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

Allow using directory bind mounts for a docker container

.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

@@ -2,6 +2,18 @@
 
 name: CI
 
+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:
     tags:
@@ -26,36 +38,60 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
-    timeout-minutes: 5
-    strategy:
-      matrix:
-        go_version:
-          - ^1.16
+    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
@@ -63,69 +99,83 @@ 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: v1.39.0
+          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
 
   docker:
     name: Docker
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    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

@@ -11,6 +11,14 @@
 #
 name: "CodeQL"
 
+# https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#permissions
+# https://github.com/github/codeql-action/issues/572
+permissions:
+  actions: read
+  contents: read
+  pull-requests: read
+  security-events: write
+
 on:
   push:
     branches: 

.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

@@ -6,7 +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 = ["gochecknoglobals", "gas", "goerr113", "exhaustivestruct"]
+# [linters]
+# enable-all = true
+# disable = [
+#     "containedctx",
+#     "exhaustivestruct",
+#     "exhaustruct",
+#     "gas",
+#     "gochecknoglobals",
+#     "goerr113",
+#     "ireturn",
+#     "thelper",
+#     "varnamelen",
+# ]

.goreleaser.yml

@@ -0,0 +1,150 @@
+---
+
+version: 2
+
+project_name: mtg
+
+before:
+  hooks:
+    - go mod tidy
+    - go generate ./...
+
+builds:
+  - id: default
+    binary: '{{ .ProjectName }}'
+    goos:
+      - darwin
+      - freebsd
+      - linux
+      - netbsd
+      - openbsd
+      - windows
+    goarch:
+      - 386
+      - amd64
+      - arm
+      - arm64
+    goarm:
+      - 6
+      - 7
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -trimpath
+      - -mod=readonly
+    ldflags: -s -w -X main.version={{ .Version }}
+    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:
+  - 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
+        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:
+  version_template: '{{ .Version }}'
+
+checksum:
+  name_template: '{{ .ProjectName }}-{{ .Version }}-checksums.txt'
+
+source:
+  enabled: true
+  name_template: '{{ .ProjectName }}-sources'

.mise.toml

@@ -0,0 +1,98 @@
+[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.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:1.16-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

