author | Waqas Hussain <waqas20@gmail.com> |
Mon, 02 Nov 2009 00:52:35 +0500 | |
changeset 2068 | 1e1ee53d7f6e |
parent 2067 | 0ed6369605bf |
child 2069 | 72357b1c6d88 |
permissions | -rw-r--r-- |
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 |
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6 |
||
7 |
||
8 |
-- todo: quick (default) header generation |
|
9 |
-- todo: nxdomain, error handling |
|
10 |
-- todo: cache results of encodeName |
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11 |
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12 |
||
13 |
-- reference: http://tools.ietf.org/html/rfc1035 |
|
14 |
-- reference: http://tools.ietf.org/html/rfc1876 (LOC) |
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15 |
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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 |
2067
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
20 |
local _, windows = pcall(require, "util.windows"); |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
21 |
local is_windows = (_ and windows) or os.getenv("WINDIR"); |
337 | 22 |
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23 |
local coroutine, io, math, socket, string, table = |
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24 |
coroutine, io, math, socket, string, table |
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25 |
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1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
26 |
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:
896
diff
changeset
|
27 |
ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack |
337 | 28 |
|
29 |
local get, set = ztact.get, ztact.set |
|
30 |
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31 |
||
32 |
-------------------------------------------------- module dns |
|
33 |
module ('dns') |
|
34 |
local dns = _M; |
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35 |
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36 |
||
37 |
-- dns type & class codes ------------------------------ dns type & class codes |
|
38 |
||
39 |
||
40 |
local append = table.insert |
|
41 |
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42 |
||
43 |
local function highbyte (i) -- - - - - - - - - - - - - - - - - - - highbyte |
|
44 |
return (i-(i%0x100))/0x100 |
|
45 |
end |
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46 |
||
47 |
||
48 |
local function augment (t) -- - - - - - - - - - - - - - - - - - - - augment |
|
49 |
local a = {} |
|
50 |
for i,s in pairs (t) do a[i] = s a[s] = s a[string.lower (s)] = s end |
|
51 |
return a |
|
52 |
end |
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53 |
||
54 |
||
55 |
local function encode (t) -- - - - - - - - - - - - - - - - - - - - - encode |
|
56 |
local code = {} |
|
57 |
for i,s in pairs (t) do |
|
58 |
local word = string.char (highbyte (i), i %0x100) |
|
59 |
code[i] = word |
|
60 |
code[s] = word |
|
61 |
code[string.lower (s)] = word |
|
62 |
end |
|
63 |
return code |
|
64 |
end |
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65 |
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66 |
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dns.types = { |
|
68 |
'A', 'NS', 'MD', 'MF', 'CNAME', 'SOA', 'MB', 'MG', 'MR', 'NULL', 'WKS', |
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'PTR', 'HINFO', 'MINFO', 'MX', 'TXT', |
|
70 |
[ 28] = 'AAAA', [ 29] = 'LOC', [ 33] = 'SRV', |
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71 |
[252] = 'AXFR', [253] = 'MAILB', [254] = 'MAILA', [255] = '*' } |
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72 |
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73 |
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74 |
dns.classes = { 'IN', 'CS', 'CH', 'HS', [255] = '*' } |
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75 |
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76 |
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77 |
dns.type = augment (dns.types) |
|
78 |
dns.class = augment (dns.classes) |
|
79 |
dns.typecode = encode (dns.types) |
|
80 |
dns.classcode = encode (dns.classes) |
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81 |
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82 |
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83 |
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84 |
local function standardize (qname, qtype, qclass) -- - - - - - - standardize |
|
85 |
if string.byte (qname, -1) ~= 0x2E then qname = qname..'.' end |
|
86 |
qname = string.lower (qname) |
|
87 |
return qname, dns.type[qtype or 'A'], dns.class[qclass or 'IN'] |
|
88 |
end |
|
89 |
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90 |
||
91 |
local function prune (rrs, time, soft) -- - - - - - - - - - - - - - - prune |
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92 |
||
93 |
time = time or socket.gettime () |
|
94 |
for i,rr in pairs (rrs) do |
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95 |
||
96 |
if rr.tod then |
|
97 |
-- rr.tod = rr.tod - 50 -- accelerated decripitude |
|
98 |
rr.ttl = math.floor (rr.tod - time) |
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1822
2f78ea5d0f11
net.dns: Remove elements from the cache when expired so as to not leave holes in the array
Matthew Wild <mwild1@gmail.com>
parents:
1820
diff
changeset
|
99 |
if rr.ttl <= 0 then |
2f78ea5d0f11
net.dns: Remove elements from the cache when expired so as to not leave holes in the array
Matthew Wild <mwild1@gmail.com>
parents:
1820
diff
changeset
|
100 |
table.remove(rrs, i); |
2f78ea5d0f11
net.dns: Remove elements from the cache when expired so as to not leave holes in the array
Matthew Wild <mwild1@gmail.com>
parents:
1820
diff
changeset
|
101 |
return prune(rrs, time, soft); -- Re-iterate |
2f78ea5d0f11
net.dns: Remove elements from the cache when expired so as to not leave holes in the array
Matthew Wild <mwild1@gmail.com>
parents:
1820
diff
changeset
|
102 |
end |
337 | 103 |
|
104 |
elseif soft == 'soft' then -- What is this? I forget! |
|
105 |
assert (rr.ttl == 0) |
|
106 |
rrs[i] = nil |
|
107 |
end end end |
|
108 |
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109 |
||
110 |
-- metatables & co. ------------------------------------------ metatables & co. |
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111 |
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112 |
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113 |
local resolver = {} |
|
114 |
resolver.__index = resolver |
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115 |
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116 |
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117 |
local SRV_tostring |
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118 |
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119 |
||
120 |
local rr_metatable = {} -- - - - - - - - - - - - - - - - - - - rr_metatable |
|
121 |
function rr_metatable.__tostring (rr) |
|
122 |
local s0 = string.format ( |
|
123 |
'%2s %-5s %6i %-28s', rr.class, rr.type, rr.ttl, rr.name ) |
|
124 |
local s1 = '' |
|
125 |
if rr.type == 'A' then s1 = ' '..rr.a |
|
126 |
elseif rr.type == 'MX' then |
|
127 |
s1 = string.format (' %2i %s', rr.pref, rr.mx) |
|
128 |
elseif rr.type == 'CNAME' then s1 = ' '..rr.cname |
|
129 |
elseif rr.type == 'LOC' then s1 = ' '..resolver.LOC_tostring (rr) |
|
130 |
elseif rr.type == 'NS' then s1 = ' '..rr.ns |
|
131 |
elseif rr.type == 'SRV' then s1 = ' '..SRV_tostring (rr) |
|
132 |
elseif rr.type == 'TXT' then s1 = ' '..rr.txt |
|
133 |
else s1 = ' <UNKNOWN RDATA TYPE>' end |
|
134 |
return s0..s1 |
|
135 |
end |
|
136 |
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137 |
||
138 |
local rrs_metatable = {} -- - - - - - - - - - - - - - - - - - rrs_metatable |
|
139 |
function rrs_metatable.__tostring (rrs) |
|
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
140 |
local t = {} |
337 | 141 |
for i,rr in pairs (rrs) do append (t, tostring (rr)..'\n') end |
142 |
return table.concat (t) |
|
143 |
end |
|
144 |
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145 |
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146 |
local cache_metatable = {} -- - - - - - - - - - - - - - - - cache_metatable |
|
147 |
function cache_metatable.__tostring (cache) |
|
148 |
local time = socket.gettime () |
|
149 |
local t = {} |
|
150 |
for class,types in pairs (cache) do |
|
151 |
for type,names in pairs (types) do |
|
152 |
for name,rrs in pairs (names) do |
|
153 |
prune (rrs, time) |
|
154 |
append (t, tostring (rrs)) end end end |
|
155 |
return table.concat (t) |
|
156 |
end |
|
157 |
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158 |
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159 |
function resolver:new () -- - - - - - - - - - - - - - - - - - - - - resolver |
|
160 |
local r = { active = {}, cache = {}, unsorted = {} } |
|
161 |
setmetatable (r, resolver) |
|
162 |
setmetatable (r.cache, cache_metatable) |
|
163 |
setmetatable (r.unsorted, { __mode = 'kv' }) |
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164 |
return r |
|
165 |
end |
|
166 |
||
167 |
||
168 |
-- packet layer -------------------------------------------------- packet layer |
|
169 |
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170 |
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171 |
function dns.random (...) -- - - - - - - - - - - - - - - - - - - dns.random |
|
172 |
math.randomseed (10000*socket.gettime ()) |
|
173 |
dns.random = math.random |
|
174 |
return dns.random (...) |
|
175 |
end |
|
176 |
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177 |
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178 |
local function encodeHeader (o) -- - - - - - - - - - - - - - - encodeHeader |
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179 |
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180 |
o = o or {} |
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181 |
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182 |
o.id = o.id or -- 16b (random) id |
|
183 |
dns.random (0, 0xffff) |
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184 |
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185 |
o.rd = o.rd or 1 -- 1b 1 recursion desired |
|
186 |
o.tc = o.tc or 0 -- 1b 1 truncated response |
|
187 |
o.aa = o.aa or 0 -- 1b 1 authoritative response |
|
188 |
o.opcode = o.opcode or 0 -- 4b 0 query |
|
189 |
-- 1 inverse query |
|
190 |
-- 2 server status request |
|
191 |
-- 3-15 reserved |
|
192 |
o.qr = o.qr or 0 -- 1b 0 query, 1 response |
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193 |
||
194 |
o.rcode = o.rcode or 0 -- 4b 0 no error |
|
195 |
-- 1 format error |
|
196 |
-- 2 server failure |
|
197 |
-- 3 name error |
|
198 |
-- 4 not implemented |
|
199 |
-- 5 refused |
|
200 |
-- 6-15 reserved |
|
201 |
o.z = o.z or 0 -- 3b 0 resvered |
|
202 |
o.ra = o.ra or 0 -- 1b 1 recursion available |
|
203 |
||
204 |
o.qdcount = o.qdcount or 1 -- 16b number of question RRs |
|
205 |
