feat: SDK agent integration + UDP plugin framework + SNMP plugin

SDK enhancements for endpoint agent embedding:
- ScanWithController for pause/resume and live stats
- OnProgress callback for periodic progress reporting
- TaskID injection into every scan result
- ScanController with goroutine-safe pause/resume/stats
- Multi-target stats aggregation (race-free)

UDP plugin infrastructure:
- PluginTypeUDP registry with dedicated dispatch path
- DialUDP on ScanSession with rate limiting and packet counting
- UDP plugins bypass TCP port scan, probe targets directly
- FilterService excludes UDP plugins from TCP port matching

SNMP plugin (first UDP plugin):
- SNMPv2c GetRequest probe for sysDescr detection
- Community string brute force (public/private/community/etc)
- Pure stdlib implementation (encoding/asn1)
- Registered as safe default plugin on port 161/UDP

Tests: 95.7% SDK coverage, race-free, 50+ new test cases

README.md

@@ -52,6 +52,7 @@
 - **并发控制** - 端口扫描线程、服务扫描线程独立配置
 
 ### 扩展功能
+- **SDK嵌入** - `pkg/fscan`提供Go SDK，可嵌入Agent或安全平台，支持任务控制(Pause/Resume)、实时进度回调、TaskID追溯
 - **Web管理界面** - 可视化扫描任务管理(条件编译 -tags web)
 - **Lab靶场环境** - 内置Docker靶场用于测试学习
 - **插件化架构** - 服务插件/Web插件/本地插件分离，易于扩展
@@ -234,6 +235,11 @@ yay -S fscan-git
 - **后两周** - Bug修复与代码整合
 - **欢迎PR** - 期待您的贡献！
 
+### SDK & Agent 集成
+- 扩展SDK能力，完善端侧Agent嵌入支持
+- 断点续扫、带宽级限速、内存水位控制
+- 更多Agent场景的集成示例
+
 ### 插件生态
 - 持续扩展服务插件覆盖范围
 - 为每个服务插件开发更多漏洞检测和利用能力

common/session.go

@@ -24,6 +24,7 @@ type ScanSession struct {
 	State      *State     // 可变，原子操作，每会话独立
 	Params     *FlagVars  // 原始参数，只读
 	ResultSink ResultSink // 可选，覆盖全局输出
+	PauseGate  func(ctx context.Context) error
 
 	// 每会话 dialer（按 timeout 懒初始化，取决于代理配置）
 	dialerMu   sync.Mutex
@@ -120,6 +121,23 @@ func (s *ScanSession) DialTCP(ctx context.Context, network, address string, time
 	return conn, nil
 }
 
+// DialUDP creates a connected UDP socket with rate limiting and packet counting.
+// UDP cannot be proxied; if a proxy is configured the connection is made directly.
+func (s *ScanSession) DialUDP(ctx context.Context, address string, timeout time.Duration) (net.Conn, error) {
+	if ok, err := CanSendPacketWith(s.Config, s.State); !ok {
+		return nil, fmt.Errorf("%s", i18n.Tr("network_rate_limited", err.Error()))
+	}
+
+	conn, err := net.DialTimeout("udp", address, timeout)
+	if err != nil {
+		s.State.IncrementUDPPacketCount()
+		return nil, err
+	}
+	_ = conn.SetDeadline(time.Now().Add(timeout))
+	s.State.IncrementUDPPacketCount()
+	return conn, nil
+}
+
 // HTTPDo executes an HTTP request with the session's packet limits and counters.
 func (s *ScanSession) HTTPDo(client *http.Client, req *http.Request) (*http.Response, error) {
 	if ok, err := CanSendPacketWith(s.Config, s.State); !ok {

core/base_scan_strategy.go

@@ -106,6 +106,10 @@ func (b *BaseScanStrategy) isLocalPlugin(pluginName string) bool {
 	return plugins.HasType(pluginName, plugins.PluginTypeLocal)
 }
 
+func (b *BaseScanStrategy) isUDPPlugin(pluginName string) bool {
+	return plugins.IsUDP(pluginName)
+}
+
 func (b *BaseScanStrategy) isLocalPluginExplicitlySpecified(pluginName string, config *common.Config) bool {
 	return config.LocalPlugin == pluginName
 }
@@ -141,6 +145,11 @@ func (b *BaseScanStrategy) isPluginApplicableToPort(pluginName string, targetPor
 
 // isPluginPassesFilterType 检查插件是否通过过滤器类型检查
 func (b *BaseScanStrategy) isPluginPassesFilterType(pluginName string, isCustomMode bool, config *common.Config) bool {
+	// UDP 插件有独立分发路径，不参与 TCP 端口匹配流水线
+	if b.isUDPPlugin(pluginName) {
+		return false
+	}
+
 	// 自定义模式下强制运行所有明确指定的插件
 	if isCustomMode {
 		return true
@@ -155,8 +164,8 @@ func (b *BaseScanStrategy) isPluginPassesFilterType(pluginName string, isCustomM
 		}
 		return false
 	case FilterService:
-		// 服务扫描策略：排除本地插件
+		// 服务扫描策略：排除本地插件和UDP插件（UDP有独立分发路径）
-		return !b.isLocalPlugin(pluginName)
+		return !b.isLocalPlugin(pluginName) && !b.isUDPPlugin(pluginName)
 	case FilterWeb:
 		// Web扫描策略：只允许Web插件
 		return b.isWebPlugin(pluginName)
@@ -231,9 +240,9 @@ func (b *BaseScanStrategy) getPluginsByFilterType() []string {
 			}
 		}
 	case FilterService:
-		// 服务扫描策略：排除本地插件和纯Web插件，保留服务插件
+		// 服务扫描策略：排除本地插件和UDP插件，保留TCP服务插件
 		for _, pluginName := range allPlugins {
-			if !b.isLocalPlugin(pluginName) {
+			if !b.isLocalPlugin(pluginName) && !b.isUDPPlugin(pluginName) {
 				filteredPlugins = append(filteredPlugins, pluginName)
 			}
 		}

core/scanner.go

@@ -211,6 +211,12 @@ func ExecuteScanTasks(ctx context.Context, session *common.ScanSession, targets
 		default:
 		}
 
+		if session.PauseGate != nil {
+			if err := session.PauseGate(ctx); err != nil {
+				return
+			}
+		}
+
 		targetPort := target.Port
 
 		for _, pluginName := range pluginsToRun {
@@ -262,6 +268,12 @@ func executeScanTask(ctx context.Context, session *common.ScanSession, pluginNam
 	default:
 	}
 
+	if session.PauseGate != nil {
+		if err := session.PauseGate(ctx); err != nil {
+			return
+		}
+	}
+
 	// 长驻插件不进 WaitGroup，通过 ctx 管理生命周期
 	if longRunningPlugins[pluginName] {
 		ready := make(chan struct{}, 1)

core/service_scanner.go

@@ -10,6 +10,7 @@ import (
 	"github.com/shadow1ng/fscan/common"
 	"github.com/shadow1ng/fscan/common/i18n"
 	"github.com/shadow1ng/fscan/common/parsers"
+	"github.com/shadow1ng/fscan/plugins"
 )
 
 // ServiceScanStrategy 服务扫描策略
@@ -161,6 +162,11 @@ func (s *ServiceScanStrategy) performHostScan(ctx context.Context, session *comm
 		return
 	}
 
+	// UDP 插件并行分发：直接对存活主机发协议探测包，不走端口扫描
+	if len(hosts) > 0 {
+		s.dispatchUDPPlugins(ctx, session, hosts, info, config, ch, wg)
+	}
+
 	// 流式 channel：端口扫描发现开放端口后立即通知插件执行
 	stream := make(chan string, 64)
 
@@ -213,6 +219,34 @@ func (s *ServiceScanStrategy) performHostScan(ctx context.Context, session *comm
 	}
 }
 
+// dispatchUDPPlugins 分发UDP协议插件，跳过TCP端口扫描链路
+func (s *ServiceScanStrategy) dispatchUDPPlugins(ctx context.Context, session *common.ScanSession, hosts []string, baseInfo common.HostInfo, config *common.Config, ch chan struct{}, wg *sync.WaitGroup) {
+	allPlugins, isCustomMode := s.GetPlugins(config)
+
+	var udpPlugins []string
+	for _, name := range allPlugins {
+		if plugins.IsUDP(name) {
+			if isCustomMode || plugins.IsSafe(name) {
+				udpPlugins = append(udpPlugins, name)
+			}
+		}
+	}
+	if len(udpPlugins) == 0 {
+		return
+	}
+
+	for _, host := range hosts {
+		for _, pluginName := range udpPlugins {
+			for _, port := range plugins.GetPluginPorts(pluginName) {
+				target := baseInfo
+				target.Host = host
+				target.Port = port
+				executeScanTask(ctx, session, pluginName, target, ch, wg)
+			}
+		}
+	}
+}
+
 // PrepareTargets 准备目标信息
 func (s *ServiceScanStrategy) PrepareTargets(info common.HostInfo, session *common.ScanSession) []common.HostInfo {
 	// 发现目标主机和端口

examples/embed-agent/main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	fscan "github.com/shadow1ng/fscan/pkg/fscan"
+)
+
+func main() {
+	scanner := fscan.NewScanner(fscan.Config{
+		TaskID:       "task-001",
+		Timeout:      3 * time.Second,
+		Threads:      64,
+		DisablePing:  true,
+		DisableBrute: true,
+		Plugins:      []string{"ssh", "mysql", "redis", "ftp"},
+		OnProgress: func(p fscan.ScanProgress) {
+			fmt.Printf("[progress] %d/%d tasks, %d packets, paused=%v, elapsed=%s\n",
+				p.TasksCompleted, p.TasksTotal, p.Packets, p.Paused, p.Duration.Round(time.Millisecond))
+		},
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	ctrl, reportCh, errCh := scanner.ScanWithController(ctx,
+		fscan.Target{Host: "127.0.0.1", Ports: []int{21, 22, 3306, 6379}},
+	)
+
+	// Simulate a pause command from control plane after 1 second.
+	go func() {
+		time.Sleep(1 * time.Second)
+		fmt.Println("[agent] pausing scan...")
+		ctrl.Pause()
+
+		// Check live stats while paused.
+		stats := ctrl.Stats()
+		fmt.Printf("[agent] stats while paused: completed=%d, packets=%d\n",
+			stats.TasksCompleted, stats.Packets)
+
+		time.Sleep(2 * time.Second)
+		fmt.Println("[agent] resuming scan...")
+		ctrl.Resume()
+	}()
+
+	report := <-reportCh
+	if err := <-errCh; err != nil {
+		fmt.Printf("[agent] scan error: %v\n", err)
+		return
+	}
+
+	fmt.Printf("\n[agent] scan complete: %d results, %d vulns, %d services\n",
+		report.Summary.Total, report.Summary.Vulns, report.Summary.Services)
+
+	for _, result := range report.Results {
+		taskID, _ := result.DetailString("task_id")
+		fmt.Printf("  [%s] %s %s (task=%s)\n", result.Type, result.Target, result.Status, taskID)
+	}
+}

pkg/fscan/README.md

@@ -1,71 +1,148 @@
 # fscan SDK
 
-`pkg/fscan` exposes fscan as an embeddable Go scanner while keeping the CLI unchanged.
+`pkg/fscan` exposes fscan as an embeddable Go scanner, designed for Agent and security platform integration.
 
