restore/tape.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <pop@cybercable.fr>, 1999-2000
   6  */
   7
   8 /*
   9  * Copyright (c) 1983, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  * (c) UNIX System Laboratories, Inc.
  12  * All or some portions of this file are derived from material licensed
  13  * to the University of California by American Telephone and Telegraph
  14  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  15  * the permission of UNIX System Laboratories, Inc.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions
  19  * are met:
  20  * 1. Redistributions of source code must retain the above copyright
  21  *    notice, this list of conditions and the following disclaimer.
  22  * 2. Redistributions in binary form must reproduce the above copyright
  23  *    notice, this list of conditions and the following disclaimer in the
  24  *    documentation and/or other materials provided with the distribution.
  25  * 3. All advertising materials mentioning features or use of this software
  26  *    must display the following acknowledgement:
  27  *      This product includes software developed by the University of
  28  *      California, Berkeley and its contributors.
  29  * 4. Neither the name of the University nor the names of its contributors
  30  *    may be used to endorse or promote products derived from this software
  31  *    without specific prior written permission.
  32  *
  33  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  43  * SUCH DAMAGE.
  44  */
  45
  46 #ifndef lint
  47 static const char rcsid[] =
  48         "$Id: tape.c,v 1.14 2000/03/03 11:00:55 stelian Exp $";
  49 #endif /* not lint */
  50
  51 #include <sys/param.h>
  52 #include <sys/file.h>
  53 #include <sys/mtio.h>
  54 #include <sys/stat.h>
  55
  56 #ifdef  __linux__
  57 #include <sys/time.h>
  58 #include <linux/ext2_fs.h>
  59 #include <bsdcompat.h>
  60 #else   /* __linux__ */
  61 #include <ufs/ufs/dinode.h>
  62 #endif  /* __linux__ */
  63 #include <protocols/dumprestore.h>
  64
  65 #include <errno.h>
  66 #include <compaterr.h>
  67 #include <setjmp.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <unistd.h>
  72
  73 #ifdef  __linux__
  74 #include <ext2fs/ext2fs.h>
  75 #endif
  76
  77 #include "restore.h"
  78 #include "extern.h"
  79 #include "pathnames.h"
  80
  81 static long     fssize = MAXBSIZE;
  82 static int      mt = -1;
  83 static int      pipein = 0;
  84 static char     magtape[MAXPATHLEN];
  85 static char     magtapeprefix[MAXPATHLEN];
  86 static int      blkcnt;
  87 static int      numtrec;
  88 static char     *tapebuf;
  89 static union    u_spcl endoftapemark;
  90 static long     blksread;               /* blocks read since last header */
  91 static long     tpblksread = 0;         /* TP_BSIZE blocks read */
  92 static long     tapesread;
  93 static sigjmp_buf       restart;
  94 static int      gettingfile = 0;        /* restart has a valid frame */
  95 static char     *host = NULL;
  96
  97 static int      ofile;
  98 static char     *map;
  99 static char     lnkbuf[MAXPATHLEN + 1];
 100 static int      pathlen;
 101
 102 int             oldinofmt;      /* old inode format conversion required */
 103 int             Bcvt;           /* Swap Bytes (for CCI or sun) */
 104 static int      Qcvt;           /* Swap quads (for sun) */
 105
 106 #define FLUSHTAPEBUF()  blkcnt = ntrec + 1
 107
 108 static void      accthdr __P((struct s_spcl *));
 109 static int       checksum __P((int *));
 110 static void      findinode __P((struct s_spcl *));
 111 static void      findtapeblksize __P((void));
 112 static int       gethead __P((struct s_spcl *));
 113 static void      readtape __P((char *));
 114 static void      setdumpnum __P((void));
 115 static u_int     swabi __P((u_int));
 116 static u_long    swabl __P((u_long));
 117 static u_char   *swab64 __P((u_char *, int));
 118 static u_char   *swab32 __P((u_char *, int));
 119 static u_char   *swab16 __P((u_char *, int));
 120 static void      terminateinput __P((void));
 121 static void      xtrfile __P((char *, size_t));
 122 static void      xtrlnkfile __P((char *, size_t));
 123 static void      xtrlnkskip __P((char *, size_t));
 124 static void      xtrmap __P((char *, size_t));
 125 static void      xtrmapskip __P((char *, size_t));
 126 static void      xtrskip __P((char *, size_t));
 127
 128 static int readmapflag;
 129
 130 /*
 131  * Set up an input source
 132  */
 133 void
 134 setinput(char *source)
 135 {
 136         FLUSHTAPEBUF();
 137         if (bflag)
 138                 newtapebuf(ntrec);
 139         else
 140                 newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC);
 141         terminal = stdin;
 142
 143 #ifdef RRESTORE
 144         if (strchr(source, ':')) {
 145                 host = source;
 146                 source = strchr(host, ':');
 147                 *source++ = '\0';
 148                 if (rmthost(host) == 0)
 149                         exit(1);
 150         } else
 151 #endif
 152         if (strcmp(source, "-") == 0) {
 153                 /*
 154                  * Since input is coming from a pipe we must establish
 155                  * our own connection to the terminal.
 156                  */
 157                 terminal = fopen(_PATH_TTY, "r");
 158                 if (terminal == NULL) {
 159                         warn("cannot open %s", _PATH_TTY);
 160                         terminal = fopen(_PATH_DEVNULL, "r");
 161                         if (terminal == NULL)
 162                                 err(1, "cannot open %s", _PATH_DEVNULL);
 163                 }
 164                 pipein++;
 165         }
 166         setuid(getuid());       /* no longer need or want root privileges */
 167         if (Mflag) {
 168                 strncpy(magtapeprefix, source, MAXPATHLEN);
 169                 magtapeprefix[MAXPATHLEN-1] = '\0';
 170                 snprintf(magtape, MAXPATHLEN, "%s%03d", source, 1);
 171         }
 172         else
 173                 strncpy(magtape, source, MAXPATHLEN);
 174         magtape[MAXPATHLEN - 1] = '\0';
 175 }
 176
 177 void
 178 newtapebuf(long size)
 179 {
 180         static int tapebufsize = -1;
 181
 182         ntrec = size;
 183         if (size <= tapebufsize)
 184                 return;
 185         if (tapebuf != NULL)
 186                 free(tapebuf);
 187         tapebuf = malloc(size * TP_BSIZE);
 188         if (tapebuf == NULL)
 189                 errx(1, "Cannot allocate space for tape buffer");
 190         tapebufsize = size;
 191 }
 192
 193 /*
 194  * Verify that the tape drive can be accessed and
 195  * that it actually is a dump tape.
