prosody
197ba9539390
net/adns.lua

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net/adns.lua @ 10657:197ba9539390

mod_admin_telnet: Reflow hosts filter for readability
author Kim Alvefur <zash@zash.se>
date Sat, 22 Feb 2020 18:23:38 +0100
parent 10614:431511e190bc
child 10966:97de279ca01a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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13 local log = require "util.logger".init("adns");
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14
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15 local coroutine, pcall = coroutine, pcall;
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16 local setmetatable = setmetatable;
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17
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18 local function dummy_send(sock, data, i, j) return (j-i)+1; end -- luacheck: ignore 212
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19
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20 local _ENV = nil;
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21 -- luacheck: std none
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23 local async_resolver_methods = {};
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24 local async_resolver_mt = { __index = async_resolver_methods };
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25
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26 local query_methods = {};
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27 local query_mt = { __index = query_methods };
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28
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29 local function new_async_socket(sock, resolver)
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30 local peername = "<unknown>";
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31 local listener = {};
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32 local handler = {};
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33 function listener.onincoming(conn, data) -- luacheck: ignore 212/conn
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34 if data then
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35 resolver:feed(handler, data);
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36 end
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37 end
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38 function listener.ondisconnect(conn, err)
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39 if err then
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40 log("warn", "DNS socket for %s disconnected: %s", peername, err);
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41 local servers = resolver.server;
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42 if resolver.socketset[conn] == resolver.best_server and resolver.best_server == #servers then
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43 log("error", "Exhausted all %d configured DNS servers, next lookup will try %s again", #servers, servers[1]);
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44 end
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45
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46 resolver:servfail(conn); -- Let the magic commence
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47 end
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48 end
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49 do
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50 local err;
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51 handler, err = server.wrapclient(sock, "dns", 53, listener);
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52 if not handler then
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53 return nil, err;
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54 end
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55 end
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56
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57 handler.settimeout = function () end
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58 handler.setsockname = function (_, ...) return sock:setsockname(...); end
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59 handler.setpeername = function (_, ...) peername = (...); local ret, err = sock:setpeername(...); _:set_send(dummy_send); return ret, err; end
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60 handler.connect = function (_, ...) return sock:connect(...) end
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61 --handler.send = function (_, data) _:write(data); return _.sendbuffer and _.sendbuffer(); end
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62 handler.send = function (_, data)
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63 log("debug", "Sending DNS query to %s", peername);
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64 return sock:send(data);
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65 end
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66 return handler;
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67 end
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68
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69 function async_resolver_methods:lookup(handler, qname, qtype, qclass)
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70 local resolver = self._resolver;
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71 return coroutine.wrap(function (peek)
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72 if peek then
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73 log("debug", "Records for %s already cached, using those...", qname);
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74 handler(peek);
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75 return;
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76 end
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77 log("debug", "Records for %s not in cache, sending query (%s)...", qname, coroutine.running());
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78 local ok, err = resolver:query(qname, qtype, qclass);
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79 if ok then
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80 coroutine.yield(setmetatable({ resolver, qclass or "IN", qtype or "A", qname, coroutine.running()}, query_mt)); -- Wait for reply
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81 log("debug", "Reply for %s (%s)", qname, coroutine.running());
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82 end
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83 if ok then
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84 ok, err = pcall(handler, resolver:peek(qname, qtype, qclass));
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85 else
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86 log("error", "Error sending DNS query: %s", err);
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87 ok, err = pcall(handler, nil, err);
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88 end
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89 if not ok then
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90 log("error", "Error in DNS response handler: %s", err);
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91 end
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92 end)(resolver:peek(qname, qtype, qclass));
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93 end
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94
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95 function async_resolver_methods:lookup_promise(qname, qtype, qclass)
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96 return promise.new(function (resolve, reject)
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97 local function handler(answer)
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98 if not answer then
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99 return reject();
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100 end
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101 resolve(answer);
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102 end
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103 self:lookup(handler, qname, qtype, qclass);
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104 end);
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105 end
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106
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107 function query_methods:cancel(call_handler, reason) -- luacheck: ignore 212/reason
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108 log("warn", "Cancelling DNS lookup for %s", self[4]);
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109 self[1].cancel(self[2], self[3], self[4], self[5], call_handler);
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110 end
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111
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112 local function new_async_resolver()
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113 local resolver = new_resolver();
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114 resolver:socket_wrapper_set(new_async_socket);
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115 return setmetatable({ _resolver = resolver}, async_resolver_mt);
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116 end
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117
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118 return {
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119 lookup = function (...)
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120 return new_async_resolver():lookup(...);
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121 end;
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122 resolver = new_async_resolver;
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123 new_async_socket = new_async_socket;
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124 };