Update version 1.5.9

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.47.0 to 1.48.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.47.0...v1.48.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/dependabot.yml

@@ -9,3 +9,7 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/release.yml

@@ -21,6 +21,8 @@ on:
       - ".github/workflows/*.yml"
 jobs:
   build:
+    permissions:
+      contents: write
     strategy:
       matrix:
         # Include amd64 on all platforms.
@@ -110,7 +112,7 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Show workflow information 
         id: get_filename
@@ -121,9 +123,10 @@ jobs:
           echo "ASSET_NAME=$_NAME" >> $GITHUB_ENV
 
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v3
         with:
-          go-version: ^1.17.2
+          go-version: 1.18
+          check-latest: true
 
       - name: Get project dependencies
         run: go mod download
@@ -142,6 +145,11 @@ jobs:
         run: |
           mkdir -p build_assets
           go build -v -o build_assets/xray -trimpath -ldflags "-s -w -buildid=" ./main
+
+      - name: Build background Xray on Windows 
+        if: matrix.goos == 'windows'
+        run: |
+          go build -v -o build_assets/wxray.exe -trimpath -ldflags "-s -w -H windowsgui -buildid=" ./main
     
       - name: Build Mips softfloat Xray
         if: matrix.goarch == 'mips' || matrix.goarch == 'mipsle'
@@ -190,7 +198,7 @@ jobs:
           mv build_assets Xray-$ASSET_NAME
 
       - name: Upload files to Artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: Xray-${{ steps.get_filename.outputs.ASSET_NAME }}
           path: |

.github/workflows/test.yml

@@ -19,6 +19,8 @@ on:
 
 jobs:
   test:
+    permissions:
+      contents: read
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -26,11 +28,12 @@ jobs:
         os: [windows-latest, ubuntu-latest, macos-latest]
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v3
         with:
-          go-version: ^1.17.2
+          go-version: 1.18
+          check-latest: true
       - name: Checkout codebase
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Prepare geo*dat
         if: ${{ matrix.os != 'windows-latest' }}

.gitignore

@@ -0,0 +1,28 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+*.DS_Store
+.idea
+*.zip
+*.tar.gz
+xray
+mockgen
+vprotogen
+!infra/vprotogen/
+errorgen
+!common/errors/errorgen/
+*.dat
+.vscode

CODE_OF_CONDUCT.md

@@ -0,0 +1,128 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+https://t.me/projectXtls.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at
+https://www.contributor-covenant.org/translations.

README.md

@@ -1,6 +1,6 @@
 # Project X
 
-[Project X](https://github.com/XTLS) originates from XTLS protocol, provides a set of network tools such as [Xray-core](https://github.com/XTLS/Xray-core) and [Xray-flutter](https://github.com/XTLS/Xray-flutter).
+[Project X](https://github.com/XTLS) originates from XTLS protocol, provides a set of network tools such as [Xray-core](https://github.com/XTLS/Xray-core).
 
 ## License
 
@@ -13,7 +13,6 @@
   - [Xray-script](https://github.com/kirin10000/Xray-script)
 - Docker
   - [teddysun/xray](https://hub.docker.com/r/teddysun/xray)
-  - Xray-docker
 - One Click
   - [ProxySU](https://github.com/proxysu/ProxySU)
   - [v2ray-agent](https://github.com/mack-a/v2ray-agent)
@@ -27,6 +26,9 @@
   - [(Tap) Repository 0](https://github.com/N4FA/homebrew-xray)
   - [(Tap) Repository 1](https://github.com/xiruizhao/homebrew-xray)
 
+## Contributing
+[Code Of Conduct](https://github.com/XTLS/Xray-core/blob/main/CODE_OF_CONDUCT.md)
+
 ## Usage
 
 [Xray-examples](https://github.com/XTLS/Xray-examples) / [VLESS-TCP-XTLS-WHATEVER](https://github.com/XTLS/Xray-examples/tree/main/VLESS-TCP-XTLS-WHATEVER)
@@ -40,16 +42,17 @@
   - [luci-app-xray](https://github.com/yichya/luci-app-xray) ([openwrt-xray](https://github.com/yichya/openwrt-xray))
 - Windows
   - [v2rayN](https://github.com/2dust/v2rayN)
-  - [Qv2ray](https://github.com/Qv2ray/Qv2ray)  (This project had been archived and currently inactive)
+  - [Qv2ray](https://github.com/Qv2ray/Qv2ray) (This project had been archived and currently inactive)
-  - [Netch (NetFilter & TUN/TAP)](https://github.com/NetchX/Netch)
+  - [Netch (NetFilter & TUN/TAP)](https://github.com/NetchX/Netch) (This project had been archived and currently inactive)
 - Android
   - [v2rayNG](https://github.com/2dust/v2rayNG)
-  - [AnXray](https://github.com/XTLS/AnXray)
   - [Kitsunebi](https://github.com/rurirei/Kitsunebi/tree/release_xtls)
 - iOS & macOS (with M1 chip)
   - [Shadowrocket](https://apps.apple.com/app/shadowrocket/id932747118)
+  - [Stash](https://apps.apple.com/app/stash/id1596063349)
 - macOS (Intel chip & M1 chip)
   - [Qv2ray](https://github.com/Qv2ray/Qv2ray) (This project had been archived and currently inactive)
+  - [V2RayXS](https://github.com/tzmax/V2RayXS)
 
 ## Credits
 
@@ -58,26 +61,30 @@ This repo relies on the following third-party projects:
 - Special thanks:
   - [v2fly/v2ray-core](https://github.com/v2fly/v2ray-core)
 - In production:
+  - [ghodss/yaml](https://github.com/ghodss/yaml)
   - [gorilla/websocket](https://github.com/gorilla/websocket)
   - [lucas-clemente/quic-go](https://github.com/lucas-clemente/quic-go)
+  - [pelletier/go-toml](https://github.com/pelletier/go-toml)
   - [pires/go-proxyproto](https://github.com/pires/go-proxyproto)
+  - [refraction-networking/utls](https://github.com/refraction-networking/utls)
   - [seiflotfy/cuckoofilter](https://github.com/seiflotfy/cuckoofilter)
   - [google/starlark-go](https://github.com/google/starlark-go)
 - For testing only:
   - [miekg/dns](https://github.com/miekg/dns)
+  - [stretchr/testify](https://github.com/stretchr/testify)
   - [h12w/socks](https://github.com/h12w/socks)
 
 ## Compilation
 
 ### Windows
 
-```
+```bash
 go build -o xray.exe -trimpath -ldflags "-s -w -buildid=" ./main
 ```
 
 ### Linux / macOS
 
-```
+```bash
 go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
 ```
 

app/commander/commander.go

@@ -7,12 +7,11 @@ import (
 	"net"
 	"sync"
 
-	"google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/signal/done"
 	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/outbound"
+	"google.golang.org/grpc"
 )
 
 // Commander is a Xray feature that provides gRPC methods to external clients.

app/commander/outbound.go

@@ -37,7 +37,7 @@ func (l *OutboundListener) Accept() (net.Conn, error) {
 	}
 }
 
-// Close implement net.Listener.
+// Close implements net.Listener.
 func (l *OutboundListener) Close() error {
 	common.Must(l.done.Close())
 L:

app/commander/service.go

@@ -3,10 +3,9 @@ package commander
 import (
 	"context"
 
+	"github.com/xtls/xray-core/common"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/reflection"
-
-	"github.com/xtls/xray-core/common"
 )
 
 // Service is a Commander service.

app/dispatcher/default.go

@@ -4,6 +4,7 @@ package dispatcher
 
 import (
 	"context"
+	"fmt"
 	"strings"
 	"sync"
 	"time"
@@ -92,13 +93,18 @@ type DefaultDispatcher struct {
 	router routing.Router
 	policy policy.Manager
 	stats  stats.Manager
+	dns    dns.Client
+	fdns   dns.FakeDNSEngine
 }
 
 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) error {
+		if err := core.RequireFeatures(ctx, func(om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dc dns.Client) error {
-			return d.Init(config.(*Config), om, router, pm, sm)
+			core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
+				d.fdns = fdns
+			})
+			return d.Init(config.(*Config), om, router, pm, sm, dc)
 		}); err != nil {
 			return nil, err
 		}
@@ -107,11 +113,12 @@ func init() {
 }
 
 // Init initializes DefaultDispatcher.
-func (d *DefaultDispatcher) Init(config *Config, om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager) error {
+func (d *DefaultDispatcher) Init(config *Config, om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dns dns.Client) error {
 	d.ohm = om
 	d.router = router
 	d.policy = pm
 	d.stats = sm
+	d.dns = dns
 	return nil
 }
 
@@ -128,10 +135,77 @@ func (*DefaultDispatcher) Start() error {
 // Close implements common.Closable.
 func (*DefaultDispatcher) Close() error { return nil }
 
-func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *transport.Link) {
+func (d *DefaultDispatcher) getLink(ctx context.Context, network net.Network, sniffing session.SniffingRequest) (*transport.Link, *transport.Link) {
-	opt := pipe.OptionsFromContext(ctx)
+	downOpt := pipe.OptionsFromContext(ctx)
-	uplinkReader, uplinkWriter := pipe.New(opt...)
+	upOpt := downOpt
-	downlinkReader, downlinkWriter := pipe.New(opt...)
+
+	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 {
+					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)
+						}
+						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...)
 
 	inboundLink := &transport.Link{
 		Reader: downlinkReader,
@@ -174,17 +248,16 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 	return inboundLink, outboundLink
 }
 
-func shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
+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
 		}
 	}
-	var fakeDNSEngine dns.FakeDNSEngine
-	core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
-		fakeDNSEngine = fdns
-	})
 	protocolString := result.Protocol()
 	if resComp, ok := result.(SnifferResultComposite); ok {
 		protocolString = resComp.ProtocolForDomainResult()
@@ -193,10 +266,10 @@ func shouldOverride(ctx context.Context, result SniffResult, request session.Sni
 		if strings.HasPrefix(protocolString, p) {
 			return true
 		}
-		if fkr0, ok := fakeDNSEngine.(dns.FakeDNSEngineRev0); ok && protocolString != "bittorrent" && p == "fakedns" &&
+		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))
+			newError("Using sniffer ", protocolString, " since the fake DNS missed").WriteToLog(session.ExportIDToError(ctx))
-				return true
+			return true
 		}
 		if resultSubset, ok := result.(SnifferIsProtoSubsetOf); ok {
 			if resultSubset.IsProtoSubsetOf(p) {
@@ -217,45 +290,35 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 		Target: destination,
 	}
 	ctx = session.ContextWithOutbound(ctx, ob)
-
-	inbound, outbound := d.getLink(ctx)
 	content := session.ContentFromContext(ctx)
 	if content == nil {
 		content = new(session.Content)
 		ctx = session.ContextWithContent(ctx, content)
 	}
+
 	sniffingRequest := content.SniffingRequest
-	switch {
+	inbound, outbound := d.getLink(ctx, destination.Network, sniffingRequest)
-	case !sniffingRequest.Enabled:
+	if !sniffingRequest.Enabled {
 		go d.routedDispatch(ctx, outbound, destination)
-	case destination.Network != net.Network_TCP:
+	} else {
-		// Only metadata sniff will be used for non tcp connection
-		result, err := sniffer(ctx, nil, true)
-		if err == nil {
-			content.Protocol = result.Protocol()
-			if shouldOverride(ctx, result, sniffingRequest, destination) {
-				domain := result.Domain()
-				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
-				destination.Address = net.ParseAddress(domain)
-				ob.Target = destination
-			}
-		}
-		go d.routedDispatch(ctx, outbound, destination)
-	default:
 		go func() {
 			cReader := &cachedReader{
 				reader: outbound.Reader.(*pipe.Reader),
 			}
 			outbound.Reader = cReader
-			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
+			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)
 			if err == nil {
 				content.Protocol = result.Protocol()
 			}
-			if err == nil && shouldOverride(ctx, result, sniffingRequest, destination) {
+			if err == nil && d.shouldOverride(ctx, result, sniffingRequest, destination) {
 				domain := result.Domain()
 				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
 				destination.Address = net.ParseAddress(domain)
-				ob.Target = destination
+				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
+					ob.RouteTarget = destination
+				} else {
+					ob.Target = destination
+				}
 			}
 			d.routedDispatch(ctx, outbound, destination)
 		}()
@@ -263,7 +326,51 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 	return inbound, nil
 }
 
-func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (SniffResult, error) {
+// 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 {
+		go d.routedDispatch(ctx, outbound, destination)
+	} else {
+		go func() {
+			cReader := &cachedReader{
+				reader: outbound.Reader.(*pipe.Reader),
+			}
+			outbound.Reader = cReader
+			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)
+			if err == nil {
+				content.Protocol = result.Protocol()
+			}
+			if err == nil && d.shouldOverride(ctx, result, sniffingRequest, destination) {
+				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)
+		}()
+	}
+
+	return nil
+}
+
+func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool, network net.Network) (SniffResult, error) {
 	payload := buf.New()
 	defer payload.Release()
 
@@ -289,7 +396,7 @@ func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (Sni
 
 				cReader.Cache(payload)
 				if !payload.IsEmpty() {
-					result, err := sniffer.Sniff(ctx, payload.Bytes())
+					result, err := sniffer.Sniff(ctx, payload.Bytes(), network)
 					if err != common.ErrNoClue {
 						return result, err
 					}
@@ -310,16 +417,46 @@ func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (Sni
 }
 
 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
+			}
+		}
+	}
+
 	var handler outbound.Handler
 
-	if d.router != nil {
+	routingLink := routing_session.AsRoutingContext(ctx)
-		if route, err := d.router.PickRoute(routing_session.AsRoutingContext(ctx)); err == nil {
+	inTag := routingLink.GetInboundTag()
-			tag := route.GetOutboundTag()
+	isPickRoute := 0
-			if h := d.ohm.GetHandler(tag); h != nil {
+	if forcedOutboundTag := session.GetForcedOutboundTagFromContext(ctx); forcedOutboundTag != "" {
-				newError("taking detour [", tag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
+		ctx = session.SetForcedOutboundTagToContext(ctx, "")
+		if h := d.ohm.GetHandler(forcedOutboundTag); h != nil {
+			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 {
+		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))
 				handler = h
 			} else {
-				newError("non existing outTag: ", tag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
+				newError("non existing outTag: ", outTag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 			}
 		} else {
 			newError("default route for ", destination).WriteToLog(session.ExportIDToError(ctx))
@@ -339,7 +476,15 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.
 
 	if accessMessage := log.AccessMessageFromContext(ctx); accessMessage != nil {
 		if tag := handler.Tag(); tag != "" {
-			accessMessage.Detour = tag
+			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
+			}
 		}
 		log.Record(accessMessage)
 	}

app/dispatcher/fakednssniffer.go

@@ -11,15 +11,16 @@ import (
 	"github.com/xtls/xray-core/features/dns"
 )
 
-// newFakeDNSSniffer Create a Fake DNS metadata sniffer
+// newFakeDNSSniffer Creates a Fake DNS metadata sniffer
 func newFakeDNSSniffer(ctx context.Context) (protocolSnifferWithMetadata, error) {
 	var fakeDNSEngine dns.FakeDNSEngine
-	err := core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
+	{
-		fakeDNSEngine = fdns
+		fakeDNSEngineFeat := core.MustFromContext(ctx).GetFeature((*dns.FakeDNSEngine)(nil))
-	})
+		if fakeDNSEngineFeat != nil {
-	if err != nil {
+			fakeDNSEngine = fakeDNSEngineFeat.(dns.FakeDNSEngine)
-		return protocolSnifferWithMetadata{}, err
+		}
 	}
+
 	if fakeDNSEngine == nil {
 		errNotInit := newError("FakeDNSEngine is not initialized, but such a sniffer is used").AtError()
 		return protocolSnifferWithMetadata{}, errNotInit
@@ -84,7 +85,8 @@ func (f DNSThenOthersSniffResult) Domain() string {
 }
 
 func newFakeDNSThenOthers(ctx context.Context, fakeDNSSniffer protocolSnifferWithMetadata, others []protocolSnifferWithMetadata) (
-	protocolSnifferWithMetadata, error) { // nolint: unparam
+	protocolSnifferWithMetadata, error,
+) { // nolint: unparam
 	// ctx may be used in the future
 	_ = ctx
 	return protocolSnifferWithMetadata{

app/dispatcher/sniffer.go

@@ -4,8 +4,10 @@ import (
 	"context"
 
