Mercurial > prosody-modules

annotate mod_register_dnsbl/mod_register_dnsbl.lua @ 2891:84670bac7348

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mod_register_dnsbl: Use util.net for IP address parsing
author Kim Alvefur <zash@zash.se>
date Fri, 23 Feb 2018 21:59:28 +0100
parents 6412595e2046
children bf9fc41bf7ad
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rev   line source
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0890c4860f14 mod_register_dnsbl: Initial commit of module to check users registering against an DNS block list
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1 local adns = require "net.adns";
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2 local async = require "util.async";
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3 local inet_pton = require "util.net".pton;
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4
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5 local rbl = module:get_option_string("registration_rbl");
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6
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7 local function reverse(ip, suffix)
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8 local n, err = inet_pton(ip);
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9 if not n then return n, err end
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10 if #n == 4 then
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11 local a,b,c,d = n:byte(1,4);
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12 return ("%d.%d.%d.%d.%s"):format(d,c,b,a, suffix);
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13 end
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14 end
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15
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16 module:hook("user-registering", function (event)
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17 local session, ip = event.session, event.ip;
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18 if not ip then
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19 session.log("debug", "Unable to check DNSBL when IP is unknown");
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20 return;
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21 end
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22 local rbl_ip, err = reverse(ip, rbl);
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23 if not rbl_ip then
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24 session.log("debug", "Unable to check DNSBL for ip %s: %s", ip, err);
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25 return;
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26 end
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27
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28 local wait, done = async.waiter();
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29 adns.lookup(function (reply)
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30 if reply and reply[1] and reply[1].a then
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31 session.log("debug", "DNSBL response: %s IN A %s", rbl_ip, reply[1].a);
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32 session.log("info", "Blocking %s from registering %s (dnsbl hit)", ip, event.username);
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33 event.allowed = false;
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34 event.reason = "Blocked by DNSBL";
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35 end
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36 done();
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37 end, rbl_ip);
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38 wait();
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39 end);