netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n

DDos-defalte

DDOS defalte是一款免费的用来防御和减轻DDoS攻击。它通过netstat监测跟踪创建大量网络连接的IP地址，在检测到某个结点超过预设的限制时，该程序会通过APF或iptables禁止或阻挡这些IP.

#该版对原版进行了错误修复，而且进行了本地化不需要安装的时候下载文件。

#安装步骤

下载 ddos-defalte.tar.gz

tar zxfv ddos-defalte.tar.gz

cd ddos-defalte

./install.sh

安装完毕。

配置文件位于 /usr/local/ddos/ddos.conf

ip白名单文件位于 /usr/local/ddos/ignore.ip.list ，格式：一行一个ip

配置完毕之后执行命令 ddos 可以看到一行行的输出，每行：第一个是连接数 第二个是对应ip

/usr/local/sbin/ddos命令是脚本/usr/local/ddos/ddos.sh的一个软链接

安装完毕。 然后只需要计划任务周执 ddos 命令即可。ddos每执行一次都会检测配置里面的设置监测系统网络连接情况封ip。

比如root帐号下，执crontab -e 可以这样执行计划任务 */1 * * * * /usr/local/ddos/ddos.sh >/dev/null 2>&1

命令ddos有一些带参数的用法，可以通过ddos -h 了解用法。

配置文件/usr/local/ddos/ddos.conf的一些简要说明：

PROGDIR="/usr/local/ddos"

PROG="/usr/local/ddos/ddos.sh"

IGNORE_IP_LIST="/usr/local/ddos/ignore.ip.list"  #ip的白名单

APF="/etc/apf/apf"

IPT="/sbin/iptables" 

##### How many connections define a bad IP? Indicate that below.

NO_OF_CONNECTIONS=100 #一个ip超过100个连接数,自动封掉 

##### APF_BAN=1 (Make sure your APF version is atleast 0.96)

##### APF_BAN=0 (Uses iptables for banning ips instead of APF)

APF_BAN=0 #这里我使用iptables封ip 

##### KILL=0 (Bad IPs are'nt banned, good for interactive execution of script)

##### KILL=1 (Recommended setting)

KILL=1 

##### An email is sent to the following address when an IP is banned.

##### Blank would suppress sending of mails ,设置为 root 则不发邮件

EMAIL_TO="root"  #封ip,自动发送邮件 

##### Number of seconds the banned ip should remain in blacklist.

BAN_PERIOD=600

import os

import time

def fyddos():

    IGNORE_IP_LIST = "/usr/local/ddos/ignore.ip.list"

    PGOPDIR="/usr/local/ddos/ddos.conf"

    PROG = "/usr/local/ddos/ddos.sh"

    if os.path.exists(PROG):

     print '[+]The execution file exists to continue the program.'

    else:

        print '[-]The execution file does not exist, the closing procedure.'

        exit()

    if os.path.exists(PGOPDIR):

        print '[+]The configuration file exists to start the execution of the program.'

    else:

        print '[-]There is no exit procedure for the configuration file.'

        exit()

    if os.path.exists(IGNORE_IP_LIST):

        print '[+]The IP white list file exists to continue the program.'

    else:

        print '[-]IP white list file does not exist, end the program.'

        exit()

    time.sleep(1)

    print '[+]Start configuring the IP white list.'

    IPlist=raw_input('Please enter your white list IP, and if not, enter q to enter the next step:')

    if IPlist=='q':

        try:

          import dy1

        except Exception , g:

            print '[-]Catch the error cause:',g

        print '[+]It has been added to it.'

        time.sleep(3)

        try:

          import dy2

        except Exception , r:

            print '[-]Catch the error cause:',r

        time.sleep(3)

        try:

            import dy3

        except Exception , p:

            print '[-]Catch the error cause:',p

        print '[+]Query information,Please input: netstat -ntu | awk ''{print $5}'' | cut -d: -f1 | sort | uniq-c | sort -n command view.'

        isd=os.system('ddos')

        sda=os.system('service iptables status')

        print isd

        print sda

    else:

        list=open('/usr/local/ddos/ignore.ip.list','w')

        list.write(IPlist+"\n")

        print '[+]It has been added to it:',IPlist

        time.sleep(3)

        try:

          import dy1

        except Exception , w:

          print('[-]Catch the error cause:',w)

        time.sleep(3)

        try:

            import dy2

        except Exception , d:

            print '[-]Catch the error cause:',d

        time.sleep(3)

        try:

            import dy3

        except Exception ,z:

            print '[-]Catch the error cause:',z

        print '[+]Query information,Please input: netstat -ntu | awk ''{print $5}'' | cut -d: -f1 | sort | uniq-c | sort -n command view.'

        isds = os.system('ddos')

        sdas= os.system('service iptables status')

        print isds

        print sdas

fyddos()

conf=input('Please enter an IP number more than how many connections will be blocked:')

data = ''

with open('/usr/local/ddos/ddos.conf', 'r+') as f:

    for line in f.readlines():

        if (line.find('NO_OF_CONNECTIONS') == 0):

            line = 'NO_OF_CONNECTIONS={}'.format(conf) + '\n'

        data += line

with open('/usr/local/ddos/ddos.conf', 'r+') as f:

    f.writelines(data)

lv=raw_input('Use APF or iptables to seal IP. It is recommended to use iptables to change the value of APF_BAN to 0:')

data=''

with open('/usr/local/ddos/ddos.conf','r+') as f:

    for line in f.readlines():

        if(line.find('APF_BAN')==0):

            line='APF_BAN={}'.format(lv)+'\n'

        data+=line

with open('/usr/local/ddos/ddos.conf','r+') as f:

    f.writelines(data)