contrib/bind9/bin/named/main.c

   1 /*
   2  * Copyright (C) 2004-2013  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 /* $Id$ */
  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 #include <dlz/dlz_dlopen_driver.h>
  55
  56 /*
  57  * Defining NS_MAIN provides storage declarations (rather than extern)
  58  * for variables in named/globals.h.
  59  */
  60 #define NS_MAIN 1
  61
  62 #include <named/builtin.h>
  63 #include <named/control.h>
  64 #include <named/globals.h>      /* Explicit, though named/log.h includes it. */
  65 #include <named/interfacemgr.h>
  66 #include <named/log.h>
  67 #include <named/os.h>
  68 #include <named/server.h>
  69 #include <named/lwresd.h>
  70 #include <named/main.h>
  71 #ifdef HAVE_LIBSCF
  72 #include <named/ns_smf_globals.h>
  73 #endif
  74
  75 #ifdef OPENSSL
  76 #include <openssl/opensslv.h>
  77 #endif
  78 #ifdef HAVE_LIBXML2
  79 #include <libxml/xmlversion.h>
  80 #endif
  81 /*
  82  * Include header files for database drivers here.
  83  */
  84 /* #include "xxdb.h" */
  85
  86 #ifdef CONTRIB_DLZ
  87 /*
  88  * Include contributed DLZ drivers if appropriate.
  89  */
  90 #include <dlz/dlz_drivers.h>
  91 #endif
  92
  93 /*
  94  * The maximum number of stack frames to dump on assertion failure.
  95  */
  96 #ifndef BACKTRACE_MAXFRAME
  97 #define BACKTRACE_MAXFRAME 128
  98 #endif
  99
 100 static isc_boolean_t    want_stats = ISC_FALSE;
 101 static char             program_name[ISC_DIR_NAMEMAX] = "named";
 102 static char             absolute_conffile[ISC_DIR_PATHMAX];
 103 static char             saved_command_line[512];
 104 static char             version[512];
 105 static unsigned int     maxsocks = 0;
 106 static int              maxudp = 0;
 107
 108 void
 109 ns_main_earlywarning(const char *format, ...) {
 110         va_list args;
 111
 112         va_start(args, format);
 113         if (ns_g_lctx != NULL) {
 114                 isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 115                                NS_LOGMODULE_MAIN, ISC_LOG_WARNING,
 116                                format, args);
 117         } else {
 118                 fprintf(stderr, "%s: ", program_name);
 119                 vfprintf(stderr, format, args);
 120                 fprintf(stderr, "\n");
 121                 fflush(stderr);
 122         }
 123         va_end(args);
 124 }
 125
 126 void
 127 ns_main_earlyfatal(const char *format, ...) {
 128         va_list args;
 129
 130         va_start(args, format);
 131         if (ns_g_lctx != NULL) {
 132                 isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 133                                NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 134                                format, args);
 135                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 136                                NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 137                                "exiting (due to early fatal error)");
 138         } else {
 139                 fprintf(stderr, "%s: ", program_name);
 140                 vfprintf(stderr, format, args);
 141                 fprintf(stderr, "\n");
 142                 fflush(stderr);
 143         }
 144         va_end(args);
 145
 146         exit(1);
 147 }
 148
 149 ISC_PLATFORM_NORETURN_PRE static void
 150 assertion_failed(const char *file, int line, isc_assertiontype_t type,
 151                  const char *cond) ISC_PLATFORM_NORETURN_POST;
 152
 153 static void
 154 assertion_failed(const char *file, int line, isc_assertiontype_t type,
 155                  const char *cond)
 156 {
 157         void *tracebuf[BACKTRACE_MAXFRAME];
 158         int i, nframes;
 159         isc_result_t result;
 160         const char *logsuffix = "";
 161         const char *fname;
 162
 163         /*
 164          * Handle assertion failures.
 165          */
 166
 167         if (ns_g_lctx != NULL) {
 168                 /*
 169                  * Reset the assertion callback in case it is the log
 170                  * routines causing the assertion.
