html/cgi-bin/dns.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2020  IPFire Development Team                                 #
   6 #                                                                             #
   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.                                         #
  11 #                                                                             #
  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.                                #
  16 #                                                                             #
  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/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 use strict;
  23 use IO::Socket;
  24
  25 # enable only the following on debugging purpose
  26 #use warnings;
  27 #use CGI::Carp 'fatalsToBrowser';
  28
  29 require '/var/ipfire/general-functions.pl';
  30 require "${General::swroot}/geoip-functions.pl";
  31 require "${General::swroot}/ids-functions.pl";
  32 require "${General::swroot}/lang.pl";
  33 require "${General::swroot}/header.pl";
  34
  35 #workaround to suppress a warning when a variable is used only once
  36 my @dummy = ( ${Header::colouryellow} );
  37 undef (@dummy);
  38
  39 my %cgiparams=();
  40 my %checked=();
  41 my %selected=();
  42 my $errormessage = '';
  43
  44 # Config file which stores the DNS settings.
  45 my $settings_file = "${General::swroot}/dns/settings";
  46
  47 # File which stores the configured DNS-Servers.
  48 my $servers_file = "${General::swroot}/dns/servers";
  49
  50 # Create files if the does not exist.
  51 unless (-f $settings_file) { system("touch $settings_file") };
  52 unless (-f $servers_file) { system("touch $servers_file") };
  53
  54 # File which stores the ISP assigned DNS servers.
  55 my @ISP_nameserver_files = ( "/var/run/dns1", "/var/run/dns2" );
  56
  57 # File which contains the ca-certificates.
  58 my $ca_certs_file = "/etc/ssl/certs/ca-bundle.crt";
  59
  60 # Server which is used, to determine if the whole DNS system works properly.
  61 my $dns_test_server = "ping.ipfire.org";
  62
  63 my $check_servers;
  64
  65 my %color = ();
  66 my %mainsettings = ();
  67 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  68 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  69
  70 &Header::showhttpheaders();
  71 &Header::getcgihash(\%cgiparams);
  72
  73 ##
  74 # Save general settings.
  75 #
  76 if ($cgiparams{'GENERAL'} eq $Lang::tr{'save'}) {
  77         # Prevent form name from been stored in conf file.
  78         delete $cgiparams{'GENERAL'};
  79
  80         # Add value for non-checked checkbox.
  81         if ($cgiparams{'USE_ISP_NAMESERVERS'} ne "on") {
  82                 $cgiparams{'USE_ISP_NAMESERVERS'} = "off";
  83         }
  84
  85         # Add value for non-checked checkbox.
  86         if ($cgiparams{'ENABLE_SAFE_SEARCH'} ne "on") {
  87                 $cgiparams{'ENABLE_SAFE_SEARCH'} = "off";
  88         }
  89
  90         # Check if using ISP nameservers and TLS is enabled at the same time.
  91         if (($cgiparams{'USE_ISP_NAMESERVERS'} eq "on") && ($cgiparams{'PROTO'} eq "TLS")) {
  92                 $errormessage = $Lang::tr{'dns isp nameservers and tls not allowed'}
  93         }
  94
  95         # Check if there was an error.
  96         if ( ! $errormessage) {
  97
  98                 # Store settings into settings file.
  99                 &General::writehash("$settings_file", \%cgiparams);
 100
 101                 # Call function to handle unbound restart, etc.
 102                 &_handle_unbound_and_more()
 103         }
 104 }
 105
 106 ###
 107 # Add / Edit entries.
 108 #
 109 if (($cgiparams{'SERVERS'} eq $Lang::tr{'save'}) || ($cgiparams{'SERVERS'} eq $Lang::tr{'update'})) {
 110         # Hash to store the generic DNS settings.
 111         my %settings = ();
 112
 113         # Read-in generic settings.
 114         &General::readhash("$settings_file", \%settings);
 115
 116         # Check if an IP-address has been given.
 117         if ($cgiparams{"NAMESERVER"} eq "") {
 118                 $errormessage = "$Lang::tr{'dns no address given'}";
 119         }
 120
 121         # Check if the given DNS server is valid.
 122         elsif(!&General::validip($cgiparams{"NAMESERVER"})) {
 123                 $errormessage = "$Lang::tr{'invalid ip'}: $cgiparams{'NAMESERVER'}";
 124         }
 125
 126         # Check if a TLS is enabled and no TLS_HOSTNAME has benn specified.
