Software /
code /
prosody
File
net/resolvers/service.lua @ 11712:d117b92fd8e4 0.11 0.11.10
MUC: Fix logic for access to affiliation lists
Fixes https://prosody.im/security/advisory_20210722/
Backs out 4d7b925652d9
author | Kim Alvefur <zash@zash.se> |
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date | Thu, 22 Jul 2021 17:18:39 +0200 |
parent | 10400:4c2d789a106b |
child | 10401:1ef1f6c43c5b |
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local adns = require "net.adns"; local basic = require "net.resolvers.basic"; local idna_to_ascii = require "util.encodings".idna.to_ascii; local methods = {}; local resolver_mt = { __index = methods }; -- Find the next target to connect to, and -- pass it to cb() function methods:next(cb) if self.targets then if #self.targets == 0 then cb(nil); return; end local next_target = table.remove(self.targets, 1); self.resolver = basic.new(unpack(next_target, 1, 4)); self.resolver:next(function (...) if ... == nil then self:next(cb); else cb(...); end end); return; end if not self.hostname then -- FIXME report IDNA error cb(nil); return; end local targets = {}; local function ready() self.targets = targets; self:next(cb); end -- Resolve DNS to target list local dns_resolver = adns.resolver(); dns_resolver:lookup(function (answer) if answer then if #answer == 0 then if self.extra and self.extra.default_port then table.insert(targets, { self.hostname, self.extra.default_port, self.conn_type, self.extra }); end ready(); return; end if #answer == 1 and answer[1].srv.target == "." then -- No service here ready(); return; end table.sort(answer, function (a, b) return a.srv.priority < b.srv.priority end); for _, record in ipairs(answer) do table.insert(targets, { record.srv.target, record.srv.port, self.conn_type, self.extra }); end end ready(); end, "_" .. self.service .. "._" .. self.conn_type .. "." .. self.hostname, "SRV", "IN"); end local function new(hostname, service, conn_type, extra) return setmetatable({ hostname = idna_to_ascii(hostname); service = service; conn_type = conn_type or "tcp"; extra = extra; }, resolver_mt); end return { new = new; };