Update dependencies

Fix urls for missed IPs

.dockerignore

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

.github/workflows/ci.yaml

@@ -0,0 +1,133 @@
+---
+
+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:
+          - ~1.14
+          - ~1.15
+          - ^1.16
+    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: v1.37.1
+
+  docker:
+    name: Docker
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    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
+          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

@@ -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

.gitignore

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

.golangci.toml

@@ -10,4 +10,4 @@ format = "colored-line-number"
 
 [linters]
 enable-all = true
-disable = ["gochecknoglobals", "gomnd"]
+disable = ["gochecknoglobals", "gas", "gomnd", "goerr113", "exhaustivestruct"]

.travis.yml

@@ -1,19 +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

Dockerfile

@@ -1,7 +1,7 @@
 ###############################################################################
 # BUILD STAGE
 
-FROM golang:1.13-alpine
+FROM golang:1.15-alpine AS build
 
 RUN set -x \
   && apk --no-cache --update add \
@@ -9,15 +9,13 @@ RUN set -x \
     ca-certificates \
     curl \
     git \
-    make \
+    make
-    upx
 
-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
-  && make -j 4 static \
-  && upx --ultra-brute -qq ./mtg
 
 
 ###############################################################################
@@ -26,11 +24,9 @@ RUN set -x \
 FROM scratch
 
 ENTRYPOINT ["/mtg"]
-ENV MTG_IP=0.0.0.0 \
+ENV MTG_BIND=0.0.0.0:3128 \
-    MTG_PORT=3128 \
+    MTG_STATS_BIND=0.0.0.0:3129
-    MTG_STATS_IP=0.0.0.0 \
-    MTG_STATS_PORT=3129
 EXPOSE 3128 3129
 
-COPY --from=0 /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=build /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 /app/mtg /mtg

Makefile

@@ -4,71 +4,89 @@ 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 := v1.23.3
+GOLANGCI_LINT_VERSION := v1.37.1
 
 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 := -mod=readonly -ldflags="-s -w -X 'main.version=$(VERSION_TAG) ($(VERSION_GO)) [$(VERSION_DATE)]'"
 
-MOD_ON  := env GO111MODULE=on
+GOBIN  := $(ROOT_DIR)/.bin
-MOD_OFF := env GO111MODULE=auto
+GOTOOL := env "GOBIN=$(GOBIN)" "PATH=$(ROOT_DIR)/.bin:$(PATH)"
 
 # -----------------------------------------------------------------------------
 
-$(APP_NAME):
+.PHONY: all
-	@$(MOD_ON) go build $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
+all: build
 
-static-$(APP_NAME):
+.PHONY: build
-	@$(MOD_ON) env CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
+build:
+	@go build $(COMMON_BUILD_FLAGS) -o "$(APP_NAME)"
+
+$(APP_NAME): build
+
+.PHONY: static
+static:
+	@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)" \
+	@env "GOOS=$(GOOS)" "GOARCH=$(GOARCH)" \
 		go build \
 		$(COMMON_BUILD_FLAGS) \
 		-o "./ccbuilds/$(APP_NAME)-$(GOOS)-$(GOARCH)"
 
+.PHONY: ccbuilds
 ccbuilds:
 	@rm -rf ./ccbuilds && mkdir -p ./ccbuilds
 
 vendor: go.mod go.sum
 	@$(MOD_ON) go mod vendor
 
-# -----------------------------------------------------------------------------
+.PHONY: test
+test:
+	@go test -v ./...
 
-.PHONY: all
+.PHONY: citest
-all: $(APP_NAME)
+citest:
-
+	@go test -coverprofile=coverage.txt -covermode=atomic -race -v ./...
-.PHONY: static
-static: static-$(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) golangci-lint run
-
 .PHONY: clean
 clean:
 	@git clean -xfd && \
 		git reset --hard >/dev/null && \
 		git submodule foreach --recursive sh -c 'git clean -xfd && git reset --hard' >/dev/null
 
+.PHONY: lint
+lint:
+	@$(GOTOOL) golangci-lint run
+
 .PHONY: docker
 docker:
 	@docker build --pull -t "$(IMAGE_NAME)" "$(ROOT_DIR)"
 
-.PHONY: prepare
+.PHONY: doc
-prepare: install-lint
+doc:
+	@$(GOTOOL) godoc -http 0.0.0.0:10000
 
-.PHONY: install-lint
+.PHONY: install-tools
-install-lint:
+install-tools: install-tools-lint install-tools-godoc
-	@curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh \
+
-		| $(MOD_OFF) bash -s -- -b $(GOPATH)/bin $(GOLANGCI_LINT_VERSION)
+.PHONY: install-tools-lint
+install-tools-lint:
+	@mkdir -p "$(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: update-deps
+upgrade-deps:
+	$go get -u && go mod tidy

