// 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{
#if NET_2_0
public static class Dns {
#else
public sealed class Dns {
private Dns () {}
#endif
static Dns ()
{
System.Net.Sockets.Socket.CheckProtocolSupport();
}
#if !MOONLIGHT // global remove of async methods
private delegate IPHostEntry GetHostByNameCallback (string hostName);
private delegate IPHostEntry ResolveCallback (string hostName);
#if NET_2_0
private delegate IPHostEntry GetHostEntryNameCallback (string hostName);
private delegate IPHostEntry GetHostEntryIPCallback (IPAddress hostAddress);
private delegate IPAddress [] GetHostAddressesCallback (string hostName);
#endif
#if NET_2_0
[Obsolete ("Use BeginGetHostEntry instead")]
#endif
public static IAsyncResult BeginGetHostByName (string hostName,
AsyncCallback requestCallback, object stateObject)
{
if (hostName == null)
throw new ArgumentNullException ("hostName");
GetHostByNameCallback c = new GetHostByNameCallback (GetHostByName);
return c.BeginInvoke (hostName, requestCallback, stateObject);
}
#if NET_2_0
[Obsolete ("Use BeginGetHostEntry instead")]
#endif
public static IAsyncResult BeginResolve (string hostName,
AsyncCallback requestCallback, object stateObject)
{
if (hostName == null)
throw new ArgumentNullException ("hostName");
ResolveCallback c = new ResolveCallback (Resolve);
return c.BeginInvoke (hostName, requestCallback, stateObject);
}
#if NET_2_0
public static IAsyncResult BeginGetHostAddresses (string hostNameOrAddress,
AsyncCallback requestCallback, object stateObject)
{
if (hostNameOrAddress == null)
throw new ArgumentNullException ("hostName");
if (hostNameOrAddress == "0.0.0.0" || hostNameOrAddress == "::0")
throw new ArgumentException ("Addresses 0.0.0.0 (IPv4) " +
"and ::0 (IPv6) are unspecified addresses. You " +
"cannot use them as target address.",
"hostNameOrAddress");
GetHostAddressesCallback c = new GetHostAddressesCallback (GetHostAddresses);
return c.BeginInvoke (hostNameOrAddress, requestCallback, stateObject);
}
public static IAsyncResult BeginGetHostEntry (string hostNameOrAddress,
AsyncCallback requestCallback, object stateObject)
{
if (hostNameOrAddress == null)
throw new ArgumentNullException ("hostName");
if (hostNameOrAddress == "0.0.0.0" || hostNameOrAddress == "::0")
throw new ArgumentException ("Addresses 0.0.0.0 (IPv4) " +
"and ::0 (IPv6) are unspecified addresses. You " +
"cannot use them as target address.",
"hostNameOrAddress");
GetHostEntryNameCallback c = new GetHostEntryNameCallback (GetHostEntry);
return c.BeginInvoke (hostNameOrAddress, requestCallback, stateObject);
}
public static IAsyncResult BeginGetHostEntry (IPAddress address,
AsyncCallback requestCallback, object stateObject)
{
if (address == null)
throw new ArgumentNullException ("address");
GetHostEntryIPCallback c = new GetHostEntryIPCallback (GetHostEntry);
return c.BeginInvoke (address, requestCallback, stateObject);
}
#endif
#if NET_2_0
[Obsolete ("Use EndGetHostEntry instead")]
#endif
public static IPHostEntry EndGetHostByName (IAsyncResult asyncResult)
{
if (asyncResult == null)
throw new ArgumentNullException ("asyncResult");
AsyncResult async = (AsyncResult) asyncResult;
GetHostByNameCallback cb = (GetHostByNameCallback) async.AsyncDelegate;
return cb.EndInvoke(asyncResult);
}
#if NET_2_0
[Obsolete ("Use EndGetHostEntry instead")]
#endif
public static IPHostEntry EndResolve (IAsyncResult asyncResult)
{
if (asyncResult == null)
throw new ArgumentNullException ("asyncResult");
AsyncResult async = (AsyncResult) asyncResult;
ResolveCallback cb = (ResolveCallback) async.AsyncDelegate;
return cb.EndInvoke(asyncResult);
}
#if NET_2_0
public static IPAddress [] EndGetHostAddresses (IAsyncResult asyncResult)
{
if (asyncResult == null)
throw new ArgumentNullException ("asyncResult");
AsyncResult async = (AsyncResult) asyncResult;
GetHostAddressesCallback cb = (GetHostAddressesCallback) async.AsyncDelegate;
return cb.EndInvoke(asyncResult);
}
public static IPHostEntry EndGetHostEntry (IAsyncResult asyncResult)
{
if (asyncResult == null)
throw new ArgumentNullException ("asyncResult");
AsyncResult async = (AsyncResult) asyncResult;
#if NET_2_0
if (async.AsyncDelegate is GetHostEntryIPCallback)
return ((GetHostEntryIPCallback) async.AsyncDelegate).EndInvoke (asyncResult);
#endif
GetHostEntryNameCallback cb = (GetHostEntryNameCallback) async.AsyncDelegate;
return cb.EndInvoke(asyncResult);
}
#endif
#endif // !MOONLIGHT: global remove of async methods
#if !TARGET_JVM
[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);
#endif
private static IPHostEntry hostent_to_IPHostEntry(string h_name, string[] h_aliases, string[] h_addrlist)
{
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++) {
try {
IPAddress newAddress = IPAddress.Parse(h_addrlist[i]);
if( (Socket.SupportsIPv6 && newAddress.AddressFamily == AddressFamily.InterNetworkV6) ||
(Socket.SupportsIPv4 && newAddress.AddressFamily == AddressFamily.InterNetwork) )
addrlist.Add(newAddress);
} catch (ArgumentNullException) {
/* Ignore this, as the
* internal call might have
* left some blank entries at
* the end of the array
*/
}
}
if(addrlist.Count == 0)
throw new SocketException(11001);
he.AddressList = addrlist.ToArray(typeof(IPAddress)) as IPAddress[];
return he;
}
#if NET_2_0
[Obsolete ("Use GetHostEntry instead")]
#endif
public static IPHostEntry GetHostByAddress(IPAddress address)
{
if (address == null)
throw new ArgumentNullException ("address");
return GetHostByAddressFromString (address.ToString (), false);
}
#if NET_2_0
[Obsolete ("Use GetHostEntry instead")]
#endif
public static IPHostEntry GetHostByAddress(string address)
{
if (address == null)
throw new ArgumentNullException ("address");
return GetHostByAddressFromString (address, true);
}
static IPHostEntry GetHostByAddressFromString (string address, bool parse)
{
// Undocumented MS behavior: when called with IF_ANY,
// this should return the local host
if (address.Equals ("0.0.0.0")) {
address = "127.0.0.1";
parse = false;
}
// Must check the IP format, might send an exception if invalid string.
