frp/src/utils/vhost/vhost.go

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// Copyright 2016 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 (
"bytes"
"fmt"
"io"
"net"
"strings"
"sync"
"time"
"github.com/fatedier/frp/src/utils/conn"
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)
type muxFunc func(*conn.Conn) (net.Conn, string, error)
type hostRewriteFunc func(*conn.Conn, string) (net.Conn, error)
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type VhostMuxer struct {
listener *conn.Listener
timeout time.Duration
vhostFunc muxFunc
rewriteFunc hostRewriteFunc
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registryMap map[string]*Listener
mutex sync.RWMutex
}
func NewVhostMuxer(listener *conn.Listener, vhostFunc muxFunc, rewriteFunc hostRewriteFunc, timeout time.Duration) (mux *VhostMuxer, err error) {
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mux = &VhostMuxer{
listener: listener,
timeout: timeout,
vhostFunc: vhostFunc,
rewriteFunc: rewriteFunc,
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registryMap: make(map[string]*Listener),
}
go mux.run()
return mux, nil
}
// listen for a new domain name, if rewriteHost is not empty and rewriteFunc is not nil, then rewrite the host header to rewriteHost
func (v *VhostMuxer) Listen(name string, rewriteHost string) (l *Listener, err error) {
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v.mutex.Lock()
defer v.mutex.Unlock()
if _, exist := v.registryMap[name]; exist {
return nil, fmt.Errorf("domain name %s is already bound", name)
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}
l = &Listener{
name: name,
rewriteHost: rewriteHost,
mux: v,
accept: make(chan *conn.Conn),
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}
v.registryMap[name] = l
return l, nil
}
func (v *VhostMuxer) getListener(name string) (l *Listener, exist bool) {
v.mutex.RLock()
defer v.mutex.RUnlock()
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// first we check the full hostname
// if not exist, then check the wildcard_domain such as *.example.com
l, exist = v.registryMap[name]
if exist {
return l, exist
}
domainSplit := strings.Split(name, ".")
if len(domainSplit) < 3 {
return l, false
}
domainSplit[0] = "*"
name = strings.Join(domainSplit, ".")
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l, exist = v.registryMap[name]
return l, exist
}
func (v *VhostMuxer) unRegister(name string) {
v.mutex.Lock()
defer v.mutex.Unlock()
delete(v.registryMap, name)
}
func (v *VhostMuxer) run() {
for {
conn, err := v.listener.Accept()
if err != nil {
return
}
go v.handle(conn)
}
}
func (v *VhostMuxer) handle(c *conn.Conn) {
if err := c.SetDeadline(time.Now().Add(v.timeout)); err != nil {
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c.Close()
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return
}
sConn, name, err := v.vhostFunc(c)
if err != nil {
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c.Close()
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return
}
name = strings.ToLower(name)
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// get listener by hostname
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l, ok := v.getListener(name)
if !ok {
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c.Close()
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return
}
if err = sConn.SetDeadline(time.Time{}); err != nil {
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c.Close()
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return
}
c.SetTcpConn(sConn)
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l.accept <- c
}
type Listener struct {
name string
rewriteHost string
mux *VhostMuxer // for closing VhostMuxer
accept chan *conn.Conn
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}
func (l *Listener) Accept() (*conn.Conn, error) {
conn, ok := <-l.accept
if !ok {
return nil, fmt.Errorf("Listener closed")
}
// if rewriteFunc is exist and rewriteHost is set
// rewrite http requests with a modified host header
if l.mux.rewriteFunc != nil && l.rewriteHost != "" {
sConn, err := l.mux.rewriteFunc(conn, l.rewriteHost)
if err != nil {
return nil, fmt.Errorf("http host header rewrite failed")
}
conn.SetTcpConn(sConn)
}
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return conn, nil
}
func (l *Listener) Close() error {
l.mux.unRegister(l.name)
close(l.accept)
return nil
}
func (l *Listener) Name() string {
return l.name
}
type sharedConn struct {
net.Conn
sync.Mutex
buff *bytes.Buffer
}
// the bytes you read in io.Reader, will be reserved in sharedConn
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func newShareConn(conn net.Conn) (*sharedConn, io.Reader) {
sc := &sharedConn{
Conn: conn,
buff: bytes.NewBuffer(make([]byte, 0, 1024)),
}
return sc, io.TeeReader(conn, sc.buff)
}
func (sc *sharedConn) Read(p []byte) (n int, err error) {
sc.Lock()
if sc.buff == nil {
sc.Unlock()
return sc.Conn.Read(p)
}
n, err = sc.buff.Read(p)
if err == io.EOF {
sc.buff = nil
var n2 int
n2, err = sc.Conn.Read(p[n:])
n += n2
}
sc.Unlock()
return
}
func (sc *sharedConn) WriteBuff(buffer []byte) (err error) {
sc.buff.Reset()
_, err = sc.buff.Write(buffer)
return err
}