sing-box/transport/v2raygrpclite/conn.go

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package v2raygrpclite
import (
std_bufio "bufio"
"bytes"
"encoding/binary"
"io"
"net"
"net/http"
"os"
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"sync"
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"time"
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"github.com/sagernet/sing-box/common/baderror"
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"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/bufio"
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M "github.com/sagernet/sing/common/metadata"
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"github.com/sagernet/sing/common/rw"
)
// kanged from: https://github.com/Qv2ray/gun-lite
var _ net.Conn = (*GunConn)(nil)
type GunConn struct {
reader *std_bufio.Reader
writer io.Writer
flusher http.Flusher
create chan struct{}
err error
readRemaining int
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writeAccess sync.Mutex
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}
func newGunConn(reader io.Reader, writer io.Writer, flusher http.Flusher) *GunConn {
return &GunConn{
reader: std_bufio.NewReader(reader),
writer: writer,
flusher: flusher,
}
}
func newLateGunConn(writer io.Writer) *GunConn {
return &GunConn{
create: make(chan struct{}),
writer: writer,
}
}
func (c *GunConn) setup(reader io.Reader, err error) {
c.reader = std_bufio.NewReader(reader)
c.err = err
close(c.create)
}
func (c *GunConn) Read(b []byte) (n int, err error) {
n, err = c.read(b)
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return n, baderror.WrapH2(err)
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}
func (c *GunConn) read(b []byte) (n int, err error) {
if c.reader == nil {
<-c.create
if c.err != nil {
return 0, c.err
}
}
if c.readRemaining > 0 {
if len(b) > c.readRemaining {
b = b[:c.readRemaining]
}
n, err = c.reader.Read(b)
c.readRemaining -= n
return
}
_, err = c.reader.Discard(6)
if err != nil {
return
}
dataLen, err := binary.ReadUvarint(c.reader)
if err != nil {
return
}
readLen := int(dataLen)
c.readRemaining = readLen
if len(b) > readLen {
b = b[:readLen]
}
n, err = c.reader.Read(b)
c.readRemaining -= n
return
}
func (c *GunConn) Write(b []byte) (n int, err error) {
protobufHeader := [1 + binary.MaxVarintLen64]byte{0x0A}
varuintLen := binary.PutUvarint(protobufHeader[1:], uint64(len(b)))
grpcHeader := buf.Get(5)
grpcPayloadLen := uint32(1 + varuintLen + len(b))
binary.BigEndian.PutUint32(grpcHeader[1:5], grpcPayloadLen)
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c.writeAccess.Lock()
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_, err = bufio.Copy(c.writer, io.MultiReader(bytes.NewReader(grpcHeader), bytes.NewReader(protobufHeader[:varuintLen+1]), bytes.NewReader(b)))
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c.writeAccess.Unlock()
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buf.Put(grpcHeader)
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if err == nil && c.flusher != nil {
c.flusher.Flush()
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}
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return len(b), baderror.WrapH2(err)
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}
func (c *GunConn) WriteBuffer(buffer *buf.Buffer) error {
defer buffer.Release()
dataLen := buffer.Len()
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varLen := rw.UVariantLen(uint64(dataLen))
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header := buffer.ExtendHeader(6 + varLen)
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_ = header[6]
header[0] = 0x00
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binary.BigEndian.PutUint32(header[1:5], uint32(1+varLen+dataLen))
header[5] = 0x0A
binary.PutUvarint(header[6:], uint64(dataLen))
err := rw.WriteBytes(c.writer, buffer.Bytes())
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if err == nil && c.flusher != nil {
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c.flusher.Flush()
}
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return baderror.WrapH2(err)
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}
func (c *GunConn) FrontHeadroom() int {
return 6 + binary.MaxVarintLen64
}
func (c *GunConn) Close() error {
return common.Close(c.reader, c.writer)
}
func (c *GunConn) LocalAddr() net.Addr {
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return M.Socksaddr{}
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}
func (c *GunConn) RemoteAddr() net.Addr {
return nil
}
func (c *GunConn) SetDeadline(t time.Time) error {
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return os.ErrInvalid
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}
func (c *GunConn) SetReadDeadline(t time.Time) error {
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return os.ErrInvalid
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}
func (c *GunConn) SetWriteDeadline(t time.Time) error {
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return os.ErrInvalid
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}
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func (c *GunConn) NeedAdditionalReadDeadline() bool {
return true
}