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net/resolvers/basic.lua @ 9254:2ffbcad8ec50
mod_vcard_legacy: Add support for address field
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 21 Aug 2018 16:34:46 +0200 |
parent | 8775:ae7cf011e46a |
child | 9496:4ac3103787cc |
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1 local adns = require "net.adns"; |
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2 local inet_pton = require "util.net".pton; |
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3 |
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4 local methods = {}; |
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5 local resolver_mt = { __index = methods }; |
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6 |
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7 -- Find the next target to connect to, and |
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8 -- pass it to cb() |
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9 function methods:next(cb) |
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10 if self.targets then |
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11 if #self.targets == 0 then |
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12 cb(nil); |
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13 return; |
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14 end |
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15 local next_target = table.remove(self.targets, 1); |
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16 cb(unpack(next_target, 1, 4)); |
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17 return; |
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18 end |
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19 |
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20 local targets = {}; |
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21 local n = 2; |
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22 local function ready() |
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23 n = n - 1; |
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24 if n > 0 then return; end |
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25 self.targets = targets; |
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26 self:next(cb); |
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27 end |
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28 |
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29 local is_ip = inet_pton(self.hostname); |
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30 if is_ip then |
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31 if #is_ip == 16 then |
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32 cb(self.conn_type.."6", self.hostname, self.port, self.extra); |
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33 elseif #is_ip == 4 then |
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34 cb(self.conn_type, self.hostname, self.port, self.extra); |
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35 end |
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36 return; |
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37 end |
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38 |
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39 -- Resolve DNS to target list |
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40 local dns_resolver = adns.resolver(); |
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41 dns_resolver:lookup(function (answer) |
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42 if answer then |
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43 for _, record in ipairs(answer) do |
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44 table.insert(targets, { self.conn_type, record.a, self.port, self.extra }); |
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45 end |
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46 end |
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47 ready(); |
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48 end, self.hostname, "A", "IN"); |
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49 |
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50 dns_resolver:lookup(function (answer) |
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51 if answer then |
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52 for _, record in ipairs(answer) do |
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53 table.insert(targets, { self.conn_type.."6", record.aaaa, self.port, self.extra }); |
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54 end |
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55 end |
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56 ready(); |
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57 end, self.hostname, "AAAA", "IN"); |
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58 end |
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59 |
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60 local function new(hostname, port, conn_type, extra) |
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61 return setmetatable({ |
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62 hostname = hostname; |
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63 port = port; |
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64 conn_type = conn_type or "tcp"; |
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65 extra = extra; |
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66 }, resolver_mt); |
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67 end |
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68 |
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69 return { |
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70 new = new; |
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71 }; |