refactor: Modular inbounds/outbounds

protocol/tor/proxy.go

@@ -0,0 +1,119 @@
+package tor
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"net"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/adapter/outbound"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/auth"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/protocol/socks"
+)
+
+type ProxyListener struct {
+	ctx           context.Context
+	logger        log.ContextLogger
+	dialer        N.Dialer
+	tcpListener   *net.TCPListener
+	username      string
+	password      string
+	authenticator *auth.Authenticator
+}
+
+func NewProxyListener(ctx context.Context, logger log.ContextLogger, dialer N.Dialer) *ProxyListener {
+	var usernameB [64]byte
+	var passwordB [64]byte
+	rand.Read(usernameB[:])
+	rand.Read(passwordB[:])
+	username := hex.EncodeToString(usernameB[:])
+	password := hex.EncodeToString(passwordB[:])
+	return &ProxyListener{
+		ctx:           ctx,
+		logger:        logger,
+		dialer:        dialer,
+		authenticator: auth.NewAuthenticator([]auth.User{{Username: username, Password: password}}),
+		username:      username,
+		password:      password,
+	}
+}
+
+func (l *ProxyListener) Start() error {
+	tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{
+		IP: net.IPv4(127, 0, 0, 1),
+	})
+	if err != nil {
+		return err
+	}
+	l.tcpListener = tcpListener
+	go l.acceptLoop()
+	return nil
+}
+
+func (l *ProxyListener) Port() uint16 {
+	if l.tcpListener == nil {
+		panic("start listener first")
+	}
+	return M.SocksaddrFromNet(l.tcpListener.Addr()).Port
+}
+
+func (l *ProxyListener) Username() string {
+	return l.username
+}
+
+func (l *ProxyListener) Password() string {
+	return l.password
+}
+
+func (l *ProxyListener) Close() error {
+	return common.Close(l.tcpListener)
+}
+
+func (l *ProxyListener) acceptLoop() {
+	for {
+		tcpConn, err := l.tcpListener.AcceptTCP()
+		if err != nil {
+			return
+		}
+		ctx := log.ContextWithNewID(l.ctx)
+		go func() {
+			hErr := l.accept(ctx, tcpConn)
+			if hErr != nil {
+				if E.IsClosedOrCanceled(hErr) {
+					l.logger.DebugContext(ctx, E.Cause(hErr, "proxy connection closed"))
+					return
+				}
+				l.logger.ErrorContext(ctx, E.Cause(hErr, "proxy"))
+			}
+		}()
+	}
+}
+
+// TODO: migrate to new api
+//
+//nolint:staticcheck
+func (l *ProxyListener) accept(ctx context.Context, conn *net.TCPConn) error {
+	return socks.HandleConnection(ctx, conn, l.authenticator, l, M.Metadata{})
+}
+
+func (l *ProxyListener) NewConnection(ctx context.Context, conn net.Conn, upstreamMetadata M.Metadata) error {
+	var metadata adapter.InboundContext
+	metadata.Network = N.NetworkTCP
+	metadata.Destination = upstreamMetadata.Destination
+	l.logger.InfoContext(ctx, "proxy connection to ", metadata.Destination)
+	return outbound.NewConnection(ctx, l.dialer, conn, metadata)
+}
+
+func (l *ProxyListener) NewPacketConnection(ctx context.Context, conn N.PacketConn, upstreamMetadata M.Metadata) error {
+	var metadata adapter.InboundContext
+	metadata.Network = N.NetworkUDP
+	metadata.Destination = upstreamMetadata.Destination
+	l.logger.InfoContext(ctx, "proxy packet connection to ", metadata.Destination)
+	return outbound.NewPacketConnection(ctx, l.dialer, conn, metadata)
+}