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

Add possibility to define your own ntp servers

.golangci.toml

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

.travis.yml

@@ -17,3 +17,4 @@ script:
 matrix:
   allow_failures:
     - go: master
+    - go: 1.14.x  # because of golangci-lint

Dockerfile

@@ -1,7 +1,7 @@
 ###############################################################################
 # BUILD STAGE
 
-FROM golang:1.13-alpine
+FROM golang:1.14-alpine
 
 RUN set -x \
   && apk --no-cache --update add \

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 := v1.24.0
 
 VERSION_GO         := $(shell go version)
 VERSION_DATE       := $(shell date -Ru)

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
 
@@ -191,8 +194,8 @@ 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_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_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_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_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                                                                                                                                                                                                |

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

@@ -5,16 +5,27 @@ import (
 
 	"github.com/VictoriaMetrics/fastcache"
 
-	"mtg/config"
+	"github.com/9seconds/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

@@ -8,16 +8,16 @@ import (
 	"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"
+	"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"
 )
 
 func Proxy() error { // nolint: funlen

config/config.go

@@ -32,6 +32,13 @@ const (
 	SecretModeTLS
 )
 
+type PreferIP uint8
+
+const (
+	PreferIPv4 PreferIP = iota
+	PreferIPv6
+)
+
 const SimpleSecretLength = 16
 
 type OptionType uint8
@@ -40,6 +47,8 @@ const (
 	OptionTypeDebug OptionType = iota
 	OptionTypeVerbose
 
+	OptionTypePreferIP
+
 	OptionTypeBind
 	OptionTypePublicIPv4
 	OptionTypePublicIPv6
@@ -59,6 +68,8 @@ const (
 
 	OptionTypeMultiplexPerConnection
 
+	OptionTypeNTPServers
+
 	OptionTypeSecret
 	OptionTypeAdtag
 )
@@ -86,6 +97,8 @@ 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"`
@@ -105,6 +118,16 @@ 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 +168,11 @@ 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:

faketls/client_protocol.go

@@ -8,17 +8,16 @@ import (
 	"io"
 	"net"
 	"strconv"
-	"sync"
 	"time"
 
-	"mtg/antireplay"
-	"mtg/config"
-	"mtg/conntypes"
-	"mtg/obfuscated2"
-	"mtg/protocol"
-	"mtg/stats"
-	"mtg/tlstypes"
-	"mtg/wrappers/stream"
+	"github.com/9seconds/mtg/antireplay"
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/obfuscated2"
+	"github.com/9seconds/mtg/protocol"
+	"github.com/9seconds/mtg/stats"
+	"github.com/9seconds/mtg/tlstypes"
+	"github.com/9seconds/mtg/wrappers/stream"
 )
 
 type ClientProtocol struct {
@@ -101,6 +100,8 @@ func (c *ClientProtocol) tlsHandshake(conn io.ReadWriter) error {
 }
 
 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)
 
@@ -108,25 +109,7 @@ func (c *ClientProtocol) cloakHost(clientConn io.ReadWriteCloser) {
 		return
 	}
 
-	defer hostConn.Close()
-
-	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
+	cloak(clientConn, hostConn)
 }
 
 func MakeClientProtocol() protocol.ClientProtocol {

faketls/cloak.go

@@ -0,0 +1,71 @@
+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 func() {
+		defer wg.Done()
+		io.Copy(one, another) // nolint: errcheck
+	}()
+
+	go func() {
+		defer wg.Done()
+		io.Copy(another, one) // nolint: errcheck
+	}()
+
+	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()
+}

go.mod

@@ -1,20 +1,21 @@
-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/cespare/xxhash/v2 v2.1.1 // indirect
-	github.com/prometheus/client_golang v1.2.1
-	github.com/prometheus/procfs v0.0.7 // indirect
+	github.com/beevik/ntp v0.3.0
+	github.com/golang/protobuf v1.3.5 // indirect
+	github.com/prometheus/client_golang v1.5.1
+	github.com/prometheus/procfs v0.0.11 // indirect
 	github.com/smira/go-statsd v1.3.1
-	go.uber.org/multierr v1.4.0 // indirect
-	go.uber.org/zap v1.13.0
-	golang.org/x/crypto v0.0.0-20191117063200-497ca9f6d64f
-	golang.org/x/net v0.0.0-20191116160921-f9c825593386 // indirect
-	golang.org/x/sys v0.0.0-20191118013547-6254a7c3cac6
-	golang.org/x/tools v0.0.0-20191118051429-5a76f03bc7c3 // indirect
+	go.uber.org/zap v1.14.1
+	golang.org/x/crypto v0.0.0-20200317142112-1b76d66859c6
+	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
+	golang.org/x/net v0.0.0-20200319234117-63522dbf7eec // indirect
+	golang.org/x/sys v0.0.0-20200317113312-5766fd39f98d
+	golang.org/x/tools v0.0.0-20200319210407-521f4a0cd458 // indirect
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
+	honnef.co/go/tools v0.0.1-2020.1.3 // indirect
 )

go.sum

@@ -1,9 +1,7 @@
 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/OneOfOne/xxhash v1.2.5/go.mod h1:eZbhyaAYD41SGSSsnmcpxVoRiQ/MPUTjUdIIOT9Um7Q=
-github.com/VictoriaMetrics/fastcache v1.5.2 h1:Erd8iIuBAL9kke8JzM4+WxkKuFkHh3ktwLanJvDgR44=
-github.com/VictoriaMetrics/fastcache v1.5.2/go.mod h1:+jv9Ckb+za/P1ZRg/sulP5Ni1v49daAVERr0H3CuscE=
+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/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
@@ -16,19 +14,14 @@ github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2c
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156 h1:eMwmnE/GDgah4HI848JfFxHt+iPb26b4zyfspmqY0/8=
 github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156/go.mod h1:Cb/ax3seSYIx7SuZdm2G2xzfwmv3TPSk2ucNfQESPXM=
-github.com/beevik/ntp v0.2.0 h1:sGsd+kAXzT0bfVfzJfce04g+dSRfrs+tbQW8lweuYgw=
-github.com/beevik/ntp v0.2.0/go.mod h1:hIHWr+l3+/clUnF44zdK+CWW7fO8dR5cIylAQ76NRpg=
+github.com/beevik/ntp v0.3.0 h1:xzVrPrE4ziasFXgBVBZJDP0Wg/KpMwk2KHJ4Ba8GrDw=
+github.com/beevik/ntp v0.3.0/go.mod h1:hIHWr+l3+/clUnF44zdK+CWW7fO8dR5cIylAQ76NRpg=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
-github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
-github.com/cespare/xxhash/v2 v2.0.1-0.20190104013014-3767db7a7e18/go.mod h1:HD5P3vAIAh+Y2GAxg0PrPN1P8WkepXGpjbUPDHJqqKM=
-github.com/cespare/xxhash/v2 v2.1.0 h1:yTUvW7Vhb89inJ+8irsUqiWjh8iT6sQPZiQzI6ReGkA=
-github.com/cespare/xxhash/v2 v2.1.0/go.mod h1:dgIUBU3pDso/gPgZ1osOZ0iQf77oPR28Tjxl5dIMyVM=
 github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -47,16 +40,18 @@ github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.5 h1:F768QJ1E9tib+q5Sc8MkdJi1RxLTbRcTf8LJV56aRls=
+github.com/golang/protobuf v1.3.5/go.mod h1:6O5/vntMXwX2lRkT1hjjk0nAC1IDOTvTlVgjlRvqsdk=
 github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
-github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
+github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
-github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
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@@ -81,33 +76,31 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
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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=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3 h1:sXmLre5bzIR6ypkjXCDI3jHPssRhc8KD/Ome589sc3U=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=

hub/connection.go

@@ -4,15 +4,18 @@ import (
 	"fmt"
 	"math/rand"
 	"sync"
+	"time"
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
-	"mtg/mtproto"
-	"mtg/mtproto/rpc"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/mtproto"
+	"github.com/9seconds/mtg/mtproto/rpc"
+	"github.com/9seconds/mtg/protocol"
 )
 
+const connectionTTL = time.Hour
+
 type connection struct {
 	conn            conntypes.PacketReadWriteCloser
 	proxyConns      map[string]*ProxyConn
@@ -31,6 +34,9 @@ type connection struct {
 func (c *connection) run() {
 	defer c.Close()
 
+	ttl := time.NewTimer(connectionTTL)
+	defer ttl.Stop()
+
 	for {
 		select {
 		case <-c.channelDone:
@@ -39,6 +45,9 @@ 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 {

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) {
-	if len(c.connections) > 0 {
-		c.gc()
-	}
-
+func (c *connectionList) get(conn *ProxyConn) (*connection, error) {
 	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
@@ -41,6 +37,9 @@ 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"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/conntypes"
+	"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"
-	"mtg/mtproto/rpc"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/mtproto/rpc"
+	"github.com/9seconds/mtg/protocol"
 )
 
 const (

main.go

@@ -3,16 +3,18 @@ package main
 import (
 	"math/rand"
 	"os"
+	"runtime/debug"
+	"strings"
 	"time"
 
 	kingpin "gopkg.in/alecthomas/kingpin.v2"
 