@@ -1,107 +0,0 @@
-ROOT_DIR     := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
-IMAGE_NAME   := mtg
-APP_NAME     := $(IMAGE_NAME)
-
-CC_BINARIES  := $(shell bash -c "echo -n $(APP_NAME)-{linux,freebsd,openbsd}-{386,amd64} $(APP_NAME)-linux-{arm,arm64}")
-
-GOLANGCI_LINT_VERSION := v1.39.0
-
-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)"
-
-$(APP_NAME)-%: GOOS=$(shell echo -n "$@" | sed 's?$(APP_NAME)-??' | cut -f1 -d-)
-$(APP_NAME)-%: GOARCH=$(shell echo -n "$@" | sed 's?$(APP_NAME)-??' | cut -f2 -d-)
-$(APP_NAME)-%: ccbuilds
-	@env "GOOS=$(GOOS)" "GOARCH=$(GOARCH)" \
-		go build \
-		$(COMMON_BUILD_FLAGS) \
-		-tags netgo \
-		-a \
-		-o "./ccbuilds/$(APP_NAME)-$(GOOS)-$(GOARCH)"
-
-.PHONY: ccbuilds
-ccbuilds:
-	@rm -rf ./ccbuilds && mkdir -p ./ccbuilds
-
-vendor: go.mod go.sum
-	@$(MOD_ON) go mod vendor
-
-.PHONY: fmt
-fmt:
-	@$(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: crosscompile
-crosscompile: $(CC_BINARIES)
-
-.PHONY: clean
-clean:
-	@git clean -xfd && \
-		git reset --hard >/dev/null && \
-		git submodule foreach --recursive sh -c 'git clean -xfd && git reset --hard' >/dev/null
-
-.PHONY: lint
-lint:
-	@$(GOTOOL) golangci-lint run
-
-.PHONY: docker
-docker:
-	@docker build --pull -t "$(IMAGE_NAME)" "$(ROOT_DIR)"
-
-.PHONY: doc
-doc:
-	@$(GOTOOL) godoc -http 0.0.0.0:10000
-
-.PHONY: install-tools
-install-tools: install-tools-lint install-tools-godoc install-tools-gofumpt
-
-.PHONY: install-tools-lint
-install-tools-lint:
-	@mkdir -p "$(GOBIN)" || true && \
-		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:
-	@mkdir -p "$(GOBIN)" || true && \
-		$(GOTOOL) go get -u golang.org/x/tools/cmd/godoc
-
-.PHONY: install-tools-gofumpt
-install-tools-gofumpt:
-	@mkdir -p "$(GOBIN)" || true && \
-		$(GOTOOL) go get -u mvdan.cc/gofumpt
-
-.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
@@ -40,6 +79,12 @@ 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
@@ -75,6 +120,8 @@ 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 +209,12 @@ 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
@@ -190,21 +243,22 @@ 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
 
 ```console
-git clone https://github.com:9seconds/mtg.git
+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 +278,16 @@ $ 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 +301,82 @@ 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
+
+mtg supports 2 modes: simple and normal. Simple mode allows starting
+proxy with a small subset of configuration options you usually want to
+modify. This is quite good for oneliners that you can copy-paste and do
+not bother about external files whatsoever.
+
+Let's take a look:
+
+```console
+Usage: mtg simple-run <bind-to> <secret>
+
+Run proxy without config file.
+
+Arguments:
+  <bind-to>    A host:port to bind proxy to.
+  <secret>     Proxy secret.
+
+Flags:
+  -h, --help                           Show context-sensitive help.
+  -v, --version                        Print version.
+
+  -d, --debug                          Run in debug mode.
+  -c, --concurrency=8192               Max number of concurrent connection to proxy.
+  -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=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.
+```
+
+So, if you want to startup a proxy with CLI only, you can do something like
+
+```console
+$ mtg simple-run -n 1.1.1.1 -t 30s -a 512kib 127.0.0.1:3128 7hBO-dCS4EBzenlKbdLFxyNnb29nbGUuY29t
+```
+
+The rest of the configuration will be taken from default values. But
+a simple run is fine if you do not have any special requirements or
+granular tuning. If you want it, please checkout the configuration
+files.
+
 ### Prepare a configuration file
 
 Please checkout an example configuration file. All options except of
@@ -263,12 +403,17 @@ 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
@@ -280,7 +425,7 @@ $ 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
@@ -309,6 +454,61 @@ $ 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
@@ -323,11 +523,12 @@ 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:
@@ -338,3 +539,4 @@ 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

@@ -0,0 +1,51 @@
+package essentials
+
+import (
+	"io"
+	"net"
+)
+
+// CloseableReader is an [io.Reader] interface that can close its reading end.
+type CloseableReader interface {
+	io.Reader
+	CloseRead() error
+}
+
+// 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
+// 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}
+}

essentials/doc.go

@@ -0,0 +1,6 @@
+// This is a minimal package that contains _essentials_ of mtglib and its
+// complimentary packages. This is mostly required to comply some interfaces
+// between mtglib and its internals to avoid circular dependencies.
+//
+// This package should contain only bare minimum and mostly technical.
+package essentials

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
@@ -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

@@ -23,15 +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.
-tcp-buffer = "4kb"
-
 # Sometimes you want to enforce mtg to use some types of
 # IP connectivity to Telegram. We have 4 modes:
 #   - prefer-ipv6:
@@ -44,9 +48,35 @@ tcp-buffer = "4kb"
 #     Only ipv4 connectivity is used
 prefer-ip = "prefer-ipv6"
 
+# 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
@@ -56,6 +86,40 @@ domain-fronting-port = 443
 # time range of this parameter.
 tolerate-time-skewness = "5s"
 
+# Telegram has a concept of DC. You can think about DC as a number of a cluster
+# with a certain purpose. Some clusters serve media, some - messages, some rule
+# channels and so on. But sometimes unknown DC number is requested by client.
+# It could be a bug or some global reconfiguration of the Telegram.
+#
+# By default, proxy rejects such requests. But it is also possible to fallback
+# this request to any DC. Telegram works in a way that any DC is able to serve
+# any request but sacrificing a latency.
+#
+# If this setting is disabled (default), mtg will reject a connection.
+# 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
@@ -69,8 +133,43 @@ tolerate-time-skewness = "5s"
 # 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
@@ -85,25 +184,13 @@ 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
@@ -119,6 +206,66 @@ 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.
 #
@@ -155,12 +302,33 @@ 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.
 update-each = "24h"
 
+# Allowlist is an opposite to a blocklist. Only those IPs that are coming from
+# subnets defined in these lists are allowed. All others will be rejected.
+#
+# If this feature is disabled, then there won't be any check performed by this
+# validator. It is possible to combine both blocklist and whitelist.
+[defense.allowlist]
+# You can enable/disable this feature.
+enabled = false
+# This is a limiter for concurrency. In order to protect website
+# from overloading, we download files in this number of threads.
+download-concurrency = 2
+# A list of URLs in FireHOL format (https://iplists.firehol.org/)
+# 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",
+    # "/local.file"
+
+]
+update-each = "24h"
+
 # statsd statistics integration.
 [stats.statsd]
 # enabled/disabled

go.mod

@@ -1,31 +1,57 @@
 module github.com/9seconds/mtg/v2
 
-go 1.16
+go 1.26
 
 require (
 	github.com/OneOfOne/xxhash v1.2.8
-	github.com/alecthomas/kong v0.2.16
-	github.com/alecthomas/units v0.0.0-20210208195552-ff826a37aa15
+	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 v0.0.0-20201202224819-f9447a6e25f1
-	github.com/libp2p/go-reuseport v0.0.2
 	github.com/mccutchen/go-httpbin v1.1.1
-	github.com/panjf2000/ants/v2 v2.4.4
-	github.com/pelletier/go-toml v1.9.0
-	github.com/prometheus/client_golang v1.10.0
-	github.com/prometheus/common v0.23.0 // indirect
-	github.com/rs/zerolog v1.21.0
-	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
-	github.com/xeipuuv/gojsonschema v1.2.0
-	golang.org/x/crypto v0.0.0-20210503195802-e9a32991a82e
-	golang.org/x/net v0.0.0-20210505024714-0287a6fb4125
-	golang.org/x/sys v0.0.0-20210503173754-0981d6026fa6
+	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 v1.34.0
+	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/beevik/ntp v1.5.0
+	github.com/ncruces/go-dns v1.3.2
+	github.com/pelletier/go-toml/v2 v2.2.4
+	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/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // 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/pmezard/go-difflib v1.0.0 // 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

@@ -1,536 +1,164 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
 github.com/OneOfOne/xxhash v1.2.8 h1:31czK/TI9sNkxIKfaUfGlU47BAxQ0ztGgd9vPyqimf8=
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-github.com/PuerkitoBio/goquery v1.6.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
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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=
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 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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internal/cli/access.go

@@ -1,17 +1,16 @@
 package cli
 
 import (
-	"context"
 	"encoding/json"
 	"fmt"
-	"io"
 	"net"
-	"net/http"
 	"net/url"
 	"os"
 	"strconv"
-	"strings"
 	"sync"
+
+	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/9seconds/mtg/v2/internal/utils"
 )
 
 type accessResponse struct {
@@ -26,66 +25,61 @@ type accessResponse struct {
 type accessResponseURLs struct {
 	IP        net.IP `json:"ip"`
 	Port      uint   `json:"port"`
-	TgURL     string `json:"tg_url"`
-	TgQrCode  string `json:"tg_qrcode"`
-	TmeURL    string `json:"tme_url"`
-	TmeQrCode string `json:"tme_qrcode"`
+	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 {
-	base
-
-	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'"`
 }
 
-func (c *Access) Run(cli *CLI, version string) error {
-	if err := c.ReadConfig(version); err != nil {
+func (a *Access) Run(cli *CLI, version string) error {
+	conf, err := utils.ReadConfig(a.ConfigPath)
+	if err != nil {
 		return fmt.Errorf("cannot init config: %w", err)
 	}
 
-	return c.Execute(cli)
-}
-
-func (c *Access) Execute(cli *CLI) error {
 	resp := &accessResponse{}
-	resp.Secret.Base64 = c.Config.Secret.Base64()
-	resp.Secret.Hex = c.Config.Secret.Hex()
+	resp.Secret.Base64 = conf.Secret.Base64()
+	resp.Secret.Hex = conf.Secret.Hex()
+
+	ntw, err := makeNetwork(conf, version)
+	if err != nil {
+		return fmt.Errorf("cannot init network: %w", err)
+	}
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2) // nolint: gomnd
 
-	go func() {
-		defer wg.Done()
-
-		ip := cli.Access.PublicIPv4
+	wg.Go(func() {
+		ip := a.PublicIPv4
 		if ip == nil {
-			ip = c.getIP("tcp4")
+			ip = getIP(ntw, "tcp4")
 		}
 
 		if ip != nil {
 			ip = ip.To4()
 		}
 
-		resp.IPv4 = c.makeURLs(ip, cli)
-	}()
-
-	go func() {
-		defer wg.Done()
-
-		ip := cli.Access.PublicIPv6
+		resp.IPv4 = a.makeURLs(conf, ip)
+	})
+	wg.Go(func() {
+		ip := a.PublicIPv6
 		if ip == nil {
-			ip = c.getIP("tcp6")
+			ip = getIP(ntw, "tcp6")
 		}
 
 		if ip != nil {
 			ip = ip.To16()
 		}
 
-		resp.IPv6 = c.makeURLs(ip, cli)
-	}()
+		resp.IPv6 = a.makeURLs(conf, ip)
+	})
 
 	wg.Wait()
 
@@ -100,58 +94,24 @@ func (c *Access) Execute(cli *CLI) error {
 	return nil
 }
 
-func (c *Access) getIP(protocol string) net.IP {
-	client := c.Network.MakeHTTPClient(func(ctx context.Context, network, address string) (net.Conn, error) {
-		return c.Network.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 (c *Access) makeURLs(ip net.IP, cli *CLI) *accessResponseURLs {
+func (a *Access) makeURLs(conf *config.Config, ip net.IP) *accessResponseURLs {
 	if ip == nil {
 		return nil
 	}
 
-	portNo := cli.Access.Port
+	portNo := a.Port
 	if portNo == 0 {
-		portNo = c.Config.BindTo.PortValue(0)
+		portNo = conf.BindTo.Port
 	}
 
 	values := url.Values{}
 	values.Set("server", ip.String())
 	values.Set("port", strconv.Itoa(int(portNo)))
 
-	if cli.Access.Hex {
-		values.Set("secret", c.Config.Secret.Hex())
+	if a.Hex {
+		values.Set("secret", conf.Secret.Hex())
 	} else {
-		values.Set("secret", c.Config.Secret.Base64())
+		values.Set("secret", conf.Secret.Base64())
 	}
 
 	urlQuery := values.Encode()
@@ -171,22 +131,8 @@ func (c *Access) makeURLs(ip net.IP, cli *CLI) *accessResponseURLs {
 			RawQuery: urlQuery,
 		}).String(),
 	}
-	rv.TgQrCode = c.makeQRCode(rv.TgURL)
-	rv.TmeQrCode = c.makeQRCode(rv.TmeURL)
+	rv.TgQrCode = utils.MakeQRCodeURL(rv.TgURL)
+	rv.TmeQrCode = utils.MakeQRCodeURL(rv.TmeURL)
 
 	return rv
 }
-
-func (c *Access) makeQRCode(data string) string {
-	values := url.Values{}
-	values.Set("qzone", "4")
-	values.Set("format", "svg")
-	values.Set("data", data)
-
-	return (&url.URL{
-		Scheme:   "https",
-		Host:     "api.qrserver.com",
-		Path:     "v1/create-qr-code",
-		RawQuery: values.Encode(),
-	}).String()
-}

internal/cli/access_test.go

@@ -1,197 +0,0 @@
-package cli_test
-
-import (
-	"net"
-	"net/http"
-	"testing"
-
-	"github.com/9seconds/mtg/v2/internal/config"
-	"github.com/9seconds/mtg/v2/internal/testlib"
-	"github.com/9seconds/mtg/v2/mtglib"
-	"github.com/jarcoal/httpmock"
-	"github.com/stretchr/testify/suite"
-	"github.com/xeipuuv/gojsonschema"
-)
-
-var accressResponseJSONSchema = func() *gojsonschema.Schema {
-	schema, err := gojsonschema.NewSchema(gojsonschema.NewStringLoader(`
-{
-    "type": "object",
-    "required": ["secret"],
-    "additionalProperties": true,
-    "properties": {
-        "secret": {
-            "type": "object",
-            "required": [
-                "hex",
-                "base64"
-            ],
-            "additionalProperties": false,
-            "properties": {
-                "hex": {
-                    "type": "string",
-                    "minLength": 34
-                },
-                "base64": {
-                    "type": "string",
-                    "minLength": 10
-                }
-            }
-        },
-        "ipv4": {
-            "$ref": "#/definitions/ip"
-        },
-        "ipv6": {
-            "$ref": "#/definitions/ip"
-        }
-    },
-    "definitions": {
-        "ip": {
-            "type": "object",
-            "required": [
-                "ip",
-                "port",
-                "tg_url",
-                "tg_qrcode",
-                "tme_url",
-                "tme_qrcode"
-            ],
-            "additionalProperties": false,
-            "properties": {
-                "ip": {
-                    "type": "string",
-                    "minLength": 1,
-                    "anyOf": [
-                        {
-                            "format": "ipv4"
-                        },
-                        {
-                            "format": "ipv6"
-                        }
-                    ]
-                },
-                "port": {
-                    "type": "integer",
-                    "multipleOf": 1.0,
-                    "exclusiveMinimum": 0,
-                    "exclusiveMaximum": 65536
-                },
-                "tg_url": {
-                    "type": "string",
-                    "minLength": 1,
-                    "format": "uri"
-                },
-                "tg_qrcode": {
-                    "type": "string",
-                    "minLength": 1,
-                    "format": "uri"
-                },
-                "tme_url": {
-                    "type": "string",
-                    "minLength": 1,
-                    "format": "uri"
-                },
-                "tme_qrcode": {
-                    "type": "string",
-                    "minLength": 1,
-                    "format": "uri"
-                }
-            }
-        }
-    }
-}
-    `))
-	if err != nil {
-		panic(err)
-	}
-
-	return schema
-}()
-
-type AccessTestSuite struct {
-	CommonTestSuite
-}
-
-func (suite *AccessTestSuite) SetupTest() {
-	suite.CommonTestSuite.SetupTest()
-
-	suite.cli.Access.Config = &config.Config{}
-	suite.cli.Access.Config.Secret = mtglib.GenerateSecret("google.com")
-	suite.cli.Access.Network = suite.networkMock
-
-	suite.NoError(
-		suite.cli.Access.Config.BindTo.UnmarshalText([]byte("0.0.0.0:80")))
-}
-
-func (suite *AccessTestSuite) TestGenerateNoCalls() {
-	suite.cli.Access.PublicIPv4 = net.ParseIP("10.0.0.10")
-	suite.cli.Access.PublicIPv6 = net.ParseIP("2001:0db8:85a3:0000:0000:8a2e:0370:7334")
-
-	output := testlib.CaptureStdout(func() {
-		suite.NoError(suite.cli.Access.Execute(suite.cli))
-	})
-
-	validated, err := accressResponseJSONSchema.Validate(
-		gojsonschema.NewStringLoader(output))
-	suite.NoError(err)
-	suite.Empty(validated.Errors())
-	suite.True(validated.Valid())
-
-	suite.Contains(output, "10.0.0.10")
-	suite.Contains(output, "2001:db8:85a3::8a2e:370:7334")
-	suite.Contains(output, "ipv4")
-	suite.Contains(output, "ipv6")
