1/*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * Copyright (c) 1986, 1992, 1993
36 *	The Regents of the University of California.  All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 *    notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 *    notice, this list of conditions and the following disclaimer in the
45 *    documentation and/or other materials provided with the distribution.
46 * 4. Neither the name of the University nor the names of its contributors
47 *    may be used to endorse or promote products derived from this software
48 *    without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63#include <sys/cdefs.h>
64__FBSDID("$FreeBSD: releng/11.0/sbin/savecore/savecore.c 298315 2016-04-20 00:49:49Z ngie $");
65
66#include <sys/param.h>
67#include <sys/disk.h>
68#include <sys/kerneldump.h>
69#include <sys/mount.h>
70#include <sys/stat.h>
71#include <errno.h>
72#include <fcntl.h>
73#include <fstab.h>
74#include <paths.h>
75#include <signal.h>
76#include <stdarg.h>
77#include <stdio.h>
78#include <stdlib.h>
79#include <string.h>
80#include <syslog.h>
81#include <time.h>
82#include <unistd.h>
83#include <libxo/xo.h>
84
85/* The size of the buffer used for I/O. */
86#define	BUFFERSIZE	(1024*1024)
87
88#define	STATUS_BAD	0
89#define	STATUS_GOOD	1
90#define	STATUS_UNKNOWN	2
91
92static int checkfor, compress, clear, force, keep, verbose;	/* flags */
93static int nfound, nsaved, nerr;			/* statistics */
94static int maxdumps;
95
96extern FILE *zopen(const char *, const char *);
97
98static sig_atomic_t got_siginfo;
99static void infohandler(int);
100
101static void
102printheader(xo_handle_t *xo, const struct kerneldumpheader *h, const char *device,
103    int bounds, const int status)
104{
105	uint64_t dumplen;
106	time_t t;
107	const char *stat_str;
108
109	xo_flush_h(xo);
110	xo_emit_h(xo, "{Lwc:Dump header from device}{:dump_device/%s}\n", device);
111	xo_emit_h(xo, "{P:  }{Lwc:Architecture}{:architecture/%s}\n", h->architecture);
112	xo_emit_h(xo, "{P:  }{Lwc:Architecture Version}{:architecture_version/%u}\n", dtoh32(h->architectureversion));
113	dumplen = dtoh64(h->dumplength);
114	xo_emit_h(xo, "{P:  }{Lwc:Dump Length}{:dump_length_bytes/%lld}\n", (long long)dumplen);
115	xo_emit_h(xo, "{P:  }{Lwc:Blocksize}{:blocksize/%d}\n", dtoh32(h->blocksize));
116	t = dtoh64(h->dumptime);
117	xo_emit_h(xo, "{P:  }{Lwc:Dumptime}{:dumptime/%s}", ctime(&t));
118	xo_emit_h(xo, "{P:  }{Lwc:Hostname}{:hostname/%s}\n", h->hostname);
119	xo_emit_h(xo, "{P:  }{Lwc:Magic}{:magic/%s}\n", h->magic);
120	xo_emit_h(xo, "{P:  }{Lwc:Version String}{:version_string/%s}", h->versionstring);
121	xo_emit_h(xo, "{P:  }{Lwc:Panic String}{:panic_string/%s}\n", h->panicstring);
122	xo_emit_h(xo, "{P:  }{Lwc:Dump Parity}{:dump_parity/%u}\n", h->parity);
123	xo_emit_h(xo, "{P:  }{Lwc:Bounds}{:bounds/%d}\n", bounds);
124
125	switch(status) {
126	case STATUS_BAD:
127		stat_str = "bad";
128		break;
129	case STATUS_GOOD:
130		stat_str = "good";
131		break;
132	default:
133		stat_str = "unknown";
134	}
135	xo_emit_h(xo, "{P:  }{Lwc:Dump Status}{:dump_status/%s}\n", stat_str);
136	xo_flush_h(xo);
137}
138
139static int
140getbounds(void) {
141	FILE *fp;
142	char buf[6];
143	int ret;
144
145	ret = 0;
146
147	if ((fp = fopen("bounds", "r")) == NULL) {
148		if (verbose)
149			printf("unable to open bounds file, using 0\n");
150		return (ret);
151	}
152
153	if (fgets(buf, sizeof buf, fp) == NULL) {
154		if (feof(fp))
155			syslog(LOG_WARNING, "bounds file is empty, using 0");
156		else
157			syslog(LOG_WARNING, "bounds file: %s", strerror(errno));
158		fclose(fp);
159		return (ret);
160	}
161
162	errno = 0;
163	ret = (int)strtol(buf, NULL, 10);
164	if (ret == 0 && (errno == EINVAL || errno == ERANGE))
165		syslog(LOG_WARNING, "invalid value found in bounds, using 0");
166	fclose(fp);
167	return (ret);
168}
169
170static void
171writebounds(int bounds) {
172	FILE *fp;
173
174	if ((fp = fopen("bounds", "w")) == NULL) {
175		syslog(LOG_WARNING, "unable to write to bounds file: %m");
176		return;
177	}
178
179	if (verbose)
180		printf("bounds number: %d\n", bounds);
181
