Merge branch 'stable' into v2

Add support of proxy protocol

.github/workflows/ci.yaml

@@ -38,36 +38,40 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
-    timeout-minutes: 5
+    timeout-minutes: 10
-    strategy:
-      matrix:
-        go_version:
-          - ^1.17
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
-      - name: Setup Go
+      - uses: jdx/mise-action@v3
-        uses: actions/setup-go@v2
+        name: Install mise
-        with:
-          go-version: ${{ matrix.go_version }}
-
-      - name: Cache dependencies
-        uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          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: Run fuzzing
+        run: mise tasks run 'test:fuzz:*'
+
 
   lint:
     name: Lint
@@ -75,40 +79,52 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
+      - uses: jdx/mise-action@v3
+        name: Install mise
+
       - name: Run linter
-        uses: golangci/golangci-lint-action@v2
+        run: mise tasks run lint
-        with:
-          version: v1.44.2
 
   docker:
     name: Docker
     runs-on: ubuntu-latest
     timeout-minutes: 20
+    permissions:
+      contents: read
+      packages: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
       - name: Get Docker meta
-        id: docker_meta
+        id: meta
-        uses: crazy-max/ghaction-docker-meta@v1
+        uses: docker/metadata-action@v5
         with:
-          images: nineseconds/mtg,ghcr.io/9seconds/mtg
+          images: |
-          tag-semver: "{{version}},{{major}},{{major}}.{{minor}}"
+            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
+        uses: docker/setup-buildx-action@v3
 
       - name: Setup cache
-        uses: actions/cache@v2
+        uses: actions/cache@v5
         with:
           path: /tmp/buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}
@@ -117,18 +133,18 @@ jobs:
 
       - 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 }}
+          username: ${{ github.actor }}
-          password: ${{ secrets.GH_PAT }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
         uses: docker/build-push-action@v2
@@ -137,7 +153,7 @@ jobs:
           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 }}
+          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.docker_meta.outputs.labels }}
+          labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=local,src=/tmp/buildx-cache
           cache-to: type=local,dest=/tmp/buildx-cache

.gitignore

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

.golangci.toml

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

.goreleaser.yml

@@ -1,5 +1,7 @@
 ---
 
+version: 2
+
 project_name: mtg
 
 before:
@@ -41,11 +43,13 @@ builds:
 
 archives:
   - name_template: '{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
-    format: tar.gz
+    formats:
+      - tar.gz
     wrap_in_directory: true
     format_overrides:
       - goos: windows
-        format: zip
+        formats:
+          - zip
     files:
       - LICENSE
       - README.md
@@ -55,7 +59,7 @@ gomod:
   proxy: true
 
 snapshot:
-  name_template: '{{ .Version }}'
+  version_template: '{{ .Version }}'
 
 checksum:
   name_template: '{{ .ProjectName }}-{{ .Version }}-checksums.txt'

.mise.toml

@@ -0,0 +1,101 @@
+[tools]
+"go:golang.org/x/pkgsite/cmd/pkgsite" = "latest"
+"go:golang.org/x/tools/gopls" = "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=1.25"
+]
+
+[tasks.lint]
+description = "Run linter"
+run = "golangci-lint run"
+
+[tasks.test]
+description = "Run tests"
+run = "go test -v ./..."
+
+[tasks.covtest]
+description = "Run tests with code coverage"
+run = "go test -coverprofile=coverage.txt -covermode=atomic -parallel 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=FuzzClientHello ./mtglib/internal/faketls"
+
+[tasks."test:fuzz:client-handshake"]
+description = "Run fuzzy test for ClientHandshake"
+run = "go test -v {{ vars.fuzzflags }} -fuzz=FuzzClientHandshake ./mtglib/internal/obfuscated2"
+
+[tasks."test:fuzz:server-generate-handshake-frame"]
+description = "Run fuzzy test for ServerGenerateHandshakeFrame"
+run = "go test -v {{ vars.fuzzflags }} -fuzz=FuzzServerGenerateHandshakeFrame ./mtglib/internal/obfuscated2"
+
+[tasks."test:fuzz:server-receive"]
+description = "Run fuzzy test for ServerReceive"
+run = "go test -v {{ vars.fuzzflags }} -fuzz=FuzzServerReceive ./mtglib/internal/obfuscated2"
+
+[tasks."test:fuzz:server-send"]
+description = "Run fuzzy test for ServerSend"
+run = "go test -v {{ vars.fuzzflags }} -fuzz=FuzzServerSend ./mtglib/internal/obfuscated2"
+
+[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 ."

Dockerfile

@@ -1,21 +1,27 @@
 ###############################################################################
 # BUILD STAGE
 
-FROM golang:1.17-alpine AS build
+FROM golang:1.26-alpine AS build
+
+ENV CGO_ENABLED=0
 
 RUN set -x \
   && apk --no-cache --update add \
     bash \
     ca-certificates \
-    curl \
+    git
-    git \
-    make
 
 COPY . /app
 WORKDIR /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
 
 
 ###############################################################################

Makefile

@@ -1,98 +0,0 @@
-ROOT_DIR     := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
-IMAGE_NAME   := mtg
-APP_NAME     := $(IMAGE_NAME)
-
-GOLANGCI_LINT_VERSION := v1.44.2
-
-VERSION_GO         := $(shell go version)
-VERSION_DATE       := $(shell date -Ru)
-VERSION_TAG        := $(shell git describe --tags --always)
-COMMON_BUILD_FLAGS := -trimpath -mod=readonly -ldflags="-extldflags '-static' -s -w -X 'main.version=$(VERSION_TAG) ($(VERSION_GO)) [$(VERSION_DATE)]'"
-
-GOBIN  := $(ROOT_DIR)/.bin
-GOTOOL := env "GOBIN=$(GOBIN)" "PATH=$(ROOT_DIR)/.bin:$(PATH)"
-
-# -----------------------------------------------------------------------------
-
-.PHONY: all
-all: build
-
-.PHONY: build
-build:
-	@go build $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
-
-$(APP_NAME): build
-
-.PHONY: static
-static:
-	@env CGO_ENABLED=0 GOOS=linux go build \
-		$(COMMON_BUILD_FLAGS) \
-		-tags netgo \
-		-a \
-		-o "$(APP_NAME)"
-
-vendor: go.mod go.sum
-	@$(MOD_ON) go mod vendor
-
-.bin:
-	@mkdir -p "$(GOBIN)" || true
-
-.PHONY: fmt
-fmt:
-	@$(GOTOOL) gofumpt -w -extra "$(ROOT_DIR)"
-
-.PHONY: test
-test:
-	@go test -v ./...
-
-.PHONY: citest
-citest:
-	@go test -coverprofile=coverage.txt -covermode=atomic -parallel 2 -race -v ./...
-
-.PHONY: clean
-clean:
-	@git clean -xfd && \
-		git reset --hard >/dev/null && \
-		git submodule foreach --recursive sh -c 'git clean -xfd && git reset --hard' >/dev/null
-
-.PHONY: lint
-lint:
-	@$(GOTOOL) golangci-lint run
-
-.PHONY: release
-release:
-	@$(GOTOOL) goreleaser release --snapshot --rm-dist && \
-		find "$(ROOT_DIR)/dist" -type d | grep -vP "dist$$" | xargs -r rm -rf && \
-		rm -f "$(ROOT_DIR)/dist/config.yaml"
-
-.PHONY: docker
-docker:
-	@docker build --pull -t "$(IMAGE_NAME)" "$(ROOT_DIR)"
-
-.PHONY: doc
-doc:
-	@$(GOTOOL) godoc -http 0.0.0.0:10000
-
-.PHONY: install-tools
-install-tools: install-tools-lint install-tools-godoc install-tools-gofumpt install-tools-goreleaser
-
-.PHONY: install-tools-lint
-install-tools-lint: .bin
-	@curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh \
-		| bash -s -- -b "$(GOBIN)" "$(GOLANGCI_LINT_VERSION)"
-
-.PHONY: install-tools-godoc
-install-tools-godoc: .bin
-	@$(GOTOOL) go install golang.org/x/tools/cmd/godoc@latest
-
-.PHONY: install-tools-gofumpt
-install-tools-gofumpt: .bin
-	@$(GOTOOL) go install mvdan.cc/gofumpt@latest
-
-.PHONY: goreleaser
-install-tools-goreleaser: .bin
-	@$(GOTOOL) go install github.com/goreleaser/goreleaser@latest
-
-.PHONY: update-deps
-update-deps:
-	@go get -u && go mod tidy -go=1.17

README.md

@@ -10,6 +10,17 @@ Highly-opinionated (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
@@ -40,6 +52,12 @@ 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
@@ -162,6 +180,12 @@ This project has several main branches
 
 ## Getting started
 
+### Download mise
+
+mtg uses [mise](https://mise.jdx.dev/) to maintain its development
+dependencies + replaces a make for building things. Please
+[install](https://mise.jdx.dev/getting-started.html) it first.
+
 ### Download a tool
 
 #### Download binaries
@@ -190,7 +214,7 @@ surprises. Always choose some version tag.
 Also, if you have `go` installed, you can always download this tool with `go get`:
 
 ```console
-go get github.com/9seconds/mtg/v2
+go install github.com/9seconds/mtg/v2@latest
 ```
 
 #### Build from sources
@@ -198,13 +222,14 @@ go get github.com/9seconds/mtg/v2
 ```console
 git clone https://github.com/9seconds/mtg.git
 cd mtg
-make static
+mise install
+mise tasks run build
 ```
 
 or for the docker image:
 
 ```console
-make docker
+mise tasks run image
 ```
 
 ### Generate secret
@@ -275,7 +300,7 @@ Flags:
   -b, --tcp-buffer="4KB"               Size of TCP buffer to use.
   -i, --prefer-ip="prefer-ipv6"        IP preference. By default we prefer IPv6 with fallback to IPv4.
   -p, --domain-fronting-port=443       A port to access for domain fronting.
-  -n, --doh-ip=9.9.9.9                 IP address of DNS-over-HTTP to use.
+  -n, --doh-ip=1.1.1.1                 IP address of DNS-over-HTTP to use.
   -t, --timeout=10s                    Network timeout to use
   -a, --antireplay-cache-size="1MB"    A size of anti-replay cache to use.
 ```
@@ -317,12 +342,16 @@ 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
+AmbientCapabilities=CAP_NET_BIND_SERVICE
 
 [Install]
 WantedBy=multi-user.target
@@ -334,7 +363,7 @@ $ sudo systemctl start mtg
 or you can run a docker image
 
 ```console
-docker run -d -v /etc/mtg.toml:/config.toml -p 443:3128 --name mtg-proxy --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
@@ -388,7 +417,7 @@ Here goes a list of metrics with their types but without a prefix.
 | 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:

antireplay/init.go

@@ -1,17 +1,17 @@
-// Antireplay package has cache implementations that are effective
+// Antireplay package has cache implementations that are effective against
-// against replay attacks.
+// replay attacks.
 //
-// To understand more about replay attacks, please read documentation
+// To understand more about replay attacks, please read documentation for
-// for mtglib.AntiReplayCache interface. This package has a list of some
+// [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
+	// DefaultStableBloomFilterMaxSize is a recommended byte size for a stable
-	// stable bloom filter.
+	// bloom filter.
 	DefaultStableBloomFilterMaxSize = 1024 * 1024 // 1MiB
 
-	// DefaultStableBloomFilterErrorRate is a recommended default error
+	// DefaultStableBloomFilterErrorRate is a recommended default error rate for a
-	// rate for a stable bloom filter.
+	// 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
+// NewNoop returns an implementation that does nothing. A corresponding method
-// method always returns false, so this cache accepts everything you
+// always returns false, so this cache accepts everything you pass to it.
-// 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
+// NewStableBloomFilter returns an implementation of AntiReplayCache based on
-// based on stable bloom filter.
+// 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
+// The basic idea of a stable bloom filter is quite simple: each time when you
-// when you set a new element, you randomly reset P elements. There is a
+// set a new element, you randomly reset P elements. There is a hardcore math
-// hardcore math which proves that if you choose this P correctly, you
+// which proves that if you choose this P correctly, you can maintain the same
-// can maintain the same error rate for a stream of elements.
+// 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
+// errorRate is desired false-positive error rate. If you want to use default
-// default values, please pass 0 for byteSize and <0 for errorRate.
+// 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/conns.go

@@ -5,19 +5,19 @@ import (
 	"net"
 )
 
-// CloseableReader is a reader interface that can close its reading end.
+// CloseableReader is an [io.Reader] interface that can close its reading end.
 type CloseableReader interface {
 	io.Reader
 	CloseRead() error
 }
 
-// CloseableWriter is a writer that can close its writing end.
+// CloseableWriter is an [io.Writer] that can close its writing end.
 type CloseableWriter interface {
 	io.Writer
 	CloseWrite() error
 }
 
-// Conn is an extension of net.Conn that can close its ends. This mostly
+// Conn is an extension of [net.Conn] that can close its ends. This mostly
 // implies TCP connections.
 type Conn interface {
 	net.Conn

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 {

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
+// Please see documentation for [mtglib.EventStream] interface to get an idea
-// idea of such an abstraction. This package has implementations for the
+// of such an abstraction. This package has implementations for the default
-// default event stream.
+// event stream.
 //
-// Default event stream has a list of its own concepts. First, all it
+// Default event stream has a list of its own concepts. First, all it does is a
-// does is a routing of messages to known observers. It takes an event,
+// routing of messages to known observers. It takes an event, defines its type
-// defines its type and pass this message to a method of the observer.
+// and pass this message to a method of the observer.
 //
-// There might be many observers, but default event stream has a
+// There might be many observers, but default event stream has a guarantee
-// guarantee though. It uses StreamID as a sharding key and guarantees
+// though. It uses StreamID as a sharding key and guarantees that a message
-// that a message with the same StreamID will be devlivered to the same
+// with the same StreamID will be devlivered to the same observer instance. So,
-// observer instance. So, each producer is guarateed to get all relevant
+// each producer is guarateed to get all relevant messages related to the same
-// messages related to the same session. It is not possible that it will
+// session. It is not possible that it will get EventFinish if it has not seen
-// get EventFinish if it has not seen EventStart for that session yet.
+// 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
+// guarantees that all events with the same StreamID are going to be routed to
-// routed to the same instance of the observer. So, there is no need
+// the same instance of the observer. So, there is no need to synchronize
-// to synchronize information about streams between many observers
+// information about streams between many observers instances, they can have
-// instances, they can have their local storage.
+// their local storage.
 type Observer interface {
 	// EventStart reacts on incoming mtglib.EventStart event.
 	EventStart(mtglib.EventStart)
@@ -65,8 +65,8 @@ type Observer interface {
 
 // ObserverFactory creates a new instance of the observer.
 //
-// Default event stream creates a small set of goroutines to manage
+// Default event stream creates a small set of goroutines to manage incoming
-// incoming messages. Each message is routed to an appropriate observer
+// messages. Each message is routed to an appropriate observer based on a
-// based on a sharding key, stream id. So, it is possible that an
+// sharding key, stream id. So, it is possible that an instance of mtg will
-// instance of mtg will have many observer instances, not a single one.
+// have many observer instances, not a single one.
 type ObserverFactory func() Observer

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) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventStart(evt)
-
+		})
-			obs.EventStart(evt)
-		}(v)
 	}
 
 	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) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventConnectedToDC(evt)
-
+		})
-			obs.EventConnectedToDC(evt)
-		}(v)
 	}
 
 	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) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventDomainFronting(evt)
-
+		})
-			obs.EventDomainFronting(evt)
-		}(v)
 	}
 
 	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) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventTraffic(evt)
-
+		})
-			obs.EventTraffic(evt)
-		}(v)
 	}
 
 	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) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventFinish(evt)
-
+		})
-			obs.EventFinish(evt)
-		}(v)
 	}
 
 	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) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventConcurrencyLimited(evt)
-
+		})
-			obs.EventConcurrencyLimited(evt)
-		}(v)
 	}
 
 	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) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventIPBlocklisted(evt)
-
+		})
-			obs.EventIPBlocklisted(evt)
-		}(v)
 	}
 
 	wg.Wait()
@@ -117,14 +96,11 @@ 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) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventReplayAttack(evt)
-
+		})
-			obs.EventReplayAttack(evt)
-		}(v)
 	}
 
 	wg.Wait()
@@ -132,14 +108,11 @@ func (m multiObserver) EventReplayAttack(evt mtglib.EventReplayAttack) {
 
 func (m multiObserver) EventIPListSize(evt mtglib.EventIPListSize) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
+		wg.Go(func() {
-			defer wg.Done()
+			v.EventIPListSize(evt)
-
+		})
-			obs.EventIPListSize(evt)
-		}(v)
 	}
 
 	wg.Wait()

example.config.toml

@@ -23,6 +23,15 @@ 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
@@ -71,6 +80,15 @@ tolerate-time-skewness = "5s"
 # Otherwise, chose a new DC.
 allow-fallback-on-unknown-dc = false
 
