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 <ctype.h>
  72 #include <errno.h>
  73 #include <fcntl.h>
  74 #include <fstab.h>
  75 #include <paths.h>
  76 #include <signal.h>
  77 #include <stdarg.h>
  78 #include <stdbool.h>
  79 #include <stdio.h>
  80 #include <stdlib.h>
  81 #include <string.h>
  82 #include <syslog.h>
  83 #include <time.h>
  84 #include <unistd.h>
  85 #include <libxo/xo.h>
  86
  87 /* The size of the buffer used for I/O. */
  88 #define BUFFERSIZE      (1024*1024)
  89
  90 #define STATUS_BAD      0
  91 #define STATUS_GOOD     1
  92 #define STATUS_UNKNOWN  2
  93
  94 static int checkfor, compress, clear, force, keep, verbose;     /* flags */
  95 static int nfound, nsaved, nerr;                        /* statistics */
  96 static int maxdumps;
  97
  98 extern FILE *zopen(const char *, const char *);
  99
 100 static sig_atomic_t got_siginfo;
 101 static void infohandler(int);
 102
 103 static void
 104 printheader(xo_handle_t *xo, const struct kerneldumpheader *h, const char *device,
 105     int bounds, const int status)
 106 {
 107         uint64_t dumplen;
 108         time_t t;
 109         const char *stat_str;
 110
 111         xo_flush_h(xo);
 112         xo_emit_h(xo, "{Lwc:Dump header from device}{:dump_device/%s}\n", device);
 113         xo_emit_h(xo, "{P:  }{Lwc:Architecture}{:architecture/%s}\n", h->architecture);
 114         xo_emit_h(xo, "{P:  }{Lwc:Architecture Version}{:architecture_version/%u}\n", dtoh32(h->architectureversion));
 115         dumplen = dtoh64(h->dumplength);
 116         xo_emit_h(xo, "{P:  }{Lwc:Dump Length}{:dump_length_bytes/%lld}\n", (long long)dumplen);
 117         xo_emit_h(xo, "{P:  }{Lwc:Blocksize}{:blocksize/%d}\n", dtoh32(h->blocksize));
 118         t = dtoh64(h->dumptime);
 119         xo_emit_h(xo, "{P:  }{Lwc:Dumptime}{:dumptime/%s}", ctime(&t));
 120         xo_emit_h(xo, "{P:  }{Lwc:Hostname}{:hostname/%s}\n", h->hostname);
 121         xo_emit_h(xo, "{P:  }{Lwc:Magic}{:magic/%s}\n", h->magic);
 122         xo_emit_h(xo, "{P:  }{Lwc:Version String}{:version_string/%s}", h->versionstring);
 123         xo_emit_h(xo, "{P:  }{Lwc:Panic String}{:panic_string/%s}\n", h->panicstring);
 124         xo_emit_h(xo, "{P:  }{Lwc:Dump Parity}{:dump_parity/%u}\n", h->parity);
 125         xo_emit_h(xo, "{P:  }{Lwc:Bounds}{:bounds/%d}\n", bounds);
 126
 127         switch(status) {
 128         case STATUS_BAD:
 129                 stat_str = "bad";
 130                 break;
 131         case STATUS_GOOD:
 132                 stat_str = "good";
 133                 break;
 134         default:
 135                 stat_str = "unknown";
 136         }
 137         xo_emit_h(xo, "{P:  }{Lwc:Dump Status}{:dump_status/%s}\n", stat_str);
 138         xo_flush_h(xo);
 139 }
 140
 141 static int
 142 getbounds(void) {
 143         FILE *fp;
 144         char buf[6];
 145         int ret;
 146
 147         ret = 0;
 148
 149         if ((fp = fopen("bounds", "r")) == NULL) {
 150                 if (verbose)
 151                         printf("unable to open bounds file, using 0\n");
 152                 return (ret);
 153         }
 154
 155         if (fgets(buf, sizeof buf, fp) == NULL) {
 156                 if (feof(fp))
 157                         syslog(LOG_WARNING, "bounds file is empty, using 0");
 158                 else
 159                         syslog(LOG_WARNING, "bounds file: %s", strerror(errno));
 160                 fclose(fp);
 161                 return (ret);
 162         }
 163
 164         errno = 0;
 165         ret = (int)strtol(buf, NULL, 10);
 166         if (ret == 0 && (errno == EINVAL || errno == ERANGE))
 167                 syslog(LOG_WARNING, "invalid value found in bounds, using 0");
 168         fclose(fp);
 169         return (ret);
 170 }
 171
 172 static void
 173 writebounds(int bounds) {
 174         FILE *fp;
 175
 176         if ((fp = fopen("bounds", "w")) == NULL) {
 177                 syslog(LOG_WARNING, "unable to write to bounds file: %m");
 178                 return;
 179         }
 180
 181         if (verbose)
 182                 printf("bounds number: %d\n", bounds);
 183
 184         fprintf(fp, "%d\n", bounds);
 185         fclose(fp);
 186 }
 187
 188 static off_t
 189 file_size(const char *path)
 190 {
 191         struct stat sb;
 192
 193         /* Ignore all errors, those file may not exists. */
 194         if (stat(path, &sb) == -1)
 195                 return (0);
 196         return (sb.st_size);
 197 }
 198
 199 static off_t
 200 saved_dump_size(int bounds)
