2 ###############################################################################
4 # IPFire.org - A linux based firewall #
5 # Copyright (C) 2007-2018 IPFire Team <info@ipfire.org> #
7 # This program is free software: you can redistribute it and/or modify #
8 # it under the terms of the GNU General Public License as published by #
9 # the Free Software Foundation, either version 3 of the License, or #
10 # (at your option) any later version. #
12 # This program is distributed in the hope that it will be useful, #
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of #
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
15 # GNU General Public License for more details. #
17 # You should have received a copy of the GNU General Public License #
18 # along with this program. If not, see <http://www.gnu.org/licenses/>. #
20 ###############################################################################
24 # enable only the following on debugging purpose
26 #use CGI::Carp 'fatalsToBrowser';
28 require '/var/ipfire/general-functions.pl';
29 require "${General::swroot}/lang.pl";
30 require "${General::swroot}/header.pl";
31 require "${General::swroot}/ids-functions.pl";
34 my %mainsettings = ();
37 my %rulesetsources = ();
42 # Read-in main settings, for language, theme and colors.
43 &General
::readhash
("${General::swroot}/main/settings", \
%mainsettings);
44 &General
::readhash
("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \
%color);
46 # Get the available network zones, based on the config type of the system and store
47 # the list of zones in an array.
48 my @network_zones = &IDS
::get_available_network_zones
();
50 # File where the used rulefiles are stored.
51 my $idsusedrulefilesfile = "$IDS::settingsdir/suricata-used-rulefiles.yaml";
53 # File where the addresses of the homenet are stored.
54 my $idshomenetfile = "$IDS::settingsdir/suricata-homenet.yaml";
58 &Header
::showhttpheaders
();
61 &Header
::getcgihash
(\
%cgiparams);
63 # Check if any error has been stored.
64 if (-e
$IDS::storederrorfile
) {
65 # Open file to read in the stored error message.
66 open(FILE
, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
68 # Read the stored error message.
69 $errormessage = <FILE
>;
74 # Delete the file, which is now not longer required.
75 unlink($IDS::storederrorfile
);
79 ## Grab all available snort rules and store them in the idsrules hash.
81 # Open snort rules directory and do a directory listing.
82 opendir(DIR
, $IDS::rulespath
) or die $!;
83 # Loop through the direcory.
84 while (my $file = readdir(DIR
)) {
87 next unless (-f
"$IDS::rulespath/$file");
90 next if (-z
"$IDS::rulespath/$file");
92 # Use a regular expression to find files ending in .rules
93 next unless ($file =~ m/\.rules$/);
95 # Ignore files which are not read-able.
96 next unless (-R
"$IDS::rulespath/$file");
98 # Call subfunction to read-in rulefile and add rules to
100 &readrulesfile
("$file");
105 # Gather used rulefiles.
107 # Check if the file for activated rulefiles is not empty.
108 if(-f
$idsusedrulefilesfile) {
109 # Open the file for used rulefile and read-in content.
110 open(FILE
, $idsusedrulefilesfile) or die "Could not open $idsusedrulefilesfile. $!\n";
118 # Loop through the array.
119 foreach my $line (@lines) {
124 next if ($line =~ /\#/);
127 next if ($line =~ /^\s*$/);
129 # Gather rule sid and message from the ruleline.
130 if ($line =~ /.*- (.*)/) {
133 # Add the rulefile to the %idsrules hash.
134 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
140 if ($cgiparams{'RULESET'} eq $Lang::tr
{'update'}) {
141 my $enabled_sids_file = "$IDS::settingsdir/oinkmaster-enabled-sids.conf";
142 my $disabled_sids_file = "$IDS::settingsdir/oinkmaster-disabled-sids.conf";
144 # Arrays to store sid which should be added to the corresponding files.
147 my @enabled_rulefiles;
149 # Loop through the hash of idsrules.
150 foreach my $rulefile(keys %idsrules) {
151 # Check if the rulefile is enabled.
152 if ($cgiparams{$rulefile} eq "on") {
153 # Add rulefile to the array of enabled rulefiles.
154 push(@enabled_rulefiles, $rulefile);
156 # Drop item from cgiparams hash.
157 delete $cgiparams{$rulefile};
161 # Loop through the hash of idsrules.
162 foreach my $rulefile (keys %idsrules) {
163 # Loop through the single rules of the rulefile.
