Fix FQDN lookup on hosts where ndots < channel ndots#345
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bradh352 merged 1 commit intoc-ares:masterfrom Aug 24, 2020
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Fix FQDN lookup on hosts where ndots < channel ndots#345bradh352 merged 1 commit intoc-ares:masterfrom
bradh352 merged 1 commit intoc-ares:masterfrom
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…lue (c-ares#345) If a query is performed for dynamodb.us-east-1.amazonaws.com. with ndots=5, it was attempting to search the search domains rather than just attempting the FQDN that was passed it. This patch now at least attempts the FQDN first. We may need to determine if we should abort any further searching, however as is probably intended. Fix by: Jonathan Maye-Hobbs (@wheelpharoah)
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ares_create_query(), returns aARES_EBADNAMEwhen appending search list domains to the query name. As a result, c-ares fails to iterate through the search list & perform a query for what is actually a valid name.Since all channel tests are performed with the default ndots value, this case wasn't covered.
Bug repro & debugging explained here: https://github.com/wheelpharaoh/c-ares-exmaple