[Libguestfs] [PATCH v2 API PROPOSAL 0/5] inspection Add network interfaces to inspection data.

[Brett Thurber]

On Tue, Oct 2, 2018 at 9:15 AM Richard W.M. Jones <rjones at redhat.com> wrote:

> I wrote some code which can get this kind of information from the
> Windows Registry:
>
>     <interfaces>
>       <interface name="Ethernet" type="unknown">
>         <parameters>
>           <parameter name="bootproto">dhcp</parameter>
>           <parameter name="gateway">10.0.2.2</parameter>
>           <parameter name="ipaddr">10.0.2.15</parameter>
>           <parameter name="win:AddressType">0</parameter>
>           <parameter name="win:DhcpConnForceBroadcastFlag">0</parameter>
>           <parameter name="win:DhcpGatewayHardware">
> </parameter>
>           <parameter name="win:DhcpGatewayHardwareCount">1</parameter>
>           <parameter name="win:DhcpNameServer">10.0.2.3</parameter>
>           <parameter name="win:DhcpServer">10.0.2.2</parameter>
>           <parameter name="win:DhcpSubnetMask">255.255.255.0</parameter>
>           <parameter name="win:DhcpSubnetMaskOpt">255.255.255.0</parameter>
>           <parameter name="win:Domain"></parameter>
>           <parameter name="win:EnableDeadGWDetect">1</parameter>
>           <parameter name="win:IsServerNapAware">0</parameter>
>           <parameter name="win:Lease">86400</parameter>
>           <parameter name="win:LeaseObtainedTime">1536802270</parameter>
>           <parameter name="win:LeaseTerminatesTime">1536888670</parameter>
>           <parameter name="win:NameServer"></parameter>
>           <parameter name="win:RegisterAdapterName">0</parameter>
>           <parameter name="win:RegistrationEnabled">1</parameter>
>           <parameter name="win:T1">1536845470</parameter>
>           <parameter name="win:T2">1536877870</parameter>
>           <parameter name="win:UseZeroBroadcast">0</parameter>
>         </parameters>
>       </interface>
>       <interface name="Local Area Connection* 9" type="unknown">
>         <parameters>
>           <parameter name="bootproto">dhcp</parameter>
>           <parameter name="win:Domain"></parameter>
>           <parameter name="win:EnableDeadGWDetect">1</parameter>
>           <parameter name="win:NameServer"></parameter>
>           <parameter name="win:RegisterAdapterName">0</parameter>
>           <parameter name="win:RegistrationEnabled">1</parameter>
>           <parameter name="win:UseZeroBroadcast">0</parameter>
>         </parameters>
>       </interface>
>     </interfaces>
>
> Unfortunately - no MAC address!
>
> That screws up the plan greatly, since without the MAC address there
> is no way to associate network adapters with hardware.
>
> Well, that's not quite true.  There is some PCI address information
> available.  For example for the above guest we have:
>
>
> [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE10318}\{307052F7-EE0A-4FD2-8CE6-212EFDD711B0}\Connection]
> "DefaultNameResourceId"=dword:0000076c
> "DefaultNameTargetsPort"=dword:00000000
> "Name"=str(1):"Ethernet"
>
> "PnPInstanceId"=str(1):"PCI\VEN_10EC&DEV_8139&SUBSYS_11001AF4&REV_20\3&13C0B0C5&0&18"
>
> It's not clear if we could go from this to a hypervisor network
> interface however.
>
> Also the MAC address of the guest is visible in some very obscure
> places in the registry in binary blobs.
>
> I don't think I've yet got a full picture of how network adapters are
> stored in Windows.
>
> Rich.
>

It's a bit of a mess based on some of my investigation today.  From what I
have read s it even may differ from 2008/2012 to 2016.

We are maintaining the MAC address today as part of migration, for the new
virtio NIC.  Instead of trying to find the MAC address is there a way to
move the IP config over based on vmxnet or IE1000 enumeration?  Thinking of
other options outside of MAC linkage.


>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> libguestfs lets you edit virtual machines.  Supports shell scripting,
> bindings from many languages.  http://libguestfs.org
>


-- 
Brett Thurber - RHCA, RHCVA
Engineering Manager and Sr. Principal Software Engineer, Solutions
Engineering
Products & Technologies Group, Red Hat
Mobile: +1 (512) 547-9282
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