main: Bail if non-available JSON was requested

If user passes '-j' flag, falling back to standard syntax output
probably causes more harm than good so instead print an error message
and exit(1).

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

1 files changed, 3 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index 9a50f30f..cbfd69a4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -277,6 +277,9 @@ int main(int argc, char * const *argv)
 		case OPT_JSON:
 #ifdef HAVE_LIBJANSSON
 			output_flags |= NFT_CTX_OUTPUT_JSON;
+#else
+			fprintf(stderr, "JSON support not compiled-in\n");
+			exit(EXIT_FAILURE);
 #endif
 			break;
 		case OPT_GUID: