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 "configreader.h"
  25 #include "inspircd.h"
  26
  27 /* $ModDesc: Provides channel mode +j (join flood protection) */
  28
  29
  30
  31 class joinfloodsettings : public classbase
  32 {
  33  public:
  34
  35         int secs;
  36         int joins;
  37         time_t reset;
  38         time_t unlocktime;
  39         int counter;
  40         bool locked;
  41
  42         joinfloodsettings() : secs(0), joins(0) {};
  43         joinfloodsettings(int b, int c) : secs(b), joins(c)
  44         {
  45                 reset = time(NULL) + secs;
  46                 counter = 0;
  47                 locked = false;
  48         };
  49
  50         void addjoin()
  51         {
  52                 counter++;
  53                 if (time(NULL) > reset)
  54                 {
  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                 counter = 0;
  68         }
  69
  70         bool islocked()
  71         {
  72                 if (locked)
  73                 {
  74                         if (time(NULL) > unlocktime)
  75                         {
  76                                 locked = false;
  77                                 return false;
  78                         }
  79                         else
  80                         {
  81                                 return true;
  82                         }
  83                 }
  84                 return false;
  85         }
  86
  87         void lock()
  88         {
  89                 locked = true;
  90                 unlocktime = time(NULL) + 60;
  91         }
  92
  93 };
  94
  95 class JoinFlood : public ModeHandler
  96 {
  97  public:
  98         JoinFlood(InspIRCd* Instance) : ModeHandler(Instance, 'j', 1, 0, false, MODETYPE_CHANNEL, false) { }
  99
 100         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 101         {
 102                 joinfloodsettings* x;
 103                 if (channel->GetExt("joinflood",x))
 104                         return std::make_pair(true, ConvToStr(x->joins)+":"+ConvToStr(x->secs));
 105                 else
 106                         return std::make_pair(false, parameter);
 107         }
 108
 109         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 110         {
 111                 /* When TS is equal, the alphabetically later one wins */
 112                 return (their_param < our_param);
 113         }
 114
 115         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 116         {
 117                 joinfloodsettings* dummy;
 118
 119                 if (adding)
 120                 {
 121                         char ndata[MAXBUF];
 122                         char* data = ndata;
 123                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 124                         char* joins = data;
 125                         char* secs = NULL;
 126                         while (*data)
 127                         {
 128                                 if (*data == ':')
 129                                 {
 130                                         *data = 0;
 131                                         data++;
 132                                         secs = data;
 133                                         break;
 134                                 }
 135                                 else data++;
 136                         }
 137                         if (secs)
 138                         {
 139                                 /* Set up the flood parameters for this channel */
 140                                 int njoins = atoi(joins);
 141                                 int nsecs = atoi(secs);
 142                                 if ((njoins<1) || (nsecs<1))
 143                                 {
 144                                         source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 145                                         parameter = "";
 146                                         return MODEACTION_DENY;
 147                                 }
 148                                 else
 149                                 {
 150                                         if (!channel->GetExt("joinflood", dummy))
 151                                         {
 152                                                 parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
 153                                                 joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
 154                                                 channel->Extend("joinflood", f);
 155                                                 channel->SetMode('j', true);
 156                                                 channel->SetModeParam('j', parameter.c_str(), true);
 157                                                 return MODEACTION_ALLOW;
 158                                         }
 159                                 }
 160                         }
 161                         else
 162                         {
 163                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 164                                 return MODEACTION_DENY;
 165                         }
 166                 }
 167                 else
 168                 {
 169                         if (channel->GetExt("joinflood", dummy))
 170                         {
 171                                 joinfloodsettings *f;
 172                                 channel->GetExt("joinflood", f);
 173                                 DELETE(f);
 174                                 channel->Shrink("joinflood");
 175                                 channel->SetMode('j', false);
 176                                 return MODEACTION_ALLOW;
 177                         }
 178                 }
 179                 return MODEACTION_DENY;
 180         }
 181 };
 182
 183 class ModuleJoinFlood : public Module
 184 {
 185
 186         JoinFlood* jf;
 187
 188  public:
 189
 190         ModuleJoinFlood(InspIRCd* Me)
 191                 : Module::Module(Me)
 192         {
 193
 194                 jf = new JoinFlood(ServerInstance);
 195                 ServerInstance->AddMode(jf, 'j');
 196         }
 197
 198         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname)
 199         {
 200                 if (chan)
 201                 {
 202                         joinfloodsettings *f;
 203                         if (chan->GetExt("joinflood", f))
 204                         {
 205                                 if (f->islocked())
 206                                 {
 207                                         user->WriteServ("609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 208                                         return 1;
 209                                 }
 210                         }
 211                 }
 212                 return 0;
 213         }
 214
 215         virtual void OnUserJoin(userrec* user, chanrec* channel)
 216         {
 217                 joinfloodsettings *f;
 218                 if (channel->GetExt("joinflood",f))
 219                 {
 220                         f->addjoin();
 221                         if (f->shouldlock())
 222                         {
 223                                 f->clear();
 224                                 f->lock();
 225                                 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);
 226                         }
 227                 }
 228         }
 229
 230         void OnChannelDelete(chanrec* chan)
 231         {
 232                 joinfloodsettings *f;
 233                 if (chan->GetExt("joinflood",f))
 234                 {
 235                         DELETE(f);
 236                         chan->Shrink("joinflood");
 237                 }
 238         }
 239
 240         void Implements(char* List)
 241         {
 242                 List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 243         }
 244
 245         virtual ~ModuleJoinFlood()
 246         {
 247                 DELETE(jf);
 248         }
 249
 250         virtual Version GetVersion()
 251         {
 252                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 253         }
 254 };
 255
 256
 257 class ModuleJoinFloodFactory : public ModuleFactory
 258 {
 259  public:
 260         ModuleJoinFloodFactory()
 261         {
 262         }
 263
 264         ~ModuleJoinFloodFactory()
 265         {
 266         }
 267
 268         virtual Module * CreateModule(InspIRCd* Me)
 269         {
 270                 return new ModuleJoinFlood(Me);
 271         }
 272
 273 };
 274
 275
 276 extern "C" void * init_module( void )
 277 {
 278         return new ModuleJoinFloodFactory;
 279 }
 280