o.ancount = o.ancount or 0 -- 16b number of answers RRs |
|
206 |
o.nscount = o.nscount or 0 -- 16b number of nameservers RRs |
|
207 |
o.arcount = o.arcount or 0 -- 16b number of additional RRs |
|
208 |
||
209 |
-- string.char() rounds, so prevent roundup with -0.4999 |
|
210 |
local header = string.char ( |
|
211 |
highbyte (o.id), o.id %0x100, |
|
212 |
o.rd + 2*o.tc + 4*o.aa + 8*o.opcode + 128*o.qr, |
|
213 |
o.rcode + 16*o.z + 128*o.ra, |
|
214 |
highbyte (o.qdcount), o.qdcount %0x100, |
|
215 |
highbyte (o.ancount), o.ancount %0x100, |
|
216 |
highbyte (o.nscount), o.nscount %0x100, |
|
217 |
highbyte (o.arcount), o.arcount %0x100 ) |
|
218 |
||
219 |
return header, o.id |
|
220 |
end |
|
221 |
||
222 |
||
223 |
local function encodeName (name) -- - - - - - - - - - - - - - - - encodeName |
|
224 |
local t = {} |
|
225 |
for part in string.gmatch (name, '[^.]+') do |
|
226 |
append (t, string.char (string.len (part))) |
|
227 |
append (t, part) |
|
228 |
end |
|
229 |
append (t, string.char (0)) |
|
230 |
return table.concat (t) |
|
231 |
end |
|
232 |
||
233 |
||
234 |
local function encodeQuestion (qname, qtype, qclass) -- - - - encodeQuestion |
|
235 |
qname = encodeName (qname) |
|
236 |
qtype = dns.typecode[qtype or 'a'] |
|
237 |
qclass = dns.classcode[qclass or 'in'] |
|
238 |
return qname..qtype..qclass; |
|
239 |
end |
|
240 |
||
241 |
||
242 |
function resolver:byte (len) -- - - - - - - - - - - - - - - - - - - - - byte |
|
243 |
len = len or 1 |
|
244 |
local offset = self.offset |
|
245 |
local last = offset + len - 1 |
|
246 |
if last > #self.packet then |
|
247 |
error (string.format ('out of bounds: %i>%i', last, #self.packet)) end |
|
248 |
self.offset = offset + len |
|
249 |
return string.byte (self.packet, offset, last) |
|
250 |
end |
|
251 |
||
252 |
||
253 |
function resolver:word () -- - - - - - - - - - - - - - - - - - - - - - word |
|
254 |
local b1, b2 = self:byte (2) |
|
255 |
return 0x100*b1 + b2 |
|
256 |
end |
|
257 |
||
258 |
||
259 |
function resolver:dword () -- - - - - - - - - - - - - - - - - - - - - dword |
|
260 |
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
|
261 |
--print ('dword', b1, b2, b3, b4) |
337 | 262 |
return 0x1000000*b1 + 0x10000*b2 + 0x100*b3 + b4 |
263 |
end |
|
264 |
||
265 |
||
266 |
function resolver:sub (len) -- - - - - - - - - - - - - - - - - - - - - - sub |
|
267 |
len = len or 1 |
|
268 |
local s = string.sub (self.packet, self.offset, self.offset + len - 1) |
|
269 |
self.offset = self.offset + len |
|
270 |
return s |
|
271 |
end |
|
272 |
||
273 |
||
274 |
function resolver:header (force) -- - - - - - - - - - - - - - - - - - header |
|
275 |
||
276 |
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
|
277 |
--print (string.format (':header id %x', id)) |
337 | 278 |
if not self.active[id] and not force then return nil end |
279 |
||
280 |
local h = { id = id } |
|
281 |
||
282 |
local b1, b2 = self:byte (2) |
|
283 |
||
284 |
h.rd = b1 %2 |
|
285 |
h.tc = b1 /2%2 |
|
286 |
h.aa = b1 /4%2 |
|
287 |
h.opcode = b1 /8%16 |
|
288 |
h.qr = b1 /128 |
|
289 |
||
290 |
h.rcode = b2 %16 |
|
291 |
h.z = b2 /16%8 |
|
292 |
h.ra = b2 /128 |
|
293 |
||
294 |
h.qdcount = self:word () |
|
295 |
h.ancount = self:word () |
|
296 |
h.nscount = self:word () |
|
297 |
h.arcount = self:word () |
|
298 |
||
299 |
for k,v in pairs (h) do h[k] = v-v%1 end |
|
300 |
||
301 |
return h |
|
302 |
end |
|
303 |
||
304 |
||
305 |
function resolver:name () -- - - - - - - - - - - - - - - - - - - - - - name |
|
306 |
local remember, pointers = nil, 0 |
|
307 |
local len = self:byte () |
|
308 |
local n = {} |
|
309 |
while len > 0 do |
|
310 |
if len >= 0xc0 then -- name is "compressed" |
|
311 |
pointers = pointers + 1 |
|
312 |
if pointers >= 20 then error ('dns error: 20 pointers') end |
|
313 |
local offset = ((len-0xc0)*0x100) + self:byte () |
|
314 |
remember = remember or self.offset |
|
315 |
self.offset = offset + 1 -- +1 for lua |
|
316 |
else -- name is not compressed |
|
317 |
append (n, self:sub (len)..'.') |
|
318 |
end |
|
319 |
len = self:byte () |
|
320 |
end |
|
321 |
self.offset = remember or self.offset |
|
322 |
return table.concat (n) |
|
323 |
end |
|
324 |
||
325 |
||
326 |
function resolver:question () -- - - - - - - - - - - - - - - - - - question |
|
327 |
local q = {} |
|
328 |
q.name = self:name () |
|
329 |
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
|
330 |
q.class = dns.class[self:word ()] |
337 | 331 |
return q |
332 |
end |
|
333 |
||
334 |
||
335 |
function resolver:A (rr) -- - - - - - - - - - - - - - - - - - - - - - - - A |
|
336 |
local b1, b2, b3, b4 = self:byte (4) |
|
337 |
rr.a = string.format ('%i.%i.%i.%i', b1, b2, b3, b4) |
|
338 |
end |
|
339 |
||
340 |
||
341 |
function resolver:CNAME (rr) -- - - - - - - - - - - - - - - - - - - - CNAME |
|
342 |
rr.cname = self:name () |
|
343 |
end |
|
344 |
||
345 |
||
346 |
function resolver:MX (rr) -- - - - - - - - - - - - - - - - - - - - - - - MX |
|
347 |
rr.pref = self:word () |
|
348 |
rr.mx = self:name () |
|
349 |
end |
|
350 |
||
351 |
||
352 |
function resolver:LOC_nibble_power () -- - - - - - - - - - LOC_nibble_power |
|
353 |
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
|
354 |
--print ('nibbles', ((b-(b%0x10))/0x10), (b%0x10)) |
337 | 355 |
return ((b-(b%0x10))/0x10) * (10^(b%0x10)) |
356 |
end |
|
357 |
||
358 |
||
359 |
function resolver:LOC (rr) -- - - - - - - - - - - - - - - - - - - - - - LOC |
|
360 |
rr.version = self:byte () |
|
361 |
if rr.version == 0 then |
