139 lines
5.4 KiB
C
139 lines
5.4 KiB
C
/**
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* @file
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* MDNS responder - output related functionalities
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*/
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/*
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* Copyright (c) 2015 Verisure Innovation AB
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Erik Ekman <erik@kryo.se>
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* Author: Jasper Verschueren <jasper.verschueren@apart-audio.com>
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*
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*/
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#ifndef LWIP_HDR_APPS_MDNS_OUT_H
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#define LWIP_HDR_APPS_MDNS_OUT_H
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#include "lwip/apps/mdns_opts.h"
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#include "lwip/apps/mdns_priv.h"
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#include "lwip/netif.h"
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#include "lwip/timeouts.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if LWIP_MDNS_RESPONDER
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/** Bitmasks outmsg generation */
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/* Probe for ALL types with hostname */
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#define QUESTION_PROBE_HOST_ANY 0x10
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/* Probe for ALL types with service instance name */
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#define QUESTION_PROBE_SERVICE_NAME_ANY 0x10
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/* Lookup from hostname -> IPv4 */
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#define REPLY_HOST_A 0x01
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/* Lookup from IPv4/v6 -> hostname */
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#define REPLY_HOST_PTR_V4 0x02
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/* Lookup from hostname -> IPv6 */
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#define REPLY_HOST_AAAA 0x04
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/* Lookup from hostname -> IPv6 */
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#define REPLY_HOST_PTR_V6 0x08
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/* Lookup for service types */
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#define REPLY_SERVICE_TYPE_PTR 0x10
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/* Lookup for instances of service */
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#define REPLY_SERVICE_NAME_PTR 0x20
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/* Lookup for location of service instance */
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#define REPLY_SERVICE_SRV 0x40
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/* Lookup for text info on service instance */
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#define REPLY_SERVICE_TXT 0x80
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/* RFC6762 section 6:
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* To protect the network against excessive packet flooding due to software bugs
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* or malicious attack, a Multicast DNS responder MUST NOT (except in the one
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* special case of answering probe queries) multicast a record on a given
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* interface until at least one second has elapsed since the last time that
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* record was multicast on that particular interface.
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*/
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#define MDNS_MULTICAST_TIMEOUT 1000
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/* RFC6762 section 6:
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* In this special case only, when responding via multicast to a probe, a
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* Multicast DNS responder is only required to delay its transmission as
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* necessary to ensure an interval of at least 250 ms since the last time the
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* record was multicast on that interface.
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*/
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#define MDNS_MULTICAST_PROBE_TIMEOUT 250
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/* RFC6762 section 5.4:
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* When receiving a question with the unicast-response bit set, a responder
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* SHOULD usually respond with a unicast packet directed back to the querier.
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* However, if the responder has not multicast that record recently (within one
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* quarter of its TTL), then the responder SHOULD instead multicast the response
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* so as to keep all the peer caches up to date, and to permit passive conflict
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* detection.
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* -> we implement a stripped down version. Depending on a timeout of 30s
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* (25% of 120s) all QU questions are send via multicast or unicast.
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*/
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#define MDNS_MULTICAST_TIMEOUT_25TTL 30000
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err_t mdns_create_outpacket(struct netif *netif, struct mdns_outmsg *msg,
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struct mdns_outpacket *outpkt);
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err_t mdns_send_outpacket(struct mdns_outmsg *msg, struct netif *netif);
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void mdns_set_timeout(struct netif *netif, u32_t msecs,
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sys_timeout_handler handler, u8_t *busy_flag);
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#if LWIP_IPV4
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void mdns_multicast_timeout_reset_ipv4(void *arg);
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void mdns_multicast_probe_timeout_reset_ipv4(void *arg);
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void mdns_multicast_timeout_25ttl_reset_ipv4(void *arg);
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void mdns_send_multicast_msg_delayed_ipv4(void *arg);
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void mdns_send_unicast_msg_delayed_ipv4(void *arg);
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void mdns_start_multicast_timeouts_ipv4(struct netif *netif);
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#endif
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#if LWIP_IPV6
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void mdns_multicast_timeout_reset_ipv6(void *arg);
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void mdns_multicast_probe_timeout_reset_ipv6(void *arg);
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void mdns_multicast_timeout_25ttl_reset_ipv6(void *arg);
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void mdns_send_multicast_msg_delayed_ipv6(void *arg);
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void mdns_send_unicast_msg_delayed_ipv6(void *arg);
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void mdns_start_multicast_timeouts_ipv6(struct netif *netif);
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#endif
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void mdns_prepare_txtdata(struct mdns_service *service);
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#ifdef LWIP_MDNS_SEARCH
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err_t mdns_send_request(struct mdns_request *req, struct netif *netif, const ip_addr_t *destination);
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#endif
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#endif /* LWIP_MDNS_RESPONDER */
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_HDR_APPS_MDNS_OUT_H */
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