feat: 实现 WebSocket、mochi broker 与下行发布

docs/DEVIATIONS.md

@@ -156,7 +156,42 @@
 
 ## 连接 N
 
-暂无。
+### N1 / N2 2026-09-30
+
+1. **未接线 `cmd/nixmsg`**  
+   - 原条款：serve 最终应挂上端口识别、broker、`/mqtt`。  
+   - 实际做法：本任务只交付 `internal/listener`、`internal/broker`；按总控要求不改 `cmd/nixmsg`。  
+   - 原因：避免与平台/总控并行改 wire 冲突；合并时再接线。  
+   - 备选方案：本分支顺带改 `wire.go`（与指令冲突）。  
+   - 影响：当前 `serve` 仍是 T0.4 的简单 `/healthz` 监听，不含 MQTT。
+
+2. **`listen.addr` / `admin.addr` 仅端口为 0 时写入**  
+   - 原条款：DEVELOPMENT 4.1「端口写 0 时」写地址文件；T0.1 偏差曾改为 always write。  
+   - 实际做法：`listener.Server` 仅当配置地址端口为 `0` 时写 `listen.addr` / `admin.addr`。  
+   - 原因：本任务说明与 DEVELOPMENT 4.1 字面一致；T0.1 的 always write 在 `cmd/nixmsg`，本线未改。  
+   - 备选方案：接线时统一为 always write 以兼容 harness。  
+   - 影响：固定端口场景下 harness 若只读地址文件会读不到；接线时建议沿用 T0.1 超集或改 harness。
+
+3. **登录校验为可替换接口，默认拒绝**  
+   - 原条款：第 5 节完整会话令牌/密码/锁定属 N3。  
+   - 实际做法：`broker.Authenticator` 接口 + 默认 `RejectAuthenticator`；内部错误在 `OnConnect` 返回 error；测试提供 `AllowAuthenticator`。  
+   - 原因：N3 范围；N2 需可跑通装配与钩子。  
+   - 备选方案：N2 内做假登录表（超出范围）。  
+   - 影响：真实端连不上直到 N3；总控接线时注入 Authenticator。
+
+4. **大帧并发名额释放策略**  
+   - 原条款：DEVELOPMENT 7.5 大于 64KiB 全局同时不超过 64；PUBACK / 超时 / 断线释放。  
+   - 实际做法：发布前申请名额；QoS 0 发布成功立即释放；QoS 1 在 `OnQosComplete` 且 payload>64KiB 时释放，断线 `releaseAllLarge`；未单独做「确认超时」计时释放（确认超时属 M 线推送循环）。  
+   - 原因：N2 无投递确认计时器；与 M 线推送超时释放衔接。  
+   - 备选方案：broker 内对大帧自建超时（与 M 重复）。  
+   - 影响：若客户端永不 PUBACK 且不断线，名额可能占满直到断开；M 线超时踢线或回调 Disconnect 可释放。
+
+5. **`OnPublishDropped` 仅打日志**  
+   - 原条款：清「已推送」标记并 1 秒后重推。  
+   - 实际做法：钩子记录 debug 日志；清标记/重推留给消息 M。  
+   - 原因：投递状态在 M/store，N2 无投递表。  
+   - 备选方案：N2 暴露回调给 M 注册。  
+   - 影响：接线后 M 需订阅或包装该钩子；当前接口可后续加 `OnPublishDropped` 回调字段。
 
 ## 消息 M
 

go.mod

@@ -8,11 +8,15 @@ require (
 )
 
 require (
+	github.com/coder/websocket v1.8.14 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/mattn/go-isatty v0.0.24 // indirect
+	github.com/mochi-mqtt/server/v2 v2.7.9 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/rs/xid v1.4.0 // indirect
 	golang.org/x/sys v0.48.0 // indirect
 	modernc.org/libc v1.77.1 // indirect
 	modernc.org/mathutil v1.7.1 // indirect

go.sum

@@ -1,17 +1,25 @@
+github.com/coder/websocket v1.8.14 h1:9L0p0iKiNOibykf283eHkKUHHrpG7f65OE3BhhO7v9g=
+github.com/coder/websocket v1.8.14/go.mod h1:NX3SzP+inril6yawo5CQXx8+fk145lPDC6pumgx0mVg=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/google/pprof v0.0.0-20260802141513-ef3492d7dac3 h1:LMLX+LgTNWpfvCBdFebv6EsYotImrt/Ppc5cXIriCSo=
 github.com/google/pprof v0.0.0-20260802141513-ef3492d7dac3/go.mod h1:jl5iWTm0/hd5PjEYEOuwAJ57L/CibdZfrqZ5XA5GrCk=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/mattn/go-isatty v0.0.24 h1:tGZZoVgT/KiqK1c8ocVLeDS8BSWMRd47J3Lbz7vsReI=
 github.com/mattn/go-isatty v0.0.24/go.mod h1:nMCL3Zebbrt45jsMDgnfIwz6ydEQApk5oEI3HqDio6A=
+github.com/mochi-mqtt/server/v2 v2.7.9 h1:y0g4vrSLAag7T07l2oCzOa/+nKVLoazKEWAArwqBNYI=
+github.com/mochi-mqtt/server/v2 v2.7.9/go.mod h1:lZD3j35AVNqJL5cezlnSkuG05c0FCHSsfAKSPBOSbqc=
 github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
 github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/rs/xid v1.4.0 h1:qd7wPTDkN6KQx2VmMBLrpHkiyQwgFXRnkOLacUiaSNY=
+github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
 go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
 go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
 golang.org/x/mod v0.41.0 h1:qJmnOUb4YB+FsEuM3HcWucdZASCPGhsX6uljO6pog0c=

internal/broker/broker.go

@@ -0,0 +1,379 @@
+package broker
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"log/slog"
+	"net"
+	"sync"
+	"sync/atomic"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+	mqtt "github.com/mochi-mqtt/server/v2"
+	"github.com/mochi-mqtt/server/v2/packets"
+)
+
+const (
+	maxClients           = 2000
+	maxPacketSize        = 786432
+	uplinkQueueSize      = 256
+	largeFrameBytes      = 64 * 1024
+	largeFrameSlots      = 64
+	packetOverheadBudget = 128 // 主题与 MQTT 包头预留
+	keepaliveMin         = 10
+	keepaliveMax         = 600
+)
+
+// ErrPayloadTooLarge 下行超过客户端 Maximum Packet Size（减包头预留）或 max_receive_bytes。
+var ErrPayloadTooLarge = errors.New("broker: payload exceeds client limit")
+
+// ErrNoConnection 目标端没有当前连接。
+var ErrNoConnection = errors.New("broker: no active connection")
+
+// AuthResult 是登录校验结论（N3 实现真实逻辑；N2 默认拒绝）。
+type AuthResult struct {
+	OK           bool
+	SessionToken string // 密码登录成功时由 N3 填写
+}
+
+// Authenticator 由 N3 实现；内部故障必须返回 error，不得当成密码错误。
+type Authenticator interface {
+	Authenticate(ctx context.Context, endpointID string, password []byte, remoteIP string) (AuthResult, error)
+}
+
+// RejectAuthenticator 默认拒绝所有客户端（CONNACK 用户名密码错误）。
+type RejectAuthenticator struct{}
+
+func (RejectAuthenticator) Authenticate(context.Context, string, []byte, string) (AuthResult, error) {
+	return AuthResult{OK: false}, nil
+}
+
+// AllowAuthenticator 测试用：允许任意编号。
+type AllowAuthenticator struct{}
+
+func (AllowAuthenticator) Authenticate(context.Context, string, []byte, string) (AuthResult, error) {
+	return AuthResult{OK: true}, nil
+}
+
+// Options 装配 broker。
+type Options struct {
+	Authenticator Authenticator
+	Uplink        port.UplinkHandler
+	Logger        *slog.Logger
+}
+
+// Broker 内置 mochi，不自带监听端口。
+type Broker struct {
+	server *mqtt.Server
+	auth   Authenticator
+	uplink port.UplinkHandler
+	log    *slog.Logger
+
+	hook *nixHook
+
+	connsMu  sync.RWMutex
+	current  map[string]*connState
+	byClient map[*mqtt.Client]*connState
+
+	queuesMu sync.Mutex
+	queues   map[string]*uplinkQueue
+
+	largeSem chan struct{}
+	closed   atomic.Bool
+}
+
+type connState struct {
+	connID        port.ConnID
+	endpointID    string
+	transport     port.Transport
+	remoteIP      string
+	client        *mqtt.Client
+	maxPacketSize uint32
+	maxRecvBytes  int
+	authOK        bool
+	authErr       error
+	sessionToken  string
+	largeHeld     int
+	mu            sync.Mutex
+}
+
+// New 创建并 Serve mochi（无监听器）。
+func New(opts Options) (*Broker, error) {
+	auth := opts.Authenticator
+	if auth == nil {
+		auth = RejectAuthenticator{}
+	}
+	uplink := opts.Uplink
+	if uplink == nil {
+		uplink = port.StubUplinkHandler{}
+	}
+	log := opts.Logger
+	if log == nil {
+		log = slog.Default()
+	}
+
+	caps := mqtt.NewDefaultServerCapabilities()
+	caps.MaximumClients = maxClients
+	caps.MaximumQos = 1
+	caps.MaximumPacketSize = maxPacketSize
+	caps.MaximumSessionExpiryInterval = 0
+	caps.ReceiveMaximum = 1024
+	caps.MaximumInflight = 1024
+	caps.MaximumClientWritesPending = 1024
+	caps.RetainAvailable = 0
+	caps.WildcardSubAvailable = 0
+	caps.SharedSubAvailable = 0
+	caps.TopicAliasMaximum = 0
+	caps.Compatibilities.ObscureNotAuthorized = true
+
+	srv := mqtt.New(&mqtt.Options{
+		InlineClient: true,
+		Capabilities: caps,
+		Logger:       log,
+	})
+
+	b := &Broker{
+		server:   srv,
+		auth:     auth,
+		uplink:   uplink,
+		log:      log,
+		current:  make(map[string]*connState),
+		byClient: make(map[*mqtt.Client]*connState),
+		queues:   make(map[string]*uplinkQueue),
+		largeSem: make(chan struct{}, largeFrameSlots),
+	}
+	b.hook = &nixHook{b: b}
+	if err := srv.AddHook(b.hook, nil); err != nil {
+		return nil, err
+	}
+	if err := srv.Serve(); err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+// Server 返回底层 mochi（测试用）。
+func (b *Broker) Server() *mqtt.Server { return b.server }
+
+// Close 关闭 broker。
+func (b *Broker) Close() error {
+	if b.closed.Swap(true) {
+		return nil
+	}
+	b.queuesMu.Lock()
+	for _, q := range b.queues {
+		q.close()
+	}
+	b.queuesMu.Unlock()
+	return b.server.Close()
+}
+
+// AttachTCP 把裸 TCP/TLS 连接交给 mochi；阻塞到连接结束。
+func (b *Broker) AttachTCP(conn net.Conn) error {
+	return b.server.EstablishConnection("tcp", conn)
+}
+
+// AttachWS 把 WebSocket NetConn 交给 mochi；阻塞到连接结束。
+func (b *Broker) AttachWS(conn net.Conn) error {
+	return b.server.EstablishConnection("ws", conn)
+}
+
+// PublishDown 实现 port.Downlink。
+func (b *Broker) PublishDown(ctx context.Context, endpointID string, connID port.ConnID, payload []byte, opts port.PublishOpts) error {
+	if b.closed.Load() {
+		return errors.New("broker: closed")
+	}
+	st := b.lookupConn(endpointID, connID)
+	if st == nil {
+		return ErrNoConnection
+	}
+
+	limit := effectivePayloadLimit(st.maxPacketSize, st.maxRecvBytes)
+	if limit > 0 && len(payload) > limit {
+		return ErrPayloadTooLarge
+	}
+
+	qos := opts.QoS
+	if qos > 1 {
+		qos = 1
+	}
+	topic := downTopic(endpointID)
+	large := len(payload) > largeFrameBytes
+
+	if large {
+		select {
+		case b.largeSem <- struct{}{}:
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+		st.mu.Lock()
+		st.largeHeld++
+		st.mu.Unlock()
+	}
+
+	if err := b.server.Publish(topic, payload, false, qos); err != nil {
+		if large {
+			b.releaseOneLarge(st)
+		}
+		return err
+	}
+	if large && qos == 0 {
+		b.releaseOneLarge(st)
+	}
+	return nil
+}
+
+func (b *Broker) releaseOneLarge(st *connState) {
+	st.mu.Lock()
+	if st.largeHeld > 0 {
+		st.largeHeld--
+		st.mu.Unlock()
+		select {
+		case <-b.largeSem:
+		default:
+		}
+		return
+	}
+	st.mu.Unlock()
+}
+
+func (b *Broker) releaseAllLarge(st *connState) {
+	st.mu.Lock()
+	n := st.largeHeld
+	st.largeHeld = 0
+	st.mu.Unlock()
+	for i := 0; i < n; i++ {
+		select {
+		case <-b.largeSem:
+		default:
+		}
+	}
+}
+
+// Disconnect 实现 port.ConnControl。
+func (b *Broker) Disconnect(_ context.Context, endpointID string, connID port.ConnID, reason port.DisconnectReason) error {
+	st := b.lookupConn(endpointID, connID)
+	if st == nil {
+		return ErrNoConnection
+	}
+	code := packets.CodeDisconnect
+	switch reason {
+	case port.DisconnectTakenOver:
+		code = packets.ErrSessionTakenOver
+	case port.DisconnectKicked, port.DisconnectFatal:
+		code = packets.ErrAdministrativeAction
+	}
+	return b.server.DisconnectClient(st.client, code)
+}
+
+func (b *Broker) lookupConn(endpointID string, connID port.ConnID) *connState {
+	b.connsMu.RLock()
+	defer b.connsMu.RUnlock()
+	if connID != "" {
+		for _, st := range b.byClient {
+			if st.endpointID == endpointID && st.connID == connID {
+				return st
+			}
+		}
+		return nil
+	}
+	return b.current[endpointID]
+}
+
+func downTopic(endpointID string) string {
+	return "nix/c/" + endpointID + "/down"
+}
+
+func upTopic(endpointID string) string {
+	return "nix/c/" + endpointID + "/up"
+}
+
+func effectivePayloadLimit(maxPacketSize uint32, maxRecvBytes int) int {
+	limit := 0
+	if maxPacketSize > 0 {
+		if maxPacketSize > packetOverheadBudget {
+			limit = int(maxPacketSize) - packetOverheadBudget
+		}
+	}
+	if maxRecvBytes > 0 {
+		if limit == 0 || maxRecvBytes < limit {
+			limit = maxRecvBytes
+		}
+	}
+	return limit
+}
+
+func randomConnID() port.ConnID {
+	var b [16]byte
+	_, _ = rand.Read(b[:])
+	return port.ConnID(hex.EncodeToString(b[:]))
+}
+
+func transportOf(cl *mqtt.Client) port.Transport {
+	if cl != nil && cl.Net.Listener == "ws" {
+		return port.TransportWS
+	}
+	return port.TransportTCP
+}
+
+func remoteIPOf(cl *mqtt.Client) string {
+	if cl == nil {
+		return ""
+	}
+	addr := cl.Net.Remote
+	if addr == "" && cl.Net.Conn != nil && cl.Net.Conn.RemoteAddr() != nil {
+		addr = cl.Net.Conn.RemoteAddr().String()
+	}
+	host, _, err := net.SplitHostPort(addr)
+	if err != nil {
+		return addr
+	}
+	return host
+}
+
+// SetMaxReceiveBytes 供 N3 握手后设置；0 表示不限。
+func (b *Broker) SetMaxReceiveBytes(endpointID string, connID port.ConnID, n int) {
+	st := b.lookupConn(endpointID, connID)
+	if st == nil {
+		return
+	}
+	st.mu.Lock()
+	st.maxRecvBytes = n
+	st.mu.Unlock()
+}
+
+// ConnInfoOf 返回连接信息（测试/N3）。
+func (b *Broker) ConnInfoOf(endpointID string) (port.ConnInfo, bool) {
+	b.connsMu.RLock()
+	st := b.current[endpointID]
+	b.connsMu.RUnlock()
+	if st == nil {
+		return port.ConnInfo{}, false
+	}
+	return port.ConnInfo{
+		ConnID:        st.connID,
+		EndpointID:    st.endpointID,
+		Transport:     st.transport,
+		RemoteIP:      st.remoteIP,
+		SessionToken:  st.sessionToken,
+		MaxPacketSize: st.maxPacketSize,
+	}, true
+}
+
+func (b *Broker) enqueueUplink(endpointID string, conn port.ConnInfo, payload []byte) {
+	b.queuesMu.Lock()
+	q, ok := b.queues[endpointID]
+	if !ok {
+		q = newUplinkQueue(b, endpointID)
+		b.queues[endpointID] = q
+	}
+	b.queuesMu.Unlock()
+	q.push(uplinkItem{conn: conn, payload: payload})
+}
+
+var (
+	_ port.Downlink    = (*Broker)(nil)
+	_ port.ConnControl = (*Broker)(nil)
+)

