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;
}
static IDhcpOption ParseDhcpOption(
byte optionCode,
byte length,
byte[] srcBuffer,
int offset)
{
byte type = optionCode;
switch (optionCode)
{
case DhcpSubnetMask.OptionCode:
return(DhcpIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpTimeOffset.OptionCode:
return(DhcpDWordOption.Parse(type, length, srcBuffer, offset));
case DhcpRouter.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpTimeServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpNameServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpDomainNameServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpLogServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpCookieServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpLprServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpImpressServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpResourceLocationServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpHostName.OptionCode:
return(DhcpStringOption.Parse(type, length, srcBuffer, offset));
case DhcpBootFileSize.OptionCode:
return(DhcpWordOption.Parse(type, length, srcBuffer, offset));
case DhcpMeritDumpFile.OptionCode:
return(DhcpStringOption.Parse(type, length, srcBuffer, offset));
case DhcpDomainName.OptionCode:
return(DhcpStringOption.Parse(type, length, srcBuffer, offset));
case DhcpSwapServer.OptionCode:
return(DhcpIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpRootPath.OptionCode:
return(DhcpStringOption.Parse(type, length, srcBuffer, offset));
case DhcpExtensionsPath.OptionCode:
return(DhcpStringOption.Parse(type, length, srcBuffer, offset));
case DhcpIPForwarding.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpForwardRemoteSourceRoute.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpPolicyFilter.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpMaximumDatagramReassembly.OptionCode:
return(DhcpWordOption.Parse(type, length, srcBuffer, offset));
case DhcpDefaultTtl.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpPathMtuAgingTimeout.OptionCode:
return(DhcpDWordOption.Parse(type, length, srcBuffer, offset));
case DhcpPathMtuPlateauTable.OptionCode:
return(DhcpMultiWordOption.Parse(type, length, srcBuffer, offset));
case DhcpInterfaceMtu.OptionCode:
return(DhcpWordOption.Parse(type, length, srcBuffer, offset));
case DhcpAllSubnetsLocal.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpBroadcastAddress.OptionCode:
return(DhcpIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpMaskDiscovery.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpMaskSupplier.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpRouterDiscovery.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpRouterSolicitationAddress.OptionCode:
return(DhcpIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpStaticRoutes.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpTrailerEncapsulate.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpArpCacheTimeout.OptionCode:
return(DhcpDWordOption.Parse(type, length, srcBuffer, offset));
case DhcpEthernetEncapsulation.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpTcpDefaultTtl.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpTcpKeepalive.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpTcpKeepaliveGarbage.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpNisDomain.OptionCode:
return(DhcpStringOption.Parse(type, length, srcBuffer, offset));
case DhcpNisServers.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpNtpServers.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpVendorSpecific.OptionCode:
return(DhcpMultiByteOption.Parse(type, length, srcBuffer, offset));
case DhcpNetBiosNameServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpNetBiosDistributionServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpNetBiosType.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpNetBiosScope.OptionCode:
return(DhcpMultiDWordOption.Parse(type, length, srcBuffer, offset));
case DhcpXWindowsFontServer.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpXWindowsDisplayManager.OptionCode:
return(DhcpMultiIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpRequestedIPAddress.OptionCode:
return(DhcpIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpIPAddressLeaseTime.OptionCode:
return(DhcpDWordOption.Parse(type, length, srcBuffer, offset));
case DhcpOverloadIndicator.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpMessageType.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
case DhcpServerID.OptionCode:
return(DhcpIPv4Option.Parse(type, length, srcBuffer, offset));
case DhcpParameterRequest.OptionCode:
return(DhcpMultiByteOption.Parse(type, length, srcBuffer, offset));
case DhcpMessage.OptionCode:
return(DhcpStringOption.Parse(type, length, srcBuffer, offset));
case DhcpMaximumMessageSize.OptionCode:
return(DhcpWordOption.Parse(type, length, srcBuffer, offset));
case DhcpRenewalTime.OptionCode:
return(DhcpDWordOption.Parse(type, length, srcBuffer, offset));
case DhcpRebindingTime.OptionCode:
return(DhcpDWordOption.Parse(type, length, srcBuffer, offset));
case DhcpClassID.OptionCode:
return(DhcpStringOption.Parse(type, length, srcBuffer, offset));
case DhcpClientID.OptionCode:
return(DhcpMultiByteOption.Parse(type, length, srcBuffer, offset));
case DhcpAutoConfigure.OptionCode:
return(DhcpByteOption.Parse(type, length, srcBuffer, offset));
default: return(null);
}
}
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);
}
