tools.go_host: host.go annotate

awgur@0	1 package main
awgur@0	2
awgur@0	3 import (
awgur@0	4 "fmt"
awgur@0	5 "net"
awgur@0	6 "os"
awgur@0	7
awgur@0	8 idna "golang.org/x/net/idna"
awgur@0	9 )
awgur@0	10
awgur@0	11 func say_err(msg interface{}) {
awgur@0	12 _, err := fmt.Fprintf(os.Stderr, "ERROR: %s\n", msg)
awgur@0	13 if err != nil {
awgur@0	14 panic(err)
awgur@0	15 }
awgur@0	16
awgur@0	17 os.Exit(1)
awgur@0	18 }
awgur@0	19
awgur@0	20 func main() {
awgur@0	21 if len(os.Args) < 2 {
awgur@0	22 say_err("Need hostname or IP as argument")
awgur@0	23 }
awgur@0	24
awgur@0	25 arg := os.Args[1]
awgur@0	26
awgur@0	27 ip := net.ParseIP(arg)
awgur@0	28
awgur@0	29 if ip != nil {
awgur@0	30 res, err := net.LookupAddr(ip.String())
awgur@0	31 if err != nil {
awgur@0	32 say_err(err)
awgur@0	33 }
awgur@0	34
awgur@0	35 for _, i := range res {
awgur@0	36 fmt.Println(i)
awgur@0	37 }
awgur@0	38
awgur@0	39 } else {
awgur@0	40 hostname, err := idna.ToASCII(arg)
awgur@0	41 if err != nil {
awgur@0	42 say_err(err)
awgur@0	43 }
awgur@0	44
awgur@0	45 res, err := net.LookupHost(hostname)
awgur@0	46 if err != nil {
awgur@0	47 say_err(err)
awgur@0	48 }
awgur@0	49
awgur@0	50 for _, i := range res {
awgur@0	51 fmt.Println(i)
awgur@0	52 }
awgur@0	53
awgur@0	54 }
awgur@0	55
awgur@0	56 }

tools.go_host