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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 +f (message flood protection) */
/** Holds flood settings and state for mode +f
*/
class floodsettings : public classbase
{
public:
bool ban;
int secs;
int lines;
time_t reset;
std::map<userrec*,int> counters;
floodsettings() : ban(0), secs(0), lines(0) {};
floodsettings(bool a, int b, int c) : ban(a), secs(b), lines(c)
{
reset = time(NULL) + secs;
};
void addmessage(userrec* who)
{
std::map<userrec*,int>::iterator iter = counters.find(who);
if (iter != counters.end())
{
iter->second++;
}
else
{
counters[who] = 1;
}
if (time(NULL) > reset)
{
counters.clear();
reset = time(NULL) + secs;
}
}
bool shouldkick(userrec* who)
{
std::map<userrec*,int>::iterator iter = counters.find(who);
if (iter != counters.end())
{
return (iter->second >= this->lines);
}
else return false;
}
void clear(userrec* who)
{
std::map<userrec*,int>::iterator iter = counters.find(who);
if (iter != counters.end())
{
counters.erase(iter);
}
}
};
/** Handles channel mode +f
*/
class MsgFlood : public ModeHandler
{
public:
MsgFlood(InspIRCd* Instance) : ModeHandler(Instance, 'f', 1, 0, false, MODETYPE_CHANNEL, false) { }
ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string ¶meter)
{
floodsettings* x;
if (channel->GetExt("flood",x))
return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+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)
{
floodsettings *f;
if (adding)
{
char ndata[MAXBUF];
char* data = ndata;
strlcpy(ndata,parameter.c_str(),MAXBUF);
char* lines = data;
char* secs = NULL;
bool ban = false;
if (*data == '*')
{
ban = true;
lines++;
}
else
{
ban = false;
}
while (*data)
{
if (*data == ':')
{
*data = 0;
data++;
secs = data;
break;
}
else data++;
}
if (secs)
{
/* Set up the flood parameters for this channel */
int nlines = atoi(lines);
int nsecs = atoi(secs);
if ((nlines<1) || (nsecs<1))
{
source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
parameter.clear();
return MODEACTION_DENY;
}
else
{
if (!channel->GetExt("flood", f))
{
parameter = std::string(ban ? "*" : "") + ConvToStr(nlines) + ":" +ConvToStr(nsecs);
floodsettings *f = new floodsettings(ban,nsecs,nlines);
channel->Extend("flood",f);
channel->SetMode('f', true);
channel->SetModeParam('f', parameter.c_str(), true);
return MODEACTION_ALLOW;
}
else
{
std::string cur_param = channel->GetModeParameter('f');
parameter = std::string(ban ? "*" : "") + ConvToStr(nlines) + ":" +ConvToStr(nsecs);
if (cur_param == parameter)
{
// mode params match
return MODEACTION_DENY;
}
else
{
if (((nlines != f->lines) || (nsecs != f->secs)) && ((nsecs > 0) && (nlines > 0)) || (ban != f->ban))
{
delete f;
floodsettings *f = new floodsettings(ban,nsecs,nlines);
channel->Shrink("flood");
channel->Extend("flood",f);
channel->SetModeParam('f', cur_param.c_str(), false);
channel->SetModeParam('f', parameter.c_str(), true);
return MODEACTION_ALLOW;
}
else
{
return MODEACTION_DENY;
}
}
}
}
}
else
{
source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
parameter.clear();
return MODEACTION_DENY;
}
}
else
{
if (channel->GetExt("flood", f))
{
DELETE(f);
channel->Shrink("flood");
channel->SetMode('f', false);
return MODEACTION_ALLOW;
}
}
return MODEACTION_DENY;
}
};
class ModuleMsgFlood : public Module
{
MsgFlood* mf;
public:
ModuleMsgFlood(InspIRCd* Me)
: Module(Me)
{
mf = new MsgFlood(ServerInstance);
if (!ServerInstance->AddMode(mf, 'f'))
throw ModuleException("Could not add new modes!");
}
void ProcessMessages(userrec* user,chanrec* dest, const std::string &text)
{
if (!IS_LOCAL(user) || CHANOPS_EXEMPT(ServerInstance, 'f') && dest->GetStatus(user) == STATUS_OP)
{
return;
}
floodsettings *f;
if (dest->GetExt("flood", f))
{
f->addmessage(user);
if (f->shouldkick(user))
{
/* Youre outttta here! */
f->clear(user);
if (f->ban)
{
const char* parameters[3];
parameters[0] = dest->name;
parameters[1] = "+b";
parameters[2] = user->MakeWildHost();
ServerInstance->SendMode(parameters,3,user);
std::deque<std::string> n;
/* Propogate the ban to other servers.
* We dont know what protocol we may be using,
* so this event is picked up by our protocol
* module and formed into a ban command that
* suits the protocol in use.
*/
n.push_back(dest->name);
n.push_back("+b");
n.push_back(user->MakeWildHost());
Event rmode((char *)&n, NULL, "send_mode");
rmode.Send(ServerInstance);
}
char kickmessage[MAXBUF];
snprintf(kickmessage, MAXBUF, "Channel flood triggered (limit is %d lines in %d secs)", f->lines, f->secs);
dest->ServerKickUser(user, kickmessage, true);
}
}
}
virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status, const CUList &exempt_list)
{
if (target_type == TYPE_CHANNEL)
{
ProcessMessages(user,(chanrec*)dest,text);
}
}
virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status, const CUList &exempt_list)
{
if (target_type == TYPE_CHANNEL)
{
ProcessMessages(user,(chanrec*)dest,text);
}
}
void OnChannelDelete(chanrec* chan)
{
floodsettings* f;
if (chan->GetExt("flood", f))
{
DELETE(f);
chan->Shrink("flood");
}
}
void Implements(char* List)
{
List[I_OnChannelDelete] = List[I_OnUserNotice] = List[I_OnUserMessage] = 1;
}
virtual ~ModuleMsgFlood()
{
ServerInstance->Modes->DelMode(mf);
DELETE(mf);
}
virtual Version GetVersion()
{
return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
}
};
MODULE_INIT(ModuleMsgFlood)
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