Merge branch 'stable' into v2

.mise.toml

 [tools]
-go = "latest"
+"go:golang.org/x/pkgsite/cmd/pkgsite" = "latest"
 "go:golang.org/x/tools/gopls" = "latest"
 "go:mvdan.cc/gofumpt" = "latest"
+go = "latest"
+golangci-lint = "latest"
+goreleaser = "latest"
 
 [vars]
 fuzzflags = "-fuzztime=120s"
 
 [tasks.lint]
 description = "Run linter"
-tools.golangci-lint = "latest"
 run = "golangci-lint run"
 
 [tasks.test]
 
 [tasks.release]
 description = "Create release tarballs"
-tools.goreleaser = "latest"
 sources = ["**/*.go", "go.mod", "go.sum", ".goreleaser.yml"]
 run = [
     "goreleaser --snapshot --clean",
 
 [tasks.docs]
 description = "Run doc server"
-tools."go:golang.org/x/pkgsite/cmd/pkgsite" = "latest"
 run = "pkgsite -http 0.0.0.0:10000"
 
 [tasks.fmt]

README.md

 **If you use v1.0 or upgrade broke you proxy, please read the chapter
 [Version 2](#version-2)**
 
+If you want to have a proxy that _supports adtag_ (possibility to promote a
+channel with a special Telegram bot), I recommend to use
+[telemt](https://github.com/telemt/telemt) project. v1 of mtg supports it
+but I do not see any reasonable point of using it: adtag requires communication
+via a fragile set of middle proxies, requires complex setup that must expose
+a public IPs, has lower bandwidth and latency.
+
+mtg idea is simple: minimal unbloated proxy that can handle a reasonable scale
+~10-20k simultaneous connections, has no user management, but ticks all
+checkboxes related to its main intent: provide a way to use Telegram.
+
 ## Rationale
 
 There are several available proxies for Telegram MTPROTO available. Here
 * [Official](https://github.com/TelegramMessenger/MTProxy)
 * [Python](https://github.com/alexbers/mtprotoproxy)
 * [Erlang](https://github.com/seriyps/mtproto_proxy)
+* [Telemt (Rust)](https://github.com/telemt/telemt)
 
 You can use any of these. They work great and all implementations have
 feature parity now. This includes support of adtag, replay attack
   way of doing business I suppose. I think the only viable way is to
   have a proxy that can be restored anywhere easily.
 
+* **Supports proxy protocol v1/v2**
+
+  This makes integration with loadbalancers like HAProxy and ELB a first class
+  citizen by supporting their
+  [commuication protocols](https://www.haproxy.org/download/2.3/doc/proxy-protocol.txt).
+
 * **A single secret**
 
   I think that multiple secrets solve no problems and just complex
 
 ## Getting started
 
+### Download mise
+
+mtg uses [mise](https://mise.jdx.dev/) to maintain its development
+dependencies + replaces a make for building things. Please
+[install](https://mise.jdx.dev/getting-started.html) it first.
+
 ### Download a tool
 
 #### Download binaries
 ```console
 git clone https://github.com/9seconds/mtg.git
 cd mtg
-make static
+mise install
+mise tasks run build
 ```
 
 or for the docker image:
 
 ```console
-make docker
+mise tasks run image
 ```
 
 ### Generate secret

events/event_stream.go

 
 import (
 	"context"
-	"math/rand"
+	"math/rand/v2"
 	"runtime"
 
 	"github.com/9seconds/mtg/v2/mtglib"
 		chans:     make([]chan mtglib.Event, runtime.NumCPU()),
 	}
 
