bin/named/main.c

	main.c revision 15a44745412679c30a6d022733925af70a38b715
/*
 * 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.
 */

/* $Id: main.c,v 1.75 2000/07/27 09:37:00 tale Exp $ */

#include <config.h>

#include <stdlib.h>
#include <string.h>

#include <isc/app.h>
#include <isc/commandline.h>
#include <isc/entropy.h>
#include <isc/os.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <isc/util.h>

#include <dns/dispatch.h>
#include <dst/result.h>
#include <dns/view.h>

/*
 * Defining NS_MAIN provides storage declaratons (rather than extern)
 * for variables in named/globals.h.
 */
#define NS_MAIN 1

#include <named/globals.h>  /* Explicit, though named/log.h includes it. */
#include <named/interfacemgr.h>
#include <named/log.h>
#include <named/omapi.h>
#include <named/os.h>
#include <named/server.h>
#include <named/lwresd.h>
#include <named/main.h>

static isc_boolean_t    want_stats = ISC_FALSE;
static isc_boolean_t    lwresd_only = ISC_FALSE;
static const 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(const char *file, int line, isc_assertiontype_t type,
         const 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(const char *file, int line, const 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(const char *file, int line, const 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
lwresd_usage(void) {
    fprintf(stderr,
        "usage: lwresd [-C conffile] [-d debuglevel] "
        "[-f|-g] [-n number_of_cpus]\n"
        "              [-p listen-port] [-P query-port] [-s] "
        "[-t chrootdir] [-u username] [-i pidfile]\n");
}

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_lwresd_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:fgi:n:p:P:st:u:")) !=
           -1) {
        switch (ch) {
        case 'C':
            lwresd_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 'i':
            lwresd_g_defaultpidfile = isc_commandline_argument;
            break;
        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 'P':
            port = atoi(isc_commandline_argument);
            if (port < 1 || port > 65535)
                ns_main_earlyfatal("port '%s' out of range",
                           isc_commandline_argument);
            lwresd_g_queryport = 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 '?':
            lwresd_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) {
        lwresd_usage();
        ns_main_earlyfatal("extra command line arguments");
    }
}

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

    s = strrchr(argv[0], '/');
    if (s == NULL)
        s = argv[0];
    else
        s++;
    if (strcmp(s, "lwresd") == 0) {
        lwresd_only = ISC_TRUE;
        parse_lwresd_command_line(argc, argv);
        return;
    }

    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(void) {
    isc_result_t result;

    if (ns_g_cpus == 0)
        ns_g_cpus = isc_os_ncpus();
    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);
    }

    (void)isc_entropy_createfilesource(ns_g_entropy, "/dev/random");

    return (ISC_R_SUCCESS);
}

static void
destroy_managers(void) {
    if (!lwresd_only)
        /*
         * The omapi listeners need to be stopped here so that
         * isc_taskmgr_destroy() won't block on the omapi task.
         */
        ns_omapi_shutdown(ISC_TRUE);

    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);
}

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", ns_g_version);

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

    if (lwresd_only)
        ns_lwresd_create(ns_g_mctx, NULL, &ns_g_lwresd);
    else
        ns_server_create(ns_g_mctx, &ns_g_server);

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

static void
cleanup(void) {
    destroy_managers();

    if (lwresd_only)
        ns_lwresd_destroy(&ns_g_lwresd);
    else
        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(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();

    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);
}