2016-06-17 10:51:41 -04:00
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package kcp
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import (
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"crypto/tls"
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"net"
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"sync"
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"time"
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"v2ray.com/core/common/alloc"
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"v2ray.com/core/common/log"
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v2net "v2ray.com/core/common/net"
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"v2ray.com/core/common/serial"
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"v2ray.com/core/proxy"
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"v2ray.com/core/transport/internet"
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v2tls "v2ray.com/core/transport/internet/tls"
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"v2ray.com/core/transport/internet/udp"
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)
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// Listener defines a server listening for connections
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type Listener struct {
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sync.Mutex
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running bool
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authenticator internet.Authenticator
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sessions map[string]*Connection
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awaitingConns chan *Connection
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hub *udp.UDPHub
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tlsConfig *tls.Config
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config *Config
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}
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func NewListener(address v2net.Address, port v2net.Port, options internet.ListenOptions) (*Listener, error) {
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networkSettings, err := options.Stream.GetEffectiveNetworkSettings()
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if err != nil {
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log.Error("KCP|Listener: Failed to get KCP settings: ", err)
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return nil, err
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}
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kcpSettings := networkSettings.(*Config)
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auth, err := kcpSettings.GetAuthenticator()
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if err != nil {
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return nil, err
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}
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l := &Listener{
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authenticator: auth,
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sessions: make(map[string]*Connection),
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awaitingConns: make(chan *Connection, 64),
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running: true,
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config: kcpSettings,
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}
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if options.Stream != nil && options.Stream.SecurityType == internet.SecurityType_TLS {
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securitySettings, err := options.Stream.GetEffectiveSecuritySettings()
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if err != nil {
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log.Error("KCP|Listener: Failed to apply TLS config: ", err)
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return nil, err
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}
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l.tlsConfig = securitySettings.(*v2tls.Config).GetTLSConfig()
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}
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hub, err := udp.ListenUDP(address, port, udp.ListenOption{Callback: l.OnReceive})
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if err != nil {
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return nil, err
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}
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l.hub = hub
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log.Info("KCP|Listener: listening on ", address, ":", port)
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return l, nil
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}
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func (this *Listener) OnReceive(payload *alloc.Buffer, session *proxy.SessionInfo) {
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defer payload.Release()
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src := session.Source
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if valid := this.authenticator.Open(payload); !valid {
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log.Info("KCP|Listener: discarding invalid payload from ", src)
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return
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}
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if !this.running {
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return
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}
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this.Lock()
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defer this.Unlock()
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if !this.running {
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return
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}
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if payload.Len() < 4 {
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return
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}
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conv := serial.BytesToUint16(payload.Value)
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cmd := Command(payload.Value[2])
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sourceId := src.NetAddr() + "|" + serial.Uint16ToString(conv)
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conn, found := this.sessions[sourceId]
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if !found {
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if cmd == CommandTerminate {
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return
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}
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log.Debug("KCP|Listener: Creating session with id(", sourceId, ") from ", src)
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writer := &Writer{
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id: sourceId,
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hub: this.hub,
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dest: src,
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listener: this,
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}
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srcAddr := &net.UDPAddr{
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IP: src.Address.IP(),
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Port: int(src.Port),
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}
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auth, err := this.config.GetAuthenticator()
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if err != nil {
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log.Error("KCP|Listener: Failed to create authenticator: ", err)
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}
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conn = NewConnection(conv, writer, this.Addr().(*net.UDPAddr), srcAddr, auth, this.config)
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select {
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case this.awaitingConns <- conn:
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case <-time.After(time.Second * 5):
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conn.Close()
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return
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}
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this.sessions[sourceId] = conn
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}
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conn.Input(payload.Value)
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}
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func (this *Listener) Remove(dest string) {
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if !this.running {
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return
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}
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this.Lock()
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defer this.Unlock()
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if !this.running {
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return
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}
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log.Debug("KCP|Listener: Removing session ", dest)
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delete(this.sessions, dest)
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}
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// Accept implements the Accept method in the Listener interface; it waits for the next call and returns a generic Conn.
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func (this *Listener) Accept() (internet.Connection, error) {
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for {
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if !this.running {
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return nil, ErrClosedListener
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}
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select {
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case conn := <-this.awaitingConns:
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if this.tlsConfig != nil {
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tlsConn := tls.Server(conn, this.tlsConfig)
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return v2tls.NewConnection(tlsConn), nil
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}
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return conn, nil
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case <-time.After(time.Second):
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}
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}
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}
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// Close stops listening on the UDP address. Already Accepted connections are not closed.
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func (this *Listener) Close() error {
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if !this.running {
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return ErrClosedListener
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}
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this.Lock()
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defer this.Unlock()
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this.running = false
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close(this.awaitingConns)
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for _, conn := range this.sessions {
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go conn.Terminate()
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}
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this.hub.Close()
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return nil
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}
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func (this *Listener) ActiveConnections() int {
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this.Lock()
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defer this.Unlock()
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return len(this.sessions)
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}
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// Addr returns the listener's network address, The Addr returned is shared by all invocations of Addr, so do not modify it.
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func (this *Listener) Addr() net.Addr {
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return this.hub.Addr()
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}
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type Writer struct {
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id string
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dest v2net.Destination
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hub *udp.UDPHub
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listener *Listener
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}
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func (this *Writer) Write(payload []byte) (int, error) {
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return this.hub.WriteTo(payload, this.dest)
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}
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func (this *Writer) Close() error {
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this.listener.Remove(this.id)
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return nil
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}
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func ListenKCP(address v2net.Address, port v2net.Port, options internet.ListenOptions) (internet.Listener, error) {
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return NewListener(address, port, options)
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}
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func init() {
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internet.KCPListenFunc = ListenKCP
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}
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