internal/broker/broker_test.go

@@ -0,0 +1,259 @@
+package broker
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"testing"
+	"time"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+	"github.com/coder/websocket"
+	"github.com/mochi-mqtt/server/v2/packets"
+)
+
+func TestWSCrossOriginAllowed(t *testing.T) {
+	b, err := New(Options{Authenticator: AllowAuthenticator{}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	mux := http.NewServeMux()
+	mux.Handle("/mqtt", b.WSHandler(nil))
+	srv := httptest.NewServer(mux)
+	defer srv.Close()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	c, _, err := websocket.Dial(ctx, "ws"+srv.URL[len("http"):]+"/mqtt", &websocket.DialOptions{
+		HTTPHeader:   http.Header{"Origin": []string{"https://other.example"}},
+		Subprotocols: []string{"mqtt"},
+	})
+	if err != nil {
+		t.Fatalf("cross-origin dial: %v", err)
+	}
+	defer func() { _ = c.Close(websocket.StatusNormalClosure, "") }()
+	if c.Subprotocol() != "mqtt" {
+		t.Fatalf("subprotocol=%q", c.Subprotocol())
+	}
+}
+
+func TestWSWrongSubprotocolClosed(t *testing.T) {
+	b, err := New(Options{Authenticator: AllowAuthenticator{}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	mux := http.NewServeMux()
+	mux.Handle("/mqtt", b.WSHandler(nil))
+	srv := httptest.NewServer(mux)
+	defer srv.Close()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	c, _, err := websocket.Dial(ctx, "ws"+srv.URL[len("http"):]+"/mqtt", &websocket.DialOptions{
+		HTTPHeader:   http.Header{"Origin": []string{"https://other.example"}},
+		Subprotocols: []string{"not-mqtt"},
+	})
+	if err != nil {
+		// 有的实现在握手阶段就失败；也算关闭
+		return
+	}
+	defer func() { _ = c.Close(websocket.StatusNormalClosure, "") }()
+
+	// 服务端应立刻关掉；后续读写会失败
+	c.SetReadLimit(16)
+	_, _, readErr := c.Read(ctx)
+	if readErr == nil {
+		t.Fatal("expected connection closed for wrong subprotocol")
+	}
+}
+
+func TestPublishDownExceedsClientMax(t *testing.T) {
+	b, err := New(Options{Authenticator: AllowAuthenticator{}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	clientDone := make(chan struct{})
+	r, w := net.Pipe()
+	go func() {
+		defer close(clientDone)
+		_ = b.AttachTCP(r)
+	}()
+
+	endpoint := "ep-limit"
+	connectAndSubscribe(t, w, endpoint, 200) // MaximumPacketSize=200 → payload limit 72
+
+	// 等会话建立
+	deadline := time.Now().Add(3 * time.Second)
+	for {
+		if _, ok := b.ConnInfoOf(endpoint); ok {
+			break
+		}
+		if time.Now().After(deadline) {
+			t.Fatal("session not established")
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+
+	big := bytes.Repeat([]byte("x"), 100) // > 200-128
+	pubErr := b.PublishDown(context.Background(), endpoint, "", big, port.PublishOpts{QoS: 1})
+	if !errors.Is(pubErr, ErrPayloadTooLarge) {
+		t.Fatalf("PublishDown err=%v want ErrPayloadTooLarge", pubErr)
+	}
+
+	// 合法大小应成功
+	small := []byte(`{"v":1,"type":"resp"}`)
+	if err := b.PublishDown(context.Background(), endpoint, "", small, port.PublishOpts{QoS: 0}); err != nil {
+		t.Fatalf("small publish: %v", err)
+	}
+
+	_ = w.Close()
+	select {
+	case <-clientDone:
+	case <-time.After(3 * time.Second):
+	}
+}
+
+func TestInternalAuthErrorDoesNotReturnBadPassword(t *testing.T) {
+	auth := &errAuthenticator{err: context.DeadlineExceeded}
+	b, err := New(Options{Authenticator: auth})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	r, w := net.Pipe()
+	errCh := make(chan error, 1)
+	go func() { errCh <- b.AttachTCP(r) }()
+
+	writeConnect(t, w, "ep-err", 30, 0)
+	// 不应收到 CONNACK（内部错误直接断开）
+	_ = w.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
+	buf := make([]byte, 64)
+	n, readErr := w.Read(buf)
+	if readErr == nil && n > 0 {
+		// 若收到包，不能是 bad username/password CONNACK (reason 0x86)
+		if n >= 2 && buf[0]>>4 == packets.Connack {
+			t.Fatalf("unexpected connack on internal error: %x", buf[:n])
+		}
+	}
+	_ = w.Close()
+	select {
+	case <-errCh:
+	case <-time.After(2 * time.Second):
+	}
+}
+
+func TestRejectUnknownByDefault(t *testing.T) {
+	b, err := New(Options{}) // RejectAuthenticator
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	r, w := net.Pipe()
+	go func() { _ = b.AttachTCP(r) }()
+	writeConnect(t, w, "ep-unknown", 30, 0)
+	_ = w.SetReadDeadline(time.Now().Add(2 * time.Second))
+	buf := make([]byte, 128)
+	n, err := io.ReadAtLeast(w, buf, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if buf[0]>>4 != packets.Connack {
+		t.Fatalf("want connack, got %x", buf[:n])
+	}
+	_ = w.Close()
+}
+
+type errAuthenticator struct {
+	err error
+	mu  sync.Mutex
+}
+
+func (a *errAuthenticator) Authenticate(context.Context, string, []byte, string) (AuthResult, error) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	return AuthResult{}, a.err
+}
+
+func connectAndSubscribe(t *testing.T, w net.Conn, endpoint string, maxPacket uint32) {
+	t.Helper()
+	writeConnect(t, w, endpoint, 30, maxPacket)
+	// read CONNACK
+	_ = w.SetReadDeadline(time.Now().Add(3 * time.Second))
+	buf := make([]byte, 256)
+	n, err := io.ReadAtLeast(w, buf, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if buf[0]>>4 != packets.Connack {
+		t.Fatalf("want connack got %x", buf[:n])
+	}
+	writeSubscribe(t, w, downTopic(endpoint))
+	// read SUBACK
+	n, err = io.ReadAtLeast(w, buf, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if buf[0]>>4 != packets.Suback {
+		t.Fatalf("want suback got %x", buf[:n])
+	}
+}
+
+func writeConnect(t *testing.T, w net.Conn, endpoint string, keepalive uint16, maxPacket uint32) {
+	t.Helper()
+	pk := packets.Packet{
+		FixedHeader:     packets.FixedHeader{Type: packets.Connect},
+		ProtocolVersion: 5,
+		Connect: packets.ConnectParams{
+			ProtocolName:     []byte("MQTT"),
+			Clean:            true,
+			ClientIdentifier: endpoint,
+			Keepalive:        keepalive,
+			UsernameFlag:     true,
+			Username:         []byte(endpoint),
+			PasswordFlag:     true,
+			Password:         []byte("test"),
+		},
+		Properties: packets.Properties{
+			MaximumPacketSize: maxPacket,
+		},
+	}
+	var buf bytes.Buffer
+	if err := pk.ConnectEncode(&buf); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := w.Write(buf.Bytes()); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func writeSubscribe(t *testing.T, w net.Conn, topic string) {
+	t.Helper()
+	pk := packets.Packet{
+		FixedHeader:     packets.FixedHeader{Type: packets.Subscribe, Qos: 1},
+		ProtocolVersion: 5,
+		PacketID:        1,
+		Filters: packets.Subscriptions{
+			{Filter: topic, Qos: 1},
+		},
+	}
+	var buf bytes.Buffer
+	if err := pk.SubscribeEncode(&buf); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := w.Write(buf.Bytes()); err != nil {
+		t.Fatal(err)
+	}
+}

