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: 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 = (int)(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         /* PLEASE keep options synchronized when main is hooked! */
 419         isc_commandline_errprint = ISC_FALSE;
 420         while ((ch = isc_commandline_parse(argc, argv,
 421                                            "46c:C:d:E:fFgi:lm:n:N:p:P:"
 422                                            "sS:t:T:u:vVx:")) != -1) {
 423                 switch (ch) {
 424                 case '4':
 425                         if (disable4)
 426                                 ns_main_earlyfatal("cannot specify -4 and -6");
 427                         if (isc_net_probeipv4() != ISC_R_SUCCESS)
 428                                 ns_main_earlyfatal("IPv4 not supported by OS");
 429                         isc_net_disableipv6();
 430                         disable6 = ISC_TRUE;
 431                         break;
 432                 case '6':
 433                         if (disable6)
 434                                 ns_main_earlyfatal("cannot specify -4 and -6");
 435                         if (isc_net_probeipv6() != ISC_R_SUCCESS)
 436                                 ns_main_earlyfatal("IPv6 not supported by OS");
 437                         isc_net_disableipv4();
 438                         disable4 = ISC_TRUE;
 439                         break;
 440                 case 'c':
 441                         ns_g_conffile = isc_commandline_argument;
 442                         lwresd_g_conffile = isc_commandline_argument;
 443                         if (lwresd_g_useresolvconf)
 444                                 ns_main_earlyfatal("cannot specify -c and -C");
 445                         ns_g_conffileset = ISC_TRUE;
 446                         break;
 447                 case 'C':
 448                         lwresd_g_resolvconffile = isc_commandline_argument;
 449                         if (ns_g_conffileset)
 450                                 ns_main_earlyfatal("cannot specify -c and -C");
 451                         lwresd_g_useresolvconf = ISC_TRUE;
 452                         break;
 453                 case 'd':
 454                         ns_g_debuglevel = parse_int(isc_commandline_argument,
 455                                                     "debug level");
 456                         break;
 457                 case 'E':
 458                         ns_g_engine = isc_commandline_argument;
 459                         break;
 460                 case 'f':
 461                         ns_g_foreground = ISC_TRUE;
 462                         break;
 463                 case 'g':
 464                         ns_g_foreground = ISC_TRUE;
 465                         ns_g_logstderr = ISC_TRUE;
 466                         break;
 467                 /* XXXBEW -i should be removed */
 468                 case 'i':
 469                         lwresd_g_defaultpidfile = isc_commandline_argument;
 470                         break;
 471                 case 'l':
 472                         ns_g_lwresdonly = ISC_TRUE;
 473                         break;
 474                 case 'm':
 475                         set_flags(isc_commandline_argument, mem_debug_flags,
 476                                   &isc_mem_debugging);
 477                         break;
 478                 case 'N': /* Deprecated. */
 479                 case 'n':
 480                         ns_g_cpus = parse_int(isc_commandline_argument,
 481                                               "number of cpus");
 482                         if (ns_g_cpus == 0)
 483                                 ns_g_cpus = 1;
 484                         break;
 485                 case 'p':
 486                         port = parse_int(isc_commandline_argument, "port");
 487                         if (port < 1 || port > 65535)
 488                                 ns_main_earlyfatal("port '%s' out of range",
 489                                                    isc_commandline_argument);
 490                         ns_g_port = port;
 491                         break;
 492                 /* XXXBEW Should -P be removed? */
 493                 case 'P':
 494                         port = parse_int(isc_commandline_argument, "port");
 495                         if (port < 1 || port > 65535)
 496                                 ns_main_earlyfatal("port '%s' out of range",
 497                                                    isc_commandline_argument);
 498                         lwresd_g_listenport = port;
 499                         break;
 500                 case 's':
 501                         /* XXXRTH temporary syntax */
 502                         want_stats = ISC_TRUE;
 503                         break;
 504                 case 'S':
 505                         maxsocks = parse_int(isc_commandline_argument,
 506                                              "max number of sockets");
 507                         break;
 508                 case 't':
 509                         /* XXXJAB should we make a copy? */
 510                         ns_g_chrootdir = isc_commandline_argument;
 511                         break;
 512                 case 'T':       /* NOT DOCUMENTED */
 513                         /*
 514                          * clienttest: make clients single shot with their
 515                          *             own memory context.
