savecore.c revision 264806
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: stable/10/sbin/savecore/savecore.c 264806 2014-04-23 07:33:51Z brueffer $"); 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 91static int checkfor, compress, clear, force, keep, verbose; /* flags */ 92static int nfound, nsaved, nerr; /* statistics */ 93static int maxdumps; 94 95extern FILE *zopen(const char *, const char *); 96 97static sig_atomic_t got_siginfo; 98static void infohandler(int); 99 100static void 101printheader(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 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 syslog(LOG_WARNING, "unable to read from bounds, using 0"); 155 fclose(fp); 156 return (ret); 157 } 158 159 errno = 0; 160 ret = (int)strtol(buf, NULL, 10); 161 if (ret == 0 && (errno == EINVAL || errno == ERANGE)) 162 syslog(LOG_WARNING, "invalid value found in bounds, using 0"); 163 return (ret); 164} 165 166static void 167writebounds(int bounds) { 168 FILE *fp; 169 170 if ((fp = fopen("bounds", "w")) == NULL) { 171 syslog(LOG_WARNING, "unable to write to bounds file: %m"); 172 return; 173 } 174 175 if (verbose) 176 printf("bounds number: %d\n", bounds); 177 178 fprintf(fp, "%d\n", bounds); 179 fclose(fp); 180} 181 182static off_t 183file_size(const char *path) 184{ 185 struct stat sb; 186 187 /* Ignore all errors, those file may not exists. */ 188 if (stat(path, &sb) == -1) 189 return (0); 190 return (sb.st_size); 191} 192 193static off_t 194saved_dump_size(int bounds) 195{ 196 static char path[PATH_MAX]; 197 off_t dumpsize; 198 199 dumpsize = 0; 200 201 (void)snprintf(path, sizeof(path), "info.%d", bounds); 202 dumpsize += file_size(path); 203 (void)snprintf(path, sizeof(path), "vmcore.%d", bounds); 204 dumpsize += file_size(path); 205 (void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds); 206 dumpsize += file_size(path); 207 (void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds); 208 dumpsize += file_size(path); 209 (void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds); 210 dumpsize += file_size(path); 211 212 return (dumpsize); 213} 214 215static void 216saved_dump_remove(int bounds) 217{ 218 static char path[PATH_MAX]; 219 220 (void)snprintf(path, sizeof(path), "info.%d", bounds); 221 (void)unlink(path); 222 (void)snprintf(path, sizeof(path), "vmcore.%d", bounds); 223 (void)unlink(path); 224 (void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds); 225 (void)unlink(path); 226 (void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds); 227 (void)unlink(path); 228 (void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds); 229 (void)unlink(path); 230} 231 232static void 233symlinks_remove(void) 234{ 235 236 (void)unlink("info.last"); 237 (void)unlink("vmcore.last"); 238 (void)unlink("vmcore.last.gz"); 239 (void)unlink("textdump.tar.last"); 240 (void)unlink("textdump.tar.last.gz"); 241} 242 243/* 244 * Check that sufficient space is available on the disk that holds the 245 * save directory. 