internal void UninstallDhcpOptions()
{
DhcpIPv4Option address = (DhcpIPv4Option)
activeDhcpOptions[DhcpRequestedIPAddress.OptionCode];
IPv4 ifAddress = address.Value;
//
// Remove routes associated with interface address
//
HostConfiguration hostConfiguration = IP.GetHostConfiguration();
hostConfiguration.RoutingTable.DeleteInterfaceRoutes(ifAddress);
//
// Remove name server
//
DhcpMultiIPv4Option dnsServers =
activeDhcpOptions[DhcpDomainNameServer.OptionCode]
as DhcpMultiIPv4Option;
if (dnsServers != null)
{
foreach (IPv4 server in dnsServers.Values)
{
hostConfiguration.AddNameServer(server);
}
}
//
// Leave domain name in place
//
// If we wanted to remove it...
DhcpStringOption domain =
activeDhcpOptions[DhcpDomainName.OptionCode]
as DhcpStringOption;
string domainName = hostConfiguration.GetDomainName();
if (domain != null && domainName == domain.Value)
{
hostConfiguration.SetDomainName("");
}
//
// Remove interface address bindings
//
hostConfiguration.Bindings.Flush(adapter, ifAddress);
activeDhcpOptions = null;
}
//There are several different flavors of implementation for WriteTo
//BSD Unix assigns an ephemeral port for every packet, while Linux
//picks an ephemeral port and assigns it permanantly. I'm unsure of the
//behavior of windows.
public bool WriteTo(IPv4 remoteAddr,
ushort remotePort,
Bytes buffer)
{
//allocate a local port
if (localPort == 0)
{
bool rc;
DebugPrint("Assigning local port to process for WriteTo\n");
rc = AssignNextAvailablePort();
VTable.Assert(rc);
}
if (localIPAddress == IPv4.Any)
{
HostConfiguration hostConfiguration = IP.GetHostConfiguration();
RouteEntry e = hostConfiguration.RoutingTable.Lookup(remoteAddr);
if (e != null)
{
localIPAddress = e.InterfaceAddress;
DebugPrint("local address now {0}\n", localIPAddress);
}
else
{
DebugPrint("No route for {0}\n", remoteAddr);
}
}
int headerSize = EthernetHeader.Size + IpHeader.Size + UDPHeader.Size;
Bytes header = new Bytes(new byte[headerSize]);
WriteCompleteUDPHeader(header, buffer, buffer.Length);
DebugPrint("Sending UDP packet\n");
IP.SendOutgoingPacket(header, buffer, remoteAddr);
return(true);
}
internal bool InstallDhcpOptions(SortedList dhcpOptions)
{
if (activeDhcpOptions != null)
{
UninstallDhcpOptions();
}
//
// Add interface address binding
//
DhcpIPv4Option address =
dhcpOptions[DhcpRequestedIPAddress.OptionCode]
as DhcpIPv4Option;
DhcpIPv4Option netmask =
dhcpOptions[DhcpSubnetMask.OptionCode] as DhcpIPv4Option;
DhcpMultiIPv4Option routers =
dhcpOptions[DhcpRouter.OptionCode] as DhcpMultiIPv4Option;
if (address == null || netmask == null || routers == null ||
routers.Values.Length == 0)
{
return(false);
}
HostConfiguration hostConfiguration = IP.GetHostConfiguration();
hostConfiguration.Bindings.Add(
adapter, new InterfaceIPConfiguration(address.Value,
netmask.Value,
routers.Values[0])
);
//
// Register Domain name
//
DhcpStringOption domain =
dhcpOptions[DhcpDomainName.OptionCode] as DhcpStringOption;
// string domainName = ip.HostConfiguration.GetDomainName();
// never used
if (domain != null)
{
hostConfiguration.SetDomainName(domain.Value);
}
//
// Add DNS servers
//
DhcpMultiIPv4Option dnsServers =
dhcpOptions[DhcpDomainNameServer.OptionCode]
as DhcpMultiIPv4Option;
if (dnsServers != null)
{
foreach (IPv4 server in dnsServers.Values)
{
hostConfiguration.AddNameServer(server);
}
}
//
// Install static routes
//
DhcpMultiIPv4Option staticRoutes =
dhcpOptions[DhcpStaticRoutes.OptionCode]
as DhcpMultiIPv4Option;
if (staticRoutes != null)
{
int routeCount = staticRoutes.Values.Length & ~1; // pairs
for (int i = 0; i < routeCount; i += 2)
{
IPv4 destination = staticRoutes.Values[i];
IPv4 gateway = staticRoutes.Values[i + 1];
IPv4 ifAddress = address.Value;
hostConfiguration.RoutingTable.AddRoute(
new RouteEntry(destination, gateway, ifAddress,
RouteEntry.DefaultRouteMetric, 0)
);
}
}
activeDhcpOptions = dhcpOptions;
return(true);
}
