public virtual bool PreProcess()
{
IPAddress localSocketAddr = _requestMsg.GetLocalAddress();
byte[] chAddr = _requestMsg.GetChAddr();
//判斷是否有MAC
if ((chAddr == null) || (chAddr.Length == 0) || IsIgnoredMac(chAddr))
{
//log.Warn("Ignorning request message from client: mac=" + Util.toHexString(chAddr));
return(false);
}
_clientLink = _dhcpServerConfig.FindDhcpLinkV4(localSocketAddr, (IPAddress)_clientLinkAddress);
if (_clientLink == null)
{
//log.Error("No Link configured for DHCPv4 client request: " + " localAddress=" + localSocketAddr.GetAddress().GetHostAddress() +" clientLinkAddress=" + clientLinkAddress.getHostAddress());
return(false); // must configure link for server to reply
}
/* TODO: check if this DOS mitigation is useful
*
* boolean isNew = recentMsgs.add(requestMsg);
* if (!isNew) {
* if (log.isDebugEnabled())
* log.debug("Dropping recent message");
* return false; // don't process
* }
*
* if (log.isDebugEnabled())
* log.debug("Processing new message");
*
* long timer = DhcpServerPolicies.effectivePolicyAsLong(clientLink.getLink(),
* Property.DHCP_PROCESSOR_RECENT_MESSAGE_TIMER);
* if (timer > 0) {
* recentMsgPruner.schedule(new RecentMsgTimerTask(requestMsg), timer);
* }
*/
return(true); // ok to process
}