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                 joinfloodsettings* dummy;
 105
 106                 if (adding)
 107                 {
 108                         char ndata[MAXBUF];
 109                         char* data = ndata;
 110                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 111                         char* joins = data;
 112                         char* secs = NULL;
 113                         while (*data)
 114                         {
 115                                 if (*data == ':')
 116                                 {
 117                                         *data = 0;
 118                                         data++;
 119                                         secs = data;
 120                                         break;
 121                                 }
 122                                 else data++;
 123                         }
 124                         if (secs)
 125                         {
 126                                 /* Set up the flood parameters for this channel */
 127                                 int njoins = atoi(joins);
 128                                 int nsecs = atoi(secs);
 129                                 if ((njoins<1) || (nsecs<1))
 130                                 {
 131                                         WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 132                                         parameter = "";
 133                                         return MODEACTION_DENY;
 134                                 }
 135                                 else
 136                                 {
 137                                         if (!channel->GetExt("joinflood", dummy))
 138                                         {
 139                                                 parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
 140                                                 joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
 141                                                 channel->Extend("joinflood", f);
 142                                                 channel->SetMode('j', true);
 143                                                 channel->SetModeParam('j', parameter.c_str(), true);
 144                                                 return MODEACTION_ALLOW;
 145                                         }
 146                                 }
 147                         }
 148                         else
 149                         {
 150                                 WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 151                                 return MODEACTION_DENY;
 152                         }
 153                 }
 154                 else
 155                 {
 156                         if (channel->GetExt("joinflood", dummy))
 157                         {
 158                                 joinfloodsettings *f;
 159                                 channel->GetExt("joinflood", f);
 160                                 DELETE(f);
 161                                 channel->Shrink("joinflood");
 162                                 channel->SetMode('j', false);
 163                                 return MODEACTION_ALLOW;
 164                         }
 165                 }
 166                 return MODEACTION_DENY;
 167         }
 168 };
 169
 170 class ModuleJoinFlood : public Module
 171 {
 172         Server *Srv;
 173         JoinFlood* jf;
 174
 175  public:
 176
 177         ModuleJoinFlood(Server* Me)
 178                 : Module::Module(Me)
 179         {
 180                 Srv = Me;
 181                 jf = new JoinFlood();
 182                 Srv->AddMode(jf, 'j');
 183         }
 184
 185         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname)
 186         {
 187                 if (chan)
 188                 {
 189                         joinfloodsettings *f;
 190                         if (chan->GetExt("joinflood", f))
 191                         {
 192                                 if (f->islocked())
 193                                 {
 194                                         WriteServ(user->fd,"609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 195                                         return 1;
 196                                 }
 197                         }
 198                 }
 199                 return 0;
 200         }
 201
 202         virtual void OnUserJoin(userrec* user, chanrec* channel)
 203         {
 204                 joinfloodsettings *f;
 205                 if (channel->GetExt("joinflood",f))
 206                 {
 207                         f->addjoin();
 208                         if (f->shouldlock())
 209                         {
 210                                 f->clear();
 211                                 f->lock();
 212                                 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);
 213                         }
 214                 }
 215         }
 216
 217         void OnChannelDelete(chanrec* chan)
 218         {
 219                 joinfloodsettings *f;
 220                 if (chan->GetExt("joinflood",f))
 221                 {
 222                         DELETE(f);
 223                         chan->Shrink("joinflood");
 224                 }
 225         }
 226
 227         void Implements(char* List)
 228         {
 229                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 230         }
 231
 232         virtual void On005Numeric(std::string &output)
 233         {
 234                 InsertMode(output, "j", 3);
 235         }
 236
 237         virtual ~ModuleJoinFlood()
 238         {
 239                 DELETE(jf);
 240         }
 241
 242         virtual Version GetVersion()
 243         {
 244                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 245         }
 246 };
 247
 248
 249 class ModuleJoinFloodFactory : public ModuleFactory
 250 {
 251  public:
 252         ModuleJoinFloodFactory()
 253         {
 254         }
 255
 256         ~ModuleJoinFloodFactory()
 257         {
 258         }
 259
 260         virtual Module * CreateModule(Server* Me)
 261         {
 262                 return new ModuleJoinFlood(Me);
 263         }
 264
 265 };
 266
 267
 268 extern "C" void * init_module( void )
 269 {
 270         return new ModuleJoinFloodFactory;
 271 }
 272