 171                  */
 172                 isc_assertion_setcallback(NULL);
 173
 174                 result = isc_backtrace_gettrace(tracebuf, BACKTRACE_MAXFRAME,
 175                                                 &nframes);
 176                 if (result == ISC_R_SUCCESS && nframes > 0)
 177                         logsuffix = ", back trace";
 178                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 179                               NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 180                               "%s:%d: %s(%s) failed%s", file, line,
 181                               isc_assertion_typetotext(type), cond, logsuffix);
 182                 if (result == ISC_R_SUCCESS) {
 183                         for (i = 0; i < nframes; i++) {
 184                                 unsigned long offset;
 185
 186                                 fname = NULL;
 187                                 result = isc_backtrace_getsymbol(tracebuf[i],
 188                                                                  &fname,
 189                                                                  &offset);
 190                                 if (result == ISC_R_SUCCESS) {
 191                                         isc_log_write(ns_g_lctx,
 192                                                       NS_LOGCATEGORY_GENERAL,
 193                                                       NS_LOGMODULE_MAIN,
 194                                                       ISC_LOG_CRITICAL,
 195                                                       "#%d %p in %s()+0x%lx", i,
 196                                                       tracebuf[i], fname,
 197                                                       offset);
 198                                 } else {
 199                                         isc_log_write(ns_g_lctx,
 200                                                       NS_LOGCATEGORY_GENERAL,
 201                                                       NS_LOGMODULE_MAIN,
 202                                                       ISC_LOG_CRITICAL,
 203                                                       "#%d %p in ??", i,
 204                                                       tracebuf[i]);
 205                                 }
 206                         }
 207                 }
 208                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 209                               NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 210                               "exiting (due to assertion failure)");
 211         } else {
 212                 fprintf(stderr, "%s:%d: %s(%s) failed\n",
 213                         file, line, isc_assertion_typetotext(type), cond);
 214                 fflush(stderr);
 215         }
 216
 217         if (ns_g_coreok)
 218                 abort();
 219         exit(1);
 220 }
 221
 222 ISC_PLATFORM_NORETURN_PRE static void
 223 library_fatal_error(const char *file, int line, const char *format,
 224                     va_list args)
 225 ISC_FORMAT_PRINTF(3, 0) ISC_PLATFORM_NORETURN_POST;
 226
 227 static void
 228 library_fatal_error(const char *file, int line, const char *format,
 229                     va_list args)
 230 {
 231         /*
 232          * Handle isc_error_fatal() calls from our libraries.
 233          */
 234
 235         if (ns_g_lctx != NULL) {
 236                 /*
 237                  * Reset the error callback in case it is the log
 238                  * routines causing the assertion.
 239                  */
 240                 isc_error_setfatal(NULL);
 241
 242                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 243                               NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 244                               "%s:%d: fatal error:", file, line);
 245                 isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 246                                NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 247                                format, args);
 248                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 249                               NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
 250                               "exiting (due to fatal error in library)");
 251         } else {
 252                 fprintf(stderr, "%s:%d: fatal error: ", file, line);
 253                 vfprintf(stderr, format, args);
 254                 fprintf(stderr, "\n");
 255                 fflush(stderr);
 256         }
 257
 258         if (ns_g_coreok)
 259                 abort();
 260         exit(1);
 261 }
 262
 263 static void
 264 library_unexpected_error(const char *file, int line, const char *format,
 265                          va_list args) ISC_FORMAT_PRINTF(3, 0);
 266
 267 static void
 268 library_unexpected_error(const char *file, int line, const char *format,
 269                          va_list args)
 270 {
 271         /*
 272          * Handle isc_error_unexpected() calls from our libraries.
 273          */
 274
 275         if (ns_g_lctx != NULL) {
 276                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 277                               NS_LOGMODULE_MAIN, ISC_LOG_ERROR,
 278                               "%s:%d: unexpected error:", file, line);
 279                 isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 280                                NS_LOGMODULE_MAIN, ISC_LOG_ERROR,
 281                                format, args);
 282         } else {
 283                 fprintf(stderr, "%s:%d: fatal error: ", file, line);
 284                 vfprintf(stderr, format, args);
 285                 fprintf(stderr, "\n");
 286                 fflush(stderr);
 287         }
 288 }
 289
 290 static void
 291 lwresd_usage(void) {
 292         fprintf(stderr,
 293                 "usage: lwresd [-4|-6] [-c conffile | -C resolvconffile] "
 294                 "[-d debuglevel]\n"
 295                 "              [-f|-g] [-n number_of_cpus] [-p port] "
 296                 "[-P listen-port] [-s]\n"
 297                 "              [-t chrootdir] [-u username] [-i pidfile]\n"
 298                 "              [-m {usage|trace|record|size|mctx}]\n");
 299 }
 300
 301 static void
 302 usage(void) {
 303         if (ns_g_lwresdonly) {
 304                 lwresd_usage();
 305                 return;
 306         }
 307         fprintf(stderr,
 308                 "usage: named [-4|-6] [-c conffile] [-d debuglevel] "
 309                 "[-E engine] [-f|-g]\n"
 310                 "             [-n number_of_cpus] [-p port] [-s] "
 311                 "[-t chrootdir] [-u username]\n"
 312                 "             [-m {usage|trace|record|size|mctx}]\n");
 313 }
 314
 315 static void
 316 save_command_line(int argc, char *argv[]) {
 317         int i;
 318         char *src;
 319         char *dst;
 320         char *eob;
 321         const char truncated[] = "...";
 322         isc_boolean_t quoted = ISC_FALSE;
 323
 324         dst = saved_command_line;
 325         eob = saved_command_line + sizeof(saved_command_line);
 326
 327         for (i = 1; i < argc && dst < eob; i++) {
 328                 *dst++ = ' ';
 329
 330                 src = argv[i];
 331                 while (*src != '\0' && dst < eob) {
 332                         /*
 333                          * This won't perfectly produce a shell-independent
 334                          * pastable command line in all circumstances, but
 335                          * comes close, and for practical purposes will
 336                          * nearly always be fine.
