1/* referral.c - BDB backend referral handler */
2/* $OpenLDAP$ */
3/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 *
5 * Copyright 2000-2011 The OpenLDAP Foundation.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
10 * Public License.
11 *
12 * A copy of this license is available in the file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
15 */
16
17#include "portable.h"
18#include <stdio.h>
19#include <ac/string.h>
20
21#include "back-bdb.h"
22
23int
24bdb_referrals( Operation *op, SlapReply *rs )
25{
26	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
27	Entry *e = NULL;
28	EntryInfo *ei;
29	int rc = LDAP_SUCCESS;
30
31	DB_TXN		*rtxn;
32	DB_LOCK		lock;
33
34	if( op->o_tag == LDAP_REQ_SEARCH ) {
35		/* let search take care of itself */
36		return rc;
37	}
38
39	if( get_manageDSAit( op ) ) {
40		/* let op take care of DSA management */
41		return rc;
42	}
43
44	rc = bdb_reader_get(op, bdb->bi_dbenv, &rtxn);
45	switch(rc) {
46	case 0:
47		break;
48	default:
49		return LDAP_OTHER;
50	}
51
52dn2entry_retry:
53	/* get entry */
54	rc = bdb_dn2entry( op, rtxn, &op->o_req_ndn, &ei, 1, &lock );
55
56	/* bdb_dn2entry() may legally leave ei == NULL
57	 * if rc != 0 and rc != DB_NOTFOUND
58	 */
59	if ( ei ) {
60		e = ei->bei_e;
61	}
62
63	switch(rc) {
64	case DB_NOTFOUND:
65	case 0:
66		break;
67	case LDAP_BUSY:
68		rs->sr_text = "ldap server busy";
69		return LDAP_BUSY;
70	case DB_LOCK_DEADLOCK:
71	case DB_LOCK_NOTGRANTED:
72		goto dn2entry_retry;
73	default:
74		Debug( LDAP_DEBUG_TRACE,
75			LDAP_XSTRING(bdb_referrals)
76			": dn2entry failed: %s (%d)\n",
77			db_strerror(rc), rc, 0 );
78		rs->sr_text = "internal error";
79		return LDAP_OTHER;
80	}
81
82	if ( rc == DB_NOTFOUND ) {
83		rc = LDAP_SUCCESS;
84		rs->sr_matched = NULL;
85		if ( e != NULL ) {
86			Debug( LDAP_DEBUG_TRACE,
87				LDAP_XSTRING(bdb_referrals)
88				": tag=%lu target=\"%s\" matched=\"%s\"\n",
89				(unsigned long)op->o_tag, op->o_req_dn.bv_val, e->e_name.bv_val );
90
91			if( is_entry_referral( e ) ) {
92				BerVarray ref = get_entry_referrals( op, e );
93				rc = LDAP_OTHER;
94				rs->sr_ref = referral_rewrite( ref, &e->e_name,
95					&op->o_req_dn, LDAP_SCOPE_DEFAULT );
96				ber_bvarray_free( ref );
97				if ( rs->sr_ref ) {
98					rs->sr_matched = ber_strdup_x(
99					e->e_name.bv_val, op->o_tmpmemctx );
100				}
101			}
102
103			bdb_cache_return_entry_r (bdb, e, &lock);
104			e = NULL;
105		}
106
107		if( rs->sr_ref != NULL ) {
108			/* send referrals */
109			rc = rs->sr_err = LDAP_REFERRAL;
110			send_ldap_result( op, rs );
111			ber_bvarray_free( rs->sr_ref );
112			rs->sr_ref = NULL;
113		} else if ( rc != LDAP_SUCCESS ) {
114			rs->sr_text = rs->sr_matched ? "bad referral object" : NULL;
115		}
116
117		if (rs->sr_matched) {
118			op->o_tmpfree( (char *)rs->sr_matched, op->o_tmpmemctx );
119			rs->sr_matched = NULL;
120		}
121		return rc;
122	}
123
124	if ( is_entry_referral( e ) ) {
125		/* entry is a referral */
126		BerVarray refs = get_entry_referrals( op, e );
127		rs->sr_ref = referral_rewrite(
128			refs, &e->e_name, &op->o_req_dn, LDAP_SCOPE_DEFAULT );
129
130		Debug( LDAP_DEBUG_TRACE,
131			LDAP_XSTRING(bdb_referrals)
132			": tag=%lu target=\"%s\" matched=\"%s\"\n",
133			(unsigned long)op->o_tag, op->o_req_dn.bv_val, e->e_name.bv_val );
134
135		rs->sr_matched = e->e_name.bv_val;
136		if( rs->sr_ref != NULL ) {
137			rc = rs->sr_err = LDAP_REFERRAL;
138			send_ldap_result( op, rs );
139			ber_bvarray_free( rs->sr_ref );
140			rs->sr_ref = NULL;
141		} else {
142			rc = LDAP_OTHER;
143			rs->sr_text = "bad referral object";
144		}
145
146		rs->sr_matched = NULL;
147		ber_bvarray_free( refs );
148	}
149
150	bdb_cache_return_entry_r(bdb, e, &lock);
151	return rc;
152}
153