prosody
06453c564141
net/unbound.lua

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net/unbound.lua @ 13014:06453c564141

util.startup: Add prosody.started promise to easily execute code after startup To avoid a race where server-started fires before the promise function body is run (on next tick), I moved server-started to fire on the next tick, which seems sensible anyway. Errors are logged, I'm not sure if we ought to be doing something more here. I'm sure we'll find out.
author Matthew Wild <mwild1@gmail.com>
date Sat, 01 Apr 2023 11:56:38 +0100
parent 12974:ba409c67353b
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 for i = 1, #self do
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84 t[i+1]=self.qname.."\t"..classes[self.qclass].."\t"..types[self.qtype].."\t"..tostring(self[i]);
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85 end
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86 local _string = t_concat(t, "\n");
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87 self._string = _string;
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88 return _string;
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89 end;
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90 };
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91
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92 local waiting_queries = {};
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93
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94 local function prep_answer(a)
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95 if not a then return end
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96 local status = errors[a.rcode];
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97 local qclass = classes[a.qclass];
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98 local qtype = types[a.qtype];
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99 a.status, a.class, a.type = status, qclass, qtype;
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100
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101 local t = s_lower(qtype);
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102 local rr_mt = { __index = a, __tostring = function(self) return tostring(self[t]) end };
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103 local parser = parsers[qtype];
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104 for i = 1, #a do
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105 if a.bogus then
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106 -- Discard bogus data
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107 a[i] = nil;
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108 else
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109 a[i] = setmetatable({[t] = parser(a[i])}, rr_mt);
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110 end
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111 end
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112 return setmetatable(a, answer_mt);
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113 end
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114
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115 local function lookup(callback, qname, qtype, qclass)
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116 if not unbound then initialize(); end
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117 qtype = qtype and s_upper(qtype) or "A";
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118 qclass = qclass and s_upper(qclass) or "IN";
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119 local ntype, nclass = types[qtype], classes[qclass];
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120 local startedat = gettime();
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121 local ret;
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122 local log_query = logger.init("unbound.query"..new_id());
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123 local function callback_wrapper(a, err)
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124 local gotdataat = gettime();
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125 waiting_queries[ret] = nil;
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126 if a then
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127 prep_answer(a);
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128 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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129 a.secure and "Secure" or a.bogus or "Insecure", gotdataat - startedat); -- Insecure as in unsigned
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130 else
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131 log_query("error", "Results for %s %s %s: %s", qname, qclass, qtype, tostring(err));
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132 end
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133 local ok, cerr = pcall(callback, a, err);
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134 if not ok then log_query("error", "Error in callback: %s", cerr); end
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135 end
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136 log_query("debug", "Resolve %s %s %s", qname, qclass, qtype);
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137 local err;
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138 ret, err = unbound:resolve_async(callback_wrapper, qname, ntype, nclass);
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139 if ret then
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140 waiting_queries[ret] = callback;
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141 else
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142 log_query("error", "Resolver error: %s", err);
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143 end
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144 return ret, err;
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145 end
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146
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147 local function lookup_sync(qname, qtype, qclass)
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148 if not unbound then initialize(); end
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149 qtype = qtype and s_upper(qtype) or "A";
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150 qclass = qclass and s_upper(qclass) or "IN";
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151 local ntype, nclass = types[qtype], classes[qclass];
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152 local a, err = unbound:resolve(qname, ntype, nclass);
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153 if not a then return a, err; end
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154 return prep_answer(a);
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155 end
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156
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157 local function cancel(id)
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158 local cb = waiting_queries[id];
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159 unbound:cancel(id);
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160 if cb then
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161 cb(nil, "canceled");
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162 waiting_queries[id] = nil;
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163 end
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164 return true;
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165 end
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166
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167 -- Reinitiate libunbound context, drops cache
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168 local function purge()
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169 for id in pairs(waiting_queries) do cancel(id); end
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170 if server_conn then server_conn:close(); end
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ba335004ca60 net.unbound: Move libunbound initialization into a function
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171 initialize();
10962
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172 return true;
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173 end
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174
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175 local function not_implemented()
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176 error "not implemented";
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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177 end
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178 -- Public API
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179 local _M = {
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180 lookup = lookup;
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181 cancel = cancel;
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182 new_async_socket = not_implemented;
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183 dns = {
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184 lookup = lookup_sync;
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185 cancel = cancel;
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186 cache = noop;
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187 socket_wrapper_set = noop;
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188 settimeout = noop;
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189 query = noop;
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190 purge = purge;
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191 random = noop;
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192 peek = noop;
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193
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194 types = types;
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195 classes = classes;
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196 };
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197 };
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198
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199 local function lookup_promise(_, qname, qtype, qclass)
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200 return promise.new(function (resolve, reject)
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201 local function callback(answer, err)
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diff changeset
202 if err then
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diff changeset
203 return reject(err);
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diff changeset
204 else
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diff changeset
205 return resolve(answer);
10962
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parents:
diff changeset
206 end
10968
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diff changeset
207 end
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diff changeset
208 local ret, err = lookup(callback, qname, qtype, qclass)
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diff changeset
209 if not ret then reject(err); end
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diff changeset
210 end);
10962
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
211 end
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 local wrapper = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
214 lookup = function (_, callback, qname, qtype, qclass)
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
215 return lookup(callback, qname, qtype, qclass)
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parents:
diff changeset
216 end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
217 lookup_promise = lookup_promise;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
218 _resolver = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
219 settimeout = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 closeall = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
221 };
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
222 }
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
223
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
224 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
225
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
226 return _M;