#! /usr/local/bin/perl

#   cgilog.cgi          This scrript is in the public domain.
#   Version 1.10   --   Dec.28.1997
#   http://www.fin.ne.jp/~yokubota/
#   Perl (release 4 or 5) script for Unix servers
#   Written by Yo Kubota(yokubota@fin.ne.jp)

#   Original script was written by W. Soldierer <hermes@all-yours.net>,
#   author of the Digital Postcard Perl program.
#   Free Digital postcards for your Web site:
#   http://www.all-yours.net/postcard/

#   Many thanks to Mr.Walter Soldierer (The auther of original script)
#   and Mr.Hamada (who wrote helpful explanations of original script)

# The aim of this script is to monitor visitor's behavior in your site.
# It can record logs of both page-access and data-access. It saves 
# date & time, the refering page or data name (ARGV[0]), the visitor's 
# host name, their IP address, browser type, their proxy info, and the 
# refering page (if any) to a log file on your server (default name is 
# logfile.txt"). 
# This file will be automatically mailed to your mailbox when log file is 
# full. You can change the mailing interval according to your needs 
# (default log file size is 50,000 bytes).

# ----- BEGIN INSTALLATION INSTRUCTIONS -----
#  - Save this script to a file cgilog.cgi
#  - Cut installation instructions (optional)
#  - Change the first script line, if your server's Perl executable
#    is not located in /usr/local/bin/perl
#  - Customize the settings below (*SETTINGS*)
#    * Change e-mail address for $recipient
#    * Set $max_size to your needs, if you want to have more or less
#      than 50,000 bytes mailed to your mailbox each time.
#    * Change path/filename for log file, if necessary
#      (default = logfile.txt in your cgi directory)
#  - Prepare empty log File (0 Byte text file, default name is logfile.txt).
#  - ASCII-upload log file, cgilog.cgi and Binary-upload new.gif to your
#    cgi directory (cgi-bin, cgi-local...)
#    Make log file being able to read and write (chmod logfile.txt 666)
#    Make cgilog.cgi executable (chmod mail-log.cgi 755)
#  - add the following line to HTML soures to be logged.
#    <IMG SRC="http://www.xxx..../..../cgilog.cgi?ARGV[0]">
#    ARGV[0] is the saved names of a refering page or a data name.
#  - change the data-links you want to be logged in HTML sources to 
#    the following line.
#    <A HREF="..../cgilog.cgi?ARGV[0]+ARGV[1]">.....</A>
#    ARGV[1] is a data location address.
#
#    * ARGV[0] and ARGV[1] are very important.
#      ARGV[0] becomes the recorded names of a refering page or a data name.
#      ARGV[1] constructs a data location name with $url (refer to settings).
#      If ARGV[1] dose not exist, the script regards a call as a page-access
#      log. If exists, it regards a call as a data-access and generates 
#      a data location name ($url+ARGV[1]).
#
#      For exsample, if you write ARGV[0] & ARGV[1] like this 
#           <A HREF="..../cgilog.cgi?cgi/+cgitext/cgilog.txt">.....</A>
#      and if you customize, 
#           $url = "http://www.fin.ne.jp/~yokubota/";
#      the generated data location name becomes 
#          http://www.fin.ne.jp/~yokubota/cgitext/cgilog.txt
#      and recoded data name becomes 
#          cgi/cgitext/cgilog.cgi
#
#  - ASCII-upload HTML sources.
#
#  You can contact with me in my site's Guest Book or via Email.
#
# ----- END INSTALLATION INSTRUCTIONS -----

$recipient = 'yokubota@fin.ne.jp';          # your mail address
$max_size = 50000;                          # entries number to mail
$logfile = './logfile.txt';                 # log file name
$mailprogam = '/usr/lib/sendmail';          # send mail path (absolute)
$url = "http://www.fin.ne.jp/~yokubota/";   # your url
$gif_image = './new.gif';                   # gif file name

#-----  Set up above to customize this script  ------------;

$gif_size = (stat($gif_image))[7];

# create a date+time string
($sec,$min,$hour,$mday,$mon,$year,$wday)=localtime(time);
$mon=$mon+1;
if ($sec < 10) { $sec = "0$sec"; }
if ($min < 10) { $min = "0$min"; }
if ($hour < 10) { $hour = "0$hour"; }
if ($mon < 10) { $mon = "0$mon"; }
$wday = ('Sun','Mon','Tue','Wed','Thu','Fri','Sat')[$wday];
$shortdate = "$year/$mon/$mday($wday)$hour:$min:$sec";

# 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));

if ($ARGV[1] eq "") {
    $| = 1;
    print "Content-type: image/gif\n";
    print "Content-length: $gif_size\n\n";
    open GIF, $gif_image;
    print <GIF>;
    close GIF;
} else {
    print "Location: $url$ARGV[1]\n\n";
}

# open log file for output and append new log data
open (LOGFILE, "+<$logfile") || die "Can't open logfile!\n";  # open for read AND write
flock(LOGFILE, 2);                      # lock it
$datelog = <LOGFILE>;                   # read date
if ((stat($logfile))[7] < $max_size) {  # log size over max size ?
    seek LOGFILE,0,2;                   # go to end of file
} else {                                # truncate log file & send mail
    seek LOGFILE,0,0;                   # go to begin of file
    @log = <LOGFILE>;                   # read log file
    seek LOGFILE,0,0;                   # go to begin of file
    truncate (LOGFILE,0);               # empty the file
    open (MAIL, "|$mailprogam -t") || die "Can't open $mailprogam!\n";
    print MAIL "From: log-mail.cgi\n";  # send mail
    print MAIL "To: $recipient\n";
    print MAIL "Subject: Mail-log File\n\n";
    print MAIL "@log\n";
    close MAIL;
}
print LOGFILE "$shortdate,$ARGV[0],$host_name,$ENV{'REMOTE_ADDR'},$ENV{'HTTP_USER_AGENT'},$ENV{'HTTP_VIA'},$ENV{'HTTP_X_FORWARDED_FOR'},$ENV{'HTTP_REFERER'}\n";
close LOGFILE;
exit(0);
# end of script