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;
 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         lasthd = mediasize - sectorsize;
 494         if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
 495             read(fd, &kdhl, sizeof(kdhl)) != sizeof(kdhl)) {
 496                 syslog(LOG_ERR,
 497                     "error reading last dump header at offset %lld in %s: %m",
 498                     (long long)lasthd, device);
 499                 goto closefd;
 500         }
 501         istextdump = 0;
 502         if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) {
 503                 if (verbose)
 504                         printf("textdump magic on last dump header on %s\n",
 505                             device);
 506                 istextdump = 1;
 507                 if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) {
 508                         syslog(LOG_ERR,
 509                             "unknown version (%d) in last dump header on %s",
 510                             dtoh32(kdhl.version), device);
 511
 512                         status = STATUS_BAD;
 513                         if (force == 0)
 514                                 goto closefd;
 515                 }
 516         } else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) ==
 517             0) {
 518                 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 519                         syslog(LOG_ERR,
 520                             "unknown version (%d) in last dump header on %s",
 521                             dtoh32(kdhl.version), device);
 522
 523                         status = STATUS_BAD;
 524                         if (force == 0)
 525                                 goto closefd;
 526                 }
 527         } else {
 528                 if (verbose)
 529                         printf("magic mismatch on last dump header on %s\n",
 530                             device);
 531
 532                 status = STATUS_BAD;
 533                 if (force == 0)
 534                         goto closefd;
 535
 536                 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
 537                             sizeof kdhl.magic) == 0) {
 538                         if (verbose)
 539                                 printf("forcing magic on %s\n", device);
 540                         memcpy(kdhl.magic, KERNELDUMPMAGIC,
 541                             sizeof kdhl.magic);
 542                 } else {
 543                         syslog(LOG_ERR, "unable to force dump - bad magic");
 544                         goto closefd;
 545                 }
 546                 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 547                         syslog(LOG_ERR,
 548                             "unknown version (%d) in last dump header on %s",
 549                             dtoh32(kdhl.version), device);
 550
 551                         status = STATUS_BAD;
 552                         if (force == 0)
 553                                 goto closefd;
 554                 }
 555         }
 556
 557         nfound++;
 558         if (clear)
 559                 goto nuke;
 560
 561         if (kerneldump_parity(&kdhl)) {
 562                 syslog(LOG_ERR,
 563                     "parity error on last dump header on %s", device);
 564                 nerr++;
 565                 status = STATUS_BAD;
 566                 if (force == 0)
 567                         goto closefd;
 568         }
 569         dumpsize = dtoh64(kdhl.dumplength);
 570         firsthd = lasthd - dumpsize - sizeof kdhf;
 571         if (lseek(fd, firsthd, SEEK_SET) != firsthd ||
 572             read(fd, &kdhf, sizeof(kdhf)) != sizeof(kdhf)) {
 573                 syslog(LOG_ERR,
 574                     "error reading first dump header at offset %lld in %s: %m",
 575                     (long long)firsthd, device);
 576                 nerr++;
 577                 goto closefd;
 578         }
 579
 580         if (verbose >= 2) {
 581                 printf("First dump headers:\n");
 582                 printheader(xostdout, &kdhf, device, bounds, -1);
 583
 584                 printf("\nLast dump headers:\n");
 585                 printheader(xostdout, &kdhl, device, bounds, -1);
 586                 printf("\n");
 587         }
 588
 589         if (memcmp(&kdhl, &kdhf, sizeof kdhl)) {
 590                 syslog(LOG_ERR,
 591                     "first and last dump headers disagree on %s", device);
 592                 nerr++;
 593                 status = STATUS_BAD;
 594                 if (force == 0)
 595                         goto closefd;
 596         } else {
 597                 status = STATUS_GOOD;
 598         }
 599
 600         if (checkfor) {
 601                 printf("A dump exists on %s\n", device);
 602                 close(fd);
 603                 exit(0);
 604         }
 605
 606         if (kdhl.panicstring[0])
 607                 syslog(LOG_ALERT, "reboot after panic: %*s",
 608                     (int)sizeof(kdhl.panicstring), kdhl.panicstring);
 609         else
 610                 syslog(LOG_ALERT, "reboot");
 611
 612         if (verbose)
 613                 printf("Checking for available free space\n");
 614
 615         if (!check_space(savedir, dumpsize, bounds)) {
 616                 nerr++;
 617                 goto closefd;
 618         }
 619
 620         writebounds(bounds + 1);
 621
 622         saved_dump_remove(bounds);
 623
 624         snprintf(infoname, sizeof(infoname), "info.%d", bounds);
 625
 626         /*
 627          * Create or overwrite any existing dump header files.
