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annotate net/unbound.lua @ 14229:ce31fdde0ad1 default tip

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net.unbound: Simplify conditional
author Kim Alvefur <zash@zash.se>
date Sat, 13 Jun 2026 11:35:18 +0200
parents 36aac3343563
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10962
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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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 "prosody.util.logger";
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17 local log = logger.init("unbound");
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18 local net_server = require "prosody.net.server";
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19 local libunbound = require"lunbound";
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20 local promise = require"prosody.util.promise";
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21 local new_id = require "prosody.util.id".short;
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22 local timer = require "prosody.util.timer";
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23
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24 local dns_utils = require"prosody.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 builtin_defaults = {
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29 -- Continue net.dns tradition of not reading /etc/hosts which does not fit well with SRV records anyway
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30 hoststxt = false;
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31 -- net.dns did read /etc/resolv.conf and we want libunbound to instead of operating in recursive mode
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32 resolvconf = true;
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33 }
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34
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35 -- Path to file containing current DNSSEC trust anchors, needed to enable DNSSEC.
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36 -- Packagers: Adjust this path if it is different on your distribution
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37 local trustfile = "/usr/share/dns/root.ds";
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38
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39 local function add_defaults(conf, use_dnssec)
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40 conf = conf or {};
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41 for option, default in pairs(builtin_defaults) do
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42 if conf[option] == nil then
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43 conf[option] = default;
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44 end
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45 end
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37612a03220d net.unbound: Inherit trust anchors from luaunbound defaults
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46 for option, default in pairs(libunbound.config) do
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47 if conf[option] == nil then
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48 conf[option] = default;
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49 end
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50 end
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36aac3343563 net.unbound: Respect use_dnssec=false in case of default TA in lua-event
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51 if use_dnssec == false then
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52 conf["trustfile"] = nil;
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53 conf["trusted"] = nil;
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ce31fdde0ad1 net.unbound: Simplify conditional
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54 elseif conf["trustfile"] == nil and conf["trusted"] == nil then
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55 conf["trustfile"] = trustfile;
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56 end
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57 return conf;
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58 end
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59
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60 local unbound_config;
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61
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62 local function connect_server(unbound, server)
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63 log("debug", "Setting up net.server event handling for %s", unbound);
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64 return server.watchfd(unbound, function ()
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65 log("debug", "Processing queries for %s", unbound);
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66 unbound:process()
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67 end);
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68 end
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69
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70 local unbound, server_conn;
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71
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72 local function initialize()
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73 unbound = libunbound.new(unbound_config);
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74 server_conn = connect_server(unbound, net_server);
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75 end
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76
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77 local answer_mt = {
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78 __tostring = function(self)
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79 if self._string then return self._string end
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80 local h = s_format("Status: %s", errors[self.status]);
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81 if self.secure then
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82 h = h .. ", Secure";
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83 elseif self.bogus then
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84 h = h .. s_format(", Bogus: %s", self.bogus);
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85 end
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86 local t = { h };
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87 local qname = self.canonname or self.qname;
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88 if self.canonname then
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89 table.insert(t, self.qname .. "\t" .. classes[self.qclass] .. "\tCNAME\t" .. self.canonname);
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90 end
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91 for i = 1, #self do
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92 table.insert(t, qname .. "\t" .. classes[self.qclass] .. "\t" .. types[self.qtype] .. "\t" .. tostring(self[i]));
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93 end
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94 local _string = t_concat(t, "\n");
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95 self._string = _string;
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96 return _string;
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97 end;
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98 };
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99
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100 local function prep_answer(a)
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101 if not a then return end
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102 local status = errors[a.rcode];
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103 local qclass = classes[a.qclass];
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104 local qtype = types[a.qtype];
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105 a.status, a.class, a.type = status, qclass, qtype;
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106
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107 local t = s_lower(qtype);
