savecore.c revision 1.65.6.1
1 /* $NetBSD: savecore.c,v 1.65.6.1 2006/02/04 15:52:36 simonb Exp $ */ 2 3 /*- 4 * Copyright (c) 1986, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1986, 1992, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)savecore.c 8.5 (Berkeley) 4/28/95"; 41 #else 42 __RCSID("$NetBSD: savecore.c,v 1.65.6.1 2006/02/04 15:52:36 simonb Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/mount.h> 48 #include <sys/msgbuf.h> 49 #include <sys/syslog.h> 50 #include <sys/time.h> 51 52 #include <dirent.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <nlist.h> 56 #include <paths.h> 57 #include <stddef.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <time.h> 62 #include <tzfile.h> 63 #include <unistd.h> 64 #include <util.h> 65 #include <limits.h> 66 #include <kvm.h> 67 68 extern FILE *zopen(const char *fname, const char *mode); 69 70 #define KREAD(kd, addr, p)\ 71 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 72 73 struct nlist current_nl[] = { /* Namelist for currently running system. */ 74 #define X_DUMPDEV 0 75 { "_dumpdev" }, 76 #define X_DUMPLO 1 77 { "_dumplo" }, 78 #define X_TIME_SECOND 2 79 #ifdef __HAVE_TIMECOUNTER 80 { "_time_second" }, 81 #else 82 { "_time" }, /* XXX uses same array slot as "X_TIME_SECOND" */ 83 #endif 84 #define X_DUMPSIZE 3 85 { "_dumpsize" }, 86 #define X_VERSION 4 87 { "_version" }, 88 #define X_DUMPMAG 5 89 { "_dumpmag" }, 90 #define X_PANICSTR 6 91 { "_panicstr" }, 92 #define X_PANICSTART 7 93 { "_panicstart" }, 94 #define X_PANICEND 8 95 { "_panicend" }, 96 #define X_MSGBUF 9 97 { "_msgbufp" }, 98 { NULL }, 99 }; 100 int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 }; 101 int dumpsyms[] = { X_TIME_SECOND, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, 102 -1 }; 103 104 struct nlist dump_nl[] = { /* Name list for dumped system. */ 105 { "_dumpdev" }, /* Entries MUST be the same as */ 106 { "_dumplo" }, /* those in current_nl[]. */ 107 #ifdef __HAVE_TIMECOUNTER 108 { "_time_second" }, 109 #else 110 { "_time" }, /* XXX uses same array slot as "X_TIME_SECOND" */ 111 #endif 112 { "_dumpsize" }, 113 { "_version" }, 114 { "_dumpmag" }, 115 { "_panicstr" }, 116 { "_panicstart" }, 117 { "_panicend" }, 118 { "_msgbufp" }, 119 { NULL }, 120 }; 121 122 /* Types match kernel declarations. */ 123 off_t dumplo; /* where dump starts on dumpdev */ 124 u_int32_t dumpmag; /* magic number in dump */ 125 int dumpsize; /* amount of memory dumped */ 126 off_t dumpbytes; /* in bytes */ 127 128 const char *kernel; /* name of used kernel */ 129 char *dirname; /* directory to save dumps in */ 130 char *ddname; /* name of dump device */ 131 dev_t dumpdev; /* dump device */ 132 int dumpfd; /* read/write descriptor on block dev */ 133 kvm_t *kd_dump; /* kvm descriptor on block dev */ 134 time_t now; /* current date */ 135 char panic_mesg[1024]; 136 long panicstr; 137 char vers[1024]; 138 char gzmode[3]; 139 140 static int clear, compress, force, verbose; /* flags */ 141 142 void check_kmem(void); 143 int check_space(void); 144 void clear_dump(void); 145 int Create(char *, int); 146 int dump_exists(void); 147 char *find_dev(dev_t, int); 148 int get_crashtime(void); 149 void kmem_setup(void); 150 void Lseek(int, off_t, int); 151 int main(int, char *[]); 152 int Open(const char *, int rw); 153 char *rawname(char *s); 154 void