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net/tsdial: move more weirdo dialing into new tsdial package, plumb

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Not done yet, but this move more of the outbound dial special casing
from random packages into tsdial, which aspires to be the one unified
place for all outbound dialing shenanigans.

Then this plumbs it all around, so everybody is ultimately
holding on to the same dialer.

As of this commit, macOS/iOS using an exit node should be able to
reach to the exit node's DoH DNS proxy over peerapi, doing the sockopt
to stay within the Network Extension.

A number of steps remain, including but limited to:

* move a bunch more random dialing stuff

* make netstack-mode tailscaled be able to use exit node's DNS proxy,
  teaching tsdial's resolver to use it when an exit node is in use.

Updates #1713

Change-Id: I1e8ee378f125421c2b816f47bc2c6d913ddcd2f5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-11-30 20:39:12 -08:00
committed by Brad Fitzpatrick
parent bf1d69f25b
commit c37af58ea4
21 changed files with 163 additions and 70 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
net/dns/manager.go
View File

@@ -13,6 +13,7 @@ import (
"tailscale.com/health"
"tailscale.com/net/dns/resolver"
"tailscale.com/net/tsaddr"
"tailscale.com/net/tsdial"
"tailscale.com/types/dnstype"
"tailscale.com/types/logger"
"tailscale.com/util/dnsname"
@@ -39,11 +40,14 @@ type Manager struct {
}
// NewManagers created a new manager from the given config.
func NewManager(logf logger.Logf, oscfg OSConfigurator, linkMon *monitor.Mon, linkSel resolver.ForwardLinkSelector) *Manager {
func NewManager(logf logger.Logf, oscfg OSConfigurator, linkMon *monitor.Mon, dialer *tsdial.Dialer, linkSel resolver.ForwardLinkSelector) *Manager {
if dialer == nil {
panic("nil Dialer")
}
logf = logger.WithPrefix(logf, "dns: ")
m := &Manager{
logf: logf,
resolver: resolver.New(logf, linkMon, linkSel),
resolver: resolver.New(logf, linkMon, linkSel, dialer),
os: oscfg,
}
m.logf("using %T", m.os)
@@ -230,7 +234,7 @@ func Cleanup(logf logger.Logf, interfaceName string) {
logf("creating dns cleanup: %v", err)
return
}
dns := NewManager(logf, oscfg, nil, nil)
dns := NewManager(logf, oscfg, nil, new(tsdial.Dialer), nil)
if err := dns.Down(); err != nil {
logf("dns down: %v", err)
}

3
net/dns/manager_test.go
View File

@@ -13,6 +13,7 @@ import (
"github.com/google/go-cmp/cmp/cmpopts"
"inet.af/netaddr"
"tailscale.com/net/dns/resolver"
"tailscale.com/net/tsdial"
"tailscale.com/types/dnstype"
"tailscale.com/util/dnsname"
)
@@ -398,7 +399,7 @@ func TestManager(t *testing.T) {
SplitDNS: test.split,
BaseConfig: test.bs,
}
m := NewManager(t.Logf, &f, nil, nil)
m := NewManager(t.Logf, &f, nil, new(tsdial.Dialer), nil)
m.resolver.TestOnlySetHook(f.SetResolver)
if err := m.Set(test.in); err != nil {

