Wed, 24 Dec 2008 18:48:09 +0000
Fix for not loading global modules when host-specific modules are specified in config
615 | 1 | -- Prosody IM v0.2 |
2 | -- This file is included with Prosody IM. It has modifications, | |
3 | -- which are hereby placed in the public domain. | |
337 | 4 | |
5 | -- public domain 20080404 lua@ztact.com | |
6 | ||
7 | ||
8 | -- todo: quick (default) header generation | |
9 | -- todo: nxdomain, error handling | |
10 | -- todo: cache results of encodeName | |
11 | ||
12 | ||
13 | -- reference: http://tools.ietf.org/html/rfc1035 | |
14 | -- reference: http://tools.ietf.org/html/rfc1876 (LOC) | |
15 | ||
16 | ||
17 | require 'socket' | |
18 | local ztact = require 'util.ztact' | |
19 | ||
20 | ||
21 | local coroutine, io, math, socket, string, table = | |
22 | coroutine, io, math, socket, string, table | |
23 | ||
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
24 | local ipairs, next, pairs, print, setmetatable, tostring, assert, error = |
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
25 | ipairs, next, pairs, print, setmetatable, tostring, assert, error |
337 | 26 | |
27 | local get, set = ztact.get, ztact.set | |
28 | ||
29 | ||
30 | -------------------------------------------------- module dns | |
31 | module ('dns') | |
32 | local dns = _M; | |
33 | ||
34 | ||
35 | -- dns type & class codes ------------------------------ dns type & class codes | |
36 | ||
37 | ||
38 | local append = table.insert | |
39 | ||
40 | ||
41 | local function highbyte (i) -- - - - - - - - - - - - - - - - - - - highbyte | |
42 | return (i-(i%0x100))/0x100 | |
43 | end | |
44 | ||
45 | ||
46 | local function augment (t) -- - - - - - - - - - - - - - - - - - - - augment | |
47 | local a = {} | |
48 | for i,s in pairs (t) do a[i] = s a[s] = s a[string.lower (s)] = s end | |
49 | return a | |
50 | end | |
51 | ||
52 | ||
53 | local function encode (t) -- - - - - - - - - - - - - - - - - - - - - encode | |
54 | local code = {} | |
55 | for i,s in pairs (t) do | |
56 | local word = string.char (highbyte (i), i %0x100) | |
57 | code[i] = word | |
58 | code[s] = word | |
59 | code[string.lower (s)] = word | |
60 | end | |
61 | return code | |
62 | end | |
63 | ||
64 | ||
65 | dns.types = { | |
66 | 'A', 'NS', 'MD', 'MF', 'CNAME', 'SOA', 'MB', 'MG', 'MR', 'NULL', 'WKS', | |
67 | 'PTR', 'HINFO', 'MINFO', 'MX', 'TXT', | |
68 | [ 28] = 'AAAA', [ 29] = 'LOC', [ 33] = 'SRV', | |
69 | [252] = 'AXFR', [253] = 'MAILB', [254] = 'MAILA', [255] = '*' } | |
70 | ||
71 | ||
72 | dns.classes = { 'IN', 'CS', 'CH', 'HS', [255] = '*' } | |
73 | ||
74 | ||
75 | dns.type = augment (dns.types) | |
76 | dns.class = augment (dns.classes) | |
77 | dns.typecode = encode (dns.types) | |
78 | dns.classcode = encode (dns.classes) | |
79 | ||
80 | ||
81 | ||
82 | local function standardize (qname, qtype, qclass) -- - - - - - - standardize | |
83 | if string.byte (qname, -1) ~= 0x2E then qname = qname..'.' end | |
84 | qname = string.lower (qname) | |
85 | return qname, dns.type[qtype or 'A'], dns.class[qclass or 'IN'] | |
86 | end | |
87 | ||
88 | ||
89 | local function prune (rrs, time, soft) -- - - - - - - - - - - - - - - prune | |
90 | ||
91 | time = time or socket.gettime () | |
92 | for i,rr in pairs (rrs) do | |
93 | ||
94 | if rr.tod then | |
95 | -- rr.tod = rr.tod - 50 -- accelerated decripitude | |
96 | rr.ttl = math.floor (rr.tod - time) | |
97 | if rr.ttl <= 0 then rrs[i] = nil end | |
98 | ||
99 | elseif soft == 'soft' then -- What is this? I forget! | |
100 | assert (rr.ttl == 0) | |
101 | rrs[i] = nil | |
102 | end end end | |
103 | ||
104 | ||
105 | -- metatables & co. ------------------------------------------ metatables & co. | |
106 | ||
107 | ||
108 | local resolver = {} | |
109 | resolver.__index = resolver | |
110 | ||
111 | ||
