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(Ruby) TCP or TLS over Multiple Hop SSH to Remote ServerDemonstrates how to use the Chilkat Socket API to connect to a remote server (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this: Application => ServerSSH1 => ServerSSH2 => DestinationServer The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.
require 'chilkat' # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. ssh1 = Chilkat::CkSsh.new() # Connect directly to the 1st SSH server. success = ssh1.Connect("serverssh1.com",22) if (success != true) print ssh1.lastErrorText() + "\n"; exit end # Authenticate using login/password: success = ssh1.AuthenticatePw("ssh1Login","ssh1Password") if (success != true) print ssh1.lastErrorText() + "\n"; exit end # Connect through the 1st SSH connection to reach a 2nd SSH server. # Note: Any number of SSH connections may be simultaneously tunneled through a single # existing SSH connection. ssh2 = Chilkat::CkSsh.new() success = ssh2.ConnectThroughSsh(ssh1,"serverssh2.com",22) if (success != true) print ssh2.lastErrorText() + "\n"; exit end # Authenticate with ssh2... success = ssh2.AuthenticatePw("ssh2Login","ssh2Password") if (success != true) print ssh2.lastErrorText() + "\n"; exit end socket = Chilkat::CkSocket.new() # Tell the socket object to connect to our destination server though the ssh2 tunnel (which itself is routed through ssh1). # The connection looks like this: ApplicationSocket(TLS) => ServerSSH1 => ServerSSH2 => DestinationServer success = socket.UseSsh(ssh2) if (success != true) print socket.lastErrorText() + "\n"; exit end # Connect using TLS to www.chilkatsoft.com # We could also tunnel a bare TCP connection by specifying port 80 with useTls = false. useTls = true maxWaitMillisec = 20000 success = socket.Connect("www.chilkatsoft.com",443,useTls,maxWaitMillisec) if (success != true) print socket.lastErrorText() + "\n"; exit end # Once the multiple hop SSH tunneled connection is setup, the socket programming # is identical to the normal case where we have a direct connection. # Tell the socket object that all text is to be sent in the utf-8 encoding, # and the text received is assumed to be utf-8. socket.put_StringCharset("utf-8") # Send an HTTP HEAD request: success = socket.SendString("HEAD / HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n") if (success != true) print socket.lastErrorText() + "\n"; exit end # Wait a maximum of 4 seconds while no data is forthcoming: socket.put_MaxReadIdleMs(4000) # Get the 1st response line, which should be "HTTP/1.1 200 OK" responseStatusLine = socket.receiveToCRLF() if (socket.get_LastMethodSuccess() != true) print socket.lastErrorText() + "\n"; exit end print "StatusLine: " + responseStatusLine + "\n"; # Now get the 1st line of the response header: responseHeaderLine = socket.receiveToCRLF() if (socket.get_LastMethodSuccess() != true) print socket.lastErrorText() + "\n"; exit end print "HeaderLine: " + responseHeaderLine + "\n"; # Now read the remainder of the response header by reading until a double CRLF is seen: remainderOfHeader = socket.receiveUntilMatch("\r\n\r\n") if (socket.get_LastMethodSuccess() != true) print socket.lastErrorText() + "\n"; exit end print "Remainder: " + remainderOfHeader + "\n"; # Close the connection with the server. This closes the tunnel through ssh2. # Wait a max of 20 seconds (20000 millsec) success = socket.Close(20000) # Close the connection with ssh2. (This closes the the tunnel through ssh1.) # The connection with ssh1 is still alive, and may be used for more connections. ssh2.Disconnect() ssh1.Disconnect() |
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