개요
- is_port_open
- is_port_listen
- test set
- 8.8.8.8, 21 → false
- 8.8.8.8, 53 → true
Bash
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 $IS_PORT_OPEN
# true
C#
private bool isPortOpen(string host, int port) {
try {
TcpClient tc = new TcpClient();
tc.Connect(host, port);
}
catch {
return false;
}
return true;
}
PHP
function is_port_open($host, $port, $timeout=2) {
$result = @fsockopen($host, $port, $errno, $errstr, $timeout);
if($result) return true;
return false;
}