 516                          */
 517                         if (!strcmp(isc_commandline_argument, "clienttest"))
 518                                 ns_g_clienttest = ISC_TRUE;
 519                         else if (!strcmp(isc_commandline_argument, "nosoa"))
 520                                 ns_g_nosoa = ISC_TRUE;
 521                         else if (!strcmp(isc_commandline_argument, "noaa"))
 522                                 ns_g_noaa = ISC_TRUE;
 523                         else if (!strcmp(isc_commandline_argument, "maxudp512"))
 524                                 maxudp = 512;
 525                         else if (!strcmp(isc_commandline_argument, "maxudp1460"))
 526                                 maxudp = 1460;
 527                         else if (!strcmp(isc_commandline_argument, "nosyslog"))
 528                                 ns_g_nosyslog = ISC_TRUE;
 529                         else if (!strcmp(isc_commandline_argument, "nonearest"))
 530                                 ns_g_nonearest = ISC_TRUE;
 531                         else
 532                                 fprintf(stderr, "unknown -T flag '%s\n",
 533                                         isc_commandline_argument);
 534                         break;
 535                 case 'u':
 536                         ns_g_username = isc_commandline_argument;
 537                         break;
 538                 case 'v':
 539                         printf("%s %s", ns_g_product, ns_g_version);
 540                         if (*ns_g_description != 0)
 541                                 printf(" %s", ns_g_description);
 542                         printf("\n");
 543                         exit(0);
 544                 case 'V':
 545                         printf("%s %s", ns_g_product, ns_g_version);
 546                         if (*ns_g_description != 0)
 547                                 printf(" %s", ns_g_description);
 548                         printf(" <id:%s> built by %s with %s\n", ns_g_srcid,
 549                                ns_g_builder, ns_g_configargs);
 550 #ifdef __clang__
 551                         printf("compiled by CLANG %s\n", __VERSION__);
 552 #else
 553 #if defined(__ICC) || defined(__INTEL_COMPILER)
 554                         printf("compiled by ICC %s\n", __VERSION__);
 555 #else
 556 #ifdef __GNUC__
 557                         printf("compiled by GCC %s\n", __VERSION__);
 558 #endif
 559 #endif
 560 #endif
 561 #ifdef _MSC_VER
 562                         printf("compiled by MSVC %d\n", _MSC_VER);
 563 #endif
 564 #ifdef __SUNPRO_C
 565                         printf("compiled by Solaris Studio %x\n", __SUNPRO_C);
 566 #endif
 567 #ifdef OPENSSL
 568                         printf("using OpenSSL version: %s\n",
 569                                OPENSSL_VERSION_TEXT);
 570 #endif
 571 #ifdef HAVE_LIBXML2
 572                         printf("using libxml2 version: %s\n",
 573                                LIBXML_DOTTED_VERSION);
 574 #endif
 575                         exit(0);
 576                 case 'F':
 577                         /* Reserved for FIPS mode */
 578                         /* FALLTHROUGH */
 579                 case '?':
 580                         usage();
 581                         if (isc_commandline_option == '?')
