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 "${General::swroot}/location-functions.pl";
  31 require "${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 # Libloc database handle
 273 my $libloc_db_handle = &Location::Functions::init();
 274
 275 &Header::openpage($Lang::tr{'dns'}, 1, '');
 276
 277 &Header::openbigbox('100%', 'left', '', $errormessage);
 278
 279 ###
 280 # Error messages layout.
 281 #
 282 if ($errormessage) {
 283         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 284         print "<class name='base'>$errormessage\n";
 285         print "&nbsp;</class>\n";
 286         &Header::closebox();
 287 }
 288
 289 # Handle if a nameserver should be added or edited.
 290 if (($cgiparams{'SERVERS'} eq "$Lang::tr{'add'}") || ($cgiparams{'SERVERS'} eq "$Lang::tr{'edit'}")) {
 291         # Display the sub page.
 292         &show_add_edit_nameserver();
 293
 294         # Close webpage.
 295         &Header::closebigbox();
 296         &Header::closepage();
 297
 298         # Finished here for the moment.
 299         exit(0);
 300 }
 301
 302 $cgiparams{'GENERAL'} = '';
 303 $cgiparams{'SERVERS'} = '';
 304 $cgiparams{'NAMESERVER'} = '';
 305 $cgiparams{'TLS_HOSTNAME'} = '';
 306 $cgiparams{'REMARK'} ='';
 307
 308 $checked{'USE_ISP_NAMESERVERS'}{'off'} = '';
 309 $checked{'USE_ISP_NAMESERVERS'}{'on'} = '';
 310 $checked{'USE_ISP_NAMESERVERS'}{$settings{'USE_ISP_NAMESERVERS'}} = "checked='checked'";
 311
 312 $checked{'ENABLE_SAFE_SEARCH'}{'off'} = '';
 313 $checked{'ENABLE_SAFE_SEARCH'}{'on'} = '';
 314 $checked{'ENABLE_SAFE_SEARCH'}{$settings{'ENABLE_SAFE_SEARCH'}} = "checked='checked'";
 315
 316 $selected{'PROTO'}{'UDP'} = '';
 317 $selected{'PROTO'}{'TLS'} = '';
 318 $selected{'PROTO'}{'TCP'} = '';
 319 $selected{'PROTO'}{$settings{'PROTO'}} = "selected='selected'";
 320
 321 $selected{'QNAME_MIN'}{'standard'} = '';
 322 $selected{'QNAME_MIN'}{'strict'} = '';
 323 $selected{'QNAME_MIN'}{$settings{'QNAME_MIN'}} = "selected='selected'";
 324
 325 # Display nameserver and configuration sections.
 326 &show_nameservers();
 327 &show_general_dns_configuration();
 328
 329 &Header::closebigbox();
 330 &Header::closepage();
 331
 332 ###
 333 # General DNS-Servers sektion.
 334 #
 335 sub show_general_dns_configuration () {
 336         &Header::openbox('100%', 'center', "$Lang::tr{'dns configuration'}");
 337
 338         print <<END;
 339         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 340                 <table width="100%">
 341                         <tr>
 342                                 <td width="33%">
 343                                         $Lang::tr{'dns use isp assigned nameservers'}
 344                                 </td>
 345
 346                                 <td>
 347                                         <input type="checkbox" name="USE_ISP_NAMESERVERS" $checked{'USE_ISP_NAMESERVERS'}{'on'}>
 348                                 </td>
 349                         </tr>
 350
 351                         <tr>
 352                                 <td colspan="2">
 353                                         <br>
 354                                 </td>
 355                         </tr>
 356
 357                         <tr>
 358                                 <td width="33%">
 359                                         $Lang::tr{'dns use protocol for dns queries'}
 360                                 </td>
 361
 362                                 <td>
 363                                         <select name="PROTO">
 364                                                 <option value="UDP" $selected{'PROTO'}{'UDP'}>UDP</option>
 365                                                 <option value="TLS" $selected{'PROTO'}{'TLS'}>TLS</option>
 366                                                 <option value="TCP" $selected{'PROTO'}{'TCP'}>TCP</option>
 367                                         </select>
 368                                 </td>
 369                         </tr>
 370
 371                         <tr>
 372                                 <td colspan="2">
 373                                         <br>
 374                                 </td>
 375                         </tr>
 376
 377                         <tr>
 378                                 <td width="33%">
 379                                         $Lang::tr{'dns enable safe-search'}
 380                                 </td>
 381
 382                                 <td>
