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

.dockerignore

@@ -1,9 +1,3 @@
+version.go
 vendor/
 tags
-.github/
-.bin/
-*.md
-mtg
-.golangci.toml
-.gitignore
-run.sh

.github/workflows/ci.yaml

@@ -1,131 +0,0 @@
----
-
-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

.github/workflows/codeql-analysis.yml

@@ -1,69 +0,0 @@
-# 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

.gitignore

@@ -7,5 +7,6 @@
 *.out
 mtg
 vendor/
+version.go
+ccbuilds/
 .bin/
-dist/

.golangci.toml

@@ -3,20 +3,11 @@ concurrency = 4
 deadline = "2m"
 tests = true
 skip-dirs = ["vendor"]
+skip-files = ["version.go"]
 
 [output]
 format = "colored-line-number"
 
 [linters]
 enable-all = true
-disable = [
+disable = ["gochecknoglobals", "gas", "gomnd", "goerr113"]
-    "containedctx",
-    "exhaustivestruct",
-    "exhaustruct",
-    "gas",
-    "gochecknoglobals",
-    "goerr113",
-    "ireturn",
-    "thelper",
-    "varnamelen",
-]

.goreleaser.yml

@@ -1,65 +0,0 @@
----
-
-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'

.travis.yml

@@ -0,0 +1,21 @@
+---
+
+language: go
+sudo: false
+dist: trusty
+
+go:
+  - 1.15.x
+  - 1.14.x
+  - 1.13.x
+  - master
+
+before_script: make prepare
+
+script:
+  - make all
+  - make lint
+
+matrix:
+  allow_failures:
+    - go: master

Dockerfile

@@ -1,7 +1,7 @@
 ###############################################################################
 # BUILD STAGE
 
-FROM golang:1.19-alpine AS build
+FROM golang:1.15-alpine AS build
 
 RUN set -x \
   && apk --no-cache --update add \
@@ -9,13 +9,15 @@ RUN set -x \
     ca-certificates \
     curl \
     git \
-    make
+    make \
+    upx
 
-COPY . /app
+COPY . /go/src/github.com/9seconds/mtg/
-WORKDIR /app
+WORKDIR /go/src/github.com/9seconds/mtg
 
 RUN set -x \
-  && make -j 4 static
+  && make -j 4 static \
+  && upx --ultra-brute -qq ./mtg
 
 
 ###############################################################################
@@ -29,4 +31,4 @@ ENV MTG_BIND=0.0.0.0:3128 \
 EXPOSE 3128 3129
 
 COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY --from=build /app/mtg /mtg
+COPY --from=build /go/src/github.com/9seconds/mtg/mtg /mtg

Makefile

@@ -2,41 +2,58 @@ ROOT_DIR     := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
 IMAGE_NAME   := mtg
 APP_NAME     := $(IMAGE_NAME)
 
-GOLANGCI_LINT_VERSION := v1.48.0
+CC_BINARIES  := $(shell bash -c "echo -n $(APP_NAME)-{linux,freebsd,openbsd}-{386,amd64} $(APP_NAME)-linux-{arm,arm64}")
+
+GOLANGCI_LINT_VERSION := v1.31.0
 
 VERSION_GO         := $(shell go version)
 VERSION_DATE       := $(shell date -Ru)
 VERSION_TAG        := $(shell git describe --tags --always)
-COMMON_BUILD_FLAGS := -trimpath -mod=readonly -ldflags="-s -w -X 'main.version=$(VERSION_TAG) ($(VERSION_GO)) [$(VERSION_DATE)]'"
+COMMON_BUILD_FLAGS := -ldflags="-s -w -X 'main.version=$(VERSION_TAG) ($(VERSION_GO)) [$(VERSION_DATE)]'"
 
-GOBIN  := $(ROOT_DIR)/.bin
+MOD_ON  := env GO111MODULE=on
-GOTOOL := env "GOBIN=$(GOBIN)" "PATH=$(ROOT_DIR)/.bin:$(PATH)"
+MOD_OFF := env GO111MODULE=auto
 
 # -----------------------------------------------------------------------------
 
-.PHONY: all
+$(APP_NAME):
-all: build
+	@$(MOD_ON) go build $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
 
-.PHONY: build
+static-$(APP_NAME):
-build:
+	@$(MOD_ON) env CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
-	@go build $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
 
-$(APP_NAME): build
+$(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)"
 
-.PHONY: static
+ccbuilds:
-static:
+	@rm -rf ./ccbuilds && mkdir -p ./ccbuilds
-	@env CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
 
 vendor: go.mod go.sum
 	@$(MOD_ON) go mod vendor
 
-.PHONY: test
+# -----------------------------------------------------------------------------
-test:
-	@go test -v ./...
 
-.PHONY: citest
+.PHONY: all
-citest:
+all: $(APP_NAME)
-	@go test -coverprofile=coverage.txt -covermode=atomic -race -v ./...
+
+.PHONY: static
+static: static-$(APP_NAME)
+
+.PHONY: crosscompile
+crosscompile: $(CC_BINARIES)
+
+.PHONY: crosscompile-dir
+crosscompile-dir:
+	@rm -rf "$(CC_DIR)" && mkdir -p "$(CC_DIR)"
+
+.PHONY: lint
+lint: vendor
+	@$(MOD_OFF) "$(ROOT_DIR)/.bin/golangci-lint" run
 
 .PHONY: clean
 clean:
@@ -44,50 +61,15 @@ 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: doc
+.PHONY: prepare
-doc:
+prepare: install-lint
-	@$(GOTOOL) godoc -http 0.0.0.0:10000
 
-.PHONY: fmt
+.PHONY: install-lint
-fmt:
+install-lint:
-	@$(GOTOOL) gofumpt -w -extra "$(ROOT_DIR)"
+	@mkdir -p ./bin || true && \
-
-.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)"
+		| $(MOD_OFF) bash -s -- -b "$(ROOT_DIR)/.bin" $(GOLANGCI_LINT_VERSION)
-
-.PHONY: install-tools-godoc
-install-tools-godoc:
-	@mkdir -p "$(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

README.md

@@ -189,7 +189,8 @@ 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`              |                                   | host:port of statsd service. No defaults, by default we do not send anything there.                                                                                                                                                                                             |
+| `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_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.                                                                                                                                                                                 |

SECURITY.md

@@ -1,24 +0,0 @@
-# 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

buildinfo.go

@@ -1,84 +0,0 @@
-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)))
-}

cli/proxy.go

@@ -19,7 +19,7 @@ import (
 	"go.uber.org/zap/zapcore"
 )
 
-func Proxy() error { //nolint: funlen,cyclop
+func Proxy() error { // nolint: funlen
 	ctx := utils.GetSignalContext()
 
 	atom := zap.NewAtomicLevel()
@@ -41,7 +41,7 @@ func Proxy() error { //nolint: funlen,cyclop
 	))
 
 	zap.ReplaceGlobals(logger)
-	defer logger.Sync() //nolint: errcheck
+	defer logger.Sync() // nolint: errcheck
 
 	if err := config.InitPublicAddress(ctx); err != nil {
 		Fatal(err)

cli/utils.go

@@ -9,7 +9,7 @@ import (
 
 func Fatal(arg interface{}) {
 	if value, ok := arg.(error); ok {
-		arg = fmt.Errorf("fatal error: %+v", value) //nolint: errorlint
+		arg = fmt.Errorf("fatal error: %+v", value)
 	}
 
 	PrintStderr(arg)
@@ -21,7 +21,7 @@ func PrintStderr(args ...interface{}) {
 }
 
 func PrintStdout(args ...interface{}) {
-	fmt.Println(args...) //nolint: forbidigo
+	fmt.Println(args...)
 }
 
 func PrintJSONStderr(data interface{}) {

config/config.go

@@ -79,29 +79,29 @@ const (
 
 type Config struct {
 	Bind             *net.TCPAddr      `json:"bind"`
-	PublicIPv4       *net.TCPAddr      `json:"public_ipv4"`        //nolint: tagliatelle
+	PublicIPv4       *net.TCPAddr      `json:"public_ipv4"`
-	PublicIPv6       *net.TCPAddr      `json:"public_ipv6"`        //nolint: tagliatelle
+	PublicIPv6       *net.TCPAddr      `json:"public_ipv6"`
-	StatsBind        *net.TCPAddr      `json:"stats_bind"`         //nolint: tagliatelle
+	StatsBind        *net.TCPAddr      `json:"stats_bind"`
-	StatsdAddr       *net.TCPAddr      `json:"stats_addr"`         //nolint: tagliatelle
+	StatsdAddr       *net.TCPAddr      `json:"stats_addr"`
-	StatsdTagsFormat *statsd.TagFormat `json:"statsd_tags_format"` //nolint: tagliatelle
+	StatsdTagsFormat *statsd.TagFormat `json:"statsd_tags_format"`
 