-	for i := 0; i < runtime.NumCPU(); i++ {
+	for i := range runtime.NumCPU() {
 		rv.chans[i] = make(chan mtglib.Event, 1)
 
 		if len(observerFactories) == 1 {

events/multi_observer.go

 
 func (m multiObserver) EventStart(evt mtglib.EventStart) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventStart(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventStart(evt)
+		})
 	}
 
 	wg.Wait()
 
 func (m multiObserver) EventConnectedToDC(evt mtglib.EventConnectedToDC) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventConnectedToDC(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventConnectedToDC(evt)
+		})
 	}
 
 	wg.Wait()
 
 func (m multiObserver) EventDomainFronting(evt mtglib.EventDomainFronting) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventDomainFronting(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventDomainFronting(evt)
+		})
 	}
 
 	wg.Wait()
 
 func (m multiObserver) EventTraffic(evt mtglib.EventTraffic) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventTraffic(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventTraffic(evt)
+		})
 	}
 
 	wg.Wait()
 
 func (m multiObserver) EventFinish(evt mtglib.EventFinish) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventFinish(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventFinish(evt)
+		})
 	}
 
 	wg.Wait()
 
 func (m multiObserver) EventConcurrencyLimited(evt mtglib.EventConcurrencyLimited) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventConcurrencyLimited(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventConcurrencyLimited(evt)
+		})
 	}
 
 	wg.Wait()
 
 func (m multiObserver) EventIPBlocklisted(evt mtglib.EventIPBlocklisted) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventIPBlocklisted(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventIPBlocklisted(evt)
+		})
 	}
 
 	wg.Wait()
 
 func (m multiObserver) EventReplayAttack(evt mtglib.EventReplayAttack) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventReplayAttack(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventReplayAttack(evt)
+		})
 	}
 
 	wg.Wait()
 
 func (m multiObserver) EventIPListSize(evt mtglib.EventIPListSize) {
 	wg := &sync.WaitGroup{}
-	wg.Add(len(m.observers))
 
 	for _, v := range m.observers {
-		go func(obs Observer) {
-			defer wg.Done()
-
-			obs.EventIPListSize(evt)
-		}(v)
+		wg.Go(func() {
+			v.EventIPListSize(evt)
+		})
 	}
 
 	wg.Wait()

example.config.toml

 # Host:port pair to run proxy on.
 bind-to = "0.0.0.0:3128"
 
+# This defines what types of traffic mtg listens to. If you are not sure,
+# then definitely keep it disable. Enable it only and only if incoming traffic
+# is coming from some sort of load-balancer like HAProxy or ELB.
+# https://www.haproxy.org/download/2.3/doc/proxy-protocol.txt
+#
+# mtg uses a library that supports v1 and v2 versions of ProxyProtocol.
+# default value is false.
+# proxy-protocol-listener = false
+
 # Defines how many concurrent connections are allowed to this proxy.
 # All other incoming connections are going to be dropped.
 concurrency = 8192

go.mod

 
 require (
 	github.com/pelletier/go-toml/v2 v2.2.4
+	github.com/pires/go-proxyproto v0.11.0
 	github.com/txthinking/socks5 v0.0.0-20251011041537-5c31f201a10e
 	github.com/yl2chen/cidranger v1.0.2
 )

go.sum

 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
 github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
 github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
+github.com/pires/go-proxyproto v0.11.0 h1:gUQpS85X/VJMdUsYyEgyn59uLJvGqPhJV5YvG68wXH4=
+github.com/pires/go-proxyproto v0.11.0/go.mod h1:ZKAAyp3cgy5Y5Mo4n9AlScrkCZwUy0g3Jf+slqQVcuU=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=

internal/cli/access.go

 	}
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2)
-
-	go func() {
-		defer wg.Done()
 
