communityid
v2.1.0
Published
An implementation of the open Community ID flow tuple hashing standard
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communityid-js
This package provides a JavaScript implementation of the open Community ID flow tuple hashing standard.
It targets Node 18 and newer and has no additional dependencies.
Installation
This package is available via NPM, therefore:
$ npm install -g communityid
To install locally from a git clone, you can also use npm, e.g. by saying
$ npm install /path/to/the/clone
The package works with local or global installation. It ships with an executable to provide command-line Community ID calculation (see below), for which global installation is recommended.
Usage
The API is very simple:
const communityid = require('communityid');
console.log(communityid.calc('tcp', '127.0.0.1', '10.0.0.1', 1234, 80));
This will print "1:mgRgpIZSu0KHDp/QrtcWZpkJpMU=". For details on the arguments
and their types, please see the calc
function's docstring. Seeding is
supported, and base64 encoding can optionally be disabled. In case of problems
with the input arguments, the function returns null
and reports an error
message through the package's communityid.error()
function, which defaults to
console.error()
.
The package includes a sample application,
community-id,
which calculates the ID for given flow tuples. See its --help
output
for details. An example:
$ community-id tcp 10.0.0.1 10.0.0.2 10 20
1:9j2Dzwrw7T9E+IZi4b4IVT66HBI=
For troubleshooting, the communityid.calc()
implementation can report the
hashed data to stderr. To enable, set (or add) the communityid
debug stream in
your NODE_DEBUG
environment variable:
$ NODE_DEBUG=communityid community-id tcp 10.0.0.1 10.0.0.2 10 20
COMMUNITYID 1182249: seed 00:00
COMMUNITYID 1182249: saddr 0a:00:00:01
COMMUNITYID 1182249: daddr 0a:00:00:02
COMMUNITYID 1182249: proto 06
COMMUNITYID 1182249: padding 00
COMMUNITYID 1182249: sport 00:0a
COMMUNITYID 1182249: dport 00:14
1:9j2Dzwrw7T9E+IZi4b4IVT66HBI=
Testing
The package includes a testsuite in the test
folder, via Node's test
runner. To execute, run the following from the toplevel or the test
folder:
$ node --test
✔ icmp 1 (3.838516ms)
✔ icmp 2 (0.338138ms)
✔ icmp 3 (0.446812ms)
...
Browser support
The package currently does not support browser-side operation. Contributions very welcome!