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After all /etc/resolv.conf is usually done when the network
configuration changes, which is a good reason to flush the global cache.
See: #2038
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If /etc/resolv.conf is missing, this should not result in the server
list to be cleared, after all the native data from resolved.conf
shouldn't be flushed out then. Hence flush out the data only if
/etc/resolv.conf exists, but we cannot read it for some reason.
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Let's split this out from the resolv.conf parser, so that this becomes
generically useful.
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This copies concepts we introduced for the DnsSearchDomain stuff, and
reworks the operations on lists of dns servers to be reusable and
generic for use both with the Link and the Manager object.
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With this change, we add a new object to resolved, "DnsSearchDomain="
which wraps a search domain. This is then used to introduce a global
search domain list, in addition to the existing per-link search domain
list which is reword to make use of this new object too.
This is preparation for implement proper unicast DNS search domain
support.
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Previously, there was a chance of memory corruption, because when
switching to the next DNS server we didn't care whether they linked list
of DNS servers was still valid.
Clean up lifecycle of the dns server logic:
- When a DnsServer object is still in the linked list of DnsServers for
a link or the manager, indicate so with a "linked" boolean field, and
never follow the linked list if that boolean is not set.
- When picking a DnsServer to use for a link ot manager, always
explicitly take a reference.
This also rearranges some logic, to make the tracking of dns servers by
link and globally more alike.
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No functional changes.
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