Sat, 06 Dec 2008 19:51:10 +0000
Fix add_event_hook in module API
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1 | -- Prosody IM v0.1 |
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2 | -- Copyright (C) 2008 Matthew Wild |
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3 | -- Copyright (C) 2008 Waqas Hussain |
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4 | -- |
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5 | -- This program is free software; you can redistribute it and/or |
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6 | -- modify it under the terms of the GNU General Public License |
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7 | -- as published by the Free Software Foundation; either version 2 |
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8 | -- of the License, or (at your option) any later version. |
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9 | -- |
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10 | -- This program is distributed in the hope that it will be useful, |
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11 | -- but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | -- GNU General Public License for more details. |
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14 | -- |
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15 | -- You should have received a copy of the GNU General Public License |
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16 | -- along with this program; if not, write to the Free Software |
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17 | -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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18 | -- |
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19 | |
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20 | |
337 | 21 | |
22 | ||
23 | -- public domain 20080404 lua@ztact.com | |
24 | ||
25 | ||
26 | -- todo: quick (default) header generation | |
27 | -- todo: nxdomain, error handling | |
28 | -- todo: cache results of encodeName | |
29 | ||
30 | ||
31 | -- reference: http://tools.ietf.org/html/rfc1035 | |
32 | -- reference: http://tools.ietf.org/html/rfc1876 (LOC) | |
33 | ||
34 | ||
35 | require 'socket' | |
36 | local ztact = require 'util.ztact' | |
37 | ||
38 | ||
39 | local coroutine, io, math, socket, string, table = | |
40 | coroutine, io, math, socket, string, table | |
41 | ||
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42 | local ipairs, next, pairs, print, setmetatable, tostring, assert, error = |
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43 | ipairs, next, pairs, print, setmetatable, tostring, assert, error |
337 | 44 | |
45 | local get, set = ztact.get, ztact.set | |
46 | ||
47 | ||
48 | -------------------------------------------------- module dns | |
49 | module ('dns') | |
50 | local dns = _M; | |
51 | ||
52 | ||
53 | -- dns type & class codes ------------------------------ dns type & class codes | |
54 | ||
55 | ||
56 | local append = table.insert | |
57 | ||
58 | ||
59 | local function highbyte (i) -- - - - - - - - - - - - - - - - - - - highbyte | |
60 | return (i-(i%0x100))/0x100 | |
61 | end | |
62 | ||
63 | ||
64 | local function augment (t) -- - - - - - - - - - - - - - - - - - - - augment | |
65 | local a = {} | |
66 | for i,s in pairs (t) do a[i] = s a[s] = s a[string.lower (s)] = s end | |
67 | return a | |
68 | end | |
69 | ||
70 | ||
71 | local function encode (t) -- - - - - - - - - - - - - - - - - - - - - encode | |
72 | local code = {} | |
73 | for i,s in pairs (t) do | |
74 | local word = string.char (highbyte (i), i %0x100) | |
75 | code[i] = word | |
76 | code[s] = word | |
77 | code[string.lower (s)] = word | |
78 | end | |
79 | return code | |
80 | end | |
81 | ||
82 | ||
83 | dns.types = { | |
84 | 'A', 'NS', 'MD', 'MF', 'CNAME', 'SOA', 'MB', 'MG', 'MR', 'NULL', 'WKS', | |
85 | 'PTR', 'HINFO', 'MINFO', 'MX', 'TXT', | |
