update.c 60.2 KB
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/*
 * 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/mem.h>
#include <isc/result.h>
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#include <isc/taskpool.h>
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#include <isc/util.h>
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#include <dns/acl.h>
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#include <dns/confip.h>
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#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/dbtable.h>
#include <dns/dnssec.h>
#include <dns/events.h>
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#include <dns/fixedname.h>
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#include <dns/journal.h>
#include <dns/message.h>
#include <dns/name.h>
#include <dns/nxt.h>
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#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rdatastruct.h>
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#include <dns/result.h>
#include <dns/types.h>
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#include <dns/view.h>
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#include <dns/zone.h>
#include <dns/zt.h>
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#include <named/globals.h>
#include <named/client.h>
#include <named/update.h>
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#include <named/log.h>
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/*
 * This module implements dynamic update as in RFC2136.
 */
  
/*
  XXX TODO:
  - forwarding
  - document strict minimality
*/

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/**************************************************************************/
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/*
 * Convenience macro of common isc_log_write() arguments
 * to use in reportings server errors.
 */
#define UPDATE_ERROR_LOGARGS \
	ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, \
	ISC_LOG_ERROR

/*
 * Convenience macro of common isc_log_write() arguments
 * to use in tracing dynamic update protocol requests.
 */
#define UPDATE_PROTOCOL_LOGARGS \
	ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, \
	ISC_LOG_INFO

/*
 * Convenience macro of common isc_log_write() arguments
 * to use in low-level debug tracing.
 */
#define UPDATE_DEBUG_LOGARGS \
	ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, \
	ISC_LOG_DEBUG(8)

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/*
 * Check an operation for failure.  These macros all assume that
 * the function using them has a 'result' variable and a 'failure'
 * label.
 */
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#define CHECK(op) \
	do { result = (op); 				  	 \
	       if (result != DNS_R_SUCCESS) goto failure; 	 \
	} while (0)
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/*
 * Fail unconditionally with result 'code', which must not
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 * be DNS_R_SUCCESS.  The reason for failure presumably has
 * been logged already.
 */

#define FAIL(code) \
	do {							\
		result = (code);				\
		goto failure;					\
	} while (0)

/*
 * Fail unconditionally and log as a client error.
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 */
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#define FAILC(code, msg) \
	do {							\
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		result = (code);				\
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		isc_log_write(UPDATE_PROTOCOL_LOGARGS,		\
			      "dynamic update failed: %s (%s)",	\
		      	      msg, isc_result_totext(code));	\
		goto failure;					\
	} while (0)

/*
 * Fail unconditionally and log as a server error.
 */
#define FAILS(code, msg) \
	do {							\
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		result = (code);				\
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		isc_log_write(UPDATE_PROTOCOL_LOGARGS,		\
			      "dynamic update error: %s: %s", 	\
			      msg, isc_result_totext(code));	\
		goto failure;					\
	} while (0)
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/**************************************************************************/

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typedef struct rr rr_t;

struct rr {
	/* dns_name_t name; */
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	isc_uint32_t 		ttl;
	dns_rdata_t 		rdata;
};

typedef struct update_event update_event_t;

struct update_event {
	ISC_EVENT_COMMON(update_event_t);
	dns_zone_t 		*zone;
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	isc_result_t		result;
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};

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/**************************************************************************/
/*
 * Forward declarations.
 */

static void update_action(isc_task_t *task, isc_event_t *event);
static void updatedone_action(isc_task_t *task, isc_event_t *event);

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/**************************************************************************/

/*
 * Update a single RR in version 'ver' of 'db' and log the
 * update in 'diff'.
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 *
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 * Ensures:
 *   '*tuple' == NULL.  Either the tuple is freed, or its
 *         ownership has been transferred to the diff.
 */
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static isc_result_t
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do_one_tuple(dns_difftuple_t **tuple,
	     dns_db_t *db, dns_dbversion_t *ver,
	     dns_diff_t *diff)
{
	dns_diff_t temp_diff;
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	isc_result_t result;
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	/* Create a singleton diff */
	dns_diff_init(diff->mctx, &temp_diff);
	ISC_LIST_APPEND(temp_diff.tuples, *tuple, link);

	/* Apply it to the database. */
	result = dns_diff_apply(&temp_diff, db, ver);
	if (result != DNS_R_SUCCESS) {
		dns_difftuple_free(tuple);
		return (result);
	}

	/* Merge it into the current pending journal entry. */
	dns_diff_appendminimal(diff, tuple);

	/* Do not clear temp_diff. */
	
	return (DNS_R_SUCCESS);
}
	      
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static isc_result_t
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update_one_rr(dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff,
	      dns_diffop_t op, dns_name_t *name, 
	      dns_ttl_t ttl, dns_rdata_t *rdata)
{
	dns_difftuple_t *tuple = NULL;
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	isc_result_t result;
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	result = dns_difftuple_create(diff->mctx, op,
				      name, ttl, rdata, &tuple);
	if (result != DNS_R_SUCCESS)
		return (result);
	return (do_one_tuple(&tuple, db, ver, diff));
}

/**************************************************************************/
/*
 * Callback-style iteration over rdatasets and rdatas.
 *
 * foreach_rrset() can be used to iterate over the RRsets 
 * of a name and call a callback function with each
 * one.  Similarly, foreach_rr() can be used to iterate
 * over the individual RRs at name, optionally restricted 
 * to RRs of a given type.
 *
 * The callback functions are called "actions" and take
 * two arguments: a void pointer for passing arbitrary
 * context information, and a pointer to the current RRset
 * or RR.  By convention, their names end in "_action".
 */

/*
 * XXXRTH  We might want to make this public somewhere in libdns.
 */

/* Function type for foreach_rrset() iterator actions. */
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typedef isc_result_t rrset_func(void *data, dns_rdataset_t *rrset);
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/* Function type for foreach_rr() iterator actions. */
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typedef isc_result_t rr_func(void *data, rr_t *rr);
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/* Internal context struct for foreach_node_rr(). */
typedef struct {
	rr_func *	rr_action;
	void *		rr_action_data;
} foreach_node_rr_ctx_t;

/* Internal helper function for foreach_node_rr(). */
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static isc_result_t
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foreach_node_rr_action(void *data, dns_rdataset_t *rdataset)
{
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	isc_result_t result;
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	foreach_node_rr_ctx_t *ctx = data;
	for (result = dns_rdataset_first(rdataset);
	     result == DNS_R_SUCCESS;
	     result = dns_rdataset_next(rdataset))
	{
		rr_t rr;
		dns_rdataset_current(rdataset, &rr.rdata);
		rr.ttl = rdataset->ttl;
		result = (*ctx->rr_action)(ctx->rr_action_data, &rr);
		if (result != DNS_R_SUCCESS)
			return (result);
	}
	if (result != DNS_R_NOMORE)
		return (result);
	return (DNS_R_SUCCESS);
}

