contiki/core/net/ip/resolv.h
2014-01-26 23:20:21 +01:00

110 lines
3.6 KiB
C

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