 337                          */
 338                         if (quoted || isalnum(*src & 0xff) ||
 339                             *src == '-' || *src == '_' ||
 340                             *src == '.' || *src == '/') {
 341                                 *dst++ = *src++;
 342                                 quoted = ISC_FALSE;
 343                         } else {
 344                                 *dst++ = '\\';
 345                                 quoted = ISC_TRUE;
 346                         }
 347                 }
 348         }
 349
 350         INSIST(sizeof(saved_command_line) >= sizeof(truncated));
 351
 352         if (dst == eob)
 353                 strcpy(eob - sizeof(truncated), truncated);
 354         else
 355                 *dst = '\0';
 356 }
 357
 358 static int
 359 parse_int(char *arg, const char *desc) {
 360         char *endp;
 361         int tmp;
 362         long int ltmp;
 363
 364         ltmp = strtol(arg, &endp, 10);
 365         tmp = (int) ltmp;
 366         if (*endp != '\0')
 367                 ns_main_earlyfatal("%s '%s' must be numeric", desc, arg);
 368         if (tmp < 0 || tmp != ltmp)
 369                 ns_main_earlyfatal("%s '%s' out of range", desc, arg);
 370         return (tmp);
 371 }
 372
 373 static struct flag_def {
 374         const char *name;
 375         unsigned int value;
 376 } mem_debug_flags[] = {
 377         { "trace",  ISC_MEM_DEBUGTRACE },
 378         { "record", ISC_MEM_DEBUGRECORD },
 379         { "usage", ISC_MEM_DEBUGUSAGE },
 380         { "size", ISC_MEM_DEBUGSIZE },
 381         { "mctx", ISC_MEM_DEBUGCTX },
 382         { NULL, 0 }
 383 };
 384
 385 static void
 386 set_flags(const char *arg, struct flag_def *defs, unsigned int *ret) {
 387         for (;;) {
 388                 const struct flag_def *def;
 389                 const char *end = strchr(arg, ',');
 390                 int arglen;
 391                 if (end == NULL)
 392                         end = arg + strlen(arg);
 393                 arglen = end - arg;
 394                 for (def = defs; def->name != NULL; def++) {
 395                         if (arglen == (int)strlen(def->name) &&
 396                             memcmp(arg, def->name, arglen) == 0) {
 397                                 *ret |= def->value;
 398                                 goto found;
 399                         }
 400                 }
 401                 ns_main_earlyfatal("unrecognized flag '%.*s'", arglen, arg);
 402          found:
 403                 if (*end == '\0')
 404                         break;
 405                 arg = end + 1;
 406         }
 407 }
 408
 409 static void
 410 parse_command_line(int argc, char *argv[]) {
 411         int ch;
 412         int port;
 413         isc_boolean_t disable6 = ISC_FALSE;
 414         isc_boolean_t disable4 = ISC_FALSE;
 415
 416         save_command_line(argc, argv);
 417
 418         isc_commandline_errprint = ISC_FALSE;
 419         while ((ch = isc_commandline_parse(argc, argv,
 420                                            "46c:C:d:E:fFgi:lm:n:N:p:P:"
 421                                            "sS:t:T:U:u:vVx:")) != -1) {
 422                 switch (ch) {
 423                 case '4':
 424                         if (disable4)
 425                                 ns_main_earlyfatal("cannot specify -4 and -6");
 426                         if (isc_net_probeipv4() != ISC_R_SUCCESS)
 427                                 ns_main_earlyfatal("IPv4 not supported by OS");
 428                         isc_net_disableipv6();
 429                         disable6 = ISC_TRUE;
 430                         break;
 431                 case '6':
 432                         if (disable6)
 433                                 ns_main_earlyfatal("cannot specify -4 and -6");
 434                         if (isc_net_probeipv6() != ISC_R_SUCCESS)
 435                                 ns_main_earlyfatal("IPv6 not supported by OS");
 436                         isc_net_disableipv4();
 437                         disable4 = ISC_TRUE;
 438                         break;
 439                 case 'c':
 440                         ns_g_conffile = isc_commandline_argument;
 441                         lwresd_g_conffile = isc_commandline_argument;
 442                         if (lwresd_g_useresolvconf)
 443                                 ns_main_earlyfatal("cannot specify -c and -C");
 444                         ns_g_conffileset = ISC_TRUE;
 445                         break;
 446                 case 'C':
 447                         lwresd_g_resolvconffile = isc_commandline_argument;
 448                         if (ns_g_conffileset)
 449                                 ns_main_earlyfatal("cannot specify -c and -C");
 450                         lwresd_g_useresolvconf = ISC_TRUE;
 451                         break;
 452                 case 'd':
 453                         ns_g_debuglevel = parse_int(isc_commandline_argument,
 454                                                     "debug level");
 455                         break;
 456                 case 'E':
 457                         ns_g_engine = isc_commandline_argument;
 458                         break;
 459                 case 'f':
 460                         ns_g_foreground = ISC_TRUE;
 461                         break;
 462                 case 'g':
 463                         ns_g_foreground = ISC_TRUE;
 464                         ns_g_logstderr = ISC_TRUE;
 465                         break;
 466                 /* XXXBEW -i should be removed */
 467                 case 'i':
 468                         lwresd_g_defaultpidfile = isc_commandline_argument;
 469                         break;
 470                 case 'l':
 471                         ns_g_lwresdonly = ISC_TRUE;
 472                         break;
 473                 case 'm':
 474                         set_flags(isc_commandline_argument, mem_debug_flags,
 475                                   &isc_mem_debugging);
 476                         break;
 477                 case 'N': /* Deprecated. */
 478                 case 'n':
 479                         ns_g_cpus = parse_int(isc_commandline_argument,
 480                                               "number of cpus");
 481                         if (ns_g_cpus == 0)
 482                                 ns_g_cpus = 1;
 483                         break;
 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                         ns_g_port = port;
 490                         break;
 491                 /* XXXBEW Should -P be removed? */
 492                 case 'P':
 493                         port = parse_int(isc_commandline_argument, "port");
 494                         if (port < 1 || port > 65535)
 495                                 ns_main_earlyfatal("port '%s' out of range",
 496                                                    isc_commandline_argument);
 497                         lwresd_g_listenport = port;
 498                         break;
 499                 case 's':
 500                         /* XXXRTH temporary syntax */
 501                         want_stats = ISC_TRUE;
 502                         break;
 503                 case 'S':
 504                         maxsocks = parse_int(isc_commandline_argument,
 505                                              "max number of sockets");
 506                         break;
 507                 case 't':
 508                         /* XXXJAB should we make a copy? */
 509                         ns_g_chrootdir = isc_commandline_argument;
 510                         break;
 511                 case 'T':       /* NOT DOCUMENTED */
 512                         /*
 513                          * clienttest: make clients single shot with their
 514                          *             own memory context.
