C#实现DNS解析服务

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97nX81pf4zU6+xGWA6zH5y062sZu61rF6/StY/L1IXp/FyMg6zGW9ciMbt7FcbAvvV4bG5PULccdH3a6sIkpbNMNPxNpu4dQv6tapFHVf9Gjo947JumNVK42ymO7pF/Rp2pboRrRZsJrFacHiEvYerfpW0L0mtrknjZdmurVvj5aobbH9NWjH+/tX0mrG60oyMW6mPP+xja7N3m+OxOYbQGuMpOPnbgdgRfb9eEkGSJJuvoTGhm8YFUSLsV22HCuvXdusfxLVbPPe1Wz9n2TyXqX8+bHxmcbLGlOlzhOlNV5ObPhmpF4xfe7mI+9XqstFdacZ5rCZ3fk1a0fWrVYc577aAoVAj60XTZd3MTuaxX89VHUei7Nevv/66TgRJS7dGN0ZZDq0UcgAhX3/9dXz3q9tnK4WuXwNmTxb2a2zYPFsZ+9W4YD+h6Vb0q47bnw8bLySrm1H2awR0729Sn6ZVwzl/oFz1q5O9O5nH5l76Na5F369nRJAkSf1VWQit0Q0wXRAlpvs19Kxn+vRnxcleou9X0yeCEN0a403T9TZPJbqpjDOYHmSvFX2/ttt2p+lWVpNHyfT3r8Y1rv70Ta8cq70437vpQtjZ3P7VQ8yKvl9rRNA1gnq9bpjVgiji+7W8qkUdUe9vkrS9azPSdCsd3j+c2G7D+5tcTe7kmrSi7lfdt2IB6+/hjN9+qekGWK0x3cRm707mcb6V/SkgBkXZr9euXTslgiRJxq8hpsPUawS6du1aBP2q61Bdv15SJ4J+lQzPa5LZk5rp85REv8Llv8/RXWO6MbpryeYiNI4xXn4216QVPl8iQL/Giej79YQIkiTpvqrXmw4zHRC9KPq1p0OF9avxua/d9jdkppzsiH5NbAI/X8L0Gz7dTasxbqvUFP0aoF/jRJT92tnZeSxqkiSpl3U3dSONa6I/ALXOzs6I+vWSdb9WX1Inys8fDvvUZjPeBv2a2G7p5w/bfz8X8fd8VuhXxIvo+7UqsUTYr9oO1fTr9upLoUTfr7cI/ZrY+Hx/4PaLsl/9fr8nsfj9/gj6Vd2h2236dTv9ijuBfgVuvyj//9empqbW1tYjiaK1tbWpqSmC//81Efr1eHPHnb4acUscb+6gX4HbL5p+nTt3bkFBgdfr9ScKr9dbUFAwd+5cV49DmH7dUX1Jndjs10bflQPnrpJETaPvyp2+xITZdqR5T33bnX7mBMLYU98WTb+2t7fPnj07Nzd3QqLIzc2dPXu22weh1NOi61Btvx67pE5s9isQL2q8lz8/TUgcpMZ7+U7/dYl7pZ4WXYfSrwAARCtMv+48dkkd+hUAACdKPS26DtX1a6s69CsAAE6Uelp0Harp113HW3cdb90ZDP0KAIATpZ4WpUB3BWPSr6HQrwAAOKH06y6rfpWPt6pDvwIA4ESpp0XXodp+PdGqDv0KAIATpZ4WXYfq+7VCFfoVAAAnSj0tFdoO1fRrBf0KAIB7Yfr1y5OX1aFfAQBwotTToutQ+hUAgGiF6dfdJy+rQ78CAOBEqadF16Hafj11WR36FQAAJ0o9LboO1fRr5anL6tCvAAA4Uepp0XWopl+/On1ZHfoVAAAnSj0tug7V9WubOvQrAABOlHpadB2q6dc9p9vUoV8BAHCi1NOi61BNv+6taVOHfgUAwIlST4uuQ4X16+6q2kVb9r75URkhhBAS71m0Ze/uqlph/brvzBV1XPXr0frWWt/VAAAA8a/Wd/Wr0z5X/arrUE2/7j9zRR23/XqnHw0AAIRx26+6DtX064HaK+rQrwCAXsttv+o6VNOvB+uuqEO/AgB6Lbf9qutQXb+2qxNxv0pSz5zqlWFPRj1G0rKZ2TiJboyQ47HZu5OpAADxxX2/ajpU06+H6tvViaxf1V0YOsqwpWgcY5zH9F7jJLplqzkjPh7jMv0KAInHbb/qOlTTr3+vb1cnyn7VieD1om6lwH6N4Hhsup9+BYDE47ZfdR2q6dfDDe3qRNyvon4ea7WVq6noVwBABNz2q65DNf16pOGqOtG/fo2mz5yvsZ9H4PHovnUwrXAAQGJw26+6DtX069GzV9WJwX6NrBQFHo9uvdWLdQBAvHPbr7oOjad+FTtDNFUdQesDAOKLyH71NF5VR+C/zzFdozuTsL+1lbRM57EaI+R4rF6q8voVABKP237VdaimX6sar6rD50sAAHott/2q61BNv1Y3dahDvwIAei23/arrUE2/HmvqUId+BQD0Wm77Vdeh2n4916EO/QoA6LVc96u2QzX9etzboQ6fP2z15imbIwQAJAa3/apU5wmvX1nQ9OsJr18dPn/Yao/GmQEACcZtv+o6VNOvJ73+k17/yfN+ZYHPH6ZfAaDXctuv3R0ajLZfz/vV4fOHw/YrPxwGgETlul+1Harp11Pn/erE2uc3RTaPwOOxKVQqFgASjNt+1XWopl9PX/CfvuA/FUwM9mtkpSjweBweJwAg3rnt11CHKgu6fu1UJ9b6VewM0VS1/W92AQAJwH2/ajpU0681zZ01F3rC5w872cp4zACABOC2X2sudKpr1NCvqvD5EgCAXst1v2o7VNOvZ5o71aFfAQC9ltt+1XUo/QoAgAmR/Vrr61SHfgUA9Fpu+1XXobekX8O+U8mKk3czhX0/kcN3IYU9nrDzmB4hACAxxFy/Smbv7HXSQMYys5/QahLdstWcYUs67DymBwYASAxi+/Vare9ara9TWejNnz9sPzKCl+YAgPjivl+vqSP+/U1WPzKNrF/tG9fJVJH1q9WwyM4LABB3RL6/Sez/T2ezbMVJv7qdR+zxRDYPACDuiPz/6fbUtIWyt6YtBvs1gkkiPh6bAfQrACQ8t/2q61BNv5Z5WsqqehJr/Sp2Bue/f41mHgBAnHLbr7oOFd+vgYT4/GGH85ieCAAgAcRivwIAEO/oVwAAxKNfAQAQj34FAEC8WOzXiN8H5OTdTMaZjZOEfTeTk+Nx+K6osMcDAIhHMdevktk7e52UkNUbeq0mtJpEt2w1Z9iSDjuPk+MBAMSp2O1XHbevX40rBfZr2OOxH0m/AkDCi8V+FfLzYZutXE0VWb9aDdP9sNrtbACAeBGL/Ro6OLcN5KRf3c4j9nh0662+mQAAxLve1a8RTBLx8dgMiKz1AQBxpBf1q9gZnP/+1WZb058VAwASQMz1a6A3ff6w6TEDABJALPYrAADxjn4FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxKNfAQAQj34FAEA8+hUAAPHoVwAAxIuhfq31Xb3TjwYAAALU+q7GSr96L16pOt9OCCGEJEa8F6/ERL8CANBr0a8AAIhHvwIAIB79CgCAePQrAADi0a8AAIhHvwIAIB79CgCAePQrAADi0a8AAIhHvwIAIB79CgCAeGH6tdTTQgghhJDoc88RL/1KCCGECA79SgghhIgP/UoIIYSID/1KCCGEiA/9SgghhIhPT7/ec8RLCCGEEFGRAADArfD/Vp17f0aHU8QAAAAASUVORK5CYII=" alt="" />