-	StatsNamespace string            `json:"stats_namespace"` //nolint: tagliatelle
+	StatsNamespace string            `json:"stats_namespace"`
-	CloakHost      string            `json:"cloak_host"`      //nolint: tagliatelle
+	CloakHost      string            `json:"cloak_host"`
-	StatsdTags     map[string]string `json:"statsd_tags"`     //nolint: tagliatelle
+	StatsdTags     map[string]string `json:"statsd_tags"`
 
-	WriteBuffer int `json:"write_buffer"` //nolint: tagliatelle
+	WriteBuffer int `json:"write_buffer"`
-	ReadBuffer  int `json:"read_buffer"`  //nolint: tagliatelle
+	ReadBuffer  int `json:"read_buffer"`
-	CloakPort   int `json:"cloak_port"`   //nolint: tagliatelle
+	CloakPort   int `json:"cloak_port"`
 
-	AntiReplayMaxSize int `json:"anti_replay_max_size"` //nolint: tagliatelle
+	AntiReplayMaxSize int `json:"anti_replay_max_size"`
 
-	MultiplexPerConnection int `json:"multiplex_per_connection"` //nolint: tagliatelle
+	MultiplexPerConnection int `json:"multiplex_per_connection"`
 
 	Debug      bool       `json:"debug"`
 	Verbose    bool       `json:"verbose"`
-	SecretMode SecretMode `json:"secret_mode"` //nolint: tagliatelle
+	SecretMode SecretMode `json:"secret_mode"`
-	PreferIP   PreferIP   `json:"prefer_ip"`   //nolint: tagliatelle
+	PreferIP   PreferIP   `json:"prefer_ip"`
-	NTPServers []string   `json:"ntp_servers"` //nolint: tagliatelle
+	NTPServers []string   `json:"ntp_servers"`
 
 	Secret []byte `json:"secret"`
 	AdTag  []byte `json:"adtag"`
@@ -146,7 +146,7 @@ func (c *Config) adjustProxyValue(value int) int {
 
 	fvalue := float64(value)
 
-	newValue := fvalue * 2 * math.Log(float64(c.MultiplexPerConnection)) //nolint: gomnd
+	newValue := fvalue * 2 * math.Log(float64(c.MultiplexPerConnection))
 	newValue = math.Ceil(newValue)
 	newValue = math.Max(fvalue, newValue)
 
@@ -160,15 +160,15 @@ type Opt struct {
 
 var C = Config{}
 
-func Init(options ...Opt) error { //nolint: gocyclo, funlen, cyclop
+func Init(options ...Opt) error { // nolint: gocyclo, funlen
 	for _, opt := range options {
 		switch opt.Option {
 		case OptionTypeDebug:
-			C.Debug = opt.Value.(bool) //nolint: forcetypeassert
+			C.Debug = opt.Value.(bool)
 		case OptionTypeVerbose:
-			C.Verbose = opt.Value.(bool) //nolint: forcetypeassert
+			C.Verbose = opt.Value.(bool)
 		case OptionTypePreferIP:
-			value := opt.Value.(string) //nolint: forcetypeassert
+			value := opt.Value.(string)
 			switch value {
 			case "ipv4":
 				C.PreferIP = PreferIPv4
@@ -178,25 +178,25 @@ func Init(options ...Opt) error { //nolint: gocyclo, funlen, cyclop
 				return fmt.Errorf("incorrect direct IP mode %s", value)
 			}
 		case OptionTypeBind:
-			C.Bind = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
+			C.Bind = opt.Value.(*net.TCPAddr)
 		case OptionTypePublicIPv4:
-			C.PublicIPv4 = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
+			C.PublicIPv4 = opt.Value.(*net.TCPAddr)
 			if C.PublicIPv4 == nil {
 				C.PublicIPv4 = &net.TCPAddr{}
 			}
 		case OptionTypePublicIPv6:
-			C.PublicIPv6 = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
+			C.PublicIPv6 = opt.Value.(*net.TCPAddr)
 			if C.PublicIPv6 == nil {
 				C.PublicIPv6 = &net.TCPAddr{}
 			}
 		case OptionTypeStatsBind:
-			C.StatsBind = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
+			C.StatsBind = opt.Value.(*net.TCPAddr)
 		case OptionTypeStatsNamespace:
-			C.StatsNamespace = opt.Value.(string) //nolint: forcetypeassert
+			C.StatsNamespace = opt.Value.(string)
 		case OptionTypeStatsdAddress:
-			C.StatsdAddr = opt.Value.(*net.TCPAddr) //nolint: forcetypeassert
+			C.StatsdAddr = opt.Value.(*net.TCPAddr)
 		case OptionTypeStatsdTagsFormat:
-			value := opt.Value.(string) //nolint: forcetypeassert
+			value := opt.Value.(string)
 			switch value {
 			case "datadog":
 				C.StatsdTagsFormat = statsd.TagFormatDatadog
@@ -206,26 +206,26 @@ func Init(options ...Opt) error { //nolint: gocyclo, funlen, cyclop
 				return fmt.Errorf("incorrect statsd tag %s", value)
 			}
 		case OptionTypeStatsdTags:
-			C.StatsdTags = opt.Value.(map[string]string) //nolint: forcetypeassert
+			C.StatsdTags = opt.Value.(map[string]string)
 		case OptionTypeWriteBufferSize:
-			C.WriteBuffer = int(opt.Value.(units.Base2Bytes)) //nolint: forcetypeassert
+			C.WriteBuffer = int(opt.Value.(units.Base2Bytes))
 		case OptionTypeReadBufferSize:
-			C.ReadBuffer = int(opt.Value.(units.Base2Bytes)) //nolint: forcetypeassert
+			C.ReadBuffer = int(opt.Value.(units.Base2Bytes))
 		case OptionTypeCloakPort:
-			C.CloakPort = int(opt.Value.(uint16)) //nolint: forcetypeassert
+			C.CloakPort = int(opt.Value.(uint16))
 		case OptionTypeAntiReplayMaxSize:
-			C.AntiReplayMaxSize = int(opt.Value.(units.Base2Bytes)) //nolint: forcetypeassert
+			C.AntiReplayMaxSize = int(opt.Value.(units.Base2Bytes))
 		case OptionTypeMultiplexPerConnection:
-			C.MultiplexPerConnection = int(opt.Value.(uint)) //nolint: forcetypeassert
+			C.MultiplexPerConnection = int(opt.Value.(uint))
 		case OptionTypeNTPServers:
-			C.NTPServers = opt.Value.([]string) //nolint: forcetypeassert
+			C.NTPServers = opt.Value.([]string)
 			if len(C.NTPServers) == 0 {
 				return errors.New("ntp server list is empty")
 			}
 		case OptionTypeSecret:
-			C.Secret = opt.Value.([]byte) //nolint: forcetypeassert
+			C.Secret = opt.Value.([]byte)
 		case OptionTypeAdtag:
-			C.AdTag = opt.Value.([]byte) //nolint: forcetypeassert
+			C.AdTag = opt.Value.([]byte)
 		default:
 			return fmt.Errorf("unknown tag %v", opt.Option)
 		}

config/global_ips.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"strings"
@@ -40,12 +41,12 @@ 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) //nolint: wrapcheck
+				return dialer.DialContext(ctx, network, addr)
 			},
 		},
 	}
 
-	req, err := http.NewRequest(http.MethodGet, ifconfigAddress, nil)
+	req, err := http.NewRequest("GET", ifconfigAddress, nil)
 	if err != nil {
 		return nil, fmt.Errorf("cannot create a request: %w", err)
 	}
@@ -53,7 +54,7 @@ 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(io.Discard, resp.Body) //nolint: errcheck
+			io.Copy(ioutil.Discard, resp.Body) // nolint: errcheck
 		}
 
 		return nil, fmt.Errorf("cannot perform a request: %w", err)
@@ -61,7 +62,7 @@ func fetchIP(ctx context.Context, network string) (net.IP, error) {
 
 	defer resp.Body.Close()
 
-	respDataBytes, err := io.ReadAll(resp.Body)
+	respDataBytes, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response body: %w", err)
 	}

config/urls.go

@@ -8,21 +8,20 @@ import (
 )
 
 type URLs struct {
-	TG        string `json:"tg_url"`     //nolint: tagliatelle
+	TG        string `json:"tg_url"`
-	TMe       string `json:"tme_url"`    //nolint: tagliatelle
+	TMe       string `json:"tme_url"`
-	TGQRCode  string `json:"tg_qrcode"`  //nolint: tagliatelle
+	TGQRCode  string `json:"tg_qrcode"`
-	TMeQRCode string `json:"tme_qrcode"` //nolint: tagliatelle
+	TMeQRCode string `json:"tme_qrcode"`
 }
 
 type IPURLs struct {
-	IPv4      *URLs  `json:"ipv4,omitempty"`
+	IPv4      URLs   `json:"ipv4"`
-	IPv6      *URLs  `json:"ipv6,omitempty"`
+	IPv6      URLs   `json:"ipv6"`
-	BotSecret string `json:"secret_for_mtproxybot"` //nolint: tagliatelle
+	BotSecret string `json:"secret_for_mtproxybot"`
 }
 
