mirror of
https://gitclone.com/github.com/MetaCubeX/Clash.Meta
synced 2024-11-15 13:41:23 +08:00
303 lines
7.3 KiB
Go
303 lines
7.3 KiB
Go
package vision
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/subtle"
|
|
gotls "crypto/tls"
|
|
"encoding/binary"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
|
|
"github.com/metacubex/mihomo/common/buf"
|
|
N "github.com/metacubex/mihomo/common/net"
|
|
"github.com/metacubex/mihomo/log"
|
|
|
|
"github.com/gofrs/uuid/v5"
|
|
utls "github.com/sagernet/utls"
|
|
)
|
|
|
|
var (
|
|
_ N.ExtendedConn = (*Conn)(nil)
|
|
)
|
|
|
|
type Conn struct {
|
|
net.Conn
|
|
N.ExtendedReader
|
|
N.ExtendedWriter
|
|
upstream net.Conn
|
|
userUUID *uuid.UUID
|
|
|
|
tlsConn net.Conn
|
|
input *bytes.Reader
|
|
rawInput *bytes.Buffer
|
|
|
|
needHandshake bool
|
|
packetsToFilter int
|
|
isTLS bool
|
|
isTLS12orAbove bool
|
|
enableXTLS bool
|
|
cipher uint16
|
|
remainingServerHello uint16
|
|
readRemainingContent int
|
|
readRemainingPadding int
|
|
readProcess bool
|
|
readFilterUUID bool
|
|
readLastCommand byte
|
|
writeFilterApplicationData bool
|
|
writeDirect bool
|
|
}
|
|
|
|
func (vc *Conn) Read(b []byte) (int, error) {
|
|
if vc.readProcess {
|
|
buffer := buf.With(b)
|
|
err := vc.ReadBuffer(buffer)
|
|
return buffer.Len(), err
|
|
}
|
|
return vc.ExtendedReader.Read(b)
|
|
}
|
|
|
|
func (vc *Conn) ReadBuffer(buffer *buf.Buffer) error {
|
|
toRead := buffer.FreeBytes()
|
|
if vc.readRemainingContent > 0 {
|
|
if vc.readRemainingContent < buffer.FreeLen() {
|
|
toRead = toRead[:vc.readRemainingContent]
|
|
}
|
|
n, err := vc.ExtendedReader.Read(toRead)
|
|
buffer.Truncate(n)
|
|
vc.readRemainingContent -= n
|
|
vc.FilterTLS(toRead)
|
|
return err
|
|
}
|
|
if vc.readRemainingPadding > 0 {
|
|
_, err := io.CopyN(io.Discard, vc.ExtendedReader, int64(vc.readRemainingPadding))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
vc.readRemainingPadding = 0
|
|
}
|
|
if vc.readProcess {
|
|
switch vc.readLastCommand {
|
|
case commandPaddingContinue:
|
|
//if vc.isTLS || vc.packetsToFilter > 0 {
|
|
headerUUIDLen := 0
|
|
if vc.readFilterUUID {
|
|
headerUUIDLen = uuid.Size
|
|
}
|
|
var header []byte
|
|
if need := headerUUIDLen + PaddingHeaderLen - uuid.Size; buffer.FreeLen() < need {
|
|
header = make([]byte, need)
|
|
} else {
|
|
header = buffer.FreeBytes()[:need]
|
|
}
|
|
_, err := io.ReadFull(vc.ExtendedReader, header)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if vc.readFilterUUID {
|
|
vc.readFilterUUID = false
|
|
if subtle.ConstantTimeCompare(vc.userUUID.Bytes(), header[:uuid.Size]) != 1 {
|
|
err = fmt.Errorf("XTLS Vision server responded unknown UUID: %s",
|
|
uuid.FromBytesOrNil(header[:uuid.Size]).String())
|
|
log.Errorln(err.Error())
|
|
return err
|
|
}
|
|
header = header[uuid.Size:]
|
|
}
|
|
vc.readRemainingPadding = int(binary.BigEndian.Uint16(header[3:]))
|
|
vc.readRemainingContent = int(binary.BigEndian.Uint16(header[1:]))
|
|
vc.readLastCommand = header[0]
|
|
log.Debugln("XTLS Vision read padding: command=%d, payloadLen=%d, paddingLen=%d",
|
|
vc.readLastCommand, vc.readRemainingContent, vc.readRemainingPadding)
|
|
return vc.ReadBuffer(buffer)
|
|
//}
|
|
case commandPaddingEnd:
|
|
vc.readProcess = false
|
|
return vc.ReadBuffer(buffer)
|
|
case commandPaddingDirect:
|
|
needReturn := false
|
|
if vc.input != nil {
|
|
_, err := buffer.ReadFrom(vc.input)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if vc.input.Len() == 0 {
|
|
needReturn = true
|
|
vc.input = nil
|
|
} else { // buffer is full
|
|
return nil
|
|
}
|
|
}
|
|
if vc.rawInput != nil {
|
|
_, err := buffer.ReadFrom(vc.rawInput)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
needReturn = true
|
|
if vc.rawInput.Len() == 0 {
|
|
vc.rawInput = nil
|
|
}
|
|
}
|
|
if vc.input == nil && vc.rawInput == nil {
|
|
vc.readProcess = false
|
|
vc.ExtendedReader = N.NewExtendedReader(vc.Conn)
|
|
log.Debugln("XTLS Vision direct read start")
|
|
}
|
|
if needReturn {
|
|
return nil
|
|
}
|
|
default:
|
|
err := fmt.Errorf("XTLS Vision read unknown command: %d", vc.readLastCommand)
