/// <summary>
/// Close broken sockets
/// </summary>
/// <remarks>
/// This function is called regularly to clean up the list of
/// connected sockets.
/// </remarks>
void CheckSockets(object eventState)
{
try
{
lock (ConnectedSockets)
{
foreach (var kv in ConnectedSockets)
{
try
{
int id = kv.Key;
HttpSocket state = kv.Value;
if (state == null || state.IsSocketDead())
{
ConnectedSockets.Remove(id);
}
}
catch (Exception e)
{
//log.Error(e);
}
}
}
}
catch { }
}
internal void SendTo(HttpSocket hs)
{
hs.WriteAsciiLine(HeadersInOrder);
// Note: HeadersInOrder contains one trailing newline, so
// WriteAsciiLine() will send two newlines (which is what we
// want).
}
/// <summary>
/// Transfer data from this socket to the destination socket
/// until this socket closes
/// </summary>
/// <returns>The number of bytes sent</returns>
public uint TunnelDataTo(HttpSocket dest)
{
uint total_sent = 0;
try
{
if (AvailableData == 0)
{
ReadRaw();
}
while (AvailableData > 0)
{
uint sent = dest.WriteBinary(Buffer, BufferPosition,
AvailableData);
if (sent < AvailableData)
{
throw new IoBroken();
}
total_sent += sent;
ReadRaw();
}
}
catch (SocketException) { /* ignore */ }
return(total_sent);
}
/// <summary>
/// Tunnel a HTTP-chunked blob of data
/// </summary>
/// <param name="dest">The destination socket</param>
/// <remarks>
/// The tunneling stops when the last chunk, identified by a
/// size of 0, arrives. The optional trailing entities are also
/// transmitted (but otherwise ignored).
/// </remarks>
public void TunnelChunkedDataTo(HttpSocket dest)
{
TunnelChunkedDataTo(dest, (byte[] b, uint o, uint s) =>
{
if (dest.WriteBinary(b, o, s) < s)
{
throw new IoBroken();
}
});
}
/// <summary>
/// Read <c>nb_bytes</c> bytes from the socket,
/// and send it to the destination socket
/// </summary>
/// <returns>The number of bytes sent</returns>
public uint TunnelDataTo(HttpSocket dest, uint nb_bytes)
{
return(TunnelDataTo((byte[] b, uint o, uint s) =>
{
if (dest.WriteBinary(b, o, s) < s)
{
throw new IoBroken();
}
}, nb_bytes));
}
/// <summary>
/// Remove the socket contained in the given state object
/// from the connected array list and hash table, then close the
/// socket
/// </summary>
virtual protected void CloseSocket(HttpSocket state)
{
HttpSocket actual_state;
lock (ConnectedSockets)
{
if (!ConnectedSockets.TryGetValue(state.id, out actual_state))
{
return;
}
System.Diagnostics.Debug.Assert(actual_state == state);
ConnectedSockets.Remove(state.id);
}
state.CloseSocket();
}
internal HttpRequestLine(HttpSocket hs)
{
string line;
do
{
line = hs.ReadAsciiLine().Trim();
}while (line.Length == 0);
string[] items = line.Split(sp,
StringSplitOptions.RemoveEmptyEntries);
if (items.Length != 3)
{
throw new HttpProtocolBroken("Unrecognized request line '" +
line + "'");
}
RequestLine = line;
Method = items[0];
URI = items[1];
ProtocolVersion = ParserHelper.ParseProtocolVersion(items[2]);
}
internal HttpStatusLine(HttpSocket hs)
{
string line;
do
{
line = hs.ReadAsciiLine().Trim();
}while (line.Length == 0);
string[] items = line.Split(sp,
StringSplitOptions.RemoveEmptyEntries);
// Note: the status line has three items: the HTTP protocol
// version, the status code, and the reason phrase.