 196  */
 197 void
 198 setup(void)
 199 {
 200         int i, j, *ip;
 201         struct stat stbuf;
 202
 203         Vprintf(stdout, "Verify tape and initialize maps\n");
 204 #ifdef RRESTORE
 205         if (host)
 206                 mt = rmtopen(magtape, 0);
 207         else
 208 #endif
 209         if (pipein)
 210                 mt = 0;
 211         else
 212                 mt = open(magtape, O_RDONLY, 0);
 213         if (mt < 0)
 214                 err(1, "%s", magtape);
 215         volno = 1;
 216         setdumpnum();
 217         FLUSHTAPEBUF();
 218         if (!pipein && !bflag)
 219                 findtapeblksize();
 220         if (gethead(&spcl) == FAIL) {
 221                 blkcnt--; /* push back this block */
 222                 blksread--;
 223                 tpblksread--;
 224                 cvtflag++;
 225                 if (gethead(&spcl) == FAIL)
 226                         errx(1, "Tape is not a dump tape");
 227                 fprintf(stderr, "Converting to new file system format.\n");
 228         }
 229         if (pipein) {
 230                 endoftapemark.s_spcl.c_magic = cvtflag ? OFS_MAGIC : NFS_MAGIC;
 231                 endoftapemark.s_spcl.c_type = TS_END;
 232                 ip = (int *)&endoftapemark;
 233                 j = sizeof(union u_spcl) / sizeof(int);
 234                 i = 0;
 235                 do
 236                         i += *ip++;
 237                 while (--j);
 238                 endoftapemark.s_spcl.c_checksum = CHECKSUM - i;
 239         }
 240         if (vflag || command == 't' || command == 'C')
 241                 printdumpinfo();
 242         if (filesys[0] == '\0') {
 243                 char *dirptr;
 244                 strncpy(filesys, spcl.c_filesys, NAMELEN);
 245                 filesys[NAMELEN - 1] = '\0';
 246                 dirptr = strstr(filesys, " (dir");
 247                 if (dirptr != NULL)
 248                         *dirptr = '\0';
 249         }
 250         dumptime = spcl.c_ddate;
 251         dumpdate = spcl.c_date;
 252         if (stat(".", &stbuf) < 0)
 253                 err(1, "cannot stat .");
 254         if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE )
 255                 fssize = TP_BSIZE;
 256         if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE)
 257                 fssize = stbuf.st_blksize;
 258         if (((fssize - 1) & fssize) != 0)
 259                 errx(1, "bad block size %ld", fssize);
 260         if (spcl.c_volume != 1)
 261                 errx(1, "Tape is not volume 1 of the dump");
 262         if (gethead(&spcl) == FAIL) {
 263                 Dprintf(stdout, "header read failed at %ld blocks\n", (long)blksread);
 264                 panic("no header after volume mark!\n");
 265         }
 266         findinode(&spcl);
 267         if (spcl.c_type != TS_CLRI)
 268                 errx(1, "Cannot find file removal list");
 269         maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
 270         Dprintf(stdout, "maxino = %ld\n", (long)maxino);
 271         map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
 272         if (map == NULL)
 273                 panic("no memory for active inode map\n");
 274         usedinomap = map;
 275         curfile.action = USING;
 276         getfile(xtrmap, xtrmapskip);
 277         if (spcl.c_type != TS_BITS)
 278                 errx(1, "Cannot find file dump list");
 279         map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
 280         if (map == (char *)NULL)
 281                 panic("no memory for file dump list\n");
 282         dumpmap = map;
 283         curfile.action = USING;
 284         getfile(xtrmap, xtrmapskip);
 285         /*
 286          * If there may be whiteout entries on the tape, pretend that the
 287          * whiteout inode exists, so that the whiteout entries can be
 288          * extracted.
 289          */
 290         if (oldinofmt == 0)
 291                 SETINO(WINO, dumpmap);
 292 }
 293
 294 /*
 295  * Prompt user to load a new dump volume.
 296  * "Nextvol" is the next suggested volume to use.
 297  * This suggested volume is enforced when doing full
 298  * or incremental restores, but can be overridden by
 299  * the user when only extracting a subset of the files.
 300  */
 301 void
 302 getvol(long nextvol)
 303 {
 304         long newvol = 0, savecnt = 0, wantnext = 0, i;
 305         union u_spcl tmpspcl;
 306 #       define tmpbuf tmpspcl.s_spcl
 307         char buf[TP_BSIZE];
 308         int haderror = 0;
 309
 310         if (nextvol == 1) {
 311                 tapesread = 0;
 312                 gettingfile = 0;
 313         }
 314         if (pipein) {
 315                 if (nextvol != 1)
 316                         panic("Changing volumes on pipe input?\n");
 317                 if (volno == 1)
 318                         return;
 319                 goto gethdr;
 320         }
 321         savecnt = blksread;
 322 again:
 323         if (pipein)
 324                 exit(1); /* pipes do not get a second chance */
 325         if (command == 'R' || command == 'r' || curfile.action != SKIP) {
 326                 newvol = nextvol;
 327                 wantnext = 1;
 328         } else {
 329                 newvol = 0;
 330                 wantnext = 0;
 331         }
 332         while (newvol <= 0) {
 333                 if (tapesread == 0) {
 334                         fprintf(stderr, "%s%s%s%s%s",
 335                             "You have not read any tapes yet.\n",
 336                             "Unless you know which volume your",
 337                             " file(s) are on you should start\n",
 338                             "with the last volume and work",
 339                             " towards the first.\n");
 340                 } else {
 341                         fprintf(stderr, "You have read volumes");
 342                         strcpy(buf, ": ");
 343                         for (i = 1; i < 32; i++)
 344                                 if (tapesread & (1 << i)) {
 345                                         fprintf(stderr, "%s%ld", buf, (long)i);
 346                                         strcpy(buf, ", ");
 347                                 }
 348                         fprintf(stderr, "\n");
 349                 }
 350                 do      {
 351                         fprintf(stderr, "Specify next volume #: ");
 352                         (void) fflush(stderr);
 353                         (void) fgets(buf, BUFSIZ, terminal);
 354                 } while (!feof(terminal) && buf[0] == '\n');
 355                 if (feof(terminal))
 356                         exit(1);
 357                 newvol = atoi(buf);
 358                 if (newvol <= 0) {
 359                         fprintf(stderr,
 360                             "Volume numbers are positive numerics\n");
 361                 }
 362         }
 363         if (newvol == volno) {
 364                 tapesread |= 1 << volno;
 365                 return;
 366         }
 367         closemt();
 368         if (Mflag) {
 369                 snprintf(magtape, MAXPATHLEN, "%s%03ld", magtapeprefix, newvol);
 370                 magtape[MAXPATHLEN - 1] = '\0';
 371         }
 372         if (!Mflag || haderror) {
 373                 haderror = 0;
 374                 fprintf(stderr, "Mount tape volume %ld\n", (long)newvol);
 375                 fprintf(stderr, "Enter ``none'' if there are no more tapes\n");
 376                 fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape);
 377                 (void) fflush(stderr);
 378                 (void) fgets(buf, BUFSIZ, terminal);
 379                 if (feof(terminal))
 380                         exit(1);
 381                 if (!strcmp(buf, "none\n")) {
 382                         terminateinput();
 383                         return;
 384                 }
 385                 if (buf[0] != '\n') {
 386                         (void) strcpy(magtape, buf);
 387                         magtape[strlen(magtape) - 1] = '\0';
 388                 }
 389         }
 390 #ifdef RRESTORE
 391         if (host)
 392                 mt = rmtopen(magtape, 0);
 393         else
 394 #endif
 395                 mt = open(magtape, O_RDONLY, 0);
 396
 397         if (mt == -1) {
 398                 fprintf(stderr, "Cannot open %s\n", magtape);
 399                 volno = -1;
 400                 haderror = 1;
 401                 goto again;
 402         }
 403 gethdr:
 404         volno = newvol;
 405         setdumpnum();
 406         FLUSHTAPEBUF();
 407         if (gethead(&tmpbuf) == FAIL) {
 408                 Dprintf(stdout, "header read failed at %ld blocks\n", (long)blksread);
 409                 fprintf(stderr, "tape is not dump tape\n");
 410                 volno = 0;
 411                 haderror = 1;
 412                 goto again;
 413         }
 414         if (tmpbuf.c_volume != volno) {
 415                 fprintf(stderr, "Wrong volume (%d)\n", tmpbuf.c_volume);
 416                 volno = 0;
 417                 haderror = 1;
 418                 goto again;
 419         }
 420         if (tmpbuf.c_date != dumpdate || tmpbuf.c_ddate != dumptime) {
 421 #ifdef  __linux__
 422                 fprintf(stderr, "Wrong dump date\n\tgot: %s",
 423                         ctime4(&tmpbuf.c_date));
 424                 fprintf(stderr, "\twanted: %s", ctime4(&dumpdate));
 425 #else
 426                 fprintf(stderr, "Wrong dump date\n\tgot: %s",
 427                         ctime(&tmpbuf.c_date));
 428                 fprintf(stderr, "\twanted: %s", ctime(&dumpdate));
 429 #endif
 430                 volno = 0;
 431                 haderror = 1;
 432                 goto again;
 433         }
 434         tapesread |= 1 << volno;
 435         blksread = savecnt;
 436         /*
 437          * If continuing from the previous volume, skip over any
 438          * blocks read already at the end of the previous volume.
