summaryrefslogtreecommitdiff
path: root/src/xmpp/biboumi_component.cpp
blob: 49964387a054a58ca38b409a0e75b05cbfaa45cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
#include <xmpp/biboumi_component.hpp>

#include <utils/timed_events.hpp>
#include <utils/scopeguard.hpp>
#include <utils/tolower.hpp>
#include <logger/logger.hpp>
#include <xmpp/adhoc_command.hpp>
#include <xmpp/biboumi_adhoc_commands.hpp>
#include <bridge/list_element.hpp>
#include <config/config.hpp>
#include <xmpp/jid.hpp>
#include <utils/sha1.hpp>

#include <stdexcept>
#include <iostream>

#include <stdio.h>

#include <louloulibs.h>

#include <uuid.h>

#ifdef SYSTEMD_FOUND
# include <systemd/sd-daemon.h>
#endif

using namespace std::string_literals;

static std::set<std::string> kickable_errors{
    "gone",
    "internal-server-error",
    "item-not-found",
    "jid-malformed",
    "recipient-unavailable",
    "redirect",
    "remote-server-not-found",
    "remote-server-timeout",
    "service-unavailable",
    "malformed-error"
    };


BiboumiComponent::BiboumiComponent(std::shared_ptr<Poller> poller, const std::string& hostname, const std::string& secret):
  XmppComponent(poller, hostname, secret)
{
  this->stanza_handlers.emplace("presence",
                                std::bind(&BiboumiComponent::handle_presence, this,std::placeholders::_1));
  this->stanza_handlers.emplace("message",
                                std::bind(&BiboumiComponent::handle_message, this,std::placeholders::_1));
  this->stanza_handlers.emplace("iq",
                                std::bind(&BiboumiComponent::handle_iq, this,std::placeholders::_1));

  this->adhoc_commands_handler.get_commands()= {
    {"ping", AdhocCommand({&PingStep1}, "Do a ping", false)},
    {"hello", AdhocCommand({&HelloStep1, &HelloStep2}, "Receive a custom greeting", false)},
    {"disconnect-user", AdhocCommand({&DisconnectUserStep1, &DisconnectUserStep2}, "Disconnect a user from the gateway", true)},
    {"reload", AdhocCommand({&Reload}, "Reload biboumi’s configuration", true)}
  };
}

void BiboumiComponent::shutdown()
{
  for (auto it = this->bridges.begin(); it != this->bridges.end(); ++it)
  {
    it->second->shutdown("Gateway shutdown");
  }
}

void BiboumiComponent::clean()
{
  auto it = this->bridges.begin();
  while (it != this->bridges.end())
  {
    it->second->clean();
    if (it->second->active_clients() == 0)
      it = this->bridges.erase(it);
    else
      ++it;
  }
}

void BiboumiComponent::handle_presence(const Stanza& stanza)
{
  std::string from = stanza.get_tag("from");
  std::string id = stanza.get_tag("id");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  // Check for mandatory tags
  if (from.empty())
    {
      log_warning("Received an invalid presence stanza: tag 'from' is missing.");
      return;
    }
  if (to_str.empty())
    {
      this->send_stanza_error("presence", from, this->served_hostname, id,
                              "modify", "bad-request", "Missing 'to' tag");
      return;
    }

  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);
  Iid iid(to.local);

  // An error stanza is sent whenever we exit this function without
  // disabling this scopeguard.  If error_type and error_name are not
  // changed, the error signaled is internal-server-error. Change their
  // value to signal an other kind of error. For example
  // feature-not-implemented, etc.  Any non-error process should reach the
  // stanza_error.disable() call at the end of the function.
  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("presence", from, to_str, id,
                              error_type, error_name, "");
        });

  if (iid.is_channel && !iid.get_server().empty())
    { // presence toward a MUC that corresponds to an irc channel, or a
      // dummy channel if iid.chan is empty
      if (type.empty())
        {
          const std::string own_nick = bridge->get_own_nick(iid);
          if (!own_nick.empty() && own_nick != to.resource)
            bridge->send_irc_nick_change(iid, to.resource);
          XmlNode* x = stanza.get_child("x", MUC_NS);
          XmlNode* password = x ? x->get_child("password", MUC_NS): nullptr;
          bridge->join_irc_channel(iid, to.resource,
                                   password ? password->get_inner() : "");
        }
      else if (type == "unavailable")
        {
          XmlNode* status = stanza.get_child("status", COMPONENT_NS);
          bridge->leave_irc_channel(std::move(iid), status ? std::move(status->get_inner()) : "");
        }
    }
  else
    {
      // An user wants to join an invalid IRC channel, return a presence error to him
      if (type.empty())
        this->send_invalid_room_error(to.local, to.resource, from);
    }
  stanza_error.disable();
}

void BiboumiComponent::handle_message(const Stanza& stanza)
{
  std::string from = stanza.get_tag("from");
  std::string id = stanza.get_tag("id");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  if (from.empty())
    return;
  if (type.empty())
    type = "normal";
  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);
  Iid iid(to.local);