 515                          */
 516                         if (!strcmp(isc_commandline_argument, "clienttest"))
 517                                 ns_g_clienttest = ISC_TRUE;
 518                         else if (!strcmp(isc_commandline_argument, "nosoa"))
 519                                 ns_g_nosoa = ISC_TRUE;
 520                         else if (!strcmp(isc_commandline_argument, "noaa"))
 521                                 ns_g_noaa = ISC_TRUE;
 522                         else if (!strcmp(isc_commandline_argument, "maxudp512"))
 523                                 maxudp = 512;
 524                         else if (!strcmp(isc_commandline_argument, "maxudp1460"))
 525                                 maxudp = 1460;
 526                         else if (!strcmp(isc_commandline_argument, "nosyslog"))
 527                                 ns_g_nosyslog = ISC_TRUE;
 528                         else if (!strcmp(isc_commandline_argument, "nonearest"))
 529                                 ns_g_nonearest = ISC_TRUE;
 530                         else
 531                                 fprintf(stderr, "unknown -T flag '%s\n",
 532                                         isc_commandline_argument);
 533                         break;
 534                 case 'U':
 535                         ns_g_udpdisp = parse_int(isc_commandline_argument,
 536                                                  "number of UDP listeners "
 537                                                  "per interface");
 538                         break;
 539                 case 'u':
 540                         ns_g_username = isc_commandline_argument;
 541                         break;
 542                 case 'v':
 543                         printf("%s %s", ns_g_product, ns_g_version);
 544                         if (*ns_g_description != 0)
 545                                 printf(" %s", ns_g_description);
 546                         printf("\n");
 547                         exit(0);
 548                 case 'V':
 549                         printf("%s %s", ns_g_product, ns_g_version);
 550                         if (*ns_g_description != 0)
 551                                 printf(" %s", ns_g_description);
 552                         printf(" <id:%s> built with %s\n", ns_g_srcid,
 553                                 ns_g_configargs);
 554 #ifdef OPENSSL
 555                         printf("using OpenSSL version: %s\n",
 556                                OPENSSL_VERSION_TEXT);
 557 #endif
 558 #ifdef HAVE_LIBXML2
 559                         printf("using libxml2 version: %s\n",
 560                                LIBXML_DOTTED_VERSION);
 561 #endif
 562                         exit(0);
 563                 case 'F':
 564                         /* Reserved for FIPS mode */
 565                         /* FALLTHROUGH */
 566                 case '?':
 567                         usage();
 568                         if (isc_commandline_option == '?')
