bin/named/main.c

   1 /*
   2  * Copyright (C) 2004-2010  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: main.c,v 1.175.166.2 2010/06/26 23:46:39 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <ctype.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include <isc/app.h>
  29 #include <isc/backtrace.h>
  30 #include <isc/commandline.h>
  31 #include <isc/dir.h>
  32 #include <isc/entropy.h>
  33 #include <isc/file.h>
  34 #include <isc/hash.h>
  35 #include <isc/os.h>
  36 #include <isc/platform.h>
  37 #include <isc/print.h>
  38 #include <isc/resource.h>
  39 #include <isc/stdio.h>
  40 #include <isc/string.h>
  41 #include <isc/task.h>
  42 #include <isc/timer.h>
  43 #include <isc/util.h>
  44
  45 #include <isccc/result.h>
  46
  47 #include <dns/dispatch.h>
  48 #include <dns/name.h>
  49 #include <dns/result.h>
  50 #include <dns/view.h>
  51
  52 #include <dst/result.h>
  53
  54 /*
  55  * Defining NS_MAIN provides storage declarations (rather than extern)
  56  * for variables in named/globals.h.
  57  */
  58 #define NS_MAIN 1
  59
  60 #include <named/builtin.h>
  61 #include <named/control.h>
  62 #include <named/globals.h>      /* Explicit, though named/log.h includes it. */
  63 #include <named/interfacemgr.h>
  64 #include <named/log.h>
  65 #include <named/os.h>
  66 #include <named/server.h>
  67 #include <named/lwresd.h>
  68 #include <named/main.h>
  69 #ifdef HAVE_LIBSCF
  70 #include <named/ns_smf_globals.h>
  71 #endif
  72
  73 /*
  74  * Include header files for database drivers here.
  75  */
  76 /* #include "xxdb.h" */
  77
  78 /*
  79  * Include DLZ drivers if appropriate.
  80  */
  81 #ifdef DLZ
  82 #include <dlz/dlz_drivers.h>
  83 #endif
  84
  85 /*
  86  * The maximum number of stack frames to dump on assertion failure.
  87  */
  88 #ifndef BACKTRACE_MAXFRAME
  89 #define BACKTRACE_MAXFRAME 128
  90 #endif
  91
  92 static isc_boolean_t    want_stats = ISC_FALSE;
  93 static char             program_name[ISC_DIR_NAMEMAX] = "named";
  94 static char             absolute_conffile[ISC_DIR_PATHMAX];
  95 static char             saved_command_line[512];
  96 static char             version[512];
  97 static unsigned int     maxsocks = 0;
  98 static int              maxudp = 0;
  99
 100 void
 101 ns_main_earlywarning(const char *format, ...) {
 102         va_list args;
 103
 104         va_start(args, format);
 105         if (ns_g_lctx != NULL) {
 106                 isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 107                                NS_LOGMODULE_MAIN, ISC_LOG_WARNING,
 108                                format, args);
 109         } else {
 110                 fprintf(stderr, "%s: ", program_name);
 111                 vfprintf(stderr, format, args);
 112                 fprintf(stderr, "\n");
 113                 fflush(stderr);
 114         }
 115         va_end(args);
 116 }
 117
 118 void
 119 ns_main_earlyfatal(const char *format, ...) {
 120         va_list args;
 121
 122         va_start(args, format);
 123         if (ns_g_lctx != NULL) {
 124                 isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 125                                NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 126                                format, args);
 127                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 128                                NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 129                                "exiting (due to early fatal error)");
 130         } else {
 131                 fprintf(stderr, "%s: ", program_name);
 132                 vfprintf(stderr, format, args);
 133                 fprintf(stderr, "\n");
 134                 fflush(stderr);
 135         }
 136         va_end(args);
 137
 138         exit(1);
 139 }
 140
 141 ISC_PLATFORM_NORETURN_PRE static void
 142 assertion_failed(const char *file, int line, isc_assertiontype_t type,
 143                  const char *cond) ISC_PLATFORM_NORETURN_POST;
 144
 145 static void
 146 assertion_failed(const char *file, int line, isc_assertiontype_t type,
 147                  const char *cond)
 148 {
 149         void *tracebuf[BACKTRACE_MAXFRAME];
 150         int i, nframes;
 151         isc_result_t result;
 152         const char *logsuffix = "";
 153         const char *fname;
 154
 155         /*
 156          * Handle assertion failures.
 157          */
 158
 159         if (ns_g_lctx != NULL) {
 160                 /*
 161                  * Reset the assertion callback in case it is the log
 162                  * routines causing the assertion.
