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/*
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 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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 *
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 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
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 */

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/*! \file */
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <limits.h>
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#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
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#include <isc/aes.h>
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#include <isc/app.h>
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#include <isc/base64.h>
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#include <isc/commandline.h>
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#include <isc/dir.h>
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#include <isc/file.h>
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#include <isc/hash.h>
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#include <isc/hex.h>
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#include <isc/hmac.h>
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#include <isc/httpd.h>
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#include <isc/lex.h>
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#include <isc/meminfo.h>
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#include <isc/nonce.h>
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#include <isc/parseint.h>
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#include <isc/platform.h>
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#include <isc/portset.h>
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#include <isc/print.h>
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#include <isc/refcount.h>
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#include <isc/resource.h>
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#include <isc/siphash.h>
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#include <isc/socket.h>
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#include <isc/stat.h>
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#include <isc/stats.h>
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#include <isc/stdio.h>
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#include <isc/string.h>
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#include <isc/task.h>
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#include <isc/timer.h>
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#include <isc/util.h>
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#include <isccfg/grammar.h>
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#include <isccfg/kaspconf.h>
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#include <isccfg/namedconf.h>
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#include <bind9/check.h>
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#include <dns/adb.h>
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#include <dns/badcache.h>
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#include <dns/cache.h>
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#include <dns/catz.h>
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#include <dns/db.h>
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#include <dns/dispatch.h>
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#include <dns/dlz.h>
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#include <dns/dnsrps.h>
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#include <dns/dns64.h>
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#include <dns/dyndb.h>
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#include <dns/events.h>
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#include <dns/forward.h>
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#include <dns/fixedname.h>
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#include <dns/journal.h>
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#include <dns/kasp.h>
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#include <dns/keytable.h>
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#include <dns/keyvalues.h>
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#include <dns/lib.h>
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#include <dns/master.h>
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#include <dns/masterdump.h>
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#include <dns/nta.h>
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#include <dns/order.h>
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#include <dns/peer.h>
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#include <dns/portlist.h>
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#include <dns/private.h>
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#include <dns/rbt.h>
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#include <dns/rdataclass.h>
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#include <dns/rdatalist.h>
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#include <dns/rdataset.h>
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#include <dns/rdatastruct.h>
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#include <dns/resolver.h>
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#include <dns/rootns.h>
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#include <dns/rriterator.h>
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#include <dns/secalg.h>
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#include <dns/soa.h>
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#include <dns/stats.h>
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#include <dns/tkey.h>
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#include <dns/tsig.h>
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#include <dns/ttl.h>
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#include <dns/view.h>
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#include <dns/zone.h>
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#include <dns/zt.h>
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#include <dst/dst.h>
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#include <dst/result.h>
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#include <ns/client.h>
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#include <ns/hooks.h>
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#include <ns/listenlist.h>
#include <ns/interfacemgr.h>

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#include <named/config.h>
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#include <named/control.h>
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#if defined(HAVE_GEOIP2)
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#include <named/geoip.h>
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#endif /* HAVE_GEOIP2 */
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#include <named/log.h>
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#include <named/logconf.h>
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#include <named/main.h>
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#include <named/os.h>
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#include <named/server.h>
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#include <named/statschannel.h>
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#include <named/tkeyconf.h>
#include <named/tsigconf.h>
#include <named/zoneconf.h>
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#ifdef HAVE_LIBSCF
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#include <named/smf_globals.h>
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#include <stdlib.h>
#endif
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#ifdef HAVE_LMDB
#include <lmdb.h>
#define count_newzones count_newzones_db
#define configure_newzones configure_newzones_db
#define dumpzone dumpzone_db
#else  /* HAVE_LMDB */
#define count_newzones count_newzones_file
#define configure_newzones configure_newzones_file
#define dumpzone dumpzone_file
#endif /* HAVE_LMDB */
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#ifndef SIZE_MAX
#define SIZE_MAX ((size_t)-1)
#endif

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#ifndef SIZE_AS_PERCENT
#define SIZE_AS_PERCENT ((size_t)-2)
#endif

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#ifdef TUNE_LARGE
#define RESOLVER_NTASKS 523
#define UDPBUFFERS 32768
#define EXCLBUFFERS 32768
#else
#define RESOLVER_NTASKS 31
#define UDPBUFFERS 1000
#define EXCLBUFFERS 4096
#endif /* TUNE_LARGE */

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#define MAX_TCP_TIMEOUT 65535

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/*%
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 * Check an operation for failure.  Assumes that the function
 * using it has a 'result' variable and a 'cleanup' label.
 */
#define CHECK(op) \
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	do { result = (op);					  \
	       if (result != ISC_R_SUCCESS) goto cleanup;	  \
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	} while (0)

