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dnsext's Introduction

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Extensible DNS libraries written purely in Haskell

This is a new series of DNS libraries based on the experience of the dns library in Haskell. The dns library has two flaws:

  • Resource records are not extensible
  • Resource records are not friendly to caching

Resource records are implemented as a sum type. The third party library cannot extend them. The only way to extend them is to send a pull request to the dns library.

Some resource records use ByteString internally. So, if they are cached for a long time, fragmentation happens.

This new library uses typeclasses to extend resource records and uses ShortByteString in them.

bowline, a full resolver server

dnsext-full-resolver provides a server of full resolver, called bowline.

dug, a stub/full resolver command

dnsext-full-resolver also provides dig-like command called dug.

SVBC example: if -d auto is specified, dug obtains the SVCB record first and resolves the target RR via DNS over X:

% dug @1.1.1.1 www.iij.ad.jp --demo -d auto +multi
    query "_dns.resolver.arpa." SVCB to 1.1.1.1#53/UDP
RD_SVCB {
      svcb_priority = 1
    , svcb_target = "one.one.one.one."
    , svcb_params = {
      alpn=["h2","h3"]
    , port=443
    , ipv4hint=[1.1.1.1,1.0.0.1]
    , ipv6hint=[2606:4700:4700::1111,2606:4700:4700::1001]
    , dohpath="/dns-query{?dns}"}}
RD_SVCB {
      svcb_priority = 2
    , svcb_target = "one.one.one.one."
    , svcb_params = {
      alpn=["dot"]
    , port=853
    , ipv4hint=[1.1.1.1,1.0.0.1]
    , ipv6hint=[2606:4700:4700::1111,2606:4700:4700::1001]}}
    query "www.iij.ad.jp." A to 1.1.1.1#443/H2
    query "www.iij.ad.jp." A to 2606:4700:4700::1001#443/H2
    query "www.iij.ad.jp." A to 2606:4700:4700::1111#443/H2
    query "www.iij.ad.jp." A to 1.1.1.1#443/H2: win
;; 1.1.1.1#443/H2, Tx:42bytes, Rx:58bytes, 140usec

;; HEADER SECTION:
;Standard query, NoError, id: 59673
;Flags: Recursion Desired, Recursion Available


;; OPTIONAL PSEUDO SECTION:
;UDP: 1232, Data:[]

;; QUESTION SECTION:
;www.iij.ad.jp.		IN	A

;; ANSWER SECTION:
www.iij.ad.jp.	300(5 mins)	IN	A	202.232.2.180

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

Full resolve example: if -i is specified, dug does iterative queries using the logic of the full resolver.

