nothing is logged when querying a non-existing domain

[hapablanha]

Steps to reproduce:

1. build and run

git checkout clientquery --force make clean make debug

./passivedns -i ens192

3. query a non-existing domain

nslookup magicshield.test

Expected Result:

DNS request and answer can be found in /var/log/passivedns.log

Actual Result:

nothing can be found in /var/log/passivedns.log

Additional Info:

Error messages are seen in passivedns debug mode

[root@localhost src]# ./passivedns -i ens192

[*] PassiveDNS 1.1.3
[*] By Edward Bjarte Fjellsk?l <edward.fjellskaal@gmail.com>
[*] Using libpcap version 1.5.3
[*] Using ldns version 1.6.16
[*] Device: ens192
[*] Sniffing...

[passivedns.c:359(parse_udp)] [D] Parsing UDP packet...
[dns.c:180(dns_parser)] [D] New DNS Query
[dns.c:192(dns_parser)] [D] DNS Query with TID = 29148
[dns.c:228(update_query_cxt)] [*] rrcount_query: 1
[dns.c:236(update_query_cxt)] [D] rdf_data: 0x131ede0
[dns.c:252(update_query_cxt)] QUERY DOMAIN: magicshield.test.
[dns.c:204(dns_parser)] [D] DNS Query for domain: magicshield.test.
[passivedns.c:359(parse_udp)] [D] Parsing UDP packet...
[dns.c:109(dns_parser)] [D] DNS Answer
[dns.c:112(dns_parser)] [D] DNS Query TID match Answer TID: 29148
[dns.c:129(dns_parser)] [D] DNS packet with Recursion Desired (RD) bit set!
[dns.c:273(process_dns_answer)] [*] rrcount_query: 1
[dns.c:281(process_dns_answer)] [D] rdf_data: 0x131ede0
[dns.c:319(cache_dns_objects)] [D] domain_name: magicshield.test.
[dns.c:320(cache_dns_objects)] [D] dns_answer_domain_cnt: 0
[dns.c:328(cache_dns_objects)] [D] DNS client query deleted from pi->cxt->pquery
[dns.c:335(cache_dns_objects)] [D] Error return code: 3
[dns.c:369(cache_dns_objects)] [D] Error return code 4 was not processed:0
[passivedns.c:359(parse_udp)] [D] Parsing UDP packet...
[dns.c:180(dns_parser)] [D] New DNS Query
[dns.c:192(dns_parser)] [D] DNS Query with TID = 46880
[dns.c:228(update_query_cxt)] [*] rrcount_query: 1
[dns.c:236(update_query_cxt)] [D] rdf_data: 0x131ef10
[dns.c:252(update_query_cxt)] QUERY DOMAIN: magicshield.test.
[dns.c:204(dns_parser)] [D] DNS Query for domain: magicshield.test.
[passivedns.c:359(parse_udp)] [D] Parsing UDP packet...
[dns.c:109(dns_parser)] [D] DNS Answer
[dns.c:112(dns_parser)] [D] DNS Query TID match Answer TID: 46880
[dns.c:129(dns_parser)] [D] DNS packet with Recursion Desired (RD) bit set!
[dns.c:273(process_dns_answer)] [*] rrcount_query: 1
[dns.c:281(process_dns_answer)] [D] rdf_data: 0x131ef10
[dns.c:319(cache_dns_objects)] [D] domain_name: magicshield.test.
[dns.c:320(cache_dns_objects)] [D] dns_answer_domain_cnt: 0
[dns.c:328(cache_dns_objects)] [D] DNS client query deleted from pi->cxt->pquery
[dns.c:335(cache_dns_objects)] [D] Error return code: 3
[dns.c:369(cache_dns_objects)] [D] Error return code 4 was not processed:0
[dns.c:1048(expire_all_dns_records)] [D] Expiring all domain records
[passivedns.c:533(end_all_sessions)] CXT in list before cleaning:          2
[passivedns.c:534(end_all_sessions)] CXT in list after  cleaning:          0

-- Total DNS records allocated            :           0
-- Total DNS assets allocated             :           0
-- Total DNS packets over IPv4/TCP        :           0
-- Total DNS packets over IPv6/TCP        :           0
-- Total DNS packets over TCP decoded     :           0
-- Total DNS packets over TCP failed      :           0
-- Total DNS packets over IPv4/UDP        :           4
-- Total DNS packets over IPv6/UDP        :           0
-- Total DNS packets over UDP decoded     :           4
-- Total DNS packets over UDP failed      :           0
-- Total packets received from libpcap    :           4
-- Total Ethernet packets received        :           4
-- Total VLAN packets received            :           0

[*] passivedns ended.

[hapablanha]

It has turned to be clear that non-existing domain can be supported, just need turn on it in the config. config.dnsfe |= DNS_SE_CHK_NXDOMAIN;