func (v *Server) handleConnection(connection internet.Connection) {
defer connection.Close()
timedReader := v2net.NewTimeOutReader(v.config.Timeout, connection)
reader := bufio.NewReader(timedReader)
defer reader.Release()
writer := bufio.NewWriter(connection)
defer writer.Release()
auth, auth4, err := protocol.ReadAuthentication(reader)
if err != nil && errors.Cause(err) != protocol.Socks4Downgrade {
if errors.Cause(err) != io.EOF {
log.Warning("Socks: failed to read authentication: ", err)
}
return
}
clientAddr := v2net.DestinationFromAddr(connection.RemoteAddr())
if err != nil && err == protocol.Socks4Downgrade {
v.handleSocks4(clientAddr, reader, writer, auth4)
} else {
v.handleSocks5(clientAddr, reader, writer, auth)
}
}
func (this *FreedomConnection) Dispatch(destination v2net.Destination, payload *alloc.Buffer, ray ray.OutboundRay) error {
log.Info("Freedom: Opening connection to ", destination)
defer payload.Release()
defer ray.OutboundInput().Release()
defer ray.OutboundOutput().Close()
var conn internet.Connection
if this.domainStrategy == Config_USE_IP && destination.Address.Family().IsDomain() {
destination = this.ResolveIP(destination)
}
err := retry.ExponentialBackoff(5, 100).On(func() error {
rawConn, err := internet.Dial(this.meta.Address, destination, this.meta.GetDialerOptions())
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
log.Warning("Freedom: Failed to open connection to ", destination, ": ", err)
return err
}
defer conn.Close()
input := ray.OutboundInput()
output := ray.OutboundOutput()
if !payload.IsEmpty() {
conn.Write(payload.Value)
}
go func() {
v2writer := v2io.NewAdaptiveWriter(conn)
defer v2writer.Release()
v2io.Pipe(input, v2writer)
if tcpConn, ok := conn.(*tcp.RawConnection); ok {
tcpConn.CloseWrite()
}
}()
var reader io.Reader = conn
timeout := this.timeout
if destination.Network == v2net.Network_UDP {
timeout = 16
}
if timeout > 0 {
reader = v2net.NewTimeOutReader(timeout /* seconds */, conn)
}
v2reader := v2io.NewAdaptiveReader(reader)
v2io.Pipe(v2reader, output)
v2reader.Release()
ray.OutboundOutput().Close()
return nil
}
func (this *VMessOutboundHandler) Dispatch(target v2net.Destination, payload *alloc.Buffer, ray ray.OutboundRay) error {
defer ray.OutboundInput().Release()
defer ray.OutboundOutput().Close()
var rec *protocol.ServerSpec
var conn internet.Connection
err := retry.Timed(5, 100).On(func() error {
rec = this.serverPicker.PickServer()
rawConn, err := internet.Dial(this.meta.Address, rec.Destination(), this.meta.StreamSettings)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
log.Error("VMess|Outbound: Failed to find an available destination:", err)
return err
}
log.Info("VMess|Outbound: Tunneling request to ", target, " via ", rec.Destination())
command := protocol.RequestCommandTCP
if target.IsUDP() {
command = protocol.RequestCommandUDP
}
request := &protocol.RequestHeader{
Version: encoding.Version,
User: rec.PickUser(),
Command: command,
Address: target.Address(),
Port: target.Port(),
Option: protocol.RequestOptionChunkStream,
}
defer conn.Close()
conn.SetReusable(true)
if conn.Reusable() { // Conn reuse may be disabled on transportation layer
request.Option.Set(protocol.RequestOptionConnectionReuse)
}
input := ray.OutboundInput()
output := ray.OutboundOutput()
var requestFinish, responseFinish sync.Mutex
requestFinish.Lock()
responseFinish.Lock()
session := encoding.NewClientSession(protocol.DefaultIDHash)
go this.handleRequest(session, conn, request, payload, input, &requestFinish)
go this.handleResponse(session, conn, request, rec.Destination(), output, &responseFinish)
requestFinish.Lock()
responseFinish.Lock()
return nil
}
func (v *DokodemoDoor) HandleTCPConnection(conn internet.Connection) {
defer conn.Close()
var dest v2net.Destination
if v.config.FollowRedirect {
originalDest := GetOriginalDestination(conn)
if originalDest.Network != v2net.Network_Unknown {
log.Info("Dokodemo: Following redirect to: ", originalDest)
dest = originalDest
}
}
if dest.Network == v2net.Network_Unknown && v.address != nil && v.port > v2net.Port(0) {
dest = v2net.TCPDestination(v.address, v.port)
}
if dest.Network == v2net.Network_Unknown {
log.Info("Dokodemo: Unknown destination, stop forwarding...")