save_core(void); 155 void usage(void); 156 void Write(int, void *, int); 157 158 int 159 main(int argc, char *argv[]) 160 { 161 int ch, level, testonly; 162 char *ep; 163 164 dirname = NULL; 165 kernel = NULL; 166 level = 1; /* default to fastest gzip compression */ 167 testonly = 0; 168 gzmode[0] = 'w'; 169 170 openlog("savecore", LOG_PERROR, LOG_DAEMON); 171 172 while ((ch = getopt(argc, argv, "cdfnN:vzZ:")) != -1) 173 switch(ch) { 174 case 'c': 175 clear = 1; 176 break; 177 case 'd': /* Not documented. */ 178 case 'v': 179 verbose = 1; 180 break; 181 case 'f': 182 force = 1; 183 break; 184 case 'n': 185 testonly = 1; 186 break; 187 case 'N': 188 kernel = optarg; 189 break; 190 case 'z': 191 compress = 1; 192 break; 193 case 'Z': 194 level = (int)strtol(optarg, &ep, 10); 195 if (level < 0 || level > 9) { 196 (void)syslog(LOG_ERR, "invalid compression %s", 197 optarg); 198 usage(); 199 } 200 break; 201 case '?': 202 default: 203 usage(); 204 } 205 argc -= optind; 206 argv += optind; 207 208 if (argc != ((clear || testonly) ? 0 : 1)) 209 usage(); 210 211 gzmode[1] = level + '0'; 212 if (!clear) 213 dirname = argv[0]; 214 215 if (kernel == NULL) { 216 kernel = getbootfile(); 217 } 218 219 (void)time(&now); 220 kmem_setup(); 221 222 if (clear && !testonly) { 223 clear_dump(); 224 exit(0); 225 } 226 227 if (!dump_exists() && !force) 228 exit(1); 229 230 if (testonly) 231 /* If -n was passed and there was a dump, exit at level 0 */ 232 exit(0); 233 234 check_kmem(); 235 236 if (panicstr) 237 syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); 238 else 239 syslog(LOG_ALERT, "reboot"); 240 241 if ((!get_crashtime() || !check_space()) && !force) 242 exit(1); 243 244 save_core(); 245 246 clear_dump(); 247 exit(0); 248 } 249 250 void 251 kmem_setup(void) 252 { 253 kvm_t *kd_kern; 254 char errbuf[_POSIX2_LINE_MAX]; 255 int i, hdrsz; 256 257 /* 258 * Some names we need for the currently running system, others for 259 * the system that was running when the dump was made. The values 260 * obtained from the current system are used to look for things in 261 * /dev/kmem that cannot be found in the kernel namelist, but are 262 * presumed to be the same (since the disk partitions are probably 263 * the same!) 264 */ 265 kd_kern = kvm_openfiles(kernel, NULL, NULL, O_RDONLY, errbuf); 266 if (kd_kern == NULL) { 267 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 268 exit(1); 269 } 270 if (kvm_nlist(kd_kern, current_nl) == -1) 271 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 272 kvm_geterr(kd_kern)); 273 274 for (i = 0; cursyms[i] != -1; i++) 275 if (current_nl[cursyms[i]].n_value == 0) { 276 syslog(LOG_ERR, "%s: %s not in namelist", 277 kernel, current_nl[cursyms[i]].n_name); 278 exit(1); 279 } 280 281 if (KREAD(kd_kern, current_nl[X_DUMPDEV].n_value, &dumpdev) != 0) { 282 if (verbose) 283 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 284 exit(1); 285 } 286 if (dumpdev == NODEV) { 287 syslog(LOG_WARNING, "no core dump (no dumpdev)"); 288 exit(1); 289 } 290 { 291 long l_dumplo; 292 293 if (KREAD(kd_kern, current_nl[X_DUMPLO].n_value, &l_dumplo) != 0) { 294 if (verbose) 295 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 296 exit(1); 297 } 298 if (l_dumplo == -1) { 299 syslog(LOG_WARNING, "no core dump (invalid dumplo)"); 300 exit(1); 301 } 302 dumplo = DEV_BSIZE * (off_t) l_dumplo; 303 } 304 305 if (verbose) 306 (void)printf("dumplo = %lld (%ld * %ld)\n", 307 (long long)dumplo, (long)(dumplo / DEV_BSIZE), (long)DEV_BSIZE); 308 if (KREAD(kd_kern, current_nl[X_DUMPMAG].n_value, &dumpmag) != 0) { 309 if (verbose) 310 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 311 exit(1); 312 } 313 314 (void)kvm_read(kd_kern, current_nl[X_VERSION].n_value, vers, 315 sizeof(vers)); 316 vers[sizeof(vers) - 1] = '\0'; 317 318 ddname = find_dev(dumpdev, S_IFBLK); 319 dumpfd = Open(ddname, O_RDWR); 320 321 kd_dump = kvm_openfiles(kernel, ddname, NULL, O_RDWR, errbuf); 322 if (kd_dump == NULL) { 323 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 324 exit(1); 325 } 326 327 if (kvm_nlist(kd_dump, dump_nl) == -1) 328 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 329 kvm_geterr(kd_dump)); 330 331 for (i = 0; dumpsyms[i] != -1; i++) 332 if (dump_nl[dumpsyms[i]].n_value == 0) { 333 syslog(LOG_ERR, "%s: %s not in namelist", 334 kernel, dump_nl[dumpsyms[i]].n_name); 335 exit(1); 336 } 337 hdrsz = kvm_dump_mkheader(kd_dump, dumplo); 338 339 /* 340 * If 'hdrsz' == 0, kvm_dump_mkheader() failed on the magic-number 341 * checks, ergo no dump is present... 342 */ 343 if (hdrsz == 0) { 344 syslog(LOG_WARNING, "no core dump"); 345 exit(1); 346 } 347 if (hdrsz == -1) { 348 syslog(LOG_ERR, "%s: kvm_dump_mkheader: %s", kernel, 349 kvm_geterr(kd_dump)); 350 exit(1); 351 } 352 dumplo += hdrsz; 353 kvm_close(kd_kern); 354 } 355 356 void 357 check_kmem(void) 358 { 359 char *cp, *bufdata; 360 struct kern_msgbuf msgbuf, *bufp; 361 long panicloc, panicstart, panicend; 362 char core_vers[1024]; 363 364 (void)kvm_read(kd_dump, dump_nl[X_VERSION].n_value, core_vers, 365 sizeof(core_vers)); 366 core_vers[sizeof(core_vers) - 1] = '\0'; 367 368 if (strcmp(vers, core_vers) != 0) 369 syslog(LOG_WARNING, 370 "warning: %s version mismatch:\n\t%s\nand\t%s\n", 371 kernel, vers, core_vers); 372 373 panicstart = panicend = 0; 374 if (KREAD(kd_dump, dump_nl[X_PANICSTART].n_value, &panicstart) != 0) { 375 if (verbose) 376 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 377 goto nomsguf; 378 } 379 if (KREAD(kd_dump, dump_nl[X_PANICEND].n_value, &panicend) != 0) { 380 if (verbose) 381 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 382 goto nomsguf; 383 } 384 if (panicstart != 0 && panicend != 0) { 385 if (KREAD(kd_dump, dump_nl[X_MSGBUF].n_value, &bufp)) { 386 if (verbose) 387 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 388 goto nomsguf; 389 } 390 if (kvm_read(kd_dump, (long)bufp, &msgbuf, 391 offsetof(struct kern_msgbuf, msg_bufc)) != 392 offsetof(struct kern_msgbuf, msg_bufc)) { 393 if (verbose) 394 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 395 goto nomsguf; 396 } 397 if (msgbuf.msg_magic != MSG_MAGIC) { 398 if (verbose) 399 syslog(LOG_WARNING, "msgbuf magic incorrect"); 400 goto nomsguf; 401 } 402 bufdata = malloc(msgbuf.msg_bufs); 403 if (bufdata == NULL) { 404 if (verbose) 405 syslog(LOG_WARNING, "couldn't allocate space for msgbuf data"); 406 goto nomsguf; 407 } 408 if (kvm_read(kd_dump, (long)&bufp->msg_bufc, bufdata, 409 msgbuf.msg_bufs) != msgbuf.msg_bufs) { 410 if (verbose) 411 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 412 goto nomsguf; 413 } 414 cp = panic_mesg; 415 while (panicstart != panicend && cp < &panic_mesg[sizeof(panic_mesg)-1]) { 