[uml-devel] Connecting UML_SWITCH and Wireshark

[uml-devel] Connecting UML_SWITCH and Wireshark

[Julien Iguchi-Cartigny]

[-- Attachment #1: Type: text/plain, Size: 772 bytes --]

Hello,

(seems a developper question, apologies if it's more a user (moron)
question)

I'm using Netkit (www.netkit.org): it's a network simulator using UML
and I want to show packets exchanged between the UML machines. I believe
the best way is to

- use wireshark with the flag "-" to capture packets in the standard input.
- use netcat to read the data socket of uml_switch and print to the
standard output

But uml_switch uses a ctl socket to open new port. I need a way to
manually open a port by uml_switch to connect netcat. I don't think
uml_switch offer command-line instruction for this, so is the best way
to write a short program writing on the ctl socket of uml_switch ? If
yes, what data to send to uml_switch ?

Cheers,

Julien.


-- 
Trouble-a-cat Limited

[-- Attachment #2: julien_cartigny.vcf --]
[-- Type: text/x-vcard, Size: 414 bytes --]

begin:vcard
fn:Julien Iguchi-Cartigny
n:Iguchi-Cartigny;Julien
org;quoted-printable;quoted-printable:Universit=C3=A9 de Limoges;D=C3=A9partement DMI
adr;quoted-printable:83, rue d'Isle;;Site Jid=C3=A9;Limoges;;87000;France
email;internet:julien.cartigny@unilim.fr
title:Assistant Professor
tel;work:+33555436930
tel;cell:+33681606483
x-mozilla-html:FALSE
url:http://msi.unilim.fr/~cartigny/
version:2.1
end:vcard


[-- Attachment #3: Type: text/plain, Size: 363 bytes --]

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/

[-- Attachment #4: Type: text/plain, Size: 194 bytes --]

_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Connecting UML_SWITCH and Wireshark

[vincent-perrier]

Hello
I made another network simulator (clownix.net) and I just run
wireshark inside the uml machines, I do not see why you have 
troubles to see ip frames.




Le lundi 01 septembre 2008 à 17:44 +0200, Julien Iguchi-Cartigny a
écrit :
> Hello,
> 
> (seems a developper question, apologies if it's more a user (moron)
> question)
> 
> I'm using Netkit (www.netkit.org): it's a network simulator using UML
> and I want to show packets exchanged between the UML machines. I believe
> the best way is to
> 
> - use wireshark with the flag "-" to capture packets in the standard input.
> - use netcat to read the data socket of uml_switch and print to the
> standard output
> 
> But uml_switch uses a ctl socket to open new port. I need a way to
> manually open a port by uml_switch to connect netcat. I don't think
> uml_switch offer command-line instruction for this, so is the best way
> to write a short program writing on the ctl socket of uml_switch ? If
> yes, what data to send to uml_switch ?
> 
> Cheers,
> 
> Julien.
> 
> 
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel


-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Connecting UML_SWITCH and Wireshark

[Julien Iguchi-Cartigny]

[-- Attachment #1: Type: text/plain, Size: 2080 bytes --]

Hello Vincent,

Netkit doesn't support X, and I don't want it anyway, as the user has
already several terminals on his screen (one by UML machine).

I want Wireshark to be running on the host computer, and I don't want to
use the TAP solution (students using the simulator don't have root access).

So, the only way is to connect wireshark on uml_switch (how ?).

Cheers,

Julien.

vincent-perrier wrote:
> Hello
> I made another network simulator (clownix.net) and I just run
> wireshark inside the uml machines, I do not see why you have 
> troubles to see ip frames.
> 
> 
> 
> 
> Le lundi 01 septembre 2008 à 17:44 +0200, Julien Iguchi-Cartigny a
> écrit :
>> Hello,
>>
>> (seems a developper question, apologies if it's more a user (moron)
>> question)
>>
>> I'm using Netkit (www.netkit.org): it's a network simulator using UML
>> and I want to show packets exchanged between the UML machines. I believe
>> the best way is to
>>
>> - use wireshark with the flag "-" to capture packets in the standard input.
>> - use netcat to read the data socket of uml_switch and print to the
>> standard output
>>
>> But uml_switch uses a ctl socket to open new port. I need a way to
>> manually open a port by uml_switch to connect netcat. I don't think
>> uml_switch offer command-line instruction for this, so is the best way
>> to write a short program writing on the ctl socket of uml_switch ? If
>> yes, what data to send to uml_switch ?
>>
>> Cheers,
>>
>> Julien.
>>
>>
>> -------------------------------------------------------------------------
>> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
>> Build the coolest Linux based applications with Moblin SDK & win great prizes
>> Grand prize is a trip for two to an Open Source event anywhere in the world
>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
> 


