| Begin: |
| Declare flag called AntiDDoSEnabled |
| Declare flag called AntiDDoSForced |
| Declare an integer called AntiDDoSPeriod |
| Declare an integer called AntiDDoSHDDoS |
| Declare an integer called AntiDDoSFlashCrowd |
| Declare an integer called AntiDDoSLDDoS |
| Declare an integer called AntiDDoSNormal |
| Declare string called AntiDDoSCommand |
| Declare string called WhiteList |
| WHILE uri <> NULL |
| IF main_request <> NULL OR prev_request <> NULL |
| return DECLINED |
| ENDIF |
| IF AntiDDoSEnabled = ANTIDDOS_DISABLED |
| return DECLINED |
| ENDIF |
| IF AntiDDoSForced = ANTIDDOS_DISABLED |
| return DECLINED |
| ENDIF |
| IF handler = modantiddos-handler |
| return antiddos_viewer |
| ENDIF |
| IF is_WhiteListed(remote_ip) |
| return OK |
| ENDIF |
| IF is_BlackListed(remote_ip) |
| return HTTP_FORBIDDEN |
| EdgeRouter_Ban(remote_ip) |
| ENDIF |
| set entropy_result = OK |
| IF AntiDDoSForced = ANTIDDOS_DISABLED |
| t = time_now − AntiDDoSPeriod |
| IF (uri_time < t) |
| Calculate entropyUri (uri) |
| ENDIF |
| IF entropyUri = AntiDDoSHDDoS |
| return HTTP_FORBIDDEN |
| Blacklist_Table(remote_ip) |
| EdgeRouter_Ban(remote_ip) |
| ENDIF |
| IF entropyUri = AntiDDoSFlashCrowd |
| decrease timeout |
| decrease MaxKeepAliveRequests |
| IF (timeout == 0 && KeepAlive == Off) |
| return HTTP_FORBIDDEN |
| Blacklist_Table(remote_ip) |
| EdgeRouter_Ban(remote_ip) |
| ENDIF |
| ENDIF |
| ENDIF |
| ENDIF |
| return entropy_result |
| ENDWHILE |
| End. |