 383                                         <input type="checkbox" name="ENABLE_SAFE_SEARCH" $checked{'ENABLE_SAFE_SEARCH'}{'on'}>
 384                                 </td>
 385                         </tr>
 386
 387                         <tr>
 388                                 <td colspan="2">
 389                                         <br>
 390                                 </td>
 391                         </tr>
 392
 393                         <tr>
 394                                 <td width="33%">
 395                                         $Lang::tr{'dns mode for qname minimisation'}
 396                                 </td>
 397
 398                                 <td>
 399                                         <select name="QNAME_MIN">
 400                                                 <option value="standard" $selected{'QNAME_MIN'}{'standard'}>$Lang::tr{'standard'}</option>
 401                                                 <option value="strict" $selected{'QNAME_MIN'}{'strict'}>$Lang::tr{'strict'}</option>
 402                                         </select>
 403                                 </td>
 404                         </tr>
 405
 406                         <tr>
 407                                 <td colspan="2" align="right">
 408                                         <input type="submit" name="GENERAL" value="$Lang::tr{'save'}">
 409                                 </td>
 410                         </tr>
 411                 </table>
 412         </form>
 413 END
 414
 415         &Header::closebox();
 416 }
 417
 418 ###
 419 # Section to display the configured and used DNS servers.
 420 #
 421 sub show_nameservers () {
 422         &Header::openbox('100%', 'center', "$Lang::tr{'dns title'}");
 423
 424         # Determine if we are running in recursor mode
 425         my $recursor = 0;
 426         my $unbound_forward = qx(unbound-control forward);
 427         if ($unbound_forward =~ m/^off/) {
 428                 $recursor = 1;
 429         }
 430
 431         my $dns_status_string;
 432         my $dns_status_col;
 433         my $dns_working;
 434
 435
 436         # Test if the DNS system is working.
 437         #
 438         # Simple send a request to unbound and check if it can resolve the
 439         # DNS test server.
 440         my $dns_status_ret = &check_nameserver("127.0.0.1", "$dns_test_server", "UDP", undef, "+timeout=5", "+retry=0");
 441
 442         if ($dns_status_ret eq "2") {
 443                 $dns_status_string = "$Lang::tr{'working'}";
 444                 $dns_status_col = "${Header::colourgreen}";
 445                 $dns_working = 1;
 446         } else {
 447                 $dns_status_string = "$Lang::tr{'broken'}";
 448                 $dns_status_col = "${Header::colourred}";
 449         }
 450
 451         if ($recursor) {
 452                 $dns_status_string .= " (" . $Lang::tr{'dns recursor mode'} . ")";
 453         }
 454
 455         print <<END;
 456                 <table width='100%'>
 457                         <tr>
 458                                 <td>
 459                                         <strong>$Lang::tr{'status'}:&nbsp;</strong>
 460                                         <strong><font color='$dns_status_col'>$dns_status_string</font></strong>
 461                                 </td>
 462                         </tr>
 463                 </table>
 464 END
 465
 466         # Check the usage of ISP assigned nameservers is enabled.
 467         my $id = 1;
 468
 469         # Loop through the array which stores the files.
 470         foreach my $file (@ISP_nameserver_files) {
 471                 # Grab the address of the nameserver.
 472                 my $address = &General::grab_address_from_file($file);
 473
 474                 # Check if we got an address.
 475                 if ($address) {
 476                         # Add the address to the hash of nameservers.
 477                         $dns_servers{$id} = [ "$address", "none",
 478                                 ($settings{'USE_ISP_NAMESERVERS'} eq "on") ? "enabled" : "disabled",
 479                                 "$Lang::tr{'dns isp assigned nameserver'}" ];
 480
 481                         # Increase id by one.
 482                         $id++;
 483                 }
 484         }
 485
 486         # Check some DNS servers have been configured. In this case
 487         # the hash contains at least one key.
 488         my $server_amount;
 489         if (keys %dns_servers) {
 490                 # Sort the keys by their ID and store them in an array.
