prosody
1ef1f6c43c5b
net/resolvers/service.lua

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net/resolvers/service.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 10440:1ee87b4979c2
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1 local adns = require "net.adns";
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2 local basic = require "net.resolvers.basic";
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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 self.resolver = basic.new(unpack(next_target, 1, 4));
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19 self.resolver:next(function (...)
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20 if ... == nil then
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21 self:next(cb);
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22 else
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23 cb(...);
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24 end
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25 end);
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26 return;
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27 end
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28
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29 if not self.hostname then
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30 -- FIXME report IDNA error
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31 cb(nil);
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32 return;
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33 end
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34
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35 local targets = {};
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36 local function ready()
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37 self.targets = targets;
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38 self:next(cb);
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39 end
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40
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41 -- Resolve DNS to target list
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42 local dns_resolver = adns.resolver();
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43 dns_resolver:lookup(function (answer, err)
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44 if not answer and not err then
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45 -- net.adns returns nil if there are zero records or nxdomain
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46 answer = {};
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47 end
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48 if answer then
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49 if #answer == 0 then
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50 if self.extra and self.extra.default_port then
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51 table.insert(targets, { self.hostname, self.extra.default_port, self.conn_type, self.extra });
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52 end
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53 ready();
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54 return;
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55 end
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56
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57 if #answer == 1 and answer[1].srv.target == "." then -- No service here
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58 ready();
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59 return;
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60 end
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61
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62 table.sort(answer, function (a, b) return a.srv.priority < b.srv.priority end);
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63 for _, record in ipairs(answer) do
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64 table.insert(targets, { record.srv.target, record.srv.port, self.conn_type, self.extra });
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65 end
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66 end
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67 ready();
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68 end, "_" .. self.service .. "._" .. self.conn_type .. "." .. self.hostname, "SRV", "IN");
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69 end
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70
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71 local function new(hostname, service, conn_type, extra)
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72 return setmetatable({
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73 hostname = idna_to_ascii(hostname);
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74 service = service;
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75 conn_type = conn_type or "tcp";
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76 extra = extra;
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77 }, resolver_mt);
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78 end
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79
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80 return {
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81 new = new;
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82 };