389-ds-base/ldap/servers/plugins/replication/repl5_agmtlist.c

/** BEGIN COPYRIGHT BLOCK
 * This Program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; version 2 of the License.
 * 
 * This Program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA.
 * 
 * In addition, as a special exception, Red Hat, Inc. gives You the additional
 * right to link the code of this Program with code not covered under the GNU
 * General Public License ("Non-GPL Code") and to distribute linked combinations
 * including the two, subject to the limitations in this paragraph. Non-GPL Code
 * permitted under this exception must only link to the code of this Program
 * through those well defined interfaces identified in the file named EXCEPTION
 * found in the source code files (the "Approved Interfaces"). The files of
 * Non-GPL Code may instantiate templates or use macros or inline functions from
 * the Approved Interfaces without causing the resulting work to be covered by
 * the GNU General Public License. Only Red Hat, Inc. may make changes or
 * additions to the list of Approved Interfaces. You must obey the GNU General
 * Public License in all respects for all of the Program code and other code used
 * in conjunction with the Program except the Non-GPL Code covered by this
 * exception. If you modify this file, you may extend this exception to your
 * version of the file, but you are not obligated to do so. If you do not wish to
 * provide this exception without modification, you must delete this exception
 * statement from your version and license this file solely under the GPL without
 * exception. 
 * 
 * 
 * Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
 * Copyright (C) 2005 Red Hat, Inc.
 * All rights reserved.
 * END COPYRIGHT BLOCK **/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

/* repl5_agmtlist.c */
/*

 Replication agreements are held in object set (objset.c).

*/

#include "repl5.h"

#define AGMT_CONFIG_BASE "cn=mapping tree, cn=config"
#define CONFIG_FILTER "(objectclass=nsds5replicationagreement)"
#define WINDOWS_CONFIG_FILTER "(objectclass=nsdsWindowsreplicationagreement)"
#define GLOBAL_CONFIG_FILTER "(|" CONFIG_FILTER WINDOWS_CONFIG_FILTER " )"


PRCallOnceType once = {0};
Objset *agmt_set = NULL; /* The set of replication agreements */

typedef struct agmt_wrapper {
	Repl_Agmt *agmt;
	void *handle;
} agmt_wrapper;



/*
 * Find the replication agreement whose entry DN matches the given DN.
 * Object is returned referenced, so be sure to release it when
 * finished.
 */
Repl_Agmt *
agmtlist_get_by_agmt_name(const Slapi_DN *agmt_name)
{
	Repl_Agmt *ra;
	Object *ro;

	for (ro = objset_first_obj(agmt_set); NULL != ro;
		ro = objset_next_obj(agmt_set, ro))
	{
		ra = (Repl_Agmt *)object_get_data(ro);
		if (agmt_matches_name(ra, agmt_name))
		{
			break;
		}
	}
	return ra;
}


static int
agmt_ptr_cmp(Object *ro, const void *arg)
{
	Repl_Agmt *ra;
	Repl_Agmt *provided_ra = (Repl_Agmt *)arg;

	ra = object_get_data(ro);

    if (ra == provided_ra)
        return 0;
    else
        return 1;
}



static int
agmt_dn_cmp(Object *ro, const void *arg)
{
	Repl_Agmt *ra;
	Slapi_DN *sdn = (Slapi_DN *)arg;

	ra = object_get_data(ro);
	return(slapi_sdn_compare(sdn, agmt_get_dn_byref(ra)));
}

void
agmtlist_release_agmt(Repl_Agmt *ra)
{
	Object *ro;

	PR_ASSERT(NULL != agmt_set);
	PR_ASSERT(NULL != ra);

	ro = objset_find(agmt_set, agmt_ptr_cmp, (const void *)ra);
	if (NULL != ro)
	{
		/*
		 * Release twice - once for the reference we got when finding
		 * it, and once for the reference we got when we called
		 * agmtlist_get_*().
		 */
		object_release(ro);
		object_release(ro);
	}
}


/*
 * Note: when we add the new object, we have a reference to it. We hold
 * on to this reference until the agreement is deleted (or until the
 * server is shut down).
 */
int
add_new_agreement(Slapi_Entry *e)
{
    int rc = 0;
    Repl_Agmt *ra = agmt_new_from_entry(e);
    Slapi_DN *replarea_sdn = NULL;
    Replica *replica = NULL;
    Object *repl_obj = NULL;
    Object *ro = NULL;

    if (ra == NULL) return 1; /* tell search result handler callback this entry was not sent */

    ro = object_new((void *)ra, agmt_delete);
    objset_add_obj(agmt_set, ro);
    object_release(ro); /* Object now owned by objset */