86 | [ 28] = 'AAAA', [ 29] = 'LOC', [ 33] = 'SRV', | |
87 | [252] = 'AXFR', [253] = 'MAILB', [254] = 'MAILA', [255] = '*' } | |
88 | ||
89 | ||
90 | dns.classes = { 'IN', 'CS', 'CH', 'HS', [255] = '*' } | |
91 | ||
92 | ||
93 | dns.type = augment (dns.types) | |
94 | dns.class = augment (dns.classes) | |
95 | dns.typecode = encode (dns.types) | |
96 | dns.classcode = encode (dns.classes) | |
97 | ||
98 | ||
99 | ||
100 | local function standardize (qname, qtype, qclass) -- - - - - - - standardize | |
101 | if string.byte (qname, -1) ~= 0x2E then qname = qname..'.' end | |
102 | qname = string.lower (qname) | |
103 | return qname, dns.type[qtype or 'A'], dns.class[qclass or 'IN'] | |
104 | end | |
105 | ||
106 | ||
107 | local function prune (rrs, time, soft) -- - - - - - - - - - - - - - - prune | |
108 | ||
109 | time = time or socket.gettime () | |
110 | for i,rr in pairs (rrs) do | |
111 | ||
112 | if rr.tod then | |
113 | -- rr.tod = rr.tod - 50 -- accelerated decripitude | |
114 | rr.ttl = math.floor (rr.tod - time) | |
115 | if rr.ttl <= 0 then rrs[i] = nil end | |
116 | ||
117 | elseif soft == 'soft' then -- What is this? I forget! | |
118 | assert (rr.ttl == 0) | |
119 | rrs[i] = nil | |
120 | end end end | |
121 | ||
122 | ||
123 | -- metatables & co. ------------------------------------------ metatables & co. | |
124 | ||
125 | ||
126 | local resolver = {} | |
127 | resolver.__index = resolver | |
128 | ||
129 | ||
130 | local SRV_tostring | |
131 | ||
132 | ||
133 | local rr_metatable = {} -- - - - - - - - - - - - - - - - - - - rr_metatable | |
134 | function rr_metatable.__tostring (rr) | |
135 | local s0 = string.format ( | |
136 | '%2s %-5s %6i %-28s', rr.class, rr.type, rr.ttl, rr.name ) | |
137 | local s1 = '' | |
138 | if rr.type == 'A' then s1 = ' '..rr.a | |
139 | elseif rr.type == 'MX' then | |
140 | s1 = string.format (' %2i %s', rr.pref, rr.mx) | |
141 | elseif rr.type == 'CNAME' then s1 = ' '..rr.cname | |
142 | elseif rr.type == 'LOC' then s1 = ' '..resolver.LOC_tostring (rr) | |
143 | elseif rr.type == 'NS' then s1 = ' '..rr.ns | |
144 | elseif rr.type == 'SRV' then s1 = ' '..SRV_tostring (rr) | |
145 | elseif rr.type == 'TXT' then s1 = ' '..rr.txt | |
146 | else s1 = ' <UNKNOWN RDATA TYPE>' end | |
147 | return s0..s1 | |
148 | end | |
149 | ||
150 | ||
151 | local rrs_metatable = {} -- - - - - - - - - - - - - - - - - - rrs_metatable | |
152 | function rrs_metatable.__tostring (rrs) | |
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153 | local t = {} |
337 | 154 | for i,rr in pairs (rrs) do append (t, tostring (rr)..'\n') end |
155 | return table.concat (t) | |
156 | end | |
157 | ||
158 | ||
159 | local cache_metatable = {} -- - - - - - - - - - - - - - - - cache_metatable | |
160 | function cache_metatable.__tostring (cache) | |
161 | local time = socket.gettime () | |
162 | local t = {} | |
163 | for class,types in pairs (cache) do | |
164 | for type,names in pairs (types) do | |
165 | for name,rrs in pairs (names) do | |
166 | prune (rrs, time) | |
167 | append (t, tostring (rrs)) end end end | |
168 | return table.concat (t) | |
169 | end | |
170 | ||
171 | ||
172 | function resolver:new () -- - - - - - - - - - - - - - - - - - - - - resolver | |
173 | local r = { active = {}, cache = {}, unsorted = {} } | |
174 | setmetatable (r, resolver) | |
175 | setmetatable (r.cache, cache_metatable) | |
176 | setmetatable (r.unsorted, { __mode = 'kv' }) | |
177 | return r | |
178 | end | |
179 | ||
180 | ||
181 | -- packet layer -------------------------------------------------- packet layer | |
182 | ||
183 | ||
184 | function dns.random (...) -- - - - - - - - - - - - - - - - - - - dns.random | |
185 | math.randomseed (10000*socket.gettime ()) | |
186 | dns.random = math.random | |
187 | return dns.random (...) | |
188 | end | |
189 | ||
190 | ||
191 | local function encodeHeader (o) -- - - - - - - - - - - - - - - encodeHeader | |
192 | ||
193 | o = o or {} | |
194 | ||
195 | o.id = o.id or -- 16b (random) id | |