 163                  */
 164                 isc_assertion_setcallback(NULL);
 165
 166                 result = isc_backtrace_gettrace(tracebuf, BACKTRACE_MAXFRAME,
 167                                                 &nframes);
 168                 if (result == ISC_R_SUCCESS && nframes > 0)
 169                         logsuffix = ", back trace";
 170                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 171                               NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 172                               "%s:%d: %s(%s) failed%s", file, line,
 173                               isc_assertion_typetotext(type), cond, logsuffix);
 174                 if (result == ISC_R_SUCCESS) {
 175                         for (i = 0; i < nframes; i++) {
 176                                 unsigned long offset;
 177
 178                                 fname = NULL;
 179                                 result = isc_backtrace_getsymbol(tracebuf[i],
 180                                                                  &fname,
 181                                                                  &offset);
 182                                 if (result == ISC_R_SUCCESS) {
 183                                         isc_log_write(ns_g_lctx,
 184                                                       NS_LOGCATEGORY_GENERAL,
 185                                                       NS_LOGMODULE_MAIN,
 186                                                       ISC_LOG_CRITICAL,
 187                                                       "#%d %p in %s()+0x%lx", i,
 188                                                       tracebuf[i], fname,
 189                                                       offset);
 190                                 } else {
 191                                         isc_log_write(ns_g_lctx,
 192                                                       NS_LOGCATEGORY_GENERAL,
 193                                                       NS_LOGMODULE_MAIN,
 194                                                       ISC_LOG_CRITICAL,
 195                                                       "#%d %p in ??", i,
 196                                                       tracebuf[i]);
 197                                 }
 198                         }
 199                 }
 200                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 201                               NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 202                               "exiting (due to assertion failure)");
 203         } else {
 204                 fprintf(stderr, "%s:%d: %s(%s) failed\n",
 205                         file, line, isc_assertion_typetotext(type), cond);
 206                 fflush(stderr);
 207         }
 208
 209         if (ns_g_coreok)
 210                 abort();
 211         exit(1);
 212 }
 213
 214 ISC_PLATFORM_NORETURN_PRE static void
 215 library_fatal_error(const char *file, int line, const char *format,
 216                     va_list args)
 217 ISC_FORMAT_PRINTF(3, 0) ISC_PLATFORM_NORETURN_POST;
 218
 219 static void
 220 library_fatal_error(const char *file, int line, const char *format,
 221                     va_list args)
 222 {
 223         /*
 224          * Handle isc_error_fatal() calls from our libraries.
 225          */
 226
 227         if (ns_g_lctx != NULL) {
 228                 /*
 229                  * Reset the error callback in case it is the log
 230                  * routines causing the assertion.
 231                  */
 232                 isc_error_setfatal(NULL);
 233
 234                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 235                               NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 236                               "%s:%d: fatal error:", file, line);
 237                 isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 238                                NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 239                                format, args);
 240                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 241                               NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 242                               "exiting (due to fatal error in library)");
 243         } else {
 244                 fprintf(stderr, "%s:%d: fatal error: ", file, line);
 245                 vfprintf(stderr, format, args);
 246                 fprintf(stderr, "\n");
 247                 fflush(stderr);
 248         }
 249
 250         if (ns_g_coreok)
 251                 abort();
 252         exit(1);
 253 }
 254
 255 static void
 256 library_unexpected_error(const char *file, int line, const char *format,
 257                          va_list args) ISC_FORMAT_PRINTF(3, 0);
 258
 259 static void
 260 library_unexpected_error(const char *file, int line, const char *format,
 261                          va_list args)
 262 {
 263         /*
 264          * Handle isc_error_unexpected() calls from our libraries.
 265          */
 266
 267         if (ns_g_lctx != NULL) {
 268                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 269                               NS_LOGMODULE_MAIN, ISC_LOG_ERROR,
 270                               "%s:%d: unexpected error:", file, line);
 271                 isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 272                                NS_LOGMODULE_MAIN, ISC_LOG_ERROR,
 273                                format, args);
 274         } else {
 275                 fprintf(stderr, "%s:%d: fatal error: ", file, line);
 276                 vfprintf(stderr, format, args);
 277                 fprintf(stderr, "\n");
 278                 fflush(stderr);
 279         }
 280 }
 281
 282 static void
 283 lwresd_usage(void) {
 284         fprintf(stderr,
 285                 "usage: lwresd [-4|-6] [-c conffile | -C resolvconffile] "
 286                 "[-d debuglevel]\n"
 287                 "              [-f|-g] [-n number_of_cpus] [-p port] "
 288                 "[-P listen-port] [-s]\n"
 289                 "              [-t chrootdir] [-u username] [-i pidfile]\n"
 290                 "              [-m {usage|trace|record|size|mctx}]\n");
 291 }
 292
 293 static void
 294 usage(void) {
 295         if (ns_g_lwresdonly) {
 296                 lwresd_usage();
 297                 return;
 298         }
 299         fprintf(stderr,
 300                 "usage: named [-4|-6] [-c conffile] [-d debuglevel] "
 301                 "[-E engine] [-f|-g]\n"
 302                 "             [-n number_of_cpus] [-p port] [-s] "
 303                 "[-t chrootdir] [-u username]\n"
 304                 "             [-m {usage|trace|record|size|mctx}]\n");
 305 }
 306
 307 static void
 308 save_command_line(int argc, char *argv[]) {
 309         int i;
 310         char *src;
 311         char *dst;
 312         char *eob;
 313         const char truncated[] = "...";
 314         isc_boolean_t quoted = ISC_FALSE;
 315
 316         dst = saved_command_line;
 317         eob = saved_command_line + sizeof(saved_command_line);
 318
 319         for (i = 1; i < argc && dst < eob; i++) {
 320                 *dst++ = ' ';
 321
 322                 src = argv[i];
 323                 while (*src != '\0' && dst < eob) {
 324                         /*
 325                          * This won't perfectly produce a shell-independent
 326                          * pastable command line in all circumstances, but
 327                          * comes close, and for practical purposes will
 328                          * nearly always be fine.
