Stream Control Transmission Protocol (SCTP) for Node.js

This is a userspace (not kernel), pure Javascript implementation of SCTP protocol (RFC4960). It depends on raw-socket module as IP network layer. Raw-socket requires compilation, but builds on most popular platforms (Linux, Windows, MacOS). This makes SCTP module multi-platform, as Node.js itself.

Module implements sockets interface (RFC6458) in Node.js Net API.

Warning! Warning! Warning!

Implementation of RFC4960 is currently incomplete and unstable, don't use in production environment!

Disable LK-SCTP

On Linux LK-SCTP should be disabled, because it conflicts with any other implementation. To prevent the "sctp" kernel module from being loaded, add the following line to a file in the directory "/etc/modprobe.d": install sctp /bin/true

Raw socket

Prerequisites for building raw-socket module

Windows:

npm install --global --production windows-build-tools
npm install --global node-gyp

CentOS:

yum install centos-release-scl-rh
yum install devtoolset-3-gcc devtoolset-3-gcc-c++
scl enable devtoolset-3 bash

MacOS: install Xcode, accept license

Need root priveledges

Quotation from raw-socket README:

Some operating system versions may restrict the use of raw sockets to privileged users. If this is the case an exception will be thrown on socket creation using a message similar to Operation not permitted (this message is likely to be different depending on operating system version).

Module status

Module has alpha status. Please do not send patches and pull requests yet, better ask for bug fixes and feature implementation.

Not implemented yet:

multi-homing
IPv6
congestion control (incomplete)
counters
etc

Nevertheless, module successfully passes most of sctp_test cases (both client and server)

Documentation

Refer to Net API

sctp.protocol

sctp.protocol is a dictionary object with SCTP Payload Protocol Identifiers

For example, sctp.protocol.M3UA = 3

var sctp = require('sctp')
console.log(Object.keys(sctp.protocol).join())
//output: SCTP,IUA,M2UA,M3UA,SUA,M2PA,V5UA,H248,SSH,Diameter,Diameter_DTLS,WebRTC_DCEP,WebRTC_String,WebRTC_Binary,WebRTC_String_Empty,WebRTC_Binary_Empty

Quick example

var sctp = require('sctp')
var server = sctp.createServer()
server.on('connection', function (socket) {
    console.log('remote socket connected from', socket.remoteAddress, socket.remotePort)
    socket.on('data', function (data) {
        console.log('server socket received data', data);
        socket.write(Buffer.from('010003040000001000110008000003ea', 'hex'))
    });
})
server.listen({
    port: 2905
})

var socket = sctp.connect({
    protocol: sctp.protocol.M3UA,
    host: '127.0.0.1',
    port: 2905
}, function () {
    console.log('socket connected')
    socket.write(Buffer.from('010003010000001000110008000003ea', 'hex'))
})

socket.on('data', function (buffer) {
    console.log('data', buffer)
    socket.end()
    server.close()
    process.exit()
})

Credits

Inspiration and some ideas are taken from smpp module

waqassiddiqi/node-sctp