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net/dns/publicdns: permit more NextDNS profile bits in its IPv6 suffix

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I brain-o'ed the math earlier. The NextDNS prefix is /32 (actually
/33, but will guarantee last bit is 0), so we have 128-32 = 96 bits
(12 bytes) of config/profile ID that we can extract. NextDNS doesn't
currently use all those, but might.

Updates #2452

Change-Id: I249bd28500c781e45425fd00fd3f46893ae226a2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-09-28 17:19:30 -07:00
committed by Brad Fitzpatrick
parent c581ce7b00
commit bb7be74756
2 changed files with 18 additions and 5 deletions
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13
net/dns/publicdns/publicdns_test.go
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@@ -86,6 +86,19 @@ func TestDoHIPsOfBase(t *testing.T) {
"2a07:a8c1::c3:a884",
),
},
{
base: "https://dns.nextdns.io/112233445566778899aabbcc",
want: ips(
"45.90.28.0",
"45.90.30.0",
"2a07:a8c0:1122:3344:5566:7788:99aa:bbcc",
"2a07:a8c1:1122:3344:5566:7788:99aa:bbcc",
),
},
{
base: "https://dns.nextdns.io/112233445566778899aabbccdd",
want: ips(), // nothing; profile length is over 12 bytes
},
{
base: "https://dns.nextdns.io/c3a884/with/more/stuff",
want: ips(