#!/usr/bin/perl
##############################################################################
# FormMail                        Version 1.9s-p7-d2                         #
# Copyright 1995-2001 Matt Wright mattw@scriptarchive.com                    #
# Created 06/09/95                Last Modified 05/20/02                     #
# Matt's Script Archive, Inc.:    http://www.scriptarchive.com/              #
# Enhanced Security Version:	  ftp://ftp.monkeys.com/pub/formmail/        #
# Even more stuff:                http://moensted.dk/formmail/               #
##############################################################################
# COPYRIGHT NOTICE                                                           #
# Copyright 1995-2002 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. #
##############################################################################
# ACCESS CONTROL FIX: Peter D. Thompson Yezek                                #
#                     http://www.securityfocus.com/archive/1/62033           #
##############################################################################
# MULTIPLE SECURITY FIXES: Ronald F. Guilmette; February 16, 2002            #
##############################################################################
# Even more stuff: dr. Jørgen Mash, may 2002                                 #
# Yet another fix by dr. Jürgen Mash, oct 2002                               #
##############################################################################
# Define Variables                                                           #
#	 Detailed Information Found In README File.                          #

# $mailprog defines the location of your sendmail program on your unix       #
# system.  (For FreeBSD, change this to "/usr/sbin/sendmail".)               #

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

# $mail_admin defines the e-mail address that should be used as the          #
# SMTP envelope sender address.  This will be the address to which           #
# FormMail-generated messages will be bounced if they are ever found         #
# to be undeliverable for any reason.  NOTE:  This should be some            #
# e-mail address that is ROUTINELY and FREQUENTLY monitored.                 #

# NOTE! NOTE NOTE!  RFC 2821 absolutely _requires_ every mail server to
# have a working postmaster e-mail address.  If you don't have one then
# for God's sake GET ONE!  This means YOU!

$mail_admin = "postmaster";

# @recipient_addresses defines the e-mail addresses that e-mail can          #
# be sent to.  This must be filled in correctly to prevent SPAM and allow    #
# valid addresses to receive e-mail.  Read the documentation to find out how #
# this variable works!!!  It is EXTREMELY IMPORTANT.                         #

@recipient_addresses = ();

# @bad_recipient_addresses defines the e-mail addresses that e-mail can't    #
# be sent to.  This can be use to exclude addresses otherwise premittet to   #
# receive e-mail.  Read the documentation to find out how this variable      #
# works!!!                                                                   #

@bad_recipient_addresses = ();

# @recipient_domains defines the e-mail domains that e-mail can              #
# be sent to.  This must be filled in correctly to prevent SPAM and allow    #
# valid addresses to receive e-mail.  Read the documentation to find out how #
# this variable works!!!  It is EXTREMELY IMPORTANT.                         #

@recipient_domains = ();

# @recipient_ips defines the IP addresses of the host of MX records of the   #
# e-mail domains that e-mail can be sent to.  This must be filled in         #
# correctly to prevent SPAM and allow valid addresses to receive e-mail.     #
# Read the documentation to find out how this variable works!!!  It is       #
# EXTREMELY IMPORTANT.                                                       #

@recipient_ips = ();

# @referers allows forms to be located only on servers which are defined     #
# in this array.  This is not a security fix, but can limit some use of      #
# formmail - if the users browser supports http referers                     #

@referers = ();

# @bad_referers disallows forms to be located on servers which are defined   #
# in this array.  This is not a security fix, but can limit some use of      #
# formmail - if the users browser supports http referers                     #

@bad_referers = ();

# ACCESS CONTROL FIX: Peter D. Thompson Yezek                                #
# @valid_ENV allows the sysadmin to define what environment variables can    #
# be reported via the env_report directive.  This was implemented to fix     #
# the problem reported at http://www.securityfocus.com/bid/1187              #

@valid_ENV = ('REMOTE_HOST','REMOTE_ADDR','REMOTE_USER','HTTP_USER_AGENT');

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

# to make recipient_ips work Net::DNS has to loadet...
use Net::DNS;

# Check Referring URL
&check_url;

# Retrieve Date
&get_date;

# Parse Form Contents
&parse_form;

# Check Required Fields
&check_required;

# Send E-Mail
&send_mail;

# Return HTML Page or Redirect User
&return_html;

# NOTE rev1.91: This function is no longer intended to stop abuse, that      #
#    functionality is now embedded in the checks made on @recipients and the #
#    recipient form field.                                                   #

