Proof of concept utility to rebroadcast FlexRadio Discovery Packets to OPNSense VPN users
This tool is deisgned to run on a linux machine on the same subnet as a FlexRadio Signature Radio and retransmit the VITA 49 discovery packets to a group of VPN users connected to a OPNSense firewall.
This tool requires libpcap-dev or the correct equivalent for your operating system to be installed.
To build for your OS & architecture, run:
go mod tidy
go build
Create a .flextool file with the appropriate configuration for your use case.
VPN user routes can be synchronized from an OPNSENSE firewall/router using the administrative api. When each vpn connection has a common name, this tool syncs the common name and client ip address to a SQLite database for later use. A -d flag is used to purge the database of user records prior to inserting the latest list of VPN client ips.
The user sync can be manually executed with:
flextool sync -d
The tool can listen on a local network interface for FlexRadio discovery broadcast packets and retransmit them to all VPN ip addresses listed in the SQLite database:
flextool listen
For troubleshooting and testing, the tool also supports displaying information about the local network interfaces and can read a PCAP file and retransmit those VITA 49 packets.
flextool info -l
flextool info -g eth0
flextool pcap