github.com/sagernet/sing-box@v1.2.7/outbound/trojan.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  	"github.com/sagernet/sing-box/common/mux"
    10  	"github.com/sagernet/sing-box/common/tls"
    11  	C "github.com/sagernet/sing-box/constant"
    12  	"github.com/sagernet/sing-box/log"
    13  	"github.com/sagernet/sing-box/option"
    14  	"github.com/sagernet/sing-box/transport/trojan"
    15  	"github.com/sagernet/sing-box/transport/v2ray"
    16  	"github.com/sagernet/sing/common"
    17  	"github.com/sagernet/sing/common/bufio"
    18  	E "github.com/sagernet/sing/common/exceptions"
    19  	M "github.com/sagernet/sing/common/metadata"
    20  	N "github.com/sagernet/sing/common/network"
    21  )
    22  
    23  var _ adapter.Outbound = (*Trojan)(nil)
    24  
    25  type Trojan struct {
    26  	myOutboundAdapter
    27  	dialer          N.Dialer
    28  	serverAddr      M.Socksaddr
    29  	key             [56]byte
    30  	multiplexDialer N.Dialer
    31  	tlsConfig       tls.Config
    32  	transport       adapter.V2RayClientTransport
    33  }
    34  
    35  func NewTrojan(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TrojanOutboundOptions) (*Trojan, error) {
    36  	outbound := &Trojan{
    37  		myOutboundAdapter: myOutboundAdapter{
    38  			protocol: C.TypeTrojan,
    39  			network:  options.Network.Build(),
    40  			router:   router,
    41  			logger:   logger,
    42  			tag:      tag,
    43  		},
    44  		dialer:     dialer.New(router, options.DialerOptions),
    45  		serverAddr: options.ServerOptions.Build(),
    46  		key:        trojan.Key(options.Password),
    47  	}
    48  	var err error
    49  	if options.TLS != nil {
    50  		outbound.tlsConfig, err = tls.NewClient(router, options.Server, common.PtrValueOrDefault(options.TLS))
    51  		if err != nil {
    52  			return nil, err
    53  		}
    54  	}
    55  	if options.Transport != nil {
    56  		outbound.transport, err = v2ray.NewClientTransport(ctx, outbound.dialer, outbound.serverAddr, common.PtrValueOrDefault(options.Transport), outbound.tlsConfig)
    57  		if err != nil {
    58  			return nil, E.Cause(err, "create client transport: ", options.Transport.Type)
    59  		}
    60  	}
    61  	outbound.multiplexDialer, err = mux.NewClientWithOptions(ctx, (*trojanDialer)(outbound), common.PtrValueOrDefault(options.Multiplex))
    62  	if err != nil {
    63  		return nil, err
    64  	}
    65  	return outbound, nil
    66  }
    67  
    68  func (h *Trojan) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
    69  	if h.multiplexDialer == nil {
    70  		switch N.NetworkName(network) {
    71  		case N.NetworkTCP:
    72  			h.logger.InfoContext(ctx, "outbound connection to ", destination)
    73  		case N.NetworkUDP:
    74  			h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
    75  		}
    76  		return (*trojanDialer)(h).DialContext(ctx, network, destination)
    77  	} else {
    78  		switch N.NetworkName(network) {
    79  		case N.NetworkTCP:
    80  			h.logger.InfoContext(ctx, "outbound multiplex connection to ", destination)
    81  		case N.NetworkUDP:
    82  			h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
    83  		}
    84  		return h.multiplexDialer.DialContext(ctx, network, destination)
    85  	}
    86  }
    87  
    88  func (h *Trojan) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
    89  	if h.multiplexDialer == nil {
    90  		h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
    91  		return (*trojanDialer)(h).ListenPacket(ctx, destination)
    92  	} else {
    93  		h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
    94  		return h.multiplexDialer.ListenPacket(ctx, destination)
    95  	}
    96  }
    97  
    98  func (h *Trojan) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
    99  	return NewConnection(ctx, h, conn, metadata)
   100  }
   101  
   102  func (h *Trojan) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
   103  	return NewPacketConnection(ctx, h, conn, metadata)
   104  }
   105  
   106  func (h *Trojan) Close() error {
   107  	return common.Close(h.multiplexDialer, h.transport)
   108  }
   109  
   110  type trojanDialer Trojan
   111  
   112  func (h *trojanDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
   113  	ctx, metadata := adapter.AppendContext(ctx)
   114  	metadata.Outbound = h.tag
   115  	metadata.Destination = destination
   116  	var conn net.Conn
   117  	var err error
   118  	if h.transport != nil {
   119  		conn, err = h.transport.DialContext(ctx)
   120  	} else {
   121  		conn, err = h.dialer.DialContext(ctx, N.NetworkTCP, h.serverAddr)
   122  		if err == nil && h.tlsConfig != nil {
   123  			conn, err = tls.ClientHandshake(ctx, conn, h.tlsConfig)
   124  		}
   125  	}
   126  	if err != nil {
   127  		common.Close(conn)
   128  		return nil, err
   129  	}
   130  	switch N.NetworkName(network) {
   131  	case N.NetworkTCP:
   132  		return trojan.NewClientConn(conn, h.key, destination), nil
   133  	case N.NetworkUDP:
   134  		return bufio.NewBindPacketConn(trojan.NewClientPacketConn(conn, h.key), destination), nil
   135  	default:
   136  		return nil, E.Extend(N.ErrUnknownNetwork, network)
   137  	}
   138  }
   139  
   140  func (h *trojanDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
   141  	conn, err := h.DialContext(ctx, N.NetworkUDP, destination)
   142  	if err != nil {
   143  		return nil, err
   144  	}
   145  	return conn.(net.PacketConn), nil
   146  }