| # | スクリプト | 解説 | |
|---|---|---|---|
| 1 | #! /bin/bash | # | |
| 2 | echo "$1 are:" | # | |
| 3 | dig $1 | grep "^[^;].*[ \t]*" | while [ 0 ] | # dig の結果のうち有効行(先頭が ; で始まらない物)を抽出 | |
| 4 | do | # while [ 0 ] は無限ループで、(7)までを繰り返す | |
| 5 | read name pri in a addr || break | # dig の抽出結果を変数 name, pri, in, a, addr に格納。終了時にはループを終了 | |
| 6 | dig -x $addr | egrep "^[^;].*in-addr.arpa.*PTR" | # IPアドレスを元に逆引きし、PTR エントリを抽出 | |
| 7 | done |sort +4 | # 逆引き結果をIPアドレス辞書順に並び替え |
$ dig www.yahoo.co.jp ; <<>> DiG 9.2.4 <<>> www.yahoo.co.jp ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30109 ;; flags: qr rd ra; QUERY: 1, ANSWER: 12, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.yahoo.co.jp. IN A ;; ANSWER SECTION: # 以下を最初の grep で抽出 www.yahoo.co.jp. 300 IN A 203.216.247.225 www.yahoo.co.jp. 300 IN A 203.216.247.249 www.yahoo.co.jp. 300 IN A 124.83.139.191 www.yahoo.co.jp. 300 IN A 124.83.147.202 www.yahoo.co.jp. 300 IN A 124.83.147.203 www.yahoo.co.jp. 300 IN A 124.83.147.204 www.yahoo.co.jp. 300 IN A 124.83.147.205 www.yahoo.co.jp. 300 IN A 124.83.167.212 www.yahoo.co.jp. 300 IN A 203.216.231.160 www.yahoo.co.jp. 300 IN A 203.216.235.154 www.yahoo.co.jp. 300 IN A 203.216.235.201 www.yahoo.co.jp. 300 IN A 203.216.243.218 ;; Query time: 4 msec ;; SERVER: 172.19.0.1#53(172.19.0.1) ;; WHEN: Sun Nov 25 12:34:30 2007 ;; MSG SIZE rcvd: 225 $ digx www.yahoo.co.jp www.yahoo.co.jp are: 191.139.83.124.in-addr.arpa. 900 IN PTR f2.top.vip.ogk.yahoo.co.jp. 160.231.216.203.in-addr.arpa. 900 IN PTR f2.top.vip.tnz.yahoo.co.jp. 205.147.83.124.in-addr.arpa. 900 IN PTR f3.top.vip.ogk.yahoo.co.jp. 201.235.216.203.in-addr.arpa. 900 IN PTR f3.top.vip.tnz.yahoo.co.jp. 204.147.83.124.in-addr.arpa. 900 IN PTR f4.top.vip.ogk.yahoo.co.jp. 218.243.216.203.in-addr.arpa. 900 IN PTR f4.top.vip.tnz.yahoo.co.jp. 203.147.83.124.in-addr.arpa. 900 IN PTR f5.top.vip.ogk.yahoo.co.jp. 249.247.216.203.in-addr.arpa. 900 IN PTR f5.top.vip.tnz.yahoo.co.jp. 202.147.83.124.in-addr.arpa. 900 IN PTR f6.top.vip.ogk.yahoo.co.jp. 225.247.216.203.in-addr.arpa. 900 IN PTR f6.top.vip.tnz.yahoo.co.jp. 212.167.83.124.in-addr.arpa. 900 IN PTR f7.top.vip.ogk.yahoo.co.jp. 154.235.216.203.in-addr.arpa. 900 IN PTR f7.top.vip.tnz.yahoo.co.jp.