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DhcpServer: strictly enforcing exclusion lists for lease renewals.

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This commit is contained in:
Shreyas Zare
2020-10-24 17:37:44 +05:30
parent 814517fc25
commit 48ea4ac893
1 changed files with 30 additions and 20 deletions
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50
DnsServerCore/Dhcp/DhcpServer.cs
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@@ -353,26 +353,6 @@ namespace DnsServerCore.Dhcp
//send nak
return DhcpMessage.CreateReply(request, IPAddress.Any, IPAddress.Any, null, null, new DhcpOption[] { new DhcpMessageTypeOption(DhcpMessageType.Nak), new ServerIdentifierOption(scope.InterfaceAddress), DhcpOption.CreateEndOption() });
}
Lease reservedLease = scope.GetReservedLease(request);
if (reservedLease == null)
{
if (leaseOffer.Type == LeaseType.Reserved)
{
//client's reserved has been removed so release the current lease and send NAK to allow it to get new allocation
scope.ReleaseLease(leaseOffer);
return DhcpMessage.CreateReply(request, IPAddress.Any, IPAddress.Any, null, null, new DhcpOption[] { new DhcpMessageTypeOption(DhcpMessageType.Nak), new ServerIdentifierOption(scope.InterfaceAddress), DhcpOption.CreateEndOption() });
}
}
else
{
if (!reservedLease.Address.Equals(leaseOffer.Address))
{
//client has a new reserved lease so release the current lease and send NAK to allow it to get new allocation
scope.ReleaseLease(leaseOffer);
return DhcpMessage.CreateReply(request, IPAddress.Any, IPAddress.Any, null, null, new DhcpOption[] { new DhcpMessageTypeOption(DhcpMessageType.Nak), new ServerIdentifierOption(scope.InterfaceAddress), DhcpOption.CreateEndOption() });
}
}
}
else
{
@@ -393,6 +373,36 @@ namespace DnsServerCore.Dhcp
return DhcpMessage.CreateReply(request, IPAddress.Any, IPAddress.Any, null, null, new DhcpOption[] { new DhcpMessageTypeOption(DhcpMessageType.Nak), new ServerIdentifierOption(scope.InterfaceAddress), DhcpOption.CreateEndOption() });
}
}
if ((leaseOffer.Type == LeaseType.Dynamic) && scope.IsAddressExcluded(leaseOffer.Address))
{
//client ip is excluded for dynamic allocations
scope.ReleaseLease(leaseOffer);
//send nak
return DhcpMessage.CreateReply(request, IPAddress.Any, IPAddress.Any, null, null, new DhcpOption[] { new DhcpMessageTypeOption(DhcpMessageType.Nak), new ServerIdentifierOption(scope.InterfaceAddress), DhcpOption.CreateEndOption() });
}
Lease reservedLease = scope.GetReservedLease(request);
if (reservedLease == null)
{
if (leaseOffer.Type == LeaseType.Reserved)
{
//client's reserved has been removed so release the current lease and send NAK to allow it to get new allocation
scope.ReleaseLease(leaseOffer);
//send nak
return DhcpMessage.CreateReply(request, IPAddress.Any, IPAddress.Any, null, null, new DhcpOption[] { new DhcpMessageTypeOption(DhcpMessageType.Nak), new ServerIdentifierOption(scope.InterfaceAddress), DhcpOption.CreateEndOption() });
}
}
else
{
if (!reservedLease.Address.Equals(leaseOffer.Address))
{
//client has a new reserved lease so release the current lease and send NAK to allow it to get new allocation
scope.ReleaseLease(leaseOffer);
//send nak
return DhcpMessage.CreateReply(request, IPAddress.Any, IPAddress.Any, null, null, new DhcpOption[] { new DhcpMessageTypeOption(DhcpMessageType.Nak), new ServerIdentifierOption(scope.InterfaceAddress), DhcpOption.CreateEndOption() });
}
}
}
else
{