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网络分析shell脚本(修正版)

#!/bin/bash

#write by zhumaohai(admin#centos.bz)
#author blog: www.centos.bz

#显示菜单(单选)
display_menu(){
local soft=$1
local prompt=”which ${soft} you’d select: ”
eval local arr=(\${${soft}_arr[@]})
while true
do
echo -e “#################### ${soft} setting ####################\n\n”
for ((i=1;i<=${#arr[@]};i++ )); do echo -e “$i) ${arr[$i-1]}”; done
echo
read -p “${prompt}” $soft
eval local select=\$$soft
if [ “$select” == “” ] || [ “${arr[$soft-1]}” == “” ];then
prompt=”input errors,please input a number: ”
else
eval $soft=${arr[$soft-1]}
eval echo “your selection: \$$soft”
break
fi
done
}

#把带宽bit单位转换为人类可读单位
bit_to_human_readable(){
#input bit value
local trafficValue=$1

if [[ ${trafficValue%.*} -gt 922 ]];then
#conv to Kb
trafficValue=`awk -v value=$trafficValue ‘BEGIN{printf “%0.1f”,value/1024}’`
if [[ ${trafficValue%.*} -gt 922 ]];then
#conv to Mb
trafficValue=`awk -v value=$trafficValue ‘BEGIN{printf “%0.1f”,value/1024}’`
echo “${trafficValue}Mb”
else
echo “${trafficValue}Kb”
fi
else
echo “${trafficValue}b”
fi
}

#判断包管理工具
check_package_manager(){
local manager=$1
local systemPackage=”
if cat /etc/issue | grep -q -E -i “ubuntu|debian”;then
systemPackage=’apt’
elif cat /etc/issue | grep -q -E -i “centos|red hat|redhat”;then
systemPackage=’yum’
elif cat /proc/version | grep -q -E -i “ubuntu|debian”;then
systemPackage=’apt’
elif cat /proc/version | grep -q -E -i “centos|red hat|redhat”;then
systemPackage=’yum’
else
echo “unkonw”
fi

if [ “$manager” == “$systemPackage” ];then
return 0
else
return 1
fi
}

#实时流量
realTimeTraffic(){
local eth=””
local nic_arr=(`ifconfig | grep -E -o “^[a-z0-9]+” | grep -v “lo” | uniq`)
local nicLen=${#nic_arr[@]}
if [[ $nicLen -eq 0 ]]; then
echo “sorry,I can not detect any network device,please report this issue to author.”
exit 1
elif [[ $nicLen -eq 1 ]]; then
eth=$nic_arr
else
display_menu nic
eth=$nic
fi

local clear=true
local eth_in_peak=0
local eth_out_peak=0
local eth_in=0
local eth_out=0

while true;do
#移动光标到0:0位置
printf “\033[0;0H”
#清屏并打印Now Peak
[[ $clear == true ]] && printf “\033[2J” && echo “$eth——–Now——–Peak———–”
traffic_be=(`awk -v eth=$eth -F'[: ]+’ ‘{if ($0 ~eth){print $3,$11}}’ /proc/net/dev`)
sleep 2
traffic_af=(`awk -v eth=$eth -F'[: ]+’ ‘{if ($0 ~eth){print $3,$11}}’ /proc/net/dev`)
#计算速率
eth_in=$(( (${traffic_af[0]}-${traffic_be[0]})*8/2 ))
eth_out=$(( (${traffic_af[1]}-${traffic_be[1]})*8/2 ))
#计算流量峰值
[[ $eth_in -gt $eth_in_peak ]] && eth_in_peak=$eth_in
[[ $eth_out -gt $eth_out_peak ]] && eth_out_peak=$eth_out
#移动光标到2:1
printf “\033[2;1H”
#清除当前行
printf “\033[K”
printf “%-20s %-20s\n” “Receive: $(bit_to_human_readable $eth_in)” “$(bit_to_human_readable $eth_in_peak)”
#清除当前行
printf “\033[K”
printf “%-20s %-20s\n” “Transmit: $(bit_to_human_readable $eth_out)” “$(bit_to_human_readable $eth_out_peak)”
[[ $clear == true ]] && clear=false
done
}

#流量和连接概览
trafficAndConnectionOverview(){
if ! which tcpdump > /dev/null;then
echo “tcpdump not found,going to install it.”
if check_package_manager apt;then
apt-get -y install tcpdump
elif check_package_manager yum;then
yum -y install tcpdump
fi
fi

local reg=””
local eth=””
local nic_arr=(`ifconfig | grep -E -o “^[a-z0-9]+” | grep -v “lo” | uniq`)
local nicLen=${#nic_arr[@]}
if [[ $nicLen -eq 0 ]]; then
echo “sorry,I can not detect any network device,please report this issue to author.”
exit 1
elif [[ $nicLen -eq 1 ]]; then
eth=$nic_arr
else
display_menu nic
eth=$nic
fi

