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586 lines
15 KiB
C
586 lines
15 KiB
C
/* deref.c - dereference overlay */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2015 The OpenLDAP Foundation.
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* Portions Copyright 2008 Pierangelo Masarati.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* ACKNOWLEDGEMENTS:
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* This work was initially developed by Pierangelo Masarati
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* for inclusion in OpenLDAP Software.
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*/
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#include "portable.h"
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#ifdef SLAPD_OVER_DEREF
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#include <stdio.h>
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#include "ac/string.h"
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#include "ac/socket.h"
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#include "slap.h"
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#include "config.h"
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#include "lutil.h"
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/*
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* 1. Specification
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*
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* 1.1. Request
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*
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* controlValue ::= SEQUENCE OF derefSpec DerefSpec
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*
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* DerefSpec ::= SEQUENCE {
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* derefAttr attributeDescription, ; DN-valued
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* attributes AttributeList }
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*
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* AttributeList ::= SEQUENCE OF attr AttributeDescription
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*
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* derefAttr MUST be unique within controlValue
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*
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*
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* 1.2. Response
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*
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* controlValue ::= SEQUENCE OF DerefRes
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*
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* From RFC 4511:
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* PartialAttribute ::= SEQUENCE {
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* type AttributeDescription,
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* vals SET OF value AttributeValue }
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*
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* PartialAttributeList ::= SEQUENCE OF
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* partialAttribute PartialAttribute
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*
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* DerefRes ::= SEQUENCE {
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* derefAttr AttributeDescription,
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* derefVal LDAPDN,
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* attrVals [0] PartialAttributeList OPTIONAL }
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*
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* If vals is empty, partialAttribute is omitted.
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* If all vals in attrVals are empty, attrVals is omitted.
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*
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* 2. Examples
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*
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* 2.1. Example
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*
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* 2.1.1. Request
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*
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* { { member, { GUID, SID } }, { memberOf, { GUID, SID } } }
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*
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* 2.1.2. Response
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*
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* { { memberOf, "cn=abartlet,cn=users,dc=abartlet,dc=net",
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* { { GUID, [ "0bc11d00-e431-40a0-8767-344a320142fa" ] },
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* { SID, [ "S-1-2-3-2345" ] } } },
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* { memberOf, "cn=ando,cn=users,dc=sys-net,dc=it",
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* { { GUID, [ "0bc11d00-e431-40a0-8767-344a320142fb" ] },
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* { SID, [ "S-1-2-3-2346" ] } } } }
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*
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* 2.2. Example
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*
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* 2.2.1. Request
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*
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* { { member, { cn, uid, drink } } }
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*
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* 2.2.2. Response
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*
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* { { member, "cn=ando,cn=users,dc=sys-net,dc=it",
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* { { cn, [ "ando", "Pierangelo Masarati" ] },
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* { uid, [ "ando" ] } } },
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* { member, "dc=sys-net,dc=it" } }
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*
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*
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* 3. Security considerations
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*
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* The control result must not disclose information the client's
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* identity could not have accessed directly by performing the related
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* search operations. The presence of a derefVal in the control
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* response does not imply neither the existence of nor any access
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* privilege to the corresponding entry. It is merely a consequence
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* of the read access the client's identity has on the corresponding
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* attribute's value.
