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Dependencies:   mbed

NetServices/if/lwip/lwipNetDnsRequest.cpp@1:f5ac63519541, 2014-03-05 (annotated)

Committer:
Michael J. Spencer
Date:
Wed Mar 05 06:14:02 2014 -0800
Revision:
1:f5ac63519541
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Michael J. Spencer 1:f5ac63519541 1
Michael J. Spencer 1:f5ac63519541 2 /*
Michael J. Spencer 1:f5ac63519541 3 Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
Michael J. Spencer 1:f5ac63519541 4
Michael J. Spencer 1:f5ac63519541 5 Permission is hereby granted, free of charge, to any person obtaining a copy
Michael J. Spencer 1:f5ac63519541 6 of this software and associated documentation files (the "Software"), to deal
Michael J. Spencer 1:f5ac63519541 7 in the Software without restriction, including without limitation the rights
Michael J. Spencer 1:f5ac63519541 8 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Michael J. Spencer 1:f5ac63519541 9 copies of the Software, and to permit persons to whom the Software is
Michael J. Spencer 1:f5ac63519541 10 furnished to do so, subject to the following conditions:
Michael J. Spencer 1:f5ac63519541 11
Michael J. Spencer 1:f5ac63519541 12 The above copyright notice and this permission notice shall be included in
Michael J. Spencer 1:f5ac63519541 13 all copies or substantial portions of the Software.
Michael J. Spencer 1:f5ac63519541 14
Michael J. Spencer 1:f5ac63519541 15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Michael J. Spencer 1:f5ac63519541 16 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Michael J. Spencer 1:f5ac63519541 17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Michael J. Spencer 1:f5ac63519541 18 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Michael J. Spencer 1:f5ac63519541 19 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Michael J. Spencer 1:f5ac63519541 20 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
Michael J. Spencer 1:f5ac63519541 21 THE SOFTWARE.
Michael J. Spencer 1:f5ac63519541 22 */
Michael J. Spencer 1:f5ac63519541 23
Michael J. Spencer 1:f5ac63519541 24 #include "lwipNetDnsRequest.h"
Michael J. Spencer 1:f5ac63519541 25 extern "C"
Michael J. Spencer 1:f5ac63519541 26 {
Michael J. Spencer 1:f5ac63519541 27 #include "lwip/err.h" //err_t, ERR_xxx
Michael J. Spencer 1:f5ac63519541 28 #include "lwip/dns.h"
Michael J. Spencer 1:f5ac63519541 29 }
Michael J. Spencer 1:f5ac63519541 30 #include "netCfg.h"
Michael J. Spencer 1:f5ac63519541 31 #if NET_LWIP_STACK
Michael J. Spencer 1:f5ac63519541 32
Michael J. Spencer 1:f5ac63519541 33 //#define __DEBUG
Michael J. Spencer 1:f5ac63519541 34 #include "dbg/dbg.h"
Michael J. Spencer 1:f5ac63519541 35
Michael J. Spencer 1:f5ac63519541 36 LwipNetDnsRequest::LwipNetDnsRequest(const char* hostname) : NetDnsRequest(hostname), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false)
Michael J. Spencer 1:f5ac63519541 37 {
Michael J. Spencer 1:f5ac63519541 38 DBG("New LwipNetDnsRequest %p\n", this);
Michael J. Spencer 1:f5ac63519541 39 }
Michael J. Spencer 1:f5ac63519541 40
Michael J. Spencer 1:f5ac63519541 41 LwipNetDnsRequest::LwipNetDnsRequest(Host* pHost) : NetDnsRequest(pHost), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false)
Michael J. Spencer 1:f5ac63519541 42 {