 569                                 exit(0);
 570                         ns_main_earlyfatal("unknown option '-%c'",
 571                                            isc_commandline_option);
 572                         /* FALLTHROUGH */
 573                 default:
 574                         ns_main_earlyfatal("parsing options returned %d", ch);
 575                 }
 576         }
 577
 578         argc -= isc_commandline_index;
 579         argv += isc_commandline_index;
 580         POST(argv);
 581
 582         if (argc > 0) {
 583                 usage();
 584                 ns_main_earlyfatal("extra command line arguments");
 585         }
 586 }
 587
 588 static isc_result_t
 589 create_managers(void) {
 590         isc_result_t result;
 591         unsigned int socks;
 592
 593 #ifdef ISC_PLATFORM_USETHREADS
 594         if (ns_g_cpus == 0)
 595                 ns_g_cpus = ns_g_cpus_detected;
 596         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
 597                       ISC_LOG_INFO, "found %u CPU%s, using %u worker thread%s",
 598                       ns_g_cpus_detected, ns_g_cpus_detected == 1 ? "" : "s",
 599                       ns_g_cpus, ns_g_cpus == 1 ? "" : "s");
 600 #else
 601         ns_g_cpus = 1;
 602 #endif
 603 #ifdef WIN32
 604         ns_g_udpdisp = 1;
 605 #else
 606         if (ns_g_udpdisp == 0)
 607                 ns_g_udpdisp = ns_g_cpus_detected;
 608         if (ns_g_udpdisp > ns_g_cpus)
 609                 ns_g_udpdisp = ns_g_cpus;
 610 #endif
 611         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
 612                       ISC_LOG_INFO, "using %u UDP listener%s per interface",
 613                       ns_g_udpdisp, ns_g_udpdisp == 1 ? "" : "s");
 614
 615         result = isc_taskmgr_create(ns_g_mctx, ns_g_cpus, 0, &ns_g_taskmgr);
 616         if (result != ISC_R_SUCCESS) {
 617                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 618                                  "isc_taskmgr_create() failed: %s",
 619                                  isc_result_totext(result));
 620                 return (ISC_R_UNEXPECTED);
 621         }
 622
 623         result = isc_timermgr_create(ns_g_mctx, &ns_g_timermgr);
 624         if (result != ISC_R_SUCCESS) {
 625                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 626                                  "isc_timermgr_create() failed: %s",
 627                                  isc_result_totext(result));
 628                 return (ISC_R_UNEXPECTED);
 629         }
 630
 631         result = isc_socketmgr_create2(ns_g_mctx, &ns_g_socketmgr, maxsocks);
 632         if (result != ISC_R_SUCCESS) {
 633                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 634                                  "isc_socketmgr_create() failed: %s",
 635                                  isc_result_totext(result));
 636                 return (ISC_R_UNEXPECTED);
 637         }
 638         isc__socketmgr_maxudp(ns_g_socketmgr, maxudp);
 639         result = isc_socketmgr_getmaxsockets(ns_g_socketmgr, &socks);
 640         if (result == ISC_R_SUCCESS) {
 641                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 642                               NS_LOGMODULE_SERVER,
 643                               ISC_LOG_INFO, "using up to %u sockets", socks);
 644         }
 645
 646         result = isc_entropy_create(ns_g_mctx, &ns_g_entropy);
 647         if (result != ISC_R_SUCCESS) {
 648                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 649                                  "isc_entropy_create() failed: %s",
 650                                  isc_result_totext(result));
 651                 return (ISC_R_UNEXPECTED);
 652         }
 653
 654         result = isc_hash_create(ns_g_mctx, ns_g_entropy, DNS_NAME_MAXWIRE);
 655         if (result != ISC_R_SUCCESS) {
 656                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 657                                  "isc_hash_create() failed: %s",
 658                                  isc_result_totext(result));
 659                 return (ISC_R_UNEXPECTED);
 660         }
 661
 662         return (ISC_R_SUCCESS);
 663 }
 664
 665 static void
 666 destroy_managers(void) {
 667         ns_lwresd_shutdown();
 668
 669         isc_entropy_detach(&ns_g_entropy);
 670         if (ns_g_fallbackentropy != NULL)
 671                 isc_entropy_detach(&ns_g_fallbackentropy);
 672
 673         /*
 674          * isc_taskmgr_destroy() will block until all tasks have exited,
 675          */
 676         isc_taskmgr_destroy(&ns_g_taskmgr);
 677         isc_timermgr_destroy(&ns_g_timermgr);
 678         isc_socketmgr_destroy(&ns_g_socketmgr);
 679
 680         /*
 681          * isc_hash_destroy() cannot be called as long as a resolver may be
 682          * running.  Calling this after isc_taskmgr_destroy() ensures the
 683          * call is safe.
 684          */
 685         isc_hash_destroy();
 686 }
 687
 688 static void
 689 dump_symboltable() {
 690         int i;
 691         isc_result_t result;
 692         const char *fname;
 693         const void *addr;
 694
 695         if (isc__backtrace_nsymbols == 0)
 696                 return;
 697
 698         if (!isc_log_wouldlog(ns_g_lctx, ISC_LOG_DEBUG(99)))
 699                 return;
 700
 701         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 702                       ISC_LOG_DEBUG(99), "Symbol table:");
 703
 704         for (i = 0, result = ISC_R_SUCCESS; result == ISC_R_SUCCESS; i++) {
 705                 addr = NULL;
 706                 fname = NULL;
 707                 result = isc_backtrace_getsymbolfromindex(i, &addr, &fname);
 708                 if (result == ISC_R_SUCCESS) {
 709                         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 710                                       NS_LOGMODULE_MAIN, ISC_LOG_DEBUG(99),
 711                                       "[%d] %p %s", i, addr, fname);
 712                 }
 713         }
 714 }
 715
 716 static void
 717 setup(void) {
 718         isc_result_t result;
 719         isc_resourcevalue_t old_openfiles;
 720 #ifdef HAVE_LIBSCF
 721         char *instance = NULL;
 722 #endif
 723
 724         /*
 725          * Get the user and group information before changing the root
 726          * directory, so the administrator does not need to keep a copy
 727          * of the user and group databases in the chroot'ed environment.
 728          */
 729         ns_os_inituserinfo(ns_g_username);
 730
 731         /*
 732          * Initialize time conversion information
 733          */
 734         ns_os_tzset();
 735
 736         ns_os_opendevnull();
 737
 738 #ifdef HAVE_LIBSCF
 739         /* Check if named is under smf control, before chroot. */
 740         result = ns_smf_get_instance(&instance, 0, ns_g_mctx);
 741         /* We don't care about instance, just check if we got one. */
 742         if (result == ISC_R_SUCCESS)
 743                 ns_smf_got_instance = 1;
 744         else
 745                 ns_smf_got_instance = 0;
 746         if (instance != NULL)
 747                 isc_mem_free(ns_g_mctx, instance);
 748 #endif /* HAVE_LIBSCF */
 749
 750 #ifdef PATH_RANDOMDEV
 751         /*
 752          * Initialize system's random device as fallback entropy source
 753          * if running chroot'ed.
