File: savecore.c

package info (click to toggle)
freebsd-utils 10.1~svn273304-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie-kfreebsd
  • size: 14,620 kB
  • sloc: ansic: 155,497; yacc: 5,768; sh: 3,098; xml: 1,853; makefile: 1,231; cpp: 1,071; lex: 468; perl: 242
file content (835 lines) | stat: -rw-r--r-- 20,910 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
/*-
 * Copyright (c) 2002 Poul-Henning Kamp
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
 * and NAI Labs, the Security Research Division of Network Associates, Inc.
 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
 * DARPA CHATS research program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the authors may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Copyright (c) 1986, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/disk.h>
#include <sys/kerneldump.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <fstab.h>
#include <paths.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>

/* The size of the buffer used for I/O. */
#define	BUFFERSIZE	(1024*1024)

#define	STATUS_BAD	0
#define	STATUS_GOOD	1
#define	STATUS_UNKNOWN	2

static int checkfor, compress, clear, force, keep, verbose;	/* flags */
static int nfound, nsaved, nerr;			/* statistics */
static int maxdumps;

extern FILE *zopen(const char *, const char *);

static sig_atomic_t got_siginfo;
static void infohandler(int);

static void
printheader(FILE *f, const struct kerneldumpheader *h, const char *device,
    int bounds, const int status)
{
	uint64_t dumplen;
	time_t t;
	const char *stat_str;

	fprintf(f, "Dump header from device %s\n", device);
	fprintf(f, "  Architecture: %s\n", h->architecture);
	fprintf(f, "  Architecture Version: %u\n",
	    dtoh32(h->architectureversion));
	dumplen = dtoh64(h->dumplength);
	fprintf(f, "  Dump Length: %lldB (%lld MB)\n", (long long)dumplen,
	    (long long)(dumplen >> 20));
	fprintf(f, "  Blocksize: %d\n", dtoh32(h->blocksize));
	t = dtoh64(h->dumptime);
	fprintf(f, "  Dumptime: %s", ctime(&t));
	fprintf(f, "  Hostname: %s\n", h->hostname);
	fprintf(f, "  Magic: %s\n", h->magic);
	fprintf(f, "  Version String: %s", h->versionstring);
	fprintf(f, "  Panic String: %s\n", h->panicstring);
	fprintf(f, "  Dump Parity: %u\n", h->parity);
	fprintf(f, "  Bounds: %d\n", bounds);

	switch(status) {
	case STATUS_BAD:
		stat_str = "bad";
		break;
	case STATUS_GOOD:
		stat_str = "good";
		break;
	default:
		stat_str = "unknown";
	}
	fprintf(f, "  Dump Status: %s\n", stat_str);
	fflush(f);
}

static int
getbounds(void) {
	FILE *fp;
	char buf[6];
	int ret;

	ret = 0;

	if ((fp = fopen("bounds", "r")) == NULL) {
		if (verbose)
			printf("unable to open bounds file, using 0\n");
		return (ret);
	}

	if (fgets(buf, sizeof buf, fp) == NULL) {
		if (feof(fp))
			syslog(LOG_WARNING, "bounds file is empty, using 0");
		else
			syslog(LOG_WARNING, "bounds file: %s", strerror(errno));
		fclose(fp);
		return (ret);
	}

	errno = 0;
	ret = (int)strtol(buf, NULL, 10);
	if (ret == 0 && (errno == EINVAL || errno == ERANGE))
		syslog(LOG_WARNING, "invalid value found in bounds, using 0");
	fclose(fp);
	return (ret);
}

static void
writebounds(int bounds) {
	FILE *fp;

	if ((fp = fopen("bounds", "w")) == NULL) {
		syslog(LOG_WARNING, "unable to write to bounds file: %m");
		return;
	}

	if (verbose)
		printf("bounds number: %d\n", bounds);

	fprintf(fp, "%d\n", bounds);
	fclose(fp);
}

static off_t
file_size(const char *path)
{
	struct stat sb;

	/* Ignore all errors, those file may not exists. */
	if (stat(path, &sb) == -1)
		return (0);
	return (sb.st_size);
}

static off_t
saved_dump_size(int bounds)
{
	static char path[PATH_MAX];
	off_t dumpsize;

	dumpsize = 0;

