Xray-core/app/dispatcher/default.go

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package dispatcher
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//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
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import (
"context"
"fmt"
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"strings"
"sync"
"time"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/log"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/dns"
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"github.com/xtls/xray-core/features/outbound"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/features/routing"
routing_session "github.com/xtls/xray-core/features/routing/session"
"github.com/xtls/xray-core/features/stats"
"github.com/xtls/xray-core/transport"
"github.com/xtls/xray-core/transport/pipe"
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)
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var errSniffingTimeout = newError("timeout on sniffing")
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type cachedReader struct {
sync.Mutex
reader *pipe.Reader
cache buf.MultiBuffer
}
func (r *cachedReader) Cache(b *buf.Buffer) {
mb, _ := r.reader.ReadMultiBufferTimeout(time.Millisecond * 100)
r.Lock()
if !mb.IsEmpty() {
r.cache, _ = buf.MergeMulti(r.cache, mb)
}
b.Clear()
rawBytes := b.Extend(buf.Size)
n := r.cache.Copy(rawBytes)
b.Resize(0, int32(n))
r.Unlock()
}
func (r *cachedReader) readInternal() buf.MultiBuffer {
r.Lock()
defer r.Unlock()
if r.cache != nil && !r.cache.IsEmpty() {
mb := r.cache
r.cache = nil
return mb
}
return nil
}
func (r *cachedReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
mb := r.readInternal()
if mb != nil {
return mb, nil
}
return r.reader.ReadMultiBuffer()
}
func (r *cachedReader) ReadMultiBufferTimeout(timeout time.Duration) (buf.MultiBuffer, error) {
mb := r.readInternal()
if mb != nil {
return mb, nil
}
return r.reader.ReadMultiBufferTimeout(timeout)
}
func (r *cachedReader) Interrupt() {
r.Lock()
if r.cache != nil {
r.cache = buf.ReleaseMulti(r.cache)
}
r.Unlock()
r.reader.Interrupt()
}
// DefaultDispatcher is a default implementation of Dispatcher.
type DefaultDispatcher struct {
ohm outbound.Manager
router routing.Router
policy policy.Manager
stats stats.Manager
dns dns.Client
fdns dns.FakeDNSEngine
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}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
d := new(DefaultDispatcher)
if err := core.RequireFeatures(ctx, func(om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dc dns.Client) error {
core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
d.fdns = fdns
})
return d.Init(config.(*Config), om, router, pm, sm, dc)
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}); err != nil {
return nil, err
}
return d, nil
}))
}
// Init initializes DefaultDispatcher.
func (d *DefaultDispatcher) Init(config *Config, om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dns dns.Client) error {
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d.ohm = om
d.router = router
d.policy = pm
d.stats = sm
d.dns = dns
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return nil
}
// Type implements common.HasType.
func (*DefaultDispatcher) Type() interface{} {
return routing.DispatcherType()
}
// Start implements common.Runnable.
func (*DefaultDispatcher) Start() error {
return nil
}
// Close implements common.Closable.
func (*DefaultDispatcher) Close() error { return nil }
func (d *DefaultDispatcher) getLink(ctx context.Context, network net.Network, sniffing session.SniffingRequest) (*transport.Link, *transport.Link) {
downOpt := pipe.OptionsFromContext(ctx)
upOpt := downOpt
if network == net.Network_UDP {
var ip2domain *sync.Map // net.IP.String() => domain, this map is used by server side when client turn on fakedns
// Client will send domain address in the buffer.UDP.Address, server record all possible target IP addrs.
// When target replies, server will restore the domain and send back to client.
