/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2009 InspIRCd Development Team
* See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
/* $ModDesc: Provides channel mode +F (nick flood protection) */
/** Holds settings and state associated with channel mode +F
*/
class nickfloodsettings : public classbase
{
private:
InspIRCd* ServerInstance;
public:
int secs;
int nicks;
time_t reset;
time_t unlocktime;
int counter;
bool locked;
nickfloodsettings(InspIRCd *Instance, int b, int c) : ServerInstance(Instance), secs(b), nicks(c)
{
reset = Instance->Time() + secs;
counter = 0;
locked = false;
};
void addnick()
{
counter++;
if (ServerInstance->Time() > reset)
{
counter = 0;
reset = ServerInstance->Time() + secs;
}
}
bool shouldlock()
{
/* XXX HACK: using counter + 1 here now to allow the counter to only be incremented
* on successful nick changes; this will be checked before the counter is
* incremented.
*/
return (counter + 1 >= this->nicks);
}
void clear()
{
counter = 0;
}
bool islocked()
{
if (locked)
{
if (ServerInstance->Time() > unlocktime)
{
locked = false;
return false;
}
else
{
return true;
}
}
return false;
}
void lock()
{
locked = true;
unlocktime = ServerInstance->Time() + 60;
}
};
/** Handles channel mode +j
*/
class NickFlood : public ModeHandler
{
public:
NickFlood(InspIRCd* Instance) : ModeHandler(Instance, 'F', 1, 0, false, MODETYPE_CHANNEL, false) { }
ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string ¶meter)
{
nickfloodsettings* x;
if (channel->GetExt("nickflood",x))
return std::make_pair(true, ConvToStr(x->nicks)+":"+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, Channel* channel)
{
/* When TS is equal, the alphabetically later one wins */
return (their_param < our_param);
}
ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding, bool)
{
nickfloodsettings* dummy;
if (adding)
{
char ndata[MAXBUF];
char* data = ndata;
strlcpy(ndata,parameter.c_str(),MAXBUF);
char* nicks = 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 nnicks = atoi(nicks);
int nsecs = atoi(secs);
if ((nnicks<1) || (nsecs<1))
{
source->WriteNumeric(608, "%s %s :Invalid flood parameter",source->nick.c_str(),channel->name.c_str());
parameter.clear();
return MODEACTION_DENY;
}
else
{
if (!channel->GetExt("nickflood", dummy))
{
parameter = ConvToStr(nnicks) + ":" +ConvToStr(nsecs);
nickfloodsettings *f = new nickfloodsettings(ServerInstance, nsecs, nnicks);
channel->Extend("nickflood", f);
channel->SetModeParam('F', parameter);
return MODEACTION_ALLOW;
}
else
{
std::string cur_param = channel->GetModeParameter('F');
parameter = ConvToStr(nnicks) + ":" +ConvToStr(nsecs);
if (cur_param == parameter)
{
// mode params match
return MODEACTION_DENY;
}
else
{
// new mode param, replace old with new
if ((nsecs > 0) && (nnicks > 0))
{
nickfloodsettings* f;
channel->GetExt("nickflood", f);
delete f;
f = new nickfloodsettings(ServerInstance, nsecs, nnicks);
channel->Shrink("nickflood");
channel->Extend("nickflood", f);
channel->SetModeParam('F', parameter);
return MODEACTION_ALLOW;
}
else
{
return MODEACTION_DENY;
}
}
}
}
}
else
{
source->WriteNumeric(608, "%s %s :Invalid flood parameter",source->nick.c_str(),channel->name.c_str());
return MODEACTION_DENY;
}
}
else
{
if (channel->GetExt("nickflood", dummy))
{
nickfloodsettings *f;
channel->GetExt("nickflood", f);
delete f;
channel->Shrink("nickflood");
channel->SetModeParam('F', "");
return MODEACTION_ALLOW;
}
}
return MODEACTION_DENY;
}
};
class ModuleNickFlood : public Module
{
NickFlood* jf;
public:
ModuleNickFlood(InspIRCd* Me)
: Module(Me)
{
jf = new NickFlood(ServerInstance);
if (!ServerInstance->Modes->AddMode(jf))
throw ModuleException("Could not add new modes!");
Implementation eventlist[] = { I_OnChannelDelete, I_OnUserPreNick, I_OnUserPostNick };
ServerInstance->Modules->Attach(eventlist, this, 3);
}
virtual int OnUserPreNick(User* user, const std::string &newnick)
{
if (isdigit(newnick[0])) /* allow switches to UID */
return 0;
for (UCListIter i = user->chans.begin(); i != user->chans.end(); i++)
{
Channel *channel = i->first;
nickfloodsettings *f;
if (channel->GetExt("nickflood", f))
{
if (CHANOPS_EXEMPT(ServerInstance, 'F') && channel->GetStatus(user) == STATUS_OP)
continue;
if (f->islocked())
{
user->WriteNumeric(447, "%s :%s has been locked for nickchanges for 60 seconds because there have been more than %d nick changes in %d seconds", user->nick.c_str(), channel->name.c_str(), f->nicks, f->secs);
return 1;
}
if (f->shouldlock())
{
f->clear();
f->lock();
channel->WriteChannelWithServ((char*)ServerInstance->Config->ServerName, "NOTICE %s :No nick changes are allowed for 60 seconds because there have been more than %d nick changes in %d seconds.", channel->name.c_str(), f->nicks, f->secs);
return 1;
}
}
}
return 0;
}
/*
* XXX: HACK: We do the increment on the *POST* event here (instead of all together) because we have no way of knowing whether other modules would block a nickchange.
*/
virtual void OnUserPostNick(User* user, const std::string &oldnick)
{
if (isdigit(user->nick[0])) /* allow switches to UID */
return;
for (UCListIter i = user->chans.begin(); i != user->chans.end(); ++i)
{
Channel *channel = i->first;
nickfloodsettings *f;
if (channel->GetExt("nickflood", f))
{
if (CHANOPS_EXEMPT(ServerInstance, 'F') && channel->GetStatus(user) == STATUS_OP)
return;
/* moved this here to avoid incrementing the counter for nick
* changes that are denied for some other reason (bans, +N, etc.)
* per bug #874.
*/
f->addnick();
}
}
return;
}
void OnChannelDelete(Channel* chan)
{
nickfloodsettings *f;
if (chan->GetExt("nickflood",f))
{
delete f;
chan->Shrink("nickflood");
}
}
virtual ~ModuleNickFlood()
{
ServerInstance->Modes->DelMode(jf);
delete jf;
}
virtual Version GetVersion()
{
return Version("$Id$", VF_COMMON | VF_VENDOR, API_VERSION);
}
};
MODULE_INIT(ModuleNickFlood)
