#!/usr/bin/perl

# This script saves access date+time, the visitor's host name, their IP
# address and browser type, and the refering page (if any) to a log file
# on your server (default name = logfile.txt). This file will be automatically
# mailed to your mailbox. You can change the mailing interval according
# to your needs (default value is every 50 accesses to the page to be
# logged). The script will autocreate the logfile, if it does not exist.


# don't change anything past this line unless you know what you are doing
# -----------------------------------------------------------------------

# create a date+time string
$shortdate = `date +"%D %T %Z"`; 
chop ($shortdate);

# Some of Perl's network info functions required here
($part1,$part2,$part3,$part4)=split(/\./,$ENV{REMOTE_ADDR});
$IP_adr=pack("C4",$part1,$part2,$part3,$part4);
($host_name)=(gethostbyaddr("$IP_adr", 2));

#print "Content-type: text/plain\n\n";

if ($check_host) {
   # read host and time info from last visitor
   if (-e "$hostfile") {
      open(HOST,"$hostfile");
      $hostline = <HOST>;
      chop($hostline) if $hostline =~ /\n$/;
      close(HOST);
      ($old_time,$old_number,$old_page,$old_browser) = split(/\|/,$hostline);
   }

   # save host and time info and check if this is a page reload
   open(HOST,">$hostfile");
   $seconds = time;
   print HOST "$seconds\|$ENV{REMOTE_ADDR}\|$ENV{'DOCUMENT_URI'}\|$ENV{'HTTP_USER_AGENT'}";
   close(HOST);

   if (time - $old_time < $interval
   && $ENV{REMOTE_ADDR} eq $old_number
   && $ENV{'DOCUMENT_URI'} eq $old_page
   && $ENV{'HTTP_USER_AGENT'} eq $old_browser) {
      exit;  # probably same visitor, so exit
   }
}

# open log file for output and append new log data
open (LOGFILE, ">>$logfile");
print LOGFILE "Time: $shortdate\n";
print LOGFILE "From: $ENV{'HTTP_REFERER'}\n";
print LOGFILE "IP  : $ENV{REMOTE_ADDR}\n" if $log_IP;
print LOGFILE "Host: $host_name\n";
print LOGFILE "With: $ENV{'HTTP_USER_AGENT'}\n";
print LOGFILE "Page: $ENV{'DOCUMENT_URI'}\n" if $log_page;
print LOGFILE "\n";
close (LOGFILE);

# open log file for input and count log entries
open (LOGFILE, $logfile);
@entries = <LOGFILE>;
close (LOGFILE);
$log_rows = 7;
$log_rows-- unless $log_page;
$log_rows-- unless $log_IP;
$log_count = @entries/$log_rows;

# if number of logs >= max. number of logs, mail file and delete it
if ($log_count >= $max_entries) {
   open (MAIL, "|$mailprogam $recipient") || die "Can't open $mailprogam!\n";
   print MAIL "Subject: Mail-log File\n\n";
   print MAIL "@entries\n";
   close MAIL;

   unlink $logfile;
}

# end of script