(Unicode C++) TCP or TLS over Multiple Hop SSH to Remote Server

Demonstrates how to use the Chilkat Socket API to connect to a remote server (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => DestinationServer

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

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#include <CkSshW.h>
#include <CkSocketW.h>

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

    CkSshW ssh1;

    // Connect directly to the 1st SSH server.
    bool success = ssh1.Connect(L"serverssh1.com",22);
    if (success != true) {
        wprintf(L"%s\n",ssh1.lastErrorText());
        return;
    }

    // Authenticate using login/password:
    success = ssh1.AuthenticatePw(L"ssh1Login",L"ssh1Password");
    if (success != true) {
        wprintf(L"%s\n",ssh1.lastErrorText());
        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.
    CkSshW ssh2;
    success = ssh2.ConnectThroughSsh(ssh1,L"serverssh2.com",22);
    if (success != true) {
        wprintf(L"%s\n",ssh2.lastErrorText());
        return;
    }

    // Authenticate with ssh2...
    success = ssh2.AuthenticatePw(L"ssh2Login",L"ssh2Password");
    if (success != true) {
        wprintf(L"%s\n",ssh2.lastErrorText());
        return;
    }

    CkSocketW socket;

    // Tell the socket object to connect to our destination server though the ssh2 tunnel (which itself is routed through ssh1).
    // The connection looks like this:  ApplicationSocket(TLS) => ServerSSH1 => ServerSSH2 => DestinationServer
    success = socket.UseSsh(ssh2);
    if (success != true) {
        wprintf(L"%s\n",socket.lastErrorText());
        return;
    }

    // Connect using TLS to www.chilkatsoft.com
    // We could also tunnel a bare TCP connection by specifying port 80 with useTls = false.
    bool useTls = true;
    int maxWaitMillisec = 20000;
    success = socket.Connect(L"www.chilkatsoft.com",443,useTls,maxWaitMillisec);
    if (success != true) {
        wprintf(L"%s\n",socket.lastErrorText());
        return;
    }

    // Once the multiple hop SSH tunneled connection is setup,  the socket programming
    // is identical to the normal case where we have a direct connection.

    // Tell the socket object that all text is to be sent in the utf-8 encoding,
    // and the text received is assumed to be utf-8.
    socket.put_StringCharset(L"utf-8");

    // Send an HTTP HEAD request:
    success = socket.SendString(L"HEAD / HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n");
    if (success != true) {
        wprintf(L"%s\n",socket.lastErrorText());
        return;
    }

    // Wait a maximum of 4 seconds while no data is forthcoming:
    socket.put_MaxReadIdleMs(4000);

    // Get the 1st response line, which should be "HTTP/1.1 200 OK"
    const wchar_t *responseStatusLine = socket.receiveToCRLF();
    if (socket.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",socket.lastErrorText());
        return;
    }

    wprintf(L"StatusLine: %s\n",responseStatusLine);

    // Now get the 1st line of the response header:
    const wchar_t *responseHeaderLine = socket.receiveToCRLF();
    if (socket.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",socket.lastErrorText());
        return;
    }

    wprintf(L"HeaderLine: %s\n",responseHeaderLine);

    // Now read the remainder of the response header by reading until a double CRLF is seen:
    const wchar_t *remainderOfHeader = socket.receiveUntilMatch(L"\r\n\r\n");
    if (socket.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",socket.lastErrorText());
        return;
    }

    wprintf(L"Remainder: %s\n",remainderOfHeader);

    // Close the connection with the server.  This closes the tunnel through ssh2.
    // Wait a max of 20 seconds (20000 millsec)
    success = socket.Close(20000);

    // 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.
    ssh2.Disconnect();

    ssh1.Disconnect();
    }