196 | dns.random (0, 0xffff) | |
197 | ||
198 | o.rd = o.rd or 1 -- 1b 1 recursion desired | |
199 | o.tc = o.tc or 0 -- 1b 1 truncated response | |
200 | o.aa = o.aa or 0 -- 1b 1 authoritative response | |
201 | o.opcode = o.opcode or 0 -- 4b 0 query | |
202 | -- 1 inverse query | |
203 | -- 2 server status request | |
204 | -- 3-15 reserved | |
205 | o.qr = o.qr or 0 -- 1b 0 query, 1 response | |
206 | ||
207 | o.rcode = o.rcode or 0 -- 4b 0 no error | |
208 | -- 1 format error | |
209 | -- 2 server failure | |
210 | -- 3 name error | |
211 | -- 4 not implemented | |
212 | -- 5 refused | |
213 | -- 6-15 reserved | |
214 | o.z = o.z or 0 -- 3b 0 resvered | |
215 | o.ra = o.ra or 0 -- 1b 1 recursion available | |
216 | ||
217 | o.qdcount = o.qdcount or 1 -- 16b number of question RRs | |
218 | o.ancount = o.ancount or 0 -- 16b number of answers RRs | |
219 | o.nscount = o.nscount or 0 -- 16b number of nameservers RRs | |
220 | o.arcount = o.arcount or 0 -- 16b number of additional RRs | |
221 | ||
222 | -- string.char() rounds, so prevent roundup with -0.4999 | |
223 | local header = string.char ( | |
224 | highbyte (o.id), o.id %0x100, | |
225 | o.rd + 2*o.tc + 4*o.aa + 8*o.opcode + 128*o.qr, | |
226 | o.rcode + 16*o.z + 128*o.ra, | |
227 | highbyte (o.qdcount), o.qdcount %0x100, | |
228 | highbyte (o.ancount), o.ancount %0x100, | |
229 | highbyte (o.nscount), o.nscount %0x100, | |
230 | highbyte (o.arcount), o.arcount %0x100 ) | |
231 | ||
232 | return header, o.id | |
233 | end | |
234 | ||
235 | ||
236 | local function encodeName (name) -- - - - - - - - - - - - - - - - encodeName | |
237 | local t = {} | |
238 | for part in string.gmatch (name, '[^.]+') do | |
239 | append (t, string.char (string.len (part))) | |
240 | append (t, part) | |
241 | end | |
242 | append (t, string.char (0)) | |
243 | return table.concat (t) | |
244 | end | |
245 | ||
246 | ||
247 | local function encodeQuestion (qname, qtype, qclass) -- - - - encodeQuestion | |
248 | qname = encodeName (qname) | |
249 | qtype = dns.typecode[qtype or 'a'] | |
250 | qclass = dns.classcode[qclass or 'in'] | |
251 | return qname..qtype..qclass; | |
252 | end | |
253 | ||
254 | ||
255 | function resolver:byte (len) -- - - - - - - - - - - - - - - - - - - - - byte | |
256 | len = len or 1 | |
257 | local offset = self.offset | |
258 | local last = offset + len - 1 | |
259 | if last > #self.packet then | |
260 | error (string.format ('out of bounds: %i>%i', last, #self.packet)) end | |
261 | self.offset = offset + len | |
262 | return string.byte (self.packet, offset, last) | |
263 | end | |
264 | ||
265 | ||
266 | function resolver:word () -- - - - - - - - - - - - - - - - - - - - - - word | |
267 | local b1, b2 = self:byte (2) | |
268 | return 0x100*b1 + b2 | |
269 | end | |
270 | ||
271 | ||
272 | function resolver:dword () -- - - - - - - - - - - - - - - - - - - - - dword | |
273 | local b1, b2, b3, b4 = self:byte (4) | |
274 | -- print ('dword', b1, b2, b3, b4) | |
275 | return 0x1000000*b1 + 0x10000*b2 + 0x100*b3 + b4 | |
276 | end | |
277 | ||
278 | ||
279 | function resolver:sub (len) -- - - - - - - - - - - - - - - - - - - - - - sub | |
280 | len = len or 1 | |
281 | local s = string.sub (self.packet, self.offset, self.offset + len - 1) | |
282 | self.offset = self.offset + len | |
283 | return s | |
284 | end | |
285 | ||
286 | ||
287 | function resolver:header (force) -- - - - - - - - - - - - - - - - - - header | |
288 | ||
289 | local id = self:word () | |
290 | -- print (string.format (':header id %x', id)) | |
291 | if not self.active[id] and not force then return nil end | |
292 | ||
293 | local h = { id = id } | |
294 | ||
295 | local b1, b2 = self:byte (2) | |
296 | ||
297 | h.rd = b1 %2 | |
298 | h.tc = b1 /2%2 | |
299 | h.aa = b1 /4%2 | |
300 | h.opcode = b1 /8%16 | |
301 | h.qr = b1 /128 | |
302 | ||
303 | h.rcode = b2 %16 | |
304 | h.z = b2 /16%8 | |
305 | h.ra = b2 /128 | |
306 | ||
307 | h.qdcount = self:word () | |
