package quic
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import (
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"context"
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"sync"
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"time"
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"github.com/lucas-clemente/quic-go"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/task"
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"github.com/v2fly/v2ray-core/v5/transport/internet"
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"github.com/v2fly/v2ray-core/v5/transport/internet/tls"
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)
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type connectionContext struct {
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rawConn *sysConn
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conn quic.Connection
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}
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var errConnectionClosed = newError("connection closed")
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func (c *connectionContext) openStream(destAddr net.Addr) (*interConn, error) {
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if !isActive(c.conn) {
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return nil, errConnectionClosed
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}
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stream, err := c.conn.OpenStream()
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if err != nil {
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return nil, err
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}
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conn := &interConn{
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stream: stream,
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local: c.conn.LocalAddr(),
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remote: destAddr,
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}
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return conn, nil
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}
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type clientConnections struct {
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access sync.Mutex
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conns map[net.Destination][]*connectionContext
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cleanup *task.Periodic
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}
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func isActive(s quic.Connection) bool {
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select {
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case <-s.Context().Done():
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return false
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default:
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return true
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}
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}
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func removeInactiveConnections(conns []*connectionContext) []*connectionContext {
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activeConnections := make([]*connectionContext, 0, len(conns))
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for _, s := range conns {
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if isActive(s.conn) {
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activeConnections = append(activeConnections, s)
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continue
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}
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if err := s.conn.CloseWithError(0, ""); err != nil {
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newError("failed to close connection").Base(err).WriteToLog()
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}
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if err := s.rawConn.Close(); err != nil {
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newError("failed to close raw connection").Base(err).WriteToLog()
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}
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}
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if len(activeConnections) < len(conns) {
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return activeConnections
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}
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return conns
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}
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func openStream(conns []*connectionContext, destAddr net.Addr) *interConn {
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for _, s := range conns {
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if !isActive(s.conn) {
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continue
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}
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conn, err := s.openStream(destAddr)
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if err != nil {
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continue
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}
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return conn
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}
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return nil
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}
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func (s *clientConnections) cleanConnections() error {
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s.access.Lock()
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defer s.access.Unlock()
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if len(s.conns) == 0 {
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return nil
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}
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newConnMap := make(map[net.Destination][]*connectionContext)
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for dest, conns := range s.conns {
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conns = removeInactiveConnections(conns)
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if len(conns) > 0 {
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newConnMap[dest] = conns
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}
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}
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s.conns = newConnMap
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return nil
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}
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func (s *clientConnections) openConnection(destAddr net.Addr, config *Config, tlsConfig *tls.Config, sockopt *internet.SocketConfig) (internet.Connection, error) {
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s.access.Lock()
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defer s.access.Unlock()
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if s.conns == nil {
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s.conns = make(map[net.Destination][]*connectionContext)
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}
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dest := net.DestinationFromAddr(destAddr)
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var conns []*connectionContext
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if s, found := s.conns[dest]; found {
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conns = s
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}
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{
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conn := openStream(conns, destAddr)
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if conn != nil {
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return conn, nil
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}
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}
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conns = removeInactiveConnections(conns)
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newError("dialing QUIC to ", dest).WriteToLog()
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rawConn, err := internet.ListenSystemPacket(context.Background(), &net.UDPAddr{
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IP: []byte{0, 0, 0, 0},
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Port: 0,
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}, sockopt)
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if err != nil {
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return nil, err
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}
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quicConfig := &quic.Config{
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ConnectionIDLength: 12,
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HandshakeIdleTimeout: time.Second * 8,
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MaxIdleTimeout: time.Second * 30,
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KeepAlivePeriod: time.Second * 15,
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}
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sysConn, err := wrapSysConn(rawConn.(*net.UDPConn), config)
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if err != nil {
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rawConn.Close()
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return nil, err
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}
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conn, err := quic.DialContext(context.Background(), sysConn, destAddr, "", tlsConfig.GetTLSConfig(tls.WithDestination(dest)), quicConfig)
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if err != nil {
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sysConn.Close()
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return nil, err
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}
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context := &connectionContext{
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conn: conn,
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rawConn: sysConn,
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}
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s.conns[dest] = append(conns, context)
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return context.openStream(destAddr)
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}
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var client clientConnections
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func init() {
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client.conns = make(map[net.Destination][]*connectionContext)
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client.cleanup = &task.Periodic{
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Interval: time.Minute,
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Execute: client.cleanConnections,
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}
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common.Must(client.cleanup.Start())
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}
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func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (internet.Connection, error) {
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tlsConfig := tls.ConfigFromStreamSettings(streamSettings)
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if tlsConfig == nil {
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tlsConfig = &tls.Config{
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ServerName: internalDomain,
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AllowInsecure: true,
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}
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}
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var destAddr *net.UDPAddr
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if dest.Address.Family().IsIP() {
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destAddr = &net.UDPAddr{
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IP: dest.Address.IP(),
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Port: int(dest.Port),
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}
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} else {
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addr, err := net.ResolveUDPAddr("udp", dest.NetAddr())
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if err != nil {
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return nil, err
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}
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destAddr = addr
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}
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config := streamSettings.ProtocolSettings.(*Config)
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return client.openConnection(destAddr, config, tlsConfig, streamSettings.SocketSettings)
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}
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func init() {
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common.Must(internet.RegisterTransportDialer(protocolName, Dial))
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}
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