/// <summary>
/// This method parses and handles a module load notify message from a
/// game server.
/// </summary>
/// <param name="Parser">Supplies the message parse context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstModuleLoadNotify(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
Byte ExpansionsMask;
string ModuleName;
if (!Parser.ReadBYTE(out ExpansionsMask))
return;
if (!Parser.ReadSmallString(out ModuleName, 16))
return;
//
// Query for whether the sender is blacklisted and drop the message
// if so.
//
BlacklistLookup Lookup = new BlacklistLookup();
Lookup.ServerAddress = Sender;
Lookup.ModuleName = ModuleName;
if (ServerTracker.IsBlacklisted(Lookup))
return;
NWGameServer Server = ServerTracker.LookupServerByAddress(Sender);
//
// Record the module load and request an updated player count.
//
Server.OnModuleLoad(ExpansionsMask, ModuleName);
RefreshServerStatus(Sender);
Logger.Log(LogLevel.Verbose, "NWMasterServer.OnRecvMstModuleLoadNotify(): Server {0} ModuleName={1} ExpansionsMask={2}.", Sender, ModuleName, ExpansionsMask);
}
/// <summary>
/// This method parses and handles a MOTD request from a game server or
/// game client.
/// </summary>
/// <param name="Parser">Supplies the message parse context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstMOTDRequest(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 DataPort;
Byte Unknown0; // 0
Byte Unknown1; // 0
if (!Parser.ReadWORD(out DataPort))
return;
if (!Parser.ReadBYTE(out Unknown0))
return;
if (!Parser.ReadBYTE(out Unknown1))
return;
SendMstMOTD(Sender, MOTD);
}
/// <summary>
/// This method parses and handles a player disconnect notify message
/// from a game server.
/// </summary>
/// <param name="Parser">Supplies the message parse context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstDisconnectNotify(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 DataPort;
UInt16 EntryCount;
UInt16 CDKeyCount;
List<string> CDKeyList;
NWGameServer Server;
if (!Parser.ReadWORD(out DataPort))
return;
if (!Parser.ReadWORD(out EntryCount))
return;
if (EntryCount == 0)
{
//
// Server shutdown.
//
Server = ServerTracker.LookupServerByAddress(Sender, false);
if (Server == null || Server.Online == false)
return;
//
// Record the server shutdown.
//
Server.OnShutdownNotify();
Logger.Log(LogLevel.Normal, "NWMasterServer.OnRecvMstShutdownNotify(): Server {0} shut down.", Sender);
return;
}
else if (EntryCount != 1)
{
return;
}
if (!Parser.ReadWORD(out CDKeyCount))
return;
CDKeyList = new List<string>();
while (CDKeyCount-- != 0)
{
string CDKey;
if (!Parser.ReadSmallString(out CDKey, 16))
return;
CDKeyList.Add(CDKey);
}
Logger.Log(LogLevel.Verbose, "NWMasterServer.OnRecvMstDisconnectNotify()");
}
/// <summary>
/// This method parses and handles a server startup notify message from
/// a game server.
/// </summary>
/// <param name="Parser">Supplies the message parse context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstStartupNotify(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
Byte Platform;
UInt16 BuildNumber;
Byte Unknown0; // 0
Byte Unknown1; // 0
Byte Unknown2; // 1
Byte Unknown3; // 0
Byte Unknown4; // 3
if (!Parser.ReadBYTE(out Platform))
return;
if (!Parser.ReadWORD(out BuildNumber))
return;
if (!Parser.ReadBYTE(out Unknown0))
return;
if (!Parser.ReadBYTE(out Unknown1))
return;
if (!Parser.ReadBYTE(out Unknown2))
return;
if (!Parser.ReadBYTE(out Unknown3))
return;
if (!Parser.ReadBYTE(out Unknown4))
return;
//
// Query for whether the sender is blacklisted and drop the message
// if so.
