prosody
38053bf1630d
net/adns.lua

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net/adns.lua @ 7952:38053bf1630d

luacheckrc: Include entire module API
author Kim Alvefur <zash@zash.se>
date Mon, 06 Mar 2017 15:11:37 +0100
parent 7475:ee878fa78b8b
child 8266:9a97dd174ec9
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 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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15
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16 local function dummy_send(sock, data, i, j) return (j-i)+1; end
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17
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18 local _ENV = nil;
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19
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20 local function lookup(handler, qname, qtype, qclass)
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21 return coroutine.wrap(function (peek)
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22 if peek then
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23 log("debug", "Records for %s already cached, using those...", qname);
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24 handler(peek);
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25 return;
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26 end
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27 log("debug", "Records for %s not in cache, sending query (%s)...", qname, tostring(coroutine.running()));
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28 local ok, err = dns.query(qname, qtype, qclass);
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29 if ok then
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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 end
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33 if ok then
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34 ok, err = pcall(handler, dns.peek(qname, qtype, qclass));
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35 else
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36 log("error", "Error sending DNS query: %s", err);
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37 ok, err = pcall(handler, nil, err);
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38 end
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39 if not ok then
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40 log("error", "Error in DNS response handler: %s", tostring(err));
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41 end
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42 end)(dns.peek(qname, qtype, qclass));
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43 end
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44
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45 local function cancel(handle, call_handler, reason)
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46 log("warn", "Cancelling DNS lookup for %s", tostring(handle[3]));
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47 dns.cancel(handle[1], handle[2], handle[3], handle[4], call_handler);
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48 end
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49
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50 local function new_async_socket(sock, resolver)
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51 local peername = "<unknown>";
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52 local listener = {};
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53 local handler = {};
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54 local err;
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55 function listener.onincoming(conn, data)
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56 if data then
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57 dns.feed(handler, data);
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58 end
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59 end
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60 function listener.ondisconnect(conn, err)
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61 if err then
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62 log("warn", "DNS socket for %s disconnected: %s", peername, err);
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63 local servers = resolver.server;
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64 if resolver.socketset[conn] == resolver.best_server and resolver.best_server == #servers then
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65 log("error", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]);
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66 end
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67
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68 resolver:servfail(conn); -- Let the magic commence
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69 end
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70 end
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71 handler, err = server.wrapclient(sock, "dns", 53, listener);
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72 if not handler then
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73 return nil, err;
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74 end
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75
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76 handler.settimeout = function () end
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77 handler.setsockname = function (_, ...) return sock:setsockname(...); end
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78 handler.setpeername = function (_, ...) peername = (...); local ret, err = sock:setpeername(...); _:set_send(dummy_send); return ret, err; end
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79 handler.connect = function (_, ...) return sock:connect(...) end
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80 --handler.send = function (_, data) _:write(data); return _.sendbuffer and _.sendbuffer(); end
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81 handler.send = function (_, data)
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82 log("debug", "Sending DNS query to %s", peername);
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83 return sock:send(data);
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84 end
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85 return handler;
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86 end
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87
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88 dns.socket_wrapper_set(new_async_socket);
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89
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90 return {
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91 lookup = lookup;
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92 cancel = cancel;
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93 new_async_socket = new_async_socket;
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94 };