json: allow to specify comment on table

Allow users to add a comment when declaring a table:

 # sudo nft add table inet test3 '{comment "this is a comment";}'
 # nft list ruleset
 table inet test3 {
        comment "this is a comment"
 }
 # nft -j list ruleset
 {"nftables": [{"metainfo": {"version": "1.0.7", "release_name": "Old Doc Yak", "json_schema_version": 1}}, {"table": {"family": "inet", "name": "test3", "handle": 3, "comment": "this is a comment"}}]}
 # nft -j list ruleset > test.json
 # nft flush ruleset
 # nft -j -f test.json
 # nft -j list ruleset
 {"nftables": [{"metainfo": {"version": "1.0.7", "release_name": "Old Doc Yak", "json_schema_version": 1}}, {"table": {"family": "inet", "name": "test3", "handle": 4, "comment": "this is a comment"}}]}

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1670
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/json.c b/src/json.c
index f15461d3..ae00055d 100644
--- a/src/json.c
+++ b/src/json.c
@@ -510,6 +510,9 @@ static json_t *table_print_json(const struct table *table)
 	if (tmp)
 		json_object_set_new(root, "flags", tmp);
 
+	if (table->comment)
+		json_object_set_new(root, "comment", json_string(table->comment));
+
 	return json_pack("{s:o}", "table", root);
 }