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(Go) 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. ssh1 := chilkat.NewSsh() // Connect directly to the 1st SSH server. success := ssh1.Connect("serverssh1.com",22) if success != true { fmt.Println(ssh1.LastErrorText()) ssh1.DisposeSsh() return } // Authenticate using login/password: success = ssh1.AuthenticatePw("ssh1Login","ssh1Password") if success != true { fmt.Println(ssh1.LastErrorText()) ssh1.DisposeSsh() 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. ssh2 := chilkat.NewSsh() success = ssh2.ConnectThroughSsh(ssh1,"serverssh2.com",22) if success != true { fmt.Println(ssh2.LastErrorText()) ssh1.DisposeSsh() ssh2.DisposeSsh() return } // Authenticate with ssh2... success = ssh2.AuthenticatePw("ssh2Login","ssh2Password") if success != true { fmt.Println(ssh2.LastErrorText()) ssh1.DisposeSsh() ssh2.DisposeSsh() return } mailman := chilkat.NewMailMan() // 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 { fmt.Println(mailman.LastErrorText()) ssh1.DisposeSsh() ssh2.DisposeSsh() mailman.DisposeMailMan() return } // Set the SMTP server. mailman.SetSmtpHost("smtp.someserver.com") // Set the SMTP login/password (if required) mailman.SetSmtpUsername("myUsername") mailman.SetSmtpPassword("myPassword") // Create a new email object email := chilkat.NewEmail() email.SetSubject("This is a test") email.SetBody("This is a test") email.SetFrom("Chilkat Support <support@chilkatsoft.com>") success = email.AddTo("Chilkat Admin","admin@chilkatsoft.com") success = mailman.SendEmail(email) if success != true { fmt.Println(mailman.LastErrorText()) ssh1.DisposeSsh() ssh2.DisposeSsh() mailman.DisposeMailMan() email.DisposeEmail() return } // Close the connection with the server. This closes the tunnel through ssh2. success = mailman.CloseSmtpConnection() if success != true { fmt.Println("Connection to SMTP server not closed cleanly.") } fmt.Println("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() ssh1.DisposeSsh() ssh2.DisposeSsh() mailman.DisposeMailMan() email.DisposeEmail() |
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