savecore.c revision 1.75
1 /* $NetBSD: savecore.c,v 1.75 2008/10/09 13:59:50 joerg 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\ 35 The Regents of the University of California. All rights reserved."); 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 1.75 2008/10/09 13:59:50 joerg 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 { .n_name = "_dumpdev" }, 76 #define X_DUMPLO 1 77 { .n_name = "_dumplo" }, 78 #define X_TIME_SECOND 2 79 { .n_name = "_time_second" }, 80 #define X_TIME 3 81 { .n_name = "_time" }, 82 #define X_DUMPSIZE 4 83 { .n_name = "_dumpsize" }, 84 #define X_VERSION 5 85 { .n_name = "_version" }, 86 #define X_DUMPMAG 6 87 { .n_name = "_dumpmag" }, 88 #define X_PANICSTR 7 89 { .n_name = "_panicstr" }, 90 #define X_PANICSTART 8 91 { .n_name = "_panicstart" }, 92 #define X_PANICEND 9 93 { .n_name = "_panicend" }, 94 #define X_MSGBUF 10 95 { .n_name = "_msgbufp" }, 96 #define X_DUMPCDEV 11 97 { .n_name = "_dumpcdev" }, 98 { .n_name = NULL }, 99 }; 100 int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, X_DUMPCDEV, -1 }; 101 int dumpsyms[] = { X_TIME_SECOND, X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, 102 X_DUMPMAG, -1 }; 103 104 struct nlist dump_nl[] = { /* Name list for dumped system. */ 105 { .n_name = "_dumpdev" }, /* Entries MUST be the same as */ 106 { .n_name = "_dumplo" }, /* those in current_nl[]. */ 107 { .n_name = "_time_second" }, 108 { .n_name = "_time" }, 109 { .n_name = "_dumpsize" }, 110 { .n_name = "_version" }, 111 { .n_name = "_dumpmag" }, 112 { .n_name = "_panicstr" }, 113 { .n_name = "_panicstart" }, 114 { .n_name = "_panicend" }, 115 { .n_name = "_msgbufp" }, 116 { .n_name = "_dumpcdev" }, 117 { .n_name = NULL }, 118 }; 119 120 /* Types match kernel declarations. */ 121 off_t dumplo; /* where dump starts on dumpdev */ 122 u_int32_t dumpmag; /* magic number in dump */ 123 int dumpsize; /* amount of memory dumped */ 124 off_t dumpbytes; /* in bytes */ 125 126 const char *kernel; /* name of used kernel */ 127 char *dirname; /* directory to save dumps in */ 128 char *ddname; /* name of dump device */ 129 dev_t dumpdev; /* dump device */ 130 dev_t dumpcdev = NODEV; /* dump device (char equivalent) */ 131 int dumpfd; /* read/write descriptor on dev */ 132 kvm_t *kd_dump; /* kvm descriptor on dev */ 133 time_t now; /* current date */ 134 char panic_mesg[1024]; 135 long panicstr; 136 char vers[1024]; 137 char gzmode[3]; 138 139 static int clear, compress, force, verbose; /* flags */ 140 141 void check_kmem(void); 142 int check_space(void); 143 void clear_dump(void); 144 int Create(char *, int); 145 int dump_exists(void); 146 char *find_dev(dev_t, int); 147 int get_crashtime(void); 148 void kmem_setup(void); 149 void Lseek(int, off_t, int); 150 int main(int, char *[]); 151 int Open(const char *, int rw); 152 char *rawname(char *s); 153 void save_core(void); 154 void usage(void); 155 void Write(int, void *, int); 156 157 int 158 main(int argc, char *argv[]) 159 { 160 int ch, level, testonly; 161 char *ep; 162 163 dirname = NULL; 164 kernel = NULL; 165 level = 1; /* default to fastest gzip compression */ 166 testonly = 0; 167 gzmode[0] = 'w'; 168 169 openlog("savecore", LOG_PERROR, LOG_DAEMON); 170 171 while ((ch = getopt(argc, argv, "cdfnN:vzZ:")) != -1) 172 switch(ch) { 173 case 'c': 174 clear = 1; 175 break; 176 case 'd': /* Not documented. */ 177 case 'v': 178 verbose = 1; 179 break; 180 case 'f': 181 force = 1; 182 break; 183 case 'n': 184 testonly = 1; 185 break; 186 case 'N': 187 kernel = optarg; 188 break; 189 case 'z': 190 compress = 1; 191 break; 192 case 'Z': 193 level = (int)strtol(optarg, &ep, 10); 194 if (level < 0 || level > 9) { 195 (void)syslog(LOG_ERR, "invalid compression %s", 196 optarg); 197 usage(); 198 } 199 break; 200 case '?': 201 default: 202 usage(); 203 } 204 argc -= optind; 205 argv += optind; 206 207 if (argc != ((clear || testonly) ? 