internal/broker/hooks.go

@@ -0,0 +1,196 @@
+package broker
+
+import (
+	"bytes"
+	"context"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+	mqtt "github.com/mochi-mqtt/server/v2"
+	"github.com/mochi-mqtt/server/v2/packets"
+)
+
+type nixHook struct {
+	mqtt.HookBase
+	b *Broker
+}
+
+func (h *nixHook) ID() string { return "nixmsg" }
+
+func (h *nixHook) Provides(b byte) bool {
+	return bytes.Contains([]byte{
+		mqtt.OnConnect,
+		mqtt.OnConnectAuthenticate,
+		mqtt.OnACLCheck,
+		mqtt.OnPublish,
+		mqtt.OnPublishDropped,
+		mqtt.OnSessionEstablished,
+		mqtt.OnDisconnect,
+		mqtt.OnQosComplete,
+	}, []byte{b})
+}
+
+func (h *nixHook) OnConnect(cl *mqtt.Client, pk packets.Packet) error {
+	endpointID := string(pk.Connect.Username)
+	if endpointID == "" {
+		endpointID = pk.Connect.ClientIdentifier
+	}
+	remoteIP := remoteIPOf(cl)
+
+	st := &connState{
+		connID:        randomConnID(),
+		endpointID:    endpointID,
+		transport:     transportOf(cl),
+		remoteIP:      remoteIP,
+		client:        cl,
+		maxPacketSize: pk.Properties.MaximumPacketSize,
+	}
+
+	// 心跳校正：超出 10–600 秒就改写 Keepalive 并设 ServerKeepalive
+	ka := pk.Connect.Keepalive
+	if ka < keepaliveMin || ka > keepaliveMax {
+		if ka < keepaliveMin {
+			ka = keepaliveMin
+		}
+		if ka > keepaliveMax {
+			ka = keepaliveMax
+		}
+		cl.State.Keepalive = ka
+		cl.State.ServerKeepalive = true
+	}
+
+	res, err := h.b.auth.Authenticate(context.Background(), endpointID, pk.Connect.Password, remoteIP)
+	if err != nil {
+		st.authErr = err
+		h.rememberPending(cl, st)
+		return err // mochi 不回 CONNACK，直接断开
+	}
+	st.authOK = res.OK
+	st.sessionToken = res.SessionToken
+	h.rememberPending(cl, st)
+	return nil
+}
+
+func (h *nixHook) rememberPending(cl *mqtt.Client, st *connState) {
+	h.b.connsMu.Lock()
+	h.b.byClient[cl] = st
+	h.b.connsMu.Unlock()
+}
+
+func (h *nixHook) OnConnectAuthenticate(cl *mqtt.Client, _ packets.Packet) bool {
+	h.b.connsMu.RLock()
+	st := h.b.byClient[cl]
+	h.b.connsMu.RUnlock()
+	if st == nil {
+		return false
+	}
+	// 内部故障已在 OnConnect 返回 error；此处只反映业务上的拒绝
+	return st.authOK
+}
+
+func (h *nixHook) OnACLCheck(cl *mqtt.Client, topic string, write bool) bool {
+	h.b.connsMu.RLock()
+	st := h.b.byClient[cl]
+	h.b.connsMu.RUnlock()
+	if st == nil || st.endpointID == "" {
+		return false
+	}
+	up := upTopic(st.endpointID)
+	down := downTopic(st.endpointID)
+	if write {
+		return topic == up
+	}
+	return topic == down
+}
+
+func (h *nixHook) OnPublish(cl *mqtt.Client, pk packets.Packet) (packets.Packet, error) {
+	h.b.connsMu.RLock()
+	st := h.b.byClient[cl]
+	h.b.connsMu.RUnlock()
+	if st == nil {
+		return pk, packets.CodeSuccessIgnore
+	}
+	payload := append([]byte(nil), pk.Payload...)
+	info := port.ConnInfo{
+		ConnID:        st.connID,
+		EndpointID:    st.endpointID,
+		Transport:     st.transport,
+		RemoteIP:      st.remoteIP,
+		SessionToken:  st.sessionToken,
+		MaxPacketSize: st.maxPacketSize,
+	}
+	h.b.enqueueUplink(st.endpointID, info, payload)
+	return pk, packets.CodeSuccessIgnore
+}
+
+func (h *nixHook) OnPublishDropped(cl *mqtt.Client, pk packets.Packet) {
+	h.b.log.Debug("publish dropped", "client", cl.ID, "topic", pk.TopicName, "size", len(pk.Payload))
+}
+
+func (h *nixHook) OnSessionEstablished(cl *mqtt.Client, _ packets.Packet) {
+	h.b.connsMu.Lock()
+	st := h.b.byClient[cl]
+	if st != nil {
+		h.b.current[st.endpointID] = st
+	}
+	h.b.connsMu.Unlock()
+	if st == nil {
+		return
+	}
+	info := port.ConnInfo{
+		ConnID:        st.connID,
+		EndpointID:    st.endpointID,
+		Transport:     st.transport,
+		RemoteIP:      st.remoteIP,
+		SessionToken:  st.sessionToken,
+		MaxPacketSize: st.maxPacketSize,
+	}
+	_ = h.b.uplink.OnSessionEstablished(context.Background(), info)
+}
+
+func (h *nixHook) OnDisconnect(cl *mqtt.Client, err error, _ bool) {
+	h.b.connsMu.Lock()
+	st := h.b.byClient[cl]
+	delete(h.b.byClient, cl)
+	if st != nil && h.b.current[st.endpointID] == st {
+		delete(h.b.current, st.endpointID)
+	}
+	h.b.connsMu.Unlock()
+	if st == nil {
+		return
+	}
+	h.b.releaseAllLarge(st)
+
+	reason := port.DisconnectNormal
+	if err != nil {
+		if code, ok := err.(packets.Code); ok {
+			switch code.Code {
+			case packets.ErrSessionTakenOver.Code:
+				reason = port.DisconnectTakenOver
+			case packets.ErrAdministrativeAction.Code:
+				reason = port.DisconnectKicked
+			}
+		}
+	}
+	info := port.ConnInfo{
+		ConnID:        st.connID,
+		EndpointID:    st.endpointID,
+		Transport:     st.transport,
+		RemoteIP:      st.remoteIP,
+		SessionToken:  st.sessionToken,
+		MaxPacketSize: st.maxPacketSize,
+	}
+	h.b.uplink.OnDisconnect(context.Background(), info, reason)
+}
+
+func (h *nixHook) OnQosComplete(cl *mqtt.Client, pk packets.Packet) {
+	if len(pk.Payload) <= largeFrameBytes {
+		return
+	}
+	h.b.connsMu.RLock()
+	st := h.b.byClient[cl]
+	h.b.connsMu.RUnlock()
+	if st == nil {
+		return
+	}
+	h.b.releaseOneLarge(st)
+}

internal/broker/queue.go

@@ -0,0 +1,45 @@
+package broker
+
+import (
+	"context"
+	"sync"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+)
+
+type uplinkItem struct {
+	conn    port.ConnInfo
+	payload []byte
+}
+
+// uplinkQueue 每端串行队列，长度 256，满了堵住 OnPublish（背压）。
+type uplinkQueue struct {
+	b          *Broker
+	endpointID string
+	ch         chan uplinkItem
+	once       sync.Once
+}
+
+func newUplinkQueue(b *Broker, endpointID string) *uplinkQueue {
+	q := &uplinkQueue{
+		b:          b,
+		endpointID: endpointID,
+		ch:         make(chan uplinkItem, uplinkQueueSize),
+	}
+	go q.loop()
+	return q
+}
+
+func (q *uplinkQueue) push(item uplinkItem) {
+	q.ch <- item // 满则阻塞读循环，形成背压
+}
+
+func (q *uplinkQueue) close() {
+	q.once.Do(func() { close(q.ch) })
+}
+
+func (q *uplinkQueue) loop() {
+	for item := range q.ch {
+		_ = q.b.uplink.HandleUplink(context.Background(), item.conn, item.payload)
+	}
+}

internal/broker/ws.go

@@ -0,0 +1,41 @@
+package broker
+
+import (
+	"context"
+	"net"
+	"net/http"
+
+	"git.asio.asia/nixevol/NixMsg/internal/listener"
+	"github.com/coder/websocket"
+)
+
+// WSHandler 返回 /mqtt 的 WebSocket 升级处理。
+// Accept 时 InsecureSkipVerify=true；之后检查 Subprotocol==mqtt。
+// NetConn 使用 Background 派生的 context，不用请求 Context。
+func (b *Broker) WSHandler(proxies *listener.ProxySet) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		c, err := websocket.Accept(w, r, &websocket.AcceptOptions{
+			Subprotocols:       []string{"mqtt"},
+			InsecureSkipVerify: true,
+		})
+		if err != nil {
+			return
+		}
+		if c.Subprotocol() != "mqtt" {
+			_ = c.Close(websocket.StatusPolicyViolation, "subprotocol must be mqtt")
+			return
+		}
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		nc := websocket.NetConn(ctx, c, websocket.MessageBinary)
+		if proxies != nil {
+			ip := proxies.ClientIP(r)
+			if ip != "" {
+				nc = listener.WithRemoteAddr(nc, &net.TCPAddr{IP: net.ParseIP(ip)})
+			}
+		}
+		_ = b.AttachWS(nc)
+	})
+}

internal/listener/chanlistener.go

@@ -0,0 +1,62 @@
+package listener
+
+import (
+	"net"
+	"sync"
+)
+
+// ChanListener 是从通道取连接的 net.Listener，交给同一个 http.Server。
+type ChanListener struct {
+	addr   net.Addr
+	ch     chan net.Conn
+	closed chan struct{}
+	once   sync.Once
+}
+
+// NewChanListener 创建缓冲通道监听器；addr 仅用于 Addr()。
+func NewChanListener(addr net.Addr, buf int) *ChanListener {
+	if buf < 1 {
+		buf = 64
+	}
+	if addr == nil {
+		addr = &net.TCPAddr{IP: net.IPv4zero, Port: 0}
+	}
+	return &ChanListener{
+		addr:   addr,
+		ch:     make(chan net.Conn, buf),
+		closed: make(chan struct{}),
+	}
+}
+
+// Addr 返回构造时给出的地址。
+func (l *ChanListener) Addr() net.Addr { return l.addr }
+
+// Accept 阻塞直到有连接或关闭。
+func (l *ChanListener) Accept() (net.Conn, error) {
+	select {
+	case <-l.closed:
+		return nil, net.ErrClosed
+	case c, ok := <-l.ch:
+		if !ok {
+			return nil, net.ErrClosed
+		}
+		return c, nil
+	}
+}
+
+// Close 关闭监听器并唤醒 Accept。
+func (l *ChanListener) Close() error {
+	l.once.Do(func() {
+		close(l.closed)
+	})
+	return nil
+}
+
+// Enqueue 把识别为 HTTP 的连接交给 http.Server；已关闭时丢弃并关闭连接。
+func (l *ChanListener) Enqueue(c net.Conn) {
+	select {
+	case <-l.closed:
+		_ = c.Close()
+	case l.ch <- c:
+	}
+}

