[ndnSIM] Adding new field to Interest packet

[Mateus Sousa]

I fixed the error by imitating the Nonce field and it works.

Thank you very much for your time and patience.

2017-10-16 23:29 GMT-03:00 Spyridon (Spyros) Mastorakis <
mastorakis at cs.ucla.edu>:

> Hi,
>
> I would suggest that you add the new field as an NDNLP tag instead:
>
> https://lo.calho.st/networks/adding-custom-packet-fields-
> to-packets-in-ndnsim-2-3-without-forking-the-entire-repository/
>
> Thanks,
>
> Spyridon (Spyros) Mastorakis
> Personal Website: http://cs.ucla.edu/~mastorakis/
> Internet Research Laboratory
> Computer Science Department
> UCLA
>
> On Oct 16, 2017, at 4:44 AM, Mateus Sousa <mateus.aluufc at gmail.com> wrote:
>
> *wireDEcode (before nonce): *
>
>   ////////////////////////////////////////
>   // Mateus UFBA-Brazil-2017
>   ////////////////////////////////////////
>   // NextForwarder
>   m_nextForwarder = m_wire.get(tlv::NextForwarder);
>   m_lastForwarder = m_wire.get(tlv::LastForwarder);
>
>   ////////////////////////////////////////
>   //          END MATEUS
>   ////////////////////////////////////////
>
>
>
> *wireEncode:*  //////////////////////////////////////////////////
>   // My modifications (Mateus)
>   //////////////////////////////////////////////////
>   getNextForwarder();
>   getLastForwarder();
>   totalLength += encoder.prependBlock(m_lastForwarder);
>   totalLength += encoder.prependBlock(m_nextForwarder);
>   //////////////////////////////////////////////////
>
> I tried to copy the Nonce settings.
>
> Thanks,
>
>
>
>
> 2017-10-15 23:21 GMT-03:00 Spyridon (Spyros) Mastorakis <
> mastorakis at cs.ucla.edu>:
>
>> Hi,
>>
>> have you modified the wireEncode and wireDecode methods to encode/decode
>> the field to/from wire format?
>>
>> Thanks,
>>
>> Spyridon (Spyros) Mastorakis
>> Personal Website: http://cs.ucla.edu/~mastorakis/
>> Internet Research Laboratory
>> Computer Science Department
>> UCLA
>>
>> On Oct 15, 2017, at 4:28 PM, Mateus Sousa <mateus.aluufc at gmail.com>
>> wrote:
>>
>> Hi all,
>>
>> I added a new field to Interest packet by following the discussions:
>> http://www.lists.cs.ucla.edu/pipermail/ndnsim/2015-July/002044.html and
>> http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-March/003481.html.
>>
>> I created the field "NextForwarder" to point what node is the next
>> forwarder to the interest. This field should be updated at every node (here
>> is the problem).
>>
>> However, the alterations aren't persistent. The field value turns into
>> "0" no matter what value I set.
>>
>> Here goes my modifications:
>>
>> *    src/Interest.cpp: *
>>
>>     Interest&
>>     Interest::setNextForwarder(uint32_t next) {
>>            if (m_wire.hasWire() && m_nextForwarder.value_size() ==
>> sizeof(uint32_t)) {
>>             std::memcpy(const_cast<uint8_t*>(m_nextForwarder.value()),
>> &next, sizeof(next));
>>   }
>>   else {
>>     m_nextForwarder = makeBinaryBlock(tlv::NextForwarder,
>>                               reinterpret_cast<const uint8_t*>(&next),
>>                               sizeof(next));
>>     m_wire.reset();
>>   }
>>   return *this;
>> }
>>
>> uint32_t
>> Interest::getNextForwarder() const{
>>   if (!m_nextForwarder.hasWire())
>>     const_cast<Interest*>(this)->setNextForwarder(9999);
>>
>>   if (m_nextForwarder.value_size() == sizeof(uint32_t))
>>     return *reinterpret_cast<const uint32_t*>(m_nextForwarder.value());
>>   else {
>>     return readNonNegativeInteger(m_nextForwarder);
>>   }
>> }
>>
>>
>> *    encoding/tlv.h*
>>           NextForwarder = 33, // X- Mateus
>>
>>
>> Thanks in advance.
>>
>>
>>
>
>
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