note.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;
using System.Net.Http;

namespace HackSagemRouter
{
    class Program
    {
        static void Main(string[] args)
        {
            var sagemClient = new SagemClient();
            sagemClient.Reboot();
            Console.ReadLine();
        }

        public void UpdateViewHttpWebRequest()
        {
            // view - source:http://192.168.1.1/wlmacflt.cmd?action=view
            // http://192.168.1.1/wlmacflt.cmd?wlmacflt.cmd?action=remove&rmLst=8:B1:DB:D7:AA:3D&sessionKey=154855720
            var cookies = new CookieContainer();

            HttpWebRequest request = RequestFactory("http://192.168.1.1/wlmacflt.cmd?action=view", cookies);
            string sessionKey = string.Empty;
            // Wil try to get a session key which will be used to remove mask
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader responseReader = new StreamReader(response.GetResponseStream()))
            {
                string output = responseReader.ReadToEnd();
                Console.WriteLine(output);
                int idx = output.IndexOf("sessionKey=");
                idx += nameof(sessionKey).Length + 1;
                int endIdx = output.IndexOf("\"", idx);
                sessionKey = output.Substring(idx, endIdx - idx);
            }

            request = RequestFactory("http://192.168.1.1/wlmacflt.cmd?wlmacflt.cmd?action=remove&rmLst=8:B1:DB:D7:AA:3D&sessionKey=" + sessionKey, cookies);
            response = (HttpWebResponse)request.GetResponse();
            using (StreamReader responseReader = new StreamReader(response.GetResponseStream()))
            {
                string output = responseReader.ReadToEnd();
                Console.WriteLine(output);
            }

            Console.ReadLine();
            //GET /wlmacflt.cmd?action=view HTTP/1.1
            //Host: 192.168.1.1
            //Connection: keep-alive
            //Cache-Control: max-age=400
            //Authorization: Basic YWRtaW46My4xNDE1
            //Upgrade-Insecure-Requests: 1
            //User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.59 Safari/537.36
            //Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
            //DNT: 1
            //Accept-Encoding: gzip, deflate, sdch
            //Accept-Language: en-US,en;q=0.8,pt;q=0.6
        }
        public static HttpWebRequest RequestFactory(string url, CookieContainer cookies)
        {
            var request = (HttpWebRequest)WebRequest.Create(url);
            // Note: Working without cookies.
            request.CookieContainer = cookies;
            request.Method = "GET";
            // Is this really neccesary for second call if we are using cookie? - Look like it is :D (tested)
            request.Headers["Authorization"] = "Basic YWRtaW46My4xNDE1";
            request.UserAgent = "Hack";
            request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
            request.Accept = "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
            return request;

            // Google KeepAlive, Cache-Control http-header
        }

    }
}


You need dat cookie jar
{
	CookieContainer cookies = new CookieContainer();
	HttpClientHandler handler = new HttpClientHandler();
	handler.CookieContainer = cookies;

	HttpClient client = new HttpClient(handler);
	HttpResponseMessage response = client.GetAsync("http://google.com").Result;

	Uri uri = new Uri("http://google.com");
	IEnumerable<Cookie> responseCookies = cookies.GetCookies(uri).Cast<Cookie>();
	foreach (Cookie cookie in responseCookies)
		Console.WriteLine(cookie.Name + ": " + cookie.Value);
}