496 lines
16 KiB
C#
496 lines
16 KiB
C#
// System.Net.Dns.cs
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//
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// Authors:
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// Mads Pultz (mpultz@diku.dk)
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// Lawrence Pit (loz@cable.a2000.nl)
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// Author: Mads Pultz (mpultz@diku.dk)
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// Lawrence Pit (loz@cable.a2000.nl)
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// Marek Safar (marek.safar@gmail.com)
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// Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
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//
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// (C) Mads Pultz, 2001
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// Copyright (c) 2011 Novell, Inc.
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// Copyright (c) 2011 Xamarin, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Net.Sockets;
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using System.Text;
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using System.Collections;
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using System.Threading;
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using System.Runtime.CompilerServices;
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using System.Runtime.Remoting.Messaging;
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using System.Threading.Tasks;
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#if !MOBILE
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using Mono.Net.Dns;
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#endif
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namespace System.Net {
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public static class Dns {
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#if !MOBILE
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static bool use_mono_dns;
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static SimpleResolver resolver;
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#endif
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static Dns ()
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{
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#if !MOBILE
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if (Environment.GetEnvironmentVariable ("MONO_DNS") != null) {
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resolver = new SimpleResolver ();
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use_mono_dns = true;
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}
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#endif
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}
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#if !MOBILE
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internal static bool UseMonoDns {
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get { return use_mono_dns; }
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}
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#endif
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private delegate IPHostEntry GetHostByNameCallback (string hostName);
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private delegate IPHostEntry ResolveCallback (string hostName);
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private delegate IPHostEntry GetHostEntryNameCallback (string hostName);
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private delegate IPHostEntry GetHostEntryIPCallback (IPAddress hostAddress);
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private delegate IPAddress [] GetHostAddressesCallback (string hostName);
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#if !MOBILE
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static void OnCompleted (object sender, SimpleResolverEventArgs e)
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{
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DnsAsyncResult ares = (DnsAsyncResult) e.UserToken;
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IPHostEntry entry = e.HostEntry;
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if (entry == null || e.ResolverError != 0) {
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ares.SetCompleted (false, new Exception ("Error: " + e.ResolverError));
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return;
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}
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ares.SetCompleted (false, entry);
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}
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static IAsyncResult BeginAsyncCallAddresses (string host, AsyncCallback callback, object state)
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{
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SimpleResolverEventArgs e = new SimpleResolverEventArgs ();
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e.Completed += OnCompleted;
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e.HostName = host;
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DnsAsyncResult ares = new DnsAsyncResult (callback, state);
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e.UserToken = ares;
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if (resolver.GetHostAddressesAsync (e) == false)
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ares.SetCompleted (true, e.HostEntry); // Completed synchronously
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return ares;
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}
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static IAsyncResult BeginAsyncCall (string host, AsyncCallback callback, object state)
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{
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SimpleResolverEventArgs e = new SimpleResolverEventArgs ();
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e.Completed += OnCompleted;
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e.HostName = host;
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DnsAsyncResult ares = new DnsAsyncResult (callback, state);
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e.UserToken = ares;
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if (resolver.GetHostEntryAsync (e) == false)
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ares.SetCompleted (true, e.HostEntry); // Completed synchronously
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return ares;
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}
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static IPHostEntry EndAsyncCall (DnsAsyncResult ares)
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{
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if (ares == null)
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throw new ArgumentException ("Invalid asyncResult");
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if (!ares.IsCompleted)
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ares.AsyncWaitHandle.WaitOne ();
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if (ares.Exception != null)
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throw ares.Exception;
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IPHostEntry entry = ares.HostEntry;
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if (entry == null || entry.AddressList == null || entry.AddressList.Length == 0)
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Error_11001 (entry.HostName);
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return entry;
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}
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#endif
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[Obsolete ("Use BeginGetHostEntry instead")]
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public static IAsyncResult BeginGetHostByName (string hostName, AsyncCallback requestCallback, object stateObject)
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{
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#if FEATURE_NO_BSD_SOCKETS
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throw new PlatformNotSupportedException ("System.Net.Dns:BeginGetHostByName is not supported on this platform.");
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#else
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if (hostName == null)
