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1 /*
2  * InspIRCd -- Internet Relay Chat Daemon
3  *
4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
5  *   Copyright (C) 2008-2009 Robin Burchell <robin+git@viroteck.net>
6  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
7  *   Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
8  *
9  * This file is part of InspIRCd.  InspIRCd is free software: you can
10  * redistribute it and/or modify it under the terms of the GNU General Public
11  * License as published by the Free Software Foundation, version 2.
12  *
13  * This program is distributed in the hope that it will be useful, but WITHOUT
14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
16  * details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22
23 #include "inspircd.h"
24
25 /* $ModDesc: Implementation of callerid, usermode +g, /accept */
26
27 class callerid_data
28 {
29  public:
30         time_t lastnotify;
31
32         /** Users I accept messages from
33          */
34         std::set<User*> accepting;
35
36         /** Users who list me as accepted
37          */
38         std::list<callerid_data *> wholistsme;
39
40         callerid_data() : lastnotify(0) { }
41
42         std::string ToString(SerializeFormat format) const
43         {
44                 std::ostringstream oss;
45                 oss << lastnotify;
46                 for (std::set<User*>::const_iterator i = accepting.begin(); i != accepting.end(); ++i)
47                 {
48                         User* u = *i;
49                         // Encode UIDs.
50                         oss << "," << (format == FORMAT_USER ? u->nick : u->uuid);
51                 }
52                 return oss.str();
53         }
54 };
55
56 struct CallerIDExtInfo : public ExtensionItem
57 {
58         CallerIDExtInfo(Module* parent)
59                 : ExtensionItem("callerid_data", parent)
60         {
61         }
62
63         std::string serialize(SerializeFormat format, const Extensible* container, void* item) const
64         {
65                 callerid_data* dat = static_cast<callerid_data*>(item);
66                 return dat->ToString(format);
67         }
68
69         void unserialize(SerializeFormat format, Extensible* container, const std::string& value)
70         {
71                 callerid_data* dat = new callerid_data;
72                 irc::commasepstream s(value);
73                 std::string tok;
74                 if (s.GetToken(tok))
75                         dat->lastnotify = ConvToInt(tok);
76
77                 while (s.GetToken(tok))
78                 {
79                         if (tok.empty())
80                                 continue;
81
82                         User *u = ServerInstance->FindNick(tok);
83                         if ((u) && (u->registered == REG_ALL) && (!u->quitting) && (!IS_SERVER(u)))
84                         {
85                                 if (dat->accepting.insert(u).second)
86                                 {
87                                         callerid_data* other = this->get(u, true);
88                                         other->wholistsme.push_back(dat);
89                                 }
90                         }
91                 }
92
93                 void* old = set_raw(container, dat);
94                 if (old)
95                         this->free(old);
96         }
97
98         callerid_data* get(User* user, bool create)
99         {
100                 callerid_data* dat = static_cast<callerid_data*>(get_raw(user));
101                 if (create && !dat)
102                 {
103                         dat = new callerid_data;
104                         set_raw(user, dat);
105                 }
106                 return dat;
107         }
108
109         void free(void* item)
110         {
111                 callerid_data* dat = static_cast<callerid_data*>(item);
112
113                 // We need to walk the list of users on our accept list, and remove ourselves from their wholistsme.
114                 for (std::set<User *>::iterator it = dat->accepting.begin(); it != dat->accepting.end(); it++)
115                 {
116                         callerid_data *targ = this->get(*it, false);
117
118                         if (!targ)
119                         {
120                                 ServerInstance->Logs->Log("m_callerid", DEFAULT, "ERROR: Inconsistency detected in callerid state, please report (1)");
121                                 continue; // shouldn't happen, but oh well.
