sbin/savecore/savecore.c

   1 /*-
   2  * Copyright (c) 2002 Poul-Henning Kamp
   3  * Copyright (c) 2002 Networks Associates Technology, Inc.
   4  * All rights reserved.
   5  *
   6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
   7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
   8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   9  * DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The names of the authors may not be used to endorse or promote
  20  *    products derived from this software without specific prior written
  21  *    permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * Copyright (c) 1986, 1992, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  */
  62
  63 #include <sys/cdefs.h>
  64 __FBSDID("$FreeBSD$");
  65
  66 #include <sys/param.h>
  67 #include <sys/disk.h>
  68 #include <sys/kerneldump.h>
  69 #include <sys/mount.h>
  70 #include <sys/stat.h>
  71 #include <errno.h>
  72 #include <fcntl.h>
  73 #include <fstab.h>
  74 #include <paths.h>
  75 #include <signal.h>
  76 #include <stdarg.h>
  77 #include <stdio.h>
  78 #include <stdlib.h>
  79 #include <string.h>
  80 #include <syslog.h>
  81 #include <time.h>
  82 #include <unistd.h>
  83 #include <libxo/xo.h>
  84
  85 /* The size of the buffer used for I/O. */
  86 #define BUFFERSIZE      (1024*1024)
  87
  88 #define STATUS_BAD      0
  89 #define STATUS_GOOD     1
  90 #define STATUS_UNKNOWN  2
  91
  92 static int checkfor, compress, clear, force, keep, verbose;     /* flags */
  93 static int nfound, nsaved, nerr;                        /* statistics */
  94 static int maxdumps;
  95
  96 extern FILE *zopen(const char *, const char *);
  97
  98 static sig_atomic_t got_siginfo;
  99 static void infohandler(int);
 100
 101 static void
 102 printheader(xo_handle_t *xo, const struct kerneldumpheader *h, const char *device,
 103     int bounds, const int status)
 104 {
 105         uint64_t dumplen;
 106         time_t t;
 107         const char *stat_str;
 108
 109         xo_flush_h(xo);
 110         xo_emit_h(xo, "{Lwc:Dump header from device}{:dump_device/%s}\n", device);
 111         xo_emit_h(xo, "{P:  }{Lwc:Architecture}{:architecture/%s}\n", h->architecture);
 112         xo_emit_h(xo, "{P:  }{Lwc:Architecture Version}{:architecture_version/%u}\n", dtoh32(h->architectureversion));
 113         dumplen = dtoh64(h->dumplength);
 114         xo_emit_h(xo, "{P:  }{Lwc:Dump Length}{:dump_length_bytes/%lld}\n", (long long)dumplen);
 115         xo_emit_h(xo, "{P:  }{Lwc:Blocksize}{:blocksize/%d}\n", dtoh32(h->blocksize));
 116         t = dtoh64(h->dumptime);
 117         xo_emit_h(xo, "{P:  }{Lwc:Dumptime}{:dumptime/%s}", ctime(&t));
 118         xo_emit_h(xo, "{P:  }{Lwc:Hostname}{:hostname/%s}\n", h->hostname);
 119         xo_emit_h(xo, "{P:  }{Lwc:Magic}{:magic/%s}\n", h->magic);
 120         xo_emit_h(xo, "{P:  }{Lwc:Version String}{:version_string/%s}", h->versionstring);
 121         xo_emit_h(xo, "{P:  }{Lwc:Panic String}{:panic_string/%s}\n", h->panicstring);
 122         xo_emit_h(xo, "{P:  }{Lwc:Dump Parity}{:dump_parity/%u}\n", h->parity);
 123         xo_emit_h(xo, "{P:  }{Lwc:Bounds}{:bounds/%d}\n", bounds);
 124
 125         switch(status) {
 126         case STATUS_BAD:
 127                 stat_str = "bad";
 128                 break;
 129         case STATUS_GOOD:
 130                 stat_str = "good";
 131                 break;
 132         default:
 133                 stat_str = "unknown";
 134         }
 135         xo_emit_h(xo, "{P:  }{Lwc:Dump Status}{:dump_status/%s}\n", stat_str);
