savecore.c revision 319305
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 319305 2017-05-31 08:42:44Z 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 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 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 (%lldkB " 281 "available; need at least %lldkB)", 282 (long long)(minfree > 0 ? spacefree : totfree), 283 (long long)needed); 284 return (0); 285 } 286 if (spacefree - needed < 0) 287 syslog(LOG_WARNING, 288 "dump performed, but free space threshold crossed"); 289 return (1); 290} 291 292#define BLOCKSIZE (1<<12) 293#define BLOCKMASK (~(BLOCKSIZE-1)) 294 295static int 296DoRegularFile(int fd, off_t dumpsize, char *buf, const char *device, 297 const char *filename, FILE *fp) 298{ 299 int he, hs, nr, nw, wl; 300 off_t dmpcnt, origsize; 301 302 dmpcnt = 0; 303 origsize = dumpsize; 304 he = 0; 305 while (dumpsize > 0) { 306 wl = BUFFERSIZE; 307 if (wl > dumpsize) 308 wl = dumpsize; 309 nr = read(fd, buf, wl); 310 if (nr != wl) { 311 if (nr == 0) 312 syslog(LOG_WARNING, 313 "WARNING: EOF on dump device"); 314 else 315 syslog(LOG_ERR, "read error on %s: %m", device); 316 nerr++; 317 return (-1); 318 } 319 if (compress) { 320 nw = fwrite(buf, 1, wl, fp); 321 } else { 322 for (nw = 0; nw < nr; nw = he) { 323 /* find a contiguous block of zeroes */ 324 for (hs = nw; hs < nr; hs += BLOCKSIZE) { 325 for (he = hs; he < nr && buf[he] == 0; 326 ++he) 327 /* nothing */ ; 328 /* is the hole long enough to matter? */ 329 if (he >= hs + BLOCKSIZE) 330 break; 331 } 332 333 /* back down to a block boundary */ 334 he &= BLOCKMASK; 335 336 /* 337 * 1) Don't go beyond the end of the buffer. 338 * 2) If the end of the buffer is less than 339 * BLOCKSIZE bytes away, we're at the end 340 * of the file, so just grab what's left. 341 */ 342 if (hs + BLOCKSIZE > nr) 343 hs = he = nr; 344 345 /* 346 * At this point, we have a partial ordering: 347 * nw <= hs <= he <= nr 348 * If hs > nw, buf[nw..hs] contains non-zero data. 349 * If he > hs, buf[hs..he] is all zeroes. 350 */ 351 if (hs > nw) 352 if (fwrite(buf + nw, hs - nw, 1, fp) 353 != 1) 354 break; 355 if (he > hs) 356 if (fseeko(fp, he - hs, SEEK_CUR) == -1) 357 break; 358 } 359 } 360 if (nw != wl) { 361 syslog(LOG_ERR, 362 "write error on %s file: %m", filename); 363 syslog(LOG_WARNING, 364 "WARNING: vmcore may be incomplete"); 365 nerr++; 366 return (-1); 367 } 368 if (verbose) { 369 dmpcnt += wl; 370 printf("%llu\r", (unsigned long long)dmpcnt); 371 fflush(stdout); 372 } 373 dumpsize -= wl; 374 if (got_siginfo) { 375 printf("%s %.1lf%%\n", filename, (100.0 - (100.0 * 376 (double)dumpsize / (double)origsize))); 377 got_siginfo = 0; 378 } 379 } 380 return (0); 381} 382 383/* 384 * Specialized version of dump-reading logic for use with textdumps, which 385 * are written backwards from the end of the partition, and must be reversed 386 * before being written to the file. Textdumps are small, so do a bit less 387 * work to optimize/sparsify. 