Add referral generator

servers/slapd/back-dnssrv/referral.c

+/* referral.c - DNS SRV backend referral handler */
+/* $OpenLDAP$ */
+/*
+ * Copyright 2000 The OpenLDAP Foundation, All Rights Reserved.
+ * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/string.h>
+#include <ac/socket.h>
+
+#include "slap.h"
+#include "external.h"
+
+int
+dnssrv_back_referrals(
+    Backend	*be,
+    Connection	*conn,
+    Operation	*op,
+    const char *dn,
+    const char *ndn,
+	const char **text )
+{
+	int i;
+	int rc = LDAP_OTHER;
+	char *domain = NULL;
+	char *hostlist = NULL;
+	char **hosts = NULL;
+	struct berval **urls = NULL;
+
+	if( ndn == NULL || *ndn == '\0' ) {
+		*text = "operation upon null (empty) DN disallowed";
+		return LDAP_UNWILLING_TO_PERFORM;
+	}
+
+	if( get_manageDSAit( op ) ) {
+		if( op->o_tag == LDAP_REQ_SEARCH ) {
+			return LDAP_SUCCESS;
+		}
+
+		*text = "DNS SRV problem processing manageDSAit control";
+		return LDAP_OTHER;
+	} 
+
+	if( ldap_dn2domain( dn, &domain ) ) {
+		send_ldap_result( conn, op, LDAP_REFERRAL,
+			NULL, NULL, default_referral, NULL );
+		return LDAP_REFERRAL;
+	}
+
+	Debug( LDAP_DEBUG_TRACE, "DNSSRV: dn=\"%s\" -> domain=\"%s\"\n",
+		dn == NULL ? "" : dn,
+		domain == NULL ? "" : domain,
+		0 );
+
+	if( rc = ldap_domain2hostlist( domain, &hostlist ) ) {
+		Debug( LDAP_DEBUG_TRACE, "DNSSRV: domain2hostlist returned %d\n",
+			rc, 0, 0 );
+		*text = "no DNS SRV RR available for DN";
+		rc = LDAP_NO_SUCH_OBJECT;
+		goto done;
+	}
+
+	hosts = str2charray( hostlist, " " );
+
+	if( hosts == NULL ) {
+		Debug( LDAP_DEBUG_TRACE, "DNSSRV: str2charrary error\n", 0, 0, 0 );
+		*text = "problem processing DNS SRV records for DN";
+		goto done;
+	}
+
+	for( i=0; hosts[i] != NULL; i++) {
+		struct berval *url = ch_malloc( sizeof( struct berval ) ); 
+
+		url->bv_len = sizeof("ldap://")-1 + strlen(hosts[i]);
+		url->bv_val = ch_malloc( url->bv_len + 1 );
+
+		strcpy( url->bv_val, "ldap://" );
+		strcpy( &url->bv_val[sizeof("ldap://")-1], hosts[i] );
+
+		if( ber_bvecadd( &urls, url ) < 0 ) {
+			ber_bvfree( url );
+			*text = "problem processing DNS SRV records for DN";
+			goto done;
+		}
+	}
+
+	Statslog( LDAP_DEBUG_STATS,
+	    "conn=%ld op=%d DNSSRV p=%d dn=\"%s\" url=\"%s\"\n",
+	    op->o_connid, op->o_opid, op->o_protocol, dn, urls[0]->bv_val );
+
+	Debug( LDAP_DEBUG_TRACE, "DNSSRV: dn=\"%s\" -> url=\"%s\"\n",
+		dn == NULL ? "" : dn,
+		urls[0]->bv_val, 0 );
+
+	send_ldap_result( conn, op, rc = LDAP_REFERRAL,
+		NULL, "DNS SRV generated referrals", urls, NULL );
+
+done:
+	if( domain != NULL ) ch_free( domain );
+	if( hostlist != NULL ) ch_free( hostlist );
+	if( hosts != NULL ) charray_free( hosts );
+	ber_bvecfree( urls );
+	return rc;
+}