internal/listener/conn.go

@@ -0,0 +1,76 @@
+package listener
+
+import (
+	"bufio"
+	"net"
+	"strconv"
+	"time"
+)
+
+const firstByteTimeout = 10 * time.Second
+
+// bufferedConn 把已读字节放回连接，供后续 TLS/HTTP/MQTT 继续读。
+type bufferedConn struct {
+	net.Conn
+	r *bufio.Reader
+}
+
+func (c *bufferedConn) Read(p []byte) (int, error) {
+	return c.r.Read(p)
+}
+
+func wrapBuffered(c net.Conn) *bufferedConn {
+	if bc, ok := c.(*bufferedConn); ok {
+		return bc
+	}
+	return &bufferedConn{Conn: c, r: bufio.NewReader(c)}
+}
+
+// peekFirstByte 在超时内读首字节并 Unread，返回仍可读完整流的连接。
+func peekFirstByte(c net.Conn) (net.Conn, byte, error) {
+	bc := wrapBuffered(c)
+	_ = bc.SetReadDeadline(time.Now().Add(firstByteTimeout))
+	b, err := bc.r.ReadByte()
+	_ = bc.SetReadDeadline(time.Time{})
+	if err != nil {
+		return nil, 0, err
+	}
+	if err := bc.r.UnreadByte(); err != nil {
+		return nil, 0, err
+	}
+	return bc, b, nil
+}
+
+// addrConn 只改 RemoteAddr，用于受信任代理后的真实 IP。
+type addrConn struct {
+	net.Conn
+	remote net.Addr
+}
+
+func (c *addrConn) RemoteAddr() net.Addr {
+	if c.remote != nil {
+		return c.remote
+	}
+	return c.Conn.RemoteAddr()
+}
+
+// WithRemoteAddr 包装连接，使 RemoteAddr 返回指定地址（通常是解析出的客户端 IP）。
+func WithRemoteAddr(c net.Conn, remote net.Addr) net.Conn {
+	if remote == nil {
+		return c
+	}
+	return &addrConn{Conn: c, remote: remote}
+}
+
+// TCPAddrFromIPPort 把 "ip:port" 或纯 IP 转成 *net.TCPAddr。
+func TCPAddrFromIPPort(ipPort string) *net.TCPAddr {
+	if ipPort == "" {
+		return &net.TCPAddr{}
+	}
+	host, portStr, err := net.SplitHostPort(ipPort)
+	if err != nil {
+		return &net.TCPAddr{IP: net.ParseIP(ipPort)}
+	}
+	port, _ := strconv.Atoi(portStr)
+	return &net.TCPAddr{IP: net.ParseIP(host), Port: port}
+}