|
362 |
rr.loc = rr.loc or {} |
|
363 |
rr.loc.size = self:LOC_nibble_power () |
|
364 |
rr.loc.horiz_pre = self:LOC_nibble_power () |
|
365 |
rr.loc.vert_pre = self:LOC_nibble_power () |
|
366 |
rr.loc.latitude = self:dword () |
|
367 |
rr.loc.longitude = self:dword () |
|
368 |
rr.loc.altitude = self:dword () |
|
369 |
end end |
|
370 |
||
371 |
||
372 |
local function LOC_tostring_degrees (f, pos, neg) -- - - - - - - - - - - - - |
|
373 |
f = f - 0x80000000 |
|
374 |
if f < 0 then pos = neg f = -f end |
|
375 |
local deg, min, msec |
|
376 |
msec = f%60000 |
|
377 |
f = (f-msec)/60000 |
|
378 |
min = f%60 |
|
379 |
deg = (f-min)/60 |
|
380 |
return string.format ('%3d %2d %2.3f %s', deg, min, msec/1000, pos) |
|
381 |
end |
|
382 |
||
383 |
||
384 |
function resolver.LOC_tostring (rr) -- - - - - - - - - - - - - LOC_tostring |
|
385 |
||
386 |
local t = {} |
|
387 |
||
388 |
--[[ |
|
389 |
for k,name in pairs { 'size', 'horiz_pre', 'vert_pre', |
|
390 |
'latitude', 'longitude', 'altitude' } do |
|
391 |
append (t, string.format ('%4s%-10s: %12.0f\n', '', name, rr.loc[name])) |
|
392 |
end |
|
393 |
--]] |
|
394 |
||
395 |
append ( t, string.format ( |
|
396 |
'%s %s %.2fm %.2fm %.2fm %.2fm', |
|
397 |
LOC_tostring_degrees (rr.loc.latitude, 'N', 'S'), |
|
398 |
LOC_tostring_degrees (rr.loc.longitude, 'E', 'W'), |
|
399 |
(rr.loc.altitude - 10000000) / 100, |
|
400 |
rr.loc.size / 100, |
|
401 |
rr.loc.horiz_pre / 100, |
|
402 |
rr.loc.vert_pre / 100 ) ) |
|
403 |
||
404 |
return table.concat (t) |
|
405 |
end |
|
406 |
||
407 |
||
408 |
function resolver:NS (rr) -- - - - - - - - - - - - - - - - - - - - - - - NS |
|
409 |
rr.ns = self:name () |
|
410 |
end |
|
411 |
||
412 |
||
413 |
function resolver:SOA (rr) -- - - - - - - - - - - - - - - - - - - - - - SOA |
|
414 |
end |
|
415 |
||
416 |
||
417 |
function resolver:SRV (rr) -- - - - - - - - - - - - - - - - - - - - - - SRV |
|
418 |
rr.srv = {} |
|
419 |
rr.srv.priority = self:word () |
|
420 |
rr.srv.weight = self:word () |
|
421 |
rr.srv.port = self:word () |
|
422 |
rr.srv.target = self:name () |
|
423 |
end |
|
424 |
||
425 |
||
426 |
function SRV_tostring (rr) -- - - - - - - - - - - - - - - - - - SRV_tostring |
|
427 |
local s = rr.srv |
|
428 |
return string.format ( '%5d %5d %5d %s', |
|
429 |
s.priority, s.weight, s.port, s.target ) |
|
430 |
end |
|
431 |
||
432 |
||
433 |
function resolver:TXT (rr) -- - - - - - - - - - - - - - - - - - - - - - TXT |
|
434 |
rr.txt = self:sub (rr.rdlength) |
|
435 |
end |
|
436 |
||
437 |
||
438 |
function resolver:rr () -- - - - - - - - - - - - - - - - - - - - - - - - rr |
|
439 |
local rr = {} |
|
440 |
setmetatable (rr, rr_metatable) |
|
441 |
rr.name = self:name (self) |
|
442 |
rr.type = dns.type[self:word ()] or rr.type |
|
443 |
rr.class = dns.class[self:word ()] or rr.class |
|
444 |
rr.ttl = 0x10000*self:word () + self:word () |
|
445 |
rr.rdlength = self:word () |
|
446 |
||
2027
4cd673721e72
net.dns: Don't expire records with TTL of 0 instantly
Matthew Wild <mwild1@gmail.com>
parents:
1982
diff
changeset
|
447 |
if rr.ttl <= 0 then rr.tod = self.time + 30; |
337 | 448 |
else rr.tod = self.time + rr.ttl end |
449 |
||
450 |
local remember = self.offset |
|
451 |
local rr_parser = self[dns.type[rr.type]] |
|
452 |
if rr_parser then rr_parser (self, rr) end |
|
453 |
self.offset = remember |
|
454 |
rr.rdata = self:sub (rr.rdlength) |
|
455 |
return rr |
|
456 |
end |
|
457 |
||
458 |
||
459 |
function resolver:rrs (count) -- - - - - - - - - - - - - - - - - - - - - rrs |
|
460 |
local rrs = {} |
|
461 |
for i = 1,count do append (rrs, self:rr ()) end |
|
462 |
return rrs |
|
463 |
end |
|
464 |
||
465 |
||
466 |
function resolver:decode (packet, force) -- - - - - - - - - - - - - - decode |
|
467 |
||
468 |
self.packet, self.offset = packet, 1 |
|
469 |
local header = self:header (force) |
|
470 |
if not header then return nil end |
|
471 |
local response = { header = header } |
|
472 |
||
473 |
response.question = {} |
|
474 |
local offset = self.offset |
|
475 |
for i = 1,response.header.qdcount do |
|
476 |
append (response.question, self:question ()) end |
|
477 |
response.question.raw = string.sub (self.packet, offset, self.offset - 1) |
|
478 |
||
479 |
if not force then |
|
480 |
if not self.active[response.header.id] or |
|
481 |
not self.active[response.header.id][response.question.raw] then |
|
482 |
return nil end end |
|
483 |
||
484 |
response.answer = self:rrs (response.header.ancount) |
|
485 |
response.authority = self:rrs (response.header.nscount) |
|
486 |
response.additional = self:rrs (response.header.arcount) |
|
487 |
||
488 |
return response |
|
489 |
end |
|
490 |
||
491 |
||
492 |
-- socket layer -------------------------------------------------- socket layer |
|
493 |
||
494 |
||
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
|
495 |
resolver.delays = { 1, 3 } |
337 | 496 |
|
497 |
||
498 |
function resolver:addnameserver (address) -- - - - - - - - - - addnameserver |
|
499 |
self.server = self.server or {} |
|
500 |
append (self.server, address) |
|
501 |
end |
|
502 |
||
503 |
||
504 |
function resolver:setnameserver (address) -- - - - - - - - - - setnameserver |
|
505 |
self.server = {} |
|
506 |
self:addnameserver (address) |
|
507 |
end |
|
508 |
||
509 |
||
510 |
function resolver:adddefaultnameservers () -- - - - - adddefaultnameservers |
|
2067
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
511 |
if is_windows then |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
