func (v *Server) handleSocks4(clientAddr v2net.Destination, reader *bufio.BufferedReader, writer *bufio.BufferedWriter, auth protocol.Socks4AuthenticationRequest) error {
result := protocol.Socks4RequestGranted
if auth.Command == protocol.CmdBind {
result = protocol.Socks4RequestRejected
}
socks4Response := protocol.NewSocks4AuthenticationResponse(result, auth.Port, auth.IP[:])
socks4Response.Write(writer)
if result == protocol.Socks4RequestRejected {
log.Warning("Socks: Unsupported socks 4 command ", auth.Command)
log.Access(clientAddr, "", log.AccessRejected, ErrUnsupportedSocksCommand)
return ErrUnsupportedSocksCommand
}
reader.SetCached(false)
writer.SetCached(false)
dest := v2net.TCPDestination(v2net.IPAddress(auth.IP[:]), auth.Port)
session := &proxy.SessionInfo{
Source: clientAddr,
Destination: dest,
Inbound: v.meta,
}
log.Access(clientAddr, dest, log.AccessAccepted, "")
v.transport(reader, writer, session)
return nil
}
func (v *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection) error {
source := proxy.SourceFromContext(ctx)
reader := buf.NewReader(conn)
for {
payload, err := reader.Read()
if err != nil {
break
}
request, data, err := DecodeUDPPacket(v.user, payload)
if err != nil {
log.Info("Shadowsocks|Server: Skipping invalid UDP packet from: ", source, ": ", err)
log.Access(source, "", log.AccessRejected, err)
payload.Release()
continue
}
if request.Option.Has(RequestOptionOneTimeAuth) && v.account.OneTimeAuth == Account_Disabled {
log.Info("Shadowsocks|Server: Client payload enables OTA but server doesn't allow it.")
payload.Release()
continue
}
if !request.Option.Has(RequestOptionOneTimeAuth) && v.account.OneTimeAuth == Account_Enabled {
log.Info("Shadowsocks|Server: Client payload disables OTA but server forces it.")
payload.Release()
continue
}
dest := request.Destination()
log.Access(source, dest, log.AccessAccepted, "")
log.Info("Shadowsocks|Server: Tunnelling request to ", dest)
ctx = protocol.ContextWithUser(ctx, request.User)
v.udpServer.Dispatch(ctx, dest, data, func(payload *buf.Buffer) {
defer payload.Release()
data, err := EncodeUDPPacket(request, payload)
if err != nil {
log.Warning("Shadowsocks|Server: Failed to encode UDP packet: ", err)
return
}
defer data.Release()
conn.Write(data.Bytes())
})
}
return nil
}
func (s *Server) Process(ctx context.Context, network v2net.Network, conn internet.Connection) error {
conn.SetReusable(false)
timedReader := v2net.NewTimeOutReader(s.config.Timeout, conn)
reader := bufio.OriginalReaderSize(timedReader, 2048)
request, err := http.ReadRequest(reader)
if err != nil {
if errors.Cause(err) != io.EOF {
log.Warning("HTTP: Failed to read http request: ", err)
}
return err
}
log.Info("HTTP: Request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")
defaultPort := v2net.Port(80)
if strings.ToLower(request.URL.Scheme) == "https" {
defaultPort = v2net.Port(443)
}
host := request.Host
if len(host) == 0 {
host = request.URL.Host
}
dest, err := parseHost(host, defaultPort)
if err != nil {
log.Warning("HTTP: Malformed proxy host (", host, "): ", err)
return err
}
log.Access(conn.RemoteAddr(), request.URL, log.AccessAccepted, "")
ctx = proxy.ContextWithDestination(ctx, dest)
if strings.ToUpper(request.Method) == "CONNECT" {
return s.handleConnect(ctx, request, reader, conn)
} else {
return s.handlePlainHTTP(ctx, request, reader, conn)
}
}
func (this *Server) handlerUDPPayload(payload *alloc.Buffer, session *proxy.SessionInfo) {
source := session.Source
request, data, err := DecodeUDPPacket(this.user, payload)
if err != nil {
log.Info("Shadowsocks|Server: Skipping invalid UDP packet from: ", source, ": ", err)
log.Access(source, "", log.AccessRejected, err)
payload.Release()
return
}
if request.Option.Has(RequestOptionOneTimeAuth) && this.account.OneTimeAuth == Account_Disabled {
log.Info("Shadowsocks|Server: Client payload enables OTA but server doesn't allow it.")