246 */ 247static int 248check_space(const char *savedir, off_t dumpsize, int bounds) 249{ 250 FILE *fp; 251 off_t minfree, spacefree, totfree, needed; 252 struct statfs fsbuf; 253 char buf[100]; 254 255 if (statfs(".", &fsbuf) < 0) { 256 syslog(LOG_ERR, "%s: %m", savedir); 257 exit(1); 258 } 259 spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024; 260 totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024; 261 262 if ((fp = fopen("minfree", "r")) == NULL) 263 minfree = 0; 264 else { 265 if (fgets(buf, sizeof(buf), fp) == NULL) 266 minfree = 0; 267 else 268 minfree = atoi(buf); 269 (void)fclose(fp); 270 } 271 272 needed = dumpsize / 1024 + 2; /* 2 for info file */ 273 needed -= saved_dump_size(bounds); 274 if ((minfree > 0 ? spacefree : totfree) - needed < minfree) { 275 syslog(LOG_WARNING, 276 "no dump, not enough free space on device (%lld available, need %lld)", 277 (long long)(minfree > 0 ? spacefree : totfree), 278 (long long)needed); 279 return (0); 280 } 281 if (spacefree - needed < 0) 282 syslog(LOG_WARNING, 283 "dump performed, but free space threshold crossed"); 284 return (1); 285} 286 287#define BLOCKSIZE (1<<12) 288#define BLOCKMASK (~(BLOCKSIZE-1)) 289 290static int 291DoRegularFile(int fd, off_t dumpsize, char *buf, const char *device, 292 const char *filename, FILE *fp) 293{ 294 int he, hs, nr, nw, wl; 295 off_t dmpcnt, origsize; 296 297 dmpcnt = 0; 298 origsize = dumpsize; 299 he = 0; 300 while (dumpsize > 0) { 301 wl = BUFFERSIZE; 302 if (wl > dumpsize) 303 wl = dumpsize; 304 nr = read(fd, buf, wl); 305 if (nr != wl) { 306 if (nr == 0) 307 syslog(LOG_WARNING, 308 "WARNING: EOF on dump device"); 309 else 310 syslog(LOG_ERR, "read error on %s: %m", device); 311 nerr++; 312 return (-1); 313 } 314 if (compress) { 315 nw = fwrite(buf, 1, wl, fp); 316 } else { 317 for (nw = 0; nw < nr; nw = he) { 318 /* find a contiguous block of zeroes */ 319 for (hs = nw; hs < nr; hs += BLOCKSIZE) { 320 for (he = hs; he < nr && buf[he] == 0; 321 ++he) 322 /* nothing */ ; 323 /* is the hole long enough to matter? */ 324 if (he >= hs + BLOCKSIZE) 325 break; 326 } 327 328 /* back down to a block boundary */ 329 he &= BLOCKMASK; 330 331 /* 332 * 1) Don't go beyond the end of the buffer. 333 * 2) If the end of the buffer is less than 334 * BLOCKSIZE bytes away, we're at the end 335 * of the file, so just grab what's left. 336 */ 337 if (hs + BLOCKSIZE > nr) 338 hs = he = nr; 339 340 /* 341 * At this point, we have a partial ordering: 342 * nw <= hs <= he <= nr 343 * If hs > nw, buf[nw..hs] contains non-zero data. 344 * If he > hs, buf[hs..he] is all zeroes. 345 */ 346 if (hs > nw) 347 if (fwrite(buf + nw, hs - nw, 1, fp) 348 != 1) 349 break; 350 if (he > hs) 351 if (fseeko(fp, he - hs, SEEK_CUR) == -1) 352 break; 353 } 354 } 355 if (nw != wl) { 356 syslog(LOG_ERR, 357 "write error on %s file: %m", filename); 358 syslog(LOG_WARNING, 359 "WARNING: vmcore may be incomplete"); 360 nerr++; 361 return (-1); 362 } 363 if (verbose) { 364 dmpcnt += wl; 365 printf("%llu\r", (unsigned long long)dmpcnt); 366 fflush(stdout); 367 } 368 dumpsize -= wl; 369 if (got_siginfo) { 370 printf("%s %.1lf%%\n", filename, (100.0 - (100.0 * 371 (double)dumpsize / (double)origsize))); 372 got_siginfo = 0; 373 } 374 } 375 return (0); 376} 377 378/* 379 * Specialized version of dump-reading logic for use with textdumps, which 380 * are written backwards from the end of the partition, and must be reversed 381 * before being written to the file. Textdumps are small, so do a bit less 382 * work to optimize/sparsify. 