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00001 //
00002 // Copyright (C) 2006 Andras Babos and Andras Varga
00003 //
00004 // This program is free software; you can redistribute it and/or
00005 // modify it under the terms of the GNU Lesser General Public License
00006 // as published by the Free Software Foundation; either version 2
00007 // of the License, or (at your option) any later version.
00008 //
00009 // This program is distributed in the hope that it will be useful,
00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 // GNU Lesser General Public License for more details.
00013 //
00014 // You should have received a copy of the GNU Lesser General Public License
00015 // along with this program; if not, see <http://www.gnu.org/licenses/>.
00016 //
00017 
00018 #include "OSPFInterfaceStateDown.h"
00019 #include "MessageHandler.h"
00020 #include "OSPFArea.h"
00021 #include "OSPFRouter.h"
00022 #include "OSPFInterfaceStatePointToPoint.h"
00023 #include "OSPFInterfaceStateNotDesignatedRouter.h"
00024 #include "OSPFInterfaceStateWaiting.h"
00025 #include "OSPFInterfaceStateLoopback.h"
00026 
00027 void OSPF::InterfaceStateDown::ProcessEvent(OSPF::Interface* intf, OSPF::Interface::InterfaceEventType event)
00028 {
00029     if (event == OSPF::Interface::InterfaceUp) {
00030         OSPF::MessageHandler* messageHandler = intf->GetArea()->GetRouter()->GetMessageHandler();
00031         messageHandler->StartTimer(intf->GetHelloTimer(), truncnormal(0.1, 0.01)); // add some deviation to avoid startup collisions
00032         messageHandler->StartTimer(intf->GetAcknowledgementTimer(), intf->GetAcknowledgementDelay());
00033         switch (intf->GetType()) {
00034             case OSPF::Interface::PointToPoint:
00035             case OSPF::Interface::PointToMultiPoint:
00036             case OSPF::Interface::Virtual:
00037                 ChangeState(intf, new OSPF::InterfaceStatePointToPoint, this);
00038                 break;
00039 
00040             case OSPF::Interface::NBMA:
00041                 if (intf->GetRouterPriority() == 0) {
00042                     ChangeState(intf, new OSPF::InterfaceStateNotDesignatedRouter, this);
00043                 } else {
00044                     ChangeState(intf, new OSPF::InterfaceStateWaiting, this);
00045                     messageHandler->StartTimer(intf->GetWaitTimer(), intf->GetRouterDeadInterval());
00046 
00047                     long neighborCount = intf->GetNeighborCount();
00048                     for (long i = 0; i < neighborCount; i++) {
00049                         OSPF::Neighbor* neighbor = intf->GetNeighbor(i);
00050                         if (neighbor->GetPriority() > 0) {
00051                             neighbor->ProcessEvent(OSPF::Neighbor::Start);
00052                         }
00053                     }
00054                 }
00055                 break;
00056 
00057             case OSPF::Interface::Broadcast:
00058                 if (intf->GetRouterPriority() == 0) {
00059                     ChangeState(intf, new OSPF::InterfaceStateNotDesignatedRouter, this);
00060                 } else {
00061                     ChangeState(intf, new OSPF::InterfaceStateWaiting, this);
00062                     messageHandler->StartTimer(intf->GetWaitTimer(), intf->GetRouterDeadInterval());
00063                 }
00064                 break;
00065 
00066             default:
00067                 break;
00068         }
00069     }
00070     if (event == OSPF::Interface::LoopIndication) {
00071         intf->Reset();
00072         ChangeState(intf, new OSPF::InterfaceStateLoopback, this);
00073     }
00074 }
00075