Merge remote-tracking branch 'origin/stable' into v2

Build release artifacts in CI

.gitattributes

@@ -0,0 +1,3 @@
+# git config merge.theirs.name "Always accept theirs"
+# git config merge.theirs.driver "cp %B %A"
+default.pgo binary merge=theirs

.github/workflows/ci.yaml

@@ -38,37 +38,60 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
-    timeout-minutes: 5
-    strategy:
-      matrix:
-        go_version:
-          - ~1.16
-          - ^1.17
+    timeout-minutes: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
-      - name: Setup Go
-        uses: actions/setup-go@v2
-        with:
-          go-version: ${{ matrix.go_version }}
+      - uses: jdx/mise-action@v3
+        name: Install mise
 
-      - name: Cache dependencies
-        uses: actions/cache@v2
+      - name: Cache Go modules and build
+        uses: actions/cache@v5
         with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: ${{ runner.os }}-go-
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+          key: ${{ runner.os }}-go-${{ hashFiles('go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
 
       - name: Run tests
-        run: go test -coverprofile=./coverage.txt -covermode=atomic -v ./...
+        run: mise tasks run covtest
 
       - name: Collect coverage
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v5
         with:
-          file: ./coverage.txt
+          files: ./coverage.txt
+
+  fuzz:
+    name: Fuzzing
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          submodules: recursive
+
+      - uses: jdx/mise-action@v3
+        name: Install mise
+
+      - name: Cache Go modules and build
+        uses: actions/cache@v5
+        with:
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+          key: ${{ runner.os }}-go-${{ hashFiles('go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Run fuzzing
+        run: mise tasks run 'test:fuzz:*'
+
 
   lint:
     name: Lint
@@ -76,69 +99,116 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
-      - name: Run linter
-        uses: golangci/golangci-lint-action@v2
+      - uses: jdx/mise-action@v3
+        name: Install mise
+
+      - name: Cache Go modules and build
+        uses: actions/cache@v5
         with:
-          version: v1.43.0
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+          key: ${{ runner.os }}-go-${{ hashFiles('go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Run linter
+        run: mise tasks run lint
+
+  artifacts:
+    name: Build release artifacts
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          submodules: recursive
+
+      - uses: jdx/mise-action@v3
+        name: Install mise
+
+      - name: Cache Go modules
+        uses: actions/cache@v5
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-gomod-${{ hashFiles('go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-gomod-
+
+      - name: Cache cross-compilation build
+        uses: actions/cache@v5
+        with:
+          path: ~/.cache/go-build
+          key: ${{ runner.os }}-goreleaser-${{ hashFiles('go.sum') }}-${{ hashFiles('**/*.go') }}
+          restore-keys: |
+            ${{ runner.os }}-goreleaser-${{ hashFiles('go.sum') }}-
+            ${{ runner.os }}-goreleaser-
+
+      - name: Run release
+        run: mise tasks run release
 
   docker:
     name: Docker
     runs-on: ubuntu-latest
     timeout-minutes: 20
+    permissions:
+      contents: read
+      packages: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
       - name: Get Docker meta
-        id: docker_meta
-        uses: crazy-max/ghaction-docker-meta@v1
+        id: meta
+        uses: docker/metadata-action@v5
         with:
-          images: nineseconds/mtg,ghcr.io/9seconds/mtg
-          tag-semver: "{{version}},{{major}},{{major}}.{{minor}}"
+          images: |
+            nineseconds/mtg
+            ghcr.io/${{ github.repository }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=raw,value=master,enable=${{ github.ref == 'refs/heads/master' }}
+            type=raw,value=stable,enable=${{ github.ref == 'refs/heads/stable' }}
 
       - name: Setup QEMU
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v3
 
       - name: Setup BuildX
-        uses: docker/setup-buildx-action@v1
-
-      - name: Setup cache
-        uses: actions/cache@v2
-        with:
-          path: /tmp/buildx-cache
-          key: ${{ runner.os }}-buildx-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-buildx-
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to DockerHub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
 
-      - name: Login to GHCR.io
+      - name: Login to GitHub Container Registry
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GH_PAT }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v6
         with:
           pull: true
           context: .
           platforms: linux/amd64,linux/arm64,linux/386,linux/arm/v7,linux/arm/v6
           push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.docker_meta.outputs.tags }}
-          labels: ${{ steps.docker_meta.outputs.labels }}
-          cache-from: type=local,src=/tmp/buildx-cache
-          cache-to: type=local,dest=/tmp/buildx-cache
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.github/workflows/codeql-analysis.yml

@@ -21,7 +21,7 @@ permissions:
 
 on:
   push:
-    branches: 
+    branches:
       - master
       - stable
   pull_request:
@@ -45,11 +45,13 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v6
+      with:
+        submodules: recursive
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v1
+      uses: github/codeql-action/init@v4
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -60,7 +62,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v1
+      uses: github/codeql-action/autobuild@v4
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -74,4 +76,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v1
+      uses: github/codeql-action/analyze@v4

.github/workflows/govulncheck.yml

@@ -0,0 +1,42 @@
+---
+
+name: Vulnerability checks
+
+permissions:
+  actions: read
+  checks: read
+  contents: read
+  deployments: read
+  issues: read
+  discussions: read
+  pull-requests: read
+  repository-projects: read
+  security-events: read
+  statuses: read
+
+on:
+  push:
+  pull_request:
+  schedule: # daily at 10:22 UTC
+    - cron: '22 10 * * *'
+  workflow_dispatch:
+
+jobs:
+  vuln:
+    name: Test vulnerabilities
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v6
+      with:
+        submodules: recursive
+
+    - name: Setup Go
+      uses: actions/setup-go@v6
+      with:
+        go-version-file: go.mod
+        cache: true
+
+    - name: Check for vulnerabilities
+      run: |
+        go run golang.org/x/vuln/cmd/govulncheck@latest ./...

.gitignore

@@ -6,8 +6,5 @@
 *.test
 *.out
 mtg
-vendor/
-ccbuilds/
-.bin/
 coverage.txt
 dist/

.golangci.toml

@@ -1,12 +1,21 @@
+# https://golangci-lint.run/docs/configuration/file/
+
+version = '2'
+
 [run]
 concurrency = 4
-deadline = "2m"
 tests = true
-skip-dirs = ["vendor"]
 
-[output]
-format = "colored-line-number"
-
-[linters]
-enable-all = true
-disable = ["ireturn", "varnamelen", "gochecknoglobals", "gas", "goerr113", "exhaustivestruct"]
+# [linters]
+# enable-all = true
+# disable = [
+#     "containedctx",
+#     "exhaustivestruct",
+#     "exhaustruct",
+#     "gas",
+#     "gochecknoglobals",
+#     "goerr113",
+#     "ireturn",
+#     "thelper",
+#     "varnamelen",
+# ]

.goreleaser.yml

@@ -1,5 +1,7 @@
 ---
 
+version: 2
+
 project_name: mtg
 
 before:
@@ -8,13 +10,15 @@ before:
     - go generate ./...
 
 builds:
-  - binary: '{{ .ProjectName }}'
+  - id: default
+    binary: '{{ .ProjectName }}'
     goos:
       - darwin
       - freebsd
       - linux
       - netbsd
       - openbsd
+      - windows
     goarch:
       - 386
       - amd64
@@ -32,30 +36,111 @@ builds:
     ignore:
       - goos: darwin
         goarch: 386
+      - goos: darwin
+        goarch: arm
       - goos: freebsd
         goarch: arm64
       - goos: netbsd
         goarch: arm64
       - goos: openbsd
         goarch: arm64
+      - goos: windows
+        goarch: 386
+      - goos: windows
+        goarch: arm
+  - id: mips
+    binary: '{{ .ProjectName }}'
+    goos:
+      - linux
+    goarch:
+      - mips
+      - mipsle
+    gomips:
+      - softfloat
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -trimpath
+      - -mod=readonly
+    ldflags: -s -w -X main.version={{ .Version }}
+  - id: arm64-v9
+    binary: '{{ .ProjectName }}'
+    goos:
+      - darwin
+      - linux
+    goarch:
+      - arm64
+    goarm64:
+      - v9.0
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -trimpath
+      - -mod=readonly
+    ldflags: -s -w -X main.version={{ .Version }}
+  - id: amd64-v3
+    binary: '{{ .ProjectName }}'
+    goos:
+      - darwin
+      - freebsd
+      - linux
+      - netbsd
+      - openbsd
+      - windows
+    goarch:
+      - amd64
+    goamd64:
+      - v3
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -trimpath
+      - -mod=readonly
+    ldflags: -s -w -X main.version={{ .Version }}
 
 archives:
-  - name_template: '{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
-    format: tar.gz
+  - id: default
+    ids:
+      - default
+      - mips
+    name_template: '{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
+    formats:
+      - tar.gz
     wrap_in_directory: true
     format_overrides:
       - goos: windows
-        format: zip
+        formats:
+          - zip
     files:
       - LICENSE
       - README.md
       - SECURITY.md
+      - BEST_PRACTICES.md
+      - example.config.toml
+  - id: optimized
+    ids:
+      - arm64-v9
+      - amd64-v3
+    name_template: '{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm64 }}-{{ .Arm64 }}{{ end }}{{ if .Amd64 }}-{{ .Amd64 }}{{ end }}'
+    formats:
+      - tar.gz
+    wrap_in_directory: true
+    format_overrides:
+      - goos: windows
+        formats:
+          - zip
+    files:
+      - LICENSE
+      - README.md
+      - SECURITY.md
+      - BEST_PRACTICES.md
+      - example.config.toml
 
 gomod:
   proxy: true
 
 snapshot:
-  name_template: '{{ .Version }}'
+  version_template: '{{ .Version }}'
 
 checksum:
   name_template: '{{ .ProjectName }}-{{ .Version }}-checksums.txt'

.mise.toml

@@ -0,0 +1,104 @@
+[tools]
+"go:golang.org/x/pkgsite/cmd/pkgsite" = "latest"
+"go:golang.org/x/tools/gopls" = "latest"
+"go:golang.org/x/vuln/cmd/govulncheck" = "latest"
+"go:mvdan.cc/gofumpt" = "latest"
+go = "latest"
+golangci-lint = "latest"
+goreleaser = "latest"
+
+[vars]
+fuzzflags = "-fuzztime=120s"
+
+[tasks.build]
+description = "Build binary"
+sources = ["**/*.go", "go.mod", "go.sum"]
+outputs = ["mtg"]
+run = "go build"
+
+[tasks."build:prof"]
+description = "Build binary with profiling enabled"
+sources = ["**/*.go", "go.mod", "go.sum"]
+outputs = ["mtg"]
+run = "go build -tags prof"
+
+[tasks.update]
+description = "Update dependencies"
+run = [
+    "go get -u",
+    "go mod tidy -go=1.26"
+]
+
+[tasks.lint]
+description = "Run linter"
+run = "golangci-lint run"
+
+[tasks.vuln]
+description = "Test for vulnerabilities"
+run = "govulncheck ./..."
+
+[tasks.test]
+description = "Run tests"
+run = "go test -v -race ./..."
+
+[tasks.covtest]
+description = "Run tests with code coverage"
+run = "go test -coverprofile=coverage.txt -covermode=atomic -count=2 -race -v ./..."
+
+[tasks.test-all]
+description = "Run all tests"
+depends = [
+    "test",
+    "test:fuzz:*"
+]
+
+[tasks."test:fuzz:client-hello"]
+description = "Run fuzzy test for ClientHello"
+run = "go test -v {{ vars.fuzzflags }} -fuzz=FuzzReadClientHello ./mtglib/internal/tls/fake"
+
+[tasks."test:fuzz:client-handshake"]
+description = "Run fuzzy test for ClientHandshake"
+run = "go test -v {{ vars.fuzzflags }} -fuzz=FuzzClientServerHandshake ./mtglib/internal/obfuscation"
+
+[tasks."test:fuzz:server-handshake-frame"]
+description = "Run fuzzy test for GenerateHandshakeFrame"
+run = "go test -v {{ vars.fuzzflags }} -fuzz=FuzzGenerateHandshakeFrame ./mtglib/internal/obfuscation"
+
+[tasks.static]
+description = "Build static binary"
+sources = ["**/*.go", "go.mod", "go.sum"]
+outputs = ["mtg"]
+run = """
+#!/bin/bash
+
+version="$(git describe --exact-match HEAD 2>/dev/null || git describe --tags --always)"
+go build \
+    -trimpath \
+    -mod=readonly \
+    -ldflags="-extldflags '-static' -s -w -X 'main.version=$version'" \
+    -a \
+    -tags netgo
+"""
+
+[tasks.release]
+description = "Create release tarballs"
+sources = ["**/*.go", "go.mod", "go.sum", ".goreleaser.yml"]
+run = [
+    "goreleaser --snapshot --clean",
+    "find dist -depth 1 -type d | xargs -r rm -r",
+    "rm ./dist/config.yaml"
+]
+
+[tasks.image]
+description = "Build docker image"
+sources = ["**/*.go", "go.mod", "go.sum", "Dockerfile"]
+run = "docker buildx build --pull -t mtg ."
+
+[tasks.docs]
+description = "Run doc server"
+run = "pkgsite -http 0.0.0.0:10000"
+
+[tasks.fmt]
+description = "Reformat source code"
+sources = ["**/*.go"]
+run = "gofumpt -w --extra ."

BEST_PRACTICES.md

@@ -0,0 +1,55 @@
+# Best practices
+
+This is unfortunate, but since 2018 many things were changed. Most of them
+became way worse. Previous iterations of censorship systems were very dumb,
+DPI were primitive and filtered very obvious things. Nowadays they are
+way more intelligent and it is very naive to treat them frivolously.
+
+In 2026 is not enough to pretend that your mtg installation is a Microsoft
+website that sits in Amsterdam Digital Ocean location. Now your installation
+has to be a website that is mtg in disguise. Yes, it requires a bit more effort
+but this effort is probably less than rotating proxies each other day.
+
+mtproto traffic, even with FakeTLS, has its specifics that are probably
+very well known by DPI systems. These specifics are not something unique but
+could mark an IP address as suspicious. Now let's think:
+
+1. You have a proxy in Amsterdam Digital Ocean that tells it is microsoft.com
+   how hard could it be to find out that this is probably fake? 1 or probably 2
+   DNS queries for `microsoft.com`? In case of some CDN, there are ECS-powered
+   resolvers that are very capable to return results from POV of some subnets.
+   If censor sees no relevant results, will they be afraid to block IP?
+2. You have a proxy in Amsterdam Digital Ocean that tells it is a website from
+   the same public subnet. But not the same. Would it be hard to make these DNS
+   queries and ban IP?
+
+The correct way of having this proxy is following:
+
+1. Register a domain name
+2. Get some VPS, probably in your domestic location
+3. Set that domain name from a step 1 to IP address of that VPS
+4. Generate a couple of HTML pages by LLMs or even copy them from elsewhere
+5. Set some webserver and issue TLS certificates with Let's Encrypt or any other
+   name
+6. Set mtg before this webserver.
+7. Use sing-box or anything like that to provide local socks5 interface and
+   have VPNized uplinks
+8. Set up mtg to use socks5 from a 7 step.
+
+In that case you will get a match of DNS and SNI in requests. As a side effect,
+your proxy will work with XTLS and its friends: XTLS in sniff mode ignores
+IP address a client wants to connect to. Instead, it reads SNI and connect
+to resolved address: a clever idea if user does not have a trustworthy DNS
+set up.
+
+Yes, this is much longer that usual technique, and requires more effort. But
+this is could probably be very well automated to some reasonable extent.
+
+Unfortunately, this is a best practice right now.
+
+Do not also forget about other implementation, like
+[telemt](https://github.com/telemt/telemt). Try everything. Use VPNs. It does
+not really matter which project you are going to use as long it helps you to
+stay connected.
+
+_March 2026._

Dockerfile

@@ -1,21 +1,45 @@
 ###############################################################################
 # BUILD STAGE
 
-FROM golang:1.17-alpine AS build
+FROM golang:1.26-alpine AS build
 
+ENV CGO_ENABLED=0
+
+# this is done for backward compatibility: before that we mounted a config
+# into /config.toml. Some application allow mounting directories only,
+# so it makes problems. So, instead we are going to do 2 steps:
+#  1. Create /config/config.toml as a symlink to /config.toml
+#  2. Force /mtg to use /config/config.toml
+#
+# it helps in both ways: users with directories could use /config directory
+# and overlap a symlink by their bind mount. Old users could continue using
+# /config.toml as a real config.
 RUN set -x \
-  && apk --no-cache --update add \
-    bash \
-    ca-certificates \
-    curl \
-    git \
-    make
+  && mkdir -p /config \
+  && ln -sv /config.toml /config/config.toml
 
-COPY . /app
+RUN --mount=type=cache,target=/var/cache/apk \
+    set -x \
+    && apk --update add \
+      bash \
+      ca-certificates \
+      git
+
+COPY go.mod go.sum /app/
 WORKDIR /app
 
+RUN go mod download
+
+COPY . /app
+
 RUN set -x \
-  && make -j 4 static
+  && version="$(git describe --exact-match HEAD 2>/dev/null || git describe --tags --always)" \
+  && go build \
+      -trimpath \
+      -mod=readonly \
+      -ldflags="-extldflags '-static' -s -w -X 'main.version=$version'" \
+      -a \
+      -tags netgo
 
 
 ###############################################################################
@@ -24,8 +48,9 @@ RUN set -x \
 FROM scratch
 
 ENTRYPOINT ["/mtg"]
-CMD ["run", "/config.toml"]
+CMD ["run", "/config/config.toml"]
 
 COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=build /app/mtg /mtg
 COPY --from=build /app/example.config.toml /config.toml
+COPY --from=build /config /config

Makefile

@@ -1,98 +0,0 @@
-ROOT_DIR     := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
-IMAGE_NAME   := mtg
-APP_NAME     := $(IMAGE_NAME)
-
-GOLANGCI_LINT_VERSION := v1.43.0
-
-VERSION_GO         := $(shell go version)
-VERSION_DATE       := $(shell date -Ru)
-VERSION_TAG        := $(shell git describe --tags --always)
-COMMON_BUILD_FLAGS := -trimpath -mod=readonly -ldflags="-extldflags '-static' -s -w -X 'main.version=$(VERSION_TAG) ($(VERSION_GO)) [$(VERSION_DATE)]'"
-
-GOBIN  := $(ROOT_DIR)/.bin
-GOTOOL := env "GOBIN=$(GOBIN)" "PATH=$(ROOT_DIR)/.bin:$(PATH)"
-
-# -----------------------------------------------------------------------------
-
-.PHONY: all
-all: build
-
-.PHONY: build
-build:
-	@go build $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
-
-$(APP_NAME): build
-
-.PHONY: static
-static:
-	@env CGO_ENABLED=0 GOOS=linux go build \
-		$(COMMON_BUILD_FLAGS) \
-		-tags netgo \
-		-a \
-		-o "$(APP_NAME)"
-
-vendor: go.mod go.sum
-	@$(MOD_ON) go mod vendor
-
-.bin:
-	@mkdir -p "$(GOBIN)" || true
-
-.PHONY: fmt
-fmt:
-	@$(GOTOOL) gofumpt -w -s -extra "$(ROOT_DIR)"
-
-.PHONY: test
-test:
-	@go test -v ./...
-
-.PHONY: citest
-citest:
-	@go test -coverprofile=coverage.txt -covermode=atomic -parallel 2 -race -v ./...
-
-.PHONY: clean
-clean:
-	@git clean -xfd && \
-		git reset --hard >/dev/null && \
-		git submodule foreach --recursive sh -c 'git clean -xfd && git reset --hard' >/dev/null
-
-.PHONY: lint
-lint:
-	@$(GOTOOL) golangci-lint run
-
-.PHONY: release
-release:
-	@$(GOTOOL) goreleaser release --snapshot --rm-dist && \
-		find "$(ROOT_DIR)/dist" -type d | grep -vP "dist$$" | xargs -r rm -rf && \
-		rm -f "$(ROOT_DIR)/dist/config.yaml"
-
-.PHONY: docker
-docker:
-	@docker build --pull -t "$(IMAGE_NAME)" "$(ROOT_DIR)"
-
-.PHONY: doc
-doc:
-	@$(GOTOOL) godoc -http 0.0.0.0:10000
-
-.PHONY: install-tools
-install-tools: install-tools-lint install-tools-godoc install-tools-gofumpt install-tools-goreleaser
-
-.PHONY: install-tools-lint
-install-tools-lint: .bin
-	@curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh \
-		| bash -s -- -b "$(GOBIN)" "$(GOLANGCI_LINT_VERSION)"
-
-.PHONY: install-tools-godoc
-install-tools-godoc: .bin
-	@$(GOTOOL) go install golang.org/x/tools/cmd/godoc@latest
-
-.PHONY: install-tools-gofumpt
-install-tools-gofumpt: .bin
-	@$(GOTOOL) go install mvdan.cc/gofumpt@latest
-
-.PHONY: goreleaser
-install-tools-goreleaser: .bin
-	@$(GOTOOL) go install github.com/goreleaser/goreleaser@latest
-
-.PHONY: update-deps
-update-deps:
-	@go get -u && go mod tidy

README.md

@@ -1,6 +1,6 @@
 # mtg
 
-Highly-opionated (ex-bullshit-free) MTPROTO proxy for
+Highly-opinionated (ex-bullshit-free) MTPROTO proxy for
 [Telegram](https://telegram.org/).
 
 [![CI](https://github.com/9seconds/mtg/actions/workflows/ci.yaml/badge.svg?branch=master)](https://github.com/9seconds/mtg/actions/workflows/ci.yaml)
@@ -10,6 +10,17 @@ Highly-opionated (ex-bullshit-free) MTPROTO proxy for
 **If you use v1.0 or upgrade broke you proxy, please read the chapter
 [Version 2](#version-2)**
 
+If you want to have a proxy that _supports adtag_ (possibility to promote a
+channel with a special Telegram bot), I recommend to use
+[telemt](https://github.com/telemt/telemt) project. v1 of mtg supports it
+but I do not see any reasonable point of using it: adtag requires communication
+via a fragile set of middle proxies, requires complex setup that must expose
+a public IPs, has lower bandwidth and latency.
+
+mtg idea is simple: minimal unbloated proxy that can handle a reasonable scale
+~10-20k simultaneous connections, has no user management, but ticks all
+checkboxes related to its main intent: provide a way to use Telegram.
+
 ## Rationale
 
 There are several available proxies for Telegram MTPROTO available. Here
@@ -18,6 +29,7 @@ are the most notable:
 * [Official](https://github.com/TelegramMessenger/MTProxy)
 * [Python](https://github.com/alexbers/mtprotoproxy)
 * [Erlang](https://github.com/seriyps/mtproto_proxy)
+* [Telemt (Rust)](https://github.com/telemt/telemt)
 
 You can use any of these. They work great and all implementations have
 feature parity now. This includes support of adtag, replay attack
@@ -26,6 +38,33 @@ goal: to give a possibility to connect to Telegram in a restricted,
 censored environment. But it does it slightly differently in details
 that probably matter.
 
+* **Domain fronting**
+
+  For years mtg supports domain fronting. This technique means that it fallbacks
+  to accessing a real website in case if request fails. It could fail by many
+  reasons: anti-replay protection, accidental access to the webserver or
+  stale request. Anyway, if mtg rejects this request, it does not break a
+  connection. It connects to the websites and replicates everything that client
+  has sent, and simply proxies it back as is. Users will see a response from
+  the real website, _byte-to-byte identical_ to the response of the real netloc.
+
+* **Doppelganger**
+
+  mtg also is a doppelganger of the website it fronts. Sure, with domain fronting
+  users will see replies of the real website in case if something will go wrong.
+  But what about such cases when _everything is fine_?
+
+  In that case mtg mimics TLS connection statistical characteristics as close as
+  possible. Different application have different statistics of their patterns.
+  Big CDN steadily pumping the data, small websites burst with short easily
+  compressiable chunks of traffic.
+
+  mtg artificially emulates those delays to be statistically indistinguishable
+  from the real website even if it covers connection of the very specific app.
+  It also follows 2 most common patterns of traffic chunking, so censors
+  will have to put more resources to find out that we have Telegram here
+  but not a hookah webshop served by nginx.
+
 * **Resource-efficient**
 
   It has to be resource-efficient. It does not mean that you will see
@@ -40,12 +79,21 @@ that probably matter.
   way of doing business I suppose. I think the only viable way is to
   have a proxy that can be restored anywhere easily.
 
+* **Supports proxy protocol v1/v2**
+
+  This makes integration with loadbalancers like HAProxy and ELB a first class
+  citizen by supporting their
+  [commuication protocols](https://www.haproxy.org/download/2.3/doc/proxy-protocol.txt).
+
 * **A single secret**
 
   I think that multiple secrets solve no problems and just complex
   software. I also believe that in the case of throwout proxies, this
   the feature is a useless luxury.
 
+  This is very controversial topic. Please read [rationale (in russian)](https://github.com/9seconds/mtg/issues/376#issuecomment-4118726699)
+  and use [mtg-multi](https://github.com/dolonet/mtg-multi) fork if you are disagree with.
+
 * **No adtag support**
 
   Please read [Version 2](#version-2) chapter.
@@ -75,6 +123,8 @@ that probably matter.
   software (written in Golang) with a minimum effort + you can replace
   some parts with those you want.
 
