Sun, 20 Sep 2009 15:31:51 +0100
Merge with 0.5
1523
841d61be198f
Remove version number from copyright headers
Matthew Wild <mwild1@gmail.com>
parents:
1202
diff
changeset
|
1 | -- Prosody IM |
615 | 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' | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
19 | local require = require |
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
20 | local os = os; |
337 | 21 | |
22 | local coroutine, io, math, socket, string, table = | |
23 | coroutine, io, math, socket, string, table | |
24 | ||
1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
25 | local ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack = |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
26 | ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack |
337 | 27 | |
28 | local get, set = ztact.get, ztact.set | |
29 | ||
30 | ||
31 | -------------------------------------------------- module dns | |
32 | module ('dns') | |
33 | local dns = _M; | |
34 | ||
35 | ||
36 | -- dns type & class codes ------------------------------ dns type & class codes | |
37 | ||
38 | ||
39 | local append = table.insert | |
40 | ||
41 | ||
42 | local function highbyte (i) -- - - - - - - - - - - - - - - - - - - highbyte | |
43 | return (i-(i%0x100))/0x100 | |
44 | end | |
45 | ||
46 | ||
47 | local function augment (t) -- - - - - - - - - - - - - - - - - - - - augment | |
48 | local a = {} | |
49 | for i,s in pairs (t) do a[i] = s a[s] = s a[string.lower (s)] = s end | |
50 | return a | |
51 | end | |
52 | ||
53 | ||
54 | local function encode (t) -- - - - - - - - - - - - - - - - - - - - - encode | |
55 | local code = {} | |
56 | for i,s in pairs (t) do | |
57 | local word = string.char (highbyte (i), i %0x100) | |
58 | code[i] = word | |
59 | code[s] = word | |
60 | code[string.lower (s)] = word | |
61 | end | |
62 | return code | |
63 | end | |
64 | ||
65 | ||
66 | dns.types = { | |
67 | 'A', 'NS', 'MD', 'MF', 'CNAME', 'SOA', 'MB', 'MG', 'MR', 'NULL', 'WKS', | |
68 | 'PTR', 'HINFO', 'MINFO', 'MX', 'TXT', | |
69 | [ 28] = 'AAAA', [ 29] = 'LOC', [ 33] = 'SRV', | |
70 | [252] = 'AXFR', [253] = 'MAILB', [254] = 'MAILA', [255] = '*' } | |
71 | ||
72 | ||
73 | dns.classes = { 'IN', 'CS', 'CH', 'HS', [255] = '*' } | |
74 | ||
75 | ||
76 | dns.type = augment (dns.types) | |
77 | dns.class = augment (dns.classes) | |
78 | dns.typecode = encode (dns.types) | |
79 | dns.classcode = encode (dns.classes) | |
80 | ||
81 | ||
82 | ||
83 | local function standardize (qname, qtype, qclass) -- - - - - - - standardize | |
84 | if string.byte (qname, -1) ~= 0x2E then qname = qname..'.' end | |
85 | qname = string.lower (qname) | |
86 | return qname, dns.type[qtype or 'A'], dns.class[qclass or 'IN'] | |
87 | end | |
88 | ||
89 | ||
90 | local function prune (rrs, time, soft) -- - - - - - - - - - - - - - - prune | |
91 | ||
92 | time = time or socket.gettime () | |
93 | for i,rr in pairs (rrs) do | |
94 | ||
95 | if rr.tod then | |
96 | -- rr.tod = rr.tod - 50 -- accelerated decripitude | |
97 | rr.ttl = math.floor (rr.tod - time) | |
98 | if rr.ttl <= 0 then rrs[i] = nil end | |
99 | ||
100 | elseif soft == 'soft' then -- What is this? I forget! | |
101 | assert (rr.ttl == 0) | |
102 | rrs[i] = nil | |
103 | end end end | |
104 | ||
105 | ||
106 | -- metatables & co. ------------------------------------------ metatables & co. | |
107 | ||
108 | ||
109 | local resolver = {} | |
110 | resolver.__index = resolver | |
111 | ||
112 | ||
113 | local SRV_tostring | |
114 | ||
115 | ||
116 | local rr_metatable = {} -- - - - - - - - - - - - - - - - - - - rr_metatable | |
117 | function rr_metatable.__tostring (rr) | |
118 | local s0 = string.format ( | |
119 | '%2s %-5s %6i %-28s', rr.class, rr.type, rr.ttl, rr.name ) | |
120 | local s1 = '' | |
121 | if rr.type == 'A' then s1 = ' '..rr.a | |
122 | elseif rr.type == 'MX' then | |
123 | s1 = string.format (' %2i %s', rr.pref, rr.mx) | |
124 | elseif rr.type == 'CNAME' then s1 = ' '..rr.cname | |
125 | elseif rr.type == 'LOC' then s1 = ' '..resolver.LOC_tostring (rr) | |
126 | elseif rr.type == 'NS' then s1 = ' '..rr.ns | |
127 | elseif rr.type == 'SRV' then s1 = ' '..SRV_tostring (rr) | |
128 | elseif rr.type == 'TXT' then s1 = ' '..rr.txt | |
129 | else s1 = ' <UNKNOWN RDATA TYPE>' end | |
130 | return s0..s1 | |
131 | end | |
132 | ||
133 | ||
134 | local rrs_metatable = {} -- - - - - - - - - - - - - - - - - - rrs_metatable | |
135 | function rrs_metatable.__tostring (rrs) | |
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
136 | local t = {} |
337 | 137 | for i,rr in pairs (rrs) do append (t, tostring (rr)..'\n') end |
138 | return table.concat (t) | |
139 | end | |
140 | ||
141 | ||
142 | local cache_metatable = {} -- - - - - - - - - - - - - - - - cache_metatable | |
143 | function cache_metatable.__tostring (cache) | |
144 | local time = socket.gettime () | |
145 | local t = {} | |
146 | for class,types in pairs (cache) do | |
147 | for type,names in pairs (types) do | |
148 | for name,rrs in pairs (names) do | |
