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Add resolver fallback to the null resolver (getaddrinfo) #103

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Add resolver fallback to the null resolver (getaddrinfo) #103

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Commits on Jul 25, 2023

  1. Add resolver fallback to the null resolver (getaddrinfo) 

    This enables a best-effort, two-step resolution when a resolver is
configured:
- if the DNS resolver returns any domain, that record is used with its
  corresponding TTL
- otherwise, the module tries resolving the name with the default, NULL
  resolver, which is just a wrapper over getaddrinfo
  * if the resolution succeeds, this was likely a domain in /etc/hosts
    or an IP literal, which was not known by the DNS server. The
    associated record has no TTL value and uses the default director
    TTL.
  * if the resolution fails, this was likely a bad domain. No records
    are stored and a new request is made after the default director TTL,
    as was done previously.
    @delthas
    delthas committed Jul 25, 2023
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