 136         xo_flush_h(xo);
 137 }
 138
 139 static int
 140 getbounds(void) {
 141         FILE *fp;
 142         char buf[6];
 143         int ret;
 144
 145         ret = 0;
 146
 147         if ((fp = fopen("bounds", "r")) == NULL) {
 148                 if (verbose)
 149                         printf("unable to open bounds file, using 0\n");
 150                 return (ret);
 151         }
 152
 153         if (fgets(buf, sizeof buf, fp) == NULL) {
 154                 if (feof(fp))
 155                         syslog(LOG_WARNING, "bounds file is empty, using 0");
 156                 else
 157                         syslog(LOG_WARNING, "bounds file: %s", strerror(errno));
 158                 fclose(fp);
 159                 return (ret);
 160         }
 161
 162         errno = 0;
 163         ret = (int)strtol(buf, NULL, 10);
 164         if (ret == 0 && (errno == EINVAL || errno == ERANGE))
 165                 syslog(LOG_WARNING, "invalid value found in bounds, using 0");
 166         fclose(fp);
 167         return (ret);
 168 }
 169
 170 static void
 171 writebounds(int bounds) {
 172         FILE *fp;
 173
 174         if ((fp = fopen("bounds", "w")) == NULL) {
 175                 syslog(LOG_WARNING, "unable to write to bounds file: %m");
 176                 return;
 177         }
 178
 179         if (verbose)
 180                 printf("bounds number: %d\n", bounds);
 181
 182         fprintf(fp, "%d\n", bounds);
 183         fclose(fp);
 184 }
 185
 186 static off_t
 187 file_size(const char *path)
 188 {
 189         struct stat sb;
 190
 191         /* Ignore all errors, those file may not exists. */
 192         if (stat(path, &sb) == -1)
 193                 return (0);
 194         return (sb.st_size);
 195 }
 196
 197 static off_t
 198 saved_dump_size(int bounds)
 199 {
 200         static char path[PATH_MAX];
 201         off_t dumpsize;
 202
 203         dumpsize = 0;
 204
 205         (void)snprintf(path, sizeof(path), "info.%d", bounds);
 206         dumpsize += file_size(path);
 207         (void)snprintf(path, sizeof(path), "vmcore.%d", bounds);
 208         dumpsize += file_size(path);
 209         (void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds);
 210         dumpsize += file_size(path);
 211         (void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds);
 212         dumpsize += file_size(path);
 213         (void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds);
 214         dumpsize += file_size(path);
 215
 216         return (dumpsize);
 217 }
 218
 219 static void
 220 saved_dump_remove(int bounds)
 221 {
 222         static char path[PATH_MAX];
 223
 224         (void)snprintf(path, sizeof(path), "info.%d", bounds);
 225         (void)unlink(path);
 226         (void)snprintf(path, sizeof(path), "vmcore.%d", bounds);
 227         (void)unlink(path);
 228         (void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds);
 229         (void)unlink(path);
 230         (void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds);
 231         (void)unlink(path);
 232         (void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds);
 233         (void)unlink(path);
 234 }
 235
 236 static void
 237 symlinks_remove(void)
 238 {
 239
 240         (void)unlink("info.last");
 241         (void)unlink("vmcore.last");
 242         (void)unlink("vmcore.last.gz");
 243         (void)unlink("textdump.tar.last");
 244         (void)unlink("textdump.tar.last.gz");
 245 }
 246
 247 /*
 248  * Check that sufficient space is available on the disk that holds the
 249  * save directory.