README.md

@@ -189,16 +189,18 @@ 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_ADDR`             | `--statsd-addr`              |                                   | host:port of statsd service. No defaults, by default 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.                                                                                                                                                                                 |
-| `MTG_BUFFER_WRITE`            | `-w`, `--write-buffer`       | `64KB`                           | The size of TCP write buffer in bytes. Write buffer is the buffer for messages which are going from client to Telegram.                                                                                                                                                         |
+| `MTG_BUFFER_WRITE`            | `-w`, `--write-buffer`       | `32KB`                            | The size of TCP write buffer in bytes. Write buffer is the buffer for messages which are going from client to Telegram.                                                                                                                                                         |
-| `MTG_BUFFER_READ`             | `-r`, `--read-buffer`        | `128KB`                          | The size of TCP read buffer in bytes. Read buffer is the buffer for messages from Telegram to client.                                                                                                                                                                           |
+| `MTG_BUFFER_READ`             | `-r`, `--read-buffer`        | `32KB`                            | The size of TCP read buffer in bytes. Read buffer is the buffer for messages from Telegram to client.                                                                                                                                                                           |
 | `MTG_ANTIREPLAY_MAXSIZE`      | `--anti-replay-max-size`     | `128MB`                           | Max size of antireplay cache.                                                                                                                                                                                                                                                   |
 | `MTG_CLOAK_PORT`              | `--cloak-port`               | `443`                             | Which port we should use to connect to cloaked host in FakeTLS mode.                                                                                                                                                                                                            |
 | `MTG_MULTIPLEX_PERCONNECTION` | `--multiplex-per-connection` | `50`                              | How many client connections can share a single Telegram connection in adtag mode                                                                                                                                                                                                |
+| `MTG_NTP_SERVERS`             | `--ntp-server`               | default pool                      | A list of NTP servers to use.                                                                                                                                                                                                                                                   |
+| `MTG_PREFER_DIRECT_IP`        | `--prefer-ip`                | `ipv6`                            | Which IP protocol to prefer if possible. Works mostly in direct mode.                                                                                                                                                                                                           |
+
 
 Usually you want to modify only read/write buffer sizes. If you feel
 that proxy is slow, try to increase both sizes giving more priority to

SECURITY.md

@@ -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

antireplay/init.go

@@ -3,9 +3,8 @@ package antireplay
 import (
 	"sync"
 
-	"github.com/VictoriaMetrics/fastcache"
-
 	"github.com/9seconds/mtg/config"
+	"github.com/VictoriaMetrics/fastcache"
 )
 
 type CacheInterface interface {

cli/proxy.go

@@ -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()
@@ -50,7 +49,7 @@ func Proxy() error { // nolint: funlen
 
 	zap.S().Debugw("Configuration", "config", config.Printable())
 
-	if len(config.C.AdTag) > 0 {
+	if config.C.MiddleProxyMode() {
 		zap.S().Infow("Use middle proxy connection to Telegram")
 
 		diff, err := ntp.Fetch()

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)
+		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{}) {

config/config.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"math"
 	"net"
 
 	"github.com/alecthomas/units"
@@ -21,6 +22,8 @@ func (s SecretMode) String() string {
 		return "simple"
 	case SecretModeSecured:
 		return "secured"
+	case SecretModeTLS:
+		return "tls"
 	}
 
 	return "tls"
@@ -32,6 +35,13 @@ const (
 	SecretModeTLS
 )
 
+type PreferIP uint8
+
+const (
+	PreferIPv4 PreferIP = iota
+	PreferIPv6
+)
+
 const SimpleSecretLength = 16
 
 type OptionType uint8
@@ -40,6 +50,8 @@ const (
 	OptionTypeDebug OptionType = iota
 	OptionTypeVerbose
 
+	OptionTypePreferIP
+
 	OptionTypeBind
 	OptionTypePublicIPv4
 	OptionTypePublicIPv6
@@ -59,6 +71,8 @@ const (
 
 	OptionTypeMultiplexPerConnection
 
+	OptionTypeNTPServers
+
 	OptionTypeSecret
 	OptionTypeAdtag
 )
@@ -86,11 +100,59 @@ type Config struct {
 	Debug      bool       `json:"debug"`
 	Verbose    bool       `json:"verbose"`
 	SecretMode SecretMode `json:"secret_mode"`
+	PreferIP   PreferIP   `json:"prefer_ip"`
+	NTPServers []string   `json:"ntp_servers"`
 
 	Secret []byte `json:"secret"`
 	AdTag  []byte `json:"adtag"`
 }
 
+func (c *Config) ClientReadBuffer() int {
+	return c.ReadBuffer
+}
+
+func (c *Config) ClientWriteBuffer() int {
+	return c.WriteBuffer
+}
+
+func (c *Config) MiddleProxyMode() bool {
+	return len(c.AdTag) > 0
+}
+
+func (c *Config) ProxyReadBuffer() int {
+	value := c.ReadBuffer
+
+	if c.MiddleProxyMode() {
+		value = c.adjustProxyValue(value)
+	}
+
+	return value
+}
+
+func (c *Config) ProxyWriteBuffer() int {
+	value := c.WriteBuffer
+
+	if c.MiddleProxyMode() {
+		value = c.adjustProxyValue(value)
+	}
+
+	return value
+}
+
+func (c *Config) adjustProxyValue(value int) int {
+	if c.MultiplexPerConnection == 0 {
+		return value
+	}
+
+	fvalue := float64(value)
+
+	newValue := fvalue * 2 * math.Log(float64(c.MultiplexPerConnection))
+	newValue = math.Ceil(newValue)
+	newValue = math.Max(fvalue, newValue)
+
+	return int(newValue)
+}
+
 type Opt struct {
 	Option OptionType
 	Value  interface{}
@@ -98,13 +160,23 @@ 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)
 		case OptionTypeVerbose:
 			C.Verbose = opt.Value.(bool)
+		case OptionTypePreferIP:
+			value := opt.Value.(string)
+			switch value {
+			case "ipv4":
+				C.PreferIP = PreferIPv4
+			case "ipv6":
+				C.PreferIP = PreferIPv6
+			default:
+				return fmt.Errorf("incorrect direct IP mode %s", value)
+			}
 		case OptionTypeBind:
 			C.Bind = opt.Value.(*net.TCPAddr)
 		case OptionTypePublicIPv4:
@@ -145,6 +217,11 @@ func Init(options ...Opt) error { // nolint: gocyclo, funlen
 			C.AntiReplayMaxSize = int(opt.Value.(units.Base2Bytes))
 		case OptionTypeMultiplexPerConnection:
 			C.MultiplexPerConnection = int(opt.Value.(uint))
+		case OptionTypeNTPServers:
+			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)
 		case OptionTypeAdtag:

config/global_ips.go

@@ -60,7 +60,7 @@ func fetchIP(ctx context.Context, network string) (net.IP, error) {
 		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)
 	if err != nil {

config/urls.go

@@ -15,8 +15,8 @@ type URLs struct {
 }
 
 type IPURLs struct {
-	IPv4      URLs   `json:"ipv4"`
+	IPv4      *URLs  `json:"ipv4,omitempty"`
-	IPv6      URLs   `json:"ipv6"`
+	IPv6      *URLs  `json:"ipv6,omitempty"`
 	BotSecret string `json:"secret_for_mtproxybot"`
 }
 
