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mod_register_dnsbl/mod_register_dnsbl.lua @ 3436:12c7c0d7e1b0
mod_pubsub_text_interface/README: Fix typo (thanks perflyst)
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 07 Jan 2019 19:46:04 +0100 |
parent | 2892:bf9fc41bf7ad |
child | 4118:82482e7e92cb |
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local adns = require "net.adns"; local async = require "util.async"; local inet_pton = require "util.net".pton; local to_hex = require "util.hex".to; local rbl = module:get_option_string("registration_rbl"); local function reverse(ip, suffix) local n, err = inet_pton(ip); if not n then return n, err end if #n == 4 then local a,b,c,d = n:byte(1,4); return ("%d.%d.%d.%d.%s"):format(d,c,b,a, suffix); elseif #n == 16 then return to_hex(n):reverse():gsub("%x", "%1.") .. suffix; end end module:hook("user-registering", function (event) local session, ip = event.session, event.ip; if not ip then session.log("debug", "Unable to check DNSBL when IP is unknown"); return; end local rbl_ip, err = reverse(ip, rbl); if not rbl_ip then session.log("debug", "Unable to check DNSBL for ip %s: %s", ip, err); return; end local wait, done = async.waiter(); adns.lookup(function (reply) if reply and reply[1] and reply[1].a then session.log("debug", "DNSBL response: %s IN A %s", rbl_ip, reply[1].a); session.log("info", "Blocking %s from registering %s (dnsbl hit)", ip, event.username); event.allowed = false; event.reason = "Blocked by DNSBL"; end done(); end, rbl_ip); wait(); end);