//
BlacklistLookup Lookup = new BlacklistLookup();
Lookup.ServerAddress = Sender;
if (ServerTracker.IsBlacklisted(Lookup))
return;
NWGameServer Server = ServerTracker.LookupServerByAddress(Sender);
//
// Record the server startup.
//
Server.OnStartupNotify(Platform, BuildNumber);
Logger.Log(LogLevel.Verbose, "NWMasterServer.OnRecvMstStartupNotify(): Server {0} Platform={1} BuildNumber={2}.", Sender, (char)Platform, BuildNumber);
}
/// <summary>
/// This method parses and handles a CD-Key authorization request from
/// from a game server.
/// </summary>
/// <param name="Parser">Supplies the message parse context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstCDKeyAuthorizationRequest(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 DataPort;
UInt16 EntryCount;
UInt32 ClientIP;
UInt16 ClientPort;
byte[] ServerChallenge;
UInt16 Length;
List<CDKeyInfo> CDKeyHashes;
CDKeyInfo CDKeyHash;
string AccountName;
int KeyIndex;
int PortNumberHbo;
if (!Parser.ReadWORD(out DataPort))
return;
if (!Parser.ReadWORD(out EntryCount))
return;
if (EntryCount != 1)
return;
if (!Parser.ReadDWORD(out ClientIP))
return;
if (!Parser.ReadWORD(out ClientPort))
return;
PortNumberHbo = IPAddress.NetworkToHostOrder(ClientPort);
if ((PortNumberHbo == 0) || ((PortNumberHbo & 0xFFFF) != PortNumberHbo))
PortNumberHbo = 5120;
IPEndPoint ClientEndpoint = new IPEndPoint((long)ClientIP, PortNumberHbo);
if (!Parser.ReadWORD(out Length))
return;
if ((ServerChallenge = Parser.ReadBytes(Length)) == null)
return;
if (!Parser.ReadWORD(out Length))
return;
CDKeyHashes = new List<CDKeyInfo>();
CDKeyHash = new CDKeyInfo();
KeyIndex = 0;
while (Length-- != 0)
{
UInt16 HashLength;
if (!Parser.ReadSmallString(out CDKeyHash.PublicCDKey, 16))
return;
if (!Parser.ReadWORD(out HashLength))
return;
if ((CDKeyHash.CDKeyHash = Parser.ReadBytes(HashLength)) == null)
return;
//
// N.B. The following is somewhat of a hack in that we are not
// bothering to extract the (real) product type from the
// CD-Key. As a result, it is possible that the wrong
// answer could be provided for clients without all of
// the expansions; this situation is considered unlikely
// in the current state of affairs.
//
// A better fit could be had by examining the expansion
// mask required by the server in the data table, but
// this does not appear worthwhile at this stage.
//
if (KeyIndex == 0)
CDKeyHash.Product = 0;
else
CDKeyHash.Product = (UInt16) (1 << (KeyIndex - 1));
CDKeyHash.AuthStatus = (UInt16)ConnectStatus.CONNECT_ERR_SUCCESS;
CDKeyHashes.Add(CDKeyHash);
}
if (!Parser.ReadSmallString(out AccountName, 16))
return;
SendMstCDKeyAuthorization(Sender, CDKeyHashes);
}
/// <summary>
/// This method parses and handles a heartbeat message from a game
/// server.
/// </summary>
/// <param name="Parser">Supplies the message parse context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstHeartbeat(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 PlayerCount;
List<List<string>> PlayerCDKeyList = new List<List<string>>();
if (!Parser.ReadWORD(out PlayerCount))
return;
while (PlayerCount-- != 0)
{
UInt16 CDKeyCount;
List<string> CDKeyList = new List<string>();
if (!Parser.ReadWORD(out CDKeyCount))
return;
while (CDKeyCount-- != 0)
{
string CDKey;
if (!Parser.ReadSmallString(out CDKey, 16))
return;
CDKeyList.Add(CDKey);
}
PlayerCDKeyList.Add(CDKeyList);
}
Logger.Log(LogLevel.Verbose, "NWMasterServer.OnRecvMstHeartbeat(): Server {0} ActivePlayerCount={1}.", Sender, PlayerCDKeyList.Count);
}
/// <summary>
/// This method handles a received master server communication protocol
/// message. The message is examined and then dispatched to a handler.
