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net/dns/publicdns: Add Mullvad DoH

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See https://mullvad.net/en/help/dns-over-https-and-dns-over-tls/

The Mullvad DoH servers appear to only speak HTTP/2 and
the use of a non-nil DialContext in the http.Transport
means that ForceAttemptHTTP2 must be set to true to be
able to use them.

Signed-off-by: Nahum Shalman <nahamu@gmail.com>
This commit is contained in:
Nahum Shalman 2022-08-23 01:53:03 +00:00 committed by Brad Fitzpatrick
parent 531ccca648
commit 214242ff62
2 changed files with 11 additions and 0 deletions
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10
net/dns/publicdns/publicdns.go
View File

@ -95,4 +95,14 @@ func populate() {
addDoH("149.112.112.10", "https://dns10.quad9.net/dns-query")
addDoH("2620:fe::10", "https://dns10.quad9.net/dns-query")
addDoH("2620:fe::fe:10", "https://dns10.quad9.net/dns-query")
// Mullvad
addDoH("194.242.2.2", "https://doh.mullvad.net/dns-query")
addDoH("193.19.108.2", "https://doh.mullvad.net/dns-query")
addDoH("2a07:e340::2", "https://doh.mullvad.net/dns-query")
// Mullvad -Ads
addDoH("194.242.2.3", "https://adblock.doh.mullvad.net/dns-query")
addDoH("193.19.108.3", "https://adblock.doh.mullvad.net/dns-query")
addDoH("2a07:e340::3", "https://adblock.doh.mullvad.net/dns-query")
}

1
net/dns/resolver/forwarder.go
View File

@ -406,6 +406,7 @@ func (f *forwarder) getKnownDoHClientForProvider(urlBase string) (c *http.Client
})
c = &http.Client{
Transport: &http.Transport{
ForceAttemptHTTP2: true,
IdleConnTimeout: dohTransportTimeout,
DialContext: func(ctx context.Context, netw, addr string) (net.Conn, error) {
if !strings.HasPrefix(netw, "tcp") {