/// <summary>
/// 客户端接收到数据
/// </summary>
/// <param name="tcpClient"></param>
/// <param name="saea"></param>
/// <param name="clientErrorType"></param>
private void OnReceive(HHTcpClient tcpClient, SocketAsyncEventArgs saea, ClientErrorType clientErrorType)
{
if (clientErrorType != ClientErrorType.Success)
{
Close(clientErrorType);
return;
}
if (HttpProxySessionInfo.HeadLength == -1)//尚为解析协议头
{
if (HttpProxySessionInfo.MemoryStream == null)
{
HttpProxySessionInfo.MemoryStream = new System.IO.MemoryStream();
}
HttpProxySessionInfo.MemoryStream.Write(saea.Buffer, saea.Offset, saea.BytesTransferred);
ToParseQuery();//解析协议头
}
else
{
if (DSsaea == null)
{
DSsaea = new SocketAsyncEventArgs();
}
//直接转发就行了
DSsaea.SetBuffer(saea.Buffer, saea.Offset, saea.BytesTransferred);
if (!desTcpCliet.BeginSend(DSsaea, out var errorType))
{
Close(errorType);
}
}
}
/// <summary>
/// 解析协议头
/// </summary>
private void ToParseQuery()
{
#region 解析协议头
string aBin = Encoding.UTF8.GetString(HttpProxySessionInfo.MemoryStream.ToArray());
int index, indexbe, lastindex, onLine;
index = aBin.IndexOf("\r\n\r\n");
if (index == -1)
{
if (aBin.Length > 102400)//数据大于100k还没解析出协议头 关闭
{
Close(ClientErrorType.OtherError);
}
else if (!cTcpClient.BeginReceive(Rsaea, out ClientErrorType clientErrorType))
{
Close(ClientErrorType.OtherError);
}
return;
}
HttpProxySessionInfo.HeadLength = index + 4;
if (aBin.Length != HttpProxySessionInfo.HeadLength)
{
aBin = Encoding.UTF8.GetString(HttpProxySessionInfo.MemoryStream.ToArray(), 0, HttpProxySessionInfo.HeadLength);
}
//解析访问方式
index = aBin.IndexOf(' ');
if (index == -1 || index > 10)
{
//解析访问方式错误
Close(ClientErrorType.OtherError);
return;
}
HttpProxySessionInfo.HttpRequestType = aBin.Substring(0, index);
//解析协议版本
lastindex = aBin.IndexOf("\r\n", index);
if (lastindex == -1)
{
//协议头错误
Close(ClientErrorType.OtherError);
return;
}
onLine = lastindex;
indexbe = aBin.LastIndexOf(' ', lastindex);
if (indexbe == -1)
{
//协议头错误
Close(ClientErrorType.OtherError);
return;
}
HttpProxySessionInfo.HttpVersion = aBin.Substring(indexbe + 1, lastindex - indexbe - 1);
HttpProxySessionInfo.HttpPath = aBin.Substring(index + 1, indexbe - index - 1);
//解析host
string hostUrl = string.Empty;
//CONNECT
if ("CONNECT" == HttpProxySessionInfo.HttpRequestType)
{
hostUrl = HttpProxySessionInfo.HttpPath;
}
else
{
index = aBin.IndexOf("Host: ");
if (index == -1)
{
//协议头错误
Close(ClientErrorType.OtherError);
return;
}
index += 6;
lastindex = aBin.IndexOf("\r\n", index);
if (lastindex == -1)
{
//协议头错误
Close(ClientErrorType.OtherError);
return;
}
hostUrl = aBin.Substring(index, lastindex - index);
}
if (string.IsNullOrEmpty(hostUrl))
{
//协议头错误
Close(ClientErrorType.OtherError);
return;
}
string[] ho = hostUrl.Split(':');
HttpProxySessionInfo.Host = ho[0];
if (ho.Length > 2)
{
//协议头错误
Close(ClientErrorType.OtherError);
return;
}
if (ho.Length == 2)
{
if (ushort.TryParse(ho[1], out ushort pro))
{
HttpProxySessionInfo.Port = pro;
}
else//错误的端口
{
Close(ClientErrorType.OtherError);
return;
}
}
else
{
if ("CONNECT" == HttpProxySessionInfo.HttpRequestType)
{
HttpProxySessionInfo.Port = 443;
}
else
{
HttpProxySessionInfo.Port = 80;
}
}
#endregion
if (!IPAddress.TryParse(HttpProxySessionInfo.Host, out IPAddress ipaddr))
{
try
{
IPAddress[] iplist = Dns.GetHostAddresses(HttpProxySessionInfo.Host);
if (iplist != null && iplist.Length > 0)
{
ipaddr = iplist[0];
}
else
{
//无法解析host
Close(ClientErrorType.OtherError);
return;
}
}
catch (Exception)
{
//无法解析host
Close(ClientErrorType.OtherError);
return;
}
}
byte[] ipBytes = ipaddr.GetAddressBytes();//尝试访问局域网
if (ipBytes[0] == 10 || (ipBytes[0] == 172 && ipBytes[1] >= 16 && ipBytes[1] <= 31) || (ipBytes[0] == 192 && ipBytes[1] == 168))
{
//尝试访问局域网
Close(ClientErrorType.Danger);
return;
}
if (ipBytes[0] == 127 && ipBytes[1] == 0 && ipBytes[2] == 0 && ipBytes[3] == 1 && HttpProxySessionInfo.Port != 57869)
{
//尝试访问本地其他端口
Close(ClientErrorType.Danger);
return;
}
IPEndPoint localEndPoint = new IPEndPoint(ipaddr, HttpProxySessionInfo.Port);
Socket socket = new Socket(localEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
if (localEndPoint.AddressFamily == AddressFamily.InterNetworkV6)
{
socket.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)27, false);