388 */ 389static int 390DoTextdumpFile(int fd, off_t dumpsize, off_t lasthd, char *buf, 391 const char *device, const char *filename, FILE *fp) 392{ 393 int nr, nw, wl; 394 off_t dmpcnt, totsize; 395 396 totsize = dumpsize; 397 dmpcnt = 0; 398 wl = 512; 399 if ((dumpsize % wl) != 0) { 400 syslog(LOG_ERR, "textdump uneven multiple of 512 on %s", 401 device); 402 nerr++; 403 return (-1); 404 } 405 while (dumpsize > 0) { 406 nr = pread(fd, buf, wl, lasthd - (totsize - dumpsize) - wl); 407 if (nr != wl) { 408 if (nr == 0) 409 syslog(LOG_WARNING, 410 "WARNING: EOF on dump device"); 411 else 412 syslog(LOG_ERR, "read error on %s: %m", device); 413 nerr++; 414 return (-1); 415 } 416 nw = fwrite(buf, 1, wl, fp); 417 if (nw != wl) { 418 syslog(LOG_ERR, 419 "write error on %s file: %m", filename); 420 syslog(LOG_WARNING, 421 "WARNING: textdump may be incomplete"); 422 nerr++; 423 return (-1); 424 } 425 if (verbose) { 426 dmpcnt += wl; 427 printf("%llu\r", (unsigned long long)dmpcnt); 428 fflush(stdout); 429 } 430 dumpsize -= wl; 431 } 432 return (0); 433} 434 435static void 436DoFile(const char *savedir, const char *device) 437{ 438 static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX]; 439 static char *buf = 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; 447 int istextdump; 448 449 bounds = getbounds(); 450 mediasize = 0; 451 status = STATUS_UNKNOWN; 452 453 if (maxdumps > 0 && bounds == maxdumps) 454 bounds = 0; 455 456 if (buf == NULL) { 457 buf = malloc(BUFFERSIZE); 458 if (buf == NULL) { 459 syslog(LOG_ERR, "%m"); 460 return; 461 } 462 } 463 464 if (verbose) 465 printf("checking for kernel dump on device %s\n", device); 466 467 fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR); 468 if (fd < 0) { 469 syslog(LOG_ERR, "%s: %m", device); 470 return; 471 } 472 473 error = ioctl(fd, DIOCGMEDIASIZE, &mediasize); 474 if (!error) 475 error = ioctl(fd, DIOCGSECTORSIZE, §orsize); 476 if (error) { 477 syslog(LOG_ERR, 478 "couldn't find media and/or sector size of %s: %m", device); 479 goto closefd; 480 } 481 482 if (verbose) { 483 printf("mediasize = %lld\n", (long long)mediasize); 484 printf("sectorsize = %u\n", sectorsize); 485 } 486 487 lasthd = mediasize - sectorsize; 488 lseek(fd, lasthd, SEEK_SET); 489 error = read(fd, &kdhl, sizeof kdhl); 490 if (error != sizeof kdhl) { 491 syslog(LOG_ERR, 492 "error reading last dump header at offset %lld in %s: %m", 493 (long long)lasthd, device); 494 goto closefd; 495 } 496 istextdump = 0; 497 if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) { 498 if (verbose) 499 printf("textdump magic on last dump header on %s\n", 500 device); 501 istextdump = 1; 502 if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) { 503 syslog(LOG_ERR, 504 "unknown version (%d) in last dump header on %s", 505 dtoh32(kdhl.version), device); 506 507 status = STATUS_BAD; 508 if (force == 0) 509 goto closefd; 510 } 511 } else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) == 512 0) { 513 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) { 514 syslog(LOG_ERR, 515 "unknown version (%d) in last dump header on %s", 516 dtoh32(kdhl.version), device); 517 518 status = STATUS_BAD; 519 if (force == 0) 520 goto closefd; 521 } 522 } else { 523 if (verbose) 524 printf("magic mismatch on last dump header on %s\n", 525 device); 526 527 status = STATUS_BAD; 528 if (force == 0) 529 goto closefd; 530 531 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED, 532 sizeof kdhl.magic) == 0) { 533 if (verbose) 534 printf("forcing magic on %s\n", device); 535 memcpy(kdhl.magic, KERNELDUMPMAGIC, 536 sizeof kdhl.magic); 537 } else { 538 syslog(LOG_ERR, "unable to force dump - bad magic"); 539 goto closefd; 540 } 541 