/// <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);
}
/// <summary>
/// Forces this instance to distribute traffic immidiately, with exluding the specified interface from forwarding operations.
/// </summary>
/// <param name="ipiExcludeInterface">The interface to exclude from forwarding operations or null, if no interface should be excluded.</param>
public void DistributeUpdate(IPInterface ipiExcludeInterface)
{
IRouter rtRouter = this.RouterToManage;
if (rtRouter != null)
{
RIPFrame rf = new RIPFrame();
rf.Version = (uint)this.iVersion;
rf.Command = RipCommand.RIPResponse;
RoutingEntry[] arre = rtRouter.RoutingTable.GetRoutes();
foreach (RoutingEntry re in arre)
{
if (re.Owner == RoutingEntryOwner.RIP || re.Owner == RoutingEntryOwner.Interface)
{
if (this.iVersion == 1)
{
rf.AddUpdate(new RIPUpdate(RIPEntryAddressFamily.IPv4, new byte[2], new Subnetmask(), IPAddress.Any, re.Destination, (uint)((re.Metric + 1) > 16 ? 16 : (re.Metric + 1))));
}
else if (this.iVersion == 2)
{
rf.AddUpdate(new RIPUpdate(RIPEntryAddressFamily.IPv4, new byte[2], re.Subnetmask, IPAddress.Any, re.Destination, (uint)((re.Metric + 1) > 16 ? 16 : (re.Metric + 1))));
}
}
else if ((re.Owner == RoutingEntryOwner.UserStatic || re.Owner == RoutingEntryOwner.System) && this.bRedistributeStatic)
{
if (this.iVersion == 1)
{
rf.AddUpdate(new RIPUpdate(RIPEntryAddressFamily.IPv4, new byte[2], new Subnetmask(), IPAddress.Any, re.Destination, 1));
}
else if (this.iVersion == 2)
{
rf.AddUpdate(new RIPUpdate(RIPEntryAddressFamily.IPv4, new byte[2], re.Subnetmask, IPAddress.Any, re.Destination, 1));
}
}
}
UDP.UDPFrame uf = new UDP.UDPFrame();
uf.DestinationPort = iRIPPort;
uf.SourcePort = iRIPPort;
uf.EncapsulatedFrame = rf;
foreach (IPInterface ipi in lInterfaces)
{
if (ipi != ipiExcludeInterface && ipi.IpAddresses.Length > 0 && !ipiPassiveInterfaces.Contains(ipi))
{
IP.IPv4Frame ipf = new IP.IPv4Frame();
ipf.SourceAddress = ipi.IpAddresses[0];
if (iVersion == 2)
{
ipf.DestinationAddress = ipaRIPv2Address;
}
else if (iVersion == 1)
{
ipf.DestinationAddress = IPAddress.Broadcast;
}
ipf.Protocol = eExNetworkLibrary.IP.IPProtocol.UDP;
ipf.Version = 4;
ipf.EncapsulatedFrame = uf;
TrafficDescriptionFrame tdf = new TrafficDescriptionFrame(null, DateTime.Now);
tdf.EncapsulatedFrame = ipf;
ipi.Send(tdf, IPAddress.Broadcast);
}
}
}
}