Murphy, Exactly as you suggested. 3 changes did the trick.
* Added at Line 244 packet.dns: elif r.qtype == 28: assert isinstance(r.rddata, IPAddr6) return s + r.rddata.toRaw() * Changed Line 435 packet.dns: return IPAddr6.from_raw(l[beg_index : beg_index + dlen]) * Added at line 521 (semi-arbitrary) addresses.py: def toRaw (self): return self.raw Thanks for the help! —Curtis On Mar 11, 2014, at 11:13 PM, Murphy McCauley <murphy.mccau...@gmail.com> wrote: > On Mar 11, 2014, at 7:35 PM, Curtis Taylor <yamahabo...@gmail.com> wrote: > >> Hi, >> >> I’m trying to parse and alter AAAA (IPv6) DNS responses with POX, but I get >> the following error: >> ��B�)'packet:(dns) parsing answers: Bad address format >> >> The error stems from around line 398 in addresses.py. At that point in the >> execution, my IPv6 address (converted to hex from binary) is >> 20010db8000000000000ff0000428329, which is correct. However, it appears that >> POX is attempting to split, based on colons, but these shouldn’t be in the >> binary representation of the IP -- (isinstance(addr, bytes) and not raw) is >> True. > > I don't know what "binary representation" means in this context. Is this a > string containing 32 hex characters? Or is it 16 raw bytes? > > The latter one (16 raw bytes) should be supported by IPAddr6 if it's passed > into the constructor with raw=True (or using the from_raw() factory). The > former isn't supported -- it needs to be a properly formatted IPv6 address > (e.g., as per rfc5952), which contains colons. > > It seems like packet.dns maybe has a bug here where line 432 should use the > from_raw() factory but doesn't. If you make that fix does that help? > >> I’ve attempted to alter addresses.py change addr from bytes to a IPv6 string >> separated by colons (2001:0db8:0000:0000:0000:ff00:0042:8329), but I only >> break things later down the line (dns.py for me). I also see nothing >> irregular with the OpenFlow traffic to the controller. > > Can you elaborate on what breaks and how it breaks? Does it break in the dns > class's hdr() method? If so, a quick guess is that putData() needs an if > clause for qtype == 28 which is much like the one for qtype == 1. > >> My current setup: >> POX - 0.2.0 (carp) - l3_learning (also shows parsing error as above) >> Mininet with custom topology >> BIND9 - the entry in question looks like "server1 IN AAAA >> 2001:db8::ff00:42:8329”. Wireshark shows nothing wrong with the DNS >> request/response. >> >> Any help would be appreciated. >> >> Cheers, >> Curtis >