| 1 | /* |
| 2 | * Copyright (c) 1980,1986 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | */ |
| 6 | |
| 7 | #ifndef lint |
| 8 | char copyright[] = |
| 9 | "@(#) Copyright (c) 1980,1986 Regents of the University of California.\n\ |
| 10 | All rights reserved.\n"; |
| 11 | #endif not lint |
| 12 | |
| 13 | #ifndef lint |
| 14 | static char sccsid[] = "@(#)savecore.c 5.12 (Berkeley) %G%"; |
| 15 | #endif not lint |
| 16 | |
| 17 | /* |
| 18 | * savecore |
| 19 | */ |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <nlist.h> |
| 23 | #include <sys/param.h> |
| 24 | #include <sys/dir.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <sys/time.h> |
| 27 | #include <sys/file.h> |
| 28 | #include <sys/syslog.h> |
| 29 | |
| 30 | #define DAY (60L*60L*24L) |
| 31 | #define LEEWAY (3*DAY) |
| 32 | |
| 33 | #define eq(a,b) (!strcmp(a,b)) |
| 34 | #ifdef vax |
| 35 | #define ok(number) ((number)&0x7fffffff) |
| 36 | #else |
| 37 | #ifdef tahoe |
| 38 | #define ok(number) ((number)&~0xc0000000) |
| 39 | #else |
| 40 | #define ok(number) (number) |
| 41 | #endif |
| 42 | #endif |
| 43 | |
| 44 | struct nlist current_nl[] = { /* namelist for currently running system */ |
| 45 | #define X_DUMPDEV 0 |
| 46 | { "_dumpdev" }, |
| 47 | #define X_DUMPLO 1 |
| 48 | { "_dumplo" }, |
| 49 | #define X_TIME 2 |
| 50 | { "_time" }, |
| 51 | #define X_DUMPSIZE 3 |
| 52 | { "_dumpsize" }, |
| 53 | #define X_VERSION 4 |
| 54 | { "_version" }, |
| 55 | #define X_PANICSTR 5 |
| 56 | { "_panicstr" }, |
| 57 | #define X_DUMPMAG 6 |
| 58 | { "_dumpmag" }, |
| 59 | { "" }, |
| 60 | }; |
| 61 | |
| 62 | struct nlist dump_nl[] = { /* name list for dumped system */ |
| 63 | { "_dumpdev" }, /* entries MUST be the same as */ |
| 64 | { "_dumplo" }, /* those in current_nl[] */ |
| 65 | { "_time" }, |
| 66 | { "_dumpsize" }, |
| 67 | { "_version" }, |
| 68 | { "_panicstr" }, |
| 69 | { "_dumpmag" }, |
| 70 | { "" }, |
| 71 | }; |
| 72 | |
| 73 | char *system; |
| 74 | char *dirname; /* directory to save dumps in */ |
| 75 | char *ddname; /* name of dump device */ |
| 76 | char *find_dev(); |
| 77 | dev_t dumpdev; /* dump device */ |
| 78 | time_t dumptime; /* time the dump was taken */ |
| 79 | int dumplo; /* where dump starts on dumpdev */ |
| 80 | int dumpsize; /* amount of memory dumped */ |
| 81 | int dumpmag; /* magic number in dump */ |
| 82 | time_t now; /* current date */ |
| 83 | char *path(); |
| 84 | char *malloc(); |
| 85 | char *ctime(); |
| 86 | char vers[80]; |
| 87 | char core_vers[80]; |
| 88 | char panic_mesg[80]; |
| 89 | int panicstr; |
| 90 | off_t lseek(); |
| 91 | off_t Lseek(); |
| 92 | int Verbose; |
| 93 | int force; |
| 94 | int clear; |
| 95 | extern int errno; |
| 96 | |
| 97 | main(argc, argv) |
| 98 | char **argv; |
| 99 | int argc; |
| 100 | { |
| 101 | char *cp; |
| 102 | |
| 103 | argc--, argv++; |
| 104 | while (argc > 0 && argv[0][0] == '-') { |
| 105 | for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { |
| 106 | |
| 107 | case 'f': |
| 108 | force++; |
| 109 | break; |
| 110 | |
| 111 | case 'v': |
| 112 | Verbose++; |
| 113 | break; |
| 114 | |
| 115 | case 'c': |
| 116 | clear++; |
| 117 | break; |
| 118 | |
| 119 | default: |
| 120 | usage: |
| 121 | fprintf(stderr, |
| 122 | "usage: savecore [-f] [-v] dirname [ system ]\n"); |
| 123 | exit(1); |
| 124 | } |
| 125 | argc--, argv++; |
| 126 | } |
| 127 | if (argc != 1 && argc != 2) |
| 128 | goto usage; |
| 129 | dirname = argv[0]; |
| 130 | if (argc == 2) |
| 131 | system = argv[1]; |
| 132 | openlog("savecore", LOG_ODELAY, LOG_AUTH); |
| 133 | if (access(dirname, W_OK) < 0) { |
| 134 | Perror(LOG_ERR, "%s: %m", dirname); |
| 135 | exit(1); |
| 136 | } |
| 137 | read_kmem(); |
| 138 | } |
| 139 | |
| 140 | dump_exists() |
| 141 | { |
| 142 | register int dumpfd; |
| 143 | int word; |
| 144 | |
| 145 | dumpfd = Open(ddname, O_RDONLY); |
| 146 | Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); |
| 147 | Read(dumpfd, (char *)&word, sizeof (word)); |
| 148 | close(dumpfd); |
| 149 | if (Verbose && word != dumpmag) { |
| 150 | printf("dumplo = %d (%d bytes)\n", dumplo/DEV_BSIZE, dumplo); |
| 151 | printf("magic number mismatch: %x != %x\n", word, dumpmag); |
| 152 | } |
| 153 | return (word == dumpmag); |
| 154 | } |
| 155 | |
| 156 | clear_dump() |
| 157 | { |
| 158 | register int dumpfd; |
| 159 | int zero = 0; |
| 160 | |
| 161 | dumpfd = Open(ddname, O_WRONLY); |
| 162 | Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); |
| 163 | Write(dumpfd, (char *)&zero, sizeof (zero)); |
| 164 | close(dumpfd); |
| 165 | } |
| 166 | |
| 167 | char * |
| 168 | find_dev(dev, type) |
| 169 | register dev_t dev; |
| 170 | register int type; |
| 171 | { |
| 172 | struct stat statb; |
| 173 | char *dp; |
| 174 | |
| 175 | strcpy(devname, "/dev/"); |
| 176 | if (stat(devname, &statb)) { |
| 177 | perror(devname); |
| 178 | continue; |
| 179 | } |
| 180 | if ((statb.st_mode&S_IFMT) != type) |
| 181 | continue; |
| 182 | if (dev == statb.st_rdev) { |
| 183 | dp = malloc(strlen(devname)+1); |
| 184 | strcpy(dp, devname); |
| 185 | return (dp); |
| 186 | } |
| 187 | } |
| 188 | log(LOG_ERR, "Can't find device %d/%d\n", major(dev), minor(dev)); |
| 189 | exit(1); |
| 190 | /*NOTREACHED*/ |
| 191 | } |
| 192 | |
| 193 | int cursyms[] = |
| 194 | { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 }; |
| 195 | int dumpsyms[] = |
| 196 | { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 }; |
| 197 | read_kmem() |
| 198 | { |
| 199 | register char *cp; |
| 200 | FILE *fp; |
| 201 | char *dump_sys; |
| 202 | int kmem, i; |
| 203 | |
| 204 | dump_sys = system ? system : "/vmunix"; |
| 205 | nlist("/vmunix", current_nl); |
| 206 | nlist(dump_sys, dump_nl); |
| 207 | /* |
| 208 | * Some names we need for the currently running system, |
| 209 | * others for the system that was running when the dump was made. |
| 210 | * The values obtained from the current system are used |
| 211 | * to look for things in /dev/kmem that cannot be found |
| 212 | * in the dump_sys namelist, but are presumed to be the same |
| 213 | * (since the disk partitions are probably the same!) |
| 214 | */ |
| 215 | for (i = 0; cursyms[i] != -1; i++) |
| 216 | if (current_nl[cursyms[i]].n_value == 0) { |
| 217 | log(LOG_ERR, "/vmunix: %s not in namelist\n", |
| 218 | current_nl[cursyms[i]].n_name); |
| 219 | exit(1); |
| 220 | } |
| 221 | for (i = 0; dumpsyms[i] != -1; i++) |
| 222 | if (dump_nl[dumpsyms[i]].n_value == 0) { |
| 223 | log(LOG_ERR, "%s: %s not in namelist\n", dump_sys, |
| 224 | dump_nl[dumpsyms[i]].n_name); |
| 225 | exit(1); |
| 226 | } |
| 227 | kmem = Open("/dev/kmem", O_RDONLY); |
| 228 | Lseek(kmem, (long)current_nl[X_DUMPDEV].n_value, L_SET); |
| 229 | Read(kmem, (char *)&dumpdev, sizeof (dumpdev)); |
| 230 | Lseek(kmem, (long)current_nl[X_DUMPLO].n_value, L_SET); |
| 231 | Read(kmem, (char *)&dumplo, sizeof (dumplo)); |
| 232 | Lseek(kmem, (long)current_nl[X_DUMPMAG].n_value, L_SET); |
| 233 | Read(kmem, (char *)&dumpmag, sizeof (dumpmag)); |
| 234 | dumplo *= DEV_BSIZE; |
| 235 | ddname = find_dev(dumpdev, S_IFBLK); |
| 236 | fp = fdopen(kmem, "r"); |
| 237 | if (fp == NULL) { |
| 238 | log(LOG_ERR, "Couldn't fdopen kmem\n"); |
| 239 | exit(1); |
| 240 | } |
| 241 | if (system) |
| 242 | return; |
| 243 | fseek(fp, (long)current_nl[X_VERSION].n_value, L_SET); |
| 244 | fgets(vers, sizeof (vers), fp); |
| 245 | fclose(fp); |
| 246 | } |
| 247 | |
| 248 | check_kmem() |
| 249 | { |
| 250 | FILE *fp; |
| 251 | register char *cp; |
| 252 | |
| 253 | fp = fopen(ddname, "r"); |
| 254 | if (fp == NULL) { |
| 255 | Perror(LOG_ERR, "%s: %m", ddname); |
| 256 | exit(1); |
| 257 | } |
| 258 | fseek(fp, (off_t)(dumplo+ok(dump_nl[X_VERSION].n_value)), L_SET); |
| 259 | fgets(core_vers, sizeof (core_vers), fp); |
| 260 | fclose(fp); |
| 261 | if (!eq(vers, core_vers) && system == 0) { |
| 262 | log(LOG_WARNING, "Warning: vmunix version mismatch:\n"); |
| 263 | log(LOG_WARNING, "\t%s\n", vers); |
| 264 | log(LOG_WARNING, "and\t%s\n", core_vers); |
| 265 | } |
| 266 | fp = fopen(ddname, "r"); |
| 267 | fseek(fp, (off_t)(dumplo + ok(dump_nl[X_PANICSTR].n_value)), L_SET); |
| 268 | fread((char *)&panicstr, sizeof (panicstr), 1, fp); |
| 269 | if (panicstr) { |
| 270 | fseek(fp, dumplo + ok(panicstr), L_SET); |
| 271 | cp = panic_mesg; |
| 272 | do |
| 273 | *cp = getc(fp); |
| 274 | while (*cp++); |
| 275 | } |
| 276 | fclose(fp); |
| 277 | } |
| 278 | |
| 279 | get_crashtime() |
| 280 | { |
| 281 | int dumpfd; |
| 282 | time_t clobber = (time_t)0; |
| 283 | |
| 284 | dumpfd = Open(ddname, O_RDONLY); |
| 285 | Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_TIME].n_value)), L_SET); |
| 286 | Read(dumpfd, (char *)&dumptime, sizeof dumptime); |
| 287 | close(dumpfd); |
| 288 | if (dumptime == 0) { |
| 289 | if (Verbose) |
| 290 | printf("Dump time is zero.\n"); |
| 291 | return (0); |
| 292 | } |
| 293 | printf("System went down at %s", ctime(&dumptime)); |
| 294 | if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { |
| 295 | printf("dump time is unreasonable\n"); |
| 296 | return (0); |
| 297 | } |
| 298 | return (1); |
| 299 | } |
| 300 | |
| 301 | char * |
| 302 | path(file) |
| 303 | char *file; |
| 304 | { |
| 305 | register char *cp = malloc(strlen(file) + strlen(dirname) + 2); |
| 306 | |
| 307 | (void) strcpy(cp, dirname); |
| 308 | (void) strcat(cp, "/"); |
| 309 | (void) strcat(cp, file); |
| 310 | return (cp); |
| 311 | } |
| 312 | |
| 313 | check_space() |
| 314 | { |
| 315 | struct stat dsb; |
| 316 | register char *ddev; |
| 317 | int dfd, spacefree; |
| 318 | struct fs fs; |
| 319 | |
| 320 | if (stat(dirname, &dsb) < 0) { |
| 321 | Perror(LOG_ERR, "%s: %m", dirname); |
| 322 | exit(1); |
| 323 | } |
| 324 | ddev = find_dev(dsb.st_dev, S_IFBLK); |
| 325 | dfd = Open(ddev, O_RDONLY); |
| 326 | Lseek(dfd, SBOFF, L_SET); |
| 327 | Read(dfd, (char *)&fs, sizeof (fs)); |
| 328 | close(dfd); |
| 329 | spacefree = freespace(&fs, fs.fs_minfree) * fs.fs_fsize / 1024; |
| 330 | if (spacefree < read_number("minfree")) { |
| 331 | log(LOG_WARNING, "Dump omitted, not enough space on device\n"); |
| 332 | return (0); |
| 333 | } |
| 334 | if (freespace(&fs, fs.fs_minfree) < 0) |
| 335 | log(LOG_WARNING, |
| 336 | "Dump performed, but free space threshold crossed\n"); |
| 337 | return (1); |
| 338 | } |
| 339 | |
| 340 | read_number(fn) |
| 341 | char *fn; |
| 342 | { |
| 343 | char lin[80]; |
| 344 | register FILE *fp; |
| 345 | |
| 346 | fp = fopen(path(fn), "r"); |
| 347 | if (fp == NULL) |
| 348 | return (0); |
| 349 | if (fgets(lin, 80, fp) == NULL) { |
| 350 | fclose(fp); |
| 351 | return (0); |
| 352 | } |
| 353 | fclose(fp); |
| 354 | return (atoi(lin)); |
| 355 | } |
| 356 | |
| 357 | #define BUFPAGES (256*1024/NBPG) /* 1/4 Mb */ |
| 358 | |
| 359 | save_core() |
| 360 | { |
| 361 | register int n; |
| 362 | register char *cp; |
| 363 | register int ifd, ofd, bounds; |
| 364 | register FILE *fp; |
| 365 | |
| 366 | cp = malloc(BUFPAGES*NBPG); |
| 367 | if (cp == 0) { |
| 368 | fprintf(stderr, "savecore: Can't allocate i/o buffer.\n"); |
| 369 | return; |
| 370 | } |
| 371 | bounds = read_number("bounds"); |
| 372 | ifd = Open(system?system:"/vmunix", O_RDONLY); |
| 373 | while((n = Read(ifd, cp, BUFSIZ)) > 0) |
| 374 | Write(ofd, cp, n); |
| 375 | close(ifd); |
| 376 | close(ofd); |
| 377 | ifd = Open(ddname, O_RDONLY); |
| 378 | Lseek(ifd, (off_t)(dumplo + ok(dump_nl[X_DUMPSIZE].n_value)), L_SET); |
| 379 | Read(ifd, (char *)&dumpsize, sizeof (dumpsize)); |
| 380 | sprintf(cp, "vmcore.%d", bounds); |
| 381 | ofd = Create(path(cp), 0644); |
| 382 | Lseek(ifd, (off_t)dumplo, L_SET); |
| 383 | log(LOG_NOTICE, "Saving %d bytes of image in vmcore.%d\n", |
| 384 | NBPG*dumpsize, bounds); |
| 385 | while (dumpsize > 0) { |
| 386 | n = Read(ifd, cp, |
| 387 | (dumpsize > BUFPAGES ? BUFPAGES : dumpsize) * NBPG); |
| 388 | if (n == 0) { |
| 389 | log(LOG_WARNING, "WARNING: vmcore may be incomplete\n"); |
| 390 | break; |
| 391 | } |
| 392 | Write(ofd, cp, n); |
| 393 | dumpsize -= n/NBPG; |
| 394 | } |
| 395 | close(ifd); |
| 396 | close(ofd); |
| 397 | fp = fopen(path("bounds"), "w"); |
| 398 | fprintf(fp, "%d\n", bounds+1); |
| 399 | fclose(fp); |
| 400 | free(cp); |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Versions of std routines that exit on error. |
| 405 | */ |
| 406 | Open(name, rw) |
| 407 | char *name; |
| 408 | int rw; |
| 409 | { |
| 410 | int fd; |
| 411 | |
| 412 | fd = open(name, rw); |
| 413 | if (fd < 0) { |
| 414 | Perror(LOG_ERR, "%s: %m", name); |
| 415 | exit(1); |
| 416 | } |
| 417 | return (fd); |
| 418 | } |
| 419 | |
| 420 | Read(fd, buff, size) |
| 421 | int fd, size; |
| 422 | char *buff; |
| 423 | { |
| 424 | int ret; |
| 425 | |
| 426 | ret = read(fd, buff, size); |
| 427 | if (ret < 0) { |
| 428 | Perror(LOG_ERR, "read: %m"); |
| 429 | exit(1); |
| 430 | } |
| 431 | return (ret); |
| 432 | } |
| 433 | |
| 434 | off_t |
| 435 | Lseek(fd, off, flag) |
| 436 | int fd, flag; |
| 437 | long off; |
| 438 | { |
| 439 | long ret; |
| 440 | |
| 441 | ret = lseek(fd, off, flag); |
| 442 | if (ret == -1) { |
| 443 | Perror(LOG_ERR, "lseek: %m"); |
| 444 | exit(1); |
| 445 | } |
| 446 | return (ret); |
| 447 | } |
| 448 | |
| 449 | Create(file, mode) |
| 450 | char *file; |
| 451 | int mode; |
| 452 | { |
| 453 | register int fd; |
| 454 | |
| 455 | fd = creat(file, mode); |
| 456 | if (fd < 0) { |
| 457 | Perror(LOG_ERR, "%s: %m", file); |
| 458 | exit(1); |
| 459 | } |
| 460 | return (fd); |
| 461 | } |
| 462 | |
| 463 | Write(fd, buf, size) |
| 464 | int fd, size; |
| 465 | char *buf; |
| 466 | { |
| 467 | |
| 468 | if (write(fd, buf, size) < size) { |
| 469 | Perror(LOG_ERR, "write: %m"); |
| 470 | exit(1); |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | log(level, msg, a1, a2) |
| 475 | int level; |
| 476 | char *msg; |
| 477 | { |
| 478 | |
| 479 | fprintf(stderr, msg, a1, a2); |
| 480 | syslog(level, msg, a1, a2); |
| 481 | } |
| 482 | |
| 483 | Perror(level, msg, s) |
| 484 | int level; |
| 485 | char *msg; |
| 486 | { |
| 487 | int oerrno = errno; |
| 488 | |
| 489 | perror(s); |
| 490 | errno = oerrno; |
| 491 | syslog(level, msg, s); |
| 492 | } |