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get_dns_stats: Expose total cache size and cached text entries

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It wasn't possible from script land to determine the total size
of the cache table held by the DNS_Mgr. Add the total and also
also the TEXT entries count.
This commit is contained in:
Arne Welzel 2023-03-03 10:48:50 +01:00
parent 16bdcd27bd
commit 2251c67e56
6 changed files with 16 additions and 0 deletions
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2
scripts/base/init-bare.zeek
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@ -757,6 +757,8 @@ type DNSStats: record {
pending: count; ##< Current pending queries.
cached_hosts: count; ##< Number of cached hosts.
cached_addresses: count; ##< Number of cached addresses.
cached_texts: count; ##< Number of cached text entries.
cached_total: count; ##< Total number of cached entries.
};
## Statistics about number of gaps in TCP connections.

1
src/DNS_Mgr.cc
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@ -1485,6 +1485,7 @@ void DNS_Mgr::GetStats(Stats* stats)
stats->cached_hosts = 0;
stats->cached_addresses = 0;
stats->cached_texts = 0;
stats->cached_total = all_mappings.size();
for ( const auto& [key, mapping] : all_mappings )
{

1
src/DNS_Mgr.h
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@ -209,6 +209,7 @@ public:
unsigned long cached_hosts;
unsigned long cached_addresses;
unsigned long cached_texts;
unsigned long cached_total;
};
/**

2
src/stats.bif
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@ -259,6 +259,8 @@ function get_dns_stats%(%): DNSStats
r->Assign(n++, static_cast<uint64_t>(dstats.pending));
r->Assign(n++, static_cast<uint64_t>(dstats.cached_hosts));
r->Assign(n++, static_cast<uint64_t>(dstats.cached_addresses));
r->Assign(n++, static_cast<uint64_t>(dstats.cached_texts));
r->Assign(n++, static_cast<uint64_t>(dstats.cached_total));
return r;
%}

2
testing/btest/Baseline/bifs.get_dns_stats/out Normal file
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@ -0,0 +1,2 @@
### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
[requests=0, successful=0, failed=0, pending=0, cached_hosts=0, cached_addresses=0, cached_texts=0, cached_total=0]

8
testing/btest/bifs/get_dns_stats.test Normal file
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@ -0,0 +1,8 @@
# @TEST-DOC: With FAKE_DNS mode caching is disabled, so testing is difficult, invoke the bif once at least.
# @TEST-EXEC: zeek -b %INPUT >out
# @TEST-EXEC: btest-diff out
event zeek_init()
{
print get_dns_stats();
}