kresd/exampleについて、ここに記述してください。
$ dig jprs.co.jp @127.0.0.3
実行時のkresd logを見てみる。
> cachectl.clear() true > [plan] plan 'jprs.co.jp.' type 'A' kr_zonecut_find_cached jprscojp kr_zonecut_find_cached cojp kr_zonecut_find_cached jp kr_zonecut_find_cached [resl] ns_fetch_cut ret -2 [resl] zone_cut_check -> ns_fetch_cut = -2 [resl] => using root hints [resl]
root-servers の情報はhintsから得る。
JP NS情報をroot-servers に問い合わせる。
=> querying: '202.12.27.33' score: 10 zone cut: '.' m12n: 'JP.' type: 'NS' [resl] optional: '199.7.83.42' score: 10 zone cut: '.' m12n: 'JP.' type: 'NS' [resl] optional: '193.0.14.129' score: 10 zone cut: '.' m12n: 'JP.' type: 'NS' [resl] optional: '192.58.128.30' score: 10 zone cut: '.' m12n: 'JP.' type: 'NS' [iter] Update zone cut [iter] zonecut_add jp NS adnsjp [iter] <= using glue for 'a.dns.jp.' [iter] Update zone cut jp [iter] zonecut_add jp NS bdnsjp [iter] <= using glue for 'b.dns.jp.' [iter] Update zone cut jp [iter] zonecut_add jp NS cdnsjp [iter] <= using glue for 'c.dns.jp.' [iter] Update zone cut jp [iter] zonecut_add jp NS ddnsjp [iter] <= using glue for 'd.dns.jp.' [iter] Update zone cut jp [iter] zonecut_add jp NS ednsjp [iter] <= using glue for 'e.dns.jp.' [iter] Update zone cut jp [iter] zonecut_add jp NS fdnsjp [iter] <= using glue for 'f.dns.jp.' [iter] Update zone cut jp [iter] zonecut_add jp NS gdnsjp [iter] <= using glue for 'g.dns.jp.' [iter] <= referral response, follow [ rc ] stash referral NS [ rc ] stash auth for jp [ rc ] stash auth for jp [ rc ] stash auth for jp [ rc ] stash auth for jp [ rc ] stash auth for jp [ rc ] stash auth for jp [ rc ] stash auth for jp [ pc ] => pktcache_stash entry [resl] <= server: '199.7.83.42' rtt: 452 ms
JPサーバのNS+glueを保存した。(zone cutの記録)
- co.jp NSを問い合わせる。
[resl] => querying: '203.119.40.1' score: 10 zone cut: 'jp.' m12n: 'Co.Jp.' type: 'NS' [resl] optional: '150.100.6.8' score: 10 zone cut: 'jp.' m12n: 'Co.Jp.' type: 'NS' [resl] optional: '192.50.43.53' score: 10 zone cut: 'jp.' m12n: 'Co.Jp.' type: 'NS' [resl] optional: '210.138.175.244' score: 10 zone cut: 'jp.' m12n: 'Co.Jp.' type: 'NS' [iter] AA terminate resolution chain [iter] <= rcode: NOERROR [iter] <= found cut, retrying with non-minimized name [ rc ] stash auth answer [ pc ] => pktcache_stash entry [ pc ] => pktcache_stash NXDOMAIN [ pc ] => pktcache_stash answer [ pc ] => answer cached for TTL=900 [resl] <= server: '203.119.40.1' rtt: 15 ms
co.jpはゾーンではないことが分かる。(そのことを記録する）
- ゾーンでない中間名があることが分かったので、qname miniは打ち切り、 JPサーバにjprs.co.jp Aを問い合わせる。
[resl] => querying: '150.100.6.8' score: 10 zone cut: 'jp.' m12n: 'Jprs.CO.jP.' type: 'A' [resl] optional: '192.50.43.53' score: 10 zone cut: 'jp.' m12n: 'Jprs.CO.jP.' type: 'A' [resl] optional: '210.138.175.244' score: 10 zone cut: 'jp.' m12n: 'Jprs.CO.jP.' type: 'A' [resl] optional: '156.154.100.5' score: 10 zone cut: 'jp.' m12n: 'Jprs.CO.jP.' type: 'A' [iter] Update zone cut jp [iter] zonecut_add jprscojp NS ns3jprscojp [iter] <= using glue for 'ns3.jprs.co.jp.' [iter] Update zone cut jprscojp [iter] zonecut_add jprscojp NS ns1jprscojp [iter] <= using glue for 'ns1.jprs.co.jp.' [iter] Update zone cut jprscojp [iter] zonecut_add jprscojp NS ns2jprscojp [iter] <= using glue for 'ns2.jprs.co.jp.' [iter] <= referral response, follow [ rc ] stash referral NS [ rc ] stash auth for jprscojp [ rc ] stash auth for jprscojp [ rc ] stash auth for jprscojp [ pc ] => pktcache_stash entry [resl] <= server: '150.100.6.8' rtt: 7 ms
委譲/委任が返ってくるので、glueとともに記録する。
jprs.co.jp NSにAを問い合わせる。
[resl] => querying: '61.200.83.204' score: 10 zone cut: 'jprs.co.jp.' m12n: 'jPrS.CO.JP.' type: 'A' [resl] optional: '202.11.16.59' score: 10 zone cut: 'jprs.co.jp.' m12n: 'jPrS.CO.JP.' type: 'A' [resl] optional: '202.11.16.49' score: 10 zone cut: 'jprs.co.jp.' m12n: 'jPrS.CO.JP.' type: 'A' [iter] AA terminate resolution chain [iter] <= rcode: NOERROR [ rc ] stash auth answer [ pc ] => pktcache_stash entry [resl] <= server: '61.200.83.204' rtt: 16 ms [resl] finished: 4, queries: 1, mempool: 16400 B
Aレコード返答をもらって、これで目的は達成。
-- ToshinoriMaeno 2016-04-24 08:07:20
毒が入っていそうな返答に気づいただろうか。