 	"github.com/xtls/xray-core/common"
+	"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"
 )
 
@@ -22,6 +24,7 @@ type protocolSnifferWithMetadata struct {
 	// 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 {
@@ -31,9 +34,11 @@ type Sniffer struct {
 func NewSniffer(ctx context.Context) *Sniffer {
 	ret := &Sniffer{
 		sniffer: []protocolSnifferWithMetadata{
-			{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false},
+			{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},
+			{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},
+			{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 {
@@ -49,11 +54,11 @@ func NewSniffer(ctx context.Context) *Sniffer {
 
 var errUnknownContent = newError("unknown content")
 
-func (s *Sniffer) Sniff(c context.Context, payload []byte) (SniffResult, error) {
+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 {
+		if si.metadataSniffer || si.network != network {
 			continue
 		}
 		result, err := s(c, payload)

app/dns/dns.go

@@ -223,6 +223,22 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, error) {
 	return nil, newError("returning nil for domain ", domain).Base(errors.Combine(errs...))
 }
 
+// LookupHosts implements dns.HostsLookup.
+func (s *DNS) LookupHosts(domain string) *net.Address {
+	domain = strings.TrimSuffix(domain, ".")
+	if domain == "" {
+		return nil
+	}
+	// Normalize the FQDN form query
+	addrs := s.hosts.Lookup(domain, *s.ipOption)
+	if len(addrs) > 0 {
+		newError("domain replaced: ", domain, " -> ", addrs[0].String()).AtInfo().WriteToLog()
+		return &addrs[0]
+	}
+
+	return nil
+}
+
 // GetIPOption implements ClientWithIPOption.
 func (s *DNS) GetIPOption() *dns.IPOption {
 	return s.ipOption

app/dns/dnscommon.go

@@ -5,15 +5,14 @@ import (
 	"strings"
 	"time"
 
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
 	dns_feature "github.com/xtls/xray-core/features/dns"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
-// Fqdn normalize domain make sure it ends with '.'
+// Fqdn normalizes domain make sure it ends with '.'
 func Fqdn(domain string) string {
 	if len(domain) > 0 && strings.HasSuffix(domain, ".") {
 		return domain
@@ -163,7 +162,7 @@ func buildReqMsgs(domain string, option dns_feature.IPOption, reqIDGen func() ui
 	return reqs
 }
 
-// parseResponse parse DNS answers from the returned payload
+// parseResponse parses DNS answers from the returned payload
 func parseResponse(payload []byte) (*IPRecord, error) {
 	var parser dnsmessage.Parser
 	h, err := parser.Start(payload)

app/dns/dnscommon_test.go

@@ -7,11 +7,10 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/miekg/dns"
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	dns_feature "github.com/xtls/xray-core/features/dns"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 func Test_parseResponse(t *testing.T) {

app/dns/fakedns/fake.go

@@ -5,6 +5,7 @@ import (
 	"math"
 	"math/big"
 	gonet "net"
+	"sync"
 	"time"
 
 	"github.com/xtls/xray-core/common"
@@ -16,6 +17,7 @@ import (
 type Holder struct {
 	domainToIP cache.Lru
 	ipRange    *gonet.IPNet
+	mu         *sync.Mutex
 
 	config *FakeDnsPool
 }
@@ -49,6 +51,7 @@ func (fkdns *Holder) Start() error {
 func (fkdns *Holder) Close() error {
 	fkdns.domainToIP = nil
 	fkdns.ipRange = nil
+	fkdns.mu = nil
 	return nil
 }
 
@@ -67,7 +70,7 @@ func NewFakeDNSHolder() (*Holder, error) {
 }
 
 func NewFakeDNSHolderConfigOnly(conf *FakeDnsPool) (*Holder, error) {
-	return &Holder{nil, nil, conf}, nil
+	return &Holder{nil, nil, nil, conf}, nil
 }
 
 func (fkdns *Holder) initializeFromConfig() error {
@@ -89,11 +92,14 @@ func (fkdns *Holder) initialize(ipPoolCidr string, lruSize int) error {
 	}
 	fkdns.domainToIP = cache.NewLru(lruSize)
 	fkdns.ipRange = ipRange
+	fkdns.mu = new(sync.Mutex)
 	return nil
 }
 
-// GetFakeIPForDomain check and generate a fake IP for a domain name
+// GetFakeIPForDomain checks and generates a fake IP for a domain name
 func (fkdns *Holder) GetFakeIPForDomain(domain string) []net.Address {
+	fkdns.mu.Lock()
+	defer fkdns.mu.Unlock()
 	if v, ok := fkdns.domainToIP.Get(domain); ok {
 		return []net.Address{v.(net.Address)}
 	}
@@ -123,7 +129,7 @@ func (fkdns *Holder) GetFakeIPForDomain(domain string) []net.Address {
 	return []net.Address{ip}
 }
 
-// GetDomainFromFakeDNS check if an IP is a fake IP and have corresponding domain name
+// GetDomainFromFakeDNS checks if an IP is a fake IP and have corresponding domain name
 func (fkdns *Holder) GetDomainFromFakeDNS(ip net.Address) string {
 	if !ip.Family().IsIP() || !fkdns.ipRange.Contains(ip.IP()) {
 		return ""

app/dns/fakedns/fakedns_test.go

@@ -1,16 +1,16 @@
 package fakedns
 
 import (
+	gonet "net"
+	"strconv"
 	"testing"
 
-	gonet "net"
-
 	"github.com/stretchr/testify/assert"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/uuid"
 	"github.com/xtls/xray-core/features/dns"
+	"golang.org/x/sync/errgroup"
 )
 
 var ipPrefix = "198.1"
@@ -67,6 +67,31 @@ func TestFakeDnsHolderCreateMappingManySingleDomain(t *testing.T) {
 	assert.Equal(t, addr[0].IP().String(), addr2[0].IP().String())
 }
 
+func TestGetFakeIPForDomainConcurrently(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	total := 200
+	addr := make([][]net.Address, total)
+	var errg errgroup.Group
+	for i := 0; i < total; i++ {
+		errg.Go(testGetFakeIP(i, addr, fkdns))
+	}
+	errg.Wait()
+	for i := 0; i < total; i++ {
+		for j := i + 1; j < total; j++ {
+			assert.NotEqual(t, addr[i][0].IP().String(), addr[j][0].IP().String())
+		}
+	}
+}
+
+func testGetFakeIP(index int, addr [][]net.Address, fkdns *Holder) func() error {
+	return func() error {
+		addr[index] = fkdns.GetFakeIPForDomain("fakednstest" + strconv.Itoa(index) + ".example.com")
+		return nil
+	}
+}
+
 func TestFakeDnsHolderCreateMappingAndRollOver(t *testing.T) {
 	fkdns, err := NewFakeDNSHolderConfigOnly(&FakeDnsPool{
 		IpPool:  dns.FakeIPv4Pool,
@@ -148,31 +173,31 @@ func TestFakeDNSMulti(t *testing.T) {
 	})
 
 	t.Run("allocateTwoAddressForTwoPool", func(t *testing.T) {
-		address := fakeMulti.GetFakeIPForDomain("fakednstest.v2fly.org")
+		address := fakeMulti.GetFakeIPForDomain("fakednstest.example.com")
 		assert.Len(t, address, 2, "should be 2 address one for each pool")
 		t.Run("eachOfThemShouldResolve:0", func(t *testing.T) {
 			domain := fakeMulti.GetDomainFromFakeDNS(address[0])
-			assert.Equal(t, "fakednstest.v2fly.org", domain)
+			assert.Equal(t, "fakednstest.example.com", domain)
 		})
 		t.Run("eachOfThemShouldResolve:1", func(t *testing.T) {
 			domain := fakeMulti.GetDomainFromFakeDNS(address[1])
-			assert.Equal(t, "fakednstest.v2fly.org", domain)
+			assert.Equal(t, "fakednstest.example.com", domain)
 		})
 	})
 
 	t.Run("understandIPTypeSelector", func(t *testing.T) {
 		t.Run("ipv4", func(t *testing.T) {
-			address := fakeMulti.GetFakeIPForDomain3("fakednstestipv4.v2fly.org", true, false)
+			address := fakeMulti.GetFakeIPForDomain3("fakednstestipv4.example.com", true, false)
 			assert.Len(t, address, 1, "should be 1 address")
 			assert.True(t, address[0].Family().IsIPv4())
 		})
 		t.Run("ipv6", func(t *testing.T) {
-			address := fakeMulti.GetFakeIPForDomain3("fakednstestipv6.v2fly.org", false, true)
+			address := fakeMulti.GetFakeIPForDomain3("fakednstestipv6.example.com", false, true)
 			assert.Len(t, address, 1, "should be 1 address")
 			assert.True(t, address[0].Family().IsIPv6())
 		})
 		t.Run("ipv46", func(t *testing.T) {
-			address := fakeMulti.GetFakeIPForDomain3("fakednstestipv46.v2fly.org", true, true)
+			address := fakeMulti.GetFakeIPForDomain3("fakednstestipv46.example.com", true, true)
 			assert.Len(t, address, 2, "should be 2 address")
 			assert.True(t, address[0].Family().IsIPv4())
 			assert.True(t, address[1].Family().IsIPv6())

app/dns/nameserver.go

@@ -186,7 +186,7 @@ func (c *Client) Name() string {
 	return c.server.Name()
 }
 
-// QueryIP send DNS query to the name server with the client's IP.
+// QueryIP sends DNS query to the name server with the client's IP.
 func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption, disableCache bool) ([]net.IP, error) {
 	ctx, cancel := context.WithTimeout(ctx, 4*time.Second)
 	ips, err := c.server.QueryIP(ctx, domain, c.clientIP, option, disableCache)

app/dns/nameserver_doh.go

@@ -11,8 +11,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
@@ -24,6 +22,7 @@ import (
 	dns_feature "github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport/internet"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 // DoHNameServer implemented DNS over HTTPS (RFC8484) Wire Format,

app/dns/nameserver_doh_test.go

@@ -7,7 +7,6 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"

app/dns/nameserver_local.go

@@ -4,9 +4,8 @@ import (
 	"context"
 	"strings"
 
-	"github.com/xtls/xray-core/features/dns"
-
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/dns/localdns"
 )
 

app/dns/nameserver_local_test.go

@@ -5,10 +5,9 @@ import (
 	"testing"
 	"time"
 
-	"github.com/xtls/xray-core/common/net"
-
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/features/dns"
 )
 

app/dns/nameserver_quic.go

@@ -36,7 +36,7 @@ type QUICNameServer struct {
 	reqID       uint32
 	name        string
 	destination *net.Destination
-	session     quic.Session
+	connection  quic.Connection
 }
 
 // NewQUICNameServer creates DNS-over-QUIC client object for local resolving
@@ -193,7 +193,7 @@ func (s *QUICNameServer) sendQuery(ctx context.Context, domain string, clientIP
 
 			conn, err := s.openStream(dnsCtx)
 			if err != nil {
-				newError("failed to open quic session").Base(err).AtError().WriteToLog()
+				newError("failed to open quic connection").Base(err).AtError().WriteToLog()
 				return
 			}
 
@@ -321,7 +321,7 @@ func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, clientIP ne
 	}
 }
 
-func isActive(s quic.Session) bool {
+func isActive(s quic.Connection) bool {
 	select {
 	case <-s.Context().Done():
 		return false
@@ -330,17 +330,17 @@ func isActive(s quic.Session) bool {
 	}
 }
 
-func (s *QUICNameServer) getSession() (quic.Session, error) {
+func (s *QUICNameServer) getConnection() (quic.Connection, error) {
-	var session quic.Session
+	var conn quic.Connection
 	s.RLock()
-	session = s.session
+	conn = s.connection
-	if session != nil && isActive(session) {
+	if conn != nil && isActive(conn) {
 		s.RUnlock()
-		return session, nil
+		return conn, nil
 	}
-	if session != nil {
+	if conn != nil {
-		// we're recreating the session, let's create a new one
+		// we're recreating the connection, let's create a new one
-		_ = session.CloseWithError(0, "")
+		_ = conn.CloseWithError(0, "")
 	}
 	s.RUnlock()
 
@@ -348,42 +348,42 @@ func (s *QUICNameServer) getSession() (quic.Session, error) {
 	defer s.Unlock()
 
 	var err error
-	session, err = s.openSession()
+	conn, err = s.openConnection()
 	if err != nil {
 		// This does not look too nice, but QUIC (or maybe quic-go)
 		// doesn't seem stable enough.
 		// Maybe retransmissions aren't fully implemented in quic-go?
 		// Anyways, the simple solution is to make a second try when
-		// it fails to open the QUIC session.
+		// it fails to open the QUIC connection.
-		session, err = s.openSession()
+		conn, err = s.openConnection()
 		if err != nil {
 			return nil, err
 		}
 	}
-	s.session = session
+	s.connection = conn
-	return session, nil
+	return conn, nil
 }
 
-func (s *QUICNameServer) openSession() (quic.Session, error) {
+func (s *QUICNameServer) openConnection() (quic.Connection, error) {
 	tlsConfig := tls.Config{}
 	quicConfig := &quic.Config{
 		HandshakeIdleTimeout: handshakeTimeout,
 	}
 
-	session, err := quic.DialAddrContext(context.Background(), s.destination.NetAddr(), tlsConfig.GetTLSConfig(tls.WithNextProto("http/1.1", http2.NextProtoTLS, NextProtoDQ)), quicConfig)
+	conn, err := quic.DialAddrContext(context.Background(), s.destination.NetAddr(), tlsConfig.GetTLSConfig(tls.WithNextProto("http/1.1", http2.NextProtoTLS, NextProtoDQ)), quicConfig)
 	if err != nil {
 		return nil, err
 	}
 
-	return session, nil
+	return conn, nil
 }
 
 func (s *QUICNameServer) openStream(ctx context.Context) (quic.Stream, error) {
-	session, err := s.getSession()
+	conn, err := s.getConnection()
 	if err != nil {
 		return nil, err
 	}
 
 	// open a new stream
-	return session.OpenStreamSync(ctx)
+	return conn.OpenStreamSync(ctx)
 }

app/dns/nameserver_quic_test.go

@@ -6,13 +6,11 @@ import (
 	"testing"
 	"time"
 
-	"github.com/xtls/xray-core/features/dns"
-
 	"github.com/google/go-cmp/cmp"
-
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/dns"
 )
 
 func TestQUICNameServer(t *testing.T) {

app/dns/nameserver_tcp.go

@@ -9,8 +9,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/net"
@@ -22,6 +20,7 @@ import (
 	dns_feature "github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport/internet"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 // TCPNameServer implemented DNS over TCP (RFC7766).

app/dns/nameserver_tcp_test.go

@@ -7,7 +7,6 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"

app/dns/nameserver_udp.go

@@ -7,8 +7,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
@@ -17,9 +15,11 @@ import (
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/common/signal/pubsub"
 	"github.com/xtls/xray-core/common/task"
+	"github.com/xtls/xray-core/core"
 	dns_feature "github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport/internet/udp"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 // ClassicNameServer implemented traditional UDP DNS.
@@ -195,7 +195,7 @@ func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, client
 	for _, req := range reqs {
 		s.addPendingRequest(req)
 		b, _ := dns.PackMessage(req.msg)
-		udpCtx := context.Background()
+		udpCtx := core.ToBackgroundDetachedContext(ctx)
 		if inbound := session.InboundFromContext(ctx); inbound != nil {
 			udpCtx = session.ContextWithInbound(udpCtx, inbound)
 		}

app/log/command/command.go

@@ -5,11 +5,10 @@ package command
 import (
 	"context"
 
