(Lianja) 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.

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

loListenSslSocket = createobject("CkSocket")

// 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.)
loCertStore = createobject("CkCertStore")
// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
llSuccess = loCertStore.LoadPfxFile("chilkat.pfx","test")
if (llSuccess <> .T.) then
    ? loCertStore.LastErrorText
    release loListenSslSocket
    release loCertStore
    return
endif

// Find the certificate to be used for SSL:

loCert = loCertStore.FindCertBySubject("Chilkat Software, Inc.")
if (loCertStore.LastMethodSuccess = .F.) then
    ? loCertStore.LastErrorText
    release loListenSslSocket
    release loCertStore
    return
endif

// Use the certificate:
llSuccess = loListenSslSocket.InitSslServer(loCert)
if (llSuccess <> .T.) then
    release loCert
    ? loListenSslSocket.LastErrorText
    release loListenSslSocket
    release loCertStore
    return
endif

release loCert

// Bind and listen on a port:
lnMyPort = 8123
// Allow for a max of 5 queued connect requests.
lnBackLog = 5
llSuccess = loListenSslSocket.BindAndListen(lnMyPort,lnBackLog)
if (llSuccess <> .T.) then
    ? loListenSslSocket.LastErrorText
    release loListenSslSocket
    release loCertStore
    return
endif

// 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.
loListenSslSocket.MaxReadIdleMs = 10000
loListenSslSocket.MaxSendIdleMs = 10000

// Accept a single client connection and establish the secure SSL/TLS channel:

lnMaxWaitMillisec = 20000
loClientSock = loListenSslSocket.AcceptNextConnection(lnMaxWaitMillisec)
if (loListenSslSocket.LastMethodSuccess = .F.) then
    ? loListenSslSocket.LastErrorText
    release loListenSslSocket
    release loCertStore
    return
endif

// The client (in this example) is going to send a "Hello Server! -EOM-" 
// message.  Read it:
lcReceivedMsg = loClientSock.ReceiveUntilMatch("-EOM-")
if (loClientSock.LastMethodSuccess <> .T.) then
    ? loClientSock.LastErrorText
    release loListenSslSocket
    release loCertStore
    return
endif

? lcReceivedMsg

// Send a "Hello Client! -EOM-" message:
llSuccess = loClientSock.SendString("Hello Client! -EOM-")
if (llSuccess <> .T.) then
    ? loClientSock.LastErrorText
    release loListenSslSocket
    release loCertStore
    return
endif

// Close the connection with the client
// Wait a max of 20 seconds (20000 millsec)
llSuccess = loClientSock.Close(20000)

release loClientSock


release loListenSslSocket
release loCertStore