	(void)snprintf(path, sizeof(path), "info.%d", bounds);
	dumpsize += file_size(path);
	(void)snprintf(path, sizeof(path), "vmcore.%d", bounds);
	dumpsize += file_size(path);
	(void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds);
	dumpsize += file_size(path);
	(void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds);
	dumpsize += file_size(path);
	(void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds);
	dumpsize += file_size(path);

	return (dumpsize);
}

static void
saved_dump_remove(int bounds)
{
	static char path[PATH_MAX];

	(void)snprintf(path, sizeof(path), "info.%d", bounds);
	(void)unlink(path);
	(void)snprintf(path, sizeof(path), "vmcore.%d", bounds);
	(void)unlink(path);
	(void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds);
	(void)unlink(path);
	(void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds);
	(void)unlink(path);
	(void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds);
	(void)unlink(path);
}

static void
symlinks_remove(void)
{

	(void)unlink("info.last");
	(void)unlink("vmcore.last");
	(void)unlink("vmcore.last.gz");
	(void)unlink("textdump.tar.last");
	(void)unlink("textdump.tar.last.gz");
}

/*
 * Check that sufficient space is available on the disk that holds the
 * save directory.
 */
static int
check_space(const char *savedir, off_t dumpsize, int bounds)
{
	FILE *fp;
	off_t minfree, spacefree, totfree, needed;
	struct statfs fsbuf;
	char buf[100];

	if (statfs(".", &fsbuf) < 0) {
		syslog(LOG_ERR, "%s: %m", savedir);
		exit(1);
	}
	spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
	totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;

	if ((fp = fopen("minfree", "r")) == NULL)
		minfree = 0;
	else {
		if (fgets(buf, sizeof(buf), fp) == NULL)
			minfree = 0;
		else
			minfree = atoi(buf);
		(void)fclose(fp);
	}

	needed = dumpsize / 1024 + 2;	/* 2 for info file */
	needed -= saved_dump_size(bounds);
	if ((minfree > 0 ? spacefree : totfree) - needed < minfree) {
		syslog(LOG_WARNING,
	"no dump, not enough free space on device (%lld available, need %lld)",
		    (long long)(minfree > 0 ? spacefree : totfree),
		    (long long)needed);
		return (0);
	}
	if (spacefree - needed < 0)
		syslog(LOG_WARNING,
		    "dump performed, but free space threshold crossed");
	return (1);
}

#define BLOCKSIZE (1<<12)
#define BLOCKMASK (~(BLOCKSIZE-1))

static int
DoRegularFile(int fd, off_t dumpsize, char *buf, const char *device,
    const char *filename, FILE *fp)
{
	int he, hs, nr, nw, wl;
	off_t dmpcnt, origsize;

	dmpcnt = 0;
	origsize = dumpsize;
	he = 0;
	while (dumpsize > 0) {
		wl = BUFFERSIZE;
		if (wl > dumpsize)
			wl = dumpsize;
		nr = read(fd, buf, wl);
		if (nr != wl) {
			if (nr == 0)
				syslog(LOG_WARNING,
				    "WARNING: EOF on dump device");
			else
				syslog(LOG_ERR, "read error on %s: %m", device);
			nerr++;
			return (-1);
		}
		if (compress) {
			nw = fwrite(buf, 1, wl, fp);
		} else {
			for (nw = 0; nw < nr; nw = he) {
				/* find a contiguous block of zeroes */
				for (hs = nw; hs < nr; hs += BLOCKSIZE) {
					for (he = hs; he < nr && buf[he] == 0;
					    ++he)
						/* nothing */ ;
					/* is the hole long enough to matter? */
					if (he >= hs + BLOCKSIZE)
						break;
				}

				/* back down to a block boundary */
				he &= BLOCKMASK;

				/*
				 * 1) Don't go beyond the end of the buffer.
				 * 2) If the end of the buffer is less than
				 *    BLOCKSIZE bytes away, we're at the end
				 *    of the file, so just grab what's left.
				 */
				if (hs + BLOCKSIZE > nr)
					hs = he = nr;

