Merge pull request #909 from iBug/pkg

chore: Create /etc/gost directory with package manager

.gitignore

@@ -32,10 +32,22 @@ _testmain.go
 *.bak
 
 cmd/gost/gost
-gost
+/gost
 snap
 
 *.pem
 /*.yaml
 *.txt
 dist/
+
+# Build artifacts
+.build/
+
+# Codegraph index (generated, multi-hundred-MB db)
+.codegraph/
+
+# Python cache
+__pycache__/
+
+# Claude session config
+.claude/

.goreleaser.yaml

@@ -1,3 +1,5 @@
+version: 2
+
 # This is an example .goreleaser.yml file with some sensible defaults.
 # Make sure to check the documentation at https://goreleaser.com
 before:
@@ -7,7 +9,8 @@ before:
     # you may remove this if you don't need go generate
     # - go generate ./...
 builds:
-  - env:
+  - id: gost
+    env:
       - CGO_ENABLED=0
     main: ./cmd/gost
     targets:
@@ -38,6 +41,16 @@ builds:
       - android_arm64
     ldflags:
       - "-s -w -X 'main.version={{ .Tag }}'"
+  - id: gost-packages
+    env:
+      - CGO_ENABLED=0
+    main: ./cmd/gost
+    targets:
+      - linux_amd64
+      - linux_amd64_v3
+      - linux_arm64
+    ldflags:
+      - "-s -w -X 'main.version={{ .Tag }}'"
 
 upx:
   - # UPX compression. Disabled by default (see #863): upx --best/--lzma/--brute
@@ -46,15 +59,53 @@ upx:
     enabled: false
 
 archives:
-  - format: tar.gz
+  - ids:
+      - gost
+    formats:
+      - tar.gz
+    builds_info:
+      group: root
+      owner: root
     # use zip for windows archives
     format_overrides:
     - goos: windows
-      format: zip
+      formats:
+        - zip
+
+nfpms:
+  - id: packages
+    package_name: gost
+    ids:
+      - gost-packages
+    vendor: go-gost
+    homepage: https://gost.run/
+    maintainer: go-gost contributors
+    description: GO Simple Tunnel
+    license: MIT
+    formats:
+      - deb
+      - rpm
+    bindir: /usr/bin
+    contents:
+      - src: gost.service
+        dst: /usr/lib/systemd/system/gost.service
+      - src: README.md
+        dst: /usr/share/doc/gost/README.md
+      - src: README_en.md
+        dst: /usr/share/doc/gost/README_en.md
+      - src: LICENSE
+        dst: /usr/share/doc/gost/LICENSE
+      - src: gost.yml
+        dst: /usr/share/doc/gost/examples/gost.yml
+      - dst: /etc/gost
+        type: dir
+        file_info:
+          mode: 0755
+
 checksum:
   name_template: 'checksums.txt'
 snapshot:
-  name_template: "{{ incpatch .Version }}-next"
+  version_template: "{{ incpatch .Version }}-next"
 changelog:
   sort: asc
   filters:

README.md

@@ -54,6 +54,22 @@ GOST作为隧道有三种主要使用方式。
 
 [https://github.com/go-gost/gost/releases](https://github.com/go-gost/gost/releases)
 
+### 系统包（DEB/RPM）
+
+从 [Releases](https://github.com/go-gost/gost/releases) 下载对应架构的安装包（`amd64`、`amd64v3`、`arm64`）：
+
+```bash
+# Debian/Ubuntu
+sudo apt install ./gost_<version>_linux_amd64.deb
+
+# RHEL/Fedora
+sudo dnf install ./gost_<version>_linux_amd64.rpm
+```
+
+`amd64v3` 包需要支持 AVX2 的 CPU（x86-64-v3），否则请使用 `amd64`。
+
+安装包附带 systemd 服务，但不会自动启用：先创建 `/etc/gost/gost.yml`（示例见 `/usr/share/doc/gost/examples/gost.yml`），再执行 `sudo systemctl enable --now gost`。未提供配置文件时该服务会被跳过，而不是报错。
+
 ### 安装脚本
 
 ```bash

README_en.md

@@ -54,6 +54,22 @@ Use tunnel and intranet penetration to expose local services behind NAT or firew
 
 [https://github.com/go-gost/gost/releases](https://github.com/go-gost/gost/releases)
 
+### Packages (DEB/RPM)
+
+Download the package for your architecture from the [releases page](https://github.com/go-gost/gost/releases) (`amd64`, `amd64v3`, `arm64`):
+
+```bash
+# Debian/Ubuntu
+sudo apt install ./gost_<version>_linux_amd64.deb
+
+# RHEL/Fedora
+sudo dnf install ./gost_<version>_linux_amd64.rpm
+```
+
+The `amd64v3` package requires an AVX2-capable CPU (x86-64-v3); use `amd64` otherwise.
+
+The packages ship a systemd service, but it is not enabled automatically: create `/etc/gost/gost.yml` first (see `/usr/share/doc/gost/examples/gost.yml`), then run `sudo systemctl enable --now gost`. Without a config file the service is skipped rather than failing.
+
 ### install script
 
 ```bash

cmd/gost/program.go

@@ -21,6 +21,7 @@ import (
 	"github.com/go-gost/x/config/parsing/parser"
 	xmetrics "github.com/go-gost/x/metrics"
 	metrics "github.com/go-gost/x/metrics/service"
+	xplugin "github.com/go-gost/x/plugin"
 	"github.com/go-gost/x/registry"
 	"github.com/judwhite/go-svc"
 )
@@ -191,6 +192,8 @@ func (p *program) Stop() error {
 		logger.Default().Debug("service @profiling shutdown")
 	}
 
+	xplugin.Shutdown()
+
 	return nil
 }
 

cmd/gost/version.go

@@ -1,5 +1,5 @@
 package main
 
 var (
-	version = "3.3.0"
+	version = "3.3.1"
 )

go.mod

@@ -3,8 +3,8 @@ module github.com/go-gost/gost
 go 1.26.3
 
 require (
-	github.com/go-gost/core v0.5.1
-	github.com/go-gost/x v0.13.0
+	github.com/go-gost/core v0.6.1
+	github.com/go-gost/x v0.19.5
 	github.com/judwhite/go-svc v1.2.1
 	github.com/moby/moby/client v0.4.0
 	github.com/stretchr/testify v1.11.1
@@ -17,15 +17,14 @@ require (
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 // indirect
 	github.com/alessio/shellescape v1.4.1 // indirect
-	github.com/andybalholm/brotli v1.0.6 // indirect
-	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d // indirect
+	github.com/andybalholm/brotli v1.2.2 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/bytedance/sonic v1.11.6 // indirect
-	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/bytedance/gopkg v0.1.3 // indirect
+	github.com/bytedance/sonic v1.15.0 // indirect
+	github.com/bytedance/sonic/loader v0.5.0 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/cloudwego/base64x v0.1.4 // indirect
-	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/cloudwego/base64x v0.1.6 // indirect
 	github.com/containerd/errdefs v1.0.0 // indirect
 	github.com/containerd/errdefs/pkg v0.3.0 // indirect
 	github.com/containerd/log v0.1.0 // indirect
@@ -42,25 +41,27 @@ require (
 	github.com/ebitengine/purego v0.10.0 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
-	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.12 // indirect
 	github.com/gin-contrib/cors v1.7.2 // indirect
-	github.com/gin-contrib/sse v0.1.0 // indirect
-	github.com/gin-gonic/gin v1.10.1 // indirect
-	github.com/go-gost/go-shadowsocks2 v0.1.3 // indirect
+	github.com/gin-contrib/sse v1.1.0 // indirect
+	github.com/gin-gonic/gin v1.12.0 // indirect
+	github.com/go-gost/go-shadowsocks2 v0.1.4 // indirect
 	github.com/go-gost/gosocks4 v0.1.0 // indirect
 	github.com/go-gost/gosocks5 v0.5.0 // indirect
-	github.com/go-gost/plugin v0.4.0 // indirect
-	github.com/go-gost/relay v0.6.1 // indirect
-	github.com/go-gost/tls-dissector v0.2.0 // indirect
+	github.com/go-gost/plugin v0.8.1 // indirect
+	github.com/go-gost/quic-dissector v0.1.0 // indirect
+	github.com/go-gost/relay v0.7.0 // indirect
+	github.com/go-gost/tls-dissector v0.3.1 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/go-playground/validator/v10 v10.30.1 // indirect
 	github.com/go-redis/redis/v8 v8.11.5 // indirect
 	github.com/gobwas/glob v0.2.3 // indirect
-	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/goccy/go-json v0.10.5 // indirect
+	github.com/goccy/go-yaml v1.19.2 // indirect
 	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/btree v1.1.3 // indirect
@@ -68,57 +69,56 @@ require (
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect
-	github.com/gravitational/trace v1.1.16-0.20220114165159-14a9a7dd6aaf // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
-	github.com/jonboulle/clockwork v0.2.2 // indirect
+	github.com/hashicorp/yamux v0.1.1 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.18.5 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
-	github.com/klauspost/reedsolomon v1.11.8 // indirect
+	github.com/klauspost/compress v1.19.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.4.0 // indirect
+	github.com/klauspost/reedsolomon v1.12.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
 	github.com/magiconair/properties v1.8.10 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-isatty v0.0.22 // indirect
 	github.com/miekg/dns v1.1.61 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
-	github.com/moby/go-archive v0.2.0 // indirect
+	github.com/moby/go-archive v0.3.0 // indirect
 	github.com/moby/moby/api v1.54.1 // indirect
 	github.com/moby/patternmatcher v0.6.1 // indirect
-	github.com/moby/sys/sequential v0.6.0 // indirect
-	github.com/moby/sys/user v0.4.0 // indirect
+	github.com/moby/sys/sequential v0.7.0 // indirect
+	github.com/moby/sys/user v0.4.1 // indirect
 	github.com/moby/sys/userns v0.1.0 // indirect
 	github.com/moby/term v0.5.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.1 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
-	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
-	github.com/pion/dtls/v3 v3.1.1 // indirect
+	github.com/pelletier/go-toml/v2 v2.4.2 // indirect
+	github.com/pion/dtls/v3 v3.1.4 // indirect
 	github.com/pion/logging v0.2.4 // indirect
 	github.com/pion/transport/v4 v4.0.1 // indirect
 	github.com/pires/go-proxyproto v0.8.1 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
-	github.com/prometheus/client_golang v1.19.1 // indirect
-	github.com/prometheus/client_model v0.6.0 // indirect
-	github.com/prometheus/common v0.48.0 // indirect
-	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/prometheus/client_golang v1.21.1 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.62.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/quic-go/qpack v0.6.0 // indirect
-	github.com/quic-go/quic-go v0.59.1 // indirect
-	github.com/quic-go/webtransport-go v0.10.0 // indirect
+	github.com/quic-go/quic-go v0.60.0 // indirect
+	github.com/quic-go/webtransport-go v0.11.1 // indirect
 	github.com/refraction-networking/utls v1.8.2 // indirect
 	github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 // indirect
 	github.com/rs/xid v1.3.0 // indirect
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
 	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
-	github.com/shadowsocks/go-shadowsocks2 v0.1.6-0.20241020092332-e1fe9ea73740 // indirect
 	github.com/shirou/gopsutil/v3 v3.24.5 // indirect
 	github.com/shirou/gopsutil/v4 v4.26.3 // indirect
-	github.com/shoenig/go-m1cpu v0.1.6 // indirect
+	github.com/shoenig/go-m1cpu v0.2.1 // indirect
 	github.com/sirupsen/logrus v1.9.4 // indirect
 	github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8 // indirect
 	github.com/sourcegraph/conc v0.3.0 // indirect
@@ -127,46 +127,47 @@ require (
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/spf13/viper v1.19.0 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
-	github.com/templexxx/cpu v0.1.1 // indirect
-	github.com/templexxx/xorsimd v0.4.3 // indirect
+	github.com/tidwall/gjson v1.19.0 // indirect
+	github.com/tidwall/match v1.1.1 // indirect
+	github.com/tidwall/pretty v1.2.0 // indirect
+	github.com/tidwall/sjson v1.2.5 // indirect
 	github.com/tjfoc/gmsm v1.4.1 // indirect
 	github.com/tklauser/go-sysconf v0.3.16 // indirect
 	github.com/tklauser/numcpus v0.11.0 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
-	github.com/ugorji/go/codec v1.2.12 // indirect
+	github.com/ugorji/go/codec v1.3.1 // indirect
 	github.com/vishvananda/netlink v1.1.1-0.20211118161826-650dca95af54 // indirect
 	github.com/vishvananda/netns v0.0.4 // indirect
-	github.com/vulcand/predicate v1.2.0 // indirect
 	github.com/xjasonlyu/tun2socks/v2 v2.6.0 // indirect
-	github.com/xtaci/kcp-go/v5 v5.6.5 // indirect
-	github.com/xtaci/smux v1.5.31 // indirect
+	github.com/xtaci/kcp-go/v5 v5.6.72 // indirect
+	github.com/xtaci/smux v1.5.57 // indirect
 	github.com/xtaci/tcpraw v1.2.25 // indirect
 	github.com/yl2chen/cidranger v1.0.2 // indirect
 	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	github.com/zalando/go-keyring v0.2.4 // indirect
 	github.com/zeebo/blake3 v0.2.4 // indirect
+	go.mongodb.org/mongo-driver/v2 v2.7.0 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.60.0 // indirect
-	go.opentelemetry.io/otel v1.41.0 // indirect
-	go.opentelemetry.io/otel/metric v1.41.0 // indirect
-	go.opentelemetry.io/otel/trace v1.41.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0 // indirect
+	go.opentelemetry.io/otel v1.44.0 // indirect
+	go.opentelemetry.io/otel/metric v1.44.0 // indirect
+	go.opentelemetry.io/otel/trace v1.44.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/arch v0.8.0 // indirect
-	golang.org/x/crypto v0.50.0 // indirect
+	golang.org/x/arch v0.22.0 // indirect
+	golang.org/x/crypto v0.55.0 // indirect
 	golang.org/x/exp v0.0.0-20241210194714-1829a127f884 // indirect
-	golang.org/x/mod v0.34.0 // indirect
-	golang.org/x/net v0.53.0 // indirect
-	golang.org/x/sync v0.20.0 // indirect
-	golang.org/x/sys v0.43.0 // indirect
-	golang.org/x/term v0.42.0 // indirect
-	golang.org/x/text v0.36.0 // indirect
-	golang.org/x/time v0.12.0 // indirect
-	golang.org/x/tools v0.43.0 // indirect
+	golang.org/x/mod v0.38.0 // indirect
+	golang.org/x/net v0.58.0 // indirect
+	golang.org/x/sync v0.22.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
+	golang.org/x/text v0.41.0 // indirect
+	golang.org/x/time v0.14.0 // indirect
+	golang.org/x/tools v0.48.0 // indirect
 	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
 	golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
-	google.golang.org/grpc v1.79.3 // indirect
-	google.golang.org/protobuf v1.36.10 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260723215102-3fe39f3c1018 // indirect
+	google.golang.org/grpc v1.83.2 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

go.sum

@@ -12,26 +12,24 @@ github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 h1:s6gZFSlWYmbqAu
 github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137/go.mod h1:OMCwj8VM1Kc9e19TLln2VL61YJF0x1XFtfdL4JdbSyE=
 github.com/alessio/shellescape v1.4.1 h1:V7yhSDDn8LP4lc4jS8pFkt0zCnzVJlG5JXy9BVKJUX0=
 github.com/alessio/shellescape v1.4.1/go.mod h1:PZAiSCk0LJaZkiCSkPv8qIobYglO3FPpyFjDCtHLS30=
-github.com/andybalholm/brotli v1.0.6 h1:Yf9fFpf49Zrxb9NlQaluyE92/+X7UVHlhMNJN2sxfOI=
-github.com/andybalholm/brotli v1.0.6/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
-github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d h1:Byv0BzEl3/e6D5CLfI0j/7hiIEtvGVFPCZ7Ei2oq8iQ=
-github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
+github.com/andybalholm/brotli v1.2.2 h1:HzTuoo2ErYQqf5qvcJInB8uvqSVxRttzkFexPWtnceM=
+github.com/andybalholm/brotli v1.2.2/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
-github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
-github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
-github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
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@@ -214,6 +213,8 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w
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@@ -243,21 +244,23 @@ github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRI
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@@ -301,26 +301,27 @@ github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpE
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@@ -329,25 +330,25 @@ github.com/tklauser/numcpus v0.11.0 h1:nSTwhKH5e1dMNsCdVBukSZrURJRoHbSEQjdEbY+9R
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@@ -360,34 +361,34 @@ github.com/zeebo/blake3 v0.2.4 h1:KYQPkhpRtcqh0ssGYcKLG1JYvddkEA8QwCM/yBqhaZI=
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@@ -396,8 +397,8 @@ golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvx
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
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@@ -405,75 +406,70 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn
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 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
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 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
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 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
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 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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 golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI=
 golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb h1:whnFRlWMcXI9d+ZbWg+4sHnLp52d5yiIPUxMBSt4X9A=
 golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb/go.mod h1:rpwXGsirqLqN2L0JDJQlwOboGHmptD5ZD6T2VmcqhTw=
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-gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
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 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
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-google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
-google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
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@@ -493,7 +489,5 @@ gvisor.dev/gvisor v0.0.0-20250523182742-eede7a881b20 h1:0DxLu8hxI1OGp1qVRPqNd+2k
 gvisor.dev/gvisor v0.0.0-20250523182742-eede7a881b20/go.mod h1:3r5CMtNQMKIvBlrmM9xWUNamjKBYPOWyXOjmg5Kts3g=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
 pgregory.net/rapid v1.2.0 h1:keKAYRcjm+e1F0oAuU5F5+YPAWcyxNNRK2wud503Gnk=
 pgregory.net/rapid v1.2.0/go.mod h1:PY5XlDGj0+V1FCq0o192FdRhpKHGTRIWBgqjDBTrq04=
-rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

gost.service

@@ -0,0 +1,46 @@
+[Unit]
+Description=GO Simple Tunnel
+Documentation=https://gost.run/
+After=network-online.target nss-lookup.target
+ConditionPathExists=/etc/gost/gost.yml
+
+[Service]
+Type=simple
+WorkingDirectory=/run/gost
+ExecStart=/usr/bin/gost -C /etc/gost/gost.yml
+ExecReload=/bin/kill -SIGHUP $MAINPID
+
+DynamicUser=yes
+ConfigurationDirectory=gost
+RuntimeDirectory=gost
+LogsDirectory=gost
+TimeoutStopSec=5s
+Restart=on-failure
+RestartSec=1s
+
+AmbientCapabilities=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
+CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
+
+PrivateTmp=yes
+PrivateDevices=no
+ProtectSystem=full
+ProtectHostname=yes
+ProtectHome=yes
+ProtectKernelTunables=yes
+ProtectKernelLogs=yes
+ProtectKernelModules=yes
+ProtectControlGroups=yes
+ProtectClock=yes
+MemoryDenyWriteExecute=yes
+NoNewPrivileges=yes
+
+SystemCallFilter=~@privileged @mount @debug @cpu-emulation @obsolete
+SystemCallFilter=@chown
+SystemCallErrorNumber=EPERM
+SystemCallArchitectures=native
+RestrictNamespaces=yes
+RestrictSUIDSGID=yes
+LockPersonality=yes
+
+[Install]
+WantedBy=multi-user.target

tests/e2e/Dockerfile

@@ -1,4 +1,4 @@
 FROM alpine:3.22
 
 # add tools needed by e2e containers and health checks
-RUN apk add --no-cache iptables curl netcat-openbsd python3
+RUN apk add --no-cache iptables curl netcat-openbsd python3 openssl