/*
 * For each rdataset of 'name' in 'ver' of 'db', call 'action'
 * with the rdataset and 'action_data' as arguments.  If the name
 * does not exist, do nothing. 
 *
 * If 'action' returns an error, abort iteration and return the error.
 */
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static isc_result_t
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foreach_rrset(dns_db_t *db,
	      dns_dbversion_t *ver,
	      dns_name_t *name,
	      rrset_func *action,
	      void *action_data)
{
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	isc_result_t result;
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	dns_dbnode_t *node;
	dns_rdatasetiter_t *iter;
	
	node = NULL;
	result = dns_db_findnode(db, name, ISC_FALSE, &node);
	if (result == DNS_R_NOTFOUND)
		return (DNS_R_SUCCESS);
	if (result != DNS_R_SUCCESS)
		return (result);
	
	iter = NULL;
	result = dns_db_allrdatasets(db, node, ver,
				     (isc_stdtime_t) 0, &iter);
	if (result != DNS_R_SUCCESS)
		goto cleanup_node;

	for (result = dns_rdatasetiter_first(iter);
	     result == DNS_R_SUCCESS;
	     result = dns_rdatasetiter_next(iter))
	{
		dns_rdataset_t rdataset;

		dns_rdataset_init(&rdataset);
		dns_rdatasetiter_current(iter, &rdataset);

		result = (*action)(action_data, &rdataset);

		dns_rdataset_disassociate(&rdataset);
		if (result != DNS_R_SUCCESS)
			goto cleanup_iterator;
	}
	if (result == DNS_R_NOMORE)
		result = DNS_R_SUCCESS;

 cleanup_iterator:
	dns_rdatasetiter_destroy(&iter);

 cleanup_node:
	dns_db_detachnode(db, &node);	

	return (result);
}

/*
 * For each RR of 'name' in 'ver' of 'db', call 'action'
 * with the RR and 'action_data' as arguments.  If the name
 * does not exist, do nothing.
 *
 * If 'action' returns an error, abort iteration
 * and return the error.
 */
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static isc_result_t
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foreach_node_rr(dns_db_t *db,
	    dns_dbversion_t *ver,
	    dns_name_t *name,
	    rr_func *rr_action,
	    void *rr_action_data)
{
	foreach_node_rr_ctx_t ctx;
	ctx.rr_action = rr_action;
	ctx.rr_action_data = rr_action_data;
	return (foreach_rrset(db, ver, name,
			      foreach_node_rr_action, &ctx));
}


/*
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 * For each of the RRs specified by 'db', 'ver', 'name', 'type',
 * (which can be dns_rdatatype_any to match any type), and 'covers', call
 * 'action' with the RR and 'action_data' as arguments. If the name 
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 * does not exist, or if no RRset of the given type exists at the name,
 * do nothing.
 * 
 * If 'action' returns an error, abort iteration and return the error.
 */
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static isc_result_t
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foreach_rr(dns_db_t *db,
	   dns_dbversion_t *ver,
	   dns_name_t *name,
	   dns_rdatatype_t type,
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	   dns_rdatatype_t covers,
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	   rr_func *rr_action,
	   void *rr_action_data)
{

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	isc_result_t result;
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	dns_dbnode_t *node;
	dns_rdataset_t rdataset;

	if (type == dns_rdatatype_any)
		return (foreach_node_rr(db, ver, name, 
					rr_action, rr_action_data));
	
	node = NULL;
	result = dns_db_findnode(db, name, ISC_FALSE, &node);
	if (result == DNS_R_NOTFOUND)
		return (DNS_R_SUCCESS);
	if (result != DNS_R_SUCCESS)
		return (result);

	dns_rdataset_init(&rdataset);
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	result = dns_db_findrdataset(db, node, ver, type, covers,
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				     (isc_stdtime_t) 0, &rdataset, NULL);
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	if (result == DNS_R_NOTFOUND) {
		result = DNS_R_SUCCESS;
		goto cleanup_node;
	}
	if (result != DNS_R_SUCCESS)
		goto cleanup_node;

	for (result = dns_rdataset_first(&rdataset);
	     result == DNS_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset))
	{
		rr_t rr;
		dns_rdataset_current(&rdataset, &rr.rdata);
		rr.ttl = rdataset.ttl;
		result = (*rr_action)(rr_action_data, &rr);
		if (result != DNS_R_SUCCESS)
			goto cleanup_rdataset;
	}
	if (result != DNS_R_NOMORE)
		goto cleanup_rdataset;
	result = DNS_R_SUCCESS;

 cleanup_rdataset:
	dns_rdataset_disassociate(&rdataset);
 cleanup_node:
	dns_db_detachnode(db, &node);	

	return (result);
}


/**************************************************************************/
/*
 * Various tests on the database contents (for prerequisites, etc).
 */

/*
 * Function type for predicate functions that compare a database RR 'db_rr'
 * against an update RR 'update_rr'.
 */
typedef isc_boolean_t rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr);

/* Helper function for rrset_exists(). */
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static isc_result_t
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rrset_exists_action(void *data, rr_t *rr) /*ARGSUSED*/
{
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	UNUSED(data);
	UNUSED(rr);
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	return (DNS_R_EXISTS);
}

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/*
 * Utility macro for RR existence checking functions.
 *
 * If the variable 'result' has the value DNS_R_EXISTS or
 * DNS_R_SUCCESS, set *exists to ISC_TRUE or ISC_FALSE,
 * respectively, and return success.
 *
 * If 'result' has any other value, there was a failure.
 * Return the failure result code and do not set *exists.
 *
 * This would be more readable as "do { if ... } while(0)",
 * but that form generates tons of warnings on Solaris 2.6.
 */
#define RETURN_EXISTENCE_FLAG 				\
	return ((result == DNS_R_EXISTS) ? 		\
		(*exists = ISC_TRUE, DNS_R_SUCCESS) : 	\
		((result == DNS_R_SUCCESS) ?		\
		 (*exists = ISC_FALSE, DNS_R_SUCCESS) :	\
		 result));
	
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/*
 * Set '*exists' to true iff an rrset of the given type exists,
 * to false otherwise.
 */
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static isc_result_t
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rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
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	     dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers,
	     isc_boolean_t *exists)
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{
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	isc_result_t result;
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	result = foreach_rr(db, ver, name, type, covers,
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			    rrset_exists_action, NULL);
	RETURN_EXISTENCE_FLAG;
}

/* Helper function for cname_incompatible_rrset_exists */
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static isc_result_t
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cname_compatibility_action(void *data, dns_rdataset_t *rrset) 
/*ARGSUSED*/
{
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	UNUSED(data);
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	if (rrset->type != dns_rdatatype_cname &&
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	    ! dns_rdatatype_isdnssec(rrset->type))
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		return (DNS_R_EXISTS);
	return (DNS_R_SUCCESS);
}

/*
 * Check whether there is an rrset incompatible with adding a CNAME RR,
 * i.e., anything but another CNAME (which can be replaced) or a
 * DNSSEC RR (which can coexist).
 *
 * If such an incompatible rrset exists, set '*exists' to ISC_TRUE.
 * Otherwise, set it to ISC_FALSE.
 */
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static isc_result_t
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cname_incompatible_rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
				dns_name_t *name, isc_boolean_t *exists) {
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	isc_result_t result;	
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	result = foreach_rrset(db, ver, name, 
			       cname_compatibility_action, NULL);
	RETURN_EXISTENCE_FLAG;
}