-	"mtg/cli"
-	"mtg/config"
-	"mtg/utils"
+	"github.com/9seconds/mtg/cli"
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/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 +43,11 @@ 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').
@@ -108,13 +115,18 @@ 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 +140,7 @@ 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 +154,7 @@ 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 +167,25 @@ 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"
-	"mtg/mtproto/rpc"
-	"mtg/protocol"
-	"mtg/telegram"
-	"mtg/wrappers/packet"
-	"mtg/wrappers/stream"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/mtproto/rpc"
+	"github.com/9seconds/mtg/protocol"
+	"github.com/9seconds/mtg/telegram"
+	"github.com/9seconds/mtg/wrappers/packet"
+	"github.com/9seconds/mtg/wrappers/stream"
 )
 
 func TelegramProtocol(req *protocol.TelegramRequest) (conntypes.PacketReadWriteCloser, error) {

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

@@ -7,20 +7,15 @@ import (
 
 	"github.com/beevik/ntp"
 	"go.uber.org/zap"
+
+	"github.com/9seconds/mtg/config"
 )
 
 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))]
 
 	resp, err := ntp.Query(url)
 	if err != nil {

obfuscated2/client_protocol.go

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

obfuscated2/telegram_protocol.go

@@ -4,11 +4,11 @@ import (
 	"crypto/rand"
 	"fmt"
 
-	"mtg/conntypes"
-	"mtg/protocol"
-	"mtg/telegram"
-	"mtg/utils"
-	"mtg/wrappers/stream"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/protocol"
+	"github.com/9seconds/mtg/telegram"
+	"github.com/9seconds/mtg/utils"
+	"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

@@ -5,7 +5,7 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type TelegramRequest struct {

proxy/direct.go

@@ -6,9 +6,9 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
-	"mtg/obfuscated2"
-	"mtg/protocol"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/obfuscated2"
+	"github.com/9seconds/mtg/protocol"
 )
 
 const directPipeBufferSize = 1024 * 1024

proxy/middle.go

@@ -5,9 +5,9 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
-	"mtg/protocol"
-	"mtg/wrappers/packetack"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/protocol"
+	"github.com/9seconds/mtg/wrappers/packetack"
 )
 
 func middleConnection(request *protocol.TelegramRequest) {

proxy/proxy.go

@@ -6,12 +6,12 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/config"
-	"mtg/conntypes"
-	"mtg/protocol"
-	"mtg/stats"
-	"mtg/utils"
-	"mtg/wrappers/stream"
+	"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"
 )
 
 type Proxy struct {
@@ -30,8 +30,7 @@ func (p *Proxy) Serve(listener net.Listener) {
 			case <-doneChan:
 				return
 			default:
-				p.Logger.Errorw("Cannot allocate incoming connection", "error", err)
-				continue
+				p.Logger.Fatalw("Cannot allocate incoming connection", "error", err)
 			}
 		}
 
@@ -42,6 +41,7 @@ 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)
@@ -69,7 +69,9 @@ func (p *Proxy) accept(conn net.Conn) {
 	clientConn, err := clientProtocol.Handshake(clientConn)
 
 	if err != nil {
+		stats.Stats.AuthenticationFailed()
 		logger.Warnw("Cannot perform client handshake", "error", err)
+
 		return
 	}
 

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_PORT=${MTG_PORT}" >> "$MTG_ENV"
-    echo "MTG_CONTAINER=${MTG_CONTAINER}" >> "$MTG_ENV"
+    echo "MTG_IMAGENAME=$MTG_IMAGENAME" > "$MTG_ENV"
+    echo "MTG_PORT=$MTG_PORT" >> "$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=$MTG_CONTAINER" -aq | xargs -r docker rm -fv
-docker run \
+$DOCKER_CMD ps --filter "Name=$MTG_CONTAINER" -aq | xargs -r $DOCKER_CMD rm -fv > /dev/null
+$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

@@ -8,16 +8,18 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 
-	"mtg/config"
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type statsPrometheus struct {
-	connections         *prometheus.GaugeVec
-	telegramConnections *prometheus.GaugeVec
-	traffic             *prometheus.GaugeVec
-	crashes             prometheus.Counter
-	replayAttacks       prometheus.Counter
+	connections          *prometheus.GaugeVec
+	telegramConnections  *prometheus.GaugeVec
+	traffic              *prometheus.GaugeVec
+	crashes              prometheus.Counter
+	replayAttacks        prometheus.Counter
+	authenticationFailed prometheus.Counter
+	cloakedRequests      prometheus.Counter
 }
 
 func (s *statsPrometheus) IngressTraffic(traffic int) {
@@ -87,6 +89,14 @@ 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 +126,16 @@ 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 +143,8 @@ 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

