how to find mac address of a remote computer?

[Jay]

I need to write a program to find mac address of a remote computer, is
this possible? How?

 

[Mark A. Odell]

(e-mail address removed) (Jay) wrote in

I need to write a program to find mac address of a remote computer, is
this possible? How?

You cannot do this without platform-specific code which is off-topic here.
The C language does not provide networking support.

 

[David Rubin]

I need to write a program to find mac address of a remote computer, is
this possible? How?

arp?

/david

 

[Jirka Klaue]

I need to write a program to find mac address of a remote computer, is
this possible? How?

It is possible, but you don't need to write a program, since
there is http://www.tcpdump.org.

Jirka

 

[Jan Engelhardt]

I need to write a program to find mac address of a remote computer, is

this possible? How?

Ping between both computers and run "arp" on one side if you got Linux or
similar.

 

[Dan Pop]

Ping between both computers and run "arp" on one side if you got Linux or
similar.

And you'll get the MAC address of the router, if the machines are not on
the same subnet.

Dan

 

[Lew Pitcher]

I need to write a program to find mac address of a remote computer, is
this possible? How?

#include <stdio.h>

int main(void)
{
char mac_address[257];

printf("Enter the MAC address of the remote computer: ");
fflush(stdin);

fgets(mac_address,sizeof(mac_address), stdin);
if (mac_address[strlen(mac_address) - 1] == '\n')
mac_address[strlen(mac_address) - 1] = 0;

printf("The MAC address of the remote computer is %s\n",
mac_address);

return 0;
}



--
Lew Pitcher

Master Codewright and JOAT-in-training
Registered Linux User #112576 (http://counter.li.org/)
Slackware - Because I know what I'm doing.

 

[Joona I Palaste]

#include <stdio.h>

int main(void)
{
char mac_address[257];

printf("Enter the MAC address of the remote computer: ");
fflush(stdin);

^^^^^^^^^^^^^
Undefined behaviour. Because of this, the program might completely
fail to display the given MAC address.

fgets(mac_address,sizeof(mac_address), stdin);
if (mac_address[strlen(mac_address) - 1] == '\n')
mac_address[strlen(mac_address) - 1] = 0;

printf("The MAC address of the remote computer is %s\n",
mac_address);

return 0;
}

--
/-- Joona Palaste ([email protected]) ---------------------------\
| Kingpriest of "The Flying Lemon Tree" G++ FR FW+ M- #108 D+ ADA N+++|
| http://www.helsinki.fi/~palaste W++ B OP+ |
\----------------------------------------- Finland rules! ------------/
"Insanity is to be shared."
- Tailgunner

 

[Lew Pitcher]

^^^^^^^^^^^^^
Undefined behaviour. Because of this, the program might completely
fail to display the given MAC address.

Da*n, caught out by a typo. Of course, I meant
fflush(stdout);
but I transcribed it incorrectly.


--

Lew Pitcher, IT Consultant, Application Architecture
Enterprise Technology Solutions, TD Bank Financial Group

(Opinions expressed here are my own, not my employer's)

 

[PeterW]

Originally posted by Jay

I need to write a program to find mac address of a remote computer, is

this possible? How?

If you can run a remote shell on the machine, you can run ifconfig and
parse the result with grep from the standard output.

rsh remoteHost sbin/ifconfig | grep "^eth0"

eth0 Link encap:Ethernet HWaddr 00:0D:29:A8:80:44



You can use cut or awk to extract the MAC hardware address.

 

[Joona I Palaste]

Originally posted by Jay

If you can run a remote shell on the machine, you can run ifconfig and
parse the result with grep from the standard output.
eth0 Link encap:Ethernet HWaddr 00:0D:29:A8:80:44

You can use cut or awk to extract the MAC hardware address.

Which part of this had anything at all to do with C?

 

[Glen Herrmannsfeldt]

Which part of this had anything at all to do with C?

ifconfig, grep, cut, and awk are all C programs.

-- glen

 

[Joona I Palaste]

ifconfig, grep, cut, and awk are all C programs.

But this newsgroup is about C, not C programs.

 

[Mark McIntyre]

ifconfig, grep, cut, and awk are all C programs.

Says who? Maybe they're written in Fortran on the OP's platform.