-func GetURLs() IPURLs {
+func GetURLs() (urls IPURLs) {
 	secret := ""
-	urls := IPURLs{}
 
 	switch C.SecretMode {
 	case SecretModeSimple:
@@ -33,33 +32,25 @@ func GetURLs() IPURLs {
 		secret = "ee" + hex.EncodeToString(C.Secret) + hex.EncodeToString([]byte(C.CloakHost))
 	}
 
-	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 {
+func makeURLs(addr *net.TCPAddr, secret string) (urls URLs) {
-	urls := &URLs{}
-
 	values := url.Values{}
 	values.Set("server", addr.IP.String())
 	values.Set("port", strconv.Itoa(addr.Port))
 	values.Set("secret", secret)
 
-	return &URLs{
+	urls.TG = makeTGURL(values)
-		TG:        makeTGURL(values),
+	urls.TMe = makeTMeURL(values)
-		TMe:       makeTMeURL(values),
+	urls.TGQRCode = makeQRCodeURL(urls.TG)
-		TGQRCode:  makeQRCodeURL(urls.TG),
+	urls.TMeQRCode = makeQRCodeURL(urls.TG)
-		TMeQRCode: makeQRCodeURL(urls.TMe),
+
-	}
+	return
 }
 
 func makeTGURL(values url.Values) string {

faketls/client_protocol.go

@@ -52,10 +52,10 @@ func (c *ClientProtocol) Handshake(socket conntypes.StreamReadWriteCloser) (conn
 
 	conn, err := c.ClientProtocol.Handshake(conn)
 	if err != nil {
-		return nil, err //nolint: wrapcheck
+		return nil, err
 	}
 
-	return conn, err //nolint: wrapcheck
+	return conn, err
 }
 
 func (c *ClientProtocol) tlsHandshake(conn io.ReadWriter) error {

faketls/cloak.go

@@ -26,7 +26,7 @@ func cloak(one, another io.ReadWriteCloser) {
 	another = rwc.NewPing(ctx, another, channelPing)
 	wg := &sync.WaitGroup{}
 
-	wg.Add(2) //nolint: gomnd
+	wg.Add(2)
 
 	go cloakPipe(one, another, wg)
 
@@ -69,5 +69,5 @@ func cloak(one, another io.ReadWriteCloser) {
 func cloakPipe(one io.Writer, another io.Reader, wg *sync.WaitGroup) {
 	defer wg.Done()
 
-	io.Copy(one, another) //nolint: errcheck
+	io.Copy(one, another) // nolint: errcheck
 }

go.mod

@@ -1,31 +1,22 @@
 module github.com/9seconds/mtg
 
-go 1.18
+go 1.13
 
 require (
-	github.com/VictoriaMetrics/fastcache v1.10.0
+	github.com/VictoriaMetrics/fastcache v1.5.7
-	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137
+	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d
 	github.com/beevik/ntp v0.3.0
-	github.com/golang/snappy v0.0.4 // indirect
+	github.com/prometheus/client_golang v1.7.1
-	github.com/prometheus/client_golang v1.13.0
+	github.com/prometheus/common v0.13.0 // indirect
-	github.com/prometheus/common v0.37.0 // indirect
+	github.com/smira/go-statsd v1.3.1
-	github.com/prometheus/procfs v0.8.0 // indirect
+	go.uber.org/multierr v1.6.0 // indirect
-	github.com/smira/go-statsd v1.3.2
+	go.uber.org/zap v1.16.0
-	go.uber.org/multierr v1.8.0 // indirect
+	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
-	go.uber.org/zap v1.22.0
+	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
-	golang.org/x/crypto v0.0.0-20220722155217-630584e8d5aa
+	golang.org/x/net v0.0.0-20200904194848-62affa334b73 // indirect
-	golang.org/x/net v0.0.0-20220809012201-f428fae20770 // indirect
+	golang.org/x/sys v0.0.0-20200918174421-af09f7315aff
-	golang.org/x/sys v0.0.0-20220808155132-1c4a2a72c664 // indirect
+	golang.org/x/tools v0.0.0-20200319210407-521f4a0cd458 // indirect
-	google.golang.org/protobuf v1.28.1 // indirect
+	google.golang.org/protobuf v1.25.0 // 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
 )

go.sum

@@ -1,512 +1,487 @@
 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=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
-cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
-cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
-cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
-cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
-cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
-cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
-cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
-cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
-cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
-cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
-cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
-github.com/VictoriaMetrics/fastcache v1.10.0 h1:5hDJnLsKLpnUEToub7ETuRu8RCkb40woBZAUiKonXzY=
+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
-github.com/VictoriaMetrics/fastcache v1.10.0/go.mod h1:tjiYeEfYXCqacuvYw/7UoDIeJaNxq6132xHICNP77w8=
+github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
+github.com/VictoriaMetrics/fastcache v1.5.7 h1:4y6y0G8PRzszQUYIQHHssv/jgPHAb5qQuuDNdCbyAgw=
+github.com/VictoriaMetrics/fastcache v1.5.7/go.mod h1:ptDBkNMQI4RtmVo8VS/XwRY6RoTu1dAWCbrk+6WsEM8=
+github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
+github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc h1:cAKDfWh5VpdgMhJosfJnn5/FoN2SRZ4p7fJNX58YPaU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf h1:qet1QNfXsQxTZqLG4oE62mJzwPIB8+Tee4RNCL9ulrY=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4 h1:Hs82Z41s6SdL1CELW+XaDYmOH4hkBN4/N9og/AsOv7E=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
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hub/connection.go

@@ -30,7 +30,7 @@ type connection struct {
 	channelConnDetach chan conntypes.ConnID
 }
 
-func (c *connection) run() { //nolint: cyclop
+func (c *connection) run() {
 	defer c.Close()
 
 	ttl := time.NewTimer(connectionTTL)
@@ -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,

hub/hub.go

@@ -18,7 +18,7 @@ func (h *hub) Register(req *protocol.TelegramRequest) (*ProxyConn, error) {
 }
 
 func (h *hub) getMux(req *protocol.TelegramRequest) *mux {
-	key := 32767 + int32(req.ClientProtocol.DC()) + 100000*int32(req.ClientProtocol.ConnectionProtocol()) //nolint: gomnd
+	var key int32 = 32767 + int32(req.ClientProtocol.DC()) + 100000*int32(req.ClientProtocol.ConnectionProtocol())
 
 	h.mutex.RLock()
 	m, ok := h.muxes[key]

main.go

@@ -3,13 +3,18 @@ package main
 import (
 	"math/rand"
 	"os"
+	"runtime/debug"
+	"strings"
 	"time"
 
 	"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.")
 
@@ -123,6 +128,10 @@ 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)
@@ -157,3 +166,25 @@ 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()
+}

mtproto/protocol.go

@@ -51,7 +51,7 @@ func doRPCNonceRequest(conn conntypes.BasePacketWriter) (*rpc.NonceRequest, erro
 	}
 
 	if err := conn.Write(rpcNonceReq.Bytes()); err != nil {
-		return nil, err //nolint: wrapcheck
+		return nil, err
 	}
 
 	return rpcNonceReq, nil

mtproto/rpc/handshake_response.go

@@ -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 { //nolint: gomnd
+	if len(data) != 32 {
 		return nil, fmt.Errorf("incorrect handshake response length %d", len(data))
 	}
 

mtproto/rpc/nonce_request.go

@@ -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)      //nolint: gomnd
+	nonce := make([]byte, 16)
-	keySelector := make([]byte, 4) //nolint: gomnd
+	keySelector := make([]byte, 4)
-	cryptoTS := make([]byte, 4)    //nolint: gomnd
+	cryptoTS := make([]byte, 4)
 
 	if _, err := rand.Read(nonce); err != nil {
 		return nil, fmt.Errorf("cannot generate nonce: %w", err)
 	}
 
 	copy(keySelector, proxySecret)
-	// 256 ^ 4 - do not know how to name
+
-	timestamp := time.Now().Truncate(time.Second).Unix() % 4294967296 //nolint: gomnd
+	timestamp := time.Now().Truncate(time.Second).Unix() % 4294967296 // 256 ^ 4 - do not know how to name
 	binary.LittleEndian.PutUint32(cryptoTS, uint32(timestamp))
 
 	return &NonceRequest{

mtproto/rpc/nonce_response.go

@@ -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 { //nolint: gomnd
+	if len(data) != 32 {
 		return nil, fmt.Errorf("unexpected message length %d", len(data))
 	}
 

mtproto/rpc/proxy_flags.go

@@ -21,14 +21,14 @@ const (
 var ProxyRequestFlagsEncryptedPrefix [8]byte
 
 func (r ProxyRequestFlags) Bytes() []byte {
-	converted := make([]byte, 4) //nolint: gomnd
+	converted := make([]byte, 4)
 	binary.LittleEndian.PutUint32(converted, uint32(r))
 
 	return converted
 }
 
 func (r ProxyRequestFlags) String() string {
-	flags := make([]string, 0, 7) //nolint: gomnd
+	flags := make([]string, 0, 7)
 
 	if r&ProxyRequestFlagsHasAdTag != 0 {
 		flags = append(flags, "HAS_AD_TAG")

mtproto/rpc/proxy_response.go

@@ -24,7 +24,7 @@ type ProxyResponse struct {
 func ParseProxyResponse(packet conntypes.Packet) (*ProxyResponse, error) {
 	var response ProxyResponse
 