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#define TCHECK(op) \
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	do { tresult = (op);					  \
		if (tresult != ISC_R_SUCCESS) {			  \
			isc_buffer_clear(*text);		  \
			goto cleanup;	 			  \
		}						  \
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	} while (0)

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#define CHECKM(op, msg) \
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	do { result = (op);					  \
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	       if (result != ISC_R_SUCCESS) {			  \
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			isc_log_write(named_g_lctx,		  \
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				      NAMED_LOGCATEGORY_GENERAL,  \
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				      NAMED_LOGMODULE_SERVER,	  \
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				      ISC_LOG_ERROR,		  \
				      "%s: %s", msg,		  \
				      isc_result_totext(result)); \
			goto cleanup;				  \
		}						  \
	} while (0)						  \

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#define CHECKMF(op, msg, file) \
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	do { result = (op);					  \
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	       if (result != ISC_R_SUCCESS) {			  \
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			isc_log_write(named_g_lctx,		  \
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				      NAMED_LOGCATEGORY_GENERAL,  \
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				      NAMED_LOGMODULE_SERVER,	  \
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				      ISC_LOG_ERROR,		  \
				      "%s '%s': %s", msg, file,	  \
				      isc_result_totext(result)); \
			goto cleanup;				  \
		}						  \
	} while (0)						  \

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#define CHECKFATAL(op, msg) \
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	do { result = (op);					  \
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	       if (result != ISC_R_SUCCESS)			  \
			fatal(msg, result);			  \
	} while (0)						  \

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/*%
 * Maximum ADB size for views that share a cache.  Use this limit to suppress
 * the total of memory footprint, which should be the main reason for sharing
 * a cache.  Only effective when a finite max-cache-size is specified.
 * This is currently defined to be 8MB.
 */
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#define MAX_ADB_SIZE_FOR_CACHESHARE	8388608U
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struct named_dispatch {
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	isc_sockaddr_t			addr;
	unsigned int			dispatchgen;
	dns_dispatch_t			*dispatch;
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	ISC_LINK(struct named_dispatch)	link;
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};

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struct named_cache {
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	dns_cache_t			*cache;
	dns_view_t			*primaryview;
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	bool			needflush;
	bool			adbsizeadjusted;
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	dns_rdataclass_t		rdclass;
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	ISC_LINK(named_cache_t)		link;
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};

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struct dumpcontext {
	isc_mem_t			*mctx;
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	bool			dumpcache;
	bool			dumpzones;
	bool			dumpadb;
	bool			dumpbad;
	bool			dumpfail;
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	FILE				*fp;
	ISC_LIST(struct viewlistentry)	viewlist;
	struct viewlistentry		*view;
	struct zonelistentry		*zone;
	dns_dumpctx_t			*mdctx;
	dns_db_t			*db;
	dns_db_t			*cache;
	isc_task_t			*task;
	dns_dbversion_t			*version;
};

struct viewlistentry {
	dns_view_t			*view;
	ISC_LINK(struct viewlistentry)	link;
	ISC_LIST(struct zonelistentry)	zonelist;
};

struct zonelistentry {
	dns_zone_t			*zone;
	ISC_LINK(struct zonelistentry)	link;
};

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/*%
 * Configuration context to retain for each view that allows
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 * new zones to be added at runtime.
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 */
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typedef struct ns_cfgctx {
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	isc_mem_t *			mctx;
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	cfg_parser_t *			conf_parser;
	cfg_parser_t *			add_parser;
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	cfg_obj_t *			config;
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	cfg_obj_t *			vconfig;
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	cfg_obj_t *			nzf_config;
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	cfg_aclconfctx_t *		actx;
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} ns_cfgctx_t;
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/*%
 * A function to write out added-zone configuration to the new_zone_file
 * specified in 'view'. Maybe called by delete_zoneconf().
 */
typedef isc_result_t (*nzfwriter_t)(const cfg_obj_t *config, dns_view_t *view);

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/*%
 * Holds state information for the initial zone loading process.
 * Uses the isc_refcount structure to count the number of views
 * with pending zone loads, dereferencing as each view finishes.
 */
typedef struct {
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		named_server_t *server;
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		bool reconfig;
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		isc_refcount_t refs;
} ns_zoneload_t;

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typedef struct {
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	named_server_t *server;
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} catz_cb_data_t;

typedef struct catz_chgzone_event {
	ISC_EVENT_COMMON(struct catz_chgzone_event);
	dns_catz_entry_t *entry;
	dns_catz_zone_t *origin;
	dns_view_t *view;
	catz_cb_data_t *cbd;
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	bool mod;
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} catz_chgzone_event_t;

