feat: add check-port CLI command to verify open ports on domains

cmd/check_port.go

@@ -0,0 +1,50 @@
+package cmd
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"time"
+
+	"github.com/spf13/cobra"
+	"stackroost/internal"
+	"stackroost/internal/logger"
+)
+
+var checkPortCmd = &cobra.Command{
+	Use:   "check-port",
+	Short: "Check if a specific port is open for a domain",
+	Run: func(cmd *cobra.Command, args []string) {
+		domain, _ := cmd.Flags().GetString("domain")
+		port, _ := cmd.Flags().GetString("port")
+		timeoutSec, _ := cmd.Flags().GetInt("timeout")
+
+		if internal.IsNilOrEmpty(domain) || internal.IsNilOrEmpty(port) {
+			logger.Error("Please provide both --domain and --port")
+			os.Exit(1)
+		}
+
+		address := fmt.Sprintf("%s:%s", domain, port)
+		timeout := time.Duration(timeoutSec) * time.Second
+
+		logger.Info(fmt.Sprintf("Checking port %s on domain %s...", port, domain))
+
+		conn, err := net.DialTimeout("tcp", address, timeout)
+		if err != nil {
+			logger.Error(fmt.Sprintf("Port %s is not reachable on %s (%v)", port, domain, err))
+			os.Exit(1)
+		}
+		conn.Close()
+
+		logger.Success(fmt.Sprintf("Port %s is open and reachable on %s", port, domain))
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(checkPortCmd)
+	checkPortCmd.Flags().String("domain", "", "Domain to check")
+	checkPortCmd.Flags().String("port", "", "Port to check (e.g., 80, 443, 3000)")
+	checkPortCmd.Flags().Int("timeout", 3, "Timeout in seconds (default: 3s)")
+	checkPortCmd.MarkFlagRequired("domain")
+	checkPortCmd.MarkFlagRequired("port")
+}