POP3 SSH Tunneling (Port Forwarding)

Demonstrates how to connect to a POP3 server through an SSH tunnel. Reads a POP3 mailbox and display the FROM and SUBJECT header fields of each email.

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MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

// Needs #include <CkMailMan.h>
// Needs #include <CkEmailBundle.h>
// Needs #include <CkEmail.h>

    CkString strOut;

    //  The mailman object is used for receiving (POP3)
    //  and sending (SMTP) email.
    CkMailMan mailman;

    //  Any string argument automatically begins the 30-day trial.
    bool success;
    success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        strOut.append("Component unlock failed\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Connect to an SSH server and establish the SSH tunnel:
    const char * sshHostname;
    long sshPort;
    bool bForSmtp;
    //  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).
    sshHostname = "www.my-ssh-server.com";
    sshPort = 22;
    //  Select POP3 by setting the following variable to false
    bForSmtp = false;
    //  The 1st argument passed to SshTunnel indicates whether
    //  a tunnel for SMTP or POP3 is being established.
    success = mailman.SshTunnel(bForSmtp,sshHostname,sshPort);
    if (success != true) {
        strOut.append(mailman.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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 POP3 server, it is
    //  for authenticating with the SSH server, which is separate.
    success = mailman.SshAuthenticatePw(bForSmtp,"ssh_login","ssh_password");
    if (success != true) {
        strOut.append(mailman.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

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

    //  Set the POP3 server's hostname
    mailman.put_MailHost("mail.chilkatsoft.com");

    //  Set the POP3 login/password.
    mailman.put_PopUsername("pop3_login");
    mailman.put_PopPassword("pop3_password");

    //  Download a max of 5 messages
    //  To download all email, leave MaxCount unset so it remains at the default value of 0.
    mailman.put_MaxCount(5);

    CkEmailBundle *bundle = 0;
    //  Copy the all email from the user's POP3 mailbox
    //  into a bundle object.  The email remains on the server.
    bundle = mailman.CopyMail();

    //  If you're curious, have a look at LastErrorText after
    //  a successful send.  You'll see detailed information that
    //  confirms the SSH tunneling.
    strOut.append(mailman.lastErrorText());
    strOut.append("\r\n");

    if (bundle == 0 ) {
        strOut.append(mailman.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    long i;
    CkEmail *email = 0;
    for (i = 0; i <= bundle->get_MessageCount() - 1; i++) {
        email = bundle->GetEmail(i);
        strOut.append(email->ck_from());
        strOut.append("\r\n");
        strOut.append(email->subject());
        strOut.append("\r\n");
        strOut.append("\r\n");
        delete email;
    }

    delete bundle;

    //  Close the connection (with both SSH server and POP3 server)
    mailman.Pop3EndSession();

    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());