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-- libunbound based net.adns replacement for Prosody IM
-- Copyright (C) 2013-2015 Kim Alvefur
--
-- This file is MIT licensed.
--
-- luacheck: ignore prosody
local setmetatable = setmetatable;
local tostring = tostring;
local t_concat = table.concat;
local s_format = string.format;
local s_lower = string.lower;
local s_upper = string.upper;
local noop = function() end;
local logger = require "prosody.util.logger";
local log = logger.init("unbound");
local net_server = require "prosody.net.server";
local libunbound = require"lunbound";
local promise = require"prosody.util.promise";
local new_id = require "prosody.util.id".short;
local gettime = require"socket".gettime;
local dns_utils = require"prosody.util.dns";
local classes, types, errors = dns_utils.classes, dns_utils.types, dns_utils.errors;
local parsers = dns_utils.parsers;
local builtin_defaults = { hoststxt = false }
local function add_defaults(conf)
conf = conf or {};
for option, default in pairs(builtin_defaults) do
if conf[option] == nil then
conf[option] = default;
end
end
for option, default in pairs(libunbound.config) do
if conf[option] == nil then
conf[option] = default;
end
end
return conf;
end
local unbound_config;
if prosody then
local config = require"prosody.core.configmanager";
unbound_config = add_defaults(config.get("*", "unbound"));
prosody.events.add_handler("config-reloaded", function()
unbound_config = add_defaults(config.get("*", "unbound"));
end);
end
-- Note: libunbound will default to using root hints if resolvconf is unset
local function connect_server(unbound, server)
log("debug", "Setting up net.server event handling for %s", unbound);
return server.watchfd(unbound, function ()
log("debug", "Processing queries for %s", unbound);
unbound:process()
end);
end
local unbound, server_conn;
local function initialize()
unbound = libunbound.new(unbound_config);
server_conn = connect_server(unbound, net_server);
end
if prosody then
prosody.events.add_handler("server-started", initialize);
end
local answer_mt = {
__tostring = function(self)
if self._string then return self._string end
local h = s_format("Status: %s", errors[self.status]);
if self.secure then
h = h .. ", Secure";
elseif self.bogus then
h = h .. s_format(", Bogus: %s", self.bogus);
end
local t = { h };
local qname = self.canonname or self.qname;
if self.canonname then
table.insert(t, self.qname .. "\t" .. classes[self.qclass] .. "\tCNAME\t" .. self.canonname);
end
for i = 1, #self do
table.insert(t, qname .. "\t" .. classes[self.qclass] .. "\t" .. types[self.qtype] .. "\t" .. tostring(self[i]));
end
local _string = t_concat(t, "\n");
self._string = _string;
return _string;
end;
};
local waiting_queries = {};
local function prep_answer(a)
if not a then return end
local status = errors[a.rcode];
local qclass = classes[a.qclass];
local qtype = types[a.qtype];
a.status, a.class, a.type = status, qclass, qtype;
local t = s_lower(qtype);
local rr_mt = { __index = a, __tostring = function(self) return tostring(self[t]) end };
local parser = parsers[qtype];
for i = 1, #a do
if a.bogus then
-- Discard bogus data
a[i] = nil;
else
a[i] = setmetatable({[t] = parser(a[i])}, rr_mt);
end
end
return setmetatable(a, answer_mt);
end
local function lookup(callback, qname, qtype, qclass)
if not unbound then initialize(); end
qtype = qtype and s_upper(qtype) or "A";
qclass = qclass and s_upper(qclass) or "IN";
local ntype, nclass = types[qtype], classes[qclass];
local startedat = gettime();
local ret;
local log_query = logger.init("unbound.query"..new_id());
local function callback_wrapper(a, err)
local gotdataat = gettime();
waiting_queries[ret] = nil;
if a then
prep_answer(a);
log_query("debug", "Results for %s %s %s: %s (%s, %f sec)", qname, qclass, qtype, a.rcode == 0 and (#a .. " items") or a.status,
a.secure and "Secure" or a.bogus or "Insecure", gotdataat - startedat); -- Insecure as in unsigned
else
log_query("error", "Results for %s %s %s: %s", qname, qclass, qtype, tostring(err));
end
local ok, cerr = pcall(callback, a, err);
if not ok then log_query("error", "Error in callback: %s", cerr); end
end
log_query("debug", "Resolve %s %s %s", qname, qclass, qtype);
local err;
ret, err = unbound:resolve_async(callback_wrapper, qname, ntype, nclass);
if ret then
waiting_queries[ret] = callback;
else
log_query("error", "Resolver error: %s", err);
end
return ret, err;
end
local function lookup_sync(qname, qtype, qclass)
if not unbound then initialize(); end
qtype = qtype and s_upper(qtype) or "A";
qclass = qclass and s_upper(qclass) or "IN";
local ntype, nclass = types[qtype], classes[qclass];
local a, err = unbound:resolve(qname, ntype, nclass);
if not a then return a, err; end
return prep_answer(a);
end
local function cancel(id)
local cb = waiting_queries[id];
unbound:cancel(id);
if cb then
cb(nil, "canceled");
waiting_queries[id] = nil;
end
return true;
end
-- Reinitiate libunbound context, drops cache
local function purge()
for id in pairs(waiting_queries) do cancel(id); end
if server_conn then server_conn:close(); end
initialize();
return true;
end
local function not_implemented()
error "not implemented";
end
-- Public API
local _M = {
lookup = lookup;
cancel = cancel;
new_async_socket = not_implemented;
dns = {
lookup = lookup_sync;
cancel = cancel;
cache = noop;
socket_wrapper_set = noop;
settimeout = noop;
query = noop;
purge = purge;
random = noop;
peek = noop;
types = types;
classes = classes;
};
};
local function lookup_promise(_, qname, qtype, qclass)
return promise.new(function (resolve, reject)
local function callback(answer, err)
if err then
return reject(err);
else
return resolve(answer);
end
end
local ret, err = lookup(callback, qname, qtype, qclass)
if not ret then reject(err); end
end);
end
local wrapper = {
lookup = function (_, callback, qname, qtype, qclass)
return lookup(callback, qname, qtype, qclass)
end;
lookup_promise = lookup_promise;
_resolver = {
settimeout = function () end;
closeall = function () end;
};
}
function _M.resolver() return wrapper; end
return _M;
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