package scenarios

import (
	"crypto/rand"
	"sync"
	"testing"
	"time"

	"v2ray.com/core"
	"v2ray.com/core/app/log"
	"v2ray.com/core/app/proxyman"
	"v2ray.com/core/common/compare"
	clog "v2ray.com/core/common/log"
	"v2ray.com/core/common/net"
	"v2ray.com/core/common/protocol"
	"v2ray.com/core/common/serial"
	"v2ray.com/core/common/uuid"
	"v2ray.com/core/proxy/dokodemo"
	"v2ray.com/core/proxy/freedom"
	"v2ray.com/core/proxy/vmess"
	"v2ray.com/core/proxy/vmess/inbound"
	"v2ray.com/core/proxy/vmess/outbound"
	"v2ray.com/core/testing/servers/tcp"
	"v2ray.com/core/testing/servers/udp"
	"v2ray.com/core/transport/internet"
	"v2ray.com/core/transport/internet/kcp"
	. "v2ray.com/ext/assert"
)

func TestVMessDynamicPort(t *testing.T) {
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id: userID.String(),
							}),
						},
					},
					Detour: &inbound.DetourConfig{
						To: "detour",
					},
				}),
			},
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: &net.PortRange{
						From: uint32(serverPort + 1),
						To:   uint32(serverPort + 100),
					},
					Listen: net.NewIPOrDomain(net.LocalHostIP),
					AllocationStrategy: &proxyman.AllocationStrategy{
						Type: proxyman.AllocationStrategy_Random,
						Concurrency: &proxyman.AllocationStrategy_AllocationStrategyConcurrency{
							Value: 2,
						},
						Refresh: &proxyman.AllocationStrategy_AllocationStrategyRefresh{
							Value: 5,
						},
					},
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{}),
				Tag:           "detour",
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id: userID.String(),
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	for i := 0; i < 10; i++ {
		conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
			IP:   []byte{127, 0, 0, 1},
			Port: int(clientPort),
		})
		assert(err, IsNil)

		payload := "dokodemo request."
		nBytes, err := conn.Write([]byte(payload))
		assert(err, IsNil)
		assert(nBytes, Equals, len(payload))

		response := make([]byte, 1024)
		nBytes, err = conn.Read(response)
		assert(err, IsNil)
		assert(response[:nBytes], Equals, xor([]byte(payload)))
		assert(conn.Close(), IsNil)
	}

	CloseAllServers(servers)
}

func TestVMessGCM(t *testing.T) {
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	/*
		const envName = "V2RAY_VMESS_PADDING"
		common.Must(os.Setenv(envName, "1"))
		defer os.Unsetenv(envName)
	*/

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)
	defer CloseAllServers(servers)

	var wg sync.WaitGroup
	wg.Add(10)
	for i := 0; i < 10; i++ {
		go func() {
			conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
				IP:   []byte{127, 0, 0, 1},
				Port: int(clientPort),
			})
			assert(err, IsNil)
			defer conn.Close() // nolint: errcheck

			payload := make([]byte, 10240*1024)
			rand.Read(payload)

			nBytes, err := conn.Write([]byte(payload))
			assert(err, IsNil)
			assert(nBytes, Equals, len(payload))

			response := readFrom(conn, time.Second*40, 10240*1024)
			if err := compare.BytesEqualWithDetail(response, xor([]byte(payload))); err != nil {
				t.Error(err)
			}
			wg.Done()
		}()
	}
	wg.Wait()
}

func TestVMessGCMUDP(t *testing.T) {
	assert := With(t)

	udpServer := udp.Server{
		MsgProcessor: xor,
	}
	dest, err := udpServer.Start()
	assert(err, IsNil)
	defer udpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_UDP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	var wg sync.WaitGroup
	wg.Add(10)
	for i := 0; i < 10; i++ {
		go func() {
			conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
				IP:   []byte{127, 0, 0, 1},
				Port: int(clientPort),
			})
			assert(err, IsNil)

