Allow no-key, single-value JSON body

apache2/msc_json.c

@@ -27,8 +27,7 @@ int json_add_argument(modsec_rec *msr, const char *value, unsigned length)
      * to reference this argument; for now we simply ignore these
      */
     if (!msr->json->current_key) {
-        msr_log(msr, 3, "Cannot add scalar value without an associated key");
-        return 1;
+        msr->json->current_key = "";
     }
 
     arg = (msc_arg *) apr_pcalloc(msr->mp, sizeof(msc_arg));

apache2/msc_json.h

@@ -39,7 +39,7 @@ struct json_data {
 
     /* prefix is used to create data hierarchy (i.e., 'parent.child.value') */
     unsigned char *prefix;
-    unsigned char *current_key;
+    const unsigned char *current_key;
     long int current_depth;
     int depth_limit_exceeded;
 };