Align buildinfo with master

Update dependencies
Update to go 1.19
2026-08-31 12:24:03 +03:00 · 2022-08-09 17:43:29 +03:00 · 2022-08-09 17:42:31 +03:00 · 2022-08-09 17:41:59 +03:00 · 2022-03-21 14:32:11 +03:00 · 2022-03-21 14:30:06 +03:00
87 changed files with 1319 additions and 787 deletions
@@ -1,3 +1,9 @@
-version.go
 vendor/
 tags
+.github/
+.bin/
+*.md
+mtg
+.golangci.toml
+.gitignore
+run.sh
@@ -0,0 +1,131 @@
+---
+
+name: CI
+
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - master
+      - stable
+      - v1
+  release:
+    types:
+      - published
+      - released
+  pull_request:
+    types:
+      - opened
+      - edited
+      - reopened
+      - synchronize
+      - ready_for_review
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    strategy:
+      matrix:
+        go_version:
+          - ^1.19
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        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 ./...
+
+      - name: Collect coverage
+        uses: codecov/codecov-action@v1
+        with:
+          file: ./coverage.txt
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - name: Run linter
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.48.0
+
+  docker:
+    name: Docker
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - name: Get Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v1
+        with:
+          images: nineseconds/mtg,ghcr.io/9seconds/mtg
+          tag-semver: "{{version}},{{major}},{{major}}.{{minor}}"
+
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Setup BuildX
+        uses: docker/setup-buildx-action@v1
+
+      - name: Setup cache
+        uses: actions/cache@v2
+        with:
+          path: /tmp/buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Login to GHCR.io
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GH_PAT }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          pull: true
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/386,linux/arm/v7,linux/arm/v6
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          cache-from: type=local,src=/tmp/buildx-cache
+          cache-to: type=local,dest=/tmp/buildx-cache
@@ -0,0 +1,69 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: 
+      - master
+      - stable
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '24 20 * * 5'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1
@@ -7,5 +7,5 @@
 *.out
 mtg
 vendor/
-version.go
-ccbuilds/
+.bin/
+dist/
@@ -3,11 +3,20 @@ concurrency = 4
 deadline = "2m"
 tests = true
 skip-dirs = ["vendor"]
-skip-files = ["version.go"]

 [output]
 format = "colored-line-number"

 [linters]
 enable-all = true
-disable = ["gochecknoglobals", "gomnd"]
+disable = [
+    "containedctx",
+    "exhaustivestruct",
+    "exhaustruct",
+    "gas",
+    "gochecknoglobals",
+    "goerr113",
+    "ireturn",
+    "thelper",
+    "varnamelen",
+]
@@ -0,0 +1,65 @@
+---
+
+project_name: mtg
+
+before:
+  hooks:
+    - go mod tidy
+    - go generate ./...
+
+builds:
+  - binary: '{{ .ProjectName }}'
+    goos:
+      - darwin
+      - freebsd
+      - linux
+      - netbsd
+      - openbsd
+    goarch:
+      - 386
+      - amd64
+      - arm
+      - arm64
+    goarm:
+      - 6
+      - 7
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -trimpath
+      - -mod=readonly
+    ldflags: -s -w -X main.version={{ .Version }}
+    ignore:
+      - goos: darwin
+        goarch: 386
+      - goos: freebsd
+        goarch: arm64
+      - goos: netbsd
+        goarch: arm64
+      - goos: openbsd
+        goarch: arm64
+
+archives:
+  - name_template: '{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
+    format: tar.gz
+    wrap_in_directory: true
+    format_overrides:
+      - goos: windows
+        format: zip
+    files:
+      - LICENSE
+      - README.md
+      - SECURITY.md
+
+gomod:
+  proxy: true
+
+snapshot:
+  name_template: '{{ .Version }}'
+
+checksum:
+  name_template: '{{ .ProjectName }}-{{ .Version }}-checksums.txt'
+
+source:
+  enabled: true
+  name_template: '{{ .ProjectName }}-sources'
@@ -1,20 +0,0 @@
---
-
-language: go
-sudo: false
-dist: trusty
-
-go:
-  - 1.13.x
-  - master
-
-before_script: make prepare
-
-script:
-  - make all
-  - make lint
-
-matrix:
-  allow_failures:
-    - go: master
-    - go: 1.14.x  # because of golangci-lint
@@ -1,7 +1,7 @@
 ###############################################################################
 # BUILD STAGE

-FROM golang:1.14-alpine
+FROM golang:1.19-alpine AS build

 RUN set -x \
  && apk --no-cache --update add \
@@ -9,15 +9,13 @@ RUN set -x \
    ca-certificates \
    curl \
    git \
-    make \
-    upx
+    make

-COPY . /go/src/github.com/9seconds/mtg/
+COPY . /app
+WORKDIR /app

 RUN set -x \
-  && cd /go/src/github.com/9seconds/mtg \
-  && make -j 4 static \
-  && upx --ultra-brute -qq ./mtg
+  && make -j 4 static


 ###############################################################################
@@ -26,11 +24,9 @@ RUN set -x \
 FROM scratch

 ENTRYPOINT ["/mtg"]
-ENV MTG_IP=0.0.0.0 \
-    MTG_PORT=3128 \
-    MTG_STATS_IP=0.0.0.0 \
-    MTG_STATS_PORT=3129
+ENV MTG_BIND=0.0.0.0:3128 \
+    MTG_STATS_BIND=0.0.0.0:3129
 EXPOSE 3128 3129

-COPY --from=0 /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY --from=0 /go/src/github.com/9seconds/mtg/mtg /mtg
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=build /app/mtg /mtg
@@ -2,58 +2,41 @@ ROOT_DIR     := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
 IMAGE_NAME   := mtg
 APP_NAME     := $(IMAGE_NAME)

-CC_BINARIES  := $(shell bash -c "echo -n $(APP_NAME)-{linux,freebsd,openbsd}-{386,amd64} $(APP_NAME)-linux-{arm,arm64}")
-
-GOLANGCI_LINT_VERSION := v1.24.0
+GOLANGCI_LINT_VERSION := v1.48.0

 VERSION_GO         := $(shell go version)
 VERSION_DATE       := $(shell date -Ru)
 VERSION_TAG        := $(shell git describe --tags --always)
-COMMON_BUILD_FLAGS := -ldflags="-s -w -X 'main.version=$(VERSION_TAG) ($(VERSION_GO)) [$(VERSION_DATE)]'"
+COMMON_BUILD_FLAGS := -trimpath -mod=readonly -ldflags="-s -w -X 'main.version=$(VERSION_TAG) ($(VERSION_GO)) [$(VERSION_DATE)]'"

-MOD_ON  := env GO111MODULE=on
-MOD_OFF := env GO111MODULE=auto
-
-# -----------------------------------------------------------------------------
-
-$(APP_NAME):
-	@$(MOD_ON) go build $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
-
-static-$(APP_NAME):
-	@$(MOD_ON) env CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
-
-$(APP_NAME)-%: GOOS=$(shell echo -n "$@" | sed 's?$(APP_NAME)-??' | cut -f1 -d-)
-$(APP_NAME)-%: GOARCH=$(shell echo -n "$@" | sed 's?$(APP_NAME)-??' | cut -f2 -d-)
-$(APP_NAME)-%: ccbuilds
-	@$(MOD_ON) env "GOOS=$(GOOS)" "GOARCH=$(GOARCH)" \
-		go build \
-		$(COMMON_BUILD_FLAGS) \
-		-o "./ccbuilds/$(APP_NAME)-$(GOOS)-$(GOARCH)"
-
-ccbuilds:
-	@rm -rf ./ccbuilds && mkdir -p ./ccbuilds
-
-vendor: go.mod go.sum
-	@$(MOD_ON) go mod vendor
+GOBIN  := $(ROOT_DIR)/.bin
+GOTOOL := env "GOBIN=$(GOBIN)" "PATH=$(ROOT_DIR)/.bin:$(PATH)"

 # -----------------------------------------------------------------------------

 .PHONY: all
-all: $(APP_NAME)
+all: build
+
+.PHONY: build
+build:
+	@go build $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
+
+$(APP_NAME): build

 .PHONY: static
-static: static-$(APP_NAME)
+static:
+	@env CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"

-.PHONY: crosscompile
-crosscompile: $(CC_BINARIES)
+vendor: go.mod go.sum
+	@$(MOD_ON) go mod vendor

-.PHONY: crosscompile-dir
-crosscompile-dir:
-	@rm -rf "$(CC_DIR)" && mkdir -p "$(CC_DIR)"
+.PHONY: test
+test:
+	@go test -v ./...

-.PHONY: lint
-lint: vendor
-	@$(MOD_OFF) golangci-lint run
+.PHONY: citest
+citest:
+	@go test -coverprofile=coverage.txt -covermode=atomic -race -v ./...

 .PHONY: clean
 clean:
@@ -61,14 +44,50 @@ clean:
 		git reset --hard >/dev/null && \
 		git submodule foreach --recursive sh -c 'git clean -xfd && git reset --hard' >/dev/null

+.PHONY: lint
+lint:
+	@$(GOTOOL) golangci-lint run
+
 .PHONY: docker
 docker:
 	@docker build --pull -t "$(IMAGE_NAME)" "$(ROOT_DIR)"

-.PHONY: prepare
-prepare: install-lint
+.PHONY: doc
+doc:
+	@$(GOTOOL) godoc -http 0.0.0.0:10000

-.PHONY: install-lint
-install-lint:
-	@curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh \
-		| $(MOD_OFF) bash -s -- -b $(GOPATH)/bin $(GOLANGCI_LINT_VERSION)
+.PHONY: fmt
+fmt:
+	@$(GOTOOL) gofumpt -w -extra "$(ROOT_DIR)"
+
+.PHONY: release
+release:
+	@$(GOTOOL) goreleaser release --snapshot --rm-dist && \
+		find "$(ROOT_DIR)/dist" -type d | grep -vP "dist$$" | xargs -r rm -rf && \
+		rm -f "$(ROOT_DIR)/dist/config.yaml"
+
+.PHONY: install-tools
+install-tools: install-tools-lint install-tools-godoc install-tools-gofumpt install-tools-goreleaser
+
+.PHONY: install-tools-lint
+install-tools-lint:
+	@mkdir -p "$(GOBIN)" || true && \
+		curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh \
+		| bash -s -- -b "$(GOBIN)" "$(GOLANGCI_LINT_VERSION)"
+
+.PHONY: install-tools-godoc
+install-tools-godoc:
+	@mkdir -p "$(GOBIN)" || true && \
+		$(GOTOOL) go get -u golang.org/x/tools/cmd/godoc
+
+.PHONY: install-tools-gofumpt
+install-tools-gofumpt: .bin
+	@$(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=1.18
@@ -189,8 +189,7 @@ supported environment variables:
 | `MTG_IPV6`                    | `-6`, `--public-ipv6`        | [Autodetect](https://ifconfig.co) | IPv6 address:port of this proxy. This is required if you NAT your proxy or run it in a docker container. In that case, you absolutely need to specify public IPv6 address of the proxy, otherwise either URLs will be broken or proxy could not access Telegram middle proxies. |
 | `MTG_STATS_BIND`              | `-t`, `--stats-bind`         | `127.0.0.1:3129`                  | Which hist:port should we bind the internal statistics HTTP server (Prometheus).                                                                                                                                                                                                |
 | `MTG_STATS_NAMESPACE`         | `--stats-namespace`          | `mtg`                             | Which namespace should be used for prometheus metrics.                                                                                                                                                                                                                          |
-| `MTG_STATSD_ADDR`             | `--statsd-addr`              |                                   | IP:host addresses of statsd service. No defaults, by defaults we do not send anything there.                                                                                                                                                                                    |
-| `MTG_STATSD_PORT`             | `--statsd-port`              | `8125`                            | Which port should we use to work with statsd.                                                                                                                                                                                                                                   |
+| `MTG_STATSD_ADDR`             | `--statsd-addr`              |                                   | host:port of statsd service. No defaults, by default we do not send anything there.                                                                                                                                                                                             |
 | `MTG_STATSD_PREFIX`           | `--statsd-prefix`            | `mtg`                             | Which bucket prefix we should use. For example, if you set `mtg`, then metric `traffic.ingress` would be send as `mtg.traffic.ingress`.                                                                                                                                         |
 | `MTG_STATSD_TAGS_FORMAT`      | `--statsd-tags-format`       |                                   | Which tags format we should use. By default, we are using default vanilla statsd tags format but if you want to send directly to InfluxDB or Datadog, please specify it there. Possible options are `influxdb` and `datadog`.                                                   |
 | `MTG_STATSD_TAGS`             | `--statsd-tags`              |                                   | Which tags should we send to statsd with our metrics. Please specify them as `key=value` pairs.                                                                                                                                                                                 |
@@ -0,0 +1,24 @@
+# Security Policy
+
+## Supported Versions
+
+We support 2 tracks: 2.x and 1.x
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.x     | :white_check_mark: |
+| 1.x     | :interrobang:      |
+| < 1.0   | :x:                |
+
+1.x has adtag support. We do not plan any active development there but we guarantee:
+
+1. Regular dependency updates
+2. Updates for Golang versions
+3. Security vulnerability fixes
+4. Merging small PRs
+
+2.x is in active development and have a full support.
+
+## Reporting a Vulnerability
+
+If you have found a vulnerability, please report about it to nineseconds@yandex.ru, telegram @9seconds or here in issues
@@ -3,9 +3,8 @@ package antireplay
 import (
 	"sync"

-	"github.com/VictoriaMetrics/fastcache"
-
 	"github.com/9seconds/mtg/config"
+	"github.com/VictoriaMetrics/fastcache"
 )

 type CacheInterface interface {
@@ -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)))
+}
@@ -5,9 +5,6 @@ import (
 	"os"
 	"time"

-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
-
 	"github.com/9seconds/mtg/antireplay"
 	"github.com/9seconds/mtg/config"
 	"github.com/9seconds/mtg/faketls"
@@ -18,9 +15,11 @@ import (
 	"github.com/9seconds/mtg/stats"
 	"github.com/9seconds/mtg/telegram"
 	"github.com/9seconds/mtg/utils"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 )

-func Proxy() error { // nolint: funlen
+func Proxy() error { //nolint: funlen,cyclop
 	ctx := utils.GetSignalContext()

 	atom := zap.NewAtomicLevel()
@@ -42,7 +41,7 @@ func Proxy() error { // nolint: funlen
 	))

 	zap.ReplaceGlobals(logger)
-	defer logger.Sync() // nolint: errcheck
+	defer logger.Sync() //nolint: errcheck

 	if err := config.InitPublicAddress(ctx); err != nil {
 		Fatal(err)
@@ -9,7 +9,7 @@ import (

 func Fatal(arg interface{}) {
 	if value, ok := arg.(error); ok {
-		arg = fmt.Errorf("fatal error: %+v", value)
+		arg = fmt.Errorf("fatal error: %+v", value) //nolint: errorlint
 	}

