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Revise resource handling for number of concurrent DNS queries.

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This used to have a global limit, but that has a problem when using
different servers for different upstream domains. Queries which are
routed by domain to an upstream server which is not responding will
build up and trigger the limit, which breaks DNS service for all other
domains which could be handled by other servers. The change is to make
the limit per server-group, where a server group is the set of servers
configured for a particular domain. In the common case, where only
default servers are declared, there is no effective change.
This commit is contained in:
Simon Kelley
2021-06-13 21:29:22 +01:00
parent 4a6550d69a
commit 3236f358f8
7 changed files with 87 additions and 120 deletions
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5
src/domain-match.c
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@@ -195,6 +195,11 @@ int lookup_domain(char *qdomain, int flags, int *lowout, int *highout)
return 1;
}
/* Return first server in group of equivalent servers; this is the "master" record. */
int server_samegroup(struct server *a, struct server *b)
{
return order_servers(a, b) == 0;
}
int filter_servers(int seed, int flags, int *lowout, int *highout)
{