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/