prosody
93c68c454cb8
net/unbound.lua

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net/unbound.lua @ 13093:93c68c454cb8

mod_c2s,mod_s2s: Fix tag name for SLA (thanks mjk) The (still not published) XEP-xxxx: Stream Limits Advertisement uses the element <max-bytes/> to advertise the maximum octet size of top level stream elements. "size" was probably a leftover of an even earlier version of the (Proto)XEP.
author Kim Alvefur <zash@zash.se>
date Wed, 03 May 2023 18:02:11 +0200
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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cd3b5912c9a3 net.unbound: Adjust log level of error to error to error
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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
11252
ba335004ca60 net.unbound: Move libunbound initialization into a function
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171 initialize();
10962
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172 return true;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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173 end
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parents:
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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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diff changeset
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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diff changeset
201 local function callback(answer, err)
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diff changeset
202 if err then
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Kim Alvefur <zash@zash.se>
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diff changeset
203 return reject(err);
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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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
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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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
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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;