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typedef struct {
	unsigned int magic;
#define DZARG_MAGIC		ISC_MAGIC('D', 'z', 'a', 'r')
	isc_buffer_t **text;
	isc_result_t result;
} ns_dzarg_t;

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/*
 * These zones should not leak onto the Internet.
 */
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const char *empty_zones[] = {
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	/* RFC 1918 */
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	"10.IN-ADDR.ARPA",
	"16.172.IN-ADDR.ARPA",
	"17.172.IN-ADDR.ARPA",
	"18.172.IN-ADDR.ARPA",
	"19.172.IN-ADDR.ARPA",
	"20.172.IN-ADDR.ARPA",
	"21.172.IN-ADDR.ARPA",
	"22.172.IN-ADDR.ARPA",
	"23.172.IN-ADDR.ARPA",
	"24.172.IN-ADDR.ARPA",
	"25.172.IN-ADDR.ARPA",
	"26.172.IN-ADDR.ARPA",
	"27.172.IN-ADDR.ARPA",
	"28.172.IN-ADDR.ARPA",
	"29.172.IN-ADDR.ARPA",
	"30.172.IN-ADDR.ARPA",
	"31.172.IN-ADDR.ARPA",
	"168.192.IN-ADDR.ARPA",
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	/* RFC 6598 */
	"64.100.IN-ADDR.ARPA",
	"65.100.IN-ADDR.ARPA",
	"66.100.IN-ADDR.ARPA",
	"67.100.IN-ADDR.ARPA",
	"68.100.IN-ADDR.ARPA",
	"69.100.IN-ADDR.ARPA",
	"70.100.IN-ADDR.ARPA",
	"71.100.IN-ADDR.ARPA",
	"72.100.IN-ADDR.ARPA",
	"73.100.IN-ADDR.ARPA",
	"74.100.IN-ADDR.ARPA",
	"75.100.IN-ADDR.ARPA",
	"76.100.IN-ADDR.ARPA",
	"77.100.IN-ADDR.ARPA",
	"78.100.IN-ADDR.ARPA",
	"79.100.IN-ADDR.ARPA",
	"80.100.IN-ADDR.ARPA",
	"81.100.IN-ADDR.ARPA",
	"82.100.IN-ADDR.ARPA",
	"83.100.IN-ADDR.ARPA",
	"84.100.IN-ADDR.ARPA",
	"85.100.IN-ADDR.ARPA",
	"86.100.IN-ADDR.ARPA",
	"87.100.IN-ADDR.ARPA",
	"88.100.IN-ADDR.ARPA",
	"89.100.IN-ADDR.ARPA",
	"90.100.IN-ADDR.ARPA",
	"91.100.IN-ADDR.ARPA",
	"92.100.IN-ADDR.ARPA",
	"93.100.IN-ADDR.ARPA",
	"94.100.IN-ADDR.ARPA",
	"95.100.IN-ADDR.ARPA",
	"96.100.IN-ADDR.ARPA",
	"97.100.IN-ADDR.ARPA",
	"98.100.IN-ADDR.ARPA",
	"99.100.IN-ADDR.ARPA",
	"100.100.IN-ADDR.ARPA",
	"101.100.IN-ADDR.ARPA",
	"102.100.IN-ADDR.ARPA",
	"103.100.IN-ADDR.ARPA",
	"104.100.IN-ADDR.ARPA",
	"105.100.IN-ADDR.ARPA",
	"106.100.IN-ADDR.ARPA",
	"107.100.IN-ADDR.ARPA",
	"108.100.IN-ADDR.ARPA",
	"109.100.IN-ADDR.ARPA",
	"110.100.IN-ADDR.ARPA",
	"111.100.IN-ADDR.ARPA",
	"112.100.IN-ADDR.ARPA",
	"113.100.IN-ADDR.ARPA",
	"114.100.IN-ADDR.ARPA",
	"115.100.IN-ADDR.ARPA",
	"116.100.IN-ADDR.ARPA",
	"117.100.IN-ADDR.ARPA",
	"118.100.IN-ADDR.ARPA",
	"119.100.IN-ADDR.ARPA",
	"120.100.IN-ADDR.ARPA",
	"121.100.IN-ADDR.ARPA",
	"122.100.IN-ADDR.ARPA",
	"123.100.IN-ADDR.ARPA",
	"124.100.IN-ADDR.ARPA",
	"125.100.IN-ADDR.ARPA",
	"126.100.IN-ADDR.ARPA",
	"127.100.IN-ADDR.ARPA",