 201 {
 202         static char path[PATH_MAX];
 203         off_t dumpsize;
 204
 205         dumpsize = 0;
 206
 207         (void)snprintf(path, sizeof(path), "info.%d", bounds);
 208         dumpsize += file_size(path);
 209         (void)snprintf(path, sizeof(path), "vmcore.%d", bounds);
 210         dumpsize += file_size(path);
 211         (void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds);
 212         dumpsize += file_size(path);
 213         (void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds);
 214         dumpsize += file_size(path);
 215         (void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds);
 216         dumpsize += file_size(path);
 217
 218         return (dumpsize);
 219 }
 220
 221 static void
 222 saved_dump_remove(int bounds)
 223 {
 224         static char path[PATH_MAX];
 225
 226         (void)snprintf(path, sizeof(path), "info.%d", bounds);
 227         (void)unlink(path);
 228         (void)snprintf(path, sizeof(path), "vmcore.%d", bounds);
 229         (void)unlink(path);
 230         (void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds);
 231         (void)unlink(path);
 232         (void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds);
 233         (void)unlink(path);
 234         (void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds);
 235         (void)unlink(path);
 236 }
 237
 238 static void
 239 symlinks_remove(void)
 240 {
 241
 242         (void)unlink("info.last");
 243         (void)unlink("vmcore.last");
 244         (void)unlink("vmcore.last.gz");
 245         (void)unlink("textdump.tar.last");
 246         (void)unlink("textdump.tar.last.gz");
 247 }
 248
 249 /*
 250  * Check that sufficient space is available on the disk that holds the
 251  * save directory.
 252  */
 253 static int
 254 check_space(const char *savedir, off_t dumpsize, int bounds)
 255 {
 256         FILE *fp;
 257         off_t available, minfree, spacefree, totfree, needed;
 258         struct statfs fsbuf;
 259         char buf[100];
 260
 261         if (statfs(".", &fsbuf) < 0) {
 262                 syslog(LOG_ERR, "%s: %m", savedir);
 263                 exit(1);
 264         }
 265         spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
 266         totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;
 267
 268         if ((fp = fopen("minfree", "r")) == NULL)
 269                 minfree = 0;
 270         else {
 271                 if (fgets(buf, sizeof(buf), fp) == NULL)
 272                         minfree = 0;
 273                 else {
 274                         char *endp;
 275
 276                         errno = 0;
 277                         minfree = strtoll(buf, &endp, 10);
 278                         if (minfree == 0 && errno != 0)
 279                                 minfree = -1;
 280                         else {
 281                                 while (*endp != '\0' && isspace(*endp))
 282                                         endp++;
 283                                 if (*endp != '\0' || minfree < 0)
 284                                         minfree = -1;
 285                         }
 286                         if (minfree < 0)
 287                                 syslog(LOG_WARNING,
 288                                     "`minfree` didn't contain a valid size "
 289                                     "(`%s`). Defaulting to 0", buf);
 290                 }
 291                 (void)fclose(fp);
 292         }
 293
 294         available = minfree > 0 ? spacefree - minfree : totfree;
 295         needed = dumpsize / 1024 + 2;   /* 2 for info file */
 296         needed -= saved_dump_size(bounds);
 297         if (available < needed) {
 298                 syslog(LOG_WARNING,
 299                     "no dump: not enough free space on device (need at least "
 300                     "%jdkB for dump; %jdkB available; %jdkB reserved)",
 301                     (intmax_t)needed,
 302                     (intmax_t)available + minfree,
 303                     (intmax_t)minfree);
 304                 return (0);
 305         }
 306         if (spacefree - needed < 0)
 307                 syslog(LOG_WARNING,
 308                     "dump performed, but free space threshold crossed");
 309         return (1);
 310 }
 311
 312 static bool
 313 compare_magic(const struct kerneldumpheader *kdh, const char *magic)
 314 {
 315
 316         return (strncmp(kdh->magic, magic, sizeof(kdh->magic)) == 0);
 317 }
 318
 319 #define BLOCKSIZE (1<<12)
