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netcat-diode.md

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Working with UDPCast to transfer files made me wonder is there is another application to create a one way tunnel that has the Forward Error Control (FEC) functionality combined with rate limiting. If there is no such application this could be an idea for a hackathon or a development team.

In my opinion the software should contain a sender and receiver that is able to receive data from a variation of applications. The goal is to create a permanent unidirectional tunnel between 2 (or more) computers. Using this tool it should be able to send the information via a data-diode. Another use-case is limiting network bandwidth by only sending the data of using a unidirectional radio link.

Sender

  • should run constantly waiting for input from an application like a NETCAT tunnel 1
  • should use UDP
  • should support Linux
  • should be able to configure the transfer speed
  • should send a keep alive every X receiver
  • should add a sequence number to each packet
  • could log a manifest on the senders machine
  • could send the manifest every X to the receiver
  • should be able to send to an IP, broadcast address or multicast destination on a specific interface
  • should be able to add Forward Error Control (FEC) like UDPcast 2
  • could be able to cache packets with a configurable disklocation and size
  • could be able to add encryption using a defined password of public/private key
  • should send every message/file/object as a separate session (to prevent the tunnel to terminate when one session fails)
  • should be able to run as an application or a service
  • could be able to run a speed optimization to determine optimal speed and settings
  • could prevent packet loss as described in ref 3
  • should contain a debug mode

Receiver

  • should run constantly waiting for input from a sender like a NETCAT tunnel 1
  • should listen for a keep alive every X from the sender
  • should monitor the packet sequence number and report on missing packets and report on missing packets
  • could be able to receive a manifest and report on missing items
  • could be able to log and report on missing sequencenumbers
  • could be able to add encryption using a defined password of public/private key
  • should be able to run as an application or a service
  • could be able to run a speed optimization to determine optimal speed and settings and advice optimal settings
  • could prevent packet loss as described in ref 3
  • should contain a debug mode

Footnotes

  1. https://www.devkb.org/linux/115-TCP-tunnel-port-forwarding-using-Netcat ↩ ↩2

  2. https://github.com/elisescu/udpcast/blob/master/fec.c ↩

  3. https://github.com/Vrolijk/OSDD/blob/main/packetloss_explained.md ↩ ↩2