Hi Iwase,
Thank you for your reply.
Sure I will use binary_str().
But why the contents from payload are seen differently for pkt[-1]( I mean
when the packet contains payload) and for pkt.data. The pkt.data prints out
some symbols while pkt[-1] does not.
The actual text file does not have these symbols.
Thanks
Gandhimathi
On 30 March 2016 at 21:22, Iwase Yusuke <iwase.yusu...@gmail.com> wrote:
> Hi,
>
> pkt.data contains the raw binary data of packets,
> so outputs of "print" is not human readable format.
>
> To convert it human readable, how about using ryu.utils.binary_str()?
>
>
> $ git diff
> diff --git a/ryu/app/simple_switch_13.py b/ryu/app/simple_switch_13.py
> index 3e7c598..f39b374 100644
> --- a/ryu/app/simple_switch_13.py
> +++ b/ryu/app/simple_switch_13.py
> @@ -21,6 +21,7 @@ from ryu.ofproto import ofproto_v1_3
> from ryu.lib.packet import packet
> from ryu.lib.packet import ethernet
> from ryu.lib.packet import ether_types
> +from ryu.utils import binary_str
> class SimpleSwitch13(app_manager.RyuApp):
> @@ -79,6 +80,9 @@ class SimpleSwitch13(app_manager.RyuApp):
> pkt = packet.Packet(msg.data)
> eth = pkt.get_protocols(ethernet.ethernet)[0]
> + print('pkt.data[:6]=%s' % pkt.data[:6])
> + print('binary_str(pkt.data[:6])=%s' % binary_str(pkt.data[:6]))
> +
> if eth.ethertype == ether_types.ETH_TYPE_LLDP:
> # ignore lldp packet
> return
>
>
> $ ryu-manager ryu.app.simple_switch_13
> loading app ryu.app.simple_switch_13
> loading app ryu.controller.ofp_handler
> instantiating app ryu.app.simple_switch_13 of SimpleSwitch13
> instantiating app ryu.controller.ofp_handler of OFPHandler
> pkt.data[:6]=������
> binary_str(pkt.data[:6])=\xff\xff\xff\xff\xff\xff
> packet in 1 96:a4:5e:ec:aa:f3 ff:ff:ff:ff:ff:ff 1
> pkt.data[:6]=��^��
> binary_str(pkt.data[:6])=\x96\xa4\x5e\xec\xaa\xf3
> packet in 1 56:8a:4e:de:66:ae 96:a4:5e:ec:aa:f3 2
> pkt.data[:6]=V�N�f�
> binary_str(pkt.data[:6])=\x56\x8a\x4e\xde\x66\xae
> packet in 1 96:a4:5e:ec:aa:f3 56:8a:4e:de:66:ae 1
>
>
> Thanks
>
>
> On 2016年03月31日 01:15, Gandhimathi Velusamy wrote:
>
>> Hi,
>> I trying to get first few bytes of payload of the packet_in.
>> if I use *pkt[-1]* to extract the payload, I am getting " 'tcp' object is
>> not iterable" error.
>>
>> other wise, if I use *pkt.data* , I am seeing some unknown symbols
>> prepended with payload.
>>
>> def_packet_in_handler(self, ev):
>>
>> # If you hit this you might want to increase
>>
>> # the "miss_send_length" of your switch
>>
>> ifev.msg.msg_len < ev.msg.total_len:
>>
>> self.logger.debug("packet truncated: only %s of %s bytes",
>>
>> ev.msg.msg_len, ev.msg.total_len)
>>
>> msg = ev.msg
>>
>> datapath = msg.datapath
>>
>> ofproto = datapath.ofproto
>>
>> parser = datapath.ofproto_parser
>>
>> in_port = msg.match['in_port']
>>
>>
>> pkt = packet.Packet(msg.data)
>>
>> eth = pkt.get_protocols(ethernet.ethernet)[0]
>>
>> data = pkt.data
>>
>> ifdata:
>>
>> print"data:", data
>>
>>
>> ifeth.ethertype == ether_types.ETH_TYPE_LLDP:
>>
>>
>> # ignore lldp packet
>>
>> return
>>
>> dst = eth.dst
>>
>> src = eth.src
>>
>> pkt_arp = pkt.get_protocol(arp.arp)
>>
>> pkt_ipv4 = pkt.get_protocol(ipv4.ipv4)
>>
>> ifpkt_ipv4:
>>
>> src_ip = pkt_ipv4.src
>>
>> dst_ip = pkt_ipv4.dst
>>
>> print"IP_SRC:", src_ip
>>
>> print"IP_DST:", dst_ip
>>
>>
>> pkt_tcp = pkt.get_protocol(tcp.tcp)
>>
>> ifpkt_tcp:
>>
>> tcp_src_port = pkt_tcp.src_port
>>
>> tcp_dst_port = pkt_tcp.dst_port
>>
>> print"TCP_Source_port:", tcp_src_port
>>
>> print"TCP_Dst_port:", tcp_dst_port
>>
>>
>> pkt_icmp = pkt.get_protocol(icmp.icmp)
>>
>> ifpkt_icmp:
>>
>> data= pkt_icmp.data
>>
>> print"ICMP Contains:", data
>>
>>
>> if( notpkt_arp):
>>
>> payload = bytearray(pkt.data)
>>
>> payload1 = pkt[-1]
>>
>> print"Payload by pkt[-1]:", payload1
>>
>> ifpayload:
>>
>> print"Payload:", payload, "length_payload:", len(payload)
>>
>> print"Payload of six bytes:", payload[0:6]
>>
>>
>>
>>
>> *The output I am seeing when I am using netcat to send a text file from
>> h1 to h2 connected by OVS:*
>>
>> packet in 37769644528961 02:f6:aa:70:88:e7 02:e4:2e:e4:8a:23 5
>>
>> packet truncated: only 170 of 1514 bytes
>>
>> data: ?.?#??p?E???@@B
>>
>>
>>
>>
>>
>>
>> ?
>>
>> '?,??G???Qi
>>
>> ??2?&?tadata field called Tunnel-ID associated with it (see A.2.3.7)
>>
>> IP_SRC: 10.10.1.1
>>
>> IP_DST: 10.10.1.10
>>
>> TCP_Source_port: 33292
>>
>> TCP_Dst_port: 9999
>>
>> Payload by pkt[-1]: tadata field called Tunnel-ID associated with it (see
>> A.2.3.7)
>>
>> Payload: ?.?#??p?E???@@B
>>
>>
>>
>>
>>
>>
>> ?
>>
>> '?,??G???Qi
>>
>> ??2?&?tadata field called Tunnel-ID associated with it (see A.2.3.7)
>> length_payload: 128
>>
>> Payload of six bytes: ?.?#
>>
>>
>> May I please, know how to get first six bytes of payload?
>>
>> Thanks
>>
>> Gandhimathi
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Transform Data into Opportunity.
>> Accelerate data analysis in your applications with
>> Intel Data Analytics Acceleration Library.
>> Click to learn more.
>> http://pubads.g.doubleclick.net/gampad/clk?id=278785471&iu=/4140
>>
>>
>>
>> _______________________________________________
>> Ryu-devel mailing list
>> Ryu-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/ryu-devel
>>
>>
------------------------------------------------------------------------------
Transform Data into Opportunity.
Accelerate data analysis in your applications with
Intel Data Analytics Acceleration Library.
Click to learn more.
http://pubads.g.doubleclick.net/gampad/clk?id=278785471&iu=/4140
_______________________________________________
Ryu-devel mailing list
Ryu-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/ryu-devel
