132 lines
3.6 KiB
Go
132 lines
3.6 KiB
Go
package outbound
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import (
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std_bufio "bufio"
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"context"
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"crypto/rand"
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"encoding/hex"
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"net"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/auth"
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"github.com/sagernet/sing/common/buf"
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"github.com/sagernet/sing/common/bufio"
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E "github.com/sagernet/sing/common/exceptions"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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"github.com/sagernet/sing/common/rw"
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"github.com/sagernet/sing/protocol/http"
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"github.com/sagernet/sing/protocol/socks"
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"github.com/sagernet/sing/protocol/socks/socks4"
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"github.com/sagernet/sing/protocol/socks/socks5"
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)
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type ProxyListener struct {
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ctx context.Context
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logger log.ContextLogger
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dialer N.Dialer
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tcpListener *net.TCPListener
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username string
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password string
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authenticator *auth.Authenticator
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}
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func NewProxyListener(ctx context.Context, logger log.ContextLogger, dialer N.Dialer) *ProxyListener {
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var usernameB [64]byte
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var passwordB [64]byte
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rand.Read(usernameB[:])
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rand.Read(passwordB[:])
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username := hex.EncodeToString(usernameB[:])
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password := hex.EncodeToString(passwordB[:])
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return &ProxyListener{
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ctx: ctx,
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logger: logger,
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dialer: dialer,
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authenticator: auth.NewAuthenticator([]auth.User{{Username: username, Password: password}}),
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username: username,
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password: password,
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}
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}
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func (l *ProxyListener) Start() error {
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tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{
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IP: net.IPv4(127, 0, 0, 1),
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})
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if err != nil {
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return err
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}
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l.tcpListener = tcpListener
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go l.acceptLoop()
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return nil
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}
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func (l *ProxyListener) Port() uint16 {
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if l.tcpListener == nil {
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panic("start listener first")
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}
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return M.SocksaddrFromNet(l.tcpListener.Addr()).Port
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}
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func (l *ProxyListener) Username() string {
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return l.username
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}
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func (l *ProxyListener) Password() string {
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return l.password
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}
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func (l *ProxyListener) Close() error {
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return common.Close(l.tcpListener)
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}
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func (l *ProxyListener) acceptLoop() {
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for {
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tcpConn, err := l.tcpListener.AcceptTCP()
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if err != nil {
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return
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}
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ctx := log.ContextWithNewID(l.ctx)
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go func() {
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hErr := l.accept(ctx, tcpConn)
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if hErr != nil {
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if E.IsClosedOrCanceled(hErr) {
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l.logger.DebugContext(ctx, E.Cause(hErr, "proxy connection closed"))
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return
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}
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l.logger.ErrorContext(ctx, E.Cause(hErr, "proxy"))
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}
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}()
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}
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}
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func (l *ProxyListener) accept(ctx context.Context, conn *net.TCPConn) error {
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headerType, err := rw.ReadByte(conn)
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if err != nil {
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return err
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}
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switch headerType {
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case socks4.Version, socks5.Version:
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return socks.HandleConnection0(ctx, conn, headerType, l.authenticator, l, M.Metadata{})
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}
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reader := std_bufio.NewReader(bufio.NewCachedReader(conn, buf.As([]byte{headerType})))
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return http.HandleConnection(ctx, conn, reader, l.authenticator, l, M.Metadata{})
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}
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func (l *ProxyListener) NewConnection(ctx context.Context, conn net.Conn, upstreamMetadata M.Metadata) error {
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var metadata adapter.InboundContext
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metadata.Network = N.NetworkTCP
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metadata.Destination = upstreamMetadata.Destination
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l.logger.InfoContext(ctx, "proxy connection to ", metadata.Destination)
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return NewConnection(ctx, l.dialer, conn, metadata)
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}
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func (l *ProxyListener) NewPacketConnection(ctx context.Context, conn N.PacketConn, upstreamMetadata M.Metadata) error {
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var metadata adapter.InboundContext
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metadata.Network = N.NetworkUDP
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metadata.Destination = upstreamMetadata.Destination
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l.logger.InfoContext(ctx, "proxy packet connection to ", metadata.Destination)
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return NewPacketConnection(ctx, l.dialer, conn, metadata)
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}
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