fix three V1.0.1 leftover tails

1. per-client links (LinkProvider.LinksForClient) now apply the
   inbound's managed Host records with the same precedence as
   subscriptions and export-all (host endpoints after fallback
   projection); zero-host inbounds keep the legacy output.
2. agent node writes no longer store the form placeholder
   address='agent', port=2053: CreateFromRequest/UpdateFromRequest
   sanitize it to the node's resolved agent address (update) or
   empty (create / unreported), port 0; normalize gains a lenient
   endpoint mode for agent writes only.
3. runtime Remote.baseURL refuses the legacy 'agent' placeholder
   with a clear no-panel-endpoint error instead of splicing it into
   a dialable https://agent:2053 URL.

internal/sub/links.go

@@ -38,6 +38,16 @@ func (p *LinkProvider) SubLinksForSubId(host, subId string) ([]string, error) {
 func (p *LinkProvider) LinksForClient(host string, inbound *model.Inbound, email string) []string {
 	svc := p.build(host)
 	svc.projectThroughFallbackMaster(inbound)
+	// Managed Host records apply to per-client links exactly as they do
+	// to subscriptions (getSubs) and export-all (inboundLinks): after the
+	// fallback projection, a host's address/TLS wins over the plain
+	// endpoint. Inbounds without hosts keep the legacy output unchanged;
+	// a client that cannot be resolved falls back to the plain link too.
+	if eps := svc.hostEndpoints(inbound, "raw"); len(eps) > 0 {
+		if client, ok := svc.clientForLink(inbound, email); ok {
+			return splitLinkLines(svc.linkFromHosts(inbound, client, eps))
+		}
+	}
 	return splitLinkLines(svc.GetLink(inbound, email))
 }
 

