contrib/bind9/bin/named/main.c

   1 /*
   2  * Copyright (C) 2004-2011  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 1.180.14.4 2011/11/05 00:45:52 each 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 #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: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
 527                                 fprintf(stderr, "unknown -T flag '%s\n",
 528                                         isc_commandline_argument);
 529                         break;
 530                 case 'u':
 531                         ns_g_username = isc_commandline_argument;
 532                         break;
 533                 case 'v':
 534                         printf("BIND %s\n", ns_g_version);
 535                         exit(0);
 536                 case 'V':
 537                         printf("BIND %s built with %s\n", ns_g_version,
 538                                 ns_g_configargs);
 539 #ifdef OPENSSL
 540                         printf("using OpenSSL version: %s\n",
 541                                OPENSSL_VERSION_TEXT);
 542 #endif
 543 #ifdef HAVE_LIBXML2
 544                         printf("using libxml2 version: %s\n",
 545                                LIBXML_DOTTED_VERSION);
 546 #endif
 547                         exit(0);
 548                 case 'F':
 549                         /* Reserved for FIPS mode */
 550                         /* FALLTHROUGH */
 551                 case '?':
 552                         usage();
 553                         if (isc_commandline_option == '?')
 554                                 exit(0);
 555                         ns_main_earlyfatal("unknown option '-%c'",
 556                                            isc_commandline_option);
 557                         /* FALLTHROUGH */
 558                 default:
 559                         ns_main_earlyfatal("parsing options returned %d", ch);
 560                 }
 561         }
 562
 563         argc -= isc_commandline_index;
 564         argv += isc_commandline_index;
 565         POST(argv);
 566
 567         if (argc > 0) {
 568                 usage();
 569                 ns_main_earlyfatal("extra command line arguments");
 570         }
 571 }
 572
 573 static isc_result_t
 574 create_managers(void) {
 575         isc_result_t result;
 576         unsigned int socks;
 577
 578 #ifdef ISC_PLATFORM_USETHREADS
 579         if (ns_g_cpus == 0)
 580                 ns_g_cpus = ns_g_cpus_detected;
 581         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
 582                       ISC_LOG_INFO, "found %u CPU%s, using %u worker thread%s",
 583                       ns_g_cpus_detected, ns_g_cpus_detected == 1 ? "" : "s",
 584                       ns_g_cpus, ns_g_cpus == 1 ? "" : "s");
 585 #else
 586         ns_g_cpus = 1;
 587 #endif
 588         result = isc_taskmgr_create(ns_g_mctx, ns_g_cpus, 0, &ns_g_taskmgr);
 589         if (result != ISC_R_SUCCESS) {
 590                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 591                                  "isc_taskmgr_create() failed: %s",
 592                                  isc_result_totext(result));
 593                 return (ISC_R_UNEXPECTED);
 594         }
 595
 596         result = isc_timermgr_create(ns_g_mctx, &ns_g_timermgr);
 597         if (result != ISC_R_SUCCESS) {
 598                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 599                                  "isc_timermgr_create() failed: %s",
 600                                  isc_result_totext(result));
 601                 return (ISC_R_UNEXPECTED);
 602         }
 603
 604         result = isc_socketmgr_create2(ns_g_mctx, &ns_g_socketmgr, maxsocks);
 605         if (result != ISC_R_SUCCESS) {
 606                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 607                                  "isc_socketmgr_create() failed: %s",
 608                                  isc_result_totext(result));
 609                 return (ISC_R_UNEXPECTED);
 610         }
 611         isc__socketmgr_maxudp(ns_g_socketmgr, maxudp);
 612         result = isc_socketmgr_getmaxsockets(ns_g_socketmgr, &socks);
 613         if (result == ISC_R_SUCCESS) {
 614                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 615                               NS_LOGMODULE_SERVER,
 616                               ISC_LOG_INFO, "using up to %u sockets", socks);
 617         }
 618
 619         result = isc_entropy_create(ns_g_mctx, &ns_g_entropy);
 620         if (result != ISC_R_SUCCESS) {
 621                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 622                                  "isc_entropy_create() failed: %s",
 623                                  isc_result_totext(result));
 624                 return (ISC_R_UNEXPECTED);
 625         }
 626
 627         result = isc_hash_create(ns_g_mctx, ns_g_entropy, DNS_NAME_MAXWIRE);
 628         if (result != ISC_R_SUCCESS) {
 629                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 630                                  "isc_hash_create() failed: %s",
 631                                  isc_result_totext(result));
 632                 return (ISC_R_UNEXPECTED);
 633         }
 634
 635         return (ISC_R_SUCCESS);
 636 }
 637
 638 static void
 639 destroy_managers(void) {
 640         ns_lwresd_shutdown();
 641
 642         isc_entropy_detach(&ns_g_entropy);
 643         if (ns_g_fallbackentropy != NULL)
 644                 isc_entropy_detach(&ns_g_fallbackentropy);
 645
 646         /*
 647          * isc_taskmgr_destroy() will block until all tasks have exited,
 648          */
 649         isc_taskmgr_destroy(&ns_g_taskmgr);
 650         isc_timermgr_destroy(&ns_g_timermgr);
 651         isc_socketmgr_destroy(&ns_g_socketmgr);
 652
 653         /*
 654          * isc_hash_destroy() cannot be called as long as a resolver may be
 655          * running.  Calling this after isc_taskmgr_destroy() ensures the
 656          * call is safe.
