xref: /freebsd/sbin/restore/tape.c (revision 2f6a179eb910129fb812c1ad1bdc300da1203dc0)
1 /*
2  * Copyright (c) 1983, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  * (c) UNIX System Laboratories, Inc.
5  * All or some portions of this file are derived from material licensed
6  * to the University of California by American Telephone and Telegraph
7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8  * the permission of UNIX System Laboratories, Inc.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 4. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #ifndef lint
36 #if 0
37 static char sccsid[] = "@(#)tape.c	8.9 (Berkeley) 5/1/95";
38 #endif
39 #endif /* not lint */
40 
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43 
44 #include <sys/param.h>
45 #include <sys/file.h>
46 #include <sys/mtio.h>
47 #include <sys/stat.h>
48 #include <sys/time.h>
49 #include <sys/extattr.h>
50 #include <sys/acl.h>
51 
52 #include <ufs/ufs/extattr.h>
53 #include <ufs/ufs/dinode.h>
54 #include <protocols/dumprestore.h>
55 
56 #include <errno.h>
57 #include <limits.h>
58 #include <paths.h>
59 #include <setjmp.h>
60 #include <stdint.h>
61 #include <stdio.h>
62 #include <stdlib.h>
63 #include <string.h>
64 #include <time.h>
65 #include <timeconv.h>
66 #include <unistd.h>
67 
68 #include "restore.h"
69 #include "extern.h"
70 
71 static long	fssize = MAXBSIZE;
72 static int	mt = -1;
73 static int	pipein = 0;
74 static int	pipecmdin = 0;
75 static FILE	*popenfp = NULL;
76 static char	*magtape;
77 static int	blkcnt;
78 static int	numtrec;
79 static char	*tapebuf;
80 static union	u_spcl endoftapemark;
81 static long	byteslide = 0;
82 static long	blksread;		/* blocks read since last header */
83 static int64_t	tapeaddr = 0;		/* current TP_BSIZE tape record */
84 static long	tapesread;
85 static jmp_buf	restart;
86 static int	gettingfile = 0;	/* restart has a valid frame */
87 static char	*host = NULL;
88 static int	readmapflag;
89 
90 static int	ofile;
91 static char	*map;
92 static char	lnkbuf[MAXPATHLEN + 1];
93 static int	pathlen;
94 
95 int		Bcvt;		/* Swap Bytes */
96 int		oldinofmt;	/* FreeBSD 1 inode format needs cvt */
97 
98 #define	FLUSHTAPEBUF()	blkcnt = ntrec + 1
99 
100 char *namespace_names[] = EXTATTR_NAMESPACE_NAMES;
101 
102 static void	 accthdr(struct s_spcl *);
103 static int	 checksum(int *);
104 static void	 findinode(struct s_spcl *);
105 static void	 findtapeblksize(void);
106 static char	*setupextattr(int);
107 static void	 xtrattr(char *, long);
108 static void	 set_extattr_link(char *, void *, int);
109 static void	 set_extattr_fd(int, char *, void *, int);
110 static int	 gethead(struct s_spcl *);
111 static void	 readtape(char *);
112 static void	 setdumpnum(void);
113 static u_long	 swabl(u_long);
114 static u_char	*swablong(u_char *, int);
115 static u_char	*swabshort(u_char *, int);
116 static void	 terminateinput(void);
117 static void	 xtrfile(char *, long);
118 static void	 xtrlnkfile(char *, long);
119 static void	 xtrlnkskip(char *, long);
120 static void	 xtrmap(char *, long);
121 static void	 xtrmapskip(char *, long);
122 static void	 xtrskip(char *, long);
123 
124 /*
125  * Set up an input source
126  */
127 void
128 setinput(char *source, int ispipecommand)
129 {
130 	FLUSHTAPEBUF();
131 	if (bflag)
132 		newtapebuf(ntrec);
133 	else
134 		newtapebuf(NTREC > HIGHDENSITYTREC ? NTREC : HIGHDENSITYTREC);
135 	terminal = stdin;
136 
137 	if (ispipecommand)
138 		pipecmdin++;
139 	else
140 #ifdef RRESTORE
141 	if (strchr(source, ':')) {
142 		host = source;
143 		source = strchr(host, ':');
144 		*source++ = '\0';
145 		if (rmthost(host) == 0)
146 			done(1);
147 	} else
148 #endif
149 	if (strcmp(source, "-") == 0) {
150 		/*
151 		 * Since input is coming from a pipe we must establish
152 		 * our own connection to the terminal.
153 		 */
154 		terminal = fopen(_PATH_TTY, "r");
155 		if (terminal == NULL) {
156 			(void)fprintf(stderr, "cannot open %s: %s\n",
157 			    _PATH_TTY, strerror(errno));
158 			terminal = fopen(_PATH_DEVNULL, "r");
159 			if (terminal == NULL) {
160 				(void)fprintf(stderr, "cannot open %s: %s\n",
161 				    _PATH_DEVNULL, strerror(errno));
162 				done(1);
163 			}
164 		}
165 		pipein++;
166 	}
167 	setuid(getuid());	/* no longer need or want root privileges */
168 	magtape = strdup(source);
169 	if (magtape == NULL) {
170 		fprintf(stderr, "Cannot allocate space for magtape buffer\n");
171 		done(1);
172 	}
173 }
174 
175 void
176 newtapebuf(long size)
177 {
178 	static int tapebufsize = -1;
179 
180 	ntrec = size;
181 	if (size <= tapebufsize)
182 		return;
183 	if (tapebuf != NULL)
184 		free(tapebuf - TP_BSIZE);
185 	tapebuf = malloc((size+1) * TP_BSIZE);
186 	if (tapebuf == NULL) {
187 		fprintf(stderr, "Cannot allocate space for tape buffer\n");
188 		done(1);
189 	}
190 	tapebuf += TP_BSIZE;
191 	tapebufsize = size;
192 }
193 
194 /*
195  * Verify that the tape drive can be accessed and
196  * that it actually is a dump tape.
