sqredirect 1.2.1

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sqredirect

Redirection and filtering Source Engine game traffic in a bundle with sqproxy

How it Works?

sqredirect attach eBPF filter(s) to network interface and manipulate with traffic targeting to game ports

eBPF is more efficient way to check/accept/drop packets in Linux

More in Wikipedia

Requirements

• Linux
• Kernel version >= 4.4, check your by command: uname -r
• python2 or python3

Installation

TODO: Split into Ubuntu/Debian/Others like in bcc-tools README

Step 1: Install bcc-tools

• bcc-tools >= 0.10.0 (depends on Kernel version, see https://github.com/iovisor/bcc/releases)
  • Install instruction (non-Debian 10)
  • Install instruction (Debian 10)
  • You can check the current version via python -c 'import bcc; print(bcc.__version__);'

Step 2: Install sqredirect

python -m pip install sqredirect

https://pypi.org/project/sqredirect/

Usage

Automatically

Only by SQProxy

Non-root running

bcc-tools can't be used w/o root, see https://github.com/iovisor/bcc/issues/1166

But you can use this snippet to restrict usage only to specified user/group:

TL;DR: move python redirect.py $@ to command and add permissions in /etc/sudoers

---

1. Copy content of this folder to /usr/src/sqredirect

2. Create file in /usr/local/bin/sqredirect with content:

   #!/bin/bash
   
   cd /usr/src/sqredirect
   exec python2 /usr/src/sqredirect/redirect.py $@
   

3. chmod +x /usr/local/bin/sqredirect

4. Create group network and add user to group

   addgroup network
   usermod -aG network <user-which-should-it-run>
   

5. Allow run sqredirect command w/o root privileges

   echo "%network ALL=(root) NOPASSWD: /usr/local/bin/sqredirect" > /etc/sudoers.d/network
   

More about sudoers: https://www.digitalocean.com/community/tutorials/how-to-edit-the-sudoers-file

Troubleshooting

Problem: I can't reach my server through network

Solution: Rollback any changes at network level, run in console (if you have access):

tc qdisc del dev eth0 root

replace eth0 with your interface name