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ice-age/cn-route.sh

Created October 29, 2014 07:20
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生成路由添加批处理文件。国内路由直接走本地，不走vpn
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cn-route.sh
#!/bin/bash
wget http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest -O apnic-ip
echo "@echo off" >cn_route_via_local.bat
cat apnic-ip |grep "^apnic"|grep ipv4|grep CN|awk -F'|' '{print $4,$5}'|while read ip count
do
echo $ip,$count
count=`expr $count - 1`
count=`echo "obase=2;$count"|bc|awk '{print length($0)}'`
mask_count=`expr 32 - $count`
echo "route add $ip/$mask_count 172.16.70.1" >>cn_route_via_local.bat
done
echo "pause" >>cn_route_via_local.bat
unix2dos cn_route_via_local.bat
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ice-age commented Oct 29, 2014

根据 ip 个数求掩码可以用 log2(count) 函数

  • python 32 - int(math.log(count,2))
  • awk 'BEGIN { fl=(log(count)/log(2)); print fl }'
  • bc echo 'l(count)/l(2)' | bc -l
  • bc 递归函数
    cat << EOF | bc |tail -1
    pow=32;
    define log2(x) {
    if (x<=1) return (pow);
    pow--;
    return(log2(x/2));
    }
    log2(256) 
    EOF

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