echo “please wait for 10s to generate network data…”
echo
#当前流量值
local traffic_be=(`awk -v eth=$eth -F'[: ]+’ ‘{if ($0 ~eth){print $3,$11}}’ /proc/net/dev`)
#tcpdump监听网络
tcpdump -v -i $eth -tnn > /tmp/tcpdump_temp 2>&1 &
sleep 10
clear
kill `ps aux | grep tcpdump | grep -v grep | awk ‘{print $2}’`
#处理tcpdump文件
awk ‘/^IP/{print;getline;print}’ /tmp/tcpdump_temp > /tmp/tcpdump_temp2
awk ‘{len=$NF;sub(/\)/,””,len);getline;print $0,len}’ /tmp/tcpdump_temp2 > /tmp/tcpdump
#10s后流量值
local traffic_af=(`awk -v eth=$eth -F'[: ]+’ ‘{if ($0 ~eth){print $3,$11}}’ /proc/net/dev`)
#打印10s平均速率
local eth_in=$(( (${traffic_af[0]}-${traffic_be[0]})*8/10 ))
local eth_out=$(( (${traffic_af[1]}-${traffic_be[1]})*8/10 ))
echo -e “\033[32mnetwork device $eth average traffic in 10s: \033[0m”
echo “$eth Receive: $(bit_to_human_readable $eth_in)/s”
echo “$eth Transmit: $(bit_to_human_readable $eth_out)/s”
echo
#统计每个端口在10s内的平均流量
regTcpdump=$(ifconfig | grep -A 1 $eth | awk -F'[: ]+’ ‘$0~/inet addr:/{printf $4″|”}’ | sed -e ‘s/|$//’ -e ‘s/^/(/’ -e ‘s/$/)\\\\\.[0-9]+:/’)
echo -e “\033[32maverage traffic in 10s base on server port: \033[0m”
awk -F'[ .:]+’ -v regTcpdump=$regTcpdump ‘{if ($0 ~ regTcpdump){line=”clients > “$8″.”$9″.”$10″.”$11″:”$12}else{line=$2″.”$3″.”$4″.”$5″:”$6″ > clients”};sum[line]+=$NF*8/10}END{for (line in sum){printf “%s %d\n”,line,sum[line]}}’ /tmp/tcpdump | \
sort -k 4 -nr | head -n 10 | while read a b c d;do
echo “$a $b $c $(bit_to_human_readable $d)/s”
done
echo
echo -e “\033[32maverage traffic in 10s base on client port: \033[0m”
awk -F'[ .:]+’ -v regTcpdump=$regTcpdump ‘{if ($0 ~ regTcpdump){line=$2″.”$3″.”$4″.”$5″:”$6″ > server”}else{line=”server > “$8″.”$9″.”$10”.”$11″:”$12};sum[line]+=$NF*8/10}END{for (line in sum){printf “%s %d\n”,line,sum[line]}}’ /tmp/tcpdump | \
sort -k 4 -nr | head -n 10 | while read a b c d;do
echo “$a $b $c $(bit_to_human_readable $d)/s”
done

echo
#统计在10s内占用带宽最大的前10个ip
echo -e “\033[32mtop 10 ip average traffic in 10s : \033[0m”
awk -F'[ .:]+’ -v regTcpdump=$regTcpdump ‘{if ($0 ~ regTcpdump){line=$2″.”$3″.”$4″.”$5″ > “$8″.”$9″.”$10″.”$11″:”$12}else{line=$2″.”$3″.”$4”.”$5″:”$6″ > “$8″.”$9″.”$10”.”$11};sum[line]+=$NF*8/10}END{for (line in sum){printf “%s %d\n”,line,sum[line]}}’ /tmp/tcpdump | \
sort -k 4 -nr | head -n 10 | while read a b c d;do
echo “$a $b $c $(bit_to_human_readable $d)/s”
done
echo
#统计连接状态
regSS=$(ifconfig | grep -A 1 $eth | awk -F'[: ]+’ ‘$0~/inet addr:/{printf $4″|”}’ | sed -e ‘s/|$//’)
ss -an | grep -v -E “LISTEN|UNCONN” | grep -E “$regSS” > /tmp/ss
echo -e “\033[32mconnection state count: \033[0m”
awk ‘NR>1{sum[$(NF-4)]+=1}END{for (state in sum){print state,sum[state]}}’ /tmp/ss | sort -k 2 -nr
echo
#统计各端口连接状态
echo -e “\033[32mconnection state count by port: \033[0m”
awk ‘NR>1{sum[$(NF-4),$(NF-1)]+=1}END{for (key in sum){split(key,subkey,SUBSEP);print subkey[1],subkey[2],sum[subkey[1],subkey[2]]}}’ /tmp/ss | sort -k 3 -nr | head -n 10
echo
#统计端口为80且状态为ESTAB连接数最多的前10个IP
echo -e “\033[32mtop 10 ip ESTAB state count at port 80: \033[0m”
cat /tmp/ss | grep ESTAB | awk -F'[: ]+’ ‘{sum[$(NF-2)]+=1}END{for (ip in sum){print ip,sum[ip]}}’ | sort -k 2 -nr | head -n 10
echo
#统计端口为80且状态为SYN-RECV连接数最多的前10个IP
echo -e “\033[32mtop 10 ip SYN-RECV state count at port 80: \033[0m”
cat /tmp/ss | grep -E “$regSS” | grep SYN-RECV | awk -F'[: ]+’ ‘{sum[$(NF-2)]+=1}END{for (ip in sum){print ip,sum[ip]}}’ | sort -k 2 -nr | head -n 10
}

main(){
while true; do
echo -e “1) real time traffic.\n2) traffic and connection overview.\n”
read -p “please input your select(ie 1): ” select
case $select in
1) realTimeTraffic;break;;
2) trafficAndConnectionOverview;break;;
*) echo “input error,please input a number.”;;
esac
done
}

main