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(Ruby) POP3 over Multiple Hop SSH

Demonstrates how to read POP3 email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => POP3Server

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

Chilkat Ruby Downloads

Ruby Library for Linux and MAC OS X

require 'chilkat'

#  Important: It is helpful to send the contents of the
#  ssh.LastErrorText property when requesting support.

ssh1 = Chilkat::CkSsh.new()

#  Any string automatically begins a fully-functional 30-day trial.
success = ssh1.UnlockComponent("Anything for 30-day trial")
if (success != true)
    print ssh1.lastErrorText() + "\n";
    exit
end

#  Connect directly to the 1st SSH server.
success = ssh1.Connect("serverssh1.com",22)
if (success != true)
    print ssh1.lastErrorText() + "\n";
    exit
end

#  Authenticate using login/password:
success = ssh1.AuthenticatePw("ssh1Login","ssh1Password")
if (success != true)
    print ssh1.lastErrorText() + "\n";
    exit
end

#  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::CkSsh.new()
success = ssh2.ConnectThroughSsh(ssh1,"serverssh2.com",22)
if (success != true)
    print ssh2.lastErrorText() + "\n";
    exit
end

#  Authenticate with ssh2...
success = ssh2.AuthenticatePw("ssh2Login","ssh2Password")
if (success != true)
    print ssh2.lastErrorText() + "\n";
    exit
end

mailman = Chilkat::CkMailMan.new()

#  Any string argument automatically begins the 30-day trial.
success = mailman.UnlockComponent("30-day trial")
if (success != true)
    print mailman.lastErrorText() + "\n";
    exit
end

#  Tell the mailman object to connect to the POP3 server though the ssh2 tunnel (which itself is routed through ssh1).
#  The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => POP3Server
success = mailman.UseSsh(ssh2)
if (success != true)
    print mailman.lastErrorText() + "\n";
    exit
end

#  Set the POP3 server's hostname
mailman.put_MailHost("pop.someMailServer.com")

#  Set the POP3 login/password.
mailman.put_PopUsername("myLogin")
mailman.put_PopPassword("myPassword")

#  Establish the POP3 connection through the ssh2 tunnel.
success = mailman.Pop3BeginSession()
if (success != true)
    print mailman.lastErrorText() + "\n";
    exit
end

#  Get the number of messages in the mailbox.
numMessages = mailman.GetMailboxCount()

if (numMessages > 0)

    for i in 1 .. numMessages

        # email is a CkEmail
        email = mailman.FetchByMsgnum(i)
        if (email == nil )
            print mailman.lastErrorText() + "\n";
            exit
        else
            print email.ck_from() + ": " + email.subject() + "\n" + "\n";

        end

    end

end

#  Close the connection with the POP3 server.  (This closes the tunnel through ssh2)
#  The connection with ssh2 is still alive, and may be used for more connections.
success = mailman.Pop3EndSession()

#  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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