 320 #define BLOCKMASK (~(BLOCKSIZE-1))
 321
 322 static int
 323 DoRegularFile(int fd, off_t dumpsize, char *buf, const char *device,
 324     const char *filename, FILE *fp)
 325 {
 326         int he, hs, nr, nw, wl;
 327         off_t dmpcnt, origsize;
 328
 329         dmpcnt = 0;
 330         origsize = dumpsize;
 331         he = 0;
 332         while (dumpsize > 0) {
 333                 wl = BUFFERSIZE;
 334                 if (wl > dumpsize)
 335                         wl = dumpsize;
 336                 nr = read(fd, buf, wl);
 337                 if (nr != wl) {
 338                         if (nr == 0)
 339                                 syslog(LOG_WARNING,
 340                                     "WARNING: EOF on dump device");
 341                         else
 342                                 syslog(LOG_ERR, "read error on %s: %m", device);
 343                         nerr++;
 344                         return (-1);
 345                 }
 346                 if (compress) {
 347                         nw = fwrite(buf, 1, wl, fp);
 348                 } else {
 349                         for (nw = 0; nw < nr; nw = he) {
 350                                 /* find a contiguous block of zeroes */
 351                                 for (hs = nw; hs < nr; hs += BLOCKSIZE) {
 352                                         for (he = hs; he < nr && buf[he] == 0;
 353                                             ++he)
 354                                                 /* nothing */ ;
 355                                         /* is the hole long enough to matter? */
 356                                         if (he >= hs + BLOCKSIZE)
 357                                                 break;
 358                                 }
 359
 360                                 /* back down to a block boundary */
 361                                 he &= BLOCKMASK;
 362
 363                                 /*
 364                                  * 1) Don't go beyond the end of the buffer.
 365                                  * 2) If the end of the buffer is less than
 366                                  *    BLOCKSIZE bytes away, we're at the end
 367                                  *    of the file, so just grab what's left.
 368                                  */
 369                                 if (hs + BLOCKSIZE > nr)
 370                                         hs = he = nr;
 371
 372                                 /*
 373                                  * At this point, we have a partial ordering:
 374                                  *     nw <= hs <= he <= nr
 375                                  * If hs > nw, buf[nw..hs] contains non-zero data.
 376                                  * If he > hs, buf[hs..he] is all zeroes.
 377                                  */
 378                                 if (hs > nw)
 379                                         if (fwrite(buf + nw, hs - nw, 1, fp)
 380                                             != 1)
 381                                         break;
 382                                 if (he > hs)
 383                                         if (fseeko(fp, he - hs, SEEK_CUR) == -1)
 384                                                 break;
 385                         }
 386                 }
 387                 if (nw != wl) {
 388                         syslog(LOG_ERR,
 389                             "write error on %s file: %m", filename);
 390                         syslog(LOG_WARNING,
 391                             "WARNING: vmcore may be incomplete");
 392                         nerr++;
 393                         return (-1);
 394                 }
 395                 if (verbose) {
 396                         dmpcnt += wl;
 397                         printf("%llu\r", (unsigned long long)dmpcnt);
 398                         fflush(stdout);
 399                 }
 400                 dumpsize -= wl;
 401                 if (got_siginfo) {
 402                         printf("%s %.1lf%%\n", filename, (100.0 - (100.0 *
 403                             (double)dumpsize / (double)origsize)));
 404                         got_siginfo = 0;
 405                 }
 406         }
 407         return (0);
 408 }
 409
 410 /*
 411  * Specialized version of dump-reading logic for use with textdumps, which
 412  * are written backwards from the end of the partition, and must be reversed
 413  * before being written to the file.  Textdumps are small, so do a bit less
 414  * work to optimize/sparsify.
