main.c

bind-3.2.

		case 'd':
			ns_g_debuglevel = parse_int(isc_commandline_argument,
						    "debug level");
			break;
		case 'f':
			ns_g_foreground = ISC_TRUE;
			break;
		case 'g':
			ns_g_foreground = ISC_TRUE;
			ns_g_logstderr = ISC_TRUE;
			break;
		/* XXXBEW -i should be removed */
		case 'i':
			lwresd_g_defaultpidfile = isc_commandline_argument;
			break;
		case 'l':
			ns_g_lwresdonly = ISC_TRUE;
			break;
		case 'N': /* Deprecated. */
		case 'n':
			ns_g_cpus = parse_int(isc_commandline_argument,
					      "number of cpus");
			if (ns_g_cpus == 0)
				ns_g_cpus = 1;
			break;
		case 'p':
			port = parse_int(isc_commandline_argument, "port");
			if (port < 1 || port > 65535)
				ns_main_earlyfatal("port '%s' out of range",
						   isc_commandline_argument);
			ns_g_port = port;
			break;
		/* XXXBEW Should -P be removed? */
		case 'P':
			port = parse_int(isc_commandline_argument, "port");
			if (port < 1 || port > 65535)
				ns_main_earlyfatal("port '%s' out of range",
						   isc_commandline_argument);
			lwresd_g_listenport = port;
			break;
		case 's':
			/* XXXRTH temporary syntax */
			want_stats = ISC_TRUE;
			break;
		case 't':
			/* XXXJAB should we make a copy? */
			ns_g_chrootdir = isc_commandline_argument;
			break;
		case 'u':
			ns_g_username = isc_commandline_argument;
			break;
		case 'v':
			printf("BIND %s\n", ns_g_version);
			exit(0);
		case '?':
			usage();
			ns_main_earlyfatal("unknown option '-%c'",
					   isc_commandline_option);
		default:
			ns_main_earlyfatal("parsing options returned %d", ch);
		}
	}

	argc -= isc_commandline_index;
	argv += isc_commandline_index;

	if (argc > 0) {
		usage();
		ns_main_earlyfatal("extra command line arguments");
	}

	
}

static isc_result_t
create_managers(void) {
	isc_result_t result;

#ifdef ISC_PLATFORM_USETHREADS
	if (ns_g_cpus == 0)
		ns_g_cpus = isc_os_ncpus();
#else
	ns_g_cpus = 1;
#endif
	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
		      ISC_LOG_INFO, "using %u CPU%s",
		      ns_g_cpus, ns_g_cpus == 1 ? "" : "s");
	result = isc_taskmgr_create(ns_g_mctx, ns_g_cpus, 0, &ns_g_taskmgr);
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "ns_taskmgr_create() failed: %s",
				 isc_result_totext(result));
		return (ISC_R_UNEXPECTED);
	}

	result = isc_timermgr_create(ns_g_mctx, &ns_g_timermgr);
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "ns_timermgr_create() failed: %s",
				 isc_result_totext(result));
		return (ISC_R_UNEXPECTED);
	}

	result = isc_socketmgr_create(ns_g_mctx, &ns_g_socketmgr);
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "isc_socketmgr_create() failed: %s",
				 isc_result_totext(result));
		return (ISC_R_UNEXPECTED);
	}

	result = isc_entropy_create(ns_g_mctx, &ns_g_entropy);
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "isc_entropy_create() failed: %s",
				 isc_result_totext(result));
		return (ISC_R_UNEXPECTED);
	}

	result = isc_hash_create(ns_g_mctx, ns_g_entropy, DNS_NAME_MAXWIRE);
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "isc_hash_create() failed: %s",
				 isc_result_totext(result));
		return (ISC_R_UNEXPECTED);
	}

	return (ISC_R_SUCCESS);
}

static void
destroy_managers(void) {
	ns_lwresd_shutdown();

	isc_entropy_detach(&ns_g_entropy);
	/*
	 * isc_taskmgr_destroy() will block until all tasks have exited,
	 */
	isc_taskmgr_destroy(&ns_g_taskmgr);
	isc_timermgr_destroy(&ns_g_timermgr);
	isc_socketmgr_destroy(&ns_g_socketmgr);

	/*
	 * isc_hash_destroy() cannot be called as long as a resolver may be
	 * running.  Calling this after isc_taskmgr_destroy() ensures the
	 * call is safe.
	 */
	isc_hash_destroy();
}

static void
setup(void) {
	isc_result_t result;

	/*
	 * Get the user and group information before changing the root
	 * directory, so the administrator does not need to keep a copy
	 * of the user and group databases in the chroot'ed environment.
	 */
	ns_os_inituserinfo(ns_g_username);

	ns_os_chroot(ns_g_chrootdir);