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) { 542 syslog(LOG_ERR, 543 "unknown version (%d) in last dump header on %s", 544 dtoh32(kdhl.version), device); 545 546 status = STATUS_BAD; 547 if (force == 0) 548 goto closefd; 549 } 550 } 551 552 nfound++; 553 if (clear) 554 goto nuke; 555 556 if (kerneldump_parity(&kdhl)) { 557 syslog(LOG_ERR, 558 "parity error on last dump header on %s", device); 559 nerr++; 560 status = STATUS_BAD; 561 if (force == 0) 562 goto closefd; 563 } 564 dumpsize = dtoh64(kdhl.dumplength); 565 firsthd = lasthd - dumpsize - sizeof kdhf; 566 lseek(fd, firsthd, SEEK_SET); 567 error = read(fd, &kdhf, sizeof kdhf); 568 if (error != sizeof kdhf) { 569 syslog(LOG_ERR, 570 "error reading first dump header at offset %lld in %s: %m", 571 (long long)firsthd, device); 572 nerr++; 573 goto closefd; 574 } 575 576 if (verbose >= 2) { 577 printf("First dump headers:\n"); 578 printheader(stdout, &kdhf, device, bounds, -1); 579 580 printf("\nLast dump headers:\n"); 581 printheader(stdout, &kdhl, device, bounds, -1); 582 printf("\n"); 583 } 584 585 if (memcmp(&kdhl, &kdhf, sizeof kdhl)) { 586 syslog(LOG_ERR, 587 "first and last dump headers disagree on %s", device); 588 nerr++; 589 status = STATUS_BAD; 590 if (force == 0) 591 goto closefd; 592 } else { 593 status = STATUS_GOOD; 594 } 595 596 if (checkfor) { 597 printf("A dump exists on %s\n", device); 598 close(fd); 599 exit(0); 600 } 601 602 if (kdhl.panicstring[0]) 603 syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring); 604 else 605 syslog(LOG_ALERT, "reboot"); 606 607 if (verbose) 608 printf("Checking for available free space\n"); 609 610 if (!check_space(savedir, dumpsize, bounds)) { 611 nerr++; 612 goto closefd; 613 } 614 615 writebounds(bounds + 1); 616 617 saved_dump_remove(bounds); 618 619 snprintf(infoname, sizeof(infoname), "info.%d", bounds); 620 621 /* 622 * Create or overwrite any existing dump header files. 623 */ 624 fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600); 625 if (fdinfo < 0) { 626 syslog(LOG_ERR, "%s: %m", infoname); 627 nerr++; 628 goto closefd; 629 } 630 oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/ 631 if (compress) { 632 snprintf(corename, sizeof(corename), "%s.%d.gz", 633 istextdump ? "textdump.tar" : "vmcore", bounds); 634 fp = zopen(corename, "w"); 635 } else { 636 snprintf(corename, sizeof(corename), "%s.%d", 637 istextdump ? "textdump.tar" : "vmcore", bounds); 638 fp = fopen(corename, "w"); 639 } 640 if (fp == NULL) { 641 syslog(LOG_ERR, "%s: %m", corename); 642 close(fdinfo); 643 nerr++; 644 goto closefd; 645 } 646 (void)umask(oumask); 647 648 info = fdopen(fdinfo, "w"); 649 650 if (info == NULL) { 651 syslog(LOG_ERR, "fdopen failed: %m"); 652 nerr++; 653 goto closefd; 654 } 655 656 if (verbose) 657 printheader(stdout, &kdhl, device, bounds, status); 658 659 printheader(info, &kdhl, device, bounds, status); 660 fclose(info); 661 662 syslog(LOG_NOTICE, "writing %score to %s/%s", 663 compress ? "compressed " : "", savedir, corename); 664 665 if (istextdump) { 666 if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device, 667 corename, fp) < 0) 668 goto closeall; 669 } else { 670 if (DoRegularFile(fd, dumpsize, buf, device, corename, fp) 671 < 0) 672 goto closeall; 673 } 674 if (verbose) 675 printf("\n"); 676 677 if (fclose(fp) < 0) { 678 syslog(LOG_ERR, "error