payload.Release()
return
}
if !request.Option.Has(RequestOptionOneTimeAuth) && this.account.OneTimeAuth == Account_Enabled {
log.Info("Shadowsocks|Server: Client payload disables OTA but server forces it.")
payload.Release()
return
}
dest := request.Destination()
log.Access(source, dest, log.AccessAccepted, "")
log.Info("Shadowsocks|Server: Tunnelling request to ", dest)
this.udpServer.Dispatch(&proxy.SessionInfo{Source: source, Destination: dest, User: request.User, Inbound: this.meta}, data, func(destination v2net.Destination, payload *alloc.Buffer) {
defer payload.Release()
data, err := EncodeUDPPacket(request, payload)
if err != nil {
log.Warning("Shadowsocks|Server: Failed to encode UDP packet: ", err)
return
}
defer data.Release()
this.udpHub.WriteTo(data.Value, source)
})
}
func (this *Server) handleUDPPayload(payload *alloc.Buffer, session *proxy.SessionInfo) {
source := session.Source
log.Info("Socks: Client UDP connection from ", source)
request, err := protocol.ReadUDPRequest(payload.Value)
payload.Release()
if err != nil {
log.Error("Socks: Failed to parse UDP request: ", err)
return
}
if request.Data.Len() == 0 {
request.Data.Release()
return
}
if request.Fragment != 0 {
log.Warning("Socks: Dropping fragmented UDP packets.")
// TODO handle fragments
request.Data.Release()
return
}
log.Info("Socks: Send packet to ", request.Destination(), " with ", request.Data.Len(), " bytes")
log.Access(source, request.Destination, log.AccessAccepted, "")
this.udpServer.Dispatch(&proxy.SessionInfo{Source: source, Destination: request.Destination()}, request.Data, func(destination v2net.Destination, payload *alloc.Buffer) {
response := &protocol.Socks5UDPRequest{
Fragment: 0,
Address: request.Destination().Address(),
Port: request.Destination().Port(),
Data: payload,
}
log.Info("Socks: Writing back UDP response with ", payload.Len(), " bytes to ", destination)
udpMessage := alloc.NewLocalBuffer(2048).Clear()
response.Write(udpMessage)
this.udpMutex.RLock()
if !this.accepting {
this.udpMutex.RUnlock()
return
}
nBytes, err := this.udpHub.WriteTo(udpMessage.Value, destination)
this.udpMutex.RUnlock()
udpMessage.Release()
response.Data.Release()
if err != nil {
log.Error("Socks: failed to write UDP message (", nBytes, " bytes) to ", destination, ": ", err)
}
})
}
func (s *Server) processTCP(ctx context.Context, conn internet.Connection) error {
conn.SetReusable(false)
timedReader := net.NewTimeOutReader(16 /* seconds, for handshake */, conn)
reader := bufio.NewReader(timedReader)
inboundDest := proxy.InboundDestinationFromContext(ctx)
session := &ServerSession{
config: s.config,
port: inboundDest.Port,
}
source := proxy.SourceFromContext(ctx)
request, err := session.Handshake(reader, conn)
if err != nil {
log.Access(source, "", log.AccessRejected, err)
log.Info("Socks|Server: Failed to read request: ", err)
return err
}
if request.Command == protocol.RequestCommandTCP {
dest := request.Destination()
log.Info("Socks|Server: TCP Connect request to ", dest)