149 | prune (rrs, time) | |
150 | append (t, tostring (rrs)) end end end | |
151 | return table.concat (t) | |
152 | end | |
153 | ||
154 | ||
155 | function resolver:new () -- - - - - - - - - - - - - - - - - - - - - resolver | |
156 | local r = { active = {}, cache = {}, unsorted = {} } | |
157 | setmetatable (r, resolver) | |
158 | setmetatable (r.cache, cache_metatable) | |
159 | setmetatable (r.unsorted, { __mode = 'kv' }) | |
160 | return r | |
161 | end | |
162 | ||
163 | ||
164 | -- packet layer -------------------------------------------------- packet layer | |
165 | ||
166 | ||
167 | function dns.random (...) -- - - - - - - - - - - - - - - - - - - dns.random | |
168 | math.randomseed (10000*socket.gettime ()) | |
169 | dns.random = math.random | |
170 | return dns.random (...) | |
171 | end | |
172 | ||
173 | ||
174 | local function encodeHeader (o) -- - - - - - - - - - - - - - - encodeHeader | |
175 | ||
176 | o = o or {} | |
177 | ||
178 | o.id = o.id or -- 16b (random) id | |
179 | dns.random (0, 0xffff) | |
180 | ||
181 | o.rd = o.rd or 1 -- 1b 1 recursion desired | |
182 | o.tc = o.tc or 0 -- 1b 1 truncated response | |
183 | o.aa = o.aa or 0 -- 1b 1 authoritative response | |
184 | o.opcode = o.opcode or 0 -- 4b 0 query | |
185 | -- 1 inverse query | |
186 | -- 2 server status request | |
187 | -- 3-15 reserved | |
188 | o.qr = o.qr or 0 -- 1b 0 query, 1 response | |
189 | ||
190 | o.rcode = o.rcode or 0 -- 4b 0 no error | |
191 | -- 1 format error | |
192 | -- 2 server failure | |
193 | -- 3 name error | |
194 | -- 4 not implemented | |
195 | -- 5 refused | |
196 | -- 6-15 reserved | |
197 | o.z = o.z or 0 -- 3b 0 resvered | |
198 | o.ra = o.ra or 0 -- 1b 1 recursion available | |
199 | ||
200 | o.qdcount = o.qdcount or 1 -- 16b number of question RRs | |
201 | o.ancount = o.ancount or 0 -- 16b number of answers RRs | |
202 | o.nscount = o.nscount or 0 -- 16b number of nameservers RRs | |
203 | o.arcount = o.arcount or 0 -- 16b number of additional RRs | |
204 | ||
205 | -- string.char() rounds, so prevent roundup with -0.4999 | |
206 | local header = string.char ( | |
207 | highbyte (o.id), o.id %0x100, | |
208 | o.rd + 2*o.tc + 4*o.aa + 8*o.opcode + 128*o.qr, | |
209 | o.rcode + 16*o.z + 128*o.ra, | |
210 | highbyte (o.qdcount), o.qdcount %0x100, | |
211 | highbyte (o.ancount), o.ancount %0x100, | |
212 | highbyte (o.nscount), o.nscount %0x100, | |
213 | highbyte (o.arcount), o.arcount %0x100 ) | |
214 | ||
215 | return header, o.id | |
216 | end | |
217 | ||
218 | ||
219 | local function encodeName (name) -- - - - - - - - - - - - - - - - encodeName | |
220 | local t = {} | |
221 | for part in string.gmatch (name, '[^.]+') do | |
222 | append (t, string.char (string.len (part))) | |
223 | append (t, part) | |
224 | end | |
225 | append (t, string.char (0)) | |
226 | return table.concat (t) | |
227 | end | |
228 | ||
229 | ||
230 | local function encodeQuestion (qname, qtype, qclass) -- - - - encodeQuestion | |
231 | qname = encodeName (qname) | |
232 | qtype = dns.typecode[qtype or 'a'] | |
233 | qclass = dns.classcode[qclass or 'in'] | |
234 | return qname..qtype..qclass; | |
235 | end | |
236 | ||
237 | ||
238 | function resolver:byte (len) -- - - - - - - - - - - - - - - - - - - - - byte | |
239 | len = len or 1 | |
240 | local offset = self.offset | |
241 | local last = offset + len - 1 | |
242 | if last > #self.packet then | |
243 | error (string.format ('out of bounds: %i>%i', last, #self.packet)) end | |
244 | self.offset = offset + len | |
245 | return string.byte (self.packet, offset, last) | |
246 | end | |
247 | ||
248 | ||
249 | function resolver:word () -- - - - - - - - - - - - - - - - - - - - - - word | |
250 | local b1, b2 = self:byte (2) | |
251 | return 0x100*b1 + b2 | |
252 | end | |
253 | ||
254 | ||
255 | function resolver:dword () -- - - - - - - - - - - - - - - - - - - - - dword | |
256 | local b1, b2, b3, b4 = self:byte (4) | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
257 | --print ('dword', b1, b2, b3, b4) |
337 | 258 | return 0x1000000*b1 + 0x10000*b2 + 0x100*b3 + b4 |
259 | end | |
260 | ||
261 | ||
262 | function resolver:sub (len) -- - - - - - - - - - - - - - - - - - - - - - sub | |
263 | len = len or 1 | |
264 | local s = string.sub (self.packet, self.offset, self.offset + len - 1) | |
265 | self.offset = self.offset + len | |
266 | return s | |
267 | end | |
268 | ||
269 | ||
270 | function resolver:header (force) -- - - - - - - - - - - - - - - - - - header | |
271 | ||
272 | local id = self:word () | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
273 | --print (string.format (':header id %x', id)) |
337 | 274 | if not self.active[id] and not force then return nil end |
275 | ||
276 | local h = { id = id } | |
277 | ||
278 | local b1, b2 = self:byte (2) | |
279 | ||
280 | h.rd = b1 %2 | |
281 | h.tc = b1 /2%2 | |
282 | h.aa = b1 /4%2 | |
283 | h.opcode = b1 /8%16 | |
284 | h.qr = b1 /128 | |
285 | ||
286 | h.rcode = b2 %16 | |
287 | h.z = b2 /16%8 | |
288 | h.ra = b2 /128 | |
289 | ||
