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1 /*
2  * InspIRCd -- Internet Relay Chat Daemon
3  *
4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
5  *
6  * This file is part of InspIRCd.  InspIRCd is free software: you can
7  * redistribute it and/or modify it under the terms of the GNU General Public
8  * License as published by the Free Software Foundation, version 2.
9  *
10  * This program is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
13  * details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17  */
18
19 #include "inspircd.h"
20 #include "listmode.h"
21
22 ListModeBase::ListModeBase(Module* Creator, const std::string& Name, char modechar, const std::string &eolstr, unsigned int lnum, unsigned int eolnum, bool autotidy, const std::string &ctag)
23         : ModeHandler(Creator, Name, modechar, PARAM_ALWAYS, MODETYPE_CHANNEL),
24         listnumeric(lnum), endoflistnumeric(eolnum), endofliststring(eolstr), tidy(autotidy),
25         configtag(ctag), extItem("listbase_mode_" + name + "_list", Creator)
26 {
27         list = true;
28 }
29
30 void ListModeBase::DisplayList(User* user, Channel* channel)
31 {
32         ModeList* el = extItem.get(channel);
33         if (el)
34         {
35                 for (ModeList::reverse_iterator it = el->rbegin(); it != el->rend(); ++it)
36                 {
37                         user->WriteNumeric(listnumeric, "%s %s %s %s %lu", user->nick.c_str(), channel->name.c_str(), it->mask.c_str(), (!it->setter.empty() ? it->setter.c_str() : ServerInstance->Config->ServerName.c_str()), (unsigned long) it->time);
38                 }
39         }
40         user->WriteNumeric(endoflistnumeric, "%s %s :%s", user->nick.c_str(), channel->name.c_str(), endofliststring.c_str());
41 }
42
43 void ListModeBase::DisplayEmptyList(User* user, Channel* channel)
44 {
45         user->WriteNumeric(endoflistnumeric, "%s %s :%s", user->nick.c_str(), channel->name.c_str(), endofliststring.c_str());
46 }
47
48 void ListModeBase::RemoveMode(Channel* channel, irc::modestacker* stack)
49 {
50         ModeList* el = extItem.get(channel);
51         if (el)
52         {
53                 irc::modestacker modestack(false);
54
55                 for (ModeList::iterator it = el->begin(); it != el->end(); it++)
56                 {
57                         if (stack)
58                                 stack->Push(this->GetModeChar(), it->mask);
59                         else
60                                 modestack.Push(this->GetModeChar(), it->mask);
61                 }
62
63                 if (stack)
64                         return;
65
66                 std::vector<std::string> stackresult;
67                 stackresult.push_back(channel->name);
68                 while (modestack.GetStackedLine(stackresult))
69                 {
70                         ServerInstance->SendMode(stackresult, ServerInstance->FakeClient);
71                         stackresult.clear();
72                         stackresult.push_back(channel->name);
73                 }
74         }
75 }
76
77 void ListModeBase::RemoveMode(User*, irc::modestacker* stack)
78 {
79         /* Listmodes dont get set on users */
80 }
81
82 void ListModeBase::DoRehash()
83 {
84         ConfigTagList tags = ServerInstance->Config->ConfTags(configtag);
85
86         chanlimits.clear();
87
88         for (ConfigIter i = tags.first; i != tags.second; i++)
89         {
90                 // For each <banlist> tag
91                 ConfigTag* c = i->second;
92                 ListLimit limit(c->getString("chan"), c->getInt("limit"));
93
94                 if (limit.mask.size() && limit.limit > 0)
95                         chanlimits.push_back(limit);
96         }
97
98         if (chanlimits.empty())
99                 chanlimits.push_back(ListLimit("*", 64));
100 }
101
102 void ListModeBase::DoImplements(Module* m)
103 {
104         ServerInstance->Modules->AddService(extItem);
105         this->DoRehash();
106         Implementation eventlist[] = { I_OnSyncChannel, I_OnRehash };
107         ServerInstance->Modules->Attach(eventlist, m, sizeof(eventlist)/sizeof(Implementation));
108 }
109
110 unsigned int ListModeBase::GetLimit(Channel* channel)
111 {
112         for (limitlist::iterator it = chanlimits.begin(); it != chanlimits.end(); ++it)
113         {
114                 if (InspIRCd::Match(channel->name, it->mask))
115                 {
116                         // We have a pattern matching the channel
117                         return it->limit;
118                 }
119         }
120         return 64;
121 }
122
123 ModeAction ListModeBase::OnModeChange(User* source, User*, Channel* channel, std::string &parameter, bool adding)
124 {
125         // Try and grab the list