512 |
if windows then |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
513 |
for _, server in ipairs(windows.get_nameservers()) do |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
514 |
self:addnameserver(server) |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
515 |
end |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
516 |
end |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
517 |
if not self.server or #self.server == 0 then |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
518 |
-- TODO log warning about no nameservers, adding opendns servers as fallback |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
519 |
self:addnameserver("208.67.222.222") |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
520 |
self:addnameserver("208.67.220.220") |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
521 |
end |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
522 |
else -- posix |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
523 |
local resolv_conf = io.open("/etc/resolv.conf"); |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
524 |
if resolv_conf then |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
525 |
for line in resolv_conf:lines() do |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
526 |
local address = line:gsub("#.*$", ""):match('^%s*nameserver%s+(%d+%.%d+%.%d+%.%d+)%s*$') |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
527 |
if address then self:addnameserver (address) end |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
528 |
end |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
529 |
end |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
530 |
if not self.server or #self.server == 0 then |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
531 |
-- TODO log warning about no nameservers, adding localhost as the default nameserver |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
532 |
self:addnameserver("127.0.0.1"); |
0ed6369605bf
net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
parents:
2027
diff
changeset
|
533 |
end |
399
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
534 |
end |
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
535 |
end |
337 | 536 |
|
537 |
||
538 |
function resolver:getsocket (servernum) -- - - - - - - - - - - - - getsocket |
|
539 |
||
540 |
self.socket = self.socket or {} |
|
541 |
self.socketset = self.socketset or {} |
|
542 |
||
543 |
local sock = self.socket[servernum] |
|
544 |
if sock then return sock end |
|
545 |
||
546 |
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
|
547 |
if self.socket_wrapper then sock = self.socket_wrapper (sock, self) end |
337 | 548 |
sock:settimeout (0) |
549 |
-- todo: attempt to use a random port, fallback to 0 |
|
550 |
sock:setsockname ('*', 0) |
|
551 |
sock:setpeername (self.server[servernum], 53) |
|
552 |
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
|
553 |
self.socketset[sock] = servernum |
337 | 554 |
return sock |
555 |
end |
|
556 |
||
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
|
557 |
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
|
558 |
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
|
559 |
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
|
560 |
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
|
561 |
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
|
562 |
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
|
563 |
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
|
564 |
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
|
565 |
end |
337 | 566 |
|
567 |
function resolver:socket_wrapper_set (func) -- - - - - - - socket_wrapper_set |
|
568 |
self.socket_wrapper = func |
|
569 |
end |
|
570 |
||
571 |
||
572 |
function resolver:closeall () -- - - - - - - - - - - - - - - - - - closeall |
|
1949
e3d777d76b1a
net.dns: Remove sockets from socketset when closing them, fixes a leak
Matthew Wild <mwild1@gmail.com>
parents:
1827
diff
changeset
|
573 |
for i,sock in ipairs (self.socket) do |
e3d777d76b1a
net.dns: Remove sockets from socketset when closing them, fixes a leak
Matthew Wild <mwild1@gmail.com>
parents:
1827
diff
changeset
|
574 |
self.socket[i] = nil; |
e3d777d76b1a
net.dns: Remove sockets from socketset when closing them, fixes a leak
Matthew Wild <mwild1@gmail.com>
parents:
1827
diff
changeset
|
575 |
self.socketset[sock] = nil; |
e3d777d76b1a
net.dns: Remove sockets from socketset when closing them, fixes a leak
Matthew Wild <mwild1@gmail.com>
parents:
1827
diff
changeset
|
576 |
sock:close(); |
e3d777d76b1a
net.dns: Remove sockets from socketset when closing them, fixes a leak
Matthew Wild <mwild1@gmail.com>
parents:
1827
diff
changeset
|
577 |
end |
337 | 578 |
end |
579 |
||
580 |
||
581 |
function resolver:remember (rr, type) -- - - - - - - - - - - - - - remember |
|
582 |
||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
583 |
--print ('remember', type, rr.class, rr.type, rr.name) |
337 | 584 |
|
585 |
if type ~= '*' then |
|
586 |
type = rr.type |
|
587 |
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
|
588 |
--print ('remember all', all) |
337 | 589 |
if all then append (all, rr) end |
590 |
end |
|
591 |
||
592 |
self.cache = self.cache or setmetatable ({}, cache_metatable) |
|
593 |
local rrs = get (self.cache, rr.class, type, rr.name) or |
|
594 |
set (self.cache, rr.class, type, rr.name, setmetatable ({}, rrs_metatable)) |
|
595 |
append (rrs, rr) |
|
596 |
||
597 |
if type == 'MX' then self.unsorted[rrs] = true end |
