What is fuckprivateclient?

tatanakots/fuckprivateclient — explained in plain English

Analysis updated 2026-05-18

★ 28GoAudience · developerComplexity · 4/5LicenseSetup · moderate

Mindmap

mindmap
  root((FuckPrivateClient))
    What it does
      Extracts configs from private clients
      Enables use with open-source clients
      Reverse-engineering exercise
    Tech stack
      Go
    Use cases
      Use Clash or v2rayN with extracted config
      Study reverse-engineering techniques
      Avoid vendor lock-in proxy clients
    Audience
      Developers
    Notes
      Supports specific Fastlink versions
      No endorsement of any provider
      No warranty on service availability

mindmap root((FuckPrivateClient)) What it does Extracts configs from private clients Enables use with open-source clients Reverse-engineering exercise Tech stack Go Use cases Use Clash or v2rayN with extracted config Study reverse-engineering techniques Avoid vendor lock-in proxy clients Audience Developers Notes Supports specific Fastlink versions No endorsement of any provider No warranty on service availability

What do people build with it?

USE CASE 1

Extract a proxy configuration from a supported private client to use with an open-source client like Clash.

USE CASE 2

Study the reverse-engineering approach used to pull configuration data out of a closed-source binary.

USE CASE 3

Contribute analysis of another private proxy client by opening an issue or pull request.

What is it built with?

How does it compare?

	tatanakots/fuckprivateclient	shieldnet-360/prompt-gate	smallnest/agent-wrapper
Stars	28	28	28
Language	Go	Go	Go
Setup difficulty	moderate	—	—
Complexity	4/5	—	—
Audience	developer	ops devops	developer

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 1h+

Only documents support for specific Fastlink client versions, usage steps beyond compatibility are not covered.

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

So what is it?

FuckPrivateClient is a Go tool for extracting configuration files from proprietary proxy client applications. The README is written in Chinese and describes a utility that pulls the underlying network configuration out of private, closed-source clients so that the same configuration can be used with popular open-source alternatives such as Clash, v2rayN, and OpenClash. In the Chinese proxy service market, paid proxy providers often distribute custom, locked-down desktop clients rather than providing standard configuration files. This tool reverses that by extracting the configuration from the private client binary, letting the user run their chosen open-source client instead of the provider's proprietary one. The project currently documents support for specific Windows versions of a service called Fastlink, covering its standard edition (v1.19.23) and a lite edition (v3.0.3). The author notes in the README that the tool is intended for learning reverse-engineering techniques, and that the project does not endorse or recommend any particular proxy provider. There is also a disclaimer that the project takes no responsibility for the availability of any service or for funds users have paid to providers. Contributions are welcome: users who have other private clients they want analyzed can open an issue, and those who have already done analysis work can submit a pull request. The repository is open-source under the MIT license. The README is brief and does not cover installation or usage steps beyond the client compatibility list.

Copy-paste prompts

Prompt 1

Explain how FuckPrivateClient extracts configuration from a proprietary proxy client binary.

Prompt 2

Help me understand the reverse-engineering techniques used in this project for learning purposes.

Prompt 3

What Fastlink client versions does this tool currently support?

Frequently asked questions