iso-on-tcp

This is a (still) partial implementation of the ISO-on-TCP protocol (RFC1006). It implements a parser and a serializer as Transform Streams that can be used individually, and a client implementation as a Duplex stream.

The code currently lacks the implementation of parts of the protocol, as it's currently focused on the parts needed for the nodeS7 project. But as long as it follows the protocol, pull requests will be happily accepted. Please check the CODE_OF_CONDUCT.md.

This library was created as part of the ST-One project.

Usage

The easiest way to create a connection is to use the createConnection() method

let client = isoontcp.createConnection({
    port: 102
    host: '192.168.0.100',
    srcTSAP: 0x0100,
    dstTSAP: 0x0100
});

It will create a bidirectional stream that will be sent and received as DATA (DT) telegrams. From there on you can use it as any other Node.JS duplex stream, that is, you can call methods like client.on('data'), client.write(buffer), and event client.pipe(anotherStream).

If you want to access the individual messages received, you can listen to the raw-message event, or even message for every complete DT telegram.

Documentation

Please check the JSDoc Documentation

References

• Personal Notes
• https://tools.ietf.org/html/rfc1006
• https://tools.ietf.org/html/rfc905
• https://wiki.wireshark.org/S7comm
• https://github.com/boundary/wireshark/blob/master/epan/dissectors/packet-ositp.c
• https://github.com/szpajder/dumpvdl2/blob/master/cotp.c
• https://github.com/mushorg/conpot/blob/master/conpot/protocols/s7comm/cotp.py

Glossary

These are some abbreviations commonly found in the references that may be useful to know beforehand

• TSAP - Transport Service Access Point
• TPDU - Transport Protocol Data Units
• TSDU - Transport Service Data Units
• SPDU - Session Protocol Data Unit
• TPKT - TPDU packet
• COTP - Connection-Oriented Transport Protocol

License

Copyright: (c) 2018-2020, ST-One, Guilherme Francescon Cittolin [email protected]

GNU General Public License v3.0+ (see LICENSE or https://www.gnu.org/licenses/gpl-3.0.txt)