/* Helper function for rr_count(). */
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static isc_result_t 
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count_rr_action(void *data, rr_t *rr) /*ARGSUSED*/ {
	int *countp = data;
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	UNUSED(rr);
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	(*countp)++;
	return (DNS_R_SUCCESS);
}

/*
 * Count the number of RRs of 'type' belonging to 'name' in 'ver' of 'db'.
 */
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static isc_result_t
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rr_count(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
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	 dns_rdatatype_t type, dns_rdatatype_t covers, int *countp)
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{
	*countp = 0;
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	return (foreach_rr(db, ver, name, type, covers,
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			   count_rr_action, countp));
}

/* Context struct for matching_rr_exists(). */

typedef struct {
	rr_predicate *predicate;
	dns_db_t *db;
	dns_dbversion_t *ver;
	dns_name_t *name;
	dns_rdata_t *update_rr;
} matching_rr_exists_ctx_t;

/* Helper function for matching_rr_exists(). */

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static isc_result_t 
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matching_rr_exists_action(void *data, rr_t *rr) {
	matching_rr_exists_ctx_t *ctx = data;
	if ((*ctx->predicate)(ctx->update_rr, &rr->rdata))
		return (DNS_R_EXISTS);
	return (DNS_R_SUCCESS);
}

/*
 * Compare the 'update_rr' with all RRs in the RRset specified by 'db', 
 * 'ver', 'name', and 'type' using 'predicate'.  If the predicate returns
 * true for at least one of them, set '*exists' to ISC_TRUE.  Otherwise,
 * set it to ISC_FALSE.
 */
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matching_rr_exists(rr_predicate *predicate,
	     dns_db_t *db,
	     dns_dbversion_t *ver,
	     dns_name_t *name,
	     dns_rdatatype_t type,
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	     dns_rdatatype_t covers,
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	     dns_rdata_t *update_rr,
	     isc_boolean_t *exists)
{
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	matching_rr_exists_ctx_t ctx;
	ctx.predicate = predicate;
	ctx.db = db;
	ctx.ver = ver;
	ctx.name = name;
	ctx.update_rr = update_rr;
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	result = foreach_rr(db, ver, name, type, covers,
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			    matching_rr_exists_action, &ctx);
	RETURN_EXISTENCE_FLAG;
}


/* Context struct and helper function for name_exists() */

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name_exists_action(void *data, dns_rdataset_t *rrset) /*ARGSUSED*/
{
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	UNUSED(data);
	UNUSED(rrset);
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	return (DNS_R_EXISTS);
}

/*
 * Set '*exists' to true iff the given name exists, to false otherwise.
 */
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name_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
	    isc_boolean_t *exists)
{
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	result = foreach_rrset(db, ver, name,
			       name_exists_action, NULL);
	RETURN_EXISTENCE_FLAG;
}

/**************************************************************************/
/*
 * Checking of "RRset exists (value dependent)" prerequisites.
 *
 * In the RFC2136 section 3.2.5, this is the pseudocode involving
 * a variable called "temp", a mapping of <name, type> tuples to rrsets.
 *
 * Here, we represent the "temp" data structure as (non-minimial) "dns_diff_t"
 * where each typle has op==DNS_DIFFOP_EXISTS.
 */


/*
 * Append a tuple asserting the existence of the RR with
 * 'name' and 'rdata' to 'diff'.
 */	     
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temp_append(dns_diff_t *diff, dns_name_t *name, dns_rdata_t *rdata)
{
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	dns_difftuple_t *tuple = NULL;
	
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	REQUIRE(DNS_DIFF_VALID(diff));
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	CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_EXISTS,
				      name, 0, rdata, &tuple));
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	ISC_LIST_APPEND(diff->tuples, tuple, link);
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	return (result);
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}

/*
 * Compare two rdatasets represented as sorted lists of tuples.
 * All list elements must have the same owner name and type.
 * Return DNS_R_SUCCESS if the rdatasets are equal, rcode(dns_rcode_nxrrset)
 * if not.
 */
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temp_check_rrset(dns_difftuple_t *a, dns_difftuple_t *b) {
	for (;;) {
		if (a == NULL || b == NULL)
			break;
		INSIST(a->op == DNS_DIFFOP_EXISTS && b->op == DNS_DIFFOP_EXISTS);
		INSIST(a->rdata.type == b->rdata.type);
		INSIST(dns_name_equal(&a->name, &b->name));
		if (dns_rdata_compare(&a->rdata, &b->rdata) != 0)
			return (DNS_R_NXRRSET);
		a = ISC_LIST_NEXT(a, link);
		b = ISC_LIST_NEXT(b, link);
	}
	if (a != NULL || b != NULL)
		return (DNS_R_NXRRSET);
	return (DNS_R_SUCCESS);
}

/*
 * A comparison function defining the sorting order for the entries
 * in the "temp" data structure.  The major sort key is the owner name,
 * followed by the type and rdata.
 */
static int 
temp_order(const void *av, const void *bv)
{
	dns_difftuple_t * const *ap = av;
	dns_difftuple_t * const *bp = bv;
	dns_difftuple_t *a = *ap;
	dns_difftuple_t *b = *bp;	
	int r;
	r = dns_name_compare(&a->name, &b->name);
	if (r != 0)
		return (r);
	r = (b->rdata.type - a->rdata.type);
	if (r != 0)
		return (r);
	r = dns_rdata_compare(&a->rdata, &b->rdata);
	return (r);
}

/*
 * Check the "RRset exists (value dependent)" prerequisite information
 * in 'temp' against the contents of the database 'db'.
 *
 * Return DNS_R_SUCCESS if the prerequisites are satisfied,
 * rcode(dns_rcode_nxrrset) if not.
 */

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temp_check(isc_mem_t *mctx, dns_diff_t *temp, dns_db_t *db,
	   dns_dbversion_t *ver)
{
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	dns_name_t *name;
	dns_dbnode_t *node;
	dns_difftuple_t *t;
	dns_diff_t trash;
	
	/* Exit early if the list is empty (for efficiency only). */
	if (ISC_LIST_HEAD(temp->tuples) == NULL)
		return (DNS_R_SUCCESS);

	/*
	 * Sort the prerequisite records by owner name,
	 * type, and rdata.
	 */
	result = dns_diff_sort(temp, temp_order);
	if (result != DNS_R_SUCCESS)
		return (result);

	dns_diff_init(mctx, &trash);
	
	/*
	 * For each name and type in the prerequisites,
	 * construct a sorted rdata list of the corresponding
	 * database contents, and compare the lists.
	 */
	t = ISC_LIST_HEAD(temp->tuples);
	while (t != NULL) {
		name = &t->name;

		/* A new unique name begins here. */
		node = NULL;
		result = dns_db_findnode(db, name, ISC_FALSE, &node);
		if (result == DNS_R_NOTFOUND)
			return (DNS_R_NXRRSET);
		if (result != DNS_R_SUCCESS)
			return (result);

