2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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
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
35 * Copyright (c) 1986, 1992, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67 #include <sys/cdefs.h>
68 __FBSDID("$FreeBSD$");
70 #include <sys/param.h>
72 #include <sys/kerneldump.h>
73 #include <sys/param.h>
74 #include <sys/mount.h>
88 /* The size of the buffer used for I/O. */
89 #define BUFFERSIZE (1024*1024)
91 static int checkfor, compress, clear, force, keep, verbose; /* flags */
92 static int nfound, nsaved, nerr; /* statistics */
94 extern FILE *zopen(const char *, const char *);
97 printheader(FILE *f, const struct kerneldumpheader *h, const char *device,
103 fprintf(f, "Good dump found on device %s\n", device);
104 fprintf(f, " Architecture: %s\n", h->architecture);
105 fprintf(f, " Architecture version: %d\n",
106 dtoh32(h->architectureversion));
107 dumplen = dtoh64(h->dumplength);
108 fprintf(f, " Dump length: %lldB (%lld MB)\n", (long long)dumplen,
109 (long long)(dumplen >> 20));
110 fprintf(f, " Blocksize: %d\n", dtoh32(h->blocksize));
111 t = dtoh64(h->dumptime);
112 fprintf(f, " Dumptime: %s", ctime(&t));
113 fprintf(f, " Hostname: %s\n", h->hostname);
114 fprintf(f, " Versionstring: %s", h->versionstring);
115 fprintf(f, " Panicstring: %s\n", h->panicstring);
116 fprintf(f, " Bounds: %d\n", bounds);
128 if ((fp = fopen("bounds", "r")) == NULL) {
129 syslog(LOG_WARNING, "unable to open bounds file, using 0");
133 if (fgets(buf, sizeof buf, fp) == NULL) {
134 syslog(LOG_WARNING, "unable to read from bounds, using 0");
140 ret = (int)strtol(buf, NULL, 10);
141 if (ret == 0 && (errno == EINVAL || errno == ERANGE))
142 syslog(LOG_WARNING, "invalid value found in bounds, using 0");
146 if ((fp = fopen("bounds", "w")) == NULL) {
147 syslog(LOG_WARNING, "unable to write to bounds file: %m");
152 printf("bounds number: %d\n", ret);
154 fprintf(fp, "%d\n", (ret + 1));
162 * Check that sufficient space is available on the disk that holds the
166 check_space(char *savedir, off_t dumpsize)
169 off_t minfree, spacefree, totfree, needed;
171 char buf[100], path[MAXPATHLEN];
173 if (statfs(savedir, &fsbuf) < 0) {
174 syslog(LOG_ERR, "%s: %m", savedir);
177 spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
178 totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;
180 (void)snprintf(path, sizeof(path), "%s/minfree", savedir);
181 if ((fp = fopen(path, "r")) == NULL)
184 if (fgets(buf, sizeof(buf), fp) == NULL)
191 needed = dumpsize / 1024 + 2; /* 2 for info file */
192 if (((minfree > 0) ? spacefree : totfree) - needed < minfree) {
194 "no dump, not enough free space on device (%lld available, need %lld)",
195 (long long)(minfree > 0 ? spacefree : totfree),
199 if (spacefree - needed < 0)
201 "dump performed, but free space threshold crossed");
205 #define BLOCKSIZE (1<<12)
206 #define BLOCKMASK (~(BLOCKSIZE-1))
209 DoFile(char *savedir, const char *device)
211 static char *buf = NULL;
212 struct kerneldumpheader kdhf, kdhl;
213 off_t mediasize, dumpsize, firsthd, lasthd, dmpcnt;
215 int fd, fdinfo, error, wl;
216 int nr, nw, hs, he = 0;
225 buf = malloc(BUFFERSIZE);
227 syslog(LOG_ERR, "%m");
233 printf("checking for kernel dump on device %s\n", device);
235 fd = open(device, O_RDWR);
237 syslog(LOG_ERR, "%s: %m", device);
241 error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
243 error = ioctl(fd, DIOCGSECTORSIZE, §orsize);
246 "couldn't find media and/or sector size of %s: %m", device);
251 printf("mediasize = %lld\n", (long long)mediasize);
252 printf("sectorsize = %u\n", sectorsize);
255 lasthd = mediasize - sectorsize;
256 lseek(fd, lasthd, SEEK_SET);
257 error = read(fd, &kdhl, sizeof kdhl);
258 if (error != sizeof kdhl) {
260 "error reading last dump header at offset %lld in %s: %m",
261 (long long)lasthd, device);
264 if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic)) {
266 printf("magic mismatch on last dump header on %s\n",
272 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
273 sizeof kdhl.magic) == 0) {
275 printf("forcing magic on %s\n", device);
276 memcpy(kdhl.magic, KERNELDUMPMAGIC,
279 syslog(LOG_ERR, "unable to force dump - bad magic");
283 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
285 "unknown version (%d) in last dump header on %s",
286 dtoh32(kdhl.version), device);
294 if (kerneldump_parity(&kdhl)) {
296 "parity error on last dump header on %s", device);
300 dumpsize = dtoh64(kdhl.dumplength);
301 firsthd = lasthd - dumpsize - sizeof kdhf;
302 lseek(fd, firsthd, SEEK_SET);
303 error = read(fd, &kdhf, sizeof kdhf);
304 if (error != sizeof kdhf) {
306 "error reading first dump header at offset %lld in %s: %m",
307 (long long)firsthd, device);
311 if (memcmp(&kdhl, &kdhf, sizeof kdhl)) {
313 "first and last dump headers disagree on %s", device);
319 printf("A dump exists on %s\n", device);
324 if (kdhl.panicstring[0])
325 syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring);
327 syslog(LOG_ALERT, "reboot");
330 printf("Checking for available free space\n");
331 if (!check_space(savedir, dumpsize)) {
336 bounds = getbounds();
338 sprintf(buf, "info.%d", bounds);
341 * Create or overwrite any existing files.
343 fdinfo = open(buf, O_WRONLY | O_CREAT | O_TRUNC, 0600);
345 syslog(LOG_ERR, "%s: %m", buf);
349 oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
351 sprintf(buf, "vmcore.%d.gz", bounds);
352 fp = zopen(buf, "w");
354 sprintf(buf, "vmcore.%d", bounds);
355 fp = fopen(buf, "w");
358 syslog(LOG_ERR, "%s: %m", buf);
365 info = fdopen(fdinfo, "w");
368 printheader(stdout, &kdhl, device, bounds);
370 printheader(info, &kdhl, device, bounds);
373 syslog(LOG_NOTICE, "writing %score to %s",
374 compress ? "compressed " : "", buf);
376 while (dumpsize > 0) {
380 nr = read(fd, buf, wl);
384 "WARNING: EOF on dump device");
386 syslog(LOG_ERR, "read error on %s: %m", device);
391 nw = fwrite(buf, 1, wl, fp);
393 for (nw = 0; nw < nr; nw = he) {
394 /* find a contiguous block of zeroes */
395 for (hs = nw; hs < nr; hs += BLOCKSIZE) {
396 for (he = hs; he < nr && buf[he] == 0; ++he)
398 /* is the hole long enough to matter? */
399 if (he >= hs + BLOCKSIZE)
403 /* back down to a block boundary */
407 * 1) Don't go beyond the end of the buffer.
408 * 2) If the end of the buffer is less than
409 * BLOCKSIZE bytes away, we're at the end
410 * of the file, so just grab what's left.
412 if (hs + BLOCKSIZE > nr)
416 * At this point, we have a partial ordering:
417 * nw <= hs <= he <= nr
418 * If hs > nw, buf[nw..hs] contains non-zero data.
419 * If he > hs, buf[hs..he] is all zeroes.
422 if (fwrite(buf + nw, hs - nw, 1, fp) != 1)
425 if (fseeko(fp, he - hs, SEEK_CUR) == -1)
431 "write error on vmcore.%d file: %m", bounds);
433 "WARNING: vmcore may be incomplete");
439 printf("%llu\r", (unsigned long long)dmpcnt);
447 if (fclose(fp) < 0) {
448 syslog(LOG_ERR, "error on vmcore.%d: %m", bounds);
455 printf("dump saved\n");
458 if (clear || !keep) {
460 printf("clearing dump header\n");
461 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic);
462 lseek(fd, lasthd, SEEK_SET);
463 error = write(fd, &kdhl, sizeof kdhl);
464 if (error != sizeof kdhl)
466 "error while clearing the dump header: %m");
481 fprintf(stderr, "%s\n%s\n%s\n",
482 "usage: savecore -c",
483 " savecore -C [-v] [directory device]",
484 " savecore [-fkvz] [directory [device ...]]");
489 main(int argc, char **argv)
495 openlog("savecore", LOG_PERROR, LOG_DAEMON);
497 savedir = strdup(".");
498 if (savedir == NULL) {
499 syslog(LOG_ERR, "Cannot allocate memory");
502 while ((ch = getopt(argc, argv, "Ccfkvz")) != -1)
526 if (checkfor && (clear || force || keep))
531 error = chdir(argv[0]);
533 syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
545 if (strcmp(fsp->fs_vfstype, "swap") &&
546 strcmp(fsp->fs_vfstype, "dump"))
548 DoFile(savedir, fsp->fs_spec);
551 for (i = 0; i < argc; i++)
552 DoFile(savedir, argv[i]);
555 /* Emit minimal output. */
558 printf("No dump exists\n");
561 syslog(LOG_WARNING, "no dumps found");
563 else if (nsaved == 0) {
565 syslog(LOG_WARNING, "unsaved dumps found but not saved");
567 syslog(LOG_WARNING, "no unsaved dumps found");