				/*
				 * At this point, we have a partial ordering:
				 *     nw <= hs <= he <= nr
				 * If hs > nw, buf[nw..hs] contains non-zero data.
				 * If he > hs, buf[hs..he] is all zeroes.
				 */
				if (hs > nw)
					if (fwrite(buf + nw, hs - nw, 1, fp)
					    != 1)
					break;
				if (he > hs)
					if (fseeko(fp, he - hs, SEEK_CUR) == -1)
						break;
			}
		}
		if (nw != wl) {
			syslog(LOG_ERR,
			    "write error on %s file: %m", filename);
			syslog(LOG_WARNING,
			    "WARNING: vmcore may be incomplete");
			nerr++;
			return (-1);
		}
		if (verbose) {
			dmpcnt += wl;
			printf("%llu\r", (unsigned long long)dmpcnt);
			fflush(stdout);
		}
		dumpsize -= wl;
		if (got_siginfo) {
			printf("%s %.1lf%%\n", filename, (100.0 - (100.0 *
			    (double)dumpsize / (double)origsize)));
			got_siginfo = 0;
		}
	}
	return (0);
}

/*
 * Specialized version of dump-reading logic for use with textdumps, which
 * are written backwards from the end of the partition, and must be reversed
 * before being written to the file.  Textdumps are small, so do a bit less
 * work to optimize/sparsify.
 */
static int
DoTextdumpFile(int fd, off_t dumpsize, off_t lasthd, char *buf,
    const char *device, const char *filename, FILE *fp)
{
	int nr, nw, wl;
	off_t dmpcnt, totsize;

	totsize = dumpsize;
	dmpcnt = 0;
	wl = 512;
	if ((dumpsize % wl) != 0) {
		syslog(LOG_ERR, "textdump uneven multiple of 512 on %s",
		    device);
		nerr++;
		return (-1);
	}
	while (dumpsize > 0) {
		nr = pread(fd, buf, wl, lasthd - (totsize - dumpsize) - wl);
		if (nr != wl) {
			if (nr == 0)
				syslog(LOG_WARNING,
				    "WARNING: EOF on dump device");
			else
				syslog(LOG_ERR, "read error on %s: %m", device);
			nerr++;
			return (-1);
		}
		nw = fwrite(buf, 1, wl, fp);
		if (nw != wl) {
			syslog(LOG_ERR,
			    "write error on %s file: %m", filename);
			syslog(LOG_WARNING,
			    "WARNING: textdump may be incomplete");
			nerr++;
			return (-1);
		}
		if (verbose) {
			dmpcnt += wl;
			printf("%llu\r", (unsigned long long)dmpcnt);
			fflush(stdout);
		}
		dumpsize -= wl;
	}
	return (0);
}

static void
DoFile(const char *savedir, const char *device)
{
	static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX];
	static char *buf = NULL;
	struct kerneldumpheader kdhf, kdhl;
	off_t mediasize, dumpsize, firsthd, lasthd;
	FILE *info, *fp;
	mode_t oumask;
	int fd, fdinfo, error;
	int bounds, status;
	u_int sectorsize;
	int istextdump;

	bounds = getbounds();
	mediasize = 0;
	status = STATUS_UNKNOWN;

	if (maxdumps > 0 && bounds == maxdumps)
		bounds = 0;

	if (buf == NULL) {
		buf = malloc(BUFFERSIZE);
		if (buf == NULL) {
			syslog(LOG_ERR, "%m");
			return;
		}
	}

	if (verbose)
		printf("checking for kernel dump on device %s\n", device);

	fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR);
	if (fd < 0) {
		syslog(LOG_ERR, "%s: %m", device);
		return;
	}

	error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
	if (!error)
		error = ioctl(fd, DIOCGSECTORSIZE, &sectorsize);
	if (error) {
		syslog(LOG_ERR,
		    "couldn't find media and/or sector size of %s: %m", device);
		goto closefd;
	}

	if (verbose) {
		printf("mediasize = %lld\n", (long long)mediasize);
		printf("sectorsize = %u\n", sectorsize);
	}

	lasthd = mediasize - sectorsize;
	lseek(fd, lasthd, SEEK_SET);
	error = read(fd, &kdhl, sizeof kdhl);
	if (error != sizeof kdhl) {
		syslog(LOG_ERR,
		    "error reading last dump header at offset %lld in %s: %m",
		    (long long)lasthd, device);
		goto closefd;
	}
	istextdump = 0;
	if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) {
		if (verbose)
			printf("textdump magic on last dump header on %s\n",
			    device);
		istextdump = 1;
		if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) {
			syslog(LOG_ERR,
			    "unknown version (%d) in last dump header on %s",
			    dtoh32(kdhl.version), device);

