Yes, I understand. But how do retrieve its DNS record?
在 2012-9-22 下午5:17，"Zubair Nabi" <zn.zubairn...@gmail.com>写道：
> Hi Alan,
>
> Currently, we just open the website through its hostname and check its
> status code. What I propose is that we retrieve its A DNS record as well
> which would would give us the IP addresses for that domain name. That
> information along with the NS and SOA records can be used by the aggregator
> to check whether we accessed the actual website or were we redirected to a
> default page. The reason the agents do this themselves is that they only
> have access to local information.
>
> On Fri, Sep 21, 2012 at 6:57 PM, Zhongjie Wang <wzj...@gmail.com> wrote:
>
>> Hi Zubair,
>> Yeah, actually I've known the things you mentioned. For some ISPs
>> in China, if their DNS servers couldn't resolve a DNS request, it will
>> return a default "error" page, which IP address is owned by the ISP. I
>> don't know whether this could be called a DNS injection. But it's a good
>> habit to examine the IP address for each website. How do you handle a
>> website with multiple IP addresses like google.com?
>>
>> Cheers,
>> Alan
>>
>> On Thu, Sep 20, 2012 at 9:28 PM, Zubair Nabi <zn.zubairn...@gmail.com>wrote:
>>
>>> Guys,
>>>
>>> I just realised that some censoring entities such as the GFW of China
>>> use DNS injection to censor websites. Currently, we decide whether a
>>> website is blocked or not by analysing its HTTP status code (i.e. if its
>>> 200 or not). This will not work in case of DNS injection, because the HTTP
>>> status code would be 200 even though we won't be able to access the actual
>>> website. Therefore, I propose performing DNS look up for each website and
>>> adding the A, SOA, and NS DNS records to the website report. On the basis
>>> on these, the aggregator can decide whether a website is blocked or not.
>>> You can read up on these records here:
>>> http://www.debianhelp.co.uk/dnsrecords.htm. I've already added this
>>> mechanism to the Android agent.
>>> Any objections or comments on this?
>>>
>>> --
>>> Best,
>>> Zubair
>>>
>>>
>>>
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>>
>>
>> --
>> Zhongjie Wang
>> Master Candidate
>> Computer System Architecture
>> Peking University, China
>>
>
>
>
> --
> Best,
> Zubair
>
>
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