1 /* $NetBSD: referral.c,v 1.3 2021/08/14 16:14:59 christos Exp $ */
2
3 /* referral.c - DNS SRV backend referral handler */
4 /* $OpenLDAP$ */
5 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
6 *
7 * Copyright 2000-2021 The OpenLDAP Foundation.
8 * Portions Copyright 2000-2003 Kurt D. Zeilenga.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted only as authorized by the OpenLDAP
13 * Public License.
14 *
15 * A copy of this license is available in the file LICENSE in the
16 * top-level directory of the distribution or, alternatively, at
17 * <http://www.OpenLDAP.org/license.html>.
18 */
19 /* ACKNOWLEDGEMENTS:
20 * This work was originally developed by Kurt D. Zeilenga for inclusion
21 * in OpenLDAP Software.
22 */
23
24 #include <sys/cdefs.h>
25 __RCSID("$NetBSD: referral.c,v 1.3 2021/08/14 16:14:59 christos Exp $");
26
27 #include "portable.h"
28
29 #include <stdio.h>
30
31 #include <ac/string.h>
32 #include <ac/socket.h>
33
34 #include "slap.h"
35 #include "proto-dnssrv.h"
36
37 int
dnssrv_back_referrals(Operation * op,SlapReply * rs)38 dnssrv_back_referrals(
39 Operation *op,
40 SlapReply *rs )
41 {
42 int i;
43 int rc = LDAP_OTHER;
44 char *domain = NULL;
45 char *hostlist = NULL;
46 char **hosts = NULL;
47 BerVarray urls = NULL;
48
49 if ( BER_BVISEMPTY( &op->o_req_dn ) ) {
50 /* FIXME: need some means to determine whether the database
51 * is a glue instance */
52 if ( SLAP_GLUE_INSTANCE( op->o_bd ) ) {
53 return LDAP_SUCCESS;
54 }
55
56 rs->sr_text = "DNS SRV operation upon null (empty) DN disallowed";
57 return LDAP_UNWILLING_TO_PERFORM;
58 }
59
60 if( get_manageDSAit( op ) ) {
61 if( op->o_tag == LDAP_REQ_SEARCH ) {
62 return LDAP_SUCCESS;
63 }
64
65 rs->sr_text = "DNS SRV problem processing manageDSAit control";
66 return LDAP_OTHER;
67 }
68
69 if( ldap_dn2domain( op->o_req_dn.bv_val, &domain ) || domain == NULL ) {
70 rs->sr_err = LDAP_REFERRAL;
71 rs->sr_ref = default_referral;
72 send_ldap_result( op, rs );
73 rs->sr_ref = NULL;
74 return LDAP_REFERRAL;
75 }
76
77 Debug( LDAP_DEBUG_TRACE, "DNSSRV: dn=\"%s\" -> domain=\"%s\"\n",
78 op->o_req_dn.bv_val, domain );
79
80 i = ldap_domain2hostlist( domain, &hostlist );
81 if ( i ) {
82 Debug( LDAP_DEBUG_TRACE,
83 "DNSSRV: domain2hostlist(%s) returned %d\n",
84 domain, i );
85 rs->sr_text = "no DNS SRV RR available for DN";
86 rc = LDAP_NO_SUCH_OBJECT;
87 goto done;
88 }
89
90 hosts = ldap_str2charray( hostlist, " " );
91
92 if( hosts == NULL ) {
93 Debug( LDAP_DEBUG_TRACE, "DNSSRV: str2charray error\n" );
94 rs->sr_text = "problem processing DNS SRV records for DN";
95 goto done;
96 }
97
98 for( i=0; hosts[i] != NULL; i++) {
99 struct berval url;
100
101 url.bv_len = STRLENOF( "ldap://" ) + strlen( hosts[i] );
102 url.bv_val = ch_malloc( url.bv_len + 1 );
103
104 strcpy( url.bv_val, "ldap://" );
105 strcpy( &url.bv_val[STRLENOF( "ldap://" )], hosts[i] );
106
107 if ( ber_bvarray_add( &urls, &url ) < 0 ) {
108 free( url.bv_val );
109 rs->sr_text = "problem processing DNS SRV records for DN";
110 goto done;
111 }
112 }
113
114 Debug( LDAP_DEBUG_STATS,
115 "%s DNSSRV p=%d dn=\"%s\" url=\"%s\"\n",
116 op->o_log_prefix, op->o_protocol,
117 op->o_req_dn.bv_val, urls[0].bv_val );
118
119 Debug( LDAP_DEBUG_TRACE, "DNSSRV: dn=\"%s\" -> url=\"%s\"\n",
120 op->o_req_dn.bv_val, urls[0].bv_val );
121
122 rs->sr_ref = urls;
123 send_ldap_error( op, rs, LDAP_REFERRAL,
124 "DNS SRV generated referrals" );
125 rs->sr_ref = NULL;
126 rc = LDAP_REFERRAL;
127
128 done:
129 if( domain != NULL ) ch_free( domain );
130 if( hostlist != NULL ) ch_free( hostlist );
131 if( hosts != NULL ) ldap_charray_free( hosts );
132 ber_bvarray_free( urls );
133 return rc;
134 }
135