55 lines
918 B
Go
55 lines
918 B
Go
package main
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import (
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"dns"
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"time"
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"fmt"
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)
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const (
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NLOOP = 5
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)
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func identity(msg []byte) []byte {
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return msg
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}
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func byteflip(msg []byte) []byte {
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msg[len(msg) - 1] = 0
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msg[2] = 0 // See what happens
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return msg
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}
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func bitflip(msg []byte) []byte {
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return msg
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}
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func main() {
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res := new(dns.Resolver)
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ch := dns.NewQuerier(res)
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// configure the resolver
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res.Servers = []string{"192.168.1.2"}
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res.Timeout = 2
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res.Attempts = 1
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res.Mangle = byteflip
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// Setup done, now for some real work
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// Create a new message
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m := new(dns.Msg)
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m.MsgHdr.Recursion_desired = true //only set this bit
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m.Question = make([]dns.Question, 1)
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// ask something
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m.Question[0] = dns.Question{"miek.nl", dns.TypeSOA, dns.ClassINET}
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ch <- dns.DnsMsg{m, nil}
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// wait for an reply
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in := <-ch
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fmt.Printf("%v\n", in.Dns)
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ch <- dns.DnsMsg{nil, nil}
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time.Sleep(1.0e9) // wait for Go routine to do something
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}
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