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/$referer/i) {
                $check_referer = 1;
                last;
            }
        }
        foreach $bad_referer (@bad_referers) {
            if ($ENV{'HTTP_REFERER'} =~ m/$bad_referer/i) {
                $check_referer = 0;
                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.          #
        # v1.92: remove null bytes                                           #
        $name =~ tr/+/ /;
        $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
        $name =~ tr/\0//d;
        
		# Avoid any and all cross-site scripting security holes by re-coding
		# any < or > or " characters into their HTML equivalents.
		$name =~ s/</\&lt;/g;
		$name =~ s/>/\&gt;/g;
		$name =~ s/"/\&quot;/g;

        $value =~ tr/+/ /;
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
        $value =~ tr/\0//d;

		# Avoid any and all cross-site scripting security holes by re-coding
		# any < or > or " characters into their HTML equivalents.
		$value =~ s/</\&lt;/g;
		$value =~ s/>/\&gt;/g;
		$value =~ s/"/\&quot;/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} ne '') {
                $Form{$name} = "$Form{$name}, $value";
            } else {
                push(@Field_Order,$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'});

    # ACCESS CONTROL FIX: Only allow ENV variables in @valid_ENV in          #
    # @Env_Report for security reasons.                                      #
    foreach $env_item (@Env_Report) {
        foreach $valid_item (@valid_ENV) {
            if ( $env_item eq $valid_item ) { push(@temp_array, $env_item) }
        }
    } 
    @Env_Report = @temp_array;
}

sub check_required {

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

    # The following insures that there were no newlines in any fields which  #
    # will be used in the header.                                            #
    if ($Config{'subject'} =~ /(\n|\r)/m || $Config{'email'} =~ /(\n|\r)/m ||
        $Config{'realname'} =~ /(\n|\r)/m || $Config{'recipient'} =~ /(\n|\r)/m) {
        &error('invalid_headers');
    }
#    if ($Config{'subject'} =~ /(\n|\r)/m || $Config{'recipient'} =~ /(\n|\r)/m) {
#        &error('no_recipient');
#    }

    $Config{'recipient'} = "" unless ($Config{'recipient'});

    # Removed any poisoned nul bytes that may be present in the recipient CGI
    # parameter, just in case.  They might cause wacky behavior from some
    # mail servers.  See http://www.wiretrip.net/rfp/p/doc.asp/i2/d6.htm

    $Config{'recipient'} =~ tr /\0//d if ($Config{'recipient'});

    # Clean up the recipient CGI parameter further by replacing
    # all sequences of whitespace characters (including any possible
    # carriage returns and newlines) with a single space character.

    $Config{'recipient'} =~ s/\s+/ /gs if ($Config{'recipient'});

    if (!$Config{'recipient'}) {
        if (!defined(%Form)) { 
        	&error('bad_referer') 
        } else {
        	&error('no_recipient')
        }
    } else {
        # This block of code requires that the recipient address end with    #
        # a valid domain or e-mail address as defined in @recipients_*.      #

    # This block of code ensures that each comma-delimited substring of
    # the CGI recipient parameter ends with either an authorized domain
    # name or an authorized e-mail address as defined in @recipients.

outer:
        foreach $send_to (split(/,/,$Config{'recipient'})) {

	        # Eliminate any spurious leading or trailing whitespace in this
			# particular comma-separated subpart of the $Config{'recipient'}
			# CGI parameter value passed to the script.

