Updated 2011-06-18
A custom protocol over UDP.
+Integers are big endian.
+Refer to connection.{h,cpp} for further reference.
Initialization:
- A dummy reliable packet with peer_id=PEER_ID_INEXISTENT=0 is sent to the server:
u8 channel = 0
# Control packet header
u8 type = TYPE_CONTROL = 0
- u8 controltype = CONTROLTYPE_DISCO = 2
+ u8 controltype = CONTROLTYPE_DISCO = 3
+
+- 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;
+}