Parallel queries aren't handled correctly

[kunpw]

When jDnsProxy receives two or more parallel queries over UDP, for example, parallel queries of A and AAAA records of one domain over UDP, the default behavior on many Linux installs, the response for the last query in this series will be used as responses to all queries in this series.

This leads to wrong caching as well.

[moparisthebest]

What is incorrect about the response?

[kunpw]

Let me give an examaple. It's been some time so my memory could be inaccurate.

Time MessageID SrcPort DestPort Query/Response
1 32124 10000 53 A firefox.settings.services.mozilla.com
1 32125 10000 53 AAAA firefox.settings.services.mozilla.com
1 32126 10001 53 A github.com
1 32127 10001 53 AAAA github.com
1 32128 10002 53 A example.com
1 32129 10002 53 AAAA example.com

2 32129 53 10000 AAAA example.com 10.222.222.222
2 32129 53 10000 AAAA example.com 10.222.222.222
2 32129 53 10001 AAAA example.com 10.222.222.222
2 32129 53 10001 AAAA example.com 10.222.222.222
2 32129 53 10002 AAAA example.com 10.222.222.222
2 32129 53 10002 AAAA example.com 10.222.222.222

As you can see, the response for the last query in this series is used as responses to all queries in this series.