+	wg.Go(func() {
 		ip := a.PublicIPv4
 		if ip == nil {
 			ip = a.getIP(ntw, "tcp4")
 		}
 
 		resp.IPv4 = a.makeURLs(conf, ip)
-	}()
-
-	go func() {
-		defer wg.Done()
-
+	})
+	wg.Go(func() {
 		ip := a.PublicIPv6
 		if ip == nil {
 			ip = a.getIP(ntw, "tcp6")
 		}
 
 		resp.IPv6 = a.makeURLs(conf, ip)
-	}()
+	})
 
 	wg.Wait()
 

internal/cli/run_proxy.go

 	"github.com/9seconds/mtg/v2/antireplay"
 	"github.com/9seconds/mtg/v2/events"
 	"github.com/9seconds/mtg/v2/internal/config"
+	"github.com/9seconds/mtg/v2/internal/proxyprotocol"
 	"github.com/9seconds/mtg/v2/internal/utils"
 	"github.com/9seconds/mtg/v2/ipblocklist"
 	"github.com/9seconds/mtg/v2/ipblocklist/files"
 	"github.com/9seconds/mtg/v2/mtglib"
 	"github.com/9seconds/mtg/v2/network"
 	"github.com/9seconds/mtg/v2/stats"
+	"github.com/pires/go-proxyproto"
 	"github.com/rs/zerolog"
 	"github.com/yl2chen/cidranger"
 )
 		return fmt.Errorf("cannot start proxy: %w", err)
 	}
 
+	if conf.ProxyProtocolListener.Get(false) {
+		listener = &proxyprotocol.ListenerAdapter{
+			Listener: proxyproto.Listener{
+				Listener: listener,
+			},
+		}
+	}
+
 	ctx := utils.RootContext()
 
 	go proxy.Serve(listener) //nolint: errcheck

internal/config/config.go

 	AllowFallbackOnUnknownDC TypeBool        `json:"allowFallbackOnUnknownDc"`
 	Secret                   mtglib.Secret   `json:"secret"`
 	BindTo                   TypeHostPort    `json:"bindTo"`
+	ProxyProtocolListener    TypeBool        `json:"proxyProtocolListener"`
 	PreferIP                 TypePreferIP    `json:"preferIp"`
 	DomainFrontingPort       TypePort        `json:"domainFrontingPort"`
 	TolerateTimeSkewness     TypeDuration    `json:"tolerateTimeSkewness"`

internal/config/parse.go

 	AllowFallbackOnUnknownDC bool   `toml:"allow-fallback-on-unknown-dc" json:"allowFallbackOnUnknownDc,omitempty"`
 	Secret                   string `toml:"secret" json:"secret"`
 	BindTo                   string `toml:"bind-to" json:"bindTo"`
+	ProxyProtocolListener    bool   `toml:"proxy-protocol-listener" json:"proxyProtocolListener"`
 	PreferIP                 string `toml:"prefer-ip" json:"preferIp,omitempty"`
 	DomainFrontingPort       uint   `toml:"domain-fronting-port" json:"domainFrontingPort,omitempty"`
 	TolerateTimeSkewness     string `toml:"tolerate-time-skewness" json:"tolerateTimeSkewness,omitempty"`

internal/config/type_bool_test.go

 }
 
 func (suite *TypeBoolTestSuite) TestUnmarshalFail() {
-	testData := []interface{}{
+	testData := []any{
 		"",
 		"np",
 		"нет",
 	}
 
 	for _, v := range testData {
-		data, err := json.Marshal(map[string]interface{}{
+		data, err := json.Marshal(map[string]any{
 			"value": v,
 		})
 		suite.NoError(err)

internal/proxyprotocol/adapter.go

+package proxyprotocol
+
+import (
+	"net"
+
+	"github.com/pires/go-proxyproto"
+)
+
+type ListenerAdapter struct {
+	proxyproto.Listener
+}
+
+func (l *ListenerAdapter) Accept() (net.Conn, error) {
+	conn, err := l.Listener.Accept()
+	if err != nil {
+		return nil, err
+	}
+
+	return connWrapper{conn.(*proxyproto.Conn)}, nil
+}

