prosody
d13540d83b8e
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 9356:d13540d83b8e

mod_scansion_record: Record into "scansion" instead of per VirtualHost
author Kim Alvefur <zash@zash.se>
date Sat, 22 Sep 2018 14:10:16 +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 };