 250  */
 251 static int
 252 check_space(const char *savedir, off_t dumpsize, int bounds)
 253 {
 254         FILE *fp;
 255         off_t minfree, spacefree, totfree, needed;
 256         struct statfs fsbuf;
 257         char buf[100];
 258
 259         if (statfs(".", &fsbuf) < 0) {
 260                 syslog(LOG_ERR, "%s: %m", savedir);
 261                 exit(1);
 262         }
 263         spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
 264         totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;
 265
 266         if ((fp = fopen("minfree", "r")) == NULL)
 267                 minfree = 0;
 268         else {
 269                 if (fgets(buf, sizeof(buf), fp) == NULL)
 270                         minfree = 0;
 271                 else
 272                         minfree = atoi(buf);
 273                 (void)fclose(fp);
 274         }
 275
 276         needed = dumpsize / 1024 + 2;   /* 2 for info file */
 277         needed -= saved_dump_size(bounds);
 278         if ((minfree > 0 ? spacefree : totfree) - needed < minfree) {
 279                 syslog(LOG_WARNING,
 280         "no dump, not enough free space on device (%lld available, need %lld)",
 281                     (long long)(minfree > 0 ? spacefree : totfree),
 282                     (long long)needed);
 283                 return (0);
 284         }
 285         if (spacefree - needed < 0)
 286                 syslog(LOG_WARNING,
 287                     "dump performed, but free space threshold crossed");
 288         return (1);
 289 }
 290
 291 #define BLOCKSIZE (1<<12)
 292 #define BLOCKMASK (~(BLOCKSIZE-1))
 293
 294 static int
 295 DoRegularFile(int fd, off_t dumpsize, char *buf, const char *device,
 296     const char *filename, FILE *fp)
 297 {
 298         int he, hs, nr, nw, wl;
 299         off_t dmpcnt, origsize;
 300
 301         dmpcnt = 0;
 302         origsize = dumpsize;
 303         he = 0;
 304         while (dumpsize > 0) {
 305                 wl = BUFFERSIZE;
 306                 if (wl > dumpsize)
 307                         wl = dumpsize;
 308                 nr = read(fd, buf, wl);
 309                 if (nr != wl) {
 310                         if (nr == 0)
 311                                 syslog(LOG_WARNING,
 312                                     "WARNING: EOF on dump device");
 313                         else
 314                                 syslog(LOG_ERR, "read error on %s: %m", device);
 315                         nerr++;
 316                         return (-1);
 317                 }
 318                 if (compress) {
 319                         nw = fwrite(buf, 1, wl, fp);
 320                 } else {
 321                         for (nw = 0; nw < nr; nw = he) {
 322                                 /* find a contiguous block of zeroes */
 323                                 for (hs = nw; hs < nr; hs += BLOCKSIZE) {
 324                                         for (he = hs; he < nr && buf[he] == 0;
 325                                             ++he)
 326                                                 /* nothing */ ;
 327                                         /* is the hole long enough to matter? */
 328                                         if (he >= hs + BLOCKSIZE)
 329                                                 break;
 330                                 }
 331
 332                                 /* back down to a block boundary */
 333                                 he &= BLOCKMASK;
 334
 335                                 /*
 336                                  * 1) Don't go beyond the end of the buffer.
 337                                  * 2) If the end of the buffer is less than
 338                                  *    BLOCKSIZE bytes away, we're at the end
 339                                  *    of the file, so just grab what's left.
 340                                  */
 341                                 if (hs + BLOCKSIZE > nr)
 342                                         hs = he = nr;
 343
 344                                 /*
 345                                  * At this point, we have a partial ordering:
 346                                  *     nw <= hs <= he <= nr
 347                                  * If hs > nw, buf[nw..hs] contains non-zero data.
 348                                  * If he > hs, buf[hs..he] is all zeroes.
 349                                  */
 350                                 if (hs > nw)
 351                                         if (fwrite(buf + nw, hs - nw, 1, fp)
 352                                             != 1)
 353                                         break;
 354                                 if (he > hs)
 355                                         if (fseeko(fp, he - hs, SEEK_CUR) == -1)
 356                                                 break;
 357                         }
 358                 }
 359                 if (nw != wl) {
 360                         syslog(LOG_ERR,
 361                             "write error on %s file: %m", filename);
 362                         syslog(LOG_WARNING,
 363                             "WARNING: vmcore may be incomplete");
 364                         nerr++;
 365                         return (-1);
 366                 }
 367                 if (verbose) {
 368                         dmpcnt += wl;
 369                         printf("%llu\r", (unsigned long long)dmpcnt);
 370                         fflush(stdout);
 371                 }
 372                 dumpsize -= wl;
 373                 if (got_siginfo) {
 374                         printf("%s %.1lf%%\n", filename, (100.0 - (100.0 *
 375                             (double)dumpsize / (double)origsize)));
 376                         got_siginfo = 0;
 377                 }
 378         }
 379         return (0);
 380 }
 381
 382 /*
 383  * Specialized version of dump-reading logic for use with textdumps, which
 384  * are written backwards from the end of the partition, and must be reversed
 385  * before being written to the file.  Textdumps are small, so do a bit less
 386  * work to optimize/sparsify.