// Only the reason phrase may be empty.
if (items.Length < 2)
{
throw new HttpProtocolBroken("Unrecognized status line '" +
line + "'");
}
ProtocolVersion = ParserHelper.ParseProtocolVersion(
items[0]);
string code = items[1];
if (code.Length != 3 ||
!char.IsDigit(code[0])) // we only test the first character
{
throw new HttpProtocolBroken("Invalid status code '" +
code + "'");
}
//string Reason = rest of the string; // we don't need it
StatusCode = int.Parse(code);
StatusLine = line;
}
/// <summary>
/// Read and parse HTTP headers from a connected socket
/// </summary>
public HttpHeaders(HttpSocket source) : this()
{
StringBuilder sb = new StringBuilder(512);
while (true)
{
var line = source.ReadAsciiLine();
if (line.Length == 0)
{
break;
}
sb.Append(line);
sb.Append("\r\n"); // Note: if the header newline was
// incorrectly formatted (i.e. LF instead of CRLF),
// we correct it here. This is one point where our
// proxy is not fully transparent.
var iSplit = line.IndexOf(':');
if (iSplit <= 0)
{
throw new HttpProtocolBroken("No colon in HTTP header");
}
// Header names are case-insensitive, but only some header
// values are.
string HeaderName = line.Substring(0, iSplit).Trim().ToLower();
string HeaderValue = line.Substring(iSplit + 1).Trim();
if (IsHeaderValueCaseInsensitive(HeaderName))
{
HeaderValue = HeaderValue.ToLower();
}
string previous_value = null;
if (Headers.TryGetValue(HeaderName, out previous_value))
{
// Duplicate headers: concatenate them
// (RFC 2616, section 4.2)
// However, this should only occur if the value of that
// header is a comma-separated list. In the real world,
// it has been observed that headers with
// non-comma-separated values, such as Content-Length, *are*
// in some rare cases repeated, so we should not concatenate
// the values.
if (!HeaderName.Equals("content-length"))
{
Headers[HeaderName] = previous_value + "," + HeaderValue;
}
}
else
{
Headers[HeaderName] = HeaderValue;
}
}
HeadersInOrder = sb.ToString();
// Parse a subset of the header values.
// If headers are added, don't forget to update RemoveHeader
// as well.
Connection = ParseMultipleStringValues("connection");
ContentEncoding = ParseStringValue("content-encoding");
ContentLength = ParseIntValue("content-length");
Host = ParseStringValue("host");
ProxyConnection = ParseMultipleStringValues("proxy-connection");
Referer = ParseStringValue("referer");
TransferEncoding = ParseMultipleStringValues("transfer-encoding");
}
internal void SendTo(HttpSocket hs)
{
hs.WriteAsciiLine(StatusLine);
}
/// <summary>
/// Callback method for accepting new connections
/// </summary>
void AcceptCallback(IAsyncResult ar)
{
if (IsShuttingDown)
{
return;
}
// Have we really changed thread?
if (ListeningThread.ManagedThreadId ==
System.Threading.Thread.CurrentThread.ManagedThreadId)
{
// No! Give me a new thread!