			payload := make([]byte, 1024)
			rand.Read(payload)

			nBytes, err := conn.Write([]byte(payload))
			assert(err, IsNil)
			assert(nBytes, Equals, len(payload))

			payload1 := make([]byte, 1024)
			rand.Read(payload1)
			nBytes, err = conn.Write([]byte(payload1))
			assert(err, IsNil)
			assert(nBytes, Equals, len(payload1))

			response := readFrom(conn, time.Second*5, 1024)
			assert(response, Equals, xor([]byte(payload)))

			response = readFrom(conn, time.Second*5, 1024)
			assert(response, Equals, xor([]byte(payload1)))

			assert(conn.Close(), IsNil)
			wg.Done()
		}()
	}
	wg.Wait()

	CloseAllServers(servers)
}

func TestVMessChacha20(t *testing.T) {
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_CHACHA20_POLY1305,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	var wg sync.WaitGroup
	wg.Add(10)
	for i := 0; i < 10; i++ {
		go func() {
			conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
				IP:   []byte{127, 0, 0, 1},
				Port: int(clientPort),
			})
			assert(err, IsNil)

			payload := make([]byte, 10240*1024)
			rand.Read(payload)

			nBytes, err := conn.Write([]byte(payload))
			assert(err, IsNil)
			assert(nBytes, Equals, len(payload))

			response := readFrom(conn, time.Second*20, 10240*1024)
			assert(response, Equals, xor([]byte(payload)))
			assert(conn.Close(), IsNil)
			wg.Done()
		}()
	}
	wg.Wait()

	CloseAllServers(servers)
}

func TestVMessNone(t *testing.T) {
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_NONE,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	var wg sync.WaitGroup
	wg.Add(10)
	for i := 0; i < 10; i++ {
		go func() {
			defer wg.Done()

			conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
				IP:   []byte{127, 0, 0, 1},
				Port: int(clientPort),
			})
			assert(err, IsNil)

			payload := make([]byte, 1024*1024)
			rand.Read(payload)

			nBytes, err := conn.Write(payload)
			assert(err, IsNil)
			assert(nBytes, Equals, len(payload))

			response := readFrom(conn, time.Second*30, 1024*1024)

			assert(response, Equals, xor(payload))
			assert(conn.Close(), IsNil)
		}()
	}
	wg.Wait()

	CloseAllServers(servers)
}

func TestVMessKCP(t *testing.T) {
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := udp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
					StreamSettings: &internet.StreamConfig{
						Protocol: internet.TransportProtocol_MKCP,
					},
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
				SenderSettings: serial.ToTypedMessage(&proxyman.SenderConfig{
					StreamSettings: &internet.StreamConfig{
						Protocol: internet.TransportProtocol_MKCP,
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	var wg sync.WaitGroup
	for i := 0; i < 10; i++ {
		wg.Add(1)
		go func() {
			conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
				IP:   []byte{127, 0, 0, 1},
				Port: int(clientPort),
			})
			assert(err, IsNil)

			payload := make([]byte, 10240*1024)
			rand.Read(payload)

			nBytes, err := conn.Write(payload)
			assert(err, IsNil)
			assert(nBytes, Equals, len(payload))

			response := readFrom(conn, time.Minute*2, 10240*1024)
			assert(response, Equals, xor(payload))
			assert(conn.Close(), IsNil)
			wg.Done()
		}()
	}
	wg.Wait()