308 | h.ancount = self:word () | |
309 | h.nscount = self:word () | |
310 | h.arcount = self:word () | |
311 | ||
312 | for k,v in pairs (h) do h[k] = v-v%1 end | |
313 | ||
314 | return h | |
315 | end | |
316 | ||
317 | ||
318 | function resolver:name () -- - - - - - - - - - - - - - - - - - - - - - name | |
319 | local remember, pointers = nil, 0 | |
320 | local len = self:byte () | |
321 | local n = {} | |
322 | while len > 0 do | |
323 | if len >= 0xc0 then -- name is "compressed" | |
324 | pointers = pointers + 1 | |
325 | if pointers >= 20 then error ('dns error: 20 pointers') end | |
326 | local offset = ((len-0xc0)*0x100) + self:byte () | |
327 | remember = remember or self.offset | |
328 | self.offset = offset + 1 -- +1 for lua | |
329 | else -- name is not compressed | |
330 | append (n, self:sub (len)..'.') | |
331 | end | |
332 | len = self:byte () | |
333 | end | |
334 | self.offset = remember or self.offset | |
335 | return table.concat (n) | |
336 | end | |
337 | ||
338 | ||
339 | function resolver:question () -- - - - - - - - - - - - - - - - - - question | |
340 | local q = {} | |
341 | q.name = self:name () | |
342 | q.type = dns.type[self:word ()] | |
343 | q.class = dns.type[self:word ()] | |
344 | return q | |
345 | end | |
346 | ||
347 | ||
348 | function resolver:A (rr) -- - - - - - - - - - - - - - - - - - - - - - - - A | |
349 | local b1, b2, b3, b4 = self:byte (4) | |
350 | rr.a = string.format ('%i.%i.%i.%i', b1, b2, b3, b4) | |
351 | end | |
352 | ||
353 | ||
354 | function resolver:CNAME (rr) -- - - - - - - - - - - - - - - - - - - - CNAME | |
355 | rr.cname = self:name () | |
356 | end | |
357 | ||
358 | ||
359 | function resolver:MX (rr) -- - - - - - - - - - - - - - - - - - - - - - - MX | |
360 | rr.pref = self:word () | |
361 | rr.mx = self:name () | |
362 | end | |
363 | ||
364 | ||
365 | function resolver:LOC_nibble_power () -- - - - - - - - - - LOC_nibble_power | |
366 | local b = self:byte () | |
367 | -- print ('nibbles', ((b-(b%0x10))/0x10), (b%0x10)) | |
368 | return ((b-(b%0x10))/0x10) * (10^(b%0x10)) | |
369 | end | |
370 | ||
371 | ||
372 | function resolver:LOC (rr) -- - - - - - - - - - - - - - - - - - - - - - LOC | |
373 | rr.version = self:byte () | |
374 | if rr.version == 0 then | |
375 | rr.loc = rr.loc or {} | |
376 | rr.loc.size = self:LOC_nibble_power () | |
377 | rr.loc.horiz_pre = self:LOC_nibble_power () | |
378 | rr.loc.vert_pre = self:LOC_nibble_power () | |
379 | rr.loc.latitude = self:dword () | |
380 | rr.loc.longitude = self:dword () | |
381 | rr.loc.altitude = self:dword () | |
382 | end end | |
383 | ||
384 | ||
385 | local function LOC_tostring_degrees (f, pos, neg) -- - - - - - - - - - - - - | |
386 | f = f - 0x80000000 | |
387 | if f < 0 then pos = neg f = -f end | |
388 | local deg, min, msec | |
389 | msec = f%60000 | |
390 | f = (f-msec)/60000 | |
391 | min = f%60 | |
392 | deg = (f-min)/60 | |
393 | return string.format ('%3d %2d %2.3f %s', deg, min, msec/1000, pos) | |
394 | end | |
395 | ||
396 | ||
397 | function resolver.LOC_tostring (rr) -- - - - - - - - - - - - - LOC_tostring | |
398 | ||
399 | local t = {} | |
400 | ||
401 | --[[ | |
402 | for k,name in pairs { 'size', 'horiz_pre', 'vert_pre', | |
403 | 'latitude', 'longitude', 'altitude' } do | |
404 | append (t, string.format ('%4s%-10s: %12.0f\n', '', name, rr.loc[name])) | |
405 | end | |
406 | --]] | |
407 | ||
408 | append ( t, string.format ( | |
409 | '%s %s %.2fm %.2fm %.2fm %.2fm', | |
410 | LOC_tostring_degrees (rr.loc.latitude, 'N', 'S'), | |
411 | LOC_tostring_degrees (rr.loc.longitude, 'E', 'W'), | |
412 | (rr.loc.altitude - 10000000) / 100, | |
413 | rr.loc.size / 100, | |
414 | rr.loc.horiz_pre / 100, | |
415 | rr.loc.vert_pre / 100 ) ) | |
416 | ||
417 | return table.concat (t) | |
418 | end | |
419 | ||
420 | ||
421 | function resolver:NS (rr) -- - - - - - - - - - - - - - - - - - - - - - - NS | |
422 | rr.ns = self:name () | |
423 | end | |
424 | ||