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throw new ArgumentNullException ("hostName");
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#if !MOBILE
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if (use_mono_dns)
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return BeginAsyncCall (hostName, requestCallback, stateObject);
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#endif
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GetHostByNameCallback c = new GetHostByNameCallback (GetHostByName);
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return c.BeginInvoke (hostName, requestCallback, stateObject);
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#endif // FEATURE_NO_BSD_SOCKETS
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}
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[Obsolete ("Use BeginGetHostEntry instead")]
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public static IAsyncResult BeginResolve (string hostName, AsyncCallback requestCallback, object stateObject)
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{
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#if FEATURE_NO_BSD_SOCKETS
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throw new PlatformNotSupportedException ("System.Net.Dns:BeginResolve is not supported on this platform.");
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#else
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if (hostName == null)
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throw new ArgumentNullException ("hostName");
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#if !MOBILE
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if (use_mono_dns)
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return BeginAsyncCall (hostName, requestCallback, stateObject);
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#endif
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ResolveCallback c = new ResolveCallback (Resolve);
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return c.BeginInvoke (hostName, requestCallback, stateObject);
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#endif // FEATURE_NO_BSD_SOCKETS
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}
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public static IAsyncResult BeginGetHostAddresses (string hostNameOrAddress, AsyncCallback requestCallback, object state)
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{
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if (hostNameOrAddress == null)
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throw new ArgumentNullException ("hostName");
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if (hostNameOrAddress == "0.0.0.0" || hostNameOrAddress == "::0")
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throw new ArgumentException ("Addresses 0.0.0.0 (IPv4) " +
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"and ::0 (IPv6) are unspecified addresses. You " +
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"cannot use them as target address.",
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"hostNameOrAddress");
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#if !MOBILE
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if (use_mono_dns)
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return BeginAsyncCallAddresses (hostNameOrAddress, requestCallback, state);
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#endif
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GetHostAddressesCallback c = new GetHostAddressesCallback (GetHostAddresses);
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return c.BeginInvoke (hostNameOrAddress, requestCallback, state);
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}
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public static IAsyncResult BeginGetHostEntry (string hostNameOrAddress, AsyncCallback requestCallback, object stateObject)
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{
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#if FEATURE_NO_BSD_SOCKETS
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throw new PlatformNotSupportedException ("System.Net.Dns:GetHostEntry is not supported on this platform.");
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#else
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if (hostNameOrAddress == null)
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throw new ArgumentNullException ("hostName");
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if (hostNameOrAddress == "0.0.0.0" || hostNameOrAddress == "::0")
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throw new ArgumentException ("Addresses 0.0.0.0 (IPv4) " +
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"and ::0 (IPv6) are unspecified addresses. You " +
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"cannot use them as target address.",
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"hostNameOrAddress");
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#if !MOBILE
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if (use_mono_dns)
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return BeginAsyncCall (hostNameOrAddress, requestCallback, stateObject);
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#endif
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GetHostEntryNameCallback c = new GetHostEntryNameCallback (GetHostEntry);
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return c.BeginInvoke (hostNameOrAddress, requestCallback, stateObject);
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#endif // FEATURE_NO_BSD_SOCKETS
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}
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public static IAsyncResult BeginGetHostEntry (IPAddress address, AsyncCallback requestCallback, object stateObject)
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{
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#if FEATURE_NO_BSD_SOCKETS
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throw new PlatformNotSupportedException ("System.Net.Dns:BeginGetHostEntry is not supported on this platform.");
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#else
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if (address == null)
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throw new ArgumentNullException ("address");
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#if !MOBILE
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if (use_mono_dns)
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return BeginAsyncCall (address.ToString (), requestCallback, stateObject);
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#endif
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GetHostEntryIPCallback c = new GetHostEntryIPCallback (GetHostEntry);
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return c.BeginInvoke (address, requestCallback, stateObject);
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#endif // FEATURE_NO_BSD_SOCKETS
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}
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[Obsolete ("Use EndGetHostEntry instead")]
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public static IPHostEntry EndGetHostByName (IAsyncResult asyncResult)
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{
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if (asyncResult == null)
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throw new ArgumentNullException ("asyncResult");
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#if !MOBILE
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if (use_mono_dns)
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return EndAsyncCall (asyncResult as DnsAsyncResult);
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#endif
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AsyncResult async = (AsyncResult) asyncResult;
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GetHostByNameCallback cb = (GetHostByNameCallback) async.AsyncDelegate;
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return cb.EndInvoke(asyncResult);
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}
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[Obsolete ("Use EndGetHostEntry instead")]
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public static IPHostEntry EndResolve (IAsyncResult asyncResult)
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{