 	PrintStderr(arg)
@@ -21,7 +21,7 @@ func PrintStderr(args ...interface{}) {
 }

 func PrintStdout(args ...interface{}) {
-	fmt.Println(args...)
+	fmt.Println(args...) //nolint: forbidigo
 }

 func PrintJSONStderr(data interface{}) {
@@ -22,6 +22,8 @@ func (s SecretMode) String() string {
 		return "simple"
 	case SecretModeSecured:
 		return "secured"
+	case SecretModeTLS:
+		return "tls"
 	}

 	return "tls"
@@ -77,29 +79,29 @@ const (

 type Config struct {
 	Bind             *net.TCPAddr      `json:"bind"`
-	PublicIPv4       *net.TCPAddr      `json:"public_ipv4"`
-	PublicIPv6       *net.TCPAddr      `json:"public_ipv6"`
-	StatsBind        *net.TCPAddr      `json:"stats_bind"`
-	StatsdAddr       *net.TCPAddr      `json:"stats_addr"`
-	StatsdTagsFormat *statsd.TagFormat `json:"statsd_tags_format"`
+	PublicIPv4       *net.TCPAddr      `json:"public_ipv4"`        //nolint: tagliatelle
+	PublicIPv6       *net.TCPAddr      `json:"public_ipv6"`        //nolint: tagliatelle
+	StatsBind        *net.TCPAddr      `json:"stats_bind"`         //nolint: tagliatelle
+	StatsdAddr       *net.TCPAddr      `json:"stats_addr"`         //nolint: tagliatelle
+	StatsdTagsFormat *statsd.TagFormat `json:"statsd_tags_format"` //nolint: tagliatelle

-	StatsNamespace string            `json:"stats_namespace"`
-	CloakHost      string            `json:"cloak_host"`
-	StatsdTags     map[string]string `json:"statsd_tags"`
+	StatsNamespace string            `json:"stats_namespace"` //nolint: tagliatelle
+	CloakHost      string            `json:"cloak_host"`      //nolint: tagliatelle
+	StatsdTags     map[string]string `json:"statsd_tags"`     //nolint: tagliatelle

-	WriteBuffer int `json:"write_buffer"`
-	ReadBuffer  int `json:"read_buffer"`
-	CloakPort   int `json:"cloak_port"`
+	WriteBuffer int `json:"write_buffer"` //nolint: tagliatelle
+	ReadBuffer  int `json:"read_buffer"`  //nolint: tagliatelle
+	CloakPort   int `json:"cloak_port"`   //nolint: tagliatelle

-	AntiReplayMaxSize int `json:"anti_replay_max_size"`
+	AntiReplayMaxSize int `json:"anti_replay_max_size"` //nolint: tagliatelle

-	MultiplexPerConnection int `json:"multiplex_per_connection"`
+	MultiplexPerConnection int `json:"multiplex_per_connection"` //nolint: tagliatelle

 	Debug      bool       `json:"debug"`
 	Verbose    bool       `json:"verbose"`
-	SecretMode SecretMode `json:"secret_mode"`
-	PreferIP   PreferIP   `json:"prefer_ip"`
-	NTPServers []string   `json:"ntp_servers"`
+	SecretMode SecretMode `json:"secret_mode"` //nolint: tagliatelle
+	PreferIP   PreferIP   `json:"prefer_ip"`   //nolint: tagliatelle
+	NTPServers []string   `json:"ntp_servers"` //nolint: tagliatelle

 	Secret []byte `json:"secret"`
 	AdTag  []byte `json:"adtag"`
@@ -144,7 +146,7 @@ func (c *Config) adjustProxyValue(value int) int {

 	fvalue := float64(value)

-	newValue := fvalue * 2 * math.Log(float64(c.MultiplexPerConnection))
+	newValue := fvalue * 2 * math.Log(float64(c.MultiplexPerConnection)) //nolint: gomnd
 	newValue = math.Ceil(newValue)
 	newValue = math.Max(fvalue, newValue)

@@ -158,15 +160,15 @@ type Opt struct {

 var C = Config{}

-func Init(options ...Opt) error { // nolint: gocyclo, funlen
+func Init(options ...Opt) error { //nolint: gocyclo, funlen, cyclop
 	for _, opt := range options {
 		switch opt.Option {
 		case OptionTypeDebug:
-			C.Debug = opt.Value.(bool)
+			C.Debug = opt.Value.(bool) //nolint: forcetypeassert
 		case OptionTypeVerbose:
-			C.Verbose = opt.Value.(bool)
+			C.Verbose = opt.Value.(bool) //nolint: forcetypeassert
 		case OptionTypePreferIP:
-			value := opt.Value.(string)
+			value := opt.Value.(string) //nolint: forcetypeassert
 			switch value {
 			case "ipv4":
 				C.PreferIP = PreferIPv4
@@ -176,25 +178,25 @@ func Init(options ...Opt) error { // nolint: gocyclo, funlen
 				return fmt.Errorf("incorrect direct IP mode %s", value)
 			}
 		case OptionTypeBind:
-			C.Bind = opt.Value.(*net.TCPAddr)
+			C.Bind = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
 		case OptionTypePublicIPv4:
-			C.PublicIPv4 = opt.Value.(*net.TCPAddr)
+			C.PublicIPv4 = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
 			if C.PublicIPv4 == nil {
 				C.PublicIPv4 = &net.TCPAddr{}
 			}
 		case OptionTypePublicIPv6:
-			C.PublicIPv6 = opt.Value.(*net.TCPAddr)
+			C.PublicIPv6 = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
 			if C.PublicIPv6 == nil {
 				C.PublicIPv6 = &net.TCPAddr{}
 			}
 		case OptionTypeStatsBind:
-			C.StatsBind = opt.Value.(*net.TCPAddr)
+			C.StatsBind = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
 		case OptionTypeStatsNamespace:
-			C.StatsNamespace = opt.Value.(string)
+			C.StatsNamespace = opt.Value.(string) //nolint: forcetypeassert
 		case OptionTypeStatsdAddress:
-			C.StatsdAddr = opt.Value.(*net.TCPAddr)
+			C.StatsdAddr = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
 		case OptionTypeStatsdTagsFormat:
-			value := opt.Value.(string)
+			value := opt.Value.(string) //nolint: forcetypeassert
 			switch value {
 			case "datadog":
 				C.StatsdTagsFormat = statsd.TagFormatDatadog
@@ -204,26 +206,26 @@ func Init(options ...Opt) error { // nolint: gocyclo, funlen
 				return fmt.Errorf("incorrect statsd tag %s", value)
 			}
 		case OptionTypeStatsdTags:
-			C.StatsdTags = opt.Value.(map[string]string)
+			C.StatsdTags = opt.Value.(map[string]string) //nolint: forcetypeassert
 		case OptionTypeWriteBufferSize:
-			C.WriteBuffer = int(opt.Value.(units.Base2Bytes))
+			C.WriteBuffer = int(opt.Value.(units.Base2Bytes)) //nolint: forcetypeassert
 		case OptionTypeReadBufferSize:
-			C.ReadBuffer = int(opt.Value.(units.Base2Bytes))
+			C.ReadBuffer = int(opt.Value.(units.Base2Bytes)) //nolint: forcetypeassert
 		case OptionTypeCloakPort:
-			C.CloakPort = int(opt.Value.(uint16))
+			C.CloakPort = int(opt.Value.(uint16)) //nolint: forcetypeassert
 		case OptionTypeAntiReplayMaxSize:
-			C.AntiReplayMaxSize = int(opt.Value.(units.Base2Bytes))
+			C.AntiReplayMaxSize = int(opt.Value.(units.Base2Bytes)) //nolint: forcetypeassert
 		case OptionTypeMultiplexPerConnection:
-			C.MultiplexPerConnection = int(opt.Value.(uint))
+			C.MultiplexPerConnection = int(opt.Value.(uint)) //nolint: forcetypeassert
 		case OptionTypeNTPServers:
-			C.NTPServers = opt.Value.([]string)
+			C.NTPServers = opt.Value.([]string) //nolint: forcetypeassert
 			if len(C.NTPServers) == 0 {
 				return errors.New("ntp server list is empty")
 			}
 		case OptionTypeSecret:
-			C.Secret = opt.Value.([]byte)
+			C.Secret = opt.Value.([]byte) //nolint: forcetypeassert
 		case OptionTypeAdtag:
-			C.AdTag = opt.Value.([]byte)
+			C.AdTag = opt.Value.([]byte) //nolint: forcetypeassert
 		default:
 			return fmt.Errorf("unknown tag %v", opt.Option)
 		}
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"strings"
@@ -41,12 +40,12 @@ func fetchIP(ctx context.Context, network string) (net.IP, error) {
 		Timeout: ifconfigTimeout,
 		Transport: &http.Transport{
 			DialContext: func(ctx context.Context, _, addr string) (net.Conn, error) {
-				return dialer.DialContext(ctx, network, addr)
+				return dialer.DialContext(ctx, network, addr) //nolint: wrapcheck
 			},
 		},
 	}

-	req, err := http.NewRequest("GET", ifconfigAddress, nil)
+	req, err := http.NewRequest(http.MethodGet, ifconfigAddress, nil)
 	if err != nil {
 		return nil, fmt.Errorf("cannot create a request: %w", err)
 	}
@@ -54,15 +53,15 @@ func fetchIP(ctx context.Context, network string) (net.IP, error) {
 	resp, err := client.Do(req.WithContext(ctx))
 	if err != nil {
 		if resp != nil {
-			io.Copy(ioutil.Discard, resp.Body) // nolint: errcheck
+			io.Copy(io.Discard, resp.Body) //nolint: errcheck
 		}

 		return nil, fmt.Errorf("cannot perform a request: %w", err)
 	}

-	defer resp.Body.Close() // nolint: errcheck
+	defer resp.Body.Close()

-	respDataBytes, err := ioutil.ReadAll(resp.Body)
+	respDataBytes, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response body: %w", err)
 	}
@@ -8,20 +8,21 @@ import (
 )

 type URLs struct {
-	TG        string `json:"tg_url"`
-	TMe       string `json:"tme_url"`
-	TGQRCode  string `json:"tg_qrcode"`
-	TMeQRCode string `json:"tme_qrcode"`
+	TG        string `json:"tg_url"`     //nolint: tagliatelle
+	TMe       string `json:"tme_url"`    //nolint: tagliatelle
+	TGQRCode  string `json:"tg_qrcode"`  //nolint: tagliatelle
+	TMeQRCode string `json:"tme_qrcode"` //nolint: tagliatelle
 }

 type IPURLs struct {
-	IPv4      URLs   `json:"ipv4"`
-	IPv6      URLs   `json:"ipv6"`
-	BotSecret string `json:"secret_for_mtproxybot"`
+	IPv4      *URLs  `json:"ipv4,omitempty"`
+	IPv6      *URLs  `json:"ipv6,omitempty"`
+	BotSecret string `json:"secret_for_mtproxybot"` //nolint: tagliatelle
 }

-func GetURLs() (urls IPURLs) {
+func GetURLs() IPURLs {
 	secret := ""
+	urls := IPURLs{}

 	switch C.SecretMode {
 	case SecretModeSimple:
@@ -32,25 +33,33 @@ func GetURLs() (urls IPURLs) {
 		secret = "ee" + hex.EncodeToString(C.Secret) + hex.EncodeToString([]byte(C.CloakHost))
 	}

-	urls.IPv4 = makeURLs(C.PublicIPv4, secret)
-	urls.IPv6 = makeURLs(C.PublicIPv6, secret)
+	if C.PublicIPv4.IP != nil {
+		urls.IPv4 = makeURLs(C.PublicIPv4, secret)
+	}
+
+	if C.PublicIPv6.IP != nil {
+		urls.IPv6 = makeURLs(C.PublicIPv6, secret)
+	}
+
 	urls.BotSecret = hex.EncodeToString(C.Secret)

 	return urls
 }

-func makeURLs(addr *net.TCPAddr, secret string) (urls URLs) {
+func makeURLs(addr *net.TCPAddr, secret string) *URLs {
+	urls := &URLs{}
+
 	values := url.Values{}
 	values.Set("server", addr.IP.String())
 	values.Set("port", strconv.Itoa(addr.Port))
 	values.Set("secret", secret)

-	urls.TG = makeTGURL(values)
-	urls.TMe = makeTMeURL(values)
-	urls.TGQRCode = makeQRCodeURL(urls.TG)
-	urls.TMeQRCode = makeQRCodeURL(urls.TG)
-
-	return
+	return &URLs{
+		TG:        makeTGURL(values),
+		TMe:       makeTMeURL(values),
+		TGQRCode:  makeQRCodeURL(urls.TG),
+		TMeQRCode: makeQRCodeURL(urls.TMe),
+	}
 }

 func makeTGURL(values url.Values) string {
@@ -8,6 +8,8 @@ func (c ConnectionProtocol) String() string {
 		return "any"
 	case ConnectionProtocolIPv4:
 		return "ipv4"
+	case ConnectionProtocolIPv6:
+		return "ipv6"
 	}

 	return "ipv6"
@@ -21,7 +21,9 @@ func (t ConnectionType) Tag() []byte {
 		return ConnectionTagAbridged
 	case ConnectionTypeIntermediate:
 		return ConnectionTagIntermediate
-	default:
+	case ConnectionTypeSecure, ConnectionTypeUnknown:
 		return ConnectionTagSecure
 	}
+
+	return ConnectionTagSecure
 }
@@ -2,6 +2,7 @@ package faketls

 import (
 	"bufio"
+	"bytes"
 	"encoding/binary"
 	"errors"
 	"fmt"
@@ -48,13 +49,13 @@ func (c *ClientProtocol) Handshake(socket conntypes.StreamReadWriteCloser) (conn
 	}

 	conn := stream.NewFakeTLS(socket)
-	conn, err := c.ClientProtocol.Handshake(conn)

+	conn, err := c.ClientProtocol.Handshake(conn)
 	if err != nil {
-		return nil, err
+		return nil, err //nolint: wrapcheck
 	}

-	return conn, err
+	return conn, err //nolint: wrapcheck
 }

 func (c *ClientProtocol) tlsHandshake(conn io.ReadWriter) error {
@@ -63,9 +64,7 @@ func (c *ClientProtocol) tlsHandshake(conn io.ReadWriter) error {
 		return fmt.Errorf("cannot read initial record: %w", err)
 	}

-	buf := acquireBytesBuffer()
-	defer releaseBytesBuffer(buf)
-
+	buf := &bytes.Buffer{}
 	helloRecord.Data.WriteBytes(buf)

 	clientHello, err := tlstypes.ParseClientHello(buf.Bytes())
@@ -90,6 +89,7 @@ func (c *ClientProtocol) tlsHandshake(conn io.ReadWriter) error {

 	if antireplay.Cache.HasTLS(clientHello.Random[:]) {
 		stats.Stats.ReplayDetected()
+
 		return errors.New("replay attack is detected")
 	}

@@ -108,8 +108,8 @@ func (c *ClientProtocol) cloakHost(clientConn io.ReadWriteCloser) {
 	stats.Stats.CloakedRequest()

 	addr := net.JoinHostPort(config.C.CloakHost, strconv.Itoa(config.C.CloakPort))
-	hostConn, err := net.Dial("tcp", addr)

+	hostConn, err := net.Dial("tcp", addr)
 	if err != nil {
 		return
 	}
@@ -26,7 +26,7 @@ func cloak(one, another io.ReadWriteCloser) {
 	another = rwc.NewPing(ctx, another, channelPing)
 	wg := &sync.WaitGroup{}

