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

From: Erik Ekman
Subject: [lwip-devel] [bug #58473] Trailing dot in hostname results in extraneous label (and corrupt packet)
Date: Fri, 19 Jun 2020 06:14:47 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36

Follow-up Comment #6, bug #58473 (project lwip):

If we just do this change, lookups of the same domain with and without a
trailing dot will not share a hostlist entry but trigger a second lookup as I
understand it. Removing the dot before checking the list of cached entries
seems better to me.

dns_local_lookup already removes an extra dot early:

  hostnamelen = strlen(hostname);
  if (hostname[hostnamelen - 1] == '.') {



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