private void RecvFirstByteCompleted(SocketOperationResult result)
{
if (result.actualSize != 1)
{
this.Stop();
return;
}
byte firstByte = result.buf[0];
this.mProxyFirstByte = (int)firstByte;
bool firstByteOK = this.InvokeProxyEventCallback(this.ProxyFirstByteFilter);
if (firstByteOK)
{
if (firstByte > 5)
{
this.StartHttpProxy(firstByte);
return;
}
else if (5 == firstByte)
{
if (!this.mUseHttpOnly)
{
this.StartSocks5Proxy();
return;
}
}
//
}
this.Stop();
}
private void RecvSocks5MethodListCompleted(SocketOperationResult result)
{
int nMethod = result.actualSize;
if (nMethod != result.size)
{
this.Stop();
return;
}
bool methodAccepted = false;
for (int i = 0; i < nMethod; ++i)
{
if (0 == this.mBuffer1[i])
{
methodAccepted = true;
break;
}
//
}
if (!methodAccepted)
{
this.Stop();
return;
}
this.mBuffer1[0] = 5;
this.mBuffer1[1] = 0;
SocketSend(this.mSock1, this.mBuffer1, 0, 2, this.SendSocks5MethodAcceptCompleted, null);
}
private void ForwardClientFirstDataCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.Stop();
return;
}
this.StartProxyTransfer();
}
private void SendHttpConnectMethodAcceptCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.Stop();
return;
}
this.StartProxy();
}
private void SendHttpResponseHeaderCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.Stop();
return;
}
byte[] buf = this.mHttpResponseData;
SocketSend(this.mSock1, buf, 0, buf.Length, this.SendHttpResponseDataCompleted, null);
}
private void SendHttpResponseDataCompleted(SocketOperationResult result)
{
try
{
this.mSock1.Shutdown(SocketShutdown.Both);
}
catch (Exception)
{
//
}
this.PendingStop();
}
private void RecvSocks5MethodCountCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.Stop();
return;
}
int methodCount = (int)this.mBuffer1[0];
SocketRecv(this.mSock1, this.mBuffer1, 0, methodCount, true, this.RecvSocks5MethodListCompleted, null);
}
private void PairedSockFwdCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.PendingStop();
return;
}
bool direction1To2 = (bool)result.state;
this.PairedSocketTransfer(direction1To2);
}
private static SocketOperationResult PrepareSocketOperationResult(Socket sock, bool directionOut, byte[] buf, int offset, int size, bool waitAll, SocketOperationCallback callback, object state)
{
SocketOperationResult result = new SocketOperationResult();
result.sock = sock;
result.directionOut = directionOut;
result.buf = buf;
result.offset = offset;
result.size = size;
result.waitAll = waitAll;
result.callback = callback;
result.state = state;
return(result);
}
private void RecvSocks5DstAddrDataCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.Stop();
return;
}
int offset = 4;
int addrType = (int)this.mBuffer1[3];
if (1 == addrType || 4 == addrType)
{
byte[] addrBytes = null;
if (1 == addrType)
{
addrBytes = new byte[4];
}
else
{
addrBytes = new byte[16];
}
Array.Copy(this.mBuffer1, offset, addrBytes, 0, addrBytes.Length);
offset += addrBytes.Length;
IPAddress addr = new IPAddress(addrBytes);
this.mProxyDstHost = addr.ToString();
}
else if (3 == addrType)
{
int addrLen = (int)this.mBuffer1[4];
this.mProxyDstHost = Encoding.ASCII.GetString(this.mBuffer1, 5, addrLen);
offset += (addrLen + 1);
}
this.mProxyDstPort = (int)this.mBuffer1[offset++];
this.mProxyDstPort <<= 8;
this.mProxyDstPort += (int)this.mBuffer1[offset];
for (int i = 0; i < 10; ++i)
{
this.mBuffer1[i] = 0;
}
this.mBuffer1[0] = 5;
this.mBuffer1[3] = 1;
SocketSend(this.mSock1, this.mBuffer1, 0, 10, this.SendSocks5RequestAcceptCompleted, null);
}
private void SendSocks5RequestAcceptCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.Stop();
return;
}
if (!this.PreprocessProxyRemoteConnection())
{
return;
}
this.StartProxy();
}
private static void InvokeSocketOperationCallback(SocketOperationResult result)
{
SocketOperationCallback callback = result.callback;
if (null == callback)
{
return;
}
try
{
callback(result);
}
catch (Exception)
{
}
}
private void RecvPartialHttpHdrCompleted(SocketOperationResult result)
{
int n = result.actualSize;
if (n <= 0)
{
this.Stop();
return;
}
bool httpHdrEnd = false;
for (int i = 0; i < n; ++i)
