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annotate mod_smacks/mod_smacks.lua @ 684:27529031890b

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mod_host_guard: now a proper error is returned when stanzas are routed to a filtered remote server (thanks Zash)
author Marco Cirillo <maranda@lightwitch.org>
date Sun, 27 May 2012 02:44:06 +0000
parents 842a8a3b0d81
children 713c6791fbcc
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1 local st = require "util.stanza";
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2 local uuid_generate = require "util.uuid".generate;
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3
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
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4 local t_insert, t_remove = table.insert, table.remove;
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263858d40ceb mod_smacks: Fix the logic for handling outgoing stanzas and ack requests
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5 local math_min = math.min;
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6 local os_time = os.time;
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7 local tonumber, tostring = tonumber, tostring;
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bc24f58a0d39 mod_smacks: Use filters for catching incoming stanzas (more reliable and efficient), also add some logic to make compatible with the stream resumption module (coming soon)
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parents: 200
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8 local add_filter = require "util.filters".add_filter;
257
08fa42e1ab06 mod_smacks: Fixes for monkey-patched sessionmanager.destroy to handle stream resumption, and to fall back to stock destroy() if the session is not smacks-enabled.
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parents: 256
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9 local timer = require "util.timer";
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10 local datetime = require "util.datetime";
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11
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6da21a0bb018 mod_smacks: Drop back to urn:xmpp:sm:2 for now
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12 local xmlns_sm = "urn:xmpp:sm:2";
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13 local xmlns_errors = "urn:ietf:params:xml:ns:xmpp-stanzas";
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14 local xmlns_delay = "urn:xmpp:delay";
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16 local sm_attr = { xmlns = xmlns_sm };
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17
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06a78cba6499 mod_smacks: get_option+_number
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18 local resume_timeout = module:get_option_number("smacks_hibernation_time", 300);
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44b69c3d5351 mod_smacks: Fix smacks on s2s connections, but disable it by default.
Kim Alvefur <zash@zash.se>
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19 local s2s_smacks = module:get_option_boolean("smacks_enabled_s2s", false);
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842a8a3b0d81 mod_smacks: Make smacks_max_unacked_stanzas configurable
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20 local max_unacked_stanzas = module:get_option_number("smacks_max_unacked_stanzas", 0);
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64a573203c20 mod_smacks: Better logic for deciding what is a stanza and what is not, and deciding when to send ack requests
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21
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d87131b29bbd mod_smacks: Remove dependency on connlisteners (use sessions table shared by mod_c2s directly)
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22 local c2s_sessions = module:shared("/*/c2s/sessions");
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23 local session_registry = {};
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24
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parents: 590
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25 local function can_do_smacks(session, advertise_only)
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26 if session.smacks then return false, "unexpected-request", "Stream management is already enabled"; end
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28 local session_type = session.type;
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29 if session_type == "c2s" then
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30 if not(advertise_only) and not(session.resource) then -- Fail unless we're only advertising sm
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f9c73c1249cd Update smacks to urn:xmpp:sm:3. Fix typo in can_do_smacks.
