sing-box/transport/v2raywebsocket/conn.go

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package v2raywebsocket
import (
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"context"
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"encoding/base64"
"io"
"net"
"net/http"
"os"
"time"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/buf"
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E "github.com/sagernet/sing/common/exceptions"
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"github.com/sagernet/websocket"
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)
type WebsocketConn struct {
*websocket.Conn
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*Writer
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remoteAddr net.Addr
reader io.Reader
}
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func NewServerConn(wsConn *websocket.Conn, remoteAddr net.Addr) *WebsocketConn {
return &WebsocketConn{
Conn: wsConn,
remoteAddr: remoteAddr,
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Writer: NewWriter(wsConn, true),
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}
}
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func (c *WebsocketConn) Close() error {
err := c.WriteControl(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""), time.Now().Add(C.TCPTimeout))
if err != nil {
return c.Conn.Close()
}
return nil
}
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func (c *WebsocketConn) Read(b []byte) (n int, err error) {
for {
if c.reader == nil {
_, c.reader, err = c.NextReader()
if err != nil {
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err = wrapError(err)
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return
}
}
n, err = c.reader.Read(b)
if E.IsMulti(err, io.EOF) {
c.reader = nil
continue
}
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err = wrapError(err)
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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
}
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func (c *WebsocketConn) SetReadDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *WebsocketConn) SetWriteDeadline(t time.Time) error {
return os.ErrInvalid
}
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func (c *WebsocketConn) NeedAdditionalReadDeadline() bool {
return true
}
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func (c *WebsocketConn) Upstream() any {
return c.Conn.NetConn()
}
func (c *WebsocketConn) UpstreamWriter() any {
return c.Writer
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}
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type EarlyWebsocketConn struct {
*Client
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ctx context.Context
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conn *WebsocketConn
create chan struct{}
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err error
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}
func (c *EarlyWebsocketConn) Read(b []byte) (n int, err error) {
if c.conn == nil {
<-c.create
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if c.err != nil {
return 0, c.err
}
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}
return c.conn.Read(b)
}
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func (c *EarlyWebsocketConn) writeRequest(content []byte) error {
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var (
earlyData []byte
lateData []byte
conn *websocket.Conn
response *http.Response
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err error
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)
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if len(content) > int(c.maxEarlyData) {
earlyData = content[:c.maxEarlyData]
lateData = content[c.maxEarlyData:]
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} else {
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earlyData = content
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}
if len(earlyData) > 0 {
earlyDataString := base64.RawURLEncoding.EncodeToString(earlyData)
if c.earlyDataHeaderName == "" {
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requestURL := c.requestURL
requestURL.Path += earlyDataString
conn, response, err = c.dialer.DialContext(c.ctx, requestURL.String(), c.headers)
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} else {
headers := c.headers.Clone()
headers.Set(c.earlyDataHeaderName, earlyDataString)
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conn, response, err = c.dialer.DialContext(c.ctx, c.requestURLString, headers)
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}
} else {
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conn, response, err = c.dialer.DialContext(c.ctx, c.requestURLString, c.headers)
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}
if err != nil {
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return wrapDialError(response, err)
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}
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c.conn = &WebsocketConn{Conn: conn, Writer: NewWriter(conn, false)}
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if len(lateData) > 0 {
_, err = c.conn.Write(lateData)
}
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return err
}
func (c *EarlyWebsocketConn) Write(b []byte) (n int, err error) {
if c.conn != nil {
return c.conn.Write(b)
}
err = c.writeRequest(b)
c.err = err
close(c.create)
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if err != nil {
return
}
return len(b), nil
}
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func (c *EarlyWebsocketConn) WriteBuffer(buffer *buf.Buffer) error {
if c.conn != nil {
return c.conn.WriteBuffer(buffer)
}
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err := c.writeRequest(buffer.Bytes())
c.err = err
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close(c.create)
return err
}
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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 nil
}
return c.conn.LocalAddr()
}
func (c *EarlyWebsocketConn) RemoteAddr() net.Addr {
if c.conn == nil {
return nil
}
return c.conn.RemoteAddr()
}
func (c *EarlyWebsocketConn) SetDeadline(t time.Time) error {
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return os.ErrInvalid
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}
func (c *EarlyWebsocketConn) SetReadDeadline(t time.Time) error {
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return os.ErrInvalid
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}
func (c *EarlyWebsocketConn) SetWriteDeadline(t time.Time) error {
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return os.ErrInvalid
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}
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func (c *EarlyWebsocketConn) NeedAdditionalReadDeadline() bool {
return true
}
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func (c *EarlyWebsocketConn) Upstream() any {
return common.PtrOrNil(c.conn)
}
func (c *EarlyWebsocketConn) LazyHeadroom() bool {
return c.conn == nil
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}
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func wrapError(err error) error {
if websocket.IsCloseError(err, websocket.CloseNormalClosure) {
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return io.EOF
}
if websocket.IsCloseError(err, websocket.CloseAbnormalClosure) {
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return net.ErrClosed
}
return err
}