/// </summary>
/// <param name="Cmd">Supplies the command code of the message.</param>
/// <param name="ParseBuffer">Supplies the message body.</param>
/// <param name="Sender">Supplies the reply address for the
/// sender.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstMessage(uint Cmd, ExoParseBuffer ParseBuffer, IPEndPoint Sender, SocketInfo Socket)
{
switch (Cmd)
{
case (uint)MstCmd.CommunityAuthorizationRequest:
OnRecvMstCommunityAuthorizationRequest(ParseBuffer, Sender, Socket);
break;
case (uint)MstCmd.CDKeyAuthorizationRequest:
OnRecvMstCDKeyAuthorizationRequest(ParseBuffer, Sender, Socket);
break;
case (uint)MstCmd.Heartbeat:
OnRecvMstHeartbeat(ParseBuffer, Sender, Socket);
break;
case (uint)MstCmd.DisconnectNotify:
OnRecvMstDisconnectNotify(ParseBuffer, Sender, Socket);
break;
case (uint)MstCmd.StartupNotify:
OnRecvMstStartupNotify(ParseBuffer, Sender, Socket);
break;
case (uint)MstCmd.ModuleLoadNotify:
OnRecvMstModuleLoadNotify(ParseBuffer, Sender, Socket);
break;
case (uint)MstCmd.MOTDRequest:
OnRecvMstMOTDRequest(ParseBuffer, Sender, Socket);
break;
case (uint)MstCmd.VersionRequest:
OnRecvMstVersionRequest(ParseBuffer, Sender, Socket);
break;
case (uint)MstCmd.StatusRequest:
OnRecvMstStatusRequest(ParseBuffer, Sender, Socket);
break;
case (uint)ConnAuthCmd.ServerInfoResponse:
OnRecvServerInfoResponse(ParseBuffer, Sender, Socket);
break;
case (uint)ConnAuthCmd.ServerNameResponse:
OnRecvServerNameResponse(ParseBuffer, Sender, Socket);
break;
case (uint)ConnAuthCmd.ServerDescriptionResponse:
OnRecvServerDescriptionResponse(ParseBuffer, Sender, Socket);
break;
}
}
/// <summary>
/// This method parses a server name response from a game server.
/// </summary>
/// <param name="Parser">Supplies the message parser context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvServerNameResponse(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
Byte UpdateType;
UInt16 DataPort;
Byte RequestCorrelationCookie;
string ServerName;
if (!Parser.ReadBYTE(out UpdateType))
return;
if (UpdateType != 'U')
return;
if (!Parser.ReadWORD(out DataPort))
return;
if (!Parser.ReadBYTE(out RequestCorrelationCookie))
return;
if (RequestCorrelationCookie != 0)
return;
if (!Parser.ReadSmallString(out ServerName))
return;
NWGameServer Server = ServerTracker.LookupServerByAddress(Sender, false);
if (Server != null)
Server.OnServerNameUpdate(ServerName);
Logger.Log(LogLevel.Verbose, "NWMasterServer.OnRecvServerNameResponse(): Server {0} name is {1}.", Sender, ServerName);
}
/// <summary>
/// This method handles a received datagram on the master server
/// socket. It examines the request and dispatches it as appropriate.
