prosody
d5f322dd424b
net/adns.lua

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net/adns.lua @ 13110:d5f322dd424b 0.12

mod_s2s: Add event where resolver for s2sout can be tweaked Could be used to implement custom connection methods (c.f. mod_onions) without needing to duplicate the rest of route_to_new_session(). Adds a feature to enable detection since it can be difficult to detect support for an event otherwise.
author Kim Alvefur <zash@zash.se>
date Thu, 18 Aug 2022 03:26:32 +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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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("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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24018ba2f7c0 net.adns: Return _M
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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 };