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

Get rid of sync pools

.gitignore

@@ -9,3 +9,4 @@ mtg
 vendor/
 version.go
 ccbuilds/
+.bin/

.golangci.toml

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

.travis.yml

@@ -5,6 +5,8 @@ sudo: false
 dist: trusty
 
 go:
+  - 1.15.x
+  - 1.14.x
   - 1.13.x
   - 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 \
@@ -13,9 +13,9 @@ RUN set -x \
     upx
 
 COPY . /go/src/github.com/9seconds/mtg/
+WORKDIR /go/src/github.com/9seconds/mtg
 
 RUN set -x \
-  && cd /go/src/github.com/9seconds/mtg \
   && make -j 4 static \
   && upx --ultra-brute -qq ./mtg
 
@@ -26,11 +26,9 @@ 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 /go/src/github.com/9seconds/mtg/mtg /mtg

Makefile

@@ -4,7 +4,7 @@ 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 := v1.21.0
+GOLANGCI_LINT_VERSION := v1.31.0
 
 VERSION_GO         := $(shell go version)
 VERSION_DATE       := $(shell date -Ru)
@@ -53,7 +53,7 @@ crosscompile-dir:
 
 .PHONY: lint
 lint: vendor
-	@$(MOD_OFF) golangci-lint run
+	@$(MOD_OFF) "$(ROOT_DIR)/.bin/golangci-lint" run
 
 .PHONY: clean
 clean:
@@ -70,5 +70,6 @@ prepare: install-lint
 
 .PHONY: install-lint
 install-lint:
-	@curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh \
+	@mkdir -p ./bin || true && \
-		| $(MOD_OFF) bash -s -- -b $(GOPATH)/bin $(GOLANGCI_LINT_VERSION)
+		curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh \
+		| $(MOD_OFF) bash -s -- -b "$(ROOT_DIR)/.bin" $(GOLANGCI_LINT_VERSION)

README.md

@@ -159,6 +159,9 @@ by design and we have the negligible possibility of duplication
 (probability is 1/(2^64)) but it could be quite effective to prevent
 replays.
 
+It is possible to disable this cache. To do that, please explicitly set
+its size to 0.
+
 
 ## FakeTLS
 
@@ -191,11 +194,14 @@ supported environment variables:
 | `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`       | `65536`                           | 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`        | `131072`                          | 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

antireplay/cache.go

@@ -11,19 +11,19 @@ type cache struct {
 	data *fastcache.Cache
 }
 
-func (c *cache) AddObfuscated2(data []byte) {
+func (c cache) AddObfuscated2(data []byte) {
 	c.data.Set(keyObfuscated2(data), nil)
 }
 
-func (c *cache) AddTLS(data []byte) {
+func (c cache) AddTLS(data []byte) {
 	c.data.Set(keyTLS(data), nil)
 }
 
-func (c *cache) HasObfuscated2(data []byte) bool {
+func (c cache) HasObfuscated2(data []byte) bool {
 	return c.data.Has(keyObfuscated2(data))
 }
 
-func (c *cache) HasTLS(data []byte) bool {
+func (c cache) HasTLS(data []byte) bool {
 	return c.data.Has(keyTLS(data))
 }
 

antireplay/init.go

@@ -3,18 +3,28 @@ package antireplay
 import (
 	"sync"
 
+	"github.com/9seconds/mtg/config"
 	"github.com/VictoriaMetrics/fastcache"
-
-	"mtg/config"
 )
 
+type CacheInterface interface {
+	AddObfuscated2([]byte)
+	AddTLS([]byte)
+	HasObfuscated2([]byte) bool
+	HasTLS([]byte) bool
+}
+
 var (
-	Cache    cache
+	Cache    CacheInterface
 	initOnce sync.Once
 )
 
 func Init() {
 	initOnce.Do(func() {
-		Cache.data = fastcache.New(config.C.AntiReplayMaxSize)
+		if config.C.AntiReplayMaxSize == 0 {
+			Cache = nilCache{}
+		} else {
+			Cache = cache{fastcache.New(config.C.AntiReplayMaxSize)}
+		}
 	})
 }

antireplay/nilcache.go

@@ -0,0 +1,8 @@
+package antireplay
+
+type nilCache struct{}
+
+func (n nilCache) AddObfuscated2(_ []byte)      {}
+func (n nilCache) AddTLS(_ []byte)              {}
+func (n nilCache) HasObfuscated2(_ []byte) bool { return false }
+func (n nilCache) HasTLS(_ []byte) bool         { return false }

cli/generate.go

@@ -4,7 +4,7 @@ import (
 	"crypto/rand"
 	"encoding/hex"
 
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
 )
 
 func Generate(secretType, hostname string) {

cli/proxy.go

@@ -5,19 +5,18 @@ import (
 	"os"
 	"time"
 