internal/proxyprotocol/conn.go

+package proxyprotocol
+
+import "github.com/pires/go-proxyproto"
+
+type connWrapper struct {
+	*proxyproto.Conn
+}
+
+func (c connWrapper) CloseRead() error {
+	tcpConn, ok := c.TCPConn()
+	if !ok {
+		panic("we support only tcp connections")
+	}
+
+	return tcpConn.CloseRead()
+}
+
+func (c connWrapper) CloseWrite() error {
+	tcpConn, ok := c.TCPConn()
+	if !ok {
+		panic("we support only tcp connections")
+	}
+
+	return tcpConn.CloseWrite()
+}

ipblocklist/firehol.go

 	defer cancel()
 
 	wg := &sync.WaitGroup{}
-	wg.Add(len(f.blocklists))
 
 	mutex := &sync.Mutex{}
 	ranger := cidranger.NewPCTrieRanger()
 
 	for _, v := range f.blocklists {
-		go func(file files.File) {
-			defer wg.Done()
+		wg.Go(func() {
+			logger := f.logger.BindStr("filename", v.String())
 
-			logger := f.logger.BindStr("filename", file.String())
-
-			fileContent, err := file.Open(ctx)
+			fileContent, err := v.Open(ctx)
 			if err != nil {
 				logger.WarningError("update has failed", err)
 
 			if err := f.updateFromFile(mutex, ranger, bufio.NewScanner(fileContent)); err != nil {
 				logger.WarningError("update has failed", err)
 			}
-		}(v)
+		})
 	}
 
 	wg.Wait()

logger/init.go

 // commonly used by many 3pp tools. While mtglib itself does not need it, it is
 // always a good idea to support it and have a transient end to end logging.
 type StdLikeLogger interface {
-	Printf(format string, args ...interface{})
+	Printf(format string, args ...any)
 }

logger/noop.go

 func (n noopLogger) BindInt(_ string, _ int) mtglib.Logger { return n }
 func (n noopLogger) BindStr(_, _ string) mtglib.Logger     { return n }
 func (n noopLogger) BindJSON(_, _ string) mtglib.Logger    { return n }
-func (n noopLogger) Printf(_ string, _ ...interface{})     {}
+func (n noopLogger) Printf(_ string, _ ...any)             {}
 func (n noopLogger) Info(_ string)                         {}
 func (n noopLogger) Warning(_ string)                      {}
 func (n noopLogger) Debug(_ string)                        {}

logger/zerolog.go

 	}
 }
 
-func (z *zeroLogContext) Printf(format string, args ...interface{}) {
+func (z *zeroLogContext) Printf(format string, args ...any) {
 	z.Debug(fmt.Sprintf(format, args...))
 }
 

mise.lock

 "platforms.macos-x64" = { checksum = "sha256:1ca28b7703cbea05a65b2a1d92d6b308610ef92f8824578a0874f2e60c9d5a22", url = "https://dl.google.com/go/go1.26.0.darwin-amd64.tar.gz"}
 "platforms.windows-x64" = { checksum = "sha256:9bbe0fc64236b2b51f6255c05c4232532b8ecc0e6d2e00950bd3021d8a4d07d4", url = "https://dl.google.com/go/go1.26.0.windows-amd64.zip"}
 
+[[tools."go:golang.org/x/pkgsite/cmd/pkgsite"]]
+version = "latest"
+backend = "go:golang.org/x/pkgsite/cmd/pkgsite"
+
 [[tools."go:golang.org/x/tools/gopls"]]
-version = "0.21.0"
+version = "0.21.1"
 backend = "go:golang.org/x/tools/gopls"
 
