(VB.NET) Multiple Hop SSH to SFTP

Demonstrates how to SFTP through an intermediate SSH server (multiple hop). The scheme looks like this:

Application => ServerSSH1 => ServerSFtp

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task.

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

Dim ssh1 As New Chilkat.Ssh

' Hostname may be an IP address or domain name:
Dim hostname As String = "192.168.1.111"
Dim port As String = 22

' Connect directly to the 1st SSH server:
Dim success As Boolean = ssh1.Connect(hostname,port)
If (success <> True) Then
    Debug.WriteLine(ssh1.LastErrorText)
    Exit Sub
End If


' Authenticate using login/password:
success = ssh1.AuthenticatePw("myLogin","myPassword")
If (success <> True) Then
    Debug.WriteLine(ssh1.LastErrorText)
    Exit Sub
End If



' Connect through the 1st SSH connection to reach a 2nd SSH server (for SFTP)
' Note: Any number of connections may be simultaneously tunneled through a single
' existing SSH connection.
Dim sftp As New Chilkat.SFtp


' Connect to some SSH/SFTP server through ssh1.
success = sftp.ConnectThroughSsh(ssh1,"sftp.someremoteserver.com",22)
If (success <> True) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


' Authenticate with the SFTP server. 
success = sftp.AuthenticatePw("myLogin","myPassword")
If (success <> True) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


' After authenticating, the SFTP subsystem must be initialized:
success = sftp.InitializeSftp()
If (success <> True) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


' Upload from the local file to the SSH server.
' Important -- the remote filepath is the 1st argument,
' the local filepath is the 2nd argument;
Dim remoteFilePath As String = "hamlet.xml"
Dim localFilePath As String = "c:/temp/hamlet.xml"

success = sftp.UploadFileByName(remoteFilePath,localFilePath)
If (success <> True) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Success.")

' Close the connection with the SFTP server.(This closes the the tunnel through ssh1.)
' The connection with ssh1 is still alive, and may be used for more connections.
sftp.Disconnect()

' ...
' ...
' ...


ssh1.Disconnect()