@@ -32,25 +32,33 @@ func GetURLs() (urls 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 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)
+	return &URLs{
-	urls.TMe = makeTMeURL(values)
+		TG:        makeTGURL(values),
-	urls.TGQRCode = makeQRCodeURL(urls.TG)
+		TMe:       makeTMeURL(values),
-	urls.TMeQRCode = makeQRCodeURL(urls.TG)
+		TGQRCode:  makeQRCodeURL(urls.TG),
-
+		TMeQRCode: makeQRCodeURL(urls.TMe),
-	return
+	}
 }
 
 func makeTGURL(values url.Values) string {

conntypes/protocol.go

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

conntypes/type.go

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

faketls/client_protocol.go

@@ -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 {
@@ -63,7 +64,10 @@ func (c *ClientProtocol) tlsHandshake(conn io.ReadWriter) error {
 		return fmt.Errorf("cannot read initial record: %w", err)
 	}
 
-	clientHello, err := tlstypes.ParseClientHello(helloRecord.Data.Bytes())
+	buf := &bytes.Buffer{}
+	helloRecord.Data.WriteBytes(buf)
+
+	clientHello, err := tlstypes.ParseClientHello(buf.Bytes())
 	if err != nil {
 		return fmt.Errorf("cannot parse client hello: %w", err)
 	}
@@ -85,6 +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")
 	}
 
@@ -103,8 +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
 	}

faketls/cloak.go

@@ -28,15 +28,9 @@ func cloak(one, another io.ReadWriteCloser) {
 
 	wg.Add(2)
 
-	go func() {
+	go cloakPipe(one, another, wg)
-		defer wg.Done()
-		io.Copy(one, another) // nolint: errcheck
-	}()
 
-	go func() {
+	go cloakPipe(another, one, wg)
-		defer wg.Done()
-		io.Copy(another, one) // nolint: errcheck
-	}()
 
 	go func() {
 		wg.Wait()
@@ -59,9 +53,11 @@ func cloak(one, another io.ReadWriteCloser) {
 				return
 			case <-lastActivityTimer.C:
 				cancel()
+
 				return
 			case <-maxTimer.C:
 				cancel()
+
 				return
 			}
 		}
@@ -69,3 +65,9 @@ func cloak(one, another io.ReadWriteCloser) {
 
 	<-ctx.Done()
 }
+
+func cloakPipe(one io.Writer, another io.Reader, wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	io.Copy(one, another) // nolint: errcheck
+}

go.mod

@@ -4,18 +4,22 @@ go 1.13
 
 require (
 	github.com/VictoriaMetrics/fastcache v1.5.7
-	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d
+	github.com/alecthomas/units v0.0.0-20210208195552-ff826a37aa15
-	github.com/beevik/ntp v0.2.0
+	github.com/beevik/ntp v0.3.0
-	github.com/golang/protobuf v1.3.3 // indirect
+	github.com/golang/snappy v0.0.3 // indirect
-	github.com/prometheus/client_golang v1.4.0
+	github.com/prometheus/client_golang v1.9.0
-	github.com/smira/go-statsd v1.3.1
+	github.com/prometheus/common v0.18.0 // indirect
-	go.uber.org/atomic v1.5.1 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
-	go.uber.org/multierr v1.4.0 // indirect
+	github.com/smira/go-statsd v1.3.2
-	go.uber.org/zap v1.13.0
+	go.uber.org/multierr v1.6.0 // indirect
-	golang.org/x/crypto v0.0.0-20200128174031-69ecbb4d6d5d
+	go.uber.org/zap v1.16.0
-	golang.org/x/lint v0.0.0-20200130185559-910be7a94367 // indirect
+	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
-	golang.org/x/net v0.0.0-20200202094626-16171245cfb2 // indirect
+	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
-	golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5
+	golang.org/x/mod v0.4.1 // indirect
-	golang.org/x/tools v0.0.0-20200204074204-1cc6d1ef6c74 // indirect
+	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
+	golang.org/x/sys v0.0.0-20210303074136-134d130e1a04
+	golang.org/x/tools v0.1.0 // 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
 )

go.sum

@@ -1,184 +1,472 @@
+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=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
+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/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc h1:cAKDfWh5VpdgMhJosfJnn5/FoN2SRZ4p7fJNX58YPaU=
+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/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
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 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
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 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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+google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
+google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
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+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
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 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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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/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
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 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
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-honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
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+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=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=

