src/modules/m_joinflood.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include <stdio.h>
  20 #include <map>
  21 #include "users.h"
  22 #include "channels.h"
  23 #include "modules.h"
  24 #include "helperfuncs.h"
  25
  26 /* $ModDesc: Provides channel mode +j (join flood protection) */
  27
  28 class joinfloodsettings : public classbase
  29 {
  30  public:
  31
  32         int secs;
  33         int joins;
  34         time_t reset;
  35         time_t unlocktime;
  36         int counter;
  37         bool locked;
  38
  39         joinfloodsettings() : secs(0), joins(0) {};
  40         joinfloodsettings(int b, int c) : secs(b), joins(c)
  41         {
  42                 reset = time(NULL) + secs;
  43                 counter = 0;
  44                 locked = false;
  45                 log(DEBUG,"Create new joinfloodsettings: %lu %lu",time(NULL),reset);
  46         };
  47
  48         void addjoin()
  49         {
  50                 counter++;
  51                 log(DEBUG,"joinflood counter is %d",counter);
  52                 if (time(NULL) > reset)
  53                 {
  54                         log(DEBUG,"joinflood counter reset");
  55                         counter = 0;
  56                         reset = time(NULL) + secs;
  57                 }
  58         }
  59
  60         bool shouldlock()
  61         {
  62                 return (counter >= this->joins);
  63         }
  64
  65         void clear()
  66         {
  67                 log(DEBUG,"joinflood counter clear");
  68                 counter = 0;
  69         }
  70
  71         bool islocked()
  72         {
  73                 if (locked)
  74                 {
  75                         if (time(NULL) > unlocktime)
  76                         {
  77                                 locked = false;
  78                                 return false;
  79                         }
  80                         else
  81                         {
  82                                 return true;
  83                         }
  84                 }
  85                 return false;
  86         }
  87
  88         void lock()
  89         {
  90                 log(DEBUG,"joinflood lock");
  91                 locked = true;
  92                 unlocktime = time(NULL) + 60;
  93         }
  94
  95 };
  96
  97 class JoinFlood : public ModeHandler
  98 {
  99  public:
 100         JoinFlood() : ModeHandler('j', 1, 0, false, MODETYPE_CHANNEL, false) { }
 101
 102         std::pair<bool,std::string> ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 103         {
 104                 joinfloodsettings* x;
 105                 if (channel->GetExt("joinflood",x))
 106                         return std::make_pair(true, ConvToStr(x->joins)+":"+ConvToStr(x->secs));
 107                 else
 108                         return std::make_pair(false, parameter);
 109         }
 110
 111         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 112         {
 113                 joinfloodsettings* dummy;
 114
 115                 if (adding)
 116                 {
 117                         char ndata[MAXBUF];
 118                         char* data = ndata;
 119                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 120                         char* joins = data;
 121                         char* secs = NULL;
 122                         while (*data)
 123                         {
 124                                 if (*data == ':')
 125                                 {
 126                                         *data = 0;
 127                                         data++;
 128                                         secs = data;
 129                                         break;
 130                                 }
 131                                 else data++;
 132                         }
 133                         if (secs)
 134                         {
 135                                 /* Set up the flood parameters for this channel */
 136                                 int njoins = atoi(joins);
 137                                 int nsecs = atoi(secs);
 138                                 if ((njoins<1) || (nsecs<1))
 139                                 {
 140                                         WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 141                                         parameter = "";
 142                                         return MODEACTION_DENY;
 143                                 }
 144                                 else
 145                                 {
 146                                         if (!channel->GetExt("joinflood", dummy))
 147                                         {
 148                                                 parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
 149                                                 joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
 150                                                 channel->Extend("joinflood", f);
 151                                                 channel->SetMode('j', true);
 152                                                 channel->SetModeParam('j', parameter.c_str(), true);
 153                                                 return MODEACTION_ALLOW;
 154                                         }
 155                                 }
 156                         }
 157                         else
 158                         {
 159                                 WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 160                                 return MODEACTION_DENY;
 161                         }
 162                 }
 163                 else
 164                 {
 165                         if (channel->GetExt("joinflood", dummy))
 166                         {
 167                                 joinfloodsettings *f;
 168                                 channel->GetExt("joinflood", f);
 169                                 DELETE(f);
 170                                 channel->Shrink("joinflood");
 171                                 channel->SetMode('j', false);
 172                                 return MODEACTION_ALLOW;
 173                         }
 174                 }
 175                 return MODEACTION_DENY;
 176         }
 177 };
 178
 179 class ModuleJoinFlood : public Module
 180 {
 181         Server *Srv;
 182         JoinFlood* jf;
 183
 184  public:
 185
 186         ModuleJoinFlood(Server* Me)
 187                 : Module::Module(Me)
 188         {
 189                 Srv = Me;
 190                 jf = new JoinFlood();
 191                 Srv->AddMode(jf, 'j');
 192         }
 193
 194         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname)
 195         {
 196                 if (chan)
 197                 {
 198                         joinfloodsettings *f;
 199                         if (chan->GetExt("joinflood", f))
 200                         {
 201                                 if (f->islocked())
 202                                 {
 203                                         WriteServ(user->fd,"609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 204                                         return 1;
 205                                 }
 206                         }
 207                 }
 208                 return 0;
 209         }
 210
 211         virtual void OnUserJoin(userrec* user, chanrec* channel)
 212         {
 213                 joinfloodsettings *f;
 214                 if (channel->GetExt("joinflood",f))
 215                 {
 216                         f->addjoin();
 217                         if (f->shouldlock())
 218                         {
 219                                 f->clear();
 220                                 f->lock();
 221                                 WriteChannelWithServ((char*)Srv->GetServerName().c_str(), channel, "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);
 222                         }
 223                 }
 224         }
 225
 226         void OnChannelDelete(chanrec* chan)
 227         {
 228                 joinfloodsettings *f;
 229                 if (chan->GetExt("joinflood",f))
 230                 {
 231                         DELETE(f);
 232                         chan->Shrink("joinflood");
 233                 }
 234         }
 235
 236         void Implements(char* List)
 237         {
 238                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 239         }
 240
 241         virtual void On005Numeric(std::string &output)
 242         {
 243                 InsertMode(output, "j", 3);
 244         }
 245
 246         virtual ~ModuleJoinFlood()
 247         {
 248                 DELETE(jf);
 249         }
 250
 251         virtual Version GetVersion()
 252         {
 253                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 254         }
 255 };
 256
 257
 258 class ModuleJoinFloodFactory : public ModuleFactory
 259 {
 260  public:
 261         ModuleJoinFloodFactory()
 262         {
 263         }
 264
 265         ~ModuleJoinFloodFactory()
 266         {
 267         }
 268
 269         virtual Module * CreateModule(Server* Me)
 270         {
 271                 return new ModuleJoinFlood(Me);
 272         }
 273
 274 };
 275
 276
 277 extern "C" void * init_module( void )
 278 {
 279         return new ModuleJoinFloodFactory;
 280 }
 281