#!/usr/bin/perl
##############################################################################
# FormMail                        Version 1.6                                #
# Copyright 1995-1997 Matt Wright mattw@worldwidemart.com                    #
# Created 06/09/95                Last Modified 05/02/97                     #
# Matt's Script Archive, Inc.:    http://www.worldwidemart.com/scripts/      #
##############################################################################
# COPYRIGHT NOTICE                                                           #
# Copyright 1995-1997 Matthew M. Wright  All Rights Reserved.                #
#                                                                            #
# FormMail may be used and modified free of charge by anyone so long as this #
# copyright notice and the comments above remain intact.  By using this      #
# code you agree to indemnify Matthew M. Wright from any liability that      #
# might arise from its use.                                                  #
#                                                                            #
# Selling the code for this program without prior written consent is         #
# expressly forbidden.  In other words, please ask first before you try and  #
# make money off of my program.                                              #
#                                                                            #
# Obtain permission before redistributing this software over the Internet or #
# in any other medium.	In all cases copyright and header must remain intact #
##############################################################################
# Define Variables                                                           #
#	 Detailed Information Found In README File.                            #

# $mailprog defines the location of your sendmail program on your unix       #
# system.                                                                    #

$mailprog = '/usr/lib/sendmail';

# @referers allows forms to be located only on servers which are defined     #
# in this field.  This security fix from the last version which allowed      #
# anyone on any server to use your FormMail script on their web site.        #

@referers = ('worldwidemart.com','206.31.72.203');

# Done                                                                       #
##############################################################################

# Check Referring URL
&check_url;

# Retrieve Date
&get_date;

# Parse Form Contents
&parse_form;

# Check Required Fields
&check_required;

# Return HTML Page or Redirect User
&return_html;

# Send E-Mail
&send_mail;

sub check_url {

    # Localize the check_referer flag which determines if user is valid.     #
    local($check_referer) = 0;

    # If a referring URL was specified, for each valid referer, make sure    #
    # that a valid referring URL was passed to FormMail.                     #

    if ($ENV{'HTTP_REFERER'}) {
        foreach $referer (@referers) {
            if ($ENV{'HTTP_REFERER'} =~ m|https?://([^/]*)$referer|i) {
                $check_referer = 1;
                last;
            }
        }
    }
    else {
        $check_referer = 1;
    }

    # If the HTTP_REFERER was invalid, send back an error.                   #
    if ($check_referer != 1) { &error('bad_referer') }
}

sub get_date {

    # Define arrays for the day of the week and month of the year.           #
    @days   = ('Sunday','Monday','Tuesday','Wednesday',
               'Thursday','Friday','Saturday');
    @months = ('January','February','March','April','May','June','July',
	         'August','September','October','November','December');

    # Get the current time and format the hour, minutes and seconds.  Add    #
    # 1900 to the year to get the full 4 digit year.                         #
    ($sec,$min,$hour,$mday,$mon,$year,$wday) = (localtime(time))[0,1,2,3,4,5,6];
    $time = sprintf("%02d:%02d:%02d",$hour,$min,$sec);
    $year += 1900;

    # Format the date.                                                       #
    $date = "$days[$wday], $months[$mon] $mday, $year at $time";

}

sub parse_form {

    # Define the configuration associative array.                            #
    %Config = ('recipient','',          'subject','',
               'email','',              'realname','',
               'redirect','',           'bgcolor','',
               'background','',         'link_color','',
               'vlink_color','',        'text_color','',
               'alink_color','',        'title','',
               'sort','',               'print_config','',
               'required','',           'env_report','',
               'return_link_title','',  'return_link_url','',
               'print_blank_fields','', 'missing_fields_redirect','');

    # Determine the form's REQUEST_METHOD (GET or POST) and split the form   #
    # fields up into their name-value pairs.  If the REQUEST_METHOD was      #
    # not GET or POST, send an error.                                        #
    if ($ENV{'REQUEST_METHOD'} eq 'GET') {
        # Split the name-value pairs
        @pairs = split(/&/, $ENV{'QUERY_STRING'});
    }
    elsif ($ENV{'REQUEST_METHOD'} eq 'POST') {
        # Get the input
        read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
 
        # Split the name-value pairs
        @pairs = split(/&/, $buffer);
    }
    else {
        &error('request_method');
    }

