Yup. Worked as expected. Cheers, Curtis
On Mar 12, 2014, at 12:17 AM, Murphy McCauley <murphy.mccau...@gmail.com> wrote: > If you wanted to check the attached slightly tweaked version of dns.py, I'd > push it to dart. > > -- Murphy > <dns.py> > On Mar 11, 2014, at 9:11 PM, Curtis Taylor <yamahabo...@gmail.com> wrote: > >> 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 >>> >> >