log.Access(source, dest, log.AccessAccepted, "")
timedReader.SetTimeOut(s.config.Timeout)
ctx = proxy.ContextWithDestination(ctx, dest)
return s.transport(ctx, reader, conn)
}
if request.Command == protocol.RequestCommandUDP {
return s.handleUDP()
}
return nil
}
func (this *Server) handleConnection(conn internet.Connection) {
defer conn.Close()
timedReader := v2net.NewTimeOutReader(this.config.Timeout, conn)
reader := bufio.NewReaderSize(timedReader, 2048)
request, err := http.ReadRequest(reader)
if err != nil {
if err != io.EOF {
log.Warning("HTTP: Failed to read http request: ", err)
}
return
}
log.Info("HTTP: Request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")
defaultPort := v2net.Port(80)
if strings.ToLower(request.URL.Scheme) == "https" {
defaultPort = v2net.Port(443)
}
host := request.Host
if len(host) == 0 {
host = request.URL.Host
}
dest, err := parseHost(host, defaultPort)
if err != nil {
log.Warning("HTTP: Malformed proxy host (", host, "): ", err)
return
}
log.Access(conn.RemoteAddr(), request.URL, log.AccessAccepted, "")
session := &proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
Inbound: this.meta,
}
if strings.ToUpper(request.Method) == "CONNECT" {
this.handleConnect(request, session, reader, conn)
} else {
this.handlePlainHTTP(request, session, reader, conn)
}
}
func (v *Server) handleUDPPayload(ctx context.Context, conn internet.Connection) error {
source := proxy.SourceFromContext(ctx)
log.Info("Socks|Server: Client UDP connection from ", source)
reader := buf.NewReader(conn)
for {
payload, err := reader.Read()
if err != nil {
return err
}
request, data, err := DecodeUDPPacket(payload.Bytes())
if err != nil {
log.Info("Socks|Server: Failed to parse UDP request: ", err)
continue
}
if len(data) == 0 {
continue
}
log.Info("Socks: Send packet to ", request.Destination(), " with ", len(data), " bytes")
log.Access(source, request.Destination, log.AccessAccepted, "")
dataBuf := buf.NewSmall()
dataBuf.Append(data)
v.udpServer.Dispatch(ctx, request.Destination(), dataBuf, func(payload *buf.Buffer) {
defer payload.Release()
log.Info("Socks|Server: Writing back UDP response with ", payload.Len(), " bytes")
udpMessage := EncodeUDPPacket(request, payload.Bytes())
defer udpMessage.Release()
conn.Write(udpMessage.Bytes())
})
}
}
func (v *Server) handleSocks5(clientAddr v2net.Destination, reader *bufio.BufferedReader, writer *bufio.BufferedWriter, auth protocol.Socks5AuthenticationRequest) error {
expectedAuthMethod := protocol.AuthNotRequired
if v.config.AuthType == AuthType_PASSWORD {
expectedAuthMethod = protocol.AuthUserPass
}
if !auth.HasAuthMethod(expectedAuthMethod) {
authResponse := protocol.NewAuthenticationResponse(protocol.AuthNoMatchingMethod)
err := protocol.WriteAuthentication(writer, authResponse)
writer.Flush()
if err != nil {
log.Warning("Socks: failed to write authentication: ", err)
return err
}
log.Warning("Socks: client doesn't support any allowed auth methods.")
