private int IsHandle(byte[] firstPacket, int length, Socket socket)
{
if (length >= 7 && _config.proxyRuleMode != (int)ProxyRuleMode.Disable)
{
IPAddress ipAddress = null;
if (firstPacket[0] == 1)
{
byte[] addr = new byte[4];
Array.Copy(firstPacket, 1, addr, 0, addr.Length);
ipAddress = new IPAddress(addr);
}
else if (firstPacket[0] == 3)
{
int len = firstPacket[1];
byte[] addr = new byte[len];
if (length >= len + 2)
{
Array.Copy(firstPacket, 2, addr, 0, addr.Length);
string host = Encoding.UTF8.GetString(firstPacket, 2, len);
if (IPAddress.TryParse(host, out ipAddress))
{
//pass
}
else
{
if ((_config.proxyRuleMode == (int)ProxyRuleMode.BypassLanAndChina || _config.proxyRuleMode == (int)ProxyRuleMode.BypassLanAndNotChina) && _IPRange != null || _config.proxyRuleMode == (int)ProxyRuleMode.UserCustom)
{
if (!IPAddress.TryParse(host, out ipAddress))
{
if (_config.proxyRuleMode == (int)ProxyRuleMode.UserCustom)
{
Shadowsocks.Model.HostMap hostMap = HostMap.Instance();
if (hostMap.GetHost(host, out var host_addr))
{
if (!string.IsNullOrEmpty(host_addr))
{
string lower_host_addr = host_addr.ToLower();
if (lower_host_addr.StartsWith("reject") ||
lower_host_addr.StartsWith("direct")
)
{
return(CONNECT_DIRECT);
}
else if (lower_host_addr.StartsWith("localproxy"))
{
return(CONNECT_LOCALPROXY);
}
else if (lower_host_addr.StartsWith("remoteproxy"))
{
return(CONNECT_REMOTEPROXY);
}
else if (lower_host_addr.IndexOf('.') >= 0 || lower_host_addr.IndexOf(':') >= 0)
{
if (!IPAddress.TryParse(lower_host_addr, out ipAddress))
{
//
}
}
}
}
}
if (ipAddress == null)
{
ipAddress = Utils.DnsBuffer.Get(host);
}
}
if (ipAddress == null)
{
ipAddress = Utils.QueryDns(host, host.IndexOf('.') >= 0 ? _config.dnsServer : null);
if (ipAddress != null)
{
Utils.DnsBuffer.Set(host, new IPAddress(ipAddress.GetAddressBytes()));
if (host.IndexOf('.') >= 0)
{
if (Utils.isLAN(ipAddress)) // assume that it is polution if return LAN address
{
return(CONNECT_REMOTEPROXY);
}
}
}
else
{
Logging.Log(LogLevel.Debug, "DNS query fail: " + host);
}
}
}
}
}
}
else if (firstPacket[0] == 4)
{
byte[] addr = new byte[16];
Array.Copy(firstPacket, 1, addr, 0, addr.Length);
ipAddress = new IPAddress(addr);
}
if (ipAddress != null)
{
if (_config.proxyRuleMode == (int)ProxyRuleMode.UserCustom)
{
Shadowsocks.Model.HostMap hostMap = HostMap.Instance();
string host_addr;
if (hostMap.GetIP(ipAddress, out host_addr))
{
string lower_host_addr = host_addr.ToLower();
if (lower_host_addr.StartsWith("reject") ||
lower_host_addr.StartsWith("direct")
)
{
return(CONNECT_DIRECT);
}
else if (lower_host_addr.StartsWith("localproxy"))
{
return(CONNECT_LOCALPROXY);
}
else if (lower_host_addr.StartsWith("remoteproxy"))
{
return(CONNECT_REMOTEPROXY);
}
}
}
else
{
if (Util.Utils.isLAN(ipAddress))
{
return(CONNECT_DIRECT);
}
if ((_config.proxyRuleMode == (int)ProxyRuleMode.BypassLanAndChina || _config.proxyRuleMode == (int)ProxyRuleMode.BypassLanAndNotChina) && _IPRange != null &&
ipAddress.AddressFamily == AddressFamily.InterNetwork
)
{
if (_IPRange.IsInIPRange(ipAddress))
{
return(CONNECT_LOCALPROXY);
}
Utils.DnsBuffer.Sweep();
}
}
}
}
return(CONNECT_REMOTEPROXY);
}
public static bool LogSocketException(string remarks, string server, Exception e)
{
if (DateTime.Now.ToString("yyyy-MM") != date)
{
OpenLogFile();
}
// just log useful exceptions, not all of them
if (e is ObfsException)
{
ObfsException oe = (ObfsException)e;
