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mux.go
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mux.go
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package mux
//go:generate go run $GOPATH/src/v2ray.com/core/tools/generrorgen/main.go -pkg mux -path App,Proxyman,Mux
import (
"context"
"io"
"sync"
"time"
"v2ray.com/core/app"
"v2ray.com/core/app/dispatcher"
"v2ray.com/core/app/log"
"v2ray.com/core/app/proxyman"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/errors"
"v2ray.com/core/common/net"
"v2ray.com/core/common/signal"
"v2ray.com/core/proxy"
"v2ray.com/core/transport/ray"
)
const (
maxTotal = 128
)
type ClientManager struct {
access sync.Mutex
clients []*Client
proxy proxy.Outbound
dialer proxy.Dialer
config *proxyman.MultiplexingConfig
}
func NewClientManager(p proxy.Outbound, d proxy.Dialer, c *proxyman.MultiplexingConfig) *ClientManager {
return &ClientManager{
proxy: p,
dialer: d,
config: c,
}
}
func (m *ClientManager) Dispatch(ctx context.Context, outboundRay ray.OutboundRay) error {
m.access.Lock()
defer m.access.Unlock()
for _, client := range m.clients {
if client.Dispatch(ctx, outboundRay) {
return nil
}
}
client, err := NewClient(m.proxy, m.dialer, m)
if err != nil {
return newError("failed to create client").Base(err)
}
m.clients = append(m.clients, client)
client.Dispatch(ctx, outboundRay)
return nil
}
func (m *ClientManager) onClientFinish() {
m.access.Lock()
defer m.access.Unlock()
activeClients := make([]*Client, 0, len(m.clients))
for _, client := range m.clients {
if !client.Closed() {
activeClients = append(activeClients, client)
}
}
m.clients = activeClients
}
type Client struct {
sessionManager *SessionManager
inboundRay ray.InboundRay
ctx context.Context
cancel context.CancelFunc
manager *ClientManager
session2Remove chan uint16
concurrency uint32
}
var muxCoolDestination = net.TCPDestination(net.DomainAddress("v1.mux.cool"), net.Port(9527))
func NewClient(p proxy.Outbound, dialer proxy.Dialer, m *ClientManager) (*Client, error) {
ctx, cancel := context.WithCancel(context.Background())
ctx = proxy.ContextWithTarget(ctx, muxCoolDestination)
pipe := ray.NewRay(ctx)
go p.Process(ctx, pipe, dialer)
c := &Client{
sessionManager: NewSessionManager(),
inboundRay: pipe,
ctx: ctx,
cancel: cancel,
manager: m,
session2Remove: make(chan uint16, 16),
concurrency: m.config.Concurrency,
}
go c.fetchOutput()
go c.monitor()
return c, nil
}
func (m *Client) Closed() bool {
select {
case <-m.ctx.Done():
return true
default:
return false
}
}
func (m *Client) monitor() {
defer m.manager.onClientFinish()
for {
select {
case <-m.ctx.Done():
m.sessionManager.Close()
m.inboundRay.InboundInput().Close()
m.inboundRay.InboundOutput().CloseError()
return
case <-time.After(time.Second * 16):
size := m.sessionManager.Size()
if size == 0 && m.sessionManager.CloseIfNoSession() {
m.cancel()
}
}
}
}
func fetchInput(ctx context.Context, s *Session, output buf.Writer) {
dest, _ := proxy.TargetFromContext(ctx)
writer := &Writer{
dest: dest,
id: s.ID,
writer: output,
}
defer writer.Close()
defer s.CloseUplink()
log.Trace(newError("dispatching request to ", dest))
data, _ := s.input.ReadTimeout(time.Millisecond * 500)
if err := writer.Write(data); err != nil {
log.Trace(newError("failed to write first payload").Base(err))
return
}
if err := buf.Copy(signal.BackgroundTimer(), s.input, writer); err != nil {
log.Trace(newError("failed to fetch all input").Base(err))
}
}
func (m *Client) Dispatch(ctx context.Context, outboundRay ray.OutboundRay) bool {
sm := m.sessionManager
if sm.Size() >= int(m.concurrency) || sm.Count() >= maxTotal {
return false
}
select {
case <-m.ctx.Done():
return false
default:
}
s := sm.Allocate()
if s == nil {
return false
}
s.input = outboundRay.OutboundInput()
s.output = outboundRay.OutboundOutput()
go fetchInput(ctx, s, m.inboundRay.InboundInput())
return true
}
func drain(reader *Reader) error {
data, err := reader.Read()
if err != nil {
return err
}
data.Release()
return nil
}
func pipe(reader *Reader, writer buf.Writer) error {
data, err := reader.Read()
if err != nil {
return err
}
return writer.Write(data)
}
func (m *Client) handleStatueKeepAlive(meta *FrameMetadata, reader *Reader) error {
if meta.Option.Has(OptionData) {
return drain(reader)
}
return nil
}
func (m *Client) handleStatusNew(meta *FrameMetadata, reader *Reader) error {
if meta.Option.Has(OptionData) {
