dns.h

opentcp-8052-1-0-4-1-src,包含了常用的网络协议

/*
 *Copyright (c) 2000-2002 Viola Systems Ltd.
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 *any, must include the following acknowledgment:
 *	"This product includes software developed by Viola 
 *	Systems (http://www.violasystems.com/)."
 *
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 *
 *OpenTCP is the unified open source TCP/IP stack available on a series 
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 *
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 */

/** \file dns.h
 *	\brief OpenTCP DNS interface file
 *	\author 
 *		\li Vladan Jovanovic ([e-mail])
 *	\version 1.0
 *	\date 10.9.2002
 * 	
 *	OpenTCP DNS protocol function declarations, constants, etc.
 */
#ifndef INCLUDE_DNS_H
#define INCLUDE_DNS_H

#include <inet/datatypes.h>


#define DNS_UDP_PORT	53	/**< DNS client will use this port 
							 *	 for sending and receiving of DNS packets
							 */

#define DNS_SERVER_IP	0xac100201  /**< DNS server's IP address */

#define DNS_RESEND_PERIOD	2			/**< Period in seconds for resending
										 * 	 DNS requests
										 */
#define DNS_NUM_RETRIES		5			/**< Number of retries that DNS
										 *	client will perform before
										 *	aborting name resolving
										 */

/* Events for event listener */
#define DNS_EVENT_ERROR				0	/**< Error event reported by DNS 
										 *	 client to event_listener
										 */
#define DNS_EVENT_SUCCESS			1	/**< Resolving successfull event
										 *	 reported by DNS client to 
										 *	 event_listener
										 */

/* First five errors (from RFC1035) which we transfer to event listener 
	plus a couple of our own
*/
#define DNS_ERROR_FORMAT			1	/**< The name server was unable to 
										 *	 interpret the query (RFC1035)
										 */
#define DNS_ERROR_SERVER_FAILURE	2	/**< The name server was unable to
										 *	 process this query due to a
										 *	 problem with the name server
										 *	 (RFC1035)
										 */
#define DNS_ERROR_NAME_ERROR		3	/**< Meaningful only for responses
										 *	 from an authoritative name
										 *	 server, this code signifies
										 *	 that the domain name referenced
										 *	 in the query does not exist
										 *	 (RFC1035)
										 */
#define DNS_ERROR_NOT_IMPLEMENTED	4	/**< The name server does not
										 *	 support the requested kind of
										 *	 query (RFC1035)
										 */
#define DNS_ERROR_REFUSED			5	/**< The name server refuses to
										 *	 perform the specified operation
										 *	 for policy reasons. (RFC 1035)
										 */
/* code 6-15 reserved for future use */
#define DNS_ERROR_TIMEOUT			16	/**< Timeout occured while DNS
										 *	 was trying to resolve the host
										 *	 name. New request should be
										 *	 issued if the address is needed
										 */
#define DNS_ERROR_GENERAL			17	/**< General (not specific) error
										 *	 occured while resolving host
										 *	 name.
										 */

/* Error codes returned from get_host_by_name(): */
/* Other error codes (besides those listed below) are:		
	-1 - general error
	-2 - arp not ready
	-3 - socket handle error
*/
#define DNS_ERROR_BUSY		-4	/**< Returned from get_host_by_name(): DNS
							     *	 client is currently busy with another
							     *	 request and is unable the process a new
							     *	 one
							     */
#define DNS_ERROR_LABEL		-5	/**< Returned from get_host_by_name(): Part 
								 *	 of the host name (label) consists of
								 *	 more than 63 characters.
								 */
#define DNS_ERROR_NAME		-6	/**< Returned from get_host_by_name(): Host
								 *	 name too long (more than 263 bytes)
								 */
#define DNS_ERROR_OVERFLOW	-7	/**< net_buf too small for the entire 
								 *	 DNS request to be stored in it.
								 */


UINT8 get_host_by_name(UINT8 *host_name_ptr,void (*listener)(UINT8 , UINT32 ));

void dns_init(void);

void dns_run(void);

INT32 dns_eventlistener(INT8 , UINT8 , UINT32 , UINT16 , UINT16 , UINT16);

#endif