frp/utils/tcpmux/httpconnect.go

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// Copyright 2020 guylewin, guy@lewin.co.il
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tcpmux
import (
"bufio"
"fmt"
"io"
"net"
"net/http"
"time"
"github.com/fatedier/frp/utils/util"
"github.com/fatedier/frp/utils/vhost"
)
type HttpConnectTcpMuxer struct {
*vhost.VhostMuxer
}
func NewHttpConnectTcpMuxer(listener net.Listener, timeout time.Duration) (*HttpConnectTcpMuxer, error) {
mux, err := vhost.NewVhostMuxer(listener, getHostFromHttpConnect, nil, sendHttpOk, nil, timeout)
return &HttpConnectTcpMuxer{mux}, err
}
func readHttpConnectRequest(rd io.Reader) (host string, err error) {
bufioReader := bufio.NewReader(rd)
req, err := http.ReadRequest(bufioReader)
if err != nil {
return
}
if req.Method != "CONNECT" {
err = fmt.Errorf("connections to tcp vhost must be of method CONNECT")
return
}
host = util.GetHostFromAddr(req.Host)
return
}
func sendHttpOk(c net.Conn) error {
return util.OkResponse().Write(c)
}
func getHostFromHttpConnect(c net.Conn) (_ net.Conn, _ map[string]string, err error) {
reqInfoMap := make(map[string]string, 0)
host, err := readHttpConnectRequest(c)
if err != nil {
return nil, reqInfoMap, err
}
reqInfoMap["Host"] = host
reqInfoMap["Scheme"] = "tcp"
return c, reqInfoMap, nil
}