea_namespace], eap->ea_length,
 813                         eap->ea_namelength, eap->ea_name);
 814                 /*
 815                  * First we try the general attribute setting interface.
 816                  * However, some attributes can only be set by root or
 817                  * by using special interfaces (for example, ACLs).
 818                  */
 819                 if (extattr_set_link(name, eap->ea_namespace, eap->ea_name,
 820                     EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
 821                         dprintf(stdout, " (set using extattr_set_link)");
 822                         continue;
 823                 }
 824                 /*
 825                  * If the general interface refuses to set the attribute,
 826                  * then we try all the specialized interfaces that we
 827                  * know about.
 828                  */
 829                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 830                     !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
 831                         if (acl_set_link_np(name, ACL_TYPE_ACCESS,
 832                             EXTATTR_CONTENT(eap)) != -1) {
 833                                 dprintf(stdout, " (set using acl_set_link_np)");
 834                                 continue;
 835                         }
 836                 }
 837                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 838                     !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
 839                         if (acl_set_link_np(name, ACL_TYPE_DEFAULT,
 840                             EXTATTR_CONTENT(eap)) != -1) {
 841                                 dprintf(stdout, " (set using acl_set_link_np)");
 842                                 continue;
 843                         }
 844                 }
 845                 vprintf(stdout, " (unable to set)");
 846         }
 847         vprintf(stdout, "\n");
 848 }
 849
 850 /*
 851  * Set attributes on a file descriptor.
 852  */
 853 static void
 854 set_extattr_fd(int fd, char *name, void *buf, int size)
 855 {
 856         struct extattr *eap, *eaend;
 857
 858         vprintf(stdout, "Set attributes for %s:", name);
 859         eaend = buf + size;
 860         for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
 861                 /*
 862                  * Make sure this entry is complete.
 863                  */
 864                 if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
 865                         dprintf(stdout, "\n\t%scorrupted",
 866                                 eap == buf ? "" : "remainder ");
 867                         break;
 868                 }
 869                 if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
 870                         continue;
 871                 vprintf(stdout, "\n\t%s, (%d bytes), %*s",
 872                         namespace_names[eap->ea_namespace], eap->ea_length,
 873                         eap->ea_namelength, eap->ea_name);
 874                 /*
 875                  * First we try the general attribute setting interface.
 876                  * However, some attributes can only be set by root or
 877                  * by using special interfaces (for example, ACLs).
 878                  */
 879                 if (extattr_set_fd(fd, eap->ea_namespace, eap->ea_name,
 880                     EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
 881                         dprintf(stdout, " (set using extattr_set_fd)");
 882                         continue;
 883                 }
 884                 /*
 885                  * If the general interface refuses to set the attribute,
 886                  * then we try all the specialized interfaces that we
 887                  * know about.
 888                  */
 889                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 890                     !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
 891                         if (acl_set_fd(fd, EXTATTR_CONTENT(eap)) != -1) {
 892                                 dprintf(stdout, " (set using acl_set_fd)");
 893                                 continue;
 894                         }
 895                 }
 896                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 897                     !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
 898                         if (acl_set_file(name, ACL_TYPE_DEFAULT,
 899                             EXTATTR_CONTENT(eap)) != -1) {
 900                                 dprintf(stdout, " (set using acl_set_file)");
 901                                 continue;
 902                         }
 903                 }
 904                 vprintf(stdout, " (unable to set)");
 905         }
 906         vprintf(stdout, "\n");
 907 }
 908
 909 /*
 910  * skip over bit maps on the tape
 911  */
 912 void
 913 skipmaps(void)
 914 {
 915
 916         while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI)
 917                 skipfile();
 918 }
 919
 920 /*
 921  * skip over a file on the tape
 922  */
 923 void
 924 skipfile(void)
 925 {
 926
 927         curfile.action = SKIP;
 928         getfile(xtrnull, xtrnull, xtrnull);
 929 }
 930
 931 /*
 932  * Skip a hole in an output file
 933  */
 934 static void
 935 skiphole(void (*skip)(char *, size_t), size_t *seekpos)
 936 {
 937         char buf[MAXBSIZE];
 938
 939         if (*seekpos > 0) {
 940                 (*skip)(buf, *seekpos);
 941                 *seekpos = 0;
 942         }
 943 }
 944
 945 /*
 946  * Extract a file from the tape.
