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 $servers_file") };
  52
  53 # File which stores the ISP assigned DNS servers.
  54 my @ISP_nameserver_files = ( "${General::swroot}/dns/dns1", "${General::swroot}/dns/dns2" );
  55
  56 # File which contains the ca-certificates.
  57 my $ca_certs_file = "/etc/ssl/certs/ca-bundle.crt";
  58
  59 my %color = ();
  60 my %mainsettings = ();
  61 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  62 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  63
  64 &Header::showhttpheaders();
  65 &Header::getcgihash(\%cgiparams);
  66
  67 ##
  68 # Save general settings.
  69 #
  70 if ($cgiparams{'GENERAL'} eq $Lang::tr{'save'}) {
  71         # Prevent form name from been stored in conf file.
  72         delete $cgiparams{'GENERAL'};
  73
  74         # Add value for non-checked checkbox.
  75         if ($cgiparams{'USE_ISP_NAMESERVERS'} ne "on") {
  76                 $cgiparams{'USE_ISP_NAMESERVERS'} = "off";
  77         }
  78
  79         # Add value for non-checked checkbox.
  80         if ($cgiparams{'ENABLE_SAFE_SEARCH'} ne "on") {
  81                 $cgiparams{'ENABLE_SAFE_SEARCH'} = "off";
  82         }
  83
  84         # Store settings into settings file.
  85         &General::writehash("$settings_file", \%cgiparams);
  86 }
  87
  88 ###
  89 # Add / Edit entries.
  90 #
  91 if (($cgiparams{'SERVERS'} eq $Lang::tr{'save'}) || ($cgiparams{'SERVERS'} eq $Lang::tr{'update'})) {
  92         # Hash to store the generic DNS settings.
  93         my %settings = ();
  94
  95         # Read-in generic settings.
  96         &General::readhash("$settings_file", \%settings);
  97
  98         # Check if the given DNS server is valid.
  99         if(!&General::validip($cgiparams{"NAMESERVER"})) {
 100                 $errormessage = "$Lang::tr{'invalid ip'}: $cgiparams{'NAMESERVER'}";
 101         }
 102
 103         # Check if a TLS is enabled and no TLS_HOSTNAME has benn specified.
 104         elsif($settings{'PROTO'} eq "TLS") {
 105                 unless($cgiparams{"TLS_HOSTNAME"}) {
 106                         $errormessage = "$Lang::tr{'dns no tls hostname given'}";
 107                 } else {
 108                         # Check if the provided domain is valid.
 109                         unless(&General::validfqdn($cgiparams{"TLS_HOSTNAME"})) {
 110                                 $errormessage = "$Lang::tr{'invalid ip or hostname'}: $cgiparams{'TLS_HOSTNAME'}";
 111                         }
 112                 }
 113         }
 114
 115         # Check the nameserver.
 116         my $status = &check_nameserver("$cgiparams{'NAMESERVER'}", "ping.ipfire.org", "$settings{'PROTO'}", "$cgiparams{'TLS_HOSTNAME'}");
 117
 118         # Assign errormessage, if the nameserver does not support dnssec or any other kind of error happened.
 119         if ($status eq "0") {
 120                 $errormessage = "$Lang::tr{'dns could not add server'} $Lang::tr{'dnssec not supported'}";
 121         } elsif (($status ne "1") && ($status ne "2")) {
 122                 $errormessage = "$Lang::tr{'dns could not add server'} $status";
 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
 233 # Hash to store the generic DNS settings.
 234 my %settings = ();
 235
 236 # Read-in general DNS settings.
 237 &General::readhash("$settings_file", \%settings);
 238
 239 # Hash which contains the configured DNS servers.
 240 my %dns_servers = ();
 241
 242 # Read-in config file.
 243 &General::readhasharray("$servers_file", \%dns_servers);
 244
 245 &Header::openpage($Lang::tr{'dns'}, 1, '');
 246
 247 &Header::openbigbox('100%', 'left', '', $errormessage);
 248
 249 ###
 250 # Error messages layout.
 251 #
 252 if ($errormessage) {
 253         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 254         print "<class name='base'>$errormessage\n";
 255         print "&nbsp;</class>\n";
 256         &Header::closebox();
 257 }
 258
 259 # Handle if a nameserver should be added or edited.
 260 if (($cgiparams{'SERVERS'} eq "$Lang::tr{'add'}") || ($cgiparams{'SERVERS'} eq "$Lang::tr{'edit'}")) {
 261         # Display the sub page.
