prosody
18685a5e362e
net/resolvers/service.lua

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net/resolvers/service.lua @ 10380:18685a5e362e

mod_dialback: Fix potential traceback in case of missing addressing Not tested. Assuming nothing good comes from continuing the program flow after this. The connection should get closed and the event gets aborted by a traceback anyways.
author Kim Alvefur <zash@zash.se>
date Sat, 02 Nov 2019 15:40:20 +0100
parent 10121:33f287519bf6
child 10386:cf93a951da37
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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 unpack = table.unpack or unpack; -- luacheck: ignore 113
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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 self.resolver = basic.new(unpack(next_target, 1, 4));
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18 self.resolver:next(function (...)
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19 if ... == nil then
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20 self:next(cb);
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21 else
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22 cb(...);
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23 end
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24 end);
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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 function ready()
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30 self.targets = targets;
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31 self:next(cb);
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32 end
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33
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34 -- Resolve DNS to target list
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35 local dns_resolver = adns.resolver();
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36 dns_resolver:lookup(function (answer, err)
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37 if not answer and not err then
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38 -- net.adns returns nil if there are zero records or nxdomain
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39 answer = {};
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40 end
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41 if answer then
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42 if #answer == 0 then
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43 if self.extra and self.extra.default_port then
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44 table.insert(targets, { self.hostname, self.extra.default_port, self.conn_type, self.extra });
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45 end
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46 ready();
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47 return;
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48 end
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49
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50 if #answer == 1 and answer[1].srv.target == "." then -- No service here
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51 ready();
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52 return;
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53 end
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54
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55 table.sort(answer, function (a, b) return a.srv.priority < b.srv.priority end);
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56 for _, record in ipairs(answer) do
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57 table.insert(targets, { record.srv.target, record.srv.port, self.conn_type, self.extra });
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58 end
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59 end
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60 ready();
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61 end, "_" .. self.service .. "._" .. self.conn_type .. "." .. self.hostname, "SRV", "IN");
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62 end
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63
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64 local function new(hostname, service, conn_type, extra)
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65 return setmetatable({
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66 hostname = hostname;
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67 service = service;
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68 conn_type = conn_type or "tcp";
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69 extra = extra;
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70 }, resolver_mt);
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71 end
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72
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73 return {
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74 new = new;
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75 };