752 lines
26 KiB
C#
752 lines
26 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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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.Threading.Tasks;
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using OSHttpServer.Exceptions;
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using OSHttpServer.Parser;
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using System.Net.Security;
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using System.Security.Cryptography.X509Certificates;
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namespace OSHttpServer
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{
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/// <summary>
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/// Contains a connection to a browser/client.
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/// </summary>
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/// <remarks>
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/// Remember to <see cref="Start"/> after you have hooked the <see cref="RequestReceived"/> event.
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/// </remarks>
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public class HttpClientContext : IHttpClientContext, IDisposable
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{
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const int MAXREQUESTS = 20;
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const int MAXKEEPALIVE = 120000;
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static private int basecontextID;
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Queue<HttpRequest> m_requests;
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object m_requestsLock = new object();
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public int m_maxRequests = MAXREQUESTS;
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public bool m_waitingResponse;
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private readonly byte[] m_ReceiveBuffer;
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private int m_ReceiveBytesLeft;
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private ILogWriter m_log;
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private readonly IHttpRequestParser m_parser;
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private Socket m_sock;
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public bool Available = true;
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public bool StreamPassedOff = false;
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public int LastActivityTimeMS = 0;
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public int MonitorKeepaliveStartMS = 0;
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public bool TriggerKeepalive = false;
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public int TimeoutFirstLine = 10000; // 10 seconds
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public int TimeoutRequestReceived = 30000; // 30 seconds
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public int TimeoutMaxIdle = 180000; // 3 minutes
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public int m_TimeoutKeepAlive = 60000;
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public bool FirstRequestLineReceived;
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public bool FullRequestReceived;
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private bool isSendingResponse = false;
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private bool m_isClosing = false;
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private HttpRequest m_currentRequest;
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private HttpResponse m_currentResponse;
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public int contextID { get; private set; }
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public int TimeoutKeepAlive
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{
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get { return m_TimeoutKeepAlive; }
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set
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{
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m_TimeoutKeepAlive = (value > MAXKEEPALIVE) ? MAXKEEPALIVE : value;
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}
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}
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public bool IsClosing
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{
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get { return m_isClosing;}
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}
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public int MaxRequests
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{
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get { return m_maxRequests; }
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set
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{
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if(value <= 1)
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m_maxRequests = 1;
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else
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m_maxRequests = value > MAXREQUESTS ? MAXREQUESTS : value;
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}
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}
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public bool IsSending()
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{
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return isSendingResponse;
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}
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public bool StopMonitoring;
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public IPEndPoint LocalIPEndPoint {get; set;}
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/// <summary>
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/// Initializes a new instance of the <see cref="HttpClientContext"/> class.
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/// </summary>
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/// <param name="secured">true if the connection is secured (SSL/TLS)</param>
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/// <param name="remoteEndPoint">client that connected.</param>
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/// <param name="stream">Stream used for communication</param>
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/// <param name="parserFactory">Used to create a <see cref="IHttpRequestParser"/>.</param>
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/// <param name="bufferSize">Size of buffer to use when reading data. Must be at least 4096 bytes.</param>
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/// <exception cref="SocketException">If <see cref="Socket.BeginReceive(byte[],int,int,SocketFlags,AsyncCallback,object)"/> fails</exception>
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/// <exception cref="ArgumentException">Stream must be writable and readable.</exception>
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public HttpClientContext(bool secured, IPEndPoint remoteEndPoint,
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Stream stream, ILogWriter m_logWriter, Socket sock)
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{
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if (!stream.CanWrite || !stream.CanRead)
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throw new ArgumentException("Stream must be writable and readable.");
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LocalIPEndPoint = remoteEndPoint;
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m_log = m_logWriter;
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m_isClosing = false;
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m_parser = new HttpRequestParser(m_log);
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m_parser.RequestCompleted += OnRequestCompleted;
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m_parser.RequestLineReceived += OnRequestLine;
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m_parser.HeaderReceived += OnHeaderReceived;
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m_parser.BodyBytesReceived += OnBodyBytesReceived;
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m_currentRequest = new HttpRequest(this);
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IsSecured = secured;
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m_stream = stream;
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m_sock = sock;
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m_ReceiveBuffer = new byte[16384];
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m_requests = new Queue<HttpRequest>();
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SSLCommonName = "";
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if (secured)
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{
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SslStream _ssl = (SslStream)m_stream;
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X509Certificate _cert1 = _ssl.RemoteCertificate;
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if (_cert1 != null)
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{
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X509Certificate2 _cert2 = new X509Certificate2(_cert1);
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if (_cert2 != null)
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SSLCommonName = _cert2.GetNameInfo(X509NameType.SimpleName, false);
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}
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}
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++basecontextID;
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if (basecontextID <= 0)
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basecontextID = 1;
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contextID = basecontextID;
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sock.NoDelay = true;
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}
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public bool CanSend()
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{
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if (contextID < 0 || m_isClosing)
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return false;
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if (m_stream == null || m_sock == null || !m_sock.Connected)
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return false;
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return true;
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}
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/// <summary>
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/// Process incoming body bytes.