internal/sub/links_host_test.go

@@ -0,0 +1,117 @@
+package sub
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/mhsanaei/3x-ui/v3/internal/database"
+	"github.com/mhsanaei/3x-ui/v3/internal/database/model"
+)
+
+// Per-client links (GET /panel/api/clients/links/:email, served by
+// LinksForClient) must apply an inbound's managed Host records with the
+// same precedence as subscriptions (GetSubs) and export-all
+// (inboundLinks): after the fallback projection the host endpoint wins.
+// Before this coverage existed the per-client endpoint skipped hosts
+// entirely, for traditional and agent inbounds alike.
+
+const linksHostStream = `{"network":"tcp","security":"tls","tlsSettings":{"serverName":"base.sni"}}`
+
+func TestLinksForClient_AppliesHostRecords(t *testing.T) {
+	seedSubDB(t)
+	ib := seedSubInbound(t, "s1", "h", 4433, 1, linksHostStream)
+	seedHost(t, &model.Host{InboundId: ib.Id, Remark: "CDN", Address: "cdn.example.com", Port: 8443, Security: "tls", Sni: "cdn.sni"})
+
+	links := NewLinkProvider().LinksForClient("req.example.com", ib, "h@e")
+	if len(links) != 1 {
+		t.Fatalf("links = %d, want 1: %v", len(links), links)
+	}
+	if !strings.Contains(links[0], "cdn.example.com:8443") || !strings.Contains(links[0], "sni=cdn.sni") {
+		t.Fatalf("per-client link must carry the host endpoint: %s", links[0])
+	}
+	if strings.Contains(links[0], "203.0.113.5:4433") {
+		t.Fatalf("per-client link leaked the plain inbound endpoint despite a host record: %s", links[0])
+	}
+}
+
+func TestLinksForClient_MultipleHostsOrdered(t *testing.T) {
+	seedSubDB(t)
+	ib := seedSubInbound(t, "s1", "m", 4435, 1, linksHostStream)
+	seedHost(t, &model.Host{InboundId: ib.Id, SortOrder: 2, Remark: "B", Address: "b.cdn.com", Port: 8443, Security: "tls"})
+	seedHost(t, &model.Host{InboundId: ib.Id, SortOrder: 1, Remark: "A", Address: "a.cdn.com", Port: 2096, Security: "tls"})
+
+	links := NewLinkProvider().LinksForClient("req.example.com", ib, "m@e")
+	if len(links) != 2 {
+		t.Fatalf("links = %d, want 2 (one per host): %v", len(links), links)
+	}
+	if !strings.Contains(links[0], "a.cdn.com:2096") || !strings.Contains(links[1], "b.cdn.com:8443") {
+		t.Fatalf("host links out of order or wrong: %v", links)
+	}
+}
+
+func TestLinksForClient_NoHosts_Unchanged(t *testing.T) {
+	seedSubDB(t)
+	ib := seedSubInbound(t, "s1", "z", 4436, 1, linksHostStream)
+
+	links := NewLinkProvider().LinksForClient("req.example.com", ib, "z@e")
+	if len(links) != 1 {
+		t.Fatalf("links = %d, want 1: %v", len(links), links)
+	}
+	if !strings.Contains(links[0], "203.0.113.5:4436") {
+		t.Fatalf("zero-host per-client link must keep the legacy endpoint: %s", links[0])
+	}
+}
+
+// seedAgentInbound wires a node + agent binding (telemetry IPv4) and an
+// inbound hosted on that node, mirroring production agent rows.
+func seedAgentInbound(t *testing.T, tag string, port int) (*model.Inbound, *model.Node) {
+	t.Helper()
+	db := database.GetDB()
+	node := &model.Node{Name: "agent-" + tag, Scheme: "https", Address: "agent", Port: 2053, Enable: true}
+	if err := db.Create(node).Error; err != nil {
+		t.Fatalf("create node: %v", err)
+	}
+	ag := &model.AgentNode{TokenHash: "hash-" + tag, Name: node.Name, NodeID: &node.Id, IPv4: "198.51.100.23", LastSeen: 2000}
+	if err := db.Create(ag).Error; err != nil {
+		t.Fatalf("create binding: %v", err)
+	}
+	ib := seedSubInbound(t, "s1", tag, port, 1, linksHostStream)
+	if err := db.Model(&model.Inbound{}).Where("id = ?", ib.Id).Update("node_id", node.Id).Error; err != nil {
+		t.Fatalf("attach inbound to node: %v", err)
+	}
+	ib.NodeID = &node.Id
+	return ib, node
+}
+
+func TestLinksForClient_AgentInbound_HostBeatsTelemetry(t *testing.T) {
+	seedSubDB(t)
+	ib, _ := seedAgentInbound(t, "ah", 4437)
+	seedHost(t, &model.Host{InboundId: ib.Id, Remark: "CDN", Address: "cdn.example.com", Port: 8443, Security: "tls"})
+
+	links := NewLinkProvider().LinksForClient("req.example.com", ib, "ah@e")
+	if len(links) != 1 {
+		t.Fatalf("links = %d, want 1: %v", len(links), links)
+	}
+	if !strings.Contains(links[0], "cdn.example.com:8443") {
+		t.Fatalf("agent per-client link must carry the host endpoint: %s", links[0])
+	}
+	if strings.Contains(links[0], "198.51.100.23") {
+		t.Fatalf("host record must win over the agent telemetry address: %s", links[0])
+	}
+}
+
+func TestLinksForClient_AgentInbound_NoHost_TelemetryPreserved(t *testing.T) {
+	seedSubDB(t)
+	ib, _ := seedAgentInbound(t, "an", 4438)
+
+	links := NewLinkProvider().LinksForClient("req.example.com", ib, "an@e")
+	if len(links) != 1 {
+		t.Fatalf("links = %d, want 1: %v", len(links), links)
+	}
+	if !strings.Contains(links[0], "198.51.100.23:4438") {
+		t.Fatalf("agent per-client link without hosts must keep the telemetry endpoint: %s", links[0])
+	}
+	if strings.Contains(links[0], "@agent:") {
+		t.Fatalf("agent per-client link leaks the placeholder address: %s", links[0])
+	}
+}

internal/web/runtime/remote.go

@@ -151,11 +151,26 @@ func (r *Remote) httpClient() (*http.Client, error) {
 	return r.client, r.clientErr
 }
 
