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chaos.c
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chaos.c
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/*
* $Id$
*
* 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 <stdlib.h>
#include <stdio.h>
#include <evldns.h>
void nxdomain(evldns_server_request *srq, void *user_data, ldns_rdf *qname, ldns_rr_type qtype, ldns_rr_class qclass)
{
ldns_pkt *req = srq->request;
srq->response = evldns_response(req, LDNS_RCODE_NXDOMAIN);
}
/* rejects packets that arrive with OPCODE != QUERY, or QDCOUNT != 1 */
void query_only(evldns_server_request *srq, void *user_data, ldns_rdf *qname, ldns_rr_type qtype, ldns_rr_class qclass)
{
ldns_pkt *req = srq->request;
if (ldns_pkt_get_opcode(req) != LDNS_PACKET_QUERY) {
srq->response = evldns_response(req, LDNS_RCODE_NOTIMPL);
}
if (ldns_pkt_qdcount(req) != 1) {
srq->response = evldns_response(req, LDNS_RCODE_FORMERR);
}
}
int main(int argc, char *argv[])
{
struct event_base *base;
struct evldns_server *p;
evldns_callback myip, txt;
base = event_base_new();
evldns_init();
/* create an evldns server context */
p = evldns_add_server(base);
/* create sockets and add them to the context */
evldns_add_server_port(p, bind_to_udp4_port(5053));
evldns_add_server_port(p, bind_to_udp6_port(5053));
/* load a couple of plugins */
evldns_load_plugin(p, ".libs/mod_myip.so");
evldns_load_plugin(p, ".libs/mod_txtrec.so");
/* get plugin defined functions */
myip = evldns_get_function("myip");
txt = evldns_get_function("txt");
/* register a list of callbacks */
evldns_add_callback(p, NULL, LDNS_RR_CLASS_ANY, LDNS_RR_TYPE_ANY, query_only, NULL);
evldns_add_callback(p, "client.bind", LDNS_RR_CLASS_ANY, LDNS_RR_TYPE_ANY, myip, NULL);
evldns_add_callback(p, "version.bind", LDNS_RR_CLASS_CH, LDNS_RR_TYPE_TXT, txt, "evldns-0.2");
evldns_add_callback(p, "author.bind", LDNS_RR_CLASS_CH, LDNS_RR_TYPE_TXT, txt, "Ray Bellis, R&D Nominet UK");
evldns_add_callback(p, "*", LDNS_RR_CLASS_ANY, LDNS_RR_TYPE_ANY, nxdomain, NULL);
/* and set it running */
event_base_dispatch(base);
return EXIT_SUCCESS;
}