Metadata-Version: 1.0
Name: websockify
Version: 0.4.1
Summary: Websockify.
Home-page: https://github.com/kanaka/websockify
Author: Joel Martin
Author-email: github@martintribe.org
License: LGPLv3
Description: ## websockify: WebSockets support for any application/server
        
        websockify was formerly named wsproxy and was part of the
        [noVNC](https://github.com/kanaka/noVNC) project.
        
        At the most basic level, websockify just translates WebSockets traffic
        to normal socket traffic. Websockify accepts the WebSockets handshake,
        parses it, and then begins forwarding traffic between the client and
        the target in both directions.
        
        ### WebSockets binary data
        
        Websockify 0.4.X supports all versions of the WebSockets protocol
        (Hixie and HyBi). Starting with websockify 0.5.0, only the HyBi / IETF
        6455 WebSocket protocol is supported.
        
        The older Hixie versions of the protocol only support UTF-8 text
        payloads. In order to transport binary data over UTF-8 an encoding
        must used to encapsulate the data within UTF-8. With Hixie clients,
        Websockify uses base64 to encode all traffic to and from the client.
        This does not affect the data between websockify and the server.
        
        With HyBi clients, websockify negotiates whether to base64 encode
        traffic to and from the client via the subprotocol header
        (Sec-WebSocket-Protocol). The valid subprotocol values are 'binary'
        and 'base64' and if the client sends both then the server (the python
        implementation) will prefer 'binary'. The 'binary' subprotocol
        indicates that the data will be sent raw using binary WebSocket
        frames. Some HyBi clients (such as the Flash fallback and older Chrome
        and iOS versions) do not support binary data which is why the
        negotiation is necessary.
        
        
        ### Encrypted WebSocket connections (wss://)
        
        To encrypt the traffic using the WebSocket 'wss://' URI scheme you
        need to generate a certificate for websockify to load. By default websockify
        loads a certificate file name `self.pem` but the `--cert=CERT` option can
        override the file name. You can generate a self-signed certificate using
        openssl. When asked for the common name, use the hostname of the server where
        the proxy will be running:
        
        ```
        openssl req -new -x509 -days 365 -nodes -out self.pem -keyout self.pem
        ```
        
        
        ### Websock Javascript library
        
        
        The `include/websock.js` Javascript library library provides a Websock
        object that is similar to the standard WebSocket object but Websock
        enables communication with raw TCP sockets (i.e. the binary stream)
        via websockify. This is accomplished by base64 encoding the data
        stream between Websock and websockify.
        
        Websock has built-in receive queue buffering; the message event
        does not contain actual data but is simply a notification that
        there is new data available. Several rQ* methods are available to
        read binary data off of the receive queue.
        
        The Websock API is documented on the [websock.js API wiki page](https://github.com/kanaka/websockify/wiki/websock.js)
        
        See the "Wrap a Program" section below for an example of using Websock
        and websockify as a browser telnet client (`wstelnet.html`).
        
        
        ### Additional websockify features
        
        These are not necessary for the basic operation.
        
        * Daemonizing: When the `-D` option is specified, websockify runs
          in the background as a daemon process.
        
        * SSL (the wss:// WebSockets URI): This is detected automatically by
          websockify by sniffing the first byte sent from the client and then
          wrapping the socket if the data starts with '\x16' or '\x80'
          (indicating SSL).
        
        * Flash security policy: websockify detects flash security policy
          requests (again by sniffing the first packet) and answers with an
          appropriate flash security policy response (and then closes the
          port). This means no separate flash security policy server is needed
          for supporting the flash WebSockets fallback emulator.
        
        * Session recording: This feature that allows recording of the traffic
          sent and received from the client to a file using the `--record`
          option.
        
        * Mini-webserver: websockify can detect and respond to normal web
          requests on the same port as the WebSockets proxy and Flash security
          policy. This functionality is activate with the `--web DIR` option
          where DIR is the root of the web directory to serve.
        
        * Wrap a program: see the "Wrap a Program" section below.
        
        
        ### Implementations of websockify
        
        The primary implementation of websockify is in python. There are
        several alternate implementations in other languages (C, Node.js,
        Clojure, Ruby) in the `other/` subdirectory (with varying levels of
        functionality).
        
        In addition there are several other external projects that implement
        the websockify "protocol". See the alternate implementation [Feature
        Matrix](https://github.com/kanaka/websockify/wiki/Feature_Matrix) for
        more information.
        
        
        ### Wrap a Program
        
        In addition to proxying from a source address to a target address
        (which may be on a different system), websockify has the ability to
        launch a program on the local system and proxy WebSockets traffic to
        a normal TCP port owned/bound by the program.
        
        The is accomplished with a small LD_PRELOAD library (`rebind.so`)
        which intercepts bind() system calls by the program. The specified
        port is moved to a new localhost/loopback free high port. websockify
        then proxies WebSockets traffic directed to the original port to the
        new (moved) port of the program.
        
        The program wrap mode is invoked by replacing the target with `--`
        followed by the program command line to wrap.
        
            `./websockify 2023 -- PROGRAM ARGS`
        
        The `--wrap-mode` option can be used to indicate what action to take
        when the wrapped program exits or daemonizes.
        
        Here is an example of using websockify to wrap the vncserver command
        (which backgrounds itself) for use with
        [noVNC](https://github.com/kanaka/noVNC):
        
            `./websockify 5901 --wrap-mode=ignore -- vncserver -geometry 1024x768 :1`
        
        Here is an example of wrapping telnetd (from krb5-telnetd).telnetd
        exits after the connection closes so the wrap mode is set to respawn
        the command:
        
            `sudo ./websockify 2023 --wrap-mode=respawn -- telnetd -debug 2023`
        
        The `wstelnet.html` page demonstrates a simple WebSockets based telnet
        client.
        
        
        ### Building the Python ssl module (for python 2.5 and older)
        
        * Install the build dependencies. On Ubuntu use this command:
        
            `sudo aptitude install python-dev bluetooth-dev`
        
        * Download, build the ssl module and symlink to it:
        
            `cd websockify/`
        
            `wget http://pypi.python.org/packages/source/s/ssl/ssl-1.15.tar.gz`
        
            `tar xvzf ssl-1.15.tar.gz`
        
            `cd ssl-1.15`
        
            `make`
        
            `cd ../`
        
            `ln -sf ssl-1.15/build/lib.linux-*/ssl ssl`
        
        
        Changes
        =======
        
        0.4.1 - Mar 12, 2013
        --------------------
        
         * ***NOTE*** : 0.5.0 will drop Hixie protocol support
         * add include/ directory and remove some dev files from source
           distribution.
        
        0.4.0 - Mar 12, 2013
        --------------------
        
         * ***NOTE*** : 0.5.0 will drop Hixie protocol support
         * use Buffer base64 support in Node.js implementation
        
        0.3.0 - Jan 15, 2013
        --------------------
        
         * refactor into modules: websocket, websocketproxy
         * switch to web-socket-js that uses IETF 6455
         * change to MPL 2.0 license for include/*.js
         * fix session recording
        
        0.2.1 - Oct 15, 2012
        --------------------
        
         * re-released with updated version number
        
        0.2.0 - Sep 17, 2012
        --------------------
        
         * Binary data support in websock.js
         * Target config file/dir and multiple targets with token selector
         * IPv6 fixes
         * SSL target support
         * Proxy to/from unix socket
        
        
        0.1.0 - May 11, 2012
        --------------------
        
         * Initial versioned release.
        
        
        
Keywords: noVNC websockify
Platform: UNKNOWN
Classifier: Programming Language :: Python
