prosody
1a4f14ea39b6
net/adns.lua

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net/adns.lua @ 2010:1a4f14ea39b6

mod_console: Fixed traceback occuring on using module:list on unknown hosts.
author Waqas Hussain <waqas20@gmail.com>
date Sun, 18 Oct 2009 18:10:05 +0500
parent 1901:3c52b949e472
child 2128:f107f0205793
child 2710:1600aff0839f
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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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14 local t_insert, t_remove = table.insert, table.remove;
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15 local coroutine, tostring, pcall = coroutine, tostring, pcall;
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17 module "adns"
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18
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19 function lookup(handler, qname, qtype, qclass)
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20 return coroutine.wrap(function (peek)
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21 if peek then
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22 log("debug", "Records for %s already cached, using those...", qname);
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23 handler(peek);
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24 return;
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25 end
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26 log("debug", "Records for %s not in cache, sending query (%s)...", qname, tostring(coroutine.running()));
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27 dns.query(qname, qtype, qclass);
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28 coroutine.yield({ qclass or "IN", qtype or "A", qname, coroutine.running()}); -- Wait for reply
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29 log("debug", "Reply for %s (%s)", qname, tostring(coroutine.running()));
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30 local ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
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31 if not ok then
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32 log("error", "Error in DNS response handler: %s", tostring(err));
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33 end
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34 end)(dns.peek(qname, qtype, qclass));
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35 end
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36
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37 function cancel(handle, call_handler)
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38 log("warn", "Cancelling DNS lookup for %s", tostring(handle[3]));
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39 dns.cancel(handle);
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40 if call_handler then
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41 coroutine.resume(handle[4]);
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42 end
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43 end
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44
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45 function new_async_socket(sock, resolver)
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46 local newconn, peername = {}, "<unknown>";
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47 local listener = {};
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48 function listener.incoming(conn, data)
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49 dns.feed(sock, data);
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50 end
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51 function listener.disconnect(conn, err)
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52 log("warn", "DNS socket for %s disconnected: %s", peername, err);
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53 local servers = resolver.server;
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54 if resolver.socketset[newconn.handler] == resolver.best_server and resolver.best_server == #servers then
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55 log("error", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]);
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56 end
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58 resolver:servfail(conn); -- Let the magic commence
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59 end
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60 newconn.handler, newconn._socket = server.wrapclient(sock, "dns", 53, listener);
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61 if not newconn.handler then
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62 log("warn", "handler is nil");
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63 end
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64 if not newconn._socket then
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65 log("warn", "socket is nil");
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66 end
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67 newconn.handler.settimeout = function () end
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68 newconn.handler.setsockname = function (_, ...) return sock:setsockname(...); end
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69 newconn.handler.setpeername = function (_, ...) peername = (...); local ret = sock:setpeername(...); _.setsend(sock.send); return ret; end
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70 newconn.handler.connect = function (_, ...) return sock:connect(...) end
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71 newconn.handler.send = function (_, data) _.write(data); return _.sendbuffer(); end
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72 return newconn.handler;
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73 end
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74
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75 dns:socket_wrapper_set(new_async_socket);
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76
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77 return _M;