164 foreach my $sid (keys %{$idsrules{$rulefile}}) {
165 # Skip the current sid if it is not numeric.
166 next unless ($sid =~ /\d+/ );
168 # Check if there exists a key in the cgiparams hash for this sid.
169 if (exists($cgiparams{$sid})) {
170 # Look if the rule is disabled.
171 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
172 # Check if the state has been set to 'on'.
173 if ($cgiparams{$sid} eq "on") {
174 # Add the sid to the enabled_sids array.
175 push(@enabled_sids, $sid);
177 # Drop item from cgiparams hash.
178 delete $cgiparams{$rulefile}{$sid};
182 # Look if the rule is enabled.
183 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
184 # Check if the state is 'on' and should be disabled.
185 # In this case there is no entry
186 # for the sid in the cgiparams hash.
187 # Add it to the disabled_sids array.
188 push(@disabled_sids, $sid);
190 # Drop item from cgiparams hash.
191 delete $cgiparams{$rulefile}{$sid};
197 # Open enabled sid's file for writing.
198 open(FILE
, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
200 # Write header to file.
201 print FILE
"#Autogenerated file. Any custom changes will be overwritten!\n";
203 # Check if the enabled_sids array contains any sid's.
205 # Loop through the array of enabled sids and write them to the file.
206 foreach my $sid (@enabled_sids) {
207 print FILE
"enablesid $sid\n";
211 # Close file after writing.
214 # Open disabled sid's file for writing.
215 open(FILE
, ">$disabled_sids_file") or die "Could not write to $disabled_sids_file. $!\n";
217 # Write header to file.
218 print FILE
"#Autogenerated file. Any custom changes will be overwritten!\n";
220 # Check if the enabled_sids array contains any sid's.
221 if (@disabled_sids) {
222 # Loop through the array of disabled sids and write them to the file.
223 foreach my $sid (@disabled_sids) {
224 print FILE
"disablesid $sid\n";
228 # Close file after writing.
231 # Open file for used rulefiles.
232 open (FILE
, ">$idsusedrulefilesfile") or die "Could not write to $idsusedrulefilesfile. $!\n";
234 # Write yaml header to the file.
235 print FILE
"%YAML 1.1\n";
236 print FILE
"---\n\n";
238 # Write header to file.
239 print FILE
"#Autogenerated file. Any custom changes will be overwritten!\n";
241 # Check if the enabled_rulefiles array contains any entries.
242 if (@enabled_rulefiles) {
243 # Loop through the array of rulefiles which should be loaded and write the to the file.
244 foreach my $file (@enabled_rulefiles) {
245 print FILE
" - $file\n";
249 # Close file after writing.
252 # Lock the webpage and print message.
253 &working_notice
("$Lang::tr{'snort working'}");
255 # Call oinkmaster to alter the ruleset.
258 # Check if the IDS is running.
259 if(&IDS
::ids_is_running
()) {
260 # Call suricatactrl to perform a reload.
261 &IDS
::call_suricatactrl
("reload");
267 # Download new ruleset.
268 } elsif ($cgiparams{'RULESET'} eq $Lang::tr
{'download new ruleset'}) {
269 # Check if the red device is active.
270 unless (-e
"${General::swroot}/red/active") {
271 $errormessage = $Lang::tr
{'could not download latest updates'};
274 # Check if enought free disk space is availabe.
275 if(&IDS
::checkdiskspace
()) {
276 $errormessage = "$Lang::tr{'not enough disk space'}";
279 # Check if any errors happend.
280 unless ($errormessage) {
281 # Lock the webpage and print notice about downloading
283 &working_notice
("$Lang::tr{'snort working'}");
285 # Call subfunction to download the ruleset.
286 if(&IDS
::downloadruleset
()) {
287 $errormessage = $Lang::tr
{'could not download latest updates'};
289 # Call function to store the errormessage.
290 &IDS
::_store_error_message
($errormessage);
292 # Preform a reload of the page.
295 # Call subfunction to launch oinkmaster.
298 # Check if the IDS is running.
299 if(&IDS
::ids_is_running
()) {
300 # Call suricatactrl to perform a reload.
301 &IDS
::call_suricatactrl
("reload");
304 # Perform a reload of the page.
308 # Save snort settings.
309 } elsif ($cgiparams{'IDS'} eq $Lang::tr
{'save'}) {
313 # Read-in current (old) IDS settings.
