(C) IMAP over Multiple Hop SSH

Demonstrates how to read IMAP email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => IMAPServer

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

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#include <C_CkSsh.h>
#include <C_CkImap.h>

void ChilkatSample(void)
    {
    HCkSsh ssh1;
    BOOL success;
    HCkSsh ssh2;
    HCkImap imap;

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

    ssh1 = CkSsh_Create();

    // Connect directly to the 1st SSH server.
    success = CkSsh_Connect(ssh1,"serverssh1.com",22);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh1));
        CkSsh_Dispose(ssh1);
        return;
    }

    // Authenticate using login/password:
    success = CkSsh_AuthenticatePw(ssh1,"ssh1Login","ssh1Password");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh1));
        CkSsh_Dispose(ssh1);
        return;
    }

    // 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.
    ssh2 = CkSsh_Create();
    success = CkSsh_ConnectThroughSsh(ssh2,ssh1,"serverssh2.com",22);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh2));
        CkSsh_Dispose(ssh1);
        CkSsh_Dispose(ssh2);
        return;
    }

    // Authenticate with ssh2...
    success = CkSsh_AuthenticatePw(ssh2,"ssh2Login","ssh2Password");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh2));
        CkSsh_Dispose(ssh1);
        CkSsh_Dispose(ssh2);
        return;
    }

    imap = CkImap_Create();

    // Tell the IMAP object to connect to the IMAP server though the ssh2 tunnel (which itself is routed through ssh1).
    // The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => IMAPServer
    success = CkImap_UseSsh(imap,ssh2);
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkSsh_Dispose(ssh1);
        CkSsh_Dispose(ssh2);
        CkImap_Dispose(imap);
        return;
    }

    CkImap_putSsl(imap,TRUE);
    CkImap_putPort(imap,993);

    // Connect to an IMAP server (through the multi-hop SSH tunnel)
    success = CkImap_Connect(imap,"imap.someimapserver.com");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkSsh_Dispose(ssh1);
        CkSsh_Dispose(ssh2);
        CkImap_Dispose(imap);
        return;
    }

    // Login
    success = CkImap_Login(imap,"myLogin","myPassword");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkSsh_Dispose(ssh1);
        CkSsh_Dispose(ssh2);
        CkImap_Dispose(imap);
        return;
    }

    // Do whatever needs to be done...  for example,

    // Create the new email folder (sub-mailbox) on the IMAP server.
    // If no folder path is provided, the new folder is a sub-mailbox of Inbox.
    success = CkImap_CreateMailbox(imap,"newFolder");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkSsh_Dispose(ssh1);
        CkSsh_Dispose(ssh2);
        CkImap_Dispose(imap);
        return;
    }

    printf("Success.\n");

    // Close the connection with the IMAP server.  (This closes the tunnel through ssh2)
    // The connection with ssh2 is still alive, and may be used for more connections.
    success = CkImap_Disconnect(imap);

    // 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.
    CkSsh_Disconnect(ssh2);

    CkSsh_Disconnect(ssh1);


    CkSsh_Dispose(ssh1);
    CkSsh_Dispose(ssh2);
    CkImap_Dispose(imap);

    }