[tz] [Tzdist-bis] [calsify] tzdist and IANA -- estimating the operational parameters

[Tony Finch]

Steve Crocker <steve at shinkuro.com> wrote:

> Early in this thread it was mentioned the the time zone database should be
> served in a fashion similar to DNS.

We could just use the DNS :-) As Paul pointed out, TZif files are not
very big.

I have experimentally shoved the zoneinfo files from my workstation into a
DNS zone I happen to have lying around. I've deflated (RFC 1950) each file
(RFC 8536) and picked an arbitrary RR type 29818 = 0x747A = 'tz'. The
result appears below as a hex blob (RFC 3597) which does not quite fit in
the Ethernet MTU, but you can get the answer over UDP if you allow EDNS
with fragmentation. It's signed with DNSSEC so you can be sure I am to
blame. https://pbs.twimg.com/media/DY5rHo_WAAEISGh.jpg


; <<>> DiG 9.15.1 <<>> +dnssec +multiline London.Europe.tz.dotat.at. TYPE29818
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32632
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 1420
; COOKIE: 30e31bd663d426f6eb79a79f5d307ef6114d7eabab9d3c0e (good)
;; QUESTION SECTION:
;London.Europe.tz.dotat.at. IN TYPE29818

;; ANSWER SECTION:
London.Europe.tz.dotat.at. 3412 IN CNAME GB.tz.dotat.at.
London.Europe.tz.dotat.at. 3412 IN RRSIG CNAME 5 5 3600 (
                                20190728110326 20190718100326 56700 dotat.at.
                                R7ynL3bJ7uScgbF3GNSKzuXZZZKnTF6ZKObqh9y5LIwI
                                voZSo46m1jv6HwkQBUDvmMSYzSfW0TDqzxz6BDrxb+VG
                                aBITB2DyJeI6OXcJYQXbyGpqP9Brc7k5B6js1oyFOMru
                                hLDqOxSlZTIW3pimnV17LQqI7ve/FPygHN26+rE= )
GB.tz.dotat.at.         3412 IN TYPE29818 \# 1751 (
				789CEDD67B74CF751CC7F1DF9A61CBE5438CCCE5A3B9
                                34CDFC36914B4BEE8D6DB9FCD22FD208439666691969
                                3995E238CE5B472DA13E2296582E5B2E4BAE0DD19026
                                26B985CDFD9A319B3ECF2F754EC7395DFFEDF73BDBE3
                                B7DF3867E7ECECFD7C79FA0E8F8F70DDF1287FFB83C7
                                A5DBAFABBC663FCD6CB4D8CCDCE3A767ED709BD9F336
                                9A0F67CD361FA5D532E6CDD57A4EF20DF3F190597AEE
                                B82D665EEC4AF349BB623DBFE100BDA0718E4E6F12AA
                                D34F159985AEDD66615E75FD59E179BD6873825EBCF5
                                3B9DB120567F6E52CC92B7DC7AE93B3BCDB2C468B33C
                                6999C9EC1166B2A2FAEA2FDCCAAC8848362B2B5F34AB
                                AA7ACDAA73DF9BD5852E9DBDF782FE72FF937ACDCADD
                                FAABA5A566EDFB597ADDCC20BD7E4C9ADE30B6446FF4
                                A6E84D3DE799AF5BF5D3396DD6EBCDDE3D6673BEBFF9
                                26B0917C93F6946CDB5557B6BFDC56BE5DEA92DC015E
                                B5438EC8CE91CFC8AEA440B5AB38427D37BC54EF1E14
                                62BE8F3AA4F3EAD637791D4A24EFE021B5277691DE53
                                EA6BF6864DD57BAFBDABF32B25EAFC53A7F5FE6335CC
                                8FDB72F5814DD7CC4F9927CDC18C407D68FA767338E9
                                317364C4687DB45713F3B347CCB1880AE678E4627D22
                                28441754F39882E2BB7561C9287D32FF8C3E75A0B73E
                                BD7A873EB3FCBA39FBC1527D6EC25073FEA3F1FAC2C0
                                287331354E5FEA16AF2FC7B5D757EA5734BFB40BD657
                                5DE74C513D3F5D746897B9567A425F5FB7DC1417F89A
                                1BE33E33259BB3137D1373749910AFF6EB91AECBFAB7
                                D1E5DC9375B9C2DADA5F2568FF2DA53AE07CACBE7B59
                                2D5361A75B579C76C3545A5255571EF5935133C24C95
                                9EEB4CD51465EE09FFD854F35E34D5834F4960AB1CA9
                                E1FBADD4AC992E358F7E2EF7164D965A1BA749D0E105
                                AAF6A20C5567FD2455778AA87A7346289D90A4EA4F88
                                51F7457B54F0C066AA41684BD5B05B776954A1A66ADC
                                A4A934BEF2A08404549690BC40695278411EC82C92D0
                                ADBBA5E9F47C09FB344B9A8DFE52DC93D2C47DA2812B
                                BCFF3E159194A99A4766AB077BBDA75AD499AD5A468C