 [[tools."go:mvdan.cc/gofumpt"]]
 version = "0.9.2"
 backend = "go:mvdan.cc/gofumpt"
+
+[[tools.golangci-lint]]
+version = "2.10.1"
+backend = "aqua:golangci/golangci-lint"
+"platforms.linux-arm64" = { checksum = "sha256:6652b42ae02915eb2f9cb2a2e0cac99514c8eded8388d88ae3e06e1a52c00de8", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-linux-arm64.tar.gz"}
+"platforms.linux-x64" = { checksum = "sha256:dfa775874cf0561b404a02a8f4481fc69b28091da95aa697259820d429b09c99", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-linux-amd64.tar.gz"}
+"platforms.macos-arm64" = { checksum = "sha256:03bfadf67e52b441b7ec21305e501c717df93c959836d66c7f97312654acb297", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-darwin-arm64.tar.gz"}
+"platforms.macos-x64" = { checksum = "sha256:66fb0da81b8033b477f97eea420d4b46b230ca172b8bb87c6610109f3772b6b6", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-darwin-amd64.tar.gz"}
+"platforms.windows-x64" = { checksum = "sha256:c60c87695e79db8e320f0e5be885059859de52bb5ee5f11be5577828570bc2a3", url = "https://github.com/golangci/golangci-lint/releases/download/v2.10.1/golangci-lint-2.10.1-windows-amd64.zip"}
+
+[[tools.goreleaser]]
+version = "2.13.3"
+backend = "aqua:goreleaser/goreleaser"
+"platforms.linux-arm64" = { checksum = "sha256:156656d0f874542d618568bd50afd3d33ced2e8aab2c60cc7c21e1b9fa52031e", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Linux_arm64.tar.gz"}
+"platforms.linux-x64" = { checksum = "sha256:4b66f2f78f78561330350651ade557b70328664718490f37834749073af21d20", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Linux_x86_64.tar.gz"}
+"platforms.macos-arm64" = { checksum = "sha256:5516c37779efb3935d5b213cda3b0b9025ae94ddbcb51df6919acbcdef4194b0", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Darwin_all.tar.gz"}
+"platforms.macos-x64" = { checksum = "sha256:5516c37779efb3935d5b213cda3b0b9025ae94ddbcb51df6919acbcdef4194b0", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Darwin_all.tar.gz"}
+"platforms.windows-x64" = { checksum = "sha256:c5586c4ed749ca358ad61ed73ee4b8039cfa68daae8c23e69fb086d549dfb31d", url = "https://github.com/goreleaser/goreleaser/releases/download/v2.13.3/goreleaser_Windows_x86_64.zip"}

mtglib/init.go

 	BindJSON(name, value string) Logger
 
 	// Printf is to support log.Logger behavior.
-	Printf(format string, args ...interface{})
+	Printf(format string, args ...any)
 
 	// Info puts a message about some normal situation.
 	Info(msg string)

mtglib/init_internal_test.go

 
 type NoopLogger struct{}
 
-func (n NoopLogger) Named(_ string) Logger             { return n }
-func (n NoopLogger) BindInt(_ string, _ int) Logger    { return n }
-func (n NoopLogger) BindStr(_, _ string) Logger        { return n }
-func (n NoopLogger) BindJSON(_, _ string) Logger       { return n }
-func (n NoopLogger) Printf(_ string, _ ...interface{}) {}
-func (n NoopLogger) Info(_ string)                     {}
-func (n NoopLogger) Warning(_ string)                  {}
-func (n NoopLogger) Debug(_ string)                    {}
-func (n NoopLogger) InfoError(_ string, _ error)       {}
-func (n NoopLogger) WarningError(_ string, _ error)    {}
-func (n NoopLogger) DebugError(_ string, _ error)      {}
+func (n NoopLogger) Named(_ string) Logger          { return n }
+func (n NoopLogger) BindInt(_ string, _ int) Logger { return n }
+func (n NoopLogger) BindStr(_, _ string) Logger     { return n }
+func (n NoopLogger) BindJSON(_, _ string) Logger    { return n }
+func (n NoopLogger) Printf(_ string, _ ...any)      {}
+func (n NoopLogger) Info(_ string)                  {}
+func (n NoopLogger) Warning(_ string)               {}
+func (n NoopLogger) Debug(_ string)                 {}
+func (n NoopLogger) InfoError(_ string, _ error)    {}
+func (n NoopLogger) WarningError(_ string, _ error) {}
+func (n NoopLogger) DebugError(_ string, _ error)   {}
 
 type EventStreamMock struct {
 	mock.Mock

mtglib/internal/faketls/client_hello.go

 
 	computedRandom := mac.Sum(nil)
 
