Re: [PATCH nft v4] src: enable json echo output when reading native syntax

[Pablo Neira Ayuso <pablo@netfilter.org>]

On Tue, Aug 04, 2020 at 02:13:01PM +0200, Jose M. Guisado wrote:
> Hi Pablo, sorry about the formatting issues.
> 
> One thing about your suggestion:
> 
> On 4/8/20 13:05, Pablo Neira Ayuso wrote:
> > if (!ctx->json_root)
> >                  return;
> 
> Checking uniquely for the absence of json_root is not enough as
> json_echo may have been initialized. In essence, the case the
> patch is fixing is when json_root is null but json_echo is not,
> to denote that we want json echo output but have not read json
> from input.

Ah, indeed, sorry. Then, probably:

        if (!ctx->json_root) {
               if (!ctx->json_echo)
                        return;

                ctx->json_echo = json_pack("{s:o}", "nftables", ctx->json_echo);
                json_dumpf(ctx->json_echo, ctx->output.output_fp, JSON_PRESERVE_ORDER);
                json_decref(ctx->json_echo);
                ctx->json_echo = NULL;
                fprintf(ctx->output.output_fp, "\n");
                fflush(ctx->output.output_fp);
        } else {
                json_dumpf(ctx->json_root, ctx->output.output_fp, JSON_PRESERVE_ORDER);
                json_cmd_assoc_free();
                json_decref(ctx->json_root);
                ctx->json_root = NULL;
        }