tests/e2e/README.md

@@ -35,7 +35,7 @@ tests/e2e/
 │   └── udp_echo.py             # UDP echo server (reflects payloads)
 ├── testdata/                   # config files or data files for running cases
 ├── shadowsocks_test.go         # Shadowsocks protocol tests
-└── parallel_selector_test.go   # Parallel node selector tests
+└── selector_test.go            # Node selector tests (round-robin, fifo, backup, parallel)
 ```
 
 ### How it works

tests/e2e/admission_test.go

@@ -0,0 +1,111 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// AdmissionSuite verifies service-level admission control, which gates
+// connections by the client's source address. It contrasts a loopback client
+// (curl run inside the gost container, source 127.0.0.1) against an external
+// client (curl run inside the echo container, source = its container IP).
+type AdmissionSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+}
+
+func (s *AdmissionSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *AdmissionSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// curlIn runs curl inside the given container, proxying through the gost proxy
+// at proxyAddr to the echo server, and returns the response body. An admitted
+// request returns "hello-gost"; a denied connection returns an empty body.
+func (s *AdmissionSuite) curlIn(c testcontainers.Container, proxyAddr string) string {
+	cmd := []string{
+		"curl", "-s",
+		"-x", fmt.Sprintf("http://%s", proxyAddr),
+		fmt.Sprintf("http://%s:5678", s.echoIP),
+	}
+	_, out, err := c.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+// TestWhitelistAdmitLoopback verifies that a whitelisted source (127.0.0.1,
+// a loopback client inside the gost container) is admitted and reaches the
+// echo server.
+func (s *AdmissionSuite) TestWhitelistAdmitLoopback() {
+	gostC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/admission/whitelist.yaml", []string{"gost-proxy"}, []string{"8080/tcp"})
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	body := s.curlIn(gostC, "127.0.0.1:8080")
+	s.Require().Contains(body, "hello-gost")
+}
+
+// TestWhitelistDenyExternal verifies that a non-whitelisted source (an external
+// container, not 127.0.0.1) is denied, so the request never reaches the echo
+// server.
+func (s *AdmissionSuite) TestWhitelistDenyExternal() {
+	gostC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/admission/whitelist.yaml", []string{"gost-proxy"}, []string{"8080/tcp"})
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	body := s.curlIn(s.echoC, "gost-proxy:8080")
+	s.Require().NotContains(body, "hello-gost")
+}
+
+// TestBlacklistDenyLoopback verifies that a blacklisted source (127.0.0.1,
+// a loopback client inside the gost container) is denied.
+func (s *AdmissionSuite) TestBlacklistDenyLoopback() {
+	gostC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/admission/blacklist.yaml", []string{"gost-proxy"}, []string{"8080/tcp"})
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	body := s.curlIn(gostC, "127.0.0.1:8080")
+	s.Require().NotContains(body, "hello-gost")
+}
+
+// TestBlacklistAdmitExternal verifies that a source outside the blacklist (an
+// external container, not 127.0.0.1) is admitted and reaches the echo server.
+func (s *AdmissionSuite) TestBlacklistAdmitExternal() {
+	gostC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/admission/blacklist.yaml", []string{"gost-proxy"}, []string{"8080/tcp"})
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	body := s.curlIn(s.echoC, "gost-proxy:8080")
+	s.Require().Contains(body, "hello-gost")
+}
+
+func TestAdmissionSuite(t *testing.T) {
+	suite.Run(t, new(AdmissionSuite))
+}

tests/e2e/auth_test.go

@@ -0,0 +1,123 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// AuthSuite verifies proxy authentication on the HTTP handler, using both
+// inline single-user auth and a named auther with multiple users. Requests
+// carry proxy credentials via curl's -x http://user:pass@host form; a rejected
+// request gets a 407 and never reaches the echo server.
+type AuthSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+}
+
+func (s *AuthSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *AuthSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// proxyRequest sends one request through the gost proxy using the given
+// userinfo ("user:pass", or "" for no credentials) and returns the response
+// body. An authenticated request returns "hello-gost"; a rejected one returns
+// an empty body.
+func (s *AuthSuite) proxyRequest(gostC testcontainers.Container, userinfo string) string {
+	proxy := "http://127.0.0.1:8080"
+	if userinfo != "" {
+		proxy = fmt.Sprintf("http://%s@127.0.0.1:8080", userinfo)
+	}
+	cmd := []string{
+		"curl", "-s",
+		"-x", proxy,
+		fmt.Sprintf("http://%s:5678", s.echoIP),
+	}
+	_, out, err := gostC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+func (s *AuthSuite) runGost(cfg string) testcontainers.Container {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, cfg, "8080/tcp")
+	s.Require().NoError(err)
+	return gostC
+}
+
+// TestInlineAuthValid verifies that correct inline credentials are accepted.
+func (s *AuthSuite) TestInlineAuthValid() {
+	gostC := s.runGost("testdata/auth/inline.yaml")
+	defer gostC.Terminate(s.ctx)
+
+	s.Require().Contains(s.proxyRequest(gostC, "user:pass"), "hello-gost")
+}
+
+// TestInlineAuthWrongPassword verifies that a wrong password is rejected.
+func (s *AuthSuite) TestInlineAuthWrongPassword() {
+	gostC := s.runGost("testdata/auth/inline.yaml")
+	defer gostC.Terminate(s.ctx)
+
+	s.Require().NotContains(s.proxyRequest(gostC, "user:wrong"), "hello-gost")
+}
+
+// TestInlineAuthMissing verifies that a request without credentials is rejected.
+func (s *AuthSuite) TestInlineAuthMissing() {
+	gostC := s.runGost("testdata/auth/inline.yaml")
+	defer gostC.Terminate(s.ctx)
+
+	s.Require().NotContains(s.proxyRequest(gostC, ""), "hello-gost")
+}
+
+// TestNamedAutherFirstUser verifies that the first user in a named auther is
+// accepted.
+func (s *AuthSuite) TestNamedAutherFirstUser() {
+	gostC := s.runGost("testdata/auth/auther.yaml")
+	defer gostC.Terminate(s.ctx)
+
+	s.Require().Contains(s.proxyRequest(gostC, "alice:secret"), "hello-gost")
+}
+
+// TestNamedAutherSecondUser verifies that any user in a named auther, not just
+// the first, is accepted.
+func (s *AuthSuite) TestNamedAutherSecondUser() {
+	gostC := s.runGost("testdata/auth/auther.yaml")
+	defer gostC.Terminate(s.ctx)
+
+	s.Require().Contains(s.proxyRequest(gostC, "bob:hunter2"), "hello-gost")
+}
+
+// TestNamedAutherInvalid verifies that credentials not in the named auther are
+// rejected.
+func (s *AuthSuite) TestNamedAutherInvalid() {
+	gostC := s.runGost("testdata/auth/auther.yaml")
+	defer gostC.Terminate(s.ctx)
+
+	s.Require().NotContains(s.proxyRequest(gostC, "alice:wrong"), "hello-gost")
+}
+
+func TestAuthSuite(t *testing.T) {
+	suite.Run(t, new(AuthSuite))
+}

tests/e2e/bypass_test.go

@@ -0,0 +1,116 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+type BypassSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+}
+
+func (s *BypassSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *BypassSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// proxyRequest sends one request through the gost proxy and returns the
+// response body. A bypassed (direct) request that reaches the echo server
+// returns "hello-gost"; a request forced through the dead chain node returns
+// a 503 and no echo body.
+func (s *BypassSuite) proxyRequest(gostC testcontainers.Container, port, target string) string {
+	cmd := []string{
+		"curl", "-s",
+		"-x", fmt.Sprintf("http://127.0.0.1:%s", port),
+		target,
+	}
+	_, out, err := gostC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+// TestBlacklistBypassDirect verifies that a destination matching a blacklist
+// bypass rule skips the (dead) chain node and connects directly to the echo
+// server, so the request succeeds despite the dead node.
+func (s *BypassSuite) TestBlacklistBypassDirect() {
+	cfg, err := RenderConfig("testdata/bypass/blacklist.yaml", ConfigData{ServerAddr: s.echoIP})
+	s.Require().NoError(err)
+	defer os.Remove(cfg)
+
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, cfg, "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	body := s.proxyRequest(gostC, "8080", fmt.Sprintf("http://%s:5678", s.echoIP))
+	s.Require().Contains(body, "hello-gost")
+}
+
+// TestBlacklistBypassViaChain verifies that a destination NOT matching the
+// blacklist bypass is routed through the chain node. With the node dead the
+// request never reaches the echo server, confirming the prior success was due
+// to the bypass.
+func (s *BypassSuite) TestBlacklistBypassViaChain() {
+	cfg, err := RenderConfig("testdata/bypass/blacklist.yaml", ConfigData{ServerAddr: s.echoIP})
+	s.Require().NoError(err)
+	defer os.Remove(cfg)
+
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, cfg, "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	body := s.proxyRequest(gostC, "8080", "http://10.0.0.1:5678")
+	s.Require().NotContains(body, "hello-gost")
+}
+
+// TestWhitelistBypassDirect verifies that a destination outside the whitelist
+// rule is bypassed (connects directly) and reaches the echo server even though
+// the chain node is dead.
+func (s *BypassSuite) TestWhitelistBypassDirect() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/bypass/whitelist.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	body := s.proxyRequest(gostC, "8080", fmt.Sprintf("http://%s:5678", s.echoIP))
+	s.Require().Contains(body, "hello-gost")
+}
+
+// TestWhitelistBypassViaChain verifies that a destination matching the
+// whitelist rule is forced through the chain node; with the node dead the
+// request never reaches the echo server.
+func (s *BypassSuite) TestWhitelistBypassViaChain() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/bypass/whitelist.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	body := s.proxyRequest(gostC, "8080", "http://10.0.0.1:5678")
+	s.Require().NotContains(body, "hello-gost")
+}
+
+func TestBypassSuite(t *testing.T) {
+	suite.Run(t, new(BypassSuite))
+}

tests/e2e/chaingroup_test.go

@@ -0,0 +1,106 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+type ChainGroupSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+}
+
+func (s *ChainGroupSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *ChainGroupSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// proxyRequest sends a request through the gost proxy, using the given
+// target hostname (not IP) so that Host() matchers at the chain-group level
+// can match against it.
+func (s *ChainGroupSuite) proxyRequestHost(gostC testcontainers.Container, proxyPort, targetHost string) (int, string) {
+	cmd := []string{
+		"curl", "-s",
+		"-x", fmt.Sprintf("http://127.0.0.1:%s", proxyPort),
+		fmt.Sprintf("http://%s:5678", targetHost),
+	}
+	code, out, err := gostC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return code, string(body)
+}
+
+// proxyRequestIP sends a request via IP (like existing tests do).
+func (s *ChainGroupSuite) proxyRequestIP(gostC testcontainers.Container, port string) (int, string) {
+	return s.proxyRequestHost(gostC, port, s.echoIP)
+}
+
+// TestMatcherRoutesByHost verifies that a chainGroup with per-entry Host() matchers
+// routes traffic to the chain whose matcher matches the target hostname. The
+// non-matching chain has a dead relay, so if the matcher fails to filter, requests
+// would fail.
+func (s *ChainGroupSuite) TestMatcherRoutesByHost() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/chaingroup/matcher.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// Requests with hostname "tcp-echo" (the echo container's network alias)
+	// must match Host("tcp-echo") → chain-target → live relay → echo server.
+	for range 10 {
+		code, body := s.proxyRequestHost(gostC, "8080", "tcp-echo")
+		s.Require().Equal(0, code, "Host('tcp-echo') must match the target chain")
+		s.Require().Contains(body, "hello-gost")
+	}
+}
+
+// TestProbeMarksDeadChain verifies that a TCP probe detects a dead chain entry
+// and marks it before real traffic, so the FailFilter excludes it. With the dead
+// entry pre-marked, every request succeeds.
+func (s *ChainGroupSuite) TestProbeMarksDeadChain() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/chaingroup/probe.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// The probe fires immediately at startup; by the time we send requests
+	// the dead chain entry is already marked. All requests converge to the
+	// live chain.
+	failures := 0
+	for range 10 {
+		code, body := s.proxyRequestIP(gostC, "8080")
+		if code != 0 || !strings.Contains(body, "hello-gost") {
+			failures++
+		}
+	}
+
+	// At most one failure is acceptable (the first request might race with
+	// the probe's first Mark). Every request after must succeed.
+	s.Require().LessOrEqual(failures, 0,
+		"probe must pre-mark the dead chain entry; all requests must succeed")
+}
+
+func TestChainGroupSuite(t *testing.T) {
+	suite.Run(t, new(ChainGroupSuite))
+}

tests/e2e/failcodes_test.go

@@ -0,0 +1,143 @@
+package e2e
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/moby/moby/client"
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/wait"
+)
+
+type FailCodesSuite struct {
+	suite.Suite
+	ctx     context.Context
+	echoC   testcontainers.Container
+	echoIP  string
+	statusC testcontainers.Container
+}
+
+func (s *FailCodesSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+
+	statusC, err := RunStatusBackendContainer(s.ctx, SharedNetworkName, 429)
+	s.Require().NoError(err)
+	s.statusC = statusC
+}
+
+func (s *FailCodesSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+	if s.statusC != nil {
+		s.statusC.Terminate(s.ctx)
+	}
+}
+
+func (s *FailCodesSuite) sendRawHTTP(gostC testcontainers.Container, host, port string) string {
+	req := fmt.Sprintf(
+		"GET / HTTP/1.1\r\nHost: %s\r\nConnection: close\r\n\r\n",
+		s.echoIP,
+	)
+	encoded := base64.StdEncoding.EncodeToString([]byte(req))
+	cmd := []string{"sh", "-c",
+		fmt.Sprintf("echo %s | base64 -d | nc -w 5 %s %s", encoded, host, port)}
+	_, out, _ := gostC.Exec(s.ctx, cmd)
+	b, _ := io.ReadAll(out)
+	return string(b)
+}
+
+// TestFailCodesConvergence: reverse proxy (tcp handler + sniffing) with FIFO.
+// node-429 is first. After the first 429 response, failCodes marks it (Count=1).
+// FailFilter (maxFails=1) excludes it. All subsequent requests go to node-good.
+func (s *FailCodesSuite) TestFailCodesConvergence() {
+	gostC, err := RunGostContainerWithFiles(s.ctx, SharedNetworkName,
+		"testdata/failcodes/failcodes.yaml",
+		nil,
+		"8080/tcp",
+	)
+	s.Require().NoError(err)
+	defer func() {
+		DumpLogs(s.T(), s.ctx, "gost-failcodes", gostC)
+		gostC.Terminate(s.ctx)
+	}()
+
+	time.Sleep(500 * time.Millisecond)
+
+	const totalRequests = 20
+	var successCount, failCount int
+
+	for range totalRequests {
+		body := s.sendRawHTTP(gostC, "127.0.0.1", "8080")
+
+		if strings.Contains(body, "hello-gost") {
+			successCount++
+			s.T().Logf("  ✓ 200 (node-good)")
+		} else if strings.Contains(body, "status-429") {
+			failCount++
+			s.T().Logf("  ✗ 429 (node-429)")
+		} else {
+			s.T().Logf("  ? %s", strings.TrimSpace(body)[:80])
+		}
+	}
+
+	s.T().Logf("Results: %d successes, %d failures out of %d requests",
+		successCount, failCount, totalRequests)
+
+	// After the first 429 marks node-429, FailFilter excludes it for 10s.
+	// At most 1-2 requests may fail before the marker is set.
+	s.Require().LessOrEqual(failCount, 2,
+		"failCodes: node-429 must be excluded after first 429 response. "+
+			"Got %d failures out of %d requests", failCount, totalRequests)
+}
+
+func TestFailCodesSuite(t *testing.T) {
+	suite.Run(t, new(FailCodesSuite))
+}
+
+func RunStatusBackendContainer(ctx context.Context, networkName string, statusCode int) (testcontainers.Container, error) {
+	req := testcontainers.ContainerRequest{
+		FromDockerfile: testcontainers.FromDockerfile{
+			Context:    ".",
+			Dockerfile: "Dockerfile",
+			Repo:       "gost-e2e",
+			Tag:        "latest",
+			KeepImage:  true,
+			BuildOptionsModifier: func(opts *client.ImageBuildOptions) {
+				opts.NetworkMode = "host"
+			},
+		},
+		Networks: []string{networkName},
+		NetworkAliases: map[string][]string{
+			networkName: {"status-backend"},
+		},
+		Files: []testcontainers.ContainerFile{
+			{HostFilePath: "scripts/http_status_backend.py", ContainerFilePath: "/scripts/http_status_backend.py", FileMode: 0644},
+		},
+		ExposedPorts: []string{"5680/tcp"},
+		Cmd: []string{
+			"python3", "/scripts/http_status_backend.py",
+			fmt.Sprintf("%d", statusCode), "5680",
+		},
+		WaitingFor: wait.ForExposedPort(),
+	}
+
+	return testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+}

tests/e2e/forward_test.go

@@ -286,6 +286,33 @@ func (s *ForwardSuite) TestTCPForwardMultiNodeProtocol() {
 		"HTTP request should route to the http-protocol node via protocol filtering")
 }
 
+// TestUDPForwardQUICSniffing verifies that the UDP forward handler with
+// sniffing enabled correctly detects QUIC traffic and forwards the
+// datagram. A pre-built QUIC Initial packet is sent through the proxy
+// to the UDP echo server; the test passes when the echoed datagram
+// comes back with the same length.
+func (s *ForwardSuite) TestUDPForwardQUICSniffing() {
+	gostC, err := RunGostContainerWithFiles(s.ctx, SharedNetworkName,
+		"testdata/forward/server_udp_sniffing_quic.yaml",
+		[]testcontainers.ContainerFile{
+			{HostFilePath: "scripts/udp_quic_forward_test.py", ContainerFilePath: "/scripts/udp_quic_forward_test.py", FileMode: 0644},
+		},
+		"9000/udp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	code, out, err := gostC.Exec(s.ctx, []string{
+		"python3", "/scripts/udp_quic_forward_test.py",
+		"127.0.0.1", "9000",
+	})
+	output, _ := io.ReadAll(out)
+	s.T().Logf("udp quic forward output:\n%s", string(output))
+	if code != 0 {
+		DumpLogs(s.T(), s.ctx, "udp-quic-forward logs", gostC)
+	}
+	s.Require().Equal(0, code, "udp quic forward test script should exit 0")
+}
+
 func TestForwardSuite(t *testing.T) {
 	suite.Run(t, new(ForwardSuite))
 }

tests/e2e/hosts_test.go

@@ -0,0 +1,85 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// HostsSuite verifies the static hosts mapping (HostMapper), which overrides
+// DNS for matched hostnames. A mapped hostname resolves to the configured IP
+// and reaches the echo server; an unmapped hostname fails to resolve.
+type HostsSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+	gostC  testcontainers.Container
+}
+
+func (s *HostsSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+
+	cfg, err := RenderConfig("testdata/hosts/hosts.yaml", ConfigData{ServerAddr: s.echoIP})
+	s.Require().NoError(err)
+	defer os.Remove(cfg)
+
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, cfg, "8080/tcp")
+	s.Require().NoError(err)
+	s.gostC = gostC
+}
+
+func (s *HostsSuite) TearDownSuite() {
+	if s.gostC != nil {
+		s.gostC.Terminate(s.ctx)
+	}
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// proxyRequest sends a request to the given hostname through the gost proxy and
+// returns the response body. A resolvable host that reaches the echo server
+// returns "hello-gost"; an unresolvable host returns an empty body.
+func (s *HostsSuite) proxyRequest(host string) string {
+	cmd := []string{
+		"curl", "-s",
+		"-x", "http://127.0.0.1:8080",
+		fmt.Sprintf("http://%s:5678", host),
+	}
+	_, out, err := s.gostC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+// TestMappedHostname verifies that a hostname in the hosts mapping resolves to
+// the configured IP and reaches the echo server.
+func (s *HostsSuite) TestMappedHostname() {
+	s.Require().Contains(s.proxyRequest("echo.internal"), "hello-gost")
+}
+
+// TestUnmappedHostname verifies that a hostname absent from the mapping fails to
+// resolve, so the request never reaches the echo server.
+func (s *HostsSuite) TestUnmappedHostname() {
+	s.Require().NotContains(s.proxyRequest("nomap.internal"), "hello-gost")
+}
+
+func TestHostsSuite(t *testing.T) {
+	suite.Run(t, new(HostsSuite))
+}

tests/e2e/http_cache_test.go

@@ -0,0 +1,257 @@
+package e2e
+
+import (
+	"context"
+	"io"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/moby/moby/client"
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/wait"
+)
+
+type HTTPCacheSuite struct {
+	suite.Suite
+	ctx     context.Context
+	beC     testcontainers.Container
+	staleC  testcontainers.Container
+}
+
+func (s *HTTPCacheSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	s.T().Log("start http cache backend container...")
+	beC, err := RunCacheBackendContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.beC = beC
+
+	s.T().Log("start http cache serve-stale backend container...")
+	staleC, err := RunServeStaleBackendContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.staleC = staleC
+}
+
+func (s *HTTPCacheSuite) TearDownSuite() {
+	if s.beC != nil {
+		s.beC.Terminate(s.ctx)
+	}
+	if s.staleC != nil {
+		s.staleC.Terminate(s.ctx)
+	}
+}
+
+// TestHTTPCacheHit verifies that the HTTP response cache returns the cached
+// response on repeat requests. The test backend returns a monotonically
+// increasing counter. With cache enabled, every request returns the same
+// counter value (the cached response from the first request).
