php - 通过评论表单获取用户IP

Question

我在评论表单中插入了隐藏的输入:

$ip = $_SERVER['REMOTE_ADDR'];
<input type="hidden" name="c-ip" value="<?php echo $ip; ?>">

查询:

$cname = removeXSS(mysql_real_escape_string($_post['c-name']));
.
.
.
$sql = "INSERT INTO guestbook (id, date, name, email, comment, ip, status) VALUES (' ', NOW(), '$cname', '$cemail', '$ctext' , '$cip', ' ') ";

function RemoveXSS($val) {
 // remove all non-printable characters. CR(0a) and LF(0b) and TAB(9) are allowed
 // this prevents some character re-spacing such as <java\0script>
 // note that you have to handle splits with \n, \r, and \t later since they *are*   allowed in some inputs
 $val = preg_replace('/([\x00-\x08,\x0b-\x0c,\x0e-\x19])/', '', $val);

// straight replacements, the user should never need these since they're normal characters
// this prevents like <IMG SRC=&#X40&#X61&#X76&#X61&#X73&#X63&#X72&#X69&#X70&#X74&#X3A &#X61&#X6C&#X65&#X72&#X74&#X28&#X27&#X58&#X53&#X53&#X27&#X29>
$search = 'abcdefghijklmnopqrstuvwxyz';
$search .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$search .= '1234567890!@#$%^&*()';
$search .= '~`";:?+/={}[]-_|\'\\';
for ($i = 0; $i < strlen($search); $i++) {
  // ;? matches the ;, which is optional
  // 0{0,7} matches any padded zeros, which are optional and go up to 8 chars

  // &#x0040 @ search for the hex values
  $val = preg_replace('/(&#[xX]0{0,8}'.dechex(ord($search[$i])).';?)/i', $search[$i], $val); // with a ;
  // &#00064 @ 0{0,7} matches '0' zero to seven times
  $val = preg_replace('/(&#0{0,8}'.ord($search[$i]).';?)/', $search[$i], $val); // with a ;
}


$ra1 = Array('javascript', 'vbscript', 'expression', 'applet', 'meta', 'xml', 'blink', 'link', 'style', 'script', 'embed', 'object', 'iframe', 'frame', 'frameset', 'ilayer', 'layer', 'bgsound', 'title', 'base');
$ra2 = Array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavailable', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterchange', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmouseout', 'onmouseover', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowenter', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload');
$ra = array_merge($ra1, $ra2);

$found = true; // keep replacing as long as the previous round replaced something
while ($found == true) {
  $val_before = $val;
  for ($i = 0; $i < sizeof($ra); $i++) {
     $pattern = '/';
     for ($j = 0; $j < strlen($ra[$i]); $j++) {
        if ($j > 0) {
           $pattern .= '(';
           $pattern .= '(&#[xX]0{0,8}([9ab]);)';
           $pattern .= '|';
           $pattern .= '|(&#0{0,8}([9|10|13]);)';
           $pattern .= ')*';
        }
        $pattern .= $ra[$i][$j];
     }
     $pattern .= '/i';
     $replacement = substr($ra[$i], 0, 2).'<x>'.substr($ra[$i], 2); // add in <> to nerf the tag
     $val = preg_replace($pattern, $replacement, $val); // filter out the hex tags
     if ($val_before == $val) {
        // no replacements were made, so exit the loop
        $found = false;
     }
  }
}
return $val;

}

使用此输入，mysql 中的 ip 列为空。输入有什么问题。提前致谢

Answer 1

你读得怎么样，你在尝试这个吗:

echo $_POST['c-ip'];

并确保您根据表单的 method 属性使用正确的 super 全局变量。

您可能想查看您的数组以检查 IP 是否来自隐藏字段:

var_dump ($_POST);

或者

var_dump ($_REQUEST); // not a good idea though

更新

您也可以尝试一下:

$ip = $_SERVER['REMOTE_ADDR'];
$sql = "INSERT INTO guestbook (id, date, name, email, comment, ip, status) VALUES (' ', NOW(), '$cname', '$cemail', '$ctext' , '$ip', ' ') ";

您会看到，无需将 IP 保存在隐藏字段中并稍后存储，您可以随时从 PHP 的 super 全局数组中获取它。