void MCPingCommand(CommandDetails command)
{
if (command.Arguments.Count <= 0)
{
Chat(command.Channel.Name, command.Pinger + ColorGeneral + "That command is written as: " + ColorHighlightMajor + Prefixes[0] + command.Name + " <Minecraft server IP address>");
return;
}
IRCUser user = new IRCUser(command.Arguments[0]);
string IP = user.Settings.ReadString("general.minecraft_server_ip", null);
if (IP == null)
{
IP = command.Arguments[0];
}
ushort port = 0;
if (IP.Contains(':'))
{
string[] dat = IP.Split(new char[] { ':' }, 2);
IP = dat[0];
port = Utilities.StringToUShort(dat[1]);
}
if (port == 0)
{
try
{
DnsQueryRequest dqr = new DnsQueryRequest();
DnsQueryResponse resp = dqr.Resolve("_minecraft._tcp." + IP, NsType.SRV, NsClass.ANY, ProtocolType.Tcp);
if (resp != null)
{
for (int i = 0; i < resp.AdditionalRRecords.Count; i++)
{
if (resp.AdditionalRRecords[i] is SrvRecord)
{
port = (ushort)((SrvRecord)resp.AdditionalRRecords[i]).Port;
}
}
for (int i = 0; i < resp.Answers.Length; i++)
{
if (resp.Answers[i] is SrvRecord)
{
port = (ushort)((SrvRecord)resp.Answers[i]).Port;
}
}
}
else
{
Logger.Output(LogType.DEBUG, "Null SRV record.");
}
if (port == 0)
{
port = (ushort)25565;
}
}
catch (Exception ex)
{
Logger.Output(LogType.ERROR, "Pinging a SRV record for a minecraft server: " + ex.ToString());
port = 25565;
}
}
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
Stopwatch Timer = new Stopwatch();
Timer.Reset();
Timer.Start();
sock.SendBufferSize = 8192;
sock.ReceiveBufferSize = 8192 * 10;
sock.ReceiveTimeout = 3000;
sock.SendTimeout = 3000;
IAsyncResult result = sock.BeginConnect(IP, port, null, null);
bool timeout = !result.AsyncWaitHandle.WaitOne(5000, true);
if (timeout)
{
throw new Exception("Connection timed out");
}
if (!sock.Connected)
{
throw new Exception("Failed to connect");
}
byte[] address = UTF8.GetBytes(IP);
int packlen = 1 + 1 + 1 + address.Length + 2 + 1;
byte[] send = new byte[1 + packlen + 1 + 1];
byte[] portbytes = BitConverter.GetBytes(port).Reverse().ToArray();
send[0] = (byte)packlen; // packet length
send[1] = (byte)0x00; // Packet ID
send[2] = (byte)0x04; // Protocol Version
send[3] = (byte)address.Length; // Address string length
address.CopyTo(send, 4); // Address string
portbytes.CopyTo(send, address.Length + 4); // Port
send[address.Length + 6] = (byte)0x01; // Next state
send[address.Length + 7] = (byte)0x01; // Next packet length
send[address.Length + 8] = (byte)0x00; // Empty state request packet ~ packet ID
sock.Send(send);
int length = 0;
// Packet size -> packet ID -> JSON length
for (int x = 0; x < 2; x++)
{
length = 0;
int j = 0;
while (true)
{
byte[] recd = new byte[1];
sock.Receive(recd, 1, SocketFlags.None);
int k = recd[0];
length |= (k & 0x7F) << j++ * 7;
if (j > 5) throw new Exception("VarInt too big");
if ((k & 0x80) != 128) break;
if (Timer.ElapsedMilliseconds > 7000)
throw new Exception("Timeout while reading response");
}
if (x == 0)
{
byte[] resp = new byte[1];
sock.Receive(resp, 1, SocketFlags.None);
}
}
int gotten = 0;
byte[] response = new byte[length];
while (gotten < length)
{
byte[] gotbit = new byte[length - gotten];
int newgot = sock.Receive(gotbit, length - gotten, SocketFlags.None);
gotbit.CopyTo(response, gotten);
gotten += newgot;
if (Timer.ElapsedMilliseconds > 7000)
throw new Exception("Timeout while reading response");
}
string fullresponse = UTF8.GetString(response);
int ind = fullresponse.IndexOf('{');
if (ind < 0)
{
throw new Exception("Invalid response packet - is that an actual minecraft server?");
}
fullresponse = fullresponse.Substring(ind);
Dictionary<string, dynamic> dict = new JavaScriptSerializer().Deserialize<Dictionary<string, dynamic>>(fullresponse.Trim());
string version = dict["version"]["name"].ToString();
string versionnum = dict["version"]["protocol"].ToString();
string players_on = dict["players"]["online"].ToString();
string players_max = dict["players"]["max"].ToString();
string description;
if (dict["description"] is Dictionary<String, Object>)
{
description = dict["description"]["text"].ToString();
}
else
{
description = dict["description"].ToString();
}
Chat(command.Channel.Name, command.Pinger + ColorGeneral + "Server: " + IP + ":" + port.ToString() + ", MOTD: '"
+ Utilities.mctoirc(description) + ColorGeneral + "', players: " + players_on + "/" + players_max + ", version: " + Utilities.mctoirc(version));
}
catch (Exception ex)
{
Logger.Output(LogType.DEBUG, "Pinging minecraft server: " + ex.ToString());
Chat(command.Channel.Name, command.Pinger + ColorGeneral + "Couldn't ping server: internal exception: " + ex.Message);
}
finally
{
sock.Close();
}
}
