savecore.c revision 1.66
1 /* $NetBSD: savecore.c,v 1.66 2006/03/17 01:45:51 hubertf 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 1.66 2006/03/17 01:45:51 hubertf 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 2 79 { "_time" }, 80 #define X_DUMPSIZE 3 81 { "_dumpsize" }, 82 #define X_VERSION 4 83 { "_version" }, 84 #define X_DUMPMAG 5 85 { "_dumpmag" }, 86 #define X_PANICSTR 6 87 { "_panicstr" }, 88 #define X_PANICSTART 7 89 { "_panicstart" }, 90 #define X_PANICEND 8 91 { "_panicend" }, 92 #define X_MSGBUF 9 93 { "_msgbufp" }, 94 { NULL }, 95 }; 96 int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 }; 97 int dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 }; 98 99 struct nlist dump_nl[] = { /* Name list for dumped system. */ 100 { "_dumpdev" }, /* Entries MUST be the same as */ 101 { "_dumplo" }, /* those in current_nl[]. */ 102 { "_time" }, 103 { "_dumpsize" }, 104 { "_version" }, 105 { "_dumpmag" }, 106 { "_panicstr" }, 107 { "_panicstart" }, 108 { "_panicend" }, 109 { "_msgbufp" }, 110 { NULL }, 111 }; 112 113 /* Types match kernel declarations. */ 114 off_t dumplo; /* where dump starts on dumpdev */ 115 u_int32_t dumpmag; /* magic number in dump */ 116 int dumpsize; /* amount of memory dumped */ 117 off_t dumpbytes; /* in bytes */ 118 119 const char *kernel; /* name of used kernel */ 120 char *dirname; /* directory to save dumps in */ 121 char *ddname; /* name of dump device */ 122 dev_t dumpdev; /* dump device */ 123 int dumpfd; /* read/write descriptor on block dev */ 124 kvm_t *kd_dump; /* kvm descriptor on block dev */ 125 time_t now; /* current date */ 126 char panic_mesg[1024]; 127 long panicstr; 128 char vers[1024]; 129 char gzmode[3]; 130 131 static int clear, compress, force, verbose; /* flags */ 132 133 void check_kmem(void); 134 int check_space(void); 135 void clear_dump(void); 136 int Create(char *, int); 137 int dump_exists(void); 138 char *find_dev(dev_t, int); 139 int get_crashtime(void); 140 void kmem_setup(void); 141 void Lseek(int, off_t, int); 142 int main(int, char *[]); 143 int Open(const char *, int rw); 144 char *rawname(char *s); 145 void save_core(void); 146 void usage(void); 147 void Write(int, void *, int); 148 149 int 150 main(int argc, char *argv[]) 151 { 152 int ch, level, testonly; 153 char *ep; 154 155 dirname = NULL; 156 kernel = NULL; 157 level = 1; /* default to fastest gzip compression */ 158 testonly = 0; 159 gzmode[0] = 'w'; 160 161 openlog("savecore", LOG_PERROR, LOG_DAEMON); 162 163 while ((ch = getopt(argc, argv, "cdfnN:vzZ:")) != -1) 164 switch(ch) { 165 case 'c': 166 clear = 1; 167 break; 168 case 'd': /* Not documented. */ 169 case 'v': 170 verbose = 1; 171 break; 172 case 'f': 173 force = 1; 174 break; 175 case 'n': 176 testonly = 1; 177 break; 178 case 'N': 179 kernel = optarg; 180 break; 181 case 'z': 182 compress = 1; 183 break; 184 case 'Z': 185 level = (int)strtol(optarg, &ep, 10); 186 if (level < 0 || level > 9) { 187 (void)syslog(LOG_ERR, "invalid compression %s", 188 optarg); 189 usage(); 190 } 191 break; 192 case '?': 193 default: 194 usage(); 195 } 196 argc -= optind; 197 argv += optind; 198 199 if (argc != ((clear || testonly) ? 