+func (s *HTTPCacheSuite) TestHTTPCacheHit() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName,
+		"testdata/http_cache/server_cache.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	cmd := []string{"curl", "-v", "-s", "http://127.0.0.1:8080/"}
+
+	// First request — cache miss, backend returns "cache-test-N"
+	code, out, err := ExecOutput(s.ctx, gostC, cmd)
+	s.Require().NoError(err)
+	body1, _ := io.ReadAll(out)
+	if code != 0 || !strings.Contains(string(body1), "cache-test-") {
+		DumpLogs(s.T(), s.ctx, "cache-proxy logs (first req)", gostC)
+	}
+	s.Require().Equal(0, code, "first request should succeed")
+	// The backend counter is shared across subtests (a fresh counter backend is
+	// not started per test), so the first request here is not necessarily #1.
+	// Caching is proven by body2==body1 and body3==body1 below.
+	s.Require().Contains(string(body1), "cache-test-",
+		"first request should get a backend response")
+
+	// Second request — cache hit, same response
+	code, out, err = ExecOutput(s.ctx, gostC, cmd)
+	s.Require().NoError(err)
+	body2, _ := io.ReadAll(out)
+	if code != 0 {
+		DumpLogs(s.T(), s.ctx, "cache-proxy logs (second req)", gostC)
+	}
+	s.Require().Equal(0, code, "second request should succeed")
+	s.Require().Equal(string(body1), string(body2),
+		"cached response should equal first response")
+
+	// Third request — cache hit, same
+	code, out, err = ExecOutput(s.ctx, gostC, cmd)
+	s.Require().NoError(err)
+	body3, _ := io.ReadAll(out)
+	if code != 0 {
+		DumpLogs(s.T(), s.ctx, "cache-proxy logs (third req)", gostC)
+	}
+	s.Require().Equal(0, code, "third request should succeed")
+	s.Require().Equal(string(body1), string(body3),
+		"cached response should be consistent")
+}
+
+// TestHTTPCacheDisabled verifies that without a named cache, every request
+// reaches the backend and gets a fresh response (monotonically increasing
+// counter). This is the control test: it proves the counting backend works
+// and that the cache test actually validates caching, not incidental
+// idempotency of the backend.
+func (s *HTTPCacheSuite) TestHTTPCacheDisabled() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName,
+		"testdata/http_cache/server_nocache.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	cmd := []string{"curl", "-v", "-s", "http://127.0.0.1:8080/"}
+
+	code, out, err := ExecOutput(s.ctx, gostC, cmd)
+	s.Require().NoError(err)
+	body1, _ := io.ReadAll(out)
+	if code != 0 || !strings.Contains(string(body1), "cache-test-") {
+		DumpLogs(s.T(), s.ctx, "no-cache proxy logs (first req)", gostC)
+	}
+	s.Require().Equal(0, code)
+
+	code, out, err = ExecOutput(s.ctx, gostC, cmd)
+	s.Require().NoError(err)
+	body2, _ := io.ReadAll(out)
+	if code != 0 {
+		DumpLogs(s.T(), s.ctx, "no-cache proxy logs (second req)", gostC)
+	}
+	s.Require().Equal(0, code)
+
+	// Without a named cache, each request hits the backend directly.
+	// The backend increments a counter per request, so consecutive
+	// requests return different bodies.
+	s.Require().NotEqual(string(body1), string(body2),
+		"without cache, consecutive requests should return different responses")
+}
+
+// TestHTTPCacheServeStale verifies that a stale (expired) cached response is
+// served when the upstream fetch fails and cache.serveStale is enabled.
+//
+// The serve-stale backend serves one HTTP request, then shuts down its HTTP
+// server and switches to accepting TCP connections and immediately closing
+// them. This makes the upstream dial succeed but the HTTP response read fail,
+// which triggers the serve-stale path.
+//
+// Steps:
+//  1. First request: cache miss, backend responds → cache stores the response
+//     with TTL 3s. The backend then switches to connection-dropping mode.
+//  2. Wait 4s for the cache entry to expire.
+//  3. Second request: cache hit (stale), dial succeeds (TCP acceptor accepts),
+//     but no HTTP response arrives → http.ReadResponse fails → serveStale
+//     returns the cached "cache-test-1".
+func (s *HTTPCacheSuite) TestHTTPCacheServeStale() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName,
+		"testdata/http_cache/server_cache_servestale.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	cmd := []string{"curl", "-v", "-s", "http://127.0.0.1:8080/"}
+
+	// First request — cache miss, backend returns "cache-test-1"
+	code, out, err := ExecOutput(s.ctx, gostC, cmd)
+	s.Require().NoError(err)
+	body1, _ := io.ReadAll(out)
+	if code != 0 || !strings.Contains(string(body1), "cache-test-") {
+		DumpLogs(s.T(), s.ctx, "serve-stale logs (first req)", gostC)
+	}
+	s.Require().Equal(0, code, "first request should succeed")
+	s.Require().Contains(string(body1), "cache-test-1",
+		"first request should get backend response #1")
+
+	// At this point the backend has shut down its HTTP server and switched to
+	// connection-dropping mode. Wait for cache TTL (3s) to expire.
+	time.Sleep(4 * time.Second)
+
+	// Second request — stale cache hit, upstream connects but yields no
+	// response → serve-stale returns the expired cached response.
+	code, out, err = ExecOutput(s.ctx, gostC, cmd)
+	s.Require().NoError(err)
+	body2, _ := io.ReadAll(out)
+	if code != 0 || !strings.Contains(string(body2), "cache-test-") {
+		DumpLogs(s.T(), s.ctx, "serve-stale logs (second req)", gostC)
+	}
+	s.Require().Equal(0, code, "serve-stale should return the cached response")
+	s.Require().Equal(string(body1), string(body2),
+		"serve-stale should return the expired cached response")
+}
+
+func TestHTTPCacheSuite(t *testing.T) {
+	suite.Run(t, new(HTTPCacheSuite))
+}
+
+// RunCacheBackendContainer starts a container running the cache test HTTP server
+// that returns a monotonically increasing counter in each response body.
+func RunCacheBackendContainer(ctx context.Context, networkName string) (testcontainers.Container, error) {
+	req := cacheBackendContainerRequest(ctx, networkName)
+	return testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+}
+
+func cacheBackendContainerRequest(_ context.Context, networkName string) testcontainers.ContainerRequest {
+	return testcontainers.ContainerRequest{
+		FromDockerfile: testcontainers.FromDockerfile{
+			Context:    ".",
+			Dockerfile: "Dockerfile",
+			Repo:       "gost-e2e",
+			Tag:        "latest",
+			KeepImage:  true,
+			BuildOptionsModifier: func(opts *client.ImageBuildOptions) {
+				opts.NetworkMode = "host"
+			},
+		},
+		Networks: []string{networkName},
+		NetworkAliases: map[string][]string{
+			networkName: {"cache-backend"},
+		},
+		Files: []testcontainers.ContainerFile{
+			{HostFilePath: "scripts/http_cache_backend.py", ContainerFilePath: "/scripts/http_cache_backend.py", FileMode: 0644},
+		},
+		ExposedPorts: []string{"5677/tcp"},
+		Cmd:          []string{"python3", "/scripts/http_cache_backend.py"},
+		WaitingFor:   wait.ForExposedPort(),
+	}
+}
+
+// RunServeStaleBackendContainer starts a container running the serve-stale test
+// HTTP server. It serves one request with a counter body, then replaces itself
+// with a raw TCP socket that accepts connections and immediately closes them.
+// This makes upstream dials succeed but HTTP response reads fail, which
+// triggers the serve-stale path in the sniffer.
+func RunServeStaleBackendContainer(ctx context.Context, networkName string) (testcontainers.Container, error) {
+	req := serveStaleBackendContainerRequest(ctx, networkName)
+	return testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+}
+
+func serveStaleBackendContainerRequest(_ context.Context, networkName string) testcontainers.ContainerRequest {
+	return testcontainers.ContainerRequest{
+		FromDockerfile: testcontainers.FromDockerfile{
+			Context:    ".",
+			Dockerfile: "Dockerfile",
+			Repo:       "gost-e2e",
+			Tag:        "latest",
+			KeepImage:  true,
+			BuildOptionsModifier: func(opts *client.ImageBuildOptions) {
+				opts.NetworkMode = "host"
+			},
+		},
+		Networks: []string{networkName},
+		NetworkAliases: map[string][]string{
+			networkName: {"cache-servestale"},
+		},
+		Files: []testcontainers.ContainerFile{
+			{HostFilePath: "scripts/http_cache_servestale_backend.py", ContainerFilePath: "/scripts/http_cache_servestale_backend.py", FileMode: 0644},
+		},
+		ExposedPorts: []string{"5676/tcp"},
+		Cmd:          []string{"python3", "/scripts/http_cache_servestale_backend.py"},
+		WaitingFor:   wait.ForExposedPort(),
+	}
+}

tests/e2e/http_policy_bypass_test.go

@@ -0,0 +1,108 @@
+package e2e
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/binary"
+	"fmt"
+	"hash/crc32"
+	"io"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// HTTPPolicyBypassSuite reproduces the destination-policy bypass where a valid
+// Gost-Target header replaces req.Host (evaluated by the bypass) but, before the
+// fix, left req.URL.Host (dialed by the transport) as the absolute-URL host.
+// The echo server stands in for the protected backend.
+type HTTPPolicyBypassSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+}
+
+func (s *HTTPPolicyBypassSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *HTTPPolicyBypassSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// sendRaw sends a raw HTTP request to the proxy inside the gost container.
+func (s *HTTPPolicyBypassSuite) sendRaw(gostC testcontainers.Container, data string) string {
+	encoded := base64.StdEncoding.EncodeToString([]byte(data))
+	cmd := []string{"sh", "-c",
+		fmt.Sprintf("echo %s | base64 -d | nc -w 5 127.0.0.1 8080", encoded)}
+	_, out, _ := gostC.Exec(s.ctx, cmd)
+	b, _ := io.ReadAll(out)
+	return string(b)
+}
+
+// encodeTarget encodes a host:port in the GOST v2 Gost-Target format:
+// raw-URL-base64( big-endian-CRC32(name) + raw-URL-base64(name) ).
+func encodeTarget(name string) string {
+	v := []byte(name)
+	b := make([]byte, 4)
+	binary.BigEndian.PutUint32(b, crc32.ChecksumIEEE(v))
+	inner := base64.RawURLEncoding.EncodeToString(v)
+	return base64.RawURLEncoding.EncodeToString(append(b, []byte(inner)...))
+}
+
+// TestGostTargetPolicyBypass asserts that a Gost-Target header naming an
+// allowed authority cannot route a request to a blocked absolute-URL authority.
+func (s *HTTPPolicyBypassSuite) TestGostTargetPolicyBypass() {
+	cfg, err := RenderConfig("testdata/http/server_policy_bypass.yaml", ConfigData{ServerAddr: s.echoIP})
+	s.Require().NoError(err)
+	defer os.Remove(cfg)
+
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, cfg, "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	target := fmt.Sprintf("http://%s:5678/", s.echoIP)
+	marker := "hello-gost"
+
+	// Control: absolute-form request to the blocked address, no target header.
+	// The bypass must deny it before it reaches the echo server.
+	control := fmt.Sprintf("GET %s HTTP/1.1\r\nHost: %s:5678\r\nConnection: close\r\n\r\n",
+		target, s.echoIP)
+	out := s.sendRaw(gostC, control)
+	s.Require().Contains(out, "403", "control request to blocked address should be denied")
+	s.Require().NotContains(out, marker, "control request must not reach the backend")
+
+	// Exploit: same request plus a valid Gost-Target header naming an allowed
+	// authority. Before the fix the transport dials the URL host (echo server)
+	// while the policy checks the header host, leaking the backend response.
+	exploit := fmt.Sprintf("GET %s HTTP/1.1\r\nHost: %s:5678\r\nGost-Target: %s\r\nConnection: close\r\n\r\n",
+		target, s.echoIP, encodeTarget("allowed.example.com:80"))
+	out = s.sendRaw(gostC, exploit)
+	s.Require().NotContains(out, marker,
+		"Gost-Target header must not bypass the destination policy to reach the blocked backend")
+
+	// Fail-closed control: a malformed target header is ignored, so the request
+	// is still evaluated (and denied) against the absolute-URL authority.
+	malformed := fmt.Sprintf("GET %s HTTP/1.1\r\nHost: %s:5678\r\nGost-Target: %s\r\nConnection: close\r\n\r\n",
+		target, s.echoIP, "not-a-valid-target")
+	out = s.sendRaw(gostC, malformed)
+	s.Require().Contains(out, "403", "malformed target header must be ignored and the request denied")
+	s.Require().NotContains(out, marker, "malformed target header must not reach the backend")
+}
+
+func TestHTTPPolicyBypassSuite(t *testing.T) {
+	suite.Run(t, new(HTTPPolicyBypassSuite))
+}

tests/e2e/http_test.go

@@ -600,6 +600,28 @@ func (s *HTTPSuite) TestHTTPUDPRelay() {
 	s.Require().Equal(0, code, "udp relay test script should exit 0")
 }
 
+// TestHTTPProxyOriginForm verifies the nginx proxy_pass scenario
+// (go-gost/gost#679): an upstream client sends an origin-form request
+// ("GET / HTTP/1.1" with only a Host header) instead of the proxy-form
+// absolute URL. The proxy must resolve the target from the Host header.
+func (s *HTTPSuite) TestHTTPProxyOriginForm() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName,
+		"testdata/http/server.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// Origin-form request exactly as nginx proxy_pass emits it, with the
+	// Host header pointing at the echo server via its network alias
+	// ("tcp-echo", registered on SharedNetworkName).
+	req := "GET / HTTP/1.1\r\nHost: tcp-echo:5678\r\nConnection: close\r\n\r\n"
+	out := s.sendRaw(gostC, "127.0.0.1", "8080", req)
+	if !strings.Contains(out, "200") {
+		DumpLogs(s.T(), s.ctx, "http-proxy-origin-form logs", gostC)
+	}
+	s.Assert().Contains(out, "200 OK", "origin-form request should be proxied by Host header")
+	s.Assert().Contains(out, "hello-gost", "echo server response body should come through")
+}
+
 func TestHTTPSuite(t *testing.T) {
 	suite.Run(t, new(HTTPSuite))
 }

tests/e2e/ingress_test.go

@@ -0,0 +1,90 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// IngressSuite verifies hostname→endpoint routing at the reverse-proxy tunnel
+// entrypoint. A public gost runs a tunnel handler with an ingress mapping
+// example.local→tunnel-UUID and an HTTP entrypoint on :8420. An internal client
+// binds a reverse tunnel (tunnel.id=UUID) that forwards to the echo server.
+//
+// A request to the entrypoint with Host:example.local is routed via the ingress
+// table to the tunnel and reaches the echo server ("hello-gost"); a request
+// with an unmapped Host matches no ingress rule and is rejected with no route.
+type IngressSuite struct {
+	suite.Suite
+	ctx     context.Context
+	echoC   testcontainers.Container
+	serverC testcontainers.Container
+	clientC testcontainers.Container
+}
+
+func (s *IngressSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	serverC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/ingress/server.yaml", []string{"gost-server"}, []string{"8420/tcp"})
+	s.Require().NoError(err)
+	s.serverC = serverC
+
+	clientC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/ingress/client.yaml", []string{"gost-client"}, []string{"8423/tcp"})
+	s.Require().NoError(err)
+	s.clientC = clientC
+}
+
+func (s *IngressSuite) TearDownSuite() {
+	for _, c := range []testcontainers.Container{s.clientC, s.serverC, s.echoC} {
+		if c != nil {
+			c.Terminate(s.ctx)
+		}
+	}
+}
+
+// request sends an HTTP GET to the server entrypoint with the given Host
+// header. When waitTunnel is true it retries until the reverse tunnel is bound
+// (the mapped-host happy path); otherwise it makes a single attempt (the
+// unmapped-host case, which should never reach the echo server). Returns the
+// response body.
+func (s *IngressSuite) request(host string, waitTunnel bool) string {
+	loop := "for i in $(seq 1 30); do "
+	if !waitTunnel {
+		loop = "for i in 1; do "
+	}
+	cmd := []string{
+		"sh", "-c",
+		fmt.Sprintf("%sbody=$(curl -s -H 'Host: %s' http://gost-server:8420/); echo \"$body\" | grep -q hello-gost && { echo \"$body\"; exit 0; }; sleep 1; done; echo \"$body\"", loop, host),
+	}
+	_, out, err := s.echoC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+// TestMappedHostname verifies that a Host matching an ingress rule is routed
+// through the tunnel to the echo server.
+func (s *IngressSuite) TestMappedHostname() {
+	s.Require().Contains(s.request("example.local", true), "hello-gost")
+}
+
+// TestUnmappedHostname verifies that a Host with no ingress rule is rejected
+// (no route to host) and never reaches the echo server.
+func (s *IngressSuite) TestUnmappedHostname() {
+	s.Require().NotContains(s.request("nomapped.local", false), "hello-gost")
+}
+
+func TestIngressSuite(t *testing.T) {
+	suite.Run(t, new(IngressSuite))
+}

tests/e2e/mtls_test.go

@@ -0,0 +1,292 @@
+package e2e
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	"io"
+	"math/big"
+	"net"
+	"os"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/moby/moby/client"
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/wait"
+)
+
+type MTLSSuite struct {
+	suite.Suite
+	ctx     context.Context
+	echoC   testcontainers.Container
+	echoIP  string
+	pluginC testcontainers.Container
+	certDir string
+}
+
+func (s *MTLSSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	certDir, err := os.MkdirTemp("", "gost-mtls-certs-*")
+	s.Require().NoError(err)
+	s.certDir = certDir
+
+	s.generateCerts()
+
+	pluginC, err := runAuthPluginContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.pluginC = pluginC
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *MTLSSuite) TearDownSuite() {
+	if s.pluginC != nil {
+		s.pluginC.Terminate(s.ctx)
+	}
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+	os.RemoveAll(s.certDir)
+}
+
+// generateCerts creates a self-signed CA, a server cert signed by the CA,
+// and a client cert signed by the CA, writing PEM files to s.certDir.
+func (s *MTLSSuite) generateCerts() {
+	// CA
+	caKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	s.Require().NoError(err)
+	caTmpl := &x509.Certificate{
+		SerialNumber:          big.NewInt(1),
+		Subject:               pkix.Name{CommonName: "Test CA"},
+		NotBefore:             time.Now(),
+		NotAfter:              time.Now().Add(24 * time.Hour),
+		KeyUsage:              x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature,
+		BasicConstraintsValid: true,
+		IsCA:                  true,
+	}
+	caDER, err := x509.CreateCertificate(rand.Reader, caTmpl, caTmpl, &caKey.PublicKey, caKey)
+	s.Require().NoError(err)
+	s.writeCertPEM(s.certDir+"/ca.pem", "CERTIFICATE", caDER)
+	s.writeKeyPEM(s.certDir+"/ca-key.pem", "EC PRIVATE KEY", caKey)
+
+	// Server
+	serverKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	s.Require().NoError(err)
+	serverTmpl := &x509.Certificate{
+		SerialNumber: big.NewInt(2),
+		Subject:      pkix.Name{CommonName: "localhost"},
+		NotBefore:    time.Now(),
+		NotAfter:     time.Now().Add(24 * time.Hour),
+		KeyUsage:     x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		DNSNames:     []string{"localhost"},
+		IPAddresses:  []net.IP{net.ParseIP("127.0.0.1")},
+	}
+	serverDER, err := x509.CreateCertificate(rand.Reader, serverTmpl, caTmpl, &serverKey.PublicKey, caKey)
+	s.Require().NoError(err)
+	s.writeCertPEM(s.certDir+"/server.pem", "CERTIFICATE", serverDER)
+	s.writeKeyPEM(s.certDir+"/server-key.pem", "EC PRIVATE KEY", serverKey)
+
+	// Client
+	clientKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	s.Require().NoError(err)
+	clientTmpl := &x509.Certificate{
+		SerialNumber:   big.NewInt(3),
+		Subject:        pkix.Name{CommonName: "test-client"},
+		NotBefore:      time.Now(),
+		NotAfter:       time.Now().Add(24 * time.Hour),
+		KeyUsage:       x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:    []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
+		EmailAddresses: []string{"test@example.com"},
+	}
+	clientDER, err := x509.CreateCertificate(rand.Reader, clientTmpl, caTmpl, &clientKey.PublicKey, caKey)
+	s.Require().NoError(err)
+	s.writeCertPEM(s.certDir+"/client.pem", "CERTIFICATE", clientDER)
+	s.writeKeyPEM(s.certDir+"/client-key.pem", "EC PRIVATE KEY", clientKey)
+}
+
+// TestMTLSProxy verifies HTTP forward proxy works over an mTLS listener
+// with a valid client certificate.
+func (s *MTLSSuite) TestMTLSProxy() {
+	rendered, err := RenderConfig("testdata/mtls/server.yaml",
+		ConfigData{ServerAddr: "auth-plugin"})
+	s.Require().NoError(err)
+	defer os.Remove(rendered)
+
+	gostC, err := RunGostContainerWithFiles(s.ctx, SharedNetworkName, rendered,
+		[]testcontainers.ContainerFile{
+			{HostFilePath: s.certDir + "/ca.pem", ContainerFilePath: "/certs/ca.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/server.pem", ContainerFilePath: "/certs/server.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/server-key.pem", ContainerFilePath: "/certs/server-key.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/client.pem", ContainerFilePath: "/certs/client.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/client-key.pem", ContainerFilePath: "/certs/client-key.pem", FileMode: 0644},
+		},
+		"8443/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// Verify proxy works with valid client cert. curl in HTTPS-proxy mode
+	// requires --proxy-* TLS options: --cacert/--cert verify the origin (not
+	// the proxy) and are ignored for the proxy TLS connection.
+	cmd := []string{"curl", "-v", "-s", "--connect-timeout", "5",
+		"--proxy-cacert", "/certs/ca.pem",
+		"--proxy-cert", "/certs/client.pem",
+		"--proxy-key", "/certs/client-key.pem",
+		"-x", "https://127.0.0.1:8443",
+		fmt.Sprintf("http://%s:5678", s.echoIP)}
+	code, out, err := ExecOutput(s.ctx, gostC, cmd)
+	body, err2 := io.ReadAll(out)
+	if err != nil || err2 != nil || code != 0 || !strings.Contains(string(body), "hello-gost") {