 127         elsif($settings{'PROTO'} eq "TLS") {
 128                 unless($cgiparams{"TLS_HOSTNAME"}) {
 129                         $errormessage = "$Lang::tr{'dns no tls hostname given'}";
 130                 } else {
 131                         # Check if the provided domain is valid.
 132                         unless(&General::validfqdn($cgiparams{"TLS_HOSTNAME"})) {
 133                                 $errormessage = "$Lang::tr{'invalid ip or hostname'}: $cgiparams{'TLS_HOSTNAME'}";
 134                         }
 135                 }
 136         }
 137
 138         # Go further if there was no error.
 139         if ( ! $errormessage) {
 140                 # Check if a remark has been entered.
 141                 $cgiparams{'REMARK'} = &Header::cleanhtml($cgiparams{'REMARK'});
 142
 143                 my %dns_servers = ();
 144                 my $id;
 145                 my $status;
 146
 147                 # Read-in configfile.
 148                 &General::readhasharray($servers_file, \%dns_servers);
 149
 150                 # Check if we should edit an existing entry and got an ID.
 151                 if (($cgiparams{'SERVERS'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 152                         # Assin the provided id.
 153                         $id = $cgiparams{'ID'};
 154
 155                         # Undef the given ID.
 156                         undef($cgiparams{'ID'});
 157
 158                         # Grab the configured status of the corresponding entry.
 159                         $status = $dns_servers{$id}[2];
 160                 } else {
 161                         # Each newly added entry automatically should be enabled.
 162                         $status = "enabled";
 163
 164                         # Generate the ID for the new entry.
 165                         #
 166                         # Sort the keys by their ID and store them in an array.
 167                         my @keys = sort { $a <=> $b } keys %dns_servers;
 168
 169                         # Reverse the key array.
 170                         my @reversed = reverse(@keys);
 171
 172                         # Obtain the last used id.
 173                         my $last_id = @reversed[0];
 174
 175                         # Increase the last id by one and use it as id for the new entry.
 176                         $id = ++$last_id;
 177
 178                         # The first allowed id is 3 to keep space for
 179                         # possible ISP assigned DNS servers.
 180                         if ($id <= "2") {
 181                                 $id = "3";
 182                         }
 183                 }
 184
 185                 # Add/Modify the entry to/in the dns_servers hash.
 186                 $dns_servers{$id} = ["$cgiparams{'NAMESERVER'}", "$cgiparams{'TLS_HOSTNAME'}", "$status", "$cgiparams{'REMARK'}"];
 187
 188                 # Write the changed hash to the config file.
 189                 &General::writehasharray($servers_file, \%dns_servers);
 190
 191                 # Call function to handle unbound restart, etc.
 192                 &_handle_unbound_and_more();
 193         } else {
 194                 # Switch back to previous mode.
 195                 $cgiparams{'SERVERS'} = $cgiparams{'MODE'};
 196         }
 197 ###
 198 # Toggle enable / disable.
 199 #
 200 } elsif ($cgiparams{'SERVERS'} eq $Lang::tr{'toggle enable disable'}) {
 201         my %dns_servers = ();
 202
 203         # Only go further, if an ID has been passed.
 204         if ($cgiparams{'ID'}) {
 205                 # Assign the given ID.
 206                 my $id = $cgiparams{'ID'};
 207
 208                 # Undef the given ID.
 209                 undef($cgiparams{'ID'});
 210
 211                 # Read-in configfile.
 212                 &General::readhasharray($servers_file, \%dns_servers);
 213
 214                 # Grab the configured status of the corresponding entry.
 215                 my $status = $dns_servers{$id}[2];
 216
 217                 # Switch the status.
 218                 if ($status eq "disabled") {
 219                         $status = "enabled";
 220                 } else {
 221                         $status = "disabled";
 222                 }
 223
 224                 # Modify the status of the existing entry.
 225                 $dns_servers{$id} = ["$dns_servers{$id}[0]", "$dns_servers{$id}[1]", "$status", "$dns_servers{$id}[3]"];
 226
 227                 # Write the changed hash back to the config file.
 228                 &General::writehasharray($servers_file, \%dns_servers);
 229
 230                 # Call function to handle unbound restart, etc.
 231                 &_handle_unbound_and_more();
 232         }
 233
 234 ## Remove entry from DNS servers list.
 235 #
 236 } elsif ($cgiparams{'SERVERS'} eq $Lang::tr{'remove'}) {
 237         my %dns_servers = ();
 238
 239         # Read-in configfile.
 240         &General::readhasharray($servers_file, \%dns_servers);
 241
 242         # Drop entry from the hash.
 243         delete($dns_servers{$cgiparams{'ID'}});
 244
 245         # Undef the given ID.
 246         undef($cgiparams{'ID'});
 247
 248         # Write the changed hash to the config file.
 249         &General::writehasharray($servers_file, \%dns_servers);
 250
 251         # Call function to handle unbound restart, etc.
 252         &_handle_unbound_and_more();
 253
 254 ## Handle request to check the servers.
 255 #
 256 } elsif ($cgiparams{'SERVERS'} eq $Lang::tr{'dns check servers'}) {
 257         $check_servers = 1;
 258 }
 259
 260 # Hash to store the generic DNS settings.
 261 my %settings = ();
 262
 263 # Read-in general DNS settings.
 264 &General::readhash("$settings_file", \%settings);
 265
 266 # Hash which contains the configured DNS servers.
 267 my %dns_servers = ();
 268
 269 # Read-in config file.
 270 &General::readhasharray("$servers_file", \%dns_servers);
 271
 272 &Header::openpage($Lang::tr{'dns'}, 1, '');
 273
 274 &Header::openbigbox('100%', 'left', '', $errormessage);
 275
 276 ###
 277 # Error messages layout.
 278 #
 279 if ($errormessage) {
 280         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 281         print "<class name='base'>$errormessage\n";
 282         print "&nbsp;</class>\n";
 283         &Header::closebox();
 284 }
 285
 286 # Handle if a nameserver should be added or edited.
 287 if (($cgiparams{'SERVERS'} eq "$Lang::tr{'add'}") || ($cgiparams{'SERVERS'} eq "$Lang::tr{'edit'}")) {
 288         # Display the sub page.
 289         &show_add_edit_nameserver();
 290
 291         # Close webpage.
 292         &Header::closebigbox();
 293         &Header::closepage();
 294
 295         # Finished here for the moment.
 296         exit(0);
 297 }
 298
 299 $cgiparams{'GENERAL'} = '';
 300 $cgiparams{'SERVERS'} = '';
 301 $cgiparams{'NAMESERVER'} = '';
 302 $cgiparams{'TLS_HOSTNAME'} = '';
 303 $cgiparams{'REMARK'} ='';
 304
 305 $checked{'USE_ISP_NAMESERVERS'}{'off'} = '';
 306 $checked{'USE_ISP_NAMESERVERS'}{'on'} = '';
 307 $checked{'USE_ISP_NAMESERVERS'}{$settings{'USE_ISP_NAMESERVERS'}} = "checked='checked'";
 308
 309 $checked{'ENABLE_SAFE_SEARCH'}{'off'} = '';
 310 $checked{'ENABLE_SAFE_SEARCH'}{'on'} = '';
 311 $checked{'ENABLE_SAFE_SEARCH'}{$settings{'ENABLE_SAFE_SEARCH'}} = "checked='checked'";
 312
 313 $selected{'PROTO'}{'UDP'} = '';
 314 $selected{'PROTO'}{'TLS'} = '';
 315 $selected{'PROTO'}{'TCP'} = '';
 316 $selected{'PROTO'}{$settings{'PROTO'}} = "selected='selected'";
 317
 318 $selected{'QNAME_MIN'}{'standard'} = '';
 319 $selected{'QNAME_MIN'}{'strict'} = '';
 320 $selected{'QNAME_MIN'}{$settings{'QNAME_MIN'}} = "selected='selected'";
 321
 322 # Display nameserver and configuration sections.
 323 &show_nameservers();
 324 &show_general_dns_configuration();
 325
 326 &Header::closebigbox();
 327 &Header::closepage();
 328
 329 ###
 330 # General DNS-Servers sektion.
