forked from carlogiovanni/dnscrypt-plugins
/
empty-aaaa.c
73 lines (58 loc) · 1.66 KB
/
empty-aaaa.c
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/*
* Copy of
* dnscrypt-proxy/src/plugins/example-ldns-aaaa-blocking/example-ldns-aaaa-blocking.c
*
* Return empty request to AAAA queries. No parameters.
*/
#include <stdint.h>
#ifdef _WIN32
# include <ws2tcpip.h>
#endif
#include <dnscrypt/plugin.h>
#include <ldns/ldns.h>
#ifndef MERGED
DCPLUGIN_MAIN(__FILE__);
const char *
dcplugin_description(DCPlugin * const dcplugin)
{
return "Directly return an empty response to AAAA queries";
}
int
dcplugin_init(DCPlugin * const dcplugin, int argc, char *argv[])
{
(void) dcplugin;
(void) argc;
(void) argv;
return 0;
}
#endif /* MERGED */
static DCPluginSyncFilterResult
empty_aaa_sync_pre(DCPlugin *dcplugin, DCPluginDNSPacket *dcp_packet)
{
ldns_pkt *packet;
ldns_rr_list *questions;
uint8_t *wire_data;
DCPluginSyncFilterResult result = DCP_SYNC_FILTER_RESULT_OK;
wire_data = dcplugin_get_wire_data(dcp_packet);
ldns_wire2pkt(&packet, wire_data, dcplugin_get_wire_data_len(dcp_packet));
if (packet == NULL) {
return DCP_SYNC_FILTER_RESULT_ERROR;
}
questions = ldns_pkt_question(packet);
if (ldns_rr_list_rr_count(questions) == (size_t) 1U &&
ldns_rr_get_type(ldns_rr_list_rr(questions,
(size_t) 0U)) == LDNS_RR_TYPE_AAAA) {
LDNS_QR_SET(wire_data);
LDNS_RA_SET(wire_data);
result = DCP_SYNC_FILTER_RESULT_DIRECT;
}
ldns_pkt_free(packet);
return result;
}
#ifndef MERGED
DCPluginSyncFilterResult
dcplugin_sync_pre_filter(DCPlugin *dcplugin, DCPluginDNSPacket *dcp_packet)
{
return empty_aaa_sync_pre(dcplugin, dcp_packet);
}
#endif