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	/* RFC 5735 and RFC 5737 */
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	"0.IN-ADDR.ARPA",	/* THIS NETWORK */
	"127.IN-ADDR.ARPA",	/* LOOPBACK */
	"254.169.IN-ADDR.ARPA",	/* LINK LOCAL */
	"2.0.192.IN-ADDR.ARPA",	/* TEST NET */
	"100.51.198.IN-ADDR.ARPA",	/* TEST NET 2 */
	"113.0.203.IN-ADDR.ARPA",	/* TEST NET 3 */
	"255.255.255.255.IN-ADDR.ARPA",	/* BROADCAST */
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	/* Local IPv6 Unicast Addresses */
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	"0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA",
	"1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA",
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	/* LOCALLY ASSIGNED LOCAL ADDRESS SCOPE */
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	"D.F.IP6.ARPA",
	"8.E.F.IP6.ARPA",	/* LINK LOCAL */
	"9.E.F.IP6.ARPA",	/* LINK LOCAL */
	"A.E.F.IP6.ARPA",	/* LINK LOCAL */
	"B.E.F.IP6.ARPA",	/* LINK LOCAL */
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	/* Example Prefix, RFC 3849. */
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	"8.B.D.0.1.0.0.2.IP6.ARPA",
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	/* RFC 7534 */
	"EMPTY.AS112.ARPA",

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	/* RFC 8375 */
	"HOME.ARPA",

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	NULL
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};

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ISC_PLATFORM_NORETURN_PRE static void
fatal(const char *msg, isc_result_t result) ISC_PLATFORM_NORETURN_POST;
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static void
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named_server_reload(isc_task_t *task, isc_event_t *event);
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static isc_result_t
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ns_listenelt_fromconfig(const cfg_obj_t *listener, const cfg_obj_t *config,
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			cfg_aclconfctx_t *actx, isc_mem_t *mctx,
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			uint16_t family, ns_listenelt_t **target);
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static isc_result_t
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ns_listenlist_fromconfig(const cfg_obj_t *listenlist, const cfg_obj_t *config,
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			 cfg_aclconfctx_t *actx, isc_mem_t *mctx,
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			 uint16_t family, ns_listenlist_t **target);
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static isc_result_t
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configure_forward(const cfg_obj_t *config, dns_view_t *view,
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		  const dns_name_t *origin, const cfg_obj_t *forwarders,
		  const cfg_obj_t *forwardtype);
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static isc_result_t
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configure_alternates(const cfg_obj_t *config, dns_view_t *view,
		     const cfg_obj_t *alternates);
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static isc_result_t
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configure_zone(const cfg_obj_t *config, const cfg_obj_t *zconfig,
	       const cfg_obj_t *vconfig, isc_mem_t *mctx, dns_view_t *view,
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	       dns_viewlist_t *viewlist, dns_kasplist_t* kasplist,
	       cfg_aclconfctx_t *aclconf, bool added, bool old_rpz_ok,
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	       bool modify);
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static isc_result_t
configure_newzones(dns_view_t *view, cfg_obj_t *config, cfg_obj_t *vconfig,
		   isc_mem_t *mctx, cfg_aclconfctx_t *actx);

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static isc_result_t
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add_keydata_zone(dns_view_t *view, const char *directory, isc_mem_t *mctx);
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static void
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end_reserved_dispatches(named_server_t *server, bool all);
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static void
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newzone_cfgctx_destroy(void **cfgp);
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static inline isc_result_t
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putstr(isc_buffer_t **b, const char *str);
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static isc_result_t
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putmem(isc_buffer_t **b, const char *str, size_t len);

static isc_result_t
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putuint8(isc_buffer_t **b, uint8_t val);
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static inline isc_result_t
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putnull(isc_buffer_t **b);
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static int
count_zones(const cfg_obj_t *conf);

#ifdef HAVE_LMDB
static isc_result_t
migrate_nzf(dns_view_t *view);

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static isc_result_t
nzd_writable(dns_view_t *view);

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static isc_result_t
nzd_open(dns_view_t *view, unsigned int flags, MDB_txn **txnp, MDB_dbi *dbi);

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static isc_result_t
nzd_env_reopen(dns_view_t *view);

static void
nzd_env_close(dns_view_t *view);

