private int IsHandle(byte[] firstPacket, int length)
{
if (length >= 7 && _config.proxyRuleMode != ProxyRuleMode.Disable)
{
IPAddress ipAddress = null;
if (firstPacket[0] == 1)
{
var 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];
var addr = new byte[len];
if (length >= len + 2)
{
Array.Copy(firstPacket, 2, addr, 0, addr.Length);
var host = Encoding.UTF8.GetString(firstPacket, 2, len);
if (IPAddress.TryParse(host, out ipAddress))
{
//pass
}
else
{
if ((_config.proxyRuleMode == ProxyRuleMode.BypassLanAndChina || _config.proxyRuleMode == ProxyRuleMode.BypassLanAndNotChina) && _IPRange != null || _config.proxyRuleMode == ProxyRuleMode.UserCustom)
{
if (!IPAddress.TryParse(host, out ipAddress))
{
if (_config.proxyRuleMode == ProxyRuleMode.UserCustom)
{
var hostMap = HostMap.Instance();
if (hostMap.GetHost(host, out var host_addr))
{
if (!string.IsNullOrEmpty(host_addr))
{
var lower_host_addr = host_addr.ToLower();
if (lower_host_addr.StartsWith("reject") ||
lower_host_addr.StartsWith("direct")
)
{
return(CONNECT_DIRECT);
}
if (lower_host_addr.StartsWith("localproxy"))
{
return(CONNECT_LOCALPROXY);
}
if (lower_host_addr.StartsWith("remoteproxy"))
{
return(CONNECT_REMOTEPROXY);
}
if (lower_host_addr.IndexOf('.') >= 0 || lower_host_addr.IndexOf(':') >= 0)
{
if (!IPAddress.TryParse(lower_host_addr, out ipAddress))
{
//
}
}
}
}
}
if (ipAddress == null)
{
ipAddress = DnsUtil.DnsBuffer.Get(host);
}
}
if (ipAddress == null)
{
ipAddress = DnsUtil.QueryDns(host, host.IndexOf('.') >= 0 ? _config.dnsServer : null);
if (ipAddress != null)
{
DnsUtil.DnsBuffer.Set(host, new IPAddress(ipAddress.GetAddressBytes()));
if (host.IndexOf('.') >= 0)
{
if (IPSubnet.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)
{
var addr = new byte[16];
Array.Copy(firstPacket, 1, addr, 0, addr.Length);
ipAddress = new IPAddress(addr);
}
if (ipAddress != null)
{
if (_config.proxyRuleMode == ProxyRuleMode.UserCustom)
{
var hostMap = HostMap.Instance();
if (hostMap.GetIP(ipAddress, out var host_addr))
{
var lower_host_addr = host_addr.ToLower();
if (lower_host_addr.StartsWith("reject") ||
lower_host_addr.StartsWith("direct")
)
{
return(CONNECT_DIRECT);
}
if (lower_host_addr.StartsWith("localproxy"))
{
return(CONNECT_LOCALPROXY);
}
if (lower_host_addr.StartsWith("remoteproxy"))
{
return(CONNECT_REMOTEPROXY);
}
}
}
else
{
if (IPSubnet.IsLan(ipAddress))
{
return(CONNECT_DIRECT);
}
if ((_config.proxyRuleMode == ProxyRuleMode.BypassLanAndChina || _config.proxyRuleMode == ProxyRuleMode.BypassLanAndNotChina) && _IPRange != null &&
ipAddress.AddressFamily == AddressFamily.InterNetwork
)
{
if (_IPRange.IsInIPRange(ipAddress))
{
return(CONNECT_LOCALPROXY);
}
DnsUtil.DnsBuffer.Sweep();
}
}
}
}
return(CONNECT_REMOTEPROXY);
}
private void Connect()
{
try
{
IPAddress ipAddress = null;
var _targetPort = 0;
{
if (_firstPacket[0] == 1)
{
var addr = new byte[4];
Array.Copy(_firstPacket, 1, addr, 0, addr.Length);
ipAddress = new IPAddress(addr);
_targetPort = (_firstPacket[5] << 8) | _firstPacket[6];
_remote_host = ipAddress.ToString();
Logging.Info((_local_proxy ? "Local proxy" : "Direct") + " connect " + _remote_host + ":" + _targetPort);
}
else if (_firstPacket[0] == 4)
{
var addr = new byte[16];
Array.Copy(_firstPacket, 1, addr, 0, addr.Length);
ipAddress = new IPAddress(addr);
_targetPort = (_firstPacket[17] << 8) | _firstPacket[18];
_remote_host = ipAddress.ToString();
Logging.Info((_local_proxy ? "Local proxy" : "Direct") + " connect " + _remote_host + ":" + _targetPort);
}
else if (_firstPacket[0] == 3)
{
int len = _firstPacket[1];
var addr = new byte[len];
Array.Copy(_firstPacket, 2, addr, 0, addr.Length);
_remote_host = Encoding.UTF8.GetString(_firstPacket, 2, len);
_targetPort = (_firstPacket[len + 2] << 8) | _firstPacket[len + 3];
Logging.Info((_local_proxy ? "Local proxy" : "Direct") + " connect " + _remote_host + ":" + _targetPort);
//if (!_local_proxy)
{
if (!IPAddress.TryParse(_remote_host, out ipAddress))
{
if (_config.proxyRuleMode == ProxyRuleMode.UserCustom)
{
var hostMap = HostMap.Instance();
if (hostMap.GetHost(_remote_host, out var host_addr))
{
if (!string.IsNullOrEmpty(host_addr))
{
var lower_host_addr = host_addr.ToLower();
if (lower_host_addr.StartsWith("reject"))
{
Close();
return;
}
if (lower_host_addr.IndexOf('.') >= 0 || lower_host_addr.IndexOf(':') >= 0)
{
if (!IPAddress.TryParse(lower_host_addr, out ipAddress))
{
//
}
}
}
}
}
if (ipAddress == null)
{
ipAddress = DnsUtil.LocalDnsBuffer.Get(_remote_host);
}
}
if (ipAddress == null)
{
ipAddress = DnsUtil.QueryDns(_remote_host, _remote_host.IndexOf('.') >= 0 ? _config.localDnsServer : null);
}
if (ipAddress != null)
{
DnsUtil.LocalDnsBuffer.Set(_remote_host, new IPAddress(ipAddress.GetAddressBytes()));
DnsUtil.LocalDnsBuffer.Sweep();
}
else
{
if (!_local_proxy)
{
throw new SocketException((int)SocketError.HostNotFound);
}
}
}
}
_remote_port = _targetPort;
}
if (ipAddress != null && _config.proxyRuleMode == ProxyRuleMode.UserCustom)
{
var hostMap = HostMap.Instance();
if (hostMap.GetIP(ipAddress, out var host_addr))
{
var lower_host_addr = host_addr.ToLower();
if (lower_host_addr.StartsWith("reject")
)
{
Close();
return;
}
}
}
if (_local_proxy)
{
IPAddress.TryParse(_config.proxyHost, out ipAddress);
_targetPort = _config.proxyPort;
}
// ProxyAuth recv only socks5 head, so don't need to save anything else
var remoteEP = new IPEndPoint(ipAddress ?? throw new InvalidOperationException(), _targetPort);
_remote = new ProxySocketTun(ipAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
_remote.GetSocket().NoDelay = true;
// Connect to the remote endpoint.
_remote.BeginConnect(remoteEP, ConnectCallback, null);
}
catch (Exception e)
{
Logging.LogUsefulException(e);
Close();
}
}