new Thread(() => AcceptCallback(ar)).Start();
return;
}
// Get the socket that handles the client request
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
// Signal the main thread to continue
ListenThreadSwitch.Set();
#if DEBUG_ACCEPT_CONNECTION
log.Debug("\tAcceptCallback sent signal");
#endif
// Create the state object
HttpSocket state = new HttpSocket(handler);
state.id = ++LastClientId;
lock (ConnectedSockets)
ConnectedSockets[state.id] = state;
AbstractProxyLogic proxy = null;
try
{
proxy = OnClientStart(state);
} catch (Exception e) {
// log.Error(e);
}
if (proxy == null)
{
CloseSocket(state);
return;
}
// No need for asynchronous I/O from now on
try
{
while (proxy.LogicLoop())
{
if (IsShuttingDown || state.IsSocketDead())
{
break;
}
}
//log.Debug("Shutting down socket");
}
catch (System.Net.Sockets.SocketException) { /* ignore */ }
catch (GhostLib.Network.Proxy.IoBroken) { /* ignore */ }
catch (Exception e)
{
// log.Error(e);
// log.Debug("Closing socket on error");
}
CloseSocket(state);
}
/* Helper function */
void TunnelChunkedDataTo(HttpSocket dest, MessagePacketHandler mph)
{
// (RFC 2616, sections 3.6.1, 19.4.6)
while (true)
{
string chunk_header = ReadAsciiLine();
if (chunk_header.Length == 0)
{
throw new HttpProtocolBroken(
"Expected chunk header missing");
}
int sc = chunk_header.IndexOfAny(c_ChunkSizeEnd);
string hexa_size;
if (sc > -1)
{
// We have chunk extensions: ignore them
hexa_size = chunk_header.Substring(0, sc);
}
else
{
hexa_size = chunk_header;
}
uint size;
try
{
size = Convert.ToUInt32(hexa_size, 16);
}
catch
{
string s = chunk_header.Length > 20
? (chunk_header.Substring(0, 17) + "...")
: chunk_header;
throw new HttpProtocolBroken(
"Could not parse chunk size in: " + s);
}
if (dest != null)
{
dest.WriteAsciiLine(chunk_header);
}
if (size == 0)
{
break;
}
TunnelDataTo(mph, size);
// Read/write one more CRLF
string new_line = ReadAsciiLine();
System.Diagnostics.Debug.Assert(new_line.Length == 0);
if (dest != null)
{
dest.WriteAsciiLine(new_line);
}
}
string line;
do
{
// Tunnel any trailing entity headers
line = ReadAsciiLine();
if (dest != null)
{
dest.WriteAsciiLine(line);
}
} while (line.Length != 0);
}
/// <summary>
/// If necessary, connect the remote <c>SocketPS</c> socket
/// to the given host and port
/// </summary>
/// <param name="hostname">Remote host name</param>
/// <param name="port">Remote port</param>
/// <remarks>
/// If SocketPS is already connected to the right host and port,
/// the socket is reused as is.
/// </remarks>
protected void Connect(string hostname, int port)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(hostname));
System.Diagnostics.Debug.Assert(port > 0);
if (DestinationHostName != null &&
DestinationHostName.Equals(hostname) &&
DestinationPort == port &&
(SocketPS != null && !SocketPS.IsSocketDead()))
{
// Nothing to do, just reuse the socket
return;
}
if (SocketPS != null)
{
//log.Debug("Changing hostname/port from " +
// DestinationHostName + ":" + DestinationPort +
// " to " + hostname + ":" + port);
// We have a socket connected to the wrong host (or port)
SocketPS.CloseSocket();
SocketPS = null;
}
IPAddress[] ips = Resolve(hostname);
Socket socket = null;
Exception e = null;
foreach (var ip in ips)
{
try
{
socket = new Socket(ip.AddressFamily, SocketType.Stream,
ProtocolType.Tcp);
socket.Connect(ip, port);
break;
}
catch (Exception ee)
{
if (ip.Equals(IPAddress.IPv6Loopback))
{
// Do not log that
continue;
}
if (e == null)
{
e = ee;
}
if (socket != null)
{
socket.Close();
socket = null;
}
//log.Error(ee);
}
}
if (socket == null)
{
throw e;
}
// Checked up, and good to go
SocketPS = new HttpSocket(socket);
DestinationHostName = hostname;
DestinationPort = port;
//log.Debug("SocketPS connected to " + hostname + ":" + port);
}
/// <summary>
/// Common constructor for proxies; one proxy instance is created
/// per client connection
/// </summary>
/// <param name="socketBP">Client socket</param>
protected AbstractProxyLogic(HttpSocket socketBP)
{
System.Diagnostics.Debug.Assert(socketBP != null);
SocketBP = socketBP;
SocketPS = null;
}
internal void SendTo(HttpSocket hs)
{
hs.WriteAsciiLine(RequestLine);
}