hub/connection.go

@@ -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
 		}
 

hub/connection_list.go

@@ -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)
 	}
 

main.go

@@ -7,11 +7,10 @@ import (
 	"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
@@ -43,6 +42,11 @@ var (
 		Short('v').
 		Envar("MTG_VERBOSE").
 		Bool()
+	runPreferIP = runCommand.Flag("prefer-ip",
+		"Prefer this IP protocol if possible. Valid options are 'ipv4' and 'ipv6'").
+		Envar("MTG_PREFER_DIRECT_IP").
+		Default("ipv6").
+		Enum("ipv4", "ipv6")
 	runBind = runCommand.Flag("bind",
 		"Host:Port to bind proxy to.").
 		Short('b').
@@ -87,13 +91,13 @@ var (
 		"Write buffer size. You can think about it as a buffer from client to Telegram.").
 		Short('w').
 		Envar("MTG_BUFFER_WRITE").
-		Default("64KB").
+		Default("32KB").
 		Bytes()
 	runReadBufferSize = runCommand.Flag("read-buffer",
 		"Read buffer size. You can think about it as a buffer from Telegram to client.").
 		Short('r').
 		Envar("MTG_BUFFER_READ").
-		Default("128KB").
+		Default("32KB").
 		Bytes()
 	runTLSCloakPort = runCommand.Flag("cloak-port",
 		"Port which should be used for host cloaking.").
@@ -110,6 +114,11 @@ var (
 		Envar("MTG_MULTIPLEX_PERCONNECTION").
 		Default("50").
 		Uint()
+	runNTPServers = runCommand.Flag("ntp-server",
+		"A list of NTP servers to use.").
+		Envar("MTG_NTP_SERVERS").
+		Default("0.pool.ntp.org", "1.pool.ntp.org", "2.pool.ntp.org", "3.pool.ntp.org").
+		Strings()
 	runSecret = runCommand.Arg("secret", "Secret of this proxy.").Required().HexBytes()
 	runAdtag  = runCommand.Arg("adtag", "ADTag of the proxy.").HexBytes()
 )
@@ -130,6 +139,7 @@ func main() {
 		err := config.Init(
 			config.Opt{Option: config.OptionTypeDebug, Value: *runDebug},
 			config.Opt{Option: config.OptionTypeVerbose, Value: *runVerbose},
+			config.Opt{Option: config.OptionTypePreferIP, Value: *runPreferIP},
 			config.Opt{Option: config.OptionTypeBind, Value: *runBind},
 			config.Opt{Option: config.OptionTypePublicIPv4, Value: *runPublicIPv4},
 			config.Opt{Option: config.OptionTypePublicIPv6, Value: *runPublicIPv6},
@@ -143,6 +153,7 @@ func main() {
 			config.Opt{Option: config.OptionTypeCloakPort, Value: *runTLSCloakPort},
 			config.Opt{Option: config.OptionTypeAntiReplayMaxSize, Value: *runAntiReplayMaxSize},
 			config.Opt{Option: config.OptionTypeMultiplexPerConnection, Value: *runMultiplexPerConnection},
+			config.Opt{Option: config.OptionTypeNTPServers, Value: *runNTPServers},
 			config.Opt{Option: config.OptionTypeSecret, Value: *runSecret},
 			config.Opt{Option: config.OptionTypeAdtag, Value: *runAdtag},
 		)

mtproto/protocol.go

@@ -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

mtproto/rpc/consts.go

@@ -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}

mtproto/rpc/handshake_response.go

@@ -17,10 +17,10 @@ type HandshakeResponse struct {
 func (r *HandshakeResponse) Bytes() []byte {
 	buf := &bytes.Buffer{}
 
-	buf.Write(r.Type)      // nolint: gosec
+	buf.Write(r.Type)
-	buf.Write(r.Flags)     // nolint: gosec
+	buf.Write(r.Flags)
-	buf.Write(r.SenderPID) // nolint: gosec
+	buf.Write(r.SenderPID)
-	buf.Write(r.PeerPID)   // nolint: gosec
+	buf.Write(r.PeerPID)
 
 	return buf.Bytes()
 }

mtproto/rpc/nonce_response.go

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

ntp/ntp.go

@@ -5,22 +5,16 @@ import (
 	"math/rand"
 	"time"
 
+	"github.com/9seconds/mtg/config"
 	"github.com/beevik/ntp"
 	"go.uber.org/zap"
 )
 
 const autoUpdatePeriod = time.Minute
 
-var ntpEndpoints = [...]string{
-	"0.pool.ntp.org",
-	"1.pool.ntp.org",
-	"2.pool.ntp.org",
-	"3.pool.ntp.org",
-}
-
 // Fetch fetches the data on time drift.
 func Fetch() (time.Duration, error) {
-	url := ntpEndpoints[rand.Intn(len(ntpEndpoints))]
+	url := config.C.NTPServers[rand.Intn(len(config.C.NTPServers))] // nolint: gosec
 
 	resp, err := ntp.Query(url)
 	if err != nil {
@@ -45,6 +39,7 @@ func AutoUpdate() {
 		diff, err := Fetch()
 		if err != nil {
 			logger.Debugw("Cannot fetch time from NTP", "error", err)
+
 			continue
 		}
 

obfuscated2/client_protocol.go

@@ -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")
 	}
 

obfuscated2/frame.go

@@ -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
 }

protocol/request.go

@@ -3,9 +3,8 @@ package protocol
 import (
 	"context"
 
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )
 
 type TelegramRequest struct {

proxy/direct.go

@@ -4,19 +4,18 @@ 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 * 1024
+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)
@@ -42,8 +41,9 @@ func directPipe(dst io.WriteCloser, src io.ReadCloser, wg *sync.WaitGroup, logge
 		wg.Done()
 	}()
 
-	buf := make([]byte, directPipeBufferSize)
+	buf := [directPipeBufferSize]byte{}
-	if _, err := io.CopyBuffer(dst, src, buf); err != nil {
+
+	if _, err := io.CopyBuffer(dst, src, buf[:]); err != nil {
 		logger.Debugw("Cannot pump sockets", "error", err)
 	}
 }

proxy/middle.go

@@ -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()
@@ -27,7 +27,7 @@ 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")
 	}
 
@@ -53,15 +53,17 @@ 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
 		}
 	}

proxy/proxy.go

@@ -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 {
@@ -51,8 +50,9 @@ func (p *Proxy) accept(conn net.Conn) {
 	connID := conntypes.NewConnID()
 	logger := p.Logger.With("connection_id", connID)
 