+Please also to read about [best practices](https://github.com/9seconds/mtg/blob/master/BEST_PRACTICES.md).
+
 ### Version 2
 
 If you use version 1.x before, you are probably noticed some major
@@ -162,6 +212,12 @@ This project has several main branches
 
 ## Getting started
 
+### Download mise
+
+mtg uses [mise](https://mise.jdx.dev/) to maintain its development
+dependencies + replaces a make for building things. Please
+[install](https://mise.jdx.dev/getting-started.html) it first.
+
 ### Download a tool
 
 #### Download binaries
@@ -190,7 +246,7 @@ surprises. Always choose some version tag.
 Also, if you have `go` installed, you can always download this tool with `go get`:
 
 ```console
-go get github.com/9seconds/mtg/v2
+go install github.com/9seconds/mtg/v2@latest
 ```
 
 #### Build from sources
@@ -198,13 +254,14 @@ go get github.com/9seconds/mtg/v2
 ```console
 git clone https://github.com/9seconds/mtg.git
 cd mtg
-make static
+mise install
+mise tasks run build
 ```
 
 or for the docker image:
 
 ```console
-make docker
+mise tasks run image
 ```
 
 ### Generate secret
@@ -224,6 +281,16 @@ $ mtg generate-secret --hex google.com
 ee473ce5d4958eb5f968c87680a23854a0676f6f676c652e636f6d
 ```
 
+equivalent commands with docker:
+
+```console
+$ docker run --rm nineseconds/mtg:2 generate-secret google.com
+7ibaERuTSGPH1RdztfYnN4tnb29nbGUuY29t
+
+$ docker run --rm nineseconds/mtg:2 generate-secret --hex google.com
+ee473ce5d4958eb5f968c87680a23854a0676f6f676c652e636f6d
+```
+
 This secret is a keystone for a proxy and your password for a client.
 You need to keep it secured.
 
@@ -237,6 +304,38 @@ For example, you've bought a VPS from [Digital
 Ocean](https://www.digitalocean.com/). Then it might be a good idea to
 generate a secret for _digitalocean.com_ then.
 
+### Check configuration
+
+There is a special command for secret verification:
+
+```
+$ mtg doctor /path/to/my/config.toml
+Deprecated options
+  ✅ All good
+Time skewness
+  ✅ Time drift is -607.048µs, but tolerate-time-skewness is 5s
+Validate native network connectivity
+  ✅ DC 1
+  ✅ DC 2
+  ✅ DC 3
+  ✅ DC 4
+  ✅ DC 5
+  ✅ DC 203
+Validate network connectivity with proxy socks5://127.0.0.1:1080
+  ✅ DC 1
+  ✅ DC 2
+  ✅ DC 3
+  ✅ DC 4
+  ✅ DC 5
+  ✅ DC 203
+Validate fronting domain connectivity
+  ✅ xx.xx.xx.xx:yyy is reachable
+Validate SNI-DNS match
+  ✅ IP address xx.xx.xx.xx matches secret hostname <REDACTED>
+```
+
+It aims to find out possible inconsistencies and problems with your
+configuration. It makes sense to run it before executing any relevant commands.
 
 ### Simple run mode
 
@@ -265,7 +364,7 @@ Flags:
   -b, --tcp-buffer="4KB"               Size of TCP buffer to use.
   -i, --prefer-ip="prefer-ipv6"        IP preference. By default we prefer IPv6 with fallback to IPv4.
   -p, --domain-fronting-port=443       A port to access for domain fronting.
-  -n, --doh-ip=9.9.9.9                 IP address of DNS-over-HTTP to use.
+  -n, --doh-ip=1.1.1.1                 IP address of DNS-over-HTTP to use.
   -t, --timeout=10s                    Network timeout to use
   -a, --antireplay-cache-size="1MB"    A size of anti-replay cache to use.
 ```
@@ -307,12 +406,17 @@ Now you can create a systemd unit:
 ```console
 $ cat /etc/systemd/system/mtg.service
 [Unit]
-Description=mtg
+Description=mtg - MTProto proxy server
+Documentation=https://github.com/9seconds/mtg
+After=network.target
 
 [Service]
 ExecStart=/usr/local/bin/mtg run /etc/mtg.toml
 Restart=always
 RestartSec=3
+DynamicUser=true
+LimitNOFILE=65536
+AmbientCapabilities=CAP_NET_BIND_SERVICE
 
 [Install]
 WantedBy=multi-user.target
@@ -324,7 +428,7 @@ $ sudo systemctl start mtg
 or you can run a docker image
 
 ```console
-docker run -d -v /etc/mtg.toml:/config.toml -p 443:3128 --restart=unless-stopped nineseconds/mtg:2
+docker run -d -v $PWD/config.toml:/config.toml -p 443:3128 --name mtg-proxy --restart=unless-stopped nineseconds/mtg:2
 ```
 
 where _443_ is a host port (a port you want to connect to from a
@@ -353,6 +457,61 @@ $ mtg access /etc/mtg.toml
 }
 ```
 
+or if you are using docker:
+
+```console
+$ docker exec mtg-proxy /mtg access /config.toml
+```
+
+## Doppelganger
+
+mtg can mimic real websites, please take a look at relevant section in example
+config file.
+
+mtg comes with some very good precollected statistics coming from
+[ok.ru](https://ok.ru/). It does not mean that you have to cover yourself
+by pretending that mtg is _ok.ru_. **Do not do that: ok.ru comes from very specific
+ASNs, but not from VPS providers you are going to use.** What I want to say
+is that defaults are very good enough to use as is because ok.ru for public
+pages has a very generic profile of TLS packets delay.
+
+But for better results it is recommended to teach mtg about the website you
+will use as a domain front. In order to do that, you need to specify URLs
+from this website. Just go to it, open WebDeveloper console and pick up
+random URLs. For better results they have to be **from the same domain name
+you are going to use as a disguise** but serve light and heavy content: pages,
+images etc. Do not use many, 2-3 will probably work.
+
+mtg will crawl these pages periodically, accumulating statistics and
+using it as you go.
+
+```toml
+[defense.doppelganger]
+urls = [
+  "https://lalala.com/index.html",
+  "https://lalala.com/contacts.html",
+]
+```
+
+This is not very necessary. Keep in mind these rules:
+
+1. If you are not sure what is this all about, do nothing. Defaults are good.
+2. All URLs must be HTTPS
+3. All URLs should be from the same domain name (but this is not a rule)
+4. Do not use a lot of pages. Use _different_ pages. mtg will start using this
+   statistics when it will accumulate enough anyway.
+5. These URLs should be directly accessible from mtg without proxies whatsoever
+6. Do not create huge raids. mtg will repeatedly crawl in raids, making N repeats.
+   Do not use high N, you do not want to be noticeable.
+7. It makes no sense to have small delay between raids. Usually webservers
+   do not update their TLS settings each hour.
+8. If you have some specific knowledge if webserver is using
+   [TLS Dynamic Record Sizing](https://blog.cloudflare.com/optimizing-tls-over-tcp-to-reduce-latency/), you
+   can use a very specific setting. This are Cloudflare, Go standard webservers,
+   [caddy](https://caddyserver.com/) and [H2O](https://h2o.examp1e.net/). If so,
+   you can enable `drs` setting.
+9. **If you are not sure, touch nothing!**
+
 ## Metrics
 
 Out of the box, mtg works with
@@ -367,11 +526,12 @@ Here goes a list of metrics with their types but without a prefix.
 | client_connections          | gauge   | `ip_family`                      | Count of processing client connections.                                                    |
 | telegram_connections        | gauge   | `telegram_ip`, `dc`              | Count of connections to Telegram servers.                                                  |
 | domain_fronting_connections | gauge   | `ip_family`                      | Count of connections to fronting domain.                                                   |
+| iplist_size                 | gauge   | `ip_list`                        | A size of either allowlist or blocklist in use.                                            |
 | telegram_traffic            | counter | `telegram_ip`, `dc`, `direction` | Count of bytes, transmitted to/from Telegram.                                              |
 | domain_fronting_traffic     | counter | `direction`                      | Count of bytes, transmitted to/from fronting domain.                                       |
 | domain_fronting             | counter | –                                | Count of domain fronting events.                                                           |
 | concurrency_limited         | counter | –                                | Count of events, when client connection was rejected due to concurrency limit.             |
-| ip_blocklisted              | counter | –                                | Count of events when client connection was rejected because IP was found in the blacklist. |
+| ip_blocklisted              | counter | `ip_list`                        | Count of events when client connection was rejected because IP was found in the blocklist. |
 | replay_attacks              | counter | –                                | Count of detected replay attacks.                                                          |
 
 Tag meaning:
@@ -382,3 +542,4 @@ Tag meaning:
 | dc          |                            | A number of the Telegram DC for a connection. |
 | telegram_ip |                            | IP address of the Telegram server.            |
 | direction   | `to_client`, `from_client` | A direction of the traffic flow.              |
+| ip_list     | `allowlist`, `blocklist`   | A type of the IP list.                        |

antireplay/init.go

@@ -1,17 +1,17 @@
-// Antireplay package has cache implementations that are effective
-// against replay attacks.
+// Antireplay package has cache implementations that are effective against
+// replay attacks.
 //
-// To understand more about replay attacks, please read documentation
-// for mtglib.AntiReplayCache interface. This package has a list of some
+// To understand more about replay attacks, please read documentation for
+// [mtglib.AntiReplayCache] interface. This package has a list of some
 // implementations of this interface.
 package antireplay
 
 const (
-	// DefaultStableBloomFilterMaxSize is a recommended byte size for a
-	// stable bloom filter.
+	// DefaultStableBloomFilterMaxSize is a recommended byte size for a stable
+	// bloom filter.
 	DefaultStableBloomFilterMaxSize = 1024 * 1024 // 1MiB
 
-	// DefaultStableBloomFilterErrorRate is a recommended default error
-	// rate for a stable bloom filter.
+	// DefaultStableBloomFilterErrorRate is a recommended default error rate for a
+	// stable bloom filter.
 	DefaultStableBloomFilterErrorRate = 0.001
 )

antireplay/noop.go

@@ -6,9 +6,8 @@ type noop struct{}
 
 func (n noop) SeenBefore(_ []byte) bool { return false }
 
-// NewNoop returns an implementation that does nothing. A corresponding
-// method always returns false, so this cache accepts everything you
-// pass to it.
+// NewNoop returns an implementation that does nothing. A corresponding method
+// always returns false, so this cache accepts everything you pass to it.
 func NewNoop() mtglib.AntiReplayCache {
 	return noop{}
 }

antireplay/stable_bloom_filter.go

@@ -20,19 +20,19 @@ func (s *stableBloomFilter) SeenBefore(digest []byte) bool {
 	return s.filter.TestAndAdd(digest)
 }
 
-// NewStableBloomFilter returns an implementation of AntiReplayCache
-// based on stable bloom filter.
+// NewStableBloomFilter returns an implementation of AntiReplayCache based on
+// stable bloom filter.
 //
 // http://webdocs.cs.ualberta.ca/~drafiei/papers/DupDet06Sigmod.pdf
 //
-// The basic idea of a stable bloom filter is quite simple: each time
-// when you set a new element, you randomly reset P elements. There is a
-// hardcore math which proves that if you choose this P correctly, you
-// can maintain the same error rate for a stream of elements.
+// The basic idea of a stable bloom filter is quite simple: each time when you
+// set a new element, you randomly reset P elements. There is a hardcore math
+// which proves that if you choose this P correctly, you can maintain the same
+// error rate for a stream of elements.
 //
 // byteSize is the number of bytes you want to give to a bloom filter.
-// errorRate is desired false-positive error rate. If you want to use
-// default values, please pass 0 for byteSize and <0 for errorRate.
+// errorRate is desired false-positive error rate. If you want to use default
+// values, please pass 0 for byteSize and <0 for errorRate.
 func NewStableBloomFilter(byteSize uint, errorRate float64) mtglib.AntiReplayCache {
 	if byteSize == 0 {
 		byteSize = DefaultStableBloomFilterMaxSize
@@ -42,7 +42,7 @@ func NewStableBloomFilter(byteSize uint, errorRate float64) mtglib.AntiReplayCac
 		errorRate = DefaultStableBloomFilterErrorRate
 	}
 
-	sf := boom.NewDefaultStableBloomFilter(byteSize*8, errorRate) // nolint: gomnd
+	sf := boom.NewDefaultStableBloomFilter(byteSize*8, errorRate)
 	sf.SetHash(xxhash.New64())
 
 	return &stableBloomFilter{

buildinfo.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"runtime/debug"
+	"sort"
+	"strconv"
+	"time"
+)
+
+var version = "dev" // has to be set by ldflags
+
+const (
+	buildInfoModuleStart byte = iota
+	buildInfoModuleFinish
+	buildInfoModuleDelimeter
+)
+
+func getVersion() string {
+	buildInfo, ok := debug.ReadBuildInfo()
+	if !ok {
+		return version
+	}
+
+	date := time.Now()
+	commit := ""
+	goVersion := buildInfo.GoVersion
+	dirtySuffix := ""
+
+	for _, setting := range buildInfo.Settings {
+		switch setting.Key {
+		case "vcs.time":
+			date, _ = time.Parse(time.RFC3339, setting.Value)
+		case "vcs.revision":
+			commit = setting.Value
+		case "vcs.modified":
+			if dirty, _ := strconv.ParseBool(setting.Value); dirty {
+				dirtySuffix = " [dirty]"
+			}
+		}
+	}
+
+	hasher := sha256.New()
+
+	checksumModule := func(mod *debug.Module) {
+		hasher.Write([]byte{buildInfoModuleStart})
+
+		io.WriteString(hasher, mod.Path) //nolint: errcheck
+		hasher.Write([]byte{buildInfoModuleDelimeter})
+
+		io.WriteString(hasher, mod.Version) //nolint: errcheck
+		hasher.Write([]byte{buildInfoModuleDelimeter})
+
+		io.WriteString(hasher, mod.Sum) //nolint: errcheck
+
+		hasher.Write([]byte{buildInfoModuleFinish})
+	}
+
+	io.WriteString(hasher, buildInfo.Path) //nolint: errcheck
+
+	binary.Write(hasher, binary.LittleEndian, uint64(1+len(buildInfo.Deps))) //nolint: errcheck
+
+	sort.Slice(buildInfo.Deps, func(i, j int) bool {
+		return buildInfo.Deps[i].Path > buildInfo.Deps[j].Path
+	})
+
+	checksumModule(&buildInfo.Main)
+
+	for _, module := range buildInfo.Deps {
+		checksumModule(module)
+	}
+
+	return fmt.Sprintf("%s (%s: %s on %s%s, modules checksum %s)",
+		version,
+		goVersion,
+		date.Format(time.RFC3339),
+		commit,
+		dirtySuffix,
+		base64.StdEncoding.EncodeToString(hasher.Sum(nil)))
+}

essentials/addresses.go

@@ -0,0 +1,30 @@
+package essentials
+
+// TelegramCoreAddresses are publicly known addresses of Telegram core network.
+var TelegramCoreAddresses = map[int][]string{
+	1: {
+		"149.154.175.50:443",
+		"[2001:b28:f23d:f001::a]:443",
+	},
+	2: {
+		"149.154.167.51:443",
+		"95.161.76.100:443",
+		"[2001:67c:04e8:f002::a]:443",
+	},
+	3: {
+		"149.154.175.100:443",
+		"[2001:b28:f23d:f003::a]:443",
+	},
+	4: {
+		"149.154.167.91:443",
+		"[2001:67c:04e8:f004::a]:443",
+	},
+	5: {
+		"149.154.171.5:443",
+		"[2001:b28:f23f:f005::a]:443",
+	},
+	203: {
+		"91.105.192.100:443",
+		"[2a0a:f280:0203:000a:5000:0000:0000:0100]:443",
+	},
+}

essentials/conns.go

@@ -5,24 +5,47 @@ import (
 	"net"
 )
 
-// CloseableReader is a reader interface that can close its reading end.
+// CloseableReader is an [io.Reader] interface that can close its reading end.
 type CloseableReader interface {
 	io.Reader
-
 	CloseRead() error
 }
 
-// CloseableWriter is a writer that can close its writing end.
+// CloseableWriter is an [io.Writer] that can close its writing end.
 type CloseableWriter interface {
 	io.Writer
-
 	CloseWrite() error
 }
 
-// Conn is an extension of net.Conn that can close its ends. This mostly
+// Conn is an extension of [net.Conn] that can close its ends. This mostly
 // implies TCP connections.
 type Conn interface {
 	net.Conn
 	CloseableReader
 	CloseableWriter
 }
+
+type netConnWrapper struct {
+	net.Conn
+}
+
+func (n netConnWrapper) CloseRead() error {
+	if conn, ok := n.Conn.(CloseableReader); ok {
+		return conn.CloseRead()
+	}
+
+	return n.Close()
+}
+
+func (n netConnWrapper) CloseWrite() error {
+	if conn, ok := n.Conn.(CloseableWriter); ok {
+		return conn.CloseWrite()
+	}
+
+	return n.Close()
+}
+
+// WrapConn wraps a generic [net.Conn] into Conn.
+func WrapNetConn(conn net.Conn) Conn {
+	return netConnWrapper{conn}
+}

events/event_stream.go

@@ -2,14 +2,14 @@ package events
 
 import (
 	"context"
-	"math/rand"
+	"math/rand/v2"
 	"runtime"
 
 	"github.com/9seconds/mtg/v2/mtglib"
 	"github.com/OneOfOne/xxhash"
 )
 
-// EventStream is a default implementation of the mtglib.EventStream
+// EventStream is a default implementation of the [mtglib.EventStream]
 // interface.
 //
 // EventStream manages a set of goroutines, observers. Main
@@ -38,7 +38,7 @@ func (e EventStream) Send(ctx context.Context, evt mtglib.Event) {
 	select {
 	case <-ctx.Done():
 	case <-e.ctx.Done():
-	case e.chans[int(chanNo)%len(e.chans)] <- evt:
+	case e.chans[chanNo%uint32(len(e.chans))] <- evt:
 	}
 }
 
@@ -64,7 +64,7 @@ func NewEventStream(observerFactories []ObserverFactory) EventStream {
 		chans:     make([]chan mtglib.Event, runtime.NumCPU()),
 	}
 
-	for i := 0; i < runtime.NumCPU(); i++ {
+	for i := range runtime.NumCPU() {
 		rv.chans[i] = make(chan mtglib.Event, 1)
 
 		if len(observerFactories) == 1 {
@@ -77,7 +77,7 @@ func NewEventStream(observerFactories []ObserverFactory) EventStream {
 	return rv
 }
 
-func eventStreamProcessor(ctx context.Context, eventChan <-chan mtglib.Event, observer Observer) { // nolint: cyclop
+func eventStreamProcessor(ctx context.Context, eventChan <-chan mtglib.Event, observer Observer) { //nolint: cyclop
 	defer observer.Shutdown()
 
 	for {
@@ -102,6 +102,8 @@ func eventStreamProcessor(ctx context.Context, eventChan <-chan mtglib.Event, ob
 				observer.EventConcurrencyLimited(typedEvt)
 			case mtglib.EventReplayAttack:
 				observer.EventReplayAttack(typedEvt)
+			case mtglib.EventIPListSize:
+				observer.EventIPListSize(typedEvt)
 			}
 		}
 	}

events/event_stream_test.go

@@ -204,6 +204,27 @@ func (suite *EventStreamTestSuite) TestEventReplayAttack() {
 	time.Sleep(100 * time.Millisecond)
 }
 
+func (suite *EventStreamTestSuite) TestEventIPListSize() {
+	evt := mtglib.NewEventIPListSize(10, true)
+
+	for _, v := range []*ObserverMock{suite.observerMock1, suite.observerMock2} {
+		v.
+			On("EventIPListSize", mock.Anything).
+			Once().
+			Run(func(args mock.Arguments) {
+				caught, ok := args.Get(0).(mtglib.EventIPListSize)
+
+				suite.True(ok)
+				suite.Equal(evt.Timestamp(), caught.Timestamp())
+				suite.Equal(evt.Size, caught.Size)
+				suite.Equal(evt.IsBlockList, caught.IsBlockList)
+			})
+	}
+
+	suite.stream.Send(suite.ctx, evt)
+	time.Sleep(100 * time.Millisecond)
+}
+
 func (suite *EventStreamTestSuite) TearDownTest() {
 	suite.stream.Shutdown()
 	suite.ctxCancel()

events/init.go

@@ -1,19 +1,19 @@
 // Events has a default implementations of EventStream for mtglib.
 //
-// Please see documentation for mtglib.EventStream interface to get an
-// idea of such an abstraction. This package has implementations for the
-// default event stream.
+// Please see documentation for [mtglib.EventStream] interface to get an idea
+// of such an abstraction. This package has implementations for the default
+// event stream.
 //
-// Default event stream has a list of its own concepts. First, all it
-// does is a routing of messages to known observers. It takes an event,
-// defines its type and pass this message to a method of the observer.
+// Default event stream has a list of its own concepts. First, all it does is a
+// routing of messages to known observers. It takes an event, defines its type
+// and pass this message to a method of the observer.
 //
-// There might be many observers, but default event stream has a
-// guarantee though. It uses StreamID as a sharding key and guarantees
-// that a message with the same StreamID will be devlivered to the same
-// observer instance. So, each producer is guarateed to get all relevant
-// messages related to the same session. It is not possible that it will
-// get EventFinish if it has not seen EventStart for that session yet.
+// There might be many observers, but default event stream has a guarantee
+// though. It uses StreamID as a sharding key and guarantees that a message
+// with the same StreamID will be devlivered to the same observer instance. So,
+// each producer is guarateed to get all relevant messages related to the same
+// session. It is not possible that it will get EventFinish if it has not seen
+// EventStart for that session yet.
 package events
 
 import "github.com/9seconds/mtg/v2/mtglib"
@@ -21,10 +21,10 @@ import "github.com/9seconds/mtg/v2/mtglib"
 // Observer is an instance that listens for the incoming events.
 //
 // As it is said in the package description, the default event stream
-// guarantees that all events with the same StreamID are going to be
-// routed to the same instance of the observer. So, there is no need
-// to synchronize information about streams between many observers
-// instances, they can have their local storage.
+// guarantees that all events with the same StreamID are going to be routed to
+// the same instance of the observer. So, there is no need to synchronize
+// information about streams between many observers instances, they can have
+// their local storage.
 type Observer interface {
 	// EventStart reacts on incoming mtglib.EventStart event.
 	EventStart(mtglib.EventStart)
@@ -53,6 +53,9 @@ type Observer interface {
 	// EventReplayAttack reacts on incoming mtglib.EventReplayAttack event.
 	EventReplayAttack(mtglib.EventReplayAttack)
 
+	// EventIPListSize reacts on incoming mtglib.EventIPListSize
+	EventIPListSize(mtglib.EventIPListSize)
+
 	// Shutdown stop observer. Default event stream guarantees:
 	//   1. If shutdown is executed, it is executed only once
 	//   2. Observer won't receieve any new message after this
@@ -62,8 +65,8 @@ type Observer interface {
 
 // ObserverFactory creates a new instance of the observer.
 //
-// Default event stream creates a small set of goroutines to manage
-// incoming messages. Each message is routed to an appropriate observer
-// based on a sharding key, stream id. So, it is possible that an
-// instance of mtg will have many observer instances, not a single one.
+// Default event stream creates a small set of goroutines to manage incoming
+// messages. Each message is routed to an appropriate observer based on a
+// sharding key, stream id. So, it is possible that an instance of mtg will
+// have many observer instances, not a single one.
 type ObserverFactory func() Observer

events/init_test.go

@@ -41,6 +41,10 @@ func (o *ObserverMock) EventReplayAttack(evt mtglib.EventReplayAttack) {
 	o.Called(evt)
 }
 
+func (o *ObserverMock) EventIPListSize(evt mtglib.EventIPListSize) {
+	o.Called(evt)
+}
+
 func (o *ObserverMock) Shutdown() {
 	o.Called()
 }

events/multi_observer.go

@@ -12,14 +12,11 @@ type multiObserver struct {
 
 func (m multiObserver) EventStart(evt mtglib.EventStart) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventStart(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventStart(evt)
+		})
 	}
 
 	wg.Wait()
@@ -27,14 +24,11 @@ func (m multiObserver) EventStart(evt mtglib.EventStart) {
 
 func (m multiObserver) EventConnectedToDC(evt mtglib.EventConnectedToDC) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventConnectedToDC(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventConnectedToDC(evt)
+		})
 	}
 
 	wg.Wait()
@@ -42,14 +36,11 @@ func (m multiObserver) EventConnectedToDC(evt mtglib.EventConnectedToDC) {
 
 func (m multiObserver) EventDomainFronting(evt mtglib.EventDomainFronting) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventDomainFronting(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventDomainFronting(evt)
+		})
 	}
 
 	wg.Wait()
@@ -57,14 +48,11 @@ func (m multiObserver) EventDomainFronting(evt mtglib.EventDomainFronting) {
 
 func (m multiObserver) EventTraffic(evt mtglib.EventTraffic) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventTraffic(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventTraffic(evt)
+		})
 	}
 
 	wg.Wait()
@@ -72,14 +60,11 @@ func (m multiObserver) EventTraffic(evt mtglib.EventTraffic) {
 
 func (m multiObserver) EventFinish(evt mtglib.EventFinish) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventFinish(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventFinish(evt)
+		})
 	}
 
 	wg.Wait()
@@ -87,14 +72,11 @@ func (m multiObserver) EventFinish(evt mtglib.EventFinish) {
 
 func (m multiObserver) EventConcurrencyLimited(evt mtglib.EventConcurrencyLimited) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventConcurrencyLimited(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventConcurrencyLimited(evt)
+		})
 	}
 
 	wg.Wait()
@@ -102,14 +84,11 @@ func (m multiObserver) EventConcurrencyLimited(evt mtglib.EventConcurrencyLimite
 
 func (m multiObserver) EventIPBlocklisted(evt mtglib.EventIPBlocklisted) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventIPBlocklisted(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventIPBlocklisted(evt)
+		})
 	}
 
 	wg.Wait()
@@ -117,14 +96,23 @@ func (m multiObserver) EventIPBlocklisted(evt mtglib.EventIPBlocklisted) {
 
 func (m multiObserver) EventReplayAttack(evt mtglib.EventReplayAttack) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
+		wg.Go(func() {
+			v.EventReplayAttack(evt)
+		})
+	}
 
-			obs.EventReplayAttack(evt)
-		}(v)
+	wg.Wait()
+}
+
+func (m multiObserver) EventIPListSize(evt mtglib.EventIPListSize) {
+	wg := &sync.WaitGroup{}
+
+	for _, v := range m.observers {
+		wg.Go(func() {
+			v.EventIPListSize(evt)
+		})
 	}
 
 	wg.Wait()

events/noop.go

@@ -25,6 +25,7 @@ func (n noopObserver) EventFinish(_ mtglib.EventFinish)
 func (n noopObserver) EventConcurrencyLimited(_ mtglib.EventConcurrencyLimited) {}
 func (n noopObserver) EventIPBlocklisted(_ mtglib.EventIPBlocklisted)           {}
 func (n noopObserver) EventReplayAttack(_ mtglib.EventReplayAttack)             {}
+func (n noopObserver) EventIPListSize(_ mtglib.EventIPListSize)                 {}
 func (n noopObserver) Shutdown()                                                {}
 
 // NewNoopObserver creates an observer which discards each message.

events/noop_test.go

@@ -27,6 +27,7 @@ func (suite *NoopTestSuite) SetupSuite() {
 		"concurrency-limited": mtglib.NewEventConcurrencyLimited(),
 		"ip-blacklisted":      mtglib.NewEventIPBlocklisted(net.ParseIP("10.0.0.10")),
 		"replay-attack":       mtglib.NewEventReplayAttack("connID"),
+		"ip-list-size":        mtglib.NewEventIPListSize(10, true),
 	}
 	suite.ctx = context.Background()
 }
@@ -65,6 +66,8 @@ func (suite *NoopTestSuite) TestObserver() {
 				observer.EventIPBlocklisted(typedEvt)
 			case mtglib.EventReplayAttack:
 				observer.EventReplayAttack(typedEvt)
+			case mtglib.EventIPListSize:
+				observer.EventIPListSize(typedEvt)
 			}
 		})
 	}

example.config.toml

@@ -23,17 +23,19 @@ secret = "ee367a189aee18fa31c190054efd4a8e9573746f726167652e676f6f676c6561706973
 # Host:port pair to run proxy on.
 bind-to = "0.0.0.0:3128"
 
+# This defines what types of traffic mtg listens to. If you are not sure,
+# then definitely keep it disable. Enable it only and only if incoming traffic
+# is coming from some sort of load-balancer like HAProxy or ELB.
+# https://www.haproxy.org/download/2.3/doc/proxy-protocol.txt
+#
+# mtg uses a library that supports v1 and v2 versions of ProxyProtocol.
+# default value is false.
+# proxy-protocol-listener = false
+
 # Defines how many concurrent connections are allowed to this proxy.
 # All other incoming connections are going to be dropped.
 concurrency = 8192
 
-# A size of user-space buffer for TCP to use. Since we do 2 connections,
-# then we have tcp-buffer * (4 + 2) per each connection: read/write for
-# each connection + 2 copy buffers to pump the data between sockets.
-#
-# Deprecated: this setting is no longer makes any effect.
-# tcp-buffer = "4kb"
-
 # Sometimes you want to enforce mtg to use some types of
 # IP connectivity to Telegram. We have 4 modes:
 #   - prefer-ipv6:
@@ -46,9 +48,42 @@ concurrency = 8192
 #     Only ipv4 connectivity is used
 prefer-ip = "prefer-ipv6"
 
+# Public IP addresses of this server. Used by 'mtg access' to generate
+# proxy links and by 'mtg doctor' to validate SNI-DNS match.
+# If not set, mtg tries to detect them automatically via ifconfig.co.
+# Set these if ifconfig.co is unreachable from your server.
+# public-ipv4 = "1.2.3.4"
+# public-ipv6 = "2001:db8::1"
+
+# If this setting is set, then mtg will try to get proxy updates from Telegram
+# Usually this is completely fine to have it disabled, because mtg has a list
+# of some core proxies hardcoded.
+auto-update = false
+
 # FakeTLS uses domain fronting protection. So it needs to know a port to
 # access.
-domain-fronting-port = 443
+#
+# Deprecated: use [domain-fronting] configuration block. If relevant option
+# is defined there, this one would be ignored.
+# domain-fronting-port = 443
+
+# By default, mtg resolves the fronting hostname (from the secret) via DNS
+# to establish a TCP connection. If DNS resolution of that hostname is blocked,
+# you can specify an IP address to connect to directly. The hostname is still
+# used for SNI in the TLS handshake.
+#
+# default value is not set (DNS resolution is used).
+#
+# Deprecated: use [domain-fronting] configuration block. If relevant option
+# is defined there, this one would be ignored.
+# domain-fronting-ip = "10.0.0.10"
+
+# This makes a communication between both fronting website and mtg to use
+# proxy protocol.
+#
+# Deprecated: use [domain-fronting] configuration block. If relevant option
+# is defined there, this one would be ignored.
+# domain-fronting-proxy-protocol = false
 
 # FakeTLS can compare timestamps to prevent probes. Each message has
 # encrypted timestamp. So, mtg can compare this timestamp and decide if
@@ -71,6 +106,27 @@ tolerate-time-skewness = "5s"
 # Otherwise, chose a new DC.
 allow-fallback-on-unknown-dc = false
 
