prosody
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net/adns.lua

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net/adns.lua @ 980:b52d442161f2

net.adns: Flush buffer after sending DNS request
author Matthew Wild <mwild1@gmail.com>
date Sat, 11 Apr 2009 16:13:40 +0100
parent 973:b091a1a7273b
child 1005:0eed5db7758d
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4fd5d8f1657c net.adns: Add helper module for performing non-blocking DNS lookups
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1 local server = require "net.server";
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642af1bdf74e net.adns: Load the correct dns lib
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2 local dns = require "net.dns";
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3
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4 local log = require "util.logger".init("adns");
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5
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6 local coroutine, tostring, pcall = coroutine, tostring, pcall;
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8 module "adns"
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10 function lookup(handler, qname, qtype, qclass)
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11 return dns.peek(qname, qtype, qclass) or
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12 coroutine.wrap(function ()
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13 log("debug", "Records for "..qname.." not in cache, sending query (%s)...", tostring(coroutine.running()));
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14 dns.query(qname, qtype, qclass);
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15 coroutine.yield(nil); -- Wait for reply
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16 log("debug", "Reply for "..qname.." (%s)", tostring(coroutine.running()));
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17 local ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
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18 if not ok then
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19 log("debug", "Error in DNS response handler: %s", tostring(err));
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20 end
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21 end)();
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22 end
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23
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24 function new_async_socket(sock)
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25 local newconn = {};
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26 local listener = {};
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27 function listener.incoming(conn, data)
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28 dns.feed(sock, data);
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29 end
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30 function listener.disconnect()
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31 end
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32 newconn.handler, newconn._socket = server.wrapclient(sock, "dns", 53, listener);
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33 newconn.handler.settimeout = function () end
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34 newconn.handler.setsockname = function (_, ...) return sock:setsockname(...); end
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96de7f0a41cc net.adns: Set new send in net.server after 'connecting UDP' socket
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35 newconn.handler.setpeername = function (_, ...) local ret = sock:setpeername(...); _.setsend(sock.send); return ret; end
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36 newconn.handler.connect = function (_, ...) return sock:connect(...) end
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37 newconn.handler.send = function (_, data) _.write(data); return _.sendbuffer(); end
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38 return newconn.handler;
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39 end
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40
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41 dns:socket_wrapper_set(new_async_socket);
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24018ba2f7c0 net.adns: Return _M
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43 return _M;