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 #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 92 static int checkfor, compress, clear, force, keep, verbose; /* flags */ 93 static int nfound, nsaved, nerr; /* statistics */ 94 static int maxdumps; 95 96 extern FILE *zopen(const char *, const char *); 97 98 static sig_atomic_t got_siginfo; 99 static void infohandler(int); 100 101 static void 102 printheader(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 } 138 139 static int 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 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 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 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 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 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 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 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 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 435 DoFile(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; 440 char *temp = NULL; 441 struct kerneldumpheader kdhf, kdhl; 442 off_t mediasize, dumpsize, firsthd, lasthd; 443 FILE *info, *fp; 444 mode_t oumask; 445 int fd, fdinfo, error; 446 int bounds, status; 447 u_int sectorsize, xostyle; 448 int istextdump; 449 450 bounds = getbounds(); 451 mediasize = 0; 452 status = STATUS_UNKNOWN; 453 454 xostdout = xo_create_to_file(stdout, XO_STYLE_TEXT, 0); 455 if (xostdout == NULL) { 456 syslog(LOG_ERR, "%s: %m", infoname); 457 return; 458 } 459 460 if (maxdumps > 0 && bounds == maxdumps) 461 bounds = 0; 462 463 if (buf == NULL) { 464 buf = malloc(BUFFERSIZE); 465 if (buf == NULL) { 466 syslog(LOG_ERR, "%m"); 467 return; 468 } 469 } 470 471 if (verbose) 472 printf("checking for kernel dump on device %s\n", device); 473 474 fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR); 475 if (fd < 0) { 476 syslog(LOG_ERR, "%s: %m", device); 477 return; 478 } 479 480 error = ioctl(fd, DIOCGMEDIASIZE, &mediasize); 481 if (!error) 482 error = ioctl(fd, DIOCGSECTORSIZE, §orsize); 483 if (error) { 484 syslog(LOG_ERR, 485 "couldn't find media and/or sector size of %s: %m", device); 486 goto closefd; 487 } 488 489 if (verbose) { 490 printf("mediasize = %lld\n", (long long)mediasize); 491 printf("sectorsize = %u\n", sectorsize); 492 } 493 494 if (sectorsize < sizeof(kdhl)) { 495 syslog(LOG_ERR, 496 "Sector size is less the kernel dump header %zu", 497 sizeof(kdhl)); 498 goto closefd; 499 } 500 501 lasthd = mediasize - sectorsize; 502 temp = malloc(sectorsize); 503 if (temp == NULL) { 504 syslog(LOG_ERR, "%m"); 505 goto closefd; 506 } 507 if (lseek(fd, lasthd, SEEK_SET) != lasthd || 508 read(fd, temp, sectorsize) != (ssize_t)sectorsize) { 509 syslog(LOG_ERR, 510 "error reading last dump header at offset %lld in %s: %m", 511 (long long)lasthd, device); 512 goto closefd; 513 } 514 memcpy(&kdhl, temp, sizeof(kdhl)); 515 istextdump = 0; 516 if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) { 517 if (verbose) 518 printf("textdump magic on last dump header on %s\n", 519 device); 520 istextdump = 1; 521 if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) { 522 syslog(LOG_ERR, 523 "unknown version (%d) in last dump header on %s", 524 dtoh32(kdhl.version), device); 525 526 status = STATUS_BAD; 527 if (force == 0) 528 goto closefd; 529 } 530 } else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) == 531 0) { 532 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) { 533 syslog(LOG_ERR, 534 "unknown version (%d) in last dump header on %s", 535 dtoh32(kdhl.version), device); 536 537 status = STATUS_BAD; 538 if (force == 0) 539 goto closefd; 540 } 541 } else { 542 if (verbose) 543 printf("magic mismatch on last dump header on %s\n", 544 device); 545 546 status = STATUS_BAD; 547 if (force == 0) 548 goto closefd; 549 550 