425 | ||
426 | function resolver:SOA (rr) -- - - - - - - - - - - - - - - - - - - - - - SOA | |
427 | end | |
428 | ||
429 | ||
430 | function resolver:SRV (rr) -- - - - - - - - - - - - - - - - - - - - - - SRV | |
431 | rr.srv = {} | |
432 | rr.srv.priority = self:word () | |
433 | rr.srv.weight = self:word () | |
434 | rr.srv.port = self:word () | |
435 | rr.srv.target = self:name () | |
436 | end | |
437 | ||
438 | ||
439 | function SRV_tostring (rr) -- - - - - - - - - - - - - - - - - - SRV_tostring | |
440 | local s = rr.srv | |
441 | return string.format ( '%5d %5d %5d %s', | |
442 | s.priority, s.weight, s.port, s.target ) | |
443 | end | |
444 | ||
445 | ||
446 | function resolver:TXT (rr) -- - - - - - - - - - - - - - - - - - - - - - TXT | |
447 | rr.txt = self:sub (rr.rdlength) | |
448 | end | |
449 | ||
450 | ||
451 | function resolver:rr () -- - - - - - - - - - - - - - - - - - - - - - - - rr | |
452 | local rr = {} | |
453 | setmetatable (rr, rr_metatable) | |
454 | rr.name = self:name (self) | |
455 | rr.type = dns.type[self:word ()] or rr.type | |
456 | rr.class = dns.class[self:word ()] or rr.class | |
457 | rr.ttl = 0x10000*self:word () + self:word () | |
458 | rr.rdlength = self:word () | |
459 | ||
460 | if rr.ttl == 0 then -- pass | |
461 | else rr.tod = self.time + rr.ttl end | |
462 | ||
463 | local remember = self.offset | |
464 | local rr_parser = self[dns.type[rr.type]] | |
465 | if rr_parser then rr_parser (self, rr) end | |
466 | self.offset = remember | |
467 | rr.rdata = self:sub (rr.rdlength) | |
468 | return rr | |
469 | end | |
470 | ||
471 | ||
472 | function resolver:rrs (count) -- - - - - - - - - - - - - - - - - - - - - rrs | |
473 | local rrs = {} | |
474 | for i = 1,count do append (rrs, self:rr ()) end | |
475 | return rrs | |
476 | end | |
477 | ||
478 | ||
479 | function resolver:decode (packet, force) -- - - - - - - - - - - - - - decode | |
480 | ||
481 | self.packet, self.offset = packet, 1 | |
482 | local header = self:header (force) | |
483 | if not header then return nil end | |
484 | local response = { header = header } | |
485 | ||
486 | response.question = {} | |
487 | local offset = self.offset | |
488 | for i = 1,response.header.qdcount do | |
489 | append (response.question, self:question ()) end | |
490 | response.question.raw = string.sub (self.packet, offset, self.offset - 1) | |
491 | ||
492 | if not force then | |
493 | if not self.active[response.header.id] or | |
494 | not self.active[response.header.id][response.question.raw] then | |
495 | return nil end end | |
496 | ||
497 | response.answer = self:rrs (response.header.ancount) | |
498 | response.authority = self:rrs (response.header.nscount) | |
499 | response.additional = self:rrs (response.header.arcount) | |
500 | ||
501 | return response | |
502 | end | |
503 | ||
504 | ||
505 | -- socket layer -------------------------------------------------- socket layer | |
506 | ||
507 | ||
508 | resolver.delays = { 1, 3, 11, 45 } | |
509 | ||
510 | ||
511 | function resolver:addnameserver (address) -- - - - - - - - - - addnameserver | |
512 | self.server = self.server or {} | |
513 | append (self.server, address) | |
514 | end | |
515 | ||
516 | ||
517 | function resolver:setnameserver (address) -- - - - - - - - - - setnameserver | |
518 | self.server = {} | |
519 | self:addnameserver (address) | |
520 | end | |
521 | ||
522 | ||
523 | function resolver:adddefaultnameservers () -- - - - - adddefaultnameservers | |
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524 | local resolv_conf = io.open("/etc/resolv.conf"); |
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525 | if resolv_conf then |
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526 | for line in resolv_conf:lines() do |
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527 | local address = string.match (line, 'nameserver%s+(%d+%.%d+%.%d+%.%d+)') |
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528 | if address then self:addnameserver (address) end |