+	"github.com/9seconds/mtg/antireplay"
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/faketls"
+	"github.com/9seconds/mtg/hub"
+	"github.com/9seconds/mtg/ntp"
+	"github.com/9seconds/mtg/obfuscated2"
+	"github.com/9seconds/mtg/proxy"
+	"github.com/9seconds/mtg/stats"
+	"github.com/9seconds/mtg/telegram"
+	"github.com/9seconds/mtg/utils"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
-
-	"mtg/antireplay"
-	"mtg/config"
-	"mtg/faketls"
-	"mtg/hub"
-	"mtg/ntp"
-	"mtg/obfuscated2"
-	"mtg/proxy"
-	"mtg/stats"
-	"mtg/telegram"
-	"mtg/utils"
 )
 
 func Proxy() error { // nolint: funlen
@@ -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()

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{}
@@ -105,6 +167,16 @@ func Init(options ...Opt) error { // nolint: gocyclo, funlen
 			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 {

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

@@ -2,23 +2,23 @@ package faketls
 
 import (
 	"bufio"
+	"bytes"
 	"encoding/binary"
 	"errors"
 	"fmt"
 	"io"
 	"net"
 	"strconv"
-	"sync"
 	"time"
 
-	"mtg/antireplay"
+	"github.com/9seconds/mtg/antireplay"
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/obfuscated2"
+	"github.com/9seconds/mtg/obfuscated2"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/protocol"
-	"mtg/stats"
+	"github.com/9seconds/mtg/stats"
-	"mtg/tlstypes"
+	"github.com/9seconds/mtg/tlstypes"
-	"mtg/wrappers/stream"
+	"github.com/9seconds/mtg/wrappers/stream"
 )
 
 type ClientProtocol struct {
@@ -49,8 +49,8 @@ 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
 	}
@@ -64,7 +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)
 	}
@@ -86,6 +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")
 	}
 
@@ -101,32 +105,16 @@ func (c *ClientProtocol) tlsHandshake(conn io.ReadWriter) error {
 }
 
 func (c *ClientProtocol) cloakHost(clientConn io.ReadWriteCloser) {
-	addr := net.JoinHostPort(config.C.CloakHost, strconv.Itoa(config.C.CloakPort))
+	stats.Stats.CloakedRequest()
-	hostConn, err := net.Dial("tcp", addr)
 
+	addr := net.JoinHostPort(config.C.CloakHost, strconv.Itoa(config.C.CloakPort))
+
+	hostConn, err := net.Dial("tcp", addr)
 	if err != nil {
 		return
 	}
 
-	defer hostConn.Close()
+	cloak(clientConn, hostConn)
-
-	wg := &sync.WaitGroup{}
-	wg.Add(2)
-
-	go c.pipe(hostConn, clientConn, wg)
-
-	go c.pipe(clientConn, hostConn, wg)
-
-	wg.Wait()
-}
-
-func (c *ClientProtocol) pipe(dst io.WriteCloser, src io.Reader, wg *sync.WaitGroup) {
-	defer func() {
-		wg.Done()
-		dst.Close()
-	}()
-
-	io.Copy(dst, src) // nolint: errcheck
 }
 
 func MakeClientProtocol() protocol.ClientProtocol {

faketls/cloak.go

@@ -0,0 +1,73 @@
+package faketls
+
+import (
+	"context"
+	"io"
+	"sync"
+	"time"
+
+	"github.com/9seconds/mtg/wrappers/rwc"
+)
+
+const (
+	cloakLastActivityTimeout = 5 * time.Second
+	cloakMaxTimeout          = 30 * time.Second
+)
+
+func cloak(one, another io.ReadWriteCloser) {
+	defer func() {
+		one.Close()
+		another.Close()
+	}()
+
+	channelPing := make(chan struct{}, 1)
+	ctx, cancel := context.WithCancel(context.Background())
+	one = rwc.NewPing(ctx, one, channelPing)
+	another = rwc.NewPing(ctx, another, channelPing)
+	wg := &sync.WaitGroup{}
+
+	wg.Add(2)
+
+	go cloakPipe(one, another, wg)
+
+	go cloakPipe(another, one, wg)
+
+	go func() {
+		wg.Wait()
+		cancel()
+	}()
+
+	go func() {
+		lastActivityTimer := time.NewTimer(cloakLastActivityTimeout)
+		defer lastActivityTimer.Stop()
+
+		maxTimer := time.NewTimer(cloakMaxTimeout)
+		defer maxTimer.Stop()
+
+		for {
+			select {
+			case <-channelPing:
+				lastActivityTimer.Stop()
+				lastActivityTimer = time.NewTimer(cloakLastActivityTimeout)
+			case <-ctx.Done():
+				return
+			case <-lastActivityTimer.C:
+				cancel()
+
+				return
+			case <-maxTimer.C:
+				cancel()
+
+				return
+			}
+		}
+	}()
+
+	<-ctx.Done()
+}
+
+func cloakPipe(one io.Writer, another io.Reader, wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	io.Copy(one, another) // nolint: errcheck
+}

