[lwip-devel] [bug #58473] Trailing dot in hostname results in extraneous label (and corrupt packet)

[Erik Ekman]

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] == '.') {
    hostnamelen--;
  }

http://git.savannah.nongnu.org/cgit/lwip.git/tree/src/core/dns.c#n486

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