Michael J. Spencer 1:f5ac63519541 43 DBG("New LwipNetDnsRequest %p\n", this);
Michael J. Spencer 1:f5ac63519541 44 }
Michael J. Spencer 1:f5ac63519541 45
Michael J. Spencer 1:f5ac63519541 46 LwipNetDnsRequest::~LwipNetDnsRequest()
Michael J. Spencer 1:f5ac63519541 47 {
Michael J. Spencer 1:f5ac63519541 48 DBG("LwipNetDnsRequest %p destroyed\n", this);
Michael J. Spencer 1:f5ac63519541 49 }
Michael J. Spencer 1:f5ac63519541 50
Michael J. Spencer 1:f5ac63519541 51 /*
Michael J. Spencer 1:f5ac63519541 52 Main useful function here (see lwip/dns.h):
Michael J. Spencer 1:f5ac63519541 53 err_t dns_gethostbyname(const char *hostname, ip_addr_t *addr,
Michael J. Spencer 1:f5ac63519541 54 dns_found_callback found, void *callback_arg);
Michael J. Spencer 1:f5ac63519541 55 */
Michael J. Spencer 1:f5ac63519541 56
Michael J. Spencer 1:f5ac63519541 57 //Execute request & return OK if found, NOTFOUND or ERROR on error, or PROCESSING if the request has not completed yet
Michael J. Spencer 1:f5ac63519541 58 void LwipNetDnsRequest::poll()
Michael J. Spencer 1:f5ac63519541 59 {
Michael J. Spencer 1:f5ac63519541 60 err_t err;
Michael J. Spencer 1:f5ac63519541 61 switch(m_state)
Michael J. Spencer 1:f5ac63519541 62 {
Michael J. Spencer 1:f5ac63519541 63 case LWIPNETDNS_START: //First req, let's call dns_gethostbyname
Michael J. Spencer 1:f5ac63519541 64 ip_addr_t ipStruct;
Michael J. Spencer 1:f5ac63519541 65 err = dns_gethostbyname(m_hostname, &ipStruct, LwipNetDnsRequest::sFoundCb, (void*) this );
Michael J. Spencer 1:f5ac63519541 66 if( err == ERR_OK )
Michael J. Spencer 1:f5ac63519541 67 {
Michael J. Spencer 1:f5ac63519541 68 m_ip = IpAddr(&ipStruct);
Michael J. Spencer 1:f5ac63519541 69 m_state = LWIPNETDNS_OK;
Michael J. Spencer 1:f5ac63519541 70 DBG("DNS: Ip found in cache.\n");
Michael J. Spencer 1:f5ac63519541 71 }
Michael J. Spencer 1:f5ac63519541 72 else if( err == ERR_INPROGRESS)
Michael J. Spencer 1:f5ac63519541 73 {
Michael J. Spencer 1:f5ac63519541 74 DBG("DNS: Processing.\n");
Michael J. Spencer 1:f5ac63519541 75 m_state = LWIPNETDNS_PROCESSING;
Michael J. Spencer 1:f5ac63519541 76 }
Michael J. Spencer 1:f5ac63519541 77 else //Likely ERR_VAL
Michael J. Spencer 1:f5ac63519541 78 {
Michael J. Spencer 1:f5ac63519541 79 DBG("DNS: Error on init.\n");
Michael J. Spencer 1:f5ac63519541 80 m_state = LWIPNETDNS_ERROR;
Michael J. Spencer 1:f5ac63519541 81 }
Michael J. Spencer 1:f5ac63519541 82 break;
Michael J. Spencer 1:f5ac63519541 83 case LWIPNETDNS_PROCESSING:
Michael J. Spencer 1:f5ac63519541 84 break; //Nothing to do, DNS is polled on interrupt
Michael J. Spencer 1:f5ac63519541 85 case LWIPNETDNS_OK:
Michael J. Spencer 1:f5ac63519541 86 if(!m_cbFired)
Michael J. Spencer 1:f5ac63519541 87 {
Michael J. Spencer 1:f5ac63519541 88 DBG("DNS: Ip found.\n");
Michael J. Spencer 1:f5ac63519541 89 m_cbFired = true;
Michael J. Spencer 1:f5ac63519541 90 onReply(NETDNS_FOUND); //Raise callback
Michael J. Spencer 1:f5ac63519541 91 }
Michael J. Spencer 1:f5ac63519541 92 break;
Michael J. Spencer 1:f5ac63519541 93 case LWIPNETDNS_NOTFOUND:
Michael J. Spencer 1:f5ac63519541 94 if(!m_cbFired)
Michael J. Spencer 1:f5ac63519541 95 {
Michael J. Spencer 1:f5ac63519541 96 DBG("DNS: could not be resolved.\n");
Michael J. Spencer 1:f5ac63519541 97 m_cbFired = true;