383 */ 384static int 385DoTextdumpFile(int fd, off_t dumpsize, off_t lasthd, char *buf, 386 const char *device, const char *filename, FILE *fp) 387{ 388 int nr, nw, wl; 389 off_t dmpcnt, totsize; 390 391 totsize = dumpsize; 392 dmpcnt = 0; 393 wl = 512; 394 if ((dumpsize % wl) != 0) { 395 syslog(LOG_ERR, "textdump uneven multiple of 512 on %s", 396 device); 397 nerr++; 398 return (-1); 399 } 400 while (dumpsize > 0) { 401 nr = pread(fd, buf, wl, lasthd - (totsize - dumpsize) - wl); 402 if (nr != wl) { 403 if (nr == 0) 404 syslog(LOG_WARNING, 405 "WARNING: EOF on dump device"); 406 else 407 syslog(LOG_ERR, "read error on %s: %m", device); 408 nerr++; 409 return (-1); 410 } 411 nw = fwrite(buf, 1, wl, fp); 412 if (nw != wl) { 413 syslog(LOG_ERR, 414 "write error on %s file: %m", filename); 415 syslog(LOG_WARNING, 416 "WARNING: textdump may be incomplete"); 417 nerr++; 418 return (-1); 419 } 420 if (verbose) { 421 dmpcnt += wl; 422 printf("%llu\r", (unsigned long long)dmpcnt); 423 fflush(stdout); 424 } 425 dumpsize -= wl; 426 } 427 return (0); 428} 429 430static void 431DoFile(const char *savedir, const char *device) 432{ 433 static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX]; 434 static char *buf = NULL; 435 struct kerneldumpheader kdhf, kdhl; 436 off_t mediasize, dumpsize, firsthd, lasthd; 437 FILE *info, *fp; 438 mode_t oumask; 439 int fd, fdinfo, error; 440 int bounds, status; 441 u_int sectorsize; 442 int istextdump; 443 444 bounds = getbounds(); 445 mediasize = 0; 446 status = STATUS_UNKNOWN; 447 448 if (maxdumps > 0 && bounds == maxdumps) 449 bounds = 0; 450 451 if (buf == NULL) { 452 buf = malloc(BUFFERSIZE); 453 if (buf == NULL) { 454 syslog(LOG_ERR, "%m"); 455 return; 456 } 457 } 458 459 if (verbose) 460 printf("checking for kernel dump on device %s\n", device); 461 462 fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR); 463 if (fd < 0) { 464 syslog(LOG_ERR, "%s: %m", device); 465 return; 466 } 467 468 error = ioctl(fd, DIOCGMEDIASIZE, &mediasize); 469 if (!error) 470 error = ioctl(fd, DIOCGSECTORSIZE, §orsize); 471 if (error) { 472 syslog(LOG_ERR, 473 "couldn't find media and/or sector size of %s: %m", device); 474 goto closefd; 475 } 476 477 if (verbose) { 478 printf("mediasize = %lld\n", (long long)mediasize); 479 printf("sectorsize = %u\n", sectorsize); 480 } 481 482 lasthd = mediasize - sectorsize; 483 lseek(fd, lasthd, SEEK_SET); 484 error = read(fd, &kdhl, sizeof kdhl); 485 if (error != sizeof kdhl) { 486 syslog(LOG_ERR, 487 "error reading last dump header at offset %lld in %s: %m", 488 (long long)lasthd, device); 489 goto closefd; 490 } 491 istextdump = 0; 492 if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) { 493 if (verbose) 494 printf("textdump magic on last dump header on %s\n", 495 device); 496 istextdump = 1; 497 if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) { 498 syslog(LOG_ERR, 499 "unknown version (%d) in last dump header on %s", 500 dtoh32(kdhl.version), device); 501 502 status = STATUS_BAD; 503 if (force == 0) 504 goto closefd; 505 } 506 } else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) == 507 0) { 508 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) { 509 syslog(LOG_ERR, 510 "unknown version (%d) in last dump header on %s", 511 dtoh32(kdhl.version), device); 512 513 status = STATUS_BAD; 514 if (force == 0) 515 goto closefd; 516 } 517 } else { 518 if (verbose) 519 printf("magic mismatch on last dump header on %s\n", 520 device); 521 522 status = STATUS_BAD; 523 if (force == 0) 524 goto closefd; 525 526 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED, 527 sizeof kdhl.magic) == 0) { 528 if (verbose) 529 printf("forcing magic on %s\n", device); 530 