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
>
>
>
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