[libvirt] [RFC] Image Fleecing for Libvirt (BZ 955734, 905125)

[Wenchao Xia]

于 2013-7-24 21:11, Wenchao Xia 写道:
> 于 2013-7-24 17:44, Paolo Bonzini 写道:
>> Il 24/07/2013 07:38, Wenchao Xia ha scritto:
>>>>>
>>>>> Because libvirt would use a local (Unix) socket to communicate with
>>>>> QEMU
>>>>> and pass the file descriptor, there is no need to authenticate the NBD
>>>>> connection.  There is no need for ticketing, though if necessary we
>>>>> can
>>>>> make QEMU only accept connections from libvirtd's pid.  libvirt and
>>>>> VDSM
>>>>> already do authentication and/or encryption.
>>>
>>>    How do I get the info about IP/port needed to access that snapshot?
>>> call virSnapshotGetInfo(or similar API) later?
>>
>> See above.  You don't, you use the libvirt channel.
>>
>> Paolo
>>
>   So I will got a libvirt API like
> virSnapshotRead(Domain *domain, SnapshotPtr *sn,
>                  uint64 sector_num, uint64 sector_len,
>                  char *buf)?
> then libvirt automatically access the snapshot and fill
> the buffer for user? A API let me access in some way
> would be my concern.
>
I found the API doc online:

int	virDomainBlockPeek		(virDomainPtr dom,
					 const char * disk,
					 unsigned long long offset,
					 size_t size,
					 void * buffer,
					 unsigned int flags)

Guess the problem is extend it to work with snapshot.

-- 
Best Regards

Wenchao Xia