                                512D4B5255ABA0E9D2EAC040D5BA3859DAACE9A8DAEE
                                F7CAC3F3E32432BB8D3C32B1BDB49B595B1E8D0F96F6
                                6FB4561DBAF849C7C141AA53C313D2B96389EAE2B755
                                BA061F545DCF1E5751BEEB5554EE16D5EDE85CD53D63
                                A18ADEBE5662A64E51B18BE6C8E32347AA1E535E979E
                                4F4E965E0943A4F74309E289EE2A4FD488953EA121D2
                                E7AA5BBCD5BB28EF0F55E5A92BF7ABBE5F5C967E7901
                                EA695345F5CF3CAD9E49BDA4E2A6E7AA0171796AE0F8
                                93F26CBB156A50FFED32B8DE0C35243243E2CB67C9D0
                                3A22430BD2645849920CDF9222CF1DF0C888F47E9290
                                334A3DFF76A48C9CDF5BBD30AC9E244E6CA146F57C58
                                25C5D7502F86D755A33B5F532F5571A9E466D525F9FC
                                1135A6D25519B373934A39BB4FC62E99AFC6E566CB2B
                                3336C8F88CD9F26ACA3C499D9A2A77F9FCD3A7EFEFCF
                                5B5FFDFDFF59A6EC9D6FFA95FDB367B93FFFF6BF7BDE
                                BC79338B7B5649F994F9EDC8D5D63E1578C755E68FEF
                                F3393AC6E3EAD0DBE3EA8A9DEC0B978F8F8FFDB87515
                                AD9EBFBE9D977FBB9D45B7DFB03FC4CD5AFDFDB721B7
                                D4D1DE53E4A6227715B9ADC87D456E2C7267915B8BDC
                                5BE4E6227717B9BDC8FD456EB0A3BDC3C82D76B4F718
                                B9C9C85D466E33729F911B8DDC69E45623F71AB9D9C8
                                DD466E3772BF911B8EDC71E4963BDA7B8EDC74E4AE23
                                B71DB9EFC88D47EE3C72EB917B8FDC7CE4EE23B71FB9
                                FF4803900E38DA16203D70B44D40BA80B401E903D208
                                A413482B905E38DA6620DD40DA81F4036988A3ED88A3
                                6D09D21347DB14A42B8EB62D485F1C6D6390CE20AD41
                                7A833407E90ED21EA43F4883900E212D427A843409E9
                                12D22647DB27A45148A7905621BD429A85740B6917D2
                                2FA46148C79096213D439A86740D691BD23747DB38A4
                                7348EB90DE21CD43BAC7DF1AED43FA873410E920D242
                                47DB43A4898EB68B481B913E228D443AE91C12DB4AA4
                                974833916E22ED44FA893414E928D252A4A748531D6D
                                5791B6227D451A8B7416692DD25BA4B9487791F622FD
                                451A8C74186931D263A4C98EB6CB489B1D6D9F914623
                                9D465A8DF41A6936D26DA4DD8EB6DF3C6838D271A4E5
                                48CF91A6235D77B46D47FAEE681B8F741E693DD27BA4
                                F948F791F623FD473600B203902D80EC01641320BB00
                                D906C83E70B41B01D9098E762B207B01D90CC86E40B6
                                03B21F900D81EC08644B207B02D914C8AE40B605B22F
                                1CEDC6407686A3DD1AC8DE403607B23B90ED81EC0F64
                                83203B04D922C81E413609B24B906D82EC1364A3203B
                                C5B1E0D6EF97BD826C1664B720DB05D92FC88641760C
                                B265903D836C1A64D720DB06D937C8C641768EA3DD3A
                                C8DE71B49B07D93DC8F641F60FB281901D846C21640F
                                B9FE1F44FF7D1005D8EFB8EDBF088D691ED622CCDD2C
                                3C3426DCCDAB805F0162E35BFB )
GB.tz.dotat.at.         3412 IN RRSIG TYPE29818 5 4 3600 (
                                20190728110326 20190718100326 56700 dotat.at.
                                JMbEh9MzMHhSIuLF+capNcNEkoa5Q2McgQSBpjS84w4v
                                ROpglw84OgCYunhmI5xmxVgqCUHd4+romQK86xvfit9j
                                4Gs2kHTKOEjcxfvVbxLoUGkjZOe6zBeaT2tXRx/gQnUq
                                +md2j8+NKEbcRi8oL4YdDjdMsmFo5SntpbRd19E= )

;; Query time: 0 msec
;; SERVER: ::1#53(::1)
;; WHEN: Thu Jul 18 15:15:18 BST 2019
;; MSG SIZE  rcvd: 2209

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Fair Isle, East Faeroes: Mainly southerly 4 or 5, increasing 6 at times.
Moderate, occasionally slight. Occasional rain or showers. Moderate or good,
occasionally poor.