Xray-core/app/dispatcher/sniffer.go
yuhan6665 079d0bd8a9
Refactor log (#3446)
* Refactor log

* Add new log methods

* Fix logger test

* Change all logging code

* Clean up pathObj

* Rebase to latest main

* Remove invoking method name after the dot
2024-06-29 14:32:57 -04:00

139 lines
3.8 KiB
Go

package dispatcher
import (
"context"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol/bittorrent"
"github.com/xtls/xray-core/common/protocol/http"
"github.com/xtls/xray-core/common/protocol/quic"
"github.com/xtls/xray-core/common/protocol/tls"
)
type SniffResult interface {
Protocol() string
Domain() string
}
type protocolSniffer func(context.Context, []byte) (SniffResult, error)
type protocolSnifferWithMetadata struct {
protocolSniffer protocolSniffer
// A Metadata sniffer will be invoked on connection establishment only, with nil body,
// for both TCP and UDP connections
// It will not be shown as a traffic type for routing unless there is no other successful sniffing.
metadataSniffer bool
network net.Network
}
type Sniffer struct {
sniffer []protocolSnifferWithMetadata
}
func NewSniffer(ctx context.Context) *Sniffer {
ret := &Sniffer{
sniffer: []protocolSnifferWithMetadata{
{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false, net.Network_TCP},
{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false, net.Network_TCP},
{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false, net.Network_TCP},
{func(c context.Context, b []byte) (SniffResult, error) { return quic.SniffQUIC(b) }, false, net.Network_UDP},
{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffUTP(b) }, false, net.Network_UDP},
},
}
if sniffer, err := newFakeDNSSniffer(ctx); err == nil {
others := ret.sniffer
ret.sniffer = append(ret.sniffer, sniffer)
fakeDNSThenOthers, err := newFakeDNSThenOthers(ctx, sniffer, others)
if err == nil {
ret.sniffer = append([]protocolSnifferWithMetadata{fakeDNSThenOthers}, ret.sniffer...)
}
}
return ret
}
var errUnknownContent = errors.New("unknown content")
func (s *Sniffer) Sniff(c context.Context, payload []byte, network net.Network) (SniffResult, error) {
var pendingSniffer []protocolSnifferWithMetadata
for _, si := range s.sniffer {
s := si.protocolSniffer
if si.metadataSniffer || si.network != network {
continue
}
result, err := s(c, payload)
if err == common.ErrNoClue {
pendingSniffer = append(pendingSniffer, si)
continue
}
if err == nil && result != nil {
return result, nil
}
}
if len(pendingSniffer) > 0 {
s.sniffer = pendingSniffer
return nil, common.ErrNoClue
}
return nil, errUnknownContent
}
func (s *Sniffer) SniffMetadata(c context.Context) (SniffResult, error) {
var pendingSniffer []protocolSnifferWithMetadata
for _, si := range s.sniffer {
s := si.protocolSniffer
if !si.metadataSniffer {
pendingSniffer = append(pendingSniffer, si)
continue
}
result, err := s(c, nil)
if err == common.ErrNoClue {
pendingSniffer = append(pendingSniffer, si)
continue
}
if err == nil && result != nil {
return result, nil
}
}
if len(pendingSniffer) > 0 {
s.sniffer = pendingSniffer
return nil, common.ErrNoClue
}
return nil, errUnknownContent
}
func CompositeResult(domainResult SniffResult, protocolResult SniffResult) SniffResult {
return &compositeResult{domainResult: domainResult, protocolResult: protocolResult}
}
type compositeResult struct {
domainResult SniffResult
protocolResult SniffResult
}
func (c compositeResult) Protocol() string {
return c.protocolResult.Protocol()
}
func (c compositeResult) Domain() string {
return c.domainResult.Domain()
}
func (c compositeResult) ProtocolForDomainResult() string {
return c.domainResult.Protocol()
}
type SnifferResultComposite interface {
ProtocolForDomainResult() string
}
type SnifferIsProtoSubsetOf interface {
IsProtoSubsetOf(protocolName string) bool
}