498 lines
20 KiB
C#
498 lines
20 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading;
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using System.Threading.Tasks;
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using Microsoft.Extensions.Logging;
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using Serilog.Context;
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using SharedLibraryCore;
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using SharedLibraryCore.Exceptions;
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using SharedLibraryCore.Interfaces;
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using SharedLibraryCore.RCon;
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using ILogger = Microsoft.Extensions.Logging.ILogger;
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namespace Integrations.Cod
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{
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/// <summary>
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/// implementation of IRConConnection
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/// </summary>
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public class CodRConConnection : IRConConnection
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{
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private static readonly ConcurrentDictionary<EndPoint, ConnectionState> ActiveQueries = new();
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public IPEndPoint Endpoint { get; }
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public string RConPassword { get; }
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private IRConParser _parser;
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private IRConParserConfiguration _config;
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private readonly ILogger _log;
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private readonly Encoding _gameEncoding;
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private readonly int _retryAttempts;
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public CodRConConnection(IPEndPoint ipEndpoint, string password, ILogger<CodRConConnection> log,
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Encoding gameEncoding, int retryAttempts)
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{
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RConPassword = password;
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_gameEncoding = gameEncoding;
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_log = log;
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Endpoint = ipEndpoint;
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_retryAttempts = retryAttempts;
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}
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public void SetConfiguration(IRConParser parser)
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{
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_parser = parser;
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_config = parser.Configuration;
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}
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public async Task<string[]> SendQueryAsync(StaticHelpers.QueryType type, string parameters = "",
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CancellationToken token = default)
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{
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try
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{
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return await SendQueryAsyncInternal(type, parameters, token);
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}
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catch (RConException ex) when (ex.IsOperationCancelled)
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{
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_log.LogDebug(ex, "Could not complete RCon request");
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throw;
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}
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catch (Exception ex)
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{
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using (LogContext.PushProperty("Server", Endpoint.ToString()))
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{
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_log.LogWarning(ex, "Could not complete RCon request");
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}
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throw;
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}
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finally
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{
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_log.LogDebug("Releasing OnComplete {Count}", ActiveQueries[Endpoint].OnComplete.CurrentCount);
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if (ActiveQueries[Endpoint].OnComplete.CurrentCount == 0)
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{
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ActiveQueries[Endpoint].OnComplete.Release();
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}
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}
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}
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private async Task<string[]> SendQueryAsyncInternal(StaticHelpers.QueryType type, string parameters = "",
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CancellationToken token = default)
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{
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if (!ActiveQueries.ContainsKey(Endpoint))
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{
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ActiveQueries.TryAdd(Endpoint, new ConnectionState());
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}
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if (!ActiveQueries.TryGetValue(Endpoint, out var connectionState))
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{
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using (LogContext.PushProperty("Server", Endpoint.ToString()))
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{
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_log.LogError("Could not retrieve connection state");
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}
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throw new InvalidOperationException("Could not get connection state");
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}
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_log.LogDebug("Waiting for semaphore to be released [{Endpoint}]", Endpoint);
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// enter the semaphore so only one query is sent at a time per server.