memcpy(kdhl.magic, KERNELDUMPMAGIC, 531 sizeof kdhl.magic); 532 } else { 533 syslog(LOG_ERR, "unable to force dump - bad magic"); 534 goto closefd; 535 } 536 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) { 537 syslog(LOG_ERR, 538 "unknown version (%d) in last dump header on %s", 539 dtoh32(kdhl.version), device); 540 541 status = STATUS_BAD; 542 if (force == 0) 543 goto closefd; 544 } 545 } 546 547 nfound++; 548 if (clear) 549 goto nuke; 550 551 if (kerneldump_parity(&kdhl)) { 552 syslog(LOG_ERR, 553 "parity error on last dump header on %s", device); 554 nerr++; 555 status = STATUS_BAD; 556 if (force == 0) 557 goto closefd; 558 } 559 dumpsize = dtoh64(kdhl.dumplength); 560 firsthd = lasthd - dumpsize - sizeof kdhf; 561 lseek(fd, firsthd, SEEK_SET); 562 error = read(fd, &kdhf, sizeof kdhf); 563 if (error != sizeof kdhf) { 564 syslog(LOG_ERR, 565 "error reading first dump header at offset %lld in %s: %m", 566 (long long)firsthd, device); 567 nerr++; 568 goto closefd; 569 } 570 571 if (verbose >= 2) { 572 printf("First dump headers:\n"); 573 printheader(stdout, &kdhf, device, bounds, -1); 574 575 printf("\nLast dump headers:\n"); 576 printheader(stdout, &kdhl, device, bounds, -1); 577 printf("\n"); 578 } 579 580 if (memcmp(&kdhl, &kdhf, sizeof kdhl)) { 581 syslog(LOG_ERR, 582 "first and last dump headers disagree on %s", device); 583 nerr++; 584 status = STATUS_BAD; 585 if (force == 0) 586 goto closefd; 587 } else { 588 status = STATUS_GOOD; 589 } 590 591 if (checkfor) { 592 printf("A dump exists on %s\n", device); 593 close(fd); 594 exit(0); 595 } 596 597 if (kdhl.panicstring[0]) 598 syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring); 599 else 600 syslog(LOG_ALERT, "reboot"); 601 602 if (verbose) 603 printf("Checking for available free space\n"); 604 605 if (!check_space(savedir, dumpsize, bounds)) { 606 nerr++; 607 goto closefd; 608 } 609 610 writebounds(bounds + 1); 611 612 saved_dump_remove(bounds); 613 614 snprintf(infoname, sizeof(infoname), "info.%d", bounds); 615 616 /* 617 * Create or overwrite any existing dump header files. 618 */ 619 fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600); 620 if (fdinfo < 0) { 621 syslog(LOG_ERR, "%s: %m", buf); 622 nerr++; 623 goto closefd; 624 } 625 oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/ 626 if (compress) { 627 snprintf(corename, sizeof(corename), "%s.%d.gz", 628 istextdump ? "textdump.tar" : "vmcore", bounds); 629 fp = zopen(corename, "w"); 630 } else { 631 snprintf(corename, sizeof(corename), "%s.%d", 632 istextdump ? "textdump.tar" : "vmcore", bounds); 633 fp = fopen(corename, "w"); 634 } 635 if (fp == NULL) { 636 syslog(LOG_ERR, "%s: %m", corename); 637 close(fdinfo); 638 nerr++; 639 goto closefd; 640 } 641 (void)umask(oumask); 642 643 info = fdopen(fdinfo, "w"); 644 645 if (info == NULL) { 646 syslog(LOG_ERR, "fdopen failed: %m"); 647 nerr++; 648 goto closefd; 649 } 650 651 if (verbose) 652 printheader(stdout, &kdhl, device, bounds, status); 653 654 printheader(info, &kdhl, device, bounds, status); 655 fclose(info); 656 657 syslog(LOG_NOTICE, "writing %score to %s/%s", 658 compress ? "compressed " : "", savedir, corename); 659 660 if (istextdump) { 661 if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device, 662 corename, fp) < 0) 663 goto closeall; 664 } else { 665 if (DoRegularFile(fd, dumpsize, buf, device, corename, fp) 666 < 0) 667 goto closeall; 668 } 669 if (verbose) 