return ErrUnsupportedAuthMethod
}
authResponse := protocol.NewAuthenticationResponse(expectedAuthMethod)
protocol.WriteAuthentication(writer, authResponse)
err := writer.Flush()
if err != nil {
log.Error("Socks: failed to write authentication: ", err)
return err
}
if v.config.AuthType == AuthType_PASSWORD {
upRequest, err := protocol.ReadUserPassRequest(reader)
if err != nil {
log.Warning("Socks: failed to read username and password: "******"Socks: failed to write user pass response: ", err)
return err
}
if status != byte(0) {
log.Warning("Socks: Invalid user account: ", upRequest.AuthDetail())
log.Access(clientAddr, "", log.AccessRejected, crypto.ErrAuthenticationFailed)
return crypto.ErrAuthenticationFailed
}
}
request, err := protocol.ReadRequest(reader)
if err != nil {
log.Warning("Socks: failed to read request: ", err)
return err
}
if request.Command == protocol.CmdUdpAssociate && v.config.UdpEnabled {
return v.handleUDP(reader, writer)
}
if request.Command == protocol.CmdBind || request.Command == protocol.CmdUdpAssociate {
response := protocol.NewSocks5Response()
response.Error = protocol.ErrorCommandNotSupported
response.Port = v2net.Port(0)
response.SetIPv4([]byte{0, 0, 0, 0})
response.Write(writer)
writer.Flush()
if err != nil {
log.Error("Socks: failed to write response: ", err)
return err
}
log.Warning("Socks: Unsupported socks command ", request.Command)
return ErrUnsupportedSocksCommand
}
response := protocol.NewSocks5Response()
response.Error = protocol.ErrorSuccess
// Some SOCKS software requires a value other than dest. Let's fake one:
response.Port = v2net.Port(1717)
response.SetIPv4([]byte{0, 0, 0, 0})
response.Write(writer)
if err != nil {
log.Error("Socks: failed to write response: ", err)
return err
}
reader.SetCached(false)
writer.SetCached(false)
dest := request.Destination()
session := &proxy.SessionInfo{
Source: clientAddr,
Destination: dest,
Inbound: v.meta,
}
log.Info("Socks: TCP Connect request to ", dest)
log.Access(clientAddr, dest, log.AccessAccepted, "")
v.transport(reader, writer, session)
return nil
}
func (v *VMessInboundHandler) Process(ctx context.Context, network net.Network, connection internet.Connection) error {
connReader := net.NewTimeOutReader(8, connection)
reader := bufio.NewReader(connReader)
session := encoding.NewServerSession(v.clients)
request, err := session.DecodeRequestHeader(reader)
if err != nil {
if errors.Cause(err) != io.EOF {
log.Access(connection.RemoteAddr(), "", log.AccessRejected, err)
log.Info("VMess|Inbound: Invalid request from ", connection.RemoteAddr(), ": ", err)
}
connection.SetReusable(false)
return err
}
log.Access(connection.RemoteAddr(), request.Destination(), log.AccessAccepted, "")
log.Info("VMess|Inbound: Received request for ", request.Destination())
connection.SetReusable(request.Option.Has(protocol.RequestOptionConnectionReuse))
ctx = proxy.ContextWithDestination(ctx, request.Destination())
ctx = protocol.ContextWithUser(ctx, request.User)
ray := v.packetDispatcher.DispatchToOutbound(ctx)
input := ray.InboundInput()
output := ray.InboundOutput()
userSettings := request.User.GetSettings()
connReader.SetTimeOut(userSettings.PayloadReadTimeout)
reader.SetBuffered(false)
requestDone := signal.ExecuteAsync(func() error {
return transferRequest(session, request, reader, input)
})
writer := bufio.NewWriter(connection)
response := &protocol.ResponseHeader{
Command: v.generateCommand(ctx, request),
}
if connection.Reusable() {
response.Option.Set(protocol.ResponseOptionConnectionReuse)
}
responseDone := signal.ExecuteAsync(func() error {
return transferResponse(session, request, response, output, writer)
})
if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
log.Info("VMess|Inbound: Connection ending with ", err)
