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[lwip-devel] [bug #58473] Trailing dot in hostname results in extraneous

From: Mate Varga
Subject: [lwip-devel] [bug #58473] Trailing dot in hostname results in extraneous label (and corrupt packet)
Date: Mon, 8 Jun 2020 05:17:13 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.30 Safari/537.36 Edg/84.0.522.11

Follow-up Comment #3, bug #58473 (project lwip):

And yes, my original comment was incorrect. It should have been like (see the
extra zero-markers):

For example, an A query for foo.barbaz. should result in an UDP packet
fragment like
(3 char long label: foo, 6 char long label: barbaz, type: 1, class 1)
Actual behavior
LWIP considers the trailing dot as a separate label with zero length.
Therefore the above example will result in the following packet fragment:


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