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DNS resolvers and recursive servers MUST support UDP, and
SHOULD support TCP, for sending (non-zone-transfer) queries.
Specifically, a DNS resolver or server that is sending a
non-zone-transfer query MUST send a UDP query first. If the
Answer section of the response is truncated and if the
requester supports TCP, it SHOULD try the query again using
TCP.
.........
Truncated responses MUST NOT be saved (cached) and later
used in such a way that the fact that they are truncated is
lost.
Instead of following up with a TCP query which is unsupported, currently the library will follow up with DNS A query. Based on the recommendation above, it's better to discard the response and raise error.
Thanks to Daniel Schopf for the report.
2019-05-23 14:42:29: @trengginaschanged status from new to closed
2019-05-23 14:23:00: @trengginas created the issue on trac ticket 2200
The standard stated:
Instead of following up with a TCP query which is unsupported, currently the library will follow up with DNS A query. Based on the recommendation above, it's better to discard the response and raise error.
Thanks to Daniel Schopf for the report.
2019-05-23 14:42:29: @trengginas changed status from new to closed
2019-05-23 14:42:29: @trengginas set owner to @trengginas
2019-05-23 14:42:29: @trengginas set resolution to fixed
2019-05-23 14:42:29: @trengginas commented
In r6000:
Close #2200: Ignore/discard DNS SRV response with truncated flag set.
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