			status = STATUS_BAD;
			if (force == 0)
				goto closefd;
		}
	} else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) ==
	    0) {
		if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
			syslog(LOG_ERR,
			    "unknown version (%d) in last dump header on %s",
			    dtoh32(kdhl.version), device);

			status = STATUS_BAD;
			if (force == 0)
				goto closefd;
		}
	} else {
		if (verbose)
			printf("magic mismatch on last dump header on %s\n",
			    device);

		status = STATUS_BAD;
		if (force == 0)
			goto closefd;

		if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
			    sizeof kdhl.magic) == 0) {
			if (verbose)
				printf("forcing magic on %s\n", device);
			memcpy(kdhl.magic, KERNELDUMPMAGIC,
			    sizeof kdhl.magic);
		} else {
			syslog(LOG_ERR, "unable to force dump - bad magic");
			goto closefd;
		}
		if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
			syslog(LOG_ERR,
			    "unknown version (%d) in last dump header on %s",
			    dtoh32(kdhl.version), device);

			status = STATUS_BAD;
			if (force == 0)
				goto closefd;
		}
	}

	nfound++;
	if (clear)
		goto nuke;

	if (kerneldump_parity(&kdhl)) {
		syslog(LOG_ERR,
		    "parity error on last dump header on %s", device);
		nerr++;
		status = STATUS_BAD;
		if (force == 0)
			goto closefd;
	}
	dumpsize = dtoh64(kdhl.dumplength);
	firsthd = lasthd - dumpsize - sizeof kdhf;
	lseek(fd, firsthd, SEEK_SET);
	error = read(fd, &kdhf, sizeof kdhf);
	if (error != sizeof kdhf) {
		syslog(LOG_ERR,
		    "error reading first dump header at offset %lld in %s: %m",
		    (long long)firsthd, device);
		nerr++;
		goto closefd;
	}

	if (verbose >= 2) {
		printf("First dump headers:\n");
		printheader(stdout, &kdhf, device, bounds, -1);

		printf("\nLast dump headers:\n");
		printheader(stdout, &kdhl, device, bounds, -1);
		printf("\n");
	}

	if (memcmp(&kdhl, &kdhf, sizeof kdhl)) {
		syslog(LOG_ERR,
		    "first and last dump headers disagree on %s", device);
		nerr++;
		status = STATUS_BAD;
		if (force == 0)
			goto closefd;
	} else {
		status = STATUS_GOOD;
	}

	if (checkfor) {
		printf("A dump exists on %s\n", device);
		close(fd);
		exit(0);
	}

	if (kdhl.panicstring[0])
		syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring);
	else
		syslog(LOG_ALERT, "reboot");

	if (verbose)
		printf("Checking for available free space\n");

	if (!check_space(savedir, dumpsize, bounds)) {
		nerr++;
		goto closefd;
	}

	writebounds(bounds + 1);

	saved_dump_remove(bounds);

	snprintf(infoname, sizeof(infoname), "info.%d", bounds);

	/*
	 * Create or overwrite any existing dump header files.
	 */
	fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600);
	if (fdinfo < 0) {
		syslog(LOG_ERR, "%s: %m", infoname);
		nerr++;
		goto closefd;
	}
	oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
	if (compress) {
		snprintf(corename, sizeof(corename), "%s.%d.gz",
		    istextdump ? "textdump.tar" : "vmcore", bounds);
		fp = zopen(corename, "w");
	} else {
		snprintf(corename, sizeof(corename), "%s.%d",
		    istextdump ? "textdump.tar" : "vmcore", bounds);
		fp = fopen(corename, "w");
	}
	if (fp == NULL) {
		syslog(LOG_ERR, "%s: %m", corename);
		close(fdinfo);
		nerr++;
		goto closefd;
	}
	(void)umask(oumask);

	info = fdopen(fdinfo, "w");

	if (info == NULL) {
		syslog(LOG_ERR, "fdopen failed: %m");
		nerr++;
		goto closefd;
	}

	if (verbose)
		printheader(stdout, &kdhl, device, bounds, status);

