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d1b7edf4e2de
net/unbound.lua

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net/unbound.lua @ 13479:d1b7edf4e2de

net.unbound: Show canonical name in textual format (e.g. in shell) libunbound does not tell us the whole chain of CNAMEs, only the final canonical name. This is to aid in debugging since it will only be shown in the shell.
author Kim Alvefur <zash@zash.se>
date Sun, 14 Apr 2024 14:06:57 +0200
parent 12974:ba409c67353b
child 13659:5abdcad8c2e0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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23 local gettime = require"socket".gettime;
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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 = { hoststxt = false }
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29
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30 local function add_defaults(conf)
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31 conf = conf or {};
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32 for option, default in pairs(builtin_defaults) do
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33 if conf[option] == nil then
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34 conf[option] = default;
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35 end
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36 end
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37 for option, default in pairs(libunbound.config) do
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38 if conf[option] == nil then
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39 conf[option] = default;
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40 end
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41 end
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42 return conf;
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43 end
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44
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45 local unbound_config;
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46 if prosody then
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47 local config = require"prosody.core.configmanager";
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48 unbound_config = add_defaults(config.get("*", "unbound"));
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49 prosody.events.add_handler("config-reloaded", function()
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50 unbound_config = add_defaults(config.get("*", "unbound"));
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51 end);
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52 end
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53 -- Note: libunbound will default to using root hints if resolvconf is unset
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54
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55 local function connect_server(unbound, server)
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56 log("debug", "Setting up net.server event handling for %s", unbound);
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57 return server.watchfd(unbound, function ()
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58 log("debug", "Processing queries for %s", unbound);
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59 unbound:process()
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60 end);
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61 end
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62
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63 local unbound, server_conn;
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64
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65 local function initialize()
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66 unbound = libunbound.new(unbound_config);
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67 server_conn = connect_server(unbound, net_server);
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68 end
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69 if prosody then
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70 prosody.events.add_handler("server-started", initialize);
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71 end
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72
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73 local answer_mt = {
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74 __tostring = function(self)
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75 if self._string then return self._string end
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76 local h = s_format("Status: %s", errors[self.status]);
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77 if self.secure then
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78 h = h .. ", Secure";
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79 elseif self.bogus then
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80 h = h .. s_format(", Bogus: %s", self.bogus);
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81 end
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82 local t = { h };
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83 local qname = self.canonname or self.qname;
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84 if self.canonname then
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85 table.insert(t, self.qname .. "\t" .. classes[self.qclass] .. "\tCNAME\t" .. self.canonname);
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86 end
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87 for i = 1, #self do
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88 table.insert(t, qname .. "\t" .. classes[self.qclass] .. "\t" .. types[self.qtype] .. "\t" .. tostring(self[i]));
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89 end
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90 local _string = t_concat(t, "\n");
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91 self._string = _string;
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92 return _string;
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93 end;
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94 };
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95
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96 local waiting_queries = {};
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97
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98 local function prep_answer(a)
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99 if not a then return end
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100 local status = errors[a.rcode];
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101 local qclass = classes[a.qclass];
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102 local qtype = types[a.qtype];
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103 a.status, a.class, a.type = status, qclass, qtype;
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104
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105 local t = s_lower(qtype);
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106 local rr_mt = { __index = a, __tostring = function(self) return tostring(self[t]) end };
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107 local parser = parsers[qtype];
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108 for i = 1, #a do
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109 if a.bogus then
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110 -- Discard bogus data
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111 a[i] = nil;
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112 else
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113 a[i] = setmetatable({[t] = parser(a[i])}, rr_mt);
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114 end
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115 end
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116 return setmetatable(a, answer_mt);
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117 end
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118
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119 local function lookup(callback, qname, qtype, qclass)
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120 if not unbound then initialize(); end
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121 qtype = qtype and s_upper(qtype) or "A";
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122 qclass = qclass and s_upper(qclass) or "IN";
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123 local ntype, nclass = types[qtype], classes[qclass];
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124 local startedat = gettime();
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125 local ret;
11250
d1351683dfe5 net.unbound: Allow tracing individual queries with a logger per query
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126 local log_query = logger.init("unbound.query"..new_id());
10962
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127 local function callback_wrapper(a, err)
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128 local gotdataat = gettime();
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129 waiting_queries[ret] = nil;