126         ModeList* el = extItem.get(channel);
127
128         if (adding)
129         {
130                 if (tidy)
131                         ModeParser::CleanMask(parameter);
132
133                 if (parameter.length() > 250)
134                         return MODEACTION_DENY;
135
136                 // If there was no list
137                 if (!el)
138                 {
139                         // Make one
140                         el = new ModeList;
141                         extItem.set(channel, el);
142                 }
143
144                 // Check if the item already exists in the list
145                 for (ModeList::iterator it = el->begin(); it != el->end(); it++)
146                 {
147                         if (parameter == it->mask)
148                         {
149                                 /* Give a subclass a chance to error about this */
150                                 TellAlreadyOnList(source, channel, parameter);
151
152                                 // it does, deny the change
153                                 return MODEACTION_DENY;
154                         }
155                 }
156
157                 if ((IS_LOCAL(source)) && (el->size() >= GetLimit(channel)))
158                 {
159                         /* List is full, give subclass a chance to send a custom message */
160                         TellListTooLong(source, channel, parameter);
161                         parameter.clear();
162                         return MODEACTION_DENY;
163                 }
164
165                 /* Ok, it *could* be allowed, now give someone subclassing us
166                  * a chance to validate the parameter.
167                  * The param is passed by reference, so they can both modify it
168                  * and tell us if we allow it or not.
169                  *
170                  * eg, the subclass could:
171                  * 1) allow
172                  * 2) 'fix' parameter and then allow
173                  * 3) deny
174                  */
175                 if (ValidateParam(source, channel, parameter))
176                 {
177                         // And now add the mask onto the list...
178                         el->push_back(ListItem(parameter, source->nick, ServerInstance->Time()));
179                         return MODEACTION_ALLOW;
180                 }
181                 else
182                 {
183                         /* If they deny it they have the job of giving an error message */
184                         return MODEACTION_DENY;
185                 }
186         }
187         else
188         {
189                 // We're taking the mode off
190                 if (el)
191                 {
192                         for (ModeList::iterator it = el->begin(); it != el->end(); it++)
193                         {
194                                 if (parameter == it->mask)
195                                 {
196                                         el->erase(it);
197                                         return MODEACTION_ALLOW;
198                                 }
199                         }
200                 }
201
202                 /* Tried to remove something that wasn't set */
203                 TellNotSet(source, channel, parameter);
204                 parameter.clear();
205                 return MODEACTION_DENY;
206         }
207 }
208
209 void ListModeBase::DoSyncChannel(Channel* chan, Module* proto, void* opaque)
210 {
211         ModeList* mlist = extItem.get(chan);
212         if (!mlist)
213                 return;
214
215         irc::modestacker modestack(true);
216         std::vector<std::string> stackresult;
217         std::vector<TranslateType> types;
218         types.push_back(TR_TEXT);
219
220         for (ModeList::iterator it = mlist->begin(); it != mlist->end(); it++)
221                 modestack.Push(mode, it->mask);
222
223         while (modestack.GetStackedLine(stackresult))
224         {
225                 types.assign(stackresult.size(), this->GetTranslateType());
226                 proto->ProtoSendMode(opaque, TYPE_CHANNEL, chan, stackresult, types);
227                 stackresult.clear();
228         }
229 }
230
231 bool ListModeBase::ValidateParam(User*, Channel*, std::string&)
232 {
233         return true;
234 }
235
236 void ListModeBase::TellListTooLong(User* source, Channel* channel, std::string& parameter)
237 {
238         source->WriteNumeric(478, "%s %s %s :Channel ban list is full", source->nick.c_str(), channel->name.c_str(), parameter.c_str());
239 }
240
241 void ListModeBase::TellAlreadyOnList(User*, Channel*, std::string&)
242 {
243 }
244
245 void ListModeBase::TellNotSet(User*, Channel*, std::string&)
246 {
247 }