external/bsd/openldap/dist/servers/slapd/back-dnssrv/referral.c

   1 /* referral.c - DNS SRV backend referral handler */
   2 /* $OpenLDAP: pkg/ldap/servers/slapd/back-dnssrv/referral.c,v 1.26.2.4 2008/02/11 23:26:46 kurt Exp $ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2000-2008 The OpenLDAP Foundation.
   6  * Portions Copyright 2000-2003 Kurt D. Zeilenga.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was originally developed by Kurt D. Zeilenga for inclusion
  19  * in OpenLDAP Software.
  20  */
  21
  22 #include "portable.h"
  23
  24 #include <stdio.h>
  25
  26 #include <ac/string.h>
  27 #include <ac/socket.h>
  28
  29 #include "slap.h"
  30 #include "proto-dnssrv.h"
  31
  32 int
  33 dnssrv_back_referrals(
  34     Operation   *op,
  35     SlapReply   *rs )
  36 {
  37         int i;
  38         int rc = LDAP_OTHER;
  39         char *domain = NULL;
  40         char *hostlist = NULL;
  41         char **hosts = NULL;
  42         BerVarray urls = NULL;
  43
  44         if ( BER_BVISEMPTY( &op->o_req_dn ) ) {
  45                 /* FIXME: need some means to determine whether the database
  46                  * is a glue instance */
  47                 if ( SLAP_GLUE_INSTANCE( op->o_bd ) ) {
  48                         return LDAP_SUCCESS;
  49                 }
  50
  51                 rs->sr_text = "DNS SRV operation upon null (empty) DN disallowed";
  52                 return LDAP_UNWILLING_TO_PERFORM;
  53         }
  54
  55         if( get_manageDSAit( op ) ) {
  56                 if( op->o_tag == LDAP_REQ_SEARCH ) {
  57                         return LDAP_SUCCESS;
  58                 }
  59
  60                 rs->sr_text = "DNS SRV problem processing manageDSAit control";
  61                 return LDAP_OTHER;
  62         }
  63
  64         if( ldap_dn2domain( op->o_req_dn.bv_val, &domain ) || domain == NULL ) {
  65                 rs->sr_err = LDAP_REFERRAL;
  66                 rs->sr_ref = default_referral;
  67                 send_ldap_result( op, rs );
  68                 rs->sr_ref = NULL;
  69                 return LDAP_REFERRAL;
  70         }
  71
  72         Debug( LDAP_DEBUG_TRACE, "DNSSRV: dn=\"%s\" -> domain=\"%s\"\n",
  73                 op->o_req_dn.bv_val, domain, 0 );
  74
  75         i = ldap_domain2hostlist( domain, &hostlist );
  76         if ( i ) {
  77                 Debug( LDAP_DEBUG_TRACE,
  78                         "DNSSRV: domain2hostlist(%s) returned %d\n",
  79                         domain, i, 0 );
  80                 rs->sr_text = "no DNS SRV RR available for DN";
  81                 rc = LDAP_NO_SUCH_OBJECT;
  82                 goto done;
  83         }
  84
  85         hosts = ldap_str2charray( hostlist, " " );
  86
  87         if( hosts == NULL ) {
  88                 Debug( LDAP_DEBUG_TRACE, "DNSSRV: str2charrary error\n", 0, 0, 0 );
  89                 rs->sr_text = "problem processing DNS SRV records for DN";
  90                 goto done;
  91         }
  92
  93         for( i=0; hosts[i] != NULL; i++) {
  94                 struct berval url;
  95
  96                 url.bv_len = STRLENOF( "ldap://" ) + strlen( hosts[i] );
  97                 url.bv_val = ch_malloc( url.bv_len + 1 );
  98
  99                 strcpy( url.bv_val, "ldap://" );
 100                 strcpy( &url.bv_val[STRLENOF( "ldap://" )], hosts[i] );
 101
 102                 if ( ber_bvarray_add( &urls, &url ) < 0 ) {
 103                         free( url.bv_val );
 104                         rs->sr_text = "problem processing DNS SRV records for DN";
 105                         goto done;
 106                 }
 107         }
 108
 109         Statslog( LDAP_DEBUG_STATS,
 110             "%s DNSSRV p=%d dn=\"%s\" url=\"%s\"\n",
 111             op->o_log_prefix, op->o_protocol,
 112                 op->o_req_dn.bv_val, urls[0].bv_val, 0 );
 113
 114         Debug( LDAP_DEBUG_TRACE, "DNSSRV: dn=\"%s\" -> url=\"%s\"\n",
 115                 op->o_req_dn.bv_val, urls[0].bv_val, 0 );
 116
 117         rs->sr_ref = urls;
 118         send_ldap_error( op, rs, LDAP_REFERRAL,
 119                 "DNS SRV generated referrals" );
 120         rs->sr_ref = NULL;
 121         rc = LDAP_REFERRAL;
 122
 123 done:
 124         if( domain != NULL ) ch_free( domain );
 125         if( hostlist != NULL ) ch_free( hostlist );
 126         if( hosts != NULL ) ldap_charray_free( hosts );
 127         ber_bvarray_free( urls );
 128         return rc;
 129 }