mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-11-15 17:22:12 +00:00
362 lines
14 KiB
C#
362 lines
14 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Text;
|
|
using System.Net;
|
|
using System.Net.Sockets;
|
|
using System.IO;
|
|
|
|
namespace SRB2Updater
|
|
{
|
|
class ServerQuerier
|
|
{
|
|
private UdpClient udpclient;
|
|
private IPEndPoint ipepMS;
|
|
|
|
private const int MS_HOLEPUNCH_SIZE = 0;
|
|
private const int PT_ASKINFO_SIZE = 16;
|
|
private const byte PT_ASKINFO = 12;
|
|
private const byte PT_SERVERINFO = 13;
|
|
private const int MAXSERVERNAME = 32;
|
|
private const int MAX_WADPATH = 128;
|
|
|
|
/// <summary>
|
|
/// Constructs a ServerQuerier object.
|
|
/// </summary>
|
|
public ServerQuerier()
|
|
{
|
|
udpclient = new UdpClient(0, AddressFamily.InterNetwork);
|
|
|
|
// Fix for WSAECONNRESET. Only affects Win2k and up. If I send a
|
|
// packet to a host which replies with an ICMP Port Unreachable,
|
|
// subsequent socket operations go doo-lally. So, we enable the
|
|
// older behaviour of ignoring these ICMP messages, since we don't
|
|
// care about them anyway.
|
|
if (Environment.OSVersion.Platform == PlatformID.Win32NT &&
|
|
Environment.OSVersion.Version.Major >= 5)
|
|
{
|
|
const uint IOC_IN = 0x80000000;
|
|
const uint IOC_VENDOR = 0x18000000;
|
|
const uint SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 12;
|
|
|
|
udpclient.Client.IOControl(unchecked((int)SIO_UDP_CONNRESET), new byte[] { Convert.ToByte(false) }, null);
|
|
}
|
|
}
|
|
|
|
public void StartListening(ServerInfoReceiveHandler sirh)
|
|
{
|
|
// Start listening.
|
|
udpclient.BeginReceive(new AsyncCallback(ServerInfoReceiveHandler.Receive), sirh);
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
/// Sets the master server address. Necessary before querying via the MS.
|
|
/// </summary>
|
|
/// <param name="strAddress">IP address of hostname of MS.</param>
|
|
/// <param name="unPort">Port of MS.</param>
|
|
public void SetMasterServer(string strAddress, ushort unPort)
|
|
{
|
|
IPAddress address = Dns.GetHostEntry(strAddress).AddressList[0];
|
|
ipepMS = new IPEndPoint(address, unPort);
|
|
}
|
|
|
|
public void Query(string strAddress, ushort unPort)
|
|
{
|
|
// Build the packet.
|
|
byte[] byPacket = new byte[PT_ASKINFO_SIZE];
|
|
BinaryWriter bw = new BinaryWriter(new MemoryStream(byPacket));
|
|
|
|
bw.Seek(4, SeekOrigin.Begin); // Skip the checksum.
|
|
bw.Write((byte)0); // ack
|
|
bw.Write((byte)0); // ackreturn
|
|
bw.Write((byte)PT_ASKINFO); // Packet type.
|
|
bw.Write((byte)0); // Reserved.
|
|
bw.Write((byte)0); // Version. This is actually unnecessary -- the client will reply anyway. -MattW_CFI
|
|
bw.Write((byte)0); // Reserved.
|
|
bw.Write((byte)0); // Reserved.
|
|
bw.Write((byte)0); // Reserved.
|
|
// Time for ping calculation.
|
|
bw.Write(unchecked((uint)(DateTime.Now.Ticks / 10000)));
|
|
|
|
// Calculate the checksum.
|
|
bw.Seek(0, SeekOrigin.Begin);
|
|
bw.Write(SRB2Checksum(byPacket));
|
|
|
|
// Send the packet.
|
|
udpclient.Send(byPacket, byPacket.Length, strAddress, unPort);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Calculates the checksum of an SRB2 packet.
|
|
/// </summary>
|
|
/// <param name="byPacket">Packet.</param>
|
|
/// <returns>Checksum.</returns>
|
|
private static uint SRB2Checksum(byte[] byPacket)
|
|
{
|
|
uint c = 0x1234567;
|
|
int i;
|
|
|
|
for (i = 4; i < byPacket.Length; i++)
|
|
unchecked
|
|
{
|
|
c += (uint)byPacket[i] * (uint)(i - 3);
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
private static string ReadFixedLengthStr(BinaryReader br, int iLen)
|
|
{
|
|
String str = Encoding.ASCII.GetString(br.ReadBytes(iLen));
|
|
int iPos = str.IndexOf("\0");
|
|
if (iPos >= 0)
|
|
str = str.Remove(iPos);
|
|
|
|
return str;
|
|
}
|
|
|
|
public abstract class ServerInfoReceiveHandler
|
|
{
|
|
UdpClient udpclient;
|
|
IPEndPoint ipepRemote;
|
|
|
|
/// <summary>
|
|
/// Called after a server info packet is received.