+# Telegram uses different DCs for different purposes. Unfortunately, most of
+# DCs are not public, and dependent on a location of the current user, so
+# mtg cannot know upfront about all of them, and how to access them. It has
+# a default list of DCs, including some CDN IPs, but it is possible that some
+# of them are not working for you. In this case, you can override them here.
+[[dc-overrides]]
+dc = 101
+ips = ["127.0.0.1:443"]
+
 # network defines different network-related settings
 [network]
 # please be aware that mtg needs to do some external requests. For
@@ -84,8 +102,8 @@ allow-fallback-on-unknown-dc = false
 # resolver of the operating system and uses DOH instead. This is a host
 # it has to access.
 #
-# By default we use Quad9.
+# By default we use Cloudflare.
-doh-ip = "9.9.9.9"
+doh-ip = "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

go.mod

@@ -1,57 +1,54 @@
 module github.com/9seconds/mtg/v2
 
-go 1.17
+go 1.25
 
 require (
 	github.com/OneOfOne/xxhash v1.2.8
-	github.com/alecthomas/kong v0.5.0
+	github.com/alecthomas/kong v1.14.0
-	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137
+	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/mccutchen/go-httpbin v1.1.1
-	github.com/panjf2000/ants/v2 v2.4.8
+	github.com/panjf2000/ants/v2 v2.11.5
-	github.com/pelletier/go-toml v1.9.4
+	github.com/prometheus/client_golang v1.23.2
-	github.com/prometheus/client_golang v1.12.1
+	github.com/prometheus/common v0.67.5 // indirect
-	github.com/prometheus/common v0.32.1 // indirect
+	github.com/prometheus/procfs v0.19.2 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/rs/zerolog v1.34.0
-	github.com/rs/zerolog v1.26.1
+	github.com/smira/go-statsd v1.3.4
-	github.com/smira/go-statsd v1.3.2
+	github.com/stretchr/objx v0.5.2 // indirect
-	github.com/stretchr/objx v0.3.0 // indirect
+	github.com/stretchr/testify v1.11.1
-	github.com/stretchr/testify v1.7.0
+	github.com/tylertreat/BoomFilters v0.0.0-20251117164519-53813c36cc1b
-	github.com/tylertreat/BoomFilters v0.0.0-20210315201527-1a82519a3e43
+	golang.org/x/crypto v0.48.0
-	golang.org/x/crypto v0.0.0-20220307211146-efcb8507fb70
+	golang.org/x/net v0.49.0 // indirect
-	golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2 // indirect
+	golang.org/x/sys v0.41.0
-	golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5
+	google.golang.org/protobuf v1.36.11 // indirect
-	google.golang.org/protobuf v1.27.1 // indirect
 )
 
 require (
-	github.com/txthinking/socks5 v0.0.0-20220212043548-414499347d4a
+	github.com/pelletier/go-toml/v2 v2.2.4
+	github.com/pires/go-proxyproto v0.11.0
+	github.com/txthinking/socks5 v0.0.0-20251011041537-5c31f201a10e
 	github.com/yl2chen/cidranger v1.0.2
 )
 
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cenkalti/backoff/v4 v4.1.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/gotd/ige v0.1.5 // indirect
+	github.com/klauspost/compress v1.18.3 // indirect
-	github.com/gotd/xor v0.1.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/txthinking/runnergroup v0.0.0-20220212043759-8da8edb7dae8 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
-	github.com/txthinking/x v0.0.0-20210326105829-476fab902fbe // indirect
+	github.com/txthinking/runnergroup v0.0.0-20250224021307-5864ffeb65ae // indirect
-	go.uber.org/atomic v1.7.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.3 // indirect
-	go.uber.org/multierr v1.6.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
-	go.uber.org/zap v1.16.0 // indirect
+	golang.org/x/tools v0.41.0 // indirect
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )

go.sum

@@ -1,588 +1,158 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
-cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
-cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
-cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
-cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
-cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
-cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
-cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
-cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
-cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
-cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
-cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
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-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-honnef.co/go/tools v0.0.1-2020.1.4 h1:UoveltGrhghAA7ePc+e+QYDHXrBps2PqFZiHkGR/xK8=
-honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

internal/cli/access.go

@@ -61,11 +61,8 @@ func (a *Access) Run(cli *CLI, version string) error {
 	}
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2) // nolint: gomnd
-
-	go func() {
-		defer wg.Done()
 
+	wg.Go(func() {
 		ip := a.PublicIPv4
 		if ip == nil {
 			ip = a.getIP(ntw, "tcp4")
@@ -76,11 +73,8 @@ func (a *Access) Run(cli *CLI, version string) error {
 		}
 
 		resp.IPv4 = a.makeURLs(conf, ip)
-	}()
+	})
-
+	wg.Go(func() {
-	go func() {
-		defer wg.Done()
-
 		ip := a.PublicIPv6
 		if ip == nil {
 			ip = a.getIP(ntw, "tcp6")
@@ -91,7 +85,7 @@ func (a *Access) Run(cli *CLI, version string) error {
 		}
 
 		resp.IPv6 = a.makeURLs(conf, ip)
-	}()
+	})
 
 	wg.Wait()
 
@@ -129,7 +123,7 @@ func (a *Access) getIP(ntw mtglib.Network, protocol string) net.IP {
 
 	defer func() {
 		io.Copy(io.Discard, resp.Body) //nolint: errcheck
-		resp.Body.Close()
+		resp.Body.Close()              //nolint: errcheck
 	}()
 
 	data, err := io.ReadAll(resp.Body)

internal/cli/run_proxy.go

@@ -10,13 +10,17 @@ import (
 	"github.com/9seconds/mtg/v2/antireplay"
 	"github.com/9seconds/mtg/v2/events"
 	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/9seconds/mtg/v2/internal/proxyprotocol"
 	"github.com/9seconds/mtg/v2/internal/utils"
 	"github.com/9seconds/mtg/v2/ipblocklist"
+	"github.com/9seconds/mtg/v2/ipblocklist/files"
 	"github.com/9seconds/mtg/v2/logger"
 	"github.com/9seconds/mtg/v2/mtglib"
 	"github.com/9seconds/mtg/v2/network"
 	"github.com/9seconds/mtg/v2/stats"
+	"github.com/pires/go-proxyproto"
 	"github.com/rs/zerolog"
+	"github.com/yl2chen/cidranger"
 )
 
 func makeLogger(conf *config.Config) mtglib.Logger {
@@ -89,7 +93,8 @@ func makeAntiReplayCache(conf *config.Config) mtglib.AntiReplayCache {
 func makeIPBlocklist(conf config.ListConfig,
 	logger mtglib.Logger,
 	ntw mtglib.Network,
-	updateCallback ipblocklist.FireholUpdateCallback) (mtglib.IPBlocklist, error) {
+	updateCallback ipblocklist.FireholUpdateCallback,
+) (mtglib.IPBlocklist, error) {
 	if !conf.Enabled.Get(false) {
 		return ipblocklist.NewNoop(), nil
 	}
@@ -105,7 +110,7 @@ func makeIPBlocklist(conf config.ListConfig,
 		}
 	}
 
-	firehol, err := ipblocklist.NewFirehol(logger.Named("ipblockist"),
+	blocklist, err := ipblocklist.NewFirehol(logger.Named("ipblockist"),
 		ntw,
 		conf.DownloadConcurrency.Get(1),
 		remoteURLs,
@@ -115,13 +120,53 @@ func makeIPBlocklist(conf config.ListConfig,
 		return nil, fmt.Errorf("incorrect parameters for firehol: %w", err)
 	}
 
-	go firehol.Run(conf.UpdateEach.Get(ipblocklist.DefaultFireholUpdateEach))
+	go blocklist.Run(conf.UpdateEach.Get(ipblocklist.DefaultFireholUpdateEach))
 
-	return firehol, nil
+	return blocklist, nil
+}
+
+func makeIPAllowlist(conf config.ListConfig,
+	logger mtglib.Logger,
+	ntw mtglib.Network,
+	updateCallback ipblocklist.FireholUpdateCallback,
+) (mtglib.IPBlocklist, error) {
+	var (
+		allowlist mtglib.IPBlocklist
+		err       error
+	)
+
+	if !conf.Enabled.Get(false) {
+		allowlist, err = ipblocklist.NewFireholFromFiles(
+			logger.Named("ipblocklist"),
+			1,
+			[]files.File{
+				files.NewMem([]*net.IPNet{
+					cidranger.AllIPv4,
+					cidranger.AllIPv6,
+				}),
+			},
+			updateCallback,
+		)
+
+		go allowlist.Run(conf.UpdateEach.Get(ipblocklist.DefaultFireholUpdateEach))
+	} else {
+		allowlist, err = makeIPBlocklist(
+			conf,
+			logger,
+			ntw,
+			updateCallback,
+		)
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("cannot build allowlist: %w", err)
+	}
+
+	return allowlist, nil
 }
 
 func makeEventStream(conf *config.Config, logger mtglib.Logger) (mtglib.EventStream, error) {
-	factories := make([]events.ObserverFactory, 0, 2) // nolint: gomnd
+	factories := make([]events.ObserverFactory, 0, 2)
 
 	if conf.Stats.StatsD.Enabled.Get(false) {
 		statsdFactory, err := stats.NewStatsd(
@@ -185,21 +230,24 @@ func runProxy(conf *config.Config, version string) error { // nolint: funlen
 		return fmt.Errorf("cannot build ip blocklist: %w", err)
 	}
 
-	var whitelist mtglib.IPBlocklist
+	allowlist, err := makeIPAllowlist(
-
-	if conf.Defense.Allowlist.Enabled.Get(false) {
-		whlist, err := makeIPBlocklist(
 		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)
 	}
 
-		whitelist = whlist
+	dcOverrides := map[int][]string{}
+	for _, override := range conf.DCOverrides {
+		dcid := override.DC.Get()
+		for _, addr := range override.IPs {
+			dcOverrides[dcid] = append(dcOverrides[dcid], addr.Get(""))
+		}
 	}
 
 	opts := mtglib.ProxyOpts{
@@ -207,7 +255,7 @@ func runProxy(conf *config.Config, version string) error { // nolint: funlen
 		Network:         ntw,
 		AntiReplayCache: makeAntiReplayCache(conf),
 		IPBlocklist:     blocklist,
-		IPWhitelist:     whitelist,
+		IPAllowlist:     allowlist,
 		EventStream:     eventStream,
 
 		Secret:             conf.Secret,
@@ -216,6 +264,7 @@ func runProxy(conf *config.Config, version string) error { // nolint: funlen
 
 		AllowFallbackOnUnknownDC: conf.AllowFallbackOnUnknownDC.Get(false),
 		TolerateTimeSkewness:     conf.TolerateTimeSkewness.Value,
+		DCOverrides:              dcOverrides,
 	}
 
 	proxy, err := mtglib.NewProxy(opts)
@@ -228,12 +277,20 @@ func runProxy(conf *config.Config, version string) error { // nolint: funlen
 		return fmt.Errorf("cannot start proxy: %w", err)
 	}
 
+	if conf.ProxyProtocolListener.Get(false) {
+		listener = &proxyprotocol.ListenerAdapter{
+			Listener: proxyproto.Listener{
+				Listener: listener,
+			},
+		}
+	}
+
 	ctx := utils.RootContext()
 
 	go proxy.Serve(listener) //nolint: errcheck
 
 	<-ctx.Done()
-	listener.Close()
+	listener.Close() //nolint: errcheck
 	proxy.Shutdown()
 
 	return nil

internal/cli/simple_run.go

@@ -18,12 +18,13 @@ type SimpleRun struct {
 	TCPBuffer           string        `kong:"name='tcp-buffer',short='b',default='4KB',help='Deprecated and ignored'"`                                                 //nolint: lll
 	PreferIP            string        `kong:"name='prefer-ip',short='i',default='prefer-ipv6',help='IP preference. By default we prefer IPv6 with fallback to IPv4.'"` //nolint: lll
 	DomainFrontingPort  uint64        `kong:"name='domain-fronting-port',short='p',default='443',help='A port to access for domain fronting.'"`                        //nolint: lll
-	DOHIP               net.IP        `kong:"name='doh-ip',short='n',default='9.9.9.9',help='IP address of DNS-over-HTTP to use.'"`                                    // nolint: lll
+	DOHIP               net.IP        `kong:"name='doh-ip',short='n',default='1.1.1.1',help='IP address of DNS-over-HTTP to use.'"`                                    //nolint: lll
 	Timeout             time.Duration `kong:"name='timeout',short='t',default='10s',help='Network timeout to use'"`                                                    //nolint: lll
+	Socks5Proxies       []string      `kong:"name='socks5-proxy',short='s',help='Socks5 proxies to use for network access.'"`                                          //nolint: lll
 	AntiReplayCacheSize string        `kong:"name='antireplay-cache-size',short='a',default='1MB',help='A size of anti-replay cache to use.'"`                         //nolint: lll
 }
 
-func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
+func (s *SimpleRun) Run(cli *CLI, version string) error { //nolint: cyclop,funlen
 	conf := &config.Config{}
 
 	if err := conf.BindTo.Set(s.BindTo); err != nil {
@@ -34,7 +35,7 @@ func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
 		return fmt.Errorf("incorrect secret: %w", err)
 	}
 
-	if err := conf.Concurrency.Set(strconv.FormatUint(s.Concurrency, 10)); err != nil { // nolint: gomnd
+	if err := conf.Concurrency.Set(strconv.FormatUint(s.Concurrency, 10)); err != nil {
 		return fmt.Errorf("incorrect concurrency: %w", err)
 	}
 
@@ -42,7 +43,7 @@ func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
 		return fmt.Errorf("incorrect prefer-ip: %w", err)
 	}
 
-	if err := conf.DomainFrontingPort.Set(strconv.FormatUint(s.DomainFrontingPort, 10)); err != nil { // nolint: gomnd
+	if err := conf.DomainFrontingPort.Set(strconv.FormatUint(s.DomainFrontingPort, 10)); err != nil {
 		return fmt.Errorf("incorrect domain-fronting-port: %w", err)
 	}
 
@@ -66,6 +67,16 @@ func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
 		return fmt.Errorf("incorrect antireplay-cache-size: %w", err)
 	}
 
+	for _, v := range s.Socks5Proxies {
+		proxyURL := config.TypeProxyURL{}
+
+		if err := proxyURL.Set(v); err != nil {
+			return fmt.Errorf("incorrect socks5 proxy URL: %w", err)
+		}
+
+		conf.Network.Proxies = append(conf.Network.Proxies, proxyURL)
+	}
+
 	conf.Debug.Value = s.Debug
 	conf.AllowFallbackOnUnknownDC.Value = true
 	conf.Defense.AntiReplay.Enabled.Value = true

internal/config/config.go

@@ -25,6 +25,7 @@ type Config struct {
 	AllowFallbackOnUnknownDC TypeBool        `json:"allowFallbackOnUnknownDc"`
 	Secret                   mtglib.Secret   `json:"secret"`
 	BindTo                   TypeHostPort    `json:"bindTo"`
+	ProxyProtocolListener    TypeBool        `json:"proxyProtocolListener"`
 	PreferIP                 TypePreferIP    `json:"preferIp"`
 	DomainFrontingPort       TypePort        `json:"domainFrontingPort"`
 	TolerateTimeSkewness     TypeDuration    `json:"tolerateTimeSkewness"`
@@ -64,6 +65,10 @@ type Config struct {
 			MetricPrefix TypeMetricPrefix `json:"metricPrefix"`
 		} `json:"prometheus"`
 	} `json:"stats"`
+	DCOverrides []struct {
+		DC  TypeDC         `json:"dc"`
+		IPs []TypeHostPort `json:"ips"`
+	} `json:"dcOverrides"`
 }
 
 func (c *Config) Validate() error {

internal/config/parse.go

@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 
-	"github.com/pelletier/go-toml"
+	"github.com/pelletier/go-toml/v2"
 )
 
 type tomlConfig struct {
@@ -13,6 +13,7 @@ type tomlConfig struct {
 	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"`
 	DomainFrontingPort       uint   `toml:"domain-fronting-port" json:"domainFrontingPort,omitempty"`
 	TolerateTimeSkewness     string `toml:"tolerate-time-skewness" json:"tolerateTimeSkewness,omitempty"`
@@ -59,6 +60,10 @@ type tomlConfig struct {
 			MetricPrefix string `toml:"metric-prefix" json:"metricPrefix,omitempty"`
 		} `toml:"prometheus" json:"prometheus,omitempty"`
 	} `toml:"stats" json:"stats,omitempty"`
+	DCOverrides []struct {
+		DC  uint     `toml:"dc" json:"dc"`
+		IPs []string `toml:"ips" json:"ips"`
+	} `toml:"dc-overrides" json:"dcOverrides,omitempty"`
 }
 
 func Parse(rawData []byte) (*Config, error) {

internal/config/type_bool_test.go

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

internal/config/type_concurrency.go

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

internal/config/type_dc.go

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

internal/config/type_dc_test.go

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

internal/config/type_error_rate.go

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

internal/config/type_hostport.go

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

internal/config/type_port.go

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

internal/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

@@ -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

@@ -25,6 +25,7 @@ func (m *MtglibNetworkMock) DialContext(ctx context.Context, network, address st
 }
 
 func (m *MtglibNetworkMock) MakeHTTPClient(dialFunc func(ctx context.Context,
-	network, address string) (essentials.Conn, error)) *http.Client {
+	network, address string) (essentials.Conn, error),
+) *http.Client {
 	return m.Called(dialFunc).Get(0).(*http.Client) //nolint: forcetypeassert
 }

internal/utils/net_listener.go

@@ -18,7 +18,7 @@ func (l Listener) Accept() (net.Conn, error) {
 	}
 
 	if err := network.SetClientSocketOptions(conn, 0); err != nil {
-		conn.Close()
+		conn.Close() //nolint: errcheck
 
 		return nil, fmt.Errorf("cannot set TCP options: %w", err)
 	}

internal/utils/rlimit.go

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

internal/utils/rlimit_windows.go

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

ipblocklist/files/doc.go

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

ipblocklist/files/http.go

@@ -23,7 +23,7 @@ func (h httpFile) Open(ctx context.Context) (io.ReadCloser, error) {
 	if err != nil {
 		if response != nil {
 			io.Copy(io.Discard, response.Body) //nolint: errcheck
-			response.Body.Close()
+			response.Body.Close()              //nolint: errcheck
 		}
 
 		return nil, fmt.Errorf("cannot get url %s: %w", h.url, err)
@@ -40,6 +40,8 @@ func (h httpFile) String() string {
 	return h.url
 }
 
+// NewHTTP returns a file abstraction for HTTP/HTTPS endpoint. You also need to
+// provide a valid instance of [http.Client] to access it.
 func NewHTTP(client *http.Client, endpoint string) (File, error) {
 	if client == nil {
 		return nil, ErrBadHTTPClient

ipblocklist/files/http_test.go

@@ -77,7 +77,7 @@ func (suite *HTTPTestSuite) TestOk() {
 	readCloser, err := file.Open(suite.ctx)
 	suite.NoError(err)
 
-	defer readCloser.Close()
+	defer readCloser.Close() //nolint: errcheck
 
 	data, err := io.ReadAll(readCloser)
 	suite.NoError(err)

ipblocklist/files/init.go

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

ipblocklist/files/local.go

@@ -19,6 +19,7 @@ func (l localFile) String() string {
 	return l.path
 }
 
+// NewLocal returns an openable File for a path on a local file system.
 func NewLocal(path string) (File, error) {
 	if stat, err := os.Stat(path); os.IsNotExist(err) || stat.IsDir() || stat.Mode().Perm()&0o400 == 0 {
 		return nil, fmt.Errorf("%s is not a readable file", path)

ipblocklist/files/mem.go

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

ipblocklist/files/mem_test.go

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

ipblocklist/firehol.go

@@ -19,20 +19,20 @@ import (
 var (
 	fireholRegexpComment = regexp.MustCompile(`\s*#.*?$`)
 
-	fireholIPv4DefaultCIDR = net.CIDRMask(32, 32)   // nolint: gomnd
+	fireholIPv4DefaultCIDR = net.CIDRMask(32, 32)
-	fireholIPv6DefaultCIDR = net.CIDRMask(128, 128) // nolint: gomnd
+	fireholIPv6DefaultCIDR = net.CIDRMask(128, 128)
 )
 
 // FireholUpdateCallback defines a signature of the callback that has to be
 // execute when ip list is updated.
 type FireholUpdateCallback func(context.Context, int)
 
-// Firehol is IPBlocklist which uses lists from FireHOL:
+// Firehol is [mtglib.IPBlocklist] which uses lists from FireHOL:
 // https://iplists.firehol.org/
 //
-// It can use both local files and remote URLs. This is not necessary
+// It can use both local files and remote URLs. This is not necessary that
-// that blocklists should be taken from this website, we expect only
+// blocklists should be taken from this website, we expect only compatible
-// compatible formats here.
+// formats here.
 //
 // Example of the format:
 //
@@ -78,8 +78,7 @@ func (f *Firehol) Contains(ip net.IP) bool {
 
 // Run starts a background update process.
 //
-// This is a blocking method so you probably want to run it in a
+// This is a blocking method so you probably want to run it in a goroutine.
-// goroutine.
 func (f *Firehol) Run(updateEach time.Duration) {
 	if updateEach == 0 {
 		updateEach = DefaultFireholUpdateEach
@@ -113,30 +112,27 @@ func (f *Firehol) update() {
 	defer cancel()
 
 	wg := &sync.WaitGroup{}
-	wg.Add(len(f.blocklists))
 
 	mutex := &sync.Mutex{}
 	ranger := cidranger.NewPCTrieRanger()
 
 	for _, v := range f.blocklists {
-		go func(file files.File) {
+		wg.Go(func() {
-			defer wg.Done()
+			logger := f.logger.BindStr("filename", v.String())
 
-			logger := f.logger.BindStr("filename", file.String())
+			fileContent, err := v.Open(ctx)
-
-			fileContent, err := file.Open(ctx)
 			if err != nil {
 				logger.WarningError("update has failed", err)
 
 				return
 			}
 
-			defer fileContent.Close()
+			defer fileContent.Close() //nolint: errcheck
 
 			if err := f.updateFromFile(mutex, ranger, bufio.NewScanner(fileContent)); err != nil {
 				logger.WarningError("update has failed", err)
 			}
-		}(v)
+		})
 	}
 
 	wg.Wait()
@@ -155,7 +151,8 @@ func (f *Firehol) update() {
 
 func (f *Firehol) updateFromFile(mutex sync.Locker,
 	ranger cidranger.Ranger,
-	scanner *bufio.Scanner) error {
+	scanner *bufio.Scanner,
+) error {
 	for scanner.Scan() {
 		text := scanner.Text()
 		text = fireholRegexpComment.ReplaceAllLiteralString(text, "")
@@ -210,13 +207,14 @@ func (f *Firehol) updateParseLine(text string) (*net.IPNet, error) {
 
 // NewFirehol creates a new instance of FireHOL IP blocklist.
 //
-// This method does not start an update process so please execute Run
+// This method does not start an update process so please execute Run when it
-// when it is necessary.
+// is necessary.
 func NewFirehol(logger mtglib.Logger, network mtglib.Network,
 	downloadConcurrency uint,
 	urls []string,
 	localFiles []string,
-	updateCallback FireholUpdateCallback) (*Firehol, error) {
+	updateCallback FireholUpdateCallback,
+) (*Firehol, error) {
 	blocklists := []files.File{}
 
 	for _, v := range localFiles {
@@ -242,10 +240,14 @@ func NewFirehol(logger mtglib.Logger, network mtglib.Network,
 	return NewFireholFromFiles(logger, downloadConcurrency, blocklists, updateCallback)
 }
 
+// NewFirehol creates a new instance of FireHOL IP blocklist.
+//
+// This method creates this instances from a given list of files.
 func NewFireholFromFiles(logger mtglib.Logger,
 	downloadConcurrency uint,
 	blocklists []files.File,
-	updateCallback FireholUpdateCallback) (*Firehol, error) {
+	updateCallback FireholUpdateCallback,
+) (*Firehol, error) {
 	if downloadConcurrency == 0 {
 		downloadConcurrency = DefaultFireholDownloadConcurrency
 	}

ipblocklist/firehol_test.go

@@ -35,7 +35,7 @@ func (suite *FireholTestSuite) SetupSuite() {
 			panic(err)
 		}
 
-		defer filefp.Close()
+		defer filefp.Close() //nolint: errcheck
 
 		io.Copy(w, filefp) //nolint: errcheck
 	})

ipblocklist/init.go

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

ipblocklist/noop.go

@@ -13,8 +13,7 @@ func (n noop) Contains(ip net.IP) bool      { return false }
 func (n noop) Run(updateEach time.Duration) {}
 func (n noop) Shutdown()                    {}
 
-// NewNoop returns a dummy ipblocklist which allows all incoming
+// NewNoop returns a dummy ipblocklist which allows all incoming connections.
-// connections.
 func NewNoop() mtglib.IPBlocklist {
 	return noop{}
 }

logger/init.go

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

logger/noop.go

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

logger/zerolog.go

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

main.go

@@ -9,26 +9,14 @@
 package main
 
 import (
-	"math/rand"
-	"time"
-
 	"github.com/9seconds/mtg/v2/internal/cli"
-	"github.com/9seconds/mtg/v2/internal/utils"
 	"github.com/alecthomas/kong"
 )
 
-var version = "dev" // has to be set by ldflags
-
 func main() {
-	rand.Seed(time.Now().UTC().UnixNano())
-
-	if err := utils.SetLimits(); err != nil {
-		panic(err)
-	}
-
 	cli := &cli.CLI{}
 	ctx := kong.Parse(cli, kong.Vars{
-		"version": version,
+		"version": getVersion(),
 	})
 
 	ctx.FatalIfErrorf(ctx.Run(cli, version))

mise.lock

@@ -0,0 +1,38 @@
+[[tools.go]]
+version = "1.26.0"
+backend = "core:go"
+"platforms.linux-arm64" = { checksum = "sha256:bd03b743eb6eb4193ea3c3fd3956546bf0e3ca5b7076c8226334afe6b75704cd", url = "https://dl.google.com/go/go1.26.0.linux-arm64.tar.gz"}
+"platforms.linux-x64" = { checksum = "sha256:aac1b08a0fb0c4e0a7c1555beb7b59180b05dfc5a3d62e40e9de90cd42f88235", url = "https://dl.google.com/go/go1.26.0.linux-amd64.tar.gz"}
+"platforms.macos-arm64" = { checksum = "sha256:b1640525dfe68f066d56f200bef7bf4dce955a1a893bd061de6754c211431023", url = "https://dl.google.com/go/go1.26.0.darwin-arm64.tar.gz"}
+"platforms.macos-x64" = { checksum = "sha256:1ca28b7703cbea05a65b2a1d92d6b308610ef92f8824578a0874f2e60c9d5a22", url = "https://dl.google.com/go/go1.26.0.darwin-amd64.tar.gz"}
+"platforms.windows-x64" = { checksum = "sha256:9bbe0fc64236b2b51f6255c05c4232532b8ecc0e6d2e00950bd3021d8a4d07d4", url = "https://dl.google.com/go/go1.26.0.windows-amd64.zip"}
+
+[[tools."go:golang.org/x/pkgsite/cmd/pkgsite"]]
+version = "latest"
+backend = "go:golang.org/x/pkgsite/cmd/pkgsite"
+
+[[tools."go:golang.org/x/tools/gopls"]]
+version = "0.21.1"
+backend = "go:golang.org/x/tools/gopls"
+
+[[tools."go:mvdan.cc/gofumpt"]]
+version = "0.9.2"
+backend = "go:mvdan.cc/gofumpt"
+
+[[tools.golangci-lint]]
+version = "2.10.1"
+backend = "aqua:golangci/golangci-lint"
+"platforms.linux-arm64" = { checksum = "sha256:6652b42ae02915eb2f9cb2a2e0cac99514c8eded8388d88ae3e06e1a52c00de8", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-linux-arm64.tar.gz"}
+"platforms.linux-x64" = { checksum = "sha256:dfa775874cf0561b404a02a8f4481fc69b28091da95aa697259820d429b09c99", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-linux-amd64.tar.gz"}
+"platforms.macos-arm64" = { checksum = "sha256:03bfadf67e52b441b7ec21305e501c717df93c959836d66c7f97312654acb297", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-darwin-arm64.tar.gz"}
+"platforms.macos-x64" = { checksum = "sha256:66fb0da81b8033b477f97eea420d4b46b230ca172b8bb87c6610109f3772b6b6", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-darwin-amd64.tar.gz"}
+"platforms.windows-x64" = { checksum = "sha256:c60c87695e79db8e320f0e5be885059859de52bb5ee5f11be5577828570bc2a3", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-windows-amd64.zip"}
+
+[[tools.goreleaser]]
+version = "2.13.3"
+backend = "aqua:goreleaser/goreleaser"
+"platforms.linux-arm64" = { checksum = "sha256:156656d0f874542d618568bd50afd3d33ced2e8aab2c60cc7c21e1b9fa52031e", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Linux_arm64.tar.gz"}
+"platforms.linux-x64" = { checksum = "sha256:4b66f2f78f78561330350651ade557b70328664718490f37834749073af21d20", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Linux_x86_64.tar.gz"}
+"platforms.macos-arm64" = { checksum = "sha256:5516c37779efb3935d5b213cda3b0b9025ae94ddbcb51df6919acbcdef4194b0", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Darwin_all.tar.gz"}
+"platforms.macos-x64" = { checksum = "sha256:5516c37779efb3935d5b213cda3b0b9025ae94ddbcb51df6919acbcdef4194b0", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Darwin_all.tar.gz"}
+"platforms.windows-x64" = { checksum = "sha256:c5586c4ed749ca358ad61ed73ee4b8039cfa68daae8c23e69fb086d549dfb31d", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Windows_x86_64.zip"}

mtglib/events.go

@@ -29,13 +29,13 @@ type EventStart struct {
 	RemoteIP net.IP
 }
 
-// EventConnectedToDC is emitted when mtg proxy has connected to a
+// EventConnectedToDC is emitted when mtg proxy has connected to a Telegram
-// Telegram server.
+// server.
 type EventConnectedToDC struct {
 	eventBase
 
-	// RemoteIP is an IP address of the Telegram server proxy has been
+	// RemoteIP is an IP address of the Telegram server proxy has been connected
-	// connected to.
+	// to.
 	RemoteIP net.IP
 
 	// DC is an index of the datacenter proxy has been connected to.
@@ -49,15 +49,15 @@ type EventTraffic struct {
 	// Traffic is a count of bytes which were transmitted.
 	Traffic uint
 
-	// IsRead defines if we _read_ or _write_ to connection. A rule of
+	// IsRead defines if we _read_ or _write_ to connection. A rule of thumb is
-	// thumb is simple: EventTraffic is bound to a remote connection. Not
+	// simple: EventTraffic is bound to a remote connection. Not to a client one,
-	// to a client one, but either to Telegram or front domain one.
+	// but either to Telegram or front domain one.
 	//
-	// In the case of Telegram, isRead means that we've fetched some bytes
+	// In the case of Telegram, isRead means that we've fetched some bytes from
-	// from Telegram to send it to a client.
+	// Telegram to send it to a client.
 	//
-	// In the case of the front domain, it means that we've fetched some
+	// In the case of the front domain, it means that we've fetched some bytes
-	// bytes from this domain to send it to a client.
+	// from this domain to send it to a client.
 	IsRead bool
 }
 
@@ -66,24 +66,25 @@ type EventFinish struct {
 	eventBase
 }
 
-// EventDomainFronting is emitted when we connect to a front domain
+// EventDomainFronting is emitted when we connect to a front domain instead of
-// instead of Telegram server.
+// Telegram server.
 type EventDomainFronting struct {
 	eventBase
 }
 
-// EventConcurrencyLimited is emitted when connection was declined
+// EventConcurrencyLimited is emitted when connection was declined because of
-// because of the concurrency limit of the worker pool.
+// the concurrency limit of the worker pool.
 type EventConcurrencyLimited struct {
 	eventBase
 }
 
-// EventIPBlocklisted is emitted when connection was declined because
+// EventIPBlocklisted is emitted when connection was declined because IP
-// IP address was found in IP blocklist.
+// address was found in IP blocklist.
 type EventIPBlocklisted struct {
 	eventBase
 
 	RemoteIP    net.IP
+	IsBlockList bool
 }
 
 // EventReplayAttack is emitted when mtg detects a replay attack on a
@@ -173,6 +174,19 @@ func NewEventIPBlocklisted(remoteIP net.IP) EventIPBlocklisted {
 			timestamp: time.Now(),
 		},
 		RemoteIP:    remoteIP,
+		IsBlockList: true,
+	}
+}
+
+// NewEventIPAllowlisted creates a NewEventIPBlocklisted event with a mark that
+// it is supposed to be for allow list.
+func NewEventIPAllowlisted(remoteIP net.IP) EventIPBlocklisted {
+	return EventIPBlocklisted{
+		eventBase: eventBase{
+			timestamp: time.Now(),
+		},
+		RemoteIP:    remoteIP,
+		IsBlockList: false,
 	}
 }
 

mtglib/events_test.go

@@ -60,6 +60,15 @@ func (suite *EventsTestSuite) TestEventIPBlocklisted() {
 
 	suite.Empty(evt.StreamID())
 	suite.WithinDuration(time.Now(), evt.Timestamp(), 10*time.Millisecond)
+	suite.True(evt.IsBlockList)
+}
+
+func (suite *EventsTestSuite) TestEventIPAllowlisted() {
+	evt := mtglib.NewEventIPAllowlisted(net.ParseIP("10.0.0.10"))
+
+	suite.Empty(evt.StreamID())
+	suite.WithinDuration(time.Now(), evt.Timestamp(), 10*time.Millisecond)
+	suite.False(evt.IsBlockList)
 }
 
 func (suite *EventsTestSuite) TestEventReplayAttack() {

mtglib/init.go

@@ -1,20 +1,19 @@
 // mtglib defines a package with MTPROTO proxy.
 //
-// Since mtg itself is build as an example of how to work with mtglib,
+// Since mtg itself is build as an example of how to work with mtglib, it worth
-// it worth to telling a couple of words about a project organization.
+// to telling a couple of words about a project organization.
 //
-// A core object of the project is mtglib.Proxy. This is a proxy you
+// A core object of the project is [mtglib.Proxy]. This is a proxy you expect:
-// expect: that one which you configure, set to serve on a listener
+// that one which you configure, set to serve on a listener and/or shutdown on
-// and/or shutdown on application termination.
+// application termination.
 //
-// But it also has a core logic unrelated to Telegram per se: anti
+// But it also has a core logic unrelated to Telegram per se: anti replay
-// replay cache, network connectivity (who knows, maybe you want to have
+// cache, network connectivity (who knows, maybe you want to have a native
-// a native VMESS integration) and so on.
+// VMESS integration) and so on.
 //
-// You can supply such parts to a proxy with interfaces. The rest of
+// You can supply such parts to a proxy with interfaces. The rest of the
-// the packages in mtg define some default implementations of these
+// packages in mtg define some default implementations of these interfaces. But
-// interfaces. But if you want to integrate it with, let say, influxdb,
+// if you want to integrate it with, let say, influxdb, you can do it easily.
-// you can do it easily.
 package mtglib
 
 import (
@@ -28,38 +27,42 @@ import (
 )
 
 var (
-	// ErrSecretEmpty is returned if you are trying to create a proxy
+	// ErrSecretEmpty is returned if you are trying to create a proxy but do not
-	// but do not provide a secret.
+	// provide a secret.
 	ErrSecretEmpty = errors.New("secret is empty")
 
-	// ErrSecretInvalid is returned if you are trying to create a proxy
+	// ErrSecretInvalid is returned if you are trying to create a proxy but secret
-	// but secret value is invalid (no host or payload are zeroes).
+	// value is invalid (no host or payload are zeroes).
 	ErrSecretInvalid = errors.New("secret is invalid")
 
-	// ErrNetworkIsNotDefined is returned if you are trying to create a
+	// ErrNetworkIsNotDefined is returned if you are trying to create a proxy but
-	// proxy but network value is undefined.
+	// network value is undefined.
 	ErrNetworkIsNotDefined = errors.New("network is not defined")
 
-	// ErrAntiReplayCacheIsNotDefined is returned if you are trying to
+	// ErrAntiReplayCacheIsNotDefined is returned if you are trying to create a
-	// create a proxy but anti replay cache value is undefined.
+	// proxy but anti replay cache value is undefined.
 	ErrAntiReplayCacheIsNotDefined = errors.New("anti-replay cache is not defined")
 
-	// ErrIPBlocklistIsNotDefined is returned if you are trying to
+	// ErrIPBlocklistIsNotDefined is returned if you are trying to create a proxy
-	// create a proxy but ip blocklist instance is not defined.
+	// but ip blocklist instance is not defined.
 	ErrIPBlocklistIsNotDefined = errors.New("ip blocklist is not defined")
 
-	// ErrEventStreamIsNotDefined is returned if you are trying to create a
+	// ErrIPAllowlistIsNotDefined is returned if you are trying to create a proxy
-	// proxy but event stream instance is not defined.
+	// but ip allowlist instance is not defined.
+	ErrIPAllowlistIsNotDefined = errors.New("ip allowlist is not defined")
+
+	// ErrEventStreamIsNotDefined is returned if you are trying to create a proxy
+	// but event stream instance is not defined.
 	ErrEventStreamIsNotDefined = errors.New("event stream is not defined")
 
-	// ErrLoggerIsNotDefined is returned if you are trying to
+	// ErrLoggerIsNotDefined is returned if you are trying to create a proxy but
-	// create a proxy but logger is not defined.
+	// logger is not defined.
 	ErrLoggerIsNotDefined = errors.New("logger is not defined")
 )
 
 const (
-	// DefaultConcurrency is a default max count of simultaneously
+	// DefaultConcurrency is a default max count of simultaneously connected
-	// connected clients.
+	// clients.
 	DefaultConcurrency = 4096
 
 	// DefaultBufferSize is a default size of a copy buffer.
@@ -67,31 +70,29 @@ const (
 	// Deprecated: this setting no longer makes any effect.
 	DefaultBufferSize = 16 * 1024 // 16 kib
 
-	// DefaultDomainFrontingPort is a default port (HTTPS) to connect to in
+	// DefaultDomainFrontingPort is a default port (HTTPS) to connect to in case
-	// case of probe-resistance activity.
+	// of probe-resistance activity.
 	DefaultDomainFrontingPort = 443
 
-	// DefaultIdleTimeout is a default timeout for closing a connection
+	// DefaultIdleTimeout is a default timeout for closing a connection in case of
-	// in case of idling.
+	// idling.
 	//
-	// Deprecated: no longer in use because of changed TCP relay
+	// Deprecated: no longer in use because of changed TCP relay algorithm.
-	// algorithm.
 	DefaultIdleTimeout = time.Minute
 
-	// DefaultTolerateTimeSkewness is a default timeout for time
+	// DefaultTolerateTimeSkewness is a default timeout for time skewness on a
-	// skewness on a faketls timeout verification.
+	// faketls timeout verification.
 	DefaultTolerateTimeSkewness = 3 * time.Second
 
-	// DefaultPreferIP is a default value for Telegram IP connectivity
+	// DefaultPreferIP is a default value for Telegram IP connectivity preference.
-	// preference.
 	DefaultPreferIP = "prefer-ipv6"
 
-	// SecretKeyLength defines a length of the secret bytes used
+	// SecretKeyLength defines a length of the secret bytes used by Telegram and a
-	// by Telegram and a proxy.
+	// proxy.
 	SecretKeyLength = 16
 
-	// ConnectionIDBytesLength defines a count of random bytes used to generate
+	// ConnectionIDBytesLength defines a count of random bytes used to generate a
-	// a stream/connection ids.
+	// stream/connection ids.
 	ConnectionIDBytesLength = 16
 
 	// TCPRelayReadTimeout defines a max time period between two consecuitive
@@ -100,81 +101,76 @@ const (
 	TCPRelayReadTimeout = 20 * time.Second
 )
 
-// Network defines a knowledge how to work with a network. It may sound
+// Network defines a knowledge how to work with a network. It may sound fun but
-// fun but it encapsulates all the knowledge how to properly establish
+// it encapsulates all the knowledge how to properly establish connections to
-// connections to remote hosts and configure HTTP clients.
+// remote hosts and configure HTTP clients.
 //
-// For example, if you want to use SOCKS5 proxy, you probably want to
+// For example, if you want to use SOCKS5 proxy, you probably want to have all
-// have all traffic routed to this proxy: telegram connections, http
+// traffic routed to this proxy: telegram connections, http requests and so on.
-// requests and so on. This knowledge is encapsulated into instances of
+// This knowledge is encapsulated into instances of such interface.
-// such interface.
 //
 // mtglib uses Network for:
-//
 //  1. Dialing to Telegram
-//
 //  2. Dialing to front domain
-//
 //  3. Doing HTTP requests (for example, for FireHOL ipblocklist).
 type Network interface {
 	// Dial establishes context-free TCP connections.
 	Dial(network, address string) (essentials.Conn, error)
 
-	// DialContext dials using a context. This is a preferrable
+	// DialContext dials using a context. This is a preferrable way of
-	// way of establishing TCP connections.
+	// establishing TCP connections.
 	DialContext(ctx context.Context, network, address string) (essentials.Conn, error)
 
-	// MakeHTTPClient build an HTTP client with given dial function. If
+	// MakeHTTPClient build an HTTP client with given dial function. If nothing is
-	// nothing is provided, then DialContext of this interface is going
+	// provided, then DialContext of this interface is going to be used.
-	// to be used.
 	MakeHTTPClient(func(ctx context.Context, network, address string) (essentials.Conn, error)) *http.Client
 }
 
-// AntiReplayCache is an interface that is used to detect replay attacks
+// AntiReplayCache is an interface that is used to detect replay attacks based
-// based on some traffic fingerprints.
+// on some traffic fingerprints.
 //
-// Replay attacks are probe attacks whose main goal is to identify if
+// Replay attacks are probe attacks whose main goal is to identify if server
-// server software can be classified in some way. For example, if you
+// software can be classified in some way. For example, if you send some HTTP
-// send some HTTP request to a web server, then you can expect that this
+// request to a web server, then you can expect that this server will respond
-// server will respond with HTTP response back.
+// with HTTP response back.
 //
-// There is a problem though. Let's imagine, that connection is
+// There is a problem though. Let's imagine, that connection is encrypted.
-// encrypted. Let's imagine, that it is encrypted with some static key
+// Let's imagine, that it is encrypted with some static key like [ShadowSocks].
-// like ShadowSocks (https://shadowsocks.org/assets/whitepaper.pdf).
+// In that case, in theory, if you repeat the same bytes, you can get the same
-// In that case, in theory, if you repeat the same bytes, you can get
+// responses. Let's imagine, that you've cracked the key. then if you send the
-// the same responses. Let's imagine, that you've cracked the key. then
+// same bytes, you can decrypt a response and see its structure. Based on its
-// if you send the same bytes, you can decrypt a response and see its
+// structure you can identify if this server is SOCKS5, MTPROTO proxy etc.
-// structure. Based on its structure you can identify if this server is
-// SOCKS5, MTPROTO proxy etc.
 //
-// This is just one example, maybe not the best or not the most
+// This is just one example, maybe not the best or not the most relevant. In
-// relevant. In real life, different organizations use such replay
+// real life, different organizations use such replay attacks to perform some
-// attacks to perform some reverse engineering of the proxy, do some
+// reverse engineering of the proxy, do some statical analysis to identify
-// statical analysis to identify server software.
+// server software.
 //
-// There are many ways how to protect your proxy against them. One
+// There are many ways how to protect your proxy against them. One is domain
-// is domain fronting which is a core part of mtg. Another one is to
+// fronting which is a core part of mtg. Another one is to collect some
-// collect some 'handshake fingerprints' and forbid duplication.
+// 'handshake fingerprints' and forbid duplication.
 //
-// So, it one is sending the same byte flow right after you (or a couple
+// So, it one is sending the same byte flow right after you (or a couple of
-// of hours after), mtg should detect that and reject this connection
+// hours after), mtg should detect that and reject this connection (or redirect
-// (or redirect to fronting domain).
+// to fronting domain).
+//
+// [ShadowSocks]: https://shadowsocks.org/assets/whitepaper.pdf
 type AntiReplayCache interface {
-	// Seen before checks if this set of bytes was observed before or
+	// Seen before checks if this set of bytes was observed before or not. If it
-	// not. If it is required to store this information somewhere else,
+	// is required to store this information somewhere else, then it has to do
-	// then it has to do that.
+	// that.
 	SeenBefore(data []byte) bool
 }
 
 // IPBlocklist filters requests based on IP address.
 //
-// If this filter has an IP address, then mtg closes a request without
+// If this filter has an IP address, then mtg closes a request without reading
-// reading anything from a socket. It also does not give such request to
+// anything from a socket. It also does not give such request to a worker pool,
-// a worker pool, so in worst cases you can expect that you invoke this
+// so in worst cases you can expect that you invoke this object more frequent
-// object more frequent than defined proxy concurrency.
+// than defined proxy concurrency.
 type IPBlocklist interface {
-	// Contains checks if given IP address belongs to this blocklist If.
+	// Contains checks if given IP address belongs to this blocklist If. it is, a
-	// it is, a connection is terminated                               .
+	// connection is terminated .
 	Contains(net.IP) bool
 
 	// Run starts a background update procedure for a blocklist
@@ -184,40 +180,35 @@ type IPBlocklist interface {
 	Shutdown()
 }
 
-// Event is a data structure which is populated during mtg request
+// Event is a data structure which is populated during mtg request processing
-// processing lifecycle. Each request popluates many events:
+// lifecycle. Each request popluates many events:
-//
 //  1. Client connected
-//
 //  2. Request is finished
-//
 //  3. Connection to Telegram server is established
 //
-// and so on. All these events are data structures but all of them
+// and so on. All these events are data structures but all of them must conform
-// must conform the same interface.
+// the same interface.
 type Event interface {
-	// StreamID returns an identifier of the stream, connection,
+	// StreamID returns an identifier of the stream, connection, request, you name
-	// request, you name it. All events within the same stream returns
+	// it. All events within the same stream returns the same stream id.
-	// the same stream id.
 	StreamID() string
 
 	// Timestamp returns a timestamp when this event was generated.
 	Timestamp() time.Time
 }
 
-// EventStream is an abstraction that accepts a set of events produced
+// EventStream is an abstraction that accepts a set of events produced by mtg.
-// by mtg. Its main goal is to inject your logging or monitoring system.
+// Its main goal is to inject your logging or monitoring system.
 //
-// The idea is simple. When mtg works, it emits a set of events during
+// The idea is simple. When mtg works, it emits a set of events during a
-// a lifecycle of the requestor: EventStart, EventFinish etc. mtg is a
+// lifecycle of the requestor: EventStart, EventFinish etc. mtg is a producer
-// producer which puts these events into a stream. Responsibility of
+// which puts these events into a stream. Responsibility of the stream is to
-// the stream is to deliver this event to consumers/observers. There
+// deliver this event to consumers/observers. There might be many different
-// might be many different observers (for example, you want to have both
+// observers (for example, you want to have both statsd and prometheus), mtg
-// statsd and prometheus), mtg should know nothing about them.
+// should know nothing about them.
 type EventStream interface {
-	// Send delivers an event to observers. Given context has to be
+	// Send delivers an event to observers. Given context has to be respected. If
-	// respected. If the context is closed, all blocking operations should
+	// the context is closed, all blocking operations should be released ASAP.
-	// be released ASAP.
 	//
 	// It is possible that context is closed but the message is delivered.
 	// EventStream implementations should solve this issue somehow.
@@ -226,27 +217,26 @@ type EventStream interface {
 
 // Logger defines an interface of the logger used by mtglib.
 //
-// Each logger has a name. It is possible to stack names to organize
+// Each logger has a name. It is possible to stack names to organize poor-man
-// poor-man namespaces. Also, each logger must be able to bind
+// namespaces. Also, each logger must be able to bind parameters to avoid
-// parameters to avoid pushing them all the time.
+// pushing them all the time.
 //
 // Example
 //
-//     logger := SomeLogger{}
+//	logger := SomeLogger{} logger = logger.BindStr("ip", net.IP{127, 0, 0, 1})
-//     logger = logger.BindStr("ip", net.IP{127, 0, 0, 1})
 //	logger.Info("Hello")
 //
-// In that case, ip is bound as a parameter. It is a great idea to
+// In that case, ip is bound as a parameter. It is a great idea to put this
-// put this parameter somewhere in a log message.
+// parameter somewhere in a log message.
 //
-//     logger1 = logger.BindStr("param1", "11")
+//	logger1 = logger.BindStr("param1", "11") logger2 = logger.BindInt("param2",
-//     logger2 = logger.BindInt("param2", 11)
+//	11)
 //
 // logger1 should see no param2 and vice versa, logger2 should not see param1
 // If you attach a parameter to a logger, parents should not know about that.
 type Logger interface {
-	// Named returns a new logger with a bound name. Name chaining is
+	// Named returns a new logger with a bound name. Name chaining is allowed and
-	// allowed and appreciated.
+	// appreciated.
 	Named(name string) Logger
 
 	// BindInt binds new integer parameter to a new logger instance.
@@ -259,27 +249,26 @@ type Logger interface {
 	BindJSON(name, value string) Logger
 
 	// Printf is to support log.Logger behavior.
-	Printf(format string, args ...interface{})
+	Printf(format string, args ...any)
 
 	// Info puts a message about some normal situation.
 	Info(msg string)
 
-	// InfoError puts a message about some normal situation but this
+	// InfoError puts a message about some normal situation but this situation is
-	// situation is related to a given error.
+	// related to a given error.
 	InfoError(msg string, err error)
 
-	// Warning puts a message about some extraordinary situation
+	// Warning puts a message about some extraordinary situation worth to look at.
-	// worth to look at.
 	Warning(msg string)
 
-	// WarningError puts a message about some extraordinary situation
+	// WarningError puts a message about some extraordinary situation worth to
-	// worth to look at. This situation is related to a given error.
+	// look at. This situation is related to a given error.
 	WarningError(msg string, err error)
 
 	// Debug puts a message useful for debugging only.
 	Debug(msg string)
 
-	// Debug puts a message useful for debugging only. This message is
+	// Debug puts a message useful for debugging only. This message is related to
-	// related to a given error.
+	// a given error.
 	DebugError(msg string, err error)
 }

mtglib/init_internal_test.go

@@ -12,7 +12,7 @@ func (n NoopLogger) Named(_ string) Logger             { return n }
 func (n NoopLogger) BindInt(_ string, _ int) Logger { return n }
 func (n NoopLogger) BindStr(_, _ string) Logger     { return n }
 func (n NoopLogger) BindJSON(_, _ string) Logger    { return n }
-func (n NoopLogger) Printf(_ string, _ ...interface{}) {}
+func (n NoopLogger) Printf(_ string, _ ...any)      {}
 func (n NoopLogger) Info(_ string)                  {}
 func (n NoopLogger) Warning(_ string)               {}
 func (n NoopLogger) Debug(_ string)                 {}

mtglib/internal/dc/addr.go

@@ -0,0 +1,10 @@
+package dc
+
+type Addr struct {
+	Network string
+	Address string
+}
+
+func (d Addr) String() string {
+	return d.Address
+}

mtglib/internal/dc/addr_set.go

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

mtglib/internal/dc/addr_test.go

@@ -0,0 +1,16 @@
+package dc_test
+
+import (
+	"testing"
+
+	"github.com/9seconds/mtg/v2/mtglib/internal/dc"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAddr(t *testing.T) {
+	t.Parallel()
+
+	addr := dc.Addr{Network: "tcp4", Address: "127.0.0.1:443"}
+
+	assert.Equal(t, "127.0.0.1:443", addr.String())
+}

mtglib/internal/dc/init.go

@@ -0,0 +1,73 @@
+package dc
+
+type preferIP uint8
+
+const (
+	preferIPOnlyIPv4 preferIP = iota
+	preferIPOnlyIPv6
+	preferIPPreferIPv4
+	preferIPPreferIPv6
+)
+
+const (
+	DefaultDC = 2
+)
+
+type Logger interface {
+	Info(msg string)
+	WarningError(msg string, err error)
+}
+
+var (
+	// https://github.com/telegramdesktop/tdesktop/blob/master/Telegram/SourceFiles/mtproto/mtproto_dc_options.cpp#L30
+	defaultDCAddrSet = dcAddrSet{
+		v4: map[int][]Addr{
+			1: {
+				{Network: "tcp4", Address: "149.154.175.50:443"},
+			},
+			2: {
+				{Network: "tcp4", Address: "149.154.167.51:443"},
+				{Network: "tcp4", Address: "95.161.76.100:443"},
+			},
+			3: {
+				{Network: "tcp4", Address: "149.154.175.100:443"},
+			},
+			4: {
+				{Network: "tcp4", Address: "149.154.167.91:443"},
+			},
+			5: {
+				{Network: "tcp4", Address: "149.154.171.5:443"},
+			},
+		},
+		v6: map[int][]Addr{
+			1: {
+				{Network: "tcp6", Address: "[2001:b28:f23d:f001::a]:443"},
+			},
+			2: {
+				{Network: "tcp6", Address: "[2001:67c:04e8:f002::a]:443"},
+			},
+			3: {
+				{Network: "tcp6", Address: "[2001:b28:f23d:f003::a]:443"},
+			},
+			4: {
+				{Network: "tcp6", Address: "[2001:67c:04e8:f004::a]:443"},
+			},
+			5: {
+				{Network: "tcp6", Address: "[2001:b28:f23f:f005::a]:443"},
+			},
+		},
+	}
+
+	defaultDCOverridesAddrSet = dcAddrSet{
+		v4: map[int][]Addr{
+			203: {
+				{Network: "tcp4", Address: "91.105.192.100:443"},
+			},
+		},
+		v6: map[int][]Addr{
+			203: {
+				{Network: "tcp6", Address: "[2a0a:f280:0203:000a:5000:0000:0000:0100]:443"},
+			},
+		},
+	}
+)

mtglib/internal/dc/telegram.go

@@ -0,0 +1,79 @@
+package dc
+
+import (
+	"fmt"
+	"net"
+	"strings"
+)
+
+type Telegram struct {
+	view     dcView
+	preferIP preferIP
+}
+
+func (t *Telegram) GetAddresses(dc int) []Addr {
+	switch t.preferIP {
+	case preferIPOnlyIPv4:
+		return t.view.getV4(dc)
+	case preferIPOnlyIPv6:
+		return t.view.getV4(dc)
+	case preferIPPreferIPv4:
+		return append(t.view.getV4(dc), t.view.getV6(dc)...)
+	}
+
+	return append(t.view.getV6(dc), t.view.getV4(dc)...)
+}
+
+func New(ipPreference string, userOverrides map[int][]string) (*Telegram, error) {
+	var pref preferIP
+
+	switch strings.ToLower(ipPreference) {
+	case "prefer-ipv4":
+		pref = preferIPPreferIPv4
+	case "prefer-ipv6":
+		pref = preferIPPreferIPv6
+	case "only-ipv4":
+		pref = preferIPOnlyIPv4
+	case "only-ipv6":
+		pref = preferIPOnlyIPv6
+	default:
+		return nil, fmt.Errorf("unknown ip preference %s", ipPreference)
+	}
+
+	overrides := dcAddrSet{
+		v4: map[int][]Addr{},
+		v6: map[int][]Addr{},
+	}
+	for dc, addrs := range userOverrides {
+		for _, addr := range addrs {
+			host, _, err := net.SplitHostPort(addr)
+			if err != nil {
+				return nil, fmt.Errorf("incorrect host %s: %w", addr, err)
+			}
+
+			parsed := net.ParseIP(host)
+			if parsed == nil {
+				return nil, fmt.Errorf("incorrect host %s", addr)
+			}
+
+			if parsed.To4() != nil {
+				overrides.v4[dc] = append(overrides.v4[dc], Addr{
+					Network: "tcp4",
+					Address: addr,
+				})
+			} else {
+				overrides.v6[dc] = append(overrides.v6[dc], Addr{
+					Network: "tcp6",
+					Address: addr,
+				})
+			}
+		}
+	}
+
+	return &Telegram{
+		view: dcView{
+			overrides: overrides,
+		},
+		preferIP: pref,
+	}, nil
+}

mtglib/internal/dc/view.go

@@ -0,0 +1,21 @@
+package dc
+
+type dcView struct {
+	overrides dcAddrSet
+}
+
+func (d dcView) getV4(dc int) []Addr {
+	addrs := d.overrides.getV4(dc)
+	addrs = append(addrs, defaultDCOverridesAddrSet.getV4(dc)...)
+	addrs = append(addrs, defaultDCAddrSet.getV4(dc)...)
+
+	return addrs
+}
+
+func (d dcView) getV6(dc int) []Addr {
+	addrs := d.overrides.getV6(dc)
+	addrs = append(addrs, defaultDCOverridesAddrSet.getV6(dc)...)
+	addrs = append(addrs, defaultDCAddrSet.getV6(dc)...)
+
+	return addrs
+}

mtglib/internal/dc/view_test.go

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

mtglib/internal/faketls/client_hello.go

@@ -56,7 +56,7 @@ func ParseClientHello(secret, handshake []byte) (ClientHello, error) {
 	if len(handshake)-4 != int(handshakeLength) {
 		return hello,
 			fmt.Errorf("incorrect handshake size. manifested=%d, real=%d",
-				handshakeLength, len(handshake)-4) // nolint: gomnd
+				handshakeLength, len(handshake)-4)
 	}
 
 	copy(hello.Random[:], handshake[ClientHelloRandomOffset:])
@@ -76,7 +76,7 @@ func ParseClientHello(secret, handshake []byte) (ClientHello, error) {
 
 	computedRandom := mac.Sum(nil)
 
-	for i := 0; i < RandomLen; i++ {
+	for i := range RandomLen {
 		computedRandom[i] ^= hello.Random[i]
 	}
 
@@ -100,7 +100,7 @@ func parseSessionID(hello *ClientHello, handshake []byte) {
 }
 
 func parseCipherSuite(hello *ClientHello, handshake []byte) {
-	cipherSuiteOffset := ClientHelloSessionIDOffset + len(hello.SessionID) + 3 // nolint: gomnd
+	cipherSuiteOffset := ClientHelloSessionIDOffset + len(hello.SessionID) + 3
 	hello.CipherSuite = binary.BigEndian.Uint16(handshake[cipherSuiteOffset : cipherSuiteOffset+2])
 }
 

mtglib/internal/faketls/client_hello_fuzz_test.go

@@ -0,0 +1,21 @@
+package faketls_test
+
+import (
+	"testing"
+
+	"github.com/9seconds/mtg/v2/mtglib/internal/faketls"
+	"github.com/stretchr/testify/require"
+)
+
+var FuzzClientHelloSecret = []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+
+func FuzzClientHello(f *testing.F) {
+	f.Add([]byte{1, 2, 3})
+
+	f.Fuzz(func(t *testing.T, frame []byte) {
+		_, err := faketls.ParseClientHello(FuzzClientHelloSecret, frame)
+
+		// a probability of having != err is almost negligible
+		require.Error(t, err)
+	})
+}

mtglib/internal/faketls/conn.go

@@ -3,7 +3,7 @@ package faketls
 import (
 	"bytes"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 
 	"github.com/9seconds/mtg/v2/essentials"
 	"github.com/9seconds/mtg/v2/mtglib/internal/faketls/record"
@@ -53,7 +53,7 @@ func (c *Conn) Write(p []byte) (int, error) {
 	lenP := len(p)
 
 	for len(p) > 0 {
-		chunkSize := rand.Intn(record.TLSMaxRecordSize)
+		chunkSize := rand.IntN(record.TLSMaxRecordSize)
 		if chunkSize > len(p) || chunkSize == 0 {
 			chunkSize = len(p)
 		}

mtglib/internal/faketls/conn_test.go

@@ -2,9 +2,9 @@ package faketls_test
 
 import (
 	"bytes"
+	"crypto/rand"
 	"errors"
 	"io"
-	"math/rand"
 	"testing"
 
 	"github.com/9seconds/mtg/v2/internal/testlib"
@@ -123,7 +123,7 @@ func (suite *ConnTestSuite) TestWrite() {
 	suite.connMock.On("Write", mock.Anything).Return(0, nil)
 
 	dataToRec := make([]byte, record.TLSMaxRecordSize*2)
-	rand.Read(dataToRec)
+	rand.Read(dataToRec) //nolint: staticcheck, errcheck
 
 	n, err := suite.c.Write(dataToRec)
 	suite.NoError(err)

mtglib/internal/faketls/init.go

@@ -19,7 +19,7 @@ const (
 
 	// ClientHelloMinLen is a minimal possible length of
 	// ClientHello record.
-	ClientHelloMinLen = 4
+	ClientHelloMinLen = 6
 
 	// WelcomePacketRandomOffset is an offset of random in ServerHello
 	// packet (including record envelope).

mtglib/internal/faketls/pools.go

@@ -6,7 +6,7 @@ import (
 )
 
 var bytesBufferPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		return &bytes.Buffer{}
 	},
 }

mtglib/internal/faketls/record/pools.go

@@ -5,7 +5,7 @@ import (
 )
 
 var recordPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		return &Record{}
 	},
 }

mtglib/internal/faketls/welcome.go

@@ -6,7 +6,7 @@ import (
 	"crypto/sha256"
 	"encoding/binary"
 	"io"
-	mrand "math/rand"
+	mrand "math/rand/v2"
 
 	"github.com/9seconds/mtg/v2/mtglib/internal/faketls/record"
 	"golang.org/x/crypto/curve25519"
@@ -36,7 +36,7 @@ func SendWelcomePacket(writer io.Writer, secret []byte, clientHello ClientHello)
 	rec.Type = record.TypeApplicationData
 	rec.Version = record.Version12
 
-	if _, err := io.CopyN(&rec.Payload, rand.Reader, int64(1024+mrand.Intn(3092))); err != nil { // nolint: gomnd
+	if _, err := io.CopyN(&rec.Payload, rand.Reader, int64(1024+mrand.IntN(3092))); err != nil {
 		panic(err)
 	}
 

mtglib/internal/faketls/welcome_test.go

@@ -3,8 +3,8 @@ package faketls_test
 import (
 	"bytes"
 	"crypto/hmac"
+	"crypto/rand"
 	"crypto/sha256"
-	"math/rand"
 	"testing"
 	"time"
 
@@ -30,10 +30,10 @@ func (suite *WelcomeTestSuite) SetupTest() {
 		SessionID:   make([]byte, 32),
 	}
 
-	_, err := rand.Read(suite.h.SessionID)
+	_, err := rand.Read(suite.h.SessionID) //nolint: staticcheck
 	suite.NoError(err)
 
-	_, err = rand.Read(suite.h.Random[:])
+	_, err = rand.Read(suite.h.Random[:]) //nolint: staticcheck
 	suite.NoError(err)
 
 	suite.buf = &bytes.Buffer{}

mtglib/internal/obfuscated2/client_handshake_fuzz_internal_test.go

@@ -0,0 +1,32 @@
+package obfuscated2
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+var FuzzClientHandshakeSecret = []byte{1, 2, 3}
+
+func FuzzClientHandshake(f *testing.F) {
+	f.Add([]byte{1, 2, 3})
+
+	f.Fuzz(func(t *testing.T, frame []byte) {
+		data := bytes.NewReader(frame)
+
+		if _, _, _, err := ClientHandshake(FuzzClientHandshakeSecret, data); err != nil {
+			return
+		}
+
+		handshake := clientHandhakeFrame{}
+		require.Len(t, frame, handshakeFrameLen)
+
+		copy(handshake.data[:], frame)
+
+		decryptor := handshake.decryptor(FuzzClientHandshakeSecret)
+		decryptor.XORKeyStream(handshake.data[:], handshake.data[:])
+
+		require.Equal(t, handshakeConnectionType, handshake.connectionType())
+	})
+}

mtglib/internal/obfuscated2/handshake_frame.go

@@ -36,7 +36,7 @@ type handshakeFrame struct {
 }
 
 func (h *handshakeFrame) dc() int {
-	idx := int16(h.data[handshakeFrameOffsetDC]) | int16(h.data[handshakeFrameOffsetDC+1])<<8 // nolint: gomnd, lll // little endian for int16 is here
+	idx := int16(h.data[handshakeFrameOffsetDC]) | int16(h.data[handshakeFrameOffsetDC+1])<<8 //nolint: lll // little endian for int16 is here
 
 	switch {
 	case idx > 0:
@@ -63,7 +63,7 @@ func (h *handshakeFrame) connectionType() []byte {
 func (h *handshakeFrame) invert() handshakeFrame {
 	copyFrame := *h
 