290 | h.qdcount = self:word () | |
291 | h.ancount = self:word () | |
292 | h.nscount = self:word () | |
293 | h.arcount = self:word () | |
294 | ||
295 | for k,v in pairs (h) do h[k] = v-v%1 end | |
296 | ||
297 | return h | |
298 | end | |
299 | ||
300 | ||
301 | function resolver:name () -- - - - - - - - - - - - - - - - - - - - - - name | |
302 | local remember, pointers = nil, 0 | |
303 | local len = self:byte () | |
304 | local n = {} | |
305 | while len > 0 do | |
306 | if len >= 0xc0 then -- name is "compressed" | |
307 | pointers = pointers + 1 | |
308 | if pointers >= 20 then error ('dns error: 20 pointers') end | |
309 | local offset = ((len-0xc0)*0x100) + self:byte () | |
310 | remember = remember or self.offset | |
311 | self.offset = offset + 1 -- +1 for lua | |
312 | else -- name is not compressed | |
313 | append (n, self:sub (len)..'.') | |
314 | end | |
315 | len = self:byte () | |
316 | end | |
317 | self.offset = remember or self.offset | |
318 | return table.concat (n) | |
319 | end | |
320 | ||
321 | ||
322 | function resolver:question () -- - - - - - - - - - - - - - - - - - question | |
323 | local q = {} | |
324 | q.name = self:name () | |
325 | q.type = dns.type[self:word ()] | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
326 | q.class = dns.class[self:word ()] |
337 | 327 | return q |
328 | end | |
329 | ||
330 | ||
331 | function resolver:A (rr) -- - - - - - - - - - - - - - - - - - - - - - - - A | |
332 | local b1, b2, b3, b4 = self:byte (4) | |
333 | rr.a = string.format ('%i.%i.%i.%i', b1, b2, b3, b4) | |
334 | end | |
335 | ||
336 | ||
337 | function resolver:CNAME (rr) -- - - - - - - - - - - - - - - - - - - - CNAME | |
338 | rr.cname = self:name () | |
339 | end | |
340 | ||
341 | ||
342 | function resolver:MX (rr) -- - - - - - - - - - - - - - - - - - - - - - - MX | |
343 | rr.pref = self:word () | |
344 | rr.mx = self:name () | |
345 | end | |
346 | ||
347 | ||
348 | function resolver:LOC_nibble_power () -- - - - - - - - - - LOC_nibble_power | |
349 | local b = self:byte () | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
350 | --print ('nibbles', ((b-(b%0x10))/0x10), (b%0x10)) |
337 | 351 | return ((b-(b%0x10))/0x10) * (10^(b%0x10)) |
352 | end | |
353 | ||
354 | ||
355 | function resolver:LOC (rr) -- - - - - - - - - - - - - - - - - - - - - - LOC | |
356 | rr.version = self:byte () | |
357 | if rr.version == 0 then | |
358 | rr.loc = rr.loc or {} | |
359 | rr.loc.size = self:LOC_nibble_power () | |
360 | rr.loc.horiz_pre = self:LOC_nibble_power () | |
361 | rr.loc.vert_pre = self:LOC_nibble_power () | |
362 | rr.loc.latitude = self:dword () | |
363 | rr.loc.longitude = self:dword () | |
364 | rr.loc.altitude = self:dword () | |
365 | end end | |
366 | ||
367 | ||
368 | local function LOC_tostring_degrees (f, pos, neg) -- - - - - - - - - - - - - | |
369 | f = f - 0x80000000 | |
370 | if f < 0 then pos = neg f = -f end | |
371 | local deg, min, msec | |
372 | msec = f%60000 | |
373 | f = (f-msec)/60000 | |
374 | min = f%60 | |
375 | deg = (f-min)/60 | |
376 | return string.format ('%3d %2d %2.3f %s', deg, min, msec/1000, pos) | |
377 | end | |
378 | ||
379 | ||
380 | function resolver.LOC_tostring (rr) -- - - - - - - - - - - - - LOC_tostring | |
381 | ||
382 | local t = {} | |
383 | ||
384 | --[[ | |
385 | for k,name in pairs { 'size', 'horiz_pre', 'vert_pre', | |
386 | 'latitude', 'longitude', 'altitude' } do | |
387 | append (t, string.format ('%4s%-10s: %12.0f\n', '', name, rr.loc[name])) | |
388 | end | |
389 | --]] | |
390 | ||
391 | append ( t, string.format ( | |
392 | '%s %s %.2fm %.2fm %.2fm %.2fm', | |
393 | LOC_tostring_degrees (rr.loc.latitude, 'N', 'S'), | |
394 | LOC_tostring_degrees (rr.loc.longitude, 'E', 'W'), | |
395 | (rr.loc.altitude - 10000000) / 100, | |
396 | rr.loc.size / 100, | |
397 | rr.loc.horiz_pre / 100, | |
398 | rr.loc.vert_pre / 100 ) ) | |
399 | ||
400 | return table.concat (t) | |
401 | end | |
402 | ||
403 | ||
404 | function resolver:NS (rr) -- - - - - - - - - - - - - - - - - - - - - - - NS | |
405 | rr.ns = self:name () | |
406 | end | |
407 | ||
408 | ||
409 | function resolver:SOA (rr) -- - - - - - - - - - - - - - - - - - - - - - SOA | |
410 | end | |
411 | ||
412 | ||
413 | function resolver:SRV (rr) -- - - - - - - - - - - - - - - - - - - - - - SRV | |
414 | rr.srv = {} | |
415 | rr.srv.priority = self:word () | |
416 | rr.srv.weight = self:word () | |
417 | rr.srv.port = self:word () | |
418 | rr.srv.target = self:name () | |
419 | end | |
420 | ||
421 | ||
422 | function SRV_tostring (rr) -- - - - - - - - - - - - - - - - - - SRV_tostring | |
423 | local s = rr.srv | |
424 | return string.format ( '%5d %5d %5d %s', | |
425 | s.priority, s.weight, s.port, s.target ) | |
426 | end | |
427 | ||
428 | ||
429 | function resolver:TXT (rr) -- - - - - - - - - - - - - - - - - - - - - - TXT | |
430 | rr.txt = self:sub (rr.rdlength) | |
431 | end | |
432 | ||
433 | ||
434 | function resolver:rr () -- - - - - - - - - - - - - - - - - - - - - - - - rr | |
435 | local rr = {} | |
