#!/usr/local/bin/perl require "sockets.pl"; $webmaster = "Shishir Gundavaram (shishir\@bu\.edu)"; $remote_address = $ENV{'REMOTE_ADDR'}; $cookie_server = "cgi.bu.edu"; $cookie_port = 5000; $document_root = "/home/shishir/httpd_1.4.2/public"; $error = "Cookie Client Error"; &parse_form_data (*FORM); $start_form = $FORM{'start'}; $next_form = $FORM{'next'}; $cookie = $FORM{'Magic_Cookie'}; if ($start_form) { $cookie = &get_new_cookie (); &parse_form ($start_form, $cookie); } elsif ($next_form) { &save_current_form ($cookie); &parse_form ($next_form, $cookie); } else { if ($cookie) { &last_form ($cookie); } else { &return_error (500, $error, "You have executed this script in an invalid manner."); } } exit (0); sub open_and_check { local ($first_line); &open_connection (COOKIE, $cookie_server, $cookie_port) || &return_error (500, $error, "Could not connect to cookie server."); chop ($first_line = ); if ($first_line !~ /^200/) { &return_error (500, $error, "Cookie server returned an error."); } } sub get_new_cookie { local ($cookie_line, $new_cookie); &open_and_check (); print COOKIE "new ", $remote_address, "\n"; chop ($cookie_line = ); &close_connection (COOKIE); if ( ($new_cookie) = $cookie_line =~ /^200: (\S+)$/) { return ($new_cookie); } else { &return_error (500, $error, "New cookie was not created."); } } sub parse_form { local ($form, $magic_cookie) = @_; local ($path_to_form); if ($form =~ /\.\./) { &return_error (500, $error, "What are you trying to do?"); } $path_to_form = join ("/", $document_root, $form); open (FILE, "<" . $path_to_form) || &return_error (500, $error, "Could not open form."); print "Content-type: text/html", "\n\n"; while () { if (/-\*Cookie\*-/) { s//$magic_cookie/g; } print; } close (FILE); } sub save_current_form { local ($magic_cookie) = @_; local ($ignore_fields, $cookie_line, $key); $ignore_fields = '(start|next|Magic_Cookie)'; &open_and_check (); print COOKIE "cookie $magic_cookie $remote_address", "\n"; chop ($cookie_line = ); if ($cookie_line =~ /^200/) { foreach $key (keys %FORM) { next if ($key =~ /\b$ignore_fields\b/o); print COOKIE $key, "=", $FORM{$key}, "\n"; chop ($cookie_line = ); if ($cookie_line !~ /^200/) { &return_error (500, $error, "Form info. could not be stored."); } } } else { &return_error (500, $error, "The cookie could not be set."); } &close_connection (COOKIE); } sub last_form { local ($magic_cookie) = @_; local ($cookie_line, $key_value, $key, $value); &open_and_check (); print COOKIE "cookie $magic_cookie $remote_address", "\n"; chop ($cookie_line = ); if ($cookie_line =~ /^200/) { print COOKIE "list", "\n"; &display_all_items (); print COOKIE "delete", "\n"; } else { &return_error (500, $error, "The cookie could not be set."); } &close_connection (COOKIE); } sub display_all_items { local ($key_value, $key, $value); print "Content-type: text/html", "\n\n"; print "", "\n"; print "Summary", "\n"; print "", "\n"; print "

Summary and Results

", "\n"; print "Here are the items/options that you selected:", "

", "\n"; while () { chop; last if (/^\.$/); $key_value = (split (/\s/, $_, 2))[1]; ($key, $value) = split (/=/, $key_value), "\n"; print "", $key, " = ", $value, "", "
", "\n"; } foreach $key (keys %FORM) { next if ($key =~ /^Magic_Cookie$/); print "", $key, " = ", $FORM{$key}, "", "
", "\n"; } print "", "\n"; } sub parse_form_data { local (*FORM_DATA) = @_; local ($query_string, @key_value_pairs, $key_value, $key, $value); read (STDIN, $query_string, $ENV{'CONTENT_LENGTH'}); if ($ENV{'QUERY_STRING'}) { $query_string = join("&", $query_string, $ENV{'QUERY_STRING'}); } @key_value_pairs = split (/&/, $query_string); foreach $key_value (@key_value_pairs) { ($key, $value) = split (/=/, $key_value); $key =~ tr/+/ /; $value =~ tr/+/ /; $key =~ s/%([\dA-Fa-f][\dA-Fa-f])/pack ("C", hex ($1))/eg; $value =~ s/%([\dA-Fa-f][\dA-Fa-f])/pack ("C", hex ($1))/eg; if (defined($FORM_DATA{$key})) { $FORM_DATA{$key} = join ("\0", $FORM_DATA{$key}, $value); } else { $FORM_DATA{$key} = $value; } } } sub return_error { local ($status, $keyword, $message) = @_; print "Content-type: text/html", "\n"; print "Status: ", $status, " ", $keyword, "\n\n"; print <CGI Program - Unexpected Error

$keyword

$message Please contact $webmaster for more information. End_of_Error exit(1); }