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[hub.git] / application / hub / main / tools / class_HubTools.php
1 <?php
2 /**
3  * This class contains static helper functions for our hub
4  *
5  * @author              Roland Haeder <webmaster@ship-simu.org>
6  * @version             0.0.0
7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2012 Hub Developer Team
8  * @license             GNU GPL 3.0 or any newer version
9  * @link                http://www.ship-simu.org
10  *
11  * This program is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation, either version 3 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
23  */
24 class HubTools extends BaseHubSystem {
25         // Constants for exceptions
26         const EXCEPTION_SESSION_ID_IS_INVALID = 0x200;
27         const EXCEPTION_HOSTNAME_NOT_FOUND    = 0x201;
28
29         /**
30          * Cache for session ids
31          */
32         private $sessionIdCache = array();
33
34         /**
35          * Length for session id (should be 32+salt_length
36          */
37         private $sessionIdLength = 0;
38
39         /**
40          * Self instance
41          */
42         private static $selfInstance = NULL;
43
44         /**
45          * Protected constructor
46          *
47          * @return      void
48          */
49         protected function __construct () {
50                 // Call parent constructor
51                 parent::__construct(__CLASS__);
52
53                 // Init salt length
54                 $this->sessionIdLength = 32 + $this->getConfigInstance()->getConfigEntry('salt_length');
55         }
56
57         /**
58          * Singleton getter for self instance
59          *
60          * @retuen      $selfInstance   An instance of this class
61          */
62         public static final function getSelfInstance () {
63                 // Is the instance set
64                 if (is_null(self::$selfInstance)) {
65                         // Then set it
66                         self::$selfInstance = new HubTools();
67                 } // END - if
68
69                 // Return own instance
70                 return self::$selfInstance;
71         }
72
73         /**
74          * Getter for session id length
75          *
76          * @return      $sessionIdLength        Length of session ids
77          */
78         protected final function getSessionIdLength () {
79                 return $this->sessionIdLength;
80         }
81
82         /**
83          * Resolves a session id into an ip:port combination
84          *
85          * @param       $sessionId      A valid session id
86          * @param       $protocol       Name of the used protocol: TCP/UDP
87          * @return      $recipient      Recipient as ip:port combination
88          */
89         protected function resolveIpPortBySessionId ($sessionId, $protocol) {
90                 // Get a wrapper instance
91                 $wrapperInstance = DatabaseWrapperFactory::createWrapperByConfiguredName('node_list_db_wrapper_class');
92
93                 // And ask it for the session id
94                 $recipient = $wrapperInstance->resolveIpPortBySessionId($sessionId, $protocol);
95
96                 // Is the recipient invalid?
97                 if ($recipient == 'invalid:invalid') {
98                         // Get the instance, this might throw a NPE
99                         $nodeInstance = Registry::getRegistry()->getInstance('node');
100
101                         // Is the session id the same?
102                         if ($nodeInstance->getSessionId() == $sessionId) {
103                                 // Then get the ip:port from it, assume TCP by default
104                                 $recipient = self::determineOwnExternalIp() . ':' . $nodeInstance->getConfigInstance()->getConfigEntry('node_' . strtolower($protocol) . '_listen_port');
105                         } // END - if
106                 } // END - if
107
108                 // Return result
109                 return $recipient;
110         }
111
112         /**
113          * Resolves a ip:port combination into a session id
114          *
115          * @param       $ipPort         Ip:port combination
116          * @param       $protocol       Name of used protocol (TCP/UDP)
117          * @return      $sessionId      Valid session id
118          */
119         public static function resolveSessionIdByIpPort ($ipPort, $protocol) {
120                 // Get a wrapper instance
121                 $wrapperInstance = DatabaseWrapperFactory::createWrapperByConfiguredName('node_list_db_wrapper_class');
122
123                 // And ask it for the session id
124                 $sessionId = $wrapperInstance->resolveSessionIdByIpPort($ipPort, $protocol);
125
126                 // Return result
127                 return $sessionId;
128         }
129
130         /**
131          * Resolves given session id into an ip:port combination, if ip:port is set, it won't be translated
132          *
133          * @param       $sessionId      Session id or ip:port combination
134          * @param       $protocol       Name of the used protocol (TCP/UDP)
135          * @return      $recipient      Recipient as ip:port combination
136          * @throws      InvalidSessionIdException       If the provided session id is invalid (and no ip:port combination)
137          * @throws      NoValidHostnameException        If the provided hostname cannot be resolved into an IP address
138          */
139         public static function resolveSessionId ($sessionId, $protocol) {
140                 // Get an own instance
141                 $selfInstance = self::getSelfInstance();
142
143                 // Default is direct ip:port
144                 $recipient = $sessionId;
145
146                 // Does it match a direct ip:port? (hint: see www.regexlib.com for the regular expression)
147                 if (preg_match('/((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])):([0-9]{3,5})/', $sessionId)) {
148                         // Direct ip:port found
149                         $selfInstance->debugOutput('HUB-TOOLS: Direct ip:port ' . $sessionId . ' detected.');
150                 } elseif (isset($selfInstance->sessionIdCache[$sessionId])) {
151                         // Debug message
152                         $selfInstance->debugOutput('HUB-TOOLS: Using entry from sessionIdCache[] array.');
153
154                         // Found in cache!
