lycoris

a bpf based proxy

currently, many proxy use http proxy or socks5 proxy protocol, all of them need the program support proxy protocol

actually this is a big limit, when you use some programs don't support specify the proxy, or it's very hard to enable the proxy, you will want to smash you computer :(

lycoris can solve this problem, at least solve the 95%

how it work

there are 3 parts about lycoris

• lycoris-bpf
• lycoris-client
• lycoris-server
• lycoris-protocol

lycoris-bpf

lycoris-bpf will hook all socket connect, and check if the dst ip should be proxies or not, if it is a need proxy ip, lycoris-bpf will change the socket dst ip to lycoris-client, and save the real dst ip and port in bpf socket sk_storage, then hook lycoris-client TcpListener getsockname to allow lycoris-client get the real dst ip and port, so lycoris-client can get it and send the dst ip and port to lycoris-server to connect the target

also lycoris-bpf>4.0 now will also hook getpeername for the connecting socket so it will get the real dst ip and port too

lycoris-client

lycoris-client will listen a tcp socket, when a new tcp accepted, it will get the real dst ip and port through hooked getsockname, and send to lycoris-server

lycoris-server

lycoris-server is a simple proxy server, like camouflage, trojan or something else

lycoris-protocol

lycoris-protocol provide a way to use lycoris transport protocol, it can base on any reliable transmission

the ip list file

it just a simple txt like

127.0.0.1/8
10.100.0.0/16

features

• TCP4 proxy
• UDP4 proxy(needs good idea)
• TCP6 proxy
• UDP6 proxy(needs good idea)
• ip list filter
• container proxy
  • need set container_bridge_listen_addr and container_bridge_listen_addr_v6
  • podman with slirp4netns doesn't need set, it connects tcp outside the container
  • docker need set, if use bridge+veth mode
• process comm filter

build

lycoris require nightly rust toolchain when build lycoris-bpf

build dependencies

• rust toolchain
• bpf-linker(can installed by cargo install)

just run cargo build --release

notes

1. you can't build in the lycoris root dir, you should build inside bpf, client, server dir, because lycoris-bpf target is bpfel-unknown-none
2. when build the lycoris-bpf, you must use release build mode, otherwise rustc and llvm will generate some instruction which will make bpf verifier unhappy