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ryanmrryanmr
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‎.gitignore

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# app specific #
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################
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datastore/dd_*
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# Compiled source #
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###################
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*.com
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*.class
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*.dll
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*.exe
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*.o
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*.so
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# Packages #
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############
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# it's better to unpack these files and commit the raw source
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# git has its own built in compression methods
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*.7z
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*.dmg
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*.gz
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*.iso
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*.jar
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*.rar
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*.tar
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*.zip
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# Logs and databases #
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######################
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*.log
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*.sql
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*.sqlite
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# OS generated files #
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######################
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.DS_Store
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.DS_Store?
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._*
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.Spotlight-V100
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.Trashes
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ehthumbs.db
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Thumbs.db

‎.htaccess

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RewriteEngine On
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RewriteBase /dev/dns/
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RewriteCond %{REQUEST_FILENAME} !-d
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RewriteCond %{REQUEST_FILENAME} !-f
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RewriteRule ^ping/([^/]*)/([^/]*)$ dns.php?token=$1&hostname=$2 [QSA,L]
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RewriteRule ^([^/]*)$ index.php?hostname=$1&type=$2 [QSA,L]

‎datastore/.htaccess

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deny from all

‎datastore/sample.dd_config.json

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{
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"api_key": "your linode api key",
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"token": "some random string of characters",
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"hosts": {
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"your computer's hostname": {"domain_id": "your linode domain id", "resource_id": "your linode resource id"}
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}
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}

‎datastore/sample.dd_data.json

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{"hosts":
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{}
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}

‎dns.php

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<?php
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require("loader.php");
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$receptor = new DynamicDNS_Receptor();
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$receptor->refresh();

‎index.php

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<?php
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require("loader.php");
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$viewer = new DynamicDNS_Viewer();
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$viewer->render();

‎library/DataStore.php

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<?php
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class DynamicDNS_DataStore {
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public $config;
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public $data;
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public function __construct() {
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try {
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$this->load();
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} catch (Exception $e) {
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Helper::feedback(array('code' => 500, 'could not handle config/data files'));
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}
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}
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public function load() {
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$this->config = json_decode(file_get_contents(DD_CONFIG));
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$this->data = json_decode(file_get_contents(DD_DATA));
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}
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public function save() {
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file_put_contents(DD_DATA, json_encode($this->data));
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}
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}

‎library/Helper.php

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<?php
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class Helper {
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public static function feedback($obj = array()) {
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$obj = array_merge(array(
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"status" => "normal",
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"code" => 200,
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"time" => time()
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), $obj);
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http_response_code($obj['code']);
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echo json_encode($obj);
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}
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}

‎library/Receptor.php

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<?php
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class DynamicDNS_Receptor {
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private $datastore;
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public function __construct() {
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$this->datastore = new DynamicDNS_DataStore();
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}
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private function is_request_valid() {
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$hostname = isset($_GET['hostname']) && !empty($_GET['hostname']);
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$token = isset($_GET['token']) && !empty($_GET['token']);
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return $hostname && $token;
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}
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private function verify_hostname() {
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$hostname = $_GET['hostname'];
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$config = isset( $this->datastore->config->hosts->{$hostname} );
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if ( $config ) {
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if ( isset($this->datastore->data->hosts->{$hostname}) == false ) {
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$obj = new stdClass();
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$obj->{'last_update'} = 0;
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$obj->{'updates'} = 0;
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$obj->{'ip'} = '';
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$this->datastore->data->hosts->{$hostname} = $obj;
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}
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return true;
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}
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return false;
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}
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private function verify_token() {
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$token = $_GET['token'];
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if ( $token == $this->datastore->config->token ) {
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return true;
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}
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return false;
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}
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private function verify_change($hostname) {
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$client_ip = $_SERVER['REMOTE_ADDR'];
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// has not changed
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if ( $this->datastore->data->hosts->{$hostname}->{'ip'} == $client_ip ) {
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return false;
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}
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// has changed
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return true;
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}
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public function refresh() {
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if ( !$this->is_request_valid() ) {
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Helper::feedback(array("code" => 400, "status" => "invalid request"));
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return false;
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}
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if ( !$this->verify_token() ) {
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Helper::feedback(array("code" => 401, "status" => "invalid token"));
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return false;
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}
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if ( !$this->verify_hostname() ) {
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Helper::feedback(array("code" => 401, "status" => "invalid hostname"));
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return false;
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}
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$hostname = $_GET['hostname'];
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$config = $this->datastore->config->hosts->{$hostname};
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$data = $this->datastore->data->hosts->{$hostname};
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if ( $this->verify_change($hostname) == false ) {
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Helper::feedback(array("code" => 202, "status" => "host not changed"));
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return false;
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}
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$result = $this->update($hostname);
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if ( $result ) {
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Helper::feedback(array("code" => 201, "status" => "dynamic dns successful"));
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} else {
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Helper::feedback(array("code" => 500, "status" => "dynamic dns failed"));
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}
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}
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private function update($hostname) {
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$ip = $_SERVER['REMOTE_ADDR'];
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$url = sprintf("%sapi_key=%s&api_action=domain.resource.update&DomainID=%s&ResourceID=%s&Target=%s", LINODE_API, $this->datastore->config->api_key, $this->datastore->config->hosts->{$hostname}->{'domain_id'}, $this->datastore->config->hosts->{$hostname}->{'resource_id'}, $ip);
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$response = file_get_contents($url);
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$response_json = json_decode($response);
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if ( count($response_json->{'ERRORARRAY'}) == 0 ) {
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$this->datastore->data->hosts->{$hostname}->{'ip'} = $ip;
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$this->datastore->data->hosts->{$hostname}->{'updates'} = $this->datastore->data->hosts->{$hostname}->{'updates'} + 1;
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$this->datastore->data->hosts->{$hostname}->{'last_update'} = time();
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$this->datastore->save();
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return true;
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}
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return false;
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}
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}