 415  */
 416 static int
 417 DoTextdumpFile(int fd, off_t dumpsize, off_t lasthd, char *buf,
 418     const char *device, const char *filename, FILE *fp)
 419 {
 420         int nr, nw, wl;
 421         off_t dmpcnt, totsize;
 422
 423         totsize = dumpsize;
 424         dmpcnt = 0;
 425         wl = 512;
 426         if ((dumpsize % wl) != 0) {
 427                 syslog(LOG_ERR, "textdump uneven multiple of 512 on %s",
 428                     device);
 429                 nerr++;
 430                 return (-1);
 431         }
 432         while (dumpsize > 0) {
 433                 nr = pread(fd, buf, wl, lasthd - (totsize - dumpsize) - wl);
 434                 if (nr != wl) {
 435                         if (nr == 0)
 436                                 syslog(LOG_WARNING,
 437                                     "WARNING: EOF on dump device");
 438                         else
 439                                 syslog(LOG_ERR, "read error on %s: %m", device);
 440                         nerr++;
 441                         return (-1);
 442                 }
 443                 nw = fwrite(buf, 1, wl, fp);
 444                 if (nw != wl) {
 445                         syslog(LOG_ERR,
 446                             "write error on %s file: %m", filename);
 447                         syslog(LOG_WARNING,
 448                             "WARNING: textdump may be incomplete");
 449                         nerr++;
 450                         return (-1);
 451                 }
 452                 if (verbose) {
 453                         dmpcnt += wl;
 454                         printf("%llu\r", (unsigned long long)dmpcnt);
 455                         fflush(stdout);
 456                 }
 457                 dumpsize -= wl;
 458         }
 459         return (0);
 460 }
 461
 462 static void
 463 DoFile(const char *savedir, const char *device)
 464 {
 465         xo_handle_t *xostdout, *xoinfo;
 466         static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX];
 467         static char *buf = NULL, *temp = NULL;
 468         struct kerneldumpheader kdhf, kdhl;
 469         off_t mediasize, dumpsize, firsthd, lasthd;
 470         FILE *info, *fp;
 471         mode_t oumask;
 472         int fd, fdinfo, error;
 473         int bounds, status;
 474         u_int sectorsize, xostyle;
 475         int istextdump;
 476
 477         bounds = getbounds();
 478         mediasize = 0;
 479         status = STATUS_UNKNOWN;
 480
 481         xostdout = xo_create_to_file(stdout, XO_STYLE_TEXT, 0);
 482         if (xostdout == NULL) {
 483                 syslog(LOG_ERR, "%s: %m", infoname);
 484                 return;
 485         }
 486
 487         if (maxdumps > 0 && bounds == maxdumps)
 488                 bounds = 0;
 489
 490         if (buf == NULL) {
 491                 buf = malloc(BUFFERSIZE);
 492                 if (buf == NULL) {
 493                         syslog(LOG_ERR, "%m");
 494                         return;
 495                 }
 496         }
 497
 498         if (verbose)
 499                 printf("checking for kernel dump on device %s\n", device);
 500
 501         fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR);
 502         if (fd < 0) {
 503                 syslog(LOG_ERR, "%s: %m", device);
 504                 return;
 505         }
 506
 507         error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
 508         if (!error)
 509                 error = ioctl(fd, DIOCGSECTORSIZE, &sectorsize);
 510         if (error) {
 511                 syslog(LOG_ERR,
 512                     "couldn't find media and/or sector size of %s: %m", device);
 513                 goto closefd;
 514         }
 515
 516         if (verbose) {
 517                 printf("mediasize = %lld bytes\n", (long long)mediasize);
 518                 printf("sectorsize = %u bytes\n", sectorsize);
 519         }
 520
 521         if (sectorsize < sizeof(kdhl)) {
 522                 syslog(LOG_ERR,
 523                     "Sector size is less the kernel dump header %zu",
 524                     sizeof(kdhl));
 525                 goto closefd;
 526         }
 527
 528         lasthd = mediasize - sectorsize;
 529         if (temp == NULL) {
 530                 temp = malloc(sectorsize);
 531                 if (temp == NULL) {
 532                         syslog(LOG_ERR, "%m");
 533                         goto closefd;
 534                 }
 535         }
 536         if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
 537             read(fd, temp, sectorsize) != (ssize_t)sectorsize) {
 538                 syslog(LOG_ERR,
 539                     "error reading last dump header at offset %lld in %s: %m",
 540                     (long long)lasthd, device);
 541                 goto closefd;
 542         }
 543         memcpy(&kdhl, temp, sizeof(kdhl));
 544         istextdump = 0;
 545         if (compare_magic(&kdhl, TEXTDUMPMAGIC)) {
 546                 if (verbose)