|
598 |
end |
|
599 |
||
600 |
||
601 |
local function comp_mx (a, b) -- - - - - - - - - - - - - - - - - - - comp_mx |
|
602 |
return (a.pref == b.pref) and (a.mx < b.mx) or (a.pref < b.pref) |
|
603 |
end |
|
604 |
||
605 |
||
606 |
function resolver:peek (qname, qtype, qclass) -- - - - - - - - - - - - peek |
|
607 |
qname, qtype, qclass = standardize (qname, qtype, qclass) |
|
608 |
local rrs = get (self.cache, qclass, qtype, qname) |
|
609 |
if not rrs then return nil end |
|
610 |
if prune (rrs, socket.gettime ()) and qtype == '*' or not next (rrs) then |
|
611 |
set (self.cache, qclass, qtype, qname, nil) return nil end |
|
612 |
if self.unsorted[rrs] then table.sort (rrs, comp_mx) end |
|
613 |
return rrs |
|
614 |
end |
|
615 |
||
616 |
||
617 |
function resolver:purge (soft) -- - - - - - - - - - - - - - - - - - - purge |
|
618 |
if soft == 'soft' then |
|
619 |
self.time = socket.gettime () |
|
620 |
for class,types in pairs (self.cache or {}) do |
|
621 |
for type,names in pairs (types) do |
|
622 |
for name,rrs in pairs (names) do |
|
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
623 |
prune (rrs, self.time, 'soft') |
337 | 624 |
end end end |
625 |
else self.cache = {} end |
|
626 |
end |
|
627 |
||
628 |
||
629 |
function resolver:query (qname, qtype, qclass) -- - - - - - - - - - -- query |
|
630 |
||
631 |
qname, qtype, qclass = standardize (qname, qtype, qclass) |
|
632 |
||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
633 |
if not self.server then self:adddefaultnameservers () end |
337 | 634 |
|
379
c5617678cd7b
Fix various mistakes in dns.lua
Matthew Wild <mwild1@gmail.com>
parents:
378
diff
changeset
|
635 |
local question = encodeQuestion (qname, qtype, qclass) |
337 | 636 |
local peek = self:peek (qname, qtype, qclass) |
637 |
if peek then return peek end |
|
638 |
||
639 |
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
|
640 |
--print ('query id', id, qclass, qtype, qname) |
337 | 641 |
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
|
642 |
server = self.best_server, |
337 | 643 |
delay = 1, |
644 |
retry = socket.gettime () + self.delays[1] } |
|
645 |
||
646 |
-- remember the query |
|
647 |
self.active[id] = self.active[id] or {} |
|
648 |
self.active[id][question] = o |
|
649 |
||
650 |
-- remember which coroutine wants the answer |
|
651 |
local co = coroutine.running () |
|
652 |
if co then |
|
653 |
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
|
654 |
--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
|
655 |
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
|
656 |
|
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 |
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
|
658 |
|
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
659 |
end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
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 |
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
|
662 |
-- 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
|
663 |
|
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 |
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
|
665 |
|
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 |
-- 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
|
667 |
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
|
668 |
|
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 |
-- 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
|
670 |
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
|
671 |
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
|
672 |
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
|
673 |
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
|
674 |
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
|
675 |
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
|
676 |
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
|
677 |
end |
337 | 678 |
|
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
|
679 |
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
|
680 |
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
|
681 |
--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
|
682 |
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
|
683 |
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
|
684 |
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
|
685 |
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
|
686 |
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
|
687 |
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
|
688 |
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
|
689 |
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
|
690 |
|
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
|
691 |
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
|
692 |
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
|
693 |
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
|
694 |
-- 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
|
695 |
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
|
696 |
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
|
697 |
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
|
698 |
end |
337 | 699 |
|
700 |
function resolver:receive (rset) -- - - - - - - - - - - - - - - - - receive |
|
701 |
||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
702 |
--print 'receive' print (self.socket) |
337 | 703 |
self.time = socket.gettime () |
704 |
rset = rset or self.socket |
|
705 |
||
706 |
local response |
|
707 |
for i,sock in pairs (rset) do |