-	if len(packet) < 4 { //nolint: gomnd
+	if len(packet) < 4 {
 		return nil, fmt.Errorf("incorrect packet length: %d", len(packet))
 	}
 

ntp/ntp.go

@@ -14,7 +14,7 @@ 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))] //nolint: gosec
+	url := config.C.NTPServers[rand.Intn(len(config.C.NTPServers))] // nolint: gosec
 
 	resp, err := ntp.Query(url)
 	if err != nil {

obfuscated2/client_protocol.go

@@ -45,14 +45,14 @@ func (c *ClientProtocol) Handshake(socket conntypes.StreamReadWriteCloser) (conn
 	}
 
 	decHasher := sha256.New()
-	decHasher.Write(fm.Key())
+	decHasher.Write(fm.Key())        // nolint: errcheck
-	decHasher.Write(config.C.Secret)
+	decHasher.Write(config.C.Secret) // nolint: errcheck
 	decryptor := utils.MakeStreamCipher(decHasher.Sum(nil), fm.IV())
 
 	invertedFrame := fm.Invert()
 	encHasher := sha256.New()
-	encHasher.Write(invertedFrame.Key())
+	encHasher.Write(invertedFrame.Key()) // nolint: errcheck
-	encHasher.Write(config.C.Secret)
+	encHasher.Write(config.C.Secret)     // nolint: errcheck
 	encryptor := utils.MakeStreamCipher(encHasher.Sum(nil), invertedFrame.IV())
 
 	decryptedFrame := Frame{}
@@ -93,14 +93,12 @@ func (c *ClientProtocol) Handshake(socket conntypes.StreamReadWriteCloser) (conn
 	return stream.NewObfuscated2(socket, encryptor, decryptor), nil
 }
 
-func (c *ClientProtocol) ReadFrame(socket conntypes.StreamReader) (Frame, error) {
+func (c *ClientProtocol) ReadFrame(socket conntypes.StreamReader) (fm Frame, err error) {
-	fm := Frame{}
+	if _, err = io.ReadFull(handshakeReader{socket}, fm.Bytes()); err != nil {
-
+		err = fmt.Errorf("cannot extract obfuscated2 frame: %w", err)
-	if _, err := io.ReadFull(handshakeReader{socket}, fm.Bytes()); err != nil {
-		return fm, fmt.Errorf("cannot extract obfuscated2 frame: %w", err)
 	}
 
-	return fm, nil
+	return
 }
 
 type handshakeReader struct {
@@ -108,7 +106,7 @@ type handshakeReader struct {
 }
 
 func (h handshakeReader) Read(p []byte) (int, error) {
-	return h.parent.ReadTimeout(p, clientProtocolHandshakeTimeout) //nolint: wrapcheck
+	return h.parent.ReadTimeout(p, clientProtocolHandshakeTimeout)
 }
 
 func MakeClientProtocol() protocol.ClientProtocol {

obfuscated2/frame.go

@@ -44,11 +44,11 @@ func (f *Frame) Unique() []byte {
 	return f.data[frameOffsetFirst:frameOffsetDC]
 }
 
-func (f *Frame) Invert() Frame {
+func (f *Frame) Invert() (nf Frame) {
-	nf := *f
+	nf = *f
 	for i := 0; i < frameLenKey+frameLenIV; i++ {
 		nf.data[frameOffsetFirst+i] = f.data[frameOffsetIV-1-i]
 	}
 
-	return nf
+	return
 }

obfuscated2/telegram_protocol.go

@@ -39,8 +39,7 @@ func TelegramProtocol(req *protocol.TelegramRequest) (conntypes.StreamReadWriteC
 	return stream.NewObfuscated2(conn, encryptor, decryptor), nil
 }
 
-func generateFrame(cp protocol.ClientProtocol) Frame {
+func generateFrame(cp protocol.ClientProtocol) (fm Frame) {
-	fm := Frame{}
 	data := fm.Bytes()
 
 	for {
@@ -48,22 +47,22 @@ func generateFrame(cp protocol.ClientProtocol) Frame {
 			continue
 		}
 
-		if data[0] == 0xef { //nolint: gomnd
+		if data[0] == 0xef {
 			continue
 		}
 
-		val := (uint32(data[3]) << 24) | (uint32(data[2]) << 16) | (uint32(data[1]) << 8) | uint32(data[0])        //nolint: gomnd, lll
+		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 { //nolint: lll
+		if val == 0x44414548 || val == 0x54534f50 || val == 0x20544547 || val == 0x4954504f || val == 0xeeeeeeee {
 			continue
 		}
 
-		val = (uint32(data[7]) << 24) | (uint32(data[6]) << 16) | (uint32(data[5]) << 8) | uint32(data[4]) //nolint: gomnd
+		val = (uint32(data[7]) << 24) | (uint32(data[6]) << 16) | (uint32(data[5]) << 8) | uint32(data[4])
-		if val == 0x00000000 {                                                                             //nolint: gomnd
+		if val == 0x00000000 {
 			continue
 		}
 
 		copy(fm.Magic(), cp.ConnectionType().Tag())
 
-		return fm
+		return
 	}
 }

proxy/direct.go

@@ -4,6 +4,7 @@ import (
 	"io"
 	"sync"
 
+	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/obfuscated2"
 	"github.com/9seconds/mtg/protocol"
 	"go.uber.org/zap"
@@ -14,17 +15,19 @@ const directPipeBufferSize = 1024
 func directConnection(request *protocol.TelegramRequest) error {
 	telegramConnRaw, err := obfuscated2.TelegramProtocol(request)
 	if err != nil {
-		return err //nolint: wrapcheck
+		return err
 	}
 
-	defer telegramConnRaw.Close()
+	telegramConn := telegramConnRaw.(conntypes.StreamReadWriteCloser)
+
+	defer telegramConn.Close()
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2) //nolint: gomnd
+	wg.Add(2)
 
-	go directPipe(telegramConnRaw, request.ClientConn, wg, request.Logger)
+	go directPipe(telegramConn, request.ClientConn, wg, request.Logger)
 
-	go directPipe(request.ClientConn, telegramConnRaw, wg, request.Logger)
+	go directPipe(request.ClientConn, telegramConn, wg, request.Logger)
 
 	wg.Wait()
 

proxy/middle.go

@@ -32,7 +32,7 @@ func middleConnection(request *protocol.TelegramRequest) {
 	}
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2) //nolint: gomnd
+	wg.Add(2)
 
 	go middlePipe(telegramConn, clientConn, wg, request.Logger)
 
@@ -44,8 +44,7 @@ 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()

stats/stats.go

@@ -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)

stats/stats_prometheus.go

@@ -39,8 +39,7 @@ 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",

stats/stats_statsd.go

@@ -83,7 +83,7 @@ func (s *statsStatsd) ClientDisconnected(connectionType conntypes.ConnectionType
 }
 
 func (s *statsStatsd) changeConnections(connectionType conntypes.ConnectionType, addr *net.TCPAddr, increment int64) {
-	tags := make([]*statsStatsdTag, 0, 2) //nolint: gomnd
+	tags := make([]*statsStatsdTag, 0, 2)
 
 	switch connectionType {
 	case conntypes.ConnectionTypeAbridged:
@@ -168,18 +168,17 @@ func (s *statsStatsd) prepareVals(metric string, tags []*statsStatsdTag) (string
 
 func (s *statsStatsd) initGauge(metric, key string, tags []statsd.Tag) {
 	s.seenMutex.RLock()
-	if _, ok := s.seen[key]; ok {
+	_, ok := s.seen[key]
 	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...)
 	}
@@ -194,8 +193,8 @@ func newStatsStatsd() Interface {
 	return &statsStatsd{
 		seen: make(map[string]struct{}),
 		client: statsd.NewClient(config.C.StatsdAddr.String(),
-			statsd.SendLoopCount(2),                  //nolint: gomnd
+			statsd.SendLoopCount(2),
-			statsd.ReconnectInterval(10*time.Second), //nolint: gomnd
+			statsd.ReconnectInterval(10*time.Second),
 			statsd.Logger(logger),
 			statsd.MetricPrefix(prefix),
 			statsd.TagStyle(config.C.StatsdTagsFormat),

telegram/api/addresses.go

@@ -12,8 +12,8 @@ import (
 )
 
 const (
-	addressesURLV4 = "https://core.telegram.org/getProxyConfig"   //nolint: gas
+	addressesURLV4 = "https://core.telegram.org/getProxyConfig"   // nolint: gas
-	addressesURLV6 = "https://core.telegram.org/getProxyConfigV6" //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) //nolint: gomnd
+	chunks := addressesProxyForSplitter.Split(text, 3)
 	if len(chunks) != 3 || chunks[0] != "proxy_for" {
 		return "", 0, fmt.Errorf("incorrect config %s", text)
 	}
 
