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         setuid(getuid());       /* no longer need or want root privileges */
 168         magtape = strdup(source);
 169         if (magtape == NULL) {
 170                 fprintf(stderr, "Cannot allocate space for magtape buffer\n");
 171                 done(1);
 172         }
 173 }
 174
 175 void
 176 newtapebuf(long size)
 177 {
 178         static int tapebufsize = -1;
 179
 180         ntrec = size;
 181         if (size <= tapebufsize)
 182                 return;
 183         if (tapebuf != NULL)
 184                 free(tapebuf - TP_BSIZE);
 185         tapebuf = malloc((size+1) * TP_BSIZE);
 186         if (tapebuf == NULL) {
 187                 fprintf(stderr, "Cannot allocate space for tape buffer\n");
 188                 done(1);
 189         }
 190         tapebuf += TP_BSIZE;
 191         tapebufsize = size;
 192 }
 193
 194 /*
 195  * Verify that the tape drive can be accessed and
 196  * that it actually is a dump tape.
 197  */
 198 void
 199 setup(void)
 200 {
 201         int i, j, *ip;
 202         struct stat stbuf;
 203
 204         vprintf(stdout, "Verify tape and initialize maps\n");
 205         if (pipecmdin) {
 206                 if (setenv("RESTORE_VOLUME", "1", 1) == -1) {
 207                         fprintf(stderr, "Cannot set $RESTORE_VOLUME: %s\n",
 208                             strerror(errno));
 209                         done(1);
 210                 }
 211                 popenfp = popen(magtape, "r");
 212                 mt = popenfp ? fileno(popenfp) : -1;
 213         } else
 214 #ifdef RRESTORE
 215         if (host)
 216                 mt = rmtopen(magtape, 0);
 217         else
 218 #endif
 219         if (pipein)
 220                 mt = 0;
 221         else
 222                 mt = open(magtape, O_RDONLY, 0);
 223         if (mt < 0) {
 224                 fprintf(stderr, "%s: %s\n", magtape, strerror(errno));
 225                 done(1);
 226         }
 227         volno = 1;
 228         setdumpnum();
 229         FLUSHTAPEBUF();
 230         if (!pipein && !bflag)
 231                 findtapeblksize();
 232         if (gethead(&spcl) == FAIL) {
 233                 fprintf(stderr, "Tape is not a dump tape\n");
 234                 done(1);
 235         }
 236         if (pipein) {
 237                 endoftapemark.s_spcl.c_magic = FS_UFS2_MAGIC;
 238                 endoftapemark.s_spcl.c_type = TS_END;
 239                 ip = (int *)&endoftapemark;
 240                 j = sizeof(union u_spcl) / sizeof(int);
 241                 i = 0;
 242                 do
 243                         i += *ip++;
 244                 while (--j);
 245                 endoftapemark.s_spcl.c_checksum = CHECKSUM - i;
 246         }
 247         if (vflag || command == 't')
 248                 printdumpinfo();
 249         dumptime = _time64_to_time(spcl.c_ddate);
 250         dumpdate = _time64_to_time(spcl.c_date);
 251         if (stat(".", &stbuf) < 0) {
 252                 fprintf(stderr, "cannot stat .: %s\n", strerror(errno));
 253                 done(1);
 254         }
 255         if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE )
 256                 fssize = TP_BSIZE;
 257         if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE)
 258                 fssize = stbuf.st_blksize;
 259         if (((fssize - 1) & fssize) != 0) {
 260                 fprintf(stderr, "bad block size %ld\n", fssize);
 261                 done(1);
 262         }
 263         if (spcl.c_volume != 1) {
 264                 fprintf(stderr, "Tape is not volume 1 of the dump\n");
 265                 done(1);
 266         }
 267         if (gethead(&spcl) == FAIL) {
 268                 dprintf(stdout, "header read failed at %ld blocks\n", blksread);
 269                 panic("no header after volume mark!\n");
 270         }
 271         findinode(&spcl);
 272         if (spcl.c_type != TS_CLRI) {
 273                 fprintf(stderr, "Cannot find file removal list\n");
 274                 done(1);
 275         }
 276         maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
 277         dprintf(stdout, "maxino = %d\n", maxino);
 278         map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
 279         if (map == NULL)
 280                 panic("no memory for active inode map\n");
 281         usedinomap = map;
 282         curfile.action = USING;
 283         getfile(xtrmap, xtrmapskip, xtrmapskip);
 284         if (spcl.c_type != TS_BITS) {
 285                 fprintf(stderr, "Cannot find file dump list\n");
 286                 done(1);
 287         }
 288         map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
 289         if (map == (char *)NULL)
 290                 panic("no memory for file dump list\n");
 291         dumpmap = map;
 292         curfile.action = USING;
 293         getfile(xtrmap, xtrmapskip, xtrmapskip);
 294         /*
 295          * If there may be whiteout entries on the tape, pretend that the
 296          * whiteout inode exists, so that the whiteout entries can be
 297          * extracted.
 298          */
 299         SETINO(WINO, dumpmap);
 300         /* 'r' restores don't call getvol() for tape 1, so mark it as read. */
 301         if (command == 'r')
 302                 tapesread = 1;
 303 }
 304
 305 /*
 306  * Prompt user to load a new dump volume.
 307  * "Nextvol" is the next suggested volume to use.
 308  * This suggested volume is enforced when doing full
 309  * or incremental restores, but can be overridden by
 310  * the user when only extracting a subset of the files.