go.mod

@@ -1,20 +1,22 @@
-module mtg
+module github.com/9seconds/mtg
 
 go 1.13
 
 require (
-	github.com/VictoriaMetrics/fastcache v1.5.2
+	github.com/VictoriaMetrics/fastcache v1.5.7
 	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d
-	github.com/beevik/ntp v0.2.0
+	github.com/beevik/ntp v0.3.0
-	github.com/cespare/xxhash/v2 v2.1.1 // indirect
+	github.com/prometheus/client_golang v1.7.1
-	github.com/prometheus/client_golang v1.2.1
+	github.com/prometheus/common v0.13.0 // indirect
-	github.com/prometheus/procfs v0.0.7 // indirect
 	github.com/smira/go-statsd v1.3.1
-	go.uber.org/multierr v1.4.0 // indirect
+	go.uber.org/multierr v1.6.0 // indirect
-	go.uber.org/zap v1.13.0
+	go.uber.org/zap v1.16.0
-	golang.org/x/crypto v0.0.0-20191117063200-497ca9f6d64f
+	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
-	golang.org/x/net v0.0.0-20191116160921-f9c825593386 // indirect
+	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
-	golang.org/x/sys v0.0.0-20191118013547-6254a7c3cac6
+	golang.org/x/net v0.0.0-20200904194848-62affa334b73 // indirect
-	golang.org/x/tools v0.0.0-20191118051429-5a76f03bc7c3 // indirect
+	golang.org/x/sys v0.0.0-20200918174421-af09f7315aff
+	golang.org/x/tools v0.0.0-20200319210407-521f4a0cd458 // 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

@@ -1,9 +1,14 @@
+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/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
-github.com/OneOfOne/xxhash v1.2.5/go.mod h1:eZbhyaAYD41SGSSsnmcpxVoRiQ/MPUTjUdIIOT9Um7Q=
+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
-github.com/VictoriaMetrics/fastcache v1.5.2 h1:Erd8iIuBAL9kke8JzM4+WxkKuFkHh3ktwLanJvDgR44=
+github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
-github.com/VictoriaMetrics/fastcache v1.5.2/go.mod h1:+jv9Ckb+za/P1ZRg/sulP5Ni1v49daAVERr0H3CuscE=
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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

@@ -4,15 +4,17 @@ import (
 	"fmt"
 	"math/rand"
 	"sync"
+	"time"
 
+	"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"
-
-	"mtg/conntypes"
-	"mtg/mtproto"
-	"mtg/mtproto/rpc"
-	"mtg/protocol"
 )
 
+const connectionTTL = time.Hour
+
 type connection struct {
 	conn            conntypes.PacketReadWriteCloser
 	proxyConns      map[string]*ProxyConn
@@ -31,6 +33,9 @@ type connection struct {
 func (c *connection) run() {
 	defer c.Close()
 
+	ttl := time.NewTimer(connectionTTL)
+	defer ttl.Stop()
+
 	for {
 		select {
 		case <-c.channelDone:
@@ -39,6 +44,9 @@ func (c *connection) run() {
 			}
 
 			return
+		case <-ttl.C:
+			c.logger.Debugw("Closing connection by TTL")
+			c.Close()
 		case resp := <-c.channelRead:
 			if channel, ok := c.proxyConns[string(resp.ConnID[:])]; ok {
 				if resp.Type == rpc.ProxyResponseTypeCloseExt {
@@ -81,6 +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

@@ -4,18 +4,14 @@ import (
 	"fmt"
 	"sort"
 
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
 )
 
 type connectionList struct {
 	connections []*connection
 }
 
-func (c *connectionList) Get(conn *ProxyConn) (*connection, error) {
+func (c *connectionList) get(conn *ProxyConn) (*connection, error) {
-	if len(c.connections) > 0 {
-		c.gc()
-	}
-
 	if len(c.connections) > 0 && c.connections[0].Len() < config.C.MultiplexPerConnection {
 		if err := c.connections[0].Attach(conn); err == nil {
 			return c.connections[0], nil
@@ -29,6 +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)
 	}
 
@@ -41,6 +38,9 @@ func (c *connectionList) Get(conn *ProxyConn) (*connection, error) {
 
 func (c *connectionList) gc() {
 	prevLen := len(c.connections)
+	if prevLen == 0 {
+		return
+	}
 
 	for i := len(c.connections) - 1; i >= 0; i-- {
 		lastIndex := len(c.connections) - 1

hub/hub.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"sync"
 
-	"mtg/protocol"
+	"github.com/9seconds/mtg/protocol"
 )
 
 type hub struct {

hub/interface.go

@@ -1,6 +1,6 @@
 package hub
 
-import "mtg/protocol"
+import "github.com/9seconds/mtg/protocol"
 
 type Interface interface {
 	Register(*protocol.TelegramRequest) (*ProxyConn, error)

hub/mux.go

@@ -2,11 +2,14 @@ package hub
 
 import (
 	"context"
+	"time"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/protocol"
 )
 
+const muxGCEvery = time.Minute
+
 type muxNewRequest struct {
 	req  *protocol.TelegramRequest
 	resp chan<- muxNewResponse
@@ -26,6 +29,9 @@ type mux struct {
 }
 
 func (m *mux) run() {
+	gcTicker := time.NewTicker(muxGCEvery)
+	defer gcTicker.Stop()
+
 	for {
 		select {
 		case <-m.ctx.Done():
@@ -34,9 +40,12 @@ func (m *mux) run() {
 			}
 
 			return
+		case <-gcTicker.C:
+			m.connections.gc()
 		case req := <-m.channelNew:
+			m.connections.gc()
 			proxyConn := newProxyConn(req.req, m.channelClosed)
-			conn, err := m.connections.Get(proxyConn)
+			conn, err := m.connections.get(proxyConn)
 
 			if err == nil {
 				m.clients[string(req.req.ConnID[:])] = conn

hub/proxy_conn.go

@@ -4,9 +4,9 @@ import (
 	"sync"
 	"time"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/mtproto/rpc"
+	"github.com/9seconds/mtg/mtproto/rpc"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/protocol"
 )
 
 const (

main.go

@@ -3,16 +3,17 @@ 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"
-
-	"mtg/cli"
-	"mtg/config"
-	"mtg/utils"
 )
 
