mirror of
https://github.com/fatedier/frp.git
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495d999b6c
* refactoring monitor code, support prometheus * remove vendor
207 lines
5.7 KiB
Go
207 lines
5.7 KiB
Go
// Copyright 2017 fatedier, fatedier@gmail.com
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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 vhost
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"log"
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"net"
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"net/http"
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"strings"
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"time"
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frpLog "github.com/fatedier/frp/utils/log"
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"github.com/fatedier/frp/utils/util"
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"github.com/fatedier/golib/pool"
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)
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var (
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ErrNoDomain = errors.New("no such domain")
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)
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type HttpReverseProxyOptions struct {
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ResponseHeaderTimeoutS int64
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}
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type HttpReverseProxy struct {
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proxy *ReverseProxy
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vhostRouter *VhostRouters
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responseHeaderTimeout time.Duration
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}
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func NewHttpReverseProxy(option HttpReverseProxyOptions, vhostRouter *VhostRouters) *HttpReverseProxy {
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if option.ResponseHeaderTimeoutS <= 0 {
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option.ResponseHeaderTimeoutS = 60
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}
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rp := &HttpReverseProxy{
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responseHeaderTimeout: time.Duration(option.ResponseHeaderTimeoutS) * time.Second,
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vhostRouter: vhostRouter,
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}
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proxy := &ReverseProxy{
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Director: func(req *http.Request) {
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req.URL.Scheme = "http"
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url := req.Context().Value("url").(string)
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oldHost := util.GetHostFromAddr(req.Context().Value("host").(string))
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host := rp.GetRealHost(oldHost, url)
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if host != "" {
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req.Host = host
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}
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req.URL.Host = req.Host
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headers := rp.GetHeaders(oldHost, url)
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for k, v := range headers {
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req.Header.Set(k, v)
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}
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},
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Transport: &http.Transport{
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ResponseHeaderTimeout: rp.responseHeaderTimeout,
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DisableKeepAlives: true,
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DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
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url := ctx.Value("url").(string)
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host := util.GetHostFromAddr(ctx.Value("host").(string))
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remote := ctx.Value("remote").(string)
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return rp.CreateConnection(host, url, remote)
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},
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},
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BufferPool: newWrapPool(),
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ErrorLog: log.New(newWrapLogger(), "", 0),
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ErrorHandler: func(rw http.ResponseWriter, req *http.Request, err error) {
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frpLog.Warn("do http proxy request error: %v", err)
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rw.WriteHeader(http.StatusNotFound)
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rw.Write(getNotFoundPageContent())
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},
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}
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rp.proxy = proxy
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return rp
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}
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// Register register the route config to reverse proxy
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// reverse proxy will use CreateConnFn from routeCfg to create a connection to the remote service
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func (rp *HttpReverseProxy) Register(routeCfg VhostRouteConfig) error {
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err := rp.vhostRouter.Add(routeCfg.Domain, routeCfg.Location, &routeCfg)
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if err != nil {
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return err
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}
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return nil
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}
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// UnRegister unregister route config by domain and location
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func (rp *HttpReverseProxy) UnRegister(domain string, location string) {
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rp.vhostRouter.Del(domain, location)
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}
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func (rp *HttpReverseProxy) GetRealHost(domain string, location string) (host string) {
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vr, ok := rp.getVhost(domain, location)
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if ok {
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host = vr.payload.(*VhostRouteConfig).RewriteHost
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}
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return
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}
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func (rp *HttpReverseProxy) GetHeaders(domain string, location string) (headers map[string]string) {
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vr, ok := rp.getVhost(domain, location)
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if ok {
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headers = vr.payload.(*VhostRouteConfig).Headers
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}
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return
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}
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// CreateConnection create a new connection by route config
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func (rp *HttpReverseProxy) CreateConnection(domain string, location string, remoteAddr string) (net.Conn, error) {
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vr, ok := rp.getVhost(domain, location)
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if ok {
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fn := vr.payload.(*VhostRouteConfig).CreateConnFn
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if fn != nil {
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return fn(remoteAddr)
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}
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}
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return nil, fmt.Errorf("%v: %s %s", ErrNoDomain, domain, location)
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}
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func (rp *HttpReverseProxy) CheckAuth(domain, location, user, passwd string) bool {
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vr, ok := rp.getVhost(domain, location)
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if ok {
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checkUser := vr.payload.(*VhostRouteConfig).Username
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checkPasswd := vr.payload.(*VhostRouteConfig).Password
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if (checkUser != "" || checkPasswd != "") && (checkUser != user || checkPasswd != passwd) {
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return false
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}
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}
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return true
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}
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// getVhost get vhost router by domain and location
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func (rp *HttpReverseProxy) getVhost(domain string, location string) (vr *VhostRouter, ok bool) {
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// first we check the full hostname
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// if not exist, then check the wildcard_domain such as *.example.com
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vr, ok = rp.vhostRouter.Get(domain, location)
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if ok {
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return
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}
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domainSplit := strings.Split(domain, ".")
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if len(domainSplit) < 3 {
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return nil, false
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}
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for {
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if len(domainSplit) < 3 {
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return nil, false
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}
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domainSplit[0] = "*"
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domain = strings.Join(domainSplit, ".")
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vr, ok = rp.vhostRouter.Get(domain, location)
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if ok {
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return vr, true
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}
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domainSplit = domainSplit[1:]
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}
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}
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func (rp *HttpReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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domain := util.GetHostFromAddr(req.Host)
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location := req.URL.Path
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user, passwd, _ := req.BasicAuth()
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if !rp.CheckAuth(domain, location, user, passwd) {
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rw.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
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http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
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return
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}
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rp.proxy.ServeHTTP(rw, req)
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}
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type wrapPool struct{}
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func newWrapPool() *wrapPool { return &wrapPool{} }
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func (p *wrapPool) Get() []byte { return pool.GetBuf(32 * 1024) }
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func (p *wrapPool) Put(buf []byte) { pool.PutBuf(buf) }
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type wrapLogger struct{}
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func newWrapLogger() *wrapLogger { return &wrapLogger{} }
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func (l *wrapLogger) Write(p []byte) (n int, err error) {
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frpLog.Warn("%s", string(bytes.TrimRight(p, "\n")))
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return len(p), nil
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}
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