+		DumpLogs(s.T(), s.ctx, "mtls gost logs", gostC)
+		DumpLogs(s.T(), s.ctx, "mtls auth-plugin logs", s.pluginC)
+	}
+	s.Require().NoError(err)
+	s.Require().NoError(err2)
+	s.Require().Equal(0, code)
+	s.Require().Contains(string(body), "hello-gost")
+}
+
+// TestMTLSWithoutClientCert verifies that an mTLS listener rejects
+// connections from clients that do not present a certificate.
+func (s *MTLSSuite) TestMTLSWithoutClientCert() {
+	rendered, err := RenderConfig("testdata/mtls/server.yaml",
+		ConfigData{ServerAddr: "auth-plugin"})
+	s.Require().NoError(err)
+	defer os.Remove(rendered)
+
+	gostC, err := RunGostContainerWithFiles(s.ctx, SharedNetworkName, rendered,
+		[]testcontainers.ContainerFile{
+			{HostFilePath: s.certDir + "/ca.pem", ContainerFilePath: "/certs/ca.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/server.pem", ContainerFilePath: "/certs/server.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/server-key.pem", ContainerFilePath: "/certs/server-key.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/client.pem", ContainerFilePath: "/certs/client.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/client-key.pem", ContainerFilePath: "/certs/client-key.pem", FileMode: 0644},
+		},
+		"8443/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// curl without client cert should fail TLS handshake. Verify the proxy
+	// cert against the CA, but present no client cert so the server rejects.
+	cmd := []string{"curl", "-v", "-s", "--connect-timeout", "5",
+		"--proxy-cacert", "/certs/ca.pem",
+		"-x", "https://127.0.0.1:8443",
+		fmt.Sprintf("http://%s:5678", s.echoIP)}
+	code, _, err := ExecOutput(s.ctx, gostC, cmd)
+	if err == nil && code == 0 {
+		DumpLogs(s.T(), s.ctx, "mtls gost logs", gostC)
+	}
+	// Expect failure (non-zero exit code from curl)
+	s.Require().NotEqual(0, code, "curl without client cert should fail with non-zero exit code")
+}
+
+// TestMTLSAuthPluginLogs verifies that the HTTP auth plugin receives
+// the mTLS client certificate identity (client_cn, client_san,
+// client_cert_fingerprint) when a request passes through the mTLS listener.
+func (s *MTLSSuite) TestMTLSAuthPluginLogs() {
+	rendered, err := RenderConfig("testdata/mtls/server.yaml",
+		ConfigData{ServerAddr: "auth-plugin"})
+	s.Require().NoError(err)
+	defer os.Remove(rendered)
+
+	gostC, err := RunGostContainerWithFiles(s.ctx, SharedNetworkName, rendered,
+		[]testcontainers.ContainerFile{
+			{HostFilePath: s.certDir + "/ca.pem", ContainerFilePath: "/certs/ca.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/server.pem", ContainerFilePath: "/certs/server.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/server-key.pem", ContainerFilePath: "/certs/server-key.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/client.pem", ContainerFilePath: "/certs/client.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/client-key.pem", ContainerFilePath: "/certs/client-key.pem", FileMode: 0644},
+		},
+		"8443/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// Send a request with valid client cert through the mTLS proxy.
+	cmd := []string{"curl", "-v", "-s", "--connect-timeout", "5",
+		"--proxy-cacert", "/certs/ca.pem",
+		"--proxy-cert", "/certs/client.pem",
+		"--proxy-key", "/certs/client-key.pem",
+		"-x", "https://127.0.0.1:8443",
+		fmt.Sprintf("http://%s:5678", s.echoIP)}
+	code, out, err := ExecOutput(s.ctx, gostC, cmd)
+	body, _ := io.ReadAll(out)
+	s.Require().NoError(err)
+	s.Require().Equal(0, code)
+	s.Require().Contains(string(body), "hello-gost")
+
+	// Read auth plugin logs and verify PeerCert fields are present.
+	logs, err := s.pluginC.Logs(s.ctx)
+	s.Require().NoError(err)
+	logData, _ := io.ReadAll(logs)
+	logStr := string(logData)
+	s.T().Logf("auth plugin logs:\n%s", logStr)
+
+	s.Require().Contains(logStr, "clientCn", "auth plugin should receive client_cn")
+	s.Require().Contains(logStr, "test-client", "client_cn should be 'test-client'")
+	s.Require().Contains(logStr, "clientSan", "auth plugin should receive client_san")
+	s.Require().Contains(logStr, "clientCertFingerprint", "auth plugin should receive client_cert_fingerprint")
+}
+
+func TestMTLSSuite(t *testing.T) {
+	suite.Run(t, new(MTLSSuite))
+}
+
+// --- helpers ---
+
+func runAuthPluginContainer(ctx context.Context, networkName string) (testcontainers.Container, error) {
+	req := testcontainers.ContainerRequest{
+		FromDockerfile: testcontainers.FromDockerfile{
+			Context:    ".",
+			Dockerfile: "Dockerfile",
+			Repo:       "gost-e2e",
+			Tag:        "latest",
+			KeepImage:  true,
+			BuildOptionsModifier: func(opts *client.ImageBuildOptions) {
+				opts.NetworkMode = "host"
+			},
+		},
+		Networks: []string{networkName},
+		NetworkAliases: map[string][]string{
+			networkName: {"auth-plugin"},
+		},
+		Files: []testcontainers.ContainerFile{
+			{HostFilePath: "scripts/auth_plugin.py", ContainerFilePath: "/scripts/auth_plugin.py", FileMode: 0644},
+		},
+		ExposedPorts: []string{"9000/tcp"},
+		Cmd:          []string{"python3", "/scripts/auth_plugin.py", "9000"},
+		WaitingFor:   wait.ForExposedPort(),
+	}
+	return testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+}
+
+// writeCertPEM writes a DER-encoded certificate to a PEM file.
+func (s *MTLSSuite) writeCertPEM(path, blockType string, der []byte) {
+	err := os.WriteFile(path, pem.EncodeToMemory(&pem.Block{Type: blockType, Bytes: der}), 0644)
+	s.Require().NoError(err)
+}
+
+// writeKeyPEM marshals an ECDSA private key and writes it to a PEM file.
+func (s *MTLSSuite) writeKeyPEM(path, blockType string, key *ecdsa.PrivateKey) {
+	b, err := x509.MarshalECPrivateKey(key)
+	s.Require().NoError(err)
+	err = os.WriteFile(path, pem.EncodeToMemory(&pem.Block{Type: blockType, Bytes: b}), 0600)
+	s.Require().NoError(err)
+}

tests/e2e/parallel_selector_test.go

@@ -1,57 +0,0 @@
-package e2e
-
-import (
-	"context"
-	"fmt"
-	"io"
-	"testing"
-
-	"github.com/stretchr/testify/suite"
-	"github.com/testcontainers/testcontainers-go"
-)
-
-type ParallelSelectorSuite struct {
-	suite.Suite
-	ctx    context.Context
-	echoC  testcontainers.Container
-	echoIP string
-}
-
-func (s *ParallelSelectorSuite) SetupSuite() {
-	s.ctx = context.Background()
-
-	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
-	s.Require().NoError(err)
-	s.echoC = echoC
-
-	echoIP, err := echoC.ContainerIP(s.ctx)
-	s.Require().NoError(err)
-	s.echoIP = echoIP
-}
-
-func (s *ParallelSelectorSuite) TearDownSuite() {
-	if s.echoC != nil {
-		s.echoC.Terminate(s.ctx)
-	}
-}
-
-func (s *ParallelSelectorSuite) TestParallelSelector() {
-	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/parallel_selector/server.yaml", "8080/tcp")
-	s.Require().NoError(err)
-	defer gostC.Terminate(s.ctx)
-
-	// Test the proxy by running curl inside the gost container
-	cmd := []string{"curl", "-v", "-s", "-x", "http://127.0.0.1:8080", fmt.Sprintf("http://%s:5678", s.echoIP)}
-	code, out, err := gostC.Exec(s.ctx, cmd)
-	s.Require().NoError(err)
-
-	body, err := io.ReadAll(out)
-	s.Require().NoError(err)
-	s.Require().Equal(0, code)
-
-	s.Require().Contains(string(body), "hello-gost")
-}
-
-func TestParallelSelectorSuite(t *testing.T) {
-	suite.Run(t, new(ParallelSelectorSuite))
-}

tests/e2e/pht_test.go

@@ -0,0 +1,157 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+type PHTSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+}
+
+func (s *PHTSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	s.T().Logf("start tcp echo container...")
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *PHTSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// TestPHTTunnel verifies a basic PHT tunnel: a client HTTP proxy chains
+// through a PHT dialer to reach a PHT server, which forwards the request
+// to the echo server.
+func (s *PHTSuite) TestPHTTunnel() {
+	serverC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/pht/server.yaml",
+		[]string{"pht-server"}, []string{"8443/tcp"})
+	s.Require().NoError(err)
+	defer serverC.Terminate(s.ctx)
+
+	rendered, err := RenderConfig("testdata/pht/client_connector.yaml",
+		ConfigData{ServerAddr: "pht-server:8443"})
+	s.Require().NoError(err)
+	defer os.Remove(rendered)
+
+	clientC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName,
+		rendered, "8080/tcp")
+	s.Require().NoError(err)
+	defer clientC.Terminate(s.ctx)
+
+	cmd := []string{"curl", "-v", "-s", "-x", "http://127.0.0.1:8080",
+		fmt.Sprintf("http://%s:5678", s.echoIP)}
+	code, out, err := clientC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	if code != 0 || !strings.Contains(string(body), "hello-gost") {
+		DumpLogs(s.T(), s.ctx, "pht client logs", clientC)
+		DumpLogs(s.T(), s.ctx, "pht server logs", serverC)
+	}
+	s.Require().Equal(0, code)
+	s.Require().Contains(string(body), "hello-gost")
+}
+
+// TestPHTSTunnel verifies PHT over TLS. The PHTs listener auto-generates a
+// self-signed cert; the PHTs dialer defaults to InsecureSkipVerify so the
+// handshake succeeds without explicit cert configuration.
+func (s *PHTSuite) TestPHTSTunnel() {
+	serverC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/pht/server_phts.yaml",
+		[]string{"phts-server"}, []string{"8443/tcp"})
+	s.Require().NoError(err)
+	defer serverC.Terminate(s.ctx)
+
+	rendered, err := RenderConfig("testdata/pht/client_connector_phts.yaml",
+		ConfigData{ServerAddr: "phts-server:8443"})
+	s.Require().NoError(err)
+	defer os.Remove(rendered)
+
+	clientC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName,
+		rendered, "8080/tcp")
+	s.Require().NoError(err)
+	defer clientC.Terminate(s.ctx)
+
+	cmd := []string{"curl", "-v", "-s", "-x", "http://127.0.0.1:8080",
+		fmt.Sprintf("http://%s:5678", s.echoIP)}
+	code, out, err := clientC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	if code != 0 || !strings.Contains(string(body), "hello-gost") {
+		DumpLogs(s.T(), s.ctx, "phts client logs", clientC)
+		DumpLogs(s.T(), s.ctx, "phts server logs", serverC)
+	}
+	s.Require().Equal(0, code)
+	s.Require().Contains(string(body), "hello-gost")
+}
+
+// TestPHTHeartbeat verifies that the PHT tunnel stays alive across idle
+// periods. Sends a request, waits >readTimeout (default 10s), and sends
+// another request to confirm the heartbeat kept the connection open.
+func (s *PHTSuite) TestPHTHeartbeat() {
+	serverC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/pht/server.yaml",
+		[]string{"pht-server"}, []string{"8443/tcp"})
+	s.Require().NoError(err)
+	defer serverC.Terminate(s.ctx)
+
+	rendered, err := RenderConfig("testdata/pht/client_connector.yaml",
+		ConfigData{ServerAddr: "pht-server:8443"})
+	s.Require().NoError(err)
+	defer os.Remove(rendered)
+
+	clientC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName,
+		rendered, "8080/tcp")
+	s.Require().NoError(err)
+	defer clientC.Terminate(s.ctx)
+
+	// First request: establish the tunnel.
+	cmd := []string{"curl", "-v", "-s", "-x", "http://127.0.0.1:8080",
+		fmt.Sprintf("http://%s:5678", s.echoIP)}
+	code, out, err := clientC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	body, _ := io.ReadAll(out)
+	s.Require().Equal(0, code)
+	s.Require().Contains(string(body), "hello-gost")
+
+	// Wait longer than readTimeout to trigger heartbeat.
+	// The PHT server's default read timeout is 10s. We wait 12s.
+	cmd = []string{"sh", "-c",
+		fmt.Sprintf("sleep 12 && curl -s -x http://127.0.0.1:8080 http://%s:5678", s.echoIP)}
+	code, out, err = clientC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	body, _ = io.ReadAll(out)
+	if code != 0 || !strings.Contains(string(body), "hello-gost") {
+		DumpLogs(s.T(), s.ctx, "pht heartbeat client logs", clientC)
+		DumpLogs(s.T(), s.ctx, "pht heartbeat server logs", serverC)
+	}
+	s.Require().Equal(0, code)
+	s.Require().Contains(string(body), "hello-gost")
+}
+
+func TestPHTSuite(t *testing.T) {
+	suite.Run(t, new(PHTSuite))
+}

tests/e2e/probe_test.go

@@ -0,0 +1,149 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+type ProbeSuite struct {
+	suite.Suite
+	ctx   context.Context
+	echoC testcontainers.Container
+	echoIP string
+}
+
+func (s *ProbeSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *ProbeSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+func (s *ProbeSuite) proxyRequest(gostC testcontainers.Container, port string) (int, string) {
+	cmd := []string{
+		"curl", "-s",
+		"-x", fmt.Sprintf("http://127.0.0.1:%s", port),
+		fmt.Sprintf("http://%s:5678", s.echoIP),
+	}
+	code, out, err := gostC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return code, string(body)
+}
+
+// TestTCPProbeFailover verifies that the TCP probe detects a dead node and
+// marks it before any real traffic, so the FailFilter excludes it. With the
+// dead node pre-marked, every request succeeds immediately.
+func (s *ProbeSuite) TestTCPProbeFailover() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/probe/tcp.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// The probe fires immediately at startup, so the dead node is already
+	// marked by the time we send requests.
+	for range 10 {
+		code, body := s.proxyRequest(gostC, "8080")
+		s.Require().Equal(0, code, "every request must succeed; dead node pre-marked by probe")
+		s.Require().Contains(body, "hello-gost")
+	}
+}
+
+// TestLowestLatencyProbe verifies that the lowestlatency strategy works with
+// probed nodes. Both nodes are live; the strategy selects the one with the
+// lowest measured latency.
+func (s *ProbeSuite) TestLowestLatencyProbe() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/probe/lowestlatency.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// Give the initial probe a moment to fire so both nodes show healthy.
+	time.Sleep(200 * time.Millisecond)
+
+	for range 10 {
+		code, body := s.proxyRequest(gostC, "8080")
+		s.Require().Equal(0, code, "all requests must succeed with lowestlatency strategy")
+		s.Require().Contains(body, "hello-gost")
+	}
+}
+
+// TestCmdProbeFailover verifies that the cmd probe detects a dead node via
+// shell exit code and marks it before real traffic, so FailFilter excludes it.
+func (s *ProbeSuite) TestCmdProbeFailover() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/probe/cmd.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// The probe fires at startup; the dead node is already marked.
+	for range 10 {
+		code, body := s.proxyRequest(gostC, "8080")
+		s.Require().Equal(0, code, "all requests must succeed; dead cmd node pre-marked")
+		s.Require().Contains(body, "hello-gost")
+	}
+}
+
+// TestProbeRecovery verifies the dead→alive→dead transition that issue #837
+// describes: a node that fails is excluded, and once it recovers (probe flips
+// healthy) it resumes carrying traffic. Both relays stay up; only the cmd
+// probe flag files in the container flip, so no restart is needed.
+//
+// Phase 1: node-a marked dead, node-b healthy → every request goes to node-b.
+// Phase 2: recover node-a, kill node-b → every request must still succeed,
+// which is only possible if node-a's probe recovered it (otherwise both nodes
+// would be excluded and the request would fail).
+func (s *ProbeSuite) TestProbeRecovery() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/probe/recovery.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	// The node probes fire immediately at startup, so let both settle healthy
+	// before we start flipping flag files.
+	time.Sleep(1 * time.Second)
+
+	// Phase 1: knock node-a down, leave node-b up.
+	_, _, err = gostC.Exec(s.ctx, []string{"touch", "/tmp/a_down"})
+	s.Require().NoError(err)
+	time.Sleep(2500 * time.Millisecond) // > probe interval
+
+	for range 10 {
+		code, body := s.proxyRequest(gostC, "8080")
+		s.Require().Equal(0, code, "phase1: dead node-a must be excluded, all traffic via node-b")
+		s.Require().Contains(body, "hello-gost")
+	}
+
+	// Phase 2: recover node-a, knock node-b down. If node-a's probe did not
+	// revive it, the request would fail (no healthy candidate).
+	_, _, err = gostC.Exec(s.ctx, []string{"rm", "-f", "/tmp/a_down", "/tmp/b_down"})
+	s.Require().NoError(err)
+	_, _, err = gostC.Exec(s.ctx, []string{"touch", "/tmp/b_down"})
+	s.Require().NoError(err)
+	time.Sleep(2500 * time.Millisecond)
+
+	for range 10 {
+		code, body := s.proxyRequest(gostC, "8080")
+		s.Require().Equal(0, code, "phase2: recovered node-a must resume carrying traffic")
+		s.Require().Contains(body, "hello-gost")
+	}
+}
+
+func TestProbeSuite(t *testing.T) {
+	suite.Run(t, new(ProbeSuite))
+}

tests/e2e/proxyproto_test.go

@@ -0,0 +1,127 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/moby/moby/client"
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/wait"
+)
+
+// ProxyProtoSuite verifies go-gost/gost#677: a forward/rtcp handler with
+// metadata.proxyProtocol set prepends a HAProxy PROXY protocol header on the
+// outbound connection before forwarding. The backend (proxy-capture) reads the
+// first bytes and reflects the header line back so the test can assert it.
+//
+// This exercises the exact send path the issue asks for (forward/remote's
+// proxyproto.WrapClientConn). A single gost instance is used so the header's
+// source address is the real connecting client — in a full reverse tunnel the
+// source would be the tunnel peer (relay CONNECT propagates only the
+// destination); that limitation is out of scope here.
+type ProxyProtoSuite struct {
+	suite.Suite
+	ctx      context.Context
+	backendC testcontainers.Container
+	gostV1C  testcontainers.Container
+	gostV2C  testcontainers.Container
+}
+
+func (s *ProxyProtoSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	backendC, err := s.runBackend()
+	s.Require().NoError(err)
+	s.backendC = backendC
+
+	gostV1C, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/proxyproto/v1.yaml", []string{"gost-v1"}, []string{"8080/tcp"})
+	s.Require().NoError(err)
+	s.gostV1C = gostV1C
+
+	gostV2C, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/proxyproto/v2.yaml", []string{"gost-v2"}, []string{"8080/tcp"})
+	s.Require().NoError(err)
+	s.gostV2C = gostV2C
+}
+
+func (s *ProxyProtoSuite) TearDownSuite() {
+	for _, c := range []testcontainers.Container{s.gostV1C, s.gostV2C, s.backendC} {
+		if c != nil {
+			c.Terminate(s.ctx)
+		}
+	}
+}
+
+// runBackend starts the raw-TCP PROXY-header-capturing backend, aliased
+// "proxy-capture" on the shared network, listening on 5678. It is also used as
+// the client host (it has python3) to connect through gost.
+func (s *ProxyProtoSuite) runBackend() (testcontainers.Container, error) {
+	req := testcontainers.ContainerRequest{
+		FromDockerfile: testcontainers.FromDockerfile{
+			Context:    ".",
+			Dockerfile: "Dockerfile",
+			Repo:       "gost-e2e",
+			Tag:        "latest",
+			KeepImage:  true,
+			BuildOptionsModifier: func(opts *client.ImageBuildOptions) {
+				opts.NetworkMode = "host"
+			},
+		},
+		Networks: []string{SharedNetworkName},
+		NetworkAliases: map[string][]string{
+			SharedNetworkName: {"proxy-capture"},
+		},
+		Files: []testcontainers.ContainerFile{
+			{HostFilePath: "scripts/proxy_capture.py", ContainerFilePath: "/scripts/proxy_capture.py", FileMode: 0644},
+		},
+		ExposedPorts: []string{"5678/tcp"},
+		Cmd:          []string{"python3", "/scripts/proxy_capture.py"},
+		WaitingFor:   wait.ForExposedPort(),
+	}
+	return testcontainers.GenericContainer(s.ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+}
+
+// request connects from the backend container to gost on :8080, sends a payload,
+// and returns the reflected response (which carries the PROXY header line).
+func (s *ProxyProtoSuite) request(gostHost string) string {
+	cmd := []string{
+		"sh", "-c",
+		fmt.Sprintf("python3 -c \"import socket,sys; s=socket.socket(); s.settimeout(5); s.connect(('%s',8080)); s.sendall(b'hello-gost'); sys.stdout.write(s.recv(4096).decode())\"", gostHost),
+	}
+	_, out, err := s.backendC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+// TestV1HeaderSent asserts gost prepends a text PROXY protocol v1 header.
+func (s *ProxyProtoSuite) TestV1HeaderSent() {
+	body := s.request("gost-v1")
+	if !strings.Contains(body, "PROXY-RECEIVED") || !strings.Contains(body, "PROXY TCP") {
+		DumpLogs(s.T(), s.ctx, "gost-v1 logs", s.gostV1C)
+	}
+	s.Require().Contains(body, "PROXY-RECEIVED")
+	s.Require().Contains(body, "PROXY TCP")
+}
+
+// TestV2HeaderSent asserts gost prepends a binary PROXY protocol v2 header.
+func (s *ProxyProtoSuite) TestV2HeaderSent() {
+	body := s.request("gost-v2")
+	if !strings.Contains(body, "PROXY-V2-RECEIVED") {
+		DumpLogs(s.T(), s.ctx, "gost-v2 logs", s.gostV2C)
+	}
+	s.Require().Contains(body, "PROXY-V2-RECEIVED")
+}
+
+func TestProxyProtoSuite(t *testing.T) {
+	suite.Run(t, new(ProxyProtoSuite))
+}

tests/e2e/quic_test.go

@@ -0,0 +1,135 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// QUICSuite covers the QUIC listener/dialer pair (listener type: quic, dialer
+// type: quic) with the cipherKey obfuscation enabled. It uses the canonical
+// GOST chaining pattern: a client container exposes a plain HTTP proxy that
+// tunnels through a quic chain to a quic server (HTTP over QUIC).
+type QUICSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+}
+
+func (s *QUICSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	s.T().Logf("start tcp echo container...")
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *QUICSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// startChain brings up a quic server (alias "quic-server", cipherKey enabled,
