libnftables: Implement JSON output support

Although technically there already is support for JSON output via 'nft
export json' command, it is hardly useable since it exports all the gory
details of nftables VM. Also, libnftables has no control over what is
exported since the content comes directly from libnftnl.

Instead, implement JSON format support for regular 'nft list' commands.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/rule.c b/src/rule.c
index a3ed5179..3e8dea40 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -21,6 +21,7 @@
 #include <utils.h>
 #include <netdb.h>
 #include <netlink.h>
+#include <json.h>
 
 #include <libnftnl/common.h>
 #include <libnftnl/ruleset.h>
@@ -1819,6 +1820,9 @@ static int do_command_list(struct netlink_ctx *ctx, struct cmd *cmd)
 {
 	struct table *table = NULL;
 
+	if (ctx->octx->json)
+		return do_command_list_json(ctx, cmd);
+
 	if (cmd->handle.table.name != NULL)
 		table = table_lookup(&cmd->handle, ctx->cache);