-var version = "dev" // this has to be set by build ld flags
+var version = "dev" // has to be set by ldflags
 
 var (
 	app = kingpin.New("mtg", "Simple MTPROTO proxy.")
@@ -41,6 +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').
@@ -85,13 +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.").
@@ -108,13 +114,18 @@ 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()
 )
 
 func main() {
 	rand.Seed(time.Now().UTC().UnixNano())
-	app.Version(version)
+	app.Version(getVersion())
 	app.HelpFlag.Short('h')
 
 	if err := utils.SetLimits(); err != nil {
@@ -128,6 +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},
@@ -141,6 +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},
 		)
@@ -153,3 +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

@@ -3,12 +3,12 @@ package mtproto
 import (
 	"fmt"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/mtproto/rpc"
+	"github.com/9seconds/mtg/mtproto/rpc"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/protocol"
-	"mtg/telegram"
+	"github.com/9seconds/mtg/telegram"
-	"mtg/wrappers/packet"
+	"github.com/9seconds/mtg/wrappers/packet"
-	"mtg/wrappers/stream"
+	"github.com/9seconds/mtg/wrappers/stream"
 )
 
 func TelegramProtocol(req *protocol.TelegramRequest) (conntypes.PacketReadWriteCloser, error) {
@@ -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)
 	}

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()
 }

mtproto/rpc/proxy_response.go

@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"fmt"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type ProxyResponseType uint8

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

@@ -9,13 +9,13 @@ import (
 	"io"
 	"time"
 
-	"mtg/antireplay"
+	"github.com/9seconds/mtg/antireplay"
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/protocol"
-	"mtg/stats"
+	"github.com/9seconds/mtg/stats"
-	"mtg/utils"
+	"github.com/9seconds/mtg/utils"
-	"mtg/wrappers/stream"
+	"github.com/9seconds/mtg/wrappers/stream"
 )
 
 const clientProtocolHandshakeTimeout = 10 * time.Second
@@ -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
 }

obfuscated2/telegram_protocol.go

@@ -4,11 +4,11 @@ import (
 	"crypto/rand"
 	"fmt"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/protocol"
-	"mtg/telegram"
+	"github.com/9seconds/mtg/telegram"
-	"mtg/utils"
+	"github.com/9seconds/mtg/utils"
-	"mtg/wrappers/stream"
+	"github.com/9seconds/mtg/wrappers/stream"
 )
 
 func TelegramProtocol(req *protocol.TelegramRequest) (conntypes.StreamReadWriteCloser, error) {

protocol/interfaces.go

@@ -1,6 +1,6 @@
 package protocol
 
-import "mtg/conntypes"
+import "github.com/9seconds/mtg/conntypes"
 
 type ClientProtocol interface {
 	Handshake(conntypes.StreamReadWriteCloser) (conntypes.StreamReadWriteCloser, error)

protocol/request.go

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

proxy/direct.go

@@ -4,14 +4,13 @@ import (
 	"io"
 	"sync"
 
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/obfuscated2"
+	"github.com/9seconds/mtg/protocol"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
-	"mtg/obfuscated2"
-	"mtg/protocol"
 )
 
-const directPipeBufferSize = 1024 * 1024
+const directPipeBufferSize = 1024
 
 func directConnection(request *protocol.TelegramRequest) error {
 	telegramConnRaw, err := obfuscated2.TelegramProtocol(request)
@@ -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"
 
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/protocol"
+	"github.com/9seconds/mtg/wrappers/packetack"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
-	"mtg/protocol"
-	"mtg/wrappers/packetack"
 )
 
 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"
 
+	"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"
-
-	"mtg/config"
-	"mtg/conntypes"
-	"mtg/protocol"
-	"mtg/stats"
-	"mtg/utils"
-	"mtg/wrappers/stream"
 )
 
 type Proxy struct {
@@ -30,8 +29,7 @@ func (p *Proxy) Serve(listener net.Listener) {
 			case <-doneChan:
 				return
 			default:
-				p.Logger.Errorw("Cannot allocate incoming connection", "error", err)
+				p.Logger.Fatalw("Cannot allocate incoming connection", "error", err)
-				continue
 			}
 		}
 
@@ -42,6 +40,7 @@ func (p *Proxy) Serve(listener net.Listener) {
 func (p *Proxy) accept(conn net.Conn) {
 	defer func() {
 		conn.Close()
+
 		if err := recover(); err != nil {
 			stats.Stats.Crash()
 			p.Logger.Errorw("Crash of accept handler", "error", err)
@@ -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
 	}
 
@@ -66,10 +66,12 @@ 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)
+
 		return
 	}
 
