scotthaleen / how-to-build-a-tcp-proxy

The code for my blog post series on building a TCP proxy

How to make a TCP proxy

This is the code from my series on how to build a TCP proxy:

• How to build a TCP proxy #1: Intro.
• How to build a TCP proxy #2: Fake DNS Server.
• How to build a TCP proxy #3: Proxy Server.
• How to build a TCP proxy #3: Fake Certificate Authority.

Installation

1. Clone this repo
2. In the repo directory, make a new virtualenv using virtualenv vendor
3. Activate it using source vendor/bin/activate
4. Install requirements to the virtualenv using pip install -r requirements.txt
5. Whenever you want to run the code, activate the virtualenv by running source vendor/bin/activate again

Usage

Fake DNS Server

Set your phone's DNS server to be the local IP of your laptop. Then run:

sudo python fake_dns_server.py

For lots more detail, see How to build a TCP proxy #2: Fake DNS Server.

Non-TLS TCP proxy

Set the DNS Spoofer running, then:

sudo python tcp_proxy.py

For lots more detail, see How to build a TCP proxy #3: Proxy Server.

TLS TCP proxy

Set the DNS Spoofer running, then:

sudo python tls_tcp_proxy.py

For lots more detail, see How to build a TCP proxy #4: Proxy Server.