 329                          */
 330                         if (quoted || isalnum(*src & 0xff) ||
 331                             *src == '-' || *src == '_' ||
 332                             *src == '.' || *src == '/') {
 333                                 *dst++ = *src++;
 334                                 quoted = ISC_FALSE;
 335                         } else {
 336                                 *dst++ = '\\';
 337                                 quoted = ISC_TRUE;
 338                         }
 339                 }
 340         }
 341
 342         INSIST(sizeof(saved_command_line) >= sizeof(truncated));
 343
 344         if (dst == eob)
 345                 strcpy(eob - sizeof(truncated), truncated);
 346         else
 347                 *dst = '\0';
 348 }
 349
 350 static int
 351 parse_int(char *arg, const char *desc) {
 352         char *endp;
 353         int tmp;
 354         long int ltmp;
 355
 356         ltmp = strtol(arg, &endp, 10);
 357         tmp = (int) ltmp;
 358         if (*endp != '\0')
 359                 ns_main_earlyfatal("%s '%s' must be numeric", desc, arg);
 360         if (tmp < 0 || tmp != ltmp)
 361                 ns_main_earlyfatal("%s '%s' out of range", desc, arg);
 362         return (tmp);
 363 }
 364
 365 static struct flag_def {
 366         const char *name;
 367         unsigned int value;
 368 } mem_debug_flags[] = {
 369         { "trace",  ISC_MEM_DEBUGTRACE },
 370         { "record", ISC_MEM_DEBUGRECORD },
 371         { "usage", ISC_MEM_DEBUGUSAGE },
 372         { "size", ISC_MEM_DEBUGSIZE },
 373         { "mctx", ISC_MEM_DEBUGCTX },
 374         { NULL, 0 }
 375 };
 376
 377 static void
 378 set_flags(const char *arg, struct flag_def *defs, unsigned int *ret) {
 379         for (;;) {
 380                 const struct flag_def *def;
 381                 const char *end = strchr(arg, ',');
 382                 int arglen;
 383                 if (end == NULL)
 384                         end = arg + strlen(arg);
 385                 arglen = end - arg;
 386                 for (def = defs; def->name != NULL; def++) {
 387                         if (arglen == (int)strlen(def->name) &&
 388                             memcmp(arg, def->name, arglen) == 0) {
 389                                 *ret |= def->value;
 390                                 goto found;
 391                         }
 392                 }
 393                 ns_main_earlyfatal("unrecognized flag '%.*s'", arglen, arg);
 394          found:
 395                 if (*end == '\0')
 396                         break;
 397                 arg = end + 1;
 398         }
 399 }
 400
 401 static void
 402 parse_command_line(int argc, char *argv[]) {
 403         int ch;
 404         int port;
 405         isc_boolean_t disable6 = ISC_FALSE;
 406         isc_boolean_t disable4 = ISC_FALSE;
 407
 408         save_command_line(argc, argv);
 409
 410         isc_commandline_errprint = ISC_FALSE;
 411         while ((ch = isc_commandline_parse(argc, argv,
 412                                            "46c:C:d:E:fFgi:lm:n:N:p:P:"
 413                                            "sS:t:T:u:vVx:")) != -1) {
 414                 switch (ch) {
 415                 case '4':
 416                         if (disable4)
 417                                 ns_main_earlyfatal("cannot specify -4 and -6");
 418                         if (isc_net_probeipv4() != ISC_R_SUCCESS)
 419                                 ns_main_earlyfatal("IPv4 not supported by OS");
 420                         isc_net_disableipv6();
 421                         disable6 = ISC_TRUE;
 422                         break;
 423                 case '6':
 424                         if (disable6)
 425                                 ns_main_earlyfatal("cannot specify -4 and -6");
 426                         if (isc_net_probeipv6() != ISC_R_SUCCESS)
 427                                 ns_main_earlyfatal("IPv6 not supported by OS");
 428                         isc_net_disableipv4();
 429                         disable4 = ISC_TRUE;
 430                         break;
 431                 case 'c':
 432                         ns_g_conffile = isc_commandline_argument;
 433                         lwresd_g_conffile = isc_commandline_argument;
 434                         if (lwresd_g_useresolvconf)
 435                                 ns_main_earlyfatal("cannot specify -c and -C");
 436                         ns_g_conffileset = ISC_TRUE;
 437                         break;
 438                 case 'C':
 439                         lwresd_g_resolvconffile = isc_commandline_argument;
 440                         if (ns_g_conffileset)
 441                                 ns_main_earlyfatal("cannot specify -c and -C");
 442                         lwresd_g_useresolvconf = ISC_TRUE;
 443                         break;