if (parse)
IPAddress.Parse (address);
string h_name;
string[] h_aliases, h_addrlist;
#if TARGET_JVM
h_name = null;
h_aliases = null;
h_addrlist = null;
try {
java.net.InetAddress[] iaArr =
java.net.InetAddress.getAllByName(address);
if (iaArr != null && iaArr.Length > 0)
h_name = iaArr[0].getHostName();
if (iaArr != null && iaArr.Length > 0)
{
h_addrlist = new String[iaArr.Length];
for (int i = 0; i < h_addrlist.Length; i++)
h_addrlist[i] = iaArr[i].getHostAddress();
}
} catch (java.net.UnknownHostException jUHE) {
throw new SocketException((int)SocketError.HostNotFound, jUHE.Message);
}
#else
bool ret = GetHostByAddr_internal(address, out h_name, out h_aliases, out h_addrlist);
if (!ret)
throw new SocketException(11001);
#endif
return (hostent_to_IPHostEntry (h_name, h_aliases, h_addrlist));
}
#if NET_2_0
public
#else
internal
#endif
static IPHostEntry GetHostEntry (string hostNameOrAddress)
{
if (hostNameOrAddress == null)
throw new ArgumentNullException ("hostNameOrAddress");
if (hostNameOrAddress == "0.0.0.0" || hostNameOrAddress == "::0")
throw new ArgumentException ("Addresses 0.0.0.0 (IPv4) " +
"and ::0 (IPv6) are unspecified addresses. You " +
"cannot use them as target address.",
"hostNameOrAddress");
IPAddress addr;
if (hostNameOrAddress.Length > 0 && IPAddress.TryParse (hostNameOrAddress, out addr))
return GetHostEntry (addr);
return GetHostByName (hostNameOrAddress);
}
#if NET_2_0
public
#else
internal
#endif
static IPHostEntry GetHostEntry (IPAddress address)
{
if (address == null)
throw new ArgumentNullException ("address");
return GetHostByAddressFromString (address.ToString (), false);
}
#if NET_2_0
public
#else
internal
#endif
static IPAddress [] GetHostAddresses (string hostNameOrAddress)
{
if (hostNameOrAddress == null)
throw new ArgumentNullException ("hostNameOrAddress");
if (hostNameOrAddress == "0.0.0.0" || hostNameOrAddress == "::0")
throw new ArgumentException ("Addresses 0.0.0.0 (IPv4) " +
"and ::0 (IPv6) are unspecified addresses. You " +
"cannot use them as target address.",
"hostNameOrAddress");
IPAddress addr;
if (hostNameOrAddress.Length > 0 && IPAddress.TryParse (hostNameOrAddress, out addr))
return new IPAddress[1] { addr };
return GetHostEntry (hostNameOrAddress).AddressList;
}
#if NET_2_0
[Obsolete ("Use GetHostEntry instead")]
#endif
public static IPHostEntry GetHostByName (string hostName)
{
if (hostName == null)
throw new ArgumentNullException ("hostName");
#if TARGET_JVM
if (hostName.Length == 0)
hostName = "localhost";
try {
java.net.InetAddress[] iaArr = java.net.InetAddress.getAllByName(hostName);
IPHostEntry host = new IPHostEntry();
if (iaArr != null && iaArr.Length > 0)
{
host.HostName = iaArr[0].getHostName();
IPAddress[] ipArr = new IPAddress[iaArr.Length];
for (int i = 0; i < iaArr.Length; i++)
ipArr[i] = IPAddress.Parse(iaArr[i].getHostAddress());
host.AddressList = ipArr;
}
return host;
} catch (java.net.UnknownHostException jUHE) {
throw new SocketException((int)SocketError.HostNotFound, jUHE.Message);
}
#else
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));
#endif
}
public static string GetHostName ()
{
#if TARGET_JVM
return java.net.InetAddress.getLocalHost ().getHostName ();
#else
string hostName;
bool ret = GetHostName_internal(out hostName);
if (ret == false)
throw new SocketException(11001);
return hostName;
#endif
}
#if NET_2_0
[Obsolete ("Use GetHostEntry instead")]
#endif
public static IPHostEntry Resolve(string hostName)
{
if (hostName == null)
throw new ArgumentNullException ("hostName");
IPHostEntry ret = null;
try {
ret = GetHostByAddress(hostName);
}
catch{}
if(ret == null)
ret = GetHostByName(hostName);
return ret;
}
}
}
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