1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)tape.c 8.9 (Berkeley) 5/1/95
35 * $FreeBSD: src/sbin/restore/tape.c,v 1.16.2.8 2002/06/30 22:57:52 iedowse Exp $
36 */
37
38 #include <sys/param.h>
39 #include <sys/mtio.h>
40 #include <sys/stat.h>
41 #include <sys/time.h>
42
43 #include <vfs/ufs/dinode.h>
44 #include <protocols/dumprestore.h>
45
46 #include <errno.h>
47 #include <fcntl.h>
48 #include <paths.h>
49 #include <setjmp.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <time.h>
54 #include <unistd.h>
55
56 #include "restore.h"
57 #include "extern.h"
58
59 static long fssize = MAXBSIZE;
60 static int mt = -1;
61 static int pipein = 0;
62 static char *magtape;
63 static int blkcnt;
64 static int numtrec;
65 static char *tapebuf;
66 static union u_spcl endoftapemark;
67 static long blksread; /* blocks read since last header */
68 static long tapeaddr = 0; /* current TP_BSIZE tape record */
69 static long tapesread;
70 static jmp_buf restart;
71 static int gettingfile = 0; /* restart has a valid frame */
72 static char *host = NULL;
73
74 static int ofile;
75 static char *map;
76 static char lnkbuf[MAXPATHLEN + 1];
77 static int pathlen;
78
79 union u_spcl u_spcl; /* describes next file available on the tape */
80 int oldinofmt; /* old inode format conversion required */
81 struct context curfile; /* describes next file available on the tape */
82 int Bcvt; /* Swap Bytes (for CCI or sun) */
83 static int Qcvt; /* Swap quads (for sun) */
84
85 #define FLUSHTAPEBUF() blkcnt = ntrec + 1
86
87 static void accthdr(struct s_spcl *);
88 static int checksum(int *);
89 static void findinode(struct s_spcl *);
90 static void findtapeblksize(void);
91 static int gethead(struct s_spcl *);
92 static void readtape(char *);
93 static void setdumpnum(void);
94 static u_long swabl(u_long);
95 static u_char *swablong(u_char *, int);
96 static u_char *swabshort(u_char *, int);
97 static void terminateinput(void);
98 static void xtrfile(char *, size_t);
99 static void xtrlnkfile(char *, size_t);
100 static void xtrlnkskip(char *, size_t);
101 static void xtrmap(char *, size_t);
102 static void xtrmapskip(char *, size_t);
103 static void xtrskip(char *, size_t);
104
105 static int readmapflag;
106
107 /*
108 * Set up an input source
109 */
110 void
setinput(char * source)111 setinput(char *source)
112 {
113 FLUSHTAPEBUF();
114 if (bflag)
115 newtapebuf(ntrec);
116 else
117 newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC);
118 terminal = stdin;
119
120 #ifdef RRESTORE
121 if (strchr(source, ':')) {
122 host = source;
123 source = strchr(host, ':');
124 *source++ = '\0';
125 if (rmthost(host) == 0)
126 done(1);
127 } else
128 #endif
129 if (strcmp(source, "-") == 0) {
130 /*
131 * Since input is coming from a pipe we must establish
132 * our own connection to the terminal.
133 */
134 terminal = fopen(_PATH_TTY, "r");
135 if (terminal == NULL) {
136 fprintf(stderr, "cannot open %s: %s\n",
137 _PATH_TTY, strerror(errno));
138 terminal = fopen(_PATH_DEVNULL, "r");
139 if (terminal == NULL) {
140 fprintf(stderr, "cannot open %s: %s\n",
141 _PATH_DEVNULL, strerror(errno));
142 done(1);
143 }
144 }
145 pipein++;
146 }
147 setuid(getuid()); /* no longer need or want root privileges */
148 magtape = strdup(source);
149 if (magtape == NULL) {
150 fprintf(stderr, "Cannot allocate space for magtape buffer\n");
151 done(1);
152 }
153 }
154
155 void
newtapebuf(long size)156 newtapebuf(long size)
157 {
158 static long tapebufsize = -1;
159
160 ntrec = size;
161 if (size <= tapebufsize)
162 return;
163 if (tapebuf != NULL)
164 free(tapebuf);
165 tapebuf = malloc(size * TP_BSIZE);
166 if (tapebuf == NULL) {
167 fprintf(stderr, "Cannot allocate space for tape buffer\n");
168 done(1);
169 }
170 tapebufsize = size;
171 }
172
173 /*
174 * Verify that the tape drive can be accessed and
175 * that it actually is a dump tape.