% dug www.iij.ad.jp --demo -i
root-server addresses for priming: 198.41.0.4 198.97.190.53 199.7.83.42 199.7.91.13
    query "." DNSKEY to 198.41.0.4#53/UDP
    query "." DNSKEY to 198.97.190.53#53/UDP
    query "." DNSKEY to 199.7.83.42#53/UDP
    query "." DNSKEY to 199.7.91.13#53/UDP
    query "." DNSKEY to 198.97.190.53#53/UDP: win
    query "." NS to 198.41.0.4#53/UDP
    query "." NS to 198.97.190.53#53/UDP
    query "." NS to 199.7.83.42#53/UDP
    query "." NS to 199.7.91.13#53/UDP
    query "." NS to 198.97.190.53#53/UDP: win
root-priming: verification success - RRSIG of NS: "."
	"a.root-servers.net." ["198.41.0.4","2001:503:ba3e::2:30"]
	"b.root-servers.net." ["199.9.14.201","2001:500:200::b"]
	"c.root-servers.net." ["192.33.4.12","2001:500:2::c"]
	"d.root-servers.net." ["199.7.91.13","2001:500:2d::d"]
	"e.root-servers.net." ["192.203.230.10","2001:500:a8::e"]
	"f.root-servers.net." ["192.5.5.241","2001:500:2f::f"]
	"g.root-servers.net." ["192.112.36.4","2001:500:12::d0d"]
	"h.root-servers.net." ["198.97.190.53","2001:500:1::53"]
	"i.root-servers.net." ["192.36.148.17","2001:7fe::53"]
	"j.root-servers.net." ["192.58.128.30","2001:503:c27::2:30"]
	"k.root-servers.net." ["193.0.14.129","2001:7fd::1"]
	"l.root-servers.net." ["199.7.83.42","2001:500:9f::42"]
	"m.root-servers.net." ["202.12.27.33","2001:dc3::35"]
zone: ".":
	"a.root-servers.net." ["198.41.0.4","2001:503:ba3e::2:30"]
	"b.root-servers.net." ["199.9.14.201","2001:500:200::b"]
	"c.root-servers.net." ["192.33.4.12","2001:500:2::c"]
	"d.root-servers.net." ["199.7.91.13","2001:500:2d::d"]
	"e.root-servers.net." ["192.203.230.10","2001:500:a8::e"]
	"f.root-servers.net." ["192.5.5.241","2001:500:2f::f"]
	"g.root-servers.net." ["192.112.36.4","2001:500:12::d0d"]
	"h.root-servers.net." ["198.97.190.53","2001:500:1::53"]
	"i.root-servers.net." ["192.36.148.17","2001:7fe::53"]
	"j.root-servers.net." ["192.58.128.30","2001:503:c27::2:30"]
	"k.root-servers.net." ["193.0.14.129","2001:7fd::1"]
	"l.root-servers.net." ["199.7.83.42","2001:500:9f::42"]
	"m.root-servers.net." ["202.12.27.33","2001:dc3::35"]
iterative: query ("jp.",A) servers: 2001:500:a8::e 2001:500:200::b 2001:503:c27::2:30 2001:503:ba3e::2:30
    query "jp." A to 2001:500:a8::e#53/UDP
    query "jp." A to 2001:500:200::b#53/UDP
    query "jp." A to 2001:503:c27::2:30#53/UDP
    query "jp." A to 2001:503:ba3e::2:30#53/UDP
    query "jp." A to 2001:500:a8::e#53/UDP: win
delegation - verification success - RRSIG of DS: "." -> "jp."
	"a.dns.jp." ["203.119.1.1","2001:dc4::1"]
	"b.dns.jp." ["202.12.30.131","2001:dc2::1"]
	"c.dns.jp." ["156.154.100.5","2001:502:ad09::5"]
	"d.dns.jp." ["210.138.175.244","2001:240::53"]
	"e.dns.jp." ["192.50.43.53","2001:200:c000::35"]
	"f.dns.jp." ["150.100.6.8","2001:2f8:0:100::153"]
	"g.dns.jp." ["203.119.40.1"]
	"h.dns.jp." ["161.232.72.25","2a01:8840:1bc::25"]
    query "jp." DNSKEY to 2001:dc4::1#53/UDP
    query "jp." DNSKEY to 2a01:8840:1bc::25#53/UDP
    query "jp." DNSKEY to 150.100.6.8#53/UDP
    query "jp." DNSKEY to 156.154.100.5#53/UDP
    query "jp." DNSKEY to 2001:dc4::1#53/UDP: win
zone: "jp.":
	"a.dns.jp." ["203.119.1.1","2001:dc4::1"]