112 | local SRV_tostring | |
113 | ||
114 | ||
115 | local rr_metatable = {} -- - - - - - - - - - - - - - - - - - - rr_metatable | |
116 | function rr_metatable.__tostring (rr) | |
117 | local s0 = string.format ( | |
118 | '%2s %-5s %6i %-28s', rr.class, rr.type, rr.ttl, rr.name ) | |
119 | local s1 = '' | |
120 | if rr.type == 'A' then s1 = ' '..rr.a | |
121 | elseif rr.type == 'MX' then | |
122 | s1 = string.format (' %2i %s', rr.pref, rr.mx) | |
123 | elseif rr.type == 'CNAME' then s1 = ' '..rr.cname | |
124 | elseif rr.type == 'LOC' then s1 = ' '..resolver.LOC_tostring (rr) | |
125 | elseif rr.type == 'NS' then s1 = ' '..rr.ns | |
126 | elseif rr.type == 'SRV' then s1 = ' '..SRV_tostring (rr) | |
127 | elseif rr.type == 'TXT' then s1 = ' '..rr.txt | |
128 | else s1 = ' <UNKNOWN RDATA TYPE>' end | |
129 | return s0..s1 | |
130 | end | |
131 | ||
132 | ||
133 | local rrs_metatable = {} -- - - - - - - - - - - - - - - - - - rrs_metatable | |
134 | function rrs_metatable.__tostring (rrs) | |
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
135 | local t = {} |
337 | 136 | for i,rr in pairs (rrs) do append (t, tostring (rr)..'\n') end |
137 | return table.concat (t) | |
138 | end | |
139 | ||
140 | ||
141 | local cache_metatable = {} -- - - - - - - - - - - - - - - - cache_metatable | |
142 | function cache_metatable.__tostring (cache) | |
143 | local time = socket.gettime () | |
144 | local t = {} | |
145 | for class,types in pairs (cache) do | |
146 | for type,names in pairs (types) do | |
147 | for name,rrs in pairs (names) do | |
148 | prune (rrs, time) | |
149 | append (t, tostring (rrs)) end end end | |
150 | return table.concat (t) | |
151 | end | |
152 | ||
153 | ||
154 | function resolver:new () -- - - - - - - - - - - - - - - - - - - - - resolver | |
155 | local r = { active = {}, cache = {}, unsorted = {} } | |
156 | setmetatable (r, resolver) | |
157 | setmetatable (r.cache, cache_metatable) | |
158 | setmetatable (r.unsorted, { __mode = 'kv' }) | |
159 | return r | |
160 | end | |
161 | ||
162 | ||
163 | -- packet layer -------------------------------------------------- packet layer | |
164 | ||
165 | ||
166 | function dns.random (...) -- - - - - - - - - - - - - - - - - - - dns.random | |
167 | math.randomseed (10000*socket.gettime ()) | |
168 | dns.random = math.random | |
169 | return dns.random (...) | |
170 | end | |
171 | ||
172 | ||
173 | local function encodeHeader (o) -- - - - - - - - - - - - - - - encodeHeader | |
174 | ||
175 | o = o or {} | |
176 | ||
177 | o.id = o.id or -- 16b (random) id | |
178 | dns.random (0, 0xffff) | |
179 | ||
180 | o.rd = o.rd or 1 -- 1b 1 recursion desired | |
181 | o.tc = o.tc or 0 -- 1b 1 truncated response | |
182 | o.aa = o.aa or 0 -- 1b 1 authoritative response | |
183 | o.opcode = o.opcode or 0 -- 4b 0 query | |
184 | -- 1 inverse query | |
185 | -- 2 server status request | |
186 | -- 3-15 reserved | |
187 | o.qr = o.qr or 0 -- 1b 0 query, 1 response | |
188 | ||
189 | o.rcode = o.rcode or 0 -- 4b 0 no error | |
190 | -- 1 format error | |
191 | -- 2 server failure | |
192 | -- 3 name error | |
193 | -- 4 not implemented | |
194 | -- 5 refused | |
195 | -- 6-15 reserved | |
196 | o.z = o.z or 0 -- 3b 0 resvered | |
197 | o.ra = o.ra or 0 -- 1b 1 recursion available | |
198 | ||
199 | o.qdcount = o.qdcount or 1 -- 16b number of question RRs | |
200 | o.ancount = o.ancount or 0 -- 16b number of answers RRs | |
201 | o.nscount = o.nscount or 0 -- 16b number of nameservers RRs | |
202 | o.arcount = o.arcount or 0 -- 16b number of additional RRs | |
203 | ||
204 | -- string.char() rounds, so prevent roundup with -0.4999 | |
205 | local header = string.char ( | |
206 | highbyte (o.id), o.id %0x100, | |
207 | o.rd + 2*o.tc + 4*o.aa + 8*o.opcode + 128*o.qr, | |
208 | o.rcode + 16*o.z + 128*o.ra, | |
209 | highbyte (o.qdcount), o.qdcount %0x100, | |
210 | highbyte (o.ancount), o.ancount %0x100, | |
211 | highbyte (o.nscount), o.nscount %0x100, | |
212 | highbyte (o.arcount), o.arcount %0x100 ) | |
213 | ||
214 | return header, o.id | |
215 | end | |
216 | ||
217 | ||
218 | local function encodeName (name) -- - - - - - - - - - - - - - - - encodeName | |
219 | local t = {} | |
220 | for part in string.gmatch (name, '[^.]+') do | |
221 | append (t, string.char (string.len (part))) | |
222 | append (t, part) | |
223 | end | |
224 | append (t, string.char (0)) | |
225 | return table.concat (t) | |
226 | end | |
227 | ||
228 | ||
229 | local function encodeQuestion (qname, qtype, qclass) -- - - - encodeQuestion | |
230 | qname = encodeName (qname) | |
231 | qtype = dns.typecode[qtype or 'a'] | |
232 | qclass = dns.classcode[qclass or 'in'] | |
233 | return qname..qtype..qclass; | |
234 | end | |
235 | ||
236 | ||
237 | function resolver:byte (len) -- - - - - - - - - - - - - - - - - - - - - byte | |
238 | len = len or 1 | |
239 | local offset = self.offset | |
240 | local last = offset + len - 1 | |
241 | if last > #self.packet then | |
242 | error (string.format ('out of bounds: %i>%i', last, #self.packet)) end | |
243 | self.offset = offset + len | |
244 | return string.byte (self.packet, offset, last) | |
245 | end | |
246 | ||
247 | ||
248 | function resolver:word () -- - - - - - - - - - - - - - - - - - - - - - word | |
249 | local b1, b2 = self:byte (2) | |
250 | return 0x100*b1 + b2 | |
251 | end | |
252 | ||
253 | ||
254 | function resolver:dword () -- - - - - - - - - - - - - - - - - - - - - dword | |
255 | local b1, b2, b3, b4 = self:byte (4) | |
256 | -- print ('dword', b1, b2, b3, b4) | |
257 | return 0x1000000*b1 + 0x10000*b2 + 0x100*b3 + b4 | |
258 | end | |
259 | ||
260 | ||
261 | function resolver:sub (len) -- - - - - - - - - - - - - - - - - - - - - - sub | |
262 | len = len or 1 | |
263 | local s = string.sub (self.packet, self.offset, self.offset + len - 1) | |
264 | self.offset = self.offset + len | |
265 | return s | |
266 | end | |
267 | ||
268 | ||
269 | function resolver:header (force) -- - - - - - - - - - - - - - - - - - header | |
270 | ||
271 | local id = self:word () | |
272 | -- print (string.format (':header id %x', id)) | |
273 | if not self.active[id] and not force then return nil end | |
274 | ||
275 | local h = { id = id } | |
276 | ||
277 | local b1, b2 = self:byte (2) | |
278 | ||
279 | h.rd = b1 %2 | |
280 | h.tc = b1 /2%2 | |
281 | h.aa = b1 /4%2 | |
282 | h.opcode = b1 /8%16 | |
283 | h.qr = b1 /128 | |
284 | ||
285 | h.rcode = b2 %16 | |
286 | h.z = b2 /16%8 | |
287 | h.ra = b2 /128 | |
288 | ||
289 | h.qdcount = self:word () | |
290 | h.ancount = self:word () | |
291 | h.nscount = self:word () | |
292 | h.arcount = self:word () | |
293 | ||
294 | for k,v in pairs (h) do h[k] = v-v%1 end | |
295 | ||
296 | return h | |
297 | end | |
298 | ||
299 | ||
300 | function resolver:name () -- - - - - - - - - - - - - - - - - - - - - - name | |
301 | local remember, pointers = nil, 0 | |
302 | local len = self:byte () | |
303 | local n = {} | |
304 | while len > 0 do | |
305 | if len >= 0xc0 then -- name is "compressed" | |
306 | pointers = pointers + 1 | |
307 | if pointers >= 20 then error ('dns error: 20 pointers') end | |
308 | local offset = ((len-0xc0)*0x100) + self:byte () | |
309 | remember = remember or self.offset | |
310 | self.offset = offset + 1 -- +1 for lua | |
311 | else -- name is not compressed | |
312 | append (n, self:sub (len)..'.') | |
313 | end | |
314 | len = self:byte () | |
315 | end | |
316 | self.offset = remember or self.offset | |
317 | return table.concat (n) | |
318 | end | |
319 | ||
320 | ||
321 | function resolver:question () -- - - - - - - - - - - - - - - - - - question | |