0 : 1)) 208 usage(); 209 210 gzmode[1] = level + '0'; 211 if (!clear) 212 dirname = argv[0]; 213 214 if (kernel == NULL) { 215 kernel = getbootfile(); 216 } 217 218 (void)time(&now); 219 kmem_setup(); 220 221 if (clear && !testonly) { 222 clear_dump(); 223 exit(0); 224 } 225 226 if (!dump_exists() && !force) 227 exit(1); 228 229 if (testonly) 230 /* If -n was passed and there was a dump, exit at level 0 */ 231 exit(0); 232 233 check_kmem(); 234 235 if (panicstr) 236 syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); 237 else 238 syslog(LOG_ALERT, "reboot"); 239 240 if ((!get_crashtime() || !check_space()) && !force) 241 exit(1); 242 243 save_core(); 244 245 clear_dump(); 246 exit(0); 247 } 248 249 void 250 kmem_setup(void) 251 { 252 kvm_t *kd_kern; 253 char errbuf[_POSIX2_LINE_MAX]; 254 int i, hdrsz; 255 256 /* 257 * Some names we need for the currently running system, others for 258 * the system that was running when the dump was made. The values 259 * obtained from the current system are used to look for things in 260 * /dev/kmem that cannot be found in the kernel namelist, but are 261 * presumed to be the same (since the disk partitions are probably 262 * the same!) 263 */ 264 kd_kern = kvm_openfiles(kernel, NULL, NULL, O_RDONLY, errbuf); 265 if (kd_kern == NULL) { 266 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 267 exit(1); 268 } 269 if (kvm_nlist(kd_kern, current_nl) == -1) 270 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 271 kvm_geterr(kd_kern)); 272 273 for (i = 0; cursyms[i] != -1; i++) { 274 if (current_nl[cursyms[i]].n_value != 0) 275 continue; 276 switch (cursyms[i]) { 277 case X_TIME_SECOND: 278 case X_TIME: 279 case X_DUMPCDEV: 280 break; 281 default: 282 syslog(LOG_ERR, "%s: %s not in namelist", 283 kernel, current_nl[cursyms[i]].n_name); 284 exit(1); 285 } 286 } 287 288 if (KREAD(kd_kern, current_nl[X_DUMPDEV].n_value, &dumpdev) != 0) { 289 if (verbose) 290 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 291 exit(1); 292 } 293 if (dumpdev == NODEV) { 294 syslog(LOG_WARNING, "no core dump (no dumpdev)"); 295 exit(1); 296 } 297 { 298 long l_dumplo; 299 300 if (KREAD(kd_kern, current_nl[X_DUMPLO].n_value, &l_dumplo) != 0) { 301 if (verbose) 302 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 303 exit(1); 304 } 305 if (l_dumplo == -1) { 306 syslog(LOG_WARNING, "no core dump (invalid dumplo)"); 307 exit(1); 308 } 309 dumplo = DEV_BSIZE * (off_t) l_dumplo; 310 } 311 312 if (verbose) 313 (void)printf("dumplo = %lld (%ld * %ld)\n", 314 (long long)dumplo, (long)(dumplo / DEV_BSIZE), (long)DEV_BSIZE); 315 if (KREAD(kd_kern, current_nl[X_DUMPMAG].n_value, &dumpmag) != 0) { 316 if (verbose) 317 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 318 exit(1); 319 } 320 321 (void)kvm_read(kd_kern, current_nl[X_VERSION].n_value, vers, 322 sizeof(vers)); 323 vers[sizeof(vers) - 1] = '\0'; 324 325 if (current_nl[X_DUMPCDEV].n_value != 0) { 326 if (KREAD(kd_kern, current_nl[X_DUMPCDEV].n_value, 327 &dumpcdev) != 0) { 328 if (verbose) 329 syslog(LOG_WARNING, "kvm_read: %s", 330 kvm_geterr(kd_kern)); 331 exit(1); 332 } 333 ddname = find_dev(dumpcdev, S_IFCHR); 334 } else 335 ddname = find_dev(dumpdev, S_IFBLK); 336 if (strncmp(ddname, "/dev/cons", 8) == 0 || 337 strncmp(ddname, "/dev/tty", 7) == 0 || 338 strncmp(ddname, "/dev/pty", 7) == 0 || 339 strncmp(ddname, "/dev/pts", 7) == 0) { 340 syslog(LOG_ERR, "dumpdev %s is tty; override kernel", ddname); 341 exit(1); 342 } 343 dumpfd = Open(ddname, O_RDWR); 344 345 kd_dump = kvm_openfiles(kernel, ddname, NULL, O_RDWR, errbuf); 346 if (kd_dump == NULL) { 347 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 348 exit(1); 349 } 350 351 if (kvm_nlist(kd_dump, dump_nl) == -1) 352 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 353 kvm_geterr(kd_dump)); 354 355 for (i = 0; dumpsyms[i] != -1; i++) 356 if (dump_nl[dumpsyms[i]].n_value == 0 && 357 dumpsyms[i] != X_TIME_SECOND && 358 dumpsyms[i] != X_TIME) { 359 syslog(LOG_ERR, "%s: %s not in namelist", 360 kernel, dump_nl[dumpsyms[i]].n_name); 361 exit(1); 362 } 363 hdrsz = kvm_dump_mkheader(kd_dump, dumplo); 364 365 /* 366 * If 'hdrsz' == 0, kvm_dump_mkheader() failed on the magic-number 367 * checks, ergo no dump is present... 368 */ 369 if (hdrsz == 0) { 370 syslog(LOG_WARNING, "no core dump"); 371 exit(1); 372 } 373 if (hdrsz == -1) { 374 syslog(LOG_ERR, "%s: kvm_dump_mkheader: %s", kernel, 375 kvm_geterr(kd_dump)); 376 exit(1); 377 } 378 dumplo += hdrsz; 379 kvm_close(kd_kern); 380 } 381 382 void 383 check_kmem(void) 384 { 385 char *cp, *bufdata; 386 struct kern_msgbuf msgbuf, *bufp; 387 long panicloc, panicstart, panicend; 388 char core_vers[1024]; 389 390 (void)kvm_read(kd_dump, dump_nl[X_VERSION].n_value, core_vers, 391 sizeof(core_vers)); 392 core_vers[sizeof(core_vers) - 1] = '\0'; 393 394 if (strcmp(vers, core_vers) != 0) 395 syslog(LOG_WARNING, 396 "warning: %s version mismatch:\n\t%s\nand\t%s\n", 397 kernel, vers, core_vers); 398 399 panicstart = panicend = 0; 400 if (KREAD(kd_dump, dump_nl[X_PANICSTART].n_value, &panicstart) != 0) { 401 if (verbose) 402 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 403 goto nomsguf; 404 } 405 if (KREAD(kd_dump, dump_nl[X_PANICEND].n_value, &panicend) != 0) { 406 if (verbose) 407 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 408 goto nomsguf; 409 } 410 if (panicstart != 0 && panicend != 0) { 411 if (KREAD(kd_dump, dump_nl[X_MSGBUF].n_value, &bufp)) { 412 if (verbose) 413 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 414 goto nomsguf; 415 } 416 if (kvm_read(kd_dump, (long)bufp, &msgbuf, 417 offsetof(struct kern_msgbuf, msg_bufc)) != 418 offsetof(struct kern_msgbuf, msg_bufc)) { 419 if (verbose) 420 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 421 goto nomsguf; 422 } 423 if (msgbuf.msg_magic != MSG_MAGIC) { 424 if (verbose) 425 syslog(LOG_WARNING, "msgbuf magic incorrect"); 426 goto nomsguf; 427 } 428 bufdata = malloc(msgbuf.msg_bufs); 429 if (bufdata == NULL) { 430 if (verbose) 431 syslog(LOG_WARNING, "couldn't allocate space for msgbuf data"); 432 goto nomsguf; 433 } 434 if (kvm_read(kd_dump, (long)&bufp->msg_bufc, bufdata, 435 msgbuf.msg_bufs) != msgbuf.msg_bufs) { 436 if (verbose) 437 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 438 free(bufdata); 439 goto nomsguf; 