diff --git a/lib/datastruct/str_list.c b/lib/datastruct/str_list.c
index b414b51e2..dc1e59c15 100644
--- a/lib/datastruct/str_list.c
+++ b/lib/datastruct/str_list.c
@@ -57,6 +57,25 @@ int str_list_del(struct list *sll, const char *str)
 	return 1;
 }
 
+int str_list_dup(struct pool *mem, struct list *sllnew, struct list *sllold)
+{
+	struct str_list *sl;
+
+	list_init(sllnew);
+
+	list_iterate_items(sl, sllold) {
+		if (!str_list_add(mem, sllnew, strdup(sl->str))) {
+			stack;
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+/*
+ * Is item on list?
+ */
 int str_list_match_item(struct list *sll, const char *str)
 {
 	struct str_list *sl;
@@ -68,6 +87,9 @@ int str_list_match_item(struct list *sll, const char *str)
 	return 0;
 }
 
+/*
+ * Is at least one item on both lists?
+ */
 int str_list_match_list(struct list *sll, struct list *sll2)
 {
 	struct str_list *sl;
@@ -78,3 +100,20 @@ int str_list_match_list(struct list *sll, struct list *sll2)
 
 	return 0;
 }
+
+/*
+ * Do both lists contain the same set of items?
+ */
+int str_list_lists_equal(struct list *sll, struct list *sll2)
+{
+	struct str_list *sl;
+
+	if (list_size(sll) != list_size(sll2))
+		return 0;
+
+	list_iterate_items(sl, sll)
+	    if (!str_list_match_item(sll2, sl->str))
+		return 0;
+
+	return 1;
+}
diff --git a/lib/datastruct/str_list.h b/lib/datastruct/str_list.h
index c4d03f868..a9180e20d 100644
--- a/lib/datastruct/str_list.h
+++ b/lib/datastruct/str_list.h
@@ -14,5 +14,7 @@ int str_list_add(struct pool *mem, struct list *sll, const char *str);
 int str_list_del(struct list *sll, const char *str);
 int str_list_match_item(struct list *sll, const char *str);
 int str_list_match_list(struct list *sll, struct list *sll2);
+int str_list_lists_equal(struct list *sll, struct list *sll2);
+int str_list_dup(struct pool *mem, struct list *sllnew, struct list *sllold);
 
 #endif