197  */
198 void
199 setup(void)
200 {
201 	int i, j, *ip;
202 	struct stat stbuf;
203 
204 	vprintf(stdout, "Verify tape and initialize maps\n");
205 	if (pipecmdin) {
206 		if (setenv("RESTORE_VOLUME", "1", 1) == -1) {
207 			fprintf(stderr, "Cannot set $RESTORE_VOLUME: %s\n",
208 			    strerror(errno));
209 			done(1);
210 		}
211 		popenfp = popen(magtape, "r");
212 		mt = popenfp ? fileno(popenfp) : -1;
213 	} else
214 #ifdef RRESTORE
215 	if (host)
216 		mt = rmtopen(magtape, 0);
217 	else
218 #endif
219 	if (pipein)
220 		mt = 0;
221 	else
222 		mt = open(magtape, O_RDONLY, 0);
223 	if (mt < 0) {
224 		fprintf(stderr, "%s: %s\n", magtape, strerror(errno));
225 		done(1);
226 	}
227 	volno = 1;
228 	setdumpnum();
229 	FLUSHTAPEBUF();
230 	if (!pipein && !bflag)
231 		findtapeblksize();
232 	if (gethead(&spcl) == FAIL) {
233 		fprintf(stderr, "Tape is not a dump tape\n");
234 		done(1);
235 	}
236 	if (pipein) {
237 		endoftapemark.s_spcl.c_magic = FS_UFS2_MAGIC;
238 		endoftapemark.s_spcl.c_type = TS_END;
239 		ip = (int *)&endoftapemark;
240 		j = sizeof(union u_spcl) / sizeof(int);
241 		i = 0;
242 		do
243 			i += *ip++;
244 		while (--j);
245 		endoftapemark.s_spcl.c_checksum = CHECKSUM - i;
246 	}
247 	if (vflag || command == 't')
248 		printdumpinfo();
249 	dumptime = _time64_to_time(spcl.c_ddate);
250 	dumpdate = _time64_to_time(spcl.c_date);
251 	if (stat(".", &stbuf) < 0) {
252 		fprintf(stderr, "cannot stat .: %s\n", strerror(errno));
253 		done(1);
254 	}
255 	if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE )
256 		fssize = TP_BSIZE;
257 	if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE)
258 		fssize = stbuf.st_blksize;
259 	if (((fssize - 1) & fssize) != 0) {
260 		fprintf(stderr, "bad block size %ld\n", fssize);
261 		done(1);
262 	}
263 	if (spcl.c_volume != 1) {
264 		fprintf(stderr, "Tape is not volume 1 of the dump\n");
265 		done(1);
266 	}
267 	if (gethead(&spcl) == FAIL) {
268 		dprintf(stdout, "header read failed at %ld blocks\n", blksread);
269 		panic("no header after volume mark!\n");
270 	}
271 	findinode(&spcl);
272 	if (spcl.c_type != TS_CLRI) {
273 		fprintf(stderr, "Cannot find file removal list\n");
274 		done(1);
275 	}
276 	maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
277 	dprintf(stdout, "maxino = %d\n", maxino);
278 	map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
279 	if (map == NULL)
280 		panic("no memory for active inode map\n");
281 	usedinomap = map;
282 	curfile.action = USING;
283 	getfile(xtrmap, xtrmapskip, xtrmapskip);
284 	if (spcl.c_type != TS_BITS) {
285 		fprintf(stderr, "Cannot find file dump list\n");
286 		done(1);
287 	}
288 	map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
289 	if (map == (char *)NULL)
290 		panic("no memory for file dump list\n");
291 	dumpmap = map;
292 	curfile.action = USING;
293 	getfile(xtrmap, xtrmapskip, xtrmapskip);
294 	/*
295 	 * If there may be whiteout entries on the tape, pretend that the
296 	 * whiteout inode exists, so that the whiteout entries can be
297 	 * extracted.
298 	 */
299 	SETINO(WINO, dumpmap);
300 	/* 'r' restores don't call getvol() for tape 1, so mark it as read. */
301 	if (command == 'r')
302 		tapesread = 1;
303 }
304 
305 /*
306  * Prompt user to load a new dump volume.
307  * "Nextvol" is the next suggested volume to use.
308  * This suggested volume is enforced when doing full
309  * or incremental restores, but can be overridden by
310  * the user when only extracting a subset of the files.
311  */
312 void
313 getvol(long nextvol)
314 {
315 	int64_t prevtapea;
316 	long i, newvol, savecnt;
317 	union u_spcl tmpspcl;
318 #	define tmpbuf tmpspcl.s_spcl
319 	char buf[TP_BSIZE];
320 
321 	if (nextvol == 1) {
322 		tapesread = 0;
323 		gettingfile = 0;
324 	}
325 	prevtapea = tapeaddr;
326 	savecnt = blksread;
327 	if (pipein) {
328 		if (nextvol != 1) {
329 			panic("Changing volumes on pipe input?\n");
330 			/* Avoid looping if we couldn't ask the user. */
331 			if (yflag || ferror(terminal) || feof(terminal))
332 				done(1);
333 		}
334 		if (volno == 1)
335 			return;
336 		if (pipecmdin) {
337 			closemt();
338 			goto getpipecmdhdr;
339 		}
340 		goto gethdr;
341 	}
342 again:
343 	if (pipein)
344 		done(1); /* pipes do not get a second chance */
345 	if (command == 'R' || command == 'r' || curfile.action != SKIP)
346 		newvol = nextvol;
347 	else
348 		newvol = 0;
349 	while (newvol <= 0) {
350 		if (tapesread == 0) {
351 			fprintf(stderr, "%s%s%s%s%s%s%s",
352 			    "You have not read any tapes yet.\n",
353 			    "If you are extracting just a few files,",
354 			    " start with the last volume\n",
355 			    "and work towards the first; restore",
356 			    " can quickly skip tapes that\n",
357 			    "have no further files to extract.",
358 			    " Otherwise, begin with volume 1.\n");
359 		} else {
360 			fprintf(stderr, "You have read volumes");
361 			strcpy(buf, ": ");
362 			for (i = 0; i < 32; i++)
363 				if (tapesread & (1 << i)) {
364 					fprintf(stderr, "%s%ld", buf, i + 1);
365 					strcpy(buf, ", ");
366 				}
367 			fprintf(stderr, "\n");
368 		}
369 		do	{
370 			fprintf(stderr, "Specify next volume #: ");
371 			(void) fflush(stderr);
372 			if (fgets(buf, BUFSIZ, terminal) == NULL)
373 				done(1);
374 		} while (buf[0] == '\n');
375 		newvol = atoi(buf);
376 		if (newvol <= 0) {
377 			fprintf(stderr,
378 			    "Volume numbers are positive numerics\n");
379 		}
380 	}
381 	if (newvol == volno) {
382 		tapesread |= 1 << (volno - 1);
383 		return;
384 	}
385 	closemt();
386 	fprintf(stderr, "Mount tape volume %ld\n", newvol);
387 	fprintf(stderr, "Enter ``none'' if there are no more tapes\n");
388 	fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape);
389 	(void) fflush(stderr);
390 	if (fgets(buf, BUFSIZ, terminal) == NULL)
391 		done(1);
392 	if (!strcmp(buf, "none\n")) {
393 		terminateinput();
394 		return;
395 	}
396 	if (buf[0] != '\n') {
397 		(void) strcpy(magtape, buf);
398 		magtape[strlen(magtape) - 1] = '\0';
399 	}
400 	if (pipecmdin) {
401 		char volno[sizeof("2147483647")];
402 
403 getpipecmdhdr:
404 		(void)sprintf(volno, "%d", newvol);
405 		if (setenv("RESTORE_VOLUME", volno, 1) == -1) {
406 			fprintf(stderr, "Cannot set $RESTORE_VOLUME: %s\n",
407 			    strerror(errno));
408 			done(1);
409 		}
410 		popenfp = popen(magtape, "r");
411 		mt = popenfp ? fileno(popenfp) : -1;
412 	} else
413 #ifdef RRESTORE
414 	if (host)
415 		mt = rmtopen(magtape, 0);
416 	else
417 #endif
418 		mt = open(magtape, O_RDONLY, 0);
419 
420 	if (mt == -1) {
421 		fprintf(stderr, "Cannot open %s\n", magtape);
422 		volno = -1;
423 		goto again;
424 	}
425 gethdr:
426 	volno = newvol;
427 	setdumpnum();
428 	FLUSHTAPEBUF();
429 	if (gethead(&tmpbuf) == FAIL) {
430 		dprintf(stdout, "header read failed at %ld blocks\n", blksread);
431 		fprintf(stderr, "tape is not dump tape\n");
432 		volno = 0;
433 		goto again;
434 	}
435 	if (tmpbuf.c_volume != volno) {
436 		fprintf(stderr, "Wrong volume (%ld)\n", tmpbuf.c_volume);
437 		volno = 0;
438 		goto again;
439 	}
440 	if (_time64_to_time(tmpbuf.c_date) != dumpdate ||
441 	    _time64_to_time(tmpbuf.c_ddate) != dumptime) {
442 		time_t t = _time64_to_time(tmpbuf.c_date);
443 		fprintf(stderr, "Wrong dump date\n\tgot: %s", ctime(&t));
444 		fprintf(stderr, "\twanted: %s", ctime(&dumpdate));
445 		volno = 0;
446 		goto again;
447 	}
448 	tapesread |= 1 << (volno - 1);
449 	blksread = savecnt;
450  	/*
451  	 * If continuing from the previous volume, skip over any
452  	 * blocks read already at the end of the previous volume.