 387  */
 388 static int
 389 DoTextdumpFile(int fd, off_t dumpsize, off_t lasthd, char *buf,
 390     const char *device, const char *filename, FILE *fp)
 391 {
 392         int nr, nw, wl;
 393         off_t dmpcnt, totsize;
 394
 395         totsize = dumpsize;
 396         dmpcnt = 0;
 397         wl = 512;
 398         if ((dumpsize % wl) != 0) {
 399                 syslog(LOG_ERR, "textdump uneven multiple of 512 on %s",
 400                     device);
 401                 nerr++;
 402                 return (-1);
 403         }
 404         while (dumpsize > 0) {
 405                 nr = pread(fd, buf, wl, lasthd - (totsize - dumpsize) - wl);
 406                 if (nr != wl) {
 407                         if (nr == 0)
 408                                 syslog(LOG_WARNING,
 409                                     "WARNING: EOF on dump device");
 410                         else
 411                                 syslog(LOG_ERR, "read error on %s: %m", device);
 412                         nerr++;
 413                         return (-1);
 414                 }
 415                 nw = fwrite(buf, 1, wl, fp);
 416                 if (nw != wl) {
 417                         syslog(LOG_ERR,
 418                             "write error on %s file: %m", filename);
 419                         syslog(LOG_WARNING,
 420                             "WARNING: textdump may be incomplete");
 421                         nerr++;
 422                         return (-1);
 423                 }
 424                 if (verbose) {
 425                         dmpcnt += wl;
 426                         printf("%llu\r", (unsigned long long)dmpcnt);
 427                         fflush(stdout);
 428                 }
 429                 dumpsize -= wl;
 430         }
 431         return (0);
 432 }
 433
 434 static void
 435 DoFile(const char *savedir, const char *device)
 436 {
 437         xo_handle_t *xostdout, *xoinfo;
 438         static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX];
 439         static char *buf = NULL, *temp = NULL;
 440         struct kerneldumpheader kdhf, kdhl;
 441         off_t mediasize, dumpsize, firsthd, lasthd;
 442         FILE *info, *fp;
 443         mode_t oumask;
 444         int fd, fdinfo, error;
 445         int bounds, status;
 446         u_int sectorsize, xostyle;
 447         int istextdump;
 448
 449         bounds = getbounds();
 450         mediasize = 0;
 451         status = STATUS_UNKNOWN;
 452
 453         xostdout = xo_create_to_file(stdout, XO_STYLE_TEXT, 0);
 454         if (xostdout == NULL) {
 455                 syslog(LOG_ERR, "%s: %m", infoname);
 456                 return;
 457         }
 458
 459         if (maxdumps > 0 && bounds == maxdumps)
 460                 bounds = 0;
 461
 462         if (buf == NULL) {
 463                 buf = malloc(BUFFERSIZE);
 464                 if (buf == NULL) {
 465                         syslog(LOG_ERR, "%m");
 466                         return;
 467                 }
 468         }
 469
 470         if (verbose)
 471                 printf("checking for kernel dump on device %s\n", device);
 472
 473         fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR);
 474         if (fd < 0) {
 475                 syslog(LOG_ERR, "%s: %m", device);
 476                 return;
 477         }
 478
 479         error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
 480         if (!error)
 481                 error = ioctl(fd, DIOCGSECTORSIZE, &sectorsize);
 482         if (error) {
 483                 syslog(LOG_ERR,
 484                     "couldn't find media and/or sector size of %s: %m", device);
 485                 goto closefd;
 486         }
 487
 488         if (verbose) {
 489                 printf("mediasize = %lld\n", (long long)mediasize);
 490                 printf("sectorsize = %u\n", sectorsize);
 491         }
 492
 493         if (sectorsize < sizeof(kdhl)) {
 494                 syslog(LOG_ERR,
 495                     "Sector size is less the kernel dump header %zu",
 496                     sizeof(kdhl));
 497                 goto closefd;
 498         }
 499
 500         lasthd = mediasize - sectorsize;
 501         if (temp == NULL) {
 502                 temp = malloc(sectorsize);
 503                 if (temp == NULL) {
 504                         syslog(LOG_ERR, "%m");
 505                         goto closefd;
 506                 }
 507         }
 508         if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
 509             read(fd, temp, sectorsize) != (ssize_t)sectorsize) {
 510                 syslog(LOG_ERR,
 511                     "error reading last dump header at offset %lld in %s: %m",
 512                     (long long)lasthd, device);
 513                 goto closefd;
 514         }
 515         memcpy(&kdhl, temp, sizeof(kdhl));
 516         istextdump = 0;
 517         if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) {
 518                 if (verbose)