 547                         printf("textdump magic on last dump header on %s\n",
 548                             device);
 549                 istextdump = 1;
 550                 if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) {
 551                         syslog(LOG_ERR,
 552                             "unknown version (%d) in last dump header on %s",
 553                             dtoh32(kdhl.version), device);
 554
 555                         status = STATUS_BAD;
 556                         if (force == 0)
 557                                 goto closefd;
 558                 }
 559         } else if (compare_magic(&kdhl, KERNELDUMPMAGIC)) {
 560                 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 561                         syslog(LOG_ERR,
 562                             "unknown version (%d) in last dump header on %s",
 563                             dtoh32(kdhl.version), device);
 564
 565                         status = STATUS_BAD;
 566                         if (force == 0)
 567                                 goto closefd;
 568                 }
 569         } else {
 570                 if (verbose)
 571                         printf("magic mismatch on last dump header on %s\n",
 572                             device);
 573
 574                 status = STATUS_BAD;
 575                 if (force == 0)
 576                         goto closefd;
 577
 578                 if (compare_magic(&kdhl, KERNELDUMPMAGIC_CLEARED)) {
 579                         if (verbose)
 580                                 printf("forcing magic on %s\n", device);
 581                         memcpy(kdhl.magic, KERNELDUMPMAGIC,
 582                             sizeof kdhl.magic);
 583                 } else {
 584                         syslog(LOG_ERR, "unable to force dump - bad magic");
 585                         goto closefd;
 586                 }
 587                 if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 588                         syslog(LOG_ERR,
 589                             "unknown version (%d) in last dump header on %s",
 590                             dtoh32(kdhl.version), device);
 591
 592                         status = STATUS_BAD;
 593                         if (force == 0)
 594                                 goto closefd;
 595                 }
 596         }
 597
 598         nfound++;
 599         if (clear)
 600                 goto nuke;
 601
 602         if (kerneldump_parity(&kdhl)) {
 603                 syslog(LOG_ERR,
 604                     "parity error on last dump header on %s", device);
 605                 nerr++;
 606                 status = STATUS_BAD;
 607                 if (force == 0)
 608                         goto closefd;
 609         }
 610         dumpsize = dtoh64(kdhl.dumplength);
 611         firsthd = lasthd - dumpsize - sectorsize;
 612         if (lseek(fd, firsthd, SEEK_SET) != firsthd ||
 613             read(fd, temp, sectorsize) != (ssize_t)sectorsize) {
 614                 syslog(LOG_ERR,
 615                     "error reading first dump header at offset %lld in %s: %m",
 616                     (long long)firsthd, device);
 617                 nerr++;
 618                 goto closefd;
 619         }
 620         memcpy(&kdhf, temp, sizeof(kdhf));
 621
 622         if (verbose >= 2) {
 623                 printf("First dump headers:\n");
 624                 printheader(xostdout, &kdhf, device, bounds, -1);
 625
 626                 printf("\nLast dump headers:\n");
 627                 printheader(xostdout, &kdhl, device, bounds, -1);
 628                 printf("\n");
 629         }
 630
 631         if (memcmp(&kdhl, &kdhf, sizeof(kdhl))) {
 632                 syslog(LOG_ERR,
 633                     "first and last dump headers disagree on %s", device);
 634                 nerr++;
 635                 status = STATUS_BAD;
 636                 if (force == 0)
 637                         goto closefd;
 638         } else {
 639                 status = STATUS_GOOD;
 640         }
 641
 642         if (checkfor) {
 643                 printf("A dump exists on %s\n", device);
 644                 close(fd);
 645                 exit(0);
 646         }
 647
 648         if (kdhl.panicstring[0] != '\0')
 649                 syslog(LOG_ALERT, "reboot after panic: %.*s",
 650                     (int)sizeof(kdhl.panicstring), kdhl.panicstring);
 651         else
 652                 syslog(LOG_ALERT, "reboot");
 653
 654         if (verbose)
 655                 printf("Checking for available free space\n");
 656
 657         if (!check_space(savedir, dumpsize, bounds)) {
 658                 nerr++;
 659                 goto closefd;
 660         }
 661
 662         writebounds(bounds + 1);
 663
 664         saved_dump_remove(bounds);
 665
 666         snprintf(infoname, sizeof(infoname), "info.%d", bounds);
 667
 668         /*
 669          * Create or overwrite any existing dump header files.
