/** 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

#include "cb.h"

static void cb_remove_illegal_mods(cb_backend_instance * inst, LDAPMod **mods);

/*
 * Perform a modify operation
 *
 * Returns:
 *   0  - success
 *   <0 - fail
 *
 */

int
chaining_back_modify ( Slapi_PBlock *pb )
{

	Slapi_Backend		*be;
	cb_backend_instance 	*cb;
	LDAPControl 		**ctrls, **serverctrls;
	int 			rc,parse_rc,msgid,i;
	LDAP 			*ld=NULL;
	char         		**referrals=NULL;
	LDAPMod			** mods;
	LDAPMessage		* res;
	const char 		*dn = NULL;
	Slapi_DN		*sdn = NULL;
	char 			*matched_msg, *error_msg;
	char 			*cnxerrbuf=NULL;
	time_t 			endtime = 0;
	cb_outgoing_conn	*cnx;

	if ( LDAP_SUCCESS != (rc=cb_forward_operation(pb) )) {
		cb_send_ldap_result( pb, rc, NULL, "Chaining forbidden", 0, NULL );
		return -1;
	}

	slapi_pblock_get( pb, SLAPI_BACKEND, &be );
	cb = cb_get_instance(be);

	cb_update_monitor_info(pb,cb,SLAPI_OPERATION_MODIFY);

	/* Check wether the chaining BE is available or not */
	if ( cb_check_availability( cb, pb ) == FARMSERVER_UNAVAILABLE ){
		return -1;
	}

	slapi_pblock_get( pb, SLAPI_MODIFY_TARGET_SDN, &sdn );
	dn = slapi_sdn_get_dn(sdn);

	if (cb_debug_on()) {
		slapi_log_error( SLAPI_LOG_PLUGIN, CB_PLUGIN_SUBSYSTEM,"modify: target:<%s>\n",dn);
	}


	ctrls=serverctrls=NULL;
	slapi_pblock_get( pb, SLAPI_MODIFY_MODS, &mods );
	slapi_pblock_get( pb, SLAPI_REQCONTROLS, &ctrls );

	/* Check acls				*/
	
	if ( cb->local_acl && !cb->associated_be_is_disabled ) {
		char * errbuf=NULL;
		Slapi_Entry *te = slapi_entry_alloc();
		slapi_entry_set_sdn(te, sdn); /* sdn: copied */
		rc = slapi_acl_check_mods( pb, te, mods, &errbuf);
		slapi_entry_free(te);

		if ( rc != LDAP_SUCCESS ) {
			cb_send_ldap_result( pb, rc, NULL, errbuf, 0, NULL );
			slapi_ch_free((void **)&errbuf);
			return -1;
		}
	}


	/* Grab a connection handle */
	rc = cb_get_connection(cb->pool, &ld, &cnx, NULL, &cnxerrbuf);
	if (LDAP_SUCCESS != rc) {
		static int warned_get_conn = 0;
		if (!warned_get_conn) {
			slapi_log_error(SLAPI_LOG_FATAL, CB_PLUGIN_SUBSYSTEM,
			                "cb_get_connection failed (%d) %s\n",
			                rc, ldap_err2string(rc));
			warned_get_conn = 1;
		}
		cb_send_ldap_result(pb, LDAP_OPERATIONS_ERROR, NULL,
		                    cnxerrbuf, 0, NULL);
		slapi_ch_free_string(&cnxerrbuf);
		/* ping the farm.
		 * If the farm is unreachable, we increment the counter */
		cb_ping_farm(cb, NULL, 0);
		return -1;
	}

	/* Control management */
        if ( (rc = cb_update_controls( pb,ld,&ctrls,CB_UPDATE_CONTROLS_ADDAUTH )) != LDAP_SUCCESS ) {
                cb_send_ldap_result( pb, rc, NULL,NULL, 0, NULL);
                cb_release_op_connection(cb->pool,ld,CB_LDAP_CONN_ERROR(rc));
                /* Don't free mods here: are freed at the do_modify level */
                return -1;
        }

        if ( slapi_op_abandoned( pb )) { 
                cb_release_op_connection(cb->pool,ld,0);
                /* Don't free mods here: are freed at the do_modify level */
		if ( NULL != ctrls)
                	ldap_controls_free(ctrls);
                return -1;
        } 

	/* Remove illegal attributes from the mods */
	cb_remove_illegal_mods(cb,mods);

	/* heart-beat management */
	if (cb->max_idle_time>0)
        	endtime=current_time() + cb->max_idle_time;

	/* Send LDAP operation to the remote host */
	rc = ldap_modify_ext( ld, dn, mods, ctrls, NULL, &msgid );
	if ( NULL != ctrls)
                ldap_controls_free(ctrls);

	if ( rc != LDAP_SUCCESS ) {
                cb_send_ldap_result( pb, LDAP_OPERATIONS_ERROR, NULL, ldap_err2string(rc), 0, NULL);
		cb_release_op_connection(cb->pool,ld,CB_LDAP_CONN_ERROR(rc));
                return -1;
	}

	while ( 1 ) {

                if (cb_check_forward_abandon(cb,pb,ld,msgid)) {
			/* connection handle released */
                        return -1;
		}

   		rc = ldap_result( ld, msgid, 0, &cb->abandon_timeout, &res );
   		switch ( rc ) {
   		case -1:
                	cb_send_ldap_result( pb, LDAP_OPERATIONS_ERROR, NULL,
                        	ldap_err2string(rc), 0, NULL);
			cb_release_op_connection(cb->pool,ld,CB_LDAP_CONN_ERROR(rc));
			if (res)
				ldap_msgfree(res);
                	return -1;
		case 0:
			if ((rc=cb_ping_farm(cb,cnx,endtime)) != LDAP_SUCCESS) {