/// </summary>
/// <param name="Buffer">Supplies the received datagram.</param>
/// <param name="RecvLen">Supplies the length of the received
/// datagram.</param>
/// <param name="Sender">Supplies the datagram sender.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstDatagram(byte[] Buffer, int RecvLen, IPEndPoint Sender, SocketInfo Socket)
{
if (RecvLen < 4)
return;
unsafe
{
uint Cmd;
Cmd = ((uint)Buffer[0] << 0) |
((uint)Buffer[1] << 8) |
((uint)Buffer[2] << 16) |
((uint)Buffer[3] << 24);
fixed (void *ByteData = &Buffer[4])
{
ExoParseBuffer ParseBuffer;
using (ParseBuffer = new ExoParseBuffer(ByteData, (uint)RecvLen - 4, null, 0))
{
OnRecvMstMessage(Cmd, ParseBuffer, Sender, Socket);
}
}
}
}
/// <summary>
/// This method handles a received datagram on the GameSpy server
/// socket. It examines the request and dispatches it as appropriate.
/// </summary>
/// <param name="Buffer">Supplies the received datagram.</param>
/// <param name="RecvLen">Supplies the length of the received
/// datagram.</param>
/// <param name="Sender">Supplies the datagram sender.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvGameSpyDatagram(byte[] Buffer, int RecvLen, IPEndPoint Sender, SocketInfo Socket)
{
if (RecvLen < 1)
return;
unsafe
{
uint Cmd = (uint)Buffer[0];
fixed (void* ByteData = &Buffer[1])
{
ExoParseBuffer ParseBuffer;
using (ParseBuffer = new ExoParseBuffer(ByteData, (uint)RecvLen - 1, null, 0))
{
OnRecvGameSpyMessage(Cmd, ParseBuffer, Sender, Socket);
}
}
}
}
/// <summary>
/// This method parses a GameSpy check server status request from a
/// client.</summary>
/// <param name="Parser">Supplies the message parser context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvGameSpyCheckServerStatus(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
//
// The message contains:
// (DWORD) 0
// (STRING) ProductName "nwn2"
//
SendGameSpyCheckServerStatusResponse(Sender);
}
/// <summary>
/// This method handles a received GameSpy server communication
/// protocol message. The message is examined and then dispatched to
/// a handler.
/// </summary>
/// <param name="Cmd">Supplies the command code of the message.</param>
/// <param name="ParseBuffer">Supplies the message body.</param>
/// <param name="Sender">Supplies the reply address for the
/// sender.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvGameSpyMessage(uint Cmd, ExoParseBuffer ParseBuffer, IPEndPoint Sender, SocketInfo Socket)
{
switch (Cmd)
{
case (uint)GameSpyCmd.CheckServerStatus:
OnRecvGameSpyCheckServerStatus(ParseBuffer, Sender, Socket);
break;
}
}
/// <summary>
/// This method parses a server name response from a game server.
/// </summary>
/// <param name="Parser">Supplies the message parser context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvServerDescriptionResponse(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 DataPort;
string GameDetails;
string ModuleDescription;
string BuildNumber;
UInt16 GameType;
string ModuleUrl;
string PWCUrl;
UInt16 Build;
if (!Parser.ReadWORD(out DataPort))
return;
if (!Parser.ReadSmallString(out GameDetails, 32))
return;
if (!Parser.ReadSmallString(out ModuleDescription, 32))
return;
if (!Parser.ReadSmallString(out BuildNumber, 32))
return;
if (!Parser.ReadWORD(out GameType))
return;
if (Mode == GameMode.NWN2)
{
if (!Parser.ReadSmallString(out ModuleUrl, 32))
return;
if (!Parser.ReadSmallString(out PWCUrl, 32))
return;
}
else
{
ModuleUrl = "";
PWCUrl = "";
}
try
{
Build = Convert.ToUInt16(BuildNumber);
}
catch
{
Build = 0;
}
NWGameServer Server = ServerTracker.LookupServerByAddress(Sender, false);
if (Server != null)
Server.OnDescriptionInfoUpdate(ModuleDescription, ModuleUrl, GameType, PWCUrl, Build, GameDetails);
Logger.Log(LogLevel.Verbose, "NWMasterServer.OnRecvServerDescriptionResponse(): Server {0} description '{1}' URL '{2}' has game type {3}.",
Sender,
ModuleDescription,
ModuleUrl,
GameType);
}
/// <summary>
/// This method parses and handles a version request from a game server
/// or game client.
