sing-box/common/mux/router.go

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package mux
import (
"context"
"net"
"github.com/sagernet/sing-box/adapter"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing-mux"
E "github.com/sagernet/sing/common/exceptions"
"github.com/sagernet/sing/common/logger"
N "github.com/sagernet/sing/common/network"
)
type Router struct {
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router adapter.ConnectionRouterEx
service *mux.Service
}
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func NewRouterWithOptions(router adapter.ConnectionRouterEx, logger logger.ContextLogger, options option.InboundMultiplexOptions) (adapter.ConnectionRouterEx, error) {
if !options.Enabled {
return router, nil
}
var brutalOptions mux.BrutalOptions
if options.Brutal != nil && options.Brutal.Enabled {
brutalOptions = mux.BrutalOptions{
Enabled: true,
SendBPS: uint64(options.Brutal.UpMbps * C.MbpsToBps),
ReceiveBPS: uint64(options.Brutal.DownMbps * C.MbpsToBps),
}
if brutalOptions.SendBPS < mux.BrutalMinSpeedBPS {
return nil, E.New("brutal: invalid upload speed")
}
if brutalOptions.ReceiveBPS < mux.BrutalMinSpeedBPS {
return nil, E.New("brutal: invalid download speed")
}
}
service, err := mux.NewService(mux.ServiceOptions{
NewStreamContext: func(ctx context.Context, conn net.Conn) context.Context {
return log.ContextWithNewID(ctx)
},
Logger: logger,
Handler: adapter.NewRouteContextHandler(router, logger),
Padding: options.Padding,
Brutal: brutalOptions,
})
if err != nil {
return nil, err
}
return &Router{router, service}, nil
}
func (r *Router) RouteConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
if metadata.Destination == mux.Destination {
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// TODO: check if WithContext is necessary
return r.service.NewConnection(adapter.WithContext(ctx, &metadata), conn, adapter.UpstreamMetadata(metadata))
} else {
return r.router.RouteConnection(ctx, conn, metadata)
}
}
func (r *Router) RoutePacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
return r.router.RoutePacketConnection(ctx, conn, metadata)
}
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func (r *Router) RouteConnectionEx(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
if metadata.Destination == mux.Destination {
r.service.NewConnectionEx(adapter.WithContext(ctx, &metadata), conn, metadata.Source, metadata.Destination, onClose)
return
}
r.router.RouteConnectionEx(ctx, conn, metadata, onClose)
}
func (r *Router) RoutePacketConnectionEx(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
r.router.RoutePacketConnectionEx(ctx, conn, metadata, onClose)
}