static string[] fetchDnsIpResult(string domain)
{
Form1.instance.Invoke(new Action(() => { Form1.instance.addItem(domain); }));
string ip = "";
if (domain == Properties.Settings.Default.dnsServerName) return new string[] { Properties.Settings.Default.dnsServerIp };
if (dnsCache.ContainsKey(domain))
{
ip = dnsCache[domain].ip;
dnsCache[domain] = new CacheEntry(ip);
return splitIps(ip);
}
string url = string.Format(Properties.Settings.Default.dnsServer, domain);
WebRequest wr = WebRequest.Create(url);
try
{
var sr = new System.IO.StreamReader(wr.GetResponse().GetResponseStream(), true);
ip = sr.ReadToEnd();
}
catch(Exception)
{
throw new NetworkInformationException();
}
if (ip == "" || ip == domain) throw new NetworkInformationException();
if (dnsCache.Count > MaxCacheCount)
{
DateTime stamp = DateTime.Now; string victim = "";
foreach (KeyValuePair<string, CacheEntry> pair in dnsCache)
{
if (pair.Value.timeStamp < stamp) stamp = pair.Value.timeStamp; victim = pair.Key;
}
if (dnsCache.ContainsKey(victim)) dnsCache.Remove(victim);
}
try
{
dnsCache.Add(domain, new CacheEntry(ip));
}
catch { }
return splitIps(ip);
}
private void button2_Click(object sender, EventArgs e)
{
new System.Threading.Thread(new System.Threading.ThreadStart(() =>
{
Dictionary<string, string> hostsRecords = new Dictionary<string, string>();
foreach (string url in Properties.Settings.Default.hostsUpdate.Split('|'))
{
WebRequest wr = WebRequest.Create(url);
try
{
StreamReader sr = new StreamReader(wr.GetResponse().GetResponseStream());
while (!sr.EndOfStream)
{
string line = sr.ReadLine().Trim();
if (line.StartsWith("#")) continue;
string[] cols = line.Split(' ', '\t');
if (cols.Length < 2) continue;
string domain = cols[cols.Length - 1];
if (!hostsRecords.ContainsKey(domain))
hostsRecords.Add(domain, "");
if (!hostsRecords[domain].Contains(cols[0] + "\r"))
hostsRecords[domain] += cols[0] + "\r";
}
}
catch (Exception) { }
}
foreach (KeyValuePair<string, string> pair in hostsRecords)
{
CacheEntry entry = new CacheEntry(pair.Value); entry.timeStamp = DateTime.MaxValue;
if (Program.dnsCache.ContainsKey(pair.Key))
Program.dnsCache[pair.Key] = entry;
else
Program.dnsCache.Add(pair.Key, entry);
}
MessageBox.Show("更新完毕！");
})).Start();
}
