Documentation

ProxyCheckCpp

This C++ program is designed to check whether a given IP address is a proxy by using a local list of proxies and an external web service. Let's break down the code step by step:

Libraries Included

• #include <iostream>: This library is used for input and output operations.
• #include <vector>: This library provides the std::vector container which is used to store the list of proxies.
• #include <string>: This library allows the use of the std::string class for string manipulation.
• #include <fstream>: This library is used for file input and output, allowing the program to read the proxy list from a file.
• #include <algorithm>: This library provides algorithms like std::find used for searching in the vector.
• #include <curl/curl.h>: This library is used for making HTTP requests. It provides the capability to query the external proxy-checking service.

ProxyChecker Class

The ProxyChecker class encapsulates the functionality for checking whether an IP address is a proxy.

Private Members

• proxyList: A vector of strings that holds the list of proxy IPs.

Private Methods

1. loadProxyList:

   • Takes a filename as input.
   • Reads the file line by line and populates the proxyList vector with the IPs.

2. isInProxyList:

   • Checks if a given IP is present in the proxyList. It returns true if found, otherwise false.

3. WriteCallback:

   • A static method used as a callback for the libcurl library. It appends the data received from the HTTP request to a string.

4. checkWithExternalService:

   • Uses libcurl to send a GET request to an external proxy-checking API.
   • Constructs the URL using the provided IP and an API key (placeholder YOUR_API_KEY should be replaced with an actual key).
   • If the request is successful, it checks the response for the presence of "proxy": true, indicating that the IP is a proxy.

Public Methods

1. ProxyChecker Constructor:

   • Takes a filename as input and loads the proxy list from that file by calling loadProxyList.

2. isProxy:

   • Checks if the given IP is in the local proxy list. If not, it calls checkWithExternalService to check against the external service.

Main Function

The main function is the entry point of the program.

• It creates an instance of ProxyChecker, loading proxies from a file named "proxies.txt".
• It prompts the user to enter an IP address to check.
• It calls the isProxy method of the ProxyChecker instance with the provided IP and prints whether the IP is a proxy or not.

Summary

In summary, this program provides a way to check if an IP address is a proxy by:

1. Checking a local list of proxies.
2. Making an HTTP request to an external service if the IP is not found in the local list.

Make sure to replace YOUR_API_KEY with an actual API key for the external service to use the program successfully.