 519                         printf("textdump magic on last dump header on %s\n",
 520                             device);
 521                 istextdump = 1;
 522                 if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) {
 523                         syslog(LOG_ERR,
 524                             "unknown version (%d) in last dump header on %s",
 525                             dtoh32(kdhl.version), device);
 526
 527                         status = STATUS_BAD;
 528                         if (force == 0)
 529                                 goto closefd;
 530                 }
 531         } else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) ==
 532             0) {
 533                 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 534                         syslog(LOG_ERR,
 535                             "unknown version (%d) in last dump header on %s",
 536                             dtoh32(kdhl.version), device);
 537
 538                         status = STATUS_BAD;
 539                         if (force == 0)
 540                                 goto closefd;
 541                 }
 542         } else {
 543                 if (verbose)
 544                         printf("magic mismatch on last dump header on %s\n",
 545                             device);
 546
 547                 status = STATUS_BAD;
 548                 if (force == 0)
 549                         goto closefd;
 550
 551                 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
 552                             sizeof kdhl.magic) == 0) {
 553                         if (verbose)
 554                                 printf("forcing magic on %s\n", device);
 555                         memcpy(kdhl.magic, KERNELDUMPMAGIC,
 556                             sizeof kdhl.magic);
 557                 } else {
 558                         syslog(LOG_ERR, "unable to force dump - bad magic");
 559                         goto closefd;
 560                 }
 561                 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 562                         syslog(LOG_ERR,
 563                             "unknown version (%d) in last dump header on %s",
 564                             dtoh32(kdhl.version), device);
 565
 566                         status = STATUS_BAD;
 567                         if (force == 0)
 568                                 goto closefd;
 569                 }
 570         }
 571
 572         nfound++;
 573         if (clear)
 574                 goto nuke;
 575
 576         if (kerneldump_parity(&kdhl)) {
 577                 syslog(LOG_ERR,
 578                     "parity error on last dump header on %s", device);
 579                 nerr++;
 580                 status = STATUS_BAD;
 581                 if (force == 0)
 582                         goto closefd;
 583         }
 584         dumpsize = dtoh64(kdhl.dumplength);
 585         firsthd = lasthd - dumpsize - sectorsize;
 586         if (lseek(fd, firsthd, SEEK_SET) != firsthd ||
 587             read(fd, temp, sectorsize) != (ssize_t)sectorsize) {
 588                 syslog(LOG_ERR,
 589                     "error reading first dump header at offset %lld in %s: %m",
 590                     (long long)firsthd, device);
 591                 nerr++;
 592                 goto closefd;
 593         }
 594         memcpy(&kdhf, temp, sizeof(kdhf));
 595
 596         if (verbose >= 2) {
 597                 printf("First dump headers:\n");
 598                 printheader(xostdout, &kdhf, device, bounds, -1);
 599
 600                 printf("\nLast dump headers:\n");
 601                 printheader(xostdout, &kdhl, device, bounds, -1);
 602                 printf("\n");
 603         }
 604
 605         if (memcmp(&kdhl, &kdhf, sizeof(kdhl))) {
 606                 syslog(LOG_ERR,
 607                     "first and last dump headers disagree on %s", device);
 608                 nerr++;
 609                 status = STATUS_BAD;
 610                 if (force == 0)
 611                         goto closefd;
 612         } else {
 613                 status = STATUS_GOOD;
 614         }
 615
 616         if (checkfor) {
 617                 printf("A dump exists on %s\n", device);
 618                 close(fd);
 619                 exit(0);
 620         }
 621
 622         if (kdhl.panicstring[0] != '\0')
 623                 syslog(LOG_ALERT, "reboot after panic: %*s",
 624                     (int)sizeof(kdhl.panicstring), kdhl.panicstring);
 625         else
 626                 syslog(LOG_ALERT, "reboot");
 627
 628         if (verbose)
 629                 printf("Checking for available free space\n");
 630
 631         if (!check_space(savedir, dumpsize, bounds)) {
 632                 nerr++;
 633                 goto closefd;
 634         }
 635
 636         writebounds(bounds + 1);
 637
 638         saved_dump_remove(bounds);
 639
 640         snprintf(infoname, sizeof(infoname), "info.%d", bounds);
 641
 642         /*
 643          * Create or overwrite any existing dump header files.
