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websockify was formerly named wsproxy and was part of the 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.
Notable commits, announcements and news are posted to @noVNC
If you are a websockify developer/integrator/user (or want to be) please join the noVNC/websockify discussion group
Bugs and feature requests can be submitted via github issues.
If you want to show appreciation for websockify you could donate to a great non-profits such as: Compassion International, SIL, Habitat for Humanity, Electronic Frontier Foundation, Against Malaria Foundation, Nothing But Nets, etc. Please tweet @noVNC if you do.
Starting with websockify 0.5.0, only the HyBi / IETF 6455 WebSocket protocol is supported. There is no support for the older Base64 encoded data format.
To encrypt the traffic using the WebSocket 'wss://' URI scheme you need to
generate a certificate and key for Websockify to load. By default, Websockify
loads a certificate file name self.pem but the --cert=CERT and --key=KEY
options 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
For a self-signed certificate to work, you need to make your client/browser understand it. You can do this by installing it as accepted certificate, or by using that same certificate for a HTTPS connection to which you navigate first and approve. Browsers generally don't give you the "trust certificate?" prompt by opening a WSS socket with invalid certificate, hence you need to have it accept it by either of those two methods.
The ports may be considered as distinguishing connections by the browser, for example, if your website url is https://my.local:8443 and your WebSocket url is wss://my.local:8001, first browse to https://my.local:8001, add the exception, then browse to https://my.local:8443 and add another exception. Then an html page served over :8443 will be able to open WSS to :8001
If you have a commercial/valid SSL certificate with one or more intermediate
certificates, concat them into one file, server certificate first, then the
intermediate(s) from the CA, etc. Point to this file with the --cert option
and then also to the key with --key. Finally, use --ssl-only as needed.
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).
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. This functionality
is activated 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.
Log files: websockify can save all logging information in a file.
This functionality is activated with the --log-file FILE option
where FILE is the file where the logs should be saved.
Authentication plugins: websockify can demand authentication for
websocket connections and, if you use --web-auth, also for normal
web requests. This functionality is activated with the
--auth-plugin CLASS and --auth-source ARG options, where CLASS is
usually one from auth_plugins.py and ARG is the plugin's configuration.
Token plugins: a single instance of websockify can connect clients to
multiple different pre-configured targets, depending on the token sent
by the client using the token URL parameter, or the hostname used to
reach websockify, if you use --host-token. This functionality is
activated with the --token-plugin CLASS and --token-source ARG
options, where CLASS is usually one from token_plugins.py and ARG is
the plugin's configuration.
The primary implementation of websockify is in python. There are several alternate implementations in other languages available in our sister repositories websockify-js (JavaScript/Node.js) and websockify-other (C, Clojure, Ruby).
In addition there are several other external projects that implement the websockify "protocol". See the alternate implementation Feature Matrix for more information.
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.
This is accomplished by the 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.
`./run 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:
`./run 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 ./run 2023 --wrap-mode=respawn -- telnetd -debug 2023`
The wstelnet.html page in the websockify-js
project demonstrates a simple WebSockets based telnet client (use
'localhost' and '2023' for the host and port respectively).
Download one of the releases or the latest development version, extract
it and run python3 setup.py install as root in the directory where you
extracted the files. Normally, this will also install numpy for better
performance, if you don't have it installed already. However, numpy is
optional. If you don't want to install numpy or if you can't compile it,
you can edit setup.py and remove the install_requires=['numpy'], line
before running python3 setup.py install.
Afterwards, websockify should be available in your path. Run
websockify --help to confirm it's installed correctly.
You can also run websockify using Docker, Podman, Singularity, udocker or your favourite container runtime that support OCI container images.
The entrypoint of the image is the run command.
To build the image:
./docker/build.sh
Once built you can just launch it with the same
arguments you would give to the run command and taking care of
assigning the port mappings:
docker run -it --rm -p <port>:<container_port> novnc/websockify <container_port> <run_arguments>
For example to forward traffic from local port 7000 to 10.1.1.1:5902 you can use:
docker run -it --rm -p 7000:80 novnc/websockify 80 10.1.1.1:5902
If you need to include files, like for example for the --web or --cert
options you can just mount the required files in the /data volume and then
you can reference them in the usual way:
docker run -it --rm -p 443:443 -v websockify-data:/data novnc/websockify --cert /data/self.pem --web /data/noVNC :443 --token-plugin TokenRedis --token-source myredis.local:6379 --ssl-only --ssl-version tlsv1_2
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