Should I check imput for bad chars in this case?

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Hi all,

this is more question than real problem (I hope :)). I include this
script into my pages to log IPs of visitors (they are saved info txt
file and send to e-mail later):

function getIPadress()
    if (isset($_SERVER["HTTP_CLIENT_IP"]))
        return $_SERVER["HTTP_CLIENT_IP"];
    elseif (isset($_SERVER["HTTP_X_FORWARDED_FOR"]))
        return $_SERVER["HTTP_X_FORWARDED_FOR"];
    elseif (isset($_SERVER["HTTP_X_FORWARDED"]))
        return $_SERVER["HTTP_X_FORWARDED"];
    elseif (isset($_SERVER["HTTP_FORWARDED_FOR"]))
        return $_SERVER["HTTP_FORWARDED_FOR"];
    elseif (isset($_SERVER["HTTP_FORWARDED"]))
        return $_SERVER["HTTP_FORWARDED"];
        return $_SERVER["REMOTE_ADDR"];

// save log to txt
$fh = fopen($fileWithLog, 'a+') or die("Oups " . $fileWithLog ." !");
$IPAdress = getIPadress();
fwrite($fh, date('j.n.Y G:i:s') . $IPAdress . " (" .
gethostbyaddr($IPAdress) . ")\n");

...can this be some possible security risk (XSS or so..), becose I
does not check chars in IP adress and host name mainly. It is probably
crazy, but on the other side I think it isn't imposibble to use some
bad strings in host name.

Would you recommend use "$IPAdress = htmlspecialchars(getIPadress());"
or something like? Or is it nonsense?

Thx and excuse me, if this question is too stupid :(. Br, Mir R.

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