440 } 441 cp = panic_mesg; 442 while (panicstart != panicend && cp < &panic_mesg[sizeof(panic_mesg)-1]) { 443 *cp++ = bufdata[panicstart]; 444 panicstart++; 445 if (panicstart >= msgbuf.msg_bufs) 446 panicstart = 0; 447 } 448 /* Don't end in a new-line */ 449 cp = &panic_mesg[strlen(panic_mesg)] - 1; 450 if (*cp == '\n') 451 *cp = '\0'; 452 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 453 free(bufdata); 454 455 panicstr = 1; /* anything not zero */ 456 return; 457 } 458 nomsguf: 459 if (KREAD(kd_dump, dump_nl[X_PANICSTR].n_value, &panicstr) != 0) { 460 if (verbose) 461 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 462 return; 463 } 464 if (panicstr) { 465 cp = panic_mesg; 466 panicloc = panicstr; 467 do { 468 if (KREAD(kd_dump, panicloc, cp) != 0) { 469 if (verbose) 470 syslog(LOG_WARNING, "kvm_read: %s", 471 kvm_geterr(kd_dump)); 472 break; 473 } 474 panicloc++; 475 } while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)-1]); 476 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 477 } 478 } 479 480 int 481 dump_exists(void) 482 { 483 u_int32_t newdumpmag; 484 485 if (KREAD(kd_dump, dump_nl[X_DUMPMAG].n_value, &newdumpmag) != 0) { 486 if (verbose) 487 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 488 return (0); 489 } 490 491 /* Read the dump size. */ 492 if (KREAD(kd_dump, dump_nl[X_DUMPSIZE].n_value, &dumpsize) != 0) { 493 if (verbose) 494 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 495 return (0); 496 } 497 dumpbytes = (off_t)dumpsize * getpagesize(); 498 499 /* 500 * Return zero if core dump doesn't seem to be there, and note 501 * it for syslog. This check and return happens after the dump size 502 * is read, so dumpsize is whether or not the core is valid (for -f). 503 */ 504 if (newdumpmag != dumpmag) { 505 if (verbose) 506 syslog(LOG_WARNING, 507 "magic number mismatch (0x%x != 0x%x)", 508 newdumpmag, dumpmag); 509 syslog(LOG_WARNING, "no core dump"); 510 return (0); 511 } 512 return (1); 513 } 514 515 void 516 clear_dump(void) 517 { 518 if (kvm_dump_inval(kd_dump) == -1) 519 syslog(LOG_ERR, "%s: kvm_dump_inval: %s", ddname, 520 kvm_geterr(kd_dump)); 521 522 } 523 524 char buf[1024 * 1024]; 525 526 void 527 save_core(void) 528 { 529 FILE *fp; 530 int bounds, ifd, nr, nw, ofd; 531 char *rawp, path[MAXPATHLEN]; 532 533 ofd = -1; 534 /* 535 * Get the current number and update the bounds file. Do the update 536 * now, because may fail later and don't want to overwrite anything. 537 */ 538 umask(066); 539 (void)snprintf(path, sizeof(path), "%s/bounds", dirname); 540 if ((fp = fopen(path, "r")) == NULL) 541 goto err1; 542 if (fgets(buf, sizeof(buf), fp) == NULL) { 543 if (ferror(fp)) 544 err1: syslog(LOG_WARNING, "%s: %m", path); 545 bounds = 0; 546 } else 547 bounds = atoi(buf); 548 if (fp != NULL) 549 (void)fclose(fp); 550 if ((fp = fopen(path, "w")) == NULL) 551 syslog(LOG_ERR, "%s: %m", path); 552 else { 553 (void)fprintf(fp, "%d\n", bounds + 1); 554 (void)fclose(fp); 555 } 556 557 /* Create the core file. */ 558 (void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s", 559 dirname, bounds, compress ? ".gz" : ""); 560 if (compress) { 561 if ((fp = zopen(path, gzmode)) == NULL) { 562 syslog(LOG_ERR, "%s: %m", path); 563 exit(1); 564 } 565 } else { 566 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 567 fp = fdopen(ofd, "w"); 568 if (fp == NULL) { 569 syslog(LOG_ERR, "%s: fdopen: %m", path); 570 exit(1); 571 } 572 } 573 574 if (dumpcdev == NODEV) { 575 /* Open the raw device. */ 576 rawp = rawname(ddname); 577 if ((ifd = open(rawp, O_RDONLY)) == -1) { 578 syslog(LOG_WARNING, "%s: %m; using block device", 579 rawp); 580 ifd = dumpfd; 581 } 582 } else { 583 rawp = ddname; 584 ifd = dumpfd; 585 } 586 587 /* Seek to the start of the core. */ 588 Lseek(ifd, dumplo, SEEK_SET); 589 590 if (kvm_dump_wrtheader(kd_dump, fp, (int32_t)dumpbytes) == -1) { 591 syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path, 592 kvm_geterr(kd_dump)); 593 exit(1); 594 } 595 596 /* Copy the core file. */ 597 syslog(LOG_NOTICE, "writing %score to %s", 598 compress ? "compressed " : "", path); 599 for (; dumpbytes > (off_t)0; dumpbytes -= (off_t)nr) { 600 char nbuf[7]; 601 humanize_number(nbuf, 7, dumpbytes, "", HN_AUTOSCALE, 0); 602 (void)printf("%7s\r", nbuf); 603 (void)fflush(stdout); 604 nr = read(ifd, buf, MIN(dumpbytes, sizeof(buf))); 605 if (nr <= 0) { 606 if (nr == 0) 607 syslog(LOG_WARNING, 608 "WARNING: EOF on dump device"); 609 else 610 syslog(LOG_ERR, "%s: %m", rawp); 611 goto err2; 612 } 613 nw = fwrite(buf, 1, nr, fp); 614 if (nw != nr) { 615 syslog(LOG_ERR, "%s: %s", 616 path, strerror(nw == 0 ? EIO : errno)); 617 err2: syslog(LOG_WARNING, 618 "WARNING: core may be incomplete"); 619 (void)printf("\n"); 620 exit(1); 621 } 622 } 623 if (dumpcdev == NODEV) 624 (void)close(ifd); 625 (void)fclose(fp); 626 627 /* Copy the kernel. */ 628 ifd = Open(kernel, O_RDONLY); 629 (void)snprintf(path, sizeof(path), "%s/netbsd.%d%s", 630 dirname, bounds, compress ? ".gz" : ""); 631 if (compress) { 632 if ((fp = zopen(path, gzmode)) == NULL) { 633 syslog(LOG_ERR, "%s: %m", path); 634 exit(1); 635 } 636 } else 637 ofd = Create(path, S_IRUSR | S_IWUSR); 638 syslog(LOG_NOTICE, "writing %skernel to %s", 639 compress ? "compressed " : "", path); 640 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 641 if (compress) 642 nw = fwrite(buf, 1, nr, fp); 643 else 644 nw = write(ofd, buf, nr); 645 if (nw != nr) { 646 syslog(LOG_ERR, "%s: %s", 647 path, strerror(nw == 0 ? EIO : errno)); 648 syslog(LOG_WARNING, 649 "WARNING: kernel may be incomplete"); 650 exit(1); 651 } 652 } 653 if (nr < 0) { 654 syslog(LOG_ERR, "%s: %m", kernel); 655 syslog(LOG_WARNING, "WARNING: kernel may be incomplete"); 656 exit(1); 657 } 658 if (compress) 659 (void)fclose(fp); 660 else 661 (void)close(ofd); 662 663 /* 664 * For development systems where the crash occurs during boot 665 * to multiuser. 666 */ 667 sync(); 668 sleep(1); 669 sync(); 670 sleep(1); 671 } 672 673 char * 674 find_dev(dev_t dev, int type) 675 { 676 DIR *dfd; 677 struct dirent *dir; 678 struct stat sb; 679 char *dp, device[MAXPATHLEN + 1], *p; 680 size_t l; 681 682 if ((dfd = opendir(_PATH_DEV)) == NULL) { 683 syslog(LOG_ERR, "%s: %m", _PATH_DEV); 684 exit(1); 685 } 686 strlcpy(device, _PATH_DEV, sizeof(device)); 687 p = &device[strlen(device)]; 688 l = sizeof(device) - strlen(device); 689 while ((dir = readdir(dfd))) { 690 strlcpy(p, dir->d_name, l); 691 if (lstat(device, &sb)) { 692 syslog(LOG_ERR, "%s: %m", device); 693 continue; 694 } 695 if ((sb.st_mode & S_IFMT) != type) 696 continue; 697 if (dev == sb.st_rdev) { 698 closedir(dfd); 699 if ((dp = strdup(device)) == NULL) { 700 syslog(LOG_ERR, "%m"); 701 exit(1); 702 } 703 return (dp); 704 } 705 } 706 closedir(dfd); 707 syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 708 exit(1); 709 } 710 711 char * 712 rawname(char *s) 713 { 714 char *sl; 715 char name[MAXPATHLEN]; 716 717 if ((sl = strrchr(s, '/')) == NULL || sl[1] == '0') { 718 syslog(LOG_ERR, 719 "can't make raw dump device name from %s", s); 720 return (s); 721 } 722 (void)snprintf(name, sizeof(name), "%.