-See `examples/embed-basic` for slice-based collection and `examples/embed-stream` for streaming integration.
+## Quick Start
 
 ```go
-package main
+import fscan "github.com/shadow1ng/fscan/pkg/fscan"
 
-import (
+scanner := fscan.NewScanner(fscan.Config{
-	"context"
-	"fmt"
-	"time"
-
-	fscan "github.com/shadow1ng/fscan/pkg/fscan"
-)
-
-func main() {
-	config := fscan.Config{
     Timeout:      3 * time.Second,
     Threads:      128,
     DisablePing:  true,
-		DisableBrute: true,
     Plugins:      []string{"ssh", "mysql", "redis"},
-		OnResult: func(result fscan.Result) {
+})
-			if result.Type == fscan.ResultTypeService || result.Type == fscan.ResultTypeVuln {
-				fmt.Printf("%s %s %s\n", result.Type, result.Target, result.Status)
-			}
-		},
-	}
-	if err := fscan.ValidateConfig(config, fscan.Target{Host: "192.168.1.10"}); err != nil {
-		panic(err)
-	}
 
-scanner := fscan.NewScanner(config)
+results, err := scanner.Scan(context.Background(), fscan.Target{
-report, err := scanner.ScanReport(context.Background(), fscan.Target{
+    Host:  "192.168.1.0/24",
-	Host:  "192.168.1.10",
     Ports: []int{22, 3306, 6379},
 })
-if err != nil {
+```
-	panic(err)
-}
 
-fmt.Printf("scan finished: %+v stats=%+v\n", report.Summary, report.Stats)
+## Scan Modes
-for _, result := range report.Results {
+
-	// Store, forward, or filter the result in the embedding system.
+| Mode | API | Use Case |
-	if credential, ok := result.AsCredential(); ok {
+|------|-----|----------|
-		fmt.Printf("weak credential: %s %s:%s\n", credential.Target, credential.Username, credential.Password)
+| Collect | `Scan` / `ScanReport` | Get all results as a slice |
-	}
+| Stream | `ScanEach` | Process results one-by-one, no memory accumulation |
+| Controlled | `ScanWithController` | Agent integration with pause/resume and live stats |
+
+### Basic: Collect All Results
+
+```go
+scanner := fscan.NewScanner(config)
+report, err := scanner.ScanReport(ctx, target)
+
+fmt.Printf("total=%d vulns=%d\n", report.Summary.Total, report.Summary.Vulns)
+for _, r := range report.Results {
+    if cred, ok := r.AsCredential(); ok {
+        fmt.Printf("%s %s:%s\n", cred.Target, cred.Username, cred.Password)
     }
 }
 ```
 
-The SDK currently reuses fscan's existing scan core and plugin registry. Embedded scans build per-session runtime state and can run concurrently.
+### Stream: Process Results Without Retention
 
-By default, the SDK runs a conservative service-oriented plugin set and blocks plugins with local side effects or active POC behavior. Set `AllowUnsafePlugins` only when the embedding system explicitly wants those capabilities.
+```go
+scanner := fscan.NewScanner(config)
+err := scanner.ScanEach(ctx, func(result fscan.Result) error {
+    // Forward to database, message queue, etc.
+    return sendToBackend(result)
+}, target)
+```
 
-## API surface
+### Controlled: Agent Integration
+
+```go
+scanner := fscan.NewScanner(fscan.Config{
+    TaskID:       "task-001",
+    Plugins:      []string{"ssh", "redis"},
+    OnProgress: func(p fscan.ScanProgress) {
+        reportHeartbeat(p.TasksCompleted, p.TasksTotal, p.Paused)
+    },
+})
+
+ctrl, reportCh, errCh := scanner.ScanWithController(ctx, target)
+
+// Control plane commands
+ctrl.Pause()
+stats := ctrl.Stats()  // live stats while paused
+ctrl.Resume()
+
+report := <-reportCh
+err := <-errCh
+```
+
+## Agent Features
+
+### ScanController
+
+`ScanWithController` returns a `*ScanController` for runtime control:
+
+| Method | Description |
+|--------|-------------|
+| `Pause()` | Pause task dispatch (in-flight tasks complete naturally) |
+| `Resume()` | Resume task dispatch |
+| `IsPaused()` | Check pause state |
+| `Stats()` | Live `ScanStats` aggregated across all targets |
+
+The controller is goroutine-safe. Pause takes effect at the task dispatch level -- already-running plugin tasks will finish, but no new tasks are dispatched until resumed.
+
+### OnProgress
+
+Set `Config.OnProgress` to receive periodic `ScanProgress` snapshots (~500ms interval):
+
+```go
+type ScanProgress struct {
+    TasksTotal     int64
+    TasksCompleted int64
+    Duration       time.Duration
+    Packets        int64
+    TCPPackets     int64
+    HTTPPackets    int64
+    Paused         bool
+}
+```
+
+Works with all scan modes. When used without `ScanWithController`, a lightweight internal controller is created for progress tracking.
+
+### TaskID
+
+Set `Config.TaskID` to inject a task identifier into every `Result.Details["task_id"]`. This lets the Agent associate scan results with control plane tasks without post-processing.
+
+## Plugin Safety
+
+By default, the SDK runs a conservative plugin set (service detection + auth check). Plugins with local side effects (`poc`, `local-effect`) are blocked unless `AllowUnsafePlugins` is set.
+
+```go
+// List available plugins
+for _, p := range fscan.ListPlugins() {
+    fmt.Printf("%s safe=%v caps=%v\n", p.Name, p.Safe, p.Capabilities)
+}
+
+// Check before use
+if fscan.IsSafePlugin("webpoc") { ... }
+```
+
+Plugin capabilities: `detect`, `auth-check`, `brute`, `poc`, `local-effect`.
+
+## API Reference
 
 | Area | API |
-| --- | --- |
+|------|-----|
-| Scanning | `NewScanner`, `Scan`, `ScanEach`, `ScanReport` |
+| Scanning | `NewScanner`, `Scan`, `ScanEach`, `ScanReport`, `ScanWithController` |
+| Control | `ScanController` (`Pause`, `Resume`, `IsPaused`, `Stats`) |
 | Configuration | `Config`, `Target`, `CredentialPair`, `ValidateConfig` |
-| Plugins | `DefaultSafePlugins`, `ListPlugins`, `GetPlugin`, `IsSafePlugin`, `PluginCapabilities`, `PluginInfo` |
+| Progress | `OnProgress`, `ScanProgress`, `TaskID` |
-| Results | `Result`, `ResultTypeHost`, `ResultTypePort`, `ResultTypeService`, `ResultTypeVuln` |
+| Plugins | `DefaultSafePlugins`, `ListPlugins`, `GetPlugin`, `IsSafePlugin`, `PluginCapabilities` |
-| Result helpers | `Port`, `Service`, `Plugin`, `Username`, `Password`, `Banner`, `Vulnerability`, `URL`, `Protocol`, `IsWeb`, `IsCredential`, `AsPort`, `AsService`, `AsCredential`, `AsVulnerability` |
+| Results | `Result`, `ResultType*` constants |
-| Summary and stats | `ScanReport`, `ScanStats`, `SummarizeResults`, `ResultSummary.Add` |
+| Result helpers | `Port`, `Service`, `Plugin`, `Username`, `Password`, `Banner`, `Vulnerability`, `URL`, `Protocol`, `IsWeb`, `IsCredential` |
+| Typed views | `AsPort`, `AsService`, `AsCredential`, `AsVulnerability` |
+| Summary | `ScanReport`, `ScanStats`, `SummarizeResults`, `ResultSummary.Add` |
 
-Use `Scan` when you want all results returned as a slice. Use `ScanReport` when the embedding system also needs summary counts and runtime counters. Use `ScanEach` when results should be streamed into another system; handler calls are serialized, and returning an error stops the scan and returns that error.
+## Examples
 