	        $send_to =~ s/^ //;
    	    $send_to =~ s/ $//;

 			# Check that we still have a non-empty string.

			bad_recipient ("") unless ($send_to);
			
			# Syntax check the recipient address and fail if it is syntatically
			# invalid.

			if (($send_to =~ m/\@$/) || ($send_to =~ m/(!|%)/)) {
	    		    bad_recipient ($send_to);
			} elsif ($send_to =~ m/^(.+)\@([^\@]+)$/) {
	    	 	    $cgi_userid = $1;
			    $cgi_domain = $2;
			    bad_recipient ($send_to) unless (valid_userid ($cgi_userid));
			    bad_recipient ($send_to) unless (valid_domain ($cgi_domain));
			} else {  # $send_to contains _zero_ at-signs
	    		$cgi_userid = $send_to;
	    		undef $cgi_domain;
			    bad_recipient ($send_to) unless (valid_userid ($cgi_userid));
			}
			
			# Check for matches with the @bad_recipient_addresses array.

			foreach $badrecipient (@bad_recipient_addresses) {
				if ($send_to =~ /$badrecipient/i) {
					bad_recipient ($send_to)
				}
			}
			
			# Check for matches with the @recipient_addresses array.

			# Note that we check the validity of the elements of the
			# @recipient_addresses array itself (as we go) here also.

			# Allow for both local addresses (like "joe") and potentially
			# non-local addresses (like "joe@example.com") here.

			# @domain portions, if present, are compared case-insensitively,
			# however user-ID portions are compared case-sensitively.

			foreach $recipient_address (@recipient_addresses) {
			    if (($recipient_address =~ m/\@$/) || ($recipient_address =~ m/(%|!)/)) {
					error ('invalid_config_addr', $recipient_address);
				} elsif ($recipient_address =~ m/^(.+)\@([^\@]+)$/) {
					$conf_userid = $1;
					$conf_domain = $2;
					error ('invalid_config_addr', $recipient_address) if (!valid_userid ($conf_userid));
					error ('invalid_config_addr', $recipient_address) if (!valid_domain ($conf_domain));
   				} else { # $recipient_address contains _zero_ at-signs
					$conf_userid = $recipient_address;
					undef $conf_domain;
					error ('invalid_config_addr', $recipient_address) if (!valid_userid ($conf_userid));
				}
				if (($cgi_userid eq $conf_userid) && (defined $cgi_domain == defined $conf_domain)) {
					if (!defined $cgi_domain || (defined $cgi_domain && lc ($cgi_domain) eq lc ($conf_domain))) {
						push @send_to, $send_to;
						next outer;
					}
				}
        	}

			# Check for matches with the @recipient_domains array.

			# Note that we check the validity of the elements of the
			# @recipient_domains array itself (as we go) here also.

			# Allow for both specific domain names (like "example.com") and
			# prefix wild-carded domains (like "*.example.com") here.

			foreach $recipient_domain (@recipient_domains) {
	    		if ($recipient_domain =~ m/^\*\.(.+)$/) {
					$wild_carded = 1;
					$conf_domain = $1;
			    } else {
					$wild_carded = 0;
					$conf_domain = $recipient_domain;
			    }
	    		error ('invalid_config_domain', $recipient_domain) if (!valid_domain ($conf_domain));

	    		# Only for CGI parameter e-mail addresses that have a @domain
			    # suffix.  Check to see if the domain part matches something from
			    # the @recipient_domains array.  If the CGI parameter address
			    # doesn't have an @domain part, then skip these checks.  We can't
			    # match it against anything in @recipient_domains in that case.

	    		if (defined $cgi_domain) {

					# When we are doing domain name matching, disallow ``tricky''
					# e-mail addresses where the user-ID parts contain percent
					# signs or exclamation points.  These could otherwise be
					# used to direct the e-mail output of this script to some
					# unintended destinations.

					next if ($cgi_userid =~ m/(\%|\!)/);

					if ($wild_carded) {
		    			$dot_conf_domain = "." . $conf_domain;
		    			$tail = substr ($cgi_domain, - length ($dot_conf_domain));
					    if (lc ($tail) eq lc ($dot_conf_domain)) {
							push @send_to, $send_to;
							next outer;
					    }
					} else {
		    			if (lc ($cgi_domain) eq lc ($conf_domain)) {
							push @send_to, $send_to;
							next outer;
			    		}
					}
	    		}
        	}
        	
			# Check for matches with the @recipient_ips array.
			
			# Well actualy we just split the address and sends the domain
			# part off to a sub routine

        	if (defined (@recipient_ips)) {
				my ($cgi_name,$cgi_domain) = split(/@/,$send_to);
				if (valid_ip ($cgi_domain)) {
					push @send_to, $send_to;
					next outer;
				}
			}	