		/* A new unique type begins here. */		
		while (t != NULL && dns_name_equal(&t->name, name)) {
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			dns_rdatatype_t type, covers;
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			dns_rdataset_t rdataset;
			dns_diff_t d_rrs; /* Database RRs with 
						this name and type */
 			dns_diff_t u_rrs; /* Update RRs with
						this name and type */

			type = t->rdata.type;
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			if (type == dns_rdatatype_sig)
				covers = dns_rdata_covers(&t->rdata);
			else
				covers = 0;
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			/*
			 * Collect all database RRs for this name and type
			 * onto d_rrs and sort them.
			 */
			dns_rdataset_init(&rdataset);
			result = dns_db_findrdataset(db, node, ver, type,
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						     covers, (isc_stdtime_t) 0,
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						     &rdataset, NULL);
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			if (result != DNS_R_SUCCESS) {
				dns_db_detachnode(db, &node);
				return (DNS_R_NXRRSET);
			}

			dns_diff_init(mctx, &d_rrs);
			dns_diff_init(mctx, &u_rrs);

			for (result = dns_rdataset_first(&rdataset);
			     result == DNS_R_SUCCESS;
			     result = dns_rdataset_next(&rdataset))
			{
				dns_rdata_t rdata;
				dns_rdataset_current(&rdataset, &rdata);
				result = temp_append(&d_rrs, name, &rdata);
				if (result != DNS_R_SUCCESS)
					goto failure;
			}
			if (result != DNS_R_NOMORE)
				goto failure;
			result = dns_diff_sort(&d_rrs, temp_order);
			if (result != DNS_R_SUCCESS) 
				goto failure;

			/*
			 * Collect all update RRs for this name and type
			 * onto u_rrs.  No need to sort them here - 
			 * they are already sorted.
			 */
			while (t != NULL &&
			       dns_name_equal(&t->name, name) &&
			       t->rdata.type == type)
			{
				dns_difftuple_t *next =
					ISC_LIST_NEXT(t, link);
				ISC_LIST_UNLINK(temp->tuples, t, link);
				ISC_LIST_APPEND(u_rrs.tuples, t, link);
				t = next;
			}

			/* Compare the two sorted lists. */
			result = temp_check_rrset(ISC_LIST_HEAD(u_rrs.tuples),
						  ISC_LIST_HEAD(d_rrs.tuples));
			if (result != DNS_R_SUCCESS)
				goto failure;

			/*
			 * We are done with the tuples, but we can't free
			 * them yet because "name" still points into one
			 * of them.  Move them on a temporary list.
			 */
			ISC_LIST_APPENDLIST(trash.tuples, u_rrs.tuples, link);
			ISC_LIST_APPENDLIST(trash.tuples, d_rrs.tuples, link);
			dns_rdataset_disassociate(&rdataset);

			continue;

		    failure:
			dns_diff_clear(&d_rrs);
			dns_diff_clear(&u_rrs);
			dns_diff_clear(&trash);
			dns_rdataset_disassociate(&rdataset);
			dns_db_detachnode(db, &node);
			return (result);
		}

		dns_db_detachnode(db, &node);
	}
	
	dns_diff_clear(&trash);	
	return (DNS_R_SUCCESS);
}

/**************************************************************************/
/*
 * Conditional deletion of RRs.
 */

/* Context structure for delete_if(). */

typedef struct {
	rr_predicate *predicate;
	dns_db_t *db;
	dns_dbversion_t *ver;
	dns_diff_t *diff;
	dns_name_t *name;
	dns_rdata_t *update_rr;
} conditional_delete_ctx_t;

/* Predicate functions for delete_if(). */

/* Return true iff 'update_rr' is neither a SOA nor an NS RR. */
static isc_boolean_t
type_not_soa_nor_ns_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) /*ARGSUSED*/
{
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	UNUSED(update_rr);
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	return ((db_rr->type != dns_rdatatype_soa &&
		 db_rr->type != dns_rdatatype_ns) ?
		ISC_TRUE : ISC_FALSE);
}

/* Return true always. */
static isc_boolean_t
true_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) /*ARGSUSED*/
{
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	UNUSED(update_rr);
	UNUSED(db_rr);
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	return (ISC_TRUE);
}

/* Return true iff the two RRs have identical rdata. */
static isc_boolean_t
rr_equal_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
	/*
	 * XXXRTH  This is not a problem, but we should consider creating
	 *         dns_rdata_equal() (that used dns_name_equal()), since it
	 *         would be faster.  Not a priority.
	 */
	return (dns_rdata_compare(update_rr, db_rr) == 0 ?
		ISC_TRUE : ISC_FALSE);
}

/*
 * Return true iff 'update_rr' should replace 'db_rr' according
 * to the special RFC2136 rules for CNAME, SOA, and WKS records.
 */
static isc_boolean_t
replaces_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
	if (db_rr->type != update_rr->type)
		return (ISC_FALSE);
	if (db_rr->type == dns_rdatatype_cname)
		return (ISC_TRUE);
	if (db_rr->type == dns_rdatatype_soa)
		return (ISC_TRUE);
	/*
	 * RFC2136 does not mention NXT, but multiple NXTs make little
	 * sense, so we replace those, too.
	 */
	if (db_rr->type == dns_rdatatype_nxt)
		return (ISC_TRUE);
	if (db_rr->type == dns_rdatatype_wks) {
		/*
		 * Compare the address and protocol fields only.  These
		 * form the first five bytes of the RR data.  Do a 
		 * raw binary comparison; unpacking the WKS RRs using
		 * dns_rdata_tostruct() might be cleaner in some ways,
		 * but it would require us to pass around an mctx.
		 */
		INSIST(db_rr->length >= 5 && update_rr->length >= 5);
		return (memcmp(db_rr->data, update_rr->data, 5) == 0 ?
			ISC_TRUE : ISC_FALSE);
	}
	return (ISC_FALSE);
}

/* Internal helper function for delete_if(). */
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delete_if_action(void *data, rr_t *rr) {
	conditional_delete_ctx_t *ctx = data;
	if ((*ctx->predicate)(ctx->update_rr, &rr->rdata)) {
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		result = update_one_rr(ctx->db, ctx->ver, ctx->diff,
				       DNS_DIFFOP_DEL, ctx->name,
				       rr->ttl, &rr->rdata);
		return (result);
	} else {
		return (DNS_R_SUCCESS);
	}
}

/*
 * Conditionally delete RRs.  Apply 'predicate' to the RRs
 * specified by 'db', 'ver', 'name', and 'type' (which can
 * be dns_rdatatype_any to match any type).  Delete those
 * RRs for which the predicate returns true, and log the 
 * deletions in 'diff'.
 */
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delete_if(rr_predicate *predicate,
	  dns_db_t *db,
	  dns_dbversion_t *ver,
	  dns_name_t *name,
	  dns_rdatatype_t type,
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	  dns_rdatatype_t covers,
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	  dns_rdata_t *update_rr,
	  dns_diff_t *diff)
{
	conditional_delete_ctx_t ctx;
	ctx.predicate = predicate;
	ctx.db = db;
	ctx.ver = ver;
	ctx.diff = diff;
	ctx.name = name;
	ctx.update_rr = update_rr;
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	return (foreach_rr(db, ver, name, type, covers,
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			   delete_if_action, &ctx));
}

/**************************************************************************/
/*
 * Miscellaneous subroutines.
 */

