prosody
0372bf35dcb3
net/adns.lua

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net/adns.lua @ 1760:0372bf35dcb3

Merged with Tobias
author Waqas Hussain <waqas20@gmail.com>
date Mon, 07 Sep 2009 23:28:25 +0500
parent 1715:3a5b6cd6b8c9
child 1788:45779d67c26c
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1522
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local server = require "net.server";
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10 local dns = require "net.dns";
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12 local log = require "util.logger".init("adns");
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13
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14 local coroutine, tostring, pcall = coroutine, tostring, pcall;
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16 module "adns"
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17
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18 function lookup(handler, qname, qtype, qclass)
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19 return coroutine.wrap(function (peek)
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20 if peek then
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21 log("debug", "Records for %s already cached, using those...", qname);
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22 handler(peek);
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23 return;
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24 end
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25 log("debug", "Records for %s not in cache, sending query (%s)...", qname, tostring(coroutine.running()));
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26 dns.query(qname, qtype, qclass);
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27 coroutine.yield({ qclass or "IN", qtype or "A", qname, coroutine.running()}); -- Wait for reply
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28 log("debug", "Reply for %s (%s)", qname, tostring(coroutine.running()));
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29 local ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
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30 if not ok then
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31 log("debug", "Error in DNS response handler: %s", tostring(err));
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32 end
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33 end)(dns.peek(qname, qtype, qclass));
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34 end
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35
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36 function cancel(handle, call_handler)
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37 log("warn", "Cancelling DNS lookup for %s", tostring(handle[3]));
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38 dns.cancel(handle);
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39 if call_handler then
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40 coroutine.resume(handle[4]);
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41 end
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42 end
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43
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44 function new_async_socket(sock)
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45 local newconn = {};
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46 local listener = {};
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47 function listener.incoming(conn, data)
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48 dns.feed(sock, data);
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49 end
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50 function listener.disconnect()
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51 end
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52 newconn.handler, newconn._socket = server.wrapclient(sock, "dns", 53, listener);
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53 if not newconn.handler then
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54 log("warn", "handler is nil");
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55 end
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56 if not newconn._socket then
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57 log("warn", "socket is nil");
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58 end
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59 newconn.handler.settimeout = function () end
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60 newconn.handler.setsockname = function (_, ...) return sock:setsockname(...); end
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61 newconn.handler.setpeername = function (_, ...) local ret = sock:setpeername(...); _.setsend(sock.send); return ret; end
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62 newconn.handler.connect = function (_, ...) return sock:connect(...) end
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63 newconn.handler.send = function (_, data) _.write(data); return _.sendbuffer(); end
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64 return newconn.handler;
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65 end
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66
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67 dns:socket_wrapper_set(new_async_socket);
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68
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69 return _M;