60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
package main
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import (
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"encoding/binary"
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"errors"
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"flag"
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"io/ioutil"
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"log"
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"os"
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"strings"
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check "antoine-roux.ml/projects/go/dns-tools/internal"
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"github.com/miekg/dns"
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)
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func main() {
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file := flag.String("f", "", "file path to read hexa decimal wireformat data")
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domainToResolve := flag.String("s", "-", "Server adress to resolve")
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flag.Parse()
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// remove timestamp prefix from log out
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log.SetFlags(0)
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if *file != "" {
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if *file == "-" {
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*file = os.Stdin.Name()
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}
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body, err := ioutil.ReadFile(*file)
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check.Check(err)
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msg := &dns.Msg{}
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err = msg.Unpack(body)
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check.Check(err)
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log.Println(msg)
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} else if *domainToResolve != "" {
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if *domainToResolve == "-" {
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readDomainToResolve, err := ioutil.ReadFile(os.Stdin.Name())
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check.Check(err)
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*domainToResolve = strings.TrimSuffix(string(readDomainToResolve), "\n")
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}
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msg := &dns.Msg{
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Question: []dns.Question{
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dns.Question{
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dns.Fqdn(*domainToResolve),
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dns.TypeA,
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dns.ClassINET,
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},
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},
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}
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b, err := msg.Pack()
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check.Check(err)
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binary.Write(os.Stdout, binary.LittleEndian, b)
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} else {
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log.Println(errors.New("Too few argument pass"))
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flag.Usage()
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}
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}
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