Hello Ariel,
Apparently, telnetd _DOES_ set the REMOTEHOST variable.
It appears that my login program does the same thing. Did anyone check his
login? In addition to this, telnetd passes on the address of its client via
login's -h argument and enables the -p argument, which orders login to prese
On Mon, 12 Mar 2001, Yotam Rubin wrote:
That is not my understanding of the protocol. Not too long ago, it was
possible to pass via the telnet client a variable that would point towards
a certain shared library (hacked), and the telnetd actually used it, and
enabled to gain remote elevated privi
Hello Yaron,
Telnet does no such thing, it merely execs some arbitrary program, which in
our case is login. True, telnetd passes on to login the value of the remote
host name but it does not set the environment variable independently.
Regards, Yotam Rubin
On Sun, Mar 11, 2001 at 09:04
On Sun, 11 Mar 2001, Boaz Rymland wrote:
> Besides, AFAIK, enviroment variables are all shell dependant as they
> are created by the shell. Some might be completely standard, like
> TERM, but they are all to the mercy of the shell. (Ofcourse, I would
> love to be corrected or better rephrased :-)
Hello Boaz,
Are you implying that environment variables cannot be created by a program
other than a shell? Environment variables are not shell specific.
Sure, shells usually set common variables, but in no way is the
environment shell dependent, just man 7 environ.
As for the REMOTEHOST issue,
Yotam Rubin wrote:
>
> Hello,
>
> The environment variable $REMOTEHOST is not shell Dependant.
> This variable is added by the program 'login'. The shell should not even
> know that it's being ran remotely. A sane telnetd should fork login, so
> you can rely on the $REMOTEHOST variable to exist.
Hello,
The environment variable $REMOTEHOST is not shell Dependant.
This variable is added by the program 'login'. The shell should not even
know that it's being ran remotely. A sane telnetd should fork login, so
you can rely on the $REMOTEHOST variable to exist.
Regards, Yotam Rubin
O
