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8.6

Chat room in Perl

Asked by arno_webmaster in Perl Programming Language

Can you find the bugs in this code.

FILE: chat.html

<HTML>
<HEAD>
<TITLE>Chat-room</TITLE>
</HEAD>
<BODY BGCOLOR="white" TEXT="black">
<FORM NAME="login" ACTION="cgi-bin/login.pl" METHOD=POST>
Pseudo: <INPUT TYPE=TEXT NAME="pseudo" VALUE=""><BR>
ASV: <INPUT TYPE=TEXT NAME="asv" VALUE=""><BR>
<INPUT TYPE=SUBMIT NAME="submit" VALUE="Log in"><INPUT TYPE=RESET VALUE="Annuler"><BR>
</FORM>
</BODY>
</HTML>


FILE: cgi-bin/CHAT.PL

#!/usr/local/bin/perl
#

$domain="www.aees.misc.ulg.ac.be/";
$path="http://$domain";

read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
  ($name, $value) = split(/=/, $pair);
  $value =~ tr/+/ /;
  $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
  $FORM{$name} = $value;
}

print <<EnTete;
Content-type: text/html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Final//FR">
<HTML>
<HEAD>
<TITLE>Chat-room</TITLE>
</HEAD>
<BODY BGCOLOR="white" TEXT="black">
<FORM NAME="chat" ACTION="$path/cgi-bin/chat.pl" METHOD=POST>
<INPUT TYPE=HIDDEN NAME="pseudo" VALUE="$FORM{pseudo}">
<INPUT TYPE=HIDDEN NAME="asv" VALUE="$FORM{asv}">
Message: <INPUT TYPE=TEXT NAME="msg" VALUE=""><BR>
Couleur: #<INPUT TYPE=TEXT NAME="R" VALUE="00" SIZE=2 MAXSIZE=2><INPUT TYPE=TEXT NAME="G" VALUE="00" SIZE=2 MAXSIZE=2><INPUT TYPE=TEXT NAME="B" VALUE="00" SIZE=2 MAXSIZE=2><BR>
<INPUT TYPE=SUBMIT NAME="Submit" VALUE="Envoyer"><INPUT TYPE=RESET NAME="reset" VALUE="Annuler"><BR>
</FORM><BR><A HREF="$path/cgi-bin/quit.pl">Quitter</A><BR>
<HR WIDTH="100%"><BR>
<TABLE BORDER=0>
EnTete

open(MSG,">>msg.dat") || die $!;
#Faut-il faire précéder msg.dat de cgi-bin???
if($FORM{message} ne "")
{
  print MSG "$FORM{pseudo}|$FORM{asv}|#$FORM{R}$FORM{G}$FORM{B}|$FORM{message}\n";
}
close(MSG);
open(MSG,"<msg.dat") || die $!;
while(!EOF)
{
  $message=<MSG>;
  ($pseudo, $asv, $color, $texte) = split(/|/, $message);
  if($message!="")
  {
    print <<Contenu;
    <TR><TD BGCOLOR="lightblue"><CENTER><B>$pseudo</B><BR>$asv</CENTER></TD><TD><FONT COLOR="$color">$message</FONT></TD></TR>
    Contenu
  }
}
close(MSG);
print <<Fin;
</TABLE><BR>
</BODY>
</HTML>

Fin

FILE: cgi-bin/LOGIN.PL
#!/usr/local/bin/perl
#

$domain="www.aees.misc.ulg.ac.be";
$path="http://$domain";

read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
  ($name, $value) = split(/=/, $pair);
  $value =~ tr/+/ /;
  $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
  $FORM{$name} = $value;
}

print <<EnTete;
Content-type: text/html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Final//FR">
<HTML>
<HEAD>
<TITLE>Chat-room</TITLE>
</HEAD>
<BODY BGCOLOR="white" TEXT="black">
<FORM NAME="chat" ACTION="$path/cgi-bin/chat.pl" METHOD="POST">
<INPUT TYPE=HIDDEN NAME="pseudo" VALUE="$FORM{pseudo}">
<INPUT TYPE=HIDDEN NAME="asv" VALUE="$FORM{asv}">
Message: <INPUT TYPE=TEXT NAME="msg" VALUE=""><BR>
Couleur: #<INPUT TYPE=TEXT NAME="R" VALUE="00" SIZE=2 MAXSIZE=2><INPUT TYPE=TEXT NAME="G" VALUE="00" SIZE=2 MAXSIZE=2><INPUT TYPE=TEXT NAME="B" VALUE="00" SIZE=2 MAXSIZE=2><BR>
<INPUT TYPE=SUBMIT NAME="Submit" VALUE="Envoyer"><INPUT TYPE=RESET NAME="reset" VALUE="Annuler"><BR>
</FORM><BR><A HREF="$path/cgi-bin/quit.pl">Quitter</A><BR>
<HR WIDTH="100%"><BR>
<TABLE BORDER=0>
EnTete

open(MSG,">>msg.dat") || die $!;
if($FORM{message} ne "")
{
  print MSG "$FORM{pseudo}|$FORM{asv}|#000000|$FORM{pseudo} est entr& dans la salle.\n";
}
close(MSG);
open(MSG,"<msg.dat") || die $!;
while(!EOF)
{
  $message=<MSG>;
  ($pseudo, $asv, $color, $texte) = split(/|/, $message);
  print <<Contenu;
  <TR><TD BGCOLOR="lightblue"><CENTER><B>$pseudo</B><BR>$asv</CENTER></TD><TD><FONT COLOR="$color">$message</FONT></TD></TR>
  Contenu
}
close(MSG);
print <<Fin;
</TABLE><BR>
</BODY>
</HTML>

Fin

FILE: cgi-bin/QUIT.PL

#!/usr/local/bin/perl
#

$domain="www.aees.misc.ulg.ac.be";
$path="http://$domain";

read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
  ($name, $value) = split(/=/, $pair);
  $value =~ tr/+/ /;
  $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
  $FORM{$name} = $value;
}

print <<EnTete;
Content-type: text/html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Final//FR">
<HTML>
<HEAD>
<TITLE>Chat-room</TITLE>
</HEAD>
<BODY BGCOLOR="white" TEXT="black">
<P>Au revoir.</P>
<A HREF="$path/chat.html">Retour</A><BR>
EnTete

open(MSG,">>msg.dat") || die $!;
if($FORM{'message'}!="")
{
  print MSG "$FORM{pseudo}|$FORM{asv}|$FORM{pseudo} a quitté la salle.\n";
}
close(MSG);

print "</BODY></HTML>\n";


FILE: cgi-bin/MSG.DAT

Webmaster|00/X/Server|#FF0000|Welcome to the chat-room

Thanks.
[+][-]08/28/00 09:29 AM, ID: 4099727Expert Comment

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[+][-]08/29/00 09:20 AM, ID: 4117079Accepted Solution

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Zone: Perl Programming Language
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Solution Provided By: maneshr
Participating Experts: 1
Solution Grade: B
 
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