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try
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{
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await connectionState.OnComplete.WaitAsync(token);
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}
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catch (OperationCanceledException)
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{
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_log.LogDebug("OnComplete did not complete before timeout {Count}",
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connectionState.OnComplete.CurrentCount);
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throw new RConException("Timed out waiting for access to rcon socket", true);
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}
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var timeSinceLastQuery = (DateTime.Now - connectionState.LastQuery).TotalMilliseconds;
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if (timeSinceLastQuery < _config.FloodProtectInterval)
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{
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try
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{
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var delay = _config.FloodProtectInterval - (int)timeSinceLastQuery;
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_log.LogDebug("Delaying for {Delay}ms", delay);
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await Task.Delay(delay, token);
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}
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catch (OperationCanceledException)
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{
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_log.LogDebug("Waiting for flood protect did not complete before timeout timeout {Count}",
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connectionState.OnComplete.CurrentCount);
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throw new RConException("Timed out waiting for flood protect to expire", true);
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}
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}
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_log.LogDebug("Semaphore has been released [{Endpoint}]", Endpoint);
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_log.LogDebug("Query {@QueryInfo}", new { endpoint = Endpoint.ToString(), type, parameters });
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byte[] payload = null;
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var waitForResponse = _config.WaitForResponse;
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string ConvertEncoding(string text)
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{
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var convertedBytes = Utilities.EncodingType.GetBytes(text);
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return _gameEncoding.GetString(convertedBytes);
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}
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try
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{
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var convertedRConPassword = ConvertEncoding(RConPassword);
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var convertedParameters = ConvertEncoding(parameters);
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switch (type)
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{
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case StaticHelpers.QueryType.GET_DVAR:
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waitForResponse = true;
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payload = string
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.Format(_config.CommandPrefixes.RConGetDvar, convertedRConPassword,
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convertedParameters + '\0').Select(Convert.ToByte).ToArray();
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break;
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case StaticHelpers.QueryType.SET_DVAR:
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payload = string
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.Format(_config.CommandPrefixes.RConSetDvar, convertedRConPassword,
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convertedParameters + '\0').Select(Convert.ToByte).ToArray();
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break;
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case StaticHelpers.QueryType.COMMAND:
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payload = string
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.Format(_config.CommandPrefixes.RConCommand, convertedRConPassword,
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convertedParameters + '\0').Select(Convert.ToByte).ToArray();
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break;
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case StaticHelpers.QueryType.GET_STATUS:
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waitForResponse = true;
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payload = (_config.CommandPrefixes.RConGetStatus + '\0').Select(Convert.ToByte).ToArray();
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break;
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case StaticHelpers.QueryType.GET_INFO:
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waitForResponse = true;
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payload = (_config.CommandPrefixes.RConGetInfo + '\0').Select(Convert.ToByte).ToArray();
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break;
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case StaticHelpers.QueryType.COMMAND_STATUS:
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waitForResponse = true;
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payload = string.Format(_config.CommandPrefixes.RConCommand, convertedRConPassword, "status\0")
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.Select(Convert.ToByte).ToArray();
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break;
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}
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}
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// this happens when someone tries to send something that can't be converted into a 7 bit character set
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// e.g: emoji -> windows-1252
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catch (OverflowException ex)
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{
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using (LogContext.PushProperty("Server", Endpoint.ToString()))
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{
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_log.LogError(ex, "Could not convert RCon data payload to desired encoding {Encoding} {Params}",
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_gameEncoding.EncodingName, parameters);
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}
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throw new RConException("Invalid character encountered when converting encodings");
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}
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byte[][] response;
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retrySend:
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using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp)
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{
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DontFragment = false,
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Ttl = 100,
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ExclusiveAddressUse = true,
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})
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{
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if (!token.IsCancellationRequested)
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{
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connectionState.ConnectionAttempts++;
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}
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connectionState.ReceivedBytes.Clear();
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_log.LogDebug(
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"Sending {PayloadLength} bytes to [{Endpoint}] ({ConnectionAttempts}/{AllowedConnectionFailures}) parameters {Payload}",
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payload.Length, Endpoint, connectionState.ConnectionAttempts, _retryAttempts, parameters);
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try
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{
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connectionState.LastQuery = DateTime.Now;
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var retryTimeout = StaticHelpers.SocketTimeout(connectionState.ConnectionAttempts);
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var overrideTimeout = _parser.OverrideTimeoutForCommand(parameters);
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var maxTimeout = !overrideTimeout.HasValue || overrideTimeout == TimeSpan.Zero
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? retryTimeout
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: overrideTimeout.Value;
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using var internalTokenSource = new CancellationTokenSource(maxTimeout);