return
}
log.Info("Dokodemo: Handling request to ", dest)
ray := v.packetDispatcher.DispatchToOutbound(&proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
Inbound: v.meta,
})
defer ray.InboundOutput().Release()
var wg sync.WaitGroup
reader := v2net.NewTimeOutReader(v.config.Timeout, conn)
defer reader.Release()
wg.Add(1)
go func() {
v2reader := buf.NewReader(reader)
defer v2reader.Release()
if err := buf.PipeUntilEOF(v2reader, ray.InboundInput()); err != nil {
log.Info("Dokodemo: Failed to transport all TCP request: ", err)
}
wg.Done()
ray.InboundInput().Close()
}()
wg.Add(1)
go func() {
v2writer := buf.NewWriter(conn)
defer v2writer.Release()
if err := buf.PipeUntilEOF(ray.InboundOutput(), v2writer); err != nil {
log.Info("Dokodemo: Failed to transport all TCP response: ", err)
}
wg.Done()
}()
wg.Wait()
}
func (this *DokodemoDoor) HandleTCPConnection(conn internet.Connection) {
defer conn.Close()
var dest v2net.Destination
if this.config.FollowRedirect {
originalDest := GetOriginalDestination(conn)
if originalDest.Network != v2net.Network_Unknown {
log.Info("Dokodemo: Following redirect to: ", originalDest)
dest = originalDest
}
}
if dest.Network == v2net.Network_Unknown && this.address != nil && this.port > v2net.Port(0) {
dest = v2net.TCPDestination(this.address, this.port)
}
if dest.Network == v2net.Network_Unknown {
log.Info("Dokodemo: Unknown destination, stop forwarding...")
return
}
log.Info("Dokodemo: Handling request to ", dest)
ray := this.packetDispatcher.DispatchToOutbound(&proxy.SessionInfo{
Source: v2net.DestinationFromAddr(conn.RemoteAddr()),
Destination: dest,
Inbound: this.meta,
})
defer ray.InboundOutput().Release()
var wg sync.WaitGroup
reader := v2net.NewTimeOutReader(this.config.Timeout, conn)
defer reader.Release()
wg.Add(1)
go func() {
v2reader := v2io.NewAdaptiveReader(reader)
defer v2reader.Release()
v2io.Pipe(v2reader, ray.InboundInput())
wg.Done()
ray.InboundInput().Close()
}()
wg.Add(1)
go func() {
v2writer := v2io.NewAdaptiveWriter(conn)
defer v2writer.Release()
v2io.Pipe(ray.InboundOutput(), v2writer)
wg.Done()
}()
wg.Wait()
}
func (w *tcpWorker) callback(conn internet.Connection) {
ctx, cancel := context.WithCancel(w.ctx)
if w.recvOrigDest {
dest := tcp.GetOriginalDestination(conn)
if dest.IsValid() {
ctx = proxy.ContextWithOriginalDestination(ctx, dest)
}
}
if len(w.tag) > 0 {
ctx = proxy.ContextWithInboundTag(ctx, w.tag)
}
ctx = proxy.ContextWithAllowPassiveConnection(ctx, w.allowPassiveConn)
ctx = proxy.ContextWithInboundDestination(ctx, v2net.TCPDestination(w.address, w.port))
w.proxy.Process(ctx, v2net.Network_TCP, conn)
cancel()
conn.Close()
}
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 (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 (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) 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()
}
func (v *VMessOutboundHandler) Dispatch(target v2net.Destination, payload *buf.Buffer, ray ray.OutboundRay) {
defer ray.OutboundInput().Release()
defer ray.OutboundOutput().Close()
var rec *protocol.ServerSpec
var conn internet.Connection
err := retry.ExponentialBackoff(5, 100).On(func() error {
rec = v.serverPicker.PickServer()
rawConn, err := internet.Dial(v.meta.Address, rec.Destination(), v.meta.GetDialerOptions())
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
log.Warning("VMess|Outbound: Failed to find an available destination:", err)
return
}
log.Info("VMess|Outbound: Tunneling request to ", target, " via ", rec.Destination())
command := protocol.RequestCommandTCP
if target.Network == v2net.Network_UDP {
command = protocol.RequestCommandUDP
}
request := &protocol.RequestHeader{
Version: encoding.Version,
User: rec.PickUser(),
Command: command,
Address: target.Address,
Port: target.Port,
Option: protocol.RequestOptionChunkStream,
}
rawAccount, err := request.User.GetTypedAccount()
if err != nil {
log.Warning("VMess|Outbound: Failed to get user account: ", err)
}
account := rawAccount.(*vmess.InternalAccount)
request.Security = account.Security
defer conn.Close()
conn.SetReusable(true)
if conn.Reusable() { // Conn reuse may be disabled on transportation layer
request.Option.Set(protocol.RequestOptionConnectionReuse)
}
input := ray.OutboundInput()
output := ray.OutboundOutput()
var requestFinish, responseFinish sync.Mutex
requestFinish.Lock()
responseFinish.Lock()
session := encoding.NewClientSession(protocol.DefaultIDHash)
go v.handleRequest(session, conn, request, payload, input, &requestFinish)
go v.handleResponse(session, conn, request, rec.Destination(), output, &responseFinish)
requestFinish.Lock()
responseFinish.Lock()
return
}
func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay) error {
destination := proxy.DestinationFromContext(ctx)
if v.destOverride != nil {
server := v.destOverride.Server
destination = net.Destination{
Network: destination.Network,
Address: server.Address.AsAddress(),
Port: net.Port(server.Port),
}
}
log.Info("Freedom: Opening connection to ", destination)
input := outboundRay.OutboundInput()
output := outboundRay.OutboundOutput()
var conn internet.Connection
if v.domainStrategy == Config_USE_IP && destination.Address.Family().IsDomain() {
destination = v.ResolveIP(destination)
}
dialer := proxy.DialerFromContext(ctx)
err := retry.ExponentialBackoff(5, 100).On(func() error {
rawConn, err := dialer.Dial(ctx, destination)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
log.Warning("Freedom: Failed to open connection to ", destination, ": ", err)
return err
}
defer conn.Close()
conn.SetReusable(false)
requestDone := signal.ExecuteAsync(func() error {
v2writer := buf.NewWriter(conn)
if err := buf.PipeUntilEOF(input, v2writer); err != nil {
return err
}
return nil
})
var reader io.Reader = conn
timeout := v.timeout
if destination.Network == net.Network_UDP {
timeout = 16
}
if timeout > 0 {
reader = net.NewTimeOutReader(timeout /* seconds */, conn)
}
responseDone := signal.ExecuteAsync(func() error {
defer output.Close()
v2reader := buf.NewReader(reader)
if err := buf.PipeUntilEOF(v2reader, output); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
log.Info("Freedom: Connection ending with ", err)
input.CloseError()
output.CloseError()
return err
}
return nil
}
// Dispatch implements OutboundHandler.Dispatch().
func (v *VMessOutboundHandler) Process(ctx context.Context, outboundRay ray.OutboundRay) error {
var rec *protocol.ServerSpec
var conn internet.Connection
dialer := proxy.DialerFromContext(ctx)
err := retry.ExponentialBackoff(5, 100).On(func() error {
rec = v.serverPicker.PickServer()
rawConn, err := dialer.Dial(ctx, rec.Destination())
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
log.Warning("VMess|Outbound: Failed to find an available destination:", err)
return err
}
defer conn.Close()
target := proxy.DestinationFromContext(ctx)
log.Info("VMess|Outbound: Tunneling request to ", target, " via ", rec.Destination())
command := protocol.RequestCommandTCP
if target.Network == net.Network_UDP {
command = protocol.RequestCommandUDP
}
request := &protocol.RequestHeader{
Version: encoding.Version,
User: rec.PickUser(),
Command: command,
Address: target.Address,
Port: target.Port,
Option: protocol.RequestOptionChunkStream,
}
rawAccount, err := request.User.GetTypedAccount()
if err != nil {
log.Warning("VMess|Outbound: Failed to get user account: ", err)
return err
}
account := rawAccount.(*vmess.InternalAccount)
request.Security = account.Security
conn.SetReusable(true)
if conn.Reusable() { // Conn reuse may be disabled on transportation layer
request.Option.Set(protocol.RequestOptionConnectionReuse)
}
input := outboundRay.OutboundInput()
output := outboundRay.OutboundOutput()
session := encoding.NewClientSession(protocol.DefaultIDHash)
requestDone := signal.ExecuteAsync(func() error {
writer := bufio.NewWriter(conn)
session.EncodeRequestHeader(request, writer)
bodyWriter := session.EncodeRequestBody(request, writer)
firstPayload, err := input.ReadTimeout(time.Millisecond * 500)
if err != nil && err != ray.ErrReadTimeout {
return errors.Base(err).Message("VMess|Outbound: Failed to get first payload.")