 331 #
 332 sub show_general_dns_configuration () {
 333         &Header::openbox('100%', 'center', "$Lang::tr{'dns configuration'}");
 334
 335         print <<END;
 336         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 337                 <table width="100%">
 338                         <tr>
 339                                 <td width="33%">
 340                                         $Lang::tr{'dns use isp assigned nameservers'}
 341                                 </td>
 342
 343                                 <td>
 344                                         <input type="checkbox" name="USE_ISP_NAMESERVERS" $checked{'USE_ISP_NAMESERVERS'}{'on'}>
 345                                 </td>
 346                         </tr>
 347
 348                         <tr>
 349                                 <td colspan="2">
 350                                         <br>
 351                                 </td>
 352                         </tr>
 353
 354                         <tr>
 355                                 <td width="33%">
 356                                         $Lang::tr{'dns use protocol for dns queries'}
 357                                 </td>
 358
 359                                 <td>
 360                                         <select name="PROTO">
 361                                                 <option value="UDP" $selected{'PROTO'}{'UDP'}>UDP</option>
 362                                                 <option value="TLS" $selected{'PROTO'}{'TLS'}>TLS</option>
 363                                                 <option value="TCP" $selected{'PROTO'}{'TCP'}>TCP</option>
 364                                         </select>
 365                                 </td>
 366                         </tr>
 367
 368                         <tr>
 369                                 <td colspan="2">
 370                                         <br>
 371                                 </td>
 372                         </tr>
 373
 374                         <tr>
 375                                 <td width="33%">
 376                                         $Lang::tr{'dns enable safe-search'}
 377                                 </td>
 378
 379                                 <td>
 380                                         <input type="checkbox" name="ENABLE_SAFE_SEARCH" $checked{'ENABLE_SAFE_SEARCH'}{'on'}>
 381                                 </td>
 382                         </tr>
 383
 384                         <tr>
 385                                 <td colspan="2">
 386                                         <br>
 387                                 </td>
 388                         </tr>
 389
 390                         <tr>
 391                                 <td width="33%">
 392                                         $Lang::tr{'dns mode for qname minimisation'}
 393                                 </td>
 394
 395                                 <td>
 396                                         <select name="QNAME_MIN">
 397                                                 <option value="standard" $selected{'QNAME_MIN'}{'standard'}>$Lang::tr{'standard'}</option>
 398                                                 <option value="strict" $selected{'QNAME_MIN'}{'strict'}>$Lang::tr{'strict'}</option>
 399                                         </select>
 400                                 </td>
 401                         </tr>
 402
 403                         <tr>
 404                                 <td colspan="2" align="right">
 405                                         <input type="submit" name="GENERAL" value="$Lang::tr{'save'}">
 406                                 </td>
 407                         </tr>
 408                 </table>
 409         </form>
 410 END
 411
 412         &Header::closebox();
 413 }
 414
 415 ###
 416 # Section to display the configured and used DNS servers.
 417 #
 418 sub show_nameservers () {
 419         &Header::openbox('100%', 'center', "$Lang::tr{'dns title'}");
 420
 421         # Determine if we are running in recursor mode
 422         my $recursor = 0;
 423         my $unbound_forward = qx(unbound-control forward);
 424         if ($unbound_forward =~ m/^off/) {
 425                 $recursor = 1;
 426         }
 427
 428         my $dns_status_string;
 429         my $dns_status_col;
 430         my $dns_working;
 431
 432
 433         # Test if the DNS system is working.
 434         #
 435         # Simple send a request to unbound and check if it can resolve the
 436         # DNS test server.
 437         my $dns_status_ret = &check_nameserver("127.0.0.1", "$dns_test_server", "UDP", undef, "+timeout=5", "+retry=0");
 438
 439         if ($dns_status_ret eq "2") {
 440                 $dns_status_string = "$Lang::tr{'working'}";
 441                 $dns_status_col = "${Header::colourgreen}";
 442                 $dns_working = 1;
 443         } else {
 444                 $dns_status_string = "$Lang::tr{'broken'}";
 445                 $dns_status_col = "${Header::colourred}";
 446         }
 447
 448         if ($recursor) {
 449                 $dns_status_string .= " (" . $Lang::tr{'dns recursor mode'} . ")";
 450         }
 451
 452 print <<END;
 453                 <table width='100%'>
 454                         <tr>
 455                                 <td>
 456                                         <strong>$Lang::tr{'status'}:&nbsp;</strong>
 457                                         <strong><font color='$dns_status_col'>$dns_status_string</font></strong>
 458                                 </td>
 459                         </tr>
 460                 </table>
 461
 462                 <br>
 463
 464                 <table class="tbl" width='100%'>
 465                         <tr>
 466                                 <td align="center">
 467                                         <strong>$Lang::tr{'nameserver'}</strong>
 468                                 </td>
 469
 470                                 <td align="center">
 471                                         <strong>$Lang::tr{'country'}</strong>
 472                                 </td>
 473
 474                                 <td align="center">
 475                                         <strong>$Lang::tr{'rdns'}</strong>
 476                                 </td>
 477
 478                                 <td align="center">
 479                                         <strong>$Lang::tr{'remark'}</strong>
 480                                 </td>
 481 END
 482         # Check if the status should be displayed.
