src/modules/m_messageflood.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 /* $ModDesc: Provides channel mode +f (message flood protection) */
  17
  18 /** Holds flood settings and state for mode +f
  19  */
  20 class floodsettings : public classbase
  21 {
  22  private:
  23         InspIRCd *ServerInstance;
  24  public:
  25         bool ban;
  26         int secs;
  27         int lines;
  28         time_t reset;
  29         std::map<User*,int> counters;
  30
  31         floodsettings(InspIRCd *Instance, bool a, int b, int c) : ServerInstance(Instance), ban(a), secs(b), lines(c)
  32         {
  33                 reset = ServerInstance->Time() + secs;
  34         };
  35
  36         void addmessage(User* who)
  37         {
  38                 std::map<User*,int>::iterator iter = counters.find(who);
  39                 if (iter != counters.end())
  40                 {
  41                         iter->second++;
  42                 }
  43                 else
  44                 {
  45                         counters[who] = 1;
  46                 }
  47                 if (ServerInstance->Time() > reset)
  48                 {
  49                         counters.clear();
  50                         reset = ServerInstance->Time() + secs;
  51                 }
  52         }
  53
  54         bool shouldkick(User* who)
  55         {
  56                 std::map<User*,int>::iterator iter = counters.find(who);
  57                 if (iter != counters.end())
  58                 {
  59                         return (iter->second >= this->lines);
  60                 }
  61                 else return false;
  62         }
  63
  64         void clear(User* who)
  65         {
  66                 std::map<User*,int>::iterator iter = counters.find(who);
  67                 if (iter != counters.end())
  68                 {
  69                         counters.erase(iter);
  70                 }
  71         }
  72 };
  73
  74 /** Handles channel mode +f
  75  */
  76 class MsgFlood : public ModeHandler
  77 {
  78  public:
  79         MsgFlood(InspIRCd* Instance, Module* Creator) : ModeHandler(Instance, Creator, 'f', 1, 0, false, MODETYPE_CHANNEL, false) { }
  80
  81         ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string &parameter)
  82         {
  83                 floodsettings* x;
  84                 if (channel->GetExt("flood",x))
  85                         return std::make_pair(true, (x->ban ? "*" : "")+ConvToStr(x->lines)+":"+ConvToStr(x->secs));
  86                 else
  87                         return std::make_pair(false, parameter);
  88         }
  89
  90         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
  91         {
  92                 floodsettings *f;
  93
  94                 if (adding)
  95                 {
  96                         char ndata[MAXBUF];
  97                         char* data = ndata;
  98                         strlcpy(ndata,parameter.c_str(),MAXBUF);
  99                         char* lines = data;
 100                         char* secs = NULL;
 101                         bool ban = false;
 102                         if (*data == '*')
 103                         {
 104                                 ban = true;
 105                                 lines++;
 106                         }
 107                         else
 108                         {
 109                                 ban = false;
 110                         }
 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 nlines = atoi(lines);
 126                                 int nsecs = atoi(secs);
 127                                 if ((nlines<2) || (nsecs<1))
 128                                 {
 129                                         source->WriteNumeric(608, "%s %s :Invalid flood parameter",source->nick.c_str(),channel->name.c_str());
 130                                         parameter.clear();
 131                                         return MODEACTION_DENY;
 132                                 }
 133                                 else
 134                                 {
 135                                         if (!channel->GetExt("flood", f))
 136                                         {
 137                                                 parameter = std::string(ban ? "*" : "") + ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 138                                                 floodsettings *fs = new floodsettings(ServerInstance,ban,nsecs,nlines);
 139                                                 channel->Extend("flood",fs);
 140                                                 channel->SetModeParam('f', parameter);
 141                                                 return MODEACTION_ALLOW;
 142                                         }
 143                                         else
 144                                         {
 145                                                 std::string cur_param = channel->GetModeParameter('f');
 146                                                 parameter = std::string(ban ? "*" : "") + ConvToStr(nlines) + ":" +ConvToStr(nsecs);
 147                                                 if (cur_param == parameter)
 148                                                 {
 149                                                         // mode params match
 150                                                         return MODEACTION_DENY;
 151                                                 }
 152                                                 else
 153                                                 {
 154                                                         if ((((nlines != f->lines) || (nsecs != f->secs) || (ban != f->ban))) && (((nsecs > 0) && (nlines > 0))))
 155                                                         {
