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add OutlineDevice to handle proxy traffic
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| // Copyright 2023 Jigsaw Operations LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "strconv" | ||
| "sync" | ||
|
|
||
| "github.com/Jigsaw-Code/outline-internal-sdk/network" | ||
| "github.com/Jigsaw-Code/outline-internal-sdk/network/dnstruncate" | ||
| "github.com/Jigsaw-Code/outline-internal-sdk/network/lwip2transport" | ||
| "github.com/Jigsaw-Code/outline-internal-sdk/transport" | ||
| "github.com/Jigsaw-Code/outline-internal-sdk/transport/shadowsocks" | ||
| "github.com/Jigsaw-Code/outline-internal-sdk/x/connectivity" | ||
| ) | ||
|
|
||
| const ( | ||
| connectivityTestDomain = "www.google.com" | ||
| connectivityTestResolver = "1.1.1.1:53" | ||
| ) | ||
|
|
||
| type OutlineConfig struct { | ||
| Hostname string | ||
| Port uint16 | ||
| Password string | ||
| Cipher string | ||
| } | ||
|
|
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| type OutlineDevice struct { | ||
| t2s network.IPDevice | ||
| pktProxy network.DelegatePacketProxy | ||
| fallbackPktProxy network.PacketProxy | ||
| ssStreamDialer transport.StreamDialer | ||
| ssPktListener transport.PacketListener | ||
| ssPktProxy network.PacketProxy | ||
| } | ||
|
|
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| func NewOutlineDevice(config *OutlineConfig) (od *OutlineDevice, err error) { | ||
| od = &OutlineDevice{} | ||
|
|
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| cipher, err := shadowsocks.NewEncryptionKey(config.Cipher, config.Password) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create cipher `%v`: %w", config.Cipher, err) | ||
| } | ||
|
|
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| ssAddress := net.JoinHostPort(config.Hostname, strconv.Itoa(int(config.Port))) | ||
|
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| // Create Shadowsocks TCP StreamDialer | ||
| od.ssStreamDialer, err = shadowsocks.NewStreamDialer(&transport.TCPEndpoint{Address: ssAddress}, cipher) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create TCP dialer: %w", err) | ||
| } | ||
|
|
||
| // Create DNS Truncated PacketProxy | ||
| od.fallbackPktProxy, err = dnstruncate.NewPacketProxy() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create DNS truncate proxy: %w", err) | ||
| } | ||
|
|
||
| // Create Shadowsocks UDP PacketProxy | ||
| od.ssPktListener, err = shadowsocks.NewPacketListener(&transport.UDPEndpoint{Address: ssAddress}, cipher) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create UDP listener: %w", err) | ||
| } | ||
|
|
||
| od.ssPktProxy, err = network.NewPacketProxyFromPacketListener(od.ssPktListener) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create UDP proxy: %w", err) | ||
| } | ||
|
|
||
| // Create DelegatePacketProxy | ||
| od.pktProxy, err = network.NewDelegatePacketProxy(od.fallbackPktProxy) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create delegate UDP proxy: %w", err) | ||
| } | ||
|
|
||
| // Configure lwIP Device | ||
| od.t2s, err = lwip2transport.ConfigureDevice(od.ssStreamDialer, od.pktProxy) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to configure lwIP: %w", err) | ||
| } | ||
|
|
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| return | ||
| } | ||
|
|
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| func (d *OutlineDevice) Close() error { | ||
| return d.t2s.Close() | ||
| } | ||
|
|
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| func (d *OutlineDevice) Refresh() error { | ||
| fmt.Println("debug: testing TCP connectivity...") | ||
| streamResolver := &transport.StreamDialerEndpoint{Dialer: d.ssStreamDialer, Address: connectivityTestResolver} | ||
| _, err := connectivity.TestResolverStreamConnectivity(context.Background(), streamResolver, connectivityTestDomain) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to connect to the remote Shadowsocks server: %w", err) | ||
| } | ||
|
|
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| fmt.Println("debug: testing UDP connectivity...") | ||
| dialer := transport.PacketListenerDialer{Listener: d.ssPktListener} | ||
| packetResolver := &transport.PacketDialerEndpoint{Dialer: dialer, Address: connectivityTestResolver} | ||
| _, err = connectivity.TestResolverPacketConnectivity(context.Background(), packetResolver, connectivityTestDomain) | ||
| fmt.Printf("debug: UDP connectivity test result: %v\n", err) | ||
|
|
||
| if err != nil { | ||
| fmt.Println("info: remote Shadowsocks server doesn't support UDP, switching to local DNS truncation handler") | ||
| return d.pktProxy.SetProxy(d.fallbackPktProxy) | ||
| } else { | ||
| fmt.Println("info: remote Shadowsocks server supports UDP traffic") | ||
| return d.pktProxy.SetProxy(d.ssPktProxy) | ||
| } | ||
| } | ||
|
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| func (d *OutlineDevice) RelayTraffic(netDev io.ReadWriter) error { | ||
| var err1, err2 error | ||
|
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| wg := &sync.WaitGroup{} | ||
| wg.Add(1) | ||
|
|
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| go func() { | ||
| defer wg.Done() | ||
|
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| fmt.Println("debug: OutlineDevice start receiving data from tun") | ||
| if _, err2 = io.Copy(d.t2s, netDev); err2 != nil { | ||
| fmt.Printf("warning: failed to write data to OutlineDevice: %v\n", err2) | ||
| } else { | ||
| fmt.Println("debug: tun -> OutlineDevice eof") | ||
| } | ||
| }() | ||
|
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| fmt.Println("debug: start forwarding OutlineDevice data to tun") | ||
| if _, err1 = io.Copy(netDev, d.t2s); err1 != nil { | ||
| fmt.Printf("warning: failed to forward OutlineDevice data to tun: %v\n", err1) | ||
| } else { | ||
| fmt.Println("debug: OutlineDevice -> tun eof") | ||
| } | ||
|
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| wg.Wait() | ||
|
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| return errors.Join(err1, err2) | ||
| } |