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/// </summary>
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/// <param name="sender"><see cref="IHttpRequestParser"/></param>
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/// <param name="e">Bytes</param>
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protected virtual void OnBodyBytesReceived(object sender, BodyEventArgs e)
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{
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m_currentRequest.AddToBody(e.Buffer, e.Offset, e.Count);
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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protected virtual void OnHeaderReceived(object sender, HeaderEventArgs e)
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{
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if (string.Compare(e.Name, "expect", true) == 0 && e.Value.Contains("100-continue"))
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{
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lock (m_requestsLock)
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{
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if (m_maxRequests == MAXREQUESTS)
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Respond("HTTP/1.1", HttpStatusCode.Continue, null);
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}
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}
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m_currentRequest.AddHeader(e.Name, e.Value);
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}
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private void OnRequestLine(object sender, RequestLineEventArgs e)
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{
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m_currentRequest.Method = e.HttpMethod;
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m_currentRequest.HttpVersion = e.HttpVersion;
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m_currentRequest.UriPath = e.UriPath;
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m_currentRequest.AddHeader("remote_addr", LocalIPEndPoint.Address.ToString());
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m_currentRequest.AddHeader("remote_port", LocalIPEndPoint.Port.ToString());
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m_currentRequest.ArrivalTS = ContextTimeoutManager.GetTimeStamp();
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FirstRequestLineReceived = true;
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TriggerKeepalive = false;
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MonitorKeepaliveStartMS = 0;
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LastActivityTimeMS = ContextTimeoutManager.EnvironmentTickCount();
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}
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/// <summary>
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/// Start reading content.
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/// </summary>
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/// <remarks>
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/// Make sure to call base.Start() if you override this method.
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/// </remarks>
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public virtual void Start()
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{
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Task tk = new Task(() => ReceiveLoop());
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tk.Start();
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}
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/// <summary>
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/// Clean up context.
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/// </summary>
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/// <remarks>
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/// </remarks>
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public virtual void Cleanup()
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{
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if (StreamPassedOff)
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return;
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contextID = -100;
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if (m_stream != null)
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{
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m_stream.Close();
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m_stream = null;
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m_sock = null;
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}
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m_currentRequest?.Clear();
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m_currentRequest = null;
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m_currentResponse?.Clear();
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m_currentResponse = null;
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if(m_requests != null)
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{
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while(m_requests.Count > 0)
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{
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HttpRequest req = m_requests.Dequeue();
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req.Clear();
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}
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}
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m_requests.Clear();
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m_requests = null;
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m_parser.Clear();
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FirstRequestLineReceived = false;
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FullRequestReceived = false;
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LastActivityTimeMS = 0;
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StopMonitoring = true;
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MonitorKeepaliveStartMS = 0;
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TriggerKeepalive = false;
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isSendingResponse = false;
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m_ReceiveBytesLeft = 0;
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}
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public void Close()
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{
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Dispose();
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}
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/// <summary>
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/// Using SSL or other encryption method.
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/// </summary>
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[Obsolete("Use IsSecured instead.")]
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public bool Secured
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{
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get { return IsSecured; }
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}
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/// <summary>
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/// Using SSL or other encryption method.
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/// </summary>
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public bool IsSecured { get; internal set; }
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// returns the SSL commonName of remote Certificate
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public string SSLCommonName { get; internal set; }
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/// <summary>
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/// Specify which logger to use.
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/// </summary>
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public ILogWriter LogWriter
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{
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get { return m_log; }
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set
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{
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m_log = value ?? NullLogWriter.Instance;
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m_parser.LogWriter = m_log;
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}
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}
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private Stream m_stream;
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/// <summary>
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/// Gets or sets the network stream.
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/// </summary>
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internal Stream Stream
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{
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get { return m_stream; }
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set { m_stream = value; }
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}
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/// <summary>
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/// Disconnect from client
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/// </summary>
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/// <param name="error">error to report in the <see cref="Disconnected"/> event.</param>
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public void Disconnect(SocketError error)
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{
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// disconnect may not throw any exceptions
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try
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{
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try
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{
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if (m_stream != null)
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{
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if (error == SocketError.Success)
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{
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try
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{
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m_stream.Flush();
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}
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catch { }
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}
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m_stream.Close();
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m_stream = null;
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}
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m_sock = null;
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}
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catch { }
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Disconnected?.Invoke(this, new DisconnectedEventArgs(error));
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}
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catch (Exception err)
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{
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LogWriter.Write(this, LogPrio.Error, "Disconnect threw an exception: " + err);
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}
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}
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private async void ReceiveLoop()
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{
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m_ReceiveBytesLeft = 0;
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try
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{
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while(true)
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{
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if (m_stream == null || !m_stream.CanRead)
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return;
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int bytesRead = await m_stream.ReadAsync(m_ReceiveBuffer, m_ReceiveBytesLeft, m_ReceiveBuffer.Length - m_ReceiveBytesLeft).ConfigureAwait(false);
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if (bytesRead == 0)
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{
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Disconnect(SocketError.Success);
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return;
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}
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if(m_isClosing)
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continue;
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m_ReceiveBytesLeft += bytesRead;
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if (m_ReceiveBytesLeft > m_ReceiveBuffer.Length)
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throw new BadRequestException("HTTP header Too large: " + m_ReceiveBytesLeft);
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int offset = m_parser.Parse(m_ReceiveBuffer, 0, m_ReceiveBytesLeft);
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if (m_stream == null)
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return; // "Connection: Close" in effect.
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// try again to see if we can parse another message (check parser to see if it is looking for a new message)
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int nextOffset;
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int nextBytesleft = m_ReceiveBytesLeft - offset;
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while (offset != 0 && nextBytesleft > 0)
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{
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nextOffset = m_parser.Parse(m_ReceiveBuffer, offset, nextBytesleft);
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if (m_stream == null)
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return; // "Connection: Close" in effect.
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if (nextOffset == 0)
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break;
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offset = nextOffset;
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nextBytesleft = m_ReceiveBytesLeft - offset;
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}
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// copy unused bytes to the beginning of the array
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if (offset > 0 && m_ReceiveBytesLeft > offset)
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Buffer.BlockCopy(m_ReceiveBuffer, offset, m_ReceiveBuffer, 0, m_ReceiveBytesLeft - offset);
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m_ReceiveBytesLeft -= offset;
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if (StreamPassedOff)
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return; //?
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}
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}
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catch (BadRequestException err)
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{
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LogWriter.Write(this, LogPrio.Warning, "Bad request, responding with it. Error: " + err);
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try
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{
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Respond("HTTP/1.1", HttpStatusCode.BadRequest, err.Message);
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}
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catch (Exception err2)
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{
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LogWriter.Write(this, LogPrio.Fatal, "Failed to reply to a bad request. " + err2);
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}
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//Disconnect(SocketError.NoRecovery);
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Disconnect(SocketError.Success); // try to flush
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}
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catch (IOException err)
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{
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LogWriter.Write(this, LogPrio.Debug, "Failed to end receive: " + err.Message);
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if (err.InnerException is SocketException)
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Disconnect((SocketError)((SocketException)err.InnerException).ErrorCode);
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else
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Disconnect(SocketError.ConnectionReset);
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}
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catch (ObjectDisposedException err)
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{
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LogWriter.Write(this, LogPrio.Debug, "Failed to end receive : " + err.Message);
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Disconnect(SocketError.NotSocket);
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}
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catch (NullReferenceException err)
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{
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LogWriter.Write(this, LogPrio.Debug, "Failed to end receive : NullRef: " + err.Message);
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Disconnect(SocketError.NoRecovery);
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}
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catch (Exception err)
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{
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LogWriter.Write(this, LogPrio.Debug, "Failed to end receive: " + err.Message);
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Disconnect(SocketError.NoRecovery);
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}
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}
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private void OnRequestCompleted(object source, EventArgs args)
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{
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TriggerKeepalive = false;
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MonitorKeepaliveStartMS = 0;
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FullRequestReceived = true;
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LastActivityTimeMS = ContextTimeoutManager.EnvironmentTickCount();
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if (m_maxRequests == 0)
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return;
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if(--m_maxRequests == 0)
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m_currentRequest.Connection = ConnectionType.Close;
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if(m_currentRequest.Uri == null)
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{
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// should not happen
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try
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{
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Uri uri = new Uri(m_currentRequest.Secure ? "https://" : "http://" + m_currentRequest.UriPath);
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m_currentRequest.Uri = uri;
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m_currentRequest.UriPath = uri.AbsolutePath;
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}
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catch
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{
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return;
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}
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}
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// load cookies if they exist
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if(m_currentRequest.Headers["cookie"] != null)
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m_currentRequest.SetCookies(new RequestCookies(m_currentRequest.Headers["cookie"]));
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m_currentRequest.Body.Seek(0, SeekOrigin.Begin);
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bool donow = true;
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lock (m_requestsLock)
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{
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if(m_waitingResponse)
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{
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m_requests.Enqueue(m_currentRequest);
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donow = false;
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}
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else
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m_waitingResponse = true;
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}
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if(donow)
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RequestReceived?.Invoke(this, new RequestEventArgs(m_currentRequest));
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m_currentRequest = new HttpRequest(this);
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}
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public void StartSendResponse(HttpResponse response)
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{
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LastActivityTimeMS = ContextTimeoutManager.EnvironmentTickCount();
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isSendingResponse = true;
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m_currentResponse = response;
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ContextTimeoutManager.EnqueueSend(this, response.Priority);
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}
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public bool TrySendResponse(int bytesLimit)
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{
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if(m_currentResponse == null)
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return false;
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if (m_currentResponse.Sent)
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return false;
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if(!CanSend())
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return false;
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LastActivityTimeMS = ContextTimeoutManager.EnvironmentTickCount();
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m_currentResponse?.SendNextAsync(bytesLimit);
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return false;
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}
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public void ContinueSendResponse(bool notThrottled)
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{
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if(m_currentResponse == null)
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return;
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ContextTimeoutManager.EnqueueSend(this, m_currentResponse.Priority, notThrottled);
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}
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public async Task EndSendResponse(uint requestID, ConnectionType ctype)
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{
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isSendingResponse = false;
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m_currentResponse?.Clear();
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m_currentResponse = null;
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lock (m_requestsLock)
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m_waitingResponse = false;
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if(contextID < 0)
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return;
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bool doclose = ctype == ConnectionType.Close;
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if (doclose)
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{
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m_isClosing = true;
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m_requests.Clear();
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TriggerKeepalive = true;
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return;
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}
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else
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{
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LastActivityTimeMS = ContextTimeoutManager.EnvironmentTickCount();
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if (Stream != null && Stream.CanWrite)
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{
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ContextTimeoutManager.ContextEnterActiveSend();
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try
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{
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await Stream.FlushAsync().ConfigureAwait(false);
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}
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catch
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{
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};
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ContextTimeoutManager.ContextLeaveActiveSend();
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}
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if (Stream == null || !Stream.CanWrite)
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return;
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TriggerKeepalive = true;
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HttpRequest nextRequest = null;
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lock (m_requestsLock)
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{
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if (m_requests != null && m_requests.Count > 0)
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nextRequest = m_requests.Dequeue();
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if (nextRequest != null && RequestReceived != null)
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m_waitingResponse = true;
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}
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if (nextRequest != null)
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RequestReceived?.Invoke(this, new RequestEventArgs(nextRequest));
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}
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}
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/// <summary>
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/// Send a response.
