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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