 439          *
 440          * If coming to this volume at random, skip to the beginning
 441          * of the next record.
 442          */
 443         Dprintf(stdout, "read %ld recs, tape starts with %ld\n",
 444                 tpblksread, (long)tmpbuf.c_firstrec);
 445         if (tmpbuf.c_type == TS_TAPE && (tmpbuf.c_flags & DR_NEWHEADER)) {
 446                 if (!wantnext) {
 447                         tpblksread = tmpbuf.c_firstrec;
 448                         for (i = tmpbuf.c_count; i > 0; i--)
 449                                 readtape(buf);
 450                 } else if (tmpbuf.c_firstrec > 0 &&
 451                            tmpbuf.c_firstrec < tpblksread - 1) {
 452                         /*
 453                          * -1 since we've read the volume header
 454                          */
 455                         i = tpblksread - tmpbuf.c_firstrec - 1;
 456                         Dprintf(stderr, "Skipping %ld duplicate record%s.\n",
 457                                 (long)i, i > 1 ? "s" : "");
 458                         while (--i >= 0)
 459                                 readtape(buf);
 460                 }
 461         }
 462         if (curfile.action == USING) {
 463                 if (volno == 1)
 464                         panic("active file into volume 1\n");
 465                 return;
 466         }
 467         /*
 468          * Skip up to the beginning of the next record
 469          */
 470         if (tmpbuf.c_type == TS_TAPE && (tmpbuf.c_flags & DR_NEWHEADER))
 471                 for (i = tmpbuf.c_count; i > 0; i--)
 472                         readtape(buf);
 473         (void) gethead(&spcl);
 474         findinode(&spcl);
 475         if (gettingfile) {
 476                 gettingfile = 0;
 477                 siglongjmp(restart, 1);
 478         }
 479 }
 480
 481 /*
 482  * Handle unexpected EOF.
 483  */
 484 static void
 485 terminateinput(void)
 486 {
 487
 488         if (gettingfile && curfile.action == USING) {
 489                 printf("Warning: %s %s\n",
 490                     "End-of-input encountered while extracting", curfile.name);
 491         }
 492         curfile.name = "<name unknown>";
 493         curfile.action = UNKNOWN;
 494         curfile.dip = NULL;
 495         curfile.ino = maxino;
 496         if (gettingfile) {
 497                 gettingfile = 0;
 498                 siglongjmp(restart, 1);
 499         }
 500 }
 501
 502 /*
 503  * handle multiple dumps per tape by skipping forward to the
 504  * appropriate one.
 505  */
 506 static void
 507 setdumpnum(void)
 508 {
 509         struct mtop tcom;
 510
 511         if (dumpnum == 1 || volno != 1)
 512                 return;
 513         if (pipein)
 514                 errx(1, "Cannot have multiple dumps on pipe input");
 515         tcom.mt_op = MTFSF;
 516         tcom.mt_count = dumpnum - 1;
 517 #ifdef RRESTORE
 518         if (host)
 519                 rmtioctl(MTFSF, dumpnum - 1);
 520         else
 521 #endif
 522                 if (ioctl(mt, (int)MTIOCTOP, (char *)&tcom) < 0)
 523                         warn("ioctl MTFSF");
 524 }
 525
 526 void
 527 printdumpinfo(void)
 528 {
 529 #ifdef  __linux__
 530         fprintf(stdout, "Dump   date: %s", ctime4(&spcl.c_date));
 531         fprintf(stdout, "Dumped from: %s",
 532             (spcl.c_ddate == 0) ? "the epoch\n" : ctime4(&spcl.c_ddate));
 533 #else
 534         fprintf(stdout, "Dump   date: %s", ctime(&spcl.c_date));
 535         fprintf(stdout, "Dumped from: %s",
 536             (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&spcl.c_ddate));
 537 #endif
 538         if (spcl.c_host[0] == '\0')
 539                 return;
 540         fprintf(stderr, "Level %d dump of %s on %s:%s\n",
 541                 spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev);
 542         fprintf(stderr, "Label: %s\n", spcl.c_label);
 543 }
 544
 545 int
 546 extractfile(char *name)
 547 {
 548         unsigned int flags;
 549         mode_t mode;
 550         struct timeval timep[2];
 551         struct entry *ep;
 552
 553         curfile.name = name;
 554         curfile.action = USING;
 555 #ifdef  __linux__
 556         timep[0].tv_sec = curfile.dip->di_atime.tv_sec;
 557         timep[0].tv_usec = curfile.dip->di_atime.tv_usec;
 558         timep[1].tv_sec = curfile.dip->di_mtime.tv_sec;
 559         timep[1].tv_usec = curfile.dip->di_mtime.tv_usec;
 560 #else   /* __linux__ */
 561         timep[0].tv_sec = curfile.dip->di_atime;
 562         timep[0].tv_usec = curfile.dip->di_atimensec / 1000;
 563         timep[1].tv_sec = curfile.dip->di_mtime;
 564         timep[1].tv_usec = curfile.dip->di_mtimensec / 1000;
 565 #endif  /* __linux__ */
 566         mode = curfile.dip->di_mode;
 567         flags = curfile.dip->di_flags;
 568         switch (mode & IFMT) {
 569
 570         default:
 571                 fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode);
 572                 skipfile();
 573                 return (FAIL);
 574
 575         case IFSOCK:
 576                 Vprintf(stdout, "skipped socket %s\n", name);
 577                 skipfile();
 578                 return (GOOD);
 579
 580         case IFDIR:
 581                 if (mflag) {
 582                         ep = lookupname(name);
 583                         if (ep == NULL || ep->e_flags & EXTRACT)
 584                                 panic("unextracted directory %s\n", name);
 585                         skipfile();
 586                         return (GOOD);
 587                 }
 588                 Vprintf(stdout, "extract file %s\n", name);
 589                 return (genliteraldir(name, curfile.ino));
 590
 591         case IFLNK:
 592         {
 593 #ifdef HAVE_LCHOWN
 594                 uid_t luid = curfile.dip->di_uid;
 595                 gid_t lgid = curfile.dip->di_gid;
 596 #endif
 597                 lnkbuf[0] = '\0';
 598                 pathlen = 0;
 599                 getfile(xtrlnkfile, xtrlnkskip);
 600                 if (pathlen == 0) {
 601                         Vprintf(stdout,
 602                             "%s: zero length symbolic link (ignored)\n", name);
 603                         return (GOOD);
 604                 }
 605                 if (linkit(lnkbuf, name, SYMLINK) == FAIL)
 606                         return (FAIL);
 607 #ifdef HAVE_LCHOWN
 608                 (void) lchown(name, luid, lgid);
 609 #endif
 610                 return (GOOD);
 611         }
 612
 613         case IFIFO:
 614                 Vprintf(stdout, "extract fifo %s\n", name);
 615                 if (Nflag) {
 616                         skipfile();
 617                         return (GOOD);
 618                 }
 619                 if (uflag && !Nflag)
 620                         (void)unlink(name);
 621                 if (mkfifo(name, mode) < 0) {
 622                         warn("%s: cannot create fifo", name);
 623                         skipfile();
 624                         return (FAIL);
 625                 }
 626                 (void) chown(name, curfile.dip->di_uid, curfile.dip->di_gid);
 627                 (void) chmod(name, mode);
 628                 if (flags)
 629 #ifdef  __linux__
 630                         (void) fsetflags(name, flags);
 631 #else