322 | local q = {} | |
323 | q.name = self:name () | |
324 | q.type = dns.type[self:word ()] | |
325 | q.class = dns.type[self:word ()] | |
326 | return q | |
327 | end | |
328 | ||
329 | ||
330 | function resolver:A (rr) -- - - - - - - - - - - - - - - - - - - - - - - - A | |
331 | local b1, b2, b3, b4 = self:byte (4) | |
332 | rr.a = string.format ('%i.%i.%i.%i', b1, b2, b3, b4) | |
333 | end | |
334 | ||
335 | ||
336 | function resolver:CNAME (rr) -- - - - - - - - - - - - - - - - - - - - CNAME | |
337 | rr.cname = self:name () | |
338 | end | |
339 | ||
340 | ||
341 | function resolver:MX (rr) -- - - - - - - - - - - - - - - - - - - - - - - MX | |
342 | rr.pref = self:word () | |
343 | rr.mx = self:name () | |
344 | end | |
345 | ||
346 | ||
347 | function resolver:LOC_nibble_power () -- - - - - - - - - - LOC_nibble_power | |
348 | local b = self:byte () | |
349 | -- print ('nibbles', ((b-(b%0x10))/0x10), (b%0x10)) | |
350 | return ((b-(b%0x10))/0x10) * (10^(b%0x10)) | |
351 | end | |
352 | ||
353 | ||
354 | function resolver:LOC (rr) -- - - - - - - - - - - - - - - - - - - - - - LOC | |
355 | rr.version = self:byte () | |
356 | if rr.version == 0 then | |
357 | rr.loc = rr.loc or {} | |
358 | rr.loc.size = self:LOC_nibble_power () | |
359 | rr.loc.horiz_pre = self:LOC_nibble_power () | |
360 | rr.loc.vert_pre = self:LOC_nibble_power () | |
361 | rr.loc.latitude = self:dword () | |
362 | rr.loc.longitude = self:dword () | |
363 | rr.loc.altitude = self:dword () | |
364 | end end | |
365 | ||
366 | ||
367 | local function LOC_tostring_degrees (f, pos, neg) -- - - - - - - - - - - - - | |
368 | f = f - 0x80000000 | |
369 | if f < 0 then pos = neg f = -f end | |
370 | local deg, min, msec | |
371 | msec = f%60000 | |
372 | f = (f-msec)/60000 | |
373 | min = f%60 | |
374 | deg = (f-min)/60 | |
375 | return string.format ('%3d %2d %2.3f %s', deg, min, msec/1000, pos) | |
376 | end | |
377 | ||
378 | ||
379 | function resolver.LOC_tostring (rr) -- - - - - - - - - - - - - LOC_tostring | |
380 | ||
381 | local t = {} | |
382 | ||
383 | --[[ | |
384 | for k,name in pairs { 'size', 'horiz_pre', 'vert_pre', | |
385 | 'latitude', 'longitude', 'altitude' } do | |
386 | append (t, string.format ('%4s%-10s: %12.0f\n', '', name, rr.loc[name])) | |
387 | end | |
388 | --]] | |
389 | ||
390 | append ( t, string.format ( | |
391 | '%s %s %.2fm %.2fm %.2fm %.2fm', | |
392 | LOC_tostring_degrees (rr.loc.latitude, 'N', 'S'), | |
393 | LOC_tostring_degrees (rr.loc.longitude, 'E', 'W'), | |
394 | (rr.loc.altitude - 10000000) / 100, | |
395 | rr.loc.size / 100, | |
396 | rr.loc.horiz_pre / 100, | |
397 | rr.loc.vert_pre / 100 ) ) | |
398 | ||
399 | return table.concat (t) | |
400 | end | |
401 | ||
402 | ||
403 | function resolver:NS (rr) -- - - - - - - - - - - - - - - - - - - - - - - NS | |
404 | rr.ns = self:name () | |
405 | end | |
406 | ||
407 | ||
408 | function resolver:SOA (rr) -- - - - - - - - - - - - - - - - - - - - - - SOA | |
409 | end | |
410 | ||
411 | ||
412 | function resolver:SRV (rr) -- - - - - - - - - - - - - - - - - - - - - - SRV | |
413 | rr.srv = {} | |
414 | rr.srv.priority = self:word () | |
415 | rr.srv.weight = self:word () | |
416 | rr.srv.port = self:word () | |
417 | rr.srv.target = self:name () | |
418 | end | |
419 | ||
420 | ||
421 | function SRV_tostring (rr) -- - - - - - - - - - - - - - - - - - SRV_tostring | |
422 | local s = rr.srv | |
423 | return string.format ( '%5d %5d %5d %s', | |
424 | s.priority, s.weight, s.port, s.target ) | |
425 | end | |
426 | ||
427 | ||
428 | function resolver:TXT (rr) -- - - - - - - - - - - - - - - - - - - - - - TXT | |
429 | rr.txt = self:sub (rr.rdlength) | |
430 | end | |
431 | ||
432 | ||
433 | function resolver:rr () -- - - - - - - - - - - - - - - - - - - - - - - - rr | |
434 | local rr = {} | |