176 */
177 void
setup(void)178 setup(void)
179 {
180 int i, j, *ip;
181 struct stat stbuf;
182
183 vprintf(stdout, "Verify tape and initialize maps\n");
184 #ifdef RRESTORE
185 if (host)
186 mt = rmtopen(magtape, 0);
187 else
188 #endif
189 if (pipein)
190 mt = 0;
191 else
192 mt = open(magtape, O_RDONLY, 0);
193 if (mt < 0) {
194 fprintf(stderr, "%s: %s\n", magtape, strerror(errno));
195 done(1);
196 }
197 volno = 1;
198 setdumpnum();
199 FLUSHTAPEBUF();
200 if (!pipein && !bflag)
201 findtapeblksize();
202 if (gethead(&spcl) == FAIL) {
203 blkcnt--; /* push back this block */
204 blksread--;
205 cvtflag++;
206 if (gethead(&spcl) == FAIL) {
207 fprintf(stderr, "Tape is not a dump tape\n");
208 done(1);
209 }
210 fprintf(stderr, "Converting to new file system format.\n");
211 }
212 if (pipein) {
213 endoftapemark.s_spcl.c_magic = cvtflag ? OFS_MAGIC : NFS_MAGIC;
214 endoftapemark.s_spcl.c_type = TS_END;
215 ip = (int *)&endoftapemark;
216 j = sizeof(union u_spcl) / sizeof(int);
217 i = 0;
218 do
219 i += *ip++;
220 while (--j);
221 endoftapemark.s_spcl.c_checksum = CHECKSUM - i;
222 }
223 if (vflag || command == 't')
224 printdumpinfo();
225 dumptime = spcl.c_ddate;
226 dumpdate = spcl.c_date;
227 if (stat(".", &stbuf) < 0) {
228 fprintf(stderr, "cannot stat .: %s\n", strerror(errno));
229 done(1);
230 }
231 if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE )
232 fssize = TP_BSIZE;
233 if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE)
234 fssize = stbuf.st_blksize;
235 if (((fssize - 1) & fssize) != 0) {
236 fprintf(stderr, "bad block size %ld\n", fssize);
237 done(1);
238 }
239 if (spcl.c_volume != 1) {
240 fprintf(stderr, "Tape is not volume 1 of the dump\n");
241 done(1);
242 }
243 if (gethead(&spcl) == FAIL) {
244 dprintf(stdout, "header read failed at %ld blocks\n", blksread);
245 panic("no header after volume mark!\n");
246 }
247 findinode(&spcl);
248 if (spcl.c_type != TS_CLRI) {
249 fprintf(stderr, "Cannot find file removal list\n");
250 done(1);
251 }
252 maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
253 dprintf(stdout, "maxino = %d\n", maxino);
254 map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
255 if (map == NULL)
256 panic("no memory for active inode map\n");
257 usedinomap = map;
258 curfile.action = USING;
259 getfile(xtrmap, xtrmapskip);
260 if (spcl.c_type != TS_BITS) {
261 fprintf(stderr, "Cannot find file dump list\n");
262 done(1);
263 }
264 map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
265 if (map == NULL)
266 panic("no memory for file dump list\n");
267 dumpmap = map;
268 curfile.action = USING;
269 getfile(xtrmap, xtrmapskip);
270 /*
271 * If there may be whiteout entries on the tape, pretend that the
272 * whiteout inode exists, so that the whiteout entries can be
273 * extracted.
274 */
275 if (oldinofmt == 0)
276 SETINO(UFS_WINO, dumpmap);
277 /* 'r' restores don't call getvol() for tape 1, so mark it as read. */
278 if (command == 'r')
279 tapesread = 1;
280 }
281
282 /*
283 * Prompt user to load a new dump volume.
284 * "Nextvol" is the next suggested volume to use.
285 * This suggested volume is enforced when doing full
286 * or incremental restores, but can be overridden by
287 * the user when only extracting a subset of the files.
288 */
289 void
getvol(long nextvol)290 getvol(long nextvol)
291 {
292 long newvol = 0, prevtapea, savecnt, i;
293 union u_spcl tmpspcl;
294 # define tmpbuf tmpspcl.s_spcl
295 char buf[TP_BSIZE];
296
297 if (nextvol == 1) {
298 tapesread = 0;
299 gettingfile = 0;
300 }
301 prevtapea = tapeaddr;
302 savecnt = blksread;
303 if (pipein) {
304 if (nextvol != 1) {
305 panic("Changing volumes on pipe input?\n");
306 /* Avoid looping if we couldn't ask the user. */
307 if (yflag || ferror(terminal) || feof(terminal))
308 done(1);
309 }
310 if (volno == 1)
311 return;
312 goto gethdr;
313 }
314 again:
315 if (pipein)
316 done(1); /* pipes do not get a second chance */
317 if (command == 'R' || command == 'r' || curfile.action != SKIP)
318 newvol = nextvol;
319 else
320 newvol = 0;
321 while (newvol <= 0) {
322 if (tapesread == 0) {
323 fprintf(stderr, "%s%s%s%s%s%s%s",
324 "You have not read any tapes yet.\n",
325 "If you are extracting just a few files,",