+# This section is relevant to communication with fronting domain. Usually
+# you do not need to setup anything here but there are plenty of cases, especially
+# if you put mtg behind load balancer, when some specific configuration is
+# required.
+[domain-fronting]
+# By default, mtg resolves the fronting hostname (from the secret) via DNS
+# to establish a TCP connection. If DNS resolution of that hostname is blocked,
+# you can specify an IP address to connect to directly. The hostname is still
+# used for SNI in the TLS handshake.
+#
+# default value is not set (DNS resolution is used).
+# ip = "10.10.10.11"
+
+# FakeTLS uses domain fronting protection. So it needs to know a port to
+# access. Default value is 443
+# port = 443
+
+# This makes a communication between both fronting website and mtg to use
+# proxy protocol.
+# proxy-protocol = false
+
 # network defines different network-related settings
 [network]
 # please be aware that mtg needs to do some external requests. For
@@ -84,8 +140,43 @@ allow-fallback-on-unknown-dc = false
 # resolver of the operating system and uses DOH instead. This is a host
 # it has to access.
 #
-# By default we use Quad9.
-doh-ip = "9.9.9.9"
+# By default we use Cloudflare.
+#
+# DEPRECATED option:
+#  If dns option is specified, it will be used instead. No default is defined
+#  anymore. But if you set this option, this is literally the same providing
+#  https:// URL to `dns`.
+#
+#  In other words:
+#
+#    doh-ip = "1.1.1.1"
+#
+# is literally the same as
+#
+#    dns = "https://1.1.1.1"
+# doh-ip = "1.1.1.1"
+
+# Starting from mtg v2.1.12 we have changed a configuration for DNS. Now it
+# supports DNS-over-HTTPS, DNS-over-TLS, custom UDP resolver and system
+# resolver.
+#
+# Here is how to define DNS-over-HTTPS:
+#  - https://1.1.1.1
+#  - https://1.1.1.1/dns-query
+#  - https://cloudflare-dns.com/dns-query
+#  - https://cloudflare-dns.com
+#
+# Here is how to define DNS-over-TLS:
+#  - tls://1.1.1.1
+#  - tls://cloudflare-dns.com
+#
+# Here is how to define a custom UDP resolver (we support only IPs here)
+#  - 1.1.1.1
+#  - udp://1.1.1.1
+#
+# If you set it to empty string, default resolver will be used.
+# But please comment out doh-ip
+dns = "https://1.1.1.1"
 
 # mtg can work via proxies (for now, we support only socks5). Proxy
 # configuration is done via list. So, you can specify many proxies
@@ -100,25 +191,13 @@ doh-ip = "9.9.9.9"
 #
 # Proxy configuration is done via ordinary URI schema:
 #
-#     socks5://user:password@host:port?open_threshold=5&half_open_timeout=1m&reset_failures_timeout=10s
+#     socks5://user:password@host:port
 #
 # Only socks5 proxy is used. user/password is optional. As you can
 # see, you can specify some parameters in GET query. These parameters
 # configure circuit breaker.
-#
-# open_threshold means a number of errors which should happen so we stop
-# use a proxy.
-#
-# half_open_timeout means a time period (in Golang duration notation)
-# after which we can retry with this proxy
-#
-# reset_failures_timeout means a time period when we flush out errors
-# when circuit breaker in closed state.
-#
-# Please see https://docs.microsoft.com/en-us/azure/architecture/patterns/circuit-breaker
-# on details about circuit breakers.
 proxies = [
-    # "socks5://user:password@host:port?open_threshold=5&half_open_timeout=1m&reset_failures_timeout=10s"
+    # "socks5://user:password@host:port"
 ]
 
 # network timeouts define different settings for timeouts. tcp timeout
@@ -134,6 +213,66 @@ tcp = "5s"
 http = "10s"
 idle = "1m"
 
+# mtg has to mimic real websites. It does not mean domain fronting, it also
+# means that traffic characteristics should be similar to real world traffic.
+# websites and applications behave differently, their traffic patterns are also
+# different. Applications do bursts of RPC-style messages (or JSON communication,
+# does not really matter), while websites pump heavy content in HTTP2 streams
+#
+# It means that statistically there is a different between traffic shape:
+# delays between packets are also different.
+# In order to avoid censorship detection based on these patterns, there is a
+# mtg subsystem called "Doppelganger" that aims to mimic website statistics
+# as close as it could.
+#
+# Delays between TLS packets are not constant. There are many factors
+# that come in play. Application should generate some response, it could
+# send some headers first and stream content with chunked encoding. So
+# some first packets could come as soon as possible, with some delays
+# after first ones. Such phenomenon is described by different statistic
+# distribution. There are 2 distribution that describe it: lognormal
+# distribution and Weibul distribution. Lognormal is all about steady streams
+# of heavy content like a video. Weibul is great about short bursts like
+# user who requested a static page an a couple of images.
+[defense.doppelganger]
+# This is a list of URLs that would be crawled by mtg to approximate delay
+# statistics. They MUST be HTTPS urls.
+#
+# You can come to the website and collect different URLs, with light and
+# heavy content. We recommend to search for CDNs.
+urls = [
+    # "https://st-ok.cdn-vk.ru/res/react/vendor/clsx-2.1.1-amd.js"
+]
+# A collection is done in raids. Each raid makes this number of requests to
+# each URL in this list. Do not use a huge number, 10 is probably ok.
+repeats-per-raid = 10
+# This is a duration between each raid. It makes no sense to have a small number
+# here as you would start to make a noticeable activity. Usually traffic patterns
+# do not change a lot, so do not expect different results if you request
+# each 10 minutes.
+raid-each = "6h"
+# This enables dynamic tls record sizing.
+#
+# Some modern stacks and platforms start to use the technique that is called
+# DRS. They start with small TLS packets and ramp up eventually. First packets
+# are usually about MTU size, after that we get 4k and eventually max size.
+# This is done with a good intention: to minimize a time to the first byte,
+# so application could start doing something with the data right after first
+# RTT.
+#
+# Apparently, about 90% of application do not employ this technique, they use
+# max size always: nginx, apache, java stuff. But Golang tools, angie and
+# some specific patches activate this technique.
+#
+# In order to mimic a real website we need to know something about software
+# it uses. Usually nobody cares: openssl does 16384, Python does it, nginx
+# does it. So this setting is disabled by default.
+#
+#      https://blog.cloudflare.com/optimizing-tls-over-tcp-to-reduce-latency/
+#      https://aws.github.io/s2n-tls/usage-guide/ch08-record-sizes.html
+#      https://github.com/cloudflare/sslconfig/blob/master/patches/nginx__dynamic_tls_records.patch
+drs = false
+
 # Some countries do active probing on Telegram connections. This technique
 # allows to protect from such effort.
 #
@@ -170,7 +309,7 @@ download-concurrency = 2
 # You can provider links here (starts with https:// or http://) or
 # path to a local file, but in this case it should be absolute.
 urls = [
-    # "https://iplists.firehol.org/files/firehol_level1.netset",
+    "https://iplists.firehol.org/files/firehol_level1.netset",
     # "/local.file"
 ]
 # How often do we need to update a blocklist set.

go.mod

@@ -1,55 +1,57 @@
 module github.com/9seconds/mtg/v2
 
-go 1.17
+go 1.26
 
 require (
 	github.com/OneOfOne/xxhash v1.2.8
-	github.com/alecthomas/kong v0.2.19
-	github.com/alecthomas/units v0.0.0-20210927113745-59d0afb8317a
+	github.com/alecthomas/kong v1.14.0
+	github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b
 	github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5
 	github.com/babolivier/go-doh-client v0.0.0-20201028162107-a76cff4cb8b6
 	github.com/d4l3k/messagediff v1.2.1 // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/gotd/td v0.34.0
 	github.com/jarcoal/httpmock v1.0.8
-	github.com/kentik/patricia v0.0.0-20210909164817-21603333b70e
 	github.com/mccutchen/go-httpbin v1.1.1
-	github.com/panjf2000/ants/v2 v2.4.6
-	github.com/pelletier/go-toml v1.9.4
-	github.com/prometheus/client_golang v1.11.0
-	github.com/prometheus/common v0.32.1 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
-	github.com/rs/zerolog v1.26.0
-	github.com/smira/go-statsd v1.3.2
-	github.com/stretchr/objx v0.3.0 // indirect
-	github.com/stretchr/testify v1.7.0
-	github.com/tylertreat/BoomFilters v0.0.0-20210315201527-1a82519a3e43
-	golang.org/x/crypto v0.0.0-20211117183948-ae814b36b871
-	golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2 // indirect
-	golang.org/x/sys v0.0.0-20211124211545-fe61309f8881
-	google.golang.org/protobuf v1.27.1 // indirect
+	github.com/panjf2000/ants/v2 v2.12.0
+	github.com/prometheus/client_golang v1.23.2
+	github.com/prometheus/common v0.67.5 // indirect
+	github.com/prometheus/procfs v0.20.1 // indirect
+	github.com/rs/zerolog v1.35.0
+	github.com/smira/go-statsd v1.3.4
+	github.com/stretchr/objx v0.5.2 // indirect
+	github.com/stretchr/testify v1.11.1
+	github.com/tylertreat/BoomFilters v0.0.0-20251117164519-53813c36cc1b
+	golang.org/x/crypto v0.49.0
+	golang.org/x/net v0.52.0
+	golang.org/x/sys v0.42.0
+	google.golang.org/protobuf v1.36.11 // indirect
 )
 
-require github.com/txthinking/socks5 v0.0.0-20211121111206-e03c1217a50b
+require (
+	github.com/beevik/ntp v1.5.0
+	github.com/ncruces/go-dns v1.3.2
+	github.com/pelletier/go-toml/v2 v2.3.0
+	github.com/pires/go-proxyproto v0.11.0
+	github.com/things-go/go-socks5 v0.1.0
+	github.com/txthinking/socks5 v0.0.0-20251011041537-5c31f201a10e
+	github.com/yl2chen/cidranger v1.0.2
+)
 
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cenkalti/backoff/v4 v4.1.0 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/gotd/ige v0.1.5 // indirect
-	github.com/gotd/xor v0.1.1 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/klauspost/compress v1.18.3 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/txthinking/runnergroup v0.0.0-20210608031112-152c7c4432bf // indirect
-	github.com/txthinking/x v0.0.0-20210326105829-476fab902fbe // indirect
-	go.uber.org/atomic v1.7.0 // indirect
-	go.uber.org/multierr v1.6.0 // indirect
-	go.uber.org/zap v1.16.0 // indirect
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	github.com/txthinking/runnergroup v0.0.0-20250224021307-5864ffeb65ae // indirect
+	go.yaml.in/yaml/v2 v2.4.4 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/tools v0.41.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,580 +1,155 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
-cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
-cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
-cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
-cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
-cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
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-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
-cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
-cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
-cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
-cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
-cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/OneOfOne/xxhash v1.2.8 h1:31czK/TI9sNkxIKfaUfGlU47BAxQ0ztGgd9vPyqimf8=
 github.com/OneOfOne/xxhash v1.2.8/go.mod h1:eZbhyaAYD41SGSSsnmcpxVoRiQ/MPUTjUdIIOT9Um7Q=
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 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/babolivier/go-doh-client v0.0.0-20201028162107-a76cff4cb8b6 h1:4NNbNM2Iq/k57qEu7WfL67UrbPq1uFWxW4qODCohi+0=
 github.com/babolivier/go-doh-client v0.0.0-20201028162107-a76cff4cb8b6/go.mod h1:J29hk+f9lJrblVIfiJOtTFk+OblBawmib4uz/VdKzlg=
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 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
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-github.com/cenkalti/backoff/v4 v4.1.0/go.mod h1:scbssz8iZGpm3xbr14ovlUdkxfGXNInqkPWOWmG2CLw=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
-github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
-github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
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 github.com/d4l3k/messagediff v1.2.1 h1:ZcAIMYsUg0EAp9X+tt8/enBE/Q8Yd5kzPynLyKptt9U=
 github.com/d4l3k/messagediff v1.2.1/go.mod h1:Oozbb1TVXFac9FtSIxHBMnBCq2qeH/2KkEQxENCrlLo=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
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-github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
-github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
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internal/cli/access.go

@@ -1,22 +1,16 @@
 package cli
 
 import (
-	"context"
 	"encoding/json"
 	"fmt"
-	"io"
 	"net"
-	"net/http"
 	"net/url"
 	"os"
 	"strconv"
-	"strings"
 	"sync"
 
-	"github.com/9seconds/mtg/v2/essentials"
 	"github.com/9seconds/mtg/v2/internal/config"
 	"github.com/9seconds/mtg/v2/internal/utils"
-	"github.com/9seconds/mtg/v2/mtglib"
 )
 
 type accessResponse struct {
@@ -31,17 +25,17 @@ type accessResponse struct {
 type accessResponseURLs struct {
 	IP        net.IP `json:"ip"`
 	Port      uint   `json:"port"`
-	TgURL     string `json:"tg_url"`     // nolint: tagliatelle
-	TgQrCode  string `json:"tg_qrcode"`  // nolint: tagliatelle
-	TmeURL    string `json:"tme_url"`    // nolint: tagliatelle
-	TmeQrCode string `json:"tme_qrcode"` // nolint: tagliatelle
+	TgURL     string `json:"tg_url"`     //nolint: tagliatelle
+	TgQrCode  string `json:"tg_qrcode"`  //nolint: tagliatelle
+	TmeURL    string `json:"tme_url"`    //nolint: tagliatelle
+	TmeQrCode string `json:"tme_qrcode"` //nolint: tagliatelle
 }
 
 type Access struct {
-	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"`                 // nolint: lll
-	PublicIPv4 net.IP `kong:"help='Public IPv4 address for proxy. By default it is resolved via remote website',name='ipv4',short='i'"`   // nolint: lll
-	PublicIPv6 net.IP `kong:"help='Public IPv6 address for proxy. By default it is resolved via remote website',name='ipv6',short='I'"`   // nolint: lll
-	Port       uint   `kong:"help='Port number. Default port is taken from configuration file, bind-to parameter',type:'uint',short='p'"` // nolint: lll
+	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"`                 //nolint: lll
+	PublicIPv4 net.IP `kong:"help='Public IPv4 address for proxy. By default it is resolved via remote website',name='ipv4',short='i'"`   //nolint: lll
+	PublicIPv6 net.IP `kong:"help='Public IPv6 address for proxy. By default it is resolved via remote website',name='ipv6',short='I'"`   //nolint: lll
+	Port       uint   `kong:"help='Port number. Default port is taken from configuration file, bind-to parameter',type:'uint',short='p'"` //nolint: lll
 	Hex        bool   `kong:"help='Print secret in hex encoding.',short='x'"`
 }
 
@@ -61,14 +55,14 @@ func (a *Access) Run(cli *CLI, version string) error {
 	}
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2) // nolint: gomnd
-
-	go func() {
-		defer wg.Done()
 
+	wg.Go(func() {
 		ip := a.PublicIPv4
 		if ip == nil {
-			ip = a.getIP(ntw, "tcp4")
+			ip = conf.PublicIPv4.Get(nil)
+		}
+		if ip == nil {
+			ip = getIP(ntw, "tcp4")
 		}
 
 		if ip != nil {
@@ -76,14 +70,14 @@ func (a *Access) Run(cli *CLI, version string) error {
 		}
 
 		resp.IPv4 = a.makeURLs(conf, ip)
-	}()
-
-	go func() {
-		defer wg.Done()
-
+	})
+	wg.Go(func() {
 		ip := a.PublicIPv6
 		if ip == nil {
-			ip = a.getIP(ntw, "tcp6")
+			ip = conf.PublicIPv6.Get(nil)
+		}
+		if ip == nil {
+			ip = getIP(ntw, "tcp6")
 		}
 
 		if ip != nil {
@@ -91,7 +85,7 @@ func (a *Access) Run(cli *CLI, version string) error {
 		}
 
 		resp.IPv6 = a.makeURLs(conf, ip)
-	}()
+	})
 
 	wg.Wait()
 
@@ -106,40 +100,6 @@ func (a *Access) Run(cli *CLI, version string) error {
 	return nil
 }
 
-func (a *Access) getIP(ntw mtglib.Network, protocol string) net.IP {
-	client := ntw.MakeHTTPClient(func(ctx context.Context, network, address string) (essentials.Conn, error) {
-		return ntw.DialContext(ctx, protocol, address) // nolint: wrapcheck
-	})
-
-	req, err := http.NewRequest(http.MethodGet, "https://ifconfig.co", nil) // nolint: noctx
-	if err != nil {
-		panic(err)
-	}
-
-	req.Header.Add("Accept", "text/plain")
-
-	resp, err := client.Do(req)
-	if err != nil {
-		return nil
-	}
-
-	if resp.StatusCode != http.StatusOK {
-		return nil
-	}
-
-	defer func() {
-		io.Copy(io.Discard, resp.Body) // nolint: errcheck
-		resp.Body.Close()
-	}()
-
-	data, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil
-	}
-
-	return net.ParseIP(strings.TrimSpace(string(data)))
-}
-
 func (a *Access) makeURLs(conf *config.Config, ip net.IP) *accessResponseURLs {
 	if ip == nil {
 		return nil

internal/cli/cli.go

@@ -4,6 +4,7 @@ import "github.com/alecthomas/kong"
 
 type CLI struct {
 	GenerateSecret GenerateSecret   `kong:"cmd,help='Generate new proxy secret'"`
+	Doctor         Doctor           `kong:"cmd,help='Check that proxy can run correctly'"`
 	Access         Access           `kong:"cmd,help='Print access information.'"`
 	Run            Run              `kong:"cmd,help='Run proxy.'"`
 	SimpleRun      SimpleRun        `kong:"cmd,help='Run proxy without config file.'"`

internal/cli/doctor.go

@@ -0,0 +1,375 @@
+package cli
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"maps"
+	"net"
+	"os"
+	"slices"
+	"strconv"
+	"strings"
+	"text/template"
+	"time"
+
+	"github.com/9seconds/mtg/v2/essentials"
+	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/9seconds/mtg/v2/internal/utils"
+	"github.com/9seconds/mtg/v2/mtglib"
+	"github.com/9seconds/mtg/v2/network/v2"
+	"github.com/beevik/ntp"
+)
+
+var (
+	tplError = template.Must(
+		template.New("").Parse("  ‼️ {{ .description }}: {{ .error }}\n"),
+	)
+
+	tplWDeprecatedConfig = template.Must(
+		template.New("").
+			Parse(`  ⚠️ Option {{ .old | printf "%q" }}{{ if .old_section }} from section [{{ .old_section }}]{{ end }} is deprecated and will be removed in v{{ .when }}. Please use {{ .new | printf "%q" }}{{ if .new_section }} in [{{ .new_section }}] section{{ end }} instead.` + "\n"),
+	)
+
+	tplOTimeSkewness = template.Must(
+		template.New("").
+			Parse("  ✅ Time drift is {{ .drift }}, but tolerate-time-skewness is {{ .value }}\n"),
+	)
+	tplWTimeSkewness = template.Must(
+		template.New("").
+			Parse("  ⚠️ Time drift is {{ .drift }}, but tolerate-time-skewness is {{ .value }}. Please check ntp.\n"),
+	)
+	tplETimeSkewness = template.Must(
+		template.New("").
+			Parse("  ❌ Time drift is {{ .drift }}, but tolerate-time-skewness is {{ .value }}. You will get many rejected connections!\n"),
+	)
+
+	tplODCConnect = template.Must(
+		template.New("").Parse("  ✅ DC {{ .dc }}\n"),
+	)
+	tplEDCConnect = template.Must(
+		template.New("").Parse("  ❌ DC {{ .dc }}: {{ .error }}\n"),
+	)
+
+	tplODNSSNIMatch = template.Must(
+		template.New("").Parse("  ✅ IP address {{ .ip }} matches secret hostname {{ .hostname }}\n"),
+	)
+	tplEDNSSNIMatch = template.Must(
+		template.New("").Parse("  ❌ Hostname {{ .hostname }} {{ if .resolved }}is resolved to {{ .resolved }} addresses, not {{ if .ip4 }}{{ .ip4 }}{{ else }}{{ .ip6 }}{{ end }}{{ else }}cannot be resolved to any host{{ end }}\n"),
+	)
+
+	tplOFrontingDomain = template.Must(
+		template.New("").Parse("  ✅ {{ .address }} is reachable\n"),
+	)
+	tplEFrontingDomain = template.Must(
+		template.New("").Parse("  ❌ {{ .address }}: {{ .error }}\n"),
+	)
+)
+
+type Doctor struct {
+	conf *config.Config
+
+	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"` //nolint: lll
+}
+
+func (d *Doctor) Run(cli *CLI, version string) error {
+	conf, err := utils.ReadConfig(d.ConfigPath)
+	if err != nil {
+		return fmt.Errorf("cannot init config: %w", err)
+	}
+
+	d.conf = conf
+
+	fmt.Println("Deprecated options")
+	everythingOK := d.checkDeprecatedConfig()
+
+	fmt.Println("Time skewness")
+	everythingOK = d.checkTimeSkewness() && everythingOK
+
+	resolver, err := network.GetDNS(conf.GetDNS())
+	if err != nil {
+		return fmt.Errorf("cannot create DNS resolver: %w", err)
+	}
+
+	base := network.New(
+		resolver,
+		"",
+		conf.Network.Timeout.TCP.Get(10*time.Second),
+		conf.Network.Timeout.HTTP.Get(0),
+		conf.Network.Timeout.Idle.Get(0),
+	)
+
+	fmt.Println("Validate native network connectivity")
+	everythingOK = d.checkNetwork(base) && everythingOK
+
+	for _, url := range conf.Network.Proxies {
+		value, err := network.NewProxyNetwork(base, url.Get(nil))
+		if err != nil {
+			return err
+		}
+
+		fmt.Printf("Validate network connectivity with proxy %s\n", url.Get(nil))
+		everythingOK = d.checkNetwork(value) && everythingOK
+	}
+
+	fmt.Println("Validate fronting domain connectivity")
+	everythingOK = d.checkFrontingDomain(base) && everythingOK
+
+	fmt.Println("Validate SNI-DNS match")
+	everythingOK = d.checkSecretHost(resolver, base) && everythingOK
+
+	if !everythingOK {
+		os.Exit(1)
+	}
+
+	return nil
+}
+
+func (d *Doctor) checkDeprecatedConfig() bool {
+	ok := true
+
+	if d.conf.DomainFrontingIP.Value != nil {
+		ok = false
+		tplWDeprecatedConfig.Execute(os.Stdout, map[string]string{ //nolint: errcheck
+			"when":        "2.3.0",
+			"old":         "domain-fronting-ip",
+			"old_section": "",
+			"new":         "ip",
+			"new_section": "domain-fronting",
+		})
+	}
+
+	if d.conf.DomainFrontingPort.Value != 0 {
+		ok = false
+		tplWDeprecatedConfig.Execute(os.Stdout, map[string]string{ //nolint: errcheck
+			"when":        "2.3.0",
+			"old":         "domain-fronting-port",
+			"old_section": "",
+			"new":         "port",
+			"new_section": "domain-fronting",
+		})
+	}
+
+	if d.conf.DomainFrontingProxyProtocol.Value {
+		ok = false
+		tplWDeprecatedConfig.Execute(os.Stdout, map[string]string{ //nolint: errcheck
+			"when":        "2.3.0",
+			"old":         "domain-fronting-proxy-protocol",
+			"old_section": "",
+			"new":         "proxy-protocol",
+			"new_section": "domain-fronting",
+		})
+	}
+
+	if d.conf.Network.DOHIP.Value != nil {
+		ok = false
+		tplWDeprecatedConfig.Execute(os.Stdout, map[string]string{ //nolint: errcheck
+			"when":        "2.3.0",
+			"old":         "doh-ip",
+			"old_section": "network",
+			"new":         "dns",
+			"new_section": "network",
+		})
+	}
+
+	if ok {
+		fmt.Println("  ✅ All good")
+	}
+
+	return ok
+}
+
+func (d *Doctor) checkTimeSkewness() bool {
+	response, err := ntp.Query("0.pool.ntp.org")
+	if err != nil {
+		tplError.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+			"description": "cannot access ntp pool",
+			"error":       err,
+		})
+		return false
+	}
+
+	skewness := response.ClockOffset.Abs()
+	confValue := d.conf.TolerateTimeSkewness.Get(mtglib.DefaultTolerateTimeSkewness)
+	diff := float64(skewness) / float64(confValue)
+	tplData := map[string]any{
+		"drift": response.ClockOffset,
+		"value": confValue,
+	}
+
+	switch {
+	case diff < 0.3:
+		tplOTimeSkewness.Execute(os.Stdout, tplData) //nolint: errcheck
+		return true
+	case diff < 0.7:
+		tplWTimeSkewness.Execute(os.Stdout, tplData) //nolint: errcheck
+	default:
+		tplETimeSkewness.Execute(os.Stdout, tplData) //nolint: errcheck
+	}
+
+	return false
+}
+
+func (d *Doctor) checkNetwork(ntw mtglib.Network) bool {
+	dcs := slices.Collect(maps.Keys(essentials.TelegramCoreAddresses))
+	slices.Sort(dcs)
+
+	ok := true
+
+	for _, dc := range dcs {
+		err := d.checkNetworkAddresses(ntw, essentials.TelegramCoreAddresses[dc])
+		if err == nil {
+			tplODCConnect.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+				"dc": dc,
+			})
+		} else {
+			tplEDCConnect.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+				"dc":    dc,
+				"error": err,
+			})
+			ok = false
+		}
+	}
+
+	return ok
+}
+
+func (d *Doctor) checkNetworkAddresses(ntw mtglib.Network, addresses []string) error {
+	checkAddresses := []string{}
+
+	switch d.conf.PreferIP.Get("prefer-ip4") {
+	case "only-ipv4":
+		for _, addr := range addresses {
+			host, _, err := net.SplitHostPort(addr)
+			if err != nil {
+				panic(err)
+			}
+
+			if ip := net.ParseIP(host); ip != nil && ip.To4() != nil {
+				checkAddresses = append(checkAddresses, addr)
+			}
+		}
+	case "only-ipv6":
+		for _, addr := range addresses {
+			host, _, err := net.SplitHostPort(addr)
+			if err != nil {
+				panic(err)
+			}
+
+			if ip := net.ParseIP(host); ip != nil && ip.To4() == nil {
+				checkAddresses = append(checkAddresses, addr)
+			}
+		}
+	default:
+		checkAddresses = addresses
+	}
+
+	if len(checkAddresses) == 0 {
+		return fmt.Errorf("no suitable addresses after IP version filtering")
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	var (
+		conn net.Conn
+		err  error
+	)
+
+	for _, addr := range checkAddresses {
+		conn, err = ntw.DialContext(ctx, "tcp", addr)
+		if err != nil {
+			continue
+		}
+
+		conn.Close() //nolint: errcheck
+
+		return nil
+	}
+
+	return err
+}
+
+func (d *Doctor) checkFrontingDomain(ntw mtglib.Network) bool {
+	host := d.conf.Secret.Host
+	if ip := d.conf.GetDomainFrontingIP(nil); ip != "" {
+		host = ip
+	}
+
+	port := d.conf.GetDomainFrontingPort(mtglib.DefaultDomainFrontingPort)
+	address := net.JoinHostPort(host, strconv.Itoa(int(port)))
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	dialer := ntw.NativeDialer()
+
+	conn, err := dialer.DialContext(ctx, "tcp", address)
+	if err != nil {
+		tplEFrontingDomain.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+			"address": address,
+			"error":   err,
+		})
+		return false
+	}
+
+	conn.Close() //nolint: errcheck
+
+	tplOFrontingDomain.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+		"address": address,
+	})
+
+	return true
+}
+
+func (d *Doctor) checkSecretHost(resolver *net.Resolver, ntw mtglib.Network) bool {
+	addresses, err := resolver.LookupIPAddr(context.Background(), d.conf.Secret.Host)
+	if err != nil {
+		tplError.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+			"description": fmt.Sprintf("cannot resolve DNS name of %s", d.conf.Secret.Host),
+			"error":       err,
+		})
+		return false
+	}
+
+	ourIP4 := d.conf.PublicIPv4.Get(nil)
+	if ourIP4 == nil {
+		ourIP4 = getIP(ntw, "tcp4")
+	}
+
+	ourIP6 := d.conf.PublicIPv6.Get(nil)
+	if ourIP6 == nil {
+		ourIP6 = getIP(ntw, "tcp6")
+	}
+
+	if ourIP4 == nil && ourIP6 == nil {
+		tplError.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+			"description": "cannot detect public IP address",
+			"error":       errors.New("cannot detect automatically and public-ipv4/public-ipv6 are not set in config"),
+		})
+		return false
+	}
+
+	strAddresses := []string{}
+	for _, value := range addresses {
+		if (ourIP4 != nil && value.IP.String() == ourIP4.String()) ||
+			(ourIP6 != nil && value.IP.String() == ourIP6.String()) {
+			tplODNSSNIMatch.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+				"ip":       value.IP,
+				"hostname": d.conf.Secret.Host,
+			})
+			return true
+		}
+
+		strAddresses = append(strAddresses, `"`+value.IP.String()+`"`)
+	}
+
+	tplEDNSSNIMatch.Execute(os.Stdout, map[string]any{ //nolint: errcheck
+		"hostname": d.conf.Secret.Host,
+		"resolved": strings.Join(strAddresses, ", "),
+		"ip4":      ourIP4,
+		"ip6":      ourIP6,
+	})
+
+	return false
+}

internal/cli/generate_secret.go

@@ -15,9 +15,9 @@ func (g *GenerateSecret) Run(cli *CLI, _ string) error {
 	secret := mtglib.GenerateSecret(cli.GenerateSecret.HostName)
 
 	if g.Hex {
-		fmt.Println(secret.Hex()) // nolint: forbidigo
+		fmt.Println(secret.Hex()) //nolint: forbidigo
 	} else {
-		fmt.Println(secret.Base64()) // nolint: forbidigo
+		fmt.Println(secret.Base64()) //nolint: forbidigo
 	}
 
 	return nil

internal/cli/run.go

@@ -7,7 +7,7 @@ import (
 )
 
 type Run struct {
-	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"` // nolint: lll
+	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"` //nolint: lll
 }
 
 func (r *Run) Run(cli *CLI, version string) error {

internal/cli/run_proxy.go

@@ -1,21 +1,26 @@
 package cli
 
 import (
+	"context"
 	"fmt"
 	"net"
-	"net/url"
 	"os"
+	"time"
 
 	"github.com/9seconds/mtg/v2/antireplay"
 	"github.com/9seconds/mtg/v2/events"
 	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/9seconds/mtg/v2/internal/proxyprotocol"
 	"github.com/9seconds/mtg/v2/internal/utils"
 	"github.com/9seconds/mtg/v2/ipblocklist"
+	"github.com/9seconds/mtg/v2/ipblocklist/files"
 	"github.com/9seconds/mtg/v2/logger"
 	"github.com/9seconds/mtg/v2/mtglib"
-	"github.com/9seconds/mtg/v2/network"
+	"github.com/9seconds/mtg/v2/network/v2"
 	"github.com/9seconds/mtg/v2/stats"
+	"github.com/pires/go-proxyproto"
 	"github.com/rs/zerolog"
+	"github.com/yl2chen/cidranger"
 )
 
 func makeLogger(conf *config.Config) mtglib.Logger {
@@ -35,43 +40,41 @@ func makeLogger(conf *config.Config) mtglib.Logger {
 }
 
 func makeNetwork(conf *config.Config, version string) (mtglib.Network, error) {
-	tcpTimeout := conf.Network.Timeout.TCP.Get(network.DefaultTimeout)
-	httpTimeout := conf.Network.Timeout.HTTP.Get(network.DefaultHTTPTimeout)
-	dohIP := conf.Network.DOHIP.Get(net.ParseIP(network.DefaultDOHHostname)).String()
-	userAgent := "mtg/" + version
-
-	baseDialer, err := network.NewDefaultDialer(tcpTimeout, 0)
+	resolver, err := network.GetDNS(conf.GetDNS())
 	if err != nil {
-		return nil, fmt.Errorf("cannot build a default dialer: %w", err)
+		return nil, fmt.Errorf("cannot create DNS resolver: %w", err)
 	}
 
-	if len(conf.Network.Proxies) == 0 {
-		return network.NewNetwork(baseDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
-	}
+	base := network.New(
+		resolver,
+		"",
+		conf.Network.Timeout.TCP.Get(0),
+		conf.Network.Timeout.HTTP.Get(0),
+		conf.Network.Timeout.Idle.Get(0),
+	)
 
-	proxyURLs := make([]*url.URL, 0, len(conf.Network.Proxies))
-
-	for _, v := range conf.Network.Proxies {
-		if value := v.Get(nil); value != nil {
-			proxyURLs = append(proxyURLs, value)
-		}
-	}
-
-	if len(proxyURLs) == 1 {
-		socksDialer, err := network.NewSocks5Dialer(baseDialer, proxyURLs[0])
+	proxyDialers := make([]mtglib.Network, len(conf.Network.Proxies))
+	for idx, v := range conf.Network.Proxies {
+		value, err := network.NewProxyNetwork(base, v.Get(nil))
 		if err != nil {
-			return nil, fmt.Errorf("cannot build socks5 dialer: %w", err)
+			return nil, fmt.Errorf("cannot use %v for proxy url: %w", v.Get(nil), err)
 		}
-
-		return network.NewNetwork(socksDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
+		proxyDialers[idx] = value
 	}
 
-	socksDialer, err := network.NewLoadBalancedSocks5Dialer(baseDialer, proxyURLs)
+	switch len(proxyDialers) {
+	case 0:
+		return base, nil
+	case 1:
+		return proxyDialers[0], nil
+	}
+
+	value, err := network.Join(proxyDialers...)
 	if err != nil {
-		return nil, fmt.Errorf("cannot build socks5 dialer: %w", err)
+		panic(err)
 	}
 
-	return network.NewNetwork(socksDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
+	return value, nil
 }
 
 func makeAntiReplayCache(conf *config.Config) mtglib.AntiReplayCache {
@@ -85,7 +88,11 @@ func makeAntiReplayCache(conf *config.Config) mtglib.AntiReplayCache {
 	)
 }
 
-func makeIPBlocklist(conf config.ListConfig, logger mtglib.Logger, ntw mtglib.Network) (mtglib.IPBlocklist, error) {
+func makeIPBlocklist(conf config.ListConfig,
+	logger mtglib.Logger,
+	ntw mtglib.Network,
+	updateCallback ipblocklist.FireholUpdateCallback,
+) (mtglib.IPBlocklist, error) {
 	if !conf.Enabled.Get(false) {
 		return ipblocklist.NewNoop(), nil
 	}
@@ -101,20 +108,63 @@ func makeIPBlocklist(conf config.ListConfig, logger mtglib.Logger, ntw mtglib.Ne
 		}
 	}
 
-	firehol, err := ipblocklist.NewFirehol(logger.Named("ipblockist"),
+	blocklist, err := ipblocklist.NewFirehol(logger.Named("ipblockist"),
 		ntw,
 		conf.DownloadConcurrency.Get(1),
 		remoteURLs,
-		localFiles)
+		localFiles,
+		updateCallback)
 	if err != nil {
 		return nil, fmt.Errorf("incorrect parameters for firehol: %w", err)
 	}
 
-	return firehol, nil
+	go blocklist.Run(conf.UpdateEach.Get(ipblocklist.DefaultFireholUpdateEach))
+
+	return blocklist, nil
+}
+
+func makeIPAllowlist(conf config.ListConfig,
+	logger mtglib.Logger,
+	ntw mtglib.Network,
+	updateCallback ipblocklist.FireholUpdateCallback,
+) (mtglib.IPBlocklist, error) {
+	var (
+		allowlist mtglib.IPBlocklist
+		err       error
+	)
+
+	if !conf.Enabled.Get(false) {
+		allowlist, err = ipblocklist.NewFireholFromFiles(
+			logger.Named("ipblocklist"),
+			1,
+			[]files.File{
+				files.NewMem([]*net.IPNet{
+					cidranger.AllIPv4,
+					cidranger.AllIPv6,
+				}),
+			},
+			updateCallback,
+		)
+
+		go allowlist.Run(conf.UpdateEach.Get(ipblocklist.DefaultFireholUpdateEach))
+	} else {
+		allowlist, err = makeIPBlocklist(
+			conf,
+			logger,
+			ntw,
+			updateCallback,
+		)
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("cannot build allowlist: %w", err)
+	}
+
+	return allowlist, nil
 }
 
 func makeEventStream(conf *config.Config, logger mtglib.Logger) (mtglib.EventStream, error) {
-	factories := make([]events.ObserverFactory, 0, 2) // nolint: gomnd
+	factories := make([]events.ObserverFactory, 0, 2)
 
 	if conf.Stats.StatsD.Enabled.Get(false) {
 		statsdFactory, err := stats.NewStatsd(
@@ -140,7 +190,7 @@ func makeEventStream(conf *config.Config, logger mtglib.Logger) (mtglib.EventStr
 			return nil, fmt.Errorf("cannot start a listener for prometheus: %w", err)
 		}
 
-		go prometheus.Serve(listener) // nolint: errcheck
+		go prometheus.Serve(listener) //nolint: errcheck
 
 		factories = append(factories, prometheus.Make)
 	}
@@ -152,35 +202,47 @@ func makeEventStream(conf *config.Config, logger mtglib.Logger) (mtglib.EventStr
 	return events.NewNoopStream(), nil
 }
 
-func runProxy(conf *config.Config, version string) error { // nolint: funlen
+func runProxy(conf *config.Config, version string) error { //nolint: funlen
 	logger := makeLogger(conf)
 
 	logger.BindJSON("configuration", conf.String()).Debug("configuration")
 
+	eventStream, err := makeEventStream(conf, logger)
+	if err != nil {
+		return fmt.Errorf("cannot build event stream: %w", err)
+	}
+
 	ntw, err := makeNetwork(conf, version)
 	if err != nil {
 		return fmt.Errorf("cannot build network: %w", err)
 	}
 
-	blocklist, err := makeIPBlocklist(conf.Defense.Blocklist, logger, ntw)
+	blocklist, err := makeIPBlocklist(
+		conf.Defense.Blocklist,
+		logger.Named("blocklist"),
+		ntw,
+		func(ctx context.Context, size int) {
+			eventStream.Send(ctx, mtglib.NewEventIPListSize(size, true))
+		})
 	if err != nil {
 		return fmt.Errorf("cannot build ip blocklist: %w", err)
 	}
 
-	var whitelist mtglib.IPBlocklist
-
-	if conf.Defense.Allowlist.Enabled.Get(false) {
-		whlist, err := makeIPBlocklist(conf.Defense.Allowlist, logger, ntw)
-		if err != nil {
-			return fmt.Errorf("cannot build ip blocklist: %w", err)
-		}
-
-		whitelist = whlist
+	allowlist, err := makeIPAllowlist(
+		conf.Defense.Allowlist,
+		logger.Named("allowlist"),
+		ntw,
+		func(ctx context.Context, size int) {
+			eventStream.Send(ctx, mtglib.NewEventIPListSize(size, false))
+		},
+	)
+	if err != nil {
+		return fmt.Errorf("cannot build ip allowlist: %w", err)
 	}
 
-	eventStream, err := makeEventStream(conf, logger)
-	if err != nil {
-		return fmt.Errorf("cannot build event stream: %w", err)
+	doppelGangerURLs := make([]string, len(conf.Defense.Doppelganger.URLs))
+	for i, v := range conf.Defense.Doppelganger.URLs {
+		doppelGangerURLs[i] = v.String()
 	}
 
 	opts := mtglib.ProxyOpts{
@@ -188,15 +250,25 @@ func runProxy(conf *config.Config, version string) error { // nolint: funlen
 		Network:         ntw,
 		AntiReplayCache: makeAntiReplayCache(conf),
 		IPBlocklist:     blocklist,
-		IPWhitelist:     whitelist,
+		IPAllowlist:     allowlist,
 		EventStream:     eventStream,
 
-		Secret:             conf.Secret,
-		DomainFrontingPort: conf.DomainFrontingPort.Get(mtglib.DefaultDomainFrontingPort),
-		PreferIP:           conf.PreferIP.Get(mtglib.DefaultPreferIP),
+		Secret:                      conf.Secret,
+		Concurrency:                 conf.GetConcurrency(mtglib.DefaultConcurrency),
+		DomainFrontingPort:          conf.GetDomainFrontingPort(mtglib.DefaultDomainFrontingPort),
+		DomainFrontingIP:            conf.GetDomainFrontingIP(nil),
+		DomainFrontingProxyProtocol: conf.GetDomainFrontingProxyProtocol(false),
+		PreferIP:                    conf.PreferIP.Get(mtglib.DefaultPreferIP),
+		AutoUpdate:                  conf.AutoUpdate.Get(false),
 
 		AllowFallbackOnUnknownDC: conf.AllowFallbackOnUnknownDC.Get(false),
 		TolerateTimeSkewness:     conf.TolerateTimeSkewness.Value,
+		IdleTimeout:              conf.Network.Timeout.Idle.Get(time.Minute),
+
+		DoppelGangerURLs:    doppelGangerURLs,
+		DoppelGangerPerRaid: conf.Defense.Doppelganger.Repeats.Get(mtglib.DoppelGangerPerRaid),
+		DoppelGangerEach:    conf.Defense.Doppelganger.UpdateEach.Get(mtglib.DoppelGangerEach),
+		DoppelGangerDRS:     conf.Defense.Doppelganger.DRS.Get(false),
 	}
 
 	proxy, err := mtglib.NewProxy(opts)
@@ -209,12 +281,20 @@ func runProxy(conf *config.Config, version string) error { // nolint: funlen
 		return fmt.Errorf("cannot start proxy: %w", err)
 	}
 
+	if conf.ProxyProtocolListener.Get(false) {
+		listener = &proxyprotocol.ListenerAdapter{
+			Listener: proxyproto.Listener{
+				Listener: listener,
+			},
+		}
+	}
+
 	ctx := utils.RootContext()
 
-	go proxy.Serve(listener) // nolint: errcheck
+	go proxy.Serve(listener) //nolint: errcheck
 
 	<-ctx.Done()
-	listener.Close()
+	listener.Close() //nolint: errcheck
 	proxy.Shutdown()
 
 	return nil

internal/cli/simple_run.go

@@ -13,17 +13,19 @@ type SimpleRun struct {
 	BindTo string `kong:"arg,required,name='bind-to',help='A host:port to bind proxy to.'"`
 	Secret string `kong:"arg,required,name='secret',help='Proxy secret.'"`
 
-	Debug               bool          `kong:"name='debug',short='d',help='Run in debug mode.'"`                                                                        // nolint: lll
-	Concurrency         uint64        `kong:"name='concurrency',short='c',default='8192',help='Max number of concurrent connection to proxy.'"`                        // nolint: lll
-	TCPBuffer           string        `kong:"name='tcp-buffer',short='b',default='4KB',help='Deprecated and ignored'"`                                                 // nolint: lll
-	PreferIP            string        `kong:"name='prefer-ip',short='i',default='prefer-ipv6',help='IP preference. By default we prefer IPv6 with fallback to IPv4.'"` // nolint: lll
-	DomainFrontingPort  uint64        `kong:"name='domain-fronting-port',short='p',default='443',help='A port to access for domain fronting.'"`                        // nolint: lll
-	DOHIP               net.IP        `kong:"name='doh-ip',short='n',default='9.9.9.9',help='IP address of DNS-over-HTTP to use.'"`                                    // nolint: lll
-	Timeout             time.Duration `kong:"name='timeout',short='t',default='10s',help='Network timeout to use'"`                                                    // nolint: lll
-	AntiReplayCacheSize string        `kong:"name='antireplay-cache-size',short='a',default='1MB',help='A size of anti-replay cache to use.'"`                         // nolint: lll
+	Debug               bool          `kong:"name='debug',short='d',help='Run in debug mode.'"`                                                                        //nolint: lll
+	Concurrency         uint64        `kong:"name='concurrency',short='c',default='8192',help='Max number of concurrent connection to proxy.'"`                        //nolint: lll
+	TCPBuffer           string        `kong:"name='tcp-buffer',short='b',default='4KB',help='Deprecated and ignored'"`                                                 //nolint: lll
+	PreferIP            string        `kong:"name='prefer-ip',short='i',default='prefer-ipv6',help='IP preference. By default we prefer IPv6 with fallback to IPv4.'"` //nolint: lll
+	DomainFrontingPort  uint64        `kong:"name='domain-fronting-port',short='p',default='443',help='A port to access for domain fronting.'"`                        //nolint: lll
+	DomainFrontingIP    string        `kong:"name='domain-fronting-ip',help='An IP address to use for domain fronting instead of resolving the hostname via DNS.'"`    //nolint: lll
+	DOHIP               net.IP        `kong:"name='doh-ip',short='n',default='1.1.1.1',help='IP address of DNS-over-HTTP to use.'"`                                    //nolint: lll
+	Timeout             time.Duration `kong:"name='timeout',short='t',default='10s',help='Network timeout to use'"`                                                    //nolint: lll
+	Socks5Proxies       []string      `kong:"name='socks5-proxy',short='s',help='Socks5 proxies to use for network access.'"`                                          //nolint: lll
+	AntiReplayCacheSize string        `kong:"name='antireplay-cache-size',short='a',default='1MB',help='A size of anti-replay cache to use.'"`                         //nolint: lll
 }
 
-func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
+func (s *SimpleRun) Run(cli *CLI, version string) error { //nolint: cyclop,funlen
 	conf := &config.Config{}
 
 	if err := conf.BindTo.Set(s.BindTo); err != nil {
@@ -34,7 +36,7 @@ func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
 		return fmt.Errorf("incorrect secret: %w", err)
 	}
 
-	if err := conf.Concurrency.Set(strconv.FormatUint(s.Concurrency, 10)); err != nil { // nolint: gomnd
+	if err := conf.Concurrency.Set(strconv.FormatUint(s.Concurrency, 10)); err != nil {
 		return fmt.Errorf("incorrect concurrency: %w", err)
 	}
 
@@ -42,10 +44,16 @@ func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
 		return fmt.Errorf("incorrect prefer-ip: %w", err)
 	}
 
-	if err := conf.DomainFrontingPort.Set(strconv.FormatUint(s.DomainFrontingPort, 10)); err != nil { // nolint: gomnd
+	if err := conf.DomainFrontingPort.Set(strconv.FormatUint(s.DomainFrontingPort, 10)); err != nil {
 		return fmt.Errorf("incorrect domain-fronting-port: %w", err)
 	}
 
+	if s.DomainFrontingIP != "" {
+		if err := conf.DomainFrontingIP.Set(s.DomainFrontingIP); err != nil {
+			return fmt.Errorf("incorrect domain-fronting-ip: %w", err)
+		}
+	}
+
 	if err := conf.Network.DOHIP.Set(s.DOHIP.String()); err != nil {
 		return fmt.Errorf("incorrect doh-ip: %w", err)
 	}
@@ -66,6 +74,16 @@ func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
 		return fmt.Errorf("incorrect antireplay-cache-size: %w", err)
 	}
 
+	for _, v := range s.Socks5Proxies {
+		proxyURL := config.TypeProxyURL{}
+
+		if err := proxyURL.Set(v); err != nil {
+			return fmt.Errorf("incorrect socks5 proxy URL: %w", err)
+		}
+
+		conf.Network.Proxies = append(conf.Network.Proxies, proxyURL)
+	}
+
 	conf.Debug.Value = s.Debug
 	conf.AllowFallbackOnUnknownDC.Value = true
 	conf.Defense.AntiReplay.Enabled.Value = true

internal/cli/utils.go

@@ -0,0 +1,51 @@
+package cli
+
+import (
+	"context"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/9seconds/mtg/v2/essentials"
+	"github.com/9seconds/mtg/v2/mtglib"
+)
+
+func getIP(ntw mtglib.Network, protocol string) net.IP {
+	dialer := ntw.NativeDialer()
+	client := ntw.MakeHTTPClient(func(ctx context.Context, network, address string) (essentials.Conn, error) {
+		conn, err := dialer.DialContext(ctx, protocol, address)
+		if err != nil {
+			return nil, err
+		}
+		return essentials.WrapNetConn(conn), err
+	})
+
+	req, err := http.NewRequest(http.MethodGet, "https://ifconfig.co", nil) //nolint: noctx
+	if err != nil {
+		panic(err)
+	}
+
+	req.Header.Add("Accept", "text/plain")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil
+	}
+
+	defer func() {
+		io.Copy(io.Discard, resp.Body) //nolint: errcheck
+		resp.Body.Close()              //nolint: errcheck
+	}()
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil
+	}
+
+	return net.ParseIP(strings.TrimSpace(string(data)))
+}

internal/config/config.go

@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"net"
+	"net/url"
 
 	"github.com/9seconds/mtg/v2/mtglib"
 )
@@ -21,23 +23,40 @@ type ListConfig struct {
 }
 
 type Config struct {
-	Debug                    TypeBool        `json:"debug"`
-	AllowFallbackOnUnknownDC TypeBool        `json:"allowFallbackOnUnknownDc"`
-	Secret                   mtglib.Secret   `json:"secret"`
-	BindTo                   TypeHostPort    `json:"bindTo"`
-	PreferIP                 TypePreferIP    `json:"preferIp"`
-	DomainFrontingPort       TypePort        `json:"domainFrontingPort"`
-	TolerateTimeSkewness     TypeDuration    `json:"tolerateTimeSkewness"`
-	Concurrency              TypeConcurrency `json:"concurrency"`
-	Defense                  struct {
+	Debug                       TypeBool        `json:"debug"`
+	AllowFallbackOnUnknownDC    TypeBool        `json:"allowFallbackOnUnknownDc"`
+	Secret                      mtglib.Secret   `json:"secret"`
+	BindTo                      TypeHostPort    `json:"bindTo"`
+	ProxyProtocolListener       TypeBool        `json:"proxyProtocolListener"`
+	PreferIP                    TypePreferIP    `json:"preferIp"`
+	AutoUpdate                  TypeBool        `json:"autoUpdate"`
+	DomainFrontingPort          TypePort        `json:"domainFrontingPort"`
+	DomainFrontingIP            TypeIP          `json:"domainFrontingIp"`
+	DomainFrontingProxyProtocol TypeBool        `json:"domainFrontingProxyProtocol"`
+	TolerateTimeSkewness        TypeDuration    `json:"tolerateTimeSkewness"`
+	Concurrency                 TypeConcurrency `json:"concurrency"`
+	PublicIPv4                  TypeIP          `json:"publicIpv4"`
+	PublicIPv6                  TypeIP          `json:"publicIpv6"`
+	DomainFronting              struct {
+		IP            TypeIP   `json:"ip"`
+		Port          TypePort `json:"port"`
+		ProxyProtocol TypeBool `json:"proxyProtocol"`
+	} `json:"domainFronting"`
+	Defense struct {
 		AntiReplay struct {
 			Optional
 
 			MaxSize   TypeBytes     `json:"maxSize"`
 			ErrorRate TypeErrorRate `json:"errorRate"`
 		} `json:"antiReplay"`
-		Blocklist ListConfig `json:"blocklist"`
-		Allowlist ListConfig `json:"allowlist"`
+		Blocklist    ListConfig `json:"blocklist"`
+		Allowlist    ListConfig `json:"allowlist"`
+		Doppelganger struct {
+			URLs            []TypeHttpsURL  `json:"urls"`
+			Repeats         TypeConcurrency `json:"repeats_per_raid"`
+			UpdateEach      TypeDuration    `json:"raid_each"`
+			DRS             TypeBool        `json:"drs"`
+		} `json:"doppelganger"`
 	} `json:"defense"`
 	Network struct {
 		Timeout struct {
@@ -46,6 +65,7 @@ type Config struct {
 			Idle TypeDuration `json:"idle"`
 		} `json:"timeout"`
 		DOHIP   TypeIP         `json:"dohIp"`
+		DNS     TypeDNSURI     `json:"dns"`
 		Proxies []TypeProxyURL `json:"proxies"`
 	} `json:"network"`
 	Stats struct {
@@ -66,6 +86,44 @@ type Config struct {
 	} `json:"stats"`
 }
 
+func (c *Config) GetConcurrency(defaultValue uint) uint {
+	if concurrency := c.Concurrency.Get(0); concurrency != 0 {
+		return concurrency
+	}
+	return c.Concurrency.Get(defaultValue)
+}
+
+func (c *Config) GetDNS() *url.URL {
+	var dohURL *url.URL
+
+	if dohIP := c.Network.DOHIP.Get(nil); dohIP != nil {
+		dohURL, _ = url.Parse("https://" + dohIP.String())
+	}
+
+	return c.Network.DNS.Get(dohURL)
+}
+
+func (c *Config) GetDomainFrontingPort(defaultValue uint) uint {
+	if port := c.DomainFronting.Port.Get(0); port != 0 {
+		return port
+	}
+	return c.DomainFrontingPort.Get(defaultValue)
+}
+
+func (c *Config) GetDomainFrontingIP(defaultValue net.IP) string {
+	if ip := c.DomainFronting.IP.Get(nil); ip != nil {
+		return ip.String()
+	}
+	if ip := c.DomainFrontingIP.Get(defaultValue); ip != nil {
+		return ip.String()
+	}
+	return ""
+}
+
+func (c *Config) GetDomainFrontingProxyProtocol(defaultValue bool) bool {
+	return c.DomainFronting.ProxyProtocol.Get(false) || c.DomainFrontingProxyProtocol.Get(defaultValue)
+}
+
 func (c *Config) Validate() error {
 	if !c.Secret.Valid() {
 		return fmt.Errorf("invalid secret %s", c.Secret.String())

internal/config/config_test.go

@@ -42,6 +42,32 @@ func (suite *ConfigTestSuite) TestParseMinimalConfig() {
 	suite.Equal("0.0.0.0:3128", conf.BindTo.String())
 }
 
+func (suite *ConfigTestSuite) TestParsePublicIP() {
+	conf, err := config.Parse(suite.ReadConfig("public_ip.toml"))
+	suite.NoError(err)
+	suite.Equal("203.0.113.1", conf.PublicIPv4.Get(nil).String())
+	suite.Equal("2001:db8::1", conf.PublicIPv6.Get(nil).String())
+}
+
+func (suite *ConfigTestSuite) TestParsePublicIPv4Only() {
+	conf, err := config.Parse(suite.ReadConfig("public_ip_v4_only.toml"))
+	suite.NoError(err)
+	suite.Equal("203.0.113.1", conf.PublicIPv4.Get(nil).String())
+	suite.Nil(conf.PublicIPv6.Get(nil))
+}
+
+func (suite *ConfigTestSuite) TestParsePublicIPInvalid() {
+	_, err := config.Parse(suite.ReadConfig("public_ip_invalid.toml"))
+	suite.Error(err)
+}
+
+func (suite *ConfigTestSuite) TestParsePublicIPNotSet() {
+	conf, err := config.Parse(suite.ReadConfig("minimal.toml"))
+	suite.NoError(err)
+	suite.Nil(conf.PublicIPv4.Get(nil))
+	suite.Nil(conf.PublicIPv6.Get(nil))
+}
+
 func (suite *ConfigTestSuite) TestString() {
 	conf, err := config.Parse(suite.ReadConfig("minimal.toml"))
 	suite.NoError(err)

internal/config/parse.go

@@ -5,19 +5,30 @@ import (
 	"encoding/json"
 	"fmt"
 