return drain(reader)
}
return nil
}
func (m *Client) handleStatusKeep(meta *FrameMetadata, reader *Reader) error {
if !meta.Option.Has(OptionData) {
return nil
}
if s, found := m.sessionManager.Get(meta.SessionID); found {
return pipe(reader, s.output)
}
return drain(reader)
}
func (m *Client) handleStatusEnd(meta *FrameMetadata, reader *Reader) error {
if s, found := m.sessionManager.Get(meta.SessionID); found {
s.CloseDownlink()
s.output.Close()
}
if meta.Option.Has(OptionData) {
return drain(reader)
}
return nil
}
func (m *Client) fetchOutput() {
defer m.cancel()
reader := NewReader(m.inboundRay.InboundOutput())
for {
meta, err := reader.ReadMetadata()
if err != nil {
if errors.Cause(err) != io.EOF {
log.Trace(newError("failed to read metadata").Base(err))
}
break
}
switch meta.SessionStatus {
case SessionStatusKeepAlive:
err = m.handleStatueKeepAlive(meta, reader)
case SessionStatusEnd:
err = m.handleStatusEnd(meta, reader)
case SessionStatusNew:
err = m.handleStatusNew(meta, reader)
case SessionStatusKeep:
err = m.handleStatusKeep(meta, reader)
default:
log.Trace(newError("unknown status: ", meta.SessionStatus).AtWarning())
return
}
if err != nil {
log.Trace(newError("failed to process data").Base(err))
return
}
}
}
type Server struct {
dispatcher dispatcher.Interface
}
func NewServer(ctx context.Context) *Server {
s := &Server{}
space := app.SpaceFromContext(ctx)
space.OnInitialize(func() error {
d := dispatcher.FromSpace(space)
if d == nil {
return newError("no dispatcher in space")
}
s.dispatcher = d
return nil
})
return s
}
func (s *Server) Dispatch(ctx context.Context, dest net.Destination) (ray.InboundRay, error) {
if dest != muxCoolDestination {
return s.dispatcher.Dispatch(ctx, dest)
}
ray := ray.NewRay(ctx)
worker := &ServerWorker{
dispatcher: s.dispatcher,
outboundRay: ray,
sessionManager: NewSessionManager(),
}
go worker.run(ctx)
return ray, nil
}
type ServerWorker struct {
dispatcher dispatcher.Interface
outboundRay ray.OutboundRay
sessionManager *SessionManager
}
func handle(ctx context.Context, s *Session, output buf.Writer) {
writer := NewResponseWriter(s.ID, output)
if err := buf.Copy(signal.BackgroundTimer(), s.input, writer); err != nil {
log.Trace(newError("session ", s.ID, " ends: ").Base(err))
}
writer.Close()
s.CloseDownlink()
}
func (w *ServerWorker) handleStatusKeepAlive(meta *FrameMetadata, reader *Reader) error {
if meta.Option.Has(OptionData) {
return drain(reader)
}
return nil
}
func (w *ServerWorker) handleStatusNew(ctx context.Context, meta *FrameMetadata, reader *Reader) error {
log.Trace(newError("received request for ", meta.Target))
inboundRay, err := w.dispatcher.Dispatch(ctx, meta.Target)
if err != nil {
if meta.Option.Has(OptionData) {
drain(reader)
}
return newError("failed to dispatch request.").Base(err)
}
s := &Session{
input: inboundRay.InboundOutput(),
output: inboundRay.InboundInput(),
parent: w.sessionManager,
ID: meta.SessionID,
}
w.sessionManager.Add(s)
go handle(ctx, s, w.outboundRay.OutboundOutput())
if meta.Option.Has(OptionData) {
return pipe(reader, s.output)
}
return nil
}
func (w *ServerWorker) handleStatusKeep(meta *FrameMetadata, reader *Reader) error {
if !meta.Option.Has(OptionData) {
return nil
}
if s, found := w.sessionManager.Get(meta.SessionID); found {
return pipe(reader, s.output)
}
return drain(reader)
}
func (w *ServerWorker) handleStatusEnd(meta *FrameMetadata, reader *Reader) error {
if s, found := w.sessionManager.Get(meta.SessionID); found {
s.CloseUplink()
s.output.Close()
}
if meta.Option.Has(OptionData) {
return drain(reader)
}
return nil
}
func (w *ServerWorker) run(ctx context.Context) {
input := w.outboundRay.OutboundInput()
reader := NewReader(input)
defer w.sessionManager.Close()
for {
select {
case <-ctx.Done():
return
default:
}
meta, err := reader.ReadMetadata()
if err != nil {
log.Trace(newError("failed to read metadata").Base(err))
return
}
switch meta.SessionStatus {
case SessionStatusKeepAlive:
err = w.handleStatusKeepAlive(meta, reader)
case SessionStatusEnd:
err = w.handleStatusEnd(meta, reader)
case SessionStatusNew:
err = w.handleStatusNew(ctx, meta, reader)
case SessionStatusKeep:
err = w.handleStatusKeep(meta, reader)
default:
log.Trace(newError("unknown status: ", meta.SessionStatus).AtWarning())
return
}
if err != nil {
log.Trace(newError("failed to process data").Base(err))
return
}
}
}