326 " start with the last volume\n",
327 "and work towards the first; restore",
328 " can quickly skip tapes that\n",
329 "have no further files to extract.",
330 " Otherwise, begin with volume 1.\n");
331 } else {
332 fprintf(stderr, "You have read volumes");
333 strcpy(buf, ": ");
334 for (i = 0; i < 32; i++)
335 if (tapesread & (1 << i)) {
336 fprintf(stderr, "%s%ld", buf, i + 1);
337 strcpy(buf, ", ");
338 }
339 fprintf(stderr, "\n");
340 }
341 do {
342 fprintf(stderr, "Specify next volume #: ");
343 fflush(stderr);
344 if (fgets(buf, BUFSIZ, terminal) == NULL)
345 done(1);
346 } while (buf[0] == '\n');
347 newvol = atoi(buf);
348 if (newvol <= 0) {
349 fprintf(stderr,
350 "Volume numbers are positive numerics\n");
351 }
352 }
353 if (newvol == volno) {
354 tapesread |= 1 << (volno - 1);
355 return;
356 }
357 closemt();
358 fprintf(stderr, "Mount tape volume %ld\n", newvol);
359 fprintf(stderr, "Enter ``none'' if there are no more tapes\n");
360 fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape);
361 fflush(stderr);
362 if (fgets(buf, BUFSIZ, terminal) == NULL)
363 done(1);
364 if (!strcmp(buf, "none\n")) {
365 terminateinput();
366 return;
367 }
368 if (buf[0] != '\n') {
369 strcpy(magtape, buf);
370 magtape[strlen(magtape) - 1] = '\0';
371 }
372 #ifdef RRESTORE
373 if (host)
374 mt = rmtopen(magtape, 0);
375 else
376 #endif
377 mt = open(magtape, O_RDONLY, 0);
378
379 if (mt == -1) {
380 fprintf(stderr, "Cannot open %s\n", magtape);
381 volno = -1;
382 goto again;
383 }
384 gethdr:
385 volno = newvol;
386 setdumpnum();
387 FLUSHTAPEBUF();
388 if (gethead(&tmpbuf) == FAIL) {
389 dprintf(stdout, "header read failed at %ld blocks\n", blksread);
390 fprintf(stderr, "tape is not dump tape\n");
391 volno = 0;
392 goto again;
393 }
394 if (tmpbuf.c_volume != volno) {
395 fprintf(stderr, "Wrong volume (%ld)\n", (long)tmpbuf.c_volume);
396 volno = 0;
397 goto again;
398 }
399 if (tmpbuf.c_date != dumpdate || tmpbuf.c_ddate != dumptime) {
400 time_t c_date = tmpbuf.c_date;
401 fprintf(stderr, "Wrong dump date\n\tgot: %s", ctime(&c_date));
402 fprintf(stderr, "\twanted: %s", ctime(&dumpdate));
403 volno = 0;
404 goto again;
405 }
406 tapesread |= 1 << (volno - 1);
407 blksread = savecnt;
408 /*
409 * If continuing from the previous volume, skip over any
410 * blocks read already at the end of the previous volume.
411 *
412 * If coming to this volume at random, skip to the beginning
413 * of the next record.
414 */
415 dprintf(stdout, "last rec %ld, tape starts with %ld\n", prevtapea,
416 (long)tmpbuf.c_tapea);
417 if (tmpbuf.c_type == TS_TAPE && (tmpbuf.c_flags & DR_NEWHEADER)) {
418 if (curfile.action != USING) {
419 /*
420 * XXX Dump incorrectly sets c_count to 1 in the
421 * volume header of the first tape, so ignore
422 * c_count when volno == 1.
423 */
424 if (volno != 1)
425 for (i = tmpbuf.c_count; i > 0; i--)
426 readtape(buf);
427 } else if (tmpbuf.c_tapea <= prevtapea) {
428 /*
429 * Normally the value of c_tapea in the volume
430 * header is the record number of the header itself.
431 * However in the volume header following an EOT-
432 * terminated tape, it is the record number of the
433 * first continuation data block (dump bug?).
434 *
435 * The next record we want is `prevtapea + 1'.
436 */
437 i = prevtapea + 1 - tmpbuf.c_tapea;
438 dprintf(stderr, "Skipping %ld duplicate record%s.\n",
439 i, i > 1 ? "s" : "");
440 while (--i >= 0)
441 readtape(buf);
442 }
443 }
444 if (curfile.action == USING) {
445 if (volno == 1)
446 panic("active file into volume 1\n");
447 return;
448 }
449 gethead(&spcl);
450 findinode(&spcl);
451 if (gettingfile) {
452 gettingfile = 0;
453 longjmp(restart, 1);
454 }
455 }
456
457 /*
458 * Handle unexpected EOF.
459 */
460 static void
terminateinput(void)461 terminateinput(void)
462 {
463
464 if (gettingfile && curfile.action == USING) {
465 printf("Warning: %s %s\n",
466 "End-of-input encountered while extracting", curfile.name);
467 }
468 curfile.name = "<name unknown>";
469 curfile.action = UNKNOWN;
470 curfile.dip = NULL;
471 curfile.ino = maxino;
472 if (gettingfile) {
473 gettingfile = 0;
474 longjmp(restart, 1);
475 }
476 }
477
478 /*
479 * handle multiple dumps per tape by skipping forward to the
480 * appropriate one.