0 : 1)) 200 usage(); 201 202 gzmode[1] = level + '0'; 203 if (!clear) 204 dirname = argv[0]; 205 206 if (kernel == NULL) { 207 kernel = getbootfile(); 208 } 209 210 (void)time(&now); 211 kmem_setup(); 212 213 if (clear && !testonly) { 214 clear_dump(); 215 exit(0); 216 } 217 218 if (!dump_exists() && !force) 219 exit(1); 220 221 if (testonly) 222 /* If -n was passed and there was a dump, exit at level 0 */ 223 exit(0); 224 225 check_kmem(); 226 227 if (panicstr) 228 syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); 229 else 230 syslog(LOG_ALERT, "reboot"); 231 232 if ((!get_crashtime() || !check_space()) && !force) 233 exit(1); 234 235 save_core(); 236 237 clear_dump(); 238 exit(0); 239 } 240 241 void 242 kmem_setup(void) 243 { 244 kvm_t *kd_kern; 245 char errbuf[_POSIX2_LINE_MAX]; 246 int i, hdrsz; 247 248 /* 249 * Some names we need for the currently running system, others for 250 * the system that was running when the dump was made. The values 251 * obtained from the current system are used to look for things in 252 * /dev/kmem that cannot be found in the kernel namelist, but are 253 * presumed to be the same (since the disk partitions are probably 254 * the same!) 255 */ 256 kd_kern = kvm_openfiles(kernel, NULL, NULL, O_RDONLY, errbuf); 257 if (kd_kern == NULL) { 258 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 259 exit(1); 260 } 261 if (kvm_nlist(kd_kern, current_nl) == -1) 262 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 263 kvm_geterr(kd_kern)); 264 265 for (i = 0; cursyms[i] != -1; i++) 266 if (current_nl[cursyms[i]].n_value == 0) { 267 syslog(LOG_ERR, "%s: %s not in namelist", 268 kernel, current_nl[cursyms[i]].n_name); 269 exit(1); 270 } 271 272 if (KREAD(kd_kern, current_nl[X_DUMPDEV].n_value, &dumpdev) != 0) { 273 if (verbose) 274 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 275 exit(1); 276 } 277 if (dumpdev == NODEV) { 278 syslog(LOG_WARNING, "no core dump (no dumpdev)"); 279 exit(1); 280 } 281 { 282 long l_dumplo; 283 284 if (KREAD(kd_kern, current_nl[X_DUMPLO].n_value, &l_dumplo) != 0) { 285 if (verbose) 286 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 287 exit(1); 288 } 289 if (l_dumplo == -1) { 290 syslog(LOG_WARNING, "no core dump (invalid dumplo)"); 291 exit(1); 292 } 293 dumplo = DEV_BSIZE * (off_t) l_dumplo; 294 } 295 296 if (verbose) 297 (void)printf("dumplo = %lld (%ld * %ld)\n", 298 (long long)dumplo, (long)(dumplo / DEV_BSIZE), (long)DEV_BSIZE); 299 if (KREAD(kd_kern, current_nl[X_DUMPMAG].n_value, &dumpmag) != 0) { 300 if (verbose) 301 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 302 exit(1); 303 } 304 305 (void)kvm_read(kd_kern, current_nl[X_VERSION].n_value, vers, 306 sizeof(vers)); 307 vers[sizeof(vers) - 1] = '\0'; 308 309 ddname = find_dev(dumpdev, S_IFBLK); 310 dumpfd = Open(ddname, O_RDWR); 311 312 kd_dump = kvm_openfiles(kernel, ddname, NULL, O_RDWR, errbuf); 313 if (kd_dump == NULL) { 314 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 315 exit(1); 316 } 317 318 if (kvm_nlist(kd_dump, dump_nl) == -1) 319 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 320 kvm_geterr(kd_dump)); 321 322 for (i = 0; dumpsyms[i] != -1; i++) 323 if (dump_nl[dumpsyms[i]].n_value == 0) { 324 syslog(LOG_ERR, "%s: %s not in namelist", 325 kernel, dump_nl[dumpsyms[i]].n_name); 326 exit(1); 327 } 328 hdrsz = kvm_dump_mkheader(kd_dump, dumplo); 329 330 /* 331 * If 'hdrsz' == 0, kvm_dump_mkheader() failed on the magic-number 332 * checks, ergo no dump is present... 333 */ 334 if (hdrsz == 0) { 335 syslog(LOG_WARNING, "no core dump"); 336 exit(1); 337 } 338 if (hdrsz == -1) { 339 syslog(LOG_ERR, "%s: kvm_dump_mkheader: %s", kernel, 340 kvm_geterr(kd_dump)); 341 exit(1); 342 } 343 dumplo += hdrsz; 344 kvm_close(kd_kern); 345 } 346 347 void 348 check_kmem(void) 349 { 350 char *cp, *bufdata; 351 struct kern_msgbuf msgbuf, *bufp; 352 long panicloc, panicstart, panicend; 353 char core_vers[1024]; 354 355 (void)kvm_read(kd_dump, dump_nl[X_VERSION].n_value, core_vers, 356 sizeof(core_vers)); 357 core_vers[sizeof(core_vers) - 1] = '\0'; 358 359 if (strcmp(vers, core_vers) != 0) 360 syslog(LOG_WARNING, 361 "warning: %s version mismatch:\n\t%s\nand\t%s\n", 362 kernel, vers, core_vers); 363 364 panicstart = panicend = 0; 365 if (KREAD(kd_dump, dump_nl[X_PANICSTART].n_value, &panicstart) != 0) { 366 if (verbose) 367 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 368 goto nomsguf; 369 } 370 if (KREAD(kd_dump, dump_nl[X_PANICEND].n_value, &panicend) != 0) { 371 if (verbose) 372 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 373 goto nomsguf; 374 } 375 if (panicstart != 0 && panicend != 0) { 376 if (KREAD(kd_dump, dump_nl[X_MSGBUF].n_value, &bufp)) { 377 if (verbose) 378 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 379 goto nomsguf; 380 } 381 if (kvm_read(kd_dump, (long)bufp, &msgbuf, 382 offsetof(struct kern_msgbuf, msg_bufc)) != 383 offsetof(struct kern_msgbuf, msg_bufc)) { 384 if (verbose) 385 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 386 goto nomsguf; 387 } 388 if (msgbuf.msg_magic != MSG_MAGIC) { 389 if (verbose) 390 syslog(LOG_WARNING, "msgbuf magic incorrect"); 391 goto nomsguf; 392 } 393 bufdata = malloc(msgbuf.msg_bufs); 394 if (bufdata == NULL) { 395 if (verbose) 396 syslog(LOG_WARNING, "couldn't allocate space for msgbuf data"); 397 goto nomsguf; 398 } 399 if (kvm_read(kd_dump, (long)&bufp->msg_bufc, bufdata, 400 msgbuf.msg_bufs) != msgbuf.msg_bufs) { 401 if (verbose) 402 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 403 free(bufdata); 404 goto nomsguf; 405 } 406 cp = panic_mesg; 407 while (panicstart != panicend && cp < &panic_mesg[sizeof(panic_mesg)-1]) { 408 *cp++ = bufdata[panicstart]; 409 panicstart++; 410 if (panicstart >= msgbuf.msg_bufs) 411 panicstart = 0; 412 } 413 /* Don't end in a new-line */ 414 cp = &panic_mesg[strlen(panic_mesg)] - 1; 415 if (*cp == '\n') 416 *cp = '\0'; 417 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 418 free(bufdata); 419 420 panicstr = 1; /* anything not zero */ 421 return; 422 } 423 nomsguf: 424 if (KREAD(kd_dump, dump_nl[X_PANICSTR].n_value, &panicstr) != 