protected bool AllIaAddrsOnLink(DhcpV6IaNaOption dhcpIaNaOption, DhcpLink clientLink)
{
bool onLink = true;
// assume all IPs are on link
if ((dhcpIaNaOption != null))
{
List <DhcpV6IaAddrOption> iaAddrOpts = dhcpIaNaOption.GetIaAddrOptions();
if ((iaAddrOpts != null))
{
foreach (DhcpV6IaAddrOption iaAddrOpt in iaAddrOpts)
{
if (this.clientLink.GetSubnet().GetSubnetAddress().IsIPv6LinkLocal)
{
// if the Link address is link-local, then check if the
// address is within one of the pools configured for this
// local Link, which automatically makes this server
// "authoritative" (in ISC parlance) for this local net
v6AddressPool p = DhcpServerConfiguration.FindNaAddrPool(this.clientLink.GetLink(), iaAddrOpt.GetInetAddress());
if ((p == null))
{
log.Info(("No local address pool found for requested IA_NA: " + (iaAddrOpt.ToString() + " - considered to be off link")));
iaAddrOpt.SetPreferredLifetime(0);
iaAddrOpt.SetValidLifetime(0);
onLink = false;
}
}
else
{
// it the Link address is remote, then check
// if the address is valid for that link
if (!this.clientLink.GetSubnet().Contains(iaAddrOpt.GetInetAddress()))
{
log.Info("Setting zero(0) lifetimes for off link address: " + iaAddrOpt.GetIpAddress());
iaAddrOpt.SetPreferredLifetime(0);
iaAddrOpt.SetValidLifetime(0);
onLink = false;
}
}
}
}
}
return(onLink);
}
/**
* Effective policy.
*
* @param requestMsg the request msg
* @param link the link
* @param prop the prop
* @return the string
*/
public static string EffectivePolicy(DhcpV4Message requestMsg, link link, Property prop)
{
string policy = null;
if ((requestMsg != null) && (link != null))
{
List <linkFilter> linkFilters = link.linkFilters;
if (linkFilters != null)
{
foreach (linkFilter linkFilter in linkFilters)
{
if (DhcpServerConfiguration.MsgMatchesFilter(requestMsg, linkFilter))
{
policy = GetPolicy(linkFilter.policies, prop.Key());
}
}
// if the client request matches at least one filter on the link,
// and that filter has configured a value for the policy, then return
// that value from the last filter that the client matches
if (policy != null)
{
return(policy);
}
}
}
if (link != null)
{
// client does not match a link filter
// get the value of the policy on the link, if any
policy = GetPolicy(link.policies, prop.Key());
if (policy != null)
{
return(policy);
}
}
return(GlobalPolicy(prop));
}
protected BindingPool FindBindingPool(link link, IPAddress inetAddr, DhcpMessage requestMsg)
{
List <BindingPool> bps = bindingPoolMap.ContainsKey(link.Address) ? bindingPoolMap[link.Address] : null;
if ((bps != null) && bps.Count > 0)
{
foreach (BindingPool bindingPool in bps)
{
// if (log.isDebugEnabled()) {
// if (bindingPool instanceof AddressBindingPool) {
// AddressBindingPool abp = (AddressBindingPool) bindingPool;
// log.Debug("AddressBindingPool: " + abp.toString());
// log.Debug("FreeList: " + abp.freeListToString());
// }
// }
if (bindingPool.Contains(inetAddr))
{
if ((requestMsg != null) && (bindingPool.GetLinkFilter() != null))
{
if (DhcpServerConfiguration.MsgMatchesFilter(requestMsg,
bindingPool.GetLinkFilter()))
{
_log.Info("Found filter binding pool: " + bindingPool);
return(bindingPool);
}
}
else
{
_log.Info("Found binding pool: " + bindingPool);
return(bindingPool);
}
}
}
}
return(null);
}
/// <summary>
/// Gets the next free address from the pool(s) configured for the client link.
/// </summary>
/// <param name="clientLink">client link</param>
/// <param name="requestMsg">request message</param>
/// <returns></returns>
protected IPAddress GetNextFreeAddress(DhcpLink clientLink, DhcpMessage requestMsg, IPAddress clientV4IPAddress)
{
if (clientLink != null)
{
List <BindingPool> pools = bindingPoolMap.ContainsKey(clientLink.GetLinkAddress()) ? bindingPoolMap[clientLink.GetLinkAddress()] : null;
if ((pools != null) && pools.Count > 0)
{
foreach (BindingPool bp in pools)
{
linkFilter filter = bp.GetLinkFilter();
if ((requestMsg != null) && (filter != null))
{
if (!DhcpServerConfiguration.MsgMatchesFilter(requestMsg, filter))
{
_log.Info("Client request does not match filter, skipping pool: " + bp.ToString());
continue;
}
}
_log.Debug("Getting next available address from pool: " + bp.ToString());
if (clientV4IPAddress != null)
{
//if (bp.GetV6AssignRule() != AssignDhcpV6Rule.Noen && bp.GetV6AssignRule() != AssignDhcpV6Rule.AssignV6IPAndDNSByV6Pool)
//{
// string[] clientV4IPArray = clientV4IPAddress.ToString().Split('.');
// IPAddress clientV6Addr = null;
// if (bp.GetV6AssignRule() == AssignDhcpV6Rule.AssignV6IPAndDNSByTransferV4IPLast2)
// {
// clientV6Addr = bp.GetNextAvailableAddress(clientV4IPArray[2], clientV4IPArray[3]);
// }
// else
// {
// clientV6Addr = bp.GetNextAvailableAddress("", clientV4IPArray[3]);
// }
// if (clientV6Addr != null)
// {
// return clientV6Addr;
// }
// // Callback sreach V4 IP Using MAC
// // 依照回傳的 IPv4 IP 決定回傳的 IPv6 IP
// // Return new IPAddress(clientLink.GetLinkAddress() + "IPv4 尾 1 碼或 2 碼")
// // byte[] v4TransferV6 = new byte[] { 32, 1, 176, 48, 17, 40, 1, 96, 0, 0, 0, 0, 0, 97, 1, 151 };
// // return new IPAddress(v4TransferV6);
// // 若無 v4 IP 則依照既有的邏輯進行派發，派發的 IP 從::255:255 以後開始派發
//}
}
IPAddress free = bp.GetNextAvailableAddress();
if (free != null)
{
_log.Debug("Found next available address: " + free.ToString());
return(free);
}
else
{
// warning here, b/c there may be more pools
_log.Warn("No free addresses available in pool: " + bp.ToString());
}
}
// if we get this far, then we did not find any free(virgin) addresses
// so we must start searching for any that can be used in the pools
foreach (BindingPool bp in pools)
{
linkFilter filter = bp.GetLinkFilter();
if ((requestMsg != null) && (filter != null))
{
if (!DhcpServerConfiguration.MsgMatchesFilter(requestMsg, filter))
{
_log.Info("Client request does not match filter, skipping pool: " + bp.ToString());
continue;
}
}
IPAddress reused = ReuseAvailableAddress(bp);
if (reused != null)
{
return(reused);
}
}
}
else
{
_log.Error("No Pools defined in server configuration for Link: " + clientLink.GetLinkAddress());
}
}
else
{
throw new Exception("ClientLink is null");
}
return(null);
}