-	grpc "google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/app/log"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/core"
+	grpc "google.golang.org/grpc"
 )
 
 type LoggerServer struct {

app/log/command/config_grpc.pb.go

@@ -1,4 +1,8 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.18.0
+// source: app/log/command/config.proto
 
 package command
 

app/log/log_creator.go

@@ -1,6 +1,8 @@
 package log
 
 import (
+	"sync"
+
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/log"
 )
@@ -13,16 +15,24 @@ type HandlerCreator func(LogType, HandlerCreatorOptions) (log.Handler, error)
 
 var handlerCreatorMap = make(map[LogType]HandlerCreator)
 
+var handlerCreatorMapLock = &sync.RWMutex{}
+
 func RegisterHandlerCreator(logType LogType, f HandlerCreator) error {
 	if f == nil {
 		return newError("nil HandlerCreator")
 	}
 
+	handlerCreatorMapLock.Lock()
+	defer handlerCreatorMapLock.Unlock()
+
 	handlerCreatorMap[logType] = f
 	return nil
 }
 
 func createHandler(logType LogType, options HandlerCreatorOptions) (log.Handler, error) {
+	handlerCreatorMapLock.RLock()
+	defer handlerCreatorMapLock.RUnlock()
+
 	creator, found := handlerCreatorMap[logType]
 	if !found {
 		return nil, newError("unable to create log handler for ", logType)

app/log/log_test.go

@@ -5,7 +5,6 @@ import (
 	"testing"
 
 	"github.com/golang/mock/gomock"
-
 	"github.com/xtls/xray-core/app/log"
 	"github.com/xtls/xray-core/common"
 	clog "github.com/xtls/xray-core/common/log"

app/metrics/config.pb.go

@@ -0,0 +1,149 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
+// source: app/metrics/config.proto
+
+package metrics
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// Config is the settings for metrics.
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Tag of the outbound handler that handles metrics http connections.
+	Tag string `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_metrics_config_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Config) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Config) ProtoMessage() {}
+
+func (x *Config) ProtoReflect() protoreflect.Message {
+	mi := &file_app_metrics_config_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Config.ProtoReflect.Descriptor instead.
+func (*Config) Descriptor() ([]byte, []int) {
+	return file_app_metrics_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetTag() string {
+	if x != nil {
+		return x.Tag
+	}
+	return ""
+}
+
+var File_app_metrics_config_proto protoreflect.FileDescriptor
+
+var file_app_metrics_config_proto_rawDesc = []byte{
+	0x0a, 0x18, 0x61, 0x70, 0x70, 0x2f, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2f, 0x63, 0x6f,
+	0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x10, 0x78, 0x72, 0x61, 0x79,
+	0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x22, 0x1a, 0x0a, 0x06,
+	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x10, 0x0a, 0x03, 0x74, 0x61, 0x67, 0x18, 0x01, 0x20,
+	0x01, 0x28, 0x09, 0x52, 0x03, 0x74, 0x61, 0x67, 0x42, 0x52, 0x0a, 0x14, 0x63, 0x6f, 0x6d, 0x2e,
+	0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73,
+	0x50, 0x01, 0x5a, 0x25, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78,
+	0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70,
+	0x70, 0x2f, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0xaa, 0x02, 0x10, 0x58, 0x72, 0x61, 0x79,
+	0x2e, 0x41, 0x70, 0x70, 0x2e, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_app_metrics_config_proto_rawDescOnce sync.Once
+	file_app_metrics_config_proto_rawDescData = file_app_metrics_config_proto_rawDesc
+)
+
+func file_app_metrics_config_proto_rawDescGZIP() []byte {
+	file_app_metrics_config_proto_rawDescOnce.Do(func() {
+		file_app_metrics_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_metrics_config_proto_rawDescData)
+	})
+	return file_app_metrics_config_proto_rawDescData
+}
+
+var file_app_metrics_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_app_metrics_config_proto_goTypes = []interface{}{
+	(*Config)(nil), // 0: xray.app.metrics.Config
+}
+var file_app_metrics_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_app_metrics_config_proto_init() }
+func file_app_metrics_config_proto_init() {
+	if File_app_metrics_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_app_metrics_config_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_app_metrics_config_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_app_metrics_config_proto_goTypes,
+		DependencyIndexes: file_app_metrics_config_proto_depIdxs,
+		MessageInfos:      file_app_metrics_config_proto_msgTypes,
+	}.Build()
+	File_app_metrics_config_proto = out.File
+	file_app_metrics_config_proto_rawDesc = nil
+	file_app_metrics_config_proto_goTypes = nil
+	file_app_metrics_config_proto_depIdxs = nil
+}

app/metrics/config.proto

@@ -0,0 +1,13 @@
+syntax = "proto3";
+
+package xray.app.metrics;
+option csharp_namespace = "Xray.App.Metrics";
+option go_package = "github.com/xtls/xray-core/app/metrics";
+option java_package = "com.xray.app.metrics";
+option java_multiple_files = true;
+
+// Config is the settings for metrics.
+message Config {
+  // Tag of the outbound handler that handles metrics http connections.
+  string tag = 1;
+}

app/metrics/errors.generated.go

@@ -0,0 +1,9 @@
+package metrics
+
+import "github.com/xtls/xray-core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}

app/metrics/metrics.go

@@ -0,0 +1,118 @@
+package metrics
+
+import (
+	"context"
+	"expvar"
+	"net/http"
+	_ "net/http/pprof"
+	"strings"
+
+	"github.com/xtls/xray-core/app/observatory"
+	"github.com/xtls/xray-core/app/stats"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/signal/done"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/extension"
+	"github.com/xtls/xray-core/features/outbound"
+	feature_stats "github.com/xtls/xray-core/features/stats"
+)
+
+type MetricsHandler struct {
+	ohm          outbound.Manager
+	statsManager feature_stats.Manager
+	observatory  extension.Observatory
+	tag          string
+}
+
+// NewMetricsHandler creates a new MetricsHandler based on the given config.
+func NewMetricsHandler(ctx context.Context, config *Config) (*MetricsHandler, error) {
+	c := &MetricsHandler{
+		tag: config.Tag,
+	}
+	common.Must(core.RequireFeatures(ctx, func(om outbound.Manager, sm feature_stats.Manager) {
+		c.statsManager = sm
+		c.ohm = om
+	}))
+	expvar.Publish("stats", expvar.Func(func() interface{} {
+		manager, ok := c.statsManager.(*stats.Manager)
+		if !ok {
+			return nil
+		}
+		resp := map[string]map[string]map[string]int64{
+			"inbound":  {},
+			"outbound": {},
+			"user":     {},
+		}
+		manager.VisitCounters(func(name string, counter feature_stats.Counter) bool {
+			nameSplit := strings.Split(name, ">>>")
+			typeName, tagOrUser, direction := nameSplit[0], nameSplit[1], nameSplit[3]
+			if item, found := resp[typeName][tagOrUser]; found {
+				item[direction] = counter.Value()
+			} else {
+				resp[typeName][tagOrUser] = map[string]int64{
+					direction: counter.Value(),
+				}
+			}
+			return true
+		})
+		return resp
+	}))
+	expvar.Publish("observatory", expvar.Func(func() interface{} {
+		if c.observatory == nil {
+			common.Must(core.RequireFeatures(ctx, func(observatory extension.Observatory) error {
+				c.observatory = observatory
+				return nil
+			}))
+			if c.observatory == nil {
+				return nil
+			}
+		}
+		resp := map[string]*observatory.OutboundStatus{}
+		if o, err := c.observatory.GetObservation(context.Background()); err != nil {
+			return err
+		} else {
+			for _, x := range o.(*observatory.ObservationResult).GetStatus() {
+				resp[x.OutboundTag] = x
+			}
+		}
+		return resp
+	}))
+	return c, nil
+}
+
+func (p *MetricsHandler) Type() interface{} {
+	return (*MetricsHandler)(nil)
+}
+
+func (p *MetricsHandler) Start() error {
+	listener := &OutboundListener{
+		buffer: make(chan net.Conn, 4),
+		done:   done.New(),
+	}
+
+	go func() {
+		if err := http.Serve(listener, http.DefaultServeMux); err != nil {
+			newError("failed to start metrics server").Base(err).AtError().WriteToLog()
+		}
+	}()
+
+	if err := p.ohm.RemoveHandler(context.Background(), p.tag); err != nil {
+		newError("failed to remove existing handler").WriteToLog()
+	}
+
+	return p.ohm.AddHandler(context.Background(), &Outbound{
+		tag:      p.tag,
+		listener: listener,
+	})
+}
+
+func (p *MetricsHandler) Close() error {
+	return nil
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, cfg interface{}) (interface{}, error) {
+		return NewMetricsHandler(ctx, cfg.(*Config))
+	}))
+}

app/metrics/outbound.go

@@ -0,0 +1,109 @@
+package metrics
+
+import (
+	"context"
+	"sync"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net/cnc"
+	"github.com/xtls/xray-core/common/signal/done"
+	"github.com/xtls/xray-core/transport"
+)
+
+// OutboundListener is a net.Listener for listening metrics http connections.
+type OutboundListener struct {
+	buffer chan net.Conn
+	done   *done.Instance
+}
+
+func (l *OutboundListener) add(conn net.Conn) {
+	select {
+	case l.buffer <- conn:
+	case <-l.done.Wait():
+		conn.Close()
+	default:
+		conn.Close()
+	}
+}
+
+// Accept implements net.Listener.
+func (l *OutboundListener) Accept() (net.Conn, error) {
+	select {
+	case <-l.done.Wait():
+		return nil, newError("listen closed")
+	case c := <-l.buffer:
+		return c, nil
+	}
+}
+
+// Close implement net.Listener.
+func (l *OutboundListener) Close() error {
+	common.Must(l.done.Close())
+L:
+	for {
+		select {
+		case c := <-l.buffer:
+			c.Close()
+		default:
+			break L
+		}
+	}
+	return nil
+}
+
+// Addr implements net.Listener.
+func (l *OutboundListener) Addr() net.Addr {
+	return &net.TCPAddr{
+		IP:   net.IP{0, 0, 0, 0},
+		Port: 0,
+	}
+}
+
+// Outbound is an outbound.Handler that handles metrics http connections.
+type Outbound struct {
+	tag      string
+	listener *OutboundListener
+	access   sync.RWMutex
+	closed   bool
+}
+
+// Dispatch implements outbound.Handler.
+func (co *Outbound) Dispatch(ctx context.Context, link *transport.Link) {
+	co.access.RLock()
+
+	if co.closed {
+		common.Interrupt(link.Reader)
+		common.Interrupt(link.Writer)
+		co.access.RUnlock()
+		return
+	}
+
+	closeSignal := done.New()
+	c := cnc.NewConnection(cnc.ConnectionInputMulti(link.Writer), cnc.ConnectionOutputMulti(link.Reader), cnc.ConnectionOnClose(closeSignal))
+	co.listener.add(c)
+	co.access.RUnlock()
+	<-closeSignal.Wait()
+}
+
+// Tag implements outbound.Handler.
+func (co *Outbound) Tag() string {
+	return co.tag
+}
+
+// Start implements common.Runnable.
+func (co *Outbound) Start() error {
+	co.access.Lock()
+	co.closed = false
+	co.access.Unlock()
+	return nil
+}
+
+// Close implements common.Closable.
+func (co *Outbound) Close() error {
+	co.access.Lock()
+	defer co.access.Unlock()
+
+	co.closed = true
+	return co.listener.Close()
+}

app/observatory/command/command.go

@@ -0,0 +1,50 @@
+//go:build !confonly
+// +build !confonly
+
+package command
+
+import (
+	"context"
+
+	"github.com/xtls/xray-core/app/observatory"
+	"github.com/xtls/xray-core/common"
+	core "github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/extension"
+	"google.golang.org/grpc"
+)
+
+type service struct {
+	UnimplementedObservatoryServiceServer
+	v *core.Instance
+
+	observatory extension.Observatory
+}
+
+func (s *service) GetOutboundStatus(ctx context.Context, request *GetOutboundStatusRequest) (*GetOutboundStatusResponse, error) {
+	resp, err := s.observatory.GetObservation(ctx)
+	if err != nil {
+		return nil, err
+	}
+	retdata := resp.(*observatory.ObservationResult)
+	return &GetOutboundStatusResponse{
+		Status: retdata,
+	}, nil
+}
+
+func (s *service) Register(server *grpc.Server) {
+	RegisterObservatoryServiceServer(server, s)
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, cfg interface{}) (interface{}, error) {
+		s := core.MustFromContext(ctx)
+		sv := &service{v: s}
+		err := s.RequireFeatures(func(Observatory extension.Observatory) {
+			sv.observatory = Observatory
+		})
+		if err != nil {
+			return nil, err
+		}
+		return sv, nil
+	}))
+}

app/observatory/command/command.pb.go

@@ -0,0 +1,278 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.27.1
+// 	protoc        v3.18.0
+// source: app/observatory/command/command.proto
+
+package command
+
+import (
+	observatory "github.com/xtls/xray-core/app/observatory"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type GetOutboundStatusRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *GetOutboundStatusRequest) Reset() {
+	*x = GetOutboundStatusRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_command_command_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetOutboundStatusRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetOutboundStatusRequest) ProtoMessage() {}
+
+func (x *GetOutboundStatusRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_command_command_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetOutboundStatusRequest.ProtoReflect.Descriptor instead.
+func (*GetOutboundStatusRequest) Descriptor() ([]byte, []int) {
+	return file_app_observatory_command_command_proto_rawDescGZIP(), []int{0}
+}
+
+type GetOutboundStatusResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Status *observatory.ObservationResult `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
+}
+
+func (x *GetOutboundStatusResponse) Reset() {
+	*x = GetOutboundStatusResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_command_command_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetOutboundStatusResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetOutboundStatusResponse) ProtoMessage() {}
+
+func (x *GetOutboundStatusResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_command_command_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetOutboundStatusResponse.ProtoReflect.Descriptor instead.
+func (*GetOutboundStatusResponse) Descriptor() ([]byte, []int) {
+	return file_app_observatory_command_command_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *GetOutboundStatusResponse) GetStatus() *observatory.ObservationResult {
+	if x != nil {
+		return x.Status
+	}
+	return nil
+}
+
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_command_command_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Config) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Config) ProtoMessage() {}
+
+func (x *Config) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_command_command_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Config.ProtoReflect.Descriptor instead.
+func (*Config) Descriptor() ([]byte, []int) {
+	return file_app_observatory_command_command_proto_rawDescGZIP(), []int{2}
+}
+
+var File_app_observatory_command_command_proto protoreflect.FileDescriptor
+
+var file_app_observatory_command_command_proto_rawDesc = []byte{
+	0x0a, 0x25, 0x61, 0x70, 0x70, 0x2f, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f, 0x72,
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+	0x79, 0x2e, 0x43, 0x6f, 0x72, 0x65, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x4f, 0x62, 0x73, 0x65, 0x72,
+	0x76, 0x61, 0x74, 0x6f, 0x72, 0x79, 0x2e, 0x43, 0x6f, 0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_app_observatory_command_command_proto_rawDescOnce sync.Once
+	file_app_observatory_command_command_proto_rawDescData = file_app_observatory_command_command_proto_rawDesc
+)
+
+func file_app_observatory_command_command_proto_rawDescGZIP() []byte {
+	file_app_observatory_command_command_proto_rawDescOnce.Do(func() {
+		file_app_observatory_command_command_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_observatory_command_command_proto_rawDescData)
+	})
+	return file_app_observatory_command_command_proto_rawDescData
+}
+
+var file_app_observatory_command_command_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_app_observatory_command_command_proto_goTypes = []interface{}{
+	(*GetOutboundStatusRequest)(nil),      // 0: xray.core.app.observatory.command.GetOutboundStatusRequest
+	(*GetOutboundStatusResponse)(nil),     // 1: xray.core.app.observatory.command.GetOutboundStatusResponse
+	(*Config)(nil),                        // 2: xray.core.app.observatory.command.Config
+	(*observatory.ObservationResult)(nil), // 3: xray.core.app.observatory.ObservationResult
+}
+var file_app_observatory_command_command_proto_depIdxs = []int32{
+	3, // 0: xray.core.app.observatory.command.GetOutboundStatusResponse.status:type_name -> xray.core.app.observatory.ObservationResult
+	0, // 1: xray.core.app.observatory.command.ObservatoryService.GetOutboundStatus:input_type -> xray.core.app.observatory.command.GetOutboundStatusRequest
+	1, // 2: xray.core.app.observatory.command.ObservatoryService.GetOutboundStatus:output_type -> xray.core.app.observatory.command.GetOutboundStatusResponse
+	2, // [2:3] is the sub-list for method output_type
+	1, // [1:2] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_app_observatory_command_command_proto_init() }
+func file_app_observatory_command_command_proto_init() {
+	if File_app_observatory_command_command_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_app_observatory_command_command_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetOutboundStatusRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_observatory_command_command_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetOutboundStatusResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_observatory_command_command_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_app_observatory_command_command_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   3,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_app_observatory_command_command_proto_goTypes,
+		DependencyIndexes: file_app_observatory_command_command_proto_depIdxs,
+		MessageInfos:      file_app_observatory_command_command_proto_msgTypes,
+	}.Build()
+	File_app_observatory_command_command_proto = out.File
+	file_app_observatory_command_command_proto_rawDesc = nil
+	file_app_observatory_command_command_proto_goTypes = nil
+	file_app_observatory_command_command_proto_depIdxs = nil
+}

