Rahol Rajan / NetServices-Traffic

Used in Live Traffic Update Nokia LCD Display Project

Fork of NetServices by Segundo Equipo

if/lwip/lwipNetDnsRequest.cpp@8:92b57208ab99, 2013-03-06 (annotated)

Committer:
rrajan8
Date:
Wed Mar 06 19:07:23 2013 +0000
Revision:
8:92b57208ab99
Parent:
0:ac1725ba162c 
This project utilizes mbed's networking features to display live traffic updates on the Nokia LCD using the MapQuest API's Traffic Web Service.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
segundo 0:ac1725ba162c 1
segundo 0:ac1725ba162c 2 /*
segundo 0:ac1725ba162c 3 Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
segundo 0:ac1725ba162c 4
segundo 0:ac1725ba162c 5 Permission is hereby granted, free of charge, to any person obtaining a copy
segundo 0:ac1725ba162c 6 of this software and associated documentation files (the "Software"), to deal
segundo 0:ac1725ba162c 7 in the Software without restriction, including without limitation the rights
segundo 0:ac1725ba162c 8 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
segundo 0:ac1725ba162c 9 copies of the Software, and to permit persons to whom the Software is
segundo 0:ac1725ba162c 10 furnished to do so, subject to the following conditions:
segundo 0:ac1725ba162c 11
segundo 0:ac1725ba162c 12 The above copyright notice and this permission notice shall be included in
segundo 0:ac1725ba162c 13 all copies or substantial portions of the Software.
segundo 0:ac1725ba162c 14
segundo 0:ac1725ba162c 15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
segundo 0:ac1725ba162c 16 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
segundo 0:ac1725ba162c 17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
segundo 0:ac1725ba162c 18 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
segundo 0:ac1725ba162c 19 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
segundo 0:ac1725ba162c 20 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
segundo 0:ac1725ba162c 21 THE SOFTWARE.
segundo 0:ac1725ba162c 22 */
segundo 0:ac1725ba162c 23
segundo 0:ac1725ba162c 24 #include "lwipNetDnsRequest.h"
segundo 0:ac1725ba162c 25 #include "lwip/err.h" //err_t, ERR_xxx
segundo 0:ac1725ba162c 26 #include "lwip/dns.h"
segundo 0:ac1725ba162c 27
segundo 0:ac1725ba162c 28 #include "netCfg.h"
segundo 0:ac1725ba162c 29 #if NET_LWIP_STACK
segundo 0:ac1725ba162c 30
segundo 0:ac1725ba162c 31 //#define __DEBUG
segundo 0:ac1725ba162c 32 #include "dbg/dbg.h"
segundo 0:ac1725ba162c 33
segundo 0:ac1725ba162c 34 LwipNetDnsRequest::LwipNetDnsRequest(const char* hostname) : NetDnsRequest(hostname), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false)
segundo 0:ac1725ba162c 35 {
segundo 0:ac1725ba162c 36 DBG("New LwipNetDnsRequest %p\n", this);
segundo 0:ac1725ba162c 37 }
segundo 0:ac1725ba162c 38
segundo 0:ac1725ba162c 39 LwipNetDnsRequest::LwipNetDnsRequest(Host* pHost) : NetDnsRequest(pHost), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false)
segundo 0:ac1725ba162c 40 {
segundo 0:ac1725ba162c 41 DBG("New LwipNetDnsRequest %p\n", this);
segundo 0:ac1725ba162c 42 }
segundo 0:ac1725ba162c 43
segundo 0:ac1725ba162c 44 LwipNetDnsRequest::~LwipNetDnsRequest()
segundo 0:ac1725ba162c 45 {
segundo 0:ac1725ba162c 46 DBG("LwipNetDnsRequest %p destroyed\n", this);
segundo 0:ac1725ba162c 47 }
segundo 0:ac1725ba162c 48
segundo 0:ac1725ba162c 49 /*
segundo 0:ac1725ba162c 50 Main useful function here (see lwip/dns.h):
segundo 0:ac1725ba162c 51 err_t dns_gethostbyname(const char *hostname, ip_addr_t *addr,
segundo 0:ac1725ba162c 52 dns_found_callback found, void *callback_arg);
segundo 0:ac1725ba162c 53 */
segundo 0:ac1725ba162c 54
segundo 0:ac1725ba162c 55 //Execute request & return OK if found, NOTFOUND or ERROR on error, or PROCESSING if the request has not completed yet
segundo 0:ac1725ba162c 56 void LwipNetDnsRequest::poll()
segundo 0:ac1725ba162c 57 {
segundo 0:ac1725ba162c 58 err_t err;
segundo 0:ac1725ba162c 59 switch(m_state)
segundo 0:ac1725ba162c 60 {
segundo 0:ac1725ba162c 61 case LWIPNETDNS_START: //First req, let's call dns_gethostbyname
segundo 0:ac1725ba162c 62 ip_addr_t ipStruct;
segundo 0:ac1725ba162c 63 err = dns_gethostbyname(m_hostname, &ipStruct, LwipNetDnsRequest::sFoundCb, (void*) this );
