package tcp
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import (
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"context"
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gotls "crypto/tls"
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"strings"
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"time"
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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/serial"
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"github.com/v2fly/v2ray-core/v5/common/session"
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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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// Listener is an internet.Listener that listens for TCP connections.
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type Listener struct {
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listener net.Listener
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tlsConfig *gotls.Config
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authConfig internet.ConnectionAuthenticator
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config *Config
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addConn internet.ConnHandler
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locker *internet.FileLocker // for unix domain socket
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}
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// ListenTCP creates a new Listener based on configurations.
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func ListenTCP(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, handler internet.ConnHandler) (internet.Listener, error) {
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l := &Listener{
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addConn: handler,
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}
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tcpSettings := streamSettings.ProtocolSettings.(*Config)
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l.config = tcpSettings
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if l.config != nil {
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if streamSettings.SocketSettings == nil {
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streamSettings.SocketSettings = &internet.SocketConfig{}
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}
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streamSettings.SocketSettings.AcceptProxyProtocol = l.config.AcceptProxyProtocol
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}
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var listener net.Listener
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var err error
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if address.Family().IsDomain() {
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listener, err = internet.ListenSystem(ctx, &net.UnixAddr{
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Name: address.Domain(),
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Net: "unix",
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}, streamSettings.SocketSettings)
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if err != nil {
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return nil, newError("failed to listen Unix Domain Socket on ", address).Base(err)
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}
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newError("listening Unix Domain Socket on ", address).WriteToLog(session.ExportIDToError(ctx))
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locker := ctx.Value(address.Domain())
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if locker != nil {
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l.locker = locker.(*internet.FileLocker)
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}
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} else {
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listener, err = internet.ListenSystem(ctx, &net.TCPAddr{
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IP: address.IP(),
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Port: int(port),
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}, streamSettings.SocketSettings)
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if err != nil {
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return nil, newError("failed to listen TCP on ", address, ":", port).Base(err)
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}
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newError("listening TCP on ", address, ":", port).WriteToLog(session.ExportIDToError(ctx))
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}
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if streamSettings.SocketSettings != nil && streamSettings.SocketSettings.AcceptProxyProtocol {
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newError("accepting PROXY protocol").AtWarning().WriteToLog(session.ExportIDToError(ctx))
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}
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l.listener = listener
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if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
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l.tlsConfig = config.GetTLSConfig()
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}
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if tcpSettings.HeaderSettings != nil {
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headerConfig, err := serial.GetInstanceOf(tcpSettings.HeaderSettings)
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if err != nil {
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return nil, newError("invalid header settings").Base(err).AtError()
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}
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auth, err := internet.CreateConnectionAuthenticator(headerConfig)
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if err != nil {
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return nil, newError("invalid header settings.").Base(err).AtError()
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}
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l.authConfig = auth
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}
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go l.keepAccepting()
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return l, nil
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}
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func (v *Listener) keepAccepting() {
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for {
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conn, err := v.listener.Accept()
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if err != nil {
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errStr := err.Error()
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if strings.Contains(errStr, "closed") {
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break
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}
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newError("failed to accepted raw connections").Base(err).AtWarning().WriteToLog()
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if strings.Contains(errStr, "too many") {
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time.Sleep(time.Millisecond * 500)
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}
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continue
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}
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if v.tlsConfig != nil {
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conn = tls.Server(conn, v.tlsConfig)
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}
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if v.authConfig != nil {
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conn = v.authConfig.Server(conn)
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}
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v.addConn(internet.Connection(conn))
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}
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}
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// Addr implements internet.Listener.Addr.
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func (v *Listener) Addr() net.Addr {
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return v.listener.Addr()
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}
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// Close implements internet.Listener.Close.
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func (v *Listener) Close() error {
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if v.locker != nil {
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v.locker.Release()
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}
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return v.listener.Close()
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}
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func init() {
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common.Must(internet.RegisterTransportListener(protocolName, ListenTCP))
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}
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