nagios监控网卡流量

/proc/net/dev文件记录了网卡的进出数据，通过sleep一秒，将前后的两次数据相减得出流量，脚本如下

#!/usr/bin/env python# _*_coding:utf-8_*_"""check interface traffic"""# $Id$#__author__ = 'warshipJian'__version__ = '$Revision: 0.1 $'import sysimport mathimport timeimport fcntlimport structimport socketdef convertbytes(data):    return int(data) / math.pow(1024, 1)def ifconfig_bytes():    traffic_in = dict()    traffic_out = dict()    with open('/proc/net/dev') as f:        for val in f:            if 'lo' in val:                continue            if ':' not in val:                continue            _val = val.split(':')            try:                ifname = _val[0].strip(':').strip()                netdata = _val[1].strip(':').strip().split()                if(len(netdata)) < 8:                    continue                if_in = netdata[0]                if_out = netdata[8]            except ValueError:                continue            traffic_in[ifname] = int(if_in)            traffic_out[ifname] = int(if_out)    return traffic_in, traffic_outdef get_ip_address(ifname):    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)    try:        return socket.inet_ntoa(fcntl.ioctl(        s.fileno(),        0x8915,  # SIOCGIFADDR        struct.pack('256s', ifname[:15])        )[20:24])    except IOError:        return Nonedef ip_type(ip):    f = struct.unpack('!I', socket.inet_pton(socket.AF_INET, ip))[0]    private = (        [2130706432, 4278190080],  # 127.0.0.0,   255.0.0.0   http://tools.ietf.org/html/rfc3330        [3232235520, 4294901760],  # 192.168.0.0, 255.255.0.0 http://tools.ietf.org/html/rfc1918        [2886729728, 4293918720],  # 172.16.0.0,  255.240.0.0 http://tools.ietf.org/html/rfc1918        [167772160, 4278190080],  # 10.0.0.0,    255.0.0.0   http://tools.ietf.org/html/rfc1918    )    for net in private:        if (f & net[1]) == net[0]:            return True    return Falsedef main():    info = list()    label = list()    status = 0    if_in, if_out = ifconfig_bytes()    time.sleep(1)    _if_in, _if_out = ifconfig_bytes()    for val in if_in:        ip = get_ip_address(val)        if ip == None:            continue        receive = convertbytes(_if_in[val] - if_in[val])        transmit = convertbytes(_if_out[val] - if_out[val])        ptf = '%s receive:%.2fkB/s,transmit:%.2fkB/s' % (val, receive, transmit)        labe = '%s_receive=%.2f;0;100 %s_transmit=%.2f;0;100' % (val, receive, val, transmit)        info.append(ptf)        label.append(labe)        if(ip_type(ip)):            if receive >= 50000 or transmit >= 50000:                status = 2            elif receive >= 30000 or transmit >= 30000:                status = 1        else:            if receive >= 5000 or transmit >= 5000:                status = 2            elif receive >= 3000 or transmit >= 3000:                status = 1    print ' '.join(info) + '|' + ' '.join(label)    sys.exit(status)if __name__ == '__main__':    main()