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(Java) IMAP SSH Tunneling (Port Forwarding)Demonstrates how to setup and use an SSH tunnel for IMAP. Note: This example requires Chilkat v11.0.0 or greater.
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[]) { boolean success = false; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkImap imap = new CkImap(); // The SSH hostname may be a hostname or an // IP address, such as "192.168.1.108". // The port is typically 22 (the standard port for SSH). String sshHostname = "www.mysshserver.com"; int sshPort = 22; // Connect to an SSH server and establish the SSH tunnel: success = imap.SshOpenTunnel(sshHostname,sshPort); if (success == false) { System.out.println(imap.lastErrorText()); return; } // Authenticate with the SSH server via a login/password // or with a public key. // This example demonstrates SSH password authentication. // Note: This is not authenticating with the IMAP server, it is // for authenticating with the SSH server, which is separate. success = imap.SshAuthenticatePw("mySshLogin","mySshPassword"); if (success == false) { System.out.println(imap.lastErrorText()); return; } // OK, the SSH tunnel is setup. The IMAP component may // be used exactly the same as usual, except all communications // are sent through the SSH tunnel. // Connect to an IMAP server via the SSH tunnel. // Because the SSH tunnel has been previously setup, // this does not establish a direct connection with the IMAP // server. It directs the SSH server to establish the connection. // In this example, the IMAP server requires SSL/TLS. The TLS connection // will be enclosed within the SSH tunnel. imap.put_Ssl(true); imap.put_Port(993); success = imap.Connect("imap.my-imap-server.com"); if (success == false) { System.out.println(imap.lastErrorText()); return; } // Authenticate with the IMAP server via the SSH tunnel. success = imap.Login("myLogin","myPassword"); if (success == false) { System.out.println(imap.lastErrorText()); return; } // Select an IMAP mailbox success = imap.SelectMailbox("Inbox"); if (success == false) { System.out.println(imap.lastErrorText()); return; } // How many messages in Inbox? int msgCount = imap.get_NumMessages(); if (msgCount == 0) { System.out.println("No messages found."); return; } int upperBound = 10; if (msgCount < upperBound) { upperBound = msgCount; } // Download up to the 1st 10 messages. CkEmail email = new CkEmail(); int i; boolean bUid = false; for (i = 1; i <= upperBound; i++) { success = imap.FetchEmail(false,i,bUid,email); if (success == false) { System.out.println(imap.lastErrorText()); return; } System.out.println(email.ck_from()); System.out.println(email.subject()); System.out.println("----"); } // Disconnect from the IMAP server. // The SSH tunnel remains open. success = imap.Disconnect(); if (success == false) { System.out.println(imap.lastErrorText()); return; } // It is possible to re-use the existing SSH tunnel for the next connection: success = imap.Connect("imap.my-imap-server2.com"); if (success == false) { System.out.println(imap.lastErrorText()); return; } // Review the LastErrorText to see that the connection was made via the SSH tunnel: System.out.println(imap.lastErrorText()); success = imap.Disconnect(); if (success == false) { System.out.println(imap.lastErrorText()); return; } // Finally, close the SSH tunnel. success = imap.SshCloseTunnel(); if (success == false) { System.out.println(imap.lastErrorText()); return; } System.out.println("IMAP SSH tunneling example completed."); } } |
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