-	wg.Add(2)
+	wg.Add(2) //nolint: gomnd

 	go cloakPipe(one, another, wg)

@@ -53,9 +53,11 @@ func cloak(one, another io.ReadWriteCloser) {
 				return
 			case <-lastActivityTimer.C:
 				cancel()
+
 				return
 			case <-maxTimer.C:
 				cancel()
+
 				return
 			}
 		}
@@ -67,8 +69,5 @@ func cloak(one, another io.ReadWriteCloser) {
 func cloakPipe(one io.Writer, another io.Reader, wg *sync.WaitGroup) {
 	defer wg.Done()

-	buf := acquireCloakBuffer()
-	defer releaseCloakBuffer(buf)
-
-	io.CopyBuffer(one, another, *buf) // nolint: errcheck
+	io.Copy(one, another) //nolint: errcheck
 }
@@ -1,39 +0,0 @@
-package faketls
-
-import (
-	"bytes"
-	"sync"
-)
-
-const cloakBufferSize = 1024
-
-var (
-	poolBytesBuffer = sync.Pool{
-		New: func() interface{} {
-			return &bytes.Buffer{}
-		},
-	}
-	poolCloakBuffer = sync.Pool{
-		New: func() interface{} {
-			rv := make([]byte, cloakBufferSize)
-			return &rv
-		},
-	}
-)
-
-func acquireBytesBuffer() *bytes.Buffer {
-	return poolBytesBuffer.Get().(*bytes.Buffer)
-}
-
-func acquireCloakBuffer() *[]byte {
-	return poolCloakBuffer.Get().(*[]byte)
-}
-
-func releaseBytesBuffer(buf *bytes.Buffer) {
-	buf.Reset()
-	poolBytesBuffer.Put(buf)
-}
-
-func releaseCloakBuffer(buf *[]byte) {
-	poolCloakBuffer.Put(buf)
-}
@@ -1,21 +1,31 @@
 module github.com/9seconds/mtg

-go 1.13
+go 1.18

 require (
-	github.com/VictoriaMetrics/fastcache v1.5.7
-	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d
+	github.com/VictoriaMetrics/fastcache v1.10.0
+	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137
 	github.com/beevik/ntp v0.3.0
-	github.com/golang/protobuf v1.3.5 // indirect
-	github.com/prometheus/client_golang v1.5.1
-	github.com/prometheus/procfs v0.0.11 // indirect
-	github.com/smira/go-statsd v1.3.1
-	go.uber.org/zap v1.14.1
-	golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59
-	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
-	golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e // indirect
-	golang.org/x/sys v0.0.0-20200327173247-9dae0f8f5775
-	golang.org/x/tools v0.0.0-20200319210407-521f4a0cd458 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/prometheus/client_golang v1.13.0
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
+	github.com/smira/go-statsd v1.3.2
+	go.uber.org/multierr v1.8.0 // indirect
+	go.uber.org/zap v1.22.0
+	golang.org/x/crypto v0.0.0-20220722155217-630584e8d5aa
+	golang.org/x/net v0.0.0-20220809012201-f428fae20770 // indirect
+	golang.org/x/sys v0.0.0-20220808155132-1c4a2a72c664 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
-	honnef.co/go/tools v0.0.1-2020.1.3 // indirect
+)
+
+require (
+	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
 )
@@ -1,65 +1,159 @@
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+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=
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-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
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-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
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 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 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 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+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/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+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=
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 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.0.1-2020.1.3 h1:sXmLre5bzIR6ypkjXCDI3jHPssRhc8KD/Ome589sc3U=
 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/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=
@@ -6,12 +6,11 @@ import (
 	"sync"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/mtproto"
 	"github.com/9seconds/mtg/mtproto/rpc"
 	"github.com/9seconds/mtg/protocol"
+	"go.uber.org/zap"
 )

 const connectionTTL = time.Hour
@@ -31,7 +30,7 @@ type connection struct {
 	channelConnDetach chan conntypes.ConnID
 }

-func (c *connection) run() {
+func (c *connection) run() { //nolint: cyclop
 	defer c.Close()

 	ttl := time.NewTimer(connectionTTL)
@@ -90,6 +89,7 @@ func (c *connection) readLoop() {
 		response, err := rpc.ParseProxyResponse(packet)
 		if err != nil {
 			c.logger.Debugw("Failed response", "error", err)
+
 			continue
 		}

@@ -148,7 +148,7 @@ func newConnection(req *protocol.TelegramRequest) (*connection, error) {
 		return nil, fmt.Errorf("cannot create a new connection: %w", err)
 	}

-	id := rand.Int() // nolint: gosec
+	id := rand.Int() //nolint: gosec
 	rv := &connection{
 		conn: conn,
 		id:   id,
@@ -25,6 +25,7 @@ func (c *connectionList) get(conn *ProxyConn) (*connection, error) {

 	if err = newConn.Attach(conn); err != nil {
 		newConn.Close()
+
 		return nil, fmt.Errorf("cannot attach to the newly created connection: %w", err)
 	}

@@ -18,7 +18,7 @@ func (h *hub) Register(req *protocol.TelegramRequest) (*ProxyConn, error) {
 }

 func (h *hub) getMux(req *protocol.TelegramRequest) *mux {
-	var key int32 = 32767 + int32(req.ClientProtocol.DC()) + 100000*int32(req.ClientProtocol.ConnectionProtocol())
+	key := 32767 + int32(req.ClientProtocol.DC()) + 100000*int32(req.ClientProtocol.ConnectionProtocol()) //nolint: gomnd

 	h.mutex.RLock()
 	m, ok := h.muxes[key]
@@ -3,19 +3,13 @@ package main
 import (
 	"math/rand"
 	"os"
-	"runtime/debug"
-	"strings"
 	"time"

-	kingpin "gopkg.in/alecthomas/kingpin.v2"
-
 	"github.com/9seconds/mtg/cli"
 	"github.com/9seconds/mtg/config"
-	"github.com/9seconds/mtg/utils"
+	kingpin "gopkg.in/alecthomas/kingpin.v2"
 )

-var version = "dev" // has to be set by ldflags
-
 var (
 	app = kingpin.New("mtg", "Simple MTPROTO proxy.")

@@ -129,10 +123,6 @@ func main() {
 	app.Version(getVersion())
 	app.HelpFlag.Short('h')

-	if err := utils.SetLimits(); err != nil {
-		cli.Fatal(err)
-	}
-
 	switch kingpin.MustParse(app.Parse(os.Args[1:])) {
 	case generateSecretCommand.FullCommand():
 		cli.Generate(*generateSecretType, *generateCloakHost)
@@ -167,25 +157,3 @@ func main() {
 		}
 	}
 }
-
-func getVersion() string {
-	if version != "dev" {
-		return version
-	}
-
-	info, ok := debug.ReadBuildInfo()
-	if !ok {
-		return version
-	}
-
-	builder := strings.Builder{}
-	builder.WriteString(info.Main.Version)
-
-	if info.Main.Sum != "" {
-		builder.WriteString(" (checksum: ")
-		builder.WriteString(info.Main.Sum)
-		builder.WriteRune(')')
-	}
-
-	return builder.String()
-}
@@ -19,8 +19,8 @@ func TelegramProtocol(req *protocol.TelegramRequest) (conntypes.PacketReadWriteC
 	}

 	rpcNonceConn := packet.NewMtprotoFrame(conn, rpc.SeqNoNonce)
-	rpcNonceReq, err := doRPCNonceRequest(rpcNonceConn)

+	rpcNonceReq, err := doRPCNonceRequest(rpcNonceConn)
 	if err != nil {
 		return nil, fmt.Errorf("cannot do nonce request: %w", err)
 	}
@@ -51,7 +51,7 @@ func doRPCNonceRequest(conn conntypes.BasePacketWriter) (*rpc.NonceRequest, erro
 	}

 	if err := conn.Write(rpcNonceReq.Bytes()); err != nil {
-		return nil, err
+		return nil, err //nolint: wrapcheck
 	}

 	return rpcNonceReq, nil
@@ -7,7 +7,7 @@ const (
 	SeqNoHandshake = -1
 )

-// Different constants for RPC protocol
+// Different constants for RPC protocol.
 var (
 	TagCloseExt     = []byte{0xa2, 0x34, 0xb6, 0x5e}
 	TagProxyAns     = []byte{0x0d, 0xda, 0x03, 0x44}
@@ -17,10 +17,10 @@ type HandshakeResponse struct {
 func (r *HandshakeResponse) Bytes() []byte {
 	buf := &bytes.Buffer{}

-	buf.Write(r.Type)      // nolint: gosec
-	buf.Write(r.Flags)     // nolint: gosec
-	buf.Write(r.SenderPID) // nolint: gosec
-	buf.Write(r.PeerPID)   // nolint: gosec
+	buf.Write(r.Type)
+	buf.Write(r.Flags)
+	buf.Write(r.SenderPID)
+	buf.Write(r.PeerPID)

 	return buf.Bytes()
 }
@@ -41,7 +41,7 @@ func (r *HandshakeResponse) Valid() error {
 // NewHandshakeResponse constructs new handshake response from the given
 // data.
 func NewHandshakeResponse(data []byte) (*HandshakeResponse, error) {
-	if len(data) != 32 {
+	if len(data) != 32 { //nolint: gomnd
 		return nil, fmt.Errorf("incorrect handshake response length %d", len(data))
 	}

@@ -29,17 +29,17 @@ func (r *NonceRequest) Bytes() []byte {

 // NewNonceRequest builds new none request based on proxy secret.
 func NewNonceRequest(proxySecret []byte) (*NonceRequest, error) {
-	nonce := make([]byte, 16)
-	keySelector := make([]byte, 4)
-	cryptoTS := make([]byte, 4)
+	nonce := make([]byte, 16)      //nolint: gomnd
+	keySelector := make([]byte, 4) //nolint: gomnd
+	cryptoTS := make([]byte, 4)    //nolint: gomnd

 	if _, err := rand.Read(nonce); err != nil {
 		return nil, fmt.Errorf("cannot generate nonce: %w", err)
 	}

 	copy(keySelector, proxySecret)
-
-	timestamp := time.Now().Truncate(time.Second).Unix() % 4294967296 // 256 ^ 4 - do not know how to name
+	// 256 ^ 4 - do not know how to name
+	timestamp := time.Now().Truncate(time.Second).Unix() % 4294967296 //nolint: gomnd
 	binary.LittleEndian.PutUint32(cryptoTS, uint32(timestamp))

 	return &NonceRequest{
@@ -15,13 +15,13 @@ type NonceResponse struct {

 // Bytes returns serialized form of the nonce response.
 func (r *NonceResponse) Bytes() []byte {
-	buf := &bytes.Buffer{}
+	buf := bytes.Buffer{}

-	buf.Write(r.Type)        // nolint: gosec
-	buf.Write(r.KeySelector) // nolint: gosec
-	buf.Write(r.Crypto)      // nolint: gosec
-	buf.Write(r.CryptoTS)    // nolint: gosec
-	buf.Write(r.Nonce)       // nolint: gosec
+	buf.Write(r.Type)
+	buf.Write(r.KeySelector)
+	buf.Write(r.Crypto)
+	buf.Write(r.CryptoTS)
+	buf.Write(r.Nonce)

 	return buf.Bytes()
 }
@@ -44,7 +44,7 @@ func (r *NonceResponse) Valid(req *NonceRequest) error {

 // NewNonceResponse build new nonce response based on the given data.
 func NewNonceResponse(data []byte) (*NonceResponse, error) {
-	if len(data) != 32 {
+	if len(data) != 32 { //nolint: gomnd
 		return nil, fmt.Errorf("unexpected message length %d", len(data))
 	}

@@ -21,14 +21,14 @@ const (
 var ProxyRequestFlagsEncryptedPrefix [8]byte

 func (r ProxyRequestFlags) Bytes() []byte {
-	converted := make([]byte, 4)
+	converted := make([]byte, 4) //nolint: gomnd
 	binary.LittleEndian.PutUint32(converted, uint32(r))

 	return converted
 }

 func (r ProxyRequestFlags) String() string {
-	flags := make([]string, 0, 7)
+	flags := make([]string, 0, 7) //nolint: gomnd

 	if r&ProxyRequestFlagsHasAdTag != 0 {
 		flags = append(flags, "HAS_AD_TAG")
@@ -24,7 +24,7 @@ type ProxyResponse struct {
 func ParseProxyResponse(packet conntypes.Packet) (*ProxyResponse, error) {
 	var response ProxyResponse

-	if len(packet) < 4 {
+	if len(packet) < 4 { //nolint: gomnd
 		return nil, fmt.Errorf("incorrect packet length: %d", len(packet))
 	}

@@ -5,17 +5,16 @@ import (
 	"math/rand"
 	"time"

+	"github.com/9seconds/mtg/config"
 	"github.com/beevik/ntp"
 	"go.uber.org/zap"
-
-	"github.com/9seconds/mtg/config"
 )

 const autoUpdatePeriod = time.Minute

 // Fetch fetches the data on time drift.
 func Fetch() (time.Duration, error) {
-	url := config.C.NTPServers[rand.Intn(len(config.C.NTPServers))]
+	url := config.C.NTPServers[rand.Intn(len(config.C.NTPServers))] //nolint: gosec

 	resp, err := ntp.Query(url)
 	if err != nil {
@@ -40,6 +39,7 @@ func AutoUpdate() {
 		diff, err := Fetch()
 		if err != nil {
 			logger.Debugw("Cannot fetch time from NTP", "error", err)
+
 			continue
 		}

@@ -45,14 +45,14 @@ func (c *ClientProtocol) Handshake(socket conntypes.StreamReadWriteCloser) (conn
 	}

 	decHasher := sha256.New()
-	decHasher.Write(fm.Key())        // nolint: errcheck
-	decHasher.Write(config.C.Secret) // nolint: errcheck
+	decHasher.Write(fm.Key())
+	decHasher.Write(config.C.Secret)
 	decryptor := utils.MakeStreamCipher(decHasher.Sum(nil), fm.IV())

 	invertedFrame := fm.Invert()
 	encHasher := sha256.New()
-	encHasher.Write(invertedFrame.Key()) // nolint: errcheck
-	encHasher.Write(config.C.Secret)     // nolint: errcheck
+	encHasher.Write(invertedFrame.Key())
+	encHasher.Write(config.C.Secret)
 	encryptor := utils.MakeStreamCipher(encHasher.Sum(nil), invertedFrame.IV())

 	decryptedFrame := Frame{}
@@ -84,6 +84,7 @@ func (c *ClientProtocol) Handshake(socket conntypes.StreamReadWriteCloser) (conn
 	replayKey := decryptedFrame.Unique()
 	if antireplay.Cache.HasObfuscated2(replayKey) {
 		stats.Stats.ReplayDetected()
+
 		return nil, errors.New("replay attack is detected")
 	}

@@ -92,12 +93,14 @@ func (c *ClientProtocol) Handshake(socket conntypes.StreamReadWriteCloser) (conn
 	return stream.NewObfuscated2(socket, encryptor, decryptor), nil
 }

