prosody
f2c9abc71f08
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 10441:f2c9abc71f08

Merge 0.11->trunk
author Kim Alvefur <zash@zash.se>
date Sun, 24 Nov 2019 04:46:36 +0100
parent 10438:55490be0dc29
parent 10439:97c0f5fe5f41
child 10484:b13a31cea7d9
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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 inet_ntop = require "util.net".ntop;
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4 local idna_to_ascii = require "util.encodings".idna.to_ascii;
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5 local unpack = table.unpack or unpack; -- luacheck: ignore 113
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6
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7 local methods = {};
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8 local resolver_mt = { __index = methods };
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9
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10 -- Find the next target to connect to, and
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11 -- pass it to cb()
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12 function methods:next(cb)
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13 if self.targets then
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14 if #self.targets == 0 then
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15 cb(nil);
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16 return;
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17 end
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18 local next_target = table.remove(self.targets, 1);
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19 cb(unpack(next_target, 1, 4));
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20 return;
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21 end
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22
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23 if not self.hostname then
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24 -- FIXME report IDNA error
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25 cb(nil);
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26 return;
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27 end
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28
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29 local targets = {};
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30 local n = 2;
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31 local function ready()
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32 n = n - 1;
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33 if n > 0 then return; end
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34 self.targets = targets;
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35 self:next(cb);
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36 end
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37
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38 -- Resolve DNS to target list
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39 local dns_resolver = adns.resolver();
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40 dns_resolver:lookup(function (answer)
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41 if answer then
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42 for _, record in ipairs(answer) do
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43 table.insert(targets, { self.conn_type.."4", record.a, self.port, self.extra });
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44 end
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45 end
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46 ready();
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47 end, self.hostname, "A", "IN");
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48
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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.."6", record.aaaa, 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, "AAAA", "IN");
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57 end
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58
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59 local function new(hostname, port, conn_type, extra)
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60 local ascii_host = idna_to_ascii(hostname);
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61 local targets = nil;
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62
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63 local is_ip = inet_pton(hostname);
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64 if not is_ip and hostname:sub(1,1) == '[' then
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65 is_ip = inet_pton(hostname:sub(2,-2));
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66 end
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67 if is_ip then
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68 hostname = inet_ntop(is_ip);
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69 if #is_ip == 16 then
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70 targets = { { conn_type.."6", hostname, port, extra } };
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71 elseif #is_ip == 4 then
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72 targets = { { conn_type.."4", hostname, port, extra } };
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73 end
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74 end
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75
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76 return setmetatable({
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77 hostname = ascii_host;
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78 port = port;
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79 conn_type = conn_type or "tcp";
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80 extra = extra;
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81 targets = targets;
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82 }, resolver_mt);
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83 end
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84
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85 return {
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86 new = new;
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87 };