-	dc, err := strconv.ParseInt(chunks[1], 10, 16) //nolint: gomnd
+	dc, err := strconv.ParseInt(chunks[1], 10, 16)
 	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) //nolint: gomnd
+	chunks := addressesProxyForSplitter.Split(text, 2)
 	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) //nolint: gomnd
+	dc, err := strconv.ParseInt(dcString, 10, 16)
 	if err != nil {
 		return 0, fmt.Errorf("incorrect config '%s': %w", text, err)
 	}

telegram/api/api.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net/http"
 	"time"
 )
@@ -21,7 +22,7 @@ func request(url string) (io.ReadCloser, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), apiHTTPTimeout)
 	defer cancel()
 
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
 	if err != nil {
 		panic(err)
 	}
@@ -32,12 +33,12 @@ func request(url string) (io.ReadCloser, error) {
 	resp, err := httpClient.Do(req)
 	if err != nil {
 		if resp != nil {
-			io.Copy(io.Discard, resp.Body) //nolint: errcheck
+			io.Copy(ioutil.Discard, resp.Body) // nolint: errcheck
 			resp.Body.Close()
 		}
 
 		return nil, fmt.Errorf("cannot perform a request: %w", err)
 	}
 
-	return resp.Body, err //nolint: wrapcheck
+	return resp.Body, err
 }

telegram/api/secret.go

@@ -2,10 +2,10 @@ package api
 
 import (
 	"fmt"
-	"io"
+	"io/ioutil"
 )
 
-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 := io.ReadAll(resp)
+	secret, err := ioutil.ReadAll(resp)
 	if err != nil {
 		return nil, fmt.Errorf("cannot read response: %w", err)
 	}

telegram/base.go

@@ -28,8 +28,7 @@ func (b *baseTelegram) Secret() []byte {
 }
 
 func (b *baseTelegram) dial(dc conntypes.DC,
-	protocol conntypes.ConnectionProtocol,
+	protocol conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error) {
-) (conntypes.StreamReadWriteCloser, error) {
 	for _, addr := range b.getAddresses(dc, protocol) {
 		conn, err := b.dialer.Dial("tcp", addr)
 		if err != nil {
@@ -51,7 +50,7 @@ func (b *baseTelegram) dial(dc conntypes.DC,
 }
 
 func (b *baseTelegram) getAddresses(dc conntypes.DC, protocol conntypes.ConnectionProtocol) []string {
-	addresses := make([]string, 0, 2) //nolint: gomnd
+	addresses := make([]string, 0, 2)
 	protos := []conntypes.ConnectionProtocol{
 		conntypes.ConnectionProtocolIPv6,
 		conntypes.ConnectionProtocolIPv4,
@@ -75,8 +74,7 @@ func (b *baseTelegram) getAddresses(dc conntypes.DC, protocol conntypes.Connecti
 }
 
 func (b *baseTelegram) chooseAddress(addresses map[conntypes.DC][]string,
-	dc, defaultDC conntypes.DC,
+	dc, defaultDC conntypes.DC) string {
-) string {
 	addrs, ok := addresses[dc]
 	if !ok {
 		addrs = addresses[defaultDC]
@@ -86,7 +84,7 @@ 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))] //nolint: gosec
+		return addrs[rand.Intn(len(addrs))] // nolint: gosec
 	}
 
 	return ""

telegram/direct.go

@@ -29,8 +29,7 @@ type directTelegram struct {
 }
 
 func (d *directTelegram) Dial(dc conntypes.DC,
-	protocol conntypes.ConnectionProtocol,
+	protocol conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error) {
-) (conntypes.StreamReadWriteCloser, error) {
 	switch {
 	case dc < 0:
 		dc = -dc

telegram/middle.go

@@ -63,8 +63,7 @@ func (m *middleTelegram) backgroundUpdate() {
 }
 
 func (m *middleTelegram) Dial(dc conntypes.DC,
-	protocol conntypes.ConnectionProtocol,
+	protocol conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error) {
-) (conntypes.StreamReadWriteCloser, error) {
 	if dc == 0 {
 		dc = conntypes.DCDefaultIdx
 	}

tlstypes/consts.go

@@ -20,22 +20,22 @@ const (
 type CipherSuiteType uint8
 
 const (
-	CipherSuiteType_TLS_AES_128_GCM_SHA256       CipherSuiteType = iota //nolint: stylecheck,golint,revive,nosnakecase
+	CipherSuiteType_TLS_AES_128_GCM_SHA256       CipherSuiteType = iota // nolint: stylecheck,golint
-	CipherSuiteType_TLS_AES_256_GCM_SHA384                              //nolint: stylecheck,golint,revive,nosnakecase
+	CipherSuiteType_TLS_AES_256_GCM_SHA384                              // nolint: stylecheck,golint
-	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256                        //nolint: stylecheck,golint,revive,nosnakecase
+	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256                        // nolint: stylecheck,golint
 )
 
 func (c CipherSuiteType) Bytes() []byte {
 	switch c {
-	case CipherSuiteType_TLS_AES_128_GCM_SHA256: //nolint: nosnakecase
+	case CipherSuiteType_TLS_AES_128_GCM_SHA256:
-		return CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes //nolint: nosnakecase
+		return CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes
-	case CipherSuiteType_TLS_AES_256_GCM_SHA384: //nolint: nosnakecase
+	case CipherSuiteType_TLS_AES_256_GCM_SHA384:
-		return CipherSuiteType_TLS_AES_256_GCM_SHA384_Bytes //nolint: nosnakecase
+		return CipherSuiteType_TLS_AES_256_GCM_SHA384_Bytes
-	case CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256: //nolint: nosnakecase
+	case CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256:
-		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
+	return CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes
 }
 
 type Version uint8
@@ -69,9 +69,9 @@ var (
 	Version12Bytes = []byte{0x03, 0x03}
 	Version13Bytes = []byte{0x03, 0x04}
 
-	CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes       = []byte{0x13, 0x01} //nolint: stylecheck,golint,revive,nosnakecase
+	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,revive,nosnakecase
+	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,revive,nosnakecase
+	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes = []byte{0x13, 0x03} // nolint: stylecheck,golint
 )
 
 type Byter interface {
@@ -82,7 +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 {

tlstypes/handshake.go

@@ -18,7 +18,7 @@ type Handshake struct {
 func (h *Handshake) WriteBytes(writer io.Writer) {
 	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[:])
@@ -30,8 +30,8 @@ func (h *Handshake) WriteBytes(writer io.Writer) {
 	sizeUint24Bytes := sizeUint24[:]
 	sizeUint24Bytes[0], sizeUint24Bytes[2] = sizeUint24Bytes[2], sizeUint24Bytes[0]
 
-	writer.Write(sizeUint24Bytes) //nolint: errcheck
+	writer.Write(sizeUint24Bytes) // nolint: errcheck
-	packetBuf.WriteTo(writer)     //nolint: errcheck
+	packetBuf.WriteTo(writer)     // nolint: errcheck
 }
 
 func (h *Handshake) Len() int {

tlstypes/record.go

@@ -16,9 +16,9 @@ type Record struct {
 }
 
 func (r Record) WriteBytes(writer io.Writer) {
-	writer.Write([]byte{byte(r.Type)})                           //nolint: errcheck
+	writer.Write([]byte{byte(r.Type)})                           // nolint: errcheck
-	writer.Write(r.Version.Bytes())                              //nolint: errcheck
+	writer.Write(r.Version.Bytes())                              // nolint: errcheck
-	binary.Write(writer, binary.BigEndian, uint16(r.Data.Len())) //nolint: errcheck
+	binary.Write(writer, binary.BigEndian, uint16(r.Data.Len())) // nolint: errcheck
 	r.Data.WriteBytes(writer)
 }
 
