C#

IMAP SSH Tunneling (Port Forwarding)

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

bool success = false;

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

Chilkat.Imap imap = new Chilkat.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).
string sshHostname = "www.mysshserver.com";
int sshPort = 22;

//  Connect to an SSH server and establish the SSH tunnel:
success = imap.SshOpenTunnel(sshHostname,sshPort);
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    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 == false) {
    Debug.WriteLine(imap.LastErrorText);
    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.Ssl = true;
imap.Port = 993;
success = imap.Connect("imap.my-imap-server.com");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Authenticate with the IMAP server via the SSH tunnel.
success = imap.Login("myLogin","myPassword");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Select an IMAP mailbox
success = imap.SelectMailbox("Inbox");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  How many messages in Inbox?
int msgCount = imap.NumMessages;
if (msgCount == 0) {
    Debug.WriteLine("No messages found.");
    return;
}

int upperBound = 10;
if (msgCount < upperBound) {
    upperBound = msgCount;
}

//  Download up to the 1st 10 messages.
Chilkat.Email email = new Chilkat.Email();
int i;
bool bUid = false;
for (i = 1; i <= upperBound; i++) {

    success = imap.FetchEmail(false,i,bUid,email);
    if (success == false) {
        Debug.WriteLine(imap.LastErrorText);
        return;
    }

    Debug.WriteLine(email.From);
    Debug.WriteLine(email.Subject);
    Debug.WriteLine("----");
}

//  Disconnect from the IMAP server.
//  The SSH tunnel remains open.
success = imap.Disconnect();
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    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 == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Review the LastErrorText to see that the connection was made via the SSH tunnel:
Debug.WriteLine(imap.LastErrorText);

success = imap.Disconnect();
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Finally, close the SSH tunnel.
success = imap.SshCloseTunnel();
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

Debug.WriteLine("IMAP SSH tunneling example completed.");