함수 is port open()

1 개요

is_port_open

is_port_listen

• test set

8.8.8.8, 21 → false

8.8.8.8, 53 → true

2 Bash

Bash

Copy

IP=8.8.8.8
PORT=53
TIMEOUT=2
IS_PORT_OPEN=`nc -z -w$TIMEOUT $IP $PORT`
if [ "$IS_PORT_OPEN" = "" ]
then
	IS_PORT_OPEN=false
else
	IS_PORT_OPEN=true
fi
echo $IS_PORT_OPEN
# true

3 C#

C#

Copy

private bool isPortOpen(string host, int port) {
   try {
       TcpClient tc = new TcpClient();
       tc.Connect(host, port);
   }
   catch {
       return false;
   }
   return true;
}

4 PHP

PHP

Copy

function is_port_open($host, $port, $timeout=2) {
  $resyntaxhighlight = @fsockopen($host, $port, $errno, $errstr, $timeout);
  if($resyntaxhighlight)	return true;
  return false;
}

5 같이 보기

• is_ping()
• 리눅스 로컬서버 열린 포트 확인