prosody
3b7e97e0a8ef
net/unbound.lua

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net/unbound.lua @ 12551:3b7e97e0a8ef

mod_admin_shell: Show session id ping reply came To point out which one when more than one connection was established, or if it's an existing connection, allows correlation with s2s:show() or with logs.
author Kim Alvefur <zash@zash.se>
date Mon, 13 Jun 2022 21:25:42 +0200
parent 12510:cd3b5912c9a3
child 12557:ee5b061588ea
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10962
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1 -- libunbound based net.adns replacement for Prosody IM
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2 -- Copyright (C) 2013-2015 Kim Alvefur
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3 --
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4 -- This file is MIT licensed.
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5 --
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6 -- luacheck: ignore prosody
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7
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8 local setmetatable = setmetatable;
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9 local tostring = tostring;
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10 local t_concat = table.concat;
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11 local s_format = string.format;
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12 local s_lower = string.lower;
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13 local s_upper = string.upper;
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14 local noop = function() end;
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15
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16 local logger = require "util.logger";
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17 local log = logger.init("unbound");
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18 local net_server = require "net.server";
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19 local libunbound = require"lunbound";
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20 local promise = require"util.promise";
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21 local new_id = require "util.id".short;
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22
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23 local gettime = require"socket".gettime;
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24 local dns_utils = require"util.dns";
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25 local classes, types, errors = dns_utils.classes, dns_utils.types, dns_utils.errors;
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26 local parsers = dns_utils.parsers;
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27
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28 local builtin_defaults = { hoststxt = false }
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29
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30 local function add_defaults(conf)
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31 if conf then
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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 else
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43 return builtin_defaults;
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44 end
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45 return conf;
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46 end
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47
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48 local unbound_config;
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49 if prosody then
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50 local config = require"core.configmanager";
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51 unbound_config = add_defaults(config.get("*", "unbound"));
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52 prosody.events.add_handler("config-reloaded", function()
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53 unbound_config = add_defaults(config.get("*", "unbound"));
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54 end);
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55 end
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56 -- Note: libunbound will default to using root hints if resolvconf is unset
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57
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58 local function connect_server(unbound, server)
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59 log("debug", "Setting up net.server event handling for %s", unbound);
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60 return server.watchfd(unbound, function ()
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61 log("debug", "Processing queries for %s", unbound);
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62 unbound:process()
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63 end);
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64 end
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65
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66 local unbound, server_conn;
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67
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68 local function initialize()
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69 unbound = libunbound.new(unbound_config);
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70 server_conn = connect_server(unbound, net_server);
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71 end
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72 if prosody then
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73 prosody.events.add_handler("server-started", initialize);
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74 end
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75
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76 local answer_mt = {
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77 __tostring = function(self)
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78 if self._string then return self._string end
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79 local h = s_format("Status: %s", errors[self.status]);
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80 if self.secure then
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81 h = h .. ", Secure";
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82 elseif self.bogus then
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83 h = h .. s_format(", Bogus: %s", self.bogus);
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84 end
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85 local t = { h };
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86 for i = 1, #self do
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87 t[i+1]=self.qname.."\t"..classes[self.qclass].."\t"..types[self.qtype].."\t"..tostring(self[i]);
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88 end
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89 local _string = t_concat(t, "\n");
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90 self._string = _string;
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91 return _string;
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92 end;
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93 };
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94
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95 local waiting_queries = {};
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96
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97 local function prep_answer(a)
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98 if not a then return end
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99 local status = errors[a.rcode];
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100 local qclass = classes[a.qclass];
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101 local qtype = types[a.qtype];
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102 a.status, a.class, a.type = status, qclass, qtype;
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103
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104 local t = s_lower(qtype);
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105 local rr_mt = { __index = a, __tostring = function(self) return tostring(self[t]) end };
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106 local parser = parsers[qtype];
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107 for i = 1, #a do
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108 if a.bogus then
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109 -- Discard bogus data
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110 a[i] = nil;
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111 else
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112 a[i] = setmetatable({[t] = parser(a[i])}, rr_mt);
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113 end
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114 end
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115 return setmetatable(a, answer_mt);
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116 end
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117
