// System.Net.Dns.cs
//
// Author: Mads Pultz (mpultz@diku.dk)
+// Author: Lawrence Pit (loz@cable.a2000.nl)
//
// (C) Mads Pultz, 2001
using System.Collections;
using System.Threading;
using System.Runtime.CompilerServices;
+using System.Runtime.Remoting.Messaging;
namespace System.Net {
public sealed class Dns {
private Dns () {}
-
- /// <summary>
- /// Helper class
- /// </summary>
- private sealed class DnsAsyncResult: IAsyncResult {
- private object state;
- private WaitHandle waitHandle;
- private bool completedSync, completed;
- private Worker worker;
-
- public DnsAsyncResult(object state) {
- this.state = state;
- waitHandle = new ManualResetEvent(false);
- completedSync = completed = false;
- }
- public object AsyncState {
- get { return state; }
- }
- public WaitHandle AsyncWaitHandle {
- set { waitHandle = value; }
- get { return waitHandle; }
- }
- public bool CompletedSynchronously {
- get { return completedSync; }
- }
- public bool IsCompleted {
- set { completed = value; }
- get { return completed; }
- }
- public Worker Worker {
- set { worker = value; }
- get { return worker; }
- }
- }
- /// <summary>
- /// Helper class for asynchronous calls to DNS server
- /// </summary>
- private sealed class Worker {
- private AsyncCallback reqCallback;
- private DnsAsyncResult reqRes;
- private string req;
- private IPHostEntry result;
-
- public Worker(string req, AsyncCallback reqCallback, DnsAsyncResult reqRes) {
- this.req = req;
- this.reqCallback = reqCallback;
- this.reqRes = reqRes;
- }
- private void End() {
- reqCallback(reqRes);
- ((ManualResetEvent)reqRes.AsyncWaitHandle).Set();
- reqRes.IsCompleted = true;
- }
- public void GetHostByName() {
- lock(reqRes) {
- result = Dns.GetHostByName(req);
- End();
- }
- }
- public void Resolve() {
- lock(reqRes) {
- result = Dns.Resolve(req);
- End();
- }
- }
- public IPHostEntry Result {
- get { return result; }
- }
- }
+ private delegate IPHostEntry GetHostByNameCallback (string hostName);
+ private delegate IPHostEntry ResolveCallback (string hostName);
- public static IAsyncResult BeginGetHostByName(string hostName,
+ public static IAsyncResult BeginGetHostByName (string hostName,
AsyncCallback requestCallback, object stateObject)
{
- DnsAsyncResult requestResult = new DnsAsyncResult(stateObject);
- Worker worker = new Worker(hostName, requestCallback, requestResult);
- Thread child = new Thread(new ThreadStart(worker.GetHostByName));
- child.Start();
- return requestResult;
+ if (hostName == null)
+ throw new ArgumentNullException();
+ GetHostByNameCallback c = new GetHostByNameCallback (GetHostByName);
+ return c.BeginInvoke (hostName, requestCallback, stateObject);
}
- public static IAsyncResult BeginResolve(string hostName,
+ public static IAsyncResult BeginResolve (string hostName,
AsyncCallback requestCallback, object stateObject)
{
- DnsAsyncResult requestResult = new DnsAsyncResult(stateObject);
- Worker worker = new Worker(hostName, requestCallback, requestResult);
- Thread child = new Thread(new ThreadStart(worker.Resolve));
- child.Start();
- return requestResult;
+ if (hostName == null)
+ throw new ArgumentNullException();
+ ResolveCallback c = new ResolveCallback (Resolve);
+ return c.BeginInvoke (hostName, requestCallback, stateObject);
}
- public static IPHostEntry EndGetHostByName(IAsyncResult asyncResult) {
- return ((DnsAsyncResult)asyncResult).Worker.Result;
+ public static IPHostEntry EndGetHostByName (IAsyncResult asyncResult) {
+ if (asyncResult == null)
+ throw new ArgumentNullException ("asyncResult");
+ AsyncResult async = (AsyncResult) asyncResult;
+ GetHostByNameCallback cb = (GetHostByNameCallback) async.AsyncDelegate;
+ asyncResult.AsyncWaitHandle.WaitOne ();
+ return cb.EndInvoke(asyncResult);
}
- public static IPHostEntry EndResolve(IAsyncResult asyncResult) {
- return ((DnsAsyncResult)asyncResult).Worker.Result;
+ public static IPHostEntry EndResolve (IAsyncResult asyncResult) {
+ if (asyncResult == null)
+ throw new ArgumentNullException ("asyncResult");
+ AsyncResult async = (AsyncResult) asyncResult;
+ ResolveCallback cb = (ResolveCallback) async.AsyncDelegate;
+ asyncResult.AsyncWaitHandle.WaitOne ();
+ return cb.EndInvoke(asyncResult);
}
-
-
+
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static bool GetHostByName_internal(string host, out string h_name, out string[] h_aliases, out string[] h_addr_list);
+
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static bool GetHostByAddr_internal(string addr, out string h_name, out string[] h_aliases, out string[] h_addr_list);
+ [MethodImplAttribute(MethodImplOptions.InternalCall)]
+ private extern static bool GetHostName_internal(out string h_name);
+
private static IPHostEntry hostent_to_IPHostEntry(string h_name, string[] h_aliases, string[] h_addrlist) {
IPHostEntry he = new IPHostEntry();
IPAddress[] addrlist = new IPAddress[h_addrlist.Length];
if (address == null) {
throw new ArgumentNullException();
}
-
+
+ // Undocumented MS behavior: when called with IF_ANY,
+ // this should return the local host
+ if (address.Equals ("0.0.0.0"))
+ return GetHostByAddress ("127.0.0.1");
+
string h_name;
string[] h_aliases, h_addrlist;
}
public static IPHostEntry GetHostByName(string hostName) {
- if (hostName == null) {
+ if (hostName == null)
throw new ArgumentNullException();
- }
-
+
string h_name;
string[] h_aliases, h_addrlist;
bool ret = GetHostByName_internal(hostName, out h_name,
out h_aliases,
out h_addrlist);
- if (ret == false) {
+ if (ret == false)
throw new SocketException(11001);
- }
return(hostent_to_IPHostEntry(h_name, h_aliases,
h_addrlist));
/// This method returns the host name associated with the local host.
/// </summary>
public static string GetHostName() {
- IPHostEntry h = GetHostByAddress("127.0.0.1");
- return h.HostName;
+ string hostName;
+
+ bool ret = GetHostName_internal(out hostName);
+
+ if (ret == false)
+ throw new SocketException(11001);
+
+ return hostName;
}
/// <summary>
projects / mono.git / blobdiff