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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 "OSPFNeighborStateExchange.h"
00019 #include "OSPFNeighborStateDown.h"
00020 #include "OSPFNeighborStateInit.h"
00021 #include "OSPFNeighborStateTwoWay.h"
00022 #include "OSPFNeighborStateExchangeStart.h"
00023 #include "OSPFNeighborStateFull.h"
00024 #include "OSPFNeighborStateLoading.h"
00025 #include "MessageHandler.h"
00026 #include "OSPFInterface.h"
00027 #include "OSPFArea.h"
00028 #include "OSPFRouter.h"
00029 
00030 void OSPF::NeighborStateExchange::ProcessEvent(OSPF::Neighbor* neighbor, OSPF::Neighbor::NeighborEventType event)
00031 {
00032     if ((event == OSPF::Neighbor::KillNeighbor) || (event == OSPF::Neighbor::LinkDown)) {
00033         MessageHandler* messageHandler = neighbor->GetInterface()->GetArea()->GetRouter()->GetMessageHandler();
00034         neighbor->Reset();
00035         messageHandler->ClearTimer(neighbor->GetInactivityTimer());
00036         ChangeState(neighbor, new OSPF::NeighborStateDown, this);
00037     }
00038     if (event == OSPF::Neighbor::InactivityTimer) {
00039         neighbor->Reset();
00040         if (neighbor->GetInterface()->GetType() == OSPF::Interface::NBMA) {
00041             MessageHandler* messageHandler = neighbor->GetInterface()->GetArea()->GetRouter()->GetMessageHandler();
00042             messageHandler->StartTimer(neighbor->GetPollTimer(), neighbor->GetInterface()->GetPollInterval());
00043         }
00044         ChangeState(neighbor, new OSPF::NeighborStateDown, this);
00045     }
00046     if (event == OSPF::Neighbor::OneWayReceived) {
00047         neighbor->Reset();
00048         ChangeState(neighbor, new OSPF::NeighborStateInit, this);
00049     }
00050     if (event == OSPF::Neighbor::HelloReceived) {
00051         MessageHandler* messageHandler = neighbor->GetInterface()->GetArea()->GetRouter()->GetMessageHandler();
00052         messageHandler->ClearTimer(neighbor->GetInactivityTimer());
00053         messageHandler->StartTimer(neighbor->GetInactivityTimer(), neighbor->GetRouterDeadInterval());
00054     }
00055     if (event == OSPF::Neighbor::IsAdjacencyOK) {
00056         if (!neighbor->NeedAdjacency()) {
00057             neighbor->Reset();
00058             ChangeState(neighbor, new OSPF::NeighborStateTwoWay, this);
00059         }
00060     }
00061     if ((event == OSPF::Neighbor::SequenceNumberMismatch) || (event == OSPF::Neighbor::BadLinkStateRequest)) {
00062         MessageHandler* messageHandler = neighbor->GetInterface()->GetArea()->GetRouter()->GetMessageHandler();
00063         neighbor->Reset();
00064         neighbor->IncrementDDSequenceNumber();
00065         neighbor->SendDatabaseDescriptionPacket(true);
00066         messageHandler->StartTimer(neighbor->GetDDRetransmissionTimer(), neighbor->GetInterface()->GetRetransmissionInterval());
00067         ChangeState(neighbor, new OSPF::NeighborStateExchangeStart, this);
00068     }
00069     if (event == OSPF::Neighbor::ExchangeDone) {
00070         if (neighbor->IsLinkStateRequestListEmpty()) {
00071             MessageHandler* messageHandler = neighbor->GetInterface()->GetArea()->GetRouter()->GetMessageHandler();
00072             messageHandler->StartTimer(neighbor->GetDDRetransmissionTimer(), neighbor->GetRouterDeadInterval());
00073             neighbor->ClearRequestRetransmissionTimer();
00074             ChangeState(neighbor, new OSPF::NeighborStateFull, this);
00075         } else {
00076             MessageHandler* messageHandler = neighbor->GetInterface()->GetArea()->GetRouter()->GetMessageHandler();
00077             messageHandler->StartTimer(neighbor->GetDDRetransmissionTimer(), neighbor->GetRouterDeadInterval());
00078             ChangeState(neighbor, new OSPF::NeighborStateLoading, this);
00079         }
00080     }
00081     if (event == OSPF::Neighbor::UpdateRetransmissionTimer) {
00082         neighbor->RetransmitUpdatePacket();
00083         neighbor->StartUpdateRetransmissionTimer();
00084     }
00085     if (event == OSPF::Neighbor::RequestRetransmissionTimer) {
00086         neighbor->SendLinkStateRequestPacket();
00087         neighbor->StartRequestRetransmissionTimer();
00088     }
00089 }