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108 local rr_mt = { __index = a, __tostring = function(self) return tostring(self[t]) end };
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109 local parser = parsers[qtype];
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110 for i = 1, #a do
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111 if a.bogus then
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112 -- Discard bogus data
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113 a[i] = nil;
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114 else
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115 a[i] = setmetatable({[t] = parser(a[i])}, rr_mt);
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116 end
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117 end
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118 return setmetatable(a, answer_mt);
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119 end
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120
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121 local function measure(_qclass, _qtype)
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122 return measure;
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123 end
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124
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125 local count = measure;
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126
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127 local function lookup(callback, qname, qtype, qclass)
11253
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128 if not unbound then initialize(); end
10962
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129 qtype = qtype and s_upper(qtype) or "A";
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130 qclass = qclass and s_upper(qclass) or "IN";
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131 local ntype, nclass = types[qtype], classes[qclass];
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132
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133 local m;
11250
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134 local log_query = logger.init("unbound.query"..new_id());
10962
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135 local function callback_wrapper(a, err)
13659
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136 m();
10962
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137 if a then
13981
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138 count(qclass, qtype, #a);
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139 prep_answer(a);
13659
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140 log_query("debug", "Results for %s %s %s: %s (%s)", qname, qclass, qtype, a.rcode == 0 and (#a .. " items") or a.status,
5abdcad8c2e0 net.adns: Collect DNS lookup timing metrics
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141 a.secure and "Secure" or a.bogus or "Insecure"); -- Insecure as in unsigned
10962
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142 else
11250
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143 log_query("error", "Results for %s %s %s: %s", qname, qclass, qtype, tostring(err));
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144 end
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145 local ok, cerr = pcall(callback, a, err);
11250
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146 if not ok then log_query("error", "Error in callback: %s", cerr); end
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147 end
11250
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148 log_query("debug", "Resolve %s %s %s", qname, qclass, qtype);
13659
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149 m = measure(qclass, qtype);
14209
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150 local ret, err = unbound:resolve_async(callback_wrapper, qname, ntype, nclass);
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151 if not ret then
12510
cd3b5912c9a3 net.unbound: Adjust log level of error to error to error
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152 log_query("error", "Resolver error: %s", err);
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153 end
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154 return ret, err;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
155 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
156
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
157 local function lookup_sync(qname, qtype, qclass)
11302
6bb2986783d0 net.unbound: Fix to initialize under prosodyctl
Kim Alvefur <zash@zash.se>
parents: 11253
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158 if not unbound then initialize(); end
10962
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diff changeset
159 qtype = qtype and s_upper(qtype) or "A";
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parents:
diff changeset
160 qclass = qclass and s_upper(qclass) or "IN";
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parents:
diff changeset
161 local ntype, nclass = types[qtype], classes[qclass];
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
162 local a, err = unbound:resolve(qname, ntype, nclass);
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parents:
diff changeset
163 if not a then return a, err; end
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Kim Alvefur <zash@zash.se>
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diff changeset
164 return prep_answer(a);
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parents:
diff changeset
165 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
166
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diff changeset
167 -- Reinitiate libunbound context, drops cache
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parents:
diff changeset
168 local function purge()
14208
9c062f243d3a net.unbound: Let in-flight queries complete after re-initialization
Kim Alvefur <zash@zash.se>
parents: 14207
diff changeset
169 if server_conn then
9c062f243d3a net.unbound: Let in-flight queries complete after re-initialization
Kim Alvefur <zash@zash.se>
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diff changeset
170 local old_unbound, old_server_conn = unbound, server_conn;
9c062f243d3a net.unbound: Let in-flight queries complete after re-initialization
Kim Alvefur <zash@zash.se>
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diff changeset
171 timer.add_task(30, function()
9c062f243d3a net.unbound: Let in-flight queries complete after re-initialization
Kim Alvefur <zash@zash.se>
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diff changeset
172 old_server_conn:close();
14209
c4aa9b2b4787 net.unbound: Simplify by removing cancel()
Kim Alvefur <zash@zash.se>
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diff changeset
173 if old_unbound.cancelall then
c4aa9b2b4787 net.unbound: Simplify by removing cancel()
Kim Alvefur <zash@zash.se>
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diff changeset
174 old_unbound:cancelall();
c4aa9b2b4787 net.unbound: Simplify by removing cancel()
Kim Alvefur <zash@zash.se>
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diff changeset
175 end
14208
9c062f243d3a net.unbound: Let in-flight queries complete after re-initialization
Kim Alvefur <zash@zash.se>
parents: 14207
diff changeset
176 end)
9c062f243d3a net.unbound: Let in-flight queries complete after re-initialization
Kim Alvefur <zash@zash.se>
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diff changeset
177 end
11252
ba335004ca60 net.unbound: Move libunbound initialization into a function
Kim Alvefur <zash@zash.se>
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diff changeset
178 initialize();
10962
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179 return true;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
180 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
181
14207
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Kim Alvefur <zash@zash.se>
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diff changeset
182 if prosody then
14216
2ec517d8d43e net.unbound: Enable DNSSEC by default with option for turning off
Kim Alvefur <zash@zash.se>
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diff changeset
183 -- TODO move this glue logic into util.startup?