-func (c *ClientProtocol) ReadFrame(socket conntypes.StreamReader) (fm Frame, err error) {
-	if _, err = io.ReadFull(handshakeReader{socket}, fm.Bytes()); err != nil {
-		err = fmt.Errorf("cannot extract obfuscated2 frame: %w", err)
+func (c *ClientProtocol) ReadFrame(socket conntypes.StreamReader) (Frame, error) {
+	fm := Frame{}
+
+	if _, err := io.ReadFull(handshakeReader{socket}, fm.Bytes()); err != nil {
+		return fm, fmt.Errorf("cannot extract obfuscated2 frame: %w", err)
 	}

-	return
+	return fm, nil
 }

 type handshakeReader struct {
@@ -105,7 +108,7 @@ type handshakeReader struct {
 }

 func (h handshakeReader) Read(p []byte) (int, error) {
-	return h.parent.ReadTimeout(p, clientProtocolHandshakeTimeout)
+	return h.parent.ReadTimeout(p, clientProtocolHandshakeTimeout) //nolint: wrapcheck
 }

 func MakeClientProtocol() protocol.ClientProtocol {
@@ -15,7 +15,7 @@ const (
 	frameLen = 64
 )

-// [frameOffsetFirst:frameOffsetKey:frameOffsetIV:frameOffsetMagic:frameOffsetDC:frameOffsetEnd]
+// [frameOffsetFirst:frameOffsetKey:frameOffsetIV:frameOffsetMagic:frameOffsetDC:frameOffsetEnd].
 type Frame struct {
 	data [frameLen]byte
 }
@@ -44,11 +44,11 @@ func (f *Frame) Unique() []byte {
 	return f.data[frameOffsetFirst:frameOffsetDC]
 }

-func (f *Frame) Invert() (nf Frame) {
-	nf = *f
+func (f *Frame) Invert() Frame {
+	nf := *f
 	for i := 0; i < frameLenKey+frameLenIV; i++ {
 		nf.data[frameOffsetFirst+i] = f.data[frameOffsetIV-1-i]
 	}

-	return
+	return nf
 }
@@ -39,7 +39,8 @@ func TelegramProtocol(req *protocol.TelegramRequest) (conntypes.StreamReadWriteC
 	return stream.NewObfuscated2(conn, encryptor, decryptor), nil
 }

-func generateFrame(cp protocol.ClientProtocol) (fm Frame) {
+func generateFrame(cp protocol.ClientProtocol) Frame {
+	fm := Frame{}
 	data := fm.Bytes()

 	for {
@@ -47,22 +48,22 @@ func generateFrame(cp protocol.ClientProtocol) (fm Frame) {
 			continue
 		}

-		if data[0] == 0xef {
+		if data[0] == 0xef { //nolint: gomnd
 			continue
 		}

-		val := (uint32(data[3]) << 24) | (uint32(data[2]) << 16) | (uint32(data[1]) << 8) | uint32(data[0])
-		if val == 0x44414548 || val == 0x54534f50 || val == 0x20544547 || val == 0x4954504f || val == 0xeeeeeeee {
+		val := (uint32(data[3]) << 24) | (uint32(data[2]) << 16) | (uint32(data[1]) << 8) | uint32(data[0])        //nolint: gomnd, lll
+		if val == 0x44414548 || val == 0x54534f50 || val == 0x20544547 || val == 0x4954504f || val == 0xeeeeeeee { //nolint: lll
 			continue
 		}

-		val = (uint32(data[7]) << 24) | (uint32(data[6]) << 16) | (uint32(data[5]) << 8) | uint32(data[4])
-		if val == 0x00000000 {
+		val = (uint32(data[7]) << 24) | (uint32(data[6]) << 16) | (uint32(data[5]) << 8) | uint32(data[4]) //nolint: gomnd
+		if val == 0x00000000 {                                                                             //nolint: gomnd
 			continue
 		}

 		copy(fm.Magic(), cp.ConnectionType().Tag())

-		return
+		return fm
 	}
 }
@@ -3,9 +3,8 @@ package protocol
 import (
 	"context"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 type TelegramRequest struct {
@@ -4,11 +4,9 @@ import (
 	"io"
 	"sync"

-	"go.uber.org/zap"
-
-	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/obfuscated2"
 	"github.com/9seconds/mtg/protocol"
+	"go.uber.org/zap"
 )

 const directPipeBufferSize = 1024
@@ -16,19 +14,17 @@ const directPipeBufferSize = 1024
 func directConnection(request *protocol.TelegramRequest) error {
 	telegramConnRaw, err := obfuscated2.TelegramProtocol(request)
 	if err != nil {
-		return err
+		return err //nolint: wrapcheck
 	}

-	telegramConn := telegramConnRaw.(conntypes.StreamReadWriteCloser)
-
-	defer telegramConn.Close()
+	defer telegramConnRaw.Close()

 	wg := &sync.WaitGroup{}
-	wg.Add(2)
+	wg.Add(2) //nolint: gomnd

-	go directPipe(telegramConn, request.ClientConn, wg, request.Logger)
+	go directPipe(telegramConnRaw, request.ClientConn, wg, request.Logger)

-	go directPipe(request.ClientConn, telegramConn, wg, request.Logger)
+	go directPipe(request.ClientConn, telegramConnRaw, wg, request.Logger)

 	wg.Wait()

@@ -3,17 +3,17 @@ package proxy
 import (
 	"sync"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/protocol"
 	"github.com/9seconds/mtg/wrappers/packetack"
+	"go.uber.org/zap"
 )

 func middleConnection(request *protocol.TelegramRequest) {
 	telegramConn, err := packetack.NewProxy(request)
 	if err != nil {
 		request.Logger.Debugw("Cannot dial to Telegram", "error", err)
+
 		return
 	}
 	defer telegramConn.Close()
@@ -27,12 +27,12 @@ func middleConnection(request *protocol.TelegramRequest) {
 		clientConn = packetack.NewClientIntermediate(request.ClientConn)
 	case conntypes.ConnectionTypeSecure:
 		clientConn = packetack.NewClientIntermediateSecure(request.ClientConn)
-	default:
+	case conntypes.ConnectionTypeUnknown:
 		panic("unknown connection type")
 	}

 	wg := &sync.WaitGroup{}
-	wg.Add(2)
+	wg.Add(2) //nolint: gomnd

 	go middlePipe(telegramConn, clientConn, wg, request.Logger)

@@ -44,7 +44,8 @@ func middleConnection(request *protocol.TelegramRequest) {
 func middlePipe(dst conntypes.PacketAckWriteCloser,
 	src conntypes.PacketAckReadCloser,
 	wg *sync.WaitGroup,
-	logger *zap.SugaredLogger) {
+	logger *zap.SugaredLogger,
+) {
 	defer func() {
 		dst.Close()
 		src.Close()
@@ -53,15 +54,17 @@ func middlePipe(dst conntypes.PacketAckWriteCloser,

 	for {
 		acks := conntypes.ConnectionAcks{}
-		packet, err := src.Read(&acks)

+		packet, err := src.Read(&acks)
 		if err != nil {
 			logger.Debugw("Cannot read packet", "error", err)
+
 			return
 		}

 		if err = dst.Write(packet, &acks); err != nil {
 			logger.Debugw("Cannot send packet", "error", err)
+
 			return
 		}
 	}
@@ -4,14 +4,13 @@ import (
 	"context"
 	"net"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/config"
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/protocol"
 	"github.com/9seconds/mtg/stats"
 	"github.com/9seconds/mtg/utils"
 	"github.com/9seconds/mtg/wrappers/stream"
+	"go.uber.org/zap"
 )

 type Proxy struct {
@@ -53,6 +52,7 @@ func (p *Proxy) accept(conn net.Conn) {

 	if err := utils.InitTCP(conn, config.C.ClientReadBuffer(), config.C.ClientWriteBuffer()); err != nil {
 		logger.Errorw("Cannot initialize client TCP connection", "error", err)
+
 		return
 	}

@@ -66,8 +66,8 @@ func (p *Proxy) accept(conn net.Conn) {
 	defer clientConn.Close()

 	clientProtocol := p.ClientProtocolMaker()
-	clientConn, err := clientProtocol.Handshake(clientConn)

+	clientConn, err := clientProtocol.Handshake(clientConn)
 	if err != nil {
 		stats.Stats.AuthenticationFailed()
 		logger.Warnw("Cannot perform client handshake", "error", err)
@@ -28,11 +28,11 @@ func Init(ctx context.Context) error {
 		Handler: mux,
 	}

-	go srv.Serve(listener) // nolint: errcheck
+	go srv.Serve(listener) //nolint: errcheck

 	go func() {
 		<-ctx.Done()
-		srv.Shutdown(context.Background()) // nolint: errcheck
+		srv.Shutdown(context.Background()) //nolint: errcheck
 	}()

 	Stats = multiStats(stats)
@@ -5,11 +5,10 @@ import (
 	"net/http"
 	"strconv"

-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-
 	"github.com/9seconds/mtg/config"
 	"github.com/9seconds/mtg/conntypes"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )

 type statsPrometheus struct {
@@ -40,7 +39,8 @@ func (s *statsPrometheus) ClientDisconnected(connectionType conntypes.Connection

 func (s *statsPrometheus) changeConnections(connectionType conntypes.ConnectionType,
 	addr *net.TCPAddr,
-	increment float64) {
+	increment float64,
+) {
 	labels := [...]string{
 		"intermediate",
 		"ipv4",
@@ -51,10 +51,14 @@ func (s *statsPrometheus) changeConnections(connectionType conntypes.ConnectionT
 		labels[0] = "abridged"
 	case conntypes.ConnectionTypeSecure:
 		labels[0] = "secured"
+	case conntypes.ConnectionTypeIntermediate:
+		labels[0] = "intermediate"
+	case conntypes.ConnectionTypeUnknown:
+		panic("unknown connection type")
 	}

 	if addr.IP.To4() == nil {
-		labels[1] = "ipv6" // nolint: goconst
+		labels[1] = "ipv6"
 	}

 	s.connections.WithLabelValues(labels[:]...).Add(increment)
@@ -8,11 +8,10 @@ import (
 	"sync"
 	"time"

-	statsd "github.com/smira/go-statsd"
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/config"
 	"github.com/9seconds/mtg/conntypes"
+	statsd "github.com/smira/go-statsd"
+	"go.uber.org/zap"
 )

 var (
@@ -84,15 +83,17 @@ func (s *statsStatsd) ClientDisconnected(connectionType conntypes.ConnectionType
 }

 func (s *statsStatsd) changeConnections(connectionType conntypes.ConnectionType, addr *net.TCPAddr, increment int64) {
-	tags := make([]*statsStatsdTag, 0, 2)
+	tags := make([]*statsStatsdTag, 0, 2) //nolint: gomnd

 	switch connectionType {
 	case conntypes.ConnectionTypeAbridged:
 		tags = append(tags, tagConnectionTypeAbridged)
 	case conntypes.ConnectionTypeIntermediate:
 		tags = append(tags, tagConnectionTypeIntermediate)
-	default:
+	case conntypes.ConnectionTypeSecure:
 		tags = append(tags, tagConnectionTypeSecured)
+	case conntypes.ConnectionTypeUnknown:
+		panic("Unknown connection type")
 	}

 	if addr.IP.To4() == nil {
@@ -167,17 +168,18 @@ func (s *statsStatsd) prepareVals(metric string, tags []*statsStatsdTag) (string

 func (s *statsStatsd) initGauge(metric, key string, tags []statsd.Tag) {
 	s.seenMutex.RLock()
-	_, ok := s.seen[key]
-	s.seenMutex.RUnlock()
+	if _, ok := s.seen[key]; ok {
+		s.seenMutex.RUnlock()

-	if ok {
 		return
+	} else { //nolint: golint,revive
+		s.seenMutex.RUnlock()
 	}

 	s.seenMutex.Lock()
 	defer s.seenMutex.Unlock()

-	if _, ok = s.seen[key]; !ok {
+	if _, ok := s.seen[key]; !ok {
 		s.seen[key] = struct{}{}
 		s.client.Gauge(metric, 0, tags...)
 	}
@@ -192,8 +194,8 @@ func newStatsStatsd() Interface {
 	return &statsStatsd{
 		seen: make(map[string]struct{}),
 		client: statsd.NewClient(config.C.StatsdAddr.String(),
-			statsd.SendLoopCount(2),
-			statsd.ReconnectInterval(10*time.Second),
+			statsd.SendLoopCount(2),                  //nolint: gomnd
+			statsd.ReconnectInterval(10*time.Second), //nolint: gomnd
 			statsd.Logger(logger),
 			statsd.MetricPrefix(prefix),
 			statsd.TagStyle(config.C.StatsdTagsFormat),
@@ -12,8 +12,8 @@ import (
 )

 const (
-	addressesURLV4 = "https://core.telegram.org/getProxyConfig"   // nolint: gas
-	addressesURLV6 = "https://core.telegram.org/getProxyConfigV6" // nolint: gas
+	addressesURLV4 = "https://core.telegram.org/getProxyConfig"   //nolint: gas
+	addressesURLV6 = "https://core.telegram.org/getProxyConfigV6" //nolint: gas
 )

 var addressesProxyForSplitter = regexp.MustCompile(`\s+`)
@@ -74,12 +74,12 @@ func getAddresses(url string) (map[conntypes.DC][]string, conntypes.DC, error) {
 }

 func addressesParseProxyFor(text string) (string, conntypes.DC, error) {
-	chunks := addressesProxyForSplitter.Split(text, 3)
+	chunks := addressesProxyForSplitter.Split(text, 3) //nolint: gomnd
 	if len(chunks) != 3 || chunks[0] != "proxy_for" {
 		return "", 0, fmt.Errorf("incorrect config %s", text)
 	}

-	dc, err := strconv.ParseInt(chunks[1], 10, 16)
+	dc, err := strconv.ParseInt(chunks[1], 10, 16) //nolint: gomnd
 	if err != nil {
 		return "", 0, fmt.Errorf("incorrect config '%s': %w", text, err)
 	}
@@ -93,14 +93,14 @@ func addressesParseProxyFor(text string) (string, conntypes.DC, error) {
 }

 func addressesParseDefault(text string) (conntypes.DC, error) {
-	chunks := addressesProxyForSplitter.Split(text, 2)
+	chunks := addressesProxyForSplitter.Split(text, 2) //nolint: gomnd
 	if len(chunks) != 2 || chunks[0] != "default" {
 		return 0, fmt.Errorf("incorrect config '%s'", text)
 	}

 	dcString := strings.TrimRight(chunks[1], ";")

-	dc, err := strconv.ParseInt(dcString, 10, 16)
+	dc, err := strconv.ParseInt(dcString, 10, 16) //nolint: gomnd
 	if err != nil {
 		return 0, fmt.Errorf("incorrect config '%s': %w", text, err)
 	}
@@ -1,9 +1,9 @@
 package api

 import (
+	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"time"
 )
@@ -18,7 +18,10 @@ var httpClient = http.Client{
 }

 func request(url string) (io.ReadCloser, error) {
-	req, err := http.NewRequest("GET", url, nil)
+	ctx, cancel := context.WithTimeout(context.Background(), apiHTTPTimeout)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
 	if err != nil {
 		panic(err)
 	}
@@ -29,12 +32,12 @@ func request(url string) (io.ReadCloser, error) {
 	resp, err := httpClient.Do(req)
 	if err != nil {
 		if resp != nil {
-			io.Copy(ioutil.Discard, resp.Body) // nolint: errcheck
+			io.Copy(io.Discard, resp.Body) //nolint: errcheck
 			resp.Body.Close()
 		}

 		return nil, fmt.Errorf("cannot perform a request: %w", err)
 	}

-	return resp.Body, err
+	return resp.Body, err //nolint: wrapcheck
 }
@@ -2,10 +2,10 @@ package api