	CloseAllServers(servers)
}

func TestVMessKCPLarge(t *testing.T) {
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := udp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
					StreamSettings: &internet.StreamConfig{
						Protocol: internet.TransportProtocol_MKCP,
						TransportSettings: []*internet.TransportConfig{
							{
								Protocol: internet.TransportProtocol_MKCP,
								Settings: serial.ToTypedMessage(&kcp.Config{
									ReadBuffer: &kcp.ReadBuffer{
										Size: 4096,
									},
									WriteBuffer: &kcp.WriteBuffer{
										Size: 4096,
									},
									UplinkCapacity: &kcp.UplinkCapacity{
										Value: 20,
									},
									DownlinkCapacity: &kcp.DownlinkCapacity{
										Value: 20,
									},
								}),
							},
						},
					},
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
				SenderSettings: serial.ToTypedMessage(&proxyman.SenderConfig{
					StreamSettings: &internet.StreamConfig{
						Protocol: internet.TransportProtocol_MKCP,
						TransportSettings: []*internet.TransportConfig{
							{
								Protocol: internet.TransportProtocol_MKCP,
								Settings: serial.ToTypedMessage(&kcp.Config{
									ReadBuffer: &kcp.ReadBuffer{
										Size: 4096,
									},
									WriteBuffer: &kcp.WriteBuffer{
										Size: 4096,
									},
									UplinkCapacity: &kcp.UplinkCapacity{
										Value: 20,
									},
									DownlinkCapacity: &kcp.DownlinkCapacity{
										Value: 20,
									},
								}),
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	var wg sync.WaitGroup
	for i := 0; i < 2; i++ {
		wg.Add(1)
		go func() {
			conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
				IP:   []byte{127, 0, 0, 1},
				Port: int(clientPort),
			})
			assert(err, IsNil)

			payload := make([]byte, 10240*1024)
			rand.Read(payload)

			nBytes, err := conn.Write(payload)
			assert(err, IsNil)
			assert(nBytes, Equals, len(payload))

			response := readFrom(conn, time.Minute*10, 10240*1024)
			assert(response, Equals, xor(payload))
			assert(conn.Close(), IsNil)
			wg.Done()
		}()
	}
	wg.Wait()

	CloseAllServers(servers)
}

func TestVMessIPv6(t *testing.T) {
	t.SkipNow() // No IPv6 on travis-ci.
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
		Listen:       net.LocalHostIPv6,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIPv6),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIPv6),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIPv6),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
		IP:   net.LocalHostIPv6.IP(),
		Port: int(clientPort),
	})
	assert(err, IsNil)

	payload := make([]byte, 1024)
	rand.Read(payload)

	nBytes, err := conn.Write(payload)
	assert(err, IsNil)
	assert(nBytes, Equals, len(payload))

	response := readFrom(conn, time.Second*20, 1024)
	assert(response, Equals, xor(payload))
	assert(conn.Close(), IsNil)

	CloseAllServers(servers)
}

func TestVMessGCMMux(t *testing.T) {
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				SenderSettings: serial.ToTypedMessage(&proxyman.SenderConfig{
					MultiplexSettings: &proxyman.MultiplexingConfig{
						Enabled:     true,
						Concurrency: 4,
					},
				}),
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	for range "abcd" {
		var wg sync.WaitGroup
		const nConnection = 16
		wg.Add(nConnection)
		for i := 0; i < nConnection; i++ {
			go func() {
				conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
					IP:   []byte{127, 0, 0, 1},
					Port: int(clientPort),
				})
				assert(err, IsNil)

				payload := make([]byte, 10240)
				rand.Read(payload)

				xorpayload := xor(payload)

				nBytes, err := conn.Write(payload)
				assert(err, IsNil)
				assert(nBytes, Equals, len(payload))

				response := readFrom(conn, time.Second*20, 10240)
				assert(response, Equals, xorpayload)
				assert(conn.Close(), IsNil)
				wg.Done()
			}()
		}
		wg.Wait()
		time.Sleep(time.Second)
	}

