[FS#4140] umdns does not respect legacy queries (not from port 5353)
openwrt-bugs at lists.openwrt.org
Wed Nov 17 12:14:25 PST 2021
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A new Flyspray task has been opened. Details are below.
User who did this - Kirill Elagin (kirelagin)
Attached to Project - OpenWrt/LEDE Project
Summary - umdns does not respect legacy queries (not from port 5353)
Task Type - Bug Report
Category - Packages
Status - Unconfirmed
Assigned To -
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - According to [[https://datatracker.ietf.org/doc/html/rfc6762#section-6.7|Section 6.7 of the RFC]], if the query was sent not from port 5353, the responder MUST respond over unicast and, most importantly, to the same port that the query was sent from.
This is what currently prevents
dig -p 5353 @22.214.171.124
from working, since dig is expecting the response on the random port it sent its query from, but umdns, contrary to the specifiation, always sends to port 5353.
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