 156                                                                 delete f;
 157                                                                 floodsettings *fs = new floodsettings(ServerInstance,ban,nsecs,nlines);
 158                                                                 channel->Shrink("flood");
 159                                                                 channel->Extend("flood",fs);
 160                                                                 channel->SetModeParam('f', parameter);
 161                                                                 return MODEACTION_ALLOW;
 162                                                         }
 163                                                         else
 164                                                         {
 165                                                                 return MODEACTION_DENY;
 166                                                         }
 167                                                 }
 168                                         }
 169                                 }
 170                         }
 171                         else
 172                         {
 173                                 source->WriteNumeric(608, "%s %s :Invalid flood parameter",source->nick.c_str(),channel->name.c_str());
 174                                 parameter.clear();
 175                                 return MODEACTION_DENY;
 176                         }
 177                 }
 178                 else
 179                 {
 180                         if (channel->GetExt("flood", f))
 181                         {
 182                                 delete f;
 183                                 channel->Shrink("flood");
 184                                 channel->SetModeParam('f', "");
 185                                 return MODEACTION_ALLOW;
 186                         }
 187                 }
 188
 189                 return MODEACTION_DENY;
 190         }
 191 };
 192
 193 class ModuleMsgFlood : public Module
 194 {
 195         MsgFlood mf;
 196
 197  public:
 198
 199         ModuleMsgFlood(InspIRCd* Me)
 200                 : Module(Me), mf(Me, this)
 201         {
 202                 if (!ServerInstance->Modes->AddMode(&mf))
 203                         throw ModuleException("Could not add new modes!");
 204                 Implementation eventlist[] = { I_OnChannelDelete, I_OnUserPreNotice, I_OnUserPreMessage };
 205                 ServerInstance->Modules->Attach(eventlist, this, 3);
 206         }
 207
 208         int ProcessMessages(User* user,Channel* dest, const std::string &text)
 209         {
 210                 if (!IS_LOCAL(user) || (CHANOPS_EXEMPT(ServerInstance, 'f') && dest->GetStatus(user) == STATUS_OP))
 211                 {
 212                         return 0;
 213                 }
 214
 215                 floodsettings *f;
 216                 if (dest->GetExt("flood", f))
 217                 {
 218                         f->addmessage(user);
 219                         if (f->shouldkick(user))
 220                         {
 221                                 /* Youre outttta here! */
 222                                 f->clear(user);
 223                                 if (f->ban)
 224                                 {
 225                                         std::vector<std::string> parameters;
 226                                         parameters.push_back(dest->name);
 227                                         parameters.push_back("+b");
 228                                         parameters.push_back(user->MakeWildHost());
 229                                         ServerInstance->SendMode(parameters, ServerInstance->FakeClient);
 230
 231                                         ServerInstance->PI->SendModeStr(dest->name, std::string("+b ") + user->MakeWildHost());
 232                                 }
 233
 234                                 char kickmessage[MAXBUF];
 235                                 snprintf(kickmessage, MAXBUF, "Channel flood triggered (limit is %d lines in %d secs)", f->lines, f->secs);
 236
 237                                 if (!dest->ServerKickUser(user, kickmessage))
 238                                 {
 239                                         delete dest;
 240                                 }
 241
 242                                 return 1;
 243                         }
 244                 }
 245
 246                 return 0;
 247         }
 248
 249         virtual int OnUserPreMessage(User *user, void *dest, int target_type, std::string &text, char status, CUList &exempt_list)
 250         {
 251                 if (target_type == TYPE_CHANNEL)
 252                         return ProcessMessages(user,(Channel*)dest,text);
 253
 254                 return 0;
 255         }
 256
 257         virtual int OnUserPreNotice(User *user, void *dest, int target_type, std::string &text, char status, CUList &exempt_list)
 258         {
 259                 if (target_type == TYPE_CHANNEL)
 260                         return ProcessMessages(user,(Channel*)dest,text);
 261
 262                 return 0;
 263         }
 264
 265         void OnChannelDelete(Channel* chan)
 266         {
 267                 floodsettings* f;
 268                 if (chan->GetExt("flood", f))
 269                 {
 270                         delete f;
 271                         chan->Shrink("flood");
 272                 }
 273         }
 274
 275
 276         virtual ~ModuleMsgFlood()
 277         {
 278                 ServerInstance->Modes->DelMode(&mf);
 279         }
 280
 281         virtual Version GetVersion()
 282         {
 283                 return Version("$Id$", VF_COMMON | VF_VENDOR, API_VERSION);
 284         }
 285 };
 286
 287 MODULE_INIT(ModuleMsgFlood)