public override bool Handle(byte[] firstPacket, int length, Socket socket, object state)
{
if (socket.ProtocolType != ProtocolType.Tcp)
{
return(false);
}
try
{
string request = Encoding.UTF8.GetString(firstPacket, 0, length);
string[] lines = request.Split('\r', '\n');
bool hostMatch = false, pathMatch = false, useSocks = false;
bool secretMatch = PacSecret.IsNullOrEmpty();
foreach (string line in lines)
{
string[] kv = line.Split(new char[] { ':' }, 2);
if (kv.Length == 2)
{
if (kv[0] == "Host")
{
if (kv[1].Trim() == ((IPEndPoint)socket.LocalEndPoint).ToString())
{
hostMatch = true;
}
}
//else if (kv[0] == "User-Agent")
//{
// // we need to drop connections when changing servers
// if (kv[1].IndexOf("Chrome") >= 0)
// {
// useSocks = true;
// }
//}
}
else if (kv.Length == 1)
{
if (line.IndexOf("pac", StringComparison.Ordinal) >= 0)
{
pathMatch = true;
}
if (!secretMatch)
{
if (line.IndexOf(PacSecret, StringComparison.Ordinal) >= 0)
{
secretMatch = true;
}
}
}
}
if (hostMatch && pathMatch)
{
if (!secretMatch)
{
socket.Close(); // Close immediately
}
else
{
SendResponse(socket, useSocks);
}
return(true);
}
return(false);
}
catch (ArgumentException)
{
return(false);
}
}
public override bool Handle(byte[] firstPacket, int length, Socket socket, object state)
{
if (socket.ProtocolType != ProtocolType.Tcp)
{
return(false);
}
try
{
/*
* RFC 7230
*
* GET /hello.txt HTTP/1.1
* User-Agent: curl/7.16.3 libcurl/7.16.3 OpenSSL/0.9.7l zlib/1.2.3
* Host: www.example.com
* Accept-Language: en, mi
*/
string request = Encoding.UTF8.GetString(firstPacket, 0, length);
string[] lines = request.Split('\r', '\n');
bool hostMatch = false, pathMatch = false, useSocks = false;
bool secretMatch = PacSecret.IsNullOrEmpty();
if (lines.Length < 2) // need at lease RequestLine + Host
{
return(false);
}
// parse request line
string requestLine = lines[0];
// GET /pac?t=yyyyMMddHHmmssfff&secret=foobar HTTP/1.1
string[] requestItems = requestLine.Split(' ');
if (requestItems.Length == 3 && requestItems[0] == "GET")
{
int index = requestItems[1].IndexOf('?');
if (index < 0)
{
index = requestItems[1].Length;
}
string resourceString = requestItems[1].Substring(0, index).Remove(0, 1);
if (string.Equals(resourceString, RESOURCE_NAME, StringComparison.OrdinalIgnoreCase))
{
pathMatch = true;
if (!secretMatch)
{
string queryString = requestItems[1].Substring(index);
if (queryString.Contains(PacSecret))
{
secretMatch = true;
}
}
}
}
// parse request header
for (int i = 1; i < lines.Length; i++)
{
if (string.IsNullOrEmpty(lines[i]))
{
continue;
}
string[] kv = lines[i].Split(new char[] { ':' }, 2);
if (kv.Length == 2)
{
if (kv[0] == "Host")
{
if (kv[1].Trim() == ((IPEndPoint)socket.LocalEndPoint).ToString())
{
hostMatch = true;
}
}
//else if (kv[0] == "User-Agent")
//{
// // we need to drop connections when changing servers
// if (kv[1].IndexOf("Chrome") >= 0)
// {
// useSocks = true;
// }
//}
}
}
if (hostMatch && pathMatch)
{
if (!secretMatch)
{
socket.Close(); // Close immediately
}
else
{
SendResponse(socket, useSocks);
}
return(true);
}
return(false);
}
catch (ArgumentException)
{
return(false);
}
}