|
|
/// </summary>
|
|
/// <param name="srb2si">Server info.</param>
|
|
public abstract void ProcessServerInfo(SRB2ServerInfo srb2si);
|
|
public abstract void HandleException(Exception e);
|
|
|
|
public ServerInfoReceiveHandler(ServerQuerier sq)
|
|
{
|
|
ipepRemote = new IPEndPoint(IPAddress.Any, 0);
|
|
|
|
udpclient = sq.udpclient;
|
|
}
|
|
|
|
public static void Receive(IAsyncResult ar)
|
|
{
|
|
ServerInfoReceiveHandler sirh = (ServerInfoReceiveHandler)ar.AsyncState;
|
|
|
|
byte[] byPacket = sirh.udpclient.EndReceive(ar, ref sirh.ipepRemote);
|
|
|
|
// Analyse the packet.
|
|
BinaryReader br = new BinaryReader(new MemoryStream(byPacket));
|
|
|
|
// Get the checksum.
|
|
uint uiChecksum = br.ReadUInt32();
|
|
|
|
// Skip ack and ackreturn and get packet type.
|
|
br.ReadBytes(2);
|
|
byte byPacketType = br.ReadByte();
|
|
|
|
// Only interested in valid PT_SERVERINFO packets.
|
|
if (byPacketType == PT_SERVERINFO && uiChecksum == SRB2Checksum(byPacket))
|
|
{
|
|
bool bMalformed = true;
|
|
|
|
// Skip padding.
|
|
br.ReadByte();
|
|
|
|
// Remember where we are.
|
|
long iPacketStart = br.BaseStream.Position;
|
|
|
|
// Try to interpret the packet in each recognised format.
|
|
foreach (ServerInfoVer siv in Enum.GetValues(typeof(ServerInfoVer)))
|
|
{
|
|
SRB2ServerInfo srb2si;
|
|
byte byNumWads = 0;
|
|
|
|
srb2si.siv = siv;
|
|
|
|
br.BaseStream.Position = iPacketStart;
|
|
|
|
// Get address from socket.
|
|
srb2si.strAddress = sirh.ipepRemote.Address.ToString();
|
|
srb2si.unPort = unchecked((ushort)sirh.ipepRemote.Port);
|
|
|
|
// Get version.
|
|
byte byVersion = br.ReadByte();
|
|
|
|
if (siv == ServerInfoVer.SIV_PREME)
|
|
{
|
|
br.ReadBytes(3);
|
|
|
|
uint uiSubVersion = br.ReadUInt32();
|
|
|
|
// Format version.
|
|
// MattW_CFI: I hope you don't mind this exception, Oogaland, but 0.01.6 looks odd >_>
|
|
if (byVersion == 1 && uiSubVersion == 6)
|
|
srb2si.strVersion = "X.01.6";
|
|
else
|
|
srb2si.strVersion = byVersion.ToString();
|
|
//srb2si.strVersion = String.Format("{0}.{1:00}.{2}", byVersion / 100, byVersion % 100, uiSubVersion);
|
|
}
|
|
else
|
|
{
|
|
byte bySubVersion = br.ReadByte();
|
|
|
|
// Format version.
|
|
//srb2si.strVersion = String.Format("{0}.{1:00}.{2}", byVersion / 100, byVersion % 100, bySubVersion);
|
|
srb2si.strVersion = byVersion.ToString();
|
|
}
|
|
|
|
srb2si.byPlayers = br.ReadByte();
|
|
srb2si.byMaxplayers = br.ReadByte();
|
|
srb2si.byGametype = br.ReadByte();
|
|
srb2si.bModified = (br.ReadByte() != 0);
|
|
|
|
if (siv == ServerInfoVer.SIV_ME)
|
|
byNumWads = br.ReadByte();
|
|
|
|
srb2si.sbyAdminplayer = br.ReadSByte();
|
|
|
|
if (siv == ServerInfoVer.SIV_PREME)
|
|
br.ReadBytes(3);
|
|
|
|
// Calculate ping.
|
|
srb2si.uiTime = unchecked((uint)((long)(DateTime.Now.Ticks / 10000 - br.ReadUInt32()) % ((long)UInt32.MaxValue + 1)));
|
|
|
|
if (siv == ServerInfoVer.SIV_PREME)
|
|
br.ReadUInt32();
|
|
|
|
// Get and tidy map name.
