node: check for validity of node name

include/villas/node.h

@@ -201,6 +201,8 @@ struct node_type * node_type(struct node *n);
 
 struct memory_type * node_memory_type(struct node *n, struct memory_type *parent);
 
+int node_is_valid_name(const char *name);
+
 #ifdef __cplusplus
 }
 #endif

lib/node.c

@@ -21,6 +21,7 @@
  *********************************************************************************/
 
 #include <string.h>
+#include <ctype.h>
 
 #include <villas/node/config.h>
 #include <villas/hook.h>
@@ -766,3 +767,15 @@ invalid2:
 
 	return 0;
 }
+
+int node_is_valid_name(const char *name)
+{
+	for (const char *p = name; *p; p++) {
+		if (isalnum(*p) || (*p == '_') || (*p == '-'))
+			continue;
+
+		return -1;
+	}
+
+	return 0;
+}

lib/super_node.cpp

@@ -217,6 +217,10 @@ int SuperNode::parseJson(json_t *j)
 			struct node_type *nt;
 			const char *type;
 
+			ret = node_is_valid_name(name);
+			if (ret)
+				throw RuntimeError("Invalid name for node: {}", name);
+
 			ret = json_unpack_ex(json_node, &err, 0, "{ s: s }", "type", &type);
 			if (ret)
 				throw JsonError(err, "Failed to parse node");