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*/
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#define o_deref o_ctrlflag[deref_cid]
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#define o_ctrlderef o_controls[deref_cid]
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typedef struct DerefSpec {
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AttributeDescription *ds_derefAttr;
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AttributeDescription **ds_attributes;
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int ds_nattrs;
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struct DerefSpec *ds_next;
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} DerefSpec;
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typedef struct DerefVal {
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struct berval dv_derefSpecVal;
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BerVarray *dv_attrVals;
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} DerefVal;
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typedef struct DerefRes {
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DerefSpec dr_spec;
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DerefVal *dr_vals;
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struct DerefRes *dr_next;
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} DerefRes;
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typedef struct deref_cb_t {
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slap_overinst *dc_on;
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DerefSpec *dc_ds;
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} deref_cb_t;
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static int deref_cid;
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static slap_overinst deref;
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static int ov_count;
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static int
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deref_parseCtrl (
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Operation *op,
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SlapReply *rs,
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LDAPControl *ctrl )
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{
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ber_tag_t tag;
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BerElementBuffer berbuf;
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BerElement *ber = (BerElement *)&berbuf;
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ber_len_t len;
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char *last;
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DerefSpec *dshead = NULL, **dsp = &dshead;
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BerVarray attributes = NULL;
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if ( op->o_deref != SLAP_CONTROL_NONE ) {
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rs->sr_text = "Dereference control specified multiple times";
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return LDAP_PROTOCOL_ERROR;
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}
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if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
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rs->sr_text = "Dereference control value is absent";
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return LDAP_PROTOCOL_ERROR;
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}
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if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
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rs->sr_text = "Dereference control value is empty";
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return LDAP_PROTOCOL_ERROR;
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}
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ber_init2( ber, &ctrl->ldctl_value, 0 );
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for ( tag = ber_first_element( ber, &len, &last );
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tag != LBER_DEFAULT;
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tag = ber_next_element( ber, &len, last ) )
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{
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struct berval derefAttr;
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DerefSpec *ds, *dstmp;
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const char *text;
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int rc;
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ber_len_t cnt = sizeof(struct berval);
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ber_len_t off = 0;
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if ( ber_scanf( ber, "{m{M}}", &derefAttr, &attributes, &cnt, off ) == LBER_ERROR
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|| !cnt )
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{
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rs->sr_text = "Dereference control: derefSpec decoding error";
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rs->sr_err = LDAP_PROTOCOL_ERROR;
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goto done;
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}
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ds = (DerefSpec *)op->o_tmpcalloc( 1,
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sizeof(DerefSpec) + sizeof(AttributeDescription *)*(cnt + 1),
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op->o_tmpmemctx );
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ds->ds_attributes = (AttributeDescription **)&ds[ 1 ];
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ds->ds_nattrs = cnt;
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rc = slap_bv2ad( &derefAttr, &ds->ds_derefAttr, &text );
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if ( rc != LDAP_SUCCESS ) {
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rs->sr_text = "Dereference control: derefAttr decoding error";
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rs->sr_err = LDAP_PROTOCOL_ERROR;
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goto done;
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}
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for ( dstmp = dshead; dstmp && dstmp != ds; dstmp = dstmp->ds_next ) {
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if ( dstmp->ds_derefAttr == ds->ds_derefAttr ) {
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rs->sr_text = "Dereference control: derefAttr must be unique within control";
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rs->sr_err = LDAP_PROTOCOL_ERROR;
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goto done;
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}
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}
