bin/named/main.c

	main.c revision 7193a1762e428cfba06907e51fa9e4bce3b5569a
/*
 * Copyright (C) 1999, 2000  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#include <config.h>

#include <errno.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stddef.h>

#include <isc/app.h>
#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/boolean.h>
#include <isc/commandline.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <isc/util.h>

#include <dns/dbtable.h>
#include <dns/tsig.h>
#include <dns/tkey.h>
#include <dns/result.h>

#include <dst/result.h>

#define NS_MAIN 1

#include <named/globals.h>
#include <named/interfacemgr.h>
#include <named/log.h>
#include <named/omapi.h>
#include <named/os.h>
#include <named/server.h>
#include <named/main.h>

static isc_boolean_t            want_stats = ISC_FALSE;
static char *               program_name = "named";

void
ns_main_earlyfatal(const char *format, ...) {
    va_list args;

    va_start(args, format);
    if (ns_g_lctx != NULL) {
        isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                   NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
                   format, args);
        isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                   NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
                   "exiting (due to early fatal error)");
    } else {
        fprintf(stderr, "%s: ", program_name);
        vfprintf(stderr, format, args);
        fprintf(stderr, "\n");
        fflush(stderr);
    }
    va_end(args);

    exit(1);
}

static void
assertion_failed(char *file, int line, isc_assertiontype_t type, char *cond) {
    /*
     * Handle assertion failures.
     */

    if (ns_g_lctx != NULL) {
        /*
         * Reset the assetion callback in case it is the log
         * routines causing the assertion.
         */
        isc_assertion_setcallback(NULL);

        isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                  NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
                  "%s:%d: %s(%s) failed", file, line,
                  isc_assertion_typetotext(type), cond);
        isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                   NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
                   "exiting (due assertion failure)");
    } else {
        fprintf(stderr, "%s:%d: %s(%s) failed\n",
            file, line, isc_assertion_typetotext(type), cond);
        fflush(stderr);
    }

    if (ns_g_coreok)
        abort();
    exit(1);
}

static void
library_fatal_error(char *file, int line, char *format, va_list args) {
    /*
     * Handle isc_error_fatal() calls from our libraries.
     */

    if (ns_g_lctx != NULL) {
        /*
         * Reset the error callback in case it is the log
         * routines causing the assertion.
         */
        isc_error_setfatal(NULL);

        isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                  NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
                  "%s:%d: fatal error:", file, line);
        isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                   NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
                   format, args);
        isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                  NS_LOGMODULE_MAIN, ISC_LOG_CRITICAL,
                  "exiting (due to fatal error in library)");
    } else {
        fprintf(stderr, "%s:%d: fatal error: ", file, line);
        vfprintf(stderr, format, args);
        fprintf(stderr, "\n");
        fflush(stderr);
    }

    if (ns_g_coreok)
        abort();
    exit(1);
}

static void
library_unexpected_error(char *file, int line, char *format, va_list args) {
    /*
     * Handle isc_error_unexpected() calls from our libraries.
     */

    if (ns_g_lctx != NULL) {
        isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                  NS_LOGMODULE_MAIN, ISC_LOG_ERROR,
                  "%s:%d: unexpected error:", file, line);
        isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                   NS_LOGMODULE_MAIN, ISC_LOG_ERROR,
                   format, args);
    } else {
        fprintf(stderr, "%s:%d: fatal error: ", file, line);
        vfprintf(stderr, format, args);
        fprintf(stderr, "\n");
        fflush(stderr);
    }
}

static void
usage(void) {
    fprintf(stderr,
        "usage: named [-c conffile] [-d debuglevel] "
        "[-f|-g] [-n number_of_cpus]\n"
        "             [-p port] [-s] [-t chrootdir] [-u username]\n");
}

static void
parse_command_line(int argc, char *argv[]) {
    int ch;
    unsigned int port;

    isc_commandline_errprint = ISC_FALSE;
    while ((ch = isc_commandline_parse(argc, argv,
                       "c:d:fgn:N:p:st:u:x:")) !=
           -1) {
        switch (ch) {
        case 'c':
            ns_g_conffile = isc_commandline_argument;
            break;
        case 'd':
            ns_g_debuglevel = atoi(isc_commandline_argument);
            break;
        case 'f':
            ns_g_foreground = ISC_TRUE;
            break;
        case 'g':
            ns_g_foreground = ISC_TRUE;
            ns_g_logstderr = ISC_TRUE;
            break;
        case 'N': /* Deprecated. */
        case 'n':
            ns_g_cpus = atoi(isc_commandline_argument);
            if (ns_g_cpus == 0)
                ns_g_cpus = 1;
            break;
        case 'p':
            port = atoi(isc_commandline_argument);
            if (port < 1 || port > 65535)
                ns_main_earlyfatal("port '%s' out of range",
                           isc_commandline_argument);
            ns_g_port = 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 'x':
            /* XXXRTH temporary syntax */
            ns_g_cachefile = isc_commandline_argument;
            break;
        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() {
    isc_result_t result;

    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);
    }

    return (ISC_R_SUCCESS);
}

static void
destroy_managers(void) {
    if (ns_g_omapimgr != NULL)
        omapi_listener_shutdown(ns_g_omapimgr);
    else
        omapi_lib_destroy();

    /*
     * 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);
}

static void
setup() {
    isc_result_t result;

    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(ns_g_username);

    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", ns_g_version);

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

    ns_server_create(ns_g_mctx, &ns_g_server);

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

    result = ns_omapi_listen(&ns_g_omapimgr);
    if (result == ISC_R_SUCCESS)
        isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                  NS_LOGMODULE_MAIN, ISC_LOG_DEBUG(3),
                  "OMAPI started");
    else
        isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
                  NS_LOGMODULE_MAIN, ISC_LOG_WARNING,
                  "OMAPI failed to start: %s",
                  isc_result_totext(result));
}

static void
cleanup() {
    destroy_managers();
    ns_server_destroy(&ns_g_server);
    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;

    program_name = argv[0];
    isc_assertion_setcallback(assertion_failed);
    isc_error_setfatal(library_fatal_error);
    isc_error_setunexpected(library_unexpected_error);

    ns_os_init();

    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();

    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_mem_destroy(&ns_g_mctx);

    isc_app_finish();

    ns_os_shutdown();

    return (0);
}