-	for i := 0; i < RandomLen; i++ {
+	for i := range RandomLen {
 		computedRandom[i] ^= hello.Random[i]
 	}
 

mtglib/internal/faketls/conn.go

 import (
 	"bytes"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 
 	"github.com/9seconds/mtg/v2/essentials"
 	"github.com/9seconds/mtg/v2/mtglib/internal/faketls/record"
 	lenP := len(p)
 
 	for len(p) > 0 {
-		chunkSize := rand.Intn(record.TLSMaxRecordSize)
+		chunkSize := rand.IntN(record.TLSMaxRecordSize)
 		if chunkSize > len(p) || chunkSize == 0 {
 			chunkSize = len(p)
 		}

mtglib/internal/faketls/conn_test.go

 
 import (
 	"bytes"
+	"crypto/rand"
 	"errors"
 	"io"
-	"math/rand"
 	"testing"
 
 	"github.com/9seconds/mtg/v2/internal/testlib"
 	suite.connMock.On("Write", mock.Anything).Return(0, nil)
 
 	dataToRec := make([]byte, record.TLSMaxRecordSize*2)
-	rand.Read(dataToRec) //nolint: staticcheck
+	rand.Read(dataToRec) //nolint: staticcheck, errcheck
 
 	n, err := suite.c.Write(dataToRec)
 	suite.NoError(err)

mtglib/internal/faketls/pools.go

 )
 
 var bytesBufferPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		return &bytes.Buffer{}
 	},
 }

mtglib/internal/faketls/record/pools.go

 )
 
 var recordPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		return &Record{}
 	},
 }

mtglib/internal/faketls/welcome.go

 	"crypto/sha256"
 	"encoding/binary"
 	"io"
-	mrand "math/rand"
+	mrand "math/rand/v2"
 
 	"github.com/9seconds/mtg/v2/mtglib/internal/faketls/record"
 	"golang.org/x/crypto/curve25519"
 	rec.Type = record.TypeApplicationData
 	rec.Version = record.Version12
 
-	if _, err := io.CopyN(&rec.Payload, rand.Reader, int64(1024+mrand.Intn(3092))); err != nil {
+	if _, err := io.CopyN(&rec.Payload, rand.Reader, int64(1024+mrand.IntN(3092))); err != nil {
 		panic(err)
 	}
 

mtglib/internal/faketls/welcome_test.go

 import (
 	"bytes"
 	"crypto/hmac"
+	"crypto/rand"
 	"crypto/sha256"
-	"math/rand"
 	"testing"
 	"time"
 

mtglib/internal/obfuscated2/handshake_frame.go

 func (h *handshakeFrame) invert() handshakeFrame {
 	copyFrame := *h
 
-	for i := 0; i < handshakeFrameLenKey+handshakeFrameLenIV; i++ {
+	for i := range handshakeFrameLenKey + handshakeFrameLenIV {
 		copyFrame.data[handshakeFrameOffsetKey+i] = h.data[handshakeFrameOffsetConnectionType-1-i]
 	}
 

mtglib/internal/obfuscated2/init_test.go

 
 	serverEncryptedReverted := make([]byte, len(serverEncrypted))
 
