#!/usr/bin/perl -w
# Magic Packet for the Web
# Perl version by ken.yap@acm.org after DOS/Windows C version posted by
# Steve_Marfisi@3com.com on the Netboot mailing list
# modified to work with web by G. Knauf <info@gknw.de>
# Released under GNU Public License
#
require "cgi-lib.pl";
use Socket;

$ver = 'v0.52 &copy; gk 2003-Apr-24 11:00:00';

# Defaults - Modify to point to the location of your mac file
$www = "$ENV{'DOCUMENT_ROOT'}/perldemo";
$maclist = "$www/maclist.txt";
# Defaults - Modify to fit to your network
$defbc = '255.255.255.255';
$port = 60000;

MAIN: 
{
  # Read in all the variables set by the form
  if (&ReadParse(*input)) {
    &process_form();
  } else {
    &print_form();
  }
}

sub process_form {
  # Print the header
  print &PrintHeader();
  # If defined new mac save it
  if (defined($input{'mac'})) {
    print &HtmlTop("Result of adding an entry to the maclist");
    print '<HR><H3><TT>';
    &add_entry;
    print '</TT></H3><HR>';
    print '<FORM method="POST"><input type=submit value="ok"></FORM>';
  } else {
    # send magic packets to selected macs
    print &HtmlTop("Result of sending magic packets to multiple PCs");
    print '<HR><H3><TT>';
    if (defined($input{'all'})) {
      &process_file(S);
    } else {
      foreach $x (keys %input) {
        my ($brc,$mac) = split(/-/,$input{$x}); 
        &send_broadcast_packet(inet_aton($brc),$mac);
      }
    }
    print '</TT></H3><HR>';
    print '<form><input type=button value="back" onClick="history.back()"></FORM>';
  }
  # Close the document cleanly.
  print &HtmlBot;
  exit;
}

sub print_form {
  print &PrintHeader();
  print &HtmlTop("Form for sending magic packets to multiple PCs");
  # Print out the body of the form
  print <<ENDOFTEXT;
<HR>
<FORM method="POST">
<H2> Select the destination mac addresses: </H2>
<TABLE BORDER COLS=3 WIDTH="80%">
<TR>
<TD><CENTER><B><FONT SIZE="+1">Broadcast address</FONT></B></CENTER></TD>
<TD><CENTER><B><FONT SIZE="+1">MAC address</FONT></B></CENTER></TD>
<TD><CENTER><B><FONT SIZE="+1">Name</FONT></B></CENTER></TD>
<TD><CENTER><B><FONT SIZE="+1"><input type=checkbox name="all" value="all">Select all</FONT></B></CENTER></TD>
</TR>
ENDOFTEXT
  # build up table with mac addresses
  &process_file;
  # print rest of the form
  print <<ENDOFTEXT;
</TABLE>
<P><B><FONT SIZE="+1">
Press <input type="submit" value="wakeup"> to send the magic packets to your selections. 
Press <input type="reset" value="clear"> to reset the form.
</FONT></B>
</FORM>
<HR>
<FORM method="POST">
<H2>Enter new destination mac address:</H2>
<B><FONT SIZE="+1">Broadcast: </FONT></B><input name="brc" size="15" maxlength="15" value="$defbc"> 
<B><FONT SIZE="+1">MAC: </FONT></B><input name="mac" size=17 maxlength=17> 
<B><FONT SIZE="+1">Name: </FONT></B><input name="ip" size=40 maxlength=40>
<P><B><FONT SIZE="+1">
Press <input type="submit" value="save"> to add the entry to your maclist. 
Press <input type="reset" value="clear"> to reset the form.
</FONT></B>
</FORM>
<HR>
$ver
ENDOFTEXT
  # Close the document cleanly.
  print &HtmlBot;
}

sub send_broadcast_packet {
  my ($nbc,$mac) = @_;
  if ($mac !~ /^[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}$/i)  {
    print "Malformed MAC address $mac<BR>\n";
    return;
  }
  printf("Sending wakeup packet to %04X:%08X-%s<BR>\n", $port, unpack('N',$nbc), $mac);
  # Remove colons
  $mac =~ tr/://d;
  # Magic packet is 6 bytes of FF followed by the MAC address 16 times
  $magic = ("\xff" x 6) . (pack('H12', $mac) x 16);
  # Create socket
  socket(S, PF_INET, SOCK_DGRAM, getprotobyname('udp')) or die "socket: $!\n";
  # Enable broadcast
  setsockopt(S, SOL_SOCKET, SO_BROADCAST, 1) or die "setsockopt: $!\n";
  # Send the wakeup packet
  defined(send(S, $magic, 0, sockaddr_in($port, $nbc))) or print "send: $!\n";
  close(S);
}

sub process_file {
  unless (open(F, $maclist)) {
    print "Error reading $maclist: $!\n";
  } else {
    while (<F>) {
      next if (/^\s*#|^\s*;/);	# skip comments
      my ($mac, $ip) = split;
      next if (!defined($mac) or $mac eq '');
      $mac = uc($mac);
      my $bc = $defbc;
      ($bc,$mac) = split(/-/,$mac) if ($mac =~ /-/);
      my $nbc = inet_aton($bc);
      if ($_[0] eq 'S') {
        &send_broadcast_packet($nbc, $mac);
      } else {
        my $hbc = sprintf("0x%08X", unpack('N',$nbc));
        print "<TD WIDTH=20%><CENTER><TT>$hbc</TT></CENTER></TD>";
        print "<TD WIDTH=30%><CENTER><TT>$mac</TT></CENTER></TD>";
        $ip = '&nbsp;' if (!defined($ip) or $ip eq '');
        print "<TD WIDTH=30%><CENTER><TT>$ip</TT></CENTER></TD>";
        print "<TD WIDTH=20%><CENTER><input type=checkbox name=mac$. value=$hbc-$mac><TT>WakeUp</TT></CENTER></TD></TR>\n";
      }
    }
    close(F);
  }
}

sub add_entry {
  if (param("brc") !~ /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/i) {
    print "Malformed broadcast address ",param("brc"),"\n";
    return;
  }
  if (param("mac") !~ /^[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}:[\da-f]{2}$/i) {
    print "Malformed MAC address ",param("mac"),"\n";
    return;
  }
  unless (open(F, ">> $maclist")) {
    print "Error writing $maclist: $!\n";
  } else {
    #my $nbc = inet_aton(param("brc"));
    #my $hbc = sprintf("0x%8X", unpack('N',$nbc));
    #print F $hbc."-".uc(param("mac"))." ".param("ip")."\n";
    print F param("brc")."-".uc(param("mac"))." ".param("ip")."\n";
    close(F);
    print "Saved entry to maclist: ".param("brc")."-".uc(param("mac"))." ".param("ip")."\n";
  }
}