app/observatory/command/command.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package xray.core.app.observatory.command;
+option csharp_namespace = "Xray.Core.App.Observatory.Command";
+option go_package = "github.com/xtls/xray-core/app/observatory/command";
+option java_package = "com.xray.core.app.observatory.command";
+option java_multiple_files = true;
+
+import "app/observatory/config.proto";
+
+message GetOutboundStatusRequest {
+}
+
+message GetOutboundStatusResponse {
+  xray.core.app.observatory.ObservationResult status = 1;
+}
+
+service ObservatoryService {
+  rpc GetOutboundStatus(GetOutboundStatusRequest)
+      returns (GetOutboundStatusResponse) {}
+}
+
+
+message Config {}

app/observatory/command/command_grpc.pb.go

@@ -0,0 +1,105 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.18.0
+// source: app/observatory/command/command.proto
+
+package command
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// ObservatoryServiceClient is the client API for ObservatoryService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type ObservatoryServiceClient interface {
+	GetOutboundStatus(ctx context.Context, in *GetOutboundStatusRequest, opts ...grpc.CallOption) (*GetOutboundStatusResponse, error)
+}
+
+type observatoryServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewObservatoryServiceClient(cc grpc.ClientConnInterface) ObservatoryServiceClient {
+	return &observatoryServiceClient{cc}
+}
+
+func (c *observatoryServiceClient) GetOutboundStatus(ctx context.Context, in *GetOutboundStatusRequest, opts ...grpc.CallOption) (*GetOutboundStatusResponse, error) {
+	out := new(GetOutboundStatusResponse)
+	err := c.cc.Invoke(ctx, "/xray.core.app.observatory.command.ObservatoryService/GetOutboundStatus", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ObservatoryServiceServer is the server API for ObservatoryService service.
+// All implementations must embed UnimplementedObservatoryServiceServer
+// for forward compatibility
+type ObservatoryServiceServer interface {
+	GetOutboundStatus(context.Context, *GetOutboundStatusRequest) (*GetOutboundStatusResponse, error)
+	mustEmbedUnimplementedObservatoryServiceServer()
+}
+
+// UnimplementedObservatoryServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedObservatoryServiceServer struct {
+}
+
+func (UnimplementedObservatoryServiceServer) GetOutboundStatus(context.Context, *GetOutboundStatusRequest) (*GetOutboundStatusResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetOutboundStatus not implemented")
+}
+func (UnimplementedObservatoryServiceServer) mustEmbedUnimplementedObservatoryServiceServer() {}
+
+// UnsafeObservatoryServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ObservatoryServiceServer will
+// result in compilation errors.
+type UnsafeObservatoryServiceServer interface {
+	mustEmbedUnimplementedObservatoryServiceServer()
+}
+
+func RegisterObservatoryServiceServer(s grpc.ServiceRegistrar, srv ObservatoryServiceServer) {
+	s.RegisterService(&ObservatoryService_ServiceDesc, srv)
+}
+
+func _ObservatoryService_GetOutboundStatus_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetOutboundStatusRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ObservatoryServiceServer).GetOutboundStatus(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/xray.core.app.observatory.command.ObservatoryService/GetOutboundStatus",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ObservatoryServiceServer).GetOutboundStatus(ctx, req.(*GetOutboundStatusRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// ObservatoryService_ServiceDesc is the grpc.ServiceDesc for ObservatoryService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var ObservatoryService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "xray.core.app.observatory.command.ObservatoryService",
+	HandlerType: (*ObservatoryServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GetOutboundStatus",
+			Handler:    _ObservatoryService_GetOutboundStatus_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "app/observatory/command/command.proto",
+}

app/observatory/config.pb.go

@@ -0,0 +1,530 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.27.1
+// 	protoc        v3.18.0
+// source: app/observatory/config.proto
+
+package observatory
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type ObservationResult struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Status []*OutboundStatus `protobuf:"bytes,1,rep,name=status,proto3" json:"status,omitempty"`
+}
+
+func (x *ObservationResult) Reset() {
+	*x = ObservationResult{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_config_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ObservationResult) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ObservationResult) ProtoMessage() {}
+
+func (x *ObservationResult) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_config_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ObservationResult.ProtoReflect.Descriptor instead.
+func (*ObservationResult) Descriptor() ([]byte, []int) {
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ObservationResult) GetStatus() []*OutboundStatus {
+	if x != nil {
+		return x.Status
+	}
+	return nil
+}
+
+type OutboundStatus struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// @Document Whether this outbound is usable
+	//@Restriction ReadOnlyForUser
+	Alive bool `protobuf:"varint,1,opt,name=alive,proto3" json:"alive,omitempty"`
+	// @Document The time for probe request to finish.
+	//@Type time.ms
+	//@Restriction ReadOnlyForUser
+	Delay int64 `protobuf:"varint,2,opt,name=delay,proto3" json:"delay,omitempty"`
+	// @Document The last error caused this outbound failed to relay probe request
+	//@Restriction NotMachineReadable
+	LastErrorReason string `protobuf:"bytes,3,opt,name=last_error_reason,json=lastErrorReason,proto3" json:"last_error_reason,omitempty"`
+	// @Document The outbound tag for this Server
+	//@Type id.outboundTag
+	OutboundTag string `protobuf:"bytes,4,opt,name=outbound_tag,json=outboundTag,proto3" json:"outbound_tag,omitempty"`
+	// @Document The time this outbound is known to be alive
+	//@Type id.outboundTag
+	LastSeenTime int64 `protobuf:"varint,5,opt,name=last_seen_time,json=lastSeenTime,proto3" json:"last_seen_time,omitempty"`
+	// @Document The time this outbound is tried
+	//@Type id.outboundTag
+	LastTryTime int64 `protobuf:"varint,6,opt,name=last_try_time,json=lastTryTime,proto3" json:"last_try_time,omitempty"`
+}
+
+func (x *OutboundStatus) Reset() {
+	*x = OutboundStatus{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_config_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *OutboundStatus) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OutboundStatus) ProtoMessage() {}
+
+func (x *OutboundStatus) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_config_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use OutboundStatus.ProtoReflect.Descriptor instead.
+func (*OutboundStatus) Descriptor() ([]byte, []int) {
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *OutboundStatus) GetAlive() bool {
+	if x != nil {
+		return x.Alive
+	}
+	return false
+}
+
+func (x *OutboundStatus) GetDelay() int64 {
+	if x != nil {
+		return x.Delay
+	}
+	return 0
+}
+
+func (x *OutboundStatus) GetLastErrorReason() string {
+	if x != nil {
+		return x.LastErrorReason
+	}
+	return ""
+}
+
+func (x *OutboundStatus) GetOutboundTag() string {
+	if x != nil {
+		return x.OutboundTag
+	}
+	return ""
+}
+
+func (x *OutboundStatus) GetLastSeenTime() int64 {
+	if x != nil {
+		return x.LastSeenTime
+	}
+	return 0
+}
+
+func (x *OutboundStatus) GetLastTryTime() int64 {
+	if x != nil {
+		return x.LastTryTime
+	}
+	return 0
+}
+
+type ProbeResult struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// @Document Whether this outbound is usable
+	//@Restriction ReadOnlyForUser
+	Alive bool `protobuf:"varint,1,opt,name=alive,proto3" json:"alive,omitempty"`
+	// @Document The time for probe request to finish.
+	//@Type time.ms
+	//@Restriction ReadOnlyForUser
+	Delay int64 `protobuf:"varint,2,opt,name=delay,proto3" json:"delay,omitempty"`
+	// @Document The error caused this outbound failed to relay probe request
+	//@Restriction NotMachineReadable
+	LastErrorReason string `protobuf:"bytes,3,opt,name=last_error_reason,json=lastErrorReason,proto3" json:"last_error_reason,omitempty"`
+}
+
+func (x *ProbeResult) Reset() {
+	*x = ProbeResult{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_config_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ProbeResult) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ProbeResult) ProtoMessage() {}
+
+func (x *ProbeResult) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_config_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ProbeResult.ProtoReflect.Descriptor instead.
+func (*ProbeResult) Descriptor() ([]byte, []int) {
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *ProbeResult) GetAlive() bool {
+	if x != nil {
+		return x.Alive
+	}
+	return false
+}
+
+func (x *ProbeResult) GetDelay() int64 {
+	if x != nil {
+		return x.Delay
+	}
+	return 0
+}
+
+func (x *ProbeResult) GetLastErrorReason() string {
+	if x != nil {
+		return x.LastErrorReason
+	}
+	return ""
+}
+
+type Intensity struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// @Document The time interval for a probe request in ms.
+	//@Type time.ms
+	ProbeInterval uint32 `protobuf:"varint,1,opt,name=probe_interval,json=probeInterval,proto3" json:"probe_interval,omitempty"`
+}
+
+func (x *Intensity) Reset() {
+	*x = Intensity{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_config_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Intensity) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Intensity) ProtoMessage() {}
+
+func (x *Intensity) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_config_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Intensity.ProtoReflect.Descriptor instead.
+func (*Intensity) Descriptor() ([]byte, []int) {
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *Intensity) GetProbeInterval() uint32 {
+	if x != nil {
+		return x.ProbeInterval
+	}
+	return 0
+}
+
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// @Document The selectors for outbound under observation
+	SubjectSelector   []string `protobuf:"bytes,2,rep,name=subject_selector,json=subjectSelector,proto3" json:"subject_selector,omitempty"`
+	ProbeUrl          string   `protobuf:"bytes,3,opt,name=probe_url,json=probeUrl,proto3" json:"probe_url,omitempty"`
+	ProbeInterval     int64    `protobuf:"varint,4,opt,name=probe_interval,json=probeInterval,proto3" json:"probe_interval,omitempty"`
+	EnableConcurrency bool     `protobuf:"varint,5,opt,name=enable_concurrency,json=enableConcurrency,proto3" json:"enable_concurrency,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_config_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Config) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Config) ProtoMessage() {}
+
+func (x *Config) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_config_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Config.ProtoReflect.Descriptor instead.
+func (*Config) Descriptor() ([]byte, []int) {
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *Config) GetSubjectSelector() []string {
+	if x != nil {
+		return x.SubjectSelector
+	}
+	return nil
+}
+
+func (x *Config) GetProbeUrl() string {
+	if x != nil {
+		return x.ProbeUrl
+	}
+	return ""
+}
+
+func (x *Config) GetProbeInterval() int64 {
+	if x != nil {
+		return x.ProbeInterval
+	}
+	return 0
+}
+
+func (x *Config) GetEnableConcurrency() bool {
+	if x != nil {
+		return x.EnableConcurrency
+	}
+	return false
+}
+
+var File_app_observatory_config_proto protoreflect.FileDescriptor
+
+var file_app_observatory_config_proto_rawDesc = []byte{
+	0x0a, 0x1c, 0x61, 0x70, 0x70, 0x2f, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f, 0x72,
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+	0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f, 0x6f, 0x62, 0x73, 0x65, 0x72,
+	0x76, 0x61, 0x74, 0x6f, 0x72, 0x79, 0xaa, 0x02, 0x14, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70,
+	0x70, 0x2e, 0x4f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f, 0x72, 0x79, 0x62, 0x06, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_app_observatory_config_proto_rawDescOnce sync.Once
+	file_app_observatory_config_proto_rawDescData = file_app_observatory_config_proto_rawDesc
+)
+
+func file_app_observatory_config_proto_rawDescGZIP() []byte {
+	file_app_observatory_config_proto_rawDescOnce.Do(func() {
+		file_app_observatory_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_observatory_config_proto_rawDescData)
+	})
+	return file_app_observatory_config_proto_rawDescData
+}
+
+var file_app_observatory_config_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
+var file_app_observatory_config_proto_goTypes = []interface{}{
+	(*ObservationResult)(nil), // 0: xray.core.app.observatory.ObservationResult
+	(*OutboundStatus)(nil),    // 1: xray.core.app.observatory.OutboundStatus
+	(*ProbeResult)(nil),       // 2: xray.core.app.observatory.ProbeResult
+	(*Intensity)(nil),         // 3: xray.core.app.observatory.Intensity
+	(*Config)(nil),            // 4: xray.core.app.observatory.Config
+}
+var file_app_observatory_config_proto_depIdxs = []int32{
+	1, // 0: xray.core.app.observatory.ObservationResult.status:type_name -> xray.core.app.observatory.OutboundStatus
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_app_observatory_config_proto_init() }
+func file_app_observatory_config_proto_init() {
+	if File_app_observatory_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_app_observatory_config_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ObservationResult); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_observatory_config_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*OutboundStatus); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_observatory_config_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ProbeResult); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_observatory_config_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Intensity); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_observatory_config_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_app_observatory_config_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   5,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_app_observatory_config_proto_goTypes,
+		DependencyIndexes: file_app_observatory_config_proto_depIdxs,
+		MessageInfos:      file_app_observatory_config_proto_msgTypes,
+	}.Build()
+	File_app_observatory_config_proto = out.File
+	file_app_observatory_config_proto_rawDesc = nil
+	file_app_observatory_config_proto_goTypes = nil
+	file_app_observatory_config_proto_depIdxs = nil
+}

app/observatory/config.proto

@@ -0,0 +1,73 @@
+syntax = "proto3";
+
+package xray.core.app.observatory;
+option csharp_namespace = "Xray.App.Observatory";
+option go_package = "github.com/xtls/xray-core/app/observatory";
+option java_package = "com.xray.app.observatory";
+option java_multiple_files = true;
+
+message ObservationResult {
+  repeated OutboundStatus status = 1;
+}
+
+message OutboundStatus{
+  /* @Document Whether this outbound is usable
+     @Restriction ReadOnlyForUser
+  */
+  bool alive = 1;
+  /* @Document The time for probe request to finish.
+     @Type time.ms
+     @Restriction ReadOnlyForUser
+  */
+  int64 delay = 2;
+  /* @Document The last error caused this outbound failed to relay probe request
+     @Restriction NotMachineReadable
+  */
+  string last_error_reason = 3;
+  /* @Document The outbound tag for this Server
+     @Type id.outboundTag
+  */
+  string outbound_tag = 4;
+  /* @Document The time this outbound is known to be alive
+   @Type id.outboundTag
+*/
+  int64 last_seen_time = 5;
+  /* @Document The time this outbound is tried
+   @Type id.outboundTag
+*/
+  int64 last_try_time = 6;
+}
+
+message ProbeResult{
+  /* @Document Whether this outbound is usable
+     @Restriction ReadOnlyForUser
+  */
+  bool alive = 1;
+  /* @Document The time for probe request to finish.
+     @Type time.ms
+     @Restriction ReadOnlyForUser
+  */
+  int64 delay = 2;
+  /* @Document The error caused this outbound failed to relay probe request
+   @Restriction NotMachineReadable
+*/
+  string last_error_reason = 3;
+}
+
+message Intensity{
+  /* @Document The time interval for a probe request in ms.
+     @Type time.ms
+  */
+  uint32 probe_interval = 1;
+}
+message Config {
+  /* @Document The selectors for outbound under observation
+  */
+  repeated string subject_selector = 2;
+
+  string probe_url = 3;
+
+  int64 probe_interval = 4;
+
+  bool enable_concurrency = 5;
+}