-- 
Trouble-a-cat Limited

[-- Attachment #2: julien_cartigny.vcf --]
[-- Type: text/x-vcard, Size: 428 bytes --]

begin:vcard
fn:Julien Iguchi-Cartigny
n:Iguchi-Cartigny;Julien
org;quoted-printable;quoted-printable:Universit=C3=A9 de Limoges;D=C3=A9partement DMI
adr;quoted-printable:83, rue d'Isle;;Site Jid=C3=A9;Limoges;;87000;France
email;internet:julien.cartigny@unilim.fr
title:Assistant Professor
tel;work:+33555436930
tel;cell:+33681606483
x-mozilla-html:FALSE
url:http://msi.unilim.fr/~cartigny/
version:2.1
end:vcard


[-- Attachment #3: Type: text/plain, Size: 363 bytes --]

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/

[-- Attachment #4: Type: text/plain, Size: 194 bytes --]

_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Connecting UML_SWITCH and Wireshark

[Luca Bigliardi]

On Tue, Sep 02, 2008 at 10:39 AM, Julien Iguchi-Cartigny wrote:

Hi Julien,

> >> - use wireshark with the flag "-" to capture packets in the standard input.
> >> - use netcat to read the data socket of uml_switch and print to the
> >> standard output

On wireshark(1) they say this works only if you have a libpcap format on
wireshark's STDIN, but in this way you'll have pure ethernet frames.

Does Netkit support uml's vde network?
If it does then you can use the 'pdump' plugin in vde_switch which dumps
all the traffic in pcap format.

Here you can find an example of pdump usage:
http://qemu-forum.ipi.fi/viewtopic.php?f=2&p=13488#p13488


HTH

luca

-- 
Beware of programmers who carry screwdrivers.
                        -- Leonard Brandwein

http://shammash.homelinux.org/ - http://www.artha.org/ - http://www.yue.it/

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Connecting UML_SWITCH and Wireshark

[Julien Iguchi-Cartigny]

[-- Attachment #1: Type: text/plain, Size: 1134 bytes --]

Hello Luca,

> On wireshark(1) they say this works only if you have a libpcap format on
> wireshark's STDIN, but in this way you'll have pure ethernet frames.

Damn it ! I didn't think of this problem.

> Does Netkit support uml's vde network?
> If it does then you can use the 'pdump' plugin in vde_switch which dumps
> all the traffic in pcap format.

I don't think so (I didn't see reference to vde_switch in netkit
distribution).

One idea is to do the same think: use pdump on uml_switch (vde_switch
seems close to uml_switch, right ?).

An other idea  could be to extend uml_switch to dump traffic on standard
output in cap format. Don't seem too difficult (include libcap is
needed, and some code of course).

The only problem is how to connect the standard input of wireshark and
the standard output of this "new" uml_switch; netcat is an interesting
"brut hack" to do this (not really "elegant") but maybe some people have
a better solution ????

Cheers,

Julien.

> Here you can find an example of pdump usage:
> http://qemu-forum.ipi.fi/viewtopic.php?f=2&p=13488#p13488
> 
> 
> HTH
> 
> luca
> 


-- 
Trouble-a-cat Limited

[-- Attachment #2: julien_cartigny.vcf --]
[-- Type: text/x-vcard, Size: 414 bytes --]

begin:vcard
fn:Julien Iguchi-Cartigny
n:Iguchi-Cartigny;Julien
org;quoted-printable;quoted-printable:Universit=C3=A9 de Limoges;D=C3=A9partement DMI
adr;quoted-printable:83, rue d'Isle;;Site Jid=C3=A9;Limoges;;87000;France
email;internet:julien.cartigny@unilim.fr
title:Assistant Professor
tel;work:+33555436930
tel;cell:+33681606483
x-mozilla-html:FALSE
url:http://msi.unilim.fr/~cartigny/
version:2.1
end:vcard


[-- Attachment #3: Type: text/plain, Size: 363 bytes --]

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/

[-- Attachment #4: Type: text/plain, Size: 194 bytes --]

_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Connecting UML_SWITCH and Wireshark

[vincent-perrier]

Hello Julien
I find Xorg/gtk very very usefull! even if I too work only in
terminals with command-line interfaces.
As I plan to have sip softphones in my next uml machines, I have to
have all the necessary gui (including a java machine).
But if you really want to spy ip packets without gtk, use tshark,
it is also a fantastic piece of software.
Cheers
Vincent Perrier

