Software / code / prosody
Annotate
net/dns.lua @ 2068:1e1ee53d7f6e
net.dns: Initialize default resolver on module load (instead of on first use).
| author | Waqas Hussain <waqas20@gmail.com> |
|---|---|
| date | Mon, 02 Nov 2009 00:52:35 +0500 |
| parent | 2067:0ed6369605bf |
| child | 2069:72357b1c6d88 |
| rev | line source |
|---|---|
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changeset
|
1 -- Prosody IM |
| 615 | 2 -- This file is included with Prosody IM. It has modifications, |
| 3 -- which are hereby placed in the public domain. | |
| 337 | 4 |
| 5 -- public domain 20080404 lua@ztact.com | |
| 6 | |
| 7 | |
| 8 -- todo: quick (default) header generation | |
| 9 -- todo: nxdomain, error handling | |
| 10 -- todo: cache results of encodeName | |
| 11 | |
| 12 | |
| 13 -- reference: http://tools.ietf.org/html/rfc1035 | |
| 14 -- reference: http://tools.ietf.org/html/rfc1876 (LOC) | |
| 15 | |
| 16 | |
| 17 require 'socket' | |
| 18 local ztact = require 'util.ztact' | |
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19 local require = require |
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2067
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net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
Waqas Hussain <waqas20@gmail.com>
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2027
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20 local _, windows = pcall(require, "util.windows"); |
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net.dns: Updated to use util.windows.get_nameservers for enumerating nameservers on Windows.
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21 local is_windows = (_ and windows) or os.getenv("WINDIR"); |
| 337 | 22 |
| 23 local coroutine, io, math, socket, string, table = | |
| 24 coroutine, io, math, socket, string, table | |
| 25 | |
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net.dns: Add support for cancelling a coroutine-based request
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26 local ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack = |
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27 ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack |
| 337 | 28 |
| 29 local get, set = ztact.get, ztact.set | |
| 30 | |
| 31 | |
| 32 -------------------------------------------------- module dns | |
| 33 module ('dns') | |
| 34 local dns = _M; | |
| 35 | |
| 36 | |
| 37 -- dns type & class codes ------------------------------ dns type & class codes | |
| 38 | |
| 39 | |
| 40 local append = table.insert | |
| 41 | |
| 42 | |
| 43 local function highbyte (i) -- - - - - - - - - - - - - - - - - - - highbyte | |
| 44 return (i-(i%0x100))/0x100 | |
| 45 end | |
| 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 | |
| 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 | |
| 65 | |
| 66 | |
| 67 dns.types = { | |
| 68 'A', 'NS', 'MD', 'MF', 'CNAME', 'SOA', 'MB', 'MG', 'MR', 'NULL', 'WKS', | |
| 69 'PTR', 'HINFO', 'MINFO', 'MX', 'TXT', | |
| 70 [ 28] = 'AAAA', [ 29] = 'LOC', [ 33] = 'SRV', | |
| 71 [252] = 'AXFR', [253] = 'MAILB', [254] = 'MAILA', [255] = '*' } | |
| 72 | |
| 73 | |
| 74 dns.classes = { 'IN', 'CS', 'CH', 'HS', [255] = '*' } | |
| 75 | |
| 76 | |
| 77 dns.type = augment (dns.types) | |
| 78 dns.class = augment (dns.classes) | |
| 79 dns.typecode = encode (dns.types) | |
| 80 dns.classcode = encode (dns.classes) | |
| 81 | |
| 82 | |
| 83 | |
| 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 | |
| 90 | |
| 91 local function prune (rrs, time, soft) -- - - - - - - - - - - - - - - prune | |
| 92 | |
| 93 time = time or socket.gettime () | |
| 94 for i,rr in pairs (rrs) do | |
| 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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net.dns: Remove elements from the cache when expired so as to not leave holes in the array
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99 if rr.ttl <= 0 then |
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net.dns: Remove elements from the cache when expired so as to not leave holes in the array
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100 table.remove(rrs, i); |
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101 return prune(rrs, time, soft); -- Re-iterate |
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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 | |
| 109 | |
| 110 -- metatables & co. ------------------------------------------ metatables & co. | |
| 111 | |
| 112 | |
| 113 local resolver = {} | |
| 114 resolver.__index = resolver | |
| 115 | |
| 116 | |
| 117 local SRV_tostring | |
| 118 | |
| 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 | |
| 137 | |
| 138 local rrs_metatable = {} -- - - - - - - - - - - - - - - - - - rrs_metatable | |
| 139 function rrs_metatable.__tostring (rrs) | |
|
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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 | |
| 145 | |
| 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 | |
| 158 | |
| 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' }) | |
| 164 return r | |
| 165 end | |
| 166 | |
| 167 | |
| 168 -- packet layer -------------------------------------------------- packet layer | |
| 169 | |
| 170 | |
| 171 function dns.random (...) -- - - - - - - - - - - - - - - - - - - dns.random | |
| 172 math.randomseed (10000*socket.gettime ()) | |
| 173 dns.random = math.random | |
| 174 return dns.random (...) | |
| 175 end | |
| 176 | |
| 177 | |
| 178 local function encodeHeader (o) -- - - - - - - - - - - - - - - encodeHeader | |
| 179 | |
| 180 o = o or {} | |
| 181 | |
| 182 o.id = o.id or -- 16b (random) id | |
| 183 dns.random (0, 0xffff) | |
| 184 | |
| 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 | |
| 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) | |
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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 () | |
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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 ()] | |
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parents:
759
diff
changeset
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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 () | |
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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 | |
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net.dns: Don't expire records with TTL of 0 instantly
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parents:
1982
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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 | |
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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 | |
|
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511 if is_windows then |
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512 if windows then |
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513 for _, server in ipairs(windows.get_nameservers()) do |
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514 self:addnameserver(server) |
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515 end |
