我写了一个简单的网络流量监控程序，以获取数据传输速率（以B/s为单位）和/或总数据传输量（以B为单位）。然而，当我使用ftp（使用Total Commander）传输文件进行测试时，它无法将总传输大小作为文件大小来测量。它始终给出比实际文件大小要低得多的值。我不确定自己是否做错了什么。
我设置的BPF过滤器是：
以下是我的源代码：
任何建议都非常感谢。 干杯。
dst <IP of ftp server pc>
以下是我的源代码：
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
#<--- this is to calc average transfer B/s
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。