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net/dns.lua @ 2167:e41a6ea7fc0f
xmppclient_listener: Escape control characters when logging invalid XML.
author | Waqas Hussain <waqas20@gmail.com> |
---|---|
date | Tue, 24 Nov 2009 22:42:08 +0500 |
parent | 2082:1381b2071c2e |
child | 2278:8c10f13c0c20 |
child | 2762:2bddf8b766f7 |
child | 2856:70e6ea49aff3 |
rev | line source |
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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 | |
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17 local socket = require "socket"; |
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18 local ztact = require "util.ztact"; |
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19 local _, windows = pcall(require, "util.windows"); |
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20 local is_windows = (_ and windows) or os.getenv("WINDIR"); |
337 | 21 |
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22 local coroutine, io, math, string, table = |
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23 coroutine, io, math, string, table; |
337 | 24 |
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25 local ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack = |
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26 ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack; |
337 | 27 |
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28 local get, set = ztact.get, ztact.set; |
337 | 29 |
30 | |
31 -------------------------------------------------- module dns | |
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32 module('dns') |
337 | 33 local dns = _M; |
34 | |
35 | |
36 -- dns type & class codes ------------------------------ dns type & class codes | |
37 | |
38 | |
39 local append = table.insert | |
40 | |
41 | |
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42 local function highbyte(i) -- - - - - - - - - - - - - - - - - - - highbyte |
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43 return (i-(i%0x100))/0x100; |
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44 end |
337 | 45 |
46 | |
47 local function augment (t) -- - - - - - - - - - - - - - - - - - - - augment | |
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48 local a = {}; |
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49 for i,s in pairs(t) do |
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50 a[i] = s; |
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51 a[s] = s; |
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52 a[string.lower(s)] = s; |
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53 end |
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54 return a; |
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55 end |
337 | 56 |
57 | |
58 local function encode (t) -- - - - - - - - - - - - - - - - - - - - - encode | |
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59 local code = {}; |
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60 for i,s in pairs(t) do |
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61 local word = string.char(highbyte(i), i%0x100); |
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62 code[i] = word; |
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63 code[s] = word; |
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64 code[string.lower(s)] = word; |
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65 end |
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66 return code; |
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67 end |
337 | 68 |
69 | |
70 dns.types = { | |
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71 'A', 'NS', 'MD', 'MF', 'CNAME', 'SOA', 'MB', 'MG', 'MR', 'NULL', 'WKS', |
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72 'PTR', 'HINFO', 'MINFO', 'MX', 'TXT', |
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73 [ 28] = 'AAAA', [ 29] = 'LOC', [ 33] = 'SRV', |
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74 [252] = 'AXFR', [253] = 'MAILB', [254] = 'MAILA', [255] = '*' }; |
337 | 75 |
76 | |
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77 dns.classes = { 'IN', 'CS', 'CH', 'HS', [255] = '*' }; |
337 | 78 |
79 | |
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80 dns.type = augment (dns.types); |
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81 dns.class = augment (dns.classes); |
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82 dns.typecode = encode (dns.types); |
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83 dns.classcode = encode (dns.classes); |
337 | 84 |
85 | |
86 | |
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87 local function standardize(qname, qtype, qclass) -- - - - - - - standardize |
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88 if string.byte(qname, -1) ~= 0x2E then qname = qname..'.'; end |
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89 qname = string.lower(qname); |
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90 return qname, dns.type[qtype or 'A'], dns.class[qclass or 'IN']; |
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91 end |
337 | 92 |
93 | |
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94 local function prune(rrs, time, soft) -- - - - - - - - - - - - - - - prune |
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95 time = time or socket.gettime(); |
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96 for i,rr in pairs(rrs) do |
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97 if rr.tod then |
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98 -- rr.tod = rr.tod - 50 -- accelerated decripitude |
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99 rr.ttl = math.floor(rr.tod - time); |
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100 if rr.ttl <= 0 then |
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101 table.remove(rrs, i); |
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102 return prune(rrs, time, soft); -- Re-iterate |
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103 end |
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104 elseif soft == 'soft' then -- What is this? I forget! |
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105 assert(rr.ttl == 0); |
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106 rrs[i] = nil; |
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107 end |
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108 end |
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109 end |
337 | 110 |
111 | |
112 -- metatables & co. ------------------------------------------ metatables & co. | |
113 | |
114 | |
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115 local resolver = {}; |
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116 resolver.__index = resolver; |
337 | 117 |
118 | |
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119 local SRV_tostring; |
337 | 120 |
121 | |
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122 local rr_metatable = {}; -- - - - - - - - - - - - - - - - - - - rr_metatable |
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123 function rr_metatable.__tostring(rr) |
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124 local s0 = string.format('%2s %-5s %6i %-28s', rr.class, rr.type, rr.ttl, rr.name); |
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125 local s1 = ''; |
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126 if rr.type == 'A' then |
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127 s1 = ' '..rr.a; |
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128 elseif rr.type == 'MX' then |
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129 s1 = string.format(' %2i %s', rr.pref, rr.mx); |
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130 elseif rr.type == 'CNAME' then |
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131 s1 = ' '..rr.cname; |
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132 elseif rr.type == 'LOC' then |
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133 s1 = ' '..resolver.LOC_tostring(rr); |
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134 elseif rr.type == 'NS' then |
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135 s1 = ' '..rr.ns; |
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136 elseif rr.type == 'SRV' then |
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137 s1 = ' '..SRV_tostring(rr); |
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138 elseif rr.type == 'TXT' then |
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139 s1 = ' '..rr.txt; |
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140 else |
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141 s1 = ' <UNKNOWN RDATA TYPE>'; |
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142 end |
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143 return s0..s1; |
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144 end |
337 | 145 |
146 | |
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147 local rrs_metatable = {}; -- - - - - - - - - - - - - - - - - - rrs_metatable |
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148 function rrs_metatable.__tostring(rrs) |
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149 local t = {}; |
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150 for i,rr in pairs(rrs) do |