on %s: %m", corename); 679 nerr++; 680 goto closefd; 681 } 682 683 symlinks_remove(); 684 if (symlink(infoname, "info.last") == -1) { 685 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m", 686 savedir, "info.last"); 687 } 688 if (compress) { 689 snprintf(linkname, sizeof(linkname), "%s.last.gz", 690 istextdump ? "textdump.tar" : "vmcore"); 691 } else { 692 snprintf(linkname, sizeof(linkname), "%s.last", 693 istextdump ? "textdump.tar" : "vmcore"); 694 } 695 if (symlink(corename, linkname) == -1) { 696 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m", 697 savedir, linkname); 698 } 699 700 nsaved++; 701 702 if (verbose) 703 printf("dump saved\n"); 704 705nuke: 706 if (!keep) { 707 if (verbose) 708 printf("clearing dump header\n"); 709 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic); 710 lseek(fd, lasthd, SEEK_SET); 711 error = write(fd, &kdhl, sizeof kdhl); 712 if (error != sizeof kdhl) 713 syslog(LOG_ERR, 714 "error while clearing the dump header: %m"); 715 } 716 close(fd); 717 return; 718 719closeall: 720 fclose(fp); 721 722closefd: 723 close(fd); 724} 725 726static void 727usage(void) 728{ 729 fprintf(stderr, "%s\n%s\n%s\n", 730 "usage: savecore -c [-v] [device ...]", 731 " savecore -C [-v] [device ...]", 732 " savecore [-fkvz] [-m maxdumps] [directory [device ...]]"); 733 exit(1); 734} 735 736int 737main(int argc, char **argv) 738{ 739 const char *savedir = "."; 740 struct fstab *fsp; 741 int i, ch, error; 742 743 checkfor = compress = clear = force = keep = verbose = 0; 744 nfound = nsaved = nerr = 0; 745 746 openlog("savecore", LOG_PERROR, LOG_DAEMON); 747 signal(SIGINFO, infohandler); 748 749 while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1) 750 switch(ch) { 751 case 'C': 752 checkfor = 1; 753 break; 754 case 'c': 755 clear = 1; 756 break; 757 case 'f': 758 force = 1; 759 break; 760 case 'k': 761 keep = 1; 762 break; 763 case 'm': 764 maxdumps = atoi(optarg); 765 if (maxdumps <= 0) { 766 syslog(LOG_ERR, "Invalid maxdump value"); 767 exit(1); 768 } 769 break; 770 case 'v': 771 verbose++; 772 break; 773 case 'z': 774 compress = 1; 775 break; 776 case '?': 777 default: 778 usage(); 779 } 780 if (checkfor && (clear || force || keep)) 781 usage(); 782 if (clear && (compress || keep)) 783 usage(); 784 if (maxdumps > 0 && (checkfor || clear)) 785 usage(); 786 argc -= optind; 787 argv += optind; 788 if (argc >= 1 && !checkfor && !clear) { 789 error = chdir(argv[0]); 790 if (error) { 791 syslog(LOG_ERR, "chdir(%s): %m", argv[0]); 792 exit(1); 793 } 794 savedir = argv[0]; 795 argc--; 796 argv++; 797 } 798 if (argc == 0) { 799 for (;;) { 800 fsp = getfsent(); 801 if (fsp == NULL) 802 break; 803 if (strcmp(fsp->fs_vfstype, "swap") && 804 strcmp(fsp->fs_vfstype, "dump")) 805 continue; 806 DoFile(savedir, fsp->fs_spec); 807 } 808 } else { 809 for (i = 0; i < argc; i++) 810 DoFile(savedir, argv[i]); 811 } 812 813 /* Emit minimal output. */ 814 if (nfound == 0) { 815 if (checkfor) { 816 printf("No dump exists\n"); 817 exit(1); 818 } 819 syslog(LOG_WARNING, "no dumps found"); 820 } 821 else if (nsaved == 0) { 822 if (nerr != 0) 823 syslog(LOG_WARNING, "unsaved dumps found but not saved"); 824 else 825 syslog(LOG_WARNING, "no unsaved dumps found"); 826 } 827 828 return (0); 829} 830 831static void 832infohandler(int sig __unused) 833{ 834 got_siginfo = 1; 835} 836