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Building an Interactive TCP Proxy in Rust
Building network testing tools often reveals the complexity hidden beneath simple requirements. This article documents the creation of an interactive TCP proxy in Rust that allows real-time simulation of various network conditions — from latency injection to complete connection blocking.
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The Problem
Testing application resilience under adverse network conditions traditionally requires either modifying production infrastructure or using complex simulation tools. What if you could simply place a proxy between your application and any service, then dynamically inject failures, latency, or bandwidth constraints?
That’s the goal: a lightweight TCP proxy with an interactive menu that lets you switch between different network behaviors on the fly.
The Architecture
Technology Choices
The proxy is built using:
- Rust — For memory safety and performance
- Tokio 1.0 — Async runtime for concurrent I/O
- Crossterm 0.27 — Cross-platform terminal manipulation
These weren’t arbitrary choices. Tokio provides mature async I/O primitives, Crossterm…
