bin/named/server.c

	server.c revision 936f1c128fbfd3b69acca949eae0692d3d918439
/*
 * Copyright (C) 1999  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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdarg.h>

#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/rwlock.h>
#include <isc/mem.h>
#include <isc/task.h>
#include <isc/thread.h>
#include <isc/result.h>
#include <isc/socket.h>
#include <isc/timer.h>
#include <isc/app.h>

#include <dns/confparser.h>
#include <dns/types.h>
#include <dns/result.h>
#include <dns/master.h>
#include <dns/name.h>
#include <dns/fixedname.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/compress.h>
#include <dns/db.h>
#include <dns/dbtable.h>
#include <dns/message.h>
#include <dns/journal.h>
#include <dns/view.h>
#include <dns/zone.h>

#include <named/types.h>
#include <named/globals.h>
#include <named/log.h>
#include <named/rootns.h>
#include <named/server.h>
#include <named/xfrin.h>

#include "../../isc/util.h"     /* XXXRTH */

typedef struct {
    isc_mem_t *     mctx;
    dns_viewlist_t      viewlist;
} ns_load_t;

static isc_task_t *     server_task;
static dns_view_t *     version_view;


static isc_result_t
create_default_view(isc_mem_t *mctx, dns_rdataclass_t rdclass,
            dns_view_t **viewp)
{
    dns_view_t *view;
    dns_db_t *db;
    isc_result_t result;

    REQUIRE(viewp != NULL && *viewp == NULL);

    /*
     * View.
     */
    view = NULL;
    result = dns_view_create(mctx, rdclass, "_default", &view);
    if (result != ISC_R_SUCCESS)
        return (result);

    /*
     * Cache.
     */
    db = NULL;
    result = dns_db_create(mctx, "rbt", dns_rootname, ISC_TRUE,
                   rdclass, 0, NULL, &db);
    if (result != ISC_R_SUCCESS)
        goto cleanup;
    dns_view_setcachedb(view, db);
    dns_db_detach(&db);

    /*
     * Resolver.
     *
     * XXXRTH hardwired number of tasks.  Also, we'll need to
     * see if we are dealing with a shared dispatcher in this view.
     */
    result = dns_view_createresolver(view, ns_g_taskmgr, 16,
                     ns_g_socketmgr, ns_g_timermgr,
                     NULL);
    if (result != ISC_R_SUCCESS)
        goto cleanup;

    /*
     * We have default hints for class IN.
     */
    if (rdclass == dns_rdataclass_in)
        dns_view_sethints(view, ns_g_rootns);

    *viewp = view;

    return (ISC_R_SUCCESS);

 cleanup:
    dns_view_detach(&view);

    return (result);
}

static isc_result_t
load_zone(dns_c_ctx_t *ctx, dns_c_zone_t *czone, dns_c_view_t *cview,
      void *uap)
{
    ns_load_t *lctx;
    dns_view_t *view, *tview, *pview;
    dns_zone_t *zone, *tzone;
    dns_name_t *origin;
    isc_result_t result;
    isc_boolean_t need_load;

    /*
     * Load (or reload) a zone.
     */

    lctx = uap;

    tzone = NULL;
    zone = NULL;
    pview = NULL;
    need_load = ISC_TRUE;

    /*
     * Find the view.
     */
    view = NULL;
    if (cview != NULL) {
        result = dns_viewlist_find(&lctx->viewlist, cview->name,
                       czone->zclass, &view);
        if (result != ISC_R_SUCCESS)
            return (result);
    } else {
        result = dns_viewlist_find(&lctx->viewlist, "_default",
                       czone->zclass, &view);
        if (result == ISC_R_NOTFOUND) {
            /*
             * Create a default view.
             */
            tview = NULL;
            result = create_default_view(ctx->mem, czone->zclass,
                             &tview);
            if (result != ISC_R_SUCCESS)
                return (result);
            dns_view_attach(tview, &view);
            ISC_LIST_APPEND(lctx->viewlist, view, link);
        } else if (result != ISC_R_SUCCESS)
            return (result);
    }

    /*
     * Do we already have a production version of this view?
     */
    RWLOCK(&ns_g_viewlock, isc_rwlocktype_read);
    result = dns_viewlist_find(&ns_g_viewlist, view->name, view->rdclass,
                   &pview);
        RWUNLOCK(&ns_g_viewlock, isc_rwlocktype_read);
    if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
        goto cleanup;

    /*
     * Create a new zone structure and configure it.
     */
    result = dns_zone_create(&zone, lctx->mctx);
    if (result != ISC_R_SUCCESS)
        return (result);
    result = dns_zone_copy(ns_g_lctx, ctx, czone, zone);
    if (result != ISC_R_SUCCESS)
        return (result);

    if (dns_zone_gettype(zone) == dns_zone_hint) {
        INSIST(0);
    } else {
        /*
         * Check for duplicates in the new zone table.
         */
        origin = dns_zone_getorigin(zone);
        result = dns_view_findzone(view, origin, &tzone);
        if (result == ISC_R_SUCCESS) {
            /*
             * We already have this zone!
             */
            result = ISC_R_EXISTS;
            goto cleanup;
        }

