Henry Leinen / WifiPlusClick

Implementation of the WifiPlusClick hardware module.

Dependents:   WifiPlusKlickExample

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DnsQuery Class Reference
Public Member Functions

DnsQuery Class Reference

Class DnsQuery implements DNS over UDP functionality. More...

#include <DnsQuery.h>

Public Member Functions

 DnsQuery (Wifi *wifi, IPADDRESS_t *dnsip)
 Constructor to instantiate a DnsQuery object.
bool gethostbyname (const char *hostname, IPADDRESS_t &ipaddress)
 Function gethostbyname implements the functionality to query a domain name server for an IP-Address of a given hostname.

Detailed Description

Class DnsQuery implements DNS over UDP functionality.

Example as a typical use case : 

 #include "mbed.h"
 #include "DnsQuery.h"

 void main(void)
 {
     IPADDRESS_t ipAddress;  // will receive the ip address of the host
     IPADDRESS_t dnsIp = { 192, 168, 178, 1 };      // Ip Address of the DNS server
     
     DnsQuery dns(Wifi::getInstance(), &dnsIp);
     if (dns.gethostbyname("mbed.org", ipAddress)) {
         printf("Ip-Address of mbed.org is %d.%d.%d.%d\n", ipAddress.sin_addr.o1, ipAddress.sin_addr.o2, ipAddress.sin_addr.o3, ipAddress.sin_addr.o4);
     } else {
         printf("Unable to obtain IP-Address\n");
     }
 }

Definition at line 44 of file DnsQuery.h.

Constructor & Destructor Documentation

DnsQuery ( Wifi *  wifi,
IPADDRESS_t *  dnsip 
)

Constructor to instantiate a DnsQuery object.

Parameters:
wifi: A valid pointer to a Wifi Object, which can be used to obtain a UDP socket object.
dnsip: A valid pointer which holds the IPAddress of the DNS server to query.

Definition at line 26 of file DnsQuery.cpp.

Member Function Documentation

bool gethostbyname ( const char *  hostname,
IPADDRESS_t &  ipaddress 
)

Function gethostbyname implements the functionality to query a domain name server for an IP-Address of a given hostname.

Parameters:
hostname: the hostname of interest as a string.
ipaddress: a reference to a IPADDRESS_t object which will receive the resolved IP Address of the host in question.
Returns:
true if successfull, or false otherwise.

Definition at line 37 of file DnsQuery.cpp.

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