-	suite.Contains(output, suite.cli.Access.Config.Secret.Base64())
-	suite.Contains(output, suite.cli.Access.Config.Secret.Hex())
-}
-
-func (suite *AccessTestSuite) TestGenerateIPv4Call() {
-	suite.cli.Access.PublicIPv6 = net.ParseIP("2001:0db8:85a3:0000:0000:8a2e:0370:7334")
-
-	httpmock.RegisterResponder(http.MethodGet, "https://ifconfig.co",
-		httpmock.NewStringResponder(http.StatusOK, "10.11.12.13"))
-
-	output := testlib.CaptureStdout(func() {
-		suite.NoError(suite.cli.Access.Execute(suite.cli))
-	})
-
-	validated, err := accressResponseJSONSchema.Validate(
-		gojsonschema.NewStringLoader(output))
-	suite.NoError(err)
-	suite.Empty(validated.Errors())
-	suite.True(validated.Valid())
-
-	suite.Contains(output, "10.11.12.13")
-	suite.Contains(output, "2001:db8:85a3::8a2e:370:7334")
-	suite.Contains(output, "ipv4")
-	suite.Contains(output, "ipv6")
-	suite.Contains(output, suite.cli.Access.Config.Secret.Base64())
-	suite.Contains(output, suite.cli.Access.Config.Secret.Hex())
-}
-
-func (suite *AccessTestSuite) TestIPv4CallFail() {
-	suite.cli.Access.PublicIPv6 = net.ParseIP("2001:0db8:85a3:0000:0000:8a2e:0370:7334")
-
-	httpmock.RegisterResponder(http.MethodGet, "https://ifconfig.co",
-		httpmock.NewStringResponder(http.StatusForbidden, ""))
-
-	output := testlib.CaptureStdout(func() {
-		suite.NoError(suite.cli.Access.Execute(suite.cli))
-	})
-
-	validated, err := accressResponseJSONSchema.Validate(
-		gojsonschema.NewStringLoader(output))
-	suite.NoError(err)
-	suite.Empty(validated.Errors())
-	suite.True(validated.Valid())
-
-	suite.Contains(output, "2001:db8:85a3::8a2e:370:7334")
-	suite.NotContains(output, "ipv4")
-	suite.Contains(output, "ipv6")
-	suite.Contains(output, suite.cli.Access.Config.Secret.Base64())
-	suite.Contains(output, suite.cli.Access.Config.Secret.Hex())
-}
-
-func TestAccess(t *testing.T) { // nolint: paralleltest
-	suite.Run(t, &AccessTestSuite{})
-}

internal/cli/base.go

@@ -1,81 +0,0 @@
-package cli
-
-import (
-	"fmt"
-	"net"
-	"net/url"
-	"os"
-
-	"github.com/9seconds/mtg/v2/internal/config"
-	"github.com/9seconds/mtg/v2/mtglib"
-	"github.com/9seconds/mtg/v2/network"
-)
-
-type base struct {
-	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"` // nolint: lll
-
-	Network mtglib.Network `kong:"-"`
-	Config  *config.Config `kong:"-"`
-}
-
-func (b *base) ReadConfig(version string) error {
-	content, err := os.ReadFile(b.ConfigPath)
-	if err != nil {
-		return fmt.Errorf("cannot read config file: %w", err)
-	}
-
-	conf, err := config.Parse(content)
-	if err != nil {
-		return fmt.Errorf("cannot parse config: %w", err)
-	}
-
-	ntw, err := b.makeNetwork(conf, version)
-	if err != nil {
-		return fmt.Errorf("cannot build a network: %w", err)
-	}
-
-	b.Config = conf
-	b.Network = ntw
-
-	return nil
-}
-
-func (b *base) makeNetwork(conf *config.Config, version string) (mtglib.Network, error) {
-	tcpTimeout := conf.Network.Timeout.TCP.Value(network.DefaultTimeout)
-	httpTimeout := conf.Network.Timeout.HTTP.Value(network.DefaultHTTPTimeout)
-	dohIP := conf.Network.DOHIP.Value(net.ParseIP(network.DefaultDOHHostname)).String()
-	bufferSize := conf.TCPBuffer.Value(network.DefaultBufferSize)
-	userAgent := "mtg/" + version
-
-	baseDialer, err := network.NewDefaultDialer(tcpTimeout, int(bufferSize))
-	if err != nil {
-		return nil, fmt.Errorf("cannot build a default dialer: %w", err)
-	}
-
-	proxyURLs := make([]*url.URL, 0, len(conf.Network.Proxies))
-
-	for _, v := range conf.Network.Proxies {
-		if value := v.Value(nil); value != nil {
-			proxyURLs = append(proxyURLs, v.Value(nil))
-		}
-	}
-
-	switch len(proxyURLs) {
-	case 0:
-		return network.NewNetwork(baseDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
-	case 1:
-		socksDialer, err := network.NewSocks5Dialer(baseDialer, proxyURLs[0])
-		if err != nil {
-			return nil, fmt.Errorf("cannot build socks5 dialer: %w", err)
-		}
-
-		return network.NewNetwork(socksDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
-	}
-
-	socksDialer, err := network.NewLoadBalancedSocks5Dialer(baseDialer, proxyURLs)
-	if err != nil {
-		return nil, fmt.Errorf("cannot build socks5 dialer: %w", err)
-	}
-
-	return network.NewNetwork(socksDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
-}

internal/cli/base_internal_test.go

@@ -1,33 +0,0 @@
-package cli
-
-import (
-	"path/filepath"
-	"testing"
-
-	"github.com/stretchr/testify/suite"
-)
-
-type BaseTestSuite struct {
-	suite.Suite
-
-	b base
-}
-
-func (suite *BaseTestSuite) SetupTest() {
-	suite.b = base{}
-}
-
-func (suite *BaseTestSuite) TestReadConfigNok() {
-	suite.b.ConfigPath = filepath.Join("testdata", "unknown")
-	suite.Error(suite.b.ReadConfig("dev"))
-}
-
-func (suite *BaseTestSuite) TestReadConfig() {
-	suite.b.ConfigPath = filepath.Join("testdata", "minimal.toml")
-	suite.NoError(suite.b.ReadConfig("dev"))
-}
-
-func TestBase(t *testing.T) {
-	t.Parallel()
-	suite.Run(t, &BaseTestSuite{})
-}

internal/cli/cli.go

@@ -4,7 +4,9 @@ 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            Proxy            `kong:"cmd,help='Run proxy.'"`
+	Run            Run              `kong:"cmd,help='Run proxy.'"`
+	SimpleRun      SimpleRun        `kong:"cmd,help='Run proxy without config file.'"`
 	Version        kong.VersionFlag `kong:"help='Print version.',short='v'"`
 }

internal/cli/doctor.go

@@ -0,0 +1,368 @@
+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 := getIP(ntw, "tcp4")
+	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("ifconfig.co is unreachable for both IPv4 and IPv6"),
+		})
+		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

@@ -11,13 +11,13 @@ type GenerateSecret struct {
 	Hex      bool   `kong:"help='Print secret in hex encoding.',short='x'"`
 }
 
-func (c *GenerateSecret) Run(cli *CLI, _ string) error {
+func (g *GenerateSecret) Run(cli *CLI, _ string) error {
 	secret := mtglib.GenerateSecret(cli.GenerateSecret.HostName)
 
-	if cli.GenerateSecret.Hex {
-		fmt.Println(secret.Hex()) // nolint: forbidigo
+	if g.Hex {
+		fmt.Println(secret.Hex()) //nolint: forbidigo
 	} else {
-		fmt.Println(secret.Base64()) // nolint: forbidigo
+		fmt.Println(secret.Base64()) //nolint: forbidigo
 	}
 
 	return nil

internal/cli/generate_secret_test.go

@@ -1,51 +0,0 @@
-package cli_test
-
-import (
-	"strings"
-	"testing"
-
-	"github.com/9seconds/mtg/v2/internal/testlib"
-	"github.com/9seconds/mtg/v2/mtglib"
-	"github.com/stretchr/testify/suite"
-)
-
-type GenerateSecretTestSuite struct {
-	CommonTestSuite
-}
-
-func (suite *GenerateSecretTestSuite) SetupTest() {
-	suite.CommonTestSuite.SetupTest()
-
-	suite.cli.GenerateSecret.HostName = "google.com"
-}
-
-func (suite *GenerateSecretTestSuite) TestDefault() {
-	output := testlib.CaptureStdout(func() {
-		suite.NoError(suite.cli.GenerateSecret.Run(suite.cli, "dev"))
-	})
-	suite.True(strings.HasPrefix(output, "7"))
-
-	secret, err := mtglib.ParseSecret(output)
-	suite.NoError(err)
-	suite.True(secret.Valid())
-	suite.Equal("google.com", secret.Host)
-}
-
-func (suite *GenerateSecretTestSuite) TestHex() {
-	suite.cli.GenerateSecret.Hex = true
-
-	output := testlib.CaptureStdout(func() {
-		suite.NoError(suite.cli.GenerateSecret.Run(suite.cli, "dev"))
-	})
-	suite.True(strings.HasPrefix(output, "ee"))
-
-	secret, err := mtglib.ParseSecret(output)
-	suite.NoError(err)
-	suite.True(secret.Valid())
-	suite.Equal("google.com", secret.Host)
-}
-
-func TestGenerateSecret(t *testing.T) {
-	t.Parallel()
-	suite.Run(t, &GenerateSecretTestSuite{})
-}

internal/cli/init_test.go

@@ -1,37 +0,0 @@
-package cli_test
-
-import (
-	"net/http"
-
-	"github.com/9seconds/mtg/v2/internal/cli"
-	"github.com/9seconds/mtg/v2/internal/testlib"
-	"github.com/jarcoal/httpmock"
-	"github.com/stretchr/testify/mock"
-	"github.com/stretchr/testify/suite"
-)
-
-type CommonTestSuite struct {
-	suite.Suite
-
-	cli         *cli.CLI
-	networkMock *testlib.MtglibNetworkMock
-	httpClient  *http.Client
-}
-
-func (suite *CommonTestSuite) SetupTest() {
-	suite.networkMock = &testlib.MtglibNetworkMock{}
-	suite.httpClient = &http.Client{}
-	suite.cli = &cli.CLI{}
-
-	httpmock.ActivateNonDefault(suite.httpClient)
-
-	suite.networkMock.
-		On("MakeHTTPClient", mock.Anything).
-		Maybe().
-		Return(suite.httpClient)
-}
-
-func (suite *CommonTestSuite) TearDownTest() {
-	suite.networkMock.AssertExpectations(suite.T())
-	httpmock.DeactivateAndReset()
-}

internal/cli/proxy.go

@@ -1,167 +0,0 @@
-package cli
-
-import (
-	"fmt"
-	"net"
-	"os"
-
-	"github.com/9seconds/mtg/v2/antireplay"
-	"github.com/9seconds/mtg/v2/events"
-	"github.com/9seconds/mtg/v2/internal/utils"
-	"github.com/9seconds/mtg/v2/ipblocklist"
-	"github.com/9seconds/mtg/v2/logger"
-	"github.com/9seconds/mtg/v2/mtglib"
-	"github.com/9seconds/mtg/v2/stats"
-	"github.com/rs/zerolog"
-)
-
-type Proxy struct {
-	base
-}
-
-func (c *Proxy) Run(cli *CLI, version string) error {
-	if err := c.ReadConfig(version); err != nil {
-		return fmt.Errorf("cannot init config: %w", err)
-	}
-
-	return c.Execute()
-}
-
-func (c *Proxy) Execute() error {
-	zerolog.TimeFieldFormat = zerolog.TimeFormatUnixMs
-	zerolog.TimestampFieldName = "timestamp"
-	zerolog.LevelFieldName = "level"
-
-	if c.Config.Debug {
-		zerolog.SetGlobalLevel(zerolog.DebugLevel)
-	} else {
-		zerolog.SetGlobalLevel(zerolog.WarnLevel)
-	}
-
-	ctx := utils.RootContext()
-	opts := mtglib.ProxyOpts{
-		Logger:          logger.NewZeroLogger(zerolog.New(os.Stdout).With().Timestamp().Logger()),
-		Network:         c.Network,
-		AntiReplayCache: antireplay.NewNoop(),
-		IPBlocklist:     ipblocklist.NewNoop(),
-		EventStream:     events.NewNoopStream(),
-
-		Secret:             c.Config.Secret,
-		BufferSize:         c.Config.TCPBuffer.Value(mtglib.DefaultBufferSize),
-		DomainFrontingPort: c.Config.DomainFrontingPort.Value(mtglib.DefaultDomainFrontingPort),
-		IdleTimeout:        c.Config.Network.Timeout.Idle.Value(mtglib.DefaultIdleTimeout),
-		PreferIP:           c.Config.PreferIP.Value(mtglib.DefaultPreferIP),
-	}
-
-	opts.Logger.BindStr("configuration", c.Config.String()).Debug("configuration")
-
-	c.setupAntiReplayCache(&opts)
-
-	if err := c.setupIPBlocklist(&opts); err != nil {
-		return fmt.Errorf("cannot setup ipblocklist: %w", err)
-	}
-
-	if err := c.setupEventStream(&opts); err != nil {
-		return fmt.Errorf("cannot setup event stream: %w", err)
-	}
-
-	proxy, err := mtglib.NewProxy(opts)
-	if err != nil {
-		return fmt.Errorf("cannot create a proxy: %w", err)
-	}
-
-	listener, err := net.Listen("tcp", c.Config.BindTo.String())
-	if err != nil {
-		return fmt.Errorf("cannot start proxy: %w", err)
-	}
-
-	go proxy.Serve(listener) // nolint: errcheck
-
-	<-ctx.Done()
-	listener.Close()
-	proxy.Shutdown()
-
-	return nil
-}
-
-func (c *Proxy) setupAntiReplayCache(opts *mtglib.ProxyOpts) {
-	if !c.Config.Defense.AntiReplay.Enabled {
-		return
-	}
-
-	opts.AntiReplayCache = antireplay.NewStableBloomFilter(
-		c.Config.Defense.AntiReplay.MaxSize.Value(antireplay.DefaultStableBloomFilterMaxSize),
-		c.Config.Defense.AntiReplay.ErrorRate.Value(antireplay.DefaultStableBloomFilterErrorRate),
-	)
-}
-
-func (c *Proxy) setupIPBlocklist(opts *mtglib.ProxyOpts) error {
-	if !c.Config.Defense.Blocklist.Enabled {
-		return nil
-	}
-
-	remoteURLs := []string{}
-	localFiles := []string{}
-
-	for _, v := range c.Config.Defense.Blocklist.URLs {
-		if v.IsRemote() {
-			remoteURLs = append(remoteURLs, v.String())
-		} else {
-			localFiles = append(localFiles, v.String())
-		}
-	}
-
-	firehol, err := ipblocklist.NewFirehol(opts.Logger.Named("ipblockist"),
-		c.Network,
-		c.Config.Defense.Blocklist.DownloadConcurrency,
-		remoteURLs,
-		localFiles)
-	if err != nil {
-		return err // nolint: wrapcheck
-	}
-
-	go firehol.Run(c.Config.Defense.Blocklist.UpdateEach.Value(ipblocklist.DefaultFireholUpdateEach))
-
-	opts.IPBlocklist = firehol
-
-	return nil
-}
-
-func (c *Proxy) setupEventStream(opts *mtglib.ProxyOpts) error {
-	factories := make([]events.ObserverFactory, 0, 2)
-
-	if c.Config.Stats.StatsD.Enabled {
-		statsdFactory, err := stats.NewStatsd(
-			c.Config.Stats.StatsD.Address.String(),
-			opts.Logger.Named("statsd"),
-			c.Config.Stats.StatsD.MetricPrefix.Value(stats.DefaultStatsdMetricPrefix),
-			c.Config.Stats.StatsD.TagFormat.Value(stats.DefaultStatsdTagFormat))
-		if err != nil {
-			return fmt.Errorf("cannot build statsd observer: %w", err)
-		}
-
-		factories = append(factories, statsdFactory.Make)
-	}
-
-	if c.Config.Stats.Prometheus.Enabled {
-		prometheus := stats.NewPrometheus(
-			c.Config.Stats.Prometheus.MetricPrefix.Value(stats.DefaultMetricPrefix),
-			c.Config.Stats.Prometheus.HTTPPath.Value("/"),
-		)
-
-		listener, err := net.Listen("tcp", c.Config.Stats.Prometheus.BindTo.String())
-		if err != nil {
-			return fmt.Errorf("cannot start a listener for prometheus: %w", err)
-		}
-
-		go prometheus.Serve(listener) // nolint: errcheck
-
-		factories = append(factories, prometheus.Make)
-	}
-
-	if len(factories) > 0 {
-		opts.EventStream = events.NewEventStream(factories)
-	}
-
-	return nil
-}

internal/cli/run.go

@@ -0,0 +1,20 @@
+package cli
+
+import (
+	"fmt"
+
+	"github.com/9seconds/mtg/v2/internal/utils"
+)
+
+type Run struct {
+	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 {
+	conf, err := utils.ReadConfig(r.ConfigPath)
+	if err != nil {
+		return fmt.Errorf("cannot init config: %w", err)
+	}
+
+	return runProxy(conf, version)
+}

internal/cli/run_proxy.go

@@ -0,0 +1,299 @@
+package cli
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+
+	"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/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 {
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnixMs
+	zerolog.TimestampFieldName = "timestamp"
+	zerolog.LevelFieldName = "level"
+
+	if conf.Debug.Get(false) {
+		zerolog.SetGlobalLevel(zerolog.DebugLevel)
+	} else {
+		zerolog.SetGlobalLevel(zerolog.WarnLevel)
+	}
+
+	baseLogger := zerolog.New(os.Stdout).With().Timestamp().Logger()
+
+	return logger.NewZeroLogger(baseLogger)
+}
+
+func makeNetwork(conf *config.Config, version string) (mtglib.Network, error) {
+	resolver, err := network.GetDNS(conf.GetDNS())
+	if err != nil {
+		return nil, fmt.Errorf("cannot create DNS resolver: %w", err)
+	}
+
+	base := network.New(
+		resolver,
+		"",
+		conf.Network.Timeout.TCP.Get(0),
+		conf.Network.Timeout.HTTP.Get(0),
+		conf.Network.Timeout.Idle.Get(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 use %v for proxy url: %w", v.Get(nil), err)
+		}
+		proxyDialers[idx] = value
+	}
+
+	switch len(proxyDialers) {
+	case 0:
+		return base, nil
+	case 1:
+		return proxyDialers[0], nil
+	}
+
+	value, err := network.Join(proxyDialers...)
+	if err != nil {
+		panic(err)
+	}
+
+	return value, nil
+}
+
+func makeAntiReplayCache(conf *config.Config) mtglib.AntiReplayCache {
+	if !conf.Defense.AntiReplay.Enabled.Get(false) {
+		return antireplay.NewNoop()
+	}
+
+	return antireplay.NewStableBloomFilter(
+		conf.Defense.AntiReplay.MaxSize.Get(antireplay.DefaultStableBloomFilterMaxSize),
+		conf.Defense.AntiReplay.ErrorRate.Get(antireplay.DefaultStableBloomFilterErrorRate),
+	)
+}
+
+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
+	}
+
+	remoteURLs := []string{}
+	localFiles := []string{}
+
+	for _, v := range conf.URLs {
+		if v.IsRemote() {
+			remoteURLs = append(remoteURLs, v.String())
+		} else {
+			localFiles = append(localFiles, v.String())
+		}
+	}
+
+	blocklist, err := ipblocklist.NewFirehol(logger.Named("ipblockist"),
+		ntw,
+		conf.DownloadConcurrency.Get(1),
+		remoteURLs,
+		localFiles,
+		updateCallback)
+	if err != nil {
+		return nil, fmt.Errorf("incorrect parameters for firehol: %w", err)
+	}
+
+	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)
+
+	if conf.Stats.StatsD.Enabled.Get(false) {
+		statsdFactory, err := stats.NewStatsd(
+			conf.Stats.StatsD.Address.Get(""),
+			logger.Named("statsd"),
+			conf.Stats.StatsD.MetricPrefix.Get(stats.DefaultStatsdMetricPrefix),
+			conf.Stats.StatsD.TagFormat.Get(stats.DefaultStatsdTagFormat))
+		if err != nil {
+			return nil, fmt.Errorf("cannot build statsd observer: %w", err)
+		}
+
+		factories = append(factories, statsdFactory.Make)
+	}
+
+	if conf.Stats.Prometheus.Enabled.Get(false) {
+		prometheus := stats.NewPrometheus(
+			conf.Stats.Prometheus.MetricPrefix.Get(stats.DefaultMetricPrefix),
+			conf.Stats.Prometheus.HTTPPath.Get("/"),
+		)
+
+		listener, err := net.Listen("tcp", conf.Stats.Prometheus.BindTo.Get(""))
+		if err != nil {
+			return nil, fmt.Errorf("cannot start a listener for prometheus: %w", err)
+		}
+
+		go prometheus.Serve(listener) //nolint: errcheck
+
+		factories = append(factories, prometheus.Make)
+	}
+
+	if len(factories) > 0 {
+		return events.NewEventStream(factories), nil
+	}
+
+	return events.NewNoopStream(), nil
+}
+
+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.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)
+	}
+
+	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)
+	}
+
