topic Re: script doesn't work using port 23 in inetd.conf in Operating System - Linux

script doesn't work using port 23 in inetd.conf

yc_2 — Wed, 19 Sep 2001 12:09:44 GMT

Hi,

I have written an expect script using service port number 5000, it works fine.

The final goal of the script is to use port 23. After I changed the script's service port number to 23 and did a refresh of inetd. The telnet client will not be able to connect to the server, it just hang with a blank screen.

Any pointer is appreciated.

YC

Re: script doesn't work using port 23 in inetd.conf

Patrick Preuss — Wed, 19 Sep 2001 13:45:25 GMT

Hi,
have you set the entrie in the inetd.conf in this way
telnet stream tcp nowait /usr/sbin/tcpd /path/to/my/script
so the tcp warper is used?

have you set the screen size and the TERM type so that expect can determine it?

best regards
Patrick

Re: script doesn't work using port 23 in inetd.conf

yc_2 — Thu, 20 Sep 2001 00:16:57 GMT

Hi,

The script had been tested using service port 5000 and worked fine.

When I tried it using port 23, I actually inter-change port 5000 and 23. A freshed of inetd was also performed.

Rgds,
YC

Re: script doesn't work using port 23 in inetd.conf

Patrick Preuss — Thu, 20 Sep 2001 13:57:04 GMT

Have you disabled telnetd on port 23? i'm useing an dump script on port 23 that does nothing and it works fine!-)

hope it helps a bit

Re: script doesn't work using port 23 in inetd.conf

yc_2 — Fri, 21 Sep 2001 00:00:06 GMT

Hi,

Appreciate if your advice on how to disable telnetd.

I thought the way I did will swop the telnetd port to 5000.

YC

Re: script doesn't work using port 23 in inetd.conf

yc_2 — Fri, 21 Sep 2001 00:00:31 GMT

Hi,

Appreciate if you can advice on how to disable telnetd.

I thought the way I did will swop the telnetd port to 5000.

YC

Re: script doesn't work using port 23 in inetd.conf

yc_2 — Fri, 21 Sep 2001 08:12:08 GMT

Hi,

I've found out why the script doesn't work when I changed its port number to 23 and telnet port to 5000. This is because within my script, it telnet to another host. When the telnet port changed to 5000, then the telent within the script will not work.

Is there a work around ?

YC

Re: script doesn't work using port 23 in inetd.conf

Patrick Preuss — Fri, 21 Sep 2001 08:45:50 GMT

For understanding
1) you have written a script witch should answer on Port 23 on host

2) in this script you want to telnet on port 23 to host and wnt to telnet to host

3) Your telnetd should listen on port 5000 on host

so i whould enter in the inetd.conf on host
----snip----
# For my script because it runs on the telnet port 23
telnet stream tcp nowait root /usr/sbin/tcpd /root/foo.sh
# For the real telnetd to listen on port 5000
mytelnet stream tcp nowait root /usr/sbin/tcpd in.telnetd
---snip----
at next you add following to your /etc/services
---snip---
# so you assine the nummber to a name
mytelnet 5000/tcp
---snip---
no you should change the call of telnet to host to telnet mytelnet and you should get your normal telnet promt.

hope this helps a bit

- Patrick

Re: script doesn't work using port 23 in inetd.conf

Manoj Kumar Sarangi — Thu, 15 Nov 2001 05:09:14 GMT

Hi
Within the script use the port no along with telnet

telnet host portno.
e.g.;

telnet 153.11.199.32 23

This should work ..

Manoj