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95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
// Copyright 2020 guylewin, guy@lewin.co.il
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcpmux
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"net/http"
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"time"
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"github.com/fatedier/frp/pkg/util/util"
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"github.com/fatedier/frp/pkg/util/vhost"
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gnet "github.com/fatedier/golib/net"
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)
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type HTTPConnectTCPMuxer struct {
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*vhost.Muxer
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passthrough bool
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authRequired bool // Not supported until we really need this.
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}
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func NewHTTPConnectTCPMuxer(listener net.Listener, passthrough bool, timeout time.Duration) (*HTTPConnectTCPMuxer, error) {
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ret := &HTTPConnectTCPMuxer{passthrough: passthrough, authRequired: false}
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mux, err := vhost.NewMuxer(listener, ret.getHostFromHTTPConnect, nil, ret.sendConnectResponse, nil, timeout)
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ret.Muxer = mux
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return ret, err
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}
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func (muxer *HTTPConnectTCPMuxer) readHTTPConnectRequest(rd io.Reader) (host string, httpUser string, err error) {
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bufioReader := bufio.NewReader(rd)
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req, err := http.ReadRequest(bufioReader)
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if err != nil {
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return
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}
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if req.Method != "CONNECT" {
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err = fmt.Errorf("connections to tcp vhost must be of method CONNECT")
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return
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}
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host, _ = util.CanonicalHost(req.Host)
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proxyAuth := req.Header.Get("Proxy-Authorization")
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if proxyAuth != "" {
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httpUser, _, _ = util.ParseBasicAuth(proxyAuth)
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}
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return
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}
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func (muxer *HTTPConnectTCPMuxer) sendConnectResponse(c net.Conn, reqInfo map[string]string) error {
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if muxer.passthrough {
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return nil
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}
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return util.OkResponse().Write(c)
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}
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func (muxer *HTTPConnectTCPMuxer) getHostFromHTTPConnect(c net.Conn) (net.Conn, map[string]string, error) {
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reqInfoMap := make(map[string]string, 0)
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sc, rd := gnet.NewSharedConn(c)
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host, httpUser, err := muxer.readHTTPConnectRequest(rd)
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if err != nil {
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return nil, reqInfoMap, err
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}
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reqInfoMap["Host"] = host
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reqInfoMap["Scheme"] = "tcp"
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reqInfoMap["HTTPUser"] = httpUser
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var outConn net.Conn = c
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if muxer.passthrough {
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outConn = sc
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if muxer.authRequired && httpUser == "" {
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util.ProxyUnauthorizedResponse().Write(c)
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outConn = c
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}
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}
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return outConn, reqInfoMap, nil
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}
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