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/// </summary>
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/// <param name="httpVersion">Either <see cref="HttpHelper.HTTP10"/> or <see cref="HttpHelper.HTTP11"/></param>
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/// <param name="statusCode">HTTP status code</param>
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/// <param name="reason">reason for the status code.</param>
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/// <param name="body">HTML body contents, can be null or empty.</param>
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|
/// <param name="contentType">A content type to return the body as, i.e. 'text/html' or 'text/plain', defaults to 'text/html' if null or empty</param>
|
|
/// <exception cref="ArgumentException">If <paramref name="httpVersion"/> is invalid.</exception>
|
|
public void Respond(string httpVersion, HttpStatusCode statusCode, string reason, string body, string contentType)
|
|
{
|
|
LastActivityTimeMS = ContextTimeoutManager.EnvironmentTickCount();
|
|
|
|
if (string.IsNullOrEmpty(reason))
|
|
reason = statusCode.ToString();
|
|
|
|
byte[] buffer;
|
|
if(string.IsNullOrEmpty(body))
|
|
buffer = Encoding.ASCII.GetBytes(httpVersion + " " + (int)statusCode + " " + reason + "\r\n\r\n");
|
|
else
|
|
{
|
|
if (string.IsNullOrEmpty(contentType))
|
|
contentType = "text/html";
|
|
buffer = Encoding.UTF8.GetBytes(
|
|
string.Format("{0} {1} {2}\r\nContent-Type: {5}\r\nContent-Length: {3}\r\n\r\n{4}",
|
|
httpVersion, (int)statusCode, reason ?? statusCode.ToString(),
|
|
body.Length, body, contentType));
|
|
}
|
|
Send(buffer);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Send a response.
|
|
/// </summary>
|
|
/// <param name="httpVersion">Either <see cref="HttpHelper.HTTP10"/> or <see cref="HttpHelper.HTTP11"/></param>
|
|
/// <param name="statusCode">HTTP status code</param>
|
|
/// <param name="reason">reason for the status code.</param>
|
|
public void Respond(string httpVersion, HttpStatusCode statusCode, string reason)
|
|
{
|
|
if (string.IsNullOrEmpty(reason))
|
|
reason = statusCode.ToString();
|
|
byte[] buffer = Encoding.ASCII.GetBytes(httpVersion + " " + (int)statusCode + " " + reason + "\r\n\r\n");
|
|
Send(buffer);
|
|
}
|
|
|
|
/// <summary>
|
|
/// send a whole buffer
|
|
/// </summary>
|
|
/// <param name="buffer">buffer to send</param>
|
|
/// <exception cref="ArgumentNullException"></exception>
|
|
public bool Send(byte[] buffer)
|
|
{
|
|
if (buffer == null)
|
|
throw new ArgumentNullException("buffer");
|
|
return Send(buffer, 0, buffer.Length);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Send data using the stream
|
|
/// </summary>
|
|
/// <param name="buffer">Contains data to send</param>
|
|
/// <param name="offset">Start position in buffer</param>
|
|
/// <param name="size">number of bytes to send</param>
|
|
/// <exception cref="ArgumentNullException"></exception>
