boolean globFlag = false;
int tempPort = Integer.valueOf(port);
//获取设备所有网口的ip地址
Enumeration allNetInterfaces = null;
try {
allNetInterfaces = NetworkInterface.getNetworkInterfaces();
} catch (java.net.SocketException e) {
e.printStackTrace();
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
Enumeration addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()){
ip = (InetAddress) addresses.nextElement();
if(ip!=null && ip instanceof Inet4Address){
String ipAddress = ip.getHostAddress();
log.error("ip:-------"+ipAddress);
try{
Socket socket = new Socket(ipAddress,tempPort);
globFlag = true;
}catch (Exception e) {
// TODO: handle exception
}
if(globFlag){
break;
}
}
}
if(globFlag){
break;
}
}
if(globFlag){
response.setContentType("text/json;charset=UTF-8");
response.getWriter().write(
"{\"success\":"
+ false
+ ",\"msg\":\""
+ "该端口已经被占用" + "\"}");
return null;
int tempPort = Integer.valueOf(port);
//获取设备所有网口的ip地址
Enumeration allNetInterfaces = null;
try {
allNetInterfaces = NetworkInterface.getNetworkInterfaces();
} catch (java.net.SocketException e) {
e.printStackTrace();
}
//检测每一个网口上的这个端口是否可以连接上
InetAddress ip = null;while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
Enumeration addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()){
ip = (InetAddress) addresses.nextElement();
if(ip!=null && ip instanceof Inet4Address){
String ipAddress = ip.getHostAddress();
log.error("ip:-------"+ipAddress);
try{
Socket socket = new Socket(ipAddress,tempPort);
globFlag = true;
}catch (Exception e) {
// TODO: handle exception
}
if(globFlag){
break;
}
}
}
if(globFlag){
break;
}
}
if(globFlag){
response.setContentType("text/json;charset=UTF-8");
response.getWriter().write(
"{\"success\":"
+ false
+ ",\"msg\":\""
+ "该端口已经被占用" + "\"}");
return null;
}
说明:这种用java的方式去检测linux下的端口 的占用情况存在漏洞,原因就是DNS端口53却没有被检测到,
可以使用 netstat -nap|grep 53 命令去查看,会发现该设备上的所有的网口对应的ip上的端口虽然是没有进程在使用的;
但是该端口是不能作为web服务的端口,因为一旦用web使用该端口号,可以查看到web进程是启动起来的,但是DNS端口就被web占用了,
从而形成死锁,无法访问到web服务。