-	for i := 0; i < 32+16; i++ {
+	for i := range 32 + 16 {
 		serverEncryptedReverted[8+i] = serverEncrypted[8+32+16-1-i]
 	}
 

mtglib/internal/obfuscated2/pools.go

 
 var (
 	sha256HasherPool = sync.Pool{
-		New: func() interface{} {
+		New: func() any {
 			return sha256.New()
 		},
 	}
 	bytesBufferPool = sync.Pool{
-		New: func() interface{} {
+		New: func() any {
 			return &bytes.Buffer{}
 		},
 	}

mtglib/internal/relay/init.go

 )
 
 type Logger interface {
-	Printf(msg string, args ...interface{})
+	Printf(msg string, args ...any)
 }

mtglib/internal/relay/init_test.go

 
 type loggerMock struct{}
 
-func (l loggerMock) Printf(format string, args ...interface{}) {}
+func (l loggerMock) Printf(format string, args ...any) {}

mtglib/internal/relay/pools.go

 import "sync"
 
 var copyBufferPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		rv := make([]byte, copyBufferSize)
 
 		return &rv

mtglib/proxy.go

 	}
 
 	pool, err := ants.NewPoolWithFunc(opts.getConcurrency(),
-		func(arg interface{}) {
+		func(arg any) {
 			proxy.ServeConn(arg.(essentials.Conn)) //nolint: forcetypeassert
 		},
 		ants.WithLogger(opts.getLogger("ants")),

mtglib/stream_context.go

 	return s.ctx.Err() //nolint: wrapcheck
 }
 
-func (s *streamContext) Value(key interface{}) interface{} {
+func (s *streamContext) Value(key any) any {
 	return s.ctx.Value(key)
 }
 

network/circuit_breaker_internal_test.go

 		Return(suite.connMock, nil)
 
 	wg := &sync.WaitGroup{}
-	wg.Add(5)
-
-	go func() {
-		wg.Wait()
-		suite.ctxCancel()
-	}()
-
-	for i := 0; i < 5; i++ {
-		go func() {
-			defer wg.Done()
 
+	for range 5 {
+		wg.Go(func() {
 			conn, err := suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1")
 
 			suite.mutex.Lock()
 
 			suite.NoError(err)
 			suite.Equal("127.0.0.1:3128", conn.RemoteAddr().String())
-		}()
+		})
 	}
 
+	go func() {
+		wg.Wait()
+		suite.ctxCancel()
+	}()
+
 	suite.Eventually(func() bool {
 		_, ok := <-suite.ctx.Done()
 

network/load_balanced_socks5.go

 import (
 	"context"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"net/url"
 
 	"github.com/9seconds/mtg/v2/essentials"
 
 func (l loadBalancedSocks5Dialer) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
 	length := len(l.dialers)
-	start := rand.Intn(length)
+	start := rand.IntN(length)
 	moved := false
 
 	for i := start; i != start || !moved; i = (i + 1) % length {

network/load_balanced_socks5_test.go

 	})
 	suite.NoError(err)
 
-	for i := 0; i < network.ProxyDialerOpenThreshold*2; i++ {
+	for range network.ProxyDialerOpenThreshold * 2 {
 		_, err = lbDialer.Dial("tcp", "127.1.1.1:80")
 		suite.True(errors.Is(err, network.ErrCannotDialWithAllProxies))
 	}

network/network.go

 import (
 	"context"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 	"net/http"
 	"sync"
 
 	switch protocol {
 	case "tcp", "tcp4":
-		wg.Add(1)
-
-		go func() {
-			defer wg.Done()
-
+		wg.Go(func() {
 			resolved := n.dns.LookupA(address)
 
 			mutex.Lock()
 			ips = append(ips, resolved...)
 			mutex.Unlock()
-		}()
+		})
 	}
 
 	switch protocol {
 	case "tcp", "tcp6":
-		wg.Add(1)
-
-		go func() {
-			defer wg.Done()
-
+		wg.Go(func() {
 			resolved := n.dns.LookupAAAA(address)
 
 			mutex.Lock()
 			ips = append(ips, resolved...)
 			mutex.Unlock()
-		}()
+		})
 	}
 
 	wg.Wait()

stats/pools.go

 import "sync"
 
 var streamInfoPool = sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		return &streamInfo{
 			tags: make(map[string]string),
 		}