 947  * When an allocated block is found it is passed to the fill function;
 948  * when an unallocated block (hole) is found, a zeroed buffer is passed
 949  * to the skip function.
 950  */
 951 void
 952 getfile(void (*datafill)(char *, size_t), void (*attrfill)(char *, size_t),
 953         void (*skip)(char *, size_t))
 954 {
 955         int i;
 956         volatile off_t size;
 957         size_t seekpos;
 958         int curblk, attrsize;
 959         void (*fillit)(char *, size_t);
 960         char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
 961         char junk[TP_BSIZE];
 962
 963         curblk = 0;
 964         size = spcl.c_size;
 965         seekpos = 0;
 966         attrsize = spcl.c_extsize;
 967         if (spcl.c_type == TS_END)
 968                 panic("ran off end of tape\n");
 969         if (spcl.c_magic != FS_UFS2_MAGIC)
 970                 panic("not at beginning of a file\n");
 971         if (!gettingfile && setjmp(restart) != 0)
 972                 return;
 973         gettingfile++;
 974         fillit = datafill;
 975         if (size == 0 && attrsize > 0) {
 976                 fillit = attrfill;
 977                 size = attrsize;
 978                 attrsize = 0;
 979         }
 980 loop:
 981         for (i = 0; i < spcl.c_count; i++) {
 982                 if (!readmapflag && i > TP_NINDIR) {
 983                         if (Dflag) {
 984                                 fprintf(stderr, "spcl.c_count = %jd\n",
 985                                     (intmax_t)spcl.c_count);
 986                                 break;
 987                         } else
 988                                 panic("spcl.c_count = %jd\n",
 989                                     (intmax_t)spcl.c_count);
 990                 }
 991                 if (readmapflag || spcl.c_addr[i]) {
 992                         readtape(&buf[curblk++][0]);
 993                         if (curblk == fssize / TP_BSIZE) {
 994                                 skiphole(skip, &seekpos);
 995                                 (*fillit)((char *)buf, (long)(size > TP_BSIZE ?
 996                                      fssize : (curblk - 1) * TP_BSIZE + size));
 997                                 curblk = 0;
 998                         }
 999                 } else {
1000                         if (curblk > 0) {
1001                                 skiphole(skip, &seekpos);
1002                                 (*fillit)((char *)buf, (long)(size > TP_BSIZE ?
1003                                      curblk * TP_BSIZE :
1004                                      (curblk - 1) * TP_BSIZE + size));
1005                                 curblk = 0;
1006                         }
1007                         /*
1008                          * We have a block of a hole. Don't skip it
1009                          * now, because there may be next adjacent
1010                          * block of the hole in the file. Postpone the
1011                          * seek until next file write.
1012                          */
1013                         seekpos += (long)MIN(TP_BSIZE, size);
1014                 }
1015                 if ((size -= TP_BSIZE) <= 0) {
1016                         if (size > -TP_BSIZE && curblk > 0) {
1017                                 skiphole(skip, &seekpos);
1018                                 (*fillit)((char *)buf,
1019                                         (long)((curblk * TP_BSIZE) + size));
1020                                 curblk = 0;
1021                         }
1022                         if (attrsize > 0) {
1023                                 fillit = attrfill;
1024                                 size = attrsize;
1025                                 attrsize = 0;
1026                                 continue;
1027                         }
1028                         if (spcl.c_count - i > 1)
1029                                 dprintf(stdout, "skipping %d junk block(s)\n",
1030                                         spcl.c_count - i - 1);
1031                         for (i++; i < spcl.c_count; i++) {
1032                                 if (!readmapflag && i > TP_NINDIR) {
1033                                         if (Dflag) {
1034                                                 fprintf(stderr,
1035                                                     "spcl.c_count = %jd\n",
1036                                                     (intmax_t)spcl.c_count);
1037                                                 break;
1038                                         } else
1039                                                 panic("spcl.c_count = %jd\n",
1040                                                     (intmax_t)spcl.c_count);
1041                                 }
1042                                 if (readmapflag || spcl.c_addr[i])
1043                                         readtape(junk);
1044                         }
1045                         break;
1046                 }
1047         }
1048         if (gethead(&spcl) == GOOD && size > 0) {
1049                 if (spcl.c_type == TS_ADDR)
1050                         goto loop;
1051                 dprintf(stdout,
1052                         "Missing address (header) block for %s at %ld blocks\n",
1053                         curfile.name, blksread);
1054         }
1055         if (curblk > 0)
1056                 panic("getfile: lost data\n");
1057         findinode(&spcl);
1058         gettingfile = 0;
1059 }
1060
1061 /*
1062  * These variables are shared between the next two functions.