			# If we make it this far, then $send_to did not match anything
        	bad_recipient ($send_to);
	    }

		if ($#send_to < 0) {
        	&error('no_recipient')
        }
		$Config{'recipient'} = join(',',@send_to);
    }

    # Removed any poisoned nul bytes that may be present in the email CGI
    # parameter, just in case.  They might cause wacky behavior from some
    # mail servers.  See http://www.wiretrip.net/rfp/p/doc.asp/i2/d6.htm

    $Config{'email'} =~ tr /\0//d if ($Config{'email'});

    # Clean up the email CGI parameter further by replacing
    # all sequences of whitespace characters (including any possible
    # carriage returns and newlines) with a single space character.

    $Config{'email'} =~ s/\s+/ /gs if ($Config{'email'});

    # Removed any poisoned nul bytes that may be present in the realname CGI
    # parameter, just in case.  They might cause wacky behavior from some
    # mail servers.  See http://www.wiretrip.net/rfp/p/doc.asp/i2/d6.htm

    $Config{'realname'} =~ tr /\0//d if ($Config{'realname'});

    # Clean up the realname CGI parameter further by replacing
    # all sequences of whitespace characters (including any possible
    # carriage returns and newlines) with a single space character.

    $Config{'realname'} =~ s/\s+/ /gs if ($Config{'realname'});

    # Removed any poisoned nul bytes that may be present in the subject CGI
    # parameter, just in case.  They might cause wacky behavior from some
    # mail servers.  See http://www.wiretrip.net/rfp/p/doc.asp/i2/d6.htm

    $Config{'subject'} =~ tr /\0//d if ($Config{'subject'});

    # Clean up the subject CGI parameter further by replacing
    # all sequences of whitespace characters (including any possible
    # carriage returns and newlines) with a single space character.

    $Config{'subject'} =~ s/\s+/ /gs if ($Config{'subject'});

    # 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 ($require eq 'email' && !&valid_address($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 (!defined($Form{$require}) || $Form{$require} eq '') {
            push(@error,$require);
        }
    }

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

sub bad_recipient {
    my ($send_to) = @_;
    my $script_url;
    my $client_ip;
    my $orig_recipient_param;

    $script_url = "http://" . $ENV{'SERVER_NAME'} . ":" . 
                  $ENV{'SERVER_PORT'} . $ENV{'SCRIPT_NAME'};

    $client_ip = "[" . $ENV{'REMOTE_ADDR'} . "]";

    $orig_recipient_param = $Config{'recipient'};

    # Send a notice regarding possible script abuse to the $mail-admin

    open(MAIL,"|$mailprog -bm -f $mail_admin $mail_admin");

    print MAIL "To: $mail_admin\n";
    print MAIL "From: $script_url\n";
    print MAIL "Subject: Possible FormMail Script Abuse Detected\n";
    print MAIL "X-Generated-By: Matt Wright's FormMail.pl v1.9s-p7-d2\n";
    print MAIL "X-Script-URL: $script_url\n";
    print MAIL "X-Originating-IP: $client_ip\n\n";

    print MAIL "A possible case of attempted FormMail script abuse has\n";
    print MAIL "been detected.  The attempt originated from $client_ip.\n";
    print MAIL "Additional details follow...\n\n";
    print MAIL "URL: $script_url\n";
    print MAIL "Recipient Parameter: $orig_recipient_param\n\n";

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

	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";

    close MAIL;

    error ('invalid_recipient', $send_to);
}

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

    # Now that we have finished using form values for any e-mail related     #
    # reasons, we will convert all of the form fields and config values      #
    # to remove any cross-site scripting security holes.                     #
    local($field);
    foreach $field (keys %Config) {
        $safeConfig{$field} = &clean_html($Config{$field});
    }

    foreach $field (keys %Form) {
        $Form{$field} = &clean_html($Form{$field});
    }


    # If redirect option is used, print the redirectional location header.   #
    if ($Config{'redirect'}) {
	# Remove newlines, carriage returns and whitespace generally from
	# $Config{'redirect'}.  We don't want to allow clients to generate
	# their own added HTTP headers after all, now do we?
        $safeConfig{'redirect'} =~ s/\s//g;
        print "Location: $safeConfig{'redirect'}\n\n";
    }