 483         if ($check_servers) {
 484 print <<END
 485                                 <td align="center">
 486                                         <strong>$Lang::tr{'status'}</strong>
 487                                 </td>
 488 END
 489 ;
 490         }
 491
 492 print <<END
 493
 494                                 <td align="center" colspan="3">
 495                                         <strong>$Lang::tr{'action'}</strong>
 496                                 </td>
 497                         </tr>
 498 END
 499 ;
 500
 501                 # Check the usage of ISP assigned nameservers is enabled.
 502                 my $id = 1;
 503
 504                 # Loop through the array which stores the files.
 505                 foreach my $file (@ISP_nameserver_files) {
 506                         # Grab the address of the nameserver.
 507                         my $address = &General::grab_address_from_file($file);
 508
 509                         # Check if we got an address.
 510                         if ($address) {
 511                                 # Add the address to the hash of nameservers.
 512                                 $dns_servers{$id} = [ "$address", "none",
 513                                         ($settings{'USE_ISP_NAMESERVERS'} eq "on") ? "enabled" : "disabled",
 514                                         "$Lang::tr{'dns isp assigned nameserver'}" ];
 515
 516                                 # Increase id by one.
 517                                 $id++;
 518                         }
 519                 }
 520
 521                 # Check some DNS servers have been configured. In this case
 522                 # the hash contains at least one key.
 523                 my $server_amount;
 524                 if (keys %dns_servers) {
 525                         # Sort the keys by their ID and store them in an array.
 526                         my @keys = sort { $a <=> $b } keys %dns_servers;
 527
 528                         # Loop through all entries of the array/hash.
 529                         foreach my $id (@keys) {
 530                                 # Inrease server_amount.
 531                                 $server_amount++;
 532
 533                                 # Assign data array positions to some nice variable names.
 534                                 my $nameserver = $dns_servers{$id}[0];
 535                                 my $tls_hostname = $dns_servers{$id}[1];
 536                                 my $enabled = $dns_servers{$id}[2];
 537                                 my $remark = $dns_servers{$id}[3];
 538
 539                                 my $col = '';
 540                                 my $toggle = '';
 541                                 my $gif = '';
 542                                 my $gdesc = '';
 543                                 my $notice = "";
 544
 545                                 # Colorize columns.
 546                                 if ($server_amount % 2) {
 547                                         $col="bgcolor='$color{'color22'}'"; }
 548                                 else {
 549                                         $col="bgcolor='$color{'color20'}'";
 550                                 }
 551
 552                                 if ($enabled eq 'enabled') {
 553                                         $gif='on.gif'; $toggle='off'; $gdesc=$Lang::tr{'click to disable'};
 554                                 } else {
 555                                         $gif='off.gif'; $toggle='on'; $gdesc=$Lang::tr{'click to enable'};
 556                                 }
 557
 558                                 my $status;
 559                                 my $status_short;
 560                                 my $status_message;
 561                                 my $status_colour;
 562
 563                                 # Only grab the status if the nameserver is enabled.
 564                                 if (($check_servers) && ($enabled eq "enabled")) {
 565                                         $status = &check_nameserver("$nameserver", "ping.ipfire.org", "$settings{'PROTO'}", "$tls_hostname");
 566                                 }
 567
 568                                 if (!defined $status) {
 569                                         $status_short = "$Lang::tr{'disabled'}";
 570
 571                                 # DNSSEC Not supported
 572                                 } elsif ($status eq 0) {
 573                                         $status_short = "$Lang::tr{'broken'}";
 574                                         $status_message = $Lang::tr{'dnssec not supported'};
 575                                         $status_colour = ${Header::colourred};
 576
 577                                 # DNSSEC Aware
 578                                 } elsif ($status eq 1) {
 579                                         $status_short = "$Lang::tr{'not validating'}";
 580                                         $status_message = $Lang::tr{'dnssec aware'};
 581                                         $status_colour = ${Header::colourblack};
 582
 583                                 # DNSSEC Validating
 584                                 } elsif ($status eq 2) {
 585                                         $status_short = "$Lang::tr{'ok'}";
 586                                         $status_message = $Lang::tr{'dnssec validating'};
 587                                         $status_colour = ${Header::colourgreen};
 588
 589                                 # Error
 590                                 } else {
 591                                         $status_short = "$Lang::tr{'error'}";
 592                                         $status_message = $status;
 593                                         $status_colour = ${Header::colourred};
 594                                 }
 595
 596                                 # collect more information about name server (rDNS, GeoIP country code)
 597                                 my $ccode = &GeoIP::lookup($nameserver);
 598                                 my $flag_icon = &GeoIP::get_flag_icon($ccode);
 599
 600                                 my $rdns;
 601
 602                                 # Only do the reverse lookup if the system is online.
 603                                 if ($dns_working) {
 604                                         my $iaddr = inet_aton($nameserver);
 605                                         $rdns = gethostbyaddr($iaddr, AF_INET);
 606                                 }
 607
 608                                 if (!$rdns) { $rdns = $Lang::tr{'lookup failed'}; }
 609
 610                                 # Mark ISP name servers as disabled
 611                                 if ($id <= 2 && $enabled eq "disabled") {
 612                                         $nameserver = "<del>$nameserver</del>";
 613                                 }
 614
 615 print <<END;
 616                         <tr>
 617                                 <td align="center" $col>
 618                                         $nameserver
 619                                 </td>
 620
 621                                 <td align="center" $col>
 622                                         <a href='country.cgi#$ccode'><img src="$flag_icon" border="0" alt="$ccode" title="$ccode" /></a>
 623                                 </td>
 624
 625                                 <td align="center" $col>
 626                                         $rdns
 627                                 </td>
 628
 629                                 <td align="center" $col>
 630                                         $remark
 631                                 </td>
 632 END
 633 ;
 634                                 # Display server status if requested.
 635                                 if ($check_servers) {
 636 print <<END
 637                                         <td align="center" $col>
 638                                                 <strong><font color="$status_colour"><abbr title="$status_message">$status_short</abbr></font></strong>
 639                                         </td>
 640 END
 641 ;
 642                                 }
 643
 644                                 # Check if the id is greater than "2".
 645                                 #
 646                                 # Nameservers with an ID's of one or two are ISP assigned,
 647                                 # and we cannot perform any actions on them, so hide the tools for
 648                                 # them.
 649                                 if ($id > 2) {
 650
 651 print <<END;
 652                                         <td align='center' width='5%' $col>
 653                                                 <form method='post' name='frma$id' action='$ENV{'SCRIPT_NAME'}'>
 654                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' title='$gdesc' alt='$gdesc' />
 655                                                         <input type='hidden' name='ID' value='$id' />
 656                                                         <input type='hidden' name='ENABLE' value='$toggle' />
 657                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'toggle enable disable'}' />
 658                                                 </form>
 659                                         </td>
 660
 661                                         <td align='center' width='5%' $col>
 662                                                 <form method='post' name='frmb$id' action='$ENV{'SCRIPT_NAME'}'>
 663                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' title='$Lang::tr{'edit'}' alt='$Lang::tr{'edit'}' />
 664                                                         <input type='hidden' name='ID' value='$id' />
 665                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'edit'}' />
 666                                                 </form>
 667                                         </td>
 668
 669                                         <td align='center' width='5%' $col>
 670                                                 <form method='post' name='frmc$id' action='$ENV{'SCRIPT_NAME'}'>
 671                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}' />
 672                                                         <input type='hidden' name='ID' value='$id' />
 673                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'remove'}' />
 674                                                 </form>
 675                                         </td>
 676 END
 677 ;
 678                         } else {
 679                                         print "<td colspan='3' $col>&nbsp;</td>\n";
 680                         }
 681
 682
 683                         print"</tr>\n";
 684
 685                 }
 686
 687                 print"</table>\n";
 688
 689                 print"<table width='100%'>\n";
 690
 691                 # Check if the usage of the ISP nameservers is enabled and there are more than 2 servers.