1063  */
1064 static int extbufsize = 0;
1065 static char *extbuf;
1066 static int extloc;
1067
1068 /*
1069  * Allocate a buffer into which to extract extended attributes.
1070  */
1071 static char *
1072 setupextattr(int extsize)
1073 {
1074
1075         extloc = 0;
1076         if (extsize <= extbufsize)
1077                 return (extbuf);
1078         if (extbufsize > 0)
1079                 free(extbuf);
1080         if ((extbuf = malloc(extsize)) != NULL) {
1081                 extbufsize = extsize;
1082                 return (extbuf);
1083         }
1084         extbufsize = 0;
1085         extbuf = NULL;
1086         fprintf(stderr, "Cannot extract %d bytes %s for inode %ju, name %s\n",
1087             extsize, "of extended attributes", (uintmax_t)curfile.ino,
1088             curfile.name);
1089         return (NULL);
1090 }
1091
1092 /*
1093  * Extract the next block of extended attributes.
1094  */
1095 static void
1096 xtrattr(char *buf, size_t size)
1097 {
1098
1099         if (extloc + size > extbufsize)
1100                 panic("overrun attribute buffer\n");
1101         memmove(&extbuf[extloc], buf, size);
1102         extloc += size;
1103 }
1104
1105 /*
1106  * Write out the next block of a file.
1107  */
1108 static void
1109 xtrfile(char *buf, size_t size)
1110 {
1111
1112         if (Nflag)
1113                 return;
1114         if (write(ofile, buf, (int) size) == -1) {
1115                 fprintf(stderr,
1116                     "write error extracting inode %ju, name %s\nwrite: %s\n",
1117                     (uintmax_t)curfile.ino, curfile.name, strerror(errno));
1118         }
1119 }
1120
1121 /*
1122  * Skip over a hole in a file.
1123  */
1124 /* ARGSUSED */
1125 static void
1126 xtrskip(char *buf, size_t size)
1127 {
1128
1129         if (lseek(ofile, size, SEEK_CUR) == -1) {
1130                 fprintf(stderr,
1131                     "seek error extracting inode %ju, name %s\nlseek: %s\n",
1132                     (uintmax_t)curfile.ino, curfile.name, strerror(errno));
1133                 done(1);
1134         }
1135 }
1136
1137 /*
1138  * Collect the next block of a symbolic link.
1139  */
1140 static void
1141 xtrlnkfile(char *buf, size_t size)
1142 {
1143
1144         pathlen += size;
1145         if (pathlen > MAXPATHLEN) {
1146                 fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n",
1147                     curfile.name, lnkbuf, buf, pathlen);
1148                 done(1);
1149         }
1150         (void) strcat(lnkbuf, buf);
1151 }
1152
1153 /*
1154  * Skip over a hole in a symbolic link (should never happen).
1155  */
1156 /* ARGSUSED */
1157 static void
1158 xtrlnkskip(char *buf, size_t size)
1159 {
1160
1161         fprintf(stderr, "unallocated block in symbolic link %s\n",
1162                 curfile.name);
1163         done(1);
1164 }
1165
1166 /*
1167  * Collect the next block of a bit map.
1168  */
1169 static void
1170 xtrmap(char *buf, size_t size)
1171 {
1172
1173         memmove(map, buf, size);
1174         map += size;
1175 }
1176
1177 /*
1178  * Skip over a hole in a bit map (should never happen).