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

        # Print HTTP header and opening HTML tags.                           #
        print "Content-type: text/html; charset=iso-8859-1\n\n";
        print "<html>\n <head>\n";

        # Print out title of page                                            #
        if ($Config{'title'}) {
        	print "<title>$safeConfig{'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 ($Config{'title'}) {
     		print "<h1>$safeConfig{'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 $safeConfig{'recipient'} on ";
        print "$date<p><hr size=1 width=75\%><p>\n";

        # If a sort order is specified, sort the form fields based on that.  #
        if ($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) {
                local $sfname = &clean_html($sorted_field);

                if ($Config{'print_blank_fields'} || $Form{$sorted_field} ne '') {
                    print "<b>$sfname:</b> $Form{$sorted_field}<p>\n";
                }
            }
        }

        # Otherwise, use the order the fields were sent, or alphabetic.      #
        else {

            # Sort alphabetically if requested.
            if ($Config{'sort'} eq 'alphabetic') {
                @Field_Order = sort @Field_Order;
            }

            # 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) {
                local $fname = &clean_html($field);

                if ($Config{'print_blank_fields'} || $Form{$field} ne '') {
                    print "<b>$fname:</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'} && $Config{'return_link_title'}) {
            print "<ul>\n";
            print "<li><a href=\"$safeConfig{'return_link_url'}\">$safeConfig{'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.scriptarchive.com/formmail.html">FormMail</a>&copy; Matt Wright<br>
A Free Product of <a href="http://www.scriptarchive.com/">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);

    my $script_url;
    my $client_ip;

    $script_url = "http://" . $ENV{'SERVER_NAME'} . ":" .
                  $ENV{'SERVER_PORT'} . $ENV{'SCRIPT_NAME'};

    $client_ip = "[" . $ENV{'REMOTE_ADDR'} . "]";

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

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

	print MAIL "MIME-Version: 1.0\n";
	print MAIL "Content-Type: text/plain; charset=\"ISO-8859-1\"\n";
	print MAIL "Content-Transfer-Encoding: 8bit\n";

	print MAIL "X-REMOTE_HOST: $ENV{REMOTE_HOST}\n";
    print MAIL "X-REMOTE_USER: $ENV{REMOTE_USER}\n";
    print MAIL "X-HTTP_USER_AGENT: $ENV{HTTP_USER_AGENT}\n";
	print MAIL "X-HTTP_REFERER: $ENV{'HTTP_REFERER'}\n";

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

    print MAIL "X-Generated-By: Matt Wright's FormMail.pl v1.9s-p7-d2\n";
    print MAIL "X-Script-URL: $script_url\n";
    print MAIL "X-Originating-IP: $client_ip\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";
            }
        }
    }

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

        # Remove extraneous line breaks and spaces, remove the order:        #
        # directive and split the sort fields into an array.                 #
        local $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} ne '') {
                print MAIL "$sorted_field: $Form{$sorted_field}\n\n";
            }
        }
    }

    # Otherwise, print fields in order they were sent or alphabetically.     #
    else {

        # Sort alphabetically if specified:                                  #
        if ($Config{'sort'} eq 'alphabetic') {
            @Field_Order = sort @Field_Order;
        }

        # 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} ne '') {
                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 valid_userid {
  my ($userid) = @_;

  # Disallow most special characters from the RFC 822/2822 reserved
  # character set in order to prevent tricky spammers from using
  # tricky e-mail address formats to trick this script into sending
  # e-mail to places where the installer did not intend to allow it
  # to go.

  return ($userid =~ m/[\(\)\[\]\{\}<>:;\@]/) ? 0 : 1;
}

sub valid_domain {
    my ($dom) = @_;

    if ($dom =~ m/^\[\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\]$/) {
		return 1;
    } elsif ($dom =~ m/^([a-z0-9]+(?:-+[a-z0-9]+)*\.)+[a-z]+$/i) {
		return 1;
    } else {
		return 0;
    }
}

# Check that a full e-mail address of the form "user@domain" has valid
# overall syntax.

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

    return ($email =~ m/^(.+)\@([^\@]+)$/
            && valid_userid ($1)
            && valid_domain ($2)) ? 1 : 0;
}

# This function will convert <, >, & and " to their HTML equivalents.        #
sub clean_html {
    local $value = $_[0];
    $value =~ s/\&/\&amp;/g;
    $value =~ s/</\&lt;/g;
    $value =~ s/>/\&gt;/g;
    $value =~ s/"/\&quot;/g;
    return $value;
}

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

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

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

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

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

    # Check for Body Text Color
    if ($Config{'text_color'}) { print " text=\"$safeConfig{'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;
            my $referer = &clean_html($ENV{'HTTP_REFERER'});
            print <<"(END ERROR HTML)";
Content-type: text/html; charset=iso-8859-1

<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.scriptarchive.com/formmail.html">FormMail</a>
     resides at <tt>$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 
     <a href="http://www.scriptarchive.com/readme/formmail.html">README</a> 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.scriptarchive.com/formmail.html">FormMail</a> V1.92 &copy; 1995 - 2002  Matt Wright<br>
      A Free Product of <a href="http://www.scriptarchive.com/">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 v1.92</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 - 2002 Matt Wright<br>
        Version 1.92 - Released April 21, 2002<br>
        A Free Product of <a href="http://www.scriptarchive.com/">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; charset=iso-8859-1

<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.scriptarchive.com/formmail.html">FormMail</a> V1.92 &copy; 1995 - 2002  Matt Wright<br>
      A Free Product of <a href="http://www.scriptarchive.com/">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; charset=iso-8859-1

<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>There was no recipient address specified in the data sent to FormMail.  Please
     make sure you have filled in the <tt>recipient</tt> form field with an e-mail
     address that has been configured in
     either <tt>\@recipient_addresses</tt>,
     <tt>\@recipient_domains</tt>
     or <tt>\@recipient_ips</tt>.
     More information on filling in <tt>recipient</tt> form fields
     and variables can be
     found in the README file.<hr size=1>

     <center><font size=-1>
      <a href="http://www.scriptarchive.com/formmail.html">FormMail</a> V1.92 &copy; 1995 - 2002  Matt Wright<br>
      A Free Product of <a href="http://www.scriptarchive.com/">Matt's Script Archive, Inc.</a>
     </font></center>
    </td></tr>
   </table>
  </center>
 </body>
</html>
(END ERROR HTML)
    }

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

<html>
 <head>
  <title>Error: Bad Header Fields</title>
 </head>
 <body bgcolor=#FFFFFF text=#000000>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>Error: Bad Header Fields</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><td>The header fields, which include <tt>recipient</tt>, <tt>email</tt>, <tt>realname</tt> and <tt>subject</tt> were
     filled in with invalid values. You may not include any newline characters in these parameters.
     More information on filling in these form fields and variables can be
     found in the <a href="http://www.scriptarchive.com/readme/formmail.html">README</a> file.<hr size=1>

     <center><font size=-1>
      <a href="http://www.scriptarchive.com/formmail.html">FormMail</a> V1.92 &copy; 1995 - 2002  Matt Wright<br>
      A Free Product of <a href="http://www.scriptarchive.com/">Matt's Script Archive, Inc.</a>
     </font></center>
    </td></tr>
   </table>
  </center>
 </body>
</html>
(END ERROR HTML)
    }
    
    elsif ($error eq 'invalid_recipient') {
            print <<"(END ERROR HTML)";
Content-type: text/html; charset=iso-8859-1

<html>
 <head>
  <title>Error: Invalid Recipient</title>
 </head>
 <body bgcolor=#FFFFFF text=#000000>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>Error: Invalid Recipient</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><td>There was an invalid recipient address specified in the data sent to FormMail.  Please
     make sure you have filled in the <tt>recipient</tt> form field with an e-mail
     address that has been configured in
     either <tt>\@recipient_addressess</tt>
     or else in <tt>\@recipient_domains</tt>.
     More information on filling in <tt>recipient</tt> form fields and
     variables can be
     found in the README file.<hr size=1>

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

    elsif ($error eq 'invalid_config_addr') {
            print <<"(END ERROR HTML)";
Content-type: text/html; charset=iso-8859-1

<html>
 <head>
  <title>Error: Invalid Configured Recipient Address</title>
 </head>
 <body bgcolor=#FFFFFF text=#000000>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>Error: Invalid Configured Recipient Address</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><td>There was an invalid recipient address specified in the
     recipient_addresses configuration variable of FormMail.  Please
     contact the FormMail installer and report this error.
     More information on installing and configuring FormMail can be
     found in the README file.<hr size=1>

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

    elsif ($error eq 'invalid_config_domain') {
            print <<"(END ERROR HTML)";
Content-type: text/html; charset=iso-8859-1

<html>
 <head>
  <title>Error: Invalid Configured Recipient Domain</title>
 </head>
 <body bgcolor=#FFFFFF text=#000000>
  <center>
   <table border=0 width=600 bgcolor=#9C9C9C>
    <tr><th><font size=+2>Error: Invalid Configured Recipient Domain</font></th></tr>
   </table>
   <table border=0 width=600 bgcolor=#CFCFCF>
    <tr><td>There was an invalid recipient domain specified in the
     recipient_domains configuration variable of FormMail.  Please
     contact the FormMail installer and report this error.
     More information on installing and configuring FormMail can be
     found in the README file.<hr size=1>

     <center><font size=-1>
      <a href="http://www.scriptarchive.com/formmail.html">FormMail</a> &copy; Matt Wright<br>
      A Free Product of <a href="http://www.scriptarchive.com/">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: " . &clean_html($Config{'missing_fields_redirect'}) . "\n\n";
        }
        else {
            foreach $missing_field (@error_fields) {
                $missing_field_list .= "<li>" . &clean_html($missing_field) . "\n";
            }

            print <<"(END ERROR HTML)";
Content-type: text/html; charset=iso-8859-1

<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.scriptarchive.com/formmail.html">FormMail</a> V1.92 &copy; 1995 - 2002  Matt Wright<br>
      A Free Product of <a href="http://www.scriptarchive.com/">Matt's Script Archive, Inc.</a>
     </font></center>
    </td></tr>
   </table>
  </center>
 </body>
</html>
(END ERROR HTML)
        }
    }

    exit;
}


# Check if there is MX records for the domain, and if the IP matches one 
# from the recipient_ips array

sub valid_ip {
	my ($host) = @_;
	my $res = new Net::DNS::Resolver;
	my @mx_list = mx($res, "$host");

	if (@mx_list) {
        if ($#mx_list == 0) {
			return 0;
        }
        for (my $i=0;$i<=$#mx_list;$i++) {
            my $smtp_result = $mx_list[$i]->exchange;
            ($ip, $host) = check_ip($smtp_result);
            foreach $recipient_ip (@recipient_ips) {
				if ($ip =~ m/$recipient_ip/i) {
					return 1;
				}
			}
        }
	}
	return 0; # no MX found to local ip's 
}

sub check_ip($) {
#  parts taken from rblchk.cgi - Open Relay Black List Datadase Checker
#  Copyright (C) 2001-2002 JIPPG <http://www.jippg.org/>
    my $host = @_;
    $host = shift;
    my($ip, $flag) = undef;
    if ($host =~ /\d+\.\d+\.\d+\.\d+/) {
		$ip = $host;
		my @ip = split(/\./, $ip);
	if ($#ip != 3) {
	#    print '<font color="red">IP Address</font>';
	    last;
	} 
		$host = gethostbyaddr(pack("C4", split(/\./, $ip)), 2);
    } else {
		$flag = 1;
		$ip = get_records($host, $flag);
    }
    return ($ip, $host);
}

sub get_records($$) {
#  parts taken from rblchk.cgi - Open Relay Black List Datadase Checker
#  Copyright (C) 2001-2002 JIPPG <http://www.jippg.org/>
    my ($target_host, $flag ) = @_;
    $target_host = shift;
    $flag = shift;
    my $ip = undef;

    my $res = new Net::DNS::Resolver;
    my $query = $res->search("$target_host");

    if ($query) {
		foreach my $rr ($query->answer) {
		    $ip = $rr->address if $rr->type eq "A";
		}
    } else {
		if ($flag == 1) {
			&error('invalid_recipient');
		}
		if ($flag == 2) {
			&error('invalid_recipient');
		}
    }
    return $ip;  
}