topic get the IP address of the current telnet session with C function in Operating System - Linux

get the IP address of the current telnet session with C function

Joel Girot — Fri, 09 Sep 2005 05:24:53 GMT

Hi to all,
I would like to know if there is a way I can find out the IP address of my current telnet or ssh session with C functions. HPUX 11.11, untrusted system.

Thanks

Re: get the IP address of the current telnet session with C function

Simon Hargrave — Fri, 09 Sep 2005 05:35:24 GMT

This information is stored in the utmp file.

From the shell you can get this information with: -

who -mu (the last field is the hostname/ip address)

If you want to do this with C calls you'll have to use the getut calls.

man 3 getut

for more details.

Re: get the IP address of the current telnet session with C function

Joel Girot — Fri, 09 Sep 2005 11:35:39 GMT

Thanks Simon,
I will try and I will publish my result... after my holliday.

Joel

Re: get the IP address of the current telnet session with C function

Joel Girot — Mon, 03 Oct 2005 07:22:44 GMT

Hi

The code I included shows how I do this.
I am a beginner with c language, excuse me for possible mistake...

bye

Joel

Re: get the IP address of the current telnet session with C function

Muthukumar_5 — Mon, 03 Oct 2005 07:31:33 GMT

I have checked your code using HP92453-01 A.11.01.21 HP C (Bundled) Compiler.

Attached is working good.

hth.

Re: get the IP address of the current telnet session with C function

Arunvijai_4 — Mon, 03 Oct 2005 07:34:24 GMT

Great, Its working good (tested in 11.23)

device name : pts/tb
pid : 15458
type of entry : 7
Process termination status : 0
Process exit status : 3
seconds time entry was made : 1127917725
microseconds time entry was made : 0
my device name : pts/0

user login name : root
id : ts/0
device name : pts/0
pid : 12718
type of entry : 7
Process termination status : 0
Process exit status : 0
seconds time entry was made : 1128328306
microseconds time entry was made : 517252
............
............

-Arun

Re: get the IP address of the current telnet session with C function

A. Clay Stephenson — Mon, 03 Oct 2005 09:23:52 GMT

Actually a much easier and more reliable method makes use of the getpeername() system call. Man 2 getpeername for details.

Re: get the IP address of the current telnet session with C function

Joel Girot — Wed, 05 Oct 2005 05:32:38 GMT

Clay, have you an example of the use of getpeername ?

Joel

Re: get the IP address of the current telnet session with C function

Stephen Keane — Wed, 05 Oct 2005 06:34:05 GMT

getpeername uses the socket id of a connected socket. Which socket would that be then? Or can any connected socket do?