 670          */
 671         fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 672         if (fdinfo < 0) {
 673                 syslog(LOG_ERR, "%s: %m", infoname);
 674                 nerr++;
 675                 goto closefd;
 676         }
 677
 678         oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
 679         if (compress) {
 680                 snprintf(corename, sizeof(corename), "%s.%d.gz",
 681                     istextdump ? "textdump.tar" : "vmcore", bounds);
 682                 fp = zopen(corename, "w");
 683         } else {
 684                 snprintf(corename, sizeof(corename), "%s.%d",
 685                     istextdump ? "textdump.tar" : "vmcore", bounds);
 686                 fp = fopen(corename, "w");
 687         }
 688         if (fp == NULL) {
 689                 syslog(LOG_ERR, "%s: %m", corename);
 690                 close(fdinfo);
 691                 nerr++;
 692                 goto closefd;
 693         }
 694         (void)umask(oumask);
 695
 696         info = fdopen(fdinfo, "w");
 697
 698         if (info == NULL) {
 699                 syslog(LOG_ERR, "fdopen failed: %m");
 700                 nerr++;
 701                 goto closeall;
 702         }
 703
 704         xostyle = xo_get_style(NULL);
 705         xoinfo = xo_create_to_file(info, xostyle, 0);
 706         if (xoinfo == NULL) {
 707                 syslog(LOG_ERR, "%s: %m", infoname);
 708                 nerr++;
 709                 goto closeall;
 710         }
 711         xo_open_container_h(xoinfo, "crashdump");
 712
 713         if (verbose)
 714                 printheader(xostdout, &kdhl, device, bounds, status);
 715
 716         printheader(xoinfo, &kdhl, device, bounds, status);
 717         xo_close_container_h(xoinfo, "crashdump");
 718         xo_flush_h(xoinfo);
 719         xo_finish_h(xoinfo);
 720         fclose(info);
 721
 722         syslog(LOG_NOTICE, "writing %score to %s/%s",
 723             compress ? "compressed " : "", savedir, corename);
 724
 725         if (istextdump) {
 726                 if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device,
 727                     corename, fp) < 0)
 728                         goto closeall;
 729         } else {
 730                 if (DoRegularFile(fd, dumpsize, buf, device, corename, fp)
 731                     < 0)
 732                         goto closeall;
 733         }
 734         if (verbose)
 735                 printf("\n");
 736
 737         if (fclose(fp) < 0) {
 738                 syslog(LOG_ERR, "error on %s: %m", corename);
 739                 nerr++;
 740                 goto closefd;
 741         }
 742
 743         symlinks_remove();
 744         if (symlink(infoname, "info.last") == -1) {
 745                 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
 746                     savedir, "info.last");
 747         }
 748         if (compress) {
 749                 snprintf(linkname, sizeof(linkname), "%s.last.gz",
 750                     istextdump ? "textdump.tar" : "vmcore");
 751         } else {
 752                 snprintf(linkname, sizeof(linkname), "%s.last",
 753                     istextdump ? "textdump.tar" : "vmcore");
 754         }
 755         if (symlink(corename, linkname) == -1) {
 756                 syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
 757                     savedir, linkname);
 758         }
 759
 760         nsaved++;
 761
 762         if (verbose)
 763                 printf("dump saved\n");
 764
 765 nuke:
 766         if (!keep) {
 767                 if (verbose)
 768                         printf("clearing dump header\n");
 769                 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof(kdhl.magic));
 770                 memcpy(temp, &kdhl, sizeof(kdhl));
 771                 if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
 772                     write(fd, temp, sectorsize) != (ssize_t)sectorsize)
 773                         syslog(LOG_ERR,
 774                             "error while clearing the dump header: %m");
 775         }
 776         xo_close_container_h(xostdout, "crashdump");
 777         xo_finish_h(xostdout);
 778         close(fd);
 779         return;
 780
 781 closeall:
 782         fclose(fp);
