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NetServices/if/lwip/lwipNetDnsRequest.cpp@0:05ccbd4f84f1, 2013-12-02 (annotated)

Committer:
hendrikvincent
Date:
Mon Dec 02 09:01:23 2013 +0000
Revision:
0:05ccbd4f84f1
eerste programma;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hendrikvincent 0:05ccbd4f84f1 1
hendrikvincent 0:05ccbd4f84f1 2 /*
hendrikvincent 0:05ccbd4f84f1 3 Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
hendrikvincent 0:05ccbd4f84f1 4
hendrikvincent 0:05ccbd4f84f1 5 Permission is hereby granted, free of charge, to any person obtaining a copy
hendrikvincent 0:05ccbd4f84f1 6 of this software and associated documentation files (the "Software"), to deal
hendrikvincent 0:05ccbd4f84f1 7 in the Software without restriction, including without limitation the rights
hendrikvincent 0:05ccbd4f84f1 8 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
hendrikvincent 0:05ccbd4f84f1 9 copies of the Software, and to permit persons to whom the Software is
hendrikvincent 0:05ccbd4f84f1 10 furnished to do so, subject to the following conditions:
hendrikvincent 0:05ccbd4f84f1 11
hendrikvincent 0:05ccbd4f84f1 12 The above copyright notice and this permission notice shall be included in
hendrikvincent 0:05ccbd4f84f1 13 all copies or substantial portions of the Software.
hendrikvincent 0:05ccbd4f84f1 14
hendrikvincent 0:05ccbd4f84f1 15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
hendrikvincent 0:05ccbd4f84f1 16 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
hendrikvincent 0:05ccbd4f84f1 17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
hendrikvincent 0:05ccbd4f84f1 18 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
hendrikvincent 0:05ccbd4f84f1 19 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
hendrikvincent 0:05ccbd4f84f1 20 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
hendrikvincent 0:05ccbd4f84f1 21 THE SOFTWARE.
hendrikvincent 0:05ccbd4f84f1 22 */
hendrikvincent 0:05ccbd4f84f1 23
hendrikvincent 0:05ccbd4f84f1 24 #include "lwipNetDnsRequest.h"
hendrikvincent 0:05ccbd4f84f1 25 #include "lwip/err.h" //err_t, ERR_xxx
hendrikvincent 0:05ccbd4f84f1 26 #include "lwip/dns.h"
hendrikvincent 0:05ccbd4f84f1 27
hendrikvincent 0:05ccbd4f84f1 28 #include "netCfg.h"
hendrikvincent 0:05ccbd4f84f1 29 #if NET_LWIP_STACK
hendrikvincent 0:05ccbd4f84f1 30
hendrikvincent 0:05ccbd4f84f1 31 //#define __DEBUG
hendrikvincent 0:05ccbd4f84f1 32 #include "dbg/dbg.h"
hendrikvincent 0:05ccbd4f84f1 33
hendrikvincent 0:05ccbd4f84f1 34 LwipNetDnsRequest::LwipNetDnsRequest(const char* hostname) : NetDnsRequest(hostname), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false)
hendrikvincent 0:05ccbd4f84f1 35 {
hendrikvincent 0:05ccbd4f84f1 36 DBG("New LwipNetDnsRequest %p\n", this);
hendrikvincent 0:05ccbd4f84f1 37 }
hendrikvincent 0:05ccbd4f84f1 38
hendrikvincent 0:05ccbd4f84f1 39 LwipNetDnsRequest::LwipNetDnsRequest(Host* pHost) : NetDnsRequest(pHost), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false)
hendrikvincent 0:05ccbd4f84f1 40 {
hendrikvincent 0:05ccbd4f84f1 41 DBG("New LwipNetDnsRequest %p\n", this);
hendrikvincent 0:05ccbd4f84f1 42 }
hendrikvincent 0:05ccbd4f84f1 43
hendrikvincent 0:05ccbd4f84f1 44 LwipNetDnsRequest::~LwipNetDnsRequest()
hendrikvincent 0:05ccbd4f84f1 45 {
hendrikvincent 0:05ccbd4f84f1 46 DBG("LwipNetDnsRequest %p destroyed\n", this);
hendrikvincent 0:05ccbd4f84f1 47 }
hendrikvincent 0:05ccbd4f84f1 48
hendrikvincent 0:05ccbd4f84f1 49 /*
hendrikvincent 0:05ccbd4f84f1 50 Main useful function here (see lwip/dns.h):
hendrikvincent 0:05ccbd4f84f1 51 err_t dns_gethostbyname(const char *hostname, ip_addr_t *addr,
hendrikvincent 0:05ccbd4f84f1 52 dns_found_callback found, void *callback_arg);
hendrikvincent 0:05ccbd4f84f1 53 */
hendrikvincent 0:05ccbd4f84f1 54
hendrikvincent 0:05ccbd4f84f1 55 //Execute request & return OK if found, NOTFOUND or ERROR on error, or PROCESSING if the request has not completed yet
hendrikvincent 0:05ccbd4f84f1 56 void LwipNetDnsRequest::poll()
hendrikvincent 0:05ccbd4f84f1 57 {
hendrikvincent 0:05ccbd4f84f1 58 err_t err;
hendrikvincent 0:05ccbd4f84f1 59 switch(m_state)
hendrikvincent 0:05ccbd4f84f1 60 {
hendrikvincent 0:05ccbd4f84f1 61 case LWIPNETDNS_START: //First req, let's call dns_gethostbyname
hendrikvincent 0:05ccbd4f84f1 62 ip_addr_t ipStruct;
hendrikvincent 0:05ccbd4f84f1 63 err = dns_gethostbyname(m_hostname, &ipStruct, LwipNetDnsRequest::sFoundCb, (void*) this );
hendrikvincent 0:05ccbd4f84f1 64 if( err == ERR_OK )
hendrikvincent 0:05ccbd4f84f1 65 {
hendrikvincent 0:05ccbd4f84f1 66 m_ip = IpAddr(&ipStruct);
hendrikvincent 0:05ccbd4f84f1 67 m_state = LWIPNETDNS_OK;
hendrikvincent 0:05ccbd4f84f1 68 DBG("DNS: Ip found in cache.\n");
hendrikvincent 0:05ccbd4f84f1 69 }
hendrikvincent 0:05ccbd4f84f1 70 else if( err == ERR_INPROGRESS)
hendrikvincent 0:05ccbd4f84f1 71 {
hendrikvincent 0:05ccbd4f84f1 72 DBG("DNS: Processing.\n");
hendrikvincent 0:05ccbd4f84f1 73 m_state = LWIPNETDNS_PROCESSING;
hendrikvincent 0:05ccbd4f84f1 74 }
hendrikvincent 0:05ccbd4f84f1 75 else //Likely ERR_VAL
hendrikvincent 0:05ccbd4f84f1 76 {
hendrikvincent 0:05ccbd4f84f1 77 DBG("DNS: Error on init.\n");
hendrikvincent 0:05ccbd4f84f1 78 m_state = LWIPNETDNS_ERROR;
hendrikvincent 0:05ccbd4f84f1 79 }
hendrikvincent 0:05ccbd4f84f1 80 break;
hendrikvincent 0:05ccbd4f84f1 81 case LWIPNETDNS_PROCESSING:
hendrikvincent 0:05ccbd4f84f1 82 break; //Nothing to do, DNS is polled on interrupt
hendrikvincent 0:05ccbd4f84f1 83 case LWIPNETDNS_OK:
hendrikvincent 0:05ccbd4f84f1 84 if(!m_cbFired)
hendrikvincent 0:05ccbd4f84f1 85 {
hendrikvincent 0:05ccbd4f84f1 86 DBG("DNS: Ip found.\n");
hendrikvincent 0:05ccbd4f84f1 87 m_cbFired = true;
hendrikvincent 0:05ccbd4f84f1 88 onReply(NETDNS_FOUND); //Raise callback
hendrikvincent 0:05ccbd4f84f1 89 }
hendrikvincent 0:05ccbd4f84f1 90 break;
hendrikvincent 0:05ccbd4f84f1 91 case LWIPNETDNS_NOTFOUND:
hendrikvincent 0:05ccbd4f84f1 92 if(!m_cbFired)
hendrikvincent 0:05ccbd4f84f1 93 {
hendrikvincent 0:05ccbd4f84f1 94 DBG("DNS: could not be resolved.\n");
hendrikvincent 0:05ccbd4f84f1 95 m_cbFired = true;