/// </summary>
/// <param name="Parser">Supplies the message parse context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstVersionRequest(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 DataPort;
Byte Unknown0; // 0
Byte Unknown1; // 0
Byte Unknown2; // 1
if (!Parser.ReadWORD(out DataPort))
return;
if (!Parser.ReadBYTE(out Unknown0))
return;
if (!Parser.ReadBYTE(out Unknown1))
return;
if (!Parser.ReadBYTE(out Unknown2))
return;
SendMstVersion(Sender, BuildNumber);
}
/// <summary>
/// This method parses and handles a community authorization request
/// from a game server.
/// </summary>
/// <param name="Parser">Supplies the message parse context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstCommunityAuthorizationRequest(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 DataPort;
UInt16 Length;
byte[] ServerChallenge;
string AccountName;
byte[] ClientVerifier;
UInt16 Language;
Byte Platform;
Byte IsPlayer;
if (!Parser.ReadWORD(out DataPort))
return;
if (!Parser.ReadWORD(out Length))
return;
if ((ServerChallenge = Parser.ReadBytes(Length)) == null)
return;
if (!Parser.ReadSmallString(out AccountName, 16))
return;
if (!Parser.ReadWORD(out Length))
return;
if ((ClientVerifier = Parser.ReadBytes(Length)) == null)
return;
if (!Parser.ReadWORD(out Language))
return;
if (!Parser.ReadBYTE(out Platform))
return;
if (!Parser.ReadBYTE(out IsPlayer))
return;
SendMstCommunityAccountAuthorization(Sender, AccountName, ConnectStatus.CONNECT_ERR_SUCCESS);
}
/// <summary>
/// This method parses and handles a status request from a game server
/// or game client.
/// </summary>
/// <param name="Parser">Supplies the message parser context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvMstStatusRequest(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 DataPort;
if (!Parser.ReadWORD(out DataPort))
return;
//
// Do not enter the server into the server list until
// bidirectional communication has been established. However,
// some broken NATs may respond briefly to the current source
// port and then choose another (different!) source port later
// for future pings. To handle this case, send a BNXI probe to
// both internal and external addresses. If the responses are
// the same, then assume that the server is actually located at
// the internal address; otherwise, create server records for
// both servers.
//
if (DataPort != (UInt16)Sender.Port)
{
IPEndPoint InternalAddress = new IPEndPoint(Sender.Address, (int)DataPort);
SendServerInfoRequest(InternalAddress);
}
SendServerInfoRequest(Sender);
SendMstStatusResponse(Sender, MstStatus.MST_STATUS_ONLINE);
}
/// <summary>
/// This method parses a server info response from a game server.
/// </summary>
/// <param name="Parser">Supplies the message parser context.</param>
/// <param name="Sender">Supplies the game server address.</param>
/// <param name="Socket">Supplies the associated socket descriptor
/// upon which the message was received.</param>
private void OnRecvServerInfoResponse(ExoParseBuffer Parser, IPEndPoint Sender, SocketInfo Socket)
{
UInt16 DataPort;
Byte Reserved; // 0xFC
Byte HasPlayerPassword;
Byte MinLevel;
Byte MaxLevel;
Byte ActivePlayers;
Byte MaximumPlayers;
Byte IsLocalVault;
Byte PVPLevel;
Byte IsPlayerPauseAllowed;
Byte IsOnePartyOnly;
Byte IsELC;
Byte HasILR;
Byte ExpansionsMask;
string ModuleName;
string BuildNumber;
ServerInfo Info = new ServerInfo();
if (!Parser.ReadWORD(out DataPort))
return;
if (!Parser.ReadBYTE(out Reserved))
return;
if (Mode == GameMode.NWN2)
{
if (Reserved != 0xFC)
return;
}
else
{
if (Reserved != 0xFD)
return;
}
if (!Parser.ReadBYTE(out HasPlayerPassword))
return;
if (!Parser.ReadBYTE(out MinLevel))
return;
if (!Parser.ReadBYTE(out MaxLevel))
return;
if (!Parser.ReadBYTE(out ActivePlayers))
return;
if (!Parser.ReadBYTE(out MaximumPlayers))
return;
if (!Parser.ReadBYTE(out IsLocalVault))
return;
if (!Parser.ReadBYTE(out PVPLevel))
return;
if (!Parser.ReadBYTE(out IsPlayerPauseAllowed))
return;
if (!Parser.ReadBYTE(out IsOnePartyOnly))
return;
if (!Parser.ReadBYTE(out IsELC))
return;
if (!Parser.ReadBYTE(out HasILR))
return;
if (!Parser.ReadBYTE(out ExpansionsMask))
return;
if (!Parser.ReadSmallString(out ModuleName))
return;
if (Mode == GameMode.NWN2)
{
if (!Parser.ReadSmallString(out BuildNumber))
return;
}
else
{
BuildNumber = "0";
}
try
{
Info.BuildNumber = Convert.ToUInt16(BuildNumber);
}
catch
{
Info.BuildNumber = 0;
}
//
// Query for whether the sender is blacklisted and drop the message
// if so.