453  	 *
454  	 * If coming to this volume at random, skip to the beginning
455  	 * of the next record.
456  	 */
457 	dprintf(stdout, "last rec %qd, tape starts with %qd\n", prevtapea,
458 	    tmpbuf.c_tapea);
459  	if (tmpbuf.c_type == TS_TAPE) {
460  		if (curfile.action != USING) {
461 			/*
462 			 * XXX Dump incorrectly sets c_count to 1 in the
463 			 * volume header of the first tape, so ignore
464 			 * c_count when volno == 1.
465 			 */
466 			if (volno != 1)
467 				for (i = tmpbuf.c_count; i > 0; i--)
468 					readtape(buf);
469  		} else if (tmpbuf.c_tapea <= prevtapea) {
470 			/*
471 			 * Normally the value of c_tapea in the volume
472 			 * header is the record number of the header itself.
473 			 * However in the volume header following an EOT-
474 			 * terminated tape, it is the record number of the
475 			 * first continuation data block (dump bug?).
476 			 *
477 			 * The next record we want is `prevtapea + 1'.
478 			 */
479  			i = prevtapea + 1 - tmpbuf.c_tapea;
480 			dprintf(stderr, "Skipping %ld duplicate record%s.\n",
481 				i, i > 1 ? "s" : "");
482  			while (--i >= 0)
483  				readtape(buf);
484  		}
485  	}
486 	if (curfile.action == USING) {
487 		if (volno == 1)
488 			panic("active file into volume 1\n");
489 		return;
490 	}
491 	(void) gethead(&spcl);
492 	findinode(&spcl);
493 	if (gettingfile) {
494 		gettingfile = 0;
495 		longjmp(restart, 1);
496 	}
497 }
498 
499 /*
500  * Handle unexpected EOF.
501  */
502 static void
503 terminateinput(void)
504 {
505 
506 	if (gettingfile && curfile.action == USING) {
507 		printf("Warning: %s %s\n",
508 		    "End-of-input encountered while extracting", curfile.name);
509 	}
510 	curfile.name = "<name unknown>";
511 	curfile.action = UNKNOWN;
512 	curfile.mode = 0;
513 	curfile.ino = maxino;
514 	if (gettingfile) {
515 		gettingfile = 0;
516 		longjmp(restart, 1);
517 	}
518 }
519 
520 /*
521  * handle multiple dumps per tape by skipping forward to the
522  * appropriate one.
523  */
524 static void
525 setdumpnum(void)
526 {
527 	struct mtop tcom;
528 
529 	if (dumpnum == 1 || volno != 1)
530 		return;
531 	if (pipein) {
532 		fprintf(stderr, "Cannot have multiple dumps on pipe input\n");
533 		done(1);
534 	}
535 	tcom.mt_op = MTFSF;
536 	tcom.mt_count = dumpnum - 1;
537 #ifdef RRESTORE
538 	if (host)
539 		rmtioctl(MTFSF, dumpnum - 1);
540 	else
541 #endif
542 		if (!pipecmdin && ioctl(mt, MTIOCTOP, (char *)&tcom) < 0)
543 			fprintf(stderr, "ioctl MTFSF: %s\n", strerror(errno));
544 }
545 
546 void
547 printdumpinfo(void)
548 {
549 	time_t t;
550 	t = _time64_to_time(spcl.c_date);
551 	fprintf(stdout, "Dump   date: %s", ctime(&t));
552 	t = _time64_to_time(spcl.c_ddate);
553 	fprintf(stdout, "Dumped from: %s",
554 	    (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&t));
555 	if (spcl.c_host[0] == '\0')
556 		return;
557 	fprintf(stderr, "Level %ld dump of %s on %s:%s\n",
558 		spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev);
559 	fprintf(stderr, "Label: %s\n", spcl.c_label);
560 }
561 
562 int
563 extractfile(char *name)
564 {
565 	int flags;
566 	uid_t uid;
567 	gid_t gid;
568 	mode_t mode;
569 	int extsize;
570 	struct timeval mtimep[2], ctimep[2];
571 	struct entry *ep;
572 	char *buf;
573 
574 	curfile.name = name;
575 	curfile.action = USING;
576 	mtimep[0].tv_sec = curfile.atime_sec;
577 	mtimep[0].tv_usec = curfile.atime_nsec / 1000;
578 	mtimep[1].tv_sec = curfile.mtime_sec;
579 	mtimep[1].tv_usec = curfile.mtime_nsec / 1000;
580 	ctimep[0].tv_sec = curfile.atime_sec;
581 	ctimep[0].tv_usec = curfile.atime_nsec / 1000;
582 	ctimep[1].tv_sec = curfile.birthtime_sec;
583 	ctimep[1].tv_usec = curfile.birthtime_nsec / 1000;
584 	extsize = curfile.extsize;
585 	uid = getuid();
586 	if (uid == 0)
587 		uid = curfile.uid;
588 	gid = curfile.gid;
589 	mode = curfile.mode;
590 	flags = curfile.file_flags;
591 	switch (mode & IFMT) {
592 
593 	default:
594 		fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode);
595 		skipfile();
596 		return (FAIL);
597 
598 	case IFSOCK:
599 		vprintf(stdout, "skipped socket %s\n", name);
600 		skipfile();
601 		return (GOOD);
602 
603 	case IFDIR:
604 		if (mflag) {
605 			ep = lookupname(name);
606 			if (ep == NULL || ep->e_flags & EXTRACT)
607 				panic("unextracted directory %s\n", name);
608 			skipfile();
609 			return (GOOD);
610 		}
611 		vprintf(stdout, "extract file %s\n", name);
612 		return (genliteraldir(name, curfile.ino));
613 
614 	case IFLNK:
615 		lnkbuf[0] = '\0';
616 		pathlen = 0;
617 		buf = setupextattr(extsize);
618 		getfile(xtrlnkfile, xtrattr, xtrlnkskip);
619 		if (pathlen == 0) {
620 			vprintf(stdout,
621 			    "%s: zero length symbolic link (ignored)\n", name);
622 			return (GOOD);
623 		}
624 		if (linkit(lnkbuf, name, SYMLINK) == GOOD) {
625 			if (extsize > 0)
626 				set_extattr_link(name, buf, extsize);
627 			(void) lchown(name, uid, gid);
628 			(void) lchmod(name, mode);
629 			(void) lutimes(name, ctimep);
630 			(void) lutimes(name, mtimep);
631 			(void) lchflags(name, flags);
632 			return (GOOD);
633 		}
634 		return (FAIL);
635 
636 	case IFIFO:
637 		vprintf(stdout, "extract fifo %s\n", name);
638 		if (Nflag) {
639 			skipfile();
640 			return (GOOD);
641 		}
642 		if (uflag)
643 			(void) unlink(name);
644 		if (mkfifo(name, 0600) < 0) {
645 			fprintf(stderr, "%s: cannot create fifo: %s\n",
646 			    name, strerror(errno));
647 			skipfile();
648 			return (FAIL);
649 		}
650 		if (extsize == 0) {
651 			skipfile();
652 		} else {
653 			buf = setupextattr(extsize);
654 			getfile(xtrnull, xtrattr, xtrnull);
655 			set_extattr_file(name, buf, extsize);
656 		}
657 		(void) chown(name, uid, gid);
658 		(void) chmod(name, mode);
659 		(void) utimes(name, ctimep);
660 		(void) utimes(name, mtimep);
661 		(void) chflags(name, flags);
662 		return (GOOD);
663 
664 	case IFCHR:
665 	case IFBLK:
666 		vprintf(stdout, "extract special file %s\n", name);
667 		if (Nflag) {
668 			skipfile();
669 			return (GOOD);
670 		}
671 		if (uflag)
672 			(void) unlink(name);
673 		if (mknod(name, (mode & (IFCHR | IFBLK)) | 0600,
674 		    (int)curfile.rdev) < 0) {
675 			fprintf(stderr, "%s: cannot create special file: %s\n",
