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.

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

Chilkat.Ssh ssh = new Chilkat.Ssh();

//  Any string automatically begins a fully-functional 30-day trial.
bool success;
success = ssh.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    MessageBox.Show(ssh.LastErrorText);
    return;
}

//  Connect to an SSH server:
string hostname;
int port;

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

success = ssh.Connect(hostname,port);
if (success != true) {
    MessageBox.Show(ssh.LastErrorText);
    return;
}

//  Wait a max of 5 seconds when reading responses..
ssh.IdleTimeoutMs = 5000;

//  Authenticate using login/password:
success = ssh.AuthenticatePw("chilkat","myPassword");
if (success != true) {
    MessageBox.Show(ssh.LastErrorText);
    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).
int channelNum;
channelNum = ssh.OpenDirectTcpIpChannel("www.chilkatsoft.com",80);
if (channelNum < 0) {
    MessageBox.Show(ssh.LastErrorText);
    return;
}

//  Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
string 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) {
    MessageBox.Show(ssh.LastErrorText);
    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;
string matchStr;
matchStr = "\r\n\r\n";
success = ssh.ChannelReceiveUntilMatch(channelNum,matchStr,"ansi",caseSensitive);
if (success != true) {
    MessageBox.Show(ssh.LastErrorText);
    return;
}

//  Extract the HTTP header from the receive buffer.
//  (GetReceiveTextS extracts up to and including the match string from the receive buffer)
string responseHeader;
responseHeader = ssh.GetReceivedTextS(channelNum,matchStr,"ansi");
textBox1.Text += "---- HTTP Response Header ----" + "\r\n";
textBox1.Text += responseHeader + "\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.
int numBytesRead;
int 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.

textBox1.Text += "---- HTML BODY ----" + "\r\n";

//  Extract the remainder of the accumulated data in the internal receive buffer.
//  This should be our HTML body:
string htmlBody;
htmlBody = ssh.GetReceivedText(channelNum,"ansi");
textBox1.Text += htmlBody + "\r\n";

//  Close the channel:
success = ssh.ChannelSendClose(channelNum);
if (success != true) {
    MessageBox.Show(ssh.LastErrorText);
    return;
}

//  Disconnect
ssh.Disconnect();