481 */
482 static void
setdumpnum(void)483 setdumpnum(void)
484 {
485 struct mtop tcom;
486
487 if (dumpnum == 1 || volno != 1)
488 return;
489 if (pipein) {
490 fprintf(stderr, "Cannot have multiple dumps on pipe input\n");
491 done(1);
492 }
493 tcom.mt_op = MTFSF;
494 tcom.mt_count = dumpnum - 1;
495 #ifdef RRESTORE
496 if (host)
497 rmtioctl(MTFSF, dumpnum - 1);
498 else
499 #endif
500 if (ioctl(mt, MTIOCTOP, (char *)&tcom) < 0)
501 fprintf(stderr, "ioctl MTFSF: %s\n", strerror(errno));
502 }
503
504 void
printdumpinfo(void)505 printdumpinfo(void)
506 {
507 time_t c_date = spcl.c_date;
508 time_t c_ddate = spcl.c_ddate;
509
510 fprintf(stdout, "Dump date: %s", ctime(&c_date));
511 fprintf(stdout, "Dumped from: %s",
512 (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&c_ddate));
513 if (spcl.c_host[0] == '\0')
514 return;
515 fprintf(stderr, "Level %ld dump of %s on %s:%s\n",
516 (long)spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev);
517 fprintf(stderr, "Label: %s\n", spcl.c_label);
518 }
519
520 int
extractfile(char * name)521 extractfile(char *name)
522 {
523 int flags;
524 uid_t uid;
525 gid_t gid;
526 mode_t mode;
527 struct timeval timep[2];
528 struct entry *ep;
529
530 curfile.name = name;
531 curfile.action = USING;
532 timep[0].tv_sec = curfile.dip->di_atime;
533 timep[0].tv_usec = curfile.dip->di_atimensec / 1000;
534 timep[1].tv_sec = curfile.dip->di_mtime;
535 timep[1].tv_usec = curfile.dip->di_mtimensec / 1000;
536 uid = curfile.dip->di_uid;
537 gid = curfile.dip->di_gid;
538 mode = curfile.dip->di_mode;
539 flags = curfile.dip->di_flags;
540 switch (mode & IFMT) {
541
542 default:
543 fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode);
544 skipfile();
545 return (FAIL);
546
547 case IFSOCK:
548 vprintf(stdout, "skipped socket %s\n", name);
549 skipfile();
550 return (GOOD);
551
552 case IFDIR:
553 if (mflag) {
554 ep = lookupname(name);
555 if (ep == NULL || ep->e_flags & EXTRACT)
556 panic("unextracted directory %s\n", name);
557 skipfile();
558 return (GOOD);
559 }
560 vprintf(stdout, "extract file %s\n", name);
561 return (genliteraldir(name, curfile.ino));
562
563 case IFLNK:
564 lnkbuf[0] = '\0';
565 pathlen = 0;
566 getfile(xtrlnkfile, xtrlnkskip);
567 if (pathlen == 0) {
568 vprintf(stdout,
569 "%s: zero length symbolic link (ignored)\n", name);
570 return (GOOD);
571 }
572 if (linkit(lnkbuf, name, SYMLINK) == GOOD) {
573 lchown(name, uid, gid);
574 lchmod(name, mode);
575 lutimes(name, timep);
576 return (GOOD);
577 }
578 return (FAIL);
579
580 case IFIFO:
581 vprintf(stdout, "extract fifo %s\n", name);
582 if (Nflag) {
583 skipfile();
584 return (GOOD);
585 }
586 if (uflag && !Nflag)
587 unlink(name);
588 if (mkfifo(name, mode) < 0) {
589 fprintf(stderr, "%s: cannot create fifo: %s\n",
590 name, strerror(errno));
591 skipfile();
592 return (FAIL);
593 }
594 chown(name, uid, gid);
595 chmod(name, mode);
596 utimes(name, timep);
597 chflags(name, flags);
598 skipfile();
599 return (GOOD);
600
601 case IFCHR:
602 case IFBLK:
603 vprintf(stdout, "extract special file %s\n", name);
604 if (Nflag) {
605 skipfile();
606 return (GOOD);
607 }
608 if (uflag)
609 unlink(name);
610 if (mknod(name, mode, (int)curfile.dip->di_rdev) < 0) {
611 fprintf(stderr, "%s: cannot create special file: %s\n",
612 name, strerror(errno));
613 skipfile();
614 return (FAIL);
615 }
616 chown(name, uid, gid);
617 chmod(name, mode);
618 utimes(name, timep);
619 chflags(name, flags);
620 skipfile();
621 return (GOOD);
622
623 case IFREG:
624 vprintf(stdout, "extract file %s\n", name);
625 if (Nflag) {
626 skipfile();
627 return (GOOD);
628 }
629 if (uflag)
630 unlink(name);
631 if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC,
632 0666)) < 0) {
633 fprintf(stderr, "%s: cannot create file: %s\n",
634 name, strerror(errno));
635 skipfile();
636 return (FAIL);
637 }
638 fchown(ofile, uid, gid);
639 fchmod(ofile, mode);
640 getfile(xtrfile, xtrskip);
641 close(ofile);
642 utimes(name, timep);
643 chflags(name, flags);
644 return (GOOD);
645 }
646 /* NOTREACHED */
647 }
648
649 /*
650 * skip over bit maps on the tape
651 */
652 void
skipmaps(void)653 skipmaps(void)
654 {
655
656 while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI)
657 skipfile();
658 }
659
660 /*
661 * skip over a file on the tape
662 */
663 void
skipfile(void)664 skipfile(void)
665 {
666
667 curfile.action = SKIP;
668 getfile(xtrnull, xtrnull);
669 }
670
671 /*
672 * Extract a file from the tape.
673 * When an allocated block is found it is passed to the fill function;
674 * when an unallocated block (hole) is found, a zeroed buffer is passed
675 * to the skip function.
676 */
677 void
getfile(void (* fill)(char *,size_t),void (* skip)(char *,size_t))678 getfile(void (*fill)(char *, size_t), void (*skip)(char *, size_t))
679 {
680 int i;
681 volatile int curblk = 0; /* avoid -Wclobbered */
682 volatile quad_t size = spcl.c_dinode.di_size;
683 static char clearedbuf[MAXBSIZE];
684 char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
685 char junk[TP_BSIZE];
686
687 if (spcl.c_type == TS_END)
688 panic("ran off end of tape\n");
689 if (spcl.c_magic != NFS_MAGIC)
690 panic("not at beginning of a file\n");
691 if (!gettingfile && setjmp(restart) != 0)
692 return;
693 gettingfile++;
694 loop:
695 for (i = 0; i < spcl.c_count; i++) {
696 if (readmapflag || spcl.c_addr[i]) {
697 readtape(&buf[curblk++][0]);
698 if (curblk == fssize / TP_BSIZE) {
699 (*fill)((char *)buf, (long)(size > TP_BSIZE ?
700 fssize : (curblk - 1) * TP_BSIZE + size));
701 curblk = 0;
702 }
703 } else {
704 if (curblk > 0) {
705 (*fill)((char *)buf, (long)(size > TP_BSIZE ?