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using var chainedTokenSource =
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CancellationTokenSource.CreateLinkedTokenSource(token, internalTokenSource.Token);
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if (connectionState.ConnectionAttempts > 1)
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{
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using (LogContext.PushProperty("Server", Endpoint.ToString()))
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{
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_log.LogInformation(
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"Retrying RCon message ({ConnectionAttempts}/{AllowedConnectionFailures} attempts, {Timeout}ms timeout) with parameters {Payload}",
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connectionState.ConnectionAttempts, _retryAttempts,
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maxTimeout.TotalMilliseconds, parameters);
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}
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}
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waitForResponse = waitForResponse && overrideTimeout.HasValue;
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response = await SendPayloadAsync(socket, payload, waitForResponse, chainedTokenSource.Token);
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if ((response?.Length == 0 || response[0].Length == 0) && waitForResponse)
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{
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_log.LogDebug("0 bytes received from rcon request");
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throw new RConException("Expected response but got 0 bytes back");
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}
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connectionState.ConnectionAttempts = 0;
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}
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catch (OperationCanceledException)
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{
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_log.LogDebug("OperationCanceledException when waiting for payload send to complete");
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// if we timed out due to the cancellation token,
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// we don't want to count that as an attempt
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if (token.IsCancellationRequested)
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{
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if (connectionState.ConnectionAttempts > 0)
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{
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connectionState.ConnectionAttempts--;
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}
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throw new RConException("Timed out waiting on retry delay for RCon socket",
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token.IsCancellationRequested);
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}
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if (connectionState.ConnectionAttempts < _retryAttempts)
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{
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goto retrySend;
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}
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using (LogContext.PushProperty("Server", Endpoint.ToString()))
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{
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_log.LogWarning(
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"Made {ConnectionAttempts} attempts to send RCon data to server, but received no response",
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connectionState.ConnectionAttempts);
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}
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connectionState.ConnectionAttempts = 0;
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throw new NetworkException("Reached maximum retry attempts to send RCon data to server");
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}
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catch (Exception ex)
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{
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_log.LogDebug(ex, "RCon Exception");
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if (connectionState.ConnectionAttempts < _retryAttempts)
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{
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goto retrySend;
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}
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using (LogContext.PushProperty("Server", Endpoint.ToString()))
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{
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_log.LogWarning(
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"Made {ConnectionAttempts} attempts to send RCon data to server, but received no response",
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connectionState.ConnectionAttempts);
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}
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connectionState.ConnectionAttempts = 0;
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throw new NetworkException("Reached maximum retry attempts to send RCon data to server");
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}
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}
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// at this point we can run in parallel and the next request can start because we have our data
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if (response.Length == 0)
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{
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_log.LogDebug("Received empty response for RCon request {@Query}",
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new { endpoint = Endpoint.ToString(), type, parameters });
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return Array.Empty<string>();
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}
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var responseString = type == StaticHelpers.QueryType.COMMAND_STATUS
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? ReassembleSegmentedStatus(response)
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: RecombineMessages(response);
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var validatedResponse = ValidateResponse(type, responseString);
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return validatedResponse;
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}
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private async Task<byte[][]> SendPayloadAsync(Socket rconSocket, byte[] payload, bool waitForResponse,
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CancellationToken token = default)
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{
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var connectionState = ActiveQueries[Endpoint];
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if (rconSocket is null)
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{
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_log.LogDebug("Invalid state");
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throw new InvalidOperationException("State is not valid for socket operation");
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}
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var sentByteCount = await rconSocket.SendToAsync(payload, SocketFlags.None, Endpoint, token);
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var complete = sentByteCount == payload.Length;
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if (!complete)
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{
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using (LogContext.PushProperty("Server", Endpoint.ToString()))
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{
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_log.LogWarning("Could not send data to remote RCon socket on attempt #{ConnectionAttempts}",
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connectionState.ConnectionAttempts);
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}
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rconSocket.Close();
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throw new NetworkException("Could not send data to remote RCon socket", rconSocket);
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}
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if (!waitForResponse)
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{
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return Array.Empty<byte[]>();
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}
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_log.LogDebug("Waiting to asynchronously receive data on attempt #{ConnectionAttempts}",
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connectionState.ConnectionAttempts);
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await ReceiveAndStoreSocketData(rconSocket, token, connectionState);
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if (_parser.GameName is Server.Game.IW3 or Server.Game.T4)
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{
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await Task.Delay(100, token); // CoD4x shenanigans
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}
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while (rconSocket.Available > 0)
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{
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await ReceiveAndStoreSocketData(rconSocket, token, connectionState);
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}
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rconSocket.Close();
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return GetResponseData(connectionState);
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}
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private async Task ReceiveAndStoreSocketData(Socket rconSocket, CancellationToken token,
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ConnectionState connectionState)
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{
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var result = await rconSocket.ReceiveFromAsync(connectionState.ReceiveBuffer,
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SocketFlags.None, Endpoint, token);
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if (result.ReceivedBytes == 0)
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{
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return;
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}
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var storageBuffer = new byte[result.ReceivedBytes];
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Array.Copy(connectionState.ReceiveBuffer, storageBuffer, storageBuffer.Length);
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connectionState.ReceivedBytes.Add(storageBuffer);
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}
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#region Helpers
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private string[] ValidateResponse(StaticHelpers.QueryType type, string responseString)
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{
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// note: not all games respond if the password is wrong or not set
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if (responseString.Contains("Invalid password", StringComparison.InvariantCultureIgnoreCase) ||
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responseString.Contains("rconpassword"))
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{
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throw new RConException(Utilities.CurrentLocalization.LocalizationIndex["SERVER_ERROR_RCON_INVALID"]);
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}
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if (responseString.Contains("rcon_password"))
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{
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throw new RConException(Utilities.CurrentLocalization.LocalizationIndex["SERVER_ERROR_RCON_NOTSET"]);
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}
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if (responseString.Contains(_config.ServerNotRunningResponse))
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{
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throw new ServerException(Utilities.CurrentLocalization.LocalizationIndex["SERVER_ERROR_NOT_RUNNING"]
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.FormatExt(Endpoint.ToString()));
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}
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var responseHeaderMatch = Regex.Match(responseString, _config.CommandPrefixes.RConResponse).Value;
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var headerSplit = responseString.Split(type == StaticHelpers.QueryType.GET_INFO
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? _config.CommandPrefixes.RconGetInfoResponseHeader
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: responseHeaderMatch);
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if (headerSplit.Length == 2)
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{
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return headerSplit.Last().Split(new[] { '\n' }, StringSplitOptions.RemoveEmptyEntries)
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.Select(line => line.StartsWith("^7") ? line[2..] : line).ToArray();
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}
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using (LogContext.PushProperty("Server", Endpoint.ToString()))
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{
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_log.LogWarning("Invalid response header from server. Expected {Expected}, but got {Response}",
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_config.CommandPrefixes.RConResponse, headerSplit.FirstOrDefault());
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}
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throw new RConException("Unexpected response header from server");
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}
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/// <summary>
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/// reassembles broken status segments into the 'correct' ordering
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/// <remarks>this is primarily for T7, and is really only reliable for 2 segments</remarks>
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/// </summary>
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/// <param name="segments">array of segmented byte arrays</param>
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/// <returns></returns>
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private string ReassembleSegmentedStatus(IEnumerable<byte[]> segments)
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{
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var splitStatusStrings = new List<string>();
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foreach (var segment in segments)
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{
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var responseString = _gameEncoding.GetString(segment, 0, segment.Length);
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var statusHeaderMatch = _config.StatusHeader.PatternMatcher.Match(responseString);
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if (statusHeaderMatch.Success)
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{
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splitStatusStrings.Insert(0, responseString.TrimEnd('\0'));
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}
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else
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{
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splitStatusStrings.Add(responseString.Replace(_config.CommandPrefixes.RConResponse, "")
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.TrimEnd('\0'));
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}
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}
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return string.Join("", splitStatusStrings);
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}
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/// <summary>
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/// Recombines multiple game messages into one
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/// </summary>
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/// <param name="payload"></param>
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/// <returns></returns>
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private string RecombineMessages(IReadOnlyList<byte[]> payload)
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{
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if (payload.Count == 1)
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{
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return _gameEncoding.GetString(payload[0]).TrimEnd('\n') + '\n';
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}
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var builder = new StringBuilder();
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for (var i = 0; i < payload.Count; i++)
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{
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var message = _gameEncoding.GetString(payload[i]).TrimEnd('\n') + '\n';
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if (i > 0)
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{
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message = message.Replace(_config.CommandPrefixes.RConResponse, "");
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}
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builder.Append(message);
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}
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builder.Append('\n');
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return builder.ToString();
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}
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private static byte[][] GetResponseData(ConnectionState connectionState)
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{
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return connectionState.ReceivedBytes.ToArray();
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}
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#endregion
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}
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}
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