314 &General
::readhash
("$IDS::settingsdir/settings", \
%oldidssettings);
316 # Prevent form name from been stored in conf file.
317 delete $cgiparams{'IDS'};
319 # Check if an oinkcode has been provided.
320 if ($cgiparams{'OINKCODE'}) {
321 # Check if the oinkcode contains unallowed chars.
322 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
323 $errormessage = $Lang::tr
{'invalid input for oink code'};
327 # Go on if there are no error messages.
328 if (!$errormessage) {
329 # Store settings into settings file.
330 &General
::writehash
("$IDS::settingsdir/settings", \
%cgiparams);
333 # Generate file to store the home net.
334 &generate_home_net_file
();
336 # File which contains wheater the rules should be changed.
337 my $modify_sids_file = "$IDS::settingsdir/oinkmaster-modify-sids.conf";
339 # Open modify sid's file for writing.
340 open(FILE
, ">$modify_sids_file") or die "Could not write to $modify_sids_file. $!\n";
343 print FILE
"#Autogenerated file. Any custom changes will be overwritten!\n";
345 # Check if the configured runmode is IPS.
346 if ($cgiparams{'RUN_MODE'} eq 'IPS') {
347 # Tell oinkmaster to switch all rules from alert to drop.
348 print FILE
"modifysid \* \"alert\" \| \"drop\"\n";
354 # Check if the runmode has been changed.
355 if($cgiparams{'RUN_MODE'} ne $oldidssettings{'RUN_MODE'}) {
356 # Check if a ruleset exists.
358 # Lock the webpage and print message.
359 &working_notice
("$Lang::tr{'snort working'}");
361 # Call oinkmaster to alter the ruleset.
364 # Set reload_page to "True".
369 # Check if the IDS currently is running.
370 if(&IDS
::ids_is_running
()) {
371 # Check if ENABLE_IDS is set to on.
372 if($cgiparams{'ENABLE_IDS'} eq "on") {
373 # Call suricatactrl to perform a reload of suricata.
374 &IDS
::call_suricatactrl
("reload");
376 # Call suricatactrl to stop suricata.
377 &IDS
::call_suricatactrl
("stop");
380 # Call suricatactrl to start suricata.
381 &IDS
::call_suricatactrl
("start");
384 # Check if the page should be reloaded.
386 # Perform a reload of the page.
391 # Read-in idssettings
392 &General
::readhash
("$IDS::settingsdir/settings", \
%idssettings);
394 # If the runmode has not been configured yet, set default value.
395 unless(exists($idssettings{'RUN_MODE'})) {
396 # Set default to IPS.
397 $idssettings{'RUN_MODE'} = 'IPS';
400 $checked{'ENABLE_IDS'}{'off'} = '';
401 $checked{'ENABLE_IDS'}{'on'} = '';
402 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
403 $checked{'RUN_MODE'}{'IDS'} = '';
404 $checked{'RUN_MODE'}{'IPS'} = '';
405 $checked{'RUN_MODE'}{$idssettings{'RUN_MODE'}} = "checked='checked'";
406 $selected{'RULES'}{'nothing'} = '';
407 $selected{'RULES'}{'community'} = '';
408 $selected{'RULES'}{'emerging'} = '';
409 $selected{'RULES'}{'registered'} = '';
410 $selected{'RULES'}{'subscripted'} = '';
411 $selected{'RULES'}{$idssettings{'RULES'}} = "selected='selected'";
413 &Header
::openpage
($Lang::tr
{'intrusion detection system'}, 1, '');
418 // Tiny java script function to show/hide the rules
419 // of a given category.
420 function showhide(tblname) {
421 \$("#" + tblname).toggle();
427 &Header
::openbigbox
('100%', 'left', '', $errormessage);
430 &Header
::openbox
('100%', 'left', $Lang::tr
{'error messages'});
431 print "<class name='base'>$errormessage\n";
432 print " </class>\n";
436 # Draw current state of the IDS
437 &Header
::openbox
('100%', 'left', $Lang::tr
{'intrusion detection system'});
439 # Check if the IDS is running and obtain the process-id.
440 my $pid = &IDS
::ids_is_running
();
442 # Display some useful information, if suricata daemon is running.
444 # Gather used memory.
445 my $memory = &get_memory_usage
($pid);
448 <table width='95%' cellspacing='0' class='tbl'>
450 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
454 <td class='base'>$Lang::tr{'guardian daemon'}</td>
455 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
459 <td class='base'></td>
460 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
461 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
465 <td class='base'></td>
466 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
467 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
472 # Otherwise display a hint that the service is not launched.