435 | setmetatable (rr, rr_metatable) | |
436 | rr.name = self:name (self) | |
437 | rr.type = dns.type[self:word ()] or rr.type | |
438 | rr.class = dns.class[self:word ()] or rr.class | |
439 | rr.ttl = 0x10000*self:word () + self:word () | |
440 | rr.rdlength = self:word () | |
441 | ||
442 | if rr.ttl == 0 then -- pass | |
443 | else rr.tod = self.time + rr.ttl end | |
444 | ||
445 | local remember = self.offset | |
446 | local rr_parser = self[dns.type[rr.type]] | |
447 | if rr_parser then rr_parser (self, rr) end | |
448 | self.offset = remember | |
449 | rr.rdata = self:sub (rr.rdlength) | |
450 | return rr | |
451 | end | |
452 | ||
453 | ||
454 | function resolver:rrs (count) -- - - - - - - - - - - - - - - - - - - - - rrs | |
455 | local rrs = {} | |
456 | for i = 1,count do append (rrs, self:rr ()) end | |
457 | return rrs | |
458 | end | |
459 | ||
460 | ||
461 | function resolver:decode (packet, force) -- - - - - - - - - - - - - - decode | |
462 | ||
463 | self.packet, self.offset = packet, 1 | |
464 | local header = self:header (force) | |
465 | if not header then return nil end | |
466 | local response = { header = header } | |
467 | ||
468 | response.question = {} | |
469 | local offset = self.offset | |
470 | for i = 1,response.header.qdcount do | |
471 | append (response.question, self:question ()) end | |
472 | response.question.raw = string.sub (self.packet, offset, self.offset - 1) | |
473 | ||
474 | if not force then | |
475 | if not self.active[response.header.id] or | |
476 | not self.active[response.header.id][response.question.raw] then | |
477 | return nil end end | |
478 | ||
479 | response.answer = self:rrs (response.header.ancount) | |
480 | response.authority = self:rrs (response.header.nscount) | |
481 | response.additional = self:rrs (response.header.arcount) | |
482 | ||
483 | return response | |
484 | end | |
485 | ||
486 | ||
487 | -- socket layer -------------------------------------------------- socket layer | |
488 | ||
489 | ||
490 | resolver.delays = { 1, 3, 11, 45 } | |
491 | ||
492 | ||
493 | function resolver:addnameserver (address) -- - - - - - - - - - addnameserver | |
494 | self.server = self.server or {} | |
495 | append (self.server, address) | |
496 | end | |
497 | ||
498 | ||
499 | function resolver:setnameserver (address) -- - - - - - - - - - setnameserver | |
500 | self.server = {} | |
501 | self:addnameserver (address) | |
502 | end | |
503 | ||
504 | ||
505 | function resolver:adddefaultnameservers () -- - - - - adddefaultnameservers | |
378
47fdbd074641
Fix dns for poor Windows users, who have never seen a resolv.conf
Matthew Wild <mwild1@gmail.com>
parents:
337
diff
changeset
|
506 | local resolv_conf = io.open("/etc/resolv.conf"); |
399
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
507 | if resolv_conf then |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
508 | for line in resolv_conf:lines() do |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
509 | local address = string.match (line, 'nameserver%s+(%d+%.%d+%.%d+%.%d+)') |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
510 | if address then self:addnameserver (address) end |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
511 | end |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
512 | else -- FIXME correct for windows, using opendns nameservers for now |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
513 | self:addnameserver ("208.67.222.222") |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
514 | self:addnameserver ("208.67.220.220") |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
515 | end |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
516 | end |
337 | 517 | |
518 | ||
519 | function resolver:getsocket (servernum) -- - - - - - - - - - - - - getsocket | |
520 | ||
