[Pdns-users] Problem with test python pipe backend

[Dmitriy Tochansky]

Hi!

I'm trying to write own pipe-backend for powerdns, but can't get it work 
properly. I'm starting pdn_server with my backend and try to test it 
with command:

# nslookup example.com 127.0.0.1
and
# dig @127.0.0.1 example.com

First problem is that first query to backend comes with type 
'SOA'(backend abi version 2):

>> Q   example.com IN  SOA -1  127.0.0.1   0.0.0.0

I though 'Ok, lets start from SOA' and try to write bit of code. In 
debug I can see that backend started, did receive query and send answer 
to pdns. But seems like something goes wrong and pdns didn't get it. 
Can't figure out whats a problem. Source code and debug is following:

=======
#!/usr/bin/python

from sys import stdin, stdout, stderr

data = stdin.readline()
stdout.write("OK\tCC DNS Backend\n")
stdout.flush()

stderr.write("$$$ Main loop started...\n")

while True:
     line = stdin.readline().strip()

     kind, qname, qclass, qtype, id, ip, mask = line.split('\t')

     if kind == 'Q':
         stderr.write('$$$ Got request ' + qname + '\n')
         if qtype != 'SOA':
             r = "DATA\t'+qname+'\t'+qtype+'\t'+qclass+'\t'+'127.0.0.1\n"
             stderr.write(r)
             stdout.write(r)
         else:
             stderr.write("$$$ Sending SOA\n")
             r = "DATA\texample.com\tIN\tSOA\t86400\t1\tahu.example.com 
ns1.example.com 2008080300 1800 3600 604800 3600\n"
             stdout.write(r)
             stderr.write(r)

         stdout.write("END\n")
         stderr.write("END\n")
======

and debug:

======
Dec 05 15:36:43 Done launching threads, ready to distribute questions
Dec 05 15:36:49 Query: 'Q   example.com IN  SOA -1  127.0.0.1   0.0.0.0'
$$$ Got request example.com
$$$ Sending SOA
DATA    example.com IN  SOA 86400   1   ahu.example.com ns1.example.com 
2008080300 1800 3600 604800 3600
END
$$$ Main loop started...
Dec 05 15:36:49 Backend launched with banner: OK    CC DNS Backend
$$$ Main loop started...
Dec 05 15:36:49 Backend launched with banner: OK    CC DNS Backend
Dec 05 15:36:54 Query: 'Q   example.com IN  SOA -1  127.0.0.1   0.0.0.0'
$$$ Got request example.com
$$$ Sending SOA
DATA    example.com IN  SOA 86400   1   ahu.example.com ns1.example.com 
2008080300 1800 3600 604800 3600
END
Dec 05 15:36:59 Query: 'Q   example.com IN  SOA -1  127.0.0.1   0.0.0.0'
$$$ Got request example.com
$$$ Sending SOA
DATA    example.com IN  SOA 86400   1   ahu.example.com ns1.example.com 
2008080300 1800 3600 604800 3600
END
======

Any ideas?

-- 
Dmitriy