By now you should know that I really like command line tools which operate well when applied to data through a pipe. I have posted quite a few tips already to do data manipulation on the command line. Today I wanted a quick way to lookup IP address locations and add them to a log file. After investigating a few free databases, I came accross Geo::IPFree, a Perl library which does the trick. So here is how you add the country code. First, this is the format of my log entries:
I want to get the country of the source address (first IP in the log). Here we go:
cat pflog.csv | perl -M'Geo::IPfree' -na -F/,/ -e '($country,$country_name)=Geo::IPfree::LookUp($F);chomp; print "$_,$country_name\n"'
And here the output:
10/13/2005 20:24:33.494358,126.96.36.199,188.8.131.52,,echo request,Europe