transocks-wong

Feature

• Event-driven non-blocking I/O model
• IPv4 and IPv6 support, IPv6 works in dual stack mode
• SOCKS5 works in noauth mode
• Buffer copy via bufferevent provided by libevent
• Zero copy via splice() syscall provided by modern Linux kernel

Prerequisite

netfilter_conntrack, iptables NAT/REDIRECT, modern Linux kernel with IPv6 support

Usage

Run transocks-wong -h to check help text. You can send SIGHUP to dump all connection we are handling, and send SIGUSR1 to close all connection manually, it's equivalent to restart the program.

As usual, send SIGTERM or SIGINT to terminate.

examples:

transocks-wong --listener-addr-port=[::]:8123 --socks5-addr-port=[::1]:1081 --pump-method=splicepump
transocks-wong --listener-addr-port=0.0.0.0:8123 --socks5-addr-port=127.0.0.1:1081

Other Tips

DNSMasq can be used to add resolved ip address to the appropriate IPset.

# /etc/dnsmasq.conf
ipset=/<domain>/setmefree,setmefree6

Use two IPset, one for IPv4, the other one for IPv6, to enable us to redirect IPv4/IPv6 traffic simultaneously based on the matching result.

## /etc/firewall.user(OpenWrt)
# This file is interpreted as shell script.
# drop old one
ipset -! destroy setmefree
ipset -! destroy setmefree6
# new ipset syntax, create TCP ipset
ipset -! create setmefree hash:net family inet
ipset -! create setmefree6 hash:net family inet6
# example to add IP range
#telegram IPs
ipset -! add setmefree 91.108.56.0/23
ipset -! add setmefree 91.108.56.0/22
ipset -! add setmefree 91.108.4.0/22
ipset -! add setmefree 149.154.172.0/22
ipset -! add setmefree 149.154.168.0/22
ipset -! add setmefree 149.154.164.0/22
ipset -! add setmefree 109.239.140.0/24

ipset -! add setmefree6 2001:b28:f23f::/48
ipset -! add setmefree6 2001:b28:f23d::/48
ipset -! add setmefree6 2001:67c:4e8::/48
# TCP redirect to TCP transparent proxy listening port
iptables -t nat -I PREROUTING -p tcp -m set --match-set setmefree dst -j REDIRECT --to-port 8123
# requires ip6tables nat module
ip6tables -t nat -I PREROUTING -p tcp -m set --match-set setmefree6 dst -j REDIRECT --to-port 8123

Credit to

• transocks-ev
• redsocks
• transocks