Error("Proxy server [" + remarks + "(" + server + ")] "
+ oe.Message);
return(true);
}
else if (e is NullReferenceException)
{
return(true);
}
else if (e is ObjectDisposedException)
{
// ignore
return(true);
}
else if (e is SocketException)
{
SocketException se = (SocketException)e;
if ((uint)se.SocketErrorCode == 0x80004005)
{
// already closed
return(true);
}
else if (se.ErrorCode == 11004)
{
Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
+ "DNS lookup failed");
return(true);
}
else if (se.SocketErrorCode == SocketError.HostNotFound)
{
Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
+ "Host not found");
return(true);
}
else if (se.SocketErrorCode == SocketError.ConnectionRefused)
{
Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
+ "connection refused");
return(true);
}
else if (se.SocketErrorCode == SocketError.NetworkUnreachable)
{
Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
+ "network unreachable");
return(true);
}
else if (se.SocketErrorCode == SocketError.TimedOut)
{
//Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
// + "connection timeout");
return(true);
}
else if (se.SocketErrorCode == SocketError.Shutdown)
{
return(true);
}
else
{
Logging.Log(LogLevel.Info, "Proxy server [" + remarks + "(" + server + ")] "
+ Convert.ToString(se.SocketErrorCode) + ":" + se.Message);
Debug(ToString(new StackTrace().GetFrames()));
return(true);
}
}
return(false);
}
public static bool LogSocketException(string remarks, string server, Exception e)
{
// just log useful exceptions, not all of them
if (e is ObfsException)
{
ObfsException oe = (ObfsException)e;
Logging.Log(LogLevel.Error, "Proxy server [" + remarks + "(" + server + ")] "
+ oe.Message);
return(true);
}
else if (e is ObjectDisposedException)
{
// ignore
return(true);
}
else if (e is SocketException)
{
SocketException se = (SocketException)e;
if (se.SocketErrorCode == SocketError.ConnectionAborted)
{
// closed by browser when sending
// normally happens when download is canceled or a tab is closed before page is loaded
}
else if (se.SocketErrorCode == SocketError.ConnectionReset)
{
// received rst
}
else if (se.SocketErrorCode == SocketError.NotConnected)
{
// close when not connected
}
else if ((uint)se.SocketErrorCode == 0x80004005)
{
// already closed
return(true);
}
else if (se.ErrorCode == 11004)
{
Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
+ "DNS lookup failed");
return(true);
}
else if (se.SocketErrorCode == SocketError.HostNotFound)
{
Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
+ "Host not found");
return(true);
}
else if (se.SocketErrorCode == SocketError.ConnectionRefused)
{
Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
+ "connection refused");
return(true);
}
else if (se.SocketErrorCode == SocketError.NetworkUnreachable)
{
Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
+ "network unreachable");
return(true);
}
else if (se.SocketErrorCode == SocketError.TimedOut)
{
//Logging.Log(LogLevel.Warn, "Proxy server [" + remarks + "(" + server + ")] "
// + "connection timeout");
return(true);
}
else if (se.SocketErrorCode == SocketError.Shutdown)
{
return(true);
}
else
{
Logging.Log(LogLevel.Info, "Proxy server [" + remarks + "(" + server + ")] "
+ Convert.ToString(se.SocketErrorCode) + ":" + se.Message);
//#if DEBUG
Console.WriteLine(ToString(new StackTrace().GetFrames()));
//#endif
return(true);
}
}
return(false);
}
