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                                                 joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
 138                                                 channel->Extend("joinflood",(char*)f);
 139                                                 return MODEACTION_ALLOW;
 140                                         }
 141                                 }
 142                         }
 143                         else
 144                         {
 145                                 WriteServ(source->fd,"608 %s %s :Invalid flood parameter",source->nick,channel->name);
 146                                 return MODEACTION_DENY;
 147                         }
 148                 }
 149                 else
 150                 {
 151                         if (channel->GetExt("joinflood"))
 152                         {
 153                                 joinfloodsettings *f = (joinfloodsettings*)channel->GetExt("joinflood");
 154                                 DELETE(f);
 155                                 channel->Shrink("joinflood");
 156                                 return MODEACTION_ALLOW;
 157                         }
 158                 }
 159                 return MODEACTION_DENY;
 160         }
 161 };
 162
 163 class ModuleJoinFlood : public Module
 164 {
 165         Server *Srv;
 166         JoinFlood* jf;
 167
 168  public:
 169
 170         ModuleJoinFlood(Server* Me)
 171                 : Module::Module(Me)
 172         {
 173                 Srv = Me;
 174                 jf = new JoinFlood();
 175                 Srv->AddMode(jf, 'j');
 176         }
 177
 178         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname)
 179         {
 180                 if (chan)
 181                 {
 182                         joinfloodsettings *f = (joinfloodsettings*)chan->GetExt("joinflood");
 183                         if (f)
 184                         {
 185                                 if (f->islocked())
 186                                 {
 187                                         WriteServ(user->fd,"609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 188                                         return 1;
 189                                 }
 190                         }
 191                 }
 192                 return 0;
 193         }
 194
 195         virtual void OnUserJoin(userrec* user, chanrec* channel)
 196         {
 197                 joinfloodsettings *f = (joinfloodsettings*)channel->GetExt("joinflood");
 198                 if (f)
 199                 {
 200                         f->addjoin();
 201                         if (f->shouldlock())
 202                         {
 203                                 f->clear();
 204                                 f->lock();
 205                                 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);
 206                         }
 207                 }
 208         }
 209
 210         void OnChannelDelete(chanrec* chan)
 211         {
 212                 if (chan->GetExt("joinflood"))
 213                 {
 214                         joinfloodsettings *f = (joinfloodsettings*)chan->GetExt("joinflood");
 215                         DELETE(f);
 216                         chan->Shrink("joinflood");
 217                 }
 218         }
 219
 220         void Implements(char* List)
 221         {
 222                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 223         }
 224
 225         virtual void On005Numeric(std::string &output)
 226         {
 227                 InsertMode(output, "j", 3);
 228         }
 229
 230         virtual ~ModuleJoinFlood()
 231         {
 232                 DELETE(jf);
 233         }
 234
 235         virtual Version GetVersion()
 236         {
 237                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 238         }
 239 };
 240
 241
 242 class ModuleJoinFloodFactory : public ModuleFactory
 243 {
 244  public:
 245         ModuleJoinFloodFactory()
 246         {
 247         }
 248
 249         ~ModuleJoinFloodFactory()
 250         {
 251         }
 252
 253         virtual Module * CreateModule(Server* Me)
 254         {
 255                 return new ModuleJoinFlood(Me);
 256         }
 257
 258 };
 259
 260
 261 extern "C" void * init_module( void )
 262 {
 263         return new ModuleJoinFloodFactory;
 264 }
 265