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(C#) SMTP over Multiple Hop SSHDemonstrates how to send email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this: Application => ServerSSH1 => ServerSSH2 => SmtpServer The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Ssh ssh1 = new Chilkat.Ssh(); // Connect directly to the 1st SSH server. bool success = ssh1.Connect("serverssh1.com",22); if (success != true) { Debug.WriteLine(ssh1.LastErrorText); return; } // Authenticate using login/password: success = ssh1.AuthenticatePw("ssh1Login","ssh1Password"); if (success != true) { Debug.WriteLine(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. Chilkat.Ssh ssh2 = new Chilkat.Ssh(); success = ssh2.ConnectThroughSsh(ssh1,"serverssh2.com",22); if (success != true) { Debug.WriteLine(ssh2.LastErrorText); return; } // Authenticate with ssh2... success = ssh2.AuthenticatePw("ssh2Login","ssh2Password"); if (success != true) { Debug.WriteLine(ssh2.LastErrorText); return; } Chilkat.MailMan mailman = new Chilkat.MailMan(); // Tell the mailman object to connect to the SMTP server though the ssh2 tunnel (which itself is routed through ssh1). // The connection looks like this: Application => ServerSSH1 => ServerSSH2 => SMTPServer success = mailman.UseSsh(ssh2); if (success != true) { Debug.WriteLine(mailman.LastErrorText); return; } // Set the SMTP server. mailman.SmtpHost = "smtp.someserver.com"; // Set the SMTP login/password (if required) mailman.SmtpUsername = "myUsername"; mailman.SmtpPassword = "myPassword"; // Create a new email object Chilkat.Email email = new Chilkat.Email(); email.Subject = "This is a test"; email.Body = "This is a test"; email.From = "Chilkat Support <support@chilkatsoft.com>"; success = email.AddTo("Chilkat Admin","admin@chilkatsoft.com"); success = mailman.SendEmail(email); if (success != true) { Debug.WriteLine(mailman.LastErrorText); return; } // Close the connection with the server. This closes the tunnel through ssh2. success = mailman.CloseSmtpConnection(); if (success != true) { Debug.WriteLine("Connection to SMTP server not closed cleanly."); } Debug.WriteLine("Mail Sent!"); // 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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