+	doppelGangerURLs := make([]string, len(conf.Defense.Doppelganger.URLs))
+	for i, v := range conf.Defense.Doppelganger.URLs {
+		doppelGangerURLs[i] = v.String()
+	}
+
+	opts := mtglib.ProxyOpts{
+		Logger:          logger,
+		Network:         ntw,
+		AntiReplayCache: makeAntiReplayCache(conf),
+		IPBlocklist:     blocklist,
+		IPAllowlist:     allowlist,
+		EventStream:     eventStream,
+
+		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,
+
+		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)
+	if err != nil {
+		return fmt.Errorf("cannot create a proxy: %w", err)
+	}
+
+	listener, err := utils.NewListener(conf.BindTo.Get(""), 0)
+	if err != nil {
+		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
+
+	<-ctx.Done()
+	listener.Close() //nolint: errcheck
+	proxy.Shutdown()
+
+	return nil
+}

internal/cli/simple_run.go

@@ -0,0 +1,96 @@
+package cli
+
+import (
+	"fmt"
+	"net"
+	"strconv"
+	"time"
+
+	"github.com/9seconds/mtg/v2/internal/config"
+)
+
+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
+	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,funlen
+	conf := &config.Config{}
+
+	if err := conf.BindTo.Set(s.BindTo); err != nil {
+		return fmt.Errorf("incorrect bind-to parameter: %w", err)
+	}
+
+	if err := conf.Secret.Set(s.Secret); err != nil {
+		return fmt.Errorf("incorrect secret: %w", err)
+	}
+
+	if err := conf.Concurrency.Set(strconv.FormatUint(s.Concurrency, 10)); err != nil {
+		return fmt.Errorf("incorrect concurrency: %w", err)
+	}
+
+	if err := conf.PreferIP.Set(s.PreferIP); err != nil {
+		return fmt.Errorf("incorrect prefer-ip: %w", err)
+	}
+
+	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)
+	}
+
+	if err := conf.Network.Timeout.TCP.Set(s.Timeout.String()); err != nil {
+		return fmt.Errorf("incorrect timeout: %w", err)
+	}
+
+	if err := conf.Network.Timeout.HTTP.Set(s.Timeout.String()); err != nil {
+		return fmt.Errorf("incorrect timeout: %w", err)
+	}
+
+	if err := conf.Network.Timeout.Idle.Set(s.Timeout.String()); err != nil {
+		return fmt.Errorf("incorrect timeout: %w", err)
+	}
+
+	if err := conf.Defense.AntiReplay.MaxSize.Set(s.AntiReplayCacheSize); err != nil {
+		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
+
+	if err := conf.Validate(); err != nil {
+		return fmt.Errorf("invalid result configuration: %w", err)
+	}
+
+	return runProxy(conf, version)
+}

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

@@ -4,32 +4,57 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"net"
+	"net/url"
 
 	"github.com/9seconds/mtg/v2/mtglib"
-	"github.com/pelletier/go-toml"
 )
 
+type Optional struct {
+	Enabled TypeBool `json:"enabled"`
+}
+
+type ListConfig struct {
+	Optional
+
+	DownloadConcurrency TypeConcurrency    `json:"downloadConcurrency"`
+	URLs                []TypeBlocklistURI `json:"urls"`
+	UpdateEach          TypeDuration       `json:"updateEach"`
+}
+
 type Config struct {
-	Debug                bool          `json:"debug"`
-	Secret               mtglib.Secret `json:"secret"`
-	BindTo               TypeHostPort  `json:"bind-to"`
-	TCPBuffer            TypeBytes     `json:"tcp-buffer"`
-	PreferIP             TypePreferIP  `json:"prefer-ip"`
-	DomainFrontingPort   TypePort      `json:"domain-fronting-port"`
-	TolerateTimeSkewness TypeDuration  `json:"tolerate-time-skewness"`
-	Concurrency          uint          `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"`
+	DomainFronting              struct {
+		IP            TypeIP   `json:"ip"`
+		Port          TypePort `json:"port"`
+		ProxyProtocol TypeBool `json:"proxyProtocol"`
+	} `json:"domainFronting"`
+	Defense struct {
 		AntiReplay struct {
-			Enabled   bool          `json:"enabled"`
-			MaxSize   TypeBytes     `json:"max-size"`
-			ErrorRate TypeErrorRate `json:"error-rate"`
-		} `json:"anti-replay"`
-		Blocklist struct {
-			Enabled             bool               `json:"enabled"`
-			DownloadConcurrency uint               `json:"download-concurrency"`
-			URLs                []TypeBlocklistURI `json:"urls"`
-			UpdateEach          TypeDuration       `json:"update-each"`
-		} `json:"blocklist"`
+			Optional
+
+			MaxSize   TypeBytes     `json:"maxSize"`
+			ErrorRate TypeErrorRate `json:"errorRate"`
+		} `json:"antiReplay"`
+		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 {
@@ -37,31 +62,72 @@ type Config struct {
 			HTTP TypeDuration `json:"http"`
 			Idle TypeDuration `json:"idle"`
 		} `json:"timeout"`
-		DOHIP   TypeIP    `json:"doh-ip"`
-		Proxies []TypeURL `json:"proxies"`
+		DOHIP   TypeIP         `json:"dohIp"`
+		DNS     TypeDNSURI     `json:"dns"`
+		Proxies []TypeProxyURL `json:"proxies"`
 	} `json:"network"`
 	Stats struct {
 		StatsD struct {
-			Enabled      bool                `json:"enabled"`
+			Optional
+
 			Address      TypeHostPort        `json:"address"`
-			MetricPrefix TypeMetricPrefix    `json:"metric-prefix"`
-			TagFormat    TypeStatsdTagFormat `json:"tag-format"`
+			MetricPrefix TypeMetricPrefix    `json:"metricPrefix"`
+			TagFormat    TypeStatsdTagFormat `json:"tagFormat"`
 		} `json:"statsd"`
 		Prometheus struct {
-			Enabled      bool             `json:"enabled"`
-			BindTo       TypeHostPort     `json:"bind-to"`
-			HTTPPath     TypeHTTPPath     `json:"http-path"`
-			MetricPrefix TypeMetricPrefix `json:"metric-prefix"`
+			Optional
+
+			BindTo       TypeHostPort     `json:"bindTo"`
+			HTTPPath     TypeHTTPPath     `json:"httpPath"`
+			MetricPrefix TypeMetricPrefix `json:"metricPrefix"`
 		} `json:"prometheus"`
 	} `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())
 	}
 
-	if len(c.BindTo.HostValue(nil)) == 0 || c.BindTo.PortValue(0) == 0 {
+	if c.BindTo.Get("") == "" {
 		return fmt.Errorf("incorrect bind-to parameter %s", c.BindTo.String())
 	}
 
@@ -80,78 +146,3 @@ func (c *Config) String() string {
 
 	return buf.String()
 }
-
-type configRaw struct {
-	Debug                bool   `toml:"debug" json:"debug,omitempty"`
-	Secret               string `toml:"secret" json:"secret"`
-	BindTo               string `toml:"bind-to" json:"bind-to"`
-	TCPBuffer            string `toml:"tcp-buffer" json:"tcp-buffer,omitempty"`
-	PreferIP             string `toml:"prefer-ip" json:"prefer-ip,omitempty"`
-	DomainFrontingPort   uint   `toml:"domain-fronting-port" json:"domain-fronting-port,omitempty"`
-	TolerateTimeSkewness string `toml:"tolerate-time-skewness" json:"tolerate-time-skewness,omitempty"`
-	Concurrency          uint   `toml:"concurrency" json:"concurrency,omitempty"`
-	Defense              struct {
-		AntiReplay struct {
-			Enabled   bool    `toml:"enabled" json:"enabled,omitempty"`
-			MaxSize   string  `toml:"max-size" json:"max-size,omitempty"`
-			ErrorRate float64 `toml:"error-rate" json:"error-rate,omitempty"`
-		} `toml:"anti-replay" json:"anti-replay,omitempty"`
-		Blocklist struct {
-			Enabled             bool     `toml:"enabled" json:"enabled,omitempty"`
-			DownloadConcurrency uint     `toml:"download-concurrency" json:"download-concurrency,omitempty"`
-			URLs                []string `toml:"urls" json:"urls,omitempty"`
-			UpdateEach          string   `toml:"update-each" json:"update-each,omitempty"`
-		} `toml:"blocklist" json:"blocklist,omitempty"`
-	} `toml:"defense" json:"defense,omitempty"`
-	Network struct {
-		Timeout struct {
-			TCP  string `toml:"tcp" json:"tcp,omitempty"`
-			HTTP string `toml:"http" json:"http,omitempty"`
-			Idle string `toml:"idle" json:"idle,omitempty"`
-		} `toml:"timeout" json:"timeout,omitempty"`
-		DOHIP   string   `toml:"doh-ip" json:"doh-ip,omitempty"`
-		Proxies []string `toml:"proxies" json:"proxies,omitempty"`
-	} `toml:"network" json:"network,omitempty"`
-	Stats struct {
-		StatsD struct {
-			Enabled      bool   `toml:"enabled" json:"enabled,omitempty"`
-			Address      string `toml:"address" json:"address,omitempty"`
-			MetricPrefix string `toml:"metric-prefix" json:"metric-prefix,omitempty"`
-			TagFormat    string `toml:"tag-format" json:"tag-format,omitempty"`
-		} `toml:"statsd" json:"statsd,omitempty"`
-		Prometheus struct {
-			Enabled      bool   `toml:"enabled" json:"enabled,omitempty"`
-			BindTo       string `toml:"bind-to" json:"bind-to,omitempty"`
-			HTTPPath     string `toml:"http-path" json:"http-path,omitempty"`
-			MetricPrefix string `toml:"metric-prefix" json:"metric-prefix,omitempty"`
-		} `toml:"prometheus" json:"prometheus,omitempty"`
-	} `toml:"stats" json:"stats,omitempty"`
-}
-
-func Parse(rawData []byte) (*Config, error) {
-	rawConf := &configRaw{}
-	jsonBuf := &bytes.Buffer{}
-	conf := &Config{}
-
-	jsonEncoder := json.NewEncoder(jsonBuf)
-	jsonEncoder.SetEscapeHTML(false)
-	jsonEncoder.SetIndent("", "")
-
-	if err := toml.Unmarshal(rawData, rawConf); err != nil {
-		return nil, fmt.Errorf("cannot parse toml config: %w", err)
-	}
-
-	if err := jsonEncoder.Encode(rawConf); err != nil {
-		panic(err)
-	}
-
-	if err := json.NewDecoder(jsonBuf).Decode(conf); err != nil {
-		return nil, fmt.Errorf("cannot parse a config: %w", err)
-	}
-
-	if err := conf.Validate(); err != nil {
-		return nil, fmt.Errorf("cannot validate config: %w", err)
-	}
-
-	return conf, nil
-}

internal/config/parse.go

@@ -0,0 +1,102 @@
+package config
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+
+	"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"`
+	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"`
+	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"`
+			ErrorRate float64 `toml:"error-rate" json:"errorRate,omitempty"`
+		} `toml:"anti-replay" json:"antiReplay,omitempty"`
+		Blocklist struct {
+			Enabled             bool     `toml:"enabled" json:"enabled,omitempty"`
+			DownloadConcurrency uint     `toml:"download-concurrency" json:"downloadConcurrency,omitempty"`
+			URLs                []string `toml:"urls" json:"urls,omitempty"`
+			UpdateEach          string   `toml:"update-each" json:"updateEach,omitempty"`
+		} `toml:"blocklist" json:"blocklist,omitempty"`
+		Allowlist struct {
+			Enabled             bool     `toml:"enabled" json:"enabled,omitempty"`
+			DownloadConcurrency uint     `toml:"download-concurrency" json:"downloadConcurrency,omitempty"`
+			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 {
+			TCP  string `toml:"tcp" json:"tcp,omitempty"`
+			HTTP string `toml:"http" json:"http,omitempty"`
+			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 {
+		StatsD struct {
+			Enabled      bool   `toml:"enabled" json:"enabled,omitempty"`
+			Address      string `toml:"address" json:"address,omitempty"`
+			MetricPrefix string `toml:"metric-prefix" json:"metricPrefix,omitempty"`
+			TagFormat    string `toml:"tag-format" json:"tagFormat,omitempty"`
+		} `toml:"statsd" json:"statsd,omitempty"`
+		Prometheus struct {
+			Enabled      bool   `toml:"enabled" json:"enabled,omitempty"`
+			BindTo       string `toml:"bind-to" json:"bindTo,omitempty"`
+			HTTPPath     string `toml:"http-path" json:"httpPath,omitempty"`
+			MetricPrefix string `toml:"metric-prefix" json:"metricPrefix,omitempty"`
+		} `toml:"prometheus" json:"prometheus,omitempty"`
+	} `toml:"stats" json:"stats,omitempty"`
+}
+
+func Parse(rawData []byte) (*Config, error) {
+	tomlConf := &tomlConfig{}
+	jsonBuf := &bytes.Buffer{}
+	conf := &Config{}
+
+	jsonEncoder := json.NewEncoder(jsonBuf)
+	jsonEncoder.SetEscapeHTML(false)
+	jsonEncoder.SetIndent("", "")
+
+	if err := toml.Unmarshal(rawData, tomlConf); err != nil {
+		return nil, fmt.Errorf("cannot parse toml config: %w", err)
+	}
+
+	if err := jsonEncoder.Encode(tomlConf); err != nil {
+		panic(err)
+	}
+
+	if err := json.NewDecoder(jsonBuf).Decode(conf); err != nil {
+		return nil, fmt.Errorf("cannot parse a config: %w", err)
+	}
+
+	return conf, nil
+}

internal/config/type_blocklist_uri.go

@@ -8,61 +8,70 @@ import (
 )
 
 type TypeBlocklistURI struct {
-	value string
+	Value string
 }
 
-func (c *TypeBlocklistURI) UnmarshalText(data []byte) error {
-	if len(data) == 0 {
-		return nil
-	}
-
-	text := string(data)
-	if filepath.IsAbs(text) {
-		if _, err := os.Stat(text); os.IsNotExist(err) {
-			return fmt.Errorf("filepath %s does not exist", text)
+func (t *TypeBlocklistURI) Set(value string) error {
+	if stat, err := os.Stat(value); err == nil || os.IsExist(err) {
+		switch {
+		case stat.IsDir():
+			return fmt.Errorf("value is correct filepath but directory")
+		case stat.Mode().Perm()&0o400 == 0:
+			return fmt.Errorf("value is correct filepath but not readable")
 		}
 
-		c.value = text
+		value, err = filepath.Abs(value)
+		if err != nil {
+			return fmt.Errorf(
+				"value is correct filepath but cannot resolve absolute (%s): %w",
+				value, err)
+		}
+
+		t.Value = value
 
 		return nil
 	}
 
-	parsedURL, err := url.Parse(text)
+	parsedURL, err := url.Parse(value)
 	if err != nil {
-		return fmt.Errorf("incorrect url: %w", err)
+		return fmt.Errorf("incorrect url (%s): %w", value, err)
 	}
 
 	switch parsedURL.Scheme {
-	case "http", "https": // nolint: goconst
+	case "http", "https":
 	default:
-		return fmt.Errorf("unknown schema %s", parsedURL.Scheme)
+		return fmt.Errorf("unknown schema %s (%s)", parsedURL.Scheme, value)
 	}
 
 	if parsedURL.Host == "" {
-		return fmt.Errorf("incorrect url %s", text)
+		return fmt.Errorf("incorrect url %s", value)
 	}
 
-	c.value = parsedURL.String()
+	t.Value = parsedURL.String()
 
 	return nil
 }
 
-func (c TypeBlocklistURI) MarshalText() ([]byte, error) {
-	return []byte(c.value), nil
-}
-
-func (c TypeBlocklistURI) String() string {
-	return c.value
-}
-
-func (c TypeBlocklistURI) IsRemote() bool {
-	return !filepath.IsAbs(c.value)
-}
-
-func (c TypeBlocklistURI) Value(defaultValue string) string {
-	if c.value == "" {
+func (t TypeBlocklistURI) Get(defaultValue string) string {
+	if t.Value == "" {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t TypeBlocklistURI) IsRemote() bool {
+	return !filepath.IsAbs(t.Value)
+}
+
+func (t *TypeBlocklistURI) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeBlocklistURI) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeBlocklistURI) String() string {
+	return t.Value
 }

internal/config/type_blocklist_uri_test.go

@@ -1,12 +1,10 @@
 package config_test
 
 import (
-	"crypto/rand"
-	"encoding/base64"
 	"encoding/json"
 	"os"
 	"path/filepath"
-	"strconv"
+	"strings"
 	"testing"
 
 	"github.com/9seconds/mtg/v2/internal/config"
@@ -20,42 +18,28 @@ type typeBlocklistURITestStruct struct {
 
 type TypeBlocklistURITestSuite struct {
 	suite.Suite
+
+	directory    string
+	absDirectory string
 }
 
-func (suite *TypeBlocklistURITestSuite) TestUnmarshalNil() {
-	typ := &config.TypeBlocklistURI{}
-	suite.NoError(typ.UnmarshalText(nil))
-	suite.Empty(typ.String())
-}
+func (suite *TypeBlocklistURITestSuite) SetupSuite() {
+	dir, _ := os.Getwd()
+	absDir, _ := filepath.Abs(dir)
 
-func (suite *TypeBlocklistURITestSuite) TestUnknownSchema() {
-	typ := &config.TypeBlocklistURI{}
-	suite.Error(typ.UnmarshalText([]byte("gopher://lalala")))
-}
-
-func (suite *TypeBlocklistURITestSuite) TestEmptyHost() {
-	typ := &config.TypeBlocklistURI{}
-	suite.Error(typ.UnmarshalText([]byte("https:///path")))
-}
-
-func (suite *TypeBlocklistURITestSuite) TestIncorrectURL() {
-	typ := &config.TypeBlocklistURI{}
-	suite.Error(typ.UnmarshalText([]byte("h:/--")))
+	suite.directory = dir
+	suite.absDirectory = absDir
 }
 
 func (suite *TypeBlocklistURITestSuite) TestUnmarshalFail() {
-	rnd := make([]byte, 48)
-
-	rand.Read(rnd) // nolint: errcheck
-
-	unknownPath := base64.StdEncoding.EncodeToString(rnd)
-
 	testData := []string{
-		"1",
-		unknownPath,
-		"/" + unknownPath,
-		"http:/",
-		"gopher://lalalal",
+		"gopher://lalala",
+		"https:///paths",
+		"h:/=",
+		filepath.Join(suite.directory, "___"),
+		filepath.Join(suite.absDirectory, "___"),
+		suite.directory,
+		suite.absDirectory,
 	}
 
 	for _, v := range testData {
@@ -71,13 +55,12 @@ func (suite *TypeBlocklistURITestSuite) TestUnmarshalFail() {
 }
 
 func (suite *TypeBlocklistURITestSuite) TestUnmarshalOk() {
-	dir, _ := os.Getwd()
-	dir, _ = filepath.Abs(dir)
-
 	testData := []string{
 		"http://lalala",
-		filepath.Join(dir, "config.go"),
 		"https://lalala",
+		"https://lalala/path",
+		filepath.Join(suite.directory, "config.go"),
+		filepath.Join(suite.absDirectory, "config.go"),
 	}
 
 	for _, v := range testData {
@@ -92,77 +75,9 @@ func (suite *TypeBlocklistURITestSuite) TestUnmarshalOk() {
 			testStruct := &typeBlocklistURITestStruct{}
 
 			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.EqualValues(t, value, testStruct.Value.Value(""))
-		})
-	}
-}
+			assert.EqualValues(t, value, testStruct.Value.Get(""))
 
-func (suite *TypeBlocklistURITestSuite) TestMarshalOk() {
-	dir, _ := os.Getwd()
-	dir, _ = filepath.Abs(dir)
-
-	testData := []string{
-		"http://lalalal",
-		filepath.Join(dir, "config.go"),
-	}
-
-	for _, v := range testData {
-		name := v
-
-		data, err := json.Marshal(map[string]string{
-			"value": name,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(name, func(t *testing.T) {
