From 3d5ca9050e009533dd63f893131a8b4f955f72f4 Mon Sep 17 00:00:00 2001
From: Ariadne Conill <ariadne@dereferenced.org>
Date: Tue, 4 Aug 2020 11:46:10 -0600
Subject: [PATCH] interface: add lif_interface_collection_inherit() (ref #2)

---
 libifupdown/interface.c | 30 ++++++++++++++++++++++++++++++
 libifupdown/interface.h |  1 +
 2 files changed, 31 insertions(+)

diff --git a/libifupdown/interface.c b/libifupdown/interface.c
index 87f6c97..8eab120 100644
--- a/libifupdown/interface.c
+++ b/libifupdown/interface.c
@@ -214,3 +214,33 @@ lif_interface_collection_delete(struct lif_dict *collection, struct lif_interfac
 
 	lif_dict_delete_entry(collection, entry);
 }
+
+bool
+lif_interface_collection_inherit(struct lif_interface *interface, struct lif_dict *collection, const char *ifname)
+{
+	struct lif_interface *parent = lif_interface_collection_find(collection, ifname);
+
+	if (parent == NULL)
+		return false;
+
+	/* copy the variables */
+	struct lif_node *iter;
+	LIF_DICT_FOREACH(iter, &parent->vars)
+	{
+		struct lif_dict_entry *entry = iter->data;
+
+		if (!strcmp(entry->key, "address"))
+		{
+			struct lif_address *addr = calloc(1, sizeof *addr);
+			struct lif_address *other_addr = entry->data;
+
+			memcpy(addr, other_addr, sizeof *addr);
+
+			lif_dict_add(&interface->vars, entry->key, addr);
+		}
+		else
+			lif_dict_add(&interface->vars, entry->key, strdup(entry->data));
+	}
+
+	return true;
+}
diff --git a/libifupdown/interface.h b/libifupdown/interface.h
index 9ef9387..045f848 100644
--- a/libifupdown/interface.h
+++ b/libifupdown/interface.h
@@ -73,6 +73,7 @@ extern void lif_interface_collection_init(struct lif_dict *collection);
 extern void lif_interface_collection_fini(struct lif_dict *collection);
 extern struct lif_interface *lif_interface_collection_find(struct lif_dict *collection, const char *ifname);
 extern struct lif_interface *lif_interface_collection_upsert(struct lif_dict *collection, struct lif_interface *interface);
+extern bool lif_interface_collection_inherit(struct lif_interface *interface, struct lif_dict *collection, const char *ifname);
 extern void lif_interface_collection_delete(struct lif_dict *collection, struct lif_interface *interface);
 
 #endif