cvpn

A simple vpn written in C

Features:

• this is a cli vpn like openvpn
• Runs on TCP. Works pretty much everywhere, including on public WiFi where only TCP/443 is open or reliable.
• Uses only modern cryptography, with formally verified implementations.
• Small and constant memory footprint. Doesn't perform any heap memory allocations.
• Small (~25 KB), with an equally small and readable code base. No external dependencies.
• Works on Linux, macOS
• Doesn't leak between reconnects if the network doesn't change. Blocks IPv6 on the client to prevent IPv6 leaks.

Installation:

git clone https://github.com/krishpranav/cvpn
cd cvpn
make
./cvpn

• Example of using this on a server

sudo ./cvpn server vpnserver.key auto 1956

• Example of using on the client

sudo ./cvpn client vpn.key 34.216.127.34 1959

• for disconnection cvpn ctrl-c