*s/r%s", (int)(sl - s), s, 723 sl + 1); 724 if ((sl = strdup(name)) == NULL) { 725 syslog(LOG_ERR, "%m"); 726 exit(1); 727 } 728 return (sl); 729 } 730 731 int 732 get_crashtime(void) 733 { 734 time_t dumptime; /* Time the dump was taken. */ 735 struct timeval dtime; 736 737 if (KREAD(kd_dump, dump_nl[X_TIME_SECOND].n_value, &dumptime) != 0) { 738 if (KREAD(kd_dump, dump_nl[X_TIME].n_value, &dtime) != 0) { 739 if (verbose) 740 syslog(LOG_WARNING, "kvm_read: %s (and _time_second is not defined also)", kvm_geterr(kd_dump)); 741 return (0); 742 } 743 dumptime = dtime.tv_sec; 744 } 745 if (dumptime == 0) { 746 if (verbose) 747 syslog(LOG_ERR, "dump time is zero"); 748 return (0); 749 } 750 (void)printf("savecore: system went down at %s", ctime(&dumptime)); 751 #define LEEWAY (60 * SECSPERDAY) 752 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 753 (void)printf("dump time is unreasonable\n"); 754 return (0); 755 } 756 return (1); 757 } 758 759 int 760 check_space(void) 761 { 762 FILE *fp; 763 off_t minfree, spacefree, kernelsize, needed; 764 struct stat st; 765 struct statvfs fsbuf; 766 char mbuf[100], path[MAXPATHLEN]; 767 768 if (stat(kernel, &st) < 0) { 769 syslog(LOG_ERR, "%s: %m", kernel); 770 exit(1); 771 } 772 kernelsize = st.st_blocks * S_BLKSIZE; 773 if (statvfs(dirname, &fsbuf) < 0) { 774 syslog(LOG_ERR, "%s: %m", dirname); 775 exit(1); 776 } 777 spacefree = fsbuf.f_bavail; 778 spacefree *= fsbuf.f_frsize; 779 spacefree /= 1024; 780 781 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 782 if ((fp = fopen(path, "r")) == NULL) 783 minfree = 0; 784 else { 785 if (fgets(mbuf, sizeof(mbuf), fp) == NULL) 786 minfree = 0; 787 else 788 minfree = atoi(mbuf); 789 (void)fclose(fp); 790 } 791 792 needed = (dumpbytes + kernelsize) / 1024; 793 if (minfree > 0 && spacefree - needed < minfree) { 794 syslog(LOG_WARNING, 795 "no dump, not enough free space in %s", dirname); 796 return (0); 797 } 798 if (spacefree - needed < minfree) 799 syslog(LOG_WARNING, 800 "dump performed, but free space threshold crossed"); 801 return (1); 802 } 803 804 int 805 Open(const char *name, int rw) 806 { 807 int fd; 808 809 if ((fd = open(name, rw, 0)) < 0) { 810 syslog(LOG_ERR, "%s: %m", name); 811 exit(1); 812 } 813 return (fd); 814 } 815 816 void 817 Lseek(int fd, off_t off, int flag) 818 { 819 off_t ret; 820 821 ret = lseek(fd, off, flag); 822 if (ret == -1) { 823 syslog(LOG_ERR, "lseek: %m"); 824 exit(1); 825 } 826 } 827 828 int 829 Create(char *file, int mode) 830 { 831 int fd; 832 833 fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode); 834 if (fd < 0) { 835 syslog(LOG_ERR, "%s: %m", file); 836 exit(1); 837 } 838 return (fd); 839 } 840 841 void 842 Write(int fd, void *bp, int size) 843 { 844 int n; 845 846 if ((n = write(fd, bp, size)) < size) { 847 syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 848 exit(1); 849 } 850 } 851 852 void 853 usage(void) 854 { 855 (void)syslog(LOG_ERR, 856 "usage: savecore [-cfnvz] [-N system] [-Z level] directory"); 857 exit(1); 858 } 859
Indexes created Thu Sep 25 16:09:42 GMT 2025