0) { 425 if (verbose) 426 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 427 return; 428 } 429 if (panicstr) { 430 cp = panic_mesg; 431 panicloc = panicstr; 432 do { 433 if (KREAD(kd_dump, panicloc, cp) != 0) { 434 if (verbose) 435 syslog(LOG_WARNING, "kvm_read: %s", 436 kvm_geterr(kd_dump)); 437 break; 438 } 439 panicloc++; 440 } while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)-1]); 441 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 442 } 443 } 444 445 int 446 dump_exists(void) 447 { 448 u_int32_t newdumpmag; 449 450 if (KREAD(kd_dump, dump_nl[X_DUMPMAG].n_value, &newdumpmag) != 0) { 451 if (verbose) 452 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 453 return (0); 454 } 455 456 /* Read the dump size. */ 457 if (KREAD(kd_dump, dump_nl[X_DUMPSIZE].n_value, &dumpsize) != 0) { 458 if (verbose) 459 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 460 return (0); 461 } 462 dumpbytes = (off_t)dumpsize * getpagesize(); 463 464 /* 465 * Return zero if core dump doesn't seem to be there, and note 466 * it for syslog. This check and return happens after the dump size 467 * is read, so dumpsize is whether or not the core is valid (for -f). 468 */ 469 if (newdumpmag != dumpmag) { 470 if (verbose) 471 syslog(LOG_WARNING, 472 "magic number mismatch (0x%x != 0x%x)", 473 newdumpmag, dumpmag); 474 syslog(LOG_WARNING, "no core dump"); 475 return (0); 476 } 477 return (1); 478 } 479 480 void 481 clear_dump(void) 482 { 483 if (kvm_dump_inval(kd_dump) == -1) 484 syslog(LOG_ERR, "%s: kvm_clear_dump: %s", ddname, 485 kvm_geterr(kd_dump)); 486 487 } 488 489 char buf[1024 * 1024]; 490 491 void 492 save_core(void) 493 { 494 FILE *fp; 495 int bounds, ifd, nr, nw, ofd; 496 char *rawp, path[MAXPATHLEN]; 497 498 ofd = -1; 499 /* 500 * Get the current number and update the bounds file. Do the update 501 * now, because may fail later and don't want to overwrite anything. 502 */ 503 umask(066); 504 (void)snprintf(path, sizeof(path), "%s/bounds", dirname); 505 if ((fp = fopen(path, "r")) == NULL) 506 goto err1; 507 if (fgets(buf, sizeof(buf), fp) == NULL) { 508 if (ferror(fp)) 509 err1: syslog(LOG_WARNING, "%s: %m", path); 510 bounds = 0; 511 } else 512 bounds = atoi(buf); 513 if (fp != NULL) 514 (void)fclose(fp); 515 if ((fp = fopen(path, "w")) == NULL) 516 syslog(LOG_ERR, "%s: %m", path); 517 else { 518 (void)fprintf(fp, "%d\n", bounds + 1); 519 (void)fclose(fp); 520 } 521 522 /* Create the core file. */ 523 (void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s", 524 dirname, bounds, compress ? ".gz" : ""); 525 if (compress) { 526 if ((fp = zopen(path, gzmode)) == NULL) { 527 syslog(LOG_ERR, "%s: %m", path); 528 exit(1); 529 } 530 } else { 531 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 532 fp = fdopen(ofd, "w"); 533 if (fp == NULL) { 534 syslog(LOG_ERR, "%s: fdopen: %m", path); 535 exit(1); 536 } 537 } 538 539 /* Open the raw device. */ 540 rawp = rawname(ddname); 541 if ((ifd = open(rawp, O_RDONLY)) == -1) { 542 syslog(LOG_WARNING, "%s: %m; using block device", rawp); 543 ifd = dumpfd; 544 } 545 546 /* Seek to the start