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if (asyncResult == null)
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throw new ArgumentNullException ("asyncResult");
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#if !MOBILE
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if (use_mono_dns)
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return EndAsyncCall (asyncResult as DnsAsyncResult);
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#endif
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AsyncResult async = (AsyncResult) asyncResult;
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ResolveCallback cb = (ResolveCallback) async.AsyncDelegate;
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return cb.EndInvoke(asyncResult);
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}
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public static IPAddress [] EndGetHostAddresses (IAsyncResult asyncResult)
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{
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if (asyncResult == null)
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throw new ArgumentNullException ("asyncResult");
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#if !MOBILE
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if (use_mono_dns) {
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IPHostEntry entry = EndAsyncCall (asyncResult as DnsAsyncResult);
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if (entry == null)
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return null;
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return entry.AddressList;
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}
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#endif
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AsyncResult async = (AsyncResult) asyncResult;
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GetHostAddressesCallback cb = (GetHostAddressesCallback) async.AsyncDelegate;
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return cb.EndInvoke(asyncResult);
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}
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public static IPHostEntry EndGetHostEntry (IAsyncResult asyncResult)
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{
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if (asyncResult == null)
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throw new ArgumentNullException ("asyncResult");
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#if !MOBILE
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if (use_mono_dns)
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return EndAsyncCall (asyncResult as DnsAsyncResult);
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#endif
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AsyncResult async = (AsyncResult) asyncResult;
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if (async.AsyncDelegate is GetHostEntryIPCallback)
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return ((GetHostEntryIPCallback) async.AsyncDelegate).EndInvoke (asyncResult);
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GetHostEntryNameCallback cb = (GetHostEntryNameCallback) async.AsyncDelegate;
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return cb.EndInvoke(asyncResult);
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}
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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private extern static bool GetHostByName_internal(string host, out string h_name, out string[] h_aliases, out string[] h_addr_list, int hint);
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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private extern static bool GetHostByAddr_internal(string addr, out string h_name, out string[] h_aliases, out string[] h_addr_list, int hint);
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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private extern static bool GetHostName_internal(out string h_name);
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static void Error_11001 (string hostName)
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{
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throw new SocketException(11001, string.Format ("Could not resolve host '{0}'", hostName));
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}
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private static IPHostEntry hostent_to_IPHostEntry(string originalHostName, string h_name, string[] h_aliases, string[] h_addrlist)
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{
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IPHostEntry he = new IPHostEntry();
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ArrayList addrlist = new ArrayList();
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he.HostName = h_name;
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he.Aliases = h_aliases;
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for(int i=0; i<h_addrlist.Length; i++) {
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try {
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IPAddress newAddress = IPAddress.Parse(h_addrlist[i]);
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if( (Socket.SupportsIPv6 && newAddress.AddressFamily == AddressFamily.InterNetworkV6) ||
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(Socket.SupportsIPv4 && newAddress.AddressFamily == AddressFamily.InterNetwork) )
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addrlist.Add(newAddress);
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} catch (ArgumentNullException) {
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/* Ignore this, as the
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* internal call might have
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* left some blank entries at
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* the end of the array
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*/
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}
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}
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if(addrlist.Count == 0)
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Error_11001 (originalHostName);
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he.AddressList = addrlist.ToArray(typeof(IPAddress)) as IPAddress[];
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return he;
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}
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[Obsolete ("Use GetHostEntry instead")]
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public static IPHostEntry GetHostByAddress(IPAddress address)
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{
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if (address == null)
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throw new ArgumentNullException ("address");
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return GetHostByAddressFromString (address.ToString (), false);
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}
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[Obsolete ("Use GetHostEntry instead")]
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public static IPHostEntry GetHostByAddress(string address)
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{
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if (address == null)
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throw new ArgumentNullException ("address");
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return GetHostByAddressFromString (address, true);
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}
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static IPHostEntry GetHostByAddressFromString (string address, bool parse)
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{
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// Undocumented MS behavior: when called with IF_ANY,
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// this should return the local host
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if (address.Equals ("0.0.0.0")) {
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address = "127.0.0.1";
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parse = false;
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}
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// Must check the IP format, might send an exception if invalid string.
