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<?php
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/*
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	diag_dns.php
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	Copyright (C) 2009 Jim Pingle (jpingle@gmail.com)
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	Copyright (C) 2013-2015 Electric Sheep Fencing, LP
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	All rights reserved.
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	Redistribution and use in source and binary forms, with or without
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	modification, are permitted provided that the following conditions are met:
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	1. Redistributions of source code must retain the above copyright notice,
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	this list of conditions and the following disclaimer.
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	2. Redistributions in binary form must reproduce the above copyright
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	notice, this list of conditions and the following disclaimer in the
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	documentation and/or other materials provided with the distribution.
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	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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	AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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	AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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	OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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	POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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	pfSense_MODULE: dns
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*/
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$pgtitle = array(gettext("Diagnostics"),gettext("DNS lookup"));
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require("guiconfig.inc");
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$host = trim($_REQUEST['host'], " \t\n\r\0\x0B[];\"'");
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$host_esc = escapeshellarg($host);
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/* If this section of config.xml has not been populated yet we need to set it up
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*/
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if (!is_array($config['aliases']['alias'])) {
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	$config['aliases']['alias'] = array();
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}
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$a_aliases = &$config['aliases']['alias'];
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$aliasname = str_replace(array(".","-"), "_", $host);
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$alias_exists = false;
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$counter=0;
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foreach($a_aliases as $a) {
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	if($a['name'] == $aliasname) {
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		$alias_exists = true;
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		$id=$counter;
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	}
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	$counter++;
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}
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if(isset($_POST['create_alias']) && (is_hostname($host) || is_ipaddr($host))) {
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	if($_POST['override'])
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		$override = true;
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	$resolved = gethostbyname($host);
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	$type = "hostname";
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	if($resolved) {
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		$resolved = array();
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		exec("/usr/bin/drill {$host_esc} A | /usr/bin/grep {$host_esc} | /usr/bin/grep -v ';' | /usr/bin/awk '{ print $5 }'", $resolved);
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		$isfirst = true;
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		foreach($resolved as $re) {
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			if($re != "") {
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				if(!$isfirst)
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					$addresses .= " ";
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				$addresses .= rtrim($re) . "/32";
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				$isfirst = false;
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			}
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		}
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		$newalias = array();
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		if($override)
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			$alias_exists = false;
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		if($alias_exists == false) {
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			$newalias['name'] = $aliasname;
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			$newalias['type'] = "network";
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			$newalias['address'] = $addresses;
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			$newalias['descr'] = "Created from Diagnostics-> DNS Lookup";
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			if($override)
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				$a_aliases[$id] = $newalias;
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			else
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				$a_aliases[] = $newalias;
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			write_config();
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			$createdalias = true;
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		}
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	}
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}
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if ($_POST) {
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	unset($input_errors);
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	$reqdfields = explode(" ", "host");
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	$reqdfieldsn = explode(",", "Host");
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	do_input_validation($_POST, $reqdfields, $reqdfieldsn, $input_errors);
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	if (!is_hostname($host) && !is_ipaddr($host)) {
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		$input_errors[] = gettext("Host must be a valid hostname or IP address.");
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	} else {
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		// Test resolution speed of each DNS server.
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		$dns_speeds = array();
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		$dns_servers = array();
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		exec("/usr/bin/grep nameserver /etc/resolv.conf | /usr/bin/cut -f2 -d' '", $dns_servers);
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		foreach ($dns_servers as $dns_server) {
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			$query_time = exec("/usr/bin/drill {$host_esc} " . escapeshellarg("@" . trim($dns_server)) . " | /usr/bin/grep Query | /usr/bin/cut -d':' -f2");
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			if($query_time == "")
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				$query_time = gettext("No response");
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			$new_qt = array();
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			$new_qt['dns_server'] = $dns_server;
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			$new_qt['query_time'] = $query_time;
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			$dns_speeds[] = $new_qt;
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			unset($new_qt);
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		}
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	}
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	$type = "unknown";
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	$resolved = "";
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	$ipaddr = "";
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	$hostname = "";
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	if (!$input_errors) {
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		if (is_ipaddr($host)) {
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			$type = "ip";
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			$resolved = gethostbyaddr($host);
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			$ipaddr = $host;
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			if ($host != $resolved)
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				$hostname = $resolved;
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		} elseif (is_hostname($host)) {
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			$type = "hostname";
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			$resolved = gethostbyname($host);
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			if($resolved) {
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				$resolved = array();
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				exec("/usr/bin/drill {$host_esc} A | /usr/bin/grep {$host_esc} | /usr/bin/grep -v ';' | /usr/bin/awk '{ print $5 }'", $resolved);
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			}
