(C++) IMAP SSH Tunneling (Port Forwarding)

Demonstrates how to setup and use an SSH tunnel for IMAP.

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#include <CkImap.h>
#include <CkEmail.h>

void ChilkatSample(void)
    {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkImap imap;

    // The SSH hostname may be a hostname or an 
    // IP address, such as "192.168.1.108".
    // The port is typically 22 (the standard port for SSH).
    const char *sshHostname = "www.mysshserver.com";
    int sshPort = 22;

    // Connect to an SSH server and establish the SSH tunnel:
    bool success = imap.SshOpenTunnel(sshHostname,sshPort);
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        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 = imap.SshAuthenticatePw("mySshLogin","mySshPassword");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // OK, the SSH tunnel is setup.  The IMAP component may
    // be used exactly the same as usual, except all communications
    // are sent through the SSH tunnel.

    // Connect to an IMAP server via the 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.put_Ssl(true);
    imap.put_Port(993);
    success = imap.Connect("imap.my-imap-server.com");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Authenticate with the IMAP server via the SSH tunnel.
    success = imap.Login("myLogin","myPassword");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // How many messages in Inbox?
    int msgCount = imap.get_NumMessages();
    if (msgCount == 0) {
        std::cout << "No messages found." << "\r\n";
        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++) {

        CkEmail *email = imap.FetchSingle(i,bUid);
        if (imap.get_LastMethodSuccess() == false) {
            std::cout << imap.lastErrorText() << "\r\n";
            return;

        }
        else {
            std::cout << email->ck_from() << "\r\n";
            std::cout << email->subject() << "\r\n";
            std::cout << "----" << "\r\n";

            delete email;
        }

    }

    // Disconnect from the IMAP server.
    // The SSH tunnel remains open.
    success = imap.Disconnect();
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        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) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Review the LastErrorText to see that the connection was made via the SSH tunnel:
    std::cout << imap.lastErrorText() << "\r\n";

    success = imap.Disconnect();
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Finally, close the SSH tunnel.
    success = imap.SshCloseTunnel();
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "IMAP SSH tunneling example completed." << "\r\n";
    }