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net/dns/publicdns: support NextDNS DoH URLs with path parameters

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Updates #2452

Change-Id: I0f1c34cc1672e87e7efd0adfe4088724dd0de3ed
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-09-09 14:06:06 -07:00
committed by Brad Fitzpatrick
parent b302742137
commit c14361e70e
2 changed files with 13 additions and 0 deletions
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4
net/dns/publicdns/publicdns.go
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@@ -80,6 +80,10 @@ func DoHIPsOfBase(dohBase string) []netip.Addr {
return s
}
if hexStr, ok := strs.CutPrefix(dohBase, "https://dns.nextdns.io/"); ok {
// The path is of the form /<profile-hex>[/<hostname>/<model>/<device id>...]
// but only the <profile-hex> is required. Ignore the rest:
hexStr, _, _ = strings.Cut(hexStr, "/") // discard any optional
// TODO(bradfitz): using the NextDNS anycast addresses works but is not
// ideal. Some of their regions have better latency via a non-anycast IP
// which we could get by first resolving A/AAAA "dns.nextdns.io" over