 262         &show_add_edit_nameserver();
 263
 264         # Close webpage.
 265         &Header::closebigbox();
 266         &Header::closepage();
 267
 268         # Finished here for the moment.
 269         exit(0);
 270 }
 271
 272 $cgiparams{'GENERAL'} = '';
 273 $cgiparams{'SERVERS'} = '';
 274 $cgiparams{'NAMESERVER'} = '';
 275 $cgiparams{'TLS_HOSTNAME'} = '';
 276 $cgiparams{'REMARK'} ='';
 277
 278 $checked{'USE_ISP_NAMESERVERS'}{'off'} = '';
 279 $checked{'USE_ISP_NAMESERVERS'}{'on'} = '';
 280 $checked{'USE_ISP_NAMESERVERS'}{$settings{'USE_ISP_NAMESERVERS'}} = "checked='checked'";
 281
 282 $checked{'ENABLE_SAFE_SEARCH'}{'off'} = '';
 283 $checked{'ENABLE_SAFE_SEARCH'}{'on'} = '';
 284 $checked{'ENABLE_SAFE_SEARCH'}{$settings{'ENABLE_SAFE_SEARCH'}} = "checked='checked'";
 285
 286 $selected{'PROTO'}{'UDP'} = '';
 287 $selected{'PROTO'}{'TLS'} = '';
 288 $selected{'PROTO'}{'TCP'} = '';
 289 $selected{'PROTO'}{$settings{'PROTO'}} = "selected='selected'";
 290
 291 $selected{'QNAME_MIN'}{'standard'} = '';
 292 $selected{'QNAME_MIN'}{'strict'} = '';
 293 $selected{'QNAME_MIN'}{$settings{'QNAME_MIN'}} = "selected='selected'";
 294
 295 # Display nameserver and configuration sections.
 296 &show_nameservers();
 297 &show_general_dns_configuration();
 298
 299 &Header::closebigbox();
 300 &Header::closepage();
 301
 302 ###
 303 # General DNS-Servers sektion.
 304 #
 305 sub show_general_dns_configuration () {
 306         &Header::openbox('100%', 'center', "$Lang::tr{'dns configuration'}");
 307
 308         print <<END;
 309         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 310                 <table width="100%">
 311                         <tr>
 312                                 <td width="33%">
 313                                         $Lang::tr{'dns use isp assigned nameservers'}
 314                                 </td>
 315
 316                                 <td>
 317                                         <input type="checkbox" name="USE_ISP_NAMESERVERS" $checked{'USE_ISP_NAMESERVERS'}{'on'}>
 318                                 </td>
 319                         </tr>
 320
 321                         <tr>
 322                                 <td colspan="2">
 323                                         <br>
 324                                 </td>
 325                         </tr>
 326
 327                         <tr>
 328                                 <td width="33%">
 329                                         $Lang::tr{'dns use protocol for dns queries'}
 330                                 </td>
 331
 332                                 <td>
 333                                         <select name="PROTO">
 334                                                 <option value="UDP" $selected{'PROTO'}{'UDP'}>UDP</option>
 335                                                 <option value="TLS" $selected{'PROTO'}{'TLS'}>TLS</option>
 336                                                 <option value="TCP" $selected{'PROTO'}{'TCP'}>TCP</option>
 337                                         </select>
 338                                 </td>
 339                         </tr>
 340
 341                         <tr>
 342                                 <td colspan="2">
 343                                         <br>
 344                                 </td>
 345                         </tr>
 346
 347                         <tr>
 348                                 <td width="33%">
 349                                         $Lang::tr{'dns enable safe-search'}
 350                                 </td>
 351
 352                                 <td>
 353                                         <input type="checkbox" name="ENABLE_SAFE_SEARCH" $checked{'ENABLE_SAFE_SEARCH'}{'on'}>
 354                                 </td>
 355                         </tr>
 356
 357                         <tr>
 358                                 <td colspan="2">
 359                                         <br>
 360                                 </td>
 361                         </tr>
 362
 363                         <tr>
 364                                 <td width="33%">
 365                                         $Lang::tr{'dns mode for qname minimisation'}
 366                                 </td>
 367
 368                                 <td>
 369                                         <select name="QNAME_MIN">
 370                                                 <option value="standard" $selected{'QNAME_MIN'}{'standard'}>$Lang::tr{'standard'}</option>
 371                                                 <option value="strict" $selected{'QNAME_MIN'}{'strict'}>$Lang::tr{'strict'}</option>
 372                                         </select>
 373                                 </td>
 374                         </tr>
 375
 376                         <tr>
 377                                 <td colspan="2" align="right">
 378                                         <input type="submit" name="GENERAL" value="$Lang::tr{'save'}">
 379                                 </td>
 380                         </tr>
 381                 </table>
 382         </form>
 383 END
 384
 385         &Header::closebox();
 386 }
 387
 388 ###
 389 # Section to display the configured and used DNS servers.