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if ( !( ds->ds_derefAttr->ad_type->sat_syntax->ssyn_flags & SLAP_SYNTAX_DN )) {
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if ( ctrl->ldctl_iscritical ) {
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rs->sr_text = "Dereference control: derefAttr syntax not distinguishedName";
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rs->sr_err = LDAP_PROTOCOL_ERROR;
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goto done;
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}
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rs->sr_err = LDAP_SUCCESS;
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goto justcleanup;
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}
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for ( cnt = 0; !BER_BVISNULL( &attributes[ cnt ] ); cnt++ ) {
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rc = slap_bv2ad( &attributes[ cnt ], &ds->ds_attributes[ cnt ], &text );
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if ( rc != LDAP_SUCCESS ) {
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rs->sr_text = "Dereference control: attribute decoding error";
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rs->sr_err = LDAP_PROTOCOL_ERROR;
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goto done;
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}
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}
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ber_memfree_x( attributes, op->o_tmpmemctx );
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attributes = NULL;
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*dsp = ds;
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dsp = &ds->ds_next;
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}
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op->o_ctrlderef = (void *)dshead;
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op->o_deref = ctrl->ldctl_iscritical
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? SLAP_CONTROL_CRITICAL
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: SLAP_CONTROL_NONCRITICAL;
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rs->sr_err = LDAP_SUCCESS;
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done:;
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if ( rs->sr_err != LDAP_SUCCESS ) {
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justcleanup:;
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for ( ; dshead; ) {
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DerefSpec *dsnext = dshead->ds_next;
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op->o_tmpfree( dshead, op->o_tmpmemctx );
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dshead = dsnext;
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}
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}
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if ( attributes != NULL ) {
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ber_memfree_x( attributes, op->o_tmpmemctx );
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}
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return rs->sr_err;
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}
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static int
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deref_cleanup( Operation *op, SlapReply *rs )
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{
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if ( rs->sr_type == REP_RESULT || rs->sr_err == SLAPD_ABANDON ) {
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op->o_tmpfree( op->o_callback, op->o_tmpmemctx );
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op->o_callback = NULL;
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op->o_tmpfree( op->o_ctrlderef, op->o_tmpmemctx );
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op->o_ctrlderef = NULL;
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}
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return SLAP_CB_CONTINUE;
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}
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static int
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deref_response( Operation *op, SlapReply *rs )
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{
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int rc = SLAP_CB_CONTINUE;
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if ( rs->sr_type == REP_SEARCH ) {
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BerElementBuffer berbuf;
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BerElement *ber = (BerElement *) &berbuf;
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deref_cb_t *dc = (deref_cb_t *)op->o_callback->sc_private;
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DerefSpec *ds;
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DerefRes *dr, *drhead = NULL, **drp = &drhead;
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struct berval bv = BER_BVNULL;
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int nDerefRes = 0, nDerefVals = 0, nAttrs = 0, nVals = 0;
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struct berval ctrlval;
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LDAPControl *ctrl, *ctrlsp[2];
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AccessControlState acl_state = ACL_STATE_INIT;
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static char dummy = '\0';
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Entry *ebase;
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int i;
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rc = overlay_entry_get_ov( op, &rs->sr_entry->e_nname, NULL, NULL, 0, &ebase, dc->dc_on );
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if ( rc != LDAP_SUCCESS || ebase == NULL ) {
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return SLAP_CB_CONTINUE;
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}
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for ( ds = dc->dc_ds; ds; ds = ds->ds_next ) {
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Attribute *a = attr_find( ebase->e_attrs, ds->ds_derefAttr );
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if ( a != NULL ) {
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DerefVal *dv;
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BerVarray *bva;
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if ( !access_allowed( op, rs->sr_entry, a->a_desc,
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NULL, ACL_READ, &acl_state ) )
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{
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continue;
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}
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dr = op->o_tmpcalloc( 1,
