(Swift 2) SSL Server Example

Demonstrates how to create an SSL socket for accepting connections. This example is *very* simple in that it will create an SSL socket for accepting a single connection. It will read a message from the client, send a reply, and exit.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let listenSslSocket = CkoSocket()

    // An SSL server needs a digital certificate.  This example loads it from a PFX file.

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it.
    // (a PFX file may contain more than one certificate.)
    let certStore = CkoCertStore()
    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    var success: Bool = certStore.LoadPfxFile("chilkat.pfx", password: "test")
    if success != true {
        print("\(certStore.LastErrorText)")
        return
    }

    // Find the certificate to be used for SSL:
    var cert: CkoCert?
    cert = certStore.FindCertBySubject("Chilkat Software, Inc.")
    if certStore.LastMethodSuccess == false {
        print("\(certStore.LastErrorText)")
        return
    }

    // Use the certificate:
    success = listenSslSocket.InitSslServer(cert)
    if success != true {
        cert = nil
        print("\(listenSslSocket.LastErrorText)")
        return
    }

    cert = nil

    // Bind and listen on a port:
    var myPort: Int = 8123
    // Allow for a max of 5 queued connect requests.
    var backLog: Int = 5
    success = listenSslSocket.BindAndListen(myPort, backlog: backLog)
    if success != true {
        print("\(listenSslSocket.LastErrorText)")
        return
    }

    // If accepting an SSL/TLS connection, the SSL handshake is part of the connection
    // establishment process. This involves a few back-and-forth messages between the 
    // client and server to establish algorithms and a shared key to create the secure 
    // channel. The sending and receiving of these messages are governed by the 
    // MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
    // (and this is the default unless changed by your application), then the 
    // AcceptNextConnection can hang indefinitely during the SSL handshake process. 
    // Make sure these properties are set to appropriate values before calling AcceptNextConnection.

    // Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
    listenSslSocket.MaxReadIdleMs = 10000
    listenSslSocket.MaxSendIdleMs = 10000

    // Accept a single client connection and establish the secure SSL/TLS channel:
    var clientSock: CkoSocket?
    var maxWaitMillisec: Int = 20000
    clientSock = listenSslSocket.AcceptNextConnection(maxWaitMillisec)
    if listenSslSocket.LastMethodSuccess == false {
        print("\(listenSslSocket.LastErrorText)")
        return
    }

    // The client (in this example) is going to send a "Hello Server! -EOM-" 
    // message.  Read it:
    var receivedMsg: String? = clientSock!.ReceiveUntilMatch("-EOM-")
    if clientSock!.LastMethodSuccess != true {
        print("\(clientSock!.LastErrorText)")
        return
    }

    print("\(receivedMsg!)")

    // Send a "Hello Client! -EOM-" message:
    success = clientSock!.SendString("Hello Client! -EOM-")
    if success != true {
        print("\(clientSock!.LastErrorText)")
        return
    }

    // Close the connection with the client
    // Wait a max of 20 seconds (20000 millsec)
    success = clientSock!.Close(20000)

    clientSock = nil

}