public bool AddrOnLink(DhcpV4RequestedIpAddressOption requestedIpOption, DhcpLink clientLink)
{
bool onLink = true;
if (requestedIpOption != null)
{
IPAddress requestedIp = IPAddress.Parse(requestedIpOption.GetIpAddress());
if (!clientLink.GetSubnet().Contains(requestedIp))
{
onLink = false;
}
}
return(onLink);
}
public override bool PreProcess()
{
if (!base.PreProcess())
{
return(false);
}
requestedIpAddrOption = (DhcpV4RequestedIpAddressOption)_requestMsg.GetDhcpOption(DhcpConstants.V4OPTION_REQUESTED_IP);
if (requestedIpAddrOption == null)
{
log.Warn("Ignoring Decline message: " + "Requested IP option is null");
return(false);
}
return(true);
}
/**
* Get the Requested IP addresses from the client message, if any was provided.
*
* @param requestMsg the request msg
*
* @return a list of InetAddresses containing the requested IP, or null if none requested or
* if the requested IP is bogus
*/
private List <IPAddress> GetInetAddrs(DhcpMessage requestMsg)
{
List <IPAddress> inetAddrs = new List <IPAddress>();
DhcpV4RequestedIpAddressOption reqIpOption = (DhcpV4RequestedIpAddressOption)
requestMsg.GetDhcpOption(DhcpConstants.V4OPTION_REQUESTED_IP);
if (reqIpOption != null)
{
IPAddress inetAddr =
IPAddress.Parse(reqIpOption.GetIpAddress());
inetAddrs = new List <IPAddress>();
inetAddrs.Add(inetAddr);
}
return(inetAddrs);
}
private DhcpV4Message BuildRequestMessage(DhcpV4Message offer)
{
DhcpV4Message msg = new DhcpV4Message(IPAddress.Parse("0.0.0.0"), new IPEndPoint(serverAddr, serverPort));
msg.SetOp((short)DhcpConstants.V4_OP_REQUEST);
msg.SetTransactionId(offer.GetTransactionId());
msg.SetHtype((short)1); // ethernet
msg.SetHlen((byte)6);
msg.SetChAddr(offer.GetChAddr());
msg.SetGiAddr(clientAddr); // look like a relay to the DHCP server
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_REQUEST);
msg.PutDhcpOption(msgTypeOption);
DhcpV4RequestedIpAddressOption reqIpOption = new DhcpV4RequestedIpAddressOption();
reqIpOption.SetIpAddress(offer.GetYiAddr().ToString());
msg.PutDhcpOption(reqIpOption);
return(msg);
}
/* (non-Javadoc)
* @see com.jagornet.dhcpv6.server.request.BaseDhcpProcessor#preProcess()
*/
public override bool PreProcess()
{
if (!base.PreProcess())
{
return(false);
}
DhcpV4ServerIdOption requestedServerIdOption = _requestMsg.GetDhcpV4ServerIdOption();
requestedIpAddrOption = (DhcpV4RequestedIpAddressOption)
_requestMsg.GetDhcpOption(DhcpConstants.V4OPTION_REQUESTED_IP);
// first determine what KIND of request we are dealing with
if (_requestMsg.GetCiAddr().Equals(DhcpConstants.ZEROADDR_V4))
{
// the ciAddr MUST be 0.0.0.0 for Init-Reboot and Selecting
if (requestedServerIdOption == null)
{
// init-reboot MUST NOT have server-id option
type = RequestType.Request_InitReboot;
}
else
{
// selecting MUST have server-id option
type = RequestType.Request_Selecting;
}
}
else
{
// the ciAddr MUST NOT be 0.0.0.0 for Renew and Rebind
if (_requestMsg.IsUnicast())
{
// renew is unicast
// NOTE: this will not happen if the v4 broadcast interface used at startup,
// but handling of DHCPv4 renew/rebind is the same anyway
type = RequestType.Request_Renewing;
}
else
{
// rebind is broadcast
type = RequestType.Request_Rebinding;
}
}
if ((type == RequestType.Request_InitReboot) || (type == RequestType.Request_Selecting))
{
if (requestedIpAddrOption == null)
{
log.Warn("Ignoring " + type + " message: " +
"Requested IP option is null");
return(false);
}
if (type == RequestType.Request_Selecting)
{
String requestedServerId = requestedServerIdOption.GetIpAddress();
string myServerId = _dhcpV4ServerIdOption.GetIpAddress();
if (!myServerId.Equals(requestedServerId))
{
log.Warn("Ignoring " + type + " message: " +
"Requested ServerId: " + requestedServerIdOption +
" My ServerId: " + _dhcpV4ServerIdOption);
return(false);
}
}
}
else
{ // type == Renewing or Rebinding
if (requestedIpAddrOption != null)
{
log.Warn("Ignoring " + type + " message: " +
"Requested IP option is not null");
return(false);
}
}
return(true);
}