	/*
	 * For operating systems which have a capability mechanism, now
	 * is the time to switch to minimal privs and change our user id.
	 * On traditional UNIX systems, this call will be a no-op, and we
	 * will change the user ID after reading the config file the first
	 * time.  (We need to read the config file to know which possibly
	 * privileged ports to bind() to.)
	 */
	ns_os_minprivs();

	result = ns_log_init(ISC_TF(ns_g_username != NULL));
	if (result != ISC_R_SUCCESS)
		ns_main_earlyfatal("ns_log_init() failed: %s",
				   isc_result_totext(result));

	/*
	 * Now is the time to daemonize (if we're not running in the
	 * foreground).  We waited until now because we wanted to get
	 * a valid logging context setup.  We cannot daemonize any later,
	 * because calling create_managers() will create threads, which
	 * would be lost after fork().
	 */
	if (!ns_g_foreground)
		ns_os_daemonize();

	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
		      ISC_LOG_NOTICE, "starting BIND %s%s", ns_g_version,
		      saved_command_line);

	/*
	 * Get the initial resource limits.
	 */
	(void)isc_resource_getlimit(isc_resource_stacksize,
				    &ns_g_initstacksize);
	(void)isc_resource_getlimit(isc_resource_datasize,
				    &ns_g_initdatasize);
	(void)isc_resource_getlimit(isc_resource_coresize,
				    &ns_g_initcoresize);
	(void)isc_resource_getlimit(isc_resource_openfiles,
				    &ns_g_initopenfiles);

	/*
	 * If the named configuration filename is relative, prepend the current
	 * directory's name before possibly changing to another directory.
	 */
	if (! isc_file_isabsolute(ns_g_conffile)) {
		result = isc_file_absolutepath(ns_g_conffile,
					       absolute_conffile,
					       sizeof(absolute_conffile));
		if (result != ISC_R_SUCCESS)
			ns_main_earlyfatal("could not construct absolute path of "
					   "configuration file: %s", 
					   isc_result_totext(result));
		ns_g_conffile = absolute_conffile;
	}

	result = create_managers();
	if (result != ISC_R_SUCCESS)
		ns_main_earlyfatal("create_managers() failed: %s",
				   isc_result_totext(result));

	/*
	 * Add calls to register sdb drivers here.
	 */
	/* xxdb_init(); */

	ns_server_create(ns_g_mctx, &ns_g_server);
}

static void
cleanup(void) {
	destroy_managers();

	ns_server_destroy(&ns_g_server);

	/*
	 * Add calls to unregister sdb drivers here.
	 */
	/* xxdb_clear(); */

	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_MAIN,
		      ISC_LOG_NOTICE, "exiting");
	ns_log_shutdown();
}

int
main(int argc, char *argv[]) {
	isc_result_t result;

	result = isc_file_progname(*argv, program_name, sizeof(program_name));
	if (result != ISC_R_SUCCESS)
		ns_main_earlyfatal("program name too long");

	if (strcmp(program_name, "lwresd") == 0)
		ns_g_lwresdonly = ISC_TRUE;

	isc_assertion_setcallback(assertion_failed);
	isc_error_setfatal(library_fatal_error);
	isc_error_setunexpected(library_unexpected_error);

	ns_os_init(program_name);

	result = isc_app_start();
	if (result != ISC_R_SUCCESS)
		ns_main_earlyfatal("isc_app_start() failed: %s",
				   isc_result_totext(result));

	result = isc_mem_create(0, 0, &ns_g_mctx);
	if (result != ISC_R_SUCCESS)
		ns_main_earlyfatal("isc_mem_create() failed: %s",
				   isc_result_totext(result));

	dns_result_register();
	dst_result_register();
	isccc_result_register();

	parse_command_line(argc, argv);

	setup();

	/*
	 * Start things running and then wait for a shutdown request
	 * or reload.
	 */
	do {
		result = isc_app_run();

		if (result == ISC_R_RELOAD) {
			ns_server_reloadwanted(ns_g_server);
		} else if (result != ISC_R_SUCCESS) {
			UNEXPECTED_ERROR(__FILE__, __LINE__,
					 "isc_app_run(): %s",
					 isc_result_totext(result));
			/*
			 * Force exit.
			 */
			result = ISC_R_SUCCESS;
		}
	} while (result != ISC_R_SUCCESS);

	cleanup();

	if (want_stats) {
		isc_mem_stats(ns_g_mctx, stdout);
		isc_mutex_stats(stdout);
	}
	isc_mem_destroy(&ns_g_mctx);

	isc_app_finish();

	ns_os_shutdown();

	return (0);
}