 628          */
 629         fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 630         if (fdinfo < 0) {
 631                 syslog(LOG_ERR, "%s: %m", infoname);
 632                 nerr++;
 633                 goto closefd;
 634         }
 635
 636         oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
 637         if (compress) {
 638                 snprintf(corename, sizeof(corename), "%s.%d.gz",
 639                     istextdump ? "textdump.tar" : "vmcore", bounds);
 640                 fp = zopen(corename, "w");
 641         } else {
 642                 snprintf(corename, sizeof(corename), "%s.%d",
 643                     istextdump ? "textdump.tar" : "vmcore", bounds);
 644                 fp = fopen(corename, "w");
 645         }
 646         if (fp == NULL) {
 647                 syslog(LOG_ERR, "%s: %m", corename);
 648                 close(fdinfo);
 649                 nerr++;
 650                 goto closefd;
 651         }
 652         (void)umask(oumask);
 653
 654         info = fdopen(fdinfo, "w");
 655
 656         if (info == NULL) {
 657                 syslog(LOG_ERR, "fdopen failed: %m");
 658                 nerr++;
 659                 goto closeall;
 660         }
 661
 662         xostyle = xo_get_style(NULL);
 663         xoinfo = xo_create_to_file(info, xostyle, 0);
 664         if (xoinfo == NULL) {
 665                 syslog(LOG_ERR, "%s: %m", infoname);
 666                 nerr++;
 667                 goto closeall;
 668         }
 669         xo_open_container_h(xoinfo, "crashdump");
 670
 671         if (verbose)
 672                 printheader(xostdout, &kdhl, device, bounds, status);
 673
 674         printheader(xoinfo, &kdhl, device, bounds, status);
 675         xo_close_container_h(xoinfo, "crashdump");
 676         xo_flush_h(xoinfo);
 677         xo_finish_h(xoinfo);
 678         fclose(info);
 679
 680         syslog(LOG_NOTICE, "writing %score to %s/%s",
 681             compress ? "compressed " : "", savedir, corename);
 682
 683         if (istextdump) {
 684                 if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device,
 685                     corename, fp) < 0)
 686                         goto closeall;
 687         } else {
 688                 if (DoRegularFile(fd, dumpsize, buf, device, corename, fp)
 689                     < 0)
 690                         goto closeall;
 691         }
 692         if (verbose)
 693                 printf("\n");
 694
 695         if (fclose(fp) < 0) {
 696                 syslog(LOG_ERR, "error on %s: %m", corename);
 697                 nerr++;
 698                 goto closefd;
 699         }
 700
 701         symlinks_remove();
 702         if (symlink(infoname, "info.last") == -1) {
 703                 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
 704                     savedir, "info.last");
 705         }
 706         if (compress) {
 707                 snprintf(linkname, sizeof(linkname), "%s.last.gz",
 708                     istextdump ? "textdump.tar" : "vmcore");
 709         } else {
 710                 snprintf(linkname, sizeof(linkname), "%s.last",
 711                     istextdump ? "textdump.tar" : "vmcore");
 712         }
 713         if (symlink(corename, linkname) == -1) {
 714                 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
 715                     savedir, linkname);
 716         }
 717
 718         nsaved++;
 719
 720         if (verbose)
 721                 printf("dump saved\n");
 722
 723 nuke:
 724         if (!keep) {
 725                 if (verbose)
 726                         printf("clearing dump header\n");
 727                 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic);
 728                 if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
 729                     write(fd, &kdhl, sizeof(kdhl)) != sizeof(kdhl))
 730                         syslog(LOG_ERR,
 731                             "error while clearing the dump header: %m");
 732         }
 733         xo_close_container_h(xostdout, "crashdump");
 734         xo_finish_h(xostdout);
 735         close(fd);
 736         return;
 737
 738 closeall:
 739         fclose(fp);
 740
 741 closefd:
