src/modules/m_permchannels.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 /* $ModDesc: Provides support for channel mode +P to provide permanent channels */
  17
  18
  19 /** Handles the +P channel mode
  20  */
  21 class PermChannel : public ModeHandler
  22 {
  23  public:
  24         PermChannel(InspIRCd* Instance, Module* Creator) : ModeHandler(Instance, Creator, 'P', 0, 0, false, MODETYPE_CHANNEL, false) { }
  25
  26         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding, bool sm)
  27         {
  28                 if (!source->HasPrivPermission("channels/set-permanent"))
  29                 {
  30                         source->WriteNumeric(ERR_NOPRIVILEGES, "%s :Permission Denied - You do not have the required operator privileges", source->nick.c_str());
  31                         return MODEACTION_DENY;
  32                 }
  33
  34                 if (adding)
  35                 {
  36                         if (!channel->IsModeSet('P'))
  37                         {
  38                                 channel->SetMode('P',true);
  39                                 return MODEACTION_ALLOW;
  40                         }
  41                 }
  42                 else
  43                 {
  44                         if (channel->IsModeSet('P'))
  45                         {
  46                                 if (channel->GetUserCounter() == 0 && !sm)
  47                                 {
  48                                         /*
  49                                          * ugh, ugh, UGH!
  50                                          *
  51                                          * We can't delete this channel the way things work at the moment,
  52                                          * because of the following scenario:
  53                                          * s1:#c <-> s2:#c
  54                                          *
  55                                          * s1 has a user in #c, s2 does not. s2 has +P set. s2 has a losing TS.
  56                                          *
  57                                          * On netmerge, s2 loses, so s2 removes all modes (including +P) which
  58                                          * would subsequently delete the channel here causing big fucking problems.
  59                                          *
  60                                          * I don't think there's really a way around this, so just deny -P on a 0 user chan.
  61                                          * -- w00t
  62                                          *
  63                                          * delete channel;
  64                                          */
  65                                         return MODEACTION_DENY;
  66                                 }
  67
  68                                 /* for servers, remove +P (to avoid desyncs) but don't bother trying to delete. */
  69                                 channel->SetMode('P',false);
  70                                 return MODEACTION_ALLOW;
  71                         }
  72                 }
  73
  74                 return MODEACTION_DENY;
  75         }
  76 };
  77
  78 class ModulePermanentChannels : public Module
  79 {
  80         PermChannel p;
  81 public:
  82
  83         ModulePermanentChannels(InspIRCd* Me) : Module(Me), p(Me, this)
  84         {
  85                 if (!ServerInstance->Modes->AddMode(&p))
  86                         throw ModuleException("Could not add new modes!");
  87                 Implementation eventlist[] = { I_OnChannelPreDelete };
  88                 ServerInstance->Modules->Attach(eventlist, this, 1);
  89
  90                 OnRehash(NULL);
  91         }
  92
  93         virtual ~ModulePermanentChannels()
  94         {
  95                 ServerInstance->Modes->DelMode(&p);
  96                 /*
  97                  * DelMode can't remove the +P mode on empty channels, or it will break
  98                  * merging modes with remote servers. Remove the empty channels now as
  99                  * we know this is not the case.
 100                  */
 101                 chan_hash::iterator iter = ServerInstance->chanlist->begin();
 102                 while (iter != ServerInstance->chanlist->end())
 103                 {
 104                         Channel* c = iter->second;
 105                         if (c->GetUserCounter() == 0)
 106                         {
 107                                 chan_hash::iterator at = iter;
 108                                 iter++;
 109                                 ServerInstance->chanlist->erase(at);
 110                                 delete c;
 111                         }
 112                         else
 113                                 iter++;
 114                 }
 115         }
 116
 117         virtual void OnRehash(User *user)
 118         {
 119                 /*
 120                  * Process config-defined list of permanent channels.
 121                  * -- w00t
 122                  */
 123                 ConfigReader MyConf(ServerInstance);
 124                 for (int i = 0; i < MyConf.Enumerate("permchannels"); i++)
 125                 {
 126                         std::string channel = MyConf.ReadValue("permchannels", "channel", i);
 127                         std::string topic = MyConf.ReadValue("permchannels", "topic", i);
 128                         std::string modes = MyConf.ReadValue("permchannels", "modes", i);
 129
 130                         if (channel.empty())
 131                         {
 132                                 ServerInstance->Logs->Log("blah", DEBUG, "Malformed permchannels tag with empty channel name.");
 133                                 continue;
 134                         }
 135
 136                         Channel *c = ServerInstance->FindChan(channel);
 137
 138                         if (!c)
 139                         {
 140                                 c = new Channel(ServerInstance, channel, ServerInstance->Time());
 141                                 if (!topic.empty())
 142                                 {
 143                                         c->SetTopic(NULL, topic, true);
 144
 145                                         /*
 146                                          * Due to the way protocol works in 1.2, we need to hack the topic TS in such a way that this
 147                                          * topic will always win over others.
 148                                          *
 149                                          * This is scheduled for (proper) fixing in a later release, and can be removed at a later date.
 150                                          */
 151                                         c->topicset = 42;
 152                                 }
 153                                 ServerInstance->Logs->Log("blah", DEBUG, "Added %s with topic %s", channel.c_str(), topic.c_str());
 154
 155                                 if (modes.empty())
 156                                         continue;
 157
 158                                 irc::spacesepstream list(modes);
 159                                 std::string modeseq;
 160                                 std::string par;
 161
 162                                 list.GetToken(modeseq);
 163
 164                                 // XXX bleh, should we pass this to the mode parser instead? ugly. --w00t
 165                                 for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 166                                 {
 167                                         ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 168                                         if (mode)
 169                                         {
 170                                                 if (mode->GetNumParams(true))
 171                                                         list.GetToken(par);
 172                                                 else
 173                                                         par.clear();
 174
 175                                                 mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, c, par, true);
 176                                         }
 177                                 }
 178                         }
 179                 }
 180         }
 181
 182         virtual Version GetVersion()
 183         {
 184                 return Version("$Id$",VF_COMMON|VF_VENDOR,API_VERSION);
 185         }
 186
 187         virtual int OnChannelPreDelete(Channel *c)
 188         {
 189                 if (c->IsModeSet('P'))
 190                         return 1;
 191
 192                 return 0;
 193         }
 194 };
 195
 196 MODULE_INIT(ModulePermanentChannels)