 657          */
 658         isc_hash_destroy();
 659 }
 660
 661 static void
 662 dump_symboltable() {
 663         int i;
 664         isc_result_t result;
 665         const char *fname;
 666         const void *addr;
 667
 668         if (isc__backtrace_nsymbols == 0)
 669                 return;
 670
 671         if (!isc_log_wouldlog(ns_g_lctx, ISC_LOG_DEBUG(99)))
 672                 return;
 673
 674         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 675                       ISC_LOG_DEBUG(99), "Symbol table:");
 676
 677         for (i = 0, result = ISC_R_SUCCESS; result == ISC_R_SUCCESS; i++) {
 678                 addr = NULL;
 679                 fname = NULL;
 680                 result = isc_backtrace_getsymbolfromindex(i, &addr, &fname);
 681                 if (result == ISC_R_SUCCESS) {
 682                         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 683                                       NS_LOGMODULE_MAIN, ISC_LOG_DEBUG(99),
 684                                       "[%d] %p %s", i, addr, fname);
 685                 }
 686         }
 687 }
 688
 689 static void
 690 setup(void) {
 691         isc_result_t result;
 692         isc_resourcevalue_t old_openfiles;
 693 #ifdef HAVE_LIBSCF
 694         char *instance = NULL;
 695 #endif
 696
 697         /*
 698          * Get the user and group information before changing the root
 699          * directory, so the administrator does not need to keep a copy
 700          * of the user and group databases in the chroot'ed environment.
 701          */
 702         ns_os_inituserinfo(ns_g_username);
 703
 704         /*
 705          * Initialize time conversion information
 706          */
 707         ns_os_tzset();
 708
 709         ns_os_opendevnull();
 710
 711 #ifdef HAVE_LIBSCF
 712         /* Check if named is under smf control, before chroot. */
 713         result = ns_smf_get_instance(&instance, 0, ns_g_mctx);
 714         /* We don't care about instance, just check if we got one. */
 715         if (result == ISC_R_SUCCESS)
 716                 ns_smf_got_instance = 1;
 717         else
 718                 ns_smf_got_instance = 0;
 719         if (instance != NULL)
 720                 isc_mem_free(ns_g_mctx, instance);
 721 #endif /* HAVE_LIBSCF */
 722
 723 #ifdef PATH_RANDOMDEV
 724         /*
 725          * Initialize system's random device as fallback entropy source
 726          * if running chroot'ed.
 727          */
 728         if (ns_g_chrootdir != NULL) {
 729                 result = isc_entropy_create(ns_g_mctx, &ns_g_fallbackentropy);
 730                 if (result != ISC_R_SUCCESS)
 731                         ns_main_earlyfatal("isc_entropy_create() failed: %s",
 732                                            isc_result_totext(result));
 733
 734                 result = isc_entropy_createfilesource(ns_g_fallbackentropy,
 735                                                       PATH_RANDOMDEV);
 736                 if (result != ISC_R_SUCCESS) {
 737                         ns_main_earlywarning("could not open pre-chroot "
 738                                              "entropy source %s: %s",
 739                                              PATH_RANDOMDEV,
 740                                              isc_result_totext(result));
 741                         isc_entropy_detach(&ns_g_fallbackentropy);
 742                 }
 743         }
 744 #endif
 745
 746 #ifdef ISC_PLATFORM_USETHREADS
 747         /*
 748          * Check for the number of cpu's before ns_os_chroot().
 749          */
 750         ns_g_cpus_detected = isc_os_ncpus();
 751 #endif
 752
 753         ns_os_chroot(ns_g_chrootdir);
 754
 755         /*
 756          * For operating systems which have a capability mechanism, now
 757          * is the time to switch to minimal privs and change our user id.