@@ -88,7 +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)

run.sh

@@ -11,48 +11,58 @@
 #   export MTG_IMAGENAME="nineseconds/mtg:latest"
 #   curl -sfL --compressed https://raw.githubusercontent.com/9seconds/mtg/master/run.sh | bash
 
-set -eu -o pipefail
+set -eu
 
 export XDG_CONFIG_HOME="${XDG_CONFIG_HOME:-$HOME/.config}"
 export MTG_CONFIG="${MTG_CONFIG:-$XDG_CONFIG_HOME/mtg}"
 
+if ! [ -x "$(command -v docker)" ]; then
+    echo 'Error: docker is not installed.' >&2
+    exit 1
+fi
+
+id -Gn "$USER" | grep -qw 'docker' > /dev/null
+if [ $? -eq 0 ] || [ "$(id -u)" -eq '0' ]; then
+    DOCKER_CMD="$(command -v docker)"
+else
+    DOCKER_CMD="sudo $(command -v docker)"
+fi
+
 mkdir -p "$MTG_CONFIG" || true
 
 MTG_SECRET="$MTG_CONFIG/secret"
 MTG_ENV="$MTG_CONFIG/env"
 
 if [ ! -f "$MTG_ENV" ]; then
-    MTG_IMAGENAME="${MTG_IMAGENAME:-nineseconds/mtg:latest}"
+    MTG_IMAGENAME="${MTG_IMAGENAME:-nineseconds/mtg:stable}"
     MTG_PORT="${MTG_PORT:-3128}"
     MTG_CONTAINER="${MTG_CONTAINER:-mtg}"
 
-    echo "MTG_IMAGENAME=${MTG_IMAGENAME}" > "$MTG_ENV"
+    echo "MTG_IMAGENAME=$MTG_IMAGENAME" > "$MTG_ENV"
-    echo "MTG_PORT=${MTG_PORT}" >> "$MTG_ENV"
+    echo "MTG_PORT=$MTG_PORT" >> "$MTG_ENV"
-    echo "MTG_CONTAINER=${MTG_CONTAINER}" >> "$MTG_ENV"
+    echo "MTG_CONTAINER=$MTG_CONTAINER" >> "$MTG_ENV"
 fi
 
 set -a
 source "$MTG_ENV"
 set +a
 
-docker pull "$MTG_IMAGENAME"
+$DOCKER_CMD pull "$MTG_IMAGENAME" > /dev/null
 if [ ! -f "$MTG_SECRET" ]; then
-    docker run \
+    $DOCKER_CMD run \
             --rm \
             "$MTG_IMAGENAME" \
         generate-secret tls -c "$(openssl rand -hex 16).com" \
     > "$MTG_SECRET"
 fi
 
-echo
 echo "Proxy secret is $(cat "$MTG_SECRET"). Port is $MTG_PORT."
-echo
 
-docker ps --filter "Name=$MTG_CONTAINER" -aq | xargs -r docker rm -fv
+$DOCKER_CMD ps --filter "Name=$MTG_CONTAINER" -aq | xargs -r $DOCKER_CMD rm -fv > /dev/null
-docker run \
+$DOCKER_CMD run \
         -d \
         --restart=unless-stopped \
         --name "$MTG_CONTAINER" \
         --ulimit nofile=51200:51200 \
         -p "$MTG_PORT:3128" \
-    "$MTG_IMAGENAME" run "$(cat "$MTG_SECRET")"
+    "$MTG_IMAGENAME" run "$(cat "$MTG_SECRET")" > /dev/null

stats/interfaces.go

@@ -3,7 +3,7 @@ package stats
 import (
 	"net"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type IngressTrafficInterface interface {
@@ -38,6 +38,14 @@ type ReplayDetectedInterface interface {
 	ReplayDetected()
 }
 
+type AuthenticationFailedInterface interface {
+	AuthenticationFailed()
+}
+
+type CloakedRequestInterface interface {
+	CloakedRequest()
+}
+
 type Interface interface {
 	IngressTrafficInterface
 	EgressTrafficInterface
@@ -47,4 +55,6 @@ type Interface interface {
 	TelegramDisconnectedInterface
 	CrashInterface
 	ReplayDetectedInterface
+	AuthenticationFailedInterface
+	CloakedRequestInterface
 }

stats/multi_stats.go

@@ -3,7 +3,7 @@ package stats
 import (
 	"net"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type multiStats []Interface
@@ -55,3 +55,15 @@ func (m multiStats) ReplayDetected() {
 		go m[i].ReplayDetected()
 	}
 }
+
+func (m multiStats) AuthenticationFailed() {
+	for i := range m {
+		go m[i].AuthenticationFailed()
+	}
+}
+
+func (m multiStats) CloakedRequest() {
+	for i := range m {
+		go m[i].CloakedRequest()
+	}
+}

stats/stats.go

@@ -6,7 +6,7 @@ import (
 	"net"
 	"net/http"
 
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
 )
 
 var Stats Interface

stats/stats_prometheus.go

@@ -5,19 +5,20 @@ import (
 	"net/http"
 	"strconv"
 