利用ARSoft.Tools.Net实现一个客户端DNS解析服务，通过这个工具，可看到当前客户端对某个域名的解析地址是否正确。

ARSoft.Tools.Net是一个非常强大的开源DNS控件库，包含.Net SPF validation, SenderID validation以及DNS Client、DNS Server接口。

使用该接口可轻松实现DNS客户请求端及服务器解析端。项目地址:http://arsofttoolsnet.codeplex.com/或参考：http://i.isclab.org/?p=327

工具的主要代码：

private void btnDNS_Click(object sender, EventArgs e)
{
int QUERY_TIMEOUT = ;
string domain = txtDomain.Text;
string dnsAddr = txtDNSAddr.Text;
txtResult.Clear();
btnDNS.Enabled = false;
btnDNS.Text = "正在解析...";
new Thread(() =>
{
if (string.IsNullOrWhiteSpace(domain))
{
MessageBox.Show("待解析的域名不可为空");
return;
}
if (string.IsNullOrWhiteSpace(dnsAddr))
{
MessageBox.Show("DNS地址不可为空");
return;
}
//初始化DnsClient，第一个参数为DNS服务器的IP，第二个参数为超时时间
//DnsClient dnsClient = new DnsClient(IPAddress.Parse("8.8.8.8"), QUERY_TIMEOUT);
DnsClient dnsClient = new DnsClient(IPAddress.Parse(dnsAddr), QUERY_TIMEOUT);
//解析域名。将域名请求发送至DNS服务器解析，第一个参数为需要解析的域名，第二个参数为解析类型， RecordType.A为IPV4类型
//DnsMessage dnsMessage = dnsClient.Resolve("sso.zt-express.com", RecordType.A);
DnsMessage dnsMessage = dnsClient.Resolve(domain, RecordType.A);
//若返回结果为空，或者存在错误，则该请求失败。
if (dnsMessage == null || (dnsMessage.ReturnCode != ReturnCode.NoError && dnsMessage.ReturnCode != ReturnCode.NxDomain))
{
// return null;
//Console.WriteLine("没有解析成功");
this.Invoke(new Action(() =>
{
txtResult.Text = "没有解析成功";
btnDNS.Enabled = true;
btnDNS.Text = "解析"; }));
}
else
{
//循环遍历返回结果，将返回的IPV4记录添加到结果集List中。
foreach (DnsRecordBase dnsRecord in dnsMessage.AnswerRecords)
{
ARecord aRecord = dnsRecord as ARecord;
if (aRecord != null)
{
//resultIpList.Add(aRecord.Address.ToString());
//Console.WriteLine(aRecord.Address.ToString());
this.Invoke(new Action(() =>
{
txtResult.AppendText(aRecord.Address.ToString() + "\r\n");
}));
}
else
{
continue;
}
}
this.Invoke(new Action(() =>
{
btnDNS.Enabled = true;
btnDNS.Text = "解析";
})); } }).Start(); }