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31 return false, "unexpected-request", "Client must bind a resource before enabling stream management";
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parents: 590
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32 end
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33 return true;
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34 elseif s2s_smacks and (session_type == "s2sin" or session_type == "s2sout") then
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parents: 590
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35 return true;
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parents: 590
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36 end
36003cae2370 mod_smacks: Consolidate logic for deciding whether to advertise or allow smacks for a given session, and fix an issue with not allowing s2s connections to enable smacks because of not binding a resource... (thanks xnyphs)
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parents: 590
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37 return false, "service-unavailable", "Stream management is not available for this stream";
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parents: 590
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38 end
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parents: 590
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39
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40 module:hook("stream-features",
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41 function (event)
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42 if can_do_smacks(event.origin, true) then
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57ac609444c4 mod_smacks: Only advertise stream features when a stream is authenticated, and doesn't already have smacks enabled
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43 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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44 end
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45 end);
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47 module:hook("s2s-stream-features",
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48 function (event)
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parents: 590
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49 if can_do_smacks(event.origin, true) then
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50 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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51 end
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52 end);
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53
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54 module:hook_stanza("http://etherx.jabber.org/streams", "features",
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55 function (session, stanza)
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56 if can_do_smacks(session) and stanza:get_child("sm", xmlns_sm) then
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57 session.sends2s(st.stanza("enable", sm_attr));
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58 end
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59 end);
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60
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61 local function wrap_session(session, resume)
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62 -- Overwrite process_stanza() and send()
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63 local queue;
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64 if not resume then
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65 queue = {};
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66 session.outgoing_stanza_queue = queue;
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67 session.last_acknowledged_stanza = 0;
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68 else
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69 queue = session.outgoing_stanza_queue;
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70 end
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71
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72 local _send = session.sends2s or session.send;
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73 local function new_send(stanza)
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74 local attr = stanza.attr;
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75 if attr and not attr.xmlns then -- Stanza in default stream namespace
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76 local cached_stanza = st.clone(stanza);
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77
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78 if cached_stanza and cached_stanza:get_child("delay", xmlns_delay) == nil then
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79 cached_stanza = cached_stanza:tag("delay", { xmlns = xmlns_delay, from = session.host, stamp = datetime.datetime()});
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80 end
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81
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82 queue[#queue+1] = cached_stanza;
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83 end
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84 local ok, err = _send(stanza);
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85 if ok and #queue > max_unacked_stanzas and not session.awaiting_ack then
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86 session.awaiting_ack = true;
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87 return _send(st.stanza("r", sm_attr));
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88 end
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89 return ok, err;
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90 end
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91
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92 if session.sends2s then
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93 session.sends2s = new_send;
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94 else
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95 session.send = new_send;
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96 end
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97
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98 if not resume then
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99 session.handled_stanza_count = 0;
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100 add_filter(session, "stanzas/in", function (stanza)
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101 if not stanza.attr.xmlns then
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102 session.handled_stanza_count = session.handled_stanza_count + 1;
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103 session.log("debug", "Handled %d incoming stanzas", session.handled_stanza_count);
255
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104 end
345
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105 return stanza;
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106 end);
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107 end
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108
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109 return session;
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110 end
201
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111
345
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112 module:hook_stanza(xmlns_sm, "enable", function (session, stanza)
591
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113 local ok, err, err_text = can_do_smacks(session);
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114 if not ok then
590
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115 session.log("warn", "Failed to enable smacks: %s", err_text); -- TODO: XEP doesn't say we can send error text, should it?
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116 session.send(st.stanza("failed", { xmlns = xmlns_sm }):tag(err, { xmlns = xmlns_errors}));
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117 return true;
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118 end
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119
345
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120 module:log("debug", "Enabling stream management");
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121 session.smacks = true;
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122
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123 wrap_session(session);
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124
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125 local resume_token;
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126 local resume = stanza.attr.resume;
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127 if resume == "true" or resume == "1" then
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128 resume_token = uuid_generate();
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129 session_registry[resume_token] = session;
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130 session.resumption_token = resume_token;
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131 end
576
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132 (session.sends2s or session.send)(st.stanza("enabled", { xmlns = xmlns_sm, id = resume_token, resume = resume }));
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133 return true;
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134 end, 100);
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135
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136 module:hook_stanza(xmlns_sm, "enabled", function (session, stanza)
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137 module:log("debug", "Enabling stream management");
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138 session.smacks = true;
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139
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140 wrap_session(session);
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141
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142 -- FIXME Resume?
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143
345
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144 return true;
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145 end, 100);
160
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146
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147 module:hook_stanza(xmlns_sm, "r", function (origin, stanza)
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148 if not origin.smacks then
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149 module:log("debug", "Received ack request from non-smack-enabled session");
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150 return;
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151 end
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152 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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153 -- Reply with <a>
255
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diff changeset
154 (origin.sends2s or origin.send)(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
160
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155 return true;
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156 end);
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157
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158 module:hook_stanza(xmlns_sm, "a", function (origin, stanza)
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159 if not origin.smacks then return; end
200
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diff changeset
160 origin.awaiting_ack = nil;
160
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161 -- Remove handled stanzas from outgoing_stanza_queue
258
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diff changeset
162 --log("debug", "ACK: h=%s, last=%s", stanza.attr.h or "", origin.last_acknowledged_stanza or "");
220
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diff changeset
163 local handled_stanza_count = tonumber(stanza.attr.h)-origin.last_acknowledged_stanza;
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164 local queue = origin.outgoing_stanza_queue;
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165 if handled_stanza_count > #queue then
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166 module:log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
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diff changeset
167 handled_stanza_count, #queue);
345
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168 module:log("debug", "Client h: %d, our h: %d", tonumber(stanza.attr.h), origin.last_acknowledged_stanza);
220
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diff changeset
169 for i=1,#queue do
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170 module:log("debug", "Q item %d: %s", i, tostring(queue[i]));
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diff changeset
171 end
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diff changeset
172 end
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diff changeset
173 for i=1,math_min(handled_stanza_count,#queue) do
160
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174 t_remove(origin.outgoing_stanza_queue, 1);
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175 end
220
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diff changeset
176 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
160
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177 return true;
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178 end);
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179
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180 --TODO: Optimise... incoming stanzas should be handled by a per-session
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181 -- function that has a counter as an upvalue (no table indexing for increments,
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182 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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183 -- on stanzas
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184
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185 function handle_unacked_stanzas(session)
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186 local queue = session.outgoing_stanza_queue;
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187 local error_attr = { type = "cancel" };
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188 if #queue > 0 then
202
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parents: 201
diff changeset
189 session.outgoing_stanza_queue = {};
160
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190 for i=1,#queue do
256
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parents: 255
diff changeset
191 local reply = st.reply(queue[i]);
160
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192 if reply.attr.to ~= session.full_jid then
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193 reply.attr.type = "error";
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194 reply:tag("error", error_attr)
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195 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
256
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parents: 255
diff changeset
196 core_process_stanza(session, reply);
160
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197 end
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198 end
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199 end
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200 end
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201
622
ce39df945de1 mod_smacks: Use pre-resource-unbind (0.9 feature) to fix reloadability and multiple host support
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parents: 595
diff changeset
202 module:hook("pre-resource-unbind", function (event)
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diff changeset
203 local session, err = event.session, event.error;
625
2c07bcf56a36 mod_smacks: Don't hibernate session on graceful stream close
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parents: 624
diff changeset
204 if session.smacks and err ~= "session closed" then
257
08fa42e1ab06 mod_smacks: Fixes for monkey-patched sessionmanager.destroy to handle stream resumption, and to fall back to stock destroy() if the session is not smacks-enabled.
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parents: 256
diff changeset
205 if not session.resumption_token then
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diff changeset
206 local queue = session.outgoing_stanza_queue;
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207 if #queue > 0 then
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208 module:log("warn", "Destroying session with %d unacked stanzas:", #queue);
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209 for i=1,#queue do
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210 module:log("warn", "::%s", tostring(queue[i]));
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211 end
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212 handle_unacked_stanzas(session);
160
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213 end
257
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214 else
586
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diff changeset
215 session.log("debug", "mod_smacks hibernating session for up to %d seconds", resume_timeout);
345
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216 local hibernate_time = os_time(); -- Track the time we went into hibernation
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217 session.hibernating = hibernate_time;
478
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218 local resumption_token = session.resumption_token;
257
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219 timer.add_task(resume_timeout, function ()
586
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220 session.log("debug", "mod_smacks hibernation timeout reached...");
478
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221 -- We need to check the current resumption token for this resource
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222 -- matches the smacks session this timer is for in case it changed
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223 -- (for example, the client may have bound a new resource and
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224 -- started a new smacks session, or not be using smacks)
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225 local curr_session = hosts[session.host].sessions[session.username].sessions[session.resource];
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226 if curr_session.resumption_token == resumption_token
345
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227 -- Check the hibernate time still matches what we think it is,
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228 -- otherwise the session resumed and re-hibernated.
478
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229 and session.hibernating == hibernate_time then
586
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230 session.log("debug", "Destroying session for hibernating too long");
345
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231 session_registry[session.resumption_token] = nil;
257
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232 session.resumption_token = nil;
345
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233 sessionmanager.destroy_session(session);
586
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234 else
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235 session.log("debug", "Session resumed before hibernation timeout, all is well")
257
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236 end
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237 end);
622
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238 return true; -- Postpone destruction for now
160
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parents:
diff changeset
239 end
258
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diff changeset
240
160
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parents:
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241 end
622
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242 end);
345
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243
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244 module:hook_stanza(xmlns_sm, "resume", function (session, stanza)
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245 local id = stanza.attr.previd;
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246 local original_session = session_registry[id];
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247 if not original_session then
588
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diff changeset
248 session.log("debug", "Tried to resume non-existent session with id %s", id);
345
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249 session.send(st.stanza("failed", sm_attr)
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250 :tag("item-not-found", { xmlns = xmlns_errors })
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251 );
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252 elseif session.username == original_session.username
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253 and session.host == original_session.host then
587
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254 session.log("debug", "mod_smacks resuming existing session...");
345
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255 -- TODO: All this should move to sessionmanager (e.g. session:replace(new_session))
623
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256 if original_session.conn then
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257 session.log("debug", "mod_smacks closing an old connection for this session");
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258 local conn = original_session.conn;
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259 c2s_sessions[conn] = nil;
623
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260 conn:close();
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261 end
345
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262 original_session.ip = session.ip;
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263 original_session.conn = session.conn;
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diff changeset
264 original_session.send = session.send;
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265 original_session.stream = session.stream;
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266 original_session.secure = session.secure;
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267 original_session.hibernating = nil;
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268 local filter = original_session.filter;
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269 local stream = session.stream;
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270 local log = session.log;
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diff changeset
271 function original_session.data(data)
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272 data = filter("bytes/in", data);
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diff changeset
273 if data then
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diff changeset
274 local ok, err = stream:feed(data);
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275 if ok then return; end
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diff changeset
276 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
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diff changeset
277 original_session:close("xml-not-well-formed");
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diff changeset
278 end
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diff changeset
279 end
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diff changeset
280 wrap_session(original_session, true);
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281 -- Inform xmppstream of the new session (passed to its callbacks)
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diff changeset
282 stream:set_session(original_session);
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diff changeset
283 -- Similar for connlisteners
640
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diff changeset
284 c2s_sessions[session.conn] = original_session;
345
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parents: 263
diff changeset
285
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diff changeset
286 session.send(st.stanza("resumed", { xmlns = xmlns_sm,
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diff changeset
287 h = original_session.handled_stanza_count, previd = id }));
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diff changeset
288
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diff changeset
289 -- Fake an <a> with the h of the <resume/> from the client
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diff changeset
290 original_session:dispatch_stanza(st.stanza("a", { xmlns = xmlns_sm,
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diff changeset
291 h = stanza.attr.h }));
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diff changeset
292
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diff changeset
293 -- Ok, we need to re-send any stanzas that the client didn't see
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diff changeset
294 -- ...they are what is now left in the outgoing stanza queue
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diff changeset
295 local queue = original_session.outgoing_stanza_queue;
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diff changeset
296 for i=1,#queue do
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diff changeset
297 session.send(queue[i]);
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diff changeset
298 end
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diff changeset
299 else
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diff changeset
300 log("warn", "Client %s@%s[%s] tried to resume stream for %s@%s[%s]",
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diff changeset
301 session.username or "?", session.host or "?", session.type,
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diff changeset
302 original_session.username or "?", original_session.host or "?", original_session.type);
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diff changeset
303 session.send(st.stanza("failed", sm_attr)
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diff changeset
304 :tag("not-authorized", { xmlns = xmlns_errors }));
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diff changeset
305 end
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diff changeset
306 return true;
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diff changeset
307 end);