 783
 784 closefd:
 785         close(fd);
 786 }
 787
 788 static void
 789 usage(void)
 790 {
 791         xo_error("%s\n%s\n%s\n",
 792             "usage: savecore -c [-v] [device ...]",
 793             "       savecore -C [-v] [device ...]",
 794             "       savecore [-fkvz] [-m maxdumps] [directory [device ...]]");
 795         exit(1);
 796 }
 797
 798 int
 799 main(int argc, char **argv)
 800 {
 801         const char *savedir = ".";
 802         struct fstab *fsp;
 803         int i, ch, error;
 804
 805         checkfor = compress = clear = force = keep = verbose = 0;
 806         nfound = nsaved = nerr = 0;
 807
 808         openlog("savecore", LOG_PERROR, LOG_DAEMON);
 809         signal(SIGINFO, infohandler);
 810
 811         argc = xo_parse_args(argc, argv);
 812         if (argc < 0)
 813                 exit(1);
 814
 815         while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1)
 816                 switch(ch) {
 817                 case 'C':
 818                         checkfor = 1;
 819                         break;
 820                 case 'c':
 821                         clear = 1;
 822                         break;
 823                 case 'f':
 824                         force = 1;
 825                         break;
 826                 case 'k':
 827                         keep = 1;
 828                         break;
 829                 case 'm':
 830                         maxdumps = atoi(optarg);
 831                         if (maxdumps <= 0) {
 832                                 syslog(LOG_ERR, "Invalid maxdump value");
 833                                 exit(1);
 834                         }
 835                         break;
 836                 case 'v':
 837                         verbose++;
 838                         break;
 839                 case 'z':
 840                         compress = 1;
 841                         break;
 842                 case '?':
 843                 default:
 844                         usage();
 845                 }
 846         if (checkfor && (clear || force || keep))
 847                 usage();
 848         if (clear && (compress || keep))
 849                 usage();
 850         if (maxdumps > 0 && (checkfor || clear))
 851                 usage();
 852         argc -= optind;
 853         argv += optind;
 854         if (argc >= 1 && !checkfor && !clear) {
 855                 error = chdir(argv[0]);
 856                 if (error) {
 857                         syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
 858                         exit(1);
 859                 }
 860                 savedir = argv[0];
 861                 argc--;
 862                 argv++;
 863         }
 864         if (argc == 0) {
 865                 for (;;) {
 866                         fsp = getfsent();
 867                         if (fsp == NULL)
 868                                 break;
 869                         if (strcmp(fsp->fs_vfstype, "swap") &&
 870                             strcmp(fsp->fs_vfstype, "dump"))
 871                                 continue;
 872                         DoFile(savedir, fsp->fs_spec);
 873                 }
 874                 endfsent();
 875         } else {
 876                 for (i = 0; i < argc; i++)
 877                         DoFile(savedir, argv[i]);
 878         }
 879
 880         /* Emit minimal output. */
 881         if (nfound == 0) {
 882                 if (checkfor) {
 883                         if (verbose)
 884                                 printf("No dump exists\n");
 885                         exit(1);
 886                 }
 887                 if (verbose)
 888                         syslog(LOG_WARNING, "no dumps found");
 889         } else if (nsaved == 0) {
 890                 if (nerr != 0) {
 891                         if (verbose)
 892                                 syslog(LOG_WARNING, "unsaved dumps found but not saved");
 893                         exit(1);
 894                 } else if (verbose)
 895                         syslog(LOG_WARNING, "no unsaved dumps found");
 896         }
 897
 898         return (0);
 899 }
 900
 901 static void
 902 infohandler(int sig __unused)
 903 {
 904         got_siginfo = 1;
 905 }