9740eae694e93b06658ff3b3045b22b591561e7c
Technically DNS allows any ASCII character to be used in the domain name. Also the DHCP specification for the FQDN option (RFC 4702) does not put restriction on labels. However, hostnames do have stricter requirements and typically should only use characters from a-z (case insensitve), 0-9 and minus. Currently we require hostname/FQDN to be either a hostname or a valid DNS name. Since dns_name_is_valid() allows any ASCII characters this allows to specify hostnames which are typically not valid. Check hostname/FQDN more strictly and require them to pass both tests. Specifically this requires the entire FQDN to be below 63.
systemd - System and Service Manager
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