Xray-core/transport/internet/kcp/dialer.go

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2020-11-25 11:01:53 +00:00
// +build !confonly
package kcp
import (
"context"
"io"
"sync/atomic"
"github.com/xtls/xray-core/v1/common"
"github.com/xtls/xray-core/v1/common/buf"
"github.com/xtls/xray-core/v1/common/dice"
"github.com/xtls/xray-core/v1/common/net"
"github.com/xtls/xray-core/v1/transport/internet"
"github.com/xtls/xray-core/v1/transport/internet/tls"
"github.com/xtls/xray-core/v1/transport/internet/xtls"
)
var (
globalConv = uint32(dice.RollUint16())
)
func fetchInput(_ context.Context, input io.Reader, reader PacketReader, conn *Connection) {
cache := make(chan *buf.Buffer, 1024)
go func() {
for {
payload := buf.New()
if _, err := payload.ReadFrom(input); err != nil {
payload.Release()
close(cache)
return
}
select {
case cache <- payload:
default:
payload.Release()
}
}
}()
for payload := range cache {
segments := reader.Read(payload.Bytes())
payload.Release()
if len(segments) > 0 {
conn.Input(segments)
}
}
}
// DialKCP dials a new KCP connections to the specific destination.
func DialKCP(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (internet.Connection, error) {
dest.Network = net.Network_UDP
newError("dialing mKCP to ", dest).WriteToLog()
rawConn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
if err != nil {
return nil, newError("failed to dial to dest: ", err).AtWarning().Base(err)
}
kcpSettings := streamSettings.ProtocolSettings.(*Config)
header, err := kcpSettings.GetPackerHeader()
if err != nil {
return nil, newError("failed to create packet header").Base(err)
}
security, err := kcpSettings.GetSecurity()
if err != nil {
return nil, newError("failed to create security").Base(err)
}
reader := &KCPPacketReader{
Header: header,
Security: security,
}
writer := &KCPPacketWriter{
Header: header,
Security: security,
Writer: rawConn,
}
conv := uint16(atomic.AddUint32(&globalConv, 1))
session := NewConnection(ConnMetadata{
LocalAddr: rawConn.LocalAddr(),
RemoteAddr: rawConn.RemoteAddr(),
Conversation: conv,
}, writer, rawConn, kcpSettings)
go fetchInput(ctx, rawConn, reader, session)
var iConn internet.Connection = session
if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
iConn = tls.Client(iConn, config.GetTLSConfig(tls.WithDestination(dest)))
} else if config := xtls.ConfigFromStreamSettings(streamSettings); config != nil {
iConn = xtls.Client(iConn, config.GetXTLSConfig(xtls.WithDestination(dest)))
}
return iConn, nil
}
func init() {
common.Must(internet.RegisterTransportDialer(protocolName, DialKCP))
}