src/modules/m_permchannels.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/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) : ModeHandler(Instance, '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 (adding)
  29                 {
  30                         if (!channel->IsModeSet('P'))
  31                         {
  32                                 channel->SetMode('P',true);
  33                                 return MODEACTION_ALLOW;
  34                         }
  35                 }
  36                 else
  37                 {
  38                         if (channel->IsModeSet('P'))
  39                         {
  40                                 if (channel->GetUserCounter() == 0 && !sm)
  41                                 {
  42                                         /*
  43                                          * ugh, ugh, UGH!
  44                                          *
  45                                          * We can't delete this channel the way things work at the moment,
  46                                          * because of the following scenario:
  47                                          * s1:#c <-> s2:#c
  48                                          *
  49                                          * s1 has a user in #c, s2 does not. s2 has +P set. s2 has a losing TS.
  50                                          *
  51                                          * On netmerge, s2 loses, so s2 removes all modes (including +P) which
  52                                          * would subsequently delete the channel here causing big fucking problems.
  53                                          *
  54                                          * I don't think there's really a way around this, so just deny -P on a 0 user chan.
  55                                          * -- w00t
  56                                          *
  57                                          * delete channel;
  58                                          */
  59                                         return MODEACTION_DENY;
  60                                 }
  61
  62                                 /* for servers, remove +P (to avoid desyncs) but don't bother trying to delete. */
  63                                 channel->SetMode('P',false);
  64                                 return MODEACTION_ALLOW;
  65                         }
  66                 }
  67
  68                 return MODEACTION_DENY;
  69         }
  70 };
  71
  72 class ModulePermanentChannels : public Module
  73 {
  74         PermChannel *p;
  75 public:
  76
  77         ModulePermanentChannels(InspIRCd* Me) : Module(Me)
  78         {
  79                 p = new PermChannel(ServerInstance);
  80                 if (!ServerInstance->Modes->AddMode(p))
  81                 {
  82                         delete p;
  83                         throw ModuleException("Could not add new modes!");
  84                 }
  85                 Implementation eventlist[] = { I_OnChannelPreDelete };
  86                 ServerInstance->Modules->Attach(eventlist, this, 1);
  87
  88                 OnRehash(NULL, "");
  89         }
  90
  91         virtual ~ModulePermanentChannels()
  92         {
  93                 ServerInstance->Modes->DelMode(p);
  94                 delete p;
  95         }
  96
  97         virtual void OnRehash(User *user, const std::string &parameter)
  98         {
  99                 /*
 100                  * Process config-defined list of permanent channels.
 101                  * -- w00t
 102                  */
 103                 ConfigReader MyConf(ServerInstance);
 104                 for (int i = 0; i < MyConf.Enumerate("permchannels"); i++)
 105                 {
 106                         std::string channel = MyConf.ReadValue("permchannels", "channel", i);
 107                         std::string topic = MyConf.ReadValue("permchannels", "topic", i);
 108                         std::string modes = MyConf.ReadValue("permchannels", "modes", i);
 109
 110                         if (channel.empty())
 111                         {
 112                                 ServerInstance->Logs->Log("blah", DEBUG, "Malformed permchannels tag with empty channel name.");
 113                                 continue;
 114                         }
 115
 116                         Channel *c = ServerInstance->FindChan(channel);
 117
 118                         if (!c)
 119                         {
 120                                 c = new Channel(ServerInstance, channel, ServerInstance->Time());
 121                                 if (!topic.empty())
 122                                         c->SetTopic(NULL, topic, true);
 123                                 ServerInstance->Logs->Log("blah", DEBUG, "Added %s with topic %s", channel.c_str(), topic.c_str());
 124
 125                                 if (modes.empty())
 126                                         continue;
 127
 128                                 irc::spacesepstream list(modes);
 129                                 std::string modeseq;
 130                                 std::string par;
 131
 132                                 list.GetToken(modeseq);
 133
 134                                 // XXX bleh, should we pass this to the mode parser instead? ugly. --w00t
 135                                 for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 136                                 {
 137                                         ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 138                                         if (mode)
 139                                         {
 140                                                 if (mode->GetNumParams(true))
 141                                                         list.GetToken(par);
 142                                                 else
 143                                                         par.clear();
 144
 145                                                 mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, c, par, true);
 146                                         }
 147                                 }
 148                         }
 149                 }
 150         }
 151
 152         virtual Version GetVersion()
 153         {
 154                 return Version("$Id$",VF_COMMON|VF_VENDOR,API_VERSION);
 155         }
 156
 157         virtual int OnChannelPreDelete(Channel *c)
 158         {
 159                 if (c->IsModeSet('P'))
 160                         return 1;
 161
 162                 return 0;
 163         }
 164 };
 165
 166 MODULE_INIT(ModulePermanentChannels)