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static isc_result_t
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nzd_close(MDB_txn **txnp, bool commit);
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static isc_result_t
nzd_count(dns_view_t *view, int *countp);
#else
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static isc_result_t
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nzf_append(dns_view_t *view, const cfg_obj_t *zconfig);
#endif
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/*%
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 * Configure a single view ACL at '*aclp'.  Get its configuration from
 * 'vconfig' (for per-view configuration) and maybe from 'config'
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 */
static isc_result_t
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configure_view_acl(const cfg_obj_t *vconfig, const cfg_obj_t *config,
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		   const cfg_obj_t *gconfig, const char *aclname,
		   const char *acltuplename, cfg_aclconfctx_t *actx,
		   isc_mem_t *mctx, dns_acl_t **aclp)
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{
	isc_result_t result;
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	const cfg_obj_t *maps[4];
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	const cfg_obj_t *aclobj = NULL;
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	int i = 0;

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	if (*aclp != NULL) {
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		dns_acl_detach(aclp);
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	}
	if (vconfig != NULL) {
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		maps[i++] = cfg_tuple_get(vconfig, "options");
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	}
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	if (config != NULL) {
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		const cfg_obj_t *options = NULL;
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		(void)cfg_map_get(config, "options", &options);
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		if (options != NULL) {
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			maps[i++] = options;
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		}
	}
	if (gconfig != NULL) {
		const cfg_obj_t *options = NULL;
		(void)cfg_map_get(gconfig, "options", &options);
		if (options != NULL) {
			maps[i++] = options;
		}
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	}
	maps[i] = NULL;
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	(void)named_config_get(maps, aclname, &aclobj);
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	if (aclobj == NULL) {
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		/*
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		 * No value available.	*aclp == NULL.
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		 */
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		return (ISC_R_SUCCESS);
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	}
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	if (acltuplename != NULL) {
		/*
		 * If the ACL is given in an optional tuple, retrieve it.
		 * The parser should have ensured that a valid object be
		 * returned.
		 */
		aclobj = cfg_tuple_get(aclobj, acltuplename);
	}

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	result = cfg_acl_fromconfig(aclobj, config, named_g_lctx,
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				    actx, mctx, 0, aclp);

	return (result);
}

/*%
 * Configure a sortlist at '*aclp'.  Essentially the same as
 * configure_view_acl() except it calls cfg_acl_fromconfig with a
 * nest_level value of 2.
 */
static isc_result_t
configure_view_sortlist(const cfg_obj_t *vconfig, const cfg_obj_t *config,
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			cfg_aclconfctx_t *actx, isc_mem_t *mctx,
			dns_acl_t **aclp)
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{
	isc_result_t result;
	const cfg_obj_t *maps[3];
	const cfg_obj_t *aclobj = NULL;
	int i = 0;

	if (*aclp != NULL)
		dns_acl_detach(aclp);
	if (vconfig != NULL)
		maps[i++] = cfg_tuple_get(vconfig, "options");
	if (config != NULL) {
		const cfg_obj_t *options = NULL;
		(void)cfg_map_get(config, "options", &options);
		if (options != NULL)
			maps[i++] = options;
	}
	maps[i] = NULL;

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	(void)named_config_get(maps, "sortlist", &aclobj);
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	if (aclobj == NULL)
		return (ISC_R_SUCCESS);

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	/*
	 * Use a nest level of 3 for the "top level" of the sortlist;
	 * this means each entry in the top three levels will be stored
	 * as lists of separate, nested ACLs, rather than merged together
	 * into IP tables as is usually done with ACLs.
	 */
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	result = cfg_acl_fromconfig(aclobj, config, named_g_lctx,
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				    actx, mctx, 3, aclp);
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	return (result);
}

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static isc_result_t
configure_view_nametable(const cfg_obj_t *vconfig, const cfg_obj_t *config,
			 const char *confname, const char *conftuplename,
			 isc_mem_t *mctx, dns_rbt_t **rbtp)
{
	isc_result_t result;
	const cfg_obj_t *maps[3];
	const cfg_obj_t *obj = NULL;
	const cfg_listelt_t *element;
	int i = 0;
	dns_fixedname_t fixed;
	dns_name_t *name;
	isc_buffer_t b;
	const char *str;
	const cfg_obj_t *nameobj;

	if (*rbtp != NULL)
		dns_rbt_destroy(rbtp);
	if (vconfig != NULL)
		maps[i++] = cfg_tuple_get(vconfig, "options");
	if (config != NULL) {
		const cfg_obj_t *options = NULL;
		(void)cfg_map_get(config, "options", &options);
		if (options != NULL)
			maps[i++] = options;
	}
	maps[i] = NULL;

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	(void)named_config_get(maps, confname, &obj);
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	if (obj == NULL)
		/*
		 * No value available.	*rbtp == NULL.
		 */
		return (ISC_R_SUCCESS);

	if (conftuplename != NULL) {
		obj = cfg_tuple_get(obj, conftuplename);
		if (cfg_obj_isvoid(obj))
			return (ISC_R_SUCCESS);
	}

	result = dns_rbt_create(mctx, NULL, NULL, rbtp);
	if (result != ISC_R_SUCCESS)
		return (result);