@@ -65,9 +65,7 @@ func ReadRecord(reader io.Reader) (Record, error) {
 	return rec, nil
 }
 
-func MakeRecords(raw []byte) []Record {
+func MakeRecords(raw []byte) (arr []Record) {
-	var arr []Record
-
 	for len(raw) > 0 {
 		chunkSize := recordMaxChunkSize
 		if chunkSize > len(raw) {
@@ -82,5 +80,5 @@ func MakeRecords(raw []byte) []Record {
 		raw = raw[chunkSize:]
 	}
 
-	return arr
+	return
 }

tlstypes/server_hello.go

@@ -36,8 +36,8 @@ func (s ServerHello) WelcomePacket() []byte {
 	}
 	recChangeCipher.WriteBytes(buf)
 
-	hostCert := make([]byte, 1024+mrand.Intn(3092)) //nolint: gosec, gomnd
+	hostCert := make([]byte, 1024+mrand.Intn(3092)) // nolint: gosec
-	rand.Read(hostCert)                             //nolint: errcheck
+	rand.Read(hostCert)                             // nolint: errcheck
 
 	recData := Record{
 		Type:    RecordTypeApplicationData,
@@ -49,8 +49,8 @@ func (s ServerHello) WelcomePacket() []byte {
 	packet := buf.Bytes()
 
 	mac := hmac.New(sha256.New, config.C.Secret)
-	mac.Write(s.clientHello.Random[:])
+	mac.Write(s.clientHello.Random[:]) // nolint: errcheck
-	mac.Write(packet)
+	mac.Write(packet)                  // nolint: errcheck
 	copy(packet[11:], mac.Sum(nil))
 
 	return packet
@@ -66,8 +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) //nolint: nosnakecase
+	tail := bytes.NewBuffer(CipherSuiteType_TLS_AES_128_GCM_SHA256_Bytes)
-	tail.WriteByte(0x00)                                                  //nolint: gomnd // no compression
+	tail.WriteByte(0x00) // no compression
 	makeTLSExtensions(tail)
 	rv.Tail = RawBytes(tail.Bytes())
 
@@ -75,7 +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
@@ -85,11 +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

utils/init_tcp.go

@@ -5,8 +5,8 @@ import (
 	"net"
 )
 
-func InitTCP(conn net.Conn, readBufferSize, writeBufferSize int) error {
+func InitTCP(conn net.Conn, readBufferSize int, writeBufferSize int) error {
-	tcpConn := conn.(*net.TCPConn) //nolint: forcetypeassert
+	tcpConn := conn.(*net.TCPConn)
 
 	if err := tcpConn.SetNoDelay(true); err != nil {
 		return fmt.Errorf("cannot set TCP_NO_DELAY: %w", err)

utils/read_full.go

@@ -4,15 +4,14 @@ import "io"
 
 const readFullBufferSize = 1024 + 1 // +1 because telegram opreates with blocks mod 4
 
-func ReadFull(src io.Reader) ([]byte, error) {
+func ReadFull(src io.Reader) (rv []byte, err 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 //nolint: wrapcheck
+			return nil, err
 		}
 
 		rv = append(rv, buf[:n]...)

utils/reverse_bytes.go

@@ -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-- { //nolint: gomnd
+	for i := dataLen/2 - 1; i >= 0; i-- {
 		opp := dataLen - i - 1
 		rv[i], rv[opp] = data[opp], data[i]
 	}

utils/rlimit.go

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

utils/rlimit_windows.go

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

utils/signal_context.go

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

utils/signal_context_windows.go

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

utils/uint24.go

@@ -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)} //nolint: gomnd
+	return Uint24{byte(number), byte(number >> 8), byte(number >> 16)}
 }
 
 func FromUint24(number Uint24) uint32 {
-	return uint32(number[0]) + (uint32(number[1]) << 8) + (uint32(number[2]) << 16) //nolint: gomnd
+	return uint32(number[0]) + (uint32(number[1]) << 8) + (uint32(number[2]) << 16)
 }

wrappers/packet/mtproto_frame.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"hash/crc32"
 	"io"
+	"io/ioutil"
 	"net"
 
 	"github.com/9seconds/mtg/conntypes"
@@ -27,13 +28,10 @@ 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.
-//
 // 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
 type wrapperMtprotoFrame struct {
 	parent     conntypes.StreamReadWriteCloser
@@ -42,7 +40,7 @@ type wrapperMtprotoFrame struct {
 	writeSeqNo int32
 }
 
-func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { //nolint: funlen, cyclop
+func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funlen
 	buf := &bytes.Buffer{}
 
 	sum := crc32.NewIEEE()
@@ -52,7 +50,7 @@ func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { //nolint: funle
 		buf.Reset()
 		sum.Reset()
 
-		if _, err := io.CopyN(writer, w.parent, 4); err != nil { //nolint: gomnd
+		if _, err := io.CopyN(writer, w.parent, 4); err != nil {
 			return nil, fmt.Errorf("cannot read frame padding: %w", err)
 		}
 
@@ -74,23 +72,23 @@ func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { //nolint: funle
 
 	buf.Reset()
 
-	if _, err := io.CopyN(writer, w.parent, int64(messageLength)-4-4); err != nil { //nolint: gomnd
+	if _, err := io.CopyN(writer, w.parent, int64(messageLength)-4-4); err != nil {
 		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, _ := io.ReadAll(buf)
+	data, _ := ioutil.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 { //nolint: gomnd
+	if _, err := io.CopyN(buf, w.parent, 4); err != nil {
 		return nil, fmt.Errorf("cannot read checksum: %w", err)
 	}
 
@@ -111,18 +109,18 @@ func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { //nolint: funle
 }
 
 func (w *wrapperMtprotoFrame) Write(p conntypes.Packet) error {
-	messageLength := 4 + 4 + len(p) + 4 //nolint: gomnd
+	messageLength := 4 + 4 + len(p) + 4
 	paddingLength := (aes.BlockSize - messageLength%aes.BlockSize) % aes.BlockSize
 
 	buf := &bytes.Buffer{}
 
-	binary.Write(buf, binary.LittleEndian, uint32(messageLength)) //nolint: errcheck
+	binary.Write(buf, binary.LittleEndian, uint32(messageLength)) // nolint: errcheck
-	binary.Write(buf, binary.LittleEndian, w.writeSeqNo)          //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
+	binary.Write(buf, binary.LittleEndian, checksum) // nolint: errcheck
-	buf.Write(bytes.Repeat(mtprotoFramePadding, paddingLength/4)) //nolint: gomnd
+	buf.Write(bytes.Repeat(mtprotoFramePadding, paddingLength/4))
 
 	w.logger.Debugw("Write MTProto frame",
 		"length", len(p),
@@ -134,11 +132,11 @@ func (w *wrapperMtprotoFrame) Write(p conntypes.Packet) error {
 
 	_, err := w.parent.Write(buf.Bytes())
 
-	return err //nolint: wrapcheck
+	return err
 }
 
 func (w *wrapperMtprotoFrame) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func (w *wrapperMtprotoFrame) Conn() net.Conn {

wrappers/packetack/client_abridged.go

@@ -39,9 +39,9 @@ func (w *wrapperClientAbridged) Read(acks *conntypes.ConnectionAcks) (conntypes.
 	}
 
 	if msgLength == clientAbridgedSmallPacketLength {
-		buf.Grow(3) //nolint: gomnd
+		buf.Grow(3)
 
-		if _, err := io.CopyN(&buf, w.parent, 3); err != nil { //nolint: gomnd
+		if _, err := io.CopyN(&buf, w.parent, 3); err != nil {
 			return nil, fmt.Errorf("cannot read correct message length: %w", err)
 		}
 
@@ -75,7 +75,7 @@ func (w *wrapperClientAbridged) Write(packet conntypes.Packet, acks *conntypes.C
 		return nil
 	}
 
-	packetLength := len(packet) / 4 //nolint: gomnd
+	packetLength := len(packet) / 4
 
 	switch {
 	case packetLength < clientAbridgedSmallPacketLength:
@@ -104,7 +104,7 @@ func (w *wrapperClientAbridged) Write(packet conntypes.Packet, acks *conntypes.C
 }
 
 func (w *wrapperClientAbridged) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func (w *wrapperClientAbridged) Conn() net.Conn {

wrappers/packetack/client_intermediate.go

@@ -20,9 +20,9 @@ type wrapperClientIntermediate struct {
 func (w *wrapperClientIntermediate) Read(acks *conntypes.ConnectionAcks) (conntypes.Packet, error) {
 	buf := bytes.Buffer{}
 
-	buf.Grow(4) //nolint: gomnd
+	buf.Grow(4)
 