12
net/dns/resolver/forwarder.go
View File

@@ -26,6 +26,7 @@ import (
"inet.af/netaddr"
"tailscale.com/hostinfo"
"tailscale.com/net/netns"
"tailscale.com/net/tsdial"
"tailscale.com/types/dnstype"
"tailscale.com/types/logger"
"tailscale.com/util/dnsname"
@@ -159,7 +160,8 @@ type resolverAndDelay struct {
type forwarder struct {
logf logger.Logf
linkMon *monitor.Mon
linkSel ForwardLinkSelector
linkSel ForwardLinkSelector // TODO(bradfitz): remove this when tsdial.Dialer absords it
dialer *tsdial.Dialer
dohSem chan struct{}
ctx context.Context // good until Close
@@ -205,11 +207,12 @@ func maxDoHInFlight(goos string) int {
return 1000
}
func newForwarder(logf logger.Logf, responses chan packet, linkMon *monitor.Mon, linkSel ForwardLinkSelector) *forwarder {
func newForwarder(logf logger.Logf, responses chan packet, linkMon *monitor.Mon, linkSel ForwardLinkSelector, dialer *tsdial.Dialer) *forwarder {
f := &forwarder{
logf: logger.WithPrefix(logf, "forward: "),
linkMon: linkMon,
linkSel: linkSel,
dialer: dialer,
responses: responses,
dohSem: make(chan struct{}, maxDoHInFlight(runtime.GOOS)),
}
@@ -423,10 +426,7 @@ func (f *forwarder) sendDoH(ctx context.Context, urlBase string, c *http.Client,
// send expects the reply to have the same txid as txidOut.
func (f *forwarder) send(ctx context.Context, fq *forwardQuery, rr resolverAndDelay) ([]byte, error) {
if strings.HasPrefix(rr.name.Addr, "http://") {
// TODO(bradfitz): this only work for TUN mode right now; plumb a universal dialer
// that can handle the dozen special cases for modes/platforms/routes.
TODOHTTPClient := http.DefaultClient
return f.sendDoH(ctx, rr.name.Addr, TODOHTTPClient, fq.packet)
return f.sendDoH(ctx, rr.name.Addr, f.dialer.PeerAPIHTTPClient(), fq.packet)
}
if strings.HasPrefix(rr.name.Addr, "https://") {
metricDNSFwdErrorType.Add(1)

10
net/dns/resolver/tsdns.go
View File

@@ -27,6 +27,7 @@ import (
dns "golang.org/x/net/dns/dnsmessage"
"inet.af/netaddr"
"tailscale.com/net/tsaddr"
"tailscale.com/net/tsdial"
"tailscale.com/types/dnstype"
"tailscale.com/types/logger"
"tailscale.com/util/clientmetric"
@@ -192,6 +193,7 @@ func WriteRoutes(w *bufio.Writer, routes map[dnsname.FQDN][]dnstype.Resolver) {
type Resolver struct {
logf logger.Logf
linkMon *monitor.Mon // or nil
dialer *tsdial.Dialer // non-nil
saveConfigForTests func(cfg Config) // used in tests to capture resolver config
// forwarder forwards requests to upstream nameservers.
forwarder *forwarder
@@ -223,7 +225,10 @@ type ForwardLinkSelector interface {
// New returns a new resolver.
// linkMon optionally specifies a link monitor to use for socket rebinding.
func New(logf logger.Logf, linkMon *monitor.Mon, linkSel ForwardLinkSelector) *Resolver {
func New(logf logger.Logf, linkMon *monitor.Mon, linkSel ForwardLinkSelector, dialer *tsdial.Dialer) *Resolver {
if dialer == nil {
panic("nil Dialer")
}
r := &Resolver{
logf: logger.WithPrefix(logf, "resolver: "),
linkMon: linkMon,
@@ -232,8 +237,9 @@ func New(logf logger.Logf, linkMon *monitor.Mon, linkSel ForwardLinkSelector) *R
closed: make(chan struct{}),
hostToIP: map[dnsname.FQDN][]netaddr.IP{},
ipToHost: map[netaddr.IP]dnsname.FQDN{},
dialer: dialer,
}
r.forwarder = newForwarder(r.logf, r.responses, linkMon, linkSel)
r.forwarder = newForwarder(r.logf, r.responses, linkMon, linkSel, dialer)
return r
}

5
net/dns/resolver/tsdns_test.go
View File

@@ -18,6 +18,7 @@ import (
dns "golang.org/x/net/dns/dnsmessage"
"inet.af/netaddr"
"tailscale.com/net/tsdial"
"tailscale.com/tstest"
"tailscale.com/types/dnstype"
"tailscale.com/util/dnsname"
@@ -308,7 +309,7 @@ func TestRDNSNameToIPv6(t *testing.T) {
}
func newResolver(t testing.TB) *Resolver {
return New(t.Logf, nil /* no link monitor */, nil /* no link selector */)
return New(t.Logf, nil /* no link monitor */, nil /* no link selector */, new(tsdial.Dialer))
}
func TestResolveLocal(t *testing.T) {
@@ -1062,7 +1063,7 @@ func TestForwardLinkSelection(t *testing.T) {
return "special"
}
return ""
}))
}), new(tsdial.Dialer))
// Test non-special IP.
if got, err := fwd.packetListener(netaddr.IP{}); err != nil {