python写的一个监控系统进程网络流量的程序

import socket
import struct
import thread
import threading
import time
import os

net_data = {}
d_net_info = {}
lock = threading.Lock()

def print_data():
    while True:
        lock.acquire()
        for key in net_data:
            print "%s %sn"%(key, net_data[key])
        lock.release()
        time.sleep(5);
       
def get_net_info():
    net_info = os.popen('netstat -nbo').readlines()
   
    for l in net_info[4:]:
        s = l.split()
        if len(s)>2:
            key = "%s %s"%(s[1],s[2])
            key2 = "%s %s"%(s[2],s[1])
        else:
            if not d_net_info.has_key(key):
                d_net_info[key] = s[0]
                d_net_info[key2] = s[0]

def get_packet():
    HOST = socket.gethostbyname(socket.gethostname())
    s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_IP)
    s.bind((HOST, 0))
    s.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
    s.ioctl(socket.SIO_RCVALL, socket.RCVALL_ON)
    net_data["unknow"] = 0

    while True:
        buf = s.recvfrom(65565)
        port = struct.unpack('HH', buf[0][20:24])
       
        src_ip = "%d.%d.%d.%d"%struct.unpack('BBBB', buf[0][12:16])
        dest_ip ="%d.%d.%d.%d"%struct.unpack('BBBB', buf[0][16:20])
        src_port = socket.htons(port[0])
        dest_port = socket.htons(port[1])
       
        data_len = len(buf[0])
        key="%s:%d %s:%d"%(src_ip,src_port,dest_ip,dest_port)
        if not d_net_info.has_key(key):
            get_net_info()

        if d_net_info.has_key(key):
            key2 ="%s %s"%(key,d_net_info[key])
            if net_data.has_key(key2):
                net_data[key2] =net_data[key2]+data_len
            else:
                net_data[key2] = data_len
        else:
             net_data["unknow"] =net_data["unknow"] + data_len
       
thread.start_new_thread(print_data,())
get_packet()
os.exit()