Lua Requires Chilkat v11.0.0+

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

Lua

    -- In the following call to loadlib, change the path (./chilkat.dll) to the relative or absolute directory where the chilkat.dll, chilkat.so, or chilkat.dylib is located.
    chilkat = assert(package.loadlib("./chilkat.dll", "luaopen_chilkat"))()
    print(chilkat._VERSION)

    local success = false

    --  This example requires the Chilkat API to have been previously unlocked.
    --  See Global Unlock Sample for sample code.

    local ssh1 = chilkat.newSsh{}

    --  Connect directly to the 1st SSH server.
    success = ssh1:Connect("serverssh1.com",22)
    if success == false then
        print(ssh1:LastErrorText())

    end

    --  Authenticate using login/password:
    success = ssh1:AuthenticatePw("ssh1Login","ssh1Password")
    if success == false then
        print(ssh1:LastErrorText())

    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.
    local ssh2 = chilkat.newSsh{}
    success = ssh2:ConnectThroughSsh(ssh1,"serverssh2.com",22)
    if success == false then
        print(ssh2:LastErrorText())

    end

    --  Authenticate with ssh2...
    success = ssh2:AuthenticatePw("ssh2Login","ssh2Password")
    if success == false then
        print(ssh2:LastErrorText())

    end

    local mailman = chilkat.newMailMan{}

    --  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 == false then
        print(mailman:LastErrorText())

    end

    --  Set the POP3 server's hostname
    mailman:setMailHost("pop.example.com")

    --  Set the POP3 login/password.
    mailman:setPopUsername("myLogin")
    mailman:setPopPassword("myPassword")

    --  Establish the POP3 connection through the ssh2 tunnel.
    success = mailman:Pop3BeginSession()
    if success == false then
        print(mailman:LastErrorText())

    end

    --  Get the number of messages in the mailbox.
    local numMessages = mailman:GetMailboxCount()

    local email = chilkat.newEmail{}
    local i = 1
    while i <= numMessages do
        --  Fetch by the message number (not by the UIDL)
        success = mailman:FetchOne(false,0,i,email)
        if success == false then
            print(mailman:LastErrorText())

        end

        print(email:From(), ": ", email:Subject(), "\n")

        i = i + 1
    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()