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529 | end |
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530 | else -- FIXME correct for windows, using opendns nameservers for now |
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531 | self:addnameserver ("208.67.222.222") |
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532 | self:addnameserver ("208.67.220.220") |
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533 | end |
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534 | end |
337 | 535 | |
536 | ||
537 | function resolver:getsocket (servernum) -- - - - - - - - - - - - - getsocket | |
538 | ||
539 | self.socket = self.socket or {} | |
540 | self.socketset = self.socketset or {} | |
541 | ||
542 | local sock = self.socket[servernum] | |
543 | if sock then return sock end | |
544 | ||
545 | sock = socket.udp () | |
546 | if self.socket_wrapper then sock = self.socket_wrapper (sock) end | |
547 | sock:settimeout (0) | |
548 | -- todo: attempt to use a random port, fallback to 0 | |
549 | sock:setsockname ('*', 0) | |
550 | sock:setpeername (self.server[servernum], 53) | |
551 | self.socket[servernum] = sock | |
552 | self.socketset[sock] = sock | |
553 | return sock | |
554 | end | |
555 | ||
556 | ||
557 | function resolver:socket_wrapper_set (func) -- - - - - - - socket_wrapper_set | |
558 | self.socket_wrapper = func | |
559 | end | |
560 | ||
561 | ||
562 | function resolver:closeall () -- - - - - - - - - - - - - - - - - - closeall | |
563 | for i,sock in ipairs (self.socket) do self.socket[i]:close () end | |
564 | self.socket = {} | |
565 | end | |
566 | ||
567 | ||
568 | function resolver:remember (rr, type) -- - - - - - - - - - - - - - remember | |
569 | ||
570 | -- print ('remember', type, rr.class, rr.type, rr.name) | |
571 | ||
572 | if type ~= '*' then | |
573 | type = rr.type | |
574 | local all = get (self.cache, rr.class, '*', rr.name) | |
575 | -- print ('remember all', all) | |
576 | if all then append (all, rr) end | |
577 | end | |
578 | ||
579 | self.cache = self.cache or setmetatable ({}, cache_metatable) | |
580 | local rrs = get (self.cache, rr.class, type, rr.name) or | |
581 | set (self.cache, rr.class, type, rr.name, setmetatable ({}, rrs_metatable)) | |
582 | append (rrs, rr) | |
583 | ||
584 | if type == 'MX' then self.unsorted[rrs] = true end | |
585 | end | |
586 | ||
587 | ||
588 | local function comp_mx (a, b) -- - - - - - - - - - - - - - - - - - - comp_mx | |
589 | return (a.pref == b.pref) and (a.mx < b.mx) or (a.pref < b.pref) | |
590 | end | |
591 | ||
592 | ||
593 | function resolver:peek (qname, qtype, qclass) -- - - - - - - - - - - - peek | |
594 | qname, qtype, qclass = standardize (qname, qtype, qclass) | |
595 | local rrs = get (self.cache, qclass, qtype, qname) | |
596 | if not rrs then return nil end | |
597 | if prune (rrs, socket.gettime ()) and qtype == '*' or not next (rrs) then | |
598 | set (self.cache, qclass, qtype, qname, nil) return nil end | |
599 | if self.unsorted[rrs] then table.sort (rrs, comp_mx) end | |
600 | return rrs | |
601 | end | |
602 | ||
603 | ||
604 | function resolver:purge (soft) -- - - - - - - - - - - - - - - - - - - purge | |
605 | if soft == 'soft' then | |
606 | self.time = socket.gettime () | |
607 | for class,types in pairs (self.cache or {}) do | |
608 | for type,names in pairs (types) do | |
609 | for name,rrs in pairs (names) do | |
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610 | prune (rrs, self.time, 'soft') |
337 | 611 | end end end |
612 | else self.cache = {} end | |
613 | end | |
614 | ||
615 | ||
616 | function resolver:query (qname, qtype, qclass) -- - - - - - - - - - -- query | |
617 | ||
618 | qname, qtype, qclass = standardize (qname, qtype, qclass) | |
619 | ||
620 | if not self.server then self:adddefaultnameservers () end | |
621 | ||
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622 | local question = encodeQuestion (qname, qtype, qclass) |