+// isAgentPlaceholderAddress reports whether addr is the placeholder the
+// node form used to store for agent nodes ("agent"). Agent nodes dial out
+// to the master and expose no panel endpoint; the write path no longer
+// stores the placeholder (see sanitizeAgentEndpoint in the node service),
+// but rows written earlier still carry it, and "agent" is a syntactically
+// valid hostname — without this guard baseURL would splice it into a
+// dialable URL (https://agent:2053/...) and do() would fire real requests
+// at whatever "agent" happens to resolve to.
+func isAgentPlaceholderAddress(addr string) bool {
+	return strings.EqualFold(addr, "agent")
+}
+
 func (r *Remote) baseURL() (string, error) {
 	addr, err := netsafe.NormalizeHost(r.node.Address)
 	if err != nil {
 		return "", err
 	}
+	if isAgentPlaceholderAddress(addr) {
+		return "", errors.New("node has no panel endpoint (agent-managed nodes cannot be dialed)")
+	}
 	scheme := r.node.Scheme
 	if scheme != "http" && scheme != "https" {
 		scheme = "https"

internal/web/runtime/remote_test.go

@@ -273,6 +273,33 @@ func TestRemoteBaseURL(t *testing.T) {
 	}
 }
 
+// Legacy agent-node rows store the node form's placeholder pair
+// (address "agent", port 2053). "agent" is a syntactically valid
+// hostname, so without a guard baseURL would splice it into a dialable
+// URL — https://agent:2053/... — and do() would fire real requests at
+// whatever "agent" resolves to. The placeholder must be refused with a
+// clear endpoint error instead, in any casing.
+func TestRemoteBaseURL_RejectsAgentPlaceholder(t *testing.T) {
+	for _, addr := range []string{"agent", "Agent", "AGENT"} {
+		r := NewRemote(&model.Node{Address: addr, Port: 2053, Scheme: "https"}, nil)
+		got, err := r.baseURL()
+		if err == nil || !strings.Contains(err.Error(), "no panel endpoint") {
+			t.Fatalf("baseURL(%q) = %q, %v; want a panel-endpoint error", addr, got, err)
+		}
+	}
+}
+
+// The latent trigger: a placeholder row that also carries a panel API
+// token passes do()'s credential gate and reaches baseURL. The request
+// must die there — never on the network.
+func TestRemoteDo_AgentPlaceholderNeverDials(t *testing.T) {
+	r := NewRemote(&model.Node{Address: "agent", Port: 2053, Scheme: "https", ApiToken: "tok"}, nil)
+	_, err := r.do(context.Background(), http.MethodGet, "/probe", nil)
+	if err == nil || !strings.Contains(err.Error(), "no panel endpoint") {
+		t.Fatalf("do() error = %v, want a panel-endpoint error", err)
+	}
+}
+
 func TestIsNonEmptySlice(t *testing.T) {
 	cases := []struct {
 		name string

internal/web/service/node.go

@@ -435,18 +435,32 @@ func normalizeBasePath(p string) string {
 }
 
 func (s *NodeService) normalize(n *model.Node) error {
+	return s.normalizeMode(n, false)
+}
+
+// normalizeMode validates a node row before it is stored. agentEndpoint
+// marks an agent-node write: agent nodes have no panel endpoint to dial,
+// so an unset address/port pair (the form placeholder, sanitized away by
+// sanitizeAgentEndpoint) is legitimate and skips the host/port checks.
+// Any value that IS present is validated exactly like a traditional
+// node's.
+func (s *NodeService) normalizeMode(n *model.Node, agentEndpoint bool) error {
 	n.Name = strings.TrimSpace(n.Name)
 	n.ApiToken = strings.TrimSpace(n.ApiToken)
 	if n.Name == "" {
 		return common.NewError("node name is required")
 	}
-	addr, err := netsafe.NormalizeHost(n.Address)
-	if err != nil {
-		return common.NewError(err.Error())
+	if !agentEndpoint || n.Address != "" {
+		addr, err := netsafe.NormalizeHost(n.Address)
+		if err != nil {
+			return common.NewError(err.Error())
+		}
+		n.Address = addr
 	}
-	n.Address = addr
-	if n.Port <= 0 || n.Port > 65535 {
-		return common.NewError("node port must be 1-65535")
+	if !agentEndpoint || n.Port != 0 {
+		if n.Port <= 0 || n.Port > 65535 {
+			return common.NewError("node port must be 1-65535")
+		}
 	}
 	if n.Scheme != "http" && n.Scheme != "https" {
 		n.Scheme = "https"
@@ -487,7 +501,11 @@ func (s *NodeService) normalize(n *model.Node) error {
 }
 