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/conntypes"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-
-	"mtg/config"
-	"mtg/conntypes"
 )
 
 type statsPrometheus struct {
-	connections         *prometheus.GaugeVec
+	connections          *prometheus.GaugeVec
-	telegramConnections *prometheus.GaugeVec
+	telegramConnections  *prometheus.GaugeVec
-	traffic             *prometheus.GaugeVec
+	traffic              *prometheus.GaugeVec
-	crashes             prometheus.Counter
+	crashes              prometheus.Counter
-	replayAttacks       prometheus.Counter
+	replayAttacks        prometheus.Counter
+	authenticationFailed prometheus.Counter
+	cloakedRequests      prometheus.Counter
 }
 
 func (s *statsPrometheus) IngressTraffic(traffic int) {
@@ -49,10 +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)
@@ -87,6 +92,14 @@ func (s *statsPrometheus) ReplayDetected() {
 	s.replayAttacks.Inc()
 }
 
+func (s *statsPrometheus) AuthenticationFailed() {
+	s.authenticationFailed.Inc()
+}
+
+func (s *statsPrometheus) CloakedRequest() {
+	s.cloakedRequests.Inc()
+}
+
 func newStatsPrometheus(mux *http.ServeMux) Interface {
 	registry := prometheus.NewPedanticRegistry()
 
@@ -116,6 +129,16 @@ func newStatsPrometheus(mux *http.ServeMux) Interface {
 			Name:      "replay_attacks",
 			Help:      "How many replay attacks were prevented.",
 		}),
+		authenticationFailed: prometheus.NewCounter(prometheus.CounterOpts{
+			Namespace: config.C.StatsNamespace,
+			Name:      "authentication_failed",
+			Help:      "How many authentication failed events we've seen.",
+		}),
+		cloakedRequests: prometheus.NewCounter(prometheus.CounterOpts{
+			Namespace: config.C.StatsNamespace,
+			Name:      "cloaked_requests",
+			Help:      "How many requests were proxified during cloaking.",
+		}),
 	}
 
 	registry.MustRegister(instance.connections)
@@ -123,6 +146,8 @@ func newStatsPrometheus(mux *http.ServeMux) Interface {
 	registry.MustRegister(instance.traffic)
 	registry.MustRegister(instance.crashes)
 	registry.MustRegister(instance.replayAttacks)
+	registry.MustRegister(instance.authenticationFailed)
+	registry.MustRegister(instance.cloakedRequests)
 
 	handler := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
 	mux.Handle("/", handler)

stats/stats_statsd.go

@@ -8,11 +8,10 @@ import (
 	"sync"
 	"time"
 
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/conntypes"
 	statsd "github.com/smira/go-statsd"
 	"go.uber.org/zap"
-
-	"mtg/config"
-	"mtg/conntypes"
 )
 
 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 {
@@ -137,6 +138,14 @@ func (s *statsStatsd) ReplayDetected() {
 	s.gauge("replay_attacks", 1)
 }
 
+func (s *statsStatsd) AuthenticationFailed() {
+	s.gauge("authentication_failed", 1)
+}
+
+func (s *statsStatsd) CloakedRequest() {
+	s.gauge("cloaked_requests", 1)
+}
+
 func (s *statsStatsd) gauge(metric string, value int64, tags ...*statsStatsdTag) {
 	key, tagList := s.prepareVals(metric, tags)
 	s.initGauge(metric, key, tagList)

telegram/api/addresses.go

@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 const (

telegram/api/api.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -9,7 +10,7 @@ import (
 )
 
 const (
-	apiUserAgent   = "mtg"
+	apiUserAgent   = "github.com/9seconds/mtg"
 	apiHTTPTimeout = 30 * time.Second
 )
 
@@ -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)
 	}

telegram/base.go

@@ -1,21 +1,24 @@
 package telegram
 
 import (
-	"fmt"
+	"errors"
 	"math/rand"
 	"net"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/config"
-	"mtg/utils"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/wrappers/stream"
+	"github.com/9seconds/mtg/utils"
+	"github.com/9seconds/mtg/wrappers/stream"
+	"go.uber.org/zap"
 )
 
 type baseTelegram struct {
 	dialer net.Dialer
+	logger *zap.SugaredLogger
 
 	secret      []byte
 	v4DefaultDC conntypes.DC
-	V6DefaultDC conntypes.DC
+	v6DefaultDC conntypes.DC
 	v4Addresses map[conntypes.DC][]string
 	v6Addresses map[conntypes.DC][]string
 }
@@ -26,25 +29,48 @@ func (b *baseTelegram) Secret() []byte {
 
 func (b *baseTelegram) dial(dc conntypes.DC,
 	protocol conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error) {
-	addr := ""
+	for _, addr := range b.getAddresses(dc, protocol) {
+		conn, err := b.dialer.Dial("tcp", addr)
+		if err != nil {
+			b.logger.Infow("Cannot dial to Telegram", "address", addr, "error", err)
 
-	switch protocol {
+			continue
-	case conntypes.ConnectionProtocolIPv4:
+		}
-		addr = b.chooseAddress(b.v4Addresses, dc, b.v4DefaultDC)
+
-	default:
+		if err := utils.InitTCP(conn, config.C.ProxyReadBuffer(), config.C.ProxyWriteBuffer()); err != nil {
-		addr = b.chooseAddress(b.v6Addresses, dc, b.V6DefaultDC)
+			b.logger.Infow("Cannot initialize TCP socket", "address", addr, "error", err)
+
+			continue
+		}
+
+		return stream.NewTelegramConn(dc, conn), nil
 	}
 