 754          */
 755         if (ns_g_chrootdir != NULL) {
 756                 result = isc_entropy_create(ns_g_mctx, &ns_g_fallbackentropy);
 757                 if (result != ISC_R_SUCCESS)
 758                         ns_main_earlyfatal("isc_entropy_create() failed: %s",
 759                                            isc_result_totext(result));
 760
 761                 result = isc_entropy_createfilesource(ns_g_fallbackentropy,
 762                                                       PATH_RANDOMDEV);
 763                 if (result != ISC_R_SUCCESS) {
 764                         ns_main_earlywarning("could not open pre-chroot "
 765                                              "entropy source %s: %s",
 766                                              PATH_RANDOMDEV,
 767                                              isc_result_totext(result));
 768                         isc_entropy_detach(&ns_g_fallbackentropy);
 769                 }
 770         }
 771 #endif
 772
 773 #ifdef ISC_PLATFORM_USETHREADS
 774         /*
 775          * Check for the number of cpu's before ns_os_chroot().
 776          */
 777         ns_g_cpus_detected = isc_os_ncpus();
 778 #endif
 779
 780         ns_os_chroot(ns_g_chrootdir);
 781
 782         /*
 783          * For operating systems which have a capability mechanism, now
 784          * is the time to switch to minimal privs and change our user id.
 785          * On traditional UNIX systems, this call will be a no-op, and we
 786          * will change the user ID after reading the config file the first
 787          * time.  (We need to read the config file to know which possibly
 788          * privileged ports to bind() to.)
 789          */
 790         ns_os_minprivs();
 791
 792         result = ns_log_init(ISC_TF(ns_g_username != NULL));
 793         if (result != ISC_R_SUCCESS)
 794                 ns_main_earlyfatal("ns_log_init() failed: %s",
 795                                    isc_result_totext(result));
 796
 797         /*
 798          * Now is the time to daemonize (if we're not running in the
 799          * foreground).  We waited until now because we wanted to get
 800          * a valid logging context setup.  We cannot daemonize any later,
 801          * because calling create_managers() will create threads, which
 802          * would be lost after fork().
 803          */
 804         if (!ns_g_foreground)
 805                 ns_os_daemonize();
 806
 807         /*
 808          * We call isc_app_start() here as some versions of FreeBSD's fork()
 809          * destroys all the signal handling it sets up.
 810          */
 811         result = isc_app_start();
 812         if (result != ISC_R_SUCCESS)
 813                 ns_main_earlyfatal("isc_app_start() failed: %s",
 814                                    isc_result_totext(result));
 815
 816         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 817                       ISC_LOG_NOTICE, "starting %s %s%s", ns_g_product,
 818                       ns_g_version, saved_command_line);
 819
 820         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 821                       ISC_LOG_NOTICE, "built with %s", ns_g_configargs);
 822
 823         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 824                       ISC_LOG_NOTICE,
 825                       "----------------------------------------------------");
 826         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 827                       ISC_LOG_NOTICE,
 828                       "BIND 9 is maintained by Internet Systems Consortium,");
 829         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 830                       ISC_LOG_NOTICE,
 831                       "Inc. (ISC), a non-profit 501(c)(3) public-benefit ");
 832         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 833                       ISC_LOG_NOTICE,
 834                       "corporation.  Support and training for BIND 9 are ");
 835         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 836                       ISC_LOG_NOTICE,
 837                       "available at https://www.isc.org/support");
 838         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 839                       ISC_LOG_NOTICE,
 840                       "----------------------------------------------------");
 841
 842         dump_symboltable();
 843
 844         /*
 845          * Get the initial resource limits.
 846          */
 847         (void)isc_resource_getlimit(isc_resource_stacksize,
 848                                     &ns_g_initstacksize);
 849         (void)isc_resource_getlimit(isc_resource_datasize,
 850                                     &ns_g_initdatasize);
 851         (void)isc_resource_getlimit(isc_resource_coresize,
 852                                     &ns_g_initcoresize);
 853         (void)isc_resource_getlimit(isc_resource_openfiles,
 854                                     &ns_g_initopenfiles);
 855
 856         /*
 857          * System resources cannot effectively be tuned on some systems.
 858          * Raise the limit in such cases for safety.
 859          */
 860         old_openfiles = ns_g_initopenfiles;
 861         ns_os_adjustnofile();
 862         (void)isc_resource_getlimit(isc_resource_openfiles,
 863                                     &ns_g_initopenfiles);
 864         if (old_openfiles != ns_g_initopenfiles) {
 865                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 866                               NS_LOGMODULE_MAIN, ISC_LOG_NOTICE,
 867                               "adjusted limit on open files from "
 868                               "%" ISC_PRINT_QUADFORMAT "u to "
 869                               "%" ISC_PRINT_QUADFORMAT "u",
 870                               old_openfiles, ns_g_initopenfiles);
 871         }
 872
 873         /*
 874          * If the named configuration filename is relative, prepend the current
 875          * directory's name before possibly changing to another directory.
