Xray-core/transport/internet/tcp/hub.go

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2020-11-25 11:01:53 +00:00
// +build !confonly
package tcp
import (
"context"
gotls "crypto/tls"
"strings"
"time"
goxtls "github.com/xtls/go"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/tls"
"github.com/xtls/xray-core/transport/internet/xtls"
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)
// Listener is an internet.Listener that listens for TCP connections.
type Listener struct {
listener net.Listener
tlsConfig *gotls.Config
xtlsConfig *goxtls.Config
authConfig internet.ConnectionAuthenticator
config *Config
addConn internet.ConnHandler
locker *internet.FileLocker // for unix domain socket
}
// ListenTCP creates a new Listener based on configurations.
func ListenTCP(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, handler internet.ConnHandler) (internet.Listener, error) {
l := &Listener{
addConn: handler,
}
tcpSettings := streamSettings.ProtocolSettings.(*Config)
l.config = tcpSettings
if l.config != nil {
if streamSettings.SocketSettings == nil {
streamSettings.SocketSettings = &internet.SocketConfig{}
}
streamSettings.SocketSettings.AcceptProxyProtocol = l.config.AcceptProxyProtocol
}
var listener net.Listener
var err error
if port == net.Port(0) { //unix
listener, err = internet.ListenSystem(ctx, &net.UnixAddr{
Name: address.Domain(),
Net: "unix",
}, streamSettings.SocketSettings)
if err != nil {
return nil, newError("failed to listen Unix Doman Socket on ", address).Base(err)
}
newError("listening Unix Domain Socket on ", address).WriteToLog(session.ExportIDToError(ctx))
locker := ctx.Value(address.Domain())
if locker != nil {
l.locker = locker.(*internet.FileLocker)
}
} else {
listener, err = internet.ListenSystem(ctx, &net.TCPAddr{
IP: address.IP(),
Port: int(port),
}, streamSettings.SocketSettings)
if err != nil {
return nil, newError("failed to listen TCP on ", address, ":", port).Base(err)
}
newError("listening TCP on ", address, ":", port).WriteToLog(session.ExportIDToError(ctx))
}
if streamSettings.SocketSettings != nil && streamSettings.SocketSettings.AcceptProxyProtocol {
newError("accepting PROXY protocol").AtWarning().WriteToLog(session.ExportIDToError(ctx))
}
l.listener = listener
if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
l.tlsConfig = config.GetTLSConfig(tls.WithNextProto("h2"))
}
if config := xtls.ConfigFromStreamSettings(streamSettings); config != nil {
l.xtlsConfig = config.GetXTLSConfig(xtls.WithNextProto("h2"))
}
if tcpSettings.HeaderSettings != nil {
headerConfig, err := tcpSettings.HeaderSettings.GetInstance()
if err != nil {
return nil, newError("invalid header settings").Base(err).AtError()
}
auth, err := internet.CreateConnectionAuthenticator(headerConfig)
if err != nil {
return nil, newError("invalid header settings.").Base(err).AtError()
}
l.authConfig = auth
}
go l.keepAccepting()
return l, nil
}
func (v *Listener) keepAccepting() {
for {
conn, err := v.listener.Accept()
if err != nil {
errStr := err.Error()
if strings.Contains(errStr, "closed") {
break
}
newError("failed to accepted raw connections").Base(err).AtWarning().WriteToLog()
if strings.Contains(errStr, "too many") {
time.Sleep(time.Millisecond * 500)
}
continue
}
if v.tlsConfig != nil {
conn = tls.Server(conn, v.tlsConfig)
} else if v.xtlsConfig != nil {
conn = xtls.Server(conn, v.xtlsConfig)
}
if v.authConfig != nil {
conn = v.authConfig.Server(conn)
}
v.addConn(internet.Connection(conn))
}
}
// Addr implements internet.Listener.Addr.
func (v *Listener) Addr() net.Addr {
return v.listener.Addr()
}
// Close implements internet.Listener.Close.
func (v *Listener) Close() error {
if v.locker != nil {
v.locker.Release()
}
return v.listener.Close()
}
func init() {
common.Must(internet.RegisterTransportListener(protocolName, ListenTCP))
}