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("$FreeBSD$");
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
84 /* The size of the buffer used for I/O. */
85 #define BUFFERSIZE (1024*1024)
86
87 #define STATUS_BAD 0
88 #define STATUS_GOOD 1
89 #define STATUS_UNKNOWN 2
90
91 static int checkfor, compress, clear, force, keep, verbose; /* flags */
92 static int nfound, nsaved, nerr; /* statistics */
93 static int maxdumps;
94
95 extern FILE *zopen(const char *, const char *);
96
97 static sig_atomic_t got_siginfo;
98 static void infohandler(int);
99
100 static void
printheader(FILE * f,const struct kerneldumpheader * h,const char * device,int bounds,const int status)101 printheader(FILE *f, const struct kerneldumpheader *h, const char *device,
102 int bounds, const int status)
103 {
104 uint64_t dumplen;
105 time_t t;
106 const char *stat_str;
107
108 fprintf(f, "Dump header from device %s\n", device);
109 fprintf(f, " Architecture: %s\n", h->architecture);
110 fprintf(f, " Architecture Version: %u\n",
111 dtoh32(h->architectureversion));
112 dumplen = dtoh64(h->dumplength);
113 fprintf(f, " Dump Length: %lldB (%lld MB)\n", (long long)dumplen,
114 (long long)(dumplen >> 20));
115 fprintf(f, " Blocksize: %d\n", dtoh32(h->blocksize));
116 t = dtoh64(h->dumptime);
117 fprintf(f, " Dumptime: %s", ctime(&t));
118 fprintf(f, " Hostname: %s\n", h->hostname);
119 fprintf(f, " Magic: %s\n", h->magic);
120 fprintf(f, " Version String: %s", h->versionstring);
121 fprintf(f, " Panic String: %s\n", h->panicstring);
122 fprintf(f, " Dump Parity: %u\n", h->parity);
123 fprintf(f, " 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 fprintf(f, " Dump Status: %s\n", stat_str);
136 fflush(f);
137 }
138
139 static int
getbounds(void)140 getbounds(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
170 static void
writebounds(int bounds)171 writebounds(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
186 static off_t
file_size(const char * path)187 file_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
197 static off_t
saved_dump_size(int bounds)198 saved_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
219 static void
saved_dump_remove(int bounds)220 saved_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
236 static void
symlinks_remove(void)237 symlinks_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 */
251 static int
check_space(const char * savedir,off_t dumpsize,int bounds)252 check_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
294 static int
DoRegularFile(int fd,off_t dumpsize,char * buf,const char * device,const char * filename,FILE * fp)295 DoRegularFile(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 */
388 static int
DoTextdumpFile(int fd,off_t dumpsize,off_t lasthd,char * buf,const char * device,const char * filename,FILE * fp)389 DoTextdumpFile(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
434 static void
DoFile(const char * savedir,const char * device)435 DoFile(const char *savedir, const char *device)
436 {
437 static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX];
438 static char *buf = NULL;
439 struct kerneldumpheader kdhf, kdhl;
440 off_t mediasize, dumpsize, firsthd, lasthd;
441 FILE *info, *fp;
442 mode_t oumask;
443 int fd, fdinfo, error;
444 int bounds, status;
445 u_int sectorsize;
446 int istextdump;
447
448 bounds = getbounds();
449 mediasize = 0;
450 status = STATUS_UNKNOWN;
451
452 if (maxdumps > 0 && bounds == maxdumps)
453 bounds = 0;
454
455 if (buf == NULL) {
456 buf = malloc(BUFFERSIZE);
457 if (buf == NULL) {
458 syslog(LOG_ERR, "%m");
459 return;
460 }
461 }
462
463 if (verbose)
464 printf("checking for kernel dump on device %s\n", device);
465
466 fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR);
467 if (fd < 0) {
468 syslog(LOG_ERR, "%s: %m", device);
469 return;
470 }
471
472 error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
473 if (!error)
474 error = ioctl(fd, DIOCGSECTORSIZE, §orsize);
475 if (error) {
476 syslog(LOG_ERR,
477 "couldn't find media and/or sector size of %s: %m", device);
478 goto closefd;
479 }
480
481 if (verbose) {
482 printf("mediasize = %lld\n", (long long)mediasize);
483 printf("sectorsize = %u\n", sectorsize);
484 }
485
486 lasthd = mediasize - sectorsize;
487 lseek(fd, lasthd, SEEK_SET);
488 error = read(fd, &kdhl, sizeof kdhl);
489 if (error != sizeof kdhl) {