474 <table width='95%' cellspacing='0' class='tbl'>
476 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
480 <td class='base'>$Lang::tr{'guardian daemon'}</td>
481 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
488 # Draw elements for IDS configuration.
489 &Header
::openbox
('100%', 'center', $Lang::tr
{'settings'});
493 # Check if a ruleset allready has been downloaded.
494 if ( -f
"$IDS::rulestarball"){
495 # Call stat on the filename to obtain detailed information.
496 my @Info = stat("$IDS::rulestarball");
498 # Grab details about the creation time.
499 $rulesdate = localtime($Info[9]);
503 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
504 <table width='100%' border='0'>
506 <td class='base' colspan='4'>
507 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
512 <td colspan='4'><br><br></td>
516 <td class='base' colspan='4'><b>$Lang::tr{'runmode'}</b></td>
520 <td class='base' colspan='4'>
521 <input type='radio' name='RUN_MODE' value='IDS' $checked{'RUN_MODE'}{'IDS'}>$Lang::tr{'intrusion detection system2'}    
522 <input type='radio' name='RUN_MODE' value='IPS' $checked{'RUN_MODE'}{'IPS'}>$Lang::tr{'intrusion prevention system'}
527 <td colspan='4'><br></td>
531 <td colspan='4'><b>$Lang::tr{'ids traffic analyze'}</b><br></td>
538 # Loop through the array of available networks and print config options.
539 foreach my $zone (@network_zones) {
543 # Convert current zone name to upper case.
544 my $zone_upper = uc($zone);
546 # Grab checkbox status from settings hash.
547 if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
548 $checked_input = "checked = 'checked'";
551 print "<td class='base' width='25%'>\n";
552 print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>$Lang::tr{'enabled on'} $Lang::tr{$zone}\n";
560 <td colspan='4'><br><br></td>
564 <td colspan='4'><b>$Lang::tr{'ids rules update'}</b></td>
568 <td colspan='4'><select name='RULES'>
569 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
570 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
571 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
572 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
573 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
580 <br>$Lang::tr{'ids rules license'} <a href='https://www.snort.org/subscribe' target='_blank'>www.snort.org</a>$Lang::tr{'ids rules license1'}</br>
581 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
586 <td colspan='4' nowrap='nowrap'>Oinkcode: <input type='text' size='40' name='OINKCODE' value='$idssettings{'OINKCODE'}'></td>
590 <td colspan='4' align='left'><br>
591 <input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'> $Lang::tr{'updates installed'}: $rulesdate
601 <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
610 &Header
::openbox
('100%', 'LEFT', $Lang::tr
{'intrusion detection system rules'});
611 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
613 # Output display table for rule files
614 print "<table width='100%'>\n";
616 # Local variable required for java script to show/hide
617 # rules of a rulefile.
618 my $rulesetcount = 1;
620 # Loop over each rule file
621 foreach my $rulefile (sort keys(%idsrules)) {
622 my $rulechecked = '';
624 # Check if rule file is enabled
625 if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
626 $rulechecked = 'CHECKED';
629 # Table and rows for the rule files.
631 print"<td class='base' width='5%'>\n";
632 print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
634 print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
635 print"<td class='base' width='5%' align='right'>\n";
636 print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
640 # Rows which will be hidden per default and will contain the single rules.
641 print"<tr style='display:none' id='ruleset$rulesetcount'>\n";
642 print"<td colspan='3'>\n";
649 # New table for the single rules.
650 print "<table width='100%'>\n";
652 # Loop over rule file rules
653 foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
655 my $ruledefchecked = '';
657 # Skip rulefile itself.
658 next if ($sid eq "Rulefile");
660 # If 2 rules have been displayed, start a new row
661 if (($lines % 2) == 0) {
664 # Increase rows by once.
670 $col="bgcolor='$color{'color20'}'";
672 $col="bgcolor='$color{'color22'}'";
676 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
677 $ruledefchecked = 'CHECKED';
680 # Create rule checkbox and display rule description
681 print "<td class='base' width='5%' align='right' $col>\n";
682 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
684 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
686 # Increment rule count
690 # If do not have a second rule for row, create empty cell
691 if (($lines % 2) != 0) {
692 print "<td class='base'></td>";
695 # Close display table
696 print "</tr></table></td></tr>";
698 # Finished whith the rule file, increase count.
