mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 13:05:46 +00:00
117 lines
2.7 KiB
Go
117 lines
2.7 KiB
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// The hello binary runs hello.ipn.dev.
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package main // import "tailscale.com/cmd/hello"
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import (
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"encoding/json"
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"flag"
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"fmt"
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"html/template"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"net/url"
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"strings"
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"tailscale.com/tailcfg"
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)
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var (
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httpAddr = flag.String("http", ":80", "address to run an HTTP server on, or empty for none")
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httpsAddr = flag.String("https", ":443", "address to run an HTTPS server on, or empty for none")
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)
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func main() {
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flag.Parse()
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http.HandleFunc("/", root)
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log.Printf("Starting hello server.")
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errc := make(chan error, 1)
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if *httpAddr != "" {
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log.Printf("running HTTP server on %s", *httpAddr)
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go func() {
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errc <- http.ListenAndServe(*httpAddr, nil)
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}()
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}
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if *httpsAddr != "" {
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log.Printf("running HTTPS server on %s", *httpsAddr)
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go func() {
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errc <- http.ListenAndServeTLS(*httpsAddr,
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"/etc/hello/hello.ipn.dev.crt",
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"/etc/hello/hello.ipn.dev.key",
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nil,
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)
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}()
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}
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log.Fatal(<-errc)
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}
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func slurpHTML() string {
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slurp, err := ioutil.ReadFile("hello.tmpl.html")
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if err != nil {
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log.Fatal(err)
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}
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return string(slurp)
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}
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var tmpl = template.Must(template.New("home").Parse(slurpHTML()))
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type tmplData struct {
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DisplayName string // "Foo Barberson"
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LoginName string // "foo@bar.com"
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MachineName string // "imac5k"
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IP string // "100.2.3.4"
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}
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func root(w http.ResponseWriter, r *http.Request) {
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if r.TLS == nil && *httpsAddr != "" {
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host := r.Host
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if strings.Contains(r.Host, "100.101.102.103") {
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host = "hello.ipn.dev"
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}
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http.Redirect(w, r, "https://"+host, http.StatusFound)
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return
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}
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if r.RequestURI != "/" {
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http.Redirect(w, r, "/", http.StatusFound)
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return
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}
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ip, _, err := net.SplitHostPort(r.RemoteAddr)
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if err != nil {
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http.Error(w, "no remote addr", 500)
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return
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}
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who, err := whoIs(ip)
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if err != nil {
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log.Printf("whois(%q) error: %v", ip, err)
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http.Error(w, "Your Tailscale works, but we failed to look you up.", 500)
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return
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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tmpl.Execute(w, tmplData{
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DisplayName: who.UserProfile.DisplayName,
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LoginName: who.UserProfile.LoginName,
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MachineName: who.Node.ComputedName,
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IP: ip,
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})
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}
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func whoIs(ip string) (*tailcfg.WhoIsResponse, error) {
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res, err := http.Get("http://127.0.0.1:4242/whois?ip=" + url.QueryEscape(ip))
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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if res.StatusCode != 200 {
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slurp, _ := ioutil.ReadAll(res.Body)
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return nil, fmt.Errorf("HTTP %s: %s", res.Status, slurp)
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}
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r := new(tailcfg.WhoIsResponse)
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return r, json.NewDecoder(res.Body).Decode(r)
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}
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