107 lines
3.8 KiB
C#
107 lines
3.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net;
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using System.Security.Cryptography;
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using System.Text.RegularExpressions;
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namespace EonaCat.DnsTester.Helpers
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{
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internal class UrlHelper
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{
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private static readonly RandomNumberGenerator _randomNumberGenerator = RandomNumberGenerator.Create();
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public static event EventHandler<string> Log;
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public static void GetRandomUrls(ref List<string> urlList, int totalUrls)
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{
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var letters = GetRandomLetters();
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Dictionary<string, string> searchEngineUrls = new Dictionary<string, string>
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{
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{ "Yahoo", "https://search.yahoo.com/search?p=" },
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{ "Bing", "https://www.bing.com/search?q=" },
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{ "Google", "https://www.google.com/search?q=" },
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{ "Ask", "https://www.ask.com/web?q=" },
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{ "WolframAlpha", "https://www.wolframalpha.com/input/?i=" },
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{ "StartPage", "https://www.startpage.com/do/dsearch?query=" },
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{ "Yandex", "https://www.yandex.com/search/?text=" },
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{ "Qwant", "https://www.qwant.com/?q=" }
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};
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Random rand = new Random();
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List<string> urls = urlList;
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while (urls.Count < totalUrls)
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{
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int index = rand.Next(searchEngineUrls.Count);
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KeyValuePair<string, string> searchEngine = searchEngineUrls.ElementAt(index);
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string url = searchEngine.Value + letters;
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try
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{
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using (var client = new WebClient())
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{
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string responseString = client.DownloadString(url);
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// find all .xxx.com addresses
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MatchCollection hostNames = Regex.Matches(responseString, @"[.](\w+[.]com)");
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// Loop through the match collection to retrieve all matches and delete the leading "."
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HashSet<string> uniqueNames = new HashSet<string>();
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foreach (Match match in hostNames)
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{
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string name = match.Groups[1].Value;
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if (name != $"{searchEngine.Key.ToLower()}.com")
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{
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uniqueNames.Add(name);
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}
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}
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// Add the names to the list
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foreach (string name in uniqueNames)
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{
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if (urls.Count >= totalUrls)
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{
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break;
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}
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if (!urls.Contains(name))
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{
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urls.Add(name);
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}
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}
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}
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}
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catch (Exception ex)
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{
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searchEngineUrls.Remove(searchEngine.Key);
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SetStatus($"{searchEngine.Key}: {ex.Message}");
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}
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finally
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{
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letters = GetRandomLetters();
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}
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}
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urlList = urls;
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var urlText = "url" + (urlList.Count > 1 ? "'s" : string.Empty);
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SetStatus($"{urlList.Count} random {urlText} found");
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}
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private static string GetRandomLetters()
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{
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// Generate a cryptographically strong random string
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byte[] randomBytes = new byte[32];
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_randomNumberGenerator.GetBytes(randomBytes);
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return Convert.ToBase64String(randomBytes);
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}
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private static void SetStatus(string text)
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{
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Log?.Invoke(null, text);
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}
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}
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}
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