savecore.c revision 1.86
1 /* $NetBSD: savecore.c,v 1.86 2013/05/13 18:44:11 christos 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 1.86 2013/05/13 18:44:11 christos Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #define _KSYMS_PRIVATE 47 48 #include <stdbool.h> 49 50 #include <sys/param.h> 51 #include <sys/mount.h> 52 #include <sys/msgbuf.h> 53 #include <sys/syslog.h> 54 #include <sys/time.h> 55 #include <sys/ksyms.h> 56 57 #include <dirent.h> 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <nlist.h> 61 #include <paths.h> 62 #include <stddef.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <time.h> 67 #include <tzfile.h> 68 #include <unistd.h> 69 #include <util.h> 70 #include <limits.h> 71 #include <stdarg.h> 72 #include <kvm.h> 73 74 extern FILE *zopen(const char *fname, const char *mode); 75 76 #define KREAD(kd, addr, p)\ 77 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 78 79 static struct nlist current_nl[] = { /* Namelist for currently running system. */ 80 #define X_DUMPDEV 0 81 { .n_name = "_dumpdev" }, 82 #define X_DUMPLO 1 83 { .n_name = "_dumplo" }, 84 #define X_TIME_SECOND 2 85 { .n_name = "_time_second" }, 86 #define X_TIME 3 87 { .n_name = "_time" }, 88 #define X_DUMPSIZE 4 89 { .n_name = "_dumpsize" }, 90 #define X_VERSION 5 91 { .n_name = "_version" }, 92 #define X_DUMPMAG 6 93 { .n_name = "_dumpmag" }, 94 #define X_PANICSTR 7 95 { .n_name = "_panicstr" }, 96 #define X_PANICSTART 8 97 { .n_name = "_panicstart" }, 98 #define X_PANICEND 9 99 { .n_name = "_panicend" }, 100 #define X_MSGBUF 10 101 { .n_name = "_msgbufp" }, 102 #define X_DUMPCDEV 11 103 { .n_name = "_dumpcdev" }, 104 #define X_SYMSZ 12 105 { .n_name = "_ksyms_symsz" }, 106 #define X_STRSZ 13 107 { .n_name = "_ksyms_strsz" }, 108 #define X_KHDR 14 109 { .n_name = "_ksyms_hdr" }, 110 #define X_SYMTABS 15 111 { .n_name = "_ksyms_symtabs" }, 112 { .n_name = NULL }, 113 }; 114 static int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, X_DUMPCDEV, -1 }; 115 static int dumpsyms[] = { X_TIME_SECOND, X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, 116 X_DUMPMAG, X_SYMSZ, X_STRSZ, X_KHDR, X_SYMTABS, -1 }; 117 118 static struct nlist dump_nl[] = { /* Name list for dumped system. */ 119 { .n_name = "_dumpdev" }, /* Entries MUST be the same as */ 120 { .n_name = "_dumplo" }, /* those in current_nl[]. */ 121 { .n_name = "_time_second" }, 122 { .n_name = "_time" }, 123 { .n_name = "_dumpsize" }, 124 { .n_name = "_version" }, 125 { .n_name = "_dumpmag" }, 126 { .n_name = "_panicstr" }, 127 { .n_name = "_panicstart" }, 128 { .n_name = "_panicend" }, 129 { .n_name = "_msgbufp" }, 130 { .n_name = "_dumpcdev" }, 131 { .n_name = "_ksyms_symsz" }, 132 { .n_name = "_ksyms_strsz" }, 133 { .n_name = "_ksyms_hdr" }, 134 { .n_name = "_ksyms_symtabs" }, 135 { .n_name = NULL }, 136 }; 137 138 /* Types match kernel declarations. */ 139 static off_t dumplo; /* where dump starts on dumpdev */ 140 static u_int32_t dumpmag; /* magic number in dump */ 141 static int dumpsize; /* amount of