 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 )

-const secretURL = "https://core.telegram.org/getProxySecret" // nolint: gas
+const secretURL = "https://core.telegram.org/getProxySecret" //nolint: gas

 func Secret() ([]byte, error) {
 	resp, err := request(secretURL)
@@ -15,7 +15,7 @@ func Secret() ([]byte, error) {

 	defer resp.Close()

-	secret, err := ioutil.ReadAll(resp)
+	secret, err := io.ReadAll(resp)
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response: %w", err)
 	}
@@ -5,12 +5,11 @@ import (
 	"math/rand"
 	"net"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/config"
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/utils"
 	"github.com/9seconds/mtg/wrappers/stream"
+	"go.uber.org/zap"
 )

 type baseTelegram struct {
@@ -29,16 +28,19 @@ func (b *baseTelegram) Secret() []byte {
 }

 func (b *baseTelegram) dial(dc conntypes.DC,
-	protocol conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error) {
+	protocol conntypes.ConnectionProtocol,
+) (conntypes.StreamReadWriteCloser, error) {
 	for _, addr := range b.getAddresses(dc, protocol) {
 		conn, err := b.dialer.Dial("tcp", addr)
 		if err != nil {
 			b.logger.Infow("Cannot dial to Telegram", "address", addr, "error", err)
+
 			continue
 		}

 		if err := utils.InitTCP(conn, config.C.ProxyReadBuffer(), config.C.ProxyWriteBuffer()); err != nil {
 			b.logger.Infow("Cannot initialize TCP socket", "address", addr, "error", err)
+
 			continue
 		}

@@ -49,7 +51,7 @@ func (b *baseTelegram) dial(dc conntypes.DC,
 }

 func (b *baseTelegram) getAddresses(dc conntypes.DC, protocol conntypes.ConnectionProtocol) []string {
-	addresses := make([]string, 0, 2)
+	addresses := make([]string, 0, 2) //nolint: gomnd
 	protos := []conntypes.ConnectionProtocol{
 		conntypes.ConnectionProtocolIPv6,
 		conntypes.ConnectionProtocolIPv4,
@@ -73,7 +75,8 @@ func (b *baseTelegram) getAddresses(dc conntypes.DC, protocol conntypes.Connecti
 }

 func (b *baseTelegram) chooseAddress(addresses map[conntypes.DC][]string,
-	dc, defaultDC conntypes.DC) string {
+	dc, defaultDC conntypes.DC,
+) string {
 	addrs, ok := addresses[dc]
 	if !ok {
 		addrs = addresses[defaultDC]
@@ -83,7 +86,7 @@ func (b *baseTelegram) chooseAddress(addresses map[conntypes.DC][]string,
 	case len(addrs) == 1:
 		return addrs[0]
 	case len(addrs) > 1:
-		return addrs[rand.Intn(len(addrs))]
+		return addrs[rand.Intn(len(addrs))] //nolint: gosec
 	}

 	return ""
@@ -29,7 +29,8 @@ type directTelegram struct {
 }

 func (d *directTelegram) Dial(dc conntypes.DC,
-	protocol conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error) {
+	protocol conntypes.ConnectionProtocol,
+) (conntypes.StreamReadWriteCloser, error) {
 	switch {
 	case dc < 0:
 		dc = -dc
@@ -5,10 +5,9 @@ import (
 	"sync"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/telegram/api"
+	"go.uber.org/zap"
 )

 const middleTelegramBackgroundUpdateEvery = time.Hour
@@ -64,7 +63,8 @@ func (m *middleTelegram) backgroundUpdate() {
 }

 func (m *middleTelegram) Dial(dc conntypes.DC,
-	protocol conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error) {
+	protocol conntypes.ConnectionProtocol,
+) (conntypes.StreamReadWriteCloser, error) {
 	if dc == 0 {
 		dc = conntypes.DCDefaultIdx
 	}
@@ -20,20 +20,22 @@ const (
 type CipherSuiteType uint8

 const (
-	CipherSuiteType_TLS_AES_128_GCM_SHA256       CipherSuiteType = iota // nolint: stylecheck, golint
-	CipherSuiteType_TLS_AES_256_GCM_SHA384                              // nolint: stylecheck, golint
-	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256                        // nolint: stylecheck, golint
+	CipherSuiteType_TLS_AES_128_GCM_SHA256       CipherSuiteType = iota //nolint: stylecheck,golint,revive,nosnakecase
+	CipherSuiteType_TLS_AES_256_GCM_SHA384                              //nolint: stylecheck,golint,revive,nosnakecase
+	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256                        //nolint: stylecheck,golint,revive,nosnakecase
 )

 func (c CipherSuiteType) Bytes() []byte {
 	switch c {
-	case CipherSuiteType_TLS_AES_128_GCM_SHA256:
-		return CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes
-	case CipherSuiteType_TLS_AES_256_GCM_SHA384:
-		return CipherSuiteType_TLS_AES_256_GCM_SHA384_Bytes
+	case CipherSuiteType_TLS_AES_128_GCM_SHA256: //nolint: nosnakecase
+		return CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes //nolint: nosnakecase
+	case CipherSuiteType_TLS_AES_256_GCM_SHA384: //nolint: nosnakecase
+		return CipherSuiteType_TLS_AES_256_GCM_SHA384_Bytes //nolint: nosnakecase
+	case CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256: //nolint: nosnakecase
+		return CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes //nolint: nosnakecase
 	}

-	return CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes
+	return CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes //nolint: nosnakecase
 }

 type Version uint8
@@ -46,6 +48,8 @@ func (v Version) Bytes() []byte {
 		return Version12Bytes
 	case Version11:
 		return Version11Bytes
+	case Version10, VersionUnknown:
+		return Version10Bytes
 	}

 	return Version10Bytes
@@ -65,9 +69,9 @@ var (
 	Version12Bytes = []byte{0x03, 0x03}
 	Version13Bytes = []byte{0x03, 0x04}

-	CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes       = []byte{0x13, 0x01} // nolint: stylecheck, golint
-	CipherSuiteType_TLS_AES_256_GCM_SHA384_Bytes       = []byte{0x13, 0x02} // nolint: stylecheck, golint
-	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes = []byte{0x13, 0x03} // nolint; stylecheck, golint
+	CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes       = []byte{0x13, 0x01} //nolint: stylecheck,golint,revive,nosnakecase
+	CipherSuiteType_TLS_AES_256_GCM_SHA384_Bytes       = []byte{0x13, 0x02} //nolint: stylecheck,golint,revive,nosnakecase
+	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes = []byte{0x13, 0x03} //nolint: stylecheck,golint,revive,nosnakecase
 )

 type Byter interface {
@@ -78,7 +82,7 @@ type Byter interface {
 type RawBytes []byte

 func (r RawBytes) WriteBytes(writer io.Writer) {
-	writer.Write(r) // nolint: errcheck
+	writer.Write(r) //nolint: errcheck
 }

 func (r RawBytes) Len() int {
@@ -1,6 +1,7 @@
 package tlstypes

 import (
+	"bytes"
 	"io"

 	"github.com/9seconds/mtg/utils"
@@ -15,30 +16,28 @@ type Handshake struct {
 }

 func (h *Handshake) WriteBytes(writer io.Writer) {
-	packetBuf := acquireBytesBuffer()
-	defer releaseBytesBuffer(packetBuf)
+	packetBuf := bytes.Buffer{}

-	writer.Write([]byte{byte(h.Type)}) // nolint: errcheck
+	writer.Write([]byte{byte(h.Type)}) //nolint: errcheck

 	packetBuf.Write(h.Version.Bytes())
 	packetBuf.Write(h.Random[:])
 	packetBuf.WriteByte(byte(len(h.SessionID)))
 	packetBuf.Write(h.SessionID)
-	h.Tail.WriteBytes(packetBuf)
+	h.Tail.WriteBytes(&packetBuf)

 	sizeUint24 := utils.ToUint24(uint32(packetBuf.Len()))
 	sizeUint24Bytes := sizeUint24[:]
 	sizeUint24Bytes[0], sizeUint24Bytes[2] = sizeUint24Bytes[2], sizeUint24Bytes[0]

-	writer.Write(sizeUint24Bytes) // nolint: errcheck
-	packetBuf.WriteTo(writer)     // nolint: errcheck
+	writer.Write(sizeUint24Bytes) //nolint: errcheck
+	packetBuf.WriteTo(writer)     //nolint: errcheck
 }

 func (h *Handshake) Len() int {
-	buf := acquireBytesBuffer()
-	defer releaseBytesBuffer(buf)
+	buf := bytes.Buffer{}

-	h.WriteBytes(buf)
+	h.WriteBytes(&buf)

 	return buf.Len()
 }
@@ -1,23 +0,0 @@
-package tlstypes
-
-import (
-	"bytes"
-	"sync"
-)
-
-var (
-	poolBytesBuffer = sync.Pool{
-		New: func() interface{} {
-			return &bytes.Buffer{}
-		},
-	}
-)
-
-func acquireBytesBuffer() *bytes.Buffer {
-	return poolBytesBuffer.Get().(*bytes.Buffer)
-}
-
-func releaseBytesBuffer(buf *bytes.Buffer) {
-	buf.Reset()
-	poolBytesBuffer.Put(buf)
-}
@@ -16,9 +16,9 @@ type Record struct {
 }

 func (r Record) WriteBytes(writer io.Writer) {
-	writer.Write([]byte{byte(r.Type)})                           // nolint: errcheck
-	writer.Write(r.Version.Bytes())                              // nolint: errcheck
-	binary.Write(writer, binary.BigEndian, uint16(r.Data.Len())) // nolint: errcheck
+	writer.Write([]byte{byte(r.Type)})                           //nolint: errcheck
+	writer.Write(r.Version.Bytes())                              //nolint: errcheck
+	binary.Write(writer, binary.BigEndian, uint16(r.Data.Len())) //nolint: errcheck
 	r.Data.WriteBytes(writer)
 }

@@ -65,7 +65,9 @@ func ReadRecord(reader io.Reader) (Record, error) {
 	return rec, nil
 }

-func MakeRecords(raw []byte) (arr []Record) {
+func MakeRecords(raw []byte) []Record {
+	var arr []Record
+
 	for len(raw) > 0 {
 		chunkSize := recordMaxChunkSize
 		if chunkSize > len(raw) {
@@ -80,5 +82,5 @@ func MakeRecords(raw []byte) (arr []Record) {
 		raw = raw[chunkSize:]
 	}

-	return
+	return arr
 }
@@ -8,9 +8,8 @@ import (
 	"io"
 	mrand "math/rand"

-	"golang.org/x/crypto/curve25519"
-
 	"github.com/9seconds/mtg/config"
+	"golang.org/x/crypto/curve25519"
 )

 type ServerHello struct {
@@ -37,8 +36,8 @@ func (s ServerHello) WelcomePacket() []byte {
 	}
 	recChangeCipher.WriteBytes(buf)

-	hostCert := make([]byte, 1024+mrand.Intn(3092))
-	rand.Read(hostCert) // nolint: errcheck
+	hostCert := make([]byte, 1024+mrand.Intn(3092)) //nolint: gosec, gomnd
+	rand.Read(hostCert)                             //nolint: errcheck

 	recData := Record{
 		Type:    RecordTypeApplicationData,
@@ -50,8 +49,8 @@ func (s ServerHello) WelcomePacket() []byte {
 	packet := buf.Bytes()

 	mac := hmac.New(sha256.New, config.C.Secret)
-	mac.Write(s.clientHello.Random[:]) // nolint: errcheck
-	mac.Write(packet)                  // nolint: errcheck
+	mac.Write(s.clientHello.Random[:])
+	mac.Write(packet)
 	copy(packet[11:], mac.Sum(nil))

 	return packet
@@ -67,8 +66,8 @@ func NewServerHello(clientHello *ClientHello) *ServerHello {
 	rv.SessionID = make([]byte, len(clientHello.SessionID))
 	copy(rv.SessionID, clientHello.SessionID)

-	tail := bytes.NewBuffer(CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes)
-	tail.WriteByte(0x00) // no compression
+	tail := bytes.NewBuffer(CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes) //nolint: nosnakecase
+	tail.WriteByte(0x00)                                                  //nolint: gomnd // no compression
 	makeTLSExtensions(tail)
 	rv.Tail = RawBytes(tail.Bytes())

@@ -76,7 +75,7 @@ func NewServerHello(clientHello *ClientHello) *ServerHello {
 }

 func makeTLSExtensions(buf io.Writer) {
-	buf.Write([]byte{ // nolint: errcheck
+	buf.Write([]byte{ //nolint: errcheck
 		0x00, 0x2e, // 46 bytes of data
 		0x00, 0x33, // Extension - Key Share
 		0x00, 0x24, // 36 bytes
@@ -86,11 +85,11 @@ func makeTLSExtensions(buf io.Writer) {

 	var scalar [32]byte

-	rand.Read(scalar[:]) // nolint: errcheck
+	rand.Read(scalar[:]) //nolint: errcheck
 	curve, _ := curve25519.X25519(scalar[:], curve25519.Basepoint)
-	buf.Write(curve) // nolint: errcheck
+	buf.Write(curve) //nolint: errcheck

-	buf.Write([]byte{ // nolint: errcheck
+	buf.Write([]byte{ //nolint: errcheck
 		0x00, 0x2b, // Extension - Supported Versions
 		0x00, 0x02, // 2 bytes are following
 		0x03, 0x04, // TLS 1.3
@@ -3,13 +3,10 @@ package utils
 import (
 	"fmt"
 	"net"
-	"time"
 )

-const tcpKeepAlivePingPeriod = 2 * time.Second
-
-func InitTCP(conn net.Conn, readBufferSize int, writeBufferSize int) error {
-	tcpConn := conn.(*net.TCPConn)
+func InitTCP(conn net.Conn, readBufferSize, writeBufferSize int) error {
+	tcpConn := conn.(*net.TCPConn) //nolint: forcetypeassert

 	if err := tcpConn.SetNoDelay(true); err != nil {
 		return fmt.Errorf("cannot set TCP_NO_DELAY: %w", err)
@@ -27,9 +24,5 @@ func InitTCP(conn net.Conn, readBufferSize int, writeBufferSize int) error {
 		return fmt.Errorf("cannot enable keep-alive: %w", err)
 	}

-	if err := tcpConn.SetKeepAlivePeriod(tcpKeepAlivePingPeriod); err != nil {
-		return fmt.Errorf("cannot set keep-alive period: %w", err)
-	}
-
 	return nil
 }
@@ -4,14 +4,15 @@ import "io"

 const readFullBufferSize = 1024 + 1 // +1 because telegram opreates with blocks mod 4

