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 (!source->HasPrivPermission("channels/set-permanent"))
  29                         return MODEACTION_DENY;
  30
  31                 if (adding)
  32                 {
  33                         if (!channel->IsModeSet('P'))
  34                         {
  35                                 channel->SetMode('P',true);
  36                                 return MODEACTION_ALLOW;
  37                         }
  38                 }
  39                 else
  40                 {
  41                         if (channel->IsModeSet('P'))
  42                         {
  43                                 if (channel->GetUserCounter() == 0 && !sm)
  44                                 {
  45                                         /*
  46                                          * ugh, ugh, UGH!
  47                                          *
  48                                          * We can't delete this channel the way things work at the moment,
  49                                          * because of the following scenario:
  50                                          * s1:#c <-> s2:#c
  51                                          *
  52                                          * s1 has a user in #c, s2 does not. s2 has +P set. s2 has a losing TS.
  53                                          *
  54                                          * On netmerge, s2 loses, so s2 removes all modes (including +P) which
  55                                          * would subsequently delete the channel here causing big fucking problems.
  56                                          *
  57                                          * I don't think there's really a way around this, so just deny -P on a 0 user chan.
  58                                          * -- w00t
  59                                          *
  60                                          * delete channel;
  61                                          */
  62                                         return MODEACTION_DENY;
  63                                 }
  64
  65                                 /* for servers, remove +P (to avoid desyncs) but don't bother trying to delete. */
  66                                 channel->SetMode('P',false);
  67                                 return MODEACTION_ALLOW;
  68                         }
  69                 }
  70
  71                 return MODEACTION_DENY;
  72         }
  73 };
  74
  75 class ModulePermanentChannels : public Module
  76 {
  77         PermChannel *p;
  78 public:
  79
  80         ModulePermanentChannels(InspIRCd* Me) : Module(Me)
  81         {
  82                 p = new PermChannel(ServerInstance);
  83                 if (!ServerInstance->Modes->AddMode(p))
  84                 {
  85                         delete p;
  86                         throw ModuleException("Could not add new modes!");
  87                 }
  88                 Implementation eventlist[] = { I_OnChannelPreDelete };
  89                 ServerInstance->Modules->Attach(eventlist, this, 1);
  90
  91                 OnRehash(NULL, "");
  92         }
  93
  94         virtual ~ModulePermanentChannels()
  95         {
  96                 ServerInstance->Modes->DelMode(p);
  97                 delete p;
  98         }
  99
 100         virtual void OnRehash(User *user, const std::string &parameter)
 101         {
 102                 /*
 103                  * Process config-defined list of permanent channels.
 104                  * -- w00t
 105                  */
 106                 ConfigReader MyConf(ServerInstance);
 107                 for (int i = 0; i < MyConf.Enumerate("permchannels"); i++)
 108                 {
 109                         std::string channel = MyConf.ReadValue("permchannels", "channel", i);
 110                         std::string topic = MyConf.ReadValue("permchannels", "topic", i);
 111                         std::string modes = MyConf.ReadValue("permchannels", "modes", i);
 112
 113                         if (channel.empty())
 114                         {
 115                                 ServerInstance->Logs->Log("blah", DEBUG, "Malformed permchannels tag with empty channel name.");
 116                                 continue;
 117                         }
 118
 119                         Channel *c = ServerInstance->FindChan(channel);
 120
 121                         if (!c)
 122                         {
 123                                 c = new Channel(ServerInstance, channel, ServerInstance->Time());
 124                                 if (!topic.empty())
 125                                         c->SetTopic(NULL, topic, true);
 126                                 ServerInstance->Logs->Log("blah", DEBUG, "Added %s with topic %s", channel.c_str(), topic.c_str());
 127
 128                                 if (modes.empty())
 129                                         continue;
 130
 131                                 irc::spacesepstream list(modes);
 132                                 std::string modeseq;
 133                                 std::string par;
 134
 135                                 list.GetToken(modeseq);
 136
 137                                 // XXX bleh, should we pass this to the mode parser instead? ugly. --w00t
 138                                 for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 139                                 {
 140                                         ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 141                                         if (mode)
 142                                         {
 143                                                 if (mode->GetNumParams(true))
 144                                                         list.GetToken(par);
 145                                                 else
 146                                                         par.clear();
 147
 148                                                 mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, c, par, true);
 149                                         }
 150                                 }
 151                         }
 152                 }
 153         }
 154
 155         virtual Version GetVersion()
 156         {
 157                 return Version("$Id$",VF_COMMON|VF_VENDOR,API_VERSION);
 158         }
 159
 160         virtual int OnChannelPreDelete(Channel *c)
 161         {
 162                 if (c->IsModeSet('P'))
 163                         return 1;
 164
 165                 return 0;
 166         }
 167 };
 168
 169 MODULE_INIT(ModulePermanentChannels)