337 | 623 | local peek = self:peek (qname, qtype, qclass) |
624 | if peek then return peek end | |
625 | ||
626 | local header, id = encodeHeader () | |
627 | -- print ('query id', id, qclass, qtype, qname) | |
628 | local o = { packet = header..question, | |
629 | server = 1, | |
630 | delay = 1, | |
631 | retry = socket.gettime () + self.delays[1] } | |
632 | self:getsocket (o.server):send (o.packet) | |
633 | ||
634 | -- remember the query | |
635 | self.active[id] = self.active[id] or {} | |
636 | self.active[id][question] = o | |
637 | ||
638 | -- remember which coroutine wants the answer | |
639 | local co = coroutine.running () | |
640 | if co then | |
641 | set (self.wanted, qclass, qtype, qname, co, true) | |
642 | set (self.yielded, co, qclass, qtype, qname, true) | |
643 | end end | |
644 | ||
645 | ||
646 | function resolver:receive (rset) -- - - - - - - - - - - - - - - - - receive | |
647 | ||
648 | -- print 'receive' print (self.socket) | |
649 | self.time = socket.gettime () | |
650 | rset = rset or self.socket | |
651 | ||
652 | local response | |
653 | for i,sock in pairs (rset) do | |
654 | ||
655 | if self.socketset[sock] then | |
656 | local packet = sock:receive () | |
657 | if packet then | |
658 | ||
659 | response = self:decode (packet) | |
660 | if response then | |
661 | -- print 'received response' | |
662 | -- self.print (response) | |
663 | ||
664 | for i,section in pairs { 'answer', 'authority', 'additional' } do | |
665 | for j,rr in pairs (response[section]) do | |
666 | self:remember (rr, response.question[1].type) end end | |
667 | ||
668 | -- retire the query | |
669 | local queries = self.active[response.header.id] | |
670 | if queries[response.question.raw] then | |
671 | queries[response.question.raw] = nil end | |
672 | if not next (queries) then self.active[response.header.id] = nil end | |
673 | if not next (self.active) then self:closeall () end | |
674 | ||
675 | -- was the query on the wanted list? | |
676 | local q = response.question | |
677 | local cos = get (self.wanted, q.class, q.type, q.name) | |
678 | if cos then | |
679 | for co in pairs (cos) do | |
680 | set (self.yielded, co, q.class, q.type, q.name, nil) | |
681 | if not self.yielded[co] then coroutine.resume (co) end | |
682 | end | |
683 | set (self.wanted, q.class, q.type, q.name, nil) | |
684 | end end end end end | |
685 | ||
686 | return response | |
687 | end | |
688 | ||
689 | ||
690 | function resolver:pulse () -- - - - - - - - - - - - - - - - - - - - - pulse | |
691 | ||
692 | -- print ':pulse' | |
693 | while self:receive () do end | |
694 | if not next (self.active) then return nil end | |
695 | ||
696 | self.time = socket.gettime () | |
697 | for id,queries in pairs (self.active) do | |
698 | for question,o in pairs (queries) do | |
699 | if self.time >= o.retry then | |
700 | ||
701 | o.server = o.server + 1 | |
702 | if o.server > #self.server then | |
703 | o.server = 1 | |
704 | o.delay = o.delay + 1 | |
705 | end | |
706 | ||
707 | if o.delay > #self.delays then | |
708 | print ('timeout') | |
709 | queries[question] = nil | |
710 | if not next (queries) then self.active[id] = nil end | |
711 | if not next (self.active) then return nil end | |
712 | else | |
713 | -- print ('retry', o.server, o.delay) | |
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714 | local _a = self.socket[o.server]; |
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715 | if _a then _a:send (o.packet) end |
337 | 716 | o.retry = self.time + self.delays[o.delay] |
717 | end end end end | |
718 | ||
719 | if next (self.active) then return true end | |
720 | return nil | |
721 | end | |
722 | ||
723 | ||
724 | function resolver:lookup (qname, qtype, qclass) -- - - - - - - - - - lookup | |
725 | self:query (qname, qtype, qclass) | |
726 | while self:pulse () do socket.select (self.socket, nil, 4) end | |
727 | -- print (self.cache) | |
728 | return self:peek (qname, qtype, qclass) | |
