src/modules/m_redirect.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 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 "users.h"
  15 #include "channels.h"
  16 #include "modules.h"
  17 #include "inspircd.h"
  18
  19 /* $ModDesc: Provides channel mode +L (limit redirection) */
  20
  21 /** Handle channel mode +L
  22  */
  23 class Redirect : public ModeHandler
  24 {
  25  public:
  26         Redirect(InspIRCd* Instance) : ModeHandler(Instance, 'L', 1, 0, false, MODETYPE_CHANNEL, false) { }
  27
  28         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  29         {
  30                 if (channel->IsModeSet('L'))
  31                         return std::make_pair(true, channel->GetModeParameter('L'));
  32                 else
  33                         return std::make_pair(false, parameter);
  34         }
  35
  36         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
  37         {
  38                 /* When TS is equal, the alphabetically later one wins */
  39                 return (their_param < our_param);
  40         }
  41
  42         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
  43         {
  44                 if (adding)
  45                 {
  46                         chanrec* c = NULL;
  47
  48                         if (!ServerInstance->IsChannel(parameter.c_str()))
  49                         {
  50                                 source->WriteServ("403 %s %s :Invalid channel name",source->nick, parameter.c_str());
  51                                 parameter = "";
  52                                 return MODEACTION_DENY;
  53                         }
  54
  55                         c = ServerInstance->FindChan(parameter);
  56                         if (c)
  57                         {
  58                                 /* Fix by brain: Dont let a channel be linked to *itself* either */
  59                                 if (IS_LOCAL(source))
  60                                 {
  61                                         if ((c == channel) || (c->IsModeSet('L')))
  62                                         {
  63                                                 source->WriteServ("690 %s :Circular or chained +L to %s not allowed (Channel already has +L). Pack of wild dogs has been unleashed.",source->nick,parameter.c_str());
  64                                                 parameter = "";
  65                                                 return MODEACTION_DENY;
  66                                         }
  67                                         else
  68                                         {
  69                                                 for (chan_hash::const_iterator i = ServerInstance->chanlist->begin(); i != ServerInstance->chanlist->end(); i++)
  70                                                 {
  71                                                         if ((i->second != channel) && (i->second->IsModeSet('L')) && (irc::string(i->second->GetModeParameter('L').c_str()) == irc::string(channel->name)))
  72                                                         {
  73                                                                 source->WriteServ("690 %s :Circular or chained +L to %s not allowed (Already forwarded here from %s). Angry monkeys dispatched.",source->nick,parameter.c_str(),i->second->name);
  74                                                                 return MODEACTION_DENY;
  75                                                         }
  76                                                 }
  77                                         }
  78                                 }
  79                         }
  80
  81                         channel->SetMode('L', true);
  82                         channel->SetModeParam('L', parameter.c_str(), true);
  83                         return MODEACTION_ALLOW;
  84                 }
  85                 else
  86                 {
  87                         if (channel->IsModeSet('L'))
  88                         {
  89                                 channel->SetMode('L', false);
  90                                 return MODEACTION_ALLOW;
  91                         }
  92                 }
  93
  94                 return MODEACTION_DENY;
  95
  96         }
  97 };
  98
  99 class ModuleRedirect : public Module
 100 {
 101
 102         Redirect* re;
 103
 104  public:
 105
 106         ModuleRedirect(InspIRCd* Me)
 107                 : Module::Module(Me)
 108         {
 109
 110                 re = new Redirect(ServerInstance);
 111                 if (!ServerInstance->AddMode(re, 'L'))
 112                         throw ModuleException("Could not add new modes!");
 113         }
 114
 115         void Implements(char* List)
 116         {
 117                 List[I_OnUserPreJoin] = 1;
 118         }
 119
 120         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname, std::string &privs)
 121         {
 122                 if (chan)
 123                 {
 124                         if (chan->IsModeSet('L') && chan->limit)
 125                         {
 126                                 if (chan->GetUserCounter() >= chan->limit)
 127                                 {
 128                                         std::string channel = chan->GetModeParameter('L');
 129
 130                                         /* sometimes broken ulines can make circular or chained +L, avoid this */
 131                                         chanrec* destchan = NULL;
 132                                         destchan = ServerInstance->FindChan(channel);
 133                                         if (destchan && destchan->IsModeSet('L'))
 134                                         {
 135                                                 user->WriteServ("470 %s :%s is full, but has a circular redirect (+L), not following redirection to %s", user->nick, cname, channel.c_str());
 136                                                 return 1;
 137                                         }
 138
 139                                         user->WriteServ("470 %s :%s has become full, so you are automatically being transferred to the linked channel %s", user->nick, cname, channel.c_str());
 140                                         chanrec::JoinUser(ServerInstance, user, channel.c_str(), false, "", ServerInstance->Time(true));
 141                                         return 1;
 142                                 }
 143                         }
 144                 }
 145                 return 0;
 146         }
 147
 148         virtual ~ModuleRedirect()
 149         {
 150                 ServerInstance->Modes->DelMode(re);
 151                 DELETE(re);
 152         }
 153
 154         virtual Version GetVersion()
 155         {
 156                 return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 157         }
 158 };
 159
 160
 161 class ModuleRedirectFactory : public ModuleFactory
 162 {
 163  public:
 164         ModuleRedirectFactory()
 165         {
 166         }
 167
 168         ~ModuleRedirectFactory()
 169         {
 170         }
 171
 172         virtual Module * CreateModule(InspIRCd* Me)
 173         {
 174                 return new ModuleRedirect(Me);
 175         }
 176
 177 };
 178
 179
 180 extern "C" void * init_module( void )
 181 {
 182         return new ModuleRedirectFactory;
 183 }
 184