-	"github.com/pelletier/go-toml"
+	"github.com/pelletier/go-toml/v2"
 )
 
 type tomlConfig struct {
-	Debug                    bool   `toml:"debug" json:"debug,omitempty"`
-	AllowFallbackOnUnknownDC bool   `toml:"allow-fallback-on-unknown-dc" json:"allowFallbackOnUnknownDc,omitempty"`
-	Secret                   string `toml:"secret" json:"secret"`
-	BindTo                   string `toml:"bind-to" json:"bindTo"`
-	PreferIP                 string `toml:"prefer-ip" json:"preferIp,omitempty"`
-	DomainFrontingPort       uint   `toml:"domain-fronting-port" json:"domainFrontingPort,omitempty"`
-	TolerateTimeSkewness     string `toml:"tolerate-time-skewness" json:"tolerateTimeSkewness,omitempty"`
-	Concurrency              uint   `toml:"concurrency" json:"concurrency,omitempty"`
-	Defense                  struct {
+	Debug                       bool   `toml:"debug" json:"debug,omitempty"`
+	AllowFallbackOnUnknownDC    bool   `toml:"allow-fallback-on-unknown-dc" json:"allowFallbackOnUnknownDc,omitempty"`
+	Secret                      string `toml:"secret" json:"secret"`
+	BindTo                      string `toml:"bind-to" json:"bindTo"`
+	ProxyProtocolListener       bool   `toml:"proxy-protocol-listener" json:"proxyProtocolListener"`
+	PreferIP                    string `toml:"prefer-ip" json:"preferIp,omitempty"`
+	AutoUpdate                  bool   `toml:"auto-update" json:"autoUpdate,omitempty"`
+	DomainFrontingPort          uint   `toml:"domain-fronting-port" json:"domainFrontingPort,omitempty"`
+	DomainFrontingIP            string `toml:"domain-fronting-ip" json:"domainFrontingIp,omitempty"`
+	DomainFrontingProxyProtocol bool   `toml:"domain-fronting-proxy-protocol" json:"domainFrontingProxyProtocol,omitempty"`
+	TolerateTimeSkewness        string `toml:"tolerate-time-skewness" json:"tolerateTimeSkewness,omitempty"`
+	Concurrency                 uint   `toml:"concurrency" json:"concurrency,omitempty"`
+	PublicIPv4                  string `toml:"public-ipv4" json:"publicIpv4,omitempty"`
+	PublicIPv6                  string `toml:"public-ipv6" json:"publicIpv6,omitempty"`
+	DomainFronting              struct {
+		IP            string `toml:"ip" json:"ip,omitempty"`
+		Port          uint   `toml:"port" json:"port,omitempty"`
+		ProxyProtocol bool   `toml:"proxy-protocol" json:"proxyProtocol,omitempty"`
+	} `toml:"domain-fronting" json:"domainFronting,omitempty"`
+	Defense struct {
 		AntiReplay struct {
 			Enabled   bool    `toml:"enabled" json:"enabled,omitempty"`
 			MaxSize   string  `toml:"max-size" json:"maxSize,omitempty"`
@@ -35,6 +46,12 @@ type tomlConfig struct {
 			URLs                []string `toml:"urls" json:"urls,omitempty"`
 			UpdateEach          string   `toml:"update-each" json:"updateEach,omitempty"`
 		} `toml:"allowlist" json:"allowlist,omitempty"`
+		Doppelganger struct {
+			URLs            []string `toml:"urls" json:"urls,omitempty"`
+			Repeats         uint     `toml:"repeats-per-raid" json:"repeats_per_raid,omitempty"`
+			UpdateEach      string   `toml:"raid-each" json:"raid_each,omitempty"`
+			DRS             bool     `toml:"drs" json:"drs,omitempty"`
+		} `toml:"doppelganger" json:"doppelganger,omitempty"`
 	} `toml:"defense" json:"defense,omitempty"`
 	Network struct {
 		Timeout struct {
@@ -43,6 +60,7 @@ type tomlConfig struct {
 			Idle string `toml:"idle" json:"idle,omitempty"`
 		} `toml:"timeout" json:"timeout,omitempty"`
 		DOHIP   string   `toml:"doh-ip" json:"dohIp,omitempty"`
+		DNS     string   `toml:"dns" json:"dns,omitempty"`
 		Proxies []string `toml:"proxies" json:"proxies,omitempty"`
 	} `toml:"network" json:"network,omitempty"`
 	Stats struct {

internal/config/testdata/public_ip.toml

@@ -0,0 +1,4 @@
+secret = "7oe1GqLy6TBc38CV3jx7q09nb29nbGUuY29t"
+bind-to = "0.0.0.0:3128"
+public-ipv4 = "203.0.113.1"
+public-ipv6 = "2001:db8::1"

internal/config/testdata/public_ip_invalid.toml

@@ -0,0 +1,3 @@
+secret = "7oe1GqLy6TBc38CV3jx7q09nb29nbGUuY29t"
+bind-to = "0.0.0.0:3128"
+public-ipv4 = "not-an-ip"

internal/config/testdata/public_ip_v4_only.toml

@@ -0,0 +1,3 @@
+secret = "7oe1GqLy6TBc38CV3jx7q09nb29nbGUuY29t"
+bind-to = "0.0.0.0:3128"
+public-ipv4 = "203.0.113.1"

internal/config/type_bool_test.go

@@ -20,7 +20,7 @@ type TypeBoolTestSuite struct {
 }
 
 func (suite *TypeBoolTestSuite) TestUnmarshalFail() {
-	testData := []interface{}{
+	testData := []any{
 		"",
 		"np",
 		"нет",
@@ -29,7 +29,7 @@ func (suite *TypeBoolTestSuite) TestUnmarshalFail() {
 	}
 
 	for _, v := range testData {
-		data, err := json.Marshal(map[string]interface{}{
+		data, err := json.Marshal(map[string]any{
 			"value": v,
 		})
 		suite.NoError(err)

internal/config/type_concurrency.go

@@ -10,7 +10,7 @@ type TypeConcurrency struct {
 }
 
 func (t *TypeConcurrency) Set(value string) error {
-	concurrencyValue, err := strconv.ParseUint(value, 10, 16) // nolint: gomnd
+	concurrencyValue, err := strconv.ParseUint(value, 10, 16)
 	if err != nil {
 		return fmt.Errorf("value is not uint (%s): %w", value, err)
 	}
@@ -41,5 +41,5 @@ func (t TypeConcurrency) MarshalJSON() ([]byte, error) {
 }
 
 func (t TypeConcurrency) String() string {
-	return strconv.FormatUint(uint64(t.Value), 10) // nolint: gomnd
+	return strconv.FormatUint(uint64(t.Value), 10)
 }

internal/config/type_dc.go

@@ -0,0 +1,41 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type TypeDC struct {
+	Value int
+}
+
+func (t *TypeDC) Set(value string) error {
+	parsed, err := strconv.ParseInt(value, 10, 16)
+	if err != nil {
+		return fmt.Errorf("cannot parse dc: %w", err)
+	}
+
+	if parsed < 0 {
+		parsed = -parsed
+	}
+
+	t.Value = int(parsed)
+
+	return nil
+}
+
+func (t *TypeDC) UnmarshalJSON(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeDC) MarshalJSON() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeDC) String() string {
+	return strconv.Itoa(t.Value)
+}
+
+func (t TypeDC) Get() int {
+	return t.Value
+}

internal/config/type_dc_test.go

@@ -0,0 +1,96 @@
+package config_test
+
+import (
+	"encoding/json"
+	"strconv"
+	"testing"
+
+	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+)
+
+type typeDCTestStruct struct {
+	Value config.TypeDC `json:"value"`
+}
+
+type TypeDCTestSuite struct {
+	suite.Suite
+}
+
+func (suite *TypeDCTestSuite) TestUnmarshalFail() {
+	testData := []string{
+		"-1s",
+		"1202002020202",
+		"xxx",
+		"-11111111111111",
+		"",
+	}
+
+	for _, v := range testData {
+		data, err := json.Marshal(map[string]string{
+			"value": v,
+		})
+		suite.NoError(err)
+
+		suite.T().Run(v, func(t *testing.T) {
+			assert.Error(t, json.Unmarshal(data, &typeDCTestStruct{}))
+		})
+	}
+}
+
+func (suite *TypeDCTestSuite) TestUnmarshalOk() {
+	testData := map[int]int{
+		1:   1,
+		-1:  1,
+		203: 203,
+	}
+
+	for value, expected := range testData {
+		data, err := json.Marshal(map[string]int{
+			"value": value,
+		})
+		suite.NoError(err)
+
+		suite.T().Run(strconv.Itoa(value), func(t *testing.T) {
+			testStruct := &typeDCTestStruct{}
+
+			assert.NoError(t, json.Unmarshal(data, testStruct))
+			assert.Equal(t, expected, testStruct.Value.Value)
+			assert.Equal(t, expected, testStruct.Value.Get())
+		})
+	}
+}
+
+func (suite *TypeDCTestSuite) TestMarshalOk() {
+	testData := map[string]int{
+		"1":   1,
+		"203": 203,
+	}
+
+	for k, v := range testData {
+		value := k
+		expected := v
+
+		suite.T().Run(value, func(t *testing.T) {
+			testStruct := &typeDCTestStruct{}
+
+			assert.NoError(t, testStruct.Value.Set(value))
+
+			data, err := json.Marshal(testStruct)
+			assert.NoError(t, err)
+
+			expectedJSON, err := json.Marshal(map[string]int{
+				"value": expected,
+			})
+			assert.NoError(t, err)
+
+			assert.JSONEq(t, string(expectedJSON), string(data))
+		})
+	}
+}
+
+func TestTypeDC(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &TypeDCTestSuite{})
+}

internal/config/type_dns_uri.go

@@ -0,0 +1,69 @@
+package config
+
+import (
+	"fmt"
+	"net"
+	"net/url"
+)
+
+type TypeDNSURI struct {
+	Value *url.URL
+}
+
+func (t *TypeDNSURI) Set(value string) error {
+	parsed, err := url.Parse(value)
+	if err != nil {
+		return fmt.Errorf("value is not URI: %w", err)
+	}
+
+	if parsed.Host == "" {
+		parsed.Host = parsed.Path
+		parsed.Path = ""
+		parsed.Scheme = "udp"
+	}
+
+	switch parsed.Scheme {
+	case "https", "tls":
+	case "udp":
+		if ip := net.ParseIP(parsed.Hostname()); ip == nil {
+			return fmt.Errorf("simple DNS must IP address: %s", parsed.Hostname())
+		}
+	default:
+		return fmt.Errorf("unsupported DNS type %s", parsed.Scheme)
+	}
+
+	if parsed.Scheme != "https" && parsed.Path != "" {
+		return fmt.Errorf("path is supported only for DoH: %s", parsed)
+	}
+
+	if parsed.User != nil {
+		return fmt.Errorf("used info is not supported: %s", parsed.User.String())
+	}
+
+	t.Value = parsed
+
+	return nil
+}
+
+func (t *TypeDNSURI) Get(defaultValue *url.URL) *url.URL {
+	if t.Value != nil {
+		return t.Value
+	}
+
+	return defaultValue
+}
+
+func (t *TypeDNSURI) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeDNSURI) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeDNSURI) String() string {
+	if t.Value == nil {
+		return ""
+	}
+	return t.Value.String()
+}

internal/config/type_dns_uri_test.go

@@ -0,0 +1,117 @@
+package config_test
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+)
+
+type typeDNSURITestStruct struct {
+	Value config.TypeDNSURI `json:"value"`
+}
+
+type TypeDNSURITestSuite struct {
+	suite.Suite
+}
+
+func (suite *TypeDNSURITestSuite) TestUnmarshalFail() {
+	testData := []string{
+		"xx",
+		"ppar",
+		"",
+		"dns://hahaha",
+		"udp://xcxxcv",
+		"udp://1.1.1.1/xcv",
+		"1.1.1.1/xxx",
+		"tls://dns/xx",
+		"tls://1.1.1.1/xx",
+		"https://user:password@1.1.1.1",
+		"tls://user:password@1.1.1.1",
+		"udp://user:password@1.1.1.1",
+	}
+
+	for _, v := range testData {
+		data, err := json.Marshal(map[string]string{
+			"value": v,
+		})
+		suite.NoError(err)
+
+		suite.T().Run(v, func(t *testing.T) {
+			assert.Error(t, json.Unmarshal(data, &typeDNSURITestStruct{}))
+		})
+	}
+}
+
+func (suite *TypeDNSURITestSuite) TestUnmarshalOk() {
+	testData := []string{
+		"1.1.1.1",
+		"tls://1.1.1.1",
+		"tls://dns.google",
+		"https://1.1.1.1",
+		"https://1.1.1.1/dns-query",
+		"https://dns.google",
+		"https://dns.google/dns-query",
+		"udp://1.1.1.1",
+	}
+
+	for _, v := range testData {
+		data, err := json.Marshal(map[string]string{
+			"value": v,
+		})
+		suite.NoError(err)
+
+		suite.T().Run(v, func(t *testing.T) {
+			testStruct := &typeDNSURITestStruct{}
+			assert.NoError(t, json.Unmarshal(data, testStruct))
+			if v == "1.1.1.1" {
+				v = "udp://" + v
+			}
+			assert.Equal(t, v, testStruct.Value.String())
+		})
+	}
+}
+
+func (suite *TypeDNSURITestSuite) TestMarshalOk() {
+	testData := []string{
+		"tls://1.1.1.1",
+		"tls://dns.google",
+		"https://1.1.1.1",
+		"https://1.1.1.1/dns-query",
+	}
+
+	for _, v := range testData {
+		suite.T().Run(v, func(t *testing.T) {
+			testStruct := &typePreferIPTestStruct{
+				Value: config.TypePreferIP{
+					Value: v,
+				},
+			}
+
+			encodedJSON, err := json.Marshal(testStruct)
+			assert.NoError(t, err)
+
+			expectedJSON, err := json.Marshal(map[string]string{
+				"value": v,
+			})
+			assert.NoError(t, err)
+
+			assert.JSONEq(t, string(expectedJSON), string(encodedJSON))
+		})
+	}
+}
+
+func (suite *TypeDNSURITestSuite) TestGet() {
+	value := config.TypeDNSURI{}
+	suite.Nil(value.Get(nil))
+
+	suite.NoError(value.Set("tls://1.1.1.1"))
+	suite.NotNil(value.Get(nil))
+}
+
+func TestDNSURI(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &TypeDNSURITestSuite{})
+}

internal/config/type_error_rate.go

@@ -12,7 +12,7 @@ type TypeErrorRate struct {
 }
 
 func (t *TypeErrorRate) Set(value string) error {
-	parsedValue, err := strconv.ParseFloat(value, 64) // nolint: gomnd
+	parsedValue, err := strconv.ParseFloat(value, 64)
 	if err != nil {
 		return fmt.Errorf("value is not a float (%s): %w", value, err)
 	}
@@ -43,5 +43,5 @@ func (t TypeErrorRate) MarshalJSON() ([]byte, error) {
 }
 
 func (t TypeErrorRate) String() string {
-	return strconv.FormatFloat(t.Value, 'f', -1, 64) // nolint: gomnd
+	return strconv.FormatFloat(t.Value, 'f', -1, 64)
 }

internal/config/type_hostport.go

@@ -18,7 +18,7 @@ func (t *TypeHostPort) Set(value string) error {
 		return fmt.Errorf("incorrect host:port value (%v): %w", value, err)
 	}
 
-	portValue, err := strconv.ParseUint(port, 10, 16) // nolint: gomnd
+	portValue, err := strconv.ParseUint(port, 10, 16)
 	if err != nil {
 		return fmt.Errorf("incorrect port number (%v): %w", value, err)
 	}

internal/config/type_https_url.go

@@ -0,0 +1,53 @@
+package config
+
+import (
+	"fmt"
+	"net/url"
+)
+
+type TypeHttpsURL struct {
+	Value *url.URL
+}
+
+func (t *TypeHttpsURL) Set(value string) error {
+	parsedURL, err := url.Parse(value)
+	if err != nil {
+		return fmt.Errorf("value is not correct URL (%s): %w", value, err)
+	}
+
+	if parsedURL.Host == "" {
+		return fmt.Errorf("url has to have a schema: %s", value)
+	}
+
+	if parsedURL.Scheme != "https" {
+		return fmt.Errorf("unsupported schema: %s", parsedURL.Scheme)
+	}
+
+	t.Value = parsedURL
+
+	return nil
+}
+
+func (t *TypeHttpsURL) Get(defaultValue *url.URL) *url.URL {
+	if t.Value == nil {
+		return defaultValue
+	}
+
+	return t.Value
+}
+
+func (t *TypeHttpsURL) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeHttpsURL) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeHttpsURL) String() string {
+	if t.Value == nil {
+		return ""
+	}
+
+	return t.Value.String()
+}

internal/config/type_https_url_test.go

@@ -0,0 +1,100 @@
+package config_test
+
+import (
+	"encoding/json"
+	"net/url"
+	"testing"
+
+	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+)
+
+type typeHttpsURLTestStruct struct {
+	Value config.TypeHttpsURL `json:"value"`
+}
+
+type HttpsURLTestSuite struct {
+	suite.Suite
+}
+
+func (suite *HttpsURLTestSuite) TestUnmarshalFail() {
+	testData := []string{
+		"",
+		"https://",
+		"://lala",
+		"/path",
+		"http://example.com",
+		"socks5://example.com",
+	}
+
+	for _, v := range testData {
+		data, err := json.Marshal(map[string]string{
+			"value": v,
+		})
+		suite.NoError(err)
+
+		suite.T().Run(v, func(t *testing.T) {
+			assert.Error(t, json.Unmarshal(data, &typeHttpsURLTestStruct{}))
+		})
+	}
+}
+
+func (suite *HttpsURLTestSuite) TestUnmarshalOk() {
+	testData := map[string]string{
+		"https://example.com":           "https://example.com",
+		"https://example.com:8443":      "https://example.com:8443",
+		"https://example.com/path?q=1":  "https://example.com/path?q=1",
+		"https://user:pass@example.com": "https://user:pass@example.com",
+	}
+
+	for k, v := range testData {
+		value := v
+
+		data, err := json.Marshal(map[string]string{
+			"value": k,
+		})
+		suite.NoError(err)
+
+		suite.T().Run(k, func(t *testing.T) {
+			testStruct := &typeHttpsURLTestStruct{}
+			assert.NoError(t, json.Unmarshal(data, testStruct))
+
+			parsed, _ := url.Parse(value)
+
+			assert.Equal(t, parsed.Scheme, testStruct.Value.Get(nil).Scheme)
+			assert.Equal(t, parsed.Host, testStruct.Value.Get(nil).Host)
+			assert.Equal(t, parsed.RawQuery, testStruct.Value.Get(nil).RawQuery)
+			assert.Equal(t, parsed.Path, testStruct.Value.Get(nil).Path)
+		})
+	}
+}
+
+func (suite *HttpsURLTestSuite) TestMarshalOk() {
+	parsed, _ := url.Parse("https://example.com/path?q=1")
+	testStruct := &typeHttpsURLTestStruct{
+		Value: config.TypeHttpsURL{
+			Value: parsed,
+		},
+	}
+
+	encodedJSON, err := json.Marshal(testStruct)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": "https://example.com/path?q=1"}`,
+		string(encodedJSON))
+}
+
+func (suite *HttpsURLTestSuite) TestGet() {
+	emptyURL := &url.URL{}
+
+	value := config.TypeHttpsURL{}
+	suite.Equal(emptyURL, value.Get(emptyURL))
+
+	value.Value = &url.URL{}
+	suite.Equal(value.Value, value.Get(emptyURL))
+}
+
+func TestTypeHttpsURL(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &HttpsURLTestSuite{})
+}

internal/config/type_port.go

@@ -10,7 +10,7 @@ type TypePort struct {
 }
 
 func (t *TypePort) Set(value string) error {
-	portValue, err := strconv.ParseUint(value, 10, 16) // nolint: gomnd
+	portValue, err := strconv.ParseUint(value, 10, 16)
 	if err != nil {
 		return fmt.Errorf("incorrect port number (%v): %w", value, err)
 	}

internal/config/type_proxy_url.go

@@ -15,20 +15,24 @@ type TypeProxyURL struct {
 func (t *TypeProxyURL) Set(value string) error {
 	parsedURL, err := url.Parse(value)
 	if err != nil {
-		return fmt.Errorf("value is not corect URL (%s): %w", value, err)
+		return fmt.Errorf("value is not correct URL (%s): %w", value, err)
 	}
 
 	if parsedURL.Host == "" {
 		return fmt.Errorf("url has to have a schema: %s", value)
 	}
 
-	if parsedURL.Scheme != "socks5" {
+	switch parsedURL.Scheme {
+	case "socks5", "socks5h":
+	default:
 		return fmt.Errorf("unsupported schema: %s", parsedURL.Scheme)
 	}
 
 	if _, _, err := net.SplitHostPort(parsedURL.Host); err != nil {
-		parsedURL.Host = net.JoinHostPort(parsedURL.Host,
-			typeProxyURLDefaultSOCKS5Port)
+		parsedURL.Host = net.JoinHostPort(
+			parsedURL.Host,
+			typeProxyURLDefaultSOCKS5Port,
+		)
 	}
 
 	t.Value = parsedURL

internal/proxyprotocol/adapter.go

@@ -0,0 +1,20 @@
+package proxyprotocol
+
+import (
+	"net"
+
+	"github.com/pires/go-proxyproto"
+)
+
+type ListenerAdapter struct {
+	proxyproto.Listener
+}
+
+func (l *ListenerAdapter) Accept() (net.Conn, error) {
+	conn, err := l.Listener.Accept()
+	if err != nil {
+		return nil, err
+	}
+
+	return connWrapper{conn.(*proxyproto.Conn)}, nil
+}

internal/proxyprotocol/conn.go

@@ -0,0 +1,25 @@
+package proxyprotocol
+
+import "github.com/pires/go-proxyproto"
+
+type connWrapper struct {
+	*proxyproto.Conn
+}
+
+func (c connWrapper) CloseRead() error {
+	tcpConn, ok := c.TCPConn()
+	if !ok {
+		panic("we support only tcp connections")
+	}
+
+	return tcpConn.CloseRead()
+}
+
+func (c connWrapper) CloseWrite() error {
+	tcpConn, ok := c.TCPConn()
+	if !ok {
+		panic("we support only tcp connections")
+	}
+
+	return tcpConn.CloseWrite()
+}

internal/testlib/capture_output.go

@@ -27,7 +27,7 @@ func captureOutput(filefp **os.File, callback func()) string {
 	closeChan := make(chan bool)
 
 	go func() {
-		io.Copy(buf, reader) // nolint: errcheck
+		io.Copy(buf, reader) //nolint: errcheck
 		close(closeChan)
 	}()
 
@@ -35,7 +35,7 @@ func captureOutput(filefp **os.File, callback func()) string {
 
 	callback()
 
-	writer.Close()
+	writer.Close() //nolint: errcheck
 	<-closeChan
 
 	return strings.TrimSpace(buf.String())

internal/testlib/mtglib_network_mock.go

@@ -2,6 +2,7 @@ package testlib
 
 import (
 	"context"
+	"net"
 	"net/http"
 
 	"github.com/9seconds/mtg/v2/essentials"
@@ -15,16 +16,21 @@ type MtglibNetworkMock struct {
 func (m *MtglibNetworkMock) Dial(network, address string) (essentials.Conn, error) {
 	args := m.Called(network, address)
 
-	return args.Get(0).(essentials.Conn), args.Error(1) // nolint: wrapcheck
+	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
 }
 
 func (m *MtglibNetworkMock) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
 	args := m.Called(ctx, network, address)
 
-	return args.Get(0).(essentials.Conn), args.Error(1) // nolint: wrapcheck
+	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
+}
+
+func (m *MtglibNetworkMock) NativeDialer() *net.Dialer {
+	return m.Called().Get(0).(*net.Dialer)
 }
 
 func (m *MtglibNetworkMock) MakeHTTPClient(dialFunc func(ctx context.Context,
-	network, address string) (essentials.Conn, error)) *http.Client {
-	return m.Called(dialFunc).Get(0).(*http.Client)
+	network, address string) (essentials.Conn, error),
+) *http.Client {
+	return m.Called(dialFunc).Get(0).(*http.Client) //nolint: forcetypeassert
 }

internal/testlib/net_conn_mock.go

@@ -24,33 +24,33 @@ func (n *EssentialsConnMock) Write(b []byte) (int, error) {
 }
 
 func (n *EssentialsConnMock) Close() error {
-	return n.Called().Error(0) // nolint: wrapcheck
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) CloseRead() error {
-	return n.Called().Error(0) // nolint: wrapcheck
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) CloseWrite() error {
-	return n.Called().Error(0) // nolint: wrapcheck
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) LocalAddr() net.Addr {
-	return n.Called().Get(0).(net.Addr)
+	return n.Called().Get(0).(net.Addr) //nolint: forcetypeassert
 }
 
 func (n *EssentialsConnMock) RemoteAddr() net.Addr {
-	return n.Called().Get(0).(net.Addr)
+	return n.Called().Get(0).(net.Addr) //nolint: forcetypeassert
 }
 
 func (n *EssentialsConnMock) SetDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+	return n.Called(t).Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) SetReadDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+	return n.Called(t).Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) SetWriteDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+	return n.Called(t).Error(0) //nolint: wrapcheck
 }

internal/utils/net_listener.go

@@ -14,11 +14,11 @@ type Listener struct {
 func (l Listener) Accept() (net.Conn, error) {
 	conn, err := l.Listener.Accept()
 	if err != nil {
-		return nil, err // nolint: wrapcheck
+		return nil, err //nolint: wrapcheck
 	}
 
 	if err := network.SetClientSocketOptions(conn, 0); err != nil {
-		conn.Close()
+		conn.Close() //nolint: errcheck
 
 		return nil, fmt.Errorf("cannot set TCP options: %w", err)
 	}

internal/utils/rlimit.go

@@ -1,25 +0,0 @@
-//go:build !windows
-// +build !windows
-
-package utils
-
-import (
-	"fmt"
-
-	"golang.org/x/sys/unix"
-)
-
-func SetLimits() error {
-	rLimit := unix.Rlimit{}
-	if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rLimit); err != nil {
-		return fmt.Errorf("cannot get rlimit: %w", err)
-	}
-
-	rLimit.Cur = rLimit.Max
-
-	if err := unix.Setrlimit(unix.RLIMIT_NOFILE, &rLimit); err != nil {
-		return fmt.Errorf("cannot set rlimit: %w", err)
-	}
-
-	return nil
-}

internal/utils/rlimit_windows.go

@@ -1,8 +0,0 @@
-//go:build windows
-// +build windows
-
-package utils
-
-func SetLimits() error {
-	return nil
-}

ipblocklist/files/doc.go

@@ -0,0 +1,8 @@
+// files defines a set of abstraction for 'files': an openable entities that
+// could be read after.
+//
+// This is not a file on a filesystem of your local machine, it also can
+// include "in memory" files or even remote ones, like HTTP endpoints. If you
+// make a GET request to HTTP endpoint, then a body is readable and you can
+// consider it as an openable file.
+package files

ipblocklist/files/http.go

@@ -22,8 +22,8 @@ func (h httpFile) Open(ctx context.Context) (io.ReadCloser, error) {
 	response, err := h.http.Do(request)
 	if err != nil {
 		if response != nil {
-			io.Copy(io.Discard, response.Body) // nolint: errcheck
-			response.Body.Close()
+			io.Copy(io.Discard, response.Body) //nolint: errcheck
+			response.Body.Close()              //nolint: errcheck
 		}
 
 		return nil, fmt.Errorf("cannot get url %s: %w", h.url, err)
@@ -40,6 +40,8 @@ func (h httpFile) String() string {
 	return h.url
 }
 
+// NewHTTP returns a file abstraction for HTTP/HTTPS endpoint. You also need to
+// provide a valid instance of [http.Client] to access it.
 func NewHTTP(client *http.Client, endpoint string) (File, error) {
 	if client == nil {
 		return nil, ErrBadHTTPClient

ipblocklist/files/http_test.go

@@ -22,7 +22,7 @@ type HTTPTestSuite struct {
 }
 
 func (suite *HTTPTestSuite) makeFile(path string) (files.File, error) {
-	return files.NewHTTP(suite.httpClient, suite.httpServer.URL+"/"+path) // nolint: wrapcheck
+	return files.NewHTTP(suite.httpClient, suite.httpServer.URL+"/"+path) //nolint: wrapcheck
 }
 
 func (suite *HTTPTestSuite) SetupSuite() {
@@ -77,7 +77,7 @@ func (suite *HTTPTestSuite) TestOk() {
 	readCloser, err := file.Open(suite.ctx)
 	suite.NoError(err)
 
-	defer readCloser.Close()
+	defer readCloser.Close() //nolint: errcheck
 
 	data, err := io.ReadAll(readCloser)
 	suite.NoError(err)

ipblocklist/files/init.go

@@ -6,9 +6,16 @@ import (
 	"io"
 )
 
+// ErrBadHTTPClient is returned if given HTTP client is initialized
+// incorrectly.
 var ErrBadHTTPClient = errors.New("incorrect http client")
 
+// File is an abstraction for a entity that can be opened in some context.
 type File interface {
+	// Open returns an readable entity for a file. It is important to not forget
+	// to close it after the usage.
 	Open(context.Context) (io.ReadCloser, error)
+
+	// String returns a short text description for the file
 	String() string
 }

ipblocklist/files/local.go

@@ -12,13 +12,14 @@ type localFile struct {
 }
 
 func (l localFile) Open(ctx context.Context) (io.ReadCloser, error) {
-	return os.Open(l.path) // nolint: wrapcheck
+	return os.Open(l.path) //nolint: wrapcheck
 }
 
 func (l localFile) String() string {
 	return l.path
 }
 
+// NewLocal returns an openable File for a path on a local file system.
 func NewLocal(path string) (File, error) {
 	if stat, err := os.Stat(path); os.IsNotExist(err) || stat.IsDir() || stat.Mode().Perm()&0o400 == 0 {
 		return nil, fmt.Errorf("%s is not a readable file", path)

ipblocklist/files/mem.go

@@ -0,0 +1,38 @@
+package files
+
+import (
+	"context"
+	"io"
+	"net"
+	"strings"
+)
+
+type memFile struct {
+	data string
+}
+
+func (m memFile) Open(ctx context.Context) (io.ReadCloser, error) {
+	return io.NopCloser(strings.NewReader(m.data)), nil
+}
+
+func (m memFile) String() string {
+	return "mem"
+}
+
+// NewMem returns an openable file that is kept in RAM.
+func NewMem(networks []*net.IPNet) File {
+	builder := strings.Builder{}
+
+	if len(networks) > 0 {
+		builder.WriteString(networks[0].String())
+	}
+
+	for i := 1; i < len(networks); i++ {
+		builder.WriteString("\n")
+		builder.WriteString(networks[i].String())
+	}
+
+	return memFile{
+		data: builder.String(),
+	}
+}

ipblocklist/files/mem_test.go

@@ -0,0 +1,42 @@
+package files_test
+
+import (
+	"context"
+	"io"
+	"net"
+	"strings"
+	"testing"
+
+	"github.com/9seconds/mtg/v2/ipblocklist/files"
+	"github.com/stretchr/testify/suite"
+)
+
+type MemTestSuite struct {
+	suite.Suite
+}
+
+func (suite *MemTestSuite) TestOk() {
+	_, network1, _ := net.ParseCIDR("192.168.0.1/24")
+	_, network2, _ := net.ParseCIDR("2001:0db8:85a3:0000:0000:8a2e:0370:7334/36")
+
+	file := files.NewMem([]*net.IPNet{
+		network1,
+		network2,
+	})
+
+	reader, err := file.Open(context.Background())
+	suite.NoError(err)
+
+	data, err := io.ReadAll(reader)
+	suite.NoError(err)
+
+	strData := strings.TrimSpace(string(data))
+
+	suite.Contains(strData, "192.168.0.0/24")
+	suite.Contains(strData, "2001:db8:8000::/36")
+}
+
+func TestMem(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &MemTestSuite{})
+}

ipblocklist/firehol.go

@@ -12,42 +12,46 @@ import (
 
 	"github.com/9seconds/mtg/v2/ipblocklist/files"
 	"github.com/9seconds/mtg/v2/mtglib"
-	"github.com/kentik/patricia"
-	"github.com/kentik/patricia/bool_tree"
 	"github.com/panjf2000/ants/v2"
+	"github.com/yl2chen/cidranger"
 )
 