connection.SetReusable(false)
input.CloseError()
output.CloseError()
return err
}
if err := writer.Flush(); err != nil {
log.Info("VMess|Inbound: Failed to flush remain data: ", err)
connection.SetReusable(false)
return err
}
return nil
}
func (this *Server) handleConnection(conn internet.Connection) {
defer conn.Close()
conn.SetReusable(false)
timedReader := v2net.NewTimeOutReader(16, conn)
defer timedReader.Release()
bufferedReader := v2io.NewBufferedReader(timedReader)
defer bufferedReader.Release()
request, bodyReader, err := ReadTCPSession(this.user, bufferedReader)
if err != nil {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
log.Info("Shadowsocks|Server: Failed to create request from: ", conn.RemoteAddr(), ": ", err)
return
}
defer bodyReader.Release()
bufferedReader.SetCached(false)
userSettings := this.user.GetSettings()
timedReader.SetTimeOut(userSettings.PayloadReadTimeout)
dest := request.Destination()
log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, "")
log.Info("Shadowsocks|Server: Tunnelling request to ", dest)
ray := this.packetDispatcher.DispatchToOutbound(&proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
User: request.User,
Inbound: this.meta,
})
defer ray.InboundOutput().Release()
var writeFinish sync.Mutex
writeFinish.Lock()
go func() {
defer writeFinish.Unlock()
bufferedWriter := v2io.NewBufferedWriter(conn)
defer bufferedWriter.Release()
responseWriter, err := WriteTCPResponse(request, bufferedWriter)
if err != nil {
log.Warning("Shadowsocks|Server: Failed to write response: ", err)
return
}
defer responseWriter.Release()
if payload, err := ray.InboundOutput().Read(); err == nil {
responseWriter.Write(payload)
bufferedWriter.SetCached(false)
v2io.Pipe(ray.InboundOutput(), responseWriter)
}
}()
v2io.Pipe(bodyReader, ray.InboundInput())
ray.InboundInput().Close()
writeFinish.Lock()
}
func (s *Server) handleConnection(ctx context.Context, conn internet.Connection) error {
conn.SetReusable(false)
timedReader := net.NewTimeOutReader(16, conn)
bufferedReader := bufio.NewReader(timedReader)
request, bodyReader, err := ReadTCPSession(s.user, bufferedReader)
if err != nil {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
log.Info("Shadowsocks|Server: Failed to create request from: ", conn.RemoteAddr(), ": ", err)
return err
}
bufferedReader.SetBuffered(false)
userSettings := s.user.GetSettings()
timedReader.SetTimeOut(userSettings.PayloadReadTimeout)
dest := request.Destination()
log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, "")
log.Info("Shadowsocks|Server: Tunnelling request to ", dest)
ctx = proxy.ContextWithDestination(ctx, dest)
ctx = protocol.ContextWithUser(ctx, request.User)
ray := s.packetDispatcher.DispatchToOutbound(ctx)
requestDone := signal.ExecuteAsync(func() error {
bufferedWriter := bufio.NewWriter(conn)
responseWriter, err := WriteTCPResponse(request, bufferedWriter)
if err != nil {
log.Warning("Shadowsocks|Server: Failed to write response: ", err)
return err
}
payload, err := ray.InboundOutput().Read()
if err != nil {
return err
}
if err := responseWriter.Write(payload); err != nil {
return err
}
payload.Release()
if err := bufferedWriter.SetBuffered(false); err != nil {
return err
}
if err := buf.PipeUntilEOF(ray.InboundOutput(), responseWriter); err != nil {
log.Info("Shadowsocks|Server: Failed to transport all TCP response: ", err)
return err
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer ray.InboundInput().Close()
if err := buf.PipeUntilEOF(bodyReader, ray.InboundInput()); err != nil {
log.Info("Shadowsocks|Server: Failed to transport all TCP request: ", err)
return err
}
return nil
})
if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
log.Info("Shadowsocks|Server: Connection ends with ", err)
ray.InboundInput().CloseError()
ray.InboundOutput().CloseError()
return err
}
return nil
}
func (this *VMessInboundHandler) HandleConnection(connection internet.Connection) {
defer connection.Close()
if !this.accepting {
return
}
connReader := v2net.NewTimeOutReader(8, connection)
defer connReader.Release()
reader := v2io.NewBufferedReader(connReader)
defer reader.Release()
this.RLock()
if !this.accepting {
this.RUnlock()
return
}
session := encoding.NewServerSession(this.clients)
defer session.Release()
request, err := session.DecodeRequestHeader(reader)
this.RUnlock()
if err != nil {
if err != io.EOF {
log.Access(connection.RemoteAddr(), "", log.AccessRejected, err)
log.Warning("VMessIn: Invalid request from ", connection.RemoteAddr(), ": ", err)
}
connection.SetReusable(false)
return
}
log.Access(connection.RemoteAddr(), request.Destination(), log.AccessAccepted, "")
log.Info("VMessIn: Received request for ", request.Destination())
connection.SetReusable(request.Option.Has(protocol.RequestOptionConnectionReuse))
ray := this.packetDispatcher.DispatchToOutbound(this.meta, &proxy.SessionInfo{
Source: v2net.DestinationFromAddr(connection.RemoteAddr()),
Destination: request.Destination(),
})
input := ray.InboundInput()
output := ray.InboundOutput()
defer input.Close()
defer output.Release()
var readFinish sync.Mutex
readFinish.Lock()
userSettings := protocol.GetUserSettings(request.User.Level)
connReader.SetTimeOut(userSettings.PayloadReadTimeout)
reader.SetCached(false)
go func() {
bodyReader := session.DecodeRequestBody(reader)
var requestReader v2io.Reader
if request.Option.Has(protocol.RequestOptionChunkStream) {
requestReader = vmessio.NewAuthChunkReader(bodyReader)
} else {
requestReader = v2io.NewAdaptiveReader(bodyReader)
}
err := v2io.Pipe(requestReader, input)
if err != io.EOF {
connection.SetReusable(false)
}
requestReader.Release()
input.Close()
readFinish.Unlock()
}()
writer := v2io.NewBufferedWriter(connection)
defer writer.Release()
response := &protocol.ResponseHeader{
Command: this.generateCommand(request),
}
if connection.Reusable() {
response.Option.Set(protocol.ResponseOptionConnectionReuse)
}
session.EncodeResponseHeader(response, writer)
bodyWriter := session.EncodeResponseBody(writer)
var v2writer v2io.Writer = v2io.NewAdaptiveWriter(bodyWriter)
if request.Option.Has(protocol.RequestOptionChunkStream) {
v2writer = vmessio.NewAuthChunkWriter(v2writer)
}
// Optimize for small response packet
if data, err := output.Read(); err == nil {
if err := v2writer.Write(data); err != nil {
connection.SetReusable(false)
}
writer.SetCached(false)
err = v2io.Pipe(output, v2writer)
if err != io.EOF {
connection.SetReusable(false)
}
}
output.Release()
if request.Option.Has(protocol.RequestOptionChunkStream) {
if err := v2writer.Write(alloc.NewLocalBuffer(32).Clear()); err != nil {
connection.SetReusable(false)
}
}
writer.Flush()
v2writer.Release()
readFinish.Lock()
}
func (this *Server) handlerUDPPayload(payload *alloc.Buffer, session *proxy.SessionInfo) {
defer payload.Release()
source := session.Source
ivLen := this.config.Cipher.IVSize()
iv := payload.Value[:ivLen]
key := this.config.Key
payload.SliceFrom(ivLen)
stream, err := this.config.Cipher.NewDecodingStream(key, iv)
if err != nil {
log.Error("Shadowsocks: Failed to create decoding stream: ", err)
return
}
reader := crypto.NewCryptionReader(stream, payload)
request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(key, iv)), true)
if err != nil {
if err != io.EOF {
log.Access(source, "", log.AccessRejected, err)
log.Warning("Shadowsocks: Invalid request from ", source, ": ", err)
}
return
}
//defer request.Release()
dest := v2net.UDPDestination(request.Address, request.Port)
log.Access(source, dest, log.AccessAccepted, "")
log.Info("Shadowsocks: Tunnelling request to ", dest)
this.udpServer.Dispatch(&proxy.SessionInfo{Source: source, Destination: dest}, request.DetachUDPPayload(), func(destination v2net.Destination, payload *alloc.Buffer) {
defer payload.Release()
response := alloc.NewBuffer().Slice(0, ivLen)
defer response.Release()
rand.Read(response.Value)
respIv := response.Value
stream, err := this.config.Cipher.NewEncodingStream(key, respIv)
if err != nil {
log.Error("Shadowsocks: Failed to create encoding stream: ", err)
return
}
writer := crypto.NewCryptionWriter(stream, response)
switch request.Address.Family() {
case v2net.AddressFamilyIPv4:
writer.Write([]byte{AddrTypeIPv4})
writer.Write(request.Address.IP())
case v2net.AddressFamilyIPv6:
writer.Write([]byte{AddrTypeIPv6})
writer.Write(request.Address.IP())
case v2net.AddressFamilyDomain:
writer.Write([]byte{AddrTypeDomain, byte(len(request.Address.Domain()))})
writer.Write([]byte(request.Address.Domain()))
}
writer.Write(request.Port.Bytes(nil))
writer.Write(payload.Value)
if request.OTA {
respAuth := NewAuthenticator(HeaderKeyGenerator(key, respIv))
respAuth.Authenticate(response.Value, response.Value[ivLen:])
}
this.udpHub.WriteTo(response.Value, source)
})
}
func (this *Server) handleConnection(conn internet.Connection) {
defer conn.Close()
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
timedReader := v2net.NewTimeOutReader(16, conn)
defer timedReader.Release()
bufferedReader := v2io.NewBufferedReader(timedReader)
defer bufferedReader.Release()
ivLen := this.config.Cipher.IVSize()
_, err := io.ReadFull(bufferedReader, buffer.Value[:ivLen])
if err != nil {
if err != io.EOF {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
log.Warning("Shadowsocks: Failed to read IV: ", err)
}
return
}
iv := buffer.Value[:ivLen]
key := this.config.Key
stream, err := this.config.Cipher.NewDecodingStream(key, iv)
if err != nil {
log.Error("Shadowsocks: Failed to create decoding stream: ", err)
return
}
reader := crypto.NewCryptionReader(stream, bufferedReader)
request, err := ReadRequest(reader, NewAuthenticator(HeaderKeyGenerator(key, iv)), false)
if err != nil {
log.Access(conn.RemoteAddr(), "", log.AccessRejected, err)
log.Warning("Shadowsocks: Invalid request from ", conn.RemoteAddr(), ": ", err)
return
}
defer request.Release()
bufferedReader.SetCached(false)
userSettings := protocol.GetUserSettings(this.config.Level)
timedReader.SetTimeOut(userSettings.PayloadReadTimeout)
dest := v2net.TCPDestination(request.Address, request.Port)
log.Access(conn.RemoteAddr(), dest, log.AccessAccepted, "")
log.Info("Shadowsocks: Tunnelling request to ", dest)
ray := this.packetDispatcher.DispatchToOutbound(this.meta, &proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
})
defer ray.InboundOutput().Release()
var writeFinish sync.Mutex
writeFinish.Lock()
go func() {
if payload, err := ray.InboundOutput().Read(); err == nil {
payload.SliceBack(ivLen)
rand.Read(payload.Value[:ivLen])
stream, err := this.config.Cipher.NewEncodingStream(key, payload.Value[:ivLen])
if err != nil {
log.Error("Shadowsocks: Failed to create encoding stream: ", err)
return
}
stream.XORKeyStream(payload.Value[ivLen:], payload.Value[ivLen:])
conn.Write(payload.Value)
payload.Release()
writer := crypto.NewCryptionWriter(stream, conn)
v2writer := v2io.NewAdaptiveWriter(writer)
v2io.Pipe(ray.InboundOutput(), v2writer)
writer.Release()
v2writer.Release()
}
writeFinish.Unlock()
}()
var payloadReader v2io.Reader
if request.OTA {
payloadAuth := NewAuthenticator(ChunkKeyGenerator(iv))
payloadReader = NewChunkReader(reader, payloadAuth)
} else {
payloadReader = v2io.NewAdaptiveReader(reader)
}
v2io.Pipe(payloadReader, ray.InboundInput())
ray.InboundInput().Close()
payloadReader.Release()
writeFinish.Lock()
}