182	fprintf(fp, "%d\n", bounds);
183	fclose(fp);
184}
185
186static off_t
187file_size(const char *path)
188{
189	struct stat sb;
190
191	/* Ignore all errors, those file may not exists. */
192	if (stat(path, &sb) == -1)
193		return (0);
194	return (sb.st_size);
195}
196
197static off_t
198saved_dump_size(int bounds)
199{
200	static char path[PATH_MAX];
201	off_t dumpsize;
202
203	dumpsize = 0;
204
205	(void)snprintf(path, sizeof(path), "info.%d", bounds);
206	dumpsize += file_size(path);
207	(void)snprintf(path, sizeof(path), "vmcore.%d", bounds);
208	dumpsize += file_size(path);
209	(void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds);
210	dumpsize += file_size(path);
211	(void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds);
212	dumpsize += file_size(path);
213	(void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds);
214	dumpsize += file_size(path);
215
216	return (dumpsize);
217}
218
219static void
220saved_dump_remove(int bounds)
221{
222	static char path[PATH_MAX];
223
224	(void)snprintf(path, sizeof(path), "info.%d", bounds);
225	(void)unlink(path);
226	(void)snprintf(path, sizeof(path), "vmcore.%d", bounds);
227	(void)unlink(path);
228	(void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds);
229	(void)unlink(path);
230	(void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds);
231	(void)unlink(path);
232	(void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds);
233	(void)unlink(path);
234}
235
236static void
237symlinks_remove(void)
238{
239
240	(void)unlink("info.last");
241	(void)unlink("vmcore.last");
242	(void)unlink("vmcore.last.gz");
243	(void)unlink("textdump.tar.last");
244	(void)unlink("textdump.tar.last.gz");
245}
246
247/*
248 * Check that sufficient space is available on the disk that holds the
249 * save directory.
250 */
251static int
252check_space(const char *savedir, off_t dumpsize, int bounds)
253{
254	FILE *fp;
255	off_t minfree, spacefree, totfree, needed;
256	struct statfs fsbuf;
257	char buf[100];
258
259	if (statfs(".", &fsbuf) < 0) {
260		syslog(LOG_ERR, "%s: %m", savedir);
261		exit(1);
262	}
263	spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
264	totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;
265
266	if ((fp = fopen("minfree", "r")) == NULL)
267		minfree = 0;
268	else {
269		if (fgets(buf, sizeof(buf), fp) == NULL)
270			minfree = 0;
271		else
272			minfree = atoi(buf);
273		(void)fclose(fp);
274	}
275
276	needed = dumpsize / 1024 + 2;	/* 2 for info file */
277	needed -= saved_dump_size(bounds);
278	if ((minfree > 0 ? spacefree : totfree) - needed < minfree) {
279		syslog(LOG_WARNING,
280	"no dump, not enough free space on device (%lld available, need %lld)",
281		    (long long)(minfree > 0 ? spacefree : totfree),
282		    (long long)needed);
283		return (0);
284	}
285	if (spacefree - needed < 0)
286		syslog(LOG_WARNING,
287		    "dump performed, but free space threshold crossed");
288	return (1);
289}
290
291#define BLOCKSIZE (1<<12)
292#define BLOCKMASK (~(BLOCKSIZE-1))
293
294static int
295DoRegularFile(int fd, off_t dumpsize, char *buf, const char *device,
296    const char *filename, FILE *fp)
297{
298	int he, hs, nr, nw, wl;
299	off_t dmpcnt, origsize;
300
301	dmpcnt = 0;
302	origsize = dumpsize;
303	he = 0;
304	while (dumpsize > 0) {
305		wl = BUFFERSIZE;
306		if (wl > dumpsize)
307			wl = dumpsize;
308		nr = read(fd, buf, wl);
309		if (nr != wl) {
310			if (nr == 0)
311				syslog(LOG_WARNING,
312				    "WARNING: EOF on dump device");
313			else
314				syslog(LOG_ERR, "read error on %s: %m", device);
315			nerr++;
316			return (-1);
317		}
318		if (compress) {
319			nw = fwrite(buf, 1, wl, fp);
320		} else {
321			for (nw = 0; nw < nr; nw = he) {
322				/* find a contiguous block of zeroes */
323				for (hs = nw; hs < nr; hs += BLOCKSIZE) {
324					for (he = hs; he < nr && buf[he] == 0;
325					    ++he)
326						/* nothing */ ;
327					/* is the hole long enough to matter? */
328					if (he >= hs + BLOCKSIZE)
329						break;
330				}
331
332				/* back down to a block boundary */
333				he &= BLOCKMASK;
334
335				/*
336				 * 1) Don't go beyond the end of the buffer.
