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