{
this.mRawHttpRequestHdr += (char)this.mBuffer1[i];
if (this.mRawHttpRequestHdr.EndsWith("\r\n\r\n", StringComparison.Ordinal))
{
this.mFirstBufferLen = n;
this.mFirstBufferOffset = i + 1;
httpHdrEnd = true;
break;
}
}
if (null == this.mHttpRequestHdrFirstLine)
{
this.ProcessHttpRequestHeaderFirstLine();
}
if (httpHdrEnd)
{
this.ProcessHttpRequestHeader();
}
else
{
if (this.mRawHttpRequestHdr.Length < HttpHeaderMaxLength)
{
this.RecvHttpHdrNext();
}
else
{
this.Stop();
}
}
//
}
private static void SendRecvNext(SocketOperationResult result)
{
bool waitAll = result.waitAll;
int actualSize = result.actualSize;
int remain = result.size - actualSize;
if ((waitAll && remain <= 0) || (!waitAll && result.lastBytes > 0))
{
InvokeSocketOperationCallback(result);
return;
}
bool ok = false;
byte[] buf = result.buf;
int offset = result.offset + actualSize;
Socket sock = result.sock;
try
{
if (result.directionOut)
{
sock.BeginSend(buf, offset, remain, SocketFlags.None, SendRecvPartialCompleted, result);
}
else
{
sock.BeginReceive(buf, offset, remain, SocketFlags.None, SendRecvPartialCompleted, result);
}
ok = true;
}
catch (Exception)
{
//
}
if (!ok)
{
result.lastBytes = -1;
InvokeSocketOperationCallback(result);
}
//
}
private void PairedSockRecvCompleted(SocketOperationResult result)
{
int n = result.actualSize;
if (n <= 0)
{
this.PendingStop();
return;
}
bool direction1To2 = (bool)result.state;
byte[] buf = result.buf;
Socket sock = this.mSock2;
if (!direction1To2)
{
sock = this.mSock1;
}
SocketSend(sock, buf, 0, n, this.PairedSockFwdCompleted, direction1To2);
}
private void RecvSocks5RequestCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.Stop();
return;
}
if (1 != this.mBuffer1[1])
{
this.Stop();
return;
}
int addrLen = 0;
int addrType = (int)this.mBuffer1[3];
if (1 == addrType)
{
addrLen = 3;
}
else if (3 == addrType)
{
addrLen = (int)this.mBuffer1[4];
}
else if (4 == addrType)
{
addrLen = 15;
}
if (addrLen <= 0)
{
this.Stop();
return;
}
addrLen += 2;
SocketRecv(this.mSock1, this.mBuffer1, 5, addrLen, true, this.RecvSocks5DstAddrDataCompleted, null);
}
private static void SendRecvPartialCompleted(IAsyncResult iar)
{
SocketOperationResult result = iar.AsyncState as SocketOperationResult;
if (null == result)
{
return;
}
int n = 0;
Socket sock = result.sock;
try
{
if (result.directionOut)
{
n = sock.EndSend(iar);
}
else
{
n = sock.EndReceive(iar);
}
}
catch (Exception)
{
//
}
result.lastBytes = n;
if (n <= 0)
{
InvokeSocketOperationCallback(result);
return;
}
result.actualSize += n;
SendRecvNext(result);
}
private void RecvHttpRequestDataCompleted(SocketOperationResult result)
{
if (result.actualSize != result.size)
{
this.Stop();
return;
}
this.mHttpResponseData = null;
if (!this.InvokeProxyEventCallback(this.HttpRequestDataUserHandler))
{
this.Stop();
return;
}
if (null == this.mHttpResponseData || 0 == this.mHttpResponseData.Length)
{
this.Stop();
return;
}
StringBuilder sb = new StringBuilder();
sb.Append(this.mHttpRequestVersion);
sb.Append(" 200 OK\r\n");
sb.Append("Server: nginx\r\n");
sb.Append("Content-Length: ");
sb.Append(this.mHttpResponseData.Length.ToString());
sb.Append("\r\n");
sb.Append("Connection: close\r\n");
sb.Append("\r\n");
string hdr = sb.ToString();
byte[] buf = Encoding.ASCII.GetBytes(hdr);
SocketSend(this.mSock1, buf, 0, buf.Length, this.SendHttpResponseHeaderCompleted, null);
}
private void SendSocks5MethodAcceptCompleted(SocketOperationResult result)
{
SocketRecv(this.mSock1, this.mBuffer1, 0, 5, true, this.RecvSocks5RequestCompleted, null);
}
private static void SocketRecv(Socket sock, byte[] buf, int offset, int size, bool waitAll, SocketOperationCallback callback, object state)
{
SocketOperationResult result = PrepareSocketOperationResult(sock, false, buf, offset, size, waitAll, callback, state);
SendRecvNext(result);
}
private static void SocketSend(Socket sock, byte[] buf, int offset, int size, SocketOperationCallback callback, object state)
{
SocketOperationResult result = PrepareSocketOperationResult(sock, true, buf, offset, size, true, callback, state);
SendRecvNext(result);
}