-			testStruct := &typeBlocklistURITestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, name, testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalText()
-			assert.NoError(t, err)
-			assert.Equal(t, name, string(marshalled))
-		})
-	}
-}
-
-func (suite *TypeBlocklistURITestSuite) TestValue() {
-	testStruct := &typeBlocklistURITestStruct{}
-
-	suite.Equal("http://lalala", testStruct.Value.Value("http://lalala"))
-
-	data, err := json.Marshal(map[string]string{
-		"value": "http://blablabla",
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.Equal("http://blablabla", testStruct.Value.Value(""))
-}
-
-func (suite *TypeBlocklistURITestSuite) TestIsRemote() {
-	dir, _ := os.Getwd()
-	dir, _ = filepath.Abs(dir)
-
-	testData := map[bool]string{
-		true:  "http://lalalal",
-		false: filepath.Join(dir, "config.go"),
-	}
-
-	for k, v := range testData {
-		ok := k
-
-		data, err := json.Marshal(map[string]string{
-			"value": v,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(strconv.FormatBool(ok), func(t *testing.T) {
-			testStruct := &typeBlocklistURITestStruct{}
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-
-			if ok {
+			if strings.HasPrefix(value, "http") {
 				assert.True(t, testStruct.Value.IsRemote())
 			} else {
 				assert.False(t, testStruct.Value.IsRemote())
@@ -171,6 +86,27 @@ func (suite *TypeBlocklistURITestSuite) TestIsRemote() {
 	}
 }
 
+func (suite *TypeBlocklistURITestSuite) TestMarshalOk() {
+	testStruct := &typeBlocklistURITestStruct{
+		Value: config.TypeBlocklistURI{
+			Value: "http://some.url/with/path",
+		},
+	}
+
+	data, err := json.Marshal(testStruct)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": "http://some.url/with/path"}`, string(data))
+}
+
+func (suite *TypeBlocklistURITestSuite) TestGet() {
+	value := config.TypeBlocklistURI{}
+	suite.Equal("/path", value.Get("/path"))
+
+	suite.NoError(value.Set("http://lalala.ru"))
+	suite.Equal("http://lalala.ru", value.Get("/path"))
+	suite.Equal("http://lalala.ru", value.Get(""))
+}
+
 func TestTypeBlocklistURI(t *testing.T) {
 	t.Parallel()
 	suite.Run(t, &TypeBlocklistURITestSuite{})

internal/config/type_bool.go

@@ -0,0 +1,37 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type TypeBool struct {
+	Value bool
+}
+
+func (t *TypeBool) Set(data string) error {
+	parsed, err := strconv.ParseBool(data)
+	if err != nil {
+		return fmt.Errorf("incorrect bool value: %s", data)
+	}
+
+	t.Value = parsed
+
+	return nil
+}
+
+func (t TypeBool) Get(defaultValue bool) bool {
+	return t.Value || defaultValue
+}
+
+func (t *TypeBool) UnmarshalJSON(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeBool) MarshalJSON() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeBool) String() string {
+	return strconv.FormatBool(t.Value)
+}

internal/config/type_bool_test.go

@@ -0,0 +1,107 @@
+package config_test
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+	"testing"
+
+	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+)
+
+type typeBoolTestStruct struct {
+	Value config.TypeBool `json:"value"`
+}
+
+type TypeBoolTestSuite struct {
+	suite.Suite
+}
+
+func (suite *TypeBoolTestSuite) TestUnmarshalFail() {
+	testData := []any{
+		"",
+		"np",
+		"нет",
+		int(10),
+		[]int{},
+	}
+
+	for _, v := range testData {
+		data, err := json.Marshal(map[string]any{
+			"value": v,
+		})
+		suite.NoError(err)
+
+		suite.T().Run(fmt.Sprintf("%v", v), func(t *testing.T) {
+			assert.Error(t, json.Unmarshal(data, &typeBoolTestStruct{}))
+		})
+	}
+}
+
+func (suite *TypeBoolTestSuite) TestUnmarshalOk() {
+	testData := []bool{
+		true,
+		false,
+	}
+
+	for _, v := range testData {
+		value := v
+
+		data, err := json.Marshal(map[string]bool{
+			"value": v,
+		})
+		suite.NoError(err)
+
+		suite.T().Run(strconv.FormatBool(v), func(t *testing.T) {
+			testStruct := &typeBoolTestStruct{}
+			assert.NoError(t, json.Unmarshal(data, testStruct))
+
+			if value {
+				assert.True(t, testStruct.Value.Value)
+			} else {
+				assert.False(t, testStruct.Value.Value)
+			}
+		})
+	}
+}
+
+func (suite *TypeBoolTestSuite) TestMarshalOk() {
+	for _, v := range []bool{true, false} {
+		value := v
+
+		suite.T().Run(strconv.FormatBool(v), func(t *testing.T) {
+			testStruct := typeBoolTestStruct{
+				Value: config.TypeBool{
+					Value: value,
+				},
+			}
+
+			encodedJSON, err := json.Marshal(testStruct)
+			assert.NoError(t, err)
+
+			expectedJSON, err := json.Marshal(map[string]bool{
+				"value": value,
+			})
+			assert.NoError(t, err)
+
+			assert.JSONEq(t, string(expectedJSON), string(encodedJSON))
+		})
+	}
+}
+
+func (suite *TypeBoolTestSuite) TestGet() {
+	value := config.TypeBool{}
+	suite.False(value.Get(false))
+	suite.True(value.Get(true))
+
+	value.Value = true
+	suite.True(value.Get(false))
+	suite.True(value.Get(true))
+}
+
+func TestTypeBool(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &TypeBoolTestSuite{})
+}

internal/config/type_bytes.go

@@ -7,48 +7,49 @@ import (
 	"github.com/alecthomas/units"
 )
 
+var typeBytesStringCleaner = strings.NewReplacer(" ", "", "\t", "", "IB", "iB")
+
 type TypeBytes struct {
-	value units.Base2Bytes
+	Value units.Base2Bytes
 }
 
-func (c *TypeBytes) UnmarshalText(data []byte) error {
-	if len(data) == 0 {
-		return nil
-	}
+func (t *TypeBytes) Set(value string) error {
+	normalizedValue := typeBytesStringCleaner.Replace(strings.ToUpper(value))
 
-	normalizedData := strings.ToUpper(string(data))
-	normalizedData = strings.ReplaceAll(normalizedData, "IB", "iB")
-
-	value, err := units.ParseBase2Bytes(normalizedData)
+	parsedValue, err := units.ParseBase2Bytes(normalizedValue)
 	if err != nil {
-		return fmt.Errorf("incorrect bytes value: %w", err)
+		return fmt.Errorf("incorrect bytes value (%v): %w", value, err)
 	}
 
-	if value < 0 {
-		return fmt.Errorf("%d should be positive number", value)
+	if parsedValue < 0 {
+		return fmt.Errorf("bytes should be positive (%s)", value)
 	}
 
-	c.value = value
+	t.Value = parsedValue
 
 	return nil
 }
 
-func (c TypeBytes) MarshalText() ([]byte, error) {
-	return []byte(c.String()), nil
-}
-
-func (c TypeBytes) String() string {
-	if c.value == 0 {
-		return ""
-	}
-
-	return strings.ToLower(c.value.String())
-}
-
-func (c TypeBytes) Value(defaultValue uint) uint {
-	if c.value == 0 {
+func (t TypeBytes) Get(defaultValue uint) uint {
+	if t.Value == 0 {
 		return defaultValue
 	}
 
-	return uint(c.value)
+	return uint(t.Value)
+}
+
+func (t *TypeBytes) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeBytes) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeBytes) String() string {
+	if t.Value == 0 {
+		return ""
+	}
+
+	return strings.ToLower(t.Value.String())
 }

internal/config/type_bytes_test.go

@@ -17,19 +17,12 @@ type TypeBytesTestSuite struct {
 	suite.Suite
 }
 
-func (suite *TypeBytesTestSuite) TestUnmarshalNil() {
-	typ := &config.TypeBytes{}
-	suite.NoError(typ.UnmarshalText(nil))
-	suite.Empty(typ.String())
-}
-
 func (suite *TypeBytesTestSuite) TestUnmarshalFail() {
 	testData := []string{
 		"1m",
 		"1",
 		"-1kb",
 		"-1kib",
-		"-1QB",
 	}
 
 	for _, v := range testData {
@@ -65,53 +58,26 @@ func (suite *TypeBytesTestSuite) TestUnmarshalOk() {
 			testStruct := &typeBytesTestStruct{}
 
 			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.EqualValues(t, value, testStruct.Value.Value(0))
+			assert.EqualValues(t, value, testStruct.Value.Get(0))
 		})
 	}
 }
 
 func (suite *TypeBytesTestSuite) TestMarshalOk() {
-	testData := []string{
-		"1b",
-		"1kib",
-		"2mib",
-	}
+	value := typeBytesTestStruct{}
+	suite.NoError(value.Value.Set("1kib"))
 
-	for _, v := range testData {
-		name := v
-
-		data, err := json.Marshal(map[string]string{
-			"value": name,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(name, func(t *testing.T) {
-			testStruct := &typeBytesTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, name, testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalText()
-			assert.NoError(t, err)
-			assert.Equal(t, name, string(marshalled))
-		})
-	}
+	data, err := json.Marshal(value)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": "1kib"}`, string(data))
 }
 
-func (suite *TypeBytesTestSuite) TestValue() {
-	testStruct := &typeBytesTestStruct{}
+func (suite *TypeBytesTestSuite) TestGet() {
+	value := config.TypeBytes{}
+	suite.EqualValues(1000, value.Get(1000))
 
-	suite.EqualValues(0, testStruct.Value.Value(0))
-	suite.EqualValues(1, testStruct.Value.Value(1))
-
-	data, err := json.Marshal(map[string]string{
-		"value": "1kb",
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.EqualValues(1024, testStruct.Value.Value(0))
-	suite.EqualValues(1024, testStruct.Value.Value(1))
+	suite.NoError(value.Set("1mib"))
+	suite.EqualValues(1048576, value.Get(1000))
 }
 
 func TestTypeBytes(t *testing.T) {

internal/config/type_concurrency.go

@@ -0,0 +1,45 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type TypeConcurrency struct {
+	Value uint
+}
+
+func (t *TypeConcurrency) Set(value string) error {
+	concurrencyValue, err := strconv.ParseUint(value, 10, 16)
+	if err != nil {
+		return fmt.Errorf("value is not uint (%s): %w", value, err)
+	}
+
+	if concurrencyValue == 0 {
+		return fmt.Errorf("value should be >0 (%s)", value)
+	}
+
+	t.Value = uint(concurrencyValue)
+
+	return nil
+}
+
+func (t TypeConcurrency) Get(defaultValue uint) uint {
+	if t.Value == 0 {
+		return defaultValue
+	}
+
+	return t.Value
+}
+
+func (t *TypeConcurrency) UnmarshalJSON(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeConcurrency) MarshalJSON() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeConcurrency) String() string {
+	return strconv.FormatUint(uint64(t.Value), 10)
+}

internal/config/type_concurrency_test.go

@@ -0,0 +1,73 @@
+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 typeConcurrencyTestStruct struct {
+	Value config.TypeConcurrency `json:"value"`
+}
+
+type TypeConcurrencyTestSuite struct {
+	suite.Suite
+}
+
+func (suite *TypeConcurrencyTestSuite) TestUnmarshalFail() {
+	testData := []string{
+		"-1",
+		"0",
+		"0.0",
+		"1.0",
+		"1.1",
+		".",
+		"some_value",
+	}
+
+	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, &typeConcurrencyTestStruct{}))
+		})
+	}
+}
+
+func (suite *TypeConcurrencyTestSuite) TestUnmarshalOk() {
+	testStruct := &typeConcurrencyTestStruct{}
+
+	suite.NoError(json.Unmarshal([]byte(`{"value": 1}`), testStruct))
+	suite.EqualValues(1, testStruct.Value.Get(2))
+}
+
+func (suite *TypeConcurrencyTestSuite) TestMarshalOk() {
+	testStruct := &typeConcurrencyTestStruct{
+		Value: config.TypeConcurrency{
+			Value: 2,
+		},
+	}
+
+	data, err := json.Marshal(testStruct)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": 2}`, string(data))
+}
+
+func (suite *TypeConcurrencyTestSuite) TestGet() {
+	value := config.TypeConcurrency{}
+	suite.EqualValues(1, value.Get(1))
+
+	value.Value = 3
+	suite.EqualValues(3, value.Get(1))
+}
+
+func TestTypeConcurrency(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &TypeConcurrencyTestSuite{})
+}

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_duration.go

@@ -6,41 +6,48 @@ import (
 	"time"
 )
 
+var typeDurationStringCleaner = strings.NewReplacer(" ", "", "\t", "")
+
 type TypeDuration struct {
-	value time.Duration
+	Value time.Duration
 }
 
-func (c *TypeDuration) UnmarshalText(data []byte) error {
-	if len(data) == 0 {
-		return nil
-	}
-
-	dur, err := time.ParseDuration(strings.ToLower(string(data)))
+func (t *TypeDuration) Set(value string) error {
+	parsedValue, err := time.ParseDuration(
+		typeDurationStringCleaner.Replace(strings.ToLower(value)))
 	if err != nil {
-		return fmt.Errorf("incorrect duration: %w", err)
+		return fmt.Errorf("incorrect duration (%s): %w", value, err)
 	}
 
-	if dur < 0 {
-		return fmt.Errorf("%s should be positive duration", dur)
+	if parsedValue < 0 {
+		return fmt.Errorf("duration has to be a positive: %s", value)
 	}
 
-	c.value = dur
+	t.Value = parsedValue
 
 	return nil
 }
 
-func (c TypeDuration) MarshalText() ([]byte, error) {
-	return []byte(c.value.String()), nil
-}
-
-func (c TypeDuration) String() string {
-	return c.value.String()
-}
-
-func (c TypeDuration) Value(defaultValue time.Duration) time.Duration {
-	if c.value == 0 {
+func (t TypeDuration) Get(defaultValue time.Duration) time.Duration {
+	if t.Value == 0 {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t *TypeDuration) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeDuration) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeDuration) String() string {
+	if t.Value == 0 {
+		return ""
+	}
+
+	return t.Value.String()
 }

internal/config/type_duration_test.go

@@ -18,18 +18,12 @@ type TypeDurationTestSuite struct {
 	suite.Suite
 }
 
-func (suite *TypeDurationTestSuite) TestUnmarshalNil() {
-	typ := &config.TypeDuration{}
-	suite.NoError(typ.UnmarshalText(nil))
-	suite.EqualValues(0, typ.Value(0))
-}
-
 func (suite *TypeDurationTestSuite) TestUnmarshalFail() {
 	testData := []string{
-		"1t",
-		"1",
 		"-1s",
-		"-1h",
+		"1 seconds ago",
+		"1s ago",
+		"",
 	}
 
 	for _, v := range testData {
@@ -47,8 +41,11 @@ func (suite *TypeDurationTestSuite) TestUnmarshalFail() {
 func (suite *TypeDurationTestSuite) TestUnmarshalOk() {
 	testData := map[string]time.Duration{
 		"1s":   time.Second,
-		"1m":   time.Minute,
-		"2h1s": 2*time.Hour + time.Second,
+		"0":    0 * time.Second,
+		"0s":   0 * time.Second,
+		"1\tM": time.Minute,
+		"1H":   time.Hour,
+		"1 h":  time.Hour,
 	}
 
 	for k, v := range testData {
@@ -63,53 +60,48 @@ func (suite *TypeDurationTestSuite) TestUnmarshalOk() {
 			testStruct := &typeDurationTestStruct{}
 
 			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, value, testStruct.Value.Value(0))
+			assert.Equal(t, value, testStruct.Value.Value)
 		})
 	}
 }
 
 func (suite *TypeDurationTestSuite) TestMarshalOk() {
-	testData := []string{
-		"1s",
-		"1m0s",
-		"2h0m1s",
+	testData := map[string]string{
+		"1s":  "1s",
+		"0":   "",
+		"0s":  "",
+		"0ms": "",
+		"1 H": "1h0m0s",
 	}
 
-	for _, v := range testData {
-		name := v
+	for k, v := range testData {
+		value := k
+		expected := v
 
-		data, err := json.Marshal(map[string]string{
-			"value": name,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(name, func(t *testing.T) {
+		suite.T().Run(value, func(t *testing.T) {
 			testStruct := &typeDurationTestStruct{}
 
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, name, testStruct.Value.String())
+			assert.NoError(t, testStruct.Value.Set(value))
 
-			marshalled, err := testStruct.Value.MarshalText()
+			data, err := json.Marshal(testStruct)
 			assert.NoError(t, err)
-			assert.Equal(t, name, string(marshalled))
+
+			expectedJSON, err := json.Marshal(map[string]string{
+				"value": expected,
+			})
+			assert.NoError(t, err)
+
+			assert.JSONEq(t, string(expectedJSON), string(data))
 		})
 	}
 }
 
-func (suite *TypeDurationTestSuite) TestValue() {
-	testStruct := &typeDurationTestStruct{}
+func (suite *TypeDurationTestSuite) TestGet() {
+	value := config.TypeDuration{}
+	suite.Equal(time.Second, value.Get(time.Second))
 
-	suite.EqualValues(0, testStruct.Value.Value(0))
-	suite.Equal(time.Second, testStruct.Value.Value(time.Second))
-
-	data, err := json.Marshal(map[string]string{
-		"value": "1s",
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.Equal(time.Second, testStruct.Value.Value(0))
-	suite.Equal(time.Second, testStruct.Value.Value(time.Minute))
+	value.Value = 3 * time.Second
+	suite.Equal(3*time.Second, value.Get(time.Hour))
 }
 
 func TestTypeDuration(t *testing.T) {

internal/config/type_error_rate.go

@@ -8,36 +8,40 @@ import (
 const typeErrorRateIgnoreLess = 1e-8
 
 type TypeErrorRate struct {
-	value float64
+	Value float64
 }
 
-func (c *TypeErrorRate) UnmarshalJSON(data []byte) error {
-	value, err := strconv.ParseFloat(string(data), 64)
+func (t *TypeErrorRate) Set(value string) error {
+	parsedValue, err := strconv.ParseFloat(value, 64)
 	if err != nil {
-		return fmt.Errorf("incorrect float value: %w", err)
+		return fmt.Errorf("value is not a float (%s): %w", value, err)
 	}
 
-	if value <= 0 || value >= 100 {
-		return fmt.Errorf("%f should be 0 < x < 100", value)
+	if parsedValue <= 0.0 || parsedValue >= 100.0 {
+		return fmt.Errorf("value should be 0 < x < 100 (%s)", value)
 	}
 
-	c.value = value
+	t.Value = parsedValue
 
 	return nil
 }
 
-func (c *TypeErrorRate) MarshalText() ([]byte, error) {
-	return []byte(c.String()), nil
-}
-
-func (c TypeErrorRate) String() string {
-	return strconv.FormatFloat(c.value, 'f', -1, 64)
-}
-
-func (c TypeErrorRate) Value(defaultValue float64) float64 {
-	if c.value < typeErrorRateIgnoreLess {
+func (t TypeErrorRate) Get(defaultValue float64) float64 {
+	if t.Value < typeErrorRateIgnoreLess {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t *TypeErrorRate) UnmarshalJSON(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeErrorRate) MarshalJSON() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeErrorRate) String() string {
+	return strconv.FormatFloat(t.Value, 'f', -1, 64)
 }

internal/config/type_error_rate_test.go

@@ -2,7 +2,6 @@ package config_test
 
 import (
 	"encoding/json"
-	"strconv"
 	"testing"
 
 	"github.com/9seconds/mtg/v2/internal/config"
@@ -19,104 +18,61 @@ type TypeErrorRateTestSuite struct {
 }
 
 func (suite *TypeErrorRateTestSuite) TestUnmarshalFail() {
-	testData := []float64{
-		1000,
-		-100,
-		-0.0001,
+	testData := []string{
+		"",
+		"1s",
+		"1,",
+		"1,2",
+		".",
+		"3.4.5",
+		"3.5.",
+		".3.5",
+		"some word",
+		"1e2",
+		"-1.0",
 	}
 
 	for _, v := range testData {
-		data, err := json.Marshal(map[string]float64{
+		data, err := json.Marshal(map[string]string{
 			"value": v,
 		})
 		suite.NoError(err)
 
-		suite.T().Run(strconv.FormatFloat(v, 'f', -1, 64), func(t *testing.T) {
+		suite.T().Run(v, func(t *testing.T) {
 			assert.Error(t, json.Unmarshal(data, &typeErrorRateTestStruct{}))
 		})
 	}
-
-	data, err := json.Marshal(map[string]string{
-		"value": "hello",
-	})
-	suite.NoError(err)
-	suite.Error(json.Unmarshal(data, &typeErrorRateTestStruct{}))
 }
 
 func (suite *TypeErrorRateTestSuite) TestUnmarshalOk() {
-	testData := []float64{
-		1,
-		55.5,
-		0.0001,
-		1e-6,
-	}
+	data, err := json.Marshal(map[string]float64{
+		"value": 1.0,
+	})
+	suite.NoError(err)
 
-	for _, v := range testData {
-		value := v
-
-		data, err := json.Marshal(map[string]float64{
-			"value": v,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(strconv.FormatFloat(v, 'f', -1, 64), func(t *testing.T) {
-			testStruct := &typeErrorRateTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.InEpsilon(t, value, testStruct.Value.Value(0), 1e-10)
-		})
-	}
+	testStruct := &typeErrorRateTestStruct{}
+	suite.NoError(json.Unmarshal(data, testStruct))
+	suite.InEpsilon(1.0, testStruct.Value.Value, 1e-10)
 }
 
 func (suite *TypeErrorRateTestSuite) TestMarshalOk() {
-	testData := []float64{
-		1,
-		55.5,
-		0.0001,
-		1e-6,
+	testStruct := typeErrorRateTestStruct{
+		Value: config.TypeErrorRate{
+			Value: 1.01,
+		},
 	}
 
-	for _, v := range testData {
-		value := v
-
-		data, err := json.Marshal(map[string]float64{
-			"value": v,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(strconv.FormatFloat(v, 'f', -1, 64), func(t *testing.T) {
-			testStruct := &typeErrorRateTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-
-			parsed, err := strconv.ParseFloat(testStruct.Value.String(), 64)
-			assert.NoError(t, err)
-			assert.InEpsilon(t, value, parsed, 1e-10)
-
-			marshalled, err := testStruct.Value.MarshalText()
-			assert.NoError(t, err)
-
-			parsed, err = strconv.ParseFloat(string(marshalled), 64)
-			assert.NoError(t, err)
-			assert.InEpsilon(t, value, parsed, 1e-10)
-		})
-	}
+	encodedJSON, err := json.Marshal(testStruct)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": 1.01}`, string(encodedJSON))
 }
 
-func (suite *TypeErrorRateTestSuite) TestValue() {
-	testStruct := &typeErrorRateTestStruct{}
+func (suite *TypeErrorRateTestSuite) TestGet() {
+	value := config.TypeErrorRate{}
+	suite.InEpsilon(1.0, value.Get(1.0), 1e-10)
 
-	suite.InEpsilon(1, testStruct.Value.Value(1), 1e-10)
-	suite.InEpsilon(2, testStruct.Value.Value(2), 1e-10)
-
-	data, err := json.Marshal(map[string]float64{
-		"value": 1,
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.InEpsilon(1, testStruct.Value.Value(2), 1e-10)
-	suite.InEpsilon(1, testStruct.Value.Value(3), 1e-10)
+	value.Value = 5.0
+	suite.InEpsilon(5.0, value.Get(1.0), 1e-10)
 }
 
 func TestTypeErrorRate(t *testing.T) {

internal/config/type_hostport.go

@@ -7,61 +7,57 @@ import (
 )
 
 type TypeHostPort struct {
-	host TypeIP
-	port TypePort
+	Value string
+	Host  string
+	Port  uint
 }
 
-func (c *TypeHostPort) UnmarshalText(data []byte) error {
-	if len(data) == 0 {
-		return nil
-	}
-
-	text := string(data)
-
-	host, port, err := net.SplitHostPort(text)
+func (t *TypeHostPort) Set(value string) error {
+	host, port, err := net.SplitHostPort(value)
 	if err != nil {
-		return fmt.Errorf("incorrect host:port syntax: %w", err)
+		return fmt.Errorf("incorrect host:port value (%v): %w", value, err)
 	}
 
-	if port == "" {
-		return fmt.Errorf("port in %s host:port pair cannot be empty", text)
+	portValue, err := strconv.ParseUint(port, 10, 16)
+	if err != nil {
+		return fmt.Errorf("incorrect port number (%v): %w", value, err)
 	}
 
-	if err := c.port.UnmarshalJSON([]byte(port)); err != nil {
-		return fmt.Errorf("incorrect port in host:port: %w", err)
+	if portValue == 0 {
+		return fmt.Errorf("incorrect port number (%s)", value)
 	}
 
-	if err := c.host.UnmarshalText([]byte(host)); err != nil {
-		return fmt.Errorf("incorrect host: %w", err)
+	if host == "" {
+		return fmt.Errorf("empty host: %s", value)
 	}
 
+	if net.ParseIP(host) == nil {
+		return fmt.Errorf("host is not an IP address: %s", value)
+	}
+
+	t.Value = net.JoinHostPort(host, port)
+	t.Port = uint(portValue)
+	t.Host = host
+
 	return nil
 }
 
-func (c TypeHostPort) MarshalText() ([]byte, error) {
-	return []byte(c.String()), nil
-}
-
-func (c TypeHostPort) String() string {
-	return c.Value(net.IP{}, 0)
-}
-
-func (c TypeHostPort) HostValue(defaultValue net.IP) net.IP {
-	return c.host.Value(defaultValue)
-}
-
-func (c TypeHostPort) PortValue(defaultValue uint) uint {
-	return c.port.Value(defaultValue)
-}
-
-func (c TypeHostPort) Value(defaultHostValue net.IP, defaultPortValue uint) string {
-	host := c.HostValue(defaultHostValue)
-	port := c.PortValue(defaultPortValue)
-
-	hostStr := ""
-	if len(host) > 0 {
-		hostStr = host.String()
+func (t TypeHostPort) Get(defaultValue string) string {
+	if t.Value == "" {
+		return defaultValue
 	}
 
-	return net.JoinHostPort(hostStr, strconv.Itoa(int(port)))
+	return t.Value
+}
+
+func (t *TypeHostPort) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeHostPort) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeHostPort) String() string {
+	return t.Value
 }

internal/config/type_hostport_test.go

@@ -2,7 +2,6 @@ package config_test
 
 import (
 	"encoding/json"
-	"net"
 	"testing"
 
 	"github.com/9seconds/mtg/v2/internal/config"
@@ -20,11 +19,13 @@ type TypeHostPortTestSuite struct {
 
 func (suite *TypeHostPortTestSuite) TestUnmarshalFail() {
 	testData := []string{
-		"10.0.0.10:aaa",
-		"10.0.0.10:",
 		":",
-		"xxx",
-		"xxx:80",
+		":800",
+		"127.0.0.1:8000000",
+		"12...:80",
+		"",
+		"localhost",
+		"google.com:",
 	}
 
 	for _, v := range testData {
@@ -41,9 +42,8 @@ func (suite *TypeHostPortTestSuite) TestUnmarshalFail() {
 
 func (suite *TypeHostPortTestSuite) TestUnmarshalOk() {
 	testData := []string{
-		"10.0.0.10:80",
-		"0.0.0.0:80",
-		":8000",
+		"127.0.0.1:80",
+		"10.0.0.10:6553",
 	}
 
 	for _, v := range testData {
@@ -56,57 +56,30 @@ func (suite *TypeHostPortTestSuite) TestUnmarshalOk() {
 
 		suite.T().Run(v, func(t *testing.T) {
 			testStruct := &typeHostPortTestStruct{}
-
 			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.EqualValues(t, value, testStruct.Value.Value(nil, 0))
+			assert.Equal(t, value, testStruct.Value.Value)
 		})
 	}
 }
 
 func (suite *TypeHostPortTestSuite) TestMarshalOk() {
-	testData := []string{
-		"10.0.0.10:80",
-		"0.0.0.0:80",
-		":8000",
+	testStruct := typeHostPortTestStruct{
+		Value: config.TypeHostPort{
+			Value: "127.0.0.1:8000",
+		},
 	}
 
-	for _, v := range testData {
-		value := v
-
-		data, err := json.Marshal(map[string]string{
-			"value": v,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(v, func(t *testing.T) {
-			testStruct := &typeHostPortTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, value, testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalText()
-			assert.NoError(t, err)
-			assert.Equal(t, value, string(marshalled))
-		})
-	}
+	data, err := json.Marshal(testStruct)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": "127.0.0.1:8000"}`, string(data))
 }
 
-func (suite *TypeHostPortTestSuite) TestValue() {
-	testStruct := &typeHostPortTestStruct{}
+func (suite *TypeHostPortTestSuite) TestGet() {
+	value := config.TypeHostPort{}
+	suite.Equal("127.0.0.1:9000", value.Get("127.0.0.1:9000"))
 
-	suite.EqualValues("127.0.0.1:80",
-		testStruct.Value.Value(net.ParseIP("127.0.0.1"), 80))
-	suite.EqualValues("127.1.0.1:80",
-		testStruct.Value.Value(net.ParseIP("127.1.0.1"), 80))
-
-	data, err := json.Marshal(map[string]string{
-		"value": "127.0.0.1:80",
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.EqualValues("127.0.0.1:80", testStruct.Value.Value(nil, 0))
-	suite.EqualValues("127.0.0.1:80", testStruct.Value.Value(net.ParseIP("10.0.0.10"), 3000))
+	value.Value = "127.0.0.1:80"
+	suite.Equal("127.0.0.1:80", value.Get("127.0.0.1:9000"))
 }
 
 func TestTypeHostPort(t *testing.T) {

internal/config/type_http_path.go

@@ -3,33 +3,31 @@ package config
 import "strings"
 
 type TypeHTTPPath struct {
-	value string
+	Value string
 }
 
-func (c *TypeHTTPPath) UnmarshalText(data []byte) error {
-	if len(data) > 0 {
-		c.value = "/" + strings.Trim(string(data), "/")
-	}
+func (t *TypeHTTPPath) Set(value string) error {
+	t.Value = "/" + strings.Trim(value, "/")
 
 	return nil
 }
 
-func (c TypeHTTPPath) MarshalText() ([]byte, error) {
-	return []byte(c.String()), nil
-}
-
-func (c TypeHTTPPath) String() string {
-	if c.value == "" {
-		return "/"
-	}
-
-	return c.value
-}
-
-func (c TypeHTTPPath) Value(defaultValue string) string {
-	if c.value == "" {
+func (t TypeHTTPPath) Get(defaultValue string) string {
+	if t.Value == "" {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t *TypeHTTPPath) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeHTTPPath) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeHTTPPath) String() string {
+	return t.Value
 }

internal/config/type_http_path_test.go

@@ -17,72 +17,48 @@ type TypeHTTPPathTestSuite struct {
 	suite.Suite
 }
 
-func (suite *TypeHTTPPathTestSuite) TestUnmarshal() {
-	testData := []string{
-		"/hello",
-		"hello",
-		"hello/",
-		"/hello/",
+func (suite *TypeHTTPPathTestSuite) TestUnmarshalOk() {
+	testData := map[string]string{
+		"":      "/",
+		"/":     "/",
+		"/path": "/path",
+		"path":  "/path",
 	}
 
-	for _, v := range testData {
+	for k, v := range testData {
+		value := v
+
 		data, err := json.Marshal(map[string]string{
-			"value": v,
+			"value": k,
 		})
 		suite.NoError(err)
 
-		suite.T().Run(v, func(t *testing.T) {
+		suite.T().Run(k, func(t *testing.T) {
 			testStruct := &typeHTTPPathTestStruct{}
-
 			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, "/hello", testStruct.Value.Value(""))
+			assert.Equal(t, value, testStruct.Value.Get(""))
 		})
 	}
 }
 
 func (suite *TypeHTTPPathTestSuite) TestMarshalOk() {
-	testData := map[string]string{
-		"":        "/",
-		"/hello":  "/hello",
-		"/hello/": "/hello",
-		"hello/":  "/hello",
-		"hello":   "/hello",
+	value := typeHTTPPathTestStruct{
+		Value: config.TypeHTTPPath{
+			Value: "/path",
+		},
 	}
 
-	for k, v := range testData {
-		toPass := k
-		compareWith := v
-
-		data, err := json.Marshal(map[string]string{
-			"value": toPass,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(toPass, func(t *testing.T) {
-			testStruct := &typeHTTPPathTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, compareWith, testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalText()
-			assert.NoError(t, err)
-			assert.Equal(t, compareWith, string(marshalled))
-		})
-	}
+	data, err := json.Marshal(value)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": "/path"}`, string(data))
 }
 
-func (suite *TypeHTTPPathTestSuite) TestValue() {
-	testStruct := &typeHTTPPathTestStruct{}
+func (suite *TypeHTTPPathTestSuite) TestGet() {
+	value := config.TypeHTTPPath{}
+	suite.Equal("/hello", value.Get("/hello"))
 
-	suite.Equal("/hello", testStruct.Value.Value("/hello"))
-
-	data, err := json.Marshal(map[string]string{
-		"value": "/map",
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.Equal("/map", testStruct.Value.Value("/hello"))
+	suite.NoError(value.Set("/lalala"))
+	suite.Equal("/lalala", value.Get("/hello"))
 }
 
 func TestTypeHTTPPath(t *testing.T) {

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_ip.go

@@ -6,40 +6,40 @@ import (
 )
 
 type TypeIP struct {
-	value net.IP
+	Value net.IP
 }
 
-func (c *TypeIP) UnmarshalText(data []byte) error {
-	if len(data) == 0 {
-		return nil
-	}
-
-	ip := net.ParseIP(string(data))
+func (t *TypeIP) Set(value string) error {
+	ip := net.ParseIP(value)
 	if ip == nil {
-		return fmt.Errorf("incorrect ip address: %s", string(data))
+		return fmt.Errorf("incorret ip %s", value)
 	}
 
-	c.value = ip
+	t.Value = ip
 
 	return nil
 }
 
-func (c *TypeIP) MarshalText() ([]byte, error) {
-	return []byte(c.String()), nil
-}
-
-func (c TypeIP) String() string {
-	if len(c.value) > 0 {
-		return c.value.String()
-	}
-
-	return ""
-}
-
-func (c TypeIP) Value(defaultValue net.IP) net.IP {
-	if c.value == nil {
+func (t *TypeIP) Get(defaultValue net.IP) net.IP {
+	if len(t.Value) == 0 {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t *TypeIP) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeIP) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeIP) String() string {
+	if len(t.Value) == 0 {
+		return ""
+	}
+
+	return t.Value.String()
 }

internal/config/type_ip_test.go

@@ -20,10 +20,11 @@ type TypeIPTestSuite struct {
 
 func (suite *TypeIPTestSuite) TestUnmarshalFail() {
 	testData := []string{
-		"0.0.10",
-		"10.0.0.10:",
-		"xxx:80",
-		"2001:0db8:85a3:0000:0000:8a2e:4",
+		"",
+		"....",
+		"0...",
+		"300.200.200.800",
+		"[]",
 	}
 
 	for _, v := range testData {
@@ -39,74 +40,62 @@ func (suite *TypeIPTestSuite) TestUnmarshalFail() {
 }
 
 func (suite *TypeIPTestSuite) TestUnmarshalOk() {
-	testData := []string{
-		"0.0.0.0",
-		"10.0.0.10",
-		"2001:0db8:85a3:0000:0000:8a2e:0370:7334",
+	testData := map[string]string{
+		"2001:0db8:85a3:0000:0000:8a2e:0370:7334": "2001:db8:85a3::8a2e:370:7334",
+		"127.0.0.1": "127.0.0.1",
 	}
 
-	for _, v := range testData {
-		value := v
+	for k, v := range testData {
+		expected := v
 
 		data, err := json.Marshal(map[string]string{
-			"value": v,
+			"value": k,
 		})
 		suite.NoError(err)
 
-		suite.T().Run(v, func(t *testing.T) {
+		suite.T().Run(k, func(t *testing.T) {
 			testStruct := &typeIPTestStruct{}
-
 			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t,
-				net.ParseIP(value).String(),
-				testStruct.Value.Value(nil).String())
+			assert.Equal(t, expected, testStruct.Value.Get(nil).String())
 		})
 	}
 }
 
 func (suite *TypeIPTestSuite) TestMarshalOk() {
 	testData := []string{
-		"0.0.0.0",
-		"10.0.0.10",
-		"2001:0db8:85a3:0000:0000:8a2e:0370:7334",
+		"2001:db8:85a3::8a2e:370:7334",
+		"127.0.0.1",
 	}
 
 	for _, v := range testData {
-		value := net.ParseIP(v).String()
-
-		data, err := json.Marshal(map[string]string{
-			"value": v,
-		})
-		suite.NoError(err)
+		value := v
 
 		suite.T().Run(v, func(t *testing.T) {
-			testStruct := &typeIPTestStruct{}
+			testStruct := &typeIPTestStruct{
+				Value: config.TypeIP{
+					Value: net.ParseIP(value),
+				},
+			}
 
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, value, testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalText()
+			encodedJSON, err := json.Marshal(testStruct)
 			assert.NoError(t, err)
-			assert.Equal(t, value, string(marshalled))
+
+			expectedJSON, err := json.Marshal(map[string]string{
+				"value": value,
+			})
+			assert.NoError(t, err)
+
+			assert.JSONEq(t, string(expectedJSON), string(encodedJSON))
 		})
 	}
 }
 
-func (suite *TypeIPTestSuite) TestValue() {
-	testStruct := &typeIPTestStruct{}
-	suite.Empty(testStruct.Value.String())
+func (suite *TypeIPTestSuite) TestGet() {
+	value := config.TypeIP{}
+	suite.Equal("127.0.0.1", value.Get(net.ParseIP("127.0.0.1")).String())
 
-	suite.Nil(testStruct.Value.Value(nil))
-	suite.Equal("127.1.0.1", testStruct.Value.Value(net.ParseIP("127.1.0.1")).String())
-
-	data, err := json.Marshal(map[string]string{
-		"value": "127.0.0.1",
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.Equal("127.0.0.1", testStruct.Value.Value(nil).String())
-	suite.Equal("127.0.0.1", testStruct.Value.Value(net.ParseIP("10.0.0.10")).String())
+	suite.NoError(value.Set("127.0.0.2"))
+	suite.Equal("127.0.0.2", value.Get(net.ParseIP("127.0.0.1")).String())
 }
 
 func TestTypeIP(t *testing.T) {

internal/config/type_metric_prefix.go

@@ -6,36 +6,35 @@ import (
 )
 
 type TypeMetricPrefix struct {
-	value string
+	Value string
 }
 
-func (c *TypeMetricPrefix) UnmarshalText(data []byte) error {
-	if len(data) == 0 {
-		return nil
+func (t *TypeMetricPrefix) Set(value string) error {
+	if ok, err := regexp.MatchString("^[a-z0-9]+$", value); !ok || err != nil {
+		return fmt.Errorf("incorrect metric prefix %s: %w", value, err)
 	}
 
-	prefix := string(data)
-	if ok, err := regexp.MatchString("^[a-z0-9]+$", prefix); !ok || err != nil {
-		return fmt.Errorf("incorrect metric prefix: %s", prefix)
