validations.php

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<?php
/*
  $Id: validations.php,v 1.7 2002/03/16 14:42:36 project3000 Exp $

  网络商店 - 吉鑫网络
 http://www.chinaifc.com

Copyright (c) 2000,2001 网络商店

      汗化版权所有吉鑫网络
*/
  function tep_validate_email($email) {
    $valid_address = true;
    
    $mail_pat = '^(.+)@(.+)$';
    $valid_chars = "[^] \(\)<>@,;:\.\\\"\[]";
    $atom = "$valid_chars+";
    $quoted_user='(\"[^\"]*\")';
    $word = "($atom|$quoted_user)";
    $user_pat = "^$word(\.$word)*$";
    $ip_domain_pat='^\[([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\]$';
    $domain_pat = "^$atom(\.$atom)*$";
    
    if (eregi($mail_pat, $email, $components)) {
    
      $user = $components[1];
      $domain = $components[2];

      // validate user  
      if (eregi($user_pat, $user)) {
        // validate domain
        if (eregi($ip_domain_pat, $domain, $ip_components)) {
          // this is an IP address
      	  for ($i=1;$i<=4;$i++) {
      	    if ($ip_components[$i] > 255) {
      	      $valid_address = false;
      	      break;
      	    }
          }
        }
        else {
          // Domain is symbolic name
          if (eregi($domain_pat, $domain)) {
  
            /* domain name seems valid, but now make sure that it ends in a
               three-letter word (like com, net, org, gov, edu, int) or a two-letter word,
               representing country (ca, uk, nl), and that there's a hostname preceding 
               the domain or country. */
  
            $domain_components = explode(".", $domain);          
  
            // Make sure there's a host name preceding the domain.
            if (sizeof($domain_components) < 2)
              $valid_address = false;
            else {
              $top_level_domain = strtolower($domain_components[sizeof($domain_components)-1]);
              if (strlen($top_level_domain) < 2 || strlen($top_level_domain) > 6)
                $valid_address = false;
              elseif (strlen($top_level_domain) <= 6 && strlen($top_level_domain) >= 3) {
                switch ($top_level_domain) {
                  case 'com':
                  case 'net':
                  case 'org':
                  case 'gov':
                  case 'edu':
                  case 'int':
                  case 'biz':
                  case 'mil':
                  case 'info':
                  case 'name':
                  case 'aero':
                  case 'coop':
                  case 'museum':
                    break;
                  default:
                    $valid_address = false;
                    break;
                }
              }
            }
          }
          else {
      	    $valid_address = false;
      	  }
      	}
      }
      else {
        $valid_address = false;
      }
    }
    else
      $valid_address = false;

    if ($valid_address && ENTRY_EMAIL_ADDRESS_CHECK == 'true') {
      if (!checkdnsrr($domain, "MX") && !checkdnsrr($domain, "A")) {
        $valid_address = false;
      }
    }
    
    return $valid_address;
  }
?>