416 *cp++ = bufdata[panicstart]; 417 panicstart++; 418 if (panicstart >= msgbuf.msg_bufs) 419 panicstart = 0; 420 } 421 /* Don't end in a new-line */ 422 cp = &panic_mesg[strlen(panic_mesg)] - 1; 423 if (*cp == '\n') 424 *cp = '\0'; 425 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 426 427 panicstr = 1; /* anything not zero */ 428 return; 429 } 430 nomsguf: 431 if (KREAD(kd_dump, dump_nl[X_PANICSTR].n_value, &panicstr) != 0) { 432 if (verbose) 433 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 434 return; 435 } 436 if (panicstr) { 437 cp = panic_mesg; 438 panicloc = panicstr; 439 do { 440 if (KREAD(kd_dump, panicloc, cp) != 0) { 441 if (verbose) 442 syslog(LOG_WARNING, "kvm_read: %s", 443 kvm_geterr(kd_dump)); 444 break; 445 } 446 panicloc++; 447 } while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)-1]); 448 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 449 } 450 } 451 452 int 453 dump_exists(void) 454 { 455 u_int32_t newdumpmag; 456 457 if (KREAD(kd_dump, dump_nl[X_DUMPMAG].n_value, &newdumpmag) != 0) { 458 if (verbose) 459 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 460 return (0); 461 } 462 463 /* Read the dump size. */ 464 if (KREAD(kd_dump, dump_nl[X_DUMPSIZE].n_value, &dumpsize) != 0) { 465 if (verbose) 466 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 467 return (0); 468 } 469 dumpbytes = (off_t)dumpsize * getpagesize(); 470 471 /* 472 * Return zero if core dump doesn't seem to be there, and note 473 * it for syslog. This check and return happens after the dump size 474 * is read, so dumpsize is whether or not the core is valid (for -f). 475 */ 476 if (newdumpmag != dumpmag) { 477 if (verbose) 478 syslog(LOG_WARNING, 479 "magic number mismatch (0x%x != 0x%x)", 480 newdumpmag, dumpmag); 481 syslog(LOG_WARNING, "no core dump"); 482 return (0); 483 } 484 return (1); 485 } 486 487 void 488 clear_dump(void) 489 { 490 if (kvm_dump_inval(kd_dump) == -1) 491 syslog(LOG_ERR, "%s: kvm_clear_dump: %s", ddname, 492 kvm_geterr(kd_dump)); 493 494 } 495 496 char buf[1024 * 1024]; 497 498 void 499 save_core(void) 500 { 501 FILE *fp; 502 int bounds, ifd, nr, nw, ofd; 503 char *rawp, path[MAXPATHLEN]; 504 505 ofd = -1; 506 /* 507 * Get the current number and update the bounds file. Do the update 508 * now, because may fail later and don't want to overwrite anything. 509 */ 510 umask(066); 511 (void)snprintf(path, sizeof(path), "%s/bounds", dirname); 512 if ((fp = fopen(path, "r")) == NULL) 513 goto err1; 514 if (fgets(buf, sizeof(buf), fp) == NULL) { 515 if (ferror(fp)) 516 err1: syslog(LOG_WARNING, "%s: %m", path); 517 bounds = 0; 518 } else 519 bounds = atoi(buf); 520 if (fp != NULL) 521 (void)fclose(fp); 522 if ((fp = fopen(path, "w")) == NULL) 523 syslog(LOG_ERR, "%s: %m", path); 524 else { 525 (void)fprintf(fp, "%d\n", bounds + 1); 526 (void)fclose(fp); 527 } 528 529 /* Create the core file. */ 530 (void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s", 531 dirname, bounds, compress ? ".gz" : ""); 532 if (compress) { 533 if ((fp = zopen(path, gzmode)) == NULL) { 534 syslog(LOG_ERR, "%s: %m", path); 535 exit(1); 536 } 537 } else { 538 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 539 fp = fdopen(ofd, "w"); 540 if (fp == NULL) { 541 syslog(LOG_ERR, "%s: fdopen: %m", path); 542 exit(1); 543 } 544 } 545 546 /* Open the raw device. */ 547 rawp = rawname(ddname); 548 if ((ifd = open(rawp, O_RDONLY)) == -1) { 549 syslog(LOG_WARNING, "%s: %m; using block device", rawp); 550 ifd = dumpfd; 551 } 552 553 /* Seek to the start of the core. */ 554 Lseek(ifd, dumplo, SEEK_SET); 555 556 if (kvm_dump_wrtheader(kd_dump, fp, (int32_t)dumpbytes) == -1) { 557 syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path, 558 kvm_geterr(kd_dump)); 559 exit(1); 560 } 561 562 /* Copy the core file. */ 563 syslog(LOG_NOTICE, "writing %score to %s", 564 compress ? "compressed " : "", path); 565 for (; dumpbytes > (off_t)0; dumpbytes -= (off_t)nr) { 566 char nbuf[7]; 567 humanize_number(nbuf, 7, dumpbytes, "", HN_AUTOSCALE, 0); 568 (void)printf("%7s\r", nbuf); 569 (void)fflush(stdout); 570 nr = read(ifd, buf, MIN(dumpbytes, sizeof(buf))); 571 if (nr <= 0) { 572 if (nr == 0) 573 syslog(LOG_WARNING, 574 "WARNING: EOF on dump device"); 575 else 576 syslog(LOG_ERR, "%s: %m", rawp); 577 goto err2; 578 } 579 nw = fwrite(buf, 1, nr, fp); 580 if (nw != nr) { 581 syslog(LOG_ERR, "%s: %s", 582 path, strerror(nw == 0 ? EIO : errno)); 583 err2: syslog(LOG_WARNING, 584 "WARNING: core may be incomplete"); 585 (void)printf("\n"); 586 exit(1); 587 } 588 } 589 (void)close(ifd); 590 (void)fclose(fp); 591 592 /* Copy the kernel. */ 593 ifd = Open(kernel, O_RDONLY); 594 (void)snprintf(path, sizeof(path), "%s/netbsd.%d%s", 595 dirname, bounds, compress ? ".gz" : ""); 596 if (compress) { 597 if ((fp = zopen(path, gzmode)) == NULL) { 598 syslog(LOG_ERR, "%s: %m", path); 599 exit(1); 600 } 601 } else 602 ofd = Create(path, S_IRUSR | S_IWUSR); 603 syslog(LOG_NOTICE, "writing %skernel to %s", 604 compress ? "compressed " : "", path); 605 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 606 if (compress) 607 nw = fwrite(buf, 1, nr, fp); 608 else 609 nw = write(ofd, buf, nr); 610 if (nw != nr) { 611 syslog(LOG_ERR, "%s: %s", 612 path, strerror(nw == 0 ? EIO : errno)); 613 syslog(LOG_WARNING, 614 "WARNING: kernel may be incomplete"); 615 exit(1); 616 } 617 } 618 if (nr < 0) { 619 syslog(LOG_ERR, "%s: %m", kernel); 620 syslog(LOG_WARNING, "WARNING: kernel may be incomplete"); 621 exit(1); 622 } 623 if (compress) 624 (void)fclose(fp); 625 else 626 (void)close(ofd); 627 } 628 629 char * 630 find_dev(dev_t dev, int type) 631 { 632 DIR *dfd; 633 struct dirent *dir; 634 struct stat sb; 635 char *dp, device[MAXPATHLEN + 1], *p; 636 size_t l; 637 638 if ((dfd = opendir(_PATH_DEV)) == NULL) { 639 syslog(LOG_ERR, "%s: %m", _PATH_DEV); 640 exit(1); 641 } 642 strlcpy(device, _PATH_DEV, sizeof(device)); 643 p = &device[strlen(device)]; 644 l = sizeof(device) - strlen(device); 645 while ((dir = readdir(dfd))) { 646 strlcpy(p, dir->d_name, l); 647 if (lstat(device, &sb)) { 648 syslog(LOG_ERR, "%s: %m", device); 649 continue; 650 } 651 if ((sb.st_mode & S_IFMT) != type) 652 continue; 653 if (dev == sb.st_rdev) { 654 closedir(dfd); 655 if ((dp = strdup(device)) == NULL) { 656 syslog(LOG_ERR, "%m"); 657 exit(1); 658 } 659 return (dp); 660 } 661 } 662 closedir(dfd); 663 syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 664 exit(1); 665 } 666 667 char * 668 rawname(char *s) 669 { 670 char *sl; 671 char name[MAXPATHLEN]; 672 673 if ((sl = strrchr(s, '/')) == NULL || sl[1] == '0') { 674 syslog(LOG_ERR, 675 "can't make raw dump device name from %s", s); 676 return (s); 677 } 678 (void)snprintf(name, sizeof(name), "%.