1179  */
1180 /* ARGSUSED */
1181 static void
1182 xtrmapskip(char *buf, size_t size)
1183 {
1184
1185         panic("hole in map\n");
1186         map += size;
1187 }
1188
1189 /*
1190  * Noop, when an extraction function is not needed.
1191  */
1192 /* ARGSUSED */
1193 void
1194 xtrnull(char *buf, size_t size)
1195 {
1196
1197         return;
1198 }
1199
1200 /*
1201  * Read TP_BSIZE blocks from the input.
1202  * Handle read errors, and end of media.
1203  */
1204 static void
1205 readtape(char *buf)
1206 {
1207         long rd, newvol, i, oldnumtrec;
1208         int cnt, seek_failed;
1209
1210         if (blkcnt + (byteslide > 0) < numtrec) {
1211                 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE) + byteslide], (long)TP_BSIZE);
1212                 blksread++;
1213                 tapeaddr++;
1214                 return;
1215         }
1216         if (numtrec > 0)
1217                 memmove(&tapebuf[-TP_BSIZE],
1218                     &tapebuf[(numtrec-1) * TP_BSIZE], (long)TP_BSIZE);
1219         oldnumtrec = numtrec;
1220         for (i = 0; i < ntrec; i++)
1221                 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
1222         if (numtrec == 0)
1223                 numtrec = ntrec;
1224         cnt = ntrec * TP_BSIZE;
1225         rd = 0;
1226 getmore:
1227 #ifdef RRESTORE
1228         if (host)
1229                 i = rmtread(&tapebuf[rd], cnt);
1230         else
1231 #endif
1232                 i = read(mt, &tapebuf[rd], cnt);
1233         /*
1234          * Check for mid-tape short read error.
1235          * If found, skip rest of buffer and start with the next.
1236          */
1237         if (!pipein && !pipecmdin && numtrec < ntrec && i > 0) {
1238                 dprintf(stdout, "mid-media short read error.\n");
1239                 numtrec = ntrec;
1240         }
1241         /*
1242          * Handle partial block read.
1243          */
1244         if ((pipein || pipecmdin) && i == 0 && rd > 0)
1245                 i = rd;
1246         else if (i > 0 && i != ntrec * TP_BSIZE) {
1247                 if (pipein || pipecmdin) {
1248                         rd += i;
1249                         cnt -= i;
1250                         if (cnt > 0)
1251                                 goto getmore;
1252                         i = rd;
1253                 } else {
1254                         /*
1255                          * Short read. Process the blocks read.
1256                          */
1257                         if (i % TP_BSIZE != 0)
1258                                 vprintf(stdout,
1259                                     "partial block read: %ld should be %ld\n",
1260                                     i, ntrec * TP_BSIZE);
1261                         numtrec = i / TP_BSIZE;
1262                 }
1263         }
1264         /*
1265          * Handle read error.
1266          */
1267         if (i < 0) {
1268                 fprintf(stderr, "Tape read error while ");
1269                 switch (curfile.action) {
1270                 default:
1271                         fprintf(stderr, "trying to set up tape\n");
1272                         break;
1273                 case UNKNOWN:
1274                         fprintf(stderr, "trying to resynchronize\n");
1275                         break;
1276                 case USING:
1277                         fprintf(stderr, "restoring %s\n", curfile.name);
1278                         break;
1279                 case SKIP:
1280                         fprintf(stderr, "skipping over inode %ju\n",
1281                             (uintmax_t)curfile.ino);
1282                         break;
1283                 }
1284                 if (!yflag && !reply("continue"))
1285                         done(1);
1286                 i = ntrec * TP_BSIZE;
1287                 memset(tapebuf, 0, i);
1288 #ifdef RRESTORE
1289                 if (host)
1290                         seek_failed = (rmtseek(i, 1) < 0);
1291                 else
1292 #endif
1293                         seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1);
1294
1295                 if (seek_failed) {
1296                         fprintf(stderr,
1297                             "continuation failed: %s\n", strerror(errno));
1298                         done(1);
1299                 }
1300         }
1301         /*
1302          * Handle end of tape.
