prosody
8fc3c06f922d
net/unbound.lua

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net/unbound.lua @ 12319:8fc3c06f922d

prosodyctl: check dns: List discovered addresses for diagnostic purposes It is very common to get the "unknown address" warning with this command, but people do not always understand it, or know how to debug it. Now we clearly show the addresses that prosodyctl discovered.
author Matthew Wild <mwild1@gmail.com>
date Wed, 02 Mar 2022 16:02:42 +0000
parent 12110:b5b799a2a10c
child 12509:a92e1de62c9e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10962
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1 -- libunbound based net.adns replacement for Prosody IM
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2 -- Copyright (C) 2013-2015 Kim Alvefur
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3 --
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4 -- This file is MIT licensed.
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5 --
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6 -- luacheck: ignore prosody
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7
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8 local setmetatable = setmetatable;
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9 local tostring = tostring;
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10 local t_concat = table.concat;
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11 local s_format = string.format;
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12 local s_lower = string.lower;
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13 local s_upper = string.upper;
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14 local noop = function() end;
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15
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16 local logger = require "util.logger";
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17 local log = logger.init("unbound");
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18 local net_server = require "net.server";
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19 local libunbound = require"lunbound";
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23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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20 local promise = require"util.promise";
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b5b799a2a10c util.id: Adjust entropy levels, with rationales
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21 local new_id = require "util.id".short;
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22
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23 local gettime = require"socket".gettime;
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24 local dns_utils = require"util.dns";
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25 local classes, types, errors = dns_utils.classes, dns_utils.types, dns_utils.errors;
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26 local parsers = dns_utils.parsers;
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27
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28 local function add_defaults(conf)
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29 if conf then
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30 for option, default in pairs(libunbound.config) do
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31 if conf[option] == nil then
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32 conf[option] = default;
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33 end
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34 end
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35 end
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36 return conf;
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37 end
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38
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39 local unbound_config;
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40 if prosody then
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41 local config = require"core.configmanager";
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42 unbound_config = add_defaults(config.get("*", "unbound"));
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43 prosody.events.add_handler("config-reloaded", function()
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44 unbound_config = add_defaults(config.get("*", "unbound"));
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45 end);
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46 end
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47 -- Note: libunbound will default to using root hints if resolvconf is unset
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48
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49 local function connect_server(unbound, server)
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50 log("debug", "Setting up net.server event handling for %s", unbound);
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51 return server.watchfd(unbound, function ()
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52 log("debug", "Processing queries for %s", unbound);
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53 unbound:process()
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54 end);
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55 end
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56
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57 local unbound, server_conn;
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58
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59 local function initialize()
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60 unbound = libunbound.new(unbound_config);
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61 server_conn = connect_server(unbound, net_server);
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62 end
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63 if prosody then
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64 prosody.events.add_handler("server-started", initialize);
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65 end
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66
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67 local answer_mt = {
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68 __tostring = function(self)
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69 if self._string then return self._string end
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70 local h = s_format("Status: %s", errors[self.status]);
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71 if self.secure then
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72 h = h .. ", Secure";
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73 elseif self.bogus then
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74 h = h .. s_format(", Bogus: %s", self.bogus);
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75 end
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76 local t = { h };
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77 for i = 1, #self do
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78 t[i+1]=self.qname.."\t"..classes[self.qclass].."\t"..types[self.qtype].."\t"..tostring(self[i]);
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79 end
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80 local _string = t_concat(t, "\n");
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81 self._string = _string;
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82 return _string;
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83 end;
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84 };
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85
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86 local waiting_queries = {};
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87
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88 local function prep_answer(a)
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89 if not a then return end
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90 local status = errors[a.rcode];
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91 local qclass = classes[a.qclass];
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92 local qtype = types[a.qtype];
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93 a.status, a.class, a.type = status, qclass, qtype;
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94
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95 local t = s_lower(qtype);
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96 local rr_mt = { __index = a, __tostring = function(self) return tostring(self[t]) end };
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97 local parser = parsers[qtype];
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98 for i = 1, #a do
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99 if a.bogus then
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100 -- Discard bogus data
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101 a[i] = nil;
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102 else
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103 a[i] = setmetatable({[t] = parser(a[i])}, rr_mt);
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104 end
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105 end
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106 return setmetatable(a, answer_mt);
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107 end
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108