/*
 * Extract a single update RR from 'section' of dynamic update message
 * 'msg', with consistency checking.
 *
 * Stores the owner name, rdata, and TTL of the update RR at 'name',
 * 'rdata', and 'ttl', respectively.
 */
static void
get_current_rr(dns_message_t *msg, dns_section_t section,
	       dns_rdataclass_t zoneclass,
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	       dns_name_t **name, dns_rdata_t *rdata, dns_rdatatype_t *covers,
	       dns_ttl_t *ttl,
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	       dns_rdataclass_t *update_class)
{
	dns_rdataset_t *rdataset;
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	dns_message_currentname(msg, section, name);
	rdataset = ISC_LIST_HEAD((*name)->list);
	INSIST(rdataset != NULL);
	INSIST(ISC_LIST_NEXT(rdataset, link) == NULL);
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	*covers = rdataset->covers;
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	*ttl = rdataset->ttl;
	result = dns_rdataset_first(rdataset);
	INSIST(result == DNS_R_SUCCESS);
	dns_rdataset_current(rdataset, rdata);
	INSIST(dns_rdataset_next(rdataset) == DNS_R_NOMORE);
	*update_class = rdata->rdclass;
	rdata->rdclass = zoneclass;
}

/*
 * Increment the SOA serial number of database 'db', version 'ver'.
 * Replace the SOA record in the database, and log the 
 * change in 'diff'.
 */

	/*
	 * XXXRTH  Failures in this routine will be worth logging, when
	 *         we have a logging system.  Failure to find the zonename
	 *	   or the SOA rdataset warrant at least an UNEXPECTED_ERROR().
	 */

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increment_soa_serial(dns_db_t *db, dns_dbversion_t *ver,
		     dns_diff_t *diff, isc_mem_t *mctx)
{
	dns_difftuple_t *deltuple = NULL;
	dns_difftuple_t *addtuple = NULL;
	isc_uint32_t serial;
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	isc_result_t result;
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	CHECK(dns_db_createsoatuple(db, ver, mctx, DNS_DIFFOP_DEL, &deltuple));
	CHECK(dns_difftuple_copy(deltuple, &addtuple));
	addtuple->op = DNS_DIFFOP_ADD;

	serial = dns_soa_getserial(&addtuple->rdata);
	
	/* RFC1982 */
	serial = (serial + 1) & 0xFFFFFFFF;
	if (serial == 0) 
		serial = 1;

	dns_soa_setserial(serial, &addtuple->rdata);
	CHECK(do_one_tuple(&addtuple, db, ver, diff));
	CHECK(do_one_tuple(&deltuple, db, ver, diff));
	result = DNS_R_SUCCESS;
	
 failure:
	if (addtuple != NULL)
		dns_difftuple_free(&addtuple);
	if (deltuple != NULL)
		dns_difftuple_free(&deltuple);
	return (result);
}

/*
 * Check that the new SOA record at 'update_rdata' does not
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 * illegally cause the SOA serial number to decrease or stay
 * unchanged relative to the existing SOA in 'db'.
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 *
 * Sets '*ok' to ISC_TRUE if the update is legal, ISC_FALSE if not.
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 *
 * William King points out that RFC2136 is inconsistent about
 * the case where the serial number stays unchanged:
 * 
 *   section 3.4.2.2 requires a server to ignore a SOA update request
 *   if the serial number on the update SOA is less_than_or_equal to
 *   the zone SOA serial.
 * 
 *   section 3.6 requires a server to ignore a SOA update request if
 *   the serial is less_than the zone SOA serial.
 *
 * Paul says 3.4.2.2 is correct.
 *
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 */
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static isc_result_t
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check_soa_increment(dns_db_t *db, dns_dbversion_t *ver, 
		    dns_rdata_t *update_rdata,
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		    isc_boolean_t *ok)
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{
	isc_uint32_t db_serial;
	isc_uint32_t update_serial;
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	isc_result_t result;
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	update_serial = dns_soa_getserial(update_rdata);
	
	result = dns_db_getsoaserial(db, ver, &db_serial);
	if (result != DNS_R_SUCCESS)
		return (result);

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	if (DNS_SERIAL_GE(db_serial, update_serial)) {
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		*ok = ISC_FALSE;
	} else {
		*ok = ISC_TRUE;
	}

	return (DNS_R_SUCCESS);

}

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/**************************************************************************/
/*
 * Incremental updating of NXTs and SIGs.
 */

#define MAXZONEKEYS 32	/* Maximum number of zone keys supported. */

/*
 * We abuse the dns_diff_t type to represent a set of domain names
 * affected by the update.
 */
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static isc_result_t
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namelist_append_name(dns_diff_t *list, dns_name_t *name) {
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	isc_result_t result;
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	dns_difftuple_t *tuple = NULL;
	static dns_rdata_t dummy_rdata = { NULL, 0, 0, 0, { NULL, NULL } };
	CHECK(dns_difftuple_create(list->mctx, DNS_DIFFOP_EXISTS, name, 0,
				   &dummy_rdata, &tuple));
	dns_diff_append(list, &tuple);
 failure:
	return (result);
}

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static isc_result_t
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namelist_append_subdomain(dns_db_t *db, dns_name_t *name, dns_diff_t *affected)
{
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	isc_result_t result;
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	dns_fixedname_t fixedname;
	dns_name_t *child;
	dns_dbiterator_t *dbit = NULL;
	
	dns_fixedname_init(&fixedname);
	child = dns_fixedname_name(&fixedname);

	CHECK(dns_db_createiterator(db, ISC_FALSE, &dbit));
	
	for (result = dns_dbiterator_seek(dbit, name);
	     result == DNS_R_SUCCESS;
	     result = dns_dbiterator_next(dbit))
	{
		dns_dbnode_t *node = NULL;
		result = dns_dbiterator_current(dbit, &node, child);
		dns_db_detachnode(db, &node);
		CHECK(result);
		if (! dns_name_issubdomain(child, name))
			break;
		CHECK(namelist_append_name(affected, child));
	}
 failure:
	if (dbit != NULL)
		dns_dbiterator_destroy(&dbit);
	return (result);
}



/* Helper function for non_nxt_rrset_exists(). */
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static isc_result_t
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is_non_nxt_action(void *data, dns_rdataset_t *rrset) 
/*ARGSUSED*/
{
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	UNUSED(data);
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	if (!(rrset->type == dns_rdatatype_nxt ||
	      (rrset->type == dns_rdatatype_sig &&
	       rrset->covers == dns_rdatatype_nxt)))
		return (DNS_R_EXISTS);
	return (DNS_R_SUCCESS);
}

/*
 * Check whether there is an rrset other than a NXT or SIG NXT,
 * i.e., anything that justifies the continued existence of a name
 * after a secure update.
 *
 * If such an rrset exists, set '*exists' to ISC_TRUE.
 * Otherwise, set it to ISC_FALSE.
 */
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static isc_result_t
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non_nxt_rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
		     dns_name_t *name, isc_boolean_t *exists) {
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	isc_result_t result;	
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	result = foreach_rrset(db, ver, name, 
			       is_non_nxt_action, NULL);
	RETURN_EXISTENCE_FLAG;
}