706 curblk * TP_BSIZE :
707 (curblk - 1) * TP_BSIZE + size));
708 curblk = 0;
709 }
710 (*skip)(clearedbuf, (long)(size > TP_BSIZE ?
711 TP_BSIZE : size));
712 }
713 if ((size -= TP_BSIZE) <= 0) {
714 for (i++; i < spcl.c_count; i++)
715 if (readmapflag || spcl.c_addr[i])
716 readtape(junk);
717 break;
718 }
719 }
720 if (gethead(&spcl) == GOOD && size > 0) {
721 if (spcl.c_type == TS_ADDR)
722 goto loop;
723 dprintf(stdout,
724 "Missing address (header) block for %s at %ld blocks\n",
725 curfile.name, blksread);
726 }
727 if (curblk > 0)
728 (*fill)((char *)buf, (long)((curblk * TP_BSIZE) + size));
729 findinode(&spcl);
730 gettingfile = 0;
731 }
732
733 /*
734 * Write out the next block of a file.
735 */
736 static void
xtrfile(char * buf,size_t size)737 xtrfile(char *buf, size_t size)
738 {
739
740 if (Nflag)
741 return;
742 if (write(ofile, buf, (int) size) == -1) {
743 fprintf(stderr,
744 "write error extracting inode %ju, name %s\nwrite: %s\n",
745 (uintmax_t)curfile.ino, curfile.name, strerror(errno));
746 }
747 }
748
749 /*
750 * Skip over a hole in a file.
751 */
752 /* ARGSUSED */
753 static void
xtrskip(char * buf __unused,size_t size)754 xtrskip(char *buf __unused, size_t size)
755 {
756
757 if (lseek(ofile, size, SEEK_CUR) == -1) {
758 fprintf(stderr,
759 "seek error extracting inode %ju, name %s\nlseek: %s\n",
760 (uintmax_t)curfile.ino, curfile.name, strerror(errno));
761 done(1);
762 }
763 }
764
765 /*
766 * Collect the next block of a symbolic link.
767 */
768 static void
xtrlnkfile(char * buf,size_t size)769 xtrlnkfile(char *buf, size_t size)
770 {
771
772 pathlen += size;
773 if (pathlen > MAXPATHLEN) {
774 fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n",
775 curfile.name, lnkbuf, buf, pathlen);
776 done(1);
777 }
778 strcat(lnkbuf, buf);
779 }
780
781 /*
782 * Skip over a hole in a symbolic link (should never happen).
783 */
784 /* ARGSUSED */
785 static void
xtrlnkskip(char * buf __unused,size_t size __unused)786 xtrlnkskip(char *buf __unused, size_t size __unused)
787 {
788
789 fprintf(stderr, "unallocated block in symbolic link %s\n",
790 curfile.name);
791 done(1);
792 }
793
794 /*
795 * Collect the next block of a bit map.
796 */
797 static void
xtrmap(char * buf,size_t size)798 xtrmap(char *buf, size_t size)
799 {
800
801 memmove(map, buf, size);
802 map += size;
803 }
804
805 /*
806 * Skip over a hole in a bit map (should never happen).
807 */
808 /* ARGSUSED */
809 static void
xtrmapskip(char * buf __unused,size_t size)810 xtrmapskip(char *buf __unused, size_t size)
811 {
812
813 panic("hole in map\n");
814 map += size;
815 }
816
817 /*
818 * Noop, when an extraction function is not needed.
819 */
820 /* ARGSUSED */
821 void
xtrnull(char * buf __unused,size_t size __unused)822 xtrnull(char *buf __unused, size_t size __unused)
823 {
824
825 return;
826 }
827
828 /*
829 * Read TP_BSIZE blocks from the input.
830 * Handle read errors, and end of media.
831 */
832 static void
readtape(char * buf)833 readtape(char *buf)
834 {
835 long rd, newvol, i;
836 int cnt, seek_failed;
837
838 if (blkcnt < numtrec) {
839 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE);
840 blksread++;
841 tapeaddr++;
842 return;
843 }
844 for (i = 0; i < ntrec; i++)
845 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
846 if (numtrec == 0)
847 numtrec = ntrec;
848 cnt = ntrec * TP_BSIZE;
849 rd = 0;
850 getmore:
851 #ifdef RRESTORE
852 if (host)
853 i = rmtread(&tapebuf[rd], cnt);
854 else
855 #endif
856 i = read(mt, &tapebuf[rd], cnt);
857 /*
858 * Check for mid-tape short read error.
859 * If found, skip rest of buffer and start with the next.
860 */
861 if (!pipein && numtrec < ntrec && i > 0) {
862 dprintf(stdout, "mid-media short read error.\n");
863 numtrec = ntrec;
864 }
865 /*
866 * Handle partial block read.
867 */
868 if (pipein && i == 0 && rd > 0)
869 i = rd;
870 else if (i > 0 && i != ntrec * TP_BSIZE) {
871 if (pipein) {
872 rd += i;
873 cnt -= i;
874 if (cnt > 0)
875 goto getmore;
876 i = rd;
877 } else {
878 /*
879 * Short read. Process the blocks read.
880 */
881 if (i % TP_BSIZE != 0)
882 vprintf(stdout,
883 "partial block read: %ld should be %ld\n",
884 i, ntrec * TP_BSIZE);
885 numtrec = i / TP_BSIZE;
886 }
887 }
888 /*
889 * Handle read error.