 582                                 exit(0);
 583                         ns_main_earlyfatal("unknown option '-%c'",
 584                                            isc_commandline_option);
 585                         /* FALLTHROUGH */
 586                 default:
 587                         ns_main_earlyfatal("parsing options returned %d", ch);
 588                 }
 589         }
 590
 591         argc -= isc_commandline_index;
 592         argv += isc_commandline_index;
 593         POST(argv);
 594
 595         if (argc > 0) {
 596                 usage();
 597                 ns_main_earlyfatal("extra command line arguments");
 598         }
 599 }
 600
 601 static isc_result_t
 602 create_managers(void) {
 603         isc_result_t result;
 604         unsigned int socks;
 605
 606 #ifdef ISC_PLATFORM_USETHREADS
 607         if (ns_g_cpus == 0)
 608                 ns_g_cpus = ns_g_cpus_detected;
 609         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
 610                       ISC_LOG_INFO, "found %u CPU%s, using %u worker thread%s",
 611                       ns_g_cpus_detected, ns_g_cpus_detected == 1 ? "" : "s",
 612                       ns_g_cpus, ns_g_cpus == 1 ? "" : "s");
 613 #else
 614         ns_g_cpus = 1;
 615 #endif
 616         result = isc_taskmgr_create(ns_g_mctx, ns_g_cpus, 0, &ns_g_taskmgr);
 617         if (result != ISC_R_SUCCESS) {
 618                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 619                                  "isc_taskmgr_create() failed: %s",
 620                                  isc_result_totext(result));
 621                 return (ISC_R_UNEXPECTED);
 622         }
 623
 624         result = isc_timermgr_create(ns_g_mctx, &ns_g_timermgr);
 625         if (result != ISC_R_SUCCESS) {
 626                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 627                                  "isc_timermgr_create() failed: %s",
 628                                  isc_result_totext(result));
 629                 return (ISC_R_UNEXPECTED);
 630         }
 631
 632         result = isc_socketmgr_create2(ns_g_mctx, &ns_g_socketmgr, maxsocks);
 633         if (result != ISC_R_SUCCESS) {
 634                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 635                                  "isc_socketmgr_create() failed: %s",
 636                                  isc_result_totext(result));
 637                 return (ISC_R_UNEXPECTED);
 638         }
 639         isc__socketmgr_maxudp(ns_g_socketmgr, maxudp);
 640         result = isc_socketmgr_getmaxsockets(ns_g_socketmgr, &socks);
 641         if (result == ISC_R_SUCCESS) {
 642                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 643                               NS_LOGMODULE_SERVER,
 644                               ISC_LOG_INFO, "using up to %u sockets", socks);
 645         }
 646
 647         result = isc_entropy_create(ns_g_mctx, &ns_g_entropy);
 648         if (result != ISC_R_SUCCESS) {
 649                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 650                                  "isc_entropy_create() failed: %s",
 651                                  isc_result_totext(result));
 652                 return (ISC_R_UNEXPECTED);
 653         }
 654
 655         result = isc_hash_create(ns_g_mctx, ns_g_entropy, DNS_NAME_MAXWIRE);
 656         if (result != ISC_R_SUCCESS) {
 657                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 658                                  "isc_hash_create() failed: %s",
 659                                  isc_result_totext(result));
 660                 return (ISC_R_UNEXPECTED);
 661         }
 662
 663         return (ISC_R_SUCCESS);
 664 }
 665
 666 static void
 667 destroy_managers(void) {
 668         ns_lwresd_shutdown();
 669
 670         isc_entropy_detach(&ns_g_entropy);
 671         if (ns_g_fallbackentropy != NULL)
 672                 isc_entropy_detach(&ns_g_fallbackentropy);
 673
 674         /*
 675          * isc_taskmgr_destroy() will block until all tasks have exited,
 676          */
 677         isc_taskmgr_destroy(&ns_g_taskmgr);
 678         isc_timermgr_destroy(&ns_g_timermgr);
 679         isc_socketmgr_destroy(&ns_g_socketmgr);
 680
 681         /*
 682          * isc_hash_destroy() cannot be called as long as a resolver may be
 683          * running.  Calling this after isc_taskmgr_destroy() ensures the
 684          * call is safe.
 685          */
 686         isc_hash_destroy();
 687 }
 688
 689 static void
 690 dump_symboltable() {
 691         int i;
 692         isc_result_t result;
 693         const char *fname;
 694         const void *addr;
 695
 696         if (isc__backtrace_nsymbols == 0)
 697                 return;
 698
 699         if (!isc_log_wouldlog(ns_g_lctx, ISC_LOG_DEBUG(99)))
 700                 return;
 701
 702         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 703                       ISC_LOG_DEBUG(99), "Symbol table:");
 704
 705         for (i = 0, result = ISC_R_SUCCESS; result == ISC_R_SUCCESS; i++) {
 706                 addr = NULL;
 707                 fname = NULL;
 708                 result = isc_backtrace_getsymbolfromindex(i, &addr, &fname);
 709                 if (result == ISC_R_SUCCESS) {
 710                         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 711                                       NS_LOGMODULE_MAIN, ISC_LOG_DEBUG(99),
 712                                       "[%d] %p %s", i, addr, fname);
 713                 }
 714         }
 715 }
 716
 717 static void
 718 setup(void) {
 719         isc_result_t result;
 720         isc_resourcevalue_t old_openfiles;
 721 #ifdef HAVE_LIBSCF
 722         char *instance = NULL;
 723 #endif
 724
 725         /*
 726          * Get the user and group information before changing the root
 727          * directory, so the administrator does not need to keep a copy
 728          * of the user and group databases in the chroot'ed environment.
