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VPN自动切换服务器拨号脚本

发布时间：2021-01-10作者：♂逸風★淩軒

#!/bin/bash
limmit="120"
Servers=(a.com  b.com)
ChangeRoute()
{
    #需求注意阿里云出口IP是否变更，现指定为 120.78.204.192
    #echo  "`date "+%Y-%m-%d %H:%M:%S"`成功拨号" >>  /root/logs/l2tp.log
    route  add -host p.3.cn  gw ${L2tpIP}
    route  add -host search.jd.com gw ${L2tpIP}
    route  add -host gd.chinavnet.com gw  ${L2tpIP}
    #route  add -host 119.29.29.29 gw ${L2tpIP}
}

LogCheck()
{
    while true
    do
        Error=$(tail -26 /usr/local/tomcat-proxy/logs/catalina.`date '+%Y-%m-%d'`.out |grep "socket请求超时,重新发送HTTP请求" |wc -l)
        if test $Error -eq 0;then
            echo "VPN服务IP尚未封禁，继续使用ing...."
            sleep 30
        else
            date
            echo "VPN服务IP已被封禁，跳出检测日志，即将更换IP...."
            break
        fi
    done
}

TimeLimit()
{
    if [ "$RemoIP" != "$OldIP" ];then
        echo "VPN服务已链接且IP为新IP修改网关ing...."
        ChangeRoute
        IPServer=($(sed -n '18p' /etc/xl2tpd/xl2tpd.conf  |awk '{print $3}'))
        echo  "`date '+%Y-%m-%d %H:%M:%S'` ${RemoIP} ${IPServer}" >> /root/logs/ip.log
        echo "新IP待机使用20分钟ing...."
        sleep 12000
    else
        start=$(/usr/bin/tail -1 /root/logs/ip.log |awk '{print $1 " " $2}')
        first=$(date -d "$start" +%s)
        end=$(date '+%Y-%m-%d %H:%M:%S')
        last=$(date -d "$end" +%s)
        time=$(( ($last - $first)/60 ))
        echo "时间差$time分钟" 
        if [ "$time" -gt  "$limmit" ];then
                echo "同一IP超出${limmit}分钟未更换需重连代理" >> /root/logs/l2tp.log
                echo 'd ipsec' > /var/run/xl2tpd/l2tp-control
        else
            stime=$((1200-($last - $first)))
            date
            echo "同一IP未超出20分钟可待机继续使用$stime秒"
            sleep $stime
            echo 'd ipsec' > /var/run/xl2tpd/l2tp-control
        fi
    fi
}

LogLimit()
{
    echo "VPN服务已链接且IP为新IP修改网关ing...."
    ChangeRoute
    IPServer=($(sed -n '18p' /etc/xl2tpd/xl2tpd.conf  |awk '{print $3}'))
    echo  "`date '+%Y-%m-%d %H:%M:%S'` ${RemoIP} ${IPServer}" >> /root/logs/ip.log
    LogCheck
}

while true
do
    date
    echo "初始化重新拨号ing...."
    if test $(ps -ef |grep xl2tpd |grep D |wc -l) -eq 0;then
            echo " Xl2tpd服务未启动，重启ing..."
            service xl2tpd restart 
    else
            echo 'c ipsec' > /var/run/xl2tpd/l2tp-control
    fi
    sleep 30
    L2tpIP=($(/sbin/ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v 172.16.64.10|grep -v inet6|awk '{print $2}'))
    RemoIP=($(/usr/bin/curl -s -4 ip.52aiops.cn))
    OldIP=$(/usr/bin/tail -1 /root/logs/ip.log |awk '{print $3}')
    if [ "${L2tpIP}" == "" ]; then
            date
            echo "VPN服务未链接成功更换服务器重新拨号ing...."
            tail -50 /var/log/messages > /root/logs/checkdata.log
            echo  "`date "+%Y-%m-%d %H:%M:%S"`异常拨号" >>  /root/logs/l2tp.log
            IPS=${Servers[$(( $RANDOM % 32 ))]}
            cat > /etc/xl2tpd/xl2tpd.conf<<EOF
[global]
ipsec saref = yes
debug avp = no
debug network = no
debug packet = no
debug state = no
debug tunnel = no
[lns default]
ip range = 10.1.7.2-10.1.7.254
local ip = 10.1.7.1
refuse chap = yes
refuse pap = yes
require authentication = yes
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
[lac ipsec]
lns = $IPS
pppoptfile = /etc/ppp/ipsec.l2tpd
ppp debug = yes
EOF
            service xl2tpd restart
            echo  "更换域名拨号服务器为$IPS"
            echo  "`date '+%Y-%m-%d %H:%M:%S'` 更换域名拨号服务器为$IPS" >>  /root/logs/server.log
            echo "VPN服务未链接重新拨号后发送告警ing...."
            echo  "------------------------------------------" >>  /root/logs/checkdata.log
            echo  "更换域名拨号服务器为$IPS" >>  /root/logs/checkdata.log
            echo  "------------------------------------------" >>  /root/logs/checkdata.log
            tail -50 /var/log/messages >> /root/logs/checkdata.log
            mailx -v  -s "爬虫代理拨号异常"   xxxx@139.com  < /root/logs/checkdata.log
    else
        #TimeLimit
        LogLimit
    fi
done