 742         close(fd);
 743 }
 744
 745 static void
 746 usage(void)
 747 {
 748         xo_error("%s\n%s\n%s\n",
 749             "usage: savecore -c [-v] [device ...]",
 750             "       savecore -C [-v] [device ...]",
 751             "       savecore [-fkvz] [-m maxdumps] [directory [device ...]]");
 752         exit(1);
 753 }
 754
 755 int
 756 main(int argc, char **argv)
 757 {
 758         const char *savedir = ".";
 759         struct fstab *fsp;
 760         int i, ch, error;
 761
 762         checkfor = compress = clear = force = keep = verbose = 0;
 763         nfound = nsaved = nerr = 0;
 764
 765         openlog("savecore", LOG_PERROR, LOG_DAEMON);
 766         signal(SIGINFO, infohandler);
 767
 768         argc = xo_parse_args(argc, argv);
 769         if (argc < 0)
 770                 exit(1);
 771
 772         while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1)
 773                 switch(ch) {
 774                 case 'C':
 775                         checkfor = 1;
 776                         break;
 777                 case 'c':
 778                         clear = 1;
 779                         break;
 780                 case 'f':
 781                         force = 1;
 782                         break;
 783                 case 'k':
 784                         keep = 1;
 785                         break;
 786                 case 'm':
 787                         maxdumps = atoi(optarg);
 788                         if (maxdumps <= 0) {
 789                                 syslog(LOG_ERR, "Invalid maxdump value");
 790                                 exit(1);
 791                         }
 792                         break;
 793                 case 'v':
 794                         verbose++;
 795                         break;
 796                 case 'z':
 797                         compress = 1;
 798                         break;
 799                 case '?':
 800                 default:
 801                         usage();
 802                 }
 803         if (checkfor && (clear || force || keep))
 804                 usage();
 805         if (clear && (compress || keep))
 806                 usage();
 807         if (maxdumps > 0 && (checkfor || clear))
 808                 usage();
 809         argc -= optind;
 810         argv += optind;
 811         if (argc >= 1 && !checkfor && !clear) {
 812                 error = chdir(argv[0]);
 813                 if (error) {
 814                         syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
 815                         exit(1);
 816                 }
 817                 savedir = argv[0];
 818                 argc--;
 819                 argv++;
 820         }
 821         if (argc == 0) {
 822                 for (;;) {
 823                         fsp = getfsent();
 824                         if (fsp == NULL)
 825                                 break;
 826                         if (strcmp(fsp->fs_vfstype, "swap") &&
 827                             strcmp(fsp->fs_vfstype, "dump"))
 828                                 continue;
 829                         DoFile(savedir, fsp->fs_spec);
 830                 }
 831         } else {
 832                 for (i = 0; i < argc; i++)
 833                         DoFile(savedir, argv[i]);
 834         }
 835
 836         /* Emit minimal output. */
 837         if (nfound == 0) {
 838                 if (checkfor) {
 839                         if (verbose)
 840                                 printf("No dump exists\n");
 841                         exit(1);
 842                 }
 843                 if (verbose)
 844                         syslog(LOG_WARNING, "no dumps found");
 845         } else if (nsaved == 0) {
 846                 if (nerr != 0) {
 847                         if (verbose)
 848                                 syslog(LOG_WARNING, "unsaved dumps found but not saved");
 849                         exit(1);
 850                 } else if (verbose)
 851                         syslog(LOG_WARNING, "no unsaved dumps found");
 852         }
 853
 854         return (0);
 855 }
 856
 857 static void
 858 infohandler(int sig __unused)
 859 {
 860         got_siginfo = 1;
 861 }