+// http handler) and a client container that chains to it through a quic
+// dialer. The client exposes port 8080 for curl.
+func (s *QUICSuite) startChain() (testcontainers.Container, testcontainers.Container) {
+	s.T().Helper()
+
+	serverC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/quic/server.yaml", []string{"quic-server"}, []string{"18843/udp"})
+	s.Require().NoError(err)
+
+	rendered, err := RenderConfig("testdata/quic/client.yaml", ConfigData{ServerAddr: "quic-server:18843"})
+	s.Require().NoError(err)
+	s.T().Cleanup(func() { os.Remove(rendered) })
+
+	clientC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, rendered, "8080/tcp")
+	s.Require().NoError(err)
+
+	return serverC, clientC
+}
+
+// curlEcho runs curl through the client's local http proxy and returns the
+// exit code plus the captured body.
+func (s *QUICSuite) curlEcho(clientC testcontainers.Container) (int, string) {
+	s.T().Helper()
+	cmd := []string{"curl", "-s", "--max-time", "20", "-x", "http://127.0.0.1:8080",
+		fmt.Sprintf("http://%s:5678/", s.echoIP)}
+	code, out, _ := clientC.Exec(s.ctx, cmd)
+	body, _ := io.ReadAll(out)
+	return code, string(body)
+}
+
+// sendInvalidDatagram sends a single malformed (non-encrypted) UDP datagram to
+// the quic server's listener, reproducing the issue's repro packet.
+func (s *QUICSuite) sendInvalidDatagram(clientC testcontainers.Container) {
+	s.T().Helper()
+	cmd := []string{"python3", "-c",
+		"import socket; s=socket.socket(socket.AF_INET, socket.SOCK_DGRAM); s.sendto(b\"x\", (\"quic-server\", 18843))"}
+	code, out, err := clientC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	if code != 0 {
+		b, _ := io.ReadAll(out)
+		s.T().Fatalf("send invalid datagram failed (%d): %s", code, string(b))
+	}
+}
+
+// TestQUICForwardCipherKeySurvivesInvalidDatagram verifies that a malformed
+// UDP datagram does not close the shared QUIC transport (go-gost/x#125).
+//
+// With the bug, cipherConn.ReadFrom returned the decrypt error straight to
+// quic-go, which treats any packet-socket error as fatal and closes the shared
+// transport: a single invalid datagram kills the listener and correct clients
+// subsequently time out. With the fix the invalid datagram is discarded and
+// the listener keeps serving.
+//
+// Sequence: baseline forward works -> malformed datagram -> forward still works.
+func (s *QUICSuite) TestQUICForwardCipherKeySurvivesInvalidDatagram() {
+	serverC, clientC := s.startChain()
+	defer serverC.Terminate(s.ctx)
+	defer clientC.Terminate(s.ctx)
+
+	// Baseline: a valid QUIC forward must work before we poke the listener.
+	code, body := s.curlEcho(clientC)
+	if code != 0 || !strings.Contains(body, "hello-gost") {
+		s.dump("quic-baseline logs", clientC, serverC)
+	}
+	s.Require().Equal(0, code, "baseline QUIC forward should work")
+	s.Require().Contains(body, "hello-gost")
+
+	// Send one malformed UDP datagram to the quic listener's cipher socket.
+	s.sendInvalidDatagram(clientC)
+
+	// The listener must still be alive: a fresh QUIC forward must succeed.
+	code, body = s.curlEcho(clientC)
+	if code != 0 || !strings.Contains(body, "hello-gost") {
+		s.dump("quic-after-invalid logs", clientC, serverC)
+	}
+	s.Require().Equal(0, code,
+		"QUIC forward should still work after an invalid datagram (issue #125)")
+	s.Require().Contains(body, "hello-gost",
+		"listener must not close on an invalid datagram (issue #125)")
+}
+
+func (s *QUICSuite) dump(label string, cs ...testcontainers.Container) {
+	for _, c := range cs {
+		DumpLogs(s.T(), s.ctx, fmt.Sprintf("%s: %s", label, c.GetContainerID()), c)
+	}
+}
+
+func TestQUICSuite(t *testing.T) {
+	suite.Run(t, new(QUICSuite))
+}

tests/e2e/red_sniffing_whitelist_test.go

@@ -0,0 +1,139 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/moby/moby/client"
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/wait"
+)
+
+// RedSniffingWhitelistSuite reproduces go-gost/gost#899: whitelist bypass +
+// sniffing on a transparent (red) proxy.
+//
+// Inside a single privileged container, iptables redirects all outbound TCP to
+// the gost red service, so the handler sees the original destination IP via
+// SO_ORIGINAL_DST. The whitelist contains only a domain (the docker network
+// alias "https-echo"); a bare destination IP is never in it. On a broken build
+// (go-gost/x@fe394a8, x >= v0.13.12) the pre-sniffing bypass check on the
+// destination IP rejects every connection before SNI sniffing runs, making the
+// domain whitelist dead. The fix skips that check in whitelist mode and lets
+// the sniffer match the SNI host. This suite also asserts the security
+// property the skip must not weaken: a non-whitelisted SNI is still rejected.
+type RedSniffingWhitelistSuite struct {
+	suite.Suite
+	ctx        context.Context
+	httpsEchoC testcontainers.Container
+	gostC      testcontainers.Container
+}
+
+// redirectRules are installed in the gost container before gost starts:
+// loopback traffic (incl. Docker's embedded DNS) and gost's own marked sockets
+// are exempt; every other TCP packet is redirected to the red service.
+const redirectRules = `
+iptables -t nat -A OUTPUT -m addrtype --dst-type LOCAL -j RETURN
+iptables -t nat -A OUTPUT -m mark --mark 114514 -j RETURN
+iptables -t nat -A OUTPUT -p tcp -j REDIRECT --to-ports 12345
+`
+
+func (s *RedSniffingWhitelistSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunHTTPSEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.httpsEchoC = echoC
+
+	req := testcontainers.ContainerRequest{
+		FromDockerfile: testcontainers.FromDockerfile{
+			Context:    ".",
+			Dockerfile: "Dockerfile",
+			Repo:       "gost-e2e",
+			Tag:        "latest",
+			KeepImage:  true,
+			BuildOptionsModifier: func(opts *client.ImageBuildOptions) {
+				opts.NetworkMode = "host"
+			},
+		},
+		Networks: []string{SharedNetworkName},
+		CapAdd:   []string{"NET_ADMIN"},
+		Files: []testcontainers.ContainerFile{
+			{HostFilePath: GostBinPath, ContainerFilePath: "/bin/gost", FileMode: 0755},
+			{HostFilePath: "testdata/red_sniffing/whitelist.yaml", ContainerFilePath: "/config.yaml", FileMode: 0644},
+		},
+		Cmd:        []string{"sh", "-c", redirectRules + "\nexec /bin/gost -C /config.yaml"},
+		WaitingFor: wait.ForLog("listening on"),
+	}
+
+	gostC, err := testcontainers.GenericContainer(s.ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+	s.Require().NoError(err)
+	s.gostC = gostC
+}
+
+func (s *RedSniffingWhitelistSuite) TearDownSuite() {
+	if s.gostC != nil {
+		s.gostC.Terminate(s.ctx)
+	}
+	if s.httpsEchoC != nil {
+		s.httpsEchoC.Terminate(s.ctx)
+	}
+}
+
+// TestWhitelistedDomainViaSNI is the gost#899 golden path: curl to a domain in
+// the whitelist should be forwarded because the sniffer matches its SNI. The
+// kernel redirects the outbound TCP to the red service, which must not reject
+// the bare destination IP before sniffing. Retries tolerate startup timing.
+func (s *RedSniffingWhitelistSuite) TestWhitelistedDomainViaSNI() {
+	s.T().Helper()
+	cmd := []string{"sh", "-c", `
+for i in $(seq 1 30); do
+  body=$(curl -ks --max-time 5 https://https-echo:8443/ 2>/dev/null)
+  echo "$body" | grep -q hello-gost && { echo "$body"; exit 0; }
+  sleep 1
+done
+echo "$body"`}
+	_, out, err := s.gostC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	body, _ := io.ReadAll(out)
+
+	if !strings.Contains(string(body), "hello-gost") {
+		DumpLogs(s.T(), s.ctx, "gost-red logs", s.gostC)
+	}
+	s.Require().Contains(string(body), "hello-gost",
+		"whitelisted domain must be forwarded via SNI, not rejected on the bare IP")
+}
+
+// TestNonWhitelistedHostRejected verifies that skipping the pre-sniffing check
+// in whitelist mode does not weaken the whitelist: a connection whose sniffed
+// SNI is not allowlisted must still be rejected. curl connects to the same
+// echo IP but with a different SNI, so only the SNI can drive the decision.
+func (s *RedSniffingWhitelistSuite) TestNonWhitelistedHostRejected() {
+	s.T().Helper()
+	ip, err := s.httpsEchoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+
+	cmd := []string{"sh", "-c", fmt.Sprintf(
+		"curl -ks --resolve other.test:8443:%s --max-time 5 https://other.test:8443/ 2>&1", ip)}
+	code, _, err := s.gostC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	s.Require().NotZero(code,
+		"curl to a non-whitelisted SNI should fail; got exit %d", code)
+
+	logs, err := s.gostC.Logs(s.ctx)
+	s.Require().NoError(err)
+	defer logs.Close()
+	logBody, _ := io.ReadAll(logs)
+	s.Require().Contains(string(logBody), "bypass:",
+		"gost should log a bypass decision for the non-whitelisted SNI")
+}
+
+func TestRedSniffingWhitelistSuite(t *testing.T) {
+	suite.Run(t, new(RedSniffingWhitelistSuite))
+}

tests/e2e/resolver_test.go

@@ -0,0 +1,91 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// ResolverSuite verifies that a configured resolver drives the proxy's
+// outbound DNS resolution. A gost HTTP proxy uses a resolver whose only
+// nameserver is a test responder: it answers echo.test with the real echo
+// server IP and NXDOMAIN for everything else. A request to echo.test is
+// resolved by the custom resolver and reaches the echo server; a request to an
+// unmapped host fails to resolve.
+type ResolverSuite struct {
+	suite.Suite
+	ctx     context.Context
+	echoC   testcontainers.Container
+	echoIP  string
+	dnsC    testcontainers.Container
+	proxyC  testcontainers.Container
+}
+
+func (s *ResolverSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+
+	dnsC, err := RunResolverResponderContainer(s.ctx, SharedNetworkName, s.echoIP)
+	s.Require().NoError(err)
+	s.dnsC = dnsC
+
+	proxyC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/resolver/server.yaml", []string{"gost-proxy"}, []string{"8080/tcp"})
+	s.Require().NoError(err)
+	s.proxyC = proxyC
+}
+
+func (s *ResolverSuite) TearDownSuite() {
+	for _, c := range []testcontainers.Container{s.proxyC, s.dnsC, s.echoC} {
+		if c != nil {
+			c.Terminate(s.ctx)
+		}
+	}
+}
+
+// proxyRequest sends an HTTP GET to the given host through the gost proxy. When
+// waitResolve is true it retries until the resolver/responder is ready (the
+// resolved-host happy path); otherwise it makes a single attempt. Returns the
+// response body.
+func (s *ResolverSuite) proxyRequest(host string, waitResolve bool) string {
+	loop := "for i in $(seq 1 30); do "
+	if !waitResolve {
+		loop = "for i in 1; do "
+	}
+	cmd := []string{
+		"sh", "-c",
+		fmt.Sprintf("%sbody=$(curl -s -x http://gost-proxy:8080 http://%s:5678/); echo \"$body\" | grep -q hello-gost && { echo \"$body\"; exit 0; }; sleep 1; done; echo \"$body\"", loop, host),
+	}
+	_, out, err := s.echoC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+// TestResolvedHostname verifies that the custom resolver resolves echo.test to
+// the echo server IP, so the proxied request reaches the echo server.
+func (s *ResolverSuite) TestResolvedHostname() {
+	s.Require().Contains(s.proxyRequest("echo.test", true), "hello-gost")
+}
+
+// TestUnresolvedHostname verifies that a host absent from the resolver gets
+// NXDOMAIN and never reaches the echo server.
+func (s *ResolverSuite) TestUnresolvedHostname() {
+	s.Require().NotContains(s.proxyRequest("nomapped.test", false), "hello-gost")
+}
+
+func TestResolverSuite(t *testing.T) {
+	suite.Run(t, new(ResolverSuite))
+}

tests/e2e/routing_test.go

@@ -0,0 +1,81 @@
+package e2e
+
+import (
+	"context"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// RoutingSuite verifies node-level routing matchers. A forward proxy's only
+// chain node relays to an upstream proxy, but the node carries a matcher
+// Host(`tcp-echo`) so it is only eligible for requests whose Host matches. A
+// request to tcp-echo:5678 is matched, relayed upstream, and reaches the echo
+// server ("hello-gost"); a request to a non-matching host is excluded (no
+// eligible node) and never reaches the echo server.
+type RoutingSuite struct {
+	suite.Suite
+	ctx        context.Context
+	echoC      testcontainers.Container
+	proxyC     testcontainers.Container
+	upstreamC  testcontainers.Container
+}
+
+func (s *RoutingSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	proxyC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/routing/server.yaml", []string{"gost-proxy"}, []string{"8080/tcp"})
+	s.Require().NoError(err)
+	s.proxyC = proxyC
+
+	upstreamC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/routing/upstream.yaml", []string{"gost-upstream"}, []string{"8081/tcp"})
+	s.Require().NoError(err)
+	s.upstreamC = upstreamC
+}
+
+func (s *RoutingSuite) TearDownSuite() {
+	for _, c := range []testcontainers.Container{s.proxyC, s.upstreamC, s.echoC} {
+		if c != nil {
+			c.Terminate(s.ctx)
+		}
+	}
+}
+
+// proxyRequest sends an HTTP GET to target through the matcher-gated proxy and
+// returns the response body.
+func (s *RoutingSuite) proxyRequest(target string) string {
+	cmd := []string{
+		"curl", "-s",
+		"-x", "http://gost-proxy:8080",
+		target,
+	}
+	_, out, err := s.echoC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+// TestMatchedHost verifies that a request whose Host matches the node matcher is
+// relayed upstream and reaches the echo server.
+func (s *RoutingSuite) TestMatchedHost() {
+	s.Require().Contains(s.proxyRequest("http://tcp-echo:5678/"), "hello-gost")
+}
+
+// TestUnmatchedHost verifies that a request whose Host does not match the node
+// matcher is excluded (no eligible node) and never reaches the echo server.
+func (s *RoutingSuite) TestUnmatchedHost() {
+	s.Require().NotContains(s.proxyRequest("http://other.local:5678/"), "hello-gost")
+}
+
+func TestRoutingSuite(t *testing.T) {
+	suite.Run(t, new(RoutingSuite))
+}

tests/e2e/rtcpfilter_test.go

@@ -0,0 +1,85 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// RTCPFilterSuite reproduces go-gost/gost#898: multiple TCP services sharing
+// ONE tunnel ID, routed at the client (rtcp) side by forwarder.nodes[].filter.host.
+//
+// The server ingress maps two hostnames to the same tunnel endpoint. The client
+// rtcp service has two forwarder nodes, both filtered by host, with NO fallback
+// node. When the hostname is correctly propagated through the tunnel, a request
+// for example.local is routed to the example node (tcp-echo:5678). When the
+// hostname is lost (the regression), neither node matches and the connection
+// fails with "node not available".
+type RTCPFilterSuite struct {
+	suite.Suite
+	ctx     context.Context
+	echoC   testcontainers.Container
+	serverC testcontainers.Container
+	clientC testcontainers.Container
+}
+
+func (s *RTCPFilterSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	serverC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/rtcpfilter/server.yaml", []string{"gost-server"}, []string{"8420/tcp"})
+	s.Require().NoError(err)
+	s.serverC = serverC
+
+	clientC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/rtcpfilter/client.yaml", []string{"gost-client"}, []string{"8423/tcp"})
+	s.Require().NoError(err)
+	s.clientC = clientC
+}
+
+func (s *RTCPFilterSuite) TearDownSuite() {
+	for _, c := range []testcontainers.Container{s.clientC, s.serverC, s.echoC} {
+		if c != nil {
+			c.Terminate(s.ctx)
+		}
+	}
+}
+
+// request sends an HTTP GET to the server entrypoint with the given Host
+// header, retrying until the reverse tunnel is bound. Returns the response body.
+func (s *RTCPFilterSuite) request(host string) string {
+	cmd := []string{
+		"sh", "-c",
+		fmt.Sprintf("for i in $(seq 1 30); do body=$(curl -s -H 'Host: %s' http://gost-server:8420/); echo \"$body\" | grep -q hello-gost && { echo \"$body\"; exit 0; }; sleep 1; done; echo \"$body\"", host),
+	}
+	_, out, err := s.echoC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return string(body)
+}
+
+// TestMappedHostnameFiltered verifies that a Host matching a filter.host node is
+// routed through the tunnel to that node's backend. This is the gost#898 failure:
+// with the regression, the hostname is dropped and no node matches.
+func (s *RTCPFilterSuite) TestMappedHostnameFiltered() {
+	body := s.request("example.local")
+	if !strings.Contains(body, "hello-gost") {
+		DumpLogs(s.T(), s.ctx, "rtcp client logs", s.clientC)
+		DumpLogs(s.T(), s.ctx, "tunnel server logs", s.serverC)
+	}
+	s.Require().Contains(body, "hello-gost")
+}
+
+func TestRTCPFilterSuite(t *testing.T) {
+	suite.Run(t, new(RTCPFilterSuite))
+}

tests/e2e/rudpbind_test.go

@@ -0,0 +1,147 @@
+package e2e
+
+import (
+	"context"
+	"io"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// RUDPBindSuite reproduces go-gost/gost#911: concurrent UDP source sockets
+// sharing ONE reverse UDP tunnel over a relay server.
+//
+// Topology (all three gost processes plus a UDP echo server):
+//
+//	UDP source sockets (N) -> client udp service -> relay server
+//	  -> reverse-bound UDP port -> host rudp listener (ONE shared stream)
+//	  -> udp-echo
+//
+// A datagram frame is written to that shared stream as three separate Write
+// calls (RSV/FRAG, SOCKS5 address, payload). Before the fix, with N endpoints
+// writing concurrently, frames interleaved between those calls: replies came
+// back corrupted, and a torn frame left half a header in the stream, which the
+// far end read as "unexpected EOF" and answered by tearing down and rebinding
+// the whole reverse tunnel every second.
+//
+// The host is the side that binds the tunnel, so its log is where a reset
+// shows up as "unexpected EOF, retrying in 1s" followed by a rebind.
+type RUDPBindSuite struct {
+	suite.Suite
+	ctx     context.Context
+	udpC    testcontainers.Container
+	serverC testcontainers.Container
+	hostC   testcontainers.Container
+	clientC testcontainers.Container
+}
+
+func (s *RUDPBindSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	udpC, err := RunUDPEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.udpC = udpC
+
+	serverC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/rudpbind/server.yaml", []string{"gost-server"}, []string{"8430/tcp"})
+	s.Require().NoError(err)
+	s.serverC = serverC
+
+	// The host's rudp listener opens no local port, so it exposes a dummy TCP
+	// port (service-1) purely for the readiness wait.
+	hostC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/rudpbind/host.yaml", []string{"gost-host"}, []string{"8431/tcp"})
+	s.Require().NoError(err)
+	s.hostC = hostC
+
+	clientC, err := RunGostContainerWithFiles(s.ctx, SharedNetworkName,
+		"testdata/rudpbind/client.yaml",
+		[]testcontainers.ContainerFile{
+			{HostFilePath: "scripts/udp_rudp_concurrent.py", ContainerFilePath: "/scripts/udp_rudp_concurrent.py", FileMode: 0644},
+		})
+	s.Require().NoError(err)
+	s.clientC = clientC
+
+	// The reverse tunnel binds remotely on first traffic, not at startup.
+	up := assert.Eventually(s.T(), func() bool {
+		out := s.sendConcurrent(1, 1)
+		if !strings.Contains(out, "PASS") {
+			s.T().Logf("waiting for tunnel, sender said:\n%s", out)
+		}
+		return out != "" && strings.Contains(out, "PASS")
+	}, 30*time.Second, time.Second, "reverse UDP tunnel never came up")
+	if !up {
+		DumpLogs(s.T(), s.ctx, "host logs", s.hostC)
+		DumpLogs(s.T(), s.ctx, "server logs", s.serverC)
+		DumpLogs(s.T(), s.ctx, "client logs", s.clientC)
+		s.FailNow("reverse UDP tunnel never came up")
+	}
+}
+
+func (s *RUDPBindSuite) TearDownSuite() {
+	for _, c := range []testcontainers.Container{s.clientC, s.hostC, s.serverC, s.udpC} {
+		if c != nil {
+			c.Terminate(s.ctx)
+		}
+	}
+}
+
+// sendConcurrent runs the concurrent sender inside the client container and
+// returns its combined stdout+stderr.
+func (s *RUDPBindSuite) sendConcurrent(endpoints, seconds int) string {
+	cmd := []string{
+		"python3", "/scripts/udp_rudp_concurrent.py",
+		// The client service listens in this same container, so loopback is the
+		// correct target — no network alias needed for the sender.
+		"127.0.0.1", "8432",
+		strconv.Itoa(endpoints), strconv.Itoa(seconds),
+	}
+	_, out, err := s.clientC.Exec(s.ctx, cmd)
+	if err != nil {
+		return ""
+	}
+	var sb strings.Builder
+	buf := make([]byte, 4096)
+	for {
+		n, err := out.Read(buf)
+		sb.Write(buf[:n])
+		if err != nil {
+			break
+		}
+	}
+	return sb.String()
+}
+
+// TestConcurrentEndpointsShareTunnel is the regression assertion: several UDP
+// source sockets sharing one reverse tunnel must each get their own datagrams
+// back unchanged, and the tunnel must not be rebuilt underneath them.
+func (s *RUDPBindSuite) TestConcurrentEndpointsShareTunnel() {
+	out := s.sendConcurrent(4, 8)
+	s.T().Logf("concurrent send:\n%s", out)
+
+	if strings.Contains(out, "FAIL") {
+		DumpLogs(s.T(), s.ctx, "host logs", s.hostC)
+		DumpLogs(s.T(), s.ctx, "server logs", s.serverC)
+	}
+	s.Require().Contains(out, "PASS", "concurrent endpoints over one reverse tunnel failed:\n%s", out)
+
+	// Belt and braces: the host log is where the reset appears directly.
+	hostLogs, err := s.hostC.Logs(s.ctx)
+	if err == nil {
+		body, readErr := io.ReadAll(hostLogs)
+		hostLogs.Close()
+		if readErr == nil {
+			s.Require().NotContains(string(body), "unexpected EOF",
+				"reverse tunnel was torn down while endpoints were sending")
+		}
+	}
+}
+
+func TestRUDPBindSuite(t *testing.T) {
+	suite.Run(t, new(RUDPBindSuite))
+}

tests/e2e/scripts/auth_plugin.py

@@ -0,0 +1,27 @@
+import http.server
+import json
+import sys
+
+
+class AuthHandler(http.server.BaseHTTPRequestHandler):
+    def do_POST(self):
+        length = int(self.headers.get('Content-Length', 0))
+        body = self.rfile.read(length)
+        data = json.loads(body)
+        print(f"AUTH_REQUEST: {json.dumps(data)}", flush=True)
+        self.send_response(200)
+        self.send_header("Content-Type", "application/json")
+        self.end_headers()
+        self.wfile.write(
+            json.dumps(
+                {"ok": True, "id": data.get("username", "anonymous")}
+            ).encode()
+        )
+
+    def log_message(self, format, *args):
+        pass  # silence default logging, we use our own AUTH_REQUEST line
+
+
+if __name__ == "__main__":
+    port = int(sys.argv[1]) if len(sys.argv) > 1 else 9000
+    http.server.HTTPServer(("0.0.0.0", port), AuthHandler).serve_forever()

tests/e2e/scripts/dns_resolver_responder.py

@@ -0,0 +1,74 @@
+"""DNS responder for resolver e2e tests.
+
+Returns the target IP (argv[1]) for an A query of "echo.test" and
+NXDOMAIN for every other query. This lets a gost proxy configured with
+this server as its resolver resolve a made-up hostname to a reachable
+echo server, proving the resolver drives outbound dialing.
+
+Listens on UDP port argv[2] (default 5353).
+"""
+import socketserver
+import struct
+import socket
+import sys
+
+TARGET_IP = sys.argv[1] if len(sys.argv) > 1 else "10.0.0.1"
+PORT = int(sys.argv[2]) if len(sys.argv) > 2 else 5353
+MATCH_NAME = "echo.test"
+
+
+def decode_name(data, offset):
+    labels = []
+    while True:
+        length = data[offset]
+        if length == 0:
+            offset += 1
+            break
+        if length & 0xC0:
+            offset += 2
+            break
+        offset += 1
+        labels.append(data[offset:offset + length].decode())
+        offset += length
+    return '.'.join(labels), offset
+
+
+class DNSResponder(socketserver.DatagramRequestHandler):
+    def handle(self):
+        data = self.rfile.read(512)
+        if len(data) < 12:
+            return
+
+        tid = struct.unpack(">H", data[:2])[0]
+        qdcount = struct.unpack(">H", data[4:6])[0]
+        if qdcount == 0:
+            return
+
+        qname, pos = decode_name(data, 12)
+        qtype = struct.unpack(">H", data[pos:pos + 2])[0]
+        qclass = struct.unpack(">H", data[pos + 2:pos + 4])[0]
+
+        if qname == MATCH_NAME and qtype == 1:
+            rcode, ancount = 0, 1
+            rtype, ttl, rdata = 1, 300, socket.inet_aton(TARGET_IP)
+        else:
+            rcode, ancount = 3, 0  # NXDOMAIN
+            rtype, ttl, rdata = 0, 0, b""
+
+        flags = 0x8000 | 0x0400 | rcode  # QR=1, AA=1, rcode
+        header = struct.pack(">HHHHHH", tid, flags, qdcount, ancount, 0, 0)
+        question = data[12:pos + 4]
+        answer = b""
+        if ancount:
+            answer = (
+                struct.pack(">HH", 0xC00C, rtype)  # NAME pointer + TYPE
+                + struct.pack(">HI", qclass, ttl)   # CLASS + TTL
+                + struct.pack(">H", len(rdata)) + rdata  # RDLENGTH + RDATA
+            )
+        self.wfile.write(header + question + answer)
+
+
+if __name__ == "__main__":
+    socketserver.ThreadingUDPServer.allow_reuse_address = True
+    with socketserver.ThreadingUDPServer(("0.0.0.0", PORT), DNSResponder) as srv:
+        srv.serve_forever()

tests/e2e/scripts/echo754_repro.py

@@ -0,0 +1,22 @@
+import socket, threading
+
+s = socket.socket()
+s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+s.bind(("127.0.0.1", 15738))
+s.listen(50)
+
+def loop(c):
+    try:
+        while True:
+            d = c.recv(65536)
+            if not d:
+                break
+            c.sendall(d)
+    except OSError:
+        pass
+    finally:
+        c.close()
+
+while True:
+    c, _ = s.accept()
+    threading.Thread(target=loop, args=(c,), daemon=True).start()

tests/e2e/scripts/http_cache_backend.py

@@ -0,0 +1,20 @@
+from http.server import BaseHTTPRequestHandler, HTTPServer
+
+_counter = 0
+
+
+class Handler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        global _counter
+        _counter += 1
+        body = b"cache-test-%d" % _counter
+        self.send_response(200)
+        self.send_header("Content-Length", str(len(body)))
+        self.end_headers()
+        self.wfile.write(body)
+
+    def log_message(self, format, *args):
+        return
+
+
+HTTPServer(("0.0.0.0", 5677), Handler).serve_forever()

tests/e2e/scripts/http_cache_servestale_backend.py

@@ -0,0 +1,46 @@
+from http.server import BaseHTTPRequestHandler, HTTPServer
+import socket
+import threading
+
+_counter = 0
+_http_server = None
+
+
+class Handler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        global _counter
+        _counter += 1
+        body = b"cache-test-%d" % _counter
+        self.send_response(200)
+        self.send_header("Content-Length", str(len(body)))
+        self.send_header("Connection", "close")
+        self.end_headers()
+        self.wfile.write(body)
+        threading.Thread(target=stop_server, daemon=True).start()
+
+    def log_message(self, format, *args):
+        return
+
+
+def stop_server():
+    global _http_server
+    if _http_server:
+        _http_server.shutdown()
+        _http_server.server_close()
+
+
+def start_raw_acceptor():
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    sock.bind(("0.0.0.0", 5676))
+    sock.listen(5)
+    while True:
+        conn, addr = sock.accept()
+        conn.close()
+
+
+_http_server = HTTPServer(("0.0.0.0", 5676), Handler)
+_http_server.serve_forever()
+_http_server.server_close()
+
+start_raw_acceptor()

tests/e2e/scripts/http_status_backend.py

@@ -0,0 +1,35 @@
+"""HTTP server that always returns a fixed status code."""
+import sys
+from http.server import BaseHTTPRequestHandler, HTTPServer
+
+
+STATUS = int(sys.argv[1]) if len(sys.argv) > 1 else 429
+PORT = int(sys.argv[2]) if len(sys.argv) > 2 else 5680
+BODY = f"status-{STATUS}".encode()
+
+
+class Handler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        self.send_response(STATUS)
+        self.send_header("Content-Length", str(len(BODY)))
+        self.end_headers()
+        self.wfile.write(BODY)
+
+    def do_POST(self):
+        self.send_response(STATUS)
+        self.send_header("Content-Length", str(len(BODY)))
+        self.end_headers()
+        self.wfile.write(BODY)
+
+    # HTTP proxy CONNECT method
+    def do_CONNECT(self):
+        self.send_response(STATUS)
+        self.send_header("Content-Length", str(len(BODY)))
+        self.end_headers()
+        self.wfile.write(BODY)
+
+    def log_message(self, format, *args):
+        return
+
+
+HTTPServer(("0.0.0.0", PORT), Handler).serve_forever()

tests/e2e/scripts/https_echo.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+import os
+import subprocess
+import ssl
+from http.server import BaseHTTPRequestHandler, HTTPServer
+
+PORT = int(os.environ.get("PORT", "8443"))
+
+cert_dir = "/tmp/certs"
+os.makedirs(cert_dir, exist_ok=True)
+cert_file = os.path.join(cert_dir, "cert.pem")
+key_file = os.path.join(cert_dir, "key.pem")
+
+if not os.path.exists(cert_file) or not os.path.exists(key_file):
+    subprocess.run(
+        [
+            "openssl", "req", "-x509", "-newkey", "rsa:2048",
+            "-keyout", key_file, "-out", cert_file,
+            "-days", "365", "-nodes",
+            "-subj", "/CN=localhost",
+        ],
+        check=True,
+    )
+
+
+class Handler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        body = b"hello-gost"
+        self.send_response(200)
+        self.send_header("Content-Length", str(len(body)))
+        self.end_headers()
+        self.wfile.write(body)
+
+    def log_message(self, format, *args):
+        return
+
+
+server = HTTPServer(("0.0.0.0", PORT), Handler)
+ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
+ctx.load_cert_chain(cert_file, key_file)
+server.socket = ctx.wrap_socket(server.socket, server_side=True)
+server.serve_forever()

tests/e2e/scripts/proxy_capture.py

@@ -0,0 +1,23 @@
+# Raw-TCP backend for the PROXY-protocol e2e test (issue #677).
+# Reads the first bytes of each connection and reflects whether a HAProxy
+# PROXY protocol header was prepended by gost:
+#   - v1 ("PROXY TCP4 ...")  -> "PROXY-RECEIVED: PROXY TCP4 ..."
+#   - v2 (12-byte signature)  -> "PROXY-V2-RECEIVED"
+#   - neither                  -> "NO-PROXY"
+import socket
+
+s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+s.bind(("0.0.0.0", 5678))
+s.listen(5)
+
+while True:
+    c, _ = s.accept()
+    d = c.recv(4096)
+    if d[:12] == b"\r\n\r\n\x00\r\nQUIT\n":
+        c.sendall(b"PROXY-V2-RECEIVED\n")
+    elif d[:6] == b"PROXY ":
+        c.sendall(b"PROXY-RECEIVED: " + d.split(b"\r\n", 1)[0] + b"\n")
+    else:
+        c.sendall(b"NO-PROXY\n")
+    c.close()

tests/e2e/scripts/udp_quic_forward_test.py

@@ -0,0 +1,35 @@
+import socket
+import sys
+import base64
+
+
+# QUIC v1 Initial packet (captured from real traffic, SNI=cloudflare-quic.com).
+# Used to verify that the GOST proxy correctly sniffs and forwards QUIC traffic.
+QUIC_PKT_B64 = "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"
+
+
+def main():
+    host = sys.argv[1] if len(sys.argv) > 1 else "127.0.0.1"
+    port = int(sys.argv[2]) if len(sys.argv) > 2 else 9000
+
+    pkt = base64.b64decode(QUIC_PKT_B64)
+
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    sock.settimeout(10)
+
+    sock.sendto(pkt, (host, port))
+
+    data, addr = sock.recvfrom(4096)
+    if len(data) == len(pkt):
+        print(f"PASS: received {len(data)} bytes (echo matches)")
+        sys.exit(0)
+    elif len(data) > 0:
+        print(f"PARTIAL: sent {len(pkt)}, received {len(data)} bytes")
+        sys.exit(0)
+    else:
+        print("FAIL: no response")
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()

tests/e2e/scripts/udp_rudp_concurrent.py

@@ -0,0 +1,105 @@
+"""Concurrent UDP sender for the gost#911 reverse-tunnel regression test.
+
+Each socket is an independent source endpoint sharing ONE reverse tunnel
+stream. Every datagram is a run of its own endpoint id, so a reply that does
+not match the id byte exactly is a frame corrupted by an interleaved writer
+rather than plain loss.
+
+Usage: udp_rudp_concurrent.py <host> <port> <count> <duration_seconds>
+"""
+
+import socket
+import sys
+import threading
+import time
+
+
+def main():
+    host = sys.argv[1]
+    port = int(sys.argv[2])
+    count = int(sys.argv[3])
+    duration = float(sys.argv[4])
+
+    payload_len = 1200
+    end = time.monotonic() + duration
+    results = {}
+    lock = threading.Lock()
+
+    def endpoint(endpoint_id):
+        payload = bytes([endpoint_id]) * payload_len
+        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        sock.bind(("0.0.0.0", 0))
+        sock.settimeout(0.2)
+
+        sent = received = damaged = 0
+        largest_gap = 0.0
+        last = time.monotonic()
+
+        while time.monotonic() < end:
+            try:
+                sock.sendto(payload, (host, port))
+                sent += 1
+            except OSError:
+                pass
+            while True:
+                try:
+                    data, _ = sock.recvfrom(65535)
+                except socket.timeout:
+                    break
+                except OSError:
+                    break
+                received += 1
+                if data != payload:
+                    damaged += 1
+                now = time.monotonic()
+                largest_gap = max(largest_gap, now - last)
+                last = now
+
+        largest_gap = max(largest_gap, time.monotonic() - last)
+        with lock:
+            results[endpoint_id] = (sent, received, damaged, round(largest_gap, 3))
+        sock.close()
+
+    threads = [
+        threading.Thread(target=endpoint, args=(i + 1,)) for i in range(count)
+    ]
+    for t in threads:
+        t.start()
+    for t in threads:
+        t.join()
+
+    failures = []
+    for endpoint_id in sorted(results):
+        sent, received, damaged, gap = results[endpoint_id]
+        loss_pct = 100.0 * (1.0 - received / sent) if sent else 100.0
+        print(
+            f"endpoint {endpoint_id}: sent={sent} received={received} "
+            f"damaged={damaged} loss={loss_pct:.1f}% max_gap={gap}"
+        )
+        # Unsent datagrams are outside our control (the UDP socket's own
+        # buffer); anything that comes BACK must be byte-identical.
+        if damaged:
+            failures.append(
+                f"endpoint {endpoint_id}: {damaged} datagram(s) came back "
+                f"corrupted — frames interleaved on the shared tunnel stream"
+            )
+        # A torn frame makes the far end read io.ErrUnexpectedEOF, which
+        # rebuilds the whole reverse tunnel. That shows up as a receive gap of
+        # seconds, not milliseconds.
+        if gap >= 1.0:
+            failures.append(
+                f"endpoint {endpoint_id}: {gap}s receive gap — the reverse "
+                f"tunnel was torn down and rebound under active traffic"
+            )
+
+    if failures:
+        for f in failures:
+            print(f"FAIL: {f}", file=sys.stderr)
+        sys.exit(1)
+
+    print(f"PASS: {count} concurrent endpoints, no corruption, no tunnel reset")
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()

tests/e2e/selector_test.go

@@ -0,0 +1,114 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+type SelectorSuite struct {
+	suite.Suite
+	ctx    context.Context
+	echoC  testcontainers.Container
+	echoIP string
+}
+
+func (s *SelectorSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *SelectorSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+}
+
+// proxyRequest sends one request through the gost proxy and returns the curl
+// exit code and response body.
+func (s *SelectorSuite) proxyRequest(gostC testcontainers.Container, port string) (int, string) {
+	cmd := []string{
+		"curl", "-s",
+		"-x", fmt.Sprintf("http://127.0.0.1:%s", port),
+		fmt.Sprintf("http://%s:5678", s.echoIP),
+	}
+	code, out, err := gostC.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+
+	body, err := io.ReadAll(out)
+	s.Require().NoError(err)
+	return code, string(body)
+}
+
+// runFailover starts a gost container from cfg and verifies that, despite a
+// dead node in the hop, requests converge to the live node after the selector
+// marks the dead node and skips it. At most the initial marking attempt may
+// fail; every request after must reach the echo server.
+func (s *SelectorSuite) runFailover(cfg, port string) {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, cfg, port+"/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	const n = 12
+	var failures int
+	lastOK := false
+	for range n {
+		code, body := s.proxyRequest(gostC, port)
+		ok := code == 0 && strings.Contains(body, "hello-gost")
+		if !ok {
+			failures++
+		}
+		lastOK = ok
+	}
+
+	s.Require().LessOrEqual(failures, 1,
+		"selector did not filter the dead node; too many requests failed")
+	s.Require().True(lastOK, "requests did not converge to the live node")
+}
+
+// TestRoundRobinFailover exercises the round-robin strategy combined with the
+// fail filter: the dead node is tried once, marked, and then skipped.
+func (s *SelectorSuite) TestRoundRobinFailover() {
+	s.runFailover("testdata/selector/roundrobin.yaml", "8080")
+}
+
+// TestFIFOFailover exercises the fifo (sticky) strategy: it always picks the
+// first node until it fails, then falls through to the secondary node.
+func (s *SelectorSuite) TestFIFOFailover() {
+	s.runFailover("testdata/selector/fifo.yaml", "8080")
+}
+
+// TestBackupFailover exercises the backup filter: with the primary node dead,
+// the selector falls back to the backup node.
+func (s *SelectorSuite) TestBackupFailover() {
+	s.runFailover("testdata/selector/backup.yaml", "8080")
+}
+
+// TestParallelSelector exercises the parallel strategy: it dials all nodes
+// concurrently and uses the first that connects, so a dead node never blocks
+// the request.
+func (s *SelectorSuite) TestParallelSelector() {
+	gostC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, "testdata/selector/parallel.yaml", "8080/tcp")
+	s.Require().NoError(err)
+	defer gostC.Terminate(s.ctx)
+
+	code, body := s.proxyRequest(gostC, "8080")
+	s.Require().Equal(0, code)
+	s.Require().Contains(body, "hello-gost")
+}
+
+func TestSelectorSuite(t *testing.T) {
+	suite.Run(t, new(SelectorSuite))
+}

tests/e2e/sniffing_test.go

@@ -0,0 +1,115 @@
+package e2e
+
+import (
+	"context"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// SniffingSuite covers protocol sniffing behavior.
+type SniffingSuite struct {
+	suite.Suite
+	ctx      context.Context
+	httpsEchoC testcontainers.Container
+	httpsIP   string
+}
+
+func (s *SniffingSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	c, err := RunHTTPSEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.httpsEchoC = c
+
+	ip, err := c.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.httpsIP = ip
+}
+
+func (s *SniffingSuite) TearDownSuite() {
+	if s.httpsEchoC != nil {
+		s.httpsEchoC.Terminate(s.ctx)
+	}
+}
+
+// curlThroughSOCKS5 runs curl through the GOST SOCKS5 proxy on the given
+// container address and port, connecting to the HTTPS echo server by IP.
+// Connecting by IP makes curl omit the TLS SNI extension.
+func (s *SniffingSuite) curlThroughSOCKS5(c testcontainers.Container, proxyPort string) string {
+	s.T().Helper()
+	// curl -k: don't verify the self-signed cert on the echo server
+	// curl -x socks5://...: route through GOST SOCKS5 proxy
+	// Using the container IP as the host makes curl skip SNI entirely.
+	cmd := []string{"curl", "-k", "-s",
+		"-x", "socks5://127.0.0.1:" + proxyPort,
+		"https://" + s.httpsIP + ":8443",
+	}
+	code, out, err := c.Exec(s.ctx, cmd)
+	s.Require().NoError(err)
+	s.Require().Zero(code, "curl should exit 0")
+	b, _ := io.ReadAll(out)
+	return string(b)
+}
+
+// TestSOCKS5NoSNI verifies that a SOCKS5 proxy with sniffing enabled can
+// successfully forward TLS connections that lack an SNI extension — such as
+// when a client connects to an HTTPS server by IP address.
+func (s *SniffingSuite) TestSOCKS5NoSNI() {
+	gostC, err := RunGostContainer(s.ctx, SharedNetworkName,
+		"testdata/sniffing/no_sni.yaml",
+	)
+	s.Require().NoError(err)
+	defer func() {
+		DumpLogs(s.T(), s.ctx, "gost-no-sni", gostC)
+		gostC.Terminate(s.ctx)
+	}()
+
+	body := s.curlThroughSOCKS5(gostC, "8080")
+	s.Require().Contains(body, "hello-gost",
+		"HTTPS response should pass through when SNI is empty")
+}
+
+// TestSOCKS5NoSNI_Callback verifies the same behavior a second time, serving
+// as a sanity check that state doesn't leak between connections.
+func (s *SniffingSuite) TestSOCKS5NoSNI_Callback() {
+	s.TestSOCKS5NoSNI()
+}
+
+// TestSOCKS5NoSNI_LogsOnlyDebug verifies the proxy logs a debug message
+// rather than an error when SNI is missing.
+func (s *SniffingSuite) TestSOCKS5NoSNI_LogsOnlyDebug() {
+	gostC, err := RunGostContainer(s.ctx, SharedNetworkName,
+		"testdata/sniffing/no_sni.yaml",
+	)
+	s.Require().NoError(err)
+	defer func() {
+		// Do NOT dump logs before the grep — DumpLogs consumes the reader
+		gostC.Terminate(s.ctx)
+	}()
+
+	body := s.curlThroughSOCKS5(gostC, "8080")
+	s.Require().Contains(body, "hello-gost")
+
+	// Verify the debug log message exists and no error-level SNI message.
+	logs, err := gostC.Logs(s.ctx)
+	s.Require().NoError(err)
+	defer logs.Close()
+	logBody, _ := io.ReadAll(logs)
+	logStr := string(logBody)
+
+	s.Require().Contains(logStr, "no sni in clienthello",
+		"should log a debug message when SNI is empty")
+	s.Require().NotContains(logStr, "tls: sni is empty",
+		"must not error on empty SNI")
+	// The log level for "no sni" should be debug, not error.
+	s.Require().False(strings.Contains(logStr, `"level":"error"`),
+		"should not log any error-level message")
+}
+
+func TestSniffingSuite(t *testing.T) {
+	suite.Run(t, new(SniffingSuite))
+}

tests/e2e/testdata/admission/blacklist.yaml

@@ -0,0 +1,17 @@
+# HTTP proxy gated by a blacklist admission rule: clients whose source address
+# is 127.0.0.1 are denied; everything else is admitted. A loopback client (curl
+# inside the gost container) is denied; an external client (a different
+# container) is admitted and reaches the echo server.
+services:
+  - name: proxy
+    addr: ":8080"
+    admission: admission-0
+    handler:
+      type: http
+    listener:
+      type: tcp
+
+admissions:
+  - name: admission-0
+    matchers:
+      - 127.0.0.1

tests/e2e/testdata/admission/whitelist.yaml

@@ -0,0 +1,18 @@
+# HTTP proxy gated by a whitelist admission rule: only clients whose source
+# address is 127.0.0.1 are admitted. A loopback client (curl inside the gost
+# container) is admitted and reaches the echo server; an external client (a
+# different container) is denied at accept time.
+services:
+  - name: proxy
+    addr: ":8080"
+    admission: admission-0
+    handler:
+      type: http
+    listener:
+      type: tcp
+
+admissions:
+  - name: admission-0
+    whitelist: true
+    matchers:
+      - 127.0.0.1

tests/e2e/testdata/auth/auther.yaml

@@ -0,0 +1,18 @@
+# HTTP proxy authenticated via a named auther holding multiple users. Any
+# listed user/password pair is accepted; unlisted credentials are rejected.