memory dumped */ 142 static off_t dumpbytes; /* in bytes */ 143 144 static const char *kernel; /* name of used kernel */ 145 static const char *dirname; /* directory to save dumps in */ 146 static char *ddname; /* name of dump device */ 147 static dev_t dumpdev; /* dump device */ 148 static dev_t dumpcdev = NODEV; /* dump device (char equivalent) */ 149 static int dumpfd; /* read/write descriptor on dev */ 150 static kvm_t *kd_dump; /* kvm descriptor on dev */ 151 static time_t now; /* current date */ 152 static char panic_mesg[1024]; 153 static long panicstr; 154 static char vers[1024]; 155 static char gzmode[3]; 156 157 static void check_kmem(void); 158 static int check_space(void); 159 static void clear_dump(void); 160 static int Create(char *, int); 161 static int dump_exists(int); 162 static char *find_dev(dev_t, mode_t); 163 static int get_crashtime(void); 164 static void kmem_setup(int); 165 static void Lseek(int, off_t, int); 166 static int Open(const char *, int rw); 167 static void save_core(int); 168 __dead static void usage(const char *fmt, ...) __printflike(1, 2); 169 170 int 171 main(int argc, char *argv[]) 172 { 173 int ch, level, testonly, compress, force, clear, verbose; 174 char *ep; 175 176 kernel = NULL; 177 level = 1; /* default to fastest gzip compression */ 178 force = 0; 179 clear = 0; 180 testonly = 0; 181 verbose = 0; 182 compress = 0; 183 gzmode[0] = 'w'; 184 185 openlog("savecore", LOG_PERROR, LOG_DAEMON); 186 187 while ((ch = getopt(argc, argv, "cdfnN:vzZ:")) != -1) 188 switch(ch) { 189 case 'c': 190 clear = 1; 191 break; 192 case 'd': /* Not documented. */ 193 case 'v': 194 verbose = 1; 195 break; 196 case 'f': 197 force = 1; 198 break; 199 case 'n': 200 testonly = 1; 201 break; 202 case 'N': 203 kernel = optarg; 204 break; 205 case 'z': 206 compress = 1; 207 break; 208 case 'Z': 209 level = (int)strtol(optarg, &ep, 10); 210 if (level < 0 || level > 9) 211 usage("Invalid compression `%s'", optarg); 212 break; 213 case '?': 214 usage("Missing argument for flag `%c'", optopt); 215 default: 216 usage("Unknown flag `%c'", ch); 217 } 218 argc -= optind; 219 argv += optind; 220 221 if (argc != 0) 222 dirname = argv[0]; 223 else 224 dirname = "/var/crash"; 225 226 gzmode[1] = level + '0'; 227 228 (void)time(&now); 229 kmem_setup(verbose); 230 231 if (clear && !testonly) { 232 clear_dump(); 233 exit(0); 234 } 235 236 if (!dump_exists(verbose) && !force) 237 exit(1); 238 239 if (testonly) 240 /* If -n was passed and there was a dump, exit at level 0 */ 241 exit(0); 242 243 check_kmem(); 244 245 if (panicstr) 246 syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); 247 else 248 syslog(LOG_ALERT, "reboot"); 249 250 if ((!get_crashtime() || !check_space()) && !force) 251 exit(1); 252 253 save_core(compress); 254 255 clear_dump(); 256 exit(0); 257 } 258 259 static void 260 kmem_setup(int verbose) 261 { 262 kvm_t *kd_kern; 263 char errbuf[_POSIX2_LINE_MAX]; 264 int i, hdrsz; 265 266 /* 267 * Some names we need for the currently running system, others for 