 311  */
 312 void
 313 getvol(long nextvol)
 314 {
 315         int64_t prevtapea;
 316         long i, newvol, savecnt;
 317         union u_spcl tmpspcl;
 318 #       define tmpbuf tmpspcl.s_spcl
 319         char buf[TP_BSIZE];
 320
 321         if (nextvol == 1) {
 322                 tapesread = 0;
 323                 gettingfile = 0;
 324         }
 325         prevtapea = tapeaddr;
 326         savecnt = blksread;
 327         if (pipein) {
 328                 if (nextvol != 1) {
 329                         panic("Changing volumes on pipe input?\n");
 330                         /* Avoid looping if we couldn't ask the user. */
 331                         if (yflag || ferror(terminal) || feof(terminal))
 332                                 done(1);
 333                 }
 334                 if (volno == 1)
 335                         return;
 336                 if (pipecmdin) {
 337                         closemt();
 338                         goto getpipecmdhdr;
 339                 }
 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 getpipecmdhdr:
 404                 (void)sprintf(volno, "%d", newvol);
 405                 if (setenv("RESTORE_VOLUME", volno, 1) == -1) {
 406                         fprintf(stderr, "Cannot set $RESTORE_VOLUME: %s\n",
 407                             strerror(errno));
 408                         done(1);
 409                 }
 410                 popenfp = popen(magtape, "r");
 411                 mt = popenfp ? fileno(popenfp) : -1;
 412         } else
 413 #ifdef RRESTORE
 414         if (host)
 415                 mt = rmtopen(magtape, 0);
 416         else
 417 #endif
 418                 mt = open(magtape, O_RDONLY, 0);
 419
 420         if (mt == -1) {
 421                 fprintf(stderr, "Cannot open %s\n", magtape);
 422                 volno = -1;
 423                 goto again;
 424         }
 425 gethdr:
 426         volno = newvol;
 427         setdumpnum();
 428         FLUSHTAPEBUF();
 429         if (gethead(&tmpbuf) == FAIL) {
 430                 dprintf(stdout, "header read failed at %ld blocks\n", blksread);
 431                 fprintf(stderr, "tape is not dump tape\n");
 432                 volno = 0;
 433                 goto again;
 434         }
 435         if (tmpbuf.c_volume != volno) {
 436                 fprintf(stderr, "Wrong volume (%ld)\n", 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 %qd, tape starts with %qd\n", prevtapea,
 458             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 %ld dump of %s on %s:%s\n",
 558                 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 = curfile.uid;
 586         gid = curfile.gid;
 587         mode = curfile.mode;
 588         flags = curfile.file_flags;
 589         switch (mode & IFMT) {
 590
 591         default:
 592                 fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode);
 593                 skipfile();
 594                 return (FAIL);
 595
 596         case IFSOCK:
 597                 vprintf(stdout, "skipped socket %s\n", name);
 598                 skipfile();
 599                 return (GOOD);
 600
 601         case IFDIR:
 602                 if (mflag) {
 603                         ep = lookupname(name);
 604                         if (ep == NULL || ep->e_flags & EXTRACT)
 605                                 panic("unextracted directory %s\n", name);
 606                         skipfile();
 607                         return (GOOD);
 608                 }
 609                 vprintf(stdout, "extract file %s\n", name);
 610                 return (genliteraldir(name, curfile.ino));
 611
 612         case IFLNK:
 613                 lnkbuf[0] = '\0';
 614                 pathlen = 0;
 615                 buf = setupextattr(extsize);
 616                 getfile(xtrlnkfile, xtrattr, xtrlnkskip);
 617                 if (pathlen == 0) {
 618                         vprintf(stdout,
 619                             "%s: zero length symbolic link (ignored)\n", name);
 620                         return (GOOD);
 621                 }
 622                 if (linkit(lnkbuf, name, SYMLINK) == GOOD) {
 623                         if (extsize > 0)
 624                                 set_extattr_link(name, buf, extsize);
 625                         (void) lchown(name, uid, gid);
 626                         (void) lchmod(name, mode);
 627                         (void) lutimes(name, ctimep);
 628                         (void) lutimes(name, mtimep);
 629                         (void) lchflags(name, flags);
 630                         return (GOOD);
 631                 }
 632                 return (FAIL);
 633
 634         case IFIFO:
 635                 vprintf(stdout, "extract fifo %s\n", name);
 636                 if (Nflag) {
 637                         skipfile();
 638                         return (GOOD);
 639                 }
 640                 if (uflag)
 641                         (void) unlink(name);
 642                 if (mkfifo(name, 0600) < 0) {
 643                         fprintf(stderr, "%s: cannot create fifo: %s\n",
 644                             name, strerror(errno));
 645                         skipfile();
 646                         return (FAIL);
 647                 }
 648                 if (extsize == 0) {
 649                         skipfile();
 650                 } else {
 651                         buf = setupextattr(extsize);
 652                         getfile(xtrnull, xtrattr, xtrnull);
 653                         set_extattr_file(name, buf, extsize);
 654                 }
 655                 (void) chown(name, uid, gid);
 656                 (void) chmod(name, mode);
 657                 (void) utimes(name, ctimep);
 658                 (void) utimes(name, mtimep);
 659                 (void) chflags(name, flags);
 660                 return (GOOD);
 661
 662         case IFCHR:
 663         case IFBLK:
 664                 vprintf(stdout, "extract special file %s\n", name);
 665                 if (Nflag) {
 666                         skipfile();
 667                         return (GOOD);
 668                 }
 669                 if (uflag)
 670                         (void) unlink(name);
 671                 if (mknod(name, (mode & (IFCHR | IFBLK)) | 0600,
 672                     (int)curfile.rdev) < 0) {
 673                         fprintf(stderr, "%s: cannot create special file: %s\n",
 674                             name, strerror(errno));
 675                         skipfile();
 676                         return (FAIL);
 677                 }
 678                 if (extsize == 0) {
 679                         skipfile();
 680                 } else {
 681                         buf = setupextattr(extsize);
 682                         getfile(xtrnull, xtrattr, xtrnull);
 683                         set_extattr_file(name, buf, extsize);
 684                 }
 685                 (void) chown(name, uid, gid);
 686                 (void) chmod(name, mode);
 687                 (void) utimes(name, ctimep);
 688                 (void) utimes(name, mtimep);
 689                 (void) chflags(name, flags);
 690                 return (GOOD);
 691
 692         case IFREG:
 693                 vprintf(stdout, "extract file %s\n", name);
 694                 if (Nflag) {
 695                         skipfile();
 696                         return (GOOD);
 697                 }
 698                 if (uflag)
 699                         (void) unlink(name);
 700                 if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC,
 701                     0600)) < 0) {
 702                         fprintf(stderr, "%s: cannot create file: %s\n",
 703                             name, strerror(errno));
 704                         skipfile();
 705                         return (FAIL);
 706                 }
 707                 buf = setupextattr(extsize);
 708                 getfile(xtrfile, xtrattr, xtrskip);
 709                 if (extsize > 0)
 710                         set_extattr_fd(ofile, name, buf, extsize);
 711                 (void) fchown(ofile, uid, gid);
 712                 (void) fchmod(ofile, mode);
 713                 (void) futimes(ofile, ctimep);
 714                 (void) futimes(ofile, mtimep);
 715                 (void) fchflags(ofile, flags);
 716                 (void) close(ofile);
 717                 return (GOOD);
 718         }
 719         /* NOTREACHED */
 720 }
 721
 722 /*
 723  * Set attributes for a file.