 491                 my @keys = sort { $a <=> $b } keys %dns_servers;
 492
 493                 print <<END;
 494                 <br>
 495
 496                 <table class="tbl" width='100%'>
 497                         <tr>
 498                                 <td align="center">
 499                                         <strong>$Lang::tr{'nameserver'}</strong>
 500                                 </td>
 501
 502                                 <td align="center">
 503                                         <strong>$Lang::tr{'country'}</strong>
 504                                 </td>
 505
 506                                 <td align="center">
 507                                         <strong>$Lang::tr{'rdns'}</strong>
 508                                 </td>
 509
 510                                 <td align="center">
 511                                         <strong>$Lang::tr{'remark'}</strong>
 512                                 </td>
 513 END
 514
 515                 # Check if the status should be displayed.
 516                 if ($check_servers) {
 517                         print <<END;
 518                                 <td align="center">
 519                                         <strong>$Lang::tr{'status'}</strong>
 520                                 </td>
 521 END
 522                 }
 523
 524                 print <<END;
 525
 526                                 <td align="center" colspan="3">
 527                                         <strong>$Lang::tr{'action'}</strong>
 528                                 </td>
 529                         </tr>
 530 END
 531
 532                         # Loop through all entries of the array/hash.
 533                         foreach my $id (@keys) {
 534                                 # Inrease server_amount.
 535                                 $server_amount++;
 536
 537                                 # Assign data array positions to some nice variable names.
 538                                 my $nameserver = $dns_servers{$id}[0];
 539                                 my $tls_hostname = $dns_servers{$id}[1];
 540                                 my $enabled = $dns_servers{$id}[2];
 541                                 my $remark = $dns_servers{$id}[3];
 542
 543                                 my $col = '';
 544                                 my $toggle = '';
 545                                 my $gif = '';
 546                                 my $gdesc = '';
 547                                 my $notice = "";
 548
 549                                 # Colorize columns.
 550                                 if ($server_amount % 2) {
 551                                         $col="bgcolor='$color{'color22'}'"; }
 552                                 else {
 553                                         $col="bgcolor='$color{'color20'}'";
 554                                 }
 555
 556                                 if ($enabled eq 'enabled') {
 557                                         $gif='on.gif'; $toggle='off'; $gdesc=$Lang::tr{'click to disable'};
 558                                 } else {
 559                                         $gif='off.gif'; $toggle='on'; $gdesc=$Lang::tr{'click to enable'};
 560                                 }
 561
 562                                 my $status;
 563                                 my $status_short;
 564                                 my $status_message;
 565                                 my $status_colour;
 566
 567                                 # Only grab the status if the nameserver is enabled.
 568                                 if (($check_servers) && ($enabled eq "enabled")) {
 569                                         $status = &check_nameserver("$nameserver", "ping.ipfire.org", "$settings{'PROTO'}", "$tls_hostname");
 570                                 }
 571
 572                                 if (!defined $status) {
 573                                         $status_short = "$Lang::tr{'disabled'}";
 574
 575                                 # DNSSEC Not supported
 576                                 } elsif ($status eq 0) {
 577                                         $status_short = "$Lang::tr{'broken'}";
 578                                         $status_message = $Lang::tr{'dnssec not supported'};
 579                                         $status_colour = ${Header::colourred};
 580
 581                                 # DNSSEC Aware
 582                                 } elsif ($status eq 1) {
 583                                         $status_short = "$Lang::tr{'not validating'}";
 584                                         $status_message = $Lang::tr{'dnssec aware'};
 585                                         $status_colour = ${Header::colourblack};
 586
 587                                 # DNSSEC Validating
 588                                 } elsif ($status eq 2) {
 589                                         $status_short = "$Lang::tr{'ok'}";
 590                                         $status_message = $Lang::tr{'dnssec validating'};
 591                                         $status_colour = ${Header::colourgreen};
 592
 593                                 # Error
 594                                 } else {
 595                                         $status_short = "$Lang::tr{'error'}";
 596                                         $status_message = $status;
 597                                         $status_colour = ${Header::colourred};
 598                                 }
 599
 600                                 # collect more information about name server (rDNS, country code)
 601                                 my $ccode = &Location::Functions::lookup_country_code($libloc_db_handle, $nameserver);
 602                                 my $flag_icon = &Location::Functions::get_flag_icon($ccode);
 603
 604                                 my $rdns;
 605
 606                                 # Only do the reverse lookup if the system is online.
 607                                 if ($dns_working) {
 608                                         my $iaddr = inet_aton($nameserver);
 609                                         $rdns = gethostbyaddr($iaddr, AF_INET);
 610                                 }
 611
 612                                 if (!$rdns) { $rdns = $Lang::tr{'lookup failed'}; }
 613
 614                                 # Mark ISP name servers as disabled
 615                                 if ($id <= 2 && $enabled eq "disabled") {
 616                                         $nameserver = "<del>$nameserver</del>";
 617                                 }
 618
 619 print <<END;
 620                         <tr>
 621                                 <td align="center" $col>
 622                                         $nameserver
 623                                 </td>
 624
 625                                 <td align="center" $col>
 626                                         <a href='country.cgi#$ccode'><img src="$flag_icon" border="0" alt="$ccode" title="$ccode" /></a>
 627                                 </td>
 628
 629                                 <td align="center" $col>
 630                                         $rdns
 631                                 </td>
 632
 633                                 <td align="center" $col>
 634                                         $remark
 635                                 </td>
 636 END
 637 ;
 638                                 # Display server status if requested.
 639                                 if ($check_servers) {
 640 print <<END
 641                                         <td align="center" $col>
 642                                                 <strong><font color="$status_colour"><abbr title="$status_message">$status_short</abbr></font></strong>
 643                                         </td>
 644 END
 645 ;
 646                                 }
 647
 648                                 # Check if the id is greater than "2".
 649                                 #
 650                                 # Nameservers with an ID's of one or two are ISP assigned,
 651                                 # and we cannot perform any actions on them, so hide the tools for
 652                                 # them.
 653                                 if ($id > 2) {
 654
 655 print <<END;
 656                                         <td align='center' width='5%' $col>
 657                                                 <form method='post' name='frma$id' action='$ENV{'SCRIPT_NAME'}'>
 658                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' title='$gdesc' alt='$gdesc' />
 659                                                         <input type='hidden' name='ID' value='$id' />
 660                                                         <input type='hidden' name='ENABLE' value='$toggle' />
 661                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'toggle enable disable'}' />
 662                                                 </form>
 663                                         </td>
 664
 665                                         <td align='center' width='5%' $col>
 666                                                 <form method='post' name='frmb$id' action='$ENV{'SCRIPT_NAME'}'>
 667                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' title='$Lang::tr{'edit'}' alt='$Lang::tr{'edit'}' />
 668                                                         <input type='hidden' name='ID' value='$id' />
 669                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'edit'}' />
 670                                                 </form>
 671                                         </td>
 672
 673                                         <td align='center' width='5%' $col>
 674                                                 <form method='post' name='frmc$id' action='$ENV{'SCRIPT_NAME'}'>
 675                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}' />
 676                                                         <input type='hidden' name='ID' value='$id' />
 677                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'remove'}' />
 678                                                 </form>
 679                                         </td>
 680 END
 681 ;
 682                         } else {
 683                                         print "<td colspan='3' $col>&nbsp;</td>\n";
 684                         }
 685
 686
 687                         print"</tr>\n";
 688
 689                 }
 690
 691                 print"</table>\n";
 692
 693                 print"<table width='100%'>\n";
 694
 695                 # Check if the usage of the ISP nameservers is enabled and there are more than 2 servers.