890 */
891 if (i < 0) {
892 fprintf(stderr, "Tape read error while ");
893 switch (curfile.action) {
894 default:
895 fprintf(stderr, "trying to set up tape\n");
896 break;
897 case UNKNOWN:
898 fprintf(stderr, "trying to resynchronize\n");
899 break;
900 case USING:
901 fprintf(stderr, "restoring %s\n", curfile.name);
902 break;
903 case SKIP:
904 fprintf(stderr, "skipping over inode %ju\n",
905 (uintmax_t)curfile.ino);
906 break;
907 }
908 if (!yflag && !reply("continue"))
909 done(1);
910 i = ntrec * TP_BSIZE;
911 memset(tapebuf, 0, i);
912 #ifdef RRESTORE
913 if (host)
914 seek_failed = (rmtseek(i, 1) < 0);
915 else
916 #endif
917 seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1);
918
919 if (seek_failed) {
920 fprintf(stderr,
921 "continuation failed: %s\n", strerror(errno));
922 done(1);
923 }
924 }
925 /*
926 * Handle end of tape.
927 */
928 if (i == 0) {
929 vprintf(stdout, "End-of-tape encountered\n");
930 if (!pipein) {
931 newvol = volno + 1;
932 volno = 0;
933 numtrec = 0;
934 getvol(newvol);
935 readtape(buf);
936 return;
937 }
938 if (rd % TP_BSIZE != 0)
939 panic("partial block read: %ld should be %ld\n",
940 rd, ntrec * TP_BSIZE);
941 terminateinput();
942 memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE);
943 }
944 blkcnt = 0;
945 memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE)], (long)TP_BSIZE);
946 blksread++;
947 tapeaddr++;
948 }
949
950 static void
findtapeblksize(void)951 findtapeblksize(void)
952 {
953 long i;
954
955 for (i = 0; i < ntrec; i++)
956 ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
957 blkcnt = 0;
958 #ifdef RRESTORE
959 if (host)
960 i = rmtread(tapebuf, ntrec * TP_BSIZE);
961 else
962 #endif
963 i = read(mt, tapebuf, ntrec * TP_BSIZE);
964
965 if (i <= 0) {
966 fprintf(stderr, "tape read error: %s\n", strerror(errno));
967 done(1);
968 }
969 if (i % TP_BSIZE != 0) {
970 fprintf(stderr, "Tape block size (%ld) %s (%d)\n",
971 i, "is not a multiple of dump block size", TP_BSIZE);
972 done(1);
973 }
974 ntrec = i / TP_BSIZE;
975 numtrec = ntrec;
976 vprintf(stdout, "Tape block size is %ld\n", ntrec);
977 }
978
979 void
closemt(void)980 closemt(void)
981 {
982
983 if (mt < 0)
984 return;
985 #ifdef RRESTORE
986 if (host)
987 rmtclose();
988 else
989 #endif
990 close(mt);
991 }
992
993 /*
994 * Read the next block from the tape.
995 * Check to see if it is one of several vintage headers.
996 * If it is an old style header, convert it to a new style header.
997 * If it is not any valid header, return an error.
998 */
999 static int
gethead(struct s_spcl * buf)1000 gethead(struct s_spcl *buf)
1001 {
1002 long i;
1003 union {
1004 quad_t qval;
1005 int32_t val[2];
1006 } qcvt;
1007 union u_ospcl {
1008 char dummy[TP_BSIZE];
1009 struct s_ospcl {
1010 int32_t c_type;
1011 int32_t c_date;
1012 int32_t c_ddate;
1013 int32_t c_volume;
1014 int32_t c_tapea;
1015 u_short c_inumber;
1016 int32_t c_magic;
1017 int32_t c_checksum;
1018 struct odinode {
1019 unsigned short odi_mode;
1020 u_short odi_nlink;
1021 u_short odi_uid;
1022 u_short odi_gid;
1023 int32_t odi_size;
1024 int32_t odi_rdev;
1025 char odi_addr[36];
1026 int32_t odi_atime;
1027 int32_t odi_mtime;
1028 int32_t odi_ctime;
1029 } c_dinode;
1030 int32_t c_count;
1031 char c_addr[256];
1032 } s_ospcl;
1033 } u_ospcl;
1034
1035 if (!cvtflag) {
1036 readtape((char *)buf);
1037 if (buf->c_magic != NFS_MAGIC) {
1038 if (swabl(buf->c_magic) != NFS_MAGIC)
1039 return (FAIL);
1040 if (!Bcvt) {
1041 vprintf(stdout, "Note: Doing Byte swapping\n");
1042 Bcvt = 1;
1043 }
1044 }
1045 if (checksum((int *)buf) == FAIL)
1046 return (FAIL);
1047 if (Bcvt) {
1048 swabst("8l4s31l", (u_char *)buf);
1049 swabst("l",(u_char *) &buf->c_level);
1050 swabst("2l",(u_char *) &buf->c_flags);
1051 }
1052 goto good;
1053 }
1054 readtape((char *)(&u_ospcl.s_ospcl));
1055 memset(buf, 0, (long)TP_BSIZE);
1056 buf->c_type = u_ospcl.s_ospcl.c_type;
1057 buf->c_date = u_ospcl.s_ospcl.c_date;
1058 buf->c_ddate = u_ospcl.s_ospcl.c_ddate;
1059 buf->c_volume = u_ospcl.s_ospcl.c_volume;
1060 buf->c_tapea = u_ospcl.s_ospcl.c_tapea;
