在NEPacketTunnelProvider中获取UDP数据包详细信息

Question

I want to get the details like IP address of source & destination along with the port numbers from the UDP packet we received in

 self.packetFlow.readPackets { [weak self] (packets: [Data], protocols: [NSNumber]) in
        }

I am using following code to for creating session so assuming that the packet will be UDP

self.session = self.createUDPSession(to: NWHostEndpoint(hostname: serverAddress, port: serverPort), from: nil)

where self.sssion is var session: NWUDPSession?

Do someone has any pointers how to do this in swift ?

I am looking for some code as I am relatively new to packet level things.

Answer 1

I was able to read the source and destination address, along with ports of the packet using IPPacket class in NEKIT iOS Code. Hope this will help someone who face this kind of scenerio.

Answer 2

I would use a solution such as BinUtils to unpack the array of Data packets received from the packetFlow.readPackets() method. These are IP packets received from your applications. You will need to define the the format for an the IP Header and UDP Header yourself.