2ec517d8d43e net.unbound: Enable DNSSEC by default with option for turning off
Kim Alvefur <zash@zash.se>
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diff changeset
184 local config = require "prosody.core.configmanager";
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185 unbound_config = add_defaults(config.get("*", "unbound"), config.get("*", "use_dnssec"));
14207
23f1c71b3d56 net.unbound: Reset and apply new config on reload
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diff changeset
186 prosody.events.add_handler("config-reloaded", function()
14216
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diff changeset
187 unbound_config = add_defaults(config.get("*", "unbound"), config.get("*", "use_dnssec"));
14207
23f1c71b3d56 net.unbound: Reset and apply new config on reload
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diff changeset
188 purge();
23f1c71b3d56 net.unbound: Reset and apply new config on reload
Kim Alvefur <zash@zash.se>
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diff changeset
189 end);
23f1c71b3d56 net.unbound: Reset and apply new config on reload
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diff changeset
190 prosody.events.add_handler("server-started", initialize);
23f1c71b3d56 net.unbound: Reset and apply new config on reload
Kim Alvefur <zash@zash.se>
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diff changeset
191 end
23f1c71b3d56 net.unbound: Reset and apply new config on reload
Kim Alvefur <zash@zash.se>
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diff changeset
192
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193 local function not_implemented()
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Kim Alvefur <zash@zash.se>
parents:
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194 error "not implemented";
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
195 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
196 -- Public API
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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diff changeset
197 local _M = {
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198 lookup = lookup;
14209
c4aa9b2b4787 net.unbound: Simplify by removing cancel()
Kim Alvefur <zash@zash.se>
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diff changeset
199 cancel = not_implemented;
10962
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diff changeset
200 new_async_socket = not_implemented;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
201 dns = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
202 lookup = lookup_sync;
14209
c4aa9b2b4787 net.unbound: Simplify by removing cancel()
Kim Alvefur <zash@zash.se>
parents: 14208
diff changeset
203 cancel = not_implemented;
10962
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parents:
diff changeset
204 cache = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
205 socket_wrapper_set = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
206 settimeout = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
207 query = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
208 purge = purge;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
209 random = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
210 peek = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
211
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 types = types;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 classes = classes;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
214 };
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
10968
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
217 local function lookup_promise(_, qname, qtype, qclass)
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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parents: 10967
diff changeset
218 return promise.new(function (resolve, reject)
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
219 local function callback(answer, err)
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
220 if err then
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
221 return reject(err);
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
222 else
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
223 return resolve(answer);
10962
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parents:
diff changeset
224 end
10968
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
225 end
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
226 local ret, err = lookup(callback, qname, qtype, qclass)
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
227 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
228 end);
10962
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
229 end
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
230
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
231 local wrapper = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
232 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
233 return lookup(callback, qname, qtype, qclass)
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
234 end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
235 lookup_promise = lookup_promise;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
236 _resolver = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
237 settimeout = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
238 closeall = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
239 };
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
240 }
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
241
13981
350e16e5f9aa net.unbound: Count number of DNS response records
Kim Alvefur <zash@zash.se>
parents: 13659
diff changeset
242 _M.instrument = function(measure_, count_) measure, count = measure_, count_; end;
13659
5abdcad8c2e0 net.adns: Collect DNS lookup timing metrics
Kim Alvefur <zash@zash.se>
parents: 13479
diff changeset
243
10962
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
244 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
245
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
246 return _M;