436 | setmetatable (rr, rr_metatable) | |
437 | rr.name = self:name (self) | |
438 | rr.type = dns.type[self:word ()] or rr.type | |
439 | rr.class = dns.class[self:word ()] or rr.class | |
440 | rr.ttl = 0x10000*self:word () + self:word () | |
441 | rr.rdlength = self:word () | |
442 | ||
443 | if rr.ttl == 0 then -- pass | |
444 | else rr.tod = self.time + rr.ttl end | |
445 | ||
446 | local remember = self.offset | |
447 | local rr_parser = self[dns.type[rr.type]] | |
448 | if rr_parser then rr_parser (self, rr) end | |
449 | self.offset = remember | |
450 | rr.rdata = self:sub (rr.rdlength) | |
451 | return rr | |
452 | end | |
453 | ||
454 | ||
455 | function resolver:rrs (count) -- - - - - - - - - - - - - - - - - - - - - rrs | |
456 | local rrs = {} | |
457 | for i = 1,count do append (rrs, self:rr ()) end | |
458 | return rrs | |
459 | end | |
460 | ||
461 | ||
462 | function resolver:decode (packet, force) -- - - - - - - - - - - - - - decode | |
463 | ||
464 | self.packet, self.offset = packet, 1 | |
465 | local header = self:header (force) | |
466 | if not header then return nil end | |
467 | local response = { header = header } | |
468 | ||
469 | response.question = {} | |
470 | local offset = self.offset | |
471 | for i = 1,response.header.qdcount do | |
472 | append (response.question, self:question ()) end | |
473 | response.question.raw = string.sub (self.packet, offset, self.offset - 1) | |
474 | ||
475 | if not force then | |
476 | if not self.active[response.header.id] or | |
477 | not self.active[response.header.id][response.question.raw] then | |
478 | return nil end end | |
479 | ||
480 | response.answer = self:rrs (response.header.ancount) | |
481 | response.authority = self:rrs (response.header.nscount) | |
482 | response.additional = self:rrs (response.header.arcount) | |
483 | ||
484 | return response | |
485 | end | |
486 | ||
487 | ||
488 | -- socket layer -------------------------------------------------- socket layer | |
489 | ||
490 | ||
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
491 | resolver.delays = { 1, 3 } |
337 | 492 | |
493 | ||
494 | function resolver:addnameserver (address) -- - - - - - - - - - addnameserver | |
495 | self.server = self.server or {} | |
496 | append (self.server, address) | |
497 | end | |
498 | ||
499 | ||
500 | function resolver:setnameserver (address) -- - - - - - - - - - setnameserver | |
501 | self.server = {} | |
502 | self:addnameserver (address) | |
503 | end | |
504 | ||
505 | ||
506 | 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
|
507 | 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
|
508 | if resolv_conf then |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
509 | 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
|
510 | 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
|
511 | 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
|
512 | end |
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
513 | elseif os.getenv("WINDIR") then |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
514 | self:addnameserver ("208.67.222.222") |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
515 | self:addnameserver ("208.67.220.220") |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
516 | end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
517 | if not self.server or #self.server == 0 then |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
518 | self:addnameserver("127.0.0.1"); |
399
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
519 | end |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
520 | end |
337 | 521 | |
522 | ||
523 | function resolver:getsocket (servernum) -- - - - - - - - - - - - - getsocket | |
524 | ||
525 | self.socket = self.socket or {} | |
526 | self.socketset = self.socketset or {} | |
527 | ||
528 | local sock = self.socket[servernum] | |
529 | if sock then return sock end | |
530 | ||
531 | sock = socket.udp () | |
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
532 | if self.socket_wrapper then sock = self.socket_wrapper (sock, self) end |
337 | 533 | sock:settimeout (0) |
534 | -- todo: attempt to use a random port, fallback to 0 | |
535 | sock:setsockname ('*', 0) | |
536 | sock:setpeername (self.server[servernum], 53) | |
537 | self.socket[servernum] = sock | |
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
538 | self.socketset[sock] = servernum |
337 | 539 | return sock |
540 | end | |
541 | ||
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
542 | function resolver:voidsocket (sock) |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
543 | if self.socket[sock] then |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
544 | self.socketset[self.socket[sock]] = nil |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
545 | self.socket[sock] = nil |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
546 | elseif self.socketset[sock] then |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
547 | self.socket[self.socketset[sock]] = nil |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