-func ReadFull(src io.Reader) (rv []byte, err error) {
+func ReadFull(src io.Reader) ([]byte, error) {
 	buf := make([]byte, readFullBufferSize)
 	n := readFullBufferSize
+	rv := []byte{}

 	for n == len(buf) {
-		n, err = src.Read(buf)
+		n, err := src.Read(buf)
 		if err != nil {
-			return nil, err
+			return nil, err //nolint: wrapcheck
 		}

 		rv = append(rv, buf[:n]...)
@@ -6,7 +6,7 @@ func ReverseBytes(data []byte) []byte {
 	rv := make([]byte, dataLen)
 	rv[dataLen/2] = data[dataLen/2]

-	for i := dataLen/2 - 1; i >= 0; i-- {
+	for i := dataLen/2 - 1; i >= 0; i-- { //nolint: gomnd
 		opp := dataLen - i - 1
 		rv[i], rv[opp] = data[opp], data[i]
 	}
@@ -1,24 +0,0 @@
-// +build !windows
-
-package utils
-
-import (
-	"fmt"
-
-	"golang.org/x/sys/unix"
-)
-
-func SetLimits() error {
-	rLimit := unix.Rlimit{}
-	if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rLimit); err != nil {
-		return fmt.Errorf("cannot get rlimit: %w", err)
-	}
-
-	rLimit.Cur = rLimit.Max
-
-	if err := unix.Setrlimit(unix.RLIMIT_NOFILE, &rLimit); err != nil {
-		return fmt.Errorf("cannot set rlimit: %w", err)
-	}
-
-	return nil
-}
@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows

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

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

 package utils
@@ -6,6 +6,7 @@ import (
 )

 func MakeStreamCipher(key, iv []byte) cipher.Stream {
-	block, _ := aes.NewCipher(key) // nolint: gosec
+	block, _ := aes.NewCipher(key)
+
 	return cipher.NewCTR(block, iv)
 }
@@ -3,9 +3,9 @@ package utils
 type Uint24 [3]byte

 func ToUint24(number uint32) Uint24 {
-	return Uint24{byte(number), byte(number >> 8), byte(number >> 16)}
+	return Uint24{byte(number), byte(number >> 8), byte(number >> 16)} //nolint: gomnd
 }

 func FromUint24(number Uint24) uint32 {
-	return uint32(number[0]) + (uint32(number[1]) << 8) + (uint32(number[2]) << 16)
+	return uint32(number[0]) + (uint32(number[1]) << 8) + (uint32(number[2]) << 16) //nolint: gomnd
 }
@@ -7,12 +7,10 @@ import (
 	"fmt"
 	"hash/crc32"
 	"io"
-	"io/ioutil"
 	"net"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 const (
@@ -29,11 +27,14 @@ var mtprotoFramePadding = []byte{0x04, 0x00, 0x00, 0x00}
 //
 // MSGLEN is the length of the message + len of seqno and msglen.
 // SEQNO is the number of frame in the receive/send sequence. If client
-//   sends a message with SeqNo 18, it has to receive message with SeqNo 18.
+//
+//	sends a message with SeqNo 18, it has to receive message with SeqNo 18.
+//
 // MSG is the data which has to be written
 // CRC32 is the CRC32 checksum of MSGLEN + SEQNO + MSG
 // PADDING is custom padding schema to complete frame length to such that
-//    len(frame) % 16 == 0
+//
+//	len(frame) % 16 == 0
 type wrapperMtprotoFrame struct {
 	parent     conntypes.StreamReadWriteCloser
 	logger     *zap.SugaredLogger
@@ -41,9 +42,8 @@ type wrapperMtprotoFrame struct {
 	writeSeqNo int32
 }

-func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funlen
-	buf := acquireMtprotoFrameBytesBuffer()
-	defer releaseMtprotoFrameBytesBuffer(buf)
+func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { //nolint: funlen, cyclop
+	buf := &bytes.Buffer{}

 	sum := crc32.NewIEEE()
 	writer := io.MultiWriter(buf, sum)
@@ -52,7 +52,7 @@ func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funl
 		buf.Reset()
 		sum.Reset()

-		if _, err := io.CopyN(writer, w.parent, 4); err != nil {
+		if _, err := io.CopyN(writer, w.parent, 4); err != nil { //nolint: gomnd
 			return nil, fmt.Errorf("cannot read frame padding: %w", err)
 		}

@@ -74,23 +74,23 @@ func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funl

 	buf.Reset()

-	if _, err := io.CopyN(writer, w.parent, int64(messageLength)-4-4); err != nil {
+	if _, err := io.CopyN(writer, w.parent, int64(messageLength)-4-4); err != nil { //nolint: gomnd
 		return nil, fmt.Errorf("cannot read the message frame: %w", err)
 	}

 	var seqNo int32

-	binary.Read(buf, binary.LittleEndian, &seqNo) // nolint: errcheck
+	binary.Read(buf, binary.LittleEndian, &seqNo) //nolint: errcheck

 	if seqNo != w.readSeqNo {
 		return nil, fmt.Errorf("unexpected sequence number %d (wait for %d)", seqNo, w.readSeqNo)
 	}

-	data, _ := ioutil.ReadAll(buf) // nolint: gosec
+	data, _ := io.ReadAll(buf)
 	buf.Reset()
 	// write to buf, not to writer. This is because we are going to fetch
 	// crc32 checksum.
-	if _, err := io.CopyN(buf, w.parent, 4); err != nil {
+	if _, err := io.CopyN(buf, w.parent, 4); err != nil { //nolint: gomnd
 		return nil, fmt.Errorf("cannot read checksum: %w", err)
 	}

@@ -111,19 +111,18 @@ func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funl
 }

 func (w *wrapperMtprotoFrame) Write(p conntypes.Packet) error {
-	messageLength := 4 + 4 + len(p) + 4
+	messageLength := 4 + 4 + len(p) + 4 //nolint: gomnd
 	paddingLength := (aes.BlockSize - messageLength%aes.BlockSize) % aes.BlockSize

-	buf := acquireMtprotoFrameBytesBuffer()
-	defer releaseMtprotoFrameBytesBuffer(buf)
+	buf := &bytes.Buffer{}

-	binary.Write(buf, binary.LittleEndian, uint32(messageLength)) // nolint: errcheck
-	binary.Write(buf, binary.LittleEndian, w.writeSeqNo)          // nolint: errcheck
+	binary.Write(buf, binary.LittleEndian, uint32(messageLength)) //nolint: errcheck
+	binary.Write(buf, binary.LittleEndian, w.writeSeqNo)          //nolint: errcheck
 	buf.Write(p)

 	checksum := crc32.ChecksumIEEE(buf.Bytes())
-	binary.Write(buf, binary.LittleEndian, checksum) // nolint: errcheck
-	buf.Write(bytes.Repeat(mtprotoFramePadding, paddingLength/4))
+	binary.Write(buf, binary.LittleEndian, checksum)              //nolint: errcheck
+	buf.Write(bytes.Repeat(mtprotoFramePadding, paddingLength/4)) //nolint: gomnd

 	w.logger.Debugw("Write MTProto frame",
 		"length", len(p),
@@ -135,11 +134,11 @@ func (w *wrapperMtprotoFrame) Write(p conntypes.Packet) error {

 	_, err := w.parent.Write(buf.Bytes())

-	return err
+	return err //nolint: wrapcheck
 }

 func (w *wrapperMtprotoFrame) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func (w *wrapperMtprotoFrame) Conn() net.Conn {
@@ -1,23 +0,0 @@
-package packet
-
-import (
-	"bytes"
-	"sync"
-)
-
-var (
-	poolMtprotoFrameBytesBuffer = sync.Pool{
-		New: func() interface{} {
-			return &bytes.Buffer{}
-		},
-	}
-)
-
-func acquireMtprotoFrameBytesBuffer() *bytes.Buffer {
-	return poolMtprotoFrameBytesBuffer.Get().(*bytes.Buffer)
-}
-
-func releaseMtprotoFrameBytesBuffer(buf *bytes.Buffer) {
-	buf.Reset()
-	poolMtprotoFrameBytesBuffer.Put(buf)
-}
@@ -6,10 +6,9 @@ import (
 	"io"
 	"net"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/utils"
+	"go.uber.org/zap"
 )

 const (
@@ -40,9 +39,9 @@ func (w *wrapperClientAbridged) Read(acks *conntypes.ConnectionAcks) (conntypes.
 	}

 	if msgLength == clientAbridgedSmallPacketLength {
-		buf.Grow(3)
+		buf.Grow(3) //nolint: gomnd

-		if _, err := io.CopyN(&buf, w.parent, 3); err != nil {
+		if _, err := io.CopyN(&buf, w.parent, 3); err != nil { //nolint: gomnd
 			return nil, fmt.Errorf("cannot read correct message length: %w", err)
 		}

@@ -76,7 +75,7 @@ func (w *wrapperClientAbridged) Write(packet conntypes.Packet, acks *conntypes.C
 		return nil
 	}

-	packetLength := len(packet) / 4
+	packetLength := len(packet) / 4 //nolint: gomnd

 	switch {
 	case packetLength < clientAbridgedSmallPacketLength:
@@ -88,9 +87,7 @@ func (w *wrapperClientAbridged) Write(packet conntypes.Packet, acks *conntypes.C
 		return nil
 	case packetLength < clientAbridgedLargePacketLength:
 		length24 := utils.ToUint24(uint32(packetLength))
-
-		buf := acquireClientBytesBuffer()
-		defer releaseClientBytesBuffer(buf)
+		buf := bytes.Buffer{}

 		buf.WriteByte(byte(clientAbridgedSmallPacketLength))
 		buf.Write(length24[:])
@@ -107,7 +104,7 @@ func (w *wrapperClientAbridged) Write(packet conntypes.Packet, acks *conntypes.C
 }

 func (w *wrapperClientAbridged) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func (w *wrapperClientAbridged) Conn() net.Conn {
@@ -7,9 +7,8 @@ import (
 	"io"
 	"net"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 const clientIntermediateQuickAckLength = 0x80000000
@@ -21,9 +20,9 @@ type wrapperClientIntermediate struct {
 func (w *wrapperClientIntermediate) Read(acks *conntypes.ConnectionAcks) (conntypes.Packet, error) {
 	buf := bytes.Buffer{}

-	buf.Grow(4)
+	buf.Grow(4) //nolint: gomnd

-	if _, err := io.CopyN(&buf, w.parent, 4); err != nil {
+	if _, err := io.CopyN(&buf, w.parent, 4); err != nil { //nolint: gomnd
 		return nil, fmt.Errorf("cannot read message length: %w", err)
 	}

@@ -64,7 +63,7 @@ func (w *wrapperClientIntermediate) Write(packet conntypes.Packet, acks *conntyp
 }

 func (w *wrapperClientIntermediate) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func (w *wrapperClientIntermediate) Conn() net.Conn {
@@ -1,13 +1,13 @@
 package packetack

 import (
+	"bytes"
 	"encoding/binary"
 	"fmt"
 	"math/rand"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 type wrapperClientIntermediateSecure struct {
@@ -20,7 +20,7 @@ func (w *wrapperClientIntermediateSecure) Read(acks *conntypes.ConnectionAcks) (
 		return nil, err
 	}

-	length := len(data) - (len(data) % 4)
+	length := len(data) - (len(data) % 4) //nolint: gomnd

 	return data[:length], nil
 }
@@ -34,13 +34,12 @@ func (w *wrapperClientIntermediateSecure) Write(packet conntypes.Packet, acks *c
 		return nil
 	}

-	buf := acquireClientBytesBuffer()
-	defer releaseClientBytesBuffer(buf)
+	buf := &bytes.Buffer{}
+	paddingLength := rand.Intn(4) //nolint: gosec, gomnd

-	paddingLength := rand.Intn(4)
 	buf.Grow(4 + len(packet) + paddingLength)

-	binary.Write(buf, binary.LittleEndian, uint32(len(packet)+paddingLength)) // nolint: errcheck
+	binary.Write(buf, binary.LittleEndian, uint32(len(packet)+paddingLength)) //nolint: errcheck
 	buf.Write(packet)
 	buf.Write(make([]byte, paddingLength))

@@ -1,23 +0,0 @@
-package packetack
-
-import (
-	"bytes"
-	"sync"
-)
-
-var (
-	poolClientBytesBuffer = sync.Pool{
-		New: func() interface{} {
-			return &bytes.Buffer{}
-		},
-	}
-)
-
-func acquireClientBytesBuffer() *bytes.Buffer {
-	return poolClientBytesBuffer.Get().(*bytes.Buffer)
-}
-
-func releaseClientBytesBuffer(buf *bytes.Buffer) {
-	buf.Reset()
-	poolClientBytesBuffer.Put(buf)
-}
@@ -42,11 +42,11 @@ func (w *wrapperProxy) Write(packet conntypes.Packet, acks *conntypes.Connection
 	buf.Write(rpc.ProxyRequestProxyTag)
 	buf.WriteByte(byte(len(config.C.AdTag)))
 	buf.Write(config.C.AdTag)
-	buf.Write(make([]byte, (4-buf.Len()%4)%4))
+	buf.Write(make([]byte, (4-buf.Len()%4)%4)) //nolint: gomnd
 	buf.Grow(len(packet))
 	buf.Write(packet)

-	return w.proxy.Write(buf.Bytes())
+	return w.proxy.Write(buf.Bytes()) //nolint: wrapcheck
 }

 func (w *wrapperProxy) Read(acks *conntypes.ConnectionAcks) (conntypes.Packet, error) {
@@ -64,6 +64,7 @@ func (w *wrapperProxy) Read(acks *conntypes.ConnectionAcks) (conntypes.Packet, e

 func (w *wrapperProxy) Close() error {
 	w.proxy.Close()
+
 	return nil
 }

@@ -77,7 +78,7 @@ func NewProxy(request *protocol.TelegramRequest) (conntypes.PacketAckReadWriteCl
 		flags |= rpc.ProxyRequestFlagsIntermediate
 	case conntypes.ConnectionTypeSecure:
 		flags |= rpc.ProxyRequestFlagsIntermediate | rpc.ProxyRequestFlagsPad
-	default:
+	case conntypes.ConnectionTypeUnknown:
 		panic("unknown connection type")
 	}

@@ -20,7 +20,7 @@ func (w *wrapperPing) Read(p []byte) (int, error) {
 		}
 	}

-	return n, err
+	return n, err //nolint: wrapcheck
 }

 func (w *wrapperPing) Write(p []byte) (int, error) {
@@ -32,11 +32,11 @@ func (w *wrapperPing) Write(p []byte) (int, error) {
 		}
 	}

-	return n, err
+	return n, err //nolint: wrapcheck
 }

 func (w *wrapperPing) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func NewPing(ctx context.Context, parent io.ReadWriteCloser, channelPing chan<- struct{}) io.ReadWriteCloser {
@@ -7,10 +7,9 @@ import (
 	"net"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/utils"
+	"go.uber.org/zap"
 )

 type wrapperBlockCipher struct {
@@ -27,7 +26,7 @@ func (w *wrapperBlockCipher) Write(p []byte) (int, error) {
 		return 0, err
 	}

