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(.NET Core C#) Socket Convert Existing TCP Connection to SSL/TLSDemonstrates the Chilkat Socket ConvertToSsl method.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Socket sock = new Chilkat.Socket(); // -------------------------------------------------------------------- // This example uses the public TCP/TLS echo service at https://tcpbin.com/ // -------------------------------------------------------------------- // The echo server at tcpbin.com expects to receive TCP connections on port 4242, and TLS connections on port 4243. // We could simply connect to port 4243 using TLS like this. // However, further below, this example shows how to initially make a TCP connection, and then convert the connection to TLS. bool useTls = true; int port = 4243; int maxWaitMs = 5000; bool success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs); if (success == false) { Debug.WriteLine(sock.LastErrorText); return; } // OK, we have a TLS connection. // Note: The server chooses the TLS protocol version. // We can see the version of the TLS connection that was established: Debug.WriteLine("TLS version: " + sock.TlsVersion); sock.Close(maxWaitMs); // --------------------------------------------------------------------- // Now we'll do the same, except first we connect to port 4243 using TCP, // and then convert the connection to TLS. // // This may seem pointless, and it is for the case w/ this server. However, there could be situations // where you're interacting with a server of some kind where there is a need to convert to/from TLS. // (This is common internal to many protocols, such as SMTP, IMAP, FTP, etc., and it is often called "explicit" SSL/TLS) // Connect again, except this time useTls is false, so we only have a simple TCP connection after this call. useTls = false; success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs); if (success == false) { Debug.WriteLine(sock.LastErrorText); return; } // Convert the existing TCP connection to TLS. // (The method name uses "SSL" because long ago, at the time of initial development, TLS 1.0 did not yet exist.) success = sock.ConvertToSsl(); if (success == false) { Debug.WriteLine(sock.LastErrorText); return; } // OK, we now have a TLS connection. // Again, we can see the TLS version: Debug.WriteLine("TLS version: " + sock.TlsVersion); sock.Close(maxWaitMs); |
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