268 * the system that was running when the dump was made. The values 269 * obtained from the current system are used to look for things in 270 * /dev/kmem that cannot be found in the kernel namelist, but are 271 * presumed to be the same (since the disk partitions are probably 272 * the same!) 273 */ 274 kd_kern = kvm_openfiles(kernel, NULL, NULL, O_RDONLY, errbuf); 275 if (kd_kern == NULL) { 276 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 277 exit(1); 278 } 279 if (kvm_nlist(kd_kern, current_nl) == -1) 280 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 281 kvm_geterr(kd_kern)); 282 283 for (i = 0; cursyms[i] != -1; i++) { 284 if (current_nl[cursyms[i]].n_value != 0) 285 continue; 286 switch (cursyms[i]) { 287 case X_TIME_SECOND: 288 case X_TIME: 289 case X_DUMPCDEV: 290 break; 291 default: 292 syslog(LOG_ERR, "%s: %s not in namelist", 293 kernel, current_nl[cursyms[i]].n_name); 294 exit(1); 295 } 296 } 297 298 if (KREAD(kd_kern, current_nl[X_DUMPDEV].n_value, &dumpdev) != 0) { 299 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 300 exit(1); 301 } 302 if (dumpdev == NODEV) { 303 syslog(LOG_WARNING, "no core dump (no dumpdev)"); 304 exit(1); 305 } 306 { 307 long l_dumplo; 308 309 if (KREAD(kd_kern, current_nl[X_DUMPLO].n_value, &l_dumplo) != 0) { 310 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 311 exit(1); 312 } 313 if (l_dumplo == -1) { 314 syslog(LOG_WARNING, "no core dump (invalid dumplo)"); 315 exit(1); 316 } 317 dumplo = DEV_BSIZE * (off_t) l_dumplo; 318 } 319 320 if (verbose) 321 (void)printf("dumplo = %lld (%ld * %ld)\n", 322 (long long)dumplo, (long)(dumplo / DEV_BSIZE), (long)DEV_BSIZE); 323 if (KREAD(kd_kern, current_nl[X_DUMPMAG].n_value, &dumpmag) != 0) { 324 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern)); 325 exit(1); 326 } 327 328 (void)kvm_read(kd_kern, current_nl[X_VERSION].n_value, vers, 329 sizeof(vers)); 330 vers[sizeof(vers) - 1] = '\0'; 331 332 if (current_nl[X_DUMPCDEV].n_value != 0) { 333 if (KREAD(kd_kern, current_nl[X_DUMPCDEV].n_value, 334 &dumpcdev) != 0) { 335 syslog(LOG_WARNING, "kvm_read: %s", 336 kvm_geterr(kd_kern)); 337 exit(1); 338 } 339 ddname = find_dev(dumpcdev, S_IFCHR); 340 } else 341 ddname = find_dev(dumpdev, S_IFBLK); 342 if (strncmp(ddname, "/dev/cons", 8) == 0 || 343 strncmp(ddname, "/dev/tty", 7) == 0 || 344 strncmp(ddname, "/dev/pty", 7) == 0 || 345 strncmp(ddname, "/dev/pts", 7) == 0) { 346 syslog(LOG_ERR, "dumpdev %s is tty; override kernel", ddname); 347 exit(1); 348 } 349 dumpfd = Open(ddname, O_RDWR); 350 351 kd_dump = kvm_openfiles(kernel, ddname, NULL, O_RDWR, errbuf); 352 if (kd_dump == NULL) { 353 syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf); 354 exit(1); 355 } 356 357 if (kvm_nlist(kd_dump, dump_nl) == -1) 358 syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel, 359 kvm_geterr(kd_dump)); 360 361 for (i = 0; dumpsyms[i] != -1; i++) 362 if (dump_nl[dumpsyms[i]].n_value == 0 && 363 dumpsyms[i] != X_TIME_SECOND && 364 dumpsyms[i] != X_TIME) { 365 syslog(LOG_ERR, "%s: %s not in namelist", 366 kernel, dump_nl[dumpsyms[i]].n_name); 367 exit(1); 368 } 369 hdrsz = kvm_dump_mkheader(kd_dump, dumplo); 370 371 /* 372 * If 'hdrsz' == 0, kvm_dump_mkheader() failed on the magic-number 373 * checks, ergo no dump is present... 