-	if err := utils.InitTCP(conn); err != nil {
+	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)
@@ -90,7 +90,7 @@ func (p *Proxy) accept(conn net.Conn) {
 
 	err = nil
 
-	if len(config.C.AdTag) > 0 {
+	if config.C.MiddleProxyMode() {
 		middleConnection(req)
 	} else {
 		err = directConnection(req)

stats/stats_prometheus.go

@@ -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 {
@@ -51,10 +50,14 @@ 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)

stats/stats_statsd.go

@@ -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 (
@@ -91,8 +90,10 @@ func (s *statsStatsd) changeConnections(connectionType conntypes.ConnectionType,
 		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]
+	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...)
 	}

telegram/api/api.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -18,7 +19,10 @@ 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, "GET", url, nil)
 	if err != nil {
 		panic(err)
 	}
@@ -36,5 +40,5 @@ func request(url string) (io.ReadCloser, error) {
 		return nil, fmt.Errorf("cannot perform a request: %w", err)
 	}
 
-	return resp.Body, err
+	return resp.Body, err // nolint: wrapcheck
 }

telegram/base.go

@@ -5,11 +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 {
@@ -29,25 +29,17 @@ func (b *baseTelegram) Secret() []byte {
 
 func (b *baseTelegram) dial(dc conntypes.DC,
 	protocol conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error) {
-	addresses := make([]string, 0, 2)
+	for _, addr := range b.getAddresses(dc, protocol) {
-
-	if protocol&conntypes.ConnectionProtocolIPv6 != 0 {
-		addresses = append(addresses, b.chooseAddress(b.v6Addresses, dc, b.v6DefaultDC))
-	}
-
-	if protocol&conntypes.ConnectionProtocolIPv4 != 0 {
-		addresses = append(addresses, b.chooseAddress(b.v4Addresses, dc, b.v4DefaultDC))
-	}
-
-	for _, addr := range addresses {
 		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); err != nil {
+		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
 		}
 
@@ -57,6 +49,30 @@ func (b *baseTelegram) dial(dc conntypes.DC,
 	return nil, errors.New("cannot dial to the chosen DC")
 }
 
+func (b *baseTelegram) getAddresses(dc conntypes.DC, protocol conntypes.ConnectionProtocol) []string {
+	addresses := make([]string, 0, 2)
+	protos := []conntypes.ConnectionProtocol{
+		conntypes.ConnectionProtocolIPv6,
+		conntypes.ConnectionProtocolIPv4,
+	}
+
+	if config.C.PreferIP == config.PreferIPv4 {
+		protos[0], protos[1] = protos[1], protos[0]
+	}
+
+	for _, proto := range protos {
+		switch {
+		case proto&protocol == 0:
+		case proto&conntypes.ConnectionProtocolIPv6 != 0:
+			addresses = append(addresses, b.chooseAddress(b.v6Addresses, dc, b.v6DefaultDC))
+		case proto&conntypes.ConnectionProtocolIPv4 != 0:
+			addresses = append(addresses, b.chooseAddress(b.v4Addresses, dc, b.v4DefaultDC))
+		}
+	}
+
+	return addresses
+}
+
 func (b *baseTelegram) chooseAddress(addresses map[conntypes.DC][]string,
 	dc, defaultDC conntypes.DC) string {
 	addrs, ok := addresses[dc]
@@ -68,7 +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))]
+		return addrs[rand.Intn(len(addrs))] // nolint: gosec
 	}
 
 	return ""

telegram/middle.go

@@ -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

tlstypes/client_hello.go

@@ -25,7 +25,7 @@ func (c ClientHello) Digest() []byte {
 	}
 
 	mac := hmac.New(sha256.New, config.C.Secret)
-	mac.Write(rec.Bytes()) // nolint: errcheck
+	rec.WriteBytes(mac)
 	computedDigest := mac.Sum(nil)
 
 	for i := range computedDigest {

tlstypes/consts.go

@@ -1,5 +1,7 @@
 package tlstypes
 
+import "io"
+
 type RecordType uint8
 
 const (
@@ -18,9 +20,9 @@ const (
 type CipherSuiteType uint8
 
 const (
-	CipherSuiteType_TLS_AES_128_GCM_SHA256       CipherSuiteType = iota // nolint: stylecheck, golint
+	CipherSuiteType_TLS_AES_128_GCM_SHA256       CipherSuiteType = iota // nolint: stylecheck,golint,revive
-	CipherSuiteType_TLS_AES_256_GCM_SHA384                              // nolint: stylecheck, golint
+	CipherSuiteType_TLS_AES_256_GCM_SHA384                              // nolint: stylecheck,golint,revive
-	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256                        // nolint: stylecheck, golint
+	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256                        // nolint: stylecheck,golint,revive
 )
 
 func (c CipherSuiteType) Bytes() []byte {
@@ -29,6 +31,8 @@ func (c CipherSuiteType) Bytes() []byte {
 		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_CHACHA20_POLY1305_SHA256:
+		return CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes
 	}
 
 	return CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes
@@ -44,6 +48,8 @@ func (v Version) Bytes() []byte {
 		return Version12Bytes
 	case Version11:
 		return Version11Bytes
+	case Version10, VersionUnknown:
+		return Version10Bytes
 	}
 
 	return Version10Bytes
@@ -63,17 +69,22 @@ 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_128_GCM_SHA256_Bytes       = []byte{0x13, 0x01} // nolint: stylecheck,golint,revive
-	CipherSuiteType_TLS_AES_256_GCM_SHA384_Bytes       = []byte{0x13, 0x02} // nolint: stylecheck, golint
+	CipherSuiteType_TLS_AES_256_GCM_SHA384_Bytes       = []byte{0x13, 0x02} // nolint: stylecheck,golint,revive
-	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes = []byte{0x13, 0x03} // nolint; stylecheck, golint
+	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes = []byte{0x13, 0x03} // nolint: stylecheck,golint,revive
 )
 
 type Byter interface {
-	Bytes() []byte
+	WriteBytes(io.Writer)
+	Len() int
 }
 
 type RawBytes []byte
 
-func (r RawBytes) Bytes() []byte {
+func (r RawBytes) WriteBytes(writer io.Writer) {
-	return []byte(r)
+	writer.Write(r) // nolint: errcheck
+}
+
+func (r RawBytes) Len() int {
+	return len(r)
 }

tlstypes/handshake.go

@@ -2,6 +2,7 @@ package tlstypes
 
 import (
 	"bytes"
+	"io"
 