122                         }
123
124                         std::list<callerid_data*>::iterator it2 = std::find(targ->wholistsme.begin(), targ->wholistsme.end(), dat);
125                         if (it2 != targ->wholistsme.end())
126                                 targ->wholistsme.erase(it2);
127                         else
128                                 ServerInstance->Logs->Log("m_callerid", DEFAULT, "ERROR: Inconsistency detected in callerid state, please report (2)");
129                 }
130                 delete dat;
131         }
132 };
133
134 class User_g : public SimpleUserModeHandler
135 {
136 public:
137         User_g(Module* Creator) : SimpleUserModeHandler(Creator, "callerid", 'g') { }
138 };
139
140 class CommandAccept : public Command
141 {
142 public:
143         CallerIDExtInfo extInfo;
144         unsigned int maxaccepts;
145         CommandAccept(Module* Creator) : Command(Creator, "ACCEPT", 1),
146                 extInfo(Creator)
147         {
148                 allow_empty_last_param = false;
149                 syntax = "{[+|-]<nicks>}|*}";
150                 TRANSLATE2(TR_CUSTOM, TR_END);
151         }
152
153         virtual void EncodeParameter(std::string& parameter, int index)
154         {
155                 if (index != 0)
156                         return;
157                 std::string out;
158                 irc::commasepstream nicks(parameter);
159                 std::string tok;
160                 while (nicks.GetToken(tok))
161                 {
162                         if (tok == "*")
163                         {
164                                 continue; // Drop list requests, since remote servers ignore them anyway.
165                         }
166                         if (!out.empty())
167                                 out.append(",");
168                         bool dash = false;
169                         if (tok[0] == '-')
170                         {
171                                 dash = true;
172                                 tok.erase(0, 1); // Remove the dash.
173                         }
174                         else if (tok[0] == '+')
175                                 tok.erase(0, 1);
176
177                         User* u = ServerInstance->FindNick(tok);
178                         if ((!u) || (u->registered != REG_ALL) || (u->quitting) || (IS_SERVER(u)))
179                                 continue;
180
181                         if (dash)
182                                 out.append("-");
183                         out.append(u->uuid);
184                 }
185                 parameter = out;
186         }
187
188         /** Will take any number of nicks (up to MaxTargets), which can be seperated by commas.
189          * - in front of any nick removes, and an * lists. This effectively means you can do:
190          * /accept nick1,nick2,nick3,*
191          * to add 3 nicks and then show your list
192          */
193         CmdResult Handle(const std::vector<std::string> &parameters, User* user)
194         {
195                 if (ServerInstance->Parser->LoopCall(user, this, parameters, 0))
196                         return CMD_SUCCESS;
197                 /* Even if callerid mode is not set, we let them manage their ACCEPT list so that if they go +g they can
198                  * have a list already setup. */
199
200                 std::string tok = parameters[0];
201
202                 if (tok == "*")
203                 {
204                         if (IS_LOCAL(user))
205                                 ListAccept(user);
206                         return CMD_SUCCESS;
207                 }
208                 else if (tok[0] == '-')
209                 {
210                         User* whotoremove = ServerInstance->FindNick(tok.substr(1));
211                         if (whotoremove)
212                                 return (RemoveAccept(user, whotoremove) ? CMD_SUCCESS : CMD_FAILURE);
213                         else
214                                 return CMD_FAILURE;
215                 }
216                 else
217                 {
218                         User* whotoadd = ServerInstance->FindNick(tok[0] == '+' ? tok.substr(1) : tok);
219                         if ((whotoadd) && (whotoadd->registered == REG_ALL) && (!whotoadd->quitting) && (!IS_SERVER(whotoadd)))
220                                 return (AddAccept(user, whotoadd) ? CMD_SUCCESS : CMD_FAILURE);
221                         else
222                         {
223                                 user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick.c_str(), tok.c_str());
224                                 return CMD_FAILURE;
225                         }
226                 }
227         }
228
229         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
230         {
231                 return ROUTE_BROADCAST;
232         }
233
234         void ListAccept(User* user)
235         {
236                 callerid_data* dat = extInfo.get(user, false);
237                 if (dat)
238                 {
239                         for (std::set<User*>::iterator i = dat->accepting.begin(); i != dat->accepting.end(); ++i)
240                                 user->WriteNumeric(281, "%s %s", user->nick.c_str(), (*i)->nick.c_str());
241                 }
242                 user->WriteNumeric(282, "%s :End of ACCEPT list", user->nick.c_str());
243         }
244
245         bool AddAccept(User* user, User* whotoadd)
246         {
247                 // Add this user to my accept list first, so look me up..
