mirror of
https://github.com/minetest/minetest.git
synced 2024-12-11 17:03:16 +01:00
73 lines
2.3 KiB
Plaintext
73 lines
2.3 KiB
Plaintext
Minetest-c55 protocol (incomplete, early draft):
|
|
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:
|
|
- Actually this can be sent without the reliable packet header, too, i guess,
|
|
but the sequence number in the header allows the sender to re-send the
|
|
packet without accidentally getting a double initialization.
|
|
- Packet content:
|
|
# Basic header
|
|
u32 protocol_id = PROTOCOL_ID = 0x4f457403
|
|
u16 sender_peer_id = PEER_ID_INEXISTENT = 0
|
|
u8 channel = 0
|
|
# Reliable packet header
|
|
u8 type = TYPE_RELIABLE = 3
|
|
u16 seqnum = SEQNUM_INITIAL = 65500
|
|
# Original packet header
|
|
u8 type = TYPE_ORIGINAL = 1
|
|
# And no actual payload.
|
|
- Server responds with something like this:
|
|
- Packet content:
|
|
# Basic header
|
|
u32 protocol_id = PROTOCOL_ID = 0x4f457403
|
|
u16 sender_peer_id = PEER_ID_INEXISTENT = 0
|
|
u8 channel = 0
|
|
# Reliable packet header
|
|
u8 type = TYPE_RELIABLE = 3
|
|
u16 seqnum = SEQNUM_INITIAL = 65500
|
|
# Control packet header
|
|
u8 type = TYPE_CONTROL = 0
|
|
u8 controltype = CONTROLTYPE_SET_PEER_ID = 1
|
|
u16 peer_id_new = assigned peer id to client (other than 0 or 1)
|
|
- Then the connection can be disconnected by sending:
|
|
- Packet content:
|
|
# Basic header
|
|
u32 protocol_id = PROTOCOL_ID = 0x4f457403
|
|
u16 sender_peer_id = whatever was gotten in CONTROLTYPE_SET_PEER_ID
|
|
u8 channel = 0
|
|
# Control packet header
|
|
u8 type = TYPE_CONTROL = 0
|
|
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;
|
|
}
|
|
|