548 | self.socketset[sock] = nil |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
549 | end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
550 | end |
337 | 551 | |
552 | function resolver:socket_wrapper_set (func) -- - - - - - - socket_wrapper_set | |
553 | self.socket_wrapper = func | |
554 | end | |
555 | ||
556 | ||
557 | function resolver:closeall () -- - - - - - - - - - - - - - - - - - closeall | |
558 | for i,sock in ipairs (self.socket) do self.socket[i]:close () end | |
559 | self.socket = {} | |
560 | end | |
561 | ||
562 | ||
563 | function resolver:remember (rr, type) -- - - - - - - - - - - - - - remember | |
564 | ||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
565 | --print ('remember', type, rr.class, rr.type, rr.name) |
337 | 566 | |
567 | if type ~= '*' then | |
568 | type = rr.type | |
569 | local all = get (self.cache, rr.class, '*', rr.name) | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
570 | --print ('remember all', all) |
337 | 571 | if all then append (all, rr) end |
572 | end | |
573 | ||
574 | self.cache = self.cache or setmetatable ({}, cache_metatable) | |
575 | local rrs = get (self.cache, rr.class, type, rr.name) or | |
576 | set (self.cache, rr.class, type, rr.name, setmetatable ({}, rrs_metatable)) | |
577 | append (rrs, rr) | |
578 | ||
579 | if type == 'MX' then self.unsorted[rrs] = true end | |
580 | end | |
581 | ||
582 | ||
583 | local function comp_mx (a, b) -- - - - - - - - - - - - - - - - - - - comp_mx | |
584 | return (a.pref == b.pref) and (a.mx < b.mx) or (a.pref < b.pref) | |
585 | end | |
586 | ||
587 | ||
588 | function resolver:peek (qname, qtype, qclass) -- - - - - - - - - - - - peek | |
589 | qname, qtype, qclass = standardize (qname, qtype, qclass) | |
590 | local rrs = get (self.cache, qclass, qtype, qname) | |
591 | if not rrs then return nil end | |
592 | if prune (rrs, socket.gettime ()) and qtype == '*' or not next (rrs) then | |
593 | set (self.cache, qclass, qtype, qname, nil) return nil end | |
594 | if self.unsorted[rrs] then table.sort (rrs, comp_mx) end | |
595 | return rrs | |
596 | end | |
597 | ||
598 | ||
599 | function resolver:purge (soft) -- - - - - - - - - - - - - - - - - - - purge | |
600 | if soft == 'soft' then | |
601 | self.time = socket.gettime () | |
602 | for class,types in pairs (self.cache or {}) do | |
603 | for type,names in pairs (types) do | |
604 | for name,rrs in pairs (names) do | |
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
605 | prune (rrs, self.time, 'soft') |
337 | 606 | end end end |
607 | else self.cache = {} end | |
608 | end | |
609 | ||
610 | ||
611 | function resolver:query (qname, qtype, qclass) -- - - - - - - - - - -- query | |
612 | ||
613 | qname, qtype, qclass = standardize (qname, qtype, qclass) | |
614 | ||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
615 | if not self.server then self:adddefaultnameservers () end |
337 | 616 | |
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
617 | local question = encodeQuestion (qname, qtype, qclass) |
337 | 618 | local peek = self:peek (qname, qtype, qclass) |
619 | if peek then return peek end | |
620 | ||
621 | local header, id = encodeHeader () | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
622 | --print ('query id', id, qclass, qtype, qname) |
337 | 623 | local o = { packet = header..question, |
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
624 | server = self.best_server, |
337 | 625 | delay = 1, |
626 | retry = socket.gettime () + self.delays[1] } | |
627 | ||
628 | -- remember the query | |
629 | self.active[id] = self.active[id] or {} | |
630 | self.active[id][question] = o | |
631 | ||
632 | -- remember which coroutine wants the answer | |
633 | local co = coroutine.running () | |
634 | if co then | |
635 | set (self.wanted, qclass, qtype, qname, co, true) | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
636 | --set (self.yielded, co, qclass, qtype, qname, true) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
637 | end |
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
638 | |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
639 | self:getsocket (o.server):send (o.packet) |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
640 | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
641 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
642 | |
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
643 | function resolver:servfail(sock) |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
644 | -- Resend all queries for this server |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
645 | |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
646 | local num = self.socketset[sock] |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
647 | |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
648 | -- Socket is dead now |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
649 | self:voidsocket(sock); |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
650 | |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