	CloseAllServers(servers)
}

func TestVMessGCMMuxUDP(t *testing.T) {
	assert := With(t)

	tcpServer := tcp.Server{
		MsgProcessor: xor,
	}
	dest, err := tcpServer.Start()
	assert(err, IsNil)
	defer tcpServer.Close()

	udpServer := udp.Server{
		MsgProcessor: xor,
	}
	udpDest, err := udpServer.Start()
	assert(err, IsNil)
	defer udpServer.Close()

	userID := protocol.NewID(uuid.New())
	serverPort := tcp.PickPort()
	serverConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(serverPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&inbound.Config{
					User: []*protocol.User{
						{
							Account: serial.ToTypedMessage(&vmess.Account{
								Id:      userID.String(),
								AlterId: 64,
							}),
						},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
			},
		},
	}

	clientPort := tcp.PickPort()
	clientUDPPort := udp.PickPort()
	clientConfig := &core.Config{
		App: []*serial.TypedMessage{
			serial.ToTypedMessage(&log.Config{
				ErrorLogLevel: clog.Severity_Debug,
				ErrorLogType:  log.LogType_Console,
			}),
		},
		Inbound: []*core.InboundHandlerConfig{
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(dest.Address),
					Port:    uint32(dest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_TCP},
					},
				}),
			},
			{
				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
					PortRange: net.SinglePortRange(clientUDPPort),
					Listen:    net.NewIPOrDomain(net.LocalHostIP),
				}),
				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
					Address: net.NewIPOrDomain(udpDest.Address),
					Port:    uint32(udpDest.Port),
					NetworkList: &net.NetworkList{
						Network: []net.Network{net.Network_UDP},
					},
				}),
			},
		},
		Outbound: []*core.OutboundHandlerConfig{
			{
				SenderSettings: serial.ToTypedMessage(&proxyman.SenderConfig{
					MultiplexSettings: &proxyman.MultiplexingConfig{
						Enabled:     true,
						Concurrency: 4,
					},
				}),
				ProxySettings: serial.ToTypedMessage(&outbound.Config{
					Receiver: []*protocol.ServerEndpoint{
						{
							Address: net.NewIPOrDomain(net.LocalHostIP),
							Port:    uint32(serverPort),
							User: []*protocol.User{
								{
									Account: serial.ToTypedMessage(&vmess.Account{
										Id:      userID.String(),
										AlterId: 64,
										SecuritySettings: &protocol.SecurityConfig{
											Type: protocol.SecurityType_AES128_GCM,
										},
									}),
								},
							},
						},
					},
				}),
			},
		},
	}

	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
	assert(err, IsNil)

	for range "abcd" {
		var wg sync.WaitGroup
		const nConnection = 16
		wg.Add(nConnection * 2)
		for i := 0; i < nConnection; i++ {
			go func() {
				conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
					IP:   []byte{127, 0, 0, 1},
					Port: int(clientPort),
				})
				assert(err, IsNil)

				payload := make([]byte, 10240)
				rand.Read(payload)

				xorpayload := xor(payload)

				nBytes, err := conn.Write(payload)
				assert(err, IsNil)
				assert(nBytes, Equals, len(payload))

				response := readFrom(conn, time.Second*20, 10240)
				assert(response, Equals, xorpayload)
				assert(conn.Close(), IsNil)
				wg.Done()
			}()
		}
		for i := 0; i < nConnection; i++ {
			go func() {
				conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
					IP:   []byte{127, 0, 0, 1},
					Port: int(clientUDPPort),
				})
				assert(err, IsNil)

				conn.SetDeadline(time.Now().Add(time.Second * 10))

				payload := make([]byte, 1024)
				rand.Read(payload)

				xorpayload := xor(payload)

				for j := 0; j < 2; j++ {
					nBytes, _, err := conn.WriteMsgUDP(payload, nil, nil)
					assert(err, IsNil)
					assert(nBytes, Equals, len(payload))
				}

				response := make([]byte, 1024)
				oob := make([]byte, 16)
				for j := 0; j < 2; j++ {
					nBytes, _, _, _, err := conn.ReadMsgUDP(response, oob)
					assert(err, IsNil)
					assert(nBytes, Equals, 1024)
					assert(response, Equals, xorpayload)
				}

				assert(conn.Close(), IsNil)
				wg.Done()
			}()
		}
		wg.Wait()
		time.Sleep(time.Second)
	}

	CloseAllServers(servers)
}