1061 buf->c_inumber = u_ospcl.s_ospcl.c_inumber;
1062 buf->c_checksum = u_ospcl.s_ospcl.c_checksum;
1063 buf->c_magic = u_ospcl.s_ospcl.c_magic;
1064 buf->c_dinode.di_mode = u_ospcl.s_ospcl.c_dinode.odi_mode;
1065 buf->c_dinode.di_nlink = u_ospcl.s_ospcl.c_dinode.odi_nlink;
1066 buf->c_dinode.di_uid = u_ospcl.s_ospcl.c_dinode.odi_uid;
1067 buf->c_dinode.di_gid = u_ospcl.s_ospcl.c_dinode.odi_gid;
1068 buf->c_dinode.di_size = u_ospcl.s_ospcl.c_dinode.odi_size;
1069 buf->c_dinode.di_rdev = u_ospcl.s_ospcl.c_dinode.odi_rdev;
1070 buf->c_dinode.di_atime = u_ospcl.s_ospcl.c_dinode.odi_atime;
1071 buf->c_dinode.di_mtime = u_ospcl.s_ospcl.c_dinode.odi_mtime;
1072 buf->c_dinode.di_ctime = u_ospcl.s_ospcl.c_dinode.odi_ctime;
1073 buf->c_count = u_ospcl.s_ospcl.c_count;
1074 memmove(buf->c_addr, u_ospcl.s_ospcl.c_addr, (long)256);
1075 if (u_ospcl.s_ospcl.c_magic != OFS_MAGIC ||
1076 checksum((int *)(&u_ospcl.s_ospcl)) == FAIL)
1077 return(FAIL);
1078 buf->c_magic = NFS_MAGIC;
1079
1080 good:
1081 if ((buf->c_dinode.di_size == 0 || buf->c_dinode.di_size > 0xfffffff) &&
1082 (buf->c_dinode.di_mode & IFMT) == IFDIR && Qcvt == 0) {
1083 qcvt.qval = buf->c_dinode.di_size;
1084 if (qcvt.val[0] || qcvt.val[1]) {
1085 printf("Note: Doing Quad swapping\n");
1086 Qcvt = 1;
1087 }
1088 }
1089 if (Qcvt) {
1090 qcvt.qval = buf->c_dinode.di_size;
1091 i = qcvt.val[1];
1092 qcvt.val[1] = qcvt.val[0];
1093 qcvt.val[0] = i;
1094 buf->c_dinode.di_size = qcvt.qval;
1095 }
1096 readmapflag = 0;
1097
1098 switch (buf->c_type) {
1099
1100 case TS_CLRI:
1101 case TS_BITS:
1102 /*
1103 * Have to patch up missing information in bit map headers
1104 */
1105 buf->c_inumber = 0;
1106 buf->c_dinode.di_size = buf->c_count * TP_BSIZE;
1107 if (buf->c_count > TP_NINDIR)
1108 readmapflag = 1;
1109 else
1110 for (i = 0; i < buf->c_count; i++)
1111 buf->c_addr[i]++;
1112 break;
1113
1114 case TS_TAPE:
1115 if ((buf->c_flags & DR_NEWINODEFMT) == 0)
1116 oldinofmt = 1;
1117 /* fall through */
1118 case TS_END:
1119 buf->c_inumber = 0;
1120 break;
1121
1122 case TS_INODE:
1123 case TS_ADDR:
1124 break;
1125
1126 default:
1127 panic("gethead: unknown inode type %d\n", buf->c_type);
1128 break;
1129 }
1130 /*
1131 * If we are restoring a filesystem with old format inodes,
1132 * copy the uid/gid to the new location.
1133 */
1134 if (oldinofmt) {
1135 buf->c_dinode.di_uid = buf->c_dinode.di_ouid;
1136 buf->c_dinode.di_gid = buf->c_dinode.di_ogid;
1137 }
1138 tapeaddr = buf->c_tapea;
1139 if (dflag)
1140 accthdr(buf);
1141 return(GOOD);
1142 }
1143
1144 /*
1145 * Check that a header is where it belongs and predict the next header
1146 */
1147 static void
accthdr(struct s_spcl * header)1148 accthdr(struct s_spcl *header)
1149 {
1150 static ufs1_ino_t previno = 0x7fffffff;
1151 static int prevtype;
1152 static long predict;
1153 long blks, i;
1154
1155 if (header->c_type == TS_TAPE) {
1156 fprintf(stderr, "Volume header (%s inode format) ",
1157 oldinofmt ? "old" : "new");
1158 if (header->c_firstrec)
1159 fprintf(stderr, "begins with record %ld",
1160 (long)header->c_firstrec);
1161 fprintf(stderr, "\n");
1162 previno = 0x7fffffff;
1163 return;
1164 }
1165 if (previno == 0x7fffffff)
1166 goto newcalc;
1167 switch (prevtype) {
1168 case TS_BITS:
1169 fprintf(stderr, "Dumped inodes map header");
1170 break;
1171 case TS_CLRI:
1172 fprintf(stderr, "Used inodes map header");
1173 break;
1174 case TS_INODE:
1175 fprintf(stderr, "File header, ino %d", previno);
1176 break;
1177 case TS_ADDR:
1178 fprintf(stderr, "File continuation header, ino %d", previno);
1179 break;
1180 case TS_END:
1181 fprintf(stderr, "End of tape header");
1182 break;
1183 }
1184 if (predict != blksread - 1)
1185 fprintf(stderr, "; predicted %ld blocks, got %ld blocks",
1186 predict, blksread - 1);
1187 fprintf(stderr, "\n");
1188 newcalc:
1189 blks = 0;
1190 if (header->c_type != TS_END)
1191 for (i = 0; i < header->c_count; i++)
1192 if (readmapflag || header->c_addr[i] != 0)
1193 blks++;
1194 predict = blks;
1195 blksread = 0;
1196 prevtype = header->c_type;
1197 previno = header->c_inumber;
1198 }
1199
1200 /*
1201 * Find an inode header.
