mod_txtrec.c

/*
 * $Id$
 *
 * Copyright (c) 2009, Nominet UK.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Nominet UK nor the names of its contributors may
 *       be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY Nominet UK ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Nominet UK BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <evldns.h>

/*
 * This callback functions just returns a TXT record containing
 * whatever string value was passed in the 'user_data' parameter
 * when the callback was added.
 */
static void txt_callback(evldns_server_request *srq, void *user_data, ldns_rdf *qname, ldns_rr_type qtype, ldns_rr_class qclass)
{
	ldns_pkt *req = srq->request;
	ldns_pkt *resp = evldns_response(req, LDNS_RCODE_NOERROR);
	ldns_rr *question = ldns_rr_list_rr(ldns_pkt_question(req), 0);
	ldns_rr *rr = ldns_rr_clone(question);

	ldns_rr_set_ttl(rr, 0L);
	ldns_rr_push_rdf(rr, ldns_rdf_new_frm_str(LDNS_RDF_TYPE_STR, user_data));
	ldns_rr_list_push_rr(ldns_pkt_answer(resp), rr);
	ldns_pkt_set_ancount(resp, 1);

	srq->response = resp;
}

int init(struct evldns_server *p)
{
	evldns_add_function("txt", txt_callback);

	return 0;
}