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