#!/bin/bash
# 加入计划任务 2分钟执行一次，1分钟太短

DT=`date +%Y-%m-%d`
TIME=`date +%H:%M:%S`
LOG="/tmp/check-eth0-$DT.log"
IP="10.0.0.3"

# /var/log/message
MESSAGE="genet eth0: Link is Up"

# 网卡启动时间
LINKUP=`grep "$MESSAGE" /var/log/messages |tail -n 1 |awk '{print $1,$2,$3}'`
LINKUP_TIMESTAMP=`date -d "$LINKUP" +%s`
NOW_TIMESTAMP=`date +%s`

((DIFFER=$NOW_TIMESTAMP-$LINKUP_TIMESTAMP))


if [ $DIFFER -gt 300 ];then
	echo "$TIME eth0 up more than 5 minutes. ignore" |tee -a $LOG
else
	for id in `seq 1 5`;do
		nmap -sPn $IP
	done |grep "0 hosts up"

	if [ $? -eq 0 ];then
		ifconfig eth0 down
		ifconfig eth0 up
		echo "$TIME found problem. restart eth0..." |tee -a $LOG
	else
		echo "$TIME link ok" |tee -a $LOG
	fi
fi