segundo 0:ac1725ba162c 64 if( err == ERR_OK )
segundo 0:ac1725ba162c 65 {
segundo 0:ac1725ba162c 66 m_ip = IpAddr(&ipStruct);
segundo 0:ac1725ba162c 67 m_state = LWIPNETDNS_OK;
segundo 0:ac1725ba162c 68 DBG("DNS: Ip found in cache.\n");
segundo 0:ac1725ba162c 69 }
segundo 0:ac1725ba162c 70 else if( err == ERR_INPROGRESS)
segundo 0:ac1725ba162c 71 {
segundo 0:ac1725ba162c 72 DBG("DNS: Processing.\n");
segundo 0:ac1725ba162c 73 m_state = LWIPNETDNS_PROCESSING;
segundo 0:ac1725ba162c 74 }
segundo 0:ac1725ba162c 75 else //Likely ERR_VAL
segundo 0:ac1725ba162c 76 {
segundo 0:ac1725ba162c 77 DBG("DNS: Error on init.\n");
segundo 0:ac1725ba162c 78 m_state = LWIPNETDNS_ERROR;
segundo 0:ac1725ba162c 79 }
segundo 0:ac1725ba162c 80 break;
segundo 0:ac1725ba162c 81 case LWIPNETDNS_PROCESSING:
segundo 0:ac1725ba162c 82 break; //Nothing to do, DNS is polled on interrupt
segundo 0:ac1725ba162c 83 case LWIPNETDNS_OK:
segundo 0:ac1725ba162c 84 if(!m_cbFired)
segundo 0:ac1725ba162c 85 {
segundo 0:ac1725ba162c 86 DBG("DNS: Ip found.\n");
segundo 0:ac1725ba162c 87 m_cbFired = true;
segundo 0:ac1725ba162c 88 onReply(NETDNS_FOUND); //Raise callback
segundo 0:ac1725ba162c 89 }
segundo 0:ac1725ba162c 90 break;
segundo 0:ac1725ba162c 91 case LWIPNETDNS_NOTFOUND:
segundo 0:ac1725ba162c 92 if(!m_cbFired)
segundo 0:ac1725ba162c 93 {
segundo 0:ac1725ba162c 94 DBG("DNS: could not be resolved.\n");
segundo 0:ac1725ba162c 95 m_cbFired = true;
segundo 0:ac1725ba162c 96 onReply(NETDNS_NOTFOUND); //Raise callback
segundo 0:ac1725ba162c 97 }
segundo 0:ac1725ba162c 98 break;
segundo 0:ac1725ba162c 99 case LWIPNETDNS_ERROR:
segundo 0:ac1725ba162c 100 default:
segundo 0:ac1725ba162c 101 if(!m_cbFired)
segundo 0:ac1725ba162c 102 {
segundo 0:ac1725ba162c 103 DBG("DNS: Error.\n");
segundo 0:ac1725ba162c 104 m_cbFired = true;
segundo 0:ac1725ba162c 105 onReply(NETDNS_ERROR); //Raise callback
segundo 0:ac1725ba162c 106 }
segundo 0:ac1725ba162c 107 break;
segundo 0:ac1725ba162c 108 }
segundo 0:ac1725ba162c 109 if(m_closing && (m_state!=LWIPNETDNS_PROCESSING)) //Check wether the closure has been reqd
segundo 0:ac1725ba162c 110 {
segundo 0:ac1725ba162c 111 DBG("LwipNetDnsRequest: Closing in poll()\n");
segundo 0:ac1725ba162c 112 NetDnsRequest::close();
segundo 0:ac1725ba162c 113 }
segundo 0:ac1725ba162c 114 }
segundo 0:ac1725ba162c 115
segundo 0:ac1725ba162c 116 void LwipNetDnsRequest::close()
segundo 0:ac1725ba162c 117 {
segundo 0:ac1725ba162c 118 DBG("LwipNetDnsRequest: Close req\n");
segundo 0:ac1725ba162c 119 if(m_state!=LWIPNETDNS_PROCESSING)
segundo 0:ac1725ba162c 120 {
segundo 0:ac1725ba162c 121 DBG("LwipNetDnsRequest: Closing in close()\n");
segundo 0:ac1725ba162c 122 NetDnsRequest::close();
segundo 0:ac1725ba162c 123 }
segundo 0:ac1725ba162c 124 else //Cannot close rightaway, waiting for callback from underlying layer
segundo 0:ac1725ba162c 125 {
segundo 0:ac1725ba162c 126 m_closing = true;
segundo 0:ac1725ba162c 127 }
segundo 0:ac1725ba162c 128 }
segundo 0:ac1725ba162c 129
segundo 0:ac1725ba162c 130 void LwipNetDnsRequest::foundCb(const char *name, ip_addr_t *ipaddr)
segundo 0:ac1725ba162c 131 {
segundo 0:ac1725ba162c 132 if( ipaddr == NULL )
segundo 0:ac1725ba162c 133 {
segundo 0:ac1725ba162c 134 DBG("LwipNetDnsRequest: Callback: Name not found\n");
segundo 0:ac1725ba162c 135 m_state = LWIPNETDNS_NOTFOUND;
segundo 0:ac1725ba162c 136 return;
segundo 0:ac1725ba162c 137 }
segundo 0:ac1725ba162c 138 DBG("LwipNetDnsRequest: Callback: Resolved\n");
segundo 0:ac1725ba162c 139 m_ip = IpAddr(ipaddr);
segundo 0:ac1725ba162c 140 m_state = LWIPNETDNS_OK;
segundo 0:ac1725ba162c 141 }
segundo 0:ac1725ba162c 142
segundo 0:ac1725ba162c 143
segundo 0:ac1725ba162c 144 void LwipNetDnsRequest::sFoundCb(const char *name, ip_addr_t *ipaddr, void *arg)
segundo 0:ac1725ba162c 145 {
segundo 0:ac1725ba162c 146 DBG("LwipNetDnsRequest: Static callback\n");
segundo 0:ac1725ba162c 147 LwipNetDnsRequest* pMe = (LwipNetDnsRequest*) arg;
segundo 0:ac1725ba162c 148 return pMe->foundCb( name, ipaddr );
segundo 0:ac1725ba162c 149 }
segundo 0:ac1725ba162c 150
segundo 0:ac1725ba162c 151 #endif
segundo 0:ac1725ba162c 152