    # For each name-value pair:                                              #
    foreach $pair (@pairs) {

        # Split the pair up into individual variables.                       #
        local($name, $value) = split(/=/, $pair);
 
        # Decode the form encoding on the name and value variables.          #
        $name =~ tr/+/ /;
        $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;

        $value =~ tr/+/ /;
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;

        # If they try to include server side includes, erase them, so they
        # aren't a security risk if the html gets returned.  Another 
        # security hole plugged up.
        $value =~ s/<!--(.|\n)*-->//g;

        # If the field name has been specified in the %Config array, it will #
        # return a 1 for defined($Config{$name}}) and we should associate    #
        # this value with the appropriate configuration variable.  If this   #
        # is not a configuration form field, put it into the associative     #
        # array %Form, appending the value with a ', ' if there is already a #
        # value present.  We also save the order of the form fields in the   #
        # @Field_Order array so we can use this order for the generic sort.  #
        if (defined($Config{$name})) {
            $Config{$name} = $value;
        }
        else {
            if ($Form{$name} && $value) {
                $Form{$name} = "$Form{$name}, $value";
            }
            elsif ($value) {
                push(@Field_Order,$name);
                $Form{$name} = $value;
            }
        }
    }

    # The next six lines remove any extra spaces or new lines from the       #
    # configuration variables, which may have been caused if your editor     #
    # wraps lines after a certain length or if you used spaces between field #
    # names or environment variables.                                        #
    $Config{'required'} =~ s/(\s+|\n)?,(\s+|\n)?/,/g;
    $Config{'required'} =~ s/(\s+)?\n+(\s+)?//g;
    $Config{'env_report'} =~ s/(\s+|\n)?,(\s+|\n)?/,/g;
    $Config{'env_report'} =~ s/(\s+)?\n+(\s+)?//g;
    $Config{'print_config'} =~ s/(\s+|\n)?,(\s+|\n)?/,/g;
    $Config{'print_config'} =~ s/(\s+)?\n+(\s+)?//g;

    # Split the configuration variables into individual field names.         #
    @Required = split(/,/,$Config{'required'});
    @Env_Report = split(/,/,$Config{'env_report'});
    @Print_Config = split(/,/,$Config{'print_config'});
}

sub check_required {

    # Localize the variables used in this subroutine.                        #
    local($require, @error);

    if (!$Config{'recipient'}) {
        if (!defined(%Form)) { &error('bad_referer') }
        else                 { &error('no_recipient') }
    }

    # For each require field defined in the form:                            #
    foreach $require (@Required) {

        # If the required field is the email field, the syntax of the email  #
        # address if checked to make sure it passes a valid syntax.          #
        if ($require eq 'email' && !&check_email($Config{$require})) {
            push(@error,$require);
        }

        # Otherwise, if the required field is a configuration field and it   #
        # has no value or has been filled in with a space, send an error.    #
        elsif (defined($Config{$require})) {
            if (!$Config{$require}) {
                push(@error,$require);
            }
        }

        # If it is a regular form field which has not been filled in or      #
        # filled in with a space, flag it as an error field.                 #
        elsif (!$Form{$require}) {
            push(@error,$require);
        }
    }

    # If any error fields have been found, send error message to the user.   #
    if (@error) { &error('missing_fields', @error) }
}

sub return_html {
    # Local variables used in this subroutine initialized.                   #
    local($key,$sort_order,$sorted_field);

    # If redirect option is used, print the redirectional location header.   #
    if ($Config{'redirect'}) {
        print "Location: $Config{'redirect'}\n\n";
    }

    # Otherwise, begin printing the response page.                           #
    else {

        # Print HTTP header and opening HTML tags.                           #
        print "Content-type: text/html\n\n";
        print "<html>\n <head>\n";

        # Print out title of page                                            #
        if ($Config{'title'}) { print "  <title>$Config{'title'}</title>\n" }
        else                  { print "  <title>Thank You</title>\n"        }

        print " </head>\n <body";

        # Get Body Tag Attributes                                            #
        &body_attributes;

        # Close Body Tag                                                     #
        print ">\n  <center>\n";

        # Print custom or generic title.                                     #
        if ($Config{'title'}) { print "   <h1>$Config{'title'}</h1>\n" }
        else { print "   <h1>Thank You For Filling Out This Form</h1>\n" }

        print "</center>\n";

        print "Below is what you submitted to $Config{'recipient'} on ";
        print "$date<p><hr size=1 width=75\%><p>\n";