 696                 if (($settings{'USE_ISP_NAMESERVERS'} eq "on") && ($server_amount > 2)) {
 697 print <<END;
 698                         <tr>
 699                                 <td class='boldbase'>&nbsp; <b>$Lang::tr{'legend'}:</b></td>
 700                                 <td>&nbsp; <img src='/images/on.gif' alt='$Lang::tr{'click to disable'}' /></td>
 701                                 <td class='base'>$Lang::tr{'click to disable'}</td>
 702                                 <td>&nbsp; &nbsp; <img src='/images/off.gif' alt='$Lang::tr{'click to enable'}' /></td>
 703                                 <td class='base'>$Lang::tr{'click to enable'}</td>
 704                                 <td>&nbsp; &nbsp; <img src='/images/edit.gif' alt='$Lang::tr{'edit'}' /></td>
 705                                 <td class='base'>$Lang::tr{'edit'}</td>
 706                                 <td>&nbsp; &nbsp; <img src='/images/delete.gif' alt='$Lang::tr{'remove'}' /></td>
 707                                 <td class='base'>$Lang::tr{'remove'}</td>
 708                         </tr>
 709 END
 710 ;
 711                 }
 712 print <<END;
 713                         <tr>
 714                                 <form method="post" action="$ENV{'SCRIPT_NAME'}">
 715                                         <td colspan="9" align="right">
 716                                                 <input type="submit" name="SERVERS" value="$Lang::tr{'add'}">
 717                                                 <input type="submit" name="SERVERS" value="$Lang::tr{'dns check servers'}">
 718                                         </td>
 719                                 </form>
 720                         </tr>
 721                 </table>
 722 END
 723 ;
 724                 } else {
 725                         print <<END;
 726                 <table width="100%">
 727                         <tr>
 728                                 <form method="post" action="$ENV{'SCRIPT_NAME'}">
 729                                         <td colspan="6" align="right"><input type="submit" name="SERVERS" value="$Lang::tr{'add'}"></td>
 730                                 </form>
 731                         </tr>
 732                 </table>
 733 END
 734                 }
 735
 736         &Header::closebox();
 737 }
 738
 739 ###
 740 # Section to display the add or edit subpage.
 741 #
 742 sub show_add_edit_nameserver() {
 743         print "<form method='post' action='$ENV{'SCRIPT_NAME'}'>\n";
 744
 745         my $buttontext = $Lang::tr{'save'};
 746         my $dnssec_checked;
 747         my $dot_checked;
 748         if ($cgiparams{'SERVERS'} eq $Lang::tr{'edit'}) {
 749                 &Header::openbox('100%', 'left', $Lang::tr{'dnsforward edit an entry'});
 750
 751                 # Update button text for upate the existing entry.
 752                 $buttontext = $Lang::tr{'update'};
 753
 754                 # Add hidden input for sending ID.
 755                 print"<input type='hidden' name='ID' value='$cgiparams{'ID'}'>\n";
 756
 757                 # Check if an ID has been given.
 758                 if ($cgiparams{'ID'}) {
 759                         # Assign cgiparams values.
 760                         $cgiparams{'NAMESERVER'} = $dns_servers{$cgiparams{'ID'}}[0];
 761                         $cgiparams{'TLS_HOSTNAME'} = $dns_servers{$cgiparams{'ID'}}[1];
 762                         $cgiparams{'REMARK'} = $dns_servers{$cgiparams{'ID'}}[3];
 763                 }
 764         } else {
 765                 &Header::openbox('100%', 'left', $Lang::tr{'dnsforward add a new entry'});
 766         }
 767
 768         my $tls_required_image;
 769
 770         # If the protocol is TLS, dispaly the required image.
 771         if ($settings{'PROTO'} eq "TLS") {
 772                 $tls_required_image = "<img src='/blob.gif' alt='*'>";
 773         }
 774
 775         # Add hidden input to store the mode.
 776         print "<input type='hidden' name='MODE' value='$cgiparams{'SERVERS'}'>\n";
 777
 778 print <<END
 779         <table width='100%'>
 780                 <tr>
 781                         <td width='20%' class='base'>$Lang::tr{'ip address'}:&nbsp;<img src='/blob.gif' alt='*' /></td>
 782                         <td><input type='text' name='NAMESERVER' value='$cgiparams{"NAMESERVER"}' size='24' /></td>
 783                 </tr>
 784
 785
 786                 <tr>
 787                         <td width='20%' class='base'>$Lang::tr{'dns tls hostname'}:&nbsp;$tls_required_image</td>
 788                         <td><input type='text' name='TLS_HOSTNAME' value='$cgiparams{'TLS_HOSTNAME'}' size='24'></td>
 789                 </tr>
 790
 791
 792                 <tr>
 793                         <td width ='20%' class='base'>$Lang::tr{'remark'}:</td>
 794                         <td><input type='text' name='REMARK' value='$cgiparams{'REMARK'}' size='40' maxlength='50' /></td>
 795                 </tr>
 796         </table>
 797
 798         <br>
 799         <hr>
 800
 801         <table width='100%'>
 802                 <tr>
 803                         <td class='base' width='55%'><img src='/blob.gif' alt ='*' align='top' />&nbsp;$Lang::tr{'required field'}</td>
 804                         <td width='40%' align='right'>
 805                                 <input type="submit" name="SERVERS" value="$buttontext">
 806                                 <input type="submit" name="SERVERS" value="$Lang::tr{'back'}">
 807                         </td>
 808                 </tr>
 809         </table>
 810 END
 811 ;
 812
 813         &Header::closebox();
 814         print "</form>\n";
 815
 816         &Header::closebox();
 817 }
 818
 819 # Private function to handle the restart of unbound and more.
