frp/utils/net/websocket.go

104 lines
1.9 KiB
Go

package net
import (
"errors"
"fmt"
"net"
"net/http"
"net/url"
"time"
"golang.org/x/net/websocket"
)
var (
ErrWebsocketListenerClosed = errors.New("websocket listener closed")
)
const (
FrpWebsocketPath = "/~!frp"
)
type WebsocketListener struct {
ln net.Listener
acceptCh chan net.Conn
server *http.Server
httpMutex *http.ServeMux
}
// NewWebsocketListener to handle websocket connections
// ln: tcp listener for websocket connections
func NewWebsocketListener(ln net.Listener) (wl *WebsocketListener) {
wl = &WebsocketListener{
acceptCh: make(chan net.Conn),
}
muxer := http.NewServeMux()
muxer.Handle(FrpWebsocketPath, websocket.Handler(func(c *websocket.Conn) {
notifyCh := make(chan struct{})
conn := WrapCloseNotifyConn(c, func() {
close(notifyCh)
})
wl.acceptCh <- conn
<-notifyCh
}))
wl.server = &http.Server{
Addr: ln.Addr().String(),
Handler: muxer,
}
go wl.server.Serve(ln)
return
}
func ListenWebsocket(bindAddr string, bindPort int) (*WebsocketListener, error) {
tcpLn, err := net.Listen("tcp", fmt.Sprintf("%s:%d", bindAddr, bindPort))
if err != nil {
return nil, err
}
l := NewWebsocketListener(tcpLn)
return l, nil
}
func (p *WebsocketListener) Accept() (net.Conn, error) {
c, ok := <-p.acceptCh
if !ok {
return nil, ErrWebsocketListenerClosed
}
return c, nil
}
func (p *WebsocketListener) Close() error {
return p.server.Close()
}
func (p *WebsocketListener) Addr() net.Addr {
return p.ln.Addr()
}
// addr: domain:port
func ConnectWebsocketServer(addr string) (net.Conn, error) {
addr = "ws://" + addr + FrpWebsocketPath
uri, err := url.Parse(addr)
if err != nil {
return nil, err
}
origin := "http://" + uri.Host
cfg, err := websocket.NewConfig(addr, origin)
if err != nil {
return nil, err
}
cfg.Dialer = &net.Dialer{
Timeout: 10 * time.Second,
}
conn, err := websocket.DialConfig(cfg)
if err != nil {
return nil, err
}
return conn, nil
}