IPv4/UDP headers + simple CHAP auth

Features implemented

Network communication with raw sockets
IPV4 (de)serialization
UDP (de)serialization
Ring buffers (only at level 3)
Simple CHAP authentication

Run

nc -u -lp 14242

tcpdump udp -i lo -vvvv -s 0 -U -n

make && sudo ./chap

Run server:

tar xvf mycharp_server.tgz
cd server/
make
./server 14242

Missing

validate received checksum
ring buffer for received cmd interpreter (not only for raw packet reads)
dynamic ip/ports
auth timeouts
support packet fragmentation

Nice to have

support ipv4 options
support ipv6
support tcp ;)

Debug

https://hpd.gasmi.net/