 func (s *NodeService) Create(n *model.Node) error {
-	if err := s.normalize(n); err != nil {
+	return s.create(n, false)
+}
+
+func (s *NodeService) create(n *model.Node, agentEndpoint bool) error {
+	if err := s.normalizeMode(n, agentEndpoint); err != nil {
 		return err
 	}
 	db := database.GetDB()
@@ -520,13 +538,40 @@ func (s *NodeService) CreateFromRequest(req *NodeMutationRequest) (*NodeView, er
 	if err := req.validateCredentials(true); err != nil {
 		return nil, err
 	}
+	isAgent := req.NodeType == "agent"
+	if isAgent {
+		// A brand-new agent node has no binding yet, so no resolved
+		// address can be known: the placeholder sanitizes to empty and
+		// is filled in by later writes once the agent reports.
+		sanitizeAgentEndpoint(req, "")
+	}
 	n := req.toNode()
-	if err := s.Create(n); err != nil {
+	if err := s.create(n, isAgent); err != nil {
 		return nil, err
 	}
 	return toNodeView(n), nil
 }
 
+// resolvedAgentAddress returns the externally usable address of the agent
+// bound to a node (latest binding wins, via ResolveAgentAddresses), or ""
+// when the node has no bound agent or the agent never reported one. The
+// stored row of an agent node carries this value (or empty) instead of
+// the create form's placeholder — see sanitizeAgentEndpoint.
+func (s *NodeService) resolvedAgentAddress(nodeID int) string {
+	var ag model.AgentNode
+	if err := database.GetDB().
+		Where("node_id = ?", nodeID).
+		Order("last_seen DESC").
+		First(&ag).Error; err != nil {
+		return ""
+	}
+	v4, v6 := ResolveAgentAddresses(&ag)
+	if v4 != "" {
+		return v4
+	}
+	return v6
+}
+
 func (s *NodeService) Update(id int, in *model.Node) error {
 	if err := s.normalize(in); err != nil {
 		return err
@@ -583,8 +628,12 @@ func (s *NodeService) UpdateFromRequest(id int, req *NodeMutationRequest) error
 	if err := req.validateCredentials(false); err != nil {
 		return err
 	}
+	isAgent := req.NodeType == "agent" || s.IsAgentManaged(id)
+	if isAgent {
+		sanitizeAgentEndpoint(req, s.resolvedAgentAddress(id))
+	}
 	in := req.toNode()
-	if err := s.normalize(in); err != nil {
+	if err := s.normalizeMode(in, isAgent); err != nil {
 		return err
 	}
 	inboundTagsJSON, err := json.Marshal(in.InboundTags)
@@ -608,7 +657,6 @@ func (s *NodeService) UpdateFromRequest(id int, req *NodeMutationRequest) error
 	}
 	// Agent nodes authenticate with their agent token, never a panel API
 	// token — the requirement below must not make them uneditable.
-	isAgent := req.NodeType == "agent" || s.IsAgentManaged(id)
 	if !isAgent && apiToken == "" && in.Enable && in.TlsVerifyMode != "mtls" {
 		return common.NewError("apiToken is required unless mtls is enabled")
 	}

