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(C#) IMAP Use Existing SSH TunnelDemonstrates how to connect to an IMAP server using an existing SSH tunnel. This creates a new channel within the SSH tunnel, which can be a TCP or TLS connection, and is connected to a remote IMAP server through port forwarding.
// Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program // by calling UnlockBundle. It requires a Bundle unlock code. Chilkat.Global chilkatGlob = new Chilkat.Global(); bool success = chilkatGlob.UnlockBundle("Anything for 30-day trial."); if (success != true) { Debug.WriteLine(chilkatGlob.LastErrorText); return; } Chilkat.Socket tunnel = new Chilkat.Socket(); bool success; string sshHostname = "www.my-ssh-server.com"; int sshPort = 22; // Connect to an SSH server and establish the SSH tunnel: success = tunnel.SshOpenTunnel(sshHostname,sshPort); if (success != true) { Debug.WriteLine(tunnel.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 = tunnel.SshAuthenticatePw("mySshLogin","mySshPassword"); if (success != true) { Debug.WriteLine(tunnel.LastErrorText); return; } // OK, the SSH tunnel is setup. Now open a channel within the tunnel. // Once the channel is obtained, the Socket API may // be used exactly the same as usual, except all communications // are sent through the channel in the SSH tunnel. // Any number of channels may be created from the same SSH tunnel. // Multiple channels may coexist at the same time. Chilkat.Imap imap = new Chilkat.Imap(); // Let the IMAP object also use the SSH tunnel success = imap.UseSshTunnel(tunnel); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // Connect to an IMAP server via the already established 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.Ssl = true; imap.Port = 993; success = imap.Connect("imap.my-imap-server.com"); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // Authenticate with the IMAP server via the SSH tunnel. success = imap.Login("myLogin","myPassword"); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // Select an IMAP mailbox success = imap.SelectMailbox("Inbox"); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // How many messages in Inbox? int msgCount = imap.NumMessages; if (msgCount == 0) { Debug.WriteLine("No messages found."); return; } int upperBound = 10; if (msgCount < upperBound) { upperBound = msgCount; } // Download up to the 1st 10 messages. int i; bool bUid = false; for (i = 1; i <= upperBound; i++) { Chilkat.Email email = imap.FetchSingle(i,bUid); if (imap.LastMethodSuccess == false) { Debug.WriteLine(imap.LastErrorText); return; } else { Debug.WriteLine(email.From); Debug.WriteLine(email.Subject); Debug.WriteLine("----"); } } // Disconnect from the IMAP server. // The SSH tunnel remains open. success = imap.Disconnect(); if (success != true) { Debug.WriteLine(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 != true) { Debug.WriteLine(imap.LastErrorText); return; } // Review the LastErrorText to see that the connection was made via the SSH tunnel: Debug.WriteLine(imap.LastErrorText); // This closes the SSH channel, which is the connection with the IMAP server. // It does not close the SSH tunnel success = imap.Disconnect(); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // Finally, close the SSH tunnel. // Note: If other objects are using the same SSH tunnel, the tunnel is not // actually closed. It is only closed when the last object using the tunnel closes it. // At this point, both the imap and tunnel objects have references to the internal // SSH tunnel. We need to close each. // This call doesn't actually close the tunnel yet, because the tunnel object still // holds an internal reference. success = imap.SshCloseTunnel(); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // This actually closes the SSH tunnel because it's the last object using it. success = tunnel.SshCloseTunnel(); if (success != true) { Debug.WriteLine(tunnel.LastErrorText); return; } Debug.WriteLine("IMAP pre-existing SSH tunnel example completed."); |
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