        # Sort alphabetically if specified:                                  #
        if ($Config{'sort'} eq 'alphabetic') {
            foreach $field (sort keys %Form) {

                # If the field has a value or the print blank fields option  #
                # is turned on, print out the form field and value.          #
                if ($Config{'print_blank_fields'} || $Form{$field}) {
                    print "<b>$field:</b> $Form{$field}<p>\n";
                }
            }
        }

        # If a sort order is specified, sort the form fields based on that.  #
        elsif ($Config{'sort'} =~ /^order:.*,.*/) {

            # Set the temporary $sort_order variable to the sorting order,   #
            # remove extraneous line breaks and spaces, remove the order:    #
            # directive and split the sort fields into an array.             #
            $sort_order = $Config{'sort'};
            $sort_order =~ s/(\s+|\n)?,(\s+|\n)?/,/g;
            $sort_order =~ s/(\s+)?\n+(\s+)?//g;
            $sort_order =~ s/order://;
            @sorted_fields = split(/,/, $sort_order);

            # For each sorted field, if it has a value or the print blank    #
            # fields option is turned on print the form field and value.     #
            foreach $sorted_field (@sorted_fields) {
                if ($Config{'print_blank_fields'} || $Form{$sorted_field}) {
                    print "<b>$sorted_field:</b> $Form{$sorted_field}<p>\n";
                }
            }
        }

        # Otherwise, default to the order in which the fields were sent.     #
        else {

            # For each form field, if it has a value or the print blank      #
            # fields option is turned on print the form field and value.     #
            foreach $field (@Field_Order) {
                if ($Config{'print_blank_fields'} || $Form{$field}) {
                    print "<b>$field:</b> $Form{$field}<p>\n";
                }
            }
        }

        print "<p><hr size=1 width=75%><p>\n";

        # Check for a Return Link and print one if found.                    #
        if ($Config{'return_link_url'} && $Config{'return_link_title'}) {
            print "<ul>\n";
            print "<li><a href=\"$Config{'return_link_url'}\">$Config{'return_link_title'}</a>\n";
            print "</ul>\n";
        }

        # Print the page footer.                                             #
        print <<"(END HTML FOOTER)";
        <hr size=1 width=75%><p> 
        <center><font size=-1><a href="http://www.worldwidemart.com/scripts/formmail.shtml">FormMail</a> V1.6 &copy; 1995 -1997  Matt Wright<br>
A Free Product of <a href="http://www.worldwidemart.com/scripts/">Matt's Script Archive, Inc.</a></font></center>
        </body>
       </html>
(END HTML FOOTER)
    }
}

sub send_mail {
    # Localize variables used in this subroutine.                            #
    local($print_config,$key,$sort_order,$sorted_field,$env_report);

    # Open The Mail Program
    open(MAIL,"|$mailprog -t");

    print MAIL "To: $Config{'recipient'}\n";
    print MAIL "From: $Config{'email'} ($Config{'realname'})\n";

    # Check for Message Subject
    if ($Config{'subject'}) { print MAIL "Subject: $Config{'subject'}\n\n" }
    else                    { print MAIL "Subject: WWW Form Submission\n\n" }

    print MAIL "Below is the result of your feedback form.  It was submitted by\n";
    print MAIL "$Config{'realname'} ($Config{'email'}) on $date\n";
    print MAIL "-" x 75 . "\n\n";

    if (@Print_Config) {
        foreach $print_config (@Print_Config) {
            if ($Config{$print_config}) {
                print MAIL "$print_config: $Config{$print_config}\n\n";
            }
        }
    }

    # Sort alphabetically if specified:                                      #
    if ($Config{'sort'} eq 'alphabetic') {
        foreach $field (sort keys %Form) {

            # If the field has a value or the print blank fields option      #
            # is turned on, print out the form field and value.              #
            if ($Config{'print_blank_fields'} || $Form{$field} ||
                $Form{$field} eq '0') {
                print MAIL "$field: $Form{$field}\n\n";
            }
        }
    }

