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  1. <?php
  2.  
  3. function checkATT() {
  4. $ipaddy = $_SERVER['REMOTE_ADDR'];
  5. /*echo $ipaddy;
  6. echo ip_in_range($ipaddy, '12.20.0.0/8');
  7. echo ip_in_range($ipaddy, '76.192.0.0/10');
  8. echo ip_in_range($ipaddy, '68.88.0.0/13');
  9. echo ip_in_range($ipaddy, '75.0.0.0/10');
  10. echo ip_in_range($ipaddy, '99.128.0.0/10'); */
  11. if (ip_in_range($ipaddy, '209.0.0.0/10') ||ip_in_range($ipaddy, '99.128.0.0/10') || ip_in_range($ipaddy, '75.0.0.0/10') || ip_in_range($ipaddy, '68.88.0.0/13') || ip_in_range($ipaddy, '76.192.0.0/10') || ip_in_range($ipaddy, '12.20.0.0/8')) {
  12. echo 'Link to informative article or redirect to same.';
  13. } else {
  14. echo '<!-- Probably nothing here, to not bother non-ATT customers. -->';
  15. }
  16.  
  17. }
  18.  
  19. /*
  20. * ip_in_range.php - Function to determine if an IP is located in a
  21. * specific range as specified via several alternative
  22. * formats.
  23. *
  24. * Network ranges can be specified as:
  25. * 1. Wildcard format: 1.2.3.*
  26. * 2. CIDR format: 1.2.3/24 OR 1.2.3.4/255.255.255.0
  27. * 3. Start-End IP format: 1.2.3.0-1.2.3.255
  28. *
  29. * Return value BOOLEAN : ip_in_range($ip, $range);
  30. *
  31. * Copyright 2008: Paul Gregg <pgregg@pgregg.com>
  32. * 10 January 2008
  33. * Version: 1.2
  34. *
  35. * Source website: http://www.pgregg.com/projects/php/ip_in_range/
  36. * Version 1.2
  37. *
  38. * This software is Donationware - if you feel you have benefited from
  39. * the use of this tool then please consider a donation. The value of
  40. * which is entirely left up to your discretion.
  41. * http://www.pgregg.com/donate/
  42. *
  43. * Please do not remove this header, or source attibution from this file.
  44. */
  45.  
  46.  
  47. // decbin32
  48. // In order to simplify working with IP addresses (in binary) and their
  49. // netmasks, it is easier to ensure that the binary strings are padded
  50. // with zeros out to 32 characters - IP addresses are 32 bit numbers
  51. Function decbin32 ($dec) {
  52. return str_pad(decbin($dec), 32, '0', STR_PAD_LEFT);
  53. }
  54.  
  55. // ip_in_range
  56. // This function takes 2 arguments, an IP address and a "range" in several
  57. // different formats.
  58. // Network ranges can be specified as:
  59. // 1. Wildcard format: 1.2.3.*
  60. // 2. CIDR format: 1.2.3/24 OR 1.2.3.4/255.255.255.0
  61. // 3. Start-End IP format: 1.2.3.0-1.2.3.255
  62. // The function will return true if the supplied IP is within the range.
  63. // Note little validation is done on the range inputs - it expects you to
  64. // use one of the above 3 formats.
  65. Function ip_in_range($ip, $range) {
  66. if (strpos($range, '/') !== false) {
  67. // $range is in IP/NETMASK format
  68. list($range, $netmask) = explode('/', $range, 2);
  69. if (strpos($netmask, '.') !== false) {
  70. // $netmask is a 255.255.0.0 format
  71. $netmask = str_replace('*', '0', $netmask);
  72. $netmask_dec = ip2long($netmask);
  73. return ( (ip2long($ip) & $netmask_dec) == (ip2long($range) & $netmask_dec) );
  74. } else {
  75. // $netmask is a CIDR size block
  76. // fix the range argument
  77. $x = explode('.', $range);
  78. while(count($x)<4) $x[] = '0';
  79. list($a,$b,$c,$d) = $x;
  80. $range = sprintf("%u.%u.%u.%u", empty($a)?'0':$a, empty($b)?'0':$b,empty($c)?'0':$c,empty($d)?'0':$d);
  81. $range_dec = ip2long($range);
  82. $ip_dec = ip2long($ip);
  83.  
  84. # Strategy 1 - Create the netmask with 'netmask' 1s and then fill it to 32 with 0s
  85. #$netmask_dec = bindec(str_pad('', $netmask, '1') . str_pad('', 32-$netmask, '0'));
  86.  
  87. # Strategy 2 - Use math to create it
  88. $wildcard_dec = pow(2, (32-$netmask)) - 1;
  89. $netmask_dec = ~ $wildcard_dec;
  90.  
  91. return (($ip_dec & $netmask_dec) == ($range_dec & $netmask_dec));
  92. }
  93. } else {
  94. // range might be 255.255.*.* or 1.2.3.0-1.2.3.255
  95. if (strpos($range, '*') !==false) { // a.b.*.* format
  96. // Just convert to A-B format by setting * to 0 for A and 255 for B
  97. $lower = str_replace('*', '0', $range);
  98. $upper = str_replace('*', '255', $range);
  99. $range = "$lower-$upper";
  100. }
  101.  
  102. if (strpos($range, '-')!==false) { // A-B format
  103. list($lower, $upper) = explode('-', $range, 2);
  104. $lower_dec = (float)sprintf("%u",ip2long($lower));
  105. $upper_dec = (float)sprintf("%u",ip2long($upper));
  106. $ip_dec = (float)sprintf("%u",ip2long($ip));
  107. return ( ($ip_dec>=$lower_dec) && ($ip_dec<=$upper_dec) );
  108. }
  109.  
  110. echo 'Range argument is not in 1.2.3.4/24 or 1.2.3.4/255.255.255.0 format';
  111. return false;
  112. }
  113.  
  114. }
  115.  
  116. checkATT();
  117.  
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