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Add support for Minecraft Service DNS Records

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- Add DnDns library for performing DNS queries
 - Add query method for SRV record
 - Resolve Minecraft services

This allows resolving actual server addresses for
servers using SRV records on their domain names

SRV records are basically DNS redirection eg:

  myserver.net -> srv1.myserver.net:12345

Should solve #186 reported by sammyvsparks and many others.
This commit is contained in:
ORelio 2016-10-06 19:13:58 +02:00
parent 69542872d0
commit 9cd983c50d
44 changed files with 5062 additions and 25 deletions
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95
MinecraftClient/Protocol/Dns/Records/SrvRecord.cs Normal file
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/**********************************************************************
* Copyright (c) 2010, j. montgomery *
* All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* *
* + Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* *
* + Redistributions in binary form must reproduce the above copyright*
* notice, this list of conditions and the following disclaimer *
* in the documentation and/or other materials provided with the *
* distribution. *
* *
* + Neither the name of j. montgomery's employer nor the names of *
* its contributors may be used to endorse or promote products *
* derived from this software without specific prior written *
* permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS*
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT *
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS *
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE *
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,*
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES *
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR *
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) *
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,*
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED*
* OF THE POSSIBILITY OF SUCH DAMAGE. *
**********************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net;
namespace DnDns.Records
{
public sealed class SrvRecord : DnsRecordBase
{
// For SRV
private ushort _priority;
private ushort _weight;
private ushort _port;
private string _hostName;
public ushort Priority
{
get { return _priority; }
}
public ushort Weight
{
get { return _weight; }
}
public ushort Port
{
get { return _port; }
}
public string HostName
{
get { return _hostName; }
}
internal SrvRecord(RecordHeader dnsHeader) : base(dnsHeader) { }
public override void ParseRecord(ref MemoryStream ms)
{
byte[] priority = new byte[2];
ms.Read(priority, 0, 2);
//_priority = (ushort)Tools.ByteToUInt(Priority);
_priority = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(priority, 0));
byte[] weight = new byte[2];
ms.Read(weight, 0, 2);
// _weight = (ushort)Tools.ByteToUInt(Weight);
_weight = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(weight, 0));
byte[] port = new byte[2];
ms.Read(port, 0, 2);
//_port = (ushort)Tools.ByteToUInt(port);
_port = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(port, 0));
_hostName = DnsRecordBase.ParseName(ref ms);
_answer = "Service Location: \r\nPriority: " + _priority + "\r\nWeight: " +
_weight + "\r\nPort: " + _port + "\r\nHostName: " + _hostName + "\r\n";
}
}
}