#2140 Fixed reflection of hostname change (#2199)

* #2140 Fixed updating of hostname and givenName when it is updated in HostInfo

* #2140 Added integration tests

* #2140 Fix unit tests

* Changed IsAutomaticNameMode to GivenNameHasBeenChanged. Fixed errors in files according to golangci-lint rules

.github/workflows/test-integration.yaml

@@ -50,6 +50,7 @@ jobs:
           - TestEphemeral2006DeletedTooQuickly
           - TestPingAllByHostname
           - TestTaildrop
+          - TestUpdateHostnameFromClient
           - TestExpireNode
           - TestNodeOnlineStatus
           - TestPingAllByIPManyUpDown

CHANGELOG.md

@@ -21,6 +21,7 @@
 - Allow nodes to use SSH agent forwarding [#2145](https://github.com/juanfont/headscale/pull/2145)
 - Fixed processing of fields in post request in MoveNode rpc [#2179](https://github.com/juanfont/headscale/pull/2179)
 - Added conversion of 'Hostname' to 'givenName' in a node with FQDN rules applied [#2198](https://github.com/juanfont/headscale/pull/2198)
+- Fixed updating of hostname and givenName when it is updated in HostInfo [#2199](https://github.com/juanfont/headscale/pull/2199)
 
 ## 0.23.0 (2024-09-18)
 

hscontrol/poll.go

@@ -471,7 +471,7 @@ func (m *mapSession) handleEndpointUpdate() {
 
 	// Check if the Hostinfo of the node has changed.
 	// If it has changed, check if there has been a change to
-	// the routable IPs of the host and update update them in
+	// the routable IPs of the host and update them in
 	// the database. Then send a Changed update
 	// (containing the whole node object) to peers to inform about
 	// the route change.
@@ -510,6 +510,12 @@ func (m *mapSession) handleEndpointUpdate() {
 			m.node.ID)
 	}
 
+	// Check if there has been a change to Hostname and update them
+	// in the database. Then send a Changed update
+	// (containing the whole node object) to peers to inform about
+	// the hostname change.
+	m.node.ApplyHostnameFromHostInfo(m.req.Hostinfo)
+
 	if err := m.h.db.DB.Save(m.node).Error; err != nil {
 		m.errf(err, "Failed to persist/update node in the database")
 		http.Error(m.w, "", http.StatusInternalServerError)
@@ -526,7 +532,8 @@ func (m *mapSession) handleEndpointUpdate() {
 			ChangeNodes: []types.NodeID{m.node.ID},
 			Message:     "called from handlePoll -> update",
 		},
-		m.node.ID)
+		m.node.ID,
+	)
 
 	m.w.WriteHeader(http.StatusOK)
 	mapResponseEndpointUpdates.WithLabelValues("ok").Inc()

hscontrol/types/node.go

@@ -97,6 +97,11 @@ type (
 	Nodes []*Node
 )
 
+// GivenNameHasBeenChanged returns whether the `givenName` can be automatically changed based on the `Hostname` of the node.
+func (node *Node) GivenNameHasBeenChanged() bool {
+	return node.GivenName == util.ConvertWithFQDNRules(node.Hostname)
+}
+
 // IsExpired returns whether the node registration has expired.
 func (node Node) IsExpired() bool {
 	// If Expiry is not set, the client has not indicated that
@@ -347,6 +352,21 @@ func (node *Node) RegisterMethodToV1Enum() v1.RegisterMethod {
 	}
 }
 
+// ApplyHostnameFromHostInfo takes a Hostinfo struct and updates the node.
+func (node *Node) ApplyHostnameFromHostInfo(hostInfo *tailcfg.Hostinfo) {
+	if hostInfo == nil {
+		return
+	}
+
+	if node.Hostname != hostInfo.Hostname {
+		if node.GivenNameHasBeenChanged() {
+			node.GivenName = util.ConvertWithFQDNRules(hostInfo.Hostname)
+		}
+
+		node.Hostname = hostInfo.Hostname
+	}
+}
+
 // ApplyPeerChange takes a PeerChange struct and updates the node.
 func (node *Node) ApplyPeerChange(change *tailcfg.PeerChange) {
 	if change.Key != nil {

hscontrol/types/node_test.go

@@ -337,6 +337,66 @@ func TestPeerChangeFromMapRequest(t *testing.T) {
 	}
 }
 
+func TestApplyHostnameFromHostInfo(t *testing.T) {
+	tests := []struct {
+		name       string
+		nodeBefore Node
+		change     *tailcfg.Hostinfo
+		want       Node
+	}{
+		{
+			name: "hostinfo-not-exists",
+			nodeBefore: Node{
+				GivenName: "manual-test.local",
+				Hostname:  "TestHost.Local",
+			},
+			change: nil,
+			want: Node{
+				GivenName: "manual-test.local",
+				Hostname:  "TestHost.Local",
+			},
+		},
+		{
+			name: "hostinfo-exists-no-automatic-givenName",
+			nodeBefore: Node{
+				GivenName: "manual-test.local",
+				Hostname:  "TestHost.Local",
+			},
+			change: &tailcfg.Hostinfo{
+				Hostname: "NewHostName.Local",
+			},
+			want: Node{
+				GivenName: "manual-test.local",
+				Hostname:  "NewHostName.Local",
+			},
+		},
+		{
+			name: "hostinfo-exists-automatic-givenName",
+			nodeBefore: Node{
+				GivenName: "automaticname.test",
+				Hostname:  "AutomaticName.Test",
+			},
+			change: &tailcfg.Hostinfo{
+				Hostname: "NewHostName.Local",
+			},
+			want: Node{
+				GivenName: "newhostname.local",
+				Hostname:  "NewHostName.Local",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tt.nodeBefore.ApplyHostnameFromHostInfo(tt.change)
+
+			if diff := cmp.Diff(tt.want, tt.nodeBefore, util.Comparers...); diff != "" {
+				t.Errorf("Patch unexpected result (-want +got):\n%s", diff)
+			}
+		})
+	}
+}
+
 func TestApplyPeerChange(t *testing.T) {
 	tests := []struct {
 		name       string