1303          */
1304         if (i == 0) {
1305                 vprintf(stdout, "End-of-tape encountered\n");
1306                 if (!pipein) {
1307                         newvol = volno + 1;
1308                         volno = 0;
1309                         numtrec = 0;
1310                         getvol(newvol);
1311                         readtape(buf);
1312                         return;
1313                 }
1314                 if (rd % TP_BSIZE != 0)
1315                         panic("partial block read: %ld should be %ld\n",
1316                                 rd, ntrec * TP_BSIZE);
1317                 terminateinput();
1318                 memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE);
1319         }
1320         if (oldnumtrec == 0)
1321                 blkcnt = 0;
1322         else
1323                 blkcnt -= oldnumtrec;
1324         memmove(buf,
1325             &tapebuf[(blkcnt++ * TP_BSIZE) + byteslide], (long)TP_BSIZE);
1326         blksread++;
1327         tapeaddr++;
1328 }
1329
1330 static void
1331 findtapeblksize(void)
1332 {
1333         long i;
1334
1335         for (i = 0; i < ntrec; i++)
1336                 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
1337         blkcnt = 0;
1338 #ifdef RRESTORE
1339         if (host)
1340                 i = rmtread(tapebuf, ntrec * TP_BSIZE);
1341         else
1342 #endif
1343                 i = read(mt, tapebuf, ntrec * TP_BSIZE);
1344
1345         if (i <= 0) {
1346                 fprintf(stderr, "tape read error: %s\n", strerror(errno));
1347                 done(1);
1348         }
1349         if (i % TP_BSIZE != 0) {
1350                 fprintf(stderr, "Tape block size (%ld) %s (%d)\n",
1351                         i, "is not a multiple of dump block size", TP_BSIZE);
1352                 done(1);
1353         }
1354         ntrec = i / TP_BSIZE;
1355         numtrec = ntrec;
1356         vprintf(stdout, "Tape block size is %ld\n", ntrec);
1357 }
1358
1359 void
1360 closemt(void)
1361 {
1362
1363         if (mt < 0)
1364                 return;
1365         if (pipecmdin) {
1366                 pclose(popenfp);
1367                 popenfp = NULL;
1368         } else
1369 #ifdef RRESTORE
1370         if (host)
1371                 rmtclose();
1372         else
1373 #endif
1374                 (void) close(mt);
1375 }
1376
1377 /*
1378  * Read the next block from the tape.
1379  * If it is not any valid header, return an error.
1380  */
1381 static int
1382 gethead(struct s_spcl *buf)
1383 {
1384         long i;
1385
1386         readtape((char *)buf);
1387         if (buf->c_magic != FS_UFS2_MAGIC && buf->c_magic != NFS_MAGIC) {
1388                 if (buf->c_magic == OFS_MAGIC) {
1389                         fprintf(stderr,
1390                             "Format of dump tape is too old. Must use\n");
1391                         fprintf(stderr,
1392                             "a version of restore from before 2002.\n");
1393                         return (FAIL);
1394                 }
1395                 if (swabl(buf->c_magic) != FS_UFS2_MAGIC &&
1396                     buf->c_magic != NFS_MAGIC) {
1397                         if (buf->c_magic == OFS_MAGIC) {
1398                                 fprintf(stderr,
1399                                   "Format of dump tape is too old. Must use\n");
1400                                 fprintf(stderr,
1401                                   "a version of restore from before 2002.\n");
1402                         }
1403                         return (FAIL);
1404                 }
1405                 if (!Bcvt) {
1406                         vprintf(stdout, "Note: Doing Byte swapping\n");
1407                         Bcvt = 1;
1408                 }
1409         }
1410         if (checksum((int *)buf) == FAIL)
1411                 return (FAIL);
1412         if (Bcvt) {
1413                 swabst((u_char *)"8l4s1q8l2q17l", (u_char *)buf);
1414                 swabst((u_char *)"l",(u_char *) &buf->c_level);
1415                 swabst((u_char *)"2l4q",(u_char *) &buf->c_flags);
1416         }
1417         readmapflag = 0;
1418
1419         switch (buf->c_type) {
1420
1421         case TS_CLRI:
1422         case TS_BITS:
1423                 /*
1424                  * Have to patch up missing information in bit map headers
1425                  */
1426                 buf->c_size = buf->c_count * TP_BSIZE;
1427                 if (buf->c_count > TP_NINDIR)
1428                         readmapflag = 1;
1429                 else
1430                         for (i = 0; i < buf->c_count; i++)
1431                                 buf->c_addr[i]++;
1432                 /* FALL THROUGH */
1433
1434         case TS_TAPE:
1435                 if (buf->c_magic == NFS_MAGIC &&
1436                     (buf->c_flags & NFS_DR_NEWINODEFMT) == 0)
1437                         oldinofmt = 1;
1438                 /* FALL THROUGH */
1439
1440         case TS_END:
1441                 buf->c_inumber = 0;
1442                 /* FALL THROUGH */
1443
1444         case TS_ADDR:
1445         case TS_INODE:
1446                 /*
1447                  * For old dump tapes, have to copy up old fields to
1448                  * new locations.
