/*
 * 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 <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/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/view.h>

#include <named/types.h>
#include <named/globals.h>
#include <named/server.h>

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

static isc_task_t *		server_task;
static dns_db_t *		version_db;
static dns_view_t *		version_view;

static dns_result_t
load(ns_dbinfo_t *dbi, char *view_name) {
	dns_fixedname_t forigin;
	dns_name_t *origin;
	dns_result_t result;
	isc_buffer_t source;
	size_t len;
	dns_view_t *view;

	/*
	 * XXXRTH  View list code will move to its own module soon.
	 */
	RWLOCK(&ns_g_viewlock, isc_rwlocktype_read);
	for (view = ISC_LIST_HEAD(ns_g_viewlist);
	     view != NULL;
	     view = ISC_LIST_NEXT(view, link)) {
		if (strcasecmp(view_name, view->name) == 0) {
			dns_view_attach(view, &dbi->view);
			break;
		}
	}			
	RWUNLOCK(&ns_g_viewlock, isc_rwlocktype_read);
	if (view == NULL)
		return (DNS_R_NOTFOUND);

	len = strlen(dbi->origin);
	isc_buffer_init(&source, dbi->origin, len, ISC_BUFFERTYPE_TEXT);
	isc_buffer_add(&source, len);
	dns_fixedname_init(&forigin);
	origin = dns_fixedname_name(&forigin);
	result = dns_name_fromtext(origin, &source, dns_rootname, ISC_FALSE,
				   NULL);
	if (result != DNS_R_SUCCESS)
		goto view_detach;

	result = dns_db_create(ns_g_mctx, "rbt", origin, dbi->iscache,
			       view->rdclass, 0, NULL, &dbi->db);
	if (result != DNS_R_SUCCESS)
		goto view_detach;

	printf("loading %s (%s)\n", dbi->path, dbi->origin);
	result = dns_db_load(dbi->db, dbi->path);
	if (result != DNS_R_SUCCESS)
		goto db_detach;

	printf("loaded\n");

	if (dbi->iscache) {
		/*
		 * XXXRTH  We must ensure that this is safe, since the
		 *         field is not covered by the view's lock.
		 *
		 *	   We're OK for now, but we'll have to be careful
		 *	   when we start processing the config file.
		 */
		INSIST(view->cachedb == NULL);
		dns_db_attach(dbi->db, &view->cachedb);
	} else if (dns_dbtable_add(view->dbtable, dbi->db) != DNS_R_SUCCESS)
		goto db_detach;

	return (DNS_R_SUCCESS);

 db_detach:
	dns_db_detach(&dbi->db);

 view_detach:
	dns_view_detach(&dbi->view);

	return (result);
}

static isc_result_t
load_version(void) {
	dns_fixedname_t forigin;
	dns_name_t *origin;
	dns_result_t result, eresult;
	isc_buffer_t source;
	size_t len;
	int soacount, nscount;
	dns_rdatacallbacks_t callbacks;
	dns_view_t *view;
	char version_text[1024];

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

	/*
	 * XXXRTH  View list code will move to its own module soon.
	 */
	RWLOCK(&ns_g_viewlock, isc_rwlocktype_read);
	for (view = ISC_LIST_HEAD(ns_g_viewlist);
	     view != NULL;
	     view = ISC_LIST_NEXT(view, link)) {
		if (strcasecmp(view->name, "default/CHAOS") == 0) {
			version_view = NULL;
			dns_view_attach(view, &version_view);
			break;
		}
	}			
	RWUNLOCK(&ns_g_viewlock, isc_rwlocktype_read);
	if (view == NULL)
		return (DNS_R_NOTFOUND);

	len = strlen("bind.");
	isc_buffer_init(&source, "bind.", len, ISC_BUFFERTYPE_TEXT);
	isc_buffer_add(&source, len);
	dns_fixedname_init(&forigin);
	origin = dns_fixedname_name(&forigin);
	result = dns_name_fromtext(origin, &source, dns_rootname, ISC_FALSE,
				   NULL);
	if (result != DNS_R_SUCCESS)
		goto view_detach;

	version_db = NULL;
	result = dns_db_create(ns_g_mctx, "rbt", origin, ISC_FALSE,
			       view->rdclass, 0, NULL, &version_db);
	if (result != DNS_R_SUCCESS)
		goto view_detach;

	dns_rdatacallbacks_init(&callbacks);

	len = strlen(version_text);
	isc_buffer_init(&source, version_text, len, ISC_BUFFERTYPE_TEXT);
	isc_buffer_add(&source, len);

