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/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2007 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 +j (join flood protection) */
/** Holds settings and state associated with channel mode +j
*/
class joinfloodsettings : public classbase
{
public:
int secs;
int joins;
time_t reset;
time_t unlocktime;
int counter;
bool locked;
InspIRCd* ServerInstance;
joinfloodsettings() : secs(0), joins(0) {};
joinfloodsettings(int b, int c) : secs(b), joins(c)
{
reset = time(NULL) + secs;
counter = 0;
locked = false;
};
void addjoin()
{
counter++;
if (time(NULL) > reset)
{
counter = 0;
reset = time(NULL) + secs;
}
}
bool shouldlock()
{
return (counter >= this->joins);
}
void clear()
{
counter = 0;
}
bool islocked()
{
if (locked)
{
if (time(NULL) > unlocktime)
{
locked = false;
return false;
}
else
{
return true;
}
}
return false;
}
void lock()
{
locked = true;
unlocktime = time(NULL) + 60;
}
};
/** Handles channel mode +j
*/
class JoinFlood : public ModeHandler
{
public:
JoinFlood(InspIRCd* Instance) : ModeHandler(Instance, 'j', 1, 0, false, MODETYPE_CHANNEL, false) { }
ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string ¶meter)
{
joinfloodsettings* x;
if (channel->GetExt("joinflood",x))
return std::make_pair(true, ConvToStr(x->joins)+":"+ConvToStr(x->secs));
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 ¶meter, bool adding)
{
joinfloodsettings* dummy;
if (adding)
{
char ndata[MAXBUF];
char* data = ndata;
strlcpy(ndata,parameter.c_str(),MAXBUF);
char* joins = data;
char* secs = NULL;
while (*data)
{
if (*data == ':')
{
*data = 0;
data++;
secs = data;
break;
}
else data++;
}
if (secs)
{
/* Set up the flood parameters for this channel */
int njoins = atoi(joins);
int nsecs = atoi(secs);
if ((njoins<1) || (nsecs<1))
{
source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
parameter.clear();
return MODEACTION_DENY;
}
else
{
if (!channel->GetExt("joinflood", dummy))
{
parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
channel->Extend("joinflood", f);
channel->SetMode('j', true);
channel->SetModeParam('j', parameter.c_str(), true);
return MODEACTION_ALLOW;
}
else
{
std::string cur_param = channel->GetModeParameter('j');
parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
if (cur_param == parameter)
{
// mode params match
return MODEACTION_DENY;
}
else
{
// new mode param, replace old with new
if ((nsecs > 0) && (njoins > 0))
{
joinfloodsettings* f;
channel->GetExt("joinflood", f);
delete f;
f = new joinfloodsettings(nsecs,njoins);
channel->Shrink("joinflood");
channel->Extend("joinflood", f);
channel->SetModeParam('j', cur_param.c_str(), false);
channel->SetModeParam('j', parameter.c_str(), true);
return MODEACTION_ALLOW;
}
else
{
return MODEACTION_DENY;
}
}
}
}
}
else
{
source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
return MODEACTION_DENY;
}
}
else
{
if (channel->GetExt("joinflood", dummy))
{
joinfloodsettings *f;
channel->GetExt("joinflood", f);
DELETE(f);
channel->Shrink("joinflood");
channel->SetMode('j', false);
return MODEACTION_ALLOW;
}
}
return MODEACTION_DENY;
}
};
class ModuleJoinFlood : public Module
{
JoinFlood* jf;
public:
ModuleJoinFlood(InspIRCd* Me)
: Module(Me)
{
jf = new JoinFlood(ServerInstance);
if (!ServerInstance->AddMode(jf, 'j'))
throw ModuleException("Could not add new modes!");
}
virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname, std::string &privs)
{
if (chan)
{
joinfloodsettings *f;
if (chan->GetExt("joinflood", f))
{
if (f->islocked())
{
user->WriteServ("609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
return 1;
}
}
}
return 0;
}
virtual void OnUserJoin(userrec* user, chanrec* channel, bool &silent)
{
joinfloodsettings *f;
if (channel->GetExt("joinflood",f))
{
f->addjoin();
if (f->shouldlock())
{
f->clear();
f->lock();
channel->WriteChannelWithServ((char*)ServerInstance->Config->ServerName, "NOTICE %s :This channel has been closed to new users for 60 seconds because there have been more than %d joins in %d seconds.", channel->name, f->joins, f->secs);
}
}
}
void OnChannelDelete(chanrec* chan)
{
joinfloodsettings *f;
if (chan->GetExt("joinflood",f))
{
DELETE(f);
chan->Shrink("joinflood");
}
}
void Implements(char* List)
{
List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
}
virtual ~ModuleJoinFlood()
{
ServerInstance->Modes->DelMode(jf);
DELETE(jf);
}
virtual Version GetVersion()
{
return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
}
};
MODULE_INIT(ModuleJoinFlood)
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