Retrieving an IP Network Parameters Tutorial

Retrieve IP Network Parameters example

The following is an example code for how to retrieve IP network parameters:

//create a socket connection  

RSocketServ esock; 
TInt err = eSock.Connect();
...

//handle the error
...
RConnection aConnection;   //create a RConnection 
err = aConnection.Open(esock);
...

//start the connection with necessary preferences
...
err = aConnection.Start(iConnPrefs);


//Retrieve the TFTP server address

TRequestStatus status1;
TTftpServerAddrBuf tftpserveraddr; // Buffer to store TFTP server address
tftpserveraddr().index = 0;
aConnection.Ioctl(KCOLConfiguration, KConnGetTftpServerAddr, status1, &tftpserveraddress);
User::WaitForRequest(status1);
...

//Retrieve the host name of the TFTP server

TRequestStatus status2;
TBuf<256> tftpname; //buffer to store TFTP server name
aConnection.Ioctl(KCOLConfiguration, KConnGetTftpServerName, status2, &tftpname);
User::WaitForRequest(status2);
...

//Retrieve SiAddr field from a DHCP header

TRequestStatus status3;
TConnectionAddrBuf addr;
addr().iAddressFamily = IpAddressFamily();
aConnection.Ioctl(KCOLConfiguration, KConnGetDhcpHdrSiaddr, status3, &addr);
...
//Retrieve SName field from a DHCP header

TRequestStatus status4;
TBuf<64> snamebuf;
aConnection.Ioctl(KCOLConfiguration, KConnGetDhcpHdrSname, status4, &snamebuf);
...
//Retrieve the active IP address

TRequestStatus status5;
TConnectionAddress actaddr;
actaddr().iAddressFamily = IpAddressFamily();
aConnection.Ioctl(KCOLConfiguration, KConnGetCurrentAddr, status5, &actaddr); 
...

//Retrieve multiple parameters

Multiple opcodes can be queried to a DHCP server using the 
TDhcpRawOptionMultipleDataPckg object. 

TBuf8<300> rawbuf;
rawbuf.FillZ(300);   //buffer must be large enough for all returned options values
TDhcpRawOptionMultipleDataPckg pckg1(rawbuf);
pckg1.AddRawOptionCodeL(KTFtpServerAddress);    //option 150 
pckg1.AddRawOptionCodeL(KGeoConfCivicOption);   //option 99
pckg1.AddRawOptionCodeL(KTFtpServerName);  // option 66
TRequestStatus status6;    

// Get raw option data for ip4

aConnection.Ioctl(KCOLConfiguration, KConnDhcpGetMultipleParams, status6, &rawbuf);
User::WaitForRequest(status);
...