mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-10 02:53:12 +00:00
117 lines
3.7 KiB
Go
117 lines
3.7 KiB
Go
package outbound
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import (
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"context"
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"net"
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"net/netip"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/dialer"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
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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/pires/go-proxyproto"
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)
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var _ adapter.Outbound = (*Direct)(nil)
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type Direct struct {
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myOutboundAdapter
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dialer N.Dialer
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overrideOption int
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overrideDestination M.Socksaddr
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proxyProto uint8
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}
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func NewDirect(router adapter.Router, logger log.ContextLogger, tag string, options option.DirectOutboundOptions) (*Direct, error) {
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outbound := &Direct{
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myOutboundAdapter: myOutboundAdapter{
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protocol: C.TypeDirect,
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network: []string{N.NetworkTCP, N.NetworkUDP},
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router: router,
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logger: logger,
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tag: tag,
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},
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dialer: dialer.NewOutbound(router, options.OutboundDialerOptions),
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proxyProto: options.ProxyProtocol,
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}
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if options.ProxyProtocol > 2 {
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return nil, E.New("invalid proxy protocol option: ", options.ProxyProtocol)
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}
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if options.OverrideAddress != "" && options.OverridePort != 0 {
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outbound.overrideOption = 1
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outbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
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} else if options.OverrideAddress != "" {
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outbound.overrideOption = 2
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outbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
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} else if options.OverridePort != 0 {
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outbound.overrideOption = 3
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outbound.overrideDestination = M.Socksaddr{Port: options.OverridePort}
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}
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return outbound, nil
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}
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func (h *Direct) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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ctx, metadata := adapter.AppendContext(ctx)
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originDestination := metadata.Destination
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metadata.Outbound = h.tag
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metadata.Destination = destination
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switch h.overrideOption {
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case 1:
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destination = h.overrideDestination
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case 2:
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newDestination := h.overrideDestination
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newDestination.Port = destination.Port
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destination = newDestination
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case 3:
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destination.Port = h.overrideDestination.Port
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}
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network = N.NetworkName(network)
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switch network {
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case N.NetworkTCP:
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h.logger.InfoContext(ctx, "outbound connection to ", destination)
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case N.NetworkUDP:
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h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
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}
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conn, err := h.dialer.DialContext(ctx, network, destination)
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if err != nil {
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return nil, err
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}
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if h.proxyProto > 0 {
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source := metadata.Source
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if !source.IsValid() {
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source = M.SocksaddrFromNet(conn.LocalAddr())
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}
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if originDestination.Addr.Is6() {
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source = M.SocksaddrFrom(netip.AddrFrom16(source.Addr.As16()), source.Port)
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}
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header := proxyproto.HeaderProxyFromAddrs(h.proxyProto, source.TCPAddr(), originDestination.TCPAddr())
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_, err = header.WriteTo(conn)
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if err != nil {
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conn.Close()
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return nil, E.Cause(err, "write proxy protocol header")
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}
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}
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return conn, nil
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}
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func (h *Direct) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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ctx, metadata := adapter.AppendContext(ctx)
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metadata.Outbound = h.tag
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metadata.Destination = destination
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h.logger.InfoContext(ctx, "outbound packet connection")
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return h.dialer.ListenPacket(ctx, destination)
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}
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func (h *Direct) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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return NewConnection(ctx, h, conn, metadata)
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}
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func (h *Direct) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
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return NewPacketConnection(ctx, h, conn, metadata)
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}
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