mirror of
https://github.com/SagerNet/sing-box.git
synced 2026-05-13 13:57:05 +00:00
115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
package proxybridge
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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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E "github.com/sagernet/sing/common/exceptions"
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"github.com/sagernet/sing/common/logger"
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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/protocol/socks"
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"github.com/sagernet/sing/service"
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)
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type Bridge struct {
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ctx context.Context
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logger logger.ContextLogger
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tag string
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dialer N.Dialer
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connection adapter.ConnectionManager
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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 New(ctx context.Context, logger logger.ContextLogger, tag string, dialer N.Dialer) (*Bridge, error) {
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username := randomHex(16)
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password := randomHex(16)
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tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{IP: net.IPv4(127, 0, 0, 1)})
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if err != nil {
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return nil, err
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}
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bridge := &Bridge{
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ctx: ctx,
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logger: logger,
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tag: tag,
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dialer: dialer,
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connection: service.FromContext[adapter.ConnectionManager](ctx),
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tcpListener: tcpListener,
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username: username,
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password: password,
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authenticator: auth.NewAuthenticator([]auth.User{{Username: username, Password: password}}),
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}
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go bridge.acceptLoop()
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return bridge, nil
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}
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func randomHex(size int) string {
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raw := make([]byte, size)
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rand.Read(raw)
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return hex.EncodeToString(raw)
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}
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func (b *Bridge) Port() uint16 {
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return M.SocksaddrFromNet(b.tcpListener.Addr()).Port
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}
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func (b *Bridge) Username() string {
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return b.username
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}
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func (b *Bridge) Password() string {
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return b.password
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}
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func (b *Bridge) Close() error {
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return common.Close(b.tcpListener)
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}
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func (b *Bridge) acceptLoop() {
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for {
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tcpConn, err := b.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(b.ctx)
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go func() {
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hErr := socks.HandleConnectionEx(ctx, tcpConn, std_bufio.NewReader(tcpConn), b.authenticator, b, nil, 0, M.SocksaddrFromNet(tcpConn.RemoteAddr()), nil)
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if hErr == nil {
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return
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}
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if E.IsClosedOrCanceled(hErr) {
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b.logger.DebugContext(ctx, E.Cause(hErr, b.tag, " connection closed"))
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return
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}
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b.logger.ErrorContext(ctx, E.Cause(hErr, b.tag))
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}()
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}
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}
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func (b *Bridge) NewConnectionEx(ctx context.Context, conn net.Conn, source M.Socksaddr, destination M.Socksaddr, onClose N.CloseHandlerFunc) {
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var metadata adapter.InboundContext
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metadata.Source = source
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metadata.Destination = destination
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metadata.Network = N.NetworkTCP
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b.logger.InfoContext(ctx, b.tag, " connection to ", metadata.Destination)
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b.connection.NewConnection(ctx, b.dialer, conn, metadata, onClose)
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}
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func (b *Bridge) NewPacketConnectionEx(ctx context.Context, conn N.PacketConn, source M.Socksaddr, destination M.Socksaddr, onClose N.CloseHandlerFunc) {
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var metadata adapter.InboundContext
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metadata.Source = source
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metadata.Destination = destination
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metadata.Network = N.NetworkUDP
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b.logger.InfoContext(ctx, b.tag, " packet connection to ", metadata.Destination)
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b.connection.NewPacketConnection(ctx, b.dialer, conn, metadata, onClose)
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}
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