dns dig 查看支持ipv6網站

1.處理zone文件
A.先格式化區文件數據，去掉不需要的數據，生成新的文件 com.zone.sample
cat com.zone |grep -P IN'\t'NS|awk -F '\t' '{print $1","$4}' >> com.zone.sample
格式如下：

waiyuren.com.,ns6.ctrlcache.com.
jmtcq.com.,ns5.myhostadmin.net.

B.獲取到所有的ns數據，並且去重，並生成新的文件/home/cnzone/com_sort.zone
cat com.zone |grep -P IN'\t'NS|awk -F '\t' '{print $4}'|sort|uniq >> com_sort.zone
格式如下：

zyd1.dnspod.net.
zyd.dnspod.net.
zz.baidu.com.

C.如果com_sort.zone文件比較大，最好按行分成多分文件，同時運行腳本
詳見：[linux 查看某幾行內容與文件分割] (https://www.cnblogs.com/wt11/p/9351021.html)

2.批量dig ns，獲取支持ipv6的ns

[root@localhost home]# cat dns.py 
import sh
import json

ns = {}
def validation_ipv6(domain):
    ns = {}
    num = 0
    try:
        dig = sh.dig(domain, "AAAA", "+short")
        num = sh.wc(dig, "-l")
        print(domain +'-----------------------'+ str(int(num)))
    except:
        with open('unreachd_domain.txt', 'a+', encoding='utf8') as f2:
            f2.write(domain + '\n')
    if int(num) > 0:
        ns[domain] = int(num)
        #print(ns)
        datas = json.dumps(ns, ensure_ascii=False, indent=4)
        with open('ipv6_ns.txt', 'a+', encoding='utf8', buffering=1) as ff:
            ff.write(datas+',')
def save():
    with open('cn.ns.sort', 'r', encoding='utf8') as f:
        for i in f:
            i = i.strip()
            validation_ipv6(i)

if __name__ == '__main__':
    save()

3.根據對應的ns，獲取支持ipv6的網站

[root@localhost home]# cat get_v6.py 
import json

alls = {}

def ana():
    with open('ipv6_ns.txt', 'r', encoding='utf8') as f:
        data = json.load(f)
        for item in data:
            for key in item:
                alls[key] = item[key]


def gets():
    n = 0
    with open('com.zone.sample', 'r', encoding='utf8') as ff:
        for line in ff:
            line = line.strip()
            key = line.split(',')[1]
            num = alls.get(key, 0)
            print(str(n) + '-------------->'+ line +'------------>' + key + '>>>>>>>' + str(num))
            n = n + 1
            if num > 0:
                with open('support_ipv6_site.txt', 'a+', encoding='utf8') as fc:
                    fc.write(line.split(',')[0] + '\n')

if __name__ == '__main__':
    ana()
    gets()