integration/general_test.go

@@ -5,12 +5,14 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/netip"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
 
 	v1 "github.com/juanfont/headscale/gen/go/headscale/v1"
 	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/juanfont/headscale/hscontrol/util"
 	"github.com/juanfont/headscale/integration/hsic"
 	"github.com/juanfont/headscale/integration/tsic"
 	"github.com/rs/zerolog/log"
@@ -654,6 +656,134 @@ func TestTaildrop(t *testing.T) {
 	}
 }
 
+func TestUpdateHostnameFromClient(t *testing.T) {
+	IntegrationSkip(t)
+	t.Parallel()
+
+	user := "update-hostname-from-client"
+
+	hostnames := map[string]string{
+		"1": "user1-host",
+		"2": "User2-Host",
+		"3": "user3-host",
+	}
+
+	scenario, err := NewScenario(dockertestMaxWait())
+	assertNoErrf(t, "failed to create scenario: %s", err)
+	defer scenario.ShutdownAssertNoPanics(t)
+
+	spec := map[string]int{
+		user: 3,
+	}
+
+	err = scenario.CreateHeadscaleEnv(spec, []tsic.Option{}, hsic.WithTestName("updatehostname"))
+	assertNoErrHeadscaleEnv(t, err)
+
+	allClients, err := scenario.ListTailscaleClients()
+	assertNoErrListClients(t, err)
+
+	err = scenario.WaitForTailscaleSync()
+	assertNoErrSync(t, err)
+
+	headscale, err := scenario.Headscale()
+	assertNoErrGetHeadscale(t, err)
+
+	// update hostnames using the up command
+	for _, client := range allClients {
+		status, err := client.Status()
+		assertNoErr(t, err)
+
+		command := []string{
+			"tailscale",
+			"set",
+			"--hostname=" + hostnames[string(status.Self.ID)],
+		}
+		_, _, err = client.Execute(command)
+		assertNoErrf(t, "failed to set hostname: %s", err)
+	}
+
+	err = scenario.WaitForTailscaleSync()
+	assertNoErrSync(t, err)
+
+	var nodes []*v1.Node
+	err = executeAndUnmarshal(
+		headscale,
+		[]string{
+			"headscale",
+			"node",
+			"list",
+			"--output",
+			"json",
+		},
+		&nodes,
+	)
+
+	assertNoErr(t, err)
+	assert.Len(t, nodes, 3)
+
+	for _, node := range nodes {
+		hostname := hostnames[strconv.FormatUint(node.GetId(), 10)]
+		assert.Equal(t, hostname, node.GetName())
+		assert.Equal(t, util.ConvertWithFQDNRules(hostname), node.GetGivenName())
+	}
+
+	// Rename givenName in nodes
+	for _, node := range nodes {
+		givenName := fmt.Sprintf("%d-givenname", node.GetId())
+		_, err = headscale.Execute(
+			[]string{
+				"headscale",
+				"node",
+				"rename",
+				givenName,
+				"--identifier",
+				strconv.FormatUint(node.GetId(), 10),
+			})
+		assertNoErr(t, err)
+	}
+
+	time.Sleep(5 * time.Second)
+
+	// Verify that the clients can see the new hostname, but no givenName
+	for _, client := range allClients {
+		status, err := client.Status()
+		assertNoErr(t, err)
+
+		command := []string{
+			"tailscale",
+			"set",
+			"--hostname=" + hostnames[string(status.Self.ID)] + "NEW",
+		}
+		_, _, err = client.Execute(command)
+		assertNoErrf(t, "failed to set hostname: %s", err)
+	}
+
+	err = scenario.WaitForTailscaleSync()
+	assertNoErrSync(t, err)
+
+	err = executeAndUnmarshal(
+		headscale,
+		[]string{
+			"headscale",
+			"node",
+			"list",
+			"--output",
+			"json",
+		},
+		&nodes,
+	)
+
+	assertNoErr(t, err)
+	assert.Len(t, nodes, 3)
+
+	for _, node := range nodes {
+		hostname := hostnames[strconv.FormatUint(node.GetId(), 10)]
+		givenName := fmt.Sprintf("%d-givenname", node.GetId())
+		assert.Equal(t, hostname+"NEW", node.GetName())
+		assert.Equal(t, givenName, node.GetGivenName())
+	}
+}
+
 func TestExpireNode(t *testing.T) {
 	IntegrationSkip(t)
 	t.Parallel()