 390 #
 391 sub show_nameservers () {
 392         &Header::openbox('100%', 'center', "DNS-Servers");
 393
 394 print <<END;
 395                 <table class="tbl" width='100%'>
 396                         <tr>
 397                                 <td align="center">
 398                                         <strong>$Lang::tr{'nameserver'}</strong>
 399                                 </td>
 400
 401                                 <td align="center">
 402                                         <strong>$Lang::tr{'country'}</strong>
 403                                 </td>
 404
 405                                 <td align="center">
 406                                         <strong>$Lang::tr{'rdns'}</strong>
 407                                 </td>
 408
 409                                 <td align="center">
 410                                         <strong>$Lang::tr{'remark'}</strong>
 411                                 </td>
 412
 413                                 <td align="center">
 414                                         <strong>$Lang::tr{'status'}</strong>
 415                                 </td>
 416
 417                                 <td align="center" colspan="3">
 418                                         <strong>$Lang::tr{'action'}</strong>
 419                                 </td>
 420                         </tr>
 421 END
 422
 423                 # Check the usage of ISP assigned nameservers is enabled.
 424                 if ($settings{'USE_ISP_NAMESERVERS'} eq "on") {
 425                         my $id="1";
 426
 427                         # Loop through the array which stores the files.
 428                         foreach my $file (@ISP_nameserver_files) {
 429                                 # Grab the address of the nameserver.
 430                                 my $address = &grab_address_from_file($file);
 431
 432                                 # Check if we got an address.
 433                                 if ($address) {
 434                                         # Add the address to the hash of nameservers.
 435                                         $dns_servers{$id} = [ "$address", "none", "enabled", "$Lang::tr{'dns isp assigned nameserver'}" ];
 436
 437                                         # Increase id by one.
 438                                         $id++;
 439                                 }
 440                         }
 441                 }
 442
 443                 # Check some DNS servers have been configured. In this case
 444                 # the hash contains at least one key.
 445                 my $server_amount;
 446                 if (keys %dns_servers) {
 447                         # Sort the keys by their ID and store them in an array.
 448                         my @keys = sort { $a <=> $b } keys %dns_servers;
 449
 450                         # Loop through all entries of the array/hash.
 451                         foreach my $id (@keys) {
 452                                 # Inrease server_amount.
 453                                 $server_amount++;
 454
 455                                 # Assign data array positions to some nice variable names.
 456                                 my $nameserver = $dns_servers{$id}[0];
 457                                 my $tls_hostname = $dns_servers{$id}[1];
 458                                 my $enabled = $dns_servers{$id}[2];
 459                                 my $remark = $dns_servers{$id}[3];
 460
 461                                 my $col = '';
 462                                 my $toggle = '';
 463                                 my $gif = '';
 464                                 my $gdesc = '';
 465                                 my $notice = "";
 466
 467                                 # Colorize columns.
 468                                 if ($server_amount % 2) {
 469                                         $col="bgcolor='$color{'color22'}'"; }
 470                                 else {
 471                                         $col="bgcolor='$color{'color20'}'";
 472                                 }
 473
 474                                 if ($enabled eq 'enabled') {
 475                                         $gif='on.gif'; $toggle='off'; $gdesc=$Lang::tr{'click to disable'};
 476                                 } else {
 477                                         $gif='off.gif'; $toggle='on'; $gdesc=$Lang::tr{'click to enable'};
 478                                 }
 479
 480                                 my $status;
 481                                 my $status_short;
 482                                 my $status_message;
 483                                 my $status_colour;
 484
 485                                 # Only grab the status if the nameserver is enabled.