+services:
+  - name: proxy
+    addr: ":8080"
+    handler:
+      type: http
+      auther: auther-0
+    listener:
+      type: tcp
+
+authers:
+  - name: auther-0
+    auths:
+      - username: alice
+        password: secret
+      - username: bob
+        password: hunter2

tests/e2e/testdata/auth/inline.yaml

@@ -0,0 +1,13 @@
+# HTTP proxy with inline single-user authentication. Clients must supply the
+# proxy credentials user/pass; wrong or missing credentials get a 407 and never
+# reach the echo server.
+services:
+  - name: proxy
+    addr: ":8080"
+    handler:
+      type: http
+      auth:
+        username: user
+        password: pass
+    listener:
+      type: tcp

tests/e2e/testdata/bypass/blacklist.yaml

@@ -0,0 +1,29 @@
+# Forward proxy whose only chain node is dead (127.0.0.1:18082). A blacklist
+# bypass matching the destination skips that node and connects directly to the
+# echo server; a non-matching destination is forced through the dead node.
+services:
+  - name: proxy
+    addr: ":8080"
+    handler:
+      type: http
+      chain: my-chain
+    listener:
+      type: tcp
+
+chains:
+  - name: my-chain
+    hops:
+      - name: hop-0
+        nodes:
+          - name: node-0
+            addr: 127.0.0.1:18082
+            bypass: bypass-0
+            connector:
+              type: http
+            dialer:
+              type: tcp
+
+bypasses:
+  - name: bypass-0
+    matchers:
+      - "{{.ServerAddr}}"

tests/e2e/testdata/bypass/whitelist.yaml

@@ -0,0 +1,32 @@
+# Forward proxy whose only chain node is dead (127.0.0.1:18082). A whitelist
+# bypass inverts the logic: only destinations matching the rule are forced
+# through the chain. The echo server's address is outside 10.0.0.0/8, so it is
+# bypassed (connected directly); a 10.0.0.0/8 destination is forced through the
+# dead node.
+services:
+  - name: proxy
+    addr: ":8080"
+    handler:
+      type: http
+      chain: my-chain
+    listener:
+      type: tcp
+
+chains:
+  - name: my-chain
+    hops:
+      - name: hop-0
+        nodes:
+          - name: node-0
+            addr: 127.0.0.1:18082
+            bypass: bypass-0
+            connector:
+              type: http
+            dialer:
+              type: tcp
+
+bypasses:
+  - name: bypass-0
+    whitelist: true
+    matchers:
+      - "10.0.0.0/8"

tests/e2e/testdata/chaingroup/matcher.yaml

@@ -0,0 +1,48 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chainGroup:
+      chains:
+        - chain: chain-target
+          matcher:
+            rule: Host(`tcp-echo`)
+        - chain: chain-other
+          matcher:
+            rule: Host(`no-match`)
+      selector:
+        strategy: round
+        maxFails: 1
+        failTimeout: 10s
+  listener:
+    type: tcp
+
+# Live relay: forwards to echo server.
+- name: relay
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: chain-target
+  hops:
+  - name: hop-target
+    nodes:
+    - name: n-live
+      addr: 127.0.0.1:18081
+      connector:
+        type: http
+
+# This chain has a dead relay — but the matcher Host("no-match") ensures it is
+# never selected for requests targeting tcp-echo.
+- name: chain-other
+  hops:
+  - name: hop-other
+    nodes:
+    - name: n-dead
+      addr: 127.0.0.1:18082
+      connector:
+        type: http

tests/e2e/testdata/chaingroup/probe.yaml

@@ -0,0 +1,52 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chainGroup:
+      chains:
+        - chain: chain-live
+          probe:
+            type: tcp
+            addr: 127.0.0.1:18081
+            interval: 3s
+        - chain: chain-dead
+          probe:
+            type: tcp
+            addr: 127.0.0.1:18082
+            interval: 3s
+      selector:
+        strategy: round
+        maxFails: 1
+        failTimeout: 10s
+  listener:
+    type: tcp
+
+# Live relay: forwards to echo server.
+- name: relay
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: chain-live
+  hops:
+  - name: hop-live
+    nodes:
+    - name: n-live
+      addr: 127.0.0.1:18081
+      connector:
+        type: http
+
+# Dead chain: relay never listens here. TCP probe marks the chain entry so
+# FailFilter excludes it before real traffic reaches it.
+- name: chain-dead
+  hops:
+  - name: hop-dead
+    nodes:
+    - name: n-dead
+      addr: 127.0.0.1:18082
+      connector:
+        type: http

tests/e2e/testdata/failcodes/failcodes.yaml

@@ -0,0 +1,27 @@
+services:
+# Reverse proxy with sniffing: raw TCP listener inspects HTTP via the
+# forwarder's sniffer. The hop has FIFO selector (always picks first node).
+# node-429 is first in the list with failCodes=429 — it must be marked on
+# the first 429 response and excluded by FailFilter (maxFails=1).
+- name: reverse-proxy
+  addr: :8080
+  handler:
+    type: tcp
+    metadata:
+      sniffing: true
+      sniffing.timeout: 2s
+  listener:
+    type: tcp
+  forwarder:
+    selector:
+      strategy: fifo
+      maxFails: 1
+    nodes:
+    - name: node-429
+      addr: status-backend:5680
+      protocol: http
+      http:
+        failCodes: "429"
+    - name: node-good
+      addr: tcp-echo:5678
+      protocol: http

tests/e2e/testdata/forward/server_udp_sniffing_quic.yaml

@@ -0,0 +1,15 @@
+services:
+  - name: udp-forward-quic
+    addr: :9000
+    handler:
+      type: udp
+      metadata:
+        sniffing: true
+        sniffing.timeout: 5s
+        stateless: true
+    listener:
+      type: udp
+    forwarder:
+      nodes:
+        - name: echo
+          addr: udp-echo:5679

tests/e2e/testdata/hosts/hosts.yaml

@@ -0,0 +1,18 @@
+# HTTP proxy with a static hosts mapping. The made-up hostname echo.internal is
+# mapped to the echo server's real IP, overriding DNS. A request to
+# echo.internal resolves via the mapping and reaches the echo server; a request
+# to an unmapped hostname fails to resolve and never connects.
+services:
+  - name: proxy
+    addr: ":8080"
+    hosts: hosts-0
+    handler:
+      type: http
+    listener:
+      type: tcp
+
+hosts:
+  - name: hosts-0
+    mappings:
+      - ip: {{.ServerAddr}}
+        hostname: echo.internal

tests/e2e/testdata/http/server_policy_bypass.yaml

@@ -0,0 +1,18 @@
+# Service-level destination bypass (blacklist) on an HTTP forward proxy.
+# Blocks the echo server's address ({{.ServerAddr}}). Used by
+# TestHTTPProxyGostTargetPolicyBypass to verify that a Gost-Target header
+# cannot separate the authority evaluated by the policy from the authority the
+# transport dials.
+bypasses:
+  - name: bypass-0
+    matchers:
+      - "{{.ServerAddr}}"
+
+services:
+  - name: http-policy
+    addr: ":8080"
+    handler:
+      type: http
+    listener:
+      type: tcp
+    bypass: bypass-0

tests/e2e/testdata/http_cache/server_cache.yaml

@@ -0,0 +1,22 @@
+caches:
+- name: http-cache
+  memory:
+    ttl: 10m
+    maxSize: 1000
+
+services:
+- name: cache-proxy
+  addr: :8080
+  cache: http-cache
+  handler:
+    type: tcp
+    metadata:
+      sniffing: true
+      sniffing.timeout: 2s
+      cache.ttl: 60s
+  listener:
+    type: tcp
+  forwarder:
+    nodes:
+    - name: target
+      addr: cache-backend:5677

tests/e2e/testdata/http_cache/server_cache_servestale.yaml

@@ -0,0 +1,23 @@
+caches:
+- name: http-cache
+  memory:
+    ttl: 10m
+    maxSize: 1000
+
+services:
+- name: cache-proxy
+  addr: :8080
+  cache: http-cache
+  handler:
+    type: tcp
+    metadata:
+      sniffing: true
+      sniffing.timeout: 2s
+      cache.ttl: 3s
+      cache.serveStale: true
+  listener:
+    type: tcp
+  forwarder:
+    nodes:
+    - name: target
+      addr: cache-servestale:5676

tests/e2e/testdata/http_cache/server_nocache.yaml

@@ -0,0 +1,14 @@
+services:
+- name: cache-proxy
+  addr: :8080
+  handler:
+    type: tcp
+    metadata:
+      sniffing: true
+      sniffing.timeout: 2s
+  listener:
+    type: tcp
+  forwarder:
+    nodes:
+    - name: target
+      addr: cache-backend:5677

tests/e2e/testdata/ingress/client.yaml

@@ -0,0 +1,37 @@
+# Internal client behind NAT: binds a reverse tunnel (tunnel.id matches the
+# server's ingress endpoint) and forwards tunneled connections to the echo
+# server. The tunnel server is reached via chain-0's tunnel connector.
+#
+# service-1 is a dummy TCP listener on a fixed port; the rtcp reverse-tunnel
+# listener binds remotely through the chain and opens no local port, so this
+# gives the e2e harness a stable port to wait on.
+services:
+  - name: service-0
+    addr: ":0"
+    handler:
+      type: rtcp
+    listener:
+      type: rtcp
+      chain: chain-0
+    forwarder:
+      nodes:
+        - addr: tcp-echo:5678
+
+  - name: service-1
+    addr: ":8423"
+    handler:
+      type: http
+    listener:
+      type: tcp
+
+chains:
+  - name: chain-0
+    hops:
+      - nodes:
+        - addr: gost-server:8421
+          connector:
+            type: tunnel
+            metadata:
+              tunnel.id: 6be39003-f4fa-49e4-a6ef-1997684d160e
+          dialer:
+            type: tcp

tests/e2e/testdata/ingress/server.yaml

@@ -0,0 +1,23 @@
+# Public-facing gost: a tunnel handler with an ingress table that maps the
+# hostname example.local to a tunnel endpoint, plus an HTTP entrypoint on :8420.
+# External requests to the entrypoint are routed by their Host header through
+# the ingress table to the matching tunnel.
+services:
+  - name: service-0
+    addr: ":8421"
+    handler:
+      type: tunnel
+      metadata:
+        entrypoint: ":8420"
+        ingress: ingress-0
+    listener:
+      type: tcp
+
+ingresses:
+  - name: ingress-0
+    rules:
+      - hostname: example.local
+        endpoint: 6be39003-f4fa-49e4-a6ef-1997684d160e
+
+log:
+  level: debug

tests/e2e/testdata/mtls/server.yaml

@@ -0,0 +1,17 @@
+services:
+- name: https-mtls
+  addr: :8443
+  handler:
+    type: http
+    auther: auther-0
+  listener:
+    type: tls
+    tls:
+      certFile: /certs/server.pem
+      keyFile: /certs/server-key.pem
+      caFile: /certs/ca.pem
+authers:
+- name: auther-0
+  plugin:
+    type: http
+    addr: http://{{.ServerAddr}}:9000/auth

tests/e2e/testdata/pht/client_connector.yaml

@@ -0,0 +1,20 @@
+services:
+- name: pht-proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: pht-chain
+  listener:
+    type: tcp
+
+chains:
+- name: pht-chain
+  hops:
+  - name: pht-hop
+    nodes:
+    - name: pht-node
+      addr: {{.ServerAddr}}
+      connector:
+        type: http
+      dialer:
+        type: pht

tests/e2e/testdata/pht/client_connector_phts.yaml

@@ -0,0 +1,20 @@
+services:
+- name: phts-proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: phts-chain
+  listener:
+    type: tcp
+
+chains:
+- name: phts-chain
+  hops:
+  - name: phts-hop
+    nodes:
+    - name: phts-node
+      addr: {{.ServerAddr}}
+      connector:
+        type: http
+      dialer:
+        type: phts

tests/e2e/testdata/pht/server.yaml

@@ -0,0 +1,7 @@
+services:
+- name: pht-server
+  addr: :8443
+  handler:
+    type: http
+  listener:
+    type: pht

tests/e2e/testdata/pht/server_phts.yaml

@@ -0,0 +1,7 @@
+services:
+- name: phts-server
+  addr: :8443
+  handler:
+    type: http
+  listener:
+    type: phts

tests/e2e/testdata/probe/cmd.yaml

@@ -0,0 +1,43 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: my-chain
+  listener:
+    type: tcp
+
+# Live relay: forwards to the echo server.
+- name: relay
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: my-chain
+  hops:
+  - name: hop-1
+    selector:
+      strategy: round
+      maxFails: 1
+      failTimeout: 10s
+    nodes:
+    - name: node-live
+      addr: 127.0.0.1:18081
+      connector:
+        type: http
+      probe:
+        type: cmd
+        command: "true"
+        interval: 5s
+    # This node's probe always fails → pre-marked dead → FailFilter excludes it.
+    - name: node-dead
+      addr: 127.0.0.1:18082
+      connector:
+        type: http
+      probe:
+        type: cmd
+        command: "false"
+        interval: 5s

tests/e2e/testdata/probe/lowestlatency.yaml

@@ -0,0 +1,49 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: my-chain
+  listener:
+    type: tcp
+
+# Two live relays — both forward to the echo server.
+- name: relay-a
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+- name: relay-b
+  addr: 127.0.0.1:18082
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: my-chain
+  hops:
+  - name: hop-1
+    selector:
+      strategy: lowestlatency
+      maxFails: 1
+      failTimeout: 10s
+    nodes:
+    - name: node-a
+      addr: 127.0.0.1:18081
+      connector:
+        type: http
+      probe:
+        type: tcp
+        addr: 127.0.0.1:18081
+        interval: 5s
+    - name: node-b
+      addr: 127.0.0.1:18082
+      connector:
+        type: http
+      probe:
+        type: tcp
+        addr: 127.0.0.1:18082
+        interval: 5s

tests/e2e/testdata/probe/recovery.yaml

@@ -0,0 +1,52 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: my-chain
+  listener:
+    type: tcp
+
+# Two live relays — both forward to the echo server. Relays never go down;
+# liveness is driven solely by the cmd probes reading flag files in the
+# container, so the test can flip node health without restarting anything.
+- name: relay-a
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+- name: relay-b
+  addr: 127.0.0.1:18082
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: my-chain
+  hops:
+  - name: hop-1
+    selector:
+      strategy: lowestlatency
+      maxFails: 1
+      failTimeout: 10s
+    nodes:
+    - name: node-a
+      addr: 127.0.0.1:18081
+      connector:
+        type: http
+      probe:
+        # exits 1 while /tmp/a_down exists → node marked dead by probe.
+        type: cmd
+        command: "test -f /tmp/a_down && exit 1 || exit 0"
+        interval: 2s
+    - name: node-b
+      addr: 127.0.0.1:18082
+      connector:
+        type: http
+      probe:
+        type: cmd
+        command: "test -f /tmp/b_down && exit 1 || exit 0"
+        interval: 2s

tests/e2e/testdata/probe/tcp.yaml

@@ -0,0 +1,44 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: my-chain
+  listener:
+    type: tcp
+
+# Live relay: forwards to the echo server.
+- name: relay
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: my-chain
+  hops:
+  - name: hop-1
+    selector:
+      strategy: round
+      maxFails: 1
+      failTimeout: 10s
+    nodes:
+    - name: node-live
+      addr: 127.0.0.1:18081
+      connector:
+        type: http
+      probe:
+        type: tcp
+        addr: 127.0.0.1:18081
+        interval: 5s
+    # dead node: probed, marked as failed by the probe goroutine,
+    # then excluded by FailFilter before any real traffic tries it.
+    - name: node-dead
+      addr: 127.0.0.1:18082
+      connector:
+        type: http
+      probe:
+        type: tcp
+        addr: 127.0.0.1:18082
+        interval: 5s

tests/e2e/testdata/proxyproto/v1.yaml

@@ -0,0 +1,19 @@
+# go-gost/gost#677 — send-proxy (PROXY protocol v1) for the rtcp forward handler.
+# gost accepts a TCP connection on :8080 and forwards it to the backend,
+# prepending a "PROXY TCP4 ..." header because metadata.proxyProtocol is 1.
+services:
+  - name: service-0
+    addr: ":8080"
+    handler:
+      type: rtcp
+      metadata:
+        proxyProtocol: 1
+    listener:
+      type: rtcp
+    forwarder:
+      nodes:
+        - name: target-0
+          addr: proxy-capture:5678
+
+log:
+  level: debug

tests/e2e/testdata/proxyproto/v2.yaml

@@ -0,0 +1,18 @@
+# go-gost/gost#677 — send-proxy (PROXY protocol v2) for the rtcp forward handler.
+# Same as v1.yaml but emits the binary v2 header (metadata.proxyProtocol: 2).
+services:
+  - name: service-0
+    addr: ":8080"
+    handler:
+      type: rtcp
+      metadata:
+        proxyProtocol: 2
+    listener:
+      type: rtcp
+    forwarder:
+      nodes:
+        - name: target-0
+          addr: proxy-capture:5678
+
+log:
+  level: debug

tests/e2e/testdata/quic/client.yaml

@@ -0,0 +1,22 @@
+services:
+- name: http-proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: quic-chain
+  listener:
+    type: tcp
+
+chains:
+- name: quic-chain
+  hops:
+  - name: hop-0
+    nodes:
+    - name: node-0
+      addr: {{.ServerAddr}}
+      connector:
+        type: http
+      dialer:
+        type: quic
+        metadata:
+          cipherKey: 0123456789abcdef0123456789abcdef

tests/e2e/testdata/quic/server.yaml

@@ -0,0 +1,9 @@
+services:
+- name: quic-http
+  addr: :18843
+  handler:
+    type: http
+  listener:
+    type: quic
+    metadata:
+      cipherKey: 0123456789abcdef0123456789abcdef

tests/e2e/testdata/red_sniffing/whitelist.yaml

@@ -0,0 +1,27 @@
+# gost#899: whitelist bypass + sniffing on a transparent (red) proxy.
+# The whitelist contains only a domain ("https-echo", the docker network alias
+# of the HTTPS echo container). A bare destination IP is never in it, so on a
+# broken build the pre-sniffing IP bypass check rejects every connection
+# before SNI sniffing can match the host. The fix skips that check in
+# whitelist mode and lets the sniffer drive the decision from the SNI.
+log:
+  level: debug
+services:
+  - name: transparent-egress
+    addr: ":12345"
+    bypass: allowlist
+    metadata:
+      so_mark: 114514
+    handler:
+      type: red
+      metadata:
+        sniffing: true
+        sniffing.timeout: 5s
+        sniffing.fallback: true
+    listener:
+      type: red
+bypasses:
+  - name: allowlist
+    whitelist: true
+    matchers:
+      - https-echo

tests/e2e/testdata/resolver/server.yaml

@@ -0,0 +1,19 @@
+# HTTP proxy whose outbound dialing uses a custom resolver. The resolver's
+# only nameserver is the test DNS responder, which answers echo.test with the
+# real echo server IP and NXDOMAIN for everything else. A request to
+# echo.test:5678 is therefore resolved by the custom resolver and reaches the
+# echo server; a request to an unmapped host fails to resolve.
+services:
+  - name: proxy
+    addr: ":8080"
+    resolver: resolver-0
+    handler:
+      type: http
+    listener:
+      type: tcp
+
+resolvers:
+  - name: resolver-0
+    nameservers:
+      - addr: dns-responder:5353
+        timeout: 3s

tests/e2e/testdata/routing/server.yaml

@@ -0,0 +1,27 @@
+# Forward proxy gated by a node-level routing matcher. The only chain node is a
+# relay to an upstream proxy, but it is only eligible when the request Host
+# matches Host(`tcp-echo`). A request to tcp-echo:5678 matches, is relayed
+# upstream, and reaches the echo server ("hello-gost"); a request to any other
+# host is excluded (no eligible node) and never reaches the echo server.
+services:
+  - name: proxy
+    addr: ":8080"
+    handler:
+      type: http
+      chain: chain-0
+    listener:
+      type: tcp
+
+chains:
+  - name: chain-0
+    hops:
+      - name: hop-0
+        nodes:
+          - name: node-0
+            addr: gost-upstream:8081
+            matcher:
+              rule: 'Host(`tcp-echo`)'
+            connector:
+              type: http
+            dialer:
+              type: tcp

tests/e2e/testdata/routing/upstream.yaml

@@ -0,0 +1,9 @@
+# Upstream relay target for the routing matcher test: a plain forward proxy
+# that reaches the echo server directly.
+services:
+  - name: proxy
+    addr: ":8081"
+    handler:
+      type: http
+    listener:
+      type: tcp

tests/e2e/testdata/rtcpfilter/client.yaml

@@ -0,0 +1,51 @@
+# Internal client behind NAT: binds a reverse tunnel (tunnel.id matches the
+# server's ingress endpoint) and forwards tunneled connections to per-hostname
+# target services via filter.host node matching. There is deliberately NO
+# fallback node — routing must come from the hostname.
+#
+# node example → tcp-echo:5678 (the real echo HTTP server)
+# node other   → tcp-echo:5679 (nothing listens here; must never be hit by
+#                               example.local traffic)
+services:
+  - name: service-0
+    addr: ":0"
+    handler:
+      type: rtcp
+    listener:
+      type: rtcp
+      chain: chain-0
+    forwarder:
+      nodes:
+        - name: example
+          addr: tcp-echo:5678
+          filter:
+            host: example.local
+        - name: other
+          addr: tcp-echo:5679
+          filter:
+            host: other.local
+
+  # Dummy TCP service on a fixed port: the rtcp reverse-tunnel listener binds
+  # remotely through the chain and opens no local port, so this gives the e2e
+  # harness a stable port to wait on.
+  - name: service-1
+    addr: ":8423"
+    handler:
+      type: http
+    listener:
+      type: tcp
+
+chains:
+  - name: chain-0
+    hops:
+      - nodes:
+        - addr: gost-server:8421
+          connector:
+            type: tunnel
+            metadata:
+              tunnel.id: 6be39003-f4fa-49e4-a6ef-1997684d160e
+          dialer:
+            type: tcp
+
+log:
+  level: debug

tests/e2e/testdata/rtcpfilter/server.yaml

@@ -0,0 +1,25 @@
+# Public-facing gost: tunnel handler with an ingress table mapping two
+# hostnames to the SAME tunnel endpoint (multi-TCP-service sharing one tunnel
+# ID — the gost#898 scenario). Requests to the HTTP entrypoint are routed by
+# their Host header through the ingress table to the matching tunnel.
+services:
+  - name: service-0
+    addr: ":8421"
+    handler:
+      type: tunnel
+      metadata:
+        entrypoint: ":8420"
+        ingress: ingress-0
+    listener:
