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resolved: whenever a link starts/stops being relevant flush global DNS caches

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Let's add some protection for split horizon setups, where different
zones are visible on the same global DNS servers depending on where you
come from.

Fixes: #9196
This commit is contained in:
Lennart Poettering 2018-06-08 12:04:49 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 3ad9705824
commit 63b1219130
1 changed files with 5 additions and 0 deletions
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5
src/resolve/resolved-link.c
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@ -115,6 +115,11 @@ void link_allocate_scopes(Link *l) {
dns_server_reset_features_all(l->manager->fallback_dns_servers);
dns_server_reset_features_all(l->manager->dns_servers);
/* Also, flush the global unicast scope, to deal with split horizon setups, where talking through one
* interface reveals different DNS zones than through others. */
if (l->manager->unicast_scope)
dns_cache_flush(&l->manager->unicast_scope->cache);
}
/* And now, allocate all scopes that makes sense now if we didn't have them yet, and drop those which we don't