1202 * Complain if had to skip.
1203 */
1204 static void
findinode(struct s_spcl * header)1205 findinode(struct s_spcl *header)
1206 {
1207 static long skipcnt = 0;
1208 long i;
1209 char buf[TP_BSIZE];
1210 int htype;
1211
1212 curfile.name = "<name unknown>";
1213 curfile.action = UNKNOWN;
1214 curfile.dip = NULL;
1215 curfile.ino = 0;
1216 do {
1217 if (header->c_magic != NFS_MAGIC) {
1218 skipcnt++;
1219 while (gethead(header) == FAIL ||
1220 header->c_date != dumpdate)
1221 skipcnt++;
1222 }
1223 htype = header->c_type;
1224 switch (htype) {
1225
1226 case TS_ADDR:
1227 /*
1228 * Skip up to the beginning of the next record
1229 */
1230 for (i = 0; i < header->c_count; i++)
1231 if (header->c_addr[i])
1232 readtape(buf);
1233 while (gethead(header) == FAIL ||
1234 header->c_date != dumpdate)
1235 skipcnt++;
1236 break;
1237
1238 case TS_INODE:
1239 curfile.dip = &header->c_dinode;
1240 curfile.ino = header->c_inumber;
1241 break;
1242
1243 case TS_END:
1244 /* If we missed some tapes, get another volume. */
1245 if (tapesread & (tapesread + 1)) {
1246 getvol(0);
1247 continue;
1248 }
1249 curfile.ino = maxino;
1250 break;
1251
1252 case TS_CLRI:
1253 curfile.name = "<file removal list>";
1254 break;
1255
1256 case TS_BITS:
1257 curfile.name = "<file dump list>";
1258 break;
1259
1260 case TS_TAPE:
1261 panic("unexpected tape header\n");
1262 /* NOTREACHED */
1263 exit(1); /* hint for a compiler */
1264
1265 default:
1266 panic("unknown tape header type %d\n", spcl.c_type);
1267 /* NOTREACHED */
1268 exit(1); /* hint for a compiler */
1269
1270 }
1271 } while (htype == TS_ADDR);
1272 if (skipcnt > 0)
1273 fprintf(stderr, "resync restore, skipped %ld blocks\n",
1274 skipcnt);
1275 skipcnt = 0;
1276 }
1277
1278 static int
checksum(int * buf)1279 checksum(int *buf)
1280 {
1281 int i, j;
1282
1283 j = sizeof(union u_spcl) / sizeof(int);
1284 i = 0;
1285 if(!Bcvt) {
1286 do
1287 i += *buf++;
1288 while (--j);
1289 } else {
1290 /* What happens if we want to read restore tapes
1291 for a 16bit int machine??? */
1292 do
1293 i += swabl(*buf++);
1294 while (--j);
1295 }
1296
1297 if (i != CHECKSUM) {
1298 fprintf(stderr, "Checksum error %o, inode %d file %s\n", i,
1299 curfile.ino, curfile.name);
1300 return(FAIL);
1301 }
1302 return(GOOD);
1303 }
1304
1305 #ifdef RRESTORE
1306 #include <stdarg.h>
1307
1308 void
msg(const char * fmt,...)1309 msg(const char *fmt, ...)
1310 {
1311 va_list ap;
1312 va_start(ap, fmt);
1313 vfprintf(stderr, fmt, ap);
1314 va_end(ap);
1315 }
1316 #endif /* RRESTORE */
1317
1318 static u_char *
swabshort(u_char * sp,int n)1319 swabshort(u_char *sp, int n)
1320 {
1321 char c;
1322
1323 while (--n >= 0) {
1324 c = sp[0]; sp[0] = sp[1]; sp[1] = c;
1325 sp += 2;
1326 }
1327 return (sp);
1328 }
1329
1330 static u_char *
swablong(u_char * sp,int n)1331 swablong(u_char *sp, int n)
1332 {
1333 char c;
1334
1335 while (--n >= 0) {
1336 c = sp[0]; sp[0] = sp[3]; sp[3] = c;
1337 c = sp[2]; sp[2] = sp[1]; sp[1] = c;
1338 sp += 4;
1339 }
1340 return (sp);
1341 }
1342
1343 void
swabst(const char * cp,u_char * sp)1344 swabst(const char *cp, u_char *sp)
1345 {
1346 int n = 0;
1347
1348 while (*cp) {
1349 switch (*cp) {
1350 case '0': case '1': case '2': case '3': case '4':
1351 case '5': case '6': case '7': case '8': case '9':
1352 n = (n * 10) + (*cp++ - '0');
1353 continue;
1354
1355 case 's': case 'w': case 'h':
1356 if (n == 0)
1357 n = 1;
1358 sp = swabshort(sp, n);
1359 break;
1360
1361 case 'l':
1362 if (n == 0)
1363 n = 1;
1364 sp = swablong(sp, n);
1365 break;
1366
1367 default: /* Any other character, like 'b' counts as byte. */
1368 if (n == 0)
1369 n = 1;
1370 sp += n;
1371 break;
1372 }
1373 cp++;
1374 n = 0;
1375 }
1376 }
1377
1378 static u_long
swabl(u_long x)1379 swabl(u_long x)
1380 {
1381 swabst("l", (u_char *)&x);
1382 return (x);
1383 }
1384