248                 callerid_data* dat = extInfo.get(user, true);
249                 if (dat->accepting.size() >= maxaccepts)
250                 {
251                         user->WriteNumeric(456, "%s :Accept list is full (limit is %d)", user->nick.c_str(), maxaccepts);
252                         return false;
253                 }
254                 if (!dat->accepting.insert(whotoadd).second)
255                 {
256                         user->WriteNumeric(457, "%s %s :is already on your accept list", user->nick.c_str(), whotoadd->nick.c_str());
257                         return false;
258                 }
259
260                 // Now, look them up, and add me to their list
261                 callerid_data *targ = extInfo.get(whotoadd, true);
262                 targ->wholistsme.push_back(dat);
263
264                 user->WriteServ("NOTICE %s :%s is now on your accept list", user->nick.c_str(), whotoadd->nick.c_str());
265                 return true;
266         }
267
268         bool RemoveAccept(User* user, User* whotoremove)
269         {
270                 // Remove them from my list, so look up my list..
271                 callerid_data* dat = extInfo.get(user, false);
272                 if (!dat)
273                 {
274                         user->WriteNumeric(458, "%s %s :is not on your accept list", user->nick.c_str(), whotoremove->nick.c_str());
275                         return false;
276                 }
277                 std::set<User*>::iterator i = dat->accepting.find(whotoremove);
278                 if (i == dat->accepting.end())
279                 {
280                         user->WriteNumeric(458, "%s %s :is not on your accept list", user->nick.c_str(), whotoremove->nick.c_str());
281                         return false;
282                 }
283
284                 dat->accepting.erase(i);
285
286                 // Look up their list to remove me.
287                 callerid_data *dat2 = extInfo.get(whotoremove, false);
288                 if (!dat2)
289                 {
290                         // How the fuck is this possible.
291                         ServerInstance->Logs->Log("m_callerid", DEFAULT, "ERROR: Inconsistency detected in callerid state, please report (3)");
292                         return false;
293                 }
294
295                 std::list<callerid_data*>::iterator it = std::find(dat2->wholistsme.begin(), dat2->wholistsme.end(), dat);
296                 if (it != dat2->wholistsme.end())
297                         // Found me!
298                         dat2->wholistsme.erase(it);
299                 else
300                         ServerInstance->Logs->Log("m_callerid", DEFAULT, "ERROR: Inconsistency detected in callerid state, please report (4)");
301
302
303                 user->WriteServ("NOTICE %s :%s is no longer on your accept list", user->nick.c_str(), whotoremove->nick.c_str());
304                 return true;
305         }
306 };
307
308 class ModuleCallerID : public Module
309 {
310 private:
311         CommandAccept cmd;
312         User_g myumode;
313
314         // Configuration variables:
315         bool operoverride; // Operators can override callerid.
316         bool tracknick; // Allow ACCEPT entries to update with nick changes.
317         unsigned int notify_cooldown; // Seconds between notifications.