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118 local function lookup(callback, qname, qtype, qclass)
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119 if not unbound then initialize(); end
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120 qtype = qtype and s_upper(qtype) or "A";
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121 qclass = qclass and s_upper(qclass) or "IN";
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122 local ntype, nclass = types[qtype], classes[qclass];
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123 local startedat = gettime();
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124 local ret;
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125 local log_query = logger.init("unbound.query"..new_id());
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126 local function callback_wrapper(a, err)
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127 local gotdataat = gettime();
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128 waiting_queries[ret] = nil;
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129 if a then
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130 prep_answer(a);
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131 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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132 a.secure and "Secure" or a.bogus or "Insecure", gotdataat - startedat); -- Insecure as in unsigned
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133 else
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134 log_query("error", "Results for %s %s %s: %s", qname, qclass, qtype, tostring(err));
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135 end
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136 local ok, cerr = pcall(callback, a, err);
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137 if not ok then log_query("error", "Error in callback: %s", cerr); end
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138 end
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139 log_query("debug", "Resolve %s %s %s", qname, qclass, qtype);
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140 local err;
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141 ret, err = unbound:resolve_async(callback_wrapper, qname, ntype, nclass);
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142 if ret then
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143 waiting_queries[ret] = callback;
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144 else
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145 log_query("error", "Resolver error: %s", err);
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146 end
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147 return ret, err;
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148 end
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149
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150 local function lookup_sync(qname, qtype, qclass)
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151 if not unbound then initialize(); end
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152 qtype = qtype and s_upper(qtype) or "A";
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153 qclass = qclass and s_upper(qclass) or "IN";
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154 local ntype, nclass = types[qtype], classes[qclass];
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155 local a, err = unbound:resolve(qname, ntype, nclass);
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156 if not a then return a, err; end
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157 return prep_answer(a);
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158 end
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159
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160 local function cancel(id)
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161 local cb = waiting_queries[id];
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162 unbound:cancel(id);
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163 if cb then
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164 cb(nil, "canceled");
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165 waiting_queries[id] = nil;
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166 end
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167 return true;
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168 end
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169
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170 -- Reinitiate libunbound context, drops cache
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171 local function purge()
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172 for id in pairs(waiting_queries) do cancel(id); end
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173 if server_conn then server_conn:close(); end
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174 initialize();
10962
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175 return true;
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176 end
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177
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178 local function not_implemented()
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179 error "not implemented";
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180 end
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181 -- Public API
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182 local _M = {
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183 lookup = lookup;
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184 cancel = cancel;
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185 new_async_socket = not_implemented;
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186 dns = {
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187 lookup = lookup_sync;
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188 cancel = cancel;
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189 cache = noop;
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190 socket_wrapper_set = noop;
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191 settimeout = noop;
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192 query = noop;
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193 purge = purge;
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194 random = noop;
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195 peek = noop;
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196
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197 types = types;
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198 classes = classes;
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199 };
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200 };
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diff changeset
201
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202 local function lookup_promise(_, qname, qtype, qclass)
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203 return promise.new(function (resolve, reject)
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204 local function callback(answer, err)
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diff changeset
205 if err then
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diff changeset
206 return reject(err);
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diff changeset
207 else
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208 return resolve(answer);
10962
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parents:
diff changeset
209 end
10968
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diff changeset
210 end
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diff changeset
211 local ret, err = lookup(callback, qname, qtype, qclass)
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diff changeset
212 if not ret then reject(err); end
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diff changeset
213 end);
10962
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parents:
diff changeset
214 end
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parents:
diff changeset
215
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parents:
diff changeset
216 local wrapper = {
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diff changeset
217 lookup = function (_, callback, qname, qtype, qclass)
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parents:
diff changeset
218 return lookup(callback, qname, qtype, qclass)
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parents:
diff changeset
219 end;
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diff changeset
220 lookup_promise = lookup_promise;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
221 _resolver = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
222 settimeout = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
223 closeall = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
224 };
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
225 }
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parents:
diff changeset
226
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diff changeset
227 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
228
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
229 return _M;