    /* get the replica for this agreement */
    replarea_sdn = agmt_get_replarea(ra);
    repl_obj = replica_get_replica_from_dn(replarea_sdn);
    slapi_sdn_free(&replarea_sdn);
    if (repl_obj) {
        replica = (Replica*)object_get_data (repl_obj);
    }

    rc = replica_start_agreement(replica, ra);

    if (repl_obj) object_release(repl_obj);

    return rc;
}

static int
agmtlist_add_callback(Slapi_PBlock *pb, Slapi_Entry *e, Slapi_Entry *entryAfter,
	int *returncode, char *returntext, void *arg)
{
	int rc;
	slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmt_add: begin\n");

	rc = add_new_agreement(e);
	if (0 != rc) {
		char *dn;
		slapi_pblock_get(pb, SLAPI_TARGET_DN, &dn);
		slapi_log_error(SLAPI_LOG_FATAL, repl_plugin_name, "agmtlist_add_callback: "
			"Can't start agreement \"%s\"\n", dn);
		*returncode = LDAP_UNWILLING_TO_PERFORM;
		return SLAPI_DSE_CALLBACK_ERROR;
	}
	*returncode = LDAP_SUCCESS;
	return SLAPI_DSE_CALLBACK_OK;
}

static int
agmtlist_modify_callback(Slapi_PBlock *pb, Slapi_Entry *entryBefore, Slapi_Entry *e,
	int *returncode, char *returntext, void *arg)
{
	int i;
    char *dn;
	Slapi_DN *sdn = NULL;
	int start_initialize = 0, stop_initialize = 0, cancel_initialize = 0;
    int update_the_schedule = 0;	/* do we need to update the repl sched? */
	Repl_Agmt *agmt = NULL;
	LDAPMod **mods;
    char buff [SLAPI_DSE_RETURNTEXT_SIZE];
    char *errortext = returntext ? returntext : buff;
    int rc = SLAPI_DSE_CALLBACK_OK;
    Slapi_Operation *op;
    void *identity;

    *returncode = LDAP_SUCCESS;

     /* just let internal operations originated from replication plugin to go through */
    slapi_pblock_get (pb, SLAPI_OPERATION, &op);
    slapi_pblock_get (pb, SLAPI_PLUGIN_IDENTITY, &identity);                

    if (operation_is_flag_set(op, OP_FLAG_INTERNAL) &&
        (identity == repl_get_plugin_identity (PLUGIN_MULTIMASTER_REPLICATION)))
    {
        goto done;
    }

    slapi_pblock_get(pb, SLAPI_TARGET_DN, &dn);
	sdn= slapi_sdn_new_dn_byref(dn);
	agmt = agmtlist_get_by_agmt_name(sdn);
	if (NULL == agmt)
	{
		slapi_log_error(SLAPI_LOG_FATAL, repl_plugin_name, "agmtlist_modify_callback: received "
			"a modification for unknown replication agreement \"%s\"\n", dn);
		goto done;
	}

	slapi_pblock_get(pb, SLAPI_MODIFY_MODS, &mods);
	for (i = 0; NULL != mods && NULL != mods[i]; i++)
	{
		if (slapi_attr_types_equivalent(mods[i]->mod_type, type_nsds5ReplicaInitialize))
		{
            /* we don't allow delete attribute operations unless it was issued by
               the replication plugin - handled above */
            if (mods[i]->mod_op & LDAP_MOD_DELETE)
            {                
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "deletion of %s attribute is not allowed\n", type_nsds5ReplicaInitialize);	
                *returncode = LDAP_UNWILLING_TO_PERFORM;
                rc = SLAPI_DSE_CALLBACK_ERROR;
                break;
            }
            else
            {
                char *val;

                if (mods[i]->mod_bvalues && mods[i]->mod_bvalues[0])
                    val = slapi_berval_get_string_copy (mods[i]->mod_bvalues[0]);
                else
                {
                    slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "no value provided for %s attribute\n", type_nsds5ReplicaInitialize);
                    *returncode = LDAP_UNWILLING_TO_PERFORM;
                    rc = SLAPI_DSE_CALLBACK_ERROR;
                    break;   
                }

