分析dnsmasq的日志文件

Question

我目前遇到了问题。当我打开 dnsmasq 日志时，它看起来像这样：

Jun 10 17:50:00 dnsmasq[21796]: query[A] isatap.lan from 115.34.22.160
Jun 10 17:50:00 dnsmasq[21796]: cached isatap.lan is NXDOMAIN-IPv4
Jun 10 17:50:21 dnsmasq[21796]: query[A] isatap.lan from 115.34.22.160
Jun 10 17:50:21 dnsmasq[21796]: cached isatap.lan is NXDOMAIN-IPv4
Jun 10 17:50:31 dnsmasq[21796]: query[A] isatap.lan from 115.34.22.160
Jun 10 17:50:31 dnsmasq[21796]: cached isatap.lan is NXDOMAIN-IPv4
Jun 10 17:50:37 dnsmasq[21796]: query[A] isatap.lan from 115.34.22.160
Jun 10 17:50:37 dnsmasq[21796]: cached isatap.lan is NXDOMAIN-IPv4
Jun 10 17:50:40 dnsmasq[21796]: query[A] zyx.qq.com from 115.34.22.160
Jun 10 17:50:40 dnsmasq[21796]: forwarded zyx.qq.com to 114.114.114.114
Jun 10 17:50:40 dnsmasq[21796]: forwarded zyx.qq.com to 223.5.5.5
Jun 10 17:50:40 dnsmasq[21796]: reply zyx.qq.com is 123.151.43.51
Jun 10 17:50:40 dnsmasq[21796]: reply zyx.qq.com is 183.60.62.158
Jun 10 17:50:40 dnsmasq[21796]: reply zyx.qq.com is 113.108.1.90
Jun 10 17:50:42 dnsmasq[21796]: query[A] isatap.lan from 115.34.22.160
Jun 10 17:50:42 dnsmasq[21796]: cached isatap.lan is NXDOMAIN-IPv4
Jun 10 17:50:52 dnsmasq[21796]: query[A] isatap.lan from 115.34.22.160
Jun 10 17:50:52 dnsmasq[21796]: cached isatap.lan is NXDOMAIN-IPv4
Jun 10 17:50:58 dnsmasq[21796]: query[A] ic.wps.cn from 115.34.22.160
AND ETC.

我们很难分析。有人有想法只显示应该像这样的查询域吗？

isatap.lan
zyx.qq.com
ic.wps.cn
AND ETC.

不过我试过这个： http://www.tannerwilliamson.com/analyzing-dnsmasq-log-with-awk/1610/

我喜欢它的输出：

root@VM-208-178-ubuntu:/home# awk -f /home/dnsmasq.awk /var/log/dnsmasq.log | less
                                     name |      nb    |  forwarded |  answered from cache
                                irs01.net |         1  |         1  |         0
 927662-0-2081296634-261190004.ns.124-14-16-250-ns.dns-spider.ffdns.net |         1  |         1  |         0
                         blog.sina.com.cn |         4  |         4  |         1
 927655-0-2081296634-261190004.ns.124-14-16-250-ns.dns-spider.myxns.cn |         1  |         1  |         0
                            www.baidu.com |         2  |         2  |         0
*               careers.whosebug.com |        10  |        13  |         0
                blender.stackexchange.com |         2  |         2  |         0
 974449-0-2081296634-261190004.ns.124-14-16-250-ns.dns-spider.myxns.cn |         1  |         1  |         0
                      img.iknow.bdimg.com |         2  |         1  |         1
*                           smarterer.com |         2  |         3  |         0
                          a.disquscdn.com |         1  |         1  |         0
 927648-0-2081296634-261190004.ns.124-14-16-250-ns.dns-spider.myxns.cn |         1  |         1  |         0
                physics.stackexchange.com |         6  |         5  |         4
*                area51.stackexchange.com |         2  |         3  |         0
                  iknow02.bosstatic.bdimg.com |         2  |         1  |         1
                       passport.baidu.com |         1  |         1  |         0
                    webapps.stackexchange.com |         5  |         4  |         4

这和我想要的有点不同。有人可以帮助我吗？感谢您的帮助！

Answer 1

只要您显示的日志文件保持完整，一个简单的 awk 脚本就足够了。

awk '!seen[]++ {print }' file

将产生

的输出

ic.wps.cn
isatap.lan
zyx.qq.com

逻辑很简单，它解析第 6 列中的每个条目并将其添加到数组中 seen 并仅在之前未见过该元素时打印该元素。

P.S。如果日志文件中列的顺序将来可能发生变化，awk 命令可能无法工作，因为它完全依赖于列的索引来获取结果。

分析dnsmasq的日志文件

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