prosody
1ef1f6c43c5b
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 10401:1ef1f6c43c5b

Merge 0.11->trunk
author Kim Alvefur <zash@zash.se>
date Fri, 08 Nov 2019 00:58:03 +0100
parent 10386:cf93a951da37
parent 10400:4c2d789a106b
child 10438:55490be0dc29
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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 idna_to_ascii = require "util.encodings".idna.to_ascii;
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4 local unpack = table.unpack or unpack; -- luacheck: ignore 113
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5
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6 local methods = {};
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7 local resolver_mt = { __index = methods };
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8
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9 -- Find the next target to connect to, and
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10 -- pass it to cb()
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11 function methods:next(cb)
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12 if self.targets then
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13 if #self.targets == 0 then
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14 cb(nil);
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15 return;
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16 end
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17 local next_target = table.remove(self.targets, 1);
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18 cb(unpack(next_target, 1, 4));
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19 return;
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20 end
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21
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22 if not self.hostname then
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23 -- FIXME report IDNA error
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24 cb(nil);
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25 return;
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26 end
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27
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28 local targets = {};
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29 local n = 2;
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30 local function ready()
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31 n = n - 1;
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32 if n > 0 then return; end
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33 self.targets = targets;
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34 self:next(cb);
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35 end
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36
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37 local is_ip = inet_pton(self.hostname);
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38 if is_ip then
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39 if #is_ip == 16 then
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40 cb(self.conn_type.."6", self.hostname, self.port, self.extra);
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41 elseif #is_ip == 4 then
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42 cb(self.conn_type.."4", self.hostname, self.port, self.extra);
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43 end
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44 return;
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45 end
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46
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47 -- Resolve DNS to target list
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48 local dns_resolver = adns.resolver();
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49 dns_resolver:lookup(function (answer)
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50 if answer then
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51 for _, record in ipairs(answer) do
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52 table.insert(targets, { self.conn_type.."4", record.a, self.port, self.extra });
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53 end
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54 end
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55 ready();
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56 end, self.hostname, "A", "IN");
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57
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58 dns_resolver:lookup(function (answer)
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59 if answer then
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60 for _, record in ipairs(answer) do
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61 table.insert(targets, { self.conn_type.."6", record.aaaa, self.port, self.extra });
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62 end
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63 end
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64 ready();
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65 end, self.hostname, "AAAA", "IN");
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66 end
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67
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68 local function new(hostname, port, conn_type, extra)
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69 return setmetatable({
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70 hostname = idna_to_ascii(hostname);
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71 port = port;
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72 conn_type = conn_type or "tcp";
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73 extra = extra;
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74 }, resolver_mt);
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75 end
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76
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77 return {
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78 new = new;
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79 };