Hi Yi,
I've had a go at getting your dns.py code running, but can't get it working yet.
I created the dns.py file in ryu/ryu/lib/packet, with your code in it, and
updated nmeta tc_policy.py to import it:
from ryu.lib.packet import dns
<snip>
if pkt_udp:
if pkt_udp.src_port == 53 or pkt_udp.dst_port == 53:
pkt_dns = pkt.get_protocol(dns.dns)
if pkt_dns:
print "TakeshiTseng dns worked...!"
else:
print "TakeshiTseng dns failed, pkt_dns is %s" % pkt_dns
<snip>
The output when a UDP DNS packet-in event occurs is:
dns_experimental_TakeshiTseng.dns failed, pkt_dns is None
Any idea why it isn't parsing valid DNS packets?
Regards,
Matt.
From: [email protected]
Date: Mon, 13 Apr 2015 19:20:59 +0800
To: [email protected]
CC: [email protected]
Subject: Re: [Ryu-devel] Parsing DNS packets with Ryu?
Hi
I wrote DNS packet parser, but I don't know how to test it.
I would appreciate it if someone can help me to test it.
https://github.com/TakeshiTseng/ryu/blob/dns/ryu/lib/packet/dns.py
Yi
2015-04-13 16:08 GMT+08:00 Matthew Hayes <[email protected]>:
Thank you to those who replied to my question re DNS parsing. I've since used
the dpkt library to do the DNS decode, and it is working fine.
FYI, this was for a Ryu app called nmeta that does policy-based traffic
classification, see:
http://mattjhayes.github.io/nmeta/
I have some observations on how the LLDP module could be improved, but will
send as a separate email.
Thanks,
Matt
From: [email protected]
Date: Mon, 16 Mar 2015 14:09:18 +0800
To: [email protected]
Subject: Re: [Ryu-devel] Parsing DNS packets with Ryu?
Hi, Matthew Hayes
There is no DNS parser lib in Ryu but you can use dpkt
(https://pypi.python.org/pypi/dpkt) to parsing DNS packet.
Cheers,
Che-Wei Lin, John Lin
Institute of Communication Engineering,
National Tsing Hua University
E-mail: [email protected]
Blog: linton.tw
Mobile: +886-952-301-269
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Yi Tseng (a.k.a Takeshi)
Taiwan National Chiao Tung University
Department of Computer Science
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