|
|
/// <exception cref="ArgumentOutOfRangeException"></exception>
|
|
|
|
private object sendLock = new object();
|
|
|
|
public bool Send(byte[] buffer, int offset, int size)
|
|
{
|
|
if (m_stream == null || m_sock == null || !m_sock.Connected)
|
|
return false;
|
|
|
|
if (offset + size > buffer.Length)
|
|
throw new ArgumentOutOfRangeException("offset", offset, "offset + size is beyond end of buffer.");
|
|
|
|
LastActivityTimeMS = ContextTimeoutManager.EnvironmentTickCount();
|
|
|
|
bool ok = true;
|
|
ContextTimeoutManager.ContextEnterActiveSend();
|
|
lock (sendLock) // can't have overlaps here
|
|
{
|
|
try
|
|
{
|
|
m_stream.Write(buffer, offset, size);
|
|
}
|
|
catch
|
|
{
|
|
ok = false;
|
|
}
|
|
}
|
|
|
|
ContextTimeoutManager.ContextLeaveActiveSend();
|
|
if (!ok && m_stream != null)
|
|
Disconnect(SocketError.NoRecovery);
|
|
return ok;
|
|
}
|
|
|
|
public async Task<bool> SendAsync(byte[] buffer, int offset, int size)
|
|
{
|
|
if (m_stream == null || m_sock == null || !m_sock.Connected)
|
|
return false;
|
|
|
|
if (offset + size > buffer.Length)
|
|
throw new ArgumentOutOfRangeException("offset", offset, "offset + size is beyond end of buffer.");
|
|
|
|
bool ok = true;
|
|
ContextTimeoutManager.ContextEnterActiveSend();
|
|
try
|
|
{
|
|
await m_stream.WriteAsync(buffer, offset, size).ConfigureAwait(false);
|
|
}
|
|
catch
|
|
{
|
|
ok = false;
|
|
}
|
|
|
|
ContextTimeoutManager.ContextLeaveActiveSend();
|
|
|
|
if (!ok && m_stream != null)
|
|
Disconnect(SocketError.NoRecovery);
|
|
return ok;
|
|
}
|
|
|
|
/// <summary>
|
|
/// The context have been disconnected.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// Event can be used to clean up a context, or to reuse it.
|
|
/// </remarks>
|
|
public event EventHandler<DisconnectedEventArgs> Disconnected;
|
|
/// <summary>
|
|
/// A request have been received in the context.
|
|
/// </summary>
|
|
public event EventHandler<RequestEventArgs> RequestReceived;
|
|
|
|
public HTTPNetworkContext GiveMeTheNetworkStreamIKnowWhatImDoing()
|
|
{
|
|
StreamPassedOff = true;
|
|
m_parser.RequestCompleted -= OnRequestCompleted;
|
|
m_parser.RequestLineReceived -= OnRequestLine;
|
|
m_parser.HeaderReceived -= OnHeaderReceived;
|
|
m_parser.BodyBytesReceived -= OnBodyBytesReceived;
|
|
m_parser.Clear();
|
|
|
|
m_currentRequest?.Clear();
|
|
m_currentRequest = null;
|
|
m_currentResponse?.Clear();
|
|
m_currentResponse = null;
|
|
if (m_requests != null)
|
|
{
|
|
while (m_requests.Count > 0)
|
|
{
|
|
HttpRequest req = m_requests.Dequeue();
|
|
req.Clear();
|
|
}
|
|
}
|
|
m_requests.Clear();
|
|
m_requests = null;
|
|
|
|
return new HTTPNetworkContext() { Socket = m_sock, Stream = m_stream as NetworkStream };
|
|
}
|
|
|
|
public void Dispose()
|
|
{
|
|
Dispose(true);
|
|
GC.SuppressFinalize(this);
|
|
}
|
|
|
|
public void Dispose(bool disposing)
|
|
{
|
|
if (contextID >= 0)
|
|
{
|
|
StreamPassedOff = false;
|
|
Cleanup();
|
|
}
|
|
}
|
|
}
|
|
} |