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appc,ipn/ipnlocal,net/dns/resolver: add App Connector wiring when enabled in prefs

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An EmbeddedAppConnector is added that when configured observes DNS
responses from the PeerAPI. If a response is found matching a configured
domain, routes are advertised when necessary.

The wiring from a configuration in the netmap capmap is not yet done, so
while the connector can be enabled, no domains can yet be added.

Updates tailscale/corp#15437

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2023-10-27 14:20:10 -07:00
committed by James Tucker
parent e7482f0df0
commit b48b7d82d0
9 changed files with 518 additions and 15 deletions
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8
net/dns/resolver/tsdns.go
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@@ -314,9 +314,9 @@ func parseExitNodeQuery(q []byte) *response {
return p.response()
}
// HandleExitNodeDNSQuery handles a DNS query that arrived from a peer
// via the peerapi's DoH server. This is only used when the local
// node is being an exit node.
// HandlePeerDNSQuery handles a DNS query that arrived from a peer
// via the peerapi's DoH server. This is used when the local
// node is being an exit node or an app connector.
//
// The provided allowName callback is whether a DNS query for a name
// (as found by parsing q) is allowed.
@@ -325,7 +325,7 @@ func parseExitNodeQuery(q []byte) *response {
// still result in a response DNS packet (saying there's a failure)
// and a nil error.
// TODO: figure out if we even need an error result.
func (r *Resolver) HandleExitNodeDNSQuery(ctx context.Context, q []byte, from netip.AddrPort, allowName func(name string) bool) (res []byte, err error) {
func (r *Resolver) HandlePeerDNSQuery(ctx context.Context, q []byte, from netip.AddrPort, allowName func(name string) bool) (res []byte, err error) {
metricDNSExitProxyQuery.Add(1)
ch := make(chan packet, 1)