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 +f (message 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                 if (time(NULL) > reset)
  52                 {
  53                         counter = 0;
  54                         reset = time(NULL) + secs;
  55                 }
  56         }
  57
  58         bool shouldlock()
  59         {
  60                 return (counter >= this->joins);
  61         }
  62
  63         void clear()
  64         {
  65                 counter = 0;
  66         }
  67
  68         bool islocked()
  69         {
  70                 if (locked)
  71                 {
  72                         if (time(NULL) > unlocktime)
  73                         {
  74                                 locked = false;
  75                                 return false;
  76                         }
  77                         else
  78                         {
  79                                 return true;
  80                         }
  81                 }
  82                 return false;
  83         }
  84
  85         void lock()
  86         {
  87                 locked = true;
  88                 unlocktime = time(NULL) + 60;
  89         }
  90
  91
  92 };
  93
  94 class ModuleJoinFlood : public Module
  95 {
  96         Server *Srv;
  97
  98  public:
  99
 100         ModuleJoinFlood(Server* Me)
 101                 : Module::Module(Me)
 102         {
 103                 Srv = Me;
 104                 Srv->AddExtendedMode('j',MT_CHANNEL,false,1,0);
 105         }
 106
 107         virtual int OnExtendedMode(userrec* user, void* target, char modechar, int type, bool mode_on, string_list &params)
 108         {
 109                 if ((modechar == 'j') && (type == MT_CHANNEL))
 110                 {
 111                         if (mode_on)
 112                         {
 113                                 std::string FloodParams = params[0];
 114                                 chanrec* c = (chanrec*)target;
 115                                 char ndata[MAXBUF];
 116                                 char* data = ndata;
 117                                 strlcpy(ndata,FloodParams.c_str(),MAXBUF);
 118                                 char* joins = data;
 119                                 char* secs = NULL;
 120                                 while (*data)
 121                                 {
 122                                         if (*data == ':')
 123                                         {
 124                                                 *data = 0;
 125                                                 data++;
 126                                                 secs = data;
 127                                                 break;
 128                                         }
 129                                         else data++;
 130                                 }
 131                                 if (secs)
 132                                 {
 133                                         /* Set up the flood parameters for this channel */
 134                                         int njoins = atoi(joins);
 135                                         int nsecs = atoi(secs);
 136                                         if ((njoins<1) || (nsecs<1))
 137                                         {
 138                                                 WriteServ(user->fd,"608 %s %s :Invalid flood parameter",user->nick,c->name);
 139                                                 return 0;
 140                                         }
 141                                         else
 142                                         {
 143                                                 if (!c->GetExt("joinflood"))
 144                                                 {
 145                                                         joinfloodsettings *f = new joinfloodsettings(njoins,nsecs);
 146                                                         c->Extend("joinflood",(char*)f);
 147                                                 }
 148                                         }
 149                                         return 1;
 150                                 }
 151                                 else
 152                                 {
 153                                         WriteServ(user->fd,"608 %s %s :Invalid flood parameter",user->nick,c->name);
 154                                         return 0;
 155                                 }
 156
 157                         }
 158                         else
 159                         {
 160                                 chanrec* c = (chanrec*)target;
 161                                 if (c->GetExt("joinflood"))
 162                                 {
 163                                         joinfloodsettings *f = (joinfloodsettings*)c->GetExt("joinflood");
 164                                         delete f;
 165                                         c->Shrink("joinflood");
 166                                 }
 167                         }
 168                         return 1;
 169                 }
 170                 return 0;
 171         }
 172
 173         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname)
 174         {
 175                 if (chan)
 176                 {
 177                         joinfloodsettings *f = (joinfloodsettings*)chan->GetExt("joinflood");
 178                         if (f)
 179                         {
 180                                 if (f->islocked())
 181                                 {
 182                                         WriteServ(user->fd,"609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 183                                         return 1;
 184                                 }
 185                         }
 186                 }
 187                 return 0;
 188         }
 189
 190         virtual void OnUserJoin(userrec* user, chanrec* channel)
 191         {
 192                 joinfloodsettings *f = (joinfloodsettings*)channel->GetExt("joinflood");
 193                 if (f)
 194                 {
 195                         f->addjoin();
 196                         if (f->shouldlock())
 197                         {
 198                                 f->clear();
 199                                 f->lock();
 200                                 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);
 201                         }
 202                 }
 203         }
 204
 205         void OnChannelDelete(chanrec* chan)
 206         {
 207                 if (chan->GetExt("joinflood"))
 208                 {
 209                         joinfloodsettings *f = (joinfloodsettings*)chan->GetExt("joinflood");
 210                         delete f;
 211                         chan->Shrink("joinflood");
 212                 }
 213         }
 214
 215         void Implements(char* List)
 216         {
 217                 List[I_On005Numeric] = List[I_OnExtendedMode] = List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 218         }
 219
 220         virtual void On005Numeric(std::string &output)
 221         {
 222                 std::stringstream line(output);
 223                 std::string temp1, temp2;
 224                 while (!line.eof())
 225                 {
 226                         line >> temp1;
 227                         if (temp1.substr(0,10) == "CHANMODES=")
 228                         {
 229                                 // By doing this we're *assuming* no other module has fucked up the CHANMODES=
 230                                 // section of the 005 numeric. If they have, we're going DOWN in a blaze of glory,
 231                                 // with a honking great EXCEPTION :)
 232                                 temp1.insert(temp1.find(",")+1,"j");
 233                         }
 234                         temp2 = temp2 + temp1 + " ";
 235                 }
 236                 if (temp2.length())
 237                         output = temp2.substr(0,temp2.length()-1);
 238         }
 239
 240         virtual ~ModuleJoinFlood()
 241         {
 242         }
 243
 244         virtual Version GetVersion()
 245         {
 246                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 247         }
 248 };
 249
 250
 251 class ModuleJoinFloodFactory : public ModuleFactory
 252 {
 253  public:
 254         ModuleJoinFloodFactory()
 255         {
 256         }
 257
 258         ~ModuleJoinFloodFactory()
 259         {
 260         }
 261
 262         virtual Module * CreateModule(Server* Me)
 263         {
 264                 return new ModuleJoinFlood(Me);
 265         }
 266
 267 };
 268
 269
 270 extern "C" void * init_module( void )
 271 {
 272         return new ModuleJoinFloodFactory;
 273 }
 274