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130 if a then
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131 prep_answer(a);
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132 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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133 a.secure and "Secure" or a.bogus or "Insecure", gotdataat - startedat); -- Insecure as in unsigned
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134 else
11250
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135 log_query("error", "Results for %s %s %s: %s", qname, qclass, qtype, tostring(err));
10962
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136 end
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137 local ok, cerr = pcall(callback, a, err);
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138 if not ok then log_query("error", "Error in callback: %s", cerr); end
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139 end
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140 log_query("debug", "Resolve %s %s %s", qname, qclass, qtype);
10962
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141 local err;
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142 ret, err = unbound:resolve_async(callback_wrapper, qname, ntype, nclass);
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143 if ret then
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144 waiting_queries[ret] = callback;
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145 else
12510
cd3b5912c9a3 net.unbound: Adjust log level of error to error to error
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146 log_query("error", "Resolver error: %s", err);
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147 end
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148 return ret, err;
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149 end
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150
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151 local function lookup_sync(qname, qtype, qclass)
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152 if not unbound then initialize(); end
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153 qtype = qtype and s_upper(qtype) or "A";
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154 qclass = qclass and s_upper(qclass) or "IN";
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155 local ntype, nclass = types[qtype], classes[qclass];
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156 local a, err = unbound:resolve(qname, ntype, nclass);
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157 if not a then return a, err; end
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158 return prep_answer(a);
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159 end
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160
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Kim Alvefur <zash@zash.se>
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161 local function cancel(id)
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162 local cb = waiting_queries[id];
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163 unbound:cancel(id);
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164 if cb then
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165 cb(nil, "canceled");
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166 waiting_queries[id] = nil;
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167 end
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168 return true;
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169 end
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170
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171 -- Reinitiate libunbound context, drops cache
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172 local function purge()
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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173 for id in pairs(waiting_queries) do cancel(id); end
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174 if server_conn then server_conn:close(); end
11252
ba335004ca60 net.unbound: Move libunbound initialization into a function
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175 initialize();
10962
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176 return true;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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177 end
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Kim Alvefur <zash@zash.se>
parents:
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178
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Kim Alvefur <zash@zash.se>
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179 local function not_implemented()
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180 error "not implemented";
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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181 end
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182 -- Public API
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183 local _M = {
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184 lookup = lookup;
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185 cancel = cancel;
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186 new_async_socket = not_implemented;
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187 dns = {
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188 lookup = lookup_sync;
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189 cancel = cancel;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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190 cache = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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191 socket_wrapper_set = noop;
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192 settimeout = noop;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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193 query = noop;
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194 purge = purge;
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diff changeset
195 random = noop;
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
196 peek = noop;
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diff changeset
197
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diff changeset
198 types = types;
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199 classes = classes;
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diff changeset
200 };
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parents:
diff changeset
201 };
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diff changeset
202
10968
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diff changeset
203 local function lookup_promise(_, qname, qtype, qclass)
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diff changeset
204 return promise.new(function (resolve, reject)
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diff changeset
205 local function callback(answer, err)
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Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
206 if err then
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
207 return reject(err);
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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diff changeset
208 else
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parents: 10967
diff changeset
209 return resolve(answer);
10962
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parents:
diff changeset
210 end
10968
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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parents: 10967
diff changeset
211 end
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
Kim Alvefur <zash@zash.se>
parents: 10967
diff changeset
212 local ret, err = lookup(callback, qname, qtype, qclass)
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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parents: 10967
diff changeset
213 if not ret then reject(err); end
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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parents: 10967
diff changeset
214 end);
10962
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
215 end
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 local wrapper = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 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
219 return lookup(callback, qname, qtype, qclass)
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parents:
diff changeset
220 end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
221 lookup_promise = lookup_promise;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
222 _resolver = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
223 settimeout = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
224 closeall = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
225 };
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
226 }
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
227
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
228 function _M.resolver() return wrapper; end
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
229
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
230 return _M;