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Cache SOAs and return them with cached NXDOMAIN/NODATA replies.

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Now we can cache arbirary RRs, give more correct answers when
replying negative answers from cache.

To implement this needed the DNS-doctor code to be untangled from
find_soa(), so it should be under suspicion for any regresssions
in that department.
This commit is contained in:
Simon Kelley
2024-02-01 23:37:11 +00:00
parent db07664f2a
commit 12ddb2a4b9
5 changed files with 820 additions and 732 deletions
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8
src/dnsmasq.c
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@@ -131,19 +131,11 @@ int main (int argc, char **argv)
'.' or NAME_ESCAPE then all would have to be escaped, so the
presentation format would be twice as long as the spec. */
daemon->keyname = safe_malloc((MAXDNAME * 2) + 1);
daemon->workspacename = safe_malloc((MAXDNAME * 2) + 1);
/* one char flag per possible RR in answer section (may get extended). */
daemon->rr_status_sz = 64;
daemon->rr_status = safe_malloc(sizeof(*daemon->rr_status) * daemon->rr_status_sz);
}
#endif
#if defined(HAVE_CONNTRACK) && defined(HAVE_UBUS)
/* CONNTRACK UBUS code uses this buffer, so if not allocated above,
we need to allocate it here. */
if (option_bool(OPT_CMARK_ALST_EN) && !daemon->workspacename)
daemon->workspacename = safe_malloc((MAXDNAME * 2) + 1);
#endif
#ifdef HAVE_DHCP
if (!daemon->lease_file)