if(($user eq $cgi->param('user')) && ($passwort eq $cgi->param('pwd')))
{
        $session = new CGI::Session("id:md5", undef, {Directory=>'/tmp'});  # Session erzeugen
                
        print "Anmeldung erfolgreich!";
        print "Session ID: ";
        print ($session->id());   #  wird nicht angezeigt !
                
}
# wenn Username und Passwort nicht stimmt
else 
{
### DEBUG
print STDERR
  '$user:       ', $user, "\n",
  'param(user): ', $cgi->param('user'), "\n",
  '$passwort: : ', $passwort, "\n",
  'param(pwd) : ', $cgi->param('pwd'), "\n";  
}

#!/usr/bin/perl

use strict;
use warnings;

use CGI::Session;
use CGI;

my $SIDNAME = CGI::Session->name();

my $cgi = CGI->new;
my $sid = $cgi->cookie($SIDNAME) || $cgi->param($SIDNAME) || undef;

my $session = CGI::Session->load() or die CGI::Session->errstr();
if ( $session->is_empty ) {
    $session = CGI::Session->new() or die CGI::Session->errstr();
}

if ( $session->is_expired() ) {
    print $session->header(),
        $cgi->start_html(),
        $cgi->p("Your session timed out! Refresh the webpage!"),
        $cgi->end_html();
    exit(0);
}

$sid = $session->id;

my $cookie = $cgi->cookie( -name => $SIDNAME, -value => $sid );

my $username = $cgi->param('user') || '';
my $password = $cgi->param('pwd')  || '';

if ( $username ne '1' or $password ne '1' ) {    # Loginparameter falsch
    print $session->header;
    print qq(
                <h1>Login</h1>
                <form action="?$SIDNAME=$sid" method="POST">
                <p>
                User    : <input type="text" name="user">
                <br>
                Passwort: <input type=text name="pwd">
                <br>
                <input type="submit" value="Login">
                <input type="hidden" name="$SIDNAME" value="$sid">
                </p>
                </form>
);
    exit;
}
else {    # Login ok!
    $session->param( 'user',      $username );
    $session->param( 'loggedin',  1 );
    $session->param( 'lastvisit', "" . localtime() );

    print $session->header(
        -location => "intro.pl?$SIDNAME=$sid",
        -cookie   => $cookie,
    );
}

#!/usr/bin/perl

use strict;
use warnings;

use CGI;
use CGI::Session;

my $SIDNAME = CGI::Session->name();
my $cgi     = CGI->new;
my $sid     = $cgi->cookie($SIDNAME) || $cgi->param($SIDNAME) || undef;

my $session = CGI::Session->load() or die CGI::Session->errstr();

my $logged = $session->param('loggedin');
if ($logged) {
    my $user     = $session->param('user');
    my $lasttime = $session->param('lastvisit');
    print $session->header, <<HTML;
        <h1>Varry Sekret Webpadge</h1>
        <p>Hello <i>$user</i>,<br>you visited us at <tt>$lasttime</tt></p>
        <p>Pictures : <a href="http://example.org/oaioi/lil-iiii.html">of Lilly</a></p>
HTML
}
else {    # Login
    print $session->header( -location => 'login.pl' );
}

#!perl.exe

use strict;


use IO::Handle; 

use DBI;
use CGI;
use CGI::Session;
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

my $dbhost =    "localhost";
my $database =  "sensor";
my $dbuser =    "root";
my $dbpass =    "";

my $dsn = "DBI:mysql:database=$database; host=$dbhost";

my $dbh = DBI->connect($dsn, $dbuser, $dbpass) or die DBI::errstr;

my $cgi = new CGI;
my $select;

my $passwort;
my $user;
my $i=0;
my $session;

my $SESSION_EXPIRESAFTER = '+1h'; # nach einer Stunde, notfalls länger 1 W oder 1M 
my $SIDNAME = CGI::Session->name();
my $sid = $cgi->cookie($SIDNAME) || $cgi->param($SIDNAME) || undef;

