frp/utils/vhost/newhttp.go

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2017-12-13 03:27:43 +08:00
// Copyright 2017 fatedier, fatedier@gmail.com
//
// 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 vhost
import (
"context"
"errors"
"log"
"net"
"net/http"
"strings"
"sync"
"time"
frpLog "github.com/fatedier/frp/utils/log"
frpNet "github.com/fatedier/frp/utils/net"
"github.com/fatedier/frp/utils/pool"
)
var (
responseHeaderTimeout = time.Duration(30) * time.Second
ErrRouterConfigConflict = errors.New("router config conflict")
ErrNoDomain = errors.New("no such domain")
)
func getHostFromAddr(addr string) (host string) {
strs := strings.Split(addr, ":")
if len(strs) > 1 {
host = strs[0]
} else {
host = addr
}
return
}
type CreateConnFunc func() (frpNet.Conn, error)
type ProxyOption struct {
RewriteHost string
DialFunc CreateConnFunc
}
type HttpReverseProxy struct {
proxy *ReverseProxy
tr *http.Transport
vhostRouter *VhostRouters
cfgMu sync.RWMutex
}
func NewHttpReverseProxy() *HttpReverseProxy {
rp := &HttpReverseProxy{
vhostRouter: NewVhostRouters(),
}
proxy := &ReverseProxy{
Director: func(req *http.Request) {
req.URL.Scheme = "http"
url := req.Context().Value("url").(string)
host := getHostFromAddr(req.Context().Value("host").(string))
host = rp.GetRealHost(host, url)
if host != "" {
req.Host = host
req.URL.Host = req.Host
}
},
Transport: &http.Transport{
ResponseHeaderTimeout: responseHeaderTimeout,
DisableKeepAlives: true,
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
url := ctx.Value("url").(string)
host := getHostFromAddr(ctx.Value("host").(string))
return rp.CreateConnection(host, url)
},
},
BufferPool: newWrapPool(),
ErrorLog: log.New(newWrapLogger(), "", 0),
}
rp.proxy = proxy
return rp
}
func (rp *HttpReverseProxy) Register(domain string, location string, rewriteHost string, fn CreateConnFunc) error {
rp.cfgMu.Lock()
defer rp.cfgMu.Unlock()
_, ok := rp.vhostRouter.Exist(domain, location)
if ok {
return ErrRouterConfigConflict
} else {
payload := &ProxyOption{
RewriteHost: rewriteHost,
DialFunc: fn,
}
rp.vhostRouter.Add(domain, location, payload)
}
return nil
}
func (rp *HttpReverseProxy) UnRegister(domain string, location string) {
rp.cfgMu.Lock()
defer rp.cfgMu.Unlock()
rp.vhostRouter.Del(domain, location)
}
func (rp *HttpReverseProxy) GetRealHost(domain string, location string) (host string) {
vr, ok := rp.getVhost(domain, location)
if ok {
host = vr.payload.(*ProxyOption).RewriteHost
}
return
}
func (rp *HttpReverseProxy) CreateConnection(domain string, location string) (net.Conn, error) {
vr, ok := rp.getVhost(domain, location)
if ok {
fn := vr.payload.(*ProxyOption).DialFunc
if fn != nil {
return fn()
}
}
return nil, ErrNoDomain
}
func (rp *HttpReverseProxy) getVhost(domain string, location string) (vr *VhostRouter, ok bool) {
rp.cfgMu.RLock()
defer rp.cfgMu.RUnlock()
// first we check the full hostname
// if not exist, then check the wildcard_domain such as *.example.com
vr, ok = rp.vhostRouter.Get(domain, location)
if ok {
return
}
domainSplit := strings.Split(domain, ".")
if len(domainSplit) < 3 {
return vr, false
}
domainSplit[0] = "*"
domain = strings.Join(domainSplit, ".")
vr, ok = rp.vhostRouter.Get(domain, location)
return
}
func (rp *HttpReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
rp.proxy.ServeHTTP(rw, req)
}
type wrapPool struct{}
func newWrapPool() *wrapPool { return &wrapPool{} }
func (p *wrapPool) Get() []byte { return pool.GetBuf(32 * 1024) }
func (p *wrapPool) Put(buf []byte) { pool.PutBuf(buf) }
type wrapLogger struct{}
func newWrapLogger() *wrapLogger { return &wrapLogger{} }
func (l *wrapLogger) Write(p []byte) (n int, err error) {
frpLog.Warn("%s", string(p))
return len(p), nil
}