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shadowsocks.go
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shadowsocks.go
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// R.I.P Shadowsocks
package shadowsocks
import (
"crypto/rand"
"io"
"sync"
"github.com/v2ray/v2ray-core/app"
"github.com/v2ray/v2ray-core/app/dispatcher"
"github.com/v2ray/v2ray-core/common/alloc"
v2io "github.com/v2ray/v2ray-core/common/io"
"github.com/v2ray/v2ray-core/common/log"
v2net "github.com/v2ray/v2ray-core/common/net"
"github.com/v2ray/v2ray-core/common/serial"
"github.com/v2ray/v2ray-core/proxy"
"github.com/v2ray/v2ray-core/proxy/internal"
"github.com/v2ray/v2ray-core/transport/hub"
)
type Shadowsocks struct {
packetDispatcher dispatcher.PacketDispatcher
config *Config
port v2net.Port
accepting bool
tcpHub *hub.TCPHub
udpHub *hub.UDPHub
}
func NewShadowsocks(config *Config, packetDispatcher dispatcher.PacketDispatcher) *Shadowsocks {
return &Shadowsocks{
config: config,
packetDispatcher: packetDispatcher,
}
}
func (this *Shadowsocks) Port() v2net.Port {
return this.port
}
func (this *Shadowsocks) Close() {
this.accepting = false
// TODO: synchronization
if this.tcpHub != nil {
this.tcpHub.Close()
this.tcpHub = nil
}
if this.udpHub != nil {
this.udpHub.Close()
this.udpHub = nil
}
}
func (this *Shadowsocks) Listen(port v2net.Port) error {
if this.accepting {
if this.port == port {
return nil
} else {
return proxy.ErrorAlreadyListening
}
}
this.accepting = true
tcpHub, err := hub.ListenTCP(port, this.handleConnection)
if err != nil {
log.Error("Shadowsocks: Failed to listen TCP on port ", port, ": ", err)
return err
}
this.tcpHub = tcpHub
if this.config.UDP {
udpHub, err := hub.ListenUDP(port, this.handlerUDPPayload)
if err != nil {
log.Error("Shadowsocks: Failed to listen UDP on port ", port, ": ", err)
}
this.udpHub = udpHub
}
return nil
}
func (this *Shadowsocks) handlerUDPPayload(payload *alloc.Buffer, source v2net.Destination) {
defer payload.Release()
iv := payload.Value[:this.config.Cipher.IVSize()]
key := this.config.Key
payload.SliceFrom(this.config.Cipher.IVSize())
reader, err := this.config.Cipher.NewDecodingStream(key, iv, payload)
if err != nil {
log.Error("Shadowsocks: Failed to create decoding stream: ", err)
return
}
request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(key, iv)), true)
if err != nil {
log.Access(source, serial.StringLiteral(""), log.AccessRejected, serial.StringLiteral(err.Error()))
log.Warning("Shadowsocks: Invalid request from ", source, ": ", err)
return
}
dest := v2net.UDPDestination(request.Address, request.Port)
log.Access(source, dest, log.AccessAccepted, serial.StringLiteral(""))
log.Info("Shadowsocks: Tunnelling request to ", dest)
packet := v2net.NewPacket(dest, request.UDPPayload, false)
ray := this.packetDispatcher.DispatchToOutbound(packet)
close(ray.InboundInput())
for respChunk := range ray.InboundOutput() {
response := alloc.NewBuffer().Slice(0, this.config.Cipher.IVSize())
rand.Read(response.Value)
respIv := response.Value
writer, err := this.config.Cipher.NewEncodingStream(key, respIv, response)
if err != nil {
log.Error("Shadowsocks: Failed to create encoding stream: ", err)
return
}
switch {
case request.Address.IsIPv4():
writer.Write([]byte{AddrTypeIPv4})
writer.Write(request.Address.IP())
case request.Address.IsIPv6():
writer.Write([]byte{AddrTypeIPv6})
writer.Write(request.Address.IP())
case request.Address.IsDomain():
writer.Write([]byte{AddrTypeDomain, byte(len(request.Address.Domain()))})
writer.Write([]byte(request.Address.Domain()))
}
writer.Write(request.Port.Bytes())
writer.Write(respChunk.Value)
respChunk.Release()
if request.OTA {
respAuth := NewAuthenticator(HeaderKeyGenerator(key, respIv))
respAuth.Authenticate(response.Value, response.Value[this.config.Cipher.IVSize():])
}
this.udpHub.WriteTo(response.Value, source)
response.Release()
}
}
func (this *Shadowsocks) handleConnection(conn *hub.TCPConn) {
defer conn.Close()
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
_, err := io.ReadFull(conn, buffer.Value[:this.config.Cipher.IVSize()])
if err != nil {
log.Access(conn.RemoteAddr(), serial.StringLiteral(""), log.AccessRejected, serial.StringLiteral(err.Error()))
log.Error("Shadowsocks: Failed to read IV: ", err)
return
}
iv := buffer.Value[:this.config.Cipher.IVSize()]
key := this.config.Key
reader, err := this.config.Cipher.NewDecodingStream(key, iv, conn)
if err != nil {
log.Error("Shadowsocks: Failed to create decoding stream: ", err)
return
}
request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(iv, key)), false)
if err != nil {
log.Access(conn.RemoteAddr(), serial.StringLiteral(""), log.AccessRejected, serial.StringLiteral(err.Error()))
log.Warning("Shadowsocks: Invalid request from ", conn.RemoteAddr(), ": ", err)
return
}
dest := v2net.TCPDestination(request.Address, request.Port)
log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, serial.StringLiteral(""))
log.Info("Shadowsocks: Tunnelling request to ", dest)
packet := v2net.NewPacket(dest, nil, true)
ray := this.packetDispatcher.DispatchToOutbound(packet)
var writeFinish sync.Mutex
writeFinish.Lock()
go func() {
if payload, ok := <-ray.InboundOutput(); ok {
payload.SliceBack(16)
rand.Read(payload.Value[:16])
writer, err := this.config.Cipher.NewEncodingStream(key, payload.Value[:16], conn)
if err != nil {
log.Error("Shadowsocks: Failed to create encoding stream: ", err)
return
}
writer.Write(payload.Value)
payload.Release()
v2io.ChanToWriter(writer, ray.InboundOutput())
}
writeFinish.Unlock()
}()
var payloadReader v2io.Reader
if request.OTA {
payloadAuth := NewAuthenticator(ChunkKeyGenerator(iv))
payloadReader = NewChunkReader(reader, payloadAuth)
} else {
payloadReader = v2io.NewAdaptiveReader(reader)
}
v2io.ReaderToChan(ray.InboundInput(), payloadReader)
close(ray.InboundInput())
writeFinish.Lock()
}
func init() {
internal.MustRegisterInboundHandlerCreator("shadowsocks",
func(space app.Space, rawConfig interface{}) (proxy.InboundHandler, error) {
if !space.HasApp(dispatcher.APP_ID) {
return nil, internal.ErrorBadConfiguration
}
return NewShadowsocks(
rawConfig.(*Config),
space.GetApp(dispatcher.APP_ID).(dispatcher.PacketDispatcher)), nil
})
}