	printheader(info, &kdhl, device, bounds, status);
	fclose(info);

	syslog(LOG_NOTICE, "writing %score to %s/%s",
	    compress ? "compressed " : "", savedir, corename);

	if (istextdump) {
		if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device,
		    corename, fp) < 0)
			goto closeall;
	} else {
		if (DoRegularFile(fd, dumpsize, buf, device, corename, fp)
		    < 0)
			goto closeall;
	}
	if (verbose)
		printf("\n");

	if (fclose(fp) < 0) {
		syslog(LOG_ERR, "error on %s: %m", corename);
		nerr++;
		goto closefd;
	}

	symlinks_remove();
	if (symlink(infoname, "info.last") == -1) {
		syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
		    savedir, "info.last");
	}
	if (compress) {
		snprintf(linkname, sizeof(linkname), "%s.last.gz",
		    istextdump ? "textdump.tar" : "vmcore");
	} else {
		snprintf(linkname, sizeof(linkname), "%s.last",
		    istextdump ? "textdump.tar" : "vmcore");
	}
	if (symlink(corename, linkname) == -1) {
		syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
		    savedir, linkname);
	}

	nsaved++;

	if (verbose)
		printf("dump saved\n");

nuke:
	if (!keep) {
		if (verbose)
			printf("clearing dump header\n");
		memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic);
		lseek(fd, lasthd, SEEK_SET);
		error = write(fd, &kdhl, sizeof kdhl);
		if (error != sizeof kdhl)
			syslog(LOG_ERR,
			    "error while clearing the dump header: %m");
	}
	close(fd);
	return;

closeall:
	fclose(fp);

closefd:
	close(fd);
}

static void
usage(void)
{
	fprintf(stderr, "%s\n%s\n%s\n",
	    "usage: savecore -c [-v] [device ...]",
	    "       savecore -C [-v] [device ...]",
	    "       savecore [-fkvz] [-m maxdumps] [directory [device ...]]");
	exit(1);
}

int
main(int argc, char **argv)
{
	const char *savedir = ".";
	struct fstab *fsp;
	int i, ch, error;

	checkfor = compress = clear = force = keep = verbose = 0;
	nfound = nsaved = nerr = 0;

	openlog("savecore", LOG_PERROR, LOG_DAEMON);
	signal(SIGINFO, infohandler);

	while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1)
		switch(ch) {
		case 'C':
			checkfor = 1;
			break;
		case 'c':
			clear = 1;
			break;
		case 'f':
			force = 1;
			break;
		case 'k':
			keep = 1;
			break;
		case 'm':
			maxdumps = atoi(optarg);
			if (maxdumps <= 0) {
				syslog(LOG_ERR, "Invalid maxdump value");
				exit(1);
			}
			break;
		case 'v':
			verbose++;
			break;
		case 'z':
			compress = 1;
			break;
		case '?':
		default:
			usage();
		}
	if (checkfor && (clear || force || keep))
		usage();
	if (clear && (compress || keep))
		usage();
	if (maxdumps > 0 && (checkfor || clear))
		usage();
	argc -= optind;
	argv += optind;
	if (argc >= 1 && !checkfor && !clear) {
		error = chdir(argv[0]);
		if (error) {
			syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
			exit(1);
		}
		savedir = argv[0];
		argc--;
		argv++;
	}
	if (argc == 0) {
		for (;;) {
			fsp = getfsent();
			if (fsp == NULL)
				break;
			if (strcmp(fsp->fs_vfstype, "swap") &&
			    strcmp(fsp->fs_vfstype, "dump"))
				continue;
			DoFile(savedir, fsp->fs_spec);
		}
	} else {
		for (i = 0; i < argc; i++)
			DoFile(savedir, argv[i]);
	}

	/* Emit minimal output. */
	if (nfound == 0) {
		if (checkfor) {
			printf("No dump exists\n");
			exit(1);
		}
		syslog(LOG_WARNING, "no dumps found");
	}
	else if (nsaved == 0) {
		if (nerr != 0)
			syslog(LOG_WARNING, "unsaved dumps found but not saved");
		else
			syslog(LOG_WARNING, "no unsaved dumps found");
	}

	return (0);
}

static void
infohandler(int sig __unused)
{
	got_siginfo = 1;
}