        /*
         * Do we have the zone in the production view?
         */
        if (pview != NULL)
            result = dns_view_findzone(pview, origin, &tzone);
        else
            result = ISC_R_NOTFOUND;
        if (result == ISC_R_SUCCESS) {
            /*
             * Yes.
             *
             * If the production zone's configuration is
             * the same as the new zone's, we can use the
             * production zone.
             */
            if (dns_zone_equal(zone, tzone)) {
                result = dns_view_addzone(view, tzone);
                need_load = ISC_FALSE;
            } else
                result = dns_view_addzone(view, zone);
        } else if (result == ISC_R_NOTFOUND) {
            /*
             * This is a new zone.
             */
            result = dns_view_addzone(view, zone);
        }
    }

    if (need_load) {
        /*
         * XXXRTH  What should we do about errors?  We don't
         *         want to fail the whole config file load just
         *     because we couldn't get a zone.
         */
        result = dns_zone_load(zone);
        if (result != ISC_R_SUCCESS) {
            fprintf(stderr, "dns_zone_load failed: %s\n",
                isc_result_totext(result));
        }
    }

 cleanup:
    if (tzone != NULL)
        dns_zone_detach(&tzone);
    if (zone != NULL)
        dns_zone_detach(&zone);
    if (pview != NULL)
        dns_view_detach(&pview);
    if (view != NULL)
        dns_view_detach(&view);

    return (result);
}

static void
load_configuration(const char *filename) {
    isc_result_t result;
    ns_load_t lctx;
    dns_c_cbks_t callbacks;
    dns_c_ctx_t *configctx, *oconfigctx;
    dns_view_t *view, *view_next;
    dns_viewlist_t oviewlist;

    lctx.mctx = ns_g_mctx;
    ISC_LIST_INIT(lctx.viewlist);

    callbacks.zonecbk = load_zone;
    callbacks.zonecbkuap = &lctx;
    callbacks.optscbk = NULL;
    callbacks.optscbkuap = NULL;

    isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
              ISC_LOG_INFO, "loading '%s'", filename);

    configctx = NULL;
    result = dns_c_parse_namedconf(ns_g_lctx,
                       filename, ns_g_mctx, &configctx,
                       &callbacks);
    if (result != ISC_R_SUCCESS) {
#ifdef notyet
        for (view = ISC_LIST_HEAD(lctx.viewlist);
             view != NULL;
             view = view_next) {
            view_next = ISC_LIST_NEXT(view, link);
            ISC_LIST_UNLINK(lctx.viewlist, view, link);
            dns_view_detach(&view);
        }
#endif
        ns_server_fatal(NS_LOGMODULE_SERVER, ISC_FALSE,
                "load of '%s' failed", filename);
    }

    /*
     * XXXRTH  Create default view, if required.
     */

    /*
     * Freeze the views.
     */
    for (view = ISC_LIST_HEAD(lctx.viewlist);
         view != NULL;
         view = ISC_LIST_NEXT(view, link))
        dns_view_freeze(view);

    /*
     * Attach the version view.
     */
    view = NULL;
    dns_view_attach(version_view, &view);
    ISC_LIST_APPEND(lctx.viewlist, view, link);

    /*
     * Load zones.      (???)
     */

#ifdef notyet
    for (view = ISC_LIST_HEAD(lctx.viewlist);
         view != NULL;
         view = view_next) {
        view_next = ISC_LIST_NEXT(view, link);
        dns_view_load(view);
    }
#endif

    /*
     * Put the configuration into production.
     */

    RWLOCK(&ns_g_viewlock, isc_rwlocktype_write);

    oviewlist = ns_g_viewlist;
    ns_g_viewlist = lctx.viewlist;

    oconfigctx = ns_g_confctx;
    ns_g_confctx = configctx;

    RWUNLOCK(&ns_g_viewlock, isc_rwlocktype_write);

    /*
     * Cleanup old configuration.
     */

    for (view = ISC_LIST_HEAD(oviewlist);
         view != NULL;
         view = view_next) {
        view_next = ISC_LIST_NEXT(view, link);
        ISC_LIST_UNLINK(oviewlist, view, link);
        dns_view_detach(&view);
    }

    if (oconfigctx != NULL)
        dns_c_ctx_delete(ns_g_lctx, &oconfigctx);
}

static void
run_server(isc_task_t *task, isc_event_t *event) {

    (void)task;

    isc_event_free(&event);

    load_configuration(ns_g_conffile);

    ns_interfacemgr_scan(ns_g_interfacemgr);

    isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
              ISC_LOG_INFO, "running");
}

static isc_result_t
create_version_view(void) {
    dns_view_t *view;
    dns_zone_t *zone;
    dns_db_t *db;
    dns_name_t *origin;
    dns_result_t result, eresult;
    isc_buffer_t source;
    size_t len;
    int soacount, nscount;
    dns_rdatacallbacks_t callbacks;
    char version_text[1024];

