Nice work ;) I've learnt something new, I used to think only A records can
be retrieved.
On Sat, Sep 22, 2012 at 8:33 PM, Zubair Nabi <zn.zubairn...@gmail.com>wrote:
> There are various libraries available for every language which allow you
> to fetch the DNS record based on the hostname. For the Android agent I'm
> using DNSJava (http://www.xbill.org/dnsjava/). Sample code from the
> Android agent:
>
> https://github.com/umitproject/openmonitor-android-agent/blob/master/icm-mobile/src/org/umit/icm/mobile/connectivity/DNSLookup.java
>
> and how it is used for each website URL:
> Go to method setupDNSRecords()
> *
> https://github.com/umitproject/openmonitor-android-agent/blob/master/icm-mobile/src/org/umit/icm/mobile/connectivity/WebsiteDetails.java
> *
>
>
> On Sat, Sep 22, 2012 at 5:25 PM, Zhongjie Wang <wzj...@gmail.com> wrote:
>
>> 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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>>>>> Download AppDynamics Lite for free today:
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>>>>> _______________________________________________
>>>>> Umit-devel mailing list
>>>>> Umit-devel@lists.sourceforge.net
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Zhongjie Wang
>>>> Master Candidate
>>>> Computer System Architecture
>>>> Peking University, China
>>>>
>>>
>>>
>>>
>>> --
>>> Best,
>>> Zubair
>>>
>>>
>
>
> --
> Best,
> Zubair
>
>
--
Zhongjie Wang
Master Candidate
Computer System Architecture
Peking University, China
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