-Plugin capabilities are exposed as stable strings: `detect`, `auth-check`, `brute`, `poc`, and `local-effect`. Default embedded safe mode blocks `poc` and `local-effect` plugins unless `AllowUnsafePlugins` is set.
+- [`examples/embed-basic`](../../examples/embed-basic) -- Minimal scan with result collection
+- [`examples/embed-stream`](../../examples/embed-stream) -- Streaming results with plugin listing
+- [`examples/embed-agent`](../../examples/embed-agent) -- Agent integration with pause/resume, progress, and TaskID

pkg/fscan/controller.go

@@ -0,0 +1,101 @@
+package fscan
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/shadow1ng/fscan/common"
+)
+
+// ScanController provides pause/resume control and live stats for an
+// in-progress scan. It is safe for concurrent use.
+type ScanController struct {
+	mu      sync.Mutex
+	paused  int32
+	gate    chan struct{}
+	stateMu sync.Mutex
+	states  []*common.State
+	start   time.Time
+}
+
+func newScanController() *ScanController {
+	gate := make(chan struct{})
+	close(gate)
+	return &ScanController{
+		gate:  gate,
+		start: time.Now(),
+	}
+}
+
+func (c *ScanController) Pause() {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if atomic.CompareAndSwapInt32(&c.paused, 0, 1) {
+		c.gate = make(chan struct{})
+	}
+}
+
+func (c *ScanController) Resume() {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if atomic.CompareAndSwapInt32(&c.paused, 1, 0) {
+		close(c.gate)
+	}
+}
+
+func (c *ScanController) IsPaused() bool {
+	return atomic.LoadInt32(&c.paused) == 1
+}
+
+func (c *ScanController) pauseGate(ctx context.Context) error {
+	c.mu.Lock()
+	gate := c.gate
+	c.mu.Unlock()
+	select {
+	case <-gate:
+		return nil
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+}
+
+func (c *ScanController) addState(s *common.State) {
+	c.stateMu.Lock()
+	c.states = append(c.states, s)
+	c.stateMu.Unlock()
+}
+
+func (c *ScanController) Stats() ScanStats {
+	c.stateMu.Lock()
+	states := c.states
+	c.stateMu.Unlock()
+
+	stats := ScanStats{Duration: time.Since(c.start)}
+	for _, s := range states {
+		stats.TasksTotal += s.GetEnd()
+		stats.TasksCompleted += s.GetNum()
+		stats.Packets += s.GetPacketCount()
+		stats.TCPPackets += s.GetTCPPacketCount()
+		stats.TCPSuccessPackets += s.GetTCPSuccessPacketCount()
+		stats.TCPFailedPackets += s.GetTCPFailedPacketCount()
+		stats.UDPPackets += s.GetUDPPacketCount()
+		stats.HTTPPackets += s.GetHTTPPacketCount()
+		stats.ResourceExhausted += s.GetResourceExhaustedCount()
+	}
+	return stats
+}
+
+func (c *ScanController) progress() ScanProgress {
+	stats := c.Stats()
+	return ScanProgress{
+		TasksTotal:     stats.TasksTotal,
+		TasksCompleted: stats.TasksCompleted,
+		Duration:       stats.Duration,
+		Packets:        stats.Packets,
+		TCPPackets:     stats.TCPPackets,
+		HTTPPackets:    stats.HTTPPackets,
+		Paused:         c.IsPaused(),
+	}
+}

pkg/fscan/controller_test.go

@@ -0,0 +1,317 @@
+package fscan
+
+import (
+	"context"
+	"net"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestScanControllerPauseResume(t *testing.T) {
+	ctrl := newScanController()
+
+	if ctrl.IsPaused() {
+		t.Fatal("new controller should not be paused")
+	}
+	ctrl.Pause()
+	if !ctrl.IsPaused() {
+		t.Fatal("should be paused after Pause()")
+	}
+	ctrl.Pause()
+	if !ctrl.IsPaused() {
+		t.Fatal("double Pause should still be paused")
+	}
+	ctrl.Resume()
+	if ctrl.IsPaused() {
+		t.Fatal("should not be paused after Resume()")
+	}
+	ctrl.Resume()
+	if ctrl.IsPaused() {
+		t.Fatal("double Resume should still be unpaused")
+	}
+}
+
+func TestScanControllerPauseGateBlocks(t *testing.T) {
+	ctrl := newScanController()
+	ctx := context.Background()
+
+	if err := ctrl.pauseGate(ctx); err != nil {
+		t.Fatalf("unpaused gate should not block: %v", err)
+	}
+
+	ctrl.Pause()
+	done := make(chan error, 1)
+	go func() {
+		done <- ctrl.pauseGate(ctx)
+	}()
+
+	select {
+	case <-done:
+		t.Fatal("paused gate should block")
+	case <-time.After(50 * time.Millisecond):
+	}
+
+	ctrl.Resume()
+	select {
+	case err := <-done:
+		if err != nil {
+			t.Fatalf("resumed gate error: %v", err)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("gate should unblock after Resume")
+	}
+}
+
+func TestScanControllerPauseGateContextCancel(t *testing.T) {
+	ctrl := newScanController()
+	ctrl.Pause()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	done := make(chan error, 1)
+	go func() {
+		done <- ctrl.pauseGate(ctx)
+	}()
+
+	cancel()
+	select {
+	case err := <-done:
+		if err != context.Canceled {
+			t.Fatalf("gate error = %v, want context.Canceled", err)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("gate should return on context cancel")
+	}
+}
+
+func TestScanControllerStatsWithoutState(t *testing.T) {
+	ctrl := newScanController()
+	stats := ctrl.Stats()
+	if stats.Duration <= 0 {
+		t.Fatal("duration should be positive")
+	}
+	if stats.TasksTotal != 0 || stats.Packets != 0 {
+		t.Fatalf("stats without state should be zero: %+v", stats)
+	}
+}
+
+func TestScanControllerProgress(t *testing.T) {
+	ctrl := newScanController()
+	ctrl.Pause()
+	p := ctrl.progress()
+	if !p.Paused {
+		t.Fatal("progress should report paused")
+	}
+	ctrl.Resume()
+	p = ctrl.progress()
+	if p.Paused {
+		t.Fatal("progress should report unpaused")
+	}
+}
+
+func TestScanWithControllerCompletes(t *testing.T) {
+	listener := startTestFTPListener(t)
+	defer listener.Close()
+
+	port := listener.Addr().(*net.TCPAddr).Port
+	scanner := NewScanner(Config{
+		DisablePing:  true,
+		DisableBrute: true,
+		Timeout:      time.Second,
+		Threads:      16,
+		Plugins:      []string{"ftp"},
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	ctrl, reportCh, errCh := scanner.ScanWithController(ctx, Target{Host: "127.0.0.1", Ports: []int{port}})
+
+	stats := ctrl.Stats()
+	if stats.Duration <= 0 {
+		t.Fatal("live stats duration should be positive")
+	}
+
+	report := <-reportCh
+	err := <-errCh
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(report.Results) == 0 {
+		t.Fatal("expected results")
+	}
+	if report.Summary.Total != len(report.Results) {
+		t.Fatalf("summary mismatch: %+v", report.Summary)
+	}
+}
+
+func TestScanWithControllerPauseResume(t *testing.T) {
+	first := startTestFTPListener(t)
+	defer first.Close()
+	second := startTestFTPListener(t)
+	defer second.Close()
+
+	port1 := first.Addr().(*net.TCPAddr).Port
+	port2 := second.Addr().(*net.TCPAddr).Port
+
+	scanner := NewScanner(Config{
+		DisablePing:  true,
+		DisableBrute: true,
+		Timeout:      time.Second,
+		Threads:      16,
+		Plugins:      []string{"ftp"},
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	ctrl, reportCh, errCh := scanner.ScanWithController(ctx,
+		Target{Host: "127.0.0.1", Ports: []int{port1}},
+		Target{Host: "127.0.0.1", Ports: []int{port2}},
+	)
+
+	ctrl.Pause()
+	if !ctrl.IsPaused() {
+		t.Fatal("should be paused")
+	}
+	ctrl.Resume()
+
+	report := <-reportCh
+	err := <-errCh
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(report.Results) == 0 {
+		t.Fatal("expected results after resume")
+	}
+}
+
+func TestOnProgressCalled(t *testing.T) {
+	listener := startTestFTPListener(t)
+	defer listener.Close()
+
+	var called int32
+	scanner := NewScanner(Config{
+		DisablePing:  true,
+		DisableBrute: true,
+		Timeout:      time.Second,
+		Threads:      16,
+		Plugins:      []string{"ftp"},
+		OnProgress: func(p ScanProgress) {
+			atomic.AddInt32(&called, 1)
+		},
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	port := listener.Addr().(*net.TCPAddr).Port
+	_, err := scanner.Scan(ctx, Target{Host: "127.0.0.1", Ports: []int{port}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	// OnProgress fires every 500ms; scan takes at least a moment
+	// We mainly verify it doesn't panic; calls may be 0 for very fast scans
+}
+
+func TestTaskIDInjected(t *testing.T) {
+	listener := startTestFTPListener(t)
+	defer listener.Close()
+
+	scanner := NewScanner(Config{
+		DisablePing:  true,
+		DisableBrute: true,
+		Timeout:      time.Second,
+		Threads:      16,
+		Plugins:      []string{"ftp"},
+		TaskID:       "task-abc-123",
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	port := listener.Addr().(*net.TCPAddr).Port
+	results, err := scanner.Scan(ctx, Target{Host: "127.0.0.1", Ports: []int{port}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(results) == 0 {
+		t.Fatal("expected results")
+	}
+	for _, r := range results {
+		taskID, ok := r.DetailString("task_id")
+		if !ok || taskID != "task-abc-123" {
+			t.Fatalf("result missing task_id: %#v", r.Details)
+		}
+	}
+}
+
+func TestTaskIDNotInjectedWhenEmpty(t *testing.T) {
+	listener := startTestFTPListener(t)
+	defer listener.Close()
+
+	scanner := NewScanner(Config{
+		DisablePing:  true,
+		DisableBrute: true,
+		Timeout:      time.Second,
+		Threads:      16,
+		Plugins:      []string{"ftp"},
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	port := listener.Addr().(*net.TCPAddr).Port
+	results, err := scanner.Scan(ctx, Target{Host: "127.0.0.1", Ports: []int{port}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, r := range results {
+		if _, ok := r.Details["task_id"]; ok {
+			t.Fatalf("task_id should not be present when TaskID is empty: %#v", r.Details)
+		}
+	}
+}
+
+func TestScanWithControllerCanceledContext(t *testing.T) {
+	scanner := NewScanner(Config{
+		DisablePing:  true,
+		DisableBrute: true,
+		Timeout:      time.Second,
+		Plugins:      []string{"redis"},
+	})
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	_, reportCh, errCh := scanner.ScanWithController(ctx, Target{Host: "127.0.0.1", Ports: []int{6379}})
+	<-reportCh
+	err := <-errCh
+	if err != context.Canceled {
+		t.Fatalf("error = %v, want context.Canceled", err)
+	}
+}
+
+func startTestFTPListener(t *testing.T) net.Listener {
+	t.Helper()
+	listener, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	go func() {
+		for {
+			conn, err := listener.Accept()
+			if err != nil {
+				return
+			}
+			go func(conn net.Conn) {
+				defer conn.Close()
+				_ = conn.SetDeadline(time.Now().Add(2 * time.Second))
+				_, _ = conn.Write([]byte("220 test FTP\r\n"))
+				buf := make([]byte, 64)
+				_, _ = conn.Read(buf)
+			}(conn)
+		}
+	}()
+	return listener
+}

pkg/fscan/result_test.go

@@ -2,7 +2,10 @@ package fscan
 
 import (
 	"encoding/json"
+	"math"
 	"testing"
+
+	"github.com/shadow1ng/fscan/common/output"
 )
 
 func TestResultHelpers(t *testing.T) {
@@ -57,6 +60,22 @@ func TestResultPortDoesNotParseBareIPv6(t *testing.T) {
 	}
 }
 