 644          */
 645         fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 646         if (fdinfo < 0) {
 647                 syslog(LOG_ERR, "%s: %m", infoname);
 648                 nerr++;
 649                 goto closefd;
 650         }
 651
 652         oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
 653         if (compress) {
 654                 snprintf(corename, sizeof(corename), "%s.%d.gz",
 655                     istextdump ? "textdump.tar" : "vmcore", bounds);
 656                 fp = zopen(corename, "w");
 657         } else {
 658                 snprintf(corename, sizeof(corename), "%s.%d",
 659                     istextdump ? "textdump.tar" : "vmcore", bounds);
 660                 fp = fopen(corename, "w");
 661         }
 662         if (fp == NULL) {
 663                 syslog(LOG_ERR, "%s: %m", corename);
 664                 close(fdinfo);
 665                 nerr++;
 666                 goto closefd;
 667         }
 668         (void)umask(oumask);
 669
 670         info = fdopen(fdinfo, "w");
 671
 672         if (info == NULL) {
 673                 syslog(LOG_ERR, "fdopen failed: %m");
 674                 nerr++;
 675                 goto closeall;
 676         }
 677
 678         xostyle = xo_get_style(NULL);
 679         xoinfo = xo_create_to_file(info, xostyle, 0);
 680         if (xoinfo == NULL) {
 681                 syslog(LOG_ERR, "%s: %m", infoname);
 682                 nerr++;
 683                 goto closeall;
 684         }
 685         xo_open_container_h(xoinfo, "crashdump");
 686
 687         if (verbose)
 688                 printheader(xostdout, &kdhl, device, bounds, status);
 689
 690         printheader(xoinfo, &kdhl, device, bounds, status);
 691         xo_close_container_h(xoinfo, "crashdump");
 692         xo_flush_h(xoinfo);
 693         xo_finish_h(xoinfo);
 694         fclose(info);
 695
 696         syslog(LOG_NOTICE, "writing %score to %s/%s",
 697             compress ? "compressed " : "", savedir, corename);
 698
 699         if (istextdump) {
 700                 if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device,
 701                     corename, fp) < 0)
 702                         goto closeall;
 703         } else {
 704                 if (DoRegularFile(fd, dumpsize, buf, device, corename, fp)
 705                     < 0)
 706                         goto closeall;
 707         }
 708         if (verbose)
 709                 printf("\n");
 710
 711         if (fclose(fp) < 0) {
 712                 syslog(LOG_ERR, "error on %s: %m", corename);
 713                 nerr++;
 714                 goto closefd;
 715         }
 716
 717         symlinks_remove();
 718         if (symlink(infoname, "info.last") == -1) {
 719                 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
 720                     savedir, "info.last");
 721         }
 722         if (compress) {
 723                 snprintf(linkname, sizeof(linkname), "%s.last.gz",
 724                     istextdump ? "textdump.tar" : "vmcore");
 725         } else {
 726                 snprintf(linkname, sizeof(linkname), "%s.last",
 727                     istextdump ? "textdump.tar" : "vmcore");
 728         }
 729         if (symlink(corename, linkname) == -1) {
 730                 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
 731                     savedir, linkname);
 732         }
 733
 734         nsaved++;
 735
 736         if (verbose)
 737                 printf("dump saved\n");
 738
 739 nuke:
 740         if (!keep) {
 741                 if (verbose)
 742                         printf("clearing dump header\n");
 743                 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof(kdhl.magic));
 744                 memcpy(temp, &kdhl, sizeof(kdhl));
 745                 if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
 746                     write(fd, temp, sectorsize) != (ssize_t)sectorsize)
 747                         syslog(LOG_ERR,
 748                             "error while clearing the dump header: %m");
 749         }
 750         xo_close_container_h(xostdout, "crashdump");
 751         xo_finish_h(xostdout);
 752         close(fd);
 753         return;
 754
 755 closeall:
 756         fclose(fp);
