Building Clash Core in C++ Libraries | Generated by AI

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I’ll search for information about clash-core and how to build similar projects in C++.Now let me search for C++ networking libraries that could be used to build a similar proxy system.Let me search for more specific C++ libraries for protocol implementation and configuration parsing.Let me search for additional libraries commonly used for rule-based routing and protocol implementation.Let me search for information about protocol implementation libraries for proxies.Now I have comprehensive information to provide a detailed answer. Let me compile the response.

Question: How can I use C++ to build projects similar to Clash-core (which is built in Go)? What libraries will be used?

Answer:

Clash-core is a rule-based proxy tool that supports multiple protocols including HTTP, HTTPS, SOCKS5, Shadowsocks, VMess, Trojan, Snell, and WireGuard, with features like fake-IP DNS, transparent proxy, proxy groups for automatic failover and load balancing, and RESTful API capabilities. Building a similar project in C++ is feasible and offers performance benefits.

Core Networking Libraries

The foundation of your C++ proxy implementation should use event-driven asynchronous I/O libraries:

1. Boost.Asio - A powerful C++ library that provides tools for asynchronous I/O, concurrency, and networking with support for TCP, UDP, SSL/TLS, timers, and error handling through exceptions or error codes. Boost.Asio is industry-standard for high-performance networking applications and supports cross-platform development.

2. libevent - A sophisticated event notification framework with support for buffered network I/O, sockets, filters, rate-limiting, SSL, zero-copy file transmission, and built-in protocols including DNS, HTTP, and a minimal RPC framework. It’s battle-tested and widely used in production systems.

3. libhv - A cross-platform C/C++ network library that provides event-loop with non-blocking I/O and timers with simpler API than libevent/libev/libuv, supporting TCP/UDP/SSL/HTTP/WebSocket with built-in forward/reverse proxy service capabilities.

Protocol & Encryption Libraries

For implementing proxy protocols:

Configuration & DNS

1. YAML Parser - yaml-cpp is a YAML parser and emitter in C++ that builds a static library and supports the YAML 1.2 specification, making it suitable for parsing Clash-style configuration files. Alternatively, RapidYAML is a faster YAML parser library that provides significant parsing speedups in both parsing and emitting operations.

2. DNS Library - dns.c is a non-blocking DNS resolver library in a single file with no external dependencies, supporting both stub and recursive modes, compatible with any event loop. Alternatively, use CopernicaMarketingSoftware’s DNS-CPP for asynchronous DNS queries.

Architecture Overview

To build a Clash-like system in C++:

  1. Event Loop Layer - Use Boost.Asio or libevent for managing I/O operations across thousands of connections simultaneously
  2. Protocol Layer - Implement or wrap protocol handlers for HTTP/HTTPS, SOCKS5, Shadowsocks, and other proxies
  3. Rules Engine - Parse YAML configuration and implement rule-based routing (domain, IP, process name matching)
  4. DNS Handling - Integrate fake-IP DNS resolution to minimize DNS pollution
  5. API Controller - Use libevent’s HTTP server capabilities to expose a RESTful API for configuration
  6. Connection Management - Handle proxy groups with load balancing, failover, and latency testing

Performance Advantages

C++ implementation would provide faster performance compared to Go due to compiled code, lower memory overhead, and fine-grained control over resource allocation. Boost.Asio offers comparable or better performance than Go’s standard library for high-concurrency scenarios.

Begin with Boost.Asio or libhv for networking, yaml-cpp for configuration parsing, and OpenSSL for encryption. You can incrementally add protocol implementations (starting with SOCKS5 and HTTP proxy) before moving to more complex protocols like VMess and Trojan.

References:

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