-	return w.parent.Write(encrypted)
+	return w.parent.Write(encrypted) //nolint: wrapcheck
 }

 func (w *wrapperBlockCipher) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
@@ -36,7 +35,7 @@ func (w *wrapperBlockCipher) WriteTimeout(p []byte, timeout time.Duration) (int,
 		return 0, err
 	}

-	return w.parent.WriteTimeout(encrypted, timeout)
+	return w.parent.WriteTimeout(encrypted, timeout) //nolint: wrapcheck
 }

 func (w *wrapperBlockCipher) encrypt(p []byte) ([]byte, error) {
@@ -51,7 +50,7 @@ func (w *wrapperBlockCipher) encrypt(p []byte) ([]byte, error) {
 }

 func (w *wrapperBlockCipher) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func (w *wrapperBlockCipher) Conn() net.Conn {
@@ -71,7 +70,8 @@ func (w *wrapperBlockCipher) RemoteAddr() *net.TCPAddr {
 }

 func newBlockCipher(parent conntypes.StreamReadWriteCloser,
-	encryptor, decryptor cipher.BlockMode) conntypes.StreamReadWriteCloser {
+	encryptor, decryptor cipher.BlockMode,
+) conntypes.StreamReadWriteCloser {
 	cipher := &wrapperBlockCipher{
 		parent:    parent,
 		encryptor: encryptor,
@@ -33,7 +33,7 @@ func (b *bufferedReader) ReadTimeout(p []byte, _ time.Duration) (int, error) {

 func (b *bufferedReader) flush(p []byte) (int, error) {
 	if b.buf.Len() > len(p) {
-		return b.buf.Read(p)
+		return b.buf.Read(p) //nolint: wrapcheck
 	}

 	sizeToReturn := b.buf.Len()
@@ -5,10 +5,9 @@ import (
 	"net"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/config"
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 type connPurpose uint8
@@ -29,6 +28,7 @@ type wrapperConn struct {
 func (w *wrapperConn) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
 	if err := w.parent.SetWriteDeadline(time.Now().Add(timeout)); err != nil {
 		w.Close()
+
 		return 0, fmt.Errorf("cannot set write deadline to the socket: %w", err)
 	}

@@ -40,15 +40,16 @@ func (w *wrapperConn) Write(p []byte) (int, error) {
 	w.logger.Debugw("write to stream", "bytes", n, "error", err)

 	if err != nil {
-		w.Close() // nolint: gosec
+		w.Close()
 	}

-	return n, err
+	return n, err //nolint: wrapcheck
 }

 func (w *wrapperConn) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
 	if err := w.parent.SetReadDeadline(time.Now().Add(timeout)); err != nil {
 		w.Close()
+
 		return 0, fmt.Errorf("cannot set read deadline to the socket: %w", err)
 	}

@@ -63,12 +64,13 @@ func (w *wrapperConn) Read(p []byte) (int, error) {
 		w.Close()
 	}

-	return n, err
+	return n, err //nolint: wrapcheck
 }

 func (w *wrapperConn) Close() error {
 	w.logger.Debugw("Close connection")
-	return w.parent.Close()
+
+	return w.parent.Close() //nolint: wrapcheck
 }

 func (w *wrapperConn) Conn() net.Conn {
@@ -89,10 +91,11 @@ func (w *wrapperConn) RemoteAddr() *net.TCPAddr {

 func newConn(parent net.Conn,
 	connID conntypes.ConnID,
-	purpose connPurpose) conntypes.StreamReadWriteCloser {
-	localAddr := *parent.LocalAddr().(*net.TCPAddr)
+	purpose connPurpose,
+) conntypes.StreamReadWriteCloser {
+	localAddr := *parent.LocalAddr().(*net.TCPAddr) //nolint: forcetypeassert

-	if parent.RemoteAddr().(*net.TCPAddr).IP.To4() != nil {
+	if parent.RemoteAddr().(*net.TCPAddr).IP.To4() != nil { //nolint: forcetypeassert
 		if config.C.PublicIPv4.IP != nil {
 			localAddr.IP = config.C.PublicIPv4.IP
 		}
@@ -115,7 +118,7 @@ func newConn(parent net.Conn,
 		parent:     parent,
 		connID:     connID,
 		logger:     logger,
-		remoteAddr: parent.RemoteAddr().(*net.TCPAddr),
+		remoteAddr: parent.RemoteAddr().(*net.TCPAddr), //nolint: forcetypeassert
 		localAddr:  &localAddr,
 	}
 }
@@ -6,9 +6,8 @@ import (
 	"net"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 type wrapperCtx struct {
@@ -21,9 +20,10 @@ func (w *wrapperCtx) WriteTimeout(p []byte, timeout time.Duration) (int, error)
 	select {
 	case <-w.ctx.Done():
 		w.Close()
+
 		return 0, fmt.Errorf("cannot write because context was closed: %w", w.ctx.Err())
 	default:
-		return w.parent.WriteTimeout(p, timeout)
+		return w.parent.WriteTimeout(p, timeout) //nolint: wrapcheck
 	}
 }

@@ -31,9 +31,10 @@ func (w *wrapperCtx) Write(p []byte) (int, error) {
 	select {
 	case <-w.ctx.Done():
 		w.Close()
+
 		return 0, fmt.Errorf("cannot write because context was closed: %w", w.ctx.Err())
 	default:
-		return w.parent.Write(p)
+		return w.parent.Write(p) //nolint: wrapcheck
 	}
 }

@@ -41,9 +42,10 @@ func (w *wrapperCtx) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
 	select {
 	case <-w.ctx.Done():
 		w.Close()
+
 		return 0, fmt.Errorf("cannot write because context was closed: %w", w.ctx.Err())
 	default:
-		return w.parent.ReadTimeout(p, timeout)
+		return w.parent.ReadTimeout(p, timeout) //nolint: wrapcheck
 	}
 }

@@ -51,15 +53,17 @@ func (w *wrapperCtx) Read(p []byte) (int, error) {
 	select {
 	case <-w.ctx.Done():
 		w.Close()
+
 		return 0, fmt.Errorf("cannot write because context was closed: %w", w.ctx.Err())
 	default:
-		return w.parent.Read(p)
+		return w.parent.Read(p) //nolint: wrapcheck
 	}
 }

 func (w *wrapperCtx) Close() error {
 	w.cancel()
-	return w.parent.Close()
+
+	return w.parent.Close() //nolint: wrapcheck
 }

 func (w *wrapperCtx) Conn() net.Conn {
@@ -80,7 +84,8 @@ func (w *wrapperCtx) RemoteAddr() *net.TCPAddr {

 func NewCtx(ctx context.Context,
 	cancel context.CancelFunc,
-	parent conntypes.StreamReadWriteCloser) conntypes.StreamReadWriteCloser {
+	parent conntypes.StreamReadWriteCloser,
+) conntypes.StreamReadWriteCloser {
 	return &wrapperCtx{
 		parent: parent,
 		ctx:    ctx,
@@ -7,10 +7,9 @@ import (
 	"net"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/tlstypes"
+	"go.uber.org/zap"
 )

 type wrapperFakeTLS struct {
@@ -21,7 +20,7 @@ type wrapperFakeTLS struct {

 func (w *wrapperFakeTLS) Write(p []byte) (int, error) {
 	return w.write(p, func(b []byte) (int, error) {
-		return w.parent.Write(b)
+		return w.parent.Write(b) //nolint: wrapcheck
 	})
 }

@@ -31,21 +30,20 @@ func (w *wrapperFakeTLS) WriteTimeout(p []byte, timeout time.Duration) (int, err
 	return w.write(p, func(b []byte) (int, error) {
 		elapsed := time.Since(startTime)
 		if elapsed > timeout {
-			return w.parent.WriteTimeout(b, timeout-elapsed)
+			return w.parent.WriteTimeout(b, timeout-elapsed) //nolint: wrapcheck
 		}
+
 		return 0, errors.New("timeout")
 	})
 }

 func (w *wrapperFakeTLS) write(p []byte, writeFunc func([]byte) (int, error)) (int, error) {
 	sum := 0
-
-	buf := acquireBytesBuffer()
-	defer releaseBytesBuffer(buf)
+	buf := bytes.Buffer{}

 	for _, v := range tlstypes.MakeRecords(p) {
 		buf.Reset()
-		v.WriteBytes(buf)
+		v.WriteBytes(&buf)

 		_, err := writeFunc(buf.Bytes())
 		if err != nil {
@@ -75,7 +73,7 @@ func (w *wrapperFakeTLS) RemoteAddr() *net.TCPAddr {
 }

 func (w *wrapperFakeTLS) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func NewFakeTLS(socket conntypes.StreamReadWriteCloser) conntypes.StreamReadWriteCloser {
@@ -87,7 +85,7 @@ func NewFakeTLS(socket conntypes.StreamReadWriteCloser) conntypes.StreamReadWrit
 		for {
 			rec, err := tlstypes.ReadRecord(faketls.parent)
 			if err != nil {
-				return nil, err
+				return nil, err //nolint: wrapcheck
 			}

 			switch rec.Type {
@@ -97,6 +95,8 @@ func NewFakeTLS(socket conntypes.StreamReadWriteCloser) conntypes.StreamReadWrit
 				rec.Data.WriteBytes(buf)

 				return buf.Bytes(), nil
+			case tlstypes.RecordTypeHandshake:
+				return nil, errors.New("unsupported record type handshake")
 			default:
 				return nil, fmt.Errorf("unsupported record type %v", rec.Type)
 			}
@@ -1,10 +1,11 @@
 package stream

 import (
+	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
-	"crypto/md5"  // nolint: gosec
-	"crypto/sha1" // nolint: gosec
+	"crypto/md5"
+	"crypto/sha1"
 	"encoding/binary"
 	"net"

@@ -25,7 +26,8 @@ var mtprotoEmptyIP = [4]byte{0x00, 0x00, 0x00, 0x00}
 func NewMiddleProxyCipher(parent conntypes.StreamReadWriteCloser,
 	req *rpc.NonceRequest,
 	resp *rpc.NonceResponse,
-	secret []byte) conntypes.StreamReadWriteCloser {
+	secret []byte,
+) conntypes.StreamReadWriteCloser {
 	localAddr := parent.LocalAddr()
 	remoteAddr := parent.RemoteAddr()

@@ -52,13 +54,13 @@ func mtprotoDeriveKeys(purpose mtprotoCipherPurpose,
 	req *rpc.NonceRequest,
 	resp *rpc.NonceResponse,
 	client, remote *net.TCPAddr,
-	secret []byte) ([]byte, []byte) {
-	message := acquireBytesBuffer()
-	defer releaseBytesBuffer(message)
+	secret []byte,
+) ([]byte, []byte) {
+	message := bytes.Buffer{}

-	message.Write(resp.Nonce)   // nolint: gosec
-	message.Write(req.Nonce)    // nolint: gosec
-	message.Write(req.CryptoTS) // nolint: gosec
+	message.Write(resp.Nonce)
+	message.Write(req.Nonce)
+	message.Write(req.CryptoTS)

 	clientIPv4 := mtprotoEmptyIP[:]
 	serverIPv4 := mtprotoEmptyIP[:]
@@ -68,41 +70,41 @@ func mtprotoDeriveKeys(purpose mtprotoCipherPurpose,
 		serverIPv4 = utils.ReverseBytes(remote.IP.To4())
 	}

-	message.Write(serverIPv4) // nolint: gosec
+	message.Write(serverIPv4)

 	var port [2]byte

 	binary.LittleEndian.PutUint16(port[:], uint16(client.Port))
-	message.Write(port[:]) // nolint: gosec
+	message.Write(port[:])

 	switch purpose {
 	case mtprotoCipherPurposeClient:
-		message.WriteString("CLIENT") // nolint: gosec
+		message.WriteString("CLIENT")
 	case mtprotoCipherPurposeServer:
-		message.WriteString("SERVER") // nolint: gosec
+		message.WriteString("SERVER")
 	default:
 		panic("Unexpected cipher purpose")
 	}

-	message.Write(clientIPv4) // nolint: gosec
+	message.Write(clientIPv4)
 	binary.LittleEndian.PutUint16(port[:], uint16(remote.Port))
-	message.Write(port[:])    // nolint: gosec
-	message.Write(secret)     // nolint: gosec
-	message.Write(resp.Nonce) // nolint: gosec
+	message.Write(port[:])
+	message.Write(secret)
+	message.Write(resp.Nonce)

 	if client.IP.To4() == nil {
-		message.Write(client.IP.To16()) // nolint: gosec
-		message.Write(remote.IP.To16()) // nolint: gosec
+		message.Write(client.IP.To16())
+		message.Write(remote.IP.To16())
 	}

-	message.Write(req.Nonce) // nolint: gosec
+	message.Write(req.Nonce)

 	data := message.Bytes()
-	md5sum := md5.Sum(data[1:]) // nolint: gas
-	sha1sum := sha1.Sum(data)   // nolint: gosec
+	md5sum := md5.Sum(data[1:]) //nolint: gas
+	sha1sum := sha1.Sum(data)   //nolint: gosec

 	key := append(md5sum[:12], sha1sum[:]...)
-	iv := md5.Sum(data[2:]) // nolint: gas
+	iv := md5.Sum(data[2:]) //nolint: gas

 	return key, iv[:]
 }
@@ -1,14 +1,14 @@
 package stream

 import (
+	"bytes"
 	"crypto/cipher"
 	"fmt"
 	"net"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 type wrapperObfuscated2 struct {
@@ -31,7 +31,7 @@ func (w *wrapperObfuscated2) ReadTimeout(p []byte, timeout time.Duration) (int,
 func (w *wrapperObfuscated2) Read(p []byte) (int, error) {
 	n, err := w.parent.Read(p)
 	if err != nil {
-		return n, err
+		return n, err //nolint: wrapcheck
 	}

 	w.decryptor.XORKeyStream(p, p[:n])
@@ -40,8 +40,7 @@ func (w *wrapperObfuscated2) Read(p []byte) (int, error) {
 }

 func (w *wrapperObfuscated2) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	buffer := acquireBytesBuffer()
-	defer releaseBytesBuffer(buffer)
+	buffer := bytes.Buffer{}

 	buffer.Write(p)

@@ -49,12 +48,11 @@ func (w *wrapperObfuscated2) WriteTimeout(p []byte, timeout time.Duration) (int,

 	w.encryptor.XORKeyStream(buf, buf)

-	return w.parent.WriteTimeout(buf, timeout)
+	return w.parent.WriteTimeout(buf, timeout) //nolint: wrapcheck
 }

 func (w *wrapperObfuscated2) Write(p []byte) (int, error) {
-	buffer := acquireBytesBuffer()
-	defer releaseBytesBuffer(buffer)
+	buffer := bytes.Buffer{}

 	buffer.Write(p)

@@ -62,7 +60,7 @@ func (w *wrapperObfuscated2) Write(p []byte) (int, error) {

 	w.encryptor.XORKeyStream(buf, buf)