 	"github.com/9seconds/mtg/utils"
 )
@@ -14,24 +15,29 @@ type Handshake struct {
 	Tail      Byter
 }
 
-func (h *Handshake) Bytes() []byte {
+func (h *Handshake) WriteBytes(writer io.Writer) {
-	buf := bytes.Buffer{}
 	packetBuf := bytes.Buffer{}
 
-	buf.WriteByte(byte(h.Type))
+	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)
-	packetBuf.Write(h.Tail.Bytes())
+	h.Tail.WriteBytes(&packetBuf)
 
 	sizeUint24 := utils.ToUint24(uint32(packetBuf.Len()))
 	sizeUint24Bytes := sizeUint24[:]
 	sizeUint24Bytes[0], sizeUint24Bytes[2] = sizeUint24Bytes[2], sizeUint24Bytes[0]
 
-	buf.Write(sizeUint24Bytes)
+	writer.Write(sizeUint24Bytes) // nolint: errcheck
-	packetBuf.WriteTo(&buf) // nolint: errcheck
+	packetBuf.WriteTo(writer)     // nolint: errcheck
+}
 
-	return buf.Bytes()
+func (h *Handshake) Len() int {
+	buf := bytes.Buffer{}
+
+	h.WriteBytes(&buf)
+
+	return buf.Len()
 }

tlstypes/record.go

@@ -15,16 +15,15 @@ type Record struct {
 	Data    Byter
 }
 
-func (r Record) Bytes() []byte {
+func (r Record) WriteBytes(writer io.Writer) {
-	buf := bytes.Buffer{}
+	writer.Write([]byte{byte(r.Type)})                           // nolint: errcheck
-	data := r.Data.Bytes()
+	writer.Write(r.Version.Bytes())                              // nolint: errcheck
+	binary.Write(writer, binary.BigEndian, uint16(r.Data.Len())) // nolint: errcheck
+	r.Data.WriteBytes(writer)
+}
 
-	buf.WriteByte(byte(r.Type))
+func (r Record) Len() int {
-	buf.Write(r.Version.Bytes())
+	return 1 + 2 + 2 + r.Data.Len()
-	binary.Write(&buf, binary.BigEndian, uint16(len(data))) // nolint: errcheck
-	buf.Write(data)
-
-	return buf.Bytes()
 }
 
 func ReadRecord(reader io.Reader) (Record, error) {

tlstypes/server_hello.go

@@ -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 {
@@ -20,22 +19,24 @@ type ServerHello struct {
 }
 
 func (s ServerHello) WelcomePacket() []byte {
+	buf := &bytes.Buffer{}
+
 	s.Random = [32]byte{}
 	rec := Record{
 		Type:    RecordTypeHandshake,
 		Version: Version12,
 		Data:    &s,
 	}
-	buf := bytes.NewBuffer(rec.Bytes())
+	rec.WriteBytes(buf)
 
 	recChangeCipher := Record{
 		Type:    RecordTypeChangeCipherSpec,
 		Version: Version12,
 		Data:    RawBytes([]byte{0x01}),
 	}
-	buf.Write(recChangeCipher.Bytes())
+	recChangeCipher.WriteBytes(buf)
 
-	hostCert := make([]byte, 1024+mrand.Intn(3092))
+	hostCert := make([]byte, 1024+mrand.Intn(3092)) // nolint: gosec
 	rand.Read(hostCert)                             // nolint: errcheck
 
 	recData := Record{
@@ -43,7 +44,8 @@ func (s ServerHello) WelcomePacket() []byte {
 		Version: Version12,
 		Data:    RawBytes(hostCert),
 	}
-	buf.Write(recData.Bytes())
+	recData.WriteBytes(buf)
+
 	packet := buf.Bytes()
 
 	mac := hmac.New(sha256.New, config.C.Secret)

utils/init_tcp.go

@@ -3,24 +3,26 @@ package utils
 import (
 	"fmt"
 	"net"
-
-	"github.com/9seconds/mtg/config"
 )
 
-func InitTCP(conn net.Conn) error {
+func InitTCP(conn net.Conn, readBufferSize int, writeBufferSize int) error {
 	tcpConn := conn.(*net.TCPConn)
 
 	if err := tcpConn.SetNoDelay(true); err != nil {
 		return fmt.Errorf("cannot set TCP_NO_DELAY: %w", err)
 	}
 
-	if err := tcpConn.SetReadBuffer(config.C.ReadBuffer); err != nil {
+	if err := tcpConn.SetReadBuffer(readBufferSize); err != nil {
 		return fmt.Errorf("cannot set read buffer size: %w", err)
 	}
 
-	if err := tcpConn.SetWriteBuffer(config.C.WriteBuffer); err != nil {
+	if err := tcpConn.SetWriteBuffer(writeBufferSize); err != nil {
 		return fmt.Errorf("cannot set write buffer size: %w", err)
 	}
 
