DataFlex

Using sudo in an SSH Shell Session

See more SSH Examples

Demonstrates how to run a command as sudo in a shell session. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSsh
    Integer iPort
    Integer iChannelNum
    Handle hoSbCommands
    String sTemp1

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

    Move 22 To iPort
    Get ComConnect Of hoSsh "the-ssh-server.com" iPort To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

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

    // Start a shell session.
    // (The QuickShell method was added in Chilkat v9.5.0.65)
    Get ComQuickShell Of hoSsh To iChannelNum
    If (iChannelNum < 0) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Construct a StringBuilder with our command ("ls") run with "sudo"
    // Note: The line-endings are potentially important.  Some SSH servers may
    // require either LF or CRLF line endings.  (Unix/Linux/OSX servers typically
    // use bare-LF line endings.  Windows servers likely use CRLF line endings.)

    // Using "sudo -S" causes the sudo prompt to be written to stderr,
    // and the password is read from stdin (i.e. from the echo command ouput).
    // The sudo commands -p option allows us to set the prompt, and we can set it to
    // the empty string, thus eliminating the prompt from the stderr completely.
    // This allows us to run the command as root (super-user) with no prompt.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbCommands
    If (Not(IsComObjectCreated(hoSbCommands))) Begin
        Send CreateComObject of hoSbCommands
    End
    Get ComAppend Of hoSbCommands 'echo "theSshPassword" | sudo -S -p "" ls' + (character(10)) To iSuccess

    // Add another command to echo a marker string that
    // we'll use in ChannelReceiveUntilMatch below.
    // The use of single quotes around 'IS' is a trick so that the output
    // of the command is "THIS IS THE END OF THE SCRIPT", but the terminal echo
    // includes the single quotes.  This allows us to read until we see the actual
    // output of the last command.
    Get ComAppend Of hoSbCommands "echo THIS 'IS' THE END OF THE SCRIPT" + (character(10)) To iSuccess

    // Send the commands..
    Get ComGetAsString Of hoSbCommands To sTemp1
    Get ComChannelSendString Of hoSsh iChannelNum sTemp1 "ansi" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoSsh To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Send an EOF to indicate no more commands will be sent.
    // For brevity, we're not checking the return values of each method call.
    // Your code should check the success/failure of each call.
    Get ComChannelSendEof Of hoSsh iChannelNum To iSuccess

    // Receive output up to our marker.
    Get ComChannelReceiveUntilMatch Of hoSsh iChannelNum "THIS IS THE END OF THE SCRIPT" "ansi" True To iSuccess

    // Close the channel.
    // It is important to close the channel only after receiving the desired output.
    Get ComChannelSendClose Of hoSsh iChannelNum To iSuccess

    // Get any remaining output..
    Get ComChannelReceiveToClose Of hoSsh iChannelNum To iSuccess

    // Get the complete output for all the commands in the session.
    Showln "--- output ----"
    Get ComGetReceivedText Of hoSsh iChannelNum "ansi" To sTemp1
    Showln sTemp1


End_Procedure