1449                  */
1450                 if (buf->c_magic == NFS_MAGIC) {
1451                         buf->c_tapea = buf->c_old_tapea;
1452                         buf->c_firstrec = buf->c_old_firstrec;
1453                         buf->c_date = _time32_to_time(buf->c_old_date);
1454                         buf->c_ddate = _time32_to_time(buf->c_old_ddate);
1455                         buf->c_atime = _time32_to_time(buf->c_old_atime);
1456                         buf->c_mtime = _time32_to_time(buf->c_old_mtime);
1457                         buf->c_birthtime = 0;
1458                         buf->c_birthtimensec = 0;
1459                         buf->c_extsize = 0;
1460                 }
1461                 break;
1462
1463         default:
1464                 panic("gethead: unknown inode type %d\n", buf->c_type);
1465                 break;
1466         }
1467         if (dumpdate != 0 && _time64_to_time(buf->c_date) != dumpdate)
1468                 fprintf(stderr, "Header with wrong dumpdate.\n");
1469         /*
1470          * If we're restoring a filesystem with the old (FreeBSD 1)
1471          * format inodes, copy the uid/gid to the new location
1472          */
1473         if (oldinofmt) {
1474                 buf->c_uid = buf->c_spare1[1];
1475                 buf->c_gid = buf->c_spare1[2];
1476         }
1477         buf->c_magic = FS_UFS2_MAGIC;
1478         tapeaddr = buf->c_tapea;
1479         if (dflag)
1480                 accthdr(buf);
1481         return(GOOD);
1482 }
1483
1484 /*
1485  * Check that a header is where it belongs and predict the next header
1486  */
1487 static void
1488 accthdr(struct s_spcl *header)
1489 {
1490         static ino_t previno = 0x7fffffff;
1491         static int prevtype;
1492         static long predict;
1493         long blks, i;
1494
1495         if (header->c_type == TS_TAPE) {
1496                 fprintf(stderr, "Volume header ");
1497                 if (header->c_firstrec)
1498                         fprintf(stderr, "begins with record %jd",
1499                             (intmax_t)header->c_firstrec);
1500                 fprintf(stderr, "\n");
1501                 previno = 0x7fffffff;
1502                 return;
1503         }
1504         if (previno == 0x7fffffff)
1505                 goto newcalc;
1506         switch (prevtype) {
1507         case TS_BITS:
1508                 fprintf(stderr, "Dumped inodes map header");
1509                 break;
1510         case TS_CLRI:
1511                 fprintf(stderr, "Used inodes map header");
1512                 break;
1513         case TS_INODE:
1514                 fprintf(stderr, "File header, ino %ju", (uintmax_t)previno);
1515                 break;
1516         case TS_ADDR:
1517                 fprintf(stderr, "File continuation header, ino %ju",
1518                     (uintmax_t)previno);
1519                 break;
1520         case TS_END:
1521                 fprintf(stderr, "End of tape header");
1522                 break;
1523         }
1524         if (predict != blksread - 1)
1525                 fprintf(stderr, "; predicted %ld blocks, got %ld blocks",
1526                         predict, blksread - 1);
1527         fprintf(stderr, "\n");
1528 newcalc:
1529         blks = 0;
1530         if (header->c_type != TS_END)
1531                 for (i = 0; i < header->c_count; i++)
1532                         if (readmapflag || header->c_addr[i] != 0)
1533                                 blks++;
1534         predict = blks;
1535         blksread = 0;
1536         prevtype = header->c_type;
1537         previno = header->c_inumber;
1538 }
1539
1540 /*
1541  * Find an inode header.