internal/listener/listener_test.go

@@ -0,0 +1,398 @@
+package listener
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"io"
+	"math/big"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestIdentifyPlainHTTPAndMQTT(t *testing.T) {
+	dir := t.TempDir()
+	gotMQTT := make(chan net.Conn, 1)
+	mux := NewMux(RoleShared, Handlers{
+		Healthz: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			w.WriteHeader(http.StatusOK)
+			_, _ = w.Write([]byte("ok"))
+		}),
+	})
+	s, err := New(Options{
+		Listen:         "127.0.0.1:0",
+		DataDir:        dir,
+		ClientHandler:  mux,
+		AllowPlaintext: true,
+		OnMQTT: func(c net.Conn) {
+			gotMQTT <- c
+			buf := make([]byte, 1)
+			_, _ = c.Read(buf)
+			_ = c.Close()
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if startErr := s.Start(ctx); startErr != nil {
+		t.Fatal(startErr)
+	}
+	defer func() { _ = s.Close() }()
+
+	addr := s.ListenAddr()
+	if addr == "" {
+		t.Fatal("empty listen addr")
+	}
+	b, err := os.ReadFile(filepath.Join(dir, "listen.addr"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(b) != addr+"\n" {
+		t.Fatalf("listen.addr=%q want %q", b, addr+"\n")
+	}
+
+	resp, err := http.Get("http://" + addr + "/healthz")
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, _ := io.ReadAll(resp.Body)
+	_ = resp.Body.Close()
+	if resp.StatusCode != 200 || string(body) != "ok" {
+		t.Fatalf("healthz: %d %q", resp.StatusCode, body)
+	}
+
+	c, err := net.DialTimeout("tcp", addr, 2*time.Second)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, _ = c.Write([]byte{0x10, 0x00})
+	select {
+	case mc := <-gotMQTT:
+		_ = mc.Close()
+	case <-time.After(3 * time.Second):
+		t.Fatal("mqtt not delivered")
+	}
+	_ = c.Close()
+}
+
+func TestIdentifyTLSHTTPAndMQTT(t *testing.T) {
+	dir := t.TempDir()
+	certPath, keyPath := writeTestCert(t, dir, "old")
+	gotMQTT := make(chan net.Conn, 1)
+	mux := NewMux(RoleShared, Handlers{
+		Healthz: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			_, _ = w.Write([]byte("tls-ok"))
+		}),
+	})
+	s, err := New(Options{
+		Listen:         "127.0.0.1:0",
+		DataDir:        dir,
+		CertFile:       certPath,
+		KeyFile:        keyPath,
+		AllowPlaintext: false,
+		ClientHandler:  mux,
+		OnMQTT: func(c net.Conn) {
+			gotMQTT <- c
+			_ = c.Close()
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if startErr := s.Start(ctx); startErr != nil {
+		t.Fatal(startErr)
+	}
+	defer func() { _ = s.Close() }()
+
+	addr := s.ListenAddr()
+	tlsCfg := &tls.Config{InsecureSkipVerify: true}
+
+	// TLS + HTTP
+	tr := &http.Transport{TLSClientConfig: tlsCfg}
+	client := &http.Client{Transport: tr, Timeout: 5 * time.Second}
+	resp, err := client.Get("https://" + addr + "/healthz")
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, _ := io.ReadAll(resp.Body)
+	_ = resp.Body.Close()
+	if string(body) != "tls-ok" {
+		t.Fatalf("body=%q", body)
+	}
+
+	// TLS + MQTT (0x10 after handshake)
+	raw, err := tls.Dial("tcp", addr, tlsCfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, _ = raw.Write([]byte{0x10})
+	select {
+	case mc := <-gotMQTT:
+		_ = mc.Close()
+	case <-time.After(3 * time.Second):
+		t.Fatal("tls mqtt not delivered")
+	}
+	_ = raw.Close()
+
+	// ALPN mqtt 客户端仍能握手（服务端不设 NextProtos）
+	alpn, err := tls.Dial("tcp", addr, &tls.Config{
+		InsecureSkipVerify: true,
+		NextProtos:         []string{"mqtt"},
+	})
+	if err != nil {
+		t.Fatalf("alpn mqtt handshake: %v", err)
+	}
+	_ = alpn.Close()
+}
+
+func TestCertReloadUsesNewCert(t *testing.T) {
+	dir := t.TempDir()
+	certPath, keyPath := writeTestCert(t, dir, "v1")
+	cr, err := NewCertReloader(certPath, keyPath, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer cr.Close()
+	old := cr.Certificate()
+	if old == nil {
+		t.Fatal("nil cert")
+	}
+
+	time.Sleep(20 * time.Millisecond) // 保证 mtime 变化
+	certPath2, keyPath2 := writeTestCert(t, dir, "v2")
+	// 覆盖原路径
+	data, _ := os.ReadFile(certPath2)
+	_ = os.WriteFile(certPath, data, 0o644)
+	data, _ = os.ReadFile(keyPath2)
+	_ = os.WriteFile(keyPath, data, 0o644)
+
+	if reloadErr := cr.ReloadNow(); reloadErr != nil {
+		t.Fatal(reloadErr)
+	}
+	neu := cr.Certificate()
+	if neu == nil || neu == old {
+		t.Fatal("certificate not reloaded")
+	}
+
+	// 完整服务：重载后新连接用新证书（用 Leaf CN 区分）
+	mux := NewMux(RoleShared, Handlers{})
+	s, err := New(Options{
+		Listen:        "127.0.0.1:0",
+		DataDir:       dir,
+		CertFile:      certPath,
+		KeyFile:       keyPath,
+		ClientHandler: mux,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if startErr := s.Start(ctx); startErr != nil {
+		t.Fatal(startErr)
+	}
+	defer func() { _ = s.Close() }()
+
+	// 再换一版证书
+	time.Sleep(20 * time.Millisecond)
+	c3, k3 := writeTestCert(t, dir, "v3")
+	data, _ = os.ReadFile(c3)
+	_ = os.WriteFile(certPath, data, 0o644)
+	data, _ = os.ReadFile(k3)
+	_ = os.WriteFile(keyPath, data, 0o644)
+	if reloadErr := s.certs.ReloadNow(); reloadErr != nil {
+		t.Fatal(reloadErr)
+	}
+
+	conn, err := tls.Dial("tcp", s.ListenAddr(), &tls.Config{InsecureSkipVerify: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = conn.Close() }()
+	state := conn.ConnectionState()
+	if len(state.PeerCertificates) == 0 {
+		t.Fatal("no peer cert")
+	}
+	if cn := state.PeerCertificates[0].Subject.CommonName; cn != "v3" {
+		t.Fatalf("cn=%q want v3", cn)
+	}
+}
+
+func TestAdminSeparateMQTTClosedAndAdmin404OnListen(t *testing.T) {
+	dir := t.TempDir()
+	clientMux := NewMux(RoleClient, Handlers{
+		Healthz: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			_, _ = w.Write([]byte("client"))
+		}),
+	})
+	adminMux := NewMux(RoleAdmin, Handlers{
+		AdminAPI: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			_, _ = w.Write([]byte("admin"))
+		}),
+		Healthz: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			_, _ = w.Write([]byte("admin-health"))
+		}),
+	})
+	mqttSeen := make(chan struct{}, 1)
+	s, err := New(Options{
+		Listen:         "127.0.0.1:0",
+		AdminListen:    "127.0.0.1:0",
+		DataDir:        dir,
+		AllowPlaintext: true,
+		ClientHandler:  clientMux,
+		AdminHandler:   adminMux,
+		OnMQTT: func(c net.Conn) {
+			mqttSeen <- struct{}{}
+			_ = c.Close()
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if startErr := s.Start(ctx); startErr != nil {
+		t.Fatal(startErr)
+	}
+	defer func() { _ = s.Close() }()
+
+	// listen 上 /api/admin/ 404
+	resp, err := http.Get("http://" + s.ListenAddr() + "/api/admin/x")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = resp.Body.Close()
+	if resp.StatusCode != 404 {
+		t.Fatalf("listen admin status=%d", resp.StatusCode)
+	}
+
+	// admin 上 API 可用
+	resp, err = http.Get("http://" + s.AdminAddr() + "/api/admin/x")
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, _ := io.ReadAll(resp.Body)
+	_ = resp.Body.Close()
+	if string(body) != "admin" {
+		t.Fatalf("admin body=%q", body)
+	}
+
+	// admin_listen 上裸 MQTT 关闭，不回调
+	ac, err := net.DialTimeout("tcp", s.AdminAddr(), 2*time.Second)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, _ = ac.Write([]byte{0x10})
+	time.Sleep(200 * time.Millisecond)
+	buf := make([]byte, 1)
+	_ = ac.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
+	_, readErr := ac.Read(buf)
+	_ = ac.Close()
+	if readErr == nil {
+		t.Fatal("expected admin mqtt connection closed")
+	}
+	select {
+	case <-mqttSeen:
+		t.Fatal("mqtt should not be accepted on admin")
+	default:
+	}
+
+	if _, err := os.ReadFile(filepath.Join(dir, "admin.addr")); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestTrustedProxyClientIP(t *testing.T) {
+	ps, err := ParseTrustedProxies([]string{"10.0.0.0/8", "192.168.1.1"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	r := &http.Request{
+		RemoteAddr: "10.1.2.3:1234",
+		Header:     http.Header{"X-Forwarded-For": []string{"1.1.1.1, 10.9.9.9"}},
+	}
+	if got := ps.ClientIP(r); got != "1.1.1.1" {
+		t.Fatalf("got %q", got)
+	}
+	// 非代理来源忽略头
+	r2 := &http.Request{
+		RemoteAddr: "8.8.8.8:9",
+		Header:     http.Header{"X-Forwarded-For": []string{"1.1.1.1"}},
+	}
+	if got := ps.ClientIP(r2); got != "8.8.8.8" {
+		t.Fatalf("got %q", got)
+	}
+}
+
+func TestFirstByteTimeout(t *testing.T) {
+	c1, c2 := net.Pipe()
+	defer func() { _ = c1.Close() }()
+	defer func() { _ = c2.Close() }()
+	done := make(chan error, 1)
+	go func() {
+		_, _, err := peekFirstByte(c2)
+		done <- err
+	}()
+	select {
+	case err := <-done:
+		if err == nil {
+			t.Fatal("expected timeout error")
+		}
+	case <-time.After(12 * time.Second):
+		t.Fatal("peek did not time out")
+	}
+}
+
+func writeTestCert(t *testing.T, dir, cn string) (certPath, keyPath string) {
+	t.Helper()
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		t.Fatal(err)
+	}
+	tmpl := &x509.Certificate{
+		SerialNumber: big.NewInt(time.Now().UnixNano()),
+		Subject:      pkix.Name{CommonName: cn},
+		NotBefore:    time.Now().Add(-time.Hour),
+		NotAfter:     time.Now().Add(24 * time.Hour),
+		KeyUsage:     x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
+		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		DNSNames:     []string{"localhost"},
+		IPAddresses:  []net.IP{net.ParseIP("127.0.0.1")},
+	}
+	der, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, &key.PublicKey, key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	certPath = filepath.Join(dir, cn+".crt")
+	keyPath = filepath.Join(dir, cn+".key")
+	certOut, err := os.Create(certPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: der})
+	_ = certOut.Close()
+	keyOut, err := os.Create(keyPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, err := x509.MarshalECPrivateKey(key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = pem.Encode(keyOut, &pem.Block{Type: "EC PRIVATE KEY", Bytes: b})
+	_ = keyOut.Close()
+	return certPath, keyPath
+}

internal/listener/proxy.go

@@ -0,0 +1,101 @@
+package listener
+
+import (
+	"net"
+	"net/http"
+	"strings"
+)
+
+// ProxySet 保存受信任代理地址段。
+type ProxySet struct {
+	nets []*net.IPNet
+}
+
+// ParseTrustedProxies 解析 CIDR 或单 IP 列表。
+func ParseTrustedProxies(cidrs []string) (*ProxySet, error) {
+	ps := &ProxySet{}
+	for _, s := range cidrs {
+		s = strings.TrimSpace(s)
+		if s == "" {
+			continue
+		}
+		if !strings.Contains(s, "/") {
+			ip := net.ParseIP(s)
+			if ip == nil {
+				continue
+			}
+			if ip.To4() != nil {
+				s += "/32"
+			} else {
+				s += "/128"
+			}
+		}
+		_, n, err := net.ParseCIDR(s)
+		if err != nil {
+			return nil, err
+		}
+		ps.nets = append(ps.nets, n)
+	}
+	return ps, nil
+}
+
+// Contains 判断 IP 是否在受信任段内。
+func (ps *ProxySet) Contains(ip net.IP) bool {
+	if ps == nil || ip == nil {
+		return false
+	}
+	for _, n := range ps.nets {
+		if n.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}
+
+// ClientIP 按 DEVELOPMENT 4.5：来自受信任代理时，取 X-Forwarded-For 从右往左第一个不在段内的 IP。
+// 非代理来源忽略转发头，返回 RemoteAddr 的 IP。
+func (ps *ProxySet) ClientIP(r *http.Request) string {
+	remoteIP := ipFromAddr(r.RemoteAddr)
+	if ps == nil || remoteIP == nil || !ps.Contains(remoteIP) {
+		if remoteIP != nil {
+			return remoteIP.String()
+		}
+		return ""
+	}
+	xff := r.Header.Get("X-Forwarded-For")
+	if xff == "" {
+		return remoteIP.String()
+	}
+	parts := strings.Split(xff, ",")
+	for i := len(parts) - 1; i >= 0; i-- {
+		ipStr := strings.TrimSpace(parts[i])
+		ip := net.ParseIP(ipStr)
+		if ip == nil {
+			continue
+		}
+		if !ps.Contains(ip) {
+			return ip.String()
+		}
+	}
+	return remoteIP.String()
+}
+
+// IsHTTPS 来自受信任代理时按 X-Forwarded-Proto 判断。
+func (ps *ProxySet) IsHTTPS(r *http.Request) bool {
+	if r.TLS != nil {
+		return true
+	}
+	remoteIP := ipFromAddr(r.RemoteAddr)
+	if ps == nil || remoteIP == nil || !ps.Contains(remoteIP) {
+		return false
+	}
+	return strings.EqualFold(r.Header.Get("X-Forwarded-Proto"), "https")
+}
+
+func ipFromAddr(remoteAddr string) net.IP {
+	host, _, err := net.SplitHostPort(remoteAddr)
+	if err != nil {
+		return net.ParseIP(remoteAddr)
+	}
+	return net.ParseIP(host)
+}

