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 "configreader.h"
  25 #include "inspircd.h"
  26
  27 /* $ModDesc: Provides channel mode +j (join flood protection) */
  28
  29
  30
  31 class joinfloodsettings : public classbase
  32 {
  33  public:
  34
  35         int secs;
  36         int joins;
  37         time_t reset;
  38         time_t unlocktime;
  39         int counter;
  40         bool locked;
  41
  42         joinfloodsettings() : secs(0), joins(0) {};
  43         joinfloodsettings(int b, int c) : secs(b), joins(c)
  44         {
  45                 reset = time(NULL) + secs;
  46                 counter = 0;
  47                 locked = false;
  48         };
  49
  50         void addjoin()
  51         {
  52                 counter++;
  53                 if (time(NULL) > reset)
  54                 {
  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                 counter = 0;
  68         }
  69
  70         bool islocked()
  71         {
  72                 if (locked)
  73                 {
  74                         if (time(NULL) > unlocktime)
  75                         {
  76                                 locked = false;
  77                                 return false;
  78                         }
  79                         else
  80                         {
  81                                 return true;
  82                         }
  83                 }
  84                 return false;
  85         }
  86
  87         void lock()
  88         {
  89                 locked = true;
  90                 unlocktime = time(NULL) + 60;
  91         }
  92
  93 };
  94
  95 class JoinFlood : public ModeHandler
  96 {
  97  public:
  98         JoinFlood(InspIRCd* Instance) : ModeHandler(Instance, 'j', 1, 0, false, MODETYPE_CHANNEL, false) { }
  99
 100         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 101         {
 102                 joinfloodsettings* x;
 103                 if (channel->GetExt("joinflood",x))
 104                         return std::make_pair(true, ConvToStr(x->joins)+":"+ConvToStr(x->secs));
 105                 else
 106                         return std::make_pair(false, parameter);
 107         }
 108
 109         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 110         {
 111                 /* When TS is equal, the alphabetically later one wins */
 112                 return (their_param < our_param);
 113         }
 114
 115         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 116         {
 117                 joinfloodsettings* dummy;
 118
 119                 if (adding)
 120                 {
 121                         ServerInstance->Log(DEBUG,"Got parameter: '%s'",parameter.c_str());
 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                                         else
 161                                         {
 162                                                 std::string cur_param = channel->GetModeParameter('j');
 163                                                 parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
 164                                                 if (cur_param == parameter)
 165                                                 {
 166                                                         // mode params match
 167                                                         return MODEACTION_DENY;
 168                                                 }
 169                                                 else
 170                                                 {
 171                                                         // new mode param, replace old with new
 172                                                         if ((nsecs > 0) && (njoins > 0))
 173                                                         {
 174                                                                 joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
 175                                                                 channel->Shrink("joinflood");
 176                                                                 channel->Extend("joinflood", f);
 177                                                                 channel->SetModeParam('j', cur_param.c_str(), false);
 178                                                                 channel->SetModeParam('j', parameter.c_str(), true);
 179                                                                 return MODEACTION_ALLOW;
 180                                                         }
 181                                                         else
 182                                                         {
 183                                                                 return MODEACTION_DENY;
 184                                                         }
 185                                                 }
 186                                         }
 187                                 }
 188                         }
 189                         else
 190                         {
 191                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 192                                 return MODEACTION_DENY;
 193                         }
 194                 }
 195                 else
 196                 {
 197                         if (channel->GetExt("joinflood", dummy))
 198                         {
 199                                 joinfloodsettings *f;
 200                                 channel->GetExt("joinflood", f);
 201                                 DELETE(f);
 202                                 channel->Shrink("joinflood");
 203                                 channel->SetMode('j', false);
 204                                 return MODEACTION_ALLOW;
 205                         }
 206                 }
 207                 return MODEACTION_DENY;
 208         }
 209 };
 210
 211 class ModuleJoinFlood : public Module
 212 {
 213
 214         JoinFlood* jf;
 215
 216  public:
 217
 218         ModuleJoinFlood(InspIRCd* Me)
 219                 : Module::Module(Me)
 220         {
 221
 222                 jf = new JoinFlood(ServerInstance);
 223                 ServerInstance->AddMode(jf, 'j');
 224         }
 225
 226         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname)
 227         {
 228                 if (chan)
 229                 {
 230                         joinfloodsettings *f;
 231                         if (chan->GetExt("joinflood", f))
 232                         {
 233                                 if (f->islocked())
 234                                 {
 235                                         user->WriteServ("609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 236                                         return 1;
 237                                 }
 238                         }
 239                 }
 240                 return 0;
 241         }
 242
 243         virtual void OnUserJoin(userrec* user, chanrec* channel)
 244         {
 245                 joinfloodsettings *f;
 246                 if (channel->GetExt("joinflood",f))
 247                 {
 248                         f->addjoin();
 249                         if (f->shouldlock())
 250                         {
 251                                 f->clear();
 252                                 f->lock();
 253                                 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);
 254                         }
 255                 }
 256         }
 257
 258         void OnChannelDelete(chanrec* chan)
 259         {
 260                 joinfloodsettings *f;
 261                 if (chan->GetExt("joinflood",f))
 262                 {
 263                         DELETE(f);
 264                         chan->Shrink("joinflood");
 265                 }
 266         }
 267
 268         void Implements(char* List)
 269         {
 270                 List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 271         }
 272
 273         virtual ~ModuleJoinFlood()
 274         {
 275                 ServerInstance->Modes->DelMode(jf);
 276                 DELETE(jf);
 277         }
 278
 279         virtual Version GetVersion()
 280         {
 281                 return Version(1, 0, 0, 0, VF_COMMON | VF_VENDOR);
 282         }
 283 };
 284
 285
 286 class ModuleJoinFloodFactory : public ModuleFactory
 287 {
 288  public:
 289         ModuleJoinFloodFactory()
 290         {
 291         }
 292
 293         ~ModuleJoinFloodFactory()
 294         {
 295         }
 296
 297         virtual Module * CreateModule(InspIRCd* Me)
 298         {
 299                 return new ModuleJoinFlood(Me);
 300         }
 301
 302 };
 303
 304
 305 extern "C" void * init_module( void )
 306 {
 307         return new ModuleJoinFloodFactory;
 308 }
 309