main: Error out when combining -i/--interactive and -f/--file

These two options are mutually exclusive, display error in that case:

 # nft -i -f test.nft
 Error: -i/--interactive and -f/--file options cannot be combined

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index 9bd25db8..cb20850b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -405,9 +405,19 @@ int main(int argc, char * const *argv)
 			nft_ctx_set_dry_run(nft, true);
 			break;
 		case OPT_FILE:
+			if (interactive) {
+				fprintf(stderr,
+					"Error: -i/--interactive and -f/--file options cannot be combined\n");
+				exit(EXIT_FAILURE);
+			}
 			filename = optarg;
 			break;
 		case OPT_INTERACTIVE:
+			if (filename) {
+				fprintf(stderr,
+					"Error: -i/--interactive and -f/--file options cannot be combined\n");
+				exit(EXIT_FAILURE);
+			}
 			interactive = true;
 			break;
 		case OPT_INCLUDEPATH: