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 } 130