prosody
7c71c6eb29a6
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 9953:7c71c6eb29a6

Merge 0.11->trunk
author Kim Alvefur <zash@zash.se>
date Sat, 13 Apr 2019 18:23:02 +0200
parent 9691:e11e076f0eb8
child 10386:cf93a951da37
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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 local unpack = table.unpack or unpack; -- luacheck: ignore 113
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4
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5 local methods = {};
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6 local resolver_mt = { __index = methods };
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7
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8 -- Find the next target to connect to, and
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9 -- pass it to cb()
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10 function methods:next(cb)
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11 if self.targets then
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12 if #self.targets == 0 then
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13 cb(nil);
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14 return;
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15 end
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16 local next_target = table.remove(self.targets, 1);
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17 cb(unpack(next_target, 1, 4));
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18 return;
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19 end
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20
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21 local targets = {};
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22 local n = 2;
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23 local function ready()
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24 n = n - 1;
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25 if n > 0 then return; end
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26 self.targets = targets;
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27 self:next(cb);
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28 end
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29
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30 local is_ip = inet_pton(self.hostname);
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31 if is_ip then
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32 if #is_ip == 16 then
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33 cb(self.conn_type.."6", self.hostname, self.port, self.extra);
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34 elseif #is_ip == 4 then
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35 cb(self.conn_type.."4", self.hostname, self.port, self.extra);
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36 end
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37 return;
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38 end
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39
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40 -- Resolve DNS to target list
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41 local dns_resolver = adns.resolver();
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42 dns_resolver:lookup(function (answer)
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43 if answer then
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44 for _, record in ipairs(answer) do
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45 table.insert(targets, { self.conn_type.."4", record.a, self.port, self.extra });
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46 end
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47 end
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48 ready();
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49 end, self.hostname, "A", "IN");
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50
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51 dns_resolver:lookup(function (answer)
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52 if answer then
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53 for _, record in ipairs(answer) do
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54 table.insert(targets, { self.conn_type.."6", record.aaaa, self.port, self.extra });
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55 end
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56 end
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57 ready();
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58 end, self.hostname, "AAAA", "IN");
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59 end
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60
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61 local function new(hostname, port, conn_type, extra)
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62 return setmetatable({
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63 hostname = hostname;
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64 port = port;
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65 conn_type = conn_type or "tcp";
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66 extra = extra;
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67 }, resolver_mt);
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68 end
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69
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70 return {
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71 new = new;
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72 };