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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 "LSA.h"
00019 
00020 bool OSPF::ASExternalLSA::Update(const OSPFASExternalLSA* lsa)
00021 {
00022     bool different = DiffersFrom(lsa);
00023     (*this) = (*lsa);
00024     ResetInstallTime();
00025     if (different) {
00026         ClearNextHops();
00027         return true;
00028     } else {
00029         return false;
00030     }
00031 }
00032 
00033 bool OSPF::ASExternalLSA::DiffersFrom(const OSPFASExternalLSA* asExternalLSA) const
00034 {
00035     const OSPFLSAHeader& lsaHeader = asExternalLSA->getHeader();
00036     bool differentHeader = ((header_var.getLsOptions() != lsaHeader.getLsOptions()) ||
00037                             ((header_var.getLsAge() == MAX_AGE) && (lsaHeader.getLsAge() != MAX_AGE)) ||
00038                             ((header_var.getLsAge() != MAX_AGE) && (lsaHeader.getLsAge() == MAX_AGE)) ||
00039                             (header_var.getLsaLength() != lsaHeader.getLsaLength()));
00040     bool differentBody   = false;
00041 
00042     if (!differentHeader) {
00043         const OSPFASExternalLSAContents& lsaContents  = asExternalLSA->getContents();
00044         unsigned int                     tosInfoCount = contents_var.getExternalTOSInfoArraySize();
00045 
00046         differentBody = ((contents_var.getNetworkMask() != lsaContents.getNetworkMask()) ||
00047                          (contents_var.getE_ExternalMetricType() != lsaContents.getE_ExternalMetricType()) ||
00048                          (contents_var.getRouteCost() != lsaContents.getRouteCost()) ||
00049                          (contents_var.getForwardingAddress() != lsaContents.getForwardingAddress()) ||
00050                          (contents_var.getExternalRouteTag() != lsaContents.getExternalRouteTag()) ||
00051                          (tosInfoCount != lsaContents.getExternalTOSInfoArraySize()));
00052 
00053         if (!differentBody) {
00054             for (unsigned int i = 0; i < tosInfoCount; i++) {
00055                 const ExternalTOSInfo& currentTOSInfo = contents_var.getExternalTOSInfo(i);
00056                 const ExternalTOSInfo& lsaTOSInfo     = lsaContents.getExternalTOSInfo(i);
00057 
00058                 if ((currentTOSInfo.tosData.tos != lsaTOSInfo.tosData.tos) ||
00059                     (currentTOSInfo.tosData.tosMetric[0] != lsaTOSInfo.tosData.tosMetric[0]) ||
00060                     (currentTOSInfo.tosData.tosMetric[1] != lsaTOSInfo.tosData.tosMetric[1]) ||
00061                     (currentTOSInfo.tosData.tosMetric[2] != lsaTOSInfo.tosData.tosMetric[2]) ||
00062                     (currentTOSInfo.E_ExternalMetricType != lsaTOSInfo.E_ExternalMetricType) ||
00063                     (currentTOSInfo.forwardingAddress != lsaTOSInfo.forwardingAddress) ||
00064                     (currentTOSInfo.externalRouteTag != lsaTOSInfo.externalRouteTag))
00065                 {
00066                     differentBody = true;
00067                     break;
00068                 }
00069             }
00070         }
00071     }
00072 
00073     return (differentHeader || differentBody);
00074 }