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listener.go
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listener.go
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package kcp
import (
"context"
"crypto/cipher"
"crypto/tls"
"sync"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/transport/internet"
v2tls "v2ray.com/core/transport/internet/tls"
"v2ray.com/core/transport/internet/udp"
)
type ConnectionID struct {
Remote net.Address
Port net.Port
Conv uint16
}
// Listener defines a server listening for connections
type Listener struct {
sync.Mutex
sessions map[ConnectionID]*Connection
hub *udp.Hub
tlsConfig *tls.Config
config *Config
reader PacketReader
header internet.PacketHeader
security cipher.AEAD
addConn internet.ConnHandler
}
func NewListener(ctx context.Context, address net.Address, port net.Port, addConn internet.ConnHandler) (*Listener, error) {
networkSettings := internet.TransportSettingsFromContext(ctx)
kcpSettings := networkSettings.(*Config)
header, err := kcpSettings.GetPackerHeader()
if err != nil {
return nil, newError("failed to create packet header").Base(err).AtError()
}
security, err := kcpSettings.GetSecurity()
if err != nil {
return nil, newError("failed to create security").Base(err).AtError()
}
l := &Listener{
header: header,
security: security,
reader: &KCPPacketReader{
Header: header,
Security: security,
},
sessions: make(map[ConnectionID]*Connection),
config: kcpSettings,
addConn: addConn,
}
if config := v2tls.ConfigFromContext(ctx); config != nil {
l.tlsConfig = config.GetTLSConfig()
}
hub, err := udp.ListenUDP(address, port, udp.HubCapacity(1024))
if err != nil {
return nil, err
}
l.Lock()
l.hub = hub
l.Unlock()
newError("listening on ", address, ":", port).WriteToLog()
go l.handlePackets()
return l, nil
}
func (l *Listener) handlePackets() {
receive := l.hub.Receive()
for payload := range receive {
l.OnReceive(payload.Content, payload.Source)
}
}
func (l *Listener) OnReceive(payload *buf.Buffer, src net.Destination) {
segments := l.reader.Read(payload.Bytes())
payload.Release()
if len(segments) == 0 {
newError("discarding invalid payload from ", src).WriteToLog()
return
}
conv := segments[0].Conversation()
cmd := segments[0].Command()
id := ConnectionID{
Remote: src.Address,
Port: src.Port,
Conv: conv,
}
l.Lock()
defer l.Unlock()
conn, found := l.sessions[id]
if !found {
if cmd == CommandTerminate {
return
}
writer := &Writer{
id: id,
hub: l.hub,
dest: src,
listener: l,
}
remoteAddr := &net.UDPAddr{
IP: src.Address.IP(),
Port: int(src.Port),
}
localAddr := l.hub.Addr()
conn = NewConnection(ConnMetadata{
LocalAddr: localAddr,
RemoteAddr: remoteAddr,
Conversation: conv,
}, &KCPPacketWriter{
Header: l.header,
Security: l.security,
Writer: writer,
}, writer, l.config)
var netConn internet.Connection = conn
if l.tlsConfig != nil {
tlsConn := tls.Server(conn, l.tlsConfig)
netConn = tlsConn
}
l.addConn(netConn)
l.sessions[id] = conn
}
conn.Input(segments)
}
func (l *Listener) Remove(id ConnectionID) {
l.Lock()
delete(l.sessions, id)
l.Unlock()
}
// Close stops listening on the UDP address. Already Accepted connections are not closed.
func (l *Listener) Close() error {
l.hub.Close()
l.Lock()
defer l.Unlock()
for _, conn := range l.sessions {
go conn.Terminate()
}
return nil
}
func (l *Listener) ActiveConnections() int {
l.Lock()
defer l.Unlock()
return len(l.sessions)
}
// Addr returns the listener's network address, The Addr returned is shared by all invocations of Addr, so do not modify it.
func (l *Listener) Addr() net.Addr {
return l.hub.Addr()
}
type Writer struct {
id ConnectionID
dest net.Destination
hub *udp.Hub
listener *Listener
}
func (w *Writer) Write(payload []byte) (int, error) {
return w.hub.WriteTo(payload, w.dest)
}
func (w *Writer) Close() error {
w.listener.Remove(w.id)
return nil
}
func ListenKCP(ctx context.Context, address net.Address, port net.Port, addConn internet.ConnHandler) (internet.Listener, error) {
return NewListener(ctx, address, port, addConn)
}
func init() {
common.Must(internet.RegisterTransportListener(protocolName, ListenKCP))
}