of the core. */ 547 Lseek(ifd, dumplo, SEEK_SET); 548 549 if (kvm_dump_wrtheader(kd_dump, fp, (int32_t)dumpbytes) == -1) { 550 syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path, 551 kvm_geterr(kd_dump)); 552 exit(1); 553 } 554 555 /* Copy the core file. */ 556 syslog(LOG_NOTICE, "writing %score to %s", 557 compress ? "compressed " : "", path); 558 for (; dumpbytes > (off_t)0; dumpbytes -= (off_t)nr) { 559 char nbuf[7]; 560 humanize_number(nbuf, 7, dumpbytes, "", HN_AUTOSCALE, 0); 561 (void)printf("%7s\r", nbuf); 562 (void)fflush(stdout); 563 nr = read(ifd, buf, MIN(dumpbytes, sizeof(buf))); 564 if (nr <= 0) { 565 if (nr == 0) 566 syslog(LOG_WARNING, 567 "WARNING: EOF on dump device"); 568 else 569 syslog(LOG_ERR, "%s: %m", rawp); 570 goto err2; 571 } 572 nw = fwrite(buf, 1, nr, fp); 573 if (nw != nr) { 574 syslog(LOG_ERR, "%s: %s", 575 path, strerror(nw == 0 ? EIO : errno)); 576 err2: syslog(LOG_WARNING, 577 "WARNING: core may be incomplete"); 578 (void)printf("\n"); 579 exit(1); 580 } 581 } 582 (void)close(ifd); 583 (void)fclose(fp); 584 585 /* Copy the kernel. */ 586 ifd = Open(kernel, O_RDONLY); 587 (void)snprintf(path, sizeof(path), "%s/netbsd.%d%s", 588 dirname, bounds, compress ? ".gz" : ""); 589 if (compress) { 590 if ((fp = zopen(path, gzmode)) == NULL) { 591 syslog(LOG_ERR, "%s: %m", path); 592 exit(1); 593 } 594 } else 595 ofd = Create(path, S_IRUSR | S_IWUSR); 596 syslog(LOG_NOTICE, "writing %skernel to %s", 597 compress ? "compressed " : "", path); 598 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 599 if (compress) 600 nw = fwrite(buf, 1, nr, fp); 601 else 602 nw = write(ofd, buf, nr); 603 if (nw != nr) { 604 syslog(LOG_ERR, "%s: %s", 605 path, strerror(nw == 0 ? EIO : errno)); 606 syslog(LOG_WARNING, 607 "WARNING: kernel may be incomplete"); 608 exit(1); 609 } 610 } 611 if (nr < 0) { 612 syslog(LOG_ERR, "%s: %m", kernel); 613 syslog(LOG_WARNING, "WARNING: kernel may be incomplete"); 614 exit(1); 615 } 616 if (compress) 617 (void)fclose(fp); 618 else 619 (void)close(ofd); 620 } 621 622 char * 623 find_dev(dev_t dev, int type) 624 { 625 DIR *dfd; 626 struct dirent *dir; 627 struct stat sb; 628 char *dp, device[MAXPATHLEN + 1], *p; 629 size_t l; 630 631 if ((dfd = opendir(_PATH_DEV)) == NULL) { 632 syslog(LOG_ERR, "%s: %m", _PATH_DEV); 633 exit(1); 634 } 635 strlcpy(device, _PATH_DEV, sizeof(device)); 636 p = &device[strlen(device)]; 637 l = sizeof(device) - strlen(device); 638 while ((dir = readdir(dfd))) { 639 strlcpy(p, dir->d_name, l); 640 if (lstat(device, &sb)) { 641 syslog(LOG_ERR, "%s: %m", device); 642 continue; 643 } 644 if ((sb.st_mode & S_IFMT) != type) 645 continue; 646 if (dev == sb.st_rdev) { 647 closedir(dfd); 648 if ((dp = strdup(device)) == NULL) { 649 syslog(LOG_ERR, "%m"); 650 exit(1); 651 } 652 return (dp); 653 } 654 } 655 closedir(dfd); 656 syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 657 exit(1); 658 } 659 660 char * 661 rawname(char *s) 662 { 663 char *sl; 664 char name[MAXPATHLEN]; 665 666 if ((sl = strrchr(s, '/')) == NULL || sl[1] == '0') { 667 syslog(LOG_ERR, 668 "can't make raw dump device name from %s", s); 669 return (s); 670 } 671 (void)snprintf(name, sizeof(name), "%.