SSH Tunnel (Port Forwarding via direct-tcpip channel)

Demonstrates how to create an SSH tunnel to a remote hostname:port via a direct-tcpip channel.

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

// Needs #include <CkSsh.h>

    CkString strOut;

    //  Important: It is helpful to send the contents of the
    //  ssh.LastErrorText property when requesting support.

    CkSsh ssh;

    //  Any string automatically begins a fully-functional 30-day trial.
    bool success;
    success = ssh.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Connect to an SSH server:
    const char * hostname;
    long port;

    //  Hostname may be an IP address or hostname:
    hostname = "192.168.1.117";
    port = 22;

    success = ssh.Connect(hostname,port);
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Wait a max of 5 seconds when reading responses..
    ssh.put_IdleTimeoutMs(5000);

    //  Authenticate using login/password:
    success = ssh.AuthenticatePw("chilkat","myPassword");
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Open a direct-tcpip channel.  We want the SSH server to connect
    //  to www.chilkatsoft.com, port 80 (i.e. the web server).
    //  Data sent through the SSH tunnel is forwarded to the remote
    //  host:port.  (Note: The remote host:port does not need to be
    //  a web server.  It can be anything.  It can be your own
    //  customer application server that listens on a port, or any
    //  other type of server.)
    //  When we read from the SSH channel, we'll be reading data
    //  sent from the remote host:port (i.e. the web server in this
    //  example).
    long channelNum;
    channelNum = ssh.OpenDirectTcpIpChannel("www.chilkatsoft.com",80);
    if (channelNum < 0) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
    const char * httpReq;
    httpReq = "GET /xyz123.html HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n";

    //  Send the HTTP request:
    success = ssh.ChannelSendString(channelNum,httpReq,"ansi");
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Get the HTTP response.
    //  First read the HTTP response header which ends with a double CRLF.
    //  Calling ChannelReceiveUntilMatch will receive until match string is seen,
    //  or until a timeout occurs (IdleTimeoutMs property).  ChannelReceiveUntilMatch
    //  may read beyond the match string, but it will stop reading as soon as the match
    //  string is seen.
    bool caseSensitive;
    caseSensitive = false;
    const char * matchStr;
    matchStr = "\r\n\r\n";
    success = ssh.ChannelReceiveUntilMatch(channelNum,matchStr,"ansi",caseSensitive);
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Extract the HTTP header from the receive buffer.
    //  (GetReceiveTextS extracts up to and including the match string from the receive buffer)
    const char * responseHeader;
    responseHeader = ssh.getReceivedTextS(channelNum,matchStr,"ansi");
    strOut.append("---- HTTP Response Header ----");
    strOut.append("\r\n");
    strOut.append(responseHeader);
    strOut.append("\r\n");

    //  Now get the body of the HTTP response (this is the HTML content
    //  of http://www.chilkatsoft.com/xyz.html
    //  It's possible we've already received the entire HTTP response in the
    //  call to ChannelReceiveUntilMatch.  Therefore, we'll poll for any remaining data
    //  and wait a max of .2 seconds.
    long numBytesRead;
    long pollTimeoutMs;
    pollTimeoutMs = 200;
    numBytesRead = ssh.ChannelPoll(channelNum,pollTimeoutMs);
    //  We're not checking for an error here.
    //  A return value of -2 means that no data was available and the poll simply timed out (not an error)
    //  A return value of -1 indicates an error.
    //  A return value greater than 0 indicates that additional data was received.

    strOut.append("---- HTML BODY ----");
    strOut.append("\r\n");

    //  Extract the remainder of the accumulated data in the internal receive buffer.
    //  This should be our HTML body:
    const char * htmlBody;
    htmlBody = ssh.getReceivedText(channelNum,"ansi");
    strOut.append(htmlBody);
    strOut.append("\r\n");

    //  Close the channel:
    success = ssh.ChannelSendClose(channelNum);
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Disconnect
    ssh.Disconnect();

    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());