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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-12-23 02:26:49 -05:00
v2fly/app/dispatcher/default.go
2018-03-15 10:32:10 +08:00

127 lines
3.5 KiB
Go

package dispatcher
//go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg impl -path App,Dispatcher,Default
import (
"context"
"time"
"v2ray.com/core"
"v2ray.com/core/app/proxyman"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/net"
"v2ray.com/core/proxy"
"v2ray.com/core/transport/ray"
)
var (
errSniffingTimeout = newError("timeout on sniffing")
)
// DefaultDispatcher is a default implementation of Dispatcher.
type DefaultDispatcher struct {
ohm core.OutboundHandlerManager
router core.Router
}
// NewDefaultDispatcher create a new DefaultDispatcher.
func NewDefaultDispatcher(ctx context.Context, config *Config) (*DefaultDispatcher, error) {
v := core.MustFromContext(ctx)
d := &DefaultDispatcher{
ohm: v.OutboundHandlerManager(),
router: v.Router(),
}
if err := v.RegisterFeature((*core.Dispatcher)(nil), d); err != nil {
return nil, newError("unable to register Dispatcher")
}
return d, nil
}
// Start implements app.Application.
func (*DefaultDispatcher) Start() error {
return nil
}
// Close implements app.Application.
func (*DefaultDispatcher) Close() error { return nil }
// Dispatch implements core.Dispatcher.
func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destination) (ray.InboundRay, error) {
if !destination.IsValid() {
panic("Dispatcher: Invalid destination.")
}
ctx = proxy.ContextWithTarget(ctx, destination)
outbound := ray.NewRay(ctx)
snifferList := proxyman.ProtocolSniffersFromContext(ctx)
if destination.Address.Family().IsDomain() || len(snifferList) == 0 {
go d.routedDispatch(ctx, outbound, destination)
} else {
go func() {
domain, err := sniffer(ctx, snifferList, outbound)
if err == nil {
newError("sniffed domain: ", domain).WithContext(ctx).WriteToLog()
destination.Address = net.ParseAddress(domain)
ctx = proxy.ContextWithTarget(ctx, destination)
}
d.routedDispatch(ctx, outbound, destination)
}()
}
return outbound, nil
}
func sniffer(ctx context.Context, snifferList []proxyman.KnownProtocols, outbound ray.OutboundRay) (string, error) {
payload := buf.New()
defer payload.Release()
sniffer := NewSniffer(snifferList)
totalAttempt := 0
for {
select {
case <-ctx.Done():
return "", ctx.Err()
default:
totalAttempt++
if totalAttempt > 5 {
return "", errSniffingTimeout
}
outbound.OutboundInput().Peek(payload)
if !payload.IsEmpty() {
domain, err := sniffer.Sniff(payload.Bytes())
if err != ErrMoreData {
return domain, err
}
}
if payload.IsFull() {
return "", ErrInvalidData
}
time.Sleep(time.Millisecond * 100)
}
}
}
func (d *DefaultDispatcher) routedDispatch(ctx context.Context, outbound ray.OutboundRay, destination net.Destination) {
dispatcher := d.ohm.GetDefaultHandler()
if d.router != nil {
if tag, err := d.router.PickRoute(ctx); err == nil {
if handler := d.ohm.GetHandler(tag); handler != nil {
newError("taking detour [", tag, "] for [", destination, "]").WithContext(ctx).WriteToLog()
dispatcher = handler
} else {
newError("non existing tag: ", tag).AtWarning().WithContext(ctx).WriteToLog()
}
} else {
newError("default route for ", destination).WithContext(ctx).WriteToLog()
}
}
dispatcher.Dispatch(ctx, outbound)
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewDefaultDispatcher(ctx, config.(*Config))
}))
}