521 | self.socket = self.socket or {} | |
522 | self.socketset = self.socketset or {} | |
523 | ||
524 | local sock = self.socket[servernum] | |
525 | if sock then return sock end | |
526 | ||
527 | sock = socket.udp () | |
528 | if self.socket_wrapper then sock = self.socket_wrapper (sock) end | |
529 | sock:settimeout (0) | |
530 | -- todo: attempt to use a random port, fallback to 0 | |
531 | sock:setsockname ('*', 0) | |
532 | sock:setpeername (self.server[servernum], 53) | |
533 | self.socket[servernum] = sock | |
534 | self.socketset[sock] = sock | |
535 | return sock | |
536 | end | |
537 | ||
538 | ||
539 | function resolver:socket_wrapper_set (func) -- - - - - - - socket_wrapper_set | |
540 | self.socket_wrapper = func | |
541 | end | |
542 | ||
543 | ||
544 | function resolver:closeall () -- - - - - - - - - - - - - - - - - - closeall | |
545 | for i,sock in ipairs (self.socket) do self.socket[i]:close () end | |
546 | self.socket = {} | |
547 | end | |
548 | ||
549 | ||
550 | function resolver:remember (rr, type) -- - - - - - - - - - - - - - remember | |
551 | ||
552 | -- print ('remember', type, rr.class, rr.type, rr.name) | |
553 | ||
554 | if type ~= '*' then | |
555 | type = rr.type | |
556 | local all = get (self.cache, rr.class, '*', rr.name) | |
557 | -- print ('remember all', all) | |
558 | if all then append (all, rr) end | |
559 | end | |
560 | ||
561 | self.cache = self.cache or setmetatable ({}, cache_metatable) | |
562 | local rrs = get (self.cache, rr.class, type, rr.name) or | |
563 | set (self.cache, rr.class, type, rr.name, setmetatable ({}, rrs_metatable)) | |
564 | append (rrs, rr) | |
565 | ||
566 | if type == 'MX' then self.unsorted[rrs] = true end | |
567 | end | |
568 | ||
569 | ||
570 | local function comp_mx (a, b) -- - - - - - - - - - - - - - - - - - - comp_mx | |
571 | return (a.pref == b.pref) and (a.mx < b.mx) or (a.pref < b.pref) | |
572 | end | |
573 | ||
574 | ||
575 | function resolver:peek (qname, qtype, qclass) -- - - - - - - - - - - - peek | |
576 | qname, qtype, qclass = standardize (qname, qtype, qclass) | |
577 | local rrs = get (self.cache, qclass, qtype, qname) | |
578 | if not rrs then return nil end | |
579 | if prune (rrs, socket.gettime ()) and qtype == '*' or not next (rrs) then | |
580 | set (self.cache, qclass, qtype, qname, nil) return nil end | |
581 | if self.unsorted[rrs] then table.sort (rrs, comp_mx) end | |
582 | return rrs | |
583 | end | |
584 | ||
585 | ||
586 | function resolver:purge (soft) -- - - - - - - - - - - - - - - - - - - purge | |
587 | if soft == 'soft' then | |
588 | self.time = socket.gettime () | |
589 | for class,types in pairs (self.cache or {}) do | |
590 | for type,names in pairs (types) do | |
591 | for name,rrs in pairs (names) do | |
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
592 | prune (rrs, self.time, 'soft') |
337 | 593 | end end end |
594 | else self.cache = {} end | |
595 | end | |
596 | ||
597 | ||
598 | function resolver:query (qname, qtype, qclass) -- - - - - - - - - - -- query | |
599 | ||
600 | qname, qtype, qclass = standardize (qname, qtype, qclass) | |
601 | ||
602 | if not self.server then self:adddefaultnameservers () end | |
603 | ||
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
604 | local question = encodeQuestion (qname, qtype, qclass) |
337 | 605 | local peek = self:peek (qname, qtype, qclass) |
606 | if peek then return peek end | |
607 | ||
608 | local header, id = encodeHeader () | |
609 | -- print ('query id', id, qclass, qtype, qname) | |
610 | local o = { packet = header..question, | |
611 | server = 1, | |
612 | delay = 1, | |
613 | retry = socket.gettime () + self.delays[1] } | |
614 | self:getsocket (o.server):send (o.packet) | |
615 | ||
616 | -- remember the query | |
617 | self.active[id] = self.active[id] or {} | |
