109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/**
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* \file
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* uIP DNS resolver code header file.
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* \author Adam Dunkels <adam@dunkels.com>
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*/
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/*
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* Copyright (c) 2002-2003, Adam Dunkels.
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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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* 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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* 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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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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*
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*/
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#ifndef RESOLV_H_
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#define RESOLV_H_
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#include "contiki.h"
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#include "uip.h"
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/** If RESOLV_CONF_SUPPORTS_MDNS is set, then queries
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* for domain names in the `local` TLD will use MDNS and
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* will respond to MDNS queries for this device's hostname,
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* as described by draft-cheshire-dnsext-multicastdns.
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*/
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#ifndef RESOLV_CONF_SUPPORTS_MDNS
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#define RESOLV_CONF_SUPPORTS_MDNS (1)
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#endif
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/**
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* Event that is broadcasted when a DNS name has been resolved.
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*/
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CCIF extern process_event_t resolv_event_found;
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/* Functions. */
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CCIF void resolv_conf(const uip_ipaddr_t * dnsserver);
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CCIF uip_ipaddr_t *resolv_getserver(void);
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enum {
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/** Hostname is fresh and usable. This response is cached and will eventually
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* expire to RESOLV_STATUS_EXPIRED.*/
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RESOLV_STATUS_CACHED = 0,
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/** Hostname was not found in the cache. Use resolv_query() to look it up. */
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RESOLV_STATUS_UNCACHED,
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/** Hostname was found, but it's status has expired. The address returned
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* should not be used. Use resolv_query() to freshen it up.
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*/
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RESOLV_STATUS_EXPIRED,
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/** The server has returned a not-found response for this domain name.
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* This response is cached for the period described in the server.
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* You may issue a new query at any time using resolv_query(), but
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* you will generally want to wait until this domain's status becomes
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* RESOLV_STATUS_EXPIRED.
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*/
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RESOLV_STATUS_NOT_FOUND,
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/** This hostname is in the process of being resolved. Try again soon. */
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RESOLV_STATUS_RESOLVING,
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/** Some sort of server error was encountered while trying to look up this
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* record. This response is cached and will eventually expire to
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* RESOLV_STATUS_EXPIRED.
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*/
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RESOLV_STATUS_ERROR,
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};
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typedef uint8_t resolv_status_t;
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CCIF resolv_status_t resolv_lookup(const char *name, uip_ipaddr_t ** ipaddr);
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CCIF void resolv_query(const char *name);
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#if RESOLV_CONF_SUPPORTS_MDNS
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CCIF void resolv_set_hostname(const char *hostname);
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CCIF const char *resolv_get_hostname(void);
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#endif
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PROCESS_NAME(resolv_process);
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#endif /* RESOLV_H_ */
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