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109 local function lookup(callback, qname, qtype, qclass)
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110 if not unbound then initialize(); end
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111 qtype = qtype and s_upper(qtype) or "A";
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112 qclass = qclass and s_upper(qclass) or "IN";
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113 local ntype, nclass = types[qtype], classes[qclass];
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114 local startedat = gettime();
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115 local ret;
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116 local log_query = logger.init("unbound.query"..new_id());
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117 local function callback_wrapper(a, err)
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118 local gotdataat = gettime();
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119 waiting_queries[ret] = nil;
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120 if a then
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121 prep_answer(a);
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122 log_query("debug", "Results for %s %s %s: %s (%s, %f sec)", qname, qclass, qtype, a.rcode == 0 and (#a .. " items") or a.status,
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123 a.secure and "Secure" or a.bogus or "Insecure", gotdataat - startedat); -- Insecure as in unsigned
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124 else
11250
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125 log_query("error", "Results for %s %s %s: %s", qname, qclass, qtype, tostring(err));
10962
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126 end
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127 local ok, cerr = pcall(callback, a, err);
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128 if not ok then log_query("error", "Error in callback: %s", cerr); end
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129 end
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130 log_query("debug", "Resolve %s %s %s", qname, qclass, qtype);
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131 local err;
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132 ret, err = unbound:resolve_async(callback_wrapper, qname, ntype, nclass);
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133 if ret then
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134 waiting_queries[ret] = callback;
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135 else
11250
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136 log_query("warn", "Resolver error: %s", err);
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137 end
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138 return ret, err;
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139 end
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140
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141 local function lookup_sync(qname, qtype, qclass)
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142 if not unbound then initialize(); end
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143 qtype = qtype and s_upper(qtype) or "A";
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144 qclass = qclass and s_upper(qclass) or "IN";
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145 local ntype, nclass = types[qtype], classes[qclass];
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146 local a, err = unbound:resolve(qname, ntype, nclass);
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147 if not a then return a, err; end
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148 return prep_answer(a);
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149 end
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150
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151 local function cancel(id)
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152 local cb = waiting_queries[id];
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153 unbound:cancel(id);
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154 if cb then
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155 cb(nil, "canceled");
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156 waiting_queries[id] = nil;
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157 end
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158 return true;
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159 end
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160
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161 -- Reinitiate libunbound context, drops cache
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162 local function purge()
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163 for id in pairs(waiting_queries) do cancel(id); end
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164 if server_conn then server_conn:close(); end
11252
ba335004ca60 net.unbound: Move libunbound initialization into a function
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165 initialize();
10962
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166 return true;
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167 end
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parents:
diff changeset
168
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169 local function not_implemented()
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170 error "not implemented";
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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171 end
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172 -- Public API
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173 local _M = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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174 lookup = lookup;
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175 cancel = cancel;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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176 new_async_socket = not_implemented;
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177 dns = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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178 lookup = lookup_sync;
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179 cancel = cancel;
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180 cache = noop;
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181 socket_wrapper_set = noop;
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182 settimeout = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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183 query = noop;
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184 purge = purge;
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185 random = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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186 peek = noop;
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187
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188 types = types;
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189 classes = classes;
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190 };
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191 };
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diff changeset
192
10968
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193 local function lookup_promise(_, qname, qtype, qclass)
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194 return promise.new(function (resolve, reject)
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195 local function callback(answer, err)
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diff changeset
196 if err then
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diff changeset
197 return reject(err);
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diff changeset
198 else
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diff changeset
199 return resolve(answer);
10962
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parents:
diff changeset
200 end
10968
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
201 end
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
202 local ret, err = lookup(callback, qname, qtype, qclass)
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parents: 10967
diff changeset
203 if not ret then reject(err); end
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
204 end);
10962
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
205 end
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
206
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
207 local wrapper = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
208 lookup = function (_, callback, qname, qtype, qclass)
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
209 return lookup(callback, qname, qtype, qclass)
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parents:
diff changeset
210 end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
211 lookup_promise = lookup_promise;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 _resolver = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 settimeout = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
214 closeall = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
215 };
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
216 }
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
217
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 function _M.resolver() return wrapper; end
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
219
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 return _M;