|
|
log.Debugln(err.Error())
|
|
return err
|
|
}
|
|
}
|
|
return vc.ExtendedReader.ReadBuffer(buffer)
|
|
}
|
|
|
|
func (vc *Conn) Write(p []byte) (int, error) {
|
|
if vc.writeFilterApplicationData {
|
|
buffer := buf.New()
|
|
defer buffer.Release()
|
|
buffer.Write(p)
|
|
err := vc.WriteBuffer(buffer)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return len(p), nil
|
|
}
|
|
return vc.ExtendedWriter.Write(p)
|
|
}
|
|
|
|
func (vc *Conn) WriteBuffer(buffer *buf.Buffer) (err error) {
|
|
if vc.needHandshake {
|
|
vc.needHandshake = false
|
|
if buffer.IsEmpty() {
|
|
ApplyPadding(buffer, commandPaddingContinue, vc.userUUID, false)
|
|
} else {
|
|
vc.FilterTLS(buffer.Bytes())
|
|
ApplyPadding(buffer, commandPaddingContinue, vc.userUUID, vc.isTLS)
|
|
}
|
|
err = vc.ExtendedWriter.WriteBuffer(buffer)
|
|
if err != nil {
|
|
buffer.Release()
|
|
return err
|
|
}
|
|
switch underlying := vc.tlsConn.(type) {
|
|
case *gotls.Conn:
|
|
if underlying.ConnectionState().Version != gotls.VersionTLS13 {
|
|
buffer.Release()
|
|
return ErrNotTLS13
|
|
}
|
|
case *utls.UConn:
|
|
if underlying.ConnectionState().Version != utls.VersionTLS13 {
|
|
buffer.Release()
|
|
return ErrNotTLS13
|
|
}
|
|
}
|
|
vc.tlsConn = nil
|
|
return nil
|
|
}
|
|
|
|
if vc.writeFilterApplicationData {
|
|
buffer2 := ReshapeBuffer(buffer)
|
|
defer buffer2.Release()
|
|
vc.FilterTLS(buffer.Bytes())
|
|
command := commandPaddingContinue
|
|
if !vc.isTLS {
|
|
command = commandPaddingEnd
|
|
|
|
// disable XTLS
|
|
//vc.readProcess = false
|
|
vc.writeFilterApplicationData = false
|
|
vc.packetsToFilter = 0
|
|
} else if buffer.Len() > 6 && bytes.Equal(buffer.To(3), tlsApplicationDataStart) || vc.packetsToFilter <= 0 {
|
|
command = commandPaddingEnd
|
|
if vc.enableXTLS {
|
|
command = commandPaddingDirect
|
|
vc.writeDirect = true
|
|
}
|
|
vc.writeFilterApplicationData = false
|
|
}
|
|
ApplyPadding(buffer, command, nil, vc.isTLS)
|
|
err = vc.ExtendedWriter.WriteBuffer(buffer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if vc.writeDirect {
|
|
vc.ExtendedWriter = N.NewExtendedWriter(vc.Conn)
|
|
log.Debugln("XTLS Vision direct write start")
|
|
//time.Sleep(5 * time.Millisecond)
|
|
}
|
|
if buffer2 != nil {
|
|
if vc.writeDirect || !vc.isTLS {
|
|
return vc.ExtendedWriter.WriteBuffer(buffer2)
|
|
}
|
|
vc.FilterTLS(buffer2.Bytes())
|
|
command = commandPaddingContinue
|
|
if buffer2.Len() > 6 && bytes.Equal(buffer2.To(3), tlsApplicationDataStart) || vc.packetsToFilter <= 0 {
|
|
command = commandPaddingEnd
|
|
if vc.enableXTLS {
|
|
command = commandPaddingDirect
|
|
vc.writeDirect = true
|
|
}
|
|
vc.writeFilterApplicationData = false
|
|
}
|
|
ApplyPadding(buffer2, command, nil, vc.isTLS)
|
|
err = vc.ExtendedWriter.WriteBuffer(buffer2)
|
|
if vc.writeDirect {
|
|
vc.ExtendedWriter = N.NewExtendedWriter(vc.Conn)
|
|
log.Debugln("XTLS Vision direct write start")
|
|
//time.Sleep(10 * time.Millisecond)
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
/*if vc.writeDirect {
|
|
log.Debugln("XTLS Vision Direct write, payloadLen=%d", buffer.Len())
|
|
}*/
|
|
return vc.ExtendedWriter.WriteBuffer(buffer)
|
|
}
|
|
|
|
func (vc *Conn) FrontHeadroom() int {
|
|
if vc.readFilterUUID {
|
|
return PaddingHeaderLen
|
|
}
|
|
return PaddingHeaderLen - uuid.Size
|
|
}
|
|
|
|
func (vc *Conn) NeedHandshake() bool {
|
|
return vc.needHandshake
|
|
}
|
|
|
|
func (vc *Conn) Upstream() any {
|
|
if vc.writeDirect ||
|
|
vc.readLastCommand == commandPaddingDirect {
|
|
return vc.Conn
|
|
}
|
|
return vc.upstream
|
|
}
|
|
|
|
func (vc *Conn) ReaderPossiblyReplaceable() bool {
|
|
return vc.readProcess
|
|
}
|
|
|
|
func (vc *Conn) ReaderReplaceable() bool {
|
|
if !vc.readProcess &&
|
|
vc.readLastCommand == commandPaddingDirect {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (vc *Conn) WriterPossiblyReplaceable() bool {
|
|
return vc.writeFilterApplicationData
|
|
}
|
|
|
|
func (vc *Conn) WriterReplaceable() bool {
|
|
if vc.writeDirect {
|
|
return true
|
|
}
|
|
return false
|
|
}
|