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if (parse)
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IPAddress.Parse (address);
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string h_name;
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string[] h_aliases, h_addrlist;
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bool ret = GetHostByAddr_internal(address, out h_name, out h_aliases, out h_addrlist, Socket.FamilyHint);
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if (!ret)
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Error_11001 (address);
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return (hostent_to_IPHostEntry (address, h_name, h_aliases, h_addrlist));
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}
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public static IPHostEntry GetHostEntry (string hostNameOrAddress)
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{
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if (hostNameOrAddress == null)
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throw new ArgumentNullException ("hostNameOrAddress");
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if (hostNameOrAddress == "0.0.0.0" || hostNameOrAddress == "::0")
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throw new ArgumentException ("Addresses 0.0.0.0 (IPv4) " +
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"and ::0 (IPv6) are unspecified addresses. You " +
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"cannot use them as target address.",
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"hostNameOrAddress");
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IPAddress addr;
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if (hostNameOrAddress.Length > 0 && IPAddress.TryParse (hostNameOrAddress, out addr))
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return GetHostEntry (addr);
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return GetHostByName (hostNameOrAddress);
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}
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public static IPHostEntry GetHostEntry (IPAddress address)
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{
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if (address == null)
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throw new ArgumentNullException ("address");
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return GetHostByAddressFromString (address.ToString (), false);
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}
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public static IPAddress [] GetHostAddresses (string hostNameOrAddress)
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{
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if (hostNameOrAddress == null)
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throw new ArgumentNullException ("hostNameOrAddress");
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if (hostNameOrAddress == "0.0.0.0" || hostNameOrAddress == "::0")
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throw new ArgumentException ("Addresses 0.0.0.0 (IPv4) " +
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"and ::0 (IPv6) are unspecified addresses. You " +
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"cannot use them as target address.",
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"hostNameOrAddress");
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IPAddress addr;
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if (hostNameOrAddress.Length > 0 && IPAddress.TryParse (hostNameOrAddress, out addr))
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return new IPAddress[1] { addr };
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return GetHostEntry (hostNameOrAddress).AddressList;
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}
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[Obsolete ("Use GetHostEntry instead")]
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public static IPHostEntry GetHostByName (string hostName)
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{
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#if FEATURE_NO_BSD_SOCKETS
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if (!string.IsNullOrEmpty (hostName))
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throw new PlatformNotSupportedException ("System.Net.Dns:GetHostByName is not supported on this platform.");
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#endif // FEATURE_NO_BSD_SOCKETS
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if (hostName == null)
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throw new ArgumentNullException ("hostName");
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string h_name;
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string[] h_aliases, h_addrlist;
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bool ret = GetHostByName_internal(hostName, out h_name, out h_aliases, out h_addrlist, Socket.FamilyHint);
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if (ret == false)
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Error_11001 (hostName);
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return(hostent_to_IPHostEntry(hostName, h_name, h_aliases, h_addrlist));
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}
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public static string GetHostName ()
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{
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string hostName;
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bool ret = GetHostName_internal(out hostName);
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if (ret == false)
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Error_11001 (hostName);
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return hostName;
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}
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[Obsolete ("Use GetHostEntry instead")]
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public static IPHostEntry Resolve(string hostName)
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{
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#if FEATURE_NO_BSD_SOCKETS
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throw new PlatformNotSupportedException ("System.Net.Dns:Resolve is not supported on this platform.");
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#else
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if (hostName == null)
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throw new ArgumentNullException ("hostName");
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IPHostEntry ret = null;
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try {
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ret = GetHostByAddress(hostName);
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}
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catch{}
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if(ret == null)
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ret = GetHostByName(hostName);
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return ret;
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#endif // FEATURE_NO_BSD_SOCKETS
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}
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public static Task<IPAddress[]> GetHostAddressesAsync (string hostNameOrAddress)
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{
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return Task<IPAddress[]>.Factory.FromAsync (BeginGetHostAddresses, EndGetHostAddresses, hostNameOrAddress, null);
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}
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public static Task<IPHostEntry> GetHostEntryAsync (IPAddress address)
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{
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return Task<IPHostEntry>.Factory.FromAsync (BeginGetHostEntry, EndGetHostEntry, address, null);
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}
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public static Task<IPHostEntry> GetHostEntryAsync (string hostNameOrAddress)
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{
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return Task<IPHostEntry>.Factory.FromAsync (BeginGetHostEntry, EndGetHostEntry, hostNameOrAddress, null);
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}
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}
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}
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