 729          */
 730         ns_os_inituserinfo(ns_g_username);
 731
 732         /*
 733          * Initialize time conversion information
 734          */
 735         ns_os_tzset();
 736
 737         ns_os_opendevnull();
 738
 739 #ifdef HAVE_LIBSCF
 740         /* Check if named is under smf control, before chroot. */
 741         result = ns_smf_get_instance(&instance, 0, ns_g_mctx);
 742         /* We don't care about instance, just check if we got one. */
 743         if (result == ISC_R_SUCCESS)
 744                 ns_smf_got_instance = 1;
 745         else
 746                 ns_smf_got_instance = 0;
 747         if (instance != NULL)
 748                 isc_mem_free(ns_g_mctx, instance);
 749 #endif /* HAVE_LIBSCF */
 750
 751 #ifdef PATH_RANDOMDEV
 752         /*
 753          * Initialize system's random device as fallback entropy source
 754          * if running chroot'ed.
 755          */
 756         if (ns_g_chrootdir != NULL) {
 757                 result = isc_entropy_create(ns_g_mctx, &ns_g_fallbackentropy);
 758                 if (result != ISC_R_SUCCESS)
 759                         ns_main_earlyfatal("isc_entropy_create() failed: %s",
 760                                            isc_result_totext(result));
 761
 762                 result = isc_entropy_createfilesource(ns_g_fallbackentropy,
 763                                                       PATH_RANDOMDEV);
 764                 if (result != ISC_R_SUCCESS) {
 765                         ns_main_earlywarning("could not open pre-chroot "
 766                                              "entropy source %s: %s",
 767                                              PATH_RANDOMDEV,
 768                                              isc_result_totext(result));
 769                         isc_entropy_detach(&ns_g_fallbackentropy);
 770                 }
 771         }
 772 #endif
 773
 774 #ifdef ISC_PLATFORM_USETHREADS
 775         /*
 776          * Check for the number of cpu's before ns_os_chroot().
 777          */
 778         ns_g_cpus_detected = isc_os_ncpus();
 779 #endif
 780
 781         ns_os_chroot(ns_g_chrootdir);
 782
 783         /*
 784          * For operating systems which have a capability mechanism, now
 785          * is the time to switch to minimal privs and change our user id.
 786          * On traditional UNIX systems, this call will be a no-op, and we
 787          * will change the user ID after reading the config file the first
 788          * time.  (We need to read the config file to know which possibly
 789          * privileged ports to bind() to.)
 790          */
 791         ns_os_minprivs();
 792
 793         result = ns_log_init(ISC_TF(ns_g_username != NULL));
 794         if (result != ISC_R_SUCCESS)
 795                 ns_main_earlyfatal("ns_log_init() failed: %s",
 796                                    isc_result_totext(result));
 797
 798         /*
 799          * Now is the time to daemonize (if we're not running in the
 800          * foreground).  We waited until now because we wanted to get
 801          * a valid logging context setup.  We cannot daemonize any later,
 802          * because calling create_managers() will create threads, which
 803          * would be lost after fork().
 804          */
 805         if (!ns_g_foreground)
 806                 ns_os_daemonize();
 807
 808         /*
 809          * We call isc_app_start() here as some versions of FreeBSD's fork()
 810          * destroys all the signal handling it sets up.
