frp/pkg/util/tcpmux/httpconnect.go

104 lines
2.6 KiB
Go

// 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"
gnet "github.com/fatedier/golib/net"
"github.com/fatedier/frp/pkg/util/util"
"github.com/fatedier/frp/pkg/util/vhost"
)
type HTTPConnectTCPMuxer struct {
*vhost.Muxer
passthrough bool
authRequired bool // Not supported until we really need this.
}
func NewHTTPConnectTCPMuxer(listener net.Listener, passthrough bool, timeout time.Duration) (*HTTPConnectTCPMuxer, error) {
ret := &HTTPConnectTCPMuxer{passthrough: passthrough, authRequired: false}
mux, err := vhost.NewMuxer(listener, ret.getHostFromHTTPConnect, nil, ret.sendConnectResponse, nil, timeout)
ret.Muxer = mux
return ret, err
}
func (muxer *HTTPConnectTCPMuxer) readHTTPConnectRequest(rd io.Reader) (host string, httpUser 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.CanonicalHost(req.Host)
proxyAuth := req.Header.Get("Proxy-Authorization")
if proxyAuth != "" {
httpUser, _, _ = util.ParseBasicAuth(proxyAuth)
}
return
}
func (muxer *HTTPConnectTCPMuxer) sendConnectResponse(c net.Conn, reqInfo map[string]string) error {
if muxer.passthrough {
return nil
}
res := util.OkResponse()
if res.Body != nil {
defer res.Body.Close()
}
return res.Write(c)
}
func (muxer *HTTPConnectTCPMuxer) getHostFromHTTPConnect(c net.Conn) (net.Conn, map[string]string, error) {
reqInfoMap := make(map[string]string, 0)
sc, rd := gnet.NewSharedConn(c)
host, httpUser, err := muxer.readHTTPConnectRequest(rd)
if err != nil {
return nil, reqInfoMap, err
}
reqInfoMap["Host"] = host
reqInfoMap["Scheme"] = "tcp"
reqInfoMap["HTTPUser"] = httpUser
outConn := c
if muxer.passthrough {
outConn = sc
if muxer.authRequired && httpUser == "" {
resp := util.ProxyUnauthorizedResponse()
if resp.Body != nil {
defer resp.Body.Close()
}
_ = resp.Write(c)
outConn = c
}
}
return outConn, reqInfoMap, nil
}