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151 append(t, tostring(rr)..'\n'); |
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152 end |
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153 return table.concat(t); |
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154 end |
337 | 155 |
156 | |
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157 local cache_metatable = {}; -- - - - - - - - - - - - - - - - cache_metatable |
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158 function cache_metatable.__tostring(cache) |
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159 local time = socket.gettime(); |
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160 local t = {}; |
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161 for class,types in pairs(cache) do |
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162 for type,names in pairs(types) do |
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163 for name,rrs in pairs(names) do |
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164 prune(rrs, time); |
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165 append(t, tostring(rrs)); |
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166 end |
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167 end |
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168 end |
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169 return table.concat(t); |
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170 end |
337 | 171 |
172 | |
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173 function resolver:new() -- - - - - - - - - - - - - - - - - - - - - resolver |
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174 local r = { active = {}, cache = {}, unsorted = {} }; |
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175 setmetatable(r, resolver); |
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176 setmetatable(r.cache, cache_metatable); |
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177 setmetatable(r.unsorted, { __mode = 'kv' }); |
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178 return r; |
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179 end |
337 | 180 |
181 | |
182 -- packet layer -------------------------------------------------- packet layer | |
183 | |
184 | |
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185 function dns.random(...) -- - - - - - - - - - - - - - - - - - - dns.random |
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186 math.randomseed(10000*socket.gettime()); |
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187 dns.random = math.random; |
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188 return dns.random(...); |
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189 end |
337 | 190 |
191 | |
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192 local function encodeHeader(o) -- - - - - - - - - - - - - - - encodeHeader |
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193 o = o or {}; |
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194 o.id = o.id or dns.random(0, 0xffff); -- 16b (random) id |
337 | 195 |
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196 o.rd = o.rd or 1; -- 1b 1 recursion desired |
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197 o.tc = o.tc or 0; -- 1b 1 truncated response |
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198 o.aa = o.aa or 0; -- 1b 1 authoritative response |
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199 o.opcode = o.opcode or 0; -- 4b 0 query |
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200 -- 1 inverse query |
337 | 201 -- 2 server status request |
202 -- 3-15 reserved | |
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203 o.qr = o.qr or 0; -- 1b 0 query, 1 response |
337 | 204 |
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205 o.rcode = o.rcode or 0; -- 4b 0 no error |
337 | 206 -- 1 format error |
207 -- 2 server failure | |
208 -- 3 name error | |
209 -- 4 not implemented | |
210 -- 5 refused | |
211 -- 6-15 reserved | |
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212 o.z = o.z or 0; -- 3b 0 resvered |
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213 o.ra = o.ra or 0; -- 1b 1 recursion available |
337 | 214 |
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215 o.qdcount = o.qdcount or 1; -- 16b number of question RRs |
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216 o.ancount = o.ancount or 0; -- 16b number of answers RRs |
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217 o.nscount = o.nscount or 0; -- 16b number of nameservers RRs |
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218 o.arcount = o.arcount or 0; -- 16b number of additional RRs |
337 | 219 |
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220 -- string.char() rounds, so prevent roundup with -0.4999 |
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221 local header = string.char( |
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222 highbyte(o.id), o.id %0x100, |
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223 o.rd + 2*o.tc + 4*o.aa + 8*o.opcode + 128*o.qr, |
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224 o.rcode + 16*o.z + 128*o.ra, |
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225 highbyte(o.qdcount), o.qdcount %0x100, |
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226 highbyte(o.ancount), o.ancount %0x100, |
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227 highbyte(o.nscount), o.nscount %0x100, |
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228 highbyte(o.arcount), o.arcount %0x100 |
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229 ); |
337 | 230 |
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231 return header, o.id; |
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232 end |
337 | 233 |
234 | |
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235 local function encodeName(name) -- - - - - - - - - - - - - - - - encodeName |
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236 local t = {}; |
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237 for part in string.gmatch(name, '[^.]+') do |
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238 append(t, string.char(string.len(part))); |
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239 append(t, part); |
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240 end |
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241 append(t, string.char(0)); |
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242 return table.concat(t); |
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243 end |
337 | 244 |
245 | |
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246 local function encodeQuestion(qname, qtype, qclass) -- - - - encodeQuestion |
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247 qname = encodeName(qname); |
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248 qtype = dns.typecode[qtype or 'a']; |
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249 qclass = dns.classcode[qclass or 'in']; |
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250 return qname..qtype..qclass; |
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251 end |
337 | 252 |
253 | |
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254 function resolver:byte(len) -- - - - - - - - - - - - - - - - - - - - - byte |
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255 len = len or 1; |
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256 local offset = self.offset; |
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257 local last = offset + len - 1; |
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258 if last > #self.packet then |
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259 error(string.format('out of bounds: %i>%i', last, #self.packet)); |
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260 end |
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261 self.offset = offset + len; |
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262 return string.byte(self.packet, offset, last); |
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263 end |
337 | 264 |
265 | |
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266 function resolver:word() -- - - - - - - - - - - - - - - - - - - - - - word |
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267 local b1, b2 = self:byte(2); |
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268 return 0x100*b1 + b2; |
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269 end |
337 | 270 |
271 | |
272 function resolver:dword () -- - - - - - - - - - - - - - - - - - - - - dword | |
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273 local b1, b2, b3, b4 = self:byte(4); |
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274 --print('dword', b1, b2, b3, b4); |
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275 return 0x1000000*b1 + 0x10000*b2 + 0x100*b3 + b4; |
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276 end |
337 | 277 |
278 | |
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279 function resolver:sub(len) -- - - - - - - - - - - - - - - - - - - - - - sub |
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280 len = len or 1; |
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281 local s = string.sub(self.packet, self.offset, self.offset + len - 1); |