 444                 case 'd':
 445                         ns_g_debuglevel = parse_int(isc_commandline_argument,
 446                                                     "debug level");
 447                         break;
 448                 case 'E':
 449                         ns_g_engine = isc_commandline_argument;
 450                         break;
 451                 case 'f':
 452                         ns_g_foreground = ISC_TRUE;
 453                         break;
 454                 case 'g':
 455                         ns_g_foreground = ISC_TRUE;
 456                         ns_g_logstderr = ISC_TRUE;
 457                         break;
 458                 /* XXXBEW -i should be removed */
 459                 case 'i':
 460                         lwresd_g_defaultpidfile = isc_commandline_argument;
 461                         break;
 462                 case 'l':
 463                         ns_g_lwresdonly = ISC_TRUE;
 464                         break;
 465                 case 'm':
 466                         set_flags(isc_commandline_argument, mem_debug_flags,
 467                                   &isc_mem_debugging);
 468                         break;
 469                 case 'N': /* Deprecated. */
 470                 case 'n':
 471                         ns_g_cpus = parse_int(isc_commandline_argument,
 472                                               "number of cpus");
 473                         if (ns_g_cpus == 0)
 474                                 ns_g_cpus = 1;
 475                         break;
 476                 case 'p':
 477                         port = parse_int(isc_commandline_argument, "port");
 478                         if (port < 1 || port > 65535)
 479                                 ns_main_earlyfatal("port '%s' out of range",
 480                                                    isc_commandline_argument);
 481                         ns_g_port = port;
 482                         break;
 483                 /* XXXBEW Should -P be removed? */
 484                 case 'P':
 485                         port = parse_int(isc_commandline_argument, "port");
 486                         if (port < 1 || port > 65535)
 487                                 ns_main_earlyfatal("port '%s' out of range",
 488                                                    isc_commandline_argument);
 489                         lwresd_g_listenport = port;
 490                         break;
 491                 case 's':
 492                         /* XXXRTH temporary syntax */
 493                         want_stats = ISC_TRUE;
 494                         break;
 495                 case 'S':
 496                         maxsocks = parse_int(isc_commandline_argument,
 497                                              "max number of sockets");
 498                         break;
 499                 case 't':
 500                         /* XXXJAB should we make a copy? */
 501                         ns_g_chrootdir = isc_commandline_argument;
 502                         break;
 503                 case 'T':       /* NOT DOCUMENTED */
 504                         /*
 505                          * clienttest: make clients single shot with their
 506                          *             own memory context.
 507                          */
 508                         if (!strcmp(isc_commandline_argument, "clienttest"))
 509                                 ns_g_clienttest = ISC_TRUE;
 510                         else if (!strcmp(isc_commandline_argument, "nosoa"))
 511                                 ns_g_nosoa = ISC_TRUE;
 512                         else if (!strcmp(isc_commandline_argument, "maxudp512"))
 513                                 maxudp = 512;
 514                         else if (!strcmp(isc_commandline_argument, "maxudp1460"))
 515                                 maxudp = 1460;
 516                         else
 517                                 fprintf(stderr, "unknown -T flag '%s\n",
 518                                         isc_commandline_argument);
 519                         break;
 520                 case 'u':
 521                         ns_g_username = isc_commandline_argument;
 522                         break;
 523                 case 'v':
 524                         printf("BIND %s\n", ns_g_version);
 525                         exit(0);
 526                 case 'V':
 527                         printf("BIND %s built with %s\n", ns_g_version,
 528                                 ns_g_configargs);
 529                         exit(0);
 530                 case 'F':
 531                         /* Reserved for FIPS mode */
 532                         /* FALLTHROUGH */
 533                 case '?':
 534                         usage();
 535                         if (isc_commandline_option == '?')