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	name = dns_fixedname_initname(&fixed);
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	for (element = cfg_list_first(obj);
	     element != NULL;
	     element = cfg_list_next(element)) {
		nameobj = cfg_listelt_value(element);
		str = cfg_obj_asstring(nameobj);
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		isc_buffer_constinit(&b, str, strlen(str));
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		isc_buffer_add(&b, strlen(str));
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		CHECK(dns_name_fromtext(name, &b, dns_rootname, 0, NULL));
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		/*
		 * We don't need the node data, but need to set dummy data to
		 * avoid a partial match with an empty node.  For example, if
		 * we have foo.example.com and bar.example.com, we'd get a match
		 * for baz.example.com, which is not the expected result.
		 * We simply use (void *)1 as the dummy data.
		 */
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		result = dns_rbt_addname(*rbtp, name, (void *)1);
		if (result != ISC_R_SUCCESS) {
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			cfg_obj_log(nameobj, named_g_lctx, ISC_LOG_ERROR,
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				    "failed to add %s for %s: %s",
				    str, confname, isc_result_totext(result));
			goto cleanup;
		}
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	}

	return (result);

  cleanup:
	dns_rbt_destroy(rbtp);
	return (result);
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}

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static isc_result_t
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ta_fromconfig(const cfg_obj_t *key, bool *initialp, dst_key_t **keyp,
	      dns_rdata_ds_t **dsp, const char **namestrp, isc_mem_t *mctx)
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{
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	dns_rdata_dnskey_t keystruct;
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	dns_rdata_ds_t *ds = NULL;
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	uint32_t n1, n2, n3;
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	const char *datastr = NULL, *namestr = NULL;
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	unsigned char data[4096];
	isc_buffer_t databuf;
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	unsigned char rrdata[4096];
	isc_buffer_t rrdatabuf;
	isc_region_t r;
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	dns_fixedname_t fname;
	dns_name_t *name = NULL;
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	isc_buffer_t namebuf;
	isc_result_t result;
	dst_key_t *dstkey = NULL;
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	const char *atstr = NULL;
	enum {
		INIT_DNSKEY,
		STATIC_DNSKEY,
		INIT_DS,
		STATIC_DS,
		TRUSTED
	} anchortype;
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	REQUIRE(keyp != NULL && *keyp == NULL);
	REQUIRE(dsp != NULL && *dsp == NULL);
	REQUIRE(namestrp != NULL && *namestrp == NULL);
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	/* if DNSKEY, flags; if DS, key tag */
	n1 = cfg_obj_asuint32(cfg_tuple_get(key, "n1"));

	/* if DNSKEY, protocol; if DS, algorithm */
	n2 = cfg_obj_asuint32(cfg_tuple_get(key, "n2"));

	/* if DNSKEY, algorithm; if DS, digest type */
	n3 = cfg_obj_asuint32(cfg_tuple_get(key, "n3"));
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	namestr = cfg_obj_asstring(cfg_tuple_get(key, "name"));
	*namestrp = namestr;
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	name = dns_fixedname_initname(&fname);
	isc_buffer_constinit(&namebuf, namestr, strlen(namestr));
	isc_buffer_add(&namebuf, strlen(namestr));
	CHECK(dns_name_fromtext(name, &namebuf, dns_rootname, 0, NULL));
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	if (*initialp) {
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		atstr = cfg_obj_asstring(cfg_tuple_get(key, "anchortype"));
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		if (strcasecmp(atstr, "static-key") == 0) {
			*initialp = false;
			anchortype = STATIC_DNSKEY;
		} else if (strcasecmp(atstr, "static-ds") == 0) {
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			*initialp = false;
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			anchortype = STATIC_DS;
		} else if (strcasecmp(atstr, "initial-key") == 0) {
			anchortype = INIT_DNSKEY;
		} else if (strcasecmp(atstr, "initial-ds") == 0) {
			anchortype = INIT_DS;
		} else {
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			cfg_obj_log(key, named_g_lctx, ISC_LOG_ERROR,
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				    "key '%s': "
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				    "invalid initialization method '%s'",
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				    namestr, atstr);
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			result = ISC_R_FAILURE;
			goto cleanup;
		}
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	} else {
		anchortype = TRUSTED;
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	}
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	isc_buffer_init(&databuf, data, sizeof(data));
	isc_buffer_init(&rrdatabuf, rrdata, sizeof(rrdata));