 724  */
 725 void
 726 set_extattr_file(char *name, void *buf, int size)
 727 {
 728         struct extattr *eap, *eaend;
 729
 730         vprintf(stdout, "Set attributes for %s:", name);
 731         eaend = buf + size;
 732         for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
 733                 /*
 734                  * Make sure this entry is complete.
 735                  */
 736                 if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
 737                         dprintf(stdout, "\n\t%scorrupted",
 738                                 eap == buf ? "" : "remainder ");
 739                         break;
 740                 }
 741                 if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
 742                         continue;
 743                 vprintf(stdout, "\n\t%s, (%d bytes), %*s",
 744                         namespace_names[eap->ea_namespace], eap->ea_length,
 745                         eap->ea_namelength, eap->ea_name);
 746                 /*
 747                  * First we try the general attribute setting interface.
 748                  * However, some attributes can only be set by root or
 749                  * by using special interfaces (for example, ACLs).
 750                  */
 751                 if (extattr_set_file(name, eap->ea_namespace, eap->ea_name,
 752                     EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
 753                         dprintf(stdout, " (set using extattr_set_file)");
 754                         continue;
 755                 }
 756                 /*
 757                  * If the general interface refuses to set the attribute,
 758                  * then we try all the specialized interfaces that we
 759                  * know about.
 760                  */
 761                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 762                     !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
 763                         if (acl_set_file(name, ACL_TYPE_ACCESS,
 764                             EXTATTR_CONTENT(eap)) != -1) {
 765                                 dprintf(stdout, " (set using acl_set_file)");
 766                                 continue;
 767                         }
 768                 }
 769                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 770                     !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
 771                         if (acl_set_file(name, ACL_TYPE_DEFAULT,
 772                             EXTATTR_CONTENT(eap)) != -1) {
 773                                 dprintf(stdout, " (set using acl_set_file)");
 774                                 continue;
 775                         }
 776                 }
 777                 vprintf(stdout, " (unable to set)");
 778         }
 779         vprintf(stdout, "\n");
 780 }
 781
 782 /*
 783  * Set attributes for a symbolic link.
 784  */
 785 static void
 786 set_extattr_link(char *name, void *buf, int size)
 787 {
 788         struct extattr *eap, *eaend;
 789
 790         vprintf(stdout, "Set attributes for %s:", name);
 791         eaend = buf + size;
 792         for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
 793                 /*
 794                  * Make sure this entry is complete.
 795                  */
 796                 if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
 797                         dprintf(stdout, "\n\t%scorrupted",
 798                                 eap == buf ? "" : "remainder ");
 799                         break;
 800                 }
 801                 if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
 802                         continue;
 803                 vprintf(stdout, "\n\t%s, (%d bytes), %*s",
 804                         namespace_names[eap->ea_namespace], eap->ea_length,
 805                         eap->ea_namelength, eap->ea_name);
 806                 /*
 807                  * First we try the general attribute setting interface.
 808                  * However, some attributes can only be set by root or
 809                  * by using special interfaces (for example, ACLs).
 810                  */
 811                 if (extattr_set_link(name, eap->ea_namespace, eap->ea_name,
 812                     EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
 813                         dprintf(stdout, " (set using extattr_set_link)");
 814                         continue;
 815                 }
 816                 /*
 817                  * If the general interface refuses to set the attribute,
 818                  * then we try all the specialized interfaces that we
 819                  * know about.
 820                  */
 821                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 822                     !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
 823                         if (acl_set_link_np(name, ACL_TYPE_ACCESS,
 824                             EXTATTR_CONTENT(eap)) != -1) {
 825                                 dprintf(stdout, " (set using acl_set_link_np)");
 826                                 continue;
 827                         }
 828                 }
 829                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 830                     !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
 831                         if (acl_set_link_np(name, ACL_TYPE_DEFAULT,
 832                             EXTATTR_CONTENT(eap)) != -1) {
 833                                 dprintf(stdout, " (set using acl_set_link_np)");
 834                                 continue;
 835                         }
 836                 }
 837                 vprintf(stdout, " (unable to set)");
 838         }
 839         vprintf(stdout, "\n");
 840 }
 841
 842 /*
 843  * Set attributes on a file descriptor.
 844  */
 845 static void
 846 set_extattr_fd(int fd, char *name, void *buf, int size)
 847 {
 848         struct extattr *eap, *eaend;
 849
 850         vprintf(stdout, "Set attributes for %s:", name);
 851         eaend = buf + size;
 852         for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
 853                 /*
 854                  * Make sure this entry is complete.