 536                                 exit(0);
 537                         ns_main_earlyfatal("unknown option '-%c'",
 538                                            isc_commandline_option);
 539                         /* FALLTHROUGH */
 540                 default:
 541                         ns_main_earlyfatal("parsing options returned %d", ch);
 542                 }
 543         }
 544
 545         argc -= isc_commandline_index;
 546         argv += isc_commandline_index;
 547
 548         if (argc > 0) {
 549                 usage();
 550                 ns_main_earlyfatal("extra command line arguments");
 551         }
 552 }
 553
 554 static isc_result_t
 555 create_managers(void) {
 556         isc_result_t result;
 557         unsigned int socks;
 558
 559 #ifdef ISC_PLATFORM_USETHREADS
 560         if (ns_g_cpus == 0)
 561                 ns_g_cpus = ns_g_cpus_detected;
 562         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
 563                       ISC_LOG_INFO, "found %u CPU%s, using %u worker thread%s",
 564                       ns_g_cpus_detected, ns_g_cpus_detected == 1 ? "" : "s",
 565                       ns_g_cpus, ns_g_cpus == 1 ? "" : "s");
 566 #else
 567         ns_g_cpus = 1;
 568 #endif
 569         result = isc_taskmgr_create(ns_g_mctx, ns_g_cpus, 0, &ns_g_taskmgr);
 570         if (result != ISC_R_SUCCESS) {
 571                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 572                                  "isc_taskmgr_create() failed: %s",
 573                                  isc_result_totext(result));
 574                 return (ISC_R_UNEXPECTED);
 575         }
 576
 577         result = isc_timermgr_create(ns_g_mctx, &ns_g_timermgr);
 578         if (result != ISC_R_SUCCESS) {
 579                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 580                                  "isc_timermgr_create() failed: %s",
 581                                  isc_result_totext(result));
 582                 return (ISC_R_UNEXPECTED);
 583         }
 584
 585         result = isc_socketmgr_create2(ns_g_mctx, &ns_g_socketmgr, maxsocks);
 586         if (result != ISC_R_SUCCESS) {
 587                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 588                                  "isc_socketmgr_create() failed: %s",
 589                                  isc_result_totext(result));
 590                 return (ISC_R_UNEXPECTED);
 591         }
 592         isc__socketmgr_maxudp(ns_g_socketmgr, maxudp);
 593         result = isc_socketmgr_getmaxsockets(ns_g_socketmgr, &socks);
 594         if (result == ISC_R_SUCCESS) {
 595                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 596                               NS_LOGMODULE_SERVER,
 597                               ISC_LOG_INFO, "using up to %u sockets", socks);
 598         }
 599
 600         result = isc_entropy_create(ns_g_mctx, &ns_g_entropy);
 601         if (result != ISC_R_SUCCESS) {
 602                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 603                                  "isc_entropy_create() failed: %s",
 604                                  isc_result_totext(result));
 605                 return (ISC_R_UNEXPECTED);
 606         }
 607
 608         result = isc_hash_create(ns_g_mctx, ns_g_entropy, DNS_NAME_MAXWIRE);
 609         if (result != ISC_R_SUCCESS) {
 610                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 611                                  "isc_hash_create() failed: %s",
 612                                  isc_result_totext(result));
 613                 return (ISC_R_UNEXPECTED);
 614         }
 615
 616         return (ISC_R_SUCCESS);
 617 }
 618
 619 static void
 620 destroy_managers(void) {
 621         ns_lwresd_shutdown();
 622
 623         isc_entropy_detach(&ns_g_entropy);
 624         if (ns_g_fallbackentropy != NULL)
 625                 isc_entropy_detach(&ns_g_fallbackentropy);
 626
 627         /*
 628          * isc_taskmgr_destroy() will block until all tasks have exited,
 629          */
 630         isc_taskmgr_destroy(&ns_g_taskmgr);
 631         isc_timermgr_destroy(&ns_g_timermgr);
 632         isc_socketmgr_destroy(&ns_g_socketmgr);
 633
 634         /*
 635          * isc_hash_destroy() cannot be called as long as a resolver may be
 636          * running.  Calling this after isc_taskmgr_destroy() ensures the
 637          * call is safe.
 638          */
 639         isc_hash_destroy();
 640 }
 641
 642 static void
 643 dump_symboltable() {
 644         int i;
 645         isc_result_t result;
 646         const char *fname;
 647         const void *addr;
 648
 649         if (isc__backtrace_nsymbols == 0)
 650                 return;
 651
 652         if (!isc_log_wouldlog(ns_g_lctx, ISC_LOG_DEBUG(99)))
 653                 return;
 654
 655         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 656                       ISC_LOG_DEBUG(99), "Symbol table:");
 657
 658         for (i = 0, result = ISC_R_SUCCESS; result == ISC_R_SUCCESS; i++) {
 659                 addr = NULL;
 660                 fname = NULL;
 661                 result = isc_backtrace_getsymbolfromindex(i, &addr, &fname);
 662                 if (result == ISC_R_SUCCESS) {
 663                         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 664                                       NS_LOGMODULE_MAIN, ISC_LOG_DEBUG(99),
 665                                       "[%d] %p %s", i, addr, fname);
 666                 }
 667         }
 668 }
 669
 670 static void
 671 setup(void) {
 672         isc_result_t result;
 673         isc_resourcevalue_t old_openfiles;
 674 #ifdef HAVE_LIBSCF
 675         char *instance = NULL;
 676 #endif
 677
 678         /*
 679          * Get the user and group information before changing the root
 680          * directory, so the administrator does not need to keep a copy
 681          * of the user and group databases in the chroot'ed environment.