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	switch(anchortype) {
	case INIT_DNSKEY:
	case STATIC_DNSKEY:
	case TRUSTED:
		/*
		 * This function should never be reached for view
		 * class other than IN
		 */
		keystruct.common.rdclass = dns_rdataclass_in;
		keystruct.common.rdtype = dns_rdatatype_dnskey;
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		/*
		 * The key data in keystruct is not dynamically allocated.
		 */
		keystruct.mctx = NULL;
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		ISC_LINK_INIT(&keystruct.common, link);

		if (n1 > 0xffff) {
			CHECKM(ISC_R_RANGE, "key flags");
		}
		if (n1 & DNS_KEYFLAG_REVOKE) {
			CHECKM(DST_R_BADKEYTYPE, "key flags revoke bit set");
		}
		if (n2 > 0xff) {
			CHECKM(ISC_R_RANGE, "key protocol");
		}
		if (n3> 0xff) {
			CHECKM(ISC_R_RANGE, "key algorithm");
		}

		keystruct.flags = (uint16_t)n1;
		keystruct.protocol = (uint8_t)n2;
		keystruct.algorithm = (uint8_t)n3;

		datastr = cfg_obj_asstring(cfg_tuple_get(key, "data"));
		CHECK(isc_base64_decodestring(datastr, &databuf));
		isc_buffer_usedregion(&databuf, &r);
		keystruct.datalen = r.length;
		keystruct.data = r.base;

		CHECK(dns_rdata_fromstruct(NULL, keystruct.common.rdclass,
					   keystruct.common.rdtype,
					   &keystruct, &rrdatabuf));
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		CHECK(dst_key_fromdns(name, dns_rdataclass_in,
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				      &rrdatabuf, mctx, &dstkey));

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		*keyp = dstkey;
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		break;

	case INIT_DS:
	case STATIC_DS:
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		ds = isc_mem_get(mctx, sizeof(*ds));
		ds->common.rdclass = dns_rdataclass_in;
		ds->common.rdtype = dns_rdatatype_ds;
		ds->mctx = NULL;

		ISC_LINK_INIT(&ds->common, link);

		if (n1 > 0xffff) {
			CHECKM(ISC_R_RANGE, "key tag");
		}
		if (n2 > 0xff) {
			CHECKM(ISC_R_RANGE, "key algorithm");
		}
		if (n3 > 0xff) {
			CHECKM(ISC_R_RANGE, "digest type");
		}

		ds->key_tag = (uint16_t)n1;
		ds->algorithm = (uint8_t)n2;
		ds->digest_type = (uint8_t)n3;

		datastr = cfg_obj_asstring(cfg_tuple_get(key, "data"));
		CHECK(isc_hex_decodestring(datastr, &databuf));
		isc_buffer_usedregion(&databuf, &r);

		switch (ds->digest_type) {
		case DNS_DSDIGEST_SHA1:
			if (r.length != ISC_SHA1_DIGESTLENGTH) {
				CHECK(ISC_R_UNEXPECTEDEND);
			}
			break;
		case DNS_DSDIGEST_SHA256:
			if (r.length != ISC_SHA256_DIGESTLENGTH) {
				CHECK(ISC_R_UNEXPECTEDEND);
			}
			break;
		case DNS_DSDIGEST_SHA384:
			if (r.length != ISC_SHA384_DIGESTLENGTH) {
				CHECK(ISC_R_UNEXPECTEDEND);
			}
			break;
		}

		ds->mctx = mctx;
		ds->length = r.length;
		ds->digest = isc_mem_allocate(mctx, r.length);
		memmove(ds->digest, r.base, r.length);

		*dsp = ds;
		ds = NULL;
		break;
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	default:
		INSIST(0);
		ISC_UNREACHABLE();
	}
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	return (ISC_R_SUCCESS);

 cleanup:
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	if (dstkey != NULL) {
		dst_key_free(&dstkey);
	}

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	if (ds != NULL) {
		dns_rdata_freestruct(ds);
		isc_mem_put(mctx, ds, sizeof(*ds));
	}