  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("message", from, to_str, id,
                              error_type, error_name, "");
    });
  XmlNode* body = stanza.get_child("body", COMPONENT_NS);

  try {                         // catch IRCNotConnected exceptions
  if (type == "groupchat" && iid.is_channel)
    {
      if (body && !body->get_inner().empty())
        {
          bridge->send_channel_message(iid, body->get_inner());
        }
      XmlNode* subject = stanza.get_child("subject", COMPONENT_NS);
      if (subject)
        bridge->set_channel_topic(iid, subject->get_inner());
    }
  else if (type == "error")
    {
      const XmlNode* error = stanza.get_child("error", COMPONENT_NS);
      // Only a set of errors are considered “fatal”. If we encounter one of
      // them, we purge (we disconnect the user from all the IRC servers).
      // We consider this to be true, unless the error condition is
      // specified and is not in the kickable_errors set
      bool kickable_error = true;
      if (error && error->has_children())
        {
          const XmlNode* condition = error->get_last_child();
          if (kickable_errors.find(condition->get_name()) == kickable_errors.end())
            kickable_error = false;
        }
      if (kickable_error)
        bridge->shutdown("Error from remote client");
    }
  else if (type == "chat")
    {
      if (body && !body->get_inner().empty())
        {
          // a message for nick!server
          if (iid.is_user && !iid.get_local().empty())
            {
              bridge->send_private_message(iid, body->get_inner());
              bridge->remove_preferred_from_jid(iid.get_local());
            }
          else if (!iid.is_user && !to.resource.empty())
            { // a message for chan%server@biboumi/Nick or
              // server@biboumi/Nick
              // Convert that into a message to nick!server
              Iid user_iid(utils::tolower(to.resource) + "!" + iid.get_server());
              bridge->send_private_message(user_iid, body->get_inner());
              bridge->set_preferred_from_jid(user_iid.get_local(), to_str);
            }
          else if (!iid.is_user && !iid.is_channel)
            { // Message sent to the server JID
              // Convert the message body into a raw IRC message
              bridge->send_raw_message(iid.get_server(), body->get_inner());
            }
        }
    }
  else if (iid.is_user)
    this->send_invalid_user_error(to.local, from);
  } catch (const IRCNotConnected& ex)
    {
      this->send_stanza_error("message", from, to_str, id,
                              "cancel", "remote-server-not-found",
                              "Not connected to IRC server "s + ex.hostname,
                              true);
    }
  stanza_error.disable();
}

// We MUST return an iq, whatever happens, except if the type is
// "result".
// To do this, we use a scopeguard. If an exception is raised somewhere, an
// iq of type error "internal-server-error" is sent. If we handle the
// request properly (by calling a function that registers an iq to be sent
// later, or that directly sends an iq), we disable the ScopeGuard. If we
// reach the end of the function without having disabled the scopeguard, we
// send a "feature-not-implemented" iq as a result.  If an other kind of
// error is found (for example the feature is implemented in biboumi, but
// the request is missing some attribute) we can just change the values of
// error_type and error_name and return from the function (without disabling
// the scopeguard); an iq error will be sent
void BiboumiComponent::handle_iq(const Stanza& stanza)
{
  std::string id = stanza.get_tag("id");
  std::string from = stanza.get_tag("from");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  if (from.empty())
    return;
  if (id.empty() || to_str.empty() || type.empty())
    {
      this->send_stanza_error("iq", from, this->served_hostname, id,
                              "modify", "bad-request", "");
      return;
    }

  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);

