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Embedded C project:18/12/2014
Dependencies: DS1307 TextLCD mbed
Diff: NetServices/if/lwip/lwipNetDnsRequest.cpp
- Revision:
- 0:8d87bc453349
diff -r 000000000000 -r 8d87bc453349 NetServices/if/lwip/lwipNetDnsRequest.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NetServices/if/lwip/lwipNetDnsRequest.cpp Thu Dec 18 09:35:49 2014 +0000 @@ -0,0 +1,152 @@ + +/* +Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com) + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. +*/ + +#include "lwipNetDnsRequest.h" +#include "lwip/err.h" //err_t, ERR_xxx +#include "lwip/dns.h" + +#include "netCfg.h" +#if NET_LWIP_STACK + +//#define __DEBUG +#include "dbg/dbg.h" + +LwipNetDnsRequest::LwipNetDnsRequest(const char* hostname) : NetDnsRequest(hostname), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false) +{ + DBG("New LwipNetDnsRequest %p\n", this); +} + +LwipNetDnsRequest::LwipNetDnsRequest(Host* pHost) : NetDnsRequest(pHost), m_state(LWIPNETDNS_START), m_cbFired(false), m_closing(false) +{ + DBG("New LwipNetDnsRequest %p\n", this); +} + +LwipNetDnsRequest::~LwipNetDnsRequest() +{ + DBG("LwipNetDnsRequest %p destroyed\n", this); +} + +/* +Main useful function here (see lwip/dns.h): +err_t dns_gethostbyname(const char *hostname, ip_addr_t *addr, + dns_found_callback found, void *callback_arg); +*/ + +//Execute request & return OK if found, NOTFOUND or ERROR on error, or PROCESSING if the request has not completed yet +void LwipNetDnsRequest::poll() +{ + err_t err; + switch(m_state) + { + case LWIPNETDNS_START: //First req, let's call dns_gethostbyname + ip_addr_t ipStruct; + err = dns_gethostbyname(m_hostname, &ipStruct, LwipNetDnsRequest::sFoundCb, (void*) this ); + if( err == ERR_OK ) + { + m_ip = IpAddr(&ipStruct); + m_state = LWIPNETDNS_OK; + DBG("DNS: Ip found in cache.\n"); + } + else if( err == ERR_INPROGRESS) + { + DBG("DNS: Processing.\n"); + m_state = LWIPNETDNS_PROCESSING; + } + else //Likely ERR_VAL + { + DBG("DNS: Error on init.\n"); + m_state = LWIPNETDNS_ERROR; + } + break; + case LWIPNETDNS_PROCESSING: + break; //Nothing to do, DNS is polled on interrupt + case LWIPNETDNS_OK: + if(!m_cbFired) + { + DBG("DNS: Ip found.\n"); + m_cbFired = true; + onReply(NETDNS_FOUND); //Raise callback + } + break; + case LWIPNETDNS_NOTFOUND: + if(!m_cbFired) + { + DBG("DNS: could not be resolved.\n"); + m_cbFired = true; + onReply(NETDNS_NOTFOUND); //Raise callback + } + break; + case LWIPNETDNS_ERROR: + default: + if(!m_cbFired) + { + DBG("DNS: Error.\n"); + m_cbFired = true; + onReply(NETDNS_ERROR); //Raise callback + } + break; + } + if(m_closing && (m_state!=LWIPNETDNS_PROCESSING)) //Check wether the closure has been reqd + { + DBG("LwipNetDnsRequest: Closing in poll()\n"); + NetDnsRequest::close(); + } +} + +void LwipNetDnsRequest::close() +{ + DBG("LwipNetDnsRequest: Close req\n"); + if(m_state!=LWIPNETDNS_PROCESSING) + { + DBG("LwipNetDnsRequest: Closing in close()\n"); + NetDnsRequest::close(); + } + else //Cannot close rightaway, waiting for callback from underlying layer + { + m_closing = true; + } +} + +void LwipNetDnsRequest::foundCb(const char *name, ip_addr_t *ipaddr) +{ + if( ipaddr == NULL ) + { + DBG("LwipNetDnsRequest: Callback: Name not found\n"); + m_state = LWIPNETDNS_NOTFOUND; + return; + } + DBG("LwipNetDnsRequest: Callback: Resolved\n"); + m_ip = IpAddr(ipaddr); + m_state = LWIPNETDNS_OK; +} + + +void LwipNetDnsRequest::sFoundCb(const char *name, ip_addr_t *ipaddr, void *arg) +{ + DBG("LwipNetDnsRequest: Static callback\n"); + LwipNetDnsRequest* pMe = (LwipNetDnsRequest*) arg; + return pMe->foundCb( name, ipaddr ); +} + +#endif +