Resolver: fixes in A processing.
Resolver: fixes in A processing.

Verify that class of RR is "IN".
Verify that RR data length is exactly four octets.
Correctly shift to the next RR if RR type is unknown.

firebase/nginx,hy0kl/nginx,hy0kl/nginx,firebase/nginx,firebase/nginx,firebase/nginx,hy0kl/nginx