예제 #1
0
        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);
        }
예제 #2
0
            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();
                }
            }