src: use expression to store the log prefix

Intsead of using an array of char.

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

1 files changed, 6 insertions, 3 deletions

diff --git a/src/json.c b/src/json.c
index ed713181..24583060 100644
--- a/src/json.c
+++ b/src/json.c
@@ -1224,9 +1224,12 @@ json_t *log_stmt_json(const struct stmt *stmt, struct output_ctx *octx)
 {
 	json_t *root = json_object(), *flags;
 
-	if (stmt->log.flags & STMT_LOG_PREFIX)
-		json_object_set_new(root, "prefix",
-				    json_string(stmt->log.prefix));
+	if (stmt->log.flags & STMT_LOG_PREFIX) {
+		char prefix[NF_LOG_PREFIXLEN] = {};
+
+		expr_to_string(stmt->log.prefix, prefix);
+		json_object_set_new(root, "prefix", json_string(prefix));
+	}
 	if (stmt->log.flags & STMT_LOG_GROUP)
 		json_object_set_new(root, "group",
 				    json_integer(stmt->log.group));