 757
 758 closefd:
 759         close(fd);
 760 }
 761
 762 static void
 763 usage(void)
 764 {
 765         xo_error("%s\n%s\n%s\n",
 766             "usage: savecore -c [-v] [device ...]",
 767             "       savecore -C [-v] [device ...]",
 768             "       savecore [-fkvz] [-m maxdumps] [directory [device ...]]");
 769         exit(1);
 770 }
 771
 772 int
 773 main(int argc, char **argv)
 774 {
 775         const char *savedir = ".";
 776         struct fstab *fsp;
 777         int i, ch, error;
 778
 779         checkfor = compress = clear = force = keep = verbose = 0;
 780         nfound = nsaved = nerr = 0;
 781
 782         openlog("savecore", LOG_PERROR, LOG_DAEMON);
 783         signal(SIGINFO, infohandler);
 784
 785         argc = xo_parse_args(argc, argv);
 786         if (argc < 0)
 787                 exit(1);
 788
 789         while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1)
 790                 switch(ch) {
 791                 case 'C':
 792                         checkfor = 1;
 793                         break;
 794                 case 'c':
 795                         clear = 1;
 796                         break;
 797                 case 'f':
 798                         force = 1;
 799                         break;
 800                 case 'k':
 801                         keep = 1;
 802                         break;
 803                 case 'm':
 804                         maxdumps = atoi(optarg);
 805                         if (maxdumps <= 0) {
 806                                 syslog(LOG_ERR, "Invalid maxdump value");
 807                                 exit(1);
 808                         }
 809                         break;
 810                 case 'v':
 811                         verbose++;
 812                         break;
 813                 case 'z':
 814                         compress = 1;
 815                         break;
 816                 case '?':
 817                 default:
 818                         usage();
 819                 }
 820         if (checkfor && (clear || force || keep))
 821                 usage();
 822         if (clear && (compress || keep))
 823                 usage();
 824         if (maxdumps > 0 && (checkfor || clear))
 825                 usage();
 826         argc -= optind;
 827         argv += optind;
 828         if (argc >= 1 && !checkfor && !clear) {
 829                 error = chdir(argv[0]);
 830                 if (error) {
 831                         syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
 832                         exit(1);
 833                 }
 834                 savedir = argv[0];
 835                 argc--;
 836                 argv++;
 837         }
 838         if (argc == 0) {
 839                 for (;;) {
 840                         fsp = getfsent();
 841                         if (fsp == NULL)
 842                                 break;
 843                         if (strcmp(fsp->fs_vfstype, "swap") &&
 844                             strcmp(fsp->fs_vfstype, "dump"))
 845                                 continue;
 846                         DoFile(savedir, fsp->fs_spec);
 847                 }
 848                 endfsent();
 849         } else {
 850                 for (i = 0; i < argc; i++)
 851                         DoFile(savedir, argv[i]);
 852         }
 853
 854         /* Emit minimal output. */
 855         if (nfound == 0) {
 856                 if (checkfor) {
 857                         if (verbose)
 858                                 printf("No dump exists\n");
 859                         exit(1);
 860                 }
 861                 if (verbose)
 862                         syslog(LOG_WARNING, "no dumps found");
 863         } else if (nsaved == 0) {
 864                 if (nerr != 0) {
 865                         if (verbose)
 866                                 syslog(LOG_WARNING, "unsaved dumps found but not saved");
 867                         exit(1);
 868                 } else if (verbose)
 869                         syslog(LOG_WARNING, "no unsaved dumps found");
 870         }
 871
 872         return (0);
 873 }
 874
 875 static void
 876 infohandler(int sig __unused)
 877 {
 878         got_siginfo = 1;
 879 }