prosody
520ce76440ad
net/unbound.lua

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net/unbound.lua @ 11972:520ce76440ad

net.server_epoll: Prevent loop attempting to send last data after close If the connection is closed by the peer, any buffered data is given a last chance to be sent (see f27b9319e0da). If the connection is Really closed, no attempt to write will occur, instead epoll will raise the error flag and :onreadable() will be invoked again, where it will try to :close() again for the same reason, thus looping until the connection somehow gets destroyed. By clearing the _connected flag, the second time it passes :onreadable() it should go directly to :destroy(), breaking the loop. Thanks Link Mauve for reporting
author Kim Alvefur <zash@zash.se>
date Tue, 30 Nov 2021 18:19:40 +0100
parent 11302:6bb2986783d0
child 12110:b5b799a2a10c
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 "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".medium;
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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 function add_defaults(conf)
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29 if conf then
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30 for option, default in pairs(libunbound.config) do
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31 if conf[option] == nil then
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32 conf[option] = default;
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33 end
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34 end
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35 end
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36 return conf;
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37 end
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38
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39 local unbound_config;
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40 if prosody then
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41 local config = require"core.configmanager";
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42 unbound_config = add_defaults(config.get("*", "unbound"));
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43 prosody.events.add_handler("config-reloaded", function()
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44 unbound_config = add_defaults(config.get("*", "unbound"));
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45 end);
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46 end
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47 -- Note: libunbound will default to using root hints if resolvconf is unset
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48
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49 local function connect_server(unbound, server)
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50 log("debug", "Setting up net.server event handling for %s", unbound);
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51 return server.watchfd(unbound, function ()
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52 log("debug", "Processing queries for %s", unbound);
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53 unbound:process()
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54 end);
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55 end
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56
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57 local unbound, server_conn;
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58
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59 local function initialize()
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60 unbound = libunbound.new(unbound_config);
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61 server_conn = connect_server(unbound, net_server);
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62 end
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63 if prosody then
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64 prosody.events.add_handler("server-started", initialize);
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65 end
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66
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67 local answer_mt = {
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68 __tostring = function(self)
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69 if self._string then return self._string end
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70 local h = s_format("Status: %s", errors[self.status]);
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71 if self.secure then
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72 h = h .. ", Secure";
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73 elseif self.bogus then
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74 h = h .. s_format(", Bogus: %s", self.bogus);
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75 end
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76 local t = { h };
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77 for i = 1, #self do
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78 t[i+1]=self.qname.."\t"..classes[self.qclass].."\t"..types[self.qtype].."\t"..tostring(self[i]);
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79 end
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80 local _string = t_concat(t, "\n");
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81 self._string = _string;
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82 return _string;
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83 end;
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84 };
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85
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86 local waiting_queries = {};
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87
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88 local function prep_answer(a)
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89 if not a then return end
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90 local status = errors[a.rcode];
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91 local qclass = classes[a.qclass];
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92 local qtype = types[a.qtype];
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93 a.status, a.class, a.type = status, qclass, qtype;
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94
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95 local t = s_lower(qtype);
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96 local rr_mt = { __index = a, __tostring = function(self) return tostring(self[t]) end };
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97 local parser = parsers[qtype];
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98 for i = 1, #a do
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99 if a.bogus then
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100 -- Discard bogus data
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101 a[i] = nil;
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102 else
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103 a[i] = setmetatable({[t] = parser(a[i])}, rr_mt);
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104 end
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105 end
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106 return setmetatable(a, answer_mt);
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107 end
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108
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109 local function lookup(callback, qname, qtype, qclass)
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110 if not unbound then initialize(); end
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111 qtype = qtype and s_upper(qtype) or "A";
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112 qclass = qclass and s_upper(qclass) or "IN";
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113 local ntype, nclass = types[qtype], classes[qclass];
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114 local startedat = gettime();
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115 local ret;
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116 local log_query = logger.init("unbound.query"..new_id());
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117 local function callback_wrapper(a, err)
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118 local gotdataat = gettime();
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119 waiting_queries[ret] = nil;
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120 if a then
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121 prep_answer(a);
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122 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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123 a.secure and "Secure" or a.bogus or "Insecure", gotdataat - startedat); -- Insecure as in unsigned
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124 else
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125 log_query("error", "Results for %s %s %s: %s", qname, qclass, qtype, tostring(err));
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126 end
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127 local ok, cerr = pcall(callback, a, err);
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128 if not ok then log_query("error", "Error in callback: %s", cerr); end
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129 end
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130 log_query("debug", "Resolve %s %s %s", qname, qclass, qtype);
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131 local err;
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132 ret, err = unbound:resolve_async(callback_wrapper, qname, ntype, nclass);
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133 if ret then
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134 waiting_queries[ret] = callback;
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135 else
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136 log_query("warn", "Resolver error: %s", err);
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137 end
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138 return ret, err;
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139 end
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140
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141 local function lookup_sync(qname, qtype, qclass)
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142 if not unbound then initialize(); end
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143 qtype = qtype and s_upper(qtype) or "A";
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144 qclass = qclass and s_upper(qclass) or "IN";
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145 local ntype, nclass = types[qtype], classes[qclass];
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146 local a, err = unbound:resolve(qname, ntype, nclass);
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147 if not a then return a, err; end
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148 return prep_answer(a);
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149 end
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150
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151 local function cancel(id)
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152 local cb = waiting_queries[id];
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153 unbound:cancel(id);
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154 if cb then
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155 cb(nil, "canceled");
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156 waiting_queries[id] = nil;
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157 end
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158 return true;
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159 end
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160
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161 -- Reinitiate libunbound context, drops cache
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162 local function purge()
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163 for id in pairs(waiting_queries) do cancel(id); end
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164 if server_conn then server_conn:close(); end
11252
ba335004ca60 net.unbound: Move libunbound initialization into a function
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165 initialize();
10962
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166 return true;
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167 end
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168
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169 local function not_implemented()
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170 error "not implemented";
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171 end
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172 -- Public API
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173 local _M = {
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174 lookup = lookup;
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175 cancel = cancel;
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176 new_async_socket = not_implemented;
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177 dns = {
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178 lookup = lookup_sync;
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179 cancel = cancel;
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180 cache = noop;
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181 socket_wrapper_set = noop;
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182 settimeout = noop;
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183 query = noop;
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184 purge = purge;
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185 random = noop;
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parents:
diff changeset
186 peek = noop;
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187
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188 types = types;
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189 classes = classes;
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190 };
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191 };
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192
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193 local function lookup_promise(_, qname, qtype, qclass)
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194 return promise.new(function (resolve, reject)
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195 local function callback(answer, err)
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diff changeset
196 if err then
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diff changeset
197 return reject(err);
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198 else
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199 return resolve(answer);
10962
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parents:
diff changeset
200 end
10968
23ae55cbbeaf net.unbound: Remove compat for missing promises (pre-0.11)
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diff changeset
201 end
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diff changeset
202 local ret, err = lookup(callback, qname, qtype, qclass)
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diff changeset
203 if not ret then reject(err); end
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diff changeset
204 end);
10962
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
205 end
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
206
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
207 local wrapper = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
208 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
209 return lookup(callback, qname, qtype, qclass)
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parents:
diff changeset
210 end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
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parents:
diff changeset
211 lookup_promise = lookup_promise;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 _resolver = {
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 settimeout = function () end;
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
214 closeall = function () end;
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 }
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
217
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 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
219
92f30e8ecdfc net.unbound: Async DNS resolver library based on libunbound via luaunbound
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 return _M;