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED, 551 sizeof kdhl.magic) == 0) { 552 if (verbose) 553 printf("forcing magic on %s\n", device); 554 memcpy(kdhl.magic, KERNELDUMPMAGIC, 555 sizeof kdhl.magic); 556 } else { 557 syslog(LOG_ERR, "unable to force dump - bad magic"); 558 goto closefd; 559 } 560 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) { 561 syslog(LOG_ERR, 562 "unknown version (%d) in last dump header on %s", 563 dtoh32(kdhl.version), device); 564 565 status = STATUS_BAD; 566 if (force == 0) 567 goto closefd; 568 } 569 } 570 571 nfound++; 572 if (clear) 573 goto nuke; 574 575 if (kerneldump_parity(&kdhl)) { 576 syslog(LOG_ERR, 577 "parity error on last dump header on %s", device); 578 nerr++; 579 status = STATUS_BAD; 580 if (force == 0) 581 goto closefd; 582 } 583 dumpsize = dtoh64(kdhl.dumplength); 584 firsthd = lasthd - dumpsize - sectorsize; 585 if (lseek(fd, firsthd, SEEK_SET) != firsthd || 586 read(fd, temp, sectorsize) != (ssize_t)sectorsize) { 587 syslog(LOG_ERR, 588 "error reading first dump header at offset %lld in %s: %m", 589 (long long)firsthd, device); 590 nerr++; 591 goto closefd; 592 } 593 memcpy(&kdhf, temp, sizeof(kdhf)); 594 595 if (verbose >= 2) { 596 printf("First dump headers:\n"); 597 printheader(xostdout, &kdhf, device, bounds, -1); 598 599 printf("\nLast dump headers:\n"); 600 printheader(xostdout, &kdhl, device, bounds, -1); 601 printf("\n"); 602 } 603 604 if (memcmp(&kdhl, &kdhf, sizeof(kdhl))) { 605 syslog(LOG_ERR, 606 "first and last dump headers disagree on %s", device); 607 nerr++; 608 status = STATUS_BAD; 609 if (force == 0) 610 goto closefd; 611 } else { 612 status = STATUS_GOOD; 613 } 614 615 if (checkfor) { 616 printf("A dump exists on %s\n", device); 617 close(fd); 618 exit(0); 619 } 620 621 if (kdhl.panicstring[0] != '\0') 622 syslog(LOG_ALERT, "reboot after panic: %*s", 623 (int)sizeof(kdhl.panicstring), kdhl.panicstring); 624 else 625 syslog(LOG_ALERT, "reboot"); 626 627 if (verbose) 628 printf("Checking for available free space\n"); 629 630 if (!check_space(savedir, dumpsize, bounds)) { 631 nerr++; 632 goto closefd; 633 } 634 635 writebounds(bounds + 1); 636 637 saved_dump_remove(bounds); 638 639 snprintf(infoname, sizeof(infoname), "info.%d", bounds); 640 641 /* 642 * Create or overwrite any existing dump header files. 643 */ 644 fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600); 645 if (fdinfo < 0) { 646 syslog(LOG_ERR, "%s: %m", infoname); 647 nerr++; 648 goto closefd; 649 } 650 651 oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/ 652 if (compress) { 653 snprintf(corename, sizeof(corename), "%s.%d.gz", 654 istextdump ? "textdump.tar" : "vmcore", bounds); 655 fp = zopen(corename, "w"); 656 } else { 657 snprintf(corename, sizeof(corename), "%s.%d", 658 istextdump ? "textdump.tar" : "vmcore", bounds); 659 fp = fopen(corename, "w"); 660 } 661 if (fp == NULL) { 662 syslog(LOG_ERR, "%s: %m", corename); 663 close(fdinfo); 664 nerr++; 665 goto closefd; 666 } 667 (void)umask(oumask); 668 669 info = fdopen(fdinfo, "w"); 670 671 if (info == NULL) { 672 syslog(LOG_ERR, "fdopen failed: %m"); 673 nerr++; 674 goto closeall; 675 } 676 677 xostyle = xo_get_style(NULL); 678 xoinfo = xo_create_to_file(info, xostyle, 0); 679 if (xoinfo == NULL) { 680 syslog(LOG_ERR, "%s: %m", infoname); 681 nerr++; 682 goto closeall; 683 } 684 xo_open_container_h(xoinfo, "crashdump"); 685 686 if (verbose) 687 printheader(xostdout, &kdhl, device, bounds, status); 688 689 printheader(xoinfo, &kdhl, device, bounds, status); 690 xo_close_container_h(xoinfo, "crashdump"); 691 xo_flush_h(xoinfo); 692 xo_finish_h(xoinfo); 693 fclose(info); 694 695 syslog(LOG_NOTICE, "writing %score to %s/%s", 696 compress ? "compressed " : "", savedir, corename); 697 698 if (istextdump) { 699 if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device, 700 corename, fp) < 0) 701 goto closeall; 702 } else { 703 if (DoRegularFile(fd, dumpsize, buf, device, corename, fp) 704 < 0) 705 goto closeall; 706 } 707 if (verbose) 708 printf("\n"); 709 710 if (fclose(fp) < 0) { 711 syslog(LOG_ERR, "error on %s: %m", corename); 712 nerr++; 713 goto closefd; 714 } 715 716 symlinks_remove(); 717 if (symlink(infoname, "info.last") == -1) { 718 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m", 719 savedir, "info.last"); 720 } 721 if (compress) { 722 snprintf(linkname, sizeof(linkname), "%s.last.gz", 723 istextdump ? "textdump.tar" : "vmcore"); 724 } else { 725 snprintf(linkname, sizeof(linkname), "%s.last", 726 istextdump ? "textdump.tar" : "vmcore"); 727 } 728 if (symlink(corename, linkname) == -1) { 729 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m", 730 savedir, linkname); 731 } 732 733 nsaved++; 734 735 if (verbose) 736 printf("dump saved\n"); 737 738 nuke: 739 if (!keep) { 740 if (verbose) 741 printf("clearing dump header\n"); 742 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof(kdhl.magic)); 743 memcpy(temp, &kdhl, sizeof(kdhl)); 744 if (lseek(fd, lasthd, SEEK_SET) != lasthd || 745 write(fd, temp, sectorsize) != (ssize_t)sectorsize) 746 syslog(LOG_ERR, 747 "error while clearing the dump header: %m"); 748 } 749 xo_close_container_h(xostdout, "crashdump"); 750 xo_finish_h(xostdout); 751 free(temp); 752 close(fd); 753 return; 754 755 closeall: 756 fclose(fp); 757 758 closefd: 759 free(temp); 760 close(fd); 761 } 762 763 static void 764 usage(void) 765 { 766 xo_error("%s\n%s\n%s\n", 767 "usage: savecore -c [-v] [device ...]", 768 " savecore -C [-v] [device ...]", 769 " savecore [-fkvz] [-m maxdumps] [directory [device ...]]"); 770 exit(1); 771 } 772 773 int 774 main(int argc, char **argv) 775 { 776 const char *savedir = "."; 777 struct fstab *fsp; 778 int i, ch, error; 779 780 checkfor = compress = clear = force = keep = verbose = 0; 781 nfound = nsaved = nerr = 0; 782 783 openlog("savecore", LOG_PERROR, LOG_DAEMON); 784 signal(SIGINFO, infohandler); 785 786 argc = xo_parse_args(argc, argv); 787 if (argc < 0) 788 exit(1); 789 790 while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1) 791 switch(ch) { 792 case 'C': 793 checkfor = 1; 794 break; 795 case 'c': 796 clear = 1; 797 break; 798 case 'f': 799 force = 1; 800 break; 801 case 'k': 802 keep = 1; 803 break; 804 case 'm': 805 maxdumps = atoi(optarg); 806 if (maxdumps <= 0) { 807 syslog(LOG_ERR, "Invalid maxdump value"); 808 exit(1); 809 } 810 break; 811 case 'v': 812 verbose++; 813 break; 814 case 'z': 815 compress = 1; 816 break; 817 case '?': 818 default: 819 usage(); 820 } 821 if (checkfor && (clear || force || keep)) 822 usage(); 823 if (clear && (compress || keep)) 824 usage(); 825 if (maxdumps > 0 && (checkfor || clear)) 826 usage(); 827 argc -= optind; 828 argv += optind; 829 if (argc >= 1 && !checkfor && !clear) { 830 error = chdir(argv[0]); 831 if (error) { 832 syslog(LOG_ERR, "chdir(%s): %m", argv[0]); 833 exit(1); 834 } 835 savedir = argv[0]; 836 argc--; 837 argv++; 838 } 839 if (argc == 0) { 840 for (;;) { 841 fsp = getfsent(); 842 if (fsp == NULL) 843 break; 844 if (strcmp(fsp->fs_vfstype, "swap") && 845 strcmp(fsp->fs_vfstype, "dump")) 846 continue; 847 DoFile(savedir, fsp->fs_spec); 848 } 849 endfsent(); 850 } else { 851 for (i = 0; i < argc; i++) 852 DoFile(savedir, argv[i]); 853 } 854 855 /* Emit minimal output. */ 856 if (nfound == 0) { 857 if (checkfor) { 858 if (verbose) 859 printf("No dump exists\n"); 860 exit(1); 861 } 862 if (verbose) 863 syslog(LOG_WARNING, "no dumps found"); 864 } else if (nsaved == 0) { 865 if (nerr != 0) { 866 if (verbose) 867 syslog(LOG_WARNING, "unsaved dumps found but not saved"); 868 exit(1); 869 } else if (verbose) 870 syslog(LOG_WARNING, "no unsaved dumps found"); 871 } 872 873 return (0); 874 } 875 876 static void 877 infohandler(int sig __unused) 878 { 879 got_siginfo = 1; 880 } 881