src/modules/m_joinflood.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include <stdio.h>
  15 #include <map>
  16 #include "users.h"
  17 #include "channels.h"
  18 #include "modules.h"
  19 #include "configreader.h"
  20 #include "inspircd.h"
  21
  22 /* $ModDesc: Provides channel mode +j (join flood protection) */
  23
  24 /** Holds settings and state associated with channel mode +j
  25  */
  26 class joinfloodsettings : public classbase
  27 {
  28  public:
  29
  30         int secs;
  31         int joins;
  32         time_t reset;
  33         time_t unlocktime;
  34         int counter;
  35         bool locked;
  36     InspIRCd* ServerInstance;
  37
  38         joinfloodsettings() : secs(0), joins(0) {};
  39
  40         joinfloodsettings(int b, int c) : secs(b), joins(c)
  41         {
  42                 reset = time(NULL) + secs;
  43                 counter = 0;
  44                 locked = false;
  45         };
  46
  47         void addjoin()
  48         {
  49                 counter++;
  50                 if (time(NULL) > reset)
  51                 {
  52                         counter = 0;
  53                         reset = time(NULL) + secs;
  54                 }
  55         }
  56
  57         bool shouldlock()
  58         {
  59                 return (counter >= this->joins);
  60         }
  61
  62         void clear()
  63         {
  64                 counter = 0;
  65         }
  66
  67         bool islocked()
  68         {
  69                 if (locked)
  70                 {
  71                         if (time(NULL) > unlocktime)
  72                         {
  73                                 locked = false;
  74                                 return false;
  75                         }
  76                         else
  77                         {
  78                                 return true;
  79                         }
  80                 }
  81                 return false;
  82         }
  83
  84         void lock()
  85         {
  86                 locked = true;
  87                 unlocktime = time(NULL) + 60;
  88         }
  89
  90 };
  91
  92 /** Handles channel mode +j
  93  */
  94 class JoinFlood : public ModeHandler
  95 {
  96  public:
  97         JoinFlood(InspIRCd* Instance) : ModeHandler(Instance, 'j', 1, 0, false, MODETYPE_CHANNEL, false) { }
  98
  99         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 100         {
 101                 joinfloodsettings* x;
 102                 if (channel->GetExt("joinflood",x))
 103                         return std::make_pair(true, ConvToStr(x->joins)+":"+ConvToStr(x->secs));
 104                 else
 105                         return std::make_pair(false, parameter);
 106         }
 107
 108         bool CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 109         {
 110                 /* When TS is equal, the alphabetically later one wins */
 111                 return (their_param < our_param);
 112         }
 113
 114         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 115         {
 116                 joinfloodsettings* dummy;
 117
 118                 if (adding)
 119                 {
 120                         char ndata[MAXBUF];
 121                         char* data = ndata;
 122                         strlcpy(ndata,parameter.c_str(),MAXBUF);
 123                         char* joins = data;
 124                         char* secs = NULL;
 125                         while (*data)
 126                         {
 127                                 if (*data == ':')
 128                                 {
 129                                         *data = 0;
 130                                         data++;
 131                                         secs = data;
 132                                         break;
 133                                 }
 134                                 else data++;
 135                         }
 136                         if (secs)
 137
 138                         {
 139                                 /* Set up the flood parameters for this channel */
 140                                 int njoins = atoi(joins);
 141                                 int nsecs = atoi(secs);
 142                                 if ((njoins<1) || (nsecs<1))
 143                                 {
 144                                         source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 145                                         parameter = "";
 146                                         return MODEACTION_DENY;
 147                                 }
 148                                 else
 149                                 {
 150                                         if (!channel->GetExt("joinflood", dummy))
 151                                         {
 152                                                 parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
 153                                                 joinfloodsettings *f = new joinfloodsettings(nsecs,njoins);
 154                                                 channel->Extend("joinflood", f);
 155                                                 channel->SetMode('j', true);
 156                                                 channel->SetModeParam('j', parameter.c_str(), true);
 157                                                 return MODEACTION_ALLOW;
 158                                         }
 159                                         else
 160                                         {
 161                                                 std::string cur_param = channel->GetModeParameter('j');
 162                                                 parameter = ConvToStr(njoins) + ":" +ConvToStr(nsecs);
 163                                                 if (cur_param == parameter)
 164                                                 {
 165                                                         // mode params match
