54 lines
1.3 KiB
PHP
54 lines
1.3 KiB
PHP
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<?php
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class mcpi{
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private const packet = "\x02\x00\x00\x00\x00\x00\x01\xbe\xdb\x00\xff\xff\x00\xfe\xfe\xfe\xfe\xfd\xfd\xfd\xfd\x12\x34\x56\x78";
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public function ping(string $ip, int $port = 19132, int $timeout = 3){
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if(!($sock = socket_create(AF_INET, SOCK_DGRAM, 0))){
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throw new Exception("Failed to connect");
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}
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if(!socket_sendto($sock, mcpi::packet, strlen(mcpi::packet), 0, $ip, $port)){
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throw new Exception("Failed to send data");
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}
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socket_set_option($sock, SOL_SOCKET, SO_RCVTIMEO, ["sec" => $timeout, "usec" => 0]);
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// get string size
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// for some reason, not using msg_peek makes the second
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// socket_recv call hang
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if(socket_recv($sock, $strlen, 36, MSG_PEEK | MSG_WAITALL) === false){
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throw new Exception("Failed to receive datalen");
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}
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$strlen = unpack("c", substr($strlen, 34, 35))[1];
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if(socket_recv($sock, $reply, (35 + $strlen), MSG_WAITALL) === false){
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throw new Exception("Failed to receive string");
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}
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$reply = substr($reply, 35, (35 + $strlen));
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$reply = explode(";", $reply);
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if(count($reply) !== 3){
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throw new Exception("Received malformed string");
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}
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$reply = [
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"game" => $reply[0],
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"type" => $reply[1],
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"name" => $reply[2]
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];
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return $reply;
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}
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}
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