-	}
-
-	c.value = prefix
+	t.Value = value
 
 	return nil
 }
 
-func (c TypeMetricPrefix) MarshalText() ([]byte, error) {
-	return []byte(c.String()), nil
-}
-
-func (c TypeMetricPrefix) String() string {
-	return c.value
-}
-
-func (c TypeMetricPrefix) Value(defaultValue string) string {
-	if c.value == "" {
+func (t TypeMetricPrefix) Get(defaultValue string) string {
+	if t.Value == "" {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t *TypeMetricPrefix) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeMetricPrefix) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeMetricPrefix) String() string {
+	return t.Value
 }

internal/config/type_metric_prefix_test.go

@@ -17,18 +17,13 @@ type TypeMetricPrefixTestSuite struct {
 	suite.Suite
 }
 
-func (suite *TypeMetricPrefixTestSuite) TestUnmarshalNil() {
-	typ := &config.TypeMetricPrefix{}
-	suite.NoError(typ.UnmarshalText(nil))
-	suite.Empty(typ.String())
-}
-
 func (suite *TypeMetricPrefixTestSuite) TestUnmarshalFail() {
 	testData := []string{
-		"aaa.aaa",
-		"aaa-bbb",
-		"aaa:ccc",
-		"metric prefix",
+		"",
+		"-",
+		"hello/world",
+		"lala*",
+		"++sdf++",
 	}
 
 	for _, v := range testData {
@@ -44,69 +39,29 @@ func (suite *TypeMetricPrefixTestSuite) TestUnmarshalFail() {
 }
 
 func (suite *TypeMetricPrefixTestSuite) TestUnmarshalOk() {
-	testData := []string{
-		"mtg",
-		"mtg111",
-	}
-
-	for _, v := range testData {
-		value := v
-
-		data, err := json.Marshal(map[string]string{
-			"value": v,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(v, func(t *testing.T) {
-			testStruct := &typeMetricPrefixTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, value, testStruct.Value.Value(""))
-		})
-	}
+	testStruct := &typeMetricPrefixTestStruct{}
+	suite.NoError(json.Unmarshal([]byte(`{"value": "mtg"}`), testStruct))
+	suite.Equal("mtg", testStruct.Value.Get("lalala"))
 }
 
 func (suite *TypeMetricPrefixTestSuite) TestMarshalOk() {
-	testData := []string{
-		"mtg",
-		"mtg111",
+	testStruct := &typeMetricPrefixTestStruct{
+		Value: config.TypeMetricPrefix{
+			Value: "mtg",
+		},
 	}
 
-	for _, v := range testData {
-		value := v
-
-		data, err := json.Marshal(map[string]string{
-			"value": v,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(v, func(t *testing.T) {
-			testStruct := &typeMetricPrefixTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, value, testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalText()
-			assert.NoError(t, err)
-			assert.Equal(t, value, string(marshalled))
-		})
-	}
+	data, err := json.Marshal(testStruct)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": "mtg"}`, string(data))
 }
 
-func (suite *TypeMetricPrefixTestSuite) TestValue() {
-	testStruct := &typeMetricPrefixTestStruct{}
+func (suite *TypeMetricPrefixTestSuite) TestGet() {
+	value := config.TypeMetricPrefix{}
+	suite.Equal("lalala", value.Get("lalala"))
 
-	suite.Equal("mtg", testStruct.Value.Value("mtg"))
-	suite.Equal("vvv", testStruct.Value.Value("vvv"))
-
-	data, err := json.Marshal(map[string]string{
-		"value": "aaa",
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.Equal("aaa", testStruct.Value.Value("mtg"))
-	suite.Equal("aaa", testStruct.Value.Value("vvv"))
+	value.Value = "mtg"
+	suite.Equal("mtg", value.Get("lalala"))
 }
 
 func TestTypeMetricPrefix(t *testing.T) {

internal/config/type_port.go

@@ -6,40 +6,40 @@ import (
 )
 
 type TypePort struct {
-	value uint
+	Value uint
 }
 
-func (c *TypePort) UnmarshalJSON(data []byte) error {
-	if len(data) == 0 {
-		return nil
-	}
-
-	intValue, err := strconv.ParseUint(string(data), 10, 64)
+func (t *TypePort) Set(value string) error {
+	portValue, err := strconv.ParseUint(value, 10, 16)
 	if err != nil {
-		return fmt.Errorf("port number is not a number: %w", err)
+		return fmt.Errorf("incorrect port number (%v): %w", value, err)
 	}
 
-	if intValue == 0 || intValue >= 65536 {
-		return fmt.Errorf("port number should be 0 < portNo < 65536: %d", intValue)
+	if portValue == 0 {
+		return fmt.Errorf("incorrect port number (%s)", value)
 	}
 
-	c.value = uint(intValue)
+	t.Value = uint(portValue)
 
 	return nil
 }
 
-func (c *TypePort) MarshalJSON() ([]byte, error) {
-	return []byte(c.String()), nil
-}
-
-func (c TypePort) String() string {
-	return strconv.Itoa(int(c.value))
-}
-
-func (c TypePort) Value(defaultValue uint) uint {
-	if c.value == 0 {
+func (t TypePort) Get(defaultValue uint) uint {
+	if t.Value == 0 {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t *TypePort) UnmarshalJSON(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypePort) MarshalJSON() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypePort) String() string {
+	return strconv.Itoa(int(t.Value))
 }

internal/config/type_port_test.go

@@ -2,7 +2,6 @@ package config_test
 
 import (
 	"encoding/json"
-	"strconv"
 	"testing"
 
 	"github.com/9seconds/mtg/v2/internal/config"
@@ -18,97 +17,52 @@ type TypePortTestSuite struct {
 	suite.Suite
 }
 
-func (suite *TypePortTestSuite) TestUnmarshalNil() {
-	typ := &config.TypePort{}
-	suite.NoError(typ.UnmarshalJSON(nil))
-	suite.Equal("0", typ.String())
-}
-
 func (suite *TypePortTestSuite) TestUnmarshalFail() {
-	testData := []int{
-		-1,
-		1_000_000,
+	testData := []string{
+		"",
+		"port",
+		"0",
+		"-1",
+		"1.5",
+		"70000",
 	}
 
 	for _, v := range testData {
-		data, err := json.Marshal(map[string]int{
+		data, err := json.Marshal(map[string]string{
 			"value": v,
 		})
 		suite.NoError(err)
 
-		suite.T().Run(strconv.Itoa(v), func(t *testing.T) {
+		suite.T().Run(v, func(t *testing.T) {
 			assert.Error(t, json.Unmarshal(data, &typePortTestStruct{}))
 		})
 	}
 }
 
 func (suite *TypePortTestSuite) TestUnmarshalOk() {
-	testData := []int{
-		1,
-		1_000,
-		65535,
-	}
-
-	for _, v := range testData {
-		value := v
-
-		data, err := json.Marshal(map[string]int{
-			"value": v,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(strconv.Itoa(v), func(t *testing.T) {
-			testStruct := &typePortTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.EqualValues(t, value, testStruct.Value.Value(0))
-		})
-	}
+	testStruct := &typePortTestStruct{}
+	suite.NoError(json.Unmarshal([]byte(`{"value": 5}`), testStruct))
+	suite.EqualValues(5, testStruct.Value.Value)
 }
 
 func (suite *TypePortTestSuite) TestMarshalOk() {
-	testData := map[string]int{
-		"1":     1,
-		"1000":  1000,
-		"65535": 65535,
+	testStruct := &typePortTestStruct{
+		Value: config.TypePort{
+			Value: 10,
+		},
 	}
 
-	for k, v := range testData {
-		name := k
-		value := v
-
-		data, err := json.Marshal(map[string]int{
-			"value": value,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(name, func(t *testing.T) {
-			testStruct := &typePortTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, name, testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalJSON()
-			assert.NoError(t, err)
-			assert.Equal(t, name, string(marshalled))
-		})
-	}
+	data, err := json.Marshal(testStruct)
+	suite.NoError(err)
+	suite.JSONEq(`{"value":10}`, string(data))
 }
 
-func (suite *TypePortTestSuite) TestValue() {
-	testStruct := &typePortTestStruct{}
+func (suite *TypePortTestSuite) TestGet() {
+	value := config.TypePort{}
+	suite.EqualValues(10, value.Get(10))
 
-	suite.EqualValues(0, testStruct.Value.Value(0))
-	suite.EqualValues(1, testStruct.Value.Value(1))
-
-	data, err := json.Marshal(map[string]int{
-		"value": 5,
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.EqualValues(5, testStruct.Value.Value(0))
-	suite.EqualValues(5, testStruct.Value.Value(1))
+	value.Value = 100
+	suite.EqualValues(100, value.Get(10))
 }
 
 func TestTypePort(t *testing.T) {

internal/config/type_prefer_ip.go

@@ -6,45 +6,57 @@ import (
 )
 
 const (
+	// TypePreferIPPreferIPv4 states that you prefer to use IPv4 addresses
+	// but IPv6 is also possible.
 	TypePreferIPPreferIPv4 = "prefer-ipv4"
+
+	// TypePreferIPPreferIPv6 states that you prefer to use IPv6 addresses
+	// but IPv4 is also possible.
 	TypePreferIPPreferIPv6 = "prefer-ipv6"
-	TypePreferOnlyIPv4     = "only-ipv4"
-	TypePreferOnlyIPv6     = "only-ipv6"
+
+	// TypePreferOnlyIPv4 states that you prefer to use IPv4 addresses
+	// only.
+	TypePreferOnlyIPv4 = "only-ipv4"
+
+	// TypePreferOnlyIPv6 states that you prefer to use IPv6 addresses
+	// only.
+	TypePreferOnlyIPv6 = "only-ipv6"
 )
 
 type TypePreferIP struct {
-	value string
+	Value string
 }
 
-func (c *TypePreferIP) UnmarshalText(data []byte) error {
-	if len(data) == 0 {
+func (t *TypePreferIP) Set(value string) error {
+	value = strings.ToLower(value)
+
+	switch value {
+	case TypePreferIPPreferIPv4, TypePreferIPPreferIPv6,
+		TypePreferOnlyIPv4, TypePreferOnlyIPv6:
+		t.Value = value
+
 		return nil
-	}
-
-	text := strings.ToLower(string(data))
-
-	switch text {
-	case TypePreferIPPreferIPv4, TypePreferIPPreferIPv6, TypePreferOnlyIPv4, TypePreferOnlyIPv6:
-		c.value = text
 	default:
-		return fmt.Errorf("incorrect prefer-ip value: %s", string(data))
+		return fmt.Errorf("unsupported ip preference: %s", value)
 	}
-
-	return nil
 }
 
-func (c TypePreferIP) MarshalText() ([]byte, error) {
-	return []byte(c.value), nil
-}
-
-func (c *TypePreferIP) String() string {
-	return c.value
-}
-
-func (c *TypePreferIP) Value(defaultValue string) string {
-	if c.value == "" {
+func (t *TypePreferIP) Get(defaultValue string) string {
+	if t.Value == "" {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t *TypePreferIP) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypePreferIP) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypePreferIP) String() string {
+	return t.Value
 }

internal/config/type_prefer_ip_test.go

@@ -18,18 +18,12 @@ type TypePreferIPTestSuite struct {
 	suite.Suite
 }
 
-func (suite *TypePreferIPTestSuite) TestUnmarshalNil() {
-	typ := &config.TypePreferIP{}
-	suite.NoError(typ.UnmarshalText(nil))
-	suite.Empty(typ.String())
-}
-
 func (suite *TypePreferIPTestSuite) TestUnmarshalFail() {
 	testData := []string{
-		"p",
-		"ipv4",
-		"onlyipv4",
-		"ipv6prefer",
+		"",
+		"prefer",
+		"preferipv4",
+		config.TypePreferIPPreferIPv4 + "_",
 	}
 
 	for _, v := range testData {
@@ -50,14 +44,10 @@ func (suite *TypePreferIPTestSuite) TestUnmarshalOk() {
 		config.TypePreferIPPreferIPv6,
 		config.TypePreferOnlyIPv4,
 		config.TypePreferOnlyIPv6,
-		strings.ToUpper(config.TypePreferIPPreferIPv4),
-		strings.ToUpper(config.TypePreferIPPreferIPv6),
-		strings.ToUpper(config.TypePreferOnlyIPv4),
-		strings.ToUpper(config.TypePreferOnlyIPv6),
-		strings.ToLower(config.TypePreferIPPreferIPv4),
-		strings.ToLower(config.TypePreferIPPreferIPv6),
-		strings.ToLower(config.TypePreferOnlyIPv4),
-		strings.ToLower(config.TypePreferOnlyIPv6),
+		strings.ToTitle(config.TypePreferOnlyIPv4),
+		strings.ToTitle(config.TypePreferOnlyIPv6),
+		strings.ToTitle(config.TypePreferIPPreferIPv4),
+		strings.ToTitle(config.TypePreferIPPreferIPv6),
 	}
 
 	for _, v := range testData {
@@ -70,11 +60,8 @@ func (suite *TypePreferIPTestSuite) TestUnmarshalOk() {
 
 		suite.T().Run(v, func(t *testing.T) {
 			testStruct := &typePreferIPTestStruct{}
-
 			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.EqualValues(t,
-				strings.ToLower(value),
-				testStruct.Value.Value(config.TypePreferIPPreferIPv4))
+			assert.Equal(t, strings.ToLower(value), testStruct.Value.Value)
 		})
 	}
 }
@@ -85,55 +72,39 @@ func (suite *TypePreferIPTestSuite) TestMarshalOk() {
 		config.TypePreferIPPreferIPv6,
 		config.TypePreferOnlyIPv4,
 		config.TypePreferOnlyIPv6,
-		strings.ToUpper(config.TypePreferIPPreferIPv4),
-		strings.ToUpper(config.TypePreferIPPreferIPv6),
-		strings.ToUpper(config.TypePreferOnlyIPv4),
-		strings.ToUpper(config.TypePreferOnlyIPv6),
-		strings.ToLower(config.TypePreferIPPreferIPv4),
-		strings.ToLower(config.TypePreferIPPreferIPv6),
-		strings.ToLower(config.TypePreferOnlyIPv4),
-		strings.ToLower(config.TypePreferOnlyIPv6),
 	}
 
 	for _, v := range testData {
 		value := v
 
-		data, err := json.Marshal(map[string]string{
-			"value": v,
-		})
-		suite.NoError(err)
-
 		suite.T().Run(v, func(t *testing.T) {
-			testStruct := &typePreferIPTestStruct{}
+			testStruct := &typePreferIPTestStruct{
+				Value: config.TypePreferIP{
+					Value: value,
+				},
+			}
 
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, strings.ToLower(value), testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalText()
+			encodedJSON, err := json.Marshal(testStruct)
 			assert.NoError(t, err)
-			assert.Equal(t, strings.ToLower(value), string(marshalled))
+
+			expectedJSON, err := json.Marshal(map[string]string{
+				"value": value,
+			})
+			assert.NoError(t, err)
+
+			assert.JSONEq(t, string(expectedJSON), string(encodedJSON))
 		})
 	}
 }
 
-func (suite *TypePreferIPTestSuite) TestValue() {
-	testStruct := &typePreferIPTestStruct{}
+func (suite *TypePreferIPTestSuite) TestGet() {
+	value := config.TypePreferIP{}
+	suite.Equal(config.TypePreferIPPreferIPv4,
+		value.Get(config.TypePreferIPPreferIPv4))
 
-	suite.EqualValues(config.TypePreferIPPreferIPv4,
-		testStruct.Value.Value(config.TypePreferIPPreferIPv4))
-	suite.EqualValues(config.TypePreferIPPreferIPv6,
-		testStruct.Value.Value(config.TypePreferIPPreferIPv6))
-
-	data, err := json.Marshal(map[string]string{
-		"value": config.TypePreferOnlyIPv4,
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.EqualValues(config.TypePreferOnlyIPv4,
-		testStruct.Value.Value(config.TypePreferOnlyIPv6))
-	suite.EqualValues(config.TypePreferOnlyIPv4,
-		testStruct.Value.Value(config.TypePreferIPPreferIPv6))
+	suite.NoError(value.Set(config.TypePreferIPPreferIPv6))
+	suite.Equal(config.TypePreferIPPreferIPv6,
+		value.Get(config.TypePreferIPPreferIPv4))
 }
 
 func TestTypePreferIP(t *testing.T) {

internal/config/type_proxy_url.go

@@ -0,0 +1,65 @@
+package config
+
+import (
+	"fmt"
+	"net"
+	"net/url"
+)
+
+const typeProxyURLDefaultSOCKS5Port = "1080"
+
+type TypeProxyURL struct {
+	Value *url.URL
+}
+
+func (t *TypeProxyURL) 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)
+	}
+
+	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,
+		)
+	}
+
+	t.Value = parsedURL
+
+	return nil
+}
+
+func (t *TypeProxyURL) Get(defaultValue *url.URL) *url.URL {
+	if t.Value == nil {
+		return defaultValue
+	}
+
+	return t.Value
+}
+
+func (t *TypeProxyURL) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t TypeProxyURL) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t TypeProxyURL) String() string {
+	if t.Value == nil {
+		return ""
+	}
+
+	return t.Value.String()
+}

internal/config/type_proxy_url_test.go

@@ -0,0 +1,96 @@
+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 typeProxyURLTestStruct struct {
+	Value config.TypeProxyURL `json:"value"`
+}
+
+type ProxyURLTestSuite struct {
+	suite.Suite
+}
+
+func (suite *ProxyURLTestSuite) TestUnmarshalFail() {
+	testData := []string{
+		"",
+		"socks5://",
+		"://lala",
+		"/path",
+	}
+
+	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, &typeProxyURLTestStruct{}))
+		})
+	}
+}
+
+func (suite *ProxyURLTestSuite) TestUnmarshalOk() {
+	testData := map[string]string{
+		"socks5://127.0.0.1/?open_threshold=1": "socks5://127.0.0.1:1080/?open_threshold=1",
+		"socks5://127.0.0.1:80":                "socks5://127.0.0.1:80",
+	}
+
+	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 := &typeProxyURLTestStruct{}
+			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 *ProxyURLTestSuite) TestMarshalOk() {
+	parsed, _ := url.Parse("socks5://127.0.0.1:1080?open_threshold=1")
+	testStruct := &typeProxyURLTestStruct{
+		Value: config.TypeProxyURL{
+			Value: parsed,
+		},
+	}
+
+	encodedJSON, err := json.Marshal(testStruct)
+	suite.NoError(err)
+	suite.JSONEq(`{"value": "socks5://127.0.0.1:1080?open_threshold=1"}`,
+		string(encodedJSON))
+}
+
+func (suite *ProxyURLTestSuite) TestGet() {
+	emptyURL := &url.URL{}
+
+	value := config.TypeProxyURL{}
+	suite.Equal(emptyURL, value.Get(emptyURL))
+
+	value.Value = &url.URL{}
+	suite.Equal(value.Value, value.Get(emptyURL))
+}
+
+func TestTypeProxyURL(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &ProxyURLTestSuite{})
+}

internal/config/type_statsd_tag_format.go

@@ -6,44 +6,53 @@ import (
 )
 
 const (
+	// TypeStatsdTagFormatInfluxdb defines a tag format compatible with
+	// InfluxDB.
 	TypeStatsdTagFormatInfluxdb = "influxdb"
-	TypeStatsdTagFormatDatadog  = "datadog"
+
+	// TypeStatsdTagFormatDatadog defines a tag format compatible with
+	// DataDog.
+	TypeStatsdTagFormatDatadog = "datadog"
+
+	// TypeStatsdTagFormatGraphite defines a tag format compatible with
+	// Graphite.
 	TypeStatsdTagFormatGraphite = "graphite"
 )
 
 type TypeStatsdTagFormat struct {
-	value string
+	Value string
 }
 
-func (c *TypeStatsdTagFormat) UnmarshalText(data []byte) error {
-	if len(data) == 0 {
+func (t *TypeStatsdTagFormat) Set(value string) error {
+	lowercasedValue := strings.ToLower(value)
+
+	switch lowercasedValue {
