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51 lines
1006 B
Go
51 lines
1006 B
Go
package brook
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import (
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"errors"
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"net"
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"github.com/miekg/dns"
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)
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func Resolve6(host string) (string, error) {
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if net.ParseIP(host).To4() != nil {
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return "", errors.New("This is ipv4")
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}
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if net.ParseIP(host).To16() != nil {
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return host, nil
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}
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m := &dns.Msg{}
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m.SetQuestion(host+".", dns.TypeAAAA)
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r, err := dns.Exchange(m, "[2001:4860:4860::8888]:53")
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if err != nil {
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return "", err
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}
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for _, v := range r.Answer {
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if t, ok := v.(*dns.AAAA); ok {
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return t.AAAA.String(), nil
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}
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}
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return "", errors.New("Can not find IP")
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}
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func Resolve4(host string) (string, error) {
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if net.ParseIP(host).To4() != nil {
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return host, nil
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}
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if net.ParseIP(host).To16() != nil {
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return "", errors.New("This is ipv6")
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}
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m := &dns.Msg{}
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m.SetQuestion(host+".", dns.TypeA)
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r, err := dns.Exchange(m, "8.8.8.8:53")
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if err != nil {
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return "", err
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}
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for _, v := range r.Answer {
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if t, ok := v.(*dns.A); ok {
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return t.A.String(), nil
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}
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}
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return "", errors.New("Can not find IP")
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}
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