mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
126 lines
3.4 KiB
Go
126 lines
3.4 KiB
Go
// Copyright 2017 Google Inc.
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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 tcpproxy
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import (
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"bufio"
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"bytes"
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"context"
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"net/http"
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)
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// AddHTTPHostRoute appends a route to the ipPort listener that
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// routes to dest if the incoming HTTP/1.x Host header name is
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// httpHost. If it doesn't match, rule processing continues for any
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// additional routes on ipPort.
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//
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// The ipPort is any valid net.Listen TCP address.
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func (p *Proxy) AddHTTPHostRoute(ipPort, httpHost string, dest Target) {
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p.AddHTTPHostMatchRoute(ipPort, equals(httpHost), dest)
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}
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// AddHTTPHostMatchRoute appends a route to the ipPort listener that
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// routes to dest if the incoming HTTP/1.x Host header name is
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// accepted by matcher. If it doesn't match, rule processing continues
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// for any additional routes on ipPort.
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//
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// The ipPort is any valid net.Listen TCP address.
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func (p *Proxy) AddHTTPHostMatchRoute(ipPort string, match Matcher, dest Target) {
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p.addRoute(ipPort, httpHostMatch{match, dest})
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}
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type httpHostMatch struct {
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matcher Matcher
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target Target
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}
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func (m httpHostMatch) match(br *bufio.Reader) (Target, string) {
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hh := httpHostHeader(br)
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if m.matcher(context.TODO(), hh) {
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return m.target, hh
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}
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return nil, ""
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}
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// httpHostHeader returns the HTTP Host header from br without
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// consuming any of its bytes. It returns "" if it can't find one.
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func httpHostHeader(br *bufio.Reader) string {
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const maxPeek = 4 << 10
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peekSize := 0
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for {
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peekSize++
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if peekSize > maxPeek {
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b, _ := br.Peek(br.Buffered())
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return httpHostHeaderFromBytes(b)
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}
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b, err := br.Peek(peekSize)
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if n := br.Buffered(); n > peekSize {
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b, _ = br.Peek(n)
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peekSize = n
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}
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if len(b) > 0 {
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if b[0] < 'A' || b[0] > 'Z' {
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// Doesn't look like an HTTP verb
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// (GET, POST, etc).
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return ""
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}
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if bytes.Index(b, crlfcrlf) != -1 || bytes.Index(b, lflf) != -1 {
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req, err := http.ReadRequest(bufio.NewReader(bytes.NewReader(b)))
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if err != nil {
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return ""
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}
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if len(req.Header["Host"]) > 1 {
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// TODO(bradfitz): what does
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// ReadRequest do if there are
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// multiple Host headers?
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return ""
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}
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return req.Host
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}
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}
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if err != nil {
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return httpHostHeaderFromBytes(b)
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}
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}
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}
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var (
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lfHostColon = []byte("\nHost:")
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lfhostColon = []byte("\nhost:")
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crlf = []byte("\r\n")
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lf = []byte("\n")
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crlfcrlf = []byte("\r\n\r\n")
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lflf = []byte("\n\n")
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)
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func httpHostHeaderFromBytes(b []byte) string {
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if i := bytes.Index(b, lfHostColon); i != -1 {
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return string(bytes.TrimSpace(untilEOL(b[i+len(lfHostColon):])))
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}
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if i := bytes.Index(b, lfhostColon); i != -1 {
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return string(bytes.TrimSpace(untilEOL(b[i+len(lfhostColon):])))
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}
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return ""
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}
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// untilEOL returns v, truncated before the first '\n' byte, if any.
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// The returned slice may include a '\r' at the end.
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func untilEOL(v []byte) []byte {
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if i := bytes.IndexByte(v, '\n'); i != -1 {
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return v[:i]
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}
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return v
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}
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