Annon Proxy Server

Such proxy redirects requests from clients to different servers (globally or within a single local network). It can be used for load balancing in different Internet services, for testing web applications, for secured access to local network servers (all "non-client" traffic is ignored).

There are 2 ways to do this. The first is to manually change the settings in /etc/environment, but you will definitely need root access to do that. You can also use the Network Manager utility (compatible with all common DEs). You just have to make sure beforehand that the driver for the network adapter to work properly is installed on the system.

Bouncy Castle is a popular cryptography library in C#. If you want to parse and extract Certificate Signing Request (CSR) extensions using Bouncy Castle, you can follow these steps

Add Bouncy Castle Library

First, make sure you have the Bouncy Castle library added to your project. You can do this via NuGet Package Manager:

Install-Package BouncyCastle

Parse CSR:

Use Bouncy Castle to parse the CSR. The following code demonstrates how to parse a CSR from a PEM-encoded string:

using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.OpenSsl;
using Org.BouncyCastle.X509;
using System;
using System.IO;

class Program
{
    static void Main()
    {
        string csrString = File.ReadAllText("path/to/your/csr.pem");

        Pkcs10CertificationRequest csr = ParseCSR(csrString);

        // Now you can work with the parsed CSR
    }

    static Pkcs10CertificationRequest ParseCSR(string csrString)
    {
        PemReader pemReader = new PemReader(new StringReader(csrString));
        object pemObject = pemReader.ReadObject();

        if (pemObject is Pkcs10CertificationRequest csr)
        {
            return csr;
        }

        throw new InvalidOperationException("Invalid CSR format");
    }
}

Extract Extensions:

Once you have the CSR parsed, you can extract extensions using the GetAttributes method. Extensions in a CSR are typically stored in the Attributes property. Here's an example:

foreach (DerObjectIdentifier oid in csr.CertificationRequestInfo.Attributes.GetOids())
{
    Attribute attribute = csr.CertificationRequestInfo.Attributes[oid];

    // Work with the attribute, e.g., check if it's an extension
    if (oid.Equals(PkcsObjectIdentifiers.Pkcs9AtExtensionRequest))
    {
        X509Extensions extensions = X509Extensions.GetInstance(attribute.AttrValues[0]);

        // Now you can iterate over extensions and extract the information you need
        foreach (DerObjectIdentifier extOID in extensions.ExtensionOids)
        {
            X509Extension extension = extensions.GetExtension(extOID);
            // Process the extension
        }
    }
}

Modify the code according to your specific requirements and the structure of your CSR. The example assumes a basic structure, and you may need to adapt it based on your CSR format and the extensions you're interested in.

In UDP, the term "connected" has a different meaning compared to TCP. Since UDP is a connectionless protocol, there is no established connection between the sender and receiver. However, you can determine if the UDP socket is in a listening state or if it has been successfully created.

To check if a UDP socket is in a listening state, you can use the socket.SOCK_DGRAM type and the bind() method. If the socket is successfully created and bound to an address and port, it will be in a listening state and ready to receive incoming UDP packets.

Here's an example using Python:

import socket

# Create a UDP socket
server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

# Bind the socket to an address and port
server_address = ('localhost', 12345)
server_socket.bind(server_address)

# Check if the socket is in a listening state
print("Socket is in a listening state: ", server_socket.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1)

# Close the socket
server_socket.close()

In this example, the bind() method creates a UDP socket and binds it to the specified address and port. The getsockopt() method is used to retrieve the SO_REUSEADDR option, which indicates whether the socket is in a listening state. If the value is 1, the socket is in a listening state and ready to receive incoming UDP packets.

A proxy is just used to bypass torrent download blocking through your ISP's network. Separately, the proxy server can block the host, that is, the owner of the site where the torrent files are posted. But it happens mostly due to malicious violations of the rules for using such a resource (for example, "cheating" rating).