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check_nameservers's Issues

SOA sync checker does not check all name servers

In the current design, the SOA checker does not query all available name servers. Consider "example.com":

$ dig +short NS example.com
b.iana-servers.net.
a.iana-servers.net.
$ dig +short A a.iana-servers.net.
199.43.132.53
$ dig +short AAAA a.iana-servers.net.
2001:500:8c::53

check_nameservers_are_in_sync_for_zone.py will only run a test asking "dig +short SOA example.com @a.iana-servers.net", and the dig tool decides to use one of the available addresses of the 'a' nameserver. Each symbolic name could even resolve to multiple A or AAAA records.

We could either iterate over these names or convert the tool to the +nssearch mode of dig:

$ dig +nssearch example.com          
SOA sns.dns.icann.org. noc.dns.icann.org. 2014091653 7200 3600 1209600 3600 from server 199.43.132.53 in 245 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2014091653 7200 3600 1209600 3600 from server 2001:500:8c::53 in 246 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2014091653 7200 3600 1209600 3600 from server 2001:500:8d::53 in 338 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2014091653 7200 3600 1209600 3600 from server 199.43.133.53 in 350 ms.

We'd also have to re-think what "number of nameservers" means in this context.

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