app/observatory/errors.generated.go

@@ -0,0 +1,9 @@
+package observatory
+
+import "github.com/xtls/xray-core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}

app/observatory/explainErrors.go

@@ -0,0 +1,26 @@
+package observatory
+
+import "github.com/xtls/xray-core/common/errors"
+
+type errorCollector struct {
+	errors *errors.Error
+}
+
+func (e *errorCollector) SubmitError(err error) {
+	if e.errors == nil {
+		e.errors = newError("underlying connection error").Base(err)
+		return
+	}
+	e.errors = e.errors.Base(newError("underlying connection error").Base(err))
+}
+
+func newErrorCollector() *errorCollector {
+	return &errorCollector{}
+}
+
+func (e *errorCollector) UnderlyingError() error {
+	if e.errors == nil {
+		return newError("failed to produce report")
+	}
+	return e.errors
+}

app/observatory/observatory.go

@@ -0,0 +1,3 @@
+package observatory
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen

app/observatory/observer.go

@@ -0,0 +1,238 @@
+package observatory
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"net/url"
+	"sort"
+	"sync"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/xtls/xray-core/common"
+	v2net "github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/signal/done"
+	"github.com/xtls/xray-core/common/task"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/extension"
+	"github.com/xtls/xray-core/features/outbound"
+	"github.com/xtls/xray-core/transport/internet/tagged"
+)
+
+type Observer struct {
+	config *Config
+	ctx    context.Context
+
+	statusLock sync.Mutex
+	status     []*OutboundStatus
+
+	finished *done.Instance
+
+	ohm outbound.Manager
+}
+
+func (o *Observer) GetObservation(ctx context.Context) (proto.Message, error) {
+	return &ObservationResult{Status: o.status}, nil
+}
+
+func (o *Observer) Type() interface{} {
+	return extension.ObservatoryType()
+}
+
+func (o *Observer) Start() error {
+	if o.config != nil && len(o.config.SubjectSelector) != 0 {
+		o.finished = done.New()
+		go o.background()
+	}
+	return nil
+}
+
+func (o *Observer) Close() error {
+	if o.finished != nil {
+		return o.finished.Close()
+	}
+	return nil
+}
+
+func (o *Observer) background() {
+	for !o.finished.Done() {
+		hs, ok := o.ohm.(outbound.HandlerSelector)
+		if !ok {
+			newError("outbound.Manager is not a HandlerSelector").WriteToLog()
+			return
+		}
+
+		outbounds := hs.Select(o.config.SubjectSelector)
+
+		o.updateStatus(outbounds)
+
+		sleepTime := time.Second * 10
+		if o.config.ProbeInterval != 0 {
+			sleepTime = time.Duration(o.config.ProbeInterval)
+		}
+
+		if !o.config.EnableConcurrency {
+			sort.Strings(outbounds)
+			for _, v := range outbounds {
+				result := o.probe(v)
+				o.updateStatusForResult(v, &result)
+				if o.finished.Done() {
+					return
+				}
+				time.Sleep(sleepTime)
+			}
+			continue
+		}
+
+		ch := make(chan struct{}, len(outbounds))
+
+		for _, v := range outbounds {
+			go func(v string) {
+				result := o.probe(v)
+				o.updateStatusForResult(v, &result)
+				ch <- struct{}{}
+			}(v)
+		}
+
+		for range outbounds {
+			select {
+			case <-ch:
+			case <-o.finished.Wait():
+				return
+			}
+		}
+		time.Sleep(sleepTime)
+	}
+}
+
+func (o *Observer) updateStatus(outbounds []string) {
+	o.statusLock.Lock()
+	defer o.statusLock.Unlock()
+	// TODO should remove old inbound that is removed
+	_ = outbounds
+}
+
+func (o *Observer) probe(outbound string) ProbeResult {
+	errorCollectorForRequest := newErrorCollector()
+
+	httpTransport := http.Transport{
+		Proxy: func(*http.Request) (*url.URL, error) {
+			return nil, nil
+		},
+		DialContext: func(ctx context.Context, network string, addr string) (net.Conn, error) {
+			var connection net.Conn
+			taskErr := task.Run(ctx, func() error {
+				// MUST use Xray's built in context system
+				dest, err := v2net.ParseDestination(network + ":" + addr)
+				if err != nil {
+					return newError("cannot understand address").Base(err)
+				}
+				trackedCtx := session.TrackedConnectionError(o.ctx, errorCollectorForRequest)
+				conn, err := tagged.Dialer(trackedCtx, dest, outbound)
+				if err != nil {
+					return newError("cannot dial remote address ", dest).Base(err)
+				}
+				connection = conn
+				return nil
+			})
+			if taskErr != nil {
+				return nil, newError("cannot finish connection").Base(taskErr)
+			}
+			return connection, nil
+		},
+		TLSHandshakeTimeout: time.Second * 5,
+	}
+	httpClient := &http.Client{
+		Transport: &httpTransport,
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+		Jar:     nil,
+		Timeout: time.Second * 5,
+	}
+	var GETTime time.Duration
+	err := task.Run(o.ctx, func() error {
+		startTime := time.Now()
+		probeURL := "https://www.google.com/generate_204"
+		if o.config.ProbeUrl != "" {
+			probeURL = o.config.ProbeUrl
+		}
+		response, err := httpClient.Get(probeURL)
+		if err != nil {
+			return newError("outbound failed to relay connection").Base(err)
+		}
+		if response.Body != nil {
+			response.Body.Close()
+		}
+		endTime := time.Now()
+		GETTime = endTime.Sub(startTime)
+		return nil
+	})
+	if err != nil {
+		fullerr := newError("underlying connection failed").Base(errorCollectorForRequest.UnderlyingError())
+		fullerr = newError("with outbound handler report").Base(fullerr)
+		fullerr = newError("GET request failed:", err).Base(fullerr)
+		fullerr = newError("the outbound ", outbound, " is dead:").Base(fullerr)
+		fullerr = fullerr.AtInfo()
+		fullerr.WriteToLog()
+		return ProbeResult{Alive: false, LastErrorReason: fullerr.Error()}
+	}
+	newError("the outbound ", outbound, " is alive:", GETTime.Seconds()).AtInfo().WriteToLog()
+	return ProbeResult{Alive: true, Delay: GETTime.Milliseconds()}
+}
+
+func (o *Observer) updateStatusForResult(outbound string, result *ProbeResult) {
+	o.statusLock.Lock()
+	defer o.statusLock.Unlock()
+	var status *OutboundStatus
+	if location := o.findStatusLocationLockHolderOnly(outbound); location != -1 {
+		status = o.status[location]
+	} else {
+		status = &OutboundStatus{}
+		o.status = append(o.status, status)
+	}
+
+	status.LastTryTime = time.Now().Unix()
+	status.OutboundTag = outbound
+	status.Alive = result.Alive
+	if result.Alive {
+		status.Delay = result.Delay
+		status.LastSeenTime = status.LastTryTime
+		status.LastErrorReason = ""
+	} else {
+		status.LastErrorReason = result.LastErrorReason
+		status.Delay = 99999999
+	}
+}
+
+func (o *Observer) findStatusLocationLockHolderOnly(outbound string) int {
+	for i, v := range o.status {
+		if v.OutboundTag == outbound {
+			return i
+		}
+	}
+	return -1
+}
+
+func New(ctx context.Context, config *Config) (*Observer, error) {
+	var outboundManager outbound.Manager
+	err := core.RequireFeatures(ctx, func(om outbound.Manager) {
+		outboundManager = om
+	})
+	if err != nil {
+		return nil, newError("Cannot get depended features").Base(err)
+	}
+	return &Observer{
+		config: config,
+		ctx:    ctx,
+		ohm:    outboundManager,
+	}, nil
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return New(ctx, config.(*Config))
+	}))
+}

app/proxyman/command/command.go

@@ -3,13 +3,12 @@ package command
 import (
 	"context"
 
-	grpc "google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/inbound"
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/proxy"
+	grpc "google.golang.org/grpc"
 )
 
 // InboundOperation is the interface for operations that applies to inbound handlers.

app/proxyman/command/command_grpc.pb.go

@@ -1,4 +1,8 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.18.0
+// source: app/proxyman/command/command.proto
 
 package command
 

app/proxyman/config.pb.go

@@ -238,8 +238,10 @@ type SniffingConfig struct {
 	DestinationOverride []string `protobuf:"bytes,2,rep,name=destination_override,json=destinationOverride,proto3" json:"destination_override,omitempty"`
 	DomainsExcluded     []string `protobuf:"bytes,3,rep,name=domains_excluded,json=domainsExcluded,proto3" json:"domains_excluded,omitempty"`
 	// Whether should only try to sniff metadata without waiting for client input.
-	// Can be used to support SMTP like protocol where server send the first message.
+	// Can be used to support SMTP like protocol where server send the first
+	// message.
 	MetadataOnly bool `protobuf:"varint,4,opt,name=metadata_only,json=metadataOnly,proto3" json:"metadata_only,omitempty"`
+	RouteOnly    bool `protobuf:"varint,5,opt,name=route_only,json=routeOnly,proto3" json:"route_only,omitempty"`
 }
 
 func (x *SniffingConfig) Reset() {
@@ -302,13 +304,20 @@ func (x *SniffingConfig) GetMetadataOnly() bool {
 	return false
 }
 
+func (x *SniffingConfig) GetRouteOnly() bool {
+	if x != nil {
+		return x.RouteOnly
+	}
+	return false
+}
+
 type ReceiverConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// PortRange specifies the ports which the Receiver should listen on.
+	// PortList specifies the ports which the Receiver should listen on.
-	PortRange *net.PortRange `protobuf:"bytes,1,opt,name=port_range,json=portRange,proto3" json:"port_range,omitempty"`
+	PortList *net.PortList `protobuf:"bytes,1,opt,name=port_list,json=portList,proto3" json:"port_list,omitempty"`
 	// Listen specifies the IP address that the Receiver should listen on.
 	Listen                     *net.IPOrDomain        `protobuf:"bytes,2,opt,name=listen,proto3" json:"listen,omitempty"`
 	AllocationStrategy         *AllocationStrategy    `protobuf:"bytes,3,opt,name=allocation_strategy,json=allocationStrategy,proto3" json:"allocation_strategy,omitempty"`
@@ -354,9 +363,9 @@ func (*ReceiverConfig) Descriptor() ([]byte, []int) {
 	return file_app_proxyman_config_proto_rawDescGZIP(), []int{3}
 }
 
-func (x *ReceiverConfig) GetPortRange() *net.PortRange {
+func (x *ReceiverConfig) GetPortList() *net.PortList {
 	if x != nil {
-		return x.PortRange
+		return x.PortList
 	}
 	return nil
 }
@@ -769,7 +778,7 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
 	0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x22, 0x2c, 0x0a, 0x04, 0x54, 0x79, 0x70, 0x65, 0x12,
 	0x0a, 0x0a, 0x06, 0x41, 0x6c, 0x77, 0x61, 0x79, 0x73, 0x10, 0x00, 0x12, 0x0a, 0x0a, 0x06, 0x52,
 	0x61, 0x6e, 0x64, 0x6f, 0x6d, 0x10, 0x01, 0x12, 0x0c, 0x0a, 0x08, 0x45, 0x78, 0x74, 0x65, 0x72,
-	0x6e, 0x61, 0x6c, 0x10, 0x02, 0x22, 0xad, 0x01, 0x0a, 0x0e, 0x53, 0x6e, 0x69, 0x66, 0x66, 0x69,
+	0x6e, 0x61, 0x6c, 0x10, 0x02, 0x22, 0xcc, 0x01, 0x0a, 0x0e, 0x53, 0x6e, 0x69, 0x66, 0x66, 0x69,
 	0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x18, 0x0a, 0x07, 0x65, 0x6e, 0x61, 0x62,
 	0x6c, 0x65, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c,
 	0x65, 0x64, 0x12, 0x31, 0x0a, 0x14, 0x64, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x61, 0x74, 0x69, 0x6f,
@@ -780,86 +789,88 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
 	0x0f, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x73, 0x45, 0x78, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x64,
 	0x12, 0x23, 0x0a, 0x0d, 0x6d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0x5f, 0x6f, 0x6e, 0x6c,
 	0x79, 0x18, 0x04, 0x20, 0x01, 0x28, 0x08, 0x52, 0x0c, 0x6d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74,
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+	0x61, 0x4f, 0x6e, 0x6c, 0x79, 0x12, 0x1d, 0x0a, 0x0a, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x5f, 0x6f,
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+	0x4d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66,
+	0x69, 0x67, 0x12, 0x18, 0x0a, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x18, 0x01, 0x20,
+	0x01, 0x28, 0x08, 0x52, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x12, 0x20, 0x0a, 0x0b,
+	0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x18, 0x02, 0x20, 0x01, 0x28,
+	0x0d, 0x52, 0x0b, 0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x2a, 0x23,
+	0x0a, 0x0e, 0x4b, 0x6e, 0x6f, 0x77, 0x6e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x73,
+	0x12, 0x08, 0x0a, 0x04, 0x48, 0x54, 0x54, 0x50, 0x10, 0x00, 0x12, 0x07, 0x0a, 0x03, 0x54, 0x4c,
+	0x53, 0x10, 0x01, 0x42, 0x55, 0x0a, 0x15, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,
+	0x61, 0x70, 0x70, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x50, 0x01, 0x5a, 0x26,
+	0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f,
+	0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f, 0x70, 0x72,
+	0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0xaa, 0x02, 0x11, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70,
+	0x70, 0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
@@ -889,7 +900,7 @@ var file_app_proxyman_config_proto_goTypes = []interface{}{
 	(*MultiplexingConfig)(nil),                               // 9: xray.app.proxyman.MultiplexingConfig
 	(*AllocationStrategy_AllocationStrategyConcurrency)(nil), // 10: xray.app.proxyman.AllocationStrategy.AllocationStrategyConcurrency
 	(*AllocationStrategy_AllocationStrategyRefresh)(nil),     // 11: xray.app.proxyman.AllocationStrategy.AllocationStrategyRefresh
-	(*net.PortRange)(nil),                                    // 12: xray.common.net.PortRange
+	(*net.PortList)(nil),                                     // 12: xray.common.net.PortList
 	(*net.IPOrDomain)(nil),                                   // 13: xray.common.net.IPOrDomain
 	(*internet.StreamConfig)(nil),                            // 14: xray.transport.internet.StreamConfig
 	(*serial.TypedMessage)(nil),                              // 15: xray.common.serial.TypedMessage
@@ -899,7 +910,7 @@ var file_app_proxyman_config_proto_depIdxs = []int32{
 	1,  // 0: xray.app.proxyman.AllocationStrategy.type:type_name -> xray.app.proxyman.AllocationStrategy.Type
 	10, // 1: xray.app.proxyman.AllocationStrategy.concurrency:type_name -> xray.app.proxyman.AllocationStrategy.AllocationStrategyConcurrency
 	11, // 2: xray.app.proxyman.AllocationStrategy.refresh:type_name -> xray.app.proxyman.AllocationStrategy.AllocationStrategyRefresh
-	12, // 3: xray.app.proxyman.ReceiverConfig.port_range:type_name -> xray.common.net.PortRange
+	12, // 3: xray.app.proxyman.ReceiverConfig.port_list:type_name -> xray.common.net.PortList
 	13, // 4: xray.app.proxyman.ReceiverConfig.listen:type_name -> xray.common.net.IPOrDomain
 	3,  // 5: xray.app.proxyman.ReceiverConfig.allocation_strategy:type_name -> xray.app.proxyman.AllocationStrategy
 	14, // 6: xray.app.proxyman.ReceiverConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig

app/proxyman/config.proto

@@ -27,17 +27,13 @@ message AllocationStrategy {
 
   Type type = 1;
 