618 | self.active[id][question] = o | |
619 | ||
620 | -- remember which coroutine wants the answer | |
621 | local co = coroutine.running () | |
622 | if co then | |
623 | set (self.wanted, qclass, qtype, qname, co, true) | |
624 | set (self.yielded, co, qclass, qtype, qname, true) | |
625 | end end | |
626 | ||
627 | ||
628 | function resolver:receive (rset) -- - - - - - - - - - - - - - - - - receive | |
629 | ||
630 | -- print 'receive' print (self.socket) | |
631 | self.time = socket.gettime () | |
632 | rset = rset or self.socket | |
633 | ||
634 | local response | |
635 | for i,sock in pairs (rset) do | |
636 | ||
637 | if self.socketset[sock] then | |
638 | local packet = sock:receive () | |
639 | if packet then | |
640 | ||
641 | response = self:decode (packet) | |
642 | if response then | |
643 | -- print 'received response' | |
644 | -- self.print (response) | |
645 | ||
646 | for i,section in pairs { 'answer', 'authority', 'additional' } do | |
647 | for j,rr in pairs (response[section]) do | |
648 | self:remember (rr, response.question[1].type) end end | |
649 | ||
650 | -- retire the query | |
651 | local queries = self.active[response.header.id] | |
652 | if queries[response.question.raw] then | |
653 | queries[response.question.raw] = nil end | |
654 | if not next (queries) then self.active[response.header.id] = nil end | |
655 | if not next (self.active) then self:closeall () end | |
656 | ||
657 | -- was the query on the wanted list? | |
658 | local q = response.question | |
659 | local cos = get (self.wanted, q.class, q.type, q.name) | |
660 | if cos then | |
661 | for co in pairs (cos) do | |
662 | set (self.yielded, co, q.class, q.type, q.name, nil) | |
663 | if not self.yielded[co] then coroutine.resume (co) end | |
664 | end | |
665 | set (self.wanted, q.class, q.type, q.name, nil) | |
666 | end end end end end | |
667 | ||
668 | return response | |
669 | end | |
670 | ||
671 | ||
672 | function resolver:pulse () -- - - - - - - - - - - - - - - - - - - - - pulse | |
673 | ||
674 | -- print ':pulse' | |
675 | while self:receive () do end | |
676 | if not next (self.active) then return nil end | |
677 | ||
678 | self.time = socket.gettime () | |
679 | for id,queries in pairs (self.active) do | |
680 | for question,o in pairs (queries) do | |
681 | if self.time >= o.retry then | |
682 | ||
683 | o.server = o.server + 1 | |
684 | if o.server > #self.server then | |
685 | o.server = 1 | |
686 | o.delay = o.delay + 1 | |
687 | end | |
688 | ||
689 | if o.delay > #self.delays then | |
690 | print ('timeout') | |
691 | queries[question] = nil | |
692 | if not next (queries) then self.active[id] = nil end | |
693 | if not next (self.active) then return nil end | |
694 | else | |
695 | -- print ('retry', o.server, o.delay) | |
453
a1efb2cb4f9c
Quickfix for dns.lua to not crash on failed connection to name servers
Waqas Hussain <waqas20@gmail.com>
parents:
399
diff
changeset
|
696 | local _a = self.socket[o.server]; |
a1efb2cb4f9c
Quickfix for dns.lua to not crash on failed connection to name servers
Waqas Hussain <waqas20@gmail.com>
parents:
399
diff
changeset
|
697 | if _a then _a:send (o.packet) end |
337 | 698 | o.retry = self.time + self.delays[o.delay] |
699 | end end end end | |
700 | ||
701 | if next (self.active) then return true end | |
702 | return nil | |
703 | end | |
704 | ||
705 | ||
706 | function resolver:lookup (qname, qtype, qclass) -- - - - - - - - - - lookup | |
707 | self:query (qname, qtype, qclass) | |
708 | while self:pulse () do socket.select (self.socket, nil, 4) end | |
709 | -- print (self.cache) | |
710 | return self:peek (qname, qtype, qclass) | |
711 | end | |
712 | ||
713 | ||
714 | -- print ---------------------------------------------------------------- print | |
715 | ||
716 | ||