-	if _, err := io.CopyN(&buf, w.parent, 4); err != nil { //nolint: gomnd
+	if _, err := io.CopyN(&buf, w.parent, 4); err != nil {
 		return nil, fmt.Errorf("cannot read message length: %w", err)
 	}
 
@@ -63,7 +63,7 @@ func (w *wrapperClientIntermediate) Write(packet conntypes.Packet, acks *conntyp
 }
 
 func (w *wrapperClientIntermediate) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func (w *wrapperClientIntermediate) Conn() net.Conn {

wrappers/packetack/client_intermediate_secure.go

@@ -20,7 +20,7 @@ func (w *wrapperClientIntermediateSecure) Read(acks *conntypes.ConnectionAcks) (
 		return nil, err
 	}
 
-	length := len(data) - (len(data) % 4) //nolint: gomnd
+	length := len(data) - (len(data) % 4)
 
 	return data[:length], nil
 }
@@ -35,11 +35,11 @@ func (w *wrapperClientIntermediateSecure) Write(packet conntypes.Packet, acks *c
 	}
 
 	buf := &bytes.Buffer{}
-	paddingLength := rand.Intn(4) //nolint: gosec, gomnd
+	paddingLength := rand.Intn(4) // nolint: gosec
 
 	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))
 

wrappers/packetack/proxy.go

@@ -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)) //nolint: gomnd
+	buf.Write(make([]byte, (4-buf.Len()%4)%4))
 	buf.Grow(len(packet))
 	buf.Write(packet)
 
-	return w.proxy.Write(buf.Bytes()) //nolint: wrapcheck
+	return w.proxy.Write(buf.Bytes())
 }
 
 func (w *wrapperProxy) Read(acks *conntypes.ConnectionAcks) (conntypes.Packet, error) {

wrappers/rwc/ping.go

@@ -20,7 +20,7 @@ func (w *wrapperPing) Read(p []byte) (int, error) {
 		}
 	}
 
-	return n, err //nolint: wrapcheck
+	return n, err
 }
 
 func (w *wrapperPing) Write(p []byte) (int, error) {
@@ -32,11 +32,11 @@ func (w *wrapperPing) Write(p []byte) (int, error) {
 		}
 	}
 
-	return n, err //nolint: wrapcheck
+	return n, err
 }
 
 func (w *wrapperPing) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func NewPing(ctx context.Context, parent io.ReadWriteCloser, channelPing chan<- struct{}) io.ReadWriteCloser {

wrappers/stream/blockcipher.go

@@ -26,7 +26,7 @@ func (w *wrapperBlockCipher) Write(p []byte) (int, error) {
 		return 0, err
 	}
 
-	return w.parent.Write(encrypted) //nolint: wrapcheck
+	return w.parent.Write(encrypted)
 }
 
 func (w *wrapperBlockCipher) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
@@ -35,7 +35,7 @@ func (w *wrapperBlockCipher) WriteTimeout(p []byte, timeout time.Duration) (int,
 		return 0, err
 	}
 
-	return w.parent.WriteTimeout(encrypted, timeout) //nolint: wrapcheck
+	return w.parent.WriteTimeout(encrypted, timeout)
 }
 
 func (w *wrapperBlockCipher) encrypt(p []byte) ([]byte, error) {
@@ -50,7 +50,7 @@ func (w *wrapperBlockCipher) encrypt(p []byte) ([]byte, error) {
 }
 
 func (w *wrapperBlockCipher) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func (w *wrapperBlockCipher) Conn() net.Conn {
@@ -70,8 +70,7 @@ func (w *wrapperBlockCipher) RemoteAddr() *net.TCPAddr {
 }
 
 func newBlockCipher(parent conntypes.StreamReadWriteCloser,
-	encryptor, decryptor cipher.BlockMode,
+	encryptor, decryptor cipher.BlockMode) conntypes.StreamReadWriteCloser {
-) conntypes.StreamReadWriteCloser {
 	cipher := &wrapperBlockCipher{
 		parent:    parent,
 		encryptor: encryptor,

wrappers/stream/buffered_reader.go

@@ -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) //nolint: wrapcheck
+		return b.buf.Read(p)
 	}
 
 	sizeToReturn := b.buf.Len()

wrappers/stream/conn.go

@@ -43,7 +43,7 @@ func (w *wrapperConn) Write(p []byte) (int, error) {
 		w.Close()
 	}
 
-	return n, err //nolint: wrapcheck
+	return n, err
 }
 
 func (w *wrapperConn) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
@@ -64,13 +64,13 @@ func (w *wrapperConn) Read(p []byte) (int, error) {
 		w.Close()
 	}
 
-	return n, err //nolint: wrapcheck
+	return n, err
 }
 
 func (w *wrapperConn) Close() error {
 	w.logger.Debugw("Close connection")
 
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func (w *wrapperConn) Conn() net.Conn {
@@ -91,11 +91,10 @@ func (w *wrapperConn) RemoteAddr() *net.TCPAddr {
 
 func newConn(parent net.Conn,
 	connID conntypes.ConnID,
-	purpose connPurpose,
+	purpose connPurpose) conntypes.StreamReadWriteCloser {
-) conntypes.StreamReadWriteCloser {
+	localAddr := *parent.LocalAddr().(*net.TCPAddr)
-	localAddr := *parent.LocalAddr().(*net.TCPAddr) //nolint: forcetypeassert
 
-	if parent.RemoteAddr().(*net.TCPAddr).IP.To4() != nil { //nolint: forcetypeassert
+	if parent.RemoteAddr().(*net.TCPAddr).IP.To4() != nil {
 		if config.C.PublicIPv4.IP != nil {
 			localAddr.IP = config.C.PublicIPv4.IP
 		}
@@ -118,7 +117,7 @@ func newConn(parent net.Conn,
 		parent:     parent,
 		connID:     connID,
 		logger:     logger,
-		remoteAddr: parent.RemoteAddr().(*net.TCPAddr), //nolint: forcetypeassert
+		remoteAddr: parent.RemoteAddr().(*net.TCPAddr),
 		localAddr:  &localAddr,
 	}
 }

wrappers/stream/ctx.go

@@ -23,7 +23,7 @@ func (w *wrapperCtx) WriteTimeout(p []byte, timeout time.Duration) (int, error)
 
 		return 0, fmt.Errorf("cannot write because context was closed: %w", w.ctx.Err())
 	default:
-		return w.parent.WriteTimeout(p, timeout) //nolint: wrapcheck
+		return w.parent.WriteTimeout(p, timeout)
 	}
 }
 
@@ -34,7 +34,7 @@ func (w *wrapperCtx) Write(p []byte) (int, error) {
 
 		return 0, fmt.Errorf("cannot write because context was closed: %w", w.ctx.Err())
 	default:
-		return w.parent.Write(p) //nolint: wrapcheck
+		return w.parent.Write(p)
 	}
 }
 
@@ -45,7 +45,7 @@ func (w *wrapperCtx) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
 
 		return 0, fmt.Errorf("cannot write because context was closed: %w", w.ctx.Err())
 	default:
-		return w.parent.ReadTimeout(p, timeout) //nolint: wrapcheck
+		return w.parent.ReadTimeout(p, timeout)
 	}
 }
 
@@ -56,14 +56,14 @@ func (w *wrapperCtx) Read(p []byte) (int, error) {
 
 		return 0, fmt.Errorf("cannot write because context was closed: %w", w.ctx.Err())
 	default:
-		return w.parent.Read(p) //nolint: wrapcheck
+		return w.parent.Read(p)
 	}
 }
 
 func (w *wrapperCtx) Close() error {
 	w.cancel()
 
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func (w *wrapperCtx) Conn() net.Conn {
@@ -84,8 +84,7 @@ func (w *wrapperCtx) RemoteAddr() *net.TCPAddr {
 
 func NewCtx(ctx context.Context,
 	cancel context.CancelFunc,
-	parent conntypes.StreamReadWriteCloser,
+	parent conntypes.StreamReadWriteCloser) conntypes.StreamReadWriteCloser {
-) conntypes.StreamReadWriteCloser {
 	return &wrapperCtx{
 		parent: parent,
 		ctx:    ctx,

wrappers/stream/faketls.go

@@ -20,7 +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) //nolint: wrapcheck
+		return w.parent.Write(b)
 	})
 }
 