/*
 * A comparison function for sorting dns_diff_t:s by name.
 */
static int 
name_order(const void *av, const void *bv)
{
	dns_difftuple_t * const *ap = av;
	dns_difftuple_t * const *bp = bv;
	dns_difftuple_t *a = *ap;
	dns_difftuple_t *b = *bp;	
	return (dns_name_compare(&a->name, &b->name));
}

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static isc_result_t
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uniqify_name_list(dns_diff_t *list) {
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	isc_result_t result;
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	dns_difftuple_t *p, *q;
	
	CHECK(dns_diff_sort(list, name_order));

	p = ISC_LIST_HEAD(list->tuples);
	while (p != NULL) {
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		do {
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			q = ISC_LIST_NEXT(p, link);
			if (q == NULL || ! dns_name_equal(&p->name, &q->name))
				break;
			ISC_LIST_UNLINK(list->tuples, q, link);
			dns_difftuple_free(&q);
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		} while (1);
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		p = ISC_LIST_NEXT(p, link);
	}
 failure:
	return (result);
}


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static isc_result_t
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is_glue(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
	isc_boolean_t *flag)
{
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	isc_result_t result;
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	dns_fixedname_t foundname;
	dns_fixedname_init(&foundname);
	result = dns_db_find(db, name, ver, dns_rdatatype_any,
			     DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD,
			     (isc_stdtime_t) 0, NULL,
			     dns_fixedname_name(&foundname),
			     NULL, NULL);
	if (result == DNS_R_SUCCESS) {
		*flag = ISC_FALSE;
		return (DNS_R_SUCCESS);
	} else if (result == DNS_R_ZONECUT) {
		/* XXX should omit non-delegation types from NXT */
		*flag = ISC_FALSE;
		return (DNS_R_SUCCESS);
	} else if (result == DNS_R_GLUE) {
		*flag = ISC_TRUE;
		return (DNS_R_SUCCESS);
	} else {
		return (result);
	}
}

/*
 * Find the next/previous name that has a NXT record.  
 * In other words, skip empty database nodes and names that
 * have  had their NXTs removed because they are obscured by
 * a zone cut.
 */
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next_active(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *oldname,
     dns_name_t *newname, isc_boolean_t forward)
{
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	dns_dbiterator_t *dbit = NULL;
	isc_boolean_t has_nxt;

	CHECK(dns_db_createiterator(db, ISC_FALSE, &dbit));
	
	CHECK(dns_dbiterator_seek(dbit, oldname));
	do {
		dns_dbnode_t *node = NULL;
		
		if (forward)
			result = dns_dbiterator_next(dbit);			
		else
			result = dns_dbiterator_prev(dbit);
		if (result == DNS_R_NOMORE) {
			/* Wrap around. */
			if (forward)
				CHECK(dns_dbiterator_first(dbit));
			else 
				CHECK(dns_dbiterator_last(dbit));
		}
		dns_dbiterator_current(dbit, &node, newname);
		dns_db_detachnode(db, &node);

		/*
		 * The iterator may hold the tree lock, and
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		 * rrset_exists() calls dns_db_findnode() which
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		 * may try to reacquire it.  To avoid deadlock
		 * we must pause the iterator first.
		 */
		CHECK(dns_dbiterator_pause(dbit));
		CHECK(rrset_exists(db, ver, newname,
				   dns_rdatatype_nxt, 0, &has_nxt));

	} while (! has_nxt);
 failure:
	if (dbit != NULL)
		dns_dbiterator_destroy(&dbit);

	return (result);
}

/*
 * Add a NXT record for "name", recording the change in "diff".
 */
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add_nxt(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_diff_t *diff) {
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	isc_result_t result;
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	dns_dbnode_t *node = NULL;
	unsigned char buffer[DNS_NXT_BUFFERSIZE];
	dns_rdata_t rdata;
	dns_difftuple_t *tuple = NULL;
	dns_fixedname_t fixedname;
	dns_name_t *target;

	dns_fixedname_init(&fixedname);
	target = dns_fixedname_name(&fixedname);	
	
	      
	/* Find the successor name, aka NXT target. */
	CHECK(next_active(db, ver, name, target, ISC_TRUE));

	/* Create the NXT RDATA. */
	CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
	dns_rdata_init(&rdata);
	CHECK(dns_buildnxtrdata(db, ver, node, target, buffer, &rdata));
	dns_db_detachnode(db, &node);	

	/* Create a diff tuple, update the database, and record the change. */
	CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name,
				   3600,	/* XXXRTH */	   
				   &rdata, &tuple));
	CHECK(do_one_tuple(&tuple, db, ver, diff));
	INSIST(tuple == NULL);
	
 failure:
	if (node != NULL)
		dns_db_detachnode(db, &node);
	return (result);
}

/*
 * Add a placeholder NXT record for "name", recording the change in "diff".
 */
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	dns_difftuple_t *tuple = NULL;
	isc_region_t r;
	unsigned char data[1] = { 0 }; /* The root domain, no bits. */
	dns_rdata_t rdata;

	r.base = data;
	r.length = sizeof data;
	dns_rdata_fromregion(&rdata, dns_db_class(db), dns_rdatatype_nxt, &r);
	CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 0,
				   &rdata, &tuple));
	CHECK(do_one_tuple(&tuple, db, ver, diff));
 failure:
	return (result);
}

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static isc_result_t
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find_zone_keys(dns_db_t *db, dns_dbversion_t *ver, isc_mem_t *mctx,
	       unsigned int maxkeys, dst_key_t **keys, unsigned int *nkeys)
{
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	dns_dbnode_t *node = NULL;
	CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node));
	CHECK(dns_dnssec_findzonekeys(db, ver, node, dns_db_origin(db),
				      mctx, maxkeys, keys, nkeys));
 failure:
	if (node != NULL)
		dns_db_detachnode(db, &node);
	return (result);
}

/*
 * Add SIG records for an RRset, recording the change in "diff".
 */
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add_sigs(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
	 dns_rdatatype_t type, dns_diff_t *diff, dst_key_t **keys,
	 unsigned int nkeys, isc_mem_t *mctx, isc_stdtime_t now,
	 isc_stdtime_t expire)
{
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	dns_dbnode_t *node = NULL;
	dns_rdataset_t rdataset;
	dns_rdata_t sig_rdata;
	isc_buffer_t buffer;
	unsigned char data[1024]; /* XXX */
	unsigned int i;

	dns_rdataset_init(&rdataset);
	isc_buffer_init(&buffer, data, sizeof data, ISC_BUFFERTYPE_BINARY);

	/* Get the rdataset to sign. */
	CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
	CHECK(dns_db_findrdataset(db, node, ver, type, 0,
				  (isc_stdtime_t) 0,
				  &rdataset, NULL));
	dns_db_detachnode(db, &node);	

	for (i = 0; i < nkeys; i++) {
		/* Calculate the signature, creating a SIG RDATA. */
		CHECK(dns_dnssec_sign(name, &rdataset, keys[i],
				      &now, &expire,
				      mctx, &buffer, &sig_rdata));

		/* Update the database and journal with the SIG. */
		/* XXX inefficient - will cause dataset merging */
		CHECK(update_one_rr(db, ver, diff, DNS_DIFFOP_ADD, name,
				    rdataset.ttl, &sig_rdata));
	}
		
 failure:
	if (dns_rdataset_isassociated(&rdataset))
		dns_rdataset_disassociate(&rdataset);
	if (node != NULL)
		dns_db_detachnode(db, &node);
	return (result);
} 

