// 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.InteropServices;
+using System.Runtime.CompilerServices;
using System.Runtime.Remoting.Messaging;
namespace System.Net {
-
public sealed class 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 Dns () {}
+ static Dns ()
+ {
+ System.Net.Sockets.Socket.CheckProtocolSupport();
}
-
- /// <summary>
- /// This class conforms to the C structure <c>hostent</c> and is used
- /// by the Dns class when doing native calls.
- /// </summary>
- [StructLayout(LayoutKind.Sequential)]
- private unsafe class Hostent {
- public string h_name; /* official name */
- public byte** h_aliases; /* alias list */
- public short h_addrtype; /* address type */
- public short h_length; /* address length */
- public byte** h_addr_list; /* address list */
- }
-
- 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;
+
+ 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);
}
- [MonoTODO]
- public static IAsyncResult BeginResolve(string hostName,
- AsyncCallback requestCallback,
- object stateObject) {
- // TODO
- throw new NotImplementedException();
+ 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) {
- return ((DnsAsyncResult)asyncResult).Worker.Result;
+
+ 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);
}
- [MonoTODO]
- public static IPHostEntry EndResolve(IAsyncResult asyncResult) {
- // TODO
- throw new NotImplementedException();
+ 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);
- /// <param name=hostName>
- /// IP address in network byte order (e.g. Big-Endian).
- /// </param>
- /// <param name=length>
- /// Length of IP address.
- /// </param>
- /// <param name=type>
- /// Type (should be 2, equals AF_INET).
- /// </param>
- [DllImport("cygwin1", EntryPoint="gethostbyaddr")]
- private static extern IntPtr _GetHostByAddress(byte[] hostName,
- short length,
- short type);
-
- /// <param name=address>
- /// IP address in network byte order (e.g. Big-Endian).
- /// </param>
- [MonoTODO]
- private static IPHostEntry GetHostByAddress(long address) {
- short length = 4;
- if (address > uint.MaxValue)
- length = 8;
- byte[] addr = new byte[length];
- for(int i = length - 1, j = 0; i >= 0; --i, ++j) {
- byte b = (byte)(address >> i * 8);
-// Console.WriteLine(b);
- addr[j] = b;
+ 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);
}
- IntPtr p = _GetHostByAddress(addr, length, 2); // TODO: set type
- if (p == IntPtr.Zero)
- throw new SocketException(); // TODO: set error code
- Hostent h = new Hostent();
- System.Runtime.InteropServices.Marshal.PtrToStructure(p, h);
- return ToIPHostEntry(h);
+
+ if(addrlist.Count == 0)
+ throw new SocketException(11001);
+
+ he.AddressList = addrlist.ToArray(typeof(IPAddress)) as IPAddress[];
+ return he;
}
-
- public static IPHostEntry GetHostByAddress(IPAddress address) {
+
+ public static IPHostEntry GetHostByAddress(IPAddress address) \r
+ {
if (address == null)
throw new ArgumentNullException();
- return GetHostByAddress (IPAddress.HostToNetworkOrder (address.Address));
+ return GetHostByAddress (address.ToString());
}
-
- public static IPHostEntry GetHostByAddress(string address) {
+\r
+ public static IPHostEntry GetHostByAddress(string address) \r
+ {
if (address == null)
throw new ArgumentNullException();
- return GetHostByAddress(CreateAddress(address));
+
+ // 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));
}
-
- [DllImport("cygwin1", EntryPoint="gethostbyname")]
- private static extern IntPtr _GetHostByName(string hostName);
- [MonoTODO]
- public static IPHostEntry GetHostByName(string hostName) {
+ public static IPHostEntry GetHostByName(string hostName) \r
+ {
if (hostName == null)
throw new ArgumentNullException();
- IntPtr p = _GetHostByName(hostName);
- // int errNo = _h_errno;
- if (p == IntPtr.Zero)
- throw new SocketException(); // TODO: set error code
- Hostent h = new Hostent();
- System.Runtime.InteropServices.Marshal.PtrToStructure(p, h);
- return ToIPHostEntry(h);
+
+ 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;
+ 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 resovles a DNS-style host name or IP
+ /// 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) {
+ public static IPHostEntry Resolve(string hostName) \r
+ {
if (hostName == null)
throw new ArgumentNullException();
- try {
- long addr = CreateAddress(hostName);
- if (addr > uint.MaxValue)
- throw new FormatException("Only IP version 4 addresses are supported");
- return GetHostByAddress(addr);
- } catch (FormatException) {
- return GetHostByName(hostName);
- }
- }
-
- /// <summary>
- /// Utility method. This method converts a Hostent instance to a
- /// IPHostEntry instance.
- /// </summary>
- /// <param name=h>
- /// Object which should be mapped to a IPHostEntry instance.
- /// </param>
- private static unsafe IPHostEntry ToIPHostEntry(Hostent h) {
- IPHostEntry res = new IPHostEntry();
-
- // Set host name
- res.HostName = h.h_name;
-
- // Set IP address list
- byte** p = h.h_addr_list;
- ArrayList tmp = new ArrayList(1);
- while (*p != null) {
- tmp.Add(CreateIPAddress(*p, h.h_length));
- ++p;
- }
- IPAddress[] addr_list = new IPAddress[tmp.Count];
- for(int i = 0; i < tmp.Count; ++i)
- addr_list[i] = (IPAddress)tmp[i];
- res.AddressList = addr_list;
-
- // Set IP aliases
- p = h.h_aliases;
- tmp.Clear();
- while (*p != null) {
- tmp.Add(new string((sbyte*)*p));
- ++p;
- }
- string[] aliases = new string[tmp.Count];
- for(int i = 0; i < tmp.Count; ++i)
- aliases[i] = (string)tmp[i];
- res.Aliases = aliases;
-
- return res;
- }
-
- /// <summary>
- /// Utility method. Convert IP address in dotted notation
- /// to IP address.
- /// </summary>
- private static long CreateAddress(string address) {
- string[] tokens = address.Split('.');
- if (tokens.Length % 4 != 0)
- throw new FormatException("IP address has invalid length");
- long addr = 0;
- for(int i = 0, j = tokens.Length - 1; i < tokens.Length; ++i, --j) {
- try {
- addr = addr | (((long)byte.Parse(tokens[i])) << j * 8);
- } catch (OverflowException) {
- throw new FormatException("Invalid IP address format");
- }
- }
- return addr;
- }
-
- /// <summary>
- /// Utility method. This method creates a IP address.
- /// </summary>
- /// <param name=addr>
- /// IP address in network byte order (e.g. Big-Endian).
- /// </param>
- /// <param name=length>
- /// Length of IP address (4 or 8 bytes).
- /// </param>
- private static unsafe IPAddress CreateIPAddress(byte* addr, short length) {
- byte* p = addr;
- long res = 0;
- for(int i = 0, j = length - 1; i < length; ++i, --j) {
- res += *p << j * 8;
- ++p;
+
+ IPHostEntry ret = null;
+
+ try {\r
+ ret = GetHostByAddress(hostName);\r
}
- if (res > uint.MaxValue)
- return new IPAddress(IPAddress.NetworkToHostOrder((long)res));
- else
- return new IPAddress(IPAddress.NetworkToHostOrder((int)res));
+ catch{}
+
+ if(ret == null)\r
+ ret = GetHostByName(hostName);\r
+
+ return ret;
}
}
}
projects / mono.git / blobdiff