1542  * Complain if had to skip.
1543  */
1544 static void
1545 findinode(struct s_spcl *header)
1546 {
1547         static long skipcnt = 0;
1548         long i;
1549         char buf[TP_BSIZE];
1550         int htype;
1551
1552         curfile.name = "<name unknown>";
1553         curfile.action = UNKNOWN;
1554         curfile.mode = 0;
1555         curfile.ino = 0;
1556         do {
1557                 htype = header->c_type;
1558                 switch (htype) {
1559
1560                 case TS_ADDR:
1561                         /*
1562                          * Skip up to the beginning of the next record
1563                          */
1564                         for (i = 0; i < header->c_count; i++)
1565                                 if (header->c_addr[i])
1566                                         readtape(buf);
1567                         while (gethead(header) == FAIL ||
1568                             _time64_to_time(header->c_date) != dumpdate) {
1569                                 skipcnt++;
1570                                 if (Dflag) {
1571                                         byteslide++;
1572                                         if (byteslide < TP_BSIZE) {
1573                                                 blkcnt--;
1574                                                 blksread--;
1575                                         } else
1576                                                 byteslide = 0;
1577                                 }
1578                         }
1579                         break;
1580
1581                 case TS_INODE:
1582                         curfile.mode = header->c_mode;
1583                         curfile.uid = header->c_uid;
1584                         curfile.gid = header->c_gid;
1585                         curfile.file_flags = header->c_file_flags;
1586                         curfile.rdev = header->c_rdev;
1587                         curfile.atime_sec = header->c_atime;
1588                         curfile.atime_nsec = header->c_atimensec;
1589                         curfile.mtime_sec = header->c_mtime;
1590                         curfile.mtime_nsec = header->c_mtimensec;
1591                         curfile.birthtime_sec = header->c_birthtime;
1592                         curfile.birthtime_nsec = header->c_birthtimensec;
1593                         curfile.extsize = header->c_extsize;
1594                         curfile.size = header->c_size;
1595                         curfile.ino = header->c_inumber;
1596                         break;
1597
1598                 case TS_END:
1599                         /* If we missed some tapes, get another volume. */
1600                         if (tapesread & (tapesread + 1)) {
1601                                 getvol(0);
1602                                 continue;
1603                         }
1604                         curfile.ino = maxino;
1605                         break;
1606
1607                 case TS_CLRI:
1608                         curfile.name = "<file removal list>";
1609                         break;
1610
1611                 case TS_BITS:
1612                         curfile.name = "<file dump list>";
1613                         break;
1614
1615                 case TS_TAPE:
1616                         if (Dflag)
1617                                 fprintf(stderr, "unexpected tape header\n");
1618                         else
1619                                 panic("unexpected tape header\n");
1620
1621                 default:
1622                         if (Dflag)
1623                                 fprintf(stderr, "unknown tape header type %d\n",
1624                                     spcl.c_type);
1625                         else
1626                                 panic("unknown tape header type %d\n",
1627                                     spcl.c_type);
1628                         while (gethead(header) == FAIL ||
1629                             _time64_to_time(header->c_date) != dumpdate) {
1630                                 skipcnt++;
1631                                 if (Dflag) {
1632                                         byteslide++;
1633                                         if (byteslide < TP_BSIZE) {
1634                                                 blkcnt--;
1635                                                 blksread--;
1636                                         } else
1637                                                 byteslide = 0;
1638                                 }
1639                         }
1640
1641                 }
1642         } while (htype == TS_ADDR);
1643         if (skipcnt > 0)
1644                 fprintf(stderr, "resync restore, skipped %ld %s\n",
1645                     skipcnt, Dflag ? "bytes" : "blocks");
1646         skipcnt = 0;
1647 }
1648
1649 static int
1650 checksum(int *buf)
1651 {
1652         int i, j;
1653
1654         j = sizeof(union u_spcl) / sizeof(int);
1655         i = 0;
1656         if (!Bcvt) {
1657                 do
1658                         i += *buf++;
1659                 while (--j);
1660         } else {
1661                 /* What happens if we want to read restore tapes
1662                         for a 16bit int machine??? */
1663                 do
1664                         i += swabl(*buf++);
1665                 while (--j);
1666         }
1667
1668         if (i != CHECKSUM) {
1669                 fprintf(stderr, "Checksum error %o, inode %ju file %s\n", i,
1670                     (uintmax_t)curfile.ino, curfile.name);
1671                 return(FAIL);
1672         }
1673         return(GOOD);
1674 }
1675
1676 #ifdef RRESTORE
1677 #include <stdarg.h>
1678
1679 void
1680 msg(const char *fmt, ...)