/*
 * Update SIG and NXT records affected by an update.  The original
 * update, including the SOA serial update but exluding the SIG & NXT 
 * changes, is in "diff" and has already been applied to "newver" of "db".
 * The database version prior to the update is "oldver".
 *
 * The necessary SIG and NXT changes will be applied to "newver"
 * and added (as a minimal diff) to "diff".
 */
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update_signatures(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *oldver,
		  dns_dbversion_t *newver, dns_diff_t *diff)
{
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	dns_difftuple_t *t;
	dns_diff_t diffnames;
	dns_diff_t affected;
	dns_diff_t sig_diff;
	dns_diff_t nxt_diff;
	dns_diff_t nxt_mindiff;
	isc_boolean_t flag;
	dst_key_t *zone_keys[MAXZONEKEYS];
	unsigned int nkeys = 0;
	unsigned int i;
	isc_stdtime_t now, expire;
	
	dns_diff_init(mctx, &diffnames);
	dns_diff_init(mctx, &affected);
	
	dns_diff_init(mctx, &sig_diff);
	dns_diff_init(mctx, &nxt_diff);
	dns_diff_init(mctx, &nxt_mindiff);

	result = find_zone_keys(db, newver, mctx, 
				MAXZONEKEYS, zone_keys, &nkeys);
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	if (result != DNS_R_SUCCESS) {
		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE,
			      NS_LOGMODULE_UPDATE, ISC_LOG_ERROR,
			      "could not get zone keys for secure "
			      "dynamic update");
		goto failure;
	}

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	isc_stdtime_get(&now);
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	expire = 100000 + now; /* XXX */
	
	/*
	 * Find all RRsets directly affected by the update, and 
	 * update their SIGs.  Also build a list of names affected
	 * by the update in "diffnames".
	 */
	CHECK(dns_diff_sort(diff, temp_order));

	t = ISC_LIST_HEAD(diff->tuples);
	while (t != NULL) {
		dns_name_t *name = &t->name;
		/* Now "name" is a new, unique name affected by the update. */

		CHECK(namelist_append_name(&diffnames, name));
		
		while (t != NULL && dns_name_equal(&t->name, name)) {
			dns_rdatatype_t type;
			type = t->rdata.type;

			/*
			 * Now "name" and "type" denote a new unique RRset
			 * affected by the update.  
			 */

			/* Don't sign SIGs. */
			if (type == dns_rdatatype_sig)
				goto skip;

			/*
			 * Delete all old SIGs covering this type, since they
			 * are all invalid when the signed RRset has changed.
			 * We may not be able to recreate all of them - tough. 
			 */
			CHECK(delete_if(true_p, db, newver, name,
					dns_rdatatype_sig, type,
					NULL, &sig_diff));

			/*
			 * If this RRset still exists after the update,
			 * add a new signature for it.
			 */
			CHECK(rrset_exists(db, newver, name, type, 0, &flag));
			if (flag) {
				CHECK(add_sigs(db, newver, name, type,
					       &sig_diff, zone_keys, nkeys,
					       mctx, now, expire));
			}
		skip:
			/* Skip any other updates to the same RRset. */
			while (t != NULL &&
			       dns_name_equal(&t->name, name) &&
			       t->rdata.type == type)
			{
				t = ISC_LIST_NEXT(t, link);
			}
		}
	}

	/* Remove orphaned NXTs and SIG NXTs. */
	for (t = ISC_LIST_HEAD(diffnames.tuples);
	     t != NULL;
	     t = ISC_LIST_NEXT(t, link))
	{
		CHECK(non_nxt_rrset_exists(db, newver, &t->name, &flag));
		if (! flag) {
			CHECK(delete_if(true_p, db, newver, &t->name,
					dns_rdatatype_any, 0,
					NULL, &sig_diff));
		}
	}

	/*
	 * When a name is created or deleted, its predecessor needs to 
	 * have its NXT updated.
	 */
	for (t = ISC_LIST_HEAD(diffnames.tuples);
	     t != NULL;
	     t = ISC_LIST_NEXT(t, link))
	{
		isc_boolean_t existed, exists;
		dns_fixedname_t fixedname;
		dns_name_t *prevname;

		dns_fixedname_init(&fixedname);
		prevname = dns_fixedname_name(&fixedname);

		CHECK(name_exists(db, oldver, &t->name, &existed));
		CHECK(name_exists(db, newver, &t->name, &exists));
		if (exists == existed)
			continue;

		/*
		 * Find the predecessor.
		 * When names become obscured or unobscured in this update
		 * transaction, we may find the wrong predecessor because
		 * the NXTs have not yet been updated to reflect the delegation
		 * change.  This should not matter because in this case,
		 * the correct predecessor is either the delegation node or
		 * a newly unobscured node, and those nodes are on the 
		 * "affected" list in any case.
		 */
		CHECK(next_active(db, newver, &t->name, prevname, ISC_FALSE));
		CHECK(namelist_append_name(&affected, prevname));
	}

	/* Find names affected by delegation changes. */
	for (t = ISC_LIST_HEAD(diffnames.tuples);
	     t != NULL;
	     t = ISC_LIST_NEXT(t, link))
	{
		isc_boolean_t existed, exists;

		CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_ns, 0,
				   &existed));
		CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ns, 0,
				   &exists));
		if (exists == existed)
			continue;
		/*
		 * There was a delegation change.  Mark all subdomains 
		 * of t->name as potentially needing a NXT update.
		 */
		CHECK(namelist_append_subdomain(db, &t->name, &affected));
	}

	ISC_LIST_APPENDLIST(affected.tuples, diffnames.tuples, link);
	INSIST(ISC_LIST_EMPTY(diffnames.tuples));
	
	CHECK(uniqify_name_list(&affected));
	
	/*
	 * Determine which names should have NXTs, and delete/create
	 * NXTs to make it so.  We don't know the final NXT targets yet,
	 * so we just create placeholder NXTs with arbitrary contents
	 * to indicate that their respective owner names should be part of
	 * the NXT chain.
	 */
	for (t = ISC_LIST_HEAD(affected.tuples);
	     t != NULL;
	     t = ISC_LIST_NEXT(t, link))
	{
		isc_boolean_t exists;
		CHECK(name_exists(db, newver, &t->name, &exists));
		if (! exists)
			continue;
		CHECK(is_glue(db, newver, &t->name, &flag));
		if (flag) {
			/*
			 * This name is obscured.  Delete any
			 * existing NXT record.
			 */
			CHECK(delete_if(true_p, db, newver, &t->name,
					dns_rdatatype_nxt, 0,
					NULL, &nxt_diff));
		} else {
			/* This name is not obscured.  It should have a NXT. */
			CHECK(rrset_exists(db, newver, &t->name,
					   dns_rdatatype_nxt, 0, &flag));
			if (! flag) {
				add_placeholder_nxt(db, newver, &t->name, diff);
			}
		}
	}
		
