src: add comment support for set declarations

Allow users to add a comment when declaring a named set.

Adds set output handling the comment in both nftables and json
format.

$ nft add table ip x
$ nft add set ip x s {type ipv4_addr\; comment "some_addrs"\; elements = {1.1.1.1, 1.2.3.4}}

$ nft list ruleset
table ip x {
	set s {
		type ipv4_addr;
		comment "some_addrs"
		elements = { 1.1.1.1, 1.2.3.4 }
	}
}

$ nft --json list ruleset
{
    "nftables": [
        {
            "metainfo": {
                "json_schema_version": 1,
                "release_name": "Capital Idea #2",
                "version": "0.9.6"
            }
        },
        {
            "table": {
                "family": "ip",
                "handle": 4857,
                "name": "x"
            }
        },
        {
            "set": {
                "comment": "some_addrs",
                "elem": [
                    "1.1.1.1",
                    "1.2.3.4"
                ],
                "family": "ip",
                "handle": 1,
                "name": "s",
                "table": "x",
                "type": "ipv4_addr"
            }
        }
    ]
}

Signed-off-by: Jose M. Guisado Gomez <guigom@riseup.net>
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 888cb371..a9f5000f 100644
--- a/src/json.c
+++ b/src/json.c
@@ -98,6 +98,9 @@ static json_t *set_print_json(struct output_ctx *octx, const struct set *set)
 			"table", set->handle.table.name,
 			"type", set_dtype_json(set->key),
 			"handle", set->handle.handle.id);
+
+	if (set->comment)
+		json_object_set_new(root, "comment", json_string(set->comment));
 	if (datatype_ext)
 		json_object_set_new(root, "map", json_string(datatype_ext));