/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2021 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */
/* Portions Copyright (c) 1995 Regents of the University of Michigan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of Michigan at Ann Arbor. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#include "portable.h"

#include <stdio.h>

#include <ac/string.h>
#include <ac/socket.h>

#include "lutil.h"
#include "slap.h"

int
do_search(
    Operation	*op,	/* info about the op to which we're responding */
    SlapReply	*rs	/* all the response data we'll send */ )
{
	struct berval base = BER_BVNULL;
	ber_len_t	siz, off, i;

	Debug( LDAP_DEBUG_TRACE, "%s do_search\n",
		op->o_log_prefix, 0, 0 );
	/*
	 * Parse the search request.  It looks like this:
	 *
	 *	SearchRequest := [APPLICATION 3] SEQUENCE {
	 *		baseObject	DistinguishedName,
	 *		scope		ENUMERATED {
	 *			baseObject	(0),
	 *			singleLevel	(1),
	 *			wholeSubtree (2),
	 *          subordinate (3)  -- OpenLDAP extension
	 *		},
	 *		derefAliases	ENUMERATED {
	 *			neverDerefaliases	(0),
	 *			derefInSearching	(1),
	 *			derefFindingBaseObj	(2),
	 *			alwaysDerefAliases	(3)
	 *		},
	 *		sizelimit	INTEGER (0 .. 65535),
	 *		timelimit	INTEGER (0 .. 65535),
	 *		attrsOnly	BOOLEAN,
	 *		filter		Filter,
	 *		attributes	SEQUENCE OF AttributeType
	 *	}
	 */

	/* baseObject, scope, derefAliases, sizelimit, timelimit, attrsOnly */
	if ( ber_scanf( op->o_ber, "{miiiib" /*}*/,
		&base, &op->ors_scope, &op->ors_deref, &op->ors_slimit,
	    &op->ors_tlimit, &op->ors_attrsonly ) == LBER_ERROR )
	{
		send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
		rs->sr_err = SLAPD_DISCONNECT;
		goto return_results;
	}

	if ( op->ors_tlimit < 0 || op->ors_tlimit > SLAP_MAX_LIMIT ) {
		send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "invalid time limit" );
		goto return_results;
	}

	if ( op->ors_slimit < 0 || op->ors_slimit > SLAP_MAX_LIMIT ) {
		send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "invalid size limit" );
		goto return_results;
	}

	switch( op->ors_scope ) {
	case LDAP_SCOPE_BASE:
	case LDAP_SCOPE_ONELEVEL:
	case LDAP_SCOPE_SUBTREE:
	case LDAP_SCOPE_SUBORDINATE:
		break;
	default:
		send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "invalid scope" );
		goto return_results;
	}

	switch( op->ors_deref ) {
	case LDAP_DEREF_NEVER:
	case LDAP_DEREF_FINDING:
	case LDAP_DEREF_SEARCHING:
	case LDAP_DEREF_ALWAYS:
		break;
	default:
		send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "invalid deref" );
		goto return_results;
	}

	rs->sr_err = dnPrettyNormal( NULL, &base, &op->o_req_dn, &op->o_req_ndn, op->o_tmpmemctx );
	if( rs->sr_err != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY, "%s do_search: invalid dn: \"%s\"\n",
			op->o_log_prefix, base.bv_val, 0 );
		send_ldap_error( op, rs, LDAP_INVALID_DN_SYNTAX, "invalid DN" );
		goto return_results;
	}

	Debug( LDAP_DEBUG_ARGS, "SRCH \"%s\" %d %d",
		base.bv_val, op->ors_scope, op->ors_deref );
	Debug( LDAP_DEBUG_ARGS, "    %d %d %d\n",
		op->ors_slimit, op->ors_tlimit, op->ors_attrsonly);

	/* filter - returns a "normalized" version */
	rs->sr_err = get_filter( op, op->o_ber, &op->ors_filter, &rs->sr_text );
	if( rs->sr_err != LDAP_SUCCESS ) {
		if( rs->sr_err == SLAPD_DISCONNECT ) {
			rs->sr_err = LDAP_PROTOCOL_ERROR;
			send_ldap_disconnect( op, rs );
			rs->sr_err = SLAPD_DISCONNECT;
		} else {
			send_ldap_result( op, rs );
		}
		goto return_results;
	}
	filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
	
	Debug( LDAP_DEBUG_ARGS, "    filter: %s\n",
		!BER_BVISEMPTY( &op->ors_filterstr ) ? op->ors_filterstr.bv_val : "empty", 0, 0 );