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sizeof( DerefRes ) + ( sizeof( DerefVal ) + sizeof( BerVarray * ) * ds->ds_nattrs ) * ( a->a_numvals + 1 ),
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op->o_tmpmemctx );
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dr->dr_spec = *ds;
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dv = dr->dr_vals = (DerefVal *)&dr[ 1 ];
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bva = (BerVarray *)&dv[ a->a_numvals + 1 ];
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bv.bv_len += ds->ds_derefAttr->ad_cname.bv_len;
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nAttrs++;
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nDerefRes++;
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for ( i = 0; !BER_BVISNULL( &a->a_nvals[ i ] ); i++ ) {
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Entry *e = NULL;
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dv[ i ].dv_attrVals = bva;
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bva += ds->ds_nattrs;
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if ( !access_allowed( op, rs->sr_entry, a->a_desc,
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&a->a_nvals[ i ], ACL_READ, &acl_state ) )
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{
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dv[ i ].dv_derefSpecVal.bv_val = &dummy;
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continue;
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}
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ber_dupbv_x( &dv[ i ].dv_derefSpecVal, &a->a_vals[ i ], op->o_tmpmemctx );
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bv.bv_len += dv[ i ].dv_derefSpecVal.bv_len;
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nVals++;
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nDerefVals++;
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rc = overlay_entry_get_ov( op, &a->a_nvals[ i ], NULL, NULL, 0, &e, dc->dc_on );
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if ( rc == LDAP_SUCCESS && e != NULL ) {
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int j;
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if ( access_allowed( op, e, slap_schema.si_ad_entry,
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NULL, ACL_READ, NULL ) )
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{
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for ( j = 0; j < ds->ds_nattrs; j++ ) {
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Attribute *aa;
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if ( !access_allowed( op, e, ds->ds_attributes[ j ], NULL,
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ACL_READ, &acl_state ) )
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{
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continue;
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}
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aa = attr_find( e->e_attrs, ds->ds_attributes[ j ] );
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if ( aa != NULL ) {
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unsigned k, h, last = aa->a_numvals;
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ber_bvarray_dup_x( &dv[ i ].dv_attrVals[ j ],
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aa->a_vals, op->o_tmpmemctx );
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bv.bv_len += ds->ds_attributes[ j ]->ad_cname.bv_len;
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for ( k = 0, h = 0; k < aa->a_numvals; k++ ) {
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if ( !access_allowed( op, e,
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aa->a_desc,
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&aa->a_nvals[ k ],
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ACL_READ, &acl_state ) )
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{
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op->o_tmpfree( dv[ i ].dv_attrVals[ j ][ h ].bv_val,
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op->o_tmpmemctx );
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dv[ i ].dv_attrVals[ j ][ h ] = dv[ i ].dv_attrVals[ j ][ --last ];
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BER_BVZERO( &dv[ i ].dv_attrVals[ j ][ last ] );
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continue;
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}
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bv.bv_len += dv[ i ].dv_attrVals[ j ][ h ].bv_len;
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nVals++;
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h++;
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}
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nAttrs++;
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}
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}
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}
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overlay_entry_release_ov( op, e, 0, dc->dc_on );
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}
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}
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*drp = dr;
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drp = &dr->dr_next;
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}
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}
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overlay_entry_release_ov( op, ebase, 0, dc->dc_on );
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if ( drhead == NULL ) {
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return SLAP_CB_CONTINUE;
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}
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/* cook the control value */
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bv.bv_len += nVals * sizeof(struct berval)
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+ nAttrs * sizeof(struct berval)
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+ nDerefVals * sizeof(DerefVal)
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+ nDerefRes * sizeof(DerefRes);
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bv.bv_val = op->o_tmpalloc( bv.bv_len, op->o_tmpmemctx );
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ber_init2( ber, &bv, LBER_USE_DER );
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ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
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rc = ber_printf( ber, "{" /*}*/ );
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for ( dr = drhead; dr != NULL; dr = dr->dr_next ) {
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for ( i = 0; !BER_BVISNULL( &dr->dr_vals[ i ].dv_derefSpecVal ); i++ ) {
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int j, first = 1;
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if ( dr->dr_vals[ i ].dv_derefSpecVal.bv_val == &dummy ) {