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516 end |
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517 if not self.server or #self.server == 0 then |
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518 -- TODO log warning about no nameservers, adding opendns servers as fallback |
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519 self:addnameserver("208.67.222.222") |
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520 self:addnameserver("208.67.220.220") |
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521 end |
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522 else -- posix |
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523 local resolv_conf = io.open("/etc/resolv.conf"); |
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524 if resolv_conf then |
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525 for line in resolv_conf:lines() do |
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526 local address = line:gsub("#.*$", ""):match('^%s*nameserver%s+(%d+%.%d+%.%d+%.%d+)%s*$') |
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527 if address then self:addnameserver (address) end |
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528 end |
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529 end |
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530 if not self.server or #self.server == 0 then |
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531 -- TODO log warning about no nameservers, adding localhost as the default nameserver |
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532 self:addnameserver("127.0.0.1"); |
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533 end |
|
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534 end |
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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 () | |
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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 | |
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553 self.socketset[sock] = servernum |
| 337 | 554 return sock |
| 555 end | |
| 556 | |
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557 function resolver:voidsocket (sock) |
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558 if self.socket[sock] then |
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559 self.socketset[self.socket[sock]] = nil |
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560 self.socket[sock] = nil |
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561 elseif self.socketset[sock] then |
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562 self.socket[self.socketset[sock]] = nil |
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563 self.socketset[sock] = nil |
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564 end |
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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 | |
|
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573 for i,sock in ipairs (self.socket) do |
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574 self.socket[i] = nil; |
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575 self.socketset[sock] = nil; |
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576 sock:close(); |
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577 end |
| 337 | 578 end |
| 579 | |
| 580 | |
| 581 function resolver:remember (rr, type) -- - - - - - - - - - - - - - remember | |
| 582 | |
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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) | |
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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 | |
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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 | |
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633 if not self.server then self:adddefaultnameservers () end |
| 337 | 634 |
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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 () | |
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640 --print ('query id', id, qclass, qtype, qname) |
| 337 | 641 local o = { packet = header..question, |
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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) | |
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654 --set (self.yielded, co, qclass, qtype, qname, true) |
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655 end |
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656 |
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657 self:getsocket (o.server):send (o.packet) |
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658 |
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659 end |
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660 |
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661 function resolver:servfail(sock) |
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662 -- Resend all queries for this server |
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663 |
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664 local num = self.socketset[sock] |
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665 |
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666 -- Socket is dead now |
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667 self:voidsocket(sock); |
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668 |
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669 -- Find all requests to the down server, and retry on the next server |
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670 self.time = socket.gettime () |
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671 for id,queries in pairs (self.active) do |
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672 for question,o in pairs (queries) do |
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673 if o.server == num then -- This request was to the broken server |
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674 o.server = o.server + 1 -- Use next server |
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675 if o.server > #self.server then |
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676 o.server = 1 |
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677 end |
| 337 | 678 |
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679 o.retries = (o.retries or 0) + 1; |
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680 if o.retries >= #self.server then |
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681 --print ('timeout') |
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682 queries[question] = nil |
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683 else |
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684 local _a = self:getsocket(o.server); |
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685 if _a then _a:send (o.packet) end |
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686 end |
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687 end |
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688 end |
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689 end |