 876          */
 877         if (! isc_file_isabsolute(ns_g_conffile)) {
 878                 result = isc_file_absolutepath(ns_g_conffile,
 879                                                absolute_conffile,
 880                                                sizeof(absolute_conffile));
 881                 if (result != ISC_R_SUCCESS)
 882                         ns_main_earlyfatal("could not construct absolute path "
 883                                            "of configuration file: %s",
 884                                            isc_result_totext(result));
 885                 ns_g_conffile = absolute_conffile;
 886         }
 887
 888         /*
 889          * Record the server's startup time.
 890          */
 891         result = isc_time_now(&ns_g_boottime);
 892         if (result != ISC_R_SUCCESS)
 893                 ns_main_earlyfatal("isc_time_now() failed: %s",
 894                                    isc_result_totext(result));
 895
 896         result = create_managers();
 897         if (result != ISC_R_SUCCESS)
 898                 ns_main_earlyfatal("create_managers() failed: %s",
 899                                    isc_result_totext(result));
 900
 901         ns_builtin_init();
 902
 903         /*
 904          * Add calls to register sdb drivers here.
 905          */
 906         /* xxdb_init(); */
 907
 908 #ifdef ISC_DLZ_DLOPEN
 909         /*
 910          * Register the DLZ "dlopen" driver.
 911          */
 912         result = dlz_dlopen_init(ns_g_mctx);
 913         if (result != ISC_R_SUCCESS)
 914                 ns_main_earlyfatal("dlz_dlopen_init() failed: %s",
 915                                    isc_result_totext(result));
 916 #endif
 917
 918 #if CONTRIB_DLZ
 919         /*
 920          * Register any other contributed DLZ drivers.
 921          */
 922         result = dlz_drivers_init();
 923         if (result != ISC_R_SUCCESS)
 924                 ns_main_earlyfatal("dlz_drivers_init() failed: %s",
 925                                    isc_result_totext(result));
 926 #endif
 927
 928         ns_server_create(ns_g_mctx, &ns_g_server);
 929 }
 930
 931 static void
 932 cleanup(void) {
 933         destroy_managers();
 934
 935         ns_server_destroy(&ns_g_server);
 936
 937         ns_builtin_deinit();
 938
 939         /*
 940          * Add calls to unregister sdb drivers here.
 941          */
 942         /* xxdb_clear(); */
 943
 944 #ifdef CONTRIB_DLZ
 945         /*
 946          * Unregister contributed DLZ drivers.
 947          */
 948         dlz_drivers_clear();
 949 #endif
 950 #ifdef ISC_DLZ_DLOPEN
 951         /*
 952          * Unregister "dlopen" DLZ driver.
 953          */
 954         dlz_dlopen_clear();
 955 #endif
 956
 957         dns_name_destroy();
 958
 959         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 960                       ISC_LOG_NOTICE, "exiting");
 961         ns_log_shutdown();
 962 }
 963
 964 static char *memstats = NULL;
 965
 966 void
 967 ns_main_setmemstats(const char *filename) {
 968         /*
 969          * Caller has to ensure locking.
 970          */
 971
 972         if (memstats != NULL) {
 973                 free(memstats);
 974                 memstats = NULL;
 975         }
 976         if (filename == NULL)
 977                 return;
 978         memstats = malloc(strlen(filename) + 1);
 979         if (memstats)
 980                 strcpy(memstats, filename);
 981 }
 982
 983 #ifdef HAVE_LIBSCF
 984 /*
 985  * Get FMRI for the named process.
 986  */
 987 isc_result_t
 988 ns_smf_get_instance(char **ins_name, int debug, isc_mem_t *mctx) {
 989         scf_handle_t *h = NULL;
 990         int namelen;
 991         char *instance;
 992
 993         REQUIRE(ins_name != NULL && *ins_name == NULL);
 994
 995         if ((h = scf_handle_create(SCF_VERSION)) == NULL) {
 996                 if (debug)
 997                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 998                                          "scf_handle_create() failed: %s",
 999                                          scf_strerror(scf_error()));
1000                 return (ISC_R_FAILURE);
1001         }
1002
1003         if (scf_handle_bind(h) == -1) {
1004                 if (debug)
1005                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1006                                          "scf_handle_bind() failed: %s",
1007                                          scf_strerror(scf_error()));
1008                 scf_handle_destroy(h);
1009                 return (ISC_R_FAILURE);
1010         }
1011
1012         if ((namelen = scf_myname(h, NULL, 0)) == -1) {
1013                 if (debug)
1014                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1015                                          "scf_myname() failed: %s",
1016                                          scf_strerror(scf_error()));
1017                 scf_handle_destroy(h);
1018                 return (ISC_R_FAILURE);
1019         }
1020
1021         if ((instance = isc_mem_allocate(mctx, namelen + 1)) == NULL) {
1022                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1023                                  "ns_smf_get_instance memory "
1024                                  "allocation failed: %s",
1025                                  isc_result_totext(ISC_R_NOMEMORY));
1026                 scf_handle_destroy(h);
1027                 return (ISC_R_FAILURE);
1028         }
1029
1030         if (scf_myname(h, instance, namelen + 1) == -1) {
1031                 if (debug)
1032                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1033                                          "scf_myname() failed: %s",
1034                                          scf_strerror(scf_error()));
1035                 scf_handle_destroy(h);
1036                 isc_mem_free(mctx, instance);
1037                 return (ISC_R_FAILURE);
1038         }
1039
1040         scf_handle_destroy(h);
1041         *ins_name = instance;
1042         return (ISC_R_SUCCESS);
1043 }
1044 #endif /* HAVE_LIBSCF */
1045
1046 int
1047 main(int argc, char *argv[]) {
1048         isc_result_t result;
1049 #ifdef HAVE_LIBSCF
1050         char *instance = NULL;
1051 #endif
1052
1053         /*
1054          * Record version in core image.
