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if/lwip/lwipNetDnsRequest.cpp@0:d616ece2d859, 2010-09-18 (annotated)

Committer:: mbed714
Date:: Sat Sep 18 23:05:49 2010 +0000
Revision:: 0:d616ece2d859

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User	Revision	Line number	New contents of line
mbed714	0:d616ece2d859	1
mbed714	0:d616ece2d859	2	/*
mbed714	0:d616ece2d859	3	Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
mbed714	0:d616ece2d859	4
mbed714	0:d616ece2d859	5	Permission is hereby granted, free of charge, to any person obtaining a copy
mbed714	0:d616ece2d859	6	of this software and associated documentation files (the "Software"), to deal
mbed714	0:d616ece2d859	7	in the Software without restriction, including without limitation the rights
mbed714	0:d616ece2d859	8	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mbed714	0:d616ece2d859	9	copies of the Software, and to permit persons to whom the Software is
mbed714	0:d616ece2d859	10	furnished to do so, subject to the following conditions:
mbed714	0:d616ece2d859	11
mbed714	0:d616ece2d859	12	The above copyright notice and this permission notice shall be included in
mbed714	0:d616ece2d859	13	all copies or substantial portions of the Software.
mbed714	0:d616ece2d859	14
mbed714	0:d616ece2d859	15	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mbed714	0:d616ece2d859	16	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mbed714	0:d616ece2d859	17	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mbed714	0:d616ece2d859	18	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mbed714	0:d616ece2d859	19	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mbed714	0:d616ece2d859	20	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
mbed714	0:d616ece2d859	21	THE SOFTWARE.
mbed714	0:d616ece2d859	22	*/
mbed714	0:d616ece2d859	23
mbed714	0:d616ece2d859	24	#include "lwipNetDnsRequest.h"
mbed714	0:d616ece2d859	25	#include "lwip/err.h" //err_t, ERR_xxx
mbed714	0:d616ece2d859	26	#include "lwip/dns.h"
mbed714	0:d616ece2d859	27
mbed714	0:d616ece2d859	28	#include "netCfg.h"
mbed714	0:d616ece2d859	29	#if NET_LWIP_STACK
mbed714	0:d616ece2d859	30
mbed714	0:d616ece2d859	31	//#define __DEBUG
mbed714	0:d616ece2d859	32	#include "dbg/dbg.h"
mbed714	0:d616ece2d859	33
mbed714	0:d616ece2d859	34	LwipNetDnsRequest::LwipNetDnsRequest(const char* hostname) : NetDnsRequest(hostname), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false)
mbed714	0:d616ece2d859	35	{
mbed714	0:d616ece2d859	36	DBG("New LwipNetDnsRequest %p\n", this);
mbed714	0:d616ece2d859	37	}
mbed714	0:d616ece2d859	38
mbed714	0:d616ece2d859	39	LwipNetDnsRequest::LwipNetDnsRequest(Host* pHost) : NetDnsRequest(pHost), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false)
mbed714	0:d616ece2d859	40	{
mbed714	0:d616ece2d859	41	DBG("New LwipNetDnsRequest %p\n", this);
mbed714	0:d616ece2d859	42	}
mbed714	0:d616ece2d859	43
mbed714	0:d616ece2d859	44	LwipNetDnsRequest::~LwipNetDnsRequest()
mbed714	0:d616ece2d859	45	{
mbed714	0:d616ece2d859	46	DBG("LwipNetDnsRequest %p destroyed\n", this);
mbed714	0:d616ece2d859	47	}
mbed714	0:d616ece2d859	48
mbed714	0:d616ece2d859	49	/*
mbed714	0:d616ece2d859	50	Main useful function here (see lwip/dns.h):
mbed714	0:d616ece2d859	51	err_t dns_gethostbyname(const char hostname, ip_addr_t addr,
mbed714	0:d616ece2d859	52	dns_found_callback found, void *callback_arg);
mbed714	0:d616ece2d859	53	*/
mbed714	0:d616ece2d859	54
mbed714	0:d616ece2d859	55	//Execute request & return OK if found, NOTFOUND or ERROR on error, or PROCESSING if the request has not completed yet
mbed714	0:d616ece2d859	56	void LwipNetDnsRequest::poll()
mbed714	0:d616ece2d859	57	{
mbed714	0:d616ece2d859	58	err_t err;
mbed714	0:d616ece2d859	59	switch(m_state)
mbed714	0:d616ece2d859	60	{
mbed714	0:d616ece2d859	61	case LWIPNETDNS_START: //First req, let's call dns_gethostbyname
mbed714	0:d616ece2d859	62	ip_addr_t ipStruct;
mbed714	0:d616ece2d859	63	err = dns_gethostbyname(m_hostname, &ipStruct, LwipNetDnsRequest::sFoundCb, (void*) this );
mbed714	0:d616ece2d859	64	if( err == ERR_OK )
mbed714	0:d616ece2d859	65	{
mbed714	0:d616ece2d859	66	m_ip = IpAddr(&ipStruct);
mbed714	0:d616ece2d859	67	m_state = LWIPNETDNS_OK;
