Thanks Murphy that fixes the typeerror but I'm still not sure if the packets
are correct because I'm not able to make a connection. In Wireshark for this
ssh packet_in's it's saying "This frame is a suspected retransmission" and
in tcpdump at the host that is getting these packets its saying:
18:13:48.227362 IP truncated-ip - 730 bytes missing! 130.127.39.173.59276 >
130.127.39.235.ssh: P 40:832(792) ack 33 win 12 <nop,nop,timestamp 9797038
46103242>
Thanks,
Aaron
On Tue, Mar 1, 2011 at 5:39 PM, James "Murphy" McCauley <jam...@nau.edu>wrote:
> Looks like the problem is in the parsing. Here's a patch:
>
> --- a/src/nox/lib/packet/tcp.py
> +++ b/src/nox/lib/packet/tcp.py
> @@ -150,7 +150,7 @@ class tcp(packet_base):
> elif arr[i] == tcp_opt.MSS:
> if arr[i+1] != 4:
> raise Exception()
> - val = struct.unpack('!H',arr[i+2:i+4])
> + val = struct.unpack('!H',arr[i+2:i+4])[0]
> self.options.append(tcp_opt(tcp_opt.MSS,val))
> elif arr[i] == tcp_opt.WSOPT:
> if arr[i+1] != 3:
>
> -- Murphy
>
> On Tue, 2011-03-01 at 17:29 -0500, Aaron Rosen wrote:
> > Hi Murphy,
> >
> > I'm just trying to connect to a computer using ssh so when I do ssh
> > 130.127.39.235 I see these typeerror messages. I do not to anything
> > with the packet when it gets to the controller except tell it to
> > flood.
> >
> > The MSS of these packets are 1460 in the packet_in event.
> >
> > Any idea?
> >
> > Thanks,
> >
> > Aaron
> >
> >
> > On Tue, Mar 1, 2011 at 3:51 PM, James "Murphy" McCauley
> > <jam...@nau.edu> wrote:
> > You're not doing anything wrong here. You seem to be doing
> > something
> > wrong elsewhere. Specifically, you seem to have constructed
> > an MSS TCP
> > option with a tuple as its value, when the value should be
> > some sort of
> > integer.
> >
> > -- Murphy
> >
> >
> > On Tue, 2011-03-01 at 15:22 -0500, Aaron Rosen wrote:
> > > Hello I was wondering if someone could explain where I'm
> > going wrong
> > > here:
> > > I'm receiving a packet and then trying to send it back out
> > with
> > >
> > > self.send_openflow_packet(dpid,
> > > packet.tostring(),openflow.OFPP_FLOOD , inport)
> > >
> > > When I do this I'm getting the following exception:
> > >
> > > 00290|pyrt|ERR:unable to invoke a Python event handler:
> > > Traceback (most recent call last):
> > > File "./nox/lib/util.py", line 113, in f
> > > event.total_len, buffer_id, packet)
> > > File "./nox/coreapps/examples/aaronswitch.py", line 177,
> > in
> > > packet_in_callback
> > > self.forward(dpid, inport, packet, packet.arr, bufid)
> > > File "./nox/coreapps/examples/aaronswitch.py", line 96, in
> > forward
> > > self.send_openflow_packet(dpid,
> > > packet.tostring(),openflow.OFPP_FLOOD , inport)
> > > File "./nox/lib/packet/packet_base.py", line 114, in
> > tostring
> > > return ''.join((buf, self.next.tostring()))
> > > File "./nox/lib/packet/packet_base.py", line 114, in
> > tostring
> > > return ''.join((buf, self.next.tostring()))
> > > File "./nox/lib/packet/packet_base.py", line 109, in
> > tostring
> > > buf = self.hdr()
> > > File "./nox/lib/packet/tcp.py", line 215, in hdr
> > > packet += option.to_bytes()
> > > File "./nox/lib/packet/tcp.py", line 70, in to_bytes
> > > return struct.pack('!BBH',self.type,4,self.val)
> > > TypeError: unsupported operand type(s) for &: 'tuple' and
> > 'long'
> > >
> > > Thanks,
> > >
> > > Aaron
> > >
> > >
> > > --
> > > Aaron O. Rosen
> > > Masters Student - Network Communication
> > > 306B Fluor Daniel
> > > 843.425.9777
> > >
> >
> > > _______________________________________________
> > > nox-dev mailing list
> > > nox-dev@noxrepo.org
> > > http://noxrepo.org/mailman/listinfo/nox-dev_noxrepo.org
> >
> >
> >
> >
> >
> > --
> > Aaron O. Rosen
> > Masters Student - Network Communication
> > 306B Fluor Daniel
> > 843.425.9777
> >
>
>
>
--
Aaron O. Rosen
Masters Student - Network Communication
306B Fluor Daniel
843.425.9777
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