Writing a Client Program That Uses RWSecureSocketPortal

SourcePro Net : Secure Communication Module User’s Guide : PART II Secure Sockets Package : Using Secure Sockets : Getting Started with Secure Sockets : Writing a Client Program That Uses RWSecureSocketPortal

Example 2 is a client program that uses a portal to create a secure socket and send a message. This client is identical to the client in Example 1, except that it uses the Portal layer classes.

This example uses utility functions provided in args.h.

Example 2 – Client program that uses RWSecureSocketPortal

// File: examples\secsock\manual\RWSecureSocketPortalSimpleClient.cpp

#include <rw/secsock/RWSecureSocketContext.h>

#include <rw/secsock/RWSecureSocketPackageInit.h>

#include <rw/secsock/RWSecureSocketPortal.h>

#include <rw/network/RWInetAddr.h>

#include <rw/network/RWWinSockInfo.h>

#include <iostream>

#include "args.h"

#include "secsockexampledefs.h"

using std::cout;

using std::cerr;

using std::endl;

int main(int argc, char **argv)

{

try {

RWWinSockInfo info;

RWSecureSocketPackageInit secsockInit;

#if defined(RW_SECSOCK_RNG_NEEDS_SEEDING)

RWSecureSocketPackageInit::seedRNGFromFile(SEED_DATA_FILE);

#endif

int port = parseClientCommandLine(argc, argv);

RWSecureSocketContext context;

context.prepareToAuthenticate(TRUSTED_CERTS_FILE);

RWInetAddr addr(port, "localhost");

RWSecureSocketPortal portal(addr, context); //1

portal.sendAtLeast("Hello World!"); //2

// portal goes out of scope here //3

} catch(const RWInternalErr& ie) {

cerr << ie.why() << endl;

return 1;

} catch(const RWExternalErr& ee) {

cerr << ee.why() << endl;

return 1;

}

return 0;

}

//1 Creates a portal to the specified address using the specified context. The portal automatically creates a socket and connects it to the address.

//2 Sends a message.

//3 Closes the underlying socket automatically, as long as no other part of the program is holding a copy of the portal. The destructors for RWWinSockInfo and RWSecureSocketPackageInit are also executed here to clean up the Windows socket library and the underlying cryptographic library.