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690 |
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691 if num == self.best_server then |
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692 self.best_server = self.best_server + 1 |
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693 if self.best_server > #self.server then |
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694 -- Exhausted all servers, try first again |
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695 self.best_server = 1 |
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696 end |
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697 end |
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698 end |
| 337 | 699 |
| 700 function resolver:receive (rset) -- - - - - - - - - - - - - - - - - receive | |
| 701 | |
|
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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 | |
|
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715 --print 'received response' |
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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) | |
|
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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 | |
|
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744 function resolver:feed(sock, packet) |
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745 --print 'receive' print (self.socket) |
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746 self.time = socket.gettime () |
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747 |
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748 local response = self:decode (packet) |
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749 if response then |
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750 --print 'received response' |
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751 --self.print (response) |
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752 |
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753 for i,section in pairs { 'answer', 'authority', 'additional' } do |
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754 for j,rr in pairs (response[section]) do |
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755 self:remember (rr, response.question[1].type) |
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756 end |
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757 end |
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758 |
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759 -- retire the query |
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760 local queries = self.active[response.header.id] |
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761 if queries[response.question.raw] then |
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762 queries[response.question.raw] = nil |
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763 end |
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764 if not next (queries) then self.active[response.header.id] = nil end |
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765 if not next (self.active) then self:closeall () end |
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766 |
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767 -- was the query on the wanted list? |
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768 local q = response.question[1] |
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769 if q then |
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770 local cos = get (self.wanted, q.class, q.type, q.name) |
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771 if cos then |
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772 for co in pairs (cos) do |
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773 set (self.yielded, co, q.class, q.type, q.name, nil) |
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774 if coroutine.status(co) == "suspended" then coroutine.resume (co) end |
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775 end |
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776 set (self.wanted, q.class, q.type, q.name, nil) |
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777 end |
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778 end |
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779 end |
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780 |
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781 return response |
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782 end |
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|
783 |
|
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784 function resolver:cancel(data) |
|
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785 local cos = get (self.wanted, unpack(data, 1, 3)) |
|
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786 if cos then |
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787 cos[data[4]] = nil; |
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788 end |
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789 end |
|
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790 |
| 337 | 791 function resolver:pulse () -- - - - - - - - - - - - - - - - - - - - - pulse |
| 792 | |
|
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793 --print ':pulse' |
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|
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 | |
|
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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 | |
|
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814 --print ('retry', o.server, o.delay) |
|
453
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815 local _a = self.socket[o.server]; |
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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 | |
|
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828 --print (self.cache) |
| 337 | 829 return self:peek (qname, qtype, qclass) |
| 830 end | |
| 831 | |
|
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832 function resolver:lookupex (handler, qname, qtype, qclass) -- - - - - - - - - - lookup |
|
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833 return self:peek (qname, qtype, qclass) or self:query (qname, qtype, qclass) |
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834 end |
| 337 | 835 |
|
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836 |
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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) | |
|
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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
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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
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net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
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923 function dns.feed (...) -- - - - - - - - - - - - - - - - - - - - - - feed |
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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 |
