Connecting UML_SWITCH and Wireshark
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.
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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 :
Quoted 24 lines
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 ofuml_switchand print to the standard outputBut
uml_switchuses a ctl socket to open new port. I need a way to manually open a port byuml_switchto connect netcat. I don't thinkuml_switchoffer command-line instruction for this, so is the best way to write a short program writing on the ctl socket ofuml_switch? If yes, what data to send touml_switch?Cheers,
Julien.
Quoted 6 lines
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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.
Quoted 41 lines · 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 :
Quoted 30 lines
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 ofuml_switchand print to the standard outputBut
uml_switchuses a ctl socket to open new port. I need a way to manually open a port byuml_switchto connect netcat. I don't thinkuml_switchoffer command-line instruction for this, so is the best way to write a short program writing on the ctl socket ofuml_switch? If yes, what data to send touml_switch?Cheers,
Julien.
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On Tue, Sep 02, 2008 at 10:39 AM, Julien Iguchi-Cartigny wrote:
Hi Julien,
Quoted 3 lines
Quoted 3 lines
Quoted 3 lines
- use wireshark with the flag "-" to capture packets in the standard input.
- use netcat to read the data socket ofuml_switchand 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
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https://lists.sourceforge.net/lists/listinfo/user-mode-linux-develHello Luca,
Quoted 2 lines
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.
Quoted 3 lines
Does Netkit support uml's vde network?
If it does then you can use the 'pdump' plugin invde_switchwhich 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.
Quoted 8 lines
Here you can find an example of pdump usage:
http://qemu-forum.ipi.fi/viewtopic.php?f=2&p=13488#p13488HTH
luca
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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 :
Quoted 8 lines
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).
Quoted 50 lines
So, the only way is to connect wireshark on
uml_switch(how ?).Cheers,
Julien.
Quoted 41 lines · 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 :
Quoted 30 lines
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 ofuml_switchand print to the standard outputBut
uml_switchuses a ctl socket to open new port. I need a way to manually open a port byuml_switchto connect netcat. I don't thinkuml_switchoffer command-line instruction for this, so is the best way to write a short program writing on the ctl socket ofuml_switch? If yes, what data to send touml_switch?Cheers,
Julien.
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Quoted 8 lines · Julien Iguchi-Cartigny
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 ofuml_switchand print to the standard output
Quoted 5 lines
But
uml_switchuses a ctl socket to open new port. I need a way to manually open a port byuml_switchto connect netcat. I don't thinkuml_switchoffer command-line instruction for this, so is the best way to write a short program writing on the ctl socket ofuml_switch? If yes, what data to send touml_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
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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.
Quoted 27 lines · Jeff Dike
Quoted 8 lines · Julien Iguchi-Cartigny
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 ofuml_switchand print to the standard outputQuoted 5 lines
But
uml_switchuses a ctl socket to open new port. I need a way to manually open a port byuml_switchto connect netcat. I don't thinkuml_switchoffer command-line instruction for this, so is the best way to write a short program writing on the ctl socket ofuml_switch? If yes, what data to send touml_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 eithersniff 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
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