1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
-- 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 zero = function() return 0 end;
local truop = function() return true; end;
local log = require "util.logger".init("unbound");
local net_server = require "net.server";
local libunbound = require"lunbound";
local have_promise, promise = pcall(require, "util.promise");
local gettime = require"socket".gettime;
local dns_utils = require"util.dns";
local classes, types, errors = dns_utils.classes, dns_utils.types, dns_utils.errors;
local parsers = dns_utils.parsers;
local function add_defaults(conf)
if conf then
for option, default in pairs(libunbound.config) do
if conf[option] == nil then
conf[option] = default;
end
end
end
return conf;
end
local unbound_config;
if prosody then
local config = require"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)
if server.watchfd then
return server.watchfd(unbound, function ()
unbound:process()
end);
elseif server.event and server.addevent then
local EV_READ = server.event.EV_READ;
local function event_callback()
unbound:process();
return EV_READ;
end
return server.addevent(unbound:getfd(), EV_READ, event_callback)
elseif server.wrapclient then
local conn = {
getfd = function()
return unbound:getfd();
end,
send = zero,
receive = noop,
settimeout = noop,
close = truop,
}
local function process()
unbound:process();
end
local listener = {
onincoming = process,
onconnect = noop,
ondisconnect = noop,
onreadtimeout = truop,
};
return server.wrapclient(conn, "dns", 0, listener, "*a" );
end
end
local unbound = libunbound.new(unbound_config);
local server_conn = connect_server(unbound, net_server);
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 };
for i = 1, #self do
t[i+1]=self.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)
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 function callback_wrapper(a, err)
local gotdataat = gettime();
waiting_queries[ret] = nil;
if a then
prep_answer(a);
log("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("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("error", "Error in callback: %s", cerr); end
end
log("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("warn", err);
end
return ret, err;
end
local function lookup_sync(qname, qtype, qclass)
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
unbound = libunbound.new(unbound_config);
server_conn = connect_server(unbound, net_server);
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 lookup_promise;
if have_promise then
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
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;
|