    # If a sort order is specified, sort the form fields based on that.      #
    elsif ($Config{'sort'} =~ /^order:.*,.*/) {

        # Remove extraneous line breaks and spaces, remove the order:        #
        # directive and split the sort fields into an array.                 #
        $Config{'sort'} =~ s/(\s+|\n)?,(\s+|\n)?/,/g;
        $Config{'sort'} =~ s/(\s+)?\n+(\s+)?//g;
        $Config{'sort'} =~ s/order://;
        @sorted_fields = split(/,/, $Config{'sort'});

        # For each sorted field, if it has a value or the print blank        #
        # fields option is turned on print the form field and value.         #
        foreach $sorted_field (@sorted_fields) {
            if ($Config{'print_blank_fields'} || $Form{$sorted_field} ||
                $Form{$sorted_field} eq '0') {
                print MAIL "$sorted_field: $Form{$sorted_field}\n\n";
            }
        }
    }

    # Otherwise, default to the order in which the fields were sent.         #
    else {

        # For each form field, if it has a value or the print blank          #
        # fields option is turned on print the form field and value.         #
        foreach $field (@Field_Order) {
            if ($Config{'print_blank_fields'} || $Form{$field} ||
                $Form{$field} eq '0') {
                print MAIL "$field: $Form{$field}\n\n";
            }
        }
    }

    print MAIL "-" x 75 . "\n\n";

    # Send any specified Environment Variables to recipient.                 #
    foreach $env_report (@Env_Report) {
        if ($ENV{$env_report}) {
            print MAIL "$env_report: $ENV{$env_report}\n";
        }
    }

    close (MAIL);
}

sub check_email {
    # Initialize local email variable with input to subroutine.              #
    $email = $_[0];

    # If the e-mail address contains:                                        #
    if ($email =~ /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/ ||

        # the e-mail address contains an invalid syntax.  Or, if the         #
        # syntax does not match the following regular expression pattern     #
        # it fails basic syntax verification.                                #

        $email !~ /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/) {

        # Basic syntax requires:  one or more characters before the @ sign,  #
        # followed by an optional '[', then any number of letters, numbers,  #
        # dashes or periods (valid domain/IP characters) ending in a period  #
        # and then 2 or 3 letters (for domain suffixes) or 1 to 3 numbers    #
        # (for IP addresses).  An ending bracket is also allowed as it is    #
        # valid syntax to have an email address like: user@[255.255.255.0]   #

        # Return a false value, since the e-mail address did not pass valid  #
        # syntax.                                                            #
        return 0;
    }

    else {

        # Return a true value, e-mail verification passed.                   #
        return 1;
    }
}

sub body_attributes {
    # Check for Background Color
    if ($Config{'bgcolor'}) { print " bgcolor=\"$Config{'bgcolor'}\"" }

    # Check for Background Image
    if ($Config{'background'}) { print " background=\"$Config{'background'}\"" }

    # Check for Link Color
    if ($Config{'link_color'}) { print " link=\"$Config{'link_color'}\"" }

    # Check for Visited Link Color
    if ($Config{'vlink_color'}) { print " vlink=\"$Config{'vlink_color'}\"" }

    # Check for Active Link Color
    if ($Config{'alink_color'}) { print " alink=\"$Config{'alink_color'}\"" }

    # Check for Body Text Color
    if ($Config{'text_color'}) { print " text=\"$Config{'text_color'}\"" }
}

sub error { 
    # Localize variables and assign subroutine input.                        #
    local($error,@error_fields) = @_;
    local($host,$missing_field,$missing_field_list);

    if ($error eq 'bad_referer') {
        if ($ENV{'HTTP_REFERER'} =~ m|^https?://([\w\.]+)|i) {
            $host = $1;
            print <<"(END ERROR HTML)";
Content-type: text/html

<html>
 <head>
  <title>Bad Referrer - Access Denied</title>
 </head>
 <body bgcolor=#FFFFFF text=#000000>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>Bad Referrer - Access Denied</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><td>The form attempting to use
     <a href="http://www.worldwidemart.com/scripts/formmail.shtml">FormMail</a>
     resides at <tt>$ENV{'HTTP_REFERER'}</tt>, which is not allowed to access
     this cgi script.<p>

