prosody
cbc58fc170ad
net/adns.lua

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net/adns.lua @ 2652:cbc58fc170ad

net.adns: Fix potential traceback on DNS responses with libevent enabled (thanks Flo)
author Matthew Wild <mwild1@gmail.com>
date Tue, 16 Feb 2010 15:05:18 +0000
parent 2578:61e5eff54415
child 2661:be4b1e796bd2
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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 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 local function dummy_send(sock, data, i, j) return (j-i)+1; end
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18
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19 module "adns"
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20
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21 function lookup(handler, qname, qtype, qclass)
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22 return coroutine.wrap(function (peek)
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23 if peek then
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24 log("debug", "Records for %s already cached, using those...", qname);
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25 handler(peek);
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26 return;
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27 end
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28 log("debug", "Records for %s not in cache, sending query (%s)...", qname, tostring(coroutine.running()));
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29 dns.query(qname, qtype, qclass);
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30 coroutine.yield({ qclass or "IN", qtype or "A", qname, coroutine.running()}); -- Wait for reply
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31 log("debug", "Reply for %s (%s)", qname, tostring(coroutine.running()));
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32 local ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
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33 if not ok then
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34 log("error", "Error in DNS response handler: %s", tostring(err));
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35 end
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36 end)(dns.peek(qname, qtype, qclass));
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37 end
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38
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39 function cancel(handle, call_handler)
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40 log("warn", "Cancelling DNS lookup for %s", tostring(handle[3]));
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41 dns.cancel(handle);
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42 if call_handler then
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43 coroutine.resume(handle[4]);
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44 end
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45 end
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46
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47 function new_async_socket(sock, resolver)
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48 local peername = "<unknown>";
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49 local listener = {};
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50 local handler = {};
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51 function listener.onincoming(conn, data)
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52 if data then
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53 dns.feed(handler, data);
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54 end
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55 end
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56 function listener.ondisconnect(conn, err)
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57 log("warn", "DNS socket for %s disconnected: %s", peername, err);
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58 local servers = resolver.server;
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59 if resolver.socketset[conn] == resolver.best_server and resolver.best_server == #servers then
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60 log("error", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]);
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61 end
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63 resolver:servfail(conn); -- Let the magic commence
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64 end
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65 handler = server.wrapclient(sock, "dns", 53, listener);
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66 if not handler then
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67 log("warn", "handler is nil");
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68 end
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70 handler.settimeout = function () end
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71 handler.setsockname = function (_, ...) return sock:setsockname(...); end
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72 handler.setpeername = function (_, ...) peername = (...); local ret = sock:setpeername(...); _:set_send(dummy_send); return ret; end
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73 handler.connect = function (_, ...) return sock:connect(...) end
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74 --handler.send = function (_, data) _:write(data); return _.sendbuffer and _.sendbuffer(); end
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75 handler.send = function (_, data) return sock:send(data); end
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76 return handler;
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77 end
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78
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79 dns.socket_wrapper_set(new_async_socket);
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81 return _M;