676 			    name, strerror(errno));
677 			skipfile();
678 			return (FAIL);
679 		}
680 		if (extsize == 0) {
681 			skipfile();
682 		} else {
683 			buf = setupextattr(extsize);
684 			getfile(xtrnull, xtrattr, xtrnull);
685 			set_extattr_file(name, buf, extsize);
686 		}
687 		(void) chown(name, uid, gid);
688 		(void) chmod(name, mode);
689 		(void) utimes(name, ctimep);
690 		(void) utimes(name, mtimep);
691 		(void) chflags(name, flags);
692 		return (GOOD);
693 
694 	case IFREG:
695 		vprintf(stdout, "extract file %s\n", name);
696 		if (Nflag) {
697 			skipfile();
698 			return (GOOD);
699 		}
700 		if (uflag)
701 			(void) unlink(name);
702 		if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC,
703 		    0600)) < 0) {
704 			fprintf(stderr, "%s: cannot create file: %s\n",
705 			    name, strerror(errno));
706 			skipfile();
707 			return (FAIL);
708 		}
709 		buf = setupextattr(extsize);
710 		getfile(xtrfile, xtrattr, xtrskip);
711 		if (extsize > 0)
712 			set_extattr_fd(ofile, name, buf, extsize);
713 		(void) fchown(ofile, uid, gid);
714 		(void) fchmod(ofile, mode);
715 		(void) futimes(ofile, ctimep);
716 		(void) futimes(ofile, mtimep);
717 		(void) fchflags(ofile, flags);
718 		(void) close(ofile);
719 		return (GOOD);
720 	}
721 	/* NOTREACHED */
722 }
723 
724 /*
725  * Set attributes for a file.
726  */
727 void
728 set_extattr_file(char *name, void *buf, int size)
729 {
730 	struct extattr *eap, *eaend;
731 
732 	vprintf(stdout, "Set attributes for %s:", name);
733 	eaend = buf + size;
734 	for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
735 		/*
736 		 * Make sure this entry is complete.
737 		 */
738 		if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
739 			dprintf(stdout, "\n\t%scorrupted",
740 				eap == buf ? "" : "remainder ");
741 			break;
742 		}
743 		if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
744 			continue;
745 		vprintf(stdout, "\n\t%s, (%d bytes), %*s",
746 			namespace_names[eap->ea_namespace], eap->ea_length,
747 			eap->ea_namelength, eap->ea_name);
748 		/*
749 		 * First we try the general attribute setting interface.
750 		 * However, some attributes can only be set by root or
751 		 * by using special interfaces (for example, ACLs).
752 		 */
753 		if (extattr_set_file(name, eap->ea_namespace, eap->ea_name,
754 		    EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
755 			dprintf(stdout, " (set using extattr_set_file)");
756 			continue;
757 		}
758 		/*
759 		 * If the general interface refuses to set the attribute,
760 		 * then we try all the specialized interfaces that we
761 		 * know about.
762 		 */
763 		if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
764 		    !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
765 			if (acl_set_file(name, ACL_TYPE_ACCESS,
766 			    EXTATTR_CONTENT(eap)) != -1) {
767 				dprintf(stdout, " (set using acl_set_file)");
768 				continue;
769 			}
770 		}
771 		if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
772 		    !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
773 			if (acl_set_file(name, ACL_TYPE_DEFAULT,
774 			    EXTATTR_CONTENT(eap)) != -1) {
775 				dprintf(stdout, " (set using acl_set_file)");
776 				continue;
777 			}
778 		}
779 		vprintf(stdout, " (unable to set)");
780 	}
781 	vprintf(stdout, "\n");
782 }
783 
784 /*
785  * Set attributes for a symbolic link.
786  */
787 static void
788 set_extattr_link(char *name, void *buf, int size)
789 {
790 	struct extattr *eap, *eaend;
791 
792 	vprintf(stdout, "Set attributes for %s:", name);
793 	eaend = buf + size;
794 	for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
795 		/*
796 		 * Make sure this entry is complete.
797 		 */
798 		if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
799 			dprintf(stdout, "\n\t%scorrupted",
800 				eap == buf ? "" : "remainder ");
801 			break;
802 		}
803 		if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
804 			continue;
805 		vprintf(stdout, "\n\t%s, (%d bytes), %*s",
806 			namespace_names[eap->ea_namespace], eap->ea_length,
807 			eap->ea_namelength, eap->ea_name);
808 		/*
809 		 * First we try the general attribute setting interface.
810 		 * However, some attributes can only be set by root or
811 		 * by using special interfaces (for example, ACLs).
812 		 */
813 		if (extattr_set_link(name, eap->ea_namespace, eap->ea_name,
814 		    EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
815 			dprintf(stdout, " (set using extattr_set_link)");
816 			continue;
817 		}
818 		/*
819 		 * If the general interface refuses to set the attribute,
820 		 * then we try all the specialized interfaces that we
821 		 * know about.
822 		 */
823 		if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
824 		    !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
825 			if (acl_set_link_np(name, ACL_TYPE_ACCESS,
826 			    EXTATTR_CONTENT(eap)) != -1) {
827 				dprintf(stdout, " (set using acl_set_link_np)");
828 				continue;
829 			}
830 		}
831 		if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
832 		    !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
833 			if (acl_set_link_np(name, ACL_TYPE_DEFAULT,
834 			    EXTATTR_CONTENT(eap)) != -1) {
835 				dprintf(stdout, " (set using acl_set_link_np)");
836 				continue;
837 			}
838 		}
839 		vprintf(stdout, " (unable to set)");
840 	}
841 	vprintf(stdout, "\n");
842 }
843 
844 /*
845  * Set attributes on a file descriptor.
846  */
847 static void
848 set_extattr_fd(int fd, char *name, void *buf, int size)
849 {
850 	struct extattr *eap, *eaend;
851 
852 	vprintf(stdout, "Set attributes for %s:", name);
853 	eaend = buf + size;
854 	for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
855 		/*
856 		 * Make sure this entry is complete.
857 		 */
858 		if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
859 			dprintf(stdout, "\n\t%scorrupted",
860 				eap == buf ? "" : "remainder ");
861 			break;
862 		}
863 		if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
864 			continue;
865 		vprintf(stdout, "\n\t%s, (%d bytes), %*s",
866 			namespace_names[eap->ea_namespace], eap->ea_length,
867 			eap->ea_namelength, eap->ea_name);
868 		/*
869 		 * First we try the general attribute setting interface.
