/*
 * Copyright (C) 2004-2014  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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: server.h,v 1.118 2012/01/31 23:47:31 tbox Exp $ */

#ifndef NAMED_SERVER_H
#define NAMED_SERVER_H 1

/*! \file */

#include <isc/log.h>
#include <isc/magic.h>
#include <isc/quota.h>
#include <isc/sockaddr.h>
#include <isc/types.h>
#include <isc/xml.h>

#include <dns/acl.h>
#include <dns/types.h>

#include <named/types.h>

#define NS_EVENTCLASS		ISC_EVENTCLASS(0x4E43)
#define NS_EVENT_RELOAD		(NS_EVENTCLASS + 0)
#define NS_EVENT_CLIENTCONTROL	(NS_EVENTCLASS + 1)

/*%
 * Name server state.  Better here than in lots of separate global variables.
 */
struct ns_server {
	unsigned int		magic;
	isc_mem_t *		mctx;

	isc_task_t *		task;

	/* Configurable data. */
	isc_quota_t		xfroutquota;
	isc_quota_t		tcpquota;
	isc_quota_t		recursionquota;
	dns_acl_t		*blackholeacl;
	char *			statsfile;	/*%< Statistics file name */
	char *			dumpfile;	/*%< Dump file name */
	char *			secrootsfile;	/*%< Secroots file name */
	char *			bindkeysfile;	/*%< bind.keys file name */
	char *			recfile;	/*%< Recursive file name */
	isc_boolean_t		version_set;	/*%< User has set version */
	char *			version;	/*%< User-specified version */
	isc_boolean_t		hostname_set;	/*%< User has set hostname */
	char *			hostname;	/*%< User-specified hostname */
	/*% Use hostname for server id */
	isc_boolean_t		server_usehostname;
	char *			server_id;	/*%< User-specified server id */

	/*%
	 * Current ACL environment.  This defines the
	 * current values of the localhost and localnets
	 * ACLs.
	 */
	dns_aclenv_t		aclenv;

	/* Server data structures. */
	dns_loadmgr_t *		loadmgr;
	dns_zonemgr_t *		zonemgr;
	dns_viewlist_t		viewlist;
	ns_interfacemgr_t *	interfacemgr;
	dns_db_t *		in_roothints;
	dns_tkeyctx_t *		tkeyctx;

	isc_timer_t *		interface_timer;
	isc_timer_t *		heartbeat_timer;
	isc_timer_t *		pps_timer;

	isc_uint32_t		interface_interval;
	isc_uint32_t		heartbeat_interval;

	isc_mutex_t		reload_event_lock;
	isc_event_t *		reload_event;

	isc_boolean_t		flushonshutdown;
	isc_boolean_t		log_queries;	/*%< For BIND 8 compatibility */

	ns_cachelist_t		cachelist;	/*%< Possibly shared caches */
	isc_stats_t *		nsstats;	/*%< Server stats */
	dns_stats_t *		rcvquerystats;	/*% Incoming query stats */
	dns_stats_t *		opcodestats;	/*%< Incoming message stats */
	isc_stats_t *		zonestats;	/*% Zone management stats */
	isc_stats_t  *		resolverstats;	/*% Resolver stats */
	isc_stats_t *		sockstats;	/*%< Socket stats */

	ns_controls_t *		controls;	/*%< Control channels */
	unsigned int		dispatchgen;
	ns_dispatchlist_t	dispatches;

	dns_acache_t		*acache;

	ns_statschannellist_t	statschannels;

	dns_tsigkey_t		*sessionkey;
	char			*session_keyfile;
	dns_name_t		*session_keyname;
	unsigned int		session_keyalg;
	isc_uint16_t		session_keybits;
	isc_boolean_t		interface_auto;
	unsigned char		secret[32];	/*%< Source Identity Token */
};

#define NS_SERVER_MAGIC			ISC_MAGIC('S','V','E','R')
#define NS_SERVER_VALID(s)		ISC_MAGIC_VALID(s, NS_SERVER_MAGIC)