 811          */
 812         result = isc_app_start();
 813         if (result != ISC_R_SUCCESS)
 814                 ns_main_earlyfatal("isc_app_start() failed: %s",
 815                                    isc_result_totext(result));
 816
 817         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 818                       ISC_LOG_NOTICE, "starting %s %s%s", ns_g_product,
 819                       ns_g_version, saved_command_line);
 820
 821         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 822                       ISC_LOG_NOTICE, "built with %s", ns_g_configargs);
 823
 824         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 825                       ISC_LOG_NOTICE,
 826                       "----------------------------------------------------");
 827         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 828                       ISC_LOG_NOTICE,
 829                       "BIND 9 is maintained by Internet Systems Consortium,");
 830         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 831                       ISC_LOG_NOTICE,
 832                       "Inc. (ISC), a non-profit 501(c)(3) public-benefit ");
 833         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 834                       ISC_LOG_NOTICE,
 835                       "corporation.  Support and training for BIND 9 are ");
 836         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 837                       ISC_LOG_NOTICE,
 838                       "available at https://www.isc.org/support");
 839         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 840                       ISC_LOG_NOTICE,
 841                       "----------------------------------------------------");
 842
 843         dump_symboltable();
 844
 845         /*
 846          * Get the initial resource limits.
 847          */
 848         (void)isc_resource_getlimit(isc_resource_stacksize,
 849                                     &ns_g_initstacksize);
 850         (void)isc_resource_getlimit(isc_resource_datasize,
 851                                     &ns_g_initdatasize);
 852         (void)isc_resource_getlimit(isc_resource_coresize,
 853                                     &ns_g_initcoresize);
 854         (void)isc_resource_getlimit(isc_resource_openfiles,
 855                                     &ns_g_initopenfiles);
 856
 857         /*
 858          * System resources cannot effectively be tuned on some systems.
 859          * Raise the limit in such cases for safety.
 860          */
 861         old_openfiles = ns_g_initopenfiles;
 862         ns_os_adjustnofile();
 863         (void)isc_resource_getlimit(isc_resource_openfiles,
 864                                     &ns_g_initopenfiles);
 865         if (old_openfiles != ns_g_initopenfiles) {
 866                 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
 867                               NS_LOGMODULE_MAIN, ISC_LOG_NOTICE,
 868                               "adjusted limit on open files from "
 869                               "%" ISC_PRINT_QUADFORMAT "u to "
 870                               "%" ISC_PRINT_QUADFORMAT "u",
 871                               old_openfiles, ns_g_initopenfiles);
 872         }
 873
 874         /*
 875          * If the named configuration filename is relative, prepend the current
 876          * directory's name before possibly changing to another directory.
 877          */
 878         if (! isc_file_isabsolute(ns_g_conffile)) {
 879                 result = isc_file_absolutepath(ns_g_conffile,
 880                                                absolute_conffile,
 881                                                sizeof(absolute_conffile));
 882                 if (result != ISC_R_SUCCESS)
 883                         ns_main_earlyfatal("could not construct absolute path "
 884                                            "of configuration file: %s",
 885                                            isc_result_totext(result));
 886                 ns_g_conffile = absolute_conffile;
 887         }
 888
 889         /*
 890          * Record the server's startup time.
 891          */
 892         result = isc_time_now(&ns_g_boottime);
 893         if (result != ISC_R_SUCCESS)
 894                 ns_main_earlyfatal("isc_time_now() failed: %s",
 895                                    isc_result_totext(result));
 896
 897         result = create_managers();
 898         if (result != ISC_R_SUCCESS)
 899                 ns_main_earlyfatal("create_managers() failed: %s",
 900                                    isc_result_totext(result));
 901
 902         ns_builtin_init();
 903
 904         /*
 905          * Add calls to register sdb drivers here.
 906          */
 907         /* xxdb_init(); */
 908
 909 #ifdef ISC_DLZ_DLOPEN
 910         /*
 911          * Register the DLZ "dlopen" driver.
 912          */
 913         result = dlz_dlopen_init(ns_g_mctx);
 914         if (result != ISC_R_SUCCESS)
 915                 ns_main_earlyfatal("dlz_dlopen_init() failed: %s",
 916                                    isc_result_totext(result));
 917 #endif
 918
 919 #if CONTRIB_DLZ
 920         /*
 921          * Register any other contributed DLZ drivers.
 922          */
 923         result = dlz_drivers_init();
 924         if (result != ISC_R_SUCCESS)
 925                 ns_main_earlyfatal("dlz_drivers_init() failed: %s",
 926                                    isc_result_totext(result));
 927 #endif
 928
 929         ns_server_create(ns_g_mctx, &ns_g_server);
 930 }
 931
 932 static void
 933 cleanup(void) {
 934         destroy_managers();
 935
 936         ns_server_destroy(&ns_g_server);
 937
 938         ns_builtin_deinit();
 939
 940         /*
 941          * Add calls to unregister sdb drivers here.