@@ -30,7 +30,7 @@ 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) //nolint: wrapcheck
+			return w.parent.WriteTimeout(b, timeout-elapsed)
 		}
 
 		return 0, errors.New("timeout")
@@ -73,7 +73,7 @@ func (w *wrapperFakeTLS) RemoteAddr() *net.TCPAddr {
 }
 
 func (w *wrapperFakeTLS) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func NewFakeTLS(socket conntypes.StreamReadWriteCloser) conntypes.StreamReadWriteCloser {
@@ -85,7 +85,7 @@ func NewFakeTLS(socket conntypes.StreamReadWriteCloser) conntypes.StreamReadWrit
 		for {
 			rec, err := tlstypes.ReadRecord(faketls.parent)
 			if err != nil {
-				return nil, err //nolint: wrapcheck
+				return nil, err
 			}
 
 			switch rec.Type {

wrappers/stream/mtproto_cipher.go

@@ -26,8 +26,7 @@ var mtprotoEmptyIP = [4]byte{0x00, 0x00, 0x00, 0x00}
 func NewMiddleProxyCipher(parent conntypes.StreamReadWriteCloser,
 	req *rpc.NonceRequest,
 	resp *rpc.NonceResponse,
-	secret []byte,
+	secret []byte) conntypes.StreamReadWriteCloser {
-) conntypes.StreamReadWriteCloser {
 	localAddr := parent.LocalAddr()
 	remoteAddr := parent.RemoteAddr()
 
@@ -54,8 +53,7 @@ func mtprotoDeriveKeys(purpose mtprotoCipherPurpose,
 	req *rpc.NonceRequest,
 	resp *rpc.NonceResponse,
 	client, remote *net.TCPAddr,
-	secret []byte,
+	secret []byte) ([]byte, []byte) {
-) ([]byte, []byte) {
 	message := bytes.Buffer{}
 
 	message.Write(resp.Nonce)
@@ -100,11 +98,11 @@ func mtprotoDeriveKeys(purpose mtprotoCipherPurpose,
 	message.Write(req.Nonce)
 
 	data := message.Bytes()
-	md5sum := md5.Sum(data[1:]) //nolint: gas
+	md5sum := md5.Sum(data[1:]) // nolint: gas
-	sha1sum := sha1.Sum(data)   //nolint: gosec
+	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[:]
 }

wrappers/stream/obfuscated2.go

@@ -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 //nolint: wrapcheck
+		return n, err
 	}
 
 	w.decryptor.XORKeyStream(p, p[:n])
@@ -48,7 +48,7 @@ func (w *wrapperObfuscated2) WriteTimeout(p []byte, timeout time.Duration) (int,
 
 	w.encryptor.XORKeyStream(buf, buf)
 
-	return w.parent.WriteTimeout(buf, timeout) //nolint: wrapcheck
+	return w.parent.WriteTimeout(buf, timeout)
 }
 
 func (w *wrapperObfuscated2) Write(p []byte) (int, error) {
@@ -60,7 +60,7 @@ func (w *wrapperObfuscated2) Write(p []byte) (int, error) {
 
 	w.encryptor.XORKeyStream(buf, buf)
 
-	return w.parent.Write(buf) //nolint: wrapcheck
+	return w.parent.Write(buf)
 }
 
 func (w *wrapperObfuscated2) Conn() net.Conn {
@@ -80,12 +80,11 @@ func (w *wrapperObfuscated2) RemoteAddr() *net.TCPAddr {
 }
 
 func (w *wrapperObfuscated2) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func NewObfuscated2(socket conntypes.StreamReadWriteCloser,
-	encryptor, decryptor cipher.Stream,
+	encryptor, decryptor cipher.Stream) conntypes.StreamReadWriteCloser {
-) conntypes.StreamReadWriteCloser {
 	return &wrapperObfuscated2{
 		parent:    socket,
 		encryptor: encryptor,

wrappers/stream/rewind.go

@@ -18,31 +18,55 @@ type ReadWriteCloseRewinder interface {
 
 type wrapperRewind struct {
 	parent   conntypes.StreamReadWriteCloser
-	activeReader io.Reader
 	buf      bytes.Buffer
 	mutex    sync.Mutex
+	rewinded bool
 }
 
 func (w *wrapperRewind) Write(p []byte) (int, error) {
-	return w.parent.Write(p) //nolint: wrapcheck
+	return w.parent.Write(p)
 }
 
 func (w *wrapperRewind) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.WriteTimeout(p, timeout) //nolint: wrapcheck
+	return w.parent.WriteTimeout(p, timeout)
 }
 
 func (w *wrapperRewind) Read(p []byte) (int, error) {
 	w.mutex.Lock()
 	defer w.mutex.Unlock()
 
-	return w.activeReader.Read(p) //nolint: wrapcheck
+	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
 }
 
-func (w *wrapperRewind) ReadTimeout(p []byte, _ time.Duration) (int, error) {
+func (w *wrapperRewind) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
 	w.mutex.Lock()
 	defer w.mutex.Unlock()
 
-	return w.activeReader.Read(p) //nolint: wrapcheck
+	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
 }
 
 func (w *wrapperRewind) Conn() net.Conn {
@@ -64,20 +88,17 @@ func (w *wrapperRewind) RemoteAddr() *net.TCPAddr {
 func (w *wrapperRewind) Close() error {
 	w.buf.Reset()
 
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func (w *wrapperRewind) Rewind() {
 	w.mutex.Lock()
-	w.activeReader = io.MultiReader(&w.buf, w.parent)
+	w.rewinded = true
 	w.mutex.Unlock()
 }
 
 func NewRewind(parent conntypes.StreamReadWriteCloser) ReadWriteCloseRewinder {
-	rv := &wrapperRewind{
+	return &wrapperRewind{
 		parent: parent,
 	}
-	rv.activeReader = io.TeeReader(parent, &rv.buf)
-
-	return rv
 }

wrappers/stream/stats_telegram.go

@@ -17,19 +17,19 @@ type wrapperTelegramStats struct {
 }
 
 func (w *wrapperTelegramStats) Write(p []byte) (int, error) {
-	return w.parent.Write(p) //nolint: wrapcheck
+	return w.parent.Write(p)
 }
 
 func (w *wrapperTelegramStats) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.WriteTimeout(p, timeout) //nolint: wrapcheck
+	return w.parent.WriteTimeout(p, timeout)
 }
 
 func (w *wrapperTelegramStats) Read(p []byte) (int, error) {
-	return w.parent.Read(p) //nolint: wrapcheck
+	return w.parent.Read(p)
 }
 
 func (w *wrapperTelegramStats) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.ReadTimeout(p, timeout) //nolint: wrapcheck
+	return w.parent.ReadTimeout(p, timeout)
 }
 
 func (w *wrapperTelegramStats) Conn() net.Conn {
@@ -56,7 +56,7 @@ func (w *wrapperTelegramStats) Close() error {
 		stats.Stats.TelegramDisconnected(w.dc, w.RemoteAddr())
 	})
 
-	return err //nolint: wrapcheck
+	return err
 }
 
 func NewTelegramStats(dc conntypes.DC, parent conntypes.StreamReadWriteCloser) conntypes.StreamReadWriteCloser {

wrappers/stream/stats_traffic.go

@@ -17,28 +17,28 @@ func (w *wrapperTrafficStats) Write(p []byte) (int, error) {
 	n, err := w.parent.Write(p)
 	stats.Stats.EgressTraffic(n)
 
-	return n, err //nolint: wrapcheck
+	return n, err
 }
 
 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 //nolint: wrapcheck
+	return n, err
 }
 
 func (w *wrapperTrafficStats) Read(p []byte) (int, error) {
 	n, err := w.parent.Read(p)
 	stats.Stats.IngressTraffic(n)
 
-	return n, err //nolint: wrapcheck
+	return n, err
 }
 
 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 //nolint: wrapcheck
+	return n, err
 }
 
 func (w *wrapperTrafficStats) Conn() net.Conn {
@@ -58,7 +58,7 @@ func (w *wrapperTrafficStats) RemoteAddr() *net.TCPAddr {
 }
 
 func (w *wrapperTrafficStats) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func NewTrafficStats(parent conntypes.StreamReadWriteCloser) conntypes.StreamReadWriteCloser {

wrappers/stream/timeout.go

@@ -18,23 +18,23 @@ type wrapperTimeout struct {
 }
 
 func (w *wrapperTimeout) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.WriteTimeout(p, timeout) //nolint: wrapcheck
+	return w.parent.WriteTimeout(p, timeout)
 }
 
 func (w *wrapperTimeout) Write(p []byte) (int, error) {
-	return w.parent.WriteTimeout(p, timeoutWrite) //nolint: wrapcheck
+	return w.parent.WriteTimeout(p, timeoutWrite)
 }
 
 func (w *wrapperTimeout) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
-	return w.parent.ReadTimeout(p, timeout) //nolint: wrapcheck
+	return w.parent.ReadTimeout(p, timeout)
 }
 
 func (w *wrapperTimeout) Read(p []byte) (int, error) {
-	return w.parent.ReadTimeout(p, timeoutRead) //nolint: wrapcheck
+	return w.parent.ReadTimeout(p, timeoutRead)
 }
 
 func (w *wrapperTimeout) Close() error {
-	return w.parent.Close() //nolint: wrapcheck
+	return w.parent.Close()
 }
 
 func (w *wrapperTimeout) Conn() net.Conn {