 855                  */
 856                 if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
 857                         dprintf(stdout, "\n\t%scorrupted",
 858                                 eap == buf ? "" : "remainder ");
 859                         break;
 860                 }
 861                 if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
 862                         continue;
 863                 vprintf(stdout, "\n\t%s, (%d bytes), %*s",
 864                         namespace_names[eap->ea_namespace], eap->ea_length,
 865                         eap->ea_namelength, eap->ea_name);
 866                 /*
 867                  * First we try the general attribute setting interface.
 868                  * However, some attributes can only be set by root or
 869                  * by using special interfaces (for example, ACLs).
 870                  */
 871                 if (extattr_set_fd(fd, eap->ea_namespace, eap->ea_name,
 872                     EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
 873                         dprintf(stdout, " (set using extattr_set_fd)");
 874                         continue;
 875                 }
 876                 /*
 877                  * If the general interface refuses to set the attribute,
 878                  * then we try all the specialized interfaces that we
 879                  * know about.
 880                  */
 881                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 882                     !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
 883                         if (acl_set_fd(fd, EXTATTR_CONTENT(eap)) != -1) {
 884                                 dprintf(stdout, " (set using acl_set_fd)");
 885                                 continue;
 886                         }
 887                 }
 888                 if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
 889                     !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
 890                         if (acl_set_file(name, ACL_TYPE_DEFAULT,
 891                             EXTATTR_CONTENT(eap)) != -1) {
 892                                 dprintf(stdout, " (set using acl_set_file)");
 893                                 continue;
 894                         }
 895                 }
 896                 vprintf(stdout, " (unable to set)");
 897         }
 898         vprintf(stdout, "\n");
 899 }
 900
 901 /*
 902  * skip over bit maps on the tape
 903  */
 904 void
 905 skipmaps(void)
 906 {
 907
 908         while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI)
 909                 skipfile();
 910 }
 911
 912 /*
 913  * skip over a file on the tape
 914  */
 915 void
 916 skipfile(void)
 917 {
 918
 919         curfile.action = SKIP;
 920         getfile(xtrnull, xtrnull, xtrnull);
 921 }
 922
 923 /*
 924  * Extract a file from the tape.
 925  * When an allocated block is found it is passed to the fill function;
 926  * when an unallocated block (hole) is found, a zeroed buffer is passed
 927  * to the skip function.
 928  */
 929 void
 930 getfile(void (*datafill)(char *, long), void (*attrfill)(char *, long),
 931         void (*skip)(char *, long))
 932 {
 933         int i;
 934         off_t size;
 935         int curblk, attrsize;
 936         void (*fillit)(char *, long);
 937         static char clearedbuf[MAXBSIZE];
 938         char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
 939         char junk[TP_BSIZE];
 940
 941         curblk = 0;
 942         size = spcl.c_size;
 943         attrsize = spcl.c_extsize;
 944         if (spcl.c_type == TS_END)
 945                 panic("ran off end of tape\n");
 946         if (spcl.c_magic != FS_UFS2_MAGIC)
 947                 panic("not at beginning of a file\n");
 948         if (!gettingfile && setjmp(restart) != 0)
 949                 return;
 950         gettingfile++;
 951         fillit = datafill;
 952         if (size == 0 && attrsize > 0) {
 953                 fillit = attrfill;
 954                 size = attrsize;
 955                 attrsize = 0;
 956         }
 957 loop:
 958         for (i = 0; i < spcl.c_count; i++) {
 959                 if (!readmapflag && i > TP_NINDIR) {
 960                         if (Dflag) {
 961                                 fprintf(stderr, "spcl.c_count = %jd\n",
 962                                     (intmax_t)spcl.c_count);
 963                                 break;
 964                         } else
 965                                 panic("spcl.c_count = %jd\n",
 966                                     (intmax_t)spcl.c_count);
 967                 }
 968                 if (readmapflag || spcl.c_addr[i]) {
 969                         readtape(&buf[curblk++][0]);
 970                         if (curblk == fssize / TP_BSIZE) {
 971                                 (*fillit)((char *)buf, (long)(size > TP_BSIZE ?
 972                                      fssize : (curblk - 1) * TP_BSIZE + size));
 973                                 curblk = 0;
 974                         }
 975                 } else {
 976                         if (curblk > 0) {
 977                                 (*fillit)((char *)buf, (long)(size > TP_BSIZE ?
 978                                      curblk * TP_BSIZE :
 979                                      (curblk - 1) * TP_BSIZE + size));
 980                                 curblk = 0;
 981                         }
 982                         (*skip)(clearedbuf, (long)(size > TP_BSIZE ?
 983                                 TP_BSIZE : size));
 984                 }
 985                 if ((size -= TP_BSIZE) <= 0) {
 986                         if (size > -TP_BSIZE && curblk > 0) {
 987                                 (*fillit)((char *)buf,
 988                                         (long)((curblk * TP_BSIZE) + size));
 989                                 curblk = 0;
 990                         }
 991                         if (attrsize > 0) {
 992                                 fillit = attrfill;
 993                                 size = attrsize;
 994                                 attrsize = 0;
 995                                 continue;
 996                         }
 997                         if (spcl.c_count - i > 1)
 998                                 dprintf(stdout, "skipping %d junk block(s)\n",
 999                                         spcl.c_count - i - 1);
1000                         for (i++; i < spcl.c_count; i++) {
1001                                 if (!readmapflag && i > TP_NINDIR) {
1002                                         if (Dflag) {
1003                                                 fprintf(stderr,
1004                                                     "spcl.c_count = %jd\n",
1005                                                     (intmax_t)spcl.c_count);
1006                                                 break;
1007                                         } else
1008                                                 panic("spcl.c_count = %jd\n",
1009                                                     (intmax_t)spcl.c_count);
1010                                 }
1011                                 if (readmapflag || spcl.c_addr[i])
1012                                         readtape(junk);
1013                         }
1014                         break;
1015                 }
1016         }
1017         if (gethead(&spcl) == GOOD && size > 0) {
1018                 if (spcl.c_type == TS_ADDR)
1019                         goto loop;
1020                 dprintf(stdout,
1021                         "Missing address (header) block for %s at %ld blocks\n",
1022                         curfile.name, blksread);
1023         }
1024         if (curblk > 0)
1025                 panic("getfile: lost data\n");
1026         findinode(&spcl);
1027         gettingfile = 0;
1028 }
1029
1030 /*
1031  * These variables are shared between the next two functions.