337				 * 2) If the end of the buffer is less than
338				 *    BLOCKSIZE bytes away, we're at the end
339				 *    of the file, so just grab what's left.
340				 */
341				if (hs + BLOCKSIZE > nr)
342					hs = he = nr;
343
344				/*
345				 * At this point, we have a partial ordering:
346				 *     nw <= hs <= he <= nr
347				 * If hs > nw, buf[nw..hs] contains non-zero data.
348				 * If he > hs, buf[hs..he] is all zeroes.
349				 */
350				if (hs > nw)
351					if (fwrite(buf + nw, hs - nw, 1, fp)
352					    != 1)
353					break;
354				if (he > hs)
355					if (fseeko(fp, he - hs, SEEK_CUR) == -1)
356						break;
357			}
358		}
359		if (nw != wl) {
360			syslog(LOG_ERR,
361			    "write error on %s file: %m", filename);
362			syslog(LOG_WARNING,
363			    "WARNING: vmcore may be incomplete");
364			nerr++;
365			return (-1);
366		}
367		if (verbose) {
368			dmpcnt += wl;
369			printf("%llu\r", (unsigned long long)dmpcnt);
370			fflush(stdout);
371		}
372		dumpsize -= wl;
373		if (got_siginfo) {
374			printf("%s %.1lf%%\n", filename, (100.0 - (100.0 *
375			    (double)dumpsize / (double)origsize)));
376			got_siginfo = 0;
377		}
378	}
379	return (0);
380}
381
382/*
383 * Specialized version of dump-reading logic for use with textdumps, which
384 * are written backwards from the end of the partition, and must be reversed
385 * before being written to the file.  Textdumps are small, so do a bit less
386 * work to optimize/sparsify.
387 */
388static int
389DoTextdumpFile(int fd, off_t dumpsize, off_t lasthd, char *buf,
390    const char *device, const char *filename, FILE *fp)
391{
392	int nr, nw, wl;
393	off_t dmpcnt, totsize;
394
395	totsize = dumpsize;
396	dmpcnt = 0;
397	wl = 512;
398	if ((dumpsize % wl) != 0) {
399		syslog(LOG_ERR, "textdump uneven multiple of 512 on %s",
400		    device);
401		nerr++;
402		return (-1);
403	}
404	while (dumpsize > 0) {
405		nr = pread(fd, buf, wl, lasthd - (totsize - dumpsize) - wl);
406		if (nr != wl) {
407			if (nr == 0)
408				syslog(LOG_WARNING,
409				    "WARNING: EOF on dump device");
410			else
411				syslog(LOG_ERR, "read error on %s: %m", device);
412			nerr++;
413			return (-1);
414		}
415		nw = fwrite(buf, 1, wl, fp);
416		if (nw != wl) {
417			syslog(LOG_ERR,
418			    "write error on %s file: %m", filename);
419			syslog(LOG_WARNING,
420			    "WARNING: textdump may be incomplete");
421			nerr++;
422			return (-1);
423		}
424		if (verbose) {
425			dmpcnt += wl;
426			printf("%llu\r", (unsigned long long)dmpcnt);
427			fflush(stdout);
428		}
429		dumpsize -= wl;
430	}
431	return (0);
432}
433
434static void
435DoFile(const char *savedir, const char *device)
436{
437	xo_handle_t *xostdout, *xoinfo;
438	static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX];
439	static char *buf = NULL, *temp = NULL;
440	struct kerneldumpheader kdhf, kdhl;
441	off_t mediasize, dumpsize, firsthd, lasthd;
442	FILE *info, *fp;
443	mode_t oumask;
444	int fd, fdinfo, error;
445	int bounds, status;
446	u_int sectorsize, xostyle;
447	int istextdump;
448
449	bounds = getbounds();
450	mediasize = 0;
451	status = STATUS_UNKNOWN;
452
453	xostdout = xo_create_to_file(stdout, XO_STYLE_TEXT, 0);
454	if (xostdout == NULL) {
455		syslog(LOG_ERR, "%s: %m", infoname);
456		return;
457	}
458
459	if (maxdumps > 0 && bounds == maxdumps)
460		bounds = 0;
461
462	if (buf == NULL) {
463		buf = malloc(BUFFERSIZE);
464		if (buf == NULL) {
465			syslog(LOG_ERR, "%m");
466			return;
467		}