internal/web/service/node_agent_endpoint_test.go

@@ -0,0 +1,152 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/mhsanaei/3x-ui/v3/internal/database"
+	"github.com/mhsanaei/3x-ui/v3/internal/database/model"
+)
+
+// Agent nodes have no panel endpoint: the node form submits the
+// placeholder pair address="agent", port=2053 for them. The write paths
+// must never store that pair — an agent node's row carries its resolved
+// address when one is known, or empty when it is not — while traditional
+// nodes keep the strict endpoint validation they always had.
+
+func strPtr(s string) *string { return &s }
+
+func TestCreateFromRequest_AgentPlaceholderNotStored(t *testing.T) {
+	setupConflictDB(t)
+	svc := &NodeService{}
+
+	view, err := svc.CreateFromRequest(&NodeMutationRequest{
+		Name: "agent-new", Enable: true, Scheme: "https",
+		Address: "agent", Port: 2053, NodeType: "agent",
+	})
+	if err != nil {
+		t.Fatalf("CreateFromRequest(agent): %v", err)
+	}
+	if view.Address == "agent" || view.Port == 2053 {
+		t.Fatalf("create view still carries the placeholder: %+v", view)
+	}
+	stored, err := svc.GetById(view.Id)
+	if err != nil {
+		t.Fatalf("GetById: %v", err)
+	}
+	// A brand-new agent node has no binding, hence no resolved address:
+	// the honest stored value is empty, port 0.
+	if stored.Address != "" || stored.Port != 0 {
+		t.Fatalf("stored agent endpoint = %q:%d, want empty:0", stored.Address, stored.Port)
+	}
+}
+
+func TestCreateFromRequest_TraditionalKeepsEndpoint(t *testing.T) {
+	setupConflictDB(t)
+	svc := &NodeService{}
+
+	view, err := svc.CreateFromRequest(&NodeMutationRequest{
+		Name: "trad-new", Enable: true, Scheme: "https",
+		Address: "198.51.100.10", Port: 8443, ApiToken: strPtr("tok-1"),
+	})
+	if err != nil {
+		t.Fatalf("CreateFromRequest(traditional): %v", err)
+	}
+	stored, err := svc.GetById(view.Id)
+	if err != nil {
+		t.Fatalf("GetById: %v", err)
+	}
+	if stored.Address != "198.51.100.10" || stored.Port != 8443 {
+		t.Fatalf("stored traditional endpoint = %q:%d, want 198.51.100.10:8443", stored.Address, stored.Port)
+	}
+}
+
+func TestCreateFromRequest_TraditionalEmptyAddressStillRejected(t *testing.T) {
+	setupConflictDB(t)
+	svc := &NodeService{}
+
+	if _, err := svc.CreateFromRequest(&NodeMutationRequest{
+		Name: "trad-bad", Enable: true, Scheme: "https", ApiToken: strPtr("tok-2"),
+	}); err == nil {
+		t.Fatal("traditional create with an empty address must still fail validation")
+	}
+}
+
+// seedAgentNodeRow stores a legacy placeholder row plus its agent
+// binding; ipv4 == "" models an agent that never reported an address.
+func seedAgentNodeRow(t *testing.T, name, ipv4 string) *model.Node {
+	t.Helper()
+	db := database.GetDB()
+	node := &model.Node{Name: name, Scheme: "https", Address: "agent", Port: 2053, Enable: true}
+	if err := db.Create(node).Error; err != nil {
+		t.Fatalf("create node: %v", err)
+	}
+	ag := &model.AgentNode{TokenHash: "hash-" + name, Name: name, NodeID: &node.Id, IPv4: ipv4, LastSeen: 100}
+	if err := db.Create(ag).Error; err != nil {
+		t.Fatalf("create binding: %v", err)
+	}
+	return node
+}
+
+func TestUpdateFromRequest_AgentPlaceholderReplacedByResolved(t *testing.T) {
+	setupConflictDB(t)
+	node := seedAgentNodeRow(t, "agent-upd", "203.0.113.9")
+	svc := &NodeService{}
+
+	// Exactly what the edit form submits for an agent node today.
+	err := svc.UpdateFromRequest(node.Id, &NodeMutationRequest{
+		Name: "agent-upd", Enable: true, Scheme: "https",
+		Address: "agent", Port: 2053, NodeType: "agent",
+	})
+	if err != nil {
+		t.Fatalf("UpdateFromRequest(agent): %v", err)
+	}
+	stored, err := svc.GetById(node.Id)
+	if err != nil {
+		t.Fatalf("GetById: %v", err)
+	}
+	if stored.Address != "203.0.113.9" || stored.Port != 0 {
+		t.Fatalf("stored agent endpoint = %q:%d, want resolved 203.0.113.9:0", stored.Address, stored.Port)
+	}
+}
+
+func TestUpdateFromRequest_AgentNoReport_SanitizesToEmpty(t *testing.T) {
+	setupConflictDB(t)
+	node := seedAgentNodeRow(t, "agent-silent", "")
+	svc := &NodeService{}
+
+	err := svc.UpdateFromRequest(node.Id, &NodeMutationRequest{
+		Name: "agent-silent", Enable: true, Scheme: "https",
+		Address: "agent", Port: 2053, NodeType: "agent",
+	})
+	if err != nil {
+		t.Fatalf("UpdateFromRequest(agent): %v", err)
+	}
+	stored, err := svc.GetById(node.Id)
+	if err != nil {
+		t.Fatalf("GetById: %v", err)
+	}
+	if stored.Address != "" || stored.Port != 0 {
+		t.Fatalf("stored agent endpoint = %q:%d, want empty:0 (no placeholder, no invented address)", stored.Address, stored.Port)
+	}
+}
+
+func TestUpdateFromRequest_AgentRealAddressKeptVerbatim(t *testing.T) {
+	setupConflictDB(t)
+	node := seedAgentNodeRow(t, "agent-real", "203.0.113.9")
+	svc := &NodeService{}
+
+	err := svc.UpdateFromRequest(node.Id, &NodeMutationRequest{
+		Name: "agent-real", Enable: true, Scheme: "https",
+		Address: "edge.example.com", Port: 443, NodeType: "agent",
+	})
+	if err != nil {
+		t.Fatalf("UpdateFromRequest(agent, real address): %v", err)
+	}
+	stored, err := svc.GetById(node.Id)
+	if err != nil {
+		t.Fatalf("GetById: %v", err)
+	}
+	if stored.Address != "edge.example.com" || stored.Port != 443 {
+		t.Fatalf("stored agent endpoint = %q:%d, want submitted edge.example.com:443", stored.Address, stored.Port)
+	}
+}