1032  */
1033 static int extbufsize = 0;
1034 static char *extbuf;
1035 static int extloc;
1036
1037 /*
1038  * Allocate a buffer into which to extract extended attributes.
1039  */
1040 static char *
1041 setupextattr(int extsize)
1042 {
1043
1044         extloc = 0;
1045         if (extsize <= extbufsize)
1046                 return (extbuf);
1047         if (extbufsize > 0)
1048                 free(extbuf);
1049         if ((extbuf = malloc(extsize)) != NULL) {
1050                 extbufsize = extsize;
1051                 return (extbuf);
1052         }
1053         extbufsize = 0;
1054         extbuf = NULL;
1055         fprintf(stderr, "Cannot extract %d bytes %s for inode %d, name %s\n",
1056             extsize, "of extended attributes", curfile.ino, curfile.name);
1057         return (NULL);
1058 }
1059
1060 /*
1061  * Extract the next block of extended attributes.
1062  */
1063 static void
1064 xtrattr(char *buf, long size)
1065 {
1066
1067         if (extloc + size > extbufsize)
1068                 panic("overrun attribute buffer\n");
1069         memmove(&extbuf[extloc], buf, size);
1070         extloc += size;
1071 }
1072
1073 /*
1074  * Write out the next block of a file.
1075  */
1076 static void
1077 xtrfile(char *buf, long size)
1078 {
1079
1080         if (Nflag)
1081                 return;
1082         if (write(ofile, buf, (int) size) == -1) {
1083                 fprintf(stderr,
1084                     "write error extracting inode %d, name %s\nwrite: %s\n",
1085                         curfile.ino, curfile.name, strerror(errno));
1086         }
1087 }
1088
1089 /*
1090  * Skip over a hole in a file.
1091  */
1092 /* ARGSUSED */
1093 static void
1094 xtrskip(char *buf, long size)
1095 {
1096
1097         if (lseek(ofile, size, SEEK_CUR) == -1) {
1098                 fprintf(stderr,
1099                     "seek error extracting inode %d, name %s\nlseek: %s\n",
1100                         curfile.ino, curfile.name, strerror(errno));
1101                 done(1);
1102         }
1103 }
1104
1105 /*
1106  * Collect the next block of a symbolic link.
1107  */
1108 static void
1109 xtrlnkfile(char *buf, long size)
1110 {
1111
1112         pathlen += size;
1113         if (pathlen > MAXPATHLEN) {
1114                 fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n",
1115                     curfile.name, lnkbuf, buf, pathlen);
1116                 done(1);
1117         }
1118         (void) strcat(lnkbuf, buf);
1119 }
1120
1121 /*
1122  * Skip over a hole in a symbolic link (should never happen).
1123  */
1124 /* ARGSUSED */
1125 static void
1126 xtrlnkskip(char *buf, long size)
1127 {
1128
1129         fprintf(stderr, "unallocated block in symbolic link %s\n",
1130                 curfile.name);
1131         done(1);
1132 }
1133
1134 /*
1135  * Collect the next block of a bit map.
1136  */
1137 static void
1138 xtrmap(char *buf, long size)
1139 {
1140
1141         memmove(map, buf, size);
1142         map += size;
1143 }
1144
1145 /*
1146  * Skip over a hole in a bit map (should never happen).
1147  */
1148 /* ARGSUSED */
1149 static void
1150 xtrmapskip(char *buf, long size)
1151 {
1152
1153         panic("hole in map\n");
1154         map += size;
1155 }
1156
1157 /*
1158  * Noop, when an extraction function is not needed.
1159  */
1160 /* ARGSUSED */
1161 void
1162 xtrnull(char *buf, long size)
1163 {
1164
1165         return;
1166 }
1167
1168 /*
1169  * Read TP_BSIZE blocks from the input.
1170  * Handle read errors, and end of media.
1171  */
1172 static void
1173 readtape(char *buf)
1174 {
1175         long rd, newvol, i, oldnumtrec;
1176         int cnt, seek_failed;
1177
1178         if (blkcnt + (byteslide > 0) < numtrec) {
1179                 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE) + byteslide], (long)TP_BSIZE);
1180                 blksread++;
1181                 tapeaddr++;
1182                 return;
1183         }
1184         if (numtrec > 0)
1185                 memmove(&tapebuf[-TP_BSIZE],
1186                     &tapebuf[(numtrec-1) * TP_BSIZE], (long)TP_BSIZE);
1187         oldnumtrec = numtrec;
1188         for (i = 0; i < ntrec; i++)
1189                 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
1190         if (numtrec == 0)
1191                 numtrec = ntrec;
1192         cnt = ntrec * TP_BSIZE;
1193         rd = 0;
1194 getmore:
1195 #ifdef RRESTORE
1196         if (host)
1197                 i = rmtread(&tapebuf[rd], cnt);
1198         else
1199 #endif
1200                 i = read(mt, &tapebuf[rd], cnt);
1201         /*
1202          * Check for mid-tape short read error.
1203          * If found, skip rest of buffer and start with the next.
1204          */
1205         if (!pipein && numtrec < ntrec && i > 0) {
1206                 dprintf(stdout, "mid-media short read error.\n");
1207                 numtrec = ntrec;
1208         }
1209         /*
1210          * Handle partial block read.