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			$hostname = $host;
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			if ($host != $resolved)
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				$ipaddr = $resolved[0];
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		}
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		if ($host == $resolved) {
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			$resolved = gettext("No record found");
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		}
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	}
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}
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if( ($_POST['host']) && ($_POST['dialog_output']) ) {
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	display_host_results ($host,$resolved,$dns_speeds);
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	exit;
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}
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function display_host_results ($address,$hostname,$dns_speeds) {
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	$map_lengths = function($element) { return strlen($element[0]); };
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	echo gettext("IP Address") . ": {$address} \n";
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	echo gettext("Host Name") . ": {$hostname} \n";
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	echo "\n";
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	$text_table = array();
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	$text_table[] = array(gettext("Server"), gettext("Query Time"));
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	if (is_array($dns_speeds)) {
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		foreach ($dns_speeds as $qt) {
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			$text_table[] = array(trim($qt['dns_server']), trim($qt['query_time']));
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		}
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	}
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	$col0_padlength = max(array_map($map_lengths, $text_table)) + 4;
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	foreach ($text_table as $text_row) {
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		echo str_pad($text_row[0], $col0_padlength) . $text_row[1] . "\n";
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	}
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}
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include("head.inc");
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/* Display any error messages resulting from user input */
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if ($input_errors)
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	print_input_errors($input_errors);
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else if (!$resolved && $type)
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	print('<div class="alert alert-warning" role="alert">' . gettext("Host") .' "'. $host .'" '. gettext("could not be resolved") . '</div>');
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if ($createdalias)
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	print('<div class="alert alert-success" role="alert">'.gettext("Alias was created/updated successfully").'</div>');
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require('classes/Form.class.php');
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$form = new Form(new Form_Button(
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	'lookup',
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	'Lookup'
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));
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$section = new Form_Section('DNS Lookup');
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$section->addInput(new Form_Input(
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	'host',
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	'Hostname',
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	'text',
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	$host,
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	['placeholder' => 'Hostname to look up.']
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));
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if (!empty($resolved)) {
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	$form->addGlobal(new Form_Button(
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		'create_alias',
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		'Add alias'
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	))->removeClass('btn-primary')->addClass('btn-success');
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}
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$form->add($section);
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print $form;
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if (!$input_errors && $type) {
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	if ($resolved):
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?>
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<div class="panel panel-default">
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	<div class="panel-heading">Results</div>
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	<div class="panel-body">
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		<ul class="list-group">
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<?
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		foreach ((array)$resolved as $hostitem) {
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?>
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			<li class="list-group-item"><?=$hostitem?></li>
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<?
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			if ($hostitem != "") {
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				$found++;
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			}
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		}
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?>
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		</ul>
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	</div>
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</div>
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<? endif?>
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<!-- Second table displays the server resolution times -->
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<div class="panel panel-default">
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	<div class="panel-heading">Timings</div>
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	<div class="panel-body">
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		<table class="table">
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		<thead>
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			<tr>
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				<th>Name server</th>
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				<th>Query time</th>
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			</tr>
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		</thead>
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		<tbody>
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<? foreach ((array)$dns_speeds as $qt):?>
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		<tr>
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			<td><?=$qt['dns_server']?></td><td><?=$qt['query_time']?></td>
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		</tr>
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<? endforeach?>
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		</tbody>
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		</table>
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	</div>
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</div>
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<!-- Third table displays "More information" -->
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<div class="panel panel-default">
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	<div class="panel-heading">More information</div>
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	<div class="panel-body">
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		<ul class="list-group">
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			<li class="list-group-item"><a href="/diag_ping.php?host=<?=htmlspecialchars($host)?>&amp;interface=wan&amp;count=3"><?=gettext("Ping")?></a></li>
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			<li class="list-group-item"><a href="/diag_traceroute.php?host=<?=htmlspecialchars($host)?>&amp;ttl=18"><?=gettext("Traceroute")?></a></li>
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		</ul>
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		<p><?=gettext("NOTE: The following links are to external services, so their reliability cannot be guaranteed.");?></p>
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		<ul class="list-group">
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			<li class="list-group-item"><a target="_blank" href="http://private.dnsstuff.com/tools/whois.ch?ip=<?php echo $ipaddr; ?>"><?=gettext("IP WHOIS @ DNS Stuff");?></a></li>
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			<li class="list-group-item"><a target="_blank" href="http://private.dnsstuff.com/tools/ipall.ch?ip=<?php echo $ipaddr; ?>"><?=gettext("IP Info @ DNS Stuff");?></a></li>
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		</ul>
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	</div>
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</div>
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<?php
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}
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include("foot.inc");
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