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net/tsdial: give netstack a Dialer, start refactoring name resolution

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This starts to refactor tsdial.Dialer's name resolution to have
different stages: in-memory MagicDNS vs system resolution. A future
change will plug in ExitDNS resolution.

This also plumbs a Dialer into netstack and unexports the dnsMap
internals.

And it removes some of the async AddNetworkMapCallback usage and
replaces it with synchronous updates of the Dialer's netmap
from LocalBackend, since the LocalBackend has the Dialer too.

Updates #3475

Change-Id: Idcb7b1169878c74f0522f5151031ccbc49fe4cb4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-12-02 11:10:35 -08:00
committed by Brad Fitzpatrick
parent 768baafcb5
commit adc5997592
10 changed files with 99 additions and 83 deletions
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6
cmd/tailscaled/tailscaled.go
View File

@@ -317,7 +317,7 @@ func run() error {
panic("internal error: exit node resolver not wired up")
}
ns, err := newNetstack(logf, e)
ns, err := newNetstack(logf, dialer, e)
if err != nil {
return fmt.Errorf("newNetstack: %w", err)
}
@@ -525,12 +525,12 @@ func runDebugServer(mux *http.ServeMux, addr string) {
}
}
func newNetstack(logf logger.Logf, e wgengine.Engine) (*netstack.Impl, error) {
func newNetstack(logf logger.Logf, dialer *tsdial.Dialer, e wgengine.Engine) (*netstack.Impl, error) {
tunDev, magicConn, ok := e.(wgengine.InternalsGetter).GetInternals()
if !ok {
return nil, fmt.Errorf("%T is not a wgengine.InternalsGetter", e)
}
return netstack.Create(logf, tunDev, e, magicConn)
return netstack.Create(logf, tunDev, e, magicConn, dialer)
}
// mustStartProxyListeners creates listeners for local SOCKS and HTTP

7
cmd/tailscaled/tailscaled_windows.go
View File

@@ -32,6 +32,7 @@ import (
"tailscale.com/ipn/ipnserver"
"tailscale.com/logpolicy"
"tailscale.com/net/dns"
"tailscale.com/net/tsdial"
"tailscale.com/net/tstun"
"tailscale.com/safesocket"
"tailscale.com/types/logger"
@@ -182,6 +183,7 @@ func startIPNServer(ctx context.Context, logid string) error {
if err != nil {
return err
}
dialer := new(tsdial.Dialer)
getEngineRaw := func() (wgengine.Engine, error) {
dev, devName, err := tstun.New(logf, "Tailscale")
@@ -208,13 +210,14 @@ func startIPNServer(ctx context.Context, logid string) error {
DNS: d,
ListenPort: 41641,
LinkMonitor: linkMon,
Dialer: dialer,
})
if err != nil {
r.Close()
dev.Close()
return nil, fmt.Errorf("engine: %w", err)
}
ns, err := newNetstack(logf, eng)
ns, err := newNetstack(logf, dialer, eng)
if err != nil {
return nil, fmt.Errorf("newNetstack: %w", err)
}
@@ -294,7 +297,7 @@ func startIPNServer(ctx context.Context, logid string) error {
return fmt.Errorf("safesocket.Listen: %v", err)
}
err = ipnserver.Run(ctx, logf, ln, store, linkMon, logid, getEngine, ipnServerOpts())
err = ipnserver.Run(ctx, logf, ln, store, linkMon, dialer, logid, getEngine, ipnServerOpts())
if err != nil {
logf("ipnserver.Run: %v", err)
}