+func TestResultPortFromSimpleTarget(t *testing.T) {
+	result := Result{Target: "10.0.0.1:3306"}
+
+	port, ok := result.Port()
+	if !ok || port != 3306 {
+		t.Fatalf("Port = %d/%v, want 3306/true", port, ok)
+	}
+}
+
+func TestResultPortNoPort(t *testing.T) {
+	result := Result{Target: "10.0.0.1"}
+	if _, ok := result.Port(); ok {
+		t.Fatal("expected no port")
+	}
+}
+
 func TestResultCredentialHelpers(t *testing.T) {
 	result := Result{
 		Type:   ResultTypeVuln,
@@ -83,6 +102,31 @@ func TestResultCredentialHelpers(t *testing.T) {
 	}
 }
 
+func TestResultCredentialViaStatusPrefix(t *testing.T) {
+	result := Result{
+		Type:   ResultTypeVuln,
+		Target: "127.0.0.1:22",
+		Status: "weak_credential: root:pass",
+	}
+	if !result.IsCredential() {
+		t.Fatal("expected credential via status prefix")
+	}
+}
+
+func TestResultNotCredentialWithoutMarker(t *testing.T) {
+	result := Result{
+		Type:   ResultTypeVuln,
+		Target: "127.0.0.1:445",
+		Status: "MS17-010",
+		Details: map[string]interface{}{
+			"vulnerability": "MS17-010",
+		},
+	}
+	if result.IsCredential() {
+		t.Fatal("vuln without credential marker should not be credential")
+	}
+}
+
 func TestTypedResultViews(t *testing.T) {
 	portResult, ok := (Result{
 		Type:    ResultTypePort,
@@ -138,6 +182,84 @@ func TestTypedResultViews(t *testing.T) {
 	}
 }
 
+func TestAsPortNonPortResult(t *testing.T) {
+	_, ok := (Result{Type: ResultTypeHost, Target: "10.0.0.1"}).AsPort()
+	if ok {
+		t.Fatal("AsPort should return false for non-port result")
+	}
+}
+
+func TestAsPortNoPortValue(t *testing.T) {
+	_, ok := (Result{Type: ResultTypePort, Target: "10.0.0.1"}).AsPort()
+	if ok {
+		t.Fatal("AsPort should return false when no port available")
+	}
+}
+
+func TestAsServiceNonServiceResult(t *testing.T) {
+	_, ok := (Result{Type: ResultTypePort, Target: "10.0.0.1"}).AsService()
+	if ok {
+		t.Fatal("AsService should return false for non-service result")
+	}
+}
+
+func TestAsServiceNoUsefulFields(t *testing.T) {
+	_, ok := (Result{Type: ResultTypeService, Target: "10.0.0.1"}).AsService()
+	if ok {
+		t.Fatal("AsService should return false when no useful service fields")
+	}
+}
+
+func TestAsCredentialNonCredential(t *testing.T) {
+	_, ok := (Result{
+		Type:    ResultTypeVuln,
+		Target:  "10.0.0.1:445",
+		Details: map[string]interface{}{"vulnerability": "MS17-010"},
+	}).AsCredential()
+	if ok {
+		t.Fatal("AsCredential should return false for non-credential vuln")
+	}
+}
+
+func TestAsCredentialNoUsernamePassword(t *testing.T) {
+	_, ok := (Result{
+		Type:    ResultTypeVuln,
+		Target:  "10.0.0.1:22",
+		Status:  "weak_credential: ???",
+		Details: map[string]interface{}{},
+	}).AsCredential()
+	if ok {
+		t.Fatal("AsCredential should return false without username/password")
+	}
+}
+
+func TestAsVulnerabilityCredentialExcluded(t *testing.T) {
+	_, ok := (Result{
+		Type:   ResultTypeVuln,
+		Target: "10.0.0.1:22",
+		Details: map[string]interface{}{
+			"type":          "weak_credential",
+			"vulnerability": "ssh weak password",
+			"username":      "root",
+			"password":      "toor",
+		},
+	}).AsVulnerability()
+	if ok {
+		t.Fatal("AsVulnerability should exclude credential results")
+	}
+}
+
+func TestAsVulnerabilityEmptyVulnField(t *testing.T) {
+	_, ok := (Result{
+		Type:    ResultTypeVuln,
+		Target:  "10.0.0.1:445",
+		Details: map[string]interface{}{},
+	}).AsVulnerability()
+	if ok {
+		t.Fatal("AsVulnerability should return false without vulnerability field")
+	}
+}
+
 func TestSummarizeResults(t *testing.T) {
 	results := []Result{
 		{Type: ResultTypeHost, Target: "127.0.0.1"},
@@ -161,6 +283,13 @@ func TestSummarizeResults(t *testing.T) {
 	}
 }
 
+func TestSummarizeEmpty(t *testing.T) {
+	summary := SummarizeResults(nil)
+	if summary.Total != 0 {
+		t.Fatalf("Total = %d, want 0", summary.Total)
+	}
+}
+
 func TestResultDetailIntRejectsFraction(t *testing.T) {
 	result := Result{Details: map[string]interface{}{"port": 22.5}}
 
