topic Re: dynamically set the IP address in DISPLAY variable in Operating System - HP-UX

dynamically set the IP address in DISPLAY variable

david.deng — Mon, 09 Feb 2009 19:07:45 GMT

I need dynamically set the IP address in DISPLAY variable. After I using windows command line telnet to HP UX 11i version 1, I run who am I -muR, it give me the part of ip address like ::ffff:172.16.12. The acctual ip address should be 172.16.123.87. How can I get the full ipv4 address or ipv4-mapped-ipv6 address.

Re: dynamically set the IP address in DISPLAY variable

Steven E. Protter — Mon, 09 Feb 2009 19:39:35 GMT

Shalom,

few way to do it.

HOSTNAME is already set.

So you can use nslookup or dig to get the ip address.

You will need to script it into a variable.

The exact data you want comes from ifconfig

In HP-UX ifconfig is a root only command and you need to give all users sudo permission to use it in order to do what you want.

SEP

Re: dynamically set the IP address in DISPLAY variable

TwoProc — Mon, 09 Feb 2009 20:18:21 GMT

How about...
$> DISPLAY=$(who am i -R |sed -e "s/^.*(//" -e "s/)$/:0.0")
$> echo $DISPLAY

See if that works for you.

Re: dynamically set the IP address in DISPLAY variable

david.deng — Mon, 09 Feb 2009 20:22:47 GMT

The problem is who am i -R only return part of the ip address.

Re: dynamically set the IP address in DISPLAY variable

James R. Ferguson — Mon, 09 Feb 2009 20:25:29 GMT

Hi David:

TwoProc meant to include a closing delimiter to his second 'sed' script:

# DISPLAY=$(who am i -R |sed -e "s/^.*(//" -e "s/)$/:0.0/")

Regards! :-)

...JRF...

Re: dynamically set the IP address in DISPLAY variable

david.deng — Mon, 09 Feb 2009 20:37:13 GMT

Hi James,

Your scripts works only when the "who am I" return the whole ip address. Right now if I using Exceed CDE to login, "who am I" return whole ip. However, if I using telnet from windows command line to login, "who am I" only return ip address like ::ffff:172.16.12.

Re: dynamically set the IP address in DISPLAY variable

TwoProc — Mon, 09 Feb 2009 21:24:47 GMT

Thanks for the catch on that James. I did leave it off.

David, I didn't try with a Windows Telnet - sorry I just used ssh command. Which brings up the question... Why are you using telnet? Why is it still enabled on your server? From a security standpoint - it really should be turned off, and you should convert to ssh. You can download a free version of "putty" to get the same character based interface, and it CAN forward X11 data in the tunnel, so that you can still connect to your Exceed display.

I know that's not what you asked - just trying to pass on some advice. Feel free to ignore if you have circumstances that allow telnets use without risk.

Sadly, I can't test the problem using telnet for you, because I don't have any systems that have it turned on anylonger.

However, you *could* try just this one thing:
add your ip address to the HP server's /etc/hosts file. That way, instead of listing an IP address from "who am i -R" you'd get a machine name instead.On my server, if the server knows my machine name (via /etc/hosts, dns, whatever and however) it prints that instead of an IP address. And DISPLAY=urcomputer:0.0 or DISPLAY=urcomputer.urdomain.com:0.0 or DISPLAY=xxx.xxx.xxx.xxx:0.0 is all just as good as any of the others.

This last suggestion, at least to me - might stand a reasonable chance of working out for you via telnet, in combination with the fixed DISPLAY command that JRF posted.

Re: dynamically set the IP address in DISPLAY variable

TwoProc — Wed, 11 Feb 2009 03:39:31 GMT

crickets ....