//
BlacklistLookup Lookup = new BlacklistLookup();
Lookup.ServerAddress = Sender;
Lookup.ModuleName = ModuleName;
if (ServerTracker.IsBlacklisted(Lookup))
return;
Info.HasPlayerPassword = (HasPlayerPassword != 0);
Info.MinLevel = MinLevel;
Info.MaxLevel = MaxLevel;
Info.ActivePlayers = ActivePlayers;
Info.MaximumPlayers = MaximumPlayers;
Info.IsLocalVault = (IsLocalVault != 0);
Info.PVPLevel = PVPLevel;
Info.IsPlayerPauseAllowed = (IsPlayerPauseAllowed != 0);
Info.IsOnePartyOnly = (IsOnePartyOnly != 0);
Info.IsELC = (IsELC != 0);
Info.HasILR = (HasILR != 0);
Info.ExpansionsMask = ExpansionsMask;
Info.ModuleName = ModuleName;
//
// Look up the server and update the current server information.
// Since the BNXR reply is used to differentiate between broken
// NATs and endpoints with multiple servers on the same IP address,
// carefully check for whether a duplicate server record exists on
// the server internal port before creating a new server record.
//
NWGameServer Server;
Server = ServerTracker.LookupServerByAddress(Sender);
if (Mode != GameMode.NWN2)
Info.BuildNumber = Server.BuildNumber;
Server.OnServerInfoUpdate(Info);
if (DataPort == (UInt16)Sender.Port)
{
//
// Both internal and external ports match; the sender is not
// likely behind a NAT. No action is necessary behind the
// creation of the server record above.
//
}
else
{
NWGameServer ServerInternal;
IPEndPoint InternalAddress = new IPEndPoint(Sender.Address, (int)DataPort);
ServerInternal = ServerTracker.LookupServerByAddress(InternalAddress, false);
if (ServerInternal == null)
{
//
// No record of a server existing at the internal address
// is yet known. Proceed to create the server record at
// the external address (as was already performed above).
//
}
else
{
//
// A record exists for both internal and external
// addresses for the server. If the configuration values
// between both servers are the same, then mark the
// external address version as offline and prefer the
// internal server address as authoritative (since it must
// be globally reachable for a response to have been
// received).
//
if (ServerInternal.CheckForNATDuplicate(Server))
{
Logger.Log(LogLevel.Normal, "NWMasterServer.OnRecvServerInfoResponse(): Removing NAT duplicate server {0} in preference of server {1}.", Sender, InternalAddress);
return;
}
}
}
Logger.Log(LogLevel.Verbose, "NWMasterServer.OnRecvServerInfoResponse(): Server {0} has {1}/{2} players ({3}).", Sender, Info.ActivePlayers, Info.MaximumPlayers,
Info.ModuleName);
}
