导读 | 作为一名维护生产环境Linux服务器的系统管理员,在有些情况下,你需要根据地理位置,有选择性地阻止或允许网络流量。那么教你两种屏蔽海外流量的方法。 |
方法一:使用大神的开源脚本,屏蔽指定国家地区的IP访问
wget https://raw.githubusercontent.com/iiiiiii1/Block-IPs-from-countries/master/block-ips.sh sh block-ips.sh
方法二:使用IPIP的数据库进行流量屏蔽(推荐,目前已支持centos6和7还有ubuntu系统)
#!/bin/bash #判断是否具有root权限 root_need() { if [[ $EUID -ne 0 ]]; then echo "Error:This script must be run as root!" 1>&2 exit 1 fi } #检查系统分支及版本(主要是:分支->>版本>>决定命令格式) check_release() { if uname -a | grep el7 ; then release="centos7" elif uname -a | grep el6 ; then release="centos6" yum install ipset -y elif cat /etc/issue |grep -i ubuntu ; then release="ubuntu" apt install ipset -y fi } #安装必要的软件(wget),并下载中国IP网段文件(最后将局域网地址也放进去) get_china_ip() { #安装必要的软件(wget) rpm --help >/dev/null 2>&1 && rpm -qa |grep wget >/dev/null 2>&1 ||yum install -y wget ipset >/dev/null 2>&1 dpkg --help >/dev/null 2>&1 && dpkg -l |grep wget >/dev/null 2>&1 ||apt-get install wget ipset -y >/dev/null 2>&1 #该文件由IPIP维护更新,大约一月一次更新(也可以用我放在国内的存储的版本,2018-9-8日版) [ -f china_ip_list.txt ] && mv china_ip_list.txt china_ip_list.txt.old wget https://github.com/17mon/china_ip_list/blob/master/china_ip_list.txt cat china_ip_list.txt |grep 'js-file-line">' |awk -F'js-file-line">' '{print $2}' |awk -F'< ' '{print $1}' >> china_ip.txt rm -rf china_ip_list.txt #wget https://qiniu.wsfnk.com/china_ip.txt #放行局域网地址 echo "192.168.0.0/18" >> china_ip.txt echo "10.0.0.0/8" >> china_ip.txt echo "172.16.0.0/12" >> china_ip.txt } #只允许国内IP访问 ipset_only_china() { echo "ipset create whitelist-china hash:net hashsize 10000 maxelem 1000000" > /etc/ip-black.sh for i in $( cat china_ip.txt ) do echo "ipset add whitelist-china $i" >> /etc/ip-black.sh done echo "iptables -I INPUT -m set --match-set whitelist-china src -j ACCEPT" >> /etc/ip-black.sh #拒绝非国内和内网地址发起的tcp连接请求(tcp syn 包)(注意,只是屏蔽了入向的tcp syn包,该主机主动访问国外资源不用影响) echo "iptables -A INPUT -p tcp --syn -m connlimit --connlimit-above 0 -j DROP" >> /etc/ip-black.sh #拒绝非国内和内网发起的ping探测(不影响本机ping外部主机) echo "iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j DROP" >> /etc/ip-black.sh #echo "iptables -A INPUT -j DROP" >> /etc/ip-black.sh rm -rf china_ip.txt } run_setup() { chmod +x /etc/rc.local sh /etc/ip-black.sh rm -rf /etc/ip-black.sh #下面这句主要是兼容centos6不能使用"-f"参数 ipset save whitelist-china -f /etc/ipset.conf || ipset save whitelist-china > /etc/ipset.conf [ $release = centos7 ] && echo "ipset restore -f /etc/ipset.conf" >> /etc/rc.local [ $release = centos6 ] && echo "ipset restore < /etc/ipset.conf" >> /etc/rc.local echo "iptables -I INPUT -m set --match-set whitelist-china src -j ACCEPT" >> /etc/rc.local echo "iptables -A INPUT -p tcp --syn -m connlimit --connlimit-above 0 -j DROP" >> /etc/rc.local echo "iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j DROP" >> /etc/rc.local #echo "iptables -A INPUT -j DROP" >> /etc/rc.local } main() { check_release get_china_ip ipset_only_china case "$release" in centos6) run_setup ;; centos7) chmod +x /etc/rc.d/rc.local run_setup ;; ubuntu) sed -i '/exit 0/d' /etc/rc.local run_setup echo "exit 0" >> /etc/rc.local ;; esac } main
原创文章,作者:ItWorker,如若转载,请注明出处:https://blog.ytso.com/tech/linux/120832.html