// Note: this map is not global but per connection context
upOpt = append(upOpt, pipe.OnTransmission(func(mb buf.MultiBuffer) buf.MultiBuffer {
for i, buffer := range mb {
if buffer.UDP == nil {
continue
}
addr := buffer.UDP.Address
if addr.Family().IsIP() {
if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && fkr0.IsIPInIPPool(addr) && sniffing.Enabled {
domain := fkr0.GetDomainFromFakeDNS(addr)
if len(domain) > 0 {
buffer.UDP.Address = net.DomainAddress(domain)
newError("[fakedns client] override with domain: ", domain, " for xUDP buffer at ", i).WriteToLog(session.ExportIDToError(ctx))
} else {
newError("[fakedns client] failed to find domain! :", addr.String(), " for xUDP buffer at ", i).AtWarning().WriteToLog(session.ExportIDToError(ctx))
}
}
} else {
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if ip2domain == nil {
ip2domain = new(sync.Map)
newError("[fakedns client] create a new map").WriteToLog(session.ExportIDToError(ctx))
}
domain := addr.Domain()
ips, err := d.dns.LookupIP(domain, dns.IPOption{true, true, false})
if err == nil {
for _, ip := range ips {
ip2domain.Store(ip.String(), domain)
}
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newError("[fakedns client] candidate ip: "+fmt.Sprintf("%v", ips), " for xUDP buffer at ", i).WriteToLog(session.ExportIDToError(ctx))
} else {
newError("[fakedns client] failed to look up IP for ", domain, " for xUDP buffer at ", i).Base(err).WriteToLog(session.ExportIDToError(ctx))
}
}
}
return mb
}))
downOpt = append(downOpt, pipe.OnTransmission(func(mb buf.MultiBuffer) buf.MultiBuffer {
for i, buffer := range mb {
if buffer.UDP == nil {
continue
}
addr := buffer.UDP.Address
if addr.Family().IsIP() {
if ip2domain == nil {
continue
}
if domain, found := ip2domain.Load(addr.IP().String()); found {
buffer.UDP.Address = net.DomainAddress(domain.(string))
newError("[fakedns client] restore domain: ", domain.(string), " for xUDP buffer at ", i).WriteToLog(session.ExportIDToError(ctx))
}
} else {
if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok {
fakeIp := fkr0.GetFakeIPForDomain(addr.Domain())
buffer.UDP.Address = fakeIp[0]
newError("[fakedns client] restore FakeIP: ", buffer.UDP, fmt.Sprintf("%v", fakeIp), " for xUDP buffer at ", i).WriteToLog(session.ExportIDToError(ctx))
}
}
}
return mb
}))
}
uplinkReader, uplinkWriter := pipe.New(upOpt...)
downlinkReader, downlinkWriter := pipe.New(downOpt...)
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inboundLink := &transport.Link{
Reader: downlinkReader,
Writer: uplinkWriter,
}
outboundLink := &transport.Link{
Reader: uplinkReader,
Writer: downlinkWriter,
}
sessionInbound := session.InboundFromContext(ctx)
var user *protocol.MemoryUser
if sessionInbound != nil {
user = sessionInbound.User
}
if user != nil && len(user.Email) > 0 {
p := d.policy.ForLevel(user.Level)
if p.Stats.UserUplink {
name := "user>>>" + user.Email + ">>>traffic>>>uplink"
if c, _ := stats.GetOrRegisterCounter(d.stats, name); c != nil {
inboundLink.Writer = &SizeStatWriter{
Counter: c,
Writer: inboundLink.Writer,
}
}
}
if p.Stats.UserDownlink {
name := "user>>>" + user.Email + ">>>traffic>>>downlink"
if c, _ := stats.GetOrRegisterCounter(d.stats, name); c != nil {
outboundLink.Writer = &SizeStatWriter{
Counter: c,
Writer: outboundLink.Writer,
}
}
}
}
return inboundLink, outboundLink
}
func (d *DefaultDispatcher) shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
domain := result.Domain()
if domain == "" {
return false
}
for _, d := range request.ExcludeForDomain {
if strings.ToLower(domain) == d {
return false
}
}
protocolString := result.Protocol()
if resComp, ok := result.(SnifferResultComposite); ok {
protocolString = resComp.ProtocolForDomainResult()
}
for _, p := range request.OverrideDestinationForProtocol {
if strings.HasPrefix(protocolString, p) {
return true
}
if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && protocolString != "bittorrent" && p == "fakedns" &&
destination.Address.Family().IsIP() && fkr0.IsIPInIPPool(destination.Address) {
newError("Using sniffer ", protocolString, " since the fake DNS missed").WriteToLog(session.ExportIDToError(ctx))
return true
}
if resultSubset, ok := result.(SnifferIsProtoSubsetOf); ok {
if resultSubset.IsProtoSubsetOf(p) {
return true
}
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}
}
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return false
}
// Dispatch implements routing.Dispatcher.
func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destination) (*transport.Link, error) {
if !destination.IsValid() {
panic("Dispatcher: Invalid destination.")
}
ob := &session.Outbound{
Target: destination,
}
ctx = session.ContextWithOutbound(ctx, ob)
content := session.ContentFromContext(ctx)
if content == nil {
content = new(session.Content)
ctx = session.ContextWithContent(ctx, content)
}
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sniffingRequest := content.SniffingRequest
inbound, outbound := d.getLink(ctx, destination.Network, sniffingRequest)
if !sniffingRequest.Enabled {
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go d.routedDispatch(ctx, outbound, destination)
} else {
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go func() {
cReader := &cachedReader{
reader: outbound.Reader.(*pipe.Reader),
}
outbound.Reader = cReader
result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)
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if err == nil {
content.Protocol = result.Protocol()
}
if err == nil && d.shouldOverride(ctx, result, sniffingRequest, destination) {
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domain := result.Domain()
newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
destination.Address = net.ParseAddress(domain)
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if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
ob.RouteTarget = destination
} else {
ob.Target = destination
}
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}
d.routedDispatch(ctx, outbound, destination)
}()
}
return inbound, nil
}
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// DispatchLink implements routing.Dispatcher.
func (d *DefaultDispatcher) DispatchLink(ctx context.Context, destination net.Destination, outbound *transport.Link) error {
if !destination.IsValid() {
return newError("Dispatcher: Invalid destination.")