	/* attributes */
	siz = sizeof(AttributeName);
	off = offsetof(AttributeName,an_name);
	if ( ber_scanf( op->o_ber, "{M}}", &op->ors_attrs, &siz, off ) == LBER_ERROR ) {
		send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding attrs error" );
		rs->sr_err = SLAPD_DISCONNECT;
		goto return_results;
	}
	for ( i=0; i<siz; i++ ) {
		const char *dummy;	/* ignore msgs from bv2ad */
		op->ors_attrs[i].an_desc = NULL;
		op->ors_attrs[i].an_oc = NULL;
		op->ors_attrs[i].an_flags = 0;
		if ( slap_bv2ad( &op->ors_attrs[i].an_name,
			&op->ors_attrs[i].an_desc, &dummy ) != LDAP_SUCCESS )
		{
			if ( slap_bv2undef_ad( &op->ors_attrs[i].an_name,
				&op->ors_attrs[i].an_desc, &dummy,
				SLAP_AD_PROXIED|SLAP_AD_NOINSERT ) )
			{
				struct berval *bv = &op->ors_attrs[i].an_name;

				/* RFC 4511 LDAPv3: All User Attributes */
				if ( bvmatch( bv, slap_bv_all_user_attrs ) ) {
					continue;
				}

				/* RFC 3673 LDAPv3: All Operational Attributes */
				if ( bvmatch( bv, slap_bv_all_operational_attrs ) ) {
					continue;
				}

				/* RFC 4529 LDAP: Requesting Attributes by Object Class */
				if ( bv->bv_len > 1 && bv->bv_val[0] == '@' ) {
					/* FIXME: check if remaining is valid oc name? */
					continue;
				}

				/* add more "exceptions" to RFC 4511 4.5.1.8. */

				/* invalid attribute description? remove */
				if ( ad_keystring( bv ) ) {
					/* NOTE: parsed in-place, don't modify;
					 * rather add "1.1", which must be ignored */
					BER_BVSTR( &op->ors_attrs[i].an_name, LDAP_NO_ATTRS );
				}

				/* otherwise leave in place... */
			}
		}
	}

	if( get_ctrls( op, rs, 1 ) != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY, "%s do_search: get_ctrls failed\n",
			op->o_log_prefix, 0, 0 );
		goto return_results;
	}

	Debug( LDAP_DEBUG_ARGS, "    attrs:", 0, 0, 0 );

	if ( siz != 0 ) {
		for ( i = 0; i<siz; i++ ) {
			Debug( LDAP_DEBUG_ARGS, " %s", op->ors_attrs[i].an_name.bv_val, 0, 0 );
		}
	}

	Debug( LDAP_DEBUG_ARGS, "\n", 0, 0, 0 );

	if ( StatslogTest( LDAP_DEBUG_STATS ) ) {
		char abuf[BUFSIZ/2], *ptr = abuf;
		unsigned len = 0, alen;

		sprintf(abuf, "scope=%d deref=%d", op->ors_scope, op->ors_deref);
		Statslog( LDAP_DEBUG_STATS,
		        "%s SRCH base=\"%s\" %s filter=\"%s\"\n",
		        op->o_log_prefix, op->o_req_dn.bv_val, abuf,
		        op->ors_filterstr.bv_val, 0 );

		for ( i = 0; i<siz; i++ ) {
			alen = op->ors_attrs[i].an_name.bv_len;
			if (alen >= sizeof(abuf)) {
				alen = sizeof(abuf)-1;
			}
			if (len && (len + 1 + alen >= sizeof(abuf))) {
				Statslog( LDAP_DEBUG_STATS, "%s SRCH attr=%s\n",
				    op->o_log_prefix, abuf, 0, 0, 0 );
				len = 0;
				ptr = abuf;
			}
			if (len) {
				*ptr++ = ' ';
				len++;
			}
			ptr = lutil_strncopy(ptr, op->ors_attrs[i].an_name.bv_val, alen);
			len += alen;
			*ptr = '\0';
		}
		if (len) {
			Statslog( LDAP_DEBUG_STATS, "%s SRCH attr=%s\n",
	    			op->o_log_prefix, abuf, 0, 0, 0 );
		}
	}

	op->o_bd = frontendDB;
	rs->sr_err = frontendDB->be_search( op, rs );

return_results:;
	if ( !BER_BVISNULL( &op->o_req_dn ) ) {
		slap_sl_free( op->o_req_dn.bv_val, op->o_tmpmemctx );
	}
	if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
		slap_sl_free( op->o_req_ndn.bv_val, op->o_tmpmemctx );
	}
	if ( !BER_BVISNULL( &op->ors_filterstr ) ) {
		op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
	}
	if ( op->ors_filter != NULL) {
		filter_free_x( op, op->ors_filter, 1 );
	}
	if ( op->ors_attrs != NULL ) {
		op->o_tmpfree( op->ors_attrs, op->o_tmpmemctx );
	}

	return rs->sr_err;
}

int
fe_op_search( Operation *op, SlapReply *rs )
{
	BackendDB		*bd = op->o_bd;

	if ( op->ors_scope == LDAP_SCOPE_BASE ) {
		Entry *entry = NULL;

		if ( BER_BVISEMPTY( &op->o_req_ndn ) ) {
#ifdef LDAP_CONNECTIONLESS
			/* Ignore LDAPv2 CLDAP Root DSE queries */
			if (op->o_protocol == LDAP_VERSION2 && op->o_conn->c_is_udp) {
				goto return_results;
			}
#endif
			/* check restrictions */
			if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
				send_ldap_result( op, rs );
				goto return_results;
			}

			rs->sr_err = root_dse_info( op->o_conn, &entry, &rs->sr_text );