1211          */
1212         if (pipein && i == 0 && rd > 0)
1213                 i = rd;
1214         else if (i > 0 && i != ntrec * TP_BSIZE) {
1215                 if (pipein) {
1216                         rd += i;
1217                         cnt -= i;
1218                         if (cnt > 0)
1219                                 goto getmore;
1220                         i = rd;
1221                 } else {
1222                         /*
1223                          * Short read. Process the blocks read.
1224                          */
1225                         if (i % TP_BSIZE != 0)
1226                                 vprintf(stdout,
1227                                     "partial block read: %ld should be %ld\n",
1228                                     i, ntrec * TP_BSIZE);
1229                         numtrec = i / TP_BSIZE;
1230                 }
1231         }
1232         /*
1233          * Handle read error.
1234          */
1235         if (i < 0) {
1236                 fprintf(stderr, "Tape read error while ");
1237                 switch (curfile.action) {
1238                 default:
1239                         fprintf(stderr, "trying to set up tape\n");
1240                         break;
1241                 case UNKNOWN:
1242                         fprintf(stderr, "trying to resynchronize\n");
1243                         break;
1244                 case USING:
1245                         fprintf(stderr, "restoring %s\n", curfile.name);
1246                         break;
1247                 case SKIP:
1248                         fprintf(stderr, "skipping over inode %d\n",
1249                                 curfile.ino);
1250                         break;
1251                 }
1252                 if (!yflag && !reply("continue"))
1253                         done(1);
1254                 i = ntrec * TP_BSIZE;
1255                 memset(tapebuf, 0, i);
1256 #ifdef RRESTORE
1257                 if (host)
1258                         seek_failed = (rmtseek(i, 1) < 0);
1259                 else
1260 #endif
1261                         seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1);
1262
1263                 if (seek_failed) {
1264                         fprintf(stderr,
1265                             "continuation failed: %s\n", strerror(errno));
1266                         done(1);
1267                 }
1268         }
1269         /*
1270          * Handle end of tape.
1271          */
1272         if (i == 0) {
1273                 vprintf(stdout, "End-of-tape encountered\n");
1274                 if (!pipein) {
1275                         newvol = volno + 1;
1276                         volno = 0;
1277                         numtrec = 0;
1278                         getvol(newvol);
1279                         readtape(buf);
1280                         return;
1281                 }
1282                 if (rd % TP_BSIZE != 0)
1283                         panic("partial block read: %d should be %d\n",
1284                                 rd, ntrec * TP_BSIZE);
1285                 terminateinput();
1286                 memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE);
1287         }
1288         if (oldnumtrec == 0)
1289                 blkcnt = 0;
1290         else
1291                 blkcnt -= oldnumtrec;
1292         memmove(buf,
1293             &tapebuf[(blkcnt++ * TP_BSIZE) + byteslide], (long)TP_BSIZE);
1294         blksread++;
1295         tapeaddr++;
1296 }
1297
1298 static void
1299 findtapeblksize(void)
1300 {
1301         long i;
1302
1303         for (i = 0; i < ntrec; i++)
1304                 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
1305         blkcnt = 0;
1306 #ifdef RRESTORE
1307         if (host)
1308                 i = rmtread(tapebuf, ntrec * TP_BSIZE);
1309         else
1310 #endif
1311                 i = read(mt, tapebuf, ntrec * TP_BSIZE);
1312
1313         if (i <= 0) {
1314                 fprintf(stderr, "tape read error: %s\n", strerror(errno));
1315                 done(1);
1316         }
1317         if (i % TP_BSIZE != 0) {
1318                 fprintf(stderr, "Tape block size (%ld) %s (%d)\n",
1319                         i, "is not a multiple of dump block size", TP_BSIZE);
1320                 done(1);
1321         }
1322         ntrec = i / TP_BSIZE;
1323         numtrec = ntrec;
1324         vprintf(stdout, "Tape block size is %ld\n", ntrec);
1325 }
1326
1327 void
1328 closemt(void)
1329 {
1330
1331         if (mt < 0)
1332                 return;
1333         if (pipecmdin) {
1334                 pclose(popenfp);
1335                 popenfp = NULL;
1336         } else
1337 #ifdef RRESTORE
1338         if (host)
1339                 rmtclose();
1340         else
1341 #endif
1342                 (void) close(mt);
1343 }
1344
1345 /*
1346  * Read the next block from the tape.
1347  * If it is not any valid header, return an error.
1348  */
1349 static int
1350 gethead(struct s_spcl *buf)
1351 {
1352         long i;
1353
1354         readtape((char *)buf);
1355         if (buf->c_magic != FS_UFS2_MAGIC && buf->c_magic != NFS_MAGIC) {
1356                 if (buf->c_magic == OFS_MAGIC) {
1357                         fprintf(stderr,
1358                             "Format of dump tape is too old. Must use\n");
1359                         fprintf(stderr,
1360                             "a version of restore from before 2002.\n");
1361                         return (FAIL);
1362                 }
1363                 if (swabl(buf->c_magic) != FS_UFS2_MAGIC &&
1364                     buf->c_magic != NFS_MAGIC) {
1365                         if (buf->c_magic == OFS_MAGIC) {
1366                                 fprintf(stderr,
1367                                   "Format of dump tape is too old. Must use\n");
1368                                 fprintf(stderr,
1369                                   "a version of restore from before 2002.\n");
1370                         }
1371                         return (FAIL);
1372                 }
1373                 if (!Bcvt) {
1374                         vprintf(stdout, "Note: Doing Byte swapping\n");
1375                         Bcvt = 1;
1376                 }
1377         }
1378         if (checksum((int *)buf) == FAIL)
1379                 return (FAIL);
1380         if (_time64_to_time(buf->c_date) != dumpdate)
1381                 fprintf(stderr, "Header with wrong dumpdate.\n");
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_inumber = 0;
1397                 buf->c_size = buf->c_count * TP_BSIZE;
1398                 if (buf->c_count > TP_NINDIR)
1399                         readmapflag = 1;
1400                 else
1401                         for (i = 0; i < buf->c_count; i++)
1402                                 buf->c_addr[i]++;
1403                 break;
1404
1405         case TS_TAPE:
1406                 if (buf->c_magic == NFS_MAGIC) {
1407                         if ((buf->c_flags & NFS_DR_NEWINODEFMT) == 0)
1408                                 oldinofmt = 1;
1409                         buf->c_date = _time32_to_time(buf->c_old_date);
1410                         buf->c_ddate = _time32_to_time(buf->c_old_ddate);
1411                         buf->c_tapea = buf->c_old_tapea;
1412                         buf->c_firstrec = buf->c_old_firstrec;
1413                 }
1414         case TS_END:
1415                 buf->c_inumber = 0;
1416                 break;
1417
1418         case TS_INODE:
1419                 /*
1420                  * For old dump tapes, have to copy up old fields to
1421                  * new locations.
