Capturing Packets

[scharan]

Hi,

I need to capture each packet arriving at each node in the network (in order
to calculate a hash on the *whole* packet, not just its header). Another way
to ask this is that I need to sniff the packet as it arrives at each node
and save/dump it to a file. Is this possible in NS2? If yes, how?

- scharan.

[scharan]

Hi,

I need to capture each packet arriving at each node in the network (in order
to calculate a hash on the whole packet, not just its header). Another way
to ask this is that I need to sniff the packet as it arrives at each node
and save/dump it to a file. Is this possible in NS2? If yes, how?

- scharan.

[Mubashir Rehmani]

Hi Sri Charan,

Yes it is possible. You need to work in the recv() packet function and dump
the contents of all the packet in the trace file.

Regards

Mubashir Husain Rehmani
ASAP/INRIA and LIP6, UPMC
www-rp.lip6.fr/~rehmani <http://www-rp.lip6.fr/%7Erehmani>
http://www.irisa.fr/asap/Members/mrehmani/Mubashir


2009/3/2 Sri Charan <scharan20@...>

>
> Hi,
>
> I need to capture each packet arriving at each node in the network (in
> order
> to calculate a hash on the *whole* packet, not just its header). Another
> way
> to ask this is that I need to sniff the packet as it arrives at each node
> and save/dump it to a file. Is this possible in NS2? If yes, how?
>
> - scharan.
>

--
Mubashir Husain Rehmani

[scharan]

Thanks!
I have the following clarification:

Do I have to reimplement recv() function for each protocol that I need to capture the packets for? Can u provide some examples or links to some examples on how this should be done?

- scharan.

Mubashir Rehmani wrote:

Hi Sri Charan,

Yes it is possible. You need to work in the recv() packet function and dump
the contents of all the packet in the trace file.

Regards

Mubashir Husain Rehmani
ASAP/INRIA and LIP6, UPMC
www-rp.lip6.fr/~rehmani <http://www-rp.lip6.fr/%7Erehmani>
http://www.irisa.fr/asap/Members/mrehmani/Mubashir


2009/3/2 Sri Charan <[e-mail]>

>
> Hi,
>
> I need to capture each packet arriving at each node in the network (in
> order
> to calculate a hash on the *whole* packet, not just its header). Another
> way
> to ask this is that I need to sniff the packet as it arrives at each node
> and save/dump it to a file. Is this possible in NS2? If yes, how?
>
> - scharan.
>



--
Mubashir Husain Rehmani

[Mubashir Rehmani]

Hi Scharan

You just need to modify the recv function of each protocol that you need to
capture the packets for.

You need to declare a header file
#include<fstream.h>

ofstream DRN("abc.tr"); //your output file

Then in the recv() function, you will just do this:

struct hdr aodv reply * rp = HDR_AODV_REPLY(p); //declare the header

DRN<<rp->rp_dst <<endl; //it will print the header in the output file (
abc.tr). In this way, you will dump all the contents of the packet that you
have captured or dropped.

Regards
Mubashir Husain Rehmani

2009/3/2 scharan <scharan20@...>

>
>
> Thanks!
> I have the following clarification:
>
> Do I have to reimplement recv() function for each protocol that I need to
> capture the packets for? Can u provide some examples or links to some
> examples on how this should be done?
>
> - scharan.
>
>
> Mubashir Rehmani wrote:
> >
> >
> > Hi Sri Charan,
> >
> > Yes it is possible. You need to work in the recv() packet function and
> > dump
> > the contents of all the packet in the trace file.
> >
> > Regards
> >
> > Mubashir Husain Rehmani
> > ASAP/INRIA and LIP6, UPMC
> > www-rp.lip6.fr/~rehmani <http://www-rp.lip6.fr/%7Erehmani> <
> http://www-rp.lip6.fr/%7Erehmani>
> > http://www.irisa.fr/asap/Members/mrehmani/Mubashir
> >
> >
> > 2009/3/2 Sri Charan <scharan20@...>
> >
> >>
> >> Hi,
> >>
> >> I need to capture each packet arriving at each node in the network (in
> >> order
> >> to calculate a hash on the *whole* packet, not just its header). Another
> >> way
> >> to ask this is that I need to sniff the packet as it arrives at each
> node
> >> and save/dump it to a file. Is this possible in NS2? If yes, how?
> >>
> >> - scharan.
> >>
> >
> >
> >
> > --
> > Mubashir Husain Rehmani
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Capturing-Packets-tp22281401p22283043.html
> Sent from the ns-users mailing list archive at Nabble.com.
>
>

--
Mubashir Husain Rehmani

[scharan]

Thanks again!

But is there no way to dump the entire packet, instead of first the header and then the payload etc?

Mubashir Rehmani wrote:

Hi Scharan

You just need to modify the recv function of each protocol that you need to
capture the packets for.

You need to declare a header file
#include<fstream.h>

ofstream DRN("abc.tr"); //your output file

Then in the recv() function, you will just do this:

struct hdr aodv reply * rp = HDR_AODV_REPLY(p); //declare the header

DRN<<rp->rp_dst <<endl; //it will print the header in the output file (
abc.tr). In this way, you will dump all the contents of the packet that you
have captured or dropped.

Regards
Mubashir Husain Rehmani

2009/3/2 scharan <[e-mail]>

>
>
> Thanks!
> I have the following clarification:
>
> Do I have to reimplement recv() function for each protocol that I need to
> capture the packets for? Can u provide some examples or links to some
> examples on how this should be done?
>
> - scharan.
>
>
> Mubashir Rehmani wrote:
> >
> >
> > Hi Sri Charan,
> >
> > Yes it is possible. You need to work in the recv() packet function and
> > dump
> > the contents of all the packet in the trace file.
> >
> > Regards
> >
> > Mubashir Husain Rehmani
> > ASAP/INRIA and LIP6, UPMC
> > www-rp.lip6.fr/~rehmani <http://www-rp.lip6.fr/%7Erehmani> <
> http://www-rp.lip6.fr/%7Erehmani>
> > http://www.irisa.fr/asap/Members/mrehmani/Mubashir
> >
> >
> > 2009/3/2 Sri Charan <[e-mail]>
> >
> >>
> >> Hi,
> >>
> >> I need to capture each packet arriving at each node in the network (in
> >> order
> >> to calculate a hash on the *whole* packet, not just its header). Another
> >> way
> >> to ask this is that I need to sniff the packet as it arrives at each
> node
> >> and save/dump it to a file. Is this possible in NS2? If yes, how?
> >>
> >> - scharan.
> >>
> >
> >
> >
> > --
> > Mubashir Husain Rehmani
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Capturing-Packets-tp22281401p22283043.html
> Sent from the ns-users mailing list archive at Nabble.com.
>
>


--
Mubashir Husain Rehmani