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	return (result);
}

/*%
 * Parse 'key' in the context of view configuration 'vconfig'.  If successful,
 * add the key to 'secroots' if both of the following conditions are true:
 *
 *   - 'keyname_match' is NULL or it matches the owner name of 'key',
 *   - support for the algorithm used by 'key' is not disabled by 'resolver'
 *     for the owner name of 'key'.
 *
 * 'managed' is true for managed keys and false for trusted keys.  'mctx' is
 * the memory context to use for allocating memory.
 */
static isc_result_t
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process_key(const cfg_obj_t *key, dns_keytable_t *secroots,
	    const dns_name_t *keyname_match, dns_resolver_t *resolver,
	    bool managed, isc_mem_t *mctx)
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{
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	dns_fixedname_t fkeyname;
	dns_name_t *keyname = NULL;
	const char *namestr = NULL;
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	dst_key_t *dstkey = NULL;
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	dns_rdata_ds_t *ds = NULL;
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	unsigned int keyalg;
	isc_result_t result;
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	bool initializing = managed;
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	result = ta_fromconfig(key, &initializing, &dstkey, &ds,
			       &namestr, mctx);
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	switch (result) {
	case ISC_R_SUCCESS:
		/*
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		 * Trust anchor was parsed correctly. If dstkey is
		 * not NULL, then it was a key anchor, its algorithm
		 * is supported by the crypto library, and it is not
		 * revoked. If dstkey is NULL, then it was a DS
		 * trust anchor instead.
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		 */
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		if (dstkey != NULL) {
			keyname = dst_key_name(dstkey);
			keyalg = dst_key_alg(dstkey);
		} else {
			isc_buffer_t b;

			INSIST(ds != NULL);

			isc_buffer_constinit(&b, namestr, strlen(namestr));
			isc_buffer_add(&b, strlen(namestr));
			keyname = dns_fixedname_initname(&fkeyname);
			result = dns_name_fromtext(keyname, &b,
						   dns_rootname, 0, NULL);
			if (result != ISC_R_SUCCESS) {
				return (result);
			}
			keyalg = ds->algorithm;
		}
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		break;
	case DST_R_UNSUPPORTEDALG:
	case DST_R_BADKEYTYPE:
		/*
		 * Key was parsed correctly, but it cannot be used; this is not
		 * a fatal error - log a warning about this key being ignored,
		 * but do not prevent any further ones from being processed.
		 */
		cfg_obj_log(key, named_g_lctx, ISC_LOG_WARNING,
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			    "ignoring %s for '%s': %s",
			    initializing ? "initial-key" : "static-key",
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			    namestr, isc_result_totext(result));
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		return (ISC_R_SUCCESS);
	case DST_R_NOCRYPTO:
		/*
		 * Crypto support is not available.
		 */
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		cfg_obj_log(key, named_g_lctx, ISC_LOG_ERROR,
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			    "ignoring %s for '%s': no crypto support",
			    initializing ? "initial-key" : "static-key",
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			    namestr);
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		return (result);
	default:
		/*
		 * Something unexpected happened; we have no choice but to
		 * indicate an error so that the configuration loading process
		 * is interrupted.
		 */
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		cfg_obj_log(key, named_g_lctx, ISC_LOG_ERROR,
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			    "configuring %s for '%s': %s",
			    initializing ? "initial-key" : "static-key",
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			    namestr, isc_result_totext(result));
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		return (ISC_R_FAILURE);
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	}
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	/*
	 * If the caller requested to only load keys for a specific name and
	 * the owner name of this key does not match the requested name, do not
	 * load it.
	 */
	if (keyname_match != NULL && !dns_name_equal(keyname_match, keyname)) {
		goto done;
	}

	/*
	 * Ensure that 'resolver' allows using the algorithm of this key for
	 * its owner name.  If it does not, do not load the key and log a
	 * warning, but do not prevent further keys from being processed.
	 */
	if (!dns_resolver_algorithm_supported(resolver, keyname, keyalg)) {
		cfg_obj_log(key, named_g_lctx, ISC_LOG_WARNING,
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			    "ignoring %s for '%s': algorithm is disabled",
			    initializing ? "initial-key" : "static-key",
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			    namestr);
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		goto done;
	}

	/*
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	 * Add the key to 'secroots'.  Keys from a "dnssec-keys" or
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	 * "managed-keys" statement may be either static or initializing
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	 * keys. If it's not initializing, we don't want to treat it as
	 * managed, so we use 'initializing' twice here, for both the
	 * 'managed' and 'initializing' arguments to dns_keytable_add().
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	 */
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	result = dns_keytable_add(secroots, initializing,
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				  initializing, keyname,
				  dstkey != NULL ? &dstkey : NULL,
				  ds);
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 done:
	/*
	 * Ensure 'dstkey' does not leak.  Note that if dns_keytable_add()
	 * succeeds, ownership of the key structure is transferred to the key
	 * table, i.e. 'dstkey' is set to NULL.
	 */
	if (dstkey != NULL) {
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		dst_key_free(&dstkey);
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	}
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	/*
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	 * Free 'ds'.
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	 */
	if (ds != NULL) {
		dns_rdata_freestruct(ds);
		isc_mem_put(mctx, ds, sizeof(*ds));
	}