717 | local hints = { -- - - - - - - - - - - - - - - - - - - - - - - - - - - hints | |
718 | qr = { [0]='query', 'response' }, | |
719 | opcode = { [0]='query', 'inverse query', 'server status request' }, | |
720 | aa = { [0]='non-authoritative', 'authoritative' }, | |
721 | tc = { [0]='complete', 'truncated' }, | |
722 | rd = { [0]='recursion not desired', 'recursion desired' }, | |
723 | ra = { [0]='recursion not available', 'recursion available' }, | |
724 | z = { [0]='(reserved)' }, | |
725 | rcode = { [0]='no error', 'format error', 'server failure', 'name error', | |
726 | 'not implemented' }, | |
727 | ||
728 | type = dns.type, | |
729 | class = dns.class, } | |
730 | ||
731 | ||
732 | local function hint (p, s) -- - - - - - - - - - - - - - - - - - - - - - hint | |
733 | return (hints[s] and hints[s][p[s]]) or '' end | |
734 | ||
735 | ||
736 | function resolver.print (response) -- - - - - - - - - - - - - resolver.print | |
737 | ||
738 | for s,s in pairs { 'id', 'qr', 'opcode', 'aa', 'tc', 'rd', 'ra', 'z', | |
739 | 'rcode', 'qdcount', 'ancount', 'nscount', 'arcount' } do | |
740 | print ( string.format ('%-30s', 'header.'..s), | |
741 | response.header[s], hint (response.header, s) ) | |
742 | end | |
743 | ||
744 | for i,question in ipairs (response.question) do | |
745 | print (string.format ('question[%i].name ', i), question.name) | |
746 | print (string.format ('question[%i].type ', i), question.type) | |
747 | print (string.format ('question[%i].class ', i), question.class) | |
748 | end | |
749 | ||
750 | local common = { name=1, type=1, class=1, ttl=1, rdlength=1, rdata=1 } | |
751 | local tmp | |
752 | for s,s in pairs {'answer', 'authority', 'additional'} do | |
753 | for i,rr in pairs (response[s]) do | |
754 | for j,t in pairs { 'name', 'type', 'class', 'ttl', 'rdlength' } do | |
755 | tmp = string.format ('%s[%i].%s', s, i, t) | |
756 | print (string.format ('%-30s', tmp), rr[t], hint (rr, t)) | |
757 | end | |
758 | for j,t in pairs (rr) do | |
759 | if not common[j] then | |
760 | tmp = string.format ('%s[%i].%s', s, i, j) | |
761 | print (string.format ('%-30s %s', tmp, t)) | |
762 | end end end end end | |
763 | ||
764 | ||
765 | -- module api ------------------------------------------------------ module api | |
766 | ||
767 | ||
768 | local function resolve (func, ...) -- - - - - - - - - - - - - - resolver_get | |
769 | dns._resolver = dns._resolver or dns.resolver () | |
770 | return func (dns._resolver, ...) | |
771 | end | |
772 | ||
773 | ||
774 | function dns.resolver () -- - - - - - - - - - - - - - - - - - - - - resolver | |
775 | ||
776 | -- this function seems to be redundant with resolver.new () | |
777 | ||
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
778 | local r = { active = {}, cache = {}, unsorted = {}, wanted = {}, yielded = {} } |
337 | 779 | setmetatable (r, resolver) |
780 | setmetatable (r.cache, cache_metatable) | |
781 | setmetatable (r.unsorted, { __mode = 'kv' }) | |
782 | return r | |
783 | end | |
784 | ||
785 | ||
786 | function dns.lookup (...) -- - - - - - - - - - - - - - - - - - - - - lookup | |
787 | return resolve (resolver.lookup, ...) end | |
788 | ||
789 | ||
790 | function dns.purge (...) -- - - - - - - - - - - - - - - - - - - - - - purge | |
791 | return resolve (resolver.purge, ...) end | |
792 | ||
793 | function dns.peek (...) -- - - - - - - - - - - - - - - - - - - - - - - peek | |
794 | return resolve (resolver.peek, ...) end | |
795 | ||
796 | ||
797 | function dns.query (...) -- - - - - - - - - - - - - - - - - - - - - - query | |
798 | return resolve (resolver.query, ...) end | |
799 | ||
800 | ||
801 | function dns:socket_wrapper_set (...) -- - - - - - - - - socket_wrapper_set | |
802 | return resolve (resolver.socket_wrapper_set, ...) end | |
803 | ||
804 | ||
805 | return dns |