Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

C# UWP/WinRT Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Azure Cloud Storage
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(C# UWP/WinRT) WebSocket through SSH Tunnel

This example shows how to establish a WebSocket connection through an SSH tunnel. The WebSocket protocol communications will be encapsulated within an SSH tunnel.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

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

//  --------------------------------------------------
//  This example borrows the code from the REST through SSH Tunnel example.
//  We first use the Chilkat Socket object to establish a connection to the WebSocket server through an SSH Tunnel.
//  Next, the Rest object uses the Socket object for its connection.
//  Finally, the WebSocket object uses the Rest object for its connection.
// 
//  Hopefully the flexibility of this architecture is easy to see.  All of the HTTP functionality of the Rest object,
//  such as HTTP authentication, custom headers, etc. is available to the WebSocket.  Likewise, all of the advanced functionality
//  of the Socket object is in turn available to the Rest object.

//  The high-level steps for accomplishing the task of running the WebSocket protocol through an SSH accomplished as follows:
//  1) Create the SSH tunnel using Chilkat Socket.
//  2) Open a port-forwarding channel (to the WebSocket server) within the tunnel.
//  2) Tell Rest to use the Socket object.
//  3) Tell WebSocket to use the Rest object.

Chilkat.Socket tunnel = new Chilkat.Socket();

string sshHostname = "www.my-ssh-server.com";
int sshPort = 22;

//  Connect to an SSH server and establish the SSH tunnel:
bool success = await tunnel.SshOpenTunnelAsync(sshHostname,sshPort);
if (success != true) {
    Debug.WriteLine(tunnel.LastErrorText);
    return;
}

//  Authenticate with the SSH server via a login/password
//  or with a public key.
//  This example demonstrates SSH password authentication.
success = await tunnel.SshAuthenticatePwAsync("mySshLogin","mySshPassword");
if (success != true) {
    Debug.WriteLine(tunnel.LastErrorText);
    return;
}

//   OK, the SSH tunnel is setup.  Now open a channel within the tunnel.
Chilkat.Socket channel = null;

bool bTls = true;
int port = 443;
int maxWaitMs = 5000;

//  This returns a socket object that is a single channel within the SSH tunnel.
//  The SSH channel is our logical port-forwarded connection through the SSH tunnel.
//  Note: This example establishes a TLS connection to the target WebSocket server.
//  (The TLS protocol will run on the logical channel within the SSH tunnel.)
//  Your application can just as easily make a non-TLS connection by changing the arguments
//  passed to SshOpenChannel.
channel = await tunnel.SshOpenChannelAsync("some-websocket-server.com",port,bTls,maxWaitMs);
if (tunnel.LastMethodSuccess != true) {
    Debug.WriteLine(tunnel.LastErrorText);
    return;
}

//  Create a REST object and tell it to use the SSH channel.
//  This connection is a TLS running on an SSH channel through an SSH tunnel.
//  In other words, TLS is wrapped within the SSH tunnel.
Chilkat.Rest rest = new Chilkat.Rest();
success = rest.UseConnection(channel,false);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);

    return;
}

//  Finally, tell our WebSocket object to use the Rest object..
Chilkat.WebSocket ws = new Chilkat.WebSocket();

//  Tell the WebSocket to use this connection.
success = ws.UseConnection(rest);
if (success != true) {
    Debug.WriteLine(ws.LastErrorText);
    return;
}

//  Add the standard WebSocket open handshake headers that will be needed.
//  (This adds the required HTTP request headers to the rest object.)
ws.AddClientHeaders();

//  Add any additional headers that might be desired.
//  Two common WebSocketSpecific headers are "Sec-WebSocket-Protocol" and "Origin".
rest.AddHeader("Sec-WebSocket-Protocol","x-some-websocket-subprotocol");
rest.AddHeader("Origin","http://some-websocket-server.com");

//  Do the open handshake.
string responseBody = await rest.FullRequestNoBodyAsync("GET","/something");
if (rest.LastMethodSuccess != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

//  If successful, the HTTP response status code should be 101,
//  and the response body will be empty. (If it failed, we'll have a look
//  at the response body..)
int statusCode = rest.ResponseStatusCode;
Debug.WriteLine("Response status code: " + Convert.ToString(statusCode));

if (statusCode != 101) {
    Debug.WriteLine(responseBody);
    Debug.WriteLine("-- Failed because of unexpected response status code.");
    return;
}

//  We have the expected 101 response, so let's now validate the
//  contents of the response, such as the value sent by the server in the
//  Sec-WebSocket-Accept header.
success = ws.ValidateServerHandshake();
if (success != true) {
    Debug.WriteLine(ws.LastErrorText);
    return;
}

Debug.WriteLine("WebSocket connection successful.");

//  The application may now begin sending and receiving frames on the WebSocket connection.
//  (At this point, we're done with the rest object...)

 

© 2000-2022 Chilkat Software, Inc. All Rights Reserved.