651 | -- Find all requests to the down server, and retry on the next server |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
652 | self.time = socket.gettime () |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
653 | for id,queries in pairs (self.active) do |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
654 | for question,o in pairs (queries) do |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
655 | if o.server == num then -- This request was to the broken server |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
656 | o.server = o.server + 1 -- Use next server |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
657 | if o.server > #self.server then |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
658 | o.server = 1 |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
659 | end |
337 | 660 | |
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
661 | o.retries = (o.retries or 0) + 1; |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
662 | if o.retries >= #self.server then |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
663 | --print ('timeout') |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
664 | queries[question] = nil |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
665 | else |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
666 | local _a = self:getsocket(o.server); |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
667 | if _a then _a:send (o.packet) end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
668 | end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
669 | end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
670 | end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
671 | end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
672 | |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
673 | if num == self.best_server then |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
674 | self.best_server = self.best_server + 1 |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
675 | if self.best_server > #self.server then |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
676 | -- Exhausted all servers, try first again |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
677 | self.best_server = 1 |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
678 | end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
679 | end |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
680 | end |
337 | 681 | |
682 | function resolver:receive (rset) -- - - - - - - - - - - - - - - - - receive | |
683 | ||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
684 | --print 'receive' print (self.socket) |
337 | 685 | self.time = socket.gettime () |
686 | rset = rset or self.socket | |
687 | ||
688 | local response | |
689 | for i,sock in pairs (rset) do | |
690 | ||
691 | if self.socketset[sock] then | |
692 | local packet = sock:receive () | |
693 | if packet then | |
694 | ||
695 | response = self:decode (packet) | |
696 | if response then | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
697 | --print 'received response' |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
698 | --self.print (response) |
337 | 699 | |
700 | for i,section in pairs { 'answer', 'authority', 'additional' } do | |
701 | for j,rr in pairs (response[section]) do | |
702 | self:remember (rr, response.question[1].type) end end | |
703 | ||
704 | -- retire the query | |
705 | local queries = self.active[response.header.id] | |
706 | if queries[response.question.raw] then | |
707 | queries[response.question.raw] = nil end | |
708 | if not next (queries) then self.active[response.header.id] = nil end | |
709 | if not next (self.active) then self:closeall () end | |
710 | ||
711 | -- was the query on the wanted list? | |
712 | local q = response.question | |
713 | local cos = get (self.wanted, q.class, q.type, q.name) | |
714 | if cos then | |
715 | for co in pairs (cos) do | |
716 | set (self.yielded, co, q.class, q.type, q.name, nil) | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
717 | if coroutine.status(co) == "suspended" then coroutine.resume (co) end |
337 | 718 | end |
719 | set (self.wanted, q.class, q.type, q.name, nil) | |
720 | end end end end end | |
721 | ||
722 | return response | |
723 | end | |
724 | ||
725 | ||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
726 | function resolver:feed(sock, packet) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
727 | --print 'receive' print (self.socket) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
728 | self.time = socket.gettime () |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
729 | |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
730 | local response = self:decode (packet) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
731 | if response then |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
732 | --print 'received response' |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
733 | --self.print (response) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
