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                 {
  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)
  84         {
  85                 p = new PermChannel(ServerInstance);
  86                 if (!ServerInstance->Modes->AddMode(p))
  87                 {
  88                         delete p;
  89                         throw ModuleException("Could not add new modes!");
  90                 }
  91                 Implementation eventlist[] = { I_OnChannelPreDelete };
  92                 ServerInstance->Modules->Attach(eventlist, this, 1);
  93
  94                 OnRehash(NULL, "");
  95         }
  96
  97         virtual ~ModulePermanentChannels()
  98         {
  99                 ServerInstance->Modes->DelMode(p);
 100                 delete p;
 101         }
 102
 103         virtual void OnRehash(User *user, const std::string &parameter)
 104         {
 105                 /*
 106                  * Process config-defined list of permanent channels.
 107                  * -- w00t
 108                  */
 109                 ConfigReader MyConf(ServerInstance);
 110                 for (int i = 0; i < MyConf.Enumerate("permchannels"); i++)
 111                 {
 112                         std::string channel = MyConf.ReadValue("permchannels", "channel", i);
 113                         std::string topic = MyConf.ReadValue("permchannels", "topic", i);
 114                         std::string modes = MyConf.ReadValue("permchannels", "modes", i);
 115
 116                         if (channel.empty())
 117                         {
 118                                 ServerInstance->Logs->Log("blah", DEBUG, "Malformed permchannels tag with empty channel name.");
 119                                 continue;
 120                         }
 121
 122                         Channel *c = ServerInstance->FindChan(channel);
 123
 124                         if (!c)
 125                         {
 126                                 c = new Channel(ServerInstance, channel, ServerInstance->Time());
 127                                 if (!topic.empty())
 128                                         c->SetTopic(NULL, topic, true);
 129                                 ServerInstance->Logs->Log("blah", DEBUG, "Added %s with topic %s", channel.c_str(), topic.c_str());
 130
 131                                 if (modes.empty())
 132                                         continue;
 133
 134                                 irc::spacesepstream list(modes);
 135                                 std::string modeseq;
 136                                 std::string par;
 137
 138                                 list.GetToken(modeseq);
 139
 140                                 // XXX bleh, should we pass this to the mode parser instead? ugly. --w00t
 141                                 for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 142                                 {
 143                                         ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 144                                         if (mode)
 145                                         {
 146                                                 if (mode->GetNumParams(true))
 147                                                         list.GetToken(par);
 148                                                 else
 149                                                         par.clear();
 150
 151                                                 mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, c, par, true);
 152                                         }
 153                                 }
 154                         }
 155                 }
 156         }
 157
 158         virtual Version GetVersion()
 159         {
 160                 return Version("$Id$",VF_COMMON|VF_VENDOR,API_VERSION);
 161         }
 162
 163         virtual int OnChannelPreDelete(Channel *c)
 164         {
 165                 if (c->IsModeSet('P'))
 166                         return 1;
 167
 168                 return 0;
 169         }
 170 };
 171
 172 MODULE_INIT(ModulePermanentChannels)