H3C 交换机telnet查看端口流量小工具

这两天实验室网络不给力，后来发现是有人占用了实验室太多的带宽，而登陆到实验室老的h3c s5500交换机上看端口流量情况很不方便，于是萌生写个小工具来统计端口流量情况，已求找到谁占用了大量带宽。

于是查了下，发现python 有个telnetlib的库，登陆交换机以及进行简单的操作相当简单，于是就写了这么个小工具：

*************************************工作原理********************************************

1、本程序采用telnet的方式登陆到交换机并通过不停的发送display interface [接口] 的方式请求交换机接口
信息并从中提取total input 和 total output的方式计算当前端口速率。

2、本程序仅统计状态为UP的端口的信息。使用display brief interface获取到状态为UP的接口。

3、本程序仅统计gigabytes端口。

*************************************其他**********************************************

1、第一次统计信息，由于没有时间，信息不准确
2、速度的单位都是MB
3、统计结果只能作为参考，并不能代表速率。
4、由于交换机本身更新接口信息速度并不快，而且telnet发送命令回传耗时也较大，本程序设置最小刷新时间，
当前为5s，若由于请求交换机接口所耗时超过5s，则刷新时间为请求耗时时间。

#!/usr/bin/python

import re
import telnetlib
import time
import platform
import os

Host = ‘.....‘
username = ‘‘
password = ‘‘
finish = ‘<....>‘
MIN_INTERVAL = 5.0   # use float
PORT_COUNT = 52      # h3c s5500 has 52 gigabyte ports

# return system type as a string
def get_system_info():
	sys_platform = platform.system()
	if sys_platform == ‘Linux‘ or sys_platform == ‘Darwin‘:
		return ‘UNIX‘
	elif sys_platform == ‘Windows‘:
		return ‘WINDOWS‘
	else:
		return ‘UNIX‘

def clear_screen():
	sys_type = get_system_info()
	if sys_type == ‘UNIX‘:
		os.system("clear")
	elif sys_type == ‘WINDOWS‘:
		os.system(‘cls‘)
	else:
		os.system(‘clear‘)

# login to the device and return the Telnet object
def login():
	# telnet to the device
	print ‘connect...‘
	tn = telnetlib.Telnet(Host,timeout = 5)
	tn.read_until(‘Username:‘,timeout=5)
	tn.write(username + ‘\n‘)

	tn.read_until(‘Password:‘)
	tn.write(password + ‘\n‘)
	tn.read_until(finish)
	print ‘telnet success‘
	return tn

#‘‘‘using Telnet object to get port status and return a tuple filled with ‘UP‘ ports‘‘‘
def get_up_ports(tn):
	example = ‘‘‘
	The brief information of interface(s) under bridge mode:
	Interface            Link      Speed        Duplex   Link-type  PVID
	GE1/0/1              UP        100M(a)      full(a)  access     409
	GE1/0/2              UP        100M(a)      full(a)  access     409
	GE1/0/3              DOWN      auto         auto     access     409‘‘‘

	tn.write(‘display brief interface\n‘)
	tn.write(‘ ‘)
	tn.write(‘ ‘)
	ports_brief = tn.read_until(finish)

	up_ports = []
	port_info	= re.findall(r"GE1/0/(\d+)(\s+)(\w+)",ports_brief)
	for i in port_info:
		if i[-1] == ‘UP‘:
			up_ports.append(i[0])
	print up_ports
	return tuple(up_ports)

def extract_data(port_str):
	‘‘‘ get the data from the result of command ‘display interface GigabitEthernet 1/0/i‘
	‘‘‘

	# (VLAN_ID, total_input, total_output, max_input, max_output)

	if re.search(‘GigabitEthernet‘, port_str) == None:
		return None

	VLAN_ID_list 		= re.findall(r"PVID: (\d+)",port_str)
	input_total_list 	= re.findall(r"Input \(total\):  (\d+) packets, (\d+) bytes", port_str)
	output_total_list 	= re.findall(r"Output \(total\): (\d+) packets, (\d+) bytes", port_str)
	peak_input_list 	= re.findall(r"Peak value of input: (\d+) bytes/sec,", port_str);
	peak_output_list	= re.findall(r"Peak value of output: (\d+) bytes/sec,", port_str);
	state_list			= re.findall(r"current state: (.+)",port_str)

	VLAN_ID = VLAN_ID_list[0] 										# string
	input_total 	= long((list(input_total_list[0]))[1])			# long
	output_total	= long((list(output_total_list[0]))[1])			# long
	peak_input 		= long(peak_input_list[0])						# long
	peak_output 	= long(peak_output_list[0])						# long
	state 			= str(state_list[0])							# string

	return (VLAN_ID, input_total, output_total, peak_input, peak_output, state)

def do_statistic():

	last_input = [0] * PORT_COUNT
	last_output = [0] * PORT_COUNT
	last_update = time.time()

	tn = login()
	up_ports = get_up_ports(tn)

	clear_screen()
	print ‘connected, waiting...‘

	while(True):

		ports_str = []

		# h3c s5500 g1/0/1 - g1/0/52
		# input command to get output
		for i in up_ports:
			tn.write(‘display interface GigabitEthernet 1/0/‘ + str(i) +‘\n‘)
			tn.write(‘ ‘)
			port_info = tn.read_until(finish)
			ports_str.append(port_info)

		# get interval
		interval = (time.time() - last_update)
		if interval < MIN_INTERVAL:
			time.sleep(MIN_INTERVAL - interval)
			interval = MIN_INTERVAL

		# get data and print
		clear_screen()
		print "the input/output is from the port view of the switch."
		print "From the user‘s view: input <-> download; output <-> upload."
		print "the VLAN 1000 is connected to the firewall. So, it‘s opposite\n\n"
		print ‘PORT_NO\tVLAN_ID\tINPUT\tOUTPUT\tMAX_IN\tMAX_OUT\tSTATE (MB)‘

		port_index = 0
		for _port_str in ports_str:
			# (VLAN_ID, total_input, total_output, max_input, max_output)
			data = extract_data(_port_str)
			if data == None:
				continue

			port_no  		= up_ports[port_index]
			vlan_id 		= data[0]
			speed_input 	= (data[1] - last_input[port_index]) / (interval * 1024 * 1024)
			speed_output 	= (data[2] - last_output[port_index]) / (interval * 1024 * 1024)
			max_input 		= data[3] / (1024 * 1024 )
			max_output 		= data[4] / (1024 * 1024 )
			state 			= data[5]

			last_input[port_index] 		= data[1]
			last_output[port_index] 	= data[2]
			port_index += 1

			# show
			print port_no, ‘\t‘, vlan_id, ‘\t‘,float(‘%.2f‘ %speed_input), ‘\t‘, float(‘%.2f‘ %speed_output), ‘\t‘,
			print float(‘%.2f‘ %max_input), ‘\t‘ ,float(‘%.2f‘ %max_output), ‘\t‘, state

		last_update = time.time()

if __name__ == "__main__":
	username = raw_input("please input username:")
	password = raw_input("please input password:")

	print username
	print password
	do_statistic()
	tn.close()

代码未做异常处理，仅实现了简单的流量统计功能。