prosody
c3fb802f9e45
net/adns.lua

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net/adns.lua @ 11491:c3fb802f9e45

mod_http_file_share: Report number of items in caches to statsmanager This is neat, O(1) reporting, why don't we do this everywhere? Gives you an idea of how much stuff is in the caches, which may help inform decisions on whether the size is appropriate.
author Kim Alvefur <zash@zash.se>
date Sun, 28 Mar 2021 13:15:11 +0200
parent 11267:97077089f3c2
child 12974:ba409c67353b
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rev   line source
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Matthew Wild <mwild1@gmail.com>
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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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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("warn", "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 if handler.set then
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60 -- server_epoll: only watch for incoming data
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61 -- avoids sending empty packet on first 'onwritable' event
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62 handler:set(true, false);
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63 end
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64
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65 handler.settimeout = function () end
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66 handler.setsockname = function (_, ...) return sock:setsockname(...); end
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67 handler.setpeername = function (_, ...) peername = (...); local ret, err = sock:setpeername(...); _:set_send(dummy_send); return ret, err; end
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68 handler.connect = function (_, ...) return sock:connect(...) end
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69 --handler.send = function (_, data) _:write(data); return _.sendbuffer and _.sendbuffer(); end
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70 handler.send = function (_, data)
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71 log("debug", "Sending DNS query to %s", peername);
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72 return sock:send(data);
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73 end
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74 return handler;
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75 end
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76
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77 function async_resolver_methods:lookup(handler, qname, qtype, qclass)
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78 local resolver = self._resolver;
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79 return coroutine.wrap(function (peek)
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80 if peek then
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81 log("debug", "Records for %s already cached, using those...", qname);
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82 handler(peek);
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83 return;
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84 end
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85 log("debug", "Records for %s not in cache, sending query (%s)...", qname, coroutine.running());
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86 local ok, err = resolver:query(qname, qtype, qclass);
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87 if ok then
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88 coroutine.yield(setmetatable({ resolver, qclass or "IN", qtype or "A", qname, coroutine.running()}, query_mt)); -- Wait for reply
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89 log("debug", "Reply for %s (%s)", qname, coroutine.running());
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90 end
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91 if ok then
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92 ok, err = pcall(handler, resolver:peek(qname, qtype, qclass));
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93 else
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94 log("error", "Error sending DNS query: %s", err);
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95 ok, err = pcall(handler, nil, err);
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96 end
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97 if not ok then
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98 log("error", "Error in DNS response handler: %s", err);
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99 end
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100 end)(resolver:peek(qname, qtype, qclass));
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101 end
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102
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103 function async_resolver_methods:lookup_promise(qname, qtype, qclass)
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104 return promise.new(function (resolve, reject)
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105 local function handler(answer)
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106 if not answer then
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107 return reject();
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108 end
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109 resolve(answer);
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110 end
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111 self:lookup(handler, qname, qtype, qclass);
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112 end);
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113 end
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114
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115 function query_methods:cancel(call_handler, reason) -- luacheck: ignore 212/reason
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116 log("warn", "Cancelling DNS lookup for %s", self[4]);
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117 self[1].cancel(self[2], self[3], self[4], self[5], call_handler);
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118 end
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119
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120 local function new_async_resolver()
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121 local resolver = new_resolver();
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122 resolver:socket_wrapper_set(new_async_socket);
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123 return setmetatable({ _resolver = resolver}, async_resolver_mt);
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124 end
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125
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126 return {
8266
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127 lookup = function (...)
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128 return new_async_resolver():lookup(...);
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129 end;
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130 resolver = new_async_resolver;
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131 new_async_socket = new_async_socket;
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132 };