留学生辅导 #!/usr/bin/env python

#!/usr/bin/env python
import sys
import struct

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from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
from scapy.all import Packet, IPOption
from scapy.all import PacketListField, ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
from scapy.all import IP, UDP, Raw
from scapy.layers.inet import _IPOption_HDR

def get_if():
ifs=get_if_list()
iface=None
for i in get_if_list():
if “eth0” in i:
if not iface:
print “Cannot find eth0 interface”
return iface

class SwitchTrace(Packet):
fields_desc = [ IntField(“swid”, 0),
IntField(“qdepth”, 0)]
def extract_padding(self, p):
return “”, p

class IPOption_SI(IPOption):
name = “SI”
option = 31
fields_desc = [ _IPOption_HDR,
FieldLenField(“length”, None, fmt=”B”,
length_of=”swtraces”,
adjust=lambda pkt,l:l*2+4),
ShortField(“count”, 0),
PacketListField(“swtraces”,
SwitchTrace,
count_from=lambda pkt:(pkt.count*1)) ]

debug_pkt = None

def main():
# iface = ‘eth0’
# print “sniffing on %s” % iface
# sys.stdout.flush()

working_dir = ‘/home/vagrant/cs176b-assignments/winter22/assignment1’

f = open(‘{}/switch_stats.txt’.format(working_dir), ‘w’)

def handle_pkt(pkt):
print “got a packet”
pkt.show2()

def get_SI_header(l):
for h in l:
if h.option == 31:
print “Found SI header”
print “Could not find SI header for the following packet:”
pkt.show2()
return None
SI_header = get_SI_header(pkt[IP].options)

# record timestamp
# record switch ID
# record queue depth
data = ‘{},{},{}\n’.format(pkt.time,SI_header.swtraces[0].swid,SI_header.swtraces[0].qdepth)

f.write(data)

sys.stdout.flush()

sniff(filter=”udp”,iface = [“eth0″,”monitor-eth1″,”monitor-eth2″,”monitor-eth3”],
prn = lambda x: handle_pkt(x))
if __name__ == ‘__main__’:

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