-	conn, err := b.dialer.Dial("tcp", addr)
+	return nil, errors.New("cannot dial to the chosen DC")
-	if err != nil {
+}
-		return nil, fmt.Errorf("dial has failed: %w", err)
+
+func (b *baseTelegram) getAddresses(dc conntypes.DC, protocol conntypes.ConnectionProtocol) []string {
+	addresses := make([]string, 0, 2)
+	protos := []conntypes.ConnectionProtocol{
+		conntypes.ConnectionProtocolIPv6,
+		conntypes.ConnectionProtocolIPv4,
 	}
 
-	if err := utils.InitTCP(conn); err != nil {
+	if config.C.PreferIP == config.PreferIPv4 {
-		return nil, fmt.Errorf("cannot initialize tcp socket: %w", err)
+		protos[0], protos[1] = protos[1], protos[0]
 	}
 
-	return stream.NewTelegramConn(dc, conn), nil
+	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,
@@ -58,7 +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/direct.go

@@ -1,6 +1,6 @@
 package telegram
 
-import "mtg/conntypes"
+import "github.com/9seconds/mtg/conntypes"
 
 const (
 	directV4DefaultIdx conntypes.DC = 1
@@ -37,5 +37,5 @@ func (d *directTelegram) Dial(dc conntypes.DC,
 		dc = conntypes.DCDefaultIdx
 	}
 
-	return d.baseTelegram.dial(dc-1, protocol)
+	return d.baseTelegram.dial(dc-1, conntypes.ConnectionProtocolAny)
 }

telegram/init.go

@@ -4,6 +4,8 @@ import (
 	"net"
 	"sync"
 	"time"
+
+	"go.uber.org/zap"
 )
 
 const telegramDialTimeout = 10 * time.Second
@@ -17,11 +19,14 @@ var (
 
 func Init() {
 	initOnce.Do(func() {
+		logger := zap.S().Named("telegram")
+
 		Direct = &directTelegram{
 			baseTelegram: baseTelegram{
 				dialer:      net.Dialer{Timeout: telegramDialTimeout},
+				logger:      logger.Named("direct"),
 				v4DefaultDC: directV4DefaultIdx,
-				V6DefaultDC: directV6DefaultIdx,
+				v6DefaultDC: directV6DefaultIdx,
 				v4Addresses: directV4Addresses,
 				v6Addresses: directV6Addresses,
 			},
@@ -30,6 +35,7 @@ func Init() {
 		tg := &middleTelegram{
 			baseTelegram: baseTelegram{
 				dialer: net.Dialer{Timeout: telegramDialTimeout},
+				logger: logger.Named("middle"),
 			},
 		}
 		if err := tg.update(); err != nil {

telegram/interfaces.go

@@ -1,6 +1,6 @@
 package telegram
 
-import "mtg/conntypes"
+import "github.com/9seconds/mtg/conntypes"
 
 type Telegram interface {
 	Dial(conntypes.DC, conntypes.ConnectionProtocol) (conntypes.StreamReadWriteCloser, error)

telegram/middle.go

@@ -5,10 +5,9 @@ import (
 	"sync"
 	"time"
 
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/telegram/api"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
-	"mtg/telegram/api"
 )
 
 const middleTelegramBackgroundUpdateEvery = time.Hour
@@ -45,7 +44,7 @@ func (m *middleTelegram) update() error {
 	m.mutex.Lock()
 	m.secret = secret
 	m.v4DefaultDC = v4DefaultDC
-	m.V6DefaultDC = v6DefaultDC
+	m.v6DefaultDC = v6DefaultDC
 	m.v4Addresses = v4Addresses
 	m.v6Addresses = v6Addresses
 	m.mutex.Unlock()

tlstypes/client_hello.go

@@ -6,8 +6,8 @@ import (
 	"crypto/sha256"
 	"fmt"
 
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
-	"mtg/utils"
+	"github.com/9seconds/mtg/utils"
 )
 
 type ClientHello struct {
@@ -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
-	CipherSuiteType_TLS_AES_256_GCM_SHA384                              // nolint: stylecheck, golint
+	CipherSuiteType_TLS_AES_256_GCM_SHA384                              // nolint: stylecheck,golint
-	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256                        // nolint: stylecheck, golint
+	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256                        // nolint: stylecheck,golint
 )
 
 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
-	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
-	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes = []byte{0x13, 0x03} // nolint; stylecheck, golint
+	CipherSuiteType_TLS_CHACHA20_POLY1305_SHA256_Bytes = []byte{0x13, 0x03} // nolint: stylecheck,golint
 )
 
 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

@@ -2,8 +2,9 @@ package tlstypes
 
 import (
 	"bytes"
+	"io"
 
-	"mtg/utils"
+	"github.com/9seconds/mtg/utils"
 )
 
 type Handshake struct {
@@ -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"
 
