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
if ev.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
if data:
print "data:", data
if eth.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)
if pkt_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)
if pkt_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)
if pkt_icmp:
data= pkt_icmp.data
print "ICMP Contains:", data
if ( not pkt_arp):
payload = bytearray(pkt.data)
payload1 = pkt[-1]
print "Payload by pkt[-1]:", payload1
if payload:
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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