DataFlex

SSH Tunnel (Port Forwarding via direct-tcpip channel)

See more SSH Examples

Demonstrates how to create an SSH tunnel to a remote hostname:port via a direct-tcpip channel. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSsh
    String sHostname
    Integer iPort
    Integer iChannelNum
    String sHttpReq
    Boolean iCaseSensitive
    String sMatchStr
    String sResponseHeader
    Integer iNumBytesRead
    Integer iPollTimeoutMs
    String sHtmlBody
    String sTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatSsh)) To hoSsh
    If (Not(IsComObjectCreated(hoSsh))) Begin
        Send CreateComObject of hoSsh
    End

    // Connect to an SSH server:

    // Hostname may be an IP address or hostname:
    Move "192.168.1.117" To sHostname
    Move 22 To iPort

    Get ComConnect Of hoSsh sHostname iPort To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Wait a max of 5 seconds when reading responses..
    Set ComIdleTimeoutMs Of hoSsh To 5000

    // Authenticate using login/password:
    Get ComAuthenticatePw Of hoSsh "chilkat" "myPassword" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Open a direct-tcpip channel.  We want the SSH server to connect
    // to www.chilkatsoft.com, port 80 (i.e. the web server).
    // Data sent through the SSH tunnel is forwarded to the remote
    // host:port.  (Note: The remote host:port does not need to be 
    // a web server.  It can be anything.  It can be your own
    // customer application server that listens on a port, or any
    // other type of server.)
    // When we read from the SSH channel, we'll be reading data
    // sent from the remote host:port (i.e. the web server in this
    // example).

    Get ComOpenDirectTcpIpChannel Of hoSsh "www.chilkatsoft.com" 80 To iChannelNum
    If (iChannelNum < 0) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
    Move "GET /xyz123.html HTTP/1.1" + (character(13)) + (character(10)) + "Host: www.chilkatsoft.com" + (character(13)) + (character(10)) + (character(13)) + (character(10)) To sHttpReq

    // Send the HTTP request:
    Get ComChannelSendString Of hoSsh iChannelNum sHttpReq "ansi" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the HTTP response.
    // First read the HTTP response header which ends with a double CRLF.
    // Calling ChannelReceiveUntilMatch will receive until match string is seen,
    // or until a timeout occurs (IdleTimeoutMs property).  ChannelReceiveUntilMatch
    // may read beyond the match string, but it will stop reading as soon as the match
    // string is seen.
    Move False To iCaseSensitive
    Move (character(13)) + (character(10)) + (character(13)) + (character(10)) To sMatchStr
    Get ComChannelReceiveUntilMatch Of hoSsh iChannelNum sMatchStr "ansi" iCaseSensitive To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Extract the HTTP header from the receive buffer.
    // (GetReceiveTextS extracts up to and including the match string from the receive buffer)

    Get ComGetReceivedTextS Of hoSsh iChannelNum sMatchStr "ansi" To sResponseHeader
    Showln "---- HTTP Response Header ----"
    Showln sResponseHeader

    // Now get the body of the HTTP response (this is the HTML content
    // of http://www.chilkatsoft.com/xyz.html
    // It's possible we've already received the entire HTTP response in the
    // call to ChannelReceiveUntilMatch.  Therefore, we'll poll for any remaining data
    // and wait a max of .2 seconds.

    Move 200 To iPollTimeoutMs
    Get ComChannelPoll Of hoSsh iChannelNum iPollTimeoutMs To iNumBytesRead
    // We're not checking for an error here.
    // A return value of -2 means that no data was available and the poll simply timed out (not an error)
    // A return value of -1 indicates an error.
    // A return value greater than 0 indicates that additional data was received.

    Showln "---- HTML BODY ----"

    // Extract the remainder of the accumulated data in the internal receive buffer.
    // This should be our HTML body:

    Get ComGetReceivedText Of hoSsh iChannelNum "ansi" To sHtmlBody
    Showln sHtmlBody

    // Close the channel:
    Get ComChannelSendClose Of hoSsh iChannelNum To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Disconnect
    Send ComDisconnect To hoSsh


End_Procedure