|
708 |
||
709 |
if self.socketset[sock] then |
|
710 |
local packet = sock:receive () |
|
711 |
if packet then |
|
712 |
||
713 |
response = self:decode (packet) |
|
714 |
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
|
715 |
--print 'received response' |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
716 |
--self.print (response) |
337 | 717 |
|
718 |
for i,section in pairs { 'answer', 'authority', 'additional' } do |
|
719 |
for j,rr in pairs (response[section]) do |
|
720 |
self:remember (rr, response.question[1].type) end end |
|
721 |
||
722 |
-- retire the query |
|
723 |
local queries = self.active[response.header.id] |
|
724 |
if queries[response.question.raw] then |
|
725 |
queries[response.question.raw] = nil end |
|
726 |
if not next (queries) then self.active[response.header.id] = nil end |
|
727 |
if not next (self.active) then self:closeall () end |
|
728 |
||
729 |
-- was the query on the wanted list? |
|
730 |
local q = response.question |
|
731 |
local cos = get (self.wanted, q.class, q.type, q.name) |
|
732 |
if cos then |
|
733 |
for co in pairs (cos) do |
|
734 |
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
|
735 |
if coroutine.status(co) == "suspended" then coroutine.resume (co) end |
337 | 736 |
end |
737 |
set (self.wanted, q.class, q.type, q.name, nil) |
|
738 |
end end end end end |
|
739 |
||
740 |
return response |
|
741 |
end |
|
742 |
||
743 |
||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
744 |
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
|
745 |
--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
|
746 |
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
|
747 |
|
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
748 |
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
|
749 |
if response then |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
750 |
--print 'received response' |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
751 |
--self.print (response) |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
752 |
|
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
753 |
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
|
754 |
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
|
755 |
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
|
756 |
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 |
|
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
759 |
-- retire the query |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
760 |
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
|
761 |
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
|
762 |
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
|
763 |
end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
764 |
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
|
765 |
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
|
766 |
|
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
767 |
-- 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
|
768 |
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
|
769 |
if q then |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
770 |
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
|
771 |
if cos then |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
772 |
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
|
773 |
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
|
774 |
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
|
775 |
end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
776 |
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
|
777 |
end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
778 |
end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
779 |
end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
780 |
|
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
781 |
return response |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
782 |
end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
783 |
|
1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
784 |
function resolver:cancel(data) |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
785 |
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:
896
diff
changeset
|
786 |
if cos then |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
787 |
cos[data[4]] = nil; |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
788 |
end |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
789 |
end |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
790 |
|
337 | 791 |
function resolver:pulse () -- - - - - - - - - - - - - - - - - - - - - pulse |
792 |
||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
793 |
--print ':pulse' |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
794 |
while self:receive() do end |
337 | 795 |
if not next (self.active) then return nil end |
796 |
||
797 |
self.time = socket.gettime () |
|
798 |
for id,queries in pairs (self.active) do |
|
799 |
for question,o in pairs (queries) do |
|
800 |
if self.time >= o.retry then |
|
801 |
||
802 |
o.server = o.server + 1 |
|
803 |
if o.server > #self.server then |
|
804 |
o.server = 1 |
|
805 |
o.delay = o.delay + 1 |
|
806 |
end |
|
807 |
||
808 |
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
|
809 |
--print ('timeout') |
337 | 810 |
queries[question] = nil |
811 |
if not next (queries) then self.active[id] = nil end |
|
812 |
if not next (self.active) then return nil end |
|
813 |
else |
|
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
814 |
