Very Computer

by **Karel.DeBruy** » Thu, 27 Mar 1997 04:00:00

Hi,

I want to find out the complete hostname from a last entry.
the last command gives me :

dbruyne pts/15 pcrokb1.rekc.uia Mon Mar 24 11:45 - 12:28 (00:43)

the hostname is pcrokb1.rekc.uia.ac.be

Karel
--
=======================================================================
Karel De Bruyne
System/Network Manager phone + 32 3 820 22 04
UIA - Computer Centre fax + 32 3 820 22 49

by **Shawn Laemmri** » Thu, 27 Mar 1997 04:00:00

: Hi,
:
: I want to find out the complete hostname from a last entry.
: the last command gives me :
:
: dbruyne pts/15 pcrokb1.rekc.uia Mon Mar 24 11:45 - 12:28 (00:43)
:
: the hostname is pcrokb1.rekc.uia.ac.be
:

The problem is the field in the structure is fixed length... I'm not sure
what it is off hand, but your host name is probibly longer than the
machine name part of the struct allows (for it to be fully displayed).

Shawn
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by **Casper H.S. Dik - Network Security Engine** » Fri, 28 Mar 1997 04:00:00

}:
}: I want to find out the complete hostname from a last entry.
}: the last command gives me :
}:
}: dbruyne pts/15 pcrokb1.rekc.uia Mon Mar 24 11:45 - 12:28 (00:43)
}:
}: the hostname is pcrokb1.rekc.uia.ac.be
}:
}The problem is the field in the structure is fixed length... I'm not sure
}what it is off hand, but your host name is probibly longer than the
}machine name part of the struct allows (for it to be fully displayed).

wtmpx stores a wopping total of 256 bytes of the remote hostname; last will
only show a few because it formats nicer.

So the information is there, it just won't show.

Casper
--
Expressed in this posting are my opinions. They are in no way related
to opinions held by my employer, Sun Microsystems.
Statements on Sun products included here are not gospel and may
be fiction rather than truth.

by **Japhy Ryd** » Fri, 28 Mar 1997 04:00:00

:
: wtmpx stores a wopping total of 256 bytes of the remote hostname; last will
: only show a few because it formats nicer.
:
:
: So the information is there, it just won't show.
:

yep. its not too hard to write your own modified last command to do this
if you want either.

basically just check out the source from freebsd/netbsd whatever, to get
a general idea of whats going on, and go from there.

by **Cameron Lai** » Sat, 29 Mar 1997 04:00:00

>:
>: wtmpx stores a wopping total of 256 bytes of the remote hostname; last will
>: only show a few because it formats nicer.
>:
>:
>: So the information is there, it just won't show.
>:

>yep. its not too hard to write your own modified last command to do this
>if you want either.

>basically just check out the source from freebsd/netbsd whatever, to get
>a general idea of whats going on, and go from there.

I'm not so sure. I had written the same to Mr. DeBruyne,
but he quite correctly pointed out that the information
is *not* there, at least not as you and I first said.

Here's what I know: essentially all Unixes offer a `man
utmp`. For BSD-derived flavors, /usr/include/utmp.h
typically includes in the definition for utmp a ut_host
field; this is NOT present, however, in SysVish Unixes,
including Solaris, in particular (and Mr. DeBruyne did
post his appeal to c.u.s). Even for BSD, by the way,
it's stickier than might first appear, for, in the words
of one man page at hand,

When they log out, init(8) clears that entry
by setting ut_name and ut_host to null strings
...

The key to this, as so often is the case in c.u.s, is to
read what Mr. Dik has written carefully. He mentioned
utmpx(4). There, eXtended utmp information, including
ut_host, is indeed available.

I'm rushed now, but perhaps over the weekend I'll post a
small example program.
--

Cameron Laird http://starbase.neosoft.com/~claird/home.html

+1 713 996 8546 FAX

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full hostname in last

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