 682          */
 683         ns_os_inituserinfo(ns_g_username);
 684
 685         /*
 686          * Initialize time conversion information
 687          */
 688         ns_os_tzset();
 689
 690         ns_os_opendevnull();
 691
 692 #ifdef HAVE_LIBSCF
 693         /* Check if named is under smf control, before chroot. */
 694         result = ns_smf_get_instance(&instance, 0, ns_g_mctx);
 695         /* We don't care about instance, just check if we got one. */
 696         if (result == ISC_R_SUCCESS)
 697                 ns_smf_got_instance = 1;
 698         else
 699                 ns_smf_got_instance = 0;
 700         if (instance != NULL)
 701                 isc_mem_free(ns_g_mctx, instance);
 702 #endif /* HAVE_LIBSCF */
 703
 704 #ifdef PATH_RANDOMDEV
 705         /*
 706          * Initialize system's random device as fallback entropy source
 707          * if running chroot'ed.
 708          */
 709         if (ns_g_chrootdir != NULL) {
 710                 result = isc_entropy_create(ns_g_mctx, &ns_g_fallbackentropy);
 711                 if (result != ISC_R_SUCCESS)
 712                         ns_main_earlyfatal("isc_entropy_create() failed: %s",
 713                                            isc_result_totext(result));
 714
 715                 result = isc_entropy_createfilesource(ns_g_fallbackentropy,
 716                                                       PATH_RANDOMDEV);
 717                 if (result != ISC_R_SUCCESS) {
 718                         ns_main_earlywarning("could not open pre-chroot "
 719                                              "entropy source %s: %s",
 720                                              PATH_RANDOMDEV,
 721                                              isc_result_totext(result));
 722                         isc_entropy_detach(&ns_g_fallbackentropy);
 723                 }
 724         }
 725 #endif
 726
 727 #ifdef ISC_PLATFORM_USETHREADS
 728         /*
 729          * Check for the number of cpu's before ns_os_chroot().
 730          */
 731         ns_g_cpus_detected = isc_os_ncpus();
 732 #endif
 733
 734         ns_os_chroot(ns_g_chrootdir);
 735
 736         /*
 737          * For operating systems which have a capability mechanism, now
 738          * is the time to switch to minimal privs and change our user id.
 739          * On traditional UNIX systems, this call will be a no-op, and we
 740          * will change the user ID after reading the config file the first
 741          * time.  (We need to read the config file to know which possibly
 742          * privileged ports to bind() to.)
 743          */
 744         ns_os_minprivs();
 745
 746         result = ns_log_init(ISC_TF(ns_g_username != NULL));
 747         if (result != ISC_R_SUCCESS)
 748                 ns_main_earlyfatal("ns_log_init() failed: %s",
 749                                    isc_result_totext(result));
 750
 751         /*
 752          * Now is the time to daemonize (if we're not running in the
 753          * foreground).  We waited until now because we wanted to get
 754          * a valid logging context setup.  We cannot daemonize any later,
 755          * because calling create_managers() will create threads, which
 756          * would be lost after fork().
 757          */
 758         if (!ns_g_foreground)
 759                 ns_os_daemonize();
 760
 761         /*
 762          * We call isc_app_start() here as some versions of FreeBSD's fork()
 763          * destroys all the signal handling it sets up.
 764          */
 765         result = isc_app_start();
 766         if (result != ISC_R_SUCCESS)
 767                 ns_main_earlyfatal("isc_app_start() failed: %s",
 768                                    isc_result_totext(result));
 769
 770         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 771                       ISC_LOG_NOTICE, "starting BIND %s%s", ns_g_version,
 772                       saved_command_line);
 773
 774         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 775                       ISC_LOG_NOTICE, "built with %s", ns_g_configargs);
 776
 777         dump_symboltable();
 778
 779         /*
 780          * Get the initial resource limits.
 781          */
 782         (void)isc_resource_getlimit(isc_resource_stacksize,
 783                                     &ns_g_initstacksize);
 784         (void)isc_resource_getlimit(isc_resource_datasize,
 785                                     &ns_g_initdatasize);
 786         (void)isc_resource_getlimit(isc_resource_coresize,
 787                                     &ns_g_initcoresize);
 788         (void)isc_resource_getlimit(isc_resource_openfiles,
 789                                     &ns_g_initopenfiles);
 790
 791         /*
 792          * System resources cannot effectively be tuned on some systems.
 793          * Raise the limit in such cases for safety.
 794          */
 795         old_openfiles = ns_g_initopenfiles;
 796         ns_os_adjustnofile();
 797         (void)isc_resource_getlimit(isc_resource_openfiles,
 798                                     &ns_g_initopenfiles);
 799         if (old_openfiles != ns_g_initopenfiles) {
 800                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 801                               NS_LOGMODULE_MAIN, ISC_LOG_NOTICE,
 802                               "adjusted limit on open files from "
 803                               "%" ISC_PRINT_QUADFORMAT "u to "
 804                               "%" ISC_PRINT_QUADFORMAT "u",
 805                               old_openfiles, ns_g_initopenfiles);
 806         }
 807
 808         /*
 809          * If the named configuration filename is relative, prepend the current
 810          * directory's name before possibly changing to another directory.
 811          */
 812         if (! isc_file_isabsolute(ns_g_conffile)) {
 813                 result = isc_file_absolutepath(ns_g_conffile,
 814                                                absolute_conffile,
 815                                                sizeof(absolute_conffile));
 816                 if (result != ISC_R_SUCCESS)
 817                         ns_main_earlyfatal("could not construct absolute path "
 818                                            "of configuration file: %s",
 819                                            isc_result_totext(result));
 820                 ns_g_conffile = absolute_conffile;
 821         }
 822
 823         /*
 824          * Record the server's startup time.
 825          */
 826         result = isc_time_now(&ns_g_boottime);
 827         if (result != ISC_R_SUCCESS)
 828                 ns_main_earlyfatal("isc_time_now() failed: %s",
 829                                    isc_result_totext(result));
 830
 831         result = create_managers();
 832         if (result != ISC_R_SUCCESS)
 833                 ns_main_earlyfatal("create_managers() failed: %s",
 834                                    isc_result_totext(result));
 835
 836         ns_builtin_init();
 837
 838         /*
 839          * Add calls to register sdb drivers here.
 840          */
 841         /* xxdb_init(); */
 842
 843 #ifdef DLZ
 844         /*
 845          * Register any DLZ drivers.
 846          */
 847         result = dlz_drivers_init();
 848         if (result != ISC_R_SUCCESS)
 849                 ns_main_earlyfatal("dlz_drivers_init() failed: %s",
 850                                    isc_result_totext(result));
 851 #endif
 852
 853         ns_server_create(ns_g_mctx, &ns_g_server);
 854 }
 855
 856 static void
 857 cleanup(void) {
 858         destroy_managers();
 859
 860         ns_server_destroy(&ns_g_server);
 861
 862         ns_builtin_deinit();
 863
 864         /*
 865          * Add calls to unregister sdb drivers here.
 866          */
 867         /* xxdb_clear(); */
 868
 869 #ifdef DLZ
 870         /*
 871          * Unregister any DLZ drivers.
 872          */
 873         dlz_drivers_clear();
 874 #endif
 875
 876         dns_name_destroy();
 877
 878         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 879                       ISC_LOG_NOTICE, "exiting");
 880         ns_log_shutdown();
 881 }
 882
 883 static char *memstats = NULL;
 884
 885 void
 886 ns_main_setmemstats(const char *filename) {
 887         /*
 888          * Caller has to ensure locking.
 889          */
 890
 891         if (memstats != NULL) {
 892                 free(memstats);
 893                 memstats = NULL;
 894         }
 895         if (filename == NULL)
 896                 return;
 897         memstats = malloc(strlen(filename) + 1);
 898         if (memstats)
 899                 strcpy(memstats, filename);
 900 }
 901
 902 #ifdef HAVE_LIBSCF
 903 /*
 904  * Get FMRI for the named process.
 905  */
 906 isc_result_t
 907 ns_smf_get_instance(char **ins_name, int debug, isc_mem_t *mctx) {
 908         scf_handle_t *h = NULL;
 909         int namelen;
 910         char *instance;
 911
 912         REQUIRE(ins_name != NULL && *ins_name == NULL);
 913
 914         if ((h = scf_handle_create(SCF_VERSION)) == NULL) {
 915                 if (debug)
 916                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 917                                          "scf_handle_create() failed: %s",
 918                                          scf_strerror(scf_error()));
 919                 return (ISC_R_FAILURE);
 920         }
 921
 922         if (scf_handle_bind(h) == -1) {
 923                 if (debug)
 924                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 925                                          "scf_handle_bind() failed: %s",
 926                                          scf_strerror(scf_error()));
 927                 scf_handle_destroy(h);
 928                 return (ISC_R_FAILURE);
 929         }
 930
 931         if ((namelen = scf_myname(h, NULL, 0)) == -1) {
 932                 if (debug)
 933                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 934                                          "scf_myname() failed: %s",
 935                                          scf_strerror(scf_error()));
 936                 scf_handle_destroy(h);
 937                 return (ISC_R_FAILURE);
 938         }
 939
 940         if ((instance = isc_mem_allocate(mctx, namelen + 1)) == NULL) {
 941                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 942                                  "ns_smf_get_instance memory "
 943                                  "allocation failed: %s",
 944                                  isc_result_totext(ISC_R_NOMEMORY));
 945                 scf_handle_destroy(h);
 946                 return (ISC_R_FAILURE);
 947         }
 948
 949         if (scf_myname(h, instance, namelen + 1) == -1) {
 950                 if (debug)
 951                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 952                                          "scf_myname() failed: %s",
 953                                          scf_strerror(scf_error()));
 954                 scf_handle_destroy(h);
 955                 isc_mem_free(mctx, instance);
 956                 return (ISC_R_FAILURE);
 957         }
 958
 959         scf_handle_destroy(h);
 960         *ins_name = instance;
 961         return (ISC_R_SUCCESS);
 962 }
 963 #endif /* HAVE_LIBSCF */
 964
 965 int
 966 main(int argc, char *argv[]) {
 967         isc_result_t result;
 968 #ifdef HAVE_LIBSCF
 969         char *instance = NULL;
 970 #endif
 971
 972         /*
 973          * Record version in core image.
 974          * strings named.core | grep "named version:"
 975          */
 976         strlcat(version,
 977 #if defined(NO_VERSION_DATE) || !defined(__DATE__)
 978                 "named version: BIND " VERSION,
 979 #else
 980                 "named version: BIND " VERSION " (" __DATE__ ")",
 981 #endif
 982                 sizeof(version));
 983         result = isc_file_progname(*argv, program_name, sizeof(program_name));
 984         if (result != ISC_R_SUCCESS)
 985                 ns_main_earlyfatal("program name too long");
 986
 987         if (strcmp(program_name, "lwresd") == 0)
 988                 ns_g_lwresdonly = ISC_TRUE;
 989
 990         if (result != ISC_R_SUCCESS)
 991                 ns_main_earlyfatal("failed to build internal symbol table");
 992
 993         isc_assertion_setcallback(assertion_failed);
 994         isc_error_setfatal(library_fatal_error);
 995         isc_error_setunexpected(library_unexpected_error);
 996
 997         ns_os_init(program_name);
 998
 999         dns_result_register();
1000         dst_result_register();
1001         isccc_result_register();
1002
1003         parse_command_line(argc, argv);
1004
1005         /*
1006          * Warn about common configuration error.
1007          */
1008         if (ns_g_chrootdir != NULL) {
1009                 int len = strlen(ns_g_chrootdir);
1010                 if (strncmp(ns_g_chrootdir, ns_g_conffile, len) == 0 &&
1011                     (ns_g_conffile[len] == '/' || ns_g_conffile[len] == '\\'))
1012                         ns_main_earlywarning("config filename (-c %s) contains "
1013                                              "chroot path (-t %s)",
1014                                              ns_g_conffile, ns_g_chrootdir);
1015         }
1016
1017         result = isc_mem_create(0, 0, &ns_g_mctx);
1018         if (result != ISC_R_SUCCESS)
1019                 ns_main_earlyfatal("isc_mem_create() failed: %s",
1020                                    isc_result_totext(result));
1021         isc_mem_setname(ns_g_mctx, "main", NULL);
1022
1023         setup();
1024
1025         /*
1026          * Start things running and then wait for a shutdown request
1027          * or reload.
1028          */
1029         do {
1030                 result = isc_app_run();
1031
1032                 if (result == ISC_R_RELOAD) {
1033                         ns_server_reloadwanted(ns_g_server);
1034                 } else if (result != ISC_R_SUCCESS) {
1035                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1036                                          "isc_app_run(): %s",
1037                                          isc_result_totext(result));
1038                         /*
1039                          * Force exit.
1040                          */
1041                         result = ISC_R_SUCCESS;
1042                 }
1043         } while (result != ISC_R_SUCCESS);
1044
1045 #ifdef HAVE_LIBSCF
1046         if (ns_smf_want_disable == 1) {
1047                 result = ns_smf_get_instance(&instance, 1, ns_g_mctx);
1048                 if (result == ISC_R_SUCCESS && instance != NULL) {
1049                         if (smf_disable_instance(instance, 0) != 0)
1050                                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1051                                                  "smf_disable_instance() "
1052                                                  "failed for %s : %s",
1053                                                  instance,
1054                                                  scf_strerror(scf_error()));
1055                 }
1056                 if (instance != NULL)
1057                         isc_mem_free(ns_g_mctx, instance);
1058         }
1059 #endif /* HAVE_LIBSCF */
1060
1061         cleanup();
1062
1063         if (want_stats) {
1064                 isc_mem_stats(ns_g_mctx, stdout);
1065                 isc_mutex_stats(stdout);
1066         }
1067
1068         if (ns_g_memstatistics && memstats != NULL) {
1069                 FILE *fp = NULL;
1070                 result = isc_stdio_open(memstats, "w", &fp);
1071                 if (result == ISC_R_SUCCESS) {
1072                         isc_mem_stats(ns_g_mctx, fp);
1073                         isc_mutex_stats(fp);
1074                         isc_stdio_close(fp);
1075                 }
1076         }
1077         isc_mem_destroy(&ns_g_mctx);
1078         isc_mem_checkdestroyed(stderr);
1079
1080         ns_main_setmemstats(NULL);
1081
1082         isc_app_finish();
1083
1084         ns_os_closedevnull();
1085
1086         ns_os_shutdown();
1087
1088         return (0);
1089 }