feat: add masscan discovery backend (#403)

cmd/cameradar/cameradar.go

@@ -79,6 +79,7 @@ func runCameradar(ctx context.Context, cmd *cli.Command) error {
 			routesPath,
 			credsPath,
 			outputPath,
+			cmd.String(flagScanner),
 			cmd.Int16(flagScanSpeed),
 			cmd.Duration(flagAttackInterval),
 			cmd.Duration(flagTimeout),
@@ -97,6 +98,7 @@ func runCameradar(ctx context.Context, cmd *cli.Command) error {
 		Targets:   targets,
 		Ports:     ports,
 		ScanSpeed: cmd.Int16(flagScanSpeed),
+		Scanner:   cmd.String(flagScanner),
 	}
 	var scanner cameradar.StreamScanner
 	scanner, err = scan.New(config, reporter)
@@ -141,6 +143,7 @@ func buildStartupOptions(
 	routesPath string,
 	credsPath string,
 	outputPath string,
+	scanner string,
 	scanSpeed int16,
 	attackInterval time.Duration,
 	timeout time.Duration,
@@ -153,6 +156,7 @@ func buildStartupOptions(
 		"ports: " + strings.Join(ports, ", "),
 		"custom-routes: " + fallbackValue(routesPath, "builtin"),
 		"custom-credentials: " + fallbackValue(credsPath, "builtin"),
+		"scanner: " + fallbackValue(scanner, "nmap"),
 		"scan-speed: " + strconv.FormatInt(int64(scanSpeed), 10),
 		"skip-scan: " + strconv.FormatBool(skipScan),
 		"attack-interval: " + attackInterval.String(),

cmd/cameradar/main.go

@@ -20,6 +20,7 @@ const (
 	flagPorts             = "ports"
 	flagCustomRoutes      = "custom-routes"
 	flagCustomCredentials = "custom-credentials"
+	flagScanner           = "scanner"
 	flagScanSpeed         = "scan-speed"
 	flagAttackInterval    = "attack-interval"
 	flagTimeout           = "timeout"
@@ -62,6 +63,12 @@ var flags = cmd.Flags{
 		Aliases: []string{"c"},
 		Sources: cli.EnvVars(strcase.ToSNAKE(flagCustomCredentials)),
 	},
+	&cli.StringFlag{
+		Name:    flagScanner,
+		Usage:   "Discovery scanner backend: nmap or masscan",
+		Sources: cli.EnvVars(strcase.ToSNAKE(flagScanner)),
+		Value:   "nmap",
+	},
 	&cli.Int16Flag{
 		Name:    flagScanSpeed,
 		Usage:   "The nmap speed preset to use for scanning (lower is stealthier)",