 486                                 if ($enabled eq "enabled") {
 487                                         $status = &check_nameserver("$nameserver", "ping.ipfire.org", "$settings{'PROTO'}", "$tls_hostname");
 488                                 }
 489
 490                                 if (!$status) {
 491                                         $status_short = "$Lang::tr{'disabled'}";
 492
 493                                 # DNSSEC Not supported
 494                                 } elsif ($status eq 0) {
 495                                         $status_short = "$Lang::tr{'broken'}";
 496                                         $status_message = $Lang::tr{'dnssec not supported'};
 497                                         $status_colour = ${Header::colourred};
 498
 499                                 # DNSSEC Aware
 500                                 } elsif ($status eq 1) {
 501                                         $status_short = "$Lang::tr{'not validating'}";
 502                                         $status_message = $Lang::tr{'dnssec aware'};
 503                                         $status_colour = ${Header::colourblack};
 504
 505                                 # DNSSEC Validating
 506                                 } elsif ($status eq 2) {
 507                                         $status_short = "$Lang::tr{'ok'}";
 508                                         $status_message = $Lang::tr{'dnssec validating'};
 509                                         $status_colour = ${Header::colourgreen};
 510
 511                                 # Error
 512                                 } else {
 513                                         $status_short = "$Lang::tr{'error'}";
 514                                         $status_message = $status;
 515                                         $status_colour = ${Header::colourred};
 516                                 }
 517
 518                                 # collect more information about name server (rDNS, GeoIP country code)
 519                                 my $ccode = &GeoIP::lookup($nameserver);
 520                                 my $flag_icon = &GeoIP::get_flag_icon($ccode);
 521
 522                                 my $iaddr = inet_aton($nameserver);
 523                                 my $rdns = gethostbyaddr($iaddr, AF_INET);
 524
 525                                 if (!$rdns) { $rdns = $Lang::tr{'lookup failed'}; }
 526
 527 print <<END;
 528                         <tr>
 529                                 <td align="center" $col>
 530                                         $nameserver
 531                                 </td>
 532
 533                                 <td align="center" $col>
 534                                         <a href='country.cgi#$ccode'><img src="$flag_icon" border="0" alt="$ccode" title="$ccode" /></a>
 535                                 </td>
 536
 537                                 <td align="center" $col>
 538                                         $rdns
 539                                 </td>
 540
 541                                 <td align="center" $col>
 542                                         $remark
 543                                 </td>
 544
 545                                 <td align="center" $col>
 546                                         <strong><font color="$status_colour"><abbr title="$status_message">$status_short</abbr></font></strong>
 547                                 </td>
 548 END
 549 ;
 550                                 # Check if the id is greater than "2".
 551                                 #
 552                                 # Nameservers with an ID's of one or two are ISP assigned,
 553                                 # and we cannot perform any actions on them, so hide the tools for
 554                                 # them.
 555                                 if ($id gt "2") {
 556
 557 print <<END;
 558                                         <td align='center' width='5%' $col>
 559                                                 <form method='post' name='frma$id' action='$ENV{'SCRIPT_NAME'}'>
 560                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' title='$gdesc' alt='$gdesc' />
 561                                                         <input type='hidden' name='ID' value='$id' />
 562                                                         <input type='hidden' name='ENABLE' value='$toggle' />
 563                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'toggle enable disable'}' />
 564                                                 </form>
 565                                         </td>
 566
 567                                         <td align='center' width='5%' $col>
 568                                                 <form method='post' name='frmb$id' action='$ENV{'SCRIPT_NAME'}'>
 569                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' title='$Lang::tr{'edit'}' alt='$Lang::tr{'edit'}' />
 570                                                         <input type='hidden' name='ID' value='$id' />
 571                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'edit'}' />
 572                                                 </form>
 573                                         </td>
 574
 575                                         <td align='center' width='5%' $col>
 576                                                 <form method='post' name='frmc$id' action='$ENV{'SCRIPT_NAME'}'>
 577                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}' />
 578                                                         <input type='hidden' name='ID' value='$id' />
 579                                                         <input type='hidden' name='SERVERS' value='$Lang::tr{'remove'}' />
 580                                                 </form>
 581                                         </td>
 582 END
 583 ;
 584                         } else {
 585                                         print "<td colspan='3' $col>&nbsp;</td>\n";
 586                         }
 587
 588
 589                         print"</tr>\n";
 590
 591                 }
 592
 593                 print"</table>\n";
 594
 595                 print"<table width='100%'>\n";
 596
 597                 # Check if the usage of the ISP nameservers is enabled and there are more than 2 servers.