 758          * On traditional UNIX systems, this call will be a no-op, and we
 759          * will change the user ID after reading the config file the first
 760          * time.  (We need to read the config file to know which possibly
 761          * privileged ports to bind() to.)
 762          */
 763         ns_os_minprivs();
 764
 765         result = ns_log_init(ISC_TF(ns_g_username != NULL));
 766         if (result != ISC_R_SUCCESS)
 767                 ns_main_earlyfatal("ns_log_init() failed: %s",
 768                                    isc_result_totext(result));
 769
 770         /*
 771          * Now is the time to daemonize (if we're not running in the
 772          * foreground).  We waited until now because we wanted to get
 773          * a valid logging context setup.  We cannot daemonize any later,
 774          * because calling create_managers() will create threads, which
 775          * would be lost after fork().
 776          */
 777         if (!ns_g_foreground)
 778                 ns_os_daemonize();
 779
 780         /*
 781          * We call isc_app_start() here as some versions of FreeBSD's fork()
 782          * destroys all the signal handling it sets up.
 783          */
 784         result = isc_app_start();
 785         if (result != ISC_R_SUCCESS)
 786                 ns_main_earlyfatal("isc_app_start() failed: %s",
 787                                    isc_result_totext(result));
 788
 789         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 790                       ISC_LOG_NOTICE, "starting BIND %s%s", ns_g_version,
 791                       saved_command_line);
 792
 793         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 794                       ISC_LOG_NOTICE, "built with %s", ns_g_configargs);
 795
 796         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 797                       ISC_LOG_NOTICE,
 798                       "----------------------------------------------------");
 799         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 800                       ISC_LOG_NOTICE,
 801                       "BIND 9 is maintained by Internet Systems Consortium,");
 802         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 803                       ISC_LOG_NOTICE,
 804                       "Inc. (ISC), a non-profit 501(c)(3) public-benefit ");
 805         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 806                       ISC_LOG_NOTICE,
 807                       "corporation.  Support and training for BIND 9 are ");
 808         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 809                       ISC_LOG_NOTICE,
 810                       "available at https://www.isc.org/support");
 811         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 812                       ISC_LOG_NOTICE,
 813                       "----------------------------------------------------");
 814
 815         dump_symboltable();
 816
 817         /*
 818          * Get the initial resource limits.
 819          */
 820         (void)isc_resource_getlimit(isc_resource_stacksize,
 821                                     &ns_g_initstacksize);
 822         (void)isc_resource_getlimit(isc_resource_datasize,
 823                                     &ns_g_initdatasize);
 824         (void)isc_resource_getlimit(isc_resource_coresize,
 825                                     &ns_g_initcoresize);
 826         (void)isc_resource_getlimit(isc_resource_openfiles,
 827                                     &ns_g_initopenfiles);
 828
 829         /*
 830          * System resources cannot effectively be tuned on some systems.
 831          * Raise the limit in such cases for safety.
 832          */
 833         old_openfiles = ns_g_initopenfiles;
 834         ns_os_adjustnofile();
 835         (void)isc_resource_getlimit(isc_resource_openfiles,
 836                                     &ns_g_initopenfiles);
 837         if (old_openfiles != ns_g_initopenfiles) {
 838                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 839                               NS_LOGMODULE_MAIN, ISC_LOG_NOTICE,
 840                               "adjusted limit on open files from "
 841                               "%" ISC_PRINT_QUADFORMAT "u to "
 842                               "%" ISC_PRINT_QUADFORMAT "u",
 843                               old_openfiles, ns_g_initopenfiles);
 844         }
 845
 846         /*
 847          * If the named configuration filename is relative, prepend the current
 848          * directory's name before possibly changing to another directory.
 849          */
 850         if (! isc_file_isabsolute(ns_g_conffile)) {
 851                 result = isc_file_absolutepath(ns_g_conffile,
 852                                                absolute_conffile,
 853                                                sizeof(absolute_conffile));
 854                 if (result != ISC_R_SUCCESS)
 855                         ns_main_earlyfatal("could not construct absolute path "
 856                                            "of configuration file: %s",
 857                                            isc_result_totext(result));
 858                 ns_g_conffile = absolute_conffile;
 859         }
 860
 861         /*
 862          * Record the server's startup time.
 863          */
 864         result = isc_time_now(&ns_g_boottime);
 865         if (result != ISC_R_SUCCESS)
 866                 ns_main_earlyfatal("isc_time_now() failed: %s",
 867                                    isc_result_totext(result));
 868
 869         result = create_managers();
 870         if (result != ISC_R_SUCCESS)
 871                 ns_main_earlyfatal("create_managers() failed: %s",
 872                                    isc_result_totext(result));
 873
 874         ns_builtin_init();
 875
 876         /*
 877          * Add calls to register sdb drivers here.