/*%
 * Server statistics counters.  Used as isc_statscounter_t values.
 */
enum {
	dns_nsstatscounter_requestv4 = 0,
	dns_nsstatscounter_requestv6 = 1,
	dns_nsstatscounter_edns0in = 2,
	dns_nsstatscounter_badednsver = 3,
	dns_nsstatscounter_tsigin = 4,
	dns_nsstatscounter_sig0in = 5,
	dns_nsstatscounter_invalidsig = 6,
	dns_nsstatscounter_requesttcp = 7,

	dns_nsstatscounter_authrej = 8,
	dns_nsstatscounter_recurserej = 9,
	dns_nsstatscounter_xfrrej = 10,
	dns_nsstatscounter_updaterej = 11,

	dns_nsstatscounter_response = 12,
	dns_nsstatscounter_truncatedresp = 13,
	dns_nsstatscounter_edns0out = 14,
	dns_nsstatscounter_tsigout = 15,
	dns_nsstatscounter_sig0out = 16,

	dns_nsstatscounter_success = 17,
	dns_nsstatscounter_authans = 18,
	dns_nsstatscounter_nonauthans = 19,
	dns_nsstatscounter_referral = 20,
	dns_nsstatscounter_nxrrset = 21,
	dns_nsstatscounter_servfail = 22,
	dns_nsstatscounter_formerr = 23,
	dns_nsstatscounter_nxdomain = 24,
	dns_nsstatscounter_recursion = 25,
	dns_nsstatscounter_duplicate = 26,
	dns_nsstatscounter_dropped = 27,
	dns_nsstatscounter_failure = 28,

	dns_nsstatscounter_xfrdone = 29,

	dns_nsstatscounter_updatereqfwd = 30,
	dns_nsstatscounter_updaterespfwd = 31,
	dns_nsstatscounter_updatefwdfail = 32,
	dns_nsstatscounter_updatedone = 33,
	dns_nsstatscounter_updatefail = 34,
	dns_nsstatscounter_updatebadprereq = 35,

	dns_nsstatscounter_recursclients = 36,

	dns_nsstatscounter_dns64 = 37,

	dns_nsstatscounter_ratedropped = 38,
	dns_nsstatscounter_rateslipped = 39,

	dns_nsstatscounter_rpz_rewrites = 40,

	dns_nsstatscounter_udp = 41,
	dns_nsstatscounter_tcp = 42,

	dns_nsstatscounter_nsidopt = 43,
	dns_nsstatscounter_expireopt = 44,
	dns_nsstatscounter_otheropt = 45,
	dns_nsstatscounter_ecsopt = 46,

#ifdef ISC_PLATFORM_USESIT
	dns_nsstatscounter_sitopt = 47,
	dns_nsstatscounter_sitbadsize = 48,
	dns_nsstatscounter_sitbadtime = 49,
	dns_nsstatscounter_sitnomatch = 50,
	dns_nsstatscounter_sitmatch = 51,
	dns_nsstatscounter_sitnew = 52,

	dns_nsstatscounter_max = 53
#else
	dns_nsstatscounter_max = 47
#endif
};

void
ns_server_create(isc_mem_t *mctx, ns_server_t **serverp);
/*%<
 * Create a server object with default settings.
 * This function either succeeds or causes the program to exit
 * with a fatal error.
 */

void
ns_server_destroy(ns_server_t **serverp);
/*%<
 * Destroy a server object, freeing its memory.
 */

void
ns_server_reloadwanted(ns_server_t *server);
/*%<
 * Inform a server that a reload is wanted.  This function
 * may be called asynchronously, from outside the server's task.
 * If a reload is already scheduled or in progress, the call
 * is ignored.
 */

void
ns_server_scan_interfaces(ns_server_t *server);
/*%<
 * Trigger a interface scan.
 * Must only be called when running under server->task.
 */

void
ns_server_flushonshutdown(ns_server_t *server, isc_boolean_t flush);
/*%<
 * Inform the server that the zones should be flushed to disk on shutdown.
 */

isc_result_t
ns_server_reloadcommand(ns_server_t *server, char *args, isc_buffer_t *text);
/*%<
 * Act on a "reload" command from the command channel.
 */

isc_result_t
ns_server_reconfigcommand(ns_server_t *server, char *args);
/*%<
 * Act on a "reconfig" command from the command channel.
 */

isc_result_t
ns_server_notifycommand(ns_server_t *server, char *args, isc_buffer_t *text);
/*%<
 * Act on a "notify" command from the command channel.
 */

isc_result_t
ns_server_refreshcommand(ns_server_t *server, char *args, isc_buffer_t *text);
/*%<
 * Act on a "refresh" command from the command channel.
 */

isc_result_t
ns_server_retransfercommand(ns_server_t *server, char *args,
			    isc_buffer_t *text);
/*%<
 * Act on a "retransfer" command from the command channel.
 */

isc_result_t
ns_server_togglequerylog(ns_server_t *server, char *args);
/*%<
 * Enable/disable logging of queries.  (Takes "yes" or "no" argument,
 * but can also be used as a toggle for backward comptibility.)
 */

