|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "errors" |
| 6 | + "net" |
| 7 | + "net/netip" |
| 8 | + "testing" |
| 9 | + "time" |
| 10 | + |
| 11 | + C "github.com/sagernet/sing-box/constant" |
| 12 | + "github.com/sagernet/sing-box/option" |
| 13 | + "github.com/sagernet/sing-box/protocol/group" |
| 14 | + "github.com/sagernet/sing/common" |
| 15 | + "github.com/sagernet/sing/common/json/badoption" |
| 16 | + M "github.com/sagernet/sing/common/metadata" |
| 17 | + N "github.com/sagernet/sing/common/network" |
| 18 | + "github.com/sagernet/sing/protocol/socks" |
| 19 | + |
| 20 | + "github.com/stretchr/testify/require" |
| 21 | +) |
| 22 | + |
| 23 | +func startSelectorInstance(t *testing.T, interruptExistConnections bool) *group.Selector { |
| 24 | + instance := startInstance(t, option.Options{ |
| 25 | + Inbounds: []option.Inbound{ |
| 26 | + { |
| 27 | + Type: C.TypeSOCKS, |
| 28 | + Tag: "socks-in", |
| 29 | + Options: &option.SocksInboundOptions{ |
| 30 | + ListenOptions: option.ListenOptions{ |
| 31 | + Listen: common.Ptr(badoption.Addr(netip.IPv4Unspecified())), |
| 32 | + ListenPort: clientPort, |
| 33 | + }, |
| 34 | + }, |
| 35 | + }, |
| 36 | + }, |
| 37 | + Outbounds: []option.Outbound{ |
| 38 | + { |
| 39 | + Type: C.TypeSelector, |
| 40 | + Tag: "sel", |
| 41 | + Options: &option.SelectorOutboundOptions{ |
| 42 | + Outbounds: []string{"memA", "memB"}, |
| 43 | + Default: "memA", |
| 44 | + InterruptExistConnections: interruptExistConnections, |
| 45 | + }, |
| 46 | + }, |
| 47 | + { |
| 48 | + Type: C.TypeDirect, |
| 49 | + Tag: "memA", |
| 50 | + }, |
| 51 | + { |
| 52 | + Type: C.TypeDirect, |
| 53 | + Tag: "memB", |
| 54 | + }, |
| 55 | + }, |
| 56 | + Route: &option.RouteOptions{ |
| 57 | + Final: "sel", |
| 58 | + }, |
| 59 | + }) |
| 60 | + outbound, loaded := instance.Outbound().Outbound("sel") |
| 61 | + require.True(t, loaded) |
| 62 | + selector, isSelector := outbound.(*group.Selector) |
| 63 | + require.True(t, isSelector) |
| 64 | + return selector |
| 65 | +} |
| 66 | + |
| 67 | +func startTCPEchoServer(t *testing.T, port uint16) { |
| 68 | + listener, err := net.ListenTCP("tcp", &net.TCPAddr{IP: localIP.AsSlice(), Port: int(port)}) |
| 69 | + require.NoError(t, err) |
| 70 | + t.Cleanup(func() { |
| 71 | + listener.Close() |
| 72 | + }) |
| 73 | + go func() { |
| 74 | + for { |
| 75 | + conn, err := listener.Accept() |
| 76 | + if err != nil { |
| 77 | + return |
| 78 | + } |
| 79 | + go func() { |
| 80 | + buffer := make([]byte, 1024) |
| 81 | + for { |
| 82 | + n, err := conn.Read(buffer) |
| 83 | + if err != nil { |
| 84 | + conn.Close() |
| 85 | + return |
| 86 | + } |
| 87 | + _, err = conn.Write(buffer[:n]) |
| 88 | + if err != nil { |
| 89 | + conn.Close() |
| 90 | + return |
| 91 | + } |
| 92 | + } |
| 93 | + }() |
| 94 | + } |
| 95 | + }() |
| 96 | +} |
| 97 | + |
| 98 | +func startUDPEchoServer(t *testing.T, port uint16) chan net.Addr { |
| 99 | + packetConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: localIP.AsSlice(), Port: int(port)}) |
| 100 | + require.NoError(t, err) |
| 101 | + t.Cleanup(func() { |
| 102 | + packetConn.Close() |
| 103 | + }) |
| 104 | + sourceCh := make(chan net.Addr, 16) |
| 105 | + go func() { |
| 106 | + buffer := make([]byte, 1024) |
| 107 | + for { |
| 108 | + n, addr, err := packetConn.ReadFrom(buffer) |
| 109 | + if err != nil { |
| 110 | + close(sourceCh) |
| 111 | + return |
| 112 | + } |
| 113 | + sourceCh <- addr |
| 114 | + _, err = packetConn.WriteTo(buffer[:n], addr) |
| 115 | + if err != nil { |
| 116 | + return |
| 117 | + } |
| 118 | + } |
| 119 | + }() |
| 120 | + return sourceCh |
| 121 | +} |
| 122 | + |
| 123 | +func tcpPingPong(t *testing.T, conn net.Conn) { |
| 124 | + _, err := conn.Write([]byte("ping")) |
| 125 | + require.NoError(t, err) |
| 126 | + buffer := make([]byte, 4) |
