prosody
51be24b16e8a
net/adns.lua

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net/adns.lua @ 11050:51be24b16e8a

util.error: Allow optional tracebacks to be injected on errors This allows extra debug info to be provided for development purposes.
author Matthew Wild <mwild1@gmail.com>
date Fri, 28 Aug 2020 12:40:59 +0100
parent 10974:3b9d533da8fe
child 11217:65ce1178d655
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rev   line source
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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 new_resolver = require "net.dns".resolver;
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11 local promise = require "util.promise";
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12
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13 local log = require "util.logger".init("adns");
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14
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15 log("debug", "Using legacy DNS API (missing lua-unbound?)"); -- TODO write docs about luaunbound
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16 -- TODO Raise log level once packages are available
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17
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18 local coroutine, pcall = coroutine, pcall;
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19 local setmetatable = setmetatable;
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20
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21 local function dummy_send(sock, data, i, j) return (j-i)+1; end -- luacheck: ignore 212
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23 local _ENV = nil;
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24 -- luacheck: std none
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25
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26 local async_resolver_methods = {};
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27 local async_resolver_mt = { __index = async_resolver_methods };
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28
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29 local query_methods = {};
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30 local query_mt = { __index = query_methods };
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31
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32 local function new_async_socket(sock, resolver)
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33 local peername = "<unknown>";
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34 local listener = {};
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35 local handler = {};
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36 function listener.onincoming(conn, data) -- luacheck: ignore 212/conn
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37 if data then
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38 resolver:feed(handler, data);
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39 end
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40 end
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41 function listener.ondisconnect(conn, err)
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42 if err then
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43 log("warn", "DNS socket for %s disconnected: %s", peername, err);
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44 local servers = resolver.server;
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45 if resolver.socketset[conn] == resolver.best_server and resolver.best_server == #servers then
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46 log("error", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]);
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47 end
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48
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49 resolver:servfail(conn); -- Let the magic commence
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50 end
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51 end
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52 do
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53 local err;
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54 handler, err = server.wrapclient(sock, "dns", 53, listener);
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55 if not handler then
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56 return nil, err;
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57 end
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58 end
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59
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60 handler.settimeout = function () end
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61 handler.setsockname = function (_, ...) return sock:setsockname(...); end
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62 handler.setpeername = function (_, ...) peername = (...); local ret, err = sock:setpeername(...); _:set_send(dummy_send); return ret, err; end
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63 handler.connect = function (_, ...) return sock:connect(...) end
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64 --handler.send = function (_, data) _:write(data); return _.sendbuffer and _.sendbuffer(); end
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65 handler.send = function (_, data)
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66 log("debug", "Sending DNS query to %s", peername);
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67 return sock:send(data);
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68 end
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69 return handler;
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70 end
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71
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72 function async_resolver_methods:lookup(handler, qname, qtype, qclass)
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73 local resolver = self._resolver;
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74 return coroutine.wrap(function (peek)
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75 if peek then
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76 log("debug", "Records for %s already cached, using those...", qname);
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77 handler(peek);
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78 return;
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79 end
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80 log("debug", "Records for %s not in cache, sending query (%s)...", qname, coroutine.running());
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81 local ok, err = resolver:query(qname, qtype, qclass);
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82 if ok then
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83 coroutine.yield(setmetatable({ resolver, qclass or "IN", qtype or "A", qname, coroutine.running()}, query_mt)); -- Wait for reply
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84 log("debug", "Reply for %s (%s)", qname, coroutine.running());
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85 end
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86 if ok then
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87 ok, err = pcall(handler, resolver:peek(qname, qtype, qclass));
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88 else
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89 log("error", "Error sending DNS query: %s", err);
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90 ok, err = pcall(handler, nil, err);
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91 end
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92 if not ok then
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93 log("error", "Error in DNS response handler: %s", err);
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94 end
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95 end)(resolver:peek(qname, qtype, qclass));
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96 end
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97
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98 function async_resolver_methods:lookup_promise(qname, qtype, qclass)
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99 return promise.new(function (resolve, reject)
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100 local function handler(answer)
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101 if not answer then
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102 return reject();
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103 end
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104 resolve(answer);
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105 end
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106 self:lookup(handler, qname, qtype, qclass);
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107 end);
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108 end
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109
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110 function query_methods:cancel(call_handler, reason) -- luacheck: ignore 212/reason
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111 log("warn", "Cancelling DNS lookup for %s", self[4]);
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112 self[1].cancel(self[2], self[3], self[4], self[5], call_handler);
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113 end
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114
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115 local function new_async_resolver()
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116 local resolver = new_resolver();
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117 resolver:socket_wrapper_set(new_async_socket);
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118 return setmetatable({ _resolver = resolver}, async_resolver_mt);
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119 end
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120
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121 return {
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122 lookup = function (...)
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123 return new_async_resolver():lookup(...);
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diff changeset
124 end;
9a97dd174ec9 net.adns: Restructure to allow creating separate resolver objects, like net.dns
Matthew Wild <mwild1@gmail.com>
parents: 7475
diff changeset
125 resolver = new_async_resolver;
6780
647adfd8f738 net.*: Remove use of module() function
Kim Alvefur <zash@zash.se>
parents: 6510
diff changeset
126 new_async_socket = new_async_socket;
647adfd8f738 net.*: Remove use of module() function
Kim Alvefur <zash@zash.se>
parents: 6510
diff changeset
127 };