1422                  */
1423                 if (buf->c_magic == NFS_MAGIC) {
1424                         buf->c_tapea = buf->c_old_tapea;
1425                         buf->c_firstrec = buf->c_old_firstrec;
1426                         buf->c_date = _time32_to_time(buf->c_old_date);
1427                         buf->c_ddate = _time32_to_time(buf->c_old_ddate);
1428                         buf->c_atime = _time32_to_time(buf->c_old_atime);
1429                         buf->c_mtime = _time32_to_time(buf->c_old_mtime);
1430                 }
1431                 break;
1432
1433         case TS_ADDR:
1434                 break;
1435
1436         default:
1437                 panic("gethead: unknown inode type %d\n", buf->c_type);
1438                 break;
1439         }
1440         /*
1441          * If we're restoring a filesystem with the old (FreeBSD 1)
1442          * format inodes, copy the uid/gid to the new location
1443          */
1444         if (oldinofmt) {
1445                 buf->c_uid = buf->c_spare1[1];
1446                 buf->c_gid = buf->c_spare1[2];
1447         }
1448         buf->c_magic = FS_UFS2_MAGIC;
1449         tapeaddr = buf->c_tapea;
1450         if (dflag)
1451                 accthdr(buf);
1452         return(GOOD);
1453 }
1454
1455 /*
1456  * Check that a header is where it belongs and predict the next header
1457  */
1458 static void
1459 accthdr(struct s_spcl *header)
1460 {
1461         static ino_t previno = 0x7fffffff;
1462         static int prevtype;
1463         static long predict;
1464         long blks, i;
1465
1466         if (header->c_type == TS_TAPE) {
1467                 fprintf(stderr, "Volume header ");
1468                 if (header->c_firstrec)
1469                         fprintf(stderr, "begins with record %qd",
1470                                 header->c_firstrec);
1471                 fprintf(stderr, "\n");
1472                 previno = 0x7fffffff;
1473                 return;
1474         }
1475         if (previno == 0x7fffffff)
1476                 goto newcalc;
1477         switch (prevtype) {
1478         case TS_BITS:
1479                 fprintf(stderr, "Dumped inodes map header");
1480                 break;
1481         case TS_CLRI:
1482                 fprintf(stderr, "Used inodes map header");
1483                 break;
1484         case TS_INODE:
1485                 fprintf(stderr, "File header, ino %d", previno);
1486                 break;
1487         case TS_ADDR:
1488                 fprintf(stderr, "File continuation header, ino %d", previno);
1489                 break;
1490         case TS_END:
1491                 fprintf(stderr, "End of tape header");
1492                 break;
1493         }
1494         if (predict != blksread - 1)
1495                 fprintf(stderr, "; predicted %ld blocks, got %ld blocks",
1496                         predict, blksread - 1);
1497         fprintf(stderr, "\n");
1498 newcalc:
1499         blks = 0;
1500         if (header->c_type != TS_END)
1501                 for (i = 0; i < header->c_count; i++)
1502                         if (readmapflag || header->c_addr[i] != 0)
1503                                 blks++;
1504         predict = blks;
1505         blksread = 0;
1506         prevtype = header->c_type;
1507         previno = header->c_inumber;
1508 }
1509
1510 /*
1511  * Find an inode header.
1512  * Complain if had to skip.
