83 lines
1.5 KiB
Go
83 lines
1.5 KiB
Go
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package main
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"os"
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"strings"
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)
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var (
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serverMode bool
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addr string
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port string
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envP string
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host string
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envHost string
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)
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func init() {
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envP = os.Getenv("MYIP_PORT")
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envHost = os.Getenv("MYIP_HOST")
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flag.BoolVar(&serverMode, "s", false, "run in server mode")
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flag.StringVar(&host, "u", "kumoly.io", "hostname to ask for")
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flag.StringVar(&port, "p", "5080", "port to listen|connect")
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flag.StringVar(&addr, "b", "0.0.0.0", "the address the server binds on")
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}
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func usage() {
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fmt.Fprintf(os.Stderr, "Usage: myip [options]\n")
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flag.PrintDefaults()
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}
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func main() {
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flag.Parse()
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if envP != "" {
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port = envP
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}
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if envHost != "" {
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host = envHost
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}
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if serverMode {
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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ip := r.Header.Get("X-Real-Ip")
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if ip == "" {
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ip = r.Header.Get("X-Forwarded-For")
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}
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if ip == "" {
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var err error
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ip, _, err = net.SplitHostPort(r.RemoteAddr)
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if err != nil {
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ip = r.RemoteAddr
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}
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}
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fmt.Fprint(w, ip+"\n")
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})
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err := http.ListenAndServe(addr+":"+port, nil)
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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} else {
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res, err := http.Get("http://" + host + ":" + port)
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if err != nil {
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fmt.Println(err)
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os.Exit(2)
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}
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body, err := ioutil.ReadAll(res.Body)
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res.Body.Close()
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if err != nil {
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fmt.Println(err)
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os.Exit(3)
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}
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fmt.Println(strings.TrimRight(string(body), "\r\n"))
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}
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}
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