/// <summary>
/// Creates a new instance of this class
/// </summary>
public OSPFDatabaseDescriptionMessage()
{
sInterfaceMTU = 0;
ospfOptions = new OSPFOptionsField();
iDDSequenceNumber = 0;
lLSAHeaders = new List <LSAHeader>();
}
/// <summary>
/// Creates a new instance of this class
/// </summary>
public LSAHeader()
{
iLSAge = 0;
ospfOptions = new OSPFOptionsField();
lsType = LSType.Unknown;
iLinkStateID = 0;
iAdvertisingRouter = 0;
iLSSequenceNumber = 0;
iOrigalLength = -1;
bOriginalChecksum = new byte[0];
}
/// <summary>
/// Creates a new instance of this class
/// </summary>
public OSPFHelloMessage()
{
nNetmask = new Subnetmask();
iHelloInterval = 0;
bPriority = 0;
iDeadInterval = 30;
ipaDesignatedRouter = IPAddress.Any;
ipaBackupDesignatedRouter = IPAddress.Any;
lipaNeighbours = new List <IPAddress>();
ospfOptions = new OSPFOptionsField();
}
/// <summary>
/// Creates a new instance of this class by parsing the given data
/// </summary>
/// <param name="bData">The data to pase</param>
public OSPFHelloMessage(byte[] bData)
{
byte[] bTmpBytes = new byte[4];
for (int iC1 = 0; iC1 < 4; iC1++)
{
bTmpBytes[iC1] = bData[iC1];
}
nNetmask = new Subnetmask(bTmpBytes);
iHelloInterval = (bData[5] << 8) + bData[6];
ospfOptions = new OSPFOptionsField(bData[6]);
bPriority = bData[7];
iDeadInterval = ((int)bData[8] << 24) + ((int)bData[9] << 16) + ((int)bData[10] << 8) + bData[11];
for (int iC1 = 12; iC1 < 16; iC1++)
{
bTmpBytes[iC1 - 12] = bData[iC1];
}
ipaDesignatedRouter = new IPAddress(bTmpBytes);
for (int iC1 = 16; iC1 < 20; iC1++)
{
bTmpBytes[iC1 - 16] = bData[iC1];
}
ipaBackupDesignatedRouter = new IPAddress(bTmpBytes);
lipaNeighbours = new List <IPAddress>();
for (int iC2 = 20; iC2 < bData.Length; iC2 += 4)
{
for (int iC1 = iC2; iC1 < iC2 + 4; iC1++)
{
bTmpBytes[iC1 - iC2] = bData[iC1];
}
lipaNeighbours.Add(new IPAddress(bTmpBytes));
}
}
/// <summary>
/// Creates a new instance of this class by parsing the given data
/// </summary>
/// <param name="bData">The data to parse</param>
public OSPFDatabaseDescriptionMessage(byte[] bData)
{
sInterfaceMTU = (short)(((int)bData[0] << 8) + bData[1]);
ospfOptions = new OSPFOptionsField(bData[2]);
bMSBit = (bData[3] & 0x1) != 0;
bMBit = (bData[3] & 0x2) != 0;
bIBit = (bData[3] & 0x4) != 0;
bOOBResyncBit = (bData[3] & 0x8) != 0;
iDDSequenceNumber = ((uint)bData[4] << 24) + ((uint)bData[5] << 16) + ((uint)bData[6] << 8) + bData[7];
lLSAHeaders = new List <LSAHeader>();
byte[] bLSAHeader = new byte[20];
for (int iC1 = 8; iC1 < bData.Length; iC1 += 20)
{
for (int iC2 = 0; iC2 < 20; iC2++)
{
bLSAHeader[iC2] = bData[iC2 + iC1];
}
lLSAHeaders.Add(new LSAHeader(bLSAHeader, false));
}
}
/// <summary>
/// Creates a new instance of this class by parsing the given data.
/// </summary>
/// <param name="bData">The data to parse</param>
/// <param name="bCreateBody">A bool indicating whether a LSA body should be created. Set this property to false for database descriptions and LS acknowledgements messages</param>
public LSAHeader(byte[] bData, bool bCreateBody)
{
iLSAge = (short)((bData[0] << 8) + bData[1]);
ospfOptions = new OSPFOptionsField(bData[2]);
lsType = (LSType)bData[3];
iLinkStateID = ((uint)bData[4] << 24) + ((uint)bData[5] << 16) + ((uint)bData[6] << 8) + bData[7];
iAdvertisingRouter = ((uint)bData[8] << 24) + ((uint)bData[9] << 16) + ((uint)bData[10] << 8) + bData[11];
iLSSequenceNumber = ((uint)bData[12] << 24) + ((uint)bData[13] << 16) + ((uint)bData[14] << 8) + bData[15];
// 2 byte checksum
int iLen = ((bData[18] << 8) + bData[19]) - 20;
if (bCreateBody)
{
iOrigalLength = -1;
bOriginalChecksum = new byte[0];
byte[] bBodyBytes = new byte[iLen];
for (int iC1 = 0; iC1 < iLen; iC1++)
{
bBodyBytes[iC1] = bData[iC1 + 20];
}
if (bBodyBytes.Length > 0)
{
if (lsType == LSType.Router)
{
fEncapsulatedFrame = new RouterLSA(bBodyBytes);
}
else if (lsType == LSType.External)
{
fEncapsulatedFrame = new ASExternalLSA(bBodyBytes);
}
else if (lsType == LSType.Network)
{
fEncapsulatedFrame = new NetworkLSA(bBodyBytes);
}
else if (lsType == LSType.Summary_IP)
{
fEncapsulatedFrame = new SummaryLSA(bBodyBytes);
}
else if (lsType == LSType.Summary_ASBR)
{
fEncapsulatedFrame = new SummaryLSA(bBodyBytes);
}
else if (lsType == LSType.NSSA)
{
fEncapsulatedFrame = new ASExternalLSA(bBodyBytes);
}
else
{
fEncapsulatedFrame = new RawDataFrame(bBodyBytes);
}
}
}
else
{
iOrigalLength = iLen + 20;
bOriginalChecksum = new byte[2];
bOriginalChecksum[0] = bData[16];
bOriginalChecksum[1] = bData[17];
}
}
