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annotate mod_muc_limits/mod_muc_limits.lua @ 4813:0a257d1402c3

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mod_muc_rtbl: Optimize case with zero hashes On the assumption that during quiet times between torrents of spam, the hash set would be empty. There would be no point in doing the operations and hashes to check for a match in that case.
author Kim Alvefur <zash@zash.se>
date Mon, 06 Dec 2021 18:19:19 +0100
parents 2b10e51d85a6
children 731ba9400c10
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1057
0b41122b19f9 mod_muc_limits: Abort loading on non-MUC hosts (thanks Ge0rG)
Matthew Wild <mwild1@gmail.com>
parents: 1042
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1
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163967467308 mod_muc_limits: Update to work with both the new and the old MUC API
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parents: 1428
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2 local mod_muc = module:depends"muc";
163967467308 mod_muc_limits: Update to work with both the new and the old MUC API
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3 local rooms = rawget(mod_muc, "rooms"); -- Old MUC API
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a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
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4
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5fd0860c86cd mod_muc_limits: Allow stanzas from affiliated users even if they are not in the room
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parents: 1040
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5 local jid_split, jid_bare = require "util.jid".split, require "util.jid".bare;
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6 local st = require "util.stanza";
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7 local new_throttle = require "util.throttle".create;
1038
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
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parents: 1036
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8 local t_insert, t_concat = table.insert, table.concat;
554
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9
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14f39769c9e0 mod_muc_limits: Echo any MUC <x> or <body> in the error reply (required to make Gajim display the error)
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parents: 556
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10 local xmlns_muc = "http://jabber.org/protocol/muc";
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11
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a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
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12 local period = math.max(module:get_option_number("muc_event_rate", 0.5), 0);
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13 local burst = math.max(module:get_option_number("muc_burst_factor", 6), 1);
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14
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a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
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parents: 1035
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15 local max_nick_length = module:get_option_number("muc_max_nick_length", 23); -- Default chosen through scientific methods
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2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
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parents: 3964
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16 local join_only = module:get_option_boolean("muc_limit_joins_only", false);
1038
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
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parents: 1036
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17 local dropped_count = 0;
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18 local dropped_jids;
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19
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
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20 local function log_dropped()
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21 module:log("warn", "Dropped %d stanzas from %d JIDs: %s", dropped_count, #dropped_jids, t_concat(dropped_jids, ", "));
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22 dropped_count = 0;
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23 dropped_jids = nil;
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parents: 1036
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24 end
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a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
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parents: 1035
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25
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26 local function handle_stanza(event)
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27 local origin, stanza = event.origin, event.stanza;
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2356ad05fdb6 mod_muc_limits: Don't limit room leaving
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parents: 554
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28 if stanza.name == "presence" and stanza.attr.type == "unavailable" then -- Don't limit room leaving
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parents: 554
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29 return;
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30 end
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31 local dest_room, dest_host, dest_nick = jid_split(stanza.attr.to);
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32 local room = event.room or rooms[dest_room.."@"..dest_host];
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33 if not room then return; end
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34 local from_jid = stanza.attr.from;
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9be9dd434813 mod_muc_limits: Simplify bypass for affiliated users
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parents: 3417
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35 if room:get_affiliation(jid_bare(from_jid)) then
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36 module:log("debug", "Skipping stanza from affiliated user...");
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37 return;
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1255de347dd4 mod_muc_limits: Fix traceback on presence sent to the room's bare JID
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parents: 1057
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38 elseif dest_nick and max_nick_length and stanza.name == "presence" and not room._occupants[stanza.attr.to] and #dest_nick > max_nick_length then
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a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
Matthew Wild <mwild1@gmail.com>
parents: 1035
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39 module:log("debug", "Forbidding long (%d bytes) nick in %s", #dest_nick, dest_room)
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parents: 1035
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40 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your nick name is too long, please use a shorter one")
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parents: 1035
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41 :up():tag("x", { xmlns = xmlns_muc }));
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parents: 1035
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42 return true;
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43 end
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44 local throttle = room.throttle;
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45 if not room.throttle then
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46 throttle = new_throttle(period*burst, burst);
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47 room.throttle = throttle;
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48 end
3188
5c3f3f5a4377 Backed out parts of changeset a81456a13797
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parents: 3098
diff changeset
49 if not throttle:poll(1) then
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Matthew Wild <mwild1@gmail.com>
parents: 1036
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50 module:log("debug", "Dropping stanza for %s@%s from %s, over rate limit", dest_room, dest_host, from_jid);
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parents: 1036
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51 if not dropped_jids then
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parents: 1036
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52 dropped_jids = { [from_jid] = true, from_jid };
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53 module:add_timer(5, log_dropped);
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parents: 1036
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54 elseif not dropped_jids[from_jid] then
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parents: 1036
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55 dropped_jids[from_jid] = true;
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parents: 1036
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56 t_insert(dropped_jids, from_jid);
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parents: 1036
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57 end
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parents: 1036
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58 dropped_count = dropped_count + 1;
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7d2d440e2fa5 mod_muc_limits: Just drop error stanzas instead of bouncing them with more error stanzas
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parents: 1058
diff changeset
59 if stanza.attr.type == "error" then -- We don't want to bounce errors
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60 return true;
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parents: 1058
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61 end
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62 local reply = st.error_reply(stanza, "wait", "policy-violation", "The room is currently overactive, please try again later");
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63 local body = stanza:get_child_text("body");
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parents: 556
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64 if body then
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parents: 556
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65 reply:up():tag("body"):text(body):up();
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66 end
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parents: 556
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67 local x = stanza:get_child("x", xmlns_muc);
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68 if x then
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parents: 556
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69 reply:add_child(st.clone(x));
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70 end
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parents: 556
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71 origin.send(reply);
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72 return true;
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73 end
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parents:
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74 end
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parents:
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75
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parents: 3418
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76 if rooms then
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77 function module.unload()
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Matthew Wild <mwild1@gmail.com>
parents: 3449
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78 for room_jid, room in pairs(rooms) do --luacheck: ignore 213/room_jid
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79 room.throttle = nil;
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80 end
556
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parents: 555
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81 end
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parents: 555
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82
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83 module:hook("presence/full", handle_stanza, 501);
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parents: 3964
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84 if not join_only then
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85 module:hook("message/bare", handle_stanza, 501);
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86 module:hook("message/full", handle_stanza, 501);
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87 module:hook("presence/bare", handle_stanza, 501);
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parents: 3964
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88 end
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parents: 3402
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89 else
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parents: 3402
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90 module:hook("muc-occupant-pre-join", handle_stanza);
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parents: 3964
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91 if not join_only then
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parents: 3964
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92 module:hook("muc-occupant-pre-change", handle_stanza);
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parents: 3964
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93 module:hook("muc-occupant-groupchat", handle_stanza);
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94 end
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95 end