			    /* Start replica initialization */
                if (val == NULL)
                {
                    PR_snprintf (errortext, SLAPI_DSE_RETURNTEXT_SIZE, "No value supplied for attr (%s)", mods[i]->mod_type);
                    slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: %s\n",
                                    errortext);	  
                    *returncode = LDAP_UNWILLING_TO_PERFORM;
                    rc = SLAPI_DSE_CALLBACK_ERROR;
                    break;
                }
            
                if (strcasecmp (val, "start") == 0)
                {                        
			        start_initialize = 1;
                }
                else if (strcasecmp (val, "stop") == 0)
                {
                    stop_initialize = 1;
                }
                else if (strcasecmp (val, "cancel") == 0)
                {
                    cancel_initialize = 1;
                }
                else
                {
                    PR_snprintf (errortext, SLAPI_DSE_RETURNTEXT_SIZE, "Invalid value (%s) value supplied for attr (%s)", 
                             val, mods[i]->mod_type);
                    slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: %s\n",
                                    errortext);	
                }
            
                slapi_ch_free ((void**)&val);
            }
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5ReplicaUpdateSchedule))
		{
			/*
			 * Request to update the replication schedule.  Set a flag so
			 * we know to update the schedule later.
			 */
			update_the_schedule = 1;
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5ReplicaCredentials))
		{
			/* New replica credentials */
			if (agmt_set_credentials_from_entry(agmt, e) != 0)
            {
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "failed to update credentials for agreement %s\n",
                                agmt_get_long_name(agmt));	
                *returncode = LDAP_OPERATIONS_ERROR;
                rc = SLAPI_DSE_CALLBACK_ERROR;
            }
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5ReplicaTimeout))
		{
			/* New replica timeout */
			if (agmt_set_timeout_from_entry(agmt, e) != 0)
            {
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "failed to update timeout for agreement %s\n",
                                agmt_get_long_name(agmt));	
                *returncode = LDAP_OPERATIONS_ERROR;
                rc = SLAPI_DSE_CALLBACK_ERROR;
            }
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5ReplicaBusyWaitTime))
		{
			/* New replica busywaittime */
			if (agmt_set_busywaittime_from_entry(agmt, e) != 0)
            {
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "failed to update busy wait time for agreement %s\n",
                                agmt_get_long_name(agmt));	
                *returncode = LDAP_OPERATIONS_ERROR;
                rc = SLAPI_DSE_CALLBACK_ERROR;
            }
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5ReplicaSessionPauseTime))
		{
			/* New replica pausetime */
			if (agmt_set_pausetime_from_entry(agmt, e) != 0)
            {
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "failed to update session pause time for agreement %s\n",
                                agmt_get_long_name(agmt));	
                *returncode = LDAP_OPERATIONS_ERROR;
                rc = SLAPI_DSE_CALLBACK_ERROR;
            }
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5ReplicaBindDN))
		{
			/* New replica Bind DN */
			if (agmt_set_binddn_from_entry(agmt, e) != 0)
            {
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "failed to update bind DN for agreement %s\n",
                                agmt_get_long_name(agmt));	
                *returncode = LDAP_OPERATIONS_ERROR;
                rc = SLAPI_DSE_CALLBACK_ERROR;
            }
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5TransportInfo))
		{
			/* New Transport info */
			if (agmt_set_transportinfo_from_entry(agmt, e) != 0)
            {
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "failed to update transport info for agreement %s\n",
                                agmt_get_long_name(agmt));	
                *returncode = LDAP_OPERATIONS_ERROR;
                rc = SLAPI_DSE_CALLBACK_ERROR;
            }
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5ReplicaBindMethod))
		{
			/* New replica bind method */
			if (agmt_set_bind_method_from_entry(agmt, e) != 0)
            {
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "failed to update bind method for agreement %s\n",
                                agmt_get_long_name(agmt));	
                *returncode = LDAP_OPERATIONS_ERROR;
                rc = SLAPI_DSE_CALLBACK_ERROR;
            }
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
					type_nsds5ReplicatedAttributeList))
		{
			char **denied_attrs = NULL;
			/* New set of excluded attributes */
			if (agmt_set_replicated_attributes_from_entry(agmt, e) != 0)
            {
                slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                                "failed to update replicated attributes for agreement %s\n",
                                agmt_get_long_name(agmt));	
                *returncode = LDAP_OPERATIONS_ERROR;
                rc = SLAPI_DSE_CALLBACK_ERROR;
            }
			/* Check that there are no verboten attributes in the exclude list */
			denied_attrs = agmt_validate_replicated_attributes(agmt);
			if (denied_attrs)
			{
				/* Report the error to the client */
				PR_snprintf (errortext, SLAPI_DSE_RETURNTEXT_SIZE, "attempt to exclude an illegal attribute in a fractional agreement");
				slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                            "attempt to exclude an illegal attribute in a fractional agreement\n");

