我写了一个简单的网络流量监视器来获得B/s和/或总数据传输率(B)。然而，当我用ftp(使用Total Commander)传输一个文件来测试它时，我不能让它把Total transfer作为文件大小来衡量。它总是比实际尺寸小得多。

我不确定我是不是做错了什么。。

我设置的BPF过滤器是dst

下面是我的源代码：import threading

import sys

import pcapy

import time

import logging as logger

class NetMonitor(threading.Thread):

_timeout = 1

@classmethod

def get_net_interfaces(cls):

return pcapy.findalldevs()

def __init__(self, device, bpf_filter):

threading.Thread.__init__(self)

self.active = True

self._net_monitor = pcapy.open_live(device, 65535, 0, 1000) #self.timeout * 1000)

self._net_monitor.setfilter(bpf_filter)

#self.dumper = self.net_monitor.dump_open("pkt_dump.txt")

self._current_bytes_rate = 0

self.total_transfer = 0 # total number of Bytes transfered

#

self._tmp_bytes_per_sec_sum = 0 # sums up B/s values from each dispatch iteration (eventually used to calc average value)

self._inc = 0 # number of dispatch iterations (eventually used to calc average B/s value)

#--->

self._dispatch_bytes_sum = 0 # sums up packets size for one dispatch call

def __handle_packet(self, header, data):

# method is called for each packet by dispatch call (pcapy)

self._dispatch_bytes_sum += len(data) #header.getlen() #len(data)

#logger.debug("h: ({}, {}, {}), d:{}".format(header.getlen(), header.getcaplen(), header.getts(), len(data)))

#self.dumper.dump(header, data)

def update(self):

self._dispatch_bytes_sum = 0

# process packets

packets_nr = self._net_monitor.dispatch(-1, self.__handle_packet)

self.total_transfer += self._dispatch_bytes_sum

self._inc += 1

self._current_bytes_rate = self._dispatch_bytes_sum # add single dispatch B/s -> timeout is 1 s

self._tmp_bytes_per_sec_sum += self._current_bytes_rate

logger.debug('inc:{}, current rate: {} B/s, avg rate: {} B/s, total:{} B'.format(self._inc, self.current_rate, self.avg_rate, self.total_transfer))

return self._current_bytes_rate, packets_nr

def get_avg_bytes_rate(self):

if self._inc:

return self._tmp_bytes_per_sec_sum / self._inc

else:

return 0

def get_current_bytes_rate(self):

return self._current_bytes_rate

def run(self):

while(self.active):

self.update()

time.sleep(self._timeout)

# average B/s rate

avg_rate = property(get_avg_bytes_rate)

# current B/s rate

current_rate = property(get_current_bytes_rate)

if __name__ == '__main__':

filter = ' '.join(sys.argv[2:])

print filter

#nm0 = NetMonitor(pcapy.findalldevs()[0], filter)

nm1 = NetMonitor(pcapy.findalldevs()[1], filter)

nm1.start()

start_time = time.time()

while time.time() - start_time < int(sys.argv[1]):

print "current {} B/s, avg {} B/s, total transfer {} B".format(nm1.current_rate, nm1.avg_rate, nm1.total_transfer)

time.sleep(1)

nm1.active = False

nm1.join()

print "++++++ total: {}, avg: {}".format(nm1.total_transfer, nm1.avg_rate)

任何建议都非常感谢。

干杯。