sing-box/transport/v2raywebsocket/conn.go
2023-12-05 15:11:09 +08:00

271 lines
5.3 KiB
Go

package v2raywebsocket
import (
"context"
"encoding/base64"
"io"
"net"
"os"
"sync"
"time"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/debug"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
"github.com/sagernet/ws"
"github.com/sagernet/ws/wsutil"
)
type WebsocketConn struct {
net.Conn
*Writer
state ws.State
reader *wsutil.Reader
controlHandler wsutil.FrameHandlerFunc
remoteAddr net.Addr
}
func NewConn(conn net.Conn, remoteAddr net.Addr, state ws.State) *WebsocketConn {
controlHandler := wsutil.ControlFrameHandler(conn, state)
return &WebsocketConn{
Conn: conn,
state: state,
reader: &wsutil.Reader{
Source: conn,
State: state,
SkipHeaderCheck: !debug.Enabled,
OnIntermediate: controlHandler,
},
controlHandler: controlHandler,
remoteAddr: remoteAddr,
Writer: NewWriter(conn, state),
}
}
func (c *WebsocketConn) Close() error {
c.Conn.SetWriteDeadline(time.Now().Add(C.TCPTimeout))
frame := ws.NewCloseFrame(ws.NewCloseFrameBody(
ws.StatusNormalClosure, "",
))
if c.state == ws.StateClientSide {
frame = ws.MaskFrameInPlace(frame)
}
ws.WriteFrame(c.Conn, frame)
c.Conn.Close()
return nil
}
func (c *WebsocketConn) Read(b []byte) (n int, err error) {
var header ws.Header
for {
n, err = c.reader.Read(b)
if n > 0 {
err = nil
return
}
if !E.IsMulti(err, io.EOF, wsutil.ErrNoFrameAdvance) {
return
}
header, err = c.reader.NextFrame()
if err != nil {
return
}
if header.OpCode.IsControl() {
err = c.controlHandler(header, c.reader)
if err != nil {
return
}
continue
}
if header.OpCode&ws.OpBinary == 0 {
err = c.reader.Discard()
if err != nil {
return
}
continue
}
}
}
func (c *WebsocketConn) Write(p []byte) (n int, err error) {
err = wsutil.WriteMessage(c.Conn, c.state, ws.OpBinary, p)
if err != nil {
return
}
n = len(p)
return
}
func (c *WebsocketConn) RemoteAddr() net.Addr {
if c.remoteAddr != nil {
return c.remoteAddr
}
return c.Conn.RemoteAddr()
}
func (c *WebsocketConn) SetDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *WebsocketConn) SetReadDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *WebsocketConn) SetWriteDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *WebsocketConn) NeedAdditionalReadDeadline() bool {
return true
}
func (c *WebsocketConn) Upstream() any {
return c.Conn
}
type EarlyWebsocketConn struct {
*Client
ctx context.Context
conn *WebsocketConn
access sync.Mutex
create chan struct{}
err error
}
func (c *EarlyWebsocketConn) Read(b []byte) (n int, err error) {
if c.conn == nil {
<-c.create
if c.err != nil {
return 0, c.err
}
}
return c.conn.Read(b)
}
func (c *EarlyWebsocketConn) writeRequest(content []byte) error {
var (
earlyData []byte
lateData []byte
conn *WebsocketConn
err error
)
if len(content) > int(c.maxEarlyData) {
earlyData = content[:c.maxEarlyData]
lateData = content[c.maxEarlyData:]
} else {
earlyData = content
}
if len(earlyData) > 0 {
earlyDataString := base64.RawURLEncoding.EncodeToString(earlyData)
if c.earlyDataHeaderName == "" {
requestURL := c.requestURL
requestURL.Path += earlyDataString
conn, err = c.dialContext(c.ctx, &requestURL, c.headers)
} else {
headers := c.headers.Clone()
headers.Set(c.earlyDataHeaderName, earlyDataString)
conn, err = c.dialContext(c.ctx, &c.requestURL, headers)
}
} else {
conn, err = c.dialContext(c.ctx, &c.requestURL, c.headers)
}
if err != nil {
return err
}
if len(lateData) > 0 {
_, err = conn.Write(lateData)
if err != nil {
return err
}
}
c.conn = conn
return nil
}
func (c *EarlyWebsocketConn) Write(b []byte) (n int, err error) {
if c.conn != nil {
return c.conn.Write(b)
}
c.access.Lock()
defer c.access.Unlock()
if c.err != nil {
return 0, c.err
}
if c.conn != nil {
return c.conn.Write(b)
}
err = c.writeRequest(b)
c.err = err
close(c.create)
if err != nil {
return
}
return len(b), nil
}
func (c *EarlyWebsocketConn) WriteBuffer(buffer *buf.Buffer) error {
if c.conn != nil {
return c.conn.WriteBuffer(buffer)
}
c.access.Lock()
defer c.access.Unlock()
if c.conn != nil {
return c.conn.WriteBuffer(buffer)
}
if c.err != nil {
return c.err
}
err := c.writeRequest(buffer.Bytes())
c.err = err
close(c.create)
return err
}
func (c *EarlyWebsocketConn) Close() error {
if c.conn == nil {
return nil
}
return c.conn.Close()
}
func (c *EarlyWebsocketConn) LocalAddr() net.Addr {
if c.conn == nil {
return M.Socksaddr{}
}
return c.conn.LocalAddr()
}
func (c *EarlyWebsocketConn) RemoteAddr() net.Addr {
if c.conn == nil {
return M.Socksaddr{}
}
return c.conn.RemoteAddr()
}
func (c *EarlyWebsocketConn) SetDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *EarlyWebsocketConn) SetReadDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *EarlyWebsocketConn) SetWriteDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *EarlyWebsocketConn) NeedAdditionalReadDeadline() bool {
return true
}
func (c *EarlyWebsocketConn) Upstream() any {
return common.PtrOrNil(c.conn)
}
func (c *EarlyWebsocketConn) LazyHeadroom() bool {
return c.conn == nil
}