490 syslog(LOG_ERR,
491 "error reading last dump header at offset %lld in %s: %m",
492 (long long)lasthd, device);
493 goto closefd;
494 }
495 istextdump = 0;
496 if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) {
497 if (verbose)
498 printf("textdump magic on last dump header on %s\n",
499 device);
500 istextdump = 1;
501 if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) {
502 syslog(LOG_ERR,
503 "unknown version (%d) in last dump header on %s",
504 dtoh32(kdhl.version), device);
505
506 status = STATUS_BAD;
507 if (force == 0)
508 goto closefd;
509 }
510 } else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) ==
511 0) {
512 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
513 syslog(LOG_ERR,
514 "unknown version (%d) in last dump header on %s",
515 dtoh32(kdhl.version), device);
516
517 status = STATUS_BAD;
518 if (force == 0)
519 goto closefd;
520 }
521 } else {
522 if (verbose)
523 printf("magic mismatch on last dump header on %s\n",
524 device);
525
526 status = STATUS_BAD;
527 if (force == 0)
528 goto closefd;
529
530 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
531 sizeof kdhl.magic) == 0) {
532 if (verbose)
533 printf("forcing magic on %s\n", device);
534 memcpy(kdhl.magic, KERNELDUMPMAGIC,
535 sizeof kdhl.magic);
536 } else {
537 syslog(LOG_ERR, "unable to force dump - bad magic");
538 goto closefd;
539 }
540 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
541 syslog(LOG_ERR,
542 "unknown version (%d) in last dump header on %s",
543 dtoh32(kdhl.version), device);
544
545 status = STATUS_BAD;
546 if (force == 0)
547 goto closefd;
548 }
549 }
550
551 nfound++;
552 if (clear)
553 goto nuke;
554
555 if (kerneldump_parity(&kdhl)) {
556 syslog(LOG_ERR,
557 "parity error on last dump header on %s", device);
558 nerr++;
559 status = STATUS_BAD;
560 if (force == 0)
561 goto closefd;
562 }
563 dumpsize = dtoh64(kdhl.dumplength);
564 firsthd = lasthd - dumpsize - sizeof kdhf;
565 lseek(fd, firsthd, SEEK_SET);
566 error = read(fd, &kdhf, sizeof kdhf);
567 if (error != sizeof kdhf) {
568 syslog(LOG_ERR,
569 "error reading first dump header at offset %lld in %s: %m",
570 (long long)firsthd, device);
571 nerr++;
572 goto closefd;
573 }
574
575 if (verbose >= 2) {
576 printf("First dump headers:\n");
577 printheader(stdout, &kdhf, device, bounds, -1);
578
579 printf("\nLast dump headers:\n");
580 printheader(stdout, &kdhl, device, bounds, -1);
581 printf("\n");
582 }
583
584 if (memcmp(&kdhl, &kdhf, sizeof kdhl)) {
585 syslog(LOG_ERR,
586 "first and last dump headers disagree on %s", device);
587 nerr++;
588 status = STATUS_BAD;
589 if (force == 0)
590 goto closefd;
591 } else {
592 status = STATUS_GOOD;
593 }
594
595 if (checkfor) {
596 printf("A dump exists on %s\n", device);
597 close(fd);
598 exit(0);
599 }
600
601 if (kdhl.panicstring[0])
602 syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring);
603 else
604 syslog(LOG_ALERT, "reboot");
605
606 if (verbose)
607 printf("Checking for available free space\n");
608
609 if (!check_space(savedir, dumpsize, bounds)) {
610 nerr++;
611 goto closefd;
612 }
613
614 writebounds(bounds + 1);
615
616 saved_dump_remove(bounds);
617
618 snprintf(infoname, sizeof(infoname), "info.%d", bounds);
619
620 /*
621 * Create or overwrite any existing dump header files.
622 */
623 fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600);
624 if (fdinfo < 0) {
625 syslog(LOG_ERR, "%s: %m", infoname);
626 nerr++;
627 goto closefd;
628 }
629 oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
630 if (compress) {
631 snprintf(corename, sizeof(corename), "%s.%d.gz",
632 istextdump ? "textdump.tar" : "vmcore", bounds);
633 fp = zopen(corename, "w");
634 } else {
635 snprintf(corename, sizeof(corename), "%s.%d",
636 istextdump ? "textdump.tar" : "vmcore", bounds);
637 fp = fopen(corename, "w");
638 }
639 if (fp == NULL) {
640 syslog(LOG_ERR, "%s: %m", corename);
641 close(fdinfo);
642 nerr++;
643 goto closefd;
644 }
645 (void)umask(oumask);
646
647 info = fdopen(fdinfo, "w");
648
649 if (info == NULL) {
650 syslog(LOG_ERR, "fdopen failed: %m");
651 nerr++;
652 goto closefd;
653 }
654
655 if (verbose)
656 printheader(stdout, &kdhl, device, bounds, status);
657
658 printheader(info, &kdhl, device, bounds, status);
659 fclose(info);
660
661 syslog(LOG_NOTICE, "writing %score to %s/%s",