	/*
	 * Now we know which names are part of the NXT chain.
	 * Make them all point at their correct targets.
	 */
	for (t = ISC_LIST_HEAD(affected.tuples);
	     t != NULL;
	     t = ISC_LIST_NEXT(t, link))
	{
		CHECK(rrset_exists(db, newver, &t->name,
				   dns_rdatatype_nxt, 0, &flag));
		if (flag) {
			/*
			 * There is a NXT, but we don't know if it is correct.
			 * Delete it and create a correct one to be sure.
			 * If the update was unnecessary, the diff minimization
			 * will take care of eliminating it from the journal,
			 * IXFRs, etc.
			 *
			 * The SIG bit should always be set in the NXTs
			 * we generate, because they will all get SIG NXTs.
			 * (XXX what if the zone keys are missing?).
			 * Because the SIG NXTs have not necessarily been
			 * created yet, the correctness of the bit mask relies
			 * on the assumption that NXTs are only created if 
			 * there is other data, and if there is other data,
			 * there are other SIGs.
			 */
			CHECK(delete_if(true_p, db, newver, &t->name,
					dns_rdatatype_nxt, 0,
					NULL, &nxt_diff));
			CHECK(add_nxt(db, newver, &t->name, &nxt_diff));
		}
	}

	/*
	 * Minimize the set of NXT updates so that we don't
	 * have to regenerate the SIG NXTs for NXTs that were 
	 * replaced with identical ones.
	 */
	while ((t = ISC_LIST_HEAD(nxt_diff.tuples)) != NULL) {
		ISC_LIST_UNLINK(nxt_diff.tuples, t, link);
		dns_diff_appendminimal(&nxt_mindiff, &t);
	}

	/* Update SIG NXTs. */
	for (t = ISC_LIST_HEAD(nxt_mindiff.tuples);
	     t != NULL;
	     t = ISC_LIST_NEXT(t, link))
	{
		if (t->op == DNS_DIFFOP_DEL) {
			CHECK(delete_if(true_p, db, newver, &t->name,
					dns_rdatatype_sig, dns_rdatatype_nxt,
					NULL, &sig_diff));
		} else if (t->op == DNS_DIFFOP_ADD) {
			CHECK(add_sigs(db, newver, &t->name, dns_rdatatype_nxt,
				       &sig_diff, zone_keys, nkeys, mctx, now,
				       expire));
		} else {
			INSIST(0);
		}
	}

	/* Record our changes for the journal. */
	while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) {
		ISC_LIST_UNLINK(sig_diff.tuples, t, link);
		dns_diff_appendminimal(diff, &t);
	}
	while ((t = ISC_LIST_HEAD(nxt_mindiff.tuples)) != NULL) {
		ISC_LIST_UNLINK(nxt_mindiff.tuples, t, link);
		dns_diff_appendminimal(diff, &t);
	}

	INSIST(ISC_LIST_EMPTY(sig_diff.tuples));
	INSIST(ISC_LIST_EMPTY(nxt_diff.tuples));
	INSIST(ISC_LIST_EMPTY(nxt_mindiff.tuples));

 failure:
	dns_diff_clear(&sig_diff);
	dns_diff_clear(&nxt_diff);
	dns_diff_clear(&nxt_mindiff);

	dns_diff_clear(&affected);
	dns_diff_clear(&diffnames);

	for (i = 0; i < nkeys; i++) 
		dst_key_free(zone_keys[i]);
	
	return (result);
}	


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/**************************************************************************/
/*
 * The actual update code in all its glory.  We try to follow
 * the RFC2136 pseudocode as closely as possible.
 */

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static isc_result_t
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send_update_event(ns_client_t *client, dns_zone_t *zone) {
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	isc_result_t result = DNS_R_SUCCESS;
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	update_event_t *event = NULL;
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	isc_task_t *zonetask = NULL;
	
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	event = (update_event_t *)
		isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE,
				   update_action, client, sizeof(*event));
	if (event == NULL)
		FAIL(DNS_R_NOMEMORY);
	event->zone = zone;
	event->result = DNS_R_SUCCESS;

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	dns_zone_gettask(zone, &zonetask);
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	isc_task_send(zonetask, (isc_event_t **) &event);
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 failure:
	if (event != NULL)
		isc_event_free((isc_event_t **) &event);
	return (result);
}

static void
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respond(ns_client_t *client, isc_result_t result) {
	isc_result_t msg_result;
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	dns_message_t *response = NULL;
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	msg_result = dns_message_create(client->mctx, DNS_MESSAGE_INTENTRENDER,
					&response);
	if (msg_result != DNS_R_SUCCESS)
		goto msg_failure;
	
	response->id = client->message->id;
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	response->rcode = dns_result_torcode(result);
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	response->flags = client->message->flags;
	response->flags |= DNS_MESSAGEFLAG_QR;
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	response->opcode = client->message->opcode;
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	dns_message_destroy(&client->message);
	client->message = response;
	ns_client_send(client);
	return;
	
 msg_failure:
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	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE,
		      ISC_LOG_ERROR,
		      "could not create update response message: %s",
		      isc_result_totext(msg_result));
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	ns_client_next(client, msg_result);
}

void
ns_update_start(ns_client_t *client)
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{
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	dns_message_t *request = client->message;
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	isc_result_t result;
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	dns_name_t *zonename;
	dns_rdataset_t *zone_rdataset;
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	dns_zone_t *zone = NULL;
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	dns_rdataclass_t zoneclass;
	
	/*
	 * Interpret the zone section.
	 */
	result = dns_message_firstname(request, DNS_SECTION_ZONE);
	if (result != DNS_R_SUCCESS)
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		FAILC(DNS_R_FORMERR,
		      "update zone section empty");
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	/*
	 * The zone section must contain exactly one "question", and
	 * it must be of type SOA.
	 */
	zonename = NULL;
	dns_message_currentname(request, DNS_SECTION_ZONE, &zonename);
	zone_rdataset = ISC_LIST_HEAD(zonename->list);
	zoneclass = zone_rdataset->rdclass;
	if (zone_rdataset->type != dns_rdatatype_soa)
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		FAILC(DNS_R_FORMERR,
		      "update zone section contains non-SOA");
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	if (ISC_LIST_NEXT(zone_rdataset, link) != NULL)
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		FAILC(DNS_R_FORMERR,
		      "update zone section contains multiple RRs");
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	/* The zone section must have exactly one name. */
	result = dns_message_nextname(request, DNS_SECTION_ZONE);
	if (result != DNS_R_NOMORE)
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		FAILC(DNS_R_FORMERR,
		      "update zone section contains multiple RRs");
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	result = dns_zt_find(client->view->zonetable, zonename, NULL, &zone);
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	if (result != DNS_R_SUCCESS)
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		FAILC(DNS_R_NOTAUTH,
		      "not authoritative for update zone");
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	switch(dns_zone_gettype(zone)) {
	case dns_zone_master:
		CHECK(send_update_event(client, zone)); 
		break;	/* OK. */
	case dns_zone_slave:
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		FAILS(DNS_R_NOTIMP,
		      "update forwarding"); /* XXX implement */
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	default:
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		FAILC(DNS_R_NOTAUTH,
		      "not authoritative for update zone");
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	}
	return;
	
 failure:
	/*
	 * We failed without having sent an update event to the zone.