*s/r%s", (int)(sl - s), s, 672 sl + 1); 673 if ((sl = strdup(name)) == NULL) { 674 syslog(LOG_ERR, "%m"); 675 exit(1); 676 } 677 return (sl); 678 } 679 680 int 681 get_crashtime(void) 682 { 683 struct timeval dtime; 684 time_t dumptime; /* Time the dump was taken. */ 685 686 if (KREAD(kd_dump, dump_nl[X_TIME].n_value, &dtime) != 0) { 687 if (verbose) 688 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 689 return (0); 690 } 691 dumptime = dtime.tv_sec; 692 if (dumptime == 0) { 693 if (verbose) 694 syslog(LOG_ERR, "dump time is zero"); 695 return (0); 696 } 697 (void)printf("savecore: system went down at %s", ctime(&dumptime)); 698 #define LEEWAY (60 * SECSPERDAY) 699 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 700 (void)printf("dump time is unreasonable\n"); 701 return (0); 702 } 703 return (1); 704 } 705 706 int 707 check_space(void) 708 { 709 FILE *fp; 710 off_t minfree, spacefree, kernelsize, needed; 711 struct stat st; 712 struct statvfs fsbuf; 713 char mbuf[100], path[MAXPATHLEN]; 714 715 #ifdef __GNUC__ 716 (void) &minfree; 717 #endif 718 719 if (stat(kernel, &st) < 0) { 720 syslog(LOG_ERR, "%s: %m", kernel); 721 exit(1); 722 } 723 kernelsize = st.st_blocks * S_BLKSIZE; 724 if (statvfs(dirname, &fsbuf) < 0) { 725 syslog(LOG_ERR, "%s: %m", dirname); 726 exit(1); 727 } 728 spacefree = fsbuf.f_bavail; 729 spacefree *= fsbuf.f_frsize; 730 spacefree /= 1024; 731 732 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 733 if ((fp = fopen(path, "r")) == NULL) 734 minfree = 0; 735 else { 736 if (fgets(mbuf, sizeof(mbuf), fp) == NULL) 737 minfree = 0; 738 else 739 minfree = atoi(mbuf); 740 (void)fclose(fp); 741 } 742 743 needed = (dumpbytes + kernelsize) / 1024; 744 if (minfree > 0 && spacefree - needed < minfree) { 745 syslog(LOG_WARNING, 746 "no dump, not enough free space in %s", dirname); 747 return (0); 748 } 749 if (spacefree - needed < minfree) 750 syslog(LOG_WARNING, 751 "dump performed, but free space threshold crossed"); 752 return (1); 753 } 754 755 int 756 Open(const char *name, int rw) 757 { 758 int fd; 759 760 if ((fd = open(name, rw, 0)) < 0) { 761 syslog(LOG_ERR, "%s: %m", name); 762 exit(1); 763 } 764 return (fd); 765 } 766 767 void 768 Lseek(int fd, off_t off, int flag) 769 { 770 off_t ret; 771 772 ret = lseek(fd, off, flag); 773 if (ret == -1) { 774 syslog(LOG_ERR, "lseek: %m"); 775 exit(1); 776 } 777 } 778 779 int 780 Create(char *file, int mode) 781 { 782 int fd; 783 784 fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode); 785 if (fd < 0) { 786 syslog(LOG_ERR, "%s: %m", file); 787 exit(1); 788 } 789 return (fd); 790 } 791 792 void 793 Write(int fd, void *bp, int size) 794 { 795 int n; 796 797 if ((n = write(fd, bp, size)) < size) { 798 syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 799 exit(1); 800 } 801 } 802 803 void 804 usage(void) 805 { 806 (void)syslog(LOG_ERR, 807 "usage: savecore [-cfnvz] [-N system] [-Z level] directory"); 808 exit(1); 809 } 810
Indexes created Thu Oct 02 10:09:58 GMT 2025