662 compress ? "compressed " : "", savedir, corename);
663
664 if (istextdump) {
665 if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device,
666 corename, fp) < 0)
667 goto closeall;
668 } else {
669 if (DoRegularFile(fd, dumpsize, buf, device, corename, fp)
670 < 0)
671 goto closeall;
672 }
673 if (verbose)
674 printf("\n");
675
676 if (fclose(fp) < 0) {
677 syslog(LOG_ERR, "error on %s: %m", corename);
678 nerr++;
679 goto closefd;
680 }
681
682 symlinks_remove();
683 if (symlink(infoname, "info.last") == -1) {
684 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
685 savedir, "info.last");
686 }
687 if (compress) {
688 snprintf(linkname, sizeof(linkname), "%s.last.gz",
689 istextdump ? "textdump.tar" : "vmcore");
690 } else {
691 snprintf(linkname, sizeof(linkname), "%s.last",
692 istextdump ? "textdump.tar" : "vmcore");
693 }
694 if (symlink(corename, linkname) == -1) {
695 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
696 savedir, linkname);
697 }
698
699 symlinks_remove();
700 if (symlink(infoname, "info.last") == -1) {
701 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
702 savedir, "info.last");
703 }
704 if (compress) {
705 snprintf(linkname, sizeof(linkname), "%s.last.gz",
706 istextdump ? "textdump.tar" : "vmcore");
707 } else {
708 snprintf(linkname, sizeof(linkname), "%s.last",
709 istextdump ? "textdump.tar" : "vmcore");
710 }
711 if (symlink(corename, linkname) == -1) {
712 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
713 savedir, linkname);
714 }
715
716 nsaved++;
717
718 if (verbose)
719 printf("dump saved\n");
720
721 nuke:
722 if (!keep) {
723 if (verbose)
724 printf("clearing dump header\n");
725 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic);
726 lseek(fd, lasthd, SEEK_SET);
727 error = write(fd, &kdhl, sizeof kdhl);
728 if (error != sizeof kdhl)
729 syslog(LOG_ERR,
730 "error while clearing the dump header: %m");
731 }
732 close(fd);
733 return;
734
735 closeall:
736 fclose(fp);
737
738 closefd:
739 close(fd);
740 }
741
742 static void
usage(void)743 usage(void)
744 {
745 fprintf(stderr, "%s\n%s\n%s\n",
746 "usage: savecore -c [-v] [device ...]",
747 " savecore -C [-v] [device ...]",
748 " savecore [-fkvz] [-m maxdumps] [directory [device ...]]");
749 exit(1);
750 }
751
752 int
main(int argc,char ** argv)753 main(int argc, char **argv)
754 {
755 const char *savedir = ".";
756 struct fstab *fsp;
757 int i, ch, error;
758
759 checkfor = compress = clear = force = keep = verbose = 0;
760 nfound = nsaved = nerr = 0;
761
762 openlog("savecore", LOG_PERROR, LOG_DAEMON);
763 signal(SIGINFO, infohandler);
764
765 while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1)
766 switch(ch) {
767 case 'C':
768 checkfor = 1;
769 break;
770 case 'c':
771 clear = 1;
772 break;
773 case 'f':
774 force = 1;
775 break;
776 case 'k':
777 keep = 1;
778 break;
779 case 'm':
780 maxdumps = atoi(optarg);
781 if (maxdumps <= 0) {
782 syslog(LOG_ERR, "Invalid maxdump value");
783 exit(1);
784 }
785 break;
786 case 'v':
787 verbose++;
788 break;
789 case 'z':
790 compress = 1;
791 break;
792 case '?':
793 default:
794 usage();
795 }
796 if (checkfor && (clear || force || keep))
797 usage();
798 if (clear && (compress || keep))
799 usage();
800 if (maxdumps > 0 && (checkfor || clear))
801 usage();
802 argc -= optind;
803 argv += optind;
804 if (argc >= 1 && !checkfor && !clear) {
805 error = chdir(argv[0]);
806 if (error) {
807 syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
808 exit(1);
809 }
810 savedir = argv[0];
811 argc--;
812 argv++;
813 }
814 if (argc == 0) {
815 for (;;) {
816 fsp = getfsent();
817 if (fsp == NULL)
818 break;
819 if (strcmp(fsp->fs_vfstype, "swap") &&
820 strcmp(fsp->fs_vfstype, "dump"))
821 continue;
822 DoFile(savedir, fsp->fs_spec);
823 }
824 } else {
825 for (i = 0; i < argc; i++)
826 DoFile(savedir, argv[i]);
827 }
828
829 /* Emit minimal output. */
830 if (nfound == 0) {
831 if (checkfor) {
832 printf("No dump exists\n");
833 exit(1);
834 }
835 syslog(LOG_WARNING, "no dumps found");
836 }
837 else if (nsaved == 0) {
838 if (nerr != 0)
839 syslog(LOG_WARNING, "unsaved dumps found but not saved");
840 else
841 syslog(LOG_WARNING, "no unsaved dumps found");
842 }
843
844 return (0);
845 }
846
847 static void
infohandler(int sig __unused)848 infohandler(int sig __unused)
849 {
850 got_siginfo = 1;
851 }
852