sing-box/protocol/shadowsocks/outbound.go

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package shadowsocks
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import (
"context"
"net"
"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/adapter/outbound"
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"github.com/sagernet/sing-box/common/dialer"
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"github.com/sagernet/sing-box/common/mux"
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C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing-box/transport/sip003"
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"github.com/sagernet/sing-shadowsocks2"
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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"
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"github.com/sagernet/sing/common/logger"
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M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
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"github.com/sagernet/sing/common/uot"
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)
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func RegisterOutbound(registry *outbound.Registry) {
outbound.Register[option.ShadowsocksOutboundOptions](registry, C.TypeShadowsocks, NewOutbound)
}
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type Outbound struct {
outbound.Adapter
logger logger.ContextLogger
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dialer N.Dialer
method shadowsocks.Method
serverAddr M.Socksaddr
plugin sip003.Plugin
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uotClient *uot.Client
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multiplexDialer *mux.Client
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}
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func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.ShadowsocksOutboundOptions) (adapter.Outbound, error) {
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method, err := shadowsocks.CreateMethod(ctx, options.Method, shadowsocks.MethodOptions{
Password: options.Password,
})
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if err != nil {
return nil, err
}
outboundDialer, err := dialer.New(ctx, options.DialerOptions)
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if err != nil {
return nil, err
}
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outbound := &Outbound{
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Adapter: outbound.NewAdapterWithDialerOptions(C.TypeShadowsocks, tag, options.Network.Build(), options.DialerOptions),
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logger: logger,
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dialer: outboundDialer,
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method: method,
serverAddr: options.ServerOptions.Build(),
}
if options.Plugin != "" {
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outbound.plugin, err = sip003.CreatePlugin(ctx, options.Plugin, options.PluginOptions, router, outbound.dialer, outbound.serverAddr)
if err != nil {
return nil, err
}
}
uotOptions := common.PtrValueOrDefault(options.UDPOverTCP)
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if !uotOptions.Enabled {
outbound.multiplexDialer, err = mux.NewClientWithOptions((*shadowsocksDialer)(outbound), logger, common.PtrValueOrDefault(options.Multiplex))
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if err != nil {
return nil, err
}
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}
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if uotOptions.Enabled {
outbound.uotClient = &uot.Client{
Dialer: (*shadowsocksDialer)(outbound),
Version: uotOptions.Version,
}
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}
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return outbound, nil
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}
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func (h *Outbound) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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ctx, metadata := adapter.ExtendContext(ctx)
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metadata.Outbound = h.Tag()
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metadata.Destination = destination
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if h.multiplexDialer == nil {
switch N.NetworkName(network) {
case N.NetworkTCP:
h.logger.InfoContext(ctx, "outbound connection to ", destination)
case N.NetworkUDP:
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if h.uotClient != nil {
h.logger.InfoContext(ctx, "outbound UoT connect packet connection to ", destination)
return h.uotClient.DialContext(ctx, network, destination)
} else {
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
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}
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}
return (*shadowsocksDialer)(h).DialContext(ctx, network, destination)
} 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)
}
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}
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func (h *Outbound) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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ctx, metadata := adapter.ExtendContext(ctx)
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metadata.Outbound = h.Tag()
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metadata.Destination = destination
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if h.multiplexDialer == nil {
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if h.uotClient != nil {
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h.logger.InfoContext(ctx, "outbound UoT packet connection to ", destination)
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return h.uotClient.ListenPacket(ctx, destination)
} else {
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
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}
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h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
return (*shadowsocksDialer)(h).ListenPacket(ctx, destination)
} else {
h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
return h.multiplexDialer.ListenPacket(ctx, destination)
}
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}
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func (h *Outbound) InterfaceUpdated() {
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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 *Outbound) Close() error {
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return common.Close(common.PtrOrNil(h.multiplexDialer))
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}
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var _ N.Dialer = (*shadowsocksDialer)(nil)
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type shadowsocksDialer Outbound
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func (h *shadowsocksDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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ctx, metadata := adapter.ExtendContext(ctx)
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metadata.Outbound = h.Tag()
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metadata.Destination = destination
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switch N.NetworkName(network) {
case N.NetworkTCP:
var outConn net.Conn
var err error
if h.plugin != nil {
outConn, err = h.plugin.DialContext(ctx)
} else {
outConn, err = h.dialer.DialContext(ctx, N.NetworkTCP, h.serverAddr)
}
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if err != nil {
return nil, err
}
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return h.method.DialEarlyConn(outConn, destination), nil
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case N.NetworkUDP:
outConn, err := h.dialer.DialContext(ctx, N.NetworkUDP, h.serverAddr)
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if err != nil {
return nil, err
}
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return bufio.NewBindPacketConn(h.method.DialPacketConn(outConn), destination), nil
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default:
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return nil, E.Extend(N.ErrUnknownNetwork, network)
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}
}
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func (h *shadowsocksDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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ctx, metadata := adapter.ExtendContext(ctx)
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metadata.Outbound = h.Tag()
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metadata.Destination = destination
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outConn, err := h.dialer.DialContext(ctx, N.NetworkUDP, h.serverAddr)
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if err != nil {
return nil, err
}
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return h.method.DialPacketConn(outConn), nil
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}