870 		 * However, some attributes can only be set by root or
871 		 * by using special interfaces (for example, ACLs).
872 		 */
873 		if (extattr_set_fd(fd, eap->ea_namespace, eap->ea_name,
874 		    EXTATTR_CONTENT(eap), EXTATTR_CONTENT_SIZE(eap)) != -1) {
875 			dprintf(stdout, " (set using extattr_set_fd)");
876 			continue;
877 		}
878 		/*
879 		 * If the general interface refuses to set the attribute,
880 		 * then we try all the specialized interfaces that we
881 		 * know about.
882 		 */
883 		if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
884 		    !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME)) {
885 			if (acl_set_fd(fd, EXTATTR_CONTENT(eap)) != -1) {
886 				dprintf(stdout, " (set using acl_set_fd)");
887 				continue;
888 			}
889 		}
890 		if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
891 		    !strcmp(eap->ea_name, POSIX1E_ACL_DEFAULT_EXTATTR_NAME)) {
892 			if (acl_set_file(name, ACL_TYPE_DEFAULT,
893 			    EXTATTR_CONTENT(eap)) != -1) {
894 				dprintf(stdout, " (set using acl_set_file)");
895 				continue;
896 			}
897 		}
898 		vprintf(stdout, " (unable to set)");
899 	}
900 	vprintf(stdout, "\n");
901 }
902 
903 /*
904  * skip over bit maps on the tape
905  */
906 void
907 skipmaps(void)
908 {
909 
910 	while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI)
911 		skipfile();
912 }
913 
914 /*
915  * skip over a file on the tape
916  */
917 void
918 skipfile(void)
919 {
920 
921 	curfile.action = SKIP;
922 	getfile(xtrnull, xtrnull, xtrnull);
923 }
924 
925 /*
926  * Extract a file from the tape.
927  * When an allocated block is found it is passed to the fill function;
928  * when an unallocated block (hole) is found, a zeroed buffer is passed
929  * to the skip function.
930  */
931 void
932 getfile(void (*datafill)(char *, long), void (*attrfill)(char *, long),
933 	void (*skip)(char *, long))
934 {
935 	int i;
936 	off_t size;
937 	int curblk, attrsize;
938 	void (*fillit)(char *, long);
939 	static char clearedbuf[MAXBSIZE];
940 	char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
941 	char junk[TP_BSIZE];
942 
943 	curblk = 0;
944 	size = spcl.c_size;
945 	attrsize = spcl.c_extsize;
946 	if (spcl.c_type == TS_END)
947 		panic("ran off end of tape\n");
948 	if (spcl.c_magic != FS_UFS2_MAGIC)
949 		panic("not at beginning of a file\n");
950 	if (!gettingfile && setjmp(restart) != 0)
951 		return;
952 	gettingfile++;
953 	fillit = datafill;
954 	if (size == 0 && attrsize > 0) {
955 		fillit = attrfill;
956 		size = attrsize;
957 		attrsize = 0;
958 	}
959 loop:
960 	for (i = 0; i < spcl.c_count; i++) {
961 		if (!readmapflag && i > TP_NINDIR) {
962 			if (Dflag) {
963 				fprintf(stderr, "spcl.c_count = %jd\n",
964 				    (intmax_t)spcl.c_count);
965 				break;
966 			} else
967 				panic("spcl.c_count = %jd\n",
968 				    (intmax_t)spcl.c_count);
969 		}
970 		if (readmapflag || spcl.c_addr[i]) {
971 			readtape(&buf[curblk++][0]);
972 			if (curblk == fssize / TP_BSIZE) {
973 				(*fillit)((char *)buf, (long)(size > TP_BSIZE ?
974 				     fssize : (curblk - 1) * TP_BSIZE + size));
975 				curblk = 0;
976 			}
977 		} else {
978 			if (curblk > 0) {
979 				(*fillit)((char *)buf, (long)(size > TP_BSIZE ?
980 				     curblk * TP_BSIZE :
981 				     (curblk - 1) * TP_BSIZE + size));
982 				curblk = 0;
983 			}
984 			(*skip)(clearedbuf, (long)(size > TP_BSIZE ?
985 				TP_BSIZE : size));
986 		}
987 		if ((size -= TP_BSIZE) <= 0) {
988 			if (size > -TP_BSIZE && curblk > 0) {
989 				(*fillit)((char *)buf,
990 					(long)((curblk * TP_BSIZE) + size));
991 				curblk = 0;
992 			}
993 			if (attrsize > 0) {
994 				fillit = attrfill;
995 				size = attrsize;
996 				attrsize = 0;
997 				continue;
998 			}
999 			if (spcl.c_count - i > 1)
1000 				dprintf(stdout, "skipping %d junk block(s)\n",
1001 					spcl.c_count - i - 1);
1002 			for (i++; i < spcl.c_count; i++) {
1003 				if (!readmapflag && i > TP_NINDIR) {
1004 					if (Dflag) {
1005 						fprintf(stderr,
1006 						    "spcl.c_count = %jd\n",
1007 						    (intmax_t)spcl.c_count);
1008 						break;
1009 					} else
1010 						panic("spcl.c_count = %jd\n",
1011 						    (intmax_t)spcl.c_count);
1012 				}
1013 				if (readmapflag || spcl.c_addr[i])
1014 					readtape(junk);
1015 			}
1016 			break;
1017 		}
1018 	}
1019 	if (gethead(&spcl) == GOOD && size > 0) {
1020 		if (spcl.c_type == TS_ADDR)
1021 			goto loop;
1022 		dprintf(stdout,
1023 			"Missing address (header) block for %s at %ld blocks\n",
1024 			curfile.name, blksread);
1025 	}
1026 	if (curblk > 0)
1027 		panic("getfile: lost data\n");
1028 	findinode(&spcl);
1029 	gettingfile = 0;
1030 }
1031 
1032 /*
1033  * These variables are shared between the next two functions.
1034  */
1035 static int extbufsize = 0;
1036 static char *extbuf;
1037 static int extloc;
1038 
1039 /*
1040  * Allocate a buffer into which to extract extended attributes.
1041  */
1042 static char *
1043 setupextattr(int extsize)
1044 {
1045 
1046 	extloc = 0;
1047 	if (extsize <= extbufsize)
1048 		return (extbuf);
1049 	if (extbufsize > 0)
1050 		free(extbuf);
1051 	if ((extbuf = malloc(extsize)) != NULL) {
1052 		extbufsize = extsize;
1053 		return (extbuf);
1054 	}
1055 	extbufsize = 0;
1056 	extbuf = NULL;
1057 	fprintf(stderr, "Cannot extract %d bytes %s for inode %d, name %s\n",
1058 	    extsize, "of extended attributes", curfile.ino, curfile.name);
1059 	return (NULL);
1060 }
1061 
1062 /*
1063  * Extract the next block of extended attributes.
1064  */
1065 static void
1066 xtrattr(char *buf, long size)
1067 {
1068 
1069 	if (extloc + size > extbufsize)
1070 		panic("overrun attribute buffer\n");
1071 	memmove(&extbuf[extloc], buf, size);
1072 	extloc += size;
1073 }
1074 
1075 /*
1076  * Write out the next block of a file.
