frp/src/utils/vhost/http.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 (
"bufio"
"bytes"
"fmt"
"io"
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"net"
"net/http"
"net/url"
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"strings"
"time"
"github.com/fatedier/frp/src/utils/conn"
"github.com/fatedier/frp/src/utils/pool"
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)
type HttpMuxer struct {
*VhostMuxer
}
func GetHttpHostname(c *conn.Conn) (_ net.Conn, routerName string, err error) {
sc, rd := newShareConn(c.TcpConn)
request, err := http.ReadRequest(bufio.NewReader(rd))
if err != nil {
return sc, "", err
}
tmpArr := strings.Split(request.Host, ":")
routerName = tmpArr[0]
request.Body.Close()
return sc, routerName, nil
}
func NewHttpMuxer(listener *conn.Listener, timeout time.Duration) (*HttpMuxer, error) {
mux, err := NewVhostMuxer(listener, GetHttpHostname, HttpHostNameRewrite, timeout)
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return &HttpMuxer{mux}, err
}
func HttpHostNameRewrite(c *conn.Conn, rewriteHost string) (_ net.Conn, err error) {
sc, rd := newShareConn(c.TcpConn)
var buff []byte
if buff, err = hostNameRewrite(rd, rewriteHost); err != nil {
return sc, err
}
err = sc.WriteBuff(buff)
return sc, err
}
func hostNameRewrite(request io.Reader, rewriteHost string) (_ []byte, err error) {
buf := pool.GetBuf(1024)
defer pool.PutBuf(buf)
request.Read(buf)
retBuffer, err := parseRequest(buf, rewriteHost)
return retBuffer, err
}
func parseRequest(org []byte, rewriteHost string) (ret []byte, err error) {
tp := bytes.NewBuffer(org)
// First line: GET /index.html HTTP/1.0
var b []byte
if b, err = tp.ReadBytes('\n'); err != nil {
return nil, err
}
req := new(http.Request)
// we invoked ReadRequest in GetHttpHostname before, so we ignore error
req.Method, req.RequestURI, req.Proto, _ = parseRequestLine(string(b))
rawurl := req.RequestURI
// CONNECT www.google.com:443 HTTP/1.1
justAuthority := req.Method == "CONNECT" && !strings.HasPrefix(rawurl, "/")
if justAuthority {
rawurl = "http://" + rawurl
}
req.URL, _ = url.ParseRequestURI(rawurl)
if justAuthority {
// Strip the bogus "http://" back off.
req.URL.Scheme = ""
}
// RFC2616: first case
// GET /index.html HTTP/1.1
// Host: www.google.com
if req.URL.Host == "" {
changedBuf, err := changeHostName(tp, rewriteHost)
buf := new(bytes.Buffer)
buf.Write(b)
buf.Write(changedBuf)
return buf.Bytes(), err
}
// RFC2616: second case
// GET http://www.google.com/index.html HTTP/1.1
// Host: doesntmatter
// In this case, any Host line is ignored.
hostPort := strings.Split(req.URL.Host, ":")
if len(hostPort) == 1 {
req.URL.Host = rewriteHost
} else if len(hostPort) == 2 {
req.URL.Host = fmt.Sprintf("%s:%s", rewriteHost, hostPort[1])
}
firstLine := req.Method + " " + req.URL.String() + " " + req.Proto
buf := new(bytes.Buffer)
buf.WriteString(firstLine)
tp.WriteTo(buf)
return buf.Bytes(), err
}
// parseRequestLine parses "GET /foo HTTP/1.1" into its three parts.
func parseRequestLine(line string) (method, requestURI, proto string, ok bool) {
s1 := strings.Index(line, " ")
s2 := strings.Index(line[s1+1:], " ")
if s1 < 0 || s2 < 0 {
return
}
s2 += s1 + 1
return line[:s1], line[s1+1 : s2], line[s2+1:], true
}
func changeHostName(buff *bytes.Buffer, rewriteHost string) (_ []byte, err error) {
retBuf := new(bytes.Buffer)
peek := buff.Bytes()
for len(peek) > 0 {
i := bytes.IndexByte(peek, '\n')
if i < 3 {
// Not present (-1) or found within the next few bytes,
// implying we're at the end ("\r\n\r\n" or "\n\n")
return nil, err
}
kv := peek[:i]
j := bytes.IndexByte(kv, ':')
if j < 0 {
return nil, fmt.Errorf("malformed MIME header line: " + string(kv))
}
if strings.Contains(strings.ToLower(string(kv[:j])), "host") {
var hostHeader string
portPos := bytes.IndexByte(kv[j+1:], ':')
if portPos == -1 {
hostHeader = fmt.Sprintf("Host: %s\n", rewriteHost)
} else {
hostHeader = fmt.Sprintf("Host: %s:%s\n", rewriteHost, kv[portPos+1:])
}
retBuf.WriteString(hostHeader)
peek = peek[i+1:]
break
} else {
retBuf.Write(peek[:i])
retBuf.WriteByte('\n')
}
peek = peek[i+1:]
}
retBuf.Write(peek)
return retBuf.Bytes(), err
}