+	"github.com/9seconds/mtg/config"
 	"golang.org/x/crypto/curve25519"
-
-	"mtg/config"
 )
 
 type ServerHello struct {
@@ -20,30 +19,33 @@ 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
+	rand.Read(hostCert)                             // nolint: errcheck
 
 	recData := Record{
 		Type:    RecordTypeApplicationData,
 		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"
-
-	"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/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"
 
+	"github.com/9seconds/mtg/conntypes"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
 )
 
 const (
@@ -43,6 +42,7 @@ type wrapperMtprotoFrame struct {
 
 func (w *wrapperMtprotoFrame) Read() (conntypes.Packet, error) { // nolint: funlen
 	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

wrappers/packetack/client_abridged.go

@@ -6,10 +6,9 @@ import (
 	"io"
 	"net"
 
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/utils"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
-	"mtg/utils"
 )
 
 const (

wrappers/packetack/client_intermediate.go

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

wrappers/packetack/client_intermediate_secure.go

@@ -6,9 +6,8 @@ import (
 	"fmt"
 	"math/rand"
 
+	"github.com/9seconds/mtg/conntypes"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
 )
 
 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

@@ -6,11 +6,11 @@ import (
 	"fmt"
 	"net"
 
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/hub"
+	"github.com/9seconds/mtg/hub"
-	"mtg/mtproto/rpc"
+	"github.com/9seconds/mtg/mtproto/rpc"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/protocol"
 )
 
 type wrapperProxy struct {
@@ -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

@@ -0,0 +1,48 @@
+package rwc
+
+import (
+	"context"
+	"io"
+)
+
+type wrapperPing struct {
+	parent      io.ReadWriteCloser
+	ctx         context.Context
+	channelPing chan<- struct{}
+}
+
+func (w *wrapperPing) Read(p []byte) (int, error) {
+	n, err := w.parent.Read(p)
+	if err == nil {
+		select {
+		case <-w.ctx.Done():
+		case w.channelPing <- struct{}{}:
+		}
+	}
+
+	return n, err
+}
+
+func (w *wrapperPing) Write(p []byte) (int, error) {
+	n, err := w.parent.Write(p)
+	if err == nil {
+		select {
+		case <-w.ctx.Done():
+		case w.channelPing <- struct{}{}:
+		}
+	}
+
+	return n, err
+}
+
+func (w *wrapperPing) Close() error {
+	return w.parent.Close()
+}
+
+func NewPing(ctx context.Context, parent io.ReadWriteCloser, channelPing chan<- struct{}) io.ReadWriteCloser {
+	return &wrapperPing{
+		parent:      parent,
+		ctx:         ctx,
+		channelPing: channelPing,
+	}
+}

wrappers/stream/base.go

@@ -3,7 +3,7 @@ package stream
 import (
 	"net"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 func NewClientConn(parent net.Conn, connID conntypes.ConnID) conntypes.StreamReadWriteCloser {

wrappers/stream/blockcipher.go

@@ -7,10 +7,9 @@ import (
 	"net"
 	"time"
 
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/utils"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
-	"mtg/utils"
 )
 
 type wrapperBlockCipher struct {

wrappers/stream/conn.go

@@ -5,10 +5,9 @@ import (
 	"net"
 	"time"
 
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/conntypes"
 	"go.uber.org/zap"
-
-	"mtg/config"
-	"mtg/conntypes"
 )
 
 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)
 	}
 
@@ -40,7 +40,7 @@ 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
@@ -49,6 +49,7 @@ func (w *wrapperConn) Write(p []byte) (int, error) {
 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)
 	}
 
@@ -68,6 +69,7 @@ func (w *wrapperConn) Read(p []byte) (int, error) {
 
 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"
 
+	"github.com/9seconds/mtg/conntypes"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
 )
 
 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"
 
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/tlstypes"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
-	"mtg/tlstypes"
 )
 
 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
@@ -86,7 +91,12 @@ func NewFakeTLS(socket conntypes.StreamReadWriteCloser) conntypes.StreamReadWrit
 			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

@@ -4,14 +4,14 @@ import (
 	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
-	"crypto/md5"  // nolint: gosec
+	"crypto/md5"
-	"crypto/sha1" // nolint: gosec
+	"crypto/sha1"
 	"encoding/binary"
 	"net"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
-	"mtg/mtproto/rpc"
+	"github.com/9seconds/mtg/mtproto/rpc"
-	"mtg/utils"
+	"github.com/9seconds/mtg/utils"
 )
 
 type mtprotoCipherPurpose uint8
@@ -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"
 
+	"github.com/9seconds/mtg/conntypes"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
 )
 
 type wrapperObfuscated2 struct {
@@ -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

@@ -7,9 +7,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/9seconds/mtg/conntypes"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
 )
 
 type ReadWriteCloseRewinder interface {
@@ -88,6 +87,7 @@ 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"
 
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/stats"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
-	"mtg/stats"
 )
 
 type wrapperTelegramStats struct {

wrappers/stream/stats_traffic.go

@@ -4,10 +4,9 @@ import (
 	"net"
 	"time"
 
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/stats"
 	"go.uber.org/zap"
-
-	"mtg/conntypes"
-	"mtg/stats"
 )
 
 type wrapperTrafficStats struct {

wrappers/stream/timeout.go

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