     If you are attempting to configure FormMail to run with this form, you need
     to add the following to \@referers, explained in detail in the README file.<p>

     Add <tt>'$host'</tt> to your <tt><b>\@referers</b></tt> array.<hr size=1>
     <center><font size=-1>
      <a href="http://www.worldwidemart.com/scripts/formmail.shtml">FormMail</a> V1.6 &copy; 1995 - 1997  Matt Wright<br>
      A Free Product of <a href="http://www.worldwidemart.com/scripts/">Matt's Script Archive, Inc.</a>
     </font></center>
    </td></tr>
   </table>
  </center>
 </body>
</html>
(END ERROR HTML)
        }
        else {
            print <<"(END ERROR HTML)";
Content-type: text/html

<html>
 <head>
  <title>FormMail v1.6</title>
 </head>
 <body bgcolor=#FFFFFF text=#000000>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>FormMail</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><th><tt><font size=+1>Copyright 1995 - 1997 Matt Wright<br>
        Version 1.6 - Released May 02, 1997<br>
        A Free Product of <a href="http://www.worldwidemart.com/scripts/">Matt's Script Archive,
        Inc.</a></font></tt></th></tr>
   </table>
  </center>
 </body>
</html>
(END ERROR HTML)
        }
    }

    elsif ($error eq 'request_method') {
            print <<"(END ERROR HTML)";
Content-type: text/html

<html>
 <head>
  <title>Error: Request Method</title>
 </head>
 <body bgcolor=#FFFFFF text=#000000>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>Error: Request Method</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><td>The Request Method of the Form you submitted did not match
     either <tt>GET</tt> or <tt>POST</tt>.  Please check the form and make sure the
     <tt>method=</tt> statement is in upper case and matches <tt>GET</tt> or <tt>POST</tt>.<p>

     <center><font size=-1>
      <a href="http://www.worldwidemart.com/scripts/formmail.shtml">FormMail</a> V1.6 &copy; 1995 - 1997  Matt Wright<br>
      A Free Product of <a href="http://www.worldwidemart.com/scripts/">Matt's Script Archive, Inc.</a>
     </font></center>
    </td></tr>
   </table>
  </center>
 </body>
</html>
(END ERROR HTML)
    }

    elsif ($error eq 'no_recipient') {
            print <<"(END ERROR HTML)";
Content-type: text/html

<html>
 <head>
  <title>Error: No Recipient</title>
 </head>
 <body bgcolor=#FFFFFF text=#000000>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>Error: No Recipient</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><td>No Recipient was specified in the data sent to FormMail.  Please
     make sure you have filled in the 'recipient' form field with an e-mail
     address.  More information on filling in recipient form fields can be
     found in the README file.<hr size=1>

     <center><font size=-1>
      <a href="http://www.worldwidemart.com/scripts/formmail.shtml">FormMail</a> V1.6 &copy; 1995 - 1997  Matt Wright<br>
      A Free Product of <a href="http://www.worldwidemart.com/scripts/">Matt's Script Archive, Inc.</a>
     </font></center>
    </td></tr>
   </table>
  </center>
 </body>
</html>
(END ERROR HTML)
    }

    elsif ($error eq 'missing_fields') {
        if ($Config{'missing_fields_redirect'}) {
            print "Location: $Config{'missing_fields_redirect'}\n\n";
        }
        else {
            foreach $missing_field (@error_fields) {
                $missing_field_list .= "      <li>$missing_field\n";
            }

            print <<"(END ERROR HTML)";
Content-type: text/html

<html>
 <head>
  <title>Error: Blank Fields</title>
 </head>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>Error: Blank Fields</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><td>The following fields were left blank in your submission form:<p>
     <ul>
$missing_field_list
     </ul><br>

     These fields must be filled in before you can successfully submit the form.<p>
     Please use your browser's back button to return to the form and try again.<hr size=1>
     <center><font size=-1>
      <a href="http://www.worldwidemart.com/scripts/formmail.shtml">FormMail</a> V1.6 &copy; 1995 - 1997  Matt Wright<br>
      A Free Product of <a href="http://www.worldwidemart.com/scripts/">Matt's Script Archive, Inc.</a>
     </font></center>
    </td></tr>
   </table>
  </center>
 </body>
</html>
(END ERROR HTML)
        }
    }
    exit;
}

