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#!/usr/local/perl/bin/perl -w # # Resolve IP addresses in web logs. # Diego Zamboni, Feb 7, 2000 use Socket; # Local domain mame $localdomain=".your.local.domain"; while (<>) { @f=split; if ($f[0] =~ /^[\d.]+$/) { if ($cache{$f[0]}) { $f[0]=$cache{$f[0]}; } else { $addr=inet_aton($f[0]); if ($addr) { $name=gethostbyaddr($addr, AF_INET); if ($name) { # NOTE: To ensure the veracity of $name, we really # would need to do a gethostbyname on it and compare # the result with the original $f[0], to prevent # someone spoofing us with false DNS information. # See the comments below. For this application, # we don't care too much, so we don't do this. # Fix local names if ($name !~ /\./) { $name.=$localdomain; } $cache{$f[0]}=$name; $f[0]=$name; } } } print join(" ", @f)."\n"; } else { print $_; } }

In reply to Resolve addresses in web access logs by ZZamboni

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