all: modify import path, change version to v0.8.0

src/utils/vhost/vhost.go

@@ -0,0 +1,191 @@
+// 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"
+)
+
+type muxFunc func(*conn.Conn) (net.Conn, string, error)
+type hostRewriteFunc func(*conn.Conn, string) (net.Conn, error)
+
+type VhostMuxer struct {
+	listener    *conn.Listener
+	timeout     time.Duration
+	vhostFunc   muxFunc
+	rewriteFunc hostRewriteFunc
+	registryMap map[string]*Listener
+	mutex       sync.RWMutex
+}
+
+func NewVhostMuxer(listener *conn.Listener, vhostFunc muxFunc, rewriteFunc hostRewriteFunc, timeout time.Duration) (mux *VhostMuxer, err error) {
+	mux = &VhostMuxer{
+		listener:    listener,
+		timeout:     timeout,
+		vhostFunc:   vhostFunc,
+		rewriteFunc: rewriteFunc,
+		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) {
+	v.mutex.Lock()
+	defer v.mutex.Unlock()
+	if _, exist := v.registryMap[name]; exist {
+		return nil, fmt.Errorf("domain name %s is already bound", name)
+	}
+
+	l = &Listener{
+		name:        name,
+		rewriteHost: rewriteHost,
+		mux:         v,
+		accept:      make(chan *conn.Conn),
+	}
+	v.registryMap[name] = l
+	return l, nil
+}
+
+func (v *VhostMuxer) getListener(name string) (l *Listener, exist bool) {
+	v.mutex.RLock()
+	defer v.mutex.RUnlock()
+	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 {
+		return
+	}
+
+	sConn, name, err := v.vhostFunc(c)
+	if err != nil {
+		return
+	}
+
+	name = strings.ToLower(name)
+	l, ok := v.getListener(name)
+	if !ok {
+		return
+	}
+
+	if err = sConn.SetDeadline(time.Time{}); err != nil {
+		return
+	}
+	c.SetTcpConn(sConn)
+
+	l.accept <- c
+}
+
+type Listener struct {
+	name        string
+	rewriteHost string
+	mux         *VhostMuxer // for closing VhostMuxer
+	accept      chan *conn.Conn
+}
+
+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)
+	}
+	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
+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
+}