/// <summary>
/// Handles RIPv1 updates
/// </summary>
/// <param name="udpFrame"></param>
/// <param name="ipFrame"></param>
/// <returns>Bool indicating if something changed</returns>
private bool HandleRIPV1(UDP.UDPFrame udpFrame, IP.IPFrame ipFrame)
{
RIPFrame fRIPFrame;
bool bChanged = false;
if (ipFrame.SourceAddress.Equals(IPAddress.Broadcast)) // Check Addr
{
if (udpFrame.DestinationPort == iRIPPort) // Check Port
{
fRIPFrame = new RIPFrame(udpFrame.EncapsulatedFrame.FrameBytes);
if (fRIPFrame.Version == 1)
{
foreach (RIPUpdate ru in fRIPFrame.GetUpdates())
{
if (ru.AddressFamilyIdentifier == RIPEntryAddressFamily.IPv4)
{
bChanged |= UpdateEntry(ipFrame.SourceAddress, ru.Address, IPAddressAnalysis.GetClassfullSubnetMask(ru.Address), (int)ru.Metric);
}
}
}
}
}
return(bChanged);
}
/// <summary>
/// Handles RIPv2 Frames
/// </summary>
/// <param name="udpFrame"></param>
/// <param name="ipFrame"></param>
/// <returns>Bool indicating if something changed</returns>
private bool HandleRIPV2(UDP.UDPFrame udpFrame, IP.IPFrame ipFrame)
{
RIPFrame fRIPFrame;
bool bChanged = false;
if (ipFrame.SourceAddress.Equals(IPAddress.Broadcast))
{
HandleRIPV1(udpFrame, ipFrame); // RIPv1? Fallback!
}
else if (ipFrame.DestinationAddress.Equals(ipaRIPv2Address)) // Check Addr
{
if (udpFrame.DestinationPort == iRIPPort) //Check Port
{
fRIPFrame = new RIPFrame(udpFrame.EncapsulatedFrame.FrameBytes);
if (fRIPFrame.Version == 2)
{
foreach (RIPUpdate ru in fRIPFrame.GetUpdates())
{
if (ru.AddressFamilyIdentifier == RIPEntryAddressFamily.IPv4)
{
if (!IsHoldDown(ru.Address))
{
bChanged |= UpdateEntry(ipFrame.SourceAddress, ru.Address, ru.Ripv2SubnetMask, (int)ru.Metric);
}
}
}
}
else
{
bChanged |= HandleRIPV1(udpFrame, ipFrame);
}
}
}
return(bChanged);
}