 632                         (void) chflags(name, flags);
 633 #endif
 634                 skipfile();
 635                 utimes(name, timep);
 636                 return (GOOD);
 637
 638         case IFCHR:
 639         case IFBLK:
 640                 Vprintf(stdout, "extract special file %s\n", name);
 641                 if (Nflag) {
 642                         skipfile();
 643                         return (GOOD);
 644                 }
 645                 if (uflag)
 646                         (void)unlink(name);
 647                 if (mknod(name, mode, (int)curfile.dip->di_rdev) < 0) {
 648                         warn("%s: cannot create special file", name);
 649                         skipfile();
 650                         return (FAIL);
 651                 }
 652                 (void) chown(name, curfile.dip->di_uid, curfile.dip->di_gid);
 653                 (void) chmod(name, mode);
 654                 if (flags)
 655 #ifdef  __linux__
 656                         {
 657                         warn("%s: fsetflags called on a special file", name);
 658                         (void) fsetflags(name, flags);
 659                         }
 660 #else
 661                         (void) chflags(name, flags);
 662 #endif
 663                 skipfile();
 664                 utimes(name, timep);
 665                 return (GOOD);
 666
 667         case IFREG:
 668                 Vprintf(stdout, "extract file %s\n", name);
 669                 if (Nflag) {
 670                         skipfile();
 671                         return (GOOD);
 672                 }
 673                 if (uflag)
 674                         (void)unlink(name);
 675                 if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC,
 676                     0666)) < 0) {
 677                         warn("%s: cannot create file", name);
 678                         skipfile();
 679                         return (FAIL);
 680                 }
 681                 (void) fchown(ofile, curfile.dip->di_uid, curfile.dip->di_gid);
 682                 (void) fchmod(ofile, mode);
 683                 if (flags)
 684 #ifdef  __linux__
 685                         (void) setflags(ofile, flags);
 686 #else
 687                         (void) fchflags(ofile, flags);
 688 #endif
 689                 getfile(xtrfile, xtrskip);
 690                 (void) close(ofile);
 691                 utimes(name, timep);
 692                 return (GOOD);
 693         }
 694         /* NOTREACHED */
 695 }
 696
 697 /*
 698  * skip over bit maps on the tape
 699  */
 700 void
 701 skipmaps(void)
 702 {
 703
 704         while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI)
 705                 skipfile();
 706 }
 707
 708 /*
 709  * skip over a file on the tape
 710  */
 711 void
 712 skipfile(void)
 713 {
 714
 715         curfile.action = SKIP;
 716         getfile(xtrnull, xtrnull);
 717 }
 718
 719 /*
 720  * Extract a file from the tape.
 721  * When an allocated block is found it is passed to the fill function;
 722  * when an unallocated block (hole) is found, a zeroed buffer is passed
 723  * to the skip function.
 724  */
 725 void
 726 getfile(void (*fill) __P((char *, size_t)), void (*skip) __P((char *, size_t)))
 727 {
 728         register int i;
 729         volatile int curblk = 0;
 730         volatile quad_t size = spcl.c_dinode.di_size;
 731         volatile int last_write_was_hole = 0;
 732         quad_t origsize = size;
 733         static char clearedbuf[MAXBSIZE];
 734         char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
 735         char junk[TP_BSIZE];
 736
 737         if (spcl.c_type == TS_END)
 738                 panic("ran off end of tape\n");
 739         if (spcl.c_magic != NFS_MAGIC)
 740                 panic("not at beginning of a file\n");
 741         if (!gettingfile && setjmp(restart) != 0)
 742                 return;
 743         gettingfile++;
 744 loop:
 745         for (i = 0; i < spcl.c_count; i++) {
 746                 if (readmapflag || spcl.c_addr[i]) {
 747                         readtape(&buf[curblk++][0]);
 748                         if (curblk == fssize / TP_BSIZE) {
 749                                 (*fill)((char *)buf, (size_t)(size > TP_BSIZE ?
 750                                      fssize : (curblk - 1) * TP_BSIZE + size));
 751                                 curblk = 0;
 752                                 last_write_was_hole = 0;
 753                         }
 754                 } else {
 755                         if (curblk > 0) {
 756                                 (*fill)((char *)buf, (size_t)(size > TP_BSIZE ?
 757                                      curblk * TP_BSIZE :
 758                                      (curblk - 1) * TP_BSIZE + size));
 759                                 curblk = 0;
 760                         }
 761                         (*skip)(clearedbuf, (long)(size > TP_BSIZE ?
 762                                 TP_BSIZE : size));
 763                         last_write_was_hole = 1;
 764                 }
 765                 if ((size -= TP_BSIZE) <= 0) {
 766                         for (i++; i < spcl.c_count; i++)
 767                                 if (readmapflag || spcl.c_addr[i])
 768                                         readtape(junk);
 769                         break;
 770                 }
 771         }
 772         if (gethead(&spcl) == GOOD && size > 0) {
 773                 if (spcl.c_type == TS_ADDR)
 774                         goto loop;
 775                 Dprintf(stdout,
 776                         "Missing address (header) block for %s at %ld blocks\n",
 777                         curfile.name, (long)blksread);
 778         }
 779         if (curblk > 0) {
 780                 (*fill)((char *)buf, (size_t)(curblk * TP_BSIZE) + size);
 781                 last_write_was_hole = 0;
 782         }
 783         if (last_write_was_hole) {
 784                 ftruncate(ofile, origsize);
 785         }
 786         findinode(&spcl);
 787         gettingfile = 0;
 788 }
 789
 790 /*
 791  * Write out the next block of a file.
 792  */
 793 static void
 794 xtrfile(char *buf, size_t size)
 795 {
 796
 797         if (Nflag)
 798                 return;
 799         if (write(ofile, buf, (int) size) == -1)
 800                 err(1, "write error extracting inode %lu, name %s\nwrite",
 801                         (unsigned long)curfile.ino, curfile.name);
 802 }
 803
 804 /*
 805  * Skip over a hole in a file.
 806  */
 807 /* ARGSUSED */
 808 static void
 809 xtrskip(char *buf, size_t size)
 810 {
 811
 812         if (lseek(ofile, (off_t)size, SEEK_CUR) == -1)
 813                 err(1, "seek error extracting inode %lu, name %s\nlseek",
 814                         (unsigned long)curfile.ino, curfile.name);
 815 }
 816
 817 /*
 818  * Collect the next block of a symbolic link.
 819  */
 820 static void
 821 xtrlnkfile(char *buf, size_t size)
 822 {
 823
 824         pathlen += size;
 825         if (pathlen > MAXPATHLEN)
 826                 errx(1, "symbolic link name: %s->%s%s; too long %d",
 827                     curfile.name, lnkbuf, buf, pathlen);
 828         (void) strcat(lnkbuf, buf);
 829 }
 830
 831 /*
 832  * Skip over a hole in a symbolic link (should never happen).
 833  */
 834 /* ARGSUSED */
 835 static void
 836 xtrlnkskip(char *buf, size_t size)
 837 {
 838
 839         errx(1, "unallocated block in symbolic link %s", curfile.name);
 840 }
 841
 842 /*
 843  * Collect the next block of a bit map.
 844  */
 845 static void
 846 xtrmap(char *buf, size_t size)
 847 {
 848
 849         memmove(map, buf, size);
 850         map += size;
 851 }
 852
 853 /*
 854  * Skip over a hole in a bit map (should never happen).
 855  */
 856 /* ARGSUSED */
 857 static void
 858 xtrmapskip(char *buf, size_t size)
 859 {
 860
 861         panic("hole in map\n");
 862         map += size;
 863 }
 864
 865 /*
 866  * Noop, when an extraction function is not needed.
 867  */
 868 /* ARGSUSED */
 869 void
 870 xtrnull(char *buf, size_t size)
 871 {
 872
 873         return;
 874 }
 875
 876 static int
 877 do_cmpfiles(int fd_tape, int fd_disk, long size)
 878 {
 879         static char buf_tape[BUFSIZ];
 880         static char buf_disk[BUFSIZ];
 881         ssize_t n_tape;
 882         ssize_t n_disk;
 883
 884         while (size > 0) {
 885                 if ((n_tape = read(fd_tape, buf_tape, sizeof(buf_tape))) < 1) {
 886                         close(fd_tape), close(fd_disk);
 887                         panic("do_cmpfiles: unexpected EOF[1]");
 888                 }
 889                 if ((n_disk = read(fd_disk, buf_disk, sizeof(buf_tape))) < 1) {
 890                         close(fd_tape), close(fd_disk);
 891                         panic("do_cmpfiles: unexpected EOF[2]");
 892                 }
 893                 if (n_tape != n_disk) {
 894                         close(fd_tape), close(fd_disk);
 895                         panic("do_cmpfiles: sizes different!");
 896                 }
 897                 if (memcmp(buf_tape, buf_disk, (size_t)n_tape) != 0) return (1);
 898                 size -= n_tape;
 899         }
 900         return (0);
 901 }
 902
 903 /* for debugging compare problems */
 904 #undef COMPARE_FAIL_KEEP_FILE
 905
 906 static
 907 #ifdef COMPARE_FAIL_KEEP_FILE
 908 /* return true if tapefile should be unlinked after compare */
 909 int
 910 #else
 911 void
 912 #endif
 913 cmpfiles(char *tapefile, char *diskfile, struct stat *sbuf_disk)
 914 {
 915         struct stat sbuf_tape;
 916         int fd_tape, fd_disk;
 917
 918         if (stat(tapefile, &sbuf_tape) != 0) {
 919                 panic("Can't lstat tmp file %s: %s\n", tapefile,
 920                       strerror(errno));
 921         }
 922
 923         if (sbuf_disk->st_size != sbuf_tape.st_size) {
 924                 fprintf(stderr,
 925                         "%s: size changed from %ld to %ld.\n",
 926                         diskfile, (long)sbuf_tape.st_size, (long)sbuf_disk->st_size);
 927 #ifdef COMPARE_FAIL_KEEP_FILE
 928                 return (0);
 929 #else
 930                 return;
 931 #endif
 932         }
 933
 934         if ((fd_tape = open(tapefile, O_RDONLY)) < 0) {
 935                 panic("Can't open %s: %s\n", tapefile, strerror(errno));
 936         }
 937         if ((fd_disk = open(diskfile, O_RDONLY)) < 0) {
 938                 close(fd_tape);
 939                 panic("Can't open %s: %s\n", diskfile, strerror(errno));
 940         }
 941
 942         if (do_cmpfiles(fd_tape, fd_disk, sbuf_tape.st_size)) {
 943                 fprintf(stderr, "%s: tape and disk copies are different\n",
 944                         diskfile);
 945                 close(fd_tape);
 946                 close(fd_disk);
 947 #ifdef COMPARE_FAIL_KEEP_FILE
 948                 /* rename the file to live in /tmp */
 949                 /* rename `tapefile' to /tmp/<basename of diskfile> */
 950                 {
 951                         char *p = strrchr(diskfile, '/');
 952                         char newname[MAXPATHLEN];
 953                         if (!p) {
 954                                 panic("can't find / in %s\n", diskfile);
 955                         }
 956                         snprintf(newname, sizeof(newname), "%s/debug/%s", tmpdir, p + 1);
 957                         if (rename(tapefile, newname)) {
 958                                 panic("rename from %s to %s failed: %s\n",
 959                                       tapefile, newname,
 960                                       strerror(errno));
 961                         } else {
 962                                 fprintf(stderr, "*** %s saved to %s\n",
 963                                         tapefile, newname);
 964                         }
 965                 }
 966
 967                 /* don't unlink the file (it's not there anymore */
 968                 /* anyway) */
 969                 return (0);
 970 #else
 971                 return;
 972 #endif
 973         }
 974         close(fd_tape);
 975         close(fd_disk);
 976 #ifdef COMPARE_FAIL_KEEP_FILE
 977         return (1);
 978 #endif
 979 }
 980
 981 static char tmpfilename[MAXPATHLEN];
 982
 983 void
 984 comparefile(char *name)
 985 {
 986         static char *tmpfile = NULL;
 987         int mode;
 988         struct stat sb, stemp;
 989         int r;
 990
 991         if ((r = lstat(name, &sb)) != 0) {
 992                 warn("%s: does not exist (%d)", name, r);
 993                 skipfile();
 994                 return;
 995         }
 996
 997         curfile.name = name;
 998         curfile.action = USING;
 999         mode = curfile.dip->di_mode;
1000
1001         Vprintf(stdout, "comparing %s (size: %ld, mode: 0%o)\n", name,
1002                 (long)sb.st_size, mode);
1003
1004         if (sb.st_mode != mode) {
1005                 fprintf(stderr, "%s: mode changed from 0%o to 0%o.\n",
1006                         name, mode & 07777, sb.st_mode & 07777);
1007         }
1008         switch (mode & IFMT) {
1009         default:
1010                 skipfile();
1011                 return;
1012
1013         case IFSOCK:
1014                 skipfile();
1015                 return;
1016
1017         case IFDIR:
1018                 skipfile();
1019                 return;
1020
1021         case IFLNK: {
1022                 char lbuf[MAXPATHLEN + 1];
1023                 int lsize;
1024
1025                 if (!(sb.st_mode & S_IFLNK)) {
1026                         fprintf(stderr, "%s: is no longer a symbolic link\n",
1027                                 name);
1028                         return;
1029                 }
1030                 lnkbuf[0] = '\0';
1031                 pathlen = 0;
1032                 getfile(xtrlnkfile, xtrlnkskip);
1033                 if (pathlen == 0) {
1034                         fprintf(stderr,
1035                                 "%s: zero length symbolic link (ignored)\n",
1036                                 name);
1037                         return;
1038                 }
1039                 if ((lsize = readlink(name, lbuf, MAXPATHLEN)) < 0) {
1040                         panic("readlink of %s failed: %s", name,
1041                               strerror(errno));
1042                 }
1043                 lbuf[lsize] = 0;
1044                 if (strcmp(lbuf, lnkbuf) != 0) {
1045                         fprintf(stderr,
1046                                 "%s: symbolic link changed from %s to %s.\n",
1047                                 name, lnkbuf, lbuf);
1048                         return;
1049                 }
1050                 return;
1051         }
1052
1053         case IFCHR:
1054         case IFBLK:
1055                 if (!(sb.st_mode & (S_IFCHR|S_IFBLK))) {
1056                         fprintf(stderr, "%s: no longer a special file\n",
1057                                 name);
1058                         skipfile();
1059                         return;
1060                 }
1061
1062                 if (sb.st_rdev != (int)curfile.dip->di_rdev) {
1063                         fprintf(stderr,
1064                                 "%s: device changed from %d,%d to %d,%d.\n",
1065                                 name,
1066                                 ((int)curfile.dip->di_rdev >> 8) & 0xff,
1067                                 (int)curfile.dip->di_rdev & 0xff,
1068                                 ((int)sb.st_rdev >> 8) & 0xff,
1069                                 (int)sb.st_rdev & 0xff);
1070                 }
1071                 skipfile();
1072                 return;
1073
1074         case IFREG:
1075                 if (tmpfile == NULL) {
1076                         /* argument to mktemp() must not be in RO space: */
1077                         snprintf(tmpfilename, sizeof(tmpfilename), "%s/restoreCXXXXXX", tmpdir);
1078                         tmpfile = mktemp(&tmpfilename[0]);
1079                 }
1080                 if ((stat(tmpfile, &stemp) == 0) && (unlink(tmpfile) != 0)) {
1081                         panic("cannot delete tmp file %s: %s\n",
1082                               tmpfile, strerror(errno));
1083                 }
1084                 if ((ofile = creat(tmpfile, 0600)) < 0) {
1085                         panic("cannot create file temp file %s: %s\n",
1086                               name, strerror(errno));
1087                 }
1088                 getfile(xtrfile, xtrskip);
1089                 (void) close(ofile);
1090 #ifdef COMPARE_FAIL_KEEP_FILE
1091                 if (cmpfiles(tmpfile, name, &sb))
1092                         unlink(tmpfile);
1093 #else
1094                 cmpfiles(tmpfile, name, &sb);
1095                 unlink(tmpfile);
1096 #endif
1097                 return;
1098         }
1099         /* NOTREACHED */
1100 }
1101
1102 /*
1103  * Read TP_BSIZE blocks from the input.
