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.

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

#include <C_CkMailMan.h>
#include <C_CkEmailBundle.h>
#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    HCkMailMan mailman;
    BOOL success;
    const char * sshHostname;
    long sshPort;
    BOOL bForSmtp;
    HCkEmailBundle bundle;
    long i;
    HCkEmail email;

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

    //  Any string argument automatically begins the 30-day trial.

    success = CkMailMan_UnlockComponent(mailman,"30-day trial");
    if (success != TRUE) {
        printf("Component unlock failed\n");
        return;
    }

    //  Connect to an SSH server and establish the SSH tunnel:

    //  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 = CkMailMan_SshTunnel(mailman,bForSmtp,sshHostname,sshPort);
    if (success != TRUE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        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 = CkMailMan_SshAuthenticatePw(mailman,bForSmtp,"ssh_login","ssh_password");
    if (success != TRUE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        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
    CkMailMan_putMailHost(mailman,"mail.chilkatsoft.com");

    //  Set the POP3 login/password.
    CkMailMan_putPopUsername(mailman,"pop3_login");
    CkMailMan_putPopPassword(mailman,"pop3_password");

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

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

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

    if (bundle == 0 ) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        return;
    }

    for (i = 0; i <= CkEmailBundle_getMessageCount(bundle) - 1; i++) {
        email = CkEmailBundle_GetEmail(bundle,i);
        printf("%s\n",CkEmail_ck_from(email));
        printf("%s\n\n",CkEmail_subject(email));
        CkEmail_Dispose(email);
    }

    CkEmailBundle_Dispose(bundle);

    //  Close the connection (with both SSH server and POP3 server)
    CkMailMan_Pop3EndSession(mailman);

    CkMailMan_Dispose(mailman);

    }