feat: 新增 sys.uptime/net.iface/net.conn/net.speed/proc.tree/file.empty/user.info 命令

internal/executor/netconn.go

@@ -0,0 +1,125 @@
+package executor
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"os/exec"
+	"runtime"
+	"sort"
+	"strings"
+)
+
+// runNetConn implements `kopsc net conn`: show network connection statistics.
+func runNetConn(ctx context.Context, req BuiltinRequest) error {
+	switch runtime.GOOS {
+	case "linux":
+		return netConnLinux(ctx, req)
+	case "darwin":
+		return netConnDarwin(ctx, req)
+	case "windows":
+		return netConnWindows(ctx, req)
+	default:
+		return fmt.Errorf("不支持的操作系统: %s", runtime.GOOS)
+	}
+}
+
+func netConnLinux(ctx context.Context, req BuiltinRequest) error {
+	// Try ss first (faster)
+	if path, err := exec.LookPath("ss"); err == nil {
+		return netConnSS(ctx, path, req)
+	}
+	// Fallback to netstat
+	return netConnNetstat(ctx, req)
+}
+
+func netConnSS(ctx context.Context, path string, req BuiltinRequest) error {
+	out, err := exec.CommandContext(ctx, path, "-tan").Output()
+	if err != nil {
+		return fmt.Errorf("ss 执行失败: %w", err)
+	}
+	return parseNetstatOutput(string(out), req)
+}
+
+func netConnNetstat(ctx context.Context, req BuiltinRequest) error {
+	out, err := exec.CommandContext(ctx, "netstat", "-tan").Output()
+	if err != nil {
+		return fmt.Errorf("netstat 执行失败: %w", err)
+	}
+	return parseNetstatOutput(string(out), req)
+}
+
+func netConnDarwin(ctx context.Context, req BuiltinRequest) error {
+	out, err := exec.CommandContext(ctx, "netstat", "-tan").Output()
+	if err != nil {
+		return fmt.Errorf("netstat 执行失败: %w", err)
+	}
+	return parseNetstatOutput(string(out), req)
+}
+
+func netConnWindows(ctx context.Context, req BuiltinRequest) error {
+	out, err := exec.CommandContext(ctx, "netstat", "-an").Output()
+	if err != nil {
+		return fmt.Errorf("netstat 执行失败: %w", err)
+	}
+	return parseNetstatOutput(string(out), req)
+}
+
+func parseNetstatOutput(output string, req BuiltinRequest) error {
+	stats := make(map[string]int)
+	total := 0
+
+	scanner := bufio.NewScanner(strings.NewReader(output))
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" {
+			continue
+		}
+		fields := strings.Fields(line)
+		if len(fields) < 4 {
+			continue
+		}
+
+		// Detect state column (usually last for TCP)
+		state := fields[len(fields)-1]
+		if isConnectionState(state) {
+			stats[state]++
+			total++
+		}
+	}
+
+	if total == 0 {
+		fmt.Fprintln(req.Stdout, "没有活动的 TCP 连接")
+		return nil
+	}
+
+	fmt.Fprintf(req.Stdout, "=== TCP 连接统计 (共 %d 个) ===\n\n", total)
+
+	// Sort by count descending
+	type stateCount struct {
+		state string
+		count int
+	}
+	var sorted []stateCount
+	for state, count := range stats {
+		sorted = append(sorted, stateCount{state, count})
+	}
+	sort.Slice(sorted, func(i, j int) bool {
+		return sorted[i].count > sorted[j].count
+	})
+
+	for _, sc := range sorted {
+		fmt.Fprintf(req.Stdout, "%-15s %d\n", sc.state, sc.count)
+	}
+
+	return nil
+}
+
+func isConnectionState(s string) bool {
+	switch s {
+	case "ESTABLISHED", "SYN_SENT", "SYN_RECV", "FIN_WAIT1", "FIN_WAIT2",
+		"TIME_WAIT", "CLOSE", "CLOSE_WAIT", "LAST_ACK", "LISTEN", "CLOSING":
+		return true
+	}
+	return false
+}