				/* does not respond. give up and return a*/
				/* error to the client.			 */

               			/*cb_send_ldap_result(pb,LDAP_OPERATIONS_ERROR, NULL,
					ldap_err2string(rc), 0, NULL);*/
				cb_send_ldap_result(pb,LDAP_OPERATIONS_ERROR, NULL,     "FARM SERVER TEMPORARY UNAVAILABLE", 0, NULL);
				cb_release_op_connection(cb->pool,ld,CB_LDAP_CONN_ERROR(rc));
				if (res)
					ldap_msgfree(res);
               			return -1;
			}
#ifdef CB_YIELD
                        DS_Sleep(PR_INTERVAL_NO_WAIT);
#endif
                        break;
		default:

			matched_msg=error_msg=NULL;
			serverctrls=NULL;
			parse_rc = ldap_parse_result( ld, res, &rc, &matched_msg, 
			                          &error_msg, &referrals, &serverctrls, 1 );
			if ( parse_rc != LDAP_SUCCESS ) {
				static int warned_parse_rc = 0;
				if (!warned_parse_rc) {
					slapi_log_error( SLAPI_LOG_FATAL, CB_PLUGIN_SUBSYSTEM,
						            "%s%s%s\n", 
						            matched_msg?matched_msg:"",
						            (matched_msg&&(*matched_msg!='\0'))?": ":"",
					                ldap_err2string(parse_rc));
					warned_parse_rc = 1;
				}
				cb_send_ldap_result( pb, LDAP_OPERATIONS_ERROR, NULL,
				                     ENDUSERMSG, 0, NULL );
				cb_release_op_connection(cb->pool,ld,CB_LDAP_CONN_ERROR(parse_rc));
				slapi_ch_free((void **)&matched_msg);
				slapi_ch_free((void **)&error_msg);
				if (serverctrls)
					ldap_controls_free(serverctrls);
				/* jarnou: free referrals */
				if (referrals)
					charray_free(referrals);
				return -1;
			}

			if ( rc != LDAP_SUCCESS ) {
				struct berval ** refs =  referrals2berval(referrals); 
				static int warned_rc = 0;
				if (!warned_rc && error_msg) {
					slapi_log_error( SLAPI_LOG_FATAL, CB_PLUGIN_SUBSYSTEM,
						            "%s%s%s\n", 
						            matched_msg?matched_msg:"",
						            (matched_msg&&(*matched_msg!='\0'))?": ":"",
						            error_msg );
					warned_rc = 1;
				}
				cb_send_ldap_result( pb, rc, matched_msg, ENDUSERMSG, 0, refs);
				cb_release_op_connection(cb->pool,ld,CB_LDAP_CONN_ERROR(rc));
				slapi_ch_free((void **)&matched_msg);
				slapi_ch_free((void **)&error_msg);
				if (refs) 
					ber_bvecfree(refs);
				if (referrals) 
					charray_free(referrals);
				if (serverctrls)
				ldap_controls_free(serverctrls);
				return -1;
			}

			cb_release_op_connection(cb->pool,ld,0);

			/* Add control response sent by the farm server */

			for (i=0; serverctrls && serverctrls[i];i++)
        			slapi_pblock_set( pb, SLAPI_ADD_RESCONTROL, serverctrls[i]);
			/* SLAPI_ADD_RESCONTROL dups controls */
			if (serverctrls)
	                	ldap_controls_free(serverctrls);
			/* jarnou: free matched_msg, error_msg, and referrals if necessary */
		       	slapi_ch_free((void **)&matched_msg);
		       	slapi_ch_free((void **)&error_msg);
		       	if (referrals) 
		       		charray_free(referrals);
        		cb_send_ldap_result( pb, LDAP_SUCCESS, NULL, NULL, 0, NULL );
			return 0;
		}
	}

	/* Never reached */
	/* return 0; */
}

/* Function removes mods which are not allowed over-the-wire */
static void
cb_remove_illegal_mods(cb_backend_instance *inst, LDAPMod **mods)
{
        int             i, j;
        LDAPMod         *tmp;

	if ( inst->illegal_attributes != NULL ) {	/* Unlikely to happen */

        	slapi_rwlock_wrlock(inst->rwl_config_lock);

		for (j=0; inst->illegal_attributes[j]; j++) {
        		for ( i = 0; mods[i] != NULL; i++ ) {
				if (slapi_attr_types_equivalent(inst->illegal_attributes[j],mods[i]->mod_type)) {
                        		tmp = mods[i];
                        		for ( j = i; mods[j] != NULL; j++ ) {
                                		mods[j] = mods[j + 1];
                        		}
                        		slapi_ch_free( (void**)&(tmp->mod_type) );
                        		if ( tmp->mod_bvalues != NULL ) {
                                		ber_bvecfree( tmp->mod_bvalues );
                        		}
                        		slapi_ch_free( (void**)&tmp );
                        		i--;
				}
			}
		}

        	slapi_rwlock_unlock(inst->rwl_config_lock);
	}
}