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282 self.offset = self.offset + len; |
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283 return s; |
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284 end |
337 | 285 |
286 | |
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287 function resolver:header(force) -- - - - - - - - - - - - - - - - - - header |
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288 local id = self:word(); |
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289 --print(string.format(':header id %x', id)); |
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290 if not self.active[id] and not force then return nil; end |
337 | 291 |
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292 local h = { id = id }; |
337 | 293 |
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294 local b1, b2 = self:byte(2); |
337 | 295 |
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296 h.rd = b1 %2; |
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297 h.tc = b1 /2%2; |
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298 h.aa = b1 /4%2; |
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299 h.opcode = b1 /8%16; |
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300 h.qr = b1 /128; |
337 | 301 |
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302 h.rcode = b2 %16; |
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303 h.z = b2 /16%8; |
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304 h.ra = b2 /128; |
337 | 305 |
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306 h.qdcount = self:word(); |
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307 h.ancount = self:word(); |
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308 h.nscount = self:word(); |
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309 h.arcount = self:word(); |
337 | 310 |
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311 for k,v in pairs(h) do h[k] = v-v%1; end |
337 | 312 |
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313 return h; |
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314 end |
337 | 315 |
316 | |
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317 function resolver:name() -- - - - - - - - - - - - - - - - - - - - - - name |
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318 local remember, pointers = nil, 0; |
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319 local len = self:byte(); |
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320 local n = {}; |
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321 while len > 0 do |
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322 if len >= 0xc0 then -- name is "compressed" |
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323 pointers = pointers + 1; |
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324 if pointers >= 20 then error('dns error: 20 pointers'); end; |
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325 local offset = ((len-0xc0)*0x100) + self:byte(); |
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326 remember = remember or self.offset; |
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327 self.offset = offset + 1; -- +1 for lua |
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328 else -- name is not compressed |
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329 append(n, self:sub(len)..'.'); |
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330 end |
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331 len = self:byte(); |
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332 end |
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333 self.offset = remember or self.offset; |
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334 return table.concat(n); |
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335 end |
337 | 336 |
337 | |
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338 function resolver:question() -- - - - - - - - - - - - - - - - - - question |
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339 local q = {}; |
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340 q.name = self:name(); |
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341 q.type = dns.type[self:word()]; |
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342 q.class = dns.class[self:word()]; |
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343 return q; |
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344 end |
337 | 345 |
346 | |
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347 function resolver:A(rr) -- - - - - - - - - - - - - - - - - - - - - - - - A |
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348 local b1, b2, b3, b4 = self:byte(4); |
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349 rr.a = string.format('%i.%i.%i.%i', b1, b2, b3, b4); |
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350 end |
337 | 351 |
352 | |
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353 function resolver:CNAME(rr) -- - - - - - - - - - - - - - - - - - - - CNAME |
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354 rr.cname = self:name(); |
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355 end |
337 | 356 |
357 | |
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358 function resolver:MX(rr) -- - - - - - - - - - - - - - - - - - - - - - - MX |
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359 rr.pref = self:word(); |
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360 rr.mx = self:name(); |
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361 end |
337 | 362 |
363 | |
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364 function resolver:LOC_nibble_power() -- - - - - - - - - - LOC_nibble_power |
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365 local b = self:byte(); |
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366 --print('nibbles', ((b-(b%0x10))/0x10), (b%0x10)); |
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367 return ((b-(b%0x10))/0x10) * (10^(b%0x10)); |
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368 end |
337 | 369 |
370 | |
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371 function resolver:LOC(rr) -- - - - - - - - - - - - - - - - - - - - - - LOC |
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372 rr.version = self:byte(); |
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373 if rr.version == 0 then |
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374 rr.loc = rr.loc or {}; |
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375 rr.loc.size = self:LOC_nibble_power(); |
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376 rr.loc.horiz_pre = self:LOC_nibble_power(); |
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377 rr.loc.vert_pre = self:LOC_nibble_power(); |
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378 rr.loc.latitude = self:dword(); |
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379 rr.loc.longitude = self:dword(); |
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380 rr.loc.altitude = self:dword(); |
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381 end |
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382 end |
337 | 383 |
384 | |
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385 local function LOC_tostring_degrees(f, pos, neg) -- - - - - - - - - - - - - |
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386 f = f - 0x80000000; |
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387 if f < 0 then pos = neg; f = -f; end |
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388 local deg, min, msec; |
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389 msec = f%60000; |
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390 f = (f-msec)/60000; |
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391 min = f%60; |
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392 deg = (f-min)/60; |
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393 return string.format('%3d %2d %2.3f %s', deg, min, msec/1000, pos); |
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394 end |
337 | 395 |
396 | |
2069
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397 function resolver.LOC_tostring(rr) -- - - - - - - - - - - - - LOC_tostring |
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398 local t = {}; |
337 | 399 |
2069
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400 --[[ |
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401 for k,name in pairs { 'size', 'horiz_pre', 'vert_pre', 'latitude', 'longitude', 'altitude' } do |
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402 append(t, string.format('%4s%-10s: %12.0f\n', '', name, rr.loc[name])); |
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403 end |
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404 --]] |
337 | 405 |
2069
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406 append(t, string.format( |
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407 '%s %s %.2fm %.2fm %.2fm %.2fm', |
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408 LOC_tostring_degrees (rr.loc.latitude, 'N', 'S'), |
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409 LOC_tostring_degrees (rr.loc.longitude, 'E', 'W'), |
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410 (rr.loc.altitude - 10000000) / 100, |
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|