	"b.dns.jp." ["202.12.30.131","2001:dc2::1"]
	"c.dns.jp." ["156.154.100.5","2001:502:ad09::5"]
	"d.dns.jp." ["210.138.175.244","2001:240::53"]
	"e.dns.jp." ["192.50.43.53","2001:200:c000::35"]
	"f.dns.jp." ["150.100.6.8","2001:2f8:0:100::153"]
	"g.dns.jp." ["203.119.40.1"]
	"h.dns.jp." ["161.232.72.25","2a01:8840:1bc::25"]
iterative: query ("ad.jp.",A) servers: 150.100.6.8 156.154.100.5 161.232.72.25 192.50.43.53
    query "ad.jp." A to 150.100.6.8#53/UDP
    query "ad.jp." A to 156.154.100.5#53/UDP
    query "ad.jp." A to 161.232.72.25#53/UDP
    query "ad.jp." A to 192.50.43.53#53/UDP
    query "ad.jp." A to 192.50.43.53#53/UDP: win
no delegation: "jp." -> "ad.jp."
zone: "jp.":
	"a.dns.jp." ["203.119.1.1","2001:dc4::1"]
	"b.dns.jp." ["202.12.30.131","2001:dc2::1"]
	"c.dns.jp." ["156.154.100.5","2001:502:ad09::5"]
	"d.dns.jp." ["210.138.175.244","2001:240::53"]
	"e.dns.jp." ["192.50.43.53","2001:200:c000::35"]
	"f.dns.jp." ["150.100.6.8","2001:2f8:0:100::153"]
	"g.dns.jp." ["203.119.40.1"]
	"h.dns.jp." ["161.232.72.25","2a01:8840:1bc::25"]
iterative: query ("iij.ad.jp.",A) servers: 2001:502:ad09::5 2001:dc2::1 2001:dc4::1 2a01:8840:1bc::25
    query "iij.ad.jp." A to 2001:502:ad09::5#53/UDP
    query "iij.ad.jp." A to 2001:dc2::1#53/UDP
    query "iij.ad.jp." A to 2001:dc4::1#53/UDP
    query "iij.ad.jp." A to 2a01:8840:1bc::25#53/UDP
    query "iij.ad.jp." A to 2001:dc4::1#53/UDP: win
delegation - verification success - RRSIG of DS: "jp." -> "iij.ad.jp."
	"dns0.iij.ad.jp." ["210.130.0.5","2001:240::105"]
	"dns1.iij.ad.jp." ["210.130.1.5","2001:240::115"]
    query "iij.ad.jp." DNSKEY to 210.130.0.5#53/UDP
    query "iij.ad.jp." DNSKEY to 210.130.1.5#53/UDP
    query "iij.ad.jp." DNSKEY to 2001:240::105#53/UDP
    query "iij.ad.jp." DNSKEY to 2001:240::115#53/UDP
    query "iij.ad.jp." DNSKEY to 2001:240::105#53/UDP: win
zone: "iij.ad.jp.":
	"dns0.iij.ad.jp." ["210.130.0.5","2001:240::105"]
	"dns1.iij.ad.jp." ["210.130.1.5","2001:240::115"]
iterative: query ("www.iij.ad.jp.",A) servers: 210.130.0.5 210.130.1.5 2001:240::105 2001:240::115
    query "www.iij.ad.jp." A to 210.130.0.5#53/UDP
    query "www.iij.ad.jp." A to 210.130.1.5#53/UDP
    query "www.iij.ad.jp." A to 2001:240::105#53/UDP
    query "www.iij.ad.jp." A to 2001:240::115#53/UDP
    query "www.iij.ad.jp." A to 2001:240::105#53/UDP: win
no delegation: "iij.ad.jp." -> "www.iij.ad.jp."
resolve-exact: query ("www.iij.ad.jp.",A) servers: 210.130.0.5 210.130.1.5 2001:240::105 2001:240::115
    query "www.iij.ad.jp." A to 210.130.0.5#53/UDP
    query "www.iij.ad.jp." A to 210.130.1.5#53/UDP
    query "www.iij.ad.jp." A to 2001:240::105#53/UDP
    query "www.iij.ad.jp." A to 2001:240::115#53/UDP
    query "www.iij.ad.jp." A to 210.130.0.5#53/UDP: win
verification success - RRSIG of "www.iij.ad.jp." A
;; 178usec

;; HEADER SECTION:
;Standard query, NoError, id: 0
;Flags: Recursion Desired, Recursion Available


;; QUESTION SECTION:
;www.iij.ad.jp.		IN	A

;; ANSWER SECTION:
www.iij.ad.jp.	300(5 mins)	IN	A	202.232.2.180

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

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