1681 {
1682         va_list ap;
1683         va_start(ap, fmt);
1684         (void)vfprintf(stderr, fmt, ap);
1685         va_end(ap);
1686 }
1687 #endif /* RRESTORE */
1688
1689 static u_char *
1690 swabshort(u_char *sp, int n)
1691 {
1692         char c;
1693
1694         while (--n >= 0) {
1695                 c = sp[0]; sp[0] = sp[1]; sp[1] = c;
1696                 sp += 2;
1697         }
1698         return (sp);
1699 }
1700
1701 static u_char *
1702 swablong(u_char *sp, int n)
1703 {
1704         char c;
1705
1706         while (--n >= 0) {
1707                 c = sp[0]; sp[0] = sp[3]; sp[3] = c;
1708                 c = sp[2]; sp[2] = sp[1]; sp[1] = c;
1709                 sp += 4;
1710         }
1711         return (sp);
1712 }
1713
1714 static u_char *
1715 swabquad(u_char *sp, int n)
1716 {
1717         char c;
1718
1719         while (--n >= 0) {
1720                 c = sp[0]; sp[0] = sp[7]; sp[7] = c;
1721                 c = sp[1]; sp[1] = sp[6]; sp[6] = c;
1722                 c = sp[2]; sp[2] = sp[5]; sp[5] = c;
1723                 c = sp[3]; sp[3] = sp[4]; sp[4] = c;
1724                 sp += 8;
1725         }
1726         return (sp);
1727 }
1728
1729 void
1730 swabst(u_char *cp, u_char *sp)
1731 {
1732         int n = 0;
1733
1734         while (*cp) {
1735                 switch (*cp) {
1736                 case '0': case '1': case '2': case '3': case '4':
1737                 case '5': case '6': case '7': case '8': case '9':
1738                         n = (n * 10) + (*cp++ - '0');
1739                         continue;
1740
1741                 case 's': case 'w': case 'h':
1742                         if (n == 0)
1743                                 n = 1;
1744                         sp = swabshort(sp, n);
1745                         break;
1746
1747                 case 'l':
1748                         if (n == 0)
1749                                 n = 1;
1750                         sp = swablong(sp, n);
1751                         break;
1752
1753                 case 'q':
1754                         if (n == 0)
1755                                 n = 1;
1756                         sp = swabquad(sp, n);
1757                         break;
1758
1759                 case 'b':
1760                         if (n == 0)
1761                                 n = 1;
1762                         sp += n;
1763                         break;
1764
1765                 default:
1766                         fprintf(stderr, "Unknown conversion character: %c\n",
1767                             *cp);
1768                         done(0);
1769                         break;
1770                 }
1771                 cp++;
1772                 n = 0;
1773         }
1774 }
1775
1776 static u_long
1777 swabl(u_long x)
1778 {
1779         swabst((u_char *)"l", (u_char *)&x);
1780         return (x);
1781 }