github.com/sagernet/sing-box@v1.9.0-rc.20/outbound/socks.go (about)

     1  package outbound
     2  
     3  import (
     4  	"context"
     5  	"net"
     6  
     7  	"github.com/sagernet/sing-box/adapter"
     8  	"github.com/sagernet/sing-box/common/dialer"
     9  	C "github.com/sagernet/sing-box/constant"
    10  	"github.com/sagernet/sing-box/log"
    11  	"github.com/sagernet/sing-box/option"
    12  	"github.com/sagernet/sing-dns"
    13  	"github.com/sagernet/sing/common"
    14  	E "github.com/sagernet/sing/common/exceptions"
    15  	M "github.com/sagernet/sing/common/metadata"
    16  	N "github.com/sagernet/sing/common/network"
    17  	"github.com/sagernet/sing/common/uot"
    18  	"github.com/sagernet/sing/protocol/socks"
    19  )
    20  
    21  var _ adapter.Outbound = (*Socks)(nil)
    22  
    23  type Socks struct {
    24  	myOutboundAdapter
    25  	client    *socks.Client
    26  	resolve   bool
    27  	uotClient *uot.Client
    28  }
    29  
    30  func NewSocks(router adapter.Router, logger log.ContextLogger, tag string, options option.SocksOutboundOptions) (*Socks, error) {
    31  	var version socks.Version
    32  	var err error
    33  	if options.Version != "" {
    34  		version, err = socks.ParseVersion(options.Version)
    35  	} else {
    36  		version = socks.Version5
    37  	}
    38  	if err != nil {
    39  		return nil, err
    40  	}
    41  	outboundDialer, err := dialer.New(router, options.DialerOptions)
    42  	if err != nil {
    43  		return nil, err
    44  	}
    45  	outbound := &Socks{
    46  		myOutboundAdapter: myOutboundAdapter{
    47  			protocol:     C.TypeSOCKS,
    48  			network:      options.Network.Build(),
    49  			router:       router,
    50  			logger:       logger,
    51  			tag:          tag,
    52  			dependencies: withDialerDependency(options.DialerOptions),
    53  		},
    54  		client:  socks.NewClient(outboundDialer, options.ServerOptions.Build(), version, options.Username, options.Password),
    55  		resolve: version == socks.Version4,
    56  	}
    57  	uotOptions := common.PtrValueOrDefault(options.UDPOverTCP)
    58  	if uotOptions.Enabled {
    59  		outbound.uotClient = &uot.Client{
    60  			Dialer:  outbound.client,
    61  			Version: uotOptions.Version,
    62  		}
    63  	}
    64  	return outbound, nil
    65  }
    66  
    67  func (h *Socks) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
    68  	ctx, metadata := adapter.AppendContext(ctx)
    69  	metadata.Outbound = h.tag
    70  	metadata.Destination = destination
    71  	switch N.NetworkName(network) {
    72  	case N.NetworkTCP:
    73  		h.logger.InfoContext(ctx, "outbound connection to ", destination)
    74  	case N.NetworkUDP:
    75  		if h.uotClient != nil {
    76  			h.logger.InfoContext(ctx, "outbound UoT connect packet connection to ", destination)
    77  			return h.uotClient.DialContext(ctx, network, destination)
    78  		}
    79  		h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
    80  	default:
    81  		return nil, E.Extend(N.ErrUnknownNetwork, network)
    82  	}
    83  	if h.resolve && destination.IsFqdn() {
    84  		destinationAddresses, err := h.router.LookupDefault(ctx, destination.Fqdn)
    85  		if err != nil {
    86  			return nil, err
    87  		}
    88  		return N.DialSerial(ctx, h.client, network, destination, destinationAddresses)
    89  	}
    90  	return h.client.DialContext(ctx, network, destination)
    91  }
    92  
    93  func (h *Socks) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
    94  	ctx, metadata := adapter.AppendContext(ctx)
    95  	metadata.Outbound = h.tag
    96  	metadata.Destination = destination
    97  	if h.uotClient != nil {
    98  		h.logger.InfoContext(ctx, "outbound UoT packet connection to ", destination)
    99  		return h.uotClient.ListenPacket(ctx, destination)
   100  	}
   101  	if h.resolve && destination.IsFqdn() {
   102  		destinationAddresses, err := h.router.LookupDefault(ctx, destination.Fqdn)
   103  		if err != nil {
   104  			return nil, err
   105  		}
   106  		packetConn, _, err := N.ListenSerial(ctx, h.client, destination, destinationAddresses)
   107  		if err != nil {
   108  			return nil, err
   109  		}
   110  		return packetConn, nil
   111  	}
   112  	h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
   113  	return h.client.ListenPacket(ctx, destination)
   114  }
   115  
   116  func (h *Socks) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
   117  	if h.resolve {
   118  		return NewDirectConnection(ctx, h.router, h, conn, metadata, dns.DomainStrategyUseIPv4)
   119  	} else {
   120  		return NewConnection(ctx, h, conn, metadata)
   121  	}
   122  }
   123  
   124  func (h *Socks) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
   125  	if h.resolve {
   126  		return NewDirectPacketConnection(ctx, h.router, h, conn, metadata, dns.DomainStrategyUseIPv4)
   127  	} else {
   128  		return NewPacketConnection(ctx, h, conn, metadata)
   129  	}
   130  }