 692                 if (($settings{'USE_ISP_NAMESERVERS'} eq "on") && ($server_amount > 2)) {
 693 print <<END;
 694                         <tr>
 695                                 <td class='boldbase'>&nbsp; <b>$Lang::tr{'legend'}:</b></td>
 696                                 <td>&nbsp; <img src='/images/on.gif' alt='$Lang::tr{'click to disable'}' /></td>
 697                                 <td class='base'>$Lang::tr{'click to disable'}</td>
 698                                 <td>&nbsp; &nbsp; <img src='/images/off.gif' alt='$Lang::tr{'click to enable'}' /></td>
 699                                 <td class='base'>$Lang::tr{'click to enable'}</td>
 700                                 <td>&nbsp; &nbsp; <img src='/images/edit.gif' alt='$Lang::tr{'edit'}' /></td>
 701                                 <td class='base'>$Lang::tr{'edit'}</td>
 702                                 <td>&nbsp; &nbsp; <img src='/images/delete.gif' alt='$Lang::tr{'remove'}' /></td>
 703                                 <td class='base'>$Lang::tr{'remove'}</td>
 704                         </tr>
 705 END
 706 ;
 707                 }
 708 print <<END;
 709                         <tr>
 710                                 <form method="post" action="$ENV{'SCRIPT_NAME'}">
 711                                         <td colspan="9" align="right">
 712                                                 <input type="submit" name="SERVERS" value="$Lang::tr{'add'}">
 713                                                 <input type="submit" name="SERVERS" value="$Lang::tr{'dns check servers'}">
 714                                         </td>
 715                                 </form>
 716                         </tr>
 717                 </table>
 718 END
 719 ;
 720                 } else {
 721                         print <<END;
 722                 <table width="100%">
 723                         <tr>
 724                                 <form method="post" action="$ENV{'SCRIPT_NAME'}">
 725                                         <td colspan="6" align="right"><input type="submit" name="SERVERS" value="$Lang::tr{'add'}"></td>
 726                                 </form>
 727                         </tr>
 728                 </table>
 729 END
 730                 }
 731
 732         &Header::closebox();
 733 }
 734
 735 ###
 736 # Section to display the add or edit subpage.
 737 #
 738 sub show_add_edit_nameserver() {
 739         print "<form method='post' action='$ENV{'SCRIPT_NAME'}'>\n";
 740
 741         my $buttontext = $Lang::tr{'save'};
 742         my $dnssec_checked;
 743         my $dot_checked;
 744         if ($cgiparams{'SERVERS'} eq $Lang::tr{'edit'}) {
 745                 &Header::openbox('100%', 'left', $Lang::tr{'dnsforward edit an entry'});
 746
 747                 # Update button text for upate the existing entry.
 748                 $buttontext = $Lang::tr{'update'};
 749
 750                 # Add hidden input for sending ID.
 751                 print"<input type='hidden' name='ID' value='$cgiparams{'ID'}'>\n";
 752
 753                 # Check if an ID has been given.
 754                 if ($cgiparams{'ID'}) {
 755                         # Assign cgiparams values.
 756                         $cgiparams{'NAMESERVER'} = $dns_servers{$cgiparams{'ID'}}[0];
 757                         $cgiparams{'TLS_HOSTNAME'} = $dns_servers{$cgiparams{'ID'}}[1];
 758                         $cgiparams{'REMARK'} = $dns_servers{$cgiparams{'ID'}}[3];
 759                 }
 760         } else {
 761                 &Header::openbox('100%', 'left', $Lang::tr{'dnsforward add a new entry'});
 762         }
 763
 764         my $tls_required_image;
 765
 766         # If the protocol is TLS, dispaly the required image.
 767         if ($settings{'PROTO'} eq "TLS") {
 768                 $tls_required_image = "<img src='/blob.gif' alt='*'>";
 769         }
 770
 771         # Add hidden input to store the mode.
