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
  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         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 103         {
 104                 if (adding)
 105                 {
 106                         char ndata[MAXBUF];
 107                         char* data = ndata;
 108                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 109                         char* joins = data;
 110                         char* secs = NULL;
 111                         while (*data)
 112                         {
 113                                 if (*data == ':')
 114                                 {
 115                                         *data = 0;
 116                                         data++;
 117                                         secs = data;
 118                                         break;
 119                                 }
 120                                 else data++;
 121                         }
 122                         if (secs)
 123                         {
 124                                 /* Set up the flood parameters for this channel */
 125                                 int njoins = atoi(joins);
 126                                 int nsecs = atoi(secs);
 127                                 if ((njoins<1) || (nsecs<1))
 128                                 {
 129                                         WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 130                                         parameter = "";
 131                                         return MODEACTION_DENY;
 132                                 }
 133                                 else
 134                                 {
 135                                         if (!channel->GetExt("joinflood"))
 136                                         {
 137                                                 parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
 138                                                 joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
 139                                                 channel->Extend("joinflood",(char*)f);
 140                                                 channel->SetMode('j', true);
 141                                                 channel->SetModeParam('j', parameter.c_str(), true);
 142                                                 return MODEACTION_ALLOW;
 143                                         }
 144                                 }
 145                         }
 146                         else
 147                         {
 148                                 WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 149                                 return MODEACTION_DENY;
 150                         }
 151                 }
 152                 else
 153                 {
 154                         if (channel->GetExt("joinflood"))
 155                         {
 156                                 joinfloodsettings *f = (joinfloodsettings*)channel->GetExt("joinflood");
 157                                 DELETE(f);
 158                                 channel->Shrink("joinflood");
 159                                 channel->SetMode('j', false);
 160                                 return MODEACTION_ALLOW;
 161                         }
 162                 }
 163                 return MODEACTION_DENY;
 164         }
 165 };
 166
 167 class ModuleJoinFlood : public Module
 168 {
 169         Server *Srv;
 170         JoinFlood* jf;
 171
 172  public:
 173
 174         ModuleJoinFlood(Server* Me)
 175                 : Module::Module(Me)
 176         {
 177                 Srv = Me;
 178                 jf = new JoinFlood();
 179                 Srv->AddMode(jf, 'j');
 180         }
 181
 182         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname)
 183         {
 184                 if (chan)
 185                 {
 186                         joinfloodsettings *f = (joinfloodsettings*)chan->GetExt("joinflood");
 187                         if (f)
 188                         {
 189                                 if (f->islocked())
 190                                 {
 191                                         WriteServ(user->fd,"609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 192                                         return 1;
 193                                 }
 194                         }
 195                 }
 196                 return 0;
 197         }
 198
 199         virtual void OnUserJoin(userrec* user, chanrec* channel)
 200         {
 201                 joinfloodsettings *f = (joinfloodsettings*)channel->GetExt("joinflood");
 202                 if (f)
 203                 {
 204                         f->addjoin();
 205                         if (f->shouldlock())
 206                         {
 207                                 f->clear();
 208                                 f->lock();
 209                                 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);
 210                         }
 211                 }
 212         }
 213
 214         void OnChannelDelete(chanrec* chan)
 215         {
 216                 if (chan->GetExt("joinflood"))
 217                 {
 218                         joinfloodsettings *f = (joinfloodsettings*)chan->GetExt("joinflood");
 219                         DELETE(f);
 220                         chan->Shrink("joinflood");
 221                 }
 222         }
 223
 224         void Implements(char* List)
 225         {
 226                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 227         }
 228
 229         virtual void On005Numeric(std::string &output)
 230         {
 231                 InsertMode(output, "j", 3);
 232         }
 233
 234         virtual ~ModuleJoinFlood()
 235         {
 236                 DELETE(jf);
 237         }
 238
 239         virtual Version GetVersion()
 240         {
 241                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 242         }
 243 };
 244
 245
 246 class ModuleJoinFloodFactory : public ModuleFactory
 247 {
 248  public:
 249         ModuleJoinFloodFactory()
 250         {
 251         }
 252
 253         ~ModuleJoinFloodFactory()
 254         {
 255         }
 256
 257         virtual Module * CreateModule(Server* Me)
 258         {
 259                 return new ModuleJoinFlood(Me);
 260         }
 261
 262 };
 263
 264
 265 extern "C" void * init_module( void )
 266 {
 267         return new ModuleJoinFloodFactory;
 268 }
 269