1104  * Handle read errors, and end of media.
1105  */
1106 static void
1107 readtape(char *buf)
1108 {
1109         ssize_t rd, newvol, i;
1110         int cnt, seek_failed;
1111
1112         if (blkcnt < numtrec) {
1113                 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
1114                 blksread++;
1115                 tpblksread++;
1116                 return;
1117         }
1118         for (i = 0; i < ntrec; i++)
1119                 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
1120         if (numtrec == 0)
1121                 numtrec = ntrec;
1122         cnt = ntrec * TP_BSIZE;
1123         rd = 0;
1124 getmore:
1125 #ifdef RRESTORE
1126         if (host)
1127                 i = rmtread(&tapebuf[rd], cnt);
1128         else
1129 #endif
1130                 i = read(mt, &tapebuf[rd], cnt);
1131         /*
1132          * Check for mid-tape short read error.
1133          * If found, skip rest of buffer and start with the next.
1134          */
1135         if (!pipein && numtrec < ntrec && i > 0) {
1136                 Dprintf(stdout, "mid-media short read error.\n");
1137                 numtrec = ntrec;
1138         }
1139         /*
1140          * Handle partial block read.
1141          */
1142         if (pipein && i == 0 && rd > 0)
1143                 i = rd;
1144         else if (i > 0 && i != ntrec * TP_BSIZE) {
1145                 if (pipein) {
1146                         rd += i;
1147                         cnt -= i;
1148                         if (cnt > 0)
1149                                 goto getmore;
1150                         i = rd;
1151                 } else {
1152                         /*
1153                          * Short read. Process the blocks read.
1154                          */
1155                         if (i % TP_BSIZE != 0)
1156                                 Vprintf(stdout,
1157                                     "partial block read: %ld should be %ld\n",
1158                                     (long)i, ntrec * TP_BSIZE);
1159                         numtrec = i / TP_BSIZE;
1160                 }
1161         }
1162         /*
1163          * Handle read error.
1164          */
1165         if (i < 0) {
1166                 fprintf(stderr, "Tape read error while ");
1167                 switch (curfile.action) {
1168                 default:
1169                         fprintf(stderr, "trying to set up tape\n");
1170                         break;
1171                 case UNKNOWN:
1172                         fprintf(stderr, "trying to resynchronize\n");
1173                         break;
1174                 case USING:
1175                         fprintf(stderr, "restoring %s\n", curfile.name);
1176                         break;
1177                 case SKIP:
1178                         fprintf(stderr, "skipping over inode %lu\n",
1179                                 (unsigned long)curfile.ino);
1180                         break;
1181                 }
1182                 if (!yflag && !reply("continue"))
1183                         exit(1);
1184                 i = ntrec * TP_BSIZE;
1185                 memset(tapebuf, 0, (size_t)i);
1186 #ifdef RRESTORE
1187                 if (host)
1188                         seek_failed = (rmtseek(i, 1) < 0);
1189                 else
1190 #endif
1191                         seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1);
1192
1193                 if (seek_failed)
1194                         err(1, "continuation failed");
1195         }
1196         /*
1197          * Handle end of tape.
1198          */
1199         if (i == 0) {
1200                 Vprintf(stdout, "End-of-tape encountered\n");
1201                 if (!pipein) {
1202                         newvol = volno + 1;
1203                         volno = 0;
1204                         numtrec = 0;
1205                         getvol(newvol);
1206                         readtape(buf);
1207                         return;
1208                 }
1209                 if (rd % TP_BSIZE != 0)
1210                         panic("partial block read: %d should be %d\n",
1211                                 rd, ntrec * TP_BSIZE);
1212                 terminateinput();
1213                 memmove(&tapebuf[rd], &endoftapemark, TP_BSIZE);
1214         }
1215         blkcnt = 0;
1216         memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], TP_BSIZE);
1217         blksread++;
1218         tpblksread++;
1219 }
1220
1221 static void
1222 findtapeblksize(void)
1223 {
1224         register long i;
1225
1226         for (i = 0; i < ntrec; i++)
1227                 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
1228         blkcnt = 0;
1229 #ifdef RRESTORE
1230         if (host)
1231                 i = rmtread(tapebuf, (size_t)(ntrec * TP_BSIZE));
1232         else
1233 #endif
1234                 i = read(mt, tapebuf, (size_t)(ntrec * TP_BSIZE));
1235
1236         if (i <= 0)
1237                 err(1, "tape read error");
1238         if (i % TP_BSIZE != 0)
1239                 errx(1, "Tape block size (%ld) is not a multiple of dump block size (%d)",
1240                                 (long)i, TP_BSIZE);
1241         ntrec = i / TP_BSIZE;
1242         numtrec = ntrec;
1243         Vprintf(stdout, "Tape block size is %ld\n", ntrec);
1244 }
1245
1246 void
1247 closemt(void)
1248 {
1249
1250         if (mt < 0)
1251                 return;
1252 #ifdef RRESTORE
1253         if (host)
1254                 rmtclose();
1255         else
1256 #endif
1257                 (void) close(mt);
1258 }
1259
1260 /*
1261  * Read the next block from the tape.
1262  * Check to see if it is one of several vintage headers.
1263  * If it is an old style header, convert it to a new style header.
1264  * If it is not any valid header, return an error.