468	}
469
470	if (verbose)
471		printf("checking for kernel dump on device %s\n", device);
472
473	fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR);
474	if (fd < 0) {
475		syslog(LOG_ERR, "%s: %m", device);
476		return;
477	}
478
479	error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
480	if (!error)
481		error = ioctl(fd, DIOCGSECTORSIZE, &sectorsize);
482	if (error) {
483		syslog(LOG_ERR,
484		    "couldn't find media and/or sector size of %s: %m", device);
485		goto closefd;
486	}
487
488	if (verbose) {
489		printf("mediasize = %lld\n", (long long)mediasize);
490		printf("sectorsize = %u\n", sectorsize);
491	}
492
493	if (sectorsize < sizeof(kdhl)) {
494		syslog(LOG_ERR,
495		    "Sector size is less the kernel dump header %zu",
496		    sizeof(kdhl));
497		goto closefd;
498	}
499
500	lasthd = mediasize - sectorsize;
501	if (temp == NULL) {
502		temp = malloc(sectorsize);
503		if (temp == NULL) {
504			syslog(LOG_ERR, "%m");
505			goto closefd;
506		}
507	}
508	if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
509	    read(fd, temp, sectorsize) != (ssize_t)sectorsize) {
510		syslog(LOG_ERR,
511		    "error reading last dump header at offset %lld in %s: %m",
512		    (long long)lasthd, device);
513		goto closefd;
514	}
515	memcpy(&kdhl, temp, sizeof(kdhl));
516	istextdump = 0;
517	if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) {
518		if (verbose)
519			printf("textdump magic on last dump header on %s\n",
520			    device);
521		istextdump = 1;
522		if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) {
523			syslog(LOG_ERR,
524			    "unknown version (%d) in last dump header on %s",
525			    dtoh32(kdhl.version), device);
526
527			status = STATUS_BAD;
528			if (force == 0)
529				goto closefd;
530		}
531	} else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) ==
532	    0) {
533		if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
534			syslog(LOG_ERR,
535			    "unknown version (%d) in last dump header on %s",
536			    dtoh32(kdhl.version), device);
537
538			status = STATUS_BAD;
539			if (force == 0)
540				goto closefd;
541		}
542	} else {
543		if (verbose)
544			printf("magic mismatch on last dump header on %s\n",
545			    device);
546
547		status = STATUS_BAD;
548		if (force == 0)
549			goto closefd;
550
551		if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
552			    sizeof kdhl.magic) == 0) {
553			if (verbose)
554				printf("forcing magic on %s\n", device);
555			memcpy(kdhl.magic, KERNELDUMPMAGIC,
556			    sizeof kdhl.magic);
557		} else {
558			syslog(LOG_ERR, "unable to force dump - bad magic");
559			goto closefd;
560		}
561		if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
562			syslog(LOG_ERR,
563			    "unknown version (%d) in last dump header on %s",
564			    dtoh32(kdhl.version), device);
565
566			status = STATUS_BAD;
567			if (force == 0)
568				goto closefd;
569		}
570	}
571
572	nfound++;
573	if (clear)
574		goto nuke;
575
576	if (kerneldump_parity(&kdhl)) {
577		syslog(LOG_ERR,
578		    "parity error on last dump header on %s", device);
579		nerr++;
580		status = STATUS_BAD;
581		if (force == 0)
582			goto closefd;
583	}
584	dumpsize = dtoh64(kdhl.dumplength);
585	firsthd = lasthd - dumpsize - sectorsize;
586	if (lseek(fd, firsthd, SEEK_SET) != firsthd ||
587	    read(fd, temp, sectorsize) != (ssize_t)sectorsize) {
588		syslog(LOG_ERR,
589		    "error reading first dump header at offset %lld in %s: %m",