-	for i := 0; i < handshakeFrameLenKey+handshakeFrameLenIV; i++ {
+	for i := range handshakeFrameLenKey + handshakeFrameLenIV {
 		copyFrame.data[handshakeFrameOffsetKey+i] = h.data[handshakeFrameOffsetConnectionType-1-i]
 	}
 

mtglib/internal/obfuscated2/init_test.go

@@ -1,12 +1,20 @@
 package obfuscated2_test
 
 import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
+	"testing"
+
+	"github.com/9seconds/mtg/v2/internal/testlib"
+	"github.com/9seconds/mtg/v2/mtglib/internal/obfuscated2"
+	"github.com/stretchr/testify/require"
 )
 
 type snapshotBytes struct {
@@ -50,6 +58,14 @@ type SnapshotTestSuite struct {
 	snapshots map[string]*Obfuscated2Snapshot
 }
 
+type ServerHandshakeTestData struct {
+	connMock *testlib.EssentialsConnMock
+
+	proxyConn obfuscated2.Conn
+	encryptor cipher.Stream
+	decryptor cipher.Stream
+}
+
 func (suite *SnapshotTestSuite) IngestSnapshots(dirname, namePrefix string) error {
 	suite.snapshots = map[string]*Obfuscated2Snapshot{}
 
@@ -81,3 +97,41 @@ func (suite *SnapshotTestSuite) IngestSnapshots(dirname, namePrefix string) erro
 
 	return nil
 }
+
+func NewServerHandshakeTestData(t *testing.T) ServerHandshakeTestData {
+	buf := &bytes.Buffer{}
+	connMock := &testlib.EssentialsConnMock{}
+
+	handshakeEnc, handshakeDec, err := obfuscated2.ServerHandshake(buf)
+	require.NoError(t, err)
+
+	serverEncrypted := buf.Bytes()
+	decBlock, _ := aes.NewCipher(serverEncrypted[8 : 8+32])
+	decryptor := cipher.NewCTR(decBlock, serverEncrypted[8+32:8+32+16])
+
+	serverDecrypted := make([]byte, len(serverEncrypted))
+	decryptor.XORKeyStream(serverDecrypted, serverEncrypted)
+
+	require.Equal(t, "3d3d3Q",
+		base64.RawStdEncoding.EncodeToString(serverDecrypted[8+32+16:8+32+16+4]))
+
+	serverEncryptedReverted := make([]byte, len(serverEncrypted))
+
+	for i := range 32 + 16 {
+		serverEncryptedReverted[8+i] = serverEncrypted[8+32+16-1-i]
+	}
+
+	encBlock, _ := aes.NewCipher(serverEncryptedReverted[8 : 8+32])
+	encryptor := cipher.NewCTR(encBlock, serverEncryptedReverted[8+32:8+32+16])
+
+	return ServerHandshakeTestData{
+		connMock: connMock,
+		proxyConn: obfuscated2.Conn{
+			Conn:      connMock,
+			Encryptor: handshakeEnc,
+			Decryptor: handshakeDec,
+		},
+		encryptor: encryptor,
+		decryptor: decryptor,
+	}
+}

mtglib/internal/obfuscated2/pools.go

@@ -9,12 +9,12 @@ import (
 
 var (
 	sha256HasherPool = sync.Pool{
-		New: func() interface{} {
+		New: func() any {
 			return sha256.New()
 		},
 	}
 	bytesBufferPool = sync.Pool{
-		New: func() interface{} {
+		New: func() any {
 			return &bytes.Buffer{}
 		},
 	}

mtglib/internal/obfuscated2/server_handshake.go

@@ -47,12 +47,12 @@ func generateServerHanshakeFrame() serverHandshakeFrame {
 			panic(err)
 		}
 
-		if frame.data[0] == 0xef { // nolint: gomnd // taken from tg sources
+		if frame.data[0] == 0xef { // taken from tg sources
 			continue
 		}
 
 		switch binary.LittleEndian.Uint32(frame.data[:4]) {
-		case 0x44414548, 0x54534f50, 0x20544547, 0x4954504f, 0xeeeeeeee: // nolint: gomnd // taken from tg sources
+		case 0x44414548, 0x54534f50, 0x20544547, 0x4954504f, 0xeeeeeeee: // taken from tg sources
 			continue
 		}
 

mtglib/internal/obfuscated2/server_handshake_fuzz_internal_test.go

@@ -0,0 +1,30 @@
+package obfuscated2
+
+import (
+	"encoding/binary"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func FuzzServerGenerateHandshakeFrame(f *testing.F) {
+	f.Fuzz(func(t *testing.T, arg int) {
+		frame := generateServerHanshakeFrame()
+
+		assert.NotEqualValues(t, 0xef, frame.data[0])
+
+		firstBytes := binary.LittleEndian.Uint32(frame.data[:4])
+		assert.NotEqualValues(t, 0x44414548, firstBytes)
+		assert.NotEqualValues(t, 0x54534f50, firstBytes)
+		assert.NotEqualValues(t, 0x20544547, firstBytes)
+		assert.NotEqualValues(t, 0x4954504f, firstBytes)
+		assert.NotEqualValues(t, 0xeeeeeeee, firstBytes)
+
+		assert.NotEqualValues(
+			t,
+			0,
+			frame.data[4]|frame.data[5]|frame.data[6]|frame.data[7])
+
+		assert.Equal(t, handshakeConnectionType, frame.connectionType())
+	})
+}

mtglib/internal/obfuscated2/server_handshake_fuzz_test.go

@@ -0,0 +1,58 @@
+package obfuscated2_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+)
+
+func FuzzServerSend(f *testing.F) {
+	f.Add([]byte{1, 2, 3, 4, 5})
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		handshakeData := NewServerHandshakeTestData(t)
+
+		handshakeData.connMock.
+			On("Write", mock.Anything).
+			Return(len(data), nil).
+			Once().
+			Run(func(args mock.Arguments) {
+				message := make([]byte, len(data))
+				handshakeData.decryptor.XORKeyStream(message, args.Get(0).([]byte)) //nolint: forcetypeassert
+				assert.Equal(t, message, data)
+			})
+
+		n, err := handshakeData.proxyConn.Write(data)
+
+		assert.EqualValues(t, len(data), n)
+		assert.NoError(t, err)
+		handshakeData.connMock.AssertExpectations(t)
+	})
+}
+
+func FuzzServerReceive(f *testing.F) {
+	f.Add([]byte{1, 2, 3, 4, 5})
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		handshakeData := NewServerHandshakeTestData(t)
+		buffer := make([]byte, len(data))
+
+		handshakeData.connMock.
+			On("Read", mock.Anything).
+			Return(len(data), nil).
+			Once().
+			Run(func(args mock.Arguments) {
+				message := make([]byte, len(data))
+				handshakeData.encryptor.XORKeyStream(message, data)
+				copy(args.Get(0).([]byte), message) //nolint: forcetypeassert
+			})
+
+		n, err := handshakeData.proxyConn.Read(buffer)
+
+		assert.EqualValues(t, len(data), n)
+		assert.NoError(t, err)
+		assert.Equal(t, data, buffer)
+		handshakeData.connMock.AssertExpectations(t)
+	})
+}

mtglib/internal/obfuscated2/server_handshake_test.go

@@ -1,14 +1,8 @@
 package obfuscated2_test
 
 import (
-	"bytes"
-	"crypto/aes"
-	"crypto/cipher"
-	"encoding/base64"
 	"testing"
 
-	"github.com/9seconds/mtg/v2/internal/testlib"
-	"github.com/9seconds/mtg/v2/mtglib/internal/obfuscated2"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/suite"
 )
@@ -16,64 +10,31 @@ import (
 type ServerHandshakeTestSuite struct {
 	suite.Suite
 
-	connMock  *testlib.EssentialsConnMock
+	data ServerHandshakeTestData
-	proxyConn obfuscated2.Conn
-	encryptor cipher.Stream
-	decryptor cipher.Stream
 }
 
 func (suite *ServerHandshakeTestSuite) SetupTest() {
-	buf := &bytes.Buffer{}
+	suite.data = NewServerHandshakeTestData(suite.T())
-	suite.connMock = &testlib.EssentialsConnMock{}
-
-	encryptor, decryptor, err := obfuscated2.ServerHandshake(buf)
-	suite.NoError(err)
-
-	suite.proxyConn = obfuscated2.Conn{
-		Conn:      suite.connMock,
-		Encryptor: encryptor,
-		Decryptor: decryptor,
-	}
-
-	serverEncrypted := buf.Bytes()
-
-	decBlock, _ := aes.NewCipher(serverEncrypted[8 : 8+32])
-	suite.decryptor = cipher.NewCTR(decBlock, serverEncrypted[8+32:8+32+16])
-
-	serverDecrypted := make([]byte, len(serverEncrypted))
-	suite.decryptor.XORKeyStream(serverDecrypted, serverEncrypted)
-
-	suite.Equal("3d3d3Q",
-		base64.RawStdEncoding.EncodeToString(serverDecrypted[8+32+16:8+32+16+4]))
-
-	serverEncryptedReverted := make([]byte, len(serverEncrypted))
-
-	for i := 0; i < 32+16; i++ {
-		serverEncryptedReverted[8+i] = serverEncrypted[8+32+16-1-i]
-	}
-
-	encBlock, _ := aes.NewCipher(serverEncryptedReverted[8 : 8+32])
-	suite.encryptor = cipher.NewCTR(encBlock, serverEncryptedReverted[8+32:8+32+16])
 }
 
 func (suite *ServerHandshakeTestSuite) TearDownTest() {
-	suite.connMock.AssertExpectations(suite.T())
+	suite.data.connMock.AssertExpectations(suite.T())
 }
 
 func (suite *ServerHandshakeTestSuite) TestSendToTelegram() {
 	messageToTelegram := []byte{10, 11, 12, 13, 14, 'a'}
 
-	suite.connMock.
+	suite.data.connMock.
 		On("Write", mock.Anything).
 		Return(len(messageToTelegram), nil).
 		Once().
 		Run(func(args mock.Arguments) {
 			message := make([]byte, len(messageToTelegram))
-			suite.decryptor.XORKeyStream(message, args.Get(0).([]byte)) // nolint: forcetypeassert
+			suite.data.decryptor.XORKeyStream(message, args.Get(0).([]byte)) //nolint: forcetypeassert
 			suite.Equal(messageToTelegram, message)
 		})
 
-	n, err := suite.proxyConn.Write(messageToTelegram)
+	n, err := suite.data.proxyConn.Write(messageToTelegram)
 	suite.EqualValues(len(messageToTelegram), n)
 	suite.NoError(err)
 }
@@ -82,17 +43,17 @@ func (suite *ServerHandshakeTestSuite) TestRecieveFromTelegram() {
 	messageFromTelegram := []byte{10, 11, 12, 13, 14, 'a'}
 	buffer := make([]byte, len(messageFromTelegram))
 
-	suite.connMock.
+	suite.data.connMock.
 		On("Read", mock.Anything).
 		Return(len(messageFromTelegram), nil).
 		Once().
 		Run(func(args mock.Arguments) {
 			message := make([]byte, len(messageFromTelegram))
-			suite.encryptor.XORKeyStream(message, messageFromTelegram)
+			suite.data.encryptor.XORKeyStream(message, messageFromTelegram)
 			copy(args.Get(0).([]byte), message) //nolint: forcetypeassert
 		})
 
-	n, err := suite.proxyConn.Read(buffer)
+	n, err := suite.data.proxyConn.Read(buffer)
 	suite.EqualValues(len(messageFromTelegram), n)
 	suite.NoError(err)
 	suite.Equal(messageFromTelegram, buffer)

mtglib/internal/relay/init.go

@@ -5,5 +5,5 @@ const (
 )
 
 type Logger interface {
-	Printf(msg string, args ...interface{})
+	Printf(msg string, args ...any)
 }

mtglib/internal/relay/init_test.go

@@ -2,4 +2,4 @@ package relay_test
 
 type loggerMock struct{}
 
-func (l loggerMock) Printf(format string, args ...interface{}) {}
+func (l loggerMock) Printf(format string, args ...any) {}

mtglib/internal/relay/pools.go

@@ -3,7 +3,7 @@ package relay
 import "sync"
 
 var copyBufferPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		rv := make([]byte, copyBufferSize)
 
 		return &rv

mtglib/internal/relay/relay.go

@@ -9,16 +9,16 @@ import (
 )
 
 func Relay(ctx context.Context, log Logger, telegramConn, clientConn essentials.Conn) {
-	defer telegramConn.Close()
+	defer telegramConn.Close() //nolint: errcheck
-	defer clientConn.Close()
+	defer clientConn.Close()   //nolint: errcheck
 
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
 	go func() {
 		<-ctx.Done()
-		telegramConn.Close()
+		telegramConn.Close() //nolint: errcheck
-		clientConn.Close()
+		clientConn.Close()   //nolint: errcheck
 	}()
 
 	closeChan := make(chan struct{})

mtglib/internal/telegram/address_pool.go

@@ -1,41 +0,0 @@
-package telegram
-
-import "math/rand"
-
-type addressPool struct {
-	v4 [][]tgAddr
-	v6 [][]tgAddr
-}
-
-func (a addressPool) isValidDC(dc int) bool {
-	return dc > 0 && dc <= len(a.v4) && dc <= len(a.v6)
-}
-
-func (a addressPool) getRandomDC() int {
-	return 1 + rand.Intn(len(a.v4))
-}
-
-func (a addressPool) getV4(dc int) []tgAddr {
-	return a.get(a.v4, dc-1)
-}
-
-func (a addressPool) getV6(dc int) []tgAddr {
-	return a.get(a.v6, dc-1)
-}
-
-func (a addressPool) get(addresses [][]tgAddr, dc int) []tgAddr {
-	if dc < 0 || dc >= len(addresses) {
-		return nil
-	}
-
-	rv := make([]tgAddr, len(addresses[dc]))
-	copy(rv, addresses[dc])
-
-	if len(rv) > 1 {
-		rand.Shuffle(len(rv), func(i, j int) {
-			rv[i], rv[j] = rv[j], rv[i]
-		})
-	}
-
-	return rv
-}

mtglib/internal/telegram/init.go

@@ -1,90 +0,0 @@
-package telegram
-
-import (
-	"context"
-	"errors"
-
-	"github.com/9seconds/mtg/v2/essentials"
-)
-
-var errNoAddresses = errors.New("no addresses")
-
-type preferIP uint8
-
-const (
-	preferIPOnlyIPv4 preferIP = iota
-	preferIPOnlyIPv6
-	preferIPPreferIPv4
-	preferIPPreferIPv6
-)
-
-type tgAddr struct {
-	network string
-	address string
-}
-
-// https://github.com/telegramdesktop/tdesktop/blob/master/Telegram/SourceFiles/mtproto/mtproto_dc_options.cpp#L30
-var (
-	productionV4Addresses = [][]tgAddr{
-		{ // dc1
-			{network: "tcp4", address: "149.154.175.50:443"},
-		},
-		{ // dc2
-			{network: "tcp4", address: "149.154.167.51:443"},
-			{network: "tcp4", address: "95.161.76.100:443"},
-		},
-		{ // dc3
-			{network: "tcp4", address: "149.154.175.100:443"},
-		},
-		{ // dc4
-			{network: "tcp4", address: "149.154.167.91:443"},
-		},
-		{ // dc5
-			{network: "tcp4", address: "149.154.171.5:443"},
-		},
-	}
-	productionV6Addresses = [][]tgAddr{
-		{ // dc1
-			{network: "tcp6", address: "[2001:b28:f23d:f001::a]:443"},
-		},
-		{ // dc2
-			{network: "tcp6", address: "[2001:67c:04e8:f002::a]:443"},
-		},
-		{ // dc3
-			{network: "tcp6", address: "[2001:b28:f23d:f003::a]:443"},
-		},
-		{ // dc4
-			{network: "tcp6", address: "[2001:67c:04e8:f004::a]:443"},
-		},
-		{ // dc5
-			{network: "tcp6", address: "[2001:b28:f23f:f005::a]:443"},
-		},
-	}
-
-	testV4Addresses = [][]tgAddr{
-		{ // dc1
-			{network: "tcp4", address: "149.154.175.10:443"},
-		},
-		{ // dc2
-			{network: "tcp4", address: "149.154.167.40:443"},
-		},
-		{ // dc3
-			{network: "tcp4", address: "149.154.175.117:443"},
-		},
-	}
-	testV6Addresses = [][]tgAddr{
-		{ // dc1
-			{network: "tcp6", address: "[2001:b28:f23d:f001::e]:443"},
-		},
-		{ // dc2
-			{network: "tcp6", address: "[2001:67c:04e8:f002::e]:443"},
-		},
-		{ // dc3
-			{network: "tcp6", address: "[2001:b28:f23d:f003::e]:443"},
-		},
-	}
-)
-
-type Dialer interface {
-	DialContext(ctx context.Context, network, address string) (essentials.Conn, error)
-}

