Visual FoxPro

SSL Server Example

See more Socket/SSL/TLS Examples

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. Visual FoxPro

LOCAL lnSuccess
LOCAL loListenSslSocket
LOCAL loCertStore
LOCAL loJsonCN
LOCAL loCert
LOCAL lnMyPort
LOCAL lnBackLog
LOCAL lnMaxWaitMillisec
LOCAL loClientSock
LOCAL lcReceivedMsg

lnSuccess = 0

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

loListenSslSocket = CreateObject('Chilkat.Socket')

* 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('Chilkat.CertStore')
* The 1st argument is the filename, the 2nd arg is the 
* PFX file's password:
lnSuccess = loCertStore.LoadPfxFile("chilkat.pfx","test")
IF (lnSuccess = 0) THEN
    ? loCertStore.LastErrorText
    RELEASE loListenSslSocket
    RELEASE loCertStore
    CANCEL
ENDIF

* Find the certificate to be used for SSL:
loJsonCN = CreateObject('Chilkat.JsonObject')
loJsonCN.UpdateString("CN","example.com")

loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCertStore.FindCert(loJsonCN,loCert)
IF (lnSuccess = 0) THEN
    ? loCertStore.LastErrorText
    RELEASE loListenSslSocket
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    CANCEL
ENDIF

* Use the certificate:
lnSuccess = loListenSslSocket.InitSslServer(loCert)
IF (lnSuccess = 0) THEN
    ? loListenSslSocket.LastErrorText
    RELEASE loListenSslSocket
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    CANCEL
ENDIF

* Bind and listen on a port:
lnMyPort = 8123
* Allow for a max of 5 queued connect requests.
lnBackLog = 5
lnSuccess = loListenSslSocket.BindAndListen(lnMyPort,lnBackLog)
IF (lnSuccess = 0) THEN
    ? loListenSslSocket.LastErrorText
    RELEASE loListenSslSocket
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    CANCEL
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 
* AcceptNext can hang indefinitely during the SSL handshake process. 
* Make sure these properties are set to appropriate values before calling AcceptNext.

* 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 = CreateObject('Chilkat.Socket')
lnSuccess = loListenSslSocket.AcceptNext(lnMaxWaitMillisec,loClientSock)
IF (lnSuccess = 0) THEN
    ? loListenSslSocket.LastErrorText
    RELEASE loListenSslSocket
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    RELEASE loClientSock
    CANCEL
ENDIF

* The client (in this example) is going to send a "Hello Server! -EOM-" 
* message.  Read it:
lcReceivedMsg = loClientSock.ReceiveUntilMatch("-EOM-")
IF (loClientSock.LastMethodSuccess = 0) THEN
    ? loClientSock.LastErrorText
    RELEASE loListenSslSocket
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    RELEASE loClientSock
    CANCEL
ENDIF

? lcReceivedMsg

* Send a "Hello Client! -EOM-" message:
lnSuccess = loClientSock.SendString("Hello Client! -EOM-")
IF (lnSuccess = 0) THEN
    ? loClientSock.LastErrorText
    RELEASE loListenSslSocket
    RELEASE loCertStore
    RELEASE loJsonCN
    RELEASE loCert
    RELEASE loClientSock
    CANCEL
ENDIF

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

RELEASE loListenSslSocket
RELEASE loCertStore
RELEASE loJsonCN
RELEASE loCert
RELEASE loClientSock