411 rr.loc.size / 100, |
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|
412 rr.loc.horiz_pre / 100, |
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413 rr.loc.vert_pre / 100 |
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414 )); |
337 | 415 |
2069
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416 return table.concat(t); |
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417 end |
337 | 418 |
419 | |
2069
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420 function resolver:NS(rr) -- - - - - - - - - - - - - - - - - - - - - - - NS |
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421 rr.ns = self:name(); |
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422 end |
337 | 423 |
424 | |
2069
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425 function resolver:SOA(rr) -- - - - - - - - - - - - - - - - - - - - - - SOA |
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426 end |
337 | 427 |
428 | |
2069
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429 function resolver:SRV(rr) -- - - - - - - - - - - - - - - - - - - - - - SRV |
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430 rr.srv = {}; |
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431 rr.srv.priority = self:word(); |
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432 rr.srv.weight = self:word(); |
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433 rr.srv.port = self:word(); |
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434 rr.srv.target = self:name(); |
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|
435 end |
337 | 436 |
437 | |
2069
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
438 function SRV_tostring(rr) -- - - - - - - - - - - - - - - - - - SRV_tostring |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
439 local s = rr.srv; |
72357b1c6d88
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parents:
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diff
changeset
|
440 return string.format( '%5d %5d %5d %s', s.priority, s.weight, s.port, s.target ); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
441 end |
337 | 442 |
443 | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
444 function resolver:TXT(rr) -- - - - - - - - - - - - - - - - - - - - - - TXT |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
445 rr.txt = self:sub (rr.rdlength); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
446 end |
337 | 447 |
448 | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
449 function resolver:rr() -- - - - - - - - - - - - - - - - - - - - - - - - rr |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
450 local rr = {}; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
451 setmetatable(rr, rr_metatable); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
452 rr.name = self:name(self); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
453 rr.type = dns.type[self:word()] or rr.type; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
454 rr.class = dns.class[self:word()] or rr.class; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
455 rr.ttl = 0x10000*self:word() + self:word(); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
456 rr.rdlength = self:word(); |
337 | 457 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
458 if rr.ttl <= 0 then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
459 rr.tod = self.time + 30; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
460 else |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
461 rr.tod = self.time + rr.ttl; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
462 end |
337 | 463 |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
464 local remember = self.offset; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
465 local rr_parser = self[dns.type[rr.type]]; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
466 if rr_parser then rr_parser(self, rr); end |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
467 self.offset = remember; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
468 rr.rdata = self:sub(rr.rdlength); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
469 return rr; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
470 end |
337 | 471 |
472 | |
473 function resolver:rrs (count) -- - - - - - - - - - - - - - - - - - - - - rrs | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
474 local rrs = {}; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
475 for i = 1,count do append(rrs, self:rr()); end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
476 return rrs; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
477 end |
337 | 478 |
479 | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
480 function resolver:decode(packet, force) -- - - - - - - - - - - - - - decode |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
481 self.packet, self.offset = packet, 1; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
482 local header = self:header(force); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
483 if not header then return nil; end |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
484 local response = { header = header }; |
337 | 485 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
486 response.question = {}; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
487 local offset = self.offset; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
488 for i = 1,response.header.qdcount do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
489 append(response.question, self:question()); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
490 end |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
491 response.question.raw = string.sub(self.packet, offset, self.offset - 1); |
337 | 492 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
493 if not force then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
494 if not self.active[response.header.id] or not self.active[response.header.id][response.question.raw] then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
495 return nil; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
496 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
497 end |
337 | 498 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
499 response.answer = self:rrs(response.header.ancount); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
500 response.authority = self:rrs(response.header.nscount); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
501 response.additional = self:rrs(response.header.arcount); |
337 | 502 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
503 return response; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
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parents:
2068
diff
changeset
|
504 end |
337 | 505 |
506 | |
507 -- socket layer -------------------------------------------------- socket layer | |
508 | |
509 | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
510 resolver.delays = { 1, 3 }; |
337 | 511 |
512 | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
513 function resolver:addnameserver(address) -- - - - - - - - - - addnameserver |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
514 self.server = self.server or {}; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
515 append(self.server, address); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
516 end |
337 | 517 |
518 | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
519 function resolver:setnameserver(address) -- - - - - - - - - - setnameserver |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
520 self.server = {}; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
521 self:addnameserver(address); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
522 end |
337 | 523 |
524 | |
2069
72357b1c6d88
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parents:
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diff
changeset
|
525 function resolver:adddefaultnameservers() -- - - - - adddefaultnameservers |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
526 if is_windows then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
527 if windows then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
528 for _, server in ipairs(windows.get_nameservers()) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
529 self:addnameserver(server); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
530 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
531 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
532 if not self.server or #self.server == 0 then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
533 -- TODO log warning about no nameservers, adding opendns servers as fallback |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
534 self:addnameserver("208.67.222.222"); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
535 self:addnameserver("208.67.220.220") ; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
536 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
537 else -- posix |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
538 local resolv_conf = io.open("/etc/resolv.conf"); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
539 if resolv_conf then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
540 for line in resolv_conf:lines() do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
541 local address = line:gsub("#.*$", ""):match('^%s*nameserver%s+(%d+%.%d+%.%d+%.%d+)%s*$'); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
542 if address then self:addnameserver(address) end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
543 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
544 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
545 if not self.server or #self.server == 0 then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
546 -- TODO log warning about no nameservers, adding localhost as the default nameserver |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
547 self:addnameserver("127.0.0.1"); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
548 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
549 end |
399
93b6587d9afb
Added temporary fix for srv on windows: using opendns nameservers
Waqas Hussain <waqas20@gmail.com>
parents:
379
diff
changeset
|
550 end |
337 | 551 |
552 | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
553 function resolver:getsocket(servernum) -- - - - - - - - - - - - - getsocket |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
554 self.socket = self.socket or {}; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
555 self.socketset = self.socketset or {}; |
337 | 556 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
557 local sock = self.socket[servernum]; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
558 if sock then return sock; end |
337 | 559 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
560 sock = socket.udp(); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
561 if self.socket_wrapper then sock = self.socket_wrapper(sock, self); end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
562 sock:settimeout(0); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
563 -- todo: attempt to use a random port, fallback to 0 |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
564 sock:setsockname('*', 0); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
565 sock:setpeername(self.server[servernum], 53); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
566 self.socket[servernum] = sock; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
567 self.socketset[sock] = servernum; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
568 return 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
|
569 end |
337 | 570 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
571 function resolver:voidsocket(sock) |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
572 if self.socket[sock] then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
573 self.socketset[self.socket[sock]] = nil; |
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Waqas Hussain <waqas20@gmail.com>
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|
574 self.socket[sock] = nil; |
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|
575 elseif self.socketset[sock] then |
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|
576 self.socket[self.socketset[sock]] = nil; |
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|
577 self.socketset[sock] = nil; |
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|
578 end |
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|
579 end |
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diff
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|
580 |
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|
581 function resolver:socket_wrapper_set(func) -- - - - - - - socket_wrapper_set |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
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|
582 self.socket_wrapper = func; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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|
583 end |
337 | 584 |
585 | |
586 function resolver:closeall () -- - - - - - - - - - - - - - - - - - closeall | |
2069
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|
587 for i,sock in ipairs(self.socket) do |
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|
588 self.socket[i] = nil; |
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|
589 self.socketset[sock] = nil; |
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parents:
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|
590 sock:close(); |
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|
591 end |
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parents:
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diff
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|
592 end |
337 | 593 |
594 | |
2069
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changeset
|
595 function resolver:remember(rr, type) -- - - - - - - - - - - - - - remember |
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
596 --print ('remember', type, rr.class, rr.type, rr.name) |
337 | 597 |
2069
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|
598 if type ~= '*' then |
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diff
changeset
|
599 type = rr.type; |
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Waqas Hussain <waqas20@gmail.com>
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|
600 local all = get(self.cache, rr.class, '*', rr.name); |
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parents:
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|
601 --print('remember all', all); |
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Waqas Hussain <waqas20@gmail.com>
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|
602 if all then append(all, rr); end |
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changeset
|
603 end |
337 | 604 |
2069
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|
605 self.cache = self.cache or setmetatable({}, cache_metatable); |
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Waqas Hussain <waqas20@gmail.com>
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|
606 local rrs = get(self.cache, rr.class, type, rr.name) or |
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parents:
2068
diff
changeset
|
607 set(self.cache, rr.class, type, rr.name, setmetatable({}, rrs_metatable)); |
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changeset
|
608 append(rrs, rr); |
337 | 609 |
2069
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changeset
|
610 if type == 'MX' then self.unsorted[rrs] = true; end |
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|
611 end |
337 | 612 |
613 | |
2069
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changeset
|
614 local function comp_mx(a, b) -- - - - - - - - - - - - - - - - - - - comp_mx |
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|
615 return (a.pref == b.pref) and (a.mx < b.mx) or (a.pref < b.pref); |
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|
616 end |
337 | 617 |
618 | |
619 function resolver:peek (qname, qtype, qclass) -- - - - - - - - - - - - peek | |
2069
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|
620 qname, qtype, qclass = standardize(qname, qtype, qclass); |
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parents:
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|
621 local rrs = get(self.cache, qclass, qtype, qname); |
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|
622 if not rrs then return nil; end |
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
623 if prune(rrs, socket.gettime()) and qtype == '*' or not next(rrs) then |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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|
624 set(self.cache, qclass, qtype, qname, nil); |
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|
625 return nil; |
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|
626 end |
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|
627 if self.unsorted[rrs] then table.sort (rrs, comp_mx); end |
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|
628 return rrs; |
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|
629 end |
337 | 630 |
631 | |
2069
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diff
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|
632 function resolver:purge(soft) -- - - - - - - - - - - - - - - - - - - purge |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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|
633 if soft == 'soft' then |
72357b1c6d88
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|
634 self.time = socket.gettime(); |
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Waqas Hussain <waqas20@gmail.com>
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diff
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|
635 for class,types in pairs(self.cache or {}) do |
72357b1c6d88
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diff
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|
636 for type,names in pairs(types) do |
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|
637 for name,rrs in pairs(names) do |
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Waqas Hussain <waqas20@gmail.com>
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|
638 prune(rrs, self.time, 'soft') |
72357b1c6d88
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diff
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|
639 end |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
640 end |
72357b1c6d88
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parents:
