123 lines
3.2 KiB
Go
123 lines
3.2 KiB
Go
|
/*
|
||
|
|
Copyright 2015 The Kubernetes Authors.
|
||
|
|
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
// A tiny web server for viewing the environment kubernetes creates for your
|
||
|
|
// containers. It exposes the filesystem and environment variables via http
|
||
|
|
// server.
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"flag"
|
||
|
|
"fmt"
|
||
|
|
"log"
|
||
|
|
"net"
|
||
|
|
"net/http"
|
||
|
|
"os"
|
||
|
|
|
||
|
|
"github.com/davecgh/go-spew/spew"
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
port = flag.Int("port", 8080, "Port number to serve at.")
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
flag.Parse()
|
||
|
|
hostname, err := os.Hostname()
|
||
|
|
if err != nil {
|
||
|
|
log.Fatalf("Error getting hostname: %v", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
links := []struct {
|
||
|
|
link, desc string
|
||
|
|
}{
|
||
|
|
{"/fs/", "Complete file system as seen by this container."},
|
||
|
|
{"/vars/", "Environment variables as seen by this container."},
|
||
|
|
{"/hostname/", "Hostname as seen by this container."},
|
||
|
|
{"/dns?q=google.com", "Explore DNS records seen by this container."},
|
||
|
|
{"/quit", "Cause this container to exit."},
|
||
|
|
}
|
||
|
|
|
||
|
|
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
|
||
|
|
fmt.Fprintf(w, "<b> Kubernetes environment explorer </b><br/><br/>")
|
||
|
|
for _, v := range links {
|
||
|
|
fmt.Fprintf(w, `<a href="%v">%v: %v</a><br/>`, v.link, v.link, v.desc)
|
||
|
|
}
|
||
|
|
})
|
||
|
|
|
||
|
|
http.Handle("/fs/", http.StripPrefix("/fs/", http.FileServer(http.Dir("/"))))
|
||
|
|
http.HandleFunc("/vars/", func(w http.ResponseWriter, r *http.Request) {
|
||
|
|
for _, v := range os.Environ() {
|
||
|
|
fmt.Fprintf(w, "%v\n", v)
|
||
|
|
}
|
||
|
|
})
|
||
|
|
http.HandleFunc("/hostname/", func(w http.ResponseWriter, r *http.Request) {
|
||
|
|
fmt.Fprintf(w, hostname)
|
||
|
|
})
|
||
|
|
http.HandleFunc("/quit", func(w http.ResponseWriter, r *http.Request) {
|
||
|
|
os.Exit(0)
|
||
|
|
})
|
||
|
|
http.HandleFunc("/dns", dns)
|
||
|
|
|
||
|
|
go log.Fatal(http.ListenAndServe(fmt.Sprintf("0.0.0.0:%d", *port), nil))
|
||
|
|
|
||
|
|
select {}
|
||
|
|
}
|
||
|
|
|
||
|
|
func dns(w http.ResponseWriter, r *http.Request) {
|
||
|
|
q := r.URL.Query().Get("q")
|
||
|
|
// Note that the below is NOT safe from input attacks, but that's OK
|
||
|
|
// because this is just for debugging.
|
||
|
|
fmt.Fprintf(w, `<html><body>
|
||
|
|
<form action="/dns">
|
||
|
|
<input name="q" type="text" value="%v"></input>
|
||
|
|
<button type="submit">Lookup</button>
|
||
|
|
</form>
|
||
|
|
<br/><br/><pre>`, q)
|
||
|
|
{
|
||
|
|
res, err := net.LookupNS(q)
|
||
|
|
spew.Fprintf(w, "LookupNS(%v):\nResult: %#v\nError: %v\n\n", q, res, err)
|
||
|
|
}
|
||
|
|
{
|
||
|
|
res, err := net.LookupTXT(q)
|
||
|
|
spew.Fprintf(w, "LookupTXT(%v):\nResult: %#v\nError: %v\n\n", q, res, err)
|
||
|
|
}
|
||
|
|
{
|
||
|
|
cname, res, err := net.LookupSRV("", "", q)
|
||
|
|
spew.Fprintf(w, `LookupSRV("", "", %v):
|
||
|
|
cname: %v
|
||
|
|
Result: %#v
|
||
|
|
Error: %v
|
||
|
|
|
||
|
|
`, q, cname, res, err)
|
||
|
|
}
|
||
|
|
{
|
||
|
|
res, err := net.LookupHost(q)
|
||
|
|
spew.Fprintf(w, "LookupHost(%v):\nResult: %#v\nError: %v\n\n", q, res, err)
|
||
|
|
}
|
||
|
|
{
|
||
|
|
res, err := net.LookupIP(q)
|
||
|
|
spew.Fprintf(w, "LookupIP(%v):\nResult: %#v\nError: %v\n\n", q, res, err)
|
||
|
|
}
|
||
|
|
{
|
||
|
|
res, err := net.LookupMX(q)
|
||
|
|
spew.Fprintf(w, "LookupMX(%v):\nResult: %#v\nError: %v\n\n", q, res, err)
|
||
|
|
}
|
||
|
|
fmt.Fprintf(w, `</pre>
|
||
|
|
</body>
|
||
|
|
</html>`)
|
||
|
|
}
|