topic Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11 in Operating System - HP-UX

using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Belina Ang_1 — Fri, 21 Mar 2003 21:12:34 GMT

Does anyone have any idea why using the script below on HP-UX 11 works and not on HP-UX 11.11?

HOST=$1
ID=$2
PW=$3
telnet $HOST 2>&1 | tee /tmp/logfile |&
(sleep 1; print -p $ID)
(sleep 1; print -p $PW)
(sleep 1; print -p echo hello)
a="$(sleep 1; read -p | tr -d '\r')"
while [[ "$a" != *hello* ]] ;
do
print [$a]
a="$(sleep 1; read -p | tr -d '\r')"
done
print -p echo exit

Thanks in advance....

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Michael Steele_2 — Fri, 21 Mar 2003 22:00:56 GMT

Why don't you add debug lines? And see's how far it gets?

ksh: set -xv

sh: sh -x -v script

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Belina Ang_1 — Fri, 21 Mar 2003 22:03:20 GMT

Did that already as well as tusc, but was not able to see anything important except in the tusc file. On HP-UX 11.11, it seems to be using a select() instead of a sigtimedwait().

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Michael Steele_2 — Fri, 21 Mar 2003 22:04:00 GMT

You do have one of the following on the first line, right?

#!/usr/bin/ksh

#!/usr/bin/sh

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Ramkumar Devanathan — Mon, 24 Mar 2003 09:04:32 GMT

hi,

I've seen this problem with 11.11 machines. But somehow now I am not able to reproduce this on the same hp-ux 11.11 machine. Check if this is a problem with patches required.

In any case, I suggest you use something like remsh to do the above. or even expect scripts.

http://hpux.connect.org.uk/hppd/hpux/Tcl/expect-5.37/

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x2919237a4bc6d611abdb0090277a778c,00.html

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x9ec691ccb36bd611abdb0090277a778c,00.html

- ramd.

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Belina Ang_1 — Mon, 24 Mar 2003 14:27:48 GMT

Yes, there is a
!#/usr/bin/ksh -x
on the first line. I am more inclined to think that patches would solve the problem. I just have not found the correct one yet. If anyone remembers, would really appreciate it.

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Jeff Schussele — Mon, 24 Mar 2003 14:30:41 GMT

Hi Belina,

That first line HAS to be Sh-Bang - like

#!/usr/bin/ksh -x

NOT

!#/usr/bin/ksh -x

Was that just a typo in your last post?

Rgds,
Jeff

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Belina Ang_1 — Mon, 24 Mar 2003 14:32:35 GMT

Sorry, typo

it was a ....

#!/usr/bin/ksh

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Ramkumar Devanathan — Mon, 24 Mar 2003 14:51:28 GMT

Belina,

I don't know if this will help very much, but my ksh binary has this what string -

# what /usr/bin/ksh
/usr/bin/ksh:
$Revision: B.11.11_LR
Wed Nov 8 19:55:23 PST 2000 $
$ B.11.11_LR Oct 27 2000 00:40:10 $
Version 11/16/88

I ran the following script several times just now -
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
#!/usr/bin/ksh

cat /var/adm/syslog/syslog.log |&
while read -p line
do
echo $line
done
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

And it worked fine.

Probably you may try to increase some kernel parameters - max_thread_proc is 1024 on this machine.

- ramd.

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Steven E. Protter — Mon, 24 Mar 2003 15:04:28 GMT

First thing I'd do is check the PATH varable. All the commands you are using were migrated to 11.11 as far as I know. If its a new system, the /etc/profile might be different, causing different behavior.

SEP

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Belina Ang_1 — Mon, 24 Mar 2003 15:22:01 GMT

Hello Ramd,

=> what /usr/bin/ksh
/usr/bin/ksh:
$Revision: B.11.11_LR
Wed Nov 8 19:55:23 PST 2000 $
$ B.11.11_LR Oct 27 2000 00:40:10 $
Version 11/16/88

The script you wrote also worked on my 11.11

I have exactly the same results you got. I think I might be looking for a telnet patch since when I compared the tusc outputs between a 11 and 11.11. It started being different at the point when the password is about to be entered. I was ablt to enter the login name, but when it prompted for the password, I was getting the following:

Password: Local flow control on
Connection closed by foreign host.

19174: select(2048, 0x40005860, 0x40005760, 0x40005660, NULL) = 1
19174: recv(4, 0x400064f8, 1024, 0) = 0
19174: ioctl(0, TCSETATTRD, 0x7aff09c4) ERR#25 ENOTTY
19174: ioctl(0, TIOCSLTC, 0x40004b30) ERR#25 ENOTTY
19174: ioctl(0, FIONBIO, 0x7aff0a08) ERR#25 ENOTTY
19174: ioctl(1, FIONBIO, 0x7aff0a08) ERR#25 ENOTTY
19174: close(4) = 0
19174: ioctl(0, TCSETATTRD, 0x7aff0a04) ERR#25 ENOTTY
19174: ioctl(0, TIOCSLTC, 0x40004b38) ERR#25 ENOTTY
19174: ioctl(0, FIONBIO, 0x7aff0a48) ERR#25 ENOTTY
19174: ioctl(1, FIONBIO, 0x7aff0a48) ERR#25 ENOTTY
19174: select(2, NULL, 0x7aff09b8, NULL, NULL) = 1
19174: ioctl(0, TCSETATTRD, 0x7aff0a04) ERR#25 ENOTTY
19174: ioctl(0, TIOCSLTC, 0x40004b30) ERR#25 ENOTTY
19174: ioctl(0, FIONBIO, 0x7aff0a48) ERR#25 ENOTTY
19174: ioctl(1, FIONBIO, 0x7aff0a48) ERR#25 ENOTTY

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Ramkumar Devanathan — Mon, 24 Mar 2003 15:39:34 GMT

Ok Belina,

I guess that explains it. Your connection got closed and so, the pipe was broken!

I think I might have faced a similar problem in reading a file which was probably not present. what are the errors you get when you run the script actually?

- ramd.

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Dietmar Konermann — Tue, 25 Mar 2003 12:54:48 GMT

I digged a little bit around this symptom.

The problem is not 11.11 specific. Instead it applies for 11.00 and 11.11, but was actually introduced by patches.

In fact the fix for JAGab75328 (11.00 PHNE_22159, 11.11 PHNE_23937) introduced it. With this fix the connection is supposed to be dropped if "stty 0" is issued. As a side effect telnetd closes connections when the speed is "0"... unfortunately this is true when telnet's stdin is no tty.

JAGae02032 adresses this incompatibility. It is included in the latest telnetd patches (11.00 PHNE_26096, 11.11 PHNE_24829) and restores the original behaviour, unless telnetd's new "-y" option is used.

Best regards...
Dietmar.

Re: using ksh or posix sh coprocessor |& with telnet on HP-UX 11 works but not on 11.11

Belina Ang_1 — Tue, 25 Mar 2003 14:27:23 GMT

Thank you everybody for your help.

=) Thanks again....