702 # Close display table
708 <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
709 <!-- space for future online help link -->
717 &Header
::closebigbox
();
718 &Header
::closepage
();
721 ## A function to display a notice, to lock the webpage and
722 ## tell the user which action currently will be performed.
724 sub working_notice
($) {
727 &Header
::openpage
($Lang::tr
{'intrusion detection system'}, 1, '');
728 &Header
::openbigbox
('100%', 'left', '', $errormessage);
729 &Header
::openbox
( 'Waiting', 1,);
733 <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
739 &Header
::closebigbox
();
740 &Header
::closepage
();
744 ## A tiny function to perform a reload of the webpage after one second.
747 print "<meta http-equiv='refresh' content='1'>\n";
754 ## Private function to read-in and parse rules of a given rulefile.
756 ## The given file will be read, parsed and all valid rules will be stored by ID,
757 ## message/description and it's state in the idsrules hash.
759 sub readrulesfile
($) {
760 my $rulefile = shift;
762 # Open rule file and read in contents
763 open(RULEFILE
, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
765 # Store file content in an array.
766 my @lines = <RULEFILE
>;
771 # Loop over rule file contents
772 foreach my $line (@lines) {
773 # Remove whitespaces.
777 next if ($line =~ /^\s*$/);
783 # Gather rule sid and message from the ruleline.
784 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
788 # Check if a rule has been found.
790 # Add rule to the idsrules hash.
791 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
793 # Grab status of the rule. Check if ruleline starts with a "dash".
794 if ($line =~ /^\#/) {
795 # If yes, the rule is disabled.
796 $idsrules{$rulefile}{$sid}{'State'} = "off";
798 # Otherwise the rule is enabled.
799 $idsrules{$rulefile}{$sid}{'State'} = "on";
807 ## Function to get the used memory of a given process-id.
809 sub get_memory_usage
($) {
814 # Try to open statm file for the given process-id on the pseudo
816 if (open(FILE
, "/proc/$pid/statm")) {
820 # Splitt file content and store in an array.
821 my @memory = split(/ /,$temp);
826 # Calculate memory usage.
829 # Return memory usage.
833 # If the file could not be open, return nothing.
838 ## Function to generate the file which contains the home net information.
840 sub generate_home_net_file
() {
843 # Read-in network settings.
844 &General
::readhash
("${General::swroot}/ethernet/settings", \
%netsettings);
846 # Get available network zones.
847 my @network_zones = &IDS
::get_available_network_zones
();
849 # Temporary array to store network address and prefix of the configured
853 # Loop through the array of available network zones.
854 foreach my $zone (@network_zones) {
855 # Skip the red network - It never can be part to the home_net!
856 next if($zone eq "red");
858 # Convert current zone name into upper case.
861 # Generate key to access the required data from the netsettings hash.
862 my $zone_netaddress = $zone . "_NETADDRESS";
863 my $zone_netmask = $zone . "_NETMASK";
865 # Obtain the settings from the netsettings hash.
866 my $netaddress = $netsettings{$zone_netaddress};
867 my $netmask = $netsettings{$zone_netmask};
869 # Convert the subnetmask into prefix notation.
870 my $prefix = &Network
::convert_netmask2prefix
($netmask);
872 # Generate full network string.
873 my $network = join("/", $netaddress,$prefix);
875 # Check if the network is valid.
876 if(&Network
::check_subnet
($network)) {
877 # Add the generated network to the array of networks.
878 push(@networks, $network);
882 # Format home net declaration.
885 # Loop through the array of networks.
886 foreach my $network (@networks) {
887 # Add the network to the line.
888 $line = "$line" . "$network";
890 # Check if the current network was the last in the array.
891 if ($network eq $networks[-1]) {
893 $line = "$line" . "\]\"";
895 # Add "," for the next network.
896 $line = "$line" . "\,";
900 # Open file to store the addresses of the home net.
901 open(FILE
, ">$idshomenetfile") or die "Could not open $idshomenetfile. $!\n";
904 print FILE
"%YAML 1.1\n";
905 print FILE
"---\n\n";
907 # Print notice about autogenerated file.
908 print FILE
"#Autogenerated file. Any custom changes will be overwritten!\n";
910 # Print the generated and required HOME_NET declaration to the file.
911 print FILE
"HOME_NET:\t$line\n";