internal/listener/routes.go

@@ -0,0 +1,124 @@
+package listener
+
+import (
+	"net/http"
+	"strings"
+)
+
+// RouteRole 区分监听用途，决定哪些路径可用。
+type RouteRole int
+
+const (
+	// RoleShared listen 与 admin 共用同一端口。
+	RoleShared RouteRole = iota
+	// RoleClient 仅端接入（admin_listen 已分离）。
+	RoleClient
+	// RoleAdmin 仅后台。
+	RoleAdmin
+)
+
+// Handlers 由上层注入各路径处理函数；未设置的路径返回 404。
+type Handlers struct {
+	MQTT      http.Handler // /mqtt
+	ClientAPI http.Handler // /api/client/
+	AdminAPI  http.Handler // /api/admin/
+	Metrics   http.Handler // /metrics
+	Static    http.Handler // 后台静态页
+	Healthz   http.Handler // /healthz
+	Readyz    http.Handler // /readyz
+	// MetricsToken 共用端口时校验 Authorization: Bearer；空则 /metrics 404。
+	MetricsToken string
+}
+
+// NewMux 按角色装配 HTTP 路由骨架。
+func NewMux(role RouteRole, h Handlers) http.Handler {
+	mux := http.NewServeMux()
+
+	healthz := h.Healthz
+	if healthz == nil {
+		healthz = http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			w.WriteHeader(http.StatusOK)
+			_, _ = w.Write([]byte("ok"))
+		})
+	}
+	readyz := h.Readyz
+	if readyz == nil {
+		readyz = http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			w.WriteHeader(http.StatusOK)
+			_, _ = w.Write([]byte("ok"))
+		})
+	}
+
+	mux.Handle("GET /healthz", healthz)
+	mux.Handle("GET /readyz", readyz)
+
+	switch role {
+	case RoleClient:
+		if h.MQTT != nil {
+			mux.Handle("/mqtt", h.MQTT)
+		}
+		if h.ClientAPI != nil {
+			mux.Handle("/api/client/", h.ClientAPI)
+		}
+		// 后台路径在端端口一律 404
+		mux.Handle("/api/admin/", http.NotFoundHandler())
+		mux.Handle("/metrics", http.NotFoundHandler())
+		mux.Handle("/", http.NotFoundHandler())
+
+	case RoleAdmin:
+		if h.AdminAPI != nil {
+			mux.Handle("/api/admin/", h.AdminAPI)
+		}
+		if h.Metrics != nil {
+			mux.Handle("GET /metrics", h.Metrics)
+		} else {
+			mux.Handle("GET /metrics", http.NotFoundHandler())
+		}
+		mux.Handle("/mqtt", http.NotFoundHandler())
+		mux.Handle("/api/client/", http.NotFoundHandler())
+		if h.Static != nil {
+			mux.Handle("/", h.Static)
+		} else {
+			mux.Handle("/", http.NotFoundHandler())
+		}
+
+	default: // RoleShared
+		if h.MQTT != nil {
+			mux.Handle("/mqtt", h.MQTT)
+		}
+		if h.ClientAPI != nil {
+			mux.Handle("/api/client/", h.ClientAPI)
+		}
+		if h.AdminAPI != nil {
+			mux.Handle("/api/admin/", h.AdminAPI)
+		}
+		mux.Handle("GET /metrics", metricsGate(h.MetricsToken, h.Metrics))
+		if h.Static != nil {
+			mux.Handle("/", h.Static)
+		} else {
+			mux.Handle("/", http.NotFoundHandler())
+		}
+	}
+
+	return mux
+}
+
+func metricsGate(token string, next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if token == "" {
+			http.NotFound(w, r)
+			return
+		}
+		auth := r.Header.Get("Authorization")
+		const prefix = "Bearer "
+		if !strings.HasPrefix(auth, prefix) || auth[len(prefix):] != token {
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
+		if next == nil {
+			http.NotFound(w, r)
+			return
+		}
+		next.ServeHTTP(w, r)
+	})
+}

