// System.Net.Dns.cs
//
// Author: Mads Pultz (mpultz@diku.dk)
+// Author: Lawrence Pit (loz@cable.a2000.nl)
//
// (C) Mads Pultz, 2001
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
using System;
using System.Net.Sockets;
using System.Text;
using System.Collections;
using System.Threading;
using System.Runtime.CompilerServices;
+using System.Runtime.Remoting.Messaging;
namespace System.Net {
- public sealed class Dns {
+ 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; }
- }
- }
-
- 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;
- }
-
- 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;
- }
-
- public static IPHostEntry EndGetHostByName(IAsyncResult asyncResult) {
- return ((DnsAsyncResult)asyncResult).Worker.Result;
- }
-
- public static IPHostEntry EndResolve(IAsyncResult asyncResult) {
- return ((DnsAsyncResult)asyncResult).Worker.Result;
- }
-
-
- [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);
-
- 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];
-
- he.HostName=h_name;
- he.Aliases=h_aliases;
- for(int i=0; i<h_addrlist.Length; i++) {
- addrlist[i]=IPAddress.Parse(h_addrlist[i]);
- }
- he.AddressList=addrlist;
-
- return(he);
- }
-
- public static IPHostEntry GetHostByAddress(IPAddress address) {
- if (address == null)
- throw new ArgumentNullException();
- return GetHostByAddress(address.ToString());
- }
-
- public static IPHostEntry GetHostByAddress(string address) {
- if (address == null) {
- throw new ArgumentNullException();
- }
-
- string h_name;
- string[] h_aliases, h_addrlist;
-
- bool ret = GetHostByAddr_internal(address, out h_name,
- out h_aliases,
- out h_addrlist);
- if (ret == false) {
- throw new SocketException(11001);
- }
-
- return(hostent_to_IPHostEntry(h_name, h_aliases,
- h_addrlist));
- }
-
- public static IPHostEntry GetHostByName(string hostName) {
- 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) {
- throw new SocketException(11001);
- }
-
- return(hostent_to_IPHostEntry(h_name, h_aliases,
- h_addrlist));
- }
-
- /// <summary>
- /// 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;
- }
-
- /// <summary>
- /// This method resolves a DNS-style host name or IP
- /// address.
- /// </summary>
- /// <param name=hostName>
- /// A string containing either a DNS-style host name (e.g.
- /// www.go-mono.com) or IP address (e.g. 129.250.184.233).
- /// </param>
- public static IPHostEntry Resolve(string hostName) {
- if (hostName == null)
- throw new ArgumentNullException();
-
- return GetHostByName (hostName);
- }
- }
+ static Dns ()
+ {
+ System.Net.Sockets.Socket.CheckProtocolSupport();
+ }
+
+ private delegate IPHostEntry GetHostByNameCallback (string hostName);
+ private delegate IPHostEntry ResolveCallback (string hostName);
+
+ public static IAsyncResult BeginGetHostByName (string hostName,
+ AsyncCallback requestCallback, object stateObject)
+ {
+ if (hostName == null)
+ throw new ArgumentNullException();
+
+ GetHostByNameCallback c = new GetHostByNameCallback (GetHostByName);
+ return c.BeginInvoke (hostName, requestCallback, stateObject);
+ }
+
+ public static IAsyncResult BeginResolve (string hostName,
+ AsyncCallback requestCallback, object stateObject)
+ {
+ if (hostName == null)
+ throw new ArgumentNullException();
+ ResolveCallback c = new ResolveCallback (Resolve);
+ return c.BeginInvoke (hostName, requestCallback, stateObject);
+ }
+
+ public static IPHostEntry EndGetHostByName (IAsyncResult asyncResult) \r
+ {
+ if (asyncResult == null)
+ throw new ArgumentNullException ("asyncResult");
+ AsyncResult async = (AsyncResult) asyncResult;
+ GetHostByNameCallback cb = (GetHostByNameCallback) async.AsyncDelegate;
+ return cb.EndInvoke(asyncResult);
+ }
+
+ public static IPHostEntry EndResolve (IAsyncResult asyncResult) \r
+ {
+ if (asyncResult == null)
+ throw new ArgumentNullException ("asyncResult");
+ AsyncResult async = (AsyncResult) asyncResult;
+ ResolveCallback cb = (ResolveCallback) async.AsyncDelegate;
+ 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) \r
+ {
+ IPHostEntry he = new IPHostEntry();
+ ArrayList addrlist = new ArrayList();
+
+ he.HostName = h_name;
+ he.Aliases = h_aliases;
+ for(int i=0; i<h_addrlist.Length; i++) {
+ IPAddress newAddress = IPAddress.Parse(h_addrlist[i]);
+
+ if( (Socket.SupportsIPv6 && newAddress.AddressFamily == AddressFamily.InterNetworkV6) ||
+ (Socket.SupportsIPv4 && newAddress.AddressFamily == AddressFamily.InterNetwork) )
+ addrlist.Add(newAddress);
+ }
+
+ if(addrlist.Count == 0)
+ throw new SocketException(11001);
+
+ he.AddressList = addrlist.ToArray(typeof(IPAddress)) as IPAddress[];
+ return he;
+ }
+
+ public static IPHostEntry GetHostByAddress(IPAddress address) \r
+ {
+ if (address == null)
+ throw new ArgumentNullException();
+ return GetHostByAddress (address.ToString());
+ }
+\r
+ public static IPHostEntry GetHostByAddress(string address) \r
+ {
+ 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");
+
+ /// Must check the IP format, might send an exception if
+ /// invalid string.
+ IPAddress.Parse(address);
+
+ string h_name;
+ string[] h_aliases, h_addrlist;
+
+ bool ret = GetHostByAddr_internal(address, out h_name,
+ out h_aliases,
+ out h_addrlist);
+ if (!ret)
+ throw new SocketException(11001);
+
+ return(hostent_to_IPHostEntry(h_name, h_aliases,
+ h_addrlist));
+ }
+
+ public static IPHostEntry GetHostByName(string hostName) \r
+ {
+ 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)
+ throw new SocketException(11001);
+
+ return(hostent_to_IPHostEntry(h_name, h_aliases,
+ h_addrlist));
+ }
+
+ /// <summary>
+ /// This method returns the host name associated with the local host.
+ /// </summary>
+ public static string GetHostName() \r
+ {
+ string hostName;
+
+ bool ret = GetHostName_internal(out hostName);
+
+ if (ret == false)
+ throw new SocketException(11001);
+
+ return hostName;
+ }
+
+ /// <summary>
+ /// This method resolves a DNS-style host name or IP
+ /// address.
+ /// </summary>
+ /// <param name=hostName>
+ /// A string containing either a DNS-style host name (e.g.
+ /// www.go-mono.com) or IP address (e.g. 129.250.184.233).
+ /// </param>
+ public static IPHostEntry Resolve(string hostName) \r
+ {
+ if (hostName == null)
+ throw new ArgumentNullException();
+
+ IPHostEntry ret = null;
+
+ try {\r
+ ret = GetHostByAddress(hostName);\r
+ }
+ catch{}
+
+ if(ret == null)\r
+ ret = GetHostByName(hostName);\r
+
+ return ret;
+ }
+ }
}
projects / mono.git / blobdiff