mirror of
https://github.com/fatedier/frp.git
synced 2024-12-16 03:19:00 +08:00
178 lines
4.3 KiB
Go
178 lines
4.3 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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"context"
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"errors"
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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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"sync"
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"time"
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frpLog "github.com/fatedier/frp/utils/log"
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frpNet "github.com/fatedier/frp/utils/net"
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"github.com/fatedier/frp/utils/pool"
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)
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var (
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responseHeaderTimeout = time.Duration(30) * time.Second
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ErrRouterConfigConflict = errors.New("router config conflict")
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ErrNoDomain = errors.New("no such domain")
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)
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func getHostFromAddr(addr string) (host string) {
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strs := strings.Split(addr, ":")
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if len(strs) > 1 {
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host = strs[0]
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} else {
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host = addr
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}
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return
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}
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type CreateConnFunc func() (frpNet.Conn, error)
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type ProxyOption struct {
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RewriteHost string
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DialFunc CreateConnFunc
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}
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type HttpReverseProxy struct {
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proxy *ReverseProxy
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tr *http.Transport
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vhostRouter *VhostRouters
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cfgMu sync.RWMutex
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}
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func NewHttpReverseProxy() *HttpReverseProxy {
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rp := &HttpReverseProxy{
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vhostRouter: NewVhostRouters(),
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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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host := getHostFromAddr(req.Context().Value("host").(string))
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host = rp.GetRealHost(host, url)
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if host != "" {
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req.Host = host
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req.URL.Host = req.Host
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}
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},
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Transport: &http.Transport{
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ResponseHeaderTimeout: 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 := getHostFromAddr(ctx.Value("host").(string))
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return rp.CreateConnection(host, url)
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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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}
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rp.proxy = proxy
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return rp
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}
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func (rp *HttpReverseProxy) Register(domain string, location string, rewriteHost string, fn CreateConnFunc) error {
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rp.cfgMu.Lock()
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defer rp.cfgMu.Unlock()
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_, ok := rp.vhostRouter.Exist(domain, location)
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if ok {
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return ErrRouterConfigConflict
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} else {
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payload := &ProxyOption{
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RewriteHost: rewriteHost,
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DialFunc: fn,
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}
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rp.vhostRouter.Add(domain, location, payload)
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}
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return nil
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}
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func (rp *HttpReverseProxy) UnRegister(domain string, location string) {
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rp.cfgMu.Lock()
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defer rp.cfgMu.Unlock()
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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.(*ProxyOption).RewriteHost
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}
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return
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}
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func (rp *HttpReverseProxy) CreateConnection(domain string, location 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.(*ProxyOption).DialFunc
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if fn != nil {
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return fn()
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}
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}
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return nil, ErrNoDomain
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}
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func (rp *HttpReverseProxy) getVhost(domain string, location string) (vr *VhostRouter, ok bool) {
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rp.cfgMu.RLock()
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defer rp.cfgMu.RUnlock()
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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 vr, 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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return
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}
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func (rp *HttpReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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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(p))
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return len(p), nil
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}
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