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