Hello,

The current DNS code checks, when making an A query, whether the name is in fact an IPv4 address literal. Same for AAAA query with IPv6 address literal. This is good.

However, nothing prevents A queries for IPv6 address literals or AAAA queries for IPv4 address literals. This is wrong.

Here's the bug in action (anonymized to protect the innocent):

1.2.3.4 -> 5.6.7.8 SIP 830 Request: ACK sip:foobar@9.10.11.12:5060;transport=udp
5.6.7.8 -> 1.2.3.4 DNS 72 Standard query AAAA 9.10.11.12

Attached is a simple patch to fix the bug (of which there are three distinct instances).

Comments?

Simon

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