 166                                                         return MODEACTION_DENY;
 167                                                 }
 168                                                 else
 169                                                 {
 170                                                         // new mode param, replace old with new
 171                                                         if ((nsecs > 0) && (njoins > 0))
 172                                                         {
 173                                                                 joinfloodsettings* f;
 174                                                                 channel->GetExt("joinflood", f);
 175                                                                 delete f;
 176                                                                 f = new joinfloodsettings(nsecs,njoins);
 177                                                                 channel->Shrink("joinflood");
 178                                                                 channel->Extend("joinflood", f);
 179                                                                 channel->SetModeParam('j', cur_param.c_str(), false);
 180                                                                 channel->SetModeParam('j', parameter.c_str(), true);
 181                                                                 return MODEACTION_ALLOW;
 182                                                         }
 183                                                         else
 184                                                         {
 185                                                                 return MODEACTION_DENY;
 186                                                         }
 187                                                 }
 188                                         }
 189                                 }
 190                         }
 191                         else
 192                         {
 193                                 source->WriteServ("608 %s %s :Invalid flood parameter",source->nick,channel->name);
 194                                 return MODEACTION_DENY;
 195                         }
 196                 }
 197                 else
 198                 {
 199                         if (channel->GetExt("joinflood", dummy))
 200                         {
 201                                 joinfloodsettings *f;
 202                                 channel->GetExt("joinflood", f);
 203                                 DELETE(f);
 204                                 channel->Shrink("joinflood");
 205                                 channel->SetMode('j', false);
 206                                 return MODEACTION_ALLOW;
 207                         }
 208                 }
 209                 return MODEACTION_DENY;
 210         }
 211 };
 212
 213 class ModuleJoinFlood : public Module
 214 {
 215
 216         JoinFlood* jf;
 217
 218  public:
 219
 220         ModuleJoinFlood(InspIRCd* Me)
 221                 : Module(Me)
 222         {
 223
 224                 jf = new JoinFlood(ServerInstance);
 225                 if (!ServerInstance->AddMode(jf, 'j'))
 226                         throw ModuleException("Could not add new modes!");
 227         }
 228
 229         virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname, std::string &privs)
 230         {
 231                 if (chan)
 232                 {
 233                         joinfloodsettings *f;
 234                         if (chan->GetExt("joinflood", f))
 235                         {
 236                                 if (f->islocked())
 237                                 {
 238                                         user->WriteServ("609 %s %s :This channel is temporarily unavailable (+j). Please try again later.",user->nick,chan->name);
 239                                         return 1;
 240                                 }
 241                         }
 242                 }
 243                 return 0;
 244         }
 245
 246         virtual void OnUserJoin(userrec* user, chanrec* channel, bool &silent)
 247         {
 248                 joinfloodsettings *f;
 249                 if (channel->GetExt("joinflood",f))
 250                 {
 251                         f->addjoin();
 252                         if (f->shouldlock())
 253                         {
 254                                 f->clear();
 255                                 f->lock();
 256                                 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);
 257                         }
 258                 }
 259         }
 260
 261         void OnChannelDelete(chanrec* chan)
 262         {
 263                 joinfloodsettings *f;
 264                 if (chan->GetExt("joinflood",f))
 265                 {
 266                         DELETE(f);
 267                         chan->Shrink("joinflood");
 268                 }
 269         }
 270
 271         void Implements(char* List)
 272         {
 273                 List[I_OnChannelDelete] = List[I_OnUserPreJoin] = List[I_OnUserJoin] = 1;
 274         }
 275
 276         virtual ~ModuleJoinFlood()
 277         {
 278                 ServerInstance->Modes->DelMode(jf);
 279                 DELETE(jf);
 280         }
 281
 282         virtual Version GetVersion()
 283         {
 284                 return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 285         }
 286 };
 287
 288
 289 class ModuleJoinFloodFactory : public ModuleFactory
 290 {
 291  public:
 292         ModuleJoinFloodFactory()
 293         {
 294         }
 295
 296         ~ModuleJoinFloodFactory()
 297         {
 298         }
 299
 300         virtual Module * CreateModule(InspIRCd* Me)
 301         {
 302                 return new ModuleJoinFlood(Me);
 303         }
 304
 305 };
 306
 307
 308 extern "C" DllExport void * init_module( void )
 309 {
 310         return new ModuleJoinFloodFactory;
 311 }
 312