 878          */
 879         /* xxdb_init(); */
 880
 881 #ifdef ISC_DLZ_DLOPEN
 882         /*
 883          * Register the DLZ "dlopen" driver.
 884          */
 885         result = dlz_dlopen_init(ns_g_mctx);
 886         if (result != ISC_R_SUCCESS)
 887                 ns_main_earlyfatal("dlz_dlopen_init() failed: %s",
 888                                    isc_result_totext(result));
 889 #endif
 890
 891 #if CONTRIB_DLZ
 892         /*
 893          * Register any other contributed DLZ drivers.
 894          */
 895         result = dlz_drivers_init();
 896         if (result != ISC_R_SUCCESS)
 897                 ns_main_earlyfatal("dlz_drivers_init() failed: %s",
 898                                    isc_result_totext(result));
 899 #endif
 900
 901         ns_server_create(ns_g_mctx, &ns_g_server);
 902 }
 903
 904 static void
 905 cleanup(void) {
 906         destroy_managers();
 907
 908         ns_server_destroy(&ns_g_server);
 909
 910         ns_builtin_deinit();
 911
 912         /*
 913          * Add calls to unregister sdb drivers here.
 914          */
 915         /* xxdb_clear(); */
 916
 917 #ifdef CONTRIB_DLZ
 918         /*
 919          * Unregister contributed DLZ drivers.
 920          */
 921         dlz_drivers_clear();
 922 #endif
 923 #ifdef ISC_DLZ_DLOPEN
 924         /*
 925          * Unregister "dlopen" DLZ driver.
 926          */
 927         dlz_dlopen_clear();
 928 #endif
 929
 930         dns_name_destroy();
 931
 932         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 933                       ISC_LOG_NOTICE, "exiting");
 934         ns_log_shutdown();
 935 }
 936
 937 static char *memstats = NULL;
 938
 939 void
 940 ns_main_setmemstats(const char *filename) {
 941         /*
 942          * Caller has to ensure locking.
 943          */
 944
 945         if (memstats != NULL) {
 946                 free(memstats);
 947                 memstats = NULL;
 948         }
 949         if (filename == NULL)
 950                 return;
 951         memstats = malloc(strlen(filename) + 1);
 952         if (memstats)
 953                 strcpy(memstats, filename);
 954 }
 955
 956 #ifdef HAVE_LIBSCF
 957 /*
 958  * Get FMRI for the named process.
 959  */
 960 isc_result_t
 961 ns_smf_get_instance(char **ins_name, int debug, isc_mem_t *mctx) {
 962         scf_handle_t *h = NULL;
 963         int namelen;
 964         char *instance;
 965
 966         REQUIRE(ins_name != NULL && *ins_name == NULL);
 967
 968         if ((h = scf_handle_create(SCF_VERSION)) == NULL) {
 969                 if (debug)
 970                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 971                                          "scf_handle_create() failed: %s",
 972                                          scf_strerror(scf_error()));
 973                 return (ISC_R_FAILURE);
 974         }
 975
 976         if (scf_handle_bind(h) == -1) {
 977                 if (debug)
 978                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 979                                          "scf_handle_bind() failed: %s",
 980                                          scf_strerror(scf_error()));
 981                 scf_handle_destroy(h);
 982                 return (ISC_R_FAILURE);
 983         }
 984
 985         if ((namelen = scf_myname(h, NULL, 0)) == -1) {
 986                 if (debug)
 987                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 988                                          "scf_myname() failed: %s",
 989                                          scf_strerror(scf_error()));
 990                 scf_handle_destroy(h);
 991                 return (ISC_R_FAILURE);
 992         }
 993
 994         if ((instance = isc_mem_allocate(mctx, namelen + 1)) == NULL) {
 995                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 996                                  "ns_smf_get_instance memory "
 997                                  "allocation failed: %s",
 998                                  isc_result_totext(ISC_R_NOMEMORY));
 999                 scf_handle_destroy(h);
1000                 return (ISC_R_FAILURE);
1001         }
1002
1003         if (scf_myname(h, instance, namelen + 1) == -1) {
1004                 if (debug)
1005                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1006                                          "scf_myname() failed: %s",
1007                                          scf_strerror(scf_error()));
1008                 scf_handle_destroy(h);
1009                 isc_mem_free(mctx, instance);
1010                 return (ISC_R_FAILURE);
1011         }
1012
1013         scf_handle_destroy(h);
1014         *ins_name = instance;
1015         return (ISC_R_SUCCESS);
1016 }
1017 #endif /* HAVE_LIBSCF */
1018
1019 int
1020 main(int argc, char *argv[]) {
1021         isc_result_t result;
1022 #ifdef HAVE_LIBSCF
1023         char *instance = NULL;
1024 #endif
1025
1026         /*
1027          * Record version in core image.