hendrikvincent 0:05ccbd4f84f1 96 onReply(NETDNS_NOTFOUND); //Raise callback
hendrikvincent 0:05ccbd4f84f1 97 }
hendrikvincent 0:05ccbd4f84f1 98 break;
hendrikvincent 0:05ccbd4f84f1 99 case LWIPNETDNS_ERROR:
hendrikvincent 0:05ccbd4f84f1 100 default:
hendrikvincent 0:05ccbd4f84f1 101 if(!m_cbFired)
hendrikvincent 0:05ccbd4f84f1 102 {
hendrikvincent 0:05ccbd4f84f1 103 DBG("DNS: Error.\n");
hendrikvincent 0:05ccbd4f84f1 104 m_cbFired = true;
hendrikvincent 0:05ccbd4f84f1 105 onReply(NETDNS_ERROR); //Raise callback
hendrikvincent 0:05ccbd4f84f1 106 }
hendrikvincent 0:05ccbd4f84f1 107 break;
hendrikvincent 0:05ccbd4f84f1 108 }
hendrikvincent 0:05ccbd4f84f1 109 if(m_closing && (m_state!=LWIPNETDNS_PROCESSING)) //Check wether the closure has been reqd
hendrikvincent 0:05ccbd4f84f1 110 {
hendrikvincent 0:05ccbd4f84f1 111 DBG("LwipNetDnsRequest: Closing in poll()\n");
hendrikvincent 0:05ccbd4f84f1 112 NetDnsRequest::close();
hendrikvincent 0:05ccbd4f84f1 113 }
hendrikvincent 0:05ccbd4f84f1 114 }
hendrikvincent 0:05ccbd4f84f1 115
hendrikvincent 0:05ccbd4f84f1 116 void LwipNetDnsRequest::close()
hendrikvincent 0:05ccbd4f84f1 117 {
hendrikvincent 0:05ccbd4f84f1 118 DBG("LwipNetDnsRequest: Close req\n");
hendrikvincent 0:05ccbd4f84f1 119 if(m_state!=LWIPNETDNS_PROCESSING)
hendrikvincent 0:05ccbd4f84f1 120 {
hendrikvincent 0:05ccbd4f84f1 121 DBG("LwipNetDnsRequest: Closing in close()\n");
hendrikvincent 0:05ccbd4f84f1 122 NetDnsRequest::close();
hendrikvincent 0:05ccbd4f84f1 123 }
hendrikvincent 0:05ccbd4f84f1 124 else //Cannot close rightaway, waiting for callback from underlying layer
hendrikvincent 0:05ccbd4f84f1 125 {
hendrikvincent 0:05ccbd4f84f1 126 m_closing = true;
hendrikvincent 0:05ccbd4f84f1 127 }
hendrikvincent 0:05ccbd4f84f1 128 }
hendrikvincent 0:05ccbd4f84f1 129
hendrikvincent 0:05ccbd4f84f1 130 void LwipNetDnsRequest::foundCb(const char *name, ip_addr_t *ipaddr)
hendrikvincent 0:05ccbd4f84f1 131 {
hendrikvincent 0:05ccbd4f84f1 132 if( ipaddr == NULL )
hendrikvincent 0:05ccbd4f84f1 133 {
hendrikvincent 0:05ccbd4f84f1 134 DBG("LwipNetDnsRequest: Callback: Name not found\n");
hendrikvincent 0:05ccbd4f84f1 135 m_state = LWIPNETDNS_NOTFOUND;
hendrikvincent 0:05ccbd4f84f1 136 return;
hendrikvincent 0:05ccbd4f84f1 137 }
hendrikvincent 0:05ccbd4f84f1 138 DBG("LwipNetDnsRequest: Callback: Resolved\n");
hendrikvincent 0:05ccbd4f84f1 139 m_ip = IpAddr(ipaddr);
hendrikvincent 0:05ccbd4f84f1 140 m_state = LWIPNETDNS_OK;
hendrikvincent 0:05ccbd4f84f1 141 }
hendrikvincent 0:05ccbd4f84f1 142
hendrikvincent 0:05ccbd4f84f1 143
hendrikvincent 0:05ccbd4f84f1 144 void LwipNetDnsRequest::sFoundCb(const char *name, ip_addr_t *ipaddr, void *arg)
hendrikvincent 0:05ccbd4f84f1 145 {
hendrikvincent 0:05ccbd4f84f1 146 DBG("LwipNetDnsRequest: Static callback\n");
hendrikvincent 0:05ccbd4f84f1 147 LwipNetDnsRequest* pMe = (LwipNetDnsRequest*) arg;
hendrikvincent 0:05ccbd4f84f1 148 return pMe->foundCb( name, ipaddr );
hendrikvincent 0:05ccbd4f84f1 149 }
hendrikvincent 0:05ccbd4f84f1 150
hendrikvincent 0:05ccbd4f84f1 151 #endif
hendrikvincent 0:05ccbd4f84f1 152