Cool. I'm just waiting for the green light from Luis and Adriano and then
I'll move ahead and change the common protobuf.
On Sun, Sep 23, 2012 at 9:53 AM, Zhongjie Wang <wzj...@gmail.com> wrote:
> I think so. It's enough to deal with the current censorship with all kinds
> of DNS injection. If there's any problems in the future, then we can fix it
> later.
>
> 在 2012-9-23 上午12:14，"Zubair Nabi" <zn.zubairn...@gmail.com>写道：
>
> Thanks. But do you think this is the best mechanism to catch such sort of
>> censorship?
>>
>> On Sat, Sep 22, 2012 at 8:23 PM, Zhongjie Wang <wzj...@gmail.com> wrote:
>>
>>> 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
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> ------------------------------------------------------------------------------
>>>>>>>> Everyone hates slow websites. So do we.
>>>>>>>> Make your web apps faster with AppDynamics
>>>>>>>> Download AppDynamics Lite for free today:
>>>>>>>> http://ad.doubleclick.net/clk;258768047;13503038;j?
>>>>>>>> http://info.appdynamics.com/FreeJavaPerformanceDownload.html
>>>>>>>> _______________________________________________
>>>>>>>> Umit-devel mailing list
>>>>>>>> Umit-devel@lists.sourceforge.net
>>>>>>>> https://lists.sourceforge.net/lists/listinfo/umit-devel
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Zhongjie Wang
>>>>>>> Master Candidate
>>>>>>> Computer System Architecture
>>>>>>> Peking University, China
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Best,
>>>>>> Zubair
>>>>>>
>>>>>>
>>>>
>>>>
>>>> --
>>>> Best,
>>>> Zubair
>>>>
>>>>
>>>
>>>
>>> --
>>> Zhongjie Wang
>>> Master Candidate
>>> Computer System Architecture
>>> Peking University, China
>>>
>>
>>
>>
>> --
>> Best,
>> Zubair
>>
>>
--
Best,
Zubair
------------------------------------------------------------------------------
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Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
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http://info.appdynamics.com/FreeJavaPerformanceDownload.html
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