mtglib/internal/telegram/telegram.go

@@ -1,83 +0,0 @@
-package telegram
-
-import (
-	"context"
-	"fmt"
-	"strings"
-
-	"github.com/9seconds/mtg/v2/essentials"
-)
-
-type Telegram struct {
-	dialer   Dialer
-	preferIP preferIP
-	pool     addressPool
-}
-
-func (t Telegram) Dial(ctx context.Context, dc int) (essentials.Conn, error) {
-	var addresses []tgAddr
-
-	switch t.preferIP {
-	case preferIPOnlyIPv4:
-		addresses = t.pool.getV4(dc)
-	case preferIPOnlyIPv6:
-		addresses = t.pool.getV6(dc)
-	case preferIPPreferIPv4:
-		addresses = append(t.pool.getV4(dc), t.pool.getV6(dc)...)
-	case preferIPPreferIPv6:
-		addresses = append(t.pool.getV6(dc), t.pool.getV4(dc)...)
-	}
-
-	var conn essentials.Conn
-
-	err := errNoAddresses
-
-	for _, v := range addresses {
-		conn, err = t.dialer.DialContext(ctx, v.network, v.address)
-		if err == nil {
-			return conn, nil
-		}
-	}
-
-	return nil, fmt.Errorf("cannot dial to %d dc: %w", dc, err)
-}
-
-func (t Telegram) IsKnownDC(dc int) bool {
-	return t.pool.isValidDC(dc)
-}
-
-func (t Telegram) GetFallbackDC() int {
-	return t.pool.getRandomDC()
-}
-
-func New(dialer Dialer, ipPreference string, useTestDCs bool) (*Telegram, error) {
-	var pref preferIP
-
-	switch strings.ToLower(ipPreference) {
-	case "prefer-ipv4":
-		pref = preferIPPreferIPv4
-	case "prefer-ipv6":
-		pref = preferIPPreferIPv6
-	case "only-ipv4":
-		pref = preferIPOnlyIPv4
-	case "only-ipv6":
-		pref = preferIPOnlyIPv6
-	default:
-		return nil, fmt.Errorf("unknown ip preference %s", ipPreference)
-	}
-
-	pool := addressPool{
-		v4: productionV4Addresses,
-		v6: productionV6Addresses,
-	}
-	if useTestDCs {
-		pool.v4 = testV4Addresses
-		pool.v6 = testV6Addresses
-	}
-
-	return &Telegram{
-		dialer:   dialer,
-		preferIP: pref,
-		pool:     pool,
-	}, nil
-}

mtglib/internal/telegram/telegram_internal_test.go

@@ -1,159 +0,0 @@
-package telegram
-
-import (
-	"context"
-	"errors"
-	"io"
-	"net"
-	"strconv"
-	"testing"
-
-	"github.com/9seconds/mtg/v2/internal/testlib"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/mock"
-	"github.com/stretchr/testify/suite"
-)
-
-type TelegramTestSuite struct {
-	suite.Suite
-
-	dialerMock *testlib.MtglibNetworkMock
-	t          *Telegram
-}
-
-func (suite *TelegramTestSuite) SetupTest() {
-	suite.dialerMock = &testlib.MtglibNetworkMock{}
-	suite.t, _ = New(suite.dialerMock, "prefer-ipv4", false)
-}
-
-func (suite *TelegramTestSuite) TearDownTest() {
-	suite.dialerMock.AssertExpectations(suite.T())
-}
-
-func (suite *TelegramTestSuite) TestUnknownDC() {
-	testData := []int{
-		-1,
-		0,
-		6,
-		100,
-	}
-
-	for _, v := range testData {
-		value := v
-
-		suite.T().Run(strconv.Itoa(value), func(t *testing.T) {
-			_, err := suite.t.Dial(context.Background(), value)
-			assert.Error(t, err)
-			assert.False(t, suite.t.IsKnownDC(value))
-		})
-	}
-}
-
-func (suite *TelegramTestSuite) TestDialToCorrectIPs() {
-	testData := map[int][]tgAddr{}
-
-	for i := 1; i <= 5; i++ {
-		testData[i] = []tgAddr{}
-		testData[i] = append(testData[i], productionV4Addresses[i-1]...)
-		testData[i] = append(testData[i], productionV6Addresses[i-1]...)
-	}
-
-	for i, v := range testData {
-		idx := i
-		addresses := v
-
-		suite.T().Run(strconv.Itoa(idx), func(t *testing.T) {
-			for _, addr := range addresses {
-				suite.dialerMock.
-					On("DialContext", mock.Anything, addr.network, addr.address).
-					Once().
-					Return((*net.TCPConn)(nil), io.EOF)
-			}
-
-			_, err := suite.t.Dial(context.Background(), idx)
-			assert.True(t, errors.Is(err, io.EOF))
-			assert.True(t, suite.t.IsKnownDC(idx))
-		})
-	}
-}
-
-func (suite *TelegramTestSuite) TestDialPreferIPRange() {
-	testData := map[string][]tgAddr{
-		"prefer-ipv4": {testV4Addresses[0][0], testV6Addresses[0][0]},
-		"prefer-ipv6": {testV6Addresses[0][0], testV4Addresses[0][0]},
-		"only-ipv4":   {testV4Addresses[0][0]},
-		"only-ipv6":   {testV6Addresses[0][0]},
-	}
-
-	for k, v := range testData {
-		name := k
-		addresses := v
-
-		suite.T().Run(name, func(t *testing.T) {
-			for _, addr := range addresses {
-				suite.dialerMock.
-					On("DialContext", mock.Anything, addr.network, addr.address).
-					Once().
-					Return((*net.TCPConn)(nil), io.EOF)
-			}
-
-			tg, _ := New(suite.dialerMock, name, true)
-			_, err := tg.Dial(context.Background(), 1)
-
-			assert.True(t, errors.Is(err, io.EOF))
-		})
-	}
-}
-
-func (suite *TelegramTestSuite) TestDialPreferIPPriority() {
-	testData := map[string]tgAddr{
-		"prefer-ipv4": productionV4Addresses[0][0],
-		"prefer-ipv6": productionV6Addresses[0][0],
-	}
-
-	for k, v := range testData {
-		name := k
-		addr := v
-
-		suite.T().Run(name, func(t *testing.T) {
-			conn := &net.TCPConn{}
-
-			suite.dialerMock.
-				On("DialContext", mock.Anything, addr.network, addr.address).
-				Once().
-				Return(conn, nil)
-
-			tg, _ := New(suite.dialerMock, name, false)
-
-			res, err := tg.Dial(context.Background(), 1)
-			assert.NoError(t, err)
-			assert.Equal(t, conn, res)
-		})
-	}
-}
-
-func (suite *TelegramTestSuite) TestUnknownPreferIP() {
-	_, err := New(suite.dialerMock, "xxx", false)
-	suite.Error(err)
-}
-
-func (suite *TelegramTestSuite) TestFallbackDC() {
-	dcs := make([]int, 10)
-
-	for i := 0; i < len(dcs); i++ {
-		dcs[i] = suite.t.GetFallbackDC()
-	}
-
-	for _, v := range dcs {
-		value := v
-
-		suite.T().Run(strconv.Itoa(value), func(t *testing.T) {
-			assert.True(t, suite.t.IsKnownDC(value))
-		})
-	}
-}
-
-func TestTelegram(t *testing.T) {
-	t.Parallel()
-	suite.Run(t, &TelegramTestSuite{})
-}

mtglib/proxy.go

@@ -10,11 +10,11 @@ import (
 	"time"
 
 	"github.com/9seconds/mtg/v2/essentials"
+	"github.com/9seconds/mtg/v2/mtglib/internal/dc"
 	"github.com/9seconds/mtg/v2/mtglib/internal/faketls"
 	"github.com/9seconds/mtg/v2/mtglib/internal/faketls/record"
 	"github.com/9seconds/mtg/v2/mtglib/internal/obfuscated2"
 	"github.com/9seconds/mtg/v2/mtglib/internal/relay"
-	"github.com/9seconds/mtg/v2/mtglib/internal/telegram"
 	"github.com/panjf2000/ants/v2"
 )
 
@@ -28,13 +28,13 @@ type Proxy struct {
 	tolerateTimeSkewness     time.Duration
 	domainFrontingPort       int
 	workerPool               *ants.PoolWithFunc
-	telegram                 *telegram.Telegram
+	telegram                 *dc.Telegram
 
 	secret          Secret
 	network         Network
 	antiReplayCache AntiReplayCache
 	blocklist       IPBlocklist
-	whitelist       IPBlocklist
+	allowlist       IPBlocklist
 	eventStream     EventStream
 	logger          Logger
 }
@@ -44,8 +44,8 @@ func (p *Proxy) DomainFrontingAddress() string {
 	return net.JoinHostPort(p.secret.Host, strconv.Itoa(p.domainFrontingPort))
 }
 
-// ServeConn serves a connection. We do not check IP blocklist and
+// ServeConn serves a connection. We do not check IP blocklist and concurrency
-// concurrency limit here.
+// limit here.
 func (p *Proxy) ServeConn(conn essentials.Conn) {
 	p.streamWaitGroup.Add(1)
 	defer p.streamWaitGroup.Done()
@@ -91,7 +91,7 @@ func (p *Proxy) ServeConn(conn essentials.Conn) {
 }
 
 // Serve starts a proxy on a given listener.
-func (p *Proxy) Serve(listener net.Listener) error { // nolint: cyclop
+func (p *Proxy) Serve(listener net.Listener) error {
 	p.streamWaitGroup.Add(1)
 	defer p.streamWaitGroup.Done()
 
@@ -109,16 +109,16 @@ func (p *Proxy) Serve(listener net.Listener) error { // nolint: cyclop
 		ipAddr := conn.RemoteAddr().(*net.TCPAddr).IP //nolint: forcetypeassert
 		logger := p.logger.BindStr("ip", ipAddr.String())
 
-		if p.whitelist != nil && !p.whitelist.Contains(ipAddr) {
+		if !p.allowlist.Contains(ipAddr) {
-			conn.Close()
+			conn.Close() //nolint: errcheck
-			logger.Info("ip was rejected by whitelist")
+			logger.Info("ip was rejected by allowlist")
-			p.eventStream.Send(p.ctx, NewEventIPBlocklisted(ipAddr))
+			p.eventStream.Send(p.ctx, NewEventIPAllowlisted(ipAddr))
 
 			continue
 		}
 
 		if p.blocklist.Contains(ipAddr) {
-			conn.Close()
+			conn.Close() //nolint: errcheck
 			logger.Info("ip was blacklisted")
 			p.eventStream.Send(p.ctx, NewEventIPBlocklisted(ipAddr))
 
@@ -138,17 +138,14 @@ func (p *Proxy) Serve(listener net.Listener) error { // nolint: cyclop
 	}
 }
 
-// Shutdown 'gracefully' shutdowns all connections. Please remember that
+// Shutdown 'gracefully' shutdowns all connections. Please remember that it
-// it does not close an underlying listener.
+// does not close an underlying listener.
 func (p *Proxy) Shutdown() {
 	p.ctxCancel()
 	p.streamWaitGroup.Wait()
 	p.workerPool.Release()
 
-	if p.whitelist != nil {
+	p.allowlist.Shutdown()
-		p.whitelist.Shutdown()
-	}
-
 	p.blocklist.Shutdown()
 }
 
@@ -222,23 +219,31 @@ func (p *Proxy) doObfuscated2Handshake(ctx *streamContext) error {
 }
 
 func (p *Proxy) doTelegramCall(ctx *streamContext) error {
-	dc := ctx.dc
+	dcid := ctx.dc
-
-	if p.allowFallbackOnUnknownDC && !p.telegram.IsKnownDC(dc) {
-		dc = p.telegram.GetFallbackDC()
-		ctx.logger = ctx.logger.BindInt("fallback_dc", dc)
 
+	addresses := p.telegram.GetAddresses(dcid)
+	if len(addresses) == 0 && p.allowFallbackOnUnknownDC {
+		ctx.logger = ctx.logger.BindInt("fallback_dc", dc.DefaultDC)
 		ctx.logger.Warning("unknown DC, fallbacks")
+		addresses = p.telegram.GetAddresses(dc.DefaultDC)
 	}
 
-	conn, err := p.telegram.Dial(ctx, dc)
+	var conn essentials.Conn
+	var err error
+
+	for _, addr := range addresses {
+		conn, err = p.network.Dial(addr.Network, addr.Address)
+		if err == nil {
+			break
+		}
+	}
 	if err != nil {
-		return fmt.Errorf("cannot dial to Telegram: %w", err)
+		return fmt.Errorf("no addresses to call: %w", err)
 	}
 
 	encryptor, decryptor, err := obfuscated2.ServerHandshake(conn)
 	if err != nil {
-		conn.Close()
+		conn.Close() //nolint: errcheck
 
 		return fmt.Errorf("cannot perform obfuscated2 handshake: %w", err)
 	}
@@ -295,9 +300,9 @@ func NewProxy(opts ProxyOpts) (*Proxy, error) {
 		return nil, fmt.Errorf("invalid settings: %w", err)
 	}
 
-	tg, err := telegram.New(opts.Network, opts.getPreferIP(), opts.UseTestDCs)
+	tg, err := dc.New(opts.getPreferIP(), opts.DCOverrides)
 	if err != nil {
-		return nil, fmt.Errorf("cannot build telegram dialer: %w", err)
+		return nil, fmt.Errorf("cannot build telegram dc fetcher: %w", err)
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -308,7 +313,7 @@ func NewProxy(opts ProxyOpts) (*Proxy, error) {
 		network:                  opts.Network,
 		antiReplayCache:          opts.AntiReplayCache,
 		blocklist:                opts.IPBlocklist,
-		whitelist:                opts.IPWhitelist,
+		allowlist:                opts.IPAllowlist,
 		eventStream:              opts.EventStream,
 		logger:                   opts.getLogger("proxy"),
 		domainFrontingPort:       opts.getDomainFrontingPort(),
@@ -318,7 +323,7 @@ func NewProxy(opts ProxyOpts) (*Proxy, error) {
 	}
 
 	pool, err := ants.NewPoolWithFunc(opts.getConcurrency(),
-		func(arg interface{}) {
+		func(arg any) {
 			proxy.ServeConn(arg.(essentials.Conn)) //nolint: forcetypeassert
 		},
 		ants.WithLogger(opts.getLogger("ants")),

mtglib/proxy_opts.go

@@ -4,16 +4,16 @@ import "time"
 
 // ProxyOpts is a structure with settings to mtg proxy.
 //
-// This is not required per se, but this is to shorten function
+// This is not required per se, but this is to shorten function signature and
-// signature and give an ability to conveniently provide default values.
+// give an ability to conveniently provide default values.
 type ProxyOpts struct {
 	// Secret defines a secret which should be used by a proxy.
 	//
 	// This is a mandatory setting.
 	Secret Secret
 
-	// Network defines a network instance which should be used for all
+	// Network defines a network instance which should be used for all network
-	// network communications made by proxies.
+	// communications made by proxies.
 	//
 	// This is a mandatory setting.
 	Network Network
@@ -28,10 +28,10 @@ type ProxyOpts struct {
 	// This is a mandatory setting.
 	IPBlocklist IPBlocklist
 
-	// IPWhitelist defines a whitelist of IPs to allow to use proxy.
+	// IPAllowlist defines a whitelist of IPs to allow to use proxy.
 	//
 	// This is an optional setting, ignored by default (no restrictions).
-	IPWhitelist IPBlocklist
+	IPAllowlist IPBlocklist
 
 	// EventStream defines an instance of event stream.
 	//
@@ -45,9 +45,8 @@ type ProxyOpts struct {
 
 	// BufferSize is a size of the copy buffer in bytes.
 	//
-	// Please remember that we multiply this number in 2, because when
+	// Please remember that we multiply this number in 2, because when we relay
-	// we relay between proxies, we have to create 2 intermediate
+	// between proxies, we have to create 2 intermediate buffers: to and from.
-	// buffers: to and from.
 	//
 	// This is an optional setting.
 	//
@@ -62,22 +61,20 @@ type ProxyOpts struct {
 	// This is an optional setting.
 	Concurrency uint
 