		} else if ( bvmatch( &op->o_req_ndn, &frontendDB->be_schemandn ) ) {
			/* check restrictions */
			if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
				send_ldap_result( op, rs );
				goto return_results;
			}

			rs->sr_err = schema_info( &entry, &rs->sr_text );
		}

		if( rs->sr_err != LDAP_SUCCESS ) {
			send_ldap_result( op, rs );
			goto return_results;

		} else if ( entry != NULL ) {
			if ( get_assert( op ) &&
				( test_filter( op, entry, get_assertion( op )) != LDAP_COMPARE_TRUE )) {
				rs->sr_err = LDAP_ASSERTION_FAILED;
				goto fail1;
			}

			rs->sr_err = test_filter( op, entry, op->ors_filter );

			if( rs->sr_err == LDAP_COMPARE_TRUE ) {
				/* note: we set no limits because either
				 * no limit is specified, or at least 1
				 * is specified, and we're going to return
				 * at most one entry */			
				op->ors_slimit = SLAP_NO_LIMIT;
				op->ors_tlimit = SLAP_NO_LIMIT;

				rs->sr_entry = entry;
				rs->sr_attrs = op->ors_attrs;
				rs->sr_operational_attrs = NULL;
				rs->sr_flags = 0;
				send_search_entry( op, rs );
				rs->sr_entry = NULL;
				rs->sr_operational_attrs = NULL;
			}
			rs->sr_err = LDAP_SUCCESS;
fail1:
			entry_free( entry );
			send_ldap_result( op, rs );
			goto return_results;
		}
	}

	if( BER_BVISEMPTY( &op->o_req_ndn ) && !BER_BVISEMPTY( &default_search_nbase ) ) {
		slap_sl_free( op->o_req_dn.bv_val, op->o_tmpmemctx );
		slap_sl_free( op->o_req_ndn.bv_val, op->o_tmpmemctx );

		ber_dupbv_x( &op->o_req_dn, &default_search_base, op->o_tmpmemctx );
		ber_dupbv_x( &op->o_req_ndn, &default_search_nbase, op->o_tmpmemctx );
	}

	/*
	 * We could be serving multiple database backends.  Select the
	 * appropriate one, or send a referral to our "referral server"
	 * if we don't hold it.
	 */

	op->o_bd = select_backend( &op->o_req_ndn, 1 );
	if ( op->o_bd == NULL ) {
		rs->sr_ref = referral_rewrite( default_referral,
			NULL, &op->o_req_dn, op->ors_scope );

		if (!rs->sr_ref) rs->sr_ref = default_referral;
		rs->sr_err = LDAP_REFERRAL;
		op->o_bd = bd;
		send_ldap_result( op, rs );

		if (rs->sr_ref != default_referral)
		ber_bvarray_free( rs->sr_ref );
		rs->sr_ref = NULL;
		goto return_results;
	}

	/* check restrictions */
	if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
		send_ldap_result( op, rs );
		goto return_results;
	}

	/* check for referrals */
	if( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
		goto return_results;
	}

	if ( SLAP_SHADOW(op->o_bd) && get_dontUseCopy(op) ) {
		/* don't use shadow copy */
		BerVarray defref = op->o_bd->be_update_refs
			? op->o_bd->be_update_refs : default_referral;

		if( defref != NULL ) {
			rs->sr_ref = referral_rewrite( defref,
				NULL, &op->o_req_dn, op->ors_scope );
			if( !rs->sr_ref) rs->sr_ref = defref;
			rs->sr_err = LDAP_REFERRAL;
			send_ldap_result( op, rs );

			if (rs->sr_ref != defref) ber_bvarray_free( rs->sr_ref );

		} else {
			send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
				"copy not used; no referral information available" );
		}

	} else if ( op->o_bd->be_search ) {
		if ( limits_check( op, rs ) == 0 ) {
			/* actually do the search and send the result(s) */
			(op->o_bd->be_search)( op, rs );
		}
		/* else limits_check() sends error */

	} else {
		send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
			"operation not supported within namingContext" );
	}

return_results:;
	op->o_bd = bd;
	return rs->sr_err;
}