1265  */
1266 static int
1267 gethead(struct s_spcl *buf)
1268 {
1269         int32_t i;
1270         union {
1271                 quad_t  qval;
1272                 int32_t val[2];
1273         } qcvt;
1274         union u_ospcl {
1275                 char dummy[TP_BSIZE];
1276                 struct  s_ospcl {
1277                         int32_t c_type;
1278                         int32_t c_date;
1279                         int32_t c_ddate;
1280                         int32_t c_volume;
1281                         int32_t c_tapea;
1282                         u_int16_t c_inumber;
1283                         int32_t c_magic;
1284                         int32_t c_checksum;
1285                         struct odinode {
1286                                 u_int16_t odi_mode;
1287                                 u_int16_t odi_nlink;
1288                                 u_int16_t odi_uid;
1289                                 u_int16_t odi_gid;
1290                                 int32_t odi_size;
1291                                 int32_t odi_rdev;
1292                                 char    odi_addr[36];
1293                                 int32_t odi_atime;
1294                                 int32_t odi_mtime;
1295                                 int32_t odi_ctime;
1296                         } c_dinode;
1297                         int32_t c_count;
1298                         char    c_addr[256];
1299                 } s_ospcl;
1300         } u_ospcl;
1301
1302         if (!cvtflag) {
1303                 readtape((char *)buf);
1304                 if (buf->c_magic != NFS_MAGIC) {
1305                         if (swabi(buf->c_magic) != NFS_MAGIC)
1306                                 return (FAIL);
1307                         if (!Bcvt) {
1308                                 Vprintf(stdout, "Note: Doing Byte swapping\n");
1309                                 Bcvt = 1;
1310                         }
1311                 }
1312                 if (checksum((int *)buf) == FAIL)
1313                         return (FAIL);
1314                 if (Bcvt)
1315                         swabst((u_char *)"8i4s31i528bi192b2i", (u_char *)buf);
1316                 goto good;
1317         }
1318         readtape((char *)(&u_ospcl.s_ospcl));
1319         memset((char *)buf, 0, (long)TP_BSIZE);
1320         buf->c_type = u_ospcl.s_ospcl.c_type;
1321         buf->c_date = u_ospcl.s_ospcl.c_date;
1322         buf->c_ddate = u_ospcl.s_ospcl.c_ddate;
1323         buf->c_volume = u_ospcl.s_ospcl.c_volume;
1324         buf->c_tapea = u_ospcl.s_ospcl.c_tapea;
1325         buf->c_inumber = u_ospcl.s_ospcl.c_inumber;
1326         buf->c_checksum = u_ospcl.s_ospcl.c_checksum;
1327         buf->c_magic = u_ospcl.s_ospcl.c_magic;
1328         buf->c_dinode.di_mode = u_ospcl.s_ospcl.c_dinode.odi_mode;
1329         buf->c_dinode.di_nlink = u_ospcl.s_ospcl.c_dinode.odi_nlink;
1330         buf->c_dinode.di_uid = u_ospcl.s_ospcl.c_dinode.odi_uid;
1331         buf->c_dinode.di_gid = u_ospcl.s_ospcl.c_dinode.odi_gid;
1332         buf->c_dinode.di_size = u_ospcl.s_ospcl.c_dinode.odi_size;
1333         buf->c_dinode.di_rdev = u_ospcl.s_ospcl.c_dinode.odi_rdev;
1334 #ifdef  __linux__
1335         buf->c_dinode.di_atime.tv_sec = u_ospcl.s_ospcl.c_dinode.odi_atime;
1336         buf->c_dinode.di_mtime.tv_sec = u_ospcl.s_ospcl.c_dinode.odi_mtime;
1337         buf->c_dinode.di_ctime.tv_sec = u_ospcl.s_ospcl.c_dinode.odi_ctime;
1338 #else   /* __linux__ */
1339         buf->c_dinode.di_atime = u_ospcl.s_ospcl.c_dinode.odi_atime;
1340         buf->c_dinode.di_mtime = u_ospcl.s_ospcl.c_dinode.odi_mtime;
1341         buf->c_dinode.di_ctime = u_ospcl.s_ospcl.c_dinode.odi_ctime;
1342 #endif  /* __linux__ */
1343         buf->c_count = u_ospcl.s_ospcl.c_count;
1344         memmove(buf->c_addr, u_ospcl.s_ospcl.c_addr, (long)256);
1345         if (u_ospcl.s_ospcl.c_magic != OFS_MAGIC ||
1346             checksum((int *)(&u_ospcl.s_ospcl)) == FAIL)
1347                 return(FAIL);
1348         buf->c_magic = NFS_MAGIC;
1349
1350 good:
1351         if ((buf->c_dinode.di_size == 0 || buf->c_dinode.di_size > 0xfffffff) &&
1352             (buf->c_dinode.di_mode & IFMT) == IFDIR && Qcvt == 0) {
1353                 qcvt.qval = buf->c_dinode.di_size;
1354                 if (qcvt.val[0] || qcvt.val[1]) {
1355                         printf("Note: Doing Quad swapping\n");
1356                         Qcvt = 1;
1357                 }
1358         }
1359         if (Qcvt) {
1360                 qcvt.qval = buf->c_dinode.di_size;
1361                 i = qcvt.val[1];
1362                 qcvt.val[1] = qcvt.val[0];
1363                 qcvt.val[0] = i;
1364                 buf->c_dinode.di_size = qcvt.qval;
1365         }
1366         readmapflag = 0;
1367
1368         switch (buf->c_type) {
1369
1370         case TS_CLRI:
1371         case TS_BITS:
1372                 /*
1373                  * Have to patch up missing information in bit map headers
1374                  */
1375                 buf->c_inumber = 0;
1376                 buf->c_dinode.di_size = buf->c_count * TP_BSIZE;
1377                 if (buf->c_count > TP_NINDIR)
1378                         readmapflag = 1;
1379                 else
1380                         for (i = 0; i < buf->c_count; i++)
1381                                 buf->c_addr[i]++;
1382                 break;
1383
1384         case TS_TAPE:
1385                 if ((buf->c_flags & DR_NEWINODEFMT) == 0)
1386                         oldinofmt = 1;
1387                 /* fall through */
1388         case TS_END:
1389                 buf->c_inumber = 0;
1390                 break;
1391
1392         case TS_INODE:
1393         case TS_ADDR:
1394                 break;
1395
1396         default:
1397                 panic("gethead: unknown inode type %d\n", buf->c_type);
1398                 break;
1399         }
1400         /*
1401          * If we are restoring a filesystem with old format inodes,
1402          * copy the uid/gid to the new location.