 772         print "<input type='hidden' name='MODE' value='$cgiparams{'SERVERS'}'>\n";
 773
 774 print <<END
 775         <table width='100%'>
 776                 <tr>
 777                         <td width='20%' class='base'>$Lang::tr{'ip address'}:&nbsp;<img src='/blob.gif' alt='*' /></td>
 778                         <td><input type='text' name='NAMESERVER' value='$cgiparams{"NAMESERVER"}' size='24' /></td>
 779                 </tr>
 780
 781
 782                 <tr>
 783                         <td width='20%' class='base'>$Lang::tr{'dns tls hostname'}:&nbsp;$tls_required_image</td>
 784                         <td><input type='text' name='TLS_HOSTNAME' value='$cgiparams{'TLS_HOSTNAME'}' size='24'></td>
 785                 </tr>
 786
 787
 788                 <tr>
 789                         <td width ='20%' class='base'>$Lang::tr{'remark'}:</td>
 790                         <td><input type='text' name='REMARK' value='$cgiparams{'REMARK'}' size='40' maxlength='50' /></td>
 791                 </tr>
 792         </table>
 793
 794         <br>
 795         <hr>
 796
 797         <table width='100%'>
 798                 <tr>
 799                         <td class='base' width='55%'><img src='/blob.gif' alt ='*' align='top' />&nbsp;$Lang::tr{'required field'}</td>
 800                         <td width='40%' align='right'>
 801                                 <input type="submit" name="SERVERS" value="$buttontext">
 802                                 <input type="submit" name="SERVERS" value="$Lang::tr{'back'}">
 803                         </td>
 804                 </tr>
 805         </table>
 806 END
 807 ;
 808
 809         &Header::closebox();
 810         print "</form>\n";
 811
 812         &Header::closebox();
 813 }
 814
 815 # Private function to handle the restart of unbound and more.
 816 sub _handle_unbound_and_more () {
 817         # Restart unbound
 818         system('/usr/local/bin/unboundctrl reload >/dev/null');
 819
 820         # Check if the IDS is running.
 821         if(&IDS::ids_is_running()) {
 822                 # Re-generate the file which contains the DNS Server
 823                 # details.
 824                 &IDS::generate_dns_servers_file();
 825
 826                 # Call suricatactrl to perform a reload.
 827                 &IDS::call_suricatactrl("restart");
 828         }
 829 }
 830
 831 # Check if the system is online (RED is connected).
 832 sub red_is_active () {
 833         # Check if the "active" file is present.
 834         if ( -f "${General::swroot}/red/active") {
 835                 # Return "1" - True.
 836                 return 1;
 837         } else {
 838                 # Return nothing - False.
 839                 return;
 840         }
 841 }
 842
 843 # Function to check a given nameserver against propper work.
 844 sub check_nameserver($$$$$) {
 845         my ($nameserver, $record, $proto, $tls_hostname, @args) = @_;
 846
 847         # Check if the system is online.
 848         unless (&red_is_active()) {
 849                 return "$Lang::tr{'system is offline'}";
 850         }
 851
 852         # Default values.
 853         my @command = ("kdig", "+dnssec",
 854                 "+bufsize=1232", @args);
 855
 856         # Handle different protols.
 857         if ($proto eq "TCP") {
 858                 # Add TCP switch to the command.
 859                 push(@command, "+tcp");
 860
 861         } elsif($proto eq "TLS") {
 862                 # Add TLS switch to the command and provide the
 863                 # path to our file which contains the ca certs.
 864                 push(@command, "+tls-ca=$ca_certs_file");
 865
 866                 # Check if a TLS hostname has been provided.
 867                 if ($tls_hostname) {
 868                         # Add TLS hostname to the command.
 869                         push(@command, "+tls-hostname=$tls_hostname");
 870                 } else {
 871                         return "$Lang::tr{'dns no tls hostname given'}";
 872                 }
 873         }
 874
 875         # Add record to the command array.
 876         push(@command, "$record");
 877
 878         # Add nameserver to the command array.
 879         push(@command, "\@$nameserver");
 880
 881         # Connect to STDOUT and STDERR.
 882         push(@command, "2>&1");
 883
 884         my @output = qx(@command);
 885         my $output = join("", @output);
 886
 887         my $status = 0;
 888
 889         if ($output =~ m/status: (\w+)/) {
 890                 $status = ($1 eq "NOERROR");
 891
 892                 if (!$status) {
 893                         return -1;
 894                 }
 895         } else {
 896                 my $warning;
 897
 898                 while ($output =~ m/WARNING: (.*)/g) {
 899                         # Add the current grabbed warning to the warning string.
 900                         $warning .= "$1\; ";
 901                 }
 902
 903                 # Return the warning string, if we grabbed at least one.
 904                 if ($warning) {
 905                         return $warning;
 906                 }
 907         }
 908
 909         my @flags = ();
 910         if ($output =~ m/Flags: (.*);/) {
 911                 @flags = split(/ /, $1);
 912         }
 913
 914         my $aware = ($output =~ m/RRSIG/);
 915         my $validating = (grep(/ad;/, @flags));
 916
 917         return $aware + $validating;
 918 }