590		    (long long)firsthd, device);
591		nerr++;
592		goto closefd;
593	}
594	memcpy(&kdhf, temp, sizeof(kdhf));
595
596	if (verbose >= 2) {
597		printf("First dump headers:\n");
598		printheader(xostdout, &kdhf, device, bounds, -1);
599
600		printf("\nLast dump headers:\n");
601		printheader(xostdout, &kdhl, device, bounds, -1);
602		printf("\n");
603	}
604
605	if (memcmp(&kdhl, &kdhf, sizeof(kdhl))) {
606		syslog(LOG_ERR,
607		    "first and last dump headers disagree on %s", device);
608		nerr++;
609		status = STATUS_BAD;
610		if (force == 0)
611			goto closefd;
612	} else {
613		status = STATUS_GOOD;
614	}
615
616	if (checkfor) {
617		printf("A dump exists on %s\n", device);
618		close(fd);
619		exit(0);
620	}
621
622	if (kdhl.panicstring[0] != '\0')
623		syslog(LOG_ALERT, "reboot after panic: %*s",
624		    (int)sizeof(kdhl.panicstring), kdhl.panicstring);
625	else
626		syslog(LOG_ALERT, "reboot");
627
628	if (verbose)
629		printf("Checking for available free space\n");
630
631	if (!check_space(savedir, dumpsize, bounds)) {
632		nerr++;
633		goto closefd;
634	}
635
636	writebounds(bounds + 1);
637
638	saved_dump_remove(bounds);
639
640	snprintf(infoname, sizeof(infoname), "info.%d", bounds);
641
642	/*
643	 * Create or overwrite any existing dump header files.
644	 */
645	fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600);
646	if (fdinfo < 0) {
647		syslog(LOG_ERR, "%s: %m", infoname);
648		nerr++;
649		goto closefd;
650	}
651
652	oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
653	if (compress) {
654		snprintf(corename, sizeof(corename), "%s.%d.gz",
655		    istextdump ? "textdump.tar" : "vmcore", bounds);
656		fp = zopen(corename, "w");
657	} else {
658		snprintf(corename, sizeof(corename), "%s.%d",
659		    istextdump ? "textdump.tar" : "vmcore", bounds);
660		fp = fopen(corename, "w");
661	}
662	if (fp == NULL) {
663		syslog(LOG_ERR, "%s: %m", corename);
664		close(fdinfo);
665		nerr++;
666		goto closefd;
667	}
668	(void)umask(oumask);
669
670	info = fdopen(fdinfo, "w");
671
672	if (info == NULL) {
673		syslog(LOG_ERR, "fdopen failed: %m");
674		nerr++;
675		goto closeall;
676	}
677
678	xostyle = xo_get_style(NULL);
679	xoinfo = xo_create_to_file(info, xostyle, 0);
680	if (xoinfo == NULL) {
681		syslog(LOG_ERR, "%s: %m", infoname);
682		nerr++;
683		goto closeall;
684	}
685	xo_open_container_h(xoinfo, "crashdump");
686
687	if (verbose)
688		printheader(xostdout, &kdhl, device, bounds, status);
689
690	printheader(xoinfo, &kdhl, device, bounds, status);
691	xo_close_container_h(xoinfo, "crashdump");
692	xo_flush_h(xoinfo);
693	xo_finish_h(xoinfo);
694	fclose(info);
695
696	syslog(LOG_NOTICE, "writing %score to %s/%s",
697	    compress ? "compressed " : "", savedir, corename);
698
699	if (istextdump) {
700		if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device,
701		    corename, fp) < 0)
702			goto closeall;
703	} else {
704		if (DoRegularFile(fd, dumpsize, buf, device, corename, fp)
705		    < 0)
706			goto closeall;
707	}
708	if (verbose)
709		printf("\n");
710
711	if (fclose(fp) < 0) {
712		syslog(LOG_ERR, "error on %s: %m", corename);
713		nerr++;
714		goto closefd;
715	}
716
717	symlinks_remove();
718	if (symlink(infoname, "info.last") == -1) {
719		syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
720		    savedir, "info.last");
721	}
722	if (compress) {
723		snprintf(linkname, sizeof(linkname), "%s.last.gz",
724		    istextdump ? "textdump.tar" : "vmcore");
725	} else {