/*%
 * Dump the current statistics to the statistics file.
 */
isc_result_t
ns_server_dumpstats(ns_server_t *server);

/*%
 * Dump the current cache to the dump file.
 */
isc_result_t
ns_server_dumpdb(ns_server_t *server, char *args);

/*%
 * Dump the current security roots to the secroots file.
 */
isc_result_t
ns_server_dumpsecroots(ns_server_t *server, char *args);

/*%
 * Change or increment the server debug level.
 */
isc_result_t
ns_server_setdebuglevel(ns_server_t *server, char *args);

/*%
 * Flush the server's cache(s)
 */
isc_result_t
ns_server_flushcache(ns_server_t *server, char *args);

/*%
 * Flush a particular name from the server's cache.  If 'tree' is false,
 * also flush the name from the ADB and badcache.  If 'tree' is true, also
 * flush all the names under the specified name.
 */
isc_result_t
ns_server_flushnode(ns_server_t *server, char *args, isc_boolean_t tree);

/*%
 * Report the server's status.
 */
isc_result_t
ns_server_status(ns_server_t *server, isc_buffer_t *text);

/*%
 * Report a list of dynamic and static tsig keys, per view.
 */
isc_result_t
ns_server_tsiglist(ns_server_t *server, isc_buffer_t *text);

/*%
 * Delete a specific key (with optional view).
 */
isc_result_t
ns_server_tsigdelete(ns_server_t *server, char *command, isc_buffer_t *text);

/*%
 * Enable or disable updates for a zone.
 */
isc_result_t
ns_server_freeze(ns_server_t *server, isc_boolean_t freeze, char *args,
		 isc_buffer_t *text);

/*%
 * Dump zone updates to disk, optionally removing the journal file
 */
isc_result_t
ns_server_sync(ns_server_t *server, char *args, isc_buffer_t *text);

/*%
 * Update a zone's DNSKEY set from the key repository.  If
 * the command that triggered the call to this function was "sign",
 * then force a full signing of the zone.  If it was "loadkeys",
 * then don't sign the zone; any needed changes to signatures can
 * take place incrementally.
 */
isc_result_t
ns_server_rekey(ns_server_t *server, char *args, isc_buffer_t *text);

/*%
 * Dump the current recursive queries.
 */
isc_result_t
ns_server_dumprecursing(ns_server_t *server);

/*%
 * Maintain a list of dispatches that require reserved ports.
 */
void
ns_add_reserved_dispatch(ns_server_t *server, const isc_sockaddr_t *addr);

/*%
 * Enable or disable dnssec validation.
 */
isc_result_t
ns_server_validation(ns_server_t *server, char *args, isc_buffer_t *text);

/*%
 * Add a zone to a running process
 */
isc_result_t
ns_server_add_zone(ns_server_t *server, char *args, isc_buffer_t *text);

/*%
 * Deletes a zone from a running process
 */
isc_result_t
ns_server_del_zone(ns_server_t *server, char *args, isc_buffer_t *text);

/*%
 * Lists the status of the signing records for a given zone.
 */
isc_result_t
ns_server_signing(ns_server_t *server, char *args, isc_buffer_t *text);

/*%
 * Lists status information for a given zone (e.g., name, type, files,
 * load time, expiry, etc).
 */
isc_result_t
ns_server_zonestatus(ns_server_t *server, char *args, isc_buffer_t *text);

/*%
 * Adds a Negative Trust Anchor (NTA) for a specified name and
 * duration, in a particular view if specified, or in all views.
 */
isc_result_t
ns_server_nta(ns_server_t *server, char *args, isc_buffer_t *text);
#endif /* NAMED_SERVER_H */
