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(Java) 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.
import com.chilkatsoft.*; public class ChilkatExample { static { try { System.loadLibrary("chilkat"); } catch (UnsatisfiedLinkError e) { System.err.println("Native code library failed to load.\n" + e); System.exit(1); } } public static void main(String argv[]) { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkSsh ssh1 = new CkSsh(); // Connect directly to the 1st SSH server. boolean success = ssh1.Connect("serverssh1.com",22); if (success != true) { System.out.println(ssh1.lastErrorText()); return; } // Authenticate using login/password: success = ssh1.AuthenticatePw("ssh1Login","ssh1Password"); if (success != true) { System.out.println(ssh1.lastErrorText()); return; } // 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. CkSsh ssh2 = new CkSsh(); success = ssh2.ConnectThroughSsh(ssh1,"serverssh2.com",22); if (success != true) { System.out.println(ssh2.lastErrorText()); return; } // Authenticate with ssh2... success = ssh2.AuthenticatePw("ssh2Login","ssh2Password"); if (success != true) { System.out.println(ssh2.lastErrorText()); return; } CkSocket socket = new CkSocket(); // 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) { System.out.println(socket.lastErrorText()); return; } // Connect using TLS to www.chilkatsoft.com // We could also tunnel a bare TCP connection by specifying port 80 with useTls = false. boolean useTls = true; int maxWaitMillisec = 20000; success = socket.Connect("www.chilkatsoft.com",443,useTls,maxWaitMillisec); if (success != true) { System.out.println(socket.lastErrorText()); return; } // 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) { System.out.println(socket.lastErrorText()); return; } // 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" String responseStatusLine = socket.receiveToCRLF(); if (socket.get_LastMethodSuccess() != true) { System.out.println(socket.lastErrorText()); return; } System.out.println("StatusLine: " + responseStatusLine); // Now get the 1st line of the response header: String responseHeaderLine = socket.receiveToCRLF(); if (socket.get_LastMethodSuccess() != true) { System.out.println(socket.lastErrorText()); return; } System.out.println("HeaderLine: " + responseHeaderLine); // Now read the remainder of the response header by reading until a double CRLF is seen: String remainderOfHeader = socket.receiveUntilMatch("\r\n\r\n"); if (socket.get_LastMethodSuccess() != true) { System.out.println(socket.lastErrorText()); return; } System.out.println("Remainder: " + remainderOfHeader); // 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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