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client, cmd/tailscale/cli, feature/relayserver, net/udprelay: implement tailscale debug peer-relay-sessions (#17239)

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Fixes tailscale/corp#30035

Signed-off-by: Dylan Bargatze <dylan@tailscale.com>
Signed-off-by: Jordan Whited <jordan@tailscale.com>
Co-authored-by: Dylan Bargatze <dylan@tailscale.com>
This commit is contained in:
Jordan Whited
2025-09-23 15:26:10 -07:00
committed by GitHub
parent 87ccfbd250
commit 4657cbdb11
13 changed files with 341 additions and 7 deletions
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45
tstest/integration/integration_test.go
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@@ -38,6 +38,7 @@ import (
"tailscale.com/ipn"
"tailscale.com/net/tsaddr"
"tailscale.com/net/tstun"
"tailscale.com/net/udprelay/status"
"tailscale.com/tailcfg"
"tailscale.com/tstest"
"tailscale.com/tstest/integration/testcontrol"
@@ -1526,7 +1527,8 @@ func TestEncryptStateMigration(t *testing.T) {
// TestPeerRelayPing creates three nodes with one acting as a peer relay.
// The test succeeds when "tailscale ping" flows through the peer
// relay between all 3 nodes.
// relay between all 3 nodes, and "tailscale debug peer-relay-sessions" returns
// expected values.
func TestPeerRelayPing(t *testing.T) {
tstest.Shard(t)
tstest.Parallel(t)
@@ -1624,6 +1626,47 @@ func TestPeerRelayPing(t *testing.T) {
t.Fatal(err)
}
}
allControlNodes := env.Control.AllNodes()
wantSessionsForDiscoShorts := make(set.Set[[2]string])
for i, a := range allControlNodes {
if i == len(allControlNodes)-1 {
break
}
for _, z := range allControlNodes[i+1:] {
wantSessionsForDiscoShorts.Add([2]string{a.DiscoKey.ShortString(), z.DiscoKey.ShortString()})
}
}
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
debugSessions, err := peerRelay.LocalClient().DebugPeerRelaySessions(ctx)
cancel()
if err != nil {
t.Fatalf("debug peer-relay-sessions failed: %v", err)
}
if len(debugSessions.Sessions) != len(wantSessionsForDiscoShorts) {
t.Errorf("got %d peer relay sessions, want %d", len(debugSessions.Sessions), len(wantSessionsForDiscoShorts))
}
for _, session := range debugSessions.Sessions {
if !wantSessionsForDiscoShorts.Contains([2]string{session.Client1.ShortDisco, session.Client2.ShortDisco}) &&
!wantSessionsForDiscoShorts.Contains([2]string{session.Client2.ShortDisco, session.Client1.ShortDisco}) {
t.Errorf("peer relay session for disco keys %s<->%s not found in debug peer-relay-sessions: %+v", session.Client1.ShortDisco, session.Client2.ShortDisco, debugSessions.Sessions)
}
for _, client := range []status.ClientInfo{session.Client1, session.Client2} {
if client.BytesTx == 0 {
t.Errorf("unexpected 0 bytes TX counter in peer relay session: %+v", session)
}
if client.PacketsTx == 0 {
t.Errorf("unexpected 0 packets TX counter in peer relay session: %+v", session)
}
if !client.Endpoint.IsValid() {
t.Errorf("unexpected endpoint zero value in peer relay session: %+v", session)
}
if len(client.ShortDisco) == 0 {
t.Errorf("unexpected zero len short disco in peer relay session: %+v", session)
}
}
}
}
func TestC2NDebugNetmap(t *testing.T) {