+	if err := tcpConn.SetKeepAlive(true); err != nil {
+		return fmt.Errorf("cannot enable keep-alive: %w", err)
+	}
+
 	return nil
 }

utils/read_full.go

@@ -11,7 +11,7 @@ func ReadFull(src io.Reader) (rv []byte, err error) {
 	for n == len(buf) {
 		n, err = src.Read(buf)
 		if err != nil {
-			return nil, err
+			return nil, err // nolint: wrapcheck
 		}
 
 		rv = append(rv, buf[:n]...)

utils/stream_cipher.go

@@ -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)
 }

wrappers/packet/mtproto_frame.go

@@ -10,9 +10,8 @@ import (
 	"io/ioutil"
 	"net"
 
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )
 
 const (
@@ -41,8 +40,9 @@ type wrapperMtprotoFrame struct {
 	writeSeqNo int32
 }
 
-func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funlen
+func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funlen, cyclop
 	buf := &bytes.Buffer{}
+
 	sum := crc32.NewIEEE()
 	writer := io.MultiWriter(buf, sum)
 
@@ -71,7 +71,6 @@ func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funl
 	}
 
 	buf.Reset()
-	buf.Grow(int(messageLength) - 4 - 4)
 
 	if _, err := io.CopyN(writer, w.parent, int64(messageLength)-4-4); err != nil {
 		return nil, fmt.Errorf("cannot read the message frame: %w", err)
@@ -85,7 +84,7 @@ func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funl
 		return nil, fmt.Errorf("unexpected sequence number %d (wait for %d)", seqNo, w.readSeqNo)
 	}
 
-	data, _ := ioutil.ReadAll(buf) // nolint: gosec
+	data, _ := ioutil.ReadAll(buf)
 	buf.Reset()
 	// write to buf, not to writer. This is because we are going to fetch
 	// crc32 checksum.
@@ -114,7 +113,6 @@ func (w *wrapperMtprotoFrame) Write(p conntypes.Packet) error {
 	paddingLength := (aes.BlockSize - messageLength%aes.BlockSize) % aes.BlockSize
 
 	buf := &bytes.Buffer{}
-	buf.Grow(messageLength + paddingLength)
 
 	binary.Write(buf, binary.LittleEndian, uint32(messageLength)) // nolint: errcheck
 	binary.Write(buf, binary.LittleEndian, w.writeSeqNo)          // nolint: errcheck
@@ -134,7 +132,7 @@ 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 {

wrappers/packetack/client_abridged.go

@@ -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 (

wrappers/packetack/client_intermediate.go

@@ -7,9 +7,8 @@ import (
 	"io"
 	"net"
 
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )
 
 const clientIntermediateQuickAckLength = 0x80000000

wrappers/packetack/client_intermediate_secure.go

@@ -6,9 +6,8 @@ import (
 	"fmt"
 	"math/rand"
 
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )
 
 type wrapperClientIntermediateSecure struct {
@@ -35,11 +34,12 @@ func (w *wrapperClientIntermediateSecure) Write(packet conntypes.Packet, acks *c
 		return nil
 	}
 
-	buf := bytes.Buffer{}
+	buf := &bytes.Buffer{}
-	paddingLength := rand.Intn(4)
+	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

@@ -23,8 +23,8 @@ type wrapperProxy struct {
 
 func (w *wrapperProxy) Write(packet conntypes.Packet, acks *conntypes.ConnectionAcks) error {
 	buf := bytes.Buffer{}
-
 	flags := w.flags
+
 	if acks.Quick {
 		flags |= rpc.ProxyRequestFlagsQuickAck
 	}
@@ -43,6 +43,7 @@ func (w *wrapperProxy) Write(packet conntypes.Packet, acks *conntypes.Connection
 	buf.WriteByte(byte(len(config.C.AdTag)))
 	buf.Write(config.C.AdTag)
 	buf.Write(make([]byte, (4-buf.Len()%4)%4))
+	buf.Grow(len(packet))
 	buf.Write(packet)
 
 	return w.proxy.Write(buf.Bytes())
@@ -63,6 +64,7 @@ func (w *wrapperProxy) Read(acks *conntypes.ConnectionAcks) (conntypes.Packet, e
 
 func (w *wrapperProxy) Close() error {
 	w.proxy.Close()
+
 	return nil
 }
 
@@ -76,7 +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")
 	}
 

wrappers/rwc/ping.go

@@ -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) {
@@ -32,7 +32,7 @@ func (w *wrapperPing) Write(p []byte) (int, error) {
 		}
 	}
 
-	return n, err
+	return n, err // nolint: wrapcheck
 }
 
 func (w *wrapperPing) Close() error {

wrappers/stream/blockcipher.go

@@ -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 {

wrappers/stream/conn.go

@@ -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)
 	}
 
@@ -63,11 +64,12 @@ 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()
 }
 

wrappers/stream/ctx.go

@@ -6,9 +6,8 @@ import (
 	"net"
 	"time"
 
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )
 
 type wrapperCtx struct {
@@ -21,6 +20,7 @@ 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)
@@ -31,6 +31,7 @@ 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)
@@ -41,6 +42,7 @@ 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)
@@ -51,6 +53,7 @@ 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)
@@ -59,6 +62,7 @@ func (w *wrapperCtx) Read(p []byte) (int, error) {
 
 func (w *wrapperCtx) Close() error {
 	w.cancel()
+
 	return w.parent.Close()
 }
 

wrappers/stream/faketls.go

@@ -1,15 +1,15 @@
 package stream
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 	"net"
 	"time"
 
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
 	"github.com/9seconds/mtg/tlstypes"
+	"go.uber.org/zap"
 )
 
 type wrapperFakeTLS struct {
@@ -32,20 +32,25 @@ func (w *wrapperFakeTLS) WriteTimeout(p []byte, timeout time.Duration) (int, err
 		if elapsed > timeout {
 			return w.parent.WriteTimeout(b, timeout-elapsed)
 		}
+
 		return 0, errors.New("timeout")
 	})
 }
 
 func (w *wrapperFakeTLS) write(p []byte, writeFunc func([]byte) (int, error)) (int, error) {
 	sum := 0
+	buf := bytes.Buffer{}
 
 	for _, v := range tlstypes.MakeRecords(p) {
-		_, err := writeFunc(v.Bytes())
+		buf.Reset()
+		v.WriteBytes(&buf)
+
+		_, err := writeFunc(buf.Bytes())
 		if err != nil {
 			return sum, err
 		}
 