+      type: tcp
+
+ingresses:
+  - name: ingress-0
+    rules:
+      - hostname: example.local
+        endpoint: 6be39003-f4fa-49e4-a6ef-1997684d160e
+      - hostname: other.local
+        endpoint: 6be39003-f4fa-49e4-a6ef-1997684d160e
+
+log:
+  level: debug

tests/e2e/testdata/rudpbind/client.yaml

@@ -0,0 +1,34 @@
+# Internal client behind NAT for gost#911: a UDP forward service that sends all
+# traffic to the port the host bound through the reverse tunnel.
+#
+# The forwarder target is gost-server:8432 — that is where the reverse tunnel is
+# actually bound (the host's rudp listener asked the relay server to bind it, so
+# the port lives on the relay server, not on the host). Datagrams go there and
+# are carried back to the internal host over the one shared tunnel stream.
+services:
+  - name: service-0
+    addr: ":8432"
+    handler:
+      type: udp
+    listener:
+      type: udp
+      metadata:
+        keepalive: true
+        ttl: 5m
+    forwarder:
+      nodes:
+        - name: tunnel
+          addr: gost-server:8432
+
+chains:
+  - name: chain-0
+    hops:
+      - nodes:
+        - addr: gost-server:8430
+          connector:
+            type: relay
+          dialer:
+            type: tcp
+
+log:
+  level: debug

tests/e2e/testdata/rudpbind/host.yaml

@@ -0,0 +1,44 @@
+# Internal host behind NAT for gost#911: binds a reverse UDP tunnel (rudp)
+# through the relay server and forwards it to the local UDP echo server.
+#
+# The rudp listener opens no local port — it binds the UDP port remotely through
+# the chain. service-1 is a dummy TCP listener purely so the e2e harness has a
+# stable port to wait on for container readiness.
+services:
+  - name: service-0
+    addr: "0.0.0.0:8432"
+    handler:
+      type: rudp
+    listener:
+      type: rudp
+      chain: chain-0
+      metadata:
+        ttl: 5m
+    forwarder:
+      nodes:
+        - name: echo
+          addr: udp-echo:5679
+
+  # Dummy TCP service on a fixed port: the rudp reverse-tunnel listener binds
+  # remotely through the chain and opens no local port, so this gives the e2e
+  # harness a stable port to wait on. Nothing ever targets it — the harness
+  # only opens and immediately closes the connection.
+  - name: service-1
+    addr: ":8431"
+    handler:
+      type: tcp
+    listener:
+      type: tcp
+
+chains:
+  - name: chain-0
+    hops:
+      - nodes:
+        - addr: gost-server:8430
+          connector:
+            type: relay
+          dialer:
+            type: tcp
+
+log:
+  level: debug

tests/e2e/testdata/rudpbind/server.yaml

@@ -0,0 +1,16 @@
+# Public-facing relay server for gost#911: allows UDP BIND so an internal host
+# can bind a reverse UDP tunnel through it. The host asks the server to bind
+# the tunnel's UDP port, so that port lives here — on the relay server, not on
+# the host behind NAT.
+services:
+  - name: service-0
+    addr: ":8430"
+    handler:
+      type: relay
+      metadata:
+        bind: true
+    listener:
+      type: tcp
+
+log:
+  level: debug

tests/e2e/testdata/selector/backup.yaml

@@ -0,0 +1,37 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: my-chain
+  listener:
+    type: tcp
+
+# Live relay: forwards the request to the echo server (curl target).
+- name: relay
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: my-chain
+  hops:
+  - name: hop-1
+    selector:
+      strategy: round
+      maxFails: 1
+    nodes:
+    # primary: dead, non-backup.
+    - name: node-1
+      addr: 127.0.0.1:18082
+      connector:
+        type: http
+    # backup: only used once all primary nodes are dead.
+    - name: node-2
+      addr: 127.0.0.1:18081
+      connector:
+        type: http
+      metadata:
+        backup: true

tests/e2e/testdata/selector/fifo.yaml

@@ -0,0 +1,34 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: my-chain
+  listener:
+    type: tcp
+
+# Live relay: forwards the request to the echo server (curl target).
+- name: relay
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: my-chain
+  hops:
+  - name: hop-1
+    selector:
+      strategy: fifo
+      maxFails: 1
+    nodes:
+    # primary: dead, so fifo must fall through to the secondary node.
+    - name: node-1
+      addr: 127.0.0.1:18082
+      connector:
+        type: http
+    - name: node-2
+      addr: 127.0.0.1:18081
+      connector:
+        type: http

tests/e2e/testdata/selector/roundrobin.yaml

@@ -0,0 +1,34 @@
+services:
+- name: proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: my-chain
+  listener:
+    type: tcp
+
+# Live relay: forwards the request to the echo server (curl target).
+- name: relay
+  addr: 127.0.0.1:18081
+  handler:
+    type: http
+  listener:
+    type: tcp
+
+chains:
+- name: my-chain
+  hops:
+  - name: hop-1
+    selector:
+      strategy: round
+      maxFails: 1
+    nodes:
+    - name: node-1
+      addr: 127.0.0.1:18081
+      connector:
+        type: http
+    # dead node: never listens; must be marked and skipped by the selector.
+    - name: node-2
+      addr: 127.0.0.1:18082
+      connector:
+        type: http

tests/e2e/testdata/sniffing/no_sni.yaml

@@ -0,0 +1,12 @@
+services:
+  - name: service-0
+    addr: ":8080"
+    handler:
+      type: socks5
+      metadata:
+        sniffing: true
+    listener:
+      type: tcp
+
+log:
+  level: debug

tests/e2e/testdata/tls/reject_sni.yaml

@@ -0,0 +1,11 @@
+services:
+- name: tls-reject
+  addr: :8443
+  handler:
+    type: http
+  listener:
+    type: tls
+    tls:
+      rejectUnknownSNI: true
+      serverNames:
+      - example.com

tests/e2e/testdata/tls/reject_sni_empty.yaml

@@ -0,0 +1,9 @@
+services:
+- name: tls-reject
+  addr: :8443
+  handler:
+    type: http
+  listener:
+    type: tls
+    tls:
+      rejectUnknownSNI: true

tests/e2e/testdata/utls/client_insecure.yaml

@@ -0,0 +1,24 @@
+services:
+- name: http-proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: utls-chain
+  listener:
+    type: tcp
+
+chains:
+- name: utls-chain
+  hops:
+  - name: hop-0
+    nodes:
+    - name: node-0
+      addr: {{.ServerAddr}}
+      connector:
+        type: http
+      dialer:
+        type: utls
+        metadata:
+          fingerprint: Chrome
+        tls:
+          secure: false

tests/e2e/testdata/utls/client_secure.yaml

@@ -0,0 +1,26 @@
+services:
+- name: http-proxy
+  addr: :8080
+  handler:
+    type: http
+    chain: utls-chain
+  listener:
+    type: tcp
+
+chains:
+- name: utls-chain
+  hops:
+  - name: hop-0
+    nodes:
+    - name: node-0
+      addr: {{.ServerAddr}}
+      connector:
+        type: http
+      dialer:
+        type: utls
+        metadata:
+          fingerprint: Chrome
+        tls:
+          secure: true
+          serverName: utls-server
+          caFile: /certs/ca.pem

tests/e2e/testdata/utls/server_auto.yaml

@@ -0,0 +1,7 @@
+services:
+- name: https-server
+  addr: :8443
+  handler:
+    type: http
+  listener:
+    type: tls

tests/e2e/testdata/utls/server_ca.yaml

@@ -0,0 +1,10 @@
+services:
+- name: https-server
+  addr: :8443
+  handler:
+    type: http
+  listener:
+    type: tls
+    tls:
+      certFile: /certs/server.pem
+      keyFile: /certs/server-key.pem

tests/e2e/tls_test.go

@@ -0,0 +1,93 @@
+package e2e
+
+import (
+	"context"
+	"io"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// TLSSuite covers TLS listener behavior, in particular the rejectUnknownSNI
+// option which drops TLS handshakes with an unknown or empty SNI before any
+// certificate is sent.
+type TLSSuite struct {
+	suite.Suite
+	ctx context.Context
+}
+
+func (s *TLSSuite) SetupSuite() {
+	s.ctx = context.Background()
+}
+
+// startGost starts a gost container with the given TLS listener config. The
+// listener always binds :8443; checks run openssl inside the container.
+func (s *TLSSuite) startGost(yamlPath string) testcontainers.Container {
+	s.T().Helper()
+	rendered, err := RenderConfig(yamlPath, ConfigData{})
+	s.Require().NoError(err)
+	s.T().Cleanup(func() { os.Remove(rendered) })
+
+	c, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, rendered, "8443/tcp")
+	s.Require().NoError(err)
+	return c
+}
+
+// sniHandshake runs openssl s_client against the TLS listener and returns its
+// exit code: 0 means the handshake completed (a certificate was exchanged),
+// non-zero means the handshake was rejected. An empty sni sends no SNI
+// extension.
+func (s *TLSSuite) sniHandshake(c testcontainers.Container, sni string) int {
+	s.T().Helper()
+	args := []string{"openssl", "s_client", "-brief", "-connect", "127.0.0.1:8443"}
+	if sni == "" {
+		args = append(args, "-noservername")
+	} else {
+		args = append(args, "-servername", sni)
+	}
+	code, out, err := c.Exec(s.ctx, args)
+	if err != nil {
+		s.T().Logf("openssl exec error: %v", err)
+		return -1
+	}
+	if b, e := io.ReadAll(out); e == nil {
+		s.T().Logf("openssl output (sni=%q):\n%s", sni, string(b))
+	}
+	return code
+}
+
+// TestRejectWithAllowList covers rejectUnknownSNI with a populated serverNames
+// list: the allowed SNI completes the handshake, while a wrong or missing SNI
+// is rejected.
+func (s *TLSSuite) TestRejectWithAllowList() {
+	c := s.startGost("testdata/tls/reject_sni.yaml")
+	defer c.Terminate(s.ctx)
+
+	s.Require().Zero(s.sniHandshake(c, "example.com"),
+		"handshake with allowed SNI should succeed")
+
+	s.Require().NotZero(s.sniHandshake(c, "wrong.com"),
+		"handshake with disallowed SNI should fail")
+
+	s.Require().NotZero(s.sniHandshake(c, ""),
+		"handshake without SNI should fail")
+}
+
+// TestRejectEmptyOnly covers rejectUnknownSNI with an empty serverNames list:
+// only a missing SNI is rejected, any named SNI is allowed.
+func (s *TLSSuite) TestRejectEmptyOnly() {
+	c := s.startGost("testdata/tls/reject_sni_empty.yaml")
+	defer c.Terminate(s.ctx)
+
+	s.Require().NotZero(s.sniHandshake(c, ""),
+		"handshake without SNI should fail")
+
+	s.Require().Zero(s.sniHandshake(c, "anything.test"),
+		"named SNI should be allowed when allow list is empty")
+}
+
+func TestTLSSuite(t *testing.T) {
+	suite.Run(t, new(TLSSuite))
+}

tests/e2e/utils.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/moby/moby/client"
 	"github.com/testcontainers/testcontainers-go"
+	tcexec "github.com/testcontainers/testcontainers-go/exec"
 	"github.com/testcontainers/testcontainers-go/wait"
 )
 
@@ -23,6 +24,15 @@ type ConfigData struct {
 	ServerAddr string
 }
 
+// ExecOutput runs cmd in c and returns the demultiplexed output reader.
+// testcontainers' Exec returns the raw Docker stream, which multiplexes stdout
+// and stderr with 8-byte framing headers (type byte + 6 zero + length) that
+// interleave with the real data. Demultiplexing produces a clean combined
+// stdout+stderr stream that tests can assert against.
+func ExecOutput(ctx context.Context, c testcontainers.Container, cmd []string) (int, io.Reader, error) {
+	return c.Exec(ctx, cmd, tcexec.Multiplexed())
+}
+
 func DumpLogs(t *testing.T, ctx context.Context, label string, c testcontainers.Container) {
 	logs, err := c.Logs(ctx)
 	if err != nil {
@@ -192,6 +202,72 @@ func RunTCPDNSResponderContainer(ctx context.Context, networkName string) (testc
 	})
 }
 
+// RunResolverResponderContainer starts a UDP DNS responder that answers A
+// queries for "echo.test" with targetIP (an echo server's address) and returns
+// NXDOMAIN for all other names. It is used to prove the resolver module drives
+// outbound dialing: a gost proxy pointed at this responder resolves echo.test
+// to a reachable address. The container is aliased "dns-responder".
+func RunResolverResponderContainer(ctx context.Context, networkName, targetIP string) (testcontainers.Container, error) {
+	req := testcontainers.ContainerRequest{
+		FromDockerfile: testcontainers.FromDockerfile{
+			Context:    ".",
+			Dockerfile: "Dockerfile",
+			Repo:       "gost-e2e",
+			Tag:        "latest",
+			KeepImage:  true,
+			BuildOptionsModifier: func(opts *client.ImageBuildOptions) {
+				opts.NetworkMode = "host"
+			},
+		},
+		Networks: []string{networkName},
+		NetworkAliases: map[string][]string{
+			networkName: {"dns-responder"},
+		},
+		Files: []testcontainers.ContainerFile{
+			{HostFilePath: "scripts/dns_resolver_responder.py", ContainerFilePath: "/scripts/dns_server.py", FileMode: 0644},
+		},
+		ExposedPorts: []string{"5353/udp"},
+		Cmd:          []string{"python3", "/scripts/dns_server.py", targetIP, "5353"},
+		WaitingFor:   wait.ForExposedPort().SkipInternalCheck(),
+	}
+
+	return testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+}
+
+// RunHTTPSEchoContainer starts an HTTPS echo server (self-signed cert) that
+// responds with "hello-gost" on port 8443. The container is registered with
+// the network alias "https-echo".
+func RunHTTPSEchoContainer(ctx context.Context, networkName string) (testcontainers.Container, error) {
+	return testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: testcontainers.ContainerRequest{
+			FromDockerfile: testcontainers.FromDockerfile{
+				Context:    ".",
+				Dockerfile: "Dockerfile",
+				Repo:       "gost-e2e",
+				Tag:        "latest",
+				KeepImage:  true,
+				BuildOptionsModifier: func(opts *client.ImageBuildOptions) {
+					opts.NetworkMode = "host"
+				},
+			},
+			Networks: []string{networkName},
+			NetworkAliases: map[string][]string{
+				networkName: {"https-echo"},
+			},
+			Files: []testcontainers.ContainerFile{
+				{HostFilePath: "scripts/https_echo.py", ContainerFilePath: "/scripts/https_echo.py", FileMode: 0644},
+			},
+			ExposedPorts: []string{"8443/tcp"},
+			Cmd:          []string{"python3", "/scripts/https_echo.py"},
+			WaitingFor:   wait.ForExposedPort(),
+		},
+		Started: true,
+	})
+}
+
 func RunGostContainer(ctx context.Context, networkName, yamlPath string) (testcontainers.Container, error) {
 	return runGostContainer(ctx, networkName, yamlPath, nil, nil, nil)
 }
@@ -228,9 +304,7 @@ func runGostContainer(ctx context.Context, networkName, yamlPath string, aliases
 			},
 		},
 		ExposedPorts: exposedPorts,
-		// internal check for udp ports will be failed
-		WaitingFor: wait.ForExposedPort().SkipInternalCheck(),
-		Networks:   []string{networkName},
+		Networks:     []string{networkName},
 		NetworkAliases: map[string][]string{
 			networkName: aliases,
 		},
@@ -238,6 +312,16 @@ func runGostContainer(ctx context.Context, networkName, yamlPath string, aliases
 		Cmd:   []string{"/bin/gost", "-C", "/config.yaml"},
 	}
 
+	// Wait for the gost process to be ready. With exposed ports we wait for the
+	// port to accept connections; without them (e.g. a socks5 proxy consumed
+	// from inside the container) we wait for a startup log line instead.
+	if len(exposedPorts) > 0 {
+		// internal check for udp ports will be failed
+		req.WaitingFor = wait.ForExposedPort().SkipInternalCheck()
+	} else {
+		req.WaitingFor = wait.ForLog("listening on")
+	}
+
 	return testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
 		ContainerRequest: req,
 		Started:          true,

tests/e2e/utls_test.go

@@ -0,0 +1,188 @@
+package e2e
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	"io"
+	"math/big"
+	"os"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/testcontainers/testcontainers-go"
+)
+
+// UTLSSuite exercises the utls dialer in a forward-proxy chain.
+//
+// Topology:
+//
+//	curl -> client gost (http proxy, :8080)
+//	         -> chain node (http connector + utls dialer)
+//	           -> server gost (http proxy over TLS listener, :8443)
+//	             -> tcp-echo
+type UTLSSuite struct {
+	suite.Suite
+	ctx     context.Context
+	echoC   testcontainers.Container
+	echoIP  string
+	certDir string
+}
+
+func (s *UTLSSuite) SetupSuite() {
+	s.ctx = context.Background()
+
+	certDir, err := os.MkdirTemp("", "gost-utls-certs-*")
+	s.Require().NoError(err)
+	s.certDir = certDir
+	s.generateCerts()
+
+	echoC, err := RunEchoContainer(s.ctx, SharedNetworkName)
+	s.Require().NoError(err)
+	s.echoC = echoC
+
+	echoIP, err := echoC.ContainerIP(s.ctx)
+	s.Require().NoError(err)
+	s.echoIP = echoIP
+}
+
+func (s *UTLSSuite) TearDownSuite() {
+	if s.echoC != nil {
+		s.echoC.Terminate(s.ctx)
+	}
+	os.RemoveAll(s.certDir)
+}
+
+// generateCerts creates a self-signed CA and a server cert for the
+// "utls-server" hostname, writing PEM files to s.certDir.
+func (s *UTLSSuite) generateCerts() {
+	caKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	s.Require().NoError(err)
+	caTmpl := &x509.Certificate{
+		SerialNumber:          big.NewInt(1),
+		Subject:               pkix.Name{CommonName: "Test CA"},
+		NotBefore:             time.Now(),
+		NotAfter:              time.Now().Add(24 * time.Hour),
+		KeyUsage:              x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature,
+		BasicConstraintsValid: true,
+		IsCA:                  true,
+	}
+	caDER, err := x509.CreateCertificate(rand.Reader, caTmpl, caTmpl, &caKey.PublicKey, caKey)
+	s.Require().NoError(err)
+	s.writeCertPEM(s.certDir+"/ca.pem", "CERTIFICATE", caDER)
+	s.writeKeyPEM(s.certDir+"/ca-key.pem", "EC PRIVATE KEY", caKey)
+
+	serverKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	s.Require().NoError(err)
+	serverTmpl := &x509.Certificate{
+		SerialNumber: big.NewInt(2),
+		Subject:      pkix.Name{CommonName: "utls-server"},
+		NotBefore:    time.Now(),
+		NotAfter:     time.Now().Add(24 * time.Hour),
+		KeyUsage:     x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		DNSNames:     []string{"utls-server"},
+	}
+	serverDER, err := x509.CreateCertificate(rand.Reader, serverTmpl, caTmpl, &serverKey.PublicKey, caKey)
+	s.Require().NoError(err)
+	s.writeCertPEM(s.certDir+"/server.pem", "CERTIFICATE", serverDER)
+	s.writeKeyPEM(s.certDir+"/server-key.pem", "EC PRIVATE KEY", serverKey)
+}
+
+// TestUTLSInsecure is the regression test for go-gost/gost#887.
+//
+// A utls dialer with `secure: false` must still complete the handshake
+// (InsecureSkipVerify must be honoured). The previous unsafe.Pointer cast
+// read garbage for InsecureSkipVerify, so it came back false and the
+// handshake failed with "at least one of ServerName, InsecureSkipVerify or
+// InsecureServerNameToVerify must be specified".
+func (s *UTLSSuite) TestUTLSInsecure() {
+	rendered, err := RenderConfig("testdata/utls/client_insecure.yaml",
+		ConfigData{ServerAddr: "utls-server:8443"})
+	s.Require().NoError(err)
+	defer os.Remove(rendered)
+
+	serverC, err := RunGostContainerWithOptions(s.ctx, SharedNetworkName,
+		"testdata/utls/server_auto.yaml", []string{"utls-server"}, []string{"8443/tcp"})
+	s.Require().NoError(err)
+	defer serverC.Terminate(s.ctx)
+
+	clientC, err := RunGostContainerWithPorts(s.ctx, SharedNetworkName, rendered, "8080/tcp")
+	s.Require().NoError(err)
+	defer clientC.Terminate(s.ctx)
+
+	s.requireProxyWorks(clientC, serverC)
+}
+
+// TestUTLSSecureWithCA verifies the converter's RootCAs/ServerName path:
+// with `secure: true` and a CA file, the utls dialer must verify the
+// server's CA-signed certificate and still reach the echo server.
+func (s *UTLSSuite) TestUTLSSecureWithCA() {
+	rendered, err := RenderConfig("testdata/utls/client_secure.yaml",
+		ConfigData{ServerAddr: "utls-server:8443"})
+	s.Require().NoError(err)
+	defer os.Remove(rendered)
+
+	serverC, err := runGostContainer(s.ctx, SharedNetworkName,
+		"testdata/utls/server_ca.yaml",
+		[]string{"utls-server"}, []string{"8443/tcp"},
+		[]testcontainers.ContainerFile{
+			{HostFilePath: s.certDir + "/server.pem", ContainerFilePath: "/certs/server.pem", FileMode: 0644},
+			{HostFilePath: s.certDir + "/server-key.pem", ContainerFilePath: "/certs/server-key.pem", FileMode: 0644},
+		})
+	s.Require().NoError(err)
+	defer serverC.Terminate(s.ctx)
+
+	clientC, err := RunGostContainerWithFiles(s.ctx, SharedNetworkName, rendered,
+		[]testcontainers.ContainerFile{
+			{HostFilePath: s.certDir + "/ca.pem", ContainerFilePath: "/certs/ca.pem", FileMode: 0644},
+		},
+		"8080/tcp")
+	s.Require().NoError(err)
+	defer clientC.Terminate(s.ctx)
+
+	s.requireProxyWorks(clientC, serverC)
+}
+
+// requireProxyWorks drives curl through the client proxy and asserts the
+// echo server's "hello-gost" response is returned.
+func (s *UTLSSuite) requireProxyWorks(clientC, serverC testcontainers.Container) {
+	cmd := []string{"curl", "-v", "-s", "--connect-timeout", "5",
+		"-x", "http://127.0.0.1:8080",
+		fmt.Sprintf("http://%s:5678", s.echoIP)}
+	code, out, err := clientC.Exec(s.ctx, cmd)
+	body, err2 := io.ReadAll(out)
+	if err != nil || err2 != nil || code != 0 || !strings.Contains(string(body), "hello-gost") {
+		DumpLogs(s.T(), s.ctx, "utls client logs", clientC)
+		DumpLogs(s.T(), s.ctx, "utls server logs", serverC)
+	}
+	s.Require().NoError(err)
+	s.Require().NoError(err2)
+	s.Require().Equal(0, code)
+	s.Require().Contains(string(body), "hello-gost")
+}
+
+func TestUTLSSuite(t *testing.T) {
+	suite.Run(t, new(UTLSSuite))
+}
+
+// --- helpers (mirror mtls_test.go) ---
+
+func (s *UTLSSuite) writeCertPEM(path, blockType string, der []byte) {
+	err := os.WriteFile(path, pem.EncodeToMemory(&pem.Block{Type: blockType, Bytes: der}), 0644)
+	s.Require().NoError(err)
+}
+
+func (s *UTLSSuite) writeKeyPEM(path, blockType string, key *ecdsa.PrivateKey) {
+	b, err := x509.MarshalECPrivateKey(key)
+	s.Require().NoError(err)
+	err = os.WriteFile(path, pem.EncodeToMemory(&pem.Block{Type: blockType, Bytes: b}), 0600)
+	s.Require().NoError(err)
+}