+- Here's a quick untested connect-disconnect done in PHP:
+# host: ip of server (use gethostbyname(hostname) to get from a dns name)
+# port: port of server
+function check_if_minetestserver_up($host, $port)
+{
+ $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
+ $timeout = array("sec" => 1, "usec" => 0);
+ socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, $timeout);
+ $buf = "\x4f\x45\x74\x03\x00\x00\x00\x03\xff\xdc\x01";
+ socket_sendto($socket, $buf, strlen($buf), 0, $host, $port);
+ $buf = socket_read($socket, 1000);
+ if($buf != "")
+ {
+ # We got a reply! read the peer id from it.
+ $peer_id = substr($buf, 9, 2);
+
+ # Disconnect
+ $buf = "\x4f\x45\x74\x03".$peer_id."\x00\x00\x03";
+ socket_sendto($socket, $buf, strlen($buf), 0, $host, $port);
+ socket_close($socket);
+
+ return true;
+ }
+ return false;
+}
+
+- Here's a Python script for checking if a minetest server is up, confirmed working
+#!/usr/bin/env python
+import sys, time, socket
+address = ""
+port = 30000
+if len(sys.argv) <= 1:
+ print("Usage: %s <address>" % sys.argv[0])
+ exit()
+if ':' in sys.argv[1]:
+ address = sys.argv[1].split(':')[0]
+ try:
+ port = int(sys.argv[1].split(':')[1])
+ except ValueError:
+ print("Please specify a valid port")
+ exit()
+else:
+ address = sys.argv[1]
+
+try:
+ start = time.time()
+ sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+ sock.settimeout(2.0)
+ buf = "\x4f\x45\x74\x03\x00\x00\x00\x01"
+ sock.sendto(buf, (address, port))
+ data, addr = sock.recvfrom(1000)
+ if data:
+ peer_id = data[12:14]
+ buf = "\x4f\x45\x74\x03" + peer_id + "\x00\x00\x03"
+ sock.sendto(buf, (address, port))
+ sock.close()
+ end = time.time()
+ print("%s is up (%0.5fms)" % (sys.argv[1],end-start))
+ else:
+ print("%s seems to be down " % sys.argv[1])
+except:
+ print("%s seems to be down " % sys.argv[1])