sing-box/outbound/trojan.go

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package outbound
import (
"context"
"net"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/common/dialer"
"github.com/sagernet/sing-box/common/mux"
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"github.com/sagernet/sing-box/common/tls"
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C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing-box/transport/trojan"
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"github.com/sagernet/sing-box/transport/v2ray"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/bufio"
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E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
)
var _ adapter.Outbound = (*Trojan)(nil)
type Trojan struct {
myOutboundAdapter
dialer N.Dialer
serverAddr M.Socksaddr
key [56]byte
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multiplexDialer *mux.Client
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tlsConfig tls.Config
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transport adapter.V2RayClientTransport
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}
func NewTrojan(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TrojanOutboundOptions) (*Trojan, error) {
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outboundDialer, err := dialer.New(router, options.DialerOptions)
if err != nil {
return nil, err
}
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outbound := &Trojan{
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myOutboundAdapter: myOutboundAdapter{
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protocol: C.TypeTrojan,
network: options.Network.Build(),
router: router,
logger: logger,
tag: tag,
dependencies: withDialerDependency(options.DialerOptions),
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},
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dialer: outboundDialer,
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serverAddr: options.ServerOptions.Build(),
key: trojan.Key(options.Password),
}
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if options.TLS != nil {
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outbound.tlsConfig, err = tls.NewClient(ctx, options.Server, common.PtrValueOrDefault(options.TLS))
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if err != nil {
return nil, err
}
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}
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if options.Transport != nil {
outbound.transport, err = v2ray.NewClientTransport(ctx, outbound.dialer, outbound.serverAddr, common.PtrValueOrDefault(options.Transport), outbound.tlsConfig)
if err != nil {
return nil, E.Cause(err, "create client transport: ", options.Transport.Type)
}
}
outbound.multiplexDialer, err = mux.NewClientWithOptions((*trojanDialer)(outbound), logger, common.PtrValueOrDefault(options.Multiplex))
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if err != nil {
return nil, err
}
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return outbound, nil
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}
func (h *Trojan) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
if h.multiplexDialer == nil {
switch N.NetworkName(network) {
case N.NetworkTCP:
h.logger.InfoContext(ctx, "outbound connection to ", destination)
case N.NetworkUDP:
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
}
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return (*trojanDialer)(h).DialContext(ctx, network, destination)
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} else {
switch N.NetworkName(network) {
case N.NetworkTCP:
h.logger.InfoContext(ctx, "outbound multiplex connection to ", destination)
case N.NetworkUDP:
h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
}
return h.multiplexDialer.DialContext(ctx, network, destination)
}
}
func (h *Trojan) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
if h.multiplexDialer == nil {
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
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return (*trojanDialer)(h).ListenPacket(ctx, destination)
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} else {
h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
return h.multiplexDialer.ListenPacket(ctx, destination)
}
}
func (h *Trojan) 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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}
func (h *Trojan) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
return NewPacketConnection(ctx, h, conn, metadata)
}
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func (h *Trojan) InterfaceUpdated() {
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if h.transport != nil {
h.transport.Close()
}
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if h.multiplexDialer != nil {
h.multiplexDialer.Reset()
}
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return
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}
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func (h *Trojan) Close() error {
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return common.Close(common.PtrOrNil(h.multiplexDialer), h.transport)
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}
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type trojanDialer Trojan
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func (h *trojanDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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ctx, metadata := adapter.AppendContext(ctx)
metadata.Outbound = h.tag
metadata.Destination = destination
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var conn net.Conn
var err error
if h.transport != nil {
conn, err = h.transport.DialContext(ctx)
} else {
conn, err = h.dialer.DialContext(ctx, N.NetworkTCP, h.serverAddr)
if err == nil && h.tlsConfig != nil {
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conn, err = tls.ClientHandshake(ctx, conn, h.tlsConfig)
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}
}
if err != nil {
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common.Close(conn)
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return nil, err
}
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switch N.NetworkName(network) {
case N.NetworkTCP:
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return trojan.NewClientConn(conn, h.key, destination), nil
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case N.NetworkUDP:
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return bufio.NewBindPacketConn(trojan.NewClientPacketConn(conn, h.key), destination), nil
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default:
return nil, E.Extend(N.ErrUnknownNetwork, network)
}
}
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func (h *trojanDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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conn, err := h.DialContext(ctx, N.NetworkUDP, destination)
if err != nil {
return nil, err
}
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return conn.(net.PacketConn), nil
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}