TCP Violation method:

Implementation 1:
python asyncio + aioquic + scapy

Requirenemts:

• a VPS with filtered ip
• in windows: Npcap (can be installed with wireshark)
• python 3.10+
• scapy and aioquic (python library)

How to run:

• if you are on windows install Npcap or wireshark
• install python library using pip install aioquic pip install scapy or if you want system-wide sudo apt-get install python3-scapy sudo apt-get install python3-aioquic
• setup port_mapping and vps_ip in parameters.py
• make sure vio_tcp_server_port & vio_tcp_client_port closed by ufw and windows firewall is on sudo ufw deny 45000 yes we drill blocked port :)
  make sure tcp violation port blocked by ufw
  to avoid unwanted RST packet sent by os
  
• copy all files in both server and your pc (need ROOT/ADMIN)
• run in server and client sudo python3 mainserver.py python mainclient.py
• enjoy bypassing

port mapping guide:

example:
tcp_port_mapping = {14000:443}
put 127.0.0.1:14000 in client config to point to mainclient.py
create a config on port 443 on server side to accept from mainserver.py
data tunneled from client:tcp:14000 to server:tcp:443