| 127 | + require.NoError(t, conn.SetReadDeadline(time.Now().Add(5*time.Second))) |
| 128 | + _, err = conn.Read(buffer) |
| 129 | + require.NoError(t, err) |
| 130 | + require.Equal(t, []byte("ping"), buffer) |
| 131 | + require.NoError(t, conn.SetReadDeadline(time.Time{})) |
| 132 | +} |
| 133 | + |
| 134 | +func TestSelectorInterruptRoutedConnection(t *testing.T) { |
| 135 | + selector := startSelectorInstance(t, true) |
| 136 | + startTCPEchoServer(t, testPort) |
| 137 | + |
| 138 | + dialer := socks.NewClient(N.SystemDialer, M.ParseSocksaddrHostPort("127.0.0.1", clientPort), socks.Version5, "", "") |
| 139 | + conn, err := dialer.DialContext(context.Background(), "tcp", M.ParseSocksaddrHostPort("127.0.0.1", testPort)) |
| 140 | + require.NoError(t, err) |
| 141 | + defer conn.Close() |
| 142 | + tcpPingPong(t, conn) |
| 143 | + |
| 144 | + require.True(t, selector.SelectOutbound("memB")) |
| 145 | + |
| 146 | + require.NoError(t, conn.SetReadDeadline(time.Now().Add(3*time.Second))) |
| 147 | + _, err = conn.Read(make([]byte, 4)) |
| 148 | + require.Error(t, err, "existing connection routed through selector must be interrupted") |
| 149 | + var netErr net.Error |
| 150 | + if errors.As(err, &netErr) { |
| 151 | + require.False(t, netErr.Timeout(), "existing connection routed through selector must be interrupted") |
| 152 | + } |
| 153 | +} |
| 154 | + |
| 155 | +func TestSelectorInterruptRoutedPacketConnection(t *testing.T) { |
| 156 | + selector := startSelectorInstance(t, true) |
| 157 | + sourceCh := startUDPEchoServer(t, testPort) |
| 158 | + |
| 159 | + dialer := socks.NewClient(N.SystemDialer, M.ParseSocksaddrHostPort("127.0.0.1", clientPort), socks.Version5, "", "") |
| 160 | + packetConn, err := dialer.ListenPacket(context.Background(), M.ParseSocksaddrHostPort("127.0.0.1", testPort)) |
| 161 | + require.NoError(t, err) |
| 162 | + defer packetConn.Close() |
| 163 | + |
| 164 | + serverAddr := &net.UDPAddr{IP: localIP.AsSlice(), Port: int(testPort)} |
| 165 | + buffer := make([]byte, 1024) |
| 166 | + |
| 167 | + _, err = packetConn.WriteTo([]byte("ping"), serverAddr) |
| 168 | + require.NoError(t, err) |
| 169 | + require.NoError(t, packetConn.SetReadDeadline(time.Now().Add(5*time.Second))) |
| 170 | + _, _, err = packetConn.ReadFrom(buffer) |
| 171 | + require.NoError(t, err) |
| 172 | + firstSource := <-sourceCh |
| 173 | + |
| 174 | + require.True(t, selector.SelectOutbound("memB")) |
| 175 | + // The interrupted NAT session cannot signal the SOCKS client; instead verify |
| 176 | + // that a subsequent packet no longer flows over the old outbound socket. |
| 177 | + _, err = packetConn.WriteTo([]byte("ping"), serverAddr) |
| 178 | + require.NoError(t, err) |
| 179 | + require.NoError(t, packetConn.SetReadDeadline(time.Now().Add(3*time.Second))) |
| 180 | + _, _, err = packetConn.ReadFrom(buffer) |
| 181 | + if err == nil { |
| 182 | + secondSource := <-sourceCh |
| 183 | + require.NotEqual(t, firstSource.String(), secondSource.String(), |
| 184 | + "packet connection routed through selector must be interrupted") |
| 185 | + } |
| 186 | +} |
| 187 | + |
| 188 | +func TestSelectorKeepRoutedConnection(t *testing.T) { |
| 189 | + selector := startSelectorInstance(t, false) |
| 190 | + startTCPEchoServer(t, testPort) |
| 191 | + |
| 192 | + dialer := socks.NewClient(N.SystemDialer, M.ParseSocksaddrHostPort("127.0.0.1", clientPort), socks.Version5, "", "") |
| 193 | + conn, err := dialer.DialContext(context.Background(), "tcp", M.ParseSocksaddrHostPort("127.0.0.1", testPort)) |
| 194 | + require.NoError(t, err) |
| 195 | + defer conn.Close() |
| 196 | + tcpPingPong(t, conn) |
| 197 | + |
| 198 | + require.True(t, selector.SelectOutbound("memB")) |
| 199 | + |
| 200 | + tcpPingPong(t, conn) |
| 201 | +} |
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