$session = CGI::Session->load() or die CGI::Session->errstr();
$session->expires($SESSION_EXPIRESAFTER);
if ( $session->is_empty ) 
{
    $session = CGI::Session->new() or die CGI::Session->errstr();
}
if ( $session->is_expired() ) 
{
    print $session->header(),
        $cgi->start_html(),
        $cgi->p("Your session timed out! Refresh the webpage!"),
        $cgi->end_html();
    exit(0);
}
my $cookie = $cgi->cookie( 
        -name => $SIDNAME, -value => $sid, 
        -httponly => 1,
        -expires => $SESSION_EXPIRESAFTER,
);
        
$sid = $session->id;

my $errormessage;

if($cgi->param('login'))
{
        $select = $dbh->prepare("select benutzer,passwort from benutzer WHERE benutzer=? AND passwort=?;");
        $select->execute($cgi->param('user'), $cgi->param('pwd'));        
        
        while(($user, $passwort) = $select->fetchrow_array)
        {
                if(($user eq $cgi->param('user')) && ($passwort eq $cgi->param('pwd')))
                {                                          
                        $i++;
                        $session->param( 'user',$user );
                        $session->param( 'loggedin', 1 );
                        $session->param( 'lastvisit', "" . localtime() );

                        my $next_url = 'intro.cgi';
                        print $session->header
                        (
                                -location => $next_url,
                                -cookie   => $cookie
                        );
                        print "<font face='Arial' size='3' color=#339900><b>Anmeldung erfolgreich! Sie werden weitergeleitet...</b></font>";
                        exit;
                }       
        }
        if(! $i)                                
        {
                $errormessage = "<font face='Arial' size='3' color=#CC3300><b>Anmeldung fehlgeschlagen!</b></font>";
        }
}   

print $session->header( -type => 'text/html'); 

print "<html><head><meta http-equiv='content-type' content='text/html; charset=utf-8' /><link rel='stylesheet' media='screen,projection' type='text/css' href='/css/main.css' /><link rel='stylesheet' media='screen,projection' type='text/css' href='/css/scheme.css' />";
print "</head>";
print "<body>";
print "<form action='/cgi-bin/login.cgi' method='post'><div id='main'>";
print "<div id='footer'> 
        <h1 id='logo'><a>sensor.<span>ct</span></a></h1>
        <hr class='noscreen' />        
        </div> ";

                
print "<div id='navlogin'><ul class='box'><br><li><p><font face='Arial' size='6'><b>Login</b></font></p><br>
<p>$errormessage</p>
<blockquote>Benutzer-ID: <br><input type='text' size='30' name='user'></li></ul><br>
<ul class='box'><li><blockquote>Kennwort: <br><input type='password' size='30' name='pwd'></li></ul>";         
print "<br><ul class='box'><li><blockquote><br><input class='button' type='submit' name='login'  value='Einloggen'></li><br></ul></div> ";
print "</body></html>";

    

#!perl.exe

use strict;
use DBI;
use CGI;
use CGI::Session;
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

my $cgi = CGI->new();

my $session = CGI::Session->load() or die CGI::Session->errstr;

if (not ($session->param('loggedin') and $session->param('loggedin') == 1 ) )
{
        #nicht angemeldet!!!!
                
        # Weiterleiten zum Login
         my $next_url = 'login.cgi';
        print $session->header
                (
                        -location => $next_url
                );
        exit;           
}

# dann ist wohl eingeloggt, also Datenbank abfragen

my $dbhost =    "localhost";
my $database =  "sensor";
my $dbuser =    "root";
my $dbpass =    "";

my $dsn = "DBI:mysql:database=$database; host=$dbhost";

my $dbh = DBI->connect($dsn, $dbuser, $dbpass) or die DBI::errstr;

my $Gesamtsystemquery = $dbh->prepare("select wert from malcos_x;");

my $idMessung;
my $Beschreibung;
my $Wert;


print $cgi->header( -type => 'text/html');

print "<body bgcolor=#bfbfbf>";

print '<p><b><font size=6>Messungen:</font></b></p>';
print "<table border=1>\n";

$Gesamtsystemquery->execute;
while(($idMessung, $Beschreibung, $Wert) = $Gesamtsystemquery->fetchrow_array)
{
        print "  <tr>\n";

        print "    <td>System</td>\n";
        if($idMessung eq "0")
        {
                print "<td>aus</td>\n";
        }
        else
        {
                print "<td>ein</td>\n";
        }
        print "    <td></td>\n";
        print " </tr>\n";
}
$Gesamtsystemquery->finish;



$dbh->disconnect;


print "<br /><br />";