func init() {
common.Must(internet.RegisterTransportDialer(internet.TransportProtocol_UDP,
func(ctx context.Context, dest v2net.Destination) (internet.Connection, error) {
src := internet.DialerSourceFromContext(ctx)
conn, err := internet.DialSystem(src, dest)
if err != nil {
return nil, err
}
// TODO: handle dialer options
return internal.NewConnection(internal.NewConnectionID(src, dest), conn, internal.NoOpConnectionRecyler{}, internal.ReuseConnection(false)), nil
}))
}
func DialKCP(ctx context.Context, dest v2net.Destination) (internet.Connection, error) {
dest.Network = v2net.Network_UDP
log.Info("KCP|Dialer: Dialing KCP to ", dest)
src := internet.DialerSourceFromContext(ctx)
id := internal.NewConnectionID(src, dest)
conn := globalPool.Get(id)
if conn == nil {
rawConn, err := internet.DialSystem(src, dest)
if err != nil {
log.Error("KCP|Dialer: Failed to dial to dest: ", err)
return nil, err
}
c := &ClientConnection{
Conn: rawConn,
id: id,
}
go c.Run()
conn = c
}
kcpSettings := internet.TransportSettingsFromContext(ctx).(*Config)
clientConn := conn.(*ClientConnection)
header, err := kcpSettings.GetPackerHeader()
if err != nil {
return nil, errors.Base(err).Message("KCP|Dialer: Failed to create packet header.")
}
security, err := kcpSettings.GetSecurity()
if err != nil {
return nil, errors.Base(err).Message("KCP|Dialer: Failed to create security.")
}
clientConn.ResetSecurity(header, security)
conv := uint16(atomic.AddUint32(&globalConv, 1))
session := NewConnection(conv, clientConn, globalPool, kcpSettings)
var iConn internet.Connection
iConn = session
if securitySettings := internet.SecuritySettingsFromContext(ctx); securitySettings != nil {
switch securitySettings := securitySettings.(type) {
case *v2tls.Config:
config := securitySettings.GetTLSConfig()
if dest.Address.Family().IsDomain() {
config.ServerName = dest.Address.Domain()
}
tlsConn := tls.Client(iConn, config)
iConn = UnreusableConnection{Conn: tlsConn}
}
}
return iConn, nil
}
func Dial(ctx context.Context, dest v2net.Destination) (internet.Connection, error) {
log.Info("Internet|TCP: Dailing TCP to ", dest)
src := internet.DialerSourceFromContext(ctx)
tcpSettings := internet.TransportSettingsFromContext(ctx).(*Config)
id := internal.NewConnectionID(src, dest)
var conn net.Conn
if dest.Network == v2net.Network_TCP && tcpSettings.IsConnectionReuse() {
conn = globalCache.Get(id)
}
if conn == nil {
var err error
conn, err = internet.DialSystem(src, dest)
if err != nil {
return nil, err
}
if securitySettings := internet.SecuritySettingsFromContext(ctx); securitySettings != nil {
tlsConfig, ok := securitySettings.(*v2tls.Config)
if ok {
config := tlsConfig.GetTLSConfig()
if dest.Address.Family().IsDomain() {
config.ServerName = dest.Address.Domain()
}
conn = tls.Client(conn, config)
}
}
if tcpSettings.HeaderSettings != nil {
headerConfig, err := tcpSettings.HeaderSettings.GetInstance()
if err != nil {
return nil, errors.Base(err).Message("Interent|TCP: Failed to get header settings.")
}
auth, err := internet.CreateConnectionAuthenticator(headerConfig)
if err != nil {
return nil, errors.Base(err).Message("Internet|TCP: Failed to create header authenticator.")
}
conn = auth.Client(conn)
}
}
return internal.NewConnection(id, conn, globalCache, internal.ReuseConnection(tcpSettings.IsConnectionReuse())), nil
}
func Dial(ctx context.Context, dest v2net.Destination) (internet.Connection, error) {
log.Info("WebSocket|Dialer: Creating connection to ", dest)
src := internet.DialerSourceFromContext(ctx)
wsSettings := internet.TransportSettingsFromContext(ctx).(*Config)
id := internal.NewConnectionID(src, dest)
var conn *wsconn
if dest.Network == v2net.Network_TCP && wsSettings.IsConnectionReuse() {
connt := globalCache.Get(id)
if connt != nil {
conn = connt.(*wsconn)
}
}
if conn == nil {
var err error
conn, err = wsDial(ctx, dest)
if err != nil {
log.Warning("WebSocket|Dialer: Dial failed: ", err)
return nil, err
}
}
return internal.NewConnection(id, conn, globalCache, internal.ReuseConnection(wsSettings.IsConnectionReuse())), nil
}
func (v *Listener) OnReceive(payload *buf.Buffer, src v2net.Destination, originalDest v2net.Destination) {
defer payload.Release()
segments := v.reader.Read(payload.Bytes())
if len(segments) == 0 {
log.Info("KCP|Listener: discarding invalid payload from ", src)
return
}
if !v.running {
return
}
v.Lock()
defer v.Unlock()
if !v.running {
return
}
if payload.Len() < 4 {
return
}
conv := segments[0].Conversation()
cmd := segments[0].Command()
id := ConnectionID{
Remote: src.Address,
Port: src.Port,
Conv: conv,
}
conn, found := v.sessions[id]
if !found {
if cmd == CommandTerminate {
return
}
writer := &Writer{
id: id,
hub: v.hub,
dest: src,
listener: v,
}
remoteAddr := &net.UDPAddr{
IP: src.Address.IP(),
Port: int(src.Port),
}
localAddr := v.hub.Addr()
sConn := &ServerConnection{
id: internal.NewConnectionID(v2net.LocalHostIP, src),
local: localAddr,
remote: remoteAddr,
writer: &KCPPacketWriter{
Header: v.header,
Writer: writer,
Security: v.security,
},
closer: writer,
}
conn = NewConnection(conv, sConn, v, v.config)
select {
case v.awaitingConns <- conn:
case <-time.After(time.Second * 5):
conn.Close()
return
}
v.sessions[id] = conn
}
conn.Input(segments)
}