-  message AllocationStrategyConcurrency {
+  message AllocationStrategyConcurrency { uint32 value = 1; }
-    uint32 value = 1;
-  }
 
   // Number of handlers (ports) running in parallel.
   // Default value is 3 if unset.
   AllocationStrategyConcurrency concurrency = 2;
 
-  message AllocationStrategyRefresh {
+  message AllocationStrategyRefresh { uint32 value = 1; }
-    uint32 value = 1;
-  }
 
   // Number of minutes before a handler is regenerated.
   // Default value is 5 if unset.
@@ -57,15 +53,18 @@ message SniffingConfig {
   // Supported values are "http", "tls", "fakedns".
   repeated string destination_override = 2;
   repeated string domains_excluded = 3;
-  
+
   // Whether should only try to sniff metadata without waiting for client input.
-  // Can be used to support SMTP like protocol where server send the first message.
+  // Can be used to support SMTP like protocol where server send the first
+  // message.
   bool metadata_only = 4;
+
+  bool route_only = 5;
 }
 
 message ReceiverConfig {
-  // PortRange specifies the ports which the Receiver should listen on.
+  // PortList specifies the ports which the Receiver should listen on.
-  xray.common.net.PortRange port_range = 1;
+  xray.common.net.PortList port_list = 1;
   // Listen specifies the IP address that the Receiver should listen on.
   xray.common.net.IPOrDomain listen = 2;
   AllocationStrategy allocation_strategy = 3;
@@ -74,7 +73,7 @@ message ReceiverConfig {
   reserved 6;
   // Override domains for the given protocol.
   // Deprecated. Use sniffing_settings.
-  repeated KnownProtocols domain_override = 7 [deprecated = true];
+  repeated KnownProtocols domain_override = 7 [ deprecated = true ];
   SniffingConfig sniffing_settings = 8;
 }
 

app/proxyman/inbound/always.go

@@ -67,7 +67,7 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 	uplinkCounter, downlinkCounter := getStatCounter(core.MustFromContext(ctx), tag)
 
 	nl := p.Network()
-	pr := receiverConfig.PortRange
+	pl := receiverConfig.PortList
 	address := receiverConfig.Listen.AsAddress()
 	if address == nil {
 		address = net.AnyIP
@@ -87,7 +87,7 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 		}
 		mss.SocketSettings.ReceiveOriginalDestAddress = true
 	}
-	if pr == nil {
+	if pl == nil {
 		if net.HasNetwork(nl, net.Network_UNIX) {
 			newError("creating unix domain socket worker on ", address).AtDebug().WriteToLog()
 
@@ -105,41 +105,43 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 			h.workers = append(h.workers, worker)
 		}
 	}
-	if pr != nil {
+	if pl != nil {
-		for port := pr.From; port <= pr.To; port++ {
+		for _, pr := range pl.Range {
-			if net.HasNetwork(nl, net.Network_TCP) {
+			for port := pr.From; port <= pr.To; port++ {
-				newError("creating stream worker on ", address, ":", port).AtDebug().WriteToLog()
+				if net.HasNetwork(nl, net.Network_TCP) {
+					newError("creating stream worker on ", address, ":", port).AtDebug().WriteToLog()
 
-				worker := &tcpWorker{
+					worker := &tcpWorker{
-					address:         address,
+						address:         address,
-					port:            net.Port(port),
+						port:            net.Port(port),
-					proxy:           p,
+						proxy:           p,
-					stream:          mss,
+						stream:          mss,
-					recvOrigDest:    receiverConfig.ReceiveOriginalDestination,
+						recvOrigDest:    receiverConfig.ReceiveOriginalDestination,
-					tag:             tag,
+						tag:             tag,
-					dispatcher:      h.mux,
+						dispatcher:      h.mux,
-					sniffingConfig:  receiverConfig.GetEffectiveSniffingSettings(),
+						sniffingConfig:  receiverConfig.GetEffectiveSniffingSettings(),
-					uplinkCounter:   uplinkCounter,
+						uplinkCounter:   uplinkCounter,
-					downlinkCounter: downlinkCounter,
+						downlinkCounter: downlinkCounter,
-					ctx:             ctx,
+						ctx:             ctx,
+					}
+					h.workers = append(h.workers, worker)
 				}
-				h.workers = append(h.workers, worker)
-			}
 
-			if net.HasNetwork(nl, net.Network_UDP) {
+				if net.HasNetwork(nl, net.Network_UDP) {
-				worker := &udpWorker{
+					worker := &udpWorker{
-					tag:             tag,
+						tag:             tag,
-					proxy:           p,
+						proxy:           p,
-					address:         address,
+						address:         address,
-					port:            net.Port(port),
+						port:            net.Port(port),
-					dispatcher:      h.mux,
+						dispatcher:      h.mux,
-					sniffingConfig:  receiverConfig.GetEffectiveSniffingSettings(),
+						sniffingConfig:  receiverConfig.GetEffectiveSniffingSettings(),
-					uplinkCounter:   uplinkCounter,
+						uplinkCounter:   uplinkCounter,
-					downlinkCounter: downlinkCounter,
+						downlinkCounter: downlinkCounter,
-					stream:          mss,
+						stream:          mss,
-					ctx:             ctx,
+						ctx:             ctx,
+					}
+					h.workers = append(h.workers, worker)
 				}
-				h.workers = append(h.workers, worker)
 			}
 		}
 	}

app/proxyman/inbound/dynamic.go

@@ -69,15 +69,18 @@ func NewDynamicInboundHandler(ctx context.Context, tag string, receiverConfig *p
 }
 
 func (h *DynamicInboundHandler) allocatePort() net.Port {
-	from := int(h.receiverConfig.PortRange.From)
+	allPorts := []int32{}
-	delta := int(h.receiverConfig.PortRange.To) - from + 1
+	for _, pr := range h.receiverConfig.PortList.Range {
-
+		for i := pr.From; i <= pr.To; i++ {
+			allPorts = append(allPorts, int32(i))
+		}
+	}
 	h.portMutex.Lock()
 	defer h.portMutex.Unlock()
 
 	for {
-		r := dice.Roll(delta)
+		r := dice.Roll(len(allPorts))
-		port := net.Port(from + r)
+		port := net.Port(allPorts[r])
 		_, used := h.portsInUse[port]
 		if !used {
 			h.portsInUse[port] = true

app/proxyman/inbound/worker.go

@@ -6,8 +6,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/xtls/xray-core/transport/internet/stat"
-
 	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
@@ -20,6 +18,7 @@ import (
 	"github.com/xtls/xray-core/features/stats"
 	"github.com/xtls/xray-core/proxy"
 	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/stat"
 	"github.com/xtls/xray-core/transport/internet/tcp"
 	"github.com/xtls/xray-core/transport/internet/udp"
 	"github.com/xtls/xray-core/transport/pipe"
@@ -101,6 +100,7 @@ func (w *tcpWorker) callback(conn stat.Connection) {
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
 		content.SniffingRequest.ExcludeForDomain = w.sniffingConfig.DomainsExcluded
 		content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
+		content.SniffingRequest.RouteOnly = w.sniffingConfig.RouteOnly
 	}
 	ctx = session.ContextWithContent(ctx, content)
 
@@ -108,9 +108,7 @@ func (w *tcpWorker) callback(conn stat.Connection) {
 		newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 	cancel()
-	if err := conn.Close(); err != nil {
+	conn.Close()
-		newError("failed to close connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
-	}
 }
 
 func (w *tcpWorker) Proxy() proxy.Inbound {
@@ -160,6 +158,11 @@ type udpConn struct {
 	done             *done.Instance
 	uplink           stats.Counter
 	downlink         stats.Counter
+	inactive         bool
+}
+
+func (c *udpConn) setInactive() {
+	c.inactive = true
 }
 
 func (c *udpConn) updateActivity() {
@@ -320,13 +323,18 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
 				content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 				content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
 				content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
+				content.SniffingRequest.RouteOnly = w.sniffingConfig.RouteOnly
 			}
 			ctx = session.ContextWithContent(ctx, content)
 			if err := w.proxy.Process(ctx, net.Network_UDP, conn, w.dispatcher); err != nil {
 				newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			}
 			conn.Close()
-			w.removeConn(id)
+			// conn not removed by checker TODO may be lock worker here is better
+			if !conn.inactive {
+				conn.setInactive()
+				w.removeConn(id)
+			}
 		}()
 	}
 }
@@ -354,8 +362,11 @@ func (w *udpWorker) clean() error {
 	}
 
 	for addr, conn := range w.activeConn {
-		if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 300 {
+		if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 5*60 { // TODO Timeout too small
-			delete(w.activeConn, addr)
+			if !conn.inactive {
+				conn.setInactive()
+				delete(w.activeConn, addr)
+			}
 			conn.Close()
 		}
 	}
@@ -463,6 +474,7 @@ func (w *dsWorker) callback(conn stat.Connection) {
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
 		content.SniffingRequest.ExcludeForDomain = w.sniffingConfig.DomainsExcluded
 		content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
+		content.SniffingRequest.RouteOnly = w.sniffingConfig.RouteOnly
 	}
 	ctx = session.ContextWithContent(ctx, content)
 

app/proxyman/outbound/handler.go

@@ -2,8 +2,9 @@ package outbound
 
 import (
 	"context"
-
+	"errors"
-	"github.com/xtls/xray-core/transport/internet/stat"
+	"io"
+	"os"
 
 	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/common"
@@ -18,6 +19,7 @@ import (
 	"github.com/xtls/xray-core/proxy"
 	"github.com/xtls/xray-core/transport"
 	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/stat"
 	"github.com/xtls/xray-core/transport/internet/tls"
 	"github.com/xtls/xray-core/transport/pipe"
 )
@@ -59,7 +61,7 @@ type Handler struct {
 	downlinkCounter stats.Counter
 }
 
-// NewHandler create a new Handler based on the given configuration.
+// NewHandler creates a new Handler based on the given configuration.
 func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbound.Handler, error) {
 	v := core.MustFromContext(ctx)
 	uplinkCounter, downlinkCounter := getStatCounter(v, config.Tag)
@@ -136,13 +138,23 @@ func (h *Handler) Tag() string {
 func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
 	if h.mux != nil && (h.mux.Enabled || session.MuxPreferedFromContext(ctx)) {
 		if err := h.mux.Dispatch(ctx, link); err != nil {
-			newError("failed to process mux outbound traffic").Base(err).WriteToLog(session.ExportIDToError(ctx))
+			err := newError("failed to process mux outbound traffic").Base(err)
+			session.SubmitOutboundErrorToOriginator(ctx, err)
+			err.WriteToLog(session.ExportIDToError(ctx))
 			common.Interrupt(link.Writer)
 		}
 	} else {
-		if err := h.proxy.Process(ctx, link, h); err != nil {
+		err := h.proxy.Process(ctx, link, h)
+		if err != nil {
+			if errors.Is(err, io.EOF) || errors.Is(err, io.ErrClosedPipe) || errors.Is(err, context.Canceled) {
+				err = nil
+			}
+		}
+		if err != nil {
 			// Ensure outbound ray is properly closed.
-			newError("failed to process outbound traffic").Base(err).WriteToLog(session.ExportIDToError(ctx))
+			err := newError("failed to process outbound traffic").Base(err)
+			session.SubmitOutboundErrorToOriginator(ctx, err)
+			err.WriteToLog(session.ExportIDToError(ctx))
 			common.Interrupt(link.Writer)
 		} else {
 			common.Must(common.Close(link.Writer))
@@ -199,6 +211,10 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (stat.Connecti
 		}
 	}
 
+	if conn, err := h.getUoTConnection(ctx, dest); err != os.ErrInvalid {
+		return conn, err
+	}
+
 	conn, err := internet.Dial(ctx, dest, h.streamSettings)
 	return h.getStatCouterConnection(conn), err
 }

app/proxyman/outbound/handler_test.go

@@ -4,8 +4,6 @@ import (
 	"context"
 	"testing"
 
-	"github.com/xtls/xray-core/transport/internet/stat"
-
 	"github.com/xtls/xray-core/app/policy"
 	. "github.com/xtls/xray-core/app/proxyman/outbound"
 	"github.com/xtls/xray-core/app/stats"
@@ -14,6 +12,7 @@ import (
 	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/proxy/freedom"
+	"github.com/xtls/xray-core/transport/internet/stat"
 )
 
 func TestInterfaces(t *testing.T) {

app/proxyman/outbound/uot.go

@@ -0,0 +1,25 @@
+//go:build go1.18
+
+package outbound
+
+import (
+	"context"
+	"os"
+
+	"github.com/sagernet/sing/common/uot"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/stat"
+)
+
+func (h *Handler) getUoTConnection(ctx context.Context, dest net.Destination) (stat.Connection, error) {
+	if !dest.Address.Family().IsDomain() || dest.Address.Domain() != uot.UOTMagicAddress {
+		return nil, os.ErrInvalid
+	}
+	packetConn, err := internet.ListenSystemPacket(ctx, &net.UDPAddr{IP: net.AnyIP.IP(), Port: 0}, h.streamSettings.SocketSettings)
+	if err != nil {
+		return nil, newError("unable to listen socket").Base(err)
+	}
+	conn := uot.NewServerConn(packetConn)
+	return h.getStatCouterConnection(conn), nil
+}

app/proxyman/outbound/uot_stub.go

@@ -0,0 +1,15 @@
+//go:build !go1.18
+
+package outbound
+
+import (
+	"context"
+	"os"
+
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/transport/internet/stat"
+)
+
+func (h *Handler) getUoTConnection(ctx context.Context, dest net.Destination) (stat.Connection, error) {
+	return nil, os.ErrInvalid
+}

app/reverse/bridge.go

@@ -5,7 +5,6 @@ import (
 	"time"
 
 	"github.com/golang/protobuf/proto"
-
 	"github.com/xtls/xray-core/common/mux"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
@@ -147,7 +146,7 @@ func (w *BridgeWorker) Connections() uint32 {
 	return w.worker.ActiveConnections()
 }
 
-func (w *BridgeWorker) handleInternalConn(link transport.Link) {
+func (w *BridgeWorker) handleInternalConn(link *transport.Link) {
 	go func() {
 		reader := link.Reader
 		for {
@@ -181,7 +180,7 @@ func (w *BridgeWorker) Dispatch(ctx context.Context, dest net.Destination) (*tra
 	uplinkReader, uplinkWriter := pipe.New(opt...)
 	downlinkReader, downlinkWriter := pipe.New(opt...)
 
-	w.handleInternalConn(transport.Link{
+	w.handleInternalConn(&transport.Link{
 		Reader: downlinkReader,
 		Writer: uplinkWriter,
 	})
@@ -191,3 +190,16 @@ func (w *BridgeWorker) Dispatch(ctx context.Context, dest net.Destination) (*tra
 		Writer: downlinkWriter,
 	}, nil
 }
+
+func (w *BridgeWorker) DispatchLink(ctx context.Context, dest net.Destination, link *transport.Link) error {
+	if !isInternalDomain(dest) {
+		ctx = session.ContextWithInbound(ctx, &session.Inbound{
+			Tag: w.tag,
+		})
+		return w.dispatcher.DispatchLink(ctx, dest, link)
+	}
+
+	w.handleInternalConn(link)
+
+	return nil
+}

app/reverse/portal.go

@@ -6,7 +6,6 @@ import (
 	"time"
 
 	"github.com/golang/protobuf/proto"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/mux"

app/reverse/reverse.go

@@ -14,7 +14,7 @@ import (
 )
 
 const (
-	internalDomain = "reverse.internal.example.com"
+	internalDomain = "reverse.internal.v2fly.org" // make reverse proxy compatible with v2fly
 )
 
 func isDomain(dest net.Destination, domain string) bool {

app/router/balancing.go

@@ -1,7 +1,10 @@
 package router
 
 import (
+	"context"
+
 	"github.com/xtls/xray-core/common/dice"
+	"github.com/xtls/xray-core/features/extension"
 	"github.com/xtls/xray-core/features/outbound"
 )
 
@@ -41,3 +44,9 @@ func (b *Balancer) PickOutbound() (string, error) {
 	}
 	return tag, nil
 }
+
+func (b *Balancer) InjectContext(ctx context.Context) {
+	if contextReceiver, ok := b.strategy.(extension.ContextReceiver); ok {
+		contextReceiver.InjectContext(ctx)
+	}
+}

app/router/command/command.go

@@ -6,12 +6,11 @@ import (
 	"context"
 	"time"
 
-	"google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/features/stats"
+	"google.golang.org/grpc"
 )
 
 // routingServer is an implementation of RoutingService.

app/router/command/command_grpc.pb.go

@@ -1,4 +1,8 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.18.0
+// source: app/router/command/command.proto
 
 package command
 

app/router/command/command_test.go

@@ -8,9 +8,6 @@ import (
 	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/test/bufconn"
-
 	"github.com/xtls/xray-core/app/router"
 	. "github.com/xtls/xray-core/app/router/command"
 	"github.com/xtls/xray-core/app/stats"
@@ -18,6 +15,8 @@ import (
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/testing/mocks"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/test/bufconn"
 )
 
 func TestServiceSubscribeRoutingStats(t *testing.T) {
@@ -284,7 +283,7 @@ func TestSerivceTestRoute(t *testing.T) {
 	r := new(router.Router)
 	mockCtl := gomock.NewController(t)
 	defer mockCtl.Finish()
-	common.Must(r.Init(&router.Config{
+	common.Must(r.Init(context.TODO(), &router.Config{
 		Rule: []*router.RoutingRule{
 			{
 				InboundTag: []string{"in"},

app/router/condition.go

@@ -3,12 +3,11 @@ package router
 import (
 	"strings"
 
-	"go.starlark.net/starlark"
-	"go.starlark.net/syntax"
-
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/strmatcher"
 	"github.com/xtls/xray-core/features/routing"
+	"go.starlark.net/starlark"
+	"go.starlark.net/syntax"
 )
 
 type Condition interface {

app/router/condition_geoip.go

@@ -13,11 +13,12 @@ type ipv6 struct {
 }
 
 type GeoIPMatcher struct {
-	countryCode string
+	countryCode  string
-	ip4         []uint32
+	reverseMatch bool
-	prefix4     []uint8
+	ip4          []uint32
-	ip6         []ipv6
+	prefix4      []uint8
-	prefix6     []uint8
+	ip6          []ipv6
+	prefix6      []uint8
 }
 
 func normalize4(ip uint32, prefix uint8) uint32 {
@@ -58,7 +59,7 @@ func (m *GeoIPMatcher) Init(cidrs []*CIDR) error {
 	m.ip6 = make([]ipv6, 0, ip6Count)
 	m.prefix6 = make([]uint8, 0, ip6Count)
 
-	for _, cidr := range cidrs {
+	for _, cidr := range cidrList {
 		ip := cidr.Ip
 		prefix := uint8(cidr.Prefix)
 		switch len(ip) {
@@ -80,6 +81,10 @@ func (m *GeoIPMatcher) Init(cidrs []*CIDR) error {
 	return nil
 }
 
+func (m *GeoIPMatcher) SetReverseMatch(isReverseMatch bool) {
+	m.reverseMatch = isReverseMatch
+}
+
 func (m *GeoIPMatcher) match4(ip uint32) bool {
 	if len(m.ip4) == 0 {
 		return false
@@ -147,8 +152,17 @@ func (m *GeoIPMatcher) match6(ip ipv6) bool {
 func (m *GeoIPMatcher) Match(ip net.IP) bool {
 	switch len(ip) {
 	case 4:
+		if m.reverseMatch {
+			return !m.match4(binary.BigEndian.Uint32(ip))
+		}
 		return m.match4(binary.BigEndian.Uint32(ip))
 	case 16:
+		if m.reverseMatch {
+			return !m.match6(ipv6{
+				a: binary.BigEndian.Uint64(ip[0:8]),
+				b: binary.BigEndian.Uint64(ip[8:16]),
+			})
+		}
 		return m.match6(ipv6{
 			a: binary.BigEndian.Uint64(ip[0:8]),
 			b: binary.BigEndian.Uint64(ip[8:16]),
@@ -168,14 +182,15 @@ type GeoIPMatcherContainer struct {
 func (c *GeoIPMatcherContainer) Add(geoip *GeoIP) (*GeoIPMatcher, error) {
 	if len(geoip.CountryCode) > 0 {
 		for _, m := range c.matchers {
-			if m.countryCode == geoip.CountryCode {
+			if m.countryCode == geoip.CountryCode && m.reverseMatch == geoip.ReverseMatch {
 				return m, nil
 			}
 		}
 	}
 
 	m := &GeoIPMatcher{
-		countryCode: geoip.CountryCode,
+		countryCode:  geoip.CountryCode,
+		reverseMatch: geoip.ReverseMatch,
 	}
 	if err := m.Init(geoip.Cidr); err != nil {
 		return nil, err

app/router/condition_geoip_test.go

@@ -6,7 +6,6 @@ import (
 	"testing"
 
 	"github.com/golang/protobuf/proto"
-
 	"github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
@@ -125,6 +124,42 @@ func TestGeoIPMatcher(t *testing.T) {
 	}
 }
 
+func TestGeoIPReverseMatcher(t *testing.T) {
+	cidrList := router.CIDRList{
+		{Ip: []byte{8, 8, 8, 8}, Prefix: 32},
+		{Ip: []byte{91, 108, 4, 0}, Prefix: 16},
+	}
+	matcher := &router.GeoIPMatcher{}
+	matcher.SetReverseMatch(true) // Reverse match
+	common.Must(matcher.Init(cidrList))
+
+	testCases := []struct {
+		Input  string
+		Output bool
+	}{
+		{
+			Input:  "8.8.8.8",
+			Output: false,
+		},
+		{
+			Input:  "2001:cdba::3257:9652",
+			Output: true,
+		},
+		{
+			Input:  "91.108.255.254",
+			Output: false,
+		},
+	}
+
+	for _, testCase := range testCases {
+		ip := net.ParseAddress(testCase.Input).IP()
+		actual := matcher.Match(ip)
+		if actual != testCase.Output {
+			t.Error("expect input", testCase.Input, "to be", testCase.Output, ", but actually", actual)
+		}
+	}
+}
+
 func TestGeoIPMatcher4CN(t *testing.T) {
 	ips, err := loadGeoIP("CN")
 	common.Must(err)

app/router/condition_test.go

@@ -7,7 +7,6 @@ import (
 	"testing"
 
 	"github.com/golang/protobuf/proto"
-
 	. "github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"

app/router/config.go

@@ -158,9 +158,21 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 }
 
 func (br *BalancingRule) Build(ohm outbound.Manager) (*Balancer, error) {
-	return &Balancer{
+	switch br.Strategy {
-		selectors: br.OutboundSelector,
+	case "leastPing":
-		strategy:  &RandomStrategy{},
+		return &Balancer{
-		ohm:       ohm,
+			selectors: br.OutboundSelector,
-	}, nil
+			strategy:  &LeastPingStrategy{},
+			ohm:       ohm,
+		}, nil
+	case "random":
+		fallthrough
+	default:
+		return &Balancer{
+			selectors: br.OutboundSelector,
+			strategy:  &RandomStrategy{},
+			ohm:       ohm,
+		}, nil
+
+	}
 }

app/router/config.pb.go

@@ -264,8 +264,9 @@ type GeoIP struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	CountryCode string  `protobuf:"bytes,1,opt,name=country_code,json=countryCode,proto3" json:"country_code,omitempty"`
+	CountryCode  string  `protobuf:"bytes,1,opt,name=country_code,json=countryCode,proto3" json:"country_code,omitempty"`
-	Cidr        []*CIDR `protobuf:"bytes,2,rep,name=cidr,proto3" json:"cidr,omitempty"`
+	Cidr         []*CIDR `protobuf:"bytes,2,rep,name=cidr,proto3" json:"cidr,omitempty"`
+	ReverseMatch bool    `protobuf:"varint,3,opt,name=reverse_match,json=reverseMatch,proto3" json:"reverse_match,omitempty"`
 }
 
 func (x *GeoIP) Reset() {
@@ -314,6 +315,13 @@ func (x *GeoIP) GetCidr() []*CIDR {
 	return nil
 }
 
+func (x *GeoIP) GetReverseMatch() bool {
+	if x != nil {
+		return x.ReverseMatch
+	}
+	return false
+}
+
 type GeoIPList struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -700,6 +708,7 @@ type BalancingRule struct {
 
 	Tag              string   `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
 	OutboundSelector []string `protobuf:"bytes,2,rep,name=outbound_selector,json=outboundSelector,proto3" json:"outbound_selector,omitempty"`
+	Strategy         string   `protobuf:"bytes,3,opt,name=strategy,proto3" json:"strategy,omitempty"`
 }
 
 func (x *BalancingRule) Reset() {
@@ -748,6 +757,13 @@ func (x *BalancingRule) GetOutboundSelector() []string {
 	return nil
 }
 
+func (x *BalancingRule) GetStrategy() string {
+	if x != nil {
+		return x.Strategy
+	}
+	return ""
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -930,105 +946,110 @@ var file_app_router_config_proto_rawDesc = []byte{
 	0x03, 0x22, 0x2e, 0x0a, 0x04, 0x43, 0x49, 0x44, 0x52, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x70, 0x18,
 	0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x02, 0x69, 0x70, 0x12, 0x16, 0x0a, 0x06, 0x70, 0x72, 0x65,
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+	0x78, 0x22, 0x7a, 0x0a, 0x05, 0x47, 0x65, 0x6f, 0x49, 0x50, 0x12, 0x21, 0x0a, 0x0c, 0x63, 0x6f,
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+	0x72, 0x61, 0x74, 0x65, 0x67, 0x79, 0x12, 0x30, 0x0a, 0x04, 0x72, 0x75, 0x6c, 0x65, 0x18, 0x02,
-	0x5a, 0x24, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c,
+	0x20, 0x03, 0x28, 0x0b, 0x32, 0x1c, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e,
-	0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f,
+	0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x2e, 0x52, 0x6f, 0x75, 0x74, 0x69, 0x6e, 0x67, 0x52, 0x75,
-	0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0xaa, 0x02, 0x0f, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70,
+	0x6c, 0x65, 0x52, 0x04, 0x72, 0x75, 0x6c, 0x65, 0x12, 0x45, 0x0a, 0x0e, 0x62, 0x61, 0x6c, 0x61,
-	0x70, 0x2e, 0x52, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x6e, 0x63, 0x69, 0x6e, 0x67, 0x5f, 0x72, 0x75, 0x6c, 0x65, 0x18, 0x03, 0x20, 0x03, 0x28, 0x0b,
+	0x32, 0x1e, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x72, 0x6f, 0x75, 0x74,
+	0x65, 0x72, 0x2e, 0x42, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x69, 0x6e, 0x67, 0x52, 0x75, 0x6c, 0x65,
+	0x52, 0x0d, 0x62, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x69, 0x6e, 0x67, 0x52, 0x75, 0x6c, 0x65, 0x22,
+	0x47, 0x0a, 0x0e, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x53, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67,
+	0x79, 0x12, 0x08, 0x0a, 0x04, 0x41, 0x73, 0x49, 0x73, 0x10, 0x00, 0x12, 0x09, 0x0a, 0x05, 0x55,
+	0x73, 0x65, 0x49, 0x70, 0x10, 0x01, 0x12, 0x10, 0x0a, 0x0c, 0x49, 0x70, 0x49, 0x66, 0x4e, 0x6f,
+	0x6e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x10, 0x02, 0x12, 0x0e, 0x0a, 0x0a, 0x49, 0x70, 0x4f, 0x6e,
+	0x44, 0x65, 0x6d, 0x61, 0x6e, 0x64, 0x10, 0x03, 0x42, 0x4f, 0x0a, 0x13, 0x63, 0x6f, 0x6d, 0x2e,
+	0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x50,
+	0x01, 0x5a, 0x24, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74,
+	0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70, 0x70,
+	0x2f, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0xaa, 0x02, 0x0f, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41,
+	0x70, 0x70, 0x2e, 0x52, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x33,
 }
 
 var (

app/router/config.proto

@@ -54,6 +54,7 @@ message CIDR {
 message GeoIP {
   string country_code = 1;
   repeated CIDR cidr = 2;
+  bool reverse_match = 3;
 }
 
 message GeoIPList {
@@ -126,6 +127,7 @@ message RoutingRule {
 message BalancingRule {
   string tag = 1;
   repeated string outbound_selector = 2;
+  string strategy = 3;
 }
 
 message Config {

app/router/router.go

@@ -29,7 +29,7 @@ type Route struct {
 }
 
 // Init initializes the Router.
-func (r *Router) Init(config *Config, d dns.Client, ohm outbound.Manager) error {
+func (r *Router) Init(ctx context.Context, config *Config, d dns.Client, ohm outbound.Manager) error {
 	r.domainStrategy = config.DomainStrategy
 	r.dns = d
 
@@ -39,6 +39,7 @@ func (r *Router) Init(config *Config, d dns.Client, ohm outbound.Manager) error
 		if err != nil {
 			return err
 		}
+		balancer.InjectContext(ctx)
 		r.balancers[rule.Tag] = balancer
 	}
 
@@ -121,7 +122,7 @@ func (*Router) Close() error {
 	return nil
 }
 
-// Type implement common.HasType.
+// Type implements common.HasType.
 func (*Router) Type() interface{} {
 	return routing.RouterType()
 }
@@ -140,7 +141,7 @@ func init() {
 	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
 		r := new(Router)
 		if err := core.RequireFeatures(ctx, func(d dns.Client, ohm outbound.Manager) error {
-			return r.Init(config.(*Config), d, ohm)
+			return r.Init(ctx, config.(*Config), d, ohm)
 		}); err != nil {
 			return nil, err
 		}

app/router/router_test.go

@@ -4,14 +4,12 @@ import (
 	"context"
 	"testing"
 
-	"github.com/xtls/xray-core/features/dns"
-
 	"github.com/golang/mock/gomock"
-
 	. "github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/outbound"
 	routing_session "github.com/xtls/xray-core/features/routing/session"
 	"github.com/xtls/xray-core/testing/mocks"
@@ -42,7 +40,7 @@ func TestSimpleRouter(t *testing.T) {
 	mockHs := mocks.NewOutboundHandlerSelector(mockCtl)
 
 	r := new(Router)
-	common.Must(r.Init(config, mockDNS, &mockOutboundManager{
+	common.Must(r.Init(context.TODO(), config, mockDNS, &mockOutboundManager{
 		Manager:         mockOhm,
 		HandlerSelector: mockHs,
 	}))
@@ -83,7 +81,7 @@ func TestSimpleBalancer(t *testing.T) {
 	mockHs.EXPECT().Select(gomock.Eq([]string{"test-"})).Return([]string{"test"})
 
 	r := new(Router)
-	common.Must(r.Init(config, mockDNS, &mockOutboundManager{
+	common.Must(r.Init(context.TODO(), config, mockDNS, &mockOutboundManager{
 		Manager:         mockOhm,
 		HandlerSelector: mockHs,
 	}))
@@ -125,7 +123,7 @@ func TestIPOnDemand(t *testing.T) {
 	}).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
 
 	r := new(Router)
-	common.Must(r.Init(config, mockDNS, nil))
+	common.Must(r.Init(context.TODO(), config, mockDNS, nil))
 
 	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.DomainAddress("example.com"), 80)})
 	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))
@@ -164,7 +162,7 @@ func TestIPIfNonMatchDomain(t *testing.T) {
 	}).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
 
 	r := new(Router)
-	common.Must(r.Init(config, mockDNS, nil))
+	common.Must(r.Init(context.TODO(), config, mockDNS, nil))
 
