48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
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package main
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import (
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"errors"
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"fmt"
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"net"
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"time"
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"github.com/miekg/dns"
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)
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type DnsTest struct {
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server net.IP
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testHost string
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rtt time.Duration
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answer net.IP
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}
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func RunTest(srv net.IP, host string) (*DnsTest, error) {
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m := new(dns.Msg)
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m.SetQuestion(host, dns.TypeA)
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c := new(dns.Client)
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in, rtt, err := c.Exchange(m, fmt.Sprintf("%s:53", srv))
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if err != nil {
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return nil, err
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}
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for _, answer := range in.Answer {
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if t, ok := answer.(*dns.A); ok {
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return &DnsTest{server: srv, testHost: host, rtt: rtt, answer: t.A}, nil
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}
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}
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return nil, errors.New("No answer found")
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}
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func main() {
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testHosts := []string{ "gitea.snamellit.com", "www.snamellit.com", "home.snamellit.com", "nas.snamellit.com" , "gitlab.melexis.com", "dsl.melexis.com", "cvs.tess.elex.be", "cvs.sofia.elex.be", "cvs.sensors.elex.be", "cvs.erfurt.elex.be", "www.google.com" }
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for _, host := range testHosts {
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t, err := RunTest(net.ParseIP("192.168.1.1"), host + ".")
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if err != nil {
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fmt.Println("Error for ", host, ":", err.Error())
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continue
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}
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fmt.Println("Answer ", t.server, t.testHost, t.answer, t.rtt)
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}
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}
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