prosody
fcfc8f4d14a8
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 10437:fcfc8f4d14a8 0.11

net.resolvers.basic: Fix resolution of IPv6 literals (in brackets) (fixes #1459)
author Kim Alvefur <zash@zash.se>
date Sun, 24 Nov 2019 04:26:44 +0100
parent 10436:0d702ec77f0c
child 10438:55490be0dc29
child 10439:97c0f5fe5f41
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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
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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 if not self.hostname then
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22 -- FIXME report IDNA error
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23 cb(nil);
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24 return;
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25 end
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26
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27 local targets = {};
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28 local n = 2;
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29 local function ready()
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30 n = n - 1;
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31 if n > 0 then return; end
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32 self.targets = targets;
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33 self:next(cb);
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34 end
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35
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36 -- Resolve DNS to target list
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37 local dns_resolver = adns.resolver();
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38 dns_resolver:lookup(function (answer)
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39 if answer then
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40 for _, record in ipairs(answer) do
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41 table.insert(targets, { self.conn_type.."4", record.a, self.port, self.extra });
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42 end
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43 end
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44 ready();
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45 end, self.hostname, "A", "IN");
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46
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47 dns_resolver:lookup(function (answer)
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48 if answer then
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49 for _, record in ipairs(answer) do
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50 table.insert(targets, { self.conn_type.."6", record.aaaa, self.port, self.extra });
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51 end
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52 end
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53 ready();
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54 end, self.hostname, "AAAA", "IN");
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55 end
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56
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57 local function new(hostname, port, conn_type, extra)
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58 local ascii_host = idna_to_ascii(hostname);
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59 local targets = nil;
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60
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61 local is_ip = inet_pton(hostname);
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62 if not is_ip and hostname:sub(1,1) == '[' then
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63 is_ip = inet_pton(hostname:sub(2,-2));
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64 end
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65 if is_ip then
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66 if #is_ip == 16 then
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67 targets = { { conn_type.."6", hostname, port, extra } };
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68 elseif #is_ip == 4 then
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69 targets = { { conn_type.."4", hostname, port, extra } };
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70 end
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71 end
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72
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73 return setmetatable({
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74 hostname = ascii_host;
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75 port = port;
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76 conn_type = conn_type or "tcp";
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77 extra = extra;
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78 targets = targets;
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79 }, resolver_mt);
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80 end
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81
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82 return {
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83 new = new;
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84 };