1077  */
1078 static void
1079 xtrfile(char *buf, long	size)
1080 {
1081 
1082 	if (Nflag)
1083 		return;
1084 	if (write(ofile, buf, (int) size) == -1) {
1085 		fprintf(stderr,
1086 		    "write error extracting inode %d, name %s\nwrite: %s\n",
1087 			curfile.ino, curfile.name, strerror(errno));
1088 	}
1089 }
1090 
1091 /*
1092  * Skip over a hole in a file.
1093  */
1094 /* ARGSUSED */
1095 static void
1096 xtrskip(char *buf, long size)
1097 {
1098 
1099 	if (lseek(ofile, size, SEEK_CUR) == -1) {
1100 		fprintf(stderr,
1101 		    "seek error extracting inode %d, name %s\nlseek: %s\n",
1102 			curfile.ino, curfile.name, strerror(errno));
1103 		done(1);
1104 	}
1105 }
1106 
1107 /*
1108  * Collect the next block of a symbolic link.
1109  */
1110 static void
1111 xtrlnkfile(char *buf, long size)
1112 {
1113 
1114 	pathlen += size;
1115 	if (pathlen > MAXPATHLEN) {
1116 		fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n",
1117 		    curfile.name, lnkbuf, buf, pathlen);
1118 		done(1);
1119 	}
1120 	(void) strcat(lnkbuf, buf);
1121 }
1122 
1123 /*
1124  * Skip over a hole in a symbolic link (should never happen).
1125  */
1126 /* ARGSUSED */
1127 static void
1128 xtrlnkskip(char *buf, long size)
1129 {
1130 
1131 	fprintf(stderr, "unallocated block in symbolic link %s\n",
1132 		curfile.name);
1133 	done(1);
1134 }
1135 
1136 /*
1137  * Collect the next block of a bit map.
1138  */
1139 static void
1140 xtrmap(char *buf, long size)
1141 {
1142 
1143 	memmove(map, buf, size);
1144 	map += size;
1145 }
1146 
1147 /*
1148  * Skip over a hole in a bit map (should never happen).
1149  */
1150 /* ARGSUSED */
1151 static void
1152 xtrmapskip(char *buf, long size)
1153 {
1154 
1155 	panic("hole in map\n");
1156 	map += size;
1157 }
1158 
1159 /*
1160  * Noop, when an extraction function is not needed.
1161  */
1162 /* ARGSUSED */
1163 void
1164 xtrnull(char *buf, long size)
1165 {
1166 
1167 	return;
1168 }
1169 
1170 /*
1171  * Read TP_BSIZE blocks from the input.
1172  * Handle read errors, and end of media.
1173  */
1174 static void
1175 readtape(char *buf)
1176 {
1177 	long rd, newvol, i, oldnumtrec;
1178 	int cnt, seek_failed;
1179 
1180 	if (blkcnt + (byteslide > 0) < numtrec) {
1181 		memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE) + byteslide], (long)TP_BSIZE);
1182 		blksread++;
1183 		tapeaddr++;
1184 		return;
1185 	}
1186 	if (numtrec > 0)
1187 		memmove(&tapebuf[-TP_BSIZE],
1188 		    &tapebuf[(numtrec-1) * TP_BSIZE], (long)TP_BSIZE);
1189 	oldnumtrec = numtrec;
1190 	for (i = 0; i < ntrec; i++)
1191 		((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
1192 	if (numtrec == 0)
1193 		numtrec = ntrec;
1194 	cnt = ntrec * TP_BSIZE;
1195 	rd = 0;
1196 getmore:
1197 #ifdef RRESTORE
1198 	if (host)
1199 		i = rmtread(&tapebuf[rd], cnt);
1200 	else
1201 #endif
1202 		i = read(mt, &tapebuf[rd], cnt);
1203 	/*
1204 	 * Check for mid-tape short read error.
1205 	 * If found, skip rest of buffer and start with the next.
1206 	 */
1207 	if (!pipein && numtrec < ntrec && i > 0) {
1208 		dprintf(stdout, "mid-media short read error.\n");
1209 		numtrec = ntrec;
1210 	}
1211 	/*
1212 	 * Handle partial block read.
1213 	 */
1214 	if (pipein && i == 0 && rd > 0)
1215 		i = rd;
1216 	else if (i > 0 && i != ntrec * TP_BSIZE) {
1217 		if (pipein) {
1218 			rd += i;
1219 			cnt -= i;
1220 			if (cnt > 0)
1221 				goto getmore;
1222 			i = rd;
1223 		} else {
1224 			/*
1225 			 * Short read. Process the blocks read.
1226 			 */
1227 			if (i % TP_BSIZE != 0)
1228 				vprintf(stdout,
1229 				    "partial block read: %ld should be %ld\n",
1230 				    i, ntrec * TP_BSIZE);
1231 			numtrec = i / TP_BSIZE;
1232 		}
1233 	}
1234 	/*
1235 	 * Handle read error.
1236 	 */
1237 	if (i < 0) {
1238 		fprintf(stderr, "Tape read error while ");
1239 		switch (curfile.action) {
1240 		default:
1241 			fprintf(stderr, "trying to set up tape\n");
1242 			break;
1243 		case UNKNOWN:
1244 			fprintf(stderr, "trying to resynchronize\n");
1245 			break;
1246 		case USING:
1247 			fprintf(stderr, "restoring %s\n", curfile.name);
1248 			break;
1249 		case SKIP:
1250 			fprintf(stderr, "skipping over inode %d\n",
1251 				curfile.ino);
1252 			break;
1253 		}
1254 		if (!yflag && !reply("continue"))
1255 			done(1);
1256 		i = ntrec * TP_BSIZE;
1257 		memset(tapebuf, 0, i);
1258 #ifdef RRESTORE
1259 		if (host)
1260 			seek_failed = (rmtseek(i, 1) < 0);
1261 		else
1262 #endif
1263 			seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1);
1264 
1265 		if (seek_failed) {
1266 			fprintf(stderr,
1267 			    "continuation failed: %s\n", strerror(errno));
1268 			done(1);
1269 		}
1270 	}
1271 	/*
1272 	 * Handle end of tape.
1273 	 */
1274 	if (i == 0) {
1275 		vprintf(stdout, "End-of-tape encountered\n");
1276 		if (!pipein) {
1277 			newvol = volno + 1;
1278 			volno = 0;
1279 			numtrec = 0;
1280 			getvol(newvol);
1281 			readtape(buf);
1282 			return;
1283 		}
1284 		if (rd % TP_BSIZE != 0)
1285 			panic("partial block read: %d should be %d\n",
1286 				rd, ntrec * TP_BSIZE);
1287 		terminateinput();
1288 		memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE);
1289 	}
1290 	if (oldnumtrec == 0)
1291 		blkcnt = 0;
1292 	else
1293 		blkcnt -= oldnumtrec;
1294 	memmove(buf,
1295 	    &tapebuf[(blkcnt++ * TP_BSIZE) + byteslide], (long)TP_BSIZE);
1296 	blksread++;
1297 	tapeaddr++;
1298 }
1299 
1300 static void
1301 findtapeblksize(void)
1302 {
1303 	long i;
1304 
1305 	for (i = 0; i < ntrec; i++)
1306 		((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
1307 	blkcnt = 0;
1308 #ifdef RRESTORE
1309 	if (host)
1310 		i = rmtread(tapebuf, ntrec * TP_BSIZE);
1311 	else
1312 #endif
1313 		i = read(mt, tapebuf, ntrec * TP_BSIZE);
1314 
1315 	if (i <= 0) {
1316 		fprintf(stderr, "tape read error: %s\n", strerror(errno));
1317 		done(1);
1318 	}
1319 	if (i % TP_BSIZE != 0) {
1320 		fprintf(stderr, "Tape block size (%ld) %s (%d)\n",
1321 			i, "is not a multiple of dump block size", TP_BSIZE);
1322 		done(1);
1323 	}
1324 	ntrec = i / TP_BSIZE;
1325 	numtrec = ntrec;
1326 	vprintf(stdout, "Tape block size is %ld\n", ntrec);
1327 }
1328 
1329 void
1330 closemt(void)
1331 {
1332 
1333 	if (mt < 0)
1334 		return;
1335 	if (pipecmdin) {
1336 		pclose(popenfp);
1337 		popenfp = NULL;
1338 	} else
1339 #ifdef RRESTORE
1340 	if (host)
1341 		rmtclose();
1342 	else
1343 #endif
1344 		(void) close(mt);
1345 }
1346 
1347 /*
1348  * Read the next block from the tape.