*s/r%s", (int)(sl - s), s, 679 sl + 1); 680 if ((sl = strdup(name)) == NULL) { 681 syslog(LOG_ERR, "%m"); 682 exit(1); 683 } 684 return (sl); 685 } 686 687 int 688 get_crashtime(void) 689 { 690 time_t dumptime; /* Time the dump was taken. */ 691 #ifndef __HAVE_TIMECOUNTER 692 struct timeval dtime; 693 #endif 694 695 #ifdef __HAVE_TIMECOUNTER 696 if (KREAD(kd_dump, dump_nl[X_TIME_SECOND].n_value, &dumptime) != 0) { 697 if (verbose) 698 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 699 return (0); 700 } 701 #else 702 if (KREAD(kd_dump, dump_nl[X_TIME_SECOND].n_value, &dtime) != 0) { 703 if (verbose) 704 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 705 return (0); 706 } 707 dumptime = dtime.tv_sec; 708 #endif 709 if (dumptime == 0) { 710 if (verbose) 711 syslog(LOG_ERR, "dump time is zero"); 712 return (0); 713 } 714 (void)printf("savecore: system went down at %s", ctime(&dumptime)); 715 #define LEEWAY (60 * SECSPERDAY) 716 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 717 (void)printf("dump time is unreasonable\n"); 718 return (0); 719 } 720 return (1); 721 } 722 723 int 724 check_space(void) 725 { 726 FILE *fp; 727 off_t minfree, spacefree, kernelsize, needed; 728 struct stat st; 729 struct statvfs fsbuf; 730 char mbuf[100], path[MAXPATHLEN]; 731 732 #ifdef __GNUC__ 733 (void) &minfree; 734 #endif 735 736 if (stat(kernel, &st) < 0) { 737 syslog(LOG_ERR, "%s: %m", kernel); 738 exit(1); 739 } 740 kernelsize = st.st_blocks * S_BLKSIZE; 741 if (statvfs(dirname, &fsbuf) < 0) { 742 syslog(LOG_ERR, "%s: %m", dirname); 743 exit(1); 744 } 745 spacefree = fsbuf.f_bavail; 746 spacefree *= fsbuf.f_frsize; 747 spacefree /= 1024; 748 749 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 750 if ((fp = fopen(path, "r")) == NULL) 751 minfree = 0; 752 else { 753 if (fgets(mbuf, sizeof(mbuf), fp) == NULL) 754 minfree = 0; 755 else 756 minfree = atoi(mbuf); 757 (void)fclose(fp); 758 } 759 760 needed = (dumpbytes + kernelsize) / 1024; 761 if (minfree > 0 && spacefree - needed < minfree) { 762 syslog(LOG_WARNING, 763 "no dump, not enough free space in %s", dirname); 764 return (0); 765 } 766 if (spacefree - needed < minfree) 767 syslog(LOG_WARNING, 768 "dump performed, but free space threshold crossed"); 769 return (1); 770 } 771 772 int 773 Open(const char *name, int rw) 774 { 775 int fd; 776 777 if ((fd = open(name, rw, 0)) < 0) { 778 syslog(LOG_ERR, "%s: %m", name); 779 exit(1); 780 } 781 return (fd); 782 } 783 784 void 785 Lseek(int fd, off_t off, int flag) 786 { 787 off_t ret; 788 789 ret = lseek(fd, off, flag); 790 if (ret == -1) { 791 syslog(LOG_ERR, "lseek: %m"); 792 exit(1); 793 } 794 } 795 796 int 797 Create(char *file, int mode) 798 { 799 int fd; 800 801 fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode); 802 if (fd < 0) { 803 syslog(LOG_ERR, "%s: %m", file); 804 exit(1); 805 } 806 return (fd); 807 } 808 809 void 810 Write(int fd, void *bp, int size) 811 { 812 int n; 813 814 if ((n = write(fd, bp, size)) < size) { 815 syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 816 exit(1); 817 } 818 } 819 820 void 821 usage(void) 822 { 823 (void)syslog(LOG_ERR, 824 "usage: savecore [-cfnvz] [-N system] [-Z level] directory"); 825 exit(1); 826 } 827
Indexes created Thu Oct 02 10:09:58 GMT 2025