1055          * strings named.core | grep "named version:"
1056          */
1057         strlcat(version,
1058 #if defined(NO_VERSION_DATE) || !defined(__DATE__)
1059                 "named version: BIND " VERSION " <" SRCID ">",
1060 #else
1061                 "named version: BIND " VERSION " <" SRCID "> (" __DATE__ ")",
1062 #endif
1063                 sizeof(version));
1064         result = isc_file_progname(*argv, program_name, sizeof(program_name));
1065         if (result != ISC_R_SUCCESS)
1066                 ns_main_earlyfatal("program name too long");
1067
1068         if (strcmp(program_name, "lwresd") == 0)
1069                 ns_g_lwresdonly = ISC_TRUE;
1070
1071         if (result != ISC_R_SUCCESS)
1072                 ns_main_earlyfatal("failed to build internal symbol table");
1073
1074         isc_assertion_setcallback(assertion_failed);
1075         isc_error_setfatal(library_fatal_error);
1076         isc_error_setunexpected(library_unexpected_error);
1077
1078         ns_os_init(program_name);
1079
1080         dns_result_register();
1081         dst_result_register();
1082         isccc_result_register();
1083
1084         parse_command_line(argc, argv);
1085
1086         /*
1087          * Warn about common configuration error.
1088          */
1089         if (ns_g_chrootdir != NULL) {
1090                 int len = strlen(ns_g_chrootdir);
1091                 if (strncmp(ns_g_chrootdir, ns_g_conffile, len) == 0 &&
1092                     (ns_g_conffile[len] == '/' || ns_g_conffile[len] == '\\'))
1093                         ns_main_earlywarning("config filename (-c %s) contains "
1094                                              "chroot path (-t %s)",
1095                                              ns_g_conffile, ns_g_chrootdir);
1096         }
1097
1098         result = isc_mem_create(0, 0, &ns_g_mctx);
1099         if (result != ISC_R_SUCCESS)
1100                 ns_main_earlyfatal("isc_mem_create() failed: %s",
1101                                    isc_result_totext(result));
1102         isc_mem_setname(ns_g_mctx, "main", NULL);
1103
1104         setup();
1105
1106         /*
1107          * Start things running and then wait for a shutdown request
1108          * or reload.
1109          */
1110         do {
1111                 result = isc_app_run();
1112
1113                 if (result == ISC_R_RELOAD) {
1114                         ns_server_reloadwanted(ns_g_server);
1115                 } else if (result != ISC_R_SUCCESS) {
1116                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1117                                          "isc_app_run(): %s",
1118                                          isc_result_totext(result));
1119                         /*
1120                          * Force exit.
1121                          */
1122                         result = ISC_R_SUCCESS;
1123                 }
1124         } while (result != ISC_R_SUCCESS);
1125
1126 #ifdef HAVE_LIBSCF
1127         if (ns_smf_want_disable == 1) {
1128                 result = ns_smf_get_instance(&instance, 1, ns_g_mctx);
1129                 if (result == ISC_R_SUCCESS && instance != NULL) {
1130                         if (smf_disable_instance(instance, 0) != 0)
1131                                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1132                                                  "smf_disable_instance() "
1133                                                  "failed for %s : %s",
1134                                                  instance,
1135                                                  scf_strerror(scf_error()));
1136                 }
1137                 if (instance != NULL)
1138                         isc_mem_free(ns_g_mctx, instance);
1139         }
1140 #endif /* HAVE_LIBSCF */
1141
1142         cleanup();
1143
1144         if (want_stats) {
1145                 isc_mem_stats(ns_g_mctx, stdout);
1146                 isc_mutex_stats(stdout);
1147         }
1148
1149         if (ns_g_memstatistics && memstats != NULL) {
1150                 FILE *fp = NULL;
1151                 result = isc_stdio_open(memstats, "w", &fp);
1152                 if (result == ISC_R_SUCCESS) {
1153                         isc_mem_stats(ns_g_mctx, fp);
1154                         isc_mutex_stats(fp);
1155                         isc_stdio_close(fp);
1156                 }
1157         }
1158         isc_mem_destroy(&ns_g_mctx);
1159         isc_mem_checkdestroyed(stderr);
1160
1161         ns_main_setmemstats(NULL);
1162
1163         isc_app_finish();
1164
1165         ns_os_closedevnull();
1166
1167         ns_os_shutdown();
1168
1169         return (0);
1170 }