  // These two values will be used in the error iq sent if we don't disable
  // the scopeguard.
  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("iq", from, to_str, id,
                              error_type, error_name, "");
    });
  try {
  if (type == "set")
    {
      XmlNode* query;
      if ((query = stanza.get_child("query", MUC_ADMIN_NS)))
        {
          const XmlNode* child = query->get_child("item", MUC_ADMIN_NS);
          if (child)
            {
              std::string nick = child->get_tag("nick");
              std::string role = child->get_tag("role");
              std::string affiliation = child->get_tag("affiliation");
              if (!nick.empty())
                {
                  Iid iid(to.local);
                  if (role == "none")
                    {               // This is a kick
                      std::string reason;
                      XmlNode* reason_el = child->get_child("reason", MUC_ADMIN_NS);
                      if (reason_el)
                        reason = reason_el->get_inner();
                      bridge->send_irc_kick(iid, nick, reason, id, from);
                    }
                  else
                    bridge->forward_affiliation_role_change(iid, nick, affiliation, role);
                  stanza_error.disable();
                }
            }
        }
      else if ((query = stanza.get_child("command", ADHOC_NS)))
        {
          Stanza response("iq");
          response["to"] = from;
          response["from"] = this->served_hostname;
          response["id"] = id;
          XmlNode inner_node = this->adhoc_commands_handler.handle_request(from, *query);
          if (inner_node.get_child("error", ADHOC_NS))
            response["type"] = "error";
          else
            response["type"] = "result";
          response.add_child(std::move(inner_node));
          response.close();
          this->send_stanza(response);
          stanza_error.disable();
        }
    }
  else if (type == "get")
    {
      XmlNode* query;
      if ((query = stanza.get_child("query", DISCO_INFO_NS)))
        { // Disco info
          if (to_str == this->served_hostname)
            {
              const std::string node = query->get_tag("node");
              if (node.empty())
                {
                  // On the gateway itself
                  this->send_self_disco_info(id, from);
                  stanza_error.disable();
                }
            }
        }
      else if ((query = stanza.get_child("query", VERSION_NS)))
        {
          Iid iid(to.local);
          if (iid.is_user ||
              (iid.is_channel && !to.resource.empty()))
            {
              // Get the IRC user version
              std::string target;
              if (iid.is_user)
                target = iid.get_local();
              else
                target = to.resource;
              bridge->send_irc_version_request(iid.get_server(), target, id,
                                               from, to_str);
            }
          else
            {
              // On the gateway itself or on a channel
              this->send_version(id, from, to_str);
            }
          stanza_error.disable();
        }
      else if ((query = stanza.get_child("query", DISCO_ITEMS_NS)))
        {
          Iid iid(to.local);
          const std::string node = query->get_tag("node");
          if (node == ADHOC_NS)
            {
              this->send_adhoc_commands_list(id, from);
              stanza_error.disable();
            }
          else if (node.empty() && !iid.is_user && !iid.is_channel)
            { // Disco on an IRC server: get the list of channels
              bridge->send_irc_channel_list_request(iid, id, from);
              stanza_error.disable();
            }
        }
      else if ((query = stanza.get_child("ping", PING_NS)))
        {
          Iid iid(to.local);
          if (iid.is_user)
            { // Ping any user (no check on the nick done ourself)
              bridge->send_irc_user_ping_request(iid.get_server(),
                                                 iid.get_local(), id, from, to_str);
            }
          else if (iid.is_channel && !to.resource.empty())
            { // Ping a room participant (we check if the nick is in the room)
              bridge->send_irc_participant_ping_request(iid,
                                                        to.resource, id, from, to_str);
            }
          else
            { // Ping a channel, a server or the gateway itself
              bridge->on_gateway_ping(iid.get_server(),
                                     id, from, to_str);
            }
          stanza_error.disable();
        }
    }
  else if (type == "result")
    {
      stanza_error.disable();
      XmlNode* query;
      if ((query = stanza.get_child("query", VERSION_NS)))
        {
          XmlNode* name_node = query->get_child("name", VERSION_NS);
          XmlNode* version_node = query->get_child("version", VERSION_NS);
          XmlNode* os_node = query->get_child("os", VERSION_NS);
          std::string name;
          std::string version;
          std::string os;
          if (name_node)
            name = name_node->get_inner() + " (through the biboumi gateway)";
          if (version_node)
            version = version_node->get_inner();
          if (os_node)
            os = os_node->get_inner();
          const Iid iid(to.local);
          bridge->send_xmpp_version_to_irc(iid, name, version, os);
        }
      else
        {
          const auto it = this->waiting_iq.find(id);
          if (it != this->waiting_iq.end())
            {
              it->second(bridge, stanza);
              this->waiting_iq.erase(it);
            }
        }
    }
  }
  catch (const IRCNotConnected& ex)
    {
      this->send_stanza_error("iq", from, to_str, id,
                              "cancel", "remote-server-not-found",
                              "Not connected to IRC server "s + ex.hostname,
                              true);
      stanza_error.disable();
      return;
    }
  error_type = "cancel";
  error_name = "feature-not-implemented";
}