729 | end | |
730 | ||
731 | ||
732 | -- print ---------------------------------------------------------------- print | |
733 | ||
734 | ||
735 | local hints = { -- - - - - - - - - - - - - - - - - - - - - - - - - - - hints | |
736 | qr = { [0]='query', 'response' }, | |
737 | opcode = { [0]='query', 'inverse query', 'server status request' }, | |
738 | aa = { [0]='non-authoritative', 'authoritative' }, | |
739 | tc = { [0]='complete', 'truncated' }, | |
740 | rd = { [0]='recursion not desired', 'recursion desired' }, | |
741 | ra = { [0]='recursion not available', 'recursion available' }, | |
742 | z = { [0]='(reserved)' }, | |
743 | rcode = { [0]='no error', 'format error', 'server failure', 'name error', | |
744 | 'not implemented' }, | |
745 | ||
746 | type = dns.type, | |
747 | class = dns.class, } | |
748 | ||
749 | ||
750 | local function hint (p, s) -- - - - - - - - - - - - - - - - - - - - - - hint | |
751 | return (hints[s] and hints[s][p[s]]) or '' end | |
752 | ||
753 | ||
754 | function resolver.print (response) -- - - - - - - - - - - - - resolver.print | |
755 | ||
756 | for s,s in pairs { 'id', 'qr', 'opcode', 'aa', 'tc', 'rd', 'ra', 'z', | |
757 | 'rcode', 'qdcount', 'ancount', 'nscount', 'arcount' } do | |
758 | print ( string.format ('%-30s', 'header.'..s), | |
759 | response.header[s], hint (response.header, s) ) | |
760 | end | |
761 | ||
762 | for i,question in ipairs (response.question) do | |
763 | print (string.format ('question[%i].name ', i), question.name) | |
764 | print (string.format ('question[%i].type ', i), question.type) | |
765 | print (string.format ('question[%i].class ', i), question.class) | |
766 | end | |
767 | ||
768 | local common = { name=1, type=1, class=1, ttl=1, rdlength=1, rdata=1 } | |
769 | local tmp | |
770 | for s,s in pairs {'answer', 'authority', 'additional'} do | |
771 | for i,rr in pairs (response[s]) do | |
772 | for j,t in pairs { 'name', 'type', 'class', 'ttl', 'rdlength' } do | |
773 | tmp = string.format ('%s[%i].%s', s, i, t) | |
774 | print (string.format ('%-30s', tmp), rr[t], hint (rr, t)) | |
775 | end | |
776 | for j,t in pairs (rr) do | |
777 | if not common[j] then | |
778 | tmp = string.format ('%s[%i].%s', s, i, j) | |
779 | print (string.format ('%-30s %s', tmp, t)) | |
780 | end end end end end | |
781 | ||
782 | ||
783 | -- module api ------------------------------------------------------ module api | |
784 | ||
785 | ||
786 | local function resolve (func, ...) -- - - - - - - - - - - - - - resolver_get | |
787 | dns._resolver = dns._resolver or dns.resolver () | |
788 | return func (dns._resolver, ...) | |
789 | end | |
790 | ||
791 | ||
792 | function dns.resolver () -- - - - - - - - - - - - - - - - - - - - - resolver | |
793 | ||
794 | -- this function seems to be redundant with resolver.new () | |
795 | ||
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796 | local r = { active = {}, cache = {}, unsorted = {}, wanted = {}, yielded = {} } |
337 | 797 | setmetatable (r, resolver) |
798 | setmetatable (r.cache, cache_metatable) | |
799 | setmetatable (r.unsorted, { __mode = 'kv' }) | |
800 | return r | |
801 | end | |
802 | ||
803 | ||
804 | function dns.lookup (...) -- - - - - - - - - - - - - - - - - - - - - lookup | |
805 | return resolve (resolver.lookup, ...) end | |
806 | ||
807 | ||
808 | function dns.purge (...) -- - - - - - - - - - - - - - - - - - - - - - purge | |
809 | return resolve (resolver.purge, ...) end | |
810 | ||
811 | function dns.peek (...) -- - - - - - - - - - - - - - - - - - - - - - - peek | |
812 | return resolve (resolver.peek, ...) end | |
813 | ||
814 | ||
815 | function dns.query (...) -- - - - - - - - - - - - - - - - - - - - - - query | |
816 | return resolve (resolver.query, ...) end | |
817 | ||
818 | ||
819 | function dns:socket_wrapper_set (...) -- - - - - - - - - socket_wrapper_set | |
820 | return resolve (resolver.socket_wrapper_set, ...) end | |
821 | ||
822 | ||
823 | return dns |