1349  * If it is not any valid header, return an error.
1350  */
1351 static int
1352 gethead(struct s_spcl *buf)
1353 {
1354 	long i;
1355 
1356 	readtape((char *)buf);
1357 	if (buf->c_magic != FS_UFS2_MAGIC && buf->c_magic != NFS_MAGIC) {
1358 		if (buf->c_magic == OFS_MAGIC) {
1359 			fprintf(stderr,
1360 			    "Format of dump tape is too old. Must use\n");
1361 			fprintf(stderr,
1362 			    "a version of restore from before 2002.\n");
1363 			return (FAIL);
1364 		}
1365 		if (swabl(buf->c_magic) != FS_UFS2_MAGIC &&
1366 		    buf->c_magic != NFS_MAGIC) {
1367 			if (buf->c_magic == OFS_MAGIC) {
1368 				fprintf(stderr,
1369 				  "Format of dump tape is too old. Must use\n");
1370 				fprintf(stderr,
1371 				  "a version of restore from before 2002.\n");
1372 			}
1373 			return (FAIL);
1374 		}
1375 		if (!Bcvt) {
1376 			vprintf(stdout, "Note: Doing Byte swapping\n");
1377 			Bcvt = 1;
1378 		}
1379 	}
1380 	if (checksum((int *)buf) == FAIL)
1381 		return (FAIL);
1382 	if (Bcvt) {
1383 		swabst((u_char *)"8l4s1q8l2q17l", (u_char *)buf);
1384 		swabst((u_char *)"l",(u_char *) &buf->c_level);
1385 		swabst((u_char *)"2l4q",(u_char *) &buf->c_flags);
1386 	}
1387 	readmapflag = 0;
1388 
1389 	switch (buf->c_type) {
1390 
1391 	case TS_CLRI:
1392 	case TS_BITS:
1393 		/*
1394 		 * Have to patch up missing information in bit map headers
1395 		 */
1396 		buf->c_size = buf->c_count * TP_BSIZE;
1397 		if (buf->c_count > TP_NINDIR)
1398 			readmapflag = 1;
1399 		else
1400 			for (i = 0; i < buf->c_count; i++)
1401 				buf->c_addr[i]++;
1402 		/* FALL THROUGH */
1403 
1404 	case TS_TAPE:
1405 		if (buf->c_magic == NFS_MAGIC &&
1406 		    (buf->c_flags & NFS_DR_NEWINODEFMT) == 0)
1407 			oldinofmt = 1;
1408 		/* FALL THROUGH */
1409 
1410 	case TS_END:
1411 		buf->c_inumber = 0;
1412 		/* FALL THROUGH */
1413 
1414 	case TS_ADDR:
1415 	case TS_INODE:
1416 		/*
1417 		 * For old dump tapes, have to copy up old fields to
1418 		 * new locations.
1419 		 */
1420 		if (buf->c_magic == NFS_MAGIC) {
1421 			buf->c_tapea = buf->c_old_tapea;
1422 			buf->c_firstrec = buf->c_old_firstrec;
1423 			buf->c_date = _time32_to_time(buf->c_old_date);
1424 			buf->c_ddate = _time32_to_time(buf->c_old_ddate);
1425 			buf->c_atime = _time32_to_time(buf->c_old_atime);
1426 			buf->c_mtime = _time32_to_time(buf->c_old_mtime);
1427 			buf->c_birthtime = 0;
1428 			buf->c_birthtimensec = 0;
1429 			buf->c_extsize = 0;
1430 		}
1431 		break;
1432 
1433 	default:
1434 		panic("gethead: unknown inode type %d\n", buf->c_type);
1435 		break;
1436 	}
1437 	if (dumpdate != 0 && _time64_to_time(buf->c_date) != dumpdate)
1438 		fprintf(stderr, "Header with wrong dumpdate.\n");
1439 	/*
1440 	 * If we're restoring a filesystem with the old (FreeBSD 1)
1441 	 * format inodes, copy the uid/gid to the new location
1442 	 */
1443 	if (oldinofmt) {
1444 		buf->c_uid = buf->c_spare1[1];
1445 		buf->c_gid = buf->c_spare1[2];
1446 	}
1447 	buf->c_magic = FS_UFS2_MAGIC;
1448 	tapeaddr = buf->c_tapea;
1449 	if (dflag)
1450 		accthdr(buf);
1451 	return(GOOD);
1452 }
1453 
1454 /*
1455  * Check that a header is where it belongs and predict the next header
1456  */
1457 static void
1458 accthdr(struct s_spcl *header)
1459 {
1460 	static ino_t previno = 0x7fffffff;
1461 	static int prevtype;
1462 	static long predict;
1463 	long blks, i;
1464 
1465 	if (header->c_type == TS_TAPE) {
1466 		fprintf(stderr, "Volume header ");
1467  		if (header->c_firstrec)
1468  			fprintf(stderr, "begins with record %qd",
1469  				header->c_firstrec);
1470  		fprintf(stderr, "\n");
1471 		previno = 0x7fffffff;
1472 		return;
1473 	}
1474 	if (previno == 0x7fffffff)
1475 		goto newcalc;
1476 	switch (prevtype) {
1477 	case TS_BITS:
1478 		fprintf(stderr, "Dumped inodes map header");
1479 		break;
1480 	case TS_CLRI:
1481 		fprintf(stderr, "Used inodes map header");
1482 		break;
1483 	case TS_INODE:
1484 		fprintf(stderr, "File header, ino %d", previno);
1485 		break;
1486 	case TS_ADDR:
1487 		fprintf(stderr, "File continuation header, ino %d", previno);
1488 		break;
1489 	case TS_END:
1490 		fprintf(stderr, "End of tape header");
1491 		break;
1492 	}
1493 	if (predict != blksread - 1)
1494 		fprintf(stderr, "; predicted %ld blocks, got %ld blocks",
1495 			predict, blksread - 1);
1496 	fprintf(stderr, "\n");
1497 newcalc:
1498 	blks = 0;
1499 	if (header->c_type != TS_END)
1500 		for (i = 0; i < header->c_count; i++)
1501 			if (readmapflag || header->c_addr[i] != 0)
1502 				blks++;
1503 	predict = blks;
1504 	blksread = 0;
1505 	prevtype = header->c_type;
1506 	previno = header->c_inumber;
1507 }
1508 
1509 /*
1510  * Find an inode header.
1511  * Complain if had to skip.