internal/web/service/node_contract.go

@@ -313,6 +313,31 @@ func (r *NodeMutationRequest) validateCredentials(create bool) error {
 	return nil
 }
 
+// isAgentPlaceholderAddress reports whether addr is the placeholder the
+// node form submits for agent nodes ("agent": they dial out to the master
+// and have no panel endpoint to store). Keep in sync with the guard in
+// internal/web/runtime's baseURL, which refuses to dial the placeholder
+// for rows written before this sanitization existed.
+func isAgentPlaceholderAddress(addr string) bool {
+	return strings.EqualFold(strings.TrimSpace(addr), "agent")
+}
+
+// sanitizeAgentEndpoint rewrites an agent-node write's endpoint fields so
+// the form placeholder never reaches the nodes table: a placeholder (or
+// empty) address is replaced by the node's currently resolved address —
+// "" when none is known yet (a new node, or an agent that never
+// reported) — and the port is dropped to 0, since an agent node has no
+// panel port either. A real address submitted for an agent node is kept
+// verbatim, port included.
+func sanitizeAgentEndpoint(req *NodeMutationRequest, resolved string) {
+	addr := strings.TrimSpace(req.Address)
+	if addr != "" && !isAgentPlaceholderAddress(addr) {
+		return
+	}
+	req.Address = resolved
+	req.Port = 0
+}
+
 func (r *NodeMutationRequest) toNode() *model.Node {
 	n := &model.Node{
 		Id:                  r.Id,