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Don't waste time caching zero-TTL DNS records.

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This commit is contained in:
Simon Kelley
2019-10-25 17:31:53 +01:00
parent 122997da54
commit 1292e1a557
1 changed files with 7 additions and 0 deletions
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7
src/cache.c
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@@ -500,6 +500,13 @@ static struct crec *really_insert(char *name, union all_addr *addr, unsigned sho
if (insert_error) if (insert_error)
return NULL; return NULL;
/* we don't cache zero-TTL records. */
if (ttl == 0)
{
insert_error = 1;
return NULL;
}
/* First remove any expired entries and entries for the name/address we /* First remove any expired entries and entries for the name/address we
are currently inserting. */ are currently inserting. */
if ((new = cache_scan_free(name, addr, class, now, flags, &target_crec, &target_uid))) if ((new = cache_scan_free(name, addr, class, now, flags, &target_crec, &target_uid)))