-const (
-	fireholIPv4DefaultCIDR = 32
-	fireholIPv6DefaultCIDR = 128
+var (
+	fireholRegexpComment = regexp.MustCompile(`\s*#.*?$`)
+
+	fireholIPv4DefaultCIDR = net.CIDRMask(32, 32)
+	fireholIPv6DefaultCIDR = net.CIDRMask(128, 128)
 )
 
-var fireholRegexpComment = regexp.MustCompile(`\s*#.*?$`)
+// FireholUpdateCallback defines a signature of the callback that has to be
+// execute when ip list is updated.
+type FireholUpdateCallback func(context.Context, int)
 
-// Firehol is IPBlocklist which uses lists from FireHOL:
+// Firehol is [mtglib.IPBlocklist] which uses lists from FireHOL:
 // https://iplists.firehol.org/
 //
-// It can use both local files and remote URLs. This is not necessary
-// that blocklists should be taken from this website, we expect only
-// compatible formats here.
+// It can use both local files and remote URLs. This is not necessary that
+// blocklists should be taken from this website, we expect only compatible
+// formats here.
 //
 // Example of the format:
 //
-//     # this is a comment
-//     # to ignore
-//     127.0.0.1   # you can specify an IP
-//     10.0.0.0/8  # or cidr
+//	# this is a comment
+//	# to ignore
+//	127.0.0.1   # you can specify an IP
+//	10.0.0.0/8  # or cidr
 type Firehol struct {
 	ctx         context.Context
 	ctxCancel   context.CancelFunc
 	logger      mtglib.Logger
 	updateMutex sync.RWMutex
 
+	updateCallback FireholUpdateCallback
+	ranger         cidranger.Ranger
+
 	blocklists []files.File
 
 	workerPool *ants.Pool
-	treeV4     *bool_tree.TreeV4
-	treeV6     *bool_tree.TreeV6
 }
 
 // Shutdown stop a background update process.
@@ -64,17 +68,17 @@ func (f *Firehol) Contains(ip net.IP) bool {
 	f.updateMutex.RLock()
 	defer f.updateMutex.RUnlock()
 
-	if ip4 := ip.To4(); ip4 != nil {
-		return f.containsIPv4(ip4)
+	ok, err := f.ranger.Contains(ip)
+	if err != nil {
+		f.logger.BindStr("ip", ip.String()).DebugError("Cannot check if ip is present", err)
 	}
 
-	return f.containsIPv6(ip.To16())
+	return ok && err == nil
 }
 
 // Run starts a background update process.
 //
-// This is a blocking method so you probably want to run it in a
-// goroutine.
+// This is a blocking method so you probably want to run it in a goroutine.
 func (f *Firehol) Run(updateEach time.Duration) {
 	if updateEach == 0 {
 		updateEach = DefaultFireholUpdateEach
@@ -103,56 +107,32 @@ func (f *Firehol) Run(updateEach time.Duration) {
 	}
 }
 
-func (f *Firehol) containsIPv4(addr net.IP) bool {
-	ip := patricia.NewIPv4AddressFromBytes(addr, 32) // nolint: gomnd
-
-	if ok, _ := f.treeV4.FindDeepestTag(ip); ok {
-		return true
-	}
-
-	return false
-}
-
-func (f *Firehol) containsIPv6(addr net.IP) bool {
-	ip := patricia.NewIPv6Address(addr, 128) // nolint: gomnd
-
-	if ok, _ := f.treeV6.FindDeepestTag(ip); ok {
-		return true
-	}
-
-	return false
-}
-
 func (f *Firehol) update() {
 	ctx, cancel := context.WithCancel(f.ctx)
 	defer cancel()
 
 	wg := &sync.WaitGroup{}
-	wg.Add(len(f.blocklists))
 
-	treeMutex := &sync.Mutex{}
-	v4tree := bool_tree.NewTreeV4()
-	v6tree := bool_tree.NewTreeV6()
+	mutex := &sync.Mutex{}
+	ranger := cidranger.NewPCTrieRanger()
 
 	for _, v := range f.blocklists {
-		go func(file files.File) {
-			defer wg.Done()
+		wg.Go(func() {
+			logger := f.logger.BindStr("filename", v.String())
 
-			logger := f.logger.BindStr("filename", file.String())
-
-			fileContent, err := file.Open(ctx)
+			fileContent, err := v.Open(ctx)
 			if err != nil {
 				logger.WarningError("update has failed", err)
 
 				return
 			}
 
-			defer fileContent.Close()
+			defer fileContent.Close() //nolint: errcheck
 
-			if err := f.updateFromFile(treeMutex, v4tree, v6tree, bufio.NewScanner(fileContent)); err != nil {
+			if err := f.updateFromFile(mutex, ranger, bufio.NewScanner(fileContent)); err != nil {
 				logger.WarningError("update has failed", err)
 			}
-		}(v)
+		})
 	}
 
 	wg.Wait()
@@ -160,16 +140,19 @@ func (f *Firehol) update() {
 	f.updateMutex.Lock()
 	defer f.updateMutex.Unlock()
 
-	f.treeV4 = v4tree
-	f.treeV6 = v6tree
+	f.ranger = ranger
 
-	f.logger.Info("blocklist was updated")
+	if f.updateCallback != nil {
+		f.updateCallback(ctx, ranger.Len())
+	}
+
+	f.logger.Info("ip list was updated")
 }
 
 func (f *Firehol) updateFromFile(mutex sync.Locker,
-	v4tree *bool_tree.TreeV4,
-	v6tree *bool_tree.TreeV6,
-	scanner *bufio.Scanner) error {
+	ranger cidranger.Ranger,
+	scanner *bufio.Scanner,
+) error {
 	for scanner.Scan() {
 		text := scanner.Text()
 		text = fireholRegexpComment.ReplaceAllLiteralString(text, "")
@@ -179,12 +162,18 @@ func (f *Firehol) updateFromFile(mutex sync.Locker,
 			continue
 		}
 
-		ip, cidr, err := f.updateParseLine(text)
+		ipnet, err := f.updateParseLine(text)
 		if err != nil {
 			return fmt.Errorf("cannot parse a line: %w", err)
 		}
 
-		f.updateAddToTrees(ip, cidr, mutex, v4tree, v6tree)
+		mutex.Lock()
+		err = ranger.Insert(cidranger.NewBasicRangerEntry(*ipnet))
+		mutex.Unlock()
+
+		if err != nil {
+			return fmt.Errorf("cannot insert %v into ranger: %w", ipnet, err)
+		}
 	}
 
 	if scanner.Err() != nil {
@@ -194,48 +183,38 @@ func (f *Firehol) updateFromFile(mutex sync.Locker,
 	return nil
 }
 
-func (f *Firehol) updateParseLine(text string) (net.IP, uint, error) {
-	_, ipnet, err := net.ParseCIDR(text)
-	if err != nil {
-		ipaddr := net.ParseIP(text)
-		if ipaddr == nil {
-			return nil, 0, fmt.Errorf("incorrect ip address %s", text)
-		}
-
-		ip4 := ipaddr.To4()
-		if ip4 != nil {
-			return ip4, fireholIPv4DefaultCIDR, nil
-		}
-
-		return ipaddr.To16(), fireholIPv6DefaultCIDR, nil
+func (f *Firehol) updateParseLine(text string) (*net.IPNet, error) {
+	if _, ipnet, err := net.ParseCIDR(text); err == nil {
+		return ipnet, nil
 	}
 
-	ones, _ := ipnet.Mask.Size()
-
-	return ipnet.IP, uint(ones), nil
-}
-
-func (f *Firehol) updateAddToTrees(ip net.IP, cidr uint,
-	mutex sync.Locker,
-	v4tree *bool_tree.TreeV4, v6tree *bool_tree.TreeV6) {
-	mutex.Lock()
-	defer mutex.Unlock()
-
-	if ip.To4() != nil {
-		v4tree.Set(patricia.NewIPv4AddressFromBytes(ip, cidr), true)
-	} else {
-		v6tree.Set(patricia.NewIPv6Address(ip, cidr), true)
+	ipaddr := net.ParseIP(text)
+	if ipaddr == nil {
+		return nil, fmt.Errorf("incorrect ip address %s", text)
 	}
+
+	mask := fireholIPv4DefaultCIDR
+
+	if ipaddr.To4() == nil {
+		mask = fireholIPv6DefaultCIDR
+	}
+
+	return &net.IPNet{
+		IP:   ipaddr,
+		Mask: mask,
+	}, nil
 }
 
 // NewFirehol creates a new instance of FireHOL IP blocklist.
 //
-// This method does not start an update process so please execute Run
-// when it is necessary.
+// This method does not start an update process so please execute Run when it
+// is necessary.
 func NewFirehol(logger mtglib.Logger, network mtglib.Network,
 	downloadConcurrency uint,
 	urls []string,
-	localFiles []string) (*Firehol, error) {
+	localFiles []string,
+	updateCallback FireholUpdateCallback,
+) (*Firehol, error) {
 	blocklists := []files.File{}
 
 	for _, v := range localFiles {
@@ -258,12 +237,17 @@ func NewFirehol(logger mtglib.Logger, network mtglib.Network,
 		blocklists = append(blocklists, file)
 	}
 
-	return NewFireholFromFiles(logger, downloadConcurrency, blocklists)
+	return NewFireholFromFiles(logger, downloadConcurrency, blocklists, updateCallback)
 }
 
+// NewFirehol creates a new instance of FireHOL IP blocklist.
+//
+// This method creates this instances from a given list of files.
 func NewFireholFromFiles(logger mtglib.Logger,
 	downloadConcurrency uint,
-	blocklists []files.File) (*Firehol, error) {
+	blocklists []files.File,
+	updateCallback FireholUpdateCallback,
+) (*Firehol, error) {
 	if downloadConcurrency == 0 {
 		downloadConcurrency = DefaultFireholDownloadConcurrency
 	}
@@ -272,12 +256,12 @@ func NewFireholFromFiles(logger mtglib.Logger,
 	ctx, cancel := context.WithCancel(context.Background())
 
 	return &Firehol{
-		ctx:        ctx,
-		ctxCancel:  cancel,
-		logger:     logger.Named("firehol"),
-		treeV4:     bool_tree.NewTreeV4(),
-		treeV6:     bool_tree.NewTreeV6(),
-		workerPool: workerPool,
-		blocklists: blocklists,
+		ctx:            ctx,
+		ctxCancel:      cancel,
+		logger:         logger.Named("firehol"),
+		ranger:         cidranger.NewPCTrieRanger(),
+		workerPool:     workerPool,
+		blocklists:     blocklists,
+		updateCallback: updateCallback,
 	}, nil
 }

ipblocklist/firehol_test.go

@@ -35,9 +35,9 @@ func (suite *FireholTestSuite) SetupSuite() {
 			panic(err)
 		}
 
-		defer filefp.Close()
+		defer filefp.Close() //nolint: errcheck
 
-		io.Copy(w, filefp) // nolint: errcheck
+		io.Copy(w, filefp) //nolint: errcheck
 	})
 
 	suite.httpServer = httptest.NewServer(mux)
@@ -67,7 +67,8 @@ func (suite *FireholTestSuite) TearDownSuite() {
 func (suite *FireholTestSuite) TestLocalFail() {
 	blocklist, err := ipblocklist.NewFirehol(logger.NewNoopLogger(),
 		suite.networkMock, 2,
-		nil, []string{filepath.Join("testdata", "broken_ipset.ipset")})
+		nil, []string{filepath.Join("testdata", "broken_ipset.ipset")},
+		nil)
 
 	suite.NoError(err)
 
@@ -85,7 +86,8 @@ func (suite *FireholTestSuite) TestLocalFail() {
 func (suite *FireholTestSuite) TestLocalOk() {
 	blocklist, err := ipblocklist.NewFirehol(logger.NewNoopLogger(),
 		suite.networkMock, 2,
-		nil, []string{filepath.Join("testdata", "good_ipset.ipset")})
+		nil, []string{filepath.Join("testdata", "good_ipset.ipset")},
+		nil)
 
 	suite.NoError(err)
 
@@ -103,7 +105,7 @@ func (suite *FireholTestSuite) TestLocalOk() {
 func (suite *FireholTestSuite) TestRemoteFail() {
 	blocklist, err := ipblocklist.NewFirehol(logger.NewNoopLogger(),
 		suite.networkMock, 2,
-		[]string{"https://google.com"}, nil)
+		[]string{"https://google.com"}, nil, nil)
 
 	suite.NoError(err)
 
@@ -127,7 +129,7 @@ func (suite *FireholTestSuite) TestMixed() {
 			suite.httpServer.URL,
 		}, []string{
 			filepath.Join("testdata", "good_ipset.ipset"),
-		})
+		}, nil)
 
 	suite.NoError(err)
 

ipblocklist/init.go

@@ -1,8 +1,8 @@
 // Package ipblocklist contains default implementation of the
-// IPBlocklist for mtg.
+// [mtglib.IPBlocklist] for mtg.
 //
-// Please check documentation for mtglib.IPBlocklist interface to get an
-// idea of this abstraction.
+// Please check documentation for [mtglib.IPBlocklist] interface to get an idea
+// of this abstraction.
 package ipblocklist
 
 import "time"
@@ -12,7 +12,7 @@ const (
 	// concurrent downloads of ip blocklists for Firehol.
 	DefaultFireholDownloadConcurrency = 1
 
-	// DefaultFireholUpdateEach defines a default time period when
-	// Firehol requests updates of the blocklists.
+	// DefaultFireholUpdateEach defines a default time period when Firehol
+	// requests updates of the blocklists.
 	DefaultFireholUpdateEach = 6 * time.Hour
 )

ipblocklist/noop.go

@@ -2,16 +2,18 @@ package ipblocklist
 
 import (
 	"net"
+	"time"
 
 	"github.com/9seconds/mtg/v2/mtglib"
 )
 
 type noop struct{}
 
-func (n noop) Contains(ip net.IP) bool { return false }
+func (n noop) Contains(ip net.IP) bool      { return false }
+func (n noop) Run(updateEach time.Duration) {}
+func (n noop) Shutdown()                    {}
 
-// NewNoop returns a dummy ipblocklist which allows all incoming
-// connections.
+// NewNoop returns a dummy ipblocklist which allows all incoming connections.
 func NewNoop() mtglib.IPBlocklist {
 	return noop{}
 }

ipblocklist/noop_test.go

@@ -17,6 +17,13 @@ func (suite *NoopTestSuite) TestOp() {
 	suite.False(ipblocklist.NewNoop().Contains(net.ParseIP("10.0.0.10")))
 }
 
+func (suite *NoopTestSuite) TestRun() {
+	blocklist := ipblocklist.NewNoop()
+
+	blocklist.Run(0)
+	blocklist.Shutdown()
+}
+
 func TestNoop(t *testing.T) {
 	t.Parallel()
 	suite.Run(t, &NoopTestSuite{})

logger/init.go

@@ -1,14 +1,12 @@
-// Package logger has implementation of loggers for mtglib.Logger
-// interface.
+// Package logger has implementation of loggers for [mtglib.Logger] interface.
 //
-// Please see a description of that interface to get some agreements
-// which are used by mtglib.
+// Please see a description of that interface to get some agreements which are
+// used by mtglib.
 package logger
 
-// StdLikeLogger is an interface which is close to log.Logger. This is
-// commonly used by many 3pp tools. While mtglib itself does not need
-// it, it is always a good idea to support it and have a transient end
-// to end logging.
+// StdLikeLogger is an interface which is close to [log.Logger]. This is
+// commonly used by many 3pp tools. While mtglib itself does not need it, it is
+// always a good idea to support it and have a transient end to end logging.
 type StdLikeLogger interface {
-	Printf(format string, args ...interface{})
+	Printf(format string, args ...any)
 }

logger/noop.go

@@ -8,7 +8,7 @@ func (n noopLogger) Named(_ string) mtglib.Logger          { return n }
 func (n noopLogger) BindInt(_ string, _ int) mtglib.Logger { return n }
 func (n noopLogger) BindStr(_, _ string) mtglib.Logger     { return n }
 func (n noopLogger) BindJSON(_, _ string) mtglib.Logger    { return n }
-func (n noopLogger) Printf(_ string, _ ...interface{})     {}
+func (n noopLogger) Printf(_ string, _ ...any)             {}
 func (n noopLogger) Info(_ string)                         {}
 func (n noopLogger) Warning(_ string)                      {}
 func (n noopLogger) Debug(_ string)                        {}

logger/zerolog.go

@@ -78,7 +78,7 @@ func (z *zeroLogContext) BindJSON(name, value string) mtglib.Logger {
 	}
 }
 
-func (z *zeroLogContext) Printf(format string, args ...interface{}) {
+func (z *zeroLogContext) Printf(format string, args ...any) {
 	z.Debug(fmt.Sprintf(format, args...))
 }
 

logger/zerolog_test.go

@@ -116,6 +116,6 @@ func (suite *ZeroLoggerTestSuite) TestIndependence() {
 	suite.NotContains("lalala", log12Output)
 }
 
-func TestZeroLogger(t *testing.T) { // nolint: paralleltest
+func TestZeroLogger(t *testing.T) { //nolint: paralleltest
 	suite.Run(t, &ZeroLoggerTestSuite{})
 }

main.go

@@ -9,26 +9,31 @@
 package main
 
 import (
-	"math/rand"
-	"time"
-
 	"github.com/9seconds/mtg/v2/internal/cli"
-	"github.com/9seconds/mtg/v2/internal/utils"
 	"github.com/alecthomas/kong"
 )
 
-var version = "dev" // has to be set by ldflags
-
 func main() {
-	rand.Seed(time.Now().UTC().UnixNano())
-
-	if err := utils.SetLimits(); err != nil {
-		panic(err)
-	}
+	// this runs profiling server. To enable it, build with prof tag
+	//   $ go build -tags prof
+	//
+	// Then you can pass a port using MTG_PROF_PORT environment variable.
+	// Default is 6000
+	//   $ MTG_PROF_PORT=6000 mtg run config.toml
+	//
+	// It will run a webserver with profiling data on
+	// localhost:${MTG_PROF_PORT:-6000}.
+	//
+	// To collect PGO do following:
+	//   $ curl -o default.pgo 'http://localhost:6000/debug/pprof/profile?seconds=300'
+	//
+	// See also https://pkg.go.dev/net/http/pprof
+	//          https://go.dev/blog/pprof
+	runProfile()
 
 	cli := &cli.CLI{}
 	ctx := kong.Parse(cli, kong.Vars{
-		"version": version,
+		"version": getVersion(),
 	})
 
 	ctx.FatalIfErrorf(ctx.Run(cli, version))

mise.lock

@@ -0,0 +1,121 @@
+# @generated - this file is auto-generated by `mise lock` https://mise.jdx.dev/dev-tools/mise-lock.html
+
+[[tools.go]]
+version = "1.26.1"
+backend = "core:go"
+
+[tools.go."platforms.linux-arm64"]
+checksum = "sha256:a290581cfe4fe28ddd737dde3095f3dbeb7f2e4065cab4eae44dfc53b760c2f7"
+url = "https://dl.google.com/go/go1.26.1.linux-arm64.tar.gz"
+
+[tools.go."platforms.linux-arm64-musl"]
+checksum = "sha256:a290581cfe4fe28ddd737dde3095f3dbeb7f2e4065cab4eae44dfc53b760c2f7"
+url = "https://dl.google.com/go/go1.26.1.linux-arm64.tar.gz"
+
+[tools.go."platforms.linux-x64"]
+checksum = "sha256:031f088e5d955bab8657ede27ad4e3bc5b7c1ba281f05f245bcc304f327c987a"
+url = "https://dl.google.com/go/go1.26.1.linux-amd64.tar.gz"
+
+[tools.go."platforms.linux-x64-musl"]
+checksum = "sha256:031f088e5d955bab8657ede27ad4e3bc5b7c1ba281f05f245bcc304f327c987a"
+url = "https://dl.google.com/go/go1.26.1.linux-amd64.tar.gz"
+
+[tools.go."platforms.macos-arm64"]
+checksum = "sha256:353df43a7811ce284c8938b5f3c7df40b7bfb6f56cb165b150bc40b5e2dd541f"
+url = "https://dl.google.com/go/go1.26.1.darwin-arm64.tar.gz"
+
+[tools.go."platforms.macos-x64"]
+checksum = "sha256:65773dab2f8cc4cd23d93ba6d0a805de150ca0b78378879292be0b903b8cdd08"
+url = "https://dl.google.com/go/go1.26.1.darwin-amd64.tar.gz"
+
+[tools.go."platforms.windows-x64"]
+checksum = "sha256:9b68112c913f45b7aebbf13c036721264bbba7e03a642f8f7490c561eebd1ecc"
+url = "https://dl.google.com/go/go1.26.1.windows-amd64.zip"
+
+[[tools."go:golang.org/x/pkgsite/cmd/pkgsite"]]
+version = "latest"
+backend = "go:golang.org/x/pkgsite/cmd/pkgsite"
+
+[[tools."go:golang.org/x/tools/gopls"]]
+version = "0.21.1"
+backend = "go:golang.org/x/tools/gopls"
+
+[[tools."go:golang.org/x/vuln/cmd/govulncheck"]]
+version = "1.1.4"
+backend = "go:golang.org/x/vuln/cmd/govulncheck"
+
+[[tools."go:mvdan.cc/gofumpt"]]
+version = "0.9.2"
+backend = "go:mvdan.cc/gofumpt"
+
+[[tools.golangci-lint]]
+version = "2.11.4"
+backend = "aqua:golangci/golangci-lint"
+
+[tools.golangci-lint."platforms.linux-arm64"]
+checksum = "sha256:3bcfa2e6f3d32b2bf5cd75eaa876447507025e0303698633f722a05331988db4"
+url = "https://github.com/golangci/golangci-lint/releases/download/v2.11.4/golangci-lint-2.11.4-linux-arm64.tar.gz"
+
+[tools.golangci-lint."platforms.linux-arm64-musl"]
+checksum = "sha256:3bcfa2e6f3d32b2bf5cd75eaa876447507025e0303698633f722a05331988db4"
+url = "https://github.com/golangci/golangci-lint/releases/download/v2.11.4/golangci-lint-2.11.4-linux-arm64.tar.gz"
+
+[tools.golangci-lint."platforms.linux-x64"]
+checksum = "sha256:200c5b7503f67b59a6743ccf32133026c174e272b930ee79aa2aa6f37aca7ef1"
+url = "https://github.com/golangci/golangci-lint/releases/download/v2.11.4/golangci-lint-2.11.4-linux-amd64.tar.gz"
+
+[tools.golangci-lint."platforms.linux-x64-musl"]
+checksum = "sha256:200c5b7503f67b59a6743ccf32133026c174e272b930ee79aa2aa6f37aca7ef1"
+url = "https://github.com/golangci/golangci-lint/releases/download/v2.11.4/golangci-lint-2.11.4-linux-amd64.tar.gz"
+
+[tools.golangci-lint."platforms.macos-arm64"]
+checksum = "sha256:02db2a2dae8b26812e53b0688a6f617e3ef1f489790e829ea22862cf76945675"
+url = "https://github.com/golangci/golangci-lint/releases/download/v2.11.4/golangci-lint-2.11.4-darwin-arm64.tar.gz"
+provenance = "github-attestations"
+
+[tools.golangci-lint."platforms.macos-x64"]
+checksum = "sha256:c900d4048db75d1edfd550fd11cf6a9b3008e7caa8e119fcddbc700412d63e60"
+url = "https://github.com/golangci/golangci-lint/releases/download/v2.11.4/golangci-lint-2.11.4-darwin-amd64.tar.gz"
+
+[tools.golangci-lint."platforms.windows-x64"]
+checksum = "sha256:4932cfca5e75bf60fe1c576edf459e5e809e6644664a068185d64b84af3fad9e"
+url = "https://github.com/golangci/golangci-lint/releases/download/v2.11.4/golangci-lint-2.11.4-windows-amd64.zip"
+
+[[tools.goreleaser]]
+version = "2.14.3"
+backend = "aqua:goreleaser/goreleaser"
+
+[tools.goreleaser."platforms.linux-arm64"]
+checksum = "sha256:581a10e53c1176b3e81ee45cf531e02dbf899db0bc7b795669347df4276ce948"
+url = "https://github.com/goreleaser/goreleaser/releases/download/v2.14.3/goreleaser_Linux_arm64.tar.gz"
+provenance = "cosign"
+
+[tools.goreleaser."platforms.linux-arm64-musl"]
+checksum = "sha256:581a10e53c1176b3e81ee45cf531e02dbf899db0bc7b795669347df4276ce948"
+url = "https://github.com/goreleaser/goreleaser/releases/download/v2.14.3/goreleaser_Linux_arm64.tar.gz"
+provenance = "cosign"
+
+[tools.goreleaser."platforms.linux-x64"]
+checksum = "sha256:dc7faeeeb6da8bdfda788626263a4ae725892a8c7504b975c3234127d4a44579"
+url = "https://github.com/goreleaser/goreleaser/releases/download/v2.14.3/goreleaser_Linux_x86_64.tar.gz"
+provenance = "cosign"
+
+[tools.goreleaser."platforms.linux-x64-musl"]
+checksum = "sha256:dc7faeeeb6da8bdfda788626263a4ae725892a8c7504b975c3234127d4a44579"
+url = "https://github.com/goreleaser/goreleaser/releases/download/v2.14.3/goreleaser_Linux_x86_64.tar.gz"
+provenance = "cosign"
+
+[tools.goreleaser."platforms.macos-arm64"]
+checksum = "sha256:3507798489e107a78aff36b169de48148a335ac26eb3161608d905f3f3a957bd"
+url = "https://github.com/goreleaser/goreleaser/releases/download/v2.14.3/goreleaser_Darwin_all.tar.gz"
+provenance = "cosign"
+
+[tools.goreleaser."platforms.macos-x64"]
+checksum = "sha256:3507798489e107a78aff36b169de48148a335ac26eb3161608d905f3f3a957bd"
+url = "https://github.com/goreleaser/goreleaser/releases/download/v2.14.3/goreleaser_Darwin_all.tar.gz"
+provenance = "cosign"
+
+[tools.goreleaser."platforms.windows-x64"]
+checksum = "sha256:3deea8ff471aa258a2d99f3e5302971d7028647ae8ddaf103257a8113e485a31"
+url = "https://github.com/goreleaser/goreleaser/releases/download/v2.14.3/goreleaser_Windows_x86_64.zip"
+provenance = "cosign"

mtglib/conns.go

@@ -3,10 +3,13 @@ package mtglib
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"io"
-	"sync"
+	"net"
+	"time"
 
 	"github.com/9seconds/mtg/v2/essentials"
+	"github.com/pires/go-proxyproto"
 )
 
 type connTraffic struct {
@@ -24,7 +27,7 @@ func (c connTraffic) Read(b []byte) (int, error) {
 		c.stream.Send(c.ctx, NewEventTraffic(c.streamID, uint(n), true))
 	}
 
-	return n, err // nolint: wrapcheck
+	return n, err //nolint: wrapcheck
 }
 
 func (c connTraffic) Write(b []byte) (int, error) {
@@ -34,28 +37,21 @@ func (c connTraffic) Write(b []byte) (int, error) {
 		c.stream.Send(c.ctx, NewEventTraffic(c.streamID, uint(n), false))
 	}
 
