Specifying routing settings to a specific socket connection using Symbian C++

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Article Metadata

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Tested with

Devices(s): Nokia 7710

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Compatibility

Platform(s): S60 2nd Edition,
S60 2nd Edition, FP1, FP2, and FP3
S60 3rd Edition
Series 80 2nd Edition

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Article

Created: User:Technical writer 1 (July 7, 2005, updated November 23, 2007)

Last edited: hamishwillee (14 Jun 2012)

Overview

In a controlled network environment you may often find yourself having to set specific routing options to your socket connection. This tip details how this can be done with Symbian sockets.

Description

Specific settings can be set through the TSoInetRouteInfo type, which encapsulates a set of routing-specific variables into one package (i.e., gateway, subnet mask, etc). The object must then be packaged in to a TPckgBuf type object so it can be passed to the SetOpt() function.

You also need to use the INET_ADDR macro that can be found in the in_sock.h header. This macro forms a 32-bit integer from a normal dotted-decimal IP address.

Solution

// Connect to the socket server
RSocketServ socketServ;
socketServ.Connect();
// Open a channel<br>RSocket sock;
User::LeaveIfError(sock.Open(socketServ, 
                         KAfInet,
                         KSockStream,
                         KProtocolInetTcp));
// Packaging the variable and setting the values
TPckgBuf<TSoInetRouteInfo> info;
info().iDstAddr.SetAddress(iDestAddr);
info().iNetMask.SetAddress(INET_ADDR(255,255,255,0));
info().iGateway.SetAddress(INET_ADDR(127,0,0,1));
info().iIfAddr.SetAddress(INET_ADDR(0,0,0,0));
info().iMetric = 0;<br>// KSolInetRtCtrl indicates we are manually making
// changes to the routing table, that way SetOpt()
// accepts the info parameter.
TInt ret = sock.SetOpt(KSoInetAddRoute,
                   KSolInetRtCtrl,
                   info);
if(ret == KerrNone)
{
// Start using the socket
}

S60 3rd Edition

This solution applies to S60 3rd Edition as well. However, note that the application requires NetworkControl capability when using RSocket::SetOpt() with KSoInetAddRoute option.