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diff
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|
641 end |
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parents:
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diff
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|
642 else self.cache = {}; end |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
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|
643 end |
337 | 644 |
645 | |
2069
72357b1c6d88
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diff
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|
646 function resolver:query(qname, qtype, qclass) -- - - - - - - - - - -- query |
72357b1c6d88
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diff
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|
647 qname, qtype, qclass = standardize(qname, qtype, qclass) |
337 | 648 |
2069
72357b1c6d88
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diff
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|
649 if not self.server then self:adddefaultnameservers(); end |
337 | 650 |
2069
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diff
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|
651 local question = encodeQuestion(qname, qtype, qclass); |
72357b1c6d88
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diff
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|
652 local peek = self:peek (qname, qtype, qclass); |
72357b1c6d88
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diff
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|
653 if peek then return peek; end |
337 | 654 |
2069
72357b1c6d88
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|
655 local header, id = encodeHeader(); |
72357b1c6d88
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diff
changeset
|
656 --print ('query id', id, qclass, qtype, qname) |
72357b1c6d88
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|
657 local o = { |
72357b1c6d88
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diff
changeset
|
658 packet = header..question, |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
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|
659 server = self.best_server, |
72357b1c6d88
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parents:
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diff
changeset
|
660 delay = 1, |
72357b1c6d88
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diff
changeset
|
661 retry = socket.gettime() + self.delays[1] |
72357b1c6d88
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diff
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|
662 }; |
337 | 663 |
664 -- remember the query | |
2069
72357b1c6d88
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2068
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changeset
|
665 self.active[id] = self.active[id] or {}; |
72357b1c6d88
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|
666 self.active[id][question] = o; |
337 | 667 |
668 -- remember which coroutine wants the answer | |
2069
72357b1c6d88
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diff
changeset
|
669 local co = coroutine.running(); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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2068
diff
changeset
|
670 if co then |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
changeset
|
671 set(self.wanted, qclass, qtype, qname, co, true); |
72357b1c6d88
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diff
changeset
|
672 --set(self.yielded, co, qclass, qtype, qname, true); |
72357b1c6d88
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diff
changeset
|
673 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
|
674 |
2069
72357b1c6d88
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diff
changeset
|
675 self:getsocket (o.server):send (o.packet) |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
676 end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
677 |
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
|
678 function resolver:servfail(sock) |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
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|
679 -- Resend all queries for this server |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
changeset
|
680 |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
changeset
|
681 local num = self.socketset[sock] |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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2068
diff
changeset
|
682 |
72357b1c6d88
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diff
changeset
|
683 -- Socket is dead now |
72357b1c6d88
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|
684 self:voidsocket(sock); |
72357b1c6d88
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diff
changeset
|
685 |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
changeset
|
686 -- Find all requests to the down server, and retry on the next server |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
changeset
|
687 self.time = socket.gettime(); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
688 for id,queries in pairs(self.active) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
689 for question,o in pairs(queries) do |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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2068
diff
changeset
|
690 if o.server == num then -- This request was to the broken server |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
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diff
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|
691 o.server = o.server + 1 -- Use next server |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
692 if o.server > #self.server then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
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2068
diff
changeset
|
693 o.server = 1; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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|
694 end |
337 | 695 |
2069
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Waqas Hussain <waqas20@gmail.com>
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diff
changeset
|
696 o.retries = (o.retries or 0) + 1; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
697 if o.retries >= #self.server then |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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2068
diff
changeset
|
698 --print('timeout'); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
changeset
|
699 queries[question] = nil; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
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diff
changeset
|
700 else |
72357b1c6d88
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diff
changeset
|
701 local _a = self:getsocket(o.server); |
72357b1c6d88
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diff
changeset
|
702 if _a then _a:send(o.packet); end |
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Waqas Hussain <waqas20@gmail.com>
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diff
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|
703 end |
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Waqas Hussain <waqas20@gmail.com>
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diff
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|
704 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
705 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
706 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
|
707 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
708 if num == self.best_server then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
709 self.best_server = self.best_server + 1; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
710 if self.best_server > #self.server then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
711 -- Exhausted all servers, try first again |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
712 self.best_server = 1; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
713 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
714 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
|
715 end |
337 | 716 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
717 function resolver:receive(rset) -- - - - - - - - - - - - - - - - - receive |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
718 --print('receive'); print(self.socket); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
719 self.time = socket.gettime(); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
720 rset = rset or self.socket; |
337 | 721 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
722 local response; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
723 for i,sock in pairs(rset) do |
337 | 724 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
725 if self.socketset[sock] then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
726 local packet = sock:receive(); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
727 if packet then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
728 response = self:decode(packet); |
2081
b9bbb709d62e
net.dns: Be more strict about checking the DNS replies we receive
Matthew Wild <mwild1@gmail.com>
parents:
2069
diff
changeset
|
729 if response and self.active[response.header.id] |
b9bbb709d62e
net.dns: Be more strict about checking the DNS replies we receive
