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home » brain » inspircd-cvs » 1_1_stable » src » modules

m_redirect.cpp

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/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
 * See: http://www.inspircd.org/wiki/index.php/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"
#include "users.h"
#include "channels.h"
#include "modules.h"

/* $ModDesc: Provides channel mode +L (limit redirection) */

class Redirect : public ModeHandler
{
 public:
        Redirect(InspIRCd* Instance) : ModeHandler(Instance, 'L', 1, 0, false, MODETYPE_CHANNEL, false) { }

        ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
        {
                if (channel->IsModeSet('L'))
                        return std::make_pair(true, channel->GetModeParameter('L'));
                else
                        return std::make_pair(false, parameter);
        }

        bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
        {
                /* When TS is equal, the alphabetically later one wins */
                return (their_param < our_param);
        }
        
        ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
        {
                if (adding)
                {
                        chanrec* c = NULL;

                        if (!ServerInstance->IsChannel(parameter.c_str()))
                        {
                                source->WriteServ("403 %s %s :Invalid channel name",source->nick, parameter.c_str());
                                parameter.clear();
                                return MODEACTION_DENY;
                        }

                        c = ServerInstance->FindChan(parameter);
                        if (c)
                        {
                                /* Fix by brain: Dont let a channel be linked to *itself* either */
                                if (IS_LOCAL(source))
                                {
                                        if ((c == channel) || (c->IsModeSet('L')))
                                        {
                                                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());
                                                parameter.clear();
                                                return MODEACTION_DENY;
                                        }
                                        else
                                        {
                                                for (chan_hash::const_iterator i = ServerInstance->chanlist->begin(); i != ServerInstance->chanlist->end(); i++)
                                                {
                                                        if ((i->second != channel) && (i->second->IsModeSet('L')) && (irc::string(i->second->GetModeParameter('L').c_str()) == irc::string(channel->name)))
                                                        {
                                                                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);
                                                                return MODEACTION_DENY;
                                                        }
                                                }
                                        }
                                }
                        }

                        channel->SetMode('L', true);
                        channel->SetModeParam('L', parameter.c_str(), true);
                        return MODEACTION_ALLOW;
                }
                else
                {
                        if (channel->IsModeSet('L'))
                        {
                                channel->SetMode('L', false);
                                return MODEACTION_ALLOW;
                        }
                }

                return MODEACTION_DENY;
                
        }
};

class ModuleRedirect : public Module
{
        
        Redirect* re;
        
 public:
 
        ModuleRedirect(InspIRCd* Me)
                : Module(Me)
        {
                
                re = new Redirect(ServerInstance);
                if (!ServerInstance->AddMode(re, 'L'))
                        throw ModuleException("Could not add new modes!");
        }
        
        void Implements(char* List)
        {
                List[I_OnUserPreJoin] = 1;
        }

        virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname, std::string &privs)
        {
                if (chan)
                {
                        if (chan->IsModeSet('L') && chan->limit)
                        {
                                if (chan->GetUserCounter() >= chan->limit)
                                {
                                        std::string channel = chan->GetModeParameter('L');

                                        /* sometimes broken ulines can make circular or chained +L, avoid this */
                                        chanrec* destchan = NULL;
                                        destchan = ServerInstance->FindChan(channel);
                                        if (destchan && destchan->IsModeSet('L'))
                                        {
                                                user->WriteServ("470 %s :%s is full, but has a circular redirect (+L), not following redirection to %s", user->nick, cname, channel.c_str());
                                                return 1;
                                        }

                                        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());
                                        chanrec::JoinUser(ServerInstance, user, channel.c_str(), false, "", ServerInstance->Time(true));
                                        return 1;
                                }
                        }
                }
                return 0;
        }

        virtual ~ModuleRedirect()
        {
                ServerInstance->Modes->DelMode(re);
                DELETE(re);
        }
        
        virtual Version GetVersion()
        {
                return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
        }
};

MODULE_INIT(ModuleRedirect)