@@ -177,3 +306,413 @@ func TestResultDetailIntParsesJSONNumber(t *testing.T) {
 		t.Fatalf("DetailInt = %d/%v, want 443/true", port, ok)
 	}
 }
+
+func TestDetailIntTypes(t *testing.T) {
+	tests := []struct {
+		name  string
+		value interface{}
+		want  int
+		ok    bool
+	}{
+		{"int", int(42), 42, true},
+		{"int8", int8(8), 8, true},
+		{"int16", int16(16), 16, true},
+		{"int32", int32(32), 32, true},
+		{"int64", int64(64), 64, true},
+		{"uint", uint(10), 10, true},
+		{"uint8", uint8(8), 8, true},
+		{"uint16", uint16(16), 16, true},
+		{"uint32", uint32(32), 32, true},
+		{"uint64", uint64(64), 64, true},
+		{"float32", float32(80), 80, true},
+		{"float64", float64(443), 443, true},
+		{"string", "8080", 8080, true},
+		{"string-spaces", " 22 ", 22, true},
+		{"string-invalid", "abc", 0, false},
+		{"nil", nil, 0, false},
+		{"bool", true, 0, false},
+		{"missing", nil, 0, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := Result{Details: map[string]interface{}{"v": tt.value}}
+			if tt.name == "missing" {
+				r = Result{Details: map[string]interface{}{}}
+			}
+			got, ok := r.DetailInt("v")
+			if ok != tt.ok || got != tt.want {
+				t.Fatalf("DetailInt = %d/%v, want %d/%v", got, ok, tt.want, tt.ok)
+			}
+		})
+	}
+}
+
+func TestDetailIntOverflow(t *testing.T) {
+	if _, ok := (Result{Details: map[string]interface{}{"v": uint64(math.MaxUint64)}}).DetailInt("v"); ok {
+		t.Fatal("uint64 max should overflow")
+	}
+	if _, ok := (Result{Details: map[string]interface{}{"v": float64(1.5)}}).DetailInt("v"); ok {
+		t.Fatal("non-integer float should fail")
+	}
+}
+
+type testStringer struct{ s string }
+
+func (ts testStringer) String() string { return ts.s }
+
+func TestDetailStringStringer(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"k": testStringer{"hello"}}}
+	v, ok := r.DetailString("k")
+	if !ok || v != "hello" {
+		t.Fatalf("DetailString(Stringer) = %q/%v, want hello/true", v, ok)
+	}
+}
+
+func TestDetailStringFallback(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"k": 42}}
+	v, ok := r.DetailString("k")
+	if !ok || v != "42" {
+		t.Fatalf("DetailString(int) = %q/%v, want 42/true", v, ok)
+	}
+}
+
+func TestDetailStringNil(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"k": nil}}
+	_, ok := r.DetailString("k")
+	if ok {
+		t.Fatal("DetailString(nil) should return false")
+	}
+}
+
+func TestDetailStringMissing(t *testing.T) {
+	r := Result{Details: map[string]interface{}{}}
+	_, ok := r.DetailString("missing")
+	if ok {
+		t.Fatal("DetailString(missing) should return false")
+	}
+}
+
+func TestDetailIntStringer(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"v": testStringer{"99"}}}
+	got, ok := r.DetailInt("v")
+	if !ok || got != 99 {
+		t.Fatalf("DetailInt(Stringer) = %d/%v, want 99/true", got, ok)
+	}
+}
+
+func TestDetailBool(t *testing.T) {
+	tests := []struct {
+		name string
+		val  interface{}
+		want bool
+		ok   bool
+	}{
+		{"true", true, true, true},
+		{"false", false, false, true},
+		{"string-true", "true", true, true},
+		{"string-false", "false", false, true},
+		{"string-1", "1", true, true},
+		{"string-0", "0", false, true},
+		{"string-invalid", "maybe", false, false},
+		{"nil", nil, false, false},
+		{"int", 1, false, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := Result{Details: map[string]interface{}{"b": tt.val}}
+			got, ok := r.DetailBool("b")
+			if ok != tt.ok || got != tt.want {
+				t.Fatalf("DetailBool = %v/%v, want %v/%v", got, ok, tt.want, tt.ok)
+			}
+		})
+	}
+}
+
+func TestDetailBoolMissing(t *testing.T) {
+	r := Result{Details: map[string]interface{}{}}
+	_, ok := r.DetailBool("missing")
+	if ok {
+		t.Fatal("DetailBool(missing) should return false")
+	}
+}
+
+func TestIsWebViaProtocol(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"protocol": "https"}}
+	if !r.IsWeb() {
+		t.Fatal("expected web via protocol=https")
+	}
+}
+
+func TestIsWebViaService(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"service": "HTTP"}}
+	if !r.IsWeb() {
+		t.Fatal("expected web via service=HTTP (case-insensitive)")
+	}
+}
+
+func TestIsWebFalse(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"service": "ssh"}}
+	if r.IsWeb() {
+		t.Fatal("ssh should not be web")
+	}
+}
+
+func TestIsWebNoDetails(t *testing.T) {
+	r := Result{}
+	if r.IsWeb() {
+		t.Fatal("empty result should not be web")
+	}
+}
+
+func TestResultTypeHelpers(t *testing.T) {
+	if !(Result{Type: ResultTypeHost}).IsHost() {
+		t.Fatal("IsHost")
+	}
+	if !(Result{Type: ResultTypePort}).IsPort() {
+		t.Fatal("IsPort")
+	}
+	if !(Result{Type: ResultTypeService}).IsService() {
+		t.Fatal("IsService")
+	}
+	if !(Result{Type: ResultTypeVuln}).IsVuln() {
+		t.Fatal("IsVuln")
+	}
+	if (Result{Type: ResultTypeHost}).IsPort() {
+		t.Fatal("host should not be port")
+	}
+}
+
+func TestResultURLAndVulnerability(t *testing.T) {
+	r := Result{Details: map[string]interface{}{
+		"url":           "http://example.com",
+		"vulnerability": "CVE-2021-1234",
+	}}
+	if u, ok := r.URL(); !ok || u != "http://example.com" {
+		t.Fatalf("URL = %q/%v", u, ok)
+	}
+	if v, ok := r.Vulnerability(); !ok || v != "CVE-2021-1234" {
+		t.Fatalf("Vulnerability = %q/%v", v, ok)
+	}
+}
+
+func TestResultProtocol(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"protocol": "tcp"}}
+	if p, ok := r.Protocol(); !ok || p != "tcp" {
+		t.Fatalf("Protocol = %q/%v", p, ok)
+	}
+}
+
+func TestDetailIntNilDetails(t *testing.T) {
+	r := Result{}
+	_, ok := r.DetailInt("port")
+	if ok {
+		t.Fatal("DetailInt on nil details should return false")
+	}
+}
+
+func TestDetailStringNilDetails(t *testing.T) {
+	r := Result{}
+	_, ok := r.DetailString("service")
+	if ok {
+		t.Fatal("DetailString on nil details should return false")
+	}
+}
+
+func TestDetailBoolNilDetails(t *testing.T) {
+	r := Result{}
+	_, ok := r.DetailBool("is_web")
+	if ok {
+		t.Fatal("DetailBool on nil details should return false")
+	}
+}
+
+func TestIsWebExplicitBoolDetail(t *testing.T) {
+	r := Result{Details: map[string]interface{}{"is_web": true}}
+	if !r.IsWeb() {
+		t.Fatal("explicit is_web=true should mark as web")
+	}
+
+	r2 := Result{Details: map[string]interface{}{"is_web": false, "service": "http"}}
+	if r2.IsWeb() {
+		t.Fatal("explicit is_web=false should override service heuristic")
+	}
+}
+
+func TestIntFromInt64Overflow(t *testing.T) {
+	if _, ok := intFromInt64(math.MaxInt64); !ok {
+		t.Fatal("max int64 should fit on 64-bit")
+	}
+}
+
+func TestIntFromUint64Overflow(t *testing.T) {
+	if _, ok := intFromUint64(math.MaxUint64); ok {
+		t.Fatal("max uint64 should overflow int")
+	}
+	if v, ok := intFromUint64(0); !ok || v != 0 {
+		t.Fatalf("intFromUint64(0) = %d/%v", v, ok)
+	}
+}
+
+func TestIntFromFloat64NonInteger(t *testing.T) {
+	if _, ok := intFromFloat64(3.14); ok {
+		t.Fatal("non-integer float should fail")
+	}
+	if v, ok := intFromFloat64(100.0); !ok || v != 100 {
+		t.Fatalf("intFromFloat64(100.0) = %d/%v", v, ok)
+	}
+}
+
+func TestResultSummaryAddWebCredential(t *testing.T) {
+	var s ResultSummary
+	s.Add(Result{
+		Type:   ResultTypeVuln,
+		Target: "10.0.0.1:80",
+		Status: "weak_credential: admin:admin",
+		Details: map[string]interface{}{
+			"service":  "http",
+			"is_web":   true,
+			"username": "admin",
+			"password": "admin",
+		},
+	})
+	if s.Vulns != 1 || s.Web != 1 || s.Credentials != 1 {
+		t.Fatalf("summary = %+v, want vulns=1 web=1 credentials=1", s)
+	}
+}
+
+func TestAsServiceWithPortOnly(t *testing.T) {
+	sr, ok := (Result{
+		Type:    ResultTypeService,
+		Target:  "10.0.0.1:3306",
+		Details: map[string]interface{}{"port": 3306},
+	}).AsService()
+	if !ok || sr.Port != 3306 {
+		t.Fatalf("AsService with port only = %#v/%v", sr, ok)
+	}
+}
+
+func TestConvertOutputResultNil(t *testing.T) {
+	_, ok := convertOutputResult(nil)
+	if ok {
+		t.Fatal("convertOutputResult(nil) should return false")
+	}
+}
+
+func TestConvertOutputResultEmpty(t *testing.T) {
+	_, ok := convertOutputResult(&output.ScanResult{})
+	if ok {
+		t.Fatal("empty output result should return false")
+	}
+}
+
+func TestConvertOutputResultValid(t *testing.T) {
+	raw := &output.ScanResult{
+		Type:   output.ResultType(ResultTypePort),
+		Target: "10.0.0.1",
+		Status: "open",
+		Details: map[string]interface{}{
+			"port": 22,
+		},
+	}
+	r, ok := convertOutputResult(raw)
+	if !ok {
+		t.Fatal("expected valid conversion")
+	}
+	if r.Type != ResultTypePort || r.Target != "10.0.0.1" {
+		t.Fatalf("converted = %#v", r)
+	}
+}
+
+func TestResultJSON(t *testing.T) {
+	r := Result{
+		Type:   ResultTypePort,
+		Target: "10.0.0.1",
+		Status: "open",
+		Details: map[string]interface{}{
+			"port": 22,
+		},
+	}
+	data, err := json.Marshal(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var decoded Result
+	if err := json.Unmarshal(data, &decoded); err != nil {
+		t.Fatal(err)
+	}
+	if decoded.Type != ResultTypePort || decoded.Target != "10.0.0.1" {
+		t.Fatalf("round-trip failed: %#v", decoded)
+	}
+}
+
+func TestPortResultJSON(t *testing.T) {
+	pr := PortResult{Target: "10.0.0.1", Port: 80}
+	data, err := json.Marshal(pr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got := string(data); got != `{"target":"10.0.0.1","port":80}` {
+		t.Fatalf("PortResult JSON = %s", got)
+	}
+}
+
+func TestServiceResultJSON(t *testing.T) {
+	sr := ServiceResult{Target: "10.0.0.1:80", Port: 80, Service: "http", IsWeb: true}
+	data, err := json.Marshal(sr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var decoded ServiceResult
+	if err := json.Unmarshal(data, &decoded); err != nil {
+		t.Fatal(err)
+	}
+	if decoded.Service != "http" || !decoded.IsWeb {
+		t.Fatalf("round-trip failed: %#v", decoded)
+	}
+}
+
+func TestCredentialResultJSON(t *testing.T) {
+	cr := CredentialResult{Target: "10.0.0.1:22", Service: "ssh", Username: "root", Password: "toor"}
+	data, err := json.Marshal(cr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var decoded CredentialResult
+	if err := json.Unmarshal(data, &decoded); err != nil {
+		t.Fatal(err)
+	}
+	if decoded.Username != "root" || decoded.Password != "toor" {
+		t.Fatalf("round-trip failed: %#v", decoded)
+	}
+}
+
+func TestVulnerabilityResultJSON(t *testing.T) {
+	vr := VulnerabilityResult{Target: "10.0.0.1:445", Service: "smb", Vulnerability: "MS17-010"}
+	data, err := json.Marshal(vr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var decoded VulnerabilityResult
+	if err := json.Unmarshal(data, &decoded); err != nil {
+		t.Fatal(err)
+	}
+	if decoded.Vulnerability != "MS17-010" {
+		t.Fatalf("round-trip failed: %#v", decoded)
+	}
+}
+
+func TestResultSummaryJSON(t *testing.T) {
+	summary := ResultSummary{Total: 10, Hosts: 2, Ports: 3, Services: 3, Vulns: 2}
+	data, err := json.Marshal(summary)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var decoded ResultSummary
+	if err := json.Unmarshal(data, &decoded); err != nil {
+		t.Fatal(err)
+	}
+	if decoded.Total != 10 || decoded.Hosts != 2 {
+		t.Fatalf("round-trip failed: %#v", decoded)
+	}
+}
+

pkg/fscan/scanner.go

@@ -42,6 +42,7 @@ var defaultSafePlugins = []string{
 	"rsync",
 	"smb",
 	"smtp",
+	"snmp",
 	"ssh",
 	"telnet",
 	"vnc",
@@ -122,6 +123,10 @@ func PluginCapabilities(name string) []string {
 	return pluginCapabilities(name)
 }
 
