November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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14.4. Wykonywanie zapytań DNS
Problem
Chcemy znaleźć adres IP odpowiadający nazwie domeny lub dowiedzieć się, czy w określonej domenie jest dostępna wybrana usługa (na przykład serwer e-mail).
Rozwiązanie
Wyszukiwanie DNS można przeprowadzić za pomocą klasy Resolv::DNS ze standardowej biblioteki resolv. Najczęściej wykorzystywaną metodą jest DNS#each_address. Jej działanie polega na przetwarzaniu w pętli adresów IP przypisanych do nazwy domeny.
require 'resolv'
Resolv::DNS.new.each_address("oreilly.com") { |addr| puts addr }
# 208.201.239.36
# 208.201.239.37
Dyskusja
Aby sprawdzić istnienie określonego typu rekordu DNS (na przykład rekordu MX w przypadku serwera pocztowego), można skorzystać z metody DNS#getresources lub z iteratora ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.