189 lines
6.3 KiB
C
189 lines
6.3 KiB
C
/* dnstap support for Unbound */
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/*
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* Copyright (c) 2013-2014, Farsight Security, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef UNBOUND_DNSTAP_H
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#define UNBOUND_DNSTAP_H
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#include "dnstap/dnstap_config.h"
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#ifdef USE_DNSTAP
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struct config_file;
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struct fstrm_io;
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struct fstrm_queue;
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struct sldns_buffer;
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struct dt_env {
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/** dnstap I/O thread */
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struct fstrm_iothr *iothr;
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/** dnstap I/O thread input queue */
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struct fstrm_iothr_queue *ioq;
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/** dnstap "identity" field, NULL if disabled */
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char *identity;
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/** dnstap "version" field, NULL if disabled */
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char *version;
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/** length of "identity" field */
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unsigned len_identity;
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/** length of "version" field */
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unsigned len_version;
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/** whether to log Message/RESOLVER_QUERY */
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unsigned log_resolver_query_messages : 1;
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/** whether to log Message/RESOLVER_RESPONSE */
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unsigned log_resolver_response_messages : 1;
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/** whether to log Message/CLIENT_QUERY */
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unsigned log_client_query_messages : 1;
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/** whether to log Message/CLIENT_RESPONSE */
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unsigned log_client_response_messages : 1;
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/** whether to log Message/FORWARDER_QUERY */
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unsigned log_forwarder_query_messages : 1;
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/** whether to log Message/FORWARDER_RESPONSE */
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unsigned log_forwarder_response_messages : 1;
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};
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/**
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* Create dnstap environment object. Afterwards, call dt_apply_cfg() to fill in
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* the config variables and dt_init() to fill in the per-worker state. Each
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* worker needs a copy of this object but with its own I/O queue (the fq field
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* of the structure) to ensure lock-free access to its own per-worker circular
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* queue. Duplicate the environment object if more than one worker needs to
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* share access to the dnstap I/O socket.
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* @param socket_path: path to dnstap logging socket, must be non-NULL.
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* @param num_workers: number of worker threads, must be > 0.
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* @return dt_env object, NULL on failure.
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*/
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struct dt_env *
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dt_create(const char *socket_path, unsigned num_workers);
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/**
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* Apply config settings.
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* @param env: dnstap environment object.
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* @param cfg: new config settings.
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*/
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void
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dt_apply_cfg(struct dt_env *env, struct config_file *cfg);
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/**
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* Initialize per-worker state in dnstap environment object.
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* @param env: dnstap environment object to initialize, created with dt_create().
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* @return: true on success, false on failure.
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*/
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int
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dt_init(struct dt_env *env);
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/**
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* Delete dnstap environment object. Closes dnstap I/O socket and deletes all
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* per-worker I/O queues.
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*/
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void
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dt_delete(struct dt_env *env);
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/**
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* Create and send a new dnstap "Message" event of type CLIENT_QUERY.
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* @param env: dnstap environment object.
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* @param qsock: address/port of client.
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* @param cptype: comm_udp or comm_tcp.
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* @param qmsg: query message.
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*/
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void
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dt_msg_send_client_query(struct dt_env *env,
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struct sockaddr_storage *qsock,
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enum comm_point_type cptype,
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struct sldns_buffer *qmsg);
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/**
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* Create and send a new dnstap "Message" event of type CLIENT_RESPONSE.
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* @param env: dnstap environment object.
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* @param qsock: address/port of client.
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* @param cptype: comm_udp or comm_tcp.
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* @param rmsg: response message.
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*/
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void
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dt_msg_send_client_response(struct dt_env *env,
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struct sockaddr_storage *qsock,
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enum comm_point_type cptype,
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struct sldns_buffer *rmsg);
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/**
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* Create and send a new dnstap "Message" event of type RESOLVER_QUERY or
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* FORWARDER_QUERY. The type used is dependent on the value of the RD bit
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* in the query header.
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* @param env: dnstap environment object.
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* @param rsock: address/port of server the query is being sent to.
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* @param cptype: comm_udp or comm_tcp.
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* @param zone: query zone.
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* @param zone_len: length of zone.
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* @param qmsg: query message.
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*/
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void
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dt_msg_send_outside_query(struct dt_env *env,
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struct sockaddr_storage *rsock,
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enum comm_point_type cptype,
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uint8_t *zone, size_t zone_len,
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struct sldns_buffer *qmsg);
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/**
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* Create and send a new dnstap "Message" event of type RESOLVER_RESPONSE or
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* FORWARDER_RESPONSE. The type used is dependent on the value of the RD bit
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* in the query header.
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* @param env: dnstap environment object.
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* @param rsock: address/port of server the response was received from.
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* @param cptype: comm_udp or comm_tcp.
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* @param zone: query zone.
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* @param zone_len: length of zone.
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* @param qbuf: outside_network's qbuf key.
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* @param qbuf_len: length of outside_network's qbuf key.
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* @param qtime: time query message was sent.
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* @param rtime: time response message was sent.
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* @param rmsg: response message.
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*/
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void
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dt_msg_send_outside_response(struct dt_env *env,
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struct sockaddr_storage *rsock,
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enum comm_point_type cptype,
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uint8_t *zone, size_t zone_len,
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uint8_t *qbuf, size_t qbuf_len,
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const struct timeval *qtime,
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const struct timeval *rtime,
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struct sldns_buffer *rmsg);
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#endif /* USE_DNSTAP */
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#endif /* UNBOUND_DNSTAP_H */
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