internal/listener/server.go

@@ -0,0 +1,338 @@
+package listener
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+)
+
+// Kind 识别结果。
+type Kind int
+
+const (
+	KindHTTP Kind = iota
+	KindMQTT
+	KindClosed
+)
+
+// Options 控制双端口识别与分流。
+type Options struct {
+	Listen         string
+	AdminListen    string
+	DataDir        string
+	CertFile       string
+	KeyFile        string
+	AllowPlaintext bool
+	TrustedProxies []string
+	// ClientHandler / AdminHandler 分别为端端口与后台端口的 HTTP 处理；AdminListen 为空时只用 ClientHandler。
+	ClientHandler http.Handler
+	AdminHandler  http.Handler
+	// OnMQTT 在 listen 上识别到裸 MQTT（含 TLS 后）时调用；应阻塞到连接结束。
+	OnMQTT func(conn net.Conn)
+	Logger *slog.Logger
+}
+
+// Server 一个或两个 TCP 监听上的协议识别与分流。
+type Server struct {
+	opts    Options
+	log     *slog.Logger
+	proxies *ProxySet
+	certs   *CertReloader
+
+	clientHTTP *ChanListener
+	adminHTTP  *ChanListener
+	clientSrv  *http.Server
+	adminSrv   *http.Server
+
+	clientLn net.Listener
+	adminLn  net.Listener
+
+	listenAddr      string
+	adminAddr       string
+	writeListenAddr bool
+	writeAdminAddr  bool
+
+	wg        sync.WaitGroup
+	closed    chan struct{}
+	closeOnce sync.Once
+}
+
+// New 校验选项并准备证书；不开始监听。
+func New(opts Options) (*Server, error) {
+	if opts.Listen == "" {
+		return nil, errors.New("listener: listen is required")
+	}
+	if opts.ClientHandler == nil {
+		return nil, errors.New("listener: ClientHandler is required")
+	}
+	log := opts.Logger
+	if log == nil {
+		log = slog.Default()
+	}
+	ps, err := ParseTrustedProxies(opts.TrustedProxies)
+	if err != nil {
+		return nil, fmt.Errorf("trusted_proxies: %w", err)
+	}
+	s := &Server{
+		opts:    opts,
+		log:     log,
+		proxies: ps,
+		closed:  make(chan struct{}),
+	}
+	hasCert := opts.CertFile != "" && opts.KeyFile != ""
+	if hasCert {
+		cr, err := NewCertReloader(opts.CertFile, opts.KeyFile, log)
+		if err != nil {
+			return nil, fmt.Errorf("tls: %w", err)
+		}
+		s.certs = cr
+	} else {
+		log.Warn("tls not configured; plaintext only")
+	}
+	s.writeListenAddr = isPortZero(opts.Listen)
+	s.writeAdminAddr = opts.AdminListen != "" && isPortZero(opts.AdminListen)
+	return s, nil
+}
+
+// Start 开始监听并分流；非阻塞，关闭用 Close。
+func (s *Server) Start(ctx context.Context) error {
+	ln, err := net.Listen("tcp", s.opts.Listen)
+	if err != nil {
+		return fmt.Errorf("listen %s: %w", s.opts.Listen, err)
+	}
+	s.clientLn = ln
+	s.listenAddr = ln.Addr().String()
+	if s.writeListenAddr {
+		if err := writeAddrFile(s.opts.DataDir, "listen.addr", s.listenAddr); err != nil {
+			_ = ln.Close()
+			return err
+		}
+	}
+
+	s.clientHTTP = NewChanListener(ln.Addr(), 128)
+	s.clientSrv = &http.Server{
+		Handler:           s.opts.ClientHandler,
+		ReadHeaderTimeout: 10 * time.Second,
+	}
+	s.wg.Add(1)
+	go func() {
+		defer s.wg.Done()
+		err := s.clientSrv.Serve(s.clientHTTP)
+		if err != nil && !errors.Is(err, http.ErrServerClosed) {
+			s.log.Error("client http serve", "err", err)
+		}
+	}()
+	s.wg.Add(1)
+	go s.acceptLoop(ln, false)
+
+	if s.opts.AdminListen != "" {
+		aln, err := net.Listen("tcp", s.opts.AdminListen)
+		if err != nil {
+			_ = s.Close()
+			return fmt.Errorf("admin_listen %s: %w", s.opts.AdminListen, err)
+		}
+		s.adminLn = aln
+		s.adminAddr = aln.Addr().String()
+		if s.writeAdminAddr {
+			if err := writeAddrFile(s.opts.DataDir, "admin.addr", s.adminAddr); err != nil {
+				_ = s.Close()
+				return err
+			}
+		}
+		adminHandler := s.opts.AdminHandler
+		if adminHandler == nil {
+			adminHandler = http.NotFoundHandler()
+		}
+		s.adminHTTP = NewChanListener(aln.Addr(), 64)
+		s.adminSrv = &http.Server{
+			Handler:           adminHandler,
+			ReadHeaderTimeout: 10 * time.Second,
+		}
+		s.wg.Add(1)
+		go func() {
+			defer s.wg.Done()
+			err := s.adminSrv.Serve(s.adminHTTP)
+			if err != nil && !errors.Is(err, http.ErrServerClosed) {
+				s.log.Error("admin http serve", "err", err)
+			}
+		}()
+		s.wg.Add(1)
+		go s.acceptLoop(aln, true)
+	}
+
+	go func() {
+		<-ctx.Done()
+		_ = s.Close()
+	}()
+	return nil
+}
+
+// ListenAddr 返回端监听实际地址。
+func (s *Server) ListenAddr() string { return s.listenAddr }
+
+// AdminAddr 返回后台监听实际地址（未分离时为空）。
+func (s *Server) AdminAddr() string { return s.adminAddr }
+
+// Proxies 返回受信任代理集合。
+func (s *Server) Proxies() *ProxySet { return s.proxies }
+
+// TLSConfig 返回当前 TLS 配置（未配置证书时为 nil）。
+func (s *Server) TLSConfig() *tls.Config {
+	if s.certs == nil {
+		return nil
+	}
+	return s.certs.TLSConfig()
+}
+
+// Close 停止接受并关闭 HTTP。
+func (s *Server) Close() error {
+	var first error
+	s.closeOnce.Do(func() {
+		close(s.closed)
+		if s.clientLn != nil {
+			_ = s.clientLn.Close()
+		}
+		if s.adminLn != nil {
+			_ = s.adminLn.Close()
+		}
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		if s.clientSrv != nil {
+			if err := s.clientSrv.Shutdown(shutdownCtx); err != nil && first == nil {
+				first = err
+			}
+		}
+		if s.adminSrv != nil {
+			if err := s.adminSrv.Shutdown(shutdownCtx); err != nil && first == nil {
+				first = err
+			}
+		}
+		if s.clientHTTP != nil {
+			_ = s.clientHTTP.Close()
+		}
+		if s.adminHTTP != nil {
+			_ = s.adminHTTP.Close()
+		}
+		if s.certs != nil {
+			s.certs.Close()
+		}
+	})
+	s.wg.Wait()
+	return first
+}
+
+func (s *Server) acceptLoop(ln net.Listener, isAdmin bool) {
+	defer s.wg.Done()
+	for {
+		c, err := ln.Accept()
+		if err != nil {
+			select {
+			case <-s.closed:
+				return
+			default:
+				return
+			}
+		}
+		s.wg.Add(1)
+		go func(conn net.Conn) {
+			defer s.wg.Done()
+			s.handleConn(conn, isAdmin)
+		}(c)
+	}
+}
+
+func (s *Server) handleConn(conn net.Conn, isAdmin bool) {
+	kind, out, err := s.classify(conn, isAdmin, false)
+	if err != nil || kind == KindClosed {
+		_ = conn.Close()
+		return
+	}
+	switch kind {
+	case KindHTTP:
+		httpLn := s.clientHTTP
+		if isAdmin {
+			httpLn = s.adminHTTP
+		}
+		if httpLn == nil {
+			_ = out.Close()
+			return
+		}
+		httpLn.Enqueue(out)
+	case KindMQTT:
+		if s.opts.OnMQTT != nil {
+			s.opts.OnMQTT(out)
+		} else {
+			_ = out.Close()
+		}
+	default:
+		_ = out.Close()
+	}
+}
+
+// classify 读首字节分流；afterTLS 表示已在 TLS 内层再识别。
+func (s *Server) classify(conn net.Conn, isAdmin, afterTLS bool) (Kind, net.Conn, error) {
+	c, b, err := peekFirstByte(conn)
+	if err != nil {
+		return KindClosed, nil, err
+	}
+
+	hasCert := s.certs != nil
+	allowPlain := s.opts.AllowPlaintext || !hasCert
+
+	if b == 0x16 {
+		if !hasCert {
+			return KindClosed, nil, errors.New("tls client hello but no certificate")
+		}
+		if afterTLS {
+			return KindClosed, nil, errors.New("nested tls")
+		}
+		tlsConn := tls.Server(c, s.certs.TLSConfig())
+		if err := tlsConn.Handshake(); err != nil {
+			return KindClosed, nil, err
+		}
+		return s.classify(tlsConn, isAdmin, true)
+	}
+
+	if !allowPlain && !afterTLS {
+		// 配了证书且未允许明文：非 TLS 首字节直接关
+		return KindClosed, nil, errors.New("plaintext not allowed")
+	}
+
+	if b >= 'A' && b <= 'Z' {
+		return KindHTTP, c, nil
+	}
+	if b == 0x10 {
+		if isAdmin {
+			return KindClosed, nil, errors.New("mqtt not allowed on admin_listen")
+		}
+		return KindMQTT, c, nil
+	}
+	return KindClosed, nil, errors.New("unknown first byte")
+}
+
+func writeAddrFile(dataDir, name, addr string) error {
+	if dataDir == "" {
+		return errors.New("data_dir required to write addr file")
+	}
+	if err := os.MkdirAll(dataDir, 0o755); err != nil {
+		return err
+	}
+	return os.WriteFile(filepath.Join(dataDir, name), []byte(addr+"\n"), 0o644)
+}
+
+func isPortZero(addr string) bool {
+	_, port, err := net.SplitHostPort(addr)
+	if err != nil {
+		return strings.HasSuffix(addr, ":0") || addr == ":0"
+	}
+	return port == "0"
+}

internal/listener/tls.go

@@ -0,0 +1,117 @@
+package listener
+
+import (
+	"crypto/tls"
+	"log/slog"
+	"os"
+	"sync"
+	"time"
+)
+
+// CertReloader 按文件修改时间每小时重载证书；失败继续用旧证书。
+type CertReloader struct {
+	certFile string
+	keyFile  string
+	log      *slog.Logger
+
+	mu       sync.RWMutex
+	cert     *tls.Certificate
+	certMod  time.Time
+	keyMod   time.Time
+	stop     chan struct{}
+	stopOnce sync.Once
+}
+
+// NewCertReloader 立即加载一次证书。
+func NewCertReloader(certFile, keyFile string, log *slog.Logger) (*CertReloader, error) {
+	if log == nil {
+		log = slog.Default()
+	}
+	r := &CertReloader{
+		certFile: certFile,
+		keyFile:  keyFile,
+		log:      log,
+		stop:     make(chan struct{}),
+	}
+	if err := r.reload(true); err != nil {
+		return nil, err
+	}
+	go r.loop()
+	return r, nil
+}
+
+// GetCertificate 供 tls.Config.GetCertificate 使用。
+func (r *CertReloader) GetCertificate(*tls.ClientHelloInfo) (*tls.Certificate, error) {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	return r.cert, nil
+}
+
+// Certificate 返回当前证书（测试用）。
+func (r *CertReloader) Certificate() *tls.Certificate {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	return r.cert
+}
+
+// Close 停止重载循环。
+func (r *CertReloader) Close() {
+	r.stopOnce.Do(func() { close(r.stop) })
+}
+
+func (r *CertReloader) loop() {
+	t := time.NewTicker(time.Hour)
+	defer t.Stop()
+	for {
+		select {
+		case <-r.stop:
+			return
+		case <-t.C:
+			if err := r.reload(false); err != nil {
+				r.log.Error("tls cert reload failed, keeping old cert", "err", err)
+			}
+		}
+	}
+}
+
+// ReloadNow 立即按 mtime 检查并重载（测试用）。
+func (r *CertReloader) ReloadNow() error {
+	return r.reload(false)
+}
+
+func (r *CertReloader) reload(force bool) error {
+	certInfo, err := os.Stat(r.certFile)
+	if err != nil {
+		return err
+	}
+	keyInfo, err := os.Stat(r.keyFile)
+	if err != nil {
+		return err
+	}
+	r.mu.RLock()
+	same := !force && certInfo.ModTime().Equal(r.certMod) && keyInfo.ModTime().Equal(r.keyMod) && r.cert != nil
+	r.mu.RUnlock()
+	if same {
+		return nil
+	}
+	cert, err := tls.LoadX509KeyPair(r.certFile, r.keyFile)
+	if err != nil {
+		return err
+	}
+	r.mu.Lock()
+	r.cert = &cert
+	r.certMod = certInfo.ModTime()
+	r.keyMod = keyInfo.ModTime()
+	r.mu.Unlock()
+	r.log.Info("tls certificate loaded", "cert", r.certFile)
+	return nil
+}
+
+// TLSConfig 构造不设 NextProtos 的服务端 TLS 配置。
+func (r *CertReloader) TLSConfig() *tls.Config {
+	return &tls.Config{
+		GetCertificate: r.GetCertificate,
+		MinVersion:     tls.VersionTLS12,
+		// 故意不设 NextProtos，以便声明 ALPN mqtt 的客户端仍能握手。
+	}
+}