config: Add a validation function for service parameters

Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>

Author: cosmo0920

include/fluent-bit/flb_config.h

@@ -369,6 +369,7 @@ struct flb_config {
 struct flb_config *flb_config_init();
 void flb_config_exit(struct flb_config *config);
 const char *flb_config_prop_get(const char *key, struct mk_list *list);
+int flb_config_service_property_is_valid(const char *k);
 int flb_config_set_property(struct flb_config *config,
                             const char *k, const char *v);
 int flb_config_set_program_name(struct flb_config *config, char *name);

src/flb_config.c

@@ -830,6 +830,26 @@ int set_log_level_from_env(struct flb_config *config)
     return -1;
 }
 
+int flb_config_service_property_is_valid(const char *k)
+{
+    int i = 0;
+    size_t len;
+    char *key;
+
+    len = strnlen(k, 256);
+    key = service_configs[0].key;
+
+    while (key != NULL) {
+        if (prop_key_check(key, k, len) == 0) {
+            return FLB_TRUE;
+        }
+
+        key = service_configs[++i].key;
+    }
+
+    return FLB_FALSE;
+}
+
 int flb_config_set_property(struct flb_config *config,
                             const char *k, const char *v)
 {
@@ -918,6 +938,8 @@ int flb_config_set_property(struct flb_config *config,
         }
         key = service_configs[++i].key;
     }
+
+    flb_warn("[config] unknown service property '%s', it has been ignored", k);
     return 0;
 }
 
@@ -1536,6 +1558,12 @@ int flb_config_load_config_format(struct flb_config *config, struct flb_cf *cf)
                 /* Yaml allow parsers definitions in any Yaml file, all good */
             }
         }
+
+        if (s->type == FLB_CF_OTHER &&
+            strcasecmp(s->name, "processor") != 0) {
+            flb_warn("[config] unknown configuration section '%s', it has been ignored",
+                     s->name);
+        }
     }
 
     /* Read main 'service' section */