src/modules/m_redirect.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 channel mode +L (limit redirection) */
  17
  18 /** Handle channel mode +L
  19  */
  20 class Redirect : public ModeHandler
  21 {
  22  public:
  23         Redirect(InspIRCd* Instance) : ModeHandler(Instance, 'L', 1, 0, false, MODETYPE_CHANNEL, false) { }
  24
  25         ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string &parameter)
  26         {
  27                 if (channel->IsModeSet('L'))
  28                         return std::make_pair(true, channel->GetModeParameter('L'));
  29                 else
  30                         return std::make_pair(false, parameter);
  31         }
  32
  33         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, Channel* channel)
  34         {
  35                 /* When TS is equal, the alphabetically later one wins */
  36                 return (their_param < our_param);
  37         }
  38
  39         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
  40         {
  41                 if (adding)
  42                 {
  43                         Channel* c = NULL;
  44
  45                         if (!ServerInstance->IsChannel(parameter.c_str()))
  46                         {
  47                                 source->WriteServ("403 %s %s :Invalid channel name",source->nick, parameter.c_str());
  48                                 parameter.clear();
  49                                 return MODEACTION_DENY;
  50                         }
  51
  52                         c = ServerInstance->FindChan(parameter);
  53                         if (c)
  54                         {
  55                                 /* Fix by brain: Dont let a channel be linked to *itself* either */
  56                                 if (IS_LOCAL(source))
  57                                 {
  58                                         if ((c == channel) || (c->IsModeSet('L')))
  59                                         {
  60                                                 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());
  61                                                 parameter.clear();
  62                                                 return MODEACTION_DENY;
  63                                         }
  64                                         else
  65                                         {
  66                                                 for (chan_hash::const_iterator i = ServerInstance->chanlist->begin(); i != ServerInstance->chanlist->end(); i++)
  67                                                 {
  68                                                         if ((i->second != channel) && (i->second->IsModeSet('L')) && (irc::string(i->second->GetModeParameter('L').c_str()) == irc::string(channel->name)))
  69                                                         {
  70                                                                 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);
  71                                                                 return MODEACTION_DENY;
  72                                                         }
  73                                                 }
  74                                         }
  75                                 }
  76                         }
  77
  78                         channel->SetMode('L', true);
  79                         channel->SetModeParam('L', parameter.c_str(), true);
  80                         return MODEACTION_ALLOW;
  81                 }
  82                 else
  83                 {
  84                         if (channel->IsModeSet('L'))
  85                         {
  86                                 channel->SetMode('L', false);
  87                                 return MODEACTION_ALLOW;
  88                         }
  89                 }
  90
  91                 return MODEACTION_DENY;
  92
  93         }
  94 };
  95
  96 class ModuleRedirect : public Module
  97 {
  98
  99         Redirect* re;
 100
 101  public:
 102
 103         ModuleRedirect(InspIRCd* Me)
 104                 : Module(Me)
 105         {
 106
 107                 re = new Redirect(ServerInstance);
 108                 if (!ServerInstance->AddMode(re))
 109                         throw ModuleException("Could not add new modes!");
 110                 Implementation eventlist[] = { I_OnUserPreJoin };
 111                 ServerInstance->Modules->Attach(eventlist, this, 1);
 112         }
 113
 114
 115         virtual int OnUserPreJoin(User* user, Channel* chan, const char* cname, std::string &privs)
 116         {
 117                 if (chan)
 118                 {
 119                         if (chan->IsModeSet('L') && chan->limit)
 120                         {
 121                                 if (chan->GetUserCounter() >= chan->limit)
 122                                 {
 123                                         std::string channel = chan->GetModeParameter('L');
 124
 125                                         /* sometimes broken ulines can make circular or chained +L, avoid this */
 126                                         Channel* destchan = NULL;
 127                                         destchan = ServerInstance->FindChan(channel);
 128                                         if (destchan && destchan->IsModeSet('L'))
 129                                         {
 130                                                 user->WriteServ("470 %s :%s is full, but has a circular redirect (+L), not following redirection to %s", user->nick, cname, channel.c_str());
 131                                                 return 1;
 132                                         }
 133
 134                                         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());
 135                                         Channel::JoinUser(ServerInstance, user, channel.c_str(), false, "", false, ServerInstance->Time(true));
 136                                         return 1;
 137                                 }
 138                         }
 139                 }
 140                 return 0;
 141         }
 142
 143         virtual ~ModuleRedirect()
 144         {
 145                 ServerInstance->Modes->DelMode(re);
 146                 delete re;
 147         }
 148
 149         virtual Version GetVersion()
 150         {
 151                 return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 152         }
 153 };
 154
 155 MODULE_INIT(ModuleRedirect)