-	return n, err // nolint: wrapcheck
+	return n, err //nolint: wrapcheck
 }
 
 type connRewind struct {
 	essentials.Conn
 
-	active io.Reader
 	buf    bytes.Buffer
-	mutex  sync.RWMutex
+	active io.Reader
 }
 
 func (c *connRewind) Read(p []byte) (int, error) {
-	c.mutex.RLock()
-	defer c.mutex.RUnlock()
-
-	return c.active.Read(p) // nolint: wrapcheck
+	return c.active.Read(p)
 }
 
 func (c *connRewind) Rewind() {
-	c.mutex.Lock()
-	defer c.mutex.Unlock()
-
 	c.active = io.MultiReader(&c.buf, c.Conn)
 }
 
@@ -67,3 +63,54 @@ func newConnRewind(conn essentials.Conn) *connRewind {
 
 	return rv
 }
+
+type connProxyProtocol struct {
+	essentials.Conn
+
+	sourceAddr     net.Addr
+	headersWritten bool
+}
+
+func (c *connProxyProtocol) Write(p []byte) (int, error) {
+	if !c.headersWritten {
+		headers := proxyproto.HeaderProxyFromAddrs(2, c.sourceAddr, c.RemoteAddr())
+
+		toSend, err := headers.Format()
+		if err != nil {
+			panic(err)
+		}
+
+		if _, err := c.Conn.Write(toSend); err != nil {
+			return 0, fmt.Errorf("cannot send proxy protocol header: %w", err)
+		}
+
+		c.headersWritten = true
+	}
+
+	return c.Conn.Write(p)
+}
+
+func newConnProxyProtocol(source, target essentials.Conn) *connProxyProtocol {
+	return &connProxyProtocol{
+		Conn:       target,
+		sourceAddr: source.RemoteAddr(),
+	}
+}
+
+type connIdleTimeout struct {
+	essentials.Conn
+
+	timeout time.Duration
+}
+
+func (c connIdleTimeout) Read(b []byte) (int, error) {
+	c.SetReadDeadline(time.Now().Add(c.timeout)) //nolint: errcheck
+
+	return c.Conn.Read(b) //nolint: wrapcheck
+}
+
+func (c connIdleTimeout) Write(b []byte) (int, error) {
+	c.SetWriteDeadline(time.Now().Add(c.timeout)) //nolint: errcheck
+
+	return c.Conn.Write(b) //nolint: wrapcheck
+}

mtglib/conns_internal_test.go

@@ -1,14 +1,17 @@
 package mtglib
 
 import (
+	"bufio"
 	"bytes"
 	"context"
 	"errors"
 	"io"
+	"net"
 	"testing"
 	"time"
 
 	"github.com/9seconds/mtg/v2/internal/testlib"
+	"github.com/pires/go-proxyproto"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/suite"
 )
@@ -22,7 +25,7 @@ type ConnRewindBaseConn struct {
 func (c *ConnRewindBaseConn) Read(p []byte) (int, error) {
 	c.Called(p)
 
-	return c.readBuffer.Read(p) // nolint: wrapcheck
+	return c.readBuffer.Read(p) //nolint: wrapcheck
 }
 
 type ConnTrafficTestSuite struct {
@@ -69,7 +72,7 @@ func (suite *ConnTrafficTestSuite) TestReadOk() {
 	suite.Equal(10, n)
 }
 
-func (suite *ConnTrafficTestSuite) TestReadErr() { // nolint: dupl
+func (suite *ConnTrafficTestSuite) TestReadErr() { //nolint: dupl
 	suite.eventStreamMock.
 		On("Send", mock.Anything, mock.Anything).
 		Once().
@@ -125,7 +128,7 @@ func (suite *ConnTrafficTestSuite) TestWriteOk() {
 	suite.Equal(10, n)
 }
 
-func (suite *ConnTrafficTestSuite) TestWriteErr() { // nolint: dupl
+func (suite *ConnTrafficTestSuite) TestWriteErr() { //nolint: dupl
 	suite.eventStreamMock.
 		On("Send", mock.Anything, mock.Anything).
 		Once().
@@ -200,6 +203,94 @@ func (suite *ConnRewindTestSuite) TestRead() {
 	suite.Equal([]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, data)
 }
 
+type ConnProxyProtocolTestSuite struct {
+	suite.Suite
+
+	sourceConnMock *testlib.EssentialsConnMock
+	targetConnMock *testlib.EssentialsConnMock
+	conn           *connProxyProtocol
+}
+
+func (suite *ConnProxyProtocolTestSuite) SetupTest() {
+	suite.sourceConnMock = &testlib.EssentialsConnMock{}
+	suite.targetConnMock = &testlib.EssentialsConnMock{}
+
+	localAddr := &net.TCPAddr{
+		IP: net.ParseIP("127.0.0.1").To4(),
+	}
+	remoteAddr := &net.TCPAddr{
+		IP: net.ParseIP("127.0.0.2").To4(),
+	}
+
+	suite.sourceConnMock.
+		On("RemoteAddr").
+		Return(localAddr)
+	suite.targetConnMock.
+		On("RemoteAddr").
+		Maybe().
+		Return(remoteAddr)
+
+	suite.conn = newConnProxyProtocol(suite.sourceConnMock, suite.targetConnMock)
+}
+
+func (suite *ConnProxyProtocolTestSuite) TestRead() {
+	value := []byte{1, 2, 3, 4, 5}
+	toRead := make([]byte, len(value))
+
+	suite.targetConnMock.
+		On("Read", mock.AnythingOfType("[]uint8")).
+		Once().
+		Return(len(toRead), nil).
+		Run(func(args mock.Arguments) {
+			arr := args.Get(0).([]byte)
+			copy(arr, value)
+		})
+
+	n, err := suite.conn.Read(toRead)
+	suite.Equal(len(value), n)
+	suite.NoError(err)
+	suite.Equal(value, toRead)
+}
+
+func (suite *ConnProxyProtocolTestSuite) TestWrite() {
+	value := []byte{1, 2, 3, 4, 5}
+	buf := &bytes.Buffer{}
+	bufReader := bufio.NewReader(buf)
+
+	suite.targetConnMock.
+		On("Write", mock.AnythingOfType("[]uint8")).
+		Return(28, nil).
+		Run(func(args mock.Arguments) {
+			arr := args.Get(0).([]byte)
+			buf.Write(arr)
+		})
+
+	_, err := suite.conn.Write(value)
+	suite.NoError(err)
+
+	header, err := proxyproto.Read(bufReader)
+	suite.NoError(err)
+
+	sourceAddr, destAddr, ok := header.TCPAddrs()
+	suite.True(ok)
+	suite.Equal(suite.sourceConnMock.RemoteAddr(), sourceAddr)
+	suite.Equal(suite.targetConnMock.RemoteAddr(), destAddr)
+
+	read, _ := io.ReadAll(bufReader)
+	suite.Equal(value, read)
+
+	_, err = suite.conn.Write(value)
+	suite.NoError(err)
+
+	read, _ = io.ReadAll(bufReader)
+	suite.Equal(value, read)
+}
+
+func (suite *ConnProxyProtocolTestSuite) TearDownTest() {
+	suite.sourceConnMock.AssertExpectations(suite.T())
+	suite.targetConnMock.AssertExpectations(suite.T())
+}
+
 func TestConnTraffic(t *testing.T) {
 	t.Parallel()
 	suite.Run(t, &ConnTrafficTestSuite{})
@@ -209,3 +300,8 @@ func TestConnRewind(t *testing.T) {
 	t.Parallel()
 	suite.Run(t, &ConnRewindTestSuite{})
 }
+
+func TestConnProxyProtocol(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &ConnProxyProtocolTestSuite{})
+}

mtglib/events.go

@@ -29,13 +29,13 @@ type EventStart struct {
 	RemoteIP net.IP
 }
 
-// EventConnectedToDC is emitted when mtg proxy has connected to a
-// Telegram server.
+// EventConnectedToDC is emitted when mtg proxy has connected to a Telegram
+// server.
 type EventConnectedToDC struct {
 	eventBase
 
-	// RemoteIP is an IP address of the Telegram server proxy has been
-	// connected to.
+	// RemoteIP is an IP address of the Telegram server proxy has been connected
+	// to.
 	RemoteIP net.IP
 
 	// DC is an index of the datacenter proxy has been connected to.
@@ -49,15 +49,15 @@ type EventTraffic struct {
 	// Traffic is a count of bytes which were transmitted.
 	Traffic uint
 
-	// IsRead defines if we _read_ or _write_ to connection. A rule of
-	// thumb is simple: EventTraffic is bound to a remote connection. Not
-	// to a client one, but either to Telegram or front domain one.
+	// IsRead defines if we _read_ or _write_ to connection. A rule of thumb is
+	// simple: EventTraffic is bound to a remote connection. Not to a client one,
+	// but either to Telegram or front domain one.
 	//
-	// In the case of Telegram, isRead means that we've fetched some bytes
-	// from Telegram to send it to a client.
+	// In the case of Telegram, isRead means that we've fetched some bytes from
+	// Telegram to send it to a client.
 	//
-	// In the case of the front domain, it means that we've fetched some
-	// bytes from this domain to send it to a client.
+	// In the case of the front domain, it means that we've fetched some bytes
+	// from this domain to send it to a client.
 	IsRead bool
 }
 
@@ -66,24 +66,25 @@ type EventFinish struct {
 	eventBase
 }
 
-// EventDomainFronting is emitted when we connect to a front domain
-// instead of Telegram server.
+// EventDomainFronting is emitted when we connect to a front domain instead of
+// Telegram server.
 type EventDomainFronting struct {
 	eventBase
 }
 
-// EventConcurrencyLimited is emitted when connection was declined
-// because of the concurrency limit of the worker pool.
+// EventConcurrencyLimited is emitted when connection was declined because of
+// the concurrency limit of the worker pool.
 type EventConcurrencyLimited struct {
 	eventBase
 }
 
-// EventIPBlocklisted is emitted when connection was declined because
-// IP address was found in IP blocklist.
+// EventIPBlocklisted is emitted when connection was declined because IP
+// address was found in IP blocklist.
 type EventIPBlocklisted struct {
 	eventBase
 
-	RemoteIP net.IP
+	RemoteIP    net.IP
+	IsBlockList bool
 }
 
 // EventReplayAttack is emitted when mtg detects a replay attack on a
@@ -92,6 +93,15 @@ type EventReplayAttack struct {
 	eventBase
 }
 
+// EventIPListSize is emitted when mtg updates a contents of the ip lists:
+// allowlist or blocklist.
+type EventIPListSize struct {
+	eventBase
+
+	Size        int
+	IsBlockList bool
+}
+
 // NewEventStart creates a new EventStart event.
 func NewEventStart(streamID string, remoteIP net.IP) EventStart {
 	return EventStart{
@@ -163,7 +173,20 @@ func NewEventIPBlocklisted(remoteIP net.IP) EventIPBlocklisted {
 		eventBase: eventBase{
 			timestamp: time.Now(),
 		},
-		RemoteIP: remoteIP,
+		RemoteIP:    remoteIP,
+		IsBlockList: true,
+	}
+}
+
+// NewEventIPAllowlisted creates a NewEventIPBlocklisted event with a mark that
+// it is supposed to be for allow list.
+func NewEventIPAllowlisted(remoteIP net.IP) EventIPBlocklisted {
+	return EventIPBlocklisted{
+		eventBase: eventBase{
+			timestamp: time.Now(),
+		},
+		RemoteIP:    remoteIP,
+		IsBlockList: false,
 	}
 }
 
@@ -176,3 +199,14 @@ func NewEventReplayAttack(streamID string) EventReplayAttack {
 		},
 	}
 }
+
+// NewEventIPListSize creates a new EventIPListSize event.
+func NewEventIPListSize(size int, isBlockList bool) EventIPListSize {
+	return EventIPListSize{
+		eventBase: eventBase{
+			timestamp: time.Now(),
+		},
+		Size:        size,
+		IsBlockList: isBlockList,
+	}
+}

mtglib/events_test.go

@@ -60,6 +60,15 @@ func (suite *EventsTestSuite) TestEventIPBlocklisted() {
 
 	suite.Empty(evt.StreamID())
 	suite.WithinDuration(time.Now(), evt.Timestamp(), 10*time.Millisecond)
+	suite.True(evt.IsBlockList)
+}
+
+func (suite *EventsTestSuite) TestEventIPAllowlisted() {
+	evt := mtglib.NewEventIPAllowlisted(net.ParseIP("10.0.0.10"))
+
+	suite.Empty(evt.StreamID())
+	suite.WithinDuration(time.Now(), evt.Timestamp(), 10*time.Millisecond)
+	suite.False(evt.IsBlockList)
 }
 
 func (suite *EventsTestSuite) TestEventReplayAttack() {
@@ -69,6 +78,15 @@ func (suite *EventsTestSuite) TestEventReplayAttack() {
 	suite.WithinDuration(time.Now(), evt.Timestamp(), 10*time.Millisecond)
 }
 
+func (suite *EventsTestSuite) TestEventIPListSize() {
+	evt := mtglib.NewEventIPListSize(10, false)
+
+	suite.Empty(evt.StreamID())
+	suite.WithinDuration(time.Now(), evt.Timestamp(), 10*time.Millisecond)
+	suite.Equal(10, evt.Size)
+	suite.False(evt.IsBlockList)
+}
+
 func TestEvents(t *testing.T) {
 	t.Parallel()
 	suite.Run(t, &EventsTestSuite{})

mtglib/init.go

@@ -1,20 +1,19 @@
 // mtglib defines a package with MTPROTO proxy.
 //
-// Since mtg itself is build as an example of how to work with mtglib,
-// it worth to telling a couple of words about a project organization.
+// Since mtg itself is build as an example of how to work with mtglib, it worth
+// to telling a couple of words about a project organization.
 //
-// A core object of the project is mtglib.Proxy. This is a proxy you
-// expect: that one which you configure, set to serve on a listener
-// and/or shutdown on application termination.
+// A core object of the project is [mtglib.Proxy]. This is a proxy you expect:
+// that one which you configure, set to serve on a listener and/or shutdown on
+// application termination.
 //
-// But it also has a core logic unrelated to Telegram per se: anti
-// replay cache, network connectivity (who knows, maybe you want to have
-// a native VMESS integration) and so on.
+// But it also has a core logic unrelated to Telegram per se: anti replay
+// cache, network connectivity (who knows, maybe you want to have a native
+// VMESS integration) and so on.
 //
-// You can supply such parts to a proxy with interfaces. The rest of
-// the packages in mtg define some default implementations of these
-// interfaces. But if you want to integrate it with, let say, influxdb,
-// you can do it easily.
+// You can supply such parts to a proxy with interfaces. The rest of the
+// packages in mtg define some default implementations of these interfaces. But
+// if you want to integrate it with, let say, influxdb, you can do it easily.
 package mtglib
 
 import (
@@ -28,38 +27,42 @@ import (
 )
 
 var (
-	// ErrSecretEmpty is returned if you are trying to create a proxy
-	// but do not provide a secret.
+	// ErrSecretEmpty is returned if you are trying to create a proxy but do not
+	// provide a secret.
 	ErrSecretEmpty = errors.New("secret is empty")
 
-	// ErrSecretInvalid is returned if you are trying to create a proxy
-	// but secret value is invalid (no host or payload are zeroes).
+	// ErrSecretInvalid is returned if you are trying to create a proxy but secret
+	// value is invalid (no host or payload are zeroes).
 	ErrSecretInvalid = errors.New("secret is invalid")
 
-	// ErrNetworkIsNotDefined is returned if you are trying to create a
-	// proxy but network value is undefined.
+	// ErrNetworkIsNotDefined is returned if you are trying to create a proxy but
+	// network value is undefined.
 	ErrNetworkIsNotDefined = errors.New("network is not defined")
 
-	// ErrAntiReplayCacheIsNotDefined is returned if you are trying to
-	// create a proxy but anti replay cache value is undefined.
+	// ErrAntiReplayCacheIsNotDefined is returned if you are trying to create a
+	// proxy but anti replay cache value is undefined.
 	ErrAntiReplayCacheIsNotDefined = errors.New("anti-replay cache is not defined")
 
-	// ErrIPBlocklistIsNotDefined is returned if you are trying to
-	// create a proxy but ip blocklist instance is not defined.
+	// ErrIPBlocklistIsNotDefined is returned if you are trying to create a proxy
+	// but ip blocklist instance is not defined.
 	ErrIPBlocklistIsNotDefined = errors.New("ip blocklist is not defined")
 
-	// ErrEventStreamIsNotDefined is returned if you are trying to create a
-	// proxy but event stream instance is not defined.
+	// ErrIPAllowlistIsNotDefined is returned if you are trying to create a proxy
+	// but ip allowlist instance is not defined.
+	ErrIPAllowlistIsNotDefined = errors.New("ip allowlist is not defined")
+
+	// ErrEventStreamIsNotDefined is returned if you are trying to create a proxy
+	// but event stream instance is not defined.
 	ErrEventStreamIsNotDefined = errors.New("event stream is not defined")
 
-	// ErrLoggerIsNotDefined is returned if you are trying to
-	// create a proxy but logger is not defined.
+	// ErrLoggerIsNotDefined is returned if you are trying to create a proxy but
+	// logger is not defined.
 	ErrLoggerIsNotDefined = errors.New("logger is not defined")
 )
 
 const (
-	// DefaultConcurrency is a default max count of simultaneously
-	// connected clients.
+	// DefaultConcurrency is a default max count of simultaneously connected
+	// clients.
 	DefaultConcurrency = 4096
 
 	// DefaultBufferSize is a default size of a copy buffer.
@@ -67,151 +70,156 @@ const (
 	// Deprecated: this setting no longer makes any effect.
 	DefaultBufferSize = 16 * 1024 // 16 kib
 
-	// DefaultDomainFrontingPort is a default port (HTTPS) to connect to in
-	// case of probe-resistance activity.
+	// DefaultDomainFrontingPort is a default port (HTTPS) to connect to in case
+	// of probe-resistance activity.
 	DefaultDomainFrontingPort = 443
 
-	// DefaultIdleTimeout is a default timeout for closing a connection
-	// in case of idling.
+	// DefaultIdleTimeout is a default timeout for closing a connection in case of
+	// idling.
 	//
-	// Deprecated: no longer in use because of changed TCP relay
-	// algorithm.
+	// Deprecated: no longer in use because of changed TCP relay algorithm.
 	DefaultIdleTimeout = time.Minute
 
-	// DefaultTolerateTimeSkewness is a default timeout for time
-	// skewness on a faketls timeout verification.
+	// DefaultTolerateTimeSkewness is a default timeout for time skewness on a
+	// faketls timeout verification.
 	DefaultTolerateTimeSkewness = 3 * time.Second
 
-	// DefaultPreferIP is a default value for Telegram IP connectivity
-	// preference.
+	// DefaultPreferIP is a default value for Telegram IP connectivity preference.
 	DefaultPreferIP = "prefer-ipv6"
 
-	// SecretKeyLength defines a length of the secret bytes used
-	// by Telegram and a proxy.
+	// SecretKeyLength defines a length of the secret bytes used by Telegram and a
+	// proxy.
 	SecretKeyLength = 16
 
-	// ConnectionIDBytesLength defines a count of random bytes used to generate
-	// a stream/connection ids.
+	// ConnectionIDBytesLength defines a count of random bytes used to generate a
+	// stream/connection ids.
 	ConnectionIDBytesLength = 16
 
 	// TCPRelayReadTimeout defines a max time period between two consecuitive
 	// reads from Telegram after which connection will be terminated. This is
 	// required to abort stale connections.
 	TCPRelayReadTimeout = 20 * time.Second
+
+	// DoppelGangerPerRaid defines a number of requests to each URL
+	// per raid.
+	DoppelGangerPerRaid = 10
+
+	// DoppelGangerEach defines a time period between each crawl attempt.
+	DoppelGangerEach = 6 * time.Hour
 )
 
-// Network defines a knowledge how to work with a network. It may sound
-// fun but it encapsulates all the knowledge how to properly establish
-// connections to remote hosts and configure HTTP clients.
+// Network defines a knowledge how to work with a network. It may sound fun but
+// it encapsulates all the knowledge how to properly establish connections to
+// remote hosts and configure HTTP clients.
 //
-// For example, if you want to use SOCKS5 proxy, you probably want to
-// have all traffic routed to this proxy: telegram connections, http
-// requests and so on. This knowledge is encapsulated into instances of
-// such interface.
+// For example, if you want to use SOCKS5 proxy, you probably want to have all
+// traffic routed to this proxy: telegram connections, http requests and so on.
+// This knowledge is encapsulated into instances of such interface.
 //
 // mtglib uses Network for:
-//
-// 1. Dialing to Telegram
-//
-// 2. Dialing to front domain
-//
-// 3. Doing HTTP requests (for example, for FireHOL ipblocklist).
+//  1. Dialing to Telegram
+//  2. Dialing to front domain
+//  3. Doing HTTP requests (for example, for FireHOL ipblocklist).
 type Network interface {
 	// Dial establishes context-free TCP connections.
 	Dial(network, address string) (essentials.Conn, error)
 
-	// DialContext dials using a context. This is a preferrable
-	// way of establishing TCP connections.
+	// DialContext dials using a context. This is a preferable way of
+	// establishing TCP connections.
 	DialContext(ctx context.Context, network, address string) (essentials.Conn, error)
 
-	// MakeHTTPClient build an HTTP client with given dial function. If
-	// nothing is provided, then DialContext of this interface is going
-	// to be used.
+	// MakeHTTPClient build an HTTP client with given dial function. If nothing is
+	// provided, then DialContext of this interface is going to be used.
 	MakeHTTPClient(func(ctx context.Context, network, address string) (essentials.Conn, error)) *http.Client
+
+	// NativeDialer returns a configured instance of native dialer that
+	// skips proxy connections or any other irrelevant settings.
+	NativeDialer() *net.Dialer
 }
 
-// AntiReplayCache is an interface that is used to detect replay attacks
-// based on some traffic fingerprints.
+// AntiReplayCache is an interface that is used to detect replay attacks based
+// on some traffic fingerprints.
 //
-// Replay attacks are probe attacks whose main goal is to identify if
-// server software can be classified in some way. For example, if you
-// send some HTTP request to a web server, then you can expect that this
-// server will respond with HTTP response back.
+// Replay attacks are probe attacks whose main goal is to identify if server
+// software can be classified in some way. For example, if you send some HTTP
+// request to a web server, then you can expect that this server will respond
+// with HTTP response back.
 //
-// There is a problem though. Let's imagine, that connection is
-// encrypted. Let's imagine, that it is encrypted with some static key
-// like ShadowSocks (https://shadowsocks.org/assets/whitepaper.pdf).
-// In that case, in theory, if you repeat the same bytes, you can get
-// the same responses. Let's imagine, that you've cracked the key. then
-// if you send the same bytes, you can decrypt a response and see its
-// structure. Based on its structure you can identify if this server is
-// SOCKS5, MTPROTO proxy etc.
+// There is a problem though. Let's imagine, that connection is encrypted.
+// Let's imagine, that it is encrypted with some static key like [ShadowSocks].
+// In that case, in theory, if you repeat the same bytes, you can get the same
+// responses. Let's imagine, that you've cracked the key. then if you send the
+// same bytes, you can decrypt a response and see its structure. Based on its
+// structure you can identify if this server is SOCKS5, MTPROTO proxy etc.
 //
-// This is just one example, maybe not the best or not the most
-// relevant. In real life, different organizations use such replay
-// attacks to perform some reverse engineering of the proxy, do some
-// statical analysis to identify server software.
+// This is just one example, maybe not the best or not the most relevant. In
+// real life, different organizations use such replay attacks to perform some
+// reverse engineering of the proxy, do some statical analysis to identify
+// server software.
 //
-// There are many ways how to protect your proxy against them. One
-// is domain fronting which is a core part of mtg. Another one is to
-// collect some 'handshake fingerprints' and forbid duplication.
+// There are many ways how to protect your proxy against them. One is domain
+// fronting which is a core part of mtg. Another one is to collect some
+// 'handshake fingerprints' and forbid duplication.
 //
-// So, it one is sending the same byte flow right after you (or a couple
-// of hours after), mtg should detect that and reject this connection
-// (or redirect to fronting domain).
+// So, it one is sending the same byte flow right after you (or a couple of
+// hours after), mtg should detect that and reject this connection (or redirect
+// to fronting domain).
+//
+// [ShadowSocks]: https://shadowsocks.org/assets/whitepaper.pdf
 type AntiReplayCache interface {
-	// Seen before checks if this set of bytes was observed before or
-	// not. If it is required to store this information somewhere else,
-	// then it has to do that.
+	// Seen before checks if this set of bytes was observed before or not. If it
+	// is required to store this information somewhere else, then it has to do
+	// that.
 	SeenBefore(data []byte) bool
 }
 
 // IPBlocklist filters requests based on IP address.
 //
-// If this filter has an IP address, then mtg closes a request without
-// reading anything from a socket. It also does not give such request to
-// a worker pool, so in worst cases you can expect that you invoke this
-// object more frequent than defined proxy concurrency.
+// If this filter has an IP address, then mtg closes a request without reading
+// anything from a socket. It also does not give such request to a worker pool,
+// so in worst cases you can expect that you invoke this object more frequent
+// than defined proxy concurrency.
 type IPBlocklist interface {
-	// Contains checks if given IP address belongs to this blocklist If.
-	// it is, a connection is terminated                               .
+	// Contains checks if given IP address belongs to this blocklist If. it is, a
+	// connection is terminated .
 	Contains(net.IP) bool
+
+	// Run starts a background update procedure for a blocklist
+	Run(time.Duration)
+
+	// Shutdown stops a blocklist. It is assumed that none will access it after.
+	Shutdown()
 }
 
-// Event is a data structure which is populated during mtg request
-// processing lifecycle. Each request popluates many events:
+// Event is a data structure which is populated during mtg request processing
+// lifecycle. Each request popluates many events:
+//  1. Client connected
+//  2. Request is finished
+//  3. Connection to Telegram server is established
 //
-// 1. Client connected
-//
-// 2. Request is finished
-//
-// 3. Connection to Telegram server is established
-//
-// and so on. All these events are data structures but all of them
-// must conform the same interface.
+// and so on. All these events are data structures but all of them must conform
+// the same interface.
 type Event interface {
-	// StreamID returns an identifier of the stream, connection,
-	// request, you name it. All events within the same stream returns
-	// the same stream id.
+	// StreamID returns an identifier of the stream, connection, request, you name
+	// it. All events within the same stream returns the same stream id.
 	StreamID() string
 
 	// Timestamp returns a timestamp when this event was generated.
 	Timestamp() time.Time
 }
 
-// EventStream is an abstraction that accepts a set of events produced
-// by mtg. Its main goal is to inject your logging or monitoring system.
+// EventStream is an abstraction that accepts a set of events produced by mtg.
+// Its main goal is to inject your logging or monitoring system.
 //
-// The idea is simple. When mtg works, it emits a set of events during
-// a lifecycle of the requestor: EventStart, EventFinish etc. mtg is a
-// producer which puts these events into a stream. Responsibility of
-// the stream is to deliver this event to consumers/observers. There
-// might be many different observers (for example, you want to have both
-// statsd and prometheus), mtg should know nothing about them.
+// The idea is simple. When mtg works, it emits a set of events during a
+// lifecycle of the requestor: EventStart, EventFinish etc. mtg is a producer
+// which puts these events into a stream. Responsibility of the stream is to
+// deliver this event to consumers/observers. There might be many different
+// observers (for example, you want to have both statsd and prometheus), mtg
+// should know nothing about them.
 type EventStream interface {
-	// Send delivers an event to observers. Given context has to be
-	// respected. If the context is closed, all blocking operations should
-	// be released ASAP.
+	// Send delivers an event to observers. Given context has to be respected. If
+	// the context is closed, all blocking operations should be released ASAP.
 	//
 	// It is possible that context is closed but the message is delivered.
 	// EventStream implementations should solve this issue somehow.
@@ -220,27 +228,26 @@ type EventStream interface {
 
 // Logger defines an interface of the logger used by mtglib.
 //
-// Each logger has a name. It is possible to stack names to organize
-// poor-man namespaces. Also, each logger must be able to bind
-// parameters to avoid pushing them all the time.
+// Each logger has a name. It is possible to stack names to organize poor-man
+// namespaces. Also, each logger must be able to bind parameters to avoid
+// pushing them all the time.
 //
 // Example
 //
-//     logger := SomeLogger{}
-//     logger = logger.BindStr("ip", net.IP{127, 0, 0, 1})
-//     logger.Info("Hello")
+//	logger := SomeLogger{} logger = logger.BindStr("ip", net.IP{127, 0, 0, 1})
+//	logger.Info("Hello")
 //
-// In that case, ip is bound as a parameter. It is a great idea to
-// put this parameter somewhere in a log message.
+// In that case, ip is bound as a parameter. It is a great idea to put this
+// parameter somewhere in a log message.
 //
-//     logger1 = logger.BindStr("param1", "11")
-//     logger2 = logger.BindInt("param2", 11)
+//	logger1 = logger.BindStr("param1", "11") logger2 = logger.BindInt("param2",
+//	11)
 //
 // logger1 should see no param2 and vice versa, logger2 should not see param1
 // If you attach a parameter to a logger, parents should not know about that.
 type Logger interface {
-	// Named returns a new logger with a bound name. Name chaining is
-	// allowed and appreciated.
+	// Named returns a new logger with a bound name. Name chaining is allowed and
+	// appreciated.
 	Named(name string) Logger
 
