if no A, return nil
(domain string)
| 71 | |
| 72 | // if no A, return nil |
| 73 | func (c *DNSClient) A(domain string) (net.IP, error) { |
| 74 | m := &dns.Msg{} |
| 75 | m.SetQuestion(domain+".", dns.TypeA) |
| 76 | m, err := c.Exchange(m) |
| 77 | if err != nil { |
| 78 | return nil, err |
| 79 | } |
| 80 | for _, v := range m.Answer { |
| 81 | if t, ok := v.(*dns.A); ok { |
| 82 | return t.A, nil |
| 83 | } |
| 84 | } |
| 85 | return nil, nil |
| 86 | } |