734 | |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
735 | for i,section in pairs { 'answer', 'authority', 'additional' } do |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
736 | for j,rr in pairs (response[section]) do |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
737 | self:remember (rr, response.question[1].type) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
738 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
739 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
740 | |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
741 | -- retire the query |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
742 | local queries = self.active[response.header.id] |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
743 | if queries[response.question.raw] then |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
744 | queries[response.question.raw] = nil |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
745 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
746 | if not next (queries) then self.active[response.header.id] = nil end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
747 | if not next (self.active) then self:closeall () end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
748 | |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
749 | -- was the query on the wanted list? |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
750 | local q = response.question[1] |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
751 | if q then |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
752 | local cos = get (self.wanted, q.class, q.type, q.name) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
753 | if cos then |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
754 | for co in pairs (cos) do |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
755 | set (self.yielded, co, q.class, q.type, q.name, nil) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
756 | if coroutine.status(co) == "suspended" then coroutine.resume (co) end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
757 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
758 | set (self.wanted, q.class, q.type, q.name, nil) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
759 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
760 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
761 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
762 | |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
763 | return response |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
764 | end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
765 | |
1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
766 | function resolver:cancel(data) |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
767 | local cos = get (self.wanted, unpack(data, 1, 3)) |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
768 | if cos then |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
769 | cos[data[4]] = nil; |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
770 | end |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
771 | end |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
772 | |
337 | 773 | function resolver:pulse () -- - - - - - - - - - - - - - - - - - - - - pulse |
774 | ||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
775 | --print ':pulse' |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
776 | while self:receive() do end |
337 | 777 | if not next (self.active) then return nil end |
778 | ||
779 | self.time = socket.gettime () | |
780 | for id,queries in pairs (self.active) do | |
781 | for question,o in pairs (queries) do | |
782 | if self.time >= o.retry then | |
783 | ||
784 | o.server = o.server + 1 | |
785 | if o.server > #self.server then | |
786 | o.server = 1 | |
787 | o.delay = o.delay + 1 | |
788 | end | |
789 | ||
790 | if o.delay > #self.delays then | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
791 | --print ('timeout') |
337 | 792 | queries[question] = nil |
793 | if not next (queries) then self.active[id] = nil end | |
794 | if not next (self.active) then return nil end | |
795 | else | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
796 | --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
|
797 | 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
|
798 | if _a then _a:send (o.packet) end |
337 | 799 | o.retry = self.time + self.delays[o.delay] |
800 | end end end end | |
801 | ||
802 | if next (self.active) then return true end | |
803 | return nil | |
804 | end | |
805 | ||
806 | ||
807 | function resolver:lookup (qname, qtype, qclass) -- - - - - - - - - - lookup | |
808 | self:query (qname, qtype, qclass) | |
809 | while self:pulse () do socket.select (self.socket, nil, 4) end | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
810 | --print (self.cache) |
337 | 811 | return self:peek (qname, qtype, qclass) |
812 | end | |
813 | ||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