@@ -11,8 +11,8 @@ import (
 	statsd "github.com/smira/go-statsd"
 	"go.uber.org/zap"
 
-	"mtg/config"
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 var (
@@ -137,6 +137,14 @@ 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

@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	apiUserAgent   = "mtg"
+	apiUserAgent   = "github.com/9seconds/mtg"
 	apiHTTPTimeout = 30 * time.Second
 )
 

telegram/base.go

@@ -1,21 +1,25 @@
 package telegram
 
 import (
-	"fmt"
+	"errors"
 	"math/rand"
 	"net"
 
-	"mtg/conntypes"
-	"mtg/utils"
-	"mtg/wrappers/stream"
+	"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"
 )
 
 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 +30,46 @@ 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)
+			continue
+		}
 
-	switch protocol {
-	case conntypes.ConnectionProtocolIPv4:
-		addr = b.chooseAddress(b.v4Addresses, dc, b.v4DefaultDC)
-	default:
-		addr = b.chooseAddress(b.v6Addresses, dc, b.V6DefaultDC)
+		if err := utils.InitTCP(conn); err != nil {
+			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)
-	if err != nil {
-		return nil, fmt.Errorf("dial has failed: %w", err)
+	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 err := utils.InitTCP(conn); err != nil {
-		return nil, fmt.Errorf("cannot initialize tcp socket: %w", err)
+	if config.C.PreferIP == config.PreferIPv4 {
+		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,

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

@@ -7,8 +7,8 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
-	"mtg/telegram/api"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/telegram/api"
 )
 
 const middleTelegramBackgroundUpdateEvery = time.Hour
@@ -45,7 +45,7 @@ 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"
-	"mtg/utils"
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/utils"
 )
 
 type ClientHello struct {

tlstypes/handshake.go

@@ -3,7 +3,7 @@ package tlstypes
 import (
 	"bytes"
 
-	"mtg/utils"
+	"github.com/9seconds/mtg/utils"
 )
 
 type Handshake struct {

tlstypes/server_hello.go

@@ -10,7 +10,7 @@ import (
 
 	"golang.org/x/crypto/curve25519"
 
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
 )
 
 type ServerHello struct {

utils/init_tcp.go

@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"net"
 
-	"mtg/config"
+	"github.com/9seconds/mtg/config"
 )
 
 func InitTCP(conn net.Conn) error {

wrappers/packet/mtproto_frame.go

@@ -12,7 +12,7 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 const (

wrappers/packetack/client_abridged.go

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

wrappers/packetack/client_intermediate.go

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

wrappers/packetack/client_intermediate_secure.go

@@ -8,7 +8,7 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type wrapperClientIntermediateSecure struct {

wrappers/packetack/proxy.go

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

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

@@ -9,8 +9,8 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
-	"mtg/utils"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/utils"
 )
 
 type wrapperBlockCipher struct {

wrappers/stream/conn.go

@@ -7,8 +7,8 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/config"
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type connPurpose uint8

wrappers/stream/ctx.go

@@ -8,7 +8,7 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type wrapperCtx struct {

wrappers/stream/faketls.go

@@ -8,8 +8,8 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
-	"mtg/tlstypes"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/tlstypes"
 )
 
 type wrapperFakeTLS struct {

wrappers/stream/mtproto_cipher.go

@@ -9,9 +9,9 @@ import (
 	"encoding/binary"
 	"net"
 
-	"mtg/conntypes"
-	"mtg/mtproto/rpc"
-	"mtg/utils"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/mtproto/rpc"
+	"github.com/9seconds/mtg/utils"
 )
 
 type mtprotoCipherPurpose uint8

wrappers/stream/obfuscated2.go

@@ -8,7 +8,7 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type wrapperObfuscated2 struct {

wrappers/stream/rewind.go

@@ -9,7 +9,7 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 type ReadWriteCloseRewinder interface {

wrappers/stream/stats_telegram.go

@@ -7,8 +7,8 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
-	"mtg/stats"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/stats"
 )
 
 type wrapperTelegramStats struct {

wrappers/stream/stats_traffic.go

@@ -6,8 +6,8 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
-	"mtg/stats"
+	"github.com/9seconds/mtg/conntypes"
+	"github.com/9seconds/mtg/stats"
 )
 
 type wrapperTrafficStats struct {

wrappers/stream/timeout.go

@@ -6,7 +6,7 @@ import (
 
 	"go.uber.org/zap"
 
-	"mtg/conntypes"
+	"github.com/9seconds/mtg/conntypes"
 )
 
 const (