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//*****************************************************************************
//
//! \file dns.h
//! \brief DNS APIs Header file.
//! \details Send DNS query & Receive DNS reponse.
//! \version 1.1.0
//! \date 2013/11/18
//! \par Revision history
//! <2013/10/21> 1st Release
//! <2013/12/20> V1.1.0
//! 1. Remove secondary DNS server in DNS_run
//! If 1st DNS_run failed, call DNS_run with 2nd DNS again
//! 2. DNS_timerHandler -> DNS_time_handler
//! 3. Move the no reference define to dns.c
//! 4. Integrated dns.h dns.c & dns_parse.h dns_parse.c into dns.h & dns.c
//! <2013/12/20> V1.1.0
//!
//! \author Eric Jung & MidnightCow
//! \copyright
//!
//! Copyright (c) 2013, WIZnet Co., LTD.
//! All rights reserved.
//!
//! Redistribution and use in source and binary forms, with or without
//! modification, are permitted provided that the following conditions
//! are met:
//!
//! * Redistributions of source code must retain the above copyright
//! notice, this list of conditions and the following disclaimer.
//! * 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.
//! * Neither the name of the <ORGANIZATION> nor the names of its
//! contributors may be used to endorse or promote products derived
//! from this software without specific prior written permission.
//!
//! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
//
//*****************************************************************************
#ifndef _DNS_H_
#define _DNS_H_
#include <stdint.h>
/*
* @brief Define it for Debug & Monitor DNS processing.
* @note If defined, it depends on <stdio.h>
*/
//#define _DNS_DEBUG_
#define MAX_DNS_BUF_SIZE 256 ///< maximum size of DNS buffer. */
/*
* @brief Maximum length of your queried Domain name
* @todo SHOULD BE defined it equal as or greater than your Domain name length + null character(1)
* @note SHOULD BE careful to stack overflow because it is allocated 1.5 times as MAX_DOMAIN_NAME in stack.
*/
#define MAX_DOMAIN_NAME 32 // for example "www.google.com"
#define MAX_DNS_RETRY 2 ///< Requery Count
#define DNS_WAIT_TIME 4 ///< Wait response time. unit 1s.
#define IPPORT_DOMAIN 53 ///< DNS server port number
#define DNS_MSG_ID 0x1122 ///< ID for DNS message. You can be modified it any number
/*
* @brief DNS process initialize
* @param s : Socket number for DNS
* @param buf : Buffer for DNS message
*/
void DNS_init(uint8_t s, uint8_t * buf);
/*
* @brief DNS process
* @details Send DNS query and receive DNS response
* @param dns_ip : DNS server ip address
* @param name : Domain name to be queried
* @param ip_from_dns : IP address from DNS server
* @return -1 : failed. @ref MAX_DOMIN_NAME is too small \n
* 0 : failed (Timeout or Parse error)\n
* 1 : success
* @note This function blocks until success or fail. max time = @ref MAX_DNS_RETRY * @ref DNS_WAIT_TIME
*/
int8_t DNS_run(uint8_t * dns_ip, uint8_t * name, uint8_t * ip_from_dns);
#endif /* _DNS_H_ */
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