814 | function resolver:lookupex (handler, qname, qtype, qclass) -- - - - - - - - - - lookup |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
815 | return self:peek (qname, qtype, qclass) or self:query (qname, qtype, qclass) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
816 | end |
337 | 817 | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
818 | |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
819 | --print ---------------------------------------------------------------- print |
337 | 820 | |
821 | ||
822 | local hints = { -- - - - - - - - - - - - - - - - - - - - - - - - - - - hints | |
823 | qr = { [0]='query', 'response' }, | |
824 | opcode = { [0]='query', 'inverse query', 'server status request' }, | |
825 | aa = { [0]='non-authoritative', 'authoritative' }, | |
826 | tc = { [0]='complete', 'truncated' }, | |
827 | rd = { [0]='recursion not desired', 'recursion desired' }, | |
828 | ra = { [0]='recursion not available', 'recursion available' }, | |
829 | z = { [0]='(reserved)' }, | |
830 | rcode = { [0]='no error', 'format error', 'server failure', 'name error', | |
831 | 'not implemented' }, | |
832 | ||
833 | type = dns.type, | |
834 | class = dns.class, } | |
835 | ||
836 | ||
837 | local function hint (p, s) -- - - - - - - - - - - - - - - - - - - - - - hint | |
838 | return (hints[s] and hints[s][p[s]]) or '' end | |
839 | ||
840 | ||
841 | function resolver.print (response) -- - - - - - - - - - - - - resolver.print | |
842 | ||
843 | for s,s in pairs { 'id', 'qr', 'opcode', 'aa', 'tc', 'rd', 'ra', 'z', | |
844 | 'rcode', 'qdcount', 'ancount', 'nscount', 'arcount' } do | |
845 | print ( string.format ('%-30s', 'header.'..s), | |
846 | response.header[s], hint (response.header, s) ) | |
847 | end | |
848 | ||
849 | for i,question in ipairs (response.question) do | |
850 | print (string.format ('question[%i].name ', i), question.name) | |
851 | print (string.format ('question[%i].type ', i), question.type) | |
852 | print (string.format ('question[%i].class ', i), question.class) | |
853 | end | |
854 | ||
855 | local common = { name=1, type=1, class=1, ttl=1, rdlength=1, rdata=1 } | |
856 | local tmp | |
857 | for s,s in pairs {'answer', 'authority', 'additional'} do | |
858 | for i,rr in pairs (response[s]) do | |
859 | for j,t in pairs { 'name', 'type', 'class', 'ttl', 'rdlength' } do | |
860 | tmp = string.format ('%s[%i].%s', s, i, t) | |
861 | print (string.format ('%-30s', tmp), rr[t], hint (rr, t)) | |
862 | end | |
863 | for j,t in pairs (rr) do | |
864 | if not common[j] then | |
865 | tmp = string.format ('%s[%i].%s', s, i, j) | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
866 | print (string.format ('%-30s %s', tostring(tmp), tostring(t))) |
337 | 867 | end end end end end |
868 | ||
869 | ||
870 | -- module api ------------------------------------------------------ module api | |
871 | ||
872 | ||
873 | local function resolve (func, ...) -- - - - - - - - - - - - - - resolver_get | |
874 | dns._resolver = dns._resolver or dns.resolver () | |
875 | return func (dns._resolver, ...) | |
876 | end | |
877 | ||
878 | ||
879 | function dns.resolver () -- - - - - - - - - - - - - - - - - - - - - resolver | |
880 | ||
881 | -- this function seems to be redundant with resolver.new () | |
882 | ||
1786
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
883 | local r = { active = {}, cache = {}, unsorted = {}, wanted = {}, yielded = {}, |
4016d8bc30b8
net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
1523
diff
changeset
|
884 | best_server = 1 } |
337 | 885 | setmetatable (r, resolver) |
886 | setmetatable (r.cache, cache_metatable) | |
887 | setmetatable (r.unsorted, { __mode = 'kv' }) | |
888 | return r | |
889 | end | |
890 | ||
891 | ||
892 | function dns.lookup (...) -- - - - - - - - - - - - - - - - - - - - - lookup | |
893 | return resolve (resolver.lookup, ...) end | |
894 | ||
895 | ||
896 | function dns.purge (...) -- - - - - - - - - - - - - - - - - - - - - - purge | |
897 | return resolve (resolver.purge, ...) end | |
898 | ||
899 | function dns.peek (...) -- - - - - - - - - - - - - - - - - - - - - - - peek | |
900 | return resolve (resolver.peek, ...) end | |
901 | ||
902 | ||
903 | function dns.query (...) -- - - - - - - - - - - - - - - - - - - - - - query | |
904 | return resolve (resolver.query, ...) end | |
905 | ||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
906 | function dns.feed (...) -- - - - - - - - - - - - - - - - - - - - - - feed |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
907 | return resolve (resolver.feed, ...) end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
908 | |
1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
909 | function dns.cancel(...) -- - - - - - - - - - - - - - - - - - - - - - cancel |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
894
diff
changeset
|
910 | return resolve(resolver.cancel, ...) end |
337 | 911 | |
912 | function dns:socket_wrapper_set (...) -- - - - - - - - - socket_wrapper_set | |
913 | return resolve (resolver.socket_wrapper_set, ...) end | |
914 | ||
915 | ||
916 | return dns |