1512  */
1513 static void
1514 findinode(struct s_spcl *header)
1515 {
1516 	static long skipcnt = 0;
1517 	long i;
1518 	char buf[TP_BSIZE];
1519 	int htype;
1520 
1521 	curfile.name = "<name unknown>";
1522 	curfile.action = UNKNOWN;
1523 	curfile.mode = 0;
1524 	curfile.ino = 0;
1525 	do {
1526 		htype = header->c_type;
1527 		switch (htype) {
1528 
1529 		case TS_ADDR:
1530 			/*
1531 			 * Skip up to the beginning of the next record
1532 			 */
1533 			for (i = 0; i < header->c_count; i++)
1534 				if (header->c_addr[i])
1535 					readtape(buf);
1536 			while (gethead(header) == FAIL ||
1537 			    _time64_to_time(header->c_date) != dumpdate) {
1538 				skipcnt++;
1539 				if (Dflag) {
1540 					byteslide++;
1541 					if (byteslide < TP_BSIZE) {
1542 						blkcnt--;
1543 						blksread--;
1544 					} else
1545 						byteslide = 0;
1546 				}
1547 			}
1548 			break;
1549 
1550 		case TS_INODE:
1551 			curfile.mode = header->c_mode;
1552 			curfile.uid = header->c_uid;
1553 			curfile.gid = header->c_gid;
1554 			curfile.file_flags = header->c_file_flags;
1555 			curfile.rdev = header->c_rdev;
1556 			curfile.atime_sec = header->c_atime;
1557 			curfile.atime_nsec = header->c_atimensec;
1558 			curfile.mtime_sec = header->c_mtime;
1559 			curfile.mtime_nsec = header->c_mtimensec;
1560 			curfile.birthtime_sec = header->c_birthtime;
1561 			curfile.birthtime_nsec = header->c_birthtimensec;
1562 			curfile.extsize = header->c_extsize;
1563 			curfile.size = header->c_size;
1564 			curfile.ino = header->c_inumber;
1565 			break;
1566 
1567 		case TS_END:
1568 			/* If we missed some tapes, get another volume. */
1569 			if (tapesread & (tapesread + 1)) {
1570 				getvol(0);
1571 				continue;
1572 			}
1573 			curfile.ino = maxino;
1574 			break;
1575 
1576 		case TS_CLRI:
1577 			curfile.name = "<file removal list>";
1578 			break;
1579 
1580 		case TS_BITS:
1581 			curfile.name = "<file dump list>";
1582 			break;
1583 
1584 		case TS_TAPE:
1585 			if (Dflag)
1586 				fprintf(stderr, "unexpected tape header\n");
1587 			else
1588 				panic("unexpected tape header\n");
1589 
1590 		default:
1591 			if (Dflag)
1592 				fprintf(stderr, "unknown tape header type %d\n",
1593 				    spcl.c_type);
1594 			else
1595 				panic("unknown tape header type %d\n",
1596 				    spcl.c_type);
1597 			while (gethead(header) == FAIL ||
1598 			    _time64_to_time(header->c_date) != dumpdate) {
1599 				skipcnt++;
1600 				if (Dflag) {
1601 					byteslide++;
1602 					if (byteslide < TP_BSIZE) {
1603 						blkcnt--;
1604 						blksread--;
1605 					} else
1606 						byteslide = 0;
1607 				}
1608 			}
1609 
1610 		}
1611 	} while (htype == TS_ADDR);
1612 	if (skipcnt > 0)
1613 		fprintf(stderr, "resync restore, skipped %ld %s\n",
1614 		    skipcnt, Dflag ? "bytes" : "blocks");
1615 	skipcnt = 0;
1616 }
1617 
1618 static int
1619 checksum(int *buf)
1620 {
1621 	int i, j;
1622 
1623 	j = sizeof(union u_spcl) / sizeof(int);
1624 	i = 0;
1625 	if (!Bcvt) {
1626 		do
1627 			i += *buf++;
1628 		while (--j);
1629 	} else {
1630 		/* What happens if we want to read restore tapes
1631 			for a 16bit int machine??? */
1632 		do
1633 			i += swabl(*buf++);
1634 		while (--j);
1635 	}
1636 
1637 	if (i != CHECKSUM) {
1638 		fprintf(stderr, "Checksum error %o, inode %d file %s\n", i,
1639 			curfile.ino, curfile.name);
1640 		return(FAIL);
1641 	}
1642 	return(GOOD);
1643 }
1644 
1645 #ifdef RRESTORE
1646 #include <stdarg.h>
1647 
1648 void
1649 msg(const char *fmt, ...)
1650 {
1651 	va_list ap;
1652 	va_start(ap, fmt);
1653 	(void)vfprintf(stderr, fmt, ap);
1654 	va_end(ap);
1655 }
1656 #endif /* RRESTORE */
1657 
1658 static u_char *
1659 swabshort(u_char *sp, int n)
1660 {
1661 	char c;
1662 
1663 	while (--n >= 0) {
1664 		c = sp[0]; sp[0] = sp[1]; sp[1] = c;
1665 		sp += 2;
1666 	}
1667 	return (sp);
1668 }
1669 
1670 static u_char *
1671 swablong(u_char *sp, int n)
1672 {
1673 	char c;
1674 
1675 	while (--n >= 0) {
1676 		c = sp[0]; sp[0] = sp[3]; sp[3] = c;
1677 		c = sp[2]; sp[2] = sp[1]; sp[1] = c;
1678 		sp += 4;
1679 	}
1680 	return (sp);
1681 }
1682 
1683 static u_char *
1684 swabquad(u_char *sp, int n)
1685 {
1686 	char c;
1687 
1688 	while (--n >= 0) {
1689 		c = sp[0]; sp[0] = sp[7]; sp[7] = c;
1690 		c = sp[1]; sp[1] = sp[6]; sp[6] = c;
1691 		c = sp[2]; sp[2] = sp[5]; sp[5] = c;
1692 		c = sp[3]; sp[3] = sp[4]; sp[4] = c;
1693 		sp += 8;
1694 	}
1695 	return (sp);
1696 }
1697 
1698 void
1699 swabst(u_char *cp, u_char *sp)
1700 {
1701 	int n = 0;
1702 
1703 	while (*cp) {
1704 		switch (*cp) {
1705 		case '0': case '1': case '2': case '3': case '4':
1706 		case '5': case '6': case '7': case '8': case '9':
1707 			n = (n * 10) + (*cp++ - '0');
1708 			continue;
1709 
1710 		case 's': case 'w': case 'h':
1711 			if (n == 0)
1712 				n = 1;
1713 			sp = swabshort(sp, n);
1714 			break;
1715 
1716 		case 'l':
1717 			if (n == 0)
1718 				n = 1;
1719 			sp = swablong(sp, n);
1720 			break;
1721 
1722 		case 'q':
1723 			if (n == 0)
1724 				n = 1;
1725 			sp = swabquad(sp, n);
1726 			break;
1727 
1728 		case 'b':
1729 			if (n == 0)
1730 				n = 1;
1731 			sp += n;
1732 			break;
1733 
1734 		default:
1735 			fprintf(stderr, "Unknown conversion character: %c\n",
1736 			    *cp);
1737 			done(0);
1738 			break;
1739 		}
1740 		cp++;
1741 		n = 0;
1742 	}
1743 }
1744 
1745 static u_long
1746 swabl(u_long x)
1747 {
1748 	swabst((u_char *)"l", (u_char *)&x);
1749 	return (x);
1750 }
1751