Bridge* BiboumiComponent::get_user_bridge(const std::string& user_jid)
{
  try
    {
      return this->bridges.at(user_jid).get();
    }
  catch (const std::out_of_range& exception)
    {
      this->bridges.emplace(user_jid, std::make_unique<Bridge>(user_jid, this, this->poller));
      return this->bridges.at(user_jid).get();
    }
}

Bridge* BiboumiComponent::find_user_bridge(const std::string& user_jid)
{
  try
    {
      return this->bridges.at(user_jid).get();
    }
  catch (const std::out_of_range& exception)
    {
      return nullptr;
    }
}

std::list<Bridge*> BiboumiComponent::get_bridges() const
{
  std::list<Bridge*> res;
  for (auto it = this->bridges.begin(); it != this->bridges.end(); ++it)
    res.push_back(it->second.get());
  return res;
}

void BiboumiComponent::send_self_disco_info(const std::string& id, const std::string& jid_to)
{
  Stanza iq("iq");
  iq["type"] = "result";
  iq["id"] = id;
  iq["to"] = jid_to;
  iq["from"] = this->served_hostname;
  XmlNode query("query");
  query["xmlns"] = DISCO_INFO_NS;
  XmlNode identity("identity");
  identity["category"] = "conference";
  identity["type"] = "irc";
  identity["name"] = "Biboumi XMPP-IRC gateway";
  identity.close();
  query.add_child(std::move(identity));
  for (const std::string& ns: {DISCO_INFO_NS, MUC_NS, ADHOC_NS})
    {
      XmlNode feature("feature");
      feature["var"] = ns;
      feature.close();
      query.add_child(std::move(feature));
    }
  query.close();
  iq.add_child(std::move(query));
  iq.close();
  this->send_stanza(iq);
}

void BiboumiComponent::send_adhoc_commands_list(const std::string& id, const std::string& requester_jid)
{
  Stanza iq("iq");
  iq["type"] = "result";
  iq["id"] = id;
  iq["to"] = requester_jid;
  iq["from"] = this->served_hostname;
  XmlNode query("query");
  query["xmlns"] = DISCO_ITEMS_NS;
  query["node"] = ADHOC_NS;
  for (const auto& kv: this->adhoc_commands_handler.get_commands())
    {
      XmlNode item("item");
      item["jid"] = this->served_hostname;
      item["node"] = kv.first;
      item["name"] = kv.second.name;
      item.close();
      query.add_child(std::move(item));
    }
  query.close();
  iq.add_child(std::move(query));
  iq.close();
  this->send_stanza(iq);
}

void BiboumiComponent::send_iq_version_request(const std::string& from,
                                            const std::string& jid_to)
{
  Stanza iq("iq");
  iq["type"] = "get";
  iq["id"] = "version_"s + this->next_id();
  iq["from"] = from + "@" + this->served_hostname;
  iq["to"] = jid_to;
  XmlNode query("query");
  query["xmlns"] = VERSION_NS;
  query.close();
  iq.add_child(std::move(query));
  iq.close();
  this->send_stanza(iq);
}

void BiboumiComponent::send_ping_request(const std::string& from,
                                      const std::string& jid_to,
                                      const std::string& id)
{
  Stanza iq("iq");
  iq["type"] = "get";
  iq["id"] = id;
  iq["from"] = from + "@" + this->served_hostname;
  iq["to"] = jid_to;
  XmlNode ping("ping");
  ping["xmlns"] = PING_NS;
  ping.close();
  iq.add_child(std::move(ping));
  iq.close();
  this->send_stanza(iq);

  auto result_cb = [from, id](Bridge* bridge, const Stanza& stanza)
    {
      Jid to(stanza.get_tag("to"));
      if (to.local != from)
        {
          log_error("Received a corresponding ping result, but the 'to' from "
                    "the response mismatches the 'from' of the request");
        }
      else
        bridge->send_irc_ping_result(from, id);
    };
  this->waiting_iq[id] = result_cb;
}

void BiboumiComponent::send_iq_room_list_result(const std::string& id,
                                             const std::string to_jid,
                                             const std::string& from,
                                             const std::vector<ListElement>& rooms_list)
{
  Stanza iq("iq");
  iq["from"] = from + "@" + this->served_hostname;
  iq["to"] = to_jid;
  iq["id"] = id;
  iq["type"] = "result";
  XmlNode query("query");
  query["xmlns"] = DISCO_ITEMS_NS;
  for (const auto& room: rooms_list)
    {
      XmlNode item("item");
      item["jid"] = room.channel + "%" + from + "@" + this->served_hostname;
      item.close();
      query.add_child(std::move(item));
    }
  query.close();
  iq.add_child(std::move(query));
  iq.close();
  this->send_stanza(iq);
}