1403          */
1404         if (oldinofmt) {
1405                 buf->c_dinode.di_uid = buf->c_dinode.di_ouid;
1406                 buf->c_dinode.di_gid = buf->c_dinode.di_ogid;
1407         }
1408         if (dflag)
1409                 accthdr(buf);
1410         return(GOOD);
1411 }
1412
1413 /*
1414  * Check that a header is where it belongs and predict the next header
1415  */
1416 static void
1417 accthdr(struct s_spcl *header)
1418 {
1419         static ino_t previno = 0x7fffffff;
1420         static int prevtype;
1421         static long predict;
1422         long blks, i;
1423
1424         if (header->c_type == TS_TAPE) {
1425                 fprintf(stderr, "Volume header (%s inode format) ",
1426                     oldinofmt ? "old" : "new");
1427                 if (header->c_firstrec)
1428                         fprintf(stderr, "begins with record %d",
1429                                 header->c_firstrec);
1430                 fprintf(stderr, "\n");
1431                 previno = 0x7fffffff;
1432                 return;
1433         }
1434         if (previno == 0x7fffffff)
1435                 goto newcalc;
1436         switch (prevtype) {
1437         case TS_BITS:
1438                 fprintf(stderr, "Dumped inodes map header");
1439                 break;
1440         case TS_CLRI:
1441                 fprintf(stderr, "Used inodes map header");
1442                 break;
1443         case TS_INODE:
1444                 fprintf(stderr, "File header, ino %lu", (unsigned long)previno);
1445                 break;
1446         case TS_ADDR:
1447                 fprintf(stderr, "File continuation header, ino %ld", (long)previno);
1448                 break;
1449         case TS_END:
1450                 fprintf(stderr, "End of tape header");
1451                 break;
1452         }
1453         if (predict != blksread - 1)
1454                 fprintf(stderr, "; predicted %ld blocks, got %ld blocks",
1455                         predict, blksread - 1);
1456         fprintf(stderr, "\n");
1457 newcalc:
1458         blks = 0;
1459         if (header->c_type != TS_END)
1460                 for (i = 0; i < header->c_count; i++)
1461                         if (readmapflag || header->c_addr[i] != 0)
1462                                 blks++;
1463         predict = blks;
1464         blksread = 0;
1465         prevtype = header->c_type;
1466         previno = header->c_inumber;
1467 }
1468
1469 /*
1470  * Find an inode header.
1471  * Complain if had to skip, and complain is set.
1472  */
1473 static void
1474 findinode(struct s_spcl *header)
1475 {
1476         static long skipcnt = 0;
1477         long i;
1478         char buf[TP_BSIZE];
1479
1480         curfile.name = "<name unknown>";
1481         curfile.action = UNKNOWN;
1482         curfile.dip = NULL;
1483         curfile.ino = 0;
1484         do {
1485                 if (header->c_magic != NFS_MAGIC) {
1486                         skipcnt++;
1487                         while (gethead(header) == FAIL ||
1488                             header->c_date != dumpdate)
1489                                 skipcnt++;
1490                 }
1491                 switch (header->c_type) {
1492
1493                 case TS_ADDR:
1494                         /*
1495                          * Skip up to the beginning of the next record
1496                          */
1497                         for (i = 0; i < header->c_count; i++)
1498                                 if (header->c_addr[i])
1499                                         readtape(buf);
1500                         while (gethead(header) == FAIL ||
1501                             header->c_date != dumpdate)
1502                                 skipcnt++;
1503                         break;
1504
1505                 case TS_INODE:
1506                         curfile.dip = &header->c_dinode;
1507                         curfile.ino = header->c_inumber;
1508                         break;
1509
1510                 case TS_END:
1511                         curfile.ino = maxino;
1512                         break;
1513
1514                 case TS_CLRI:
1515                         curfile.name = "<file removal list>";
1516                         break;
1517
1518                 case TS_BITS:
1519                         curfile.name = "<file dump list>";
1520                         break;
1521
1522                 case TS_TAPE:
1523                         panic("unexpected tape header\n");
1524                         /* NOTREACHED */
1525
1526                 default:
1527                         panic("unknown tape header type %d\n", spcl.c_type);
1528                         /* NOTREACHED */
1529
1530                 }
1531         } while (header->c_type == TS_ADDR);
1532         if (skipcnt > 0)
1533                 fprintf(stderr, "resync restore, skipped %ld blocks\n",
1534                     skipcnt);
1535         skipcnt = 0;
1536 }
1537
1538 static int
1539 checksum(int *buf)
1540 {
1541         register int i, j;
1542
1543         j = sizeof(union u_spcl) / sizeof(int);
1544         i = 0;
1545         if(!Bcvt) {
1546                 do
1547                         i += *buf++;
1548                 while (--j);
1549         } else {
1550                 /* What happens if we want to read restore tapes
1551                         for a 16bit int machine??? */
1552                 do
1553                         i += swabi(*buf++);
1554                 while (--j);
1555         }
1556
1557         if (i != CHECKSUM) {
1558                 fprintf(stderr, "Checksum error %o, inode %lu file %s\n", i,
1559                         (unsigned long)curfile.ino, curfile.name);
1560                 return(FAIL);
1561         }
1562         return(GOOD);
1563 }
1564
1565 #ifdef RRESTORE
1566 #ifdef __STDC__
1567 #include <stdarg.h>
1568 #else
1569 #include <varargs.h>
1570 #endif
1571
1572 void
1573 #ifdef __STDC__
1574 msg(const char *fmt, ...)
1575 #else
1576 msg(fmt, va_alist)
1577         char *fmt;
1578         va_dcl
1579 #endif
1580 {
1581         va_list ap;
1582 #ifdef __STDC__
1583         va_start(ap, fmt);
1584 #else
1585         va_start(ap);
1586 #endif
1587         (void)vfprintf(stderr, fmt, ap);
1588         va_end(ap);
1589 }
1590 #endif /* RRESTORE */
1591
1592 static u_char *
1593 swab16(u_char *sp, int n)
1594 {
1595         char c;
1596
1597         while (--n >= 0) {
1598                 c = sp[0]; sp[0] = sp[1]; sp[1] = c;
1599                 sp += 2;
1600         }
1601         return (sp);
1602 }
1603
1604 static u_char *
1605 swab32(u_char *sp, int n)
1606 {
1607         char c;
1608
1609         while (--n >= 0) {
1610                 c = sp[0]; sp[0] = sp[3]; sp[3] = c;
1611                 c = sp[1]; sp[1] = sp[2]; sp[2] = c;
1612                 sp += 4;
1613         }
1614         return (sp);
1615 }
1616
1617 static u_char *
1618 swab64(u_char *sp, int n)
1619 {
1620         char c;
1621
1622         while (--n >= 0) {
1623                 c = sp[0]; sp[0] = sp[7]; sp[7] = c;
1624                 c = sp[1]; sp[1] = sp[6]; sp[6] = c;
1625                 c = sp[2]; sp[2] = sp[5]; sp[5] = c;
1626                 c = sp[3]; sp[3] = sp[4]; sp[4] = c;
1627                 sp += 8;
1628         }
1629         return (sp);
1630 }
1631
1632 void
1633 swabst(u_char *cp, u_char *sp)
1634 {
1635         int n = 0;
1636
1637         while (*cp) {
1638                 switch (*cp) {
1639                 case '0': case '1': case '2': case '3': case '4':
1640                 case '5': case '6': case '7': case '8': case '9':
1641                         n = (n * 10) + (*cp++ - '0');
1642                         continue;
1643
1644                 case 's': case 'w': case 'h':
1645                         if (n == 0)
1646                                 n = 1;
1647                         sp = swab16(sp, n);
1648                         break;
1649
1650                 case 'i':
1651                         if (n == 0)
1652                                 n = 1;
1653                         sp = swab32(sp, n);
1654                         break;
1655
1656                 case 'l':
1657                         if (n == 0)
1658                                 n = 1;
1659                         sp = swab64(sp, n);
1660                         break;
1661
1662                 default: /* Any other character, like 'b' counts as byte. */
1663                         if (n == 0)
1664                                 n = 1;
1665                         sp += n;
1666                         break;
1667                 }
1668                 cp++;
1669                 n = 0;
1670         }
1671 }
1672
1673 static u_int
1674 swabi(u_int x)
1675 {
1676         swabst((u_char *)"i", (u_char *)&x);
1677         return (x);
1678 }
1679
1680 static u_long
1681 swabl(u_long x)
1682 {
1683         swabst((u_char *)"l", (u_char *)&x);
1684         return (x);
1685 }