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 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);
}
