PHP调用系统命令修改IP,netmask,gateway,mac,dns

ip_contrl.php:
<?php
 //include('header.php');
 
 $ipaddr = $_POST['ipaddr'];
 $netmask = $_POST['netmask'];
 $gateway = $_POST['gateway'];
 $mac = $_POST['mac'];
 $dns1 = $_POST['dns1'];
 $dns2 = $_POST['dns2'];
 //echo "ipaddr=$ipaddr;netmask=$netmask<br>";
 
 if( $ipaddr && $netmask && $gateway && $mac && $dns1 && $dns2 )
 {
  system("./ip/changeip 1 $ipaddr $netmask $gateway $mac $dns1 $dns2");
  
  echo "<script type='text/javascript'>
    alert( '网络配置成功！' );
    window.location.href = 'service_manage.php?id=2';
     </script>";
 }
 else
 {
  exec("ifconfig eth0", $res);
  
  $str = explode( "HWaddr ",$res[0] );
  $macaddr = $str[1];    //mac地址
  //echo "str[1]=".$str[1]."<br>";  
  
  $s = explode( "addr:",$res[1] );  
  $s1 = explode( "  Bcast:",$s[1] );
  $ipaddr = $s1[0];  //ip地址
  //echo "s1[0]=".$s1[0]."<br>";
  $s2 = explode( "Mask:",$s1[1] );
  $netmask = $s2[1];  //子网掩码
  //echo "s2[1]=".$s2[1]."<br>";
 }
?>
<script language="javascript">
function checkFormData()
{
   if ( form1.ipaddr.value == "")
 {
  alert ( "IP地址不能为空！" );
  form1.ipaddr.focus();
  return false;
 } 
 if ( form1.ipaddr.value.search (".*?((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d).*?") != 0 )
 {
  alert ( "IP格式不正确！" );  
  form1.ipaddr.focus();
  return false; 
   }
 
 if ( form1.netmask.value