public override bool Process()
{
byte[] chAddr = _requestMsg.GetChAddr();
V4AddrBindingManager bindingMgr = _dhcpServerConfig.GetV4AddrBindingMgr();
if (bindingMgr != null)
{
log.Info("Processing Decline" + " from chAddr=" + Util.ToHexString(chAddr) + " requestedIp=" + requestedIpAddrOption.GetIpAddress());
Binding binding = bindingMgr.FindCurrentBinding(_clientLink, chAddr, _requestMsg);
if (binding != null)
{
HashSet <BindingObject> bindingObjs = binding.GetBindingObjects();
if ((bindingObjs != null) && bindingObjs.Count != 0)
{
V4BindingAddress bindingAddr = (V4BindingAddress)bindingObjs.First();
bindingMgr.DeclineIaAddress(binding, bindingAddr);
}
else
{
log.Error("No binding addresses in binding for client: " + Util.ToHexString(chAddr));
}
}
else
{
log.Error("No Binding available for client: " + Util.ToHexString(chAddr));
}
}
else
{
log.Error("Unable to process V4 Decline:" + " No V4AddrBindingManager available");
}
return(false); // no reply for v4 decline
}
protected void ProcessDdnsUpdates(bool sendUpdates)
{
bool doForwardUpdate = true;
DhcpV4ClientFqdnOption clientFqdnOption = (DhcpV4ClientFqdnOption)_requestMsg.GetDhcpOption(DhcpConstants.V4OPTION_CLIENT_FQDN);
DhcpV4HostnameOption hostnameOption = (DhcpV4HostnameOption)_requestMsg.GetDhcpOption(DhcpConstants.V4OPTION_HOSTNAME);
if (clientFqdnOption == null && hostnameOption == null)
{
//TODO allow name generation?
log.Debug("No Client FQDN nor hostname option in request. Skipping DDNS update processing.");
return;
}
string fqdn = "";
string domain = DhcpServerPolicies.DffectivePolicy(_clientLink.GetLink(), Property.DDNS_DOMAIN);
DhcpV4ClientFqdnOption replyFqdnOption = null;
if (clientFqdnOption != null)
{
replyFqdnOption = new DhcpV4ClientFqdnOption();
replyFqdnOption.SetDomainName(clientFqdnOption.GetDomainName());
replyFqdnOption.SetUpdateABit(false);
replyFqdnOption.SetOverrideBit(false);
replyFqdnOption.SetNoUpdateBit(false);
replyFqdnOption.SetEncodingBit(clientFqdnOption.GetEncodingBit());
replyFqdnOption.SetRcode1((short)0xff); // RFC 4702 says server should set to 255
replyFqdnOption.SetRcode2((short)0xff); // RFC 4702 says server should set to 255
fqdn = clientFqdnOption.GetDomainName();
if ((fqdn == null) || (fqdn.Length <= 0))
{
log.Error("Client FQDN option domain name is null/empty. No DDNS udpates performed.");
replyFqdnOption.SetNoUpdateBit(true); // tell client that server did no updates
_replyMsg.PutDhcpOption(replyFqdnOption);
return;
}
string policy = DhcpServerPolicies.EffectivePolicy(_requestMsg, _clientLink.GetLink(), Property.DDNS_UPDATE);
log.Info("Server configuration for ddns.update policy: " + policy);
if ((policy == null) || policy.Contains("none"))
{
log.Info("Server configuration for ddns.update policy is null or 'none'." + " No DDNS updates performed.");
replyFqdnOption.SetNoUpdateBit(true); // tell client that server did no updates
_replyMsg.PutDhcpOption(replyFqdnOption);
return;
}
if (clientFqdnOption.GetNoUpdateBit() && policy.Contains("honorNoUpdate"))
{
log.Info("Client FQDN NoUpdate flag set. Server configured to honor request." + " No DDNS updates performed.");
replyFqdnOption.SetNoUpdateBit(true); // tell client that server did no updates
_replyMsg.PutDhcpOption(replyFqdnOption);
//TODO: RFC 4704 Section 6.1
// ...the server SHOULD delete any RRs that it previously added
// via DNS updates for the client.
return;
}
if (!clientFqdnOption.GetUpdateABit() && policy.Contains("honorNoA"))
{
log.Info("Client FQDN NoA flag set. Server configured to honor request." + " No FORWARD DDNS updates performed.");
doForwardUpdate = false;
}
else
{
replyFqdnOption.SetUpdateABit(true); // server will do update
if (!clientFqdnOption.GetUpdateABit())
{
replyFqdnOption.SetOverrideBit(true); // tell client that we overrode request flag
}
}
if (!String.IsNullOrEmpty(domain))
{
log.Info("Server configuration for domain policy: " + domain);
// if there is a configured domain, then replace the domain provide by the client
int dot = fqdn.IndexOf('.');
if (dot > 0)
{
fqdn = fqdn.Substring(0, dot + 1) + domain;
}
else
{
fqdn = fqdn + "." + domain;
}
replyFqdnOption.SetDomainName(fqdn);
}
// since the client DID send option 81, return it in the reply
_replyMsg.PutDhcpOption(replyFqdnOption);
}
else
{
// The client did not send an FQDN option, so we'll try to formulate the FQDN
// from the hostname option combined with the DDNS_DOMAIN policy setting.
// A replyFqdnOption is fabricated to be stored with the binding for use
// with the release/expire binding processing to remove the DDNS entry.
replyFqdnOption = new DhcpV4ClientFqdnOption();
fqdn = hostnameOption.GetString();
if (!String.IsNullOrEmpty(domain))
{
log.Info("Server configuration for domain policy: " + domain);
fqdn = fqdn + "." + domain;
// since the client did NOT send option 81, do not put
// the fabricated fqdnOption into the reply packet
// but set the option so that is can be used below
// when storing the fqdnOption to the database, so
// that it can be used if/when the lease expires
replyFqdnOption.SetDomainName(fqdn);
// server will do the A record update, so set the flag
// for the option stored in the database, so server will
// remove the A record when the lease expires
replyFqdnOption.SetUpdateABit(true);
}
else
{
log.Error("No DDNS domain configured. No DDNS udpates performed.");
replyFqdnOption.SetNoUpdateBit(true); // tell client that server did no updates
_replyMsg.PutDhcpOption(replyFqdnOption);
return;
}
}
if (sendUpdates)
{
foreach (Binding binding in _bindings)
{
if (binding.GetState() == Binding.COMMITTED)
{
HashSet <BindingObject> bindingObjs = binding.GetBindingObjects();
if (bindingObjs != null)
{
foreach (var bindingObj in bindingObjs)
{
V4BindingAddress bindingAddr = (V4BindingAddress)bindingObj;
DhcpConfigObject configObj = bindingAddr.GetConfigObj();
DdnsCallback ddnsComplete = new DhcpV4DdnsComplete(bindingAddr, replyFqdnOption);
DdnsUpdater ddns = new DdnsUpdater(_requestMsg, _clientLink.GetLink(), configObj, bindingAddr.GetIpAddress(), fqdn, _requestMsg.GetChAddr(), configObj.GetValidLifetime(), doForwardUpdate, false, ddnsComplete);
ddns.ProcessUpdates();
}
}
}
}
}
}
public DhcpV4DdnsComplete(V4BindingAddress bindingAddr, DhcpV4ClientFqdnOption replyFqdnOption)
{
_bindingAddr = bindingAddr;
_fqdnOption = replyFqdnOption;
}