 820 sub _handle_unbound_and_more () {
 821         # Check if the IDS is running.
 822         if(&IDS::ids_is_running()) {
 823                 # Re-generate the file which contains the DNS Server
 824                 # details.
 825                 &IDS::generate_dns_servers_file();
 826
 827                 # Call suricatactrl to perform a reload.
 828                 &IDS::call_suricatactrl("restart");
 829         }
 830         # Restart unbound
 831         system('/usr/local/bin/unboundctrl reload >/dev/null');
 832 }
 833
 834 # Check if the system is online (RED is connected).
 835 sub red_is_active () {
 836         # Check if the "active" file is present.
 837         if ( -f "${General::swroot}/red/active") {
 838                 # Return "1" - True.
 839                 return 1;
 840         } else {
 841                 # Return nothing - False.
 842                 return;
 843         }
 844 }
 845
 846 # Function to check a given nameserver against propper work.
 847 sub check_nameserver($$$$$) {
 848         my ($nameserver, $record, $proto, $tls_hostname, @args) = @_;
 849
 850         # Check if the system is online.
 851         unless (&red_is_active()) {
 852                 return "$Lang::tr{'system is offline'}";
 853         }
 854
 855         # Default values.
 856         my @command = ("kdig", "+dnssec",
 857                 "+bufsize=1232", @args);
 858
 859         # Handle different protols.
 860         if ($proto eq "TCP") {
 861                 # Add TCP switch to the command.
 862                 push(@command, "+tcp");
 863
 864         } elsif($proto eq "TLS") {
 865                 # Add TLS switch to the command and provide the
 866                 # path to our file which contains the ca certs.
 867                 push(@command, "+tls-ca=$ca_certs_file");
 868
 869                 # Check if a TLS hostname has been provided.
 870                 if ($tls_hostname) {
 871                         # Add TLS hostname to the command.
 872                         push(@command, "+tls-hostname=$tls_hostname");
 873                 } else {
 874                         return "$Lang::tr{'dns no tls hostname given'}";
 875                 }
 876         }
 877
 878         # Add record to the command array.
 879         push(@command, "$record");
 880
 881         # Add nameserver to the command array.
 882         push(@command, "\@$nameserver");
 883
 884         # Connect to STDOUT and STDERR.
 885         push(@command, "2>&1");
 886
 887         my @output = qx(@command);
 888         my $output = join("", @output);
 889
 890         my $status = 0;
 891
 892         if ($output =~ m/status: (\w+)/) {
 893                 $status = ($1 eq "NOERROR");
 894
 895                 if (!$status) {
 896                         return -1;
 897                 }
 898         } else {
 899                 my $warning;
 900
 901                 while ($output =~ m/WARNING: (.*)/g) {
 902                         # Add the current grabbed warning to the warning string.
 903                         $warning .= "$1\; ";
 904                 }
 905
 906                 # Return the warning string, if we grabbed at least one.
 907                 if ($warning) {
 908                         return $warning;
 909                 }
 910         }
 911
 912         my @flags = ();
 913         if ($output =~ m/Flags: (.*);/) {
 914                 @flags = split(/ /, $1);
 915         }
 916
 917         my $aware = ($output =~ m/RRSIG/);
 918         my $validating = (grep(/ad;/, @flags));
 919
 920         return $aware + $validating;
 921 }