127 lines
1.9 KiB
Go
127 lines
1.9 KiB
Go
package tun2
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"encoding/json"
|
|
"errors"
|
|
"net"
|
|
"net/http"
|
|
"net/http/httputil"
|
|
"net/url"
|
|
|
|
kcp "github.com/xtaci/kcp-go"
|
|
"github.com/xtaci/smux"
|
|
)
|
|
|
|
type Client struct {
|
|
cfg *ClientConfig
|
|
}
|
|
|
|
type ClientConfig struct {
|
|
TLSConfig *tls.Config
|
|
ConnType string
|
|
ServerAddr string
|
|
Token string
|
|
Domain string
|
|
BackendURL string
|
|
}
|
|
|
|
func NewClient(cfg *ClientConfig) (*Client, error) {
|
|
if cfg == nil {
|
|
return nil, errors.New("tun2: client config needed")
|
|
}
|
|
|
|
c := &Client{
|
|
cfg: cfg,
|
|
}
|
|
|
|
return c, nil
|
|
}
|
|
|
|
func (c *Client) connect(serverAddr string) error {
|
|
target, err := url.Parse(c.cfg.BackendURL)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
s := &http.Server{
|
|
Handler: httputil.NewSingleHostReverseProxy(target),
|
|
}
|
|
|
|
var conn net.Conn
|
|
|
|
switch c.cfg.ConnType {
|
|
case "tcp":
|
|
conn, err = tls.Dial("tcp", serverAddr, c.cfg.TLSConfig)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
case "kcp":
|
|
kc, err := kcp.Dial(serverAddr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer kc.Close()
|
|
|
|
serverHost, _, _ := net.SplitHostPort(serverAddr)
|
|
|
|
tc := c.cfg.TLSConfig.Clone()
|
|
tc.ServerName = serverHost
|
|
conn = tls.Client(kc, tc)
|
|
}
|
|
defer conn.Close()
|
|
|
|
session, err := smux.Client(conn, smux.DefaultConfig())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer session.Close()
|
|
|
|
controlStream, err := session.AcceptStream()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
authData, err := json.Marshal(&Auth{
|
|
Token: c.cfg.Token,
|
|
Domain: c.cfg.Domain,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = controlStream.Write(authData)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
err = s.Serve(&smuxListener{
|
|
conn: conn,
|
|
session: session,
|
|
})
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
type smuxListener struct {
|
|
conn net.Conn
|
|
session *smux.Session
|
|
}
|
|
|
|
func (sl *smuxListener) Accept() (net.Conn, error) {
|
|
return sl.session.AcceptStream()
|
|
}
|
|
|
|
func (sl *smuxListener) Addr() net.Addr {
|
|
return sl.conn.LocalAddr()
|
|
}
|
|
|
|
func (sl *smuxListener) Close() error {
|
|
return sl.session.Close()
|
|
}
|