				*returncode = LDAP_UNWILLING_TO_PERFORM;
				rc = SLAPI_DSE_CALLBACK_ERROR;
				/* Free the deny list if we got one */
				slapi_ch_array_free(denied_attrs);
				break;
			}
		}
		else if (slapi_attr_types_equivalent(mods[i]->mod_type,
											 "nsds5debugreplicatimeout"))
		{
			char *val = slapi_entry_attr_get_charptr(e, "nsds5debugreplicatimeout");
			repl5_set_debug_timeout(val);
			slapi_ch_free_string(&val);
		}
        else if (strcasecmp (mods[i]->mod_type, "modifytimestamp") == 0 ||
                 strcasecmp (mods[i]->mod_type, "modifiersname") == 0 ||
                 strcasecmp (mods[i]->mod_type, "description") == 0)
        {
            /* ignore modifier's name and timestamp attributes and the description. */
            continue;
        }
        else if (0 == windows_handle_modify_agreement(agmt, mods[i]->mod_type, e))
        {
            slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                            "modification of %s attribute is not allowed\n", mods[i]->mod_type);
            *returncode = LDAP_UNWILLING_TO_PERFORM;
            rc = SLAPI_DSE_CALLBACK_ERROR;
            break;
        }
	}

	if (stop_initialize)
	{
        agmt_stop (agmt);
    }
    else if (start_initialize)
    {
	if (agmt_initialize_replica(agmt) != 0) {
		/* The suffix is disabled */
		agmt_set_last_init_status(agmt, 0, NSDS50_REPL_DISABLED, NULL);
	}
    }
    else if (cancel_initialize)
    {
		agmt_replica_init_done(agmt);
	}

	if (update_the_schedule) 
    {
		if (agmt_set_schedule_from_entry(agmt, e) != 0)
        {
            slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_modify_callback: " 
                            "failed to update replication schedule for agreement %s\n",
                            agmt_get_long_name(agmt));	
            *returncode = LDAP_OPERATIONS_ERROR;
            rc = SLAPI_DSE_CALLBACK_ERROR;
        }
	}

done:
	if (NULL != agmt)
	{
		agmtlist_release_agmt(agmt);
	}

    if (sdn)
	    slapi_sdn_free(&sdn);
	return rc;
}

static int
agmtlist_delete_callback(Slapi_PBlock *pb, Slapi_Entry *e, Slapi_Entry *entryAfter,
	int *returncode, char *returntext, void *arg)
{
	Repl_Agmt *ra;
	Object *ro;

	slapi_log_error(SLAPI_LOG_FATAL, repl_plugin_name, "agmt_delete: begin\n");
	ro = objset_find(agmt_set, agmt_dn_cmp, (const void *)slapi_entry_get_sdn_const(e));
	ra = (NULL == ro) ? NULL : (Repl_Agmt *)object_get_data(ro);
	if (NULL == ra)
	{
		slapi_log_error(SLAPI_LOG_FATAL, repl_plugin_name, "agmtlist_delete: "
			"Tried to delete replication agreement \"%s\", but no such "
			"agreement was configured.\n", slapi_sdn_get_dn(slapi_entry_get_sdn_const(e)));
	}
	else
	{
		agmt_stop(ra);
		object_release(ro); /* Release ref acquired in objset_find */
		objset_remove_obj(agmt_set, ro); /* Releases a reference (should be final reference */
	}
	*returncode = LDAP_SUCCESS;
	return SLAPI_DSE_CALLBACK_OK;
}

static int
agmtlist_rename_callback(Slapi_PBlock *pb, Slapi_Entry *entryBefore, Slapi_Entry *e,
	int *returncode, char *returntext, void *arg)
{
	slapi_log_error(SLAPI_LOG_FATAL, repl_plugin_name, "agmt_rename: begin\n");

	*returncode = LDAP_SUCCESS;
	return SLAPI_DSE_CALLBACK_OK;
}


static int
handle_agmt_search(Slapi_Entry *e, void *callback_data)
{
	int *agmtcount = (int *)callback_data;
	int rc;

	slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name,
		"Found replication agreement named \"%s\".\n",
		slapi_sdn_get_dn(slapi_entry_get_sdn(e)));
	rc = add_new_agreement(e);
	if (0 == rc)
	{
		(*agmtcount)++;
	}
	else
	{
		slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "The replication "
			"agreement named \"%s\" could not be correctly parsed. No "
			"replication will occur with this replica.\n",
			slapi_sdn_get_dn(slapi_entry_get_sdn(e)));
	}

	return rc;
}


static void
agmtlist_objset_destructor(void **o)
{
	/* XXXggood Nothing to do, I think. */
}
	

int
agmtlist_config_init()
{
	Slapi_PBlock *pb;
	int agmtcount = 0;

	agmt_set = objset_new(agmtlist_objset_destructor);

