DataFlex

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. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoListenSslSocket
    Variant vCert
Store    Handle hoCertStore
    Variant vJsonCN
    Handle hoJsonCN
    Variant vCert
    Handle hoCert
    Integer iMyPort
    Integer iBackLog
    Integer iMaxWaitMillisec
    Variant vClientSock
    Handle hoClientSock
    String sReceivedMsg
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatSocket)) To hoListenSslSocket
    If (Not(IsComObjectCreated(hoListenSslSocket))) Begin
        Send CreateComObject of hoListenSslSocket
    End

    // 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.)
    Get Create (RefClass(cComChilkatCertStore)) To hoCertStore
    If (Not(IsComObjectCreated(hoCertStore))) Begin
        Send CreateComObject of hoCertStore
    End
    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    Get ComLoadPfxFile Of hoCertStore "chilkat.pfx" "test" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCertStore To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Find the certificate to be used for SSL:
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonCN
    If (Not(IsComObjectCreated(hoJsonCN))) Begin
        Send CreateComObject of hoJsonCN
    End
    Get ComUpdateString Of hoJsonCN "CN" "example.com" To iSuccess

    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End
    Get pvComObject of hoJsonCN to vJsonCN
    Get pvComObject of hoCert to vCert
    Get ComFindCert Of hoCertStore vJsonCN vCert To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoCertStore To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Use the certificate:
    Get pvComObject of hoCert to vCert
    Get ComInitSslServer Of hoListenSslSocket vCert To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoListenSslSocket To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Bind and listen on a port:
    Move 8123 To iMyPort
    // Allow for a max of 5 queued connect requests.
    Move 5 To iBackLog
    Get ComBindAndListen Of hoListenSslSocket iMyPort iBackLog To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoListenSslSocket To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // 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.
    Set ComMaxReadIdleMs Of hoListenSslSocket To 10000
    Set ComMaxSendIdleMs Of hoListenSslSocket To 10000

    // Accept a single client connection and establish the secure SSL/TLS channel:
    Move 20000 To iMaxWaitMillisec
    Get Create (RefClass(cComChilkatSocket)) To hoClientSock
    If (Not(IsComObjectCreated(hoClientSock))) Begin
        Send CreateComObject of hoClientSock
    End
    Get pvComObject of hoClientSock to vClientSock
    Get ComAcceptNext Of hoListenSslSocket iMaxWaitMillisec vClientSock To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoListenSslSocket To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The client (in this example) is going to send a "Hello Server! -EOM-" 
    // message.  Read it:
    Get ComReceiveUntilMatch Of hoClientSock "-EOM-" To sReceivedMsg
    Get ComLastMethodSuccess Of hoClientSock To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoClientSock To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln sReceivedMsg

    // Send a "Hello Client! -EOM-" message:
    Get ComSendString Of hoClientSock "Hello Client! -EOM-" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoClientSock To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Close the connection with the client
    // Wait a max of 20 seconds (20000 millsec)
    Get ComClose Of hoClientSock 20000 To iSuccess


End_Procedure