374 */ 375 if (hdrsz == 0) { 376 syslog(LOG_WARNING, "no core dump"); 377 exit(1); 378 } 379 if (hdrsz == -1) { 380 syslog(LOG_ERR, "%s: kvm_dump_mkheader: %s", kernel, 381 kvm_geterr(kd_dump)); 382 exit(1); 383 } 384 dumplo += hdrsz; 385 kvm_close(kd_kern); 386 } 387 388 static void 389 check_kmem(void) 390 { 391 char *cp, *bufdata; 392 struct kern_msgbuf msgbuf, *bufp; 393 long panicloc, panicstart, panicend; 394 char core_vers[1024]; 395 396 (void)kvm_read(kd_dump, dump_nl[X_VERSION].n_value, core_vers, 397 sizeof(core_vers)); 398 core_vers[sizeof(core_vers) - 1] = '\0'; 399 400 if (strcmp(vers, core_vers) != 0) 401 syslog(LOG_WARNING, 402 "warning: %s version mismatch:\n\t%s\nand\t%s\n", 403 kvm_getkernelname(kd_dump), vers, core_vers); 404 405 panicstart = panicend = 0; 406 if (KREAD(kd_dump, dump_nl[X_PANICSTART].n_value, &panicstart) != 0) { 407 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 408 goto nomsguf; 409 } 410 if (KREAD(kd_dump, dump_nl[X_PANICEND].n_value, &panicend) != 0) { 411 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 412 goto nomsguf; 413 } 414 if (panicstart != 0 && panicend != 0) { 415 if (KREAD(kd_dump, dump_nl[X_MSGBUF].n_value, &bufp)) { 416 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 417 goto nomsguf; 418 } 419 if (kvm_read(kd_dump, (long)bufp, &msgbuf, 420 offsetof(struct kern_msgbuf, msg_bufc)) != 421 offsetof(struct kern_msgbuf, msg_bufc)) { 422 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 423 goto nomsguf; 424 } 425 if (msgbuf.msg_magic != MSG_MAGIC) { 426 syslog(LOG_WARNING, "msgbuf magic incorrect"); 427 goto nomsguf; 428 } 429 bufdata = malloc(msgbuf.msg_bufs); 430 if (bufdata == NULL) { 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 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 437 free(bufdata); 438 goto nomsguf; 439 } 440 cp = panic_mesg; 441 while (panicstart != panicend && cp < &panic_mesg[sizeof(panic_mesg)-1]) { 442 *cp++ = bufdata[panicstart]; 443 panicstart++; 444 if (panicstart >= msgbuf.msg_bufs) 445 panicstart = 0; 446 } 447 /* Don't end in a new-line */ 448 cp = &panic_mesg[strlen(panic_mesg)] - 1; 449 if (*cp == '\n') 450 *cp = '\0'; 451 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 452 free(bufdata); 453 454 panicstr = 1; /* anything not zero */ 455 return; 456 } 457 nomsguf: 458 if (KREAD(kd_dump, dump_nl[X_PANICSTR].n_value, &panicstr) != 0) { 459 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 460 return; 461 } 462 if (panicstr) { 463 cp = panic_mesg; 464 panicloc = panicstr; 465 do { 466 if (KREAD(kd_dump, panicloc, cp) != 0) { 467 syslog(LOG_WARNING, "kvm_read: %s", 468 kvm_geterr(kd_dump)); 469 break; 470 } 471 panicloc++; 472 } while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)-1]); 473 panic_mesg[sizeof(panic_mesg) - 1] = '\0'; 474 } 475 } 476 477 static int 478 dump_exists(int verbose) 479 { 480 u_int32_t newdumpmag; 481 482 if (KREAD(kd_dump, dump_nl[X_DUMPMAG].n_value, &newdumpmag) != 0) { 483 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 484 return (0); 485 } 486 487 /* Read the dump size. */ 488 if (KREAD(kd_dump, dump_nl[X_DUMPSIZE].n_value, &dumpsize) != 0) { 489 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 490 return (0); 491 } 492 dumpbytes = (off_t)dumpsize * getpagesize(); 493 494 /* 495 * Return zero if core dump doesn't seem to be there, and note 496 * it for syslog. This check and return happens after the dump size 497 * is read, so dumpsize is whether or not the core is valid (for -f). 498 */ 499 if (newdumpmag != dumpmag) { 500 if (verbose) 501 syslog(LOG_WARNING, "magic number mismatch " 502 "(0x%x != 0x%x)", newdumpmag, dumpmag); 503 syslog(LOG_WARNING, "no core dump"); 504 return (0); 505 } 506 return (1); 507 } 508 509 static void 510 clear_dump(void) 511 { 512 if (kvm_dump_inval(kd_dump) == -1) 513 syslog(LOG_ERR, "%s: kvm_dump_inval: %s", ddname, 514 kvm_geterr(kd_dump)); 515 516 } 517 518 static char buf[1024 * 1024]; 519 520 static void 521 save_kernel(FILE *fp, char *path) 522 { 523 int nw, nr, ifd; 524 525 ifd = Open(kernel, O_RDONLY); 526 while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 527 nw = fwrite(buf, 1, nr, fp); 528 if (nw != nr) { 529 syslog(LOG_ERR, "%s: %s", 530 path, strerror(nw == 0 ? EIO : errno)); 531 syslog(LOG_WARNING, 532 "WARNING: kernel may be incomplete"); 533 exit(1); 534 } 535 } 536 if (nr < 0) { 537 syslog(LOG_ERR, "%s: %m", kernel); 538 syslog(LOG_WARNING, "WARNING: kernel may be incomplete"); 539 exit(1); 540 } 541 } 542 543 static int 544 ksymsget(u_long addr, void *ptr, size_t size) 545 { 546 547 if ((size_t)kvm_read(kd_dump, addr, ptr, size) != size) { 548 syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump)); 549 return 1; 550 } 551 return 0; 552 } 553 554 static int 555 save_ksyms(FILE *fp, char *path) 556 { 557 struct ksyms_hdr khdr; 558 int nw, symsz, strsz; 559 TAILQ_HEAD(, ksyms_symtab) symtabs; 560 struct ksyms_symtab st, *stptr; 561 void *p; 562 563 /* Get basic info and ELF headers, check if ksyms was on. */ 564 if (ksymsget(dump_nl[X_KHDR].n_value, &khdr, sizeof(khdr))) 565 return 1; 566 if (ksymsget(dump_nl[X_SYMSZ].n_value, &symsz, sizeof(symsz))) 567 return 1; 568 if (ksymsget(dump_nl[X_STRSZ].n_value, &strsz, sizeof(strsz))) 569 return 1; 570 if (symsz == 0 || strsz == 0) 571 return 1; 572 573 /* Update the ELF section headers for symbols/strings. */ 574 khdr.kh_shdr[SYMTAB].sh_size = symsz; 575 khdr.kh_shdr[SYMTAB].sh_info = symsz / sizeof(Elf_Sym); 576 khdr.kh_shdr[STRTAB].sh_offset = symsz + 577 khdr.kh_shdr[SYMTAB].sh_offset; 578 khdr.kh_shdr[STRTAB].sh_size = strsz; 579 580 /* Write out the ELF headers. */ 581 nw = fwrite(&khdr, 1, sizeof(khdr), fp); 582 if (nw != sizeof(khdr)) { 583 syslog(LOG_ERR, "%s: %s", 584 path, strerror(nw == 0 ? EIO : errno)); 585 syslog(LOG_WARNING, 586 "WARNING: kernel may be incomplete"); 587 exit(1); 588 } 589 590 /* Dump symbol table. */ 591 if (ksymsget(dump_nl[X_SYMTABS].n_value, &symtabs, sizeof(symtabs))) 592 return 1; 593 stptr = TAILQ_FIRST(&symtabs); 594 while (stptr != NULL) { 595 if (ksymsget((u_long)stptr, &st, sizeof(st))) 596 return 1; 597 stptr = TAILQ_NEXT(&st, sd_queue); 598 if ((p = malloc(st.sd_symsize)) == NULL) 599 return 1; 600 if (ksymsget((u_long)st.sd_symstart, p, st.sd_symsize)) { 601 free(p); 602 return 1; 603 } 604 nw = fwrite(p, 1, st.sd_symsize, fp); 605 free(p); 606 if (nw != st.sd_symsize) { 607 syslog(LOG_ERR, "%s: %s", 608 path, strerror(nw == 0 ? EIO : errno)); 609 syslog(LOG_WARNING, 610 "WARNING: kernel may be incomplete"); 611 exit(1); 612 } 613 } 614 615 /* Dump string table. */ 616 if (ksymsget(dump_nl[X_SYMTABS].n_value, &symtabs, sizeof(symtabs))) 617 return 1; 618 stptr = TAILQ_FIRST(&symtabs); 619 while (stptr != NULL) { 620 if (ksymsget((u_long)stptr, &st, sizeof(st))) 621 return 1; 622 stptr = TAILQ_NEXT(&st, sd_queue); 623 if ((p = malloc(st.sd_symsize)) == NULL) 624 return 1; 625 if (ksymsget((u_long)st.sd_strstart, p, st.sd_strsize)) { 626 free(p); 627 return 1; 628 } 629 nw = fwrite(p, 1, st.sd_strsize, fp); 630 free(p); 631 if (nw != st.sd_strsize) { 632 syslog(LOG_ERR, "%s: %s", 633 path, strerror(nw == 0 ? EIO : errno)); 634 syslog(LOG_WARNING, 635 "WARNING: kernel may be incomplete"); 636 exit(1); 637 } 638 } 639 640 return 0; 641 } 642 643 static void 644 save_core(int compress) 645 { 646 FILE *fp; 647 int bounds, ifd, nr, nw, ofd, tryksyms; 648 char path[MAXPATHLEN], rbuf[MAXPATHLEN]; 649 const char *rawp; 650 651 ofd = -1; 652 /* 653 * Get the current number and update the bounds file. Do the update 654 * now, because may fail later and don't want to overwrite anything. 655 */ 656 umask(066); 657 (void)snprintf(path, sizeof(path), "%s/bounds", dirname); 658 if ((fp = fopen(path, "r")) == NULL) 659 goto err1; 660 if (fgets(buf, sizeof(buf), fp) == NULL) { 661 if (ferror(fp)) 662 err1: syslog(LOG_WARNING, "%s: %m", path); 663 bounds = 0; 664 } else 665 bounds = atoi(buf); 666 if (fp != NULL) 667 (void)fclose(fp); 668 if ((fp = fopen(path, "w")) == NULL) 669 syslog(LOG_ERR, "%s: %m", path); 670 else { 671 (void)fprintf(fp, "%d\n", bounds + 1); 672 (void)fclose(fp); 673 } 674 675 /* Create the core file. */ 676 (void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s", 677 dirname, bounds, compress ? ".gz" : ""); 678 if (compress) { 679 if ((fp = zopen(path, gzmode)) == NULL) { 680 syslog(LOG_ERR, "%s: %m", path); 681 exit(1); 682 } 683 } else { 684 ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); 685 fp = fdopen(ofd, "w"); 686 if (fp == NULL) { 687 syslog(LOG_ERR, "%s: fdopen: %m", path); 688 exit(1); 689 } 690 } 691 692 if (dumpcdev == NODEV) { 693 /* Open the raw device. */ 694 rawp = getdiskrawname(rbuf, sizeof(rbuf), ddname); 695 if (rawp == NULL) { 696 syslog(LOG_WARNING, "%s: %m; can't convert to raw", 697 ddname); 698 rawp = ddname; 699 } 700 if ((ifd = open(rawp, O_RDONLY)) == -1) { 701 syslog(LOG_WARNING, "%s: %m; using block device", 702 rawp); 703 ifd = dumpfd; 704 } 705 } else { 706 rawp = ddname; 707 ifd = dumpfd; 708 } 709 710 /* Seek to the start of the core. */ 711 Lseek(ifd, dumplo, SEEK_SET); 712 713 if (kvm_dump_wrtheader(kd_dump, fp, (int32_t)dumpbytes) == -1) { 714 syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path, 715 kvm_geterr(kd_dump)); 716 exit(1); 717 } 718 719 /* Copy the core file. */ 720 syslog(LOG_NOTICE, "writing %score to %s", 721 compress ? "compressed " : "", path); 722 for (; dumpbytes > (off_t)0; dumpbytes -= (off_t)nr) { 723 char nbuf[7]; 724 humanize_number(nbuf, 7, dumpbytes, "", HN_AUTOSCALE, 0); 725 (void)printf("%7s\r", nbuf); 726 (void)fflush(stdout); 727 nr = read(ifd, buf, MIN(dumpbytes, (off_t)sizeof(buf))); 728 if (nr <= 0) { 729 if (nr == 0) 730 syslog(LOG_WARNING, 731 "WARNING: EOF on dump device"); 732 else 733 syslog(LOG_ERR, "%s: %m", rawp); 734 goto err2; 735 } 736 nw = fwrite(buf, 1, nr, fp); 737 if (nw != nr) { 738 syslog(LOG_ERR, "%s: %s", 739 path, strerror(nw == 0 ? EIO : errno)); 740 err2: syslog(LOG_WARNING, 741 "WARNING: core may be incomplete"); 742 (void)printf("\n"); 743 exit(1); 744 } 745 } 746 if (dumpcdev == NODEV) 747 (void)close(ifd); 748 (void)fclose(fp); 749 750 /* Create a kernel. */ 751 (void)snprintf(path, sizeof(path), "%s/netbsd.%d%s", 752 dirname, bounds, compress ? ".gz" : ""); 753 syslog(LOG_NOTICE, "writing %skernel to %s", 754 compress ? "compressed " : "", path); 755 for (tryksyms = 1;; tryksyms = 0) { 756 if (compress) { 757 if ((fp = zopen(path, gzmode)) == NULL) { 758 syslog(LOG_ERR, "%s: %m", path); 759 exit(1); 760 } 761 } else { 762 ofd = Create(path, S_IRUSR | S_IWUSR); 763 fp = fdopen(ofd, "w"); 764 if (fp == NULL) { 765 syslog(LOG_ERR, "fdopen: %m"); 766 exit(1); 767 } 768 } 769 if (tryksyms) { 770 if (!save_ksyms(fp, path)) 771 break; 772 (void)fclose(fp); 773 unlink(path); 774 } else { 775 save_kernel(fp, path); 776 break; 777 } 778 } 779 (void)fclose(fp); 780 781 /* 782 * For development systems where the crash occurs during boot 783 * to multiuser. 784 */ 785 sync(); 786 sleep(1); 787 sync(); 788 sleep(1); 789 } 790 791 static char * 792 find_dev(dev_t dev, mode_t type) 793 { 794 DIR *dfd; 795 struct dirent *dir; 796 struct stat sb; 797 char *dp, device[MAXPATHLEN + 1], *p; 798 size_t l; 799 800 if ((dfd = opendir(_PATH_DEV)) == NULL) { 801 syslog(LOG_ERR, "%s: %m", _PATH_DEV); 802 exit(1); 803 } 804 strlcpy(device, _PATH_DEV, sizeof(device)); 805 p = &device[strlen(device)]; 806 l = sizeof(device) - strlen(device); 807 while ((dir = readdir(dfd))) { 808 strlcpy(p, dir->d_name, l); 809 if (lstat(device, &sb)) { 810 syslog(LOG_ERR, "%s: %m", device); 811 continue; 812 } 813 if ((sb.st_mode & S_IFMT) != type) 814 continue; 815 if (dev == sb.st_rdev) { 816 closedir(dfd); 817 if ((dp = strdup(device)) == NULL) { 818 syslog(LOG_ERR, "%m"); 819 exit(1); 820 } 821 return (dp); 822 } 823 } 824 closedir(dfd); 825 syslog(LOG_ERR, "can't find device %lld/%lld", 826 (long long)major(dev), (long long)minor(dev)); 827 exit(1); 828 } 829 830 static int 831 get_crashtime(void) 832 { 833 time_t dumptime; /* Time the dump was taken. */ 834 struct timeval dtime; 835 836 if (KREAD(kd_dump, dump_nl[X_TIME_SECOND].n_value, &dumptime) != 0) { 837 if (KREAD(kd_dump, dump_nl[X_TIME].n_value, &dtime) != 0) { 838 syslog(LOG_WARNING, "kvm_read: %s (and _time_second " 839 "is not defined also)", kvm_geterr(kd_dump)); 840 return (0); 841 } 842 dumptime = dtime.tv_sec; 843 } 844 if (dumptime == 0) { 845 syslog(LOG_WARNING, "dump time is zero"); 846 return (0); 847 } 848 syslog(LOG_INFO, "system went down at %s", ctime(&dumptime)); 849 #define LEEWAY (60 * SECSPERDAY) 850 if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 851 syslog(LOG_WARNING, "dump time is unreasonable"); 852 return (0); 853 } 854 return (1); 855 } 856 857 static int 858 check_space(void) 859 { 860 FILE *fp; 861 off_t minfree, spacefree, kernelsize, needed; 862 struct stat st; 863 struct statvfs fsbuf; 864 char mbuf[100], path[MAXPATHLEN]; 865 866 /* XXX assume a reasonable default, unless we find a kernel. */ 867 kernelsize = 20 * 1024 * 1024; 868 if (!stat(kernel, &st)) kernelsize = st.st_blocks * S_BLKSIZE; 869 if (statvfs(dirname, &fsbuf) < 0) { 870 syslog(LOG_ERR, "%s: %m", dirname); 871 exit(1); 872 } 873 spacefree = fsbuf.f_bavail; 874 spacefree *= fsbuf.f_frsize; 875 spacefree /= 1024; 876 877 (void)snprintf(path, sizeof(path), "%s/minfree", dirname); 878 if ((fp = fopen(path, "r")) == NULL) 879 minfree = 0; 880 else { 881 if (fgets(mbuf, sizeof(mbuf), fp) == NULL) 882 minfree = 0; 883 else 884 minfree = atoi(mbuf); 885 (void)fclose(fp); 886 } 887 888 needed = (dumpbytes + kernelsize) / 1024; 889 if (minfree > 0 && spacefree - needed < minfree) { 890 syslog(LOG_WARNING, 891 "no dump, not enough free space in %s", dirname); 892 return (0); 893 } 894 if (spacefree - needed < minfree) 895 syslog(LOG_WARNING, 896 "dump performed, but free space threshold crossed"); 897 return (1); 898 } 899 900 static int 901 Open(const char *name, int rw) 902 { 903 int fd; 904 905 if ((fd = open(name, rw, 0)) < 0) { 906 syslog(LOG_ERR, "%s: %m", name); 907 exit(1); 908 } 909 return (fd); 910 } 911 912 static void 913 Lseek(int fd, off_t off, int flag) 914 { 915 off_t ret; 916 917 ret = lseek(fd, off, flag); 918 if (ret == -1) { 919 syslog(LOG_ERR, "lseek: %m"); 920 exit(1); 921 } 922 } 923 924 static int 925 Create(char *file, int mode) 926 { 927 int fd; 928 929 fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode); 930 if (fd < 0) { 931 syslog(LOG_ERR, "%s: %m", file); 932 exit(1); 933 } 934 return (fd); 935 } 936 937 static void 938 usage(const char *fmt, ...) 939 { 940 va_list ap; 941 va_start(ap, fmt); 942 (void)vsyslog(LOG_ERR, fmt, ap); 943 va_end(ap); 944 (void)syslog(LOG_ERR, 945 "Usage: %s [-cfnvz] [-N system] [-Z level] [directory]", 946 getprogname()); 947 exit(1); 948 } 949
Indexes created Wed Sep 24 05:09:52 GMT 2025