|
|
if (siv == ServerInfoVer.SIV_PREME)
|
|
{
|
|
srb2si.strMapName = ReadFixedLengthStr(br, 8);
|
|
srb2si.strName = ReadFixedLengthStr(br, MAXSERVERNAME);
|
|
}
|
|
else
|
|
{
|
|
srb2si.strName = ReadFixedLengthStr(br, MAXSERVERNAME);
|
|
srb2si.strMapName = ReadFixedLengthStr(br, 8);
|
|
}
|
|
|
|
if (siv == ServerInfoVer.SIV_PREME)
|
|
byNumWads = br.ReadByte();
|
|
|
|
// Create new list of strings of initial size equal to number of wads.
|
|
srb2si.listFiles = new List<AddedWad>(byNumWads);
|
|
|
|
// Get the files info.
|
|
byte[] byFiles = br.ReadBytes(siv == ServerInfoVer.SIV_PREME ? 4096 : 936);
|
|
BinaryReader brFiles = new BinaryReader(new MemoryStream(byFiles));
|
|
|
|
// Extract the filenames.
|
|
try
|
|
{
|
|
for (int i = 0; i < byNumWads; i++)
|
|
{
|
|
bool bFullString = false;
|
|
AddedWad aw = new AddedWad();
|
|
|
|
if (siv == ServerInfoVer.SIV_PREME)
|
|
{
|
|
aw.bImportant = brFiles.ReadByte() != 0;
|
|
aw.downloadtype = (DownloadTypes)brFiles.ReadByte();
|
|
}
|
|
else
|
|
{
|
|
byte byFileStatus = brFiles.ReadByte();
|
|
aw.bImportant = (byFileStatus & 0xF) != 0;
|
|
aw.downloadtype = (DownloadTypes)(byFileStatus >> 4);
|
|
}
|
|
|
|
aw.uiSize = brFiles.ReadUInt32();
|
|
|
|
// Work out how long the string is.
|
|
int iStringPos = (int)brFiles.BaseStream.Position;
|
|
while (iStringPos < byFiles.Length && byFiles[iStringPos] != 0) iStringPos++;
|
|
|
|
// Make sure it's not longer than the max name length.
|
|
if (iStringPos - (int)brFiles.BaseStream.Position > MAX_WADPATH)
|
|
{
|
|
bFullString = true;
|
|
iStringPos = MAX_WADPATH + (int)brFiles.BaseStream.Position;
|
|
}
|
|
|
|
// Get the info and add it, if possible.
|
|
if (iStringPos > (int)brFiles.BaseStream.Position)
|
|
{
|
|
aw.strFilename = Encoding.ASCII.GetString(brFiles.ReadBytes(iStringPos - (int)brFiles.BaseStream.Position));
|
|
srb2si.listFiles.Add(aw);
|
|
}
|
|
|
|
// Skip nul.
|
|
if (!bFullString) brFiles.ReadByte();
|
|
|
|
// Skip the md5sum.
|
|
brFiles.ReadBytes(16);
|
|
}
|
|
|
|
// Okay, done! Do something useful with the server info.
|
|
sirh.ProcessServerInfo(srb2si);
|
|
|
|
// If we got this far without an exception, leave the foreach loop.
|
|
bMalformed = false;
|
|
break;
|
|
}
|
|
catch (EndOfStreamException)
|
|
{
|
|
// Packet doesn't match supposed type, so we swallow the exception
|
|
// and try remaining types.
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
sirh.HandleException(e);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (bMalformed)
|
|
sirh.HandleException(new Exception("Received invalid PT_SERVERINFO packet from " + sirh.ipepRemote.Address + ":" + sirh.ipepRemote.Port + "."));
|
|
}
|
|
|
|
// Resume listening.
|
|
sirh.ipepRemote = new IPEndPoint(IPAddress.Any, 0);
|
|
sirh.udpclient.BeginReceive(new AsyncCallback(Receive), sirh);
|
|
}
|
|
}
|
|
|
|
public enum DownloadTypes
|
|
{
|
|
DT_TOOBIG = 0,
|
|
DT_OK = 1,
|
|
DT_DISABLED = 2
|
|
}
|
|
|
|
public struct AddedWad
|
|
{
|
|
public string strFilename;
|
|
public bool bImportant;
|
|
public uint uiSize;
|
|
public DownloadTypes downloadtype;
|
|
}
|
|
|
|
public enum ServerInfoVer
|
|
{
|
|
SIV_PREME,
|
|
SIV_ME
|
|
};
|
|
|
|
public struct SRB2ServerInfo
|
|
{
|
|
public string strAddress;
|
|
public ushort unPort;
|
|
|
|
public ServerInfoVer siv;
|
|
|
|
public string strVersion;
|
|
public byte byPlayers;
|
|
public byte byMaxplayers;
|
|
public byte byGametype;
|
|
public bool bModified;
|
|
public sbyte sbyAdminplayer;
|
|
public uint uiTime;
|
|
public string strMapName;
|
|
public string strName;
|
|
|
|
public List<AddedWad> listFiles;
|
|
}
|
|
}
|
|
}
|