--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
|
815 |
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
|
816 |
if _a then _a:send (o.packet) end |
337 | 817 |
o.retry = self.time + self.delays[o.delay] |
818 |
end end end end |
|
819 |
||
820 |
if next (self.active) then return true end |
|
821 |
return nil |
|
822 |
end |
|
823 |
||
824 |
||
825 |
function resolver:lookup (qname, qtype, qclass) -- - - - - - - - - - lookup |
|
826 |
self:query (qname, qtype, qclass) |
|
827 |
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
|
828 |
--print (self.cache) |
337 | 829 |
return self:peek (qname, qtype, qclass) |
830 |
end |
|
831 |
||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
832 |
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
|
833 |
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
|
834 |
end |
337 | 835 |
|
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
836 |
|
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
837 |
--print ---------------------------------------------------------------- print |
337 | 838 |
|
839 |
||
840 |
local hints = { -- - - - - - - - - - - - - - - - - - - - - - - - - - - hints |
|
841 |
qr = { [0]='query', 'response' }, |
|
842 |
opcode = { [0]='query', 'inverse query', 'server status request' }, |
|
843 |
aa = { [0]='non-authoritative', 'authoritative' }, |
|
844 |
tc = { [0]='complete', 'truncated' }, |
|
845 |
rd = { [0]='recursion not desired', 'recursion desired' }, |
|
846 |
ra = { [0]='recursion not available', 'recursion available' }, |
|
847 |
z = { [0]='(reserved)' }, |
|
848 |
rcode = { [0]='no error', 'format error', 'server failure', 'name error', |
|
849 |
'not implemented' }, |
|
850 |
||
851 |
type = dns.type, |
|
852 |
class = dns.class, } |
|
853 |
||
854 |
||
855 |
local function hint (p, s) -- - - - - - - - - - - - - - - - - - - - - - hint |
|
856 |
return (hints[s] and hints[s][p[s]]) or '' end |
|
857 |
||
858 |
||
859 |
function resolver.print (response) -- - - - - - - - - - - - - resolver.print |
|
860 |
||
861 |
for s,s in pairs { 'id', 'qr', 'opcode', 'aa', 'tc', 'rd', 'ra', 'z', |
|
862 |
'rcode', 'qdcount', 'ancount', 'nscount', 'arcount' } do |
|
863 |
print ( string.format ('%-30s', 'header.'..s), |
|
864 |
response.header[s], hint (response.header, s) ) |
|
865 |
end |
|
866 |
||
867 |
for i,question in ipairs (response.question) do |
|
868 |
print (string.format ('question[%i].name ', i), question.name) |
|
869 |
print (string.format ('question[%i].type ', i), question.type) |
|
870 |
print (string.format ('question[%i].class ', i), question.class) |
|
871 |
end |
|
872 |
||
873 |
local common = { name=1, type=1, class=1, ttl=1, rdlength=1, rdata=1 } |
|
874 |
local tmp |
|
875 |
for s,s in pairs {'answer', 'authority', 'additional'} do |
|
876 |
for i,rr in pairs (response[s]) do |
|
877 |
for j,t in pairs { 'name', 'type', 'class', 'ttl', 'rdlength' } do |
|
878 |
tmp = string.format ('%s[%i].%s', s, i, t) |
|
879 |
print (string.format ('%-30s', tmp), rr[t], hint (rr, t)) |
|
880 |
end |
|
881 |
for j,t in pairs (rr) do |
|
882 |
if not common[j] then |
|
883 |
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
|
884 |
print (string.format ('%-30s %s', tostring(tmp), tostring(t))) |
337 | 885 |
end end end end end |
886 |
||
887 |
||
888 |
-- module api ------------------------------------------------------ module api |
|
889 |
||
890 |
||
891 |
local function resolve (func, ...) -- - - - - - - - - - - - - - resolver_get |
|
892 |
return func (dns._resolver, ...) |
|
893 |
end |
|
894 |
||
895 |
||
896 |
function dns.resolver () -- - - - - - - - - - - - - - - - - - - - - resolver |
|
897 |
||
898 |
-- this function seems to be redundant with resolver.new () |
|
899 |
||
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
|
900 |
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
|
901 |
best_server = 1 } |
337 | 902 |
setmetatable (r, resolver) |
903 |
setmetatable (r.cache, cache_metatable) |
|
904 |
setmetatable (r.unsorted, { __mode = 'kv' }) |
|
905 |
return r |
|
906 |
end |
|
907 |
||
908 |
||
909 |
function dns.lookup (...) -- - - - - - - - - - - - - - - - - - - - - lookup |
|
910 |
return resolve (resolver.lookup, ...) end |
|
911 |
||
912 |
||
913 |
function dns.purge (...) -- - - - - - - - - - - - - - - - - - - - - - purge |
|
914 |
return resolve (resolver.purge, ...) end |
|
915 |
||
916 |
function dns.peek (...) -- - - - - - - - - - - - - - - - - - - - - - - peek |
|
917 |
return resolve (resolver.peek, ...) end |
|
918 |
||
919 |
||
920 |
function dns.query (...) -- - - - - - - - - - - - - - - - - - - - - - query |
|
921 |
return resolve (resolver.query, ...) end |
|
922 |
||
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
923 |
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
|
924 |
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
|
925 |
|
1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
926 |
function dns.cancel(...) -- - - - - - - - - - - - - - - - - - - - - - cancel |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
927 |
return resolve(resolver.cancel, ...) end |
337 | 928 |
|
929 |
function dns:socket_wrapper_set (...) -- - - - - - - - - socket_wrapper_set |
|
930 |
return resolve (resolver.socket_wrapper_set, ...) end |
|
931 |
||
2068
1e1ee53d7f6e
net.dns: Initialize default resolver on module load (instead of on first use).
Waqas Hussain <waqas20@gmail.com>
parents:
2067
diff
changeset
|
932 |
dns._resolver = dns.resolver () |
337 | 933 |
|
934 |
return dns |