. // // Alexey A.Znayev, znaeff@mail.ru, http://xbsoft.org, http://xbsoft.ru // /////////////////////////////////////////////////////////////////////////// // This file contains public class DNSBL // This class performs IP address check in spam blocking lists as described // on http://ru.wikipedia.org/wiki/RBL class DNSBL { private $_aCheckers = array( // list of checkers available for individual checking 'spamhaus' => array('.zen.spamhaus.org', true), //available for group checking with 'all' key 'spamcop' => array('.bl.spamcop.net', true), //available for group checking with 'all' key 'dsbl' => array('.list.dsbl.org', false), //not available for group checking with 'all' key 'ordb' => array('.relays.ordb.org', false), //not available for group checking with 'all' key 'sorbs' => array('.dnsbl.sorbs.net', false), //not available for group checking with 'all' key 'njabl' => array('.dnsbl.njabl.org', false) //not available for group checking with 'all' key ); // AZ - 1. Key 'all' is illegal // AZ - 2. Most of spammer IP addresses is covered by 'spamhaus' & 'spamcop' (and they are fast), // some of the rest may not work sometimes, you can make them group checking available after individual testing private $_sDefaultChecker = 'spamhaus'; /////////////////////////////////////////////////////////////////////////// // CheckSpamIP - check IP for spam in checkers : given, default or all available for group checking (may be slow) // parameters: // string $ip - ip address // string $checker - checker name or 'all' or nothing // returns: // true when IP exitsts in spam-lists of $checker or at least one of all checkers // false when not or when ip address is local or not correct public function CheckSpamIP($ip, $checker = ''){ if(empty($ip)) return false; if(preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $ip) != 1) return false; $octets = explode('.', $ip); if($octets[0] == '127') return false; if($octets[0] == '10') return false; if($octets[0] == '192' && $octets[0] == '168') return false; if($octets[0] == '169' && $octets[0] == '254') return false; // ms windows if((int)$octets[0] > 255 || (int)$octets[1] > 255 || (int)$octets[2] > 255 || (int)$octets[3] > 255 ) return false; $ret_val = false; $PTR = implode(array_reverse($octets), '.'); if($checker === 'all'){ foreach(array_values($this->_aCheckers) as $c){ if($c[1]){ $ret_val = $ret_val || $this->_CheckDNSAnswer(dns_get_record($PTR . $c[0], DNS_A)); } if($ret_val) break; } }else if(array_key_exists($checker, $this->_aCheckers)){ $ret_val = $this->_CheckDNSAnswer(dns_get_record($PTR . $this->_aCheckers[$checker][0], DNS_A)); }else{ $ret_val = $this->_CheckDNSAnswer(dns_get_record($PTR . $this->_aCheckers[$this->_sDefaultChecker][0], DNS_A)); } return $ret_val; } /////////////////////////////////////////////////////////////////////////// // GetCheckers - gets list of available checker names // returns: // array of strings public function GetCheckers(){ return array_keys($this->_aCheckers); } /////////////////////////////////////////////////////////////////////////// // GetGroupCheckers - gets list of checker names available for group checking with 'all' key // returns: // array of strings public function GetGroupCheckers(){ $ret_val = array(); foreach(array_keys($this->_aCheckers) as $k) if($this->_aCheckers[$k][1]) array_push($ret_val, $k); return $ret_val; } /////////////////////////////////////////////////////////////////////////// // GetDefaultChecker - gets default checker name // returns: // string public function GetDefaultChecker(){ return $this->_sDefaultChecker; } /////////////////////////////////////////////////////////////////////////// // SetDefaultChecker - sets default checker name // parameters: // string $new_checker - new default checker name // returns: // true when success // false when failed ($new_checker is not in the list of available checker names) public function SetDefaultChecker($new_checker){ if(array_key_exists($new_checker, $this->_aCheckers)){ $this->_sDefaultChecker = $new_checker; return true; }else{ return false; } } /////////////////////////////////////////////////////////////////////////// // EnableGroupChecking - sets checker available for group checking // parameters: // string $checker - checker name // returns: // true when success ($checker is included) // false when failed ($checker is not in the list of available checker names) public function EnableGroupChecking($checker){ if(array_key_exists($checker, $this->_aCheckers)){ $this->_aCheckers[$checker][1] = true; return true; }else{ return false; } } /////////////////////////////////////////////////////////////////////////// // DisableGroupChecking - sets checker not available for group checking // parameters: // string $checker - checker name // returns: // true when success ($checker is excluded) // false when failed ($checker is not in the list of available checker names) public function DisableGroupChecking($checker){ if(array_key_exists($checker, $this->_aCheckers)){ $this->_aCheckers[$checker][1] = false; return true; }else{ return false; } } // private methods /////////////////////////////////////////////////////////////////////////// // _CheckDNSAnswer - checks DNS-server answer for 127.0.0.* values // returns: // true when success // false when failed private function _CheckDNSAnswer($dns_answer){ if(!is_array($dns_answer)) return false; $len = count($dns_answer); if($len <= 0) return false; for($i=0; $i<$len; $i++){ $obj = $dns_answer[$i]; if(!(is_object($obj) || is_array($obj))) return false; $ip_str = $obj['ip']; if(!is_string($ip_str)) return false; $pos = strpos($ip_str, '127.0.0.'); if($pos !== false) return true; } return false; } } // end of class DNSBL ?> Microsoft Mathematics, el Mathematica simple y gratuito

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Microsoft Mathematics, el Mathematica simple y gratuito

enero 20, 2011 Posted in  Software, Universidad, Windows | Comments: 2

Cuando alguien estudia y se tiene que enfrentar a cálculos para comprobar soluciones o simplemente llegar hasta un cierto punto más rápido, este tipo de soluciones le viene como anillo al dedo.

Con Microsoft Mathematics tendrás algo más de facilidad. El programa nos puede ayudar a:

  • Resolver funciones básicas como raíces y logaritmos
  • Resolver ecuaciones (y conjunto de ecuaciones) y desigualdades
  • Resolver triángulos
  • Conversiones de unidades
  • Funciones trigonométricas
  • Operaciones sobre vectores y matrices
  • Resolver funciones estadísticas básicas
  • Operaciones con números complejos
  • Dibujar gráficas en 2D y 3D en coordenadas cartesianas, polares, cilíndricas y esféricas
  • Integrales y derivadas

Resumiendo, buena alternativa al pesado Mathematica de Wolfram y a otros programas tipo Derive. El programa es gratuito, y se encuentra tanto para 32 como para 64 bits.

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2 comments to Microsoft Mathematics, el Mathematica simple y gratuito

  • enero 20, 2011 at 5:59 pm
    iSVQ  says:

    Me lo apunto, me lo bajo, me lo guardo y me lo miro… Jejejeje

    Reply

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