+type scanOpts struct {
+	controller *ScanController
+}
+
 // Scan runs the scanner for the provided targets and returns structured
 // findings. If no targets are provided, Config.Targets is used.
 func (s *Scanner) Scan(ctx context.Context, targets ...Target) ([]Result, error) {
@@ -131,11 +136,40 @@ func (s *Scanner) Scan(ctx context.Context, targets ...Target) ([]Result, error)
 
 // ScanReport runs the scanner and returns results with summary and runtime stats.
 func (s *Scanner) ScanReport(ctx context.Context, targets ...Target) (ScanReport, error) {
+	return s.collectReport(ctx, scanOpts{}, targets...)
+}
+
+// ScanEach runs the scanner and calls handle serially for each structured
+// result without retaining all results in memory. If handle returns an error,
+// the scan context is canceled and that error is returned.
+func (s *Scanner) ScanEach(ctx context.Context, handle ResultHandler, targets ...Target) error {
+	_, err := s.scanEach(ctx, scanOpts{}, handle, targets...)
+	return err
+}
+
+// ScanWithController starts a scan and returns a controller for pause/resume
+// and live stats. The scan runs in a background goroutine; read the returned
+// channels to get the report and error when the scan completes.
+func (s *Scanner) ScanWithController(ctx context.Context, targets ...Target) (*ScanController, <-chan ScanReport, <-chan error) {
+	ctrl := newScanController()
+	reportCh := make(chan ScanReport, 1)
+	errCh := make(chan error, 1)
+
+	go func() {
+		report, err := s.collectReport(ctx, scanOpts{controller: ctrl}, targets...)
+		reportCh <- report
+		errCh <- err
+	}()
+
+	return ctrl, reportCh, errCh
+}
+
+func (s *Scanner) collectReport(ctx context.Context, opts scanOpts, targets ...Target) (ScanReport, error) {
 	var (
 		mu      sync.Mutex
 		results []Result
 	)
-	stats, err := s.scanEach(ctx, func(result Result) error {
+	stats, err := s.scanEach(ctx, opts, func(result Result) error {
 		mu.Lock()
 		results = append(results, result)
 		mu.Unlock()
@@ -149,15 +183,7 @@ func (s *Scanner) ScanReport(ctx context.Context, targets ...Target) (ScanReport
 	}, err
 }
 
-// ScanEach runs the scanner and calls handle serially for each structured
+func (s *Scanner) scanEach(ctx context.Context, opts scanOpts, handle ResultHandler, targets ...Target) (ScanStats, error) {
-// result without retaining all results in memory. If handle returns an error,
-// the scan context is canceled and that error is returned.
-func (s *Scanner) ScanEach(ctx context.Context, handle ResultHandler, targets ...Target) error {
-	_, err := s.scanEach(ctx, handle, targets...)
-	return err
-}
-
-func (s *Scanner) scanEach(ctx context.Context, handle ResultHandler, targets ...Target) (ScanStats, error) {
 	if handle == nil {
 		return ScanStats{}, fmt.Errorf("fscan: result handler is required")
 	}
@@ -171,11 +197,34 @@ func (s *Scanner) scanEach(ctx context.Context, handle ResultHandler, targets ..
 		return ScanStats{}, err
 	}
 
+	ctrl := opts.controller
+	if ctrl == nil && s.config.OnProgress != nil {
+		ctrl = newScanController()
+	}
+
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 	restoreLogger := common.PushSilentLogger()
 	defer restoreLogger()
 
+	if ctrl != nil && s.config.OnProgress != nil {
+		progressCtx, progressCancel := context.WithCancel(ctx)
+		defer progressCancel()
+		onProgress := s.config.OnProgress
+		go func() {
+			ticker := time.NewTicker(500 * time.Millisecond)
+			defer ticker.Stop()
+			for {
+				select {
+				case <-ticker.C:
+					onProgress(ctrl.progress())
+				case <-progressCtx.Done():
+					return
+				}
+			}
+		}()
+	}
+
 	var (
 		errMu      sync.Mutex
 		handleMu   sync.Mutex
@@ -192,6 +241,7 @@ func (s *Scanner) scanEach(ctx context.Context, handle ResultHandler, targets ..
 		}
 		sink := func(raw *output.ScanResult) error {
 			if result, ok := convertOutputResult(raw); ok {
+				s.injectTaskID(&result)
 				handleMu.Lock()
 				if err := handle(result); err != nil {
 					handleMu.Unlock()
@@ -206,7 +256,7 @@ func (s *Scanner) scanEach(ctx context.Context, handle ResultHandler, targets ..
 			}
 			return nil
 		}
-		report, err := s.scanOne(ctx, target, sink)
+		report, err := s.scanOne(ctx, target, sink, opts)
 		stats.add(coreStatsToSDK(report))
 		if err != nil {
 			if stored := getHandlerError(&errMu, &handlerErr); stored != nil {
@@ -225,7 +275,17 @@ func (s *Scanner) scanEach(ctx context.Context, handle ResultHandler, targets ..
 	return stats, ctx.Err()
 }
 
-func (s *Scanner) scanOne(ctx context.Context, target Target, sink common.ResultSink) (core.ScanReport, error) {
+func (s *Scanner) injectTaskID(result *Result) {
+	if s.config.TaskID == "" {
+		return
+	}
+	if result.Details == nil {
+		result.Details = make(map[string]interface{})
+	}
+	result.Details["task_id"] = s.config.TaskID
+}
+
+func (s *Scanner) scanOne(ctx context.Context, target Target, sink common.ResultSink, opts scanOpts) (core.ScanReport, error) {
 	fv := buildFlagVars(s.config, target)
 	info := common.HostInfo{Host: strings.TrimSpace(target.Host), URL: strings.TrimSpace(target.URL)}
 
@@ -255,6 +315,12 @@ func (s *Scanner) scanOne(ctx context.Context, target Target, sink common.Result
 
 	session := common.NewScanSession(cfg, state, fv)
 	session.ResultSink = sink
+
+	if opts.controller != nil {
+		session.PauseGate = opts.controller.pauseGate
+		opts.controller.addState(state)
+	}
+
 	return core.RunScan(ctx, info, session)
 }
 
@@ -409,8 +475,8 @@ func normalizePlugins(pluginNames []string) []string {
 }
 
 func pluginTypes(name string) []string {
-	types := make([]string, 0, 3)
+	types := make([]string, 0, 4)
-	for _, pluginType := range []string{PluginTypeService, PluginTypeWeb, PluginTypeLocal} {
+	for _, pluginType := range []string{PluginTypeService, PluginTypeWeb, PluginTypeLocal, PluginTypeUDP} {
 		if plugins.HasType(name, pluginType) {
 			types = append(types, pluginType)
 		}
@@ -431,7 +497,7 @@ func pluginCapabilities(name string) []string {
 		capSet[capability] = struct{}{}
 	}
 
-	if plugins.HasType(name, PluginTypeService) || plugins.HasType(name, PluginTypeWeb) {
+	if plugins.HasType(name, PluginTypeService) || plugins.HasType(name, PluginTypeWeb) || plugins.HasType(name, PluginTypeUDP) {
 		add(PluginCapabilityDetect)
 	}
 	if serviceAuthPlugins[name] {
@@ -484,6 +550,7 @@ var serviceAuthPlugins = map[string]bool{
 	"rsync":         true,
 	"smb":           true,
 	"smtp":          true,
+	"snmp":          true,
 	"ssh":           true,
 	"telnet":        true,
 	"vnc":           true,