155                         $recipient = $selfInstance->sessionIdCache[$sessionId];
156
157                         // Debug message
158                         $selfInstance->debugOutput('HUB-TOOLS: sessionIdCache[' . $sessionId . ']=' . $recipient);
159                 } elseif (preg_match('/([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}:([0-9]{3,5})/', $sessionId)) {
160                         // Hostname:port found
161                         $selfInstance->debugOutput('HUB-TOOLS: hostname:port ' . $sessionId . ' detected.');
162
163                         // Hostname:port found
164                         $hostnameArray = explode(':', $sessionId);
165
166                         // Try to resolve it and add port again
167                         // @TODO Please try to encapsulate this PHP call into an own class
168                         $recipient = gethostbyname($hostnameArray[0]) . ':' . $hostnameArray[1];
169
170                         // Is it valid?
171                         if ($recipient == $sessionId) {
172                                 // Resolving hostname->IP failed!
173                                 throw new NoValidHostnameException($hostnameArray, self::EXCEPTION_HOSTNAME_NOT_FOUND);
174                         } // END - if
175
176                         // Debug message
177                         $selfInstance->debugOutput('HUB-TOOLS: hostname:port ' . $sessionId . ' resolved to ' . $recipient);
178                 } elseif (preg_match('/([a-f0-9]{' . $selfInstance->getSessionIdLength() . '})/', $sessionId)) {
179                         // Debug message
180                         $selfInstance->debugOutput('HUB-TOOLS: Using internal session id resolver.');
181
182                         // Resolve session id into a ip:port combination
183                         $recipient = $selfInstance->resolveIpPortBySessionId($sessionId, $protocol);
184
185                         // Debug message
186                         $selfInstance->debugOutput('HUB-TOOLS: session id ' . $sessionId . ' resolved to ' . $recipient);
187                 } else {
188                         // Invalid session id
189                         throw new InvalidSessionIdException($sessionId, self::EXCEPTION_SESSION_ID_IS_INVALID);
190                 }
191
192                 // Return it
193                 return $recipient;
194         }
195
196         /**
197          * Determine IP or 'external_ip' if set
198          *
199          * @return      $ip             The determined external ip of this node
200          */
201         public static function determineOwnExternalIp () {
202                 // Is the external_ip config entry set?
203                 if (FrameworkConfiguration::getSelfInstance()->getConfigEntry('external_ip') != '') {
204                         // Use it as external ip
205                         $ip = FrameworkConfiguration::getSelfInstance()->getConfigEntry('external_ip');
206                 } else {
207                         // Determine own external ip by connecting to my (coder) server at 188.138.90.169
208                         $ip = ConsoleTools::determineExternalIp();
209                 }
210
211                 // Return it
212                 return $ip;
213         }
214
215         /**
216          * Determine IP or 'internal_ip' if set
217          *
218          * @return      $ip             The determined external ip of this node
219          */
220         public static function determineOwnInternalIp () {
221                 // Is the internal_ip config entry set?
222                 if (FrameworkConfiguration::getSelfInstance()->getConfigEntry('allow_publish_internal_ip') == 'N') {
223                         // Not allowed to publish internal IP, so use external
224                         $ip = self::determineOwnExternalIp();
225                 } elseif (FrameworkConfiguration::getSelfInstance()->getConfigEntry('internal_ip') != '') {
226                         // Use it as internal ip
227                         $ip = FrameworkConfiguration::getSelfInstance()->getConfigEntry('internal_ip');
228                 } else {
229                         // Determine own internal ip by connecting to my (coder) server at 188.138.90.169
230                         $ip = ConsoleTools::acquireSelfIPAddress();
231                 }
232
233                 // Return it
234                 return $ip;
235         }
236 }
237
238 // [EOF]
239 ?>