C#独立域名查询

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whois.aspx

<% @Page Language="C#" %>
<% @Import Namespace="System.Net.Sockets" %>
<% @Import Namespace="System.Text" %>
<% @Import Namespace="System.IO" %>
<% @Import Namespace="System.Collections" %>
<script language="C#" runat="server">
void doQuery(Object sender, EventArgs e)
{
String strDomain = txtDomain.Text;
char[] chSplit = {'.'};
string[] arrDomain = strDomain.Split(chSplit);
// es darf genau ein domain name + ein suffix sein
if (arrDomain.Length != 2)
{
return;
}

// das suffic darf nur 2 oder 3 zeichen lang sein
int nLength = arrDomain[1].Length;
if (nLength != 2 && nLength != 3)
{
return;
}

Hashtable table = new Hashtable();
table.Add("at", "whois.nic.at");
table.Add("de", "whois.denic.de");
table.Add("be", "whois.dns.be");
table.Add("gov", "whois.nic.gov");
table.Add("mil", "whois.nic.mil");

String strServer = "whois.OnlineNIC.com";
if (table.ContainsKey(arrDomain[1]))
{
strServer = table[arrDomain[1]].ToString();
}
else if (nLength == 2)
{
// 2-letter TLD's always default to RIPE in Europe
strServer = "whois.ripe.net";
}

String strResponse;
bool bSuccess = DoWhoisLookup(strDomain, strServer, out strResponse);
if (bSuccess)
{
txtResult.Text = strResponse;
}
else
{
txtResult.Text = "Lookup failed";
}
}

bool DoWhoisLookup(String strDomain, String strServer, out String strResponse)
{
strResponse = "none";
bool bSuccess = false;

TcpClient tcpc = new TcpClient();
try
{
tcpc.Connect(strServer, 43);
}
catch(SocketException ex)
{
strResponse = "Could not connect to Whois server";
return false;
}

strDomain += "/r/n";
Byte[] arrDomain = Encoding.ASCII.GetBytes(strDomain.ToCharArray());
try
{
Stream s = tcpc.GetStream();
s.Write(arrDomain, 0, strDomain.Length);

StreamReader sr = new StreamReader(tcpc.GetStream(), Encoding.ASCII);
StringBuilder strBuilder = new StringBuilder();
string strLine = null;

while (null != (strLine = sr.ReadLine()))
{
strBuilder.Append(strLine+"<br>");
}
tcpc.Close();

bSuccess = true;
strResponse = strBuilder.ToString();
}
catch(Exception e)
{
strResponse = e.ToString();
}

return bSuccess;
}
</script>
<html>
<head>
<title></title>
</head>
<body>

<form runat="server">
域名whois查询(.NET版): <asp:TextBox id="txtDomain" value="3cts.com" runat="server" />
 <asp:Button id="btnQuery" OnClick="doQuery" text="Query!" runat="server" />
<BR><HR width="100%"><BR>
<asp:label id="txtResult" runat="server" />
</form>

</body>
</html>

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