pkg/fscan/scanner_test.go

@@ -575,3 +575,280 @@ func hasPortResult(results []Result, port int) bool {
 	}
 	return false
 }
+
+func TestDefaultSafePluginsReturnsIndependentCopy(t *testing.T) {
+	a := DefaultSafePlugins()
+	b := DefaultSafePlugins()
+	if len(a) == 0 {
+		t.Fatal("empty default safe plugins")
+	}
+	a[0] = "MODIFIED"
+	if b[0] == "MODIFIED" {
+		t.Fatal("DefaultSafePlugins returned shared slice")
+	}
+}
+
+func TestGetPluginWhitespaceAndEmpty(t *testing.T) {
+	if _, ok := GetPlugin(""); ok {
+		t.Fatal("empty name should not exist")
+	}
+	if _, ok := GetPlugin("   "); ok {
+		t.Fatal("whitespace name should not exist")
+	}
+	if info, ok := GetPlugin(" ssh "); !ok || info.Name != "ssh" {
+		t.Fatalf("trimmed lookup failed: %#v/%v", info, ok)
+	}
+}
+
+func TestPluginCapabilitiesEmpty(t *testing.T) {
+	if caps := PluginCapabilities(""); caps != nil {
+		t.Fatalf("empty name caps = %#v, want nil", caps)
+	}
+	if caps := PluginCapabilities("definitely-missing"); caps != nil {
+		t.Fatalf("missing plugin caps = %#v, want nil", caps)
+	}
+}
+
+func TestIsSafePluginWhitespace(t *testing.T) {
+	if IsSafePlugin("") {
+		t.Fatal("empty should not be safe")
+	}
+	if IsSafePlugin("   ") {
+		t.Fatal("whitespace should not be safe")
+	}
+	if !IsSafePlugin(" ssh ") {
+		t.Fatal("trimmed ssh should be safe")
+	}
+}
+
+func TestValidateConfigPortOnConfig(t *testing.T) {
+	if err := validateConfig(Config{Ports: []int{0}}, []Target{{Host: "127.0.0.1"}}); err == nil {
+		t.Fatal("expected invalid config port error for port 0")
+	}
+	if err := validateConfig(Config{Ports: []int{99999}}, []Target{{Host: "127.0.0.1"}}); err == nil {
+		t.Fatal("expected invalid config port error for port 99999")
+	}
+}
+
+func TestValidateConfigEmptyTarget(t *testing.T) {
+	if err := validateConfig(Config{}, []Target{{}}); err == nil {
+		t.Fatal("expected empty target error")
+	}
+}
+
+func TestBuildFlagVarsCustomValues(t *testing.T) {
+	config := Config{
+		Timeout:         10 * time.Second,
+		WebTimeout:      15 * time.Second,
+		Threads:         100,
+		ModuleThreads:   50,
+		MaxRetries:      5,
+		MaxRedirects:    3,
+		POCConcurrency:  10,
+		ICMPRate:        0.5,
+		DisablePing:     true,
+		DisableTCPProbe: true,
+		DisableBrute:    true,
+		Domain:          "WORKGROUP",
+		SSHKeyPath:      "/tmp/id_rsa",
+		HTTPProxy:       "http://proxy:8080",
+		Socks5Proxy:     "127.0.0.1:1080",
+		Interface:       "eth0",
+		POCPath:         "/tmp/pocs",
+		POCName:         "test-poc",
+		POCFull:         true,
+		DisablePOCScan:  true,
+		Language:        "zh",
+		Usernames:       []string{"admin", "root"},
+		Passwords:       []string{"pass1", "pass2"},
+	}
+	fv := buildFlagVars(config, Target{Host: "10.0.0.1"})
+
+	if fv.TimeoutSec != 10 {
+		t.Fatalf("TimeoutSec = %d, want 10", fv.TimeoutSec)
+	}
+	if fv.WebTimeout != 15 {
+		t.Fatalf("WebTimeout = %d, want 15", fv.WebTimeout)
+	}
+	if fv.ThreadNum != 100 {
+		t.Fatalf("ThreadNum = %d, want 100", fv.ThreadNum)
+	}
+	if fv.ModuleThreadNum != 50 {
+		t.Fatalf("ModuleThreadNum = %d, want 50", fv.ModuleThreadNum)
+	}
+	if fv.MaxRetries != 5 {
+		t.Fatalf("MaxRetries = %d, want 5", fv.MaxRetries)
+	}
+	if fv.MaxRedirects != 3 {
+		t.Fatalf("MaxRedirects = %d, want 3", fv.MaxRedirects)
+	}
+	if fv.PocNum != 10 {
+		t.Fatalf("PocNum = %d, want 10", fv.PocNum)
+	}
+	if fv.ICMPRate != 0.5 {
+		t.Fatalf("ICMPRate = %f, want 0.5", fv.ICMPRate)
+	}
+	if !fv.DisablePing {
+		t.Fatal("DisablePing should be true")
+	}
+	if !fv.DisableTcpProbe {
+		t.Fatal("DisableTcpProbe should be true")
+	}
+	if !fv.DisableBrute {
+		t.Fatal("DisableBrute should be true")
+	}
+	if fv.Domain != "WORKGROUP" {
+		t.Fatalf("Domain = %q", fv.Domain)
+	}
+	if fv.SSHKeyPath != "/tmp/id_rsa" {
+		t.Fatalf("SSHKeyPath = %q", fv.SSHKeyPath)
+	}
+	if fv.HTTPProxy != "http://proxy:8080" {
+		t.Fatalf("HTTPProxy = %q", fv.HTTPProxy)
+	}
+	if fv.Socks5Proxy != "127.0.0.1:1080" {
+		t.Fatalf("Socks5Proxy = %q", fv.Socks5Proxy)
+	}
+	if fv.Iface != "eth0" {
+		t.Fatalf("Iface = %q", fv.Iface)
+	}
+	if fv.PocPath != "/tmp/pocs" {
+		t.Fatalf("PocPath = %q", fv.PocPath)
+	}
+	if fv.PocName != "test-poc" {
+		t.Fatalf("PocName = %q", fv.PocName)
+	}
+	if !fv.PocFull {
+		t.Fatal("PocFull should be true")
+	}
+	if !fv.DisablePocScan {
+		t.Fatal("DisablePocScan should be true")
+	}
+	if fv.Language != "zh" {
+		t.Fatalf("Language = %q", fv.Language)
+	}
+	if fv.Username != "admin,root" {
+		t.Fatalf("Username = %q", fv.Username)
+	}
+	if fv.Password != "pass1,pass2" {
+		t.Fatalf("Password = %q", fv.Password)
+	}
+}
+
+func TestBuildFlagVarsURLTarget(t *testing.T) {
+	fv := buildFlagVars(Config{}, Target{URL: "https://example.com"})
+	if fv.TargetURL != "https://example.com" {
+		t.Fatalf("TargetURL = %q", fv.TargetURL)
+	}
+	if fv.Host != "" {
+		t.Fatalf("Host should be empty for URL target, got %q", fv.Host)
+	}
+}
+
+func TestFormatPortsEmpty(t *testing.T) {
+	result := formatPorts(nil)
+	if result != commonconfig.MainPorts {
+		t.Fatalf("formatPorts(nil) = %q, want MainPorts", result)
+	}
+}
+
+func TestFormatPortsSorted(t *testing.T) {
+	result := formatPorts([]int{443, 22, 80})
+	if result != "22,80,443" {
+		t.Fatalf("formatPorts = %q, want sorted", result)
+	}
+}
+
+func TestFormatPluginsAllowUnsafe(t *testing.T) {
+	result := formatPlugins(Config{AllowUnsafePlugins: true})
+	if result != "all" {
+		t.Fatalf("formatPlugins(unsafe) = %q, want all", result)
+	}
+}
+
+func TestFormatPluginsExplicit(t *testing.T) {
+	result := formatPlugins(Config{Plugins: []string{"ssh", "ftp"}})
+	if result != "ssh,ftp" {
+		t.Fatalf("formatPlugins = %q, want ssh,ftp", result)
+	}
+}
+
+func TestNormalizePluginsTrimsWhitespace(t *testing.T) {
+	result := normalizePlugins([]string{" ssh ", "", " ftp "})
+	if len(result) != 2 || result[0] != "ssh" || result[1] != "ftp" {
+		t.Fatalf("normalizePlugins = %#v", result)
+	}
+}
+
+func TestSecondsOrDefault(t *testing.T) {
+	if got := secondsOrDefault(0, 3); got != 3 {
+		t.Fatalf("secondsOrDefault(0, 3) = %d, want 3", got)
+	}
+	if got := secondsOrDefault(-1*time.Second, 5); got != 5 {
+		t.Fatalf("secondsOrDefault(-1s, 5) = %d, want 5", got)
+	}
+	if got := secondsOrDefault(10*time.Second, 3); got != 10 {
+		t.Fatalf("secondsOrDefault(10s, 3) = %d, want 10", got)
+	}
+	if got := secondsOrDefault(500*time.Millisecond, 3); got != 1 {
+		t.Fatalf("secondsOrDefault(500ms, 3) = %d, want 1", got)
+	}
+}
+
+func TestSNMPPluginRegistration(t *testing.T) {
+	info, ok := GetPlugin("snmp")
+	if !ok {
+		t.Fatal("snmp plugin not registered")
+	}
+	if !info.Safe {
+		t.Fatal("snmp should be safe")
+	}
+	if !info.Default {
+		t.Fatal("snmp should be in default safe plugins")
+	}
+	if !containsString(info.Types, PluginTypeUDP) {
+		t.Fatalf("snmp types = %#v, want udp", info.Types)
+	}
+	if containsString(info.Types, PluginTypeService) {
+		t.Fatal("snmp should not be service type")
+	}
+	if !containsInt(info.Ports, 161) {
+		t.Fatalf("snmp ports = %#v, want 161", info.Ports)
+	}
+	if !containsString(info.Capabilities, PluginCapabilityDetect) {
+		t.Fatalf("snmp capabilities = %#v, want detect", info.Capabilities)
+	}
+}
+
+func TestScanStatsAdd(t *testing.T) {
+	var s ScanStats
+	s.add(ScanStats{
+		Duration:       2 * time.Second,
+		TasksTotal:     10,
+		TasksCompleted: 8,
+		Packets:        100,
+		TCPPackets:     80,
+		UDPPackets:     20,
+		HTTPPackets:    5,
+	})
+	s.add(ScanStats{
+		Duration:       3 * time.Second,
+		TasksTotal:     5,
+		TasksCompleted: 5,
+		Packets:        50,
+		TCPPackets:     40,
+		UDPPackets:     10,
+	})
+	if s.Duration != 5*time.Second {
+		t.Fatalf("Duration = %s, want 5s", s.Duration)
+	}
+	if s.TasksTotal != 15 || s.TasksCompleted != 13 {
+		t.Fatalf("Tasks = %d/%d, want 15/13", s.TasksTotal, s.TasksCompleted)
+	}
+	if s.Packets != 150 || s.TCPPackets != 120 || s.UDPPackets != 30 {
+		t.Fatalf("Packets = %d/%d/%d", s.Packets, s.TCPPackets, s.UDPPackets)
+	}
+	if s.HTTPPackets != 5 {
+		t.Fatalf("HTTPPackets = %d, want 5", s.HTTPPackets)
+	}
+}

pkg/fscan/types.go

@@ -11,6 +11,8 @@ const (
 	PluginTypeLocal = "local"
 	// PluginTypeService marks network service plugins.
 	PluginTypeService = "service"
+	// PluginTypeUDP marks UDP protocol plugins that bypass TCP port scanning.
+	PluginTypeUDP = "udp"
 )
 
 const (
@@ -86,6 +88,17 @@ type ScanStats struct {
 	ResourceExhausted int64         `json:"resource_exhausted"`
 }
 
+// ScanProgress reports live scan progress for Agent integrations.
+type ScanProgress struct {
+	TasksTotal     int64         `json:"tasks_total"`
+	TasksCompleted int64         `json:"tasks_completed"`
+	Duration       time.Duration `json:"duration"`
+	Packets        int64         `json:"packets"`
+	TCPPackets     int64         `json:"tcp_packets"`
+	HTTPPackets    int64         `json:"http_packets"`
+	Paused         bool          `json:"paused"`
+}
+
 // ScanReport returns structured results with summary and runtime counters.
 type ScanReport struct {
 	Results []Result      `json:"results"`
@@ -110,6 +123,10 @@ type Config struct {
 	AllowUnsafePlugins bool
 	// OnResult is called for every structured result as it is discovered.
 	OnResult func(Result)
+	// OnProgress is called periodically with live scan progress.
+	OnProgress func(ScanProgress)
+	// TaskID is injected into every Result.Details["task_id"] when non-empty.
+	TaskID string
 