}
if !firstPayload.IsEmpty() {
if err := bodyWriter.Write(firstPayload); err != nil {
return errors.Base(err).Message("VMess|Outbound: Failed to write first payload.")
}
firstPayload.Release()
}
writer.SetBuffered(false)
if err := buf.PipeUntilEOF(input, bodyWriter); err != nil {
return err
}
if request.Option.Has(protocol.RequestOptionChunkStream) {
if err := bodyWriter.Write(buf.NewLocal(8)); err != nil {
return err
}
}
return nil
})
responseDone := signal.ExecuteAsync(func() error {
defer output.Close()
reader := bufio.NewReader(conn)
header, err := session.DecodeResponseHeader(reader)
if err != nil {
return err
}
v.handleCommand(rec.Destination(), header.Command)
conn.SetReusable(header.Option.Has(protocol.ResponseOptionConnectionReuse))
reader.SetBuffered(false)
bodyReader := session.DecodeResponseBody(request, reader)
if err := buf.PipeUntilEOF(bodyReader, output); err != nil {
return err
}
return nil
})
if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
log.Info("VMess|Outbound: Connection ending with ", err)
conn.SetReusable(false)
input.CloseError()
output.CloseError()
return err
}
return nil
}
func (c *Client) Process(ctx context.Context, ray ray.OutboundRay) error {
destination := proxy.DestinationFromContext(ctx)
var server *protocol.ServerSpec
var conn internet.Connection
dialer := proxy.DialerFromContext(ctx)
err := retry.ExponentialBackoff(5, 100).On(func() error {
server = c.serverPicker.PickServer()
dest := server.Destination()
rawConn, err := dialer.Dial(ctx, dest)
if err != nil {
return err
}
conn = rawConn
return nil
})
if err != nil {
log.Warning("Socks|Client: Failed to find an available destination.")
return err
}
defer conn.Close()
conn.SetReusable(false)
request := &protocol.RequestHeader{
Version: socks5Version,
Command: protocol.RequestCommandTCP,
Address: destination.Address,
Port: destination.Port,
}
if destination.Network == net.Network_UDP {
request.Command = protocol.RequestCommandUDP
}
user := server.PickUser()
if user != nil {
request.User = user
}
udpRequest, err := ClientHandshake(request, conn, conn)
if err != nil {
log.Warning("Socks|Client: Failed to establish connection to server: ", err)
return err
}
var requestFunc func() error
var responseFunc func() error
if request.Command == protocol.RequestCommandTCP {
requestFunc = func() error {
return buf.PipeUntilEOF(ray.OutboundInput(), buf.NewWriter(conn))
}
responseFunc = func() error {
defer ray.OutboundOutput().Close()
return buf.PipeUntilEOF(buf.NewReader(conn), ray.OutboundOutput())
}
} else if request.Command == protocol.RequestCommandUDP {
udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
if err != nil {
log.Info("Socks|Client: Failed to create UDP connection: ", err)
return err
}
defer udpConn.Close()
requestFunc = func() error {
return buf.PipeUntilEOF(ray.OutboundInput(), &UDPWriter{request: request, writer: udpConn})
}
responseFunc = func() error {
defer ray.OutboundOutput().Close()
reader := &UDPReader{reader: net.NewTimeOutReader(16, udpConn)}
return buf.PipeUntilEOF(reader, ray.OutboundOutput())
}
}
requestDone := signal.ExecuteAsync(requestFunc)
responseDone := signal.ExecuteAsync(responseFunc)
if err := signal.ErrorOrFinish2(requestDone, responseDone); err != nil {
log.Info("Socks|Client: Connection ends with ", err)
ray.OutboundInput().CloseError()
ray.OutboundOutput().CloseError()
return err
}
return nil
}