-	return w.parent.Write(buf)
+	return w.parent.Write(buf) //nolint: wrapcheck
 }

 func (w *wrapperObfuscated2) Conn() net.Conn {
@@ -82,11 +80,12 @@ func (w *wrapperObfuscated2) RemoteAddr() *net.TCPAddr {
 }

 func (w *wrapperObfuscated2) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func NewObfuscated2(socket conntypes.StreamReadWriteCloser,
-	encryptor, decryptor cipher.Stream) conntypes.StreamReadWriteCloser {
+	encryptor, decryptor cipher.Stream,
+) conntypes.StreamReadWriteCloser {
 	return &wrapperObfuscated2{
 		parent:    socket,
 		encryptor: encryptor,
@@ -1,23 +0,0 @@
-package stream
-
-import (
-	"bytes"
-	"sync"
-)
-
-var (
-	poolBytesBuffer = sync.Pool{
-		New: func() interface{} {
-			return &bytes.Buffer{}
-		},
-	}
-)
-
-func acquireBytesBuffer() *bytes.Buffer {
-	return poolBytesBuffer.Get().(*bytes.Buffer)
-}
-
-func releaseBytesBuffer(buf *bytes.Buffer) {
-	buf.Reset()
-	poolBytesBuffer.Put(buf)
-}
@@ -7,9 +7,8 @@ import (
 	"sync"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 type ReadWriteCloseRewinder interface {
@@ -18,56 +17,32 @@ type ReadWriteCloseRewinder interface {
 }

 type wrapperRewind struct {
-	parent   conntypes.StreamReadWriteCloser
-	buf      bytes.Buffer
-	mutex    sync.Mutex
-	rewinded bool
+	parent       conntypes.StreamReadWriteCloser
+	activeReader io.Reader
+	buf          bytes.Buffer
+	mutex        sync.Mutex
 }

 func (w *wrapperRewind) Write(p []byte) (int, error) {
-	return w.parent.Write(p)
+	return w.parent.Write(p) //nolint: wrapcheck
 }

 func (w *wrapperRewind) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.WriteTimeout(p, timeout)
+	return w.parent.WriteTimeout(p, timeout) //nolint: wrapcheck
 }

 func (w *wrapperRewind) Read(p []byte) (int, error) {
 	w.mutex.Lock()
 	defer w.mutex.Unlock()

-	if w.rewinded {
-		if n, err := w.buf.Read(p); err != io.EOF {
-			return n, err
-		}
-	}
-
-	n, err := w.parent.Read(p)
-
-	if !w.rewinded {
-		w.buf.Write(p[:n])
-	}
-
-	return n, err
+	return w.activeReader.Read(p) //nolint: wrapcheck
 }

-func (w *wrapperRewind) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
+func (w *wrapperRewind) ReadTimeout(p []byte, _ time.Duration) (int, error) {
 	w.mutex.Lock()
 	defer w.mutex.Unlock()

-	if w.rewinded {
-		if n, err := w.buf.Read(p); err != io.EOF {
-			return n, err
-		}
-	}
-
-	n, err := w.parent.ReadTimeout(p, timeout)
-
-	if !w.rewinded {
-		w.buf.Write(p[:n])
-	}
-
-	return n, err
+	return w.activeReader.Read(p) //nolint: wrapcheck
 }

 func (w *wrapperRewind) Conn() net.Conn {
@@ -88,17 +63,21 @@ func (w *wrapperRewind) RemoteAddr() *net.TCPAddr {

 func (w *wrapperRewind) Close() error {
 	w.buf.Reset()
-	return w.parent.Close()
+
+	return w.parent.Close() //nolint: wrapcheck
 }

 func (w *wrapperRewind) Rewind() {
 	w.mutex.Lock()
-	w.rewinded = true
+	w.activeReader = io.MultiReader(&w.buf, w.parent)
 	w.mutex.Unlock()
 }

 func NewRewind(parent conntypes.StreamReadWriteCloser) ReadWriteCloseRewinder {
-	return &wrapperRewind{
+	rv := &wrapperRewind{
 		parent: parent,
 	}
+	rv.activeReader = io.TeeReader(parent, &rv.buf)
+
+	return rv
 }
@@ -5,10 +5,9 @@ import (
 	"sync"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/stats"
+	"go.uber.org/zap"
 )

 type wrapperTelegramStats struct {
@@ -18,19 +17,19 @@ type wrapperTelegramStats struct {
 }

 func (w *wrapperTelegramStats) Write(p []byte) (int, error) {
-	return w.parent.Write(p)
+	return w.parent.Write(p) //nolint: wrapcheck
 }

 func (w *wrapperTelegramStats) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.WriteTimeout(p, timeout)
+	return w.parent.WriteTimeout(p, timeout) //nolint: wrapcheck
 }

 func (w *wrapperTelegramStats) Read(p []byte) (int, error) {
-	return w.parent.Read(p)
+	return w.parent.Read(p) //nolint: wrapcheck
 }

 func (w *wrapperTelegramStats) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.ReadTimeout(p, timeout)
+	return w.parent.ReadTimeout(p, timeout) //nolint: wrapcheck
 }

 func (w *wrapperTelegramStats) Conn() net.Conn {
@@ -57,7 +56,7 @@ func (w *wrapperTelegramStats) Close() error {
 		stats.Stats.TelegramDisconnected(w.dc, w.RemoteAddr())
 	})

-	return err
+	return err //nolint: wrapcheck
 }

 func NewTelegramStats(dc conntypes.DC, parent conntypes.StreamReadWriteCloser) conntypes.StreamReadWriteCloser {
@@ -4,10 +4,9 @@ import (
 	"net"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/stats"
+	"go.uber.org/zap"
 )

 type wrapperTrafficStats struct {
@@ -18,28 +17,28 @@ func (w *wrapperTrafficStats) Write(p []byte) (int, error) {
 	n, err := w.parent.Write(p)
 	stats.Stats.EgressTraffic(n)

-	return n, err
+	return n, err //nolint: wrapcheck
 }

 func (w *wrapperTrafficStats) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
 	n, err := w.parent.WriteTimeout(p, timeout)
 	stats.Stats.EgressTraffic(n)

-	return n, err
+	return n, err //nolint: wrapcheck
 }

 func (w *wrapperTrafficStats) Read(p []byte) (int, error) {
 	n, err := w.parent.Read(p)
 	stats.Stats.IngressTraffic(n)

-	return n, err
+	return n, err //nolint: wrapcheck
 }

 func (w *wrapperTrafficStats) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
 	n, err := w.parent.ReadTimeout(p, timeout)
 	stats.Stats.IngressTraffic(n)

-	return n, err
+	return n, err //nolint: wrapcheck
 }

 func (w *wrapperTrafficStats) Conn() net.Conn {
@@ -59,7 +58,7 @@ func (w *wrapperTrafficStats) RemoteAddr() *net.TCPAddr {
 }

 func (w *wrapperTrafficStats) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func NewTrafficStats(parent conntypes.StreamReadWriteCloser) conntypes.StreamReadWriteCloser {
@@ -4,9 +4,8 @@ import (
 	"net"
 	"time"

-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )

 const (
@@ -19,23 +18,23 @@ type wrapperTimeout struct {
 }

 func (w *wrapperTimeout) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.WriteTimeout(p, timeout)
+	return w.parent.WriteTimeout(p, timeout) //nolint: wrapcheck
 }

 func (w *wrapperTimeout) Write(p []byte) (int, error) {
-	return w.parent.WriteTimeout(p, timeoutWrite)
+	return w.parent.WriteTimeout(p, timeoutWrite) //nolint: wrapcheck
 }

 func (w *wrapperTimeout) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.ReadTimeout(p, timeout)
+	return w.parent.ReadTimeout(p, timeout) //nolint: wrapcheck
 }

 func (w *wrapperTimeout) Read(p []byte) (int, error) {
-	return w.parent.ReadTimeout(p, timeoutRead)
+	return w.parent.ReadTimeout(p, timeoutRead) //nolint: wrapcheck
 }

 func (w *wrapperTimeout) Close() error {
-	return w.parent.Close()
+	return w.parent.Close() //nolint: wrapcheck
 }

 func (w *wrapperTimeout) Conn() net.Conn {
Author	SHA1	Message	Date
9seconds	64859069ed	Align buildinfo with master	2022-08-09 17:43:29 +03:00
9seconds	c1935b4cef	Update dependencies	2022-08-09 17:42:31 +03:00
9seconds	f48156814b	Update to go 1.19	2022-08-09 17:41:59 +03:00
Sergey ArkhipovandGitHub	9d67414db6	Merge pull request #264 from 9seconds/goreleaser-v1 Use goreleaser for v1	2022-03-21 14:32:11 +03:00
9seconds	a587f85dd2	Use goreleaser for v1	2022-03-21 14:30:06 +03:00
9seconds	18a52340fa	Update dependencies	2022-03-21 12:44:03 +03:00
9seconds	981ffb0dbe	Update update-deps target	2022-03-21 12:43:29 +03:00
Sergey ArkhipovandGitHub	b976e74fc0	Merge pull request #260 from 9seconds/go118-v1 Support of Go 1.18 for v1	2022-03-19 15:10:20 +03:00
9seconds	b2de98c8f9	Update docker build timeout	2022-03-19 14:52:41 +03:00
9seconds	6f3abf0990	Update dockerfile	2022-03-19 14:36:17 +03:00
9seconds	e74726af70	Updates for go 1.18	2022-03-19 14:36:04 +03:00
9seconds	8da55410de	Run gofumpt	2022-03-19 14:12:14 +03:00
9seconds	4b1f823777	Update dependencies	2021-08-30 14:49:23 +03:00
Sergey ArkhipovandGitHub	511090b806	Merge pull request #205 from 9seconds/golang-1.17-v1 [v1] Upgrade to golang 1.17	2021-08-30 11:54:33 +03:00
Sergey ArkhipovandGitHub	eba378817e	Merge pull request #204 from 9seconds/golangcilint-1.42-v1 [v1] Upgrade golangci-lint for 1.42	2021-08-30 11:54:03 +03:00
9seconds	c178b4b9cc	Upgrade to golang 1.17	2021-08-30 11:51:11 +03:00
9seconds	3e0880f6b4	Upgrade golangci-lint for 1.42	2021-08-30 11:46:32 +03:00
Sergey ArkhipovandGitHub	7718f62477	Merge pull request #179 from 9seconds/golang1.16 Update dockerfile to golang 1.16	2021-03-03 17:54:13 +03:00
9seconds	df0994dad3	Update dockerfile to golang 1.16	2021-03-03 17:43:38 +03:00
Sergey ArkhipovandGitHub	dca43853fb	Merge pull request #178 from 9seconds/ci-arm32 Build for arm 32 platforms	2021-03-03 17:42:59 +03:00
9seconds	ea8e31346c	Build for arm 32 platforms	2021-03-03 17:30:47 +03:00
Sergey ArkhipovandGitHub	ed495b3800	Merge pull request #177 from 9seconds/faketls-hotfix Correct rewinding for faketls	2021-03-03 17:24:38 +03:00
9seconds	4025f223c4	Correct rewinding for faketls	2021-03-03 17:18:16 +03:00
9seconds	90e0ce4c48	Update dependencies	2021-02-26 08:22:01 +03:00
Sergey ArkhipovandGitHub	ac0b442b43	Merge pull request #176 from 9seconds/fix-urls Fix urls for missed IPs	2021-03-03 15:40:15 +03:00
9seconds	af7021fac8	Fix urls for missed IPs	2021-02-26 08:11:34 +03:00
9seconds	5468625212	Use CI on supported branches	2021-02-26 08:04:22 +03:00
9seconds	345c1bf715	Update ignores	2021-02-26 04:41:08 +03:00
Sergey ArkhipovandGitHub	52d47a9786	Create codeql-analysis.yml	2021-03-02 22:01:47 +03:00
Sergey ArkhipovandGitHub	2ba79a8508	Create SECURITY.md	2021-03-02 22:00:18 +03:00
Sergey ArkhipovandGitHub	ce7769472d	Merge pull request #175 from 9seconds/ci Integrate with Github actions	2021-03-02 21:43:20 +03:00
Sergey ArkhipovandGitHub	eb5eea2625	Merge pull request #174 from 9seconds/linter Update golangci-linter	2021-03-02 16:18:05 +03:00
Sergey ArkhipovandGitHub	d965dc3c07	Merge pull request #173 from 9seconds/simplify-makefile Simplify Makefile	2021-03-02 15:52:29 +03:00
9seconds	040b3c371c	Add github workflow	2021-02-26 04:12:00 +03:00
9seconds	c7ba8e54be	Remove travis	2021-02-26 03:58:48 +03:00
9seconds	33b1a5426c	Update golangci-linter	2021-02-26 00:52:09 +03:00
9seconds	91197c0334	Simplify Makefile This commit removes GO111MODULE and simplifies internal structure	2021-02-26 00:25:16 +03:00
Sergey ArkhipovandGitHub	e075169dd4	Merge pull request #166 from biozz/fix-statsd-docs Fix docs related to statsd usage	2021-01-06 08:08:02 +03:00
Ivan Elfimov	225444b1b3	Update README.md - remove MTG_STATSD_PORT, because it is not used in the code - update MTG_STATSD_ADDR description to reflect all possible use cases	2021-01-02 21:21:23 +03:00
Sergey ArkhipovandGitHub	586ac9dcb9	Merge pull request #160 from a68366/master Fix t.me QR code. Closes #159	2020-10-19 10:56:39 +03:00
a68366andGitHub	c3be5311e8	Fix t.me QR code. Closes #159	2020-10-08 19:32:36 +03:00
9seconds	bfeded67ee	Update travis	2020-09-21 11:46:13 +03:00
9seconds	dde0d25b77	Update golangci lint to 1.31.0	2020-09-21 11:45:09 +03:00
9seconds	296a34cd6e	Update dockerfile to use 1.15	2020-09-21 11:44:06 +03:00
9seconds	44cea68e83	Upgrade dependencies	2020-09-21 11:43:23 +03:00
Sergey ArkhipovandGitHub	5d17e264e6	Merge pull request #156 from 9seconds/no-pools Get rid of sync pools	2020-08-10 15:20:15 +03:00
9seconds	7ef1e99f66	Add 1.14 to a travis	2020-08-10 15:02:05 +03:00
9seconds	3acbacbdb3	Install lint in a local directory	2020-08-10 15:01:38 +03:00
9seconds	5fd7062972	Update dependencies	2020-08-10 14:41:22 +03:00
9seconds	7a6695f6c4	Update golangci-lint	2020-08-10 14:39:50 +03:00
9seconds	8ac786581b	Update golangci lint	2020-08-10 13:30:07 +03:00
9seconds	86a8f69273	Cleanup pools from wrappes	2020-08-10 13:29:08 +03:00
9seconds	95b16cd805	Cleanup pools from tlstypes	2020-08-10 13:27:23 +03:00
9seconds	3996b9a6b8	Remove pools from faketls	2020-08-10 13:21:30 +03:00
Sergey ArkhipovandGitHub	e286dea650	Merge pull request #151 from FollowMeDown/master Fix Keep-Alive Issue for OpenBSD/ArchLinux	2020-08-10 12:49:16 +03:00
DEFACE	5e27e48129	Fix Keep-Alive Issue for OpenBSD/ArchLinux	2020-06-15 21:38:35 +02:00
Sergey ArkhipovandGitHub	95abb54dc8	Merge pull request #146 from 9seconds/fix-docker-image Updates for dockerfile	2020-05-19 11:31:25 +03:00
9seconds	dbd3d3c266	Updates for dockerfile	2020-05-19 11:26:08 +03:00