mbed714	0:d616ece2d859	68	DBG("DNS: Ip found in cache.\n");
mbed714	0:d616ece2d859	69	}
mbed714	0:d616ece2d859	70	else if( err == ERR_INPROGRESS)
mbed714	0:d616ece2d859	71	{
mbed714	0:d616ece2d859	72	DBG("DNS: Processing.\n");
mbed714	0:d616ece2d859	73	m_state = LWIPNETDNS_PROCESSING;
mbed714	0:d616ece2d859	74	}
mbed714	0:d616ece2d859	75	else //Likely ERR_VAL
mbed714	0:d616ece2d859	76	{
mbed714	0:d616ece2d859	77	DBG("DNS: Error on init.\n");
mbed714	0:d616ece2d859	78	m_state = LWIPNETDNS_ERROR;
mbed714	0:d616ece2d859	79	}
mbed714	0:d616ece2d859	80	break;
mbed714	0:d616ece2d859	81	case LWIPNETDNS_PROCESSING:
mbed714	0:d616ece2d859	82	break; //Nothing to do, DNS is polled on interrupt
mbed714	0:d616ece2d859	83	case LWIPNETDNS_OK:
mbed714	0:d616ece2d859	84	if(!m_cbFired)
mbed714	0:d616ece2d859	85	{
mbed714	0:d616ece2d859	86	DBG("DNS: Ip found.\n");
mbed714	0:d616ece2d859	87	m_cbFired = true;
mbed714	0:d616ece2d859	88	onReply(NETDNS_FOUND); //Raise callback
mbed714	0:d616ece2d859	89	}
mbed714	0:d616ece2d859	90	break;
mbed714	0:d616ece2d859	91	case LWIPNETDNS_NOTFOUND:
mbed714	0:d616ece2d859	92	if(!m_cbFired)
mbed714	0:d616ece2d859	93	{
mbed714	0:d616ece2d859	94	DBG("DNS: could not be resolved.\n");
mbed714	0:d616ece2d859	95	m_cbFired = true;
mbed714	0:d616ece2d859	96	onReply(NETDNS_NOTFOUND); //Raise callback
mbed714	0:d616ece2d859	97	}
mbed714	0:d616ece2d859	98	break;
mbed714	0:d616ece2d859	99	case LWIPNETDNS_ERROR:
mbed714	0:d616ece2d859	100	default:
mbed714	0:d616ece2d859	101	if(!m_cbFired)
mbed714	0:d616ece2d859	102	{
mbed714	0:d616ece2d859	103	DBG("DNS: Error.\n");
mbed714	0:d616ece2d859	104	m_cbFired = true;
mbed714	0:d616ece2d859	105	onReply(NETDNS_ERROR); //Raise callback
mbed714	0:d616ece2d859	106	}
mbed714	0:d616ece2d859	107	break;
mbed714	0:d616ece2d859	108	}
mbed714	0:d616ece2d859	109	if(m_closing && (m_state!=LWIPNETDNS_PROCESSING)) //Check wether the closure has been reqd
mbed714	0:d616ece2d859	110	{
mbed714	0:d616ece2d859	111	DBG("LwipNetDnsRequest: Closing in poll()\n");
mbed714	0:d616ece2d859	112	NetDnsRequest::close();
mbed714	0:d616ece2d859	113	}
mbed714	0:d616ece2d859	114	}
mbed714	0:d616ece2d859	115
mbed714	0:d616ece2d859	116	void LwipNetDnsRequest::close()
mbed714	0:d616ece2d859	117	{
mbed714	0:d616ece2d859	118	DBG("LwipNetDnsRequest: Close req\n");
mbed714	0:d616ece2d859	119	if(m_state!=LWIPNETDNS_PROCESSING)
mbed714	0:d616ece2d859	120	{
mbed714	0:d616ece2d859	121	DBG("LwipNetDnsRequest: Closing in close()\n");
mbed714	0:d616ece2d859	122	NetDnsRequest::close();
mbed714	0:d616ece2d859	123	}
mbed714	0:d616ece2d859	124	else //Cannot close rightaway, waiting for callback from underlying layer
mbed714	0:d616ece2d859	125	{
mbed714	0:d616ece2d859	126	m_closing = true;
mbed714	0:d616ece2d859	127	}
mbed714	0:d616ece2d859	128	}
mbed714	0:d616ece2d859	129
mbed714	0:d616ece2d859	130	void LwipNetDnsRequest::foundCb(const char name, ip_addr_t ipaddr)
mbed714	0:d616ece2d859	131	{
mbed714	0:d616ece2d859	132	if( ipaddr == NULL )
mbed714	0:d616ece2d859	133	{
mbed714	0:d616ece2d859	134	DBG("LwipNetDnsRequest: Callback: Name not found\n");
mbed714	0:d616ece2d859	135	m_state = LWIPNETDNS_NOTFOUND;
mbed714	0:d616ece2d859	136	return;
mbed714	0:d616ece2d859	137	}
mbed714	0:d616ece2d859	138	DBG("LwipNetDnsRequest: Callback: Resolved\n");
mbed714	0:d616ece2d859	139	m_ip = IpAddr(ipaddr);
mbed714	0:d616ece2d859	140	m_state = LWIPNETDNS_OK;
mbed714	0:d616ece2d859	141	}
mbed714	0:d616ece2d859	142
mbed714	0:d616ece2d859	143
mbed714	0:d616ece2d859	144	void LwipNetDnsRequest::sFoundCb(const char name, ip_addr_t ipaddr, void *arg)
mbed714	0:d616ece2d859	145	{
mbed714	0:d616ece2d859	146	DBG("LwipNetDnsRequest: Static callback\n");
mbed714	0:d616ece2d859	147	LwipNetDnsRequest* pMe = (LwipNetDnsRequest*) arg;
mbed714	0:d616ece2d859	148	return pMe->foundCb( name, ipaddr );
mbed714	0:d616ece2d859	149	}
mbed714	0:d616ece2d859	150
mbed714	0:d616ece2d859	151	#endif
mbed714	0:d616ece2d859	152

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Type:	Library
Created:	18 Sep 2010
Imports:	1
Forks:	0
Commits:	1
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if/lwip/lwipNetDnsRequest.cpp@0:d616ece2d859, 2010-09-18 (annotated)

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