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package reality

import (

"bytes"

"encoding/binary"

"io"

"math"

"net"

"strconv"

"sync"

"sync/atomic"

"time"

"github.com/pires/go-proxyproto"

utls "github.com/refraction-networking/utls"

)

var GlobalPostHandshakeRecordsLens sync.Map

var GlobalMaxCSSMsgCount sync.Map

func DetectPostHandshakeRecordsLens(config *Config) {

for sni := range config.ServerNames {

for alpn := range 3 { // 0, 1, 2

key := config.Dest + " " + sni + " " + strconv.Itoa(alpn)

if _, loaded := GlobalPostHandshakeRecordsLens.LoadOrStore(key, false); !loaded {

go func() {

defer func() {

val, _ := GlobalPostHandshakeRecordsLens.Load(key)

if _, ok := val.(bool); ok {

GlobalPostHandshakeRecordsLens.Store(key, []int{})

}

}()

target, err := net.Dial(config.Type, config.Dest)

if err != nil {

return

}

if config.Xver == 1 || config.Xver == 2 {

if _, err = proxyproto.HeaderProxyFromAddrs(config.Xver, target.LocalAddr(), target.RemoteAddr()).WriteTo(target); err != nil {

return

}

}

detectConn := &PostHandshakeRecordDetectConn{

Conn: target,

Key: key,

}

fingerprint := utls.HelloChrome_Auto

nextProtos := []string{"h2", "http/1.1"}

if alpn != 2 {

fingerprint = utls.HelloGolang

}

if alpn == 1 {

nextProtos = []string{"http/1.1"}

}

if alpn == 0 {

nextProtos = nil

}

uConn := utls.UClient(detectConn, &utls.Config{

ServerName: sni, // needs new loopvar behaviour

NextProtos: nextProtos,

}, fingerprint)

if err = uConn.Handshake(); err != nil {

return

}

io.Copy(io.Discard, uConn)

}()

go func() {

target, err := net.Dial(config.Type, config.Dest)

if err != nil {

return

}

if config.Xver == 1 || config.Xver == 2 {

if _, err = proxyproto.HeaderProxyFromAddrs(config.Xver, target.LocalAddr(), target.RemoteAddr()).WriteTo(target); err != nil {

return

}

}

fingerprint := utls.HelloChrome_Auto

nextProtos := []string{"h2", "http/1.1"}

if alpn != 2 {

fingerprint = utls.HelloGolang

}

if alpn == 1 {

nextProtos = []string{"http/1.1"}

}

if alpn == 0 {

nextProtos = nil

}

conn := &CCSDetectConn{

Conn: target,

Key: key,

}

uConn := utls.UClient(conn, &utls.Config{

ServerName: sni, // needs new loopvar behaviour

NextProtos: nextProtos,

}, fingerprint)

if err = uConn.Handshake(); err != nil {

return

}

}()

}

}

}

}

type PostHandshakeRecordDetectConn struct {

net.Conn

Key string

CcsSent bool

}

func (c *PostHandshakeRecordDetectConn) Write(b []byte) (n int, err error) {

if len(b) >= 3 && bytes.Equal(b[:3], []byte{20, 3, 3}) {

c.CcsSent = true

}

return c.Conn.Write(b)

}

func (c *PostHandshakeRecordDetectConn) Read(b []byte) (n int, err error) {

if !c.CcsSent {

return c.Conn.Read(b)

}

c.Conn.SetReadDeadline(time.Now().Add(5 * time.Second))

data, _ := io.ReadAll(c.Conn)

var postHandshakeRecordsLens []int

for {

if len(data) >= 5 && bytes.Equal(data[:3], []byte{23, 3, 3}) {

length := int(binary.BigEndian.Uint16(data[3:5])) + 5

postHandshakeRecordsLens = append(postHandshakeRecordsLens, length)

data = data[length:]

} else {

break

}

}

GlobalPostHandshakeRecordsLens.Store(c.Key, postHandshakeRecordsLens)

return 0, io.EOF

}

var CCSMsg = []byte{0x14, 0x3, 0x3, 0x0, 0x1, 0x1}

type CCSDetectConn struct {

net.Conn

Key string

}

func (c *CCSDetectConn) Write(b []byte) (n int, err error) {

if len(b) >= 3 && bytes.Equal(b[:3], []byte{20, 3, 3}) {

var hasAlert atomic.Bool

go func() {

defer hasAlert.Store(true)

buf := make([]byte, 512)

for {

_, err = c.Conn.Read(buf)

if err != nil {

return

}

if buf[0] == 0x15 {

return

}

}

}()

sendProbePayload := func(count int) bool {

msg := bytes.Repeat(CCSMsg, count)

c.Conn.Write(msg)

time.Sleep(1 * time.Second)

if hasAlert.Load() {

return true

}

return false

}

if sendProbePayload(2) {

GlobalMaxCSSMsgCount.Store(c.Key, 1)

return c.Conn.Write(b)

}

if sendProbePayload(15) {

GlobalMaxCSSMsgCount.Store(c.Key, 16)

return c.Conn.Write(b)

}

if sendProbePayload(16) {

GlobalMaxCSSMsgCount.Store(c.Key, 32)

return c.Conn.Write(b)

}

GlobalMaxCSSMsgCount.Store(c.Key, math.MaxInt)

return c.Conn.Write(b)

}

return c.Conn.Write(b)

}