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
  25 #include "configreader.h"
  26 #include "inspircd.h"
  27
  28 /* $ModDesc: Provides channel mode +j (join flood protection) */
  29
  30
  31
  32 class joinfloodsettings : public classbase
  33 {
  34  public:
  35
  36         int secs;
  37         int joins;
  38         time_t reset;
  39         time_t unlocktime;
  40         int counter;
  41         bool locked;
  42
  43         joinfloodsettings() : secs(0), joins(0) {};
  44         joinfloodsettings(int b, int c) : secs(b), joins(c)
  45         {
  46                 reset = time(NULL) + secs;
  47                 counter = 0;
  48                 locked = false;
  49         };
  50
  51         void addjoin()
  52         {
  53                 counter++;
  54                 if (time(NULL) > reset)
  55                 {
  56                         counter = 0;
  57                         reset = time(NULL) + secs;
  58                 }
  59         }
  60
  61         bool shouldlock()
  62         {
  63                 return (counter >= this->joins);
  64         }
  65
  66         void clear()
  67         {
  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                 locked = true;
  91                 unlocktime = time(NULL) + 60;
  92         }
  93
  94 };
  95
  96 class JoinFlood : public ModeHandler
  97 {
  98  public:
  99         JoinFlood(InspIRCd* Instance) : ModeHandler(Instance, 'j', 1, 0, false, MODETYPE_CHANNEL, false) { }
 100
 101         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 102         {
 103                 joinfloodsettings* x;
 104                 if (channel->GetExt("joinflood",x))
 105                         return std::make_pair(true, ConvToStr(x->joins)+":"+ConvToStr(x->secs));
 106                 else
 107                         return std::make_pair(false, parameter);
 108         }
 109
 110         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 111         {
 112                 /* When TS is equal, the alphabetically later one wins */
 113                 return (their_param < our_param);
 114         }
 115
 116         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 117         {
 118                 joinfloodsettings* dummy;
 119
 120                 if (adding)
 121                 {
 122                         char ndata[MAXBUF];
 123                         char* data = ndata;
 124                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 125                         char* joins = data;
 126                         char* secs = NULL;
 127                         while (*data)
 128                         {
 129                                 if (*data == ':')
 130                                 {
 131                                         *data = 0;
 132                                         data++;
 133                                         secs = data;
 134                                         break;
 135                                 }
 136                                 else data++;
 137                         }
 138                         if (secs)
 139                         {
 140                                 /* Set up the flood parameters for this channel */
 141                                 int njoins = atoi(joins);
 142                                 int nsecs = atoi(secs);
 143                                 if ((njoins<1) || (nsecs<1))
 144                                 {
 145                                         source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 146                                         parameter = "";
 147                                         return MODEACTION_DENY;
 148                                 }
 149                                 else
 150                                 {
 151                                         if (!channel->GetExt("joinflood", dummy))
 152                                         {
 153                                                 parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
 154                                                 joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
 155                                                 channel->Extend("joinflood", f);
 156                                                 channel->SetMode('j', true);
 157                                                 channel->SetModeParam('j', parameter.c_str(), true);
 158                                                 return MODEACTION_ALLOW;
 159                                         }
 160                                 }
 161                         }
 162                         else
 163                         {
 164                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 165                                 return MODEACTION_DENY;
 166                         }
 167                 }
 168                 else
 169                 {
 170                         if (channel->GetExt("joinflood", dummy))
 171                         {
 172                                 joinfloodsettings *f;
 173                                 channel->GetExt("joinflood", f);
 174                                 DELETE(f);
 175                                 channel->Shrink("joinflood");
 176                                 channel->SetMode('j', false);
 177                                 return MODEACTION_ALLOW;
 178                         }
 179                 }
 180                 return MODEACTION_DENY;
 181         }
 182 };
 183
 184 class ModuleJoinFlood : public Module
 185 {
 186
 187         JoinFlood* jf;
 188
 189  public:
 190
 191         ModuleJoinFlood(InspIRCd* Me)
 192                 : Module::Module(Me)
 193         {
 194
 195                 jf = new JoinFlood(ServerInstance);
 196                 ServerInstance->AddMode(jf, 'j');
 197         }
 198
 199         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname)
 200         {
 201                 if (chan)
 202                 {
 203                         joinfloodsettings *f;
 204                         if (chan->GetExt("joinflood", f))
 205                         {
 206                                 if (f->islocked())
 207                                 {
 208                                         user->WriteServ("609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 209                                         return 1;
 210                                 }
 211                         }
 212                 }
 213                 return 0;
 214         }
 215
 216         virtual void OnUserJoin(userrec* user, chanrec* channel)
 217         {
 218                 joinfloodsettings *f;
 219                 if (channel->GetExt("joinflood",f))
 220                 {
 221                         f->addjoin();
 222                         if (f->shouldlock())
 223                         {
 224                                 f->clear();
 225                                 f->lock();
 226                                 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);
 227                         }
 228                 }
 229         }
 230
 231         void OnChannelDelete(chanrec* chan)
 232         {
 233                 joinfloodsettings *f;
 234                 if (chan->GetExt("joinflood",f))
 235                 {
 236                         DELETE(f);
 237                         chan->Shrink("joinflood");
 238                 }
 239         }
 240
 241         void Implements(char* List)
 242         {
 243                 List[I_On005Numeric] = List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 244         }
 245
 246         virtual void On005Numeric(std::string &output)
 247         {
 248                 ServerInstance->Modes->InsertMode(output, "j", 3);
 249         }
 250
 251         virtual ~ModuleJoinFlood()
 252         {
 253                 DELETE(jf);
 254         }
 255
 256         virtual Version GetVersion()
 257         {
 258                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
 259         }
 260 };
 261
 262
 263 class ModuleJoinFloodFactory : public ModuleFactory
 264 {
 265  public:
 266         ModuleJoinFloodFactory()
 267         {
 268         }
 269
 270         ~ModuleJoinFloodFactory()
 271         {
 272         }
 273
 274         virtual Module * CreateModule(InspIRCd* Me)
 275         {
 276                 return new ModuleJoinFlood(Me);
 277         }
 278
 279 };
 280
 281
 282 extern "C" void * init_module( void )
 283 {
 284         return new ModuleJoinFloodFactory;
 285 }
 286