    (void)sprintf(version_text, "version 0 CHAOS TXT \"%s\"\n",
              ns_g_version);

    view = NULL;
    result = dns_view_create(ns_g_mctx, dns_rdataclass_ch, "_version",
                 &view);
    if (result != ISC_R_SUCCESS)
        return (result);

    zone = NULL;
    result = dns_zone_create(&zone, ns_g_mctx);
    if (result != ISC_R_SUCCESS)
        goto cleanup;
    result = dns_zone_setorigin(zone, "bind.");
    if (result != ISC_R_SUCCESS)
        goto cleanup;
    origin = dns_zone_getorigin(zone);

    db = NULL;
    result = dns_db_create(ns_g_mctx, "rbt", origin, ISC_FALSE,
                   view->rdclass, 0, NULL, &db);
    if (result != ISC_R_SUCCESS)
        goto cleanup;

    len = strlen(version_text);
    isc_buffer_init(&source, version_text, len, ISC_BUFFERTYPE_TEXT);
    isc_buffer_add(&source, len);
    dns_rdatacallbacks_init(&callbacks);
    result = dns_db_beginload(db, &callbacks.add, &callbacks.add_private);
    if (result != DNS_R_SUCCESS)
        return (result);
    result = dns_master_loadbuffer(&source, &db->origin, &db->origin,
                       db->rdclass, ISC_FALSE,
                       &soacount, &nscount, &callbacks,
                       ns_g_mctx);
    eresult = dns_db_endload(db, &callbacks.add_private);
    if (result != ISC_R_SUCCESS)
        result = eresult;
    if (result != ISC_R_SUCCESS)
        goto cleanup;

    result = dns_zone_replacedb(zone, db, ISC_FALSE);
    if (result != DNS_R_SUCCESS)
        goto cleanup;

    result = dns_view_addzone(view, zone);
    if (result != DNS_R_SUCCESS)
        goto cleanup;

    dns_view_freeze(view);

    version_view = view;
    view = NULL;

    result = ISC_R_SUCCESS;

 cleanup:
    if (db != NULL)
        dns_db_detach(&db);
    if (zone != NULL)
        dns_zone_detach(&zone);
    if (view != NULL)
        dns_view_detach(&view);

    return (result);
}

static void
shutdown_server(isc_task_t *task, isc_event_t *event) {
    dns_view_t *view, *view_next;

    (void)task;

    isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
              ISC_LOG_INFO, "shutting down");

    RWLOCK(&ns_g_viewlock, isc_rwlocktype_write);

    for (view = ISC_LIST_HEAD(ns_g_viewlist);
         view != NULL;
         view = view_next) {
        view_next = ISC_LIST_NEXT(view, link);
        ISC_LIST_UNLINK(ns_g_viewlist, view, link);
        dns_view_detach(&view);
    }

    /*
     * XXXRTH  Is this the right place to do this?
     */
    dns_c_ctx_delete(ns_g_lctx, &ns_g_confctx);

    RWUNLOCK(&ns_g_viewlock, isc_rwlocktype_write);

    isc_task_detach(&server_task);

    isc_taskpool_destroy(&ns_g_zonetasks);

    dns_view_detach(&version_view);

    ns_rootns_destroy();

    isc_event_free(&event);
}

isc_result_t
ns_server_init(void) {
    isc_result_t result;

    /*
     * Setup default root server hints.
     */
    result = ns_rootns_init();
    if (result != ISC_R_SUCCESS)
        return (result);

    result = create_version_view();
    if (result != ISC_R_SUCCESS)
        return (result);

    result =  isc_taskpool_create(ns_g_taskmgr, ns_g_mctx, 8 /* XXX */,
                      0, &ns_g_zonetasks);
    if (result != ISC_R_SUCCESS)
        return (result);

    /*
     * Setup the server task, which is responsible for coordinating
     * startup and shutdown of the server.
     */
    result = isc_task_create(ns_g_taskmgr, ns_g_mctx, 0, &server_task);
    if (result != ISC_R_SUCCESS)
        goto cleanup_rootns;
    result = isc_task_onshutdown(server_task, shutdown_server, NULL);
    if (result != ISC_R_SUCCESS)
        goto cleanup_task;
    result = isc_app_onrun(ns_g_mctx, server_task, run_server, NULL);
    if (result != ISC_R_SUCCESS)
        goto cleanup_task;

    return (ISC_R_SUCCESS);

    /* XXXRTH  Add taskpool, and version view cleanups. */

 cleanup_task:
    isc_task_detach(&server_task);

 cleanup_rootns:
    ns_rootns_destroy();

    return (result);
}

void
ns_server_fatal(isc_logmodule_t *module, isc_boolean_t want_core,
        const char *format, ...)
{
    va_list args;

    va_start(args, format);
    isc_log_vwrite(ns_g_lctx, NS_LOGCATEGORY_GENERAL, module,
               ISC_LOG_CRITICAL, format, args);
    va_end(args);
    isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
              ISC_LOG_CRITICAL, "exiting (due to fatal error)");

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