	/* Register callbacks so we're informed about updates */
	slapi_config_register_callback(SLAPI_OPERATION_ADD, DSE_FLAG_PREOP, AGMT_CONFIG_BASE,
		LDAP_SCOPE_SUBTREE, GLOBAL_CONFIG_FILTER, agmtlist_add_callback, NULL);
	slapi_config_register_callback(SLAPI_OPERATION_MODIFY, DSE_FLAG_PREOP, AGMT_CONFIG_BASE,
		LDAP_SCOPE_SUBTREE, GLOBAL_CONFIG_FILTER, agmtlist_modify_callback, NULL);
	slapi_config_register_callback(SLAPI_OPERATION_DELETE, DSE_FLAG_PREOP, AGMT_CONFIG_BASE,
		LDAP_SCOPE_SUBTREE, GLOBAL_CONFIG_FILTER, agmtlist_delete_callback, NULL);
	slapi_config_register_callback(SLAPI_OPERATION_MODRDN, DSE_FLAG_PREOP, AGMT_CONFIG_BASE,
		LDAP_SCOPE_SUBTREE, GLOBAL_CONFIG_FILTER, agmtlist_rename_callback, NULL);

	/* Search the DIT and find all the replication agreements */
	pb = slapi_pblock_new();
	slapi_search_internal_set_pb(pb, AGMT_CONFIG_BASE, LDAP_SCOPE_SUBTREE,
		GLOBAL_CONFIG_FILTER, NULL /* attrs */, 0 /* attrsonly */,
		NULL, /* controls */ NULL /* uniqueid */,
		repl_get_plugin_identity(PLUGIN_MULTIMASTER_REPLICATION), 0 /* actions */);
	slapi_search_internal_callback_pb(pb,
		(void *)&agmtcount /* callback data */,
		NULL /* result_callback */,
		handle_agmt_search /* search entry cb */,
		NULL /* referral callback */);
	slapi_pblock_destroy(pb);

	slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name, "agmtlist_config_init: found %d replication agreements in DIT\n", agmtcount);

	return 0;
}



void
agmtlist_shutdown()
{
	Repl_Agmt *ra;
	Object *ro;
	Object *next_ro;

	ro = objset_first_obj(agmt_set);
	while (NULL != ro)
	{
		next_ro = objset_next_obj(agmt_set, ro);
		ra = (Repl_Agmt *)object_get_data(ro);
		agmt_stop(ra);
        agmt_update_consumer_ruv (ra);
		objset_remove_obj(agmt_set, ro);
		ro = next_ro;
	}
	objset_delete(&agmt_set);
	agmt_set = NULL;
}



/*
 * Notify each replication agreement about an update.
 */
void
agmtlist_notify_all(Slapi_PBlock *pb)
{
	Repl_Agmt *ra;
	Object *ro;

	if (NULL != agmt_set)
	{
		ro = objset_first_obj(agmt_set);
		while (NULL != ro)
		{
			ra = (Repl_Agmt *)object_get_data(ro);
			agmt_notify_change(ra, pb);
			ro = objset_next_obj(agmt_set, ro);
		}
	}
}

Object* agmtlist_get_first_agreement_for_replica (Replica *r)
{
    return agmtlist_get_next_agreement_for_replica (r, NULL)   ;
}

Object* agmtlist_get_next_agreement_for_replica (Replica *r, Object *prev)
{
    const Slapi_DN *replica_root;
    Slapi_DN *agmt_root;
    Object *obj;
    Repl_Agmt *agmt;

    if (r == NULL)
    {
        /* ONREPL - log error */
        return NULL;
    }

    replica_root = replica_get_root(r);  

    if (prev)
        obj = objset_next_obj(agmt_set, prev);   
    else
        obj = objset_first_obj(agmt_set);
        
    while (obj)
    {
        agmt = (Repl_Agmt*)object_get_data (obj);
        PR_ASSERT (agmt);

        agmt_root = agmt_get_replarea(agmt);
        PR_ASSERT (agmt_root);

        if (slapi_sdn_compare (replica_root, agmt_root) == 0)
        {
            slapi_sdn_free (&agmt_root);
            return obj;
        }

        slapi_sdn_free (&agmt_root);
        obj = objset_next_obj(agmt_set, obj);
    }

    return NULL;
}