 	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.DomainAddress("example.com"), 80)})
 	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))
@@ -198,7 +196,7 @@ func TestIPIfNonMatchIP(t *testing.T) {
 	mockDNS := mocks.NewDNSClient(mockCtl)
 
 	r := new(Router)
-	common.Must(r.Init(config, mockDNS, nil))
+	common.Must(r.Init(context.TODO(), config, mockDNS, nil))
 
 	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.LocalHostIP, 80)})
 	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))

app/router/strategy_leastping.go

@@ -0,0 +1,61 @@
+package router
+
+import (
+	"context"
+
+	"github.com/xtls/xray-core/app/observatory"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/extension"
+)
+
+type LeastPingStrategy struct {
+	ctx         context.Context
+	observatory extension.Observatory
+}
+
+func (l *LeastPingStrategy) InjectContext(ctx context.Context) {
+	l.ctx = ctx
+}
+
+func (l *LeastPingStrategy) PickOutbound(strings []string) string {
+	if l.observatory == nil {
+		common.Must(core.RequireFeatures(l.ctx, func(observatory extension.Observatory) error {
+			l.observatory = observatory
+			return nil
+		}))
+	}
+
+	observeReport, err := l.observatory.GetObservation(l.ctx)
+	if err != nil {
+		newError("cannot get observe report").Base(err).WriteToLog()
+		return ""
+	}
+	outboundsList := outboundList(strings)
+	if result, ok := observeReport.(*observatory.ObservationResult); ok {
+		status := result.Status
+		leastPing := int64(99999999)
+		selectedOutboundName := ""
+		for _, v := range status {
+			if outboundsList.contains(v.OutboundTag) && v.Alive && v.Delay < leastPing {
+				selectedOutboundName = v.OutboundTag
+				leastPing = v.Delay
+			}
+		}
+		return selectedOutboundName
+	}
+
+	// No way to understand observeReport
+	return ""
+}
+
+type outboundList []string
+
+func (o outboundList) contains(name string) bool {
+	for _, v := range o {
+		if v == name {
+			return true
+		}
+	}
+	return false
+}

app/stats/command/command.go

@@ -7,13 +7,12 @@ import (
 	"runtime"
 	"time"
 
-	grpc "google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/app/stats"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/strmatcher"
 	"github.com/xtls/xray-core/core"
 	feature_stats "github.com/xtls/xray-core/features/stats"
+	grpc "google.golang.org/grpc"
 )
 
 // statsServer is an implementation of StatsService.

app/stats/command/command_grpc.pb.go

@@ -1,4 +1,8 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.18.0
+// source: app/stats/command/command.proto
 
 package command
 

app/stats/command/command_test.go

@@ -6,7 +6,6 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
-
 	"github.com/xtls/xray-core/app/stats"
 	. "github.com/xtls/xray-core/app/stats/command"
 	"github.com/xtls/xray-core/common"

common/antireplay/antireplay.go

@@ -0,0 +1,6 @@
+package antireplay
+
+type GeneralizedReplayFilter interface {
+	Interval() int64
+	Check(sum []byte) bool
+}

common/antireplay/bloomring.go

@@ -0,0 +1,36 @@
+package antireplay
+
+import (
+	"sync"
+
+	ss_bloomring "github.com/v2fly/ss-bloomring"
+)
+
+type BloomRing struct {
+	*ss_bloomring.BloomRing
+	lock *sync.Mutex
+}
+
+func (b BloomRing) Interval() int64 {
+	return 9999999
+}
+
+func (b BloomRing) Check(sum []byte) bool {
+	b.lock.Lock()
+	defer b.lock.Unlock()
+	if b.Test(sum) {
+		return false
+	}
+	b.Add(sum)
+	return true
+}
+
+func NewBloomRing() BloomRing {
+	const (
+		DefaultSFCapacity = 1e6
+		// FalsePositiveRate
+		DefaultSFFPR  = 1e-6
+		DefaultSFSlot = 10
+	)
+	return BloomRing{ss_bloomring.NewBloomRing(DefaultSFSlot, DefaultSFCapacity, DefaultSFFPR), &sync.Mutex{}}
+}

common/antireplay/replayfilter.go

@@ -9,7 +9,7 @@ import (
 
 const replayFilterCapacity = 100000
 
-// ReplayFilter check for replay attacks.
+// ReplayFilter checks for replay attacks.
 type ReplayFilter struct {
 	lock     sync.Mutex
 	poolA    *cuckoo.Filter
@@ -31,7 +31,7 @@ func (filter *ReplayFilter) Interval() int64 {
 	return filter.interval
 }
 
-// Check determine if there are duplicate records.
+// Check determines if there are duplicate records.
 func (filter *ReplayFilter) Check(sum []byte) bool {
 	filter.lock.Lock()
 	defer filter.lock.Unlock()

common/buf/buffer.go

@@ -18,10 +18,11 @@ var pool = bytespool.GetPool(Size)
 // the buffer into an internal buffer pool, in order to recreate a buffer more
 // quickly.
 type Buffer struct {
-	v     []byte
+	v         []byte
-	start int32
+	start     int32
-	end   int32
+	end       int32
-	UDP   *net.Destination
+	unmanaged bool
+	UDP       *net.Destination
 }
 
 // New creates a Buffer with 0 length and 8K capacity.
@@ -38,6 +39,7 @@ func New() *Buffer {
 	}
 }
 
+// NewExisted creates a managed, standard size Buffer with an existed bytearray
 func NewExisted(b []byte) *Buffer {
 	if cap(b) < Size {
 		panic("Invalid buffer")
@@ -54,6 +56,15 @@ func NewExisted(b []byte) *Buffer {
 	}
 }
 
+// FromBytes creates a Buffer with an existed bytearray
+func FromBytes(b []byte) *Buffer {
+	return &Buffer{
+		v:         b,
+		end:       int32(len(b)),
+		unmanaged: true,
+	}
+}
+
 // StackNew creates a new Buffer object on stack.
 // This method is for buffers that is released in the same function.
 func StackNew() Buffer {
@@ -71,7 +82,7 @@ func StackNew() Buffer {
 
 // Release recycles the buffer into an internal buffer pool.
 func (b *Buffer) Release() {
-	if b == nil || b.v == nil {
+	if b == nil || b.v == nil || b.unmanaged {
 		return
 	}
 
@@ -212,6 +223,28 @@ func (b *Buffer) WriteString(s string) (int, error) {
 	return b.Write([]byte(s))
 }
 
+// ReadByte implements io.ByteReader
+func (b *Buffer) ReadByte() (byte, error) {
+	if b.start == b.end {
+		return 0, io.EOF
+	}
+
+	nb := b.v[b.start]
+	b.start++
+	return nb, nil
+}
+
+// ReadBytes implements bufio.Reader.ReadBytes
+func (b *Buffer) ReadBytes(length int32) ([]byte, error) {
+	if b.end-b.start < length {
+		return nil, io.EOF
+	}
+
+	nb := b.v[b.start : b.start+length]
+	b.start += length
+	return nb, nil
+}
+
 // Read implements io.Reader.Read().
 func (b *Buffer) Read(data []byte) (int, error) {
 	if b.Len() == 0 {

common/buf/buffer_test.go

@@ -6,7 +6,6 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-
 	"github.com/xtls/xray-core/common"
 	. "github.com/xtls/xray-core/common/buf"
 )

common/buf/copy.go

@@ -48,7 +48,7 @@ func (e readError) Error() string {
 	return e.error.Error()
 }
 
-func (e readError) Inner() error {
+func (e readError) Unwrap() error {
 	return e.error
 }
 
@@ -66,7 +66,7 @@ func (e writeError) Error() string {
 	return e.error.Error()
 }
 
-func (e writeError) Inner() error {
+func (e writeError) Unwrap() error {
 	return e.error
 }
 

common/buf/copy_test.go

@@ -6,7 +6,6 @@ import (
 	"testing"
 
 	"github.com/golang/mock/gomock"
-
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/testing/mocks"

common/buf/multi_buffer.go

@@ -53,7 +53,7 @@ func MergeBytes(dest MultiBuffer, src []byte) MultiBuffer {
 	return dest
 }
 
-// ReleaseMulti release all content of the MultiBuffer, and returns an empty MultiBuffer.
+// ReleaseMulti releases all content of the MultiBuffer, and returns an empty MultiBuffer.
 func ReleaseMulti(mb MultiBuffer) MultiBuffer {
 	for i := range mb {
 		mb[i].Release()
@@ -235,7 +235,7 @@ func (mb MultiBuffer) Len() int32 {
 	return size
 }
 
-// IsEmpty return true if the MultiBuffer has no content.
+// IsEmpty returns true if the MultiBuffer has no content.
 func (mb MultiBuffer) IsEmpty() bool {
 	for _, b := range mb {
 		if !b.IsEmpty() {
@@ -283,14 +283,14 @@ func (c *MultiBufferContainer) Write(b []byte) (int, error) {
 	return len(b), nil
 }
 
-// WriteMultiBuffer implement Writer.
+// WriteMultiBuffer implements Writer.
 func (c *MultiBufferContainer) WriteMultiBuffer(b MultiBuffer) error {
 	mb, _ := MergeMulti(c.MultiBuffer, b)
 	c.MultiBuffer = mb
 	return nil
 }
 
-// Close implement io.Closer.
+// Close implements io.Closer.
 func (c *MultiBufferContainer) Close() error {
 	c.MultiBuffer = ReleaseMulti(c.MultiBuffer)
 	return nil

common/buf/multi_buffer_test.go

@@ -8,7 +8,6 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-
 	"github.com/xtls/xray-core/common"
 	. "github.com/xtls/xray-core/common/buf"
 )

common/buf/readv_reader.go

@@ -7,9 +7,8 @@ import (
 	"io"
 	"syscall"
 
-	"github.com/xtls/xray-core/features/stats"
-
 	"github.com/xtls/xray-core/common/platform"
+	"github.com/xtls/xray-core/features/stats"
 )
 
 type allocStrategy struct {

common/buf/readv_test.go

@@ -9,12 +9,10 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-
-	"golang.org/x/sync/errgroup"
-
 	"github.com/xtls/xray-core/common"
 	. "github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/testing/servers/tcp"
+	"golang.org/x/sync/errgroup"
 )
 
 func TestReadvReader(t *testing.T) {

common/buf/writer.go

@@ -5,10 +5,9 @@ import (
 	"net"
 	"sync"
 
-	"github.com/xtls/xray-core/features/stats"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/features/stats"
 )
 
 // BufferToBytesWriter is a Writer that writes alloc.Buffer into underlying writer.

common/buf/writer_test.go

@@ -8,7 +8,6 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-
 	"github.com/xtls/xray-core/common"
 	. "github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/transport/pipe"

common/cache/lru.go

@@ -26,7 +26,7 @@ type lruElement struct {
 	value interface{}
 }
 
-// NewLru init a lru cache
+// NewLru initializes a lru cache
 func NewLru(cap int) Lru {
 	return &lru{
 		capacity:         cap,

common/crypto/auth.go

@@ -39,8 +39,12 @@ func GenerateIncreasingNonce(nonce []byte) BytesGenerator {
 	}
 }
 
-func GenerateInitialAEADNonce() BytesGenerator {
+func GenerateAEADNonceWithSize(nonceSize int) BytesGenerator {
-	return GenerateIncreasingNonce([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF})
+	c := make([]byte, nonceSize)
+	for i := 0; i < nonceSize; i++ {
+		c[i] = 0xFF
+	}
+	return GenerateIncreasingNonce(c)
 }
 
 type Authenticator interface {

common/crypto/auth_test.go

@@ -9,7 +9,6 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	. "github.com/xtls/xray-core/common/crypto"

common/crypto/chacha20_test.go

@@ -6,7 +6,6 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-
 	"github.com/xtls/xray-core/common"
 	. "github.com/xtls/xray-core/common/crypto"
 )

common/drain/drain.go

@@ -0,0 +1,10 @@
+package drain
+
+import "io"
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
+
+type Drainer interface {
+	AcknowledgeReceive(size int)
+	Drain(reader io.Reader) error
+}

common/drain/drainer.go

@@ -0,0 +1,62 @@
+package drain
+
+import (
+	"io"
+	"io/ioutil"
+
+	"github.com/xtls/xray-core/common/dice"
+)
+
+type BehaviorSeedLimitedDrainer struct {
+	DrainSize int
+}
+
+func NewBehaviorSeedLimitedDrainer(behaviorSeed int64, drainFoundation, maxBaseDrainSize, maxRandDrain int) (Drainer, error) {
+	behaviorRand := dice.NewDeterministicDice(behaviorSeed)
+	BaseDrainSize := behaviorRand.Roll(maxBaseDrainSize)
+	RandDrainMax := behaviorRand.Roll(maxRandDrain) + 1
+	RandDrainRolled := dice.Roll(RandDrainMax)
+	DrainSize := drainFoundation + BaseDrainSize + RandDrainRolled
+	return &BehaviorSeedLimitedDrainer{DrainSize: DrainSize}, nil
+}
+
+func (d *BehaviorSeedLimitedDrainer) AcknowledgeReceive(size int) {
+	d.DrainSize -= size
+}
+
+func (d *BehaviorSeedLimitedDrainer) Drain(reader io.Reader) error {
+	if d.DrainSize > 0 {
+		err := drainReadN(reader, d.DrainSize)
+		if err == nil {
+			return newError("drained connection")
+		}
+		return newError("unable to drain connection").Base(err)
+	}
+	return nil
+}
+
+func drainReadN(reader io.Reader, n int) error {
+	_, err := io.CopyN(ioutil.Discard, reader, int64(n))
+	return err
+}
+
+func WithError(drainer Drainer, reader io.Reader, err error) error {
+	drainErr := drainer.Drain(reader)
+	if drainErr == nil {
+		return err
+	}
+	return newError(drainErr).Base(err)
+}
+
+type NopDrainer struct{}
+
+func (n NopDrainer) AcknowledgeReceive(size int) {
+}
+
+func (n NopDrainer) Drain(reader io.Reader) error {
+	return nil
+}
+
+func NewNopDrainer() Drainer {
+	return &NopDrainer{}
+}

common/drain/errors.generated.go

@@ -0,0 +1,9 @@
+package drain
+
+import "github.com/xtls/xray-core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}

common/errors/errors.go

@@ -2,7 +2,6 @@
 package errors // import "github.com/xtls/xray-core/common/errors"
 
 import (
-	"os"
 	"reflect"
 	"strings"
 
@@ -13,8 +12,8 @@ import (
 const trim = len("github.com/xtls/xray-core/")
 
 type hasInnerError interface {
-	// Inner returns the underlying error of this one.
+	// Unwrap returns the underlying error of this one.
-	Inner() error
+	Unwrap() error
 }
 
 type hasSeverity interface {
@@ -72,8 +71,8 @@ func (err *Error) Error() string {
 	return builder.String()
 }
 
-// Inner implements hasInnerError.Inner()
+// Unwrap implements hasInnerError.Unwrap()
-func (err *Error) Inner() error {
+func (err *Error) Unwrap() error {
 	if err.inner == nil {
 		return nil
 	}
@@ -171,20 +170,10 @@ L:
 	for {
 		switch inner := err.(type) {
 		case hasInnerError:
-			if inner.Inner() == nil {
+			if inner.Unwrap() == nil {
 				break L
 			}
-			err = inner.Inner()
+			err = inner.Unwrap()
-		case *os.PathError:
-			if inner.Err == nil {
-				break L
-			}
-			err = inner.Err
-		case *os.SyscallError:
-			if inner.Err == nil {
-				break L
-			}
-			err = inner.Err
 		default:
 			break L
 		}

common/errors/errors_test.go

@@ -6,7 +6,6 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-
 	. "github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/log"
 )

common/log/log.go

@@ -34,7 +34,7 @@ func Record(msg Message) {
 
 var logHandler syncHandler
 
-// RegisterHandler register a new handler as current log handler. Previous registered handler will be discarded.
+// RegisterHandler registers a new handler as current log handler. Previous registered handler will be discarded.
 func RegisterHandler(handler Handler) {
 	if handler == nil {
 		panic("Log handler is nil")