Michael J. Spencer 1:f5ac63519541 98 onReply(NETDNS_NOTFOUND); //Raise callback
Michael J. Spencer 1:f5ac63519541 99 }
Michael J. Spencer 1:f5ac63519541 100 break;
Michael J. Spencer 1:f5ac63519541 101 case LWIPNETDNS_ERROR:
Michael J. Spencer 1:f5ac63519541 102 default:
Michael J. Spencer 1:f5ac63519541 103 if(!m_cbFired)
Michael J. Spencer 1:f5ac63519541 104 {
Michael J. Spencer 1:f5ac63519541 105 DBG("DNS: Error.\n");
Michael J. Spencer 1:f5ac63519541 106 m_cbFired = true;
Michael J. Spencer 1:f5ac63519541 107 onReply(NETDNS_ERROR); //Raise callback
Michael J. Spencer 1:f5ac63519541 108 }
Michael J. Spencer 1:f5ac63519541 109 break;
Michael J. Spencer 1:f5ac63519541 110 }
Michael J. Spencer 1:f5ac63519541 111 if(m_closing && (m_state!=LWIPNETDNS_PROCESSING)) //Check wether the closure has been reqd
Michael J. Spencer 1:f5ac63519541 112 {
Michael J. Spencer 1:f5ac63519541 113 DBG("LwipNetDnsRequest: Closing in poll()\n");
Michael J. Spencer 1:f5ac63519541 114 NetDnsRequest::close();
Michael J. Spencer 1:f5ac63519541 115 }
Michael J. Spencer 1:f5ac63519541 116 }
Michael J. Spencer 1:f5ac63519541 117
Michael J. Spencer 1:f5ac63519541 118 void LwipNetDnsRequest::close()
Michael J. Spencer 1:f5ac63519541 119 {
Michael J. Spencer 1:f5ac63519541 120 DBG("LwipNetDnsRequest: Close req\n");
Michael J. Spencer 1:f5ac63519541 121 if(m_state!=LWIPNETDNS_PROCESSING)
Michael J. Spencer 1:f5ac63519541 122 {
Michael J. Spencer 1:f5ac63519541 123 DBG("LwipNetDnsRequest: Closing in close()\n");
Michael J. Spencer 1:f5ac63519541 124 NetDnsRequest::close();
Michael J. Spencer 1:f5ac63519541 125 }
Michael J. Spencer 1:f5ac63519541 126 else //Cannot close rightaway, waiting for callback from underlying layer
Michael J. Spencer 1:f5ac63519541 127 {
Michael J. Spencer 1:f5ac63519541 128 m_closing = true;
Michael J. Spencer 1:f5ac63519541 129 }
Michael J. Spencer 1:f5ac63519541 130 }
Michael J. Spencer 1:f5ac63519541 131
Michael J. Spencer 1:f5ac63519541 132 void LwipNetDnsRequest::foundCb(const char *name, ip_addr_t *ipaddr)
Michael J. Spencer 1:f5ac63519541 133 {
Michael J. Spencer 1:f5ac63519541 134 if( ipaddr == NULL )
Michael J. Spencer 1:f5ac63519541 135 {
Michael J. Spencer 1:f5ac63519541 136 DBG("LwipNetDnsRequest: Callback: Name not found\n");
Michael J. Spencer 1:f5ac63519541 137 m_state = LWIPNETDNS_NOTFOUND;
Michael J. Spencer 1:f5ac63519541 138 return;
Michael J. Spencer 1:f5ac63519541 139 }
Michael J. Spencer 1:f5ac63519541 140 DBG("LwipNetDnsRequest: Callback: Resolved\n");
Michael J. Spencer 1:f5ac63519541 141 m_ip = IpAddr(ipaddr);
Michael J. Spencer 1:f5ac63519541 142 m_state = LWIPNETDNS_OK;
Michael J. Spencer 1:f5ac63519541 143 }
Michael J. Spencer 1:f5ac63519541 144
Michael J. Spencer 1:f5ac63519541 145
Michael J. Spencer 1:f5ac63519541 146 void LwipNetDnsRequest::sFoundCb(const char *name, ip_addr_t *ipaddr, void *arg)
Michael J. Spencer 1:f5ac63519541 147 {
Michael J. Spencer 1:f5ac63519541 148 DBG("LwipNetDnsRequest: Static callback\n");
Michael J. Spencer 1:f5ac63519541 149 LwipNetDnsRequest* pMe = (LwipNetDnsRequest*) arg;
Michael J. Spencer 1:f5ac63519541 150 return pMe->foundCb( name, ipaddr );
Michael J. Spencer 1:f5ac63519541 151 }
Michael J. Spencer 1:f5ac63519541 152
Michael J. Spencer 1:f5ac63519541 153 #endif
Michael J. Spencer 1:f5ac63519541 154