new(falco): enable -o key={object} configuration

Signed-off-by: Luca Guerra <[email protected]>

userspace/falco/configuration.cpp

@@ -84,8 +84,8 @@ falco_configuration::falco_configuration():
 	m_metrics_convert_memory_to_mb(true),
 	m_metrics_include_empty_values(false),
 	m_container_engines_mask(0),
-	m_container_engines_cri_socket_paths({"/run/containerd/containerd.sock", "/run/crio/crio.sock","/run/k3s/containerd/containerd.sock"}),
-	m_container_engines_disable_cri_async(false)
+	m_container_engines_disable_cri_async(false),
+	m_container_engines_cri_socket_paths({"/run/containerd/containerd.sock", "/run/crio/crio.sock","/run/k3s/containerd/containerd.sock"})
 {
 	m_config_schema = nlohmann::json::parse(schema_json_string);
 }
@@ -749,5 +749,12 @@ void falco_configuration::set_cmdline_option(const std::string &opt)
 		throw std::logic_error("Error parsing config option \"" + opt + "\". Must be of the form key=val or key.subkey=val");
 	}
 
-	m_config.set_scalar(keyval.first, keyval.second);
+	if (keyval.second.find_first_of('{', 0) == 0 && keyval.second.find_first_of('}', keyval.second.size() - 1))
+	{
+		YAML::Node node = YAML::Load(keyval.second);
+		m_config.set_object(keyval.first, node);
+	} else
+	{
+		m_config.set_scalar(keyval.first, keyval.second);
+	}
 }

userspace/falco/yaml_helper.h

@@ -177,6 +177,16 @@ class yaml_helper
 		node = value;
 	}
 
+	/**
+	 * Set the node identified by key to an object value
+	 */
+	void set_object(const std::string& key, const YAML::Node& value)
+	{
+		YAML::Node node;
+		get_node(node, key, true);
+		node = value;
+	}
+
 	/**
 	* Get the sequence value from the node identified by key.
 	*/
@@ -482,5 +492,6 @@ namespace YAML {
 
 			return true;
 		}
+		// The "encode" function is not needed here, in fact you can simply YAML::load any json string.
 	};
 }