Le mardi 02 septembre 2008 à 10:39 +0200, Julien Iguchi-Cartigny a
écrit :
> Hello Vincent,
> 
> Netkit doesn't support X, and I don't want it anyway, as the user has
> already several terminals on his screen (one by UML machine).
> 
> I want Wireshark to be running on the host computer, and I don't want to
> use the TAP solution (students using the simulator don't have root access).
> 
> So, the only way is to connect wireshark on uml_switch (how ?).
> 
> Cheers,
> 
> Julien.
> 
> vincent-perrier wrote:
> > Hello
> > I made another network simulator (clownix.net) and I just run
> > wireshark inside the uml machines, I do not see why you have 
> > troubles to see ip frames.
> > 
> > 
> > 
> > 
> > Le lundi 01 septembre 2008 à 17:44 +0200, Julien Iguchi-Cartigny a
> > écrit :
> >> Hello,
> >>
> >> (seems a developper question, apologies if it's more a user (moron)
> >> question)
> >>
> >> I'm using Netkit (www.netkit.org): it's a network simulator using UML
> >> and I want to show packets exchanged between the UML machines. I believe
> >> the best way is to
> >>
> >> - use wireshark with the flag "-" to capture packets in the standard input.
> >> - use netcat to read the data socket of uml_switch and print to the
> >> standard output
> >>
> >> But uml_switch uses a ctl socket to open new port. I need a way to
> >> manually open a port by uml_switch to connect netcat. I don't think
> >> uml_switch offer command-line instruction for this, so is the best way
> >> to write a short program writing on the ctl socket of uml_switch ? If
> >> yes, what data to send to uml_switch ?
> >>
> >> Cheers,
> >>
> >> Julien.
> >>
> >>
> >> -------------------------------------------------------------------------
> >> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> >> Build the coolest Linux based applications with Moblin SDK & win great prizes
> >> Grand prize is a trip for two to an Open Source event anywhere in the world
> >> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> >> _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
> > 
> 
> 


-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Connecting UML_SWITCH and Wireshark

[Jeff Dike]

On Mon, Sep 01, 2008 at 05:44:39PM +0200, Julien Iguchi-Cartigny wrote:
> I'm using Netkit (www.netkit.org): it's a network simulator using UML
> and I want to show packets exchanged between the UML machines. I believe
> the best way is to
> 
> - use wireshark with the flag "-" to capture packets in the standard input.
> - use netcat to read the data socket of uml_switch and print to the
> standard output
> 
> But uml_switch uses a ctl socket to open new port. I need a way to
> manually open a port by uml_switch to connect netcat. I don't think
> uml_switch offer command-line instruction for this, so is the best way
> to write a short program writing on the ctl socket of uml_switch ? If
> yes, what data to send to uml_switch ?

If you want to capture UML network traffic going over uml_switch (be
it with wireshark or tcpdump - it doesn't matter), there are two basic
ways of doing it:
	enable hub mode (uml_switch -hub) and then either

	sniff from a UML's eth0 (a third UML if you don't want to
interfere with the communicating UMLs), or
	add a host tap device to the switch (uml_switch -tap tap<n>)
and sniff that.

				Jeff

-- 
Work email - jdike at linux dot intel dot com

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Connecting UML_SWITCH and Wireshark

[Julien Iguchi-Cartigny]

[-- Attachment #1: Type: text/plain, Size: 1726 bytes --]

Hello Jeff,

Both solutions don't satisfy my needs.

- My UML machines run only in terminal mode (no X)
- I don't want to use mechanisms which require root rights.

I've investigated the code of uml_switch and I think a slight
modification can offer a user-level sniff for UML: add a new request
type (uml_switch.c) and create a simple program which connect to the
uml_switch and just dump (in raw or libpcap format) in standard input
the traffic.

I don't think it requires a lot of works...

Julien.

Jeff Dike wrote:
> On Mon, Sep 01, 2008 at 05:44:39PM +0200, Julien Iguchi-Cartigny wrote:
>> I'm using Netkit (www.netkit.org): it's a network simulator using UML
>> and I want to show packets exchanged between the UML machines. I believe
>> the best way is to
>>
>> - use wireshark with the flag "-" to capture packets in the standard input.
>> - use netcat to read the data socket of uml_switch and print to the
>> standard output
>>
>> But uml_switch uses a ctl socket to open new port. I need a way to
>> manually open a port by uml_switch to connect netcat. I don't think
>> uml_switch offer command-line instruction for this, so is the best way
>> to write a short program writing on the ctl socket of uml_switch ? If
>> yes, what data to send to uml_switch ?
> 
> If you want to capture UML network traffic going over uml_switch (be
> it with wireshark or tcpdump - it doesn't matter), there are two basic
> ways of doing it:
> 	enable hub mode (uml_switch -hub) and then either
> 
> 	sniff from a UML's eth0 (a third UML if you don't want to
> interfere with the communicating UMLs), or
> 	add a host tap device to the switch (uml_switch -tap tap<n>)
> and sniff that.
> 
> 				Jeff
> 


-- 
Trouble-a-cat Limited

[-- Attachment #2: julien_cartigny.vcf --]
[-- Type: text/x-vcard, Size: 414 bytes --]

begin:vcard
fn:Julien Iguchi-Cartigny
n:Iguchi-Cartigny;Julien
org;quoted-printable;quoted-printable:Universit=C3=A9 de Limoges;D=C3=A9partement DMI
adr;quoted-printable:83, rue d'Isle;;Site Jid=C3=A9;Limoges;;87000;France
email;internet:julien.cartigny@unilim.fr
title:Assistant Professor
tel;work:+33555436930
tel;cell:+33681606483
x-mozilla-html:FALSE
url:http://msi.unilim.fr/~cartigny/
version:2.1
end:vcard


[-- Attachment #3: Type: text/plain, Size: 363 bytes --]

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/

[-- Attachment #4: Type: text/plain, Size: 194 bytes --]

_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel