src/modules/m_redirect.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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(Module* Creator) : ModeHandler(Creator, 'L', PARAM_SETONLY, MODETYPE_CHANNEL) { }
  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         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
  34         {
  35                 if (adding)
  36                 {
  37                         if (IS_LOCAL(source))
  38                         {
  39                                 if (!ServerInstance->IsChannel(parameter.c_str(), ServerInstance->Config->Limits.ChanMax))
  40                                 {
  41                                         source->WriteNumeric(403, "%s %s :Invalid channel name", source->nick.c_str(), parameter.c_str());
  42                                         parameter.clear();
  43                                         return MODEACTION_DENY;
  44                                 }
  45                         }
  46
  47                         if (IS_LOCAL(source) && !IS_OPER(source))
  48                         {
  49                                 Channel* c = ServerInstance->FindChan(parameter);
  50                                 if (!c)
  51                                 {
  52                                         source->WriteNumeric(690, "%s :Target channel %s must exist to be set as a redirect.",source->nick.c_str(),parameter.c_str());
  53                                         parameter.clear();
  54                                         return MODEACTION_DENY;
  55                                 }
  56                                 else if (c->GetPrefixValue(source) < OP_VALUE)
  57                                 {
  58                                         source->WriteNumeric(690, "%s :You must be opped on %s to set it as a redirect.",source->nick.c_str(),parameter.c_str());
  59                                         parameter.clear();
  60                                         return MODEACTION_DENY;
  61                                 }
  62                         }
  63
  64                         /*
  65                          * We used to do some checking for circular +L here, but there is no real need for this any more especially as we
  66                          * now catch +L looping in PreJoin. Remove it, since O(n) logic makes me sad, and we catch it anyway. :) -- w00t
  67                          */
  68                         channel->SetModeParam('L', parameter);
  69                         return MODEACTION_ALLOW;
  70                 }
  71                 else
  72                 {
  73                         if (channel->IsModeSet('L'))
  74                         {
  75                                 channel->SetModeParam('L', "");
  76                                 return MODEACTION_ALLOW;
  77                         }
  78                 }
  79
  80                 return MODEACTION_DENY;
  81
  82         }
  83 };
  84
  85 class ModuleRedirect : public Module
  86 {
  87
  88         Redirect re;
  89
  90  public:
  91
  92         ModuleRedirect()
  93                 : re(this)
  94         {
  95
  96                 if (!ServerInstance->Modes->AddMode(&re))
  97                         throw ModuleException("Could not add new modes!");
  98                 Implementation eventlist[] = { I_OnUserPreJoin };
  99                 ServerInstance->Modules->Attach(eventlist, this, 1);
 100         }
 101
 102
 103         virtual ModResult OnUserPreJoin(User* user, Channel* chan, const char* cname, std::string &privs, const std::string &keygiven)
 104         {
 105                 if (chan)
 106                 {
 107                         if (chan->IsModeSet('L') && chan->modes[CM_LIMIT])
 108                         {
 109                                 if (chan->GetUserCounter() >= atoi(chan->GetModeParameter('l').c_str()))
 110                                 {
 111                                         std::string channel = chan->GetModeParameter('L');
 112
 113                                         /* sometimes broken ulines can make circular or chained +L, avoid this */
 114                                         Channel* destchan = NULL;
 115                                         destchan = ServerInstance->FindChan(channel);
 116                                         if (destchan && destchan->IsModeSet('L'))
 117                                         {
 118                                                 user->WriteNumeric(470, "%s %s * :You may not join this channel. A redirect is set, but you may not be redirected as it is a circular loop.", user->nick.c_str(), cname);
 119                                                 return MOD_RES_DENY;
 120                                         }
 121
 122                                         user->WriteNumeric(470, "%s %s %s :You may not join this channel, so you are automatically being transferred to the redirect channel.", user->nick.c_str(), cname, channel.c_str());
 123                                         Channel::JoinUser(user, channel.c_str(), false, "", false, ServerInstance->Time());
 124                                         return MOD_RES_DENY;
 125                                 }
 126                         }
 127                 }
 128                 return MOD_RES_PASSTHRU;
 129         }
 130
 131         virtual ~ModuleRedirect()
 132         {
 133                 ServerInstance->Modes->DelMode(&re);
 134         }
 135
 136         virtual Version GetVersion()
 137         {
 138                 return Version("Provides channel mode +L (limit redirection)", VF_COMMON | VF_VENDOR, API_VERSION);
 139         }
 140 };
 141
 142 MODULE_INIT(ModuleRedirect)