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Determine My IP Address

Posted on 2003-10-27
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Last Modified: 2013-12-09
Hi,

I'm writing a perl script for firewall configuration and I need a way of determining my ip address into a variable.

Ie: The ip address of the person telnetted / ssh'd into the system and running the script.
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Question by:Plucka
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by:gheist
ID: 9631988
and which exactly is the address you need???
netstat and ifconfig may become useful when combined with awk
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by:Plucka
ID: 9632001
As above the IP address of the user running the script.
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Expert Comment

by:gheist
ID: 9632830
ahh, so
for remote only:
$ who am i | awk -F" " '// { print $4}'
and same for ssh only:
SSH_CLIENT variable is set by OpenSSH server(disable telnet NOW)
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Expert Comment

by:gheist
ID: 9632839
$ id -p
shows if su has been used...
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by:Plucka
ID: 9632936
Ok,

That doesnt work cause my server returns a DNS name in the who am i bit, I used to do that.

From your other post I can get the IP address by doing

netstat -n | grep '192.168.1.11.22'

Which shows me the connection on port 22 to the server 192.168.1.11 This returns.

tcp4       0     20  192.168.1.11.22      192.168.1.60.4895    ESTABLISHED

which using your awk example i can do this.

netstat -n | grep '192.168.1.11.22' | awk -F" " '// { print $5}'

which gives me

192.168.1.60.4895

So i'm almost there, have little experience with awk, can you help me with the awk command to pull off the last .4895 bit.
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by:Plucka
ID: 9632955
Ok if I add

netstat -n | grep '192.168.1.11.22' | awk -F" " '// { print $5}' -F"." '// {print $1$2$3$4}'

I get the ip address without the .'s ie (192.168.1.60 is shown as 192168160)  
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by:gheist
ID: 9633323
no need for grep:
netstat -n | awk -F" " '/192.168.1.11.22/ { print $5}' -F"." '// {print $1.$2.$3.$4}'
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gheist earned 2000 total points
ID: 9633376
now you tell you have only ssh:

echo $SSH_CLIENT | awk '// {print $1}'
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