 598                 if (($settings{'USE_ISP_NAMESERVERS'} eq "on") && ($server_amount gt "2")) {
 599 print <<END;
 600                         <tr>
 601                                 <td class='boldbase'>&nbsp; <b>$Lang::tr{'legend'}:</b></td>
 602                                 <td>&nbsp; <img src='/images/on.gif' alt='$Lang::tr{'click to disable'}' /></td>
 603                                 <td class='base'>$Lang::tr{'click to disable'}</td>
 604                                 <td>&nbsp; &nbsp; <img src='/images/off.gif' alt='$Lang::tr{'click to enable'}' /></td>
 605                                 <td class='base'>$Lang::tr{'click to enable'}</td>
 606                                 <td>&nbsp; &nbsp; <img src='/images/edit.gif' alt='$Lang::tr{'edit'}' /></td>
 607                                 <td class='base'>$Lang::tr{'edit'}</td>
 608                                 <td>&nbsp; &nbsp; <img src='/images/delete.gif' alt='$Lang::tr{'remove'}' /></td>
 609                                 <td class='base'>$Lang::tr{'remove'}</td>
 610                         </tr>
 611 END
 612 ;
 613                 }
 614 print <<END;
 615                         <tr>
 616                                 <form method="post" action="$ENV{'SCRIPT_NAME'}">
 617                                         <td colspan="9" align="right"><input type="submit" name="SERVERS" value="$Lang::tr{'add'}"></td>
 618                                 </form>
 619                         </tr>
 620                 </table>
 621 END
 622 ;
 623
 624                 } else {
 625 print <<END;
 626                 <table width="100%">
 627                         <tr>
 628                                 <td colspan="6" align="center">
 629                                         <br>$Lang::tr{'guardian no entries'}<br>
 630                                 </td>
 631                         </tr>
 632
 633                         <tr>
 634                                 <form method="post" action="$ENV{'SCRIPT_NAME'}">
 635                                         <td colspan="6" align="right"><input type="submit" name="SERVERS" value="$Lang::tr{'add'}"></td>
 636                                 </form>
 637                         </tr>
 638                 </table>
 639
 640 END
 641 ;
 642                 }
 643
 644         &Header::closebox();
 645 }
 646
 647 ###
 648 # Section to display the add or edit subpage.
 649 #
 650 sub show_add_edit_nameserver() {
 651         print "<form method='post' action='$ENV{'SCRIPT_NAME'}'>\n";
 652
 653         my $buttontext = $Lang::tr{'save'};
 654         my $dnssec_checked;
 655         my $dot_checked;
 656         if ($cgiparams{'SERVERS'} eq $Lang::tr{'edit'}) {
 657                 &Header::openbox('100%', 'left', $Lang::tr{'dnsforward edit an entry'});
 658
 659                 # Update button text for upate the existing entry.
 660                 $buttontext = $Lang::tr{'update'};
 661
 662                 # Add hidden input for sending ID.
 663                 print"<input type='hidden' name='ID' value='$cgiparams{'ID'}'>\n";
 664
 665                 # Check if an ID has been given.
 666                 if ($cgiparams{'ID'}) {
 667                         # Assign cgiparams values.
 668                         $cgiparams{'NAMESERVER'} = $dns_servers{$cgiparams{'ID'}}[0];
 669                         $cgiparams{'TLS_HOSTNAME'} = $dns_servers{$cgiparams{'ID'}}[1];
 670                         $cgiparams{'REMARK'} = $dns_servers{$cgiparams{'ID'}}[3];
 671                 }
 672         } else {
 673                 &Header::openbox('100%', 'left', $Lang::tr{'dnsforward add a new entry'});
 674         }
 675
 676         # Add hidden input to store the mode.
 677         print "<input type='hidden' name='MODE' value='$cgiparams{'SERVERS'}'>\n";
 678
 679 print <<END
 680         <table width='100%'>
 681                 <tr>
 682                         <td width='20%' class='base'>$Lang::tr{'ip address'}:&nbsp;<img src='/blob.gif' alt='*' /></td>
 683                         <td><input type='text' name='NAMESERVER' value='$cgiparams{"NAMESERVER"}' size='24' /></td>
 684                 </tr>
 685 END
 686 ;
 687         # If the protocol is TLS, display the TLS hostname input.