Matthew Wild <mwild1@gmail.com>
parents:
2069
diff
changeset
|
730 and self.active[response.header.id][response.question.raw] then |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
731 --print('received response'); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
732 --self.print(response); |
337 | 733 |
2082
1381b2071c2e
net.dns: Be more strict about the records we cache
Matthew Wild <mwild1@gmail.com>
parents:
2081
diff
changeset
|
734 for j,rr in pairs(response.answer) do |
1381b2071c2e
net.dns: Be more strict about the records we cache
Matthew Wild <mwild1@gmail.com>
parents:
2081
diff
changeset
|
735 if rr.name:sub(-#response.question[1].name, -1) == response.question[1].name then |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
736 self:remember(rr, response.question[1].type) |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
737 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
738 end |
337 | 739 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
740 -- retire the query |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
741 local queries = self.active[response.header.id]; |
2082
1381b2071c2e
net.dns: Be more strict about the records we cache
Matthew Wild <mwild1@gmail.com>
parents:
2081
diff
changeset
|
742 queries[response.question.raw] = nil; |
1381b2071c2e
net.dns: Be more strict about the records we cache
Matthew Wild <mwild1@gmail.com>
parents:
2081
diff
changeset
|
743 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
744 if not next(queries) then self.active[response.header.id] = nil; end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
745 if not next(self.active) then self:closeall(); end |
337 | 746 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
747 -- was the query on the wanted list? |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
748 local q = response.question; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
749 local cos = get(self.wanted, q.class, q.type, q.name); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
750 if cos then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
751 for co in pairs(cos) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
752 set(self.yielded, co, q.class, q.type, q.name, nil); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
753 if coroutine.status(co) == "suspended" then coroutine.resume(co); end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
754 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
755 set(self.wanted, q.class, q.type, q.name, nil); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
756 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
757 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
758 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
759 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
760 end |
337 | 761 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
762 return response; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
763 end |
337 | 764 |
765 | |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
766 function resolver:feed(sock, packet) |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
767 --print('receive'); print(self.socket); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
768 self.time = socket.gettime(); |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
769 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
770 local response = self:decode(packet); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
771 if response then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
772 --print('received response'); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
773 --self.print(response); |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
774 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
775 for i,section in pairs({ 'answer', 'authority', 'additional' }) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
776 for j,rr in pairs(response[section]) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
777 self:remember(rr, response.question[1].type); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
778 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
779 end |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
780 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
781 -- retire the query |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
782 local queries = self.active[response.header.id]; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
783 if queries[response.question.raw] then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
784 queries[response.question.raw] = nil; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
785 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
786 if not next(queries) then self.active[response.header.id] = nil; end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
787 if not next(self.active) then self:closeall(); end |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
788 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
789 -- was the query on the wanted list? |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
790 local q = response.question[1]; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
791 if q then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
792 local cos = get(self.wanted, q.class, q.type, q.name); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
793 if cos then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
794 for co in pairs(cos) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
795 set(self.yielded, co, q.class, q.type, q.name, nil); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
796 if coroutine.status(co) == "suspended" then coroutine.resume(co); end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
797 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
798 set(self.wanted, q.class, q.type, q.name, nil); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
799 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
800 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
801 end |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
802 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
803 return response; |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
804 end |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
805 |
1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
806 function resolver:cancel(data) |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
807 local cos = get(self.wanted, unpack(data, 1, 3)); |
1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
808 if cos then |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
809 cos[data[4]] = nil; |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
810 end |
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
811 end |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
812 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
813 function resolver:pulse() -- - - - - - - - - - - - - - - - - - - - - pulse |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
814 --print(':pulse'); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
815 while self:receive() do end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
816 if not next(self.active) then return nil; end |
337 | 817 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
818 self.time = socket.gettime(); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
819 for id,queries in pairs(self.active) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
820 for question,o in pairs(queries) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
821 if self.time >= o.retry then |
337 | 822 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
823 o.server = o.server + 1; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
824 if o.server > #self.server then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
825 o.server = 1; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
826 o.delay = o.delay + 1; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
827 end |
337 | 828 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
829 if o.delay > #self.delays then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
830 --print('timeout'); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
831 queries[question] = nil; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
832 if not next(queries) then self.active[id] = nil; end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
833 if not next(self.active) then return nil; end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
834 else |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
835 --print('retry', o.server, o.delay); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
836 local _a = self.socket[o.server]; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
837 if _a then _a:send(o.packet); end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
838 o.retry = self.time + self.delays[o.delay]; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
839 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
840 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
841 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
842 end |
337 | 843 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
844 if next(self.active) then return true; end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
