sing-box/transport/v2raywebsocket/conn.go
2023-07-11 15:44:03 +08:00

225 lines
4.6 KiB
Go

package v2raywebsocket
import (
"context"
"encoding/base64"
"io"
"net"
"net/http"
"os"
"time"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/buf"
E "github.com/sagernet/sing/common/exceptions"
"github.com/sagernet/websocket"
)
type WebsocketConn struct {
*websocket.Conn
*Writer
remoteAddr net.Addr
reader io.Reader
}
func NewServerConn(wsConn *websocket.Conn, remoteAddr net.Addr) *WebsocketConn {
return &WebsocketConn{
Conn: wsConn,
remoteAddr: remoteAddr,
Writer: NewWriter(wsConn, true),
}
}
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
}
func (c *WebsocketConn) Read(b []byte) (n int, err error) {
for {
if c.reader == nil {
_, c.reader, err = c.NextReader()
if err != nil {
err = wrapError(err)
return
}
}
n, err = c.reader.Read(b)
if E.IsMulti(err, io.EOF) {
c.reader = nil
continue
}
err = wrapError(err)
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.NetConn()
}
func (c *WebsocketConn) UpstreamWriter() any {
return c.Writer
}
type EarlyWebsocketConn struct {
*Client
ctx context.Context
conn *WebsocketConn
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 *websocket.Conn
response *http.Response
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, response, err = c.dialer.DialContext(c.ctx, requestURL.String(), c.headers)
} else {
headers := c.headers.Clone()
headers.Set(c.earlyDataHeaderName, earlyDataString)
conn, response, err = c.dialer.DialContext(c.ctx, c.requestURLString, headers)
}
} else {
conn, response, err = c.dialer.DialContext(c.ctx, c.requestURLString, c.headers)
}
if err != nil {
return wrapDialError(response, err)
}
c.conn = &WebsocketConn{Conn: conn, Writer: NewWriter(conn, false)}
if len(lateData) > 0 {
_, err = c.conn.Write(lateData)
}
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)
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)
}
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 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 {
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
}
func wrapError(err error) error {
if websocket.IsCloseError(err, websocket.CloseNormalClosure) {
return io.EOF
}
if websocket.IsCloseError(err, websocket.CloseAbnormalClosure) {
return net.ErrClosed
}
return err
}