mirror of https://github.com/getdnsapi/getdns.git
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
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* Functions for MDNS resolving.
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*/
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/*
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* Copyright (c) 2016 Christian Huitema <huitema@huitema.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef MDNS_H
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#define MDNS_H
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#ifdef HAVE_MDNS_SUPPORT
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#include "getdns/getdns.h"
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#include "types-internal.h"
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#include "util-internal.h"
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#include "platform.h"
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#include "util/lruhash.h"
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#include "config.h"
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getdns_return_t
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_getdns_submit_mdns_request(getdns_network_req *netreq);
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getdns_return_t
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_getdns_mdns_namespace_check(getdns_dns_req *dnsreq);
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/*
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* data structure for continuous queries
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*/
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typedef struct getdns_mdns_known_record
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{
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/* For storage in context->mdns_known_records_by_value */
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_getdns_rbnode_t node;
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uint64_t insertion_microsec;
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uint16_t record_type;
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uint16_t record_class;
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uint32_t ttl;
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int name_len;
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int record_data_len;
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uint8_t* name;
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uint8_t * record_data;
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} getdns_mdns_known_record;
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/*
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* Each entry in the hash table is keyed by type, class and name.
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* The key structure also contains the LRU hash entry structure.
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* The data part contains:
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* - 64 bit time stamp
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* - 32 bit word describing the record size
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* - 32 bit word describing teh allocated memory size
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* - valid DNS response, including 1 query and N answers, 0 AUTH, 0 AD.
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* For economy, the names of all answers are encoded using header compression, pointing
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* to the name in the query, i.e. offset 12 from beginning of message.
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* For stability, the names included in the data part of records are not compressed.
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*/
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typedef struct getdns_mdns_cached_key_header
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{
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/* embedded entry, for LRU hash */
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struct lruhash_entry entry;
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/* identification */
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uint16_t record_type;
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uint16_t record_class;
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int name_len;
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/* the octets following this structure contain the name */
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} getdns_mdns_cached_key_header;
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typedef struct getdns_mdns_cached_record_header
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{
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uint64_t insertion_microsec;
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uint32_t content_len;
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uint32_t allocated_length;
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/* list of user queries */
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getdns_network_req *netreq_first;
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} getdns_mdns_cached_record_header;
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typedef struct getdns_mdns_continuous_query
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{
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/* For storage in context->mdns_continuous_queries_by_name_rrtype */
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_getdns_rbnode_t node;
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uint8_t name[256]; /* binary representation of name being queried */
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int name_len;
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uint16_t request_class;
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uint16_t request_type;
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/* list of user queries */
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getdns_network_req *netreq_first;
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/* todo: do we need an expiration date, or a timer? */
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/* todo: do we need an update mark for showing last results? */
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} getdns_mdns_continuous_query;
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typedef struct mdns_network_connection
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{
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struct getdns_context* context;
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int fd;
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int addr_mcast_len;
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SOCKADDR_STORAGE addr_mcast;
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getdns_eventloop_event event;
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uint8_t response[1500];
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} mdns_network_connection;
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void _getdns_mdns_context_init(struct getdns_context *context);
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void _getdns_mdns_context_destroy(struct getdns_context *context);
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#endif /* HAVE_MDNS_SUPPORT */
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#endif /* MDNS_H */
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