 942          */
 943         /* xxdb_clear(); */
 944
 945 #ifdef CONTRIB_DLZ
 946         /*
 947          * Unregister contributed DLZ drivers.
 948          */
 949         dlz_drivers_clear();
 950 #endif
 951 #ifdef ISC_DLZ_DLOPEN
 952         /*
 953          * Unregister "dlopen" DLZ driver.
 954          */
 955         dlz_dlopen_clear();
 956 #endif
 957
 958         dns_name_destroy();
 959
 960         isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
 961                       ISC_LOG_NOTICE, "exiting");
 962         ns_log_shutdown();
 963 }
 964
 965 static char *memstats = NULL;
 966
 967 void
 968 ns_main_setmemstats(const char *filename) {
 969         /*
 970          * Caller has to ensure locking.
 971          */
 972
 973         if (memstats != NULL) {
 974                 free(memstats);
 975                 memstats = NULL;
 976         }
 977         if (filename == NULL)
 978                 return;
 979         memstats = malloc(strlen(filename) + 1);
 980         if (memstats)
 981                 strcpy(memstats, filename);
 982 }
 983
 984 #ifdef HAVE_LIBSCF
 985 /*
 986  * Get FMRI for the named process.
 987  */
 988 isc_result_t
 989 ns_smf_get_instance(char **ins_name, int debug, isc_mem_t *mctx) {
 990         scf_handle_t *h = NULL;
 991         int namelen;
 992         char *instance;
 993
 994         REQUIRE(ins_name != NULL && *ins_name == NULL);
 995
 996         if ((h = scf_handle_create(SCF_VERSION)) == NULL) {
 997                 if (debug)
 998                         UNEXPECTED_ERROR(__FILE__, __LINE__,
 999                                          "scf_handle_create() failed: %s",
1000                                          scf_strerror(scf_error()));
1001                 return (ISC_R_FAILURE);
1002         }
1003
1004         if (scf_handle_bind(h) == -1) {
1005                 if (debug)
1006                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1007                                          "scf_handle_bind() failed: %s",
1008                                          scf_strerror(scf_error()));
1009                 scf_handle_destroy(h);
1010                 return (ISC_R_FAILURE);
1011         }
1012
1013         if ((namelen = scf_myname(h, NULL, 0)) == -1) {
1014                 if (debug)
1015                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1016                                          "scf_myname() failed: %s",
1017                                          scf_strerror(scf_error()));
1018                 scf_handle_destroy(h);
1019                 return (ISC_R_FAILURE);
1020         }
1021
1022         if ((instance = isc_mem_allocate(mctx, namelen + 1)) == NULL) {
1023                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1024                                  "ns_smf_get_instance memory "
1025                                  "allocation failed: %s",
1026                                  isc_result_totext(ISC_R_NOMEMORY));
1027                 scf_handle_destroy(h);
1028                 return (ISC_R_FAILURE);
1029         }
1030
1031         if (scf_myname(h, instance, namelen + 1) == -1) {
1032                 if (debug)
1033                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1034                                          "scf_myname() failed: %s",
1035                                          scf_strerror(scf_error()));
1036                 scf_handle_destroy(h);
1037                 isc_mem_free(mctx, instance);
1038                 return (ISC_R_FAILURE);
1039         }
1040
1041         scf_handle_destroy(h);
1042         *ins_name = instance;
1043         return (ISC_R_SUCCESS);
1044 }
1045 #endif /* HAVE_LIBSCF */
1046
1047 /* main entry point, possibly hooked */
1048
1049 int
1050 main(int argc, char *argv[]) {
1051         isc_result_t result;
1052 #ifdef HAVE_LIBSCF
1053         char *instance = NULL;
1054 #endif
1055
1056         /*
1057          * Record version in core image.
