eliastor / packetconn

Creates "virtual" net.Conn connections with remote hosts for packets come from/to net.PacketConn to such hosts

packetconn

Creates "virtual" net.Conn connections with remote hosts for packets come from/to net.PacketConn to such hosts

Details

If you've ever heard about Linux conntrack tldr this library is like conntrack but works with any net.PacketConn (unixgram and udp).

net.PacketConn connection is packet only connection without any real connection promoted by go stdlib and can be used with udp or unixgram.

Every connection have 2 sides: let's assume them local and remote hosts. PacketConn pass packets from different remote hosts to single local one. Packetconn spreads different remote hosts to multiple "virtual" connection (the implements net.Conn BTW) you can handle with as you always do using Accept method. Note that if you want to connect another node and answer need to be received by your tracked connection you should use Dial method

Example

var defaultMulticast = net.UDPAddr{
	IP:   net.IPv4(224, 1, 1, 1),
	Port: 1111,
}

//Create anything implements net.PacketConn
l, _ := net.ListenMulticastUDP("udp", nil, &h.listen)

//Track connections on it
tTracker, _ := packetconn.Track(l)

//You can dial to remote hosts
connOut, _err := tTracker.Dial("udp", "192.168.1.111")

//Or receive incoming connection
for {
    conn, err := tTracker.Accept()
    //work with conn as you always do with net.Conn
}