}
//if (aBin.IndexOf("\r\nProxy-Connection: Keep-Alive\r\n", StringComparison.OrdinalIgnoreCase) != -1 || aBin.IndexOf("\r\nConnection: Keep-Alive\r\n") != -1)
//{
// socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
//}
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.DontLinger, true);
IAsyncResult waitcon = socket.BeginConnect(localEndPoint, null, null);
if (!waitcon.AsyncWaitHandle.WaitOne(15000))
{
//无法连接host
Close(ClientErrorType.OtherError);
return;
}
desTcpCliet = new HHTcpClient(socket);
desTcpCliet.OnError += DOnError;
desTcpCliet.OnReceive += DOnReceive;
desTcpCliet.OnSendEnd += DOnSendEnd;
if ("CONNECT" == HttpProxySessionInfo.HttpRequestType)
{
//先发送
if (Ssaea == null)
{
Ssaea = new SocketAsyncEventArgs();
}
byte[] bin = Encoding.UTF8.GetBytes($"{HttpProxySessionInfo.HttpVersion} 200 Connection established\r\nProxy-Agent: Mentalis Proxy Server\r\n\r\n");
Ssaea.SetBuffer(bin, 0, bin.Length);
if (!cTcpClient.BeginSend(Ssaea, out _))
{
Close(ClientErrorType.OtherError);
return;
}
}
else
{
//http协议 重组包
if (HttpProxySessionInfo.HttpPath.Length >= 7 && HttpProxySessionInfo.HttpPath.Substring(0, 7).ToLower().Equals("http://"))
{
index = HttpProxySessionInfo.HttpPath.IndexOf('/', 7);
if (index == -1)
{
HttpProxySessionInfo.HttpPath = "/";
}
else
{
HttpProxySessionInfo.HttpPath = HttpProxySessionInfo.HttpPath.Substring(index);
}
}
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append($"{HttpProxySessionInfo.HttpRequestType} {HttpProxySessionInfo.HttpPath} {HttpProxySessionInfo.HttpVersion}\r\n");
string[] heads = aBin.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
//排除掉第一行
for (int i = 1; i < heads.Length; i++)
{
if (heads[i].Length > 18 && heads[i].Substring(0, 16).ToLower() == "proxy-connection")
{
if (heads[i].Substring(18).ToLower() == "keep-alive")
{
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
}
heads[i] = $"Connection: " + heads[i].Substring(18);
}
else if (heads[i].Length > 12 && heads[i].Substring(0, 10).ToLower() == "connection")
{
if (heads[i].Substring(12).ToLower() == "keep-alive")
{
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
}
}
stringBuilder.Append(heads[i]);
stringBuilder.Append("\r\n");
}
stringBuilder.Append("\r\n");
//if (aBin.IndexOf("\r\nProxy-Connection: Keep-Alive\r\n") == -1)
//{
// stringBuilder.Append(aBin.Substring(onLine, HttpProxySessionInfo.HeadLength - onLine));
//}
//else
//{
// stringBuilder.Append(aBin.Substring(onLine, HttpProxySessionInfo.HeadLength - onLine).Replace("\r\nProxy-Connection: Keep-Alive\r\n", "\r\nConnection: Keep-Alive\r\n"));
//}
//是否有非头数据
byte[] bin;
if (HttpProxySessionInfo.MemoryStream.Length > HttpProxySessionInfo.HeadLength)
{
bin = new byte[stringBuilder.Length + HttpProxySessionInfo.MemoryStream.Length - HttpProxySessionInfo.HeadLength];
Encoding.UTF8.GetBytes(stringBuilder.ToString()).CopyTo(bin, 0);
HttpProxySessionInfo.MemoryStream.Position = HttpProxySessionInfo.HeadLength;
HttpProxySessionInfo.MemoryStream.Read(bin, stringBuilder.Length, (int)HttpProxySessionInfo.MemoryStream.Length - HttpProxySessionInfo.HeadLength);
}
else
{
bin = Encoding.UTF8.GetBytes(stringBuilder.ToString());
}
Console.WriteLine(Encoding.UTF8.GetString(bin));
//if (HttpProxySessionInfo.HttpPath.IndexOf("http://") == 0)//需要重组头部
//{
// index = HttpProxySessionInfo.HttpPath.IndexOf('/', 7);
// if (index == -1)
// HttpProxySessionInfo.HttpPath = "/";
// else
// HttpProxySessionInfo.HttpPath = HttpProxySessionInfo.HttpPath.Substring(index);
// bin = Encoding.UTF8.GetBytes($"{HttpProxySessionInfo.HttpRequestType} {HttpProxySessionInfo.HttpPath} {HttpProxySessionInfo.HttpVersion}{aBin.Substring(onLine, HttpProxySessionInfo.HeadLength - onLine)}");
//}
//else
//{
// //Proxy-Connection: Keep-Alive
// if (aBin.IndexOf("\r\nProxy-Connection: Keep-Alive\r\n") != -1)
// {
// bin = Encoding.UTF8.GetBytes(aBin.Replace("\r\nProxy-Connection: Keep-Alive\r\n", "\r\nConnection: Keep-Alive\r\n"));
// }
// else
// {
// bin = HttpProxySessionInfo.MemoryStream.ToArray();
// }
//}
//http 发送所有数据给目标
if (DSsaea == null)
{
DSsaea = new SocketAsyncEventArgs();
}
DSsaea.SetBuffer(bin, 0, bin.Length);
if (!desTcpCliet.BeginSend(DSsaea, out var errorType))
{
Close(errorType);
return;
}
}
}