1028          * strings named.core | grep "named version:"
1029          */
1030         strlcat(version,
1031 #if defined(NO_VERSION_DATE) || !defined(__DATE__)
1032                 "named version: BIND " VERSION,
1033 #else
1034                 "named version: BIND " VERSION " (" __DATE__ ")",
1035 #endif
1036                 sizeof(version));
1037         result = isc_file_progname(*argv, program_name, sizeof(program_name));
1038         if (result != ISC_R_SUCCESS)
1039                 ns_main_earlyfatal("program name too long");
1040
1041         if (strcmp(program_name, "lwresd") == 0)
1042                 ns_g_lwresdonly = ISC_TRUE;
1043
1044         if (result != ISC_R_SUCCESS)
1045                 ns_main_earlyfatal("failed to build internal symbol table");
1046
1047         isc_assertion_setcallback(assertion_failed);
1048         isc_error_setfatal(library_fatal_error);
1049         isc_error_setunexpected(library_unexpected_error);
1050
1051         ns_os_init(program_name);
1052
1053         dns_result_register();
1054         dst_result_register();
1055         isccc_result_register();
1056
1057         parse_command_line(argc, argv);
1058
1059         /*
1060          * Warn about common configuration error.
1061          */
1062         if (ns_g_chrootdir != NULL) {
1063                 int len = strlen(ns_g_chrootdir);
1064                 if (strncmp(ns_g_chrootdir, ns_g_conffile, len) == 0 &&
1065                     (ns_g_conffile[len] == '/' || ns_g_conffile[len] == '\\'))
1066                         ns_main_earlywarning("config filename (-c %s) contains "
1067                                              "chroot path (-t %s)",
1068                                              ns_g_conffile, ns_g_chrootdir);
1069         }
1070
1071         result = isc_mem_create(0, 0, &ns_g_mctx);
1072         if (result != ISC_R_SUCCESS)
1073                 ns_main_earlyfatal("isc_mem_create() failed: %s",
1074                                    isc_result_totext(result));
1075         isc_mem_setname(ns_g_mctx, "main", NULL);
1076
1077         setup();
1078
1079         /*
1080          * Start things running and then wait for a shutdown request
1081          * or reload.
1082          */
1083         do {
1084                 result = isc_app_run();
1085
1086                 if (result == ISC_R_RELOAD) {
1087                         ns_server_reloadwanted(ns_g_server);
1088                 } else if (result != ISC_R_SUCCESS) {
1089                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1090                                          "isc_app_run(): %s",
1091                                          isc_result_totext(result));
1092                         /*
1093                          * Force exit.
1094                          */
1095                         result = ISC_R_SUCCESS;
1096                 }
1097         } while (result != ISC_R_SUCCESS);
1098
1099 #ifdef HAVE_LIBSCF
1100         if (ns_smf_want_disable == 1) {
1101                 result = ns_smf_get_instance(&instance, 1, ns_g_mctx);
1102                 if (result == ISC_R_SUCCESS && instance != NULL) {
1103                         if (smf_disable_instance(instance, 0) != 0)
1104                                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1105                                                  "smf_disable_instance() "
1106                                                  "failed for %s : %s",
1107                                                  instance,
1108                                                  scf_strerror(scf_error()));
1109                 }
1110                 if (instance != NULL)
1111                         isc_mem_free(ns_g_mctx, instance);
1112         }
1113 #endif /* HAVE_LIBSCF */
1114
1115         cleanup();
1116
1117         if (want_stats) {
1118                 isc_mem_stats(ns_g_mctx, stdout);
1119                 isc_mutex_stats(stdout);
1120         }
1121
1122         if (ns_g_memstatistics && memstats != NULL) {
1123                 FILE *fp = NULL;
1124                 result = isc_stdio_open(memstats, "w", &fp);
1125                 if (result == ISC_R_SUCCESS) {
1126                         isc_mem_stats(ns_g_mctx, fp);
1127                         isc_mutex_stats(fp);
1128                         isc_stdio_close(fp);
1129                 }
1130         }
1131         isc_mem_destroy(&ns_g_mctx);
1132         isc_mem_checkdestroyed(stderr);
1133
1134         ns_main_setmemstats(NULL);
1135
1136         isc_app_finish();
1137
1138         ns_os_closedevnull();
1139
1140         ns_os_shutdown();
1141
1142         return (0);
1143 }