845 return nil; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
846 end |
337 | 847 |
848 | |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
849 function resolver:lookup(qname, qtype, qclass) -- - - - - - - - - - lookup |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
850 self:query (qname, qtype, qclass) |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
851 while self:pulse() do socket.select(self.socket, nil, 4); end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
852 --print(self.cache); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
853 return self:peek(qname, qtype, qclass); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
854 end |
337 | 855 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
856 function resolver:lookupex(handler, qname, qtype, qclass) -- - - - - - - - - - lookup |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
857 return self:peek(qname, qtype, qclass) or self:query(qname, qtype, qclass); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
858 end |
337 | 859 |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
860 |
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
861 --print ---------------------------------------------------------------- print |
337 | 862 |
863 | |
864 local hints = { -- - - - - - - - - - - - - - - - - - - - - - - - - - - hints | |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
865 qr = { [0]='query', 'response' }, |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
866 opcode = { [0]='query', 'inverse query', 'server status request' }, |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
867 aa = { [0]='non-authoritative', 'authoritative' }, |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
868 tc = { [0]='complete', 'truncated' }, |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
869 rd = { [0]='recursion not desired', 'recursion desired' }, |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
870 ra = { [0]='recursion not available', 'recursion available' }, |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
871 z = { [0]='(reserved)' }, |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
872 rcode = { [0]='no error', 'format error', 'server failure', 'name error', 'not implemented' }, |
337 | 873 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
874 type = dns.type, |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
875 class = dns.class |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
876 }; |
337 | 877 |
878 | |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
879 local function hint(p, s) -- - - - - - - - - - - - - - - - - - - - - - hint |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
880 return (hints[s] and hints[s][p[s]]) or ''; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
881 end |
337 | 882 |
883 | |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
884 function resolver.print(response) -- - - - - - - - - - - - - resolver.print |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
885 for s,s in pairs { 'id', 'qr', 'opcode', 'aa', 'tc', 'rd', 'ra', 'z', |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
886 'rcode', 'qdcount', 'ancount', 'nscount', 'arcount' } do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
887 print( string.format('%-30s', 'header.'..s), response.header[s], hint(response.header, s) ); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
888 end |
337 | 889 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
890 for i,question in ipairs(response.question) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
891 print(string.format ('question[%i].name ', i), question.name); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
892 print(string.format ('question[%i].type ', i), question.type); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
893 print(string.format ('question[%i].class ', i), question.class); |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
894 end |
337 | 895 |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
896 local common = { name=1, type=1, class=1, ttl=1, rdlength=1, rdata=1 }; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
897 local tmp; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
898 for s,s in pairs({'answer', 'authority', 'additional'}) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
899 for i,rr in pairs(response[s]) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
900 for j,t in pairs({ 'name', 'type', 'class', 'ttl', 'rdlength' }) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
901 tmp = string.format('%s[%i].%s', s, i, t); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
902 print(string.format('%-30s', tmp), rr[t], hint(rr, t)); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
903 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
904 for j,t in pairs(rr) do |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
905 if not common[j] then |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
906 tmp = string.format('%s[%i].%s', s, i, j); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
907 print(string.format('%-30s %s', tostring(tmp), tostring(t))); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
908 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
909 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
910 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
911 end |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
912 end |
337 | 913 |
914 | |
915 -- module api ------------------------------------------------------ module api | |
916 | |
917 | |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
918 local function resolve(func, ...) -- - - - - - - - - - - - - - resolver_get |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
919 return func(dns._resolver, ...); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
920 end |
337 | 921 |
922 | |
923 function dns.resolver () -- - - - - - - - - - - - - - - - - - - - - resolver | |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
924 -- this function seems to be redundant with resolver.new () |
337 | 925 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
926 local r = { active = {}, cache = {}, unsorted = {}, wanted = {}, yielded = {}, best_server = 1 }; |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
927 setmetatable (r, resolver); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
928 setmetatable (r.cache, cache_metatable); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
929 setmetatable (r.unsorted, { __mode = 'kv' }); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
930 return r; |
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
931 end |
337 | 932 |
933 | |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
934 function dns.lookup(...) -- - - - - - - - - - - - - - - - - - - - - lookup |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
935 return resolve(resolver.lookup, ...); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
936 end |
337 | 937 |
938 | |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
939 function dns.purge(...) -- - - - - - - - - - - - - - - - - - - - - - purge |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
940 return resolve(resolver.purge, ...); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
941 end |
337 | 942 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
943 function dns.peek(...) -- - - - - - - - - - - - - - - - - - - - - - - peek |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
944 return resolve(resolver.peek, ...); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
945 end |
337 | 946 |
947 | |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
948 function dns.query(...) -- - - - - - - - - - - - - - - - - - - - - - query |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
949 return resolve(resolver.query, ...); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
950 end |
337 | 951 |
2069
72357b1c6d88
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Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
952 function dns.feed(...) -- - - - - - - - - - - - - - - - - - - - - - feed |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
953 return resolve(resolver.feed, ...); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
954 end |
869
09019c452709
net.dns: Add methods necessary for allowing non-blocking DNS lookups
Matthew Wild <mwild1@gmail.com>
parents:
759
diff
changeset
|
955 |
1202
e69fafc14491
net.dns: Add support for cancelling a coroutine-based request
Matthew Wild <mwild1@gmail.com>
parents:
896
diff
changeset
|
956 function dns.cancel(...) -- - - - - - - - - - - - - - - - - - - - - - cancel |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
957 return resolve(resolver.cancel, ...); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
958 end |
337 | 959 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
960 function dns:socket_wrapper_set(...) -- - - - - - - - - socket_wrapper_set |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
961 return resolve(resolver.socket_wrapper_set, ...); |
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
962 end |
337 | 963 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
964 dns._resolver = dns.resolver(); |
337 | 965 |
2069
72357b1c6d88
net.dns: Fixed indentation and coding style.
Waqas Hussain <waqas20@gmail.com>
parents:
2068
diff
changeset
|
966 return dns; |