1513  */
1514 static void
1515 findinode(struct s_spcl *header)
1516 {
1517         static long skipcnt = 0;
1518         long i;
1519         char buf[TP_BSIZE];
1520         int htype;
1521
1522         curfile.name = "<name unknown>";
1523         curfile.action = UNKNOWN;
1524         curfile.mode = 0;
1525         curfile.ino = 0;
1526         do {
1527                 htype = header->c_type;
1528                 switch (htype) {
1529
1530                 case TS_ADDR:
1531                         /*
1532                          * Skip up to the beginning of the next record
1533                          */
1534                         for (i = 0; i < header->c_count; i++)
1535                                 if (header->c_addr[i])
1536                                         readtape(buf);
1537                         while (gethead(header) == FAIL ||
1538                             _time64_to_time(header->c_date) != dumpdate) {
1539                                 skipcnt++;
1540                                 if (Dflag) {
1541                                         byteslide++;
1542                                         if (byteslide < TP_BSIZE) {
1543                                                 blkcnt--;
1544                                                 blksread--;
1545                                         } else
1546                                                 byteslide = 0;
1547                                 }
1548                         }
1549                         break;
1550
1551                 case TS_INODE:
1552                         curfile.mode = header->c_mode;
1553                         curfile.uid = header->c_uid;
1554                         curfile.gid = header->c_gid;
1555                         curfile.file_flags = header->c_file_flags;
1556                         curfile.rdev = header->c_rdev;
1557                         curfile.atime_sec = header->c_atime;
1558                         curfile.atime_nsec = header->c_atimensec;
1559                         curfile.mtime_sec = header->c_mtime;
1560                         curfile.mtime_nsec = header->c_mtimensec;
1561                         curfile.birthtime_sec = header->c_birthtime;
1562                         curfile.birthtime_nsec = header->c_birthtimensec;
1563                         curfile.extsize = header->c_extsize;
1564                         curfile.size = header->c_size;
1565                         curfile.ino = header->c_inumber;
1566                         break;
1567
1568                 case TS_END:
1569                         /* If we missed some tapes, get another volume. */
1570                         if (tapesread & (tapesread + 1)) {
1571                                 getvol(0);
1572                                 continue;
1573                         }
1574                         curfile.ino = maxino;
1575                         break;
1576
1577                 case TS_CLRI:
1578                         curfile.name = "<file removal list>";
1579                         break;
1580
1581                 case TS_BITS:
1582                         curfile.name = "<file dump list>";
1583                         break;
1584
1585                 case TS_TAPE:
1586                         if (Dflag)
1587                                 fprintf(stderr, "unexpected tape header\n");
1588                         else
1589                                 panic("unexpected tape header\n");
1590
1591                 default:
1592                         if (Dflag)
1593                                 fprintf(stderr, "unknown tape header type %d\n",
1594                                     spcl.c_type);
1595                         else
1596                                 panic("unknown tape header type %d\n",
1597                                     spcl.c_type);
1598                         while (gethead(header) == FAIL ||
1599                             _time64_to_time(header->c_date) != dumpdate) {
1600                                 skipcnt++;
1601                                 if (Dflag) {
1602                                         byteslide++;
1603                                         if (byteslide < TP_BSIZE) {
1604                                                 blkcnt--;
1605                                                 blksread--;
1606                                         } else
1607                                                 byteslide = 0;
1608                                 }
1609                         }
1610
1611                 }
1612         } while (htype == TS_ADDR);
1613         if (skipcnt > 0)
1614                 fprintf(stderr, "resync restore, skipped %ld %s\n",
1615                     skipcnt, Dflag ? "bytes" : "blocks");
1616         skipcnt = 0;
1617 }
1618
1619 static int
1620 checksum(int *buf)
1621 {
1622         int i, j;
1623
1624         j = sizeof(union u_spcl) / sizeof(int);
1625         i = 0;
1626         if (!Bcvt) {
1627                 do
1628                         i += *buf++;
1629                 while (--j);
1630         } else {
1631                 /* What happens if we want to read restore tapes
1632                         for a 16bit int machine??? */
1633                 do
1634                         i += swabl(*buf++);
1635                 while (--j);
1636         }
1637
1638         if (i != CHECKSUM) {
1639                 fprintf(stderr, "Checksum error %o, inode %d file %s\n", i,
1640                         curfile.ino, curfile.name);
1641                 return(FAIL);
1642         }
1643         return(GOOD);
1644 }
1645
1646 #ifdef RRESTORE
1647 #include <stdarg.h>
1648
1649 void
1650 msg(const char *fmt, ...)
1651 {
1652         va_list ap;
1653         va_start(ap, fmt);
1654         (void)vfprintf(stderr, fmt, ap);
1655         va_end(ap);
1656 }
1657 #endif /* RRESTORE */
1658
1659 static u_char *
1660 swabshort(u_char *sp, int n)
1661 {
1662         char c;
1663
1664         while (--n >= 0) {
1665                 c = sp[0]; sp[0] = sp[1]; sp[1] = c;
1666                 sp += 2;
1667         }
1668         return (sp);
1669 }
1670
1671 static u_char *
1672 swablong(u_char *sp, int n)
1673 {
1674         char c;
1675
1676         while (--n >= 0) {
1677                 c = sp[0]; sp[0] = sp[3]; sp[3] = c;
1678                 c = sp[2]; sp[2] = sp[1]; sp[1] = c;
1679                 sp += 4;
1680         }
1681         return (sp);
1682 }
1683
1684 static u_char *
1685 swabquad(u_char *sp, int n)
1686 {
1687         char c;
1688
1689         while (--n >= 0) {
1690                 c = sp[0]; sp[0] = sp[7]; sp[7] = c;
1691                 c = sp[1]; sp[1] = sp[6]; sp[6] = c;
1692                 c = sp[2]; sp[2] = sp[5]; sp[5] = c;
1693                 c = sp[3]; sp[3] = sp[4]; sp[4] = c;
1694                 sp += 8;
1695         }
1696         return (sp);
1697 }
1698
1699 void
1700 swabst(u_char *cp, u_char *sp)
1701 {
1702         int n = 0;
1703
1704         while (*cp) {
1705                 switch (*cp) {
1706                 case '0': case '1': case '2': case '3': case '4':
1707                 case '5': case '6': case '7': case '8': case '9':
1708                         n = (n * 10) + (*cp++ - '0');
1709                         continue;
1710
1711                 case 's': case 'w': case 'h':
1712                         if (n == 0)
1713                                 n = 1;
1714                         sp = swabshort(sp, n);
1715                         break;
1716
1717                 case 'l':
1718                         if (n == 0)
1719                                 n = 1;
1720                         sp = swablong(sp, n);
1721                         break;
1722
1723                 case 'q':
1724                         if (n == 0)
1725                                 n = 1;
1726                         sp = swabquad(sp, n);
1727                         break;
1728
1729                 case 'b':
1730                         if (n == 0)
1731                                 n = 1;
1732                         sp += n;
1733                         break;
1734
1735                 default:
1736                         fprintf(stderr, "Unknown conversion character: %c\n",
1737                             *cp);
1738                         done(0);
1739                         break;
1740                 }
1741                 cp++;
1742                 n = 0;
1743         }
1744 }
1745
1746 static u_long
1747 swabl(u_long x)
1748 {
1749         swabst((u_char *)"l", (u_char *)&x);
1750         return (x);
1751 }