1058          * strings named.core | grep "named version:"
1059          */
1060         strlcat(version,
1061 #if defined(NO_VERSION_DATE) || !defined(__DATE__)
1062                 "named version: BIND " VERSION " <" SRCID ">",
1063 #else
1064                 "named version: BIND " VERSION " <" SRCID "> (" __DATE__ ")",
1065 #endif
1066                 sizeof(version));
1067         result = isc_file_progname(*argv, program_name, sizeof(program_name));
1068         if (result != ISC_R_SUCCESS)
1069                 ns_main_earlyfatal("program name too long");
1070
1071         if (strcmp(program_name, "lwresd") == 0)
1072                 ns_g_lwresdonly = ISC_TRUE;
1073
1074         if (result != ISC_R_SUCCESS)
1075                 ns_main_earlyfatal("failed to build internal symbol table");
1076
1077         isc_assertion_setcallback(assertion_failed);
1078         isc_error_setfatal(library_fatal_error);
1079         isc_error_setunexpected(library_unexpected_error);
1080
1081         ns_os_init(program_name);
1082
1083         dns_result_register();
1084         dst_result_register();
1085         isccc_result_register();
1086
1087         parse_command_line(argc, argv);
1088
1089         /*
1090          * Warn about common configuration error.
1091          */
1092         if (ns_g_chrootdir != NULL) {
1093                 int len = strlen(ns_g_chrootdir);
1094                 if (strncmp(ns_g_chrootdir, ns_g_conffile, len) == 0 &&
1095                     (ns_g_conffile[len] == '/' || ns_g_conffile[len] == '\\'))
1096                         ns_main_earlywarning("config filename (-c %s) contains "
1097                                              "chroot path (-t %s)",
1098                                              ns_g_conffile, ns_g_chrootdir);
1099         }
1100
1101         result = isc_mem_create(0, 0, &ns_g_mctx);
1102         if (result != ISC_R_SUCCESS)
1103                 ns_main_earlyfatal("isc_mem_create() failed: %s",
1104                                    isc_result_totext(result));
1105         isc_mem_setname(ns_g_mctx, "main", NULL);
1106
1107         setup();
1108
1109         /*
1110          * Start things running and then wait for a shutdown request
1111          * or reload.
1112          */
1113         do {
1114                 result = isc_app_run();
1115
1116                 if (result == ISC_R_RELOAD) {
1117                         ns_server_reloadwanted(ns_g_server);
1118                 } else if (result != ISC_R_SUCCESS) {
1119                         UNEXPECTED_ERROR(__FILE__, __LINE__,
1120                                          "isc_app_run(): %s",
1121                                          isc_result_totext(result));
1122                         /*
1123                          * Force exit.
1124                          */
1125                         result = ISC_R_SUCCESS;
1126                 }
1127         } while (result != ISC_R_SUCCESS);
1128
1129 #ifdef HAVE_LIBSCF
1130         if (ns_smf_want_disable == 1) {
1131                 result = ns_smf_get_instance(&instance, 1, ns_g_mctx);
1132                 if (result == ISC_R_SUCCESS && instance != NULL) {
1133                         if (smf_disable_instance(instance, 0) != 0)
1134                                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1135                                                  "smf_disable_instance() "
1136                                                  "failed for %s : %s",
1137                                                  instance,
1138                                                  scf_strerror(scf_error()));
1139                 }
1140                 if (instance != NULL)
1141                         isc_mem_free(ns_g_mctx, instance);
1142         }
1143 #endif /* HAVE_LIBSCF */
1144
1145         cleanup();
1146
1147         if (want_stats) {
1148                 isc_mem_stats(ns_g_mctx, stdout);
1149                 isc_mutex_stats(stdout);
1150         }
1151
1152         if (ns_g_memstatistics && memstats != NULL) {
1153                 FILE *fp = NULL;
1154                 result = isc_stdio_open(memstats, "w", &fp);
1155                 if (result == ISC_R_SUCCESS) {
1156                         isc_mem_stats(ns_g_mctx, fp);
1157                         isc_mutex_stats(fp);
1158                         isc_stdio_close(fp);
1159                 }
1160         }
1161         isc_mem_destroy(&ns_g_mctx);
1162         isc_mem_checkdestroyed(stderr);
1163
1164         ns_main_setmemstats(NULL);
1165
1166         isc_app_finish();
1167
1168         ns_os_closedevnull();
1169
1170         ns_os_shutdown();
1171
1172         return (0);
1173 }