 	// BindInt binds new integer parameter to a new logger instance.
@@ -253,27 +260,26 @@ type Logger interface {
 	BindJSON(name, value string) Logger
 
 	// Printf is to support log.Logger behavior.
-	Printf(format string, args ...interface{})
+	Printf(format string, args ...any)
 
 	// Info puts a message about some normal situation.
 	Info(msg string)
 
-	// InfoError puts a message about some normal situation but this
-	// situation is related to a given error.
+	// InfoError puts a message about some normal situation but this situation is
+	// related to a given error.
 	InfoError(msg string, err error)
 
-	// Warning puts a message about some extraordinary situation
-	// worth to look at.
+	// Warning puts a message about some extraordinary situation worth to look at.
 	Warning(msg string)
 
-	// WarningError puts a message about some extraordinary situation
-	// worth to look at. This situation is related to a given error.
+	// WarningError puts a message about some extraordinary situation worth to
+	// look at. This situation is related to a given error.
 	WarningError(msg string, err error)
 
 	// Debug puts a message useful for debugging only.
 	Debug(msg string)
 
-	// Debug puts a message useful for debugging only. This message is
-	// related to a given error.
+	// Debug puts a message useful for debugging only. This message is related to
+	// a given error.
 	DebugError(msg string, err error)
 }

mtglib/init_internal_test.go

@@ -8,17 +8,17 @@ import (
 
 type NoopLogger struct{}
 
-func (n NoopLogger) Named(_ string) Logger             { return n }
-func (n NoopLogger) BindInt(_ string, _ int) Logger    { return n }
-func (n NoopLogger) BindStr(_, _ string) Logger        { return n }
-func (n NoopLogger) BindJSON(_, _ string) Logger       { return n }
-func (n NoopLogger) Printf(_ string, _ ...interface{}) {}
-func (n NoopLogger) Info(_ string)                     {}
-func (n NoopLogger) Warning(_ string)                  {}
-func (n NoopLogger) Debug(_ string)                    {}
-func (n NoopLogger) InfoError(_ string, _ error)       {}
-func (n NoopLogger) WarningError(_ string, _ error)    {}
-func (n NoopLogger) DebugError(_ string, _ error)      {}
+func (n NoopLogger) Named(_ string) Logger          { return n }
+func (n NoopLogger) BindInt(_ string, _ int) Logger { return n }
+func (n NoopLogger) BindStr(_, _ string) Logger     { return n }
+func (n NoopLogger) BindJSON(_, _ string) Logger    { return n }
+func (n NoopLogger) Printf(_ string, _ ...any)      {}
+func (n NoopLogger) Info(_ string)                  {}
+func (n NoopLogger) Warning(_ string)               {}
+func (n NoopLogger) Debug(_ string)                 {}
+func (n NoopLogger) InfoError(_ string, _ error)    {}
+func (n NoopLogger) WarningError(_ string, _ error) {}
+func (n NoopLogger) DebugError(_ string, _ error)   {}
 
 type EventStreamMock struct {
 	mock.Mock

mtglib/internal/dc/addr.go

@@ -0,0 +1,17 @@
+package dc
+
+import (
+	"fmt"
+
+	"github.com/9seconds/mtg/v2/mtglib/internal/obfuscation"
+)
+
+type Addr struct {
+	Network    string
+	Address    string
+	Obfuscator obfuscation.Obfuscator
+}
+
+func (d Addr) String() string {
+	return fmt.Sprintf("addr=%s, secret=%v", d.Address, d.Obfuscator.Secret)
+}

mtglib/internal/dc/addr_set.go

@@ -0,0 +1,33 @@
+package dc
+
+import "math/rand/v2"
+
+type dcAddrSet struct {
+	v4 map[int][]Addr
+	v6 map[int][]Addr
+}
+
+func (d dcAddrSet) getV4(dc int) []Addr {
+	if d.v4 == nil {
+		return nil
+	}
+	return d.get(d.v4[dc])
+}
+
+func (d dcAddrSet) getV6(dc int) []Addr {
+	if d.v6 == nil {
+		return nil
+	}
+	return d.get(d.v6[dc])
+}
+
+func (d dcAddrSet) get(addrs []Addr) []Addr {
+	otherSet := make([]Addr, 0, len(addrs))
+	otherSet = append(otherSet, addrs...)
+
+	rand.Shuffle(len(otherSet), func(i, j int) {
+		otherSet[i], otherSet[j] = otherSet[j], otherSet[i]
+	})
+
+	return otherSet
+}

mtglib/internal/dc/init.go

@@ -0,0 +1,77 @@
+package dc
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/9seconds/mtg/v2/essentials"
+)
+
+type preferIP uint8
+
+const (
+	preferIPOnlyIPv4 preferIP = iota
+	preferIPOnlyIPv6
+	preferIPPreferIPv4
+	preferIPPreferIPv6
+)
+
+const (
+	// Default DC to connect to if not sure.
+	DefaultDC = 2
+
+	// How often should we request updates from
+	// https://core.telegram.org/getProxyConfig
+	PublicConfigUpdateEach  = time.Hour
+	PublicConfigUpdateURLv4 = "https://core.telegram.org/getProxyConfig"
+	PublicConfigUpdateURLv6 = "https://core.telegram.org/getProxyConfigV6"
+
+	// How often should we extract hosts from Telegram using help.getConfig
+	// method.
+	OwnConfigUpdateEach = time.Hour
+)
+
+type Logger interface {
+	Info(msg string)
+	WarningError(msg string, err error)
+}
+
+type Updater interface {
+	Run(ctx context.Context)
+}
+
+// https://github.com/telegramdesktop/tdesktop/blob/master/Telegram/SourceFiles/mtproto/mtproto_dc_options.cpp#L30
+var defaultDCAddrSet = (func() dcAddrSet {
+	addrSet := dcAddrSet{
+		v4: make(map[int][]Addr),
+		v6: make(map[int][]Addr),
+	}
+
+	for dcid, ips := range essentials.TelegramCoreAddresses {
+		for _, addr := range ips {
+			host, _, err := net.SplitHostPort(addr)
+			if err != nil {
+				panic(err)
+			}
+
+			ip := net.ParseIP(host)
+			if ip == nil {
+				panic(addr)
+			}
+			if ip.To4() == nil {
+				addrSet.v6[dcid] = append(addrSet.v6[dcid], Addr{
+					Network: "tcp6",
+					Address: addr,
+				})
+			} else {
+				addrSet.v4[dcid] = append(addrSet.v4[dcid], Addr{
+					Network: "tcp4",
+					Address: addr,
+				})
+			}
+		}
+	}
+
+	return addrSet
+})()

mtglib/internal/dc/init_test.go

@@ -0,0 +1,43 @@
+package dc
+
+import (
+	"context"
+
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/suite"
+)
+
+type LoggerMock struct {
+	mock.Mock
+}
+
+func (m *LoggerMock) Info(msg string) {
+	m.Called(msg)
+}
+
+func (m *LoggerMock) WarningError(msg string, err error) {
+	m.Called(msg, err)
+}
+
+type UpdaterTestSuiteBase struct {
+	suite.Suite
+
+	ctx        context.Context
+	ctxCancel  context.CancelFunc
+	loggerMock *LoggerMock
+}
+
+func (s *UpdaterTestSuiteBase) SetupTest() {
+	ctx, cancel := context.WithCancel(context.Background())
+
+	s.loggerMock = &LoggerMock{}
+	s.loggerMock.On("Info", mock.AnythingOfType("string"))
+	s.loggerMock.On("WarningError", mock.AnythingOfType("string"), mock.Anything)
+
+	s.ctx = ctx
+	s.ctxCancel = cancel
+}
+
+func (s *UpdaterTestSuiteBase) TearDownTest() {
+	s.ctxCancel()
+}

mtglib/internal/dc/public_config_updater.go

@@ -0,0 +1,93 @@
+package dc
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"regexp"
+	"strconv"
+)
+
+var publicConfigRe = regexp.MustCompile(`^\s*proxy_for\s+(\d+)\s+(\S+?)?;\s*$`)
+
+type PublicConfigUpdater struct {
+	updater
+
+	http *http.Client
+	tg   *Telegram
+}
+
+func (p *PublicConfigUpdater) Run(ctx context.Context, url, network string) {
+	p.run(ctx, func() error {
+		req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+		if err != nil {
+			panic(err)
+		}
+
+		resp, err := p.http.Do(req)
+		if err != nil {
+			if resp != nil {
+				io.Copy(io.Discard, resp.Body) //nolint: errcheck
+				resp.Body.Close()              //nolint: errcheck
+			}
+			return fmt.Errorf("cannot fetch url %s: %w", url, err)
+		}
+
+		if resp.StatusCode >= http.StatusBadRequest {
+			return fmt.Errorf("unexpected status code from %s: %d", url, resp.StatusCode)
+		}
+
+		scanner := bufio.NewScanner(resp.Body)
+		addrs := map[int][]Addr{}
+
+		for scanner.Scan() {
+			matches := publicConfigRe.FindStringSubmatch(scanner.Text())
+			if len(matches) != 3 {
+				continue
+			}
+
+			dc, err := strconv.Atoi(matches[1])
+			if err != nil {
+				continue
+			}
+
+			switch dc {
+			// this is a list of DC we currently support. Other are ignored.
+			case 203: // CDN DC
+				p.logger.Info(fmt.Sprintf("found %s address for DC %d", matches[2], dc))
+				addrs[dc] = append(addrs[dc], Addr{
+					Network: network,
+					Address: matches[2],
+				})
+			}
+		}
+
+		if err := scanner.Err(); err != nil {
+			return fmt.Errorf("cannot read response body from %s: %w", url, err)
+		}
+
+		p.tg.lock.Lock()
+		defer p.tg.lock.Unlock()
+
+		if network == "tcp4" {
+			p.tg.view.publicConfigs.v4 = addrs
+		} else {
+			p.tg.view.publicConfigs.v6 = addrs
+		}
+
+		return nil
+	})
+}
+
+func NewPublicConfigUpdater(tg *Telegram, logger Logger, client *http.Client) *PublicConfigUpdater {
+	return &PublicConfigUpdater{
+		updater: updater{
+			logger: logger,
+			period: PublicConfigUpdateEach,
+		},
+		http: client,
+		tg:   tg,
+	}
+}

mtglib/internal/dc/public_config_updater_test.go

@@ -0,0 +1,113 @@
+package dc
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"github.com/stretchr/testify/suite"
+)
+
+type PublicConfigUpdaterTestSuite struct {
+	UpdaterTestSuiteBase
+
+	u               *PublicConfigUpdater
+	lock            sync.Mutex
+	srv             *httptest.Server
+	responseHandler func(w http.ResponseWriter)
+}
+
+func (s *PublicConfigUpdaterTestSuite) SetupSuite() {
+	s.srv = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		s.lock.Lock()
+		s.responseHandler(w)
+		s.lock.Unlock()
+	}))
+}
+
+func (s *PublicConfigUpdaterTestSuite) TearDownSuite() {
+	s.srv.Close()
+}
+
+func (s *PublicConfigUpdaterTestSuite) SetupTest() {
+	s.UpdaterTestSuiteBase.SetupTest()
+
+	tg, err := New("prefer-ipv4")
+	require.NoError(s.T(), err)
+
+	s.u = NewPublicConfigUpdater(tg, s.loggerMock, s.srv.Client())
+}
+
+func (s *PublicConfigUpdaterTestSuite) Test502StatusCode() {
+	s.responseHandler = func(w http.ResponseWriter) {
+		w.WriteHeader(http.StatusBadGateway)
+	}
+	s.u.Run(s.ctx, s.srv.URL, "tcp4")
+
+	time.Sleep(100 * time.Millisecond)
+	s.ctxCancel()
+	s.u.Wait()
+
+	s.Len(s.u.tg.view.publicConfigs.v4, 0)
+}
+
+func (s *PublicConfigUpdaterTestSuite) TestEmptyFile() {
+	s.responseHandler = func(w http.ResponseWriter) {
+		w.WriteHeader(http.StatusOK)
+	}
+	s.u.Run(s.ctx, s.srv.URL, "tcp4")
+
+	time.Sleep(100 * time.Millisecond)
+	s.ctxCancel()
+	s.u.Wait()
+
+	s.Len(s.u.tg.view.publicConfigs.v4, 0)
+}
+
+func (s *PublicConfigUpdaterTestSuite) TestGarbage() {
+	result := `
+proxy_for -1 -1;
+proxy_for 100 100.10.0.0:3333;
+lala 0 0
+`
+
+	s.responseHandler = func(w http.ResponseWriter) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(result)) //nolint: errcheck
+	}
+	s.u.Run(s.ctx, s.srv.URL, "tcp4")
+
+	time.Sleep(100 * time.Millisecond)
+	s.ctxCancel()
+	s.u.Wait()
+
+	s.Len(s.u.tg.view.publicConfigs.v4, 0)
+}
+
+func (s *PublicConfigUpdaterTestSuite) TestOk() {
+	result := `
+proxy_for 203 100.10.0.0:3333;
+proxy_for -100 101.10.0.0:3333;
+`
+
+	s.responseHandler = func(w http.ResponseWriter) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(result)) //nolint: errcheck
+	}
+	s.u.Run(s.ctx, s.srv.URL, "tcp4")
+
+	time.Sleep(100 * time.Millisecond)
+	s.ctxCancel()
+	s.u.Wait()
+
+	s.Len(s.u.tg.view.publicConfigs.v4, 1)
+	s.Len(s.u.tg.view.publicConfigs.v4[203], 1)
+	s.Equal("100.10.0.0:3333", s.u.tg.view.publicConfigs.v4[203][0].Address)
+}
+
+func TestPublicConfigUpdater(t *testing.T) {
+	suite.Run(t, &PublicConfigUpdaterTestSuite{})
+}

mtglib/internal/dc/telegram.go

@@ -0,0 +1,50 @@
+package dc
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+)
+
+type Telegram struct {
+	lock     sync.RWMutex
+	view     dcView
+	preferIP preferIP
+}
+
+func (t *Telegram) GetAddresses(dc int) []Addr {
+	t.lock.RLock()
+	defer t.lock.RUnlock()
+
+	switch t.preferIP {
+	case preferIPOnlyIPv4:
+		return t.view.getV4(dc)
+	case preferIPOnlyIPv6:
+		return t.view.getV6(dc)
+	case preferIPPreferIPv4:
+		return append(t.view.getV4(dc), t.view.getV6(dc)...)
+	}
+
+	return append(t.view.getV6(dc), t.view.getV4(dc)...)
+}
+
+func New(ipPreference string) (*Telegram, error) {
+	var pref preferIP
+
+	switch strings.ToLower(ipPreference) {
+	case "prefer-ipv4":
+		pref = preferIPPreferIPv4
+	case "prefer-ipv6":
+		pref = preferIPPreferIPv6
+	case "only-ipv4":
+		pref = preferIPOnlyIPv4
+	case "only-ipv6":
+		pref = preferIPOnlyIPv6
+	default:
+		return nil, fmt.Errorf("unknown ip preference %s", ipPreference)
+	}
+
+	return &Telegram{
+		preferIP: pref,
+	}, nil
+}

mtglib/internal/dc/updater.go

@@ -0,0 +1,47 @@
+package dc
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+type updater struct {
+	wg     sync.WaitGroup
+	logger Logger
+	period time.Duration
+}
+
+func (u *updater) Wait() {
+	u.wg.Wait()
+}
+
+func (u *updater) run(ctx context.Context, callback func() error) {
+	u.wg.Go(func() {
+		ticker := time.NewTicker(u.period)
+
+		defer func() {
+			ticker.Stop()
+
+			select {
+			case <-ticker.C:
+			default:
+			}
+		}()
+
+		for {
+			u.logger.Info("start update")
+			if err := callback(); err != nil {
+				u.logger.WarningError("cannot update", err)
+			}
+			u.logger.Info("updated")
+
+			select {
+			case <-ctx.Done():
+				u.logger.Info("stop updating")
+				return
+			case <-ticker.C:
+			}
+		}
+	})
+}

mtglib/internal/dc/updater_test.go

@@ -0,0 +1,55 @@
+package dc
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/suite"
+)
+
+type UpdaterTestSuite struct {
+	UpdaterTestSuiteBase
+
+	u updater
+}
+
+func (s *UpdaterTestSuite) SetupTest() {
+	s.UpdaterTestSuiteBase.SetupTest()
+	s.u = updater{
+		logger: s.loggerMock,
+		period: 100 * time.Millisecond,
+	}
+}
+
+func (s *UpdaterTestSuite) TestPeriodicUpdates() {
+	ticker := time.NewTicker(10 * time.Millisecond)
+	defer ticker.Stop()
+
+	lock := &sync.Mutex{}
+	collected := []time.Time{}
+
+	go s.u.run(s.ctx, func() error {
+		select {
+		case <-s.ctx.Done():
+		case value := <-ticker.C:
+			lock.Lock()
+			collected = append(collected, value)
+			lock.Unlock()
+		}
+
+		return nil
+	})
+
+	s.Eventually(func() bool {
+		lock.Lock()
+		defer lock.Unlock()
+
+		return len(collected) == 3
+	}, time.Second, 10*time.Millisecond)
+}
+
+func TestUpdater(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &UpdaterTestSuite{})
+}

mtglib/internal/dc/view.go

@@ -0,0 +1,19 @@
+package dc
+
+type dcView struct {
+	publicConfigs dcAddrSet
+}
+
+func (d dcView) getV4(dc int) []Addr {
+	addrs := d.publicConfigs.getV4(dc)
+	addrs = append(addrs, defaultDCAddrSet.getV4(dc)...)
+
+	return addrs
+}
+
+func (d dcView) getV6(dc int) []Addr {
+	addrs := d.publicConfigs.getV6(dc)
+	addrs = append(addrs, defaultDCAddrSet.getV6(dc)...)
+
+	return addrs
+}

mtglib/internal/dc/view_test.go

@@ -0,0 +1,81 @@
+package dc
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+)
+
+type ViewTestSuite struct {
+	suite.Suite
+
+	view dcView
+}
+
+func (suite *ViewTestSuite) SetupSuite() {
+	suite.view = dcView{
+		publicConfigs: dcAddrSet{
+			v4: map[int][]Addr{
+				111: {
+					{Network: "tcp4", Address: "127.0.0.1:443"},
+				},
+				203: {
+					{Network: "tcp4", Address: "127.0.0.2:443"},
+				},
+			},
+			v6: map[int][]Addr{
+				203: {
+					{Network: "tcp6", Address: "xxx"},
+				},
+			},
+		},
+	}
+}
+
+func (suite *ViewTestSuite) TestGetV4() {
+	testData := map[int][]Addr{
+		111: {
+			{Network: "tcp4", Address: "127.0.0.1:443"},
+		},
+		203: {
+			{Network: "tcp4", Address: "127.0.0.2:443"},
+			{Network: "tcp4", Address: "91.105.192.100:443"},
+		},
+		2: {
+			{Network: "tcp4", Address: "149.154.167.51:443"},
+			{Network: "tcp4", Address: "95.161.76.100:443"},
+		},
+	}
+
+	for dc, addresses := range testData {
+		suite.T().Run(fmt.Sprintf("dc%d", dc), func(t *testing.T) {
+			assert.ElementsMatch(t, addresses, suite.view.getV4(dc))
+		})
+	}
+}
+
+func (suite *ViewTestSuite) TestGetV6() {
+	testData := map[int][]Addr{
+		111: {},
+		203: {
+			{Network: "tcp6", Address: "xxx"},
+			{Network: "tcp6", Address: "[2a0a:f280:0203:000a:5000:0000:0000:0100]:443"},
+		},
+		1: {
+			{Network: "tcp6", Address: "[2001:b28:f23d:f001::a]:443"},
+		},
+	}
+
+	for dc, addresses := range testData {
+		suite.T().Run(fmt.Sprintf("dc%d", dc), func(t *testing.T) {
+			assert.ElementsMatch(t, addresses, suite.view.getV6(dc))
+		})
+	}
+}
+
+func TestView(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &ViewTestSuite{})
+}

mtglib/internal/doppel/conn.go

@@ -0,0 +1,118 @@
+package doppel
+
+import (
+	"bytes"
+	"context"
+	"sync"
+	"time"
+
+	"github.com/9seconds/mtg/v2/essentials"
+	"github.com/9seconds/mtg/v2/mtglib/internal/tls"
+)
+
+var doppelBufPool = sync.Pool{
+	New: func() any {
+		b := make([]byte, tls.MaxRecordSize)
+		return &b
+	},
+}
+
+type Conn struct {
+	essentials.Conn
+
+	p *connPayload
+}
+
+type connPayload struct {
+	ctx         context.Context
+	ctxCancel   context.CancelCauseFunc
+	stats       Stats
+	wg          sync.WaitGroup
+	writeStream bytes.Buffer
+	writtenCond sync.Cond
+	done        bool
+}
+
+func (c Conn) Write(p []byte) (int, error) {
+	if len(p) == 0 {
+		return 0, context.Cause(c.p.ctx)
+	}
+
+	c.p.writtenCond.L.Lock()
+	c.p.writeStream.Write(p)
+	c.p.writtenCond.L.Unlock()
+
+	c.p.writtenCond.Signal()
+
+	return len(p), context.Cause(c.p.ctx)
+}
+
+func (c Conn) start() {
+	bp := doppelBufPool.Get().(*[]byte)
+	buf := *bp
+	defer doppelBufPool.Put(bp)
+
+	timer := time.NewTimer(c.p.stats.Delay())
+	defer timer.Stop()
+
+	for {
+		select {
+		case <-c.p.ctx.Done():
+			return
+		case <-timer.C:
+			timer.Reset(c.p.stats.Delay())
+		}
+
+		size := c.p.stats.Size()
+
+		c.p.writtenCond.L.Lock()
+		for c.p.writeStream.Len() == 0 && !c.p.done {
+			c.p.writtenCond.Wait()
+		}
+		n, _ := c.p.writeStream.Read(buf[tls.SizeHeader : tls.SizeHeader+size])
+		c.p.writtenCond.L.Unlock()
+
+		if n == 0 {
+			continue
+		}
+
+		if err := tls.WriteRecordInPlace(c.Conn, buf, n); err != nil {
+			c.p.ctxCancel(err)
+			return
+		}
+	}
+}
+
+func (c Conn) Stop() {
+	c.p.ctxCancel(nil)
+
+	c.p.writtenCond.L.Lock()
+	c.p.done = true
+	c.p.writtenCond.L.Unlock()
+	c.p.writtenCond.Broadcast()
+
+	c.p.wg.Wait()
+}
+
+func NewConn(ctx context.Context, conn essentials.Conn, stats Stats) Conn {
+	ctx, cancel := context.WithCancelCause(ctx)
+	rv := Conn{
+		Conn: conn,
+		p: &connPayload{
+			ctx:       ctx,
+			ctxCancel: cancel,
+			stats:     stats,
+			writtenCond: sync.Cond{
+				L: &sync.Mutex{},
+			},
+		},
+	}
+
+	rv.p.writeStream.Grow(tls.DefaultBufferSize)
+
+	rv.p.wg.Go(func() {
+		rv.start()
+	})
+
+	return rv
+}

mtglib/internal/doppel/conn_test.go

@@ -0,0 +1,194 @@
+package doppel
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"errors"
+	"io"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/9seconds/mtg/v2/internal/testlib"
+	"github.com/9seconds/mtg/v2/mtglib/internal/tls"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/suite"
+)
+
+type ConnMock struct {
+	testlib.EssentialsConnMock
+
+	mu          sync.Mutex
+	writeBuffer bytes.Buffer
+}
+
+func (m *ConnMock) Write(p []byte) (int, error) {
+	args := m.Called(p)
+	if err := args.Error(1); err != nil {
+		return args.Int(0), err
+	}
+
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	return m.writeBuffer.Write(p)
+}
+
+func (m *ConnMock) Written() []byte {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	return bytes.Clone(m.writeBuffer.Bytes())
+}
+
+type ConnTestSuite struct {
+	suite.Suite
+
+	connMock  *ConnMock
+	ctx       context.Context
+	ctxCancel context.CancelFunc
+}
+
+func (suite *ConnTestSuite) SetupTest() {
+	ctx, cancel := context.WithCancel(context.Background())
+	suite.ctx = ctx
+	suite.ctxCancel = cancel
+	suite.connMock = &ConnMock{}
+}
+
+func (suite *ConnTestSuite) TearDownTest() {
+	suite.ctxCancel()
+	suite.connMock.AssertExpectations(suite.T())
+}
+
+func (suite *ConnTestSuite) makeConn() Conn {
+	return NewConn(suite.ctx, suite.connMock, Stats{
+		k:      2.0,
+		lambda: 0.01,
+	})
+}
+
+func (suite *ConnTestSuite) TestWriteBuffersData() {
+	suite.connMock.
+		On("Write", mock.AnythingOfType("[]uint8")).
+		Return(0, nil).
+		Maybe()
+
+	c := suite.makeConn()
+	defer c.Stop()
+
+	n, err := c.Write([]byte{1, 2, 3})
+	suite.NoError(err)
+	suite.Equal(3, n)
+}
+
+func (suite *ConnTestSuite) TestWriteOutputsTLSRecords() {
+	suite.connMock.
+		On("Write", mock.AnythingOfType("[]uint8")).
+		Return(0, nil).
+		Maybe()
+
+	c := suite.makeConn()
+
+	payload := []byte("hello doppelganger")
+	_, err := c.Write(payload)
+	suite.NoError(err)
+
+	suite.Eventually(func() bool {
+		return len(suite.connMock.Written()) > 0
+	}, 2*time.Second, time.Millisecond)
+
+	c.Stop()
+
+	assembled := &bytes.Buffer{}
+	reader := bytes.NewReader(suite.connMock.Written())
+
+	for {
+		header := make([]byte, tls.SizeHeader)
+		if _, err := io.ReadFull(reader, header); err != nil {
+			break
+		}
+
+		suite.Equal(byte(tls.TypeApplicationData), header[0])
+		suite.Equal(tls.TLSVersion[:], header[tls.SizeRecordType:tls.SizeRecordType+tls.SizeVersion])
+
+		length := binary.BigEndian.Uint16(header[tls.SizeRecordType+tls.SizeVersion:])
+		suite.Greater(length, uint16(0))
+
+		rec := make([]byte, length)
+		_, err := io.ReadFull(reader, rec)
+		suite.NoError(err)
+
+		assembled.Write(rec)
+	}
+
+	suite.Equal(payload, assembled.Bytes())
+}
+
+func (suite *ConnTestSuite) TestWriteReturnsErrorAfterStop() {
+	suite.connMock.
+		On("Write", mock.AnythingOfType("[]uint8")).
+		Return(0, nil).
+		Maybe()
+
+	c := suite.makeConn()
+	c.Stop()
+
+	time.Sleep(10 * time.Millisecond)
+
+	_, err := c.Write([]byte{1})
+	suite.Error(err)
+}
+
+func (suite *ConnTestSuite) TestStopDoesNotDeadlockWhenStartIsWaiting() {
+	suite.connMock.
+		On("Write", mock.AnythingOfType("[]uint8")).
+		Return(0, nil).
+		Maybe()
+
+	for range 100 {
+		func() {
+			ctx, cancel := context.WithCancel(suite.ctx)
+			defer cancel()
+
+			c := NewConn(ctx, suite.connMock, Stats{
+				k:      2.0,
+				lambda: 0.01,
+			})
+
+			done := make(chan struct{})
+			go func() {
+				defer close(done)
+				c.Stop()
+			}()
+
+			select {
+			case <-done:
+			case <-time.After(2 * time.Second):
+				suite.Fail("Stop() deadlocked: start() likely stuck in writtenCond.Wait()")
+			}
+		}()
+	}
+}
+
+func (suite *ConnTestSuite) TestStopOnUnderlyingWriteError() {
+	suite.connMock.
+		On("Write", mock.AnythingOfType("[]uint8")).
+		Return(0, errors.New("connection reset")).
+		Maybe()
+
+	c := suite.makeConn()
+
+	_, _ = c.Write([]byte("data"))
+
+	suite.Eventually(func() bool {
+		_, err := c.Write([]byte{1})
+		return err != nil
+	}, 2*time.Second, time.Millisecond)
+}
+
+func TestConn(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &ConnTestSuite{})
+}