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