‎library/Viewer.php

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<?php
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class DynamicDNS_Viewer {
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private $datastore;
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public function __construct() {
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$this->datastore = new DynamicDNS_DataStore();
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}
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private function is_request_valid() {
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if ( isset($_GET['hostname']) == false ) {
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return false;
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}
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$hostname = $_GET['hostname'];
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$config = isset( $this->datastore->config->hosts->{$hostname} );
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$data = isset( $this->datastore->data->hosts->{$hostname} );
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if ( $config && $data ) {
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return true;
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}
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return false;
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}
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public function render() {
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if ( !$this->is_request_valid() ) {
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include(DD_VIEWS . 'invalid-hostname-view.php');
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return false;
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}
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$type = "html";
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if ( isset($_GET['type']) && !empty($_GET['type']) ) {
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$type = $_GET['type'];
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}
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$hostname = $_GET['hostname'];
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$ip = $this->datastore->data->hosts->{$hostname}->{'ip'};
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switch ($type) {
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case 'plain':
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include(DD_VIEWS . 'plain-view.php');
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break;
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case 'json':
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include(DD_VIEWS . 'json-view.php');
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break;
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default:
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include(DD_VIEWS . 'html-view.php');
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break;
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}
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}
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}

‎loader.php

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<?php
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define('DD_CONFIG', 'datastore/dd_config.json');
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define('DD_DATA', 'datastore/dd_data.json');
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define('DD_VIEWS', 'views/');
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define('DD_LIBRARY', 'library/');
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define('LINODE_API', 'https://api.linode.com/api/?');
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require_once(DD_LIBRARY . 'Helper.php');
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require_once(DD_LIBRARY . 'DataStore.php');
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require_once(DD_LIBRARY . 'Receptor.php');
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require_once(DD_LIBRARY . 'Viewer.php');

‎view.php

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<?php
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require("loader.php");
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$viewer = new DynamicDNS_Viewer();
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$viewer->render();

‎views/html-view.php

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<?php if (!defined('DD_VIEWS')) {exit(-1);} ?>
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<!doctype html>
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<html>
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<head>
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<title><?php echo $hostname; ?></title>
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<style type="text/css">
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body {
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background-color: #ddd;
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color: #222;
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font-size: 1em;
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font-family: Helvetica, Arial, sans-serif;
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}
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.container h1 {
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font-size: 4em;
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text-align: center;
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}
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a, a:link {
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color: #222;
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text-decoration: none;
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}
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a:hover {
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color: #000;
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text-decoration: underline;
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}
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</style>
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</head>
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<body>
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<div class="container">
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<h1><a href="http://<?php echo $ip; ?>/"><?php echo $ip; ?></a></h1>
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</div>
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</body>
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</html>

‎views/invalid-hostname-view.php

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<?php if (!defined('DD_VIEWS')) {exit(-1);} ?>
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<!doctype html>
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<html>
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<head>
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<title>invalid hostname</title>
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<style type="text/css">
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body {
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background-color: #ddd;
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color: #222;
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font-size: 1em;
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font-family: Helvetica, Arial, sans-serif;
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}
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.container h2 {
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font-size: 4em;
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text-align: center;
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}
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</style>
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</head>
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<body>
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<div class="container">
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<h2>invalid hostname</h2>
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</div>
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</body>
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</html>

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