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continue;
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}
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rc = ber_printf( ber, "{OO" /*}*/,
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&dr->dr_spec.ds_derefAttr->ad_cname,
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&dr->dr_vals[ i ].dv_derefSpecVal );
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op->o_tmpfree( dr->dr_vals[ i ].dv_derefSpecVal.bv_val, op->o_tmpmemctx );
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for ( j = 0; j < dr->dr_spec.ds_nattrs; j++ ) {
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if ( dr->dr_vals[ i ].dv_attrVals[ j ] != NULL ) {
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if ( first ) {
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rc = ber_printf( ber, "t{" /*}*/,
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(LBER_CONSTRUCTED|LBER_CLASS_CONTEXT) );
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first = 0;
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}
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rc = ber_printf( ber, "{O[W]}",
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&dr->dr_spec.ds_attributes[ j ]->ad_cname,
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dr->dr_vals[ i ].dv_attrVals[ j ] );
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op->o_tmpfree( dr->dr_vals[ i ].dv_attrVals[ j ],
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op->o_tmpmemctx );
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}
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}
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if ( !first ) {
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rc = ber_printf( ber, /*{{*/ "}N}" );
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} else {
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rc = ber_printf( ber, /*{*/ "}" );
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}
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}
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}
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rc = ber_printf( ber, /*{*/ "}" );
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if ( ber_flatten2( ber, &ctrlval, 0 ) == -1 ) {
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if ( op->o_deref == SLAP_CONTROL_CRITICAL ) {
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rc = LDAP_CONSTRAINT_VIOLATION;
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} else {
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rc = SLAP_CB_CONTINUE;
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}
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goto cleanup;
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}
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ctrl = op->o_tmpcalloc( 1,
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sizeof( LDAPControl ) + ctrlval.bv_len + 1,
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op->o_tmpmemctx );
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ctrl->ldctl_value.bv_val = (char *)&ctrl[ 1 ];
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ctrl->ldctl_oid = LDAP_CONTROL_X_DEREF;
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ctrl->ldctl_iscritical = 0;
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ctrl->ldctl_value.bv_len = ctrlval.bv_len;
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AC_MEMCPY( ctrl->ldctl_value.bv_val, ctrlval.bv_val, ctrlval.bv_len );
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ctrl->ldctl_value.bv_val[ ctrl->ldctl_value.bv_len ] = '\0';
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ber_free_buf( ber );
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ctrlsp[0] = ctrl;
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ctrlsp[1] = NULL;
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slap_add_ctrls( op, rs, ctrlsp );
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rc = SLAP_CB_CONTINUE;
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cleanup:;
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/* release all */
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for ( ; drhead != NULL; ) {
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DerefRes *drnext = drhead->dr_next;
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op->o_tmpfree( drhead, op->o_tmpmemctx );
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drhead = drnext;
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}
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} else if ( rs->sr_type == REP_RESULT ) {
|
|
rc = deref_cleanup( op, rs );
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
deref_op_search( Operation *op, SlapReply *rs )
|
|
{
|
|
if ( op->o_deref ) {
|
|
slap_callback *sc;
|
|
deref_cb_t *dc;
|
|
|
|
sc = op->o_tmpcalloc( 1, sizeof( slap_callback ) + sizeof( deref_cb_t ), op->o_tmpmemctx );
|
|
|
|
dc = (deref_cb_t *)&sc[ 1 ];
|
|
dc->dc_on = (slap_overinst *)op->o_bd->bd_info;
|
|
dc->dc_ds = (DerefSpec *)op->o_ctrlderef;
|
|
|
|
sc->sc_response = deref_response;
|
|
sc->sc_cleanup = deref_cleanup;
|
|
sc->sc_private = (void *)dc;
|
|
|
|
sc->sc_next = op->o_callback->sc_next;
|
|
op->o_callback->sc_next = sc;
|
|
}
|
|
|
|
return SLAP_CB_CONTINUE;
|
|
}
|
|
|
|
static int
|
|
deref_db_init( BackendDB *be, ConfigReply *cr)
|
|
{
|
|
if ( ov_count == 0 ) {
|
|
int rc;
|
|
|
|
rc = register_supported_control2( LDAP_CONTROL_X_DEREF,
|
|
SLAP_CTRL_SEARCH,
|
|
NULL,
|
|
deref_parseCtrl,
|
|
1, /* replace */
|
|
&deref_cid );
|
|
if ( rc != LDAP_SUCCESS ) {
|
|
Debug( LDAP_DEBUG_ANY,
|
|
"deref_init: Failed to register control (%d)\n",
|
|
rc, 0, 0 );
|
|
return rc;
|
|
}
|
|
}
|
|
ov_count++;
|
|
return LDAP_SUCCESS;
|
|
}
|
|
|
|
static int
|
|
deref_db_open( BackendDB *be, ConfigReply *cr)
|
|
{
|
|
return overlay_register_control( be, LDAP_CONTROL_X_DEREF );
|
|
}
|
|
|
|
#ifdef SLAP_CONFIG_DELETE
|
|
static int
|
|
deref_db_destroy( BackendDB *be, ConfigReply *cr)
|
|
{
|
|
ov_count--;
|
|
overlay_unregister_control( be, LDAP_CONTROL_X_DEREF );
|
|
if ( ov_count == 0 ) {
|
|
unregister_supported_control( LDAP_CONTROL_X_DEREF );
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* SLAP_CONFIG_DELETE */
|
|
|
|
int
|
|
deref_initialize(void)
|
|
{
|
|
deref.on_bi.bi_type = "deref";
|
|
deref.on_bi.bi_db_init = deref_db_init;
|
|
deref.on_bi.bi_db_open = deref_db_open;
|
|
#ifdef SLAP_CONFIG_DELETE
|
|
deref.on_bi.bi_db_destroy = deref_db_destroy;
|
|
#endif /* SLAP_CONFIG_DELETE */
|
|
deref.on_bi.bi_op_search = deref_op_search;
|
|
|
|
return overlay_register( &deref );
|
|
}
|
|
|
|
#if SLAPD_OVER_DEREF == SLAPD_MOD_DYNAMIC
|
|
int
|
|
init_module( int argc, char *argv[] )
|
|
{
|
|
return deref_initialize();
|
|
}
|
|
#endif /* SLAPD_OVER_DEREF == SLAPD_MOD_DYNAMIC */
|
|
|
|
#endif /* SLAPD_OVER_DEREF */
|