-	// IdleTimeout is a timeout for relay when we have to break a
+	// IdleTimeout is a timeout for relay when we have to break a stream.
-	// stream.
 	//
-	// This is a timeout for any activity. So, if we have any message
+	// This is a timeout for any activity. So, if we have any message which will
-	// which will pass to either direction, a timer is reset. If we have
+	// pass to either direction, a timer is reset. If we have no any reads or
-	// no any reads or writes for this timeout, a connection will be
+	// writes for this timeout, a connection will be aborted.
-	// aborted.
 	//
 	// This is an optional setting.
 	IdleTimeout time.Duration
 
-	// TolerateTimeSkewness is a time boundary that defines a time
+	// TolerateTimeSkewness is a time boundary that defines a time range where
-	// range where faketls timestamp is acceptable.
+	// faketls timestamp is acceptable.
 	//
-	// This means that if if you got a timestamp X, now is Y, then
+	// This means that if if you got a timestamp X, now is Y, then if |X-Y| <
-	// if |X-Y| < TolerateTimeSkewness, then you accept a packet.
+	// TolerateTimeSkewness, then you accept a packet.
 	//
 	// This is an optional setting.
 	TolerateTimeSkewness time.Duration
@@ -88,33 +85,40 @@ type ProxyOpts struct {
 	// This is an optional setting.
 	PreferIP string
 
-	// DomainFrontingPort is a port we use to connect to a fronting
+	// DomainFrontingPort is a port we use to connect to a fronting domain.
-	// domain.
 	//
-	// This is required because secret does not specify a port. It
+	// This is required because secret does not specify a port. It specifies a
-	// specifies a hostname only.
+	// hostname only.
 	//
 	// This is an optional setting.
 	DomainFrontingPort uint
 
 	// AllowFallbackOnUnknownDC defines how proxy behaves if unknown DC was
-	// requested. If this setting is set to false, then such connection
+	// requested. If this setting is set to false, then such connection will be
-	// will be rejected. Otherwise, proxy will chose any DC.
+	// rejected. Otherwise, proxy will chose any DC.
 	//
-	// Telegram is designed in a way that any DC can serve any request,
+	// Telegram is designed in a way that any DC can serve any request, the
-	// the problem is a latency.
+	// problem is a latency.
 	//
 	// This is an optional setting.
 	AllowFallbackOnUnknownDC bool
 
-	// UseTestDCs defines if we have to connect to production or to staging
+	// UseTestDCs defines if we have to connect to production or to staging DCs of
-	// DCs of Telegram.
+	// Telegram.
 	//
-	// This is required if you use mtglib as an integration library for
+	// This is required if you use mtglib as an integration library for your
-	// your Telegram-related projects.
+	// Telegram-related projects.
 	//
 	// This is an optional setting.
+	//
+	// OBSOLETE and DEPRECATED. Ignored.
 	UseTestDCs bool
+
+	// DCOverrides defines a set of IP addresses that should be used
+	// with a higher priority to those that are calculated somehow by mtg.
+	//
+	// This is an optional setting
+	DCOverrides map[int][]string
 }
 
 func (p ProxyOpts) valid() error {
@@ -125,6 +129,8 @@ func (p ProxyOpts) valid() error {
 		return ErrAntiReplayCacheIsNotDefined
 	case p.IPBlocklist == nil:
 		return ErrIPBlocklistIsNotDefined
+	case p.IPAllowlist == nil:
+		return ErrIPAllowlistIsNotDefined
 	case p.EventStream == nil:
 		return ErrEventStreamIsNotDefined
 	case p.Logger == nil:

mtglib/proxy_test.go

@@ -1,9 +1,7 @@
 package mtglib_test
 
 import (
-	"context"
 	"crypto/tls"
-	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -15,13 +13,12 @@ import (
 	"github.com/9seconds/mtg/v2/antireplay"
 	"github.com/9seconds/mtg/v2/events"
 	"github.com/9seconds/mtg/v2/ipblocklist"
+	"github.com/9seconds/mtg/v2/ipblocklist/files"
 	"github.com/9seconds/mtg/v2/logger"
 	"github.com/9seconds/mtg/v2/mtglib"
 	"github.com/9seconds/mtg/v2/network"
-	"github.com/gotd/td/telegram"
-	"github.com/gotd/td/telegram/dcs"
-	"github.com/gotd/td/tg"
 	"github.com/stretchr/testify/suite"
+	"github.com/yl2chen/cidranger"
 )
 
 type ProxyTestSuite struct {
@@ -49,11 +46,26 @@ func (suite *ProxyTestSuite) SetupSuite() {
 	ntw, err := network.NewNetwork(dialer, "mtgtest", "1.1.1.1", 0)
 	suite.NoError(err)
 
+	allowlist, _ := ipblocklist.NewFireholFromFiles(
+		logger.NewNoopLogger(),
+		1,
+		[]files.File{
+			files.NewMem([]*net.IPNet{
+				cidranger.AllIPv4,
+				cidranger.AllIPv6,
+			}),
+		},
+		nil,
+	)
+
+	go allowlist.Run(time.Second)
+
 	suite.opts = &mtglib.ProxyOpts{
 		Secret:          mtglib.GenerateSecret("httpbin.org"),
 		Network:         ntw,
 		AntiReplayCache: antireplay.NewNoop(),
 		IPBlocklist:     ipblocklist.NewNoop(),
+		IPAllowlist:     allowlist,
 		EventStream:     events.NewNoopStream(),
 		Logger:          logger.NewNoopLogger(),
 		UseTestDCs:      true,
@@ -74,7 +86,7 @@ func (suite *ProxyTestSuite) SetupSuite() {
 
 func (suite *ProxyTestSuite) TearDownSuite() {
 	if suite.listener != nil {
-		suite.listener.Close()
+		suite.listener.Close() //nolint: errcheck
 	}
 
 	if suite.p != nil {
@@ -114,6 +126,14 @@ func (suite *ProxyTestSuite) TestCannotInitNoIPBlocklist() {
 	suite.Error(err)
 }
 
+func (suite *ProxyTestSuite) TestCannotInitNoIPAllowlist() {
+	opts := *suite.opts
+	opts.IPAllowlist = nil
+
+	_, err := mtglib.NewProxy(opts)
+	suite.Error(err)
+}
+
 func (suite *ProxyTestSuite) TestCannotInitNoEventStream() {
 	opts := *suite.opts
 	opts.EventStream = nil
@@ -157,7 +177,7 @@ func (suite *ProxyTestSuite) TestHTTPSRequest() {
 	resp, err := client.Get(addr) //nolint: noctx
 	suite.NoError(err)
 
-	defer resp.Body.Close()
+	defer resp.Body.Close() //nolint: errcheck
 
 	suite.Equal(http.StatusOK, resp.StatusCode)
 
@@ -174,32 +194,6 @@ func (suite *ProxyTestSuite) TestHTTPSRequest() {
 	suite.NotEmpty(jsonStruct.Headers.TraceID)
 }
 
-func (suite *ProxyTestSuite) TestMakeRealRequest() {
-	secret, _ := hex.DecodeString(suite.opts.Secret.Hex())
-	resolver, err := dcs.MTProxyResolver(
-		suite.ProxyAddress(),
-		secret,
-		dcs.MTProxyOptions{},
-	)
-	suite.NoError(err)
-
-	tgClient := telegram.NewClient(telegram.TestAppID,
-		telegram.TestAppHash,
-		telegram.Options{
-			Resolver: resolver,
-		})
-
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-	defer cancel()
-
-	suite.NoError(tgClient.Run(ctx, func(ctx context.Context) error {
-		_, err := tg.NewClient(tgClient).HelpGetConfig(ctx)
-		suite.NoError(err)
-
-		return err // nolint: wrapcheck
-	}))
-}
-
 func TestProxy(t *testing.T) {
 	t.Parallel()
 	suite.Run(t, &ProxyTestSuite{})

mtglib/secret.go

@@ -21,24 +21,23 @@ var secretEmptyKey [SecretKeyLength]byte
 //	|-|-------------------------------|-------------------------------------------
 //	p key                             hostname
 //
-// Serialized secret starts with 'ee'. Actually, in the past we also had
+// Serialized secret starts with 'ee'. Actually, in the past we also had 'dd'
-// 'dd' secrets and prefixless ones. But this is history. Currently,
+// secrets and prefixless ones. But this is history. Currently, we do have only
-// we do have only 'ee' secrets which mean faketls + protection from
+// 'ee' secrets which mean faketls + protection from statistical attacks on a
-// statistical attacks on a length. 'ee' is a byte 238 (0xee).
+// length. 'ee' is a byte 238 (0xee).
 //
-// After that, we have 16 bytes of the key. This is a random generated
+// After that, we have 16 bytes of the key. This is a random generated secret
-// secret data of the proxy and this data is used to derive
+// data of the proxy and this data is used to derive authentication schemas.
-// authentication schemas. These secrets are mixed into hmacs and sha256
+// These secrets are mixed into hmacs and sha256 checksums which are used to
-// checksums which are used to build AEAD ciphers for obfuscated2
+// build AEAD ciphers for obfuscated2 protocol and ensure faketls handshake.
-// protocol and ensure faketls handshake.
 //
-// Host is a domain fronting hostname in latin1 (ASCII) encoding. This
+// Host is a domain fronting hostname in latin1 (ASCII) encoding. This hostname
-// hostname should be used for SNI in faketls and MTG verifies it. Also,
+// should be used for SNI in faketls and MTG verifies it. Also, this is when
-// this is when mtg gets about a domain fronting hostname.
+// mtg gets about a domain fronting hostname.
 //
-// Secrets can be serialized into 2 forms: hex and base64. If
+// Secrets can be serialized into 2 forms: hex and base64. If you decode both
-// you decode both forms into bytes, you'll get the same byte array.
+// forms into bytes, you'll get the same byte array. Telegram clients nowadays
-// Telegram clients nowadays accept all forms.
+// accept all forms.
 type Secret struct {
 	// Key is a set of bytes used for traffic authentication.
 	Key [SecretKeyLength]byte
@@ -75,7 +74,7 @@ func (s *Secret) Set(text string) error {
 		return fmt.Errorf("incorrect secret format: %w", err)
 	}
 
-	if len(decoded) < 2 { // nolint: gomnd // we need at least 1 byte here
+	if len(decoded) < 2 { // we need at least 1 byte here
 		return fmt.Errorf("secret is truncated, length=%d", len(decoded))
 	}
 

mtglib/stream_context.go

@@ -32,7 +32,7 @@ func (s *streamContext) Err() error {
 	return s.ctx.Err() //nolint: wrapcheck
 }
 
-func (s *streamContext) Value(key interface{}) interface{} {
+func (s *streamContext) Value(key any) any {
 	return s.ctx.Value(key)
 }
 
@@ -40,11 +40,11 @@ func (s *streamContext) Close() {
 	s.ctxCancel()
 
 	if s.clientConn != nil {
-		s.clientConn.Close()
+		s.clientConn.Close() //nolint: errcheck
 	}
 
 	if s.telegramConn != nil {
-		s.telegramConn.Close()
+		s.telegramConn.Close() //nolint: errcheck
 	}
 }
 

mtglib/stream_context_internal_test.go

@@ -24,7 +24,7 @@ func (suite *StreamContextTestSuite) SetupSuite() {
 
 func (suite *StreamContextTestSuite) SetupTest() {
 	ctx, cancel := context.WithCancel(context.Background())
-	ctx = context.WithValue(ctx, "key", "value") // nolint: golint, revive, staticcheck
+	ctx = context.WithValue(ctx, "key", "value") //nolint: staticcheck
 
 	suite.ctxCancel = cancel
 	suite.connMock = &testlib.EssentialsConnMock{}

network/circuit_breaker.go

@@ -36,7 +36,8 @@ func (c *circuitBreakerDialer) Dial(network, address string) (essentials.Conn, e
 }
 
 func (c *circuitBreakerDialer) DialContext(ctx context.Context,
-	network, address string) (essentials.Conn, error) {
+	network, address string,
+) (essentials.Conn, error) {
 	switch atomic.LoadUint32(&c.state) {
 	case circuitBreakerStateClosed:
 		return c.doClosed(ctx, network, address)
@@ -48,13 +49,14 @@ func (c *circuitBreakerDialer) DialContext(ctx context.Context,
 }
 
 func (c *circuitBreakerDialer) doClosed(ctx context.Context,
-	network, address string) (essentials.Conn, error) {
+	network, address string,
+) (essentials.Conn, error) {
 	conn, err := c.Dialer.DialContext(ctx, network, address)
 
 	select {
 	case <-ctx.Done():
 		if conn != nil {
-			conn.Close()
+			conn.Close() //nolint: errcheck
 		}
 
 		return nil, ctx.Err() //nolint: wrapcheck
@@ -80,7 +82,8 @@ func (c *circuitBreakerDialer) doClosed(ctx context.Context,
 }
 
 func (c *circuitBreakerDialer) doHalfOpened(ctx context.Context,
-	network, address string) (essentials.Conn, error) {
+	network, address string,
+) (essentials.Conn, error) {
 	if !atomic.CompareAndSwapUint32(&c.halfOpenAttempts, 0, 1) {
 		return nil, ErrCircuitBreakerOpened
 	}
@@ -90,7 +93,7 @@ func (c *circuitBreakerDialer) doHalfOpened(ctx context.Context,
 	select {
 	case <-ctx.Done():
 		if conn != nil {
-			conn.Close()
+			conn.Close() //nolint: errcheck
 		}
 
 		return nil, ctx.Err() //nolint: wrapcheck
@@ -174,14 +177,16 @@ func (c *circuitBreakerDialer) stopTimer(timerRef **time.Timer) {
 }
 
 func (c *circuitBreakerDialer) ensureTimer(timerRef **time.Timer,
-	timeout time.Duration, callback func()) {
+	timeout time.Duration, callback func(),
+) {
 	if *timerRef == nil {
 		*timerRef = time.AfterFunc(timeout, callback)
 	}
 }
 
 func newCircuitBreakerDialer(baseDialer Dialer,
-	openThreshold uint32, halfOpenTimeout, resetFailuresTimeout time.Duration) Dialer {
+	openThreshold uint32, halfOpenTimeout, resetFailuresTimeout time.Duration,
+) Dialer {
 	cb := &circuitBreakerDialer{
 		Dialer:               baseDialer,
 		stateMutexChan:       make(chan bool, 1),

network/circuit_breaker_internal_test.go

@@ -52,17 +52,9 @@ func (suite *CircuitBreakerTestSuite) TestMultipleRunsOk() {
 		Return(suite.connMock, nil)
 
 	wg := &sync.WaitGroup{}
-	wg.Add(5)
-
-	go func() {
-		wg.Wait()
-		suite.ctxCancel()
-	}()
-
-	for i := 0; i < 5; i++ {
-		go func() {
-			defer wg.Done()
 
+	for range 5 {
+		wg.Go(func() {
 			conn, err := suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1")
 
 			suite.mutex.Lock()
@@ -70,9 +62,14 @@ func (suite *CircuitBreakerTestSuite) TestMultipleRunsOk() {
 
 			suite.NoError(err)
 			suite.Equal("127.0.0.1:3128", conn.RemoteAddr().String())
-		}()
+		})
 	}
 
+	go func() {
+		wg.Wait()
+		suite.ctxCancel()
+	}()
+
 	suite.Eventually(func() bool {
 		_, ok := <-suite.ctx.Done()
 

network/default.go

@@ -31,7 +31,7 @@ func (d *defaultDialer) DialContext(ctx context.Context, network, address string
 
 	// we do not need to call to end user. End users call us.
 	if err := SetServerSocketOptions(conn, 0); err != nil {
-		conn.Close()
+		conn.Close() //nolint: errcheck
 
 		return nil, fmt.Errorf("cannot set socket options: %w", err)
 	}

network/default_test.go

@@ -51,7 +51,7 @@ func (suite *DefaultDialerTestSuite) TestConnectOk() {
 	suite.NoError(err)
 	suite.NotNil(conn)
 
-	conn.Close()
+	conn.Close() //nolint: errcheck
 }
 
 func (suite *DefaultDialerTestSuite) TestHTTPRequest() {
@@ -59,7 +59,7 @@ func (suite *DefaultDialerTestSuite) TestHTTPRequest() {
 
 	resp, err := httpClient.Get(suite.MakeURL("/get")) //nolint: noctx
 	if err == nil {
-		defer resp.Body.Close()
+		defer resp.Body.Close() //nolint: errcheck
 	}
 
 	suite.NoError(err)