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Brad Fitzpatrick 58abae1f83 net/dns/{publicdns,resolver}: add NextDNS DoH support ... NextDNS is unique in that users create accounts and then get user-specific DNS IPs & DoH URLs. For DoH, the customer ID is in the URL path. For IPv6, the IP address includes the customer ID in the lower bits. For IPv4, there's a fragile "IP linking" mechanism to associate your public IPv4 with an assigned NextDNS IPv4 and that tuple maps to your customer ID. We don't use the IP linking mechanism. Instead, NextDNS is DoH-only. Which means using NextDNS necessarily shunts all DNS traffic through 100.100.100.100 (programming the OS to use 100.100.100.100 as the global resolver) because operating systems can't usually do DoH themselves. Once it's in Tailscale's DoH client, we then connect out to the known NextDNS IPv4/IPv6 anycast addresses. If the control plane sends the client a NextDNS IPv6 address, we then map it to the corresponding NextDNS DoH with the same client ID, and we dial that DoH server using the combination of v4/v6 anycast IPs. Updates #2452 Change-Id: I3439d798d21d5fc9df5a2701839910f5bef85463 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>		2 years ago
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dns	net/dns/{publicdns,resolver}: add NextDNS DoH support	2 years ago
dnscache	net/dnscache: use net/netip	2 years ago
dnsfallback	net/dnsfallback: allow setting log function (#5550)	2 years ago
flowtrack	all: convert more code to use net/netip directly	2 years ago
interfaces	go.mod: bump wireguard/windows, which moves to using net/netip	2 years ago
netaddr	all: migrate code from netaddr.FromStdAddr to Go 1.18	2 years ago
netcheck	net/stun: convert to use net/netip.AddrPort	2 years ago
neterror	net/{neterror,dns/resolver}: move PacketWasTruncated to neterror from DNS code	3 years ago
netknob	all: disable TCP keep-alives on iOS/Android	3 years ago
netns	syncs, all: move to using Go's new atomic types instead of ours	2 years ago
netstat	all: migrate more code code to net/netip directly	2 years ago
nettest	net/nettest: deflake TestPipeTimeout	3 years ago
netutil	all: convert more code to use net/netip directly	2 years ago
packet	all: migrate more code code to net/netip directly	2 years ago
ping	net/netcheck: try ICMP if UDP is blocked (#5056)	2 years ago
portmapper	syncs, all: move to using Go's new atomic types instead of ours	2 years ago
proxymux	net/proxymux: add a listener mux that can run SOCKS and HTTP on a single socket.	3 years ago
socks5	net/socks5: use new Go 1.19 binary.AppendByteOrder.AppendUintX	2 years ago
speedtest	all: fix spelling mistakes	3 years ago
stun	net/stun: convert to use net/netip.AddrPort	2 years ago
tlsdial	all: gofmt for Go 1.19	2 years ago
tsaddr	all: migrate more code code to net/netip directly	2 years ago
tsdial	all: use syncs.AtomicValue	2 years ago
tshttpproxy	all: use syncs.AtomicValue	2 years ago
tstun	all: use syncs.AtomicValue	2 years ago