	result = dns_db_beginload(version_db, &callbacks.add, &callbacks.add_private);
	if (result != DNS_R_SUCCESS)
		return (result);
	result = dns_master_loadbuffer(&source, &version_db->origin, &version_db->origin,
				       version_db->rdclass, ISC_FALSE, &soacount,
				       &nscount, &callbacks, version_db->mctx);
	eresult = dns_db_endload(version_db, &callbacks.add_private);
	if (result == ISC_R_SUCCESS)
		result = eresult;
	if (result != ISC_R_SUCCESS)
		goto db_detach;

	if (dns_dbtable_add(version_view->dbtable, version_db) != DNS_R_SUCCESS)
		goto db_detach;

	return (DNS_R_SUCCESS);

 db_detach:
	dns_db_detach(&version_db);

 view_detach:
	dns_view_detach(&version_view);

	return (result);
}

static isc_result_t
load_all(void) {
	isc_result_t result = ISC_R_SUCCESS;
	ns_dbinfo_t *dbi;
	
	result = load_version();
	if (result != ISC_R_SUCCESS)
		return (result);

	for (dbi = ISC_LIST_HEAD(ns_g_dbs);
	     dbi != NULL;
	     dbi = ISC_LIST_NEXT(dbi, link)) {
		result = load(dbi, "default/IN");
		if (result != ISC_R_SUCCESS)
			break;
	}

	return (result);
}

static void
unload_all(void) {
	ns_dbinfo_t *dbi, *dbi_next;
	
	for (dbi = ISC_LIST_HEAD(ns_g_dbs); dbi != NULL; dbi = dbi_next) {
		dbi_next = ISC_LIST_NEXT(dbi, link);
		if (dbi->view != NULL) {
			INSIST(dbi->db != NULL);
			if (dns_db_iszone(dbi->db))
				dns_dbtable_remove(dbi->view->dbtable,
						   dbi->db);
			dns_db_detach(&dbi->db);
			dns_view_detach(&dbi->view);
		}
		ISC_LIST_UNLINK(ns_g_dbs, dbi, link);
		isc_mem_put(ns_g_mctx, dbi, sizeof *dbi);
	}

	if (version_view != NULL) {
		INSIST(version_db != NULL);
		dns_dbtable_remove(version_view->dbtable, version_db);
		dns_db_detach(&version_db);
		dns_view_detach(&version_view);
	}
}

static void
load_configuration(void) {
	isc_result_t result;

	/* 
	 * XXXRTH  loading code below is temporary; it
	 * will be replaced by proper config file processing.
	 */

	result = load_all();
	if (result != ISC_R_SUCCESS) {
		/* XXXRTH */
		printf("load_all(): %s\n", isc_result_totext(result));
	}

	ns_interfacemgr_scan(ns_g_interfacemgr);
}

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

	(void)task;
	printf("server running\n");

	load_configuration();

	isc_event_free(&event);
}

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

	(void)task;

	printf("server shutting down\n");

	RWLOCK(&ns_g_viewlock, isc_rwlocktype_write);
	unload_all();
	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);
	}
	ISC_LIST_INIT(ns_g_viewlist);
	RWUNLOCK(&ns_g_viewlock, isc_rwlocktype_write);
	isc_task_detach(&server_task);

	isc_event_free(&event);
}

isc_result_t
ns_server_init(void) {
	isc_result_t result;
	dns_view_t *view, *view_next;

	/*
	 * XXXRTH  The view management code here will probably move to its
	 *         own module when we start using the config file.
	 */
	view = NULL;
	result = dns_view_create(ns_g_mctx, dns_rdataclass_in, "default/IN",
				 NULL, NULL, &view);
	if (result != ISC_R_SUCCESS)
		goto cleanup_views;
	ISC_LIST_APPEND(ns_g_viewlist, view, link);
	view = NULL;
	result = dns_view_create(ns_g_mctx, dns_rdataclass_ch, "default/CHAOS",
				 NULL, NULL, &view);
	if (result != ISC_R_SUCCESS)
		goto cleanup_views;
	ISC_LIST_APPEND(ns_g_viewlist, view, link);

	result = isc_task_create(ns_g_taskmgr, ns_g_mctx, 0, &server_task);
	if (result != ISC_R_SUCCESS)
		goto cleanup_views;

	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);

 cleanup_task:
	isc_task_detach(&server_task);

 cleanup_views:
	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);
	}

	return (result);
}