318
319         /** Removes a user from all accept lists
320          * @param who The user to remove from accepts
321          */
322         void RemoveFromAllAccepts(User* who)
323         {
324                 // First, find the list of people who have me on accept
325                 callerid_data *userdata = cmd.extInfo.get(who, false);
326                 if (!userdata)
327                         return;
328
329                 // Iterate over the list of people who accept me, and remove all entries
330                 for (std::list<callerid_data *>::iterator it = userdata->wholistsme.begin(); it != userdata->wholistsme.end(); it++)
331                 {
332                         callerid_data *dat = *(it);
333
334                         // Find me on their callerid list
335                         std::set<User *>::iterator it2 = dat->accepting.find(who);
336
337                         if (it2 != dat->accepting.end())
338                                 dat->accepting.erase(it2);
339                         else
340                                 ServerInstance->Logs->Log("m_callerid", DEFAULT, "ERROR: Inconsistency detected in callerid state, please report (5)");
341                 }
342
343                 userdata->wholistsme.clear();
344         }
345
346 public:
347         ModuleCallerID() : cmd(this), myumode(this)
348         {
349         }
350
351         void init()
352         {
353                 OnRehash(NULL);
354
355                 ServerInstance->Modules->AddService(myumode);
356                 ServerInstance->Modules->AddService(cmd);
357                 ServerInstance->Modules->AddService(cmd.extInfo);
358
359                 Implementation eventlist[] = { I_OnRehash, I_OnUserPostNick, I_OnUserQuit, I_On005Numeric, I_OnUserPreNotice, I_OnUserPreMessage };
360                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
361         }
362
363         virtual ~ModuleCallerID()
364         {
365         }
366
367         virtual Version GetVersion()
368         {
369                 return Version("Implementation of callerid, usermode +g, /accept", VF_COMMON | VF_VENDOR);
370         }
371
372         virtual void On005Numeric(std::string& output)
373         {
374                 output += " CALLERID=g";
375         }
376
377         ModResult PreText(User* user, User* dest, std::string& text)
378         {
379                 if (!dest->IsModeSet('g') || (user == dest))
380                         return MOD_RES_PASSTHRU;
381
382                 if (operoverride && IS_OPER(user))
383                         return MOD_RES_PASSTHRU;
384
385                 callerid_data* dat = cmd.extInfo.get(dest, true);
386                 std::set<User*>::iterator i = dat->accepting.find(user);
387
388                 if (i == dat->accepting.end())
389                 {
390                         time_t now = ServerInstance->Time();
391                         /* +g and *not* accepted */
392                         user->WriteNumeric(716, "%s %s :is in +g mode (server-side ignore).", user->nick.c_str(), dest->nick.c_str());
393                         if (now > (dat->lastnotify + (time_t)notify_cooldown))
394                         {
395                                 user->WriteNumeric(717, "%s %s :has been informed that you messaged them.", user->nick.c_str(), dest->nick.c_str());
396                                 dest->SendText(":%s 718 %s %s %s@%s :is messaging you, and you have umode +g. Use /ACCEPT +%s to allow.",
397                                         ServerInstance->Config->ServerName.c_str(), dest->nick.c_str(), user->nick.c_str(), user->ident.c_str(), user->dhost.c_str(), user->nick.c_str());
398                                 dat->lastnotify = now;
399                         }
400                         return MOD_RES_DENY;
401                 }
402                 return MOD_RES_PASSTHRU;
403         }
404
405         virtual ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string& text, char status, CUList &exempt_list)
406         {
407                 if (IS_LOCAL(user) && target_type == TYPE_USER)
408                         return PreText(user, (User*)dest, text);
409
410                 return MOD_RES_PASSTHRU;
411         }
412
413         virtual ModResult OnUserPreNotice(User* user, void* dest, int target_type, std::string& text, char status, CUList &exempt_list)
414         {
415                 if (IS_LOCAL(user) && target_type == TYPE_USER)
416                         return PreText(user, (User*)dest, text);
417
418                 return MOD_RES_PASSTHRU;
419         }
420
421         void OnUserPostNick(User* user, const std::string& oldnick)
422         {
423                 if (!tracknick)
424                         RemoveFromAllAccepts(user);
425         }
426
427         void OnUserQuit(User* user, const std::string& message, const std::string& oper_message)
428         {
429                 RemoveFromAllAccepts(user);
430         }
431
432         virtual void OnRehash(User* user)
433         {
434                 ConfigTag* tag = ServerInstance->Config->ConfValue("callerid");
435                 cmd.maxaccepts = tag->getInt("maxaccepts", 16);
436                 operoverride = tag->getBool("operoverride");
437                 tracknick = tag->getBool("tracknick");
438                 notify_cooldown = tag->getInt("cooldown", 60);
439         }
440 };
441
442 MODULE_INIT(ModuleCallerID)
443
444