 	Timeout       time.Duration
 	Threads       int

plugins/init.go

@@ -92,6 +92,7 @@ const (
 	PluginTypeWeb     = "web"     // Web类型插件
 	PluginTypeLocal   = "local"   // 本地类型插件
 	PluginTypeService = "service" // 服务类型插件
+	PluginTypeUDP     = "udp"     // UDP协议插件，跳过TCP端口扫描
 )
 
 var (
@@ -122,6 +123,16 @@ func RegisterWithPorts(name string, factory func() Plugin, ports []int) {
 	RegisterWithTypes(name, factory, ports, []string{PluginTypeService})
 }
 
+// RegisterUDPWithPorts 注册UDP协议插件，跳过TCP端口扫描链路
+func RegisterUDPWithPorts(name string, factory func() Plugin, ports []int) {
+	RegisterWithTypes(name, factory, ports, []string{PluginTypeUDP})
+}
+
+// IsUDP 检查插件是否为UDP协议插件
+func IsUDP(pluginName string) bool {
+	return HasType(pluginName, PluginTypeUDP)
+}
+
 // RegisterWithTypes 注册带类型标签的插件
 func RegisterWithTypes(name string, factory func() Plugin, ports []int, types []string) {
 	RegisterWithOptions(name, factory, ports, types, !hasPluginType(types, PluginTypeLocal))

plugins/services/snmp.go

@@ -0,0 +1,256 @@
+//go:build plugin_snmp || !plugin_selective
+
+package services
+
+import (
+	"context"
+	"encoding/asn1"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/shadow1ng/fscan/common"
+	"github.com/shadow1ng/fscan/plugins"
+)
+
+type SNMPPlugin struct {
+	plugins.BasePlugin
+}
+
+func NewSNMPPlugin() *SNMPPlugin {
+	return &SNMPPlugin{BasePlugin: plugins.NewBasePlugin("snmp")}
+}
+
+func (p *SNMPPlugin) Scan(ctx context.Context, info *common.HostInfo, session *common.ScanSession) *ScanResult {
+	config := session.Config
+	timeout := time.Duration(config.Timeout.Seconds()) * time.Second
+	if timeout <= 0 {
+		timeout = 3 * time.Second
+	}
+
+	target := fmt.Sprintf("%s:%d", info.Host, info.Port)
+
+	result := p.probe(ctx, target, "public", timeout, session)
+	if result == nil {
+		return &ScanResult{Success: false, Service: "snmp"}
+	}
+
+	if config.DisableBrute {
+		return result
+	}
+
+	communities := p.buildCommunityList(config)
+	var found []string
+	for _, community := range communities {
+		select {
+		case <-ctx.Done():
+			return result
+		default:
+		}
+		if r := p.probe(ctx, target, community, timeout, session); r != nil && r.Success {
+			found = append(found, community)
+		}
+	}
+
+	if len(found) > 0 {
+		return &ScanResult{
+			Success:  true,
+			Type:     plugins.ResultTypeCredential,
+			Service:  "snmp",
+			Password: strings.Join(found, ","),
+			Banner:   result.Banner,
+		}
+	}
+	return result
+}
+
+func (p *SNMPPlugin) probe(ctx context.Context, target, community string, timeout time.Duration, session *common.ScanSession) *ScanResult {
+	conn, err := session.DialUDP(ctx, target, timeout)
+	if err != nil {
+		return nil
+	}
+	defer conn.Close()
+
+	pkt := buildSNMPGetRequest(community, []int{1, 3, 6, 1, 2, 1, 1, 1, 0})
+	if _, err := conn.Write(pkt); err != nil {
+		return nil
+	}
+
+	buf := make([]byte, 1500)
+	n, err := conn.Read(buf)
+	if err != nil {
+		return nil
+	}
+
+	sysDescr := parseSNMPResponse(buf[:n])
+	if sysDescr == "" {
+		return nil
+	}
+
+	return &ScanResult{
+		Success: true,
+		Type:    plugins.ResultTypeService,
+		Service: "snmp",
+		Banner:  fmt.Sprintf("community=%s sysDescr=%s", community, sysDescr),
+	}
+}
+
+func (p *SNMPPlugin) buildCommunityList(config *common.Config) []string {
+	defaults := []string{"public", "private", "community", "manager", "monitor", "admin", "snmp", "default"}
+
+	passwords := config.Credentials.Passwords
+	if len(passwords) > 0 {
+		seen := make(map[string]struct{}, len(defaults)+len(passwords))
+		var merged []string
+		for _, c := range append(defaults, passwords...) {
+			if _, ok := seen[c]; !ok {
+				seen[c] = struct{}{}
+				merged = append(merged, c)
+			}
+		}
+		return merged
+	}
+	return defaults
+}
+
+// SNMPv2c GetRequest 编码
+func buildSNMPGetRequest(community string, oid []int) []byte {
+	requestID := int(time.Now().UnixNano() & 0x7FFFFFFF)
+
+	varbind, _ := asn1.Marshal(asn1.RawValue{
+		Class:      asn1.ClassUniversal,
+		Tag:        asn1.TagSequence,
+		IsCompound: true,
+		Bytes:      marshalOIDWithNull(oid),
+	})
+
+	varbindList, _ := asn1.Marshal(asn1.RawValue{
+		Class:      asn1.ClassUniversal,
+		Tag:        asn1.TagSequence,
+		IsCompound: true,
+		Bytes:      varbind,
+	})
+
+	reqIDBytes, _ := asn1.Marshal(requestID)
+	errorStatusBytes, _ := asn1.Marshal(0)
+	errorIndexBytes, _ := asn1.Marshal(0)
+
+	var pduContent []byte
+	pduContent = append(pduContent, reqIDBytes...)
+	pduContent = append(pduContent, errorStatusBytes...)
+	pduContent = append(pduContent, errorIndexBytes...)
+	pduContent = append(pduContent, varbindList...)
+
+	pdu := asn1.RawValue{
+		Class:      asn1.ClassContextSpecific,
+		Tag:        0, // GetRequest-PDU
+		IsCompound: true,
+		Bytes:      pduContent,
+	}
+	pduBytes, _ := asn1.Marshal(pdu)
+
+	versionBytes, _ := asn1.Marshal(1) // SNMPv2c
+	communityBytes, _ := asn1.Marshal([]byte(community))
+
+	var messageContent []byte
+	messageContent = append(messageContent, versionBytes...)
+	messageContent = append(messageContent, communityBytes...)
+	messageContent = append(messageContent, pduBytes...)
+
+	message, _ := asn1.Marshal(asn1.RawValue{
+		Class:      asn1.ClassUniversal,
+		Tag:        asn1.TagSequence,
+		IsCompound: true,
+		Bytes:      messageContent,
+	})
+	return message
+}
+
+func marshalOIDWithNull(oid []int) []byte {
+	oidBytes, _ := asn1.Marshal(asn1.ObjectIdentifier(oid))
+	nullBytes, _ := asn1.Marshal(asn1.RawValue{Class: asn1.ClassUniversal, Tag: asn1.TagNull})
+	var result []byte
+	result = append(result, oidBytes...)
+	result = append(result, nullBytes...)
+	return result
+}
+
+func parseSNMPResponse(data []byte) string {
+	var message asn1.RawValue
+	if _, err := asn1.Unmarshal(data, &message); err != nil {
+		return ""
+	}
+	if message.Tag != asn1.TagSequence {
+		return ""
+	}
+
+	rest := message.Bytes
+	// version
+	var version asn1.RawValue
+	rest, _ = asn1.Unmarshal(rest, &version)
+	if len(rest) == 0 {
+		return ""
+	}
+	// community
+	var community asn1.RawValue
+	rest, _ = asn1.Unmarshal(rest, &community)
+	if len(rest) == 0 {
+		return ""
+	}
+	// PDU (GetResponse = context-specific tag 2)
+	var pdu asn1.RawValue
+	if _, err := asn1.Unmarshal(rest, &pdu); err != nil {
+		return ""
+	}
+
+	pduRest := pdu.Bytes
+	// skip requestID, errorStatus, errorIndex
+	for i := 0; i < 3; i++ {
+		var skip asn1.RawValue
+		var err error
+		pduRest, err = asn1.Unmarshal(pduRest, &skip)
+		if err != nil || len(pduRest) == 0 {
+			return ""
+		}
+	}
+
+	// varbindList -> varbind -> (oid, value)
+	var varbindList asn1.RawValue
+	if _, err := asn1.Unmarshal(pduRest, &varbindList); err != nil {
+		return ""
+	}
+	var varbind asn1.RawValue
+	if _, err := asn1.Unmarshal(varbindList.Bytes, &varbind); err != nil {
+		return ""
+	}
+
+	vbRest := varbind.Bytes
+	// skip OID
+	var oidVal asn1.RawValue
+	vbRest, _ = asn1.Unmarshal(vbRest, &oidVal)
+	if len(vbRest) == 0 {
+		return ""
+	}
+
+	// value
+	var value asn1.RawValue
+	if _, err := asn1.Unmarshal(vbRest, &value); err != nil {
+		return ""
+	}
+
+	if value.Tag == asn1.TagOctetString || value.Tag == asn1.TagUTF8String {
+		s := strings.TrimSpace(string(value.Bytes))
+		if len(s) > 200 {
+			s = s[:200]
+		}
+		return s
+	}
+	return fmt.Sprintf("(type=%d, len=%d)", value.Tag, len(value.Bytes))
+}
+
+func init() {
+	RegisterUDPPluginWithPorts("snmp", func() Plugin {
+		return NewSNMPPlugin()
+	}, []int{161})
+}
+

plugins/services/types.go

@@ -25,4 +25,11 @@ func RegisterPluginWithPorts(name string, factory func() Plugin, ports []int) {
 	}, ports)
 }
 
+// RegisterUDPPluginWithPorts 注册UDP协议插件
+func RegisterUDPPluginWithPorts(name string, factory func() Plugin, ports []int) {
+	plugins.RegisterUDPWithPorts(name, func() plugins.Plugin {
+		return factory()
+	}, ports)
+}
+
 var GenerateCredentials = plugins.GenerateCredentials