+	case TypeStatsdTagFormatDatadog, TypeStatsdTagFormatInfluxdb,
+		TypeStatsdTagFormatGraphite:
+		t.Value = lowercasedValue
+
 		return nil
-	}
-
-	text := strings.ToLower(string(data))
-
-	switch text {
-	case TypeStatsdTagFormatInfluxdb, TypeStatsdTagFormatDatadog, TypeStatsdTagFormatGraphite:
-		c.value = text
 	default:
-		return fmt.Errorf("incorrect tag format value: %s", string(data))
+		return fmt.Errorf("unknown tag format %s", value)
 	}
-
-	return nil
 }
 
-func (c TypeStatsdTagFormat) MarshalText() ([]byte, error) {
-	return []byte(c.value), nil
-}
-
-func (c *TypeStatsdTagFormat) String() string {
-	return c.value
-}
-
-func (c *TypeStatsdTagFormat) Value(defaultValue string) string {
-	if c.value == "" {
+func (t TypeStatsdTagFormat) Get(defaultValue string) string {
+	if t.Value == "" {
 		return defaultValue
 	}
 
-	return c.value
+	return t.Value
+}
+
+func (t *TypeStatsdTagFormat) UnmarshalText(data []byte) error {
+	return t.Set(string(data))
+}
+
+func (t *TypeStatsdTagFormat) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+func (t *TypeStatsdTagFormat) String() string {
+	return t.Value
 }

internal/config/type_statsd_tag_format_test.go

@@ -14,22 +14,14 @@ type typeStatsdTagFormatTestStruct struct {
 	Value config.TypeStatsdTagFormat `json:"value"`
 }
 
-type TypeStatsdTagFormatTestSuite struct {
+type StatsdTagFormatTestSuite struct {
 	suite.Suite
 }
 
-func (suite *TypeStatsdTagFormatTestSuite) TestUnmarshalNil() {
-	typ := &config.TypeStatsdTagFormat{}
-	suite.NoError(typ.UnmarshalText(nil))
-	suite.Equal("lalala", typ.Value("lalala"))
-}
-
-func (suite *TypeStatsdTagFormatTestSuite) TestUnmarshalFail() {
+func (suite *StatsdTagFormatTestSuite) TestUnmarshalFail() {
 	testData := []string{
-		"p",
-		"ipv4",
-		"onlyipv4",
-		"ipv6prefer",
+		"",
+		"dogdog",
 	}
 
 	for _, v := range testData {
@@ -44,17 +36,14 @@ func (suite *TypeStatsdTagFormatTestSuite) TestUnmarshalFail() {
 	}
 }
 
-func (suite *TypeStatsdTagFormatTestSuite) TestUnmarshalOk() {
+func (suite *StatsdTagFormatTestSuite) TestUnmarshalOk() {
 	testData := []string{
-		config.TypeStatsdTagFormatDatadog,
 		config.TypeStatsdTagFormatInfluxdb,
 		config.TypeStatsdTagFormatGraphite,
-		strings.ToUpper(config.TypeStatsdTagFormatDatadog),
+		config.TypeStatsdTagFormatDatadog,
 		strings.ToUpper(config.TypeStatsdTagFormatInfluxdb),
 		strings.ToUpper(config.TypeStatsdTagFormatGraphite),
-		strings.ToLower(config.TypeStatsdTagFormatDatadog),
-		strings.ToLower(config.TypeStatsdTagFormatInfluxdb),
-		strings.ToLower(config.TypeStatsdTagFormatGraphite),
+		strings.ToUpper(config.TypeStatsdTagFormatDatadog),
 	}
 
 	for _, v := range testData {
@@ -67,70 +56,53 @@ func (suite *TypeStatsdTagFormatTestSuite) TestUnmarshalOk() {
 
 		suite.T().Run(v, func(t *testing.T) {
 			testStruct := &typeStatsdTagFormatTestStruct{}
-
 			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.EqualValues(t,
-				strings.ToLower(value),
-				testStruct.Value.Value(config.TypeStatsdTagFormatDatadog))
+			assert.Equal(t, strings.ToLower(value), testStruct.Value.Value)
 		})
 	}
 }
 
-func (suite *TypeStatsdTagFormatTestSuite) TestMarshalOk() {
+func (suite *StatsdTagFormatTestSuite) TestMarshalOk() {
 	testData := []string{
-		config.TypeStatsdTagFormatDatadog,
 		config.TypeStatsdTagFormatInfluxdb,
 		config.TypeStatsdTagFormatGraphite,
-		strings.ToUpper(config.TypeStatsdTagFormatDatadog),
-		strings.ToUpper(config.TypeStatsdTagFormatInfluxdb),
-		strings.ToUpper(config.TypeStatsdTagFormatGraphite),
-		strings.ToLower(config.TypeStatsdTagFormatDatadog),
-		strings.ToLower(config.TypeStatsdTagFormatInfluxdb),
-		strings.ToLower(config.TypeStatsdTagFormatGraphite),
+		config.TypeStatsdTagFormatDatadog,
 	}
 
 	for _, v := range testData {
 		value := v
 
-		data, err := json.Marshal(map[string]string{
-			"value": v,
-		})
-		suite.NoError(err)
-
 		suite.T().Run(v, func(t *testing.T) {
-			testStruct := &typeStatsdTagFormatTestStruct{}
+			testStruct := &typeStatsdTagFormatTestStruct{
+				Value: config.TypeStatsdTagFormat{
+					Value: value,
+				},
+			}
 
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, strings.ToLower(value), testStruct.Value.String())
-
-			marshalled, err := testStruct.Value.MarshalText()
+			encodedJSON, err := json.Marshal(testStruct)
 			assert.NoError(t, err)
-			assert.Equal(t, strings.ToLower(value), string(marshalled))
+
+			expectedJSON, err := json.Marshal(map[string]string{
+				"value": value,
+			})
+			assert.NoError(t, err)
+
+			assert.JSONEq(t, string(expectedJSON), string(encodedJSON))
 		})
 	}
 }
 
-func (suite *TypeStatsdTagFormatTestSuite) TestValue() {
-	testStruct := &typePreferIPTestStruct{}
+func (suite *StatsdTagFormatTestSuite) TestGet() {
+	value := config.TypeStatsdTagFormat{}
+	suite.Equal(config.TypeStatsdTagFormatDatadog,
+		value.Get(config.TypeStatsdTagFormatDatadog))
 
-	suite.EqualValues(config.TypePreferIPPreferIPv4,
-		testStruct.Value.Value(config.TypePreferIPPreferIPv4))
-	suite.EqualValues(config.TypePreferIPPreferIPv6,
-		testStruct.Value.Value(config.TypePreferIPPreferIPv6))
-
-	data, err := json.Marshal(map[string]string{
-		"value": config.TypePreferOnlyIPv4,
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.EqualValues(config.TypePreferOnlyIPv4,
-		testStruct.Value.Value(config.TypePreferOnlyIPv6))
-	suite.EqualValues(config.TypePreferOnlyIPv4,
-		testStruct.Value.Value(config.TypePreferIPPreferIPv6))
+	suite.NoError(value.Set(config.TypeStatsdTagFormatInfluxdb))
+	suite.Equal(config.TypeStatsdTagFormatInfluxdb,
+		value.Get(config.TypeStatsdTagFormatDatadog))
 }
 
 func TestTypeStatsdTagFormat(t *testing.T) {
 	t.Parallel()
-	suite.Run(t, &TypeStatsdTagFormatTestSuite{})
+	suite.Run(t, &StatsdTagFormatTestSuite{})
 }

internal/config/type_url.go

@@ -1,71 +0,0 @@
-package config
-
-import (
-	"fmt"
-	"net"
-	"net/url"
-)
-
-type TypeURL struct {
-	value *url.URL
-}
-
-func (c *TypeURL) UnmarshalText(data []byte) error { // nolint: cyclop
-	if len(data) == 0 {
-		return nil
-	}
-
-	value, err := url.Parse(string(data))
-	if err != nil {
-		return fmt.Errorf("incorrect URL: %w", err)
-	}
-
-	switch value.Scheme {
-	case "http", "https", "socks5":
-	case "":
-		return fmt.Errorf("url %s has to have a schema", value)
-	default:
-		return fmt.Errorf("unsupported schema %s", value.Scheme)
-	}
-
-	if value.Host == "" {
-		return fmt.Errorf("url %s has to have a host", value)
-	}
-
-	if _, _, err := net.SplitHostPort(value.Host); err != nil {
-		switch value.Scheme {
-		case "http":
-			value.Host = net.JoinHostPort(value.Host, "80")
-		case "https":
-			value.Host = net.JoinHostPort(value.Host, "443")
-		case "socks5":
-			value.Host = net.JoinHostPort(value.Host, "1080")
-		default:
-			return fmt.Errorf("cannot set a default port for %s", value)
-		}
-	}
-
-	c.value = value
-
-	return nil
-}
-
-func (c *TypeURL) MarshalText() ([]byte, error) {
-	return []byte(c.String()), nil
-}
-
-func (c TypeURL) String() string {
-	if c.value == nil {
-		return ""
-	}
-
-	return c.value.String()
-}
-
-func (c TypeURL) Value(defaultValue *url.URL) *url.URL {
-	if c.value == nil {
-		return defaultValue
-	}
-
-	return c.value
-}

internal/config/type_url_test.go

@@ -1,107 +0,0 @@
-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 typeURLTestStruct struct {
-	Value config.TypeURL `json:"value"`
-}
-
-type TypeURLTestSuite struct {
-	suite.Suite
-}
-
-func (suite *TypeURLTestSuite) TestUnmarshalNil() {
-	u, _ := url.Parse("https://google.com")
-
-	typ := &config.TypeURL{}
-	suite.NoError(typ.UnmarshalText(nil))
-	suite.Empty(typ.String())
-	suite.Equal("https://google.com", typ.Value(u).String())
-}
-
-func (suite *TypeURLTestSuite) TestUnmarshalFail() {
-	testData := []string{
-		"http:/aaa.com",
-		"ipv4",
-		"111",
-		"://111",
-		"http://aaa.com:xxx",
-		"gopher://aaa.com:888",
-		"gopher://aaa.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, &typeURLTestStruct{}))
-		})
-	}
-}
-
-func (suite *TypeURLTestSuite) TestUnmarshalOk() {
-	testData := map[string]string{
-		"https://10.0.0.10:80":    "https://10.0.0.10:80",
-		"https://10.0.0.10:443":   "https://10.0.0.10",
-		"http://10.0.0.10:8":      "http://10.0.0.10:8",
-		"http://10.0.0.10:80":     "http://10.0.0.10",
-		"socks5://10.0.0.10:1080": "socks5://10.0.0.10",
-		"socks5://10.0.0.10:888":  "socks5://10.0.0.10:888",
-	}
-
-	for k, v := range testData {
-		expected := k
-		actual := v
-
-		data, err := json.Marshal(map[string]string{
-			"value": actual,
-		})
-		suite.NoError(err)
-
-		suite.T().Run(actual, func(t *testing.T) {
-			testStruct := &typeURLTestStruct{}
-
-			assert.NoError(t, json.Unmarshal(data, testStruct))
-			assert.Equal(t, expected, testStruct.Value.Value(nil).String())
-
-			marshalled, err := testStruct.Value.MarshalText()
-			assert.NoError(t, err)
-			assert.Equal(t, expected, string(marshalled))
-		})
-	}
-}
-
-func (suite *TypeURLTestSuite) TestValue() {
-	testStruct := &typeURLTestStruct{}
-
-	u1, _ := url.Parse("https://10.0.0.10:80")
-	u2, _ := url.Parse("https://10.1.0.10:80")
-
-	suite.Equal("https://10.0.0.10:80", testStruct.Value.Value(u1).String())
-	suite.Equal("https://10.1.0.10:80", testStruct.Value.Value(u2).String())
-
-	data, err := json.Marshal(map[string]string{
-		"value": "http://127.0.0.1:80",
-	})
-	suite.NoError(err)
-	suite.NoError(json.Unmarshal(data, testStruct))
-
-	suite.Equal("http://127.0.0.1:80", testStruct.Value.Value(u1).String())
-	suite.Equal("http://127.0.0.1:80", testStruct.Value.Value(u2).String())
-}
-
-func TestTypeURL(t *testing.T) {
-	t.Parallel()
-	suite.Run(t, &TypeURLTestSuite{})
-}

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

@@ -5,6 +5,7 @@ import (
 	"net"
 	"net/http"
 
+	"github.com/9seconds/mtg/v2/essentials"
 	"github.com/stretchr/testify/mock"
 )
 
@@ -12,19 +13,24 @@ type MtglibNetworkMock struct {
 	mock.Mock
 }
 
-func (m *MtglibNetworkMock) Dial(network, address string) (net.Conn, error) {
+func (m *MtglibNetworkMock) Dial(network, address string) (essentials.Conn, error) {
 	args := m.Called(network, address)
 
-	return args.Get(0).(net.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) (net.Conn, error) {
+func (m *MtglibNetworkMock) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
 	args := m.Called(ctx, network, address)
 
-	return args.Get(0).(net.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) (net.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

@@ -7,42 +7,50 @@ import (
 	"github.com/stretchr/testify/mock"
 )
 
-type NetConnMock struct {
+type EssentialsConnMock struct {
 	mock.Mock
 }
 
-func (n *NetConnMock) Read(b []byte) (int, error) {
+func (n *EssentialsConnMock) Read(b []byte) (int, error) {
 	args := n.Called(b)
 
 	return args.Int(0), args.Error(1)
 }
 
-func (n *NetConnMock) Write(b []byte) (int, error) {
+func (n *EssentialsConnMock) Write(b []byte) (int, error) {
 	args := n.Called(b)
 
 	return args.Int(0), args.Error(1)
 }
 
-func (n *NetConnMock) Close() error {
-	return n.Called().Error(0) // nolint: wrapcheck
+func (n *EssentialsConnMock) Close() error {
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
-func (n *NetConnMock) LocalAddr() net.Addr {
-	return n.Called().Get(0).(net.Addr)
+func (n *EssentialsConnMock) CloseRead() error {
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
-func (n *NetConnMock) RemoteAddr() net.Addr {
-	return n.Called().Get(0).(net.Addr)
+func (n *EssentialsConnMock) CloseWrite() error {
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
-func (n *NetConnMock) SetDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+func (n *EssentialsConnMock) LocalAddr() net.Addr {
+	return n.Called().Get(0).(net.Addr) //nolint: forcetypeassert
 }
 
-func (n *NetConnMock) SetReadDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+func (n *EssentialsConnMock) RemoteAddr() net.Addr {
+	return n.Called().Get(0).(net.Addr) //nolint: forcetypeassert
 }
 
-func (n *NetConnMock) SetWriteDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+func (n *EssentialsConnMock) SetDeadline(t time.Time) error {
+	return n.Called(t).Error(0) //nolint: wrapcheck
+}
+
+func (n *EssentialsConnMock) SetReadDeadline(t time.Time) error {
+	return n.Called(t).Error(0) //nolint: wrapcheck
+}
+
+func (n *EssentialsConnMock) SetWriteDeadline(t time.Time) error {
+	return n.Called(t).Error(0) //nolint: wrapcheck
 }

internal/utils/make_qr_code_url.go

@@ -0,0 +1,19 @@
+package utils
+
+import "net/url"
+
+func MakeQRCodeURL(data string) string {
+	values := url.Values{}
+	values.Set("qzone", "4")
+	values.Set("format", "svg")
+	values.Set("data", data)
+
+	rv := url.URL{
+		Scheme:   "https",
+		Host:     "api.qrserver.com",
+		Path:     "/v1/create-qr-code",
+		RawQuery: values.Encode(),
+	}
+
+	return rv.String()
+}

internal/utils/make_qr_code_url_test.go

@@ -0,0 +1,31 @@
+package utils_test
+
+import (
+	"net/url"
+	"strings"
+	"testing"
+
+	"github.com/9seconds/mtg/v2/internal/utils"
+	"github.com/stretchr/testify/suite"
+)
+
+type MakeQRCodeURLTestSuite struct {
+	suite.Suite
+}
+
+func (suite *MakeQRCodeURLTestSuite) TestSomeData() {
+	value := utils.MakeQRCodeURL("some data")
+
+	parsed, err := url.Parse(value)
+	suite.NoError(err)
+
+	suite.Equal("some data", parsed.Query().Get("data"))
+	suite.Equal("svg", parsed.Query().Get("format"))
+	suite.Equal("api.qrserver.com", strings.TrimPrefix(parsed.Host, "www."))
+	suite.Equal("v1/create-qr-code", strings.Trim(parsed.Path, "/"))
+}
+
+func TestMakeQRCodeURL(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &MakeQRCodeURLTestSuite{})
+}

internal/utils/net_listener.go

@@ -0,0 +1,38 @@
+package utils
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/9seconds/mtg/v2/network"
+)
+
+type Listener struct {
+	net.Listener
+}
+
+func (l Listener) Accept() (net.Conn, error) {
+	conn, err := l.Listener.Accept()
+	if err != nil {
+		return nil, err //nolint: wrapcheck
+	}
+
+	if err := network.SetClientSocketOptions(conn, 0); err != nil {
+		conn.Close() //nolint: errcheck
+
+		return nil, fmt.Errorf("cannot set TCP options: %w", err)
+	}
+
+	return conn, nil
+}
+
+func NewListener(bindTo string, bufferSize int) (net.Listener, error) {
+	base, err := net.Listen("tcp", bindTo)
+	if err != nil {
+		return nil, fmt.Errorf("cannot build a base listener: %w", err)
+	}
+
+	return Listener{
+		Listener: base,
+	}, nil
+}

internal/utils/read_config.go

@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/9seconds/mtg/v2/internal/config"
+)
+
+func ReadConfig(path string) (*config.Config, error) {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("cannot read config file: %w", err)
+	}
+
+	conf, err := config.Parse(content)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse config: %w", err)
+	}
+
+	if err := conf.Validate(); err != nil {
+		return nil, fmt.Errorf("invalid config: %w", err)
+	}
+
+	return conf, nil
+}

internal/utils/read_config_test.go

@@ -0,0 +1,55 @@
+package utils_test
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/9seconds/mtg/v2/internal/utils"
+	"github.com/stretchr/testify/suite"
+)
+
+type ReadConfigTestSuite struct {
+	suite.Suite
+}
+
+func (suite *ReadConfigTestSuite) GetConfigPath(filename string) string {
+	return filepath.Join("testdata", filename)
+}
+
+func (suite *ReadConfigTestSuite) TestReadMinimal() {
+	conf, err := utils.ReadConfig(suite.GetConfigPath("minimal.toml"))
+	suite.NoError(err)
+	suite.NoError(conf.Validate())
+	suite.Equal("0.0.0.0:80", conf.BindTo.Get(""))
+	suite.Equal("7mqFMMq3P2Tvvt_rPx5qhmFnb29nbGUuY29t", conf.Secret.Base64())
+}
+
+func (suite *ReadConfigTestSuite) TestReadAbsentFile() {
+	_, err := utils.ReadConfig(suite.GetConfigPath("unknown.file"))
+	suite.Error(err)
+}
+
+func (suite *ReadConfigTestSuite) TestBrokenFile() {
+	_, err := utils.ReadConfig(suite.GetConfigPath("broken.toml"))
+	suite.Error(err)
+}
+
+func (suite *ReadConfigTestSuite) TestMissedBindTo() {
+	_, err := utils.ReadConfig(suite.GetConfigPath("missed-bindto.toml"))
+	suite.Error(err)
+}
+
+func (suite *ReadConfigTestSuite) TestMissedSecret() {
+	_, err := utils.ReadConfig(suite.GetConfigPath("missed-secret.toml"))
+	suite.Error(err)
+}
+
+func (suite *ReadConfigTestSuite) TestEmpty() {
+	_, err := utils.ReadConfig(suite.GetConfigPath("empty.toml"))
+	suite.Error(err)
+}
+
+func TestReadConfig(t *testing.T) {
+	t.Parallel()
+	suite.Run(t, &ReadConfigTestSuite{})
+}

internal/utils/rlimit.go

@@ -1,24 +0,0 @@
-// +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

@@ -1,7 +0,0 @@
-// +build windows
-
-package utils
-
-func SetLimits() error {
-	return nil
-}

internal/utils/root_context.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package utils

internal/utils/root_context_windows.go

@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 package utils

internal/utils/testdata/broken.toml

@@ -0,0 +1 @@
+11

internal/utils/testdata/missed-bindto.toml

@@ -0,0 +1,2 @@
+
+secret = "7mqFMMq3P2Tvvt_rPx5qhmFnb29nbGUuY29t"