1. DNS/実装/python/dnslib/example/client

ソース: https://github.com/paulc/dnslib/blob/master/dnslib/client.py

• /実行例 /mini

tmaeno@skr:~/dnslib-master/dnslib$ python3 client.py --help

usage: client.py [-h] [--server <address:port>] [--query] [--hex] [--tcp]
                 [--noretry] [--diff DIFF] [--dig] [--short] [--dnssec]
                 [--debug]
                 <domain> [<type>]

DNS Client

positional arguments:
  <domain>              Query domain
  <type>                Query type (default: A)

optional arguments:
  -h, --help            show this help message and exit
  --server <address:port>, -s <address:port>
                        Server address:port (default:8.8.8.8:53) (port is
                        optional)
  --query               Show query (default: False)
  --hex                 Dump packet in hex (default: False)
  --tcp                 Use TCP (default: UDP)
  --noretry             Don't retry query using TCP if truncated (default:
                        false)
  --diff DIFF           Compare response from alternate nameserver (format:
                        address:port / default: false)
  --dig                 Compare result with DiG - if ---diff also specified
                        use alternative nameserver for DiG request (default:
                        false)
  --short               Short output - rdata only (default: false)
  --dnssec              Set DNSSEC (DO/AD) flags in query (default: false)
  --debug               Drop into CLI after request (default: false)

tmaeno@skr:~/dnslib-master/dnslib$ python3 client.py qmail.jp A

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55565
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;qmail.jp.                      IN      A
;; ANSWER SECTION:
qmail.jp.               21599   IN      A       127.0.0.128

tmaeno@skr:~/dnslib-master/dnslib$ python3 client.py qmail.jp NS
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64087
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;qmail.jp.                      IN      NS
;; ANSWER SECTION:
qmail.jp.               21599   IN      NS      b.ns.qmail.jp.
qmail.jp.               21599   IN      NS      14.192.44.5.