mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-09-06 20:14:31 -04:00
169 lines
4.5 KiB
Go
169 lines
4.5 KiB
Go
package dispatcher
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//go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg impl -path App,Dispatcher,Default
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import (
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"context"
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"time"
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"v2ray.com/core"
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"v2ray.com/core/app/proxyman"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/proxy"
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"v2ray.com/core/transport/ray"
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)
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var (
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errSniffingTimeout = newError("timeout on sniffing")
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)
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// DefaultDispatcher is a default implementation of Dispatcher.
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type DefaultDispatcher struct {
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ohm core.OutboundHandlerManager
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router core.Router
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policy core.PolicyManager
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stats core.StatManager
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}
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// NewDefaultDispatcher create a new DefaultDispatcher.
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func NewDefaultDispatcher(ctx context.Context, config *Config) (*DefaultDispatcher, error) {
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v := core.MustFromContext(ctx)
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d := &DefaultDispatcher{
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ohm: v.OutboundHandlerManager(),
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router: v.Router(),
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policy: v.PolicyManager(),
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stats: v.Stats(),
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}
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if err := v.RegisterFeature((*core.Dispatcher)(nil), d); err != nil {
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return nil, newError("unable to register Dispatcher")
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}
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return d, nil
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}
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// Start implements common.Runnable.
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func (*DefaultDispatcher) Start() error {
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return nil
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}
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// Close implements common.Closable.
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func (*DefaultDispatcher) Close() error { return nil }
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func (d *DefaultDispatcher) getStatCounter(name string) core.StatCounter {
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c := d.stats.GetCounter(name)
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if c != nil {
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return c
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}
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c, err := d.stats.RegisterCounter(name)
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if err != nil {
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return nil
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}
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return c
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}
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func (d *DefaultDispatcher) getRayOption(user *protocol.User) []ray.Option {
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var rayOptions []ray.Option
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if user != nil && len(user.Email) > 0 {
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p := d.policy.ForLevel(user.Level)
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if p.Stats.UserUplink {
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name := "user>>>" + user.Email + ">>>traffic>>>uplink"
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if c := d.getStatCounter(name); c != nil {
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rayOptions = append(rayOptions, ray.WithUplinkStatCounter(c))
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}
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}
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if p.Stats.UserDownlink {
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name := "user>>>" + user.Email + ">>>traffic>>>downlink"
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if c := d.getStatCounter(name); c != nil {
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rayOptions = append(rayOptions, ray.WithDownlinkStatCounter(c))
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}
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}
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}
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return rayOptions
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}
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// Dispatch implements core.Dispatcher.
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func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destination) (ray.InboundRay, error) {
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if !destination.IsValid() {
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panic("Dispatcher: Invalid destination.")
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}
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ctx = proxy.ContextWithTarget(ctx, destination)
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user := protocol.UserFromContext(ctx)
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rayOptions := d.getRayOption(user)
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outbound := ray.New(ctx, rayOptions...)
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snifferList := proxyman.ProtocolSniffersFromContext(ctx)
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if destination.Address.Family().IsDomain() || len(snifferList) == 0 {
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go d.routedDispatch(ctx, outbound, destination)
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} else {
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go func() {
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domain, err := sniffer(ctx, snifferList, outbound)
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if err == nil {
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newError("sniffed domain: ", domain).WithContext(ctx).WriteToLog()
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destination.Address = net.ParseAddress(domain)
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ctx = proxy.ContextWithTarget(ctx, destination)
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}
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d.routedDispatch(ctx, outbound, destination)
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}()
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}
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return outbound, nil
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}
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func sniffer(ctx context.Context, snifferList []proxyman.KnownProtocols, outbound ray.OutboundRay) (string, error) {
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payload := buf.New()
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defer payload.Release()
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sniffer := NewSniffer(snifferList)
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totalAttempt := 0
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for {
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select {
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case <-ctx.Done():
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return "", ctx.Err()
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default:
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totalAttempt++
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if totalAttempt > 5 {
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return "", errSniffingTimeout
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}
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outbound.OutboundInput().Peek(payload)
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if !payload.IsEmpty() {
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domain, err := sniffer.Sniff(payload.Bytes())
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if err != ErrMoreData {
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return domain, err
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}
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}
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if payload.IsFull() {
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return "", ErrInvalidData
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}
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time.Sleep(time.Millisecond * 100)
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}
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}
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}
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func (d *DefaultDispatcher) routedDispatch(ctx context.Context, outbound ray.OutboundRay, destination net.Destination) {
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dispatcher := d.ohm.GetDefaultHandler()
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if d.router != nil {
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if tag, err := d.router.PickRoute(ctx); err == nil {
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if handler := d.ohm.GetHandler(tag); handler != nil {
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newError("taking detour [", tag, "] for [", destination, "]").WithContext(ctx).WriteToLog()
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dispatcher = handler
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} else {
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newError("non existing tag: ", tag).AtWarning().WithContext(ctx).WriteToLog()
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}
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} else {
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newError("default route for ", destination).WithContext(ctx).WriteToLog()
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}
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}
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dispatcher.Dispatch(ctx, outbound)
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}
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func init() {
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common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return NewDefaultDispatcher(ctx, config.(*Config))
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}))
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}
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