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Code Issues Releases Wiki Activity

Reduce the number of fetches we make when looking up addresses

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If there are more that 5 NS record for a zone only perform a
maximum of 4 address lookups for all the name servers.  This
limits the amount of remote lookup performed for server
addresses at each level for a given query.
This commit is contained in:
Mark Andrews
2020-02-06 17:19:10 +11:00
committed by Michał Kępień
parent e7abb07030
commit 3ee5ea2fdb
3 changed files with 28 additions and 4 deletions
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5
lib/dns/adb.c
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@@ -440,6 +440,7 @@ log_quota(dns_adbentry_t *entry, const char *fmt, ...) ISC_FORMAT_PRINTF(2, 3);
#define FIND_GLUEOK(fn) (((fn)->options & DNS_ADBFIND_GLUEOK) != 0)
#define FIND_HAS_ADDRS(fn) (!ISC_LIST_EMPTY((fn)->list))
#define FIND_RETURNLAME(fn) (((fn)->options & DNS_ADBFIND_RETURNLAME) != 0)
#define FIND_NOFETCH(fn) (((fn)->options & DNS_ADBFIND_NOFETCH) != 0)
/*
* These are currently used on simple unsigned ints, so they are
@@ -3234,7 +3235,9 @@ fetch:
} else {
have_address = false;
}
if (wanted_fetches != 0 && !(FIND_AVOIDFETCHES(find) && have_address)) {
if (wanted_fetches != 0 && !(FIND_AVOIDFETCHES(find) && have_address) &&
!FIND_NOFETCH(find))
{
/*
* We're missing at least one address family. Either the
* caller hasn't instructed us to avoid fetches, or we don't