726		snprintf(linkname, sizeof(linkname), "%s.last",
727		    istextdump ? "textdump.tar" : "vmcore");
728	}
729	if (symlink(corename, linkname) == -1) {
730		syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
731		    savedir, linkname);
732	}
733
734	nsaved++;
735
736	if (verbose)
737		printf("dump saved\n");
738
739nuke:
740	if (!keep) {
741		if (verbose)
742			printf("clearing dump header\n");
743		memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof(kdhl.magic));
744		memcpy(temp, &kdhl, sizeof(kdhl));
745		if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
746		    write(fd, temp, sectorsize) != (ssize_t)sectorsize)
747			syslog(LOG_ERR,
748			    "error while clearing the dump header: %m");
749	}
750	xo_close_container_h(xostdout, "crashdump");
751	xo_finish_h(xostdout);
752	close(fd);
753	return;
754
755closeall:
756	fclose(fp);
757
758closefd:
759	close(fd);
760}
761
762static void
763usage(void)
764{
765	xo_error("%s\n%s\n%s\n",
766	    "usage: savecore -c [-v] [device ...]",
767	    "       savecore -C [-v] [device ...]",
768	    "       savecore [-fkvz] [-m maxdumps] [directory [device ...]]");
769	exit(1);
770}
771
772int
773main(int argc, char **argv)
774{
775	const char *savedir = ".";
776	struct fstab *fsp;
777	int i, ch, error;
778
779	checkfor = compress = clear = force = keep = verbose = 0;
780	nfound = nsaved = nerr = 0;
781
782	openlog("savecore", LOG_PERROR, LOG_DAEMON);
783	signal(SIGINFO, infohandler);
784
785	argc = xo_parse_args(argc, argv);
786	if (argc < 0)
787		exit(1);
788
789	while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1)
790		switch(ch) {
791		case 'C':
792			checkfor = 1;
793			break;
794		case 'c':
795			clear = 1;
796			break;
797		case 'f':
798			force = 1;
799			break;
800		case 'k':
801			keep = 1;
802			break;
803		case 'm':
804			maxdumps = atoi(optarg);
805			if (maxdumps <= 0) {
806				syslog(LOG_ERR, "Invalid maxdump value");
807				exit(1);
808			}
809			break;
810		case 'v':
811			verbose++;
812			break;
813		case 'z':
814			compress = 1;
815			break;
816		case '?':
817		default:
818			usage();
819		}
820	if (checkfor && (clear || force || keep))
821		usage();
822	if (clear && (compress || keep))
823		usage();
824	if (maxdumps > 0 && (checkfor || clear))
825		usage();
826	argc -= optind;
827	argv += optind;
828	if (argc >= 1 && !checkfor && !clear) {
829		error = chdir(argv[0]);
830		if (error) {
831			syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
832			exit(1);
833		}
834		savedir = argv[0];
835		argc--;
836		argv++;
837	}
838	if (argc == 0) {
839		for (;;) {
840			fsp = getfsent();
841			if (fsp == NULL)
842				break;
843			if (strcmp(fsp->fs_vfstype, "swap") &&
844			    strcmp(fsp->fs_vfstype, "dump"))
845				continue;
846			DoFile(savedir, fsp->fs_spec);
847		}
848		endfsent();
849	} else {
850		for (i = 0; i < argc; i++)
851			DoFile(savedir, argv[i]);
852	}
853
854	/* Emit minimal output. */
855	if (nfound == 0) {
856		if (checkfor) {
857			if (verbose)
858				printf("No dump exists\n");
859			exit(1);
860		}
861		if (verbose)
862			syslog(LOG_WARNING, "no dumps found");
863	} else if (nsaved == 0) {
864		if (nerr != 0) {
865			if (verbose)
866				syslog(LOG_WARNING, "unsaved dumps found but not saved");
867			exit(1);
868		} else if (verbose)
869			syslog(LOG_WARNING, "no unsaved dumps found");
870	}
871
872	return (0);
873}
874
875static void
876infohandler(int sig __unused)
877{
878	got_siginfo = 1;
879}
880