-		sum += len(v.Data.Bytes())
+		sum += v.Data.Len()
 	}
 
 	return sum, nil
@@ -80,13 +85,18 @@ 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 {
 			case tlstypes.RecordTypeChangeCipherSpec:
 			case tlstypes.RecordTypeApplicationData:
-				return rec.Data.Bytes(), nil
+				buf := &bytes.Buffer{}
+				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)
 			}

wrappers/stream/mtproto_cipher.go

@@ -4,8 +4,8 @@ import (
 	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
-	"crypto/md5"  // nolint: gosec
+	"crypto/md5"
-	"crypto/sha1" // nolint: gosec
+	"crypto/sha1"
 	"encoding/binary"
 	"net"
 
@@ -55,9 +55,10 @@ func mtprotoDeriveKeys(purpose mtprotoCipherPurpose,
 	client, remote *net.TCPAddr,
 	secret []byte) ([]byte, []byte) {
 	message := bytes.Buffer{}
-	message.Write(resp.Nonce)   // nolint: gosec
+
-	message.Write(req.Nonce)    // nolint: gosec
+	message.Write(resp.Nonce)
-	message.Write(req.CryptoTS) // nolint: gosec
+	message.Write(req.Nonce)
+	message.Write(req.CryptoTS)
 
 	clientIPv4 := mtprotoEmptyIP[:]
 	serverIPv4 := mtprotoEmptyIP[:]
@@ -67,34 +68,34 @@ 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(port[:])
-	message.Write(secret)     // nolint: gosec
+	message.Write(secret)
-	message.Write(resp.Nonce) // nolint: gosec
+	message.Write(resp.Nonce)
 
 	if client.IP.To4() == nil {
-		message.Write(client.IP.To16()) // nolint: gosec
+		message.Write(client.IP.To16())
-		message.Write(remote.IP.To16()) // nolint: gosec
+		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

wrappers/stream/obfuscated2.go

@@ -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])
@@ -40,16 +40,24 @@ func (w *wrapperObfuscated2) Read(p []byte) (int, error) {
 }
 
 func (w *wrapperObfuscated2) WriteTimeout(p []byte, timeout time.Duration) (int, error) {
-	buf := make([]byte, len(p))
+	buffer := bytes.Buffer{}
-	copy(buf, p)
+
+	buffer.Write(p)
+
+	buf := buffer.Bytes()
+
 	w.encryptor.XORKeyStream(buf, buf)
 
 	return w.parent.WriteTimeout(buf, timeout)
 }
 
 func (w *wrapperObfuscated2) Write(p []byte) (int, error) {
-	buf := make([]byte, len(p))
+	buffer := bytes.Buffer{}
-	copy(buf, p)
+
+	buffer.Write(p)
+
+	buf := buffer.Bytes()
+
 	w.encryptor.XORKeyStream(buf, buf)
 
 	return w.parent.Write(buf)

wrappers/stream/rewind.go

@@ -2,14 +2,14 @@ package stream
 
 import (
 	"bytes"
+	"errors"
 	"io"
 	"net"
 	"sync"
 	"time"
 
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )
 
 type ReadWriteCloseRewinder interface {
@@ -37,8 +37,8 @@ func (w *wrapperRewind) Read(p []byte) (int, error) {
 	defer w.mutex.Unlock()
 
 	if w.rewinded {
-		if n, err := w.buf.Read(p); err != io.EOF {
+		if n, err := w.buf.Read(p); errors.Is(err, io.EOF) {
-			return n, err
+			return n, err // nolint: wrapcheck
 		}
 	}
 
@@ -48,7 +48,7 @@ func (w *wrapperRewind) Read(p []byte) (int, error) {
 		w.buf.Write(p[:n])
 	}
 
-	return n, err
+	return n, err // nolint: wrapcheck
 }
 
 func (w *wrapperRewind) ReadTimeout(p []byte, timeout time.Duration) (int, error) {
@@ -56,8 +56,8 @@ func (w *wrapperRewind) ReadTimeout(p []byte, timeout time.Duration) (int, error
 	defer w.mutex.Unlock()
 
 	if w.rewinded {
-		if n, err := w.buf.Read(p); err != io.EOF {
+		if n, err := w.buf.Read(p); errors.Is(err, io.EOF) {
-			return n, err
+			return n, err // nolint: wrapcheck
 		}
 	}
 
@@ -67,7 +67,7 @@ func (w *wrapperRewind) ReadTimeout(p []byte, timeout time.Duration) (int, error
 		w.buf.Write(p[:n])
 	}
 
-	return n, err
+	return n, err // nolint: wrapcheck
 }
 
 func (w *wrapperRewind) Conn() net.Conn {
@@ -88,6 +88,7 @@ func (w *wrapperRewind) RemoteAddr() *net.TCPAddr {
 
 func (w *wrapperRewind) Close() error {
 	w.buf.Reset()
+
 	return w.parent.Close()
 }
 

wrappers/stream/stats_telegram.go

@@ -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 {
@@ -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 {

wrappers/stream/stats_traffic.go

@@ -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 {

wrappers/stream/timeout.go

@@ -4,9 +4,8 @@ import (
 	"net"
 	"time"
 
-	"go.uber.org/zap"
-
 	"github.com/9seconds/mtg/conntypes"
+	"go.uber.org/zap"
 )
 
 const (