}
ob := &session.Outbound{
Target: destination,
}
ctx = session.ContextWithOutbound(ctx, ob)
content := session.ContentFromContext(ctx)
if content == nil {
content = new(session.Content)
ctx = session.ContextWithContent(ctx, content)
}
sniffingRequest := content.SniffingRequest
if !sniffingRequest.Enabled {
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go d.routedDispatch(ctx, outbound, destination)
} else {
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go func() {
cReader := &cachedReader{
reader: outbound.Reader.(*pipe.Reader),
}
outbound.Reader = cReader
result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)
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if err == nil {
content.Protocol = result.Protocol()
}
if err == nil && d.shouldOverride(ctx, result, sniffingRequest, destination) {
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domain := result.Domain()
newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
destination.Address = net.ParseAddress(domain)
if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
ob.RouteTarget = destination
} else {
ob.Target = destination
}
}
d.routedDispatch(ctx, outbound, destination)
}()
}
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return nil
}
func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool, network net.Network) (SniffResult, error) {
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payload := buf.New()
defer payload.Release()
sniffer := NewSniffer(ctx)
metaresult, metadataErr := sniffer.SniffMetadata(ctx)
if metadataOnly {
return metaresult, metadataErr
}
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contentResult, contentErr := func() (SniffResult, error) {
totalAttempt := 0
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
totalAttempt++
if totalAttempt > 2 {
return nil, errSniffingTimeout
}
cReader.Cache(payload)
if !payload.IsEmpty() {
result, err := sniffer.Sniff(ctx, payload.Bytes(), network)
if err != common.ErrNoClue {
return result, err
}
}
if payload.IsFull() {
return nil, errUnknownContent
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}
}
}
}()
if contentErr != nil && metadataErr == nil {
return metaresult, nil
}
if contentErr == nil && metadataErr == nil {
return CompositeResult(metaresult, contentResult), nil
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}
return contentResult, contentErr
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}
func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {
ob := session.OutboundFromContext(ctx)
if hosts, ok := d.dns.(dns.HostsLookup); ok && destination.Address.Family().IsDomain() {
proxied := hosts.LookupHosts(ob.Target.String())
if proxied != nil {
ro := ob.RouteTarget == destination
destination.Address = *proxied
if ro {
ob.RouteTarget = destination
} else {
ob.Target = destination
}
}
}
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var handler outbound.Handler
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routingLink := routing_session.AsRoutingContext(ctx)
inTag := routingLink.GetInboundTag()
isPickRoute := 0
if forcedOutboundTag := session.GetForcedOutboundTagFromContext(ctx); forcedOutboundTag != "" {
ctx = session.SetForcedOutboundTagToContext(ctx, "")
if h := d.ohm.GetHandler(forcedOutboundTag); h != nil {
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isPickRoute = 1
newError("taking platform initialized detour [", forcedOutboundTag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
handler = h
} else {
newError("non existing tag for platform initialized detour: ", forcedOutboundTag).AtError().WriteToLog(session.ExportIDToError(ctx))
common.Close(link.Writer)
common.Interrupt(link.Reader)
return
}
} else if d.router != nil {
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if route, err := d.router.PickRoute(routingLink); err == nil {
outTag := route.GetOutboundTag()
if h := d.ohm.GetHandler(outTag); h != nil {
isPickRoute = 2
newError("taking detour [", outTag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
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handler = h
} else {
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newError("non existing outTag: ", outTag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
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}
} else {
newError("default route for ", destination).WriteToLog(session.ExportIDToError(ctx))
}
}
if handler == nil {
handler = d.ohm.GetDefaultHandler()
}
if handler == nil {
newError("default outbound handler not exist").WriteToLog(session.ExportIDToError(ctx))
common.Close(link.Writer)
common.Interrupt(link.Reader)
return
}
if accessMessage := log.AccessMessageFromContext(ctx); accessMessage != nil {
if tag := handler.Tag(); tag != "" {
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if inTag == "" {
accessMessage.Detour = tag
} else if isPickRoute == 1 {
accessMessage.Detour = inTag + " ==> " + tag
} else if isPickRoute == 2 {
accessMessage.Detour = inTag + " -> " + tag
} else {
accessMessage.Detour = inTag + " >> " + tag
}
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}
log.Record(accessMessage)
}
handler.Dispatch(ctx, link)
}