Code:
void MyDnsBackend::lookup(const QType& qtype, const string& qdomain,
DNSPacket* pkt, int zoneId)
{
L << Logger::Info << "Domain: " << qdomain << " Code type: " <<
qtype.getCode() << endl;
if(qtype.getCode() == QType::SOA || qtype.getCode() == QType::CNAME)
return;
if (boost::algorithm::starts_with(qdomain, "*"))
return;
//else - handle request
//...
}
pdns.conf:
cache-ttl=0
negquery-cache-ttl=0
query-cache-ttl=0
recursive-cache-ttl=0
launch=mybackend
module-dir=/usr/share/mods/
recursor=127.0.0.1:53
local-address=127.0.0.1
daemon=yes
Dig output:
; <<>> DiG 9.7.6-P1 <<>> -t A google.com @<server-ip>
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41566
;; flags: qr rd ra; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;google.com. IN A
;; ANSWER SECTION:
google.com. 300 IN A 173.194.32.3
google.com. 300 IN A 173.194.32.7
google.com. 300 IN A 173.194.32.0
google.com. 300 IN A 173.194.32.1
google.com. 300 IN A 173.194.32.8
google.com. 300 IN A 173.194.32.4
google.com. 300 IN A 173.194.32.14
google.com. 300 IN A 173.194.32.5
google.com. 300 IN A 173.194.32.2
google.com. 300 IN A 173.194.32.6
google.com. 300 IN A 173.194.32.9
;; Query time: 319 msec
;; SERVER: <server-ip>#53(<server-ip>)
;; WHEN: Tue Dec 4 08:55:27 2012
;; MSG SIZE rcvd: 204
pdns log output:
Dec 4 02:59:04 server pdns[27079]: PowerDNS 3.1 (C) 2001-2012 PowerDNS.COM
BV (Nov 28 2012, 09:32:08, gcc 4.4.6 20120305 (Red Hat 4.4.6-4)) starting up
Dec 4 02:59:04 server pdns[27079]: PowerDNS comes with ABSOLUTELY NO
WARRANTY. This is free software, and you are welcome to redistribute it
according to the terms of the GPL version 2.
Dec 4 02:59:04 server pdns[27079]: DNS Proxy launched, local port 16203,
remote 127.0.0.1:53
Dec 4 02:59:04 server pdns[27079]: Creating backend connection for TCP
Dec 4 02:59:04 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:04 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: [MyDnsBackend] Backend initialization
completed. MySQL client version = 5.1.66
Dec 4 02:59:33 server pdns[27079]: Start dnsfence backend initialization...
Dec 4 02:59:33 server pdns[27079]: About to create 3 backend threads for
UDP
Dec 4 02:59:33 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: Start dns backend initialization...
Dec 4 02:59:33 server pdns[27079]: Done launching threads, ready to
distribute questions
Dec 4 02:59:35 server pdns[29319]: Domain: google.com Code type: 6
Dec 4 02:59:35 server pdns[29319]: Domain: com Code type: 6
Dec 4 02:59:35 server pdns[29319]: Domain: Code type: 6
I log all incoming requests. pdns-3.1:
+----+----------+------------+---------------+------------+------+-----------+
| id | logdate| utime | ip | query
| type | times_met |
+----+----------+------------+---------------+------------+------+-----------+
| 18 | 20121204 | 1354586125 | <source ip> | google.com | SOA |
1 |
| 19 | 20121204 | 1354586125 | <source ip> | com | SOA |
1 |
| 20 | 20121204 | 1354586125 | <source ip> | | SOA |
1 |
+----+----------+------------+---------------+------------+------+-----------+
3 rows in set (0.03 sec)
The same request on pdns-2.9.22 server:
+-------+----------+------------+---------------+-------------------------+------+-----------+
| id | logdate | utime | ip | query
| type | times_met |
+-------+----------+------------+---------------+-------------------------+------+-----------+
| 63846 | 20121204 | 1354585324 | <source ip> | google.com |
A | 187 |
+-------+----------+------------+---------------+-------------------------+------+-----------+
Another example:
; <<>> DiG 9.7.6-P1 <<>> facebook.com @<server-ip>
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7639
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;facebook.com. IN A
;; ANSWER SECTION:
facebook.com. 174 IN A 66.220.152.16
facebook.com. 174 IN A 173.252.100.16
facebook.com. 174 IN A 66.220.158.16
facebook.com. 174 IN A 173.252.101.16
facebook.com. 174 IN A 69.171.229.16
facebook.com. 174 IN A 69.171.224.32
;; Query time: 290 msec
;; SERVER: <server-ip>#53(<server-ip>)
;; WHEN: Tue Dec 4 10:14:50 2012
;; MSG SIZE rcvd: 126
pdns log output:
Dec 4 04:14:47 server pdns[30109]: Domain: facebook.com Code type: 6
Dec 4 04:14:47 server pdns[30109]: Domain: com Code type: 6
Dec 4 04:14:47 server pdns[30109]: Domain: Code type: 6
database records:
pdns-3.1:
+----+----------+------------+---------------+--------------+------+-----------+
| id | logdate | utime | ip | query
| type | times_met |
+----+----------+------------+---------------+--------------+------+-----------+
| 18 | 20121204 | 1354586125 | <source ip> | google.com | SOA |
5 |
| 19 | 20121204 | 1354586125 | <source ip> | com | SOA |
8 |
| 20 | 20121204 | 1354586125 | <source ip> | | SOA
| 8 |
| 21 | 20121204 | 1354590734 | <source ip> | facebook.com | SOA |
3 |
+----+----------+------------+---------------+--------------+------+-----------+
4 rows in set (0.04 sec)
pdns-2.9.22:
+-------+----------+------------+---------------+------------------+------+-----------+
| id | logdate | utime | ip | query
| type | times_met |
+-------+----------+------------+---------------+------------------+------+-----------+
| 64420 | 20121204 | 1354592035 | <source ip> | facebook.com | A |
1 |
+-------+----------+------------+---------------+------------------+------+-----------+
pdns-2.9.22 correct detects SOA and A qtypes, but pdns-3.1 only SOA. May be
i missing something?
Best regards,
Ilya
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