 688         if ($settings{'PROTO'} eq "TLS") {
 689 print <<END
 690                 <tr>
 691                         <td width='20%' class='base'>$Lang::tr{'dns tls hostname'}:&nbsp;<img src='/blob.gif' alt='*'></td>
 692                         <td><input type='text' name='TLS_HOSTNAME' value='$cgiparams{'TLS_HOSTNAME'}' size='24'></td>
 693                 </tr>
 694 END
 695 ;
 696         }
 697
 698 print <<END
 699
 700                 <tr>
 701                         <td width ='20%' class='base'>$Lang::tr{'remark'}:</td>
 702                         <td><input type='text' name='REMARK' value='$cgiparams{'REMARK'}' size='40' maxlength='50' /></td>
 703                 </tr>
 704         </table>
 705
 706         <br>
 707         <hr>
 708
 709         <table width='100%'>
 710                 <tr>
 711                         <td class='base' width='55%'><img src='/blob.gif' alt ='*' align='top' />&nbsp;$Lang::tr{'required field'}</td>
 712                         <td width='40%' align='right'>
 713                                 <input type="submit" name="SERVERS" value="$buttontext">
 714                                 <input type="submit" name="SERVERS" value="$Lang::tr{'back'}">
 715                         </td>
 716                 </tr>
 717         </table>
 718 END
 719 ;
 720
 721         &Header::closebox();
 722         print "</form>\n";
 723
 724         &Header::closebox();
 725 }
 726
 727 # Tiny function to grab an IP-address of a given file.
 728 sub grab_address_from_file($) {
 729         my ($file) = @_;
 730
 731         my $address;
 732
 733         # Check if the given file exists.
 734         if(-f $file) {
 735                 # Open the file for reading.
 736                 open(FILE, $file) or die "Could not read from $file. $!\n";
 737
 738                 # Read the address from the file.
 739                 $address = <FILE>;
 740
 741                 # Close filehandle.
 742                 close(FILE);
 743
 744                 # Remove newlines.
 745                 chomp($address);
 746
 747                 # Check if the obtained address is valid.
 748                 if (&General::validip($address)) {
 749                         # Return the address.
 750                         return $address;
 751                 }
 752         }
 753
 754         # Return nothing.
 755         return;
 756 }
 757
 758 # Function to check a given nameserver against propper work.
 759 sub check_nameserver($$$$) {
 760         my ($nameserver, $record, $proto, $tls_hostname) = @_;
 761
 762         # Timout for the query in seconds.
 763         my $timeout;
 764         my $retry = "+retry=0";
 765
 766         # Default values.
 767         my @command = ("kdig", "$timeout", "$retry", "+dnssec",
 768                 "+bufsize=1232");
 769
 770         # Handle different protols.
 771         if ($proto eq "TCP") {
 772                 # Add TCP switch to the command.
 773                 push(@command, "+tcp");
 774
 775         } elsif($proto eq "TLS") {
 776                 # Add TLS switch to the command and provide the
 777                 # path to our file which contains the ca certs.
 778                 push(@command, "+tls-ca=$ca_certs_file");
 779
 780                 # Check if a TLS hostname has been provided.
 781                 if ($tls_hostname) {
 782                         # Add TLS hostname to the command.
 783                         push(@command, "+tls-hostname=$tls_hostname");
 784                 } else {
 785                         return "$Lang::tr{'dns no tls hostname given'}";
 786                 }
 787         }
 788
 789         # Add record to the command array.
 790         push(@command, "$record");
 791
 792         # Add nameserver to the command array.
 793         push(@command, "\@$nameserver");
 794
 795         # Connect to STDOUT and STDERR.
 796         push(@command, "2>&1");
 797
 798         my @output = qx(@command);
 799         my $output = join("", @output);
 800
 801         my $status = 0;
 802         if ($output =~ m/WARNING: (.*)/) {
 803                 return $1;
 804
 805         }
 806
 807         if ($output =~ m/status: (\w+)/) {
 808                 $status = ($1 eq "NOERROR");
 809
 810                 if (!$status) {
 811                         return -1;
 812                 }
 813         }
 814
 815         my @flags = ();
 816         if ($output =~ m/Flags: (.*);/) {
 817                 @flags = split(/ /, $1);
 818         }
 819
 820         my $aware = ($output =~ m/RRSIG/);
 821         my $validating = ("ad;" ~~ @flags);
 822
 823         return $aware + $validating;
 824 }