670 printf("\n"); 671 672 if (fclose(fp) < 0) { 673 syslog(LOG_ERR, "error on %s: %m", corename); 674 nerr++; 675 goto closefd; 676 } 677 678 symlinks_remove(); 679 if (symlink(infoname, "info.last") == -1) { 680 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m", 681 savedir, "info.last"); 682 } 683 if (compress) { 684 snprintf(linkname, sizeof(linkname), "%s.last.gz", 685 istextdump ? "textdump.tar" : "vmcore"); 686 } else { 687 snprintf(linkname, sizeof(linkname), "%s.last", 688 istextdump ? "textdump.tar" : "vmcore"); 689 } 690 if (symlink(corename, linkname) == -1) { 691 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m", 692 savedir, linkname); 693 } 694 695 nsaved++; 696 697 if (verbose) 698 printf("dump saved\n"); 699 700nuke: 701 if (!keep) { 702 if (verbose) 703 printf("clearing dump header\n"); 704 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic); 705 lseek(fd, lasthd, SEEK_SET); 706 error = write(fd, &kdhl, sizeof kdhl); 707 if (error != sizeof kdhl) 708 syslog(LOG_ERR, 709 "error while clearing the dump header: %m"); 710 } 711 close(fd); 712 return; 713 714closeall: 715 fclose(fp); 716 717closefd: 718 close(fd); 719} 720 721static void 722usage(void) 723{ 724 fprintf(stderr, "%s\n%s\n%s\n", 725 "usage: savecore -c [-v] [device ...]", 726 " savecore -C [-v] [device ...]", 727 " savecore [-fkvz] [-m maxdumps] [directory [device ...]]"); 728 exit(1); 729} 730 731int 732main(int argc, char **argv) 733{ 734 const char *savedir = "."; 735 struct fstab *fsp; 736 int i, ch, error; 737 738 checkfor = compress = clear = force = keep = verbose = 0; 739 nfound = nsaved = nerr = 0; 740 741 openlog("savecore", LOG_PERROR, LOG_DAEMON); 742 signal(SIGINFO, infohandler); 743 744 while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1) 745 switch(ch) { 746 case 'C': 747 checkfor = 1; 748 break; 749 case 'c': 750 clear = 1; 751 break; 752 case 'f': 753 force = 1; 754 break; 755 case 'k': 756 keep = 1; 757 break; 758 case 'm': 759 maxdumps = atoi(optarg); 760 if (maxdumps <= 0) { 761 syslog(LOG_ERR, "Invalid maxdump value"); 762 exit(1); 763 } 764 break; 765 case 'v': 766 verbose++; 767 break; 768 case 'z': 769 compress = 1; 770 break; 771 case '?': 772 default: 773 usage(); 774 } 775 if (checkfor && (clear || force || keep)) 776 usage(); 777 if (clear && (compress || keep)) 778 usage(); 779 if (maxdumps > 0 && (checkfor || clear)) 780 usage(); 781 argc -= optind; 782 argv += optind; 783 if (argc >= 1 && !checkfor && !clear) { 784 error = chdir(argv[0]); 785 if (error) { 786 syslog(LOG_ERR, "chdir(%s): %m", argv[0]); 787 exit(1); 788 } 789 savedir = argv[0]; 790 argc--; 791 argv++; 792 } 793 if (argc == 0) { 794 for (;;) { 795 fsp = getfsent(); 796 if (fsp == NULL) 797 break; 798 if (strcmp(fsp->fs_vfstype, "swap") && 799 strcmp(fsp->fs_vfstype, "dump")) 800 continue; 801 DoFile(savedir, fsp->fs_spec); 802 } 803 } else { 804 for (i = 0; i < argc; i++) 805 DoFile(savedir, argv[i]); 806 } 807 808 /* Emit minimal output. */ 809 if (nfound == 0) { 810 if (checkfor) { 811 printf